From d3849fd82ececd435ed97b5bb5775bc3c7fcc0eb Mon Sep 17 00:00:00 2001
From: Thiago Macieira <thiago.macieira@intel.com>
Date: Fri, 16 Mar 2012 01:27:57 +0100
Subject: [PATCH] Don't build mdnssd
This was enabled for Linux only, but Linux users should use Avahi,
which is present on most modern distributions, and implements mDNS
functionality.
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@nokia.com>
(cherry picked from commit 272e9a37f38896e899ce46355abcdd412fc247bc)
Change-Id: I5e17ff9b8bff6eae9af2f8281937afdb687c371f
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>
---
src/tools/mdnssd/DNSCommon.c | 3153 --------
src/tools/mdnssd/DNSCommon.h | 292 -
src/tools/mdnssd/DNSDigest.c | 1584 ----
src/tools/mdnssd/DebugServices.h | 1607 ----
src/tools/mdnssd/GenLinkedList.c | 319 -
src/tools/mdnssd/GenLinkedList.h | 90 -
src/tools/mdnssd/PlatformCommon.c | 196 -
src/tools/mdnssd/PlatformCommon.h | 18 -
src/tools/mdnssd/PosixDaemon.c | 258 -
src/tools/mdnssd/dns_sd.h | 2434 ------
src/tools/mdnssd/dnssd_ipc.c | 161 -
src/tools/mdnssd/dnssd_ipc.h | 217 -
src/tools/mdnssd/mDNS.c | 11521 ---------------------------
src/tools/mdnssd/mDNSDebug.c | 93 -
src/tools/mdnssd/mDNSDebug.h | 164 -
src/tools/mdnssd/mDNSEmbeddedAPI.h | 2964 -------
src/tools/mdnssd/mDNSPosix.c | 1621 ----
src/tools/mdnssd/mDNSPosix.h | 85 -
src/tools/mdnssd/mDNSUNP.c | 719 --
src/tools/mdnssd/mDNSUNP.h | 130 -
src/tools/mdnssd/mdnssd.pro | 59 -
src/tools/mdnssd/uDNS.c | 4927 ------------
src/tools/mdnssd/uDNS.h | 136 -
src/tools/mdnssd/uds_daemon.c | 4716 -----------
src/tools/mdnssd/uds_daemon.h | 80 -
src/tools/tools.pro | 4 -
26 files changed, 37548 deletions(-)
delete mode 100644 src/tools/mdnssd/DNSCommon.c
delete mode 100644 src/tools/mdnssd/DNSCommon.h
delete mode 100644 src/tools/mdnssd/DNSDigest.c
delete mode 100644 src/tools/mdnssd/DebugServices.h
delete mode 100644 src/tools/mdnssd/GenLinkedList.c
delete mode 100644 src/tools/mdnssd/GenLinkedList.h
delete mode 100644 src/tools/mdnssd/PlatformCommon.c
delete mode 100644 src/tools/mdnssd/PlatformCommon.h
delete mode 100644 src/tools/mdnssd/PosixDaemon.c
delete mode 100644 src/tools/mdnssd/dns_sd.h
delete mode 100644 src/tools/mdnssd/dnssd_ipc.c
delete mode 100644 src/tools/mdnssd/dnssd_ipc.h
delete mode 100644 src/tools/mdnssd/mDNS.c
delete mode 100644 src/tools/mdnssd/mDNSDebug.c
delete mode 100755 src/tools/mdnssd/mDNSDebug.h
delete mode 100755 src/tools/mdnssd/mDNSEmbeddedAPI.h
delete mode 100755 src/tools/mdnssd/mDNSPosix.c
delete mode 100755 src/tools/mdnssd/mDNSPosix.h
delete mode 100755 src/tools/mdnssd/mDNSUNP.c
delete mode 100755 src/tools/mdnssd/mDNSUNP.h
delete mode 100644 src/tools/mdnssd/mdnssd.pro
delete mode 100755 src/tools/mdnssd/uDNS.c
delete mode 100755 src/tools/mdnssd/uDNS.h
delete mode 100644 src/tools/mdnssd/uds_daemon.c
delete mode 100644 src/tools/mdnssd/uds_daemon.h
diff --git a/src/tools/mdnssd/DNSCommon.c b/src/tools/mdnssd/DNSCommon.c
deleted file mode 100644
index e5260683393..00000000000
--- a/src/tools/mdnssd/DNSCommon.c
+++ /dev/null
@@ -1,3153 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-// Set mDNS_InstantiateInlines to tell mDNSEmbeddedAPI.h to instantiate inline functions, if necessary
-#define mDNS_InstantiateInlines 1
-#include "DNSCommon.h"
-
-// Disable certain benign warnings with Microsoft compilers
-#if (defined(_MSC_VER))
- // Disable "conditional expression is constant" warning for debug macros.
- // Otherwise, this generates warnings for the perfectly natural construct "while(1)"
- // If someone knows a variant way of writing "while(1)" that doesn't generate warning messages, please let us know
- #pragma warning(disable:4127)
- // Disable "array is too small to include a terminating null character" warning
- // -- domain labels have an initial length byte, not a terminating null character
- #pragma warning(disable:4295)
-#endif
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark - Program Constants
-#endif
-
-mDNSexport const mDNSInterfaceID mDNSInterface_Any = 0;
-mDNSexport const mDNSInterfaceID mDNSInterfaceMark = (mDNSInterfaceID)-1;
-mDNSexport const mDNSInterfaceID mDNSInterface_LocalOnly = (mDNSInterfaceID)-2;
-mDNSexport const mDNSInterfaceID mDNSInterface_Unicast = (mDNSInterfaceID)-3;
-mDNSexport const mDNSInterfaceID mDNSInterface_P2P = (mDNSInterfaceID)-4;
-
-// Note: Microsoft's proposed "Link Local Multicast Name Resolution Protocol" (LLMNR) is essentially a limited version of
-// Multicast DNS, using the same packet formats, naming syntax, and record types as Multicast DNS, but on a different UDP
-// port and multicast address, which means it won't interoperate with the existing installed base of Multicast DNS responders.
-// LLMNR uses IPv4 multicast address 224.0.0.252, IPv6 multicast address FF02::0001:0003, and UDP port 5355.
-// Uncomment the appropriate lines below to build a special Multicast DNS responder for testing interoperability
-// with Microsoft's LLMNR client code.
-
-#define DiscardPortAsNumber 9
-#define SSHPortAsNumber 22
-#define UnicastDNSPortAsNumber 53
-#define SSDPPortAsNumber 1900
-#define IPSECPortAsNumber 4500
-#define NSIPCPortAsNumber 5030 // Port used for dnsextd to talk to local nameserver bound to loopback
-#define NATPMPAnnouncementPortAsNumber 5350
-#define NATPMPPortAsNumber 5351
-#define DNSEXTPortAsNumber 5352 // Port used for end-to-end DNS operations like LLQ, Updates with Leases, etc.
-#define MulticastDNSPortAsNumber 5353
-#define LoopbackIPCPortAsNumber 5354
-//#define MulticastDNSPortAsNumber 5355 // LLMNR
-#define PrivateDNSPortAsNumber 5533
-
-mDNSexport const mDNSIPPort DiscardPort = { { DiscardPortAsNumber >> 8, DiscardPortAsNumber & 0xFF } };
-mDNSexport const mDNSIPPort SSHPort = { { SSHPortAsNumber >> 8, SSHPortAsNumber & 0xFF } };
-mDNSexport const mDNSIPPort UnicastDNSPort = { { UnicastDNSPortAsNumber >> 8, UnicastDNSPortAsNumber & 0xFF } };
-mDNSexport const mDNSIPPort SSDPPort = { { SSDPPortAsNumber >> 8, SSDPPortAsNumber & 0xFF } };
-mDNSexport const mDNSIPPort IPSECPort = { { IPSECPortAsNumber >> 8, IPSECPortAsNumber & 0xFF } };
-mDNSexport const mDNSIPPort NSIPCPort = { { NSIPCPortAsNumber >> 8, NSIPCPortAsNumber & 0xFF } };
-mDNSexport const mDNSIPPort NATPMPAnnouncementPort = { { NATPMPAnnouncementPortAsNumber >> 8, NATPMPAnnouncementPortAsNumber & 0xFF } };
-mDNSexport const mDNSIPPort NATPMPPort = { { NATPMPPortAsNumber >> 8, NATPMPPortAsNumber & 0xFF } };
-mDNSexport const mDNSIPPort DNSEXTPort = { { DNSEXTPortAsNumber >> 8, DNSEXTPortAsNumber & 0xFF } };
-mDNSexport const mDNSIPPort MulticastDNSPort = { { MulticastDNSPortAsNumber >> 8, MulticastDNSPortAsNumber & 0xFF } };
-mDNSexport const mDNSIPPort LoopbackIPCPort = { { LoopbackIPCPortAsNumber >> 8, LoopbackIPCPortAsNumber & 0xFF } };
-mDNSexport const mDNSIPPort PrivateDNSPort = { { PrivateDNSPortAsNumber >> 8, PrivateDNSPortAsNumber & 0xFF } };
-
-mDNSexport const OwnerOptData zeroOwner = { 0, 0, { { 0 } }, { { 0 } }, { { 0 } } };
-
-mDNSexport const mDNSIPPort zeroIPPort = { { 0 } };
-mDNSexport const mDNSv4Addr zerov4Addr = { { 0 } };
-mDNSexport const mDNSv6Addr zerov6Addr = { { 0 } };
-mDNSexport const mDNSEthAddr zeroEthAddr = { { 0 } };
-mDNSexport const mDNSv4Addr onesIPv4Addr = { { 255, 255, 255, 255 } };
-mDNSexport const mDNSv6Addr onesIPv6Addr = { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 } };
-mDNSexport const mDNSEthAddr onesEthAddr = { { 255, 255, 255, 255, 255, 255 } };
-mDNSexport const mDNSAddr zeroAddr = { mDNSAddrType_None, {{{ 0 }}} };
-
-mDNSexport const mDNSv4Addr AllDNSAdminGroup = { { 239, 255, 255, 251 } };
-mDNSexport const mDNSv4Addr AllHosts_v4 = { { 224, 0, 0, 1 } }; // For NAT-PMP Annoucements
-mDNSexport const mDNSv6Addr AllHosts_v6 = { { 0xFF,0x02,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x01 } };
-mDNSexport const mDNSv6Addr NDP_prefix = { { 0xFF,0x02,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x01, 0xFF,0x00,0x00,0xFB } }; // FF02:0:0:0:0:1:FF00::/104
-mDNSexport const mDNSEthAddr AllHosts_v6_Eth = { { 0x33, 0x33, 0x00, 0x00, 0x00, 0x01 } };
-mDNSexport const mDNSAddr AllDNSLinkGroup_v4 = { mDNSAddrType_IPv4, { { { 224, 0, 0, 251 } } } };
-//mDNSexport const mDNSAddr AllDNSLinkGroup_v4 = { mDNSAddrType_IPv4, { { { 224, 0, 0, 252 } } } }; // LLMNR
-mDNSexport const mDNSAddr AllDNSLinkGroup_v6 = { mDNSAddrType_IPv6, { { { 0xFF,0x02,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0xFB } } } };
-//mDNSexport const mDNSAddr AllDNSLinkGroup_v6 = { mDNSAddrType_IPv6, { { { 0xFF,0x02,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x01,0x00,0x03 } } } }; // LLMNR
-
-mDNSexport const mDNSOpaque16 zeroID = { { 0, 0 } };
-mDNSexport const mDNSOpaque16 onesID = { { 255, 255 } };
-mDNSexport const mDNSOpaque16 QueryFlags = { { kDNSFlag0_QR_Query | kDNSFlag0_OP_StdQuery, 0 } };
-mDNSexport const mDNSOpaque16 uQueryFlags = { { kDNSFlag0_QR_Query | kDNSFlag0_OP_StdQuery | kDNSFlag0_RD, 0 } };
-mDNSexport const mDNSOpaque16 ResponseFlags = { { kDNSFlag0_QR_Response | kDNSFlag0_OP_StdQuery | kDNSFlag0_AA, 0 } };
-mDNSexport const mDNSOpaque16 UpdateReqFlags = { { kDNSFlag0_QR_Query | kDNSFlag0_OP_Update, 0 } };
-mDNSexport const mDNSOpaque16 UpdateRespFlags = { { kDNSFlag0_QR_Response | kDNSFlag0_OP_Update, 0 } };
-
-mDNSexport const mDNSOpaque64 zeroOpaque64 = { { 0 } };
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - General Utility Functions
-#endif
-
-// return true for RFC1918 private addresses
-mDNSexport mDNSBool mDNSv4AddrIsRFC1918(mDNSv4Addr *addr)
- {
- return ((addr->b[0] == 10) || // 10/8 prefix
- (addr->b[0] == 172 && (addr->b[1] & 0xF0) == 16) || // 172.16/12
- (addr->b[0] == 192 && addr->b[1] == 168)); // 192.168/16
- }
-
-mDNSexport NetworkInterfaceInfo *GetFirstActiveInterface(NetworkInterfaceInfo *intf)
- {
- while (intf && !intf->InterfaceActive) intf = intf->next;
- return(intf);
- }
-
-mDNSexport mDNSInterfaceID GetNextActiveInterfaceID(const NetworkInterfaceInfo *intf)
- {
- const NetworkInterfaceInfo *next = GetFirstActiveInterface(intf->next);
- if (next) return(next->InterfaceID); else return(mDNSNULL);
- }
-
-mDNSexport mDNSu32 NumCacheRecordsForInterfaceID(const mDNS *const m, mDNSInterfaceID id)
- {
- mDNSu32 slot, used = 0;
- CacheGroup *cg;
- const CacheRecord *rr;
- FORALL_CACHERECORDS(slot, cg, rr)
- if (rr->resrec.InterfaceID == id) used++;
- return(used);
- }
-
-mDNSexport char *DNSTypeName(mDNSu16 rrtype)
- {
- switch (rrtype)
- {
- case kDNSType_A: return("Addr");
- case kDNSType_NS: return("NS");
- case kDNSType_CNAME:return("CNAME");
- case kDNSType_SOA: return("SOA");
- case kDNSType_NULL: return("NULL");
- case kDNSType_PTR: return("PTR");
- case kDNSType_HINFO:return("HINFO");
- case kDNSType_TXT: return("TXT");
- case kDNSType_AAAA: return("AAAA");
- case kDNSType_SRV: return("SRV");
- case kDNSType_OPT: return("OPT");
- case kDNSType_NSEC: return("NSEC");
- case kDNSType_TSIG: return("TSIG");
- case kDNSQType_ANY: return("ANY");
- default: {
- static char buffer[16];
- mDNS_snprintf(buffer, sizeof(buffer), "(%d)", rrtype);
- return(buffer);
- }
- }
- }
-
-// Note slight bug: this code uses the rdlength from the ResourceRecord object, to display
-// the rdata from the RDataBody object. Sometimes this could be the wrong length -- but as
-// long as this routine is only used for debugging messages, it probably isn't a big problem.
-mDNSexport char *GetRRDisplayString_rdb(const ResourceRecord *const rr, const RDataBody *const rd1, char *const buffer)
- {
- const RDataBody2 *const rd = (RDataBody2 *)rd1;
- #define RemSpc (MaxMsg-1-length)
- char *ptr = buffer;
- mDNSu32 length = mDNS_snprintf(buffer, MaxMsg-1, "%4d %##s %s ", rr->rdlength, rr->name->c, DNSTypeName(rr->rrtype));
- if (rr->RecordType == kDNSRecordTypePacketNegative) return(buffer);
- if (!rr->rdlength) { mDNS_snprintf(buffer+length, RemSpc, "<< ZERO RDATA LENGTH >>"); return(buffer); }
-
- switch (rr->rrtype)
- {
- case kDNSType_A: mDNS_snprintf(buffer+length, RemSpc, "%.4a", &rd->ipv4); break;
-
- case kDNSType_NS: // Same as PTR
- case kDNSType_CNAME:// Same as PTR
- case kDNSType_PTR: mDNS_snprintf(buffer+length, RemSpc, "%##s", rd->name.c); break;
-
- case kDNSType_SOA: mDNS_snprintf(buffer+length, RemSpc, "%##s %##s %d %d %d %d %d",
- rd->soa.mname.c, rd->soa.rname.c,
- rd->soa.serial, rd->soa.refresh, rd->soa.retry, rd->soa.expire, rd->soa.min);
- break;
-
- case kDNSType_HINFO:// Display this the same as TXT (show all constituent strings)
- case kDNSType_TXT: {
- const mDNSu8 *t = rd->txt.c;
- while (t < rd->txt.c + rr->rdlength)
- {
- length += mDNS_snprintf(buffer+length, RemSpc, "%s%#s", t > rd->txt.c ? "|" : "", t);
- t += 1 + t[0];
- }
- } break;
-
- case kDNSType_AAAA: mDNS_snprintf(buffer+length, RemSpc, "%.16a", &rd->ipv6); break;
- case kDNSType_SRV: mDNS_snprintf(buffer+length, RemSpc, "%u %u %u %##s",
- rd->srv.priority, rd->srv.weight, mDNSVal16(rd->srv.port), rd->srv.target.c); break;
-
- case kDNSType_OPT: {
- const rdataOPT *opt;
- const rdataOPT *const end = (const rdataOPT *)&rd->data[rr->rdlength];
- length += mDNS_snprintf(buffer+length, RemSpc, "Max %d", rr->rrclass);
- for (opt = &rd->opt[0]; opt < end; opt++)
- {
- switch(opt->opt)
- {
- case kDNSOpt_LLQ:
- length += mDNS_snprintf(buffer+length, RemSpc, " Vers %d", opt->u.llq.vers);
- length += mDNS_snprintf(buffer+length, RemSpc, " Op %d", opt->u.llq.llqOp);
- length += mDNS_snprintf(buffer+length, RemSpc, " Err/Port %d", opt->u.llq.err);
- length += mDNS_snprintf(buffer+length, RemSpc, " ID %08X%08X", opt->u.llq.id.l[0], opt->u.llq.id.l[1]);
- length += mDNS_snprintf(buffer+length, RemSpc, " Lease %d", opt->u.llq.llqlease);
- break;
- case kDNSOpt_Lease:
- length += mDNS_snprintf(buffer+length, RemSpc, " Lease %d", opt->u.updatelease);
- break;
- case kDNSOpt_Owner:
- length += mDNS_snprintf(buffer+length, RemSpc, " Vers %d", opt->u.owner.vers);
- length += mDNS_snprintf(buffer+length, RemSpc, " Seq %3d", (mDNSu8)opt->u.owner.seq); // Display as unsigned
- length += mDNS_snprintf(buffer+length, RemSpc, " MAC %.6a", opt->u.owner.HMAC.b);
- if (opt->optlen >= DNSOpt_OwnerData_ID_Wake_Space-4)
- {
- length += mDNS_snprintf(buffer+length, RemSpc, " I-MAC %.6a", opt->u.owner.IMAC.b);
- if (opt->optlen > DNSOpt_OwnerData_ID_Wake_Space-4)
- length += mDNS_snprintf(buffer+length, RemSpc, " Password %.6a", opt->u.owner.password.b);
- }
- break;
- default:
- length += mDNS_snprintf(buffer+length, RemSpc, " Unknown %d", opt->opt);
- break;
- }
- }
- }
- break;
-
- case kDNSType_NSEC: {
- mDNSu16 i;
- for (i=0; i<255; i++)
- if (rd->nsec.bitmap[i>>3] & (128 >> (i&7)))
- length += mDNS_snprintf(buffer+length, RemSpc, "%s ", DNSTypeName(i));
- }
- break;
-
- default: mDNS_snprintf(buffer+length, RemSpc, "RDLen %d: %s", rr->rdlength, rd->data);
- // Really should scan buffer to check if text is valid UTF-8 and only replace with dots if not
- for (ptr = buffer; *ptr; ptr++) if (*ptr < ' ') *ptr = '.';
- break;
- }
- return(buffer);
- }
-
-// See comments in mDNSEmbeddedAPI.h
-#if _PLATFORM_HAS_STRONG_PRNG_
-#define mDNSRandomNumber mDNSPlatformRandomNumber
-#else
-mDNSlocal mDNSu32 mDNSRandomFromSeed(mDNSu32 seed)
- {
- return seed * 21 + 1;
- }
-
-mDNSlocal mDNSu32 mDNSMixRandomSeed(mDNSu32 seed, mDNSu8 iteration)
- {
- return iteration ? mDNSMixRandomSeed(mDNSRandomFromSeed(seed), --iteration) : seed;
- }
-
-mDNSlocal mDNSu32 mDNSRandomNumber()
- {
- static mDNSBool seeded = mDNSfalse;
- static mDNSu32 seed = 0;
- if (!seeded)
- {
- seed = mDNSMixRandomSeed(mDNSPlatformRandomSeed(), 100);
- seeded = mDNStrue;
- }
- return (seed = mDNSRandomFromSeed(seed));
- }
-#endif // ! _PLATFORM_HAS_STRONG_PRNG_
-
-mDNSexport mDNSu32 mDNSRandom(mDNSu32 max) // Returns pseudo-random result from zero to max inclusive
- {
- mDNSu32 ret = 0;
- mDNSu32 mask = 1;
-
- while (mask < max) mask = (mask << 1) | 1;
-
- do ret = mDNSRandomNumber() & mask;
- while (ret > max);
-
- return ret;
- }
-
-mDNSexport mDNSBool mDNSSameAddress(const mDNSAddr *ip1, const mDNSAddr *ip2)
- {
- if (ip1->type == ip2->type)
- {
- switch (ip1->type)
- {
- case mDNSAddrType_None : return(mDNStrue); // Empty addresses have no data and are therefore always equal
- case mDNSAddrType_IPv4 : return(mDNSBool)(mDNSSameIPv4Address(ip1->ip.v4, ip2->ip.v4));
- case mDNSAddrType_IPv6 : return(mDNSBool)(mDNSSameIPv6Address(ip1->ip.v6, ip2->ip.v6));
- }
- }
- return(mDNSfalse);
- }
-
-mDNSexport mDNSBool mDNSAddrIsDNSMulticast(const mDNSAddr *ip)
- {
- switch(ip->type)
- {
- case mDNSAddrType_IPv4: return(mDNSBool)(mDNSSameIPv4Address(ip->ip.v4, AllDNSLinkGroup_v4.ip.v4));
- case mDNSAddrType_IPv6: return(mDNSBool)(mDNSSameIPv6Address(ip->ip.v6, AllDNSLinkGroup_v6.ip.v6));
- default: return(mDNSfalse);
- }
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - Domain Name Utility Functions
-#endif
-
-mDNSexport mDNSBool SameDomainLabel(const mDNSu8 *a, const mDNSu8 *b)
- {
- int i;
- const int len = *a++;
-
- if (len > MAX_DOMAIN_LABEL)
- { debugf("Malformed label (too long)"); return(mDNSfalse); }
-
- if (len != *b++) return(mDNSfalse);
- for (i=0; i<len; i++)
- {
- mDNSu8 ac = *a++;
- mDNSu8 bc = *b++;
- if (mDNSIsUpperCase(ac)) ac += 'a' - 'A';
- if (mDNSIsUpperCase(bc)) bc += 'a' - 'A';
- if (ac != bc) return(mDNSfalse);
- }
- return(mDNStrue);
- }
-
-mDNSexport mDNSBool SameDomainName(const domainname *const d1, const domainname *const d2)
- {
- const mDNSu8 * a = d1->c;
- const mDNSu8 * b = d2->c;
- const mDNSu8 *const max = d1->c + MAX_DOMAIN_NAME; // Maximum that's valid
-
- while (*a || *b)
- {
- if (a + 1 + *a >= max)
- { debugf("Malformed domain name (more than 256 characters)"); return(mDNSfalse); }
- if (!SameDomainLabel(a, b)) return(mDNSfalse);
- a += 1 + *a;
- b += 1 + *b;
- }
-
- return(mDNStrue);
- }
-
-mDNSexport mDNSBool SameDomainNameCS(const domainname *const d1, const domainname *const d2)
- {
- mDNSu16 l1 = DomainNameLength(d1);
- mDNSu16 l2 = DomainNameLength(d2);
- return(l1 <= MAX_DOMAIN_NAME && l1 == l2 && mDNSPlatformMemSame(d1, d2, l1));
- }
-
-mDNSexport mDNSBool IsLocalDomain(const domainname *d)
- {
- // Domains that are defined to be resolved via link-local multicast are:
- // local., 254.169.in-addr.arpa., and {8,9,A,B}.E.F.ip6.arpa.
- static const domainname *nL = (const domainname*)"\x5" "local";
- static const domainname *nR = (const domainname*)"\x3" "254" "\x3" "169" "\x7" "in-addr" "\x4" "arpa";
- static const domainname *n8 = (const domainname*)"\x1" "8" "\x1" "e" "\x1" "f" "\x3" "ip6" "\x4" "arpa";
- static const domainname *n9 = (const domainname*)"\x1" "9" "\x1" "e" "\x1" "f" "\x3" "ip6" "\x4" "arpa";
- static const domainname *nA = (const domainname*)"\x1" "a" "\x1" "e" "\x1" "f" "\x3" "ip6" "\x4" "arpa";
- static const domainname *nB = (const domainname*)"\x1" "b" "\x1" "e" "\x1" "f" "\x3" "ip6" "\x4" "arpa";
-
- const domainname *d1, *d2, *d3, *d4, *d5; // Top-level domain, second-level domain, etc.
- d1 = d2 = d3 = d4 = d5 = mDNSNULL;
- while (d->c[0])
- {
- d5 = d4; d4 = d3; d3 = d2; d2 = d1; d1 = d;
- d = (const domainname*)(d->c + 1 + d->c[0]);
- }
-
- if (d1 && SameDomainName(d1, nL)) return(mDNStrue);
- if (d4 && SameDomainName(d4, nR)) return(mDNStrue);
- if (d5 && SameDomainName(d5, n8)) return(mDNStrue);
- if (d5 && SameDomainName(d5, n9)) return(mDNStrue);
- if (d5 && SameDomainName(d5, nA)) return(mDNStrue);
- if (d5 && SameDomainName(d5, nB)) return(mDNStrue);
- return(mDNSfalse);
- }
-
-mDNSexport const mDNSu8 *LastLabel(const domainname *d)
- {
- const mDNSu8 *p = d->c;
- while (d->c[0])
- {
- p = d->c;
- d = (const domainname*)(d->c + 1 + d->c[0]);
- }
- return(p);
- }
-
-// Returns length of a domain name INCLUDING the byte for the final null label
-// e.g. for the root label "." it returns one
-// For the FQDN "com." it returns 5 (length byte, three data bytes, final zero)
-// Legal results are 1 (just root label) to 256 (MAX_DOMAIN_NAME)
-// If the given domainname is invalid, result is 257 (MAX_DOMAIN_NAME+1)
-mDNSexport mDNSu16 DomainNameLengthLimit(const domainname *const name, const mDNSu8 *limit)
- {
- const mDNSu8 *src = name->c;
- while (src < limit && *src <= MAX_DOMAIN_LABEL)
- {
- if (*src == 0) return((mDNSu16)(src - name->c + 1));
- src += 1 + *src;
- }
- return(MAX_DOMAIN_NAME+1);
- }
-
-// CompressedDomainNameLength returns the length of a domain name INCLUDING the byte
-// for the final null label, e.g. for the root label "." it returns one.
-// E.g. for the FQDN "foo.com." it returns 9
-// (length, three data bytes, length, three more data bytes, final zero).
-// In the case where a parent domain name is provided, and the given name is a child
-// of that parent, CompressedDomainNameLength returns the length of the prefix portion
-// of the child name, plus TWO bytes for the compression pointer.
-// E.g. for the name "foo.com." with parent "com.", it returns 6
-// (length, three data bytes, two-byte compression pointer).
-mDNSexport mDNSu16 CompressedDomainNameLength(const domainname *const name, const domainname *parent)
- {
- const mDNSu8 *src = name->c;
- if (parent && parent->c[0] == 0) parent = mDNSNULL;
- while (*src)
- {
- if (*src > MAX_DOMAIN_LABEL) return(MAX_DOMAIN_NAME+1);
- if (parent && SameDomainName((const domainname *)src, parent)) return((mDNSu16)(src - name->c + 2));
- src += 1 + *src;
- if (src - name->c >= MAX_DOMAIN_NAME) return(MAX_DOMAIN_NAME+1);
- }
- return((mDNSu16)(src - name->c + 1));
- }
-
-// CountLabels() returns number of labels in name, excluding final root label
-// (e.g. for "apple.com." CountLabels returns 2.)
-mDNSexport int CountLabels(const domainname *d)
- {
- int count = 0;
- const mDNSu8 *ptr;
- for (ptr = d->c; *ptr; ptr = ptr + ptr[0] + 1) count++;
- return count;
- }
-
-// SkipLeadingLabels skips over the first 'skip' labels in the domainname,
-// returning a pointer to the suffix with 'skip' labels removed.
-mDNSexport const domainname *SkipLeadingLabels(const domainname *d, int skip)
- {
- while (skip > 0 && d->c[0]) { d = (const domainname *)(d->c + 1 + d->c[0]); skip--; }
- return(d);
- }
-
-// AppendLiteralLabelString appends a single label to an existing (possibly empty) domainname.
-// The C string contains the label as-is, with no escaping, etc.
-// Any dots in the name are literal dots, not label separators
-// If successful, AppendLiteralLabelString returns a pointer to the next unused byte
-// in the domainname bufer (i.e. the next byte after the terminating zero).
-// If unable to construct a legal domain name (i.e. label more than 63 bytes, or total more than 256 bytes)
-// AppendLiteralLabelString returns mDNSNULL.
-mDNSexport mDNSu8 *AppendLiteralLabelString(domainname *const name, const char *cstr)
- {
- mDNSu8 * ptr = name->c + DomainNameLength(name) - 1; // Find end of current name
- const mDNSu8 *const lim1 = name->c + MAX_DOMAIN_NAME - 1; // Limit of how much we can add (not counting final zero)
- const mDNSu8 *const lim2 = ptr + 1 + MAX_DOMAIN_LABEL;
- const mDNSu8 *const lim = (lim1 < lim2) ? lim1 : lim2;
- mDNSu8 *lengthbyte = ptr++; // Record where the length is going to go
-
- while (*cstr && ptr < lim) *ptr++ = (mDNSu8)*cstr++; // Copy the data
- *lengthbyte = (mDNSu8)(ptr - lengthbyte - 1); // Fill in the length byte
- *ptr++ = 0; // Put the null root label on the end
- if (*cstr) return(mDNSNULL); // Failure: We didn't successfully consume all input
- else return(ptr); // Success: return new value of ptr
- }
-
-// AppendDNSNameString appends zero or more labels to an existing (possibly empty) domainname.
-// The C string is in conventional DNS syntax:
-// Textual labels, escaped as necessary using the usual DNS '\' notation, separated by dots.
-// If successful, AppendDNSNameString returns a pointer to the next unused byte
-// in the domainname bufer (i.e. the next byte after the terminating zero).
-// If unable to construct a legal domain name (i.e. label more than 63 bytes, or total more than 256 bytes)
-// AppendDNSNameString returns mDNSNULL.
-mDNSexport mDNSu8 *AppendDNSNameString(domainname *const name, const char *cstring)
- {
- const char *cstr = cstring;
- mDNSu8 * ptr = name->c + DomainNameLength(name) - 1; // Find end of current name
- const mDNSu8 *const lim = name->c + MAX_DOMAIN_NAME - 1; // Limit of how much we can add (not counting final zero)
- while (*cstr && ptr < lim) // While more characters, and space to put them...
- {
- mDNSu8 *lengthbyte = ptr++; // Record where the length is going to go
- if (*cstr == '.') { LogMsg("AppendDNSNameString: Illegal empty label in name \"%s\"", cstring); return(mDNSNULL); }
- while (*cstr && *cstr != '.' && ptr < lim) // While we have characters in the label...
- {
- mDNSu8 c = (mDNSu8)*cstr++; // Read the character
- if (c == '\\') // If escape character, check next character
- {
- c = (mDNSu8)*cstr++; // Assume we'll just take the next character
- if (mDNSIsDigit(cstr[-1]) && mDNSIsDigit(cstr[0]) && mDNSIsDigit(cstr[1]))
- { // If three decimal digits,
- int v0 = cstr[-1] - '0'; // then interpret as three-digit decimal
- int v1 = cstr[ 0] - '0';
- int v2 = cstr[ 1] - '0';
- int val = v0 * 100 + v1 * 10 + v2;
- if (val <= 255) { c = (mDNSu8)val; cstr += 2; } // If valid three-digit decimal value, use it
- }
- }
- *ptr++ = c; // Write the character
- }
- if (*cstr) cstr++; // Skip over the trailing dot (if present)
- if (ptr - lengthbyte - 1 > MAX_DOMAIN_LABEL) // If illegal label, abort
- return(mDNSNULL);
- *lengthbyte = (mDNSu8)(ptr - lengthbyte - 1); // Fill in the length byte
- }
-
- *ptr++ = 0; // Put the null root label on the end
- if (*cstr) return(mDNSNULL); // Failure: We didn't successfully consume all input
- else return(ptr); // Success: return new value of ptr
- }
-
-// AppendDomainLabel appends a single label to a name.
-// If successful, AppendDomainLabel returns a pointer to the next unused byte
-// in the domainname bufer (i.e. the next byte after the terminating zero).
-// If unable to construct a legal domain name (i.e. label more than 63 bytes, or total more than 256 bytes)
-// AppendDomainLabel returns mDNSNULL.
-mDNSexport mDNSu8 *AppendDomainLabel(domainname *const name, const domainlabel *const label)
- {
- int i;
- mDNSu8 *ptr = name->c + DomainNameLength(name) - 1;
-
- // Check label is legal
- if (label->c[0] > MAX_DOMAIN_LABEL) return(mDNSNULL);
-
- // Check that ptr + length byte + data bytes + final zero does not exceed our limit
- if (ptr + 1 + label->c[0] + 1 > name->c + MAX_DOMAIN_NAME) return(mDNSNULL);
-
- for (i=0; i<=label->c[0]; i++) *ptr++ = label->c[i]; // Copy the label data
- *ptr++ = 0; // Put the null root label on the end
- return(ptr);
- }
-
-mDNSexport mDNSu8 *AppendDomainName(domainname *const name, const domainname *const append)
- {
- mDNSu8 * ptr = name->c + DomainNameLength(name) - 1; // Find end of current name
- const mDNSu8 *const lim = name->c + MAX_DOMAIN_NAME - 1; // Limit of how much we can add (not counting final zero)
- const mDNSu8 * src = append->c;
- while (src[0])
- {
- int i;
- if (ptr + 1 + src[0] > lim) return(mDNSNULL);
- for (i=0; i<=src[0]; i++) *ptr++ = src[i];
- *ptr = 0; // Put the null root label on the end
- src += i;
- }
- return(ptr);
- }
-
-// MakeDomainLabelFromLiteralString makes a single domain label from a single literal C string (with no escaping).
-// If successful, MakeDomainLabelFromLiteralString returns mDNStrue.
-// If unable to convert the whole string to a legal domain label (i.e. because length is more than 63 bytes) then
-// MakeDomainLabelFromLiteralString makes a legal domain label from the first 63 bytes of the string and returns mDNSfalse.
-// In some cases silently truncated oversized names to 63 bytes is acceptable, so the return result may be ignored.
-// In other cases silent truncation may not be acceptable, so in those cases the calling function needs to check the return result.
-mDNSexport mDNSBool MakeDomainLabelFromLiteralString(domainlabel *const label, const char *cstr)
- {
- mDNSu8 * ptr = label->c + 1; // Where we're putting it
- const mDNSu8 *const limit = label->c + 1 + MAX_DOMAIN_LABEL; // The maximum we can put
- while (*cstr && ptr < limit) *ptr++ = (mDNSu8)*cstr++; // Copy the label
- label->c[0] = (mDNSu8)(ptr - label->c - 1); // Set the length byte
- return(*cstr == 0); // Return mDNStrue if we successfully consumed all input
- }
-
-// MakeDomainNameFromDNSNameString makes a native DNS-format domainname from a C string.
-// The C string is in conventional DNS syntax:
-// Textual labels, escaped as necessary using the usual DNS '\' notation, separated by dots.
-// If successful, MakeDomainNameFromDNSNameString returns a pointer to the next unused byte
-// in the domainname bufer (i.e. the next byte after the terminating zero).
-// If unable to construct a legal domain name (i.e. label more than 63 bytes, or total more than 256 bytes)
-// MakeDomainNameFromDNSNameString returns mDNSNULL.
-mDNSexport mDNSu8 *MakeDomainNameFromDNSNameString(domainname *const name, const char *cstr)
- {
- name->c[0] = 0; // Make an empty domain name
- return(AppendDNSNameString(name, cstr)); // And then add this string to it
- }
-
-mDNSexport char *ConvertDomainLabelToCString_withescape(const domainlabel *const label, char *ptr, char esc)
- {
- const mDNSu8 * src = label->c; // Domain label we're reading
- const mDNSu8 len = *src++; // Read length of this (non-null) label
- const mDNSu8 *const end = src + len; // Work out where the label ends
- if (len > MAX_DOMAIN_LABEL) return(mDNSNULL); // If illegal label, abort
- while (src < end) // While we have characters in the label
- {
- mDNSu8 c = *src++;
- if (esc)
- {
- if (c == '.' || c == esc) // If character is a dot or the escape character
- *ptr++ = esc; // Output escape character
- else if (c <= ' ') // If non-printing ascii,
- { // Output decimal escape sequence
- *ptr++ = esc;
- *ptr++ = (char) ('0' + (c / 100) );
- *ptr++ = (char) ('0' + (c / 10) % 10);
- c = (mDNSu8)('0' + (c ) % 10);
- }
- }
- *ptr++ = (char)c; // Copy the character
- }
- *ptr = 0; // Null-terminate the string
- return(ptr); // and return
- }
-
-// Note: To guarantee that there will be no possible overrun, cstr must be at least MAX_ESCAPED_DOMAIN_NAME (1009 bytes)
-mDNSexport char *ConvertDomainNameToCString_withescape(const domainname *const name, char *ptr, char esc)
- {
- const mDNSu8 *src = name->c; // Domain name we're reading
- const mDNSu8 *const max = name->c + MAX_DOMAIN_NAME; // Maximum that's valid
-
- if (*src == 0) *ptr++ = '.'; // Special case: For root, just write a dot
-
- while (*src) // While more characters in the domain name
- {
- if (src + 1 + *src >= max) return(mDNSNULL);
- ptr = ConvertDomainLabelToCString_withescape((const domainlabel *)src, ptr, esc);
- if (!ptr) return(mDNSNULL);
- src += 1 + *src;
- *ptr++ = '.'; // Write the dot after the label
- }
-
- *ptr++ = 0; // Null-terminate the string
- return(ptr); // and return
- }
-
-// RFC 1034 rules:
-// Host names must start with a letter, end with a letter or digit,
-// and have as interior characters only letters, digits, and hyphen.
-// This was subsequently modified in RFC 1123 to allow the first character to be either a letter or a digit
-
-mDNSexport void ConvertUTF8PstringToRFC1034HostLabel(const mDNSu8 UTF8Name[], domainlabel *const hostlabel)
- {
- const mDNSu8 * src = &UTF8Name[1];
- const mDNSu8 *const end = &UTF8Name[1] + UTF8Name[0];
- mDNSu8 * ptr = &hostlabel->c[1];
- const mDNSu8 *const lim = &hostlabel->c[1] + MAX_DOMAIN_LABEL;
- while (src < end)
- {
- // Delete apostrophes from source name
- if (src[0] == '\'') { src++; continue; } // Standard straight single quote
- if (src + 2 < end && src[0] == 0xE2 && src[1] == 0x80 && src[2] == 0x99)
- { src += 3; continue; } // Unicode curly apostrophe
- if (ptr < lim)
- {
- if (mDNSValidHostChar(*src, (ptr > &hostlabel->c[1]), (src < end-1))) *ptr++ = *src;
- else if (ptr > &hostlabel->c[1] && ptr[-1] != '-') *ptr++ = '-';
- }
- src++;
- }
- while (ptr > &hostlabel->c[1] && ptr[-1] == '-') ptr--; // Truncate trailing '-' marks
- hostlabel->c[0] = (mDNSu8)(ptr - &hostlabel->c[1]);
- }
-
-#define ValidTransportProtocol(X) ( (X)[0] == 4 && (X)[1] == '_' && \
- ((((X)[2] | 0x20) == 'u' && ((X)[3] | 0x20) == 'd') || (((X)[2] | 0x20) == 't' && ((X)[3] | 0x20) == 'c')) && \
- ((X)[4] | 0x20) == 'p')
-
-mDNSexport mDNSu8 *ConstructServiceName(domainname *const fqdn,
- const domainlabel *name, const domainname *type, const domainname *const domain)
- {
- int i, len;
- mDNSu8 *dst = fqdn->c;
- const mDNSu8 *src;
- const char *errormsg;
-#if APPLE_OSX_mDNSResponder
- mDNSBool loggedUnderscore = mDNSfalse;
- static char typeBuf[MAX_ESCAPED_DOMAIN_NAME];
-#endif
-
- // In the case where there is no name (and ONLY in that case),
- // a single-label subtype is allowed as the first label of a three-part "type"
- if (!name && type)
- {
- const mDNSu8 *s0 = type->c;
- if (s0[0] && s0[0] < 0x40) // If legal first label (at least one character, and no more than 63)
- {
- const mDNSu8 * s1 = s0 + 1 + s0[0];
- if (s1[0] && s1[0] < 0x40) // and legal second label (at least one character, and no more than 63)
- {
- const mDNSu8 *s2 = s1 + 1 + s1[0];
- if (s2[0] && s2[0] < 0x40 && s2[1+s2[0]] == 0) // and we have three and only three labels
- {
- static const mDNSu8 SubTypeLabel[5] = "\x04_sub";
- src = s0; // Copy the first label
- len = *src;
- for (i=0; i <= len; i++) *dst++ = *src++;
- for (i=0; i < (int)sizeof(SubTypeLabel); i++) *dst++ = SubTypeLabel[i];
- type = (const domainname *)s1;
-
- // Special support to enable the DNSServiceBrowse call made by Bonjour Browser
- // For these queries, we retract the "._sub" we just added between the subtype and the main type
- // Remove after Bonjour Browser is updated to use DNSServiceQueryRecord instead of DNSServiceBrowse
- if (SameDomainName((domainname*)s0, (const domainname*)"\x09_services\x07_dns-sd\x04_udp"))
- dst -= sizeof(SubTypeLabel);
- }
- }
- }
- }
-
- if (name && name->c[0])
- {
- src = name->c; // Put the service name into the domain name
- len = *src;
- if (len >= 0x40) { errormsg = "Service instance name too long"; goto fail; }
- for (i=0; i<=len; i++) *dst++ = *src++;
- }
- else
- name = (domainlabel*)""; // Set this up to be non-null, to avoid errors if we have to call LogMsg() below
-
- src = type->c; // Put the service type into the domain name
- len = *src;
- if (len < 2 || len > 16)
- {
- LogMsg("Bad service type in %#s.%##s%##s Application protocol name must be underscore plus 1-15 characters. "
- "See <http://www.dns-sd.org/ServiceTypes.html>", name->c, type->c, domain->c);
-#if APPLE_OSX_mDNSResponder
- ConvertDomainNameToCString(type, typeBuf);
- mDNSASLLog(mDNSNULL, "serviceType.nameTooLong", "noop", typeBuf, "");
-#endif
- }
- if (len < 2 || len >= 0x40 || (len > 16 && !SameDomainName(domain, &localdomain))) return(mDNSNULL);
- if (src[1] != '_') { errormsg = "Application protocol name must begin with underscore"; goto fail; }
- for (i=2; i<=len; i++)
- {
- // Letters and digits are allowed anywhere
- if (mDNSIsLetter(src[i]) || mDNSIsDigit(src[i])) continue;
- // Hyphens are only allowed as interior characters
- // Underscores are not supposed to be allowed at all, but for backwards compatibility with some old products we do allow them,
- // with the same rule as hyphens
- if ((src[i] == '-' || src[i] == '_') && i > 2 && i < len)
- {
-#if APPLE_OSX_mDNSResponder
- if (src[i] == '_' && loggedUnderscore == mDNSfalse)
- {
- ConvertDomainNameToCString(type, typeBuf);
- mDNSASLLog(mDNSNULL, "serviceType.nameWithUnderscore", "noop", typeBuf, "");
- loggedUnderscore = mDNStrue;
- }
-#endif
- continue;
- }
- errormsg = "Application protocol name must contain only letters, digits, and hyphens";
-#if APPLE_OSX_mDNSResponder
- {
- ConvertDomainNameToCString(type, typeBuf);
- mDNSASLLog(mDNSNULL, "serviceType.nameWithIllegalCharacters", "noop", typeBuf, "");
- }
-#endif
- goto fail;
- }
- for (i=0; i<=len; i++) *dst++ = *src++;
-
- len = *src;
- if (!ValidTransportProtocol(src)) { errormsg = "Transport protocol name must be _udp or _tcp"; goto fail; }
- for (i=0; i<=len; i++) *dst++ = *src++;
-
- if (*src) { errormsg = "Service type must have only two labels"; goto fail; }
-
- *dst = 0;
- if (!domain->c[0]) { errormsg = "Service domain must be non-empty"; goto fail; }
- if (SameDomainName(domain, (const domainname*)"\x05" "local" "\x04" "arpa"))
- { errormsg = "Illegal domain \"local.arpa.\" Use \"local.\" (or empty string)"; goto fail; }
- dst = AppendDomainName(fqdn, domain);
- if (!dst) { errormsg = "Service domain too long"; goto fail; }
- return(dst);
-
-fail:
- LogMsg("ConstructServiceName: %s: %#s.%##s%##s", errormsg, name->c, type->c, domain->c);
- return(mDNSNULL);
- }
-
-// A service name has the form: instance.application-protocol.transport-protocol.domain
-// DeconstructServiceName is currently fairly forgiving: It doesn't try to enforce character
-// set or length limits for the protocol names, and the final domain is allowed to be empty.
-// However, if the given FQDN doesn't contain at least three labels,
-// DeconstructServiceName will reject it and return mDNSfalse.
-mDNSexport mDNSBool DeconstructServiceName(const domainname *const fqdn,
- domainlabel *const name, domainname *const type, domainname *const domain)
- {
- int i, len;
- const mDNSu8 *src = fqdn->c;
- const mDNSu8 *max = fqdn->c + MAX_DOMAIN_NAME;
- mDNSu8 *dst;
-
- dst = name->c; // Extract the service name
- len = *src;
- if (!len) { debugf("DeconstructServiceName: FQDN empty!"); return(mDNSfalse); }
- if (len >= 0x40) { debugf("DeconstructServiceName: Instance name too long"); return(mDNSfalse); }
- for (i=0; i<=len; i++) *dst++ = *src++;
-
- dst = type->c; // Extract the service type
- len = *src;
- if (!len) { debugf("DeconstructServiceName: FQDN contains only one label!"); return(mDNSfalse); }
- if (len >= 0x40) { debugf("DeconstructServiceName: Application protocol name too long"); return(mDNSfalse); }
- if (src[1] != '_'){ debugf("DeconstructServiceName: No _ at start of application protocol"); return(mDNSfalse); }
- for (i=0; i<=len; i++) *dst++ = *src++;
-
- len = *src;
- if (!len) { debugf("DeconstructServiceName: FQDN contains only two labels!"); return(mDNSfalse); }
- if (!ValidTransportProtocol(src))
- { debugf("DeconstructServiceName: Transport protocol must be _udp or _tcp"); return(mDNSfalse); }
- for (i=0; i<=len; i++) *dst++ = *src++;
- *dst++ = 0; // Put terminator on the end of service type
-
- dst = domain->c; // Extract the service domain
- while (*src)
- {
- len = *src;
- if (len >= 0x40)
- { debugf("DeconstructServiceName: Label in service domain too long"); return(mDNSfalse); }
- if (src + 1 + len + 1 >= max)
- { debugf("DeconstructServiceName: Total service domain too long"); return(mDNSfalse); }
- for (i=0; i<=len; i++) *dst++ = *src++;
- }
- *dst++ = 0; // Put the null root label on the end
-
- return(mDNStrue);
- }
-
-// Notes on UTF-8:
-// 0xxxxxxx represents a 7-bit ASCII value from 0x00 to 0x7F
-// 10xxxxxx is a continuation byte of a multi-byte character
-// 110xxxxx is the first byte of a 2-byte character (11 effective bits; values 0x 80 - 0x 800-1)
-// 1110xxxx is the first byte of a 3-byte character (16 effective bits; values 0x 800 - 0x 10000-1)
-// 11110xxx is the first byte of a 4-byte character (21 effective bits; values 0x 10000 - 0x 200000-1)
-// 111110xx is the first byte of a 5-byte character (26 effective bits; values 0x 200000 - 0x 4000000-1)
-// 1111110x is the first byte of a 6-byte character (31 effective bits; values 0x4000000 - 0x80000000-1)
-//
-// UTF-16 surrogate pairs are used in UTF-16 to encode values larger than 0xFFFF.
-// Although UTF-16 surrogate pairs are not supposed to appear in legal UTF-8, we want to be defensive
-// about that too. (See <http://www.unicode.org/faq/utf_bom.html#34>, "What are surrogates?")
-// The first of pair is a UTF-16 value in the range 0xD800-0xDBFF (11101101 1010xxxx 10xxxxxx in UTF-8),
-// and the second is a UTF-16 value in the range 0xDC00-0xDFFF (11101101 1011xxxx 10xxxxxx in UTF-8).
-
-mDNSexport mDNSu32 TruncateUTF8ToLength(mDNSu8 *string, mDNSu32 length, mDNSu32 max)
- {
- if (length > max)
- {
- mDNSu8 c1 = string[max]; // First byte after cut point
- mDNSu8 c2 = (max+1 < length) ? string[max+1] : (mDNSu8)0xB0; // Second byte after cut point
- length = max; // Trim length down
- while (length > 0)
- {
- // Check if the byte right after the chop point is a UTF-8 continuation byte,
- // or if the character right after the chop point is the second of a UTF-16 surrogate pair.
- // If so, then we continue to chop more bytes until we get to a legal chop point.
- mDNSBool continuation = ((c1 & 0xC0) == 0x80);
- mDNSBool secondsurrogate = (c1 == 0xED && (c2 & 0xF0) == 0xB0);
- if (!continuation && !secondsurrogate) break;
- c2 = c1;
- c1 = string[--length];
- }
- // Having truncated characters off the end of our string, also cut off any residual white space
- while (length > 0 && string[length-1] <= ' ') length--;
- }
- return(length);
- }
-
-// Returns true if a rich text label ends in " (nnn)", or if an RFC 1034
-// name ends in "-nnn", where n is some decimal number.
-mDNSexport mDNSBool LabelContainsSuffix(const domainlabel *const name, const mDNSBool RichText)
- {
- mDNSu16 l = name->c[0];
-
- if (RichText)
- {
- if (l < 4) return mDNSfalse; // Need at least " (2)"
- if (name->c[l--] != ')') return mDNSfalse; // Last char must be ')'
- if (!mDNSIsDigit(name->c[l])) return mDNSfalse; // Preceeded by a digit
- l--;
- while (l > 2 && mDNSIsDigit(name->c[l])) l--; // Strip off digits
- return (name->c[l] == '(' && name->c[l - 1] == ' ');
- }
- else
- {
- if (l < 2) return mDNSfalse; // Need at least "-2"
- if (!mDNSIsDigit(name->c[l])) return mDNSfalse; // Last char must be a digit
- l--;
- while (l > 2 && mDNSIsDigit(name->c[l])) l--; // Strip off digits
- return (name->c[l] == '-');
- }
- }
-
-// removes an auto-generated suffix (appended on a name collision) from a label. caller is
-// responsible for ensuring that the label does indeed contain a suffix. returns the number
-// from the suffix that was removed.
-mDNSexport mDNSu32 RemoveLabelSuffix(domainlabel *name, mDNSBool RichText)
- {
- mDNSu32 val = 0, multiplier = 1;
-
- // Chop closing parentheses from RichText suffix
- if (RichText && name->c[0] >= 1 && name->c[name->c[0]] == ')') name->c[0]--;
-
- // Get any existing numerical suffix off the name
- while (mDNSIsDigit(name->c[name->c[0]]))
- { val += (name->c[name->c[0]] - '0') * multiplier; multiplier *= 10; name->c[0]--; }
-
- // Chop opening parentheses or dash from suffix
- if (RichText)
- {
- if (name->c[0] >= 2 && name->c[name->c[0]] == '(' && name->c[name->c[0]-1] == ' ') name->c[0] -= 2;
- }
- else
- {
- if (name->c[0] >= 1 && name->c[name->c[0]] == '-') name->c[0] -= 1;
- }
-
- return(val);
- }
-
-// appends a numerical suffix to a label, with the number following a whitespace and enclosed
-// in parentheses (rich text) or following two consecutive hyphens (RFC 1034 domain label).
-mDNSexport void AppendLabelSuffix(domainlabel *const name, mDNSu32 val, const mDNSBool RichText)
- {
- mDNSu32 divisor = 1, chars = 2; // Shortest possible RFC1034 name suffix is 2 characters ("-2")
- if (RichText) chars = 4; // Shortest possible RichText suffix is 4 characters (" (2)")
-
- // Truncate trailing spaces from RichText names
- if (RichText) while (name->c[name->c[0]] == ' ') name->c[0]--;
-
- while (divisor < 0xFFFFFFFFUL/10 && val >= divisor * 10) { divisor *= 10; chars++; }
-
- name->c[0] = (mDNSu8) TruncateUTF8ToLength(name->c+1, name->c[0], MAX_DOMAIN_LABEL - chars);
-
- if (RichText) { name->c[++name->c[0]] = ' '; name->c[++name->c[0]] = '('; }
- else { name->c[++name->c[0]] = '-'; }
-
- while (divisor)
- {
- name->c[++name->c[0]] = (mDNSu8)('0' + val / divisor);
- val %= divisor;
- divisor /= 10;
- }
-
- if (RichText) name->c[++name->c[0]] = ')';
- }
-
-mDNSexport void IncrementLabelSuffix(domainlabel *name, mDNSBool RichText)
- {
- mDNSu32 val = 0;
-
- if (LabelContainsSuffix(name, RichText))
- val = RemoveLabelSuffix(name, RichText);
-
- // If no existing suffix, start by renaming "Foo" as "Foo (2)" or "Foo-2" as appropriate.
- // If existing suffix in the range 2-9, increment it.
- // If we've had ten conflicts already, there are probably too many hosts trying to use the same name,
- // so add a random increment to improve the chances of finding an available name next time.
- if (val == 0) val = 2;
- else if (val < 10) val++;
- else val += 1 + mDNSRandom(99);
-
- AppendLabelSuffix(name, val, RichText);
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - Resource Record Utility Functions
-#endif
-
-// Set up a AuthRecord with sensible default values.
-// These defaults may be overwritten with new values before mDNS_Register is called
-mDNSexport void mDNS_SetupResourceRecord(AuthRecord *rr, RData *RDataStorage, mDNSInterfaceID InterfaceID,
- mDNSu16 rrtype, mDNSu32 ttl, mDNSu8 RecordType, AuthRecType artype, mDNSRecordCallback Callback, void *Context)
- {
- //
- // LocalOnly auth record can be created with LocalOnly InterfaceID or a valid InterfaceID.
- // Most of the applications normally create with LocalOnly InterfaceID and we store them as
- // such, so that we can deliver the response to questions that specify LocalOnly InterfaceID.
- // LocalOnly resource records can also be created with valid InterfaceID which happens today
- // when we create LocalOnly records for /etc/hosts.
-
- if (InterfaceID == mDNSInterface_LocalOnly && artype != AuthRecordLocalOnly)
- {
- LogMsg("mDNS_SetupResourceRecord: ERROR!! Mismatch LocalOnly record InterfaceID %p called with artype %d", InterfaceID, artype);
- return;
- }
- else if (InterfaceID == mDNSInterface_P2P && artype != AuthRecordP2P)
- {
- LogMsg("mDNS_SetupResourceRecord: ERROR!! Mismatch P2P record InterfaceID %p called with artype %d", InterfaceID, artype);
- return;
- }
- else if (!InterfaceID && (artype == AuthRecordP2P || artype == AuthRecordLocalOnly))
- {
- LogMsg("mDNS_SetupResourceRecord: ERROR!! Mismatch InterfaceAny record InterfaceID %p called with artype %d", InterfaceID, artype);
- return;
- }
-
- // Don't try to store a TTL bigger than we can represent in platform time units
- if (ttl > 0x7FFFFFFFUL / mDNSPlatformOneSecond)
- ttl = 0x7FFFFFFFUL / mDNSPlatformOneSecond;
- else if (ttl == 0) // And Zero TTL is illegal
- ttl = DefaultTTLforRRType(rrtype);
-
- // Field Group 1: The actual information pertaining to this resource record
- rr->resrec.RecordType = RecordType;
- rr->resrec.InterfaceID = InterfaceID;
- rr->resrec.name = &rr->namestorage;
- rr->resrec.rrtype = rrtype;
- rr->resrec.rrclass = kDNSClass_IN;
- rr->resrec.rroriginalttl = ttl;
- rr->resrec.rDNSServer = mDNSNULL;
-// rr->resrec.rdlength = MUST set by client and/or in mDNS_Register_internal
-// rr->resrec.rdestimate = set in mDNS_Register_internal
-// rr->resrec.rdata = MUST be set by client
-
- if (RDataStorage)
- rr->resrec.rdata = RDataStorage;
- else
- {
- rr->resrec.rdata = &rr->rdatastorage;
- rr->resrec.rdata->MaxRDLength = sizeof(RDataBody);
- }
-
- // Field Group 2: Persistent metadata for Authoritative Records
- rr->Additional1 = mDNSNULL;
- rr->Additional2 = mDNSNULL;
- rr->DependentOn = mDNSNULL;
- rr->RRSet = mDNSNULL;
- rr->RecordCallback = Callback;
- rr->RecordContext = Context;
-
- rr->AutoTarget = Target_Manual;
- rr->AllowRemoteQuery = mDNSfalse;
- rr->ForceMCast = mDNSfalse;
-
- rr->WakeUp = zeroOwner;
- rr->AddressProxy = zeroAddr;
- rr->TimeRcvd = 0;
- rr->TimeExpire = 0;
- rr->ARType = artype;
-
- // Field Group 3: Transient state for Authoritative Records (set in mDNS_Register_internal)
- // Field Group 4: Transient uDNS state for Authoritative Records (set in mDNS_Register_internal)
-
- // For now, until the uDNS code is fully integrated, it's helpful to zero the uDNS state fields here too, just in case
- // (e.g. uDNS_RegisterService short-circuits the usual mDNS_Register_internal record registration calls, so a bunch
- // of fields don't get set up properly. In particular, if we don't zero rr->QueuedRData then the uDNS code crashes.)
- rr->state = regState_Zero;
- rr->uselease = 0;
- rr->expire = 0;
- rr->Private = 0;
- rr->updateid = zeroID;
- rr->zone = rr->resrec.name;
- rr->nta = mDNSNULL;
- rr->tcp = mDNSNULL;
- rr->OrigRData = 0;
- rr->OrigRDLen = 0;
- rr->InFlightRData = 0;
- rr->InFlightRDLen = 0;
- rr->QueuedRData = 0;
- rr->QueuedRDLen = 0;
- mDNSPlatformMemZero(&rr->NATinfo, sizeof(rr->NATinfo));
- rr->SRVChanged = mDNSfalse;
- rr->mState = mergeState_Zero;
-
- rr->namestorage.c[0] = 0; // MUST be set by client before calling mDNS_Register()
- }
-
-mDNSexport void mDNS_SetupQuestion(DNSQuestion *const q, const mDNSInterfaceID InterfaceID, const domainname *const name,
- const mDNSu16 qtype, mDNSQuestionCallback *const callback, void *const context)
- {
- q->InterfaceID = InterfaceID;
- q->Target = zeroAddr;
- AssignDomainName(&q->qname, name);
- q->qtype = qtype;
- q->qclass = kDNSClass_IN;
- q->LongLived = (qtype == kDNSType_PTR);
- q->ExpectUnique = (qtype != kDNSType_PTR);
- q->ForceMCast = mDNSfalse;
- q->ReturnIntermed = mDNSfalse;
- q->SuppressUnusable = mDNSfalse;
- q->SearchListIndex = 0;
- q->AppendSearchDomains = 0;
- q->RetryWithSearchDomains = mDNSfalse;
- q->TimeoutQuestion = 0;
- q->WakeOnResolve = 0;
- q->qnameOrig = mDNSNULL;
- q->QuestionCallback = callback;
- q->QuestionContext = context;
- }
-
-mDNSexport mDNSu32 RDataHashValue(const ResourceRecord *const rr)
- {
- int len = rr->rdlength;
- const RDataBody2 *const rdb = (RDataBody2 *)rr->rdata->u.data;
- switch(rr->rrtype)
- {
- case kDNSType_NS:
- case kDNSType_CNAME:
- case kDNSType_PTR:
- case kDNSType_DNAME: return DomainNameHashValue(&rdb->name);
-
- case kDNSType_SOA: return rdb->soa.serial +
- rdb->soa.refresh +
- rdb->soa.retry +
- rdb->soa.expire +
- rdb->soa.min +
- DomainNameHashValue(&rdb->soa.mname) +
- DomainNameHashValue(&rdb->soa.rname);
-
- case kDNSType_MX:
- case kDNSType_AFSDB:
- case kDNSType_RT:
- case kDNSType_KX: return DomainNameHashValue(&rdb->mx.exchange);
-
- case kDNSType_RP: return DomainNameHashValue(&rdb->rp.mbox) + DomainNameHashValue(&rdb->rp.txt);
-
- case kDNSType_PX: return DomainNameHashValue(&rdb->px.map822) + DomainNameHashValue(&rdb->px.mapx400);
-
- case kDNSType_SRV: return DomainNameHashValue(&rdb->srv.target);
-
- case kDNSType_OPT: return 0; // OPT is a pseudo-RR container structure; makes no sense to compare
-
- case kDNSType_NSEC: len = sizeof(rdataNSEC); // Use in-memory length of 32, and fall through default checksum computation below
-
- default:
- {
- mDNSu32 sum = 0;
- int i;
- for (i=0; i+1 < len; i+=2)
- {
- sum += (((mDNSu32)(rdb->data[i])) << 8) | rdb->data[i+1];
- sum = (sum<<3) | (sum>>29);
- }
- if (i < len)
- {
- sum += ((mDNSu32)(rdb->data[i])) << 8;
- }
- return(sum);
- }
- }
- }
-
-// r1 has to be a full ResourceRecord including rrtype and rdlength
-// r2 is just a bare RDataBody, which MUST be the same rrtype and rdlength as r1
-mDNSexport mDNSBool SameRDataBody(const ResourceRecord *const r1, const RDataBody *const r2, DomainNameComparisonFn *samename)
- {
- const RDataBody2 *const b1 = (RDataBody2 *)r1->rdata->u.data;
- const RDataBody2 *const b2 = (RDataBody2 *)r2;
- switch(r1->rrtype)
- {
- case kDNSType_NS:
- case kDNSType_CNAME:
- case kDNSType_PTR:
- case kDNSType_DNAME:return(SameDomainName(&b1->name, &b2->name));
-
- case kDNSType_SOA: return(mDNSBool)( b1->soa.serial == b2->soa.serial &&
- b1->soa.refresh == b2->soa.refresh &&
- b1->soa.retry == b2->soa.retry &&
- b1->soa.expire == b2->soa.expire &&
- b1->soa.min == b2->soa.min &&
- samename(&b1->soa.mname, &b2->soa.mname) &&
- samename(&b1->soa.rname, &b2->soa.rname));
-
- case kDNSType_MX:
- case kDNSType_AFSDB:
- case kDNSType_RT:
- case kDNSType_KX: return(mDNSBool)( b1->mx.preference == b2->mx.preference &&
- samename(&b1->mx.exchange, &b2->mx.exchange));
-
- case kDNSType_RP: return(mDNSBool)( samename(&b1->rp.mbox, &b2->rp.mbox) &&
- samename(&b1->rp.txt, &b2->rp.txt));
-
- case kDNSType_PX: return(mDNSBool)( b1->px.preference == b2->px.preference &&
- samename(&b1->px.map822, &b2->px.map822) &&
- samename(&b1->px.mapx400, &b2->px.mapx400));
-
- case kDNSType_SRV: return(mDNSBool)( b1->srv.priority == b2->srv.priority &&
- b1->srv.weight == b2->srv.weight &&
- mDNSSameIPPort(b1->srv.port, b2->srv.port) &&
- samename(&b1->srv.target, &b2->srv.target));
-
- case kDNSType_OPT: return mDNSfalse; // OPT is a pseudo-RR container structure; makes no sense to compare
-
- case kDNSType_NSEC: return(mDNSPlatformMemSame(b1->data, b2->data, sizeof(rdataNSEC)));
-
- default: return(mDNSPlatformMemSame(b1->data, b2->data, r1->rdlength));
- }
- }
-
-// ResourceRecordAnswersQuestion returns mDNStrue if the given resource record is a valid answer to the given question.
-// SameNameRecordAnswersQuestion is the same, except it skips the expensive SameDomainName() call.
-// SameDomainName() is generally cheap when the names don't match, but expensive when they do match,
-// because it has to check all the way to the end of the names to be sure.
-// In cases where we know in advance that the names match it's especially advantageous to skip the
-// SameDomainName() call because that's precisely the time when it's most expensive and least useful.
-
-mDNSexport mDNSBool SameNameRecordAnswersQuestion(const ResourceRecord *const rr, const DNSQuestion *const q)
- {
- // LocalOnly/P2P questions can be answered with AuthRecordAny in this function. LocalOnly/P2P records
- // are handled in LocalOnlyRecordAnswersQuestion
- if ((rr->InterfaceID == mDNSInterface_LocalOnly) || (rr->InterfaceID == mDNSInterface_P2P))
- {
- LogMsg("SameNameRecordAnswersQuestion: ERROR!! called with LocalOnly ResourceRecord %p, Question %p", rr->InterfaceID, q->InterfaceID);
- return mDNSfalse;
- }
- if (rr->InterfaceID &&
- q ->InterfaceID && q->InterfaceID != mDNSInterface_LocalOnly &&
- rr->InterfaceID != q->InterfaceID) return(mDNSfalse);
-
- // Resource record received via unicast, the DNSServer entries should match ?
- if (!rr->InterfaceID && rr->rDNSServer != q->qDNSServer) return(mDNSfalse);
-
- // If ResourceRecord received via multicast, but question was unicast, then shouldn't use record to answer this question
- if (rr->InterfaceID && !mDNSOpaque16IsZero(q->TargetQID)) return(mDNSfalse);
-
- // RR type CNAME matches any query type. QTYPE ANY matches any RR type. QCLASS ANY matches any RR class.
- if (!RRTypeAnswersQuestionType(rr,q->qtype)) return(mDNSfalse);
- if (rr->rrclass != q->qclass && q->qclass != kDNSQClass_ANY) return(mDNSfalse);
-
- return(mDNStrue);
- }
-
-mDNSexport mDNSBool ResourceRecordAnswersQuestion(const ResourceRecord *const rr, const DNSQuestion *const q)
- {
- // LocalOnly/P2P questions can be answered with AuthRecordAny in this function. LocalOnly/P2P records
- // are handled in LocalOnlyRecordAnswersQuestion
- if ((rr->InterfaceID == mDNSInterface_LocalOnly) || (rr->InterfaceID == mDNSInterface_P2P))
- {
- LogMsg("ResourceRecordAnswersQuestion: ERROR!! called with LocalOnly/P2P ResourceRecord %p, Question %p", rr->InterfaceID, q->InterfaceID);
- return mDNSfalse;
- }
-
- if (rr->InterfaceID &&
- q ->InterfaceID && q->InterfaceID != mDNSInterface_LocalOnly &&
- rr->InterfaceID != q->InterfaceID) return(mDNSfalse);
-
- // Resource record received via unicast, the DNSServer entries should match ?
- if (!rr->InterfaceID && rr->rDNSServer != q->qDNSServer) return(mDNSfalse);
-
- // If ResourceRecord received via multicast, but question was unicast, then shouldn't use record to answer this question.
- if (rr->InterfaceID && !mDNSOpaque16IsZero(q->TargetQID)) return(mDNSfalse);
-
- // RR type CNAME matches any query type. QTYPE ANY matches any RR type. QCLASS ANY matches any RR class.
- if (!RRTypeAnswersQuestionType(rr,q->qtype)) return(mDNSfalse);
- if (rr->rrclass != q->qclass && q->qclass != kDNSQClass_ANY) return(mDNSfalse);
-
- return(rr->namehash == q->qnamehash && SameDomainName(rr->name, &q->qname));
- }
-
-// We have a separate function to handle LocalOnly AuthRecords because they can be created with
-// a valid InterfaceID (e.g., scoped /etc/hosts) and can be used to answer unicast questions unlike
-// multicast resource records (which has a valid InterfaceID) which can't be used to answer
-// unicast questions. ResourceRecordAnswersQuestion/SameNameRecordAnswersQuestion can't tell whether
-// a resource record is multicast or LocalOnly by just looking at the ResourceRecord because
-// LocalOnly records are truly identified by ARType in the AuthRecord. As P2P and LocalOnly record
-// are kept in the same hash table, we use the same function to make it easy for the callers when
-// they walk the hash table to answer LocalOnly/P2P questions
-//
-mDNSexport mDNSBool LocalOnlyRecordAnswersQuestion(AuthRecord *const ar, const DNSQuestion *const q)
- {
- ResourceRecord *rr = &ar->resrec;
-
- // mDNSInterface_Any questions can be answered with LocalOnly/P2P records in this function. AuthRecord_Any
- // records are handled in ResourceRecordAnswersQuestion/SameNameRecordAnswersQuestion
- if (RRAny(ar))
- {
- LogMsg("LocalOnlyRecordAnswersQuestion: ERROR!! called with regular AuthRecordAny %##s", rr->name->c);
- return mDNSfalse;
- }
-
- // Questions with mDNSInterface_LocalOnly InterfaceID should be answered with all resource records that are
- // *local* to the machine. These include resource records that have InterfaceID set to mDNSInterface_LocalOnly,
- // mDNSInterface_Any and any other real InterfaceID. Hence, LocalOnly questions should not be checked against
- // the InterfaceID in the resource record.
- //
- // mDNSInterface_Unicast does not indicate any scope and hence treat them like mDNSInterface_Any.
-
- if (rr->InterfaceID &&
- q->InterfaceID && q->InterfaceID != mDNSInterface_LocalOnly && q->InterfaceID != mDNSInterface_Unicast &&
- rr->InterfaceID != q->InterfaceID) return(mDNSfalse);
-
- // Entries in /etc/hosts are added as LocalOnly resource records. The LocalOnly resource records
- // may have a scope e.g., fe80::1%en0. The question may be scoped or not: the InterfaceID may be set
- // to mDNSInterface_Any, mDNSInterface_LocalOnly or a real InterfaceID (scoped).
- //
- // 1) Question: Any, LocalOnly Record: no scope. This question should be answered with this record.
- //
- // 2) Question: Any, LocalOnly Record: scoped. This question should be answered with the record because
- // traditionally applications never specify scope e.g., getaddrinfo, but need to be able
- // to get to /etc/hosts entries.
- //
- // 3) Question: Scoped (LocalOnly or InterfaceID), LocalOnly Record: no scope. This is the inverse of (2).
- // If we register a LocalOnly record, we need to answer a LocalOnly question. If the /etc/hosts has a
- // non scoped entry, it may not make sense to answer a scoped question. But we can't tell these two
- // cases apart. As we currently answer LocalOnly question with LocalOnly record, we continue to do so.
- //
- // 4) Question: Scoped (LocalOnly or InterfaceID), LocalOnly Record: scoped. LocalOnly questions should be
- // answered with any resource record where as if it has a valid InterfaceID, the scope should match.
- //
- // (1) and (2) is bypassed because we check for a non-NULL InterfaceID above. For (3), the InterfaceID is NULL
- // and hence bypassed above. For (4) we bypassed LocalOnly questions and checked the scope of the record
- // against the question.
- //
- // For P2P, InterfaceIDs of the question and the record should match.
-
- // If ResourceRecord received via multicast, but question was unicast, then shouldn't use record to answer this question.
- // LocalOnly authoritative answers are exempt. LocalOnly authoritative answers are used for /etc/host entries.
- // We don't want a local process to be able to create a fake LocalOnly address record for "www.bigbank.com" which would then
- // cause other applications (e.g. Safari) to connect to the wrong address. The rpc to register records filters out records
- // with names that don't end in local and have mDNSInterface_LocalOnly set.
- //
- // Note: The check is bypassed for LocalOnly and for P2P it is not needed as only .local records are registered and for
- // a question to match its names, it also has to end in .local and that question can't be a unicast question (See
- // Question_uDNS macro and its usage). As P2P does not enforce .local only registrations we still make this check
- // and also makes it future proof.
-
- if (ar->ARType != AuthRecordLocalOnly && rr->InterfaceID && !mDNSOpaque16IsZero(q->TargetQID)) return(mDNSfalse);
-
- // RR type CNAME matches any query type. QTYPE ANY matches any RR type. QCLASS ANY matches any RR class.
- if (!RRTypeAnswersQuestionType(rr,q->qtype)) return(mDNSfalse);
- if (rr->rrclass != q->qclass && q->qclass != kDNSQClass_ANY) return(mDNSfalse);
-
- return(rr->namehash == q->qnamehash && SameDomainName(rr->name, &q->qname));
- }
-
-mDNSexport mDNSBool AnyTypeRecordAnswersQuestion(const ResourceRecord *const rr, const DNSQuestion *const q)
- {
- // LocalOnly/P2P questions can be answered with AuthRecordAny in this function. LocalOnly/P2P records
- // are handled in LocalOnlyRecordAnswersQuestion
- if ((rr->InterfaceID == mDNSInterface_LocalOnly) || (rr->InterfaceID == mDNSInterface_P2P))
- {
- LogMsg("AnyTypeRecordAnswersQuestion: ERROR!! called with LocalOnly ResourceRecord %p, Question %p", rr->InterfaceID, q->InterfaceID);
- return mDNSfalse;
- }
- if (rr->InterfaceID &&
- q ->InterfaceID && q->InterfaceID != mDNSInterface_LocalOnly &&
- rr->InterfaceID != q->InterfaceID) return(mDNSfalse);
-
- // Resource record received via unicast, the DNSServer entries should match ?
- // Note that Auth Records are normally setup with NULL InterfaceID and
- // both the DNSServers are assumed to be NULL in that case
- if (!rr->InterfaceID && rr->rDNSServer != q->qDNSServer) return(mDNSfalse);
-
- // If ResourceRecord received via multicast, but question was unicast, then shouldn't use record to answer this question
- if (rr->InterfaceID && !mDNSOpaque16IsZero(q->TargetQID)) return(mDNSfalse);
-
- if (rr->rrclass != q->qclass && q->qclass != kDNSQClass_ANY) return(mDNSfalse);
-
- return(rr->namehash == q->qnamehash && SameDomainName(rr->name, &q->qname));
- }
-
-// This is called with both unicast resource record and multicast resource record. The question that
-// received the unicast response could be the regular unicast response from a DNS server or a response
-// to a mDNS QU query. The main reason we need this function is that we can't compare DNSServers between the
-// question and the resource record because the resource record is not completely initialized in
-// mDNSCoreReceiveResponse when this function is called.
-mDNSexport mDNSBool ResourceRecordAnswersUnicastResponse(const ResourceRecord *const rr, const DNSQuestion *const q)
- {
- // For resource records created using multicast, the InterfaceIDs have to match
- if (rr->InterfaceID &&
- q->InterfaceID && rr->InterfaceID != q->InterfaceID) return(mDNSfalse);
-
- // If ResourceRecord received via multicast, but question was unicast, then shouldn't use record to answer this question.
- if (rr->InterfaceID && !mDNSOpaque16IsZero(q->TargetQID)) return(mDNSfalse);
-
- // RR type CNAME matches any query type. QTYPE ANY matches any RR type. QCLASS ANY matches any RR class.
- if (!RRTypeAnswersQuestionType(rr,q->qtype)) return(mDNSfalse);
-
- if (rr->rrclass != q->qclass && q->qclass != kDNSQClass_ANY) return(mDNSfalse);
-
- return(rr->namehash == q->qnamehash && SameDomainName(rr->name, &q->qname));
- }
-
-mDNSexport mDNSu16 GetRDLength(const ResourceRecord *const rr, mDNSBool estimate)
- {
- const RDataBody2 *const rd = (RDataBody2 *)rr->rdata->u.data;
- const domainname *const name = estimate ? rr->name : mDNSNULL;
- if (rr->rrclass == kDNSQClass_ANY) return(rr->rdlength); // Used in update packets to mean "Delete An RRset" (RFC 2136)
- else switch (rr->rrtype)
- {
- case kDNSType_A: return(sizeof(rd->ipv4));
-
- case kDNSType_NS:
- case kDNSType_CNAME:
- case kDNSType_PTR:
- case kDNSType_DNAME:return(CompressedDomainNameLength(&rd->name, name));
-
- case kDNSType_SOA: return(mDNSu16)(CompressedDomainNameLength(&rd->soa.mname, name) +
- CompressedDomainNameLength(&rd->soa.rname, name) +
- 5 * sizeof(mDNSOpaque32));
-
- case kDNSType_NULL:
- case kDNSType_TSIG:
- case kDNSType_TXT:
- case kDNSType_X25:
- case kDNSType_ISDN:
- case kDNSType_LOC:
- case kDNSType_DHCID:return(rr->rdlength); // Not self-describing, so have to just trust rdlength
-
- case kDNSType_HINFO:return(mDNSu16)(2 + (int)rd->data[0] + (int)rd->data[1 + (int)rd->data[0]]);
-
- case kDNSType_MX:
- case kDNSType_AFSDB:
- case kDNSType_RT:
- case kDNSType_KX: return(mDNSu16)(2 + CompressedDomainNameLength(&rd->mx.exchange, name));
-
- case kDNSType_RP: return(mDNSu16)(CompressedDomainNameLength(&rd->rp.mbox, name) +
- CompressedDomainNameLength(&rd->rp.txt, name));
-
- case kDNSType_PX: return(mDNSu16)(2 + CompressedDomainNameLength(&rd->px.map822, name) +
- CompressedDomainNameLength(&rd->px.mapx400, name));
-
- case kDNSType_AAAA: return(sizeof(rd->ipv6));
-
- case kDNSType_SRV: return(mDNSu16)(6 + CompressedDomainNameLength(&rd->srv.target, name));
-
- case kDNSType_OPT: return(rr->rdlength);
-
- case kDNSType_NSEC: {
- int i;
- for (i=sizeof(rdataNSEC); i>0; i--) if (rd->nsec.bitmap[i-1]) break;
- // For our simplified use of NSEC synthetic records:
- // nextname is always the record's own name,
- // and if we have at least one record type that exists,
- // - the block number is always 0,
- // - the count byte is a value in the range 1-32,
- // - followed by the 1-32 data bytes
- return(mDNSu16)((estimate ? 2 : DomainNameLength(rr->name)) + (i ? (2 + i) : 0));
- }
-
- default: debugf("Warning! Don't know how to get length of resource type %d", rr->rrtype);
- return(rr->rdlength);
- }
- }
-
-// When a local client registers (or updates) a record, we use this routine to do some simple validation checks
-// to help reduce the risk of bogus malformed data on the network
-mDNSexport mDNSBool ValidateRData(const mDNSu16 rrtype, const mDNSu16 rdlength, const RData *const rd)
- {
- mDNSu16 len;
-
- switch(rrtype)
- {
- case kDNSType_A: return(rdlength == sizeof(mDNSv4Addr));
-
- case kDNSType_NS: // Same as PTR
- case kDNSType_MD: // Same as PTR
- case kDNSType_MF: // Same as PTR
- case kDNSType_CNAME:// Same as PTR
- //case kDNSType_SOA not checked
- case kDNSType_MB: // Same as PTR
- case kDNSType_MG: // Same as PTR
- case kDNSType_MR: // Same as PTR
- //case kDNSType_NULL not checked (no specified format, so always valid)
- //case kDNSType_WKS not checked
- case kDNSType_PTR: len = DomainNameLengthLimit(&rd->u.name, rd->u.data + rdlength);
- return(len <= MAX_DOMAIN_NAME && rdlength == len);
-
- case kDNSType_HINFO:// Same as TXT (roughly)
- case kDNSType_MINFO:// Same as TXT (roughly)
- case kDNSType_TXT: if (!rdlength) return(mDNSfalse); // TXT record has to be at least one byte (RFC 1035)
- {
- const mDNSu8 *ptr = rd->u.txt.c;
- const mDNSu8 *end = rd->u.txt.c + rdlength;
- while (ptr < end) ptr += 1 + ptr[0];
- return (ptr == end);
- }
-
- case kDNSType_AAAA: return(rdlength == sizeof(mDNSv6Addr));
-
- case kDNSType_MX: // Must be at least two-byte preference, plus domainname
- // Call to DomainNameLengthLimit() implicitly enforces both requirements for us
- len = DomainNameLengthLimit(&rd->u.mx.exchange, rd->u.data + rdlength);
- return(len <= MAX_DOMAIN_NAME && rdlength == 2+len);
-
- case kDNSType_SRV: // Must be at least priority+weight+port, plus domainname
- // Call to DomainNameLengthLimit() implicitly enforces both requirements for us
- len = DomainNameLengthLimit(&rd->u.srv.target, rd->u.data + rdlength);
- return(len <= MAX_DOMAIN_NAME && rdlength == 6+len);
-
- //case kDNSType_NSEC not checked
-
- default: return(mDNStrue); // Allow all other types without checking
- }
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - DNS Message Creation Functions
-#endif
-
-mDNSexport void InitializeDNSMessage(DNSMessageHeader *h, mDNSOpaque16 id, mDNSOpaque16 flags)
- {
- h->id = id;
- h->flags = flags;
- h->numQuestions = 0;
- h->numAnswers = 0;
- h->numAuthorities = 0;
- h->numAdditionals = 0;
- }
-
-mDNSexport const mDNSu8 *FindCompressionPointer(const mDNSu8 *const base, const mDNSu8 *const end, const mDNSu8 *const domname)
- {
- const mDNSu8 *result = end - *domname - 1;
-
- if (*domname == 0) return(mDNSNULL); // There's no point trying to match just the root label
-
- // This loop examines each possible starting position in packet, starting end of the packet and working backwards
- while (result >= base)
- {
- // If the length byte and first character of the label match, then check further to see
- // if this location in the packet will yield a useful name compression pointer.
- if (result[0] == domname[0] && result[1] == domname[1])
- {
- const mDNSu8 *name = domname;
- const mDNSu8 *targ = result;
- while (targ + *name < end)
- {
- // First see if this label matches
- int i;
- const mDNSu8 *pointertarget;
- for (i=0; i <= *name; i++) if (targ[i] != name[i]) break;
- if (i <= *name) break; // If label did not match, bail out
- targ += 1 + *name; // Else, did match, so advance target pointer
- name += 1 + *name; // and proceed to check next label
- if (*name == 0 && *targ == 0) return(result); // If no more labels, we found a match!
- if (*name == 0) break; // If no more labels to match, we failed, so bail out
-
- // The label matched, so now follow the pointer (if appropriate) and then see if the next label matches
- if (targ[0] < 0x40) continue; // If length value, continue to check next label
- if (targ[0] < 0xC0) break; // If 40-BF, not valid
- if (targ+1 >= end) break; // Second byte not present!
- pointertarget = base + (((mDNSu16)(targ[0] & 0x3F)) << 8) + targ[1];
- if (targ < pointertarget) break; // Pointertarget must point *backwards* in the packet
- if (pointertarget[0] >= 0x40) break; // Pointertarget must point to a valid length byte
- targ = pointertarget;
- }
- }
- result--; // We failed to match at this search position, so back up the tentative result pointer and try again
- }
- return(mDNSNULL);
- }
-
-// Put a string of dot-separated labels as length-prefixed labels
-// domainname is a fully-qualified name (i.e. assumed to be ending in a dot, even if it doesn't)
-// msg points to the message we're building (pass mDNSNULL if we don't want to use compression pointers)
-// end points to the end of the message so far
-// ptr points to where we want to put the name
-// limit points to one byte past the end of the buffer that we must not overrun
-// domainname is the name to put
-mDNSexport mDNSu8 *putDomainNameAsLabels(const DNSMessage *const msg,
- mDNSu8 *ptr, const mDNSu8 *const limit, const domainname *const name)
- {
- const mDNSu8 *const base = (const mDNSu8 *)msg;
- const mDNSu8 * np = name->c;
- const mDNSu8 *const max = name->c + MAX_DOMAIN_NAME; // Maximum that's valid
- const mDNSu8 * pointer = mDNSNULL;
- const mDNSu8 *const searchlimit = ptr;
-
- if (!ptr) { LogMsg("putDomainNameAsLabels %##s ptr is null", name->c); return(mDNSNULL); }
-
- if (!*np) // If just writing one-byte root label, make sure we have space for that
- {
- if (ptr >= limit) return(mDNSNULL);
- }
- else // else, loop through writing labels and/or a compression offset
- {
- do {
- if (*np > MAX_DOMAIN_LABEL)
- { LogMsg("Malformed domain name %##s (label more than 63 bytes)", name->c); return(mDNSNULL); }
-
- // This check correctly allows for the final trailing root label:
- // e.g.
- // Suppose our domain name is exactly 256 bytes long, including the final trailing root label.
- // Suppose np is now at name->c[249], and we're about to write our last non-null label ("local").
- // We know that max will be at name->c[256]
- // That means that np + 1 + 5 == max - 1, so we (just) pass the "if" test below, write our
- // six bytes, then exit the loop, write the final terminating root label, and the domain
- // name we've written is exactly 256 bytes long, exactly at the correct legal limit.
- // If the name is one byte longer, then we fail the "if" test below, and correctly bail out.
- if (np + 1 + *np >= max)
- { LogMsg("Malformed domain name %##s (more than 256 bytes)", name->c); return(mDNSNULL); }
-
- if (base) pointer = FindCompressionPointer(base, searchlimit, np);
- if (pointer) // Use a compression pointer if we can
- {
- const mDNSu16 offset = (mDNSu16)(pointer - base);
- if (ptr+2 > limit) return(mDNSNULL); // If we don't have two bytes of space left, give up
- *ptr++ = (mDNSu8)(0xC0 | (offset >> 8));
- *ptr++ = (mDNSu8)( offset & 0xFF);
- return(ptr);
- }
- else // Else copy one label and try again
- {
- int i;
- mDNSu8 len = *np++;
- // If we don't at least have enough space for this label *plus* a terminating zero on the end, give up
- if (ptr + 1 + len >= limit) return(mDNSNULL);
- *ptr++ = len;
- for (i=0; i<len; i++) *ptr++ = *np++;
- }
- } while (*np); // While we've got characters remaining in the name, continue
- }
-
- *ptr++ = 0; // Put the final root label
- return(ptr);
- }
-
-mDNSlocal mDNSu8 *putVal16(mDNSu8 *ptr, mDNSu16 val)
- {
- ptr[0] = (mDNSu8)((val >> 8 ) & 0xFF);
- ptr[1] = (mDNSu8)((val ) & 0xFF);
- return ptr + sizeof(mDNSOpaque16);
- }
-
-mDNSlocal mDNSu8 *putVal32(mDNSu8 *ptr, mDNSu32 val)
- {
- ptr[0] = (mDNSu8)((val >> 24) & 0xFF);
- ptr[1] = (mDNSu8)((val >> 16) & 0xFF);
- ptr[2] = (mDNSu8)((val >> 8) & 0xFF);
- ptr[3] = (mDNSu8)((val ) & 0xFF);
- return ptr + sizeof(mDNSu32);
- }
-
-// msg points to the message we're building (pass mDNSNULL if we don't want to use compression pointers)
-mDNSexport mDNSu8 *putRData(const DNSMessage *const msg, mDNSu8 *ptr, const mDNSu8 *const limit, const ResourceRecord *const rr)
- {
- const RDataBody2 *const rdb = (RDataBody2 *)rr->rdata->u.data;
- switch (rr->rrtype)
- {
- case kDNSType_A: if (rr->rdlength != 4)
- { debugf("putRData: Illegal length %d for kDNSType_A", rr->rdlength); return(mDNSNULL); }
- if (ptr + 4 > limit) return(mDNSNULL);
- *ptr++ = rdb->ipv4.b[0];
- *ptr++ = rdb->ipv4.b[1];
- *ptr++ = rdb->ipv4.b[2];
- *ptr++ = rdb->ipv4.b[3];
- return(ptr);
-
- case kDNSType_NS:
- case kDNSType_CNAME:
- case kDNSType_PTR:
- case kDNSType_DNAME:return(putDomainNameAsLabels(msg, ptr, limit, &rdb->name));
-
- case kDNSType_SOA: ptr = putDomainNameAsLabels(msg, ptr, limit, &rdb->soa.mname);
- if (!ptr) return(mDNSNULL);
- ptr = putDomainNameAsLabels(msg, ptr, limit, &rdb->soa.rname);
- if (!ptr || ptr + 20 > limit) return(mDNSNULL);
- ptr = putVal32(ptr, rdb->soa.serial);
- ptr = putVal32(ptr, rdb->soa.refresh);
- ptr = putVal32(ptr, rdb->soa.retry);
- ptr = putVal32(ptr, rdb->soa.expire);
- ptr = putVal32(ptr, rdb->soa.min);
- return(ptr);
-
- case kDNSType_NULL:
- case kDNSType_HINFO:
- case kDNSType_TSIG:
- case kDNSType_TXT:
- case kDNSType_X25:
- case kDNSType_ISDN:
- case kDNSType_LOC:
- case kDNSType_DHCID:if (ptr + rr->rdlength > limit) return(mDNSNULL);
- mDNSPlatformMemCopy(ptr, rdb->data, rr->rdlength);
- return(ptr + rr->rdlength);
-
- case kDNSType_MX:
- case kDNSType_AFSDB:
- case kDNSType_RT:
- case kDNSType_KX: if (ptr + 3 > limit) return(mDNSNULL);
- ptr = putVal16(ptr, rdb->mx.preference);
- return(putDomainNameAsLabels(msg, ptr, limit, &rdb->mx.exchange));
-
- case kDNSType_RP: ptr = putDomainNameAsLabels(msg, ptr, limit, &rdb->rp.mbox);
- if (!ptr) return(mDNSNULL);
- ptr = putDomainNameAsLabels(msg, ptr, limit, &rdb->rp.txt);
- return(ptr);
-
- case kDNSType_PX: if (ptr + 5 > limit) return(mDNSNULL);
- ptr = putVal16(ptr, rdb->px.preference);
- ptr = putDomainNameAsLabels(msg, ptr, limit, &rdb->px.map822);
- if (!ptr) return(mDNSNULL);
- ptr = putDomainNameAsLabels(msg, ptr, limit, &rdb->px.mapx400);
- return(ptr);
-
- case kDNSType_AAAA: if (rr->rdlength != sizeof(rdb->ipv6))
- { debugf("putRData: Illegal length %d for kDNSType_AAAA", rr->rdlength); return(mDNSNULL); }
- if (ptr + sizeof(rdb->ipv6) > limit) return(mDNSNULL);
- mDNSPlatformMemCopy(ptr, &rdb->ipv6, sizeof(rdb->ipv6));
- return(ptr + sizeof(rdb->ipv6));
-
- case kDNSType_SRV: if (ptr + 7 > limit) return(mDNSNULL);
- *ptr++ = (mDNSu8)(rdb->srv.priority >> 8);
- *ptr++ = (mDNSu8)(rdb->srv.priority & 0xFF);
- *ptr++ = (mDNSu8)(rdb->srv.weight >> 8);
- *ptr++ = (mDNSu8)(rdb->srv.weight & 0xFF);
- *ptr++ = rdb->srv.port.b[0];
- *ptr++ = rdb->srv.port.b[1];
- return(putDomainNameAsLabels(msg, ptr, limit, &rdb->srv.target));
-
- case kDNSType_OPT: {
- int len = 0;
- const rdataOPT *opt;
- const rdataOPT *const end = (const rdataOPT *)&rr->rdata->u.data[rr->rdlength];
- for (opt = &rr->rdata->u.opt[0]; opt < end; opt++) len += DNSOpt_Data_Space(opt);
- if (ptr + len > limit) { LogMsg("ERROR: putOptRData - out of space"); return mDNSNULL; }
-
- for (opt = &rr->rdata->u.opt[0]; opt < end; opt++)
- {
- const int space = DNSOpt_Data_Space(opt);
- ptr = putVal16(ptr, opt->opt);
- ptr = putVal16(ptr, (mDNSu16)space - 4);
- switch (opt->opt)
- {
- case kDNSOpt_LLQ:
- ptr = putVal16(ptr, opt->u.llq.vers);
- ptr = putVal16(ptr, opt->u.llq.llqOp);
- ptr = putVal16(ptr, opt->u.llq.err);
- mDNSPlatformMemCopy(ptr, opt->u.llq.id.b, 8); // 8-byte id
- ptr += 8;
- ptr = putVal32(ptr, opt->u.llq.llqlease);
- break;
- case kDNSOpt_Lease:
- ptr = putVal32(ptr, opt->u.updatelease);
- break;
- case kDNSOpt_Owner:
- *ptr++ = opt->u.owner.vers;
- *ptr++ = opt->u.owner.seq;
- mDNSPlatformMemCopy(ptr, opt->u.owner.HMAC.b, 6); // 6-byte Host identifier
- ptr += 6;
- if (space >= DNSOpt_OwnerData_ID_Wake_Space)
- {
- mDNSPlatformMemCopy(ptr, opt->u.owner.IMAC.b, 6); // 6-byte interface MAC
- ptr += 6;
- if (space > DNSOpt_OwnerData_ID_Wake_Space)
- {
- mDNSPlatformMemCopy(ptr, opt->u.owner.password.b, space - DNSOpt_OwnerData_ID_Wake_Space);
- ptr += space - DNSOpt_OwnerData_ID_Wake_Space;
- }
- }
- break;
- }
- }
- return ptr;
- }
-
- case kDNSType_NSEC: {
- // For our simplified use of NSEC synthetic records:
- // nextname is always the record's own name,
- // the block number is always 0,
- // the count byte is a value in the range 1-32,
- // followed by the 1-32 data bytes
- int i, j;
- for (i=sizeof(rdataNSEC); i>0; i--) if (rdb->nsec.bitmap[i-1]) break;
- ptr = putDomainNameAsLabels(msg, ptr, limit, rr->name);
- if (!ptr) return(mDNSNULL);
- if (i) // Only put a block if at least one type exists for this name
- {
- if (ptr + 2 + i > limit) return(mDNSNULL);
- *ptr++ = 0;
- *ptr++ = (mDNSu8)i;
- for (j=0; j<i; j++) *ptr++ = rdb->nsec.bitmap[j];
- }
- return ptr;
- }
-
- default: debugf("putRData: Warning! Writing unknown resource type %d as raw data", rr->rrtype);
- if (ptr + rr->rdlength > limit) return(mDNSNULL);
- mDNSPlatformMemCopy(ptr, rdb->data, rr->rdlength);
- return(ptr + rr->rdlength);
- }
- }
-
-#define IsUnicastUpdate(X) (!mDNSOpaque16IsZero((X)->h.id) && ((X)->h.flags.b[0] & kDNSFlag0_OP_Mask) == kDNSFlag0_OP_Update)
-
-mDNSexport mDNSu8 *PutResourceRecordTTLWithLimit(DNSMessage *const msg, mDNSu8 *ptr, mDNSu16 *count, ResourceRecord *rr, mDNSu32 ttl, const mDNSu8 *limit)
- {
- mDNSu8 *endofrdata;
- mDNSu16 actualLength;
- // When sending SRV to conventional DNS server (i.e. in DNS update requests) we should not do name compression on the rdata (RFC 2782)
- const DNSMessage *const rdatacompressionbase = (IsUnicastUpdate(msg) && rr->rrtype == kDNSType_SRV) ? mDNSNULL : msg;
-
- if (rr->RecordType == kDNSRecordTypeUnregistered)
- {
- LogMsg("PutResourceRecord ERROR! Attempt to put kDNSRecordTypeUnregistered %##s (%s)", rr->name->c, DNSTypeName(rr->rrtype));
- return(ptr);
- }
-
- if (!ptr) { LogMsg("PutResourceRecordTTLWithLimit ptr is null"); return(mDNSNULL); }
-
- ptr = putDomainNameAsLabels(msg, ptr, limit, rr->name);
- if (!ptr || ptr + 10 >= limit) return(mDNSNULL); // If we're out-of-space, return mDNSNULL
- ptr[0] = (mDNSu8)(rr->rrtype >> 8);
- ptr[1] = (mDNSu8)(rr->rrtype & 0xFF);
- ptr[2] = (mDNSu8)(rr->rrclass >> 8);
- ptr[3] = (mDNSu8)(rr->rrclass & 0xFF);
- ptr[4] = (mDNSu8)((ttl >> 24) & 0xFF);
- ptr[5] = (mDNSu8)((ttl >> 16) & 0xFF);
- ptr[6] = (mDNSu8)((ttl >> 8) & 0xFF);
- ptr[7] = (mDNSu8)( ttl & 0xFF);
- // ptr[8] and ptr[9] filled in *after* we find out how much space the rdata takes
-
- endofrdata = putRData(rdatacompressionbase, ptr+10, limit, rr);
- if (!endofrdata) { verbosedebugf("Ran out of space in PutResourceRecord for %##s (%s)", rr->name->c, DNSTypeName(rr->rrtype)); return(mDNSNULL); }
-
- // Go back and fill in the actual number of data bytes we wrote
- // (actualLength can be less than rdlength when domain name compression is used)
- actualLength = (mDNSu16)(endofrdata - ptr - 10);
- ptr[8] = (mDNSu8)(actualLength >> 8);
- ptr[9] = (mDNSu8)(actualLength & 0xFF);
-
- if (count) (*count)++;
- else LogMsg("PutResourceRecordTTL: ERROR: No target count to update for %##s (%s)", rr->name->c, DNSTypeName(rr->rrtype));
- return(endofrdata);
- }
-
-mDNSlocal mDNSu8 *putEmptyResourceRecord(DNSMessage *const msg, mDNSu8 *ptr, const mDNSu8 *const limit, mDNSu16 *count, const AuthRecord *rr)
- {
- ptr = putDomainNameAsLabels(msg, ptr, limit, rr->resrec.name);
- if (!ptr || ptr + 10 > limit) return(mDNSNULL); // If we're out-of-space, return mDNSNULL
- ptr[0] = (mDNSu8)(rr->resrec.rrtype >> 8); // Put type
- ptr[1] = (mDNSu8)(rr->resrec.rrtype & 0xFF);
- ptr[2] = (mDNSu8)(rr->resrec.rrclass >> 8); // Put class
- ptr[3] = (mDNSu8)(rr->resrec.rrclass & 0xFF);
- ptr[4] = ptr[5] = ptr[6] = ptr[7] = 0; // TTL is zero
- ptr[8] = ptr[9] = 0; // RDATA length is zero
- (*count)++;
- return(ptr + 10);
- }
-
-mDNSexport mDNSu8 *putQuestion(DNSMessage *const msg, mDNSu8 *ptr, const mDNSu8 *const limit, const domainname *const name, mDNSu16 rrtype, mDNSu16 rrclass)
- {
- ptr = putDomainNameAsLabels(msg, ptr, limit, name);
- if (!ptr || ptr+4 >= limit) return(mDNSNULL); // If we're out-of-space, return mDNSNULL
- ptr[0] = (mDNSu8)(rrtype >> 8);
- ptr[1] = (mDNSu8)(rrtype & 0xFF);
- ptr[2] = (mDNSu8)(rrclass >> 8);
- ptr[3] = (mDNSu8)(rrclass & 0xFF);
- msg->h.numQuestions++;
- return(ptr+4);
- }
-
-// for dynamic updates
-mDNSexport mDNSu8 *putZone(DNSMessage *const msg, mDNSu8 *ptr, mDNSu8 *limit, const domainname *zone, mDNSOpaque16 zoneClass)
- {
- ptr = putDomainNameAsLabels(msg, ptr, limit, zone);
- if (!ptr || ptr + 4 > limit) return mDNSNULL; // If we're out-of-space, return NULL
- *ptr++ = (mDNSu8)(kDNSType_SOA >> 8);
- *ptr++ = (mDNSu8)(kDNSType_SOA & 0xFF);
- *ptr++ = zoneClass.b[0];
- *ptr++ = zoneClass.b[1];
- msg->h.mDNS_numZones++;
- return ptr;
- }
-
-// for dynamic updates
-mDNSexport mDNSu8 *putPrereqNameNotInUse(const domainname *const name, DNSMessage *const msg, mDNSu8 *const ptr, mDNSu8 *const end)
- {
- AuthRecord prereq;
- mDNS_SetupResourceRecord(&prereq, mDNSNULL, mDNSInterface_Any, kDNSQType_ANY, kStandardTTL, 0, AuthRecordAny, mDNSNULL, mDNSNULL);
- AssignDomainName(&prereq.namestorage, name);
- prereq.resrec.rrtype = kDNSQType_ANY;
- prereq.resrec.rrclass = kDNSClass_NONE;
- return putEmptyResourceRecord(msg, ptr, end, &msg->h.mDNS_numPrereqs, &prereq);
- }
-
-// for dynamic updates
-mDNSexport mDNSu8 *putDeletionRecord(DNSMessage *msg, mDNSu8 *ptr, ResourceRecord *rr)
- {
- // deletion: specify record w/ TTL 0, class NONE
- const mDNSu16 origclass = rr->rrclass;
- rr->rrclass = kDNSClass_NONE;
- ptr = PutResourceRecordTTLJumbo(msg, ptr, &msg->h.mDNS_numUpdates, rr, 0);
- rr->rrclass = origclass;
- return ptr;
- }
-
-// for dynamic updates
-mDNSexport mDNSu8 *putDeletionRecordWithLimit(DNSMessage *msg, mDNSu8 *ptr, ResourceRecord *rr, mDNSu8 *limit)
- {
- // deletion: specify record w/ TTL 0, class NONE
- const mDNSu16 origclass = rr->rrclass;
- rr->rrclass = kDNSClass_NONE;
- ptr = PutResourceRecordTTLWithLimit(msg, ptr, &msg->h.mDNS_numUpdates, rr, 0, limit);
- rr->rrclass = origclass;
- return ptr;
- }
-
-mDNSexport mDNSu8 *putDeleteRRSetWithLimit(DNSMessage *msg, mDNSu8 *ptr, const domainname *name, mDNSu16 rrtype, mDNSu8 *limit)
- {
- mDNSu16 class = kDNSQClass_ANY;
-
- ptr = putDomainNameAsLabels(msg, ptr, limit, name);
- if (!ptr || ptr + 10 >= limit) return mDNSNULL; // If we're out-of-space, return mDNSNULL
- ptr[0] = (mDNSu8)(rrtype >> 8);
- ptr[1] = (mDNSu8)(rrtype & 0xFF);
- ptr[2] = (mDNSu8)(class >> 8);
- ptr[3] = (mDNSu8)(class & 0xFF);
- ptr[4] = ptr[5] = ptr[6] = ptr[7] = 0; // zero ttl
- ptr[8] = ptr[9] = 0; // zero rdlength/rdata
-
- msg->h.mDNS_numUpdates++;
- return ptr + 10;
- }
-
-// for dynamic updates
-mDNSexport mDNSu8 *putDeleteAllRRSets(DNSMessage *msg, mDNSu8 *ptr, const domainname *name)
- {
- const mDNSu8 *limit = msg->data + AbsoluteMaxDNSMessageData;
- mDNSu16 class = kDNSQClass_ANY;
- mDNSu16 rrtype = kDNSQType_ANY;
-
- ptr = putDomainNameAsLabels(msg, ptr, limit, name);
- if (!ptr || ptr + 10 >= limit) return mDNSNULL; // If we're out-of-space, return mDNSNULL
- ptr[0] = (mDNSu8)(rrtype >> 8);
- ptr[1] = (mDNSu8)(rrtype & 0xFF);
- ptr[2] = (mDNSu8)(class >> 8);
- ptr[3] = (mDNSu8)(class & 0xFF);
- ptr[4] = ptr[5] = ptr[6] = ptr[7] = 0; // zero ttl
- ptr[8] = ptr[9] = 0; // zero rdlength/rdata
-
- msg->h.mDNS_numUpdates++;
- return ptr + 10;
- }
-
-// for dynamic updates
-mDNSexport mDNSu8 *putUpdateLease(DNSMessage *msg, mDNSu8 *end, mDNSu32 lease)
- {
- AuthRecord rr;
- mDNS_SetupResourceRecord(&rr, mDNSNULL, mDNSInterface_Any, kDNSType_OPT, kStandardTTL, kDNSRecordTypeKnownUnique, AuthRecordAny, mDNSNULL, mDNSNULL);
- rr.resrec.rrclass = NormalMaxDNSMessageData;
- rr.resrec.rdlength = sizeof(rdataOPT); // One option in this OPT record
- rr.resrec.rdestimate = sizeof(rdataOPT);
- rr.resrec.rdata->u.opt[0].opt = kDNSOpt_Lease;
- rr.resrec.rdata->u.opt[0].u.updatelease = lease;
- end = PutResourceRecordTTLJumbo(msg, end, &msg->h.numAdditionals, &rr.resrec, 0);
- if (!end) { LogMsg("ERROR: putUpdateLease - PutResourceRecordTTL"); return mDNSNULL; }
- return end;
- }
-
-// for dynamic updates
-mDNSexport mDNSu8 *putUpdateLeaseWithLimit(DNSMessage *msg, mDNSu8 *end, mDNSu32 lease, mDNSu8 *limit)
- {
- AuthRecord rr;
- mDNS_SetupResourceRecord(&rr, mDNSNULL, mDNSInterface_Any, kDNSType_OPT, kStandardTTL, kDNSRecordTypeKnownUnique, AuthRecordAny, mDNSNULL, mDNSNULL);
- rr.resrec.rrclass = NormalMaxDNSMessageData;
- rr.resrec.rdlength = sizeof(rdataOPT); // One option in this OPT record
- rr.resrec.rdestimate = sizeof(rdataOPT);
- rr.resrec.rdata->u.opt[0].opt = kDNSOpt_Lease;
- rr.resrec.rdata->u.opt[0].u.updatelease = lease;
- end = PutResourceRecordTTLWithLimit(msg, end, &msg->h.numAdditionals, &rr.resrec, 0, limit);
- if (!end) { LogMsg("ERROR: putUpdateLease - PutResourceRecordTTLWithLimit"); return mDNSNULL; }
- return end;
- }
-
-mDNSexport mDNSu8 *putHINFO(const mDNS *const m, DNSMessage *const msg, mDNSu8 *end, DomainAuthInfo *authInfo, mDNSu8 *limit)
- {
- if (authInfo && authInfo->AutoTunnel)
- {
- AuthRecord hinfo;
- mDNSu8 *h = hinfo.rdatastorage.u.data;
- mDNSu16 len = 2 + m->HIHardware.c[0] + m->HISoftware.c[0];
- mDNSu8 *newptr;
- mDNS_SetupResourceRecord(&hinfo, mDNSNULL, mDNSInterface_Any, kDNSType_HINFO, 0, kDNSRecordTypeUnique, AuthRecordAny, mDNSNULL, mDNSNULL);
- AppendDomainLabel(&hinfo.namestorage, &m->hostlabel);
- AppendDomainName (&hinfo.namestorage, &authInfo->domain);
- hinfo.resrec.rroriginalttl = 0;
- mDNSPlatformMemCopy(h, &m->HIHardware, 1 + (mDNSu32)m->HIHardware.c[0]);
- h += 1 + (int)h[0];
- mDNSPlatformMemCopy(h, &m->HISoftware, 1 + (mDNSu32)m->HISoftware.c[0]);
- hinfo.resrec.rdlength = len;
- hinfo.resrec.rdestimate = len;
- newptr = PutResourceRecordTTLWithLimit(msg, end, &msg->h.numAdditionals, &hinfo.resrec, 0, limit);
- return newptr;
- }
- else
- return end;
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - DNS Message Parsing Functions
-#endif
-
-mDNSexport mDNSu32 DomainNameHashValue(const domainname *const name)
- {
- mDNSu32 sum = 0;
- const mDNSu8 *c;
-
- for (c = name->c; c[0] != 0 && c[1] != 0; c += 2)
- {
- sum += ((mDNSIsUpperCase(c[0]) ? c[0] + 'a' - 'A' : c[0]) << 8) |
- (mDNSIsUpperCase(c[1]) ? c[1] + 'a' - 'A' : c[1]);
- sum = (sum<<3) | (sum>>29);
- }
- if (c[0]) sum += ((mDNSIsUpperCase(c[0]) ? c[0] + 'a' - 'A' : c[0]) << 8);
- return(sum);
- }
-
-mDNSexport void SetNewRData(ResourceRecord *const rr, RData *NewRData, mDNSu16 rdlength)
- {
- domainname *target;
- if (NewRData)
- {
- rr->rdata = NewRData;
- rr->rdlength = rdlength;
- }
- // Must not try to get target pointer until after updating rr->rdata
- target = GetRRDomainNameTarget(rr);
- rr->rdlength = GetRDLength(rr, mDNSfalse);
- rr->rdestimate = GetRDLength(rr, mDNStrue);
- rr->rdatahash = target ? DomainNameHashValue(target) : RDataHashValue(rr);
- }
-
-mDNSexport const mDNSu8 *skipDomainName(const DNSMessage *const msg, const mDNSu8 *ptr, const mDNSu8 *const end)
- {
- mDNSu16 total = 0;
-
- if (ptr < (mDNSu8*)msg || ptr >= end)
- { debugf("skipDomainName: Illegal ptr not within packet boundaries"); return(mDNSNULL); }
-
- while (1) // Read sequence of labels
- {
- const mDNSu8 len = *ptr++; // Read length of this label
- if (len == 0) return(ptr); // If length is zero, that means this name is complete
- switch (len & 0xC0)
- {
- case 0x00: if (ptr + len >= end) // Remember: expect at least one more byte for the root label
- { debugf("skipDomainName: Malformed domain name (overruns packet end)"); return(mDNSNULL); }
- if (total + 1 + len >= MAX_DOMAIN_NAME) // Remember: expect at least one more byte for the root label
- { debugf("skipDomainName: Malformed domain name (more than 256 characters)"); return(mDNSNULL); }
- ptr += len;
- total += 1 + len;
- break;
-
- case 0x40: debugf("skipDomainName: Extended EDNS0 label types 0x%X not supported", len); return(mDNSNULL);
- case 0x80: debugf("skipDomainName: Illegal label length 0x%X", len); return(mDNSNULL);
- case 0xC0: return(ptr+1);
- }
- }
- }
-
-// Routine to fetch an FQDN from the DNS message, following compression pointers if necessary.
-mDNSexport const mDNSu8 *getDomainName(const DNSMessage *const msg, const mDNSu8 *ptr, const mDNSu8 *const end,
- domainname *const name)
- {
- const mDNSu8 *nextbyte = mDNSNULL; // Record where we got to before we started following pointers
- mDNSu8 *np = name->c; // Name pointer
- const mDNSu8 *const limit = np + MAX_DOMAIN_NAME; // Limit so we don't overrun buffer
-
- if (ptr < (mDNSu8*)msg || ptr >= end)
- { debugf("getDomainName: Illegal ptr not within packet boundaries"); return(mDNSNULL); }
-
- *np = 0; // Tentatively place the root label here (may be overwritten if we have more labels)
-
- while (1) // Read sequence of labels
- {
- const mDNSu8 len = *ptr++; // Read length of this label
- if (len == 0) break; // If length is zero, that means this name is complete
- switch (len & 0xC0)
- {
- int i;
- mDNSu16 offset;
-
- case 0x00: if (ptr + len >= end) // Remember: expect at least one more byte for the root label
- { debugf("getDomainName: Malformed domain name (overruns packet end)"); return(mDNSNULL); }
- if (np + 1 + len >= limit) // Remember: expect at least one more byte for the root label
- { debugf("getDomainName: Malformed domain name (more than 256 characters)"); return(mDNSNULL); }
- *np++ = len;
- for (i=0; i<len; i++) *np++ = *ptr++;
- *np = 0; // Tentatively place the root label here (may be overwritten if we have more labels)
- break;
-
- case 0x40: debugf("getDomainName: Extended EDNS0 label types 0x%X not supported in name %##s", len, name->c);
- return(mDNSNULL);
-
- case 0x80: debugf("getDomainName: Illegal label length 0x%X in domain name %##s", len, name->c); return(mDNSNULL);
-
- case 0xC0: offset = (mDNSu16)((((mDNSu16)(len & 0x3F)) << 8) | *ptr++);
- if (!nextbyte) nextbyte = ptr; // Record where we got to before we started following pointers
- ptr = (mDNSu8 *)msg + offset;
- if (ptr < (mDNSu8*)msg || ptr >= end)
- { debugf("getDomainName: Illegal compression pointer not within packet boundaries"); return(mDNSNULL); }
- if (*ptr & 0xC0)
- { debugf("getDomainName: Compression pointer must point to real label"); return(mDNSNULL); }
- break;
- }
- }
-
- if (nextbyte) return(nextbyte);
- else return(ptr);
- }
-
-mDNSexport const mDNSu8 *skipResourceRecord(const DNSMessage *msg, const mDNSu8 *ptr, const mDNSu8 *end)
- {
- mDNSu16 pktrdlength;
-
- ptr = skipDomainName(msg, ptr, end);
- if (!ptr) { debugf("skipResourceRecord: Malformed RR name"); return(mDNSNULL); }
-
- if (ptr + 10 > end) { debugf("skipResourceRecord: Malformed RR -- no type/class/ttl/len!"); return(mDNSNULL); }
- pktrdlength = (mDNSu16)((mDNSu16)ptr[8] << 8 | ptr[9]);
- ptr += 10;
- if (ptr + pktrdlength > end) { debugf("skipResourceRecord: RDATA exceeds end of packet"); return(mDNSNULL); }
-
- return(ptr + pktrdlength);
- }
-
-mDNSexport const mDNSu8 *GetLargeResourceRecord(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *ptr,
- const mDNSu8 *end, const mDNSInterfaceID InterfaceID, mDNSu8 RecordType, LargeCacheRecord *const largecr)
- {
- CacheRecord *const rr = &largecr->r;
- RDataBody2 *const rdb = (RDataBody2 *)rr->smallrdatastorage.data;
- mDNSu16 pktrdlength;
-
- if (largecr == &m->rec && m->rec.r.resrec.RecordType)
- {
- LogMsg("GetLargeResourceRecord: m->rec appears to be already in use for %s", CRDisplayString(m, &m->rec.r));
-#if ForceAlerts
- *(long*)0 = 0;
-#endif
- }
-
- rr->next = mDNSNULL;
- rr->resrec.name = &largecr->namestorage;
-
- rr->NextInKAList = mDNSNULL;
- rr->TimeRcvd = m ? m->timenow : 0;
- rr->DelayDelivery = 0;
- rr->NextRequiredQuery = m ? m->timenow : 0; // Will be updated to the real value when we call SetNextCacheCheckTimeForRecord()
- rr->LastUsed = m ? m->timenow : 0;
- rr->CRActiveQuestion = mDNSNULL;
- rr->UnansweredQueries = 0;
- rr->LastUnansweredTime= 0;
-#if ENABLE_MULTI_PACKET_QUERY_SNOOPING
- rr->MPUnansweredQ = 0;
- rr->MPLastUnansweredQT= 0;
- rr->MPUnansweredKA = 0;
- rr->MPExpectingKA = mDNSfalse;
-#endif
- rr->NextInCFList = mDNSNULL;
-
- rr->resrec.InterfaceID = InterfaceID;
- rr->resrec.rDNSServer = mDNSNULL;
-
- ptr = getDomainName(msg, ptr, end, &largecr->namestorage); // Will bail out correctly if ptr is NULL
- if (!ptr) { debugf("GetLargeResourceRecord: Malformed RR name"); return(mDNSNULL); }
- rr->resrec.namehash = DomainNameHashValue(rr->resrec.name);
-
- if (ptr + 10 > end) { debugf("GetLargeResourceRecord: Malformed RR -- no type/class/ttl/len!"); return(mDNSNULL); }
-
- rr->resrec.rrtype = (mDNSu16) ((mDNSu16)ptr[0] << 8 | ptr[1]);
- rr->resrec.rrclass = (mDNSu16)(((mDNSu16)ptr[2] << 8 | ptr[3]) & kDNSClass_Mask);
- rr->resrec.rroriginalttl = (mDNSu32) ((mDNSu32)ptr[4] << 24 | (mDNSu32)ptr[5] << 16 | (mDNSu32)ptr[6] << 8 | ptr[7]);
- if (rr->resrec.rroriginalttl > 0x70000000UL / mDNSPlatformOneSecond && (mDNSs32)rr->resrec.rroriginalttl != -1)
- rr->resrec.rroriginalttl = 0x70000000UL / mDNSPlatformOneSecond;
- // Note: We don't have to adjust m->NextCacheCheck here -- this is just getting a record into memory for
- // us to look at. If we decide to copy it into the cache, then we'll update m->NextCacheCheck accordingly.
- pktrdlength = (mDNSu16)((mDNSu16)ptr[8] << 8 | ptr[9]);
-
- // If mDNS record has cache-flush bit set, we mark it unique
- // For uDNS records, all are implicitly deemed unique (a single DNS server is always
- // authoritative for the entire RRSet), unless this is a truncated response
- if (ptr[2] & (kDNSClass_UniqueRRSet >> 8) || (!InterfaceID && !(msg->h.flags.b[0] & kDNSFlag0_TC)))
- RecordType |= kDNSRecordTypePacketUniqueMask;
- ptr += 10;
- if (ptr + pktrdlength > end) { debugf("GetLargeResourceRecord: RDATA exceeds end of packet"); return(mDNSNULL); }
- end = ptr + pktrdlength; // Adjust end to indicate the end of the rdata for this resource record
-
- rr->resrec.rdata = (RData*)&rr->smallrdatastorage;
- rr->resrec.rdata->MaxRDLength = MaximumRDSize;
-
- if (!RecordType) LogMsg("GetLargeResourceRecord: No RecordType for %##s", rr->resrec.name->c);
-
- // IMPORTANT: Any record type we understand and unpack into a structure containing domainnames needs to have corresponding
- // cases in SameRDataBody() and RDataHashValue() to do a semantic comparison (or checksum) of the structure instead of a blind
- // bitwise memory compare (or sum). This is because a domainname is a fixed size structure holding variable-length data.
- // Any bytes past the logical end of the name are undefined, and a blind bitwise memory compare may indicate that
- // two domainnames are different when semantically they are the same name and it's only the unused bytes that differ.
- if (rr->resrec.rrclass == kDNSQClass_ANY && pktrdlength == 0) // Used in update packets to mean "Delete An RRset" (RFC 2136)
- rr->resrec.rdlength = 0;
- else switch (rr->resrec.rrtype)
- {
- case kDNSType_A: if (pktrdlength != sizeof(mDNSv4Addr)) goto fail;
- rdb->ipv4.b[0] = ptr[0];
- rdb->ipv4.b[1] = ptr[1];
- rdb->ipv4.b[2] = ptr[2];
- rdb->ipv4.b[3] = ptr[3];
- break;
-
- case kDNSType_NS:
- case kDNSType_CNAME:
- case kDNSType_PTR:
- case kDNSType_DNAME:ptr = getDomainName(msg, ptr, end, &rdb->name);
- if (ptr != end) { debugf("GetLargeResourceRecord: Malformed CNAME/PTR RDATA name"); goto fail; }
- //debugf("%##s PTR %##s rdlen %d", rr->resrec.name.c, rdb->name.c, pktrdlength);
- break;
-
- case kDNSType_SOA: ptr = getDomainName(msg, ptr, end, &rdb->soa.mname);
- if (!ptr) { debugf("GetLargeResourceRecord: Malformed SOA RDATA mname"); goto fail; }
- ptr = getDomainName(msg, ptr, end, &rdb->soa.rname);
- if (!ptr) { debugf("GetLargeResourceRecord: Malformed SOA RDATA rname"); goto fail; }
- if (ptr + 0x14 != end) { debugf("GetLargeResourceRecord: Malformed SOA RDATA"); goto fail; }
- rdb->soa.serial = (mDNSs32) ((mDNSs32)ptr[0x00] << 24 | (mDNSs32)ptr[0x01] << 16 | (mDNSs32)ptr[0x02] << 8 | ptr[0x03]);
- rdb->soa.refresh = (mDNSu32) ((mDNSu32)ptr[0x04] << 24 | (mDNSu32)ptr[0x05] << 16 | (mDNSu32)ptr[0x06] << 8 | ptr[0x07]);
- rdb->soa.retry = (mDNSu32) ((mDNSu32)ptr[0x08] << 24 | (mDNSu32)ptr[0x09] << 16 | (mDNSu32)ptr[0x0A] << 8 | ptr[0x0B]);
- rdb->soa.expire = (mDNSu32) ((mDNSu32)ptr[0x0C] << 24 | (mDNSu32)ptr[0x0D] << 16 | (mDNSu32)ptr[0x0E] << 8 | ptr[0x0F]);
- rdb->soa.min = (mDNSu32) ((mDNSu32)ptr[0x10] << 24 | (mDNSu32)ptr[0x11] << 16 | (mDNSu32)ptr[0x12] << 8 | ptr[0x13]);
- break;
-
- case kDNSType_NULL:
- case kDNSType_HINFO:
- case kDNSType_TSIG:
- case kDNSType_TXT:
- case kDNSType_X25:
- case kDNSType_ISDN:
- case kDNSType_LOC:
- case kDNSType_DHCID:if (pktrdlength > rr->resrec.rdata->MaxRDLength)
- {
- debugf("GetLargeResourceRecord: %s rdata size (%d) exceeds storage (%d)",
- DNSTypeName(rr->resrec.rrtype), pktrdlength, rr->resrec.rdata->MaxRDLength);
- goto fail;
- }
- rr->resrec.rdlength = pktrdlength;
- mDNSPlatformMemCopy(rdb->data, ptr, pktrdlength);
- break;
-
- case kDNSType_MX:
- case kDNSType_AFSDB:
- case kDNSType_RT:
- case kDNSType_KX: if (pktrdlength < 3) goto fail; // Preference + domainname
- rdb->mx.preference = (mDNSu16)((mDNSu16)ptr[0] << 8 | ptr[1]);
- ptr = getDomainName(msg, ptr+2, end, &rdb->mx.exchange);
- if (ptr != end) { debugf("GetLargeResourceRecord: Malformed MX name"); goto fail; }
- //debugf("%##s SRV %##s rdlen %d", rr->resrec.name.c, rdb->srv.target.c, pktrdlength);
- break;
-
- case kDNSType_RP: ptr = getDomainName(msg, ptr, end, &rdb->rp.mbox); // Domainname + domainname
- if (!ptr) { debugf("GetLargeResourceRecord: Malformed RP mbox"); goto fail; }
- ptr = getDomainName(msg, ptr, end, &rdb->rp.txt);
- if (ptr != end) { debugf("GetLargeResourceRecord: Malformed RP txt"); goto fail; }
- break;
-
- case kDNSType_PX: if (pktrdlength < 4) goto fail; // Preference + domainname + domainname
- rdb->px.preference = (mDNSu16)((mDNSu16)ptr[0] << 8 | ptr[1]);
- ptr = getDomainName(msg, ptr, end, &rdb->px.map822);
- if (!ptr) { debugf("GetLargeResourceRecord: Malformed PX map822"); goto fail; }
- ptr = getDomainName(msg, ptr, end, &rdb->px.mapx400);
- if (ptr != end) { debugf("GetLargeResourceRecord: Malformed PX mapx400"); goto fail; }
- break;
-
- case kDNSType_AAAA: if (pktrdlength != sizeof(mDNSv6Addr)) goto fail;
- mDNSPlatformMemCopy(&rdb->ipv6, ptr, sizeof(rdb->ipv6));
- break;
-
- case kDNSType_SRV: if (pktrdlength < 7) goto fail; // Priority + weight + port + domainname
- rdb->srv.priority = (mDNSu16)((mDNSu16)ptr[0] << 8 | ptr[1]);
- rdb->srv.weight = (mDNSu16)((mDNSu16)ptr[2] << 8 | ptr[3]);
- rdb->srv.port.b[0] = ptr[4];
- rdb->srv.port.b[1] = ptr[5];
- ptr = getDomainName(msg, ptr+6, end, &rdb->srv.target);
- if (ptr != end) { debugf("GetLargeResourceRecord: Malformed SRV RDATA name"); goto fail; }
- //debugf("%##s SRV %##s rdlen %d", rr->resrec.name.c, rdb->srv.target.c, pktrdlength);
- break;
-
- case kDNSType_OPT: {
- rdataOPT *opt = rr->resrec.rdata->u.opt;
- rr->resrec.rdlength = 0;
- while (ptr < end && (mDNSu8 *)(opt+1) < &rr->resrec.rdata->u.data[MaximumRDSize])
- {
- const rdataOPT *const currentopt = opt;
- if (ptr + 4 > end) { LogInfo("GetLargeResourceRecord: OPT RDATA ptr + 4 > end"); goto fail; }
- opt->opt = (mDNSu16)((mDNSu16)ptr[0] << 8 | ptr[1]);
- opt->optlen = (mDNSu16)((mDNSu16)ptr[2] << 8 | ptr[3]);
- ptr += 4;
- if (ptr + opt->optlen > end) { LogInfo("GetLargeResourceRecord: ptr + opt->optlen > end"); goto fail; }
- switch (opt->opt)
- {
- case kDNSOpt_LLQ:
- if (opt->optlen == DNSOpt_LLQData_Space - 4)
- {
- opt->u.llq.vers = (mDNSu16)((mDNSu16)ptr[0] << 8 | ptr[1]);
- opt->u.llq.llqOp = (mDNSu16)((mDNSu16)ptr[2] << 8 | ptr[3]);
- opt->u.llq.err = (mDNSu16)((mDNSu16)ptr[4] << 8 | ptr[5]);
- mDNSPlatformMemCopy(opt->u.llq.id.b, ptr+6, 8);
- opt->u.llq.llqlease = (mDNSu32) ((mDNSu32)ptr[14] << 24 | (mDNSu32)ptr[15] << 16 | (mDNSu32)ptr[16] << 8 | ptr[17]);
- if (opt->u.llq.llqlease > 0x70000000UL / mDNSPlatformOneSecond)
- opt->u.llq.llqlease = 0x70000000UL / mDNSPlatformOneSecond;
- opt++;
- }
- break;
- case kDNSOpt_Lease:
- if (opt->optlen == DNSOpt_LeaseData_Space - 4)
- {
- opt->u.updatelease = (mDNSu32) ((mDNSu32)ptr[0] << 24 | (mDNSu32)ptr[1] << 16 | (mDNSu32)ptr[2] << 8 | ptr[3]);
- if (opt->u.updatelease > 0x70000000UL / mDNSPlatformOneSecond)
- opt->u.updatelease = 0x70000000UL / mDNSPlatformOneSecond;
- opt++;
- }
- break;
- case kDNSOpt_Owner:
- if (ValidOwnerLength(opt->optlen))
- {
- opt->u.owner.vers = ptr[0];
- opt->u.owner.seq = ptr[1];
- mDNSPlatformMemCopy(opt->u.owner.HMAC.b, ptr+2, 6); // 6-byte MAC address
- mDNSPlatformMemCopy(opt->u.owner.IMAC.b, ptr+2, 6); // 6-byte MAC address
- opt->u.owner.password = zeroEthAddr;
- if (opt->optlen >= DNSOpt_OwnerData_ID_Wake_Space-4)
- {
- mDNSPlatformMemCopy(opt->u.owner.IMAC.b, ptr+8, 6); // 6-byte MAC address
- // This mDNSPlatformMemCopy is safe because the ValidOwnerLength(opt->optlen) check above
- // ensures that opt->optlen is no more than DNSOpt_OwnerData_ID_Wake_PW6_Space - 4
- if (opt->optlen > DNSOpt_OwnerData_ID_Wake_Space-4)
- mDNSPlatformMemCopy(opt->u.owner.password.b, ptr+14, opt->optlen - (DNSOpt_OwnerData_ID_Wake_Space-4));
- }
- opt++;
- }
- break;
- }
- ptr += currentopt->optlen;
- }
- rr->resrec.rdlength = (mDNSu16)((mDNSu8*)opt - rr->resrec.rdata->u.data);
- if (ptr != end) { LogInfo("GetLargeResourceRecord: Malformed OptRdata"); goto fail; }
- break;
- }
-
- case kDNSType_NSEC: {
- unsigned int i, j;
- domainname d;
- ptr = getDomainName(msg, ptr, end, &d); // Ignored for our simplified use of NSEC synthetic records
- if (!ptr) { LogInfo("GetLargeResourceRecord: Malformed NSEC nextname"); goto fail; }
- mDNSPlatformMemZero(rdb->nsec.bitmap, sizeof(rdb->nsec.bitmap));
- if (ptr < end)
- {
- if (*ptr++ != 0) { debugf("GetLargeResourceRecord: We only handle block zero NSECs"); goto fail; }
- i = *ptr++;
- if (i > sizeof(rdataNSEC)) { debugf("GetLargeResourceRecord: invalid block length %d", i); goto fail; }
- for (j=0; j<i; j++) rdb->nsec.bitmap[j] = *ptr++;
- }
- if (ptr != end) { debugf("GetLargeResourceRecord: Malformed NSEC"); goto fail; }
- break;
- }
-
- default: if (pktrdlength > rr->resrec.rdata->MaxRDLength)
- {
- debugf("GetLargeResourceRecord: rdata %d (%s) size (%d) exceeds storage (%d)",
- rr->resrec.rrtype, DNSTypeName(rr->resrec.rrtype), pktrdlength, rr->resrec.rdata->MaxRDLength);
- goto fail;
- }
- debugf("GetLargeResourceRecord: Warning! Reading resource type %d (%s) as opaque data",
- rr->resrec.rrtype, DNSTypeName(rr->resrec.rrtype));
- // Note: Just because we don't understand the record type, that doesn't
- // mean we fail. The DNS protocol specifies rdlength, so we can
- // safely skip over unknown records and ignore them.
- // We also grab a binary copy of the rdata anyway, since the caller
- // might know how to interpret it even if we don't.
- rr->resrec.rdlength = pktrdlength;
- mDNSPlatformMemCopy(rdb->data, ptr, pktrdlength);
- break;
- }
-
- SetNewRData(&rr->resrec, mDNSNULL, 0); // Sets rdlength, rdestimate, rdatahash for us
-
- // Success! Now fill in RecordType to show this record contains valid data
- rr->resrec.RecordType = RecordType;
- return(end);
-
-fail:
- // If we were unable to parse the rdata in this record, we indicate that by
- // returing a 'kDNSRecordTypePacketNegative' record with rdlength set to zero
- rr->resrec.RecordType = kDNSRecordTypePacketNegative;
- rr->resrec.rdlength = 0;
- rr->resrec.rdestimate = 0;
- rr->resrec.rdatahash = 0;
- return(end);
- }
-
-mDNSexport const mDNSu8 *skipQuestion(const DNSMessage *msg, const mDNSu8 *ptr, const mDNSu8 *end)
- {
- ptr = skipDomainName(msg, ptr, end);
- if (!ptr) { debugf("skipQuestion: Malformed domain name in DNS question section"); return(mDNSNULL); }
- if (ptr+4 > end) { debugf("skipQuestion: Malformed DNS question section -- no query type and class!"); return(mDNSNULL); }
- return(ptr+4);
- }
-
-mDNSexport const mDNSu8 *getQuestion(const DNSMessage *msg, const mDNSu8 *ptr, const mDNSu8 *end, const mDNSInterfaceID InterfaceID,
- DNSQuestion *question)
- {
- mDNSPlatformMemZero(question, sizeof(*question));
- question->InterfaceID = InterfaceID;
- if (!InterfaceID) question->TargetQID = onesID; // In DNSQuestions we use TargetQID as the indicator of whether it's unicast or multicast
- ptr = getDomainName(msg, ptr, end, &question->qname);
- if (!ptr) { debugf("Malformed domain name in DNS question section"); return(mDNSNULL); }
- if (ptr+4 > end) { debugf("Malformed DNS question section -- no query type and class!"); return(mDNSNULL); }
-
- question->qnamehash = DomainNameHashValue(&question->qname);
- question->qtype = (mDNSu16)((mDNSu16)ptr[0] << 8 | ptr[1]); // Get type
- question->qclass = (mDNSu16)((mDNSu16)ptr[2] << 8 | ptr[3]); // and class
- return(ptr+4);
- }
-
-mDNSexport const mDNSu8 *LocateAnswers(const DNSMessage *const msg, const mDNSu8 *const end)
- {
- int i;
- const mDNSu8 *ptr = msg->data;
- for (i = 0; i < msg->h.numQuestions && ptr; i++) ptr = skipQuestion(msg, ptr, end);
- return(ptr);
- }
-
-mDNSexport const mDNSu8 *LocateAuthorities(const DNSMessage *const msg, const mDNSu8 *const end)
- {
- int i;
- const mDNSu8 *ptr = LocateAnswers(msg, end);
- for (i = 0; i < msg->h.numAnswers && ptr; i++) ptr = skipResourceRecord(msg, ptr, end);
- return(ptr);
- }
-
-mDNSexport const mDNSu8 *LocateAdditionals(const DNSMessage *const msg, const mDNSu8 *const end)
- {
- int i;
- const mDNSu8 *ptr = LocateAuthorities(msg, end);
- for (i = 0; i < msg->h.numAuthorities; i++) ptr = skipResourceRecord(msg, ptr, end);
- return (ptr);
- }
-
-mDNSexport const mDNSu8 *LocateOptRR(const DNSMessage *const msg, const mDNSu8 *const end, int minsize)
- {
- int i;
- const mDNSu8 *ptr = LocateAdditionals(msg, end);
-
- // Locate the OPT record.
- // According to RFC 2671, "One OPT pseudo-RR can be added to the additional data section of either a request or a response."
- // This implies that there may be *at most* one OPT record per DNS message, in the Additional Section,
- // but not necessarily the *last* entry in the Additional Section.
- for (i = 0; ptr && i < msg->h.numAdditionals; i++)
- {
- if (ptr + DNSOpt_Header_Space + minsize <= end && // Make sure we have 11+minsize bytes of data
- ptr[0] == 0 && // Name must be root label
- ptr[1] == (kDNSType_OPT >> 8 ) && // rrtype OPT
- ptr[2] == (kDNSType_OPT & 0xFF) &&
- ((mDNSu16)ptr[9] << 8 | (mDNSu16)ptr[10]) >= (mDNSu16)minsize)
- return(ptr);
- else
- ptr = skipResourceRecord(msg, ptr, end);
- }
- return(mDNSNULL);
- }
-
-// On success, GetLLQOptData returns pointer to storage within shared "m->rec";
-// it is caller's responsibilty to clear m->rec.r.resrec.RecordType after use
-// Note: An OPT RDataBody actually contains one or more variable-length rdataOPT objects packed together
-// The code that currently calls this assumes there's only one, instead of iterating through the set
-mDNSexport const rdataOPT *GetLLQOptData(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *const end)
- {
- const mDNSu8 *ptr = LocateOptRR(msg, end, DNSOpt_LLQData_Space);
- if (ptr)
- {
- ptr = GetLargeResourceRecord(m, msg, ptr, end, 0, kDNSRecordTypePacketAdd, &m->rec);
- if (ptr && m->rec.r.resrec.RecordType != kDNSRecordTypePacketNegative) return(&m->rec.r.resrec.rdata->u.opt[0]);
- }
- return(mDNSNULL);
- }
-
-// Get the lease life of records in a dynamic update
-// returns 0 on error or if no lease present
-mDNSexport mDNSu32 GetPktLease(mDNS *m, DNSMessage *msg, const mDNSu8 *end)
- {
- mDNSu32 result = 0;
- const mDNSu8 *ptr = LocateOptRR(msg, end, DNSOpt_LeaseData_Space);
- if (ptr) ptr = GetLargeResourceRecord(m, msg, ptr, end, 0, kDNSRecordTypePacketAdd, &m->rec);
- if (ptr && m->rec.r.resrec.rdlength >= DNSOpt_LeaseData_Space && m->rec.r.resrec.rdata->u.opt[0].opt == kDNSOpt_Lease)
- result = m->rec.r.resrec.rdata->u.opt[0].u.updatelease;
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
- return(result);
- }
-
-mDNSlocal const mDNSu8 *DumpRecords(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *ptr, const mDNSu8 *const end, int count, char *label)
- {
- int i;
- LogMsg("%2d %s", count, label);
- for (i = 0; i < count && ptr; i++)
- {
- // This puts a LargeCacheRecord on the stack instead of using the shared m->rec storage,
- // but since it's only used for debugging (and probably only on OS X, not on
- // embedded systems) putting a 9kB object on the stack isn't a big problem.
- LargeCacheRecord largecr;
- ptr = GetLargeResourceRecord(m, msg, ptr, end, mDNSInterface_Any, kDNSRecordTypePacketAns, &largecr);
- if (ptr) LogMsg("%2d TTL%8d %s", i, largecr.r.resrec.rroriginalttl, CRDisplayString(m, &largecr.r));
- }
- if (!ptr) LogMsg("ERROR: Premature end of packet data");
- return(ptr);
- }
-
-#define DNS_OP_Name(X) ( \
- (X) == kDNSFlag0_OP_StdQuery ? "" : \
- (X) == kDNSFlag0_OP_Iquery ? "Iquery " : \
- (X) == kDNSFlag0_OP_Status ? "Status " : \
- (X) == kDNSFlag0_OP_Unused3 ? "Unused3 " : \
- (X) == kDNSFlag0_OP_Notify ? "Notify " : \
- (X) == kDNSFlag0_OP_Update ? "Update " : "?? " )
-
-#define DNS_RC_Name(X) ( \
- (X) == kDNSFlag1_RC_NoErr ? "NoErr" : \
- (X) == kDNSFlag1_RC_FormErr ? "FormErr" : \
- (X) == kDNSFlag1_RC_ServFail ? "ServFail" : \
- (X) == kDNSFlag1_RC_NXDomain ? "NXDomain" : \
- (X) == kDNSFlag1_RC_NotImpl ? "NotImpl" : \
- (X) == kDNSFlag1_RC_Refused ? "Refused" : \
- (X) == kDNSFlag1_RC_YXDomain ? "YXDomain" : \
- (X) == kDNSFlag1_RC_YXRRSet ? "YXRRSet" : \
- (X) == kDNSFlag1_RC_NXRRSet ? "NXRRSet" : \
- (X) == kDNSFlag1_RC_NotAuth ? "NotAuth" : \
- (X) == kDNSFlag1_RC_NotZone ? "NotZone" : "??" )
-
-// Note: DumpPacket expects the packet header fields in host byte order, not network byte order
-mDNSexport void DumpPacket(mDNS *const m, mStatus status, mDNSBool sent, char *transport,
- const mDNSAddr *srcaddr, mDNSIPPort srcport,
- const mDNSAddr *dstaddr, mDNSIPPort dstport, const DNSMessage *const msg, const mDNSu8 *const end)
- {
- mDNSBool IsUpdate = ((msg->h.flags.b[0] & kDNSFlag0_OP_Mask) == kDNSFlag0_OP_Update);
- const mDNSu8 *ptr = msg->data;
- int i;
- DNSQuestion q;
- char tbuffer[64], sbuffer[64], dbuffer[64] = "";
- if (!status) tbuffer[mDNS_snprintf(tbuffer, sizeof(tbuffer), sent ? "Sent" : "Received" )] = 0;
- else tbuffer[mDNS_snprintf(tbuffer, sizeof(tbuffer), "ERROR %d %sing", status, sent ? "Send" : "Receiv")] = 0;
- if (sent) sbuffer[mDNS_snprintf(sbuffer, sizeof(sbuffer), "port " )] = 0;
- else sbuffer[mDNS_snprintf(sbuffer, sizeof(sbuffer), "%#a:", srcaddr)] = 0;
- if (dstaddr || !mDNSIPPortIsZero(dstport))
- dbuffer[mDNS_snprintf(dbuffer, sizeof(dbuffer), " to %#a:%d", dstaddr, mDNSVal16(dstport))] = 0;
-
- LogMsg("-- %s %s DNS %s%s (flags %02X%02X) RCODE: %s (%d) %s%s%s%s%s%sID: %d %d bytes from %s%d%s%s --",
- tbuffer, transport,
- DNS_OP_Name(msg->h.flags.b[0] & kDNSFlag0_OP_Mask),
- msg->h.flags.b[0] & kDNSFlag0_QR_Response ? "Response" : "Query",
- msg->h.flags.b[0], msg->h.flags.b[1],
- DNS_RC_Name(msg->h.flags.b[1] & kDNSFlag1_RC_Mask),
- msg->h.flags.b[1] & kDNSFlag1_RC_Mask,
- msg->h.flags.b[0] & kDNSFlag0_AA ? "AA " : "",
- msg->h.flags.b[0] & kDNSFlag0_TC ? "TC " : "",
- msg->h.flags.b[0] & kDNSFlag0_RD ? "RD " : "",
- msg->h.flags.b[1] & kDNSFlag1_RA ? "RA " : "",
- msg->h.flags.b[1] & kDNSFlag1_AD ? "AD " : "",
- msg->h.flags.b[1] & kDNSFlag1_CD ? "CD " : "",
- mDNSVal16(msg->h.id),
- end - msg->data,
- sbuffer, mDNSVal16(srcport), dbuffer,
- (msg->h.flags.b[0] & kDNSFlag0_TC) ? " (truncated)" : ""
- );
-
- LogMsg("%2d %s", msg->h.numQuestions, IsUpdate ? "Zone" : "Questions");
- for (i = 0; i < msg->h.numQuestions && ptr; i++)
- {
- ptr = getQuestion(msg, ptr, end, mDNSInterface_Any, &q);
- if (ptr) LogMsg("%2d %##s %s", i, q.qname.c, DNSTypeName(q.qtype));
- }
- ptr = DumpRecords(m, msg, ptr, end, msg->h.numAnswers, IsUpdate ? "Prerequisites" : "Answers");
- ptr = DumpRecords(m, msg, ptr, end, msg->h.numAuthorities, IsUpdate ? "Updates" : "Authorities");
- ptr = DumpRecords(m, msg, ptr, end, msg->h.numAdditionals, "Additionals");
- LogMsg("--------------");
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - Packet Sending Functions
-#endif
-
-// Stub definition of TCPSocket_struct so we can access flags field. (Rest of TCPSocket_struct is platform-dependent.)
-struct TCPSocket_struct { TCPSocketFlags flags; /* ... */ };
-
-struct UDPSocket_struct
- {
- mDNSIPPort port; // MUST BE FIRST FIELD -- mDNSCoreReceive expects every UDPSocket_struct to begin with mDNSIPPort port
- };
-
-// Note: When we sign a DNS message using DNSDigest_SignMessage(), the current real-time clock value is used, which
-// is why we generally defer signing until we send the message, to ensure the signature is as fresh as possible.
-mDNSexport mStatus mDNSSendDNSMessage(mDNS *const m, DNSMessage *const msg, mDNSu8 *end,
- mDNSInterfaceID InterfaceID, UDPSocket *src, const mDNSAddr *dst, mDNSIPPort dstport, TCPSocket *sock, DomainAuthInfo *authInfo)
- {
- mStatus status = mStatus_NoError;
- const mDNSu16 numAdditionals = msg->h.numAdditionals;
- mDNSu8 *newend;
- mDNSu8 *limit = msg->data + AbsoluteMaxDNSMessageData;
-
- // Zero-length message data is okay (e.g. for a DNS Update ack, where all we need is an ID and an error code
- if (end < msg->data || end - msg->data > AbsoluteMaxDNSMessageData)
- {
- LogMsg("mDNSSendDNSMessage: invalid message %p %p %d", msg->data, end, end - msg->data);
- return mStatus_BadParamErr;
- }
-
- newend = putHINFO(m, msg, end, authInfo, limit);
- if (!newend) LogMsg("mDNSSendDNSMessage: putHINFO failed msg %p end %p, limit %p", msg->data, end, limit); // Not fatal
- else end = newend;
-
- // Put all the integer values in IETF byte-order (MSB first, LSB second)
- SwapDNSHeaderBytes(msg);
-
- if (authInfo) DNSDigest_SignMessage(msg, &end, authInfo, 0); // DNSDigest_SignMessage operates on message in network byte order
- if (!end) { LogMsg("mDNSSendDNSMessage: DNSDigest_SignMessage failed"); status = mStatus_NoMemoryErr; }
- else
- {
- // Send the packet on the wire
- if (!sock)
- status = mDNSPlatformSendUDP(m, msg, end, InterfaceID, src, dst, dstport);
- else
- {
- mDNSu16 msglen = (mDNSu16)(end - (mDNSu8 *)msg);
- mDNSu8 lenbuf[2] = { (mDNSu8)(msglen >> 8), (mDNSu8)(msglen & 0xFF) };
- long nsent = mDNSPlatformWriteTCP(sock, (char*)lenbuf, 2); // Should do scatter/gather here -- this is probably going out as two packets
- if (nsent != 2) { LogMsg("mDNSSendDNSMessage: write msg length failed %d/%d", nsent, 2); status = mStatus_ConnFailed; }
- else
- {
- nsent = mDNSPlatformWriteTCP(sock, (char *)msg, msglen);
- if (nsent != msglen) { LogMsg("mDNSSendDNSMessage: write msg body failed %d/%d", nsent, msglen); status = mStatus_ConnFailed; }
- }
- }
- }
-
- // Swap the integer values back the way they were (remember that numAdditionals may have been changed by putHINFO and/or SignMessage)
- SwapDNSHeaderBytes(msg);
-
- // Dump the packet with the HINFO and TSIG
- if (mDNS_PacketLoggingEnabled && !mDNSOpaque16IsZero(msg->h.id))
- DumpPacket(m, status, mDNStrue, sock && (sock->flags & kTCPSocketFlags_UseTLS) ? "TLS" : sock ? "TCP" : "UDP", mDNSNULL, src ? src->port : MulticastDNSPort, dst, dstport, msg, end);
-
- // put the number of additionals back the way it was
- msg->h.numAdditionals = numAdditionals;
-
- return(status);
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - RR List Management & Task Management
-#endif
-
-mDNSexport void mDNS_Lock_(mDNS *const m, const char * const functionname)
- {
- // MUST grab the platform lock FIRST!
- mDNSPlatformLock(m);
-
- // Normally, mDNS_reentrancy is zero and so is mDNS_busy
- // However, when we call a client callback mDNS_busy is one, and we increment mDNS_reentrancy too
- // If that client callback does mDNS API calls, mDNS_reentrancy and mDNS_busy will both be one
- // If mDNS_busy != mDNS_reentrancy that's a bad sign
- if (m->mDNS_busy != m->mDNS_reentrancy)
- {
- LogMsg("%s: mDNS_Lock: Locking failure! mDNS_busy (%ld) != mDNS_reentrancy (%ld)", functionname, m->mDNS_busy, m->mDNS_reentrancy);
-#if ForceAlerts
- *(long*)0 = 0;
-#endif
- }
-
- // If this is an initial entry into the mDNSCore code, set m->timenow
- // else, if this is a re-entrant entry into the mDNSCore code, m->timenow should already be set
- if (m->mDNS_busy == 0)
- {
- if (m->timenow)
- LogMsg("%s: mDNS_Lock: m->timenow already set (%ld/%ld)", functionname, m->timenow, mDNS_TimeNow_NoLock(m));
- m->timenow = mDNS_TimeNow_NoLock(m);
- if (m->timenow == 0) m->timenow = 1;
- }
- else if (m->timenow == 0)
- {
- LogMsg("%s: mDNS_Lock: m->mDNS_busy is %ld but m->timenow not set", functionname, m->mDNS_busy);
- m->timenow = mDNS_TimeNow_NoLock(m);
- if (m->timenow == 0) m->timenow = 1;
- }
-
- if (m->timenow_last - m->timenow > 0)
- {
- m->timenow_adjust += m->timenow_last - m->timenow;
- LogMsg("%s: mDNSPlatformRawTime went backwards by %ld ticks; setting correction factor to %ld", functionname, m->timenow_last - m->timenow, m->timenow_adjust);
- m->timenow = m->timenow_last;
- }
- m->timenow_last = m->timenow;
-
- // Increment mDNS_busy so we'll recognise re-entrant calls
- m->mDNS_busy++;
- }
-
-mDNSlocal AuthRecord *AnyLocalRecordReady(const mDNS *const m)
- {
- AuthRecord *rr;
- for (rr = m->NewLocalRecords; rr; rr = rr->next)
- if (LocalRecordReady(rr)) return rr;
- return mDNSNULL;
- }
-
-mDNSlocal mDNSs32 GetNextScheduledEvent(const mDNS *const m)
- {
- mDNSs32 e = m->timenow + 0x78000000;
- if (m->mDNSPlatformStatus != mStatus_NoError) return(e);
- if (m->NewQuestions)
- {
- if (m->NewQuestions->DelayAnswering) e = m->NewQuestions->DelayAnswering;
- else return(m->timenow);
- }
- if (m->NewLocalOnlyQuestions) return(m->timenow);
- if (m->NewLocalRecords && AnyLocalRecordReady(m)) return(m->timenow);
- if (m->NewLocalOnlyRecords) return(m->timenow);
- if (m->SPSProxyListChanged) return(m->timenow);
- if (m->LocalRemoveEvents) return(m->timenow);
-
-#ifndef UNICAST_DISABLED
- if (e - m->NextuDNSEvent > 0) e = m->NextuDNSEvent;
- if (e - m->NextScheduledNATOp > 0) e = m->NextScheduledNATOp;
- if (m->NextSRVUpdate && e - m->NextSRVUpdate > 0) e = m->NextSRVUpdate;
-#endif
-
- if (e - m->NextCacheCheck > 0) e = m->NextCacheCheck;
- if (e - m->NextScheduledSPS > 0) e = m->NextScheduledSPS;
- // NextScheduledSPRetry only valid when DelaySleep not set
- if (!m->DelaySleep && m->SleepLimit && e - m->NextScheduledSPRetry > 0) e = m->NextScheduledSPRetry;
- if (m->DelaySleep && e - m->DelaySleep > 0) e = m->DelaySleep;
-
- if (m->SuppressSending)
- {
- if (e - m->SuppressSending > 0) e = m->SuppressSending;
- }
- else
- {
- if (e - m->NextScheduledQuery > 0) e = m->NextScheduledQuery;
- if (e - m->NextScheduledProbe > 0) e = m->NextScheduledProbe;
- if (e - m->NextScheduledResponse > 0) e = m->NextScheduledResponse;
- }
- if (e - m->NextScheduledStopTime > 0) e = m->NextScheduledStopTime;
- return(e);
- }
-
-mDNSexport void ShowTaskSchedulingError(mDNS *const m)
- {
- AuthRecord *rr;
- mDNS_Lock(m);
-
- LogMsg("Task Scheduling Error: Continuously busy for more than a second");
-
- // Note: To accurately diagnose *why* we're busy, the debugging code here needs to mirror the logic in GetNextScheduledEvent above
-
- if (m->NewQuestions && (!m->NewQuestions->DelayAnswering || m->timenow - m->NewQuestions->DelayAnswering >= 0))
- LogMsg("Task Scheduling Error: NewQuestion %##s (%s)",
- m->NewQuestions->qname.c, DNSTypeName(m->NewQuestions->qtype));
-
- if (m->NewLocalOnlyQuestions)
- LogMsg("Task Scheduling Error: NewLocalOnlyQuestions %##s (%s)",
- m->NewLocalOnlyQuestions->qname.c, DNSTypeName(m->NewLocalOnlyQuestions->qtype));
-
- if (m->NewLocalRecords)
- {
- rr = AnyLocalRecordReady(m);
- if (rr) LogMsg("Task Scheduling Error: NewLocalRecords %s", ARDisplayString(m, rr));
- }
-
- if (m->NewLocalOnlyRecords) LogMsg("Task Scheduling Error: NewLocalOnlyRecords");
-
- if (m->SPSProxyListChanged) LogMsg("Task Scheduling Error: SPSProxyListChanged");
- if (m->LocalRemoveEvents) LogMsg("Task Scheduling Error: LocalRemoveEvents");
-
- if (m->timenow - m->NextScheduledEvent >= 0)
- LogMsg("Task Scheduling Error: m->NextScheduledEvent %d", m->timenow - m->NextScheduledEvent);
-
-#ifndef UNICAST_DISABLED
- if (m->timenow - m->NextuDNSEvent >= 0)
- LogMsg("Task Scheduling Error: m->NextuDNSEvent %d", m->timenow - m->NextuDNSEvent);
- if (m->timenow - m->NextScheduledNATOp >= 0)
- LogMsg("Task Scheduling Error: m->NextScheduledNATOp %d", m->timenow - m->NextScheduledNATOp);
- if (m->NextSRVUpdate && m->timenow - m->NextSRVUpdate >= 0)
- LogMsg("Task Scheduling Error: m->NextSRVUpdate %d", m->timenow - m->NextSRVUpdate);
-#endif
-
- if (m->timenow - m->NextCacheCheck >= 0)
- LogMsg("Task Scheduling Error: m->NextCacheCheck %d", m->timenow - m->NextCacheCheck);
- if (m->timenow - m->NextScheduledSPS >= 0)
- LogMsg("Task Scheduling Error: m->NextScheduledSPS %d", m->timenow - m->NextScheduledSPS);
- if (!m->DelaySleep && m->SleepLimit && m->timenow - m->NextScheduledSPRetry >= 0)
- LogMsg("Task Scheduling Error: m->NextScheduledSPRetry %d", m->timenow - m->NextScheduledSPRetry);
- if (m->DelaySleep && m->timenow - m->DelaySleep >= 0)
- LogMsg("Task Scheduling Error: m->DelaySleep %d", m->timenow - m->DelaySleep);
-
- if (m->SuppressSending && m->timenow - m->SuppressSending >= 0)
- LogMsg("Task Scheduling Error: m->SuppressSending %d", m->timenow - m->SuppressSending);
- if (m->timenow - m->NextScheduledQuery >= 0)
- LogMsg("Task Scheduling Error: m->NextScheduledQuery %d", m->timenow - m->NextScheduledQuery);
- if (m->timenow - m->NextScheduledProbe >= 0)
- LogMsg("Task Scheduling Error: m->NextScheduledProbe %d", m->timenow - m->NextScheduledProbe);
- if (m->timenow - m->NextScheduledResponse >= 0)
- LogMsg("Task Scheduling Error: m->NextScheduledResponse %d", m->timenow - m->NextScheduledResponse);
-
- mDNS_Unlock(m);
- }
-
-mDNSexport void mDNS_Unlock_(mDNS *const m, const char * const functionname)
- {
- // Decrement mDNS_busy
- m->mDNS_busy--;
-
- // Check for locking failures
- if (m->mDNS_busy != m->mDNS_reentrancy)
- {
- LogMsg("%s: mDNS_Unlock: Locking failure! mDNS_busy (%ld) != mDNS_reentrancy (%ld)", functionname, m->mDNS_busy, m->mDNS_reentrancy);
-#if ForceAlerts
- *(long*)0 = 0;
-#endif
- }
-
- // If this is a final exit from the mDNSCore code, set m->NextScheduledEvent and clear m->timenow
- if (m->mDNS_busy == 0)
- {
- m->NextScheduledEvent = GetNextScheduledEvent(m);
- if (m->timenow == 0) LogMsg("%s: mDNS_Unlock: ERROR! m->timenow aready zero", functionname);
- m->timenow = 0;
- }
-
- // MUST release the platform lock LAST!
- mDNSPlatformUnlock(m);
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - Specialized mDNS version of vsnprintf
-#endif
-
-static const struct mDNSprintf_format
- {
- unsigned leftJustify : 1;
- unsigned forceSign : 1;
- unsigned zeroPad : 1;
- unsigned havePrecision : 1;
- unsigned hSize : 1;
- unsigned lSize : 1;
- char altForm;
- char sign; // +, - or space
- unsigned int fieldWidth;
- unsigned int precision;
- } mDNSprintf_format_default = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
-
-mDNSexport mDNSu32 mDNS_vsnprintf(char *sbuffer, mDNSu32 buflen, const char *fmt, va_list arg)
- {
- mDNSu32 nwritten = 0;
- int c;
- if (buflen == 0) return(0);
- buflen--; // Pre-reserve one space in the buffer for the terminating null
- if (buflen == 0) goto exit;
-
- for (c = *fmt; c != 0; c = *++fmt)
- {
- if (c != '%')
- {
- *sbuffer++ = (char)c;
- if (++nwritten >= buflen) goto exit;
- }
- else
- {
- unsigned int i=0, j;
- // The mDNS Vsprintf Argument Conversion Buffer is used as a temporary holding area for
- // generating decimal numbers, hexdecimal numbers, IP addresses, domain name strings, etc.
- // The size needs to be enough for a 256-byte domain name plus some error text.
- #define mDNS_VACB_Size 300
- char mDNS_VACB[mDNS_VACB_Size];
- #define mDNS_VACB_Lim (&mDNS_VACB[mDNS_VACB_Size])
- #define mDNS_VACB_Remain(s) ((mDNSu32)(mDNS_VACB_Lim - s))
- char *s = mDNS_VACB_Lim, *digits;
- struct mDNSprintf_format F = mDNSprintf_format_default;
-
- while (1) // decode flags
- {
- c = *++fmt;
- if (c == '-') F.leftJustify = 1;
- else if (c == '+') F.forceSign = 1;
- else if (c == ' ') F.sign = ' ';
- else if (c == '#') F.altForm++;
- else if (c == '0') F.zeroPad = 1;
- else break;
- }
-
- if (c == '*') // decode field width
- {
- int f = va_arg(arg, int);
- if (f < 0) { f = -f; F.leftJustify = 1; }
- F.fieldWidth = (unsigned int)f;
- c = *++fmt;
- }
- else
- {
- for (; c >= '0' && c <= '9'; c = *++fmt)
- F.fieldWidth = (10 * F.fieldWidth) + (c - '0');
- }
-
- if (c == '.') // decode precision
- {
- if ((c = *++fmt) == '*')
- { F.precision = va_arg(arg, unsigned int); c = *++fmt; }
- else for (; c >= '0' && c <= '9'; c = *++fmt)
- F.precision = (10 * F.precision) + (c - '0');
- F.havePrecision = 1;
- }
-
- if (F.leftJustify) F.zeroPad = 0;
-
- conv:
- switch (c) // perform appropriate conversion
- {
- unsigned long n;
- case 'h' : F.hSize = 1; c = *++fmt; goto conv;
- case 'l' : // fall through
- case 'L' : F.lSize = 1; c = *++fmt; goto conv;
- case 'd' :
- case 'i' : if (F.lSize) n = (unsigned long)va_arg(arg, long);
- else n = (unsigned long)va_arg(arg, int);
- if (F.hSize) n = (short) n;
- if ((long) n < 0) { n = (unsigned long)-(long)n; F.sign = '-'; }
- else if (F.forceSign) F.sign = '+';
- goto decimal;
- case 'u' : if (F.lSize) n = va_arg(arg, unsigned long);
- else n = va_arg(arg, unsigned int);
- if (F.hSize) n = (unsigned short) n;
- F.sign = 0;
- goto decimal;
- decimal: if (!F.havePrecision)
- {
- if (F.zeroPad)
- {
- F.precision = F.fieldWidth;
- if (F.sign) --F.precision;
- }
- if (F.precision < 1) F.precision = 1;
- }
- if (F.precision > mDNS_VACB_Size - 1)
- F.precision = mDNS_VACB_Size - 1;
- for (i = 0; n; n /= 10, i++) *--s = (char)(n % 10 + '0');
- for (; i < F.precision; i++) *--s = '0';
- if (F.sign) { *--s = F.sign; i++; }
- break;
-
- case 'o' : if (F.lSize) n = va_arg(arg, unsigned long);
- else n = va_arg(arg, unsigned int);
- if (F.hSize) n = (unsigned short) n;
- if (!F.havePrecision)
- {
- if (F.zeroPad) F.precision = F.fieldWidth;
- if (F.precision < 1) F.precision = 1;
- }
- if (F.precision > mDNS_VACB_Size - 1)
- F.precision = mDNS_VACB_Size - 1;
- for (i = 0; n; n /= 8, i++) *--s = (char)(n % 8 + '0');
- if (F.altForm && i && *s != '0') { *--s = '0'; i++; }
- for (; i < F.precision; i++) *--s = '0';
- break;
-
- case 'a' : {
- unsigned char *a = va_arg(arg, unsigned char *);
- if (!a) { static char emsg[] = "<<NULL>>"; s = emsg; i = sizeof(emsg)-1; }
- else
- {
- s = mDNS_VACB; // Adjust s to point to the start of the buffer, not the end
- if (F.altForm)
- {
- mDNSAddr *ip = (mDNSAddr*)a;
- switch (ip->type)
- {
- case mDNSAddrType_IPv4: F.precision = 4; a = (unsigned char *)&ip->ip.v4; break;
- case mDNSAddrType_IPv6: F.precision = 16; a = (unsigned char *)&ip->ip.v6; break;
- default: F.precision = 0; break;
- }
- }
- if (F.altForm && !F.precision)
- i = mDNS_snprintf(mDNS_VACB, sizeof(mDNS_VACB), "<ZERO ADDRESS>");
- else switch (F.precision)
- {
- case 4: i = mDNS_snprintf(mDNS_VACB, sizeof(mDNS_VACB), "%d.%d.%d.%d",
- a[0], a[1], a[2], a[3]); break;
- case 6: i = mDNS_snprintf(mDNS_VACB, sizeof(mDNS_VACB), "%02X:%02X:%02X:%02X:%02X:%02X",
- a[0], a[1], a[2], a[3], a[4], a[5]); break;
- case 16: i = mDNS_snprintf(mDNS_VACB, sizeof(mDNS_VACB),
- "%02X%02X:%02X%02X:%02X%02X:%02X%02X:%02X%02X:%02X%02X:%02X%02X:%02X%02X",
- a[0x0], a[0x1], a[0x2], a[0x3], a[0x4], a[0x5], a[0x6], a[0x7],
- a[0x8], a[0x9], a[0xA], a[0xB], a[0xC], a[0xD], a[0xE], a[0xF]); break;
- default: i = mDNS_snprintf(mDNS_VACB, sizeof(mDNS_VACB), "%s", "<< ERROR: Must specify"
- " address size (i.e. %.4a=IPv4, %.6a=Ethernet, %.16a=IPv6) >>"); break;
- }
- }
- }
- break;
-
- case 'p' : F.havePrecision = F.lSize = 1;
- F.precision = sizeof(void*) * 2; // 8 characters on 32-bit; 16 characters on 64-bit
- case 'X' : digits = "0123456789ABCDEF";
- goto hexadecimal;
- case 'x' : digits = "0123456789abcdef";
- hexadecimal:if (F.lSize) n = va_arg(arg, unsigned long);
- else n = va_arg(arg, unsigned int);
- if (F.hSize) n = (unsigned short) n;
- if (!F.havePrecision)
- {
- if (F.zeroPad)
- {
- F.precision = F.fieldWidth;
- if (F.altForm) F.precision -= 2;
- }
- if (F.precision < 1) F.precision = 1;
- }
- if (F.precision > mDNS_VACB_Size - 1)
- F.precision = mDNS_VACB_Size - 1;
- for (i = 0; n; n /= 16, i++) *--s = digits[n % 16];
- for (; i < F.precision; i++) *--s = '0';
- if (F.altForm) { *--s = (char)c; *--s = '0'; i += 2; }
- break;
-
- case 'c' : *--s = (char)va_arg(arg, int); i = 1; break;
-
- case 's' : s = va_arg(arg, char *);
- if (!s) { static char emsg[] = "<<NULL>>"; s = emsg; i = sizeof(emsg)-1; }
- else switch (F.altForm)
- {
- case 0: i=0;
- if (!F.havePrecision) // C string
- while (s[i]) i++;
- else
- {
- while ((i < F.precision) && s[i]) i++;
- // Make sure we don't truncate in the middle of a UTF-8 character
- // If last character we got was any kind of UTF-8 multi-byte character,
- // then see if we have to back up.
- // This is not as easy as the similar checks below, because
- // here we can't assume it's safe to examine the *next* byte, so we
- // have to confine ourselves to working only backwards in the string.
- j = i; // Record where we got to
- // Now, back up until we find first non-continuation-char
- while (i>0 && (s[i-1] & 0xC0) == 0x80) i--;
- // Now s[i-1] is the first non-continuation-char
- // and (j-i) is the number of continuation-chars we found
- if (i>0 && (s[i-1] & 0xC0) == 0xC0) // If we found a start-char
- {
- i--; // Tentatively eliminate this start-char as well
- // Now (j-i) is the number of characters we're considering eliminating.
- // To be legal UTF-8, the start-char must contain (j-i) one-bits,
- // followed by a zero bit. If we shift it right by (7-(j-i)) bits
- // (with sign extension) then the result has to be 0xFE.
- // If this is right, then we reinstate the tentatively eliminated bytes.
- if (((j-i) < 7) && (((s[i] >> (7-(j-i))) & 0xFF) == 0xFE)) i = j;
- }
- }
- break;
- case 1: i = (unsigned char) *s++; break; // Pascal string
- case 2: { // DNS label-sequence name
- unsigned char *a = (unsigned char *)s;
- s = mDNS_VACB; // Adjust s to point to the start of the buffer, not the end
- if (*a == 0) *s++ = '.'; // Special case for root DNS name
- while (*a)
- {
- char buf[63*4+1];
- if (*a > 63)
- { s += mDNS_snprintf(s, mDNS_VACB_Remain(s), "<<INVALID LABEL LENGTH %u>>", *a); break; }
- if (s + *a >= &mDNS_VACB[254])
- { s += mDNS_snprintf(s, mDNS_VACB_Remain(s), "<<NAME TOO LONG>>"); break; }
- // Need to use ConvertDomainLabelToCString to do proper escaping here,
- // so it's clear what's a literal dot and what's a label separator
- ConvertDomainLabelToCString((domainlabel*)a, buf);
- s += mDNS_snprintf(s, mDNS_VACB_Remain(s), "%s.", buf);
- a += 1 + *a;
- }
- i = (mDNSu32)(s - mDNS_VACB);
- s = mDNS_VACB; // Reset s back to the start of the buffer
- break;
- }
- }
- // Make sure we don't truncate in the middle of a UTF-8 character (see similar comment below)
- if (F.havePrecision && i > F.precision)
- { i = F.precision; while (i>0 && (s[i] & 0xC0) == 0x80) i--; }
- break;
-
- case 'n' : s = va_arg(arg, char *);
- if (F.hSize) * (short *) s = (short)nwritten;
- else if (F.lSize) * (long *) s = (long)nwritten;
- else * (int *) s = (int)nwritten;
- continue;
-
- default: s = mDNS_VACB;
- i = mDNS_snprintf(mDNS_VACB, sizeof(mDNS_VACB), "<<UNKNOWN FORMAT CONVERSION CODE %%%c>>", c);
-
- case '%' : *sbuffer++ = (char)c;
- if (++nwritten >= buflen) goto exit;
- break;
- }
-
- if (i < F.fieldWidth && !F.leftJustify) // Pad on the left
- do {
- *sbuffer++ = ' ';
- if (++nwritten >= buflen) goto exit;
- } while (i < --F.fieldWidth);
-
- // Make sure we don't truncate in the middle of a UTF-8 character.
- // Note: s[i] is the first eliminated character; i.e. the next character *after* the last character of the
- // allowed output. If s[i] is a UTF-8 continuation character, then we've cut a unicode character in half,
- // so back up 'i' until s[i] is no longer a UTF-8 continuation character. (if the input was proprly
- // formed, s[i] will now be the UTF-8 start character of the multi-byte character we just eliminated).
- if (i > buflen - nwritten)
- { i = buflen - nwritten; while (i>0 && (s[i] & 0xC0) == 0x80) i--; }
- for (j=0; j<i; j++) *sbuffer++ = *s++; // Write the converted result
- nwritten += i;
- if (nwritten >= buflen) goto exit;
-
- for (; i < F.fieldWidth; i++) // Pad on the right
- {
- *sbuffer++ = ' ';
- if (++nwritten >= buflen) goto exit;
- }
- }
- }
- exit:
- *sbuffer++ = 0;
- return(nwritten);
- }
-
-mDNSexport mDNSu32 mDNS_snprintf(char *sbuffer, mDNSu32 buflen, const char *fmt, ...)
- {
- mDNSu32 length;
-
- va_list ptr;
- va_start(ptr,fmt);
- length = mDNS_vsnprintf(sbuffer, buflen, fmt, ptr);
- va_end(ptr);
-
- return(length);
- }
diff --git a/src/tools/mdnssd/DNSCommon.h b/src/tools/mdnssd/DNSCommon.h
deleted file mode 100644
index 5df4ce410d9..00000000000
--- a/src/tools/mdnssd/DNSCommon.h
+++ /dev/null
@@ -1,292 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef __DNSCOMMON_H_
-#define __DNSCOMMON_H_
-
-#include "mDNSEmbeddedAPI.h"
-
-#ifdef __cplusplus
- extern "C" {
-#endif
-
-//*************************************************************************************************************
-// Macros
-
-// Note: The C preprocessor stringify operator ('#') makes a string from its argument, without macro expansion
-// e.g. If "version" is #define'd to be "4", then STRINGIFY_AWE(version) will return the string "version", not "4"
-// To expand "version" to its value before making the string, use STRINGIFY(version) instead
-#define STRINGIFY_ARGUMENT_WITHOUT_EXPANSION(s) #s
-#define STRINGIFY(s) STRINGIFY_ARGUMENT_WITHOUT_EXPANSION(s)
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark - DNS Protocol Constants
-#endif
-
-typedef enum
- {
- kDNSFlag0_QR_Mask = 0x80, // Query or response?
- kDNSFlag0_QR_Query = 0x00,
- kDNSFlag0_QR_Response = 0x80,
-
- kDNSFlag0_OP_Mask = 0x78, // Operation type
- kDNSFlag0_OP_StdQuery = 0x00,
- kDNSFlag0_OP_Iquery = 0x08,
- kDNSFlag0_OP_Status = 0x10,
- kDNSFlag0_OP_Unused3 = 0x18,
- kDNSFlag0_OP_Notify = 0x20,
- kDNSFlag0_OP_Update = 0x28,
-
- kDNSFlag0_QROP_Mask = kDNSFlag0_QR_Mask | kDNSFlag0_OP_Mask,
-
- kDNSFlag0_AA = 0x04, // Authoritative Answer?
- kDNSFlag0_TC = 0x02, // Truncated?
- kDNSFlag0_RD = 0x01, // Recursion Desired?
- kDNSFlag1_RA = 0x80, // Recursion Available?
-
- kDNSFlag1_Zero = 0x40, // Reserved; must be zero
- kDNSFlag1_AD = 0x20, // Authentic Data [RFC 2535]
- kDNSFlag1_CD = 0x10, // Checking Disabled [RFC 2535]
-
- kDNSFlag1_RC_Mask = 0x0F, // Response code
- kDNSFlag1_RC_NoErr = 0x00,
- kDNSFlag1_RC_FormErr = 0x01,
- kDNSFlag1_RC_ServFail = 0x02,
- kDNSFlag1_RC_NXDomain = 0x03,
- kDNSFlag1_RC_NotImpl = 0x04,
- kDNSFlag1_RC_Refused = 0x05,
- kDNSFlag1_RC_YXDomain = 0x06,
- kDNSFlag1_RC_YXRRSet = 0x07,
- kDNSFlag1_RC_NXRRSet = 0x08,
- kDNSFlag1_RC_NotAuth = 0x09,
- kDNSFlag1_RC_NotZone = 0x0A
- } DNS_Flags;
-
-typedef enum
- {
- TSIG_ErrBadSig = 16,
- TSIG_ErrBadKey = 17,
- TSIG_ErrBadTime = 18
- } TSIG_ErrorCode;
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - General Utility Functions
-#endif
-
-extern NetworkInterfaceInfo *GetFirstActiveInterface(NetworkInterfaceInfo *intf);
-extern mDNSInterfaceID GetNextActiveInterfaceID(const NetworkInterfaceInfo *intf);
-
-extern mDNSu32 mDNSRandom(mDNSu32 max); // Returns pseudo-random result from zero to max inclusive
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - Domain Name Utility Functions
-#endif
-
-#define mDNSIsDigit(X) ((X) >= '0' && (X) <= '9')
-#define mDNSIsUpperCase(X) ((X) >= 'A' && (X) <= 'Z')
-#define mDNSIsLowerCase(X) ((X) >= 'a' && (X) <= 'z')
-#define mDNSIsLetter(X) (mDNSIsUpperCase(X) || mDNSIsLowerCase(X))
-
-#define mDNSValidHostChar(X, notfirst, notlast) (mDNSIsLetter(X) || mDNSIsDigit(X) || ((notfirst) && (notlast) && (X) == '-') )
-
-extern mDNSu16 CompressedDomainNameLength(const domainname *const name, const domainname *parent);
-extern int CountLabels(const domainname *d);
-extern const domainname *SkipLeadingLabels(const domainname *d, int skip);
-
-extern mDNSu32 TruncateUTF8ToLength(mDNSu8 *string, mDNSu32 length, mDNSu32 max);
-extern mDNSBool LabelContainsSuffix(const domainlabel *const name, const mDNSBool RichText);
-extern mDNSu32 RemoveLabelSuffix(domainlabel *name, mDNSBool RichText);
-extern void AppendLabelSuffix(domainlabel *const name, mDNSu32 val, const mDNSBool RichText);
-#define ValidateDomainName(N) (DomainNameLength(N) <= MAX_DOMAIN_NAME)
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - Resource Record Utility Functions
-#endif
-
-// IdenticalResourceRecord returns true if two resources records have
-// the same name, type, class, and identical rdata (InterfaceID and TTL may differ)
-
-// IdenticalSameNameRecord is the same, except it skips the expensive SameDomainName() check,
-// which is at its most expensive and least useful in cases where we know in advance that the names match
-
-// Note: The dominant use of IdenticalResourceRecord is from ProcessQuery(), handling known-answer lists. In this case
-// it's common to have a whole bunch or records with exactly the same name (e.g. "_http._tcp.local") but different RDATA.
-// The SameDomainName() check is expensive when the names match, and in this case *all* the names match, so we
-// used to waste a lot of CPU time verifying that the names match, only then to find that the RDATA is different.
-// We observed mDNSResponder spending 30% of its total CPU time on this single task alone.
-// By swapping the checks so that we check the RDATA first, we can quickly detect when it's different
-// (99% of the time) and then bail out before we waste time on the expensive SameDomainName() check.
-
-#define IdenticalResourceRecord(r1,r2) ( \
- (r1)->rrtype == (r2)->rrtype && \
- (r1)->rrclass == (r2)->rrclass && \
- (r1)->namehash == (r2)->namehash && \
- (r1)->rdlength == (r2)->rdlength && \
- (r1)->rdatahash == (r2)->rdatahash && \
- SameRDataBody((r1), &(r2)->rdata->u, SameDomainName) && \
- SameDomainName((r1)->name, (r2)->name))
-
-#define IdenticalSameNameRecord(r1,r2) ( \
- (r1)->rrtype == (r2)->rrtype && \
- (r1)->rrclass == (r2)->rrclass && \
- (r1)->rdlength == (r2)->rdlength && \
- (r1)->rdatahash == (r2)->rdatahash && \
- SameRDataBody((r1), &(r2)->rdata->u, SameDomainName))
-
-// A given RRType answers a QuestionType if RRType is CNAME, or types match, or QuestionType is ANY,
-// or the RRType is NSEC and positively asserts the nonexistence of the type being requested
-#define RRTypeAnswersQuestionType(R,Q) ((R)->rrtype == kDNSType_CNAME || (R)->rrtype == (Q) || (Q) == kDNSQType_ANY || RRAssertsNonexistence((R),(Q)))
-#define RRAssertsNonexistence(R,T) ((R)->rrtype == kDNSType_NSEC && (T) < kDNSQType_ANY && !((R)->rdata->u.nsec.bitmap[(T)>>3] & (128 >> ((T)&7))))
-
-extern mDNSu32 RDataHashValue(const ResourceRecord *const rr);
-extern mDNSBool SameRDataBody(const ResourceRecord *const r1, const RDataBody *const r2, DomainNameComparisonFn *samename);
-extern mDNSBool SameNameRecordAnswersQuestion(const ResourceRecord *const rr, const DNSQuestion *const q);
-extern mDNSBool ResourceRecordAnswersQuestion(const ResourceRecord *const rr, const DNSQuestion *const q);
-extern mDNSBool AnyTypeRecordAnswersQuestion (const ResourceRecord *const rr, const DNSQuestion *const q);
-extern mDNSBool ResourceRecordAnswersUnicastResponse(const ResourceRecord *const rr, const DNSQuestion *const q);
-extern mDNSBool LocalOnlyRecordAnswersQuestion(AuthRecord *const rr, const DNSQuestion *const q);
-extern mDNSu16 GetRDLength(const ResourceRecord *const rr, mDNSBool estimate);
-extern mDNSBool ValidateRData(const mDNSu16 rrtype, const mDNSu16 rdlength, const RData *const rd);
-
-#define GetRRDomainNameTarget(RR) ( \
- ((RR)->rrtype == kDNSType_NS || (RR)->rrtype == kDNSType_CNAME || (RR)->rrtype == kDNSType_PTR || (RR)->rrtype == kDNSType_DNAME) ? &(RR)->rdata->u.name : \
- ((RR)->rrtype == kDNSType_MX || (RR)->rrtype == kDNSType_AFSDB || (RR)->rrtype == kDNSType_RT || (RR)->rrtype == kDNSType_KX ) ? &(RR)->rdata->u.mx.exchange : \
- ((RR)->rrtype == kDNSType_SRV ) ? &(RR)->rdata->u.srv.target : mDNSNULL )
-
-#define LocalRecordReady(X) ((X)->resrec.RecordType != kDNSRecordTypeUnique)
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - DNS Message Creation Functions
-#endif
-
-extern void InitializeDNSMessage(DNSMessageHeader *h, mDNSOpaque16 id, mDNSOpaque16 flags);
-extern const mDNSu8 *FindCompressionPointer(const mDNSu8 *const base, const mDNSu8 *const end, const mDNSu8 *const domname);
-extern mDNSu8 *putDomainNameAsLabels(const DNSMessage *const msg, mDNSu8 *ptr, const mDNSu8 *const limit, const domainname *const name);
-extern mDNSu8 *putRData(const DNSMessage *const msg, mDNSu8 *ptr, const mDNSu8 *const limit, const ResourceRecord *const rr);
-
-// If we have a single large record to put in the packet, then we allow the packet to be up to 9K bytes,
-// but in the normal case we try to keep the packets below 1500 to avoid IP fragmentation on standard Ethernet
-
-#define AllowedRRSpace(msg) (((msg)->h.numAnswers || (msg)->h.numAuthorities || (msg)->h.numAdditionals) ? NormalMaxDNSMessageData : AbsoluteMaxDNSMessageData)
-
-extern mDNSu8 *PutResourceRecordTTLWithLimit(DNSMessage *const msg, mDNSu8 *ptr, mDNSu16 *count, ResourceRecord *rr, mDNSu32 ttl, const mDNSu8 *limit);
-
-#define PutResourceRecordTTL(msg, ptr, count, rr, ttl) \
- PutResourceRecordTTLWithLimit((msg), (ptr), (count), (rr), (ttl), (msg)->data + AllowedRRSpace(msg))
-
-#define PutResourceRecordTTLJumbo(msg, ptr, count, rr, ttl) \
- PutResourceRecordTTLWithLimit((msg), (ptr), (count), (rr), (ttl), (msg)->data + AbsoluteMaxDNSMessageData)
-
-#define PutResourceRecord(MSG, P, C, RR) PutResourceRecordTTL((MSG), (P), (C), (RR), (RR)->rroriginalttl)
-
-// The PutRR_OS variants assume a local variable 'm', put build the packet at m->omsg,
-// and assume a local variable 'OwnerRecordSpace' indicating how many bytes (if any) to reserve to add an OWNER option at the end
-#define PutRR_OS_TTL(ptr, count, rr, ttl) \
- PutResourceRecordTTLWithLimit(&m->omsg, (ptr), (count), (rr), (ttl), m->omsg.data + AllowedRRSpace(&m->omsg) - OwnerRecordSpace)
-
-#define PutRR_OS(P, C, RR) PutRR_OS_TTL((P), (C), (RR), (RR)->rroriginalttl)
-
-extern mDNSu8 *putQuestion(DNSMessage *const msg, mDNSu8 *ptr, const mDNSu8 *const limit, const domainname *const name, mDNSu16 rrtype, mDNSu16 rrclass);
-extern mDNSu8 *putZone(DNSMessage *const msg, mDNSu8 *ptr, mDNSu8 *limit, const domainname *zone, mDNSOpaque16 zoneClass);
-extern mDNSu8 *putPrereqNameNotInUse(const domainname *const name, DNSMessage *const msg, mDNSu8 *const ptr, mDNSu8 *const end);
-extern mDNSu8 *putDeletionRecord(DNSMessage *msg, mDNSu8 *ptr, ResourceRecord *rr);
-extern mDNSu8 *putDeletionRecordWithLimit(DNSMessage *msg, mDNSu8 *ptr, ResourceRecord *rr, mDNSu8 *limit);
-extern mDNSu8 *putDeleteRRSetWithLimit(DNSMessage *msg, mDNSu8 *ptr, const domainname *name, mDNSu16 rrtype, mDNSu8 *limit);
-extern mDNSu8 *putDeleteAllRRSets(DNSMessage *msg, mDNSu8 *ptr, const domainname *name);
-extern mDNSu8 *putUpdateLease(DNSMessage *msg, mDNSu8 *end, mDNSu32 lease);
-extern mDNSu8 *putUpdateLeaseWithLimit(DNSMessage *msg, mDNSu8 *ptr, mDNSu32 lease, mDNSu8 *limit);
-
-extern mDNSu8 *putHINFO(const mDNS *const m, DNSMessage *const msg, mDNSu8 *ptr, DomainAuthInfo *authInfo, mDNSu8 *limit);
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - DNS Message Parsing Functions
-#endif
-
-#define AuthHashSlot(X) (DomainNameHashValue(X) % AUTH_HASH_SLOTS)
-#define HashSlot(X) (DomainNameHashValue(X) % CACHE_HASH_SLOTS)
-extern mDNSu32 DomainNameHashValue(const domainname *const name);
-extern void SetNewRData(ResourceRecord *const rr, RData *NewRData, mDNSu16 rdlength);
-extern const mDNSu8 *skipDomainName(const DNSMessage *const msg, const mDNSu8 *ptr, const mDNSu8 *const end);
-extern const mDNSu8 *getDomainName(const DNSMessage *const msg, const mDNSu8 *ptr, const mDNSu8 *const end,
- domainname *const name);
-extern const mDNSu8 *skipResourceRecord(const DNSMessage *msg, const mDNSu8 *ptr, const mDNSu8 *end);
-extern const mDNSu8 *GetLargeResourceRecord(mDNS *const m, const DNSMessage * const msg, const mDNSu8 *ptr,
- const mDNSu8 * end, const mDNSInterfaceID InterfaceID, mDNSu8 RecordType, LargeCacheRecord *const largecr);
-extern const mDNSu8 *skipQuestion(const DNSMessage *msg, const mDNSu8 *ptr, const mDNSu8 *end);
-extern const mDNSu8 *getQuestion(const DNSMessage *msg, const mDNSu8 *ptr, const mDNSu8 *end, const mDNSInterfaceID InterfaceID,
- DNSQuestion *question);
-extern const mDNSu8 *LocateAnswers(const DNSMessage *const msg, const mDNSu8 *const end);
-extern const mDNSu8 *LocateAuthorities(const DNSMessage *const msg, const mDNSu8 *const end);
-extern const mDNSu8 *LocateAdditionals(const DNSMessage *const msg, const mDNSu8 *const end);
-extern const mDNSu8 *LocateOptRR(const DNSMessage *const msg, const mDNSu8 *const end, int minsize);
-extern const rdataOPT *GetLLQOptData(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *const end);
-extern mDNSu32 GetPktLease(mDNS *m, DNSMessage *msg, const mDNSu8 *end);
-extern void DumpPacket(mDNS *const m, mStatus status, mDNSBool sent, char *transport,
- const mDNSAddr *srcaddr, mDNSIPPort srcport,
- const mDNSAddr *dstaddr, mDNSIPPort dstport, const DNSMessage *const msg, const mDNSu8 *const end);
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - Packet Sending Functions
-#endif
-
-extern mStatus mDNSSendDNSMessage(mDNS *const m, DNSMessage *const msg, mDNSu8 *end,
- mDNSInterfaceID InterfaceID, UDPSocket *src, const mDNSAddr *dst, mDNSIPPort dstport, TCPSocket *sock, DomainAuthInfo *authInfo);
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - RR List Management & Task Management
-#endif
-
-extern void ShowTaskSchedulingError(mDNS *const m);
-extern void mDNS_Lock_(mDNS *const m, const char * const functionname);
-extern void mDNS_Unlock_(mDNS *const m, const char * const functionname);
-
-#if defined(_WIN32)
- #define __func__ __FUNCTION__
-#endif
-
-#define mDNS_Lock(X) mDNS_Lock_((X), __func__)
-
-#define mDNS_Unlock(X) mDNS_Unlock_((X), __func__)
-
-#define mDNS_DropLockBeforeCallback() do { m->mDNS_reentrancy++; \
- if (m->mDNS_busy != m->mDNS_reentrancy) LogMsg("%s: Locking Failure! mDNS_busy (%ld) != mDNS_reentrancy (%ld)", __func__, m->mDNS_busy, m->mDNS_reentrancy); \
- } while (0)
-
-#define mDNS_ReclaimLockAfterCallback() do { \
- if (m->mDNS_busy != m->mDNS_reentrancy) LogMsg("%s: Unlocking Failure! mDNS_busy (%ld) != mDNS_reentrancy (%ld)", __func__, m->mDNS_busy, m->mDNS_reentrancy); \
- m->mDNS_reentrancy--; } while (0)
-
-#ifdef __cplusplus
- }
-#endif
-
-#endif // __DNSCOMMON_H_
diff --git a/src/tools/mdnssd/DNSDigest.c b/src/tools/mdnssd/DNSDigest.c
deleted file mode 100644
index 98d23dbdd11..00000000000
--- a/src/tools/mdnssd/DNSDigest.c
+++ /dev/null
@@ -1,1584 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2002-2011 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#include "mDNSEmbeddedAPI.h"
-#include "DNSCommon.h"
-
-// Disable certain benign warnings with Microsoft compilers
-#if(defined(_MSC_VER))
- // Disable "conditional expression is constant" warning for debug macros.
- // Otherwise, this generates warnings for the perfectly natural construct "while(1)"
- // If someone knows a variant way of writing "while(1)" that doesn't generate warning messages, please let us know
- #pragma warning(disable:4127)
-#endif
-
-
- // ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark - Byte Swapping Functions
-#endif
-
-mDNSlocal mDNSu16 NToH16(mDNSu8 * bytes)
- {
- return (mDNSu16)((mDNSu16)bytes[0] << 8 | (mDNSu16)bytes[1]);
- }
-
-mDNSlocal mDNSu32 NToH32(mDNSu8 * bytes)
- {
- return (mDNSu32)((mDNSu32) bytes[0] << 24 | (mDNSu32) bytes[1] << 16 | (mDNSu32) bytes[2] << 8 | (mDNSu32)bytes[3]);
- }
-
- // ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark - MD5 Hash Functions
-#endif
-
-
-/* The source for the has is derived CommonCrypto files CommonDigest.h, md32_common.h, md5_locl.h, md5_locl.h, and openssl/md5.h.
- * The following changes have been made to the original sources:
- * replaced CC_LONG w/ mDNSu32
- * replaced CC_MD5* with MD5*
- * replaced CC_LONG w/ mDNSu32, removed conditional #defines from md5.h
- * removed extern decls for MD5_Init/Update/Final from CommonDigest.h
- * removed APPLE_COMMON_DIGEST specific #defines from md5_locl.h
- *
- * Note: machine archetecure specific conditionals from the original sources are turned off, but are left in the code
- * to aid in platform-specific optimizations and debugging.
- * Sources originally distributed under the following license headers:
- * CommonDigest.h - APSL
- *
- * md32_Common.h
- * ====================================================================
- * Copyright (c) 1999-2002 The OpenSSL Project. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. All advertising materials mentioning features or use of this
- * software must display the following acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
- *
- * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission. For written permission, please contact
- * licensing@OpenSSL.org.
- *
- * 5. Products derived from this software may not be called "OpenSSL"
- * nor may "OpenSSL" appear in their names without prior written
- * permission of the OpenSSL Project.
- *
- * 6. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
- *
- * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
- * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- *
- * md5_dgst.c, md5_locl.h
- * ====================================================================
- *
- * This product includes cryptographic software written by Eric Young
- * (eay@cryptsoft.com). This product includes software written by Tim
- * Hudson (tjh@cryptsoft.com).
- *
- * Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
- *
- */
-
-//from CommonDigest.h
-
-#define MD5_DIGEST_LENGTH 16 /* digest length in bytes */
-#define MD5_BLOCK_BYTES 64 /* block size in bytes */
-#define MD5_BLOCK_LONG (MD5_BLOCK_BYTES / sizeof(mDNSu32))
-
-typedef struct MD5state_st
-{
- mDNSu32 A,B,C,D;
- mDNSu32 Nl,Nh;
- mDNSu32 data[MD5_BLOCK_LONG];
- int num;
-} MD5_CTX;
-
-
-// from openssl/md5.h
-
-#define MD5_CBLOCK 64
-#define MD5_LBLOCK (MD5_CBLOCK/4)
-#define MD5_DIGEST_LENGTH 16
-
-int MD5_Init(MD5_CTX *c);
-int MD5_Update(MD5_CTX *c, const void *data, unsigned long len);
-int MD5_Final(unsigned char *md, MD5_CTX *c);
-void MD5_Transform(MD5_CTX *c, const unsigned char *b);
-
-// From md5_locl.h
-
-#ifndef MD5_LONG_LOG2
-#define MD5_LONG_LOG2 2 /* default to 32 bits */
-#endif
-
-#ifdef MD5_ASM
-# if defined(__i386) || defined(__i386__) || defined(_M_IX86) || defined(__INTEL__)
-# define md5_block_host_order md5_block_asm_host_order
-# elif defined(__sparc) && defined(OPENSSL_SYS_ULTRASPARC)
- void md5_block_asm_data_order_aligned (MD5_CTX *c, const mDNSu32 *p,int num);
-# define HASH_BLOCK_DATA_ORDER_ALIGNED md5_block_asm_data_order_aligned
-# endif
-#endif
-
-void md5_block_host_order (MD5_CTX *c, const void *p,int num);
-void md5_block_data_order (MD5_CTX *c, const void *p,int num);
-
-#if defined(__i386) || defined(__i386__) || defined(_M_IX86) || defined(__INTEL__)
-/*
- * *_block_host_order is expected to handle aligned data while
- * *_block_data_order - unaligned. As algorithm and host (x86)
- * are in this case of the same "endianness" these two are
- * otherwise indistinguishable. But normally you don't want to
- * call the same function because unaligned access in places
- * where alignment is expected is usually a "Bad Thing". Indeed,
- * on RISCs you get punished with BUS ERROR signal or *severe*
- * performance degradation. Intel CPUs are in turn perfectly
- * capable of loading unaligned data without such drastic side
- * effect. Yes, they say it's slower than aligned load, but no
- * exception is generated and therefore performance degradation
- * is *incomparable* with RISCs. What we should weight here is
- * costs of unaligned access against costs of aligning data.
- * According to my measurements allowing unaligned access results
- * in ~9% performance improvement on Pentium II operating at
- * 266MHz. I won't be surprised if the difference will be higher
- * on faster systems:-)
- *
- * <appro@fy.chalmers.se>
- */
-#define md5_block_data_order md5_block_host_order
-#endif
-
-#define DATA_ORDER_IS_LITTLE_ENDIAN
-
-#define HASH_LONG mDNSu32
-#define HASH_LONG_LOG2 MD5_LONG_LOG2
-#define HASH_CTX MD5_CTX
-#define HASH_CBLOCK MD5_CBLOCK
-#define HASH_LBLOCK MD5_LBLOCK
-
-#define HASH_UPDATE MD5_Update
-#define HASH_TRANSFORM MD5_Transform
-#define HASH_FINAL MD5_Final
-
-#define HASH_MAKE_STRING(c,s) do { \
- unsigned long ll; \
- ll=(c)->A; HOST_l2c(ll,(s)); \
- ll=(c)->B; HOST_l2c(ll,(s)); \
- ll=(c)->C; HOST_l2c(ll,(s)); \
- ll=(c)->D; HOST_l2c(ll,(s)); \
- } while (0)
-#define HASH_BLOCK_HOST_ORDER md5_block_host_order
-#if !defined(L_ENDIAN) || defined(md5_block_data_order)
-#define HASH_BLOCK_DATA_ORDER md5_block_data_order
-/*
- * Little-endians (Intel and Alpha) feel better without this.
- * It looks like memcpy does better job than generic
- * md5_block_data_order on copying-n-aligning input data.
- * But frankly speaking I didn't expect such result on Alpha.
- * On the other hand I've got this with egcs-1.0.2 and if
- * program is compiled with another (better?) compiler it
- * might turn out other way around.
- *
- * <appro@fy.chalmers.se>
- */
-#endif
-
-
-// from md32_common.h
-
-/*
- * This is a generic 32 bit "collector" for message digest algorithms.
- * Whenever needed it collects input character stream into chunks of
- * 32 bit values and invokes a block function that performs actual hash
- * calculations.
- *
- * Porting guide.
- *
- * Obligatory macros:
- *
- * DATA_ORDER_IS_BIG_ENDIAN or DATA_ORDER_IS_LITTLE_ENDIAN
- * this macro defines byte order of input stream.
- * HASH_CBLOCK
- * size of a unit chunk HASH_BLOCK operates on.
- * HASH_LONG
- * has to be at lest 32 bit wide, if it's wider, then
- * HASH_LONG_LOG2 *has to* be defined along
- * HASH_CTX
- * context structure that at least contains following
- * members:
- * typedef struct {
- * ...
- * HASH_LONG Nl,Nh;
- * HASH_LONG data[HASH_LBLOCK];
- * int num;
- * ...
- * } HASH_CTX;
- * HASH_UPDATE
- * name of "Update" function, implemented here.
- * HASH_TRANSFORM
- * name of "Transform" function, implemented here.
- * HASH_FINAL
- * name of "Final" function, implemented here.
- * HASH_BLOCK_HOST_ORDER
- * name of "block" function treating *aligned* input message
- * in host byte order, implemented externally.
- * HASH_BLOCK_DATA_ORDER
- * name of "block" function treating *unaligned* input message
- * in original (data) byte order, implemented externally (it
- * actually is optional if data and host are of the same
- * "endianess").
- * HASH_MAKE_STRING
- * macro convering context variables to an ASCII hash string.
- *
- * Optional macros:
- *
- * B_ENDIAN or L_ENDIAN
- * defines host byte-order.
- * HASH_LONG_LOG2
- * defaults to 2 if not states otherwise.
- * HASH_LBLOCK
- * assumed to be HASH_CBLOCK/4 if not stated otherwise.
- * HASH_BLOCK_DATA_ORDER_ALIGNED
- * alternative "block" function capable of treating
- * aligned input message in original (data) order,
- * implemented externally.
- *
- * MD5 example:
- *
- * #define DATA_ORDER_IS_LITTLE_ENDIAN
- *
- * #define HASH_LONG mDNSu32
- * #define HASH_LONG_LOG2 mDNSu32_LOG2
- * #define HASH_CTX MD5_CTX
- * #define HASH_CBLOCK MD5_CBLOCK
- * #define HASH_LBLOCK MD5_LBLOCK
- * #define HASH_UPDATE MD5_Update
- * #define HASH_TRANSFORM MD5_Transform
- * #define HASH_FINAL MD5_Final
- * #define HASH_BLOCK_HOST_ORDER md5_block_host_order
- * #define HASH_BLOCK_DATA_ORDER md5_block_data_order
- *
- * <appro@fy.chalmers.se>
- */
-
-#if !defined(DATA_ORDER_IS_BIG_ENDIAN) && !defined(DATA_ORDER_IS_LITTLE_ENDIAN)
-#error "DATA_ORDER must be defined!"
-#endif
-
-#ifndef HASH_CBLOCK
-#error "HASH_CBLOCK must be defined!"
-#endif
-#ifndef HASH_LONG
-#error "HASH_LONG must be defined!"
-#endif
-#ifndef HASH_CTX
-#error "HASH_CTX must be defined!"
-#endif
-
-#ifndef HASH_UPDATE
-#error "HASH_UPDATE must be defined!"
-#endif
-#ifndef HASH_TRANSFORM
-#error "HASH_TRANSFORM must be defined!"
-#endif
-#ifndef HASH_FINAL
-#error "HASH_FINAL must be defined!"
-#endif
-
-#ifndef HASH_BLOCK_HOST_ORDER
-#error "HASH_BLOCK_HOST_ORDER must be defined!"
-#endif
-
-#if 0
-/*
- * Moved below as it's required only if HASH_BLOCK_DATA_ORDER_ALIGNED
- * isn't defined.
- */
-#ifndef HASH_BLOCK_DATA_ORDER
-#error "HASH_BLOCK_DATA_ORDER must be defined!"
-#endif
-#endif
-
-#ifndef HASH_LBLOCK
-#define HASH_LBLOCK (HASH_CBLOCK/4)
-#endif
-
-#ifndef HASH_LONG_LOG2
-#define HASH_LONG_LOG2 2
-#endif
-
-/*
- * Engage compiler specific rotate intrinsic function if available.
- */
-#undef ROTATE
-#ifndef PEDANTIC
-# if 0 /* defined(_MSC_VER) */
-# define ROTATE(a,n) _lrotl(a,n)
-# elif defined(__MWERKS__)
-# if defined(__POWERPC__)
-# define ROTATE(a,n) (unsigned MD32_REG_T)__rlwinm((int)a,n,0,31)
-# elif defined(__MC68K__)
- /* Motorola specific tweak. <appro@fy.chalmers.se> */
-# define ROTATE(a,n) (n<24 ? __rol(a,n) : __ror(a,32-n))
-# else
-# define ROTATE(a,n) __rol(a,n)
-# endif
-# elif defined(__GNUC__) && __GNUC__>=2 && !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_NO_INLINE_ASM)
- /*
- * Some GNU C inline assembler templates. Note that these are
- * rotates by *constant* number of bits! But that's exactly
- * what we need here...
- *
- * <appro@fy.chalmers.se>
- */
- /*
- * LLVM is more strict about compatibility of types between input & output constraints,
- * but we want these to be rotations of 32 bits, not 64, so we explicitly drop the
- * most significant bytes by casting to an unsigned int.
- */
-# if defined(__i386) || defined(__i386__) || defined(__x86_64) || defined(__x86_64__)
-# define ROTATE(a,n) ({ register unsigned int ret; \
- asm ( \
- "roll %1,%0" \
- : "=r"(ret) \
- : "I"(n), "0"((unsigned int)a) \
- : "cc"); \
- ret; \
- })
-# elif defined(__powerpc) || defined(__ppc)
-# define ROTATE(a,n) ({ register unsigned int ret; \
- asm ( \
- "rlwinm %0,%1,%2,0,31" \
- : "=r"(ret) \
- : "r"(a), "I"(n)); \
- ret; \
- })
-# endif
-# endif
-
-/*
- * Engage compiler specific "fetch in reverse byte order"
- * intrinsic function if available.
- */
-# if defined(__GNUC__) && __GNUC__>=2 && !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_NO_INLINE_ASM)
- /* some GNU C inline assembler templates by <appro@fy.chalmers.se> */
-# if (defined(__i386) || defined(__i386__) || defined(__x86_64) || defined(__x86_64__)) && !defined(I386_ONLY)
-# define BE_FETCH32(a) ({ register unsigned int l=(a);\
- asm ( \
- "bswapl %0" \
- : "=r"(l) : "0"(l)); \
- l; \
- })
-# elif defined(__powerpc)
-# define LE_FETCH32(a) ({ register unsigned int l; \
- asm ( \
- "lwbrx %0,0,%1" \
- : "=r"(l) \
- : "r"(a)); \
- l; \
- })
-
-# elif defined(__sparc) && defined(OPENSSL_SYS_ULTRASPARC)
-# define LE_FETCH32(a) ({ register unsigned int l; \
- asm ( \
- "lda [%1]#ASI_PRIMARY_LITTLE,%0"\
- : "=r"(l) \
- : "r"(a)); \
- l; \
- })
-# endif
-# endif
-#endif /* PEDANTIC */
-
-#if HASH_LONG_LOG2==2 /* Engage only if sizeof(HASH_LONG)== 4 */
-/* A nice byte order reversal from Wei Dai <weidai@eskimo.com> */
-#ifdef ROTATE
-/* 5 instructions with rotate instruction, else 9 */
-#define REVERSE_FETCH32(a,l) ( \
- l=*(const HASH_LONG *)(a), \
- ((ROTATE(l,8)&0x00FF00FF)|(ROTATE((l&0x00FF00FF),24))) \
- )
-#else
-/* 6 instructions with rotate instruction, else 8 */
-#define REVERSE_FETCH32(a,l) ( \
- l=*(const HASH_LONG *)(a), \
- l=(((l>>8)&0x00FF00FF)|((l&0x00FF00FF)<<8)), \
- ROTATE(l,16) \
- )
-/*
- * Originally the middle line started with l=(((l&0xFF00FF00)>>8)|...
- * It's rewritten as above for two reasons:
- * - RISCs aren't good at long constants and have to explicitely
- * compose 'em with several (well, usually 2) instructions in a
- * register before performing the actual operation and (as you
- * already realized:-) having same constant should inspire the
- * compiler to permanently allocate the only register for it;
- * - most modern CPUs have two ALUs, but usually only one has
- * circuitry for shifts:-( this minor tweak inspires compiler
- * to schedule shift instructions in a better way...
- *
- * <appro@fy.chalmers.se>
- */
-#endif
-#endif
-
-#ifndef ROTATE
-#define ROTATE(a,n) (((a)<<(n))|(((a)&0xffffffff)>>(32-(n))))
-#endif
-
-/*
- * Make some obvious choices. E.g., HASH_BLOCK_DATA_ORDER_ALIGNED
- * and HASH_BLOCK_HOST_ORDER ought to be the same if input data
- * and host are of the same "endianess". It's possible to mask
- * this with blank #define HASH_BLOCK_DATA_ORDER though...
- *
- * <appro@fy.chalmers.se>
- */
-#if defined(B_ENDIAN)
-# if defined(DATA_ORDER_IS_BIG_ENDIAN)
-# if !defined(HASH_BLOCK_DATA_ORDER_ALIGNED) && HASH_LONG_LOG2==2
-# define HASH_BLOCK_DATA_ORDER_ALIGNED HASH_BLOCK_HOST_ORDER
-# endif
-# elif defined(DATA_ORDER_IS_LITTLE_ENDIAN)
-# ifndef HOST_FETCH32
-# ifdef LE_FETCH32
-# define HOST_FETCH32(p,l) LE_FETCH32(p)
-# elif defined(REVERSE_FETCH32)
-# define HOST_FETCH32(p,l) REVERSE_FETCH32(p,l)
-# endif
-# endif
-# endif
-#elif defined(L_ENDIAN)
-# if defined(DATA_ORDER_IS_LITTLE_ENDIAN)
-# if !defined(HASH_BLOCK_DATA_ORDER_ALIGNED) && HASH_LONG_LOG2==2
-# define HASH_BLOCK_DATA_ORDER_ALIGNED HASH_BLOCK_HOST_ORDER
-# endif
-# elif defined(DATA_ORDER_IS_BIG_ENDIAN)
-# ifndef HOST_FETCH32
-# ifdef BE_FETCH32
-# define HOST_FETCH32(p,l) BE_FETCH32(p)
-# elif defined(REVERSE_FETCH32)
-# define HOST_FETCH32(p,l) REVERSE_FETCH32(p,l)
-# endif
-# endif
-# endif
-#endif
-
-#if !defined(HASH_BLOCK_DATA_ORDER_ALIGNED)
-#ifndef HASH_BLOCK_DATA_ORDER
-#error "HASH_BLOCK_DATA_ORDER must be defined!"
-#endif
-#endif
-
-// None of the invocations of the following macros actually use the result,
-// so cast them to void to avoid any compiler warnings/errors about not using
-// the result (e.g. when using clang).
-// If the resultant values need to be used at some point, these must be changed.
-#define HOST_c2l(c,l) ((void)_HOST_c2l(c,l))
-#define HOST_l2c(l,c) ((void)_HOST_l2c(l,c))
-
-#if defined(DATA_ORDER_IS_BIG_ENDIAN)
-
-#define _HOST_c2l(c,l) (l =(((unsigned long)(*((c)++)))<<24), \
- l|=(((unsigned long)(*((c)++)))<<16), \
- l|=(((unsigned long)(*((c)++)))<< 8), \
- l|=(((unsigned long)(*((c)++))) ), \
- l)
-#define HOST_p_c2l(c,l,n) { \
- switch (n) { \
- case 0: l =((unsigned long)(*((c)++)))<<24; \
- case 1: l|=((unsigned long)(*((c)++)))<<16; \
- case 2: l|=((unsigned long)(*((c)++)))<< 8; \
- case 3: l|=((unsigned long)(*((c)++))); \
- } }
-#define HOST_p_c2l_p(c,l,sc,len) { \
- switch (sc) { \
- case 0: l =((unsigned long)(*((c)++)))<<24; \
- if (--len == 0) break; \
- case 1: l|=((unsigned long)(*((c)++)))<<16; \
- if (--len == 0) break; \
- case 2: l|=((unsigned long)(*((c)++)))<< 8; \
- } }
-/* NOTE the pointer is not incremented at the end of this */
-#define HOST_c2l_p(c,l,n) { \
- l=0; (c)+=n; \
- switch (n) { \
- case 3: l =((unsigned long)(*(--(c))))<< 8; \
- case 2: l|=((unsigned long)(*(--(c))))<<16; \
- case 1: l|=((unsigned long)(*(--(c))))<<24; \
- } }
-#define _HOST_l2c(l,c) (*((c)++)=(unsigned char)(((l)>>24)&0xff), \
- *((c)++)=(unsigned char)(((l)>>16)&0xff), \
- *((c)++)=(unsigned char)(((l)>> 8)&0xff), \
- *((c)++)=(unsigned char)(((l) )&0xff), \
- l)
-
-#elif defined(DATA_ORDER_IS_LITTLE_ENDIAN)
-
-#define _HOST_c2l(c,l) (l =(((unsigned long)(*((c)++))) ), \
- l|=(((unsigned long)(*((c)++)))<< 8), \
- l|=(((unsigned long)(*((c)++)))<<16), \
- l|=(((unsigned long)(*((c)++)))<<24), \
- l)
-#define HOST_p_c2l(c,l,n) { \
- switch (n) { \
- case 0: l =((unsigned long)(*((c)++))); \
- case 1: l|=((unsigned long)(*((c)++)))<< 8; \
- case 2: l|=((unsigned long)(*((c)++)))<<16; \
- case 3: l|=((unsigned long)(*((c)++)))<<24; \
- } }
-#define HOST_p_c2l_p(c,l,sc,len) { \
- switch (sc) { \
- case 0: l =((unsigned long)(*((c)++))); \
- if (--len == 0) break; \
- case 1: l|=((unsigned long)(*((c)++)))<< 8; \
- if (--len == 0) break; \
- case 2: l|=((unsigned long)(*((c)++)))<<16; \
- } }
-/* NOTE the pointer is not incremented at the end of this */
-#define HOST_c2l_p(c,l,n) { \
- l=0; (c)+=n; \
- switch (n) { \
- case 3: l =((unsigned long)(*(--(c))))<<16; \
- case 2: l|=((unsigned long)(*(--(c))))<< 8; \
- case 1: l|=((unsigned long)(*(--(c)))); \
- } }
-#define _HOST_l2c(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \
- *((c)++)=(unsigned char)(((l)>> 8)&0xff), \
- *((c)++)=(unsigned char)(((l)>>16)&0xff), \
- *((c)++)=(unsigned char)(((l)>>24)&0xff), \
- l)
-
-#endif
-
-/*
- * Time for some action:-)
- */
-
-int HASH_UPDATE (HASH_CTX *c, const void *data_, unsigned long len)
- {
- const unsigned char *data=(const unsigned char *)data_;
- register HASH_LONG * p;
- register unsigned long l;
- int sw,sc,ew,ec;
-
- if (len==0) return 1;
-
- l=(c->Nl+(len<<3))&0xffffffffL;
- /* 95-05-24 eay Fixed a bug with the overflow handling, thanks to
- * Wei Dai <weidai@eskimo.com> for pointing it out. */
- if (l < c->Nl) /* overflow */
- c->Nh++;
- c->Nh+=(len>>29);
- c->Nl=l;
-
- if (c->num != 0)
- {
- p=c->data;
- sw=c->num>>2;
- sc=c->num&0x03;
-
- if ((c->num+len) >= HASH_CBLOCK)
- {
- l=p[sw]; HOST_p_c2l(data,l,sc); p[sw++]=l;
- for (; sw<HASH_LBLOCK; sw++)
- {
- HOST_c2l(data,l); p[sw]=l;
- }
- HASH_BLOCK_HOST_ORDER (c,p,1);
- len-=(HASH_CBLOCK-c->num);
- c->num=0;
- /* drop through and do the rest */
- }
- else
- {
- c->num+=len;
- if ((sc+len) < 4) /* ugly, add char's to a word */
- {
- l=p[sw]; HOST_p_c2l_p(data,l,sc,len); p[sw]=l;
- }
- else
- {
- ew=(c->num>>2);
- ec=(c->num&0x03);
- if (sc)
- l=p[sw];
- HOST_p_c2l(data,l,sc);
- p[sw++]=l;
- for (; sw < ew; sw++)
- {
- HOST_c2l(data,l); p[sw]=l;
- }
- if (ec)
- {
- HOST_c2l_p(data,l,ec); p[sw]=l;
- }
- }
- return 1;
- }
- }
-
- sw=(int)(len/HASH_CBLOCK);
- if (sw > 0)
- {
-#if defined(HASH_BLOCK_DATA_ORDER_ALIGNED)
- /*
- * Note that HASH_BLOCK_DATA_ORDER_ALIGNED gets defined
- * only if sizeof(HASH_LONG)==4.
- */
- if ((((unsigned long)data)%4) == 0)
- {
- /* data is properly aligned so that we can cast it: */
- HASH_BLOCK_DATA_ORDER_ALIGNED (c,(HASH_LONG *)data,sw);
- sw*=HASH_CBLOCK;
- data+=sw;
- len-=sw;
- }
- else
-#if !defined(HASH_BLOCK_DATA_ORDER)
- while (sw--)
- {
- mDNSPlatformMemCopy(p=c->data,data,HASH_CBLOCK);
- HASH_BLOCK_DATA_ORDER_ALIGNED(c,p,1);
- data+=HASH_CBLOCK;
- len-=HASH_CBLOCK;
- }
-#endif
-#endif
-#if defined(HASH_BLOCK_DATA_ORDER)
- {
- HASH_BLOCK_DATA_ORDER(c,data,sw);
- sw*=HASH_CBLOCK;
- data+=sw;
- len-=sw;
- }
-#endif
- }
-
- if (len!=0)
- {
- p = c->data;
- c->num = (int)len;
- ew=(int)(len>>2); /* words to copy */
- ec=(int)(len&0x03);
- for (; ew; ew--,p++)
- {
- HOST_c2l(data,l); *p=l;
- }
- HOST_c2l_p(data,l,ec);
- *p=l;
- }
- return 1;
- }
-
-
-void HASH_TRANSFORM (HASH_CTX *c, const unsigned char *data)
- {
-#if defined(HASH_BLOCK_DATA_ORDER_ALIGNED)
- if ((((unsigned long)data)%4) == 0)
- /* data is properly aligned so that we can cast it: */
- HASH_BLOCK_DATA_ORDER_ALIGNED (c,(HASH_LONG *)data,1);
- else
-#if !defined(HASH_BLOCK_DATA_ORDER)
- {
- mDNSPlatformMemCopy(c->data,data,HASH_CBLOCK);
- HASH_BLOCK_DATA_ORDER_ALIGNED (c,c->data,1);
- }
-#endif
-#endif
-#if defined(HASH_BLOCK_DATA_ORDER)
- HASH_BLOCK_DATA_ORDER (c,data,1);
-#endif
- }
-
-
-int HASH_FINAL (unsigned char *md, HASH_CTX *c)
- {
- register HASH_LONG *p;
- register unsigned long l;
- register int i,j;
- static const unsigned char end[4]={0x80,0x00,0x00,0x00};
- const unsigned char *cp=end;
-
- /* c->num should definitly have room for at least one more byte. */
- p=c->data;
- i=c->num>>2;
- j=c->num&0x03;
-
-#if 0
- /* purify often complains about the following line as an
- * Uninitialized Memory Read. While this can be true, the
- * following p_c2l macro will reset l when that case is true.
- * This is because j&0x03 contains the number of 'valid' bytes
- * already in p[i]. If and only if j&0x03 == 0, the UMR will
- * occur but this is also the only time p_c2l will do
- * l= *(cp++) instead of l|= *(cp++)
- * Many thanks to Alex Tang <altitude@cic.net> for pickup this
- * 'potential bug' */
-#ifdef PURIFY
- if (j==0) p[i]=0; /* Yeah, but that's not the way to fix it:-) */
-#endif
- l=p[i];
-#else
- l = (j==0) ? 0 : p[i];
-#endif
- HOST_p_c2l(cp,l,j); p[i++]=l; /* i is the next 'undefined word' */
-
- if (i>(HASH_LBLOCK-2)) /* save room for Nl and Nh */
- {
- if (i<HASH_LBLOCK) p[i]=0;
- HASH_BLOCK_HOST_ORDER (c,p,1);
- i=0;
- }
- for (; i<(HASH_LBLOCK-2); i++)
- p[i]=0;
-
-#if defined(DATA_ORDER_IS_BIG_ENDIAN)
- p[HASH_LBLOCK-2]=c->Nh;
- p[HASH_LBLOCK-1]=c->Nl;
-#elif defined(DATA_ORDER_IS_LITTLE_ENDIAN)
- p[HASH_LBLOCK-2]=c->Nl;
- p[HASH_LBLOCK-1]=c->Nh;
-#endif
- HASH_BLOCK_HOST_ORDER (c,p,1);
-
-#ifndef HASH_MAKE_STRING
-#error "HASH_MAKE_STRING must be defined!"
-#else
- HASH_MAKE_STRING(c,md);
-#endif
-
- c->num=0;
- /* clear stuff, HASH_BLOCK may be leaving some stuff on the stack
- * but I'm not worried :-)
- OPENSSL_cleanse((void *)c,sizeof(HASH_CTX));
- */
- return 1;
- }
-
-#ifndef MD32_REG_T
-#define MD32_REG_T long
-/*
- * This comment was originaly written for MD5, which is why it
- * discusses A-D. But it basically applies to all 32-bit digests,
- * which is why it was moved to common header file.
- *
- * In case you wonder why A-D are declared as long and not
- * as mDNSu32. Doing so results in slight performance
- * boost on LP64 architectures. The catch is we don't
- * really care if 32 MSBs of a 64-bit register get polluted
- * with eventual overflows as we *save* only 32 LSBs in
- * *either* case. Now declaring 'em long excuses the compiler
- * from keeping 32 MSBs zeroed resulting in 13% performance
- * improvement under SPARC Solaris7/64 and 5% under AlphaLinux.
- * Well, to be honest it should say that this *prevents*
- * performance degradation.
- * <appro@fy.chalmers.se>
- * Apparently there're LP64 compilers that generate better
- * code if A-D are declared int. Most notably GCC-x86_64
- * generates better code.
- * <appro@fy.chalmers.se>
- */
-#endif
-
-
-// from md5_locl.h (continued)
-
-/*
-#define F(x,y,z) (((x) & (y)) | ((~(x)) & (z)))
-#define G(x,y,z) (((x) & (z)) | ((y) & (~(z))))
-*/
-
-/* As pointed out by Wei Dai <weidai@eskimo.com>, the above can be
- * simplified to the code below. Wei attributes these optimizations
- * to Peter Gutmann's SHS code, and he attributes it to Rich Schroeppel.
- */
-#define F(b,c,d) ((((c) ^ (d)) & (b)) ^ (d))
-#define G(b,c,d) ((((b) ^ (c)) & (d)) ^ (c))
-#define H(b,c,d) ((b) ^ (c) ^ (d))
-#define I(b,c,d) (((~(d)) | (b)) ^ (c))
-
-#define R0(a,b,c,d,k,s,t) { \
- a+=((k)+(t)+F((b),(c),(d))); \
- a=ROTATE(a,s); \
- a+=b; };\
-
-#define R1(a,b,c,d,k,s,t) { \
- a+=((k)+(t)+G((b),(c),(d))); \
- a=ROTATE(a,s); \
- a+=b; };
-
-#define R2(a,b,c,d,k,s,t) { \
- a+=((k)+(t)+H((b),(c),(d))); \
- a=ROTATE(a,s); \
- a+=b; };
-
-#define R3(a,b,c,d,k,s,t) { \
- a+=((k)+(t)+I((b),(c),(d))); \
- a=ROTATE(a,s); \
- a+=b; };
-
-// from md5_dgst.c
-
-
-/* Implemented from RFC1321 The MD5 Message-Digest Algorithm
- */
-
-#define INIT_DATA_A (unsigned long)0x67452301L
-#define INIT_DATA_B (unsigned long)0xefcdab89L
-#define INIT_DATA_C (unsigned long)0x98badcfeL
-#define INIT_DATA_D (unsigned long)0x10325476L
-
-int MD5_Init(MD5_CTX *c)
- {
- c->A=INIT_DATA_A;
- c->B=INIT_DATA_B;
- c->C=INIT_DATA_C;
- c->D=INIT_DATA_D;
- c->Nl=0;
- c->Nh=0;
- c->num=0;
- return 1;
- }
-
-#ifndef md5_block_host_order
-void md5_block_host_order (MD5_CTX *c, const void *data, int num)
- {
- const mDNSu32 *X=(const mDNSu32 *)data;
- register unsigned MD32_REG_T A,B,C,D;
-
- A=c->A;
- B=c->B;
- C=c->C;
- D=c->D;
-
- for (;num--;X+=HASH_LBLOCK)
- {
- /* Round 0 */
- R0(A,B,C,D,X[ 0], 7,0xd76aa478L);
- R0(D,A,B,C,X[ 1],12,0xe8c7b756L);
- R0(C,D,A,B,X[ 2],17,0x242070dbL);
- R0(B,C,D,A,X[ 3],22,0xc1bdceeeL);
- R0(A,B,C,D,X[ 4], 7,0xf57c0fafL);
- R0(D,A,B,C,X[ 5],12,0x4787c62aL);
- R0(C,D,A,B,X[ 6],17,0xa8304613L);
- R0(B,C,D,A,X[ 7],22,0xfd469501L);
- R0(A,B,C,D,X[ 8], 7,0x698098d8L);
- R0(D,A,B,C,X[ 9],12,0x8b44f7afL);
- R0(C,D,A,B,X[10],17,0xffff5bb1L);
- R0(B,C,D,A,X[11],22,0x895cd7beL);
- R0(A,B,C,D,X[12], 7,0x6b901122L);
- R0(D,A,B,C,X[13],12,0xfd987193L);
- R0(C,D,A,B,X[14],17,0xa679438eL);
- R0(B,C,D,A,X[15],22,0x49b40821L);
- /* Round 1 */
- R1(A,B,C,D,X[ 1], 5,0xf61e2562L);
- R1(D,A,B,C,X[ 6], 9,0xc040b340L);
- R1(C,D,A,B,X[11],14,0x265e5a51L);
- R1(B,C,D,A,X[ 0],20,0xe9b6c7aaL);
- R1(A,B,C,D,X[ 5], 5,0xd62f105dL);
- R1(D,A,B,C,X[10], 9,0x02441453L);
- R1(C,D,A,B,X[15],14,0xd8a1e681L);
- R1(B,C,D,A,X[ 4],20,0xe7d3fbc8L);
- R1(A,B,C,D,X[ 9], 5,0x21e1cde6L);
- R1(D,A,B,C,X[14], 9,0xc33707d6L);
- R1(C,D,A,B,X[ 3],14,0xf4d50d87L);
- R1(B,C,D,A,X[ 8],20,0x455a14edL);
- R1(A,B,C,D,X[13], 5,0xa9e3e905L);
- R1(D,A,B,C,X[ 2], 9,0xfcefa3f8L);
- R1(C,D,A,B,X[ 7],14,0x676f02d9L);
- R1(B,C,D,A,X[12],20,0x8d2a4c8aL);
- /* Round 2 */
- R2(A,B,C,D,X[ 5], 4,0xfffa3942L);
- R2(D,A,B,C,X[ 8],11,0x8771f681L);
- R2(C,D,A,B,X[11],16,0x6d9d6122L);
- R2(B,C,D,A,X[14],23,0xfde5380cL);
- R2(A,B,C,D,X[ 1], 4,0xa4beea44L);
- R2(D,A,B,C,X[ 4],11,0x4bdecfa9L);
- R2(C,D,A,B,X[ 7],16,0xf6bb4b60L);
- R2(B,C,D,A,X[10],23,0xbebfbc70L);
- R2(A,B,C,D,X[13], 4,0x289b7ec6L);
- R2(D,A,B,C,X[ 0],11,0xeaa127faL);
- R2(C,D,A,B,X[ 3],16,0xd4ef3085L);
- R2(B,C,D,A,X[ 6],23,0x04881d05L);
- R2(A,B,C,D,X[ 9], 4,0xd9d4d039L);
- R2(D,A,B,C,X[12],11,0xe6db99e5L);
- R2(C,D,A,B,X[15],16,0x1fa27cf8L);
- R2(B,C,D,A,X[ 2],23,0xc4ac5665L);
- /* Round 3 */
- R3(A,B,C,D,X[ 0], 6,0xf4292244L);
- R3(D,A,B,C,X[ 7],10,0x432aff97L);
- R3(C,D,A,B,X[14],15,0xab9423a7L);
- R3(B,C,D,A,X[ 5],21,0xfc93a039L);
- R3(A,B,C,D,X[12], 6,0x655b59c3L);
- R3(D,A,B,C,X[ 3],10,0x8f0ccc92L);
- R3(C,D,A,B,X[10],15,0xffeff47dL);
- R3(B,C,D,A,X[ 1],21,0x85845dd1L);
- R3(A,B,C,D,X[ 8], 6,0x6fa87e4fL);
- R3(D,A,B,C,X[15],10,0xfe2ce6e0L);
- R3(C,D,A,B,X[ 6],15,0xa3014314L);
- R3(B,C,D,A,X[13],21,0x4e0811a1L);
- R3(A,B,C,D,X[ 4], 6,0xf7537e82L);
- R3(D,A,B,C,X[11],10,0xbd3af235L);
- R3(C,D,A,B,X[ 2],15,0x2ad7d2bbL);
- R3(B,C,D,A,X[ 9],21,0xeb86d391L);
-
- A = c->A += A;
- B = c->B += B;
- C = c->C += C;
- D = c->D += D;
- }
- }
-#endif
-
-#ifndef md5_block_data_order
-#ifdef X
-#undef X
-#endif
-void md5_block_data_order (MD5_CTX *c, const void *data_, int num)
- {
- const unsigned char *data=data_;
- register unsigned MD32_REG_T A,B,C,D,l;
-#ifndef MD32_XARRAY
- /* See comment in crypto/sha/sha_locl.h for details. */
- unsigned MD32_REG_T XX0, XX1, XX2, XX3, XX4, XX5, XX6, XX7,
- XX8, XX9,XX10,XX11,XX12,XX13,XX14,XX15;
-# define X(i) XX##i
-#else
- mDNSu32 XX[MD5_LBLOCK];
-# define X(i) XX[i]
-#endif
-
- A=c->A;
- B=c->B;
- C=c->C;
- D=c->D;
-
- for (;num--;)
- {
- HOST_c2l(data,l); X( 0)=l; HOST_c2l(data,l); X( 1)=l;
- /* Round 0 */
- R0(A,B,C,D,X( 0), 7,0xd76aa478L); HOST_c2l(data,l); X( 2)=l;
- R0(D,A,B,C,X( 1),12,0xe8c7b756L); HOST_c2l(data,l); X( 3)=l;
- R0(C,D,A,B,X( 2),17,0x242070dbL); HOST_c2l(data,l); X( 4)=l;
- R0(B,C,D,A,X( 3),22,0xc1bdceeeL); HOST_c2l(data,l); X( 5)=l;
- R0(A,B,C,D,X( 4), 7,0xf57c0fafL); HOST_c2l(data,l); X( 6)=l;
- R0(D,A,B,C,X( 5),12,0x4787c62aL); HOST_c2l(data,l); X( 7)=l;
- R0(C,D,A,B,X( 6),17,0xa8304613L); HOST_c2l(data,l); X( 8)=l;
- R0(B,C,D,A,X( 7),22,0xfd469501L); HOST_c2l(data,l); X( 9)=l;
- R0(A,B,C,D,X( 8), 7,0x698098d8L); HOST_c2l(data,l); X(10)=l;
- R0(D,A,B,C,X( 9),12,0x8b44f7afL); HOST_c2l(data,l); X(11)=l;
- R0(C,D,A,B,X(10),17,0xffff5bb1L); HOST_c2l(data,l); X(12)=l;
- R0(B,C,D,A,X(11),22,0x895cd7beL); HOST_c2l(data,l); X(13)=l;
- R0(A,B,C,D,X(12), 7,0x6b901122L); HOST_c2l(data,l); X(14)=l;
- R0(D,A,B,C,X(13),12,0xfd987193L); HOST_c2l(data,l); X(15)=l;
- R0(C,D,A,B,X(14),17,0xa679438eL);
- R0(B,C,D,A,X(15),22,0x49b40821L);
- /* Round 1 */
- R1(A,B,C,D,X( 1), 5,0xf61e2562L);
- R1(D,A,B,C,X( 6), 9,0xc040b340L);
- R1(C,D,A,B,X(11),14,0x265e5a51L);
- R1(B,C,D,A,X( 0),20,0xe9b6c7aaL);
- R1(A,B,C,D,X( 5), 5,0xd62f105dL);
- R1(D,A,B,C,X(10), 9,0x02441453L);
- R1(C,D,A,B,X(15),14,0xd8a1e681L);
- R1(B,C,D,A,X( 4),20,0xe7d3fbc8L);
- R1(A,B,C,D,X( 9), 5,0x21e1cde6L);
- R1(D,A,B,C,X(14), 9,0xc33707d6L);
- R1(C,D,A,B,X( 3),14,0xf4d50d87L);
- R1(B,C,D,A,X( 8),20,0x455a14edL);
- R1(A,B,C,D,X(13), 5,0xa9e3e905L);
- R1(D,A,B,C,X( 2), 9,0xfcefa3f8L);
- R1(C,D,A,B,X( 7),14,0x676f02d9L);
- R1(B,C,D,A,X(12),20,0x8d2a4c8aL);
- /* Round 2 */
- R2(A,B,C,D,X( 5), 4,0xfffa3942L);
- R2(D,A,B,C,X( 8),11,0x8771f681L);
- R2(C,D,A,B,X(11),16,0x6d9d6122L);
- R2(B,C,D,A,X(14),23,0xfde5380cL);
- R2(A,B,C,D,X( 1), 4,0xa4beea44L);
- R2(D,A,B,C,X( 4),11,0x4bdecfa9L);
- R2(C,D,A,B,X( 7),16,0xf6bb4b60L);
- R2(B,C,D,A,X(10),23,0xbebfbc70L);
- R2(A,B,C,D,X(13), 4,0x289b7ec6L);
- R2(D,A,B,C,X( 0),11,0xeaa127faL);
- R2(C,D,A,B,X( 3),16,0xd4ef3085L);
- R2(B,C,D,A,X( 6),23,0x04881d05L);
- R2(A,B,C,D,X( 9), 4,0xd9d4d039L);
- R2(D,A,B,C,X(12),11,0xe6db99e5L);
- R2(C,D,A,B,X(15),16,0x1fa27cf8L);
- R2(B,C,D,A,X( 2),23,0xc4ac5665L);
- /* Round 3 */
- R3(A,B,C,D,X( 0), 6,0xf4292244L);
- R3(D,A,B,C,X( 7),10,0x432aff97L);
- R3(C,D,A,B,X(14),15,0xab9423a7L);
- R3(B,C,D,A,X( 5),21,0xfc93a039L);
- R3(A,B,C,D,X(12), 6,0x655b59c3L);
- R3(D,A,B,C,X( 3),10,0x8f0ccc92L);
- R3(C,D,A,B,X(10),15,0xffeff47dL);
- R3(B,C,D,A,X( 1),21,0x85845dd1L);
- R3(A,B,C,D,X( 8), 6,0x6fa87e4fL);
- R3(D,A,B,C,X(15),10,0xfe2ce6e0L);
- R3(C,D,A,B,X( 6),15,0xa3014314L);
- R3(B,C,D,A,X(13),21,0x4e0811a1L);
- R3(A,B,C,D,X( 4), 6,0xf7537e82L);
- R3(D,A,B,C,X(11),10,0xbd3af235L);
- R3(C,D,A,B,X( 2),15,0x2ad7d2bbL);
- R3(B,C,D,A,X( 9),21,0xeb86d391L);
-
- A = c->A += A;
- B = c->B += B;
- C = c->C += C;
- D = c->D += D;
- }
- }
-#endif
-
-
- // ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark - base64 -> binary conversion
-#endif
-
-static const char Base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-static const char Pad64 = '=';
-
-
-#define mDNSisspace(x) (x == '\t' || x == '\n' || x == '\v' || x == '\f' || x == '\r' || x == ' ')
-
-mDNSlocal const char *mDNSstrchr(const char *s, int c)
- {
- while (1)
- {
- if (c == *s) return s;
- if (!*s) return mDNSNULL;
- s++;
- }
- }
-
-// skips all whitespace anywhere.
-// converts characters, four at a time, starting at (or after)
-// src from base - 64 numbers into three 8 bit bytes in the target area.
-// it returns the number of data bytes stored at the target, or -1 on error.
-// adapted from BIND sources
-
-mDNSlocal mDNSs32 DNSDigest_Base64ToBin(const char *src, mDNSu8 *target, mDNSu32 targsize)
- {
- int tarindex, state, ch;
- const char *pos;
-
- state = 0;
- tarindex = 0;
-
- while ((ch = *src++) != '\0') {
- if (mDNSisspace(ch)) /* Skip whitespace anywhere. */
- continue;
-
- if (ch == Pad64)
- break;
-
- pos = mDNSstrchr(Base64, ch);
- if (pos == 0) /* A non-base64 character. */
- return (-1);
-
- switch (state) {
- case 0:
- if (target) {
- if ((mDNSu32)tarindex >= targsize)
- return (-1);
- target[tarindex] = (mDNSu8)((pos - Base64) << 2);
- }
- state = 1;
- break;
- case 1:
- if (target) {
- if ((mDNSu32)tarindex + 1 >= targsize)
- return (-1);
- target[tarindex] |= (pos - Base64) >> 4;
- target[tarindex+1] = (mDNSu8)(((pos - Base64) & 0x0f) << 4);
- }
- tarindex++;
- state = 2;
- break;
- case 2:
- if (target) {
- if ((mDNSu32)tarindex + 1 >= targsize)
- return (-1);
- target[tarindex] |= (pos - Base64) >> 2;
- target[tarindex+1] = (mDNSu8)(((pos - Base64) & 0x03) << 6);
- }
- tarindex++;
- state = 3;
- break;
- case 3:
- if (target) {
- if ((mDNSu32)tarindex >= targsize)
- return (-1);
- target[tarindex] |= (pos - Base64);
- }
- tarindex++;
- state = 0;
- break;
- default:
- return -1;
- }
- }
-
- /*
- * We are done decoding Base-64 chars. Let's see if we ended
- * on a byte boundary, and/or with erroneous trailing characters.
- */
-
- if (ch == Pad64) { /* We got a pad char. */
- ch = *src++; /* Skip it, get next. */
- switch (state) {
- case 0: /* Invalid = in first position */
- case 1: /* Invalid = in second position */
- return (-1);
-
- case 2: /* Valid, means one byte of info */
- /* Skip any number of spaces. */
- for ((void)mDNSNULL; ch != '\0'; ch = *src++)
- if (!mDNSisspace(ch))
- break;
- /* Make sure there is another trailing = sign. */
- if (ch != Pad64)
- return (-1);
- ch = *src++; /* Skip the = */
- /* Fall through to "single trailing =" case. */
- /* FALLTHROUGH */
-
- case 3: /* Valid, means two bytes of info */
- /*
- * We know this char is an =. Is there anything but
- * whitespace after it?
- */
- for ((void)mDNSNULL; ch != '\0'; ch = *src++)
- if (!mDNSisspace(ch))
- return (-1);
-
- /*
- * Now make sure for cases 2 and 3 that the "extra"
- * bits that slopped past the last full byte were
- * zeros. If we don't check them, they become a
- * subliminal channel.
- */
- if (target && target[tarindex] != 0)
- return (-1);
- }
- } else {
- /*
- * We ended by seeing the end of the string. Make sure we
- * have no partial bytes lying around.
- */
- if (state != 0)
- return (-1);
- }
-
- return (tarindex);
- }
-
-
- // ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark - API exported to mDNS Core
-#endif
-
-// Constants
-#define HMAC_IPAD 0x36
-#define HMAC_OPAD 0x5c
-#define MD5_LEN 16
-
-#define HMAC_MD5_AlgName (*(const domainname*) "\010" "hmac-md5" "\007" "sig-alg" "\003" "reg" "\003" "int")
-
-// Adapted from Appendix, RFC 2104
-mDNSlocal void DNSDigest_ConstructHMACKey(DomainAuthInfo *info, const mDNSu8 *key, mDNSu32 len)
- {
- MD5_CTX k;
- mDNSu8 buf[MD5_LEN];
- int i;
-
- // If key is longer than HMAC_LEN reset it to MD5(key)
- if (len > HMAC_LEN)
- {
- MD5_Init(&k);
- MD5_Update(&k, key, len);
- MD5_Final(buf, &k);
- key = buf;
- len = MD5_LEN;
- }
-
- // store key in pads
- mDNSPlatformMemZero(info->keydata_ipad, HMAC_LEN);
- mDNSPlatformMemZero(info->keydata_opad, HMAC_LEN);
- mDNSPlatformMemCopy(info->keydata_ipad, key, len);
- mDNSPlatformMemCopy(info->keydata_opad, key, len);
-
- // XOR key with ipad and opad values
- for (i = 0; i < HMAC_LEN; i++)
- {
- info->keydata_ipad[i] ^= HMAC_IPAD;
- info->keydata_opad[i] ^= HMAC_OPAD;
- }
-
- }
-
-mDNSexport mDNSs32 DNSDigest_ConstructHMACKeyfromBase64(DomainAuthInfo *info, const char *b64key)
- {
- mDNSu8 keybuf[1024];
- mDNSs32 keylen = DNSDigest_Base64ToBin(b64key, keybuf, sizeof(keybuf));
- if (keylen < 0) return(keylen);
- DNSDigest_ConstructHMACKey(info, keybuf, (mDNSu32)keylen);
- return(keylen);
- }
-
-mDNSexport void DNSDigest_SignMessage(DNSMessage *msg, mDNSu8 **end, DomainAuthInfo *info, mDNSu16 tcode)
- {
- AuthRecord tsig;
- mDNSu8 *rdata, *const countPtr = (mDNSu8 *)&msg->h.numAdditionals; // Get existing numAdditionals value
- mDNSu32 utc32;
- mDNSu8 utc48[6];
- mDNSu8 digest[MD5_LEN];
- mDNSu8 *ptr = *end;
- mDNSu32 len;
- mDNSOpaque16 buf;
- MD5_CTX c;
- mDNSu16 numAdditionals = (mDNSu16)((mDNSu16)countPtr[0] << 8 | countPtr[1]);
-
- // Init MD5 context, digest inner key pad and message
- MD5_Init(&c);
- MD5_Update(&c, info->keydata_ipad, HMAC_LEN);
- MD5_Update(&c, (mDNSu8 *)msg, (unsigned long)(*end - (mDNSu8 *)msg));
-
- // Construct TSIG RR, digesting variables as apporpriate
- mDNS_SetupResourceRecord(&tsig, mDNSNULL, 0, kDNSType_TSIG, 0, kDNSRecordTypeKnownUnique, AuthRecordAny, mDNSNULL, mDNSNULL);
-
- // key name
- AssignDomainName(&tsig.namestorage, &info->keyname);
- MD5_Update(&c, info->keyname.c, DomainNameLength(&info->keyname));
-
- // class
- tsig.resrec.rrclass = kDNSQClass_ANY;
- buf = mDNSOpaque16fromIntVal(kDNSQClass_ANY);
- MD5_Update(&c, buf.b, sizeof(mDNSOpaque16));
-
- // ttl
- tsig.resrec.rroriginalttl = 0;
- MD5_Update(&c, (mDNSu8 *)&tsig.resrec.rroriginalttl, sizeof(tsig.resrec.rroriginalttl));
-
- // alg name
- AssignDomainName(&tsig.resrec.rdata->u.name, &HMAC_MD5_AlgName);
- len = DomainNameLength(&HMAC_MD5_AlgName);
- rdata = tsig.resrec.rdata->u.data + len;
- MD5_Update(&c, HMAC_MD5_AlgName.c, len);
-
- // time
- // get UTC (universal time), convert to 48-bit unsigned in network byte order
- utc32 = (mDNSu32)mDNSPlatformUTC();
- if (utc32 == (unsigned)-1) { LogMsg("ERROR: DNSDigest_SignMessage - mDNSPlatformUTC returned bad time -1"); *end = mDNSNULL; }
- utc48[0] = 0;
- utc48[1] = 0;
- utc48[2] = (mDNSu8)((utc32 >> 24) & 0xff);
- utc48[3] = (mDNSu8)((utc32 >> 16) & 0xff);
- utc48[4] = (mDNSu8)((utc32 >> 8) & 0xff);
- utc48[5] = (mDNSu8)( utc32 & 0xff);
-
- mDNSPlatformMemCopy(rdata, utc48, 6);
- rdata += 6;
- MD5_Update(&c, utc48, 6);
-
- // 300 sec is fudge recommended in RFC 2485
- rdata[0] = (mDNSu8)((300 >> 8) & 0xff);
- rdata[1] = (mDNSu8)( 300 & 0xff);
- MD5_Update(&c, rdata, sizeof(mDNSOpaque16));
- rdata += sizeof(mDNSOpaque16);
-
- // digest error (tcode) and other data len (zero) - we'll add them to the rdata later
- buf.b[0] = (mDNSu8)((tcode >> 8) & 0xff);
- buf.b[1] = (mDNSu8)( tcode & 0xff);
- MD5_Update(&c, buf.b, sizeof(mDNSOpaque16)); // error
- buf.NotAnInteger = 0;
- MD5_Update(&c, buf.b, sizeof(mDNSOpaque16)); // other data len
-
- // finish the message & tsig var hash
- MD5_Final(digest, &c);
-
- // perform outer MD5 (outer key pad, inner digest)
- MD5_Init(&c);
- MD5_Update(&c, info->keydata_opad, HMAC_LEN);
- MD5_Update(&c, digest, MD5_LEN);
- MD5_Final(digest, &c);
-
- // set remaining rdata fields
- rdata[0] = (mDNSu8)((MD5_LEN >> 8) & 0xff);
- rdata[1] = (mDNSu8)( MD5_LEN & 0xff);
- rdata += sizeof(mDNSOpaque16);
- mDNSPlatformMemCopy(rdata, digest, MD5_LEN); // MAC
- rdata += MD5_LEN;
- rdata[0] = msg->h.id.b[0]; // original ID
- rdata[1] = msg->h.id.b[1];
- rdata[2] = (mDNSu8)((tcode >> 8) & 0xff);
- rdata[3] = (mDNSu8)( tcode & 0xff);
- rdata[4] = 0; // other data len
- rdata[5] = 0;
- rdata += 6;
-
- tsig.resrec.rdlength = (mDNSu16)(rdata - tsig.resrec.rdata->u.data);
- *end = PutResourceRecordTTLJumbo(msg, ptr, &numAdditionals, &tsig.resrec, 0);
- if (!*end) { LogMsg("ERROR: DNSDigest_SignMessage - could not put TSIG"); *end = mDNSNULL; return; }
-
- // Write back updated numAdditionals value
- countPtr[0] = (mDNSu8)(numAdditionals >> 8);
- countPtr[1] = (mDNSu8)(numAdditionals & 0xFF);
- }
-
-mDNSexport mDNSBool DNSDigest_VerifyMessage(DNSMessage *msg, mDNSu8 *end, LargeCacheRecord * lcr, DomainAuthInfo *info, mDNSu16 * rcode, mDNSu16 * tcode)
- {
- mDNSu8 * ptr = (mDNSu8*) &lcr->r.resrec.rdata->u.data;
- mDNSs32 now;
- mDNSs32 then;
- mDNSu8 thisDigest[MD5_LEN];
- mDNSu8 thatDigest[MD5_LEN];
- mDNSu32 macsize;
- mDNSOpaque16 buf;
- mDNSu8 utc48[6];
- mDNSs32 delta;
- mDNSu16 fudge;
- domainname * algo;
- MD5_CTX c;
- mDNSBool ok = mDNSfalse;
-
- // We only support HMAC-MD5 for now
-
- algo = (domainname*) ptr;
-
- if (!SameDomainName(algo, &HMAC_MD5_AlgName))
- {
- LogMsg("ERROR: DNSDigest_VerifyMessage - TSIG algorithm not supported: %##s", algo->c);
- *rcode = kDNSFlag1_RC_NotAuth;
- *tcode = TSIG_ErrBadKey;
- ok = mDNSfalse;
- goto exit;
- }
-
- ptr += DomainNameLength(algo);
-
- // Check the times
-
- now = mDNSPlatformUTC();
- if (now == -1)
- {
- LogMsg("ERROR: DNSDigest_VerifyMessage - mDNSPlatformUTC returned bad time -1");
- *rcode = kDNSFlag1_RC_NotAuth;
- *tcode = TSIG_ErrBadTime;
- ok = mDNSfalse;
- goto exit;
- }
-
- // Get the 48 bit time field, skipping over the first word
-
- utc48[0] = *ptr++;
- utc48[1] = *ptr++;
- utc48[2] = *ptr++;
- utc48[3] = *ptr++;
- utc48[4] = *ptr++;
- utc48[5] = *ptr++;
-
- then = (mDNSs32)NToH32(utc48 + sizeof(mDNSu16));
-
- fudge = NToH16(ptr);
-
- ptr += sizeof(mDNSu16);
-
- delta = (now > then) ? now - then : then - now;
-
- if (delta > fudge)
- {
- LogMsg("ERROR: DNSDigest_VerifyMessage - time skew > %d", fudge);
- *rcode = kDNSFlag1_RC_NotAuth;
- *tcode = TSIG_ErrBadTime;
- ok = mDNSfalse;
- goto exit;
- }
-
- // MAC size
-
- macsize = (mDNSu32) NToH16(ptr);
-
- ptr += sizeof(mDNSu16);
-
- // MAC
-
- mDNSPlatformMemCopy(thatDigest, ptr, MD5_LEN);
-
- // Init MD5 context, digest inner key pad and message
-
- MD5_Init(&c);
- MD5_Update(&c, info->keydata_ipad, HMAC_LEN);
- MD5_Update(&c, (mDNSu8*) msg, (unsigned long)(end - (mDNSu8*) msg));
-
- // Key name
-
- MD5_Update(&c, lcr->r.resrec.name->c, DomainNameLength(lcr->r.resrec.name));
-
- // Class name
-
- buf = mDNSOpaque16fromIntVal(lcr->r.resrec.rrclass);
- MD5_Update(&c, buf.b, sizeof(mDNSOpaque16));
-
- // TTL
-
- MD5_Update(&c, (mDNSu8*) &lcr->r.resrec.rroriginalttl, sizeof(lcr->r.resrec.rroriginalttl));
-
- // Algorithm
-
- MD5_Update(&c, algo->c, DomainNameLength(algo));
-
- // Time
-
- MD5_Update(&c, utc48, 6);
-
- // Fudge
-
- buf = mDNSOpaque16fromIntVal(fudge);
- MD5_Update(&c, buf.b, sizeof(mDNSOpaque16));
-
- // Digest error and other data len (both zero) - we'll add them to the rdata later
-
- buf.NotAnInteger = 0;
- MD5_Update(&c, buf.b, sizeof(mDNSOpaque16)); // error
- MD5_Update(&c, buf.b, sizeof(mDNSOpaque16)); // other data len
-
- // Finish the message & tsig var hash
-
- MD5_Final(thisDigest, &c);
-
- // perform outer MD5 (outer key pad, inner digest)
-
- MD5_Init(&c);
- MD5_Update(&c, info->keydata_opad, HMAC_LEN);
- MD5_Update(&c, thisDigest, MD5_LEN);
- MD5_Final(thisDigest, &c);
-
- if (!mDNSPlatformMemSame(thisDigest, thatDigest, MD5_LEN))
- {
- LogMsg("ERROR: DNSDigest_VerifyMessage - bad signature");
- *rcode = kDNSFlag1_RC_NotAuth;
- *tcode = TSIG_ErrBadSig;
- ok = mDNSfalse;
- goto exit;
- }
-
- // set remaining rdata fields
- ok = mDNStrue;
-
-exit:
-
- return ok;
- }
-
-
-#ifdef __cplusplus
-}
-#endif
diff --git a/src/tools/mdnssd/DebugServices.h b/src/tools/mdnssd/DebugServices.h
deleted file mode 100644
index d4e5c7203df..00000000000
--- a/src/tools/mdnssd/DebugServices.h
+++ /dev/null
@@ -1,1607 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 1997-2004 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @header DebugServices
-
- Debugging Library
-*/
-
-#ifndef __DEBUG_SERVICES__
-#define __DEBUG_SERVICES__
-
-#include <stdarg.h>
-
-#include "CommonServices.h"
-
-#if( TARGET_OS_VXWORKS )
- #include "logLib.h"
-#endif
-
-#if 0
-#pragma mark == Settings ==
-#endif
-
-//===========================================================================================================================
-// Settings
-//===========================================================================================================================
-
-// General
-
-#if( !defined( DEBUG ) )
- #define DEBUG 0
-#endif
-
-#if( defined( NDEBUG ) && DEBUG )
- #error NDEBUG defined and DEBUG is also enabled...they need to be in-sync
-#endif
-
-// AssertMacros.h/Debugging.h overrides.
-
-#if( !defined( DEBUG_OVERRIDE_APPLE_MACROS ) )
- #define DEBUG_OVERRIDE_APPLE_MACROS 1
-#endif
-
-// Routine name. Uses ISO __func__ where possible. Otherwise, uses the best thing that is available (if anything).
-
-#if( defined( __MWERKS__ ) || ( __GNUC__ > 2 ) || ( ( __GNUC__ == 2 ) && ( __GNUC_MINOR__ >= 9 ) ) )
- #define __ROUTINE__ __func__
-#elif( defined( __GNUC__ ) )
- #define __ROUTINE__ __PRETTY_FUNCTION__
-#elif( defined( _MSC_VER ) && !defined( _WIN32_WCE ) )
- #define __ROUTINE__ __FUNCTION__
-#else
- #define __ROUTINE__ ""
-#endif
-
-// Variable argument macro support. Use ANSI C99 __VA_ARGS__ where possible. Otherwise, use the next best thing.
-
-#if( defined( __GNUC__ ) )
- #if( ( __GNUC__ > 3 ) || ( ( __GNUC__ == 3 ) && ( __GNUC_MINOR__ >= 3) ) )
- #define DEBUG_C99_VA_ARGS 1
- #define DEBUG_GNU_VA_ARGS 0
- #else
- #define DEBUG_C99_VA_ARGS 0
- #define DEBUG_GNU_VA_ARGS 1
- #endif
-#elif( defined( __MWERKS__ ) )
- #define DEBUG_C99_VA_ARGS 1
- #define DEBUG_GNU_VA_ARGS 0
-#else
- #define DEBUG_C99_VA_ARGS 0
- #define DEBUG_GNU_VA_ARGS 0
-#endif
-
-#if 0
-#pragma mark == Output ==
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined DEBUG_FPRINTF_ENABLED
-
- @abstract Enables ANSI C fprintf output.
-*/
-
-#if( !defined( DEBUG_FPRINTF_ENABLED ) )
- #if( !TARGET_API_MAC_OSX_KERNEL && !TARGET_OS_WINDOWS_CE )
- #define DEBUG_FPRINTF_ENABLED 1
- #else
- #define DEBUG_FPRINTF_ENABLED 0
- #endif
-#else
- #if( TARGET_API_MAC_OSX_KERNEL || TARGET_OS_WINDOWS_CE )
- #error fprintf enabled, but not supported on Mac OS X kernel or Windows CE
- #endif
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined DEBUG_MAC_OS_X_IOLOG_ENABLED
-
- @abstract Enables IOLog (Mac OS X Kernel) output.
-*/
-
-#if( !defined( DEBUG_MAC_OS_X_IOLOG_ENABLED ) )
- #define DEBUG_MAC_OS_X_IOLOG_ENABLED TARGET_API_MAC_OSX_KERNEL
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined DEBUG_KPRINTF_ENABLED
-
- @abstract Enables kprintf (Mac OS X Kernel) output.
-*/
-
-#if( !defined( DEBUG_KPRINTF_ENABLED ) )
- #define DEBUG_KPRINTF_ENABLED TARGET_API_MAC_OSX_KERNEL
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined DEBUG_IDEBUG_ENABLED
-
- @abstract Enables iDebug (Mac OS X user and Kernel) output.
-
- @discussion
-
- For Mac OS X kernel development, iDebug is enabled by default because we can dynamically check for the presence
- of iDebug via some exported IOKit symbols. Mac OS X app usage doesn't allow dynamic detection because it relies
- on statically linking to the iDebugServices.cp file so for Mac OS X app usage, you have to manually enable iDebug.
-*/
-
-#if( !defined( DEBUG_IDEBUG_ENABLED ) )
- #define DEBUG_IDEBUG_ENABLED TARGET_API_MAC_OSX_KERNEL
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined DEBUG_CORE_SERVICE_ASSERTS_ENABLED
-
- @abstract Controls whether Core Services assert handling is enabled. Enabling requires CoreServices framework.
-*/
-
-#if( !defined( DEBUG_CORE_SERVICE_ASSERTS_ENABLED ) )
- #if( defined( __DEBUGGING__ ) )
- #define DEBUG_CORE_SERVICE_ASSERTS_ENABLED 1
- #else
- #define DEBUG_CORE_SERVICE_ASSERTS_ENABLED 0
- #endif
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @typedef DebugOutputType
-
- @abstract Type of debug output (i.e. where the output goes).
-*/
-
-typedef uint32_t DebugOutputType;
-
-#define kDebugOutputTypeNone 0x6E6F6E65U // 'none' - no params
-#define kDebugOutputTypeCustom 0x63757374U // 'cust' - 1st param = function ptr, 2nd param = context
-#define kDebugOutputTypeFPrintF 0x66707269U // 'fpri' - 1st param = DebugOutputTypeFlags [, 2nd param = filename]
-#define kDebugOutputTypeiDebug 0x69646267U // 'idbg' - no params
-#define kDebugOutputTypeKPrintF 0x6B707266U // 'kprf' - no params
-#define kDebugOutputTypeMacOSXIOLog 0x696C6F67U // 'ilog' - no params
-#define kDebugOutputTypeMacOSXLog 0x786C6F67U // 'xlog' - no params
-#define kDebugOutputTypeWindowsDebugger 0x77696E64U // 'wind' - no params
-#define kDebugOutputTypeWindowsEventLog 0x7765766CU // 'wevl' - 1st param = C-string name, 2nd param = HMODULE or NULL.
-
-// Console meta output kind - Any kind of Console output (in horizontal order of preference):
-//
-// Mac OS X = ANSI printf (viewable in Console.app)
-// Mac OS X Kernel = IOLog (/var/log/system.log) or kprintf (serial).
-// Windows = ANSI printf (Console window) or OutputDebugString (debugger).
-// Other = ANSI printf (viewer varies).
-
-#define kDebugOutputTypeMetaConsole 0x434F4E53U // 'CONS' - no params
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @typedef DebugOutputTypeFlags
-
- @abstract Flags controlling how the output type is configured.
-
- @constant kDebugOutputTypeFlagsTypeMask Bit mask for the output type (e.g. stdout, stderr, file, etc.).
- @constant kDebugOutputTypeFlagsStdOut fprintf should go to stdout.
- @constant kDebugOutputTypeFlagsStdErr fprintf should go to stderr.
- @constant kDebugOutputTypeFlagsFile fprintf should go to a specific file (filename passed as va_arg).
-*/
-
-typedef unsigned int DebugOutputTypeFlags;
-
-#define kDebugOutputTypeFlagsTypeMask 0xF
-#define kDebugOutputTypeFlagsStdOut 1
-#define kDebugOutputTypeFlagsStdErr 2
-#define kDebugOutputTypeFlagsFile 10
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @typedef DebugOutputFunctionPtr
-
- @abstract Function ptr for a custom callback to print debug output.
-*/
-
-typedef void ( *DebugOutputFunctionPtr )( char *inData, size_t inSize, void *inContext );
-
-//===========================================================================================================================
-// Constants
-//===========================================================================================================================
-
-#if 0
-#pragma mark == Flags ==
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @typedef DebugFlags
-
- @abstract Flags controlling how output is printed.
-*/
-
-typedef uint32_t DebugFlags;
-
-#define kDebugFlagsNone 0
-#define kDebugFlagsNoAddress ( 1 << 0 )
-#define kDebugFlagsNoOffset ( 1 << 1 )
-#define kDebugFlags32BitOffset ( 1 << 2 )
-#define kDebugFlagsNoASCII ( 1 << 3 )
-#define kDebugFlagsNoNewLine ( 1 << 4 )
-#define kDebugFlags8BitSeparator ( 1 << 5 )
-#define kDebugFlags16BitSeparator ( 1 << 6 )
-#define kDebugFlagsNo32BitSeparator ( 1 << 7 )
-#define kDebugFlagsNo16ByteHexPad ( 1 << 8 )
-#define kDebugFlagsNoByteCount ( 1 << 9 )
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @enum DebugTaskLevelFlags
-
- @abstract Flags indicating the task level.
-*/
-
-enum
-{
- kDebugInterruptLevelShift = 0,
- kDebugInterruptLevelMask = 0x00000007,
- kDebugInVBLTaskMask = 0x00000010,
- kDebugInDeferredTaskMask = 0x00000020,
- kDebugInSecondaryInterruptHandlerMask = 0x00000040,
- kDebugPageFaultFatalMask = 0x00000100, // There should be a "kPageFaultFatalMask" in Debugging.h.
- kDebugMPTaskLevelMask = 0x00000200, // There should be a "kMPTaskLevelMask" in Debugging.h.
- kDebugInterruptDepthShift = 16,
- kDebugInterruptDepthMask = 0x00FF0000
-};
-
-#define DebugExtractTaskLevelInterruptLevel( LEVEL ) \
- ( ( ( LEVEL ) & kDebugInterruptLevelMask ) >> kDebugInterruptLevelShift )
-
-#define DebugExtractTaskLevelInterruptDepth( LEVEL ) \
- ( ( ( LEVEL ) & kDebugInterruptDepthMask ) >> kDebugInterruptDepthShift )
-
-#if 0
-#pragma mark == Levels ==
-#endif
-
-//===========================================================================================================================
-// Constants & Types - Levels
-//===========================================================================================================================
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @typedef DebugLevel
-
- @abstract Level used to control debug logging.
-*/
-
-typedef int32_t DebugLevel;
-
-// Levels
-
-#define kDebugLevelMask 0x0000FFFF
-#define kDebugLevelChatty 100
-#define kDebugLevelVerbose 500
-#define kDebugLevelTrace 800
-#define kDebugLevelInfo 1000
-#define kDebugLevelNotice 3000
-#define kDebugLevelWarning 5000
-#define kDebugLevelAssert 6000
-#define kDebugLevelRequire 7000
-#define kDebugLevelError 8000
-#define kDebugLevelCritical 9000
-#define kDebugLevelAlert 10000
-#define kDebugLevelEmergency 11000
-#define kDebugLevelTragic 12000
-#define kDebugLevelMax 0x0000FFFF
-
-// Level Flags
-
-#define kDebugLevelFlagMask 0xFFFF0000
-#define kDebugLevelFlagStackTrace 0x00010000
-#define kDebugLevelFlagDebugBreak 0x00020000
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @typedef LogLevel
-
- @abstract Level used to control which events are logged.
-*/
-
-typedef int32_t LogLevel;
-
-#define kLogLevelUninitialized -1L
-#define kLogLevelAll 0L
-#define kLogLevelChatty 100L
-#define kLogLevelVerbose 500L
-#define kLogLevelTrace 800L
-#define kLogLevelInfo 1000L
-#define kLogLevelNotice 3000L
-#define kLogLevelWarning 4000L
-#define kLogLevelAssert 6000L
-#define kLogLevelRequire 7000L
-#define kLogLevelError 8000L
-#define kLogLevelCritical 9000L
-#define kLogLevelAlert 10000L
-#define kLogLevelEmergency 11000L
-#define kLogLevelTragic 12000L
-#define kLogLevelOff 0x0000FFFEL
-
-#if 0
-#pragma mark == Properties ==
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @typedef DebugPropertyTag
-
- @abstract Tag for properties.
-*/
-
-typedef uint32_t DebugPropertyTag;
-
-#define kDebugPropertyTagPrintLevelMin 0x6D696E70U // 'minp' Get: 1st param = DebugLevel *
- // Set: 1st param = DebugLevel
-
-#define kDebugPropertyTagPrintLevel kDebugPropertyTagPrintLevelMin
-
-#define kDebugPropertyTagPrintLevelMax 0x706D786CU // 'maxp' Get: 1st param = DebugLevel *
- // Set: 1st param = DebugLevel
-
-#define kDebugPropertyTagBreakLevel 0x62726B6CU // 'brkl' Get: 1st param = DebugLevel *
- // Set: 1st param = DebugLevel
-#if 0
-#pragma mark == General macros ==
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined DEBUG_UNUSED
-
- @abstract Macro to mark a paramter as unused to avoid unused parameter warnings.
-
- @discussion
-
- There is no universally supported pragma/attribute for indicating a variable is unused. DEBUG_UNUSED lets us
- indicate a variable is unused in a manner that is supported by most compilers.
-*/
-
-#define DEBUG_UNUSED( X ) (void)( X )
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined DEBUG_USE_ONLY
-
- @abstract Macro to mark a variable as used only when debugging is enabled.
-
- @discussion
-
- Variables are sometimes needed only for debugging. When debugging is turned off, these debug-only variables generate
- compiler warnings about unused variables. To eliminate these warnings, use these macros to indicate variables that
- are only used for debugging.
-*/
-
-#if( DEBUG )
- #define DEBUG_USE_ONLY( X )
-#else
- #define DEBUG_USE_ONLY( X ) (void)( X )
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined DEBUG_LOCAL
-
- @abstract Macros to make variables and functions static when debugging is off, but extern when debugging is on.
-
- @discussion
-
- Rather than using "static" directly, using this macros allows you to access these variables external while
- debugging without being penalized for production builds.
-*/
-
-#if( DEBUG )
- #define DEBUG_LOCAL
-#else
- #define DEBUG_LOCAL static
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined DEBUG_STATIC
-
- @abstract Macros to make variables and functions static when debugging is off, but extern when debugging is on.
-
- @discussion
-
- Rather than using "static" directly, using this macros allows you to access these variables external while
- debugging without being penalized for production builds.
-*/
-
-#if( DEBUG )
- #define DEBUG_STATIC
-#else
- #define DEBUG_STATIC static
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined DEBUG_EXPORT
-
- @abstract Macros to export variables.
-
- @discussion
-
- "__private_extern__" is a hack for IOKit to allow symbols to be exported from compilation units, but
- // not exported outside a driver (IOKit uses a lame global namespace for symbols). This still does not
- // solve the problem of multiple drivers in the same dependency chain since they share symbols.
-*/
-
-#if( TARGET_API_MAC_OSX_KERNEL )
- #define DEBUG_EXPORT __private_extern__
-#else
- #define DEBUG_EXPORT extern
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined debug_add
-
- @abstract Macro to add (or subtract if negative) a value when debugging is on. Does nothing if debugging is off.
-*/
-
-#if( DEBUG )
- #define debug_add( A, B ) ( A ) += ( B )
-#else
- #define debug_add( A, B )
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined debug_perform
-
- @abstract Macro to perform something in debug-only builds.
-*/
-
-#if( DEBUG )
- #define debug_perform( X ) do { X; } while( 0 )
-#else
- #define debug_perform( X )
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @function translate_errno
-
- @abstract Returns 0 if the test success. If the test fails, returns errno if non-zero and othewise the alternate error.
-*/
-
-#define translate_errno( TEST, ERRNO, ALTERNATE_ERROR ) ( ( TEST ) ? 0 : ( ERRNO ) ? ( ERRNO ) : ( ALTERNATE_ERROR ) )
-
-#if 0
-#pragma mark == Compile Time macros ==
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined check_compile_time
-
- @abstract Performs a compile-time check of something such as the size of an int.
-
- @discussion
-
- This declares an array with a size that is determined by a compile-time expression. If the expression evaluates
- to 0, the array has a size of -1, which is illegal and generates a compile-time error.
-
- For example:
-
- check_compile_time( sizeof( int ) == 4 );
-
- Note: This only works with compile-time expressions.
- Note: This only works in places where extern declarations are allowed (e.g. global scope).
-
- References:
-
- <http://www.jaggersoft.com/pubs/CVu11_3.html>
- <http://www.jaggersoft.com/pubs/CVu11_5.html>
-
- Note: The following macros differ from the macros on the www.jaggersoft.com web site because those versions do not
- work with GCC due to GCC allow a zero-length array. Using a -1 condition turned out to be more portable.
-*/
-
-#define check_compile_time( X ) extern int debug_compile_time_name[ ( X ) ? 1 : -1 ]
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined check_compile_time_code
-
- @abstract Perform a compile-time check, suitable for placement in code, of something such as the size of an int.
-
- @discussion
-
- This creates a switch statement with an existing case for 0 and an additional case using the result of a
- compile-time expression. A switch statement cannot have two case labels with the same constant so if the
- compile-time expression evaluates to 0, it is illegal and generates a compile-time error. If the compile-time
- expression does not evaluate to 0, the resulting value is used as the case label and it compiles without error.
-
- For example:
-
- check_compile_time_code( sizeof( int ) == 4 );
-
- Note: This only works with compile-time expressions.
- Note: This does not work in a global scope so it must be inside a function.
-
- References:
-
- <http://www.jaggersoft.com/pubs/CVu11_3.html>
- <http://www.jaggersoft.com/pubs/CVu11_5.html>
-*/
-
-#define check_compile_time_code( X ) switch( 0 ) { case 0: case X:; }
-
-#if 0
-#pragma mark == check macros ==
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined check
-
- @abstract Check that an expression is true (non-zero).
-
- @discussion
-
- If expression evalulates to false, this prints debugging information (actual expression string, file, line number,
- function name, etc.) using the default debugging output method.
-
- Code inside check() statements is not compiled into production builds.
-*/
-
-#if( DEBUG_OVERRIDE_APPLE_MACROS )
- #undef check
-#endif
-#if( !defined( check ) )
- #if( DEBUG )
- #define check( X ) \
- do \
- { \
- if( !( X ) ) \
- { \
- debug_print_assert( 0, #X, NULL, __FILE__, __LINE__, __ROUTINE__ ); \
- } \
- } while( 0 )
- #else
- #define check( X )
- #endif
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined check_string
-
- @abstract Check that an expression is true (non-zero) with an explanation.
-
- @discussion
-
- If expression evalulates to false, this prints debugging information (actual expression string, file, line number,
- function name, etc.) and a custom explanation string using the default debugging output method.
-
- Code inside check_string() statements is not compiled into production builds.
-*/
-
-#if( DEBUG_OVERRIDE_APPLE_MACROS )
- #undef check_string
-#endif
-#if( !defined( check_string ) )
- #if( DEBUG )
- #define check_string( X, STR ) \
- do \
- { \
- if( !( X ) ) \
- { \
- debug_print_assert( 0, #X, STR, __FILE__, __LINE__, __ROUTINE__ ); \
- } \
- \
- } while( 0 )
- #else
- #define check_string( X, STR )
- #endif
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined check_noerr
-
- @abstract Check that an error code is noErr (0).
-
- @discussion
-
- If the error code is non-0, this prints debugging information (actual expression string, file, line number,
- function name, etc.) using the default debugging output method.
-
- Code inside check_noerr() statements is not compiled into production builds.
-*/
-
-#if( DEBUG_OVERRIDE_APPLE_MACROS )
- #undef check_noerr
-#endif
-#if( !defined( check_noerr ) )
- #if( DEBUG )
- #define check_noerr( ERR ) \
- do \
- { \
- int_least32_t localErr; \
- \
- localErr = (int_least32_t)( ERR ); \
- if( localErr != 0 ) \
- { \
- debug_print_assert( localErr, NULL, NULL, __FILE__, __LINE__, __ROUTINE__ ); \
- } \
- \
- } while( 0 )
- #else
- #define check_noerr( ERR )
- #endif
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined check_noerr_string
-
- @abstract Check that an error code is noErr (0) with an explanation.
-
- @discussion
-
- If the error code is non-0, this prints debugging information (actual expression string, file, line number,
- function name, etc.) and a custom explanation string using the default debugging output method.
-
- Code inside check_noerr_string() statements is not compiled into production builds.
-*/
-
-#if( DEBUG_OVERRIDE_APPLE_MACROS )
- #undef check_noerr_string
-#endif
-#if( !defined( check_noerr_string ) )
- #if( DEBUG )
- #define check_noerr_string( ERR, STR ) \
- do \
- { \
- int_least32_t localErr; \
- \
- localErr = (int_least32_t)( ERR ); \
- if( localErr != 0 ) \
- { \
- debug_print_assert( localErr, NULL, STR, __FILE__, __LINE__, __ROUTINE__ ); \
- } \
- \
- } while( 0 )
- #else
- #define check_noerr_string( ERR, STR )
- #endif
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined check_translated_errno
-
- @abstract Check a condition and prints errno (if non-zero) to the log.
-
- @discussion
-
- Code inside check_translated_errno() statements is not compiled into production builds.
-*/
-
-#if( !defined( check_translated_errno ) )
- #if( DEBUG )
- #define check_translated_errno( TEST, ERRNO, ALTERNATE_ERROR ) \
- do \
- { \
- if( !( TEST ) ) \
- { \
- int_least32_t localErr; \
- \
- localErr = (int_least32_t)( ERRNO ); \
- localErr = ( localErr != 0 ) ? localErr : (int_least32_t)( ALTERNATE_ERROR ); \
- debug_print_assert( localErr, #TEST, NULL, __FILE__, __LINE__, __ROUTINE__ ); \
- } \
- \
- } while( 0 )
- #else
- #define check_translated_errno( TEST, ERRNO, ALTERNATE_ERROR )
- #endif
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined check_ptr_overlap
-
- @abstract Checks that two ptrs do not overlap.
-*/
-
-#define check_ptr_overlap( P1, P1_SIZE, P2, P2_SIZE ) \
- do \
- { \
- check( !( ( (uintptr_t)( P1 ) >= (uintptr_t)( P2 ) ) && \
- ( (uintptr_t)( P1 ) < ( ( (uintptr_t)( P2 ) ) + ( P2_SIZE ) ) ) ) ); \
- check( !( ( (uintptr_t)( P2 ) >= (uintptr_t)( P1 ) ) && \
- ( (uintptr_t)( P2 ) < ( ( (uintptr_t)( P1 ) ) + ( P1_SIZE ) ) ) ) ); \
- \
- } while( 0 )
-
-#if 0
-#pragma mark == require macros ==
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined require
-
- @abstract Requires that an expression evaluate to true.
-
- @discussion
-
- If expression evalulates to false, this prints debugging information (actual expression string, file, line number,
- function name, etc.) using the default debugging output method then jumps to a label.
-*/
-
-#if( DEBUG_OVERRIDE_APPLE_MACROS )
- #undef require
-#endif
-#if( !defined( require ) )
- #define require( X, LABEL ) \
- do \
- { \
- if( !( X ) ) \
- { \
- debug_print_assert( 0, #X, NULL, __FILE__, __LINE__, __ROUTINE__ ); \
- goto LABEL; \
- } \
- \
- } while( 0 )
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined require_string
-
- @abstract Requires that an expression evaluate to true with an explanation.
-
- @discussion
-
- If expression evalulates to false, this prints debugging information (actual expression string, file, line number,
- function name, etc.) and a custom explanation string using the default debugging output method then jumps to a label.
-*/
-
-#if( DEBUG_OVERRIDE_APPLE_MACROS )
- #undef require_string
-#endif
-#if( !defined( require_string ) )
- #define require_string( X, LABEL, STR ) \
- do \
- { \
- if( !( X ) ) \
- { \
- debug_print_assert( 0, #X, STR, __FILE__, __LINE__, __ROUTINE__ ); \
- goto LABEL; \
- } \
- \
- } while( 0 )
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined require_quiet
-
- @abstract Requires that an expression evaluate to true.
-
- @discussion
-
- If expression evalulates to false, this jumps to a label. No debugging information is printed.
-*/
-
-#if( DEBUG_OVERRIDE_APPLE_MACROS )
- #undef require_quiet
-#endif
-#if( !defined( require_quiet ) )
- #define require_quiet( X, LABEL ) \
- do \
- { \
- if( !( X ) ) \
- { \
- goto LABEL; \
- } \
- \
- } while( 0 )
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined require_noerr
-
- @abstract Require that an error code is noErr (0).
-
- @discussion
-
- If the error code is non-0, this prints debugging information (actual expression string, file, line number,
- function name, etc.) using the default debugging output method then jumps to a label.
-*/
-
-#if( DEBUG_OVERRIDE_APPLE_MACROS )
- #undef require_noerr
-#endif
-#if( !defined( require_noerr ) )
- #define require_noerr( ERR, LABEL ) \
- do \
- { \
- int_least32_t localErr; \
- \
- localErr = (int_least32_t)( ERR ); \
- if( localErr != 0 ) \
- { \
- debug_print_assert( localErr, NULL, NULL, __FILE__, __LINE__, __ROUTINE__ ); \
- goto LABEL; \
- } \
- \
- } while( 0 )
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined require_noerr_string
-
- @abstract Require that an error code is noErr (0).
-
- @discussion
-
- If the error code is non-0, this prints debugging information (actual expression string, file, line number,
- function name, etc.), and a custom explanation string using the default debugging output method using the
- default debugging output method then jumps to a label.
-*/
-
-#if( DEBUG_OVERRIDE_APPLE_MACROS )
- #undef require_noerr_string
-#endif
-#if( !defined( require_noerr_string ) )
- #define require_noerr_string( ERR, LABEL, STR ) \
- do \
- { \
- int_least32_t localErr; \
- \
- localErr = (int_least32_t)( ERR ); \
- if( localErr != 0 ) \
- { \
- debug_print_assert( localErr, NULL, STR, __FILE__, __LINE__, __ROUTINE__ ); \
- goto LABEL; \
- } \
- \
- } while( 0 )
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined require_noerr_action_string
-
- @abstract Require that an error code is noErr (0).
-
- @discussion
-
- If the error code is non-0, this prints debugging information (actual expression string, file, line number,
- function name, etc.), and a custom explanation string using the default debugging output method using the
- default debugging output method then executes an action and jumps to a label.
-*/
-
-#if( DEBUG_OVERRIDE_APPLE_MACROS )
- #undef require_noerr_action_string
-#endif
-#if( !defined( require_noerr_action_string ) )
- #define require_noerr_action_string( ERR, LABEL, ACTION, STR ) \
- do \
- { \
- int_least32_t localErr; \
- \
- localErr = (int_least32_t)( ERR ); \
- if( localErr != 0 ) \
- { \
- debug_print_assert( localErr, NULL, STR, __FILE__, __LINE__, __ROUTINE__ ); \
- { ACTION; } \
- goto LABEL; \
- } \
- \
- } while( 0 )
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined require_noerr_quiet
-
- @abstract Require that an error code is noErr (0).
-
- @discussion
-
- If the error code is non-0, this jumps to a label. No debugging information is printed.
-*/
-
-#if( DEBUG_OVERRIDE_APPLE_MACROS )
- #undef require_noerr_quiet
-#endif
-#if( !defined( require_noerr_quiet ) )
- #define require_noerr_quiet( ERR, LABEL ) \
- do \
- { \
- if( ( ERR ) != 0 ) \
- { \
- goto LABEL; \
- } \
- \
- } while( 0 )
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined require_noerr_action
-
- @abstract Require that an error code is noErr (0) with an action to execute otherwise.
-
- @discussion
-
- If the error code is non-0, this prints debugging information (actual expression string, file, line number,
- function name, etc.) using the default debugging output method then executes an action and jumps to a label.
-*/
-
-#if( DEBUG_OVERRIDE_APPLE_MACROS )
- #undef require_noerr_action
-#endif
-#if( !defined( require_noerr_action ) )
- #define require_noerr_action( ERR, LABEL, ACTION ) \
- do \
- { \
- int_least32_t localErr; \
- \
- localErr = (int_least32_t)( ERR ); \
- if( localErr != 0 ) \
- { \
- debug_print_assert( localErr, NULL, NULL, __FILE__, __LINE__, __ROUTINE__ ); \
- { ACTION; } \
- goto LABEL; \
- } \
- \
- } while( 0 )
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined require_noerr_action_quiet
-
- @abstract Require that an error code is noErr (0) with an action to execute otherwise.
-
- @discussion
-
- If the error code is non-0, this executes an action and jumps to a label. No debugging information is printed.
-*/
-
-#if( DEBUG_OVERRIDE_APPLE_MACROS )
- #undef require_noerr_action_quiet
-#endif
-#if( !defined( require_noerr_action_quiet ) )
- #define require_noerr_action_quiet( ERR, LABEL, ACTION ) \
- do \
- { \
- if( ( ERR ) != 0 ) \
- { \
- { ACTION; } \
- goto LABEL; \
- } \
- \
- } while( 0 )
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined require_action
-
- @abstract Requires that an expression evaluate to true with an action to execute otherwise.
-
- @discussion
-
- If expression evalulates to false, this prints debugging information (actual expression string, file, line number,
- function name, etc.) using the default debugging output method then executes an action and jumps to a label.
-*/
-
-#if( DEBUG_OVERRIDE_APPLE_MACROS )
- #undef require_action
-#endif
-#if( !defined( require_action ) )
- #define require_action( X, LABEL, ACTION ) \
- do \
- { \
- if( !( X ) ) \
- { \
- debug_print_assert( 0, #X, NULL, __FILE__, __LINE__, __ROUTINE__ ); \
- { ACTION; } \
- goto LABEL; \
- } \
- \
- } while( 0 )
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined require_action_quiet
-
- @abstract Requires that an expression evaluate to true with an action to execute otherwise.
-
- @discussion
-
- If expression evalulates to false, this executes an action and jumps to a label. No debugging information is printed.
-*/
-
-#if( DEBUG_OVERRIDE_APPLE_MACROS )
- #undef require_action_quiet
-#endif
-#if( !defined( require_action_quiet ) )
- #define require_action_quiet( X, LABEL, ACTION ) \
- do \
- { \
- if( !( X ) ) \
- { \
- { ACTION; } \
- goto LABEL; \
- } \
- \
- } while( 0 )
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined require_action_string
-
- @abstract Requires that an expression evaluate to true with an explanation and action to execute otherwise.
-
- @discussion
-
- If expression evalulates to false, this prints debugging information (actual expression string, file, line number,
- function name, etc.) and a custom explanation string using the default debugging output method then executes an
- action and jumps to a label.
-*/
-
-#if( DEBUG_OVERRIDE_APPLE_MACROS )
- #undef require_action_string
-#endif
-#if( !defined( require_action_string ) )
- #define require_action_string( X, LABEL, ACTION, STR ) \
- do \
- { \
- if( !( X ) ) \
- { \
- debug_print_assert( 0, #X, STR, __FILE__, __LINE__, __ROUTINE__ ); \
- { ACTION; } \
- goto LABEL; \
- } \
- \
- } while( 0 )
-
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined require_throw
-
- @abstract Requires that an expression evaluates to true or an exception is thrown.
-
- @discussion
-
- If the expression evaluates to false, this prints debugging information (actual expression string, file,
- line number, function name, etc.) using the default debugging output method then throws an exception.
-*/
-
-#if( defined( __cplusplus ) )
- #define require_throw( X ) \
- do \
- { \
- if( !( X ) ) \
- { \
- debug_print_assert( 0, #X, NULL, __FILE__, __LINE__, __ROUTINE__ ); \
- throw kUnknownErr; \
- } \
- \
- } while( 0 )
-#endif
-
-#if 0
-#pragma mark == Design-By-Contract macros ==
-#endif
-
-//===========================================================================================================================
-// Design-By-Contract macros
-//===========================================================================================================================
-
-#define ensure( X ) check( X )
-#define ensure_string( X, STR ) check_string( X, STR )
-#define ensure_noerr( ERR ) check_noerr( ERR )
-#define ensure_noerr_string( ERR, STR ) check_noerr_string( ERR, STR )
-#define ensure_translated_errno( TEST, ERRNO, ALTERNATE_ERROR ) check_translated_errno( TEST, ERRNO, ALTERNATE_ERROR )
-
-// Note: Design-By-Contract "require" macros are already defined elsewhere.
-
-#if 0
-#pragma mark == Expect macros ==
-#endif
-
-//===========================================================================================================================
-// Expect macros
-//===========================================================================================================================
-
-// Expect macros allow code to include runtime checking of things that should not happen in shipping code (e.g. internal
-// programmer errors, such as a NULL parameter where it is not allowed). Once the code has been verified to work correctly
-// without asserting, the DEBUG_EXPECT_VERIFIED conditional can be set to eliminate the error checking entirely. It can
-// also be useful to measure the cost of error checking code by profiling with it enable and with it disabled.
-
-#if( DEBUG_EXPECT_VERIFIED )
- #define require_expect
- #define require_string_expect
- #define require_quiet_expect
- #define require_noerr_expect
- #define require_noerr_string_expect
- #define require_noerr_action_string_expect
- #define require_noerr_quiet_expect
- #define require_noerr_action_expect
- #define require_noerr_action_quiet_expect
- #define require_action_expect
- #define require_action_quiet_expect
- #define require_action_string_expect
-#else
- #define require_expect require
- #define require_string_expect require_string
- #define require_quiet_expect require_quiet
- #define require_noerr_expect require_noerr
- #define require_noerr_string_expect require_noerr_string
- #define require_noerr_action_string_expect require_noerr_action_string
- #define require_noerr_quiet_expect require_noerr_quiet
- #define require_noerr_action_expect require_noerr_action
- #define require_noerr_action_quiet_expect require_noerr_action_quiet
- #define require_action_expect require_action
- #define require_action_quiet_expect require_action_quiet
- #define require_action_string_expect require_action_string
-#endif
-
-#if 0
-#pragma mark == Output macros ==
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined debug_string
-
- @abstract Prints a debugging C string.
-*/
-
-#if( DEBUG_OVERRIDE_APPLE_MACROS )
- #undef debug_string
-#endif
-#if( !defined( debug_string ) )
- #if( DEBUG )
- #define debug_string( STR ) \
- do \
- { \
- debug_print_assert( 0, NULL, STR, __FILE__, __LINE__, __ROUTINE__ ); \
- \
- } while( 0 )
- #else
- #define debug_string( STR )
- #endif
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined debug_print_assert
-
- @abstract Prints an assertion.
-*/
-
-#if( DEBUG )
- #define debug_print_assert( ERROR_CODE, ASSERT_STRING, MESSAGE, FILENAME, LINE_NUMBER, FUNCTION ) \
- DebugPrintAssert( ERROR_CODE, ASSERT_STRING, MESSAGE, FILENAME, LINE_NUMBER, FUNCTION )
-#else
- #define debug_print_assert( ERROR_CODE, ASSERT_STRING, MESSAGE, FILENAME, LINE_NUMBER, FUNCTION )
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined dlog
-
- @abstract Prints a debug-only message.
-*/
-
-#if( DEBUG )
- #if( DEBUG_C99_VA_ARGS )
- #define dlog( ... ) DebugPrintF( __VA_ARGS__ )
- #elif( DEBUG_GNU_VA_ARGS )
- #define dlog( ARGS... ) DebugPrintF( ## ARGS )
- #else
- #define dlog DebugPrintF
- #endif
-#else
- #if( DEBUG_C99_VA_ARGS )
- #define dlog( ... )
- #elif( DEBUG_GNU_VA_ARGS )
- #define dlog( ARGS... )
- #else
- #define dlog while( 0 )
- #endif
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined dlogv
-
- @abstract Prints a debug-only message.
-*/
-
-#if( DEBUG )
- #define dlogv( LEVEL, FORMAT, LIST ) DebugPrintFVAList( ( LEVEL ), ( FORMAT ), ( LIST ) )
-#else
- #define dlogv( LEVEL, FORMAT, LIST )
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined dlogmem
-
- @abstract Prints a debug-only dump of memory.
-*/
-
-#if( DEBUG )
- #define dlogmem( LEVEL, PTR, SIZE ) \
- DebugHexDump( ( LEVEL ), 0, NULL, 0, 0, NULL, 0, ( PTR ), ( PTR ), ( SIZE ), kDebugFlagsNone, NULL, 0 )
-#else
- #define dlogmem( LEVEL, PTR, SIZE )
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined DebugNSLog
-
- @abstract Debug-only macro for the Cocoa NSLog function.
-*/
-
-#if( DEBUG )
- #if( DEBUG_C99_VA_ARGS )
- #define DebugNSLog( ... ) NSLog( __VA_ARGS__ )
- #elif( DEBUG_GNU_VA_ARGS )
- #define DebugNSLog( ARGS... ) NSLog( ## ARGS )
- #else
- #define DebugNSLog NSLog
- #endif
-#else
- #if( DEBUG_C99_VA_ARGS )
- #define DebugNSLog( ... )
- #elif( DEBUG_GNU_VA_ARGS )
- #define DebugNSLog( ARGS... )
- #else
- #define DebugNSLog while( 0 )
- #endif
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @defined DebugLogMsg
-
- @abstract Debug-only macro for the VxWorks logMsg function.
-*/
-
-#if( TARGET_OS_VXWORKS )
- #if( DEBUG )
- #define DebugLogMsg( LEVEL, FORMAT, P1, P2, P3, P4, P5, P6 ) \
- do \
- { \
- if( ( inLevel >= gDebugPrintLevelMin ) || ( inLevel <= gDebugPrintLevelMax ) ) \
- { \
- logMsg( ( FORMAT ), ( P1 ), ( P2 ), ( P3 ), ( P4 ), ( P5 ), ( P6 ) ); \
- } \
- \
- } while( 0 )
- #else
- #define DebugLogMsg( LEVEL, FORMAT, P1, P2, P3, P4, P5, P6 )
- #endif
-#else
- #define DebugLogMsg dlog
-#endif
-
-#if 0
-#pragma mark == Routines - General ==
-#endif
-
-#ifdef __cplusplus
- extern "C" {
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @function DebugInitialize
-
- @abstract Initializes the debugging library for a specific kind of output.
-
- @param inType
- @param varArg Variable number parameters, controlled by the "inType" parameter.
-*/
-
-#if( DEBUG )
- DEBUG_EXPORT OSStatus DebugInitialize( DebugOutputType inType, ... );
-#endif
-
-#if( DEBUG )
- #if( DEBUG_C99_VA_ARGS )
- #define debug_initialize( ... ) DebugInitialize( __VA_ARGS__ )
- #elif( DEBUG_GNU_VA_ARGS )
- #define debug_initialize( ARGS... ) DebugInitialize( ## ARGS )
- #else
- #define debug_initialize DebugInitialize
- #endif
-#else
- #if( DEBUG_C99_VA_ARGS )
- #define debug_initialize( ... )
- #elif( DEBUG_GNU_VA_ARGS )
- #define debug_initialize( ARGS... )
- #else
- #define debug_initialize while( 0 )
- #endif
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @function DebugFinalize
-
- @abstract Releases any resources used by the debugging library
-*/
-
-#if( DEBUG )
- DEBUG_EXPORT void DebugFinalize( void );
-#endif
-
-#if( DEBUG )
- #define debug_terminate() DebugFinalize()
-#else
- #define debug_terminate()
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @function DebugGetProperty
-
- @abstract Gets the specified property from the debugging library.
-*/
-
-#if( DEBUG )
- DEBUG_EXPORT OSStatus DebugGetProperty( DebugPropertyTag inTag, ... );
-#endif
-
-#if( DEBUG )
- #if( DEBUG_C99_VA_ARGS )
- #define debug_get_property( ... ) DebugGetProperty( __VA_ARGS__ )
- #elif( DEBUG_GNU_VA_ARGS )
- #define debug_get_property( ARGS... ) DebugGetProperty( ## ARGS )
- #else
- #define debug_get_property DebugGetProperty
- #endif
-#else
- #if( DEBUG_C99_VA_ARGS )
- #define debug_get_property( ... )
- #elif( DEBUG_GNU_VA_ARGS )
- #define debug_get_property( ARGS... )
- #else
- #define debug_get_property while( 0 )
- #endif
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @function DebugSetProperty
-
- @abstract Sets the specified property from the debugging library.
-*/
-
-#if( DEBUG )
- DEBUG_EXPORT OSStatus DebugSetProperty( DebugPropertyTag inTag, ... );
-#endif
-
-#if( DEBUG )
- #if( DEBUG_C99_VA_ARGS )
- #define debug_set_property( ... ) DebugSetProperty( __VA_ARGS__ )
- #elif( DEBUG_GNU_VA_ARGS )
- #define debug_set_property( ARGS... ) DebugSetProperty( ## ARGS )
- #else
- #define debug_set_property DebugSetProperty
- #endif
-#else
- #if( DEBUG_C99_VA_ARGS )
- #define debug_set_property( ... )
- #elif( DEBUG_GNU_VA_ARGS )
- #define debug_set_property( ARGS... )
- #else
- #define debug_set_property while( 0 )
- #endif
-#endif
-
-#if 0
-#pragma mark == Routines - Debugging Output ==
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @function DebugPrintF
-
- @abstract Prints a debug message with printf-style formatting.
-
- @param inLevel Error that generated this assert or noErr.
-
- @param inFormatString
- C string containing assertion text.
-
- @param VAR_ARG
- Variable number of arguments depending on the format string.
-
- @result Number of bytes printed or -1 on error.
-*/
-
-#if( DEBUG )
- DEBUG_EXPORT size_t DebugPrintF( DebugLevel inLevel, const char *inFormat, ... );
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @function DebugPrintFVAList
-
- @abstract va_list version of DebugPrintF. See DebugPrintF for more info.
-*/
-
-#if( DEBUG )
- DEBUG_EXPORT size_t DebugPrintFVAList( DebugLevel inLevel, const char *inFormat, va_list inArgs );
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @function DebugPrintAssert
-
- @abstract Prints a message describing the reason the (e.g. an assert failed), an optional error message,
- an optional source filename, an optional source line number.
-
- @param inErrorCode Error that generated this assert or noErr.
- @param inAssertString C string containing assertion text.
- @param inMessage C string containing a message about the assert.
- @param inFileName C string containing path of file where the error occurred.
- @param inLineNumber Line number in source file where the error occurred.
- @param inFunction C string containing name of function where assert occurred.
-
- @discussion
-
- Example output:
-
- [ASSERT] assert: "dataPtr != NULL" allocate memory for object failed
- [ASSERT] where: "MyFile.c", line 123, ("MyFunction")
-
- OR
-
- [ASSERT] error: -6728 (kNoMemoryErr)
- [ASSERT] where: "MyFile.c", line 123, ("MyFunction")
-*/
-
-#if( DEBUG )
- DEBUG_EXPORT void
- DebugPrintAssert(
- int_least32_t inErrorCode,
- const char * inAssertString,
- const char * inMessage,
- const char * inFilename,
- int_least32_t inLineNumber,
- const char * inFunction );
-#endif
-
-#if 0
-#pragma mark == Routines - Utilities ==
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @function DebugSNPrintF
-
- @abstract Debugging versions of standard C snprintf with extra features.
-
- @param sbuffer Buffer to receive result. Null terminated unless the buffer size is 0.
- @param buflen Size of the buffer including space for the null terminator.
- @param fmt printf-style format string.
- @param VAR_ARG Variable number of arguments depending on the format string.
-
- @result Number of characters written (minus the null terminator).
-
- @discussion
-
- Extra features over the standard C snprintf:
- <pre>
- 64-bit support for %d (%lld), %i (%lli), %u (%llu), %o (%llo), %x (%llx), and %b (%llb).
- %@ - Cocoa/CoreFoundation object. Param is the object. Strings are used directly. Others use CFCopyDescription.
- %a - Network Address: %.4a=IPv4, %.6a=Ethernet, %.8a Fibre Channel, %.16a=IPv6. Arg=ptr to network address.
- %#a - IPv4 or IPv6 mDNSAddr. Arg=ptr to mDNSAddr.
- %##a - IPv4 (if AF_INET defined) or IPv6 (if AF_INET6 defined) sockaddr. Arg=ptr to sockaddr.
- %b - Binary representation of integer (e.g. 01101011). Modifiers and arg=the same as %d, %x, etc.
- %C - Mac-style FourCharCode (e.g. 'APPL'). Arg=32-bit value to print as a Mac-style FourCharCode.
- %H - Hex Dump (e.g. "\x6b\xa7" -> "6B A7"). 1st arg=ptr, 2nd arg=size, 3rd arg=max size.
- %#H - Hex Dump & ASCII (e.g. "\x41\x62" -> "6B A7 'Ab'"). 1st arg=ptr, 2nd arg=size, 3rd arg=max size.
- %m - Error Message (e.g. 0 -> "kNoErr"). Modifiers and error code arg=the same as %d, %x, etc.
- %#s - Pascal-style length-prefixed string. Arg=ptr to string.
- %##s - DNS label-sequence name. Arg=ptr to name.
- %S - UTF-16 string, 0x0000 terminated. Host order if no BOM. Precision is UTF-16 count. Precision includes BOM.
- %#S - Big Endian UTF-16 string (unless BOM overrides). Otherwise, the same as %S.
- %##S - Little Endian UTF-16 string (unless BOM overrides). Otherwise, the same as %S.
- %U - Universally Unique Identifier (UUID) (e.g. 6ba7b810-9dad-11d1-80b4-00c04fd430c8). Arg=ptr to 16-byte UUID.
- </pre>
-*/
-
-#if( DEBUG )
- DEBUG_EXPORT size_t DebugSNPrintF(char *sbuffer, size_t buflen, const char *fmt, ...);
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @function DebugSNPrintFVAList
-
- @abstract va_list version of DebugSNPrintF. See DebugSNPrintF for more info.
-*/
-
-#if( DEBUG )
- DEBUG_EXPORT size_t DebugSNPrintFVAList(char *sbuffer, size_t buflen, const char *fmt, va_list arg);
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @function DebugGetErrorString
-
- @abstract Gets an error string from an error code.
-
- @param inStatus Error code to get the string for.
- @param inBuffer Optional buffer to copy the string to for non-static strings. May be null.
- @param inBufferSize Size of optional buffer. May be 0.
-
- @result C string containing error string for the error code. Guaranteed to be a valid, static string. If a
- buffer is supplied, the return value will always be a pointer to the supplied buffer, which will
- contain the best available description of the error code. If a buffer is not supplied, the return
- value will be the best available description of the error code that can be represented as a static
- string. This allows code that cannot use a temporary buffer to hold the result to still get a useful
- error string in most cases, but also allows code that can use a temporary buffer to get the best
- available description.
-*/
-
-#if( DEBUG )
- DEBUG_EXPORT const char * DebugGetErrorString( int_least32_t inErrorCode, char *inBuffer, size_t inBufferSize );
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @function DebugHexDump
-
- @abstract Hex dumps data to a string or to the output device.
-*/
-
-#if( DEBUG )
- DEBUG_EXPORT size_t
- DebugHexDump(
- DebugLevel inLevel,
- int inIndent,
- const char * inLabel,
- size_t inLabelSize,
- int inLabelMinWidth,
- const char * inType,
- size_t inTypeSize,
- const void * inDataStart,
- const void * inData,
- size_t inDataSize,
- DebugFlags inFlags,
- char * outBuffer,
- size_t inBufferSize );
-#endif
-
-#if( DEBUG )
- #define dloghex( LEVEL, INDENT, LABEL, LABEL_SIZE, LABEL_MIN_SIZE, TYPE, TYPE_SIZE, DATA_START, DATA, DATA_SIZE, FLAGS, BUFFER, BUFFER_SIZE ) \
- DebugHexDump( ( LEVEL ), (INDENT), ( LABEL ), ( LABEL_SIZE ), ( LABEL_MIN_SIZE ), ( TYPE ), ( TYPE_SIZE ), \
- ( DATA_START ), ( DATA ), ( DATA_SIZE ), ( FLAGS ), ( BUFFER ), ( BUFFER_SIZE ) )
-#else
- #define dloghex( LEVEL, INDENT, LABEL, LABEL_SIZE, LABEL_MIN_SIZE, TYPE, TYPE_SIZE, DATA_START, DATA, DATA_SIZE, FLAGS, BUFFER, BUFFER_SIZE )
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @function DebugTaskLevel
-
- @abstract Returns the current task level.
-
- @result Current task level
-
- @discussion
-
- Bit masks to isolate portions of the result (note that some masks may also need bit shifts to right justify):
- <pre>
- kDebugInterruptLevelMask - Indicates the current interrupt level (> 0 means interrupt time).
- kDebugInVBLTaskMask - Indicates if a VBL task is currently being executed.
- kDebugInDeferredTaskMask - Indicates if a Deferred Task is currently being executed.
- kDebugInSecondaryInterruptHandlerMask - Indicates if a Secondary Interrupt Handler is currently being executed.
- kDebugPageFaultFatalMask - Indicates if it is unsafe to cause a page fault (worse than interrupt time).
- kDebugMPTaskLevelMask - Indicates if being called from an MP task.
- kDebugInterruptDepthMask - 0 means task level, 1 means in interrupt, > 1 means in nested interrupt.
- </pre>
-
- Helpers:
- <pre>
- DebugExtractTaskLevelInterruptDepth() - Macro to extract interrupt depth from task level value.
- </pre>
-*/
-
-#if( DEBUG )
- DEBUG_EXPORT uint32_t DebugTaskLevel( void );
-#endif
-
-//---------------------------------------------------------------------------------------------------------------------------
-/*! @function DebugServicesTest
-
- @abstract Unit test.
-*/
-
-#if( DEBUG )
- DEBUG_EXPORT OSStatus DebugServicesTest( void );
-#endif
-
-#ifdef __cplusplus
- }
-#endif
-
-#endif // __DEBUG_SERVICES__
diff --git a/src/tools/mdnssd/GenLinkedList.c b/src/tools/mdnssd/GenLinkedList.c
deleted file mode 100644
index 6e371b9db52..00000000000
--- a/src/tools/mdnssd/GenLinkedList.c
+++ /dev/null
@@ -1,319 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
-
- File: GenLinkedList.c
-
- Contains: implementation of generic linked lists.
-
- Version: 1.0
- Tabs: 4 spaces
- */
-
-#include "GenLinkedList.h"
-
-
-// Return the link pointer contained within element e at offset o.
-#define GETLINK( e, o) ( *(void**)((char*) (e) + (o)) )
-
-// Assign the link pointer l to element e at offset o.
-#define ASSIGNLINK( e, l, o) ( *((void**)((char*) (e) + (o))) = (l))
-
-
-// GenLinkedList /////////////////////////////////////////////////////////////
-
-void InitLinkedList( GenLinkedList *pList, size_t linkOffset)
-/* Initialize the block of memory pointed to by pList as a linked list. */
-{
- pList->Head = NULL;
- pList->Tail = NULL;
- pList->LinkOffset = linkOffset;
-}
-
-
-void AddToTail( GenLinkedList *pList, void *elem)
-/* Add a linked list element to the tail of the list. */
-{
- if ( pList->Tail) {
- ASSIGNLINK( pList->Tail, elem, pList->LinkOffset);
- } else
- pList->Head = elem;
- ASSIGNLINK( elem, NULL, pList->LinkOffset);
-
- pList->Tail = elem;
-}
-
-
-void AddToHead( GenLinkedList *pList, void *elem)
-/* Add a linked list element to the head of the list. */
-{
- ASSIGNLINK( elem, pList->Head, pList->LinkOffset);
- if ( pList->Tail == NULL)
- pList->Tail = elem;
-
- pList->Head = elem;
-}
-
-
-int RemoveFromList( GenLinkedList *pList, void *elem)
-/* Remove a linked list element from the list. Return 0 if it was not found. */
-/* If the element is removed, its link will be set to NULL. */
-{
-void *iElem, *lastElem;
-
- for ( iElem = pList->Head, lastElem = NULL; iElem; iElem = GETLINK( iElem, pList->LinkOffset)) {
- if ( iElem == elem) {
- if ( lastElem) { // somewhere past the head
- ASSIGNLINK( lastElem, GETLINK( elem, pList->LinkOffset), pList->LinkOffset);
- } else { // at the head
- pList->Head = GETLINK( elem, pList->LinkOffset);
- }
- if ( pList->Tail == elem)
- pList->Tail = lastElem ? lastElem : NULL;
- ASSIGNLINK( elem, NULL, pList->LinkOffset); // maybe catch a stale reference bug.
- return 1;
- }
- lastElem = iElem;
- }
-
- return 0;
-}
-
-
-int ReplaceElem( GenLinkedList *pList, void *elemInList, void *newElem)
-/* Replace an element in the list with a new element, in the same position. */
-{
-void *iElem, *lastElem;
-
- if ( elemInList == NULL || newElem == NULL)
- return 0;
-
- for ( iElem = pList->Head, lastElem = NULL; iElem; iElem = GETLINK( iElem, pList->LinkOffset))
- {
- if ( iElem == elemInList)
- {
- ASSIGNLINK( newElem, GETLINK( elemInList, pList->LinkOffset), pList->LinkOffset);
- if ( lastElem) // somewhere past the head
- {
- ASSIGNLINK( lastElem, newElem, pList->LinkOffset);
- }
- else // at the head
- {
- pList->Head = newElem;
- }
- if ( pList->Tail == elemInList)
- pList->Tail = newElem;
- return 1;
- }
- lastElem = iElem;
- }
-
- return 0;
-}
-
-
-// GenDoubleLinkedList /////////////////////////////////////////////////////////
-
-void InitDoubleLinkedList( GenDoubleLinkedList *pList, size_t fwdLinkOffset,
- size_t backLinkOffset)
-/* Initialize the block of memory pointed to by pList as a double linked list. */
-{
- pList->Head = NULL;
- pList->Tail = NULL;
- pList->FwdLinkOffset = fwdLinkOffset;
- pList->BackLinkOffset = backLinkOffset;
-}
-
-
-void DLLAddToHead( GenDoubleLinkedList *pList, void *elem)
-/* Add a linked list element to the head of the list. */
-{
-void *pNext;
-
- pNext = pList->Head;
-
- // fix up the forward links
- ASSIGNLINK( elem, pList->Head, pList->FwdLinkOffset);
- pList->Head = elem;
-
- // fix up the backward links
- if ( pNext) {
- ASSIGNLINK( pNext, elem, pList->BackLinkOffset);
- } else
- pList->Tail = elem;
- ASSIGNLINK( elem, NULL, pList->BackLinkOffset);
-}
-
-
-void DLLRemoveFromList( GenDoubleLinkedList *pList, void *elem)
-/* Remove a linked list element from the list. */
-/* When the element is removed, its link will be set to NULL. */
-{
-void *pNext, *pPrev;
-
- pNext = GETLINK( elem, pList->FwdLinkOffset);
- pPrev = GETLINK( elem, pList->BackLinkOffset);
-
- // fix up the forward links
- if ( pPrev)
- ASSIGNLINK( pPrev, pNext, pList->FwdLinkOffset);
- else
- pList->Head = pNext;
-
- // fix up the backward links
- if ( pNext)
- ASSIGNLINK( pNext, pPrev, pList->BackLinkOffset);
- else
- pList->Tail = pPrev;
-
- ASSIGNLINK( elem, NULL, pList->FwdLinkOffset);
- ASSIGNLINK( elem, NULL, pList->BackLinkOffset);
-}
-
-
-// GenLinkedOffsetList /////////////////////////////////////////////////////
-
-// Extract the Next offset from element
-#define GETOFFSET( e, o) ( *(size_t*)((char*) (e) + (o)) )
-
-static void AssignOffsetLink( void *elem, void *link, size_t linkOffset);
-
-
-static void AssignOffsetLink( void *elem, void *link, size_t linkOffset)
-// Assign link to elem as an offset from elem. Assign 0 to elem if link is NULL.
-{
- GETOFFSET( elem, linkOffset) = link ? (size_t) link - (size_t) elem : 0;
-}
-
-
-void *GetHeadPtr( GenLinkedOffsetList *pList)
-/* Return a pointer to the head element of a list, or NULL if none. */
-{
- return pList->Head ? ( (char*) (pList) + pList->Head) : NULL;
-}
-
-
-void *GetTailPtr( GenLinkedOffsetList *pList)
-/* Return a pointer to the tail element of a list, or NULL if none. */
-{
- return pList->Tail ? ( (char*) (pList) + pList->Tail) : NULL;
-}
-
-
-void *GetOffsetLink( GenLinkedOffsetList *pList, void *elem)
-/* Return the link pointer contained within element e for pList, or NULL if it is 0. */
-{
-size_t nextOffset;
-
- nextOffset = GETOFFSET( elem, pList->LinkOffset);
-
- return nextOffset ? (char*) elem + nextOffset : NULL;
-}
-
-
-void InitLinkedOffsetList( GenLinkedOffsetList *pList, size_t linkOffset)
-/* Initialize the block of memory pointed to by pList as a linked list. */
-{
- pList->Head = 0;
- pList->Tail = 0;
- pList->LinkOffset = linkOffset;
-}
-
-
-void OffsetAddToTail( GenLinkedOffsetList *pList, void *elem)
-/* Add a linked list element to the tail of the list. */
-{
- if ( pList->Tail) {
- AssignOffsetLink( GetTailPtr( pList), elem, pList->LinkOffset);
- } else
- pList->Head = (size_t) elem - (size_t) pList;
- AssignOffsetLink( elem, NULL, pList->LinkOffset);
-
- pList->Tail = (size_t) elem - (size_t) pList;
-}
-
-
-void OffsetAddToHead( GenLinkedOffsetList *pList, void *elem)
-/* Add a linked list element to the head of the list. */
-{
- AssignOffsetLink( elem, GetHeadPtr( pList), pList->LinkOffset);
- if ( pList->Tail == 0)
- pList->Tail = (size_t) elem - (size_t) pList;
-
- pList->Head = (size_t) elem - (size_t) pList;
-}
-
-
-int OffsetRemoveFromList( GenLinkedOffsetList *pList, void *elem)
-/* Remove a linked list element from the list. Return 0 if it was not found. */
-/* If the element is removed, its link will be set to NULL. */
-{
-void *iElem, *lastElem;
-
- for ( iElem = GetHeadPtr( pList), lastElem = NULL; iElem;
- iElem = GetOffsetLink( pList, iElem))
- {
- if ( iElem == elem) {
- if ( lastElem) { // somewhere past the head
- AssignOffsetLink( lastElem, GetOffsetLink( pList, elem), pList->LinkOffset);
- } else { // at the head
- iElem = GetOffsetLink( pList, elem);
- pList->Head = iElem ? (size_t) iElem - (size_t) pList : 0;
- }
- if ( GetTailPtr( pList) == elem)
- pList->Tail = lastElem ? (size_t) lastElem - (size_t) pList : 0;
- AssignOffsetLink( elem, NULL, pList->LinkOffset); // maybe catch a stale reference bug.
- return 1;
- }
- lastElem = iElem;
- }
-
- return 0;
-}
-
-
-int OffsetReplaceElem( GenLinkedOffsetList *pList, void *elemInList, void *newElem)
-/* Replace an element in the list with a new element, in the same position. */
-{
-void *iElem, *lastElem;
-
- if ( elemInList == NULL || newElem == NULL)
- return 0;
-
- for ( iElem = GetHeadPtr( pList), lastElem = NULL; iElem;
- iElem = GetOffsetLink( pList, iElem))
- {
- if ( iElem == elemInList)
- {
- AssignOffsetLink( newElem, GetOffsetLink( pList, elemInList), pList->LinkOffset);
- if ( lastElem) // somewhere past the head
- {
- AssignOffsetLink( lastElem, newElem, pList->LinkOffset);
- }
- else // at the head
- {
- pList->Head = (size_t) newElem - (size_t) pList;
- }
- if ( GetTailPtr( pList) == elemInList)
- pList->Tail = (size_t) newElem - (size_t) pList;
- return 1;
- }
- lastElem = iElem;
- }
-
- return 0;
-}
-
-
diff --git a/src/tools/mdnssd/GenLinkedList.h b/src/tools/mdnssd/GenLinkedList.h
deleted file mode 100644
index 4e177083c75..00000000000
--- a/src/tools/mdnssd/GenLinkedList.h
+++ /dev/null
@@ -1,90 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef __GenLinkedList__
-#define __GenLinkedList__
-
-
-#include <stddef.h>
-
-
-struct GenLinkedList
-{
- void *Head,
- *Tail;
- size_t LinkOffset;
-};
-typedef struct GenLinkedList GenLinkedList;
-
-
-void InitLinkedList( GenLinkedList *pList, size_t linkOffset);
-
-void AddToHead( GenLinkedList *pList, void *elem);
-void AddToTail( GenLinkedList *pList, void *elem);
-
-int RemoveFromList( GenLinkedList *pList, void *elem);
-
-int ReplaceElem( GenLinkedList *pList, void *elemInList, void *newElem);
-
-
-
-struct GenDoubleLinkedList
-{
- void *Head,
- *Tail;
- size_t FwdLinkOffset,
- BackLinkOffset;
-};
-typedef struct GenDoubleLinkedList GenDoubleLinkedList;
-
-
-void InitDoubleLinkedList( GenDoubleLinkedList *pList, size_t fwdLinkOffset,
- size_t backLinkOffset);
-
-void DLLAddToHead( GenDoubleLinkedList *pList, void *elem);
-
-void DLLRemoveFromList( GenDoubleLinkedList *pList, void *elem);
-
-
-
-/* A GenLinkedOffsetList is like a GenLinkedList that stores the *Next field as a signed */
-/* offset from the address of the beginning of the element, rather than as a pointer. */
-
-struct GenLinkedOffsetList
-{
- size_t Head,
- Tail;
- size_t LinkOffset;
-};
-typedef struct GenLinkedOffsetList GenLinkedOffsetList;
-
-
-void InitLinkedOffsetList( GenLinkedOffsetList *pList, size_t linkOffset);
-
-void *GetHeadPtr( GenLinkedOffsetList *pList);
-void *GetTailPtr( GenLinkedOffsetList *pList);
-void *GetOffsetLink( GenLinkedOffsetList *pList, void *elem);
-
-void OffsetAddToHead( GenLinkedOffsetList *pList, void *elem);
-void OffsetAddToTail( GenLinkedOffsetList *pList, void *elem);
-
-int OffsetRemoveFromList( GenLinkedOffsetList *pList, void *elem);
-
-int OffsetReplaceElem( GenLinkedOffsetList *pList, void *elemInList, void *newElem);
-
-
-#endif // __GenLinkedList__
diff --git a/src/tools/mdnssd/PlatformCommon.c b/src/tools/mdnssd/PlatformCommon.c
deleted file mode 100644
index 7a1985aa201..00000000000
--- a/src/tools/mdnssd/PlatformCommon.c
+++ /dev/null
@@ -1,196 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include <stdio.h> // Needed for fopen() etc.
-#include <unistd.h> // Needed for close()
-#include <string.h> // Needed for strlen() etc.
-#include <errno.h> // Needed for errno etc.
-#include <sys/socket.h> // Needed for socket() etc.
-#include <netinet/in.h> // Needed for sockaddr_in
-#include <syslog.h>
-
-#include "mDNSEmbeddedAPI.h" // Defines the interface provided to the client layer above
-#include "DNSCommon.h"
-#include "PlatformCommon.h"
-
-#ifdef NOT_HAVE_SOCKLEN_T
- typedef unsigned int socklen_t;
-#endif
-
-// Bind a UDP socket to find the source address to a destination
-mDNSexport void mDNSPlatformSourceAddrForDest(mDNSAddr *const src, const mDNSAddr *const dst)
- {
- union { struct sockaddr s; struct sockaddr_in a4; struct sockaddr_in6 a6; } addr;
- socklen_t len = sizeof(addr);
- socklen_t inner_len = 0;
- int sock = socket(AF_INET, SOCK_DGRAM, 0);
- src->type = mDNSAddrType_None;
- if (sock == -1) return;
- if (dst->type == mDNSAddrType_IPv4)
- {
- inner_len = sizeof(addr.a4);
- #ifndef NOT_HAVE_SA_LEN
- addr.a4.sin_len = inner_len;
- #endif
- addr.a4.sin_family = AF_INET;
- addr.a4.sin_port = 1; // Not important, any port will do
- addr.a4.sin_addr.s_addr = dst->ip.v4.NotAnInteger;
- }
- else if (dst->type == mDNSAddrType_IPv6)
- {
- inner_len = sizeof(addr.a6);
- #ifndef NOT_HAVE_SA_LEN
- addr.a6.sin6_len = inner_len;
- #endif
- addr.a6.sin6_family = AF_INET6;
- addr.a6.sin6_flowinfo = 0;
- addr.a6.sin6_port = 1; // Not important, any port will do
- addr.a6.sin6_addr = *(struct in6_addr*)&dst->ip.v6;
- addr.a6.sin6_scope_id = 0;
- }
- else return;
-
- if ((connect(sock, &addr.s, inner_len)) < 0)
- { LogMsg("mDNSPlatformSourceAddrForDest: connect %#a failed errno %d (%s)", dst, errno, strerror(errno)); goto exit; }
-
- if ((getsockname(sock, &addr.s, &len)) < 0)
- { LogMsg("mDNSPlatformSourceAddrForDest: getsockname failed errno %d (%s)", errno, strerror(errno)); goto exit; }
-
- src->type = dst->type;
- if (dst->type == mDNSAddrType_IPv4) src->ip.v4.NotAnInteger = addr.a4.sin_addr.s_addr;
- else src->ip.v6 = *(mDNSv6Addr*)&addr.a6.sin6_addr;
-exit:
- close(sock);
- }
-
-// dst must be at least MAX_ESCAPED_DOMAIN_NAME bytes, and option must be less than 32 bytes in length
-mDNSlocal mDNSBool GetConfigOption(char *dst, const char *option, FILE *f)
- {
- char buf[32+1+MAX_ESCAPED_DOMAIN_NAME]; // Option name, one space, option value
- unsigned int len = strlen(option);
- if (len + 1 + MAX_ESCAPED_DOMAIN_NAME > sizeof(buf)-1) { LogMsg("GetConfigOption: option %s too long", option); return mDNSfalse; }
- fseek(f, 0, SEEK_SET); // set position to beginning of stream
- while (fgets(buf, sizeof(buf), f)) // Read at most sizeof(buf)-1 bytes from file, and append '\0' C-string terminator
- {
- if (!strncmp(buf, option, len))
- {
- strncpy(dst, buf + len + 1, MAX_ESCAPED_DOMAIN_NAME-1);
- if (dst[MAX_ESCAPED_DOMAIN_NAME-1]) dst[MAX_ESCAPED_DOMAIN_NAME-1] = '\0';
- len = strlen(dst);
- if (len && dst[len-1] == '\n') dst[len-1] = '\0'; // chop newline
- return mDNStrue;
- }
- }
- debugf("Option %s not set", option);
- return mDNSfalse;
- }
-
-mDNSexport void ReadDDNSSettingsFromConfFile(mDNS *const m, const char *const filename, domainname *const hostname, domainname *const domain, mDNSBool *DomainDiscoveryDisabled)
- {
- char buf[MAX_ESCAPED_DOMAIN_NAME] = "";
- mStatus err;
- FILE *f = fopen(filename, "r");
-
- if (hostname) hostname->c[0] = 0;
- if (domain) domain->c[0] = 0;
- if (DomainDiscoveryDisabled) *DomainDiscoveryDisabled = mDNSfalse;
-
- if (f)
- {
- if (DomainDiscoveryDisabled && GetConfigOption(buf, "DomainDiscoveryDisabled", f) && !strcasecmp(buf, "true")) *DomainDiscoveryDisabled = mDNStrue;
- if (hostname && GetConfigOption(buf, "hostname", f) && !MakeDomainNameFromDNSNameString(hostname, buf)) goto badf;
- if (domain && GetConfigOption(buf, "zone", f) && !MakeDomainNameFromDNSNameString(domain, buf)) goto badf;
- buf[0] = 0;
- GetConfigOption(buf, "secret-64", f); // failure means no authentication
- fclose(f);
- f = NULL;
- }
- else
- {
- if (errno != ENOENT) LogMsg("ERROR: Config file exists, but cannot be opened.");
- return;
- }
-
- if (domain && domain->c[0] && buf[0])
- {
- DomainAuthInfo *info = (DomainAuthInfo*)mDNSPlatformMemAllocate(sizeof(*info));
- // for now we assume keyname = service reg domain and we use same key for service and hostname registration
- err = mDNS_SetSecretForDomain(m, info, domain, domain, buf, NULL, 0, NULL);
- if (err) LogMsg("ERROR: mDNS_SetSecretForDomain returned %d for domain %##s", err, domain->c);
- }
-
- return;
-
- badf:
- LogMsg("ERROR: malformatted config file");
- if (f) fclose(f);
- }
-
-#if MDNS_DEBUGMSGS
-mDNSexport void mDNSPlatformWriteDebugMsg(const char *msg)
- {
- fprintf(stderr,"%s\n", msg);
- fflush(stderr);
- }
-#endif
-
-mDNSexport void mDNSPlatformWriteLogMsg(const char *ident, const char *buffer, mDNSLogLevel_t loglevel)
- {
-#if APPLE_OSX_mDNSResponder && LogTimeStamps
- extern mDNS mDNSStorage;
- extern mDNSu32 mDNSPlatformClockDivisor;
- mDNSs32 t = mDNSStorage.timenow ? mDNSStorage.timenow : mDNSPlatformClockDivisor ? mDNS_TimeNow_NoLock(&mDNSStorage) : 0;
- int ms = ((t < 0) ? -t : t) % 1000;
-#endif
-
- if (mDNS_DebugMode) // In debug mode we write to stderr
- {
-#if APPLE_OSX_mDNSResponder && LogTimeStamps
- if (ident && ident[0] && mDNSPlatformClockDivisor)
- fprintf(stderr,"%8d.%03d: %s\n", (int)(t/1000), ms, buffer);
- else
-#endif
- fprintf(stderr,"%s\n", buffer);
- fflush(stderr);
- }
- else // else, in production mode, we write to syslog
- {
- static int log_inited = 0;
-
- int syslog_level = LOG_ERR;
- switch (loglevel)
- {
- case MDNS_LOG_MSG: syslog_level = LOG_ERR; break;
- case MDNS_LOG_OPERATION: syslog_level = LOG_WARNING; break;
- case MDNS_LOG_SPS: syslog_level = LOG_NOTICE; break;
- case MDNS_LOG_INFO: syslog_level = LOG_INFO; break;
- case MDNS_LOG_DEBUG: syslog_level = LOG_DEBUG; break;
- default:
- fprintf(stderr, "Unknown loglevel %d, assuming LOG_ERR\n", loglevel);
- fflush(stderr);
- }
-
- if (!log_inited) { openlog(ident, LOG_CONS, LOG_DAEMON); log_inited++; }
-
-#if APPLE_OSX_mDNSResponder && LogTimeStamps
- if (ident && ident[0] && mDNSPlatformClockDivisor)
- syslog(syslog_level, "%8d.%03d: %s", (int)(t/1000), ms, buffer);
- else
-#endif
- syslog(syslog_level, "%s", buffer);
- }
- }
diff --git a/src/tools/mdnssd/PlatformCommon.h b/src/tools/mdnssd/PlatformCommon.h
deleted file mode 100644
index 631e3d731a6..00000000000
--- a/src/tools/mdnssd/PlatformCommon.h
+++ /dev/null
@@ -1,18 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-extern void ReadDDNSSettingsFromConfFile(mDNS *const m, const char *const filename, domainname *const hostname, domainname *const domain, mDNSBool *DomainDiscoveryDisabled);
diff --git a/src/tools/mdnssd/PosixDaemon.c b/src/tools/mdnssd/PosixDaemon.c
deleted file mode 100644
index acea1adb023..00000000000
--- a/src/tools/mdnssd/PosixDaemon.c
+++ /dev/null
@@ -1,258 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2003-2004 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
-
- File: daemon.c
-
- Contains: main & associated Application layer for mDNSResponder on Linux.
-
- */
-
-#if __APPLE__
-// In Mac OS X 10.5 and later trying to use the daemon function gives a "'daemon' is deprecated"
-// error, which prevents compilation because we build with "-Werror".
-// Since this is supposed to be portable cross-platform code, we don't care that daemon is
-// deprecated on Mac OS X 10.5, so we use this preprocessor trick to eliminate the error message.
-#define daemon yes_we_know_that_daemon_is_deprecated_in_os_x_10_5_thankyou
-#endif
-
-#include <stdio.h>
-#include <string.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <signal.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <pwd.h>
-#include <sys/types.h>
-
-#if __APPLE__
-#undef daemon
-extern int daemon(int, int);
-#endif
-
-#include "mDNSEmbeddedAPI.h"
-#include "mDNSPosix.h"
-#include "mDNSUNP.h" // For daemon()
-#include "uds_daemon.h"
-#include "PlatformCommon.h"
-
-#define CONFIG_FILE "/etc/mdnsd.conf"
-static domainname DynDNSZone; // Default wide-area zone for service registration
-static domainname DynDNSHostname;
-
-#define RR_CACHE_SIZE 500
-static CacheEntity gRRCache[RR_CACHE_SIZE];
-static mDNS_PlatformSupport PlatformStorage;
-
-mDNSlocal void mDNS_StatusCallback(mDNS *const m, mStatus result)
- {
- (void)m; // Unused
- if (result == mStatus_NoError)
- {
- // On successful registration of dot-local mDNS host name, daemon may want to check if
- // any name conflict and automatic renaming took place, and if so, record the newly negotiated
- // name in persistent storage for next time. It should also inform the user of the name change.
- // On Mac OS X we store the current dot-local mDNS host name in the SCPreferences store,
- // and notify the user with a CFUserNotification.
- }
- else if (result == mStatus_ConfigChanged)
- {
- udsserver_handle_configchange(m);
- }
- else if (result == mStatus_GrowCache)
- {
- // Allocate another chunk of cache storage
- CacheEntity *storage = malloc(sizeof(CacheEntity) * RR_CACHE_SIZE);
- if (storage) mDNS_GrowCache(m, storage, RR_CACHE_SIZE);
- }
- }
-
-// %%% Reconfigure() probably belongs in the platform support layer (mDNSPosix.c), not the daemon cde
-// -- all client layers running on top of mDNSPosix.c need to handle network configuration changes,
-// not only the Unix Domain Socket Daemon
-
-static void Reconfigure(mDNS *m)
- {
- mDNSAddr DynDNSIP;
- const mDNSAddr dummy = { mDNSAddrType_IPv4, { { { 1, 1, 1, 1 } } } };;
- mDNS_SetPrimaryInterfaceInfo(m, NULL, NULL, NULL);
- if (ParseDNSServers(m, uDNS_SERVERS_FILE) < 0)
- LogMsg("Unable to parse DNS server list. Unicast DNS-SD unavailable");
- ReadDDNSSettingsFromConfFile(m, CONFIG_FILE, &DynDNSHostname, &DynDNSZone, NULL);
- mDNSPlatformSourceAddrForDest(&DynDNSIP, &dummy);
- if (DynDNSHostname.c[0]) mDNS_AddDynDNSHostName(m, &DynDNSHostname, NULL, NULL);
- if (DynDNSIP.type) mDNS_SetPrimaryInterfaceInfo(m, &DynDNSIP, NULL, NULL);
- mDNS_ConfigChanged(m);
- }
-
-// Do appropriate things at startup with command line arguments. Calls exit() if unhappy.
-mDNSlocal void ParseCmdLinArgs(int argc, char **argv)
- {
- if (argc > 1)
- {
- if (0 == strcmp(argv[1], "-debug")) mDNS_DebugMode = mDNStrue;
- else printf("Usage: %s [-debug]\n", argv[0]);
- }
-
- if (!mDNS_DebugMode)
- {
- int result = daemon(0, 0);
- if (result != 0) { LogMsg("Could not run as daemon - exiting"); exit(result); }
-#if __APPLE__
- LogMsg("The POSIX mdnsd should only be used on OS X for testing - exiting");
- exit(-1);
-#endif
- }
- }
-
-mDNSlocal void DumpStateLog(mDNS *const m)
-// Dump a little log of what we've been up to.
- {
- LogMsg("---- BEGIN STATE LOG ----");
- udsserver_info(m);
- LogMsg("---- END STATE LOG ----");
- }
-
-mDNSlocal mStatus MainLoop(mDNS *m) // Loop until we quit.
- {
- sigset_t signals;
- mDNSBool gotData = mDNSfalse;
-
- mDNSPosixListenForSignalInEventLoop(SIGINT);
- mDNSPosixListenForSignalInEventLoop(SIGTERM);
- mDNSPosixListenForSignalInEventLoop(SIGUSR1);
- mDNSPosixListenForSignalInEventLoop(SIGPIPE);
- mDNSPosixListenForSignalInEventLoop(SIGHUP) ;
-
- for (; ;)
- {
- // Work out how long we expect to sleep before the next scheduled task
- struct timeval timeout;
- mDNSs32 ticks;
-
- // Only idle if we didn't find any data the last time around
- if (!gotData)
- {
- mDNSs32 nextTimerEvent = mDNS_Execute(m);
- nextTimerEvent = udsserver_idle(nextTimerEvent);
- ticks = nextTimerEvent - mDNS_TimeNow(m);
- if (ticks < 1) ticks = 1;
- }
- else // otherwise call EventLoop again with 0 timemout
- ticks = 0;
-
- timeout.tv_sec = ticks / mDNSPlatformOneSecond;
- timeout.tv_usec = (ticks % mDNSPlatformOneSecond) * 1000000 / mDNSPlatformOneSecond;
-
- (void) mDNSPosixRunEventLoopOnce(m, &timeout, &signals, &gotData);
-
- if (sigismember(&signals, SIGHUP )) Reconfigure(m);
- if (sigismember(&signals, SIGUSR1)) DumpStateLog(m);
- // SIGPIPE happens when we try to write to a dead client; death should be detected soon in request_callback() and cleaned up.
- if (sigismember(&signals, SIGPIPE)) LogMsg("Received SIGPIPE - ignoring");
- if (sigismember(&signals, SIGINT) || sigismember(&signals, SIGTERM)) break;
- }
- return EINTR;
- }
-
-int main(int argc, char **argv)
- {
- mStatus err;
-
- ParseCmdLinArgs(argc, argv);
-
- LogMsg("%s starting", mDNSResponderVersionString);
-
- err = mDNS_Init(&mDNSStorage, &PlatformStorage, gRRCache, RR_CACHE_SIZE, mDNS_Init_AdvertiseLocalAddresses,
- mDNS_StatusCallback, mDNS_Init_NoInitCallbackContext);
-
- if (mStatus_NoError == err)
- err = udsserver_init(mDNSNULL, 0);
-
- Reconfigure(&mDNSStorage);
-
- // Now that we're finished with anything privileged, switch over to running as "nobody"
- if (mStatus_NoError == err)
- {
- const struct passwd *pw = getpwnam("nobody");
- if (pw != NULL)
- setuid(pw->pw_uid);
- else
- LogMsg("WARNING: mdnsd continuing as root because user \"nobody\" does not exist");
- }
-
- if (mStatus_NoError == err)
- err = MainLoop(&mDNSStorage);
-
- LogMsg("%s stopping", mDNSResponderVersionString);
-
- mDNS_Close(&mDNSStorage);
-
- if (udsserver_exit() < 0)
- LogMsg("ExitCallback: udsserver_exit failed");
-
- #if MDNS_DEBUGMSGS > 0
- printf("mDNSResponder exiting normally with %ld\n", err);
- #endif
-
- return err;
- }
-
-// uds_daemon support ////////////////////////////////////////////////////////////
-
-mStatus udsSupportAddFDToEventLoop(int fd, udsEventCallback callback, void *context, void **platform_data)
-/* Support routine for uds_daemon.c */
- {
- // Depends on the fact that udsEventCallback == mDNSPosixEventCallback
- (void) platform_data;
- return mDNSPosixAddFDToEventLoop(fd, callback, context);
- }
-
-int udsSupportReadFD(dnssd_sock_t fd, char *buf, int len, int flags, void *platform_data)
- {
- (void) platform_data;
- return recv(fd, buf, len, flags);
- }
-
-mStatus udsSupportRemoveFDFromEventLoop(int fd, void *platform_data) // Note: This also CLOSES the file descriptor
- {
- mStatus err = mDNSPosixRemoveFDFromEventLoop(fd);
- (void) platform_data;
- close(fd);
- return err;
- }
-
-mDNSexport void RecordUpdatedNiceLabel(mDNS *const m, mDNSs32 delay)
- {
- (void)m;
- (void)delay;
- // No-op, for now
- }
-
-#if _BUILDING_XCODE_PROJECT_
-// If the process crashes, then this string will be magically included in the automatically-generated crash log
-const char *__crashreporter_info__ = mDNSResponderVersionString_SCCS + 5;
-asm(".desc ___crashreporter_info__, 0x10");
-#endif
-
-// For convenience when using the "strings" command, this is the last thing in the file
-#if mDNSResponderVersion > 1
-mDNSexport const char mDNSResponderVersionString_SCCS[] = "@(#) mDNSResponder-" STRINGIFY(mDNSResponderVersion) " (" __DATE__ " " __TIME__ ")";
-#elif MDNS_VERSIONSTR_NODTS
-mDNSexport const char mDNSResponderVersionString_SCCS[] = "@(#) mDNSResponder (Engineering Build)";
-#else
-mDNSexport const char mDNSResponderVersionString_SCCS[] = "@(#) mDNSResponder (Engineering Build) (" __DATE__ " " __TIME__ ")";
-#endif
diff --git a/src/tools/mdnssd/dns_sd.h b/src/tools/mdnssd/dns_sd.h
deleted file mode 100644
index 3caa6a85865..00000000000
--- a/src/tools/mdnssd/dns_sd.h
+++ /dev/null
@@ -1,2434 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2003-2004, Apple Computer, Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of its
- * contributors may be used to endorse or promote products derived from this
- * software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-/*! @header DNS Service Discovery
- *
- * @discussion This section describes the functions, callbacks, and data structures
- * that make up the DNS Service Discovery API.
- *
- * The DNS Service Discovery API is part of Bonjour, Apple's implementation
- * of zero-configuration networking (ZEROCONF).
- *
- * Bonjour allows you to register a network service, such as a
- * printer or file server, so that it can be found by name or browsed
- * for by service type and domain. Using Bonjour, applications can
- * discover what services are available on the network, along with
- * all the information -- such as name, IP address, and port --
- * necessary to access a particular service.
- *
- * In effect, Bonjour combines the functions of a local DNS server and
- * AppleTalk. Bonjour allows applications to provide user-friendly printer
- * and server browsing, among other things, over standard IP networks.
- * This behavior is a result of combining protocols such as multicast and
- * DNS to add new functionality to the network (such as multicast DNS).
- *
- * Bonjour gives applications easy access to services over local IP
- * networks without requiring the service or the application to support
- * an AppleTalk or a Netbeui stack, and without requiring a DNS server
- * for the local network.
- */
-
-
-/* _DNS_SD_H contains the mDNSResponder version number for this header file, formatted as follows:
- * Major part of the build number * 10000 +
- * minor part of the build number * 100
- * For example, Mac OS X 10.4.9 has mDNSResponder-108.4, which would be represented as
- * version 1080400. This allows C code to do simple greater-than and less-than comparisons:
- * e.g. an application that requires the DNSServiceGetProperty() call (new in mDNSResponder-126) can check:
- *
- * #if _DNS_SD_H+0 >= 1260000
- * ... some C code that calls DNSServiceGetProperty() ...
- * #endif
- *
- * The version defined in this header file symbol allows for compile-time
- * checking, so that C code building with earlier versions of the header file
- * can avoid compile errors trying to use functions that aren't even defined
- * in those earlier versions. Similar checks may also be performed at run-time:
- * => weak linking -- to avoid link failures if run with an earlier
- * version of the library that's missing some desired symbol, or
- * => DNSServiceGetProperty(DaemonVersion) -- to verify whether the running daemon
- * ("system service" on Windows) meets some required minimum functionality level.
- */
-
-#ifndef _DNS_SD_H
-#define _DNS_SD_H 3331000
-
-#ifdef __cplusplus
- extern "C" {
-#endif
-
-/* Set to 1 if libdispatch is supported
- * Note: May also be set by project and/or Makefile
- */
-#ifndef _DNS_SD_LIBDISPATCH
-#define _DNS_SD_LIBDISPATCH 0
-#endif /* ndef _DNS_SD_LIBDISPATCH */
-
-/* standard calling convention under Win32 is __stdcall */
-/* Note: When compiling Intel EFI (Extensible Firmware Interface) under MS Visual Studio, the */
-/* _WIN32 symbol is defined by the compiler even though it's NOT compiling code for Windows32 */
-#if defined(_WIN32) && !defined(EFI32) && !defined(EFI64)
-#define DNSSD_API __stdcall
-#else
-#define DNSSD_API
-#endif
-
-/* stdint.h does not exist on FreeBSD 4.x; its types are defined in sys/types.h instead */
-#if defined(__FreeBSD__) && (__FreeBSD__ < 5)
-#include <sys/types.h>
-
-/* Likewise, on Sun, standard integer types are in sys/types.h */
-#elif defined(__sun__)
-#include <sys/types.h>
-
-/* EFI does not have stdint.h, or anything else equivalent */
-#elif defined(EFI32) || defined(EFI64) || defined(EFIX64)
-#include "Tiano.h"
-#if !defined(_STDINT_H_)
-typedef UINT8 uint8_t;
-typedef INT8 int8_t;
-typedef UINT16 uint16_t;
-typedef INT16 int16_t;
-typedef UINT32 uint32_t;
-typedef INT32 int32_t;
-#endif
-/* Windows has its own differences */
-#elif defined(_WIN32)
-#include <windows.h>
-#define _UNUSED
-#ifndef _MSL_STDINT_H
-typedef UINT8 uint8_t;
-typedef INT8 int8_t;
-typedef UINT16 uint16_t;
-typedef INT16 int16_t;
-typedef UINT32 uint32_t;
-typedef INT32 int32_t;
-#endif
-
-/* All other Posix platforms use stdint.h */
-#else
-#include <stdint.h>
-#endif
-
-#if _DNS_SD_LIBDISPATCH
-#include <dispatch/dispatch.h>
-#endif
-
-/* DNSServiceRef, DNSRecordRef
- *
- * Opaque internal data types.
- * Note: client is responsible for serializing access to these structures if
- * they are shared between concurrent threads.
- */
-
-typedef struct _DNSServiceRef_t *DNSServiceRef;
-typedef struct _DNSRecordRef_t *DNSRecordRef;
-
-struct sockaddr;
-
-/*! @enum General flags
- * Most DNS-SD API functions and callbacks include a DNSServiceFlags parameter.
- * As a general rule, any given bit in the 32-bit flags field has a specific fixed meaning,
- * regardless of the function or callback being used. For any given function or callback,
- * typically only a subset of the possible flags are meaningful, and all others should be zero.
- * The discussion section for each API call describes which flags are valid for that call
- * and callback. In some cases, for a particular call, it may be that no flags are currently
- * defined, in which case the DNSServiceFlags parameter exists purely to allow future expansion.
- * In all cases, developers should expect that in future releases, it is possible that new flag
- * values will be defined, and write code with this in mind. For example, code that tests
- * if (flags == kDNSServiceFlagsAdd) ...
- * will fail if, in a future release, another bit in the 32-bit flags field is also set.
- * The reliable way to test whether a particular bit is set is not with an equality test,
- * but with a bitwise mask:
- * if (flags & kDNSServiceFlagsAdd) ...
- */
-enum
- {
- kDNSServiceFlagsMoreComing = 0x1,
- /* MoreComing indicates to a callback that at least one more result is
- * queued and will be delivered following immediately after this one.
- * When the MoreComing flag is set, applications should not immediately
- * update their UI, because this can result in a great deal of ugly flickering
- * on the screen, and can waste a great deal of CPU time repeatedly updating
- * the screen with content that is then immediately erased, over and over.
- * Applications should wait until until MoreComing is not set, and then
- * update their UI when no more changes are imminent.
- * When MoreComing is not set, that doesn't mean there will be no more
- * answers EVER, just that there are no more answers immediately
- * available right now at this instant. If more answers become available
- * in the future they will be delivered as usual.
- */
-
- kDNSServiceFlagsAdd = 0x2,
- kDNSServiceFlagsDefault = 0x4,
- /* Flags for domain enumeration and browse/query reply callbacks.
- * "Default" applies only to enumeration and is only valid in
- * conjunction with "Add". An enumeration callback with the "Add"
- * flag NOT set indicates a "Remove", i.e. the domain is no longer
- * valid.
- */
-
- kDNSServiceFlagsNoAutoRename = 0x8,
- /* Flag for specifying renaming behavior on name conflict when registering
- * non-shared records. By default, name conflicts are automatically handled
- * by renaming the service. NoAutoRename overrides this behavior - with this
- * flag set, name conflicts will result in a callback. The NoAutorename flag
- * is only valid if a name is explicitly specified when registering a service
- * (i.e. the default name is not used.)
- */
-
- kDNSServiceFlagsShared = 0x10,
- kDNSServiceFlagsUnique = 0x20,
- /* Flag for registering individual records on a connected
- * DNSServiceRef. Shared indicates that there may be multiple records
- * with this name on the network (e.g. PTR records). Unique indicates that the
- * record's name is to be unique on the network (e.g. SRV records).
- */
-
- kDNSServiceFlagsBrowseDomains = 0x40,
- kDNSServiceFlagsRegistrationDomains = 0x80,
- /* Flags for specifying domain enumeration type in DNSServiceEnumerateDomains.
- * BrowseDomains enumerates domains recommended for browsing, RegistrationDomains
- * enumerates domains recommended for registration.
- */
-
- kDNSServiceFlagsLongLivedQuery = 0x100,
- /* Flag for creating a long-lived unicast query for the DNSServiceQueryRecord call. */
-
- kDNSServiceFlagsAllowRemoteQuery = 0x200,
- /* Flag for creating a record for which we will answer remote queries
- * (queries from hosts more than one hop away; hosts not directly connected to the local link).
- */
-
- kDNSServiceFlagsForceMulticast = 0x400,
- /* Flag for signifying that a query or registration should be performed exclusively via multicast
- * DNS, even for a name in a domain (e.g. foo.apple.com.) that would normally imply unicast DNS.
- */
-
- kDNSServiceFlagsForce = 0x800,
- /* Flag for signifying a "stronger" variant of an operation.
- * Currently defined only for DNSServiceReconfirmRecord(), where it forces a record to
- * be removed from the cache immediately, instead of querying for a few seconds before
- * concluding that the record is no longer valid and then removing it. This flag should
- * be used with caution because if a service browsing PTR record is indeed still valid
- * on the network, forcing its removal will result in a user-interface flap -- the
- * discovered service instance will disappear, and then re-appear moments later.
- */
-
- kDNSServiceFlagsReturnIntermediates = 0x1000,
- /* Flag for returning intermediate results.
- * For example, if a query results in an authoritative NXDomain (name does not exist)
- * then that result is returned to the client. However the query is not implicitly
- * cancelled -- it remains active and if the answer subsequently changes
- * (e.g. because a VPN tunnel is subsequently established) then that positive
- * result will still be returned to the client.
- * Similarly, if a query results in a CNAME record, then in addition to following
- * the CNAME referral, the intermediate CNAME result is also returned to the client.
- * When this flag is not set, NXDomain errors are not returned, and CNAME records
- * are followed silently without informing the client of the intermediate steps.
- * (In earlier builds this flag was briefly calledkDNSServiceFlagsReturnCNAME)
- */
-
- kDNSServiceFlagsNonBrowsable = 0x2000,
- /* A service registered with the NonBrowsable flag set can be resolved using
- * DNSServiceResolve(), but will not be discoverable using DNSServiceBrowse().
- * This is for cases where the name is actually a GUID; it is found by other means;
- * there is no end-user benefit to browsing to find a long list of opaque GUIDs.
- * Using the NonBrowsable flag creates SRV+TXT without the cost of also advertising
- * an associated PTR record.
- */
-
- kDNSServiceFlagsShareConnection = 0x4000,
- /* For efficiency, clients that perform many concurrent operations may want to use a
- * single Unix Domain Socket connection with the background daemon, instead of having a
- * separate connection for each independent operation. To use this mode, clients first
- * call DNSServiceCreateConnection(&MainRef) to initialize the main DNSServiceRef.
- * For each subsequent operation that is to share that same connection, the client copies
- * the MainRef, and then passes the address of that copy, setting the ShareConnection flag
- * to tell the library that this DNSServiceRef is not a typical uninitialized DNSServiceRef;
- * it's a copy of an existing DNSServiceRef whose connection information should be reused.
- *
- * For example:
- *
- * DNSServiceErrorType error;
- * DNSServiceRef MainRef;
- * error = DNSServiceCreateConnection(&MainRef);
- * if (error) ...
- * DNSServiceRef BrowseRef = MainRef; // Important: COPY the primary DNSServiceRef first...
- * error = DNSServiceBrowse(&BrowseRef, kDNSServiceFlagsShareConnection, ...); // then use the copy
- * if (error) ...
- * ...
- * DNSServiceRefDeallocate(BrowseRef); // Terminate the browse operation
- * DNSServiceRefDeallocate(MainRef); // Terminate the shared connection
- *
- * Notes:
- *
- * 1. Collective kDNSServiceFlagsMoreComing flag
- * When callbacks are invoked using a shared DNSServiceRef, the
- * kDNSServiceFlagsMoreComing flag applies collectively to *all* active
- * operations sharing the same parent DNSServiceRef. If the MoreComing flag is
- * set it means that there are more results queued on this parent DNSServiceRef,
- * but not necessarily more results for this particular callback function.
- * The implication of this for client programmers is that when a callback
- * is invoked with the MoreComing flag set, the code should update its
- * internal data structures with the new result, and set a variable indicating
- * that its UI needs to be updated. Then, later when a callback is eventually
- * invoked with the MoreComing flag not set, the code should update *all*
- * stale UI elements related to that shared parent DNSServiceRef that need
- * updating, not just the UI elements related to the particular callback
- * that happened to be the last one to be invoked.
- *
- * 2. Canceling operations and kDNSServiceFlagsMoreComing
- * Whenever you cancel any operation for which you had deferred UI updates
- * waiting because of a kDNSServiceFlagsMoreComing flag, you should perform
- * those deferred UI updates. This is because, after cancelling the operation,
- * you can no longer wait for a callback *without* MoreComing set, to tell
- * you do perform your deferred UI updates (the operation has been canceled,
- * so there will be no more callbacks). An implication of the collective
- * kDNSServiceFlagsMoreComing flag for shared connections is that this
- * guideline applies more broadly -- any time you cancel an operation on
- * a shared connection, you should perform all deferred UI updates for all
- * operations sharing that connection. This is because the MoreComing flag
- * might have been referring to events coming for the operation you canceled,
- * which will now not be coming because the operation has been canceled.
- *
- * 3. Only share DNSServiceRef's created with DNSServiceCreateConnection
- * Calling DNSServiceCreateConnection(&ref) creates a special shareable DNSServiceRef.
- * DNSServiceRef's created by other calls like DNSServiceBrowse() or DNSServiceResolve()
- * cannot be shared by copying them and using kDNSServiceFlagsShareConnection.
- *
- * 4. Don't Double-Deallocate
- * Calling DNSServiceRefDeallocate(ref) for a particular operation's DNSServiceRef terminates
- * just that operation. Calling DNSServiceRefDeallocate(ref) for the main shared DNSServiceRef
- * (the parent DNSServiceRef, originally created by DNSServiceCreateConnection(&ref))
- * automatically terminates the shared connection and all operations that were still using it.
- * After doing this, DO NOT then attempt to deallocate any remaining subordinate DNSServiceRef's.
- * The memory used by those subordinate DNSServiceRef's has already been freed, so any attempt
- * to do a DNSServiceRefDeallocate (or any other operation) on them will result in accesses
- * to freed memory, leading to crashes or other equally undesirable results.
- *
- * 5. Thread Safety
- * The dns_sd.h API does not presuppose any particular threading model, and consequently
- * does no locking of its own (which would require linking some specific threading library).
- * If client code calls API routines on the same DNSServiceRef concurrently
- * from multiple threads, it is the client's responsibility to use a mutext
- * lock or take similar appropriate precautions to serialize those calls.
- */
-
- kDNSServiceFlagsSuppressUnusable = 0x8000,
- /*
- * This flag is meaningful only in DNSServiceQueryRecord which suppresses unusable queries on the
- * wire. If "hostname" is a wide-area unicast DNS hostname (i.e. not a ".local." name)
- * but this host has no routable IPv6 address, then the call will not try to look up IPv6 addresses
- * for "hostname", since any addresses it found would be unlikely to be of any use anyway. Similarly,
- * if this host has no routable IPv4 address, the call will not try to look up IPv4 addresses for
- * "hostname".
- */
-
- kDNSServiceFlagsTimeout = 0x10000,
- /*
- * When kDNServiceFlagsTimeout is passed to DNSServiceQueryRecord or DNSServiceGetAddrInfo, the query is
- * stopped after a certain number of seconds have elapsed. The time at which the query will be stopped
- * is determined by the system and cannot be configured by the user. The query will be stopped irrespective
- * of whether a response was given earlier or not. When the query is stopped, the callback will be called
- * with an error code of kDNSServiceErr_Timeout and a NULL sockaddr will be returned for DNSServiceGetAddrInfo
- * and zero length rdata will be returned for DNSServiceQueryRecord.
- */
-
- kDNSServiceFlagsIncludeP2P = 0x20000,
- /*
- * Include P2P interfaces when kDNSServiceInterfaceIndexAny is specified.
- * By default, specifying kDNSServiceInterfaceIndexAny does not include P2P interfaces.
- */
- kDNSServiceFlagsWakeOnResolve = 0x40000
- /*
- * This flag is meaningful only in DNSServiceResolve. When set, it tries to send a magic packet
- * to wake up the client.
- */
- };
-
-/* Possible protocols for DNSServiceNATPortMappingCreate(). */
-enum
- {
- kDNSServiceProtocol_IPv4 = 0x01,
- kDNSServiceProtocol_IPv6 = 0x02,
- /* 0x04 and 0x08 reserved for future internetwork protocols */
-
- kDNSServiceProtocol_UDP = 0x10,
- kDNSServiceProtocol_TCP = 0x20
- /* 0x40 and 0x80 reserved for future transport protocols, e.g. SCTP [RFC 2960]
- * or DCCP [RFC 4340]. If future NAT gateways are created that support port
- * mappings for these protocols, new constants will be defined here.
- */
- };
-
-/*
- * The values for DNS Classes and Types are listed in RFC 1035, and are available
- * on every OS in its DNS header file. Unfortunately every OS does not have the
- * same header file containing DNS Class and Type constants, and the names of
- * the constants are not consistent. For example, BIND 8 uses "T_A",
- * BIND 9 uses "ns_t_a", Windows uses "DNS_TYPE_A", etc.
- * For this reason, these constants are also listed here, so that code using
- * the DNS-SD programming APIs can use these constants, so that the same code
- * can compile on all our supported platforms.
- */
-
-enum
- {
- kDNSServiceClass_IN = 1 /* Internet */
- };
-
-enum
- {
- kDNSServiceType_A = 1, /* Host address. */
- kDNSServiceType_NS = 2, /* Authoritative server. */
- kDNSServiceType_MD = 3, /* Mail destination. */
- kDNSServiceType_MF = 4, /* Mail forwarder. */
- kDNSServiceType_CNAME = 5, /* Canonical name. */
- kDNSServiceType_SOA = 6, /* Start of authority zone. */
- kDNSServiceType_MB = 7, /* Mailbox domain name. */
- kDNSServiceType_MG = 8, /* Mail group member. */
- kDNSServiceType_MR = 9, /* Mail rename name. */
- kDNSServiceType_NULL = 10, /* Null resource record. */
- kDNSServiceType_WKS = 11, /* Well known service. */
- kDNSServiceType_PTR = 12, /* Domain name pointer. */
- kDNSServiceType_HINFO = 13, /* Host information. */
- kDNSServiceType_MINFO = 14, /* Mailbox information. */
- kDNSServiceType_MX = 15, /* Mail routing information. */
- kDNSServiceType_TXT = 16, /* One or more text strings (NOT "zero or more..."). */
- kDNSServiceType_RP = 17, /* Responsible person. */
- kDNSServiceType_AFSDB = 18, /* AFS cell database. */
- kDNSServiceType_X25 = 19, /* X_25 calling address. */
- kDNSServiceType_ISDN = 20, /* ISDN calling address. */
- kDNSServiceType_RT = 21, /* Router. */
- kDNSServiceType_NSAP = 22, /* NSAP address. */
- kDNSServiceType_NSAP_PTR = 23, /* Reverse NSAP lookup (deprecated). */
- kDNSServiceType_SIG = 24, /* Security signature. */
- kDNSServiceType_KEY = 25, /* Security key. */
- kDNSServiceType_PX = 26, /* X.400 mail mapping. */
- kDNSServiceType_GPOS = 27, /* Geographical position (withdrawn). */
- kDNSServiceType_AAAA = 28, /* IPv6 Address. */
- kDNSServiceType_LOC = 29, /* Location Information. */
- kDNSServiceType_NXT = 30, /* Next domain (security). */
- kDNSServiceType_EID = 31, /* Endpoint identifier. */
- kDNSServiceType_NIMLOC = 32, /* Nimrod Locator. */
- kDNSServiceType_SRV = 33, /* Server Selection. */
- kDNSServiceType_ATMA = 34, /* ATM Address */
- kDNSServiceType_NAPTR = 35, /* Naming Authority PoinTeR */
- kDNSServiceType_KX = 36, /* Key Exchange */
- kDNSServiceType_CERT = 37, /* Certification record */
- kDNSServiceType_A6 = 38, /* IPv6 Address (deprecated) */
- kDNSServiceType_DNAME = 39, /* Non-terminal DNAME (for IPv6) */
- kDNSServiceType_SINK = 40, /* Kitchen sink (experimental) */
- kDNSServiceType_OPT = 41, /* EDNS0 option (meta-RR) */
- kDNSServiceType_APL = 42, /* Address Prefix List */
- kDNSServiceType_DS = 43, /* Delegation Signer */
- kDNSServiceType_SSHFP = 44, /* SSH Key Fingerprint */
- kDNSServiceType_IPSECKEY = 45, /* IPSECKEY */
- kDNSServiceType_RRSIG = 46, /* RRSIG */
- kDNSServiceType_NSEC = 47, /* Denial of Existence */
- kDNSServiceType_DNSKEY = 48, /* DNSKEY */
- kDNSServiceType_DHCID = 49, /* DHCP Client Identifier */
- kDNSServiceType_NSEC3 = 50, /* Hashed Authenticated Denial of Existence */
- kDNSServiceType_NSEC3PARAM = 51, /* Hashed Authenticated Denial of Existence */
-
- kDNSServiceType_HIP = 55, /* Host Identity Protocol */
-
- kDNSServiceType_SPF = 99, /* Sender Policy Framework for E-Mail */
- kDNSServiceType_UINFO = 100, /* IANA-Reserved */
- kDNSServiceType_UID = 101, /* IANA-Reserved */
- kDNSServiceType_GID = 102, /* IANA-Reserved */
- kDNSServiceType_UNSPEC = 103, /* IANA-Reserved */
-
- kDNSServiceType_TKEY = 249, /* Transaction key */
- kDNSServiceType_TSIG = 250, /* Transaction signature. */
- kDNSServiceType_IXFR = 251, /* Incremental zone transfer. */
- kDNSServiceType_AXFR = 252, /* Transfer zone of authority. */
- kDNSServiceType_MAILB = 253, /* Transfer mailbox records. */
- kDNSServiceType_MAILA = 254, /* Transfer mail agent records. */
- kDNSServiceType_ANY = 255 /* Wildcard match. */
- };
-
-/* possible error code values */
-enum
- {
- kDNSServiceErr_NoError = 0,
- kDNSServiceErr_Unknown = -65537, /* 0xFFFE FFFF */
- kDNSServiceErr_NoSuchName = -65538,
- kDNSServiceErr_NoMemory = -65539,
- kDNSServiceErr_BadParam = -65540,
- kDNSServiceErr_BadReference = -65541,
- kDNSServiceErr_BadState = -65542,
- kDNSServiceErr_BadFlags = -65543,
- kDNSServiceErr_Unsupported = -65544,
- kDNSServiceErr_NotInitialized = -65545,
- kDNSServiceErr_AlreadyRegistered = -65547,
- kDNSServiceErr_NameConflict = -65548,
- kDNSServiceErr_Invalid = -65549,
- kDNSServiceErr_Firewall = -65550,
- kDNSServiceErr_Incompatible = -65551, /* client library incompatible with daemon */
- kDNSServiceErr_BadInterfaceIndex = -65552,
- kDNSServiceErr_Refused = -65553,
- kDNSServiceErr_NoSuchRecord = -65554,
- kDNSServiceErr_NoAuth = -65555,
- kDNSServiceErr_NoSuchKey = -65556,
- kDNSServiceErr_NATTraversal = -65557,
- kDNSServiceErr_DoubleNAT = -65558,
- kDNSServiceErr_BadTime = -65559, /* Codes up to here existed in Tiger */
- kDNSServiceErr_BadSig = -65560,
- kDNSServiceErr_BadKey = -65561,
- kDNSServiceErr_Transient = -65562,
- kDNSServiceErr_ServiceNotRunning = -65563, /* Background daemon not running */
- kDNSServiceErr_NATPortMappingUnsupported = -65564, /* NAT doesn't support NAT-PMP or UPnP */
- kDNSServiceErr_NATPortMappingDisabled = -65565, /* NAT supports NAT-PMP or UPnP but it's disabled by the administrator */
- kDNSServiceErr_NoRouter = -65566, /* No router currently configured (probably no network connectivity) */
- kDNSServiceErr_PollingMode = -65567,
- kDNSServiceErr_Timeout = -65568
-
- /* mDNS Error codes are in the range
- * FFFE FF00 (-65792) to FFFE FFFF (-65537) */
- };
-
-/* Maximum length, in bytes, of a service name represented as a */
-/* literal C-String, including the terminating NULL at the end. */
-
-#define kDNSServiceMaxServiceName 64
-
-/* Maximum length, in bytes, of a domain name represented as an *escaped* C-String */
-/* including the final trailing dot, and the C-String terminating NULL at the end. */
-
-#define kDNSServiceMaxDomainName 1009
-
-/*
- * Notes on DNS Name Escaping
- * -- or --
- * "Why is kDNSServiceMaxDomainName 1009, when the maximum legal domain name is 256 bytes?"
- *
- * All strings used in the DNS-SD APIs are UTF-8 strings. Apart from the exceptions noted below,
- * the APIs expect the strings to be properly escaped, using the conventional DNS escaping rules:
- *
- * '\\' represents a single literal '\' in the name
- * '\.' represents a single literal '.' in the name
- * '\ddd', where ddd is a three-digit decimal value from 000 to 255,
- * represents a single literal byte with that value.
- * A bare unescaped '.' is a label separator, marking a boundary between domain and subdomain.
- *
- * The exceptions, that do not use escaping, are the routines where the full
- * DNS name of a resource is broken, for convenience, into servicename/regtype/domain.
- * In these routines, the "servicename" is NOT escaped. It does not need to be, since
- * it is, by definition, just a single literal string. Any characters in that string
- * represent exactly what they are. The "regtype" portion is, technically speaking,
- * escaped, but since legal regtypes are only allowed to contain letters, digits,
- * and hyphens, there is nothing to escape, so the issue is moot. The "domain"
- * portion is also escaped, though most domains in use on the public Internet
- * today, like regtypes, don't contain any characters that need to be escaped.
- * As DNS-SD becomes more popular, rich-text domains for service discovery will
- * become common, so software should be written to cope with domains with escaping.
- *
- * The servicename may be up to 63 bytes of UTF-8 text (not counting the C-String
- * terminating NULL at the end). The regtype is of the form _service._tcp or
- * _service._udp, where the "service" part is 1-15 characters, which may be
- * letters, digits, or hyphens. The domain part of the three-part name may be
- * any legal domain, providing that the resulting servicename+regtype+domain
- * name does not exceed 256 bytes.
- *
- * For most software, these issues are transparent. When browsing, the discovered
- * servicenames should simply be displayed as-is. When resolving, the discovered
- * servicename/regtype/domain are simply passed unchanged to DNSServiceResolve().
- * When a DNSServiceResolve() succeeds, the returned fullname is already in
- * the correct format to pass to standard system DNS APIs such as res_query().
- * For converting from servicename/regtype/domain to a single properly-escaped
- * full DNS name, the helper function DNSServiceConstructFullName() is provided.
- *
- * The following (highly contrived) example illustrates the escaping process.
- * Suppose you have an service called "Dr. Smith\Dr. Johnson", of type "_ftp._tcp"
- * in subdomain "4th. Floor" of subdomain "Building 2" of domain "apple.com."
- * The full (escaped) DNS name of this service's SRV record would be:
- * Dr\.\032Smith\\Dr\.\032Johnson._ftp._tcp.4th\.\032Floor.Building\0322.apple.com.
- */
-
-
-/*
- * Constants for specifying an interface index
- *
- * Specific interface indexes are identified via a 32-bit unsigned integer returned
- * by the if_nametoindex() family of calls.
- *
- * If the client passes 0 for interface index, that means "do the right thing",
- * which (at present) means, "if the name is in an mDNS local multicast domain
- * (e.g. 'local.', '254.169.in-addr.arpa.', '{8,9,A,B}.E.F.ip6.arpa.') then multicast
- * on all applicable interfaces, otherwise send via unicast to the appropriate
- * DNS server." Normally, most clients will use 0 for interface index to
- * automatically get the default sensible behaviour.
- *
- * If the client passes a positive interface index, then for multicast names that
- * indicates to do the operation only on that one interface. For unicast names the
- * interface index is ignored unless kDNSServiceFlagsForceMulticast is also set.
- *
- * If the client passes kDNSServiceInterfaceIndexLocalOnly when registering
- * a service, then that service will be found *only* by other local clients
- * on the same machine that are browsing using kDNSServiceInterfaceIndexLocalOnly
- * or kDNSServiceInterfaceIndexAny.
- * If a client has a 'private' service, accessible only to other processes
- * running on the same machine, this allows the client to advertise that service
- * in a way such that it does not inadvertently appear in service lists on
- * all the other machines on the network.
- *
- * If the client passes kDNSServiceInterfaceIndexLocalOnly when browsing
- * then it will find *all* records registered on that same local machine.
- * Clients explicitly wishing to discover *only* LocalOnly services can
- * accomplish this by inspecting the interfaceIndex of each service reported
- * to their DNSServiceBrowseReply() callback function, and discarding those
- * where the interface index is not kDNSServiceInterfaceIndexLocalOnly.
- *
- * kDNSServiceInterfaceIndexP2P is meaningful only in Browse, QueryRecord,
- * and Resolve operations. It should not be used in other DNSService APIs.
- *
- * - If kDNSServiceInterfaceIndexP2P is passed to DNSServiceBrowse or
- * DNSServiceQueryRecord, it restricts the operation to P2P.
- *
- * - If kDNSServiceInterfaceIndexP2P is passed to DNSServiceResolve, it is
- * mapped internally to kDNSServiceInterfaceIndexAny, because resolving
- * a P2P service may create and/or enable an interface whose index is not
- * known a priori. The resolve callback will indicate the index of the
- * interface via which the service can be accessed.
- *
- * If applications pass kDNSServiceInterfaceIndexAny to DNSServiceBrowse
- * or DNSServiceQueryRecord, they must set the kDNSServiceFlagsIncludeP2P flag
- * to include P2P. In this case, if a service instance or the record being queried
- * is found over P2P, the resulting ADD event will indicate kDNSServiceInterfaceIndexP2P
- * as the interface index.
- */
-
-#define kDNSServiceInterfaceIndexAny 0
-#define kDNSServiceInterfaceIndexLocalOnly ((uint32_t)-1)
-#define kDNSServiceInterfaceIndexUnicast ((uint32_t)-2)
-#define kDNSServiceInterfaceIndexP2P ((uint32_t)-3)
-
-typedef uint32_t DNSServiceFlags;
-typedef uint32_t DNSServiceProtocol;
-typedef int32_t DNSServiceErrorType;
-
-
-/*********************************************************************************************
- *
- * Version checking
- *
- *********************************************************************************************/
-
-/* DNSServiceGetProperty() Parameters:
- *
- * property: The requested property.
- * Currently the only property defined is kDNSServiceProperty_DaemonVersion.
- *
- * result: Place to store result.
- * For retrieving DaemonVersion, this should be the address of a uint32_t.
- *
- * size: Pointer to uint32_t containing size of the result location.
- * For retrieving DaemonVersion, this should be sizeof(uint32_t).
- * On return the uint32_t is updated to the size of the data returned.
- * For DaemonVersion, the returned size is always sizeof(uint32_t), but
- * future properties could be defined which return variable-sized results.
- *
- * return value: Returns kDNSServiceErr_NoError on success, or kDNSServiceErr_ServiceNotRunning
- * if the daemon (or "system service" on Windows) is not running.
- */
-
-DNSServiceErrorType DNSSD_API DNSServiceGetProperty
- (
- const char *property, /* Requested property (i.e. kDNSServiceProperty_DaemonVersion) */
- void *result, /* Pointer to place to store result */
- uint32_t *size /* size of result location */
- );
-
-/*
- * When requesting kDNSServiceProperty_DaemonVersion, the result pointer must point
- * to a 32-bit unsigned integer, and the size parameter must be set to sizeof(uint32_t).
- *
- * On return, the 32-bit unsigned integer contains the version number, formatted as follows:
- * Major part of the build number * 10000 +
- * minor part of the build number * 100
- *
- * For example, Mac OS X 10.4.9 has mDNSResponder-108.4, which would be represented as
- * version 1080400. This allows applications to do simple greater-than and less-than comparisons:
- * e.g. an application that requires at least mDNSResponder-108.4 can check:
- *
- * if (version >= 1080400) ...
- *
- * Example usage:
- *
- * uint32_t version;
- * uint32_t size = sizeof(version);
- * DNSServiceErrorType err = DNSServiceGetProperty(kDNSServiceProperty_DaemonVersion, &version, &size);
- * if (!err) printf("Bonjour version is %d.%d\n", version / 10000, version / 100 % 100);
- */
-
-#define kDNSServiceProperty_DaemonVersion "DaemonVersion"
-
-
-/*********************************************************************************************
- *
- * Unix Domain Socket access, DNSServiceRef deallocation, and data processing functions
- *
- *********************************************************************************************/
-
-/* DNSServiceRefSockFD()
- *
- * Access underlying Unix domain socket for an initialized DNSServiceRef.
- * The DNS Service Discovery implementation uses this socket to communicate between the client and
- * the mDNSResponder daemon. The application MUST NOT directly read from or write to this socket.
- * Access to the socket is provided so that it can be used as a kqueue event source, a CFRunLoop
- * event source, in a select() loop, etc. When the underlying event management subsystem (kqueue/
- * select/CFRunLoop etc.) indicates to the client that data is available for reading on the
- * socket, the client should call DNSServiceProcessResult(), which will extract the daemon's
- * reply from the socket, and pass it to the appropriate application callback. By using a run
- * loop or select(), results from the daemon can be processed asynchronously. Alternatively,
- * a client can choose to fork a thread and have it loop calling "DNSServiceProcessResult(ref);"
- * If DNSServiceProcessResult() is called when no data is available for reading on the socket, it
- * will block until data does become available, and then process the data and return to the caller.
- * When data arrives on the socket, the client is responsible for calling DNSServiceProcessResult(ref)
- * in a timely fashion -- if the client allows a large backlog of data to build up the daemon
- * may terminate the connection.
- *
- * sdRef: A DNSServiceRef initialized by any of the DNSService calls.
- *
- * return value: The DNSServiceRef's underlying socket descriptor, or -1 on
- * error.
- */
-
-int DNSSD_API DNSServiceRefSockFD(DNSServiceRef sdRef);
-
-
-/* DNSServiceProcessResult()
- *
- * Read a reply from the daemon, calling the appropriate application callback. This call will
- * block until the daemon's response is received. Use DNSServiceRefSockFD() in
- * conjunction with a run loop or select() to determine the presence of a response from the
- * server before calling this function to process the reply without blocking. Call this function
- * at any point if it is acceptable to block until the daemon's response arrives. Note that the
- * client is responsible for ensuring that DNSServiceProcessResult() is called whenever there is
- * a reply from the daemon - the daemon may terminate its connection with a client that does not
- * process the daemon's responses.
- *
- * sdRef: A DNSServiceRef initialized by any of the DNSService calls
- * that take a callback parameter.
- *
- * return value: Returns kDNSServiceErr_NoError on success, otherwise returns
- * an error code indicating the specific failure that occurred.
- */
-
-DNSServiceErrorType DNSSD_API DNSServiceProcessResult(DNSServiceRef sdRef);
-
-
-/* DNSServiceRefDeallocate()
- *
- * Terminate a connection with the daemon and free memory associated with the DNSServiceRef.
- * Any services or records registered with this DNSServiceRef will be deregistered. Any
- * Browse, Resolve, or Query operations called with this reference will be terminated.
- *
- * Note: If the reference's underlying socket is used in a run loop or select() call, it should
- * be removed BEFORE DNSServiceRefDeallocate() is called, as this function closes the reference's
- * socket.
- *
- * Note: If the reference was initialized with DNSServiceCreateConnection(), any DNSRecordRefs
- * created via this reference will be invalidated by this call - the resource records are
- * deregistered, and their DNSRecordRefs may not be used in subsequent functions. Similarly,
- * if the reference was initialized with DNSServiceRegister, and an extra resource record was
- * added to the service via DNSServiceAddRecord(), the DNSRecordRef created by the Add() call
- * is invalidated when this function is called - the DNSRecordRef may not be used in subsequent
- * functions.
- *
- * Note: This call is to be used only with the DNSServiceRef defined by this API. It is
- * not compatible with dns_service_discovery_ref objects defined in the legacy Mach-based
- * DNSServiceDiscovery.h API.
- *
- * sdRef: A DNSServiceRef initialized by any of the DNSService calls.
- *
- */
-
-void DNSSD_API DNSServiceRefDeallocate(DNSServiceRef sdRef);
-
-
-/*********************************************************************************************
- *
- * Domain Enumeration
- *
- *********************************************************************************************/
-
-/* DNSServiceEnumerateDomains()
- *
- * Asynchronously enumerate domains available for browsing and registration.
- *
- * The enumeration MUST be cancelled via DNSServiceRefDeallocate() when no more domains
- * are to be found.
- *
- * Note that the names returned are (like all of DNS-SD) UTF-8 strings,
- * and are escaped using standard DNS escaping rules.
- * (See "Notes on DNS Name Escaping" earlier in this file for more details.)
- * A graphical browser displaying a hierarchical tree-structured view should cut
- * the names at the bare dots to yield individual labels, then de-escape each
- * label according to the escaping rules, and then display the resulting UTF-8 text.
- *
- * DNSServiceDomainEnumReply Callback Parameters:
- *
- * sdRef: The DNSServiceRef initialized by DNSServiceEnumerateDomains().
- *
- * flags: Possible values are:
- * kDNSServiceFlagsMoreComing
- * kDNSServiceFlagsAdd
- * kDNSServiceFlagsDefault
- *
- * interfaceIndex: Specifies the interface on which the domain exists. (The index for a given
- * interface is determined via the if_nametoindex() family of calls.)
- *
- * errorCode: Will be kDNSServiceErr_NoError (0) on success, otherwise indicates
- * the failure that occurred (other parameters are undefined if errorCode is nonzero).
- *
- * replyDomain: The name of the domain.
- *
- * context: The context pointer passed to DNSServiceEnumerateDomains.
- *
- */
-
-typedef void (DNSSD_API *DNSServiceDomainEnumReply)
- (
- DNSServiceRef sdRef,
- DNSServiceFlags flags,
- uint32_t interfaceIndex,
- DNSServiceErrorType errorCode,
- const char *replyDomain,
- void *context
- );
-
-
-/* DNSServiceEnumerateDomains() Parameters:
- *
- * sdRef: A pointer to an uninitialized DNSServiceRef. If the call succeeds
- * then it initializes the DNSServiceRef, returns kDNSServiceErr_NoError,
- * and the enumeration operation will run indefinitely until the client
- * terminates it by passing this DNSServiceRef to DNSServiceRefDeallocate().
- *
- * flags: Possible values are:
- * kDNSServiceFlagsBrowseDomains to enumerate domains recommended for browsing.
- * kDNSServiceFlagsRegistrationDomains to enumerate domains recommended
- * for registration.
- *
- * interfaceIndex: If non-zero, specifies the interface on which to look for domains.
- * (the index for a given interface is determined via the if_nametoindex()
- * family of calls.) Most applications will pass 0 to enumerate domains on
- * all interfaces. See "Constants for specifying an interface index" for more details.
- *
- * callBack: The function to be called when a domain is found or the call asynchronously
- * fails.
- *
- * context: An application context pointer which is passed to the callback function
- * (may be NULL).
- *
- * return value: Returns kDNSServiceErr_NoError on success (any subsequent, asynchronous
- * errors are delivered to the callback), otherwise returns an error code indicating
- * the error that occurred (the callback is not invoked and the DNSServiceRef
- * is not initialized).
- */
-
-DNSServiceErrorType DNSSD_API DNSServiceEnumerateDomains
- (
- DNSServiceRef *sdRef,
- DNSServiceFlags flags,
- uint32_t interfaceIndex,
- DNSServiceDomainEnumReply callBack,
- void *context /* may be NULL */
- );
-
-
-/*********************************************************************************************
- *
- * Service Registration
- *
- *********************************************************************************************/
-
-/* Register a service that is discovered via Browse() and Resolve() calls.
- *
- * DNSServiceRegisterReply() Callback Parameters:
- *
- * sdRef: The DNSServiceRef initialized by DNSServiceRegister().
- *
- * flags: When a name is successfully registered, the callback will be
- * invoked with the kDNSServiceFlagsAdd flag set. When Wide-Area
- * DNS-SD is in use, it is possible for a single service to get
- * more than one success callback (e.g. one in the "local" multicast
- * DNS domain, and another in a wide-area unicast DNS domain).
- * If a successfully-registered name later suffers a name conflict
- * or similar problem and has to be deregistered, the callback will
- * be invoked with the kDNSServiceFlagsAdd flag not set. The callback
- * is *not* invoked in the case where the caller explicitly terminates
- * the service registration by calling DNSServiceRefDeallocate(ref);
- *
- * errorCode: Will be kDNSServiceErr_NoError on success, otherwise will
- * indicate the failure that occurred (including name conflicts,
- * if the kDNSServiceFlagsNoAutoRename flag was used when registering.)
- * Other parameters are undefined if errorCode is nonzero.
- *
- * name: The service name registered (if the application did not specify a name in
- * DNSServiceRegister(), this indicates what name was automatically chosen).
- *
- * regtype: The type of service registered, as it was passed to the callout.
- *
- * domain: The domain on which the service was registered (if the application did not
- * specify a domain in DNSServiceRegister(), this indicates the default domain
- * on which the service was registered).
- *
- * context: The context pointer that was passed to the callout.
- *
- */
-
-typedef void (DNSSD_API *DNSServiceRegisterReply)
- (
- DNSServiceRef sdRef,
- DNSServiceFlags flags,
- DNSServiceErrorType errorCode,
- const char *name,
- const char *regtype,
- const char *domain,
- void *context
- );
-
-
-/* DNSServiceRegister() Parameters:
- *
- * sdRef: A pointer to an uninitialized DNSServiceRef. If the call succeeds
- * then it initializes the DNSServiceRef, returns kDNSServiceErr_NoError,
- * and the registration will remain active indefinitely until the client
- * terminates it by passing this DNSServiceRef to DNSServiceRefDeallocate().
- *
- * interfaceIndex: If non-zero, specifies the interface on which to register the service
- * (the index for a given interface is determined via the if_nametoindex()
- * family of calls.) Most applications will pass 0 to register on all
- * available interfaces. See "Constants for specifying an interface index" for more details.
- *
- * flags: Indicates the renaming behavior on name conflict (most applications
- * will pass 0). See flag definitions above for details.
- *
- * name: If non-NULL, specifies the service name to be registered.
- * Most applications will not specify a name, in which case the computer
- * name is used (this name is communicated to the client via the callback).
- * If a name is specified, it must be 1-63 bytes of UTF-8 text.
- * If the name is longer than 63 bytes it will be automatically truncated
- * to a legal length, unless the NoAutoRename flag is set,
- * in which case kDNSServiceErr_BadParam will be returned.
- *
- * regtype: The service type followed by the protocol, separated by a dot
- * (e.g. "_ftp._tcp"). The service type must be an underscore, followed
- * by 1-15 characters, which may be letters, digits, or hyphens.
- * The transport protocol must be "_tcp" or "_udp". New service types
- * should be registered at <http://www.dns-sd.org/ServiceTypes.html>.
- *
- * Additional subtypes of the primary service type (where a service
- * type has defined subtypes) follow the primary service type in a
- * comma-separated list, with no additional spaces, e.g.
- * "_primarytype._tcp,_subtype1,_subtype2,_subtype3"
- * Subtypes provide a mechanism for filtered browsing: A client browsing
- * for "_primarytype._tcp" will discover all instances of this type;
- * a client browsing for "_primarytype._tcp,_subtype2" will discover only
- * those instances that were registered with "_subtype2" in their list of
- * registered subtypes.
- *
- * The subtype mechanism can be illustrated with some examples using the
- * dns-sd command-line tool:
- *
- * % dns-sd -R Simple _test._tcp "" 1001 &
- * % dns-sd -R Better _test._tcp,HasFeatureA "" 1002 &
- * % dns-sd -R Best _test._tcp,HasFeatureA,HasFeatureB "" 1003 &
- *
- * Now:
- * % dns-sd -B _test._tcp # will find all three services
- * % dns-sd -B _test._tcp,HasFeatureA # finds "Better" and "Best"
- * % dns-sd -B _test._tcp,HasFeatureB # finds only "Best"
- *
- * Subtype labels may be up to 63 bytes long, and may contain any eight-
- * bit byte values, including zero bytes. However, due to the nature of
- * using a C-string-based API, conventional DNS escaping must be used for
- * dots ('.'), commas (','), backslashes ('\') and zero bytes, as shown below:
- *
- * % dns-sd -R Test '_test._tcp,s\.one,s\,two,s\\three,s\000four' local 123
- *
- * domain: If non-NULL, specifies the domain on which to advertise the service.
- * Most applications will not specify a domain, instead automatically
- * registering in the default domain(s).
- *
- * host: If non-NULL, specifies the SRV target host name. Most applications
- * will not specify a host, instead automatically using the machine's
- * default host name(s). Note that specifying a non-NULL host does NOT
- * create an address record for that host - the application is responsible
- * for ensuring that the appropriate address record exists, or creating it
- * via DNSServiceRegisterRecord().
- *
- * port: The port, in network byte order, on which the service accepts connections.
- * Pass 0 for a "placeholder" service (i.e. a service that will not be discovered
- * by browsing, but will cause a name conflict if another client tries to
- * register that same name). Most clients will not use placeholder services.
- *
- * txtLen: The length of the txtRecord, in bytes. Must be zero if the txtRecord is NULL.
- *
- * txtRecord: The TXT record rdata. A non-NULL txtRecord MUST be a properly formatted DNS
- * TXT record, i.e. <length byte> <data> <length byte> <data> ...
- * Passing NULL for the txtRecord is allowed as a synonym for txtLen=1, txtRecord="",
- * i.e. it creates a TXT record of length one containing a single empty string.
- * RFC 1035 doesn't allow a TXT record to contain *zero* strings, so a single empty
- * string is the smallest legal DNS TXT record.
- * As with the other parameters, the DNSServiceRegister call copies the txtRecord
- * data; e.g. if you allocated the storage for the txtRecord parameter with malloc()
- * then you can safely free that memory right after the DNSServiceRegister call returns.
- *
- * callBack: The function to be called when the registration completes or asynchronously
- * fails. The client MAY pass NULL for the callback - The client will NOT be notified
- * of the default values picked on its behalf, and the client will NOT be notified of any
- * asynchronous errors (e.g. out of memory errors, etc.) that may prevent the registration
- * of the service. The client may NOT pass the NoAutoRename flag if the callback is NULL.
- * The client may still deregister the service at any time via DNSServiceRefDeallocate().
- *
- * context: An application context pointer which is passed to the callback function
- * (may be NULL).
- *
- * return value: Returns kDNSServiceErr_NoError on success (any subsequent, asynchronous
- * errors are delivered to the callback), otherwise returns an error code indicating
- * the error that occurred (the callback is never invoked and the DNSServiceRef
- * is not initialized).
- */
-
-DNSServiceErrorType DNSSD_API DNSServiceRegister
- (
- DNSServiceRef *sdRef,
- DNSServiceFlags flags,
- uint32_t interfaceIndex,
- const char *name, /* may be NULL */
- const char *regtype,
- const char *domain, /* may be NULL */
- const char *host, /* may be NULL */
- uint16_t port, /* In network byte order */
- uint16_t txtLen,
- const void *txtRecord, /* may be NULL */
- DNSServiceRegisterReply callBack, /* may be NULL */
- void *context /* may be NULL */
- );
-
-
-/* DNSServiceAddRecord()
- *
- * Add a record to a registered service. The name of the record will be the same as the
- * registered service's name.
- * The record can later be updated or deregistered by passing the RecordRef initialized
- * by this function to DNSServiceUpdateRecord() or DNSServiceRemoveRecord().
- *
- * Note that the DNSServiceAddRecord/UpdateRecord/RemoveRecord are *NOT* thread-safe
- * with respect to a single DNSServiceRef. If you plan to have multiple threads
- * in your program simultaneously add, update, or remove records from the same
- * DNSServiceRef, then it's the caller's responsibility to use a mutext lock
- * or take similar appropriate precautions to serialize those calls.
- *
- * Parameters;
- *
- * sdRef: A DNSServiceRef initialized by DNSServiceRegister().
- *
- * RecordRef: A pointer to an uninitialized DNSRecordRef. Upon succesfull completion of this
- * call, this ref may be passed to DNSServiceUpdateRecord() or DNSServiceRemoveRecord().
- * If the above DNSServiceRef is passed to DNSServiceRefDeallocate(), RecordRef is also
- * invalidated and may not be used further.
- *
- * flags: Currently ignored, reserved for future use.
- *
- * rrtype: The type of the record (e.g. kDNSServiceType_TXT, kDNSServiceType_SRV, etc)
- *
- * rdlen: The length, in bytes, of the rdata.
- *
- * rdata: The raw rdata to be contained in the added resource record.
- *
- * ttl: The time to live of the resource record, in seconds.
- * Most clients should pass 0 to indicate that the system should
- * select a sensible default value.
- *
- * return value: Returns kDNSServiceErr_NoError on success, otherwise returns an
- * error code indicating the error that occurred (the RecordRef is not initialized).
- */
-
-DNSServiceErrorType DNSSD_API DNSServiceAddRecord
- (
- DNSServiceRef sdRef,
- DNSRecordRef *RecordRef,
- DNSServiceFlags flags,
- uint16_t rrtype,
- uint16_t rdlen,
- const void *rdata,
- uint32_t ttl
- );
-
-
-/* DNSServiceUpdateRecord
- *
- * Update a registered resource record. The record must either be:
- * - The primary txt record of a service registered via DNSServiceRegister()
- * - A record added to a registered service via DNSServiceAddRecord()
- * - An individual record registered by DNSServiceRegisterRecord()
- *
- * Parameters:
- *
- * sdRef: A DNSServiceRef that was initialized by DNSServiceRegister()
- * or DNSServiceCreateConnection().
- *
- * RecordRef: A DNSRecordRef initialized by DNSServiceAddRecord, or NULL to update the
- * service's primary txt record.
- *
- * flags: Currently ignored, reserved for future use.
- *
- * rdlen: The length, in bytes, of the new rdata.
- *
- * rdata: The new rdata to be contained in the updated resource record.
- *
- * ttl: The time to live of the updated resource record, in seconds.
- * Most clients should pass 0 to indicate that the system should
- * select a sensible default value.
- *
- * return value: Returns kDNSServiceErr_NoError on success, otherwise returns an
- * error code indicating the error that occurred.
- */
-
-DNSServiceErrorType DNSSD_API DNSServiceUpdateRecord
- (
- DNSServiceRef sdRef,
- DNSRecordRef RecordRef, /* may be NULL */
- DNSServiceFlags flags,
- uint16_t rdlen,
- const void *rdata,
- uint32_t ttl
- );
-
-
-/* DNSServiceRemoveRecord
- *
- * Remove a record previously added to a service record set via DNSServiceAddRecord(), or deregister
- * an record registered individually via DNSServiceRegisterRecord().
- *
- * Parameters:
- *
- * sdRef: A DNSServiceRef initialized by DNSServiceRegister() (if the
- * record being removed was registered via DNSServiceAddRecord()) or by
- * DNSServiceCreateConnection() (if the record being removed was registered via
- * DNSServiceRegisterRecord()).
- *
- * recordRef: A DNSRecordRef initialized by a successful call to DNSServiceAddRecord()
- * or DNSServiceRegisterRecord().
- *
- * flags: Currently ignored, reserved for future use.
- *
- * return value: Returns kDNSServiceErr_NoError on success, otherwise returns an
- * error code indicating the error that occurred.
- */
-
-DNSServiceErrorType DNSSD_API DNSServiceRemoveRecord
- (
- DNSServiceRef sdRef,
- DNSRecordRef RecordRef,
- DNSServiceFlags flags
- );
-
-
-/*********************************************************************************************
- *
- * Service Discovery
- *
- *********************************************************************************************/
-
-/* Browse for instances of a service.
- *
- * DNSServiceBrowseReply() Parameters:
- *
- * sdRef: The DNSServiceRef initialized by DNSServiceBrowse().
- *
- * flags: Possible values are kDNSServiceFlagsMoreComing and kDNSServiceFlagsAdd.
- * See flag definitions for details.
- *
- * interfaceIndex: The interface on which the service is advertised. This index should
- * be passed to DNSServiceResolve() when resolving the service.
- *
- * errorCode: Will be kDNSServiceErr_NoError (0) on success, otherwise will
- * indicate the failure that occurred. Other parameters are undefined if
- * the errorCode is nonzero.
- *
- * serviceName: The discovered service name. This name should be displayed to the user,
- * and stored for subsequent use in the DNSServiceResolve() call.
- *
- * regtype: The service type, which is usually (but not always) the same as was passed
- * to DNSServiceBrowse(). One case where the discovered service type may
- * not be the same as the requested service type is when using subtypes:
- * The client may want to browse for only those ftp servers that allow
- * anonymous connections. The client will pass the string "_ftp._tcp,_anon"
- * to DNSServiceBrowse(), but the type of the service that's discovered
- * is simply "_ftp._tcp". The regtype for each discovered service instance
- * should be stored along with the name, so that it can be passed to
- * DNSServiceResolve() when the service is later resolved.
- *
- * domain: The domain of the discovered service instance. This may or may not be the
- * same as the domain that was passed to DNSServiceBrowse(). The domain for each
- * discovered service instance should be stored along with the name, so that
- * it can be passed to DNSServiceResolve() when the service is later resolved.
- *
- * context: The context pointer that was passed to the callout.
- *
- */
-
-typedef void (DNSSD_API *DNSServiceBrowseReply)
- (
- DNSServiceRef sdRef,
- DNSServiceFlags flags,
- uint32_t interfaceIndex,
- DNSServiceErrorType errorCode,
- const char *serviceName,
- const char *regtype,
- const char *replyDomain,
- void *context
- );
-
-
-/* DNSServiceBrowse() Parameters:
- *
- * sdRef: A pointer to an uninitialized DNSServiceRef. If the call succeeds
- * then it initializes the DNSServiceRef, returns kDNSServiceErr_NoError,
- * and the browse operation will run indefinitely until the client
- * terminates it by passing this DNSServiceRef to DNSServiceRefDeallocate().
- *
- * flags: Currently ignored, reserved for future use.
- *
- * interfaceIndex: If non-zero, specifies the interface on which to browse for services
- * (the index for a given interface is determined via the if_nametoindex()
- * family of calls.) Most applications will pass 0 to browse on all available
- * interfaces. See "Constants for specifying an interface index" for more details.
- *
- * regtype: The service type being browsed for followed by the protocol, separated by a
- * dot (e.g. "_ftp._tcp"). The transport protocol must be "_tcp" or "_udp".
- * A client may optionally specify a single subtype to perform filtered browsing:
- * e.g. browsing for "_primarytype._tcp,_subtype" will discover only those
- * instances of "_primarytype._tcp" that were registered specifying "_subtype"
- * in their list of registered subtypes.
- *
- * domain: If non-NULL, specifies the domain on which to browse for services.
- * Most applications will not specify a domain, instead browsing on the
- * default domain(s).
- *
- * callBack: The function to be called when an instance of the service being browsed for
- * is found, or if the call asynchronously fails.
- *
- * context: An application context pointer which is passed to the callback function
- * (may be NULL).
- *
- * return value: Returns kDNSServiceErr_NoError on success (any subsequent, asynchronous
- * errors are delivered to the callback), otherwise returns an error code indicating
- * the error that occurred (the callback is not invoked and the DNSServiceRef
- * is not initialized).
- */
-
-DNSServiceErrorType DNSSD_API DNSServiceBrowse
- (
- DNSServiceRef *sdRef,
- DNSServiceFlags flags,
- uint32_t interfaceIndex,
- const char *regtype,
- const char *domain, /* may be NULL */
- DNSServiceBrowseReply callBack,
- void *context /* may be NULL */
- );
-
-
-/* DNSServiceResolve()
- *
- * Resolve a service name discovered via DNSServiceBrowse() to a target host name, port number, and
- * txt record.
- *
- * Note: Applications should NOT use DNSServiceResolve() solely for txt record monitoring - use
- * DNSServiceQueryRecord() instead, as it is more efficient for this task.
- *
- * Note: When the desired results have been returned, the client MUST terminate the resolve by calling
- * DNSServiceRefDeallocate().
- *
- * Note: DNSServiceResolve() behaves correctly for typical services that have a single SRV record
- * and a single TXT record. To resolve non-standard services with multiple SRV or TXT records,
- * DNSServiceQueryRecord() should be used.
- *
- * DNSServiceResolveReply Callback Parameters:
- *
- * sdRef: The DNSServiceRef initialized by DNSServiceResolve().
- *
- * flags: Possible values: kDNSServiceFlagsMoreComing
- *
- * interfaceIndex: The interface on which the service was resolved.
- *
- * errorCode: Will be kDNSServiceErr_NoError (0) on success, otherwise will
- * indicate the failure that occurred. Other parameters are undefined if
- * the errorCode is nonzero.
- *
- * fullname: The full service domain name, in the form <servicename>.<protocol>.<domain>.
- * (This name is escaped following standard DNS rules, making it suitable for
- * passing to standard system DNS APIs such as res_query(), or to the
- * special-purpose functions included in this API that take fullname parameters.
- * See "Notes on DNS Name Escaping" earlier in this file for more details.)
- *
- * hosttarget: The target hostname of the machine providing the service. This name can
- * be passed to functions like gethostbyname() to identify the host's IP address.
- *
- * port: The port, in network byte order, on which connections are accepted for this service.
- *
- * txtLen: The length of the txt record, in bytes.
- *
- * txtRecord: The service's primary txt record, in standard txt record format.
- *
- * context: The context pointer that was passed to the callout.
- *
- * NOTE: In earlier versions of this header file, the txtRecord parameter was declared "const char *"
- * This is incorrect, since it contains length bytes which are values in the range 0 to 255, not -128 to +127.
- * Depending on your compiler settings, this change may cause signed/unsigned mismatch warnings.
- * These should be fixed by updating your own callback function definition to match the corrected
- * function signature using "const unsigned char *txtRecord". Making this change may also fix inadvertent
- * bugs in your callback function, where it could have incorrectly interpreted a length byte with value 250
- * as being -6 instead, with various bad consequences ranging from incorrect operation to software crashes.
- * If you need to maintain portable code that will compile cleanly with both the old and new versions of
- * this header file, you should update your callback function definition to use the correct unsigned value,
- * and then in the place where you pass your callback function to DNSServiceResolve(), use a cast to eliminate
- * the compiler warning, e.g.:
- * DNSServiceResolve(sd, flags, index, name, regtype, domain, (DNSServiceResolveReply)MyCallback, context);
- * This will ensure that your code compiles cleanly without warnings (and more importantly, works correctly)
- * with both the old header and with the new corrected version.
- *
- */
-
-typedef void (DNSSD_API *DNSServiceResolveReply)
- (
- DNSServiceRef sdRef,
- DNSServiceFlags flags,
- uint32_t interfaceIndex,
- DNSServiceErrorType errorCode,
- const char *fullname,
- const char *hosttarget,
- uint16_t port, /* In network byte order */
- uint16_t txtLen,
- const unsigned char *txtRecord,
- void *context
- );
-
-
-/* DNSServiceResolve() Parameters
- *
- * sdRef: A pointer to an uninitialized DNSServiceRef. If the call succeeds
- * then it initializes the DNSServiceRef, returns kDNSServiceErr_NoError,
- * and the resolve operation will run indefinitely until the client
- * terminates it by passing this DNSServiceRef to DNSServiceRefDeallocate().
- *
- * flags: Specifying kDNSServiceFlagsForceMulticast will cause query to be
- * performed with a link-local mDNS query, even if the name is an
- * apparently non-local name (i.e. a name not ending in ".local.")
- *
- * interfaceIndex: The interface on which to resolve the service. If this resolve call is
- * as a result of a currently active DNSServiceBrowse() operation, then the
- * interfaceIndex should be the index reported in the DNSServiceBrowseReply
- * callback. If this resolve call is using information previously saved
- * (e.g. in a preference file) for later use, then use interfaceIndex 0, because
- * the desired service may now be reachable via a different physical interface.
- * See "Constants for specifying an interface index" for more details.
- *
- * name: The name of the service instance to be resolved, as reported to the
- * DNSServiceBrowseReply() callback.
- *
- * regtype: The type of the service instance to be resolved, as reported to the
- * DNSServiceBrowseReply() callback.
- *
- * domain: The domain of the service instance to be resolved, as reported to the
- * DNSServiceBrowseReply() callback.
- *
- * callBack: The function to be called when a result is found, or if the call
- * asynchronously fails.
- *
- * context: An application context pointer which is passed to the callback function
- * (may be NULL).
- *
- * return value: Returns kDNSServiceErr_NoError on success (any subsequent, asynchronous
- * errors are delivered to the callback), otherwise returns an error code indicating
- * the error that occurred (the callback is never invoked and the DNSServiceRef
- * is not initialized).
- */
-
-DNSServiceErrorType DNSSD_API DNSServiceResolve
- (
- DNSServiceRef *sdRef,
- DNSServiceFlags flags,
- uint32_t interfaceIndex,
- const char *name,
- const char *regtype,
- const char *domain,
- DNSServiceResolveReply callBack,
- void *context /* may be NULL */
- );
-
-
-/*********************************************************************************************
- *
- * Querying Individual Specific Records
- *
- *********************************************************************************************/
-
-/* DNSServiceQueryRecord
- *
- * Query for an arbitrary DNS record.
- *
- * DNSServiceQueryRecordReply() Callback Parameters:
- *
- * sdRef: The DNSServiceRef initialized by DNSServiceQueryRecord().
- *
- * flags: Possible values are kDNSServiceFlagsMoreComing and
- * kDNSServiceFlagsAdd. The Add flag is NOT set for PTR records
- * with a ttl of 0, i.e. "Remove" events.
- *
- * interfaceIndex: The interface on which the query was resolved (the index for a given
- * interface is determined via the if_nametoindex() family of calls).
- * See "Constants for specifying an interface index" for more details.
- *
- * errorCode: Will be kDNSServiceErr_NoError on success, otherwise will
- * indicate the failure that occurred. Other parameters are undefined if
- * errorCode is nonzero.
- *
- * fullname: The resource record's full domain name.
- *
- * rrtype: The resource record's type (e.g. kDNSServiceType_PTR, kDNSServiceType_SRV, etc)
- *
- * rrclass: The class of the resource record (usually kDNSServiceClass_IN).
- *
- * rdlen: The length, in bytes, of the resource record rdata.
- *
- * rdata: The raw rdata of the resource record.
- *
- * ttl: If the client wishes to cache the result for performance reasons,
- * the TTL indicates how long the client may legitimately hold onto
- * this result, in seconds. After the TTL expires, the client should
- * consider the result no longer valid, and if it requires this data
- * again, it should be re-fetched with a new query. Of course, this
- * only applies to clients that cancel the asynchronous operation when
- * they get a result. Clients that leave the asynchronous operation
- * running can safely assume that the data remains valid until they
- * get another callback telling them otherwise.
- *
- * context: The context pointer that was passed to the callout.
- *
- */
-
-typedef void (DNSSD_API *DNSServiceQueryRecordReply)
- (
- DNSServiceRef sdRef,
- DNSServiceFlags flags,
- uint32_t interfaceIndex,
- DNSServiceErrorType errorCode,
- const char *fullname,
- uint16_t rrtype,
- uint16_t rrclass,
- uint16_t rdlen,
- const void *rdata,
- uint32_t ttl,
- void *context
- );
-
-
-/* DNSServiceQueryRecord() Parameters:
- *
- * sdRef: A pointer to an uninitialized DNSServiceRef. If the call succeeds
- * then it initializes the DNSServiceRef, returns kDNSServiceErr_NoError,
- * and the query operation will run indefinitely until the client
- * terminates it by passing this DNSServiceRef to DNSServiceRefDeallocate().
- *
- * flags: kDNSServiceFlagsForceMulticast or kDNSServiceFlagsLongLivedQuery.
- * Pass kDNSServiceFlagsLongLivedQuery to create a "long-lived" unicast
- * query in a non-local domain. Without setting this flag, unicast queries
- * will be one-shot - that is, only answers available at the time of the call
- * will be returned. By setting this flag, answers (including Add and Remove
- * events) that become available after the initial call is made will generate
- * callbacks. This flag has no effect on link-local multicast queries.
- *
- * interfaceIndex: If non-zero, specifies the interface on which to issue the query
- * (the index for a given interface is determined via the if_nametoindex()
- * family of calls.) Passing 0 causes the name to be queried for on all
- * interfaces. See "Constants for specifying an interface index" for more details.
- *
- * fullname: The full domain name of the resource record to be queried for.
- *
- * rrtype: The numerical type of the resource record to be queried for
- * (e.g. kDNSServiceType_PTR, kDNSServiceType_SRV, etc)
- *
- * rrclass: The class of the resource record (usually kDNSServiceClass_IN).
- *
- * callBack: The function to be called when a result is found, or if the call
- * asynchronously fails.
- *
- * context: An application context pointer which is passed to the callback function
- * (may be NULL).
- *
- * return value: Returns kDNSServiceErr_NoError on success (any subsequent, asynchronous
- * errors are delivered to the callback), otherwise returns an error code indicating
- * the error that occurred (the callback is never invoked and the DNSServiceRef
- * is not initialized).
- */
-
-DNSServiceErrorType DNSSD_API DNSServiceQueryRecord
- (
- DNSServiceRef *sdRef,
- DNSServiceFlags flags,
- uint32_t interfaceIndex,
- const char *fullname,
- uint16_t rrtype,
- uint16_t rrclass,
- DNSServiceQueryRecordReply callBack,
- void *context /* may be NULL */
- );
-
-
-/*********************************************************************************************
- *
- * Unified lookup of both IPv4 and IPv6 addresses for a fully qualified hostname
- *
- *********************************************************************************************/
-
-/* DNSServiceGetAddrInfo
- *
- * Queries for the IP address of a hostname by using either Multicast or Unicast DNS.
- *
- * DNSServiceGetAddrInfoReply() parameters:
- *
- * sdRef: The DNSServiceRef initialized by DNSServiceGetAddrInfo().
- *
- * flags: Possible values are kDNSServiceFlagsMoreComing and
- * kDNSServiceFlagsAdd.
- *
- * interfaceIndex: The interface to which the answers pertain.
- *
- * errorCode: Will be kDNSServiceErr_NoError on success, otherwise will
- * indicate the failure that occurred. Other parameters are
- * undefined if errorCode is nonzero.
- *
- * hostname: The fully qualified domain name of the host to be queried for.
- *
- * address: IPv4 or IPv6 address.
- *
- * ttl: If the client wishes to cache the result for performance reasons,
- * the TTL indicates how long the client may legitimately hold onto
- * this result, in seconds. After the TTL expires, the client should
- * consider the result no longer valid, and if it requires this data
- * again, it should be re-fetched with a new query. Of course, this
- * only applies to clients that cancel the asynchronous operation when
- * they get a result. Clients that leave the asynchronous operation
- * running can safely assume that the data remains valid until they
- * get another callback telling them otherwise.
- *
- * context: The context pointer that was passed to the callout.
- *
- */
-
-typedef void (DNSSD_API *DNSServiceGetAddrInfoReply)
- (
- DNSServiceRef sdRef,
- DNSServiceFlags flags,
- uint32_t interfaceIndex,
- DNSServiceErrorType errorCode,
- const char *hostname,
- const struct sockaddr *address,
- uint32_t ttl,
- void *context
- );
-
-
-/* DNSServiceGetAddrInfo() Parameters:
- *
- * sdRef: A pointer to an uninitialized DNSServiceRef. If the call succeeds then it
- * initializes the DNSServiceRef, returns kDNSServiceErr_NoError, and the query
- * begins and will last indefinitely until the client terminates the query
- * by passing this DNSServiceRef to DNSServiceRefDeallocate().
- *
- * flags: kDNSServiceFlagsForceMulticast or kDNSServiceFlagsLongLivedQuery.
- * Pass kDNSServiceFlagsLongLivedQuery to create a "long-lived" unicast
- * query in a non-local domain. Without setting this flag, unicast queries
- * will be one-shot - that is, only answers available at the time of the call
- * will be returned. By setting this flag, answers (including Add and Remove
- * events) that become available after the initial call is made will generate
- * callbacks. This flag has no effect on link-local multicast queries.
- *
- * interfaceIndex: The interface on which to issue the query. Passing 0 causes the query to be
- * sent on all active interfaces via Multicast or the primary interface via Unicast.
- *
- * protocol: Pass in kDNSServiceProtocol_IPv4 to look up IPv4 addresses, or kDNSServiceProtocol_IPv6
- * to look up IPv6 addresses, or both to look up both kinds. If neither flag is
- * set, the system will apply an intelligent heuristic, which is (currently)
- * that it will attempt to look up both, except:
- *
- * * If "hostname" is a wide-area unicast DNS hostname (i.e. not a ".local." name)
- * but this host has no routable IPv6 address, then the call will not try to
- * look up IPv6 addresses for "hostname", since any addresses it found would be
- * unlikely to be of any use anyway. Similarly, if this host has no routable
- * IPv4 address, the call will not try to look up IPv4 addresses for "hostname".
- *
- * hostname: The fully qualified domain name of the host to be queried for.
- *
- * callBack: The function to be called when the query succeeds or fails asynchronously.
- *
- * context: An application context pointer which is passed to the callback function
- * (may be NULL).
- *
- * return value: Returns kDNSServiceErr_NoError on success (any subsequent, asynchronous
- * errors are delivered to the callback), otherwise returns an error code indicating
- * the error that occurred.
- */
-
-DNSServiceErrorType DNSSD_API DNSServiceGetAddrInfo
- (
- DNSServiceRef *sdRef,
- DNSServiceFlags flags,
- uint32_t interfaceIndex,
- DNSServiceProtocol protocol,
- const char *hostname,
- DNSServiceGetAddrInfoReply callBack,
- void *context /* may be NULL */
- );
-
-
-/*********************************************************************************************
- *
- * Special Purpose Calls:
- * DNSServiceCreateConnection(), DNSServiceRegisterRecord(), DNSServiceReconfirmRecord()
- * (most applications will not use these)
- *
- *********************************************************************************************/
-
-/* DNSServiceCreateConnection()
- *
- * Create a connection to the daemon allowing efficient registration of
- * multiple individual records.
- *
- * Parameters:
- *
- * sdRef: A pointer to an uninitialized DNSServiceRef. Deallocating
- * the reference (via DNSServiceRefDeallocate()) severs the
- * connection and deregisters all records registered on this connection.
- *
- * return value: Returns kDNSServiceErr_NoError on success, otherwise returns
- * an error code indicating the specific failure that occurred (in which
- * case the DNSServiceRef is not initialized).
- */
-
-DNSServiceErrorType DNSSD_API DNSServiceCreateConnection(DNSServiceRef *sdRef);
-
-
-/* DNSServiceRegisterRecord
- *
- * Register an individual resource record on a connected DNSServiceRef.
- *
- * Note that name conflicts occurring for records registered via this call must be handled
- * by the client in the callback.
- *
- * DNSServiceRegisterRecordReply() parameters:
- *
- * sdRef: The connected DNSServiceRef initialized by
- * DNSServiceCreateConnection().
- *
- * RecordRef: The DNSRecordRef initialized by DNSServiceRegisterRecord(). If the above
- * DNSServiceRef is passed to DNSServiceRefDeallocate(), this DNSRecordRef is
- * invalidated, and may not be used further.
- *
- * flags: Currently unused, reserved for future use.
- *
- * errorCode: Will be kDNSServiceErr_NoError on success, otherwise will
- * indicate the failure that occurred (including name conflicts.)
- * Other parameters are undefined if errorCode is nonzero.
- *
- * context: The context pointer that was passed to the callout.
- *
- */
-
- typedef void (DNSSD_API *DNSServiceRegisterRecordReply)
- (
- DNSServiceRef sdRef,
- DNSRecordRef RecordRef,
- DNSServiceFlags flags,
- DNSServiceErrorType errorCode,
- void *context
- );
-
-
-/* DNSServiceRegisterRecord() Parameters:
- *
- * sdRef: A DNSServiceRef initialized by DNSServiceCreateConnection().
- *
- * RecordRef: A pointer to an uninitialized DNSRecordRef. Upon succesfull completion of this
- * call, this ref may be passed to DNSServiceUpdateRecord() or DNSServiceRemoveRecord().
- * (To deregister ALL records registered on a single connected DNSServiceRef
- * and deallocate each of their corresponding DNSServiceRecordRefs, call
- * DNSServiceRefDeallocate()).
- *
- * flags: Possible values are kDNSServiceFlagsShared or kDNSServiceFlagsUnique
- * (see flag type definitions for details).
- *
- * interfaceIndex: If non-zero, specifies the interface on which to register the record
- * (the index for a given interface is determined via the if_nametoindex()
- * family of calls.) Passing 0 causes the record to be registered on all interfaces.
- * See "Constants for specifying an interface index" for more details.
- *
- * fullname: The full domain name of the resource record.
- *
- * rrtype: The numerical type of the resource record (e.g. kDNSServiceType_PTR, kDNSServiceType_SRV, etc)
- *
- * rrclass: The class of the resource record (usually kDNSServiceClass_IN)
- *
- * rdlen: Length, in bytes, of the rdata.
- *
- * rdata: A pointer to the raw rdata, as it is to appear in the DNS record.
- *
- * ttl: The time to live of the resource record, in seconds.
- * Most clients should pass 0 to indicate that the system should
- * select a sensible default value.
- *
- * callBack: The function to be called when a result is found, or if the call
- * asynchronously fails (e.g. because of a name conflict.)
- *
- * context: An application context pointer which is passed to the callback function
- * (may be NULL).
- *
- * return value: Returns kDNSServiceErr_NoError on success (any subsequent, asynchronous
- * errors are delivered to the callback), otherwise returns an error code indicating
- * the error that occurred (the callback is never invoked and the DNSRecordRef is
- * not initialized).
- */
-
-DNSServiceErrorType DNSSD_API DNSServiceRegisterRecord
- (
- DNSServiceRef sdRef,
- DNSRecordRef *RecordRef,
- DNSServiceFlags flags,
- uint32_t interfaceIndex,
- const char *fullname,
- uint16_t rrtype,
- uint16_t rrclass,
- uint16_t rdlen,
- const void *rdata,
- uint32_t ttl,
- DNSServiceRegisterRecordReply callBack,
- void *context /* may be NULL */
- );
-
-
-/* DNSServiceReconfirmRecord
- *
- * Instruct the daemon to verify the validity of a resource record that appears
- * to be out of date (e.g. because TCP connection to a service's target failed.)
- * Causes the record to be flushed from the daemon's cache (as well as all other
- * daemons' caches on the network) if the record is determined to be invalid.
- * Use this routine conservatively. Reconfirming a record necessarily consumes
- * network bandwidth, so this should not be done indiscriminately.
- *
- * Parameters:
- *
- * flags: Pass kDNSServiceFlagsForce to force immediate deletion of record,
- * instead of after some number of reconfirmation queries have gone unanswered.
- *
- * interfaceIndex: Specifies the interface of the record in question.
- * The caller must specify the interface.
- * This API (by design) causes increased network traffic, so it requires
- * the caller to be precise about which record should be reconfirmed.
- * It is not possible to pass zero for the interface index to perform
- * a "wildcard" reconfirmation, where *all* matching records are reconfirmed.
- *
- * fullname: The resource record's full domain name.
- *
- * rrtype: The resource record's type (e.g. kDNSServiceType_PTR, kDNSServiceType_SRV, etc)
- *
- * rrclass: The class of the resource record (usually kDNSServiceClass_IN).
- *
- * rdlen: The length, in bytes, of the resource record rdata.
- *
- * rdata: The raw rdata of the resource record.
- *
- */
-
-DNSServiceErrorType DNSSD_API DNSServiceReconfirmRecord
- (
- DNSServiceFlags flags,
- uint32_t interfaceIndex,
- const char *fullname,
- uint16_t rrtype,
- uint16_t rrclass,
- uint16_t rdlen,
- const void *rdata
- );
-
-
-/*********************************************************************************************
- *
- * NAT Port Mapping
- *
- *********************************************************************************************/
-
-/* DNSServiceNATPortMappingCreate
- *
- * Request a port mapping in the NAT gateway, which maps a port on the local machine
- * to an external port on the NAT. The NAT should support either the NAT-PMP or the UPnP IGD
- * protocol for this API to create a successful mapping.
- *
- * The port mapping will be renewed indefinitely until the client process exits, or
- * explicitly terminates the port mapping request by calling DNSServiceRefDeallocate().
- * The client callback will be invoked, informing the client of the NAT gateway's
- * external IP address and the external port that has been allocated for this client.
- * The client should then record this external IP address and port using whatever
- * directory service mechanism it is using to enable peers to connect to it.
- * (Clients advertising services using Wide-Area DNS-SD DO NOT need to use this API
- * -- when a client calls DNSServiceRegister() NAT mappings are automatically created
- * and the external IP address and port for the service are recorded in the global DNS.
- * Only clients using some directory mechanism other than Wide-Area DNS-SD need to use
- * this API to explicitly map their own ports.)
- *
- * It's possible that the client callback could be called multiple times, for example
- * if the NAT gateway's IP address changes, or if a configuration change results in a
- * different external port being mapped for this client. Over the lifetime of any long-lived
- * port mapping, the client should be prepared to handle these notifications of changes
- * in the environment, and should update its recorded address and/or port as appropriate.
- *
- * NOTE: There are two unusual aspects of how the DNSServiceNATPortMappingCreate API works,
- * which were intentionally designed to help simplify client code:
- *
- * 1. It's not an error to request a NAT mapping when the machine is not behind a NAT gateway.
- * In other NAT mapping APIs, if you request a NAT mapping and the machine is not behind a NAT
- * gateway, then the API returns an error code -- it can't get you a NAT mapping if there's no
- * NAT gateway. The DNSServiceNATPortMappingCreate API takes a different view. Working out
- * whether or not you need a NAT mapping can be tricky and non-obvious, particularly on
- * a machine with multiple active network interfaces. Rather than make every client recreate
- * this logic for deciding whether a NAT mapping is required, the PortMapping API does that
- * work for you. If the client calls the PortMapping API when the machine already has a
- * routable public IP address, then instead of complaining about it and giving an error,
- * the PortMapping API just invokes your callback, giving the machine's public address
- * and your own port number. This means you don't need to write code to work out whether
- * your client needs to call the PortMapping API -- just call it anyway, and if it wasn't
- * necessary, no harm is done:
- *
- * - If the machine already has a routable public IP address, then your callback
- * will just be invoked giving your own address and port.
- * - If a NAT mapping is required and obtained, then your callback will be invoked
- * giving you the external address and port.
- * - If a NAT mapping is required but not obtained from the local NAT gateway,
- * or the machine has no network connectivity, then your callback will be
- * invoked giving zero address and port.
- *
- * 2. In other NAT mapping APIs, if a laptop computer is put to sleep and woken up on a new
- * network, it's the client's job to notice this, and work out whether a NAT mapping
- * is required on the new network, and make a new NAT mapping request if necessary.
- * The DNSServiceNATPortMappingCreate API does this for you, automatically.
- * The client just needs to make one call to the PortMapping API, and its callback will
- * be invoked any time the mapping state changes. This property complements point (1) above.
- * If the client didn't make a NAT mapping request just because it determined that one was
- * not required at that particular moment in time, the client would then have to monitor
- * for network state changes to determine if a NAT port mapping later became necessary.
- * By unconditionally making a NAT mapping request, even when a NAT mapping not to be
- * necessary, the PortMapping API will then begin monitoring network state changes on behalf of
- * the client, and if a NAT mapping later becomes necessary, it will automatically create a NAT
- * mapping and inform the client with a new callback giving the new address and port information.
- *
- * DNSServiceNATPortMappingReply() parameters:
- *
- * sdRef: The DNSServiceRef initialized by DNSServiceNATPortMappingCreate().
- *
- * flags: Currently unused, reserved for future use.
- *
- * interfaceIndex: The interface through which the NAT gateway is reached.
- *
- * errorCode: Will be kDNSServiceErr_NoError on success.
- * Will be kDNSServiceErr_DoubleNAT when the NAT gateway is itself behind one or
- * more layers of NAT, in which case the other parameters have the defined values.
- * For other failures, will indicate the failure that occurred, and the other
- * parameters are undefined.
- *
- * externalAddress: Four byte IPv4 address in network byte order.
- *
- * protocol: Will be kDNSServiceProtocol_UDP or kDNSServiceProtocol_TCP or both.
- *
- * internalPort: The port on the local machine that was mapped.
- *
- * externalPort: The actual external port in the NAT gateway that was mapped.
- * This is likely to be different than the requested external port.
- *
- * ttl: The lifetime of the NAT port mapping created on the gateway.
- * This controls how quickly stale mappings will be garbage-collected
- * if the client machine crashes, suffers a power failure, is disconnected
- * from the network, or suffers some other unfortunate demise which
- * causes it to vanish without explicitly removing its NAT port mapping.
- * It's possible that the ttl value will differ from the requested ttl value.
- *
- * context: The context pointer that was passed to the callout.
- *
- */
-
-typedef void (DNSSD_API *DNSServiceNATPortMappingReply)
- (
- DNSServiceRef sdRef,
- DNSServiceFlags flags,
- uint32_t interfaceIndex,
- DNSServiceErrorType errorCode,
- uint32_t externalAddress, /* four byte IPv4 address in network byte order */
- DNSServiceProtocol protocol,
- uint16_t internalPort, /* In network byte order */
- uint16_t externalPort, /* In network byte order and may be different than the requested port */
- uint32_t ttl, /* may be different than the requested ttl */
- void *context
- );
-
-
-/* DNSServiceNATPortMappingCreate() Parameters:
- *
- * sdRef: A pointer to an uninitialized DNSServiceRef. If the call succeeds then it
- * initializes the DNSServiceRef, returns kDNSServiceErr_NoError, and the nat
- * port mapping will last indefinitely until the client terminates the port
- * mapping request by passing this DNSServiceRef to DNSServiceRefDeallocate().
- *
- * flags: Currently ignored, reserved for future use.
- *
- * interfaceIndex: The interface on which to create port mappings in a NAT gateway. Passing 0 causes
- * the port mapping request to be sent on the primary interface.
- *
- * protocol: To request a port mapping, pass in kDNSServiceProtocol_UDP, or kDNSServiceProtocol_TCP,
- * or (kDNSServiceProtocol_UDP | kDNSServiceProtocol_TCP) to map both.
- * The local listening port number must also be specified in the internalPort parameter.
- * To just discover the NAT gateway's external IP address, pass zero for protocol,
- * internalPort, externalPort and ttl.
- *
- * internalPort: The port number in network byte order on the local machine which is listening for packets.
- *
- * externalPort: The requested external port in network byte order in the NAT gateway that you would
- * like to map to the internal port. Pass 0 if you don't care which external port is chosen for you.
- *
- * ttl: The requested renewal period of the NAT port mapping, in seconds.
- * If the client machine crashes, suffers a power failure, is disconnected from
- * the network, or suffers some other unfortunate demise which causes it to vanish
- * unexpectedly without explicitly removing its NAT port mappings, then the NAT gateway
- * will garbage-collect old stale NAT port mappings when their lifetime expires.
- * Requesting a short TTL causes such orphaned mappings to be garbage-collected
- * more promptly, but consumes system resources and network bandwidth with
- * frequent renewal packets to keep the mapping from expiring.
- * Requesting a long TTL is more efficient on the network, but in the event of the
- * client vanishing, stale NAT port mappings will not be garbage-collected as quickly.
- * Most clients should pass 0 to use a system-wide default value.
- *
- * callBack: The function to be called when the port mapping request succeeds or fails asynchronously.
- *
- * context: An application context pointer which is passed to the callback function
- * (may be NULL).
- *
- * return value: Returns kDNSServiceErr_NoError on success (any subsequent, asynchronous
- * errors are delivered to the callback), otherwise returns an error code indicating
- * the error that occurred.
- *
- * If you don't actually want a port mapped, and are just calling the API
- * because you want to find out the NAT's external IP address (e.g. for UI
- * display) then pass zero for protocol, internalPort, externalPort and ttl.
- */
-
-DNSServiceErrorType DNSSD_API DNSServiceNATPortMappingCreate
- (
- DNSServiceRef *sdRef,
- DNSServiceFlags flags,
- uint32_t interfaceIndex,
- DNSServiceProtocol protocol, /* TCP and/or UDP */
- uint16_t internalPort, /* network byte order */
- uint16_t externalPort, /* network byte order */
- uint32_t ttl, /* time to live in seconds */
- DNSServiceNATPortMappingReply callBack,
- void *context /* may be NULL */
- );
-
-
-/*********************************************************************************************
- *
- * General Utility Functions
- *
- *********************************************************************************************/
-
-/* DNSServiceConstructFullName()
- *
- * Concatenate a three-part domain name (as returned by the above callbacks) into a
- * properly-escaped full domain name. Note that callbacks in the above functions ALREADY ESCAPE
- * strings where necessary.
- *
- * Parameters:
- *
- * fullName: A pointer to a buffer that where the resulting full domain name is to be written.
- * The buffer must be kDNSServiceMaxDomainName (1009) bytes in length to
- * accommodate the longest legal domain name without buffer overrun.
- *
- * service: The service name - any dots or backslashes must NOT be escaped.
- * May be NULL (to construct a PTR record name, e.g.
- * "_ftp._tcp.apple.com.").
- *
- * regtype: The service type followed by the protocol, separated by a dot
- * (e.g. "_ftp._tcp").
- *
- * domain: The domain name, e.g. "apple.com.". Literal dots or backslashes,
- * if any, must be escaped, e.g. "1st\. Floor.apple.com."
- *
- * return value: Returns kDNSServiceErr_NoError (0) on success, kDNSServiceErr_BadParam on error.
- *
- */
-
-DNSServiceErrorType DNSSD_API DNSServiceConstructFullName
- (
- char * const fullName,
- const char * const service, /* may be NULL */
- const char * const regtype,
- const char * const domain
- );
-
-
-/*********************************************************************************************
- *
- * TXT Record Construction Functions
- *
- *********************************************************************************************/
-
-/*
- * A typical calling sequence for TXT record construction is something like:
- *
- * Client allocates storage for TXTRecord data (e.g. declare buffer on the stack)
- * TXTRecordCreate();
- * TXTRecordSetValue();
- * TXTRecordSetValue();
- * TXTRecordSetValue();
- * ...
- * DNSServiceRegister( ... TXTRecordGetLength(), TXTRecordGetBytesPtr() ... );
- * TXTRecordDeallocate();
- * Explicitly deallocate storage for TXTRecord data (if not allocated on the stack)
- */
-
-
-/* TXTRecordRef
- *
- * Opaque internal data type.
- * Note: Represents a DNS-SD TXT record.
- */
-
-typedef union _TXTRecordRef_t { char PrivateData[16]; char *ForceNaturalAlignment; } TXTRecordRef;
-
-
-/* TXTRecordCreate()
- *
- * Creates a new empty TXTRecordRef referencing the specified storage.
- *
- * If the buffer parameter is NULL, or the specified storage size is not
- * large enough to hold a key subsequently added using TXTRecordSetValue(),
- * then additional memory will be added as needed using malloc().
- *
- * On some platforms, when memory is low, malloc() may fail. In this
- * case, TXTRecordSetValue() will return kDNSServiceErr_NoMemory, and this
- * error condition will need to be handled as appropriate by the caller.
- *
- * You can avoid the need to handle this error condition if you ensure
- * that the storage you initially provide is large enough to hold all
- * the key/value pairs that are to be added to the record.
- * The caller can precompute the exact length required for all of the
- * key/value pairs to be added, or simply provide a fixed-sized buffer
- * known in advance to be large enough.
- * A no-value (key-only) key requires (1 + key length) bytes.
- * A key with empty value requires (1 + key length + 1) bytes.
- * A key with non-empty value requires (1 + key length + 1 + value length).
- * For most applications, DNS-SD TXT records are generally
- * less than 100 bytes, so in most cases a simple fixed-sized
- * 256-byte buffer will be more than sufficient.
- * Recommended size limits for DNS-SD TXT Records are discussed in
- * <http://files.dns-sd.org/draft-cheshire-dnsext-dns-sd.txt>
- *
- * Note: When passing parameters to and from these TXT record APIs,
- * the key name does not include the '=' character. The '=' character
- * is the separator between the key and value in the on-the-wire
- * packet format; it is not part of either the key or the value.
- *
- * txtRecord: A pointer to an uninitialized TXTRecordRef.
- *
- * bufferLen: The size of the storage provided in the "buffer" parameter.
- *
- * buffer: Optional caller-supplied storage used to hold the TXTRecord data.
- * This storage must remain valid for as long as
- * the TXTRecordRef.
- */
-
-void DNSSD_API TXTRecordCreate
- (
- TXTRecordRef *txtRecord,
- uint16_t bufferLen,
- void *buffer
- );
-
-
-/* TXTRecordDeallocate()
- *
- * Releases any resources allocated in the course of preparing a TXT Record
- * using TXTRecordCreate()/TXTRecordSetValue()/TXTRecordRemoveValue().
- * Ownership of the buffer provided in TXTRecordCreate() returns to the client.
- *
- * txtRecord: A TXTRecordRef initialized by calling TXTRecordCreate().
- *
- */
-
-void DNSSD_API TXTRecordDeallocate
- (
- TXTRecordRef *txtRecord
- );
-
-
-/* TXTRecordSetValue()
- *
- * Adds a key (optionally with value) to a TXTRecordRef. If the "key" already
- * exists in the TXTRecordRef, then the current value will be replaced with
- * the new value.
- * Keys may exist in four states with respect to a given TXT record:
- * - Absent (key does not appear at all)
- * - Present with no value ("key" appears alone)
- * - Present with empty value ("key=" appears in TXT record)
- * - Present with non-empty value ("key=value" appears in TXT record)
- * For more details refer to "Data Syntax for DNS-SD TXT Records" in
- * <http://files.dns-sd.org/draft-cheshire-dnsext-dns-sd.txt>
- *
- * txtRecord: A TXTRecordRef initialized by calling TXTRecordCreate().
- *
- * key: A null-terminated string which only contains printable ASCII
- * values (0x20-0x7E), excluding '=' (0x3D). Keys should be
- * 9 characters or fewer (not counting the terminating null).
- *
- * valueSize: The size of the value.
- *
- * value: Any binary value. For values that represent
- * textual data, UTF-8 is STRONGLY recommended.
- * For values that represent textual data, valueSize
- * should NOT include the terminating null (if any)
- * at the end of the string.
- * If NULL, then "key" will be added with no value.
- * If non-NULL but valueSize is zero, then "key=" will be
- * added with empty value.
- *
- * return value: Returns kDNSServiceErr_NoError on success.
- * Returns kDNSServiceErr_Invalid if the "key" string contains
- * illegal characters.
- * Returns kDNSServiceErr_NoMemory if adding this key would
- * exceed the available storage.
- */
-
-DNSServiceErrorType DNSSD_API TXTRecordSetValue
- (
- TXTRecordRef *txtRecord,
- const char *key,
- uint8_t valueSize, /* may be zero */
- const void *value /* may be NULL */
- );
-
-
-/* TXTRecordRemoveValue()
- *
- * Removes a key from a TXTRecordRef. The "key" must be an
- * ASCII string which exists in the TXTRecordRef.
- *
- * txtRecord: A TXTRecordRef initialized by calling TXTRecordCreate().
- *
- * key: A key name which exists in the TXTRecordRef.
- *
- * return value: Returns kDNSServiceErr_NoError on success.
- * Returns kDNSServiceErr_NoSuchKey if the "key" does not
- * exist in the TXTRecordRef.
- */
-
-DNSServiceErrorType DNSSD_API TXTRecordRemoveValue
- (
- TXTRecordRef *txtRecord,
- const char *key
- );
-
-
-/* TXTRecordGetLength()
- *
- * Allows you to determine the length of the raw bytes within a TXTRecordRef.
- *
- * txtRecord: A TXTRecordRef initialized by calling TXTRecordCreate().
- *
- * return value: Returns the size of the raw bytes inside a TXTRecordRef
- * which you can pass directly to DNSServiceRegister() or
- * to DNSServiceUpdateRecord().
- * Returns 0 if the TXTRecordRef is empty.
- */
-
-uint16_t DNSSD_API TXTRecordGetLength
- (
- const TXTRecordRef *txtRecord
- );
-
-
-/* TXTRecordGetBytesPtr()
- *
- * Allows you to retrieve a pointer to the raw bytes within a TXTRecordRef.
- *
- * txtRecord: A TXTRecordRef initialized by calling TXTRecordCreate().
- *
- * return value: Returns a pointer to the raw bytes inside the TXTRecordRef
- * which you can pass directly to DNSServiceRegister() or
- * to DNSServiceUpdateRecord().
- */
-
-const void * DNSSD_API TXTRecordGetBytesPtr
- (
- const TXTRecordRef *txtRecord
- );
-
-
-/*********************************************************************************************
- *
- * TXT Record Parsing Functions
- *
- *********************************************************************************************/
-
-/*
- * A typical calling sequence for TXT record parsing is something like:
- *
- * Receive TXT record data in DNSServiceResolve() callback
- * if (TXTRecordContainsKey(txtLen, txtRecord, "key")) then do something
- * val1ptr = TXTRecordGetValuePtr(txtLen, txtRecord, "key1", &len1);
- * val2ptr = TXTRecordGetValuePtr(txtLen, txtRecord, "key2", &len2);
- * ...
- * memcpy(myval1, val1ptr, len1);
- * memcpy(myval2, val2ptr, len2);
- * ...
- * return;
- *
- * If you wish to retain the values after return from the DNSServiceResolve()
- * callback, then you need to copy the data to your own storage using memcpy()
- * or similar, as shown in the example above.
- *
- * If for some reason you need to parse a TXT record you built yourself
- * using the TXT record construction functions above, then you can do
- * that using TXTRecordGetLength and TXTRecordGetBytesPtr calls:
- * TXTRecordGetValue(TXTRecordGetLength(x), TXTRecordGetBytesPtr(x), key, &len);
- *
- * Most applications only fetch keys they know about from a TXT record and
- * ignore the rest.
- * However, some debugging tools wish to fetch and display all keys.
- * To do that, use the TXTRecordGetCount() and TXTRecordGetItemAtIndex() calls.
- */
-
-/* TXTRecordContainsKey()
- *
- * Allows you to determine if a given TXT Record contains a specified key.
- *
- * txtLen: The size of the received TXT Record.
- *
- * txtRecord: Pointer to the received TXT Record bytes.
- *
- * key: A null-terminated ASCII string containing the key name.
- *
- * return value: Returns 1 if the TXT Record contains the specified key.
- * Otherwise, it returns 0.
- */
-
-int DNSSD_API TXTRecordContainsKey
- (
- uint16_t txtLen,
- const void *txtRecord,
- const char *key
- );
-
-
-/* TXTRecordGetValuePtr()
- *
- * Allows you to retrieve the value for a given key from a TXT Record.
- *
- * txtLen: The size of the received TXT Record
- *
- * txtRecord: Pointer to the received TXT Record bytes.
- *
- * key: A null-terminated ASCII string containing the key name.
- *
- * valueLen: On output, will be set to the size of the "value" data.
- *
- * return value: Returns NULL if the key does not exist in this TXT record,
- * or exists with no value (to differentiate between
- * these two cases use TXTRecordContainsKey()).
- * Returns pointer to location within TXT Record bytes
- * if the key exists with empty or non-empty value.
- * For empty value, valueLen will be zero.
- * For non-empty value, valueLen will be length of value data.
- */
-
-const void * DNSSD_API TXTRecordGetValuePtr
- (
- uint16_t txtLen,
- const void *txtRecord,
- const char *key,
- uint8_t *valueLen
- );
-
-
-/* TXTRecordGetCount()
- *
- * Returns the number of keys stored in the TXT Record. The count
- * can be used with TXTRecordGetItemAtIndex() to iterate through the keys.
- *
- * txtLen: The size of the received TXT Record.
- *
- * txtRecord: Pointer to the received TXT Record bytes.
- *
- * return value: Returns the total number of keys in the TXT Record.
- *
- */
-
-uint16_t DNSSD_API TXTRecordGetCount
- (
- uint16_t txtLen,
- const void *txtRecord
- );
-
-
-/* TXTRecordGetItemAtIndex()
- *
- * Allows you to retrieve a key name and value pointer, given an index into
- * a TXT Record. Legal index values range from zero to TXTRecordGetCount()-1.
- * It's also possible to iterate through keys in a TXT record by simply
- * calling TXTRecordGetItemAtIndex() repeatedly, beginning with index zero
- * and increasing until TXTRecordGetItemAtIndex() returns kDNSServiceErr_Invalid.
- *
- * On return:
- * For keys with no value, *value is set to NULL and *valueLen is zero.
- * For keys with empty value, *value is non-NULL and *valueLen is zero.
- * For keys with non-empty value, *value is non-NULL and *valueLen is non-zero.
- *
- * txtLen: The size of the received TXT Record.
- *
- * txtRecord: Pointer to the received TXT Record bytes.
- *
- * itemIndex: An index into the TXT Record.
- *
- * keyBufLen: The size of the string buffer being supplied.
- *
- * key: A string buffer used to store the key name.
- * On return, the buffer contains a null-terminated C string
- * giving the key name. DNS-SD TXT keys are usually
- * 9 characters or fewer. To hold the maximum possible
- * key name, the buffer should be 256 bytes long.
- *
- * valueLen: On output, will be set to the size of the "value" data.
- *
- * value: On output, *value is set to point to location within TXT
- * Record bytes that holds the value data.
- *
- * return value: Returns kDNSServiceErr_NoError on success.
- * Returns kDNSServiceErr_NoMemory if keyBufLen is too short.
- * Returns kDNSServiceErr_Invalid if index is greater than
- * TXTRecordGetCount()-1.
- */
-
-DNSServiceErrorType DNSSD_API TXTRecordGetItemAtIndex
- (
- uint16_t txtLen,
- const void *txtRecord,
- uint16_t itemIndex,
- uint16_t keyBufLen,
- char *key,
- uint8_t *valueLen,
- const void **value
- );
-
-#if _DNS_SD_LIBDISPATCH
-/*
-* DNSServiceSetDispatchQueue
-*
-* Allows you to schedule a DNSServiceRef on a serial dispatch queue for receiving asynchronous
-* callbacks. It's the clients responsibility to ensure that the provided dispatch queue is running.
-*
-* A typical application that uses CFRunLoopRun or dispatch_main on its main thread will
-* usually schedule DNSServiceRefs on its main queue (which is always a serial queue)
-* using "DNSServiceSetDispatchQueue(sdref, dispatch_get_main_queue());"
-*
-* If there is any error during the processing of events, the application callback will
-* be called with an error code. For shared connections, each subordinate DNSServiceRef
-* will get its own error callback. Currently these error callbacks only happen
-* if the mDNSResponder daemon is manually terminated or crashes, and the error
-* code in this case is kDNSServiceErr_ServiceNotRunning. The application must call
-* DNSServiceRefDeallocate to free the DNSServiceRef when it gets such an error code.
-* These error callbacks are rare and should not normally happen on customer machines,
-* but application code should be written defensively to handle such error callbacks
-* gracefully if they occur.
-*
-* After using DNSServiceSetDispatchQueue on a DNSServiceRef, calling DNSServiceProcessResult
-* on the same DNSServiceRef will result in undefined behavior and should be avoided.
-*
-* Once the application successfully schedules a DNSServiceRef on a serial dispatch queue using
-* DNSServiceSetDispatchQueue, it cannot remove the DNSServiceRef from the dispatch queue, or use
-* DNSServiceSetDispatchQueue a second time to schedule the DNSServiceRef onto a different serial dispatch
-* queue. Once scheduled onto a dispatch queue a DNSServiceRef will deliver events to that queue until
-* the application no longer requires that operation and terminates it using DNSServiceRefDeallocate.
-*
-* service: DNSServiceRef that was allocated and returned to the application, when the
-* application calls one of the DNSService API.
-*
-* queue: dispatch queue where the application callback will be scheduled
-*
-* return value: Returns kDNSServiceErr_NoError on success.
-* Returns kDNSServiceErr_NoMemory if it cannot create a dispatch source
-* Returns kDNSServiceErr_BadParam if the service param is invalid or the
-* queue param is invalid
-*/
-
-DNSServiceErrorType DNSSD_API DNSServiceSetDispatchQueue
- (
- DNSServiceRef service,
- dispatch_queue_t queue
- );
-#endif //_DNS_SD_LIBDISPATCH
-
-#ifdef __APPLE_API_PRIVATE
-
-#define kDNSServiceCompPrivateDNS "PrivateDNS"
-#define kDNSServiceCompMulticastDNS "MulticastDNS"
-
-#endif //__APPLE_API_PRIVATE
-
-/* Some C compiler cleverness. We can make the compiler check certain things for us,
- * and report errors at compile-time if anything is wrong. The usual way to do this would
- * be to use a run-time "if" statement or the conventional run-time "assert" mechanism, but
- * then you don't find out what's wrong until you run the software. This way, if the assertion
- * condition is false, the array size is negative, and the complier complains immediately.
- */
-
-struct CompileTimeAssertionChecks_DNS_SD
- {
- char assert0[(sizeof(union _TXTRecordRef_t) == 16) ? 1 : -1];
- };
-
-#ifdef __cplusplus
- }
-#endif
-
-#endif /* _DNS_SD_H */
diff --git a/src/tools/mdnssd/dnssd_ipc.c b/src/tools/mdnssd/dnssd_ipc.c
deleted file mode 100644
index 131510c80e4..00000000000
--- a/src/tools/mdnssd/dnssd_ipc.c
+++ /dev/null
@@ -1,161 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2003-2004, Apple Computer, Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of its
- * contributors may be used to endorse or promote products derived from this
- * software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "dnssd_ipc.h"
-
-#if defined(_WIN32)
-
-char *win32_strerror(int inErrorCode)
- {
- static char buffer[1024];
- DWORD n;
- memset(buffer, 0, sizeof(buffer));
- n = FormatMessageA(
- FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
- NULL,
- (DWORD) inErrorCode,
- MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
- buffer,
- sizeof(buffer),
- NULL);
- if (n > 0)
- {
- // Remove any trailing CR's or LF's since some messages have them.
- while ((n > 0) && isspace(((unsigned char *) buffer)[n - 1]))
- buffer[--n] = '\0';
- }
- return buffer;
- }
-
-#endif
-
-void put_uint32(const uint32_t l, char **ptr)
- {
- (*ptr)[0] = (char)((l >> 24) & 0xFF);
- (*ptr)[1] = (char)((l >> 16) & 0xFF);
- (*ptr)[2] = (char)((l >> 8) & 0xFF);
- (*ptr)[3] = (char)((l ) & 0xFF);
- *ptr += sizeof(uint32_t);
- }
-
-uint32_t get_uint32(const char **ptr, const char *end)
- {
- if (!*ptr || *ptr + sizeof(uint32_t) > end)
- {
- *ptr = NULL;
- return(0);
- }
- else
- {
- uint8_t *p = (uint8_t*) *ptr;
- *ptr += sizeof(uint32_t);
- return((uint32_t) ((uint32_t)p[0] << 24 | (uint32_t)p[1] << 16 | (uint32_t)p[2] << 8 | p[3]));
- }
- }
-
-void put_uint16(uint16_t s, char **ptr)
- {
- (*ptr)[0] = (char)((s >> 8) & 0xFF);
- (*ptr)[1] = (char)((s ) & 0xFF);
- *ptr += sizeof(uint16_t);
- }
-
-uint16_t get_uint16(const char **ptr, const char *end)
- {
- if (!*ptr || *ptr + sizeof(uint16_t) > end)
- {
- *ptr = NULL;
- return(0);
- }
- else
- {
- uint8_t *p = (uint8_t*) *ptr;
- *ptr += sizeof(uint16_t);
- return((uint16_t) ((uint16_t)p[0] << 8 | p[1]));
- }
- }
-
-int put_string(const char *str, char **ptr)
- {
- if (!str) str = "";
- strcpy(*ptr, str);
- *ptr += strlen(str) + 1;
- return 0;
- }
-
-int get_string(const char **ptr, const char *const end, char *buffer, int buflen)
- {
- if (!*ptr)
- {
- *buffer = 0;
- return(-1);
- }
- else
- {
- char *lim = buffer + buflen; // Calculate limit
- while (*ptr < end && buffer < lim)
- {
- char c = *buffer++ = *(*ptr)++;
- if (c == 0) return(0); // Success
- }
- if (buffer == lim) buffer--;
- *buffer = 0; // Failed, so terminate string,
- *ptr = NULL; // clear pointer,
- return(-1); // and return failure indication
- }
- }
-
-void put_rdata(const int rdlen, const unsigned char *rdata, char **ptr)
- {
- memcpy(*ptr, rdata, rdlen);
- *ptr += rdlen;
- }
-
-const char *get_rdata(const char **ptr, const char *end, int rdlen)
- {
- if (!*ptr || *ptr + rdlen > end)
- {
- *ptr = NULL;
- return(0);
- }
- else
- {
- const char *rd = *ptr;
- *ptr += rdlen;
- return rd;
- }
- }
-
-void ConvertHeaderBytes(ipc_msg_hdr *hdr)
- {
- hdr->version = htonl(hdr->version);
- hdr->datalen = htonl(hdr->datalen);
- hdr->ipc_flags = htonl(hdr->ipc_flags);
- hdr->op = htonl(hdr->op );
- hdr->reg_index = htonl(hdr->reg_index);
- }
diff --git a/src/tools/mdnssd/dnssd_ipc.h b/src/tools/mdnssd/dnssd_ipc.h
deleted file mode 100644
index 748bbdf2139..00000000000
--- a/src/tools/mdnssd/dnssd_ipc.h
+++ /dev/null
@@ -1,217 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2003-2004, Apple Computer, Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of its
- * contributors may be used to endorse or promote products derived from this
- * software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef DNSSD_IPC_H
-#define DNSSD_IPC_H
-
-#include "dns_sd.h"
-
-//
-// Common cross platform services
-//
-#if defined(WIN32)
-# include <winsock2.h>
-# define dnssd_InvalidSocket INVALID_SOCKET
-# define dnssd_SocketValid(s) ((s) != INVALID_SOCKET)
-# define dnssd_EWOULDBLOCK WSAEWOULDBLOCK
-# define dnssd_EINTR WSAEINTR
-# define dnssd_ECONNRESET WSAECONNRESET
-# define dnssd_sock_t SOCKET
-# define dnssd_socklen_t int
-# define dnssd_close(sock) closesocket(sock)
-# define dnssd_errno WSAGetLastError()
-# define dnssd_strerror(X) win32_strerror(X)
-# define ssize_t int
-# define getpid _getpid
-# define unlink _unlink
-extern char *win32_strerror(int inErrorCode);
-#else
-# include <sys/types.h>
-# include <unistd.h>
-# include <sys/un.h>
-# include <string.h>
-# include <stdio.h>
-# include <stdlib.h>
-# include <sys/stat.h>
-# include <sys/socket.h>
-# include <netinet/in.h>
-# define dnssd_InvalidSocket -1
-# define dnssd_SocketValid(s) ((s) >= 0)
-# define dnssd_EWOULDBLOCK EWOULDBLOCK
-# define dnssd_EINTR EINTR
-# define dnssd_ECONNRESET ECONNRESET
-# define dnssd_EPIPE EPIPE
-# define dnssd_sock_t int
-# define dnssd_socklen_t unsigned int
-# define dnssd_close(sock) close(sock)
-# define dnssd_errno errno
-# define dnssd_strerror(X) strerror(X)
-#endif
-
-#if defined(USE_TCP_LOOPBACK)
-# define AF_DNSSD AF_INET
-# define MDNS_TCP_SERVERADDR "127.0.0.1"
-# define MDNS_TCP_SERVERPORT 5354
-# define LISTENQ 5
-# define dnssd_sockaddr_t struct sockaddr_in
-#else
-# define AF_DNSSD AF_LOCAL
-# ifndef MDNS_UDS_SERVERPATH
-# define MDNS_UDS_SERVERPATH "/var/run/mDNSResponder"
-# endif
-# define LISTENQ 100
- // longest legal control path length
-# define MAX_CTLPATH 256
-# define dnssd_sockaddr_t struct sockaddr_un
-#endif
-
-// Compatibility workaround
-#ifndef AF_LOCAL
-#define AF_LOCAL AF_UNIX
-#endif
-
-// General UDS constants
-#define TXT_RECORD_INDEX ((uint32_t)(-1)) // record index for default text record
-
-// IPC data encoding constants and types
-#define VERSION 1
-#define IPC_FLAGS_NOREPLY 1 // set flag if no asynchronous replies are to be sent to client
-
-// Structure packing macro. If we're not using GNUC, it's not fatal. Most compilers naturally pack the on-the-wire
-// structures correctly anyway, so a plain "struct" is usually fine. In the event that structures are not packed
-// correctly, our compile-time assertion checks will catch it and prevent inadvertent generation of non-working code.
-#ifndef packedstruct
- #if ((__GNUC__ > 2) || ((__GNUC__ == 2) && (__GNUC_MINOR__ >= 9)))
- #define packedstruct struct __attribute__((__packed__))
- #define packedunion union __attribute__((__packed__))
- #else
- #define packedstruct struct
- #define packedunion union
- #endif
-#endif
-
-typedef enum
- {
- request_op_none = 0, // No request yet received on this connection
- connection_request = 1, // connected socket via DNSServiceConnect()
- reg_record_request, // reg/remove record only valid for connected sockets
- remove_record_request,
- enumeration_request,
- reg_service_request,
- browse_request,
- resolve_request,
- query_request,
- reconfirm_record_request,
- add_record_request,
- update_record_request,
- setdomain_request, // Up to here is in Tiger and B4W 1.0.3
- getproperty_request, // New in B4W 1.0.4
- port_mapping_request, // New in Leopard and B4W 2.0
- addrinfo_request,
- send_bpf, // New in SL
-
- cancel_request = 63
- } request_op_t;
-
-typedef enum
- {
- enumeration_reply_op = 64,
- reg_service_reply_op,
- browse_reply_op,
- resolve_reply_op,
- query_reply_op,
- reg_record_reply_op, // Up to here is in Tiger and B4W 1.0.3
- getproperty_reply_op, // New in B4W 1.0.4
- port_mapping_reply_op, // New in Leopard and B4W 2.0
- addrinfo_reply_op
- } reply_op_t;
-
-#if defined(_WIN64)
-# pragma pack(push,4)
-#endif
-
-// Define context object big enough to hold a 64-bit pointer,
-// to accomodate 64-bit clients communicating with 32-bit daemon.
-// There's no reason for the daemon to ever be a 64-bit process, but its clients might be
-typedef packedunion
- {
- void *context;
- uint32_t u32[2];
- } client_context_t;
-
-typedef packedstruct
- {
- uint32_t version;
- uint32_t datalen;
- uint32_t ipc_flags;
- uint32_t op; // request_op_t or reply_op_t
- client_context_t client_context; // context passed from client, returned by server in corresponding reply
- uint32_t reg_index; // identifier for a record registered via DNSServiceRegisterRecord() on a
- // socket connected by DNSServiceCreateConnection(). Must be unique in the scope of the connection, such that and
- // index/socket pair uniquely identifies a record. (Used to select records for removal by DNSServiceRemoveRecord())
- } ipc_msg_hdr;
-
-#if defined(_WIN64)
-# pragma pack(pop)
-#endif
-
-// routines to write to and extract data from message buffers.
-// caller responsible for bounds checking.
-// ptr is the address of the pointer to the start of the field.
-// it is advanced to point to the next field, or the end of the message
-
-void put_uint32(const uint32_t l, char **ptr);
-uint32_t get_uint32(const char **ptr, const char *end);
-
-void put_uint16(uint16_t s, char **ptr);
-uint16_t get_uint16(const char **ptr, const char *end);
-
-#define put_flags put_uint32
-#define get_flags get_uint32
-
-#define put_error_code put_uint32
-#define get_error_code get_uint32
-
-int put_string(const char *str, char **ptr);
-int get_string(const char **ptr, const char *const end, char *buffer, int buflen);
-
-void put_rdata(const int rdlen, const unsigned char *rdata, char **ptr);
-const char *get_rdata(const char **ptr, const char *end, int rdlen); // return value is rdata pointed to by *ptr -
- // rdata is not copied from buffer.
-
-void ConvertHeaderBytes(ipc_msg_hdr *hdr);
-
-struct CompileTimeAssertionChecks_dnssd_ipc
- {
- // Check that the compiler generated our on-the-wire packet format structure definitions
- // properly packed, without adding padding bytes to align fields on 32-bit or 64-bit boundaries.
- char assert0[(sizeof(client_context_t) == 8) ? 1 : -1];
- char assert1[(sizeof(ipc_msg_hdr) == 28) ? 1 : -1];
- };
-
-#endif // DNSSD_IPC_H
diff --git a/src/tools/mdnssd/mDNS.c b/src/tools/mdnssd/mDNS.c
deleted file mode 100644
index 9de7f92c181..00000000000
--- a/src/tools/mdnssd/mDNS.c
+++ /dev/null
@@ -1,11521 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2002-2006 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * This code is completely 100% portable C. It does not depend on any external header files
- * from outside the mDNS project -- all the types it expects to find are defined right here.
- *
- * The previous point is very important: This file does not depend on any external
- * header files. It should compile on *any* platform that has a C compiler, without
- * making *any* assumptions about availability of so-called "standard" C functions,
- * routines, or types (which may or may not be present on any given platform).
-
- * Formatting notes:
- * This code follows the "Whitesmiths style" C indentation rules. Plenty of discussion
- * on C indentation can be found on the web, such as <http://www.kafejo.com/komp/1tbs.htm>,
- * but for the sake of brevity here I will say just this: Curly braces are not syntactially
- * part of an "if" statement; they are the beginning and ending markers of a compound statement;
- * therefore common sense dictates that if they are part of a compound statement then they
- * should be indented to the same level as everything else in that compound statement.
- * Indenting curly braces at the same level as the "if" implies that curly braces are
- * part of the "if", which is false. (This is as misleading as people who write "char* x,y;"
- * thinking that variables x and y are both of type "char*" -- and anyone who doesn't
- * understand why variable y is not of type "char*" just proves the point that poor code
- * layout leads people to unfortunate misunderstandings about how the C language really works.)
- */
-
-#include "DNSCommon.h" // Defines general DNS untility routines
-#include "uDNS.h" // Defines entry points into unicast-specific routines
-
-// Disable certain benign warnings with Microsoft compilers
-#if(defined(_MSC_VER))
- // Disable "conditional expression is constant" warning for debug macros.
- // Otherwise, this generates warnings for the perfectly natural construct "while(1)"
- // If someone knows a variant way of writing "while(1)" that doesn't generate warning messages, please let us know
- #pragma warning(disable:4127)
-
- // Disable "assignment within conditional expression".
- // Other compilers understand the convention that if you place the assignment expression within an extra pair
- // of parentheses, this signals to the compiler that you really intended an assignment and no warning is necessary.
- // The Microsoft compiler doesn't understand this convention, so in the absense of any other way to signal
- // to the compiler that the assignment is intentional, we have to just turn this warning off completely.
- #pragma warning(disable:4706)
-#endif
-
-#if APPLE_OSX_mDNSResponder
-
-#include <WebFilterDNS/WebFilterDNS.h>
-
-#if ! NO_WCF
-WCFConnection *WCFConnectionNew(void) __attribute__((weak_import));
-void WCFConnectionDealloc(WCFConnection* c) __attribute__((weak_import));
-
-// Do we really need to define a macro for "if"?
-#define CHECK_WCF_FUNCTION(X) if (X)
-#endif // ! NO_WCF
-
-#else
-
-#define NO_WCF 1
-#endif // APPLE_OSX_mDNSResponder
-
-// Forward declarations
-mDNSlocal void BeginSleepProcessing(mDNS *const m);
-mDNSlocal void RetrySPSRegistrations(mDNS *const m);
-mDNSlocal void SendWakeup(mDNS *const m, mDNSInterfaceID InterfaceID, mDNSEthAddr *EthAddr, mDNSOpaque48 *password);
-mDNSlocal mDNSBool CacheRecordRmvEventsForQuestion(mDNS *const m, DNSQuestion *q);
-mDNSlocal mDNSBool LocalRecordRmvEventsForQuestion(mDNS *const m, DNSQuestion *q);
-mDNSlocal void mDNS_PurgeBeforeResolve(mDNS *const m, DNSQuestion *q);
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark - Program Constants
-#endif
-
-#define NO_HINFO 1
-
-
-// Any records bigger than this are considered 'large' records
-#define SmallRecordLimit 1024
-
-#define kMaxUpdateCredits 10
-#define kUpdateCreditRefreshInterval (mDNSPlatformOneSecond * 6)
-
-mDNSexport const char *const mDNS_DomainTypeNames[] =
- {
- "b._dns-sd._udp.", // Browse
- "db._dns-sd._udp.", // Default Browse
- "lb._dns-sd._udp.", // Automatic Browse
- "r._dns-sd._udp.", // Registration
- "dr._dns-sd._udp." // Default Registration
- };
-
-#ifdef UNICAST_DISABLED
-#define uDNS_IsActiveQuery(q, u) mDNSfalse
-#endif
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - General Utility Functions
-#endif
-
-// If there is a authoritative LocalOnly record that answers questions of type A, AAAA and CNAME
-// this returns true. Main use is to handle /etc/hosts records.
-#define LORecordAnswersAddressType(rr) ((rr)->ARType == AuthRecordLocalOnly && \
- (rr)->resrec.RecordType & kDNSRecordTypeUniqueMask && \
- ((rr)->resrec.rrtype == kDNSType_A || (rr)->resrec.rrtype == kDNSType_AAAA || \
- (rr)->resrec.rrtype == kDNSType_CNAME))
-
-#define FollowCNAME(q, rr, AddRecord) (AddRecord && (q)->qtype != kDNSType_CNAME && \
- (rr)->RecordType != kDNSRecordTypePacketNegative && \
- (rr)->rrtype == kDNSType_CNAME)
-
-mDNSlocal void SetNextQueryStopTime(mDNS *const m, const DNSQuestion *const q)
- {
- if (m->mDNS_busy != m->mDNS_reentrancy+1)
- LogMsg("SetNextQueryTime: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy);
-
-#if ForceAlerts
- if (m->mDNS_busy != m->mDNS_reentrancy+1) *(long*)0 = 0;
-#endif
-
- if (m->NextScheduledStopTime - q->StopTime > 0)
- m->NextScheduledStopTime = q->StopTime;
- }
-
-mDNSexport void SetNextQueryTime(mDNS *const m, const DNSQuestion *const q)
- {
- if (m->mDNS_busy != m->mDNS_reentrancy+1)
- LogMsg("SetNextQueryTime: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy);
-
-#if ForceAlerts
- if (m->mDNS_busy != m->mDNS_reentrancy+1) *(long*)0 = 0;
-#endif
-
- if (ActiveQuestion(q))
- {
- // Depending on whether this is a multicast or unicast question we want to set either:
- // m->NextScheduledQuery = NextQSendTime(q) or
- // m->NextuDNSEvent = NextQSendTime(q)
- mDNSs32 *const timer = mDNSOpaque16IsZero(q->TargetQID) ? &m->NextScheduledQuery : &m->NextuDNSEvent;
- if (*timer - NextQSendTime(q) > 0)
- *timer = NextQSendTime(q);
- }
- }
-
-mDNSlocal void ReleaseAuthEntity(AuthHash *r, AuthEntity *e)
- {
-#if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING >= 1
- unsigned int i;
- for (i=0; i<sizeof(*e); i++) ((char*)e)[i] = 0xFF;
-#endif
- e->next = r->rrauth_free;
- r->rrauth_free = e;
- r->rrauth_totalused--;
- }
-
-mDNSlocal void ReleaseAuthGroup(AuthHash *r, AuthGroup **cp)
- {
- AuthEntity *e = (AuthEntity *)(*cp);
- LogMsg("ReleaseAuthGroup: Releasing AuthGroup %##s", (*cp)->name->c);
- if ((*cp)->rrauth_tail != &(*cp)->members)
- LogMsg("ERROR: (*cp)->members == mDNSNULL but (*cp)->rrauth_tail != &(*cp)->members)");
- if ((*cp)->name != (domainname*)((*cp)->namestorage)) mDNSPlatformMemFree((*cp)->name);
- (*cp)->name = mDNSNULL;
- *cp = (*cp)->next; // Cut record from list
- ReleaseAuthEntity(r, e);
- }
-
-mDNSlocal AuthEntity *GetAuthEntity(AuthHash *r, const AuthGroup *const PreserveAG)
- {
- AuthEntity *e = mDNSNULL;
-
- if (r->rrauth_lock) { LogMsg("GetFreeCacheRR ERROR! Cache already locked!"); return(mDNSNULL); }
- r->rrauth_lock = 1;
-
- if (!r->rrauth_free)
- {
- // We allocate just one AuthEntity at a time because we need to be able
- // free them all individually which normally happens when we parse /etc/hosts into
- // AuthHash where we add the "new" entries and discard (free) the already added
- // entries. If we allocate as chunks, we can't free them individually.
- AuthEntity *storage = mDNSPlatformMemAllocate(sizeof(AuthEntity));
- storage->next = mDNSNULL;
- r->rrauth_free = storage;
- }
-
- // If we still have no free records, recycle all the records we can.
- // Enumerating the entire auth is moderately expensive, so when we do it, we reclaim all the records we can in one pass.
- if (!r->rrauth_free)
- {
- mDNSu32 oldtotalused = r->rrauth_totalused;
- mDNSu32 slot;
- for (slot = 0; slot < AUTH_HASH_SLOTS; slot++)
- {
- AuthGroup **cp = &r->rrauth_hash[slot];
- while (*cp)
- {
- if ((*cp)->members || (*cp)==PreserveAG) cp=&(*cp)->next;
- else ReleaseAuthGroup(r, cp);
- }
- }
- LogInfo("GetAuthEntity: Recycled %d records to reduce auth cache from %d to %d",
- oldtotalused - r->rrauth_totalused, oldtotalused, r->rrauth_totalused);
- }
-
- if (r->rrauth_free) // If there are records in the free list, take one
- {
- e = r->rrauth_free;
- r->rrauth_free = e->next;
- if (++r->rrauth_totalused >= r->rrauth_report)
- {
- LogInfo("RR Auth now using %ld objects", r->rrauth_totalused);
- if (r->rrauth_report < 100) r->rrauth_report += 10;
- else if (r->rrauth_report < 1000) r->rrauth_report += 100;
- else r->rrauth_report += 1000;
- }
- mDNSPlatformMemZero(e, sizeof(*e));
- }
-
- r->rrauth_lock = 0;
-
- return(e);
- }
-
-mDNSexport AuthGroup *AuthGroupForName(AuthHash *r, const mDNSu32 slot, const mDNSu32 namehash, const domainname *const name)
- {
- AuthGroup *ag;
- for (ag = r->rrauth_hash[slot]; ag; ag=ag->next)
- if (ag->namehash == namehash && SameDomainName(ag->name, name))
- break;
- return(ag);
- }
-
-mDNSexport AuthGroup *AuthGroupForRecord(AuthHash *r, const mDNSu32 slot, const ResourceRecord *const rr)
- {
- return(AuthGroupForName(r, slot, rr->namehash, rr->name));
- }
-
-mDNSlocal AuthGroup *GetAuthGroup(AuthHash *r, const mDNSu32 slot, const ResourceRecord *const rr)
- {
- mDNSu16 namelen = DomainNameLength(rr->name);
- AuthGroup *ag = (AuthGroup*)GetAuthEntity(r, mDNSNULL);
- if (!ag) { LogMsg("GetAuthGroup: Failed to allocate memory for %##s", rr->name->c); return(mDNSNULL); }
- ag->next = r->rrauth_hash[slot];
- ag->namehash = rr->namehash;
- ag->members = mDNSNULL;
- ag->rrauth_tail = &ag->members;
- ag->name = (domainname*)ag->namestorage;
- ag->NewLocalOnlyRecords = mDNSNULL;
- if (namelen > InlineCacheGroupNameSize) ag->name = mDNSPlatformMemAllocate(namelen);
- if (!ag->name)
- {
- LogMsg("GetAuthGroup: Failed to allocate name storage for %##s", rr->name->c);
- ReleaseAuthEntity(r, (AuthEntity*)ag);
- return(mDNSNULL);
- }
- AssignDomainName(ag->name, rr->name);
-
- if (AuthGroupForRecord(r, slot, rr)) LogMsg("GetAuthGroup: Already have AuthGroup for %##s", rr->name->c);
- r->rrauth_hash[slot] = ag;
- if (AuthGroupForRecord(r, slot, rr) != ag) LogMsg("GetAuthGroup: Not finding AuthGroup for %##s", rr->name->c);
-
- return(ag);
- }
-
-// Returns the AuthGroup in which the AuthRecord was inserted
-mDNSexport AuthGroup *InsertAuthRecord(mDNS *const m, AuthHash *r, AuthRecord *rr)
- {
- AuthGroup *ag;
- const mDNSu32 slot = AuthHashSlot(rr->resrec.name);
- ag = AuthGroupForRecord(r, slot, &rr->resrec);
- if (!ag) ag = GetAuthGroup(r, slot, &rr->resrec); // If we don't have a AuthGroup for this name, make one now
- if (ag)
- {
- LogInfo("InsertAuthRecord: inserting auth record %s from table", ARDisplayString(m, rr));
- *(ag->rrauth_tail) = rr; // Append this record to tail of cache slot list
- ag->rrauth_tail = &(rr->next); // Advance tail pointer
- }
- return ag;
- }
-
-mDNSexport AuthGroup *RemoveAuthRecord(mDNS *const m, AuthHash *r, AuthRecord *rr)
- {
- AuthGroup *a;
- AuthGroup **ag = &a;
- AuthRecord **rp;
- const mDNSu32 slot = AuthHashSlot(rr->resrec.name);
-
- a = AuthGroupForRecord(r, slot, &rr->resrec);
- if (!a) { LogMsg("RemoveAuthRecord: ERROR!! AuthGroup not found for %s", ARDisplayString(m, rr)); return mDNSNULL; }
- rp = &(*ag)->members;
- while (*rp)
- {
- if (*rp != rr)
- rp=&(*rp)->next;
- else
- {
- // We don't break here, so that we can set the tail below without tracking "prev" pointers
-
- LogInfo("RemoveAuthRecord: removing auth record %s from table", ARDisplayString(m, rr));
- *rp = (*rp)->next; // Cut record from list
- }
- }
- // TBD: If there are no more members, release authgroup ?
- (*ag)->rrauth_tail = rp;
- return a;
- }
-
-mDNSexport CacheGroup *CacheGroupForName(const mDNS *const m, const mDNSu32 slot, const mDNSu32 namehash, const domainname *const name)
- {
- CacheGroup *cg;
- for (cg = m->rrcache_hash[slot]; cg; cg=cg->next)
- if (cg->namehash == namehash && SameDomainName(cg->name, name))
- break;
- return(cg);
- }
-
-mDNSlocal CacheGroup *CacheGroupForRecord(const mDNS *const m, const mDNSu32 slot, const ResourceRecord *const rr)
- {
- return(CacheGroupForName(m, slot, rr->namehash, rr->name));
- }
-
-mDNSexport mDNSBool mDNS_AddressIsLocalSubnet(mDNS *const m, const mDNSInterfaceID InterfaceID, const mDNSAddr *addr)
- {
- NetworkInterfaceInfo *intf;
-
- if (addr->type == mDNSAddrType_IPv4)
- {
- // Normally we resist touching the NotAnInteger fields, but here we're doing tricky bitwise masking so we make an exception
- if (mDNSv4AddressIsLinkLocal(&addr->ip.v4)) return(mDNStrue);
- for (intf = m->HostInterfaces; intf; intf = intf->next)
- if (intf->ip.type == addr->type && intf->InterfaceID == InterfaceID && intf->McastTxRx)
- if (((intf->ip.ip.v4.NotAnInteger ^ addr->ip.v4.NotAnInteger) & intf->mask.ip.v4.NotAnInteger) == 0)
- return(mDNStrue);
- }
-
- if (addr->type == mDNSAddrType_IPv6)
- {
- if (mDNSv6AddressIsLinkLocal(&addr->ip.v6)) return(mDNStrue);
- for (intf = m->HostInterfaces; intf; intf = intf->next)
- if (intf->ip.type == addr->type && intf->InterfaceID == InterfaceID && intf->McastTxRx)
- if ((((intf->ip.ip.v6.l[0] ^ addr->ip.v6.l[0]) & intf->mask.ip.v6.l[0]) == 0) &&
- (((intf->ip.ip.v6.l[1] ^ addr->ip.v6.l[1]) & intf->mask.ip.v6.l[1]) == 0) &&
- (((intf->ip.ip.v6.l[2] ^ addr->ip.v6.l[2]) & intf->mask.ip.v6.l[2]) == 0) &&
- (((intf->ip.ip.v6.l[3] ^ addr->ip.v6.l[3]) & intf->mask.ip.v6.l[3]) == 0))
- return(mDNStrue);
- }
-
- return(mDNSfalse);
- }
-
-mDNSlocal NetworkInterfaceInfo *FirstInterfaceForID(mDNS *const m, const mDNSInterfaceID InterfaceID)
- {
- NetworkInterfaceInfo *intf = m->HostInterfaces;
- while (intf && intf->InterfaceID != InterfaceID) intf = intf->next;
- return(intf);
- }
-
-mDNSexport char *InterfaceNameForID(mDNS *const m, const mDNSInterfaceID InterfaceID)
- {
- NetworkInterfaceInfo *intf = FirstInterfaceForID(m, InterfaceID);
- return(intf ? intf->ifname : mDNSNULL);
- }
-
-// Caller should hold the lock
-mDNSlocal void GenerateNegativeResponse(mDNS *const m)
- {
- DNSQuestion *q;
- if (!m->CurrentQuestion) { LogMsg("GenerateNegativeResponse: ERROR!! CurrentQuestion not set"); return; }
- q = m->CurrentQuestion;
- LogInfo("GenerateNegativeResponse: Generating negative response for question %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
-
- MakeNegativeCacheRecord(m, &m->rec.r, &q->qname, q->qnamehash, q->qtype, q->qclass, 60, mDNSInterface_Any, mDNSNULL);
- AnswerCurrentQuestionWithResourceRecord(m, &m->rec.r, QC_addnocache);
- if (m->CurrentQuestion == q) { q->ThisQInterval = 0; } // Deactivate this question
- // Don't touch the question after this
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
- }
-
-mDNSlocal void AnswerQuestionByFollowingCNAME(mDNS *const m, DNSQuestion *q, ResourceRecord *rr)
- {
- const mDNSBool selfref = SameDomainName(&q->qname, &rr->rdata->u.name);
- if (q->CNAMEReferrals >= 10 || selfref)
- LogMsg("AnswerQuestionByFollowingCNAME: %p %##s (%s) NOT following CNAME referral %d%s for %s",
- q, q->qname.c, DNSTypeName(q->qtype), q->CNAMEReferrals, selfref ? " (Self-Referential)" : "", RRDisplayString(m, rr));
- else
- {
- const mDNSu32 c = q->CNAMEReferrals + 1; // Stash a copy of the new q->CNAMEReferrals value
-
- // The SameDomainName check above is to ignore bogus CNAME records that point right back at
- // themselves. Without that check we can get into a case where we have two duplicate questions,
- // A and B, and when we stop question A, UpdateQuestionDuplicates copies the value of CNAMEReferrals
- // from A to B, and then A is re-appended to the end of the list as a duplicate of B (because
- // the target name is still the same), and then when we stop question B, UpdateQuestionDuplicates
- // copies the B's value of CNAMEReferrals back to A, and we end up not incrementing CNAMEReferrals
- // for either of them. This is not a problem for CNAME loops of two or more records because in
- // those cases the newly re-appended question A has a different target name and therefore cannot be
- // a duplicate of any other question ('B') which was itself a duplicate of the previous question A.
-
- // Right now we just stop and re-use the existing query. If we really wanted to be 100% perfect,
- // and track CNAMEs coming and going, we should really create a subordinate query here,
- // which we would subsequently cancel and retract if the CNAME referral record were removed.
- // In reality this is such a corner case we'll ignore it until someone actually needs it.
-
- LogInfo("AnswerQuestionByFollowingCNAME: %p %##s (%s) following CNAME referral %d for %s",
- q, q->qname.c, DNSTypeName(q->qtype), q->CNAMEReferrals, RRDisplayString(m, rr));
-
- mDNS_StopQuery_internal(m, q); // Stop old query
- AssignDomainName(&q->qname, &rr->rdata->u.name); // Update qname
- q->qnamehash = DomainNameHashValue(&q->qname); // and namehash
- // If a unicast query results in a CNAME that points to a .local, we need to re-try
- // this as unicast. Setting the mDNSInterface_Unicast tells mDNS_StartQuery_internal
- // to try this as unicast query even though it is a .local name
- if (!mDNSOpaque16IsZero(q->TargetQID) && IsLocalDomain(&q->qname))
- {
- LogInfo("AnswerQuestionByFollowingCNAME: Resolving a .local CNAME %p %##s (%s) Record %s",
- q, q->qname.c, DNSTypeName(q->qtype), RRDisplayString(m, rr));
- q->InterfaceID = mDNSInterface_Unicast;
- }
- mDNS_StartQuery_internal(m, q); // start new query
- // Record how many times we've done this. We need to do this *after* mDNS_StartQuery_internal,
- // because mDNS_StartQuery_internal re-initializes CNAMEReferrals to zero
- q->CNAMEReferrals = c;
- }
- }
-
-// For a single given DNSQuestion pointed to by CurrentQuestion, deliver an add/remove result for the single given AuthRecord
-// Note: All the callers should use the m->CurrentQuestion to see if the question is still valid or not
-mDNSlocal void AnswerLocalQuestionWithLocalAuthRecord(mDNS *const m, AuthRecord *rr, QC_result AddRecord)
- {
- DNSQuestion *q = m->CurrentQuestion;
- mDNSBool followcname;
-
- if (!q)
- {
- LogMsg("AnswerLocalQuestionWithLocalAuthRecord: ERROR!! CurrentQuestion NULL while answering with %s", ARDisplayString(m, rr));
- return;
- }
-
- followcname = FollowCNAME(q, &rr->resrec, AddRecord);
-
- // We should not be delivering results for record types Unregistered, Deregistering, and (unverified) Unique
- if (!(rr->resrec.RecordType & kDNSRecordTypeActiveMask))
- {
- LogMsg("AnswerLocalQuestionWithLocalAuthRecord: *NOT* delivering %s event for local record type %X %s",
- AddRecord ? "Add" : "Rmv", rr->resrec.RecordType, ARDisplayString(m, rr));
- return;
- }
-
- // Indicate that we've given at least one positive answer for this record, so we should be prepared to send a goodbye for it
- if (AddRecord) rr->AnsweredLocalQ = mDNStrue;
- mDNS_DropLockBeforeCallback(); // Allow client to legally make mDNS API calls from the callback
- if (q->QuestionCallback && !q->NoAnswer)
- {
- q->CurrentAnswers += AddRecord ? 1 : -1;
- if (LORecordAnswersAddressType(rr))
- {
- if (!followcname || q->ReturnIntermed)
- {
- // Don't send this packet on the wire as we answered from /etc/hosts
- q->ThisQInterval = 0;
- q->LOAddressAnswers += AddRecord ? 1 : -1;
- q->QuestionCallback(m, q, &rr->resrec, AddRecord);
- }
- mDNS_ReclaimLockAfterCallback(); // Decrement mDNS_reentrancy to block mDNS API calls again
- // The callback above could have caused the question to stop. Detect that
- // using m->CurrentQuestion
- if (followcname && m->CurrentQuestion == q)
- AnswerQuestionByFollowingCNAME(m, q, &rr->resrec);
- return;
- }
- else
- q->QuestionCallback(m, q, &rr->resrec, AddRecord);
- }
- mDNS_ReclaimLockAfterCallback(); // Decrement mDNS_reentrancy to block mDNS API calls again
- }
-
-mDNSlocal void AnswerInterfaceAnyQuestionsWithLocalAuthRecord(mDNS *const m, AuthRecord *rr, QC_result AddRecord)
- {
- if (m->CurrentQuestion)
- LogMsg("AnswerInterfaceAnyQuestionsWithLocalAuthRecord: ERROR m->CurrentQuestion already set: %##s (%s)",
- m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype));
- m->CurrentQuestion = m->Questions;
- while (m->CurrentQuestion && m->CurrentQuestion != m->NewQuestions)
- {
- mDNSBool answered;
- DNSQuestion *q = m->CurrentQuestion;
- if (RRAny(rr))
- answered = ResourceRecordAnswersQuestion(&rr->resrec, q);
- else
- answered = LocalOnlyRecordAnswersQuestion(rr, q);
- if (answered)
- AnswerLocalQuestionWithLocalAuthRecord(m, rr, AddRecord); // MUST NOT dereference q again
- if (m->CurrentQuestion == q) // If m->CurrentQuestion was not auto-advanced, do it ourselves now
- m->CurrentQuestion = q->next;
- }
- m->CurrentQuestion = mDNSNULL;
- }
-
-// When a new local AuthRecord is created or deleted, AnswerAllLocalQuestionsWithLocalAuthRecord()
-// delivers the appropriate add/remove events to listening questions:
-// 1. It runs though all our LocalOnlyQuestions delivering answers as appropriate,
-// stopping if it reaches a NewLocalOnlyQuestion -- brand-new questions are handled by AnswerNewLocalOnlyQuestion().
-// 2. If the AuthRecord is marked mDNSInterface_LocalOnly or mDNSInterface_P2P, then it also runs though
-// our main question list, delivering answers to mDNSInterface_Any questions as appropriate,
-// stopping if it reaches a NewQuestion -- brand-new questions are handled by AnswerNewQuestion().
-//
-// AnswerAllLocalQuestionsWithLocalAuthRecord is used by the m->NewLocalRecords loop in mDNS_Execute(),
-// and by mDNS_Deregister_internal()
-
-mDNSlocal void AnswerAllLocalQuestionsWithLocalAuthRecord(mDNS *const m, AuthRecord *rr, QC_result AddRecord)
- {
- if (m->CurrentQuestion)
- LogMsg("AnswerAllLocalQuestionsWithLocalAuthRecord ERROR m->CurrentQuestion already set: %##s (%s)",
- m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype));
-
- m->CurrentQuestion = m->LocalOnlyQuestions;
- while (m->CurrentQuestion && m->CurrentQuestion != m->NewLocalOnlyQuestions)
- {
- mDNSBool answered;
- DNSQuestion *q = m->CurrentQuestion;
- // We are called with both LocalOnly/P2P record or a regular AuthRecord
- if (RRAny(rr))
- answered = ResourceRecordAnswersQuestion(&rr->resrec, q);
- else
- answered = LocalOnlyRecordAnswersQuestion(rr, q);
- if (answered)
- AnswerLocalQuestionWithLocalAuthRecord(m, rr, AddRecord); // MUST NOT dereference q again
- if (m->CurrentQuestion == q) // If m->CurrentQuestion was not auto-advanced, do it ourselves now
- m->CurrentQuestion = q->next;
- }
-
- m->CurrentQuestion = mDNSNULL;
-
- // If this AuthRecord is marked LocalOnly or P2P, then we want to deliver it to all local 'mDNSInterface_Any' questions
- if (rr->ARType == AuthRecordLocalOnly || rr->ARType == AuthRecordP2P)
- AnswerInterfaceAnyQuestionsWithLocalAuthRecord(m, rr, AddRecord);
-
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - Resource Record Utility Functions
-#endif
-
-#define RRTypeIsAddressType(T) ((T) == kDNSType_A || (T) == kDNSType_AAAA)
-
-#define ResourceRecordIsValidAnswer(RR) ( ((RR)-> resrec.RecordType & kDNSRecordTypeActiveMask) && \
- ((RR)->Additional1 == mDNSNULL || ((RR)->Additional1->resrec.RecordType & kDNSRecordTypeActiveMask)) && \
- ((RR)->Additional2 == mDNSNULL || ((RR)->Additional2->resrec.RecordType & kDNSRecordTypeActiveMask)) && \
- ((RR)->DependentOn == mDNSNULL || ((RR)->DependentOn->resrec.RecordType & kDNSRecordTypeActiveMask)) )
-
-#define ResourceRecordIsValidInterfaceAnswer(RR, INTID) \
- (ResourceRecordIsValidAnswer(RR) && \
- ((RR)->resrec.InterfaceID == mDNSInterface_Any || (RR)->resrec.InterfaceID == (INTID)))
-
-#define DefaultProbeCountForTypeUnique ((mDNSu8)3)
-#define DefaultProbeCountForRecordType(X) ((X) == kDNSRecordTypeUnique ? DefaultProbeCountForTypeUnique : (mDNSu8)0)
-
-#define InitialAnnounceCount ((mDNSu8)8)
-
-// For goodbye packets we set the count to 3, and for wakeups we set it to 18
-// (which will be up to 15 wakeup attempts over the course of 30 seconds,
-// and then if the machine fails to wake, 3 goodbye packets).
-#define GoodbyeCount ((mDNSu8)3)
-#define WakeupCount ((mDNSu8)18)
-
-// Number of wakeups we send if WakeOnResolve is set in the question
-#define InitialWakeOnResolveCount ((mDNSu8)3)
-
-// Note that the announce intervals use exponential backoff, doubling each time. The probe intervals do not.
-// This means that because the announce interval is doubled after sending the first packet, the first
-// observed on-the-wire inter-packet interval between announcements is actually one second.
-// The half-second value here may be thought of as a conceptual (non-existent) half-second delay *before* the first packet is sent.
-#define DefaultProbeIntervalForTypeUnique (mDNSPlatformOneSecond/4)
-#define DefaultAnnounceIntervalForTypeShared (mDNSPlatformOneSecond/2)
-#define DefaultAnnounceIntervalForTypeUnique (mDNSPlatformOneSecond/2)
-
-#define DefaultAPIntervalForRecordType(X) ((X) & kDNSRecordTypeActiveSharedMask ? DefaultAnnounceIntervalForTypeShared : \
- (X) & kDNSRecordTypeUnique ? DefaultProbeIntervalForTypeUnique : \
- (X) & kDNSRecordTypeActiveUniqueMask ? DefaultAnnounceIntervalForTypeUnique : 0)
-
-#define TimeToAnnounceThisRecord(RR,time) ((RR)->AnnounceCount && (time) - ((RR)->LastAPTime + (RR)->ThisAPInterval) >= 0)
-#define TimeToSendThisRecord(RR,time) ((TimeToAnnounceThisRecord(RR,time) || (RR)->ImmedAnswer) && ResourceRecordIsValidAnswer(RR))
-#define TicksTTL(RR) ((mDNSs32)(RR)->resrec.rroriginalttl * mDNSPlatformOneSecond)
-#define RRExpireTime(RR) ((RR)->TimeRcvd + TicksTTL(RR))
-
-#define MaxUnansweredQueries 4
-
-// SameResourceRecordSignature returns true if two resources records have the same name, type, and class, and may be sent
-// (or were received) on the same interface (i.e. if *both* records specify an interface, then it has to match).
-// TTL and rdata may differ.
-// This is used for cache flush management:
-// When sending a unique record, all other records matching "SameResourceRecordSignature" must also be sent
-// When receiving a unique record, all old cache records matching "SameResourceRecordSignature" are flushed
-
-// SameResourceRecordNameClassInterface is functionally the same as SameResourceRecordSignature, except rrtype does not have to match
-
-#define SameResourceRecordSignature(A,B) (A)->resrec.rrtype == (B)->resrec.rrtype && SameResourceRecordNameClassInterface((A),(B))
-
-mDNSlocal mDNSBool SameResourceRecordNameClassInterface(const AuthRecord *const r1, const AuthRecord *const r2)
- {
- if (!r1) { LogMsg("SameResourceRecordSignature ERROR: r1 is NULL"); return(mDNSfalse); }
- if (!r2) { LogMsg("SameResourceRecordSignature ERROR: r2 is NULL"); return(mDNSfalse); }
- if (r1->resrec.InterfaceID &&
- r2->resrec.InterfaceID &&
- r1->resrec.InterfaceID != r2->resrec.InterfaceID) return(mDNSfalse);
- return(mDNSBool)(
- r1->resrec.rrclass == r2->resrec.rrclass &&
- r1->resrec.namehash == r2->resrec.namehash &&
- SameDomainName(r1->resrec.name, r2->resrec.name));
- }
-
-// PacketRRMatchesSignature behaves as SameResourceRecordSignature, except that types may differ if our
-// authoratative record is unique (as opposed to shared). For unique records, we are supposed to have
-// complete ownership of *all* types for this name, so *any* record type with the same name is a conflict.
-// In addition, when probing we send our questions with the wildcard type kDNSQType_ANY,
-// so a response of any type should match, even if it is not actually the type the client plans to use.
-
-// For now, to make it easier to avoid false conflicts, we treat SPS Proxy records like shared records,
-// and require the rrtypes to match for the rdata to be considered potentially conflicting
-mDNSlocal mDNSBool PacketRRMatchesSignature(const CacheRecord *const pktrr, const AuthRecord *const authrr)
- {
- if (!pktrr) { LogMsg("PacketRRMatchesSignature ERROR: pktrr is NULL"); return(mDNSfalse); }
- if (!authrr) { LogMsg("PacketRRMatchesSignature ERROR: authrr is NULL"); return(mDNSfalse); }
- if (pktrr->resrec.InterfaceID &&
- authrr->resrec.InterfaceID &&
- pktrr->resrec.InterfaceID != authrr->resrec.InterfaceID) return(mDNSfalse);
- if (!(authrr->resrec.RecordType & kDNSRecordTypeUniqueMask) || authrr->WakeUp.HMAC.l[0])
- if (pktrr->resrec.rrtype != authrr->resrec.rrtype) return(mDNSfalse);
- return(mDNSBool)(
- pktrr->resrec.rrclass == authrr->resrec.rrclass &&
- pktrr->resrec.namehash == authrr->resrec.namehash &&
- SameDomainName(pktrr->resrec.name, authrr->resrec.name));
- }
-
-// CacheRecord *ka is the CacheRecord from the known answer list in the query.
-// This is the information that the requester believes to be correct.
-// AuthRecord *rr is the answer we are proposing to give, if not suppressed.
-// This is the information that we believe to be correct.
-// We've already determined that we plan to give this answer on this interface
-// (either the record is non-specific, or it is specific to this interface)
-// so now we just need to check the name, type, class, rdata and TTL.
-mDNSlocal mDNSBool ShouldSuppressKnownAnswer(const CacheRecord *const ka, const AuthRecord *const rr)
- {
- // If RR signature is different, or data is different, then don't suppress our answer
- if (!IdenticalResourceRecord(&ka->resrec, &rr->resrec)) return(mDNSfalse);
-
- // If the requester's indicated TTL is less than half the real TTL,
- // we need to give our answer before the requester's copy expires.
- // If the requester's indicated TTL is at least half the real TTL,
- // then we can suppress our answer this time.
- // If the requester's indicated TTL is greater than the TTL we believe,
- // then that's okay, and we don't need to do anything about it.
- // (If two responders on the network are offering the same information,
- // that's okay, and if they are offering the information with different TTLs,
- // the one offering the lower TTL should defer to the one offering the higher TTL.)
- return(mDNSBool)(ka->resrec.rroriginalttl >= rr->resrec.rroriginalttl / 2);
- }
-
-mDNSlocal void SetNextAnnounceProbeTime(mDNS *const m, const AuthRecord *const rr)
- {
- if (rr->resrec.RecordType == kDNSRecordTypeUnique)
- {
- if ((rr->LastAPTime + rr->ThisAPInterval) - m->timenow > mDNSPlatformOneSecond * 10)
- {
- LogMsg("SetNextAnnounceProbeTime: ProbeCount %d Next in %d %s", rr->ProbeCount, (rr->LastAPTime + rr->ThisAPInterval) - m->timenow, ARDisplayString(m, rr));
- LogMsg("SetNextAnnounceProbeTime: m->SuppressProbes %d m->timenow %d diff %d", m->SuppressProbes, m->timenow, m->SuppressProbes - m->timenow);
- }
- if (m->NextScheduledProbe - (rr->LastAPTime + rr->ThisAPInterval) >= 0)
- m->NextScheduledProbe = (rr->LastAPTime + rr->ThisAPInterval);
- // Some defensive code:
- // If (rr->LastAPTime + rr->ThisAPInterval) happens to be far in the past, we don't want to allow
- // NextScheduledProbe to be set excessively in the past, because that can cause bad things to happen.
- // See: <rdar://problem/7795434> mDNS: Sometimes advertising stops working and record interval is set to zero
- if (m->NextScheduledProbe - m->timenow < 0)
- m->NextScheduledProbe = m->timenow;
- }
- else if (rr->AnnounceCount && (ResourceRecordIsValidAnswer(rr) || rr->resrec.RecordType == kDNSRecordTypeDeregistering))
- {
- if (m->NextScheduledResponse - (rr->LastAPTime + rr->ThisAPInterval) >= 0)
- m->NextScheduledResponse = (rr->LastAPTime + rr->ThisAPInterval);
- }
- }
-
-mDNSlocal void InitializeLastAPTime(mDNS *const m, AuthRecord *const rr)
- {
- // For reverse-mapping Sleep Proxy PTR records, probe interval is one second
- rr->ThisAPInterval = rr->AddressProxy.type ? mDNSPlatformOneSecond : DefaultAPIntervalForRecordType(rr->resrec.RecordType);
-
- // * If this is a record type that's going to probe, then we use the m->SuppressProbes time.
- // * Otherwise, if it's not going to probe, but m->SuppressProbes is set because we have other
- // records that are going to probe, then we delay its first announcement so that it will
- // go out synchronized with the first announcement for the other records that *are* probing.
- // This is a minor performance tweak that helps keep groups of related records synchronized together.
- // The addition of "interval / 2" is to make sure that, in the event that any of the probes are
- // delayed by a few milliseconds, this announcement does not inadvertently go out *before* the probing is complete.
- // When the probing is complete and those records begin to announce, these records will also be picked up and accelerated,
- // because they will meet the criterion of being at least half-way to their scheduled announcement time.
- // * If it's not going to probe and m->SuppressProbes is not already set then we should announce immediately.
-
- if (rr->ProbeCount)
- {
- // If we have no probe suppression time set, or it is in the past, set it now
- if (m->SuppressProbes == 0 || m->SuppressProbes - m->timenow < 0)
- {
- // To allow us to aggregate probes when a group of services are registered together,
- // the first probe is delayed 1/4 second. This means the common-case behaviour is:
- // 1/4 second wait; probe
- // 1/4 second wait; probe
- // 1/4 second wait; probe
- // 1/4 second wait; announce (i.e. service is normally announced exactly one second after being registered)
- m->SuppressProbes = NonZeroTime(m->timenow + DefaultProbeIntervalForTypeUnique/2 + mDNSRandom(DefaultProbeIntervalForTypeUnique/2));
-
- // If we already have a *probe* scheduled to go out sooner, then use that time to get better aggregation
- if (m->SuppressProbes - m->NextScheduledProbe >= 0)
- m->SuppressProbes = NonZeroTime(m->NextScheduledProbe);
- if (m->SuppressProbes - m->timenow < 0) // Make sure we don't set m->SuppressProbes excessively in the past
- m->SuppressProbes = m->timenow;
-
- // If we already have a *query* scheduled to go out sooner, then use that time to get better aggregation
- if (m->SuppressProbes - m->NextScheduledQuery >= 0)
- m->SuppressProbes = NonZeroTime(m->NextScheduledQuery);
- if (m->SuppressProbes - m->timenow < 0) // Make sure we don't set m->SuppressProbes excessively in the past
- m->SuppressProbes = m->timenow;
-
- // except... don't expect to be able to send before the m->SuppressSending timer fires
- if (m->SuppressSending && m->SuppressProbes - m->SuppressSending < 0)
- m->SuppressProbes = NonZeroTime(m->SuppressSending);
-
- if (m->SuppressProbes - m->timenow > mDNSPlatformOneSecond * 8)
- {
- LogMsg("InitializeLastAPTime ERROR m->SuppressProbes %d m->NextScheduledProbe %d m->NextScheduledQuery %d m->SuppressSending %d %d",
- m->SuppressProbes - m->timenow,
- m->NextScheduledProbe - m->timenow,
- m->NextScheduledQuery - m->timenow,
- m->SuppressSending,
- m->SuppressSending - m->timenow);
- m->SuppressProbes = NonZeroTime(m->timenow + DefaultProbeIntervalForTypeUnique/2 + mDNSRandom(DefaultProbeIntervalForTypeUnique/2));
- }
- }
- rr->LastAPTime = m->SuppressProbes - rr->ThisAPInterval;
- }
- else if (m->SuppressProbes && m->SuppressProbes - m->timenow >= 0)
- rr->LastAPTime = m->SuppressProbes - rr->ThisAPInterval + DefaultProbeIntervalForTypeUnique * DefaultProbeCountForTypeUnique + rr->ThisAPInterval / 2;
- else
- rr->LastAPTime = m->timenow - rr->ThisAPInterval;
-
- // For reverse-mapping Sleep Proxy PTR records we don't want to start probing instantly -- we
- // wait one second to give the client a chance to go to sleep, and then start our ARP/NDP probing.
- // After three probes one second apart with no answer, we conclude the client is now sleeping
- // and we can begin broadcasting our announcements to take over ownership of that IP address.
- // If we don't wait for the client to go to sleep, then when the client sees our ARP Announcements there's a risk
- // (depending on the OS and networking stack it's using) that it might interpret it as a conflict and change its IP address.
- if (rr->AddressProxy.type) rr->LastAPTime = m->timenow;
-
- // Unsolicited Neighbor Advertisements (RFC 2461 Section 7.2.6) give us fast address cache updating,
- // but some older IPv6 clients get confused by them, so for now we don't send them. Without Unsolicited
- // Neighbor Advertisements we have to rely on Neighbor Unreachability Detection instead, which is slower.
- // Given this, we'll do our best to wake for existing IPv6 connections, but we don't want to encourage
- // new ones for sleeping clients, so we'll we send deletions for our SPS clients' AAAA records.
- if (m->KnownBugs & mDNS_KnownBug_LimitedIPv6)
- if (rr->WakeUp.HMAC.l[0] && rr->resrec.rrtype == kDNSType_AAAA)
- rr->LastAPTime = m->timenow - rr->ThisAPInterval + mDNSPlatformOneSecond * 10;
-
- // Set LastMCTime to now, to inhibit multicast responses
- // (no need to send additional multicast responses when we're announcing anyway)
- rr->LastMCTime = m->timenow;
- rr->LastMCInterface = mDNSInterfaceMark;
-
- SetNextAnnounceProbeTime(m, rr);
- }
-
-mDNSlocal const domainname *SetUnicastTargetToHostName(mDNS *const m, AuthRecord *rr)
- {
- const domainname *target;
- if (rr->AutoTarget)
- {
- // For autotunnel services pointing at our IPv6 ULA we don't need or want a NAT mapping, but for all other
- // advertised services referencing our uDNS hostname, we want NAT mappings automatically created as appropriate,
- // with the port number in our advertised SRV record automatically tracking the external mapped port.
- DomainAuthInfo *AuthInfo = GetAuthInfoForName_internal(m, rr->resrec.name);
- if (!AuthInfo || !AuthInfo->AutoTunnel) rr->AutoTarget = Target_AutoHostAndNATMAP;
- }
-
- target = GetServiceTarget(m, rr);
- if (!target || target->c[0] == 0)
- {
- // defer registration until we've got a target
- LogInfo("SetUnicastTargetToHostName No target for %s", ARDisplayString(m, rr));
- rr->state = regState_NoTarget;
- return mDNSNULL;
- }
- else
- {
- LogInfo("SetUnicastTargetToHostName target %##s for resource record %s", target->c, ARDisplayString(m,rr));
- return target;
- }
- }
-
-// Right now this only applies to mDNS (.local) services where the target host is always m->MulticastHostname
-// Eventually we should unify this with GetServiceTarget() in uDNS.c
-mDNSlocal void SetTargetToHostName(mDNS *const m, AuthRecord *const rr)
- {
- domainname *const target = GetRRDomainNameTarget(&rr->resrec);
- const domainname *newname = &m->MulticastHostname;
-
- if (!target) LogInfo("SetTargetToHostName: Don't know how to set the target of rrtype %s", DNSTypeName(rr->resrec.rrtype));
-
- if (!(rr->ForceMCast || rr->ARType == AuthRecordLocalOnly || rr->ARType == AuthRecordP2P || IsLocalDomain(&rr->namestorage)))
- {
- const domainname *const n = SetUnicastTargetToHostName(m, rr);
- if (n) newname = n;
- else { target->c[0] = 0; SetNewRData(&rr->resrec, mDNSNULL, 0); return; }
- }
-
- if (target && SameDomainName(target, newname))
- debugf("SetTargetToHostName: Target of %##s is already %##s", rr->resrec.name->c, target->c);
-
- if (target && !SameDomainName(target, newname))
- {
- AssignDomainName(target, newname);
- SetNewRData(&rr->resrec, mDNSNULL, 0); // Update rdlength, rdestimate, rdatahash
-
- // If we're in the middle of probing this record, we need to start again,
- // because changing its rdata may change the outcome of the tie-breaker.
- // (If the record type is kDNSRecordTypeUnique (unconfirmed unique) then DefaultProbeCountForRecordType is non-zero.)
- rr->ProbeCount = DefaultProbeCountForRecordType(rr->resrec.RecordType);
-
- // If we've announced this record, we really should send a goodbye packet for the old rdata before
- // changing to the new rdata. However, in practice, we only do SetTargetToHostName for unique records,
- // so when we announce them we'll set the kDNSClass_UniqueRRSet and clear any stale data that way.
- if (rr->RequireGoodbye && rr->resrec.RecordType == kDNSRecordTypeShared)
- debugf("Have announced shared record %##s (%s) at least once: should have sent a goodbye packet before updating",
- rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype));
-
- rr->AnnounceCount = InitialAnnounceCount;
- rr->RequireGoodbye = mDNSfalse;
- InitializeLastAPTime(m, rr);
- }
- }
-
-mDNSlocal void AcknowledgeRecord(mDNS *const m, AuthRecord *const rr)
- {
- if (rr->RecordCallback)
- {
- // CAUTION: MUST NOT do anything more with rr after calling rr->Callback(), because the client's callback function
- // is allowed to do anything, including starting/stopping queries, registering/deregistering records, etc.
- rr->Acknowledged = mDNStrue;
- mDNS_DropLockBeforeCallback(); // Allow client to legally make mDNS API calls from the callback
- rr->RecordCallback(m, rr, mStatus_NoError);
- mDNS_ReclaimLockAfterCallback(); // Decrement mDNS_reentrancy to block mDNS API calls again
- }
- }
-
-mDNSexport void ActivateUnicastRegistration(mDNS *const m, AuthRecord *const rr)
- {
- // Make sure that we don't activate the SRV record and associated service records, if it is in
- // NoTarget state. First time when a service is being instantiated, SRV record may be in NoTarget state.
- // We should not activate any of the other reords (PTR, TXT) that are part of the service. When
- // the target becomes available, the records will be reregistered.
- if (rr->resrec.rrtype != kDNSType_SRV)
- {
- AuthRecord *srvRR = mDNSNULL;
- if (rr->resrec.rrtype == kDNSType_PTR)
- srvRR = rr->Additional1;
- else if (rr->resrec.rrtype == kDNSType_TXT)
- srvRR = rr->DependentOn;
- if (srvRR)
- {
- if (srvRR->resrec.rrtype != kDNSType_SRV)
- {
- LogMsg("ActivateUnicastRegistration: ERROR!! Resource record %s wrong, expecting SRV type", ARDisplayString(m, srvRR));
- }
- else
- {
- LogInfo("ActivateUnicastRegistration: Found Service Record %s in state %d for %##s (%s)",
- ARDisplayString(m, srvRR), srvRR->state, rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype));
- rr->state = srvRR->state;
- }
- }
- }
-
- if (rr->state == regState_NoTarget)
- {
- LogInfo("ActivateUnicastRegistration record %s in regState_NoTarget, not activating", ARDisplayString(m, rr));
- return;
- }
- // When we wake up from sleep, we call ActivateUnicastRegistration. It is possible that just before we went to sleep,
- // the service/record was being deregistered. In that case, we should not try to register again. For the cases where
- // the records are deregistered due to e.g., no target for the SRV record, we would have returned from above if it
- // was already in NoTarget state. If it was in the process of deregistration but did not complete fully before we went
- // to sleep, then it is okay to start in Pending state as we will go back to NoTarget state if we don't have a target.
- if (rr->resrec.RecordType == kDNSRecordTypeDeregistering)
- {
- LogInfo("ActivateUnicastRegistration: Resource record %s, current state %d, moving to DeregPending", ARDisplayString(m, rr), rr->state);
- rr->state = regState_DeregPending;
- }
- else
- {
- LogInfo("ActivateUnicastRegistration: Resource record %s, current state %d, moving to Pending", ARDisplayString(m, rr), rr->state);
- rr->state = regState_Pending;
- }
- rr->ProbeCount = 0;
- rr->AnnounceCount = 0;
- rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL;
- rr->LastAPTime = m->timenow - rr->ThisAPInterval;
- rr->expire = 0; // Forget about all the leases, start fresh
- rr->uselease = mDNStrue;
- rr->updateid = zeroID;
- rr->SRVChanged = mDNSfalse;
- rr->updateError = mStatus_NoError;
- // RestartRecordGetZoneData calls this function whenever a new interface gets registered with core.
- // The records might already be registered with the server and hence could have NAT state.
- if (rr->NATinfo.clientContext)
- {
- mDNS_StopNATOperation_internal(m, &rr->NATinfo);
- rr->NATinfo.clientContext = mDNSNULL;
- }
- if (rr->nta) { CancelGetZoneData(m, rr->nta); rr->nta = mDNSNULL; }
- if (rr->tcp) { DisposeTCPConn(rr->tcp); rr->tcp = mDNSNULL; }
- if (m->NextuDNSEvent - (rr->LastAPTime + rr->ThisAPInterval) >= 0)
- m->NextuDNSEvent = (rr->LastAPTime + rr->ThisAPInterval);
- }
-
-// Two records qualify to be local duplicates if:
-// (a) the RecordTypes are the same, or
-// (b) one is Unique and the other Verified
-// (c) either is in the process of deregistering
-#define RecordLDT(A,B) ((A)->resrec.RecordType == (B)->resrec.RecordType || \
- ((A)->resrec.RecordType | (B)->resrec.RecordType) == (kDNSRecordTypeUnique | kDNSRecordTypeVerified) || \
- ((A)->resrec.RecordType == kDNSRecordTypeDeregistering || (B)->resrec.RecordType == kDNSRecordTypeDeregistering))
-
-#define RecordIsLocalDuplicate(A,B) \
- ((A)->resrec.InterfaceID == (B)->resrec.InterfaceID && RecordLDT((A),(B)) && IdenticalResourceRecord(&(A)->resrec, &(B)->resrec))
-
-mDNSlocal AuthRecord *CheckAuthIdenticalRecord(AuthHash *r, AuthRecord *rr)
- {
- AuthGroup *a;
- AuthGroup **ag = &a;
- AuthRecord **rp;
- const mDNSu32 slot = AuthHashSlot(rr->resrec.name);
-
- a = AuthGroupForRecord(r, slot, &rr->resrec);
- if (!a) return mDNSNULL;
- rp = &(*ag)->members;
- while (*rp)
- {
- if (!RecordIsLocalDuplicate(*rp, rr))
- rp=&(*rp)->next;
- else
- {
- if ((*rp)->resrec.RecordType == kDNSRecordTypeDeregistering)
- {
- (*rp)->AnnounceCount = 0;
- rp=&(*rp)->next;
- }
- else return *rp;
- }
- }
- return (mDNSNULL);
- }
-
-mDNSlocal mDNSBool CheckAuthRecordConflict(AuthHash *r, AuthRecord *rr)
- {
- AuthGroup *a;
- AuthGroup **ag = &a;
- AuthRecord **rp;
- const mDNSu32 slot = AuthHashSlot(rr->resrec.name);
-
- a = AuthGroupForRecord(r, slot, &rr->resrec);
- if (!a) return mDNSfalse;
- rp = &(*ag)->members;
- while (*rp)
- {
- const AuthRecord *s1 = rr->RRSet ? rr->RRSet : rr;
- const AuthRecord *s2 = (*rp)->RRSet ? (*rp)->RRSet : *rp;
- if (s1 != s2 && SameResourceRecordSignature((*rp), rr) && !IdenticalSameNameRecord(&(*rp)->resrec, &rr->resrec))
- return mDNStrue;
- else
- rp=&(*rp)->next;
- }
- return (mDNSfalse);
- }
-
-// checks to see if "rr" is already present
-mDNSlocal AuthRecord *CheckAuthSameRecord(AuthHash *r, AuthRecord *rr)
- {
- AuthGroup *a;
- AuthGroup **ag = &a;
- AuthRecord **rp;
- const mDNSu32 slot = AuthHashSlot(rr->resrec.name);
-
- a = AuthGroupForRecord(r, slot, &rr->resrec);
- if (!a) return mDNSNULL;
- rp = &(*ag)->members;
- while (*rp)
- {
- if (*rp != rr)
- rp=&(*rp)->next;
- else
- {
- return *rp;
- }
- }
- return (mDNSNULL);
- }
-
-// Exported so uDNS.c can call this
-mDNSexport mStatus mDNS_Register_internal(mDNS *const m, AuthRecord *const rr)
- {
- domainname *target = GetRRDomainNameTarget(&rr->resrec);
- AuthRecord *r;
- AuthRecord **p = &m->ResourceRecords;
- AuthRecord **d = &m->DuplicateRecords;
-
- if ((mDNSs32)rr->resrec.rroriginalttl <= 0)
- { LogMsg("mDNS_Register_internal: TTL %X should be 1 - 0x7FFFFFFF %s", rr->resrec.rroriginalttl, ARDisplayString(m, rr)); return(mStatus_BadParamErr); }
-
- if (!rr->resrec.RecordType)
- { LogMsg("mDNS_Register_internal: RecordType must be non-zero %s", ARDisplayString(m, rr)); return(mStatus_BadParamErr); }
-
- if (m->ShutdownTime)
- { LogMsg("mDNS_Register_internal: Shutting down, can't register %s", ARDisplayString(m, rr)); return(mStatus_ServiceNotRunning); }
-
- if (m->DivertMulticastAdvertisements && !AuthRecord_uDNS(rr))
- {
- mDNSInterfaceID previousID = rr->resrec.InterfaceID;
- if (rr->resrec.InterfaceID == mDNSInterface_Any || rr->resrec.InterfaceID == mDNSInterface_P2P)
- {
- rr->resrec.InterfaceID = mDNSInterface_LocalOnly;
- rr->ARType = AuthRecordLocalOnly;
- }
- if (rr->resrec.InterfaceID != mDNSInterface_LocalOnly)
- {
- NetworkInterfaceInfo *intf = FirstInterfaceForID(m, rr->resrec.InterfaceID);
- if (intf && !intf->Advertise){ rr->resrec.InterfaceID = mDNSInterface_LocalOnly; rr->ARType = AuthRecordLocalOnly; }
- }
- if (rr->resrec.InterfaceID != previousID)
- LogInfo("mDNS_Register_internal: Diverting record to local-only %s", ARDisplayString(m, rr));
- }
-
- if (RRLocalOnly(rr))
- {
- if (CheckAuthSameRecord(&m->rrauth, rr))
- {
- LogMsg("mDNS_Register_internal: ERROR!! Tried to register LocalOnly AuthRecord %p %##s (%s) that's already in the list",
- rr, rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype));
- return(mStatus_AlreadyRegistered);
- }
- }
- else
- {
- while (*p && *p != rr) p=&(*p)->next;
- if (*p)
- {
- LogMsg("mDNS_Register_internal: ERROR!! Tried to register AuthRecord %p %##s (%s) that's already in the list",
- rr, rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype));
- return(mStatus_AlreadyRegistered);
- }
- }
-
- while (*d && *d != rr) d=&(*d)->next;
- if (*d)
- {
- LogMsg("mDNS_Register_internal: ERROR!! Tried to register AuthRecord %p %##s (%s) that's already in the Duplicate list",
- rr, rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype));
- return(mStatus_AlreadyRegistered);
- }
-
- if (rr->DependentOn)
- {
- if (rr->resrec.RecordType == kDNSRecordTypeUnique)
- rr->resrec.RecordType = kDNSRecordTypeVerified;
- else
- {
- LogMsg("mDNS_Register_internal: ERROR! %##s (%s): rr->DependentOn && RecordType != kDNSRecordTypeUnique",
- rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype));
- return(mStatus_Invalid);
- }
- if (!(rr->DependentOn->resrec.RecordType & (kDNSRecordTypeUnique | kDNSRecordTypeVerified | kDNSRecordTypeKnownUnique)))
- {
- LogMsg("mDNS_Register_internal: ERROR! %##s (%s): rr->DependentOn->RecordType bad type %X",
- rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype), rr->DependentOn->resrec.RecordType);
- return(mStatus_Invalid);
- }
- }
-
- // If this resource record is referencing a specific interface, make sure it exists.
- // Skip checks for LocalOnly and P2P as they are not valid InterfaceIDs. Also, for scoped
- // entries in /etc/hosts skip that check as that interface may not be valid at this time.
- if (rr->resrec.InterfaceID && rr->ARType != AuthRecordLocalOnly && rr->ARType != AuthRecordP2P)
- {
- NetworkInterfaceInfo *intf = FirstInterfaceForID(m, rr->resrec.InterfaceID);
- if (!intf)
- {
- debugf("mDNS_Register_internal: Bogus InterfaceID %p in resource record", rr->resrec.InterfaceID);
- return(mStatus_BadReferenceErr);
- }
- }
-
- rr->next = mDNSNULL;
-
- // Field Group 1: The actual information pertaining to this resource record
- // Set up by client prior to call
-
- // Field Group 2: Persistent metadata for Authoritative Records
-// rr->Additional1 = set to mDNSNULL in mDNS_SetupResourceRecord; may be overridden by client
-// rr->Additional2 = set to mDNSNULL in mDNS_SetupResourceRecord; may be overridden by client
-// rr->DependentOn = set to mDNSNULL in mDNS_SetupResourceRecord; may be overridden by client
-// rr->RRSet = set to mDNSNULL in mDNS_SetupResourceRecord; may be overridden by client
-// rr->Callback = already set in mDNS_SetupResourceRecord
-// rr->Context = already set in mDNS_SetupResourceRecord
-// rr->RecordType = already set in mDNS_SetupResourceRecord
-// rr->HostTarget = set to mDNSfalse in mDNS_SetupResourceRecord; may be overridden by client
-// rr->AllowRemoteQuery = set to mDNSfalse in mDNS_SetupResourceRecord; may be overridden by client
- // Make sure target is not uninitialized data, or we may crash writing debugging log messages
- if (rr->AutoTarget && target) target->c[0] = 0;
-
- // Field Group 3: Transient state for Authoritative Records
- rr->Acknowledged = mDNSfalse;
- rr->ProbeCount = DefaultProbeCountForRecordType(rr->resrec.RecordType);
- rr->AnnounceCount = InitialAnnounceCount;
- rr->RequireGoodbye = mDNSfalse;
- rr->AnsweredLocalQ = mDNSfalse;
- rr->IncludeInProbe = mDNSfalse;
- rr->ImmedUnicast = mDNSfalse;
- rr->SendNSECNow = mDNSNULL;
- rr->ImmedAnswer = mDNSNULL;
- rr->ImmedAdditional = mDNSNULL;
- rr->SendRNow = mDNSNULL;
- rr->v4Requester = zerov4Addr;
- rr->v6Requester = zerov6Addr;
- rr->NextResponse = mDNSNULL;
- rr->NR_AnswerTo = mDNSNULL;
- rr->NR_AdditionalTo = mDNSNULL;
- if (!rr->AutoTarget) InitializeLastAPTime(m, rr);
-// rr->LastAPTime = Set for us in InitializeLastAPTime()
-// rr->LastMCTime = Set for us in InitializeLastAPTime()
-// rr->LastMCInterface = Set for us in InitializeLastAPTime()
- rr->NewRData = mDNSNULL;
- rr->newrdlength = 0;
- rr->UpdateCallback = mDNSNULL;
- rr->UpdateCredits = kMaxUpdateCredits;
- rr->NextUpdateCredit = 0;
- rr->UpdateBlocked = 0;
-
- // For records we're holding as proxy (except reverse-mapping PTR records) two announcements is sufficient
- if (rr->WakeUp.HMAC.l[0] && !rr->AddressProxy.type) rr->AnnounceCount = 2;
-
- // Field Group 4: Transient uDNS state for Authoritative Records
- rr->state = regState_Zero;
- rr->uselease = 0;
- rr->expire = 0;
- rr->Private = 0;
- rr->updateid = zeroID;
- rr->zone = rr->resrec.name;
- rr->nta = mDNSNULL;
- rr->tcp = mDNSNULL;
- rr->OrigRData = 0;
- rr->OrigRDLen = 0;
- rr->InFlightRData = 0;
- rr->InFlightRDLen = 0;
- rr->QueuedRData = 0;
- rr->QueuedRDLen = 0;
- //mDNSPlatformMemZero(&rr->NATinfo, sizeof(rr->NATinfo));
- // We should be recording the actual internal port for this service record here. Once we initiate our NAT mapping
- // request we'll subsequently overwrite srv.port with the allocated external NAT port -- potentially multiple
- // times with different values if the external NAT port changes during the lifetime of the service registration.
- //if (rr->resrec.rrtype == kDNSType_SRV) rr->NATinfo.IntPort = rr->resrec.rdata->u.srv.port;
-
-// rr->resrec.interface = already set in mDNS_SetupResourceRecord
-// rr->resrec.name->c = MUST be set by client
-// rr->resrec.rrtype = already set in mDNS_SetupResourceRecord
-// rr->resrec.rrclass = already set in mDNS_SetupResourceRecord
-// rr->resrec.rroriginalttl = already set in mDNS_SetupResourceRecord
-// rr->resrec.rdata = MUST be set by client, unless record type is CNAME or PTR and rr->HostTarget is set
-
- // BIND named (name daemon) doesn't allow TXT records with zero-length rdata. This is strictly speaking correct,
- // since RFC 1035 specifies a TXT record as "One or more <character-string>s", not "Zero or more <character-string>s".
- // Since some legacy apps try to create zero-length TXT records, we'll silently correct it here.
- if (rr->resrec.rrtype == kDNSType_TXT && rr->resrec.rdlength == 0) { rr->resrec.rdlength = 1; rr->resrec.rdata->u.txt.c[0] = 0; }
-
- if (rr->AutoTarget)
- {
- SetTargetToHostName(m, rr); // Also sets rdlength and rdestimate for us, and calls InitializeLastAPTime();
-#ifndef UNICAST_DISABLED
- // If we have no target record yet, SetTargetToHostName will set rr->state == regState_NoTarget
- // In this case we leave the record half-formed in the list, and later we'll remove it from the list and re-add it properly.
- if (rr->state == regState_NoTarget)
- {
- // Initialize the target so that we don't crash while logging etc.
- domainname *tar = GetRRDomainNameTarget(&rr->resrec);
- if (tar) tar->c[0] = 0;
- LogInfo("mDNS_Register_internal: record %s in NoTarget state", ARDisplayString(m, rr));
- }
-#endif
- }
- else
- {
- rr->resrec.rdlength = GetRDLength(&rr->resrec, mDNSfalse);
- rr->resrec.rdestimate = GetRDLength(&rr->resrec, mDNStrue);
- }
-
- if (!ValidateDomainName(rr->resrec.name))
- { LogMsg("Attempt to register record with invalid name: %s", ARDisplayString(m, rr)); return(mStatus_Invalid); }
-
- // Don't do this until *after* we've set rr->resrec.rdlength
- if (!ValidateRData(rr->resrec.rrtype, rr->resrec.rdlength, rr->resrec.rdata))
- { LogMsg("Attempt to register record with invalid rdata: %s", ARDisplayString(m, rr)); return(mStatus_Invalid); }
-
- rr->resrec.namehash = DomainNameHashValue(rr->resrec.name);
- rr->resrec.rdatahash = target ? DomainNameHashValue(target) : RDataHashValue(&rr->resrec);
-
- if (RRLocalOnly(rr))
- {
- // If this is supposed to be unique, make sure we don't have any name conflicts.
- // If we found a conflict, we may still want to insert the record in the list but mark it appropriately
- // (kDNSRecordTypeDeregistering) so that we deliver RMV events to the application. But this causes more
- // complications and not clear whether there are any benefits. See rdar:9304275 for details.
- // Hence, just bail out.
- if (rr->resrec.RecordType & kDNSRecordTypeUniqueMask)
- {
- if (CheckAuthRecordConflict(&m->rrauth, rr))
- {
- LogInfo("mDNS_Register_internal: Name conflict %s (%p), InterfaceID %p", ARDisplayString(m, rr), rr, rr->resrec.InterfaceID);
- return mStatus_NameConflict;
- }
- }
- }
-
- // For uDNS records, we don't support duplicate checks at this time.
-#ifndef UNICAST_DISABLED
- if (AuthRecord_uDNS(rr))
- {
- if (!m->NewLocalRecords) m->NewLocalRecords = rr;
- // When we called SetTargetToHostName, it may have caused mDNS_Register_internal to be re-entered, appending new
- // records to the list, so we now need to update p to advance to the new end to the list before appending our new record.
- // Note that for AutoTunnel this should never happen, but this check makes the code future-proof.
- while (*p) p=&(*p)->next;
- *p = rr;
- if (rr->resrec.RecordType == kDNSRecordTypeUnique) rr->resrec.RecordType = kDNSRecordTypeVerified;
- rr->ProbeCount = 0;
- rr->AnnounceCount = 0;
- if (rr->state != regState_NoTarget) ActivateUnicastRegistration(m, rr);
- return(mStatus_NoError); // <--- Note: For unicast records, code currently bails out at this point
- }
-#endif
-
- // Now that we've finished building our new record, make sure it's not identical to one we already have
- if (RRLocalOnly(rr))
- {
- rr->ProbeCount = 0;
- rr->AnnounceCount = 0;
- r = CheckAuthIdenticalRecord(&m->rrauth, rr);
- }
- else
- {
- for (r = m->ResourceRecords; r; r=r->next)
- if (RecordIsLocalDuplicate(r, rr))
- {
- if (r->resrec.RecordType == kDNSRecordTypeDeregistering) r->AnnounceCount = 0;
- else break;
- }
- }
-
- if (r)
- {
- debugf("mDNS_Register_internal:Adding to duplicate list %s", ARDisplayString(m,rr));
- *d = rr;
- // If the previous copy of this record is already verified unique,
- // then indicate that we should move this record promptly to kDNSRecordTypeUnique state.
- // Setting ProbeCount to zero will cause SendQueries() to advance this record to
- // kDNSRecordTypeVerified state and call the client callback at the next appropriate time.
- if (rr->resrec.RecordType == kDNSRecordTypeUnique && r->resrec.RecordType == kDNSRecordTypeVerified)
- rr->ProbeCount = 0;
- }
- else
- {
- debugf("mDNS_Register_internal: Adding to active record list %s", ARDisplayString(m,rr));
- if (RRLocalOnly(rr))
- {
- AuthGroup *ag;
- ag = InsertAuthRecord(m, &m->rrauth, rr);
- if (ag && !ag->NewLocalOnlyRecords) {
- m->NewLocalOnlyRecords = mDNStrue;
- ag->NewLocalOnlyRecords = rr;
- }
- // No probing for LocalOnly records, Acknowledge them right away
- if (rr->resrec.RecordType == kDNSRecordTypeUnique) rr->resrec.RecordType = kDNSRecordTypeVerified;
- AcknowledgeRecord(m, rr);
- return(mStatus_NoError);
- }
- else
- {
- if (!m->NewLocalRecords) m->NewLocalRecords = rr;
- *p = rr;
- }
- }
-
- if (!AuthRecord_uDNS(rr)) // This check is superfluous, given that for unicast records we (currently) bail out above
- {
- // For records that are not going to probe, acknowledge them right away
- if (rr->resrec.RecordType != kDNSRecordTypeUnique && rr->resrec.RecordType != kDNSRecordTypeDeregistering)
- AcknowledgeRecord(m, rr);
-
- // Adding a record may affect whether or not we should sleep
- mDNS_UpdateAllowSleep(m);
- }
-
- return(mStatus_NoError);
- }
-
-mDNSlocal void RecordProbeFailure(mDNS *const m, const AuthRecord *const rr)
- {
- m->ProbeFailTime = m->timenow;
- m->NumFailedProbes++;
- // If we've had fifteen or more probe failures, rate-limit to one every five seconds.
- // If a bunch of hosts have all been configured with the same name, then they'll all
- // conflict and run through the same series of names: name-2, name-3, name-4, etc.,
- // up to name-10. After that they'll start adding random increments in the range 1-100,
- // so they're more likely to branch out in the available namespace and settle on a set of
- // unique names quickly. If after five more tries the host is still conflicting, then we
- // may have a serious problem, so we start rate-limiting so we don't melt down the network.
- if (m->NumFailedProbes >= 15)
- {
- m->SuppressProbes = NonZeroTime(m->timenow + mDNSPlatformOneSecond * 5);
- LogMsg("Excessive name conflicts (%lu) for %##s (%s); rate limiting in effect",
- m->NumFailedProbes, rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype));
- }
- }
-
-mDNSlocal void CompleteRDataUpdate(mDNS *const m, AuthRecord *const rr)
- {
- RData *OldRData = rr->resrec.rdata;
- mDNSu16 OldRDLen = rr->resrec.rdlength;
- SetNewRData(&rr->resrec, rr->NewRData, rr->newrdlength); // Update our rdata
- rr->NewRData = mDNSNULL; // Clear the NewRData pointer ...
- if (rr->UpdateCallback)
- rr->UpdateCallback(m, rr, OldRData, OldRDLen); // ... and let the client know
- }
-
-// Note: mDNS_Deregister_internal can call a user callback, which may change the record list and/or question list.
-// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this.
-// Exported so uDNS.c can call this
-mDNSexport mStatus mDNS_Deregister_internal(mDNS *const m, AuthRecord *const rr, mDNS_Dereg_type drt)
- {
- AuthRecord *r2;
- mDNSu8 RecordType = rr->resrec.RecordType;
- AuthRecord **p = &m->ResourceRecords; // Find this record in our list of active records
- mDNSBool dupList = mDNSfalse;
-
- if (RRLocalOnly(rr))
- {
- AuthGroup *a;
- AuthGroup **ag = &a;
- AuthRecord **rp;
- const mDNSu32 slot = AuthHashSlot(rr->resrec.name);
-
- a = AuthGroupForRecord(&m->rrauth, slot, &rr->resrec);
- if (!a) return mDNSfalse;
- rp = &(*ag)->members;
- while (*rp && *rp != rr) rp=&(*rp)->next;
- p = rp;
- }
- else
- {
- while (*p && *p != rr) p=&(*p)->next;
- }
-
- if (*p)
- {
- // We found our record on the main list. See if there are any duplicates that need special handling.
- if (drt == mDNS_Dereg_conflict) // If this was a conflict, see that all duplicates get the same treatment
- {
- // Scan for duplicates of rr, and mark them for deregistration at the end of this routine, after we've finished
- // deregistering rr. We need to do this scan *before* we give the client the chance to free and reuse the rr memory.
- for (r2 = m->DuplicateRecords; r2; r2=r2->next) if (RecordIsLocalDuplicate(r2, rr)) r2->ProbeCount = 0xFF;
- }
- else
- {
- // Before we delete the record (and potentially send a goodbye packet)
- // first see if we have a record on the duplicate list ready to take over from it.
- AuthRecord **d = &m->DuplicateRecords;
- while (*d && !RecordIsLocalDuplicate(*d, rr)) d=&(*d)->next;
- if (*d)
- {
- AuthRecord *dup = *d;
- debugf("mDNS_Register_internal: Duplicate record %p taking over from %p %##s (%s)",
- dup, rr, rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype));
- *d = dup->next; // Cut replacement record from DuplicateRecords list
- if (RRLocalOnly(rr))
- {
- dup->next = mDNSNULL;
- if (!InsertAuthRecord(m, &m->rrauth, dup)) LogMsg("mDNS_Deregister_internal: ERROR!! cannot insert %s", ARDisplayString(m, dup));
- }
- else
- {
- dup->next = rr->next; // And then...
- rr->next = dup; // ... splice it in right after the record we're about to delete
- }
- dup->resrec.RecordType = rr->resrec.RecordType;
- dup->ProbeCount = rr->ProbeCount;
- dup->AnnounceCount = rr->AnnounceCount;
- dup->RequireGoodbye = rr->RequireGoodbye;
- dup->AnsweredLocalQ = rr->AnsweredLocalQ;
- dup->ImmedAnswer = rr->ImmedAnswer;
- dup->ImmedUnicast = rr->ImmedUnicast;
- dup->ImmedAdditional = rr->ImmedAdditional;
- dup->v4Requester = rr->v4Requester;
- dup->v6Requester = rr->v6Requester;
- dup->ThisAPInterval = rr->ThisAPInterval;
- dup->LastAPTime = rr->LastAPTime;
- dup->LastMCTime = rr->LastMCTime;
- dup->LastMCInterface = rr->LastMCInterface;
- dup->Private = rr->Private;
- dup->state = rr->state;
- rr->RequireGoodbye = mDNSfalse;
- rr->AnsweredLocalQ = mDNSfalse;
- }
- }
- }
- else
- {
- // We didn't find our record on the main list; try the DuplicateRecords list instead.
- p = &m->DuplicateRecords;
- while (*p && *p != rr) p=&(*p)->next;
- // If we found our record on the duplicate list, then make sure we don't send a goodbye for it
- if (*p) { rr->RequireGoodbye = mDNSfalse; dupList = mDNStrue; }
- if (*p) debugf("mDNS_Deregister_internal: Deleting DuplicateRecord %p %##s (%s)",
- rr, rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype));
- }
-
- if (!*p)
- {
- // No need to log an error message if we already know this is a potentially repeated deregistration
- if (drt != mDNS_Dereg_repeat)
- LogMsg("mDNS_Deregister_internal: Record %p not found in list %s", rr, ARDisplayString(m,rr));
- return(mStatus_BadReferenceErr);
- }
-
- // If this is a shared record and we've announced it at least once,
- // we need to retract that announcement before we delete the record
-
- // If this is a record (including mDNSInterface_LocalOnly records) for which we've given local-only answers then
- // it's tempting to just do "AnswerAllLocalQuestionsWithLocalAuthRecord(m, rr, mDNSfalse)" here, but that would not not be safe.
- // The AnswerAllLocalQuestionsWithLocalAuthRecord routine walks the question list invoking client callbacks, using the "m->CurrentQuestion"
- // mechanism to cope with the client callback modifying the question list while that's happening.
- // However, mDNS_Deregister could have been called from a client callback (e.g. from the domain enumeration callback FoundDomain)
- // which means that the "m->CurrentQuestion" mechanism is already in use to protect that list, so we can't use it twice.
- // More generally, if we invoke callbacks from within a client callback, then those callbacks could deregister other
- // records, thereby invoking yet more callbacks, without limit.
- // The solution is to defer delivering the "Remove" events until mDNS_Execute time, just like we do for sending
- // actual goodbye packets.
-
-#ifndef UNICAST_DISABLED
- if (AuthRecord_uDNS(rr))
- {
- if (rr->RequireGoodbye)
- {
- if (rr->tcp) { DisposeTCPConn(rr->tcp); rr->tcp = mDNSNULL; }
- rr->resrec.RecordType = kDNSRecordTypeDeregistering;
- m->LocalRemoveEvents = mDNStrue;
- uDNS_DeregisterRecord(m, rr);
- // At this point unconditionally we bail out
- // Either uDNS_DeregisterRecord will have completed synchronously, and called CompleteDeregistration,
- // which calls us back here with RequireGoodbye set to false, or it will have initiated the deregistration
- // process and will complete asynchronously. Either way we don't need to do anything more here.
- return(mStatus_NoError);
- }
- // Sometimes the records don't complete proper deregistration i.e., don't wait for a response
- // from the server. In that case, if the records have been part of a group update, clear the
- // state here. Some recors e.g., AutoTunnel gets reused without ever being completely initialized
- rr->updateid = zeroID;
-
- // We defer cleaning up NAT state only after sending goodbyes. This is important because
- // RecordRegistrationGotZoneData guards against creating NAT state if clientContext is non-NULL.
- // This happens today when we turn on/off interface where we get multiple network transitions
- // and RestartRecordGetZoneData triggers re-registration of the resource records even though
- // they may be in Registered state which causes NAT information to be setup multiple times. Defering
- // the cleanup here keeps clientContext non-NULL and hence prevents that. Note that cleaning up
- // NAT state here takes care of the case where we did not send goodbyes at all.
- if (rr->NATinfo.clientContext)
- {
- mDNS_StopNATOperation_internal(m, &rr->NATinfo);
- rr->NATinfo.clientContext = mDNSNULL;
- }
- if (rr->nta) { CancelGetZoneData(m, rr->nta); rr->nta = mDNSNULL; }
- if (rr->tcp) { DisposeTCPConn(rr->tcp); rr->tcp = mDNSNULL; }
- }
-#endif // UNICAST_DISABLED
-
- if (RecordType == kDNSRecordTypeUnregistered)
- LogMsg("mDNS_Deregister_internal: %s already marked kDNSRecordTypeUnregistered", ARDisplayString(m, rr));
- else if (RecordType == kDNSRecordTypeDeregistering)
- {
- LogMsg("mDNS_Deregister_internal: %s already marked kDNSRecordTypeDeregistering", ARDisplayString(m, rr));
- return(mStatus_BadReferenceErr);
- }
-
- // <rdar://problem/7457925> Local-only questions don't get remove events for unique records
- // We may want to consider changing this code so that we generate local-only question "rmv"
- // events (and maybe goodbye packets too) for unique records as well as for shared records
- // Note: If we change the logic for this "if" statement, need to ensure that the code in
- // CompleteDeregistration() sets the appropriate state variables to gaurantee that "else"
- // clause will execute here and the record will be cut from the list.
- if (rr->WakeUp.HMAC.l[0] ||
- (RecordType == kDNSRecordTypeShared && (rr->RequireGoodbye || rr->AnsweredLocalQ)))
- {
- verbosedebugf("mDNS_Deregister_internal: Starting deregistration for %s", ARDisplayString(m, rr));
- rr->resrec.RecordType = kDNSRecordTypeDeregistering;
- rr->resrec.rroriginalttl = 0;
- rr->AnnounceCount = rr->WakeUp.HMAC.l[0] ? WakeupCount : (drt == mDNS_Dereg_rapid) ? 1 : GoodbyeCount;
- rr->ThisAPInterval = mDNSPlatformOneSecond * 2;
- rr->LastAPTime = m->timenow - rr->ThisAPInterval;
- m->LocalRemoveEvents = mDNStrue;
- if (m->NextScheduledResponse - (m->timenow + mDNSPlatformOneSecond/10) >= 0)
- m->NextScheduledResponse = (m->timenow + mDNSPlatformOneSecond/10);
- }
- else
- {
- if (!dupList && RRLocalOnly(rr))
- {
- AuthGroup *ag = RemoveAuthRecord(m, &m->rrauth, rr);
- if (ag->NewLocalOnlyRecords == rr) ag->NewLocalOnlyRecords = rr->next;
- }
- else
- {
- *p = rr->next; // Cut this record from the list
- if (m->NewLocalRecords == rr) m->NewLocalRecords = rr->next;
- }
- // If someone is about to look at this, bump the pointer forward
- if (m->CurrentRecord == rr) m->CurrentRecord = rr->next;
- rr->next = mDNSNULL;
-
- // Should we generate local remove events here?
- // i.e. something like:
- // if (rr->AnsweredLocalQ) { AnswerAllLocalQuestionsWithLocalAuthRecord(m, rr, mDNSfalse); rr->AnsweredLocalQ = mDNSfalse; }
-
- verbosedebugf("mDNS_Deregister_internal: Deleting record for %s", ARDisplayString(m, rr));
- rr->resrec.RecordType = kDNSRecordTypeUnregistered;
-
- if ((drt == mDNS_Dereg_conflict || drt == mDNS_Dereg_repeat) && RecordType == kDNSRecordTypeShared)
- debugf("mDNS_Deregister_internal: Cannot have a conflict on a shared record! %##s (%s)",
- rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype));
-
- // If we have an update queued up which never executed, give the client a chance to free that memory
- if (rr->NewRData) CompleteRDataUpdate(m, rr); // Update our rdata, clear the NewRData pointer, and return memory to the client
-
-
- // CAUTION: MUST NOT do anything more with rr after calling rr->Callback(), because the client's callback function
- // is allowed to do anything, including starting/stopping queries, registering/deregistering records, etc.
- // In this case the likely client action to the mStatus_MemFree message is to free the memory,
- // so any attempt to touch rr after this is likely to lead to a crash.
- if (drt != mDNS_Dereg_conflict)
- {
- mDNS_DropLockBeforeCallback(); // Allow client to legally make mDNS API calls from the callback
- LogInfo("mDNS_Deregister_internal: mStatus_MemFree for %s", ARDisplayString(m, rr));
- if (rr->RecordCallback)
- rr->RecordCallback(m, rr, mStatus_MemFree); // MUST NOT touch rr after this
- mDNS_ReclaimLockAfterCallback(); // Decrement mDNS_reentrancy to block mDNS API calls again
- }
- else
- {
- RecordProbeFailure(m, rr);
- mDNS_DropLockBeforeCallback(); // Allow client to legally make mDNS API calls from the callback
- if (rr->RecordCallback)
- rr->RecordCallback(m, rr, mStatus_NameConflict); // MUST NOT touch rr after this
- mDNS_ReclaimLockAfterCallback(); // Decrement mDNS_reentrancy to block mDNS API calls again
- // Now that we've finished deregistering rr, check our DuplicateRecords list for any that we marked previously.
- // Note that with all the client callbacks going on, by the time we get here all the
- // records we marked may have been explicitly deregistered by the client anyway.
- r2 = m->DuplicateRecords;
- while (r2)
- {
- if (r2->ProbeCount != 0xFF) r2 = r2->next;
- else { mDNS_Deregister_internal(m, r2, mDNS_Dereg_conflict); r2 = m->DuplicateRecords; }
- }
- }
- }
- mDNS_UpdateAllowSleep(m);
- return(mStatus_NoError);
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - Packet Sending Functions
-#endif
-
-mDNSlocal void AddRecordToResponseList(AuthRecord ***nrpp, AuthRecord *rr, AuthRecord *add)
- {
- if (rr->NextResponse == mDNSNULL && *nrpp != &rr->NextResponse)
- {
- **nrpp = rr;
- // NR_AdditionalTo must point to a record with NR_AnswerTo set (and not NR_AdditionalTo)
- // If 'add' does not meet this requirement, then follow its NR_AdditionalTo pointer to a record that does
- // The referenced record will definitely be acceptable (by recursive application of this rule)
- if (add && add->NR_AdditionalTo) add = add->NR_AdditionalTo;
- rr->NR_AdditionalTo = add;
- *nrpp = &rr->NextResponse;
- }
- debugf("AddRecordToResponseList: %##s (%s) already in list", rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype));
- }
-
-mDNSlocal void AddAdditionalsToResponseList(mDNS *const m, AuthRecord *ResponseRecords, AuthRecord ***nrpp, const mDNSInterfaceID InterfaceID)
- {
- AuthRecord *rr, *rr2;
- for (rr=ResponseRecords; rr; rr=rr->NextResponse) // For each record we plan to put
- {
- // (Note: This is an "if", not a "while". If we add a record, we'll find it again
- // later in the "for" loop, and we will follow further "additional" links then.)
- if (rr->Additional1 && ResourceRecordIsValidInterfaceAnswer(rr->Additional1, InterfaceID))
- AddRecordToResponseList(nrpp, rr->Additional1, rr);
-
- if (rr->Additional2 && ResourceRecordIsValidInterfaceAnswer(rr->Additional2, InterfaceID))
- AddRecordToResponseList(nrpp, rr->Additional2, rr);
-
- // For SRV records, automatically add the Address record(s) for the target host
- if (rr->resrec.rrtype == kDNSType_SRV)
- {
- for (rr2=m->ResourceRecords; rr2; rr2=rr2->next) // Scan list of resource records
- if (RRTypeIsAddressType(rr2->resrec.rrtype) && // For all address records (A/AAAA) ...
- ResourceRecordIsValidInterfaceAnswer(rr2, InterfaceID) && // ... which are valid for answer ...
- rr->resrec.rdatahash == rr2->resrec.namehash && // ... whose name is the name of the SRV target
- SameDomainName(&rr->resrec.rdata->u.srv.target, rr2->resrec.name))
- AddRecordToResponseList(nrpp, rr2, rr);
- }
- else if (RRTypeIsAddressType(rr->resrec.rrtype)) // For A or AAAA, put counterpart as additional
- {
- for (rr2=m->ResourceRecords; rr2; rr2=rr2->next) // Scan list of resource records
- if (RRTypeIsAddressType(rr2->resrec.rrtype) && // For all address records (A/AAAA) ...
- ResourceRecordIsValidInterfaceAnswer(rr2, InterfaceID) && // ... which are valid for answer ...
- rr->resrec.namehash == rr2->resrec.namehash && // ... and have the same name
- SameDomainName(rr->resrec.name, rr2->resrec.name))
- AddRecordToResponseList(nrpp, rr2, rr);
- }
- else if (rr->resrec.rrtype == kDNSType_PTR) // For service PTR, see if we want to add DeviceInfo record
- {
- if (ResourceRecordIsValidInterfaceAnswer(&m->DeviceInfo, InterfaceID) &&
- SameDomainLabel(rr->resrec.rdata->u.name.c, m->DeviceInfo.resrec.name->c))
- AddRecordToResponseList(nrpp, &m->DeviceInfo, rr);
- }
- }
- }
-
-mDNSlocal void SendDelayedUnicastResponse(mDNS *const m, const mDNSAddr *const dest, const mDNSInterfaceID InterfaceID)
- {
- AuthRecord *rr;
- AuthRecord *ResponseRecords = mDNSNULL;
- AuthRecord **nrp = &ResponseRecords;
-
- // Make a list of all our records that need to be unicast to this destination
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- {
- // If we find we can no longer unicast this answer, clear ImmedUnicast
- if (rr->ImmedAnswer == mDNSInterfaceMark ||
- mDNSSameIPv4Address(rr->v4Requester, onesIPv4Addr) ||
- mDNSSameIPv6Address(rr->v6Requester, onesIPv6Addr) )
- rr->ImmedUnicast = mDNSfalse;
-
- if (rr->ImmedUnicast && rr->ImmedAnswer == InterfaceID)
- if ((dest->type == mDNSAddrType_IPv4 && mDNSSameIPv4Address(rr->v4Requester, dest->ip.v4)) ||
- (dest->type == mDNSAddrType_IPv6 && mDNSSameIPv6Address(rr->v6Requester, dest->ip.v6)))
- {
- rr->ImmedAnswer = mDNSNULL; // Clear the state fields
- rr->ImmedUnicast = mDNSfalse;
- rr->v4Requester = zerov4Addr;
- rr->v6Requester = zerov6Addr;
- if (rr->NextResponse == mDNSNULL && nrp != &rr->NextResponse) // rr->NR_AnswerTo
- { rr->NR_AnswerTo = (mDNSu8*)~0; *nrp = rr; nrp = &rr->NextResponse; }
- }
- }
-
- AddAdditionalsToResponseList(m, ResponseRecords, &nrp, InterfaceID);
-
- while (ResponseRecords)
- {
- mDNSu8 *responseptr = m->omsg.data;
- mDNSu8 *newptr;
- InitializeDNSMessage(&m->omsg.h, zeroID, ResponseFlags);
-
- // Put answers in the packet
- while (ResponseRecords && ResponseRecords->NR_AnswerTo)
- {
- rr = ResponseRecords;
- if (rr->resrec.RecordType & kDNSRecordTypeUniqueMask)
- rr->resrec.rrclass |= kDNSClass_UniqueRRSet; // Temporarily set the cache flush bit so PutResourceRecord will set it
- newptr = PutResourceRecord(&m->omsg, responseptr, &m->omsg.h.numAnswers, &rr->resrec);
- rr->resrec.rrclass &= ~kDNSClass_UniqueRRSet; // Make sure to clear cache flush bit back to normal state
- if (!newptr && m->omsg.h.numAnswers) break; // If packet full, send it now
- if (newptr) responseptr = newptr;
- ResponseRecords = rr->NextResponse;
- rr->NextResponse = mDNSNULL;
- rr->NR_AnswerTo = mDNSNULL;
- rr->NR_AdditionalTo = mDNSNULL;
- rr->RequireGoodbye = mDNStrue;
- }
-
- // Add additionals, if there's space
- while (ResponseRecords && !ResponseRecords->NR_AnswerTo)
- {
- rr = ResponseRecords;
- if (rr->resrec.RecordType & kDNSRecordTypeUniqueMask)
- rr->resrec.rrclass |= kDNSClass_UniqueRRSet; // Temporarily set the cache flush bit so PutResourceRecord will set it
- newptr = PutResourceRecord(&m->omsg, responseptr, &m->omsg.h.numAdditionals, &rr->resrec);
- rr->resrec.rrclass &= ~kDNSClass_UniqueRRSet; // Make sure to clear cache flush bit back to normal state
-
- if (newptr) responseptr = newptr;
- if (newptr && m->omsg.h.numAnswers) rr->RequireGoodbye = mDNStrue;
- else if (rr->resrec.RecordType & kDNSRecordTypeUniqueMask) rr->ImmedAnswer = mDNSInterfaceMark;
- ResponseRecords = rr->NextResponse;
- rr->NextResponse = mDNSNULL;
- rr->NR_AnswerTo = mDNSNULL;
- rr->NR_AdditionalTo = mDNSNULL;
- }
-
- if (m->omsg.h.numAnswers)
- mDNSSendDNSMessage(m, &m->omsg, responseptr, InterfaceID, mDNSNULL, dest, MulticastDNSPort, mDNSNULL, mDNSNULL);
- }
- }
-
-// CompleteDeregistration guarantees that on exit the record will have been cut from the m->ResourceRecords list
-// and the client's mStatus_MemFree callback will have been invoked
-mDNSexport void CompleteDeregistration(mDNS *const m, AuthRecord *rr)
- {
- LogInfo("CompleteDeregistration: called for Resource record %s", ARDisplayString(m, rr));
- // Clearing rr->RequireGoodbye signals mDNS_Deregister_internal() that
- // it should go ahead and immediately dispose of this registration
- rr->resrec.RecordType = kDNSRecordTypeShared;
- rr->RequireGoodbye = mDNSfalse;
- rr->WakeUp.HMAC = zeroEthAddr;
- if (rr->AnsweredLocalQ) { AnswerAllLocalQuestionsWithLocalAuthRecord(m, rr, mDNSfalse); rr->AnsweredLocalQ = mDNSfalse; }
- mDNS_Deregister_internal(m, rr, mDNS_Dereg_normal); // Don't touch rr after this
- }
-
-// DiscardDeregistrations is used on shutdown and sleep to discard (forcibly and immediately)
-// any deregistering records that remain in the m->ResourceRecords list.
-// DiscardDeregistrations calls mDNS_Deregister_internal which can call a user callback,
-// which may change the record list and/or question list.
-// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this.
-mDNSlocal void DiscardDeregistrations(mDNS *const m)
- {
- if (m->CurrentRecord)
- LogMsg("DiscardDeregistrations ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord));
- m->CurrentRecord = m->ResourceRecords;
-
- while (m->CurrentRecord)
- {
- AuthRecord *rr = m->CurrentRecord;
- if (!AuthRecord_uDNS(rr) && rr->resrec.RecordType == kDNSRecordTypeDeregistering)
- CompleteDeregistration(m, rr); // Don't touch rr after this
- else
- m->CurrentRecord = rr->next;
- }
- }
-
-mDNSlocal mStatus GetLabelDecimalValue(const mDNSu8 *const src, mDNSu8 *dst)
- {
- int i, val = 0;
- if (src[0] < 1 || src[0] > 3) return(mStatus_Invalid);
- for (i=1; i<=src[0]; i++)
- {
- if (src[i] < '0' || src[i] > '9') return(mStatus_Invalid);
- val = val * 10 + src[i] - '0';
- }
- if (val > 255) return(mStatus_Invalid);
- *dst = (mDNSu8)val;
- return(mStatus_NoError);
- }
-
-mDNSlocal mStatus GetIPv4FromName(mDNSAddr *const a, const domainname *const name)
- {
- int skip = CountLabels(name) - 6;
- if (skip < 0) { LogMsg("GetIPFromName: Need six labels in IPv4 reverse mapping name %##s", name); return mStatus_Invalid; }
- if (GetLabelDecimalValue(SkipLeadingLabels(name, skip+3)->c, &a->ip.v4.b[0]) ||
- GetLabelDecimalValue(SkipLeadingLabels(name, skip+2)->c, &a->ip.v4.b[1]) ||
- GetLabelDecimalValue(SkipLeadingLabels(name, skip+1)->c, &a->ip.v4.b[2]) ||
- GetLabelDecimalValue(SkipLeadingLabels(name, skip+0)->c, &a->ip.v4.b[3])) return mStatus_Invalid;
- a->type = mDNSAddrType_IPv4;
- return(mStatus_NoError);
- }
-
-#define HexVal(X) ( ((X) >= '0' && (X) <= '9') ? ((X) - '0' ) : \
- ((X) >= 'A' && (X) <= 'F') ? ((X) - 'A' + 10) : \
- ((X) >= 'a' && (X) <= 'f') ? ((X) - 'a' + 10) : -1)
-
-mDNSlocal mStatus GetIPv6FromName(mDNSAddr *const a, const domainname *const name)
- {
- int i, h, l;
- const domainname *n;
-
- int skip = CountLabels(name) - 34;
- if (skip < 0) { LogMsg("GetIPFromName: Need 34 labels in IPv6 reverse mapping name %##s", name); return mStatus_Invalid; }
-
- n = SkipLeadingLabels(name, skip);
- for (i=0; i<16; i++)
- {
- if (n->c[0] != 1) return mStatus_Invalid;
- l = HexVal(n->c[1]);
- n = (const domainname *)(n->c + 2);
-
- if (n->c[0] != 1) return mStatus_Invalid;
- h = HexVal(n->c[1]);
- n = (const domainname *)(n->c + 2);
-
- if (l<0 || h<0) return mStatus_Invalid;
- a->ip.v6.b[15-i] = (mDNSu8)((h << 4) | l);
- }
-
- a->type = mDNSAddrType_IPv6;
- return(mStatus_NoError);
- }
-
-mDNSlocal mDNSs32 ReverseMapDomainType(const domainname *const name)
- {
- int skip = CountLabels(name) - 2;
- if (skip >= 0)
- {
- const domainname *suffix = SkipLeadingLabels(name, skip);
- if (SameDomainName(suffix, (const domainname*)"\x7" "in-addr" "\x4" "arpa")) return mDNSAddrType_IPv4;
- if (SameDomainName(suffix, (const domainname*)"\x3" "ip6" "\x4" "arpa")) return mDNSAddrType_IPv6;
- }
- return(mDNSAddrType_None);
- }
-
-mDNSlocal void SendARP(mDNS *const m, const mDNSu8 op, const AuthRecord *const rr,
- const mDNSv4Addr *const spa, const mDNSEthAddr *const tha, const mDNSv4Addr *const tpa, const mDNSEthAddr *const dst)
- {
- int i;
- mDNSu8 *ptr = m->omsg.data;
- NetworkInterfaceInfo *intf = FirstInterfaceForID(m, rr->resrec.InterfaceID);
- if (!intf) { LogMsg("SendARP: No interface with InterfaceID %p found %s", rr->resrec.InterfaceID, ARDisplayString(m,rr)); return; }
-
- // 0x00 Destination address
- for (i=0; i<6; i++) *ptr++ = dst->b[i];
-
- // 0x06 Source address (Note: Since we don't currently set the BIOCSHDRCMPLT option, BPF will fill in the real interface address for us)
- for (i=0; i<6; i++) *ptr++ = intf->MAC.b[0];
-
- // 0x0C ARP Ethertype (0x0806)
- *ptr++ = 0x08; *ptr++ = 0x06;
-
- // 0x0E ARP header
- *ptr++ = 0x00; *ptr++ = 0x01; // Hardware address space; Ethernet = 1
- *ptr++ = 0x08; *ptr++ = 0x00; // Protocol address space; IP = 0x0800
- *ptr++ = 6; // Hardware address length
- *ptr++ = 4; // Protocol address length
- *ptr++ = 0x00; *ptr++ = op; // opcode; Request = 1, Response = 2
-
- // 0x16 Sender hardware address (our MAC address)
- for (i=0; i<6; i++) *ptr++ = intf->MAC.b[i];
-
- // 0x1C Sender protocol address
- for (i=0; i<4; i++) *ptr++ = spa->b[i];
-
- // 0x20 Target hardware address
- for (i=0; i<6; i++) *ptr++ = tha->b[i];
-
- // 0x26 Target protocol address
- for (i=0; i<4; i++) *ptr++ = tpa->b[i];
-
- // 0x2A Total ARP Packet length 42 bytes
- mDNSPlatformSendRawPacket(m->omsg.data, ptr, rr->resrec.InterfaceID);
- }
-
-mDNSlocal mDNSu16 CheckSum(const void *const data, mDNSs32 length, mDNSu32 sum)
- {
- const mDNSu16 *ptr = data;
- while (length > 0) { length -= 2; sum += *ptr++; }
- sum = (sum & 0xFFFF) + (sum >> 16);
- sum = (sum & 0xFFFF) + (sum >> 16);
- return(sum != 0xFFFF ? sum : 0);
- }
-
-mDNSlocal mDNSu16 IPv6CheckSum(const mDNSv6Addr *const src, const mDNSv6Addr *const dst, const mDNSu8 protocol, const void *const data, const mDNSu32 length)
- {
- IPv6PseudoHeader ph;
- ph.src = *src;
- ph.dst = *dst;
- ph.len.b[0] = length >> 24;
- ph.len.b[1] = length >> 16;
- ph.len.b[2] = length >> 8;
- ph.len.b[3] = length;
- ph.pro.b[0] = 0;
- ph.pro.b[1] = 0;
- ph.pro.b[2] = 0;
- ph.pro.b[3] = protocol;
- return CheckSum(&ph, sizeof(ph), CheckSum(data, length, 0));
- }
-
-mDNSlocal void SendNDP(mDNS *const m, const mDNSu8 op, const mDNSu8 flags, const AuthRecord *const rr,
- const mDNSv6Addr *const spa, const mDNSEthAddr *const tha, const mDNSv6Addr *const tpa, const mDNSEthAddr *const dst)
- {
- int i;
- mDNSOpaque16 checksum;
- mDNSu8 *ptr = m->omsg.data;
- // Some recipient hosts seem to ignore Neighbor Solicitations if the IPv6-layer destination address is not the
- // appropriate IPv6 solicited node multicast address, so we use that IPv6-layer destination address, even though
- // at the Ethernet-layer we unicast the packet to the intended target, to avoid wasting network bandwidth.
- const mDNSv6Addr mc = { { 0xFF,0x02,0x00,0x00, 0,0,0,0, 0,0,0,1, 0xFF,tpa->b[0xD],tpa->b[0xE],tpa->b[0xF] } };
- const mDNSv6Addr *const v6dst = (op == NDP_Sol) ? &mc : tpa;
- NetworkInterfaceInfo *intf = FirstInterfaceForID(m, rr->resrec.InterfaceID);
- if (!intf) { LogMsg("SendNDP: No interface with InterfaceID %p found %s", rr->resrec.InterfaceID, ARDisplayString(m,rr)); return; }
-
- // 0x00 Destination address
- for (i=0; i<6; i++) *ptr++ = dst->b[i];
- // Right now we only send Neighbor Solicitations to verify whether the host we're proxying for has gone to sleep yet.
- // Since we know who we're looking for, we send it via Ethernet-layer unicast, rather than bothering every host on the
- // link with a pointless link-layer multicast.
- // Should we want to send traditional Neighbor Solicitations in the future, where we really don't know in advance what
- // Ethernet-layer address we're looking for, we'll need to send to the appropriate Ethernet-layer multicast address:
- // *ptr++ = 0x33;
- // *ptr++ = 0x33;
- // *ptr++ = 0xFF;
- // *ptr++ = tpa->b[0xD];
- // *ptr++ = tpa->b[0xE];
- // *ptr++ = tpa->b[0xF];
-
- // 0x06 Source address (Note: Since we don't currently set the BIOCSHDRCMPLT option, BPF will fill in the real interface address for us)
- for (i=0; i<6; i++) *ptr++ = (tha ? *tha : intf->MAC).b[i];
-
- // 0x0C IPv6 Ethertype (0x86DD)
- *ptr++ = 0x86; *ptr++ = 0xDD;
-
- // 0x0E IPv6 header
- *ptr++ = 0x60; *ptr++ = 0x00; *ptr++ = 0x00; *ptr++ = 0x00; // Version, Traffic Class, Flow Label
- *ptr++ = 0x00; *ptr++ = 0x20; // Length
- *ptr++ = 0x3A; // Protocol == ICMPv6
- *ptr++ = 0xFF; // Hop Limit
-
- // 0x16 Sender IPv6 address
- for (i=0; i<16; i++) *ptr++ = spa->b[i];
-
- // 0x26 Destination IPv6 address
- for (i=0; i<16; i++) *ptr++ = v6dst->b[i];
-
- // 0x36 NDP header
- *ptr++ = op; // 0x87 == Neighbor Solicitation, 0x88 == Neighbor Advertisement
- *ptr++ = 0x00; // Code
- *ptr++ = 0x00; *ptr++ = 0x00; // Checksum placeholder (0x38, 0x39)
- *ptr++ = flags;
- *ptr++ = 0x00; *ptr++ = 0x00; *ptr++ = 0x00;
-
- if (op == NDP_Sol) // Neighbor Solicitation. The NDP "target" is the address we seek.
- {
- // 0x3E NDP target.
- for (i=0; i<16; i++) *ptr++ = tpa->b[i];
- // 0x4E Source Link-layer Address
- // <http://www.ietf.org/rfc/rfc2461.txt>
- // MUST NOT be included when the source IP address is the unspecified address.
- // Otherwise, on link layers that have addresses this option MUST be included
- // in multicast solicitations and SHOULD be included in unicast solicitations.
- if (!mDNSIPv6AddressIsZero(*spa))
- {
- *ptr++ = NDP_SrcLL; // Option Type 1 == Source Link-layer Address
- *ptr++ = 0x01; // Option length 1 (in units of 8 octets)
- for (i=0; i<6; i++) *ptr++ = (tha ? *tha : intf->MAC).b[i];
- }
- }
- else // Neighbor Advertisement. The NDP "target" is the address we're giving information about.
- {
- // 0x3E NDP target.
- for (i=0; i<16; i++) *ptr++ = spa->b[i];
- // 0x4E Target Link-layer Address
- *ptr++ = NDP_TgtLL; // Option Type 2 == Target Link-layer Address
- *ptr++ = 0x01; // Option length 1 (in units of 8 octets)
- for (i=0; i<6; i++) *ptr++ = (tha ? *tha : intf->MAC).b[i];
- }
-
- // 0x4E or 0x56 Total NDP Packet length 78 or 86 bytes
- m->omsg.data[0x13] = ptr - &m->omsg.data[0x36]; // Compute actual length
- checksum.NotAnInteger = ~IPv6CheckSum(spa, v6dst, 0x3A, &m->omsg.data[0x36], m->omsg.data[0x13]);
- m->omsg.data[0x38] = checksum.b[0];
- m->omsg.data[0x39] = checksum.b[1];
-
- mDNSPlatformSendRawPacket(m->omsg.data, ptr, rr->resrec.InterfaceID);
- }
-
-mDNSlocal void SetupOwnerOpt(const mDNS *const m, const NetworkInterfaceInfo *const intf, rdataOPT *const owner)
- {
- owner->u.owner.vers = 0;
- owner->u.owner.seq = m->SleepSeqNum;
- owner->u.owner.HMAC = m->PrimaryMAC;
- owner->u.owner.IMAC = intf->MAC;
- owner->u.owner.password = zeroEthAddr;
-
- // Don't try to compute the optlen until *after* we've set up the data fields
- // Right now the DNSOpt_Owner_Space macro does not depend on the owner->u.owner being set up correctly, but in the future it might
- owner->opt = kDNSOpt_Owner;
- owner->optlen = DNSOpt_Owner_Space(&m->PrimaryMAC, &intf->MAC) - 4;
- }
-
-mDNSlocal void GrantUpdateCredit(AuthRecord *rr)
- {
- if (++rr->UpdateCredits >= kMaxUpdateCredits) rr->NextUpdateCredit = 0;
- else rr->NextUpdateCredit = NonZeroTime(rr->NextUpdateCredit + kUpdateCreditRefreshInterval);
- }
-
-// Note about acceleration of announcements to facilitate automatic coalescing of
-// multiple independent threads of announcements into a single synchronized thread:
-// The announcements in the packet may be at different stages of maturity;
-// One-second interval, two-second interval, four-second interval, and so on.
-// After we've put in all the announcements that are due, we then consider
-// whether there are other nearly-due announcements that are worth accelerating.
-// To be eligible for acceleration, a record MUST NOT be older (further along
-// its timeline) than the most mature record we've already put in the packet.
-// In other words, younger records can have their timelines accelerated to catch up
-// with their elder bretheren; this narrows the age gap and helps them eventually get in sync.
-// Older records cannot have their timelines accelerated; this would just widen
-// the gap between them and their younger bretheren and get them even more out of sync.
-
-// Note: SendResponses calls mDNS_Deregister_internal which can call a user callback, which may change
-// the record list and/or question list.
-// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this.
-mDNSlocal void SendResponses(mDNS *const m)
- {
- int pktcount = 0;
- AuthRecord *rr, *r2;
- mDNSs32 maxExistingAnnounceInterval = 0;
- const NetworkInterfaceInfo *intf = GetFirstActiveInterface(m->HostInterfaces);
-
- m->NextScheduledResponse = m->timenow + 0x78000000;
-
- if (m->SleepState == SleepState_Transferring) RetrySPSRegistrations(m);
-
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- if (rr->ImmedUnicast)
- {
- mDNSAddr v4 = { mDNSAddrType_IPv4, {{{0}}} };
- mDNSAddr v6 = { mDNSAddrType_IPv6, {{{0}}} };
- v4.ip.v4 = rr->v4Requester;
- v6.ip.v6 = rr->v6Requester;
- if (!mDNSIPv4AddressIsZero(rr->v4Requester)) SendDelayedUnicastResponse(m, &v4, rr->ImmedAnswer);
- if (!mDNSIPv6AddressIsZero(rr->v6Requester)) SendDelayedUnicastResponse(m, &v6, rr->ImmedAnswer);
- if (rr->ImmedUnicast)
- {
- LogMsg("SendResponses: ERROR: rr->ImmedUnicast still set: %s", ARDisplayString(m, rr));
- rr->ImmedUnicast = mDNSfalse;
- }
- }
-
- // ***
- // *** 1. Setup: Set the SendRNow and ImmedAnswer fields to indicate which interface(s) the records need to be sent on
- // ***
-
- // Run through our list of records, and decide which ones we're going to announce on all interfaces
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- {
- while (rr->NextUpdateCredit && m->timenow - rr->NextUpdateCredit >= 0) GrantUpdateCredit(rr);
- if (TimeToAnnounceThisRecord(rr, m->timenow))
- {
- if (rr->resrec.RecordType == kDNSRecordTypeDeregistering)
- {
- if (!rr->WakeUp.HMAC.l[0])
- {
- if (rr->AnnounceCount) rr->ImmedAnswer = mDNSInterfaceMark; // Send goodbye packet on all interfaces
- }
- else
- {
- LogSPS("SendResponses: Sending wakeup %2d for %.6a %s", rr->AnnounceCount-3, &rr->WakeUp.IMAC, ARDisplayString(m, rr));
- SendWakeup(m, rr->resrec.InterfaceID, &rr->WakeUp.IMAC, &rr->WakeUp.password);
- for (r2 = rr; r2; r2=r2->next)
- if (r2->AnnounceCount && r2->resrec.InterfaceID == rr->resrec.InterfaceID && mDNSSameEthAddress(&r2->WakeUp.IMAC, &rr->WakeUp.IMAC))
- {
- // For now we only want to send a single Unsolicited Neighbor Advertisement restoring the address to the original
- // owner, because these packets can cause some IPv6 stacks to falsely conclude that there's an address conflict.
- if (r2->AddressProxy.type == mDNSAddrType_IPv6 && r2->AnnounceCount == WakeupCount)
- {
- LogSPS("NDP Announcement %2d Releasing traffic for H-MAC %.6a I-MAC %.6a %s",
- r2->AnnounceCount-3, &r2->WakeUp.HMAC, &r2->WakeUp.IMAC, ARDisplayString(m,r2));
- SendNDP(m, NDP_Adv, NDP_Override, r2, &r2->AddressProxy.ip.v6, &r2->WakeUp.IMAC, &AllHosts_v6, &AllHosts_v6_Eth);
- }
- r2->LastAPTime = m->timenow;
- // After 15 wakeups without success (maybe host has left the network) send three goodbyes instead
- if (--r2->AnnounceCount <= GoodbyeCount) r2->WakeUp.HMAC = zeroEthAddr;
- }
- }
- }
- else if (ResourceRecordIsValidAnswer(rr))
- {
- if (rr->AddressProxy.type)
- {
- rr->AnnounceCount--;
- rr->ThisAPInterval *= 2;
- rr->LastAPTime = m->timenow;
- if (rr->AddressProxy.type == mDNSAddrType_IPv4)
- {
- LogSPS("ARP Announcement %2d Capturing traffic for H-MAC %.6a I-MAC %.6a %s",
- rr->AnnounceCount, &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, ARDisplayString(m,rr));
- SendARP(m, 1, rr, &rr->AddressProxy.ip.v4, &zeroEthAddr, &rr->AddressProxy.ip.v4, &onesEthAddr);
- }
- else if (rr->AddressProxy.type == mDNSAddrType_IPv6)
- {
- LogSPS("NDP Announcement %2d Capturing traffic for H-MAC %.6a I-MAC %.6a %s",
- rr->AnnounceCount, &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, ARDisplayString(m,rr));
- SendNDP(m, NDP_Adv, NDP_Override, rr, &rr->AddressProxy.ip.v6, mDNSNULL, &AllHosts_v6, &AllHosts_v6_Eth);
- }
- }
- else
- {
- rr->ImmedAnswer = mDNSInterfaceMark; // Send on all interfaces
- if (maxExistingAnnounceInterval < rr->ThisAPInterval)
- maxExistingAnnounceInterval = rr->ThisAPInterval;
- if (rr->UpdateBlocked) rr->UpdateBlocked = 0;
- }
- }
- }
- }
-
- // Any interface-specific records we're going to send are marked as being sent on all appropriate interfaces (which is just one)
- // Eligible records that are more than half-way to their announcement time are accelerated
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- if ((rr->resrec.InterfaceID && rr->ImmedAnswer) ||
- (rr->ThisAPInterval <= maxExistingAnnounceInterval &&
- TimeToAnnounceThisRecord(rr, m->timenow + rr->ThisAPInterval/2) &&
- !rr->AddressProxy.type && // Don't include ARP Annoucements when considering which records to accelerate
- ResourceRecordIsValidAnswer(rr)))
- rr->ImmedAnswer = mDNSInterfaceMark; // Send on all interfaces
-
- // When sending SRV records (particularly when announcing a new service) automatically add related Address record(s) as additionals
- // Note: Currently all address records are interface-specific, so it's safe to set ImmedAdditional to their InterfaceID,
- // which will be non-null. If by some chance there is an address record that's not interface-specific (should never happen)
- // then all that means is that it won't get sent -- which would not be the end of the world.
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- {
- if (rr->ImmedAnswer && rr->resrec.rrtype == kDNSType_SRV)
- for (r2=m->ResourceRecords; r2; r2=r2->next) // Scan list of resource records
- if (RRTypeIsAddressType(r2->resrec.rrtype) && // For all address records (A/AAAA) ...
- ResourceRecordIsValidAnswer(r2) && // ... which are valid for answer ...
- rr->LastMCTime - r2->LastMCTime >= 0 && // ... which we have not sent recently ...
- rr->resrec.rdatahash == r2->resrec.namehash && // ... whose name is the name of the SRV target
- SameDomainName(&rr->resrec.rdata->u.srv.target, r2->resrec.name) &&
- (rr->ImmedAnswer == mDNSInterfaceMark || rr->ImmedAnswer == r2->resrec.InterfaceID))
- r2->ImmedAdditional = r2->resrec.InterfaceID; // ... then mark this address record for sending too
- // We also make sure we send the DeviceInfo TXT record too, if necessary
- // We check for RecordType == kDNSRecordTypeShared because we don't want to tag the
- // DeviceInfo TXT record onto a goodbye packet (RecordType == kDNSRecordTypeDeregistering).
- if (rr->ImmedAnswer && rr->resrec.RecordType == kDNSRecordTypeShared && rr->resrec.rrtype == kDNSType_PTR)
- if (ResourceRecordIsValidAnswer(&m->DeviceInfo) && SameDomainLabel(rr->resrec.rdata->u.name.c, m->DeviceInfo.resrec.name->c))
- {
- if (!m->DeviceInfo.ImmedAnswer) m->DeviceInfo.ImmedAnswer = rr->ImmedAnswer;
- else m->DeviceInfo.ImmedAnswer = mDNSInterfaceMark;
- }
- }
-
- // If there's a record which is supposed to be unique that we're going to send, then make sure that we give
- // the whole RRSet as an atomic unit. That means that if we have any other records with the same name/type/class
- // then we need to mark them for sending too. Otherwise, if we set the kDNSClass_UniqueRRSet bit on a
- // record, then other RRSet members that have not been sent recently will get flushed out of client caches.
- // -- If a record is marked to be sent on a certain interface, make sure the whole set is marked to be sent on that interface
- // -- If any record is marked to be sent on all interfaces, make sure the whole set is marked to be sent on all interfaces
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- if (rr->resrec.RecordType & kDNSRecordTypeUniqueMask)
- {
- if (rr->ImmedAnswer) // If we're sending this as answer, see that its whole RRSet is similarly marked
- {
- for (r2 = m->ResourceRecords; r2; r2=r2->next)
- if (ResourceRecordIsValidAnswer(r2))
- if (r2->ImmedAnswer != mDNSInterfaceMark &&
- r2->ImmedAnswer != rr->ImmedAnswer && SameResourceRecordSignature(r2, rr))
- r2->ImmedAnswer = !r2->ImmedAnswer ? rr->ImmedAnswer : mDNSInterfaceMark;
- }
- else if (rr->ImmedAdditional) // If we're sending this as additional, see that its whole RRSet is similarly marked
- {
- for (r2 = m->ResourceRecords; r2; r2=r2->next)
- if (ResourceRecordIsValidAnswer(r2))
- if (r2->ImmedAdditional != rr->ImmedAdditional && SameResourceRecordSignature(r2, rr))
- r2->ImmedAdditional = rr->ImmedAdditional;
- }
- }
-
- // Now set SendRNow state appropriately
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- {
- if (rr->ImmedAnswer == mDNSInterfaceMark) // Sending this record on all appropriate interfaces
- {
- rr->SendRNow = !intf ? mDNSNULL : (rr->resrec.InterfaceID) ? rr->resrec.InterfaceID : intf->InterfaceID;
- rr->ImmedAdditional = mDNSNULL; // No need to send as additional if sending as answer
- rr->LastMCTime = m->timenow;
- rr->LastMCInterface = rr->ImmedAnswer;
- // If we're announcing this record, and it's at least half-way to its ordained time, then consider this announcement done
- if (TimeToAnnounceThisRecord(rr, m->timenow + rr->ThisAPInterval/2))
- {
- rr->AnnounceCount--;
- if (rr->resrec.RecordType != kDNSRecordTypeDeregistering)
- rr->ThisAPInterval *= 2;
- rr->LastAPTime = m->timenow;
- debugf("Announcing %##s (%s) %d", rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype), rr->AnnounceCount);
- }
- }
- else if (rr->ImmedAnswer) // Else, just respond to a single query on single interface:
- {
- rr->SendRNow = rr->ImmedAnswer; // Just respond on that interface
- rr->ImmedAdditional = mDNSNULL; // No need to send as additional too
- rr->LastMCTime = m->timenow;
- rr->LastMCInterface = rr->ImmedAnswer;
- }
- SetNextAnnounceProbeTime(m, rr);
- //if (rr->SendRNow) LogMsg("%-15.4a %s", &rr->v4Requester, ARDisplayString(m, rr));
- }
-
- // ***
- // *** 2. Loop through interface list, sending records as appropriate
- // ***
-
- while (intf)
- {
- const int OwnerRecordSpace = (m->AnnounceOwner && intf->MAC.l[0]) ? DNSOpt_Header_Space + DNSOpt_Owner_Space(&m->PrimaryMAC, &intf->MAC) : 0;
- int numDereg = 0;
- int numAnnounce = 0;
- int numAnswer = 0;
- mDNSu8 *responseptr = m->omsg.data;
- mDNSu8 *newptr;
- InitializeDNSMessage(&m->omsg.h, zeroID, ResponseFlags);
-
- // First Pass. Look for:
- // 1. Deregistering records that need to send their goodbye packet
- // 2. Updated records that need to retract their old data
- // 3. Answers and announcements we need to send
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- {
-
- // Skip this interface if the record InterfaceID is *Any and the record is not
- // appropriate for the interface type.
- if ((rr->SendRNow == intf->InterfaceID) &&
- ((rr->resrec.InterfaceID == mDNSInterface_Any) && !mDNSPlatformValidRecordForInterface(rr, intf)))
- {
- LogInfo("SendResponses: Not Sending %s, on %s", ARDisplayString(m, rr), InterfaceNameForID(m, rr->SendRNow));
- rr->SendRNow = GetNextActiveInterfaceID(intf);
- }
- else if (rr->SendRNow == intf->InterfaceID)
- {
- RData *OldRData = rr->resrec.rdata;
- mDNSu16 oldrdlength = rr->resrec.rdlength;
- mDNSu8 active = (mDNSu8)
- (rr->resrec.RecordType != kDNSRecordTypeDeregistering &&
- (m->SleepState != SleepState_Sleeping || intf->SPSAddr[0].type || intf->SPSAddr[1].type || intf->SPSAddr[2].type));
- newptr = mDNSNULL;
- if (rr->NewRData && active)
- {
- // See if we should send a courtesy "goodbye" for the old data before we replace it.
- if (ResourceRecordIsValidAnswer(rr) && rr->resrec.RecordType == kDNSRecordTypeShared && rr->RequireGoodbye)
- {
- newptr = PutRR_OS_TTL(responseptr, &m->omsg.h.numAnswers, &rr->resrec, 0);
- if (newptr) { responseptr = newptr; numDereg++; rr->RequireGoodbye = mDNSfalse; }
- else continue; // If this packet is already too full to hold the goodbye for this record, skip it for now and we'll retry later
- }
- SetNewRData(&rr->resrec, rr->NewRData, rr->newrdlength);
- }
-
- if (rr->resrec.RecordType & kDNSRecordTypeUniqueMask)
- rr->resrec.rrclass |= kDNSClass_UniqueRRSet; // Temporarily set the cache flush bit so PutResourceRecord will set it
- newptr = PutRR_OS_TTL(responseptr, &m->omsg.h.numAnswers, &rr->resrec, active ? rr->resrec.rroriginalttl : 0);
- rr->resrec.rrclass &= ~kDNSClass_UniqueRRSet; // Make sure to clear cache flush bit back to normal state
- if (newptr)
- {
- responseptr = newptr;
- rr->RequireGoodbye = active;
- if (rr->resrec.RecordType == kDNSRecordTypeDeregistering) numDereg++;
- else if (rr->LastAPTime == m->timenow) numAnnounce++; else numAnswer++;
- }
-
- if (rr->NewRData && active)
- SetNewRData(&rr->resrec, OldRData, oldrdlength);
-
- // The first time through (pktcount==0), if this record is verified unique
- // (i.e. typically A, AAAA, SRV, TXT and reverse-mapping PTR), set the flag to add an NSEC too.
- if (!pktcount && active && (rr->resrec.RecordType & kDNSRecordTypeActiveUniqueMask) && !rr->SendNSECNow)
- rr->SendNSECNow = mDNSInterfaceMark;
-
- if (newptr) // If succeeded in sending, advance to next interface
- {
- // If sending on all interfaces, go to next interface; else we're finished now
- if (rr->ImmedAnswer == mDNSInterfaceMark && rr->resrec.InterfaceID == mDNSInterface_Any)
- rr->SendRNow = GetNextActiveInterfaceID(intf);
- else
- rr->SendRNow = mDNSNULL;
- }
- }
- }
-
- // Second Pass. Add additional records, if there's space.
- newptr = responseptr;
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- if (rr->ImmedAdditional == intf->InterfaceID)
- if (ResourceRecordIsValidAnswer(rr))
- {
- // If we have at least one answer already in the packet, then plan to add additionals too
- mDNSBool SendAdditional = (m->omsg.h.numAnswers > 0);
-
- // If we're not planning to send any additionals, but this record is a unique one, then
- // make sure we haven't already sent any other members of its RRSet -- if we have, then they
- // will have had the cache flush bit set, so now we need to finish the job and send the rest.
- if (!SendAdditional && (rr->resrec.RecordType & kDNSRecordTypeUniqueMask))
- {
- const AuthRecord *a;
- for (a = m->ResourceRecords; a; a=a->next)
- if (a->LastMCTime == m->timenow &&
- a->LastMCInterface == intf->InterfaceID &&
- SameResourceRecordSignature(a, rr)) { SendAdditional = mDNStrue; break; }
- }
- if (!SendAdditional) // If we don't want to send this after all,
- rr->ImmedAdditional = mDNSNULL; // then cancel its ImmedAdditional field
- else if (newptr) // Else, try to add it if we can
- {
- // The first time through (pktcount==0), if this record is verified unique
- // (i.e. typically A, AAAA, SRV, TXT and reverse-mapping PTR), set the flag to add an NSEC too.
- if (!pktcount && (rr->resrec.RecordType & kDNSRecordTypeActiveUniqueMask) && !rr->SendNSECNow)
- rr->SendNSECNow = mDNSInterfaceMark;
-
- if (rr->resrec.RecordType & kDNSRecordTypeUniqueMask)
- rr->resrec.rrclass |= kDNSClass_UniqueRRSet; // Temporarily set the cache flush bit so PutResourceRecord will set it
- newptr = PutRR_OS(newptr, &m->omsg.h.numAdditionals, &rr->resrec);
- rr->resrec.rrclass &= ~kDNSClass_UniqueRRSet; // Make sure to clear cache flush bit back to normal state
- if (newptr)
- {
- responseptr = newptr;
- rr->ImmedAdditional = mDNSNULL;
- rr->RequireGoodbye = mDNStrue;
- // If we successfully put this additional record in the packet, we record LastMCTime & LastMCInterface.
- // This matters particularly in the case where we have more than one IPv6 (or IPv4) address, because otherwise,
- // when we see our own multicast with the cache flush bit set, if we haven't set LastMCTime, then we'll get
- // all concerned and re-announce our record again to make sure it doesn't get flushed from peer caches.
- rr->LastMCTime = m->timenow;
- rr->LastMCInterface = intf->InterfaceID;
- }
- }
- }
-
- // Third Pass. Add NSEC records, if there's space.
- // When we're generating an NSEC record in response to a specify query for that type
- // (recognized by rr->SendNSECNow == intf->InterfaceID) we should really put the NSEC in the Answer Section,
- // not Additional Section, but for now it's easier to handle both cases in this Additional Section loop here.
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- if (rr->SendNSECNow == mDNSInterfaceMark || rr->SendNSECNow == intf->InterfaceID)
- {
- AuthRecord nsec;
- mDNS_SetupResourceRecord(&nsec, mDNSNULL, mDNSInterface_Any, kDNSType_NSEC, rr->resrec.rroriginalttl, kDNSRecordTypeUnique, AuthRecordAny, mDNSNULL, mDNSNULL);
- nsec.resrec.rrclass |= kDNSClass_UniqueRRSet;
- AssignDomainName(&nsec.namestorage, rr->resrec.name);
- mDNSPlatformMemZero(nsec.rdatastorage.u.nsec.bitmap, sizeof(nsec.rdatastorage.u.nsec.bitmap));
- for (r2 = m->ResourceRecords; r2; r2=r2->next)
- if (ResourceRecordIsValidAnswer(r2) && SameResourceRecordNameClassInterface(r2, rr))
- {
- if (r2->resrec.rrtype >= kDNSQType_ANY) { LogMsg("Can't create NSEC for record %s", ARDisplayString(m, r2)); break; }
- else nsec.rdatastorage.u.nsec.bitmap[r2->resrec.rrtype >> 3] |= 128 >> (r2->resrec.rrtype & 7);
- }
- newptr = responseptr;
- if (!r2) // If we successfully built our NSEC record, add it to the packet now
- {
- newptr = PutRR_OS(responseptr, &m->omsg.h.numAdditionals, &nsec.resrec);
- if (newptr) responseptr = newptr;
- }
-
- // If we successfully put the NSEC record, clear the SendNSECNow flag
- // If we consider this NSEC optional, then we unconditionally clear the SendNSECNow flag, even if we fail to put this additional record
- if (newptr || rr->SendNSECNow == mDNSInterfaceMark)
- {
- rr->SendNSECNow = mDNSNULL;
- // Run through remainder of list clearing SendNSECNow flag for all other records which would generate the same NSEC
- for (r2 = rr->next; r2; r2=r2->next)
- if (SameResourceRecordNameClassInterface(r2, rr))
- if (r2->SendNSECNow == mDNSInterfaceMark || r2->SendNSECNow == intf->InterfaceID)
- r2->SendNSECNow = mDNSNULL;
- }
- }
-
- if (m->omsg.h.numAnswers || m->omsg.h.numAdditionals)
- {
- // If we have data to send, add OWNER option if necessary, then send packet
-
- if (OwnerRecordSpace)
- {
- AuthRecord opt;
- mDNS_SetupResourceRecord(&opt, mDNSNULL, mDNSInterface_Any, kDNSType_OPT, kStandardTTL, kDNSRecordTypeKnownUnique, AuthRecordAny, mDNSNULL, mDNSNULL);
- opt.resrec.rrclass = NormalMaxDNSMessageData;
- opt.resrec.rdlength = sizeof(rdataOPT); // One option in this OPT record
- opt.resrec.rdestimate = sizeof(rdataOPT);
- SetupOwnerOpt(m, intf, &opt.resrec.rdata->u.opt[0]);
- newptr = PutResourceRecord(&m->omsg, responseptr, &m->omsg.h.numAdditionals, &opt.resrec);
- if (newptr) { responseptr = newptr; LogSPS("SendResponses put %s", ARDisplayString(m, &opt)); }
- else if (m->omsg.h.numAnswers + m->omsg.h.numAuthorities + m->omsg.h.numAdditionals == 1)
- LogSPS("SendResponses: No space in packet for Owner OPT record (%d/%d/%d/%d) %s",
- m->omsg.h.numQuestions, m->omsg.h.numAnswers, m->omsg.h.numAuthorities, m->omsg.h.numAdditionals, ARDisplayString(m, &opt));
- else
- LogMsg("SendResponses: How did we fail to have space for Owner OPT record (%d/%d/%d/%d) %s",
- m->omsg.h.numQuestions, m->omsg.h.numAnswers, m->omsg.h.numAuthorities, m->omsg.h.numAdditionals, ARDisplayString(m, &opt));
- }
-
- debugf("SendResponses: Sending %d Deregistration%s, %d Announcement%s, %d Answer%s, %d Additional%s on %p",
- numDereg, numDereg == 1 ? "" : "s",
- numAnnounce, numAnnounce == 1 ? "" : "s",
- numAnswer, numAnswer == 1 ? "" : "s",
- m->omsg.h.numAdditionals, m->omsg.h.numAdditionals == 1 ? "" : "s", intf->InterfaceID);
-
- if (intf->IPv4Available) mDNSSendDNSMessage(m, &m->omsg, responseptr, intf->InterfaceID, mDNSNULL, &AllDNSLinkGroup_v4, MulticastDNSPort, mDNSNULL, mDNSNULL);
- if (intf->IPv6Available) mDNSSendDNSMessage(m, &m->omsg, responseptr, intf->InterfaceID, mDNSNULL, &AllDNSLinkGroup_v6, MulticastDNSPort, mDNSNULL, mDNSNULL);
- if (!m->SuppressSending) m->SuppressSending = NonZeroTime(m->timenow + (mDNSPlatformOneSecond+9)/10);
- if (++pktcount >= 1000) { LogMsg("SendResponses exceeded loop limit %d: giving up", pktcount); break; }
- // There might be more things to send on this interface, so go around one more time and try again.
- }
- else // Nothing more to send on this interface; go to next
- {
- const NetworkInterfaceInfo *next = GetFirstActiveInterface(intf->next);
- #if MDNS_DEBUGMSGS && 0
- const char *const msg = next ? "SendResponses: Nothing more on %p; moving to %p" : "SendResponses: Nothing more on %p";
- debugf(msg, intf, next);
- #endif
- intf = next;
- pktcount = 0; // When we move to a new interface, reset packet count back to zero -- NSEC generation logic uses it
- }
- }
-
- // ***
- // *** 3. Cleanup: Now that everything is sent, call client callback functions, and reset state variables
- // ***
-
- if (m->CurrentRecord)
- LogMsg("SendResponses ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord));
- m->CurrentRecord = m->ResourceRecords;
- while (m->CurrentRecord)
- {
- rr = m->CurrentRecord;
- m->CurrentRecord = rr->next;
-
- if (rr->SendRNow)
- {
- if (rr->ARType != AuthRecordLocalOnly && rr->ARType != AuthRecordP2P)
- LogMsg("SendResponses: No active interface %p to send: %p %02X %s", rr->SendRNow, rr->resrec.InterfaceID, rr->resrec.RecordType, ARDisplayString(m, rr));
- rr->SendRNow = mDNSNULL;
- }
-
- if (rr->ImmedAnswer || rr->resrec.RecordType == kDNSRecordTypeDeregistering)
- {
- if (rr->NewRData) CompleteRDataUpdate(m, rr); // Update our rdata, clear the NewRData pointer, and return memory to the client
-
- if (rr->resrec.RecordType == kDNSRecordTypeDeregistering && rr->AnnounceCount == 0)
- {
- // For Unicast, when we get the response from the server, we will call CompleteDeregistration
- if (!AuthRecord_uDNS(rr)) CompleteDeregistration(m, rr); // Don't touch rr after this
- }
- else
- {
- rr->ImmedAnswer = mDNSNULL;
- rr->ImmedUnicast = mDNSfalse;
- rr->v4Requester = zerov4Addr;
- rr->v6Requester = zerov6Addr;
- }
- }
- }
- verbosedebugf("SendResponses: Next in %ld ticks", m->NextScheduledResponse - m->timenow);
- }
-
-// Calling CheckCacheExpiration() is an expensive operation because it has to look at the entire cache,
-// so we want to be lazy about how frequently we do it.
-// 1. If a cache record is currently referenced by *no* active questions,
-// then we don't mind expiring it up to a minute late (who will know?)
-// 2. Else, if a cache record is due for some of its final expiration queries,
-// we'll allow them to be late by up to 2% of the TTL
-// 3. Else, if a cache record has completed all its final expiration queries without success,
-// and is expiring, and had an original TTL more than ten seconds, we'll allow it to be one second late
-// 4. Else, it is expiring and had an original TTL of ten seconds or less (includes explicit goodbye packets),
-// so allow at most 1/10 second lateness
-// 5. For records with rroriginalttl set to zero, that means we really want to delete them immediately
-// (we have a new record with DelayDelivery set, waiting for the old record to go away before we can notify clients).
-#define CacheCheckGracePeriod(RR) ( \
- ((RR)->CRActiveQuestion == mDNSNULL ) ? (60 * mDNSPlatformOneSecond) : \
- ((RR)->UnansweredQueries < MaxUnansweredQueries) ? (TicksTTL(rr)/50) : \
- ((RR)->resrec.rroriginalttl > 10 ) ? (mDNSPlatformOneSecond) : \
- ((RR)->resrec.rroriginalttl > 0 ) ? (mDNSPlatformOneSecond/10) : 0)
-
-#define NextCacheCheckEvent(RR) ((RR)->NextRequiredQuery + CacheCheckGracePeriod(RR))
-
-mDNSexport void ScheduleNextCacheCheckTime(mDNS *const m, const mDNSu32 slot, const mDNSs32 event)
- {
- if (m->rrcache_nextcheck[slot] - event > 0)
- m->rrcache_nextcheck[slot] = event;
- if (m->NextCacheCheck - event > 0)
- m->NextCacheCheck = event;
- }
-
-// Note: MUST call SetNextCacheCheckTimeForRecord any time we change:
-// rr->TimeRcvd
-// rr->resrec.rroriginalttl
-// rr->UnansweredQueries
-// rr->CRActiveQuestion
-mDNSlocal void SetNextCacheCheckTimeForRecord(mDNS *const m, CacheRecord *const rr)
- {
- rr->NextRequiredQuery = RRExpireTime(rr);
-
- // If we have an active question, then see if we want to schedule a refresher query for this record.
- // Usually we expect to do four queries, at 80-82%, 85-87%, 90-92% and then 95-97% of the TTL.
- if (rr->CRActiveQuestion && rr->UnansweredQueries < MaxUnansweredQueries)
- {
- rr->NextRequiredQuery -= TicksTTL(rr)/20 * (MaxUnansweredQueries - rr->UnansweredQueries);
- rr->NextRequiredQuery += mDNSRandom((mDNSu32)TicksTTL(rr)/50);
- verbosedebugf("SetNextCacheCheckTimeForRecord: NextRequiredQuery in %ld sec CacheCheckGracePeriod %d ticks for %s",
- (rr->NextRequiredQuery - m->timenow) / mDNSPlatformOneSecond, CacheCheckGracePeriod(rr), CRDisplayString(m,rr));
- }
-
- ScheduleNextCacheCheckTime(m, HashSlot(rr->resrec.name), NextCacheCheckEvent(rr));
- }
-
-#define kMinimumReconfirmTime ((mDNSu32)mDNSPlatformOneSecond * 5)
-#define kDefaultReconfirmTimeForWake ((mDNSu32)mDNSPlatformOneSecond * 5)
-#define kDefaultReconfirmTimeForNoAnswer ((mDNSu32)mDNSPlatformOneSecond * 5)
-#define kDefaultReconfirmTimeForFlappingInterface ((mDNSu32)mDNSPlatformOneSecond * 30)
-
-mDNSlocal mStatus mDNS_Reconfirm_internal(mDNS *const m, CacheRecord *const rr, mDNSu32 interval)
- {
- if (interval < kMinimumReconfirmTime)
- interval = kMinimumReconfirmTime;
- if (interval > 0x10000000) // Make sure interval doesn't overflow when we multiply by four below
- interval = 0x10000000;
-
- // If the expected expiration time for this record is more than interval+33%, then accelerate its expiration
- if (RRExpireTime(rr) - m->timenow > (mDNSs32)((interval * 4) / 3))
- {
- // Add a 33% random amount to the interval, to avoid synchronization between multiple hosts
- // For all the reconfirmations in a given batch, we want to use the same random value
- // so that the reconfirmation questions can be grouped into a single query packet
- if (!m->RandomReconfirmDelay) m->RandomReconfirmDelay = 1 + mDNSRandom(0x3FFFFFFF);
- interval += m->RandomReconfirmDelay % ((interval/3) + 1);
- rr->TimeRcvd = m->timenow - (mDNSs32)interval * 3;
- rr->resrec.rroriginalttl = (interval * 4 + mDNSPlatformOneSecond - 1) / mDNSPlatformOneSecond;
- SetNextCacheCheckTimeForRecord(m, rr);
- }
- debugf("mDNS_Reconfirm_internal:%6ld ticks to go for %s %p",
- RRExpireTime(rr) - m->timenow, CRDisplayString(m, rr), rr->CRActiveQuestion);
- return(mStatus_NoError);
- }
-
-#define MaxQuestionInterval (3600 * mDNSPlatformOneSecond)
-
-// BuildQuestion puts a question into a DNS Query packet and if successful, updates the value of queryptr.
-// It also appends to the list of known answer records that need to be included,
-// and updates the forcast for the size of the known answer section.
-mDNSlocal mDNSBool BuildQuestion(mDNS *const m, DNSMessage *query, mDNSu8 **queryptr, DNSQuestion *q,
- CacheRecord ***kalistptrptr, mDNSu32 *answerforecast)
- {
- mDNSBool ucast = (q->LargeAnswers || q->RequestUnicast) && m->CanReceiveUnicastOn5353;
- mDNSu16 ucbit = (mDNSu16)(ucast ? kDNSQClass_UnicastResponse : 0);
- const mDNSu8 *const limit = query->data + NormalMaxDNSMessageData;
- mDNSu8 *newptr = putQuestion(query, *queryptr, limit - *answerforecast, &q->qname, q->qtype, (mDNSu16)(q->qclass | ucbit));
- if (!newptr)
- {
- debugf("BuildQuestion: No more space in this packet for question %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- return(mDNSfalse);
- }
- else
- {
- mDNSu32 forecast = *answerforecast;
- const mDNSu32 slot = HashSlot(&q->qname);
- const CacheGroup *const cg = CacheGroupForName(m, slot, q->qnamehash, &q->qname);
- CacheRecord *rr;
- CacheRecord **ka = *kalistptrptr; // Make a working copy of the pointer we're going to update
-
- for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next) // If we have a resource record in our cache,
- if (rr->resrec.InterfaceID == q->SendQNow && // received on this interface
- !(rr->resrec.RecordType & kDNSRecordTypeUniqueMask) && // which is a shared (i.e. not unique) record type
- rr->NextInKAList == mDNSNULL && ka != &rr->NextInKAList && // which is not already in the known answer list
- rr->resrec.rdlength <= SmallRecordLimit && // which is small enough to sensibly fit in the packet
- SameNameRecordAnswersQuestion(&rr->resrec, q) && // which answers our question
- rr->TimeRcvd + TicksTTL(rr)/2 - m->timenow > // and its half-way-to-expiry time is at least 1 second away
- mDNSPlatformOneSecond) // (also ensures we never include goodbye records with TTL=1)
- {
- // We don't want to include unique records in the Known Answer section. The Known Answer section
- // is intended to suppress floods of shared-record replies from many other devices on the network.
- // That concept really does not apply to unique records, and indeed if we do send a query for
- // which we have a unique record already in our cache, then including that unique record as a
- // Known Answer, so as to suppress the only answer we were expecting to get, makes little sense.
-
- *ka = rr; // Link this record into our known answer chain
- ka = &rr->NextInKAList;
- // We forecast: compressed name (2) type (2) class (2) TTL (4) rdlength (2) rdata (n)
- forecast += 12 + rr->resrec.rdestimate;
- // If we're trying to put more than one question in this packet, and it doesn't fit
- // then undo that last question and try again next time
- if (query->h.numQuestions > 1 && newptr + forecast >= limit)
- {
- debugf("BuildQuestion: Retracting question %##s (%s) new forecast total %d",
- q->qname.c, DNSTypeName(q->qtype), newptr + forecast - query->data);
- query->h.numQuestions--;
- ka = *kalistptrptr; // Go back to where we started and retract these answer records
- while (*ka) { CacheRecord *c = *ka; *ka = mDNSNULL; ka = &c->NextInKAList; }
- return(mDNSfalse); // Return false, so we'll try again in the next packet
- }
- }
-
- // Success! Update our state pointers, increment UnansweredQueries as appropriate, and return
- *queryptr = newptr; // Update the packet pointer
- *answerforecast = forecast; // Update the forecast
- *kalistptrptr = ka; // Update the known answer list pointer
- if (ucast) q->ExpectUnicastResp = NonZeroTime(m->timenow);
-
- for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next) // For every resource record in our cache,
- if (rr->resrec.InterfaceID == q->SendQNow && // received on this interface
- rr->NextInKAList == mDNSNULL && ka != &rr->NextInKAList && // which is not in the known answer list
- SameNameRecordAnswersQuestion(&rr->resrec, q)) // which answers our question
- {
- rr->UnansweredQueries++; // indicate that we're expecting a response
- rr->LastUnansweredTime = m->timenow;
- SetNextCacheCheckTimeForRecord(m, rr);
- }
-
- return(mDNStrue);
- }
- }
-
-// When we have a query looking for a specified name, but there appear to be no answers with
-// that name, ReconfirmAntecedents() is called with depth=0 to start the reconfirmation process
-// for any records in our cache that reference the given name (e.g. PTR and SRV records).
-// For any such cache record we find, we also recursively call ReconfirmAntecedents() for *its* name.
-// We increment depth each time we recurse, to guard against possible infinite loops, with a limit of 5.
-// A typical reconfirmation scenario might go like this:
-// Depth 0: Name "myhost.local" has no address records
-// Depth 1: SRV "My Service._example._tcp.local." refers to "myhost.local"; may be stale
-// Depth 2: PTR "_example._tcp.local." refers to "My Service"; may be stale
-// Depth 3: PTR "_services._dns-sd._udp.local." refers to "_example._tcp.local."; may be stale
-// Currently depths 4 and 5 are not expected to occur; if we did get to depth 5 we'd reconfim any records we
-// found referring to the given name, but not recursively descend any further reconfirm *their* antecedents.
-mDNSlocal void ReconfirmAntecedents(mDNS *const m, const domainname *const name, const mDNSu32 namehash, const int depth)
- {
- mDNSu32 slot;
- CacheGroup *cg;
- CacheRecord *cr;
- debugf("ReconfirmAntecedents (depth=%d) for %##s", depth, name->c);
- FORALL_CACHERECORDS(slot, cg, cr)
- {
- domainname *crtarget = GetRRDomainNameTarget(&cr->resrec);
- if (crtarget && cr->resrec.rdatahash == namehash && SameDomainName(crtarget, name))
- {
- LogInfo("ReconfirmAntecedents: Reconfirming (depth=%d) %s", depth, CRDisplayString(m, cr));
- mDNS_Reconfirm_internal(m, cr, kDefaultReconfirmTimeForNoAnswer);
- if (depth < 5) ReconfirmAntecedents(m, cr->resrec.name, cr->resrec.namehash, depth+1);
- }
- }
- }
-
-// If we get no answer for a AAAA query, then before doing an automatic implicit ReconfirmAntecedents
-// we check if we have an address record for the same name. If we do have an IPv4 address for a given
-// name but not an IPv6 address, that's okay (it just means the device doesn't do IPv6) so the failure
-// to get a AAAA response is not grounds to doubt the PTR/SRV chain that lead us to that name.
-mDNSlocal const CacheRecord *CacheHasAddressTypeForName(mDNS *const m, const domainname *const name, const mDNSu32 namehash)
- {
- CacheGroup *const cg = CacheGroupForName(m, HashSlot(name), namehash, name);
- const CacheRecord *cr = cg ? cg->members : mDNSNULL;
- while (cr && !RRTypeIsAddressType(cr->resrec.rrtype)) cr=cr->next;
- return(cr);
- }
-
-mDNSlocal const CacheRecord *FindSPSInCache1(mDNS *const m, const DNSQuestion *const q, const CacheRecord *const c0, const CacheRecord *const c1)
- {
- CacheGroup *const cg = CacheGroupForName(m, HashSlot(&q->qname), q->qnamehash, &q->qname);
- const CacheRecord *cr, *bestcr = mDNSNULL;
- mDNSu32 bestmetric = 1000000;
- for (cr = cg ? cg->members : mDNSNULL; cr; cr=cr->next)
- if (cr->resrec.rrtype == kDNSType_PTR && cr->resrec.rdlength >= 6) // If record is PTR type, with long enough name,
- if (cr != c0 && cr != c1) // that's not one we've seen before,
- if (SameNameRecordAnswersQuestion(&cr->resrec, q)) // and answers our browse query,
- if (!IdenticalSameNameRecord(&cr->resrec, &m->SPSRecords.RR_PTR.resrec)) // and is not our own advertised service...
- {
- mDNSu32 metric = SPSMetric(cr->resrec.rdata->u.name.c);
- if (bestmetric > metric) { bestmetric = metric; bestcr = cr; }
- }
- return(bestcr);
- }
-
-// Finds the three best Sleep Proxies we currently have in our cache
-mDNSexport void FindSPSInCache(mDNS *const m, const DNSQuestion *const q, const CacheRecord *sps[3])
- {
- sps[0] = FindSPSInCache1(m, q, mDNSNULL, mDNSNULL);
- sps[1] = !sps[0] ? mDNSNULL : FindSPSInCache1(m, q, sps[0], mDNSNULL);
- sps[2] = !sps[1] ? mDNSNULL : FindSPSInCache1(m, q, sps[0], sps[1]);
- }
-
-// Only DupSuppressInfos newer than the specified 'time' are allowed to remain active
-mDNSlocal void ExpireDupSuppressInfo(DupSuppressInfo ds[DupSuppressInfoSize], mDNSs32 time)
- {
- int i;
- for (i=0; i<DupSuppressInfoSize; i++) if (ds[i].Time - time < 0) ds[i].InterfaceID = mDNSNULL;
- }
-
-mDNSlocal void ExpireDupSuppressInfoOnInterface(DupSuppressInfo ds[DupSuppressInfoSize], mDNSs32 time, mDNSInterfaceID InterfaceID)
- {
- int i;
- for (i=0; i<DupSuppressInfoSize; i++) if (ds[i].InterfaceID == InterfaceID && ds[i].Time - time < 0) ds[i].InterfaceID = mDNSNULL;
- }
-
-mDNSlocal mDNSBool SuppressOnThisInterface(const DupSuppressInfo ds[DupSuppressInfoSize], const NetworkInterfaceInfo * const intf)
- {
- int i;
- mDNSBool v4 = !intf->IPv4Available; // If this interface doesn't do v4, we don't need to find a v4 duplicate of this query
- mDNSBool v6 = !intf->IPv6Available; // If this interface doesn't do v6, we don't need to find a v6 duplicate of this query
- for (i=0; i<DupSuppressInfoSize; i++)
- if (ds[i].InterfaceID == intf->InterfaceID)
- {
- if (ds[i].Type == mDNSAddrType_IPv4) v4 = mDNStrue;
- else if (ds[i].Type == mDNSAddrType_IPv6) v6 = mDNStrue;
- if (v4 && v6) return(mDNStrue);
- }
- return(mDNSfalse);
- }
-
-mDNSlocal int RecordDupSuppressInfo(DupSuppressInfo ds[DupSuppressInfoSize], mDNSs32 Time, mDNSInterfaceID InterfaceID, mDNSs32 Type)
- {
- int i, j;
-
- // See if we have this one in our list somewhere already
- for (i=0; i<DupSuppressInfoSize; i++) if (ds[i].InterfaceID == InterfaceID && ds[i].Type == Type) break;
-
- // If not, find a slot we can re-use
- if (i >= DupSuppressInfoSize)
- {
- i = 0;
- for (j=1; j<DupSuppressInfoSize && ds[i].InterfaceID; j++)
- if (!ds[j].InterfaceID || ds[j].Time - ds[i].Time < 0)
- i = j;
- }
-
- // Record the info about this query we saw
- ds[i].Time = Time;
- ds[i].InterfaceID = InterfaceID;
- ds[i].Type = Type;
-
- return(i);
- }
-
-mDNSlocal void mDNSSendWakeOnResolve(mDNS *const m, DNSQuestion *q)
- {
- int len, i, cnt;
- mDNSInterfaceID InterfaceID = q->InterfaceID;
- domainname *d = &q->qname;
-
- // We can't send magic packets without knowing which interface to send it on.
- if (InterfaceID == mDNSInterface_Any || InterfaceID == mDNSInterface_LocalOnly || InterfaceID == mDNSInterface_P2P)
- {
- LogMsg("mDNSSendWakeOnResolve: ERROR!! Invalid InterfaceID %p for question %##s", InterfaceID, q->qname.c);
- return;
- }
-
- // Split MAC@IPAddress and pass them separately
- len = d->c[0];
- i = 1;
- cnt = 0;
- for (i = 1; i < len; i++)
- {
- if (d->c[i] == '@')
- {
- char EthAddr[18]; // ethernet adddress : 12 bytes + 5 ":" + 1 NULL byte
- char IPAddr[47]; // Max IP address len: 46 bytes (IPv6) + 1 NULL byte
- if (cnt != 5)
- {
- LogMsg("mDNSSendWakeOnResolve: ERROR!! Malformed Ethernet address %##s, cnt %d", q->qname.c, cnt);
- return;
- }
- if ((i - 1) > (int) (sizeof(EthAddr) - 1))
- {
- LogMsg("mDNSSendWakeOnResolve: ERROR!! Malformed Ethernet address %##s, length %d", q->qname.c, i - 1);
- return;
- }
- if ((len - i) > (int)(sizeof(IPAddr) - 1))
- {
- LogMsg("mDNSSendWakeOnResolve: ERROR!! Malformed IP address %##s, length %d", q->qname.c, len - i);
- return;
- }
- mDNSPlatformMemCopy(EthAddr, &d->c[1], i - 1);
- EthAddr[i - 1] = 0;
- mDNSPlatformMemCopy(IPAddr, &d->c[i + 1], len - i);
- IPAddr[len - i] = 0;
- mDNSPlatformSendWakeupPacket(m, InterfaceID, EthAddr, IPAddr, InitialWakeOnResolveCount - q->WakeOnResolveCount);
- return;
- }
- else if (d->c[i] == ':')
- cnt++;
- }
- LogMsg("mDNSSendWakeOnResolve: ERROR!! Malformed WakeOnResolve name %##s", q->qname.c);
- }
-
-
-mDNSlocal mDNSBool AccelerateThisQuery(mDNS *const m, DNSQuestion *q)
- {
- // If more than 90% of the way to the query time, we should unconditionally accelerate it
- if (TimeToSendThisQuestion(q, m->timenow + q->ThisQInterval/10))
- return(mDNStrue);
-
- // If half-way to next scheduled query time, only accelerate if it will add less than 512 bytes to the packet
- if (TimeToSendThisQuestion(q, m->timenow + q->ThisQInterval/2))
- {
- // We forecast: qname (n) type (2) class (2)
- mDNSu32 forecast = (mDNSu32)DomainNameLength(&q->qname) + 4;
- const mDNSu32 slot = HashSlot(&q->qname);
- const CacheGroup *const cg = CacheGroupForName(m, slot, q->qnamehash, &q->qname);
- const CacheRecord *rr;
- for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next) // If we have a resource record in our cache,
- if (rr->resrec.rdlength <= SmallRecordLimit && // which is small enough to sensibly fit in the packet
- SameNameRecordAnswersQuestion(&rr->resrec, q) && // which answers our question
- rr->TimeRcvd + TicksTTL(rr)/2 - m->timenow >= 0 && // and it is less than half-way to expiry
- rr->NextRequiredQuery - (m->timenow + q->ThisQInterval) > 0)// and we'll ask at least once again before NextRequiredQuery
- {
- // We forecast: compressed name (2) type (2) class (2) TTL (4) rdlength (2) rdata (n)
- forecast += 12 + rr->resrec.rdestimate;
- if (forecast >= 512) return(mDNSfalse); // If this would add 512 bytes or more to the packet, don't accelerate
- }
- return(mDNStrue);
- }
-
- return(mDNSfalse);
- }
-
-// How Standard Queries are generated:
-// 1. The Question Section contains the question
-// 2. The Additional Section contains answers we already know, to suppress duplicate responses
-
-// How Probe Queries are generated:
-// 1. The Question Section contains queries for the name we intend to use, with QType=ANY because
-// if some other host is already using *any* records with this name, we want to know about it.
-// 2. The Authority Section contains the proposed values we intend to use for one or more
-// of our records with that name (analogous to the Update section of DNS Update packets)
-// because if some other host is probing at the same time, we each want to know what the other is
-// planning, in order to apply the tie-breaking rule to see who gets to use the name and who doesn't.
-
-mDNSlocal void SendQueries(mDNS *const m)
- {
- mDNSu32 slot;
- CacheGroup *cg;
- CacheRecord *cr;
- AuthRecord *ar;
- int pktcount = 0;
- DNSQuestion *q;
- // For explanation of maxExistingQuestionInterval logic, see comments for maxExistingAnnounceInterval
- mDNSs32 maxExistingQuestionInterval = 0;
- const NetworkInterfaceInfo *intf = GetFirstActiveInterface(m->HostInterfaces);
- CacheRecord *KnownAnswerList = mDNSNULL;
-
- // 1. If time for a query, work out what we need to do
-
- // We're expecting to send a query anyway, so see if any expiring cache records are close enough
- // to their NextRequiredQuery to be worth batching them together with this one
- FORALL_CACHERECORDS(slot, cg, cr)
- if (cr->CRActiveQuestion && cr->UnansweredQueries < MaxUnansweredQueries)
- if (m->timenow + TicksTTL(cr)/50 - cr->NextRequiredQuery >= 0)
- {
- debugf("Sending %d%% cache expiration query for %s", 80 + 5 * cr->UnansweredQueries, CRDisplayString(m, cr));
- q = cr->CRActiveQuestion;
- ExpireDupSuppressInfoOnInterface(q->DupSuppress, m->timenow - TicksTTL(cr)/20, cr->resrec.InterfaceID);
- // For uDNS queries (TargetQID non-zero) we adjust LastQTime,
- // and bump UnansweredQueries so that we don't spin trying to send the same cache expiration query repeatedly
- if (q->Target.type) q->SendQNow = mDNSInterfaceMark; // If targeted query, mark it
- else if (!mDNSOpaque16IsZero(q->TargetQID)) { q->LastQTime = m->timenow - q->ThisQInterval; cr->UnansweredQueries++; }
- else if (q->SendQNow == mDNSNULL) q->SendQNow = cr->resrec.InterfaceID;
- else if (q->SendQNow != cr->resrec.InterfaceID) q->SendQNow = mDNSInterfaceMark;
- }
-
- // Scan our list of questions to see which:
- // *WideArea* queries need to be sent
- // *unicast* queries need to be sent
- // *multicast* queries we're definitely going to send
- if (m->CurrentQuestion)
- LogMsg("SendQueries ERROR m->CurrentQuestion already set: %##s (%s)", m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype));
- m->CurrentQuestion = m->Questions;
- while (m->CurrentQuestion && m->CurrentQuestion != m->NewQuestions)
- {
- q = m->CurrentQuestion;
- if (q->Target.type && (q->SendQNow || TimeToSendThisQuestion(q, m->timenow)))
- {
- mDNSu8 *qptr = m->omsg.data;
- const mDNSu8 *const limit = m->omsg.data + sizeof(m->omsg.data);
-
- // If we fail to get a new on-demand socket (should only happen cases of the most extreme resource exhaustion), we'll try again next time
- if (!q->LocalSocket) q->LocalSocket = mDNSPlatformUDPSocket(m, zeroIPPort);
- if (q->LocalSocket)
- {
- InitializeDNSMessage(&m->omsg.h, q->TargetQID, QueryFlags);
- qptr = putQuestion(&m->omsg, qptr, limit, &q->qname, q->qtype, q->qclass);
- mDNSSendDNSMessage(m, &m->omsg, qptr, mDNSInterface_Any, q->LocalSocket, &q->Target, q->TargetPort, mDNSNULL, mDNSNULL);
- q->ThisQInterval *= QuestionIntervalStep;
- }
- if (q->ThisQInterval > MaxQuestionInterval)
- q->ThisQInterval = MaxQuestionInterval;
- q->LastQTime = m->timenow;
- q->LastQTxTime = m->timenow;
- q->RecentAnswerPkts = 0;
- q->SendQNow = mDNSNULL;
- q->ExpectUnicastResp = NonZeroTime(m->timenow);
- }
- else if (mDNSOpaque16IsZero(q->TargetQID) && !q->Target.type && TimeToSendThisQuestion(q, m->timenow))
- {
- //LogInfo("Time to send %##s (%s) %d", q->qname.c, DNSTypeName(q->qtype), m->timenow - NextQSendTime(q));
- q->SendQNow = mDNSInterfaceMark; // Mark this question for sending on all interfaces
- if (maxExistingQuestionInterval < q->ThisQInterval)
- maxExistingQuestionInterval = q->ThisQInterval;
- }
- // If m->CurrentQuestion wasn't modified out from under us, advance it now
- // We can't do this at the start of the loop because uDNS_CheckCurrentQuestion() depends on having
- // m->CurrentQuestion point to the right question
- if (q == m->CurrentQuestion) m->CurrentQuestion = m->CurrentQuestion->next;
- }
- while (m->CurrentQuestion)
- {
- LogInfo("SendQueries question loop 1: Skipping NewQuestion %##s (%s)", m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype));
- m->CurrentQuestion = m->CurrentQuestion->next;
- }
- m->CurrentQuestion = mDNSNULL;
-
- // Scan our list of questions
- // (a) to see if there are any more that are worth accelerating, and
- // (b) to update the state variables for *all* the questions we're going to send
- // Note: Don't set NextScheduledQuery until here, because uDNS_CheckCurrentQuestion in the loop above can add new questions to the list,
- // which causes NextScheduledQuery to get (incorrectly) set to m->timenow. Setting it here is the right place, because the very
- // next thing we do is scan the list and call SetNextQueryTime() for every question we find, so we know we end up with the right value.
- m->NextScheduledQuery = m->timenow + 0x78000000;
- for (q = m->Questions; q && q != m->NewQuestions; q=q->next)
- {
- if (mDNSOpaque16IsZero(q->TargetQID) && (q->SendQNow ||
- (!q->Target.type && ActiveQuestion(q) && q->ThisQInterval <= maxExistingQuestionInterval && AccelerateThisQuery(m,q))))
- {
- // If at least halfway to next query time, advance to next interval
- // If less than halfway to next query time, then
- // treat this as logically a repeat of the last transmission, without advancing the interval
- if (m->timenow - (q->LastQTime + (q->ThisQInterval/2)) >= 0)
- {
- //LogInfo("Accelerating %##s (%s) %d", q->qname.c, DNSTypeName(q->qtype), m->timenow - NextQSendTime(q));
- q->SendQNow = mDNSInterfaceMark; // Mark this question for sending on all interfaces
- debugf("SendQueries: %##s (%s) next interval %d seconds RequestUnicast = %d",
- q->qname.c, DNSTypeName(q->qtype), q->ThisQInterval / InitialQuestionInterval, q->RequestUnicast);
- q->ThisQInterval *= QuestionIntervalStep;
- if (q->ThisQInterval > MaxQuestionInterval)
- q->ThisQInterval = MaxQuestionInterval;
- else if (q->CurrentAnswers == 0 && q->ThisQInterval == InitialQuestionInterval * QuestionIntervalStep3 && !q->RequestUnicast &&
- !(RRTypeIsAddressType(q->qtype) && CacheHasAddressTypeForName(m, &q->qname, q->qnamehash)))
- {
- // Generally don't need to log this.
- // It's not especially noteworthy if a query finds no results -- this usually happens for domain
- // enumeration queries in the LL subdomain (e.g. "db._dns-sd._udp.0.0.254.169.in-addr.arpa")
- // and when there simply happen to be no instances of the service the client is looking
- // for (e.g. iTunes is set to look for RAOP devices, and the current network has none).
- debugf("SendQueries: Zero current answers for %##s (%s); will reconfirm antecedents",
- q->qname.c, DNSTypeName(q->qtype));
- // Sending third query, and no answers yet; time to begin doubting the source
- ReconfirmAntecedents(m, &q->qname, q->qnamehash, 0);
- }
- }
-
- // Mark for sending. (If no active interfaces, then don't even try.)
- q->SendOnAll = (q->SendQNow == mDNSInterfaceMark);
- if (q->SendOnAll)
- {
- q->SendQNow = !intf ? mDNSNULL : (q->InterfaceID) ? q->InterfaceID : intf->InterfaceID;
- q->LastQTime = m->timenow;
- }
-
- // If we recorded a duplicate suppression for this question less than half an interval ago,
- // then we consider it recent enough that we don't need to do an identical query ourselves.
- ExpireDupSuppressInfo(q->DupSuppress, m->timenow - q->ThisQInterval/2);
-
- q->LastQTxTime = m->timenow;
- q->RecentAnswerPkts = 0;
- if (q->RequestUnicast) q->RequestUnicast--;
- }
- // For all questions (not just the ones we're sending) check what the next scheduled event will be
- // We don't need to consider NewQuestions here because for those we'll set m->NextScheduledQuery in AnswerNewQuestion
- SetNextQueryTime(m,q);
- }
-
- // 2. Scan our authoritative RR list to see what probes we might need to send
-
- m->NextScheduledProbe = m->timenow + 0x78000000;
-
- if (m->CurrentRecord)
- LogMsg("SendQueries ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord));
- m->CurrentRecord = m->ResourceRecords;
- while (m->CurrentRecord)
- {
- ar = m->CurrentRecord;
- m->CurrentRecord = ar->next;
- if (!AuthRecord_uDNS(ar) && ar->resrec.RecordType == kDNSRecordTypeUnique) // For all records that are still probing...
- {
- // 1. If it's not reached its probe time, just make sure we update m->NextScheduledProbe correctly
- if (m->timenow - (ar->LastAPTime + ar->ThisAPInterval) < 0)
- {
- SetNextAnnounceProbeTime(m, ar);
- }
- // 2. else, if it has reached its probe time, mark it for sending and then update m->NextScheduledProbe correctly
- else if (ar->ProbeCount)
- {
- if (ar->AddressProxy.type == mDNSAddrType_IPv4)
- {
- LogSPS("SendQueries ARP Probe %d %s %s", ar->ProbeCount, InterfaceNameForID(m, ar->resrec.InterfaceID), ARDisplayString(m,ar));
- SendARP(m, 1, ar, &zerov4Addr, &zeroEthAddr, &ar->AddressProxy.ip.v4, &ar->WakeUp.IMAC);
- }
- else if (ar->AddressProxy.type == mDNSAddrType_IPv6)
- {
- LogSPS("SendQueries NDP Probe %d %s %s", ar->ProbeCount, InterfaceNameForID(m, ar->resrec.InterfaceID), ARDisplayString(m,ar));
- // IPv6 source = zero
- // No target hardware address
- // IPv6 target address is address we're probing
- // Ethernet destination address is Ethernet interface address of the Sleep Proxy client we're probing
- SendNDP(m, NDP_Sol, 0, ar, &zerov6Addr, mDNSNULL, &ar->AddressProxy.ip.v6, &ar->WakeUp.IMAC);
- }
- // Mark for sending. (If no active interfaces, then don't even try.)
- ar->SendRNow = (!intf || ar->WakeUp.HMAC.l[0]) ? mDNSNULL : ar->resrec.InterfaceID ? ar->resrec.InterfaceID : intf->InterfaceID;
- ar->LastAPTime = m->timenow;
- // When we have a late conflict that resets a record to probing state we use a special marker value greater
- // than DefaultProbeCountForTypeUnique. Here we detect that state and reset ar->ProbeCount back to the right value.
- if (ar->ProbeCount > DefaultProbeCountForTypeUnique)
- ar->ProbeCount = DefaultProbeCountForTypeUnique;
- ar->ProbeCount--;
- SetNextAnnounceProbeTime(m, ar);
- if (ar->ProbeCount == 0)
- {
- // If this is the last probe for this record, then see if we have any matching records
- // on our duplicate list which should similarly have their ProbeCount cleared to zero...
- AuthRecord *r2;
- for (r2 = m->DuplicateRecords; r2; r2=r2->next)
- if (r2->resrec.RecordType == kDNSRecordTypeUnique && RecordIsLocalDuplicate(r2, ar))
- r2->ProbeCount = 0;
- // ... then acknowledge this record to the client.
- // We do this optimistically, just as we're about to send the third probe.
- // This helps clients that both advertise and browse, and want to filter themselves
- // from the browse results list, because it helps ensure that the registration
- // confirmation will be delivered 1/4 second *before* the browse "add" event.
- // A potential downside is that we could deliver a registration confirmation and then find out
- // moments later that there's a name conflict, but applications have to be prepared to handle
- // late conflicts anyway (e.g. on connection of network cable, etc.), so this is nothing new.
- if (!ar->Acknowledged) AcknowledgeRecord(m, ar);
- }
- }
- // else, if it has now finished probing, move it to state Verified,
- // and update m->NextScheduledResponse so it will be announced
- else
- {
- if (!ar->Acknowledged) AcknowledgeRecord(m, ar); // Defensive, just in case it got missed somehow
- ar->resrec.RecordType = kDNSRecordTypeVerified;
- ar->ThisAPInterval = DefaultAnnounceIntervalForTypeUnique;
- ar->LastAPTime = m->timenow - DefaultAnnounceIntervalForTypeUnique;
- SetNextAnnounceProbeTime(m, ar);
- }
- }
- }
- m->CurrentRecord = m->DuplicateRecords;
- while (m->CurrentRecord)
- {
- ar = m->CurrentRecord;
- m->CurrentRecord = ar->next;
- if (ar->resrec.RecordType == kDNSRecordTypeUnique && ar->ProbeCount == 0 && !ar->Acknowledged)
- AcknowledgeRecord(m, ar);
- }
-
- // 3. Now we know which queries and probes we're sending,
- // go through our interface list sending the appropriate queries on each interface
- while (intf)
- {
- const int OwnerRecordSpace = (m->AnnounceOwner && intf->MAC.l[0]) ? DNSOpt_Header_Space + DNSOpt_Owner_Space(&m->PrimaryMAC, &intf->MAC) : 0;
- mDNSu8 *queryptr = m->omsg.data;
- InitializeDNSMessage(&m->omsg.h, zeroID, QueryFlags);
- if (KnownAnswerList) verbosedebugf("SendQueries: KnownAnswerList set... Will continue from previous packet");
- if (!KnownAnswerList)
- {
- // Start a new known-answer list
- CacheRecord **kalistptr = &KnownAnswerList;
- mDNSu32 answerforecast = OwnerRecordSpace; // We start by assuming we'll need at least enough space to put the Owner Option
-
- // Put query questions in this packet
- for (q = m->Questions; q && q != m->NewQuestions; q=q->next)
- {
- if (mDNSOpaque16IsZero(q->TargetQID) && (q->SendQNow == intf->InterfaceID))
- {
- debugf("SendQueries: %s question for %##s (%s) at %d forecast total %d",
- SuppressOnThisInterface(q->DupSuppress, intf) ? "Suppressing" : "Putting ",
- q->qname.c, DNSTypeName(q->qtype), queryptr - m->omsg.data, queryptr + answerforecast - m->omsg.data);
-
- // If we're suppressing this question, or we successfully put it, update its SendQNow state
- if (SuppressOnThisInterface(q->DupSuppress, intf) ||
- BuildQuestion(m, &m->omsg, &queryptr, q, &kalistptr, &answerforecast))
- {
- q->SendQNow = (q->InterfaceID || !q->SendOnAll) ? mDNSNULL : GetNextActiveInterfaceID(intf);
- if (q->WakeOnResolveCount)
- {
- mDNSSendWakeOnResolve(m, q);
- q->WakeOnResolveCount--;
- }
- }
- }
- }
-
- // Put probe questions in this packet
- for (ar = m->ResourceRecords; ar; ar=ar->next)
- if (ar->SendRNow == intf->InterfaceID)
- {
- mDNSBool ucast = (ar->ProbeCount >= DefaultProbeCountForTypeUnique-1) && m->CanReceiveUnicastOn5353;
- mDNSu16 ucbit = (mDNSu16)(ucast ? kDNSQClass_UnicastResponse : 0);
- const mDNSu8 *const limit = m->omsg.data + (m->omsg.h.numQuestions ? NormalMaxDNSMessageData : AbsoluteMaxDNSMessageData);
- // We forecast: compressed name (2) type (2) class (2) TTL (4) rdlength (2) rdata (n)
- mDNSu32 forecast = answerforecast + 12 + ar->resrec.rdestimate;
- mDNSu8 *newptr = putQuestion(&m->omsg, queryptr, limit - forecast, ar->resrec.name, kDNSQType_ANY, (mDNSu16)(ar->resrec.rrclass | ucbit));
- if (newptr)
- {
- queryptr = newptr;
- answerforecast = forecast;
- ar->SendRNow = (ar->resrec.InterfaceID) ? mDNSNULL : GetNextActiveInterfaceID(intf);
- ar->IncludeInProbe = mDNStrue;
- verbosedebugf("SendQueries: Put Question %##s (%s) probecount %d",
- ar->resrec.name->c, DNSTypeName(ar->resrec.rrtype), ar->ProbeCount);
- }
- }
- }
-
- // Put our known answer list (either new one from this question or questions, or remainder of old one from last time)
- while (KnownAnswerList)
- {
- CacheRecord *ka = KnownAnswerList;
- mDNSu32 SecsSinceRcvd = ((mDNSu32)(m->timenow - ka->TimeRcvd)) / mDNSPlatformOneSecond;
- mDNSu8 *newptr = PutResourceRecordTTLWithLimit(&m->omsg, queryptr, &m->omsg.h.numAnswers,
- &ka->resrec, ka->resrec.rroriginalttl - SecsSinceRcvd, m->omsg.data + NormalMaxDNSMessageData - OwnerRecordSpace);
- if (newptr)
- {
- verbosedebugf("SendQueries: Put %##s (%s) at %d - %d",
- ka->resrec.name->c, DNSTypeName(ka->resrec.rrtype), queryptr - m->omsg.data, newptr - m->omsg.data);
- queryptr = newptr;
- KnownAnswerList = ka->NextInKAList;
- ka->NextInKAList = mDNSNULL;
- }
- else
- {
- // If we ran out of space and we have more than one question in the packet, that's an error --
- // we shouldn't have put more than one question if there was a risk of us running out of space.
- if (m->omsg.h.numQuestions > 1)
- LogMsg("SendQueries: Put %d answers; No more space for known answers", m->omsg.h.numAnswers);
- m->omsg.h.flags.b[0] |= kDNSFlag0_TC;
- break;
- }
- }
-
- for (ar = m->ResourceRecords; ar; ar=ar->next)
- if (ar->IncludeInProbe)
- {
- mDNSu8 *newptr = PutResourceRecord(&m->omsg, queryptr, &m->omsg.h.numAuthorities, &ar->resrec);
- ar->IncludeInProbe = mDNSfalse;
- if (newptr) queryptr = newptr;
- else LogMsg("SendQueries: How did we fail to have space for the Update record %s", ARDisplayString(m,ar));
- }
-
- if (queryptr > m->omsg.data)
- {
- if (OwnerRecordSpace)
- {
- AuthRecord opt;
- mDNS_SetupResourceRecord(&opt, mDNSNULL, mDNSInterface_Any, kDNSType_OPT, kStandardTTL, kDNSRecordTypeKnownUnique, AuthRecordAny, mDNSNULL, mDNSNULL);
- opt.resrec.rrclass = NormalMaxDNSMessageData;
- opt.resrec.rdlength = sizeof(rdataOPT); // One option in this OPT record
- opt.resrec.rdestimate = sizeof(rdataOPT);
- SetupOwnerOpt(m, intf, &opt.resrec.rdata->u.opt[0]);
- LogSPS("SendQueries putting %s", ARDisplayString(m, &opt));
- queryptr = PutResourceRecordTTLWithLimit(&m->omsg, queryptr, &m->omsg.h.numAdditionals,
- &opt.resrec, opt.resrec.rroriginalttl, m->omsg.data + AbsoluteMaxDNSMessageData);
- if (!queryptr)
- LogMsg("SendQueries: How did we fail to have space for the OPT record (%d/%d/%d/%d) %s",
- m->omsg.h.numQuestions, m->omsg.h.numAnswers, m->omsg.h.numAuthorities, m->omsg.h.numAdditionals, ARDisplayString(m, &opt));
- if (queryptr > m->omsg.data + NormalMaxDNSMessageData)
- if (m->omsg.h.numQuestions != 1 || m->omsg.h.numAnswers != 0 || m->omsg.h.numAuthorities != 1 || m->omsg.h.numAdditionals != 1)
- LogMsg("SendQueries: Why did we generate oversized packet with OPT record %p %p %p (%d/%d/%d/%d) %s",
- m->omsg.data, m->omsg.data + NormalMaxDNSMessageData, queryptr,
- m->omsg.h.numQuestions, m->omsg.h.numAnswers, m->omsg.h.numAuthorities, m->omsg.h.numAdditionals, ARDisplayString(m, &opt));
- }
-
- if ((m->omsg.h.flags.b[0] & kDNSFlag0_TC) && m->omsg.h.numQuestions > 1)
- LogMsg("SendQueries: Should not have more than one question (%d) in a truncated packet", m->omsg.h.numQuestions);
- debugf("SendQueries: Sending %d Question%s %d Answer%s %d Update%s on %p",
- m->omsg.h.numQuestions, m->omsg.h.numQuestions == 1 ? "" : "s",
- m->omsg.h.numAnswers, m->omsg.h.numAnswers == 1 ? "" : "s",
- m->omsg.h.numAuthorities, m->omsg.h.numAuthorities == 1 ? "" : "s", intf->InterfaceID);
- if (intf->IPv4Available) mDNSSendDNSMessage(m, &m->omsg, queryptr, intf->InterfaceID, mDNSNULL, &AllDNSLinkGroup_v4, MulticastDNSPort, mDNSNULL, mDNSNULL);
- if (intf->IPv6Available) mDNSSendDNSMessage(m, &m->omsg, queryptr, intf->InterfaceID, mDNSNULL, &AllDNSLinkGroup_v6, MulticastDNSPort, mDNSNULL, mDNSNULL);
- if (!m->SuppressSending) m->SuppressSending = NonZeroTime(m->timenow + (mDNSPlatformOneSecond+9)/10);
- if (++pktcount >= 1000)
- { LogMsg("SendQueries exceeded loop limit %d: giving up", pktcount); break; }
- // There might be more records left in the known answer list, or more questions to send
- // on this interface, so go around one more time and try again.
- }
- else // Nothing more to send on this interface; go to next
- {
- const NetworkInterfaceInfo *next = GetFirstActiveInterface(intf->next);
- #if MDNS_DEBUGMSGS && 0
- const char *const msg = next ? "SendQueries: Nothing more on %p; moving to %p" : "SendQueries: Nothing more on %p";
- debugf(msg, intf, next);
- #endif
- intf = next;
- }
- }
-
- // 4. Final housekeeping
-
- // 4a. Debugging check: Make sure we announced all our records
- for (ar = m->ResourceRecords; ar; ar=ar->next)
- if (ar->SendRNow)
- {
- if (ar->ARType != AuthRecordLocalOnly && ar->ARType != AuthRecordP2P)
- LogMsg("SendQueries: No active interface %p to send probe: %p %s", ar->SendRNow, ar->resrec.InterfaceID, ARDisplayString(m, ar));
- ar->SendRNow = mDNSNULL;
- }
-
- // 4b. When we have lingering cache records that we're keeping around for a few seconds in the hope
- // that their interface which went away might come back again, the logic will want to send queries
- // for those records, but we can't because their interface isn't here any more, so to keep the
- // state machine ticking over we just pretend we did so.
- // If the interface does not come back in time, the cache record will expire naturally
- FORALL_CACHERECORDS(slot, cg, cr)
- if (cr->CRActiveQuestion && cr->UnansweredQueries < MaxUnansweredQueries)
- if (m->timenow + TicksTTL(cr)/50 - cr->NextRequiredQuery >= 0)
- {
- cr->UnansweredQueries++;
- cr->CRActiveQuestion->SendQNow = mDNSNULL;
- SetNextCacheCheckTimeForRecord(m, cr);
- }
-
- // 4c. Debugging check: Make sure we sent all our planned questions
- // Do this AFTER the lingering cache records check above, because that will prevent spurious warnings for questions
- // we legitimately couldn't send because the interface is no longer available
- for (q = m->Questions; q; q=q->next)
- if (q->SendQNow)
- {
- DNSQuestion *x;
- for (x = m->NewQuestions; x; x=x->next) if (x == q) break; // Check if this question is a NewQuestion
- LogMsg("SendQueries: No active interface %p to send %s question: %p %##s (%s)", q->SendQNow, x ? "new" : "old", q->InterfaceID, q->qname.c, DNSTypeName(q->qtype));
- q->SendQNow = mDNSNULL;
- }
- }
-
-mDNSlocal void SendWakeup(mDNS *const m, mDNSInterfaceID InterfaceID, mDNSEthAddr *EthAddr, mDNSOpaque48 *password)
- {
- int i, j;
- mDNSu8 *ptr = m->omsg.data;
- NetworkInterfaceInfo *intf = FirstInterfaceForID(m, InterfaceID);
- if (!intf) { LogMsg("SendARP: No interface with InterfaceID %p found", InterfaceID); return; }
-
- // 0x00 Destination address
- for (i=0; i<6; i++) *ptr++ = EthAddr->b[i];
-
- // 0x06 Source address (Note: Since we don't currently set the BIOCSHDRCMPLT option, BPF will fill in the real interface address for us)
- for (i=0; i<6; i++) *ptr++ = intf->MAC.b[0];
-
- // 0x0C Ethertype (0x0842)
- *ptr++ = 0x08;
- *ptr++ = 0x42;
-
- // 0x0E Wakeup sync sequence
- for (i=0; i<6; i++) *ptr++ = 0xFF;
-
- // 0x14 Wakeup data
- for (j=0; j<16; j++) for (i=0; i<6; i++) *ptr++ = EthAddr->b[i];
-
- // 0x74 Password
- for (i=0; i<6; i++) *ptr++ = password->b[i];
-
- mDNSPlatformSendRawPacket(m->omsg.data, ptr, InterfaceID);
-
- // For Ethernet switches that don't flood-foward packets with unknown unicast destination MAC addresses,
- // broadcast is the only reliable way to get a wakeup packet to the intended target machine.
- // For 802.11 WPA networks, where a sleeping target machine may have missed a broadcast/multicast
- // key rotation, unicast is the only way to get a wakeup packet to the intended target machine.
- // So, we send one of each, unicast first, then broadcast second.
- for (i=0; i<6; i++) m->omsg.data[i] = 0xFF;
- mDNSPlatformSendRawPacket(m->omsg.data, ptr, InterfaceID);
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - RR List Management & Task Management
-#endif
-
-// Whenever a question is answered, reset its state so that we don't query
-// the network repeatedly. This happens first time when we answer the question and
-// and later when we refresh the cache.
-mDNSlocal void ResetQuestionState(mDNS *const m, DNSQuestion *q)
- {
- q->LastQTime = m->timenow;
- q->LastQTxTime = m->timenow;
- q->RecentAnswerPkts = 0;
- q->ThisQInterval = MaxQuestionInterval;
- q->RequestUnicast = mDNSfalse;
- // Reset unansweredQueries so that we don't penalize this server later when we
- // start sending queries when the cache expires.
- q->unansweredQueries = 0;
- debugf("ResetQuestionState: Set MaxQuestionInterval for %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- }
-
-// Note: AnswerCurrentQuestionWithResourceRecord can call a user callback, which may change the record list and/or question list.
-// Any code walking either list must use the m->CurrentQuestion (and possibly m->CurrentRecord) mechanism to protect against this.
-// In fact, to enforce this, the routine will *only* answer the question currently pointed to by m->CurrentQuestion,
-// which will be auto-advanced (possibly to NULL) if the client callback cancels the question.
-mDNSexport void AnswerCurrentQuestionWithResourceRecord(mDNS *const m, CacheRecord *const rr, const QC_result AddRecord)
- {
- DNSQuestion *const q = m->CurrentQuestion;
- mDNSBool followcname = FollowCNAME(q, &rr->resrec, AddRecord);
-
- verbosedebugf("AnswerCurrentQuestionWithResourceRecord:%4lu %s TTL %d %s",
- q->CurrentAnswers, AddRecord ? "Add" : "Rmv", rr->resrec.rroriginalttl, CRDisplayString(m, rr));
-
- // Normally we don't send out the unicast query if we have answered using our local only auth records e.g., /etc/hosts.
- // But if the query for "A" record has a local answer but query for "AAAA" record has no local answer, we might
- // send the AAAA query out which will come back with CNAME and will also answer the "A" query. To prevent that,
- // we check to see if that query already has a unique local answer.
- if (q->LOAddressAnswers)
- {
- LogInfo("AnswerCurrentQuestionWithResourceRecord: Question %p %##s (%s) not answering with record %s due to "
- "LOAddressAnswers %d", q, q->qname.c, DNSTypeName(q->qtype), ARDisplayString(m, rr),
- q->LOAddressAnswers);
- return;
- }
-
- if (QuerySuppressed(q))
- {
- // If the query is suppressed, then we don't want to answer from the cache. But if this query is
- // supposed to time out, we still want to callback the clients. We do this only for TimeoutQuestions
- // that are timing out, which we know are answered with Negative cache record when timing out.
- if (!q->TimeoutQuestion || rr->resrec.RecordType != kDNSRecordTypePacketNegative || (m->timenow - q->StopTime < 0))
- return;
- }
-
- // Note: Use caution here. In the case of records with rr->DelayDelivery set, AnswerCurrentQuestionWithResourceRecord(... mDNStrue)
- // may be called twice, once when the record is received, and again when it's time to notify local clients.
- // If any counters or similar are added here, care must be taken to ensure that they are not double-incremented by this.
-
- rr->LastUsed = m->timenow;
- if (AddRecord == QC_add && !q->DuplicateOf && rr->CRActiveQuestion != q)
- {
- if (!rr->CRActiveQuestion) m->rrcache_active++; // If not previously active, increment rrcache_active count
- debugf("AnswerCurrentQuestionWithResourceRecord: Updating CRActiveQuestion from %p to %p for cache record %s, CurrentAnswer %d",
- rr->CRActiveQuestion, q, CRDisplayString(m,rr), q->CurrentAnswers);
- rr->CRActiveQuestion = q; // We know q is non-null
- SetNextCacheCheckTimeForRecord(m, rr);
- }
-
- // If this is:
- // (a) a no-cache add, where we've already done at least one 'QM' query, or
- // (b) a normal add, where we have at least one unique-type answer,
- // then there's no need to keep polling the network.
- // (If we have an answer in the cache, then we'll automatically ask again in time to stop it expiring.)
- // We do this for mDNS questions and uDNS one-shot questions, but not for
- // uDNS LongLived questions, because that would mess up our LLQ lease renewal timing.
- if ((AddRecord == QC_addnocache && !q->RequestUnicast) ||
- (AddRecord == QC_add && (q->ExpectUnique || (rr->resrec.RecordType & kDNSRecordTypePacketUniqueMask))))
- if (ActiveQuestion(q) && (mDNSOpaque16IsZero(q->TargetQID) || !q->LongLived))
- {
- ResetQuestionState(m, q);
- }
-
- if (rr->DelayDelivery) return; // We'll come back later when CacheRecordDeferredAdd() calls us
-
- // Only deliver negative answers if client has explicitly requested them
- if (rr->resrec.RecordType == kDNSRecordTypePacketNegative || (q->qtype != kDNSType_NSEC && RRAssertsNonexistence(&rr->resrec, q->qtype)))
- if (!AddRecord || !q->ReturnIntermed) return;
-
- // For CNAME results to non-CNAME questions, only inform the client if they explicitly requested that
- if (q->QuestionCallback && !q->NoAnswer && (!followcname || q->ReturnIntermed))
- {
- mDNS_DropLockBeforeCallback(); // Allow client (and us) to legally make mDNS API calls
- if (q->qtype != kDNSType_NSEC && RRAssertsNonexistence(&rr->resrec, q->qtype))
- {
- CacheRecord neg;
- MakeNegativeCacheRecord(m, &neg, &q->qname, q->qnamehash, q->qtype, q->qclass, 1, rr->resrec.InterfaceID, q->qDNSServer);
- q->QuestionCallback(m, q, &neg.resrec, AddRecord);
- }
- else
- q->QuestionCallback(m, q, &rr->resrec, AddRecord);
- mDNS_ReclaimLockAfterCallback(); // Decrement mDNS_reentrancy to block mDNS API calls again
- }
- // Note: Proceed with caution here because client callback function is allowed to do anything,
- // including starting/stopping queries, registering/deregistering records, etc.
-
- if (followcname && m->CurrentQuestion == q)
- AnswerQuestionByFollowingCNAME(m, q, &rr->resrec);
- }
-
-// New Questions are answered through AnswerNewQuestion. But there may not have been any
-// matching cache records for the questions when it is called. There are two possibilities.
-//
-// 1) There are no cache records
-// 2) There are cache records but the DNSServers between question and cache record don't match.
-//
-// In the case of (1), where there are no cache records and later we add them when we get a response,
-// CacheRecordAdd/CacheRecordDeferredAdd will take care of adding the cache and delivering the ADD
-// events to the application. If we already have a cache entry, then no ADD events are delivered
-// unless the RDATA has changed
-//
-// In the case of (2) where we had the cache records and did not answer because of the DNSServer mismatch,
-// we need to answer them whenever we change the DNSServer. But we can't do it at the instant the DNSServer
-// changes because when we do the callback, the question can get deleted and the calling function would not
-// know how to handle it. So, we run this function from mDNS_Execute to handle DNSServer changes on the
-// question
-
-mDNSlocal void AnswerQuestionsForDNSServerChanges(mDNS *const m)
- {
- DNSQuestion *q;
- DNSQuestion *qnext;
- CacheRecord *rr;
- mDNSu32 slot;
- CacheGroup *cg;
-
- if (m->CurrentQuestion)
- LogMsg("AnswerQuestionsForDNSServerChanges: ERROR m->CurrentQuestion already set: %##s (%s)",
- m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype));
-
- for (q = m->Questions; q && q != m->NewQuestions; q = qnext)
- {
- qnext = q->next;
-
- // multicast or DNSServers did not change.
- if (mDNSOpaque16IsZero(q->TargetQID)) continue;
- if (!q->deliverAddEvents) continue;
-
- // We are going to look through the cache for this question since it changed
- // its DNSserver last time. Reset it so that we don't call them again. Calling
- // them again will deliver duplicate events to the application
- q->deliverAddEvents = mDNSfalse;
- if (QuerySuppressed(q)) continue;
- m->CurrentQuestion = q;
- slot = HashSlot(&q->qname);
- cg = CacheGroupForName(m, slot, q->qnamehash, &q->qname);
- for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next)
- {
- if (SameNameRecordAnswersQuestion(&rr->resrec, q))
- {
- LogInfo("AnswerQuestionsForDNSServerChanges: Calling AnswerCurrentQuestionWithResourceRecord for question %p %##s using resource record %s",
- q, q->qname.c, CRDisplayString(m, rr));
- // When this question penalizes a DNS server and has no more DNS servers to pick, we normally
- // deliver a negative cache response and suspend the question for 60 seconds (see uDNS_CheckCurrentQuestion).
- // But sometimes we may already find the negative cache entry and deliver that here as the process
- // of changing DNS servers. When the cache entry is about to expire, we will resend the question and
- // that time, we need to make sure that we have a valid DNS server. Otherwise, we will deliver
- // a negative cache response without trying the server.
- if (!q->qDNSServer && !q->DuplicateOf && rr->resrec.RecordType == kDNSRecordTypePacketNegative)
- {
- DNSQuestion *qptr;
- SetValidDNSServers(m, q);
- q->qDNSServer = GetServerForQuestion(m, q);
- for (qptr = q->next ; qptr; qptr = qptr->next)
- if (qptr->DuplicateOf == q) { qptr->validDNSServers = q->validDNSServers; qptr->qDNSServer = q->qDNSServer; }
- }
- q->CurrentAnswers++;
- if (rr->resrec.rdlength > SmallRecordLimit) q->LargeAnswers++;
- if (rr->resrec.RecordType & kDNSRecordTypePacketUniqueMask) q->UniqueAnswers++;
- AnswerCurrentQuestionWithResourceRecord(m, rr, QC_add);
- if (m->CurrentQuestion != q) break; // If callback deleted q, then we're finished here
- }
- }
- }
- m->CurrentQuestion = mDNSNULL;
- }
-
-mDNSlocal void CacheRecordDeferredAdd(mDNS *const m, CacheRecord *rr)
- {
- rr->DelayDelivery = 0;
- if (m->CurrentQuestion)
- LogMsg("CacheRecordDeferredAdd ERROR m->CurrentQuestion already set: %##s (%s)",
- m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype));
- m->CurrentQuestion = m->Questions;
- while (m->CurrentQuestion && m->CurrentQuestion != m->NewQuestions)
- {
- DNSQuestion *q = m->CurrentQuestion;
- if (ResourceRecordAnswersQuestion(&rr->resrec, q))
- AnswerCurrentQuestionWithResourceRecord(m, rr, QC_add);
- if (m->CurrentQuestion == q) // If m->CurrentQuestion was not auto-advanced, do it ourselves now
- m->CurrentQuestion = q->next;
- }
- m->CurrentQuestion = mDNSNULL;
- }
-
-mDNSlocal mDNSs32 CheckForSoonToExpireRecords(mDNS *const m, const domainname *const name, const mDNSu32 namehash, const mDNSu32 slot)
- {
- const mDNSs32 threshhold = m->timenow + mDNSPlatformOneSecond; // See if there are any records expiring within one second
- const mDNSs32 start = m->timenow - 0x10000000;
- mDNSs32 delay = start;
- CacheGroup *cg = CacheGroupForName(m, slot, namehash, name);
- const CacheRecord *rr;
- for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next)
- if (threshhold - RRExpireTime(rr) >= 0) // If we have records about to expire within a second
- if (delay - RRExpireTime(rr) < 0) // then delay until after they've been deleted
- delay = RRExpireTime(rr);
- if (delay - start > 0) return(NonZeroTime(delay));
- else return(0);
- }
-
-// CacheRecordAdd is only called from CreateNewCacheEntry, *never* directly as a result of a client API call.
-// If new questions are created as a result of invoking client callbacks, they will be added to
-// the end of the question list, and m->NewQuestions will be set to indicate the first new question.
-// rr is a new CacheRecord just received into our cache
-// (kDNSRecordTypePacketAns/PacketAnsUnique/PacketAdd/PacketAddUnique).
-// Note: CacheRecordAdd calls AnswerCurrentQuestionWithResourceRecord which can call a user callback,
-// which may change the record list and/or question list.
-// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this.
-mDNSlocal void CacheRecordAdd(mDNS *const m, CacheRecord *rr)
- {
- DNSQuestion *q;
-
- // We stop when we get to NewQuestions -- if we increment their CurrentAnswers/LargeAnswers/UniqueAnswers
- // counters here we'll end up double-incrementing them when we do it again in AnswerNewQuestion().
- for (q = m->Questions; q && q != m->NewQuestions; q=q->next)
- {
- if (ResourceRecordAnswersQuestion(&rr->resrec, q))
- {
- // If this question is one that's actively sending queries, and it's received ten answers within one
- // second of sending the last query packet, then that indicates some radical network topology change,
- // so reset its exponential backoff back to the start. We must be at least at the eight-second interval
- // to do this. If we're at the four-second interval, or less, there's not much benefit accelerating
- // because we will anyway send another query within a few seconds. The first reset query is sent out
- // randomized over the next four seconds to reduce possible synchronization between machines.
- if (q->LastAnswerPktNum != m->PktNum)
- {
- q->LastAnswerPktNum = m->PktNum;
- if (mDNSOpaque16IsZero(q->TargetQID) && ActiveQuestion(q) && ++q->RecentAnswerPkts >= 10 &&
- q->ThisQInterval > InitialQuestionInterval * QuestionIntervalStep3 && m->timenow - q->LastQTxTime < mDNSPlatformOneSecond)
- {
- LogMsg("CacheRecordAdd: %##s (%s) got immediate answer burst (%d); restarting exponential backoff sequence (%d)",
- q->qname.c, DNSTypeName(q->qtype), q->RecentAnswerPkts, q->ThisQInterval);
- q->LastQTime = m->timenow - InitialQuestionInterval + (mDNSs32)mDNSRandom((mDNSu32)mDNSPlatformOneSecond*4);
- q->ThisQInterval = InitialQuestionInterval;
- SetNextQueryTime(m,q);
- }
- }
- verbosedebugf("CacheRecordAdd %p %##s (%s) %lu %#a:%d question %p", rr, rr->resrec.name->c,
- DNSTypeName(rr->resrec.rrtype), rr->resrec.rroriginalttl, rr->resrec.rDNSServer ?
- &rr->resrec.rDNSServer->addr : mDNSNULL, mDNSVal16(rr->resrec.rDNSServer ?
- rr->resrec.rDNSServer->port : zeroIPPort), q);
- q->CurrentAnswers++;
- q->unansweredQueries = 0;
- if (rr->resrec.rdlength > SmallRecordLimit) q->LargeAnswers++;
- if (rr->resrec.RecordType & kDNSRecordTypePacketUniqueMask) q->UniqueAnswers++;
- if (q->CurrentAnswers > 4000)
- {
- static int msgcount = 0;
- if (msgcount++ < 10)
- LogMsg("CacheRecordAdd: %##s (%s) has %d answers; shedding records to resist DOS attack",
- q->qname.c, DNSTypeName(q->qtype), q->CurrentAnswers);
- rr->resrec.rroriginalttl = 0;
- rr->UnansweredQueries = MaxUnansweredQueries;
- }
- }
- }
-
- if (!rr->DelayDelivery)
- {
- if (m->CurrentQuestion)
- LogMsg("CacheRecordAdd ERROR m->CurrentQuestion already set: %##s (%s)", m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype));
- m->CurrentQuestion = m->Questions;
- while (m->CurrentQuestion && m->CurrentQuestion != m->NewQuestions)
- {
- q = m->CurrentQuestion;
- if (ResourceRecordAnswersQuestion(&rr->resrec, q))
- AnswerCurrentQuestionWithResourceRecord(m, rr, QC_add);
- if (m->CurrentQuestion == q) // If m->CurrentQuestion was not auto-advanced, do it ourselves now
- m->CurrentQuestion = q->next;
- }
- m->CurrentQuestion = mDNSNULL;
- }
-
- SetNextCacheCheckTimeForRecord(m, rr);
- }
-
-// NoCacheAnswer is only called from mDNSCoreReceiveResponse, *never* directly as a result of a client API call.
-// If new questions are created as a result of invoking client callbacks, they will be added to
-// the end of the question list, and m->NewQuestions will be set to indicate the first new question.
-// rr is a new CacheRecord just received from the wire (kDNSRecordTypePacketAns/AnsUnique/Add/AddUnique)
-// but we don't have any place to cache it. We'll deliver question 'add' events now, but we won't have any
-// way to deliver 'remove' events in future, nor will we be able to include this in known-answer lists,
-// so we immediately bump ThisQInterval up to MaxQuestionInterval to avoid pounding the network.
-// Note: NoCacheAnswer calls AnswerCurrentQuestionWithResourceRecord which can call a user callback,
-// which may change the record list and/or question list.
-// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this.
-mDNSlocal void NoCacheAnswer(mDNS *const m, CacheRecord *rr)
- {
- LogMsg("No cache space: Delivering non-cached result for %##s", m->rec.r.resrec.name->c);
- if (m->CurrentQuestion)
- LogMsg("NoCacheAnswer ERROR m->CurrentQuestion already set: %##s (%s)", m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype));
- m->CurrentQuestion = m->Questions;
- // We do this for *all* questions, not stopping when we get to m->NewQuestions,
- // since we're not caching the record and we'll get no opportunity to do this later
- while (m->CurrentQuestion)
- {
- DNSQuestion *q = m->CurrentQuestion;
- if (ResourceRecordAnswersQuestion(&rr->resrec, q))
- AnswerCurrentQuestionWithResourceRecord(m, rr, QC_addnocache); // QC_addnocache means "don't expect remove events for this"
- if (m->CurrentQuestion == q) // If m->CurrentQuestion was not auto-advanced, do it ourselves now
- m->CurrentQuestion = q->next;
- }
- m->CurrentQuestion = mDNSNULL;
- }
-
-// CacheRecordRmv is only called from CheckCacheExpiration, which is called from mDNS_Execute.
-// Note that CacheRecordRmv is *only* called for records that are referenced by at least one active question.
-// If new questions are created as a result of invoking client callbacks, they will be added to
-// the end of the question list, and m->NewQuestions will be set to indicate the first new question.
-// rr is an existing cache CacheRecord that just expired and is being deleted
-// (kDNSRecordTypePacketAns/PacketAnsUnique/PacketAdd/PacketAddUnique).
-// Note: CacheRecordRmv calls AnswerCurrentQuestionWithResourceRecord which can call a user callback,
-// which may change the record list and/or question list.
-// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this.
-mDNSlocal void CacheRecordRmv(mDNS *const m, CacheRecord *rr)
- {
- if (m->CurrentQuestion)
- LogMsg("CacheRecordRmv ERROR m->CurrentQuestion already set: %##s (%s)",
- m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype));
- m->CurrentQuestion = m->Questions;
-
- // We stop when we get to NewQuestions -- for new questions their CurrentAnswers/LargeAnswers/UniqueAnswers counters
- // will all still be zero because we haven't yet gone through the cache counting how many answers we have for them.
- while (m->CurrentQuestion && m->CurrentQuestion != m->NewQuestions)
- {
- DNSQuestion *q = m->CurrentQuestion;
- // When a question enters suppressed state, we generate RMV events and generate a negative
- // response. A cache may be present that answers this question e.g., cache entry generated
- // before the question became suppressed. We need to skip the suppressed questions here as
- // the RMV event has already been generated.
- if (!QuerySuppressed(q) && ResourceRecordAnswersQuestion(&rr->resrec, q))
- {
- verbosedebugf("CacheRecordRmv %p %s", rr, CRDisplayString(m, rr));
- q->FlappingInterface1 = mDNSNULL;
- q->FlappingInterface2 = mDNSNULL;
-
- // When a question changes DNS server, it is marked with deliverAddEvents if we find any
- // cache entry corresponding to the new DNS server. Before we deliver the ADD event, the
- // cache entry may be removed in which case CurrentAnswers can be zero.
- if (q->deliverAddEvents && !q->CurrentAnswers)
- {
- LogInfo("CacheRecordRmv: Question %p %##s (%s) deliverAddEvents set, DNSServer %#a:%d",
- q, q->qname.c, DNSTypeName(q->qtype), q->qDNSServer ? &q->qDNSServer->addr : mDNSNULL,
- mDNSVal16(q->qDNSServer ? q->qDNSServer->port : zeroIPPort));
- m->CurrentQuestion = q->next;
- continue;
- }
- if (q->CurrentAnswers == 0)
- LogMsg("CacheRecordRmv ERROR!!: How can CurrentAnswers already be zero for %p %##s (%s) DNSServer %#a:%d",
- q, q->qname.c, DNSTypeName(q->qtype), q->qDNSServer ? &q->qDNSServer->addr : mDNSNULL,
- mDNSVal16(q->qDNSServer ? q->qDNSServer->port : zeroIPPort));
- else
- {
- q->CurrentAnswers--;
- if (rr->resrec.rdlength > SmallRecordLimit) q->LargeAnswers--;
- if (rr->resrec.RecordType & kDNSRecordTypePacketUniqueMask) q->UniqueAnswers--;
- }
- if (rr->resrec.rdata->MaxRDLength) // Never generate "remove" events for negative results
- {
- if (q->CurrentAnswers == 0)
- {
- LogInfo("CacheRecordRmv: Last answer for %##s (%s) expired from cache; will reconfirm antecedents",
- q->qname.c, DNSTypeName(q->qtype));
- ReconfirmAntecedents(m, &q->qname, q->qnamehash, 0);
- }
- AnswerCurrentQuestionWithResourceRecord(m, rr, QC_rmv);
- }
- }
- if (m->CurrentQuestion == q) // If m->CurrentQuestion was not auto-advanced, do it ourselves now
- m->CurrentQuestion = q->next;
- }
- m->CurrentQuestion = mDNSNULL;
- }
-
-mDNSlocal void ReleaseCacheEntity(mDNS *const m, CacheEntity *e)
- {
-#if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING >= 1
- unsigned int i;
- for (i=0; i<sizeof(*e); i++) ((char*)e)[i] = 0xFF;
-#endif
- e->next = m->rrcache_free;
- m->rrcache_free = e;
- m->rrcache_totalused--;
- }
-
-mDNSlocal void ReleaseCacheGroup(mDNS *const m, CacheGroup **cp)
- {
- CacheEntity *e = (CacheEntity *)(*cp);
- //LogMsg("ReleaseCacheGroup: Releasing CacheGroup for %p, %##s", (*cp)->name->c, (*cp)->name->c);
- if ((*cp)->rrcache_tail != &(*cp)->members)
- LogMsg("ERROR: (*cp)->members == mDNSNULL but (*cp)->rrcache_tail != &(*cp)->members)");
- //if ((*cp)->name != (domainname*)((*cp)->namestorage))
- // LogMsg("ReleaseCacheGroup: %##s, %p %p", (*cp)->name->c, (*cp)->name, (domainname*)((*cp)->namestorage));
- if ((*cp)->name != (domainname*)((*cp)->namestorage)) mDNSPlatformMemFree((*cp)->name);
- (*cp)->name = mDNSNULL;
- *cp = (*cp)->next; // Cut record from list
- ReleaseCacheEntity(m, e);
- }
-
-mDNSlocal void ReleaseCacheRecord(mDNS *const m, CacheRecord *r)
- {
- //LogMsg("ReleaseCacheRecord: Releasing %s", CRDisplayString(m, r));
- if (r->resrec.rdata && r->resrec.rdata != (RData*)&r->smallrdatastorage) mDNSPlatformMemFree(r->resrec.rdata);
- r->resrec.rdata = mDNSNULL;
- ReleaseCacheEntity(m, (CacheEntity *)r);
- }
-
-// Note: We want to be careful that we deliver all the CacheRecordRmv calls before delivering
-// CacheRecordDeferredAdd calls. The in-order nature of the cache lists ensures that all
-// callbacks for old records are delivered before callbacks for newer records.
-mDNSlocal void CheckCacheExpiration(mDNS *const m, const mDNSu32 slot, CacheGroup *const cg)
- {
- CacheRecord **rp = &cg->members;
-
- if (m->lock_rrcache) { LogMsg("CheckCacheExpiration ERROR! Cache already locked!"); return; }
- m->lock_rrcache = 1;
-
- while (*rp)
- {
- CacheRecord *const rr = *rp;
- mDNSs32 event = RRExpireTime(rr);
- if (m->timenow - event >= 0) // If expired, delete it
- {
- *rp = rr->next; // Cut it from the list
- verbosedebugf("CheckCacheExpiration: Deleting%7d %7d %p %s",
- m->timenow - rr->TimeRcvd, rr->resrec.rroriginalttl, rr->CRActiveQuestion, CRDisplayString(m, rr));
- if (rr->CRActiveQuestion) // If this record has one or more active questions, tell them it's going away
- {
- DNSQuestion *q = rr->CRActiveQuestion;
- // When a cache record is about to expire, we expect to do four queries at 80-82%, 85-87%, 90-92% and
- // then 95-97% of the TTL. If the DNS server does not respond, then we will remove the cache entry
- // before we pick a new DNS server. As the question interval is set to MaxQuestionInterval, we may
- // not send out a query anytime soon. Hence, we need to reset the question interval. If this is
- // a normal deferred ADD case, then AnswerCurrentQuestionWithResourceRecord will reset it to
- // MaxQuestionInterval. If we have inactive questions referring to negative cache entries,
- // don't ressurect them as they will deliver duplicate "No such Record" ADD events
- if (!mDNSOpaque16IsZero(q->TargetQID) && !q->LongLived && ActiveQuestion(q))
- {
- q->ThisQInterval = InitialQuestionInterval;
- q->LastQTime = m->timenow - q->ThisQInterval;
- SetNextQueryTime(m, q);
- }
- CacheRecordRmv(m, rr);
- m->rrcache_active--;
- }
- ReleaseCacheRecord(m, rr);
- }
- else // else, not expired; see if we need to query
- {
- // If waiting to delay delivery, do nothing until then
- if (rr->DelayDelivery && rr->DelayDelivery - m->timenow > 0)
- event = rr->DelayDelivery;
- else
- {
- if (rr->DelayDelivery) CacheRecordDeferredAdd(m, rr);
- if (rr->CRActiveQuestion && rr->UnansweredQueries < MaxUnansweredQueries)
- {
- if (m->timenow - rr->NextRequiredQuery < 0) // If not yet time for next query
- event = NextCacheCheckEvent(rr); // then just record when we want the next query
- else // else trigger our question to go out now
- {
- // Set NextScheduledQuery to timenow so that SendQueries() will run.
- // SendQueries() will see that we have records close to expiration, and send FEQs for them.
- m->NextScheduledQuery = m->timenow;
- // After sending the query we'll increment UnansweredQueries and call SetNextCacheCheckTimeForRecord(),
- // which will correctly update m->NextCacheCheck for us.
- event = m->timenow + 0x3FFFFFFF;
- }
- }
- }
- verbosedebugf("CheckCacheExpiration:%6d %5d %s",
- (event - m->timenow) / mDNSPlatformOneSecond, CacheCheckGracePeriod(rr), CRDisplayString(m, rr));
- if (m->rrcache_nextcheck[slot] - event > 0)
- m->rrcache_nextcheck[slot] = event;
- rp = &rr->next;
- }
- }
- if (cg->rrcache_tail != rp) verbosedebugf("CheckCacheExpiration: Updating CacheGroup tail from %p to %p", cg->rrcache_tail, rp);
- cg->rrcache_tail = rp;
- m->lock_rrcache = 0;
- }
-
-mDNSlocal void AnswerNewQuestion(mDNS *const m)
- {
- mDNSBool ShouldQueryImmediately = mDNStrue;
- DNSQuestion *const q = m->NewQuestions; // Grab the question we're going to answer
- mDNSu32 slot = HashSlot(&q->qname);
- CacheGroup *const cg = CacheGroupForName(m, slot, q->qnamehash, &q->qname);
- AuthRecord *lr;
- AuthGroup *ag;
- mDNSBool AnsweredFromCache = mDNSfalse;
-
- verbosedebugf("AnswerNewQuestion: Answering %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
-
- if (cg) CheckCacheExpiration(m, slot, cg);
- if (m->NewQuestions != q) { LogInfo("AnswerNewQuestion: Question deleted while doing CheckCacheExpiration"); goto exit; }
- m->NewQuestions = q->next;
- // Advance NewQuestions to the next *after* calling CheckCacheExpiration, because if we advance it first
- // then CheckCacheExpiration may give this question add/remove callbacks, and it's not yet ready for that.
- //
- // Also, CheckCacheExpiration() calls CacheRecordDeferredAdd() and CacheRecordRmv(), which invoke
- // client callbacks, which may delete their own or any other question. Our mechanism for detecting
- // whether our current m->NewQuestions question got deleted by one of these callbacks is to store the
- // value of m->NewQuestions in 'q' before calling CheckCacheExpiration(), and then verify afterwards
- // that they're still the same. If m->NewQuestions has changed (because mDNS_StopQuery_internal
- // advanced it), that means the question was deleted, so we no longer need to worry about answering
- // it (and indeed 'q' is now a dangling pointer, so dereferencing it at all would be bad, and the
- // values we computed for slot and cg are now stale and relate to a question that no longer exists).
- //
- // We can't use the usual m->CurrentQuestion mechanism for this because CacheRecordDeferredAdd() and
- // CacheRecordRmv() both use that themselves when walking the list of (non-new) questions generating callbacks.
- // Fortunately mDNS_StopQuery_internal auto-advances both m->CurrentQuestion *AND* m->NewQuestions when
- // deleting a question, so luckily we have an easy alternative way of detecting if our question got deleted.
-
- if (m->lock_rrcache) LogMsg("AnswerNewQuestion ERROR! Cache already locked!");
- // This should be safe, because calling the client's question callback may cause the
- // question list to be modified, but should not ever cause the rrcache list to be modified.
- // If the client's question callback deletes the question, then m->CurrentQuestion will
- // be advanced, and we'll exit out of the loop
- m->lock_rrcache = 1;
- if (m->CurrentQuestion)
- LogMsg("AnswerNewQuestion ERROR m->CurrentQuestion already set: %##s (%s)",
- m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype));
- m->CurrentQuestion = q; // Indicate which question we're answering, so we'll know if it gets deleted
-
- if (q->NoAnswer == NoAnswer_Fail)
- {
- LogMsg("AnswerNewQuestion: NoAnswer_Fail %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- MakeNegativeCacheRecord(m, &m->rec.r, &q->qname, q->qnamehash, q->qtype, q->qclass, 60, mDNSInterface_Any, q->qDNSServer);
- q->NoAnswer = NoAnswer_Normal; // Temporarily turn off answer suppression
- AnswerCurrentQuestionWithResourceRecord(m, &m->rec.r, QC_addnocache);
- // Don't touch the question if it has been stopped already
- if (m->CurrentQuestion == q) q->NoAnswer = NoAnswer_Fail; // Restore NoAnswer state
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
- }
- if (m->CurrentQuestion != q) { LogInfo("AnswerNewQuestion: Question deleted while generating NoAnswer_Fail response"); goto exit; }
-
- // See if we want to tell it about LocalOnly records
- if (m->CurrentRecord)
- LogMsg("AnswerNewQuestion ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord));
- slot = AuthHashSlot(&q->qname);
- ag = AuthGroupForName(&m->rrauth, slot, q->qnamehash, &q->qname);
- if (ag)
- {
- m->CurrentRecord = ag->members;
- while (m->CurrentRecord && m->CurrentRecord != ag->NewLocalOnlyRecords)
- {
- AuthRecord *rr = m->CurrentRecord;
- m->CurrentRecord = rr->next;
- //
- // If the question is mDNSInterface_LocalOnly, all records local to the machine should be used
- // to answer the query. This is handled in AnswerNewLocalOnlyQuestion.
- //
- // We handle mDNSInterface_Any and scoped questions here. See LocalOnlyRecordAnswersQuestion for more
- // details on how we handle this case. For P2P we just handle "Interface_Any" questions. For LocalOnly
- // we handle both mDNSInterface_Any and scoped questions.
-
- if (rr->ARType == AuthRecordLocalOnly || (rr->ARType == AuthRecordP2P && q->InterfaceID == mDNSInterface_Any))
- if (LocalOnlyRecordAnswersQuestion(rr, q))
- {
- AnswerLocalQuestionWithLocalAuthRecord(m, rr, mDNStrue);
- if (m->CurrentQuestion != q) break; // If callback deleted q, then we're finished here
- }
- }
- }
- m->CurrentRecord = mDNSNULL;
-
- if (m->CurrentQuestion != q) { LogInfo("AnswerNewQuestion: Question deleted while while giving LocalOnly record answers"); goto exit; }
-
- if (q->LOAddressAnswers)
- {
- LogInfo("AnswerNewQuestion: Question %p %##s (%s) answered using local auth records LOAddressAnswers %d",
- q, q->qname.c, DNSTypeName(q->qtype), q->LOAddressAnswers);
- goto exit;
- }
-
- // Before we go check the cache and ship this query on the wire, we have to be sure that there are
- // no local records that could possibly answer this question. As we did not check the NewLocalRecords, we
- // need to just peek at them to see whether it will answer this question. If it would answer, pretend
- // that we answered. AnswerAllLocalQuestionsWithLocalAuthRecord will answer shortly. This happens normally
- // when we add new /etc/hosts entries and restart the question. It is a new question and also a new record.
- if (ag)
- {
- lr = ag->NewLocalOnlyRecords;
- while (lr)
- {
- if (LORecordAnswersAddressType(lr) && LocalOnlyRecordAnswersQuestion(lr, q))
- {
- LogInfo("AnswerNewQuestion: Question %p %##s (%s) will be answered using new local auth records "
- " LOAddressAnswers %d", q, q->qname.c, DNSTypeName(q->qtype), q->LOAddressAnswers);
- goto exit;
- }
- lr = lr->next;
- }
- }
-
-
- // If we are not supposed to answer this question, generate a negative response.
- // Temporarily suspend the SuppressQuery so that AnswerCurrentQuestionWithResourceRecord can answer the question
- if (QuerySuppressed(q)) { q->SuppressQuery = mDNSfalse; GenerateNegativeResponse(m); q->SuppressQuery = mDNStrue; }
- else
- {
- CacheRecord *rr;
- for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next)
- if (SameNameRecordAnswersQuestion(&rr->resrec, q))
- {
- // SecsSinceRcvd is whole number of elapsed seconds, rounded down
- mDNSu32 SecsSinceRcvd = ((mDNSu32)(m->timenow - rr->TimeRcvd)) / mDNSPlatformOneSecond;
- if (rr->resrec.rroriginalttl <= SecsSinceRcvd)
- {
- LogMsg("AnswerNewQuestion: How is rr->resrec.rroriginalttl %lu <= SecsSinceRcvd %lu for %s %d %d",
- rr->resrec.rroriginalttl, SecsSinceRcvd, CRDisplayString(m, rr), m->timenow, rr->TimeRcvd);
- continue; // Go to next one in loop
- }
-
- // If this record set is marked unique, then that means we can reasonably assume we have the whole set
- // -- we don't need to rush out on the network and query immediately to see if there are more answers out there
- if ((rr->resrec.RecordType & kDNSRecordTypePacketUniqueMask) || (q->ExpectUnique))
- ShouldQueryImmediately = mDNSfalse;
- q->CurrentAnswers++;
- if (rr->resrec.rdlength > SmallRecordLimit) q->LargeAnswers++;
- if (rr->resrec.RecordType & kDNSRecordTypePacketUniqueMask) q->UniqueAnswers++;
- AnsweredFromCache = mDNStrue;
- AnswerCurrentQuestionWithResourceRecord(m, rr, QC_add);
- if (m->CurrentQuestion != q) break; // If callback deleted q, then we're finished here
- }
- else if (RRTypeIsAddressType(rr->resrec.rrtype) && RRTypeIsAddressType(q->qtype))
- ShouldQueryImmediately = mDNSfalse;
- }
- // We don't use LogInfo for this "Question deleted" message because it happens so routinely that
- // it's not remotely remarkable, and therefore unlikely to be of much help tracking down bugs.
- if (m->CurrentQuestion != q) { debugf("AnswerNewQuestion: Question deleted while giving cache answers"); goto exit; }
-
- // Neither a local record nor a cache entry could answer this question. If this question need to be retried
- // with search domains, generate a negative response which will now retry after appending search domains.
- // If the query was suppressed above, we already generated a negative response. When it gets unsuppressed,
- // we will retry with search domains.
- if (!QuerySuppressed(q) && !AnsweredFromCache && q->RetryWithSearchDomains)
- {
- LogInfo("AnswerNewQuestion: Generating response for retrying with search domains %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- GenerateNegativeResponse(m);
- }
-
- if (m->CurrentQuestion != q) { debugf("AnswerNewQuestion: Question deleted while giving negative answer"); goto exit; }
-
- // Note: When a query gets suppressed or retried with search domains, we de-activate the question.
- // Hence we don't execute the following block of code for those cases.
- if (ShouldQueryImmediately && ActiveQuestion(q))
- {
- debugf("AnswerNewQuestion: ShouldQueryImmediately %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- q->ThisQInterval = InitialQuestionInterval;
- q->LastQTime = m->timenow - q->ThisQInterval;
- if (mDNSOpaque16IsZero(q->TargetQID)) // For mDNS, spread packets to avoid a burst of simultaneous queries
- {
- // Compute random delay in the range 1-6 seconds, then divide by 50 to get 20-120ms
- if (!m->RandomQueryDelay)
- m->RandomQueryDelay = (mDNSPlatformOneSecond + mDNSRandom(mDNSPlatformOneSecond*5) - 1) / 50 + 1;
- q->LastQTime += m->RandomQueryDelay;
- }
- }
-
- // IN ALL CASES make sure that m->NextScheduledQuery is set appropriately.
- // In cases where m->NewQuestions->DelayAnswering is set, we may have delayed generating our
- // answers for this question until *after* its scheduled transmission time, in which case
- // m->NextScheduledQuery may now be set to 'never', and in that case -- even though we're *not* doing
- // ShouldQueryImmediately -- we still need to make sure we set m->NextScheduledQuery correctly.
- SetNextQueryTime(m,q);
-
-exit:
- m->CurrentQuestion = mDNSNULL;
- m->lock_rrcache = 0;
- }
-
-// When a NewLocalOnlyQuestion is created, AnswerNewLocalOnlyQuestion runs though our ResourceRecords delivering any
-// appropriate answers, stopping if it reaches a NewLocalOnlyRecord -- these will be handled by AnswerAllLocalQuestionsWithLocalAuthRecord
-mDNSlocal void AnswerNewLocalOnlyQuestion(mDNS *const m)
- {
- mDNSu32 slot;
- AuthGroup *ag;
- DNSQuestion *q = m->NewLocalOnlyQuestions; // Grab the question we're going to answer
- m->NewLocalOnlyQuestions = q->next; // Advance NewLocalOnlyQuestions to the next (if any)
-
- debugf("AnswerNewLocalOnlyQuestion: Answering %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
-
- if (m->CurrentQuestion)
- LogMsg("AnswerNewLocalOnlyQuestion ERROR m->CurrentQuestion already set: %##s (%s)",
- m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype));
- m->CurrentQuestion = q; // Indicate which question we're answering, so we'll know if it gets deleted
-
- if (m->CurrentRecord)
- LogMsg("AnswerNewLocalOnlyQuestion ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord));
-
- // 1. First walk the LocalOnly records answering the LocalOnly question
- // 2. As LocalOnly questions should also be answered by any other Auth records local to the machine,
- // walk the ResourceRecords list delivering the answers
- slot = AuthHashSlot(&q->qname);
- ag = AuthGroupForName(&m->rrauth, slot, q->qnamehash, &q->qname);
- if (ag)
- {
- m->CurrentRecord = ag->members;
- while (m->CurrentRecord && m->CurrentRecord != ag->NewLocalOnlyRecords)
- {
- AuthRecord *rr = m->CurrentRecord;
- m->CurrentRecord = rr->next;
- if (LocalOnlyRecordAnswersQuestion(rr, q))
- {
- AnswerLocalQuestionWithLocalAuthRecord(m, rr, mDNStrue);
- if (m->CurrentQuestion != q) break; // If callback deleted q, then we're finished here
- }
- }
- }
-
- if (m->CurrentQuestion == q)
- {
- m->CurrentRecord = m->ResourceRecords;
-
- while (m->CurrentRecord && m->CurrentRecord != m->NewLocalRecords)
- {
- AuthRecord *rr = m->CurrentRecord;
- m->CurrentRecord = rr->next;
- if (ResourceRecordAnswersQuestion(&rr->resrec, q))
- {
- AnswerLocalQuestionWithLocalAuthRecord(m, rr, mDNStrue);
- if (m->CurrentQuestion != q) break; // If callback deleted q, then we're finished here
- }
- }
- }
-
- m->CurrentQuestion = mDNSNULL;
- m->CurrentRecord = mDNSNULL;
- }
-
-mDNSlocal CacheEntity *GetCacheEntity(mDNS *const m, const CacheGroup *const PreserveCG)
- {
- CacheEntity *e = mDNSNULL;
-
- if (m->lock_rrcache) { LogMsg("GetFreeCacheRR ERROR! Cache already locked!"); return(mDNSNULL); }
- m->lock_rrcache = 1;
-
- // If we have no free records, ask the client layer to give us some more memory
- if (!m->rrcache_free && m->MainCallback)
- {
- if (m->rrcache_totalused != m->rrcache_size)
- LogMsg("GetFreeCacheRR: count mismatch: m->rrcache_totalused %lu != m->rrcache_size %lu",
- m->rrcache_totalused, m->rrcache_size);
-
- // We don't want to be vulnerable to a malicious attacker flooding us with an infinite
- // number of bogus records so that we keep growing our cache until the machine runs out of memory.
- // To guard against this, if our cache grows above 512kB (approx 3168 records at 164 bytes each),
- // and we're actively using less than 1/32 of that cache, then we purge all the unused records
- // and recycle them, instead of allocating more memory.
- if (m->rrcache_size > 5000 && m->rrcache_size / 32 > m->rrcache_active)
- LogInfo("Possible denial-of-service attack in progress: m->rrcache_size %lu; m->rrcache_active %lu",
- m->rrcache_size, m->rrcache_active);
- else
- {
- mDNS_DropLockBeforeCallback(); // Allow client to legally make mDNS API calls from the callback
- m->MainCallback(m, mStatus_GrowCache);
- mDNS_ReclaimLockAfterCallback(); // Decrement mDNS_reentrancy to block mDNS API calls again
- }
- }
-
- // If we still have no free records, recycle all the records we can.
- // Enumerating the entire cache is moderately expensive, so when we do it, we reclaim all the records we can in one pass.
- if (!m->rrcache_free)
- {
- mDNSu32 oldtotalused = m->rrcache_totalused;
- mDNSu32 slot;
- for (slot = 0; slot < CACHE_HASH_SLOTS; slot++)
- {
- CacheGroup **cp = &m->rrcache_hash[slot];
- while (*cp)
- {
- CacheRecord **rp = &(*cp)->members;
- while (*rp)
- {
- // Records that answer still-active questions are not candidates for recycling
- // Records that are currently linked into the CacheFlushRecords list may not be recycled, or we'll crash
- if ((*rp)->CRActiveQuestion || (*rp)->NextInCFList)
- rp=&(*rp)->next;
- else
- {
- CacheRecord *rr = *rp;
- *rp = (*rp)->next; // Cut record from list
- ReleaseCacheRecord(m, rr);
- }
- }
- if ((*cp)->rrcache_tail != rp)
- verbosedebugf("GetFreeCacheRR: Updating rrcache_tail[%lu] from %p to %p", slot, (*cp)->rrcache_tail, rp);
- (*cp)->rrcache_tail = rp;
- if ((*cp)->members || (*cp)==PreserveCG) cp=&(*cp)->next;
- else ReleaseCacheGroup(m, cp);
- }
- }
- LogInfo("GetCacheEntity recycled %d records to reduce cache from %d to %d",
- oldtotalused - m->rrcache_totalused, oldtotalused, m->rrcache_totalused);
- }
-
- if (m->rrcache_free) // If there are records in the free list, take one
- {
- e = m->rrcache_free;
- m->rrcache_free = e->next;
- if (++m->rrcache_totalused >= m->rrcache_report)
- {
- LogInfo("RR Cache now using %ld objects", m->rrcache_totalused);
- if (m->rrcache_report < 100) m->rrcache_report += 10;
- else if (m->rrcache_report < 1000) m->rrcache_report += 100;
- else m->rrcache_report += 1000;
- }
- mDNSPlatformMemZero(e, sizeof(*e));
- }
-
- m->lock_rrcache = 0;
-
- return(e);
- }
-
-mDNSlocal CacheRecord *GetCacheRecord(mDNS *const m, CacheGroup *cg, mDNSu16 RDLength)
- {
- CacheRecord *r = (CacheRecord *)GetCacheEntity(m, cg);
- if (r)
- {
- r->resrec.rdata = (RData*)&r->smallrdatastorage; // By default, assume we're usually going to be using local storage
- if (RDLength > InlineCacheRDSize) // If RDLength is too big, allocate extra storage
- {
- r->resrec.rdata = (RData*)mDNSPlatformMemAllocate(sizeofRDataHeader + RDLength);
- if (r->resrec.rdata) r->resrec.rdata->MaxRDLength = r->resrec.rdlength = RDLength;
- else { ReleaseCacheEntity(m, (CacheEntity*)r); r = mDNSNULL; }
- }
- }
- return(r);
- }
-
-mDNSlocal CacheGroup *GetCacheGroup(mDNS *const m, const mDNSu32 slot, const ResourceRecord *const rr)
- {
- mDNSu16 namelen = DomainNameLength(rr->name);
- CacheGroup *cg = (CacheGroup*)GetCacheEntity(m, mDNSNULL);
- if (!cg) { LogMsg("GetCacheGroup: Failed to allocate memory for %##s", rr->name->c); return(mDNSNULL); }
- cg->next = m->rrcache_hash[slot];
- cg->namehash = rr->namehash;
- cg->members = mDNSNULL;
- cg->rrcache_tail = &cg->members;
- cg->name = (domainname*)cg->namestorage;
- //LogMsg("GetCacheGroup: %-10s %d-byte cache name %##s",
- // (namelen > InlineCacheGroupNameSize) ? "Allocating" : "Inline", namelen, rr->name->c);
- if (namelen > InlineCacheGroupNameSize) cg->name = mDNSPlatformMemAllocate(namelen);
- if (!cg->name)
- {
- LogMsg("GetCacheGroup: Failed to allocate name storage for %##s", rr->name->c);
- ReleaseCacheEntity(m, (CacheEntity*)cg);
- return(mDNSNULL);
- }
- AssignDomainName(cg->name, rr->name);
-
- if (CacheGroupForRecord(m, slot, rr)) LogMsg("GetCacheGroup: Already have CacheGroup for %##s", rr->name->c);
- m->rrcache_hash[slot] = cg;
- if (CacheGroupForRecord(m, slot, rr) != cg) LogMsg("GetCacheGroup: Not finding CacheGroup for %##s", rr->name->c);
-
- return(cg);
- }
-
-mDNSexport void mDNS_PurgeCacheResourceRecord(mDNS *const m, CacheRecord *rr)
- {
- if (m->mDNS_busy != m->mDNS_reentrancy+1)
- LogMsg("mDNS_PurgeCacheResourceRecord: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy);
- // Make sure we mark this record as thoroughly expired -- we don't ever want to give
- // a positive answer using an expired record (e.g. from an interface that has gone away).
- // We don't want to clear CRActiveQuestion here, because that would leave the record subject to
- // summary deletion without giving the proper callback to any questions that are monitoring it.
- // By setting UnansweredQueries to MaxUnansweredQueries we ensure it won't trigger any further expiration queries.
- rr->TimeRcvd = m->timenow - mDNSPlatformOneSecond * 60;
- rr->UnansweredQueries = MaxUnansweredQueries;
- rr->resrec.rroriginalttl = 0;
- SetNextCacheCheckTimeForRecord(m, rr);
- }
-
-mDNSexport mDNSs32 mDNS_TimeNow(const mDNS *const m)
- {
- mDNSs32 time;
- mDNSPlatformLock(m);
- if (m->mDNS_busy)
- {
- LogMsg("mDNS_TimeNow called while holding mDNS lock. This is incorrect. Code protected by lock should just use m->timenow.");
- if (!m->timenow) LogMsg("mDNS_TimeNow: m->mDNS_busy is %ld but m->timenow not set", m->mDNS_busy);
- }
-
- if (m->timenow) time = m->timenow;
- else time = mDNS_TimeNow_NoLock(m);
- mDNSPlatformUnlock(m);
- return(time);
- }
-
-// To avoid pointless CPU thrash, we use SetSPSProxyListChanged(X) to record the last interface that
-// had its Sleep Proxy client list change, and defer to actual BPF reconfiguration to mDNS_Execute().
-// (GetNextScheduledEvent() returns "now" when m->SPSProxyListChanged is set)
-#define SetSPSProxyListChanged(X) do { \
- if (m->SPSProxyListChanged && m->SPSProxyListChanged != (X)) mDNSPlatformUpdateProxyList(m, m->SPSProxyListChanged); \
- m->SPSProxyListChanged = (X); } while(0)
-
-// Called from mDNS_Execute() to expire stale proxy records
-mDNSlocal void CheckProxyRecords(mDNS *const m, AuthRecord *list)
- {
- m->CurrentRecord = list;
- while (m->CurrentRecord)
- {
- AuthRecord *rr = m->CurrentRecord;
- if (rr->resrec.RecordType != kDNSRecordTypeDeregistering && rr->WakeUp.HMAC.l[0])
- {
- // If m->SPSSocket is NULL that means we're not acting as a sleep proxy any more,
- // so we need to cease proxying for *all* records we may have, expired or not.
- if (m->SPSSocket && m->timenow - rr->TimeExpire < 0) // If proxy record not expired yet, update m->NextScheduledSPS
- {
- if (m->NextScheduledSPS - rr->TimeExpire > 0)
- m->NextScheduledSPS = rr->TimeExpire;
- }
- else // else proxy record expired, so remove it
- {
- LogSPS("CheckProxyRecords: Removing %d H-MAC %.6a I-MAC %.6a %d %s",
- m->ProxyRecords, &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, rr->WakeUp.seq, ARDisplayString(m, rr));
- SetSPSProxyListChanged(rr->resrec.InterfaceID);
- mDNS_Deregister_internal(m, rr, mDNS_Dereg_normal);
- // Don't touch rr after this -- memory may have been free'd
- }
- }
- // Mustn't advance m->CurrentRecord until *after* mDNS_Deregister_internal, because
- // new records could have been added to the end of the list as a result of that call.
- if (m->CurrentRecord == rr) // If m->CurrentRecord was not advanced for us, do it now
- m->CurrentRecord = rr->next;
- }
- }
-
-mDNSlocal void CheckRmvEventsForLocalRecords(mDNS *const m)
- {
- while (m->CurrentRecord)
- {
- AuthRecord *rr = m->CurrentRecord;
- if (rr->AnsweredLocalQ && rr->resrec.RecordType == kDNSRecordTypeDeregistering)
- {
- debugf("CheckRmvEventsForLocalRecords: Generating local RMV events for %s", ARDisplayString(m, rr));
- rr->resrec.RecordType = kDNSRecordTypeShared;
- AnswerAllLocalQuestionsWithLocalAuthRecord(m, rr, mDNSfalse);
- if (m->CurrentRecord == rr) // If rr still exists in list, restore its state now
- {
- rr->resrec.RecordType = kDNSRecordTypeDeregistering;
- rr->AnsweredLocalQ = mDNSfalse;
- // SendResponses normally calls CompleteDeregistration after sending goodbyes.
- // For LocalOnly records, we don't do that and hence we need to do that here.
- if (RRLocalOnly(rr)) CompleteDeregistration(m, rr);
- }
- }
- if (m->CurrentRecord == rr) // If m->CurrentRecord was not auto-advanced, do it ourselves now
- m->CurrentRecord = rr->next;
- }
- }
-
-mDNSlocal void TimeoutQuestions(mDNS *const m)
- {
- m->NextScheduledStopTime = m->timenow + 0x3FFFFFFF;
- if (m->CurrentQuestion)
- LogMsg("TimeoutQuestions ERROR m->CurrentQuestion already set: %##s (%s)", m->CurrentQuestion->qname.c,
- DNSTypeName(m->CurrentQuestion->qtype));
- m->CurrentQuestion = m->Questions;
- while (m->CurrentQuestion)
- {
- DNSQuestion *const q = m->CurrentQuestion;
- if (q->StopTime)
- {
- if (m->timenow - q->StopTime >= 0)
- {
- LogInfo("TimeoutQuestions: question %##s timed out, time %d", q->qname.c, m->timenow - q->StopTime);
- GenerateNegativeResponse(m);
- if (m->CurrentQuestion == q) q->StopTime = 0;
- }
- else
- {
- if (m->NextScheduledStopTime - q->StopTime > 0)
- m->NextScheduledStopTime = q->StopTime;
- }
- }
- // If m->CurrentQuestion wasn't modified out from under us, advance it now
- // We can't do this at the start of the loop because GenerateNegativeResponse
- // depends on having m->CurrentQuestion point to the right question
- if (m->CurrentQuestion == q)
- m->CurrentQuestion = q->next;
- }
- m->CurrentQuestion = mDNSNULL;
- }
-
-mDNSexport mDNSs32 mDNS_Execute(mDNS *const m)
- {
- mDNS_Lock(m); // Must grab lock before trying to read m->timenow
-
- if (m->timenow - m->NextScheduledEvent >= 0)
- {
- int i;
- AuthRecord *head, *tail;
- mDNSu32 slot;
- AuthGroup *ag;
-
- verbosedebugf("mDNS_Execute");
-
- if (m->CurrentQuestion)
- LogMsg("mDNS_Execute: ERROR m->CurrentQuestion already set: %##s (%s)",
- m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype));
-
- if (m->CurrentRecord)
- LogMsg("mDNS_Execute: ERROR m->CurrentRecord already set: %s", ARDisplayString(m, m->CurrentRecord));
-
- // 1. If we're past the probe suppression time, we can clear it
- if (m->SuppressProbes && m->timenow - m->SuppressProbes >= 0) m->SuppressProbes = 0;
-
- // 2. If it's been more than ten seconds since the last probe failure, we can clear the counter
- if (m->NumFailedProbes && m->timenow - m->ProbeFailTime >= mDNSPlatformOneSecond * 10) m->NumFailedProbes = 0;
-
- // 3. Purge our cache of stale old records
- if (m->rrcache_size && m->timenow - m->NextCacheCheck >= 0)
- {
- mDNSu32 numchecked = 0;
- m->NextCacheCheck = m->timenow + 0x3FFFFFFF;
- for (slot = 0; slot < CACHE_HASH_SLOTS; slot++)
- {
- if (m->timenow - m->rrcache_nextcheck[slot] >= 0)
- {
- CacheGroup **cp = &m->rrcache_hash[slot];
- m->rrcache_nextcheck[slot] = m->timenow + 0x3FFFFFFF;
- while (*cp)
- {
- debugf("m->NextCacheCheck %4d Slot %3d %##s", numchecked, slot, *cp ? (*cp)->name : (domainname*)"\x04NULL");
- numchecked++;
- CheckCacheExpiration(m, slot, *cp);
- if ((*cp)->members) cp=&(*cp)->next;
- else ReleaseCacheGroup(m, cp);
- }
- }
- // Even if we didn't need to actually check this slot yet, still need to
- // factor its nextcheck time into our overall NextCacheCheck value
- if (m->NextCacheCheck - m->rrcache_nextcheck[slot] > 0)
- m->NextCacheCheck = m->rrcache_nextcheck[slot];
- }
- debugf("m->NextCacheCheck %4d checked, next in %d", numchecked, m->NextCacheCheck - m->timenow);
- }
-
- if (m->timenow - m->NextScheduledSPS >= 0)
- {
- m->NextScheduledSPS = m->timenow + 0x3FFFFFFF;
- CheckProxyRecords(m, m->DuplicateRecords); // Clear m->DuplicateRecords first, then m->ResourceRecords
- CheckProxyRecords(m, m->ResourceRecords);
- }
-
- SetSPSProxyListChanged(mDNSNULL); // Perform any deferred BPF reconfiguration now
-
- // Clear AnnounceOwner if necessary. (Do this *before* SendQueries() and SendResponses().)
- if (m->AnnounceOwner && m->timenow - m->AnnounceOwner >= 0) m->AnnounceOwner = 0;
-
- if (m->DelaySleep && m->timenow - m->DelaySleep >= 0)
- {
- m->DelaySleep = 0;
- if (m->SleepState == SleepState_Transferring)
- {
- LogSPS("Re-sleep delay passed; now checking for Sleep Proxy Servers");
- BeginSleepProcessing(m);
- }
- }
-
- // 4. See if we can answer any of our new local questions from the cache
- for (i=0; m->NewQuestions && i<1000; i++)
- {
- if (m->NewQuestions->DelayAnswering && m->timenow - m->NewQuestions->DelayAnswering < 0) break;
- AnswerNewQuestion(m);
- }
- if (i >= 1000) LogMsg("mDNS_Execute: AnswerNewQuestion exceeded loop limit");
-
- // Make sure we deliver *all* local RMV events, and clear the corresponding rr->AnsweredLocalQ flags, *before*
- // we begin generating *any* new ADD events in the m->NewLocalOnlyQuestions and m->NewLocalRecords loops below.
- for (i=0; i<1000 && m->LocalRemoveEvents; i++)
- {
- m->LocalRemoveEvents = mDNSfalse;
- m->CurrentRecord = m->ResourceRecords;
- CheckRmvEventsForLocalRecords(m);
- // Walk the LocalOnly records and deliver the RMV events
- for (slot = 0; slot < AUTH_HASH_SLOTS; slot++)
- for (ag = m->rrauth.rrauth_hash[slot]; ag; ag = ag->next)
- {
- m->CurrentRecord = ag->members;
- if (m->CurrentRecord) CheckRmvEventsForLocalRecords(m);
- }
- }
-
- if (i >= 1000) LogMsg("mDNS_Execute: m->LocalRemoveEvents exceeded loop limit");
-
- for (i=0; m->NewLocalOnlyQuestions && i<1000; i++) AnswerNewLocalOnlyQuestion(m);
- if (i >= 1000) LogMsg("mDNS_Execute: AnswerNewLocalOnlyQuestion exceeded loop limit");
-
- head = tail = mDNSNULL;
- for (i=0; i<1000 && m->NewLocalRecords && m->NewLocalRecords != head; i++)
- {
- AuthRecord *rr = m->NewLocalRecords;
- m->NewLocalRecords = m->NewLocalRecords->next;
- if (LocalRecordReady(rr))
- {
- debugf("mDNS_Execute: Delivering Add event with LocalAuthRecord %s", ARDisplayString(m, rr));
- AnswerAllLocalQuestionsWithLocalAuthRecord(m, rr, mDNStrue);
- }
- else if (!rr->next)
- {
- // If we have just one record that is not ready, we don't have to unlink and
- // reinsert. As the NewLocalRecords will be NULL for this case, the loop will
- // terminate and set the NewLocalRecords to rr.
- debugf("mDNS_Execute: Just one LocalAuthRecord %s, breaking out of the loop early", ARDisplayString(m, rr));
- if (head != mDNSNULL || m->NewLocalRecords != mDNSNULL)
- LogMsg("mDNS_Execute: ERROR!!: head %p, NewLocalRecords %p", head, m->NewLocalRecords);
-
- head = rr;
- }
- else
- {
- AuthRecord **p = &m->ResourceRecords; // Find this record in our list of active records
- debugf("mDNS_Execute: Skipping LocalAuthRecord %s", ARDisplayString(m, rr));
- // if this is the first record we are skipping, move to the end of the list.
- // if we have already skipped records before, append it at the end.
- while (*p && *p != rr) p=&(*p)->next;
- if (*p) *p = rr->next; // Cut this record from the list
- else { LogMsg("mDNS_Execute: ERROR!! Cannot find record %s in ResourceRecords list", ARDisplayString(m, rr)); break; }
- if (!head)
- {
- while (*p) p=&(*p)->next;
- *p = rr;
- head = tail = rr;
- }
- else
- {
- tail->next = rr;
- tail = rr;
- }
- rr->next = mDNSNULL;
- }
- }
- m->NewLocalRecords = head;
- debugf("mDNS_Execute: Setting NewLocalRecords to %s", (head ? ARDisplayString(m, head) : "NULL"));
-
- if (i >= 1000) LogMsg("mDNS_Execute: m->NewLocalRecords exceeded loop limit");
-
- // Check to see if we have any new LocalOnly/P2P records to examine for delivering
- // to our local questions
- if (m->NewLocalOnlyRecords)
- {
- m->NewLocalOnlyRecords = mDNSfalse;
- for (slot = 0; slot < AUTH_HASH_SLOTS; slot++)
- for (ag = m->rrauth.rrauth_hash[slot]; ag; ag = ag->next)
- {
- for (i=0; i<100 && ag->NewLocalOnlyRecords; i++)
- {
- AuthRecord *rr = ag->NewLocalOnlyRecords;
- ag->NewLocalOnlyRecords = ag->NewLocalOnlyRecords->next;
- // LocalOnly records should always be ready as they never probe
- if (LocalRecordReady(rr))
- {
- debugf("mDNS_Execute: Delivering Add event with LocalAuthRecord %s", ARDisplayString(m, rr));
- AnswerAllLocalQuestionsWithLocalAuthRecord(m, rr, mDNStrue);
- }
- else LogMsg("mDNS_Execute: LocalOnlyRecord %s not ready", ARDisplayString(m, rr));
- }
- // We limit about 100 per AuthGroup that can be serviced at a time
- if (i >= 100) LogMsg("mDNS_Execute: ag->NewLocalOnlyRecords exceeded loop limit");
- }
- }
-
- // 5. Some questions may have picked a new DNS server and the cache may answer these questions now.
- AnswerQuestionsForDNSServerChanges(m);
-
- // 6. See what packets we need to send
- if (m->mDNSPlatformStatus != mStatus_NoError || (m->SleepState == SleepState_Sleeping))
- DiscardDeregistrations(m);
- if (m->mDNSPlatformStatus == mStatus_NoError && (m->SuppressSending == 0 || m->timenow - m->SuppressSending >= 0))
- {
- // If the platform code is ready, and we're not suppressing packet generation right now
- // then send our responses, probes, and questions.
- // We check the cache first, because there might be records close to expiring that trigger questions to refresh them.
- // We send queries next, because there might be final-stage probes that complete their probing here, causing
- // them to advance to announcing state, and we want those to be included in any announcements we send out.
- // Finally, we send responses, including the previously mentioned records that just completed probing.
- m->SuppressSending = 0;
-
- // 7. Send Query packets. This may cause some probing records to advance to announcing state
- if (m->timenow - m->NextScheduledQuery >= 0 || m->timenow - m->NextScheduledProbe >= 0) SendQueries(m);
- if (m->timenow - m->NextScheduledQuery >= 0)
- {
- DNSQuestion *q;
- LogMsg("mDNS_Execute: SendQueries didn't send all its queries (%d - %d = %d) will try again in one second",
- m->timenow, m->NextScheduledQuery, m->timenow - m->NextScheduledQuery);
- m->NextScheduledQuery = m->timenow + mDNSPlatformOneSecond;
- for (q = m->Questions; q && q != m->NewQuestions; q=q->next)
- if (ActiveQuestion(q) && m->timenow - NextQSendTime(q) >= 0)
- LogMsg("mDNS_Execute: SendQueries didn't send %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- }
- if (m->timenow - m->NextScheduledProbe >= 0)
- {
- LogMsg("mDNS_Execute: SendQueries didn't send all its probes (%d - %d = %d) will try again in one second",
- m->timenow, m->NextScheduledProbe, m->timenow - m->NextScheduledProbe);
- m->NextScheduledProbe = m->timenow + mDNSPlatformOneSecond;
- }
-
- // 8. Send Response packets, including probing records just advanced to announcing state
- if (m->timenow - m->NextScheduledResponse >= 0) SendResponses(m);
- if (m->timenow - m->NextScheduledResponse >= 0)
- {
- LogMsg("mDNS_Execute: SendResponses didn't send all its responses; will try again in one second");
- m->NextScheduledResponse = m->timenow + mDNSPlatformOneSecond;
- }
- }
-
- // Clear RandomDelay values, ready to pick a new different value next time
- m->RandomQueryDelay = 0;
- m->RandomReconfirmDelay = 0;
-
- if (m->NextScheduledStopTime && m->timenow - m->NextScheduledStopTime >= 0) TimeoutQuestions(m);
-#ifndef UNICAST_DISABLED
- if (m->NextSRVUpdate && m->timenow - m->NextSRVUpdate >= 0) UpdateAllSRVRecords(m);
- if (m->timenow - m->NextScheduledNATOp >= 0) CheckNATMappings(m);
- if (m->timenow - m->NextuDNSEvent >= 0) uDNS_Tasks(m);
-#endif
- }
-
- // Note about multi-threaded systems:
- // On a multi-threaded system, some other thread could run right after the mDNS_Unlock(),
- // performing mDNS API operations that change our next scheduled event time.
- //
- // On multi-threaded systems (like the current Windows implementation) that have a single main thread
- // calling mDNS_Execute() (and other threads allowed to call mDNS API routines) it is the responsibility
- // of the mDNSPlatformUnlock() routine to signal some kind of stateful condition variable that will
- // signal whatever blocking primitive the main thread is using, so that it will wake up and execute one
- // more iteration of its loop, and immediately call mDNS_Execute() again. The signal has to be stateful
- // in the sense that if the main thread has not yet entered its blocking primitive, then as soon as it
- // does, the state of the signal will be noticed, causing the blocking primitive to return immediately
- // without blocking. This avoids the race condition between the signal from the other thread arriving
- // just *before* or just *after* the main thread enters the blocking primitive.
- //
- // On multi-threaded systems (like the current Mac OS 9 implementation) that are entirely timer-driven,
- // with no main mDNS_Execute() thread, it is the responsibility of the mDNSPlatformUnlock() routine to
- // set the timer according to the m->NextScheduledEvent value, and then when the timer fires, the timer
- // callback function should call mDNS_Execute() (and ignore the return value, which may already be stale
- // by the time it gets to the timer callback function).
-
- mDNS_Unlock(m); // Calling mDNS_Unlock is what gives m->NextScheduledEvent its new value
- return(m->NextScheduledEvent);
- }
-
-mDNSlocal void SuspendLLQs(mDNS *m)
- {
- DNSQuestion *q;
- for (q = m->Questions; q; q = q->next)
- if (ActiveQuestion(q) && !mDNSOpaque16IsZero(q->TargetQID) && q->LongLived && q->state == LLQ_Established)
- { q->ReqLease = 0; sendLLQRefresh(m, q); }
- }
-
-mDNSlocal mDNSBool QuestionHasLocalAnswers(mDNS *const m, DNSQuestion *q)
- {
- AuthRecord *rr;
- mDNSu32 slot;
- AuthGroup *ag;
-
- slot = AuthHashSlot(&q->qname);
- ag = AuthGroupForName(&m->rrauth, slot, q->qnamehash, &q->qname);
- if (ag)
- {
- for (rr = ag->members; rr; rr=rr->next)
- // Filter the /etc/hosts records - LocalOnly, Unique, A/AAAA/CNAME
- if (LORecordAnswersAddressType(rr) && LocalOnlyRecordAnswersQuestion(rr, q))
- {
- LogInfo("QuestionHasLocalAnswers: Question %p %##s (%s) has local answer %s", q, q->qname.c, DNSTypeName(q->qtype), ARDisplayString(m, rr));
- return mDNStrue;
- }
- }
- return mDNSfalse;
- }
-
-// ActivateUnicastQuery() is called from three places:
-// 1. When a new question is created
-// 2. On wake from sleep
-// 3. When the DNS configuration changes
-// In case 1 we don't want to mess with our established ThisQInterval and LastQTime (ScheduleImmediately is false)
-// In cases 2 and 3 we do want to cause the question to be resent immediately (ScheduleImmediately is true)
-mDNSlocal void ActivateUnicastQuery(mDNS *const m, DNSQuestion *const question, mDNSBool ScheduleImmediately)
- {
- // For now this AutoTunnel stuff is specific to Mac OS X.
- // In the future, if there's demand, we may see if we can abstract it out cleanly into the platform layer
-#if APPLE_OSX_mDNSResponder
- // Even though BTMM client tunnels are only useful for AAAA queries, we need to treat v4 and v6 queries equally.
- // Otherwise we can get the situation where the A query completes really fast (with an NXDOMAIN result) and the
- // caller then gives up waiting for the AAAA result while we're still in the process of setting up the tunnel.
- // To level the playing field, we block both A and AAAA queries while tunnel setup is in progress, and then
- // returns results for both at the same time. If we are looking for the _autotunnel6 record, then skip this logic
- // as this would trigger looking up _autotunnel6._autotunnel6 and end up failing the original query.
-
- if (RRTypeIsAddressType(question->qtype) && PrivateQuery(question) &&
- !SameDomainLabel(question->qname.c, (const mDNSu8 *)"\x0c_autotunnel6")&& question->QuestionCallback != AutoTunnelCallback)
- {
- question->NoAnswer = NoAnswer_Suspended;
- AddNewClientTunnel(m, question);
- return;
- }
-#endif // APPLE_OSX_mDNSResponder
-
- if (!question->DuplicateOf)
- {
- debugf("ActivateUnicastQuery: %##s %s%s%s",
- question->qname.c, DNSTypeName(question->qtype), PrivateQuery(question) ? " (Private)" : "", ScheduleImmediately ? " ScheduleImmediately" : "");
- question->CNAMEReferrals = 0;
- if (question->nta) { CancelGetZoneData(m, question->nta); question->nta = mDNSNULL; }
- if (question->LongLived)
- {
- question->state = LLQ_InitialRequest;
- question->id = zeroOpaque64;
- question->servPort = zeroIPPort;
- if (question->tcp) { DisposeTCPConn(question->tcp); question->tcp = mDNSNULL; }
- }
- // If the question has local answers, then we don't want answers from outside
- if (ScheduleImmediately && !QuestionHasLocalAnswers(m, question))
- {
- question->ThisQInterval = InitialQuestionInterval;
- question->LastQTime = m->timenow - question->ThisQInterval;
- SetNextQueryTime(m, question);
- }
- }
- }
-
-// Caller should hold the lock
-mDNSexport void mDNSCoreRestartAddressQueries(mDNS *const m, mDNSBool SearchDomainsChanged, FlushCache flushCacheRecords,
- CallbackBeforeStartQuery BeforeStartCallback, void *context)
- {
- DNSQuestion *q;
- DNSQuestion *restart = mDNSNULL;
-
- if (!m->mDNS_busy) LogMsg("mDNSCoreRestartAddressQueries: ERROR!! Lock not held");
-
- // 1. Flush the cache records
- if (flushCacheRecords) flushCacheRecords(m);
-
- // 2. Even though we may have purged the cache records above, before it can generate RMV event
- // we are going to stop the question. Hence we need to deliver the RMV event before we
- // stop the question.
- //
- // CurrentQuestion is used by RmvEventsForQuestion below. While delivering RMV events, the
- // application callback can potentially stop the current question (detected by CurrentQuestion) or
- // *any* other question which could be the next one that we may process here. RestartQuestion
- // points to the "next" question which will be automatically advanced in mDNS_StopQuery_internal
- // if the "next" question is stopped while the CurrentQuestion is stopped
-
- if (m->RestartQuestion)
- LogMsg("mDNSCoreRestartAddressQueries: ERROR!! m->RestartQuestion already set: %##s (%s)",
- m->RestartQuestion->qname.c, DNSTypeName(m->RestartQuestion->qtype));
-
- m->RestartQuestion = m->Questions;
- while (m->RestartQuestion)
- {
- q = m->RestartQuestion;
- m->RestartQuestion = q->next;
- // GetZoneData questions are referenced by other questions (original query that started the GetZoneData
- // question) through their "nta" pointer. Normally when the original query stops, it stops the
- // GetZoneData question and also frees the memory (See CancelGetZoneData). If we stop the GetZoneData
- // question followed by the original query that refers to this GetZoneData question, we will end up
- // freeing the GetZoneData question and then start the "freed" question at the end.
-
- if (IsGetZoneDataQuestion(q))
- {
- DNSQuestion *refq = q->next;
- LogInfo("mDNSCoreRestartAddressQueries: Skipping GetZoneDataQuestion %p %##s (%s)", q, q->qname.c, DNSTypeName(q->qtype));
- // debug stuff, we just try to find the referencing question and don't do much with it
- while (refq)
- {
- if (q == &refq->nta->question)
- {
- LogInfo("mDNSCoreRestartAddressQueries: Question %p %##s (%s) referring to GetZoneDataQuestion %p, not stopping", refq, refq->qname.c, DNSTypeName(refq->qtype), q);
- }
- refq = refq->next;
- }
- continue;
- }
-
- // This function is called when /etc/hosts changes and that could affect A, AAAA and CNAME queries
- if (q->qtype != kDNSType_A && q->qtype != kDNSType_AAAA && q->qtype != kDNSType_CNAME) continue;
-
- // If the search domains did not change, then we restart all the queries. Otherwise, only
- // for queries for which we "might" have appended search domains ("might" because we may
- // find results before we apply search domains even though AppendSearchDomains is set to 1)
- if (!SearchDomainsChanged || q->AppendSearchDomains)
- {
- // NOTE: CacheRecordRmvEventsForQuestion will not generate RMV events for queries that have non-zero
- // LOAddressAnswers. Hence it is important that we call CacheRecordRmvEventsForQuestion before
- // LocalRecordRmvEventsForQuestion (which decrements LOAddressAnswers). Let us say that
- // /etc/hosts has an A Record for web.apple.com. Any queries for web.apple.com will be answered locally.
- // But this can't prevent a CNAME/AAAA query to not to be sent on the wire. When it is sent on the wire,
- // it could create cache entries. When we are restarting queries, we can't deliver the cache RMV events
- // for the original query using these cache entries as ADDs were never delivered using these cache
- // entries and hence this order is needed.
-
- // If the query is suppressed, the RMV events won't be delivered
- if (!CacheRecordRmvEventsForQuestion(m, q)) { LogInfo("mDNSCoreRestartAddressQueries: Question deleted while delivering Cache Record RMV events"); continue; }
-
- // SuppressQuery status does not affect questions that are answered using local records
- if (!LocalRecordRmvEventsForQuestion(m, q)) { LogInfo("mDNSCoreRestartAddressQueries: Question deleted while delivering Local Record RMV events"); continue; }
-
- LogInfo("mDNSCoreRestartAddressQueries: Stop question %p %##s (%s), AppendSearchDomains %d, qnameOrig %p", q,
- q->qname.c, DNSTypeName(q->qtype), q->AppendSearchDomains, q->qnameOrig);
- mDNS_StopQuery_internal(m, q);
- // Reset state so that it looks like it was in the beginning i.e it should look at /etc/hosts, cache
- // and then search domains should be appended. At the beginning, qnameOrig was NULL.
- if (q->qnameOrig)
- {
- LogInfo("mDNSCoreRestartAddressQueries: qnameOrig %##s", q->qnameOrig);
- AssignDomainName(&q->qname, q->qnameOrig);
- mDNSPlatformMemFree(q->qnameOrig);
- q->qnameOrig = mDNSNULL;
- q->RetryWithSearchDomains = ApplySearchDomainsFirst(q) ? 1 : 0;
- }
- q->SearchListIndex = 0;
- q->next = restart;
- restart = q;
- }
- }
-
- // 3. Callback before we start the query
- if (BeforeStartCallback) BeforeStartCallback(m, context);
-
- // 4. Restart all the stopped queries
- while (restart)
- {
- q = restart;
- restart = restart->next;
- q->next = mDNSNULL;
- LogInfo("mDNSCoreRestartAddressQueries: Start question %p %##s (%s)", q, q->qname.c, DNSTypeName(q->qtype));
- mDNS_StartQuery_internal(m, q);
- }
- }
-
-mDNSexport void mDNSCoreRestartQueries(mDNS *const m)
- {
- DNSQuestion *q;
-
-#ifndef UNICAST_DISABLED
- // Retrigger all our uDNS questions
- if (m->CurrentQuestion)
- LogMsg("mDNSCoreRestartQueries: ERROR m->CurrentQuestion already set: %##s (%s)",
- m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype));
- m->CurrentQuestion = m->Questions;
- while (m->CurrentQuestion)
- {
- q = m->CurrentQuestion;
- m->CurrentQuestion = m->CurrentQuestion->next;
- if (!mDNSOpaque16IsZero(q->TargetQID) && ActiveQuestion(q)) ActivateUnicastQuery(m, q, mDNStrue);
- }
-#endif
-
- // Retrigger all our mDNS questions
- for (q = m->Questions; q; q=q->next) // Scan our list of questions
- if (mDNSOpaque16IsZero(q->TargetQID) && ActiveQuestion(q))
- {
- q->ThisQInterval = InitialQuestionInterval; // MUST be > zero for an active question
- q->RequestUnicast = 2; // Set to 2 because is decremented once *before* we check it
- q->LastQTime = m->timenow - q->ThisQInterval;
- q->RecentAnswerPkts = 0;
- ExpireDupSuppressInfo(q->DupSuppress, m->timenow);
- m->NextScheduledQuery = m->timenow;
- }
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - Power Management (Sleep/Wake)
-#endif
-
-mDNSexport void mDNS_UpdateAllowSleep(mDNS *const m)
- {
-#ifndef IDLESLEEPCONTROL_DISABLED
- mDNSBool allowSleep = mDNStrue;
- char reason[128];
-
- reason[0] = 0;
-
- if (m->SystemSleepOnlyIfWakeOnLAN)
- {
- // Don't sleep if we are a proxy for any services
- if (m->ProxyRecords)
- {
- allowSleep = mDNSfalse;
- mDNS_snprintf(reason, sizeof(reason), "sleep proxy for %d records", m->ProxyRecords);
- LogInfo("Sleep disabled because we are proxying %d records", m->ProxyRecords);
- }
-
- if (allowSleep && mDNSCoreHaveAdvertisedMulticastServices(m))
- {
- // Scan the list of active interfaces
- NetworkInterfaceInfo *intf;
- for (intf = GetFirstActiveInterface(m->HostInterfaces); intf; intf = GetFirstActiveInterface(intf->next))
- {
- if (intf->McastTxRx && !intf->Loopback)
- {
- // Disallow sleep if this interface doesn't support NetWake
- if (!intf->NetWake)
- {
- allowSleep = mDNSfalse;
- mDNS_snprintf(reason, sizeof(reason), "%s does not support NetWake", intf->ifname);
- LogInfo("Sleep disabled because %s does not support NetWake", intf->ifname);
- break;
- }
-
- // Disallow sleep if there is no sleep proxy server
- if (FindSPSInCache1(m, &intf->NetWakeBrowse, mDNSNULL, mDNSNULL) == mDNSNULL)
- {
- allowSleep = mDNSfalse;
- mDNS_snprintf(reason, sizeof(reason), "%s does not support NetWake", intf->ifname);
- LogInfo("Sleep disabled because %s has no sleep proxy", intf->ifname);
- break;
- }
- }
- }
- }
- }
-
- // Call the platform code to enable/disable sleep
- mDNSPlatformSetAllowSleep(m, allowSleep, reason);
-#endif /* !defined(IDLESLEEPCONTROL_DISABLED) */
- }
-
-mDNSlocal void SendSPSRegistrationForOwner(mDNS *const m, NetworkInterfaceInfo *const intf, const mDNSOpaque16 id, const OwnerOptData *const owner)
- {
- const int optspace = DNSOpt_Header_Space + DNSOpt_LeaseData_Space + DNSOpt_Owner_Space(&m->PrimaryMAC, &intf->MAC);
- const int sps = intf->NextSPSAttempt / 3;
- AuthRecord *rr;
-
- if (!intf->SPSAddr[sps].type)
- {
- intf->NextSPSAttemptTime = m->timenow + mDNSPlatformOneSecond;
- if (m->NextScheduledSPRetry - intf->NextSPSAttemptTime > 0)
- m->NextScheduledSPRetry = intf->NextSPSAttemptTime;
- LogSPS("SendSPSRegistration: %s SPS %d (%d) %##s not yet resolved", intf->ifname, intf->NextSPSAttempt, sps, intf->NetWakeResolve[sps].qname.c);
- goto exit;
- }
-
- // Mark our mDNS records (not unicast records) for transfer to SPS
- if (mDNSOpaque16IsZero(id))
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- if (rr->resrec.RecordType > kDNSRecordTypeDeregistering)
- if (rr->resrec.InterfaceID == intf->InterfaceID || (!rr->resrec.InterfaceID && (rr->ForceMCast || IsLocalDomain(rr->resrec.name))))
- if (mDNSPlatformMemSame(owner, &rr->WakeUp, sizeof(*owner)))
- rr->SendRNow = mDNSInterfaceMark; // mark it now
-
- while (1)
- {
- mDNSu8 *p = m->omsg.data;
- // To comply with RFC 2782, PutResourceRecord suppresses name compression for SRV records in unicast updates.
- // For now we follow that same logic for SPS registrations too.
- // If we decide to compress SRV records in SPS registrations in the future, we can achieve that by creating our
- // initial DNSMessage with h.flags set to zero, and then update it to UpdateReqFlags right before sending the packet.
- InitializeDNSMessage(&m->omsg.h, mDNSOpaque16IsZero(id) ? mDNS_NewMessageID(m) : id, UpdateReqFlags);
-
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- if (rr->SendRNow || (!mDNSOpaque16IsZero(id) && !AuthRecord_uDNS(rr) && mDNSSameOpaque16(rr->updateid, id) && m->timenow - (rr->LastAPTime + rr->ThisAPInterval) >= 0))
- if (mDNSPlatformMemSame(owner, &rr->WakeUp, sizeof(*owner)))
- {
- mDNSu8 *newptr;
- const mDNSu8 *const limit = m->omsg.data + (m->omsg.h.mDNS_numUpdates ? NormalMaxDNSMessageData : AbsoluteMaxDNSMessageData) - optspace;
- if (rr->resrec.RecordType & kDNSRecordTypeUniqueMask)
- rr->resrec.rrclass |= kDNSClass_UniqueRRSet; // Temporarily set the 'unique' bit so PutResourceRecord will set it
- newptr = PutResourceRecordTTLWithLimit(&m->omsg, p, &m->omsg.h.mDNS_numUpdates, &rr->resrec, rr->resrec.rroriginalttl, limit);
- rr->resrec.rrclass &= ~kDNSClass_UniqueRRSet; // Make sure to clear 'unique' bit back to normal state
- if (!newptr)
- LogSPS("SendSPSRegistration put %s FAILED %d/%d %s", intf->ifname, p - m->omsg.data, limit - m->omsg.data, ARDisplayString(m, rr));
- else
- {
- LogSPS("SendSPSRegistration put %s %s", intf->ifname, ARDisplayString(m, rr));
- rr->SendRNow = mDNSNULL;
- rr->ThisAPInterval = mDNSPlatformOneSecond;
- rr->LastAPTime = m->timenow;
- rr->updateid = m->omsg.h.id;
- if (m->NextScheduledResponse - (rr->LastAPTime + rr->ThisAPInterval) >= 0)
- m->NextScheduledResponse = (rr->LastAPTime + rr->ThisAPInterval);
- p = newptr;
- }
- }
-
- if (!m->omsg.h.mDNS_numUpdates) break;
- else
- {
- AuthRecord opt;
- mDNS_SetupResourceRecord(&opt, mDNSNULL, mDNSInterface_Any, kDNSType_OPT, kStandardTTL, kDNSRecordTypeKnownUnique, AuthRecordAny, mDNSNULL, mDNSNULL);
- opt.resrec.rrclass = NormalMaxDNSMessageData;
- opt.resrec.rdlength = sizeof(rdataOPT) * 2; // Two options in this OPT record
- opt.resrec.rdestimate = sizeof(rdataOPT) * 2;
- opt.resrec.rdata->u.opt[0].opt = kDNSOpt_Lease;
- opt.resrec.rdata->u.opt[0].optlen = DNSOpt_LeaseData_Space - 4;
- opt.resrec.rdata->u.opt[0].u.updatelease = DEFAULT_UPDATE_LEASE;
- if (!owner->HMAC.l[0]) // If no owner data,
- SetupOwnerOpt(m, intf, &opt.resrec.rdata->u.opt[1]); // use our own interface information
- else // otherwise, use the owner data we were given
- {
- opt.resrec.rdata->u.opt[1].u.owner = *owner;
- opt.resrec.rdata->u.opt[1].opt = kDNSOpt_Owner;
- opt.resrec.rdata->u.opt[1].optlen = DNSOpt_Owner_Space(&owner->HMAC, &owner->IMAC) - 4;
- }
- LogSPS("SendSPSRegistration put %s %s", intf->ifname, ARDisplayString(m, &opt));
- p = PutResourceRecordTTLWithLimit(&m->omsg, p, &m->omsg.h.numAdditionals, &opt.resrec, opt.resrec.rroriginalttl, m->omsg.data + AbsoluteMaxDNSMessageData);
- if (!p)
- LogMsg("SendSPSRegistration: Failed to put OPT record (%d updates) %s", m->omsg.h.mDNS_numUpdates, ARDisplayString(m, &opt));
- else
- {
- mStatus err;
-
- LogSPS("SendSPSRegistration: Sending Update %s %d (%d) id %5d with %d records %d bytes to %#a:%d", intf->ifname, intf->NextSPSAttempt, sps,
- mDNSVal16(m->omsg.h.id), m->omsg.h.mDNS_numUpdates, p - m->omsg.data, &intf->SPSAddr[sps], mDNSVal16(intf->SPSPort[sps]));
- // if (intf->NextSPSAttempt < 5) m->omsg.h.flags = zeroID; // For simulating packet loss
- err = mDNSSendDNSMessage(m, &m->omsg, p, intf->InterfaceID, mDNSNULL, &intf->SPSAddr[sps], intf->SPSPort[sps], mDNSNULL, mDNSNULL);
- if (err) LogSPS("SendSPSRegistration: mDNSSendDNSMessage err %d", err);
- if (err && intf->SPSAddr[sps].type == mDNSAddrType_IPv6 && intf->NetWakeResolve[sps].ThisQInterval == -1)
- {
- LogSPS("SendSPSRegistration %d %##s failed to send to IPv6 address; will try IPv4 instead", sps, intf->NetWakeResolve[sps].qname.c);
- intf->NetWakeResolve[sps].qtype = kDNSType_A;
- mDNS_StartQuery_internal(m, &intf->NetWakeResolve[sps]);
- return;
- }
- }
- }
- }
-
- intf->NextSPSAttemptTime = m->timenow + mDNSPlatformOneSecond * 10; // If successful, update NextSPSAttemptTime
-
-exit:
- if (mDNSOpaque16IsZero(id) && intf->NextSPSAttempt < 8) intf->NextSPSAttempt++;
- }
-
-mDNSlocal mDNSBool RecordIsFirstOccurrenceOfOwner(mDNS *const m, const AuthRecord *const rr)
- {
- AuthRecord *ar;
- for (ar = m->ResourceRecords; ar && ar != rr; ar=ar->next)
- if (mDNSPlatformMemSame(&rr->WakeUp, &ar->WakeUp, sizeof(rr->WakeUp))) return mDNSfalse;
- return mDNStrue;
- }
-
-mDNSlocal void SendSPSRegistration(mDNS *const m, NetworkInterfaceInfo *const intf, const mDNSOpaque16 id)
- {
- AuthRecord *ar;
- OwnerOptData owner = zeroOwner;
-
- SendSPSRegistrationForOwner(m, intf, id, &owner);
-
- for (ar = m->ResourceRecords; ar; ar=ar->next)
- {
- if (!mDNSPlatformMemSame(&owner, &ar->WakeUp, sizeof(owner)) && RecordIsFirstOccurrenceOfOwner(m, ar))
- {
- owner = ar->WakeUp;
- SendSPSRegistrationForOwner(m, intf, id, &owner);
- }
- }
- }
-
-// RetrySPSRegistrations is called from SendResponses, with the lock held
-mDNSlocal void RetrySPSRegistrations(mDNS *const m)
- {
- AuthRecord *rr;
- NetworkInterfaceInfo *intf;
-
- // First make sure none of our interfaces' NextSPSAttemptTimes are inadvertently set to m->timenow + mDNSPlatformOneSecond * 10
- for (intf = GetFirstActiveInterface(m->HostInterfaces); intf; intf = GetFirstActiveInterface(intf->next))
- if (intf->NextSPSAttempt && intf->NextSPSAttemptTime == m->timenow + mDNSPlatformOneSecond * 10)
- intf->NextSPSAttemptTime++;
-
- // Retry any record registrations that are due
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- if (!AuthRecord_uDNS(rr) && !mDNSOpaque16IsZero(rr->updateid) && m->timenow - (rr->LastAPTime + rr->ThisAPInterval) >= 0)
- for (intf = GetFirstActiveInterface(m->HostInterfaces); intf; intf = GetFirstActiveInterface(intf->next))
- if (!rr->resrec.InterfaceID || rr->resrec.InterfaceID == intf->InterfaceID)
- {
- LogSPS("RetrySPSRegistrations: %s", ARDisplayString(m, rr));
- SendSPSRegistration(m, intf, rr->updateid);
- }
-
- // For interfaces where we did an SPS registration attempt, increment intf->NextSPSAttempt
- for (intf = GetFirstActiveInterface(m->HostInterfaces); intf; intf = GetFirstActiveInterface(intf->next))
- if (intf->NextSPSAttempt && intf->NextSPSAttemptTime == m->timenow + mDNSPlatformOneSecond * 10 && intf->NextSPSAttempt < 8)
- intf->NextSPSAttempt++;
- }
-
-mDNSlocal void NetWakeResolve(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord)
- {
- NetworkInterfaceInfo *intf = (NetworkInterfaceInfo *)question->QuestionContext;
- int sps = (int)(question - intf->NetWakeResolve);
- (void)m; // Unused
- LogSPS("NetWakeResolve: SPS: %d Add: %d %s", sps, AddRecord, RRDisplayString(m, answer));
-
- if (!AddRecord) return; // Don't care about REMOVE events
- if (answer->rrtype != question->qtype) return; // Don't care about CNAMEs
-
- // if (answer->rrtype == kDNSType_AAAA && sps == 0) return; // To test failing to resolve sleep proxy's address
-
- if (answer->rrtype == kDNSType_SRV)
- {
- // 1. Got the SRV record; now look up the target host's IPv6 link-local address
- mDNS_StopQuery(m, question);
- intf->SPSPort[sps] = answer->rdata->u.srv.port;
- AssignDomainName(&question->qname, &answer->rdata->u.srv.target);
- question->qtype = kDNSType_AAAA;
- mDNS_StartQuery(m, question);
- }
- else if (answer->rrtype == kDNSType_AAAA && answer->rdlength == sizeof(mDNSv6Addr) && mDNSv6AddressIsLinkLocal(&answer->rdata->u.ipv6))
- {
- // 2. Got the target host's IPv6 link-local address; record address and initiate an SPS registration if appropriate
- mDNS_StopQuery(m, question);
- question->ThisQInterval = -1;
- intf->SPSAddr[sps].type = mDNSAddrType_IPv6;
- intf->SPSAddr[sps].ip.v6 = answer->rdata->u.ipv6;
- mDNS_Lock(m);
- if (sps == intf->NextSPSAttempt/3) SendSPSRegistration(m, intf, zeroID); // If we're ready for this result, use it now
- mDNS_Unlock(m);
- }
- else if (answer->rrtype == kDNSType_AAAA && answer->rdlength == 0)
- {
- // 3. Got negative response -- target host apparently has IPv6 disabled -- so try looking up the target host's IPv4 address(es) instead
- mDNS_StopQuery(m, question);
- LogSPS("NetWakeResolve: SPS %d %##s has no IPv6 address, will try IPv4 instead", sps, question->qname.c);
- question->qtype = kDNSType_A;
- mDNS_StartQuery(m, question);
- }
- else if (answer->rrtype == kDNSType_A && answer->rdlength == sizeof(mDNSv4Addr))
- {
- // 4. Got an IPv4 address for the target host; record address and initiate an SPS registration if appropriate
- mDNS_StopQuery(m, question);
- question->ThisQInterval = -1;
- intf->SPSAddr[sps].type = mDNSAddrType_IPv4;
- intf->SPSAddr[sps].ip.v4 = answer->rdata->u.ipv4;
- mDNS_Lock(m);
- if (sps == intf->NextSPSAttempt/3) SendSPSRegistration(m, intf, zeroID); // If we're ready for this result, use it now
- mDNS_Unlock(m);
- }
- }
-
-mDNSexport mDNSBool mDNSCoreHaveAdvertisedMulticastServices(mDNS *const m)
- {
- AuthRecord *rr;
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- if (rr->resrec.rrtype == kDNSType_SRV && !AuthRecord_uDNS(rr) && !mDNSSameIPPort(rr->resrec.rdata->u.srv.port, DiscardPort))
- return mDNStrue;
- return mDNSfalse;
- }
-
-mDNSlocal void SendSleepGoodbyes(mDNS *const m)
- {
- AuthRecord *rr;
- m->SleepState = SleepState_Sleeping;
-
-#ifndef UNICAST_DISABLED
- SleepRecordRegistrations(m); // If we have no SPS, need to deregister our uDNS records
-#endif /* UNICAST_DISABLED */
-
- // Mark all the records we need to deregister and send them
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- if (rr->resrec.RecordType == kDNSRecordTypeShared && rr->RequireGoodbye)
- rr->ImmedAnswer = mDNSInterfaceMark;
- SendResponses(m);
- }
-
-// BeginSleepProcessing is called, with the lock held, from either mDNS_Execute or mDNSCoreMachineSleep
-mDNSlocal void BeginSleepProcessing(mDNS *const m)
- {
- mDNSBool SendGoodbyes = mDNStrue;
- const CacheRecord *sps[3] = { mDNSNULL };
-
- m->NextScheduledSPRetry = m->timenow;
-
- if (!m->SystemWakeOnLANEnabled) LogSPS("BeginSleepProcessing: m->SystemWakeOnLANEnabled is false");
- else if (!mDNSCoreHaveAdvertisedMulticastServices(m)) LogSPS("BeginSleepProcessing: No advertised services");
- else // If we have at least one advertised service
- {
- NetworkInterfaceInfo *intf;
- for (intf = GetFirstActiveInterface(m->HostInterfaces); intf; intf = GetFirstActiveInterface(intf->next))
- {
- if (!intf->NetWake) LogSPS("BeginSleepProcessing: %-6s not capable of magic packet wakeup", intf->ifname);
-#if APPLE_OSX_mDNSResponder
- else if (ActivateLocalProxy(m, intf->ifname) == mStatus_NoError)
- {
- SendGoodbyes = mDNSfalse;
- LogSPS("BeginSleepProcessing: %-6s using local proxy", intf->ifname);
- // This will leave m->SleepState set to SleepState_Transferring,
- // which is okay because with no outstanding resolves, or updates in flight,
- // mDNSCoreReadyForSleep() will conclude correctly that all the updates have already completed
- }
-#endif // APPLE_OSX_mDNSResponder
- else
- {
- FindSPSInCache(m, &intf->NetWakeBrowse, sps);
- if (!sps[0]) LogSPS("BeginSleepProcessing: %-6s %#a No Sleep Proxy Server found (Next Browse Q in %d, interval %d)",
- intf->ifname, &intf->ip, NextQSendTime(&intf->NetWakeBrowse) - m->timenow, intf->NetWakeBrowse.ThisQInterval);
- else
- {
- int i;
- SendGoodbyes = mDNSfalse;
- intf->NextSPSAttempt = 0;
- intf->NextSPSAttemptTime = m->timenow + mDNSPlatformOneSecond;
- // Don't need to set m->NextScheduledSPRetry here because we already set "m->NextScheduledSPRetry = m->timenow" above
- for (i=0; i<3; i++)
- {
-#if ForceAlerts
- if (intf->SPSAddr[i].type)
- { LogMsg("BeginSleepProcessing: %s %d intf->SPSAddr[i].type %d", intf->ifname, i, intf->SPSAddr[i].type); *(long*)0 = 0; }
- if (intf->NetWakeResolve[i].ThisQInterval >= 0)
- { LogMsg("BeginSleepProcessing: %s %d intf->NetWakeResolve[i].ThisQInterval %d", intf->ifname, i, intf->NetWakeResolve[i].ThisQInterval); *(long*)0 = 0; }
-#endif
- intf->SPSAddr[i].type = mDNSAddrType_None;
- if (intf->NetWakeResolve[i].ThisQInterval >= 0) mDNS_StopQuery(m, &intf->NetWakeResolve[i]);
- intf->NetWakeResolve[i].ThisQInterval = -1;
- if (sps[i])
- {
- LogSPS("BeginSleepProcessing: %-6s Found Sleep Proxy Server %d TTL %d %s", intf->ifname, i, sps[i]->resrec.rroriginalttl, CRDisplayString(m, sps[i]));
- mDNS_SetupQuestion(&intf->NetWakeResolve[i], intf->InterfaceID, &sps[i]->resrec.rdata->u.name, kDNSType_SRV, NetWakeResolve, intf);
- intf->NetWakeResolve[i].ReturnIntermed = mDNStrue;
- mDNS_StartQuery_internal(m, &intf->NetWakeResolve[i]);
- }
- }
- }
- }
- }
- }
-
- if (SendGoodbyes) // If we didn't find even one Sleep Proxy
- {
- LogSPS("BeginSleepProcessing: Not registering with Sleep Proxy Server");
- SendSleepGoodbyes(m);
- }
- }
-
-// Call mDNSCoreMachineSleep(m, mDNStrue) when the machine is about to go to sleep.
-// Call mDNSCoreMachineSleep(m, mDNSfalse) when the machine is has just woken up.
-// Normally, the platform support layer below mDNSCore should call this, not the client layer above.
-mDNSexport void mDNSCoreMachineSleep(mDNS *const m, mDNSBool sleep)
- {
- AuthRecord *rr;
-
- LogSPS("%s (old state %d) at %ld", sleep ? "Sleeping" : "Waking", m->SleepState, m->timenow);
-
- if (sleep && !m->SleepState) // Going to sleep
- {
- mDNS_Lock(m);
- // If we're going to sleep, need to stop advertising that we're a Sleep Proxy Server
- if (m->SPSSocket)
- {
- mDNSu8 oldstate = m->SPSState;
- mDNS_DropLockBeforeCallback(); // mDNS_DeregisterService expects to be called without the lock held, so we emulate that here
- m->SPSState = 2;
- if (oldstate == 1) mDNS_DeregisterService(m, &m->SPSRecords);
- mDNS_ReclaimLockAfterCallback();
- }
-
- m->SleepState = SleepState_Transferring;
- if (m->SystemWakeOnLANEnabled && m->DelaySleep)
- {
- // If we just woke up moments ago, allow ten seconds for networking to stabilize before going back to sleep
- LogSPS("mDNSCoreMachineSleep: Re-sleeping immediately after waking; will delay for %d ticks", m->DelaySleep - m->timenow);
- m->SleepLimit = NonZeroTime(m->DelaySleep + mDNSPlatformOneSecond * 10);
- }
- else
- {
- m->DelaySleep = 0;
- m->SleepLimit = NonZeroTime(m->timenow + mDNSPlatformOneSecond * 10);
- BeginSleepProcessing(m);
- }
-
-#ifndef UNICAST_DISABLED
- SuspendLLQs(m);
-#endif
- mDNS_Unlock(m);
- // RemoveAutoTunnel6Record needs to be called outside the lock, as it grabs the lock also.
-#if APPLE_OSX_mDNSResponder
- RemoveAutoTunnel6Record(m);
-#endif
- LogSPS("mDNSCoreMachineSleep: m->SleepState %d (%s) seq %d", m->SleepState,
- m->SleepState == SleepState_Transferring ? "Transferring" :
- m->SleepState == SleepState_Sleeping ? "Sleeping" : "?", m->SleepSeqNum);
- }
- else if (!sleep) // Waking up
- {
- mDNSu32 slot;
- CacheGroup *cg;
- CacheRecord *cr;
- NetworkInterfaceInfo *intf;
-
- mDNS_Lock(m);
- // Reset SleepLimit back to 0 now that we're awake again.
- m->SleepLimit = 0;
-
- // If we were previously sleeping, but now we're not, increment m->SleepSeqNum to indicate that we're entering a new period of wakefulness
- if (m->SleepState != SleepState_Awake)
- {
- m->SleepState = SleepState_Awake;
- m->SleepSeqNum++;
- // If the machine wakes and then immediately tries to sleep again (e.g. a maintenance wake)
- // then we enforce a minimum delay of 16 seconds before we begin sleep processing.
- // This is to allow time for the Ethernet link to come up, DHCP to get an address, mDNS to issue queries, etc.,
- // before we make our determination of whether there's a Sleep Proxy out there we should register with.
- m->DelaySleep = NonZeroTime(m->timenow + mDNSPlatformOneSecond * 16);
- }
-
- if (m->SPSState == 3)
- {
- m->SPSState = 0;
- mDNSCoreBeSleepProxyServer_internal(m, m->SPSType, m->SPSPortability, m->SPSMarginalPower, m->SPSTotalPower);
- }
-
- // In case we gave up waiting and went to sleep before we got an ack from the Sleep Proxy,
- // on wake we go through our record list and clear updateid back to zero
- for (rr = m->ResourceRecords; rr; rr=rr->next) rr->updateid = zeroID;
-
- // ... and the same for NextSPSAttempt
- for (intf = GetFirstActiveInterface(m->HostInterfaces); intf; intf = GetFirstActiveInterface(intf->next)) intf->NextSPSAttempt = -1;
-
- // Restart unicast and multicast queries
- mDNSCoreRestartQueries(m);
-
- // and reactivtate service registrations
- m->NextSRVUpdate = NonZeroTime(m->timenow + mDNSPlatformOneSecond);
- LogInfo("mDNSCoreMachineSleep waking: NextSRVUpdate in %d %d", m->NextSRVUpdate - m->timenow, m->timenow);
-
- // 2. Re-validate our cache records
- FORALL_CACHERECORDS(slot, cg, cr)
- mDNS_Reconfirm_internal(m, cr, kDefaultReconfirmTimeForWake);
-
- // 3. Retrigger probing and announcing for all our authoritative records
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- if (AuthRecord_uDNS(rr))
- {
- ActivateUnicastRegistration(m, rr);
- }
- else
- {
- if (rr->resrec.RecordType == kDNSRecordTypeVerified && !rr->DependentOn) rr->resrec.RecordType = kDNSRecordTypeUnique;
- rr->ProbeCount = DefaultProbeCountForRecordType(rr->resrec.RecordType);
- rr->AnnounceCount = InitialAnnounceCount;
- rr->SendNSECNow = mDNSNULL;
- InitializeLastAPTime(m, rr);
- }
-
- // 4. Refresh NAT mappings
- // We don't want to have to assume that all hardware can necessarily keep accurate
- // track of passage of time while asleep, so on wake we refresh our NAT mappings
- // We typically wake up with no interfaces active, so there's no need to rush to try to find our external address.
- // When we get a network configuration change, mDNSMacOSXNetworkChanged calls uDNS_SetupDNSConfig, which calls
- // mDNS_SetPrimaryInterfaceInfo, which then sets m->retryGetAddr to immediately request our external address from the NAT gateway.
- m->retryIntervalGetAddr = NATMAP_INIT_RETRY;
- m->retryGetAddr = m->timenow + mDNSPlatformOneSecond * 5;
- LogInfo("mDNSCoreMachineSleep: retryGetAddr in %d %d", m->retryGetAddr - m->timenow, m->timenow);
- RecreateNATMappings(m);
- mDNS_Unlock(m);
- }
- }
-
-mDNSexport mDNSBool mDNSCoreReadyForSleep(mDNS *m, mDNSs32 now)
- {
- DNSQuestion *q;
- AuthRecord *rr;
- NetworkInterfaceInfo *intf;
-
- mDNS_Lock(m);
-
- if (m->DelaySleep) goto notready;
-
- // If we've not hit the sleep limit time, and it's not time for our next retry, we can skip these checks
- if (m->SleepLimit - now > 0 && m->NextScheduledSPRetry - now > 0) goto notready;
-
- m->NextScheduledSPRetry = now + 0x40000000UL;
-
- // See if we might need to retransmit any lost Sleep Proxy Registrations
- for (intf = GetFirstActiveInterface(m->HostInterfaces); intf; intf = GetFirstActiveInterface(intf->next))
- if (intf->NextSPSAttempt >= 0)
- {
- if (now - intf->NextSPSAttemptTime >= 0)
- {
- LogSPS("mDNSCoreReadyForSleep: retrying for %s SPS %d try %d",
- intf->ifname, intf->NextSPSAttempt/3, intf->NextSPSAttempt);
- SendSPSRegistration(m, intf, zeroID);
- // Don't need to "goto notready" here, because if we do still have record registrations
- // that have not been acknowledged yet, we'll catch that in the record list scan below.
- }
- else
- if (m->NextScheduledSPRetry - intf->NextSPSAttemptTime > 0)
- m->NextScheduledSPRetry = intf->NextSPSAttemptTime;
- }
-
- // Scan list of interfaces, and see if we're still waiting for any sleep proxy resolves to complete
- for (intf = GetFirstActiveInterface(m->HostInterfaces); intf; intf = GetFirstActiveInterface(intf->next))
- {
- int sps = (intf->NextSPSAttempt == 0) ? 0 : (intf->NextSPSAttempt-1)/3;
- if (intf->NetWakeResolve[sps].ThisQInterval >= 0)
- {
- LogSPS("mDNSCoreReadyForSleep: waiting for SPS Resolve %s %##s (%s)",
- intf->ifname, intf->NetWakeResolve[sps].qname.c, DNSTypeName(intf->NetWakeResolve[sps].qtype));
- goto spsnotready;
- }
- }
-
- // Scan list of registered records
- for (rr = m->ResourceRecords; rr; rr = rr->next)
- if (!AuthRecord_uDNS(rr))
- if (!mDNSOpaque16IsZero(rr->updateid))
- { LogSPS("mDNSCoreReadyForSleep: waiting for SPS Update ID %d %s", mDNSVal16(rr->updateid), ARDisplayString(m,rr)); goto spsnotready; }
-
- // Scan list of private LLQs, and make sure they've all completed their handshake with the server
- for (q = m->Questions; q; q = q->next)
- if (!mDNSOpaque16IsZero(q->TargetQID) && q->LongLived && q->ReqLease == 0 && q->tcp)
- {
- LogSPS("mDNSCoreReadyForSleep: waiting for LLQ %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- goto notready;
- }
-
- // Scan list of registered records
- for (rr = m->ResourceRecords; rr; rr = rr->next)
- if (AuthRecord_uDNS(rr))
- {
- if (rr->state == regState_Refresh && rr->tcp)
- { LogSPS("mDNSCoreReadyForSleep: waiting for Record Update ID %d %s", mDNSVal16(rr->updateid), ARDisplayString(m,rr)); goto notready; }
- #if APPLE_OSX_mDNSResponder
- if (!RecordReadyForSleep(m, rr)) { LogSPS("mDNSCoreReadyForSleep: waiting for %s", ARDisplayString(m, rr)); goto notready; }
- #endif
- }
-
- mDNS_Unlock(m);
- return mDNStrue;
-
-spsnotready:
-
- // If we failed to complete sleep proxy registration within ten seconds, we give up on that
- // and allow up to ten seconds more to complete wide-area deregistration instead
- if (now - m->SleepLimit >= 0)
- {
- LogMsg("Failed to register with SPS, now sending goodbyes");
-
- for (intf = GetFirstActiveInterface(m->HostInterfaces); intf; intf = GetFirstActiveInterface(intf->next))
- if (intf->NetWakeBrowse.ThisQInterval >= 0)
- {
- LogSPS("ReadyForSleep mDNS_DeactivateNetWake %s %##s (%s)",
- intf->ifname, intf->NetWakeResolve[0].qname.c, DNSTypeName(intf->NetWakeResolve[0].qtype));
- mDNS_DeactivateNetWake_internal(m, intf);
- }
-
- for (rr = m->ResourceRecords; rr; rr = rr->next)
- if (!AuthRecord_uDNS(rr))
- if (!mDNSOpaque16IsZero(rr->updateid))
- {
- LogSPS("ReadyForSleep clearing updateid for %s", ARDisplayString(m, rr));
- rr->updateid = zeroID;
- }
-
- // We'd really like to allow up to ten seconds more here,
- // but if we don't respond to the sleep notification within 30 seconds
- // we'll be put back to sleep forcibly without the chance to schedule the next maintenance wake.
- // Right now we wait 16 sec after wake for all the interfaces to come up, then we wait up to 10 seconds
- // more for SPS resolves and record registrations to complete, which puts us at 26 seconds.
- // If we allow just one more second to send our goodbyes, that puts us at 27 seconds.
- m->SleepLimit = now + mDNSPlatformOneSecond * 1;
-
- SendSleepGoodbyes(m);
- }
-
-notready:
- mDNS_Unlock(m);
- return mDNSfalse;
- }
-
-mDNSexport mDNSs32 mDNSCoreIntervalToNextWake(mDNS *const m, mDNSs32 now)
- {
- AuthRecord *ar;
-
- // Even when we have no wake-on-LAN-capable interfaces, or we failed to find a sleep proxy, or we have other
- // failure scenarios, we still want to wake up in at most 120 minutes, to see if the network environment has changed.
- // E.g. we might wake up and find no wireless network because the base station got rebooted just at that moment,
- // and if that happens we don't want to just give up and go back to sleep and never try again.
- mDNSs32 e = now + (120 * 60 * mDNSPlatformOneSecond); // Sleep for at most 120 minutes
-
- NATTraversalInfo *nat;
- for (nat = m->NATTraversals; nat; nat=nat->next)
- if (nat->Protocol && nat->ExpiryTime && nat->ExpiryTime - now > mDNSPlatformOneSecond*4)
- {
- mDNSs32 t = nat->ExpiryTime - (nat->ExpiryTime - now) / 10; // Wake up when 90% of the way to the expiry time
- if (e - t > 0) e = t;
- LogSPS("ComputeWakeTime: %p %s Int %5d Ext %5d Err %d Retry %5d Interval %5d Expire %5d Wake %5d",
- nat, nat->Protocol == NATOp_MapTCP ? "TCP" : "UDP",
- mDNSVal16(nat->IntPort), mDNSVal16(nat->ExternalPort), nat->Result,
- nat->retryPortMap ? (nat->retryPortMap - now) / mDNSPlatformOneSecond : 0,
- nat->retryInterval / mDNSPlatformOneSecond,
- nat->ExpiryTime ? (nat->ExpiryTime - now) / mDNSPlatformOneSecond : 0,
- (t - now) / mDNSPlatformOneSecond);
- }
-
- // This loop checks both the time we need to renew wide-area registrations,
- // and the time we need to renew Sleep Proxy registrations
- for (ar = m->ResourceRecords; ar; ar = ar->next)
- if (ar->expire && ar->expire - now > mDNSPlatformOneSecond*4)
- {
- mDNSs32 t = ar->expire - (ar->expire - now) / 10; // Wake up when 90% of the way to the expiry time
- if (e - t > 0) e = t;
- LogSPS("ComputeWakeTime: %p Int %7d Next %7d Expire %7d Wake %7d %s",
- ar, ar->ThisAPInterval / mDNSPlatformOneSecond,
- (ar->LastAPTime + ar->ThisAPInterval - now) / mDNSPlatformOneSecond,
- ar->expire ? (ar->expire - now) / mDNSPlatformOneSecond : 0,
- (t - now) / mDNSPlatformOneSecond, ARDisplayString(m, ar));
- }
-
- return(e - now);
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - Packet Reception Functions
-#endif
-
-#define MustSendRecord(RR) ((RR)->NR_AnswerTo || (RR)->NR_AdditionalTo)
-
-mDNSlocal mDNSu8 *GenerateUnicastResponse(const DNSMessage *const query, const mDNSu8 *const end,
- const mDNSInterfaceID InterfaceID, mDNSBool LegacyQuery, DNSMessage *const response, AuthRecord *ResponseRecords)
- {
- mDNSu8 *responseptr = response->data;
- const mDNSu8 *const limit = response->data + sizeof(response->data);
- const mDNSu8 *ptr = query->data;
- AuthRecord *rr;
- mDNSu32 maxttl = 0x70000000;
- int i;
-
- // Initialize the response fields so we can answer the questions
- InitializeDNSMessage(&response->h, query->h.id, ResponseFlags);
-
- // ***
- // *** 1. Write out the list of questions we are actually going to answer with this packet
- // ***
- if (LegacyQuery)
- {
- maxttl = kStaticCacheTTL;
- for (i=0; i<query->h.numQuestions; i++) // For each question...
- {
- DNSQuestion q;
- ptr = getQuestion(query, ptr, end, InterfaceID, &q); // get the question...
- if (!ptr) return(mDNSNULL);
-
- for (rr=ResponseRecords; rr; rr=rr->NextResponse) // and search our list of proposed answers
- {
- if (rr->NR_AnswerTo == ptr) // If we're going to generate a record answering this question
- { // then put the question in the question section
- responseptr = putQuestion(response, responseptr, limit, &q.qname, q.qtype, q.qclass);
- if (!responseptr) { debugf("GenerateUnicastResponse: Ran out of space for questions!"); return(mDNSNULL); }
- break; // break out of the ResponseRecords loop, and go on to the next question
- }
- }
- }
-
- if (response->h.numQuestions == 0) { LogMsg("GenerateUnicastResponse: ERROR! Why no questions?"); return(mDNSNULL); }
- }
-
- // ***
- // *** 2. Write Answers
- // ***
- for (rr=ResponseRecords; rr; rr=rr->NextResponse)
- if (rr->NR_AnswerTo)
- {
- mDNSu8 *p = PutResourceRecordTTL(response, responseptr, &response->h.numAnswers, &rr->resrec,
- maxttl < rr->resrec.rroriginalttl ? maxttl : rr->resrec.rroriginalttl);
- if (p) responseptr = p;
- else { debugf("GenerateUnicastResponse: Ran out of space for answers!"); response->h.flags.b[0] |= kDNSFlag0_TC; }
- }
-
- // ***
- // *** 3. Write Additionals
- // ***
- for (rr=ResponseRecords; rr; rr=rr->NextResponse)
- if (rr->NR_AdditionalTo && !rr->NR_AnswerTo)
- {
- mDNSu8 *p = PutResourceRecordTTL(response, responseptr, &response->h.numAdditionals, &rr->resrec,
- maxttl < rr->resrec.rroriginalttl ? maxttl : rr->resrec.rroriginalttl);
- if (p) responseptr = p;
- else debugf("GenerateUnicastResponse: No more space for additionals");
- }
-
- return(responseptr);
- }
-
-// AuthRecord *our is our Resource Record
-// CacheRecord *pkt is the Resource Record from the response packet we've witnessed on the network
-// Returns 0 if there is no conflict
-// Returns +1 if there was a conflict and we won
-// Returns -1 if there was a conflict and we lost and have to rename
-mDNSlocal int CompareRData(const AuthRecord *const our, const CacheRecord *const pkt)
- {
- mDNSu8 ourdata[256], *ourptr = ourdata, *ourend;
- mDNSu8 pktdata[256], *pktptr = pktdata, *pktend;
- if (!our) { LogMsg("CompareRData ERROR: our is NULL"); return(+1); }
- if (!pkt) { LogMsg("CompareRData ERROR: pkt is NULL"); return(+1); }
-
- ourend = putRData(mDNSNULL, ourdata, ourdata + sizeof(ourdata), &our->resrec);
- pktend = putRData(mDNSNULL, pktdata, pktdata + sizeof(pktdata), &pkt->resrec);
- while (ourptr < ourend && pktptr < pktend && *ourptr == *pktptr) { ourptr++; pktptr++; }
- if (ourptr >= ourend && pktptr >= pktend) return(0); // If data identical, not a conflict
-
- if (ourptr >= ourend) return(-1); // Our data ran out first; We lost
- if (pktptr >= pktend) return(+1); // Packet data ran out first; We won
- if (*pktptr > *ourptr) return(-1); // Our data is numerically lower; We lost
- if (*pktptr < *ourptr) return(+1); // Packet data is numerically lower; We won
-
- LogMsg("CompareRData ERROR: Invalid state");
- return(-1);
- }
-
-// See if we have an authoritative record that's identical to this packet record,
-// whose canonical DependentOn record is the specified master record.
-// The DependentOn pointer is typically used for the TXT record of service registrations
-// It indicates that there is no inherent conflict detection for the TXT record
-// -- it depends on the SRV record to resolve name conflicts
-// If we find any identical ResourceRecords in our authoritative list, then follow their DependentOn
-// pointer chain (if any) to make sure we reach the canonical DependentOn record
-// If the record has no DependentOn, then just return that record's pointer
-// Returns NULL if we don't have any local RRs that are identical to the one from the packet
-mDNSlocal mDNSBool MatchDependentOn(const mDNS *const m, const CacheRecord *const pktrr, const AuthRecord *const master)
- {
- const AuthRecord *r1;
- for (r1 = m->ResourceRecords; r1; r1=r1->next)
- {
- if (IdenticalResourceRecord(&r1->resrec, &pktrr->resrec))
- {
- const AuthRecord *r2 = r1;
- while (r2->DependentOn) r2 = r2->DependentOn;
- if (r2 == master) return(mDNStrue);
- }
- }
- for (r1 = m->DuplicateRecords; r1; r1=r1->next)
- {
- if (IdenticalResourceRecord(&r1->resrec, &pktrr->resrec))
- {
- const AuthRecord *r2 = r1;
- while (r2->DependentOn) r2 = r2->DependentOn;
- if (r2 == master) return(mDNStrue);
- }
- }
- return(mDNSfalse);
- }
-
-// Find the canonical RRSet pointer for this RR received in a packet.
-// If we find any identical AuthRecord in our authoritative list, then follow its RRSet
-// pointers (if any) to make sure we return the canonical member of this name/type/class
-// Returns NULL if we don't have any local RRs that are identical to the one from the packet
-mDNSlocal const AuthRecord *FindRRSet(const mDNS *const m, const CacheRecord *const pktrr)
- {
- const AuthRecord *rr;
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- {
- if (IdenticalResourceRecord(&rr->resrec, &pktrr->resrec))
- {
- while (rr->RRSet && rr != rr->RRSet) rr = rr->RRSet;
- return(rr);
- }
- }
- return(mDNSNULL);
- }
-
-// PacketRRConflict is called when we've received an RR (pktrr) which has the same name
-// as one of our records (our) but different rdata.
-// 1. If our record is not a type that's supposed to be unique, we don't care.
-// 2a. If our record is marked as dependent on some other record for conflict detection, ignore this one.
-// 2b. If the packet rr exactly matches one of our other RRs, and *that* record's DependentOn pointer
-// points to our record, ignore this conflict (e.g. the packet record matches one of our
-// TXT records, and that record is marked as dependent on 'our', its SRV record).
-// 3. If we have some *other* RR that exactly matches the one from the packet, and that record and our record
-// are members of the same RRSet, then this is not a conflict.
-mDNSlocal mDNSBool PacketRRConflict(const mDNS *const m, const AuthRecord *const our, const CacheRecord *const pktrr)
- {
- // If not supposed to be unique, not a conflict
- if (!(our->resrec.RecordType & kDNSRecordTypeUniqueMask)) return(mDNSfalse);
-
- // If a dependent record, not a conflict
- if (our->DependentOn || MatchDependentOn(m, pktrr, our)) return(mDNSfalse);
- else
- {
- // If the pktrr matches a member of ourset, not a conflict
- const AuthRecord *ourset = our->RRSet ? our->RRSet : our;
- const AuthRecord *pktset = FindRRSet(m, pktrr);
- if (pktset == ourset) return(mDNSfalse);
-
- // For records we're proxying, where we don't know the full
- // relationship between the records, having any matching record
- // in our AuthRecords list is sufficient evidence of non-conflict
- if (our->WakeUp.HMAC.l[0] && pktset) return(mDNSfalse);
- }
-
- // Okay, this is a conflict
- return(mDNStrue);
- }
-
-// Note: ResolveSimultaneousProbe calls mDNS_Deregister_internal which can call a user callback, which may change
-// the record list and/or question list.
-// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this.
-mDNSlocal void ResolveSimultaneousProbe(mDNS *const m, const DNSMessage *const query, const mDNSu8 *const end,
- DNSQuestion *q, AuthRecord *our)
- {
- int i;
- const mDNSu8 *ptr = LocateAuthorities(query, end);
- mDNSBool FoundUpdate = mDNSfalse;
-
- for (i = 0; i < query->h.numAuthorities; i++)
- {
- ptr = GetLargeResourceRecord(m, query, ptr, end, q->InterfaceID, kDNSRecordTypePacketAuth, &m->rec);
- if (!ptr) break;
- if (m->rec.r.resrec.RecordType != kDNSRecordTypePacketNegative && ResourceRecordAnswersQuestion(&m->rec.r.resrec, q))
- {
- FoundUpdate = mDNStrue;
- if (PacketRRConflict(m, our, &m->rec.r))
- {
- int result = (int)our->resrec.rrclass - (int)m->rec.r.resrec.rrclass;
- if (!result) result = (int)our->resrec.rrtype - (int)m->rec.r.resrec.rrtype;
- if (!result) result = CompareRData(our, &m->rec.r);
- if (result)
- {
- const char *const msg = (result < 0) ? "lost:" : (result > 0) ? "won: " : "tie: ";
- LogMsg("ResolveSimultaneousProbe: %p Pkt Record: %08lX %s", q->InterfaceID, m->rec.r.resrec.rdatahash, CRDisplayString(m, &m->rec.r));
- LogMsg("ResolveSimultaneousProbe: %p Our Record %d %s %08lX %s", our->resrec.InterfaceID, our->ProbeCount, msg, our->resrec.rdatahash, ARDisplayString(m, our));
- }
- // If we lost the tie-break for simultaneous probes, we don't immediately give up, because we might be seeing stale packets on the network.
- // Instead we pause for one second, to give the other host (if real) a chance to establish its name, and then try probing again.
- // If there really is another live host out there with the same name, it will answer our probes and we'll then rename.
- if (result < 0)
- {
- m->SuppressProbes = NonZeroTime(m->timenow + mDNSPlatformOneSecond);
- our->ProbeCount = DefaultProbeCountForTypeUnique;
- our->AnnounceCount = InitialAnnounceCount;
- InitializeLastAPTime(m, our);
- goto exit;
- }
- }
-#if 0
- else
- {
- LogMsg("ResolveSimultaneousProbe: %p Pkt Record: %08lX %s", q->InterfaceID, m->rec.r.resrec.rdatahash, CRDisplayString(m, &m->rec.r));
- LogMsg("ResolveSimultaneousProbe: %p Our Record %d ign: %08lX %s", our->resrec.InterfaceID, our->ProbeCount, our->resrec.rdatahash, ARDisplayString(m, our));
- }
-#endif
- }
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
- }
- if (!FoundUpdate)
- LogInfo("ResolveSimultaneousProbe: %##s (%s): No Update Record found", our->resrec.name->c, DNSTypeName(our->resrec.rrtype));
-exit:
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
- }
-
-mDNSlocal CacheRecord *FindIdenticalRecordInCache(const mDNS *const m, const ResourceRecord *const pktrr)
- {
- mDNSu32 slot = HashSlot(pktrr->name);
- CacheGroup *cg = CacheGroupForRecord(m, slot, pktrr);
- CacheRecord *rr;
- mDNSBool match;
- for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next)
- {
- match = !pktrr->InterfaceID ? pktrr->rDNSServer == rr->resrec.rDNSServer : pktrr->InterfaceID == rr->resrec.InterfaceID;
- if (match && IdenticalSameNameRecord(pktrr, &rr->resrec)) break;
- }
- return(rr);
- }
-
-// Called from mDNSCoreReceiveUpdate when we get a sleep proxy registration request,
-// to check our lists and discard any stale duplicates of this record we already have
-mDNSlocal void ClearIdenticalProxyRecords(mDNS *const m, const OwnerOptData *const owner, AuthRecord *const thelist)
- {
- if (m->CurrentRecord)
- LogMsg("ClearIdenticalProxyRecords ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord));
- m->CurrentRecord = thelist;
- while (m->CurrentRecord)
- {
- AuthRecord *const rr = m->CurrentRecord;
- if (m->rec.r.resrec.InterfaceID == rr->resrec.InterfaceID && mDNSSameEthAddress(&owner->HMAC, &rr->WakeUp.HMAC))
- if (IdenticalResourceRecord(&rr->resrec, &m->rec.r.resrec))
- {
- LogSPS("ClearIdenticalProxyRecords: Removing %3d H-MAC %.6a I-MAC %.6a %d %d %s",
- m->ProxyRecords, &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, rr->WakeUp.seq, owner->seq, ARDisplayString(m, rr));
- rr->WakeUp.HMAC = zeroEthAddr; // Clear HMAC so that mDNS_Deregister_internal doesn't waste packets trying to wake this host
- rr->RequireGoodbye = mDNSfalse; // and we don't want to send goodbye for it
- mDNS_Deregister_internal(m, rr, mDNS_Dereg_normal);
- SetSPSProxyListChanged(m->rec.r.resrec.InterfaceID);
- }
- // Mustn't advance m->CurrentRecord until *after* mDNS_Deregister_internal, because
- // new records could have been added to the end of the list as a result of that call.
- if (m->CurrentRecord == rr) // If m->CurrentRecord was not advanced for us, do it now
- m->CurrentRecord = rr->next;
- }
- }
-
-// Called from ProcessQuery when we get an mDNS packet with an owner record in it
-mDNSlocal void ClearProxyRecords(mDNS *const m, const OwnerOptData *const owner, AuthRecord *const thelist)
- {
- if (m->CurrentRecord)
- LogMsg("ClearProxyRecords ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord));
- m->CurrentRecord = thelist;
- while (m->CurrentRecord)
- {
- AuthRecord *const rr = m->CurrentRecord;
- if (m->rec.r.resrec.InterfaceID == rr->resrec.InterfaceID && mDNSSameEthAddress(&owner->HMAC, &rr->WakeUp.HMAC))
- if (owner->seq != rr->WakeUp.seq || m->timenow - rr->TimeRcvd > mDNSPlatformOneSecond * 60)
- {
- if (rr->AddressProxy.type == mDNSAddrType_IPv6)
- {
- // We don't do this here because we know that the host is waking up at this point, so we don't send
- // Unsolicited Neighbor Advertisements -- even Neighbor Advertisements agreeing with what the host should be
- // saying itself -- because it can cause some IPv6 stacks to falsely conclude that there's an address conflict.
- #if MDNS_USE_Unsolicited_Neighbor_Advertisements
- LogSPS("NDP Announcement -- Releasing traffic for H-MAC %.6a I-MAC %.6a %s",
- &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, ARDisplayString(m,rr));
- SendNDP(m, NDP_Adv, NDP_Override, rr, &rr->AddressProxy.ip.v6, &rr->WakeUp.IMAC, &AllHosts_v6, &AllHosts_v6_Eth);
- #endif
- }
- LogSPS("ClearProxyRecords: Removing %3d AC %2d %02X H-MAC %.6a I-MAC %.6a %d %d %s",
- m->ProxyRecords, rr->AnnounceCount, rr->resrec.RecordType,
- &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, rr->WakeUp.seq, owner->seq, ARDisplayString(m, rr));
- if (rr->resrec.RecordType == kDNSRecordTypeDeregistering) rr->resrec.RecordType = kDNSRecordTypeShared;
- rr->WakeUp.HMAC = zeroEthAddr; // Clear HMAC so that mDNS_Deregister_internal doesn't waste packets trying to wake this host
- rr->RequireGoodbye = mDNSfalse; // and we don't want to send goodbye for it, since real host is now back and functional
- mDNS_Deregister_internal(m, rr, mDNS_Dereg_normal);
- SetSPSProxyListChanged(m->rec.r.resrec.InterfaceID);
- }
- // Mustn't advance m->CurrentRecord until *after* mDNS_Deregister_internal, because
- // new records could have been added to the end of the list as a result of that call.
- if (m->CurrentRecord == rr) // If m->CurrentRecord was not advanced for us, do it now
- m->CurrentRecord = rr->next;
- }
- }
-
-// ProcessQuery examines a received query to see if we have any answers to give
-mDNSlocal mDNSu8 *ProcessQuery(mDNS *const m, const DNSMessage *const query, const mDNSu8 *const end,
- const mDNSAddr *srcaddr, const mDNSInterfaceID InterfaceID, mDNSBool LegacyQuery, mDNSBool QueryWasMulticast,
- mDNSBool QueryWasLocalUnicast, DNSMessage *const response)
- {
- mDNSBool FromLocalSubnet = srcaddr && mDNS_AddressIsLocalSubnet(m, InterfaceID, srcaddr);
- AuthRecord *ResponseRecords = mDNSNULL;
- AuthRecord **nrp = &ResponseRecords;
- CacheRecord *ExpectedAnswers = mDNSNULL; // Records in our cache we expect to see updated
- CacheRecord **eap = &ExpectedAnswers;
- DNSQuestion *DupQuestions = mDNSNULL; // Our questions that are identical to questions in this packet
- DNSQuestion **dqp = &DupQuestions;
- mDNSs32 delayresponse = 0;
- mDNSBool SendLegacyResponse = mDNSfalse;
- const mDNSu8 *ptr;
- mDNSu8 *responseptr = mDNSNULL;
- AuthRecord *rr;
- int i;
-
- // ***
- // *** 1. Look in Additional Section for an OPT record
- // ***
- ptr = LocateOptRR(query, end, DNSOpt_OwnerData_ID_Space);
- if (ptr)
- {
- ptr = GetLargeResourceRecord(m, query, ptr, end, InterfaceID, kDNSRecordTypePacketAdd, &m->rec);
- if (ptr && m->rec.r.resrec.RecordType != kDNSRecordTypePacketNegative && m->rec.r.resrec.rrtype == kDNSType_OPT)
- {
- const rdataOPT *opt;
- const rdataOPT *const e = (const rdataOPT *)&m->rec.r.resrec.rdata->u.data[m->rec.r.resrec.rdlength];
- // Find owner sub-option(s). We verify that the MAC is non-zero, otherwise we could inadvertently
- // delete all our own AuthRecords (which are identified by having zero MAC tags on them).
- for (opt = &m->rec.r.resrec.rdata->u.opt[0]; opt < e; opt++)
- if (opt->opt == kDNSOpt_Owner && opt->u.owner.vers == 0 && opt->u.owner.HMAC.l[0])
- {
- ClearProxyRecords(m, &opt->u.owner, m->DuplicateRecords);
- ClearProxyRecords(m, &opt->u.owner, m->ResourceRecords);
- }
- }
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
- }
-
- // ***
- // *** 2. Parse Question Section and mark potential answers
- // ***
- ptr = query->data;
- for (i=0; i<query->h.numQuestions; i++) // For each question...
- {
- mDNSBool QuestionNeedsMulticastResponse;
- int NumAnswersForThisQuestion = 0;
- AuthRecord *NSECAnswer = mDNSNULL;
- DNSQuestion pktq, *q;
- ptr = getQuestion(query, ptr, end, InterfaceID, &pktq); // get the question...
- if (!ptr) goto exit;
-
- // The only queries that *need* a multicast response are:
- // * Queries sent via multicast
- // * from port 5353
- // * that don't have the kDNSQClass_UnicastResponse bit set
- // These queries need multicast responses because other clients will:
- // * suppress their own identical questions when they see these questions, and
- // * expire their cache records if they don't see the expected responses
- // For other queries, we may still choose to send the occasional multicast response anyway,
- // to keep our neighbours caches warm, and for ongoing conflict detection.
- QuestionNeedsMulticastResponse = QueryWasMulticast && !LegacyQuery && !(pktq.qclass & kDNSQClass_UnicastResponse);
- // Clear the UnicastResponse flag -- don't want to confuse the rest of the code that follows later
- pktq.qclass &= ~kDNSQClass_UnicastResponse;
-
- // Note: We use the m->CurrentRecord mechanism here because calling ResolveSimultaneousProbe
- // can result in user callbacks which may change the record list and/or question list.
- // Also note: we just mark potential answer records here, without trying to build the
- // "ResponseRecords" list, because we don't want to risk user callbacks deleting records
- // from that list while we're in the middle of trying to build it.
- if (m->CurrentRecord)
- LogMsg("ProcessQuery ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord));
- m->CurrentRecord = m->ResourceRecords;
- while (m->CurrentRecord)
- {
- rr = m->CurrentRecord;
- m->CurrentRecord = rr->next;
- if (AnyTypeRecordAnswersQuestion(&rr->resrec, &pktq) && (QueryWasMulticast || QueryWasLocalUnicast || rr->AllowRemoteQuery))
- {
- if (RRTypeAnswersQuestionType(&rr->resrec, pktq.qtype))
- {
- if (rr->resrec.RecordType == kDNSRecordTypeUnique)
- ResolveSimultaneousProbe(m, query, end, &pktq, rr);
- else if (ResourceRecordIsValidAnswer(rr))
- {
- NumAnswersForThisQuestion++;
- // Note: We should check here if this is a probe-type query, and if so, generate an immediate
- // unicast answer back to the source, because timeliness in answering probes is important.
-
- // Notes:
- // NR_AnswerTo pointing into query packet means "answer via immediate legacy unicast" (may *also* choose to multicast)
- // NR_AnswerTo == (mDNSu8*)~1 means "answer via delayed unicast" (to modern querier; may promote to multicast instead)
- // NR_AnswerTo == (mDNSu8*)~0 means "definitely answer via multicast" (can't downgrade to unicast later)
- // If we're not multicasting this record because the kDNSQClass_UnicastResponse bit was set,
- // but the multicast querier is not on a matching subnet (e.g. because of overlaid subnets on one link)
- // then we'll multicast it anyway (if we unicast, the receiver will ignore it because it has an apparently non-local source)
- if (QuestionNeedsMulticastResponse || (!FromLocalSubnet && QueryWasMulticast && !LegacyQuery))
- {
- // We only mark this question for sending if it is at least one second since the last time we multicast it
- // on this interface. If it is more than a second, or LastMCInterface is different, then we may multicast it.
- // This is to guard against the case where someone blasts us with queries as fast as they can.
- if (m->timenow - (rr->LastMCTime + mDNSPlatformOneSecond) >= 0 ||
- (rr->LastMCInterface != mDNSInterfaceMark && rr->LastMCInterface != InterfaceID))
- rr->NR_AnswerTo = (mDNSu8*)~0;
- }
- else if (!rr->NR_AnswerTo) rr->NR_AnswerTo = LegacyQuery ? ptr : (mDNSu8*)~1;
- }
- }
- else if ((rr->resrec.RecordType & kDNSRecordTypeActiveUniqueMask) && ResourceRecordIsValidAnswer(rr))
- {
- // If we don't have any answers for this question, but we do own another record with the same name,
- // then we'll want to mark it to generate an NSEC record on this interface
- if (!NSECAnswer) NSECAnswer = rr;
- }
- }
- }
-
- if (NumAnswersForThisQuestion == 0 && NSECAnswer)
- {
- NumAnswersForThisQuestion++;
- NSECAnswer->SendNSECNow = InterfaceID;
- m->NextScheduledResponse = m->timenow;
- }
-
- // If we couldn't answer this question, someone else might be able to,
- // so use random delay on response to reduce collisions
- if (NumAnswersForThisQuestion == 0) delayresponse = mDNSPlatformOneSecond; // Divided by 50 = 20ms
-
-#if ENABLE_MULTI_PACKET_QUERY_SNOOPING
- if (QuestionNeedsMulticastResponse)
-#else
- // We only do the following accelerated cache expiration and duplicate question suppression processing
- // for non-truncated multicast queries with multicast responses.
- // For any query generating a unicast response we don't do this because we can't assume we will see the response.
- // For truncated queries we don't do this because a response we're expecting might be suppressed by a subsequent
- // known-answer packet, and when there's packet loss we can't safely assume we'll receive *all* known-answer packets.
- if (QuestionNeedsMulticastResponse && !(query->h.flags.b[0] & kDNSFlag0_TC))
-#endif
- {
- const mDNSu32 slot = HashSlot(&pktq.qname);
- CacheGroup *cg = CacheGroupForName(m, slot, pktq.qnamehash, &pktq.qname);
- CacheRecord *cr;
-
- // Make a list indicating which of our own cache records we expect to see updated as a result of this query
- // Note: Records larger than 1K are not habitually multicast, so don't expect those to be updated
-#if ENABLE_MULTI_PACKET_QUERY_SNOOPING
- if (!(query->h.flags.b[0] & kDNSFlag0_TC))
-#endif
- for (cr = cg ? cg->members : mDNSNULL; cr; cr=cr->next)
- if (SameNameRecordAnswersQuestion(&cr->resrec, &pktq) && cr->resrec.rdlength <= SmallRecordLimit)
- if (!cr->NextInKAList && eap != &cr->NextInKAList)
- {
- *eap = cr;
- eap = &cr->NextInKAList;
-#if ENABLE_MULTI_PACKET_QUERY_SNOOPING
- if (cr->MPUnansweredQ == 0 || m->timenow - cr->MPLastUnansweredQT >= mDNSPlatformOneSecond)
- {
- // Although MPUnansweredQ is only really used for multi-packet query processing,
- // we increment it for both single-packet and multi-packet queries, so that it stays in sync
- // with the MPUnansweredKA value, which by necessity is incremented for both query types.
- cr->MPUnansweredQ++;
- cr->MPLastUnansweredQT = m->timenow;
- cr->MPExpectingKA = mDNStrue;
- }
-#endif
- }
-
- // Check if this question is the same as any of mine.
- // We only do this for non-truncated queries. Right now it would be too complicated to try
- // to keep track of duplicate suppression state between multiple packets, especially when we
- // can't guarantee to receive all of the Known Answer packets that go with a particular query.
-#if ENABLE_MULTI_PACKET_QUERY_SNOOPING
- if (!(query->h.flags.b[0] & kDNSFlag0_TC))
-#endif
- for (q = m->Questions; q; q=q->next)
- if (!q->Target.type && ActiveQuestion(q) && m->timenow - q->LastQTxTime > mDNSPlatformOneSecond / 4)
- if (!q->InterfaceID || q->InterfaceID == InterfaceID)
- if (q->NextInDQList == mDNSNULL && dqp != &q->NextInDQList)
- if (q->qtype == pktq.qtype &&
- q->qclass == pktq.qclass &&
- q->qnamehash == pktq.qnamehash && SameDomainName(&q->qname, &pktq.qname))
- { *dqp = q; dqp = &q->NextInDQList; }
- }
- }
-
- // ***
- // *** 3. Now we can safely build the list of marked answers
- // ***
- for (rr = m->ResourceRecords; rr; rr=rr->next) // Now build our list of potential answers
- if (rr->NR_AnswerTo) // If we marked the record...
- AddRecordToResponseList(&nrp, rr, mDNSNULL); // ... add it to the list
-
- // ***
- // *** 4. Add additional records
- // ***
- AddAdditionalsToResponseList(m, ResponseRecords, &nrp, InterfaceID);
-
- // ***
- // *** 5. Parse Answer Section and cancel any records disallowed by Known-Answer list
- // ***
- for (i=0; i<query->h.numAnswers; i++) // For each record in the query's answer section...
- {
- // Get the record...
- CacheRecord *ourcacherr;
- ptr = GetLargeResourceRecord(m, query, ptr, end, InterfaceID, kDNSRecordTypePacketAns, &m->rec);
- if (!ptr) goto exit;
- if (m->rec.r.resrec.RecordType != kDNSRecordTypePacketNegative)
- {
- // See if this Known-Answer suppresses any of our currently planned answers
- for (rr=ResponseRecords; rr; rr=rr->NextResponse)
- if (MustSendRecord(rr) && ShouldSuppressKnownAnswer(&m->rec.r, rr))
- { rr->NR_AnswerTo = mDNSNULL; rr->NR_AdditionalTo = mDNSNULL; }
-
- // See if this Known-Answer suppresses any previously scheduled answers (for multi-packet KA suppression)
- for (rr=m->ResourceRecords; rr; rr=rr->next)
- {
- // If we're planning to send this answer on this interface, and only on this interface, then allow KA suppression
- if (rr->ImmedAnswer == InterfaceID && ShouldSuppressKnownAnswer(&m->rec.r, rr))
- {
- if (srcaddr->type == mDNSAddrType_IPv4)
- {
- if (mDNSSameIPv4Address(rr->v4Requester, srcaddr->ip.v4)) rr->v4Requester = zerov4Addr;
- }
- else if (srcaddr->type == mDNSAddrType_IPv6)
- {
- if (mDNSSameIPv6Address(rr->v6Requester, srcaddr->ip.v6)) rr->v6Requester = zerov6Addr;
- }
- if (mDNSIPv4AddressIsZero(rr->v4Requester) && mDNSIPv6AddressIsZero(rr->v6Requester))
- {
- rr->ImmedAnswer = mDNSNULL;
- rr->ImmedUnicast = mDNSfalse;
- #if MDNS_LOG_ANSWER_SUPPRESSION_TIMES
- LogMsg("Suppressed after%4d: %s", m->timenow - rr->ImmedAnswerMarkTime, ARDisplayString(m, rr));
- #endif
- }
- }
- }
-
- ourcacherr = FindIdenticalRecordInCache(m, &m->rec.r.resrec);
-
- #if ENABLE_MULTI_PACKET_QUERY_SNOOPING
- // See if this Known-Answer suppresses any answers we were expecting for our cache records. We do this always,
- // even if the TC bit is not set (the TC bit will *not* be set in the *last* packet of a multi-packet KA list).
- if (ourcacherr && ourcacherr->MPExpectingKA && m->timenow - ourcacherr->MPLastUnansweredQT < mDNSPlatformOneSecond)
- {
- ourcacherr->MPUnansweredKA++;
- ourcacherr->MPExpectingKA = mDNSfalse;
- }
- #endif
-
- // Having built our ExpectedAnswers list from the questions in this packet, we then remove
- // any records that are suppressed by the Known Answer list in this packet.
- eap = &ExpectedAnswers;
- while (*eap)
- {
- CacheRecord *cr = *eap;
- if (cr->resrec.InterfaceID == InterfaceID && IdenticalResourceRecord(&m->rec.r.resrec, &cr->resrec))
- { *eap = cr->NextInKAList; cr->NextInKAList = mDNSNULL; }
- else eap = &cr->NextInKAList;
- }
-
- // See if this Known-Answer is a surprise to us. If so, we shouldn't suppress our own query.
- if (!ourcacherr)
- {
- dqp = &DupQuestions;
- while (*dqp)
- {
- DNSQuestion *q = *dqp;
- if (ResourceRecordAnswersQuestion(&m->rec.r.resrec, q))
- { *dqp = q->NextInDQList; q->NextInDQList = mDNSNULL; }
- else dqp = &q->NextInDQList;
- }
- }
- }
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
- }
-
- // ***
- // *** 6. Cancel any additionals that were added because of now-deleted records
- // ***
- for (rr=ResponseRecords; rr; rr=rr->NextResponse)
- if (rr->NR_AdditionalTo && !MustSendRecord(rr->NR_AdditionalTo))
- { rr->NR_AnswerTo = mDNSNULL; rr->NR_AdditionalTo = mDNSNULL; }
-
- // ***
- // *** 7. Mark the send flags on the records we plan to send
- // ***
- for (rr=ResponseRecords; rr; rr=rr->NextResponse)
- {
- if (rr->NR_AnswerTo)
- {
- mDNSBool SendMulticastResponse = mDNSfalse; // Send modern multicast response
- mDNSBool SendUnicastResponse = mDNSfalse; // Send modern unicast response (not legacy unicast response)
-
- // If it's been a while since we multicast this, then send a multicast response for conflict detection, etc.
- if (m->timenow - (rr->LastMCTime + TicksTTL(rr)/4) >= 0)
- {
- SendMulticastResponse = mDNStrue;
- // If this record was marked for modern (delayed) unicast response, then mark it as promoted to
- // multicast response instead (don't want to end up ALSO setting SendUnicastResponse in the check below).
- // If this record was marked for legacy unicast response, then we mustn't change the NR_AnswerTo value.
- if (rr->NR_AnswerTo == (mDNSu8*)~1) rr->NR_AnswerTo = (mDNSu8*)~0;
- }
-
- // If the client insists on a multicast response, then we'd better send one
- if (rr->NR_AnswerTo == (mDNSu8*)~0) SendMulticastResponse = mDNStrue;
- else if (rr->NR_AnswerTo == (mDNSu8*)~1) SendUnicastResponse = mDNStrue;
- else if (rr->NR_AnswerTo) SendLegacyResponse = mDNStrue;
-
- if (SendMulticastResponse || SendUnicastResponse)
- {
-#if MDNS_LOG_ANSWER_SUPPRESSION_TIMES
- rr->ImmedAnswerMarkTime = m->timenow;
-#endif
- m->NextScheduledResponse = m->timenow;
- // If we're already planning to send this on another interface, just send it on all interfaces
- if (rr->ImmedAnswer && rr->ImmedAnswer != InterfaceID)
- rr->ImmedAnswer = mDNSInterfaceMark;
- else
- {
- rr->ImmedAnswer = InterfaceID; // Record interface to send it on
- if (SendUnicastResponse) rr->ImmedUnicast = mDNStrue;
- if (srcaddr->type == mDNSAddrType_IPv4)
- {
- if (mDNSIPv4AddressIsZero(rr->v4Requester)) rr->v4Requester = srcaddr->ip.v4;
- else if (!mDNSSameIPv4Address(rr->v4Requester, srcaddr->ip.v4)) rr->v4Requester = onesIPv4Addr;
- }
- else if (srcaddr->type == mDNSAddrType_IPv6)
- {
- if (mDNSIPv6AddressIsZero(rr->v6Requester)) rr->v6Requester = srcaddr->ip.v6;
- else if (!mDNSSameIPv6Address(rr->v6Requester, srcaddr->ip.v6)) rr->v6Requester = onesIPv6Addr;
- }
- }
- }
- // If TC flag is set, it means we should expect that additional known answers may be coming in another packet,
- // so we allow roughly half a second before deciding to reply (we've observed inter-packet delays of 100-200ms on 802.11)
- // else, if record is a shared one, spread responses over 100ms to avoid implosion of simultaneous responses
- // else, for a simple unique record reply, we can reply immediately; no need for delay
- if (query->h.flags.b[0] & kDNSFlag0_TC) delayresponse = mDNSPlatformOneSecond * 20; // Divided by 50 = 400ms
- else if (rr->resrec.RecordType == kDNSRecordTypeShared) delayresponse = mDNSPlatformOneSecond; // Divided by 50 = 20ms
- }
- else if (rr->NR_AdditionalTo && rr->NR_AdditionalTo->NR_AnswerTo == (mDNSu8*)~0)
- {
- // Since additional records are an optimization anyway, we only ever send them on one interface at a time
- // If two clients on different interfaces do queries that invoke the same optional additional answer,
- // then the earlier client is out of luck
- rr->ImmedAdditional = InterfaceID;
- // No need to set m->NextScheduledResponse here
- // We'll send these additional records when we send them, or not, as the case may be
- }
- }
-
- // ***
- // *** 8. If we think other machines are likely to answer these questions, set our packet suppression timer
- // ***
- if (delayresponse && (!m->SuppressSending || (m->SuppressSending - m->timenow) < (delayresponse + 49) / 50))
- {
-#if MDNS_LOG_ANSWER_SUPPRESSION_TIMES
- mDNSs32 oldss = m->SuppressSending;
- if (oldss && delayresponse)
- LogMsg("Current SuppressSending delay%5ld; require%5ld", m->SuppressSending - m->timenow, (delayresponse + 49) / 50);
-#endif
- // Pick a random delay:
- // We start with the base delay chosen above (typically either 1 second or 20 seconds),
- // and add a random value in the range 0-5 seconds (making 1-6 seconds or 20-25 seconds).
- // This is an integer value, with resolution determined by the platform clock rate.
- // We then divide that by 50 to get the delay value in ticks. We defer the division until last
- // to get better results on platforms with coarse clock granularity (e.g. ten ticks per second).
- // The +49 before dividing is to ensure we round up, not down, to ensure that even
- // on platforms where the native clock rate is less than fifty ticks per second,
- // we still guarantee that the final calculated delay is at least one platform tick.
- // We want to make sure we don't ever allow the delay to be zero ticks,
- // because if that happens we'll fail the Bonjour Conformance Test.
- // Our final computed delay is 20-120ms for normal delayed replies,
- // or 400-500ms in the case of multi-packet known-answer lists.
- m->SuppressSending = m->timenow + (delayresponse + (mDNSs32)mDNSRandom((mDNSu32)mDNSPlatformOneSecond*5) + 49) / 50;
- if (m->SuppressSending == 0) m->SuppressSending = 1;
-#if MDNS_LOG_ANSWER_SUPPRESSION_TIMES
- if (oldss && delayresponse)
- LogMsg("Set SuppressSending to %5ld", m->SuppressSending - m->timenow);
-#endif
- }
-
- // ***
- // *** 9. If query is from a legacy client, or from a new client requesting a unicast reply, then generate a unicast response too
- // ***
- if (SendLegacyResponse)
- responseptr = GenerateUnicastResponse(query, end, InterfaceID, LegacyQuery, response, ResponseRecords);
-
-exit:
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
-
- // ***
- // *** 10. Finally, clear our link chains ready for use next time
- // ***
- while (ResponseRecords)
- {
- rr = ResponseRecords;
- ResponseRecords = rr->NextResponse;
- rr->NextResponse = mDNSNULL;
- rr->NR_AnswerTo = mDNSNULL;
- rr->NR_AdditionalTo = mDNSNULL;
- }
-
- while (ExpectedAnswers)
- {
- CacheRecord *cr = ExpectedAnswers;
- ExpectedAnswers = cr->NextInKAList;
- cr->NextInKAList = mDNSNULL;
-
- // For non-truncated queries, we can definitively say that we should expect
- // to be seeing a response for any records still left in the ExpectedAnswers list
- if (!(query->h.flags.b[0] & kDNSFlag0_TC))
- if (cr->UnansweredQueries == 0 || m->timenow - cr->LastUnansweredTime >= mDNSPlatformOneSecond)
- {
- cr->UnansweredQueries++;
- cr->LastUnansweredTime = m->timenow;
-#if ENABLE_MULTI_PACKET_QUERY_SNOOPING
- if (cr->UnansweredQueries > 1)
- debugf("ProcessQuery: (!TC) UAQ %lu MPQ %lu MPKA %lu %s",
- cr->UnansweredQueries, cr->MPUnansweredQ, cr->MPUnansweredKA, CRDisplayString(m, cr));
-#endif
- SetNextCacheCheckTimeForRecord(m, cr);
- }
-
- // If we've seen multiple unanswered queries for this record,
- // then mark it to expire in five seconds if we don't get a response by then.
- if (cr->UnansweredQueries >= MaxUnansweredQueries)
- {
-#if ENABLE_MULTI_PACKET_QUERY_SNOOPING
- // Only show debugging message if this record was not about to expire anyway
- if (RRExpireTime(cr) - m->timenow > 4 * mDNSPlatformOneSecond)
- debugf("ProcessQuery: (Max) UAQ %lu MPQ %lu MPKA %lu mDNS_Reconfirm() for %s",
- cr->UnansweredQueries, cr->MPUnansweredQ, cr->MPUnansweredKA, CRDisplayString(m, cr));
-#endif
- mDNS_Reconfirm_internal(m, cr, kDefaultReconfirmTimeForNoAnswer);
- }
-#if ENABLE_MULTI_PACKET_QUERY_SNOOPING
- // Make a guess, based on the multi-packet query / known answer counts, whether we think we
- // should have seen an answer for this. (We multiply MPQ by 4 and MPKA by 5, to allow for
- // possible packet loss of up to 20% of the additional KA packets.)
- else if (cr->MPUnansweredQ * 4 > cr->MPUnansweredKA * 5 + 8)
- {
- // We want to do this conservatively.
- // If there are so many machines on the network that they have to use multi-packet known-answer lists,
- // then we don't want them to all hit the network simultaneously with their final expiration queries.
- // By setting the record to expire in four minutes, we achieve two things:
- // (a) the 90-95% final expiration queries will be less bunched together
- // (b) we allow some time for us to witness enough other failed queries that we don't have to do our own
- mDNSu32 remain = (mDNSu32)(RRExpireTime(cr) - m->timenow) / 4;
- if (remain > 240 * (mDNSu32)mDNSPlatformOneSecond)
- remain = 240 * (mDNSu32)mDNSPlatformOneSecond;
-
- // Only show debugging message if this record was not about to expire anyway
- if (RRExpireTime(cr) - m->timenow > 4 * mDNSPlatformOneSecond)
- debugf("ProcessQuery: (MPQ) UAQ %lu MPQ %lu MPKA %lu mDNS_Reconfirm() for %s",
- cr->UnansweredQueries, cr->MPUnansweredQ, cr->MPUnansweredKA, CRDisplayString(m, cr));
-
- if (remain <= 60 * (mDNSu32)mDNSPlatformOneSecond)
- cr->UnansweredQueries++; // Treat this as equivalent to one definite unanswered query
- cr->MPUnansweredQ = 0; // Clear MPQ/MPKA statistics
- cr->MPUnansweredKA = 0;
- cr->MPExpectingKA = mDNSfalse;
-
- if (remain < kDefaultReconfirmTimeForNoAnswer)
- remain = kDefaultReconfirmTimeForNoAnswer;
- mDNS_Reconfirm_internal(m, cr, remain);
- }
-#endif
- }
-
- while (DupQuestions)
- {
- DNSQuestion *q = DupQuestions;
- DupQuestions = q->NextInDQList;
- q->NextInDQList = mDNSNULL;
- i = RecordDupSuppressInfo(q->DupSuppress, m->timenow, InterfaceID, srcaddr->type);
- debugf("ProcessQuery: Recorded DSI for %##s (%s) on %p/%s %d", q->qname.c, DNSTypeName(q->qtype), InterfaceID,
- srcaddr->type == mDNSAddrType_IPv4 ? "v4" : "v6", i);
- }
-
- return(responseptr);
- }
-
-mDNSlocal void mDNSCoreReceiveQuery(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *const end,
- const mDNSAddr *srcaddr, const mDNSIPPort srcport, const mDNSAddr *dstaddr, mDNSIPPort dstport,
- const mDNSInterfaceID InterfaceID)
- {
- mDNSu8 *responseend = mDNSNULL;
- mDNSBool QueryWasLocalUnicast = srcaddr && dstaddr &&
- !mDNSAddrIsDNSMulticast(dstaddr) && mDNS_AddressIsLocalSubnet(m, InterfaceID, srcaddr);
-
- if (!InterfaceID && dstaddr && mDNSAddrIsDNSMulticast(dstaddr))
- {
- LogMsg("Ignoring Query from %#-15a:%-5d to %#-15a:%-5d on 0x%p with "
- "%2d Question%s %2d Answer%s %2d Authorit%s %2d Additional%s %d bytes (Multicast, but no InterfaceID)",
- srcaddr, mDNSVal16(srcport), dstaddr, mDNSVal16(dstport), InterfaceID,
- msg->h.numQuestions, msg->h.numQuestions == 1 ? ", " : "s,",
- msg->h.numAnswers, msg->h.numAnswers == 1 ? ", " : "s,",
- msg->h.numAuthorities, msg->h.numAuthorities == 1 ? "y, " : "ies,",
- msg->h.numAdditionals, msg->h.numAdditionals == 1 ? " " : "s", end - msg->data);
- return;
- }
-
- verbosedebugf("Received Query from %#-15a:%-5d to %#-15a:%-5d on 0x%p with "
- "%2d Question%s %2d Answer%s %2d Authorit%s %2d Additional%s %d bytes",
- srcaddr, mDNSVal16(srcport), dstaddr, mDNSVal16(dstport), InterfaceID,
- msg->h.numQuestions, msg->h.numQuestions == 1 ? ", " : "s,",
- msg->h.numAnswers, msg->h.numAnswers == 1 ? ", " : "s,",
- msg->h.numAuthorities, msg->h.numAuthorities == 1 ? "y, " : "ies,",
- msg->h.numAdditionals, msg->h.numAdditionals == 1 ? " " : "s", end - msg->data);
-
- responseend = ProcessQuery(m, msg, end, srcaddr, InterfaceID,
- !mDNSSameIPPort(srcport, MulticastDNSPort), mDNSAddrIsDNSMulticast(dstaddr), QueryWasLocalUnicast, &m->omsg);
-
- if (responseend) // If responseend is non-null, that means we built a unicast response packet
- {
- debugf("Unicast Response: %d Question%s, %d Answer%s, %d Additional%s to %#-15a:%d on %p/%ld",
- m->omsg.h.numQuestions, m->omsg.h.numQuestions == 1 ? "" : "s",
- m->omsg.h.numAnswers, m->omsg.h.numAnswers == 1 ? "" : "s",
- m->omsg.h.numAdditionals, m->omsg.h.numAdditionals == 1 ? "" : "s",
- srcaddr, mDNSVal16(srcport), InterfaceID, srcaddr->type);
- mDNSSendDNSMessage(m, &m->omsg, responseend, InterfaceID, mDNSNULL, srcaddr, srcport, mDNSNULL, mDNSNULL);
- }
- }
-
-#if 0
-mDNSlocal mDNSBool TrustedSource(const mDNS *const m, const mDNSAddr *const srcaddr)
- {
- DNSServer *s;
- (void)m; // Unused
- (void)srcaddr; // Unused
- for (s = m->DNSServers; s; s = s->next)
- if (mDNSSameAddress(srcaddr, &s->addr)) return(mDNStrue);
- return(mDNSfalse);
- }
-#endif
-
-struct UDPSocket_struct
- {
- mDNSIPPort port; // MUST BE FIRST FIELD -- mDNSCoreReceive expects every UDPSocket_struct to begin with mDNSIPPort port
- };
-
-mDNSlocal DNSQuestion *ExpectingUnicastResponseForQuestion(const mDNS *const m, const mDNSIPPort port, const mDNSOpaque16 id, const DNSQuestion *const question, mDNSBool tcp)
- {
- DNSQuestion *q;
- for (q = m->Questions; q; q=q->next)
- {
- if (!tcp && !q->LocalSocket) continue;
- if (mDNSSameIPPort(tcp ? q->tcpSrcPort : q->LocalSocket->port, port) &&
- mDNSSameOpaque16(q->TargetQID, id) &&
- q->qtype == question->qtype &&
- q->qclass == question->qclass &&
- q->qnamehash == question->qnamehash &&
- SameDomainName(&q->qname, &question->qname))
- return(q);
- }
- return(mDNSNULL);
- }
-
-// This function is called when we receive a unicast response. This could be the case of a unicast response from the
-// DNS server or a response to the QU query. Hence, the cache record's InterfaceId can be both NULL or non-NULL (QU case)
-mDNSlocal DNSQuestion *ExpectingUnicastResponseForRecord(mDNS *const m,
- const mDNSAddr *const srcaddr, const mDNSBool SrcLocal, const mDNSIPPort port, const mDNSOpaque16 id, const CacheRecord *const rr, mDNSBool tcp)
- {
- DNSQuestion *q;
- (void)id;
- (void)srcaddr;
-
- for (q = m->Questions; q; q=q->next)
- {
- if (!q->DuplicateOf && ResourceRecordAnswersUnicastResponse(&rr->resrec, q))
- {
- if (!mDNSOpaque16IsZero(q->TargetQID))
- {
- debugf("ExpectingUnicastResponseForRecord msg->h.id %d q->TargetQID %d for %s", mDNSVal16(id), mDNSVal16(q->TargetQID), CRDisplayString(m, rr));
-
- if (mDNSSameOpaque16(q->TargetQID, id))
- {
- mDNSIPPort srcp;
- if (!tcp)
- {
- srcp = q->LocalSocket ? q->LocalSocket->port : zeroIPPort;
- }
- else
- {
- srcp = q->tcpSrcPort;
- }
- if (mDNSSameIPPort(srcp, port)) return(q);
-
- // if (mDNSSameAddress(srcaddr, &q->Target)) return(mDNStrue);
- // if (q->LongLived && mDNSSameAddress(srcaddr, &q->servAddr)) return(mDNStrue); Shouldn't need this now that we have LLQType checking
- // if (TrustedSource(m, srcaddr)) return(mDNStrue);
- LogInfo("WARNING: Ignoring suspect uDNS response for %##s (%s) [q->Target %#a:%d] from %#a:%d %s",
- q->qname.c, DNSTypeName(q->qtype), &q->Target, mDNSVal16(srcp), srcaddr, mDNSVal16(port), CRDisplayString(m, rr));
- return(mDNSNULL);
- }
- }
- else
- {
- if (SrcLocal && q->ExpectUnicastResp && (mDNSu32)(m->timenow - q->ExpectUnicastResp) < (mDNSu32)(mDNSPlatformOneSecond*2))
- return(q);
- }
- }
- }
- return(mDNSNULL);
- }
-
-// Certain data types need more space for in-memory storage than their in-packet rdlength would imply
-// Currently this applies only to rdata types containing more than one domainname,
-// or types where the domainname is not the last item in the structure.
-// In addition, NSEC currently requires less space for in-memory storage than its in-packet representation.
-mDNSlocal mDNSu16 GetRDLengthMem(const ResourceRecord *const rr)
- {
- switch (rr->rrtype)
- {
- case kDNSType_SOA: return sizeof(rdataSOA);
- case kDNSType_RP: return sizeof(rdataRP);
- case kDNSType_PX: return sizeof(rdataPX);
- case kDNSType_NSEC:return sizeof(rdataNSEC);
- default: return rr->rdlength;
- }
- }
-
-mDNSexport CacheRecord *CreateNewCacheEntry(mDNS *const m, const mDNSu32 slot, CacheGroup *cg, mDNSs32 delay)
- {
- CacheRecord *rr = mDNSNULL;
- mDNSu16 RDLength = GetRDLengthMem(&m->rec.r.resrec);
-
- if (!m->rec.r.resrec.InterfaceID) debugf("CreateNewCacheEntry %s", CRDisplayString(m, &m->rec.r));
-
- //if (RDLength > InlineCacheRDSize)
- // LogInfo("Rdata len %4d > InlineCacheRDSize %d %s", RDLength, InlineCacheRDSize, CRDisplayString(m, &m->rec.r));
-
- if (!cg) cg = GetCacheGroup(m, slot, &m->rec.r.resrec); // If we don't have a CacheGroup for this name, make one now
- if (cg) rr = GetCacheRecord(m, cg, RDLength); // Make a cache record, being careful not to recycle cg
- if (!rr) NoCacheAnswer(m, &m->rec.r);
- else
- {
- RData *saveptr = rr->resrec.rdata; // Save the rr->resrec.rdata pointer
- *rr = m->rec.r; // Block copy the CacheRecord object
- rr->resrec.rdata = saveptr; // Restore rr->resrec.rdata after the structure assignment
- rr->resrec.name = cg->name; // And set rr->resrec.name to point into our CacheGroup header
- rr->DelayDelivery = delay;
-
- // If this is an oversized record with external storage allocated, copy rdata to external storage
- if (rr->resrec.rdata == (RData*)&rr->smallrdatastorage && RDLength > InlineCacheRDSize)
- LogMsg("rr->resrec.rdata == &rr->rdatastorage but length > InlineCacheRDSize %##s", m->rec.r.resrec.name->c);
- else if (rr->resrec.rdata != (RData*)&rr->smallrdatastorage && RDLength <= InlineCacheRDSize)
- LogMsg("rr->resrec.rdata != &rr->rdatastorage but length <= InlineCacheRDSize %##s", m->rec.r.resrec.name->c);
- if (RDLength > InlineCacheRDSize)
- mDNSPlatformMemCopy(rr->resrec.rdata, m->rec.r.resrec.rdata, sizeofRDataHeader + RDLength);
-
- rr->next = mDNSNULL; // Clear 'next' pointer
- *(cg->rrcache_tail) = rr; // Append this record to tail of cache slot list
- cg->rrcache_tail = &(rr->next); // Advance tail pointer
-
- CacheRecordAdd(m, rr); // CacheRecordAdd calls SetNextCacheCheckTimeForRecord(m, rr); for us
- }
- return(rr);
- }
-
-mDNSlocal void RefreshCacheRecord(mDNS *const m, CacheRecord *rr, mDNSu32 ttl)
- {
- rr->TimeRcvd = m->timenow;
- rr->resrec.rroriginalttl = ttl;
- rr->UnansweredQueries = 0;
-#if ENABLE_MULTI_PACKET_QUERY_SNOOPING
- rr->MPUnansweredQ = 0;
- rr->MPUnansweredKA = 0;
- rr->MPExpectingKA = mDNSfalse;
-#endif
- SetNextCacheCheckTimeForRecord(m, rr);
- }
-
-mDNSexport void GrantCacheExtensions(mDNS *const m, DNSQuestion *q, mDNSu32 lease)
- {
- CacheRecord *rr;
- const mDNSu32 slot = HashSlot(&q->qname);
- CacheGroup *cg = CacheGroupForName(m, slot, q->qnamehash, &q->qname);
- for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next)
- if (rr->CRActiveQuestion == q)
- {
- //LogInfo("GrantCacheExtensions: new lease %d / %s", lease, CRDisplayString(m, rr));
- RefreshCacheRecord(m, rr, lease);
- }
- }
-
-mDNSlocal mDNSu32 GetEffectiveTTL(const uDNS_LLQType LLQType, mDNSu32 ttl) // TTL in seconds
- {
- if (LLQType == uDNS_LLQ_Entire) ttl = kLLQ_DefLease;
- else if (LLQType == uDNS_LLQ_Events)
- {
- // If the TTL is -1 for uDNS LLQ event packet, that means "remove"
- if (ttl == 0xFFFFFFFF) ttl = 0;
- else ttl = kLLQ_DefLease;
- }
- else // else not LLQ (standard uDNS response)
- {
- // The TTL is already capped to a maximum value in GetLargeResourceRecord, but just to be extra safe we
- // also do this check here to make sure we can't get overflow below when we add a quarter to the TTL
- if (ttl > 0x60000000UL / mDNSPlatformOneSecond) ttl = 0x60000000UL / mDNSPlatformOneSecond;
-
- // Adjustment factor to avoid race condition:
- // Suppose real record as TTL of 3600, and our local caching server has held it for 3500 seconds, so it returns an aged TTL of 100.
- // If we do our normal refresh at 80% of the TTL, our local caching server will return 20 seconds, so we'll do another
- // 80% refresh after 16 seconds, and then the server will return 4 seconds, and so on, in the fashion of Zeno's paradox.
- // To avoid this, we extend the record's effective TTL to give it a little extra grace period.
- // We adjust the 100 second TTL to 126. This means that when we do our 80% query at 101 seconds,
- // the cached copy at our local caching server will already have expired, so the server will be forced
- // to fetch a fresh copy from the authoritative server, and then return a fresh record with the full TTL of 3600 seconds.
- ttl += ttl/4 + 2;
-
- // For mDNS, TTL zero means "delete this record"
- // For uDNS, TTL zero means: this data is true at this moment, but don't cache it.
- // For the sake of network efficiency, we impose a minimum effective TTL of 15 seconds.
- // This means that we'll do our 80, 85, 90, 95% queries at 12.00, 12.75, 13.50, 14.25 seconds
- // respectively, and then if we get no response, delete the record from the cache at 15 seconds.
- // This gives the server up to three seconds to respond between when we send our 80% query at 12 seconds
- // and when we delete the record at 15 seconds. Allowing cache lifetimes less than 15 seconds would
- // (with the current code) result in the server having even less than three seconds to respond
- // before we deleted the record and reported a "remove" event to any active questions.
- // Furthermore, with the current code, if we were to allow a TTL of less than 2 seconds
- // then things really break (e.g. we end up making a negative cache entry).
- // In the future we may want to revisit this and consider properly supporting non-cached (TTL=0) uDNS answers.
- if (ttl < 15) ttl = 15;
- }
-
- return ttl;
- }
-
-// Note: mDNSCoreReceiveResponse calls mDNS_Deregister_internal which can call a user callback, which may change
-// the record list and/or question list.
-// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this.
-// InterfaceID non-NULL tells us the interface this multicast response was received on
-// InterfaceID NULL tells us this was a unicast response
-// dstaddr NULL tells us we received this over an outgoing TCP connection we made
-mDNSlocal void mDNSCoreReceiveResponse(mDNS *const m,
- const DNSMessage *const response, const mDNSu8 *end,
- const mDNSAddr *srcaddr, const mDNSIPPort srcport, const mDNSAddr *dstaddr, mDNSIPPort dstport,
- const mDNSInterfaceID InterfaceID)
- {
- int i;
- mDNSBool ResponseMCast = dstaddr && mDNSAddrIsDNSMulticast(dstaddr);
- mDNSBool ResponseSrcLocal = !srcaddr || mDNS_AddressIsLocalSubnet(m, InterfaceID, srcaddr);
- DNSQuestion *llqMatch = mDNSNULL;
- uDNS_LLQType LLQType = uDNS_recvLLQResponse(m, response, end, srcaddr, srcport, &llqMatch);
-
- // "(CacheRecord*)1" is a special (non-zero) end-of-list marker
- // We use this non-zero marker so that records in our CacheFlushRecords list will always have NextInCFList
- // set non-zero, and that tells GetCacheEntity() that they're not, at this moment, eligible for recycling.
- CacheRecord *CacheFlushRecords = (CacheRecord*)1;
- CacheRecord **cfp = &CacheFlushRecords;
-
- // All records in a DNS response packet are treated as equally valid statements of truth. If we want
- // to guard against spoof responses, then the only credible protection against that is cryptographic
- // security, e.g. DNSSEC., not worring about which section in the spoof packet contained the record
- int firstauthority = response->h.numAnswers;
- int firstadditional = firstauthority + response->h.numAuthorities;
- int totalrecords = firstadditional + response->h.numAdditionals;
- const mDNSu8 *ptr = response->data;
- DNSServer *uDNSServer = mDNSNULL;
-
- debugf("Received Response from %#-15a addressed to %#-15a on %p with "
- "%2d Question%s %2d Answer%s %2d Authorit%s %2d Additional%s %d bytes LLQType %d",
- srcaddr, dstaddr, InterfaceID,
- response->h.numQuestions, response->h.numQuestions == 1 ? ", " : "s,",
- response->h.numAnswers, response->h.numAnswers == 1 ? ", " : "s,",
- response->h.numAuthorities, response->h.numAuthorities == 1 ? "y, " : "ies,",
- response->h.numAdditionals, response->h.numAdditionals == 1 ? " " : "s", end - response->data, LLQType);
-
- // According to RFC 2181 <http://www.ietf.org/rfc/rfc2181.txt>
- // When a DNS client receives a reply with TC
- // set, it should ignore that response, and query again, using a
- // mechanism, such as a TCP connection, that will permit larger replies.
- // It feels wrong to be throwing away data after the network went to all the trouble of delivering it to us, but
- // delivering some records of the RRSet first and then the remainder a couple of milliseconds later was causing
- // failures in our Microsoft Active Directory client, which expects to get the entire set of answers at once.
- // <rdar://problem/6690034> Can't bind to Active Directory
- // In addition, if the client immediately canceled its query after getting the initial partial response, then we'll
- // abort our TCP connection, and not complete the operation, and end up with an incomplete RRSet in our cache.
- // Next time there's a query for this RRSet we'll see answers in our cache, and assume we have the whole RRSet already,
- // and not even do the TCP query.
- // Accordingly, if we get a uDNS reply with kDNSFlag0_TC set, we bail out and wait for the TCP response containing the entire RRSet.
- if (!InterfaceID && (response->h.flags.b[0] & kDNSFlag0_TC)) return;
-
- if (LLQType == uDNS_LLQ_Ignore) return;
-
- // 1. We ignore questions (if any) in mDNS response packets
- // 2. If this is an LLQ response, we handle it much the same
- // 3. If we get a uDNS UDP response with the TC (truncated) bit set, then we can't treat this
- // answer as being the authoritative complete RRSet, and respond by deleting all other
- // matching cache records that don't appear in this packet.
- // Otherwise, this is a authoritative uDNS answer, so arrange for any stale records to be purged
- if (ResponseMCast || LLQType == uDNS_LLQ_Events || (response->h.flags.b[0] & kDNSFlag0_TC))
- ptr = LocateAnswers(response, end);
- // Otherwise, for one-shot queries, any answers in our cache that are not also contained
- // in this response packet are immediately deemed to be invalid.
- else
- {
- mDNSu8 rcode = (mDNSu8)(response->h.flags.b[1] & kDNSFlag1_RC_Mask);
- mDNSBool failure = !(rcode == kDNSFlag1_RC_NoErr || rcode == kDNSFlag1_RC_NXDomain || rcode == kDNSFlag1_RC_NotAuth);
- mDNSBool returnEarly = mDNSfalse;
- // We could possibly combine this with the similar loop at the end of this function --
- // instead of tagging cache records here and then rescuing them if we find them in the answer section,
- // we could instead use the "m->PktNum" mechanism to tag each cache record with the packet number in
- // which it was received (or refreshed), and then at the end if we find any cache records which
- // answer questions in this packet's question section, but which aren't tagged with this packet's
- // packet number, then we deduce they are old and delete them
- for (i = 0; i < response->h.numQuestions && ptr && ptr < end; i++)
- {
- DNSQuestion q, *qptr = mDNSNULL;
- ptr = getQuestion(response, ptr, end, InterfaceID, &q);
- if (ptr && (qptr = ExpectingUnicastResponseForQuestion(m, dstport, response->h.id, &q, !dstaddr)))
- {
- if (!failure)
- {
- CacheRecord *rr;
- const mDNSu32 slot = HashSlot(&q.qname);
- CacheGroup *cg = CacheGroupForName(m, slot, q.qnamehash, &q.qname);
- for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next)
- if (SameNameRecordAnswersQuestion(&rr->resrec, qptr))
- {
- debugf("uDNS marking %p %##s (%s) %p %s", q.InterfaceID, q.qname.c, DNSTypeName(q.qtype),
- rr->resrec.InterfaceID, CRDisplayString(m, rr));
- // Don't want to disturb rroriginalttl here, because code below might need it for the exponential backoff doubling algorithm
- rr->TimeRcvd = m->timenow - TicksTTL(rr) - 1;
- rr->UnansweredQueries = MaxUnansweredQueries;
- }
- }
- else
- {
- if (qptr)
- {
- LogInfo("mDNSCoreReceiveResponse: Server %p responded with code %d to query %##s (%s)", qptr->qDNSServer, rcode, q.qname.c, DNSTypeName(q.qtype));
- PenalizeDNSServer(m, qptr);
- }
- returnEarly = mDNStrue;
- }
- }
- }
- if (returnEarly)
- {
- LogInfo("Ignoring %2d Answer%s %2d Authorit%s %2d Additional%s",
- response->h.numAnswers, response->h.numAnswers == 1 ? ", " : "s,",
- response->h.numAuthorities, response->h.numAuthorities == 1 ? "y, " : "ies,",
- response->h.numAdditionals, response->h.numAdditionals == 1 ? "" : "s");
- // not goto exit because we won't have any CacheFlushRecords and we do not want to
- // generate negative cache entries (we want to query the next server)
- return;
- }
- }
-
- for (i = 0; i < totalrecords && ptr && ptr < end; i++)
- {
- // All responses sent via LL multicast are acceptable for caching
- // All responses received over our outbound TCP connections are acceptable for caching
- mDNSBool AcceptableResponse = ResponseMCast || !dstaddr || LLQType;
- // (Note that just because we are willing to cache something, that doesn't necessarily make it a trustworthy answer
- // to any specific question -- any code reading records from the cache needs to make that determination for itself.)
-
- const mDNSu8 RecordType =
- (i < firstauthority ) ? (mDNSu8)kDNSRecordTypePacketAns :
- (i < firstadditional) ? (mDNSu8)kDNSRecordTypePacketAuth : (mDNSu8)kDNSRecordTypePacketAdd;
- ptr = GetLargeResourceRecord(m, response, ptr, end, InterfaceID, RecordType, &m->rec);
- if (!ptr) goto exit; // Break out of the loop and clean up our CacheFlushRecords list before exiting
- if (m->rec.r.resrec.RecordType == kDNSRecordTypePacketNegative) { m->rec.r.resrec.RecordType = 0; continue; }
-
- // Don't want to cache OPT or TSIG pseudo-RRs
- if (m->rec.r.resrec.rrtype == kDNSType_TSIG) { m->rec.r.resrec.RecordType = 0; continue; }
- if (m->rec.r.resrec.rrtype == kDNSType_OPT)
- {
- const rdataOPT *opt;
- const rdataOPT *const e = (const rdataOPT *)&m->rec.r.resrec.rdata->u.data[m->rec.r.resrec.rdlength];
- // Find owner sub-option(s). We verify that the MAC is non-zero, otherwise we could inadvertently
- // delete all our own AuthRecords (which are identified by having zero MAC tags on them).
- for (opt = &m->rec.r.resrec.rdata->u.opt[0]; opt < e; opt++)
- if (opt->opt == kDNSOpt_Owner && opt->u.owner.vers == 0 && opt->u.owner.HMAC.l[0])
- {
- ClearProxyRecords(m, &opt->u.owner, m->DuplicateRecords);
- ClearProxyRecords(m, &opt->u.owner, m->ResourceRecords);
- }
- m->rec.r.resrec.RecordType = 0;
- continue;
- }
-
- // if a CNAME record points to itself, then don't add it to the cache
- if ((m->rec.r.resrec.rrtype == kDNSType_CNAME) && SameDomainName(m->rec.r.resrec.name, &m->rec.r.resrec.rdata->u.name))
- {
- LogInfo("mDNSCoreReceiveResponse: CNAME loop domain name %##s", m->rec.r.resrec.name->c);
- m->rec.r.resrec.RecordType = 0;
- continue;
- }
-
- // When we receive uDNS LLQ responses, we assume a long cache lifetime --
- // In the case of active LLQs, we'll get remove events when the records actually do go away
- // In the case of polling LLQs, we assume the record remains valid until the next poll
- if (!mDNSOpaque16IsZero(response->h.id))
- m->rec.r.resrec.rroriginalttl = GetEffectiveTTL(LLQType, m->rec.r.resrec.rroriginalttl);
-
- // If response was not sent via LL multicast,
- // then see if it answers a recent query of ours, which would also make it acceptable for caching.
- if (!ResponseMCast)
- {
- if (LLQType)
- {
- // For Long Lived queries that are both sent over UDP and Private TCP, LLQType is set.
- // Even though it is AcceptableResponse, we need a matching DNSServer pointer for the
- // queries to get ADD/RMV events. To lookup the question, we can't use
- // ExpectingUnicastResponseForRecord as the port numbers don't match. uDNS_recvLLQRespose
- // has already matched the question using the 64 bit Id in the packet and we use that here.
-
- if (llqMatch != mDNSNULL) m->rec.r.resrec.rDNSServer = uDNSServer = llqMatch->qDNSServer;
- }
- else if (!AcceptableResponse || !dstaddr)
- {
- // For responses that come over TCP (Responses that can't fit within UDP) or TLS (Private queries
- // that are not long lived e.g., AAAA lookup in a Private domain), it is indicated by !dstaddr.
- // Even though it is AcceptableResponse, we still need a DNSServer pointer for the resource records that
- // we create.
-
- DNSQuestion *q = ExpectingUnicastResponseForRecord(m, srcaddr, ResponseSrcLocal, dstport, response->h.id, &m->rec.r, !dstaddr);
-
- // Intialize the DNS server on the resource record which will now filter what questions we answer with
- // this record.
- //
- // We could potentially lookup the DNS server based on the source address, but that may not work always
- // and that's why ExpectingUnicastResponseForRecord does not try to verify whether the response came
- // from the DNS server that queried. We follow the same logic here. If we can find a matching quetion based
- // on the "id" and "source port", then this response answers the question and assume the response
- // came from the same DNS server that we sent the query to.
-
- if (q != mDNSNULL)
- {
- AcceptableResponse = mDNStrue;
- if (!InterfaceID)
- {
- debugf("mDNSCoreReceiveResponse: InterfaceID %p %##s (%s)", q->InterfaceID, q->qname.c, DNSTypeName(q->qtype));
- m->rec.r.resrec.rDNSServer = uDNSServer = q->qDNSServer;
- }
- }
- else
- {
- // If we can't find a matching question, we need to see whether we have seen records earlier that matched
- // the question. The code below does that. So, make this record unacceptable for now
- if (!InterfaceID)
- {
- debugf("mDNSCoreReceiveResponse: Can't find question for record name %##s", m->rec.r.resrec.name->c);
- AcceptableResponse = mDNSfalse;
- }
- }
- }
- }
-
- // 1. Check that this packet resource record does not conflict with any of ours
- if (mDNSOpaque16IsZero(response->h.id) && m->rec.r.resrec.rrtype != kDNSType_NSEC)
- {
- if (m->CurrentRecord)
- LogMsg("mDNSCoreReceiveResponse ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord));
- m->CurrentRecord = m->ResourceRecords;
- while (m->CurrentRecord)
- {
- AuthRecord *rr = m->CurrentRecord;
- m->CurrentRecord = rr->next;
- // We accept all multicast responses, and unicast responses resulting from queries we issued
- // For other unicast responses, this code accepts them only for responses with an
- // (apparently) local source address that pertain to a record of our own that's in probing state
- if (!AcceptableResponse && !(ResponseSrcLocal && rr->resrec.RecordType == kDNSRecordTypeUnique)) continue;
-
- if (PacketRRMatchesSignature(&m->rec.r, rr)) // If interface, name, type (if shared record) and class match...
- {
- // ... check to see if type and rdata are identical
- if (IdenticalSameNameRecord(&m->rec.r.resrec, &rr->resrec))
- {
- // If the RR in the packet is identical to ours, just check they're not trying to lower the TTL on us
- if (m->rec.r.resrec.rroriginalttl >= rr->resrec.rroriginalttl/2 || m->SleepState)
- {
- // If we were planning to send on this -- and only this -- interface, then we don't need to any more
- if (rr->ImmedAnswer == InterfaceID) { rr->ImmedAnswer = mDNSNULL; rr->ImmedUnicast = mDNSfalse; }
- }
- else
- {
- if (rr->ImmedAnswer == mDNSNULL) { rr->ImmedAnswer = InterfaceID; m->NextScheduledResponse = m->timenow; }
- else if (rr->ImmedAnswer != InterfaceID) { rr->ImmedAnswer = mDNSInterfaceMark; m->NextScheduledResponse = m->timenow; }
- }
- }
- // else, the packet RR has different type or different rdata -- check to see if this is a conflict
- else if (m->rec.r.resrec.rroriginalttl > 0 && PacketRRConflict(m, rr, &m->rec.r))
- {
- LogInfo("mDNSCoreReceiveResponse: Pkt Record: %08lX %s", m->rec.r.resrec.rdatahash, CRDisplayString(m, &m->rec.r));
- LogInfo("mDNSCoreReceiveResponse: Our Record: %08lX %s", rr-> resrec.rdatahash, ARDisplayString(m, rr));
-
- // If this record is marked DependentOn another record for conflict detection purposes,
- // then *that* record has to be bumped back to probing state to resolve the conflict
- if (rr->DependentOn)
- {
- while (rr->DependentOn) rr = rr->DependentOn;
- LogInfo("mDNSCoreReceiveResponse: Dep Record: %08lX %s", rr-> resrec.rdatahash, ARDisplayString(m, rr));
- }
-
- // If we've just whacked this record's ProbeCount, don't need to do it again
- if (rr->ProbeCount > DefaultProbeCountForTypeUnique)
- LogInfo("mDNSCoreReceiveResponse: Already reset to Probing: %s", ARDisplayString(m, rr));
- else if (rr->ProbeCount == DefaultProbeCountForTypeUnique)
- LogMsg("mDNSCoreReceiveResponse: Ignoring response received before we even began probing: %s", ARDisplayString(m, rr));
- else
- {
- LogMsg("mDNSCoreReceiveResponse: Received from %#a:%d %s", srcaddr, mDNSVal16(srcport), CRDisplayString(m, &m->rec.r));
- // If we'd previously verified this record, put it back to probing state and try again
- if (rr->resrec.RecordType == kDNSRecordTypeVerified)
- {
- LogMsg("mDNSCoreReceiveResponse: Resetting to Probing: %s", ARDisplayString(m, rr));
- rr->resrec.RecordType = kDNSRecordTypeUnique;
- // We set ProbeCount to one more than the usual value so we know we've already touched this record.
- // This is because our single probe for "example-name.local" could yield a response with (say) two A records and
- // three AAAA records in it, and we don't want to call RecordProbeFailure() five times and count that as five conflicts.
- // This special value is recognised and reset to DefaultProbeCountForTypeUnique in SendQueries().
- rr->ProbeCount = DefaultProbeCountForTypeUnique + 1;
- rr->AnnounceCount = InitialAnnounceCount;
- InitializeLastAPTime(m, rr);
- RecordProbeFailure(m, rr); // Repeated late conflicts also cause us to back off to the slower probing rate
- }
- // If we're probing for this record, we just failed
- else if (rr->resrec.RecordType == kDNSRecordTypeUnique)
- {
- LogMsg("mDNSCoreReceiveResponse: ProbeCount %d; will deregister %s", rr->ProbeCount, ARDisplayString(m, rr));
- mDNS_Deregister_internal(m, rr, mDNS_Dereg_conflict);
- }
- // We assumed this record must be unique, but we were wrong. (e.g. There are two mDNSResponders on the
- // same machine giving different answers for the reverse mapping record, or there are two machines on the
- // network using the same IP address.) This is simply a misconfiguration, and there's nothing we can do
- // to fix it -- e.g. it's not our job to be trying to change the machine's IP address. We just discard our
- // record to avoid continued conflicts (as we do for a conflict on our Unique records) and get on with life.
- else if (rr->resrec.RecordType == kDNSRecordTypeKnownUnique)
- {
- LogMsg("mDNSCoreReceiveResponse: Unexpected conflict discarding %s", ARDisplayString(m, rr));
- mDNS_Deregister_internal(m, rr, mDNS_Dereg_conflict);
- }
- else
- LogMsg("mDNSCoreReceiveResponse: Unexpected record type %X %s", rr->resrec.RecordType, ARDisplayString(m, rr));
- }
- }
- // Else, matching signature, different type or rdata, but not a considered a conflict.
- // If the packet record has the cache-flush bit set, then we check to see if we
- // have any record(s) of the same type that we should re-assert to rescue them
- // (see note about "multi-homing and bridged networks" at the end of this function).
- else if (m->rec.r.resrec.rrtype == rr->resrec.rrtype)
- if ((m->rec.r.resrec.RecordType & kDNSRecordTypePacketUniqueMask) && m->timenow - rr->LastMCTime > mDNSPlatformOneSecond/2)
- { rr->ImmedAnswer = mDNSInterfaceMark; m->NextScheduledResponse = m->timenow; }
- }
- }
- }
-
- if (!AcceptableResponse)
- {
- const CacheRecord *cr;
- for (cr = CacheFlushRecords; cr != (CacheRecord*)1; cr = cr->NextInCFList)
- {
- domainname *target = GetRRDomainNameTarget(&cr->resrec);
- // When we issue a query for A record, the response might contain both a CNAME and A records. Only the CNAME would
- // match the question and we already created a cache entry in the previous pass of this loop. Now when we process
- // the A record, it does not match the question because the record name here is the CNAME. Hence we try to
- // match with the previous records to make it an AcceptableResponse. We have to be careful about setting the
- // DNSServer value that we got in the previous pass. This can happen for other record types like SRV also.
-
- if (target && cr->resrec.rdatahash == m->rec.r.resrec.namehash && SameDomainName(target, m->rec.r.resrec.name))
- {
- debugf("mDNSCoreReceiveResponse: Found a matching entry for %##s in the CacheFlushRecords", m->rec.r.resrec.name->c);
- AcceptableResponse = mDNStrue;
- m->rec.r.resrec.rDNSServer = uDNSServer;
- break;
- }
- }
- }
-
- // 2. See if we want to add this packet resource record to our cache
- // We only try to cache answers if we have a cache to put them in
- // Also, we ignore any apparent attempts at cache poisoning unicast to us that do not answer any outstanding active query
- if (!AcceptableResponse) LogInfo("mDNSCoreReceiveResponse ignoring %s", CRDisplayString(m, &m->rec.r));
- if (m->rrcache_size && AcceptableResponse)
- {
- const mDNSu32 slot = HashSlot(m->rec.r.resrec.name);
- CacheGroup *cg = CacheGroupForRecord(m, slot, &m->rec.r.resrec);
- CacheRecord *rr;
-
- // 2a. Check if this packet resource record is already in our cache
- for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next)
- {
- mDNSBool match = !InterfaceID ? m->rec.r.resrec.rDNSServer == rr->resrec.rDNSServer : rr->resrec.InterfaceID == InterfaceID;
- // If we found this exact resource record, refresh its TTL
- if (match && IdenticalSameNameRecord(&m->rec.r.resrec, &rr->resrec))
- {
- if (m->rec.r.resrec.rdlength > InlineCacheRDSize)
- verbosedebugf("Found record size %5d interface %p already in cache: %s",
- m->rec.r.resrec.rdlength, InterfaceID, CRDisplayString(m, &m->rec.r));
-
- if (m->rec.r.resrec.RecordType & kDNSRecordTypePacketUniqueMask)
- {
- // If this packet record has the kDNSClass_UniqueRRSet flag set, then add it to our cache flushing list
- if (rr->NextInCFList == mDNSNULL && cfp != &rr->NextInCFList && LLQType != uDNS_LLQ_Events)
- { *cfp = rr; cfp = &rr->NextInCFList; *cfp = (CacheRecord*)1; }
-
- // If this packet record is marked unique, and our previous cached copy was not, then fix it
- if (!(rr->resrec.RecordType & kDNSRecordTypePacketUniqueMask))
- {
- DNSQuestion *q;
- for (q = m->Questions; q; q=q->next) if (ResourceRecordAnswersQuestion(&rr->resrec, q)) q->UniqueAnswers++;
- rr->resrec.RecordType = m->rec.r.resrec.RecordType;
- }
- }
-
- if (!SameRDataBody(&m->rec.r.resrec, &rr->resrec.rdata->u, SameDomainNameCS))
- {
- // If the rdata of the packet record differs in name capitalization from the record in our cache
- // then mDNSPlatformMemSame will detect this. In this case, throw the old record away, so that clients get
- // a 'remove' event for the record with the old capitalization, and then an 'add' event for the new one.
- // <rdar://problem/4015377> mDNS -F returns the same domain multiple times with different casing
- rr->resrec.rroriginalttl = 0;
- rr->TimeRcvd = m->timenow;
- rr->UnansweredQueries = MaxUnansweredQueries;
- SetNextCacheCheckTimeForRecord(m, rr);
- LogInfo("Discarding due to domainname case change old: %s", CRDisplayString(m,rr));
- LogInfo("Discarding due to domainname case change new: %s", CRDisplayString(m,&m->rec.r));
- LogInfo("Discarding due to domainname case change in %d slot %3d in %d %d",
- NextCacheCheckEvent(rr) - m->timenow, slot, m->rrcache_nextcheck[slot] - m->timenow, m->NextCacheCheck - m->timenow);
- // DO NOT break out here -- we want to continue as if we never found it
- }
- else if (m->rec.r.resrec.rroriginalttl > 0)
- {
- DNSQuestion *q;
- //if (rr->resrec.rroriginalttl == 0) LogMsg("uDNS rescuing %s", CRDisplayString(m, rr));
- RefreshCacheRecord(m, rr, m->rec.r.resrec.rroriginalttl);
-
- // We have to reset the question interval to MaxQuestionInterval so that we don't keep
- // polling the network once we get a valid response back. For the first time when a new
- // cache entry is created, AnswerCurrentQuestionWithResourceRecord does that.
- // Subsequently, if we reissue questions from within the mDNSResponder e.g., DNS server
- // configuration changed, without flushing the cache, we reset the question interval here.
- // Currently, we do this for for both multicast and unicast questions as long as the record
- // type is unique. For unicast, resource record is always unique and for multicast it is
- // true for records like A etc. but not for PTR.
- if (rr->resrec.RecordType & kDNSRecordTypePacketUniqueMask)
- {
- for (q = m->Questions; q; q=q->next)
- {
- if (!q->DuplicateOf && !q->LongLived &&
- ActiveQuestion(q) && ResourceRecordAnswersQuestion(&rr->resrec, q))
- {
- ResetQuestionState(m, q);
- debugf("mDNSCoreReceiveResponse: Set MaxQuestionInterval for %p %##s (%s)", q, q->qname.c, DNSTypeName(q->qtype));
- break; // Why break here? Aren't there other questions we might want to look at?-- SC July 2010
- }
- }
- }
- break;
- }
- else
- {
- // If the packet TTL is zero, that means we're deleting this record.
- // To give other hosts on the network a chance to protest, we push the deletion
- // out one second into the future. Also, we set UnansweredQueries to MaxUnansweredQueries.
- // Otherwise, we'll do final queries for this record at 80% and 90% of its apparent
- // lifetime (800ms and 900ms from now) which is a pointless waste of network bandwidth.
- // If record's current expiry time is more than a second from now, we set it to expire in one second.
- // If the record is already going to expire in less than one second anyway, we leave it alone --
- // we don't want to let the goodbye packet *extend* the record's lifetime in our cache.
- debugf("DE for %s", CRDisplayString(m, rr));
- if (RRExpireTime(rr) - m->timenow > mDNSPlatformOneSecond)
- {
- rr->resrec.rroriginalttl = 1;
- rr->TimeRcvd = m->timenow;
- rr->UnansweredQueries = MaxUnansweredQueries;
- SetNextCacheCheckTimeForRecord(m, rr);
- }
- break;
- }
- }
- }
-
- // If packet resource record not in our cache, add it now
- // (unless it is just a deletion of a record we never had, in which case we don't care)
- if (!rr && m->rec.r.resrec.rroriginalttl > 0)
- {
- const mDNSBool AddToCFList = (m->rec.r.resrec.RecordType & kDNSRecordTypePacketUniqueMask) && (LLQType != uDNS_LLQ_Events);
- const mDNSs32 delay = AddToCFList ? NonZeroTime(m->timenow + mDNSPlatformOneSecond) :
- CheckForSoonToExpireRecords(m, m->rec.r.resrec.name, m->rec.r.resrec.namehash, slot);
- // If unique, assume we may have to delay delivery of this 'add' event.
- // Below, where we walk the CacheFlushRecords list, we either call CacheRecordDeferredAdd()
- // to immediately to generate answer callbacks, or we call ScheduleNextCacheCheckTime()
- // to schedule an mDNS_Execute task at the appropriate time.
- rr = CreateNewCacheEntry(m, slot, cg, delay);
- if (rr)
- {
- if (AddToCFList) { *cfp = rr; cfp = &rr->NextInCFList; *cfp = (CacheRecord*)1; }
- else if (rr->DelayDelivery) ScheduleNextCacheCheckTime(m, slot, rr->DelayDelivery);
- }
- }
- }
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
- }
-
-exit:
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
-
- // If we've just received one or more records with their cache flush bits set,
- // then scan that cache slot to see if there are any old stale records we need to flush
- while (CacheFlushRecords != (CacheRecord*)1)
- {
- CacheRecord *r1 = CacheFlushRecords, *r2;
- const mDNSu32 slot = HashSlot(r1->resrec.name);
- const CacheGroup *cg = CacheGroupForRecord(m, slot, &r1->resrec);
- CacheFlushRecords = CacheFlushRecords->NextInCFList;
- r1->NextInCFList = mDNSNULL;
-
- // Look for records in the cache with the same signature as this new one with the cache flush
- // bit set, and either (a) if they're fresh, just make sure the whole RRSet has the same TTL
- // (as required by DNS semantics) or (b) if they're old, mark them for deletion in one second.
- // We make these TTL adjustments *only* for records that still have *more* than one second
- // remaining to live. Otherwise, a record that we tagged for deletion half a second ago
- // (and now has half a second remaining) could inadvertently get its life extended, by either
- // (a) if we got an explicit goodbye packet half a second ago, the record would be considered
- // "fresh" and would be incorrectly resurrected back to the same TTL as the rest of the RRSet,
- // or (b) otherwise, the record would not be fully resurrected, but would be reset to expire
- // in one second, thereby inadvertently delaying its actual expiration, instead of hastening it.
- // If this were to happen repeatedly, the record's expiration could be deferred indefinitely.
- // To avoid this, we need to ensure that the cache flushing operation will only act to
- // *decrease* a record's remaining lifetime, never *increase* it.
- for (r2 = cg ? cg->members : mDNSNULL; r2; r2=r2->next)
- // For Unicast (null InterfaceID) the DNSservers should also match
- if ((r1->resrec.InterfaceID == r2->resrec.InterfaceID) &&
- (r1->resrec.InterfaceID || (r1->resrec.rDNSServer == r2->resrec.rDNSServer)) &&
- r1->resrec.rrtype == r2->resrec.rrtype &&
- r1->resrec.rrclass == r2->resrec.rrclass)
- {
- // If record is recent, just ensure the whole RRSet has the same TTL (as required by DNS semantics)
- // else, if record is old, mark it to be flushed
- if (m->timenow - r2->TimeRcvd < mDNSPlatformOneSecond && RRExpireTime(r2) - m->timenow > mDNSPlatformOneSecond)
- {
- // If we find mismatched TTLs in an RRSet, correct them.
- // We only do this for records with a TTL of 2 or higher. It's possible to have a
- // goodbye announcement with the cache flush bit set (or a case-change on record rdata,
- // which we treat as a goodbye followed by an addition) and in that case it would be
- // inappropriate to synchronize all the other records to a TTL of 0 (or 1).
- // We suppress the message for the specific case of correcting from 240 to 60 for type TXT,
- // because certain early Bonjour devices are known to have this specific mismatch, and
- // there's no point filling syslog with messages about something we already know about.
- // We also don't log this for uDNS responses, since a caching name server is obliged
- // to give us an aged TTL to correct for how long it has held the record,
- // so our received TTLs are expected to vary in that case
- if (r2->resrec.rroriginalttl != r1->resrec.rroriginalttl && r1->resrec.rroriginalttl > 1)
- {
- if (!(r2->resrec.rroriginalttl == 240 && r1->resrec.rroriginalttl == 60 && r2->resrec.rrtype == kDNSType_TXT) &&
- mDNSOpaque16IsZero(response->h.id))
- LogInfo("Correcting TTL from %4d to %4d for %s",
- r2->resrec.rroriginalttl, r1->resrec.rroriginalttl, CRDisplayString(m, r2));
- r2->resrec.rroriginalttl = r1->resrec.rroriginalttl;
- }
- r2->TimeRcvd = m->timenow;
- }
- else // else, if record is old, mark it to be flushed
- {
- verbosedebugf("Cache flush new %p age %d expire in %d %s", r1, m->timenow - r1->TimeRcvd, RRExpireTime(r1) - m->timenow, CRDisplayString(m, r1));
- verbosedebugf("Cache flush old %p age %d expire in %d %s", r2, m->timenow - r2->TimeRcvd, RRExpireTime(r2) - m->timenow, CRDisplayString(m, r2));
- // We set stale records to expire in one second.
- // This gives the owner a chance to rescue it if necessary.
- // This is important in the case of multi-homing and bridged networks:
- // Suppose host X is on Ethernet. X then connects to an AirPort base station, which happens to be
- // bridged onto the same Ethernet. When X announces its AirPort IP address with the cache-flush bit
- // set, the AirPort packet will be bridged onto the Ethernet, and all other hosts on the Ethernet
- // will promptly delete their cached copies of the (still valid) Ethernet IP address record.
- // By delaying the deletion by one second, we give X a change to notice that this bridging has
- // happened, and re-announce its Ethernet IP address to rescue it from deletion from all our caches.
-
- // We set UnansweredQueries to MaxUnansweredQueries to avoid expensive and unnecessary
- // final expiration queries for this record.
-
- // If a record is deleted twice, first with an explicit DE record, then a second time by virtue of the cache
- // flush bit on the new record replacing it, then we allow the record to be deleted immediately, without the usual
- // one-second grace period. This improves responsiveness for mDNS_Update(), as used for things like iChat status updates.
- // <rdar://problem/5636422> Updating TXT records is too slow
- // We check for "rroriginalttl == 1" because we want to include records tagged by the "packet TTL is zero" check above,
- // which sets rroriginalttl to 1, but not records tagged by the rdata case-change check, which sets rroriginalttl to 0.
- if (r2->TimeRcvd == m->timenow && r2->resrec.rroriginalttl == 1 && r2->UnansweredQueries == MaxUnansweredQueries)
- {
- LogInfo("Cache flush for DE record %s", CRDisplayString(m, r2));
- r2->resrec.rroriginalttl = 0;
- }
- else if (RRExpireTime(r2) - m->timenow > mDNSPlatformOneSecond)
- {
- // We only set a record to expire in one second if it currently has *more* than a second to live
- // If it's already due to expire in a second or less, we just leave it alone
- r2->resrec.rroriginalttl = 1;
- r2->UnansweredQueries = MaxUnansweredQueries;
- r2->TimeRcvd = m->timenow - 1;
- // We use (m->timenow - 1) instead of m->timenow, because we use that to identify records
- // that we marked for deletion via an explicit DE record
- }
- }
- SetNextCacheCheckTimeForRecord(m, r2);
- }
-
- if (r1->DelayDelivery) // If we were planning to delay delivery of this record, see if we still need to
- {
- r1->DelayDelivery = CheckForSoonToExpireRecords(m, r1->resrec.name, r1->resrec.namehash, slot);
- // If no longer delaying, deliver answer now, else schedule delivery for the appropriate time
- if (!r1->DelayDelivery) CacheRecordDeferredAdd(m, r1);
- else ScheduleNextCacheCheckTime(m, slot, r1->DelayDelivery);
- }
- }
-
- // See if we need to generate negative cache entries for unanswered unicast questions
- ptr = response->data;
- for (i = 0; i < response->h.numQuestions && ptr && ptr < end; i++)
- {
- DNSQuestion q;
- DNSQuestion *qptr = mDNSNULL;
- ptr = getQuestion(response, ptr, end, InterfaceID, &q);
- if (ptr && (qptr = ExpectingUnicastResponseForQuestion(m, dstport, response->h.id, &q, !dstaddr)))
- {
- CacheRecord *rr, *neg = mDNSNULL;
- mDNSu32 slot = HashSlot(&q.qname);
- CacheGroup *cg = CacheGroupForName(m, slot, q.qnamehash, &q.qname);
- for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next)
- if (SameNameRecordAnswersQuestion(&rr->resrec, qptr))
- {
- // 1. If we got a fresh answer to this query, then don't need to generate a negative entry
- if (RRExpireTime(rr) - m->timenow > 0) break;
- // 2. If we already had a negative entry, keep track of it so we can resurrect it instead of creating a new one
- if (rr->resrec.RecordType == kDNSRecordTypePacketNegative) neg = rr;
- }
- // When we're doing parallel unicast and multicast queries for dot-local names (for supporting Microsoft
- // Active Directory sites) we don't want to waste memory making negative cache entries for all the unicast answers.
- // Otherwise we just fill up our cache with negative entries for just about every single multicast name we ever look up
- // (since the Microsoft Active Directory server is going to assert that pretty much every single multicast name doesn't exist).
- // This is not only a waste of memory, but there's also the problem of those negative entries confusing us later -- e.g. we
- // suppress sending our mDNS query packet because we think we already have a valid (negative) answer to that query in our cache.
- // The one exception is that we *DO* want to make a negative cache entry for "local. SOA", for the (common) case where we're
- // *not* on a Microsoft Active Directory network, and there is no authoritative server for "local". Note that this is not
- // in conflict with the mDNS spec, because that spec says, "Multicast DNS Zones have no SOA record," so it's okay to cache
- // negative answers for "local. SOA" from a uDNS server, because the mDNS spec already says that such records do not exist :-)
- if (!InterfaceID && q.qtype != kDNSType_SOA && IsLocalDomain(&q.qname))
- {
- // If we did not find a positive answer and we can append search domains to this question,
- // generate a negative response (without creating a cache entry) to append search domains.
- if (qptr->AppendSearchDomains && !rr)
- {
- LogInfo("mDNSCoreReceiveResponse: Generate negative response for %##s (%s)", q.qname.c, DNSTypeName(q.qtype));
- m->CurrentQuestion = qptr;
- GenerateNegativeResponse(m);
- m->CurrentQuestion = mDNSNULL;
- }
- else LogInfo("mDNSCoreReceiveResponse: Skipping check to see if we need to generate a negative cache entry for %##s (%s)", q.qname.c, DNSTypeName(q.qtype));
- }
- else
- {
- if (!rr)
- {
- // We start off assuming a negative caching TTL of 60 seconds
- // but then look to see if we can find an SOA authority record to tell us a better value we should be using
- mDNSu32 negttl = 60;
- int repeat = 0;
- const domainname *name = &q.qname;
- mDNSu32 hash = q.qnamehash;
-
- // Special case for our special Microsoft Active Directory "local SOA" check.
- // Some cheap home gateways don't include an SOA record in the authority section when
- // they send negative responses, so we don't know how long to cache the negative result.
- // Because we don't want to keep hitting the root name servers with our query to find
- // if we're on a network using Microsoft Active Directory using "local" as a private
- // internal top-level domain, we make sure to cache the negative result for at least one day.
- if (q.qtype == kDNSType_SOA && SameDomainName(&q.qname, &localdomain)) negttl = 60 * 60 * 24;
-
- // If we're going to make (or update) a negative entry, then look for the appropriate TTL from the SOA record
- if (response->h.numAuthorities && (ptr = LocateAuthorities(response, end)) != mDNSNULL)
- {
- ptr = GetLargeResourceRecord(m, response, ptr, end, InterfaceID, kDNSRecordTypePacketAuth, &m->rec);
- if (ptr && m->rec.r.resrec.RecordType != kDNSRecordTypePacketNegative && m->rec.r.resrec.rrtype == kDNSType_SOA)
- {
- const rdataSOA *const soa = (const rdataSOA *)m->rec.r.resrec.rdata->u.data;
- mDNSu32 ttl_s = soa->min;
- // We use the lesser of the SOA.MIN field and the SOA record's TTL, *except*
- // for the SOA record for ".", where the record is reported as non-cacheable
- // (TTL zero) for some reason, so in this case we just take the SOA record's TTL as-is
- if (ttl_s > m->rec.r.resrec.rroriginalttl && m->rec.r.resrec.name->c[0])
- ttl_s = m->rec.r.resrec.rroriginalttl;
- if (negttl < ttl_s) negttl = ttl_s;
-
- // Special check for SOA queries: If we queried for a.b.c.d.com, and got no answer,
- // with an Authority Section SOA record for d.com, then this is a hint that the authority
- // is d.com, and consequently SOA records b.c.d.com and c.d.com don't exist either.
- // To do this we set the repeat count so the while loop below will make a series of negative cache entries for us
- if (q.qtype == kDNSType_SOA)
- {
- int qcount = CountLabels(&q.qname);
- int scount = CountLabels(m->rec.r.resrec.name);
- if (qcount - 1 > scount)
- if (SameDomainName(SkipLeadingLabels(&q.qname, qcount - scount), m->rec.r.resrec.name))
- repeat = qcount - 1 - scount;
- }
- }
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
- }
-
- // If we already had a negative entry in the cache, then we double our existing negative TTL. This is to avoid
- // the case where the record doesn't exist (e.g. particularly for things like our lb._dns-sd._udp.<domain> query),
- // and the server returns no SOA record (or an SOA record with a small MIN TTL) so we assume a TTL
- // of 60 seconds, and we end up polling the server every minute for a record that doesn't exist.
- // With this fix in place, when this happens, we double the effective TTL each time (up to one hour),
- // so that we back off our polling rate and don't keep hitting the server continually.
- if (neg)
- {
- if (negttl < neg->resrec.rroriginalttl * 2)
- negttl = neg->resrec.rroriginalttl * 2;
- if (negttl > 3600)
- negttl = 3600;
- }
-
- negttl = GetEffectiveTTL(LLQType, negttl); // Add 25% grace period if necessary
-
- // If we already had a negative cache entry just update it, else make one or more new negative cache entries
- if (neg)
- {
- debugf("mDNSCoreReceiveResponse: Renewing negative TTL from %d to %d %s", neg->resrec.rroriginalttl, negttl, CRDisplayString(m, neg));
- RefreshCacheRecord(m, neg, negttl);
- // When we created the cache for the first time and answered the question, the question's
- // interval was set to MaxQuestionInterval. If the cache is about to expire and we are resending
- // the queries, the interval should still be at MaxQuestionInterval. If the query is being
- // restarted (setting it to InitialQuestionInterval) for other reasons e.g., wakeup,
- // we should reset its question interval here to MaxQuestionInterval.
- ResetQuestionState(m, qptr);
- }
- else while (1)
- {
- debugf("mDNSCoreReceiveResponse making negative cache entry TTL %d for %##s (%s)", negttl, name->c, DNSTypeName(q.qtype));
- MakeNegativeCacheRecord(m, &m->rec.r, name, hash, q.qtype, q.qclass, negttl, mDNSInterface_Any, qptr->qDNSServer);
- CreateNewCacheEntry(m, slot, cg, 0); // We never need any delivery delay for these generated negative cache records
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
- if (!repeat) break;
- repeat--;
- name = (const domainname *)(name->c + 1 + name->c[0]);
- hash = DomainNameHashValue(name);
- slot = HashSlot(name);
- cg = CacheGroupForName(m, slot, hash, name);
- }
- }
- }
- }
- }
- }
-
-// ScheduleWakeup causes all proxy records with WakeUp.HMAC matching mDNSEthAddr 'e' to be deregistered, causing
-// multiple wakeup magic packets to be sent if appropriate, and all records to be ultimately freed after a few seconds.
-// ScheduleWakeup is called on mDNS record conflicts, ARP conflicts, NDP conflicts, or reception of trigger traffic
-// that warrants waking the sleeping host.
-// ScheduleWakeup must be called with the lock held (ScheduleWakeupForList uses mDNS_Deregister_internal)
-
-mDNSlocal void ScheduleWakeupForList(mDNS *const m, mDNSInterfaceID InterfaceID, mDNSEthAddr *e, AuthRecord *const thelist)
- {
- // We don't need to use the m->CurrentRecord mechanism here because the target HMAC is nonzero,
- // so all we're doing is marking the record to generate a few wakeup packets
- AuthRecord *rr;
- if (!e->l[0]) { LogMsg("ScheduleWakeupForList ERROR: Target HMAC is zero"); return; }
- for (rr = thelist; rr; rr = rr->next)
- if (rr->resrec.InterfaceID == InterfaceID && rr->resrec.RecordType != kDNSRecordTypeDeregistering && mDNSSameEthAddress(&rr->WakeUp.HMAC, e))
- {
- LogInfo("ScheduleWakeupForList: Scheduling wakeup packets for %s", ARDisplayString(m, rr));
- mDNS_Deregister_internal(m, rr, mDNS_Dereg_normal);
- }
- }
-
-mDNSlocal void ScheduleWakeup(mDNS *const m, mDNSInterfaceID InterfaceID, mDNSEthAddr *e)
- {
- if (!e->l[0]) { LogMsg("ScheduleWakeup ERROR: Target HMAC is zero"); return; }
- ScheduleWakeupForList(m, InterfaceID, e, m->DuplicateRecords);
- ScheduleWakeupForList(m, InterfaceID, e, m->ResourceRecords);
- }
-
-mDNSlocal void SPSRecordCallback(mDNS *const m, AuthRecord *const ar, mStatus result)
- {
- if (result && result != mStatus_MemFree)
- LogInfo("SPS Callback %d %s", result, ARDisplayString(m, ar));
-
- if (result == mStatus_NameConflict)
- {
- mDNS_Lock(m);
- LogMsg("%-7s Conflicting mDNS -- waking %.6a %s", InterfaceNameForID(m, ar->resrec.InterfaceID), &ar->WakeUp.HMAC, ARDisplayString(m, ar));
- if (ar->WakeUp.HMAC.l[0])
- {
- SendWakeup(m, ar->resrec.InterfaceID, &ar->WakeUp.IMAC, &ar->WakeUp.password); // Send one wakeup magic packet
- ScheduleWakeup(m, ar->resrec.InterfaceID, &ar->WakeUp.HMAC); // Schedule all other records with the same owner to be woken
- }
- mDNS_Unlock(m);
- }
-
- if (result == mStatus_NameConflict || result == mStatus_MemFree)
- {
- m->ProxyRecords--;
- mDNSPlatformMemFree(ar);
- mDNS_UpdateAllowSleep(m);
- }
- }
-
-mDNSlocal void mDNSCoreReceiveUpdate(mDNS *const m,
- const DNSMessage *const msg, const mDNSu8 *end,
- const mDNSAddr *srcaddr, const mDNSIPPort srcport, const mDNSAddr *dstaddr, mDNSIPPort dstport,
- const mDNSInterfaceID InterfaceID)
- {
- int i;
- AuthRecord opt;
- mDNSu8 *p = m->omsg.data;
- OwnerOptData owner = zeroOwner; // Need to zero this, so we'll know if this Update packet was missing its Owner option
- mDNSu32 updatelease = 0;
- const mDNSu8 *ptr;
-
- LogSPS("Received Update from %#-15a:%-5d to %#-15a:%-5d on 0x%p with "
- "%2d Question%s %2d Answer%s %2d Authorit%s %2d Additional%s %d bytes",
- srcaddr, mDNSVal16(srcport), dstaddr, mDNSVal16(dstport), InterfaceID,
- msg->h.numQuestions, msg->h.numQuestions == 1 ? ", " : "s,",
- msg->h.numAnswers, msg->h.numAnswers == 1 ? ", " : "s,",
- msg->h.numAuthorities, msg->h.numAuthorities == 1 ? "y, " : "ies,",
- msg->h.numAdditionals, msg->h.numAdditionals == 1 ? " " : "s", end - msg->data);
-
- if (!InterfaceID || !m->SPSSocket || !mDNSSameIPPort(dstport, m->SPSSocket->port)) return;
-
- if (mDNS_PacketLoggingEnabled)
- DumpPacket(m, mStatus_NoError, mDNSfalse, "UDP", srcaddr, srcport, dstaddr, dstport, msg, end);
-
- ptr = LocateOptRR(msg, end, DNSOpt_LeaseData_Space + DNSOpt_OwnerData_ID_Space);
- if (ptr)
- {
- ptr = GetLargeResourceRecord(m, msg, ptr, end, 0, kDNSRecordTypePacketAdd, &m->rec);
- if (ptr && m->rec.r.resrec.RecordType != kDNSRecordTypePacketNegative && m->rec.r.resrec.rrtype == kDNSType_OPT)
- {
- const rdataOPT *o;
- const rdataOPT *const e = (const rdataOPT *)&m->rec.r.resrec.rdata->u.data[m->rec.r.resrec.rdlength];
- for (o = &m->rec.r.resrec.rdata->u.opt[0]; o < e; o++)
- {
- if (o->opt == kDNSOpt_Lease) updatelease = o->u.updatelease;
- else if (o->opt == kDNSOpt_Owner && o->u.owner.vers == 0) owner = o->u.owner;
- }
- }
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
- }
-
- InitializeDNSMessage(&m->omsg.h, msg->h.id, UpdateRespFlags);
-
- if (!updatelease || !owner.HMAC.l[0])
- {
- static int msgs = 0;
- if (msgs < 100)
- {
- msgs++;
- LogMsg("Refusing sleep proxy registration from %#a:%d:%s%s", srcaddr, mDNSVal16(srcport),
- !updatelease ? " No lease" : "", !owner.HMAC.l[0] ? " No owner" : "");
- }
- m->omsg.h.flags.b[1] |= kDNSFlag1_RC_FormErr;
- }
- else if (m->ProxyRecords + msg->h.mDNS_numUpdates > MAX_PROXY_RECORDS)
- {
- static int msgs = 0;
- if (msgs < 100)
- {
- msgs++;
- LogMsg("Refusing sleep proxy registration from %#a:%d: Too many records %d + %d = %d > %d", srcaddr, mDNSVal16(srcport),
- m->ProxyRecords, msg->h.mDNS_numUpdates, m->ProxyRecords + msg->h.mDNS_numUpdates, MAX_PROXY_RECORDS);
- }
- m->omsg.h.flags.b[1] |= kDNSFlag1_RC_Refused;
- }
- else
- {
- LogSPS("Received Update for H-MAC %.6a I-MAC %.6a Password %.6a seq %d", &owner.HMAC, &owner.IMAC, &owner.password, owner.seq);
-
- if (updatelease > 24 * 60 * 60)
- updatelease = 24 * 60 * 60;
-
- if (updatelease > 0x40000000UL / mDNSPlatformOneSecond)
- updatelease = 0x40000000UL / mDNSPlatformOneSecond;
-
- ptr = LocateAuthorities(msg, end);
- for (i = 0; i < msg->h.mDNS_numUpdates && ptr && ptr < end; i++)
- {
- ptr = GetLargeResourceRecord(m, msg, ptr, end, InterfaceID, kDNSRecordTypePacketAuth, &m->rec);
- if (ptr && m->rec.r.resrec.RecordType != kDNSRecordTypePacketNegative)
- {
- mDNSu16 RDLengthMem = GetRDLengthMem(&m->rec.r.resrec);
- AuthRecord *ar = mDNSPlatformMemAllocate(sizeof(AuthRecord) - sizeof(RDataBody) + RDLengthMem);
- if (!ar) { m->omsg.h.flags.b[1] |= kDNSFlag1_RC_Refused; break; }
- else
- {
- mDNSu8 RecordType = m->rec.r.resrec.RecordType & kDNSRecordTypePacketUniqueMask ? kDNSRecordTypeUnique : kDNSRecordTypeShared;
- m->rec.r.resrec.rrclass &= ~kDNSClass_UniqueRRSet;
- ClearIdenticalProxyRecords(m, &owner, m->DuplicateRecords); // Make sure we don't have any old stale duplicates of this record
- ClearIdenticalProxyRecords(m, &owner, m->ResourceRecords);
- mDNS_SetupResourceRecord(ar, mDNSNULL, InterfaceID, m->rec.r.resrec.rrtype, m->rec.r.resrec.rroriginalttl, RecordType, AuthRecordAny, SPSRecordCallback, ar);
- AssignDomainName(&ar->namestorage, m->rec.r.resrec.name);
- ar->resrec.rdlength = GetRDLength(&m->rec.r.resrec, mDNSfalse);
- ar->resrec.rdata->MaxRDLength = RDLengthMem;
- mDNSPlatformMemCopy(ar->resrec.rdata->u.data, m->rec.r.resrec.rdata->u.data, RDLengthMem);
- ar->ForceMCast = mDNStrue;
- ar->WakeUp = owner;
- if (m->rec.r.resrec.rrtype == kDNSType_PTR)
- {
- mDNSs32 t = ReverseMapDomainType(m->rec.r.resrec.name);
- if (t == mDNSAddrType_IPv4) GetIPv4FromName(&ar->AddressProxy, m->rec.r.resrec.name);
- else if (t == mDNSAddrType_IPv6) GetIPv6FromName(&ar->AddressProxy, m->rec.r.resrec.name);
- debugf("mDNSCoreReceiveUpdate: PTR %d %d %#a %s", t, ar->AddressProxy.type, &ar->AddressProxy, ARDisplayString(m, ar));
- if (ar->AddressProxy.type) SetSPSProxyListChanged(InterfaceID);
- }
- ar->TimeRcvd = m->timenow;
- ar->TimeExpire = m->timenow + updatelease * mDNSPlatformOneSecond;
- if (m->NextScheduledSPS - ar->TimeExpire > 0)
- m->NextScheduledSPS = ar->TimeExpire;
- mDNS_Register_internal(m, ar);
- // Unsolicited Neighbor Advertisements (RFC 2461 Section 7.2.6) give us fast address cache updating,
- // but some older IPv6 clients get confused by them, so for now we don't send them. Without Unsolicited
- // Neighbor Advertisements we have to rely on Neighbor Unreachability Detection instead, which is slower.
- // Given this, we'll do our best to wake for existing IPv6 connections, but we don't want to encourage
- // new ones for sleeping clients, so we'll we send deletions for our SPS clients' AAAA records.
- if (m->KnownBugs & mDNS_KnownBug_LimitedIPv6)
- if (ar->resrec.rrtype == kDNSType_AAAA) ar->resrec.rroriginalttl = 0;
- m->ProxyRecords++;
- mDNS_UpdateAllowSleep(m);
- LogSPS("SPS Registered %4d %X %s", m->ProxyRecords, RecordType, ARDisplayString(m,ar));
- }
- }
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
- }
-
- if (m->omsg.h.flags.b[1] & kDNSFlag1_RC_Mask)
- {
- LogMsg("Refusing sleep proxy registration from %#a:%d: Out of memory", srcaddr, mDNSVal16(srcport));
- ClearProxyRecords(m, &owner, m->DuplicateRecords);
- ClearProxyRecords(m, &owner, m->ResourceRecords);
- }
- else
- {
- mDNS_SetupResourceRecord(&opt, mDNSNULL, mDNSInterface_Any, kDNSType_OPT, kStandardTTL, kDNSRecordTypeKnownUnique, AuthRecordAny, mDNSNULL, mDNSNULL);
- opt.resrec.rrclass = NormalMaxDNSMessageData;
- opt.resrec.rdlength = sizeof(rdataOPT); // One option in this OPT record
- opt.resrec.rdestimate = sizeof(rdataOPT);
- opt.resrec.rdata->u.opt[0].opt = kDNSOpt_Lease;
- opt.resrec.rdata->u.opt[0].u.updatelease = updatelease;
- p = PutResourceRecordTTLWithLimit(&m->omsg, p, &m->omsg.h.numAdditionals, &opt.resrec, opt.resrec.rroriginalttl, m->omsg.data + AbsoluteMaxDNSMessageData);
- }
- }
-
- if (p) mDNSSendDNSMessage(m, &m->omsg, p, InterfaceID, m->SPSSocket, srcaddr, srcport, mDNSNULL, mDNSNULL);
- }
-
-mDNSlocal void mDNSCoreReceiveUpdateR(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *end, const mDNSInterfaceID InterfaceID)
- {
- if (InterfaceID)
- {
- mDNSu32 updatelease = 60 * 60; // If SPS fails to indicate lease time, assume one hour
- const mDNSu8 *ptr = LocateOptRR(msg, end, DNSOpt_LeaseData_Space);
- if (ptr)
- {
- ptr = GetLargeResourceRecord(m, msg, ptr, end, 0, kDNSRecordTypePacketAdd, &m->rec);
- if (ptr && m->rec.r.resrec.RecordType != kDNSRecordTypePacketNegative && m->rec.r.resrec.rrtype == kDNSType_OPT)
- {
- const rdataOPT *o;
- const rdataOPT *const e = (const rdataOPT *)&m->rec.r.resrec.rdata->u.data[m->rec.r.resrec.rdlength];
- for (o = &m->rec.r.resrec.rdata->u.opt[0]; o < e; o++)
- if (o->opt == kDNSOpt_Lease)
- {
- updatelease = o->u.updatelease;
- LogSPS("Sleep Proxy granted lease time %4d seconds", updatelease);
- }
- }
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
- }
-
- if (m->CurrentRecord)
- LogMsg("mDNSCoreReceiveUpdateR ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord));
- m->CurrentRecord = m->ResourceRecords;
- while (m->CurrentRecord)
- {
- AuthRecord *const rr = m->CurrentRecord;
- if (rr->resrec.InterfaceID == InterfaceID || (!rr->resrec.InterfaceID && (rr->ForceMCast || IsLocalDomain(rr->resrec.name))))
- if (mDNSSameOpaque16(rr->updateid, msg->h.id))
- {
- rr->updateid = zeroID;
- rr->expire = NonZeroTime(m->timenow + updatelease * mDNSPlatformOneSecond);
- LogSPS("Sleep Proxy %s record %5d %s", rr->WakeUp.HMAC.l[0] ? "transferred" : "registered", updatelease, ARDisplayString(m,rr));
- if (rr->WakeUp.HMAC.l[0])
- {
- rr->WakeUp.HMAC = zeroEthAddr; // Clear HMAC so that mDNS_Deregister_internal doesn't waste packets trying to wake this host
- rr->RequireGoodbye = mDNSfalse; // and we don't want to send goodbye for it
- mDNS_Deregister_internal(m, rr, mDNS_Dereg_normal);
- }
- }
- // Mustn't advance m->CurrentRecord until *after* mDNS_Deregister_internal, because
- // new records could have been added to the end of the list as a result of that call.
- if (m->CurrentRecord == rr) // If m->CurrentRecord was not advanced for us, do it now
- m->CurrentRecord = rr->next;
- }
- }
- // If we were waiting to go to sleep, then this SPS registration or wide-area record deletion
- // may have been the thing we were waiting for, so schedule another check to see if we can sleep now.
- if (m->SleepLimit) m->NextScheduledSPRetry = m->timenow;
- }
-
-mDNSexport void MakeNegativeCacheRecord(mDNS *const m, CacheRecord *const cr,
- const domainname *const name, const mDNSu32 namehash, const mDNSu16 rrtype, const mDNSu16 rrclass, mDNSu32 ttl_seconds, mDNSInterfaceID InterfaceID, DNSServer *dnsserver)
- {
- if (cr == &m->rec.r && m->rec.r.resrec.RecordType)
- {
- LogMsg("MakeNegativeCacheRecord: m->rec appears to be already in use for %s", CRDisplayString(m, &m->rec.r));
-#if ForceAlerts
- *(long*)0 = 0;
-#endif
- }
-
- // Create empty resource record
- cr->resrec.RecordType = kDNSRecordTypePacketNegative;
- cr->resrec.InterfaceID = InterfaceID;
- cr->resrec.rDNSServer = dnsserver;
- cr->resrec.name = name; // Will be updated to point to cg->name when we call CreateNewCacheEntry
- cr->resrec.rrtype = rrtype;
- cr->resrec.rrclass = rrclass;
- cr->resrec.rroriginalttl = ttl_seconds;
- cr->resrec.rdlength = 0;
- cr->resrec.rdestimate = 0;
- cr->resrec.namehash = namehash;
- cr->resrec.rdatahash = 0;
- cr->resrec.rdata = (RData*)&cr->smallrdatastorage;
- cr->resrec.rdata->MaxRDLength = 0;
-
- cr->NextInKAList = mDNSNULL;
- cr->TimeRcvd = m->timenow;
- cr->DelayDelivery = 0;
- cr->NextRequiredQuery = m->timenow;
- cr->LastUsed = m->timenow;
- cr->CRActiveQuestion = mDNSNULL;
- cr->UnansweredQueries = 0;
- cr->LastUnansweredTime = 0;
-#if ENABLE_MULTI_PACKET_QUERY_SNOOPING
- cr->MPUnansweredQ = 0;
- cr->MPLastUnansweredQT = 0;
- cr->MPUnansweredKA = 0;
- cr->MPExpectingKA = mDNSfalse;
-#endif
- cr->NextInCFList = mDNSNULL;
- }
-
-mDNSexport void mDNSCoreReceive(mDNS *const m, void *const pkt, const mDNSu8 *const end,
- const mDNSAddr *const srcaddr, const mDNSIPPort srcport, const mDNSAddr *dstaddr, const mDNSIPPort dstport,
- const mDNSInterfaceID InterfaceID)
- {
- mDNSInterfaceID ifid = InterfaceID;
- DNSMessage *msg = (DNSMessage *)pkt;
- const mDNSu8 StdQ = kDNSFlag0_QR_Query | kDNSFlag0_OP_StdQuery;
- const mDNSu8 StdR = kDNSFlag0_QR_Response | kDNSFlag0_OP_StdQuery;
- const mDNSu8 UpdQ = kDNSFlag0_QR_Query | kDNSFlag0_OP_Update;
- const mDNSu8 UpdR = kDNSFlag0_QR_Response | kDNSFlag0_OP_Update;
- mDNSu8 QR_OP;
- mDNSu8 *ptr = mDNSNULL;
- mDNSBool TLS = (dstaddr == (mDNSAddr *)1); // For debug logs: dstaddr = 0 means TCP; dstaddr = 1 means TLS
- if (TLS) dstaddr = mDNSNULL;
-
-#ifndef UNICAST_DISABLED
- if (mDNSSameAddress(srcaddr, &m->Router))
- {
-#ifdef _LEGACY_NAT_TRAVERSAL_
- if (mDNSSameIPPort(srcport, SSDPPort) || (m->SSDPSocket && mDNSSameIPPort(dstport, m->SSDPSocket->port)))
- {
- mDNS_Lock(m);
- LNT_ConfigureRouterInfo(m, InterfaceID, pkt, (mDNSu16)(end - (mDNSu8 *)pkt));
- mDNS_Unlock(m);
- return;
- }
-#endif
- if (mDNSSameIPPort(srcport, NATPMPPort))
- {
- mDNS_Lock(m);
- uDNS_ReceiveNATPMPPacket(m, InterfaceID, pkt, (mDNSu16)(end - (mDNSu8 *)pkt));
- mDNS_Unlock(m);
- return;
- }
- }
-#ifdef _LEGACY_NAT_TRAVERSAL_
- else if (m->SSDPSocket && mDNSSameIPPort(dstport, m->SSDPSocket->port)) { debugf("Ignoring SSDP response from %#a:%d", srcaddr, mDNSVal16(srcport)); return; }
-#endif
-
-#endif
- if ((unsigned)(end - (mDNSu8 *)pkt) < sizeof(DNSMessageHeader))
- {
- LogMsg("DNS Message from %#a:%d to %#a:%d length %d too short", srcaddr, mDNSVal16(srcport), dstaddr, mDNSVal16(dstport), end - (mDNSu8 *)pkt);
- return;
- }
- QR_OP = (mDNSu8)(msg->h.flags.b[0] & kDNSFlag0_QROP_Mask);
- // Read the integer parts which are in IETF byte-order (MSB first, LSB second)
- ptr = (mDNSu8 *)&msg->h.numQuestions;
- msg->h.numQuestions = (mDNSu16)((mDNSu16)ptr[0] << 8 | ptr[1]);
- msg->h.numAnswers = (mDNSu16)((mDNSu16)ptr[2] << 8 | ptr[3]);
- msg->h.numAuthorities = (mDNSu16)((mDNSu16)ptr[4] << 8 | ptr[5]);
- msg->h.numAdditionals = (mDNSu16)((mDNSu16)ptr[6] << 8 | ptr[7]);
-
- if (!m) { LogMsg("mDNSCoreReceive ERROR m is NULL"); return; }
-
- // We use zero addresses and all-ones addresses at various places in the code to indicate special values like "no address"
- // If we accept and try to process a packet with zero or all-ones source address, that could really mess things up
- if (srcaddr && !mDNSAddressIsValid(srcaddr)) { debugf("mDNSCoreReceive ignoring packet from %#a", srcaddr); return; }
-
- mDNS_Lock(m);
- m->PktNum++;
-#ifndef UNICAST_DISABLED
- if (!dstaddr || (!mDNSAddressIsAllDNSLinkGroup(dstaddr) && (QR_OP == StdR || QR_OP == UpdR)))
- if (!mDNSOpaque16IsZero(msg->h.id)) // uDNS_ReceiveMsg only needs to get real uDNS responses, not "QU" mDNS responses
- {
- ifid = mDNSInterface_Any;
- if (mDNS_PacketLoggingEnabled)
- DumpPacket(m, mStatus_NoError, mDNSfalse, TLS ? "TLS" : !dstaddr ? "TCP" : "UDP", srcaddr, srcport, dstaddr, dstport, msg, end);
- uDNS_ReceiveMsg(m, msg, end, srcaddr, srcport);
- // Note: mDNSCore also needs to get access to received unicast responses
- }
-#endif
- if (QR_OP == StdQ) mDNSCoreReceiveQuery (m, msg, end, srcaddr, srcport, dstaddr, dstport, ifid);
- else if (QR_OP == StdR) mDNSCoreReceiveResponse(m, msg, end, srcaddr, srcport, dstaddr, dstport, ifid);
- else if (QR_OP == UpdQ) mDNSCoreReceiveUpdate (m, msg, end, srcaddr, srcport, dstaddr, dstport, InterfaceID);
- else if (QR_OP == UpdR) mDNSCoreReceiveUpdateR (m, msg, end, InterfaceID);
- else
- {
- LogMsg("Unknown DNS packet type %02X%02X from %#-15a:%-5d to %#-15a:%-5d length %d on %p (ignored)",
- msg->h.flags.b[0], msg->h.flags.b[1], srcaddr, mDNSVal16(srcport), dstaddr, mDNSVal16(dstport), end - (mDNSu8 *)pkt, InterfaceID);
- if (mDNS_LoggingEnabled)
- {
- int i = 0;
- while (i<end - (mDNSu8 *)pkt)
- {
- char buffer[128];
- char *p = buffer + mDNS_snprintf(buffer, sizeof(buffer), "%04X", i);
- do if (i<end - (mDNSu8 *)pkt) p += mDNS_snprintf(p, sizeof(buffer), " %02X", ((mDNSu8 *)pkt)[i]); while (++i & 15);
- LogInfo("%s", buffer);
- }
- }
- }
- // Packet reception often causes a change to the task list:
- // 1. Inbound queries can cause us to need to send responses
- // 2. Conflicing response packets received from other hosts can cause us to need to send defensive responses
- // 3. Other hosts announcing deletion of shared records can cause us to need to re-assert those records
- // 4. Response packets that answer questions may cause our client to issue new questions
- mDNS_Unlock(m);
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - Searcher Functions
-#endif
-
-// Targets are considered the same if both queries are untargeted, or
-// if both are targeted to the same address+port
-// (If Target address is zero, TargetPort is undefined)
-#define SameQTarget(A,B) (((A)->Target.type == mDNSAddrType_None && (B)->Target.type == mDNSAddrType_None) || \
- (mDNSSameAddress(&(A)->Target, &(B)->Target) && mDNSSameIPPort((A)->TargetPort, (B)->TargetPort)))
-
-// Note: We explicitly disallow making a public query be a duplicate of a private one. This is to avoid the
-// circular deadlock where a client does a query for something like "dns-sd -Q _dns-query-tls._tcp.company.com SRV"
-// and we have a key for company.com, so we try to locate the private query server for company.com, which necessarily entails
-// doing a standard DNS query for the _dns-query-tls._tcp SRV record for company.com. If we make the latter (public) query
-// a duplicate of the former (private) query, then it will block forever waiting for an answer that will never come.
-//
-// We keep SuppressUnusable questions separate so that we can return a quick response to them and not get blocked behind
-// the queries that are not marked SuppressUnusable. But if the query is not suppressed, they are treated the same as
-// non-SuppressUnusable questions. This should be fine as the goal of SuppressUnusable is to return quickly only if it
-// is suppressed. If it is not suppressed, we do try all the DNS servers for valid answers like any other question.
-// The main reason for this design is that cache entries point to a *single* question and that question is responsible
-// for keeping the cache fresh as long as it is active. Having multiple active question for a single cache entry
-// breaks this design principle.
-
-// If IsLLQ(Q) is true, it means the question is both:
-// (a) long-lived and
-// (b) being performed by a unicast DNS long-lived query (either full LLQ, or polling)
-// for multicast questions, we don't want to treat LongLived as anything special
-#define IsLLQ(Q) ((Q)->LongLived && !mDNSOpaque16IsZero((Q)->TargetQID))
-
-mDNSlocal DNSQuestion *FindDuplicateQuestion(const mDNS *const m, const DNSQuestion *const question)
- {
- DNSQuestion *q;
- // Note: A question can only be marked as a duplicate of one that occurs *earlier* in the list.
- // This prevents circular references, where two questions are each marked as a duplicate of the other.
- // Accordingly, we break out of the loop when we get to 'question', because there's no point searching
- // further in the list.
- for (q = m->Questions; q && q != question; q=q->next) // Scan our list for another question
- if (q->InterfaceID == question->InterfaceID && // with the same InterfaceID,
- SameQTarget(q, question) && // and same unicast/multicast target settings
- q->qtype == question->qtype && // type,
- q->qclass == question->qclass && // class,
- IsLLQ(q) == IsLLQ(question) && // and long-lived status matches
- (!q->AuthInfo || question->AuthInfo) && // to avoid deadlock, don't make public query dup of a private one
- (q->SuppressQuery == question->SuppressQuery) && // Questions that are suppressed/not suppressed
- q->qnamehash == question->qnamehash &&
- SameDomainName(&q->qname, &question->qname)) // and name
- return(q);
- return(mDNSNULL);
- }
-
-// This is called after a question is deleted, in case other identical questions were being suppressed as duplicates
-mDNSlocal void UpdateQuestionDuplicates(mDNS *const m, DNSQuestion *const question)
- {
- DNSQuestion *q;
- DNSQuestion *first = mDNSNULL;
-
- // This is referring to some other question as duplicate. No other question can refer to this
- // question as a duplicate.
- if (question->DuplicateOf)
- {
- LogInfo("UpdateQuestionDuplicates: question %p %##s (%s) duplicate of %p %##s (%s)",
- question, question->qname.c, DNSTypeName(question->qtype),
- question->DuplicateOf, question->DuplicateOf->qname.c, DNSTypeName(question->DuplicateOf->qtype));
- return;
- }
-
- for (q = m->Questions; q; q=q->next) // Scan our list of questions
- if (q->DuplicateOf == question) // To see if any questions were referencing this as their duplicate
- {
- q->DuplicateOf = first;
- if (!first)
- {
- first = q;
- // If q used to be a duplicate, but now is not,
- // then inherit the state from the question that's going away
- q->LastQTime = question->LastQTime;
- q->ThisQInterval = question->ThisQInterval;
- q->ExpectUnicastResp = question->ExpectUnicastResp;
- q->LastAnswerPktNum = question->LastAnswerPktNum;
- q->RecentAnswerPkts = question->RecentAnswerPkts;
- q->RequestUnicast = question->RequestUnicast;
- q->LastQTxTime = question->LastQTxTime;
- q->CNAMEReferrals = question->CNAMEReferrals;
- q->nta = question->nta;
- q->servAddr = question->servAddr;
- q->servPort = question->servPort;
- q->qDNSServer = question->qDNSServer;
- q->validDNSServers = question->validDNSServers;
- q->unansweredQueries = question->unansweredQueries;
- q->noServerResponse = question->noServerResponse;
- q->triedAllServersOnce = question->triedAllServersOnce;
-
- q->TargetQID = question->TargetQID;
- q->LocalSocket = question->LocalSocket;
-
- q->state = question->state;
- // q->tcp = question->tcp;
- q->ReqLease = question->ReqLease;
- q->expire = question->expire;
- q->ntries = question->ntries;
- q->id = question->id;
-
- question->LocalSocket = mDNSNULL;
- question->nta = mDNSNULL; // If we've got a GetZoneData in progress, transfer it to the newly active question
- // question->tcp = mDNSNULL;
-
- if (q->LocalSocket)
- debugf("UpdateQuestionDuplicates transferred LocalSocket pointer for %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
-
- if (q->nta)
- {
- LogInfo("UpdateQuestionDuplicates transferred nta pointer for %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- q->nta->ZoneDataContext = q;
- }
-
- // Need to work out how to safely transfer this state too -- appropriate context pointers need to be updated or the code will crash
- if (question->tcp) LogInfo("UpdateQuestionDuplicates did not transfer tcp pointer");
-
- if (question->state == LLQ_Established)
- {
- LogInfo("UpdateQuestionDuplicates transferred LLQ state for %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- question->state = 0; // Must zero question->state, or mDNS_StopQuery_internal will clean up and cancel our LLQ from the server
- }
-
- SetNextQueryTime(m,q);
- }
- }
- }
-
-mDNSexport McastResolver *mDNS_AddMcastResolver(mDNS *const m, const domainname *d, const mDNSInterfaceID interface, mDNSu32 timeout)
- {
- McastResolver **p = &m->McastResolvers;
- McastResolver *tmp = mDNSNULL;
-
- if (!d) d = (const domainname *)"";
-
- LogInfo("mDNS_AddMcastResolver: Adding %##s, InterfaceID %p, timeout %u", d->c, interface, timeout);
-
- if (m->mDNS_busy != m->mDNS_reentrancy+1)
- LogMsg("mDNS_AddMcastResolver: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy);
-
- while (*p) // Check if we already have this {interface, domain} tuple registered
- {
- if ((*p)->interface == interface && SameDomainName(&(*p)->domain, d))
- {
- if (!((*p)->flags & DNSServer_FlagDelete)) LogMsg("Note: Mcast Resolver domain %##s (%p) registered more than once", d->c, interface);
- (*p)->flags &= ~DNSServer_FlagDelete;
- tmp = *p;
- *p = tmp->next;
- tmp->next = mDNSNULL;
- }
- else
- p=&(*p)->next;
- }
-
- if (tmp) *p = tmp; // move to end of list, to ensure ordering from platform layer
- else
- {
- // allocate, add to list
- *p = mDNSPlatformMemAllocate(sizeof(**p));
- if (!*p) LogMsg("mDNS_AddMcastResolver: ERROR!! - malloc");
- else
- {
- (*p)->interface = interface;
- (*p)->flags = DNSServer_FlagNew;
- (*p)->timeout = timeout;
- AssignDomainName(&(*p)->domain, d);
- (*p)->next = mDNSNULL;
- }
- }
- return(*p);
- }
-
-mDNSinline mDNSs32 PenaltyTimeForServer(mDNS *m, DNSServer *server)
- {
- mDNSs32 ptime = 0;
- if (server->penaltyTime != 0)
- {
- ptime = server->penaltyTime - m->timenow;
- if (ptime < 0)
- {
- // This should always be a positive value between 0 and DNSSERVER_PENALTY_TIME
- // If it does not get reset in ResetDNSServerPenalties for some reason, we do it
- // here
- LogMsg("PenaltyTimeForServer: PenaltyTime negative %d, (server penaltyTime %d, timenow %d) resetting the penalty",
- ptime, server->penaltyTime, m->timenow);
- server->penaltyTime = 0;
- ptime = 0;
- }
- }
- return ptime;
- }
-
-//Checks to see whether the newname is a better match for the name, given the best one we have
-//seen so far (given in bestcount).
-//Returns -1 if the newname is not a better match
-//Returns 0 if the newname is the same as the old match
-//Returns 1 if the newname is a better match
-mDNSlocal int BetterMatchForName(const domainname *name, int namecount, const domainname *newname, int newcount,
- int bestcount)
- {
- // If the name contains fewer labels than the new server's domain or the new name
- // contains fewer labels than the current best, then it can't possibly be a better match
- if (namecount < newcount || newcount < bestcount) return -1;
-
- // If there is no match, return -1 and the caller will skip this newname for
- // selection
- //
- // If we find a match and the number of labels is the same as bestcount, then
- // we return 0 so that the caller can do additional logic to pick one of
- // the best based on some other factors e.g., penaltyTime
- //
- // If we find a match and the number of labels is more than bestcount, then we
- // return 1 so that the caller can pick this over the old one.
- //
- // Note: newcount can either be equal or greater than bestcount beause of the
- // check above.
-
- if (SameDomainName(SkipLeadingLabels(name, namecount - newcount), newname))
- return bestcount == newcount ? 0 : 1;
- else
- return -1;
- }
-
-// Normally, we have McastResolvers for .local, in-addr.arpa and ip6.arpa. But there
-// can be queries that can forced to multicast (ForceMCast) even though they don't end in these
-// names. In that case, we give a default timeout of 5 seconds
-#define DEFAULT_MCAST_TIMEOUT 5
-mDNSlocal mDNSu32 GetTimeoutForMcastQuestion(mDNS *m, DNSQuestion *question)
- {
- McastResolver *curmatch = mDNSNULL;
- int bestmatchlen = -1, namecount = CountLabels(&question->qname);
- McastResolver *curr;
- int bettermatch, currcount;
- for (curr = m->McastResolvers; curr; curr = curr->next)
- {
- currcount = CountLabels(&curr->domain);
- bettermatch = BetterMatchForName(&question->qname, namecount, &curr->domain, currcount, bestmatchlen);
- // Take the first best match. If there are multiple equally good matches (bettermatch = 0), we take
- // the timeout value from the first one
- if (bettermatch == 1)
- {
- curmatch = curr;
- bestmatchlen = currcount;
- }
- }
- LogInfo("GetTimeoutForMcastQuestion: question %##s curmatch %p, Timeout %d", question->qname.c, curmatch,
- curmatch ? curmatch->timeout : DEFAULT_MCAST_TIMEOUT);
- return ( curmatch ? curmatch->timeout : DEFAULT_MCAST_TIMEOUT);
- }
-
-// Returns true if it is a Domain Enumeration Query
-mDNSexport mDNSBool DomainEnumQuery(const domainname *qname)
- {
- const mDNSu8 *mDNS_DEQLabels[] = { (const mDNSu8 *)"\001b", (const mDNSu8 *)"\002db", (const mDNSu8 *)"\002lb",
- (const mDNSu8 *)"\001r", (const mDNSu8 *)"\002dr", (const mDNSu8 *)mDNSNULL, };
- const domainname *d = qname;
- const mDNSu8 *label;
- int i = 0;
-
- // We need at least 3 labels (DEQ prefix) + one more label to make a meaningful DE query
- if (CountLabels(qname) < 4) { debugf("DomainEnumQuery: question %##s, not enough labels", qname->c); return mDNSfalse; }
-
- label = (const mDNSu8 *)d;
- while (mDNS_DEQLabels[i] != (const mDNSu8 *)mDNSNULL)
- {
- if (SameDomainLabel(mDNS_DEQLabels[i], label)) {debugf("DomainEnumQuery: DEQ %##s, label1 match", qname->c); break;}
- i++;
- }
- if (mDNS_DEQLabels[i] == (const mDNSu8 *)mDNSNULL)
- {
- debugf("DomainEnumQuery: Not a DEQ %##s, label1 mismatch", qname->c);
- return mDNSfalse;
- }
- debugf("DomainEnumQuery: DEQ %##s, label1 match", qname->c);
-
- // CountLabels already verified the number of labels
- d = (const domainname *)(d->c + 1 + d->c[0]); // Second Label
- label = (const mDNSu8 *)d;
- if (!SameDomainLabel(label, (const mDNSu8 *)"\007_dns-sd"))
- {
- debugf("DomainEnumQuery: Not a DEQ %##s, label2 mismatch", qname->c);
- return(mDNSfalse);
- }
- debugf("DomainEnumQuery: DEQ %##s, label2 match", qname->c);
-
- d = (const domainname *)(d->c + 1 + d->c[0]); // Third Label
- label = (const mDNSu8 *)d;
- if (!SameDomainLabel(label, (const mDNSu8 *)"\004_udp"))
- {
- debugf("DomainEnumQuery: Not a DEQ %##s, label3 mismatch", qname->c);
- return(mDNSfalse);
- }
- debugf("DomainEnumQuery: DEQ %##s, label3 match", qname->c);
-
- debugf("DomainEnumQuery: Question %##s is a Domain Enumeration query", qname->c);
-
- return mDNStrue;
- }
-
-// Sets all the Valid DNS servers for a question
-mDNSexport mDNSu32 SetValidDNSServers(mDNS *m, DNSQuestion *question)
- {
- DNSServer *curmatch = mDNSNULL;
- int bestmatchlen = -1, namecount = CountLabels(&question->qname);
- DNSServer *curr;
- int bettermatch, currcount;
- int index = 0;
- mDNSu32 timeout = 0;
- mDNSBool DEQuery;
-
- question->validDNSServers = zeroOpaque64;
- DEQuery = DomainEnumQuery(&question->qname);
- for (curr = m->DNSServers; curr; curr = curr->next)
- {
- debugf("SetValidDNSServers: Parsing DNS server Address %#a (Domain %##s), Scope: %d", &curr->addr, curr->domain.c, curr->scoped);
- // skip servers that will soon be deleted
- if (curr->flags & DNSServer_FlagDelete)
- { debugf("SetValidDNSServers: Delete set for index %d, DNS server %#a (Domain %##s), scoped %d", index, &curr->addr, curr->domain.c, curr->scoped); continue; }
-
- // This happens normally when you unplug the interface where we reset the interfaceID to mDNSInterface_Any for all
- // the DNS servers whose scope match the interfaceID. Few seconds later, we also receive the updated DNS configuration.
- // But any questions that has mDNSInterface_Any scope that are started/restarted before we receive the update
- // (e.g., CheckSuppressUnusableQuestions is called when interfaces are deregistered with the core) should not
- // match the scoped entries by mistake.
- //
- // Note: DNS configuration change will help pick the new dns servers but currently it does not affect the timeout
-
- if (curr->scoped && curr->interface == mDNSInterface_Any)
- { debugf("SetValidDNSServers: Scoped DNS server %#a (Domain %##s) with Interface Any", &curr->addr, curr->domain.c); continue; }
-
- currcount = CountLabels(&curr->domain);
- if ((!DEQuery || !curr->cellIntf) &&
- ((!curr->scoped && (!question->InterfaceID || (question->InterfaceID == mDNSInterface_Unicast))) ||
- (curr->interface == question->InterfaceID)))
- {
- bettermatch = BetterMatchForName(&question->qname, namecount, &curr->domain, currcount, bestmatchlen);
-
- // If we found a better match (bettermatch == 1) then clear all the bits
- // corresponding to the old DNSServers that we have may set before and start fresh.
- // If we find an equal match, then include that DNSServer also by setting the corresponding
- // bit
- if ((bettermatch == 1) || (bettermatch == 0))
- {
- curmatch = curr;
- bestmatchlen = currcount;
- if (bettermatch) { debugf("SetValidDNSServers: Resetting all the bits"); question->validDNSServers = zeroOpaque64; timeout = 0; }
- debugf("SetValidDNSServers: question %##s Setting the bit for DNS server Address %#a (Domain %##s), Scoped:%d index %d,"
- " Timeout %d, interface %p", question->qname.c, &curr->addr, curr->domain.c, curr->scoped, index, curr->timeout,
- curr->interface);
- timeout += curr->timeout;
- if (DEQuery) debugf("DomainEnumQuery: Question %##s, DNSServer %#a, cell %d", question->qname.c, &curr->addr, curr->cellIntf);
- bit_set_opaque64(question->validDNSServers, index);
- }
- }
- index++;
- }
- question->noServerResponse = 0;
-
- debugf("SetValidDNSServers: ValidDNSServer bits 0x%x%x for question %p %##s (%s)",
- question->validDNSServers.l[1], question->validDNSServers.l[0], question, question->qname.c, DNSTypeName(question->qtype));
- // If there are no matching resolvers, then use the default value to timeout
- return (timeout ? timeout : DEFAULT_UDNS_TIMEOUT);
- }
-
-// Get the Best server that matches a name. If you find penalized servers, look for the one
-// that will come out of the penalty box soon
-mDNSlocal DNSServer *GetBestServer(mDNS *m, const domainname *name, mDNSInterfaceID InterfaceID, mDNSOpaque64 validBits, int *selected, mDNSBool nameMatch)
- {
- DNSServer *curmatch = mDNSNULL;
- int bestmatchlen = -1, namecount = name ? CountLabels(name) : 0;
- DNSServer *curr;
- mDNSs32 bestPenaltyTime, currPenaltyTime;
- int bettermatch, currcount;
- int index = 0;
- int currindex = -1;
-
- debugf("GetBestServer: ValidDNSServer bits 0x%x%x", validBits.l[1], validBits.l[0]);
- bestPenaltyTime = DNSSERVER_PENALTY_TIME + 1;
- for (curr = m->DNSServers; curr; curr = curr->next)
- {
- // skip servers that will soon be deleted
- if (curr->flags & DNSServer_FlagDelete)
- { debugf("GetBestServer: Delete set for index %d, DNS server %#a (Domain %##s), scoped %d", index, &curr->addr, curr->domain.c, curr->scoped); continue; }
-
- // Check if this is a valid DNSServer
- if (!bit_get_opaque64(validBits, index)) { debugf("GetBestServer: continuing for index %d", index); index++; continue; }
-
- currcount = CountLabels(&curr->domain);
- currPenaltyTime = PenaltyTimeForServer(m, curr);
-
- debugf("GetBestServer: Address %#a (Domain %##s), PenaltyTime(abs) %d, PenaltyTime(rel) %d",
- &curr->addr, curr->domain.c, curr->penaltyTime, currPenaltyTime);
-
- // If there are multiple best servers for a given question, we will pick the first one
- // if none of them are penalized. If some of them are penalized in that list, we pick
- // the least penalized one. BetterMatchForName walks through all best matches and
- // "currPenaltyTime < bestPenaltyTime" check lets us either pick the first best server
- // in the list when there are no penalized servers and least one among them
- // when there are some penalized servers
- //
- // Notes on InterfaceID matching:
- //
- // 1) A DNSServer entry may have an InterfaceID but the scoped flag may not be set. This
- // is the old way of specifying an InterfaceID option for DNSServer. We recoginize these
- // entries by "scoped" being false. These are like any other unscoped entries except that
- // if it is picked e.g., domain match, when the packet is sent out later, the packet will
- // be sent out on that interface. Theese entries can be matched by either specifying a
- // zero InterfaceID or non-zero InterfaceID on the question. Specifying an InterfaceID on
- // the question will cause an extra check on matching the InterfaceID on the question
- // against the DNSServer.
- //
- // 2) A DNSServer may also have both scoped set and InterfaceID non-NULL. This
- // is the new way of specifying an InterfaceID option for DNSServer. These will be considered
- // only when the question has non-zero interfaceID.
-
- if ((!curr->scoped && !InterfaceID) || (curr->interface == InterfaceID))
- {
-
- // If we know that all the names are already equally good matches, then skip calling BetterMatchForName.
- // This happens when we initially walk all the DNS servers and set the validity bit on the question.
- // Actually we just need PenaltyTime match, but for the sake of readability we just skip the expensive
- // part and still do some redundant steps e.g., InterfaceID match
-
- if (nameMatch) bettermatch = BetterMatchForName(name, namecount, &curr->domain, currcount, bestmatchlen);
- else bettermatch = 0;
-
- // If we found a better match (bettermatch == 1) then we don't need to
- // compare penalty times. But if we found an equal match, then we compare
- // the penalty times to pick a better match
-
- if ((bettermatch == 1) || ((bettermatch == 0) && currPenaltyTime < bestPenaltyTime))
- { currindex = index; curmatch = curr; bestmatchlen = currcount; bestPenaltyTime = currPenaltyTime; }
- }
- index++;
- }
- if (selected) *selected = currindex;
- return curmatch;
- }
-
-// Look up a DNS Server, matching by name and InterfaceID
-mDNSexport DNSServer *GetServerForName(mDNS *m, const domainname *name, mDNSInterfaceID InterfaceID)
- {
- DNSServer *curmatch = mDNSNULL;
- char *ifname = mDNSNULL; // for logging purposes only
- mDNSOpaque64 allValid;
-
- if ((InterfaceID == mDNSInterface_Unicast) || (InterfaceID == mDNSInterface_LocalOnly))
- InterfaceID = mDNSNULL;
-
- if (InterfaceID) ifname = InterfaceNameForID(m, InterfaceID);
-
- // By passing in all ones, we make sure that every DNS server is considered
- allValid.l[0] = allValid.l[1] = 0xFFFFFFFF;
-
- curmatch = GetBestServer(m, name, InterfaceID, allValid, mDNSNULL, mDNStrue);
-
- if (curmatch != mDNSNULL)
- LogInfo("GetServerForName: DNS server %#a:%d (Penalty Time Left %d) (Scope %s:%p) found for name %##s", &curmatch->addr,
- mDNSVal16(curmatch->port), (curmatch->penaltyTime ? (curmatch->penaltyTime - m->timenow) : 0), ifname ? ifname : "None",
- InterfaceID, name);
- else
- LogInfo("GetServerForName: no DNS server (Scope %s:%p) found for name %##s", ifname ? ifname : "None", InterfaceID, name);
-
- return(curmatch);
- }
-
-// Look up a DNS Server for a question within its valid DNSServer bits
-mDNSexport DNSServer *GetServerForQuestion(mDNS *m, DNSQuestion *question)
- {
- DNSServer *curmatch = mDNSNULL;
- char *ifname = mDNSNULL; // for logging purposes only
- mDNSInterfaceID InterfaceID = question->InterfaceID;
- const domainname *name = &question->qname;
- int currindex;
-
- if ((InterfaceID == mDNSInterface_Unicast) || (InterfaceID == mDNSInterface_LocalOnly))
- InterfaceID = mDNSNULL;
-
- if (InterfaceID) ifname = InterfaceNameForID(m, InterfaceID);
-
- if (!mDNSOpaque64IsZero(&question->validDNSServers))
- {
- curmatch = GetBestServer(m, name, InterfaceID, question->validDNSServers, &currindex, mDNSfalse);
- if (currindex != -1) bit_clr_opaque64(question->validDNSServers, currindex);
- }
-
- if (curmatch != mDNSNULL)
- LogInfo("GetServerForQuestion: %p DNS server %#a:%d (Penalty Time Left %d) (Scope %s:%p) found for name %##s (%s)", question, &curmatch->addr,
- mDNSVal16(curmatch->port), (curmatch->penaltyTime ? (curmatch->penaltyTime - m->timenow) : 0), ifname ? ifname : "None",
- InterfaceID, name, DNSTypeName(question->qtype));
- else
- LogInfo("GetServerForQuestion: %p no DNS server (Scope %s:%p) found for name %##s (%s)", question, ifname ? ifname : "None", InterfaceID, name, DNSTypeName(question->qtype));
-
- return(curmatch);
- }
-
-
-#define ValidQuestionTarget(Q) (((Q)->Target.type == mDNSAddrType_IPv4 || (Q)->Target.type == mDNSAddrType_IPv6) && \
- (mDNSSameIPPort((Q)->TargetPort, UnicastDNSPort) || mDNSSameIPPort((Q)->TargetPort, MulticastDNSPort)))
-
-// Called in normal client context (lock not held)
-mDNSlocal void LLQNATCallback(mDNS *m, NATTraversalInfo *n)
- {
- DNSQuestion *q;
- (void)n; // Unused
- mDNS_Lock(m);
- LogInfo("LLQNATCallback external address:port %.4a:%u, NAT result %d", &n->ExternalAddress, mDNSVal16(n->ExternalPort), n->Result);
- for (q = m->Questions; q; q=q->next)
- if (ActiveQuestion(q) && !mDNSOpaque16IsZero(q->TargetQID) && q->LongLived)
- startLLQHandshake(m, q); // If ExternalPort is zero, will do StartLLQPolling instead
-#if APPLE_OSX_mDNSResponder
- UpdateAutoTunnelDomainStatuses(m);
-#endif
- mDNS_Unlock(m);
- }
-
-mDNSlocal mDNSBool ShouldSuppressQuery(mDNS *const m, domainname *qname, mDNSu16 qtype, mDNSInterfaceID InterfaceID)
- {
- NetworkInterfaceInfo *i;
- mDNSs32 iptype;
- DomainAuthInfo *AuthInfo;
-
- if (qtype == kDNSType_A) iptype = mDNSAddrType_IPv4;
- else if (qtype == kDNSType_AAAA) iptype = mDNSAddrType_IPv6;
- else { LogInfo("ShouldSuppressQuery: Query not suppressed for %##s, qtype %s, not A/AAAA type", qname, DNSTypeName(qtype)); return mDNSfalse; }
-
- // We still want the ability to be able to listen to the local services and hence
- // don't fail .local requests. We always have a loopback interface which we don't
- // check here.
- if (InterfaceID != mDNSInterface_Unicast && IsLocalDomain(qname)) { LogInfo("ShouldSuppressQuery: Query not suppressed for %##s, qtype %s, Local question", qname, DNSTypeName(qtype)); return mDNSfalse; }
-
- // Skip Private domains as we have special addresses to get the hosts in the Private domain
- AuthInfo = GetAuthInfoForName_internal(m, qname);
- if (AuthInfo && !AuthInfo->deltime && AuthInfo->AutoTunnel)
- { LogInfo("ShouldSuppressQuery: Query not suppressed for %##s, qtype %s, Private Domain", qname, DNSTypeName(qtype)); return mDNSfalse; }
-
- // Match on Type, Address and InterfaceID
- //
- // Check whether we are looking for a name that ends in .local, then presence of a link-local
- // address on the interface is sufficient.
- for (i = m->HostInterfaces; i; i = i->next)
- {
- if (i->ip.type != iptype) continue;
-
- if (!InterfaceID || (InterfaceID == mDNSInterface_LocalOnly) || (InterfaceID == mDNSInterface_P2P) ||
- (InterfaceID == mDNSInterface_Unicast) || (i->InterfaceID == InterfaceID))
- {
- if (iptype == mDNSAddrType_IPv4 && !mDNSv4AddressIsLoopback(&i->ip.ip.v4) && !mDNSv4AddressIsLinkLocal(&i->ip.ip.v4))
- {
- LogInfo("ShouldSuppressQuery: Query not suppressed for %##s, qtype %s, Local Address %.4a found", qname, DNSTypeName(qtype),
- &i->ip.ip.v4);
- return mDNSfalse;
- }
- else if (iptype == mDNSAddrType_IPv6 &&
- !mDNSv6AddressIsLoopback(&i->ip.ip.v6) &&
- !mDNSv6AddressIsLinkLocal(&i->ip.ip.v6) &&
- !mDNSSameIPv6Address(i->ip.ip.v6, m->AutoTunnelHostAddr) &&
- !mDNSSameIPv6Address(i->ip.ip.v6, m->AutoTunnelRelayAddrOut))
- {
- LogInfo("ShouldSuppressQuery: Query not suppressed for %##s, qtype %s, Local Address %.16a found", qname, DNSTypeName(qtype),
- &i->ip.ip.v6);
- return mDNSfalse;
- }
- }
- }
- LogInfo("ShouldSuppressQuery: Query suppressed for %##s, qtype %s, because no matching interface found", qname, DNSTypeName(qtype));
- return mDNStrue;
- }
-
-mDNSlocal void CacheRecordRmvEventsForCurrentQuestion(mDNS *const m, DNSQuestion *q)
- {
- CacheRecord *rr;
- mDNSu32 slot;
- CacheGroup *cg;
-
- slot = HashSlot(&q->qname);
- cg = CacheGroupForName(m, slot, q->qnamehash, &q->qname);
- for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next)
- {
- // Don't deliver RMV events for negative records
- if (rr->resrec.RecordType == kDNSRecordTypePacketNegative)
- {
- LogInfo("CacheRecordRmvEventsForCurrentQuestion: CacheRecord %s Suppressing RMV events for question %p %##s (%s), CRActiveQuestion %p, CurrentAnswers %d",
- CRDisplayString(m, rr), q, q->qname.c, DNSTypeName(q->qtype), rr->CRActiveQuestion, q->CurrentAnswers);
- continue;
- }
-
- if (SameNameRecordAnswersQuestion(&rr->resrec, q))
- {
- LogInfo("CacheRecordRmvEventsForCurrentQuestion: Calling AnswerCurrentQuestionWithResourceRecord (RMV) for question %##s using resource record %s LocalAnswers %d",
- q->qname.c, CRDisplayString(m, rr), q->LOAddressAnswers);
-
- q->CurrentAnswers--;
- if (rr->resrec.rdlength > SmallRecordLimit) q->LargeAnswers--;
- if (rr->resrec.RecordType & kDNSRecordTypePacketUniqueMask) q->UniqueAnswers--;
-
- if (rr->CRActiveQuestion == q)
- {
- DNSQuestion *qptr;
- // If this was the active question for this cache entry, it was the one that was
- // responsible for keeping the cache entry fresh when the cache entry was reaching
- // its expiry. We need to handover the responsibility to someone else. Otherwise,
- // when the cache entry is about to expire, we won't find an active question
- // (pointed by CRActiveQuestion) to refresh the cache.
- for (qptr = m->Questions; qptr; qptr=qptr->next)
- if (qptr != q && ActiveQuestion(qptr) && ResourceRecordAnswersQuestion(&rr->resrec, qptr))
- break;
-
- if (qptr)
- LogInfo("CacheRecordRmvEventsForCurrentQuestion: Updating CRActiveQuestion to %p for cache record %s, "
- "Original question CurrentAnswers %d, new question CurrentAnswers %d, SuppressUnusable %d, SuppressQuery %d",
- qptr, CRDisplayString(m,rr), q->CurrentAnswers, qptr->CurrentAnswers, qptr->SuppressUnusable, qptr->SuppressQuery);
-
- rr->CRActiveQuestion = qptr; // Question used to be active; new value may or may not be null
- if (!qptr) m->rrcache_active--; // If no longer active, decrement rrcache_active count
- }
- AnswerCurrentQuestionWithResourceRecord(m, rr, QC_rmv);
- if (m->CurrentQuestion != q) break; // If callback deleted q, then we're finished here
- }
- }
- }
-
-mDNSlocal mDNSBool IsQuestionNew(mDNS *const m, DNSQuestion *question)
- {
- DNSQuestion *q;
- for (q = m->NewQuestions; q; q = q->next)
- if (q == question) return mDNStrue;
- return mDNSfalse;
- }
-
-mDNSlocal mDNSBool LocalRecordRmvEventsForQuestion(mDNS *const m, DNSQuestion *q)
- {
- AuthRecord *rr;
- mDNSu32 slot;
- AuthGroup *ag;
-
- if (m->CurrentQuestion)
- LogMsg("LocalRecordRmvEventsForQuestion: ERROR m->CurrentQuestion already set: %##s (%s)",
- m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype));
-
- if (IsQuestionNew(m, q))
- {
- LogInfo("LocalRecordRmvEventsForQuestion: New Question %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- return mDNStrue;
- }
- m->CurrentQuestion = q;
- slot = AuthHashSlot(&q->qname);
- ag = AuthGroupForName(&m->rrauth, slot, q->qnamehash, &q->qname);
- if (ag)
- {
- for (rr = ag->members; rr; rr=rr->next)
- // Filter the /etc/hosts records - LocalOnly, Unique, A/AAAA/CNAME
- if (LORecordAnswersAddressType(rr) && LocalOnlyRecordAnswersQuestion(rr, q))
- {
- LogInfo("LocalRecordRmvEventsForQuestion: Delivering possible Rmv events with record %s",
- ARDisplayString(m, rr));
- if (q->CurrentAnswers <= 0 || q->LOAddressAnswers <= 0)
- {
- LogMsg("LocalRecordRmvEventsForQuestion: ERROR!! CurrentAnswers or LOAddressAnswers is zero %p %##s"
- " (%s) CurrentAnswers %d, LOAddressAnswers %d", q, q->qname.c, DNSTypeName(q->qtype),
- q->CurrentAnswers, q->LOAddressAnswers);
- continue;
- }
- AnswerLocalQuestionWithLocalAuthRecord(m, rr, QC_rmv); // MUST NOT dereference q again
- if (m->CurrentQuestion != q) { m->CurrentQuestion = mDNSNULL; return mDNSfalse; }
- }
- }
- m->CurrentQuestion = mDNSNULL;
- return mDNStrue;
- }
-
-// Returns false if the question got deleted while delivering the RMV events
-// The caller should handle the case
-mDNSlocal mDNSBool CacheRecordRmvEventsForQuestion(mDNS *const m, DNSQuestion *q)
- {
- if (m->CurrentQuestion)
- LogMsg("CacheRecordRmvEventsForQuestion: ERROR m->CurrentQuestion already set: %##s (%s)",
- m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype));
-
- // If it is a new question, we have not delivered any ADD events yet. So, don't deliver RMV events.
- // If this question was answered using local auth records, then you can't deliver RMVs using cache
- if (!IsQuestionNew(m, q) && !q->LOAddressAnswers)
- {
- m->CurrentQuestion = q;
- CacheRecordRmvEventsForCurrentQuestion(m, q);
- if (m->CurrentQuestion != q) { m->CurrentQuestion = mDNSNULL; return mDNSfalse; }
- m->CurrentQuestion = mDNSNULL;
- }
- else { LogInfo("CacheRecordRmvEventsForQuestion: Question %p %##s (%s) is a new question", q, q->qname.c, DNSTypeName(q->qtype)); }
- return mDNStrue;
- }
-
-// The caller should hold the lock
-mDNSexport void CheckSuppressUnusableQuestions(mDNS *const m)
- {
- DNSQuestion *q;
- DNSQuestion *restart = mDNSNULL;
-
- // We look through all questions including new questions. During network change events,
- // we potentially restart questions here in this function that ends up as new questions,
- // which may be suppressed at this instance. Before it is handled we get another network
- // event that changes the status e.g., address becomes available. If we did not process
- // new questions, we would never change its SuppressQuery status.
- //
- // CurrentQuestion is used by RmvEventsForQuestion below. While delivering RMV events, the
- // application callback can potentially stop the current question (detected by CurrentQuestion) or
- // *any* other question which could be the next one that we may process here. RestartQuestion
- // points to the "next" question which will be automatically advanced in mDNS_StopQuery_internal
- // if the "next" question is stopped while the CurrentQuestion is stopped
- if (m->RestartQuestion)
- LogMsg("CheckSuppressUnusableQuestions: ERROR!! m->RestartQuestion already set: %##s (%s)",
- m->RestartQuestion->qname.c, DNSTypeName(m->RestartQuestion->qtype));
- m->RestartQuestion = m->Questions;
- while (m->RestartQuestion)
- {
- q = m->RestartQuestion;
- m->RestartQuestion = q->next;
- if (!mDNSOpaque16IsZero(q->TargetQID) && q->SuppressUnusable)
- {
- mDNSBool old = q->SuppressQuery;
- q->SuppressQuery = ShouldSuppressQuery(m, &q->qname, q->qtype, q->InterfaceID);
- if (q->SuppressQuery != old)
- {
- // NOTE: CacheRecordRmvEventsForQuestion will not generate RMV events for queries that have non-zero
- // LOddressAnswers. Hence it is important that we call CacheRecordRmvEventsForQuestion before
- // LocalRecordRmvEventsForQuestion (which decrements LOAddressAnswers)
-
- if (q->SuppressQuery)
- {
- // Previously it was not suppressed, Generate RMV events for the ADDs that we might have delivered before
- // followed by a negative cache response. Temporarily turn off suppression so that
- // AnswerCurrentQuestionWithResourceRecord can answer the question
- q->SuppressQuery = mDNSfalse;
- if (!CacheRecordRmvEventsForQuestion(m, q)) { LogInfo("CheckSuppressUnusableQuestions: Question deleted while delivering RMV events"); continue; }
- q->SuppressQuery = mDNStrue;
- }
-
- // SuppressUnusable does not affect questions that are answered from the local records (/etc/hosts)
- // and SuppressQuery status does not mean anything for these questions. As we are going to stop the
- // question below, we need to deliver the RMV events so that the ADDs that will be delivered during
- // the restart will not be a duplicate ADD
- if (!LocalRecordRmvEventsForQuestion(m, q)) { LogInfo("CheckSuppressUnusableQuestions: Question deleted while delivering RMV events"); continue; }
-
- // There are two cases here.
- //
- // 1. Previously it was suppressed and now it is not suppressed, restart the question so
- // that it will start as a new question. Note that we can't just call ActivateUnicastQuery
- // because when we get the response, if we had entries in the cache already, it will not answer
- // this question if the cache entry did not change. Hence, we need to restart
- // the query so that it can be answered from the cache.
- //
- // 2. Previously it was not suppressed and now it is suppressed. We need to restart the questions
- // so that we redo the duplicate checks in mDNS_StartQuery_internal. A SuppressUnusable question
- // is a duplicate of non-SuppressUnusable question if it is not suppressed (SuppressQuery is false).
- // A SuppressUnusable question is not a duplicate of non-SuppressUnusable question if it is suppressed
- // (SuppressQuery is true). The reason for this is that when a question is suppressed, we want an
- // immediate response and not want to be blocked behind a question that is querying DNS servers. When
- // the question is not suppressed, we don't want two active questions sending packets on the wire.
- // This affects both efficiency and also the current design where there is only one active question
- // pointed to from a cache entry.
- //
- // We restart queries in a two step process by first calling stop and build a temporary list which we
- // will restart at the end. The main reason for the two step process is to handle duplicate questions.
- // If there are duplicate questions, calling stop inherits the values from another question on the list (which
- // will soon become the real question) including q->ThisQInterval which might be zero if it was
- // suppressed before. At the end when we have restarted all questions, none of them is active as each
- // inherits from one another and we need to reactivate one of the questions here which is a little hacky.
- //
- // It is much cleaner and less error prone to build a list of questions and restart at the end.
-
- LogInfo("CheckSuppressUnusableQuestions: Stop question %p %##s (%s)", q, q->qname.c, DNSTypeName(q->qtype));
- mDNS_StopQuery_internal(m, q);
- q->next = restart;
- restart = q;
- }
- }
- }
- while (restart)
- {
- q = restart;
- restart = restart->next;
- q->next = mDNSNULL;
- LogInfo("CheckSuppressUnusableQuestions: Start question %p %##s (%s)", q, q->qname.c, DNSTypeName(q->qtype));
- mDNS_StartQuery_internal(m, q);
- }
- }
-
-mDNSexport mStatus mDNS_StartQuery_internal(mDNS *const m, DNSQuestion *const question)
- {
- if (question->Target.type && !ValidQuestionTarget(question))
- {
- LogMsg("mDNS_StartQuery_internal: Warning! Target.type = %ld port = %u (Client forgot to initialize before calling mDNS_StartQuery? for question %##s)",
- question->Target.type, mDNSVal16(question->TargetPort), question->qname.c);
- question->Target.type = mDNSAddrType_None;
- }
-
- if (!question->Target.type) question->TargetPort = zeroIPPort; // If no question->Target specified clear TargetPort
-
- question->TargetQID =
-#ifndef UNICAST_DISABLED
- (question->Target.type || Question_uDNS(question)) ? mDNS_NewMessageID(m) :
-#endif // UNICAST_DISABLED
- zeroID;
-
- debugf("mDNS_StartQuery: %##s (%s)", question->qname.c, DNSTypeName(question->qtype));
-
- if (m->rrcache_size == 0) // Can't do queries if we have no cache space allocated
- return(mStatus_NoCache);
- else
- {
- int i;
- DNSQuestion **q;
-
- if (!ValidateDomainName(&question->qname))
- {
- LogMsg("Attempt to start query with invalid qname %##s (%s)", question->qname.c, DNSTypeName(question->qtype));
- return(mStatus_Invalid);
- }
-
- // Note: It important that new questions are appended at the *end* of the list, not prepended at the start
- q = &m->Questions;
- if (question->InterfaceID == mDNSInterface_LocalOnly || question->InterfaceID == mDNSInterface_P2P) q = &m->LocalOnlyQuestions;
- while (*q && *q != question) q=&(*q)->next;
-
- if (*q)
- {
- LogMsg("Error! Tried to add a question %##s (%s) %p that's already in the active list",
- question->qname.c, DNSTypeName(question->qtype), question);
- return(mStatus_AlreadyRegistered);
- }
-
- *q = question;
-
- // If this question is referencing a specific interface, verify it exists
- if (question->InterfaceID && question->InterfaceID != mDNSInterface_LocalOnly && question->InterfaceID != mDNSInterface_Unicast && question->InterfaceID != mDNSInterface_P2P)
- {
- NetworkInterfaceInfo *intf = FirstInterfaceForID(m, question->InterfaceID);
- if (!intf)
- LogMsg("Note: InterfaceID %p for question %##s (%s) not currently found in active interface list",
- question->InterfaceID, question->qname.c, DNSTypeName(question->qtype));
- }
-
- // Note: In the case where we already have the answer to this question in our cache, that may be all the client
- // wanted, and they may immediately cancel their question. In this case, sending an actual query on the wire would
- // be a waste. For that reason, we schedule our first query to go out in half a second (InitialQuestionInterval).
- // If AnswerNewQuestion() finds that we have *no* relevant answers currently in our cache, then it will accelerate
- // that to go out immediately.
- question->next = mDNSNULL;
- question->qnamehash = DomainNameHashValue(&question->qname); // MUST do this before FindDuplicateQuestion()
- question->DelayAnswering = CheckForSoonToExpireRecords(m, &question->qname, question->qnamehash, HashSlot(&question->qname));
- question->LastQTime = m->timenow;
- question->ThisQInterval = InitialQuestionInterval; // MUST be > zero for an active question
- question->ExpectUnicastResp = 0;
- question->LastAnswerPktNum = m->PktNum;
- question->RecentAnswerPkts = 0;
- question->CurrentAnswers = 0;
- question->LargeAnswers = 0;
- question->UniqueAnswers = 0;
- question->LOAddressAnswers = 0;
- question->FlappingInterface1 = mDNSNULL;
- question->FlappingInterface2 = mDNSNULL;
- // Must do AuthInfo and SuppressQuery before calling FindDuplicateQuestion()
- question->AuthInfo = GetAuthInfoForQuestion(m, question);
- if (question->SuppressUnusable)
- question->SuppressQuery = ShouldSuppressQuery(m, &question->qname, question->qtype, question->InterfaceID);
- else
- question->SuppressQuery = 0;
- question->DuplicateOf = FindDuplicateQuestion(m, question);
- question->NextInDQList = mDNSNULL;
- question->SendQNow = mDNSNULL;
- question->SendOnAll = mDNSfalse;
- question->RequestUnicast = 0;
- question->LastQTxTime = m->timenow;
- question->CNAMEReferrals = 0;
-
- // We'll create our question->LocalSocket on demand, if needed.
- // We won't need one for duplicate questions, or from questions answered immediately out of the cache.
- // We also don't need one for LLQs because (when we're using NAT) we want them all to share a single
- // NAT mapping for receiving inbound add/remove events.
- question->LocalSocket = mDNSNULL;
- question->deliverAddEvents = mDNSfalse;
- question->qDNSServer = mDNSNULL;
- question->unansweredQueries = 0;
- question->nta = mDNSNULL;
- question->servAddr = zeroAddr;
- question->servPort = zeroIPPort;
- question->tcp = mDNSNULL;
- question->NoAnswer = NoAnswer_Normal;
-
- question->state = LLQ_InitialRequest;
- question->ReqLease = 0;
- question->expire = 0;
- question->ntries = 0;
- question->id = zeroOpaque64;
- question->validDNSServers = zeroOpaque64;
- question->triedAllServersOnce = 0;
- question->noServerResponse = 0;
- question->StopTime = 0;
- if (question->WakeOnResolve)
- {
- question->WakeOnResolveCount = InitialWakeOnResolveCount;
- mDNS_PurgeBeforeResolve(m, question);
- }
- else
- question->WakeOnResolveCount = 0;
-
- if (question->DuplicateOf) question->AuthInfo = question->DuplicateOf->AuthInfo;
-
- for (i=0; i<DupSuppressInfoSize; i++)
- question->DupSuppress[i].InterfaceID = mDNSNULL;
-
- debugf("mDNS_StartQuery: Question %##s (%s) Interface %p Now %d Send in %d Answer in %d (%p) %s (%p)",
- question->qname.c, DNSTypeName(question->qtype), question->InterfaceID, m->timenow,
- NextQSendTime(question) - m->timenow,
- question->DelayAnswering ? question->DelayAnswering - m->timenow : 0,
- question, question->DuplicateOf ? "duplicate of" : "not duplicate", question->DuplicateOf);
-
- if (question->DelayAnswering)
- LogInfo("mDNS_StartQuery_internal: Delaying answering for %d ticks while cache stabilizes for %##s (%s)",
- question->DelayAnswering - m->timenow, question->qname.c, DNSTypeName(question->qtype));
-
- if (question->InterfaceID == mDNSInterface_LocalOnly || question->InterfaceID == mDNSInterface_P2P)
- {
- if (!m->NewLocalOnlyQuestions) m->NewLocalOnlyQuestions = question;
- }
- else
- {
- if (!m->NewQuestions) m->NewQuestions = question;
-
- // If the question's id is non-zero, then it's Wide Area
- // MUST NOT do this Wide Area setup until near the end of
- // mDNS_StartQuery_internal -- this code may itself issue queries (e.g. SOA,
- // NS, etc.) and if we haven't finished setting up our own question and setting
- // m->NewQuestions if necessary then we could end up recursively re-entering
- // this routine with the question list data structures in an inconsistent state.
- if (!mDNSOpaque16IsZero(question->TargetQID))
- {
- // Duplicate questions should have the same DNSServers so that when we find
- // a matching resource record, all of them get the answers. Calling GetServerForQuestion
- // for the duplicate question may get a different DNS server from the original question
- mDNSu32 timeout = SetValidDNSServers(m, question);
- // We set the timeout whenever mDNS_StartQuery_internal is called. This means if we have
- // a networking change/search domain change that calls this function again we keep
- // reinitializing the timeout value which means it may never timeout. If this becomes
- // a common case in the future, we can easily fix this by adding extra state that
- // indicates that we have already set the StopTime.
- if (question->TimeoutQuestion)
- question->StopTime = NonZeroTime(m->timenow + timeout * mDNSPlatformOneSecond);
- if (question->DuplicateOf)
- {
- question->validDNSServers = question->DuplicateOf->validDNSServers;
- question->qDNSServer = question->DuplicateOf->qDNSServer;
- LogInfo("mDNS_StartQuery_internal: Duplicate question %p (%p) %##s (%s), Timeout %d, DNS Server %#a:%d",
- question, question->DuplicateOf, question->qname.c, DNSTypeName(question->qtype), timeout,
- question->qDNSServer ? &question->qDNSServer->addr : mDNSNULL,
- mDNSVal16(question->qDNSServer ? question->qDNSServer->port : zeroIPPort));
- }
- else
- {
- question->qDNSServer = GetServerForQuestion(m, question);
- LogInfo("mDNS_StartQuery_internal: question %p %##s (%s) Timeout %d, DNS Server %#a:%d",
- question, question->qname.c, DNSTypeName(question->qtype), timeout,
- question->qDNSServer ? &question->qDNSServer->addr : mDNSNULL,
- mDNSVal16(question->qDNSServer ? question->qDNSServer->port : zeroIPPort));
- }
- ActivateUnicastQuery(m, question, mDNSfalse);
-
- // If long-lived query, and we don't have our NAT mapping active, start it now
- if (question->LongLived && !m->LLQNAT.clientContext)
- {
- m->LLQNAT.Protocol = NATOp_MapUDP;
- m->LLQNAT.IntPort = m->UnicastPort4;
- m->LLQNAT.RequestedPort = m->UnicastPort4;
- m->LLQNAT.clientCallback = LLQNATCallback;
- m->LLQNAT.clientContext = (void*)1; // Means LLQ NAT Traversal is active
- mDNS_StartNATOperation_internal(m, &m->LLQNAT);
- }
-
-#if APPLE_OSX_mDNSResponder
- if (question->LongLived)
- UpdateAutoTunnelDomainStatuses(m);
-#endif
-
- }
- else
- {
- if (question->TimeoutQuestion)
- question->StopTime = NonZeroTime(m->timenow + GetTimeoutForMcastQuestion(m, question) * mDNSPlatformOneSecond);
- }
- if (question->StopTime) SetNextQueryStopTime(m, question);
- SetNextQueryTime(m,question);
- }
-
- return(mStatus_NoError);
- }
- }
-
-// CancelGetZoneData is an internal routine (i.e. must be called with the lock already held)
-mDNSexport void CancelGetZoneData(mDNS *const m, ZoneData *nta)
- {
- debugf("CancelGetZoneData %##s (%s)", nta->question.qname.c, DNSTypeName(nta->question.qtype));
- // This function may be called anytime to free the zone information.The question may or may not have stopped.
- // If it was already stopped, mDNS_StopQuery_internal would have set q->ThisQInterval to -1 and should not
- // call it again
- if (nta->question.ThisQInterval != -1)
- {
- mDNS_StopQuery_internal(m, &nta->question);
- if (nta->question.ThisQInterval != -1)
- LogMsg("CancelGetZoneData: Question %##s (%s) ThisQInterval %d not -1", nta->question.qname.c, DNSTypeName(nta->question.qtype), nta->question.ThisQInterval);
- }
- mDNSPlatformMemFree(nta);
- }
-
-mDNSexport mStatus mDNS_StopQuery_internal(mDNS *const m, DNSQuestion *const question)
- {
- const mDNSu32 slot = HashSlot(&question->qname);
- CacheGroup *cg = CacheGroupForName(m, slot, question->qnamehash, &question->qname);
- CacheRecord *rr;
- DNSQuestion **qp = &m->Questions;
-
- //LogInfo("mDNS_StopQuery_internal %##s (%s)", question->qname.c, DNSTypeName(question->qtype));
-
- if (question->InterfaceID == mDNSInterface_LocalOnly || question->InterfaceID == mDNSInterface_P2P) qp = &m->LocalOnlyQuestions;
- while (*qp && *qp != question) qp=&(*qp)->next;
- if (*qp) *qp = (*qp)->next;
- else
- {
-#if !ForceAlerts
- if (question->ThisQInterval >= 0) // Only log error message if the query was supposed to be active
-#endif
- LogMsg("mDNS_StopQuery_internal: Question %##s (%s) not found in active list",
- question->qname.c, DNSTypeName(question->qtype));
-#if ForceAlerts
- *(long*)0 = 0;
-#endif
- return(mStatus_BadReferenceErr);
- }
-
- // Take care to cut question from list *before* calling UpdateQuestionDuplicates
- UpdateQuestionDuplicates(m, question);
- // But don't trash ThisQInterval until afterwards.
- question->ThisQInterval = -1;
-
- // If there are any cache records referencing this as their active question, then see if there is any
- // other question that is also referencing them, else their CRActiveQuestion needs to get set to NULL.
- for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next)
- {
- if (rr->CRActiveQuestion == question)
- {
- DNSQuestion *q;
- // Checking for ActiveQuestion filters questions that are suppressed also
- // as suppressed questions are not active
- for (q = m->Questions; q; q=q->next) // Scan our list of questions
- if (ActiveQuestion(q) && ResourceRecordAnswersQuestion(&rr->resrec, q))
- break;
- if (q)
- debugf("mDNS_StopQuery_internal: Updating CRActiveQuestion to %p for cache record %s, Original question CurrentAnswers %d, new question "
- "CurrentAnswers %d, SuppressQuery %d", q, CRDisplayString(m,rr), question->CurrentAnswers, q->CurrentAnswers, q->SuppressQuery);
- rr->CRActiveQuestion = q; // Question used to be active; new value may or may not be null
- if (!q) m->rrcache_active--; // If no longer active, decrement rrcache_active count
- }
- }
-
- // If we just deleted the question that CacheRecordAdd() or CacheRecordRmv() is about to look at,
- // bump its pointer forward one question.
- if (m->CurrentQuestion == question)
- {
- debugf("mDNS_StopQuery_internal: Just deleted the currently active question: %##s (%s)",
- question->qname.c, DNSTypeName(question->qtype));
- m->CurrentQuestion = question->next;
- }
-
- if (m->NewQuestions == question)
- {
- debugf("mDNS_StopQuery_internal: Just deleted a new question that wasn't even answered yet: %##s (%s)",
- question->qname.c, DNSTypeName(question->qtype));
- m->NewQuestions = question->next;
- }
-
- if (m->NewLocalOnlyQuestions == question) m->NewLocalOnlyQuestions = question->next;
-
- if (m->RestartQuestion == question)
- {
- LogMsg("mDNS_StopQuery_internal: Just deleted the current restart question: %##s (%s)",
- question->qname.c, DNSTypeName(question->qtype));
- m->RestartQuestion = question->next;
- }
-
- // Take care not to trash question->next until *after* we've updated m->CurrentQuestion and m->NewQuestions
- question->next = mDNSNULL;
-
- // LogMsg("mDNS_StopQuery_internal: Question %##s (%s) removed", question->qname.c, DNSTypeName(question->qtype));
-
- // And finally, cancel any associated GetZoneData operation that's still running.
- // Must not do this until last, because there's a good chance the GetZoneData question is the next in the list,
- // so if we delete it earlier in this routine, we could find that our "question->next" pointer above is already
- // invalid before we even use it. By making sure that we update m->CurrentQuestion and m->NewQuestions if necessary
- // *first*, then they're all ready to be updated a second time if necessary when we cancel our GetZoneData query.
- if (question->tcp) { DisposeTCPConn(question->tcp); question->tcp = mDNSNULL; }
- if (question->LocalSocket) { mDNSPlatformUDPClose(question->LocalSocket); question->LocalSocket = mDNSNULL; }
- if (!mDNSOpaque16IsZero(question->TargetQID) && question->LongLived)
- {
- // Scan our list to see if any more wide-area LLQs remain. If not, stop our NAT Traversal.
- DNSQuestion *q;
- for (q = m->Questions; q; q=q->next)
- if (!mDNSOpaque16IsZero(q->TargetQID) && q->LongLived) break;
- if (!q)
- {
- if (!m->LLQNAT.clientContext) // Should never happen, but just in case...
- LogMsg("mDNS_StopQuery ERROR LLQNAT.clientContext NULL");
- else
- {
- LogInfo("Stopping LLQNAT");
- mDNS_StopNATOperation_internal(m, &m->LLQNAT);
- m->LLQNAT.clientContext = mDNSNULL; // Means LLQ NAT Traversal not running
- }
- }
-
- // If necessary, tell server it can delete this LLQ state
- if (question->state == LLQ_Established)
- {
- question->ReqLease = 0;
- sendLLQRefresh(m, question);
- // If we need need to make a TCP connection to cancel the LLQ, that's going to take a little while.
- // We clear the tcp->question backpointer so that when the TCP connection completes, it doesn't
- // crash trying to access our cancelled question, but we don't cancel the TCP operation itself --
- // we let that run out its natural course and complete asynchronously.
- if (question->tcp)
- {
- question->tcp->question = mDNSNULL;
- question->tcp = mDNSNULL;
- }
- }
-#if APPLE_OSX_mDNSResponder
- UpdateAutoTunnelDomainStatuses(m);
-#endif
- }
- // wait until we send the refresh above which needs the nta
- if (question->nta) { CancelGetZoneData(m, question->nta); question->nta = mDNSNULL; }
-
- return(mStatus_NoError);
- }
-
-mDNSexport mStatus mDNS_StartQuery(mDNS *const m, DNSQuestion *const question)
- {
- mStatus status;
- mDNS_Lock(m);
- status = mDNS_StartQuery_internal(m, question);
- mDNS_Unlock(m);
- return(status);
- }
-
-mDNSexport mStatus mDNS_StopQuery(mDNS *const m, DNSQuestion *const question)
- {
- mStatus status;
- mDNS_Lock(m);
- status = mDNS_StopQuery_internal(m, question);
- mDNS_Unlock(m);
- return(status);
- }
-
-// Note that mDNS_StopQueryWithRemoves() does not currently implement the full generality of the other APIs
-// Specifically, question callbacks invoked as a result of this call cannot themselves make API calls.
-// We invoke the callback without using mDNS_DropLockBeforeCallback/mDNS_ReclaimLockAfterCallback
-// specifically to catch and report if the client callback does try to make API calls
-mDNSexport mStatus mDNS_StopQueryWithRemoves(mDNS *const m, DNSQuestion *const question)
- {
- mStatus status;
- DNSQuestion *qq;
- mDNS_Lock(m);
-
- // Check if question is new -- don't want to give remove events for a question we haven't even answered yet
- for (qq = m->NewQuestions; qq; qq=qq->next) if (qq == question) break;
-
- status = mDNS_StopQuery_internal(m, question);
- if (status == mStatus_NoError && !qq)
- {
- const CacheRecord *rr;
- const mDNSu32 slot = HashSlot(&question->qname);
- CacheGroup *const cg = CacheGroupForName(m, slot, question->qnamehash, &question->qname);
- LogInfo("Generating terminal removes for %##s (%s)", question->qname.c, DNSTypeName(question->qtype));
- for (rr = cg ? cg->members : mDNSNULL; rr; rr=rr->next)
- if (rr->resrec.RecordType != kDNSRecordTypePacketNegative && SameNameRecordAnswersQuestion(&rr->resrec, question))
- {
- // Don't use mDNS_DropLockBeforeCallback() here, since we don't allow API calls
- if (question->QuestionCallback)
- question->QuestionCallback(m, question, &rr->resrec, mDNSfalse);
- }
- }
- mDNS_Unlock(m);
- return(status);
- }
-
-mDNSexport mStatus mDNS_Reconfirm(mDNS *const m, CacheRecord *const cr)
- {
- mStatus status;
- mDNS_Lock(m);
- status = mDNS_Reconfirm_internal(m, cr, kDefaultReconfirmTimeForNoAnswer);
- if (status == mStatus_NoError) ReconfirmAntecedents(m, cr->resrec.name, cr->resrec.namehash, 0);
- mDNS_Unlock(m);
- return(status);
- }
-
-mDNSexport mStatus mDNS_ReconfirmByValue(mDNS *const m, ResourceRecord *const rr)
- {
- mStatus status = mStatus_BadReferenceErr;
- CacheRecord *cr;
- mDNS_Lock(m);
- cr = FindIdenticalRecordInCache(m, rr);
- debugf("mDNS_ReconfirmByValue: %p %s", cr, RRDisplayString(m, rr));
- if (cr) status = mDNS_Reconfirm_internal(m, cr, kDefaultReconfirmTimeForNoAnswer);
- if (status == mStatus_NoError) ReconfirmAntecedents(m, cr->resrec.name, cr->resrec.namehash, 0);
- mDNS_Unlock(m);
- return(status);
- }
-
-mDNSlocal mStatus mDNS_StartBrowse_internal(mDNS *const m, DNSQuestion *const question,
- const domainname *const srv, const domainname *const domain,
- const mDNSInterfaceID InterfaceID, mDNSBool ForceMCast, mDNSQuestionCallback *Callback, void *Context)
- {
- question->InterfaceID = InterfaceID;
- question->Target = zeroAddr;
- question->qtype = kDNSType_PTR;
- question->qclass = kDNSClass_IN;
- question->LongLived = mDNStrue;
- question->ExpectUnique = mDNSfalse;
- question->ForceMCast = ForceMCast;
- question->ReturnIntermed = mDNSfalse;
- question->SuppressUnusable = mDNSfalse;
- question->SearchListIndex = 0;
- question->AppendSearchDomains = 0;
- question->RetryWithSearchDomains = mDNSfalse;
- question->TimeoutQuestion = 0;
- question->WakeOnResolve = 0;
- question->qnameOrig = mDNSNULL;
- question->QuestionCallback = Callback;
- question->QuestionContext = Context;
- if (!ConstructServiceName(&question->qname, mDNSNULL, srv, domain)) return(mStatus_BadParamErr);
-
- return(mDNS_StartQuery_internal(m, question));
- }
-
-mDNSexport mStatus mDNS_StartBrowse(mDNS *const m, DNSQuestion *const question,
- const domainname *const srv, const domainname *const domain,
- const mDNSInterfaceID InterfaceID, mDNSBool ForceMCast, mDNSQuestionCallback *Callback, void *Context)
- {
- mStatus status;
- mDNS_Lock(m);
- status = mDNS_StartBrowse_internal(m, question, srv, domain, InterfaceID, ForceMCast, Callback, Context);
- mDNS_Unlock(m);
- return(status);
- }
-
-mDNSlocal mDNSBool MachineHasActiveIPv6(mDNS *const m)
- {
- NetworkInterfaceInfo *intf;
- for (intf = m->HostInterfaces; intf; intf = intf->next)
- if (intf->ip.type == mDNSAddrType_IPv6) return(mDNStrue);
- return(mDNSfalse);
- }
-
-mDNSlocal void FoundServiceInfoSRV(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord)
- {
- ServiceInfoQuery *query = (ServiceInfoQuery *)question->QuestionContext;
- mDNSBool PortChanged = !mDNSSameIPPort(query->info->port, answer->rdata->u.srv.port);
- if (!AddRecord) return;
- if (answer->rrtype != kDNSType_SRV) return;
-
- query->info->port = answer->rdata->u.srv.port;
-
- // If this is our first answer, then set the GotSRV flag and start the address query
- if (!query->GotSRV)
- {
- query->GotSRV = mDNStrue;
- query->qAv4.InterfaceID = answer->InterfaceID;
- AssignDomainName(&query->qAv4.qname, &answer->rdata->u.srv.target);
- query->qAv6.InterfaceID = answer->InterfaceID;
- AssignDomainName(&query->qAv6.qname, &answer->rdata->u.srv.target);
- mDNS_StartQuery(m, &query->qAv4);
- // Only do the AAAA query if this machine actually has IPv6 active
- if (MachineHasActiveIPv6(m)) mDNS_StartQuery(m, &query->qAv6);
- }
- // If this is not our first answer, only re-issue the address query if the target host name has changed
- else if ((query->qAv4.InterfaceID != query->qSRV.InterfaceID && query->qAv4.InterfaceID != answer->InterfaceID) ||
- !SameDomainName(&query->qAv4.qname, &answer->rdata->u.srv.target))
- {
- mDNS_StopQuery(m, &query->qAv4);
- if (query->qAv6.ThisQInterval >= 0) mDNS_StopQuery(m, &query->qAv6);
- if (SameDomainName(&query->qAv4.qname, &answer->rdata->u.srv.target) && !PortChanged)
- {
- // If we get here, it means:
- // 1. This is not our first SRV answer
- // 2. The interface ID is different, but the target host and port are the same
- // This implies that we're seeing the exact same SRV record on more than one interface, so we should
- // make our address queries at least as broad as the original SRV query so that we catch all the answers.
- query->qAv4.InterfaceID = query->qSRV.InterfaceID; // Will be mDNSInterface_Any, or a specific interface
- query->qAv6.InterfaceID = query->qSRV.InterfaceID;
- }
- else
- {
- query->qAv4.InterfaceID = answer->InterfaceID;
- AssignDomainName(&query->qAv4.qname, &answer->rdata->u.srv.target);
- query->qAv6.InterfaceID = answer->InterfaceID;
- AssignDomainName(&query->qAv6.qname, &answer->rdata->u.srv.target);
- }
- debugf("FoundServiceInfoSRV: Restarting address queries for %##s (%s)", query->qAv4.qname.c, DNSTypeName(query->qAv4.qtype));
- mDNS_StartQuery(m, &query->qAv4);
- // Only do the AAAA query if this machine actually has IPv6 active
- if (MachineHasActiveIPv6(m)) mDNS_StartQuery(m, &query->qAv6);
- }
- else if (query->ServiceInfoQueryCallback && query->GotADD && query->GotTXT && PortChanged)
- {
- if (++query->Answers >= 100)
- debugf("**** WARNING **** Have given %lu answers for %##s (SRV) %##s %u",
- query->Answers, query->qSRV.qname.c, answer->rdata->u.srv.target.c,
- mDNSVal16(answer->rdata->u.srv.port));
- query->ServiceInfoQueryCallback(m, query);
- }
- // CAUTION: MUST NOT do anything more with query after calling query->Callback(), because the client's
- // callback function is allowed to do anything, including deleting this query and freeing its memory.
- }
-
-mDNSlocal void FoundServiceInfoTXT(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord)
- {
- ServiceInfoQuery *query = (ServiceInfoQuery *)question->QuestionContext;
- if (!AddRecord) return;
- if (answer->rrtype != kDNSType_TXT) return;
- if (answer->rdlength > sizeof(query->info->TXTinfo)) return;
-
- query->GotTXT = mDNStrue;
- query->info->TXTlen = answer->rdlength;
- query->info->TXTinfo[0] = 0; // In case answer->rdlength is zero
- mDNSPlatformMemCopy(query->info->TXTinfo, answer->rdata->u.txt.c, answer->rdlength);
-
- verbosedebugf("FoundServiceInfoTXT: %##s GotADD=%d", query->info->name.c, query->GotADD);
-
- // CAUTION: MUST NOT do anything more with query after calling query->Callback(), because the client's
- // callback function is allowed to do anything, including deleting this query and freeing its memory.
- if (query->ServiceInfoQueryCallback && query->GotADD)
- {
- if (++query->Answers >= 100)
- debugf("**** WARNING **** have given %lu answers for %##s (TXT) %#s...",
- query->Answers, query->qSRV.qname.c, answer->rdata->u.txt.c);
- query->ServiceInfoQueryCallback(m, query);
- }
- }
-
-mDNSlocal void FoundServiceInfo(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord)
- {
- ServiceInfoQuery *query = (ServiceInfoQuery *)question->QuestionContext;
- //LogInfo("FoundServiceInfo %d %s", AddRecord, RRDisplayString(m, answer));
- if (!AddRecord) return;
-
- if (answer->rrtype == kDNSType_A)
- {
- query->info->ip.type = mDNSAddrType_IPv4;
- query->info->ip.ip.v4 = answer->rdata->u.ipv4;
- }
- else if (answer->rrtype == kDNSType_AAAA)
- {
- query->info->ip.type = mDNSAddrType_IPv6;
- query->info->ip.ip.v6 = answer->rdata->u.ipv6;
- }
- else
- {
- debugf("FoundServiceInfo: answer %##s type %d (%s) unexpected", answer->name->c, answer->rrtype, DNSTypeName(answer->rrtype));
- return;
- }
-
- query->GotADD = mDNStrue;
- query->info->InterfaceID = answer->InterfaceID;
-
- verbosedebugf("FoundServiceInfo v%ld: %##s GotTXT=%d", query->info->ip.type, query->info->name.c, query->GotTXT);
-
- // CAUTION: MUST NOT do anything more with query after calling query->Callback(), because the client's
- // callback function is allowed to do anything, including deleting this query and freeing its memory.
- if (query->ServiceInfoQueryCallback && query->GotTXT)
- {
- if (++query->Answers >= 100)
- debugf(answer->rrtype == kDNSType_A ?
- "**** WARNING **** have given %lu answers for %##s (A) %.4a" :
- "**** WARNING **** have given %lu answers for %##s (AAAA) %.16a",
- query->Answers, query->qSRV.qname.c, &answer->rdata->u.data);
- query->ServiceInfoQueryCallback(m, query);
- }
- }
-
-// On entry, the client must have set the name and InterfaceID fields of the ServiceInfo structure
-// If the query is not interface-specific, then InterfaceID may be zero
-// Each time the Callback is invoked, the remainder of the fields will have been filled in
-// In addition, InterfaceID will be updated to give the interface identifier corresponding to that response
-mDNSexport mStatus mDNS_StartResolveService(mDNS *const m,
- ServiceInfoQuery *query, ServiceInfo *info, mDNSServiceInfoQueryCallback *Callback, void *Context)
- {
- mStatus status;
- mDNS_Lock(m);
-
- query->qSRV.ThisQInterval = -1; // So that mDNS_StopResolveService() knows whether to cancel this question
- query->qSRV.InterfaceID = info->InterfaceID;
- query->qSRV.Target = zeroAddr;
- AssignDomainName(&query->qSRV.qname, &info->name);
- query->qSRV.qtype = kDNSType_SRV;
- query->qSRV.qclass = kDNSClass_IN;
- query->qSRV.LongLived = mDNSfalse;
- query->qSRV.ExpectUnique = mDNStrue;
- query->qSRV.ForceMCast = mDNSfalse;
- query->qSRV.ReturnIntermed = mDNSfalse;
- query->qSRV.SuppressUnusable = mDNSfalse;
- query->qSRV.SearchListIndex = 0;
- query->qSRV.AppendSearchDomains = 0;
- query->qSRV.RetryWithSearchDomains = mDNSfalse;
- query->qSRV.TimeoutQuestion = 0;
- query->qSRV.WakeOnResolve = 0;
- query->qSRV.qnameOrig = mDNSNULL;
- query->qSRV.QuestionCallback = FoundServiceInfoSRV;
- query->qSRV.QuestionContext = query;
-
- query->qTXT.ThisQInterval = -1; // So that mDNS_StopResolveService() knows whether to cancel this question
- query->qTXT.InterfaceID = info->InterfaceID;
- query->qTXT.Target = zeroAddr;
- AssignDomainName(&query->qTXT.qname, &info->name);
- query->qTXT.qtype = kDNSType_TXT;
- query->qTXT.qclass = kDNSClass_IN;
- query->qTXT.LongLived = mDNSfalse;
- query->qTXT.ExpectUnique = mDNStrue;
- query->qTXT.ForceMCast = mDNSfalse;
- query->qTXT.ReturnIntermed = mDNSfalse;
- query->qTXT.SuppressUnusable = mDNSfalse;
- query->qTXT.SearchListIndex = 0;
- query->qTXT.AppendSearchDomains = 0;
- query->qTXT.RetryWithSearchDomains = mDNSfalse;
- query->qTXT.TimeoutQuestion = 0;
- query->qTXT.WakeOnResolve = 0;
- query->qTXT.qnameOrig = mDNSNULL;
- query->qTXT.QuestionCallback = FoundServiceInfoTXT;
- query->qTXT.QuestionContext = query;
-
- query->qAv4.ThisQInterval = -1; // So that mDNS_StopResolveService() knows whether to cancel this question
- query->qAv4.InterfaceID = info->InterfaceID;
- query->qAv4.Target = zeroAddr;
- query->qAv4.qname.c[0] = 0;
- query->qAv4.qtype = kDNSType_A;
- query->qAv4.qclass = kDNSClass_IN;
- query->qAv4.LongLived = mDNSfalse;
- query->qAv4.ExpectUnique = mDNStrue;
- query->qAv4.ForceMCast = mDNSfalse;
- query->qAv4.ReturnIntermed = mDNSfalse;
- query->qAv4.SuppressUnusable = mDNSfalse;
- query->qAv4.SearchListIndex = 0;
- query->qAv4.AppendSearchDomains = 0;
- query->qAv4.RetryWithSearchDomains = mDNSfalse;
- query->qAv4.TimeoutQuestion = 0;
- query->qAv4.WakeOnResolve = 0;
- query->qAv4.qnameOrig = mDNSNULL;
- query->qAv4.QuestionCallback = FoundServiceInfo;
- query->qAv4.QuestionContext = query;
-
- query->qAv6.ThisQInterval = -1; // So that mDNS_StopResolveService() knows whether to cancel this question
- query->qAv6.InterfaceID = info->InterfaceID;
- query->qAv6.Target = zeroAddr;
- query->qAv6.qname.c[0] = 0;
- query->qAv6.qtype = kDNSType_AAAA;
- query->qAv6.qclass = kDNSClass_IN;
- query->qAv6.LongLived = mDNSfalse;
- query->qAv6.ExpectUnique = mDNStrue;
- query->qAv6.ForceMCast = mDNSfalse;
- query->qAv6.ReturnIntermed = mDNSfalse;
- query->qAv6.SuppressUnusable = mDNSfalse;
- query->qAv6.SearchListIndex = 0;
- query->qAv6.AppendSearchDomains = 0;
- query->qAv6.RetryWithSearchDomains = mDNSfalse;
- query->qAv6.TimeoutQuestion = 0;
- query->qAv6.WakeOnResolve = 0;
- query->qAv6.qnameOrig = mDNSNULL;
- query->qAv6.QuestionCallback = FoundServiceInfo;
- query->qAv6.QuestionContext = query;
-
- query->GotSRV = mDNSfalse;
- query->GotTXT = mDNSfalse;
- query->GotADD = mDNSfalse;
- query->Answers = 0;
-
- query->info = info;
- query->ServiceInfoQueryCallback = Callback;
- query->ServiceInfoQueryContext = Context;
-
-// info->name = Must already be set up by client
-// info->interface = Must already be set up by client
- info->ip = zeroAddr;
- info->port = zeroIPPort;
- info->TXTlen = 0;
-
- // We use mDNS_StartQuery_internal here because we're already holding the lock
- status = mDNS_StartQuery_internal(m, &query->qSRV);
- if (status == mStatus_NoError) status = mDNS_StartQuery_internal(m, &query->qTXT);
- if (status != mStatus_NoError) mDNS_StopResolveService(m, query);
-
- mDNS_Unlock(m);
- return(status);
- }
-
-mDNSexport void mDNS_StopResolveService (mDNS *const m, ServiceInfoQuery *q)
- {
- mDNS_Lock(m);
- // We use mDNS_StopQuery_internal here because we're already holding the lock
- if (q->qSRV.ThisQInterval >= 0) mDNS_StopQuery_internal(m, &q->qSRV);
- if (q->qTXT.ThisQInterval >= 0) mDNS_StopQuery_internal(m, &q->qTXT);
- if (q->qAv4.ThisQInterval >= 0) mDNS_StopQuery_internal(m, &q->qAv4);
- if (q->qAv6.ThisQInterval >= 0) mDNS_StopQuery_internal(m, &q->qAv6);
- mDNS_Unlock(m);
- }
-
-mDNSexport mStatus mDNS_GetDomains(mDNS *const m, DNSQuestion *const question, mDNS_DomainType DomainType, const domainname *dom,
- const mDNSInterfaceID InterfaceID, mDNSQuestionCallback *Callback, void *Context)
- {
- question->InterfaceID = InterfaceID;
- question->Target = zeroAddr;
- question->qtype = kDNSType_PTR;
- question->qclass = kDNSClass_IN;
- question->LongLived = mDNSfalse;
- question->ExpectUnique = mDNSfalse;
- question->ForceMCast = mDNSfalse;
- question->ReturnIntermed = mDNSfalse;
- question->SuppressUnusable = mDNSfalse;
- question->SearchListIndex = 0;
- question->AppendSearchDomains = 0;
- question->RetryWithSearchDomains = mDNSfalse;
- question->TimeoutQuestion = 0;
- question->WakeOnResolve = 0;
- question->qnameOrig = mDNSNULL;
- question->QuestionCallback = Callback;
- question->QuestionContext = Context;
- if (DomainType > mDNS_DomainTypeMax) return(mStatus_BadParamErr);
- if (!MakeDomainNameFromDNSNameString(&question->qname, mDNS_DomainTypeNames[DomainType])) return(mStatus_BadParamErr);
- if (!dom) dom = &localdomain;
- if (!AppendDomainName(&question->qname, dom)) return(mStatus_BadParamErr);
- return(mDNS_StartQuery(m, question));
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - Responder Functions
-#endif
-
-mDNSexport mStatus mDNS_Register(mDNS *const m, AuthRecord *const rr)
- {
- mStatus status;
- mDNS_Lock(m);
- status = mDNS_Register_internal(m, rr);
- mDNS_Unlock(m);
- return(status);
- }
-
-mDNSexport mStatus mDNS_Update(mDNS *const m, AuthRecord *const rr, mDNSu32 newttl,
- const mDNSu16 newrdlength, RData *const newrdata, mDNSRecordUpdateCallback *Callback)
- {
- if (!ValidateRData(rr->resrec.rrtype, newrdlength, newrdata))
- {
- LogMsg("Attempt to update record with invalid rdata: %s", GetRRDisplayString_rdb(&rr->resrec, &newrdata->u, m->MsgBuffer));
- return(mStatus_Invalid);
- }
-
- mDNS_Lock(m);
-
- // If TTL is unspecified, leave TTL unchanged
- if (newttl == 0) newttl = rr->resrec.rroriginalttl;
-
- // If we already have an update queued up which has not gone through yet, give the client a chance to free that memory
- if (rr->NewRData)
- {
- RData *n = rr->NewRData;
- rr->NewRData = mDNSNULL; // Clear the NewRData pointer ...
- if (rr->UpdateCallback)
- rr->UpdateCallback(m, rr, n, rr->newrdlength); // ...and let the client free this memory, if necessary
- }
-
- rr->NewRData = newrdata;
- rr->newrdlength = newrdlength;
- rr->UpdateCallback = Callback;
-
-#ifndef UNICAST_DISABLED
- if (rr->ARType != AuthRecordLocalOnly && rr->ARType != AuthRecordP2P && !IsLocalDomain(rr->resrec.name))
- {
- mStatus status = uDNS_UpdateRecord(m, rr);
- // The caller frees the memory on error, don't retain stale pointers
- if (status != mStatus_NoError) { rr->NewRData = mDNSNULL; rr->newrdlength = 0; }
- mDNS_Unlock(m);
- return(status);
- }
-#endif
-
- if (RRLocalOnly(rr) || (rr->resrec.rroriginalttl == newttl &&
- rr->resrec.rdlength == newrdlength && mDNSPlatformMemSame(rr->resrec.rdata->u.data, newrdata->u.data, newrdlength)))
- CompleteRDataUpdate(m, rr);
- else
- {
- rr->AnnounceCount = InitialAnnounceCount;
- InitializeLastAPTime(m, rr);
- while (rr->NextUpdateCredit && m->timenow - rr->NextUpdateCredit >= 0) GrantUpdateCredit(rr);
- if (!rr->UpdateBlocked && rr->UpdateCredits) rr->UpdateCredits--;
- if (!rr->NextUpdateCredit) rr->NextUpdateCredit = NonZeroTime(m->timenow + kUpdateCreditRefreshInterval);
- if (rr->AnnounceCount > rr->UpdateCredits + 1) rr->AnnounceCount = (mDNSu8)(rr->UpdateCredits + 1);
- if (rr->UpdateCredits <= 5)
- {
- mDNSu32 delay = 6 - rr->UpdateCredits; // Delay 1 second, then 2, then 3, etc. up to 6 seconds maximum
- if (!rr->UpdateBlocked) rr->UpdateBlocked = NonZeroTime(m->timenow + (mDNSs32)delay * mDNSPlatformOneSecond);
- rr->ThisAPInterval *= 4;
- rr->LastAPTime = rr->UpdateBlocked - rr->ThisAPInterval;
- LogMsg("Excessive update rate for %##s; delaying announcement by %ld second%s",
- rr->resrec.name->c, delay, delay > 1 ? "s" : "");
- }
- rr->resrec.rroriginalttl = newttl;
- }
-
- mDNS_Unlock(m);
- return(mStatus_NoError);
- }
-
-// Note: mDNS_Deregister calls mDNS_Deregister_internal which can call a user callback, which may change
-// the record list and/or question list.
-// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this.
-mDNSexport mStatus mDNS_Deregister(mDNS *const m, AuthRecord *const rr)
- {
- mStatus status;
- mDNS_Lock(m);
- status = mDNS_Deregister_internal(m, rr, mDNS_Dereg_normal);
- mDNS_Unlock(m);
- return(status);
- }
-
-// Circular reference: AdvertiseInterface references mDNS_HostNameCallback, which calls mDNS_SetFQDN, which call AdvertiseInterface
-mDNSlocal void mDNS_HostNameCallback(mDNS *const m, AuthRecord *const rr, mStatus result);
-
-mDNSlocal NetworkInterfaceInfo *FindFirstAdvertisedInterface(mDNS *const m)
- {
- NetworkInterfaceInfo *intf;
- for (intf = m->HostInterfaces; intf; intf = intf->next)
- if (intf->Advertise) break;
- return(intf);
- }
-
-mDNSlocal void AdvertiseInterface(mDNS *const m, NetworkInterfaceInfo *set)
- {
- char buffer[MAX_REVERSE_MAPPING_NAME];
- NetworkInterfaceInfo *primary = FindFirstAdvertisedInterface(m);
- if (!primary) primary = set; // If no existing advertised interface, this new NetworkInterfaceInfo becomes our new primary
-
- // Send dynamic update for non-linklocal IPv4 Addresses
- mDNS_SetupResourceRecord(&set->RR_A, mDNSNULL, set->InterfaceID, kDNSType_A, kHostNameTTL, kDNSRecordTypeUnique, AuthRecordAny, mDNS_HostNameCallback, set);
- mDNS_SetupResourceRecord(&set->RR_PTR, mDNSNULL, set->InterfaceID, kDNSType_PTR, kHostNameTTL, kDNSRecordTypeKnownUnique, AuthRecordAny, mDNSNULL, mDNSNULL);
- mDNS_SetupResourceRecord(&set->RR_HINFO, mDNSNULL, set->InterfaceID, kDNSType_HINFO, kHostNameTTL, kDNSRecordTypeUnique, AuthRecordAny, mDNSNULL, mDNSNULL);
-
-#if ANSWER_REMOTE_HOSTNAME_QUERIES
- set->RR_A .AllowRemoteQuery = mDNStrue;
- set->RR_PTR .AllowRemoteQuery = mDNStrue;
- set->RR_HINFO.AllowRemoteQuery = mDNStrue;
-#endif
- // 1. Set up Address record to map from host name ("foo.local.") to IP address
- // 2. Set up reverse-lookup PTR record to map from our address back to our host name
- AssignDomainName(&set->RR_A.namestorage, &m->MulticastHostname);
- if (set->ip.type == mDNSAddrType_IPv4)
- {
- set->RR_A.resrec.rrtype = kDNSType_A;
- set->RR_A.resrec.rdata->u.ipv4 = set->ip.ip.v4;
- // Note: This is reverse order compared to a normal dotted-decimal IP address, so we can't use our customary "%.4a" format code
- mDNS_snprintf(buffer, sizeof(buffer), "%d.%d.%d.%d.in-addr.arpa.",
- set->ip.ip.v4.b[3], set->ip.ip.v4.b[2], set->ip.ip.v4.b[1], set->ip.ip.v4.b[0]);
- }
- else if (set->ip.type == mDNSAddrType_IPv6)
- {
- int i;
- set->RR_A.resrec.rrtype = kDNSType_AAAA;
- set->RR_A.resrec.rdata->u.ipv6 = set->ip.ip.v6;
- for (i = 0; i < 16; i++)
- {
- static const char hexValues[] = "0123456789ABCDEF";
- buffer[i * 4 ] = hexValues[set->ip.ip.v6.b[15 - i] & 0x0F];
- buffer[i * 4 + 1] = '.';
- buffer[i * 4 + 2] = hexValues[set->ip.ip.v6.b[15 - i] >> 4];
- buffer[i * 4 + 3] = '.';
- }
- mDNS_snprintf(&buffer[64], sizeof(buffer)-64, "ip6.arpa.");
- }
-
- MakeDomainNameFromDNSNameString(&set->RR_PTR.namestorage, buffer);
- set->RR_PTR.AutoTarget = Target_AutoHost; // Tell mDNS that the target of this PTR is to be kept in sync with our host name
- set->RR_PTR.ForceMCast = mDNStrue; // This PTR points to our dot-local name, so don't ever try to write it into a uDNS server
-
- set->RR_A.RRSet = &primary->RR_A; // May refer to self
-
- mDNS_Register_internal(m, &set->RR_A);
- mDNS_Register_internal(m, &set->RR_PTR);
-
- if (!NO_HINFO && m->HIHardware.c[0] > 0 && m->HISoftware.c[0] > 0 && m->HIHardware.c[0] + m->HISoftware.c[0] <= 254)
- {
- mDNSu8 *p = set->RR_HINFO.resrec.rdata->u.data;
- AssignDomainName(&set->RR_HINFO.namestorage, &m->MulticastHostname);
- set->RR_HINFO.DependentOn = &set->RR_A;
- mDNSPlatformMemCopy(p, &m->HIHardware, 1 + (mDNSu32)m->HIHardware.c[0]);
- p += 1 + (int)p[0];
- mDNSPlatformMemCopy(p, &m->HISoftware, 1 + (mDNSu32)m->HISoftware.c[0]);
- mDNS_Register_internal(m, &set->RR_HINFO);
- }
- else
- {
- debugf("Not creating HINFO record: platform support layer provided no information");
- set->RR_HINFO.resrec.RecordType = kDNSRecordTypeUnregistered;
- }
- }
-
-mDNSlocal void DeadvertiseInterface(mDNS *const m, NetworkInterfaceInfo *set)
- {
- NetworkInterfaceInfo *intf;
-
- // If we still have address records referring to this one, update them
- NetworkInterfaceInfo *primary = FindFirstAdvertisedInterface(m);
- AuthRecord *A = primary ? &primary->RR_A : mDNSNULL;
- for (intf = m->HostInterfaces; intf; intf = intf->next)
- if (intf->RR_A.RRSet == &set->RR_A)
- intf->RR_A.RRSet = A;
-
- // Unregister these records.
- // When doing the mDNS_Exit processing, we first call DeadvertiseInterface for each interface, so by the time the platform
- // support layer gets to call mDNS_DeregisterInterface, the address and PTR records have already been deregistered for it.
- // Also, in the event of a name conflict, one or more of our records will have been forcibly deregistered.
- // To avoid unnecessary and misleading warning messages, we check the RecordType before calling mDNS_Deregister_internal().
- if (set->RR_A. resrec.RecordType) mDNS_Deregister_internal(m, &set->RR_A, mDNS_Dereg_normal);
- if (set->RR_PTR. resrec.RecordType) mDNS_Deregister_internal(m, &set->RR_PTR, mDNS_Dereg_normal);
- if (set->RR_HINFO.resrec.RecordType) mDNS_Deregister_internal(m, &set->RR_HINFO, mDNS_Dereg_normal);
- }
-
-mDNSexport void mDNS_SetFQDN(mDNS *const m)
- {
- domainname newmname;
- NetworkInterfaceInfo *intf;
- AuthRecord *rr;
- newmname.c[0] = 0;
-
- if (!AppendDomainLabel(&newmname, &m->hostlabel)) { LogMsg("ERROR: mDNS_SetFQDN: Cannot create MulticastHostname"); return; }
- if (!AppendLiteralLabelString(&newmname, "local")) { LogMsg("ERROR: mDNS_SetFQDN: Cannot create MulticastHostname"); return; }
-
- mDNS_Lock(m);
-
- if (SameDomainNameCS(&m->MulticastHostname, &newmname)) debugf("mDNS_SetFQDN - hostname unchanged");
- else
- {
- AssignDomainName(&m->MulticastHostname, &newmname);
-
- // 1. Stop advertising our address records on all interfaces
- for (intf = m->HostInterfaces; intf; intf = intf->next)
- if (intf->Advertise) DeadvertiseInterface(m, intf);
-
- // 2. Start advertising our address records using the new name
- for (intf = m->HostInterfaces; intf; intf = intf->next)
- if (intf->Advertise) AdvertiseInterface(m, intf);
- }
-
- // 3. Make sure that any AutoTarget SRV records (and the like) get updated
- for (rr = m->ResourceRecords; rr; rr=rr->next) if (rr->AutoTarget) SetTargetToHostName(m, rr);
- for (rr = m->DuplicateRecords; rr; rr=rr->next) if (rr->AutoTarget) SetTargetToHostName(m, rr);
-
- mDNS_Unlock(m);
- }
-
-mDNSlocal void mDNS_HostNameCallback(mDNS *const m, AuthRecord *const rr, mStatus result)
- {
- (void)rr; // Unused parameter
-
- #if MDNS_DEBUGMSGS
- {
- char *msg = "Unknown result";
- if (result == mStatus_NoError) msg = "Name registered";
- else if (result == mStatus_NameConflict) msg = "Name conflict";
- debugf("mDNS_HostNameCallback: %##s (%s) %s (%ld)", rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype), msg, result);
- }
- #endif
-
- if (result == mStatus_NoError)
- {
- // Notify the client that the host name is successfully registered
- if (m->MainCallback)
- m->MainCallback(m, mStatus_NoError);
- }
- else if (result == mStatus_NameConflict)
- {
- domainlabel oldlabel = m->hostlabel;
-
- // 1. First give the client callback a chance to pick a new name
- if (m->MainCallback)
- m->MainCallback(m, mStatus_NameConflict);
-
- // 2. If the client callback didn't do it, add (or increment) an index ourselves
- // This needs to be case-INSENSITIVE compare, because we need to know that the name has been changed so as to
- // remedy the conflict, and a name that differs only in capitalization will just suffer the exact same conflict again.
- if (SameDomainLabel(m->hostlabel.c, oldlabel.c))
- IncrementLabelSuffix(&m->hostlabel, mDNSfalse);
-
- // 3. Generate the FQDNs from the hostlabel,
- // and make sure all SRV records, etc., are updated to reference our new hostname
- mDNS_SetFQDN(m);
- LogMsg("Local Hostname %#s.local already in use; will try %#s.local instead", oldlabel.c, m->hostlabel.c);
- }
- else if (result == mStatus_MemFree)
- {
- // .local hostnames do not require goodbyes - we ignore the MemFree (which is sent directly by
- // mDNS_Deregister_internal), and allow the caller to deallocate immediately following mDNS_DeadvertiseInterface
- debugf("mDNS_HostNameCallback: MemFree (ignored)");
- }
- else
- LogMsg("mDNS_HostNameCallback: Unknown error %d for registration of record %s", result, rr->resrec.name->c);
- }
-
-mDNSlocal void UpdateInterfaceProtocols(mDNS *const m, NetworkInterfaceInfo *active)
- {
- NetworkInterfaceInfo *intf;
- active->IPv4Available = mDNSfalse;
- active->IPv6Available = mDNSfalse;
- for (intf = m->HostInterfaces; intf; intf = intf->next)
- if (intf->InterfaceID == active->InterfaceID)
- {
- if (intf->ip.type == mDNSAddrType_IPv4 && intf->McastTxRx) active->IPv4Available = mDNStrue;
- if (intf->ip.type == mDNSAddrType_IPv6 && intf->McastTxRx) active->IPv6Available = mDNStrue;
- }
- }
-
-mDNSlocal void RestartRecordGetZoneData(mDNS * const m)
- {
- AuthRecord *rr;
- LogInfo("RestartRecordGetZoneData: ResourceRecords");
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- if (AuthRecord_uDNS(rr) && rr->state != regState_NoTarget)
- {
- debugf("RestartRecordGetZoneData: StartGetZoneData for %##s", rr->resrec.name->c);
- // Zero out the updateid so that if we have a pending response from the server, it won't
- // be accepted as a valid response. If we accept the response, we might free the new "nta"
- if (rr->nta) { rr->updateid = zeroID; CancelGetZoneData(m, rr->nta); }
- rr->nta = StartGetZoneData(m, rr->resrec.name, ZoneServiceUpdate, RecordRegistrationGotZoneData, rr);
- }
- }
-
-mDNSlocal void InitializeNetWakeState(mDNS *const m, NetworkInterfaceInfo *set)
- {
- int i;
- set->NetWakeBrowse.ThisQInterval = -1;
- for (i=0; i<3; i++)
- {
- set->NetWakeResolve[i].ThisQInterval = -1;
- set->SPSAddr[i].type = mDNSAddrType_None;
- }
- set->NextSPSAttempt = -1;
- set->NextSPSAttemptTime = m->timenow;
- }
-
-mDNSexport void mDNS_ActivateNetWake_internal(mDNS *const m, NetworkInterfaceInfo *set)
- {
- NetworkInterfaceInfo *p = m->HostInterfaces;
- while (p && p != set) p=p->next;
- if (!p) { LogMsg("mDNS_ActivateNetWake_internal: NetworkInterfaceInfo %p not found in active list", set); return; }
-
- if (set->InterfaceActive)
- {
- LogSPS("ActivateNetWake for %s (%#a)", set->ifname, &set->ip);
- mDNS_StartBrowse_internal(m, &set->NetWakeBrowse, &SleepProxyServiceType, &localdomain, set->InterfaceID, mDNSfalse, m->SPSBrowseCallback, set);
- }
- }
-
-mDNSexport void mDNS_DeactivateNetWake_internal(mDNS *const m, NetworkInterfaceInfo *set)
- {
- NetworkInterfaceInfo *p = m->HostInterfaces;
- while (p && p != set) p=p->next;
- if (!p) { LogMsg("mDNS_DeactivateNetWake_internal: NetworkInterfaceInfo %p not found in active list", set); return; }
-
- if (set->NetWakeBrowse.ThisQInterval >= 0)
- {
- int i;
- LogSPS("DeactivateNetWake for %s (%#a)", set->ifname, &set->ip);
-
- // Stop our browse and resolve operations
- mDNS_StopQuery_internal(m, &set->NetWakeBrowse);
- for (i=0; i<3; i++) if (set->NetWakeResolve[i].ThisQInterval >= 0) mDNS_StopQuery_internal(m, &set->NetWakeResolve[i]);
-
- // Make special call to the browse callback to let it know it can to remove all records for this interface
- if (m->SPSBrowseCallback)
- {
- mDNS_DropLockBeforeCallback(); // Allow client to legally make mDNS API calls from the callback
- m->SPSBrowseCallback(m, &set->NetWakeBrowse, mDNSNULL, mDNSfalse);
- mDNS_ReclaimLockAfterCallback(); // Decrement mDNS_reentrancy to block mDNS API calls again
- }
-
- // Reset our variables back to initial state, so we're ready for when NetWake is turned back on
- // (includes resetting NetWakeBrowse.ThisQInterval back to -1)
- InitializeNetWakeState(m, set);
- }
- }
-
-mDNSexport mStatus mDNS_RegisterInterface(mDNS *const m, NetworkInterfaceInfo *set, mDNSBool flapping)
- {
- AuthRecord *rr;
- mDNSBool FirstOfType = mDNStrue;
- NetworkInterfaceInfo **p = &m->HostInterfaces;
-
- if (!set->InterfaceID)
- { LogMsg("mDNS_RegisterInterface: Error! Tried to register a NetworkInterfaceInfo %#a with zero InterfaceID", &set->ip); return(mStatus_Invalid); }
-
- if (!mDNSAddressIsValidNonZero(&set->mask))
- { LogMsg("mDNS_RegisterInterface: Error! Tried to register a NetworkInterfaceInfo %#a with invalid mask %#a", &set->ip, &set->mask); return(mStatus_Invalid); }
-
- mDNS_Lock(m);
-
- // Assume this interface will be active now, unless we find a duplicate already in the list
- set->InterfaceActive = mDNStrue;
- set->IPv4Available = (mDNSu8)(set->ip.type == mDNSAddrType_IPv4 && set->McastTxRx);
- set->IPv6Available = (mDNSu8)(set->ip.type == mDNSAddrType_IPv6 && set->McastTxRx);
-
- InitializeNetWakeState(m, set);
-
- // Scan list to see if this InterfaceID is already represented
- while (*p)
- {
- if (*p == set)
- {
- LogMsg("mDNS_RegisterInterface: Error! Tried to register a NetworkInterfaceInfo that's already in the list");
- mDNS_Unlock(m);
- return(mStatus_AlreadyRegistered);
- }
-
- if ((*p)->InterfaceID == set->InterfaceID)
- {
- // This InterfaceID already represented by a different interface in the list, so mark this instance inactive for now
- set->InterfaceActive = mDNSfalse;
- if (set->ip.type == (*p)->ip.type) FirstOfType = mDNSfalse;
- if (set->ip.type == mDNSAddrType_IPv4 && set->McastTxRx) (*p)->IPv4Available = mDNStrue;
- if (set->ip.type == mDNSAddrType_IPv6 && set->McastTxRx) (*p)->IPv6Available = mDNStrue;
- }
-
- p=&(*p)->next;
- }
-
- set->next = mDNSNULL;
- *p = set;
-
- if (set->Advertise)
- AdvertiseInterface(m, set);
-
- LogInfo("mDNS_RegisterInterface: InterfaceID %p %s (%#a) %s", set->InterfaceID, set->ifname, &set->ip,
- set->InterfaceActive ?
- "not represented in list; marking active and retriggering queries" :
- "already represented in list; marking inactive for now");
-
- if (set->NetWake) mDNS_ActivateNetWake_internal(m, set);
-
- // In early versions of OS X the IPv6 address remains on an interface even when the interface is turned off,
- // giving the false impression that there's an active representative of this interface when there really isn't.
- // Therefore, when registering an interface, we want to re-trigger our questions and re-probe our Resource Records,
- // even if we believe that we previously had an active representative of this interface.
- if (set->McastTxRx && (FirstOfType || set->InterfaceActive))
- {
- DNSQuestion *q;
- // Normally, after an interface comes up, we pause half a second before beginning probing.
- // This is to guard against cases where there's rapid interface changes, where we could be confused by
- // seeing packets we ourselves sent just moments ago (perhaps when this interface had a different address)
- // which are then echoed back after a short delay by some Ethernet switches and some 802.11 base stations.
- // We don't want to do a probe, and then see a stale echo of an announcement we ourselves sent,
- // and think it's a conflicting answer to our probe.
- // In the case of a flapping interface, we pause for five seconds, and reduce the announcement count to one packet.
- const mDNSs32 probedelay = flapping ? mDNSPlatformOneSecond * 5 : mDNSPlatformOneSecond / 2;
- const mDNSu8 numannounce = flapping ? (mDNSu8)1 : InitialAnnounceCount;
-
- // Use a small amount of randomness:
- // In the case of a network administrator turning on an Ethernet hub so that all the
- // connected machines establish link at exactly the same time, we don't want them all
- // to go and hit the network with identical queries at exactly the same moment.
- // We set a random delay of up to InitialQuestionInterval (1/3 second).
- // We must *never* set m->SuppressSending to more than that (or set it repeatedly in a way
- // that causes mDNSResponder to remain in a prolonged state of SuppressSending, because
- // suppressing packet sending for more than about 1/3 second can cause protocol correctness
- // to start to break down (e.g. we don't answer probes fast enough, and get name conflicts).
- // See <rdar://problem/4073853> mDNS: m->SuppressSending set too enthusiastically
- if (!m->SuppressSending) m->SuppressSending = m->timenow + (mDNSs32)mDNSRandom((mDNSu32)InitialQuestionInterval);
-
- if (flapping) LogMsg("mDNS_RegisterInterface: Frequent transitions for interface %s (%#a)", set->ifname, &set->ip);
-
- LogInfo("mDNS_RegisterInterface: %s (%#a) probedelay %d", set->ifname, &set->ip, probedelay);
- if (m->SuppressProbes == 0 ||
- m->SuppressProbes - NonZeroTime(m->timenow + probedelay) < 0)
- m->SuppressProbes = NonZeroTime(m->timenow + probedelay);
-
- // Include OWNER option in packets for 60 seconds after connecting to the network. Setting
- // it here also handles the wake up case as the network link comes UP after waking causing
- // us to reconnect to the network. If we do this as part of the wake up code, it is possible
- // that the network link comes UP after 60 seconds and we never set the OWNER option
- m->AnnounceOwner = NonZeroTime(m->timenow + 60 * mDNSPlatformOneSecond);
- LogInfo("mDNS_RegisterInterface: Setting AnnounceOwner");
-
- for (q = m->Questions; q; q=q->next) // Scan our list of questions
- if (mDNSOpaque16IsZero(q->TargetQID))
- if (!q->InterfaceID || q->InterfaceID == set->InterfaceID) // If non-specific Q, or Q on this specific interface,
- { // then reactivate this question
- // If flapping, delay between first and second queries is nine seconds instead of one second
- mDNSBool dodelay = flapping && (q->FlappingInterface1 == set->InterfaceID || q->FlappingInterface2 == set->InterfaceID);
- mDNSs32 initial = dodelay ? InitialQuestionInterval * QuestionIntervalStep2 : InitialQuestionInterval;
- mDNSs32 qdelay = dodelay ? mDNSPlatformOneSecond * 5 : 0;
- if (dodelay) LogInfo("No cache records expired for %##s (%s); okay to delay questions a little", q->qname.c, DNSTypeName(q->qtype));
-
- if (!q->ThisQInterval || q->ThisQInterval > initial)
- {
- q->ThisQInterval = initial;
- q->RequestUnicast = 2; // Set to 2 because is decremented once *before* we check it
- }
- q->LastQTime = m->timenow - q->ThisQInterval + qdelay;
- q->RecentAnswerPkts = 0;
- SetNextQueryTime(m,q);
- }
-
- // For all our non-specific authoritative resource records (and any dormant records specific to this interface)
- // we now need them to re-probe if necessary, and then re-announce.
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- if (!AuthRecord_uDNS(rr))
- if (!rr->resrec.InterfaceID || rr->resrec.InterfaceID == set->InterfaceID)
- {
- if (rr->resrec.RecordType == kDNSRecordTypeVerified && !rr->DependentOn) rr->resrec.RecordType = kDNSRecordTypeUnique;
- rr->ProbeCount = DefaultProbeCountForRecordType(rr->resrec.RecordType);
- if (rr->AnnounceCount < numannounce) rr->AnnounceCount = numannounce;
- rr->SendNSECNow = mDNSNULL;
- InitializeLastAPTime(m, rr);
- }
- }
-
- RestartRecordGetZoneData(m);
-
- CheckSuppressUnusableQuestions(m);
-
- mDNS_UpdateAllowSleep(m);
-
- mDNS_Unlock(m);
- return(mStatus_NoError);
- }
-
-// Note: mDNS_DeregisterInterface calls mDNS_Deregister_internal which can call a user callback, which may change
-// the record list and/or question list.
-// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this.
-mDNSexport void mDNS_DeregisterInterface(mDNS *const m, NetworkInterfaceInfo *set, mDNSBool flapping)
- {
- NetworkInterfaceInfo **p = &m->HostInterfaces;
- mDNSBool revalidate = mDNSfalse;
-
- mDNS_Lock(m);
-
- // Find this record in our list
- while (*p && *p != set) p=&(*p)->next;
- if (!*p) { debugf("mDNS_DeregisterInterface: NetworkInterfaceInfo not found in list"); mDNS_Unlock(m); return; }
-
- mDNS_DeactivateNetWake_internal(m, set);
-
- // Unlink this record from our list
- *p = (*p)->next;
- set->next = mDNSNULL;
-
- if (!set->InterfaceActive)
- {
- // If this interface not the active member of its set, update the v4/v6Available flags for the active member
- NetworkInterfaceInfo *intf;
- for (intf = m->HostInterfaces; intf; intf = intf->next)
- if (intf->InterfaceActive && intf->InterfaceID == set->InterfaceID)
- UpdateInterfaceProtocols(m, intf);
- }
- else
- {
- NetworkInterfaceInfo *intf = FirstInterfaceForID(m, set->InterfaceID);
- if (intf)
- {
- LogInfo("mDNS_DeregisterInterface: Another representative of InterfaceID %p %s (%#a) exists;"
- " making it active", set->InterfaceID, set->ifname, &set->ip);
- if (intf->InterfaceActive)
- LogMsg("mDNS_DeregisterInterface: ERROR intf->InterfaceActive already set for %s (%#a)", set->ifname, &set->ip);
- intf->InterfaceActive = mDNStrue;
- UpdateInterfaceProtocols(m, intf);
-
- if (intf->NetWake) mDNS_ActivateNetWake_internal(m, intf);
-
- // See if another representative *of the same type* exists. If not, we mave have gone from
- // dual-stack to v6-only (or v4-only) so we need to reconfirm which records are still valid.
- for (intf = m->HostInterfaces; intf; intf = intf->next)
- if (intf->InterfaceID == set->InterfaceID && intf->ip.type == set->ip.type)
- break;
- if (!intf) revalidate = mDNStrue;
- }
- else
- {
- mDNSu32 slot;
- CacheGroup *cg;
- CacheRecord *rr;
- DNSQuestion *q;
- DNSServer *s;
-
- LogInfo("mDNS_DeregisterInterface: Last representative of InterfaceID %p %s (%#a) deregistered;"
- " marking questions etc. dormant", set->InterfaceID, set->ifname, &set->ip);
-
- if (set->McastTxRx && flapping)
- LogMsg("DeregisterInterface: Frequent transitions for interface %s (%#a)", set->ifname, &set->ip);
-
- // 1. Deactivate any questions specific to this interface, and tag appropriate questions
- // so that mDNS_RegisterInterface() knows how swiftly it needs to reactivate them
- for (q = m->Questions; q; q=q->next)
- {
- if (q->InterfaceID == set->InterfaceID) q->ThisQInterval = 0;
- if (!q->InterfaceID || q->InterfaceID == set->InterfaceID)
- {
- q->FlappingInterface2 = q->FlappingInterface1;
- q->FlappingInterface1 = set->InterfaceID; // Keep history of the last two interfaces to go away
- }
- }
-
- // 2. Flush any cache records received on this interface
- revalidate = mDNSfalse; // Don't revalidate if we're flushing the records
- FORALL_CACHERECORDS(slot, cg, rr)
- if (rr->resrec.InterfaceID == set->InterfaceID)
- {
- // If this interface is deemed flapping,
- // postpone deleting the cache records in case the interface comes back again
- if (set->McastTxRx && flapping)
- {
- // For a flapping interface we want these record to go away after 30 seconds
- mDNS_Reconfirm_internal(m, rr, kDefaultReconfirmTimeForFlappingInterface);
- // We set UnansweredQueries = MaxUnansweredQueries so we don't waste time doing any queries for them --
- // if the interface does come back, any relevant questions will be reactivated anyway
- rr->UnansweredQueries = MaxUnansweredQueries;
- }
- else
- mDNS_PurgeCacheResourceRecord(m, rr);
- }
-
- // 3. Any DNS servers specific to this interface are now unusable
- for (s = m->DNSServers; s; s = s->next)
- if (s->interface == set->InterfaceID)
- {
- s->interface = mDNSInterface_Any;
- s->teststate = DNSServer_Disabled;
- }
- }
- }
-
- // If we were advertising on this interface, deregister those address and reverse-lookup records now
- if (set->Advertise) DeadvertiseInterface(m, set);
-
- // If we have any cache records received on this interface that went away, then re-verify them.
- // In some versions of OS X the IPv6 address remains on an interface even when the interface is turned off,
- // giving the false impression that there's an active representative of this interface when there really isn't.
- // Don't need to do this when shutting down, because *all* interfaces are about to go away
- if (revalidate && !m->ShutdownTime)
- {
- mDNSu32 slot;
- CacheGroup *cg;
- CacheRecord *rr;
- FORALL_CACHERECORDS(slot, cg, rr)
- if (rr->resrec.InterfaceID == set->InterfaceID)
- mDNS_Reconfirm_internal(m, rr, kDefaultReconfirmTimeForFlappingInterface);
- }
-
- CheckSuppressUnusableQuestions(m);
-
- mDNS_UpdateAllowSleep(m);
-
- mDNS_Unlock(m);
- }
-
-mDNSlocal void ServiceCallback(mDNS *const m, AuthRecord *const rr, mStatus result)
- {
- ServiceRecordSet *sr = (ServiceRecordSet *)rr->RecordContext;
- (void)m; // Unused parameter
-
- #if MDNS_DEBUGMSGS
- {
- char *msg = "Unknown result";
- if (result == mStatus_NoError) msg = "Name Registered";
- else if (result == mStatus_NameConflict) msg = "Name Conflict";
- else if (result == mStatus_MemFree) msg = "Memory Free";
- debugf("ServiceCallback: %##s (%s) %s (%d)", rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype), msg, result);
- }
- #endif
-
- // Only pass on the NoError acknowledgement for the SRV record (when it finishes probing)
- if (result == mStatus_NoError && rr != &sr->RR_SRV) return;
-
- // If we got a name conflict on either SRV or TXT, forcibly deregister this service, and record that we did that
- if (result == mStatus_NameConflict)
- {
- sr->Conflict = mDNStrue; // Record that this service set had a conflict
- mDNS_DeregisterService(m, sr); // Unlink the records from our list
- return;
- }
-
- if (result == mStatus_MemFree)
- {
- // If the SRV/TXT/PTR records, or the _services._dns-sd._udp record, or any of the subtype PTR records,
- // are still in the process of deregistering, don't pass on the NameConflict/MemFree message until
- // every record is finished cleaning up.
- mDNSu32 i;
- ExtraResourceRecord *e = sr->Extras;
-
- if (sr->RR_SRV.resrec.RecordType != kDNSRecordTypeUnregistered) return;
- if (sr->RR_TXT.resrec.RecordType != kDNSRecordTypeUnregistered) return;
- if (sr->RR_PTR.resrec.RecordType != kDNSRecordTypeUnregistered) return;
- if (sr->RR_ADV.resrec.RecordType != kDNSRecordTypeUnregistered) return;
- for (i=0; i<sr->NumSubTypes; i++) if (sr->SubTypes[i].resrec.RecordType != kDNSRecordTypeUnregistered) return;
-
- while (e)
- {
- if (e->r.resrec.RecordType != kDNSRecordTypeUnregistered) return;
- e = e->next;
- }
-
- // If this ServiceRecordSet was forcibly deregistered, and now its memory is ready for reuse,
- // then we can now report the NameConflict to the client
- if (sr->Conflict) result = mStatus_NameConflict;
-
- }
-
- LogInfo("ServiceCallback: All records %s for %##s", (result == mStatus_MemFree ? "Unregistered": "Registered"), sr->RR_PTR.resrec.name->c);
- // CAUTION: MUST NOT do anything more with sr after calling sr->Callback(), because the client's callback
- // function is allowed to do anything, including deregistering this service and freeing its memory.
- if (sr->ServiceCallback)
- sr->ServiceCallback(m, sr, result);
- }
-
-mDNSlocal void NSSCallback(mDNS *const m, AuthRecord *const rr, mStatus result)
- {
- ServiceRecordSet *sr = (ServiceRecordSet *)rr->RecordContext;
- if (sr->ServiceCallback)
- sr->ServiceCallback(m, sr, result);
- }
-
-// Note:
-// Name is first label of domain name (any dots in the name are actual dots, not label separators)
-// Type is service type (e.g. "_ipp._tcp.")
-// Domain is fully qualified domain name (i.e. ending with a null label)
-// We always register a TXT, even if it is empty (so that clients are not
-// left waiting forever looking for a nonexistent record.)
-// If the host parameter is mDNSNULL or the root domain (ASCII NUL),
-// then the default host name (m->MulticastHostname) is automatically used
-// If the optional target host parameter is set, then the storage it points to must remain valid for the lifetime of the service registration
-mDNSexport mStatus mDNS_RegisterService(mDNS *const m, ServiceRecordSet *sr,
- const domainlabel *const name, const domainname *const type, const domainname *const domain,
- const domainname *const host, mDNSIPPort port, const mDNSu8 txtinfo[], mDNSu16 txtlen,
- AuthRecord *SubTypes, mDNSu32 NumSubTypes,
- mDNSInterfaceID InterfaceID, mDNSServiceCallback Callback, void *Context, mDNSu32 flags)
- {
- mStatus err;
- mDNSu32 i;
- mDNSu32 hostTTL;
- AuthRecType artype;
- mDNSu8 recordType = (flags & regFlagKnownUnique) ? kDNSRecordTypeKnownUnique : kDNSRecordTypeUnique;
-
- sr->ServiceCallback = Callback;
- sr->ServiceContext = Context;
- sr->Conflict = mDNSfalse;
-
- sr->Extras = mDNSNULL;
- sr->NumSubTypes = NumSubTypes;
- sr->SubTypes = SubTypes;
-
- if (InterfaceID == mDNSInterface_LocalOnly)
- artype = AuthRecordLocalOnly;
- else if (InterfaceID == mDNSInterface_P2P)
- artype = AuthRecordP2P;
- else if ((InterfaceID == mDNSInterface_Any) && (flags & regFlagIncludeP2P))
- artype = AuthRecordAnyIncludeP2P;
- else
- artype = AuthRecordAny;
-
- // Initialize the AuthRecord objects to sane values
- // Need to initialize everything correctly *before* making the decision whether to do a RegisterNoSuchService and bail out
- mDNS_SetupResourceRecord(&sr->RR_ADV, mDNSNULL, InterfaceID, kDNSType_PTR, kStandardTTL, kDNSRecordTypeAdvisory, artype, ServiceCallback, sr);
- mDNS_SetupResourceRecord(&sr->RR_PTR, mDNSNULL, InterfaceID, kDNSType_PTR, kStandardTTL, kDNSRecordTypeShared, artype, ServiceCallback, sr);
-
- if (SameDomainName(type, (const domainname *) "\x4" "_ubd" "\x4" "_tcp"))
- hostTTL = kHostNameSmallTTL;
- else
- hostTTL = kHostNameTTL;
-
- mDNS_SetupResourceRecord(&sr->RR_SRV, mDNSNULL, InterfaceID, kDNSType_SRV, hostTTL, recordType, artype, ServiceCallback, sr);
- mDNS_SetupResourceRecord(&sr->RR_TXT, mDNSNULL, InterfaceID, kDNSType_TXT, kStandardTTL, kDNSRecordTypeUnique, artype, ServiceCallback, sr);
-
- // If port number is zero, that means the client is really trying to do a RegisterNoSuchService
- if (mDNSIPPortIsZero(port))
- return(mDNS_RegisterNoSuchService(m, &sr->RR_SRV, name, type, domain, mDNSNULL, InterfaceID, NSSCallback, sr, (flags & regFlagIncludeP2P)));
-
- // If the client is registering an oversized TXT record,
- // it is the client's responsibility to alloate a ServiceRecordSet structure that is large enough for it
- if (sr->RR_TXT.resrec.rdata->MaxRDLength < txtlen)
- sr->RR_TXT.resrec.rdata->MaxRDLength = txtlen;
-
- // Set up the record names
- // For now we only create an advisory record for the main type, not for subtypes
- // We need to gain some operational experience before we decide if there's a need to create them for subtypes too
- if (ConstructServiceName(&sr->RR_ADV.namestorage, (const domainlabel*)"\x09_services", (const domainname*)"\x07_dns-sd\x04_udp", domain) == mDNSNULL)
- return(mStatus_BadParamErr);
- if (ConstructServiceName(&sr->RR_PTR.namestorage, mDNSNULL, type, domain) == mDNSNULL) return(mStatus_BadParamErr);
- if (ConstructServiceName(&sr->RR_SRV.namestorage, name, type, domain) == mDNSNULL) return(mStatus_BadParamErr);
- AssignDomainName(&sr->RR_TXT.namestorage, sr->RR_SRV.resrec.name);
-
- // 1. Set up the ADV record rdata to advertise our service type
- AssignDomainName(&sr->RR_ADV.resrec.rdata->u.name, sr->RR_PTR.resrec.name);
-
- // 2. Set up the PTR record rdata to point to our service name
- // We set up two additionals, so when a client asks for this PTR we automatically send the SRV and the TXT too
- // Note: uDNS registration code assumes that Additional1 points to the SRV record
- AssignDomainName(&sr->RR_PTR.resrec.rdata->u.name, sr->RR_SRV.resrec.name);
- sr->RR_PTR.Additional1 = &sr->RR_SRV;
- sr->RR_PTR.Additional2 = &sr->RR_TXT;
-
- // 2a. Set up any subtype PTRs to point to our service name
- // If the client is using subtypes, it is the client's responsibility to have
- // already set the first label of the record name to the subtype being registered
- for (i=0; i<NumSubTypes; i++)
- {
- domainname st;
- AssignDomainName(&st, sr->SubTypes[i].resrec.name);
- st.c[1+st.c[0]] = 0; // Only want the first label, not the whole FQDN (particularly for mDNS_RenameAndReregisterService())
- AppendDomainName(&st, type);
- mDNS_SetupResourceRecord(&sr->SubTypes[i], mDNSNULL, InterfaceID, kDNSType_PTR, kStandardTTL, kDNSRecordTypeShared, artype, ServiceCallback, sr);
- if (ConstructServiceName(&sr->SubTypes[i].namestorage, mDNSNULL, &st, domain) == mDNSNULL) return(mStatus_BadParamErr);
- AssignDomainName(&sr->SubTypes[i].resrec.rdata->u.name, &sr->RR_SRV.namestorage);
- sr->SubTypes[i].Additional1 = &sr->RR_SRV;
- sr->SubTypes[i].Additional2 = &sr->RR_TXT;
- }
-
- // 3. Set up the SRV record rdata.
- sr->RR_SRV.resrec.rdata->u.srv.priority = 0;
- sr->RR_SRV.resrec.rdata->u.srv.weight = 0;
- sr->RR_SRV.resrec.rdata->u.srv.port = port;
-
- // Setting AutoTarget tells DNS that the target of this SRV is to be automatically kept in sync with our host name
- if (host && host->c[0]) AssignDomainName(&sr->RR_SRV.resrec.rdata->u.srv.target, host);
- else { sr->RR_SRV.AutoTarget = Target_AutoHost; sr->RR_SRV.resrec.rdata->u.srv.target.c[0] = '\0'; }
-
- // 4. Set up the TXT record rdata,
- // and set DependentOn because we're depending on the SRV record to find and resolve conflicts for us
- // Note: uDNS registration code assumes that DependentOn points to the SRV record
- if (txtinfo == mDNSNULL) sr->RR_TXT.resrec.rdlength = 0;
- else if (txtinfo != sr->RR_TXT.resrec.rdata->u.txt.c)
- {
- sr->RR_TXT.resrec.rdlength = txtlen;
- if (sr->RR_TXT.resrec.rdlength > sr->RR_TXT.resrec.rdata->MaxRDLength) return(mStatus_BadParamErr);
- mDNSPlatformMemCopy(sr->RR_TXT.resrec.rdata->u.txt.c, txtinfo, txtlen);
- }
- sr->RR_TXT.DependentOn = &sr->RR_SRV;
-
- mDNS_Lock(m);
- // It is important that we register SRV first. uDNS assumes that SRV is registered first so
- // that if the SRV cannot find a target, rest of the records that belong to this service
- // will not be activated.
- err = mDNS_Register_internal(m, &sr->RR_SRV);
- // If we can't register the SRV record due to errors, bail out. It has not been inserted in
- // any list and hence no need to deregister. We could probably do similar checks for other
- // records below and bail out. For now, this seems to be sufficient to address rdar://9304275
- if (err)
- {
- mDNS_Unlock(m);
- return err;
- }
- if (!err) err = mDNS_Register_internal(m, &sr->RR_TXT);
- // We register the RR_PTR last, because we want to be sure that in the event of a forced call to
- // mDNS_StartExit, the RR_PTR will be the last one to be forcibly deregistered, since that is what triggers
- // the mStatus_MemFree callback to ServiceCallback, which in turn passes on the mStatus_MemFree back to
- // the client callback, which is then at liberty to free the ServiceRecordSet memory at will. We need to
- // make sure we've deregistered all our records and done any other necessary cleanup before that happens.
- if (!err) err = mDNS_Register_internal(m, &sr->RR_ADV);
- for (i=0; i<NumSubTypes; i++) if (!err) err = mDNS_Register_internal(m, &sr->SubTypes[i]);
- if (!err) err = mDNS_Register_internal(m, &sr->RR_PTR);
-
- mDNS_Unlock(m);
-
- if (err) mDNS_DeregisterService(m, sr);
- return(err);
- }
-
-mDNSexport mStatus mDNS_AddRecordToService(mDNS *const m, ServiceRecordSet *sr,
- ExtraResourceRecord *extra, RData *rdata, mDNSu32 ttl, mDNSu32 includeP2P)
- {
- ExtraResourceRecord **e;
- mStatus status;
- AuthRecType artype;
- mDNSInterfaceID InterfaceID = sr->RR_PTR.resrec.InterfaceID;
-
- if (InterfaceID == mDNSInterface_LocalOnly)
- artype = AuthRecordLocalOnly;
- if (InterfaceID == mDNSInterface_P2P)
- artype = AuthRecordP2P;
- else if ((InterfaceID == mDNSInterface_Any) && includeP2P)
- artype = AuthRecordAnyIncludeP2P;
- else
- artype = AuthRecordAny;
-
- extra->next = mDNSNULL;
- mDNS_SetupResourceRecord(&extra->r, rdata, sr->RR_PTR.resrec.InterfaceID,
- extra->r.resrec.rrtype, ttl, kDNSRecordTypeUnique, artype, ServiceCallback, sr);
- AssignDomainName(&extra->r.namestorage, sr->RR_SRV.resrec.name);
-
- mDNS_Lock(m);
- e = &sr->Extras;
- while (*e) e = &(*e)->next;
-
- if (ttl == 0) ttl = kStandardTTL;
-
- extra->r.DependentOn = &sr->RR_SRV;
-
- debugf("mDNS_AddRecordToService adding record to %##s %s %d",
- extra->r.resrec.name->c, DNSTypeName(extra->r.resrec.rrtype), extra->r.resrec.rdlength);
-
- status = mDNS_Register_internal(m, &extra->r);
- if (status == mStatus_NoError) *e = extra;
-
- mDNS_Unlock(m);
- return(status);
- }
-
-mDNSexport mStatus mDNS_RemoveRecordFromService(mDNS *const m, ServiceRecordSet *sr, ExtraResourceRecord *extra,
- mDNSRecordCallback MemFreeCallback, void *Context)
- {
- ExtraResourceRecord **e;
- mStatus status;
-
- mDNS_Lock(m);
- e = &sr->Extras;
- while (*e && *e != extra) e = &(*e)->next;
- if (!*e)
- {
- debugf("mDNS_RemoveRecordFromService failed to remove record from %##s", extra->r.resrec.name->c);
- status = mStatus_BadReferenceErr;
- }
- else
- {
- debugf("mDNS_RemoveRecordFromService removing record from %##s", extra->r.resrec.name->c);
- extra->r.RecordCallback = MemFreeCallback;
- extra->r.RecordContext = Context;
- *e = (*e)->next;
- status = mDNS_Deregister_internal(m, &extra->r, mDNS_Dereg_normal);
- }
- mDNS_Unlock(m);
- return(status);
- }
-
-mDNSexport mStatus mDNS_RenameAndReregisterService(mDNS *const m, ServiceRecordSet *const sr, const domainlabel *newname)
- {
- // Note: Don't need to use mDNS_Lock(m) here, because this code is just using public routines
- // mDNS_RegisterService() and mDNS_AddRecordToService(), which do the right locking internally.
- domainlabel name1, name2;
- domainname type, domain;
- const domainname *host = sr->RR_SRV.AutoTarget ? mDNSNULL : &sr->RR_SRV.resrec.rdata->u.srv.target;
- ExtraResourceRecord *extras = sr->Extras;
- mStatus err;
-
- DeconstructServiceName(sr->RR_SRV.resrec.name, &name1, &type, &domain);
- if (!newname)
- {
- name2 = name1;
- IncrementLabelSuffix(&name2, mDNStrue);
- newname = &name2;
- }
-
- if (SameDomainName(&domain, &localdomain))
- debugf("%##s service renamed from \"%#s\" to \"%#s\"", type.c, name1.c, newname->c);
- else debugf("%##s service (domain %##s) renamed from \"%#s\" to \"%#s\"",type.c, domain.c, name1.c, newname->c);
-
- err = mDNS_RegisterService(m, sr, newname, &type, &domain,
- host, sr->RR_SRV.resrec.rdata->u.srv.port, sr->RR_TXT.resrec.rdata->u.txt.c, sr->RR_TXT.resrec.rdlength,
- sr->SubTypes, sr->NumSubTypes,
- sr->RR_PTR.resrec.InterfaceID, sr->ServiceCallback, sr->ServiceContext, 0);
-
- // mDNS_RegisterService() just reset sr->Extras to NULL.
- // Fortunately we already grabbed ourselves a copy of this pointer (above), so we can now run
- // through the old list of extra records, and re-add them to our freshly created service registration
- while (!err && extras)
- {
- ExtraResourceRecord *e = extras;
- extras = extras->next;
- err = mDNS_AddRecordToService(m, sr, e, e->r.resrec.rdata, e->r.resrec.rroriginalttl, 0);
- }
-
- return(err);
- }
-
-// Note: mDNS_DeregisterService calls mDNS_Deregister_internal which can call a user callback,
-// which may change the record list and/or question list.
-// Any code walking either list must use the CurrentQuestion and/or CurrentRecord mechanism to protect against this.
-mDNSexport mStatus mDNS_DeregisterService_drt(mDNS *const m, ServiceRecordSet *sr, mDNS_Dereg_type drt)
- {
- // If port number is zero, that means this was actually registered using mDNS_RegisterNoSuchService()
- if (mDNSIPPortIsZero(sr->RR_SRV.resrec.rdata->u.srv.port)) return(mDNS_DeregisterNoSuchService(m, &sr->RR_SRV));
-
- if (sr->RR_PTR.resrec.RecordType == kDNSRecordTypeUnregistered)
- {
- debugf("Service set for %##s already deregistered", sr->RR_SRV.resrec.name->c);
- return(mStatus_BadReferenceErr);
- }
- else if (sr->RR_PTR.resrec.RecordType == kDNSRecordTypeDeregistering)
- {
- LogInfo("Service set for %##s already in the process of deregistering", sr->RR_SRV.resrec.name->c);
- // Avoid race condition:
- // If a service gets a conflict, then we set the Conflict flag to tell us to generate
- // an mStatus_NameConflict message when we get the mStatus_MemFree for our PTR record.
- // If the client happens to deregister the service in the middle of that process, then
- // we clear the flag back to the normal state, so that we deliver a plain mStatus_MemFree
- // instead of incorrectly promoting it to mStatus_NameConflict.
- // This race condition is exposed particularly when the conformance test generates
- // a whole batch of simultaneous conflicts across a range of services all advertised
- // using the same system default name, and if we don't take this precaution then
- // we end up incrementing m->nicelabel multiple times instead of just once.
- // <rdar://problem/4060169> Bug when auto-renaming Computer Name after name collision
- sr->Conflict = mDNSfalse;
- return(mStatus_NoError);
- }
- else
- {
- mDNSu32 i;
- mStatus status;
- ExtraResourceRecord *e;
- mDNS_Lock(m);
- e = sr->Extras;
-
- // We use mDNS_Dereg_repeat because, in the event of a collision, some or all of the
- // SRV, TXT, or Extra records could have already been automatically deregistered, and that's okay
- mDNS_Deregister_internal(m, &sr->RR_SRV, mDNS_Dereg_repeat);
- mDNS_Deregister_internal(m, &sr->RR_TXT, mDNS_Dereg_repeat);
-
- mDNS_Deregister_internal(m, &sr->RR_ADV, drt);
-
- // We deregister all of the extra records, but we leave the sr->Extras list intact
- // in case the client wants to do a RenameAndReregister and reinstate the registration
- while (e)
- {
- mDNS_Deregister_internal(m, &e->r, mDNS_Dereg_repeat);
- e = e->next;
- }
-
- for (i=0; i<sr->NumSubTypes; i++)
- mDNS_Deregister_internal(m, &sr->SubTypes[i], drt);
-
- status = mDNS_Deregister_internal(m, &sr->RR_PTR, drt);
- mDNS_Unlock(m);
- return(status);
- }
- }
-
-// Create a registration that asserts that no such service exists with this name.
-// This can be useful where there is a given function is available through several protocols.
-// For example, a printer called "Stuart's Printer" may implement printing via the "pdl-datastream" and "IPP"
-// protocols, but not via "LPR". In this case it would be prudent for the printer to assert the non-existence of an
-// "LPR" service called "Stuart's Printer". Without this precaution, another printer than offers only "LPR" printing
-// could inadvertently advertise its service under the same name "Stuart's Printer", which might be confusing for users.
-mDNSexport mStatus mDNS_RegisterNoSuchService(mDNS *const m, AuthRecord *const rr,
- const domainlabel *const name, const domainname *const type, const domainname *const domain,
- const domainname *const host,
- const mDNSInterfaceID InterfaceID, mDNSRecordCallback Callback, void *Context, mDNSBool includeP2P)
- {
- AuthRecType artype;
-
- if (InterfaceID == mDNSInterface_LocalOnly)
- artype = AuthRecordLocalOnly;
- else if (InterfaceID == mDNSInterface_P2P)
- artype = AuthRecordP2P;
- else if ((InterfaceID == mDNSInterface_Any) && includeP2P)
- artype = AuthRecordAnyIncludeP2P;
- else
- artype = AuthRecordAny;
-
- mDNS_SetupResourceRecord(rr, mDNSNULL, InterfaceID, kDNSType_SRV, kHostNameTTL, kDNSRecordTypeUnique, artype, Callback, Context);
- if (ConstructServiceName(&rr->namestorage, name, type, domain) == mDNSNULL) return(mStatus_BadParamErr);
- rr->resrec.rdata->u.srv.priority = 0;
- rr->resrec.rdata->u.srv.weight = 0;
- rr->resrec.rdata->u.srv.port = zeroIPPort;
- if (host && host->c[0]) AssignDomainName(&rr->resrec.rdata->u.srv.target, host);
- else rr->AutoTarget = Target_AutoHost;
- return(mDNS_Register(m, rr));
- }
-
-mDNSexport mStatus mDNS_AdvertiseDomains(mDNS *const m, AuthRecord *rr,
- mDNS_DomainType DomainType, const mDNSInterfaceID InterfaceID, char *domname)
- {
- AuthRecType artype;
-
- if (InterfaceID == mDNSInterface_LocalOnly)
- artype = AuthRecordLocalOnly;
- else if (InterfaceID == mDNSInterface_P2P)
- artype = AuthRecordP2P;
- else
- artype = AuthRecordAny;
- mDNS_SetupResourceRecord(rr, mDNSNULL, InterfaceID, kDNSType_PTR, kStandardTTL, kDNSRecordTypeShared, artype, mDNSNULL, mDNSNULL);
- if (!MakeDomainNameFromDNSNameString(&rr->namestorage, mDNS_DomainTypeNames[DomainType])) return(mStatus_BadParamErr);
- if (!MakeDomainNameFromDNSNameString(&rr->resrec.rdata->u.name, domname)) return(mStatus_BadParamErr);
- return(mDNS_Register(m, rr));
- }
-
-mDNSlocal mDNSBool mDNS_IdUsedInResourceRecordsList(mDNS * const m, mDNSOpaque16 id)
- {
- AuthRecord *r;
- for (r = m->ResourceRecords; r; r=r->next) if (mDNSSameOpaque16(id, r->updateid)) return mDNStrue;
- return mDNSfalse;
- }
-
-mDNSlocal mDNSBool mDNS_IdUsedInQuestionsList(mDNS * const m, mDNSOpaque16 id)
- {
- DNSQuestion *q;
- for (q = m->Questions; q; q=q->next) if (mDNSSameOpaque16(id, q->TargetQID)) return mDNStrue;
- return mDNSfalse;
- }
-
-mDNSexport mDNSOpaque16 mDNS_NewMessageID(mDNS * const m)
- {
- mDNSOpaque16 id;
- int i;
-
- for (i=0; i<10; i++)
- {
- id = mDNSOpaque16fromIntVal(1 + (mDNSu16)mDNSRandom(0xFFFE));
- if (!mDNS_IdUsedInResourceRecordsList(m, id) && !mDNS_IdUsedInQuestionsList(m, id)) break;
- }
-
- debugf("mDNS_NewMessageID: %5d", mDNSVal16(id));
-
- return id;
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - Sleep Proxy Server
-#endif
-
-mDNSlocal void RestartARPProbing(mDNS *const m, AuthRecord *const rr)
- {
- // If we see an ARP from a machine we think is sleeping, then either
- // (i) the machine has woken, or
- // (ii) it's just a stray old packet from before the machine slept
- // To handle the second case, we reset ProbeCount, so we'll suppress our own answers for a while, to avoid
- // generating ARP conflicts with a waking machine, and set rr->LastAPTime so we'll start probing again in 10 seconds.
- // If the machine has just woken then we'll discard our records when we see the first new mDNS probe from that machine.
- // If it was a stray old packet, then after 10 seconds we'll probe again and then start answering ARPs again. In this case we *do*
- // need to send new ARP Announcements, because the owner's ARP broadcasts will have updated neighboring ARP caches, so we need to
- // re-assert our (temporary) ownership of that IP address in order to receive subsequent packets addressed to that IPv4 address.
-
- rr->resrec.RecordType = kDNSRecordTypeUnique;
- rr->ProbeCount = DefaultProbeCountForTypeUnique;
-
- // If we haven't started announcing yet (and we're not already in ten-second-delay mode) the machine is probably
- // still going to sleep, so we just reset rr->ProbeCount so we'll continue probing until it stops responding.
- // If we *have* started announcing, the machine is probably in the process of waking back up, so in that case
- // we're more cautious and we wait ten seconds before probing it again. We do this because while waking from
- // sleep, some network interfaces tend to lose or delay inbound packets, and without this delay, if the waking machine
- // didn't answer our three probes within three seconds then we'd announce and cause it an unnecessary address conflict.
- if (rr->AnnounceCount == InitialAnnounceCount && m->timenow - rr->LastAPTime >= 0)
- InitializeLastAPTime(m, rr);
- else
- {
- rr->AnnounceCount = InitialAnnounceCount;
- rr->ThisAPInterval = mDNSPlatformOneSecond;
- rr->LastAPTime = m->timenow + mDNSPlatformOneSecond * 9; // Send first packet at rr->LastAPTime + rr->ThisAPInterval, i.e. 10 seconds from now
- SetNextAnnounceProbeTime(m, rr);
- }
- }
-
-mDNSlocal void mDNSCoreReceiveRawARP(mDNS *const m, const ARP_EthIP *const arp, const mDNSInterfaceID InterfaceID)
- {
- static const mDNSOpaque16 ARP_op_request = { { 0, 1 } };
- AuthRecord *rr;
- NetworkInterfaceInfo *intf = FirstInterfaceForID(m, InterfaceID);
- if (!intf) return;
-
- mDNS_Lock(m);
-
- // Pass 1:
- // Process ARP Requests and Probes (but not Announcements), and generate an ARP Reply if necessary.
- // We also process ARPs from our own kernel (and 'answer' them by injecting a local ARP table entry)
- // We ignore ARP Announcements here -- Announcements are not questions, they're assertions, so we don't need to answer them.
- // The times we might need to react to an ARP Announcement are:
- // (i) as an indication that the host in question has not gone to sleep yet (so we should delay beginning to proxy for it) or
- // (ii) if it's a conflicting Announcement from another host
- // -- and we check for these in Pass 2 below.
- if (mDNSSameOpaque16(arp->op, ARP_op_request) && !mDNSSameIPv4Address(arp->spa, arp->tpa))
- {
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- if (rr->resrec.InterfaceID == InterfaceID && rr->resrec.RecordType != kDNSRecordTypeDeregistering &&
- rr->AddressProxy.type == mDNSAddrType_IPv4 && mDNSSameIPv4Address(rr->AddressProxy.ip.v4, arp->tpa))
- {
- static const char msg1[] = "ARP Req from owner -- re-probing";
- static const char msg2[] = "Ignoring ARP Request from ";
- static const char msg3[] = "Creating Local ARP Cache entry ";
- static const char msg4[] = "Answering ARP Request from ";
- const char *const msg = mDNSSameEthAddress(&arp->sha, &rr->WakeUp.IMAC) ? msg1 :
- (rr->AnnounceCount == InitialAnnounceCount) ? msg2 :
- mDNSSameEthAddress(&arp->sha, &intf->MAC) ? msg3 : msg4;
- LogSPS("%-7s %s %.6a %.4a for %.4a -- H-MAC %.6a I-MAC %.6a %s",
- intf->ifname, msg, &arp->sha, &arp->spa, &arp->tpa, &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, ARDisplayString(m, rr));
- if (msg == msg1) RestartARPProbing(m, rr);
- else if (msg == msg3) mDNSPlatformSetLocalAddressCacheEntry(m, &rr->AddressProxy, &rr->WakeUp.IMAC, InterfaceID);
- else if (msg == msg4) SendARP(m, 2, rr, &arp->tpa, &arp->sha, &arp->spa, &arp->sha);
- }
- }
-
- // Pass 2:
- // For all types of ARP packet we check the Sender IP address to make sure it doesn't conflict with any AddressProxy record we're holding.
- // (Strictly speaking we're only checking Announcement/Request/Reply packets, since ARP Probes have zero Sender IP address,
- // so by definition (and by design) they can never conflict with any real (i.e. non-zero) IP address).
- // We ignore ARPs we sent ourselves (Sender MAC address is our MAC address) because our own proxy ARPs do not constitute a conflict that we need to handle.
- // If we see an apparently conflicting ARP, we check the sender hardware address:
- // If the sender hardware address is the original owner this is benign, so we just suppress our own proxy answering for a while longer.
- // If the sender hardware address is *not* the original owner, then this is a conflict, and we need to wake the sleeping machine to handle it.
- if (mDNSSameEthAddress(&arp->sha, &intf->MAC))
- debugf("ARP from self for %.4a", &arp->tpa);
- else
- {
- if (!mDNSSameIPv4Address(arp->spa, zerov4Addr))
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- if (rr->resrec.InterfaceID == InterfaceID && rr->resrec.RecordType != kDNSRecordTypeDeregistering &&
- rr->AddressProxy.type == mDNSAddrType_IPv4 && mDNSSameIPv4Address(rr->AddressProxy.ip.v4, arp->spa))
- {
- RestartARPProbing(m, rr);
- if (mDNSSameEthAddress(&arp->sha, &rr->WakeUp.IMAC))
- LogSPS("%-7s ARP %s from owner %.6a %.4a for %-15.4a -- re-starting probing for %s", intf->ifname,
- mDNSSameIPv4Address(arp->spa, arp->tpa) ? "Announcement " : mDNSSameOpaque16(arp->op, ARP_op_request) ? "Request " : "Response ",
- &arp->sha, &arp->spa, &arp->tpa, ARDisplayString(m, rr));
- else
- {
- LogMsg("%-7s Conflicting ARP from %.6a %.4a for %.4a -- waking H-MAC %.6a I-MAC %.6a %s", intf->ifname,
- &arp->sha, &arp->spa, &arp->tpa, &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, ARDisplayString(m, rr));
- ScheduleWakeup(m, rr->resrec.InterfaceID, &rr->WakeUp.HMAC);
- }
- }
- }
-
- mDNS_Unlock(m);
- }
-
-/*
-// Option 1 is Source Link Layer Address Option
-// Option 2 is Target Link Layer Address Option
-mDNSlocal const mDNSEthAddr *GetLinkLayerAddressOption(const IPv6NDP *const ndp, const mDNSu8 *const end, mDNSu8 op)
- {
- const mDNSu8 *options = (mDNSu8 *)(ndp+1);
- while (options < end)
- {
- debugf("NDP Option %02X len %2d %d", options[0], options[1], end - options);
- if (options[0] == op && options[1] == 1) return (const mDNSEthAddr*)(options+2);
- options += options[1] * 8;
- }
- return mDNSNULL;
- }
-*/
-
-mDNSlocal void mDNSCoreReceiveRawND(mDNS *const m, const mDNSEthAddr *const sha, const mDNSv6Addr *spa,
- const IPv6NDP *const ndp, const mDNSu8 *const end, const mDNSInterfaceID InterfaceID)
- {
- AuthRecord *rr;
- NetworkInterfaceInfo *intf = FirstInterfaceForID(m, InterfaceID);
- if (!intf) return;
-
- mDNS_Lock(m);
-
- // Pass 1: Process Neighbor Solicitations, and generate a Neighbor Advertisement if necessary.
- if (ndp->type == NDP_Sol)
- {
- //const mDNSEthAddr *const sha = GetLinkLayerAddressOption(ndp, end, NDP_SrcLL);
- (void)end;
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- if (rr->resrec.InterfaceID == InterfaceID && rr->resrec.RecordType != kDNSRecordTypeDeregistering &&
- rr->AddressProxy.type == mDNSAddrType_IPv6 && mDNSSameIPv6Address(rr->AddressProxy.ip.v6, ndp->target))
- {
- static const char msg1[] = "NDP Req from owner -- re-probing";
- static const char msg2[] = "Ignoring NDP Request from ";
- static const char msg3[] = "Creating Local NDP Cache entry ";
- static const char msg4[] = "Answering NDP Request from ";
- static const char msg5[] = "Answering NDP Probe from ";
- const char *const msg = sha && mDNSSameEthAddress(sha, &rr->WakeUp.IMAC) ? msg1 :
- (rr->AnnounceCount == InitialAnnounceCount) ? msg2 :
- sha && mDNSSameEthAddress(sha, &intf->MAC) ? msg3 :
- spa && mDNSIPv6AddressIsZero(*spa) ? msg4 : msg5;
- LogSPS("%-7s %s %.6a %.16a for %.16a -- H-MAC %.6a I-MAC %.6a %s",
- intf->ifname, msg, sha, spa, &ndp->target, &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, ARDisplayString(m, rr));
- if (msg == msg1) RestartARPProbing(m, rr);
- else if (msg == msg3)
- {
- if (!(m->KnownBugs & mDNS_KnownBug_LimitedIPv6))
- mDNSPlatformSetLocalAddressCacheEntry(m, &rr->AddressProxy, &rr->WakeUp.IMAC, InterfaceID);
- }
- else if (msg == msg4) SendNDP(m, NDP_Adv, NDP_Solicited, rr, &ndp->target, mDNSNULL, spa, sha );
- else if (msg == msg5) SendNDP(m, NDP_Adv, 0, rr, &ndp->target, mDNSNULL, &AllHosts_v6, &AllHosts_v6_Eth);
- }
- }
-
- // Pass 2: For all types of NDP packet we check the Sender IP address to make sure it doesn't conflict with any AddressProxy record we're holding.
- if (mDNSSameEthAddress(sha, &intf->MAC))
- debugf("NDP from self for %.16a", &ndp->target);
- else
- {
- // For Neighbor Advertisements we check the Target address field, not the actual IPv6 source address.
- // When a machine has both link-local and routable IPv6 addresses, it may send NDP packets making assertions
- // about its routable IPv6 address, using its link-local address as the source address for all NDP packets.
- // Hence it is the NDP target address we care about, not the actual packet source address.
- if (ndp->type == NDP_Adv) spa = &ndp->target;
- if (!mDNSSameIPv6Address(*spa, zerov6Addr))
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- if (rr->resrec.InterfaceID == InterfaceID && rr->resrec.RecordType != kDNSRecordTypeDeregistering &&
- rr->AddressProxy.type == mDNSAddrType_IPv6 && mDNSSameIPv6Address(rr->AddressProxy.ip.v6, *spa))
- {
- RestartARPProbing(m, rr);
- if (mDNSSameEthAddress(sha, &rr->WakeUp.IMAC))
- LogSPS("%-7s NDP %s from owner %.6a %.16a for %.16a -- re-starting probing for %s", intf->ifname,
- ndp->type == NDP_Sol ? "Solicitation " : "Advertisement", sha, spa, &ndp->target, ARDisplayString(m, rr));
- else
- {
- LogMsg("%-7s Conflicting NDP from %.6a %.16a for %.16a -- waking H-MAC %.6a I-MAC %.6a %s", intf->ifname,
- sha, spa, &ndp->target, &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, ARDisplayString(m, rr));
- ScheduleWakeup(m, rr->resrec.InterfaceID, &rr->WakeUp.HMAC);
- }
- }
- }
-
- mDNS_Unlock(m);
- }
-
-mDNSlocal void mDNSCoreReceiveRawTransportPacket(mDNS *const m, const mDNSEthAddr *const sha, const mDNSAddr *const src, const mDNSAddr *const dst, const mDNSu8 protocol,
- const mDNSu8 *const p, const TransportLayerPacket *const t, const mDNSu8 *const end, const mDNSInterfaceID InterfaceID, const mDNSu16 len)
- {
- const mDNSIPPort port = (protocol == 0x06) ? t->tcp.dst : (protocol == 0x11) ? t->udp.dst : zeroIPPort;
- mDNSBool wake = mDNSfalse;
-
- switch (protocol)
- {
- #define XX wake ? "Received" : "Ignoring", end-p
- case 0x01: LogSPS("Ignoring %d-byte ICMP from %#a to %#a", end-p, src, dst);
- break;
-
- case 0x06: {
- #define SSH_AsNumber 22
- static const mDNSIPPort SSH = { { SSH_AsNumber >> 8, SSH_AsNumber & 0xFF } };
-
- // Plan to wake if
- // (a) RST is not set, AND
- // (b) packet is SYN, SYN+FIN, or plain data packet (no SYN or FIN). We won't wake for FIN alone.
- wake = (!(t->tcp.flags & 4) && (t->tcp.flags & 3) != 1);
-
- // For now, to reduce spurious wakeups, we wake only for TCP SYN,
- // except for ssh connections, where we'll wake for plain data packets too
- if (!mDNSSameIPPort(port, SSH) && !(t->tcp.flags & 2)) wake = mDNSfalse;
-
- LogSPS("%s %d-byte TCP from %#a:%d to %#a:%d%s%s%s", XX,
- src, mDNSVal16(t->tcp.src), dst, mDNSVal16(port),
- (t->tcp.flags & 2) ? " SYN" : "",
- (t->tcp.flags & 1) ? " FIN" : "",
- (t->tcp.flags & 4) ? " RST" : "");
- }
- break;
-
- case 0x11: {
- #define ARD_AsNumber 3283
- static const mDNSIPPort ARD = { { ARD_AsNumber >> 8, ARD_AsNumber & 0xFF } };
- const mDNSu16 udplen = (mDNSu16)((mDNSu16)t->bytes[4] << 8 | t->bytes[5]); // Length *including* 8-byte UDP header
- if (udplen >= sizeof(UDPHeader))
- {
- const mDNSu16 datalen = udplen - sizeof(UDPHeader);
- wake = mDNStrue;
-
- // For Back to My Mac UDP port 4500 (IPSEC) packets, we do some special handling
- if (mDNSSameIPPort(port, IPSECPort))
- {
- // Specifically ignore NAT keepalive packets
- if (datalen == 1 && end >= &t->bytes[9] && t->bytes[8] == 0xFF) wake = mDNSfalse;
- else
- {
- // Skip over the Non-ESP Marker if present
- const mDNSBool NonESP = (end >= &t->bytes[12] && t->bytes[8] == 0 && t->bytes[9] == 0 && t->bytes[10] == 0 && t->bytes[11] == 0);
- const IKEHeader *const ike = (IKEHeader *)(t + (NonESP ? 12 : 8));
- const mDNSu16 ikelen = datalen - (NonESP ? 4 : 0);
- if (ikelen >= sizeof(IKEHeader) && end >= ((mDNSu8 *)ike) + sizeof(IKEHeader))
- if ((ike->Version & 0x10) == 0x10)
- {
- // ExchangeType == 5 means 'Informational' <http://www.ietf.org/rfc/rfc2408.txt>
- // ExchangeType == 34 means 'IKE_SA_INIT' <http://www.iana.org/assignments/ikev2-parameters>
- if (ike->ExchangeType == 5 || ike->ExchangeType == 34) wake = mDNSfalse;
- LogSPS("%s %d-byte IKE ExchangeType %d", XX, ike->ExchangeType);
- }
- }
- }
-
- // For now, because we haven't yet worked out a clean elegant way to do this, we just special-case the
- // Apple Remote Desktop port number -- we ignore all packets to UDP 3283 (the "Net Assistant" port),
- // except for Apple Remote Desktop's explicit manual wakeup packet, which looks like this:
- // UDP header (8 bytes)
- // Payload: 13 88 00 6a 41 4e 41 20 (8 bytes) ffffffffffff (6 bytes) 16xMAC (96 bytes) = 110 bytes total
- if (mDNSSameIPPort(port, ARD)) wake = (datalen >= 110 && end >= &t->bytes[10] && t->bytes[8] == 0x13 && t->bytes[9] == 0x88);
-
- LogSPS("%s %d-byte UDP from %#a:%d to %#a:%d", XX, src, mDNSVal16(t->udp.src), dst, mDNSVal16(port));
- }
- }
- break;
-
- case 0x3A: if (&t->bytes[len] <= end)
- {
- mDNSu16 checksum = IPv6CheckSum(&src->ip.v6, &dst->ip.v6, protocol, t->bytes, len);
- if (!checksum) mDNSCoreReceiveRawND(m, sha, &src->ip.v6, &t->ndp, &t->bytes[len], InterfaceID);
- else LogInfo("IPv6CheckSum bad %04X %02X%02X from %#a to %#a", checksum, t->bytes[2], t->bytes[3], src, dst);
- }
- break;
-
- default: LogSPS("Ignoring %d-byte IP packet unknown protocol %d from %#a to %#a", end-p, protocol, src, dst);
- break;
- }
-
- if (wake)
- {
- AuthRecord *rr, *r2;
-
- mDNS_Lock(m);
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- if (rr->resrec.InterfaceID == InterfaceID &&
- rr->resrec.RecordType != kDNSRecordTypeDeregistering &&
- rr->AddressProxy.type && mDNSSameAddress(&rr->AddressProxy, dst))
- {
- const mDNSu8 *const tp = (protocol == 6) ? (const mDNSu8 *)"\x4_tcp" : (const mDNSu8 *)"\x4_udp";
- for (r2 = m->ResourceRecords; r2; r2=r2->next)
- if (r2->resrec.InterfaceID == InterfaceID && mDNSSameEthAddress(&r2->WakeUp.HMAC, &rr->WakeUp.HMAC) &&
- r2->resrec.RecordType != kDNSRecordTypeDeregistering &&
- r2->resrec.rrtype == kDNSType_SRV && mDNSSameIPPort(r2->resrec.rdata->u.srv.port, port) &&
- SameDomainLabel(ThirdLabel(r2->resrec.name)->c, tp))
- break;
- if (!r2 && mDNSSameIPPort(port, IPSECPort)) r2 = rr; // So that we wake for BTMM IPSEC packets, even without a matching SRV record
- if (r2)
- {
- LogMsg("Waking host at %s %#a H-MAC %.6a I-MAC %.6a for %s",
- InterfaceNameForID(m, rr->resrec.InterfaceID), dst, &rr->WakeUp.HMAC, &rr->WakeUp.IMAC, ARDisplayString(m, r2));
- ScheduleWakeup(m, rr->resrec.InterfaceID, &rr->WakeUp.HMAC);
- }
- else
- LogSPS("Sleeping host at %s %#a %.6a has no service on %#s %d",
- InterfaceNameForID(m, rr->resrec.InterfaceID), dst, &rr->WakeUp.HMAC, tp, mDNSVal16(port));
- }
- mDNS_Unlock(m);
- }
- }
-
-mDNSexport void mDNSCoreReceiveRawPacket(mDNS *const m, const mDNSu8 *const p, const mDNSu8 *const end, const mDNSInterfaceID InterfaceID)
- {
- static const mDNSOpaque16 Ethertype_ARP = { { 0x08, 0x06 } }; // Ethertype 0x0806 = ARP
- static const mDNSOpaque16 Ethertype_IPv4 = { { 0x08, 0x00 } }; // Ethertype 0x0800 = IPv4
- static const mDNSOpaque16 Ethertype_IPv6 = { { 0x86, 0xDD } }; // Ethertype 0x86DD = IPv6
- static const mDNSOpaque16 ARP_hrd_eth = { { 0x00, 0x01 } }; // Hardware address space (Ethernet = 1)
- static const mDNSOpaque16 ARP_pro_ip = { { 0x08, 0x00 } }; // Protocol address space (IP = 0x0800)
-
- // Note: BPF guarantees that the NETWORK LAYER header will be word aligned, not the link-layer header.
- // In other words, we can safely assume that pkt below (ARP, IPv4 or IPv6) is properly word aligned,
- // but if pkt is 4-byte aligned, that necessarily means that eth CANNOT also be 4-byte aligned
- // since it points to a an address 14 bytes before pkt.
- const EthernetHeader *const eth = (const EthernetHeader *)p;
- const NetworkLayerPacket *const pkt = (const NetworkLayerPacket *)(eth+1);
- mDNSAddr src, dst;
- #define RequiredCapLen(P) ((P)==0x01 ? 4 : (P)==0x06 ? 20 : (P)==0x11 ? 8 : (P)==0x3A ? 24 : 0)
-
- // Is ARP? Length must be at least 14 + 28 = 42 bytes
- if (end >= p+42 && mDNSSameOpaque16(eth->ethertype, Ethertype_ARP) && mDNSSameOpaque16(pkt->arp.hrd, ARP_hrd_eth) && mDNSSameOpaque16(pkt->arp.pro, ARP_pro_ip))
- mDNSCoreReceiveRawARP(m, &pkt->arp, InterfaceID);
- // Is IPv4 with zero fragmentation offset? Length must be at least 14 + 20 = 34 bytes
- else if (end >= p+34 && mDNSSameOpaque16(eth->ethertype, Ethertype_IPv4) && (pkt->v4.flagsfrags.b[0] & 0x1F) == 0 && pkt->v4.flagsfrags.b[1] == 0)
- {
- const mDNSu8 *const trans = p + 14 + (pkt->v4.vlen & 0xF) * 4;
- debugf("Got IPv4 %02X from %.4a to %.4a", pkt->v4.protocol, &pkt->v4.src, &pkt->v4.dst);
- src.type = mDNSAddrType_IPv4; src.ip.v4 = pkt->v4.src;
- dst.type = mDNSAddrType_IPv4; dst.ip.v4 = pkt->v4.dst;
- if (end >= trans + RequiredCapLen(pkt->v4.protocol))
- mDNSCoreReceiveRawTransportPacket(m, ð->src, &src, &dst, pkt->v4.protocol, p, (TransportLayerPacket*)trans, end, InterfaceID, 0);
- }
- // Is IPv6? Length must be at least 14 + 28 = 42 bytes
- else if (end >= p+54 && mDNSSameOpaque16(eth->ethertype, Ethertype_IPv6))
- {
- const mDNSu8 *const trans = p + 54;
- debugf("Got IPv6 %02X from %.16a to %.16a", pkt->v6.pro, &pkt->v6.src, &pkt->v6.dst);
- src.type = mDNSAddrType_IPv6; src.ip.v6 = pkt->v6.src;
- dst.type = mDNSAddrType_IPv6; dst.ip.v6 = pkt->v6.dst;
- if (end >= trans + RequiredCapLen(pkt->v6.pro))
- mDNSCoreReceiveRawTransportPacket(m, ð->src, &src, &dst, pkt->v6.pro, p, (TransportLayerPacket*)trans, end, InterfaceID,
- (mDNSu16)pkt->bytes[4] << 8 | pkt->bytes[5]);
- }
- }
-
-mDNSlocal void ConstructSleepProxyServerName(mDNS *const m, domainlabel *name)
- {
- name->c[0] = (mDNSu8)mDNS_snprintf((char*)name->c+1, 62, "%d-%d-%d-%d %#s",
- m->SPSType, m->SPSPortability, m->SPSMarginalPower, m->SPSTotalPower, &m->nicelabel);
- }
-
-mDNSlocal void SleepProxyServerCallback(mDNS *const m, ServiceRecordSet *const srs, mStatus result)
- {
- if (result == mStatus_NameConflict)
- mDNS_RenameAndReregisterService(m, srs, mDNSNULL);
- else if (result == mStatus_MemFree)
- {
- if (m->SleepState)
- m->SPSState = 3;
- else
- {
- m->SPSState = (mDNSu8)(m->SPSSocket != mDNSNULL);
- if (m->SPSState)
- {
- domainlabel name;
- ConstructSleepProxyServerName(m, &name);
- mDNS_RegisterService(m, srs,
- &name, &SleepProxyServiceType, &localdomain,
- mDNSNULL, m->SPSSocket->port, // Host, port
- (mDNSu8 *)"", 1, // TXT data, length
- mDNSNULL, 0, // Subtypes (none)
- mDNSInterface_Any, // Interface ID
- SleepProxyServerCallback, mDNSNULL, 0); // Callback, context, flags
- }
- LogSPS("Sleep Proxy Server %#s %s", srs->RR_SRV.resrec.name->c, m->SPSState ? "started" : "stopped");
- }
- }
- }
-
-// Called with lock held
-mDNSexport void mDNSCoreBeSleepProxyServer_internal(mDNS *const m, mDNSu8 sps, mDNSu8 port, mDNSu8 marginalpower, mDNSu8 totpower)
- {
- // This routine uses mDNS_DeregisterService and calls SleepProxyServerCallback, so we execute in user callback context
- mDNS_DropLockBeforeCallback();
-
- // If turning off SPS, close our socket
- // (Do this first, BEFORE calling mDNS_DeregisterService below)
- if (!sps && m->SPSSocket) { mDNSPlatformUDPClose(m->SPSSocket); m->SPSSocket = mDNSNULL; }
-
- // If turning off, or changing type, deregister old name
- if (m->SPSState == 1 && sps != m->SPSType)
- { m->SPSState = 2; mDNS_DeregisterService_drt(m, &m->SPSRecords, sps ? mDNS_Dereg_rapid : mDNS_Dereg_normal); }
-
- // Record our new SPS parameters
- m->SPSType = sps;
- m->SPSPortability = port;
- m->SPSMarginalPower = marginalpower;
- m->SPSTotalPower = totpower;
-
- // If turning on, open socket and advertise service
- if (sps)
- {
- if (!m->SPSSocket)
- {
- m->SPSSocket = mDNSPlatformUDPSocket(m, zeroIPPort);
- if (!m->SPSSocket) { LogMsg("mDNSCoreBeSleepProxyServer: Failed to allocate SPSSocket"); goto fail; }
- }
- if (m->SPSState == 0) SleepProxyServerCallback(m, &m->SPSRecords, mStatus_MemFree);
- }
- else if (m->SPSState)
- {
- LogSPS("mDNSCoreBeSleepProxyServer turning off from state %d; will wake clients", m->SPSState);
- m->NextScheduledSPS = m->timenow;
- }
-fail:
- mDNS_ReclaimLockAfterCallback();
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - Startup and Shutdown
-#endif
-
-mDNSlocal void mDNS_GrowCache_internal(mDNS *const m, CacheEntity *storage, mDNSu32 numrecords)
- {
- if (storage && numrecords)
- {
- mDNSu32 i;
- debugf("Adding cache storage for %d more records (%d bytes)", numrecords, numrecords*sizeof(CacheEntity));
- for (i=0; i<numrecords; i++) storage[i].next = &storage[i+1];
- storage[numrecords-1].next = m->rrcache_free;
- m->rrcache_free = storage;
- m->rrcache_size += numrecords;
- }
- }
-
-mDNSexport void mDNS_GrowCache(mDNS *const m, CacheEntity *storage, mDNSu32 numrecords)
- {
- mDNS_Lock(m);
- mDNS_GrowCache_internal(m, storage, numrecords);
- mDNS_Unlock(m);
- }
-
-mDNSexport mStatus mDNS_Init(mDNS *const m, mDNS_PlatformSupport *const p,
- CacheEntity *rrcachestorage, mDNSu32 rrcachesize,
- mDNSBool AdvertiseLocalAddresses, mDNSCallback *Callback, void *Context)
- {
- mDNSu32 slot;
- mDNSs32 timenow;
- mStatus result;
-
- if (!rrcachestorage) rrcachesize = 0;
-
- m->p = p;
- m->KnownBugs = 0;
- m->CanReceiveUnicastOn5353 = mDNSfalse; // Assume we can't receive unicasts on 5353, unless platform layer tells us otherwise
- m->AdvertiseLocalAddresses = AdvertiseLocalAddresses;
- m->DivertMulticastAdvertisements = mDNSfalse;
- m->mDNSPlatformStatus = mStatus_Waiting;
- m->UnicastPort4 = zeroIPPort;
- m->UnicastPort6 = zeroIPPort;
- m->PrimaryMAC = zeroEthAddr;
- m->MainCallback = Callback;
- m->MainContext = Context;
- m->rec.r.resrec.RecordType = 0;
-
- // For debugging: To catch and report locking failures
- m->mDNS_busy = 0;
- m->mDNS_reentrancy = 0;
- m->ShutdownTime = 0;
- m->lock_rrcache = 0;
- m->lock_Questions = 0;
- m->lock_Records = 0;
-
- // Task Scheduling variables
- result = mDNSPlatformTimeInit();
- if (result != mStatus_NoError) return(result);
- m->timenow_adjust = (mDNSs32)mDNSRandom(0xFFFFFFFF);
- timenow = mDNS_TimeNow_NoLock(m);
-
- m->timenow = 0; // MUST only be set within mDNS_Lock/mDNS_Unlock section
- m->timenow_last = timenow;
- m->NextScheduledEvent = timenow;
- m->SuppressSending = timenow;
- m->NextCacheCheck = timenow + 0x78000000;
- m->NextScheduledQuery = timenow + 0x78000000;
- m->NextScheduledProbe = timenow + 0x78000000;
- m->NextScheduledResponse = timenow + 0x78000000;
- m->NextScheduledNATOp = timenow + 0x78000000;
- m->NextScheduledSPS = timenow + 0x78000000;
- m->NextScheduledStopTime = timenow + 0x78000000;
- m->RandomQueryDelay = 0;
- m->RandomReconfirmDelay = 0;
- m->PktNum = 0;
- m->LocalRemoveEvents = mDNSfalse;
- m->SleepState = SleepState_Awake;
- m->SleepSeqNum = 0;
- m->SystemWakeOnLANEnabled = mDNSfalse;
- m->AnnounceOwner = NonZeroTime(timenow + 60 * mDNSPlatformOneSecond);
- m->DelaySleep = 0;
- m->SleepLimit = 0;
-
- // These fields only required for mDNS Searcher...
- m->Questions = mDNSNULL;
- m->NewQuestions = mDNSNULL;
- m->CurrentQuestion = mDNSNULL;
- m->LocalOnlyQuestions = mDNSNULL;
- m->NewLocalOnlyQuestions = mDNSNULL;
- m->RestartQuestion = mDNSNULL;
- m->rrcache_size = 0;
- m->rrcache_totalused = 0;
- m->rrcache_active = 0;
- m->rrcache_report = 10;
- m->rrcache_free = mDNSNULL;
-
- for (slot = 0; slot < CACHE_HASH_SLOTS; slot++)
- {
- m->rrcache_hash[slot] = mDNSNULL;
- m->rrcache_nextcheck[slot] = timenow + 0x78000000;;
- }
-
- mDNS_GrowCache_internal(m, rrcachestorage, rrcachesize);
- m->rrauth.rrauth_free = mDNSNULL;
-
- for (slot = 0; slot < AUTH_HASH_SLOTS; slot++)
- m->rrauth.rrauth_hash[slot] = mDNSNULL;
-
- // Fields below only required for mDNS Responder...
- m->hostlabel.c[0] = 0;
- m->nicelabel.c[0] = 0;
- m->MulticastHostname.c[0] = 0;
- m->HIHardware.c[0] = 0;
- m->HISoftware.c[0] = 0;
- m->ResourceRecords = mDNSNULL;
- m->DuplicateRecords = mDNSNULL;
- m->NewLocalRecords = mDNSNULL;
- m->NewLocalOnlyRecords = mDNSfalse;
- m->CurrentRecord = mDNSNULL;
- m->HostInterfaces = mDNSNULL;
- m->ProbeFailTime = 0;
- m->NumFailedProbes = 0;
- m->SuppressProbes = 0;
-
-#ifndef UNICAST_DISABLED
- m->NextuDNSEvent = timenow + 0x78000000;
- m->NextSRVUpdate = timenow + 0x78000000;
-
- m->DNSServers = mDNSNULL;
-
- m->Router = zeroAddr;
- m->AdvertisedV4 = zeroAddr;
- m->AdvertisedV6 = zeroAddr;
-
- m->AuthInfoList = mDNSNULL;
-
- m->ReverseMap.ThisQInterval = -1;
- m->StaticHostname.c[0] = 0;
- m->FQDN.c[0] = 0;
- m->Hostnames = mDNSNULL;
- m->AutoTunnelHostAddr.b[0] = 0;
- m->AutoTunnelHostAddrActive = mDNSfalse;
- m->AutoTunnelLabel.c[0] = 0;
-
- m->StartWABQueries = mDNSfalse;
- m->RegisterAutoTunnel6 = mDNStrue;
-
- // NAT traversal fields
- m->NATTraversals = mDNSNULL;
- m->CurrentNATTraversal = mDNSNULL;
- m->retryIntervalGetAddr = 0; // delta between time sent and retry
- m->retryGetAddr = timenow + 0x78000000; // absolute time when we retry
- m->ExternalAddress = zerov4Addr;
-
- m->NATMcastRecvskt = mDNSNULL;
- m->LastNATupseconds = 0;
- m->LastNATReplyLocalTime = timenow;
- m->LastNATMapResultCode = NATErr_None;
-
- m->UPnPInterfaceID = 0;
- m->SSDPSocket = mDNSNULL;
- m->SSDPWANPPPConnection = mDNSfalse;
- m->UPnPRouterPort = zeroIPPort;
- m->UPnPSOAPPort = zeroIPPort;
- m->UPnPRouterURL = mDNSNULL;
- m->UPnPWANPPPConnection = mDNSfalse;
- m->UPnPSOAPURL = mDNSNULL;
- m->UPnPRouterAddressString = mDNSNULL;
- m->UPnPSOAPAddressString = mDNSNULL;
- m->SPSType = 0;
- m->SPSPortability = 0;
- m->SPSMarginalPower = 0;
- m->SPSTotalPower = 0;
- m->SPSState = 0;
- m->SPSProxyListChanged = mDNSNULL;
- m->SPSSocket = mDNSNULL;
- m->SPSBrowseCallback = mDNSNULL;
- m->ProxyRecords = 0;
-
-#endif
-
-#if APPLE_OSX_mDNSResponder
- m->TunnelClients = mDNSNULL;
-
-#if ! NO_WCF
- CHECK_WCF_FUNCTION(WCFConnectionNew)
- {
- m->WCF = WCFConnectionNew();
- if (!m->WCF) { LogMsg("WCFConnectionNew failed"); return -1; }
- }
-#endif
-
-#endif
-
- result = mDNSPlatformInit(m);
-
-#ifndef UNICAST_DISABLED
- // It's better to do this *after* the platform layer has set up the
- // interface list and security credentials
- uDNS_SetupDNSConfig(m); // Get initial DNS configuration
-#endif
-
- return(result);
- }
-
-mDNSexport void mDNS_ConfigChanged(mDNS *const m)
- {
- if (m->SPSState == 1)
- {
- domainlabel name, newname;
- domainname type, domain;
- DeconstructServiceName(m->SPSRecords.RR_SRV.resrec.name, &name, &type, &domain);
- ConstructSleepProxyServerName(m, &newname);
- if (!SameDomainLabelCS(name.c, newname.c))
- {
- LogSPS("Renaming SPS from '%#s' to '%#s'", name.c, newname.c);
- // When SleepProxyServerCallback gets the mStatus_MemFree message,
- // it will reregister the service under the new name
- m->SPSState = 2;
- mDNS_DeregisterService_drt(m, &m->SPSRecords, mDNS_Dereg_rapid);
- }
- }
-
- if (m->MainCallback)
- m->MainCallback(m, mStatus_ConfigChanged);
- }
-
-mDNSlocal void DynDNSHostNameCallback(mDNS *const m, AuthRecord *const rr, mStatus result)
- {
- (void)m; // unused
- debugf("NameStatusCallback: result %d for registration of name %##s", result, rr->resrec.name->c);
- mDNSPlatformDynDNSHostNameStatusChanged(rr->resrec.name, result);
- }
-
-mDNSlocal void PurgeOrReconfirmCacheRecord(mDNS *const m, CacheRecord *cr, const DNSServer * const ptr, mDNSBool lameduck)
- {
- mDNSBool purge = cr->resrec.RecordType == kDNSRecordTypePacketNegative ||
- cr->resrec.rrtype == kDNSType_A ||
- cr->resrec.rrtype == kDNSType_AAAA ||
- cr->resrec.rrtype == kDNSType_SRV;
-
- (void) lameduck;
- (void) ptr;
- debugf("PurgeOrReconfirmCacheRecord: %s cache record due to %s server %p %#a:%d (%##s): %s",
- purge ? "purging" : "reconfirming",
- lameduck ? "lame duck" : "new",
- ptr, &ptr->addr, mDNSVal16(ptr->port), ptr->domain.c, CRDisplayString(m, cr));
-
- if (purge)
- {
- LogInfo("PurgeorReconfirmCacheRecord: Purging Resourcerecord %s, RecordType %x", CRDisplayString(m, cr), cr->resrec.RecordType);
- mDNS_PurgeCacheResourceRecord(m, cr);
- }
- else
- {
- LogInfo("PurgeorReconfirmCacheRecord: Reconfirming Resourcerecord %s, RecordType %x", CRDisplayString(m, cr), cr->resrec.RecordType);
- mDNS_Reconfirm_internal(m, cr, kDefaultReconfirmTimeForNoAnswer);
- }
- }
-
-mDNSlocal void mDNS_PurgeBeforeResolve(mDNS *const m, DNSQuestion *q)
- {
- const mDNSu32 slot = HashSlot(&q->qname);
- CacheGroup *const cg = CacheGroupForName(m, slot, q->qnamehash, &q->qname);
- CacheRecord *rp;
-
- for (rp = cg ? cg->members : mDNSNULL; rp; rp = rp->next)
- {
- if (SameNameRecordAnswersQuestion(&rp->resrec, q))
- {
- LogInfo("mDNS_PurgeBeforeResolve: Flushing %s", CRDisplayString(m, rp));
- mDNS_PurgeCacheResourceRecord(m, rp);
- }
- }
- }
-
-mDNSlocal void CacheRecordResetDNSServer(mDNS *const m, DNSQuestion *q, DNSServer *new)
- {
- const mDNSu32 slot = HashSlot(&q->qname);
- CacheGroup *const cg = CacheGroupForName(m, slot, q->qnamehash, &q->qname);
- CacheRecord *rp;
- mDNSBool found = mDNSfalse;
- mDNSBool foundNew = mDNSfalse;
- DNSServer *old = q->qDNSServer;
- mDNSBool newQuestion = IsQuestionNew(m, q);
- DNSQuestion *qptr;
-
- // This function is called when the DNSServer is updated to the new question. There may already be
- // some cache entries matching the old DNSServer and/or new DNSServer. There are four cases. In the
- // following table, "Yes" denotes that a cache entry was found for old/new DNSServer.
- //
- // old DNSServer new DNSServer
- //
- // Case 1 Yes Yes
- // Case 2 No Yes
- // Case 3 Yes No
- // Case 4 No No
- //
- // Case 1: There are cache entries for both old and new DNSServer. We handle this case by simply
- // expiring the old Cache entries, deliver a RMV event (if an ADD event was delivered before)
- // followed by the ADD event of the cache entries corresponding to the new server. This
- // case happens when we pick a DNSServer, issue a query and get a valid response and create
- // cache entries after which it stops responding. Another query (non-duplicate) picks a different
- // DNSServer and creates identical cache entries (perhaps through records in Additional records).
- // Now if the first one expires and tries to pick the new DNSServer (the original DNSServer
- // is not responding) we will find cache entries corresponding to both DNSServers.
- //
- // Case 2: There are no cache entries for the old DNSServer but there are some for the new DNSServer.
- // This means we should deliver an ADD event. Normally ADD events are delivered by
- // AnswerNewQuestion if it is a new question. So, we check to see if it is a new question
- // and if so, leave it to AnswerNewQuestion to deliver it. Otherwise, we use
- // AnswerQuestionsForDNSServerChanges to deliver the ADD event. This case happens when a
- // question picks a DNS server for which AnswerNewQuestion could not deliver an answer even
- // though there were potential cache entries but DNSServer did not match. Now when we
- // pick a new DNSServer, those cache entries may answer this question.
- //
- // Case 3: There are the cache entries for the old DNSServer but none for the new. We just move
- // the old cache entries to point to the new DNSServer and the caller is expected to
- // do a purge or reconfirm to delete or validate the RDATA. We don't need to do anything
- // special for delivering ADD events, as it should have been done/will be done by
- // AnswerNewQuestion. This case happens when we picked a DNSServer, sent the query and
- // got a response and the cache is expired now and we are reissuing the question but the
- // original DNSServer does not respond.
- //
- // Case 4: There are no cache entries either for the old or for the new DNSServer. There is nothing
- // much we can do here.
- //
- // Case 2 and 3 are the most common while case 4 is possible when no DNSServers are working. Case 1
- // is relatively less likely to happen in practice
-
- // Temporarily set the DNSServer to look for the matching records for the new DNSServer.
- q->qDNSServer = new;
- for (rp = cg ? cg->members : mDNSNULL; rp; rp = rp->next)
- {
- if (SameNameRecordAnswersQuestion(&rp->resrec, q))
- {
- LogInfo("CacheRecordResetDNSServer: Found cache record %##s for new DNSServer address: %#a", rp->resrec.name->c,
- (rp->resrec.rDNSServer != mDNSNULL ? &rp->resrec.rDNSServer->addr : mDNSNULL));
- foundNew = mDNStrue;
- break;
- }
- }
- q->qDNSServer = old;
-
- for (rp = cg ? cg->members : mDNSNULL; rp; rp = rp->next)
- {
- if (SameNameRecordAnswersQuestion(&rp->resrec, q))
- {
- // Case1
- found = mDNStrue;
- if (foundNew)
- {
- LogInfo("CacheRecordResetDNSServer: Flushing Resourcerecord %##s, before:%#a, after:%#a", rp->resrec.name->c,
- (rp->resrec.rDNSServer != mDNSNULL ? &rp->resrec.rDNSServer->addr : mDNSNULL),
- (new != mDNSNULL ? &new->addr : mDNSNULL));
- mDNS_PurgeCacheResourceRecord(m, rp);
- if (newQuestion)
- {
- // "q" is not a duplicate question. If it is a newQuestion, then the CRActiveQuestion can't be
- // possibly set as it is set only when we deliver the ADD event to the question.
- if (rp->CRActiveQuestion != mDNSNULL)
- {
- LogMsg("CacheRecordResetDNSServer: ERROR!!: CRActiveQuestion %p set, current question %p, name %##s", rp->CRActiveQuestion, q, q->qname.c);
- rp->CRActiveQuestion = mDNSNULL;
- }
- // if this is a new question, then we never delivered an ADD yet, so don't deliver the RMV.
- continue;
- }
- }
- LogInfo("CacheRecordResetDNSServer: resetting cache record %##s DNSServer address before:%#a,"
- " after:%#a, CRActiveQuestion %p", rp->resrec.name->c, (rp->resrec.rDNSServer != mDNSNULL ?
- &rp->resrec.rDNSServer->addr : mDNSNULL), (new != mDNSNULL ? &new->addr : mDNSNULL),
- rp->CRActiveQuestion);
- // Though we set it to the new DNS server, the caller is *assumed* to do either a purge
- // or reconfirm or send out questions to the "new" server to verify whether the cached
- // RDATA is valid
- rp->resrec.rDNSServer = new;
- }
- }
-
- // Case 1 and Case 2
- if ((found && foundNew) || (!found && foundNew))
- {
- if (newQuestion)
- LogInfo("CacheRecordResetDNSServer: deliverAddEvents not set for question %p %##s (%s)", q, q->qname.c, DNSTypeName(q->qtype));
- else if (QuerySuppressed(q))
- LogInfo("CacheRecordResetDNSServer: deliverAddEvents not set for suppressed question %p %##s (%s)", q, q->qname.c, DNSTypeName(q->qtype));
- else
- {
- LogInfo("CacheRecordResetDNSServer: deliverAddEvents set for %p %##s (%s)", q, q->qname.c, DNSTypeName(q->qtype));
- q->deliverAddEvents = mDNStrue;
- for (qptr = q->next; qptr; qptr = qptr->next)
- if (qptr->DuplicateOf == q) qptr->deliverAddEvents = mDNStrue;
- }
- return;
- }
-
- // Case 3 and Case 4
- return;
- }
-
-mDNSexport void DNSServerChangeForQuestion(mDNS *const m, DNSQuestion *q, DNSServer *new)
- {
- DNSQuestion *qptr;
-
- // 1. Whenever we change the DNS server, we change the message identifier also so that response
- // from the old server is not accepted as a response from the new server but only messages
- // from the new server are accepted as valid responses. We do it irrespective of whether "new"
- // is NULL or not. It is possible that we send two queries, no responses, pick a new DNS server
- // which is NULL and now the response comes back and will try to penalize the DNS server which
- // is NULL. By setting the messageID here, we will not accept that as a valid response.
-
- q->TargetQID = mDNS_NewMessageID(m);
-
- // 2. Move the old cache records to point them at the new DNSServer so that we can deliver the ADD/RMV events
- // appropriately. At any point in time, we want all the cache records point only to one DNSServer for a given
- // question. "DNSServer" here is the DNSServer object and not the DNS server itself. It is possible to
- // have the same DNS server address in two objects, one scoped and another not scoped. But, the cache is per
- // DNSServer object. By maintaining the question and the cache entries point to the same DNSServer
- // always, the cache maintenance and delivery of ADD/RMV events becomes simpler.
- //
- // CacheRecordResetDNSServer should be called only once for the non-duplicate question as once the cache
- // entries are moved to point to the new DNSServer, we don't need to call it for the duplicate question
- // and it is wrong to call for the duplicate question as it's decision to mark deliverAddevents will be
- // incorrect.
-
- if (q->DuplicateOf)
- LogMsg("DNSServerChangeForQuestion: ERROR: Called for duplicate question %##s", q->qname.c);
- else
- CacheRecordResetDNSServer(m, q, new);
-
- // 3. Make sure all the duplicate questions point to the same DNSServer so that delivery
- // of events for all of them are consistent. Duplicates for a question are always inserted
- // after in the list.
- q->qDNSServer = new;
- for (qptr = q->next ; qptr; qptr = qptr->next)
- {
- if (qptr->DuplicateOf == q) { qptr->validDNSServers = q->validDNSServers; qptr->qDNSServer = new; }
- }
- }
-
-mDNSexport mStatus uDNS_SetupDNSConfig(mDNS *const m)
- {
- mDNSu32 slot;
- CacheGroup *cg;
- CacheRecord *cr;
-
- mDNSAddr v4, v6, r;
- domainname fqdn;
- DNSServer *ptr, **p = &m->DNSServers;
- const DNSServer *oldServers = m->DNSServers;
- DNSQuestion *q;
- McastResolver *mr, **mres = &m->McastResolvers;
-
- debugf("uDNS_SetupDNSConfig: entry");
-
- // Let the platform layer get the current DNS information
- // The m->StartWABQueries is set when we get the first domain enumeration query (no need to hit the network
- // with domain enumeration queries until we actually need that information). Even if it is not set, we still
- // need to setup the search domains so that we can append them to queries that need them.
-
- uDNS_SetupSearchDomains(m, m->StartWABQueries ? UDNS_START_WAB_QUERY : 0);
-
- mDNS_Lock(m);
-
- for (ptr = m->DNSServers; ptr; ptr = ptr->next)
- {
- ptr->penaltyTime = 0;
- ptr->flags |= DNSServer_FlagDelete;
- }
-
- // We handle the mcast resolvers here itself as mDNSPlatformSetDNSConfig looks at
- // mcast resolvers. Today we get both mcast and ucast configuration using the same
- // API
- for (mr = m->McastResolvers; mr; mr = mr->next)
- mr->flags |= McastResolver_FlagDelete;
-
- mDNSPlatformSetDNSConfig(m, mDNStrue, mDNSfalse, &fqdn, mDNSNULL, mDNSNULL);
-
- // For now, we just delete the mcast resolvers. We don't deal with cache or
- // questions here. Neither question nor cache point to mcast resolvers. Questions
- // do inherit the timeout values from mcast resolvers. But we don't bother
- // affecting them as they never change.
- while (*mres)
- {
- if (((*mres)->flags & DNSServer_FlagDelete) != 0)
- {
- mr = *mres;
- *mres = (*mres)->next;
- debugf("uDNS_SetupDNSConfig: Deleting mcast resolver %##s", mr, mr->domain.c);
- mDNSPlatformMemFree(mr);
- }
- else
- {
- (*mres)->flags &= ~McastResolver_FlagNew;
- mres = &(*mres)->next;
- }
- }
-
- // Mark the records to be flushed that match a new resolver. We need to do this before
- // we walk the questions below where we change the DNSServer pointer of the cache
- // record
- FORALL_CACHERECORDS(slot, cg, cr)
- {
- if (cr->resrec.InterfaceID) continue;
-
- // We just mark them for purge or reconfirm. We can't affect the DNSServer pointer
- // here as the code below that calls CacheRecordResetDNSServer relies on this
- //
- // The new DNSServer may be a scoped or non-scoped one. We use the active question's
- // InterfaceID for looking up the right DNS server
- ptr = GetServerForName(m, cr->resrec.name, cr->CRActiveQuestion ? cr->CRActiveQuestion->InterfaceID : mDNSNULL);
-
- // Purge or Reconfirm if this cache entry would use the new DNS server
- if (ptr && (ptr != cr->resrec.rDNSServer))
- {
- // As the DNSServers for this cache record is not the same anymore, we don't
- // want any new questions to pick this old value
- if (cr->CRActiveQuestion == mDNSNULL)
- {
- LogInfo("uDNS_SetupDNSConfig: Purging Resourcerecord %s", CRDisplayString(m, cr));
- mDNS_PurgeCacheResourceRecord(m, cr);
- }
- else
- {
- LogInfo("uDNS_SetupDNSConfig: Purging/Reconfirming Resourcerecord %s", CRDisplayString(m, cr));
- PurgeOrReconfirmCacheRecord(m, cr, ptr, mDNSfalse);
- }
- }
- }
- // Update our qDNSServer pointers before we go and free the DNSServer object memory
- for (q = m->Questions; q; q=q->next)
- if (!mDNSOpaque16IsZero(q->TargetQID))
- {
- DNSServer *s, *t;
- DNSQuestion *qptr;
- if (q->DuplicateOf) continue;
- SetValidDNSServers(m, q);
- q->triedAllServersOnce = 0;
- s = GetServerForQuestion(m, q);
- t = q->qDNSServer;
- if (t != s)
- {
- // If DNS Server for this question has changed, reactivate it
- debugf("uDNS_SetupDNSConfig: Updating DNS Server from %p %#a:%d (%##s) to %p %#a:%d (%##s) for %##s (%s)",
- t, t ? &t->addr : mDNSNULL, mDNSVal16(t ? t->port : zeroIPPort), t ? t->domain.c : (mDNSu8*)"",
- s, s ? &s->addr : mDNSNULL, mDNSVal16(s ? s->port : zeroIPPort), s ? s->domain.c : (mDNSu8*)"",
- q->qname.c, DNSTypeName(q->qtype));
-
- // After we reset the DNSServer pointer on the cache records here, three things could happen:
- //
- // 1) The query gets sent out and when the actual response comes back later it is possible
- // that the response has the same RDATA, in which case we update our cache entry.
- // If the response is different, then the entry will expire and a new entry gets added.
- // For the latter case to generate a RMV followed by ADD events, we need to reset the DNS
- // server here to match the question and the cache record.
- //
- // 2) We might have marked the cache entries for purge above and for us to be able to generate the RMV
- // events for the questions, the DNSServer on the question should match the Cache Record
- //
- // 3) We might have marked the cache entries for reconfirm above, for which we send the query out which is
- // the same as the first case above.
-
- DNSServerChangeForQuestion(m, q, s);
- q->unansweredQueries = 0;
- // We still need to pick a new DNSServer for the questions that have been
- // suppressed, but it is wrong to activate the query as DNS server change
- // could not possibly change the status of SuppressUnusable questions
- if (!QuerySuppressed(q))
- {
- debugf("uDNS_SetupDNSConfig: Activating query %p %##s (%s)", q, q->qname.c, DNSTypeName(q->qtype));
- ActivateUnicastQuery(m, q, mDNStrue);
- // ActivateUnicastQuery is called for duplicate questions also as it does something
- // special for AutoTunnel questions
- for (qptr = q->next ; qptr; qptr = qptr->next)
- {
- if (qptr->DuplicateOf == q) ActivateUnicastQuery(m, qptr, mDNStrue);
- }
- }
- }
- else
- {
- debugf("uDNS_SetupDNSConfig: Not Updating DNS server question %p %##s (%s) DNS server %#a:%d %p %d",
- q, q->qname.c, DNSTypeName(q->qtype), t ? &t->addr : mDNSNULL, mDNSVal16(t ? t->port : zeroIPPort), q->DuplicateOf, q->SuppressUnusable);
- for (qptr = q->next ; qptr; qptr = qptr->next)
- if (qptr->DuplicateOf == q) { qptr->validDNSServers = q->validDNSServers; qptr->qDNSServer = q->qDNSServer; }
- }
- }
-
- while (*p)
- {
- if (((*p)->flags & DNSServer_FlagDelete) != 0)
- {
- // Scan our cache, looking for uDNS records that we would have queried this server for.
- // We reconfirm any records that match, because in this world of split DNS, firewalls, etc.
- // different DNS servers can give different answers to the same question.
- ptr = *p;
- FORALL_CACHERECORDS(slot, cg, cr)
- {
- if (cr->resrec.InterfaceID) continue;
- if (cr->resrec.rDNSServer == ptr)
- {
- // If we don't have an active question for this cache record, neither Purge can
- // generate RMV events nor Reconfirm can send queries out. Just set the DNSServer
- // pointer on the record NULL so that we don't point to freed memory (We might dereference
- // DNSServer pointers from resource record for logging purposes).
- //
- // If there is an active question, point to its DNSServer as long as it does not point to the
- // freed one. We already went through the questions above and made them point at either the
- // new server or NULL if there is no server and also affected the cache entries that match
- // this question. Hence, whenever we hit a resource record with a DNSServer that is just
- // about to be deleted, we should never have an active question. The code below just tries to
- // be careful logging messages if we ever hit this case.
-
- if (cr->CRActiveQuestion)
- {
- DNSQuestion *qptr = cr->CRActiveQuestion;
- if (qptr->qDNSServer == mDNSNULL)
- LogMsg("uDNS_SetupDNSConfig: Cache Record %s match: Active question %##s (%s) with DNSServer Address NULL, Server to be deleted %#a",
- CRDisplayString(m, cr), qptr->qname.c, DNSTypeName(qptr->qtype), &ptr->addr);
- else
- LogMsg("uDNS_SetupDNSConfig: Cache Record %s match: Active question %##s (%s) DNSServer Address %#a, Server to be deleted %#a",
- CRDisplayString(m, cr), qptr->qname.c, DNSTypeName(qptr->qtype), &qptr->qDNSServer->addr, &ptr->addr);
-
- if (qptr->qDNSServer == ptr)
- {
- qptr->validDNSServers = zeroOpaque64;
- qptr->qDNSServer = mDNSNULL;
- cr->resrec.rDNSServer = mDNSNULL;
- }
- else
- {
- cr->resrec.rDNSServer = qptr->qDNSServer;
- }
- }
- else
- {
- LogInfo("uDNS_SetupDNSConfig: Cache Record %##s has no Active question, Record's DNSServer Address %#a, Server to be deleted %#a",
- cr->resrec.name, &cr->resrec.rDNSServer->addr, &ptr->addr);
- cr->resrec.rDNSServer = mDNSNULL;
- }
-
- PurgeOrReconfirmCacheRecord(m, cr, ptr, mDNStrue);
- }
- }
- *p = (*p)->next;
- debugf("uDNS_SetupDNSConfig: Deleting server %p %#a:%d (%##s)", ptr, &ptr->addr, mDNSVal16(ptr->port), ptr->domain.c);
- mDNSPlatformMemFree(ptr);
- NumUnicastDNSServers--;
- }
- else
- {
- (*p)->flags &= ~DNSServer_FlagNew;
- p = &(*p)->next;
- }
- }
-
- // If we now have no DNS servers at all and we used to have some, then immediately purge all unicast cache records (including for LLQs).
- // This is important for giving prompt remove events when the user disconnects the Ethernet cable or turns off wireless.
- // Otherwise, stale data lingers for 5-10 seconds, which is not the user-experience people expect from Bonjour.
- // Similarly, if we now have some DNS servers and we used to have none, we want to purge any fake negative results we may have generated.
- if ((m->DNSServers != mDNSNULL) != (oldServers != mDNSNULL))
- {
- int count = 0;
- FORALL_CACHERECORDS(slot, cg, cr) if (!cr->resrec.InterfaceID) { mDNS_PurgeCacheResourceRecord(m, cr); count++; }
- LogInfo("uDNS_SetupDNSConfig: %s available; purged %d unicast DNS records from cache",
- m->DNSServers ? "DNS server became" : "No DNS servers", count);
-
- // Force anything that needs to get zone data to get that information again
- RestartRecordGetZoneData(m);
- }
-
- // Did our FQDN change?
- if (!SameDomainName(&fqdn, &m->FQDN))
- {
- if (m->FQDN.c[0]) mDNS_RemoveDynDNSHostName(m, &m->FQDN);
-
- AssignDomainName(&m->FQDN, &fqdn);
-
- if (m->FQDN.c[0])
- {
- mDNSPlatformDynDNSHostNameStatusChanged(&m->FQDN, 1);
- mDNS_AddDynDNSHostName(m, &m->FQDN, DynDNSHostNameCallback, mDNSNULL);
- }
- }
-
- mDNS_Unlock(m);
-
- // handle router and primary interface changes
- v4 = v6 = r = zeroAddr;
- v4.type = r.type = mDNSAddrType_IPv4;
-
- if (mDNSPlatformGetPrimaryInterface(m, &v4, &v6, &r) == mStatus_NoError && !mDNSv4AddressIsLinkLocal(&v4.ip.v4))
- {
- mDNS_SetPrimaryInterfaceInfo(m,
- !mDNSIPv4AddressIsZero(v4.ip.v4) ? &v4 : mDNSNULL,
- !mDNSIPv6AddressIsZero(v6.ip.v6) ? &v6 : mDNSNULL,
- !mDNSIPv4AddressIsZero(r .ip.v4) ? &r : mDNSNULL);
- }
- else
- {
- mDNS_SetPrimaryInterfaceInfo(m, mDNSNULL, mDNSNULL, mDNSNULL);
- if (m->FQDN.c[0]) mDNSPlatformDynDNSHostNameStatusChanged(&m->FQDN, 1); // Set status to 1 to indicate temporary failure
- }
-
- debugf("uDNS_SetupDNSConfig: number of unicast DNS servers %d", NumUnicastDNSServers);
- return mStatus_NoError;
- }
-
-mDNSexport void mDNSCoreInitComplete(mDNS *const m, mStatus result)
- {
- m->mDNSPlatformStatus = result;
- if (m->MainCallback)
- {
- mDNS_Lock(m);
- mDNS_DropLockBeforeCallback(); // Allow client to legally make mDNS API calls from the callback
- m->MainCallback(m, mStatus_NoError);
- mDNS_ReclaimLockAfterCallback(); // Decrement mDNS_reentrancy to block mDNS API calls again
- mDNS_Unlock(m);
- }
- }
-
-mDNSlocal void DeregLoop(mDNS *const m, AuthRecord *const start)
- {
- m->CurrentRecord = start;
- while (m->CurrentRecord)
- {
- AuthRecord *rr = m->CurrentRecord;
- LogInfo("DeregLoop: %s deregistration for %p %02X %s",
- (rr->resrec.RecordType != kDNSRecordTypeDeregistering) ? "Initiating " : "Accelerating",
- rr, rr->resrec.RecordType, ARDisplayString(m, rr));
- if (rr->resrec.RecordType != kDNSRecordTypeDeregistering)
- mDNS_Deregister_internal(m, rr, mDNS_Dereg_rapid);
- else if (rr->AnnounceCount > 1)
- {
- rr->AnnounceCount = 1;
- rr->LastAPTime = m->timenow - rr->ThisAPInterval;
- }
- // Mustn't advance m->CurrentRecord until *after* mDNS_Deregister_internal, because
- // new records could have been added to the end of the list as a result of that call.
- if (m->CurrentRecord == rr) // If m->CurrentRecord was not advanced for us, do it now
- m->CurrentRecord = rr->next;
- }
- }
-
-mDNSexport void mDNS_StartExit(mDNS *const m)
- {
- NetworkInterfaceInfo *intf;
- AuthRecord *rr;
-
- mDNS_Lock(m);
-
- LogInfo("mDNS_StartExit");
- m->ShutdownTime = NonZeroTime(m->timenow + mDNSPlatformOneSecond * 5);
-
- mDNSCoreBeSleepProxyServer_internal(m, 0, 0, 0, 0);
-
-#if APPLE_OSX_mDNSResponder
-#if ! NO_WCF
- CHECK_WCF_FUNCTION(WCFConnectionDealloc)
- {
- if (m->WCF) WCFConnectionDealloc((WCFConnection *)m->WCF);
- }
-#endif
-#endif
-
-#ifndef UNICAST_DISABLED
- {
- SearchListElem *s;
- SuspendLLQs(m);
- // Don't need to do SleepRecordRegistrations() here
- // because we deregister all records and services later in this routine
- while (m->Hostnames) mDNS_RemoveDynDNSHostName(m, &m->Hostnames->fqdn);
-
- // For each member of our SearchList, deregister any records it may have created, and cut them from the list.
- // Otherwise they'll be forcibly deregistered for us (without being cut them from the appropriate list)
- // and we may crash because the list still contains dangling pointers.
- for (s = SearchList; s; s = s->next)
- while (s->AuthRecs)
- {
- ARListElem *dereg = s->AuthRecs;
- s->AuthRecs = s->AuthRecs->next;
- mDNS_Deregister_internal(m, &dereg->ar, mDNS_Dereg_normal); // Memory will be freed in the FreeARElemCallback
- }
- }
-#endif
-
- for (intf = m->HostInterfaces; intf; intf = intf->next)
- if (intf->Advertise)
- DeadvertiseInterface(m, intf);
-
- // Shut down all our active NAT Traversals
- while (m->NATTraversals)
- {
- NATTraversalInfo *t = m->NATTraversals;
- mDNS_StopNATOperation_internal(m, t); // This will cut 't' from the list, thereby advancing m->NATTraversals in the process
-
- // After stopping the NAT Traversal, we zero out the fields.
- // This has particularly important implications for our AutoTunnel records --
- // when we deregister our AutoTunnel records below, we don't want their mStatus_MemFree
- // handlers to just turn around and attempt to re-register those same records.
- // Clearing t->ExternalPort/t->RequestedPort will cause the mStatus_MemFree callback handlers
- // to not do this.
- t->ExternalAddress = zerov4Addr;
- t->ExternalPort = zeroIPPort;
- t->RequestedPort = zeroIPPort;
- t->Lifetime = 0;
- t->Result = mStatus_NoError;
- }
-
- // Make sure there are nothing but deregistering records remaining in the list
- if (m->CurrentRecord)
- LogMsg("mDNS_StartExit: ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord));
-
- // We're in the process of shutting down, so queries, etc. are no longer available.
- // Consequently, determining certain information, e.g. the uDNS update server's IP
- // address, will not be possible. The records on the main list are more likely to
- // already contain such information, so we deregister the duplicate records first.
- LogInfo("mDNS_StartExit: Deregistering duplicate resource records");
- DeregLoop(m, m->DuplicateRecords);
- LogInfo("mDNS_StartExit: Deregistering resource records");
- DeregLoop(m, m->ResourceRecords);
-
- // If we scheduled a response to send goodbye packets, we set NextScheduledResponse to now. Normally when deregistering records,
- // we allow up to 100ms delay (to help improve record grouping) but when shutting down we don't want any such delay.
- if (m->NextScheduledResponse - m->timenow < mDNSPlatformOneSecond)
- {
- m->NextScheduledResponse = m->timenow;
- m->SuppressSending = 0;
- }
-
- if (m->ResourceRecords) LogInfo("mDNS_StartExit: Sending final record deregistrations");
- else LogInfo("mDNS_StartExit: No deregistering records remain");
-
- for (rr = m->DuplicateRecords; rr; rr = rr->next)
- LogMsg("mDNS_StartExit: Should not still have Duplicate Records remaining: %02X %s", rr->resrec.RecordType, ARDisplayString(m, rr));
-
- // If any deregistering records remain, send their deregistration announcements before we exit
- if (m->mDNSPlatformStatus != mStatus_NoError) DiscardDeregistrations(m);
-
- mDNS_Unlock(m);
-
- LogInfo("mDNS_StartExit: done");
- }
-
-mDNSexport void mDNS_FinalExit(mDNS *const m)
- {
- mDNSu32 rrcache_active = 0;
- mDNSu32 rrcache_totalused = 0;
- mDNSu32 slot;
- AuthRecord *rr;
-
- LogInfo("mDNS_FinalExit: mDNSPlatformClose");
- mDNSPlatformClose(m);
-
- rrcache_totalused = m->rrcache_totalused;
- for (slot = 0; slot < CACHE_HASH_SLOTS; slot++)
- {
- while (m->rrcache_hash[slot])
- {
- CacheGroup *cg = m->rrcache_hash[slot];
- while (cg->members)
- {
- CacheRecord *cr = cg->members;
- cg->members = cg->members->next;
- if (cr->CRActiveQuestion) rrcache_active++;
- ReleaseCacheRecord(m, cr);
- }
- cg->rrcache_tail = &cg->members;
- ReleaseCacheGroup(m, &m->rrcache_hash[slot]);
- }
- }
- debugf("mDNS_FinalExit: RR Cache was using %ld records, %lu active", rrcache_totalused, rrcache_active);
- if (rrcache_active != m->rrcache_active)
- LogMsg("*** ERROR *** rrcache_active %lu != m->rrcache_active %lu", rrcache_active, m->rrcache_active);
-
- for (rr = m->ResourceRecords; rr; rr = rr->next)
- LogMsg("mDNS_FinalExit failed to send goodbye for: %p %02X %s", rr, rr->resrec.RecordType, ARDisplayString(m, rr));
-
- LogInfo("mDNS_FinalExit: done");
- }
diff --git a/src/tools/mdnssd/mDNSDebug.c b/src/tools/mdnssd/mDNSDebug.c
deleted file mode 100644
index f111a5dd7b5..00000000000
--- a/src/tools/mdnssd/mDNSDebug.c
+++ /dev/null
@@ -1,93 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
-
- File: mDNSDebug.c
-
- Contains: Implementation of debugging utilities. Requires a POSIX environment.
-
- Version: 1.0
-
- */
-
-#include "mDNSDebug.h"
-
-#include <stdio.h>
-
-#if defined(WIN32) || defined(EFI32) || defined(EFI64) || defined(EFIX64)
-// Need to add Windows/EFI syslog support here
-#define LOG_PID 0x01
-#define LOG_CONS 0x02
-#define LOG_PERROR 0x20
-#else
-#include <syslog.h>
-#endif
-
-#include "mDNSEmbeddedAPI.h"
-
-mDNSexport int mDNS_LoggingEnabled = 0;
-mDNSexport int mDNS_PacketLoggingEnabled = 0;
-
-#if MDNS_DEBUGMSGS
-mDNSexport int mDNS_DebugMode = mDNStrue;
-#else
-mDNSexport int mDNS_DebugMode = mDNSfalse;
-#endif
-
-// Note, this uses mDNS_vsnprintf instead of standard "vsnprintf", because mDNS_vsnprintf knows
-// how to print special data types like IP addresses and length-prefixed domain names
-#if MDNS_DEBUGMSGS > 1
-mDNSexport void verbosedebugf_(const char *format, ...)
- {
- char buffer[512];
- va_list ptr;
- va_start(ptr,format);
- buffer[mDNS_vsnprintf(buffer, sizeof(buffer), format, ptr)] = 0;
- va_end(ptr);
- mDNSPlatformWriteDebugMsg(buffer);
- }
-#endif
-
-// Log message with default "mDNSResponder" ident string at the start
-mDNSlocal void LogMsgWithLevelv(mDNSLogLevel_t logLevel, const char *format, va_list ptr)
- {
- char buffer[512];
- buffer[mDNS_vsnprintf((char *)buffer, sizeof(buffer), format, ptr)] = 0;
- mDNSPlatformWriteLogMsg(ProgramName, buffer, logLevel);
- }
-
-#define LOG_HELPER_BODY(L) \
- { \
- va_list ptr; \
- va_start(ptr,format); \
- LogMsgWithLevelv(L, format, ptr); \
- va_end(ptr); \
- }
-
-// see mDNSDebug.h
-#if !MDNS_HAS_VA_ARG_MACROS
-void LogMsg_(const char *format, ...) LOG_HELPER_BODY(MDNS_LOG_MSG)
-void LogOperation_(const char *format, ...) LOG_HELPER_BODY(MDNS_LOG_OPERATION)
-void LogSPS_(const char *format, ...) LOG_HELPER_BODY(MDNS_LOG_SPS)
-void LogInfo_(const char *format, ...) LOG_HELPER_BODY(MDNS_LOG_INFO)
-#endif
-
-#if MDNS_DEBUGMSGS
-void debugf_(const char *format, ...) LOG_HELPER_BODY(MDNS_LOG_DEBUG)
-#endif
-
-// Log message with default "mDNSResponder" ident string at the start
-mDNSexport void LogMsgWithLevel(mDNSLogLevel_t logLevel, const char *format, ...)
- LOG_HELPER_BODY(logLevel)
diff --git a/src/tools/mdnssd/mDNSDebug.h b/src/tools/mdnssd/mDNSDebug.h
deleted file mode 100755
index 07647b52d45..00000000000
--- a/src/tools/mdnssd/mDNSDebug.h
+++ /dev/null
@@ -1,164 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef __mDNSDebug_h
-#define __mDNSDebug_h
-
-// Set MDNS_DEBUGMSGS to 0 to optimize debugf() calls out of the compiled code
-// Set MDNS_DEBUGMSGS to 1 to generate normal debugging messages
-// Set MDNS_DEBUGMSGS to 2 to generate verbose debugging messages
-// MDNS_DEBUGMSGS is normally set in the project options (or makefile) but can also be set here if desired
-// (If you edit the file here to turn on MDNS_DEBUGMSGS while you're debugging some code, be careful
-// not to accidentally check-in that change by mistake when you check in your other changes.)
-
-//#undef MDNS_DEBUGMSGS
-//#define MDNS_DEBUGMSGS 2
-
-// Set MDNS_CHECK_PRINTF_STYLE_FUNCTIONS to 1 to enable extra GCC compiler warnings
-// Note: You don't normally want to do this, because it generates a bunch of
-// spurious warnings for the following custom extensions implemented by mDNS_vsnprintf:
-// warning: `#' flag used with `%s' printf format (for %#s -- pascal string format)
-// warning: repeated `#' flag in format (for %##s -- DNS name string format)
-// warning: double format, pointer arg (arg 2) (for %.4a, %.16a, %#a -- IP address formats)
-#define MDNS_CHECK_PRINTF_STYLE_FUNCTIONS 0
-
-typedef enum
- {
- MDNS_LOG_MSG,
- MDNS_LOG_OPERATION,
- MDNS_LOG_SPS,
- MDNS_LOG_INFO,
- MDNS_LOG_DEBUG,
- } mDNSLogLevel_t;
-
-// Set this symbol to 1 to answer remote queries for our Address, reverse mapping PTR, and HINFO records
-#define ANSWER_REMOTE_HOSTNAME_QUERIES 0
-
-// Set this symbol to 1 to do extra debug checks on malloc() and free()
-// Set this symbol to 2 to write a log message for every malloc() and free()
-//#define MACOSX_MDNS_MALLOC_DEBUGGING 1
-
-//#define ForceAlerts 1
-//#define LogTimeStamps 1
-
-// Developer-settings section ends here
-
-#if MDNS_CHECK_PRINTF_STYLE_FUNCTIONS
-#define IS_A_PRINTF_STYLE_FUNCTION(F,A) __attribute__ ((format(printf,F,A)))
-#else
-#define IS_A_PRINTF_STYLE_FUNCTION(F,A)
-#endif
-
-#ifdef __cplusplus
- extern "C" {
-#endif
-
-// Variable argument macro support. Use ANSI C99 __VA_ARGS__ where possible. Otherwise, use the next best thing.
-
-#if (defined(__GNUC__))
- #if ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 2)))
- #define MDNS_C99_VA_ARGS 1
- #define MDNS_GNU_VA_ARGS 0
- #else
- #define MDNS_C99_VA_ARGS 0
- #define MDNS_GNU_VA_ARGS 1
- #endif
- #define MDNS_HAS_VA_ARG_MACROS 1
-#elif (_MSC_VER >= 1400) // Visual Studio 2005 and later
- #define MDNS_C99_VA_ARGS 1
- #define MDNS_GNU_VA_ARGS 0
- #define MDNS_HAS_VA_ARG_MACROS 1
-#elif (defined(__MWERKS__))
- #define MDNS_C99_VA_ARGS 1
- #define MDNS_GNU_VA_ARGS 0
- #define MDNS_HAS_VA_ARG_MACROS 1
-#else
- #define MDNS_C99_VA_ARGS 0
- #define MDNS_GNU_VA_ARGS 0
- #define MDNS_HAS_VA_ARG_MACROS 0
-#endif
-
-#if (MDNS_HAS_VA_ARG_MACROS)
- #if (MDNS_C99_VA_ARGS)
- #define debug_noop( ... ) ((void)0)
- #define LogMsg( ... ) LogMsgWithLevel(MDNS_LOG_MSG, __VA_ARGS__)
- #define LogOperation( ... ) do { if (mDNS_LoggingEnabled) LogMsgWithLevel(MDNS_LOG_OPERATION, __VA_ARGS__); } while (0)
- #define LogSPS( ... ) do { if (mDNS_LoggingEnabled) LogMsgWithLevel(MDNS_LOG_SPS, __VA_ARGS__); } while (0)
- #define LogInfo( ... ) do { if (mDNS_LoggingEnabled) LogMsgWithLevel(MDNS_LOG_INFO, __VA_ARGS__); } while (0)
- #elif (MDNS_GNU_VA_ARGS)
- #define debug_noop( ARGS... ) ((void)0)
- #define LogMsg( ARGS... ) LogMsgWithLevel(MDNS_LOG_MSG, ARGS)
- #define LogOperation( ARGS... ) do { if (mDNS_LoggingEnabled) LogMsgWithLevel(MDNS_LOG_OPERATION, ARGS); } while (0)
- #define LogSPS( ARGS... ) do { if (mDNS_LoggingEnabled) LogMsgWithLevel(MDNS_LOG_SPS, ARGS); } while (0)
- #define LogInfo( ARGS... ) do { if (mDNS_LoggingEnabled) LogMsgWithLevel(MDNS_LOG_INFO, ARGS); } while (0)
- #else
- #error Unknown variadic macros
- #endif
-#else
- // If your platform does not support variadic macros, you need to define the following variadic functions.
- // See mDNSShared/mDNSDebug.c for sample implementation
- #define debug_noop 1 ? (void)0 : (void)
- #define LogMsg LogMsg_
- #define LogOperation (mDNS_LoggingEnabled == 0) ? ((void)0) : LogOperation_
- #define LogSPS (mDNS_LoggingEnabled == 0) ? ((void)0) : LogSPS_
- #define LogInfo (mDNS_LoggingEnabled == 0) ? ((void)0) : LogInfo_
- extern void LogMsg_(const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(1,2);
- extern void LogOperation_(const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(1,2);
- extern void LogSPS_(const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(1,2);
- extern void LogInfo_(const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(1,2);
-#endif
-
-#if MDNS_DEBUGMSGS
-#define debugf debugf_
-extern void debugf_(const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(1,2);
-#else
-#define debugf debug_noop
-#endif
-
-#if MDNS_DEBUGMSGS > 1
-#define verbosedebugf verbosedebugf_
-extern void verbosedebugf_(const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(1,2);
-#else
-#define verbosedebugf debug_noop
-#endif
-
-extern int mDNS_LoggingEnabled;
-extern int mDNS_PacketLoggingEnabled;
-extern int mDNS_DebugMode; // If non-zero, LogMsg() writes to stderr instead of syslog
-extern const char ProgramName[];
-
-extern void LogMsgWithLevel(mDNSLogLevel_t logLevel, const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(2,3);
-// LogMsgNoIdent needs to be fixed so that it logs without the ident prefix like it used to
-// (or completely overhauled to use the new "log to a separate file" facility)
-#define LogMsgNoIdent LogMsg
-
-#if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING >= 1
-extern void *mallocL(char *msg, unsigned int size);
-extern void freeL(char *msg, void *x);
-extern void LogMemCorruption(const char *format, ...);
-extern void uds_validatelists(void);
-extern void udns_validatelists(void *const v);
-#else
-#define mallocL(X,Y) malloc(Y)
-#define freeL(X,Y) free(Y)
-#endif
-
-#ifdef __cplusplus
- }
-#endif
-
-#endif
diff --git a/src/tools/mdnssd/mDNSEmbeddedAPI.h b/src/tools/mdnssd/mDNSEmbeddedAPI.h
deleted file mode 100755
index 7310dc56e3d..00000000000
--- a/src/tools/mdnssd/mDNSEmbeddedAPI.h
+++ /dev/null
@@ -1,2964 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
-
- NOTE:
- If you're building an application that uses DNS Service Discovery
- this is probably NOT the header file you're looking for.
- In most cases you will want to use /usr/include/dns_sd.h instead.
-
- This header file defines the lowest level raw interface to mDNSCore,
- which is appropriate *only* on tiny embedded systems where everything
- runs in a single address space and memory is extremely constrained.
- All the APIs here are malloc-free, which means that the caller is
- responsible for passing in a pointer to the relevant storage that
- will be used in the execution of that call, and (when called with
- correct parameters) all the calls are guaranteed to succeed. There
- is never a case where a call can suffer intermittent failures because
- the implementation calls malloc() and sometimes malloc() returns NULL
- because memory is so limited that no more is available.
- This is primarily for devices that need to have precisely known fixed
- memory requirements, with absolutely no uncertainty or run-time variation,
- but that certainty comes at a cost of more difficult programming.
-
- For applications running on general-purpose desktop operating systems
- (Mac OS, Linux, Solaris, Windows, etc.) the API you should use is
- /usr/include/dns_sd.h, which defines the API by which multiple
- independent client processes communicate their DNS Service Discovery
- requests to a single "mdnsd" daemon running in the background.
-
- Even on platforms that don't run multiple independent processes in
- multiple independent address spaces, you can still use the preferred
- dns_sd.h APIs by linking in "dnssd_clientshim.c", which implements
- the standard "dns_sd.h" API calls, allocates any required storage
- using malloc(), and then calls through to the low-level malloc-free
- mDNSCore routines defined here. This has the benefit that even though
- you're running on a small embedded system with a single address space,
- you can still use the exact same client C code as you'd use on a
- general-purpose desktop system.
-
- */
-
-#ifndef __mDNSClientAPI_h
-#define __mDNSClientAPI_h
-
-#if defined(EFI32) || defined(EFI64) || defined(EFIX64)
-// EFI doesn't have stdarg.h unless it's building with GCC.
-#include "Tiano.h"
-#if !defined(__GNUC__)
-#define va_list VA_LIST
-#define va_start(a, b) VA_START(a, b)
-#define va_end(a) VA_END(a)
-#define va_arg(a, b) VA_ARG(a, b)
-#endif
-#else
-#include <stdarg.h> // stdarg.h is required for for va_list support for the mDNS_vsnprintf declaration
-#endif
-
-#include "mDNSDebug.h"
-#if APPLE_OSX_mDNSResponder
-#include <uuid/uuid.h>
-#endif
-
-#ifdef __cplusplus
- extern "C" {
-#endif
-
-// ***************************************************************************
-// Function scope indicators
-
-// If you see "mDNSlocal" before a function name in a C file, it means the function is not callable outside this file
-#ifndef mDNSlocal
-#define mDNSlocal static
-#endif
-// If you see "mDNSexport" before a symbol in a C file, it means the symbol is exported for use by clients
-// For every "mDNSexport" in a C file, there needs to be a corresponding "extern" declaration in some header file
-// (When a C file #includes a header file, the "extern" declarations tell the compiler:
-// "This symbol exists -- but not necessarily in this C file.")
-#ifndef mDNSexport
-#define mDNSexport
-#endif
-
-// Explanation: These local/export markers are a little habit of mine for signaling the programmers' intentions.
-// When "mDNSlocal" is just a synonym for "static", and "mDNSexport" is a complete no-op, you could be
-// forgiven for asking what purpose they serve. The idea is that if you see "mDNSexport" in front of a
-// function definition it means the programmer intended it to be exported and callable from other files
-// in the project. If you see "mDNSlocal" in front of a function definition it means the programmer
-// intended it to be private to that file. If you see neither in front of a function definition it
-// means the programmer forgot (so you should work out which it is supposed to be, and fix it).
-// Using "mDNSlocal" instead of "static" makes it easier to do a textual searches for one or the other.
-// For example you can do a search for "static" to find if any functions declare any local variables as "static"
-// (generally a bad idea unless it's also "const", because static storage usually risks being non-thread-safe)
-// without the results being cluttered with hundreds of matches for functions declared static.
-// - Stuart Cheshire
-
-// ***************************************************************************
-// Structure packing macro
-
-// If we're not using GNUC, it's not fatal.
-// Most compilers naturally pack the on-the-wire structures correctly anyway, so a plain "struct" is usually fine.
-// In the event that structures are not packed correctly, mDNS_Init() will detect this and report an error, so the
-// developer will know what's wrong, and can investigate what needs to be done on that compiler to provide proper packing.
-#ifndef packedstruct
- #if ((__GNUC__ > 2) || ((__GNUC__ == 2) && (__GNUC_MINOR__ >= 9)))
- #define packedstruct struct __attribute__((__packed__))
- #define packedunion union __attribute__((__packed__))
- #else
- #define packedstruct struct
- #define packedunion union
- #endif
-#endif
-
-// ***************************************************************************
-#if 0
-#pragma mark - DNS Resource Record class and type constants
-#endif
-
-typedef enum // From RFC 1035
- {
- kDNSClass_IN = 1, // Internet
- kDNSClass_CS = 2, // CSNET
- kDNSClass_CH = 3, // CHAOS
- kDNSClass_HS = 4, // Hesiod
- kDNSClass_NONE = 254, // Used in DNS UPDATE [RFC 2136]
-
- kDNSClass_Mask = 0x7FFF,// Multicast DNS uses the bottom 15 bits to identify the record class...
- kDNSClass_UniqueRRSet = 0x8000,// ... and the top bit indicates that all other cached records are now invalid
-
- kDNSQClass_ANY = 255, // Not a DNS class, but a DNS query class, meaning "all classes"
- kDNSQClass_UnicastResponse = 0x8000 // Top bit set in a question means "unicast response acceptable"
- } DNS_ClassValues;
-
-typedef enum // From RFC 1035
- {
- kDNSType_A = 1, // 1 Address
- kDNSType_NS, // 2 Name Server
- kDNSType_MD, // 3 Mail Destination
- kDNSType_MF, // 4 Mail Forwarder
- kDNSType_CNAME, // 5 Canonical Name
- kDNSType_SOA, // 6 Start of Authority
- kDNSType_MB, // 7 Mailbox
- kDNSType_MG, // 8 Mail Group
- kDNSType_MR, // 9 Mail Rename
- kDNSType_NULL, // 10 NULL RR
- kDNSType_WKS, // 11 Well-known-service
- kDNSType_PTR, // 12 Domain name pointer
- kDNSType_HINFO, // 13 Host information
- kDNSType_MINFO, // 14 Mailbox information
- kDNSType_MX, // 15 Mail Exchanger
- kDNSType_TXT, // 16 Arbitrary text string
- kDNSType_RP, // 17 Responsible person
- kDNSType_AFSDB, // 18 AFS cell database
- kDNSType_X25, // 19 X_25 calling address
- kDNSType_ISDN, // 20 ISDN calling address
- kDNSType_RT, // 21 Router
- kDNSType_NSAP, // 22 NSAP address
- kDNSType_NSAP_PTR, // 23 Reverse NSAP lookup (deprecated)
- kDNSType_SIG, // 24 Security signature
- kDNSType_KEY, // 25 Security key
- kDNSType_PX, // 26 X.400 mail mapping
- kDNSType_GPOS, // 27 Geographical position (withdrawn)
- kDNSType_AAAA, // 28 IPv6 Address
- kDNSType_LOC, // 29 Location Information
- kDNSType_NXT, // 30 Next domain (security)
- kDNSType_EID, // 31 Endpoint identifier
- kDNSType_NIMLOC, // 32 Nimrod Locator
- kDNSType_SRV, // 33 Service record
- kDNSType_ATMA, // 34 ATM Address
- kDNSType_NAPTR, // 35 Naming Authority PoinTeR
- kDNSType_KX, // 36 Key Exchange
- kDNSType_CERT, // 37 Certification record
- kDNSType_A6, // 38 IPv6 Address (deprecated)
- kDNSType_DNAME, // 39 Non-terminal DNAME (for IPv6)
- kDNSType_SINK, // 40 Kitchen sink (experimental)
- kDNSType_OPT, // 41 EDNS0 option (meta-RR)
- kDNSType_APL, // 42 Address Prefix List
- kDNSType_DS, // 43 Delegation Signer
- kDNSType_SSHFP, // 44 SSH Key Fingerprint
- kDNSType_IPSECKEY, // 45 IPSECKEY
- kDNSType_RRSIG, // 46 RRSIG
- kDNSType_NSEC, // 47 Denial of Existence
- kDNSType_DNSKEY, // 48 DNSKEY
- kDNSType_DHCID, // 49 DHCP Client Identifier
- kDNSType_NSEC3, // 50 Hashed Authenticated Denial of Existence
- kDNSType_NSEC3PARAM, // 51 Hashed Authenticated Denial of Existence
-
- kDNSType_HIP = 55, // 55 Host Identity Protocol
-
- kDNSType_SPF = 99, // 99 Sender Policy Framework for E-Mail
- kDNSType_UINFO, // 100 IANA-Reserved
- kDNSType_UID, // 101 IANA-Reserved
- kDNSType_GID, // 102 IANA-Reserved
- kDNSType_UNSPEC, // 103 IANA-Reserved
-
- kDNSType_TKEY = 249, // 249 Transaction key
- kDNSType_TSIG, // 250 Transaction signature
- kDNSType_IXFR, // 251 Incremental zone transfer
- kDNSType_AXFR, // 252 Transfer zone of authority
- kDNSType_MAILB, // 253 Transfer mailbox records
- kDNSType_MAILA, // 254 Transfer mail agent records
- kDNSQType_ANY // Not a DNS type, but a DNS query type, meaning "all types"
- } DNS_TypeValues;
-
-// ***************************************************************************
-#if 0
-#pragma mark -
-#pragma mark - Simple types
-#endif
-
-// mDNS defines its own names for these common types to simplify portability across
-// multiple platforms that may each have their own (different) names for these types.
-typedef int mDNSBool;
-typedef signed char mDNSs8;
-typedef unsigned char mDNSu8;
-typedef signed short mDNSs16;
-typedef unsigned short mDNSu16;
-
-// <http://gcc.gnu.org/onlinedocs/gcc-3.3.3/cpp/Common-Predefined-Macros.html> says
-// __LP64__ _LP64
-// These macros are defined, with value 1, if (and only if) the compilation is
-// for a target where long int and pointer both use 64-bits and int uses 32-bit.
-// <http://www.intel.com/software/products/compilers/clin/docs/ug/lin1077.htm> says
-// Macro Name __LP64__ Value 1
-// A quick Google search for "defined(__LP64__)" OR "#ifdef __LP64__" gives 2590 hits and
-// a search for "#if __LP64__" gives only 12, so I think we'll go with the majority and use defined()
-#if defined(_ILP64) || defined(__ILP64__)
-typedef signed int32 mDNSs32;
-typedef unsigned int32 mDNSu32;
-#elif defined(_LP64) || defined(__LP64__)
-typedef signed int mDNSs32;
-typedef unsigned int mDNSu32;
-#else
-typedef signed long mDNSs32;
-typedef unsigned long mDNSu32;
-//typedef signed int mDNSs32;
-//typedef unsigned int mDNSu32;
-#endif
-
-// To enforce useful type checking, we make mDNSInterfaceID be a pointer to a dummy struct
-// This way, mDNSInterfaceIDs can be assigned, and compared with each other, but not with other types
-// Declaring the type to be the typical generic "void *" would lack this type checking
-typedef struct mDNSInterfaceID_dummystruct { void *dummy; } *mDNSInterfaceID;
-
-// These types are for opaque two- and four-byte identifiers.
-// The "NotAnInteger" fields of the unions allow the value to be conveniently passed around in a
-// register for the sake of efficiency, and compared for equality or inequality, but don't forget --
-// just because it is in a register doesn't mean it is an integer. Operations like greater than,
-// less than, add, multiply, increment, decrement, etc., are undefined for opaque identifiers,
-// and if you make the mistake of trying to do those using the NotAnInteger field, then you'll
-// find you get code that doesn't work consistently on big-endian and little-endian machines.
-#if defined(_WIN32)
- #pragma pack(push,2)
-#endif
-typedef union { mDNSu8 b[ 2]; mDNSu16 NotAnInteger; } mDNSOpaque16;
-typedef union { mDNSu8 b[ 4]; mDNSu32 NotAnInteger; } mDNSOpaque32;
-typedef packedunion { mDNSu8 b[ 6]; mDNSu16 w[3]; mDNSu32 l[1]; } mDNSOpaque48;
-typedef union { mDNSu8 b[ 8]; mDNSu16 w[4]; mDNSu32 l[2]; } mDNSOpaque64;
-typedef union { mDNSu8 b[16]; mDNSu16 w[8]; mDNSu32 l[4]; } mDNSOpaque128;
-#if defined(_WIN32)
- #pragma pack(pop)
-#endif
-
-typedef mDNSOpaque16 mDNSIPPort; // An IP port is a two-byte opaque identifier (not an integer)
-typedef mDNSOpaque32 mDNSv4Addr; // An IP address is a four-byte opaque identifier (not an integer)
-typedef mDNSOpaque128 mDNSv6Addr; // An IPv6 address is a 16-byte opaque identifier (not an integer)
-typedef mDNSOpaque48 mDNSEthAddr; // An Ethernet address is a six-byte opaque identifier (not an integer)
-
-// Bit operations for opaque 64 bit quantity. Uses the 32 bit quantity(l[2]) to set and clear bits
-#define mDNSNBBY 8
-#define bit_set_opaque64(op64, index) (op64.l[((index))/(sizeof(mDNSu32) * mDNSNBBY)] |= (1 << ((index) % (sizeof(mDNSu32) * mDNSNBBY))))
-#define bit_clr_opaque64(op64, index) (op64.l[((index))/(sizeof(mDNSu32) * mDNSNBBY)] &= ~(1 << ((index) % (sizeof(mDNSu32) * mDNSNBBY))))
-#define bit_get_opaque64(op64, index) (op64.l[((index))/(sizeof(mDNSu32) * mDNSNBBY)] & (1 << ((index) % (sizeof(mDNSu32) * mDNSNBBY))))
-
-enum
- {
- mDNSAddrType_None = 0,
- mDNSAddrType_IPv4 = 4,
- mDNSAddrType_IPv6 = 6,
- mDNSAddrType_Unknown = ~0 // Special marker value used in known answer list recording
- };
-
-enum
- {
- mDNSTransport_None = 0,
- mDNSTransport_UDP = 1,
- mDNSTransport_TCP = 2
- };
-
-typedef struct
- {
- mDNSs32 type;
- union { mDNSv6Addr v6; mDNSv4Addr v4; } ip;
- } mDNSAddr;
-
-enum { mDNSfalse = 0, mDNStrue = 1 };
-
-#define mDNSNULL 0L
-
-enum
- {
- mStatus_Waiting = 1,
- mStatus_NoError = 0,
-
- // mDNS return values are in the range FFFE FF00 (-65792) to FFFE FFFF (-65537)
- // The top end of the range (FFFE FFFF) is used for error codes;
- // the bottom end of the range (FFFE FF00) is used for non-error values;
-
- // Error codes:
- mStatus_UnknownErr = -65537, // First value: 0xFFFE FFFF
- mStatus_NoSuchNameErr = -65538,
- mStatus_NoMemoryErr = -65539,
- mStatus_BadParamErr = -65540,
- mStatus_BadReferenceErr = -65541,
- mStatus_BadStateErr = -65542,
- mStatus_BadFlagsErr = -65543,
- mStatus_UnsupportedErr = -65544,
- mStatus_NotInitializedErr = -65545,
- mStatus_NoCache = -65546,
- mStatus_AlreadyRegistered = -65547,
- mStatus_NameConflict = -65548,
- mStatus_Invalid = -65549,
- mStatus_Firewall = -65550,
- mStatus_Incompatible = -65551,
- mStatus_BadInterfaceErr = -65552,
- mStatus_Refused = -65553,
- mStatus_NoSuchRecord = -65554,
- mStatus_NoAuth = -65555,
- mStatus_NoSuchKey = -65556,
- mStatus_NATTraversal = -65557,
- mStatus_DoubleNAT = -65558,
- mStatus_BadTime = -65559,
- mStatus_BadSig = -65560, // while we define this per RFC 2845, BIND 9 returns Refused for bad/missing signatures
- mStatus_BadKey = -65561,
- mStatus_TransientErr = -65562, // transient failures, e.g. sending packets shortly after a network transition or wake from sleep
- mStatus_ServiceNotRunning = -65563, // Background daemon not running
- mStatus_NATPortMappingUnsupported = -65564, // NAT doesn't support NAT-PMP or UPnP
- mStatus_NATPortMappingDisabled = -65565, // NAT supports NAT-PMP or UPnP but it's disabled by the administrator
- mStatus_NoRouter = -65566,
- mStatus_PollingMode = -65567,
- mStatus_Timeout = -65568,
- // -65568 to -65786 currently unused; available for allocation
-
- // tcp connection status
- mStatus_ConnPending = -65787,
- mStatus_ConnFailed = -65788,
- mStatus_ConnEstablished = -65789,
-
- // Non-error values:
- mStatus_GrowCache = -65790,
- mStatus_ConfigChanged = -65791,
- mStatus_MemFree = -65792 // Last value: 0xFFFE FF00
- // mStatus_MemFree is the last legal mDNS error code, at the end of the range allocated for mDNS
- };
-
-typedef mDNSs32 mStatus;
-
-// RFC 1034/1035 specify that a domain label consists of a length byte plus up to 63 characters
-#define MAX_DOMAIN_LABEL 63
-typedef struct { mDNSu8 c[ 64]; } domainlabel; // One label: length byte and up to 63 characters
-
-// RFC 1034/1035/2181 specify that a domain name (length bytes and data bytes) may be up to 255 bytes long,
-// plus the terminating zero at the end makes 256 bytes total in the on-the-wire format.
-#define MAX_DOMAIN_NAME 256
-typedef struct { mDNSu8 c[256]; } domainname; // Up to 256 bytes of length-prefixed domainlabels
-
-typedef struct { mDNSu8 c[256]; } UTF8str255; // Null-terminated C string
-
-// The longest legal textual form of a DNS name is 1009 bytes, including the C-string terminating NULL at the end.
-// Explanation:
-// When a native domainname object is converted to printable textual form using ConvertDomainNameToCString(),
-// non-printing characters are represented in the conventional DNS way, as '\ddd', where ddd is a three-digit decimal number.
-// The longest legal domain name is 256 bytes, in the form of four labels as shown below:
-// Length byte, 63 data bytes, length byte, 63 data bytes, length byte, 63 data bytes, length byte, 62 data bytes, zero byte.
-// Each label is encoded textually as characters followed by a trailing dot.
-// If every character has to be represented as a four-byte escape sequence, then this makes the maximum textual form four labels
-// plus the C-string terminating NULL as shown below:
-// 63*4+1 + 63*4+1 + 63*4+1 + 62*4+1 + 1 = 1009.
-// Note that MAX_ESCAPED_DOMAIN_LABEL is not normally used: If you're only decoding a single label, escaping is usually not required.
-// It is for domain names, where dots are used as label separators, that proper escaping is vital.
-#define MAX_ESCAPED_DOMAIN_LABEL 254
-#define MAX_ESCAPED_DOMAIN_NAME 1009
-
-// MAX_REVERSE_MAPPING_NAME
-// For IPv4: "123.123.123.123.in-addr.arpa." 30 bytes including terminating NUL
-// For IPv6: "x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.ip6.arpa." 74 bytes including terminating NUL
-
-#define MAX_REVERSE_MAPPING_NAME_V4 30
-#define MAX_REVERSE_MAPPING_NAME_V6 74
-#define MAX_REVERSE_MAPPING_NAME 74
-
-// Most records have a TTL of 75 minutes, so that their 80% cache-renewal query occurs once per hour.
-// For records containing a hostname (in the name on the left, or in the rdata on the right),
-// like A, AAAA, reverse-mapping PTR, and SRV, we use a two-minute TTL by default, because we don't want
-// them to hang around for too long in the cache if the host in question crashes or otherwise goes away.
-
-#define kStandardTTL (3600UL * 100 / 80)
-#define kHostNameTTL 120UL
-
-// Some applications want to register their SRV records with a lower ttl so that in case the server
-// using a dynamic port number restarts, the clients will not have stale information for more than
-// 10 seconds
-
-#define kHostNameSmallTTL 10UL
-
-
-// Multicast DNS uses announcements (gratuitous responses) to update peer caches.
-// This means it is feasible to use relatively larger TTL values than we might otherwise
-// use, because we have a cache coherency protocol to keep the peer caches up to date.
-// With Unicast DNS, once an authoritative server gives a record with a certain TTL value to a client
-// or caching server, that client or caching server is entitled to hold onto the record until its TTL
-// expires, and has no obligation to contact the authoritative server again until that time arrives.
-// This means that whereas Multicast DNS can use announcements to pre-emptively update stale data
-// before it would otherwise have expired, standard Unicast DNS (not using LLQs) has no equivalent
-// mechanism, and TTL expiry is the *only* mechanism by which stale data gets deleted. Because of this,
-// we currently limit the TTL to ten seconds in such cases where no dynamic cache updating is possible.
-#define kStaticCacheTTL 10
-
-#define DefaultTTLforRRType(X) (((X) == kDNSType_A || (X) == kDNSType_AAAA || (X) == kDNSType_SRV) ? kHostNameTTL : kStandardTTL)
-
-typedef struct AuthRecord_struct AuthRecord;
-typedef struct ServiceRecordSet_struct ServiceRecordSet;
-typedef struct CacheRecord_struct CacheRecord;
-typedef struct CacheGroup_struct CacheGroup;
-typedef struct AuthGroup_struct AuthGroup;
-typedef struct DNSQuestion_struct DNSQuestion;
-typedef struct ZoneData_struct ZoneData;
-typedef struct mDNS_struct mDNS;
-typedef struct mDNS_PlatformSupport_struct mDNS_PlatformSupport;
-typedef struct NATTraversalInfo_struct NATTraversalInfo;
-
-// Structure to abstract away the differences between TCP/SSL sockets, and one for UDP sockets
-// The actual definition of these structures appear in the appropriate platform support code
-typedef struct TCPSocket_struct TCPSocket;
-typedef struct UDPSocket_struct UDPSocket;
-
-// ***************************************************************************
-#if 0
-#pragma mark -
-#pragma mark - DNS Message structures
-#endif
-
-#define mDNS_numZones numQuestions
-#define mDNS_numPrereqs numAnswers
-#define mDNS_numUpdates numAuthorities
-
-typedef packedstruct
- {
- mDNSOpaque16 id;
- mDNSOpaque16 flags;
- mDNSu16 numQuestions;
- mDNSu16 numAnswers;
- mDNSu16 numAuthorities;
- mDNSu16 numAdditionals;
- } DNSMessageHeader;
-
-// We can send and receive packets up to 9000 bytes (Ethernet Jumbo Frame size, if that ever becomes widely used)
-// However, in the normal case we try to limit packets to 1500 bytes so that we don't get IP fragmentation on standard Ethernet
-// 40 (IPv6 header) + 8 (UDP header) + 12 (DNS message header) + 1440 (DNS message body) = 1500 total
-#define AbsoluteMaxDNSMessageData 8940
-#define NormalMaxDNSMessageData 1440
-typedef packedstruct
- {
- DNSMessageHeader h; // Note: Size 12 bytes
- mDNSu8 data[AbsoluteMaxDNSMessageData]; // 40 (IPv6) + 8 (UDP) + 12 (DNS header) + 8940 (data) = 9000
- } DNSMessage;
-
-typedef struct tcpInfo_t
- {
- mDNS *m;
- TCPSocket *sock;
- DNSMessage request;
- int requestLen;
- DNSQuestion *question; // For queries
- AuthRecord *rr; // For record updates
- mDNSAddr Addr;
- mDNSIPPort Port;
- mDNSIPPort SrcPort;
- DNSMessage *reply;
- mDNSu16 replylen;
- unsigned long nread;
- int numReplies;
- } tcpInfo_t;
-
-// ***************************************************************************
-#if 0
-#pragma mark -
-#pragma mark - Other Packet Format Structures
-#endif
-
-typedef packedstruct
- {
- mDNSEthAddr dst;
- mDNSEthAddr src;
- mDNSOpaque16 ethertype;
- } EthernetHeader; // 14 bytes
-
-typedef packedstruct
- {
- mDNSOpaque16 hrd;
- mDNSOpaque16 pro;
- mDNSu8 hln;
- mDNSu8 pln;
- mDNSOpaque16 op;
- mDNSEthAddr sha;
- mDNSv4Addr spa;
- mDNSEthAddr tha;
- mDNSv4Addr tpa;
- } ARP_EthIP; // 28 bytes
-
-typedef packedstruct
- {
- mDNSu8 vlen;
- mDNSu8 tos;
- mDNSu16 totlen;
- mDNSOpaque16 id;
- mDNSOpaque16 flagsfrags;
- mDNSu8 ttl;
- mDNSu8 protocol; // Payload type: 0x06 = TCP, 0x11 = UDP
- mDNSu16 checksum;
- mDNSv4Addr src;
- mDNSv4Addr dst;
- } IPv4Header; // 20 bytes
-
-typedef packedstruct
- {
- mDNSu32 vcf; // Version, Traffic Class, Flow Label
- mDNSu16 len; // Payload Length
- mDNSu8 pro; // Type of next header: 0x06 = TCP, 0x11 = UDP, 0x3A = ICMPv6
- mDNSu8 ttl; // Hop Limit
- mDNSv6Addr src;
- mDNSv6Addr dst;
- } IPv6Header; // 40 bytes
-
-typedef packedstruct
- {
- mDNSv6Addr src;
- mDNSv6Addr dst;
- mDNSOpaque32 len;
- mDNSOpaque32 pro;
- } IPv6PseudoHeader; // 40 bytes
-
-typedef union
- {
- mDNSu8 bytes[20];
- ARP_EthIP arp;
- IPv4Header v4;
- IPv6Header v6;
- } NetworkLayerPacket;
-
-typedef packedstruct
- {
- mDNSIPPort src;
- mDNSIPPort dst;
- mDNSu32 seq;
- mDNSu32 ack;
- mDNSu8 offset;
- mDNSu8 flags;
- mDNSu16 window;
- mDNSu16 checksum;
- mDNSu16 urgent;
- } TCPHeader; // 20 bytes; IP protocol type 0x06
-
-typedef packedstruct
- {
- mDNSIPPort src;
- mDNSIPPort dst;
- mDNSu16 len; // Length including UDP header (i.e. minimum value is 8 bytes)
- mDNSu16 checksum;
- } UDPHeader; // 8 bytes; IP protocol type 0x11
-
-typedef packedstruct
- {
- mDNSu8 type; // 0x87 == Neighbor Solicitation, 0x88 == Neighbor Advertisement
- mDNSu8 code;
- mDNSu16 checksum;
- mDNSu32 flags_res; // R/S/O flags and reserved bits
- mDNSv6Addr target;
- // Typically 8 bytes of options are also present
- } IPv6NDP; // 24 bytes or more; IP protocol type 0x3A
-
-#define NDP_Sol 0x87
-#define NDP_Adv 0x88
-
-#define NDP_Router 0x80
-#define NDP_Solicited 0x40
-#define NDP_Override 0x20
-
-#define NDP_SrcLL 1
-#define NDP_TgtLL 2
-
-typedef union
- {
- mDNSu8 bytes[20];
- TCPHeader tcp;
- UDPHeader udp;
- IPv6NDP ndp;
- } TransportLayerPacket;
-
-typedef packedstruct
- {
- mDNSOpaque64 InitiatorCookie;
- mDNSOpaque64 ResponderCookie;
- mDNSu8 NextPayload;
- mDNSu8 Version;
- mDNSu8 ExchangeType;
- mDNSu8 Flags;
- mDNSOpaque32 MessageID;
- mDNSu32 Length;
- } IKEHeader; // 28 bytes
-
-// ***************************************************************************
-#if 0
-#pragma mark -
-#pragma mark - Resource Record structures
-#endif
-
-// Authoritative Resource Records:
-// There are four basic types: Shared, Advisory, Unique, Known Unique
-
-// * Shared Resource Records do not have to be unique
-// -- Shared Resource Records are used for DNS-SD service PTRs
-// -- It is okay for several hosts to have RRs with the same name but different RDATA
-// -- We use a random delay on responses to reduce collisions when all the hosts respond to the same query
-// -- These RRs typically have moderately high TTLs (e.g. one hour)
-// -- These records are announced on startup and topology changes for the benefit of passive listeners
-// -- These records send a goodbye packet when deregistering
-//
-// * Advisory Resource Records are like Shared Resource Records, except they don't send a goodbye packet
-//
-// * Unique Resource Records should be unique among hosts within any given mDNS scope
-// -- The majority of Resource Records are of this type
-// -- If two entities on the network have RRs with the same name but different RDATA, this is a conflict
-// -- Responses may be sent immediately, because only one host should be responding to any particular query
-// -- These RRs typically have low TTLs (e.g. a few minutes)
-// -- On startup and after topology changes, a host issues queries to verify uniqueness
-
-// * Known Unique Resource Records are treated like Unique Resource Records, except that mDNS does
-// not have to verify their uniqueness because this is already known by other means (e.g. the RR name
-// is derived from the host's IP or Ethernet address, which is already known to be a unique identifier).
-
-// Summary of properties of different record types:
-// Probe? Does this record type send probes before announcing?
-// Conflict? Does this record type react if we observe an apparent conflict?
-// Goodbye? Does this record type send a goodbye packet on departure?
-//
-// Probe? Conflict? Goodbye? Notes
-// Unregistered Should not appear in any list (sanity check value)
-// Shared No No Yes e.g. Service PTR record
-// Deregistering No No Yes Shared record about to announce its departure and leave the list
-// Advisory No No No
-// Unique Yes Yes No Record intended to be unique -- will probe to verify
-// Verified Yes Yes No Record has completed probing, and is verified unique
-// KnownUnique No Yes No Record is assumed by other means to be unique
-
-// Valid lifecycle of a record:
-// Unregistered -> Shared -> Deregistering -(goodbye)-> Unregistered
-// Unregistered -> Advisory -> Unregistered
-// Unregistered -> Unique -(probe)-> Verified -> Unregistered
-// Unregistered -> KnownUnique -> Unregistered
-
-// Each Authoritative kDNSRecordType has only one bit set. This makes it easy to quickly see if a record
-// is one of a particular set of types simply by performing the appropriate bitwise masking operation.
-
-// Cache Resource Records (received from the network):
-// There are four basic types: Answer, Unique Answer, Additional, Unique Additional
-// Bit 7 (the top bit) of kDNSRecordType is always set for Cache Resource Records; always clear for Authoritative Resource Records
-// Bit 6 (value 0x40) is set for answer records; clear for authority/additional records
-// Bit 5 (value 0x20) is set for records received with the kDNSClass_UniqueRRSet
-
-enum
- {
- kDNSRecordTypeUnregistered = 0x00, // Not currently in any list
- kDNSRecordTypeDeregistering = 0x01, // Shared record about to announce its departure and leave the list
-
- kDNSRecordTypeUnique = 0x02, // Will become a kDNSRecordTypeVerified when probing is complete
-
- kDNSRecordTypeAdvisory = 0x04, // Like Shared, but no goodbye packet
- kDNSRecordTypeShared = 0x08, // Shared means record name does not have to be unique -- use random delay on responses
-
- kDNSRecordTypeVerified = 0x10, // Unique means mDNS should check that name is unique (and then send immediate responses)
- kDNSRecordTypeKnownUnique = 0x20, // Known Unique means mDNS can assume name is unique without checking
- // For Dynamic Update records, Known Unique means the record must already exist on the server.
- kDNSRecordTypeUniqueMask = (kDNSRecordTypeUnique | kDNSRecordTypeVerified | kDNSRecordTypeKnownUnique),
- kDNSRecordTypeActiveSharedMask = (kDNSRecordTypeAdvisory | kDNSRecordTypeShared),
- kDNSRecordTypeActiveUniqueMask = (kDNSRecordTypeVerified | kDNSRecordTypeKnownUnique),
- kDNSRecordTypeActiveMask = (kDNSRecordTypeActiveSharedMask | kDNSRecordTypeActiveUniqueMask),
-
- kDNSRecordTypePacketAdd = 0x80, // Received in the Additional Section of a DNS Response
- kDNSRecordTypePacketAddUnique = 0x90, // Received in the Additional Section of a DNS Response with kDNSClass_UniqueRRSet set
- kDNSRecordTypePacketAuth = 0xA0, // Received in the Authorities Section of a DNS Response
- kDNSRecordTypePacketAuthUnique = 0xB0, // Received in the Authorities Section of a DNS Response with kDNSClass_UniqueRRSet set
- kDNSRecordTypePacketAns = 0xC0, // Received in the Answer Section of a DNS Response
- kDNSRecordTypePacketAnsUnique = 0xD0, // Received in the Answer Section of a DNS Response with kDNSClass_UniqueRRSet set
-
- kDNSRecordTypePacketNegative = 0xF0, // Pseudo-RR generated to cache non-existence results like NXDomain
-
- kDNSRecordTypePacketUniqueMask = 0x10 // True for PacketAddUnique, PacketAnsUnique, PacketAuthUnique, kDNSRecordTypePacketNegative
- };
-
-typedef packedstruct { mDNSu16 priority; mDNSu16 weight; mDNSIPPort port; domainname target; } rdataSRV;
-typedef packedstruct { mDNSu16 preference; domainname exchange; } rdataMX;
-typedef packedstruct { domainname mbox; domainname txt; } rdataRP;
-typedef packedstruct { mDNSu16 preference; domainname map822; domainname mapx400; } rdataPX;
-
-typedef packedstruct
- {
- domainname mname;
- domainname rname;
- mDNSs32 serial; // Modular counter; increases when zone changes
- mDNSu32 refresh; // Time in seconds that a slave waits after successful replication of the database before it attempts replication again
- mDNSu32 retry; // Time in seconds that a slave waits after an unsuccessful replication attempt before it attempts replication again
- mDNSu32 expire; // Time in seconds that a slave holds on to old data while replication attempts remain unsuccessful
- mDNSu32 min; // Nominally the minimum record TTL for this zone, in seconds; also used for negative caching.
- } rdataSOA;
-
-// EDNS Option Code registrations are recorded in the "DNS EDNS0 Options" section of
-// <http://www.iana.org/assignments/dns-parameters>
-
-#define kDNSOpt_LLQ 1
-#define kDNSOpt_Lease 2
-#define kDNSOpt_NSID 3
-#define kDNSOpt_Owner 4
-
-typedef struct
- {
- mDNSu16 vers;
- mDNSu16 llqOp;
- mDNSu16 err; // Or UDP reply port, in setup request
- // Note: In the in-memory form, there's typically a two-byte space here, so that the following 64-bit id is word-aligned
- mDNSOpaque64 id;
- mDNSu32 llqlease;
- } LLQOptData;
-
-typedef struct
- {
- mDNSu8 vers; // Version number of this Owner OPT record
- mDNSs8 seq; // Sleep/wake epoch
- mDNSEthAddr HMAC; // Host's primary identifier (e.g. MAC of on-board Ethernet)
- mDNSEthAddr IMAC; // Interface's MAC address (if different to primary MAC)
- mDNSOpaque48 password; // Optional password
- } OwnerOptData;
-
-// Note: rdataOPT format may be repeated an arbitrary number of times in a single resource record
-typedef packedstruct
- {
- mDNSu16 opt;
- mDNSu16 optlen;
- union { LLQOptData llq; mDNSu32 updatelease; OwnerOptData owner; } u;
- } rdataOPT;
-
-// Space needed to put OPT records into a packet:
-// Header 11 bytes (name 1, type 2, class 2, TTL 4, length 2)
-// LLQ rdata 18 bytes (opt 2, len 2, vers 2, op 2, err 2, id 8, lease 4)
-// Lease rdata 8 bytes (opt 2, len 2, lease 4)
-// Owner rdata 12-24 (opt 2, len 2, owner 8-20)
-
-#define DNSOpt_Header_Space 11
-#define DNSOpt_LLQData_Space (4 + 2 + 2 + 2 + 8 + 4)
-#define DNSOpt_LeaseData_Space (4 + 4)
-#define DNSOpt_OwnerData_ID_Space (4 + 2 + 6)
-#define DNSOpt_OwnerData_ID_Wake_Space (4 + 2 + 6 + 6)
-#define DNSOpt_OwnerData_ID_Wake_PW4_Space (4 + 2 + 6 + 6 + 4)
-#define DNSOpt_OwnerData_ID_Wake_PW6_Space (4 + 2 + 6 + 6 + 6)
-
-#define ValidOwnerLength(X) ( (X) == DNSOpt_OwnerData_ID_Space - 4 || \
- (X) == DNSOpt_OwnerData_ID_Wake_Space - 4 || \
- (X) == DNSOpt_OwnerData_ID_Wake_PW4_Space - 4 || \
- (X) == DNSOpt_OwnerData_ID_Wake_PW6_Space - 4 )
-
-#define DNSOpt_Owner_Space(A,B) (mDNSSameEthAddress((A),(B)) ? DNSOpt_OwnerData_ID_Space : DNSOpt_OwnerData_ID_Wake_Space)
-
-#define DNSOpt_Data_Space(O) ( \
- (O)->opt == kDNSOpt_LLQ ? DNSOpt_LLQData_Space : \
- (O)->opt == kDNSOpt_Lease ? DNSOpt_LeaseData_Space : \
- (O)->opt == kDNSOpt_Owner ? DNSOpt_Owner_Space(&(O)->u.owner.HMAC, &(O)->u.owner.IMAC) : 0x10000)
-
-// A maximal NSEC record is:
-// 256 bytes domainname 'nextname'
-// + 256 * 34 = 8704 bytes of bitmap data
-// = 8960 bytes total
-// For now we only support NSEC records encoding DNS types 0-255 and ignore the nextname (we always set it to be the same as the rrname),
-// which gives us a fixed in-memory size of 32 bytes (256 bits)
-typedef struct
- {
- mDNSu8 bitmap[32];
- } rdataNSEC;
-
-// StandardAuthRDSize is 264 (256+8), which is large enough to hold a maximum-sized SRV record (6 + 256 bytes)
-// MaximumRDSize is 8K the absolute maximum we support (at least for now)
-#define StandardAuthRDSize 264
-#define MaximumRDSize 8192
-
-// InlineCacheRDSize is 68
-// Records received from the network with rdata this size or less have their rdata stored right in the CacheRecord object
-// Records received from the network with rdata larger than this have additional storage allocated for the rdata
-// A quick unscientific sample from a busy network at Apple with lots of machines revealed this:
-// 1461 records in cache
-// 292 were one-byte TXT records
-// 136 were four-byte A records
-// 184 were sixteen-byte AAAA records
-// 780 were various PTR, TXT and SRV records from 12-64 bytes
-// Only 69 records had rdata bigger than 64 bytes
-// Note that since CacheRecord object and a CacheGroup object are allocated out of the same pool, it's sensible to
-// have them both be the same size. Making one smaller without making the other smaller won't actually save any memory.
-#define InlineCacheRDSize 68
-
-// On 64-bit, the pointers in a CacheRecord are bigger, and that creates 8 bytes more space for the name in a CacheGroup
-#if ENABLE_MULTI_PACKET_QUERY_SNOOPING
- #if defined(_ILP64) || defined(__ILP64__) || defined(_LP64) || defined(__LP64__) || defined(_WIN64)
- #define InlineCacheGroupNameSize 160
- #else
- #define InlineCacheGroupNameSize 148
- #endif
-#else
- #if defined(_ILP64) || defined(__ILP64__) || defined(_LP64) || defined(__LP64__) || defined(_WIN64)
- #define InlineCacheGroupNameSize 144
- #else
- #define InlineCacheGroupNameSize 132
- #endif
-#endif
-
-// The RDataBody union defines the common rdata types that fit into our 264-byte limit
-typedef union
- {
- mDNSu8 data[StandardAuthRDSize];
- mDNSv4Addr ipv4; // For 'A' record
- domainname name; // For PTR, NS, CNAME, DNAME
- UTF8str255 txt;
- rdataMX mx;
- mDNSv6Addr ipv6; // For 'AAAA' record
- rdataSRV srv;
- rdataOPT opt[2]; // For EDNS0 OPT record; RDataBody may contain multiple variable-length rdataOPT objects packed together
- rdataNSEC nsec;
- } RDataBody;
-
-// The RDataBody2 union is the same as above, except it includes fields for the larger types like soa, rp, px
-typedef union
- {
- mDNSu8 data[StandardAuthRDSize];
- mDNSv4Addr ipv4; // For 'A' record
- domainname name; // For PTR, NS, CNAME, DNAME
- rdataSOA soa; // This is large; not included in the normal RDataBody definition
- UTF8str255 txt;
- rdataMX mx;
- rdataRP rp; // This is large; not included in the normal RDataBody definition
- rdataPX px; // This is large; not included in the normal RDataBody definition
- mDNSv6Addr ipv6; // For 'AAAA' record
- rdataSRV srv;
- rdataOPT opt[2]; // For EDNS0 OPT record; RDataBody may contain multiple variable-length rdataOPT objects packed together
- rdataNSEC nsec;
- } RDataBody2;
-
-typedef struct
- {
- mDNSu16 MaxRDLength; // Amount of storage allocated for rdata (usually sizeof(RDataBody))
- mDNSu16 padding; // So that RDataBody is aligned on 32-bit boundary
- RDataBody u;
- } RData;
-
-// sizeofRDataHeader should be 4 bytes
-#define sizeofRDataHeader (sizeof(RData) - sizeof(RDataBody))
-
-// RData_small is a smaller version of the RData object, used for inline data storage embedded in a CacheRecord_struct
-typedef struct
- {
- mDNSu16 MaxRDLength; // Storage allocated for data (may be greater than InlineCacheRDSize if additional storage follows this object)
- mDNSu16 padding; // So that data is aligned on 32-bit boundary
- mDNSu8 data[InlineCacheRDSize];
- } RData_small;
-
-// Note: Within an mDNSRecordCallback mDNS all API calls are legal except mDNS_Init(), mDNS_Exit(), mDNS_Execute()
-typedef void mDNSRecordCallback(mDNS *const m, AuthRecord *const rr, mStatus result);
-
-// Note:
-// Restrictions: An mDNSRecordUpdateCallback may not make any mDNS API calls.
-// The intent of this callback is to allow the client to free memory, if necessary.
-// The internal data structures of the mDNS code may not be in a state where mDNS API calls may be made safely.
-typedef void mDNSRecordUpdateCallback(mDNS *const m, AuthRecord *const rr, RData *OldRData, mDNSu16 OldRDLen);
-
-// ***************************************************************************
-#if 0
-#pragma mark -
-#pragma mark - NAT Traversal structures and constants
-#endif
-
-#define NATMAP_MAX_RETRY_INTERVAL ((mDNSPlatformOneSecond * 60) * 15) // Max retry interval is 15 minutes
-#define NATMAP_MIN_RETRY_INTERVAL (mDNSPlatformOneSecond * 2) // Min retry interval is 2 seconds
-#define NATMAP_INIT_RETRY (mDNSPlatformOneSecond / 4) // start at 250ms w/ exponential decay
-#define NATMAP_DEFAULT_LEASE (60 * 60 * 2) // 2 hour lease life in seconds
-#define NATMAP_VERS 0
-
-typedef enum
- {
- NATOp_AddrRequest = 0,
- NATOp_MapUDP = 1,
- NATOp_MapTCP = 2,
-
- NATOp_AddrResponse = 0x80 | 0,
- NATOp_MapUDPResponse = 0x80 | 1,
- NATOp_MapTCPResponse = 0x80 | 2,
- } NATOp_t;
-
-enum
- {
- NATErr_None = 0,
- NATErr_Vers = 1,
- NATErr_Refused = 2,
- NATErr_NetFail = 3,
- NATErr_Res = 4,
- NATErr_Opcode = 5
- };
-
-typedef mDNSu16 NATErr_t;
-
-typedef packedstruct
- {
- mDNSu8 vers;
- mDNSu8 opcode;
- } NATAddrRequest;
-
-typedef packedstruct
- {
- mDNSu8 vers;
- mDNSu8 opcode;
- mDNSu16 err;
- mDNSu32 upseconds; // Time since last NAT engine reboot, in seconds
- mDNSv4Addr ExtAddr;
- } NATAddrReply;
-
-typedef packedstruct
- {
- mDNSu8 vers;
- mDNSu8 opcode;
- mDNSOpaque16 unused;
- mDNSIPPort intport;
- mDNSIPPort extport;
- mDNSu32 NATReq_lease;
- } NATPortMapRequest;
-
-typedef packedstruct
- {
- mDNSu8 vers;
- mDNSu8 opcode;
- mDNSu16 err;
- mDNSu32 upseconds; // Time since last NAT engine reboot, in seconds
- mDNSIPPort intport;
- mDNSIPPort extport;
- mDNSu32 NATRep_lease;
- } NATPortMapReply;
-
-typedef enum
- {
- LNTDiscoveryOp = 1,
- LNTExternalAddrOp = 2,
- LNTPortMapOp = 3,
- LNTPortMapDeleteOp = 4
- } LNTOp_t;
-
-#define LNT_MAXBUFSIZE 8192
-typedef struct tcpLNTInfo_struct tcpLNTInfo;
-struct tcpLNTInfo_struct
- {
- tcpLNTInfo *next;
- mDNS *m;
- NATTraversalInfo *parentNATInfo; // pointer back to the parent NATTraversalInfo
- TCPSocket *sock;
- LNTOp_t op; // operation performed using this connection
- mDNSAddr Address; // router address
- mDNSIPPort Port; // router port
- mDNSu8 *Request; // xml request to router
- int requestLen;
- mDNSu8 *Reply; // xml reply from router
- int replyLen;
- unsigned long nread; // number of bytes read so far
- int retries; // number of times we've tried to do this port mapping
- };
-
-typedef void (*NATTraversalClientCallback)(mDNS *m, NATTraversalInfo *n);
-
-// if m->timenow < ExpiryTime then we have an active mapping, and we'll renew halfway to expiry
-// if m->timenow >= ExpiryTime then our mapping has expired, and we're trying to create one
-
-struct NATTraversalInfo_struct
- {
- // Internal state fields. These are used internally by mDNSCore; the client layer needn't be concerned with them.
- NATTraversalInfo *next;
-
- mDNSs32 ExpiryTime; // Time this mapping expires, or zero if no mapping
- mDNSs32 retryInterval; // Current interval, between last packet we sent and the next one
- mDNSs32 retryPortMap; // If Protocol is nonzero, time to send our next mapping packet
- mStatus NewResult; // New error code; will be copied to Result just prior to invoking callback
-
-#ifdef _LEGACY_NAT_TRAVERSAL_
- tcpLNTInfo tcpInfo; // Legacy NAT traversal (UPnP) TCP connection
-#endif
-
- // Result fields: When the callback is invoked these fields contain the answers the client is looking for
- // When the callback is invoked ExternalPort is *usually* set to be the same the same as RequestedPort, except:
- // (a) When we're behind a NAT gateway with port mapping disabled, ExternalPort is reported as zero to
- // indicate that we don't currently have a working mapping (but RequestedPort retains the external port
- // we'd like to get, the next time we meet an accomodating NAT gateway willing to give us one).
- // (b) When we have a routable non-RFC1918 address, we don't *need* a port mapping, so ExternalPort
- // is reported as the same as our InternalPort, since that is effectively our externally-visible port too.
- // Again, RequestedPort retains the external port we'd like to get the next time we find ourself behind a NAT gateway.
- // To improve stability of port mappings, RequestedPort is updated any time we get a successful
- // mapping response from the NAT-PMP or UPnP gateway. For example, if we ask for port 80, and
- // get assigned port 81, then thereafter we'll contine asking for port 81.
- mDNSInterfaceID InterfaceID;
- mDNSv4Addr ExternalAddress; // Initially set to onesIPv4Addr, until first callback
- mDNSIPPort ExternalPort;
- mDNSu32 Lifetime;
- mStatus Result;
-
- // Client API fields: The client must set up these fields *before* making any NAT traversal API calls
- mDNSu8 Protocol; // NATOp_MapUDP or NATOp_MapTCP, or zero if just requesting the external IP address
- mDNSIPPort IntPort; // Client's internal port number (doesn't change)
- mDNSIPPort RequestedPort; // Requested external port; may be updated with actual value assigned by gateway
- mDNSu32 NATLease; // Requested lifetime in seconds (doesn't change)
- NATTraversalClientCallback clientCallback;
- void *clientContext;
- };
-
-enum
- {
- DNSServer_Untested = 0,
- DNSServer_Passed = 1,
- DNSServer_Failed = 2,
- DNSServer_Disabled = 3
- };
-
-enum
- {
- DNSServer_FlagDelete = 1,
- DNSServer_FlagNew = 2
- };
-
-enum
- {
- McastResolver_FlagDelete = 1,
- McastResolver_FlagNew = 2
- };
-
-typedef struct McastResolver
- {
- struct McastResolver *next;
- mDNSInterfaceID interface;
- mDNSu32 flags; // Set when we're planning to delete this from the list
- domainname domain;
- mDNSu32 timeout; // timeout value for questions
- } McastResolver;
-
-typedef struct DNSServer
- {
- struct DNSServer *next;
- mDNSInterfaceID interface; // For specialized uses; we can have DNS servers reachable over specific interfaces
- mDNSAddr addr;
- mDNSIPPort port;
- mDNSOpaque16 testid;
- mDNSu32 flags; // Set when we're planning to delete this from the list
- mDNSu32 teststate; // Have we sent bug-detection query to this server?
- mDNSs32 lasttest; // Time we sent last bug-detection query to this server
- domainname domain; // name->server matching for "split dns"
- mDNSs32 penaltyTime; // amount of time this server is penalized
- mDNSBool scoped; // interface should be matched against question only
- // if scoped is set
- mDNSu32 timeout; // timeout value for questions
- mDNSBool cellIntf; // Resolver from Cellular Interface ?
- } DNSServer;
-
-typedef struct // Size is 36 bytes when compiling for 32-bit; 48 when compiling for 64-bit
- {
- mDNSu8 RecordType; // See enum above
- mDNSu16 rrtype;
- mDNSu16 rrclass;
- mDNSu32 rroriginalttl; // In seconds
- mDNSu16 rdlength; // Size of the raw rdata, in bytes, in the on-the-wire format
- // (In-memory storage may be larger, for structures containing 'holes', like SOA,
- // or smaller, for NSEC where we don't bother storing the nextname field)
- mDNSu16 rdestimate; // Upper bound on on-the-wire size of rdata after name compression
- mDNSu32 namehash; // Name-based (i.e. case-insensitive) hash of name
- mDNSu32 rdatahash; // For rdata containing domain name (e.g. PTR, SRV, CNAME etc.), case-insensitive name hash
- // else, for all other rdata, 32-bit hash of the raw rdata
- // Note: This requirement is important. Various routines like AddAdditionalsToResponseList(),
- // ReconfirmAntecedents(), etc., use rdatahash as a pre-flight check to see
- // whether it's worth doing a full SameDomainName() call. If the rdatahash
- // is not a correct case-insensitive name hash, they'll get false negatives.
-
- // Grouping pointers together at the end of the structure improves the memory layout efficiency
- mDNSInterfaceID InterfaceID; // Set if this RR is specific to one interface
- // For records received off the wire, InterfaceID is *always* set to the receiving interface
- // For our authoritative records, InterfaceID is usually zero, except for those few records
- // that are interface-specific (e.g. address records, especially linklocal addresses)
- const domainname *name;
- RData *rdata; // Pointer to storage for this rdata
- DNSServer *rDNSServer; // Unicast DNS server authoritative for this entry;null for multicast
- } ResourceRecord;
-
-// Unless otherwise noted, states may apply to either independent record registrations or service registrations
-typedef enum
- {
- regState_Zero = 0,
- regState_Pending = 1, // update sent, reply not received
- regState_Registered = 2, // update sent, reply received
- regState_DeregPending = 3, // dereg sent, reply not received
- regState_Unregistered = 4, // not in any list
- regState_Refresh = 5, // outstanding refresh (or target change) message
- regState_NATMap = 6, // establishing NAT port mapping
- regState_UpdatePending = 7, // update in flight as result of mDNS_Update call
- regState_NoTarget = 8, // SRV Record registration pending registration of hostname
- regState_NATError = 9 // unable to complete NAT traversal
- } regState_t;
-
-enum
- {
- Target_Manual = 0,
- Target_AutoHost = 1,
- Target_AutoHostAndNATMAP = 2
- };
-
-typedef enum
- {
- mergeState_Zero = 0,
- mergeState_DontMerge = 1 // Set on fatal error conditions to disable merging
- } mergeState_t;
-
-struct AuthGroup_struct // Header object for a list of AuthRecords with the same name
- {
- AuthGroup *next; // Next AuthGroup object in this hash table bucket
- mDNSu32 namehash; // Name-based (i.e. case insensitive) hash of name
- AuthRecord *members; // List of CacheRecords with this same name
- AuthRecord **rrauth_tail; // Tail end of that list
- domainname *name; // Common name for all AuthRecords in this list
- AuthRecord *NewLocalOnlyRecords;
- // Size to here is 20 bytes when compiling 32-bit; 40 bytes when compiling 64-bit
- mDNSu8 namestorage[InlineCacheGroupNameSize];
- };
-
-#define AUTH_HASH_SLOTS 499
-#define FORALL_AUTHRECORDS(SLOT,AG,AR) \
- for ((SLOT) = 0; (SLOT) < AUTH_HASH_SLOTS; (SLOT)++) \
- for ((AG)=m->rrauth.rrauth_hash[(SLOT)]; (AG); (AG)=(AG)->next) \
- for ((AR) = (AG)->members; (AR); (AR)=(AR)->next)
-
-typedef union AuthEntity_union AuthEntity;
-union AuthEntity_union { AuthEntity *next; AuthGroup ag; };
-typedef struct {
- mDNSu32 rrauth_size; // Total number of available auth entries
- mDNSu32 rrauth_totalused; // Number of auth entries currently occupied
- mDNSu32 rrauth_report;
- mDNSu8 rrauth_lock; // For debugging: Set at times when these lists may not be modified
- AuthEntity *rrauth_free;
- AuthGroup *rrauth_hash[AUTH_HASH_SLOTS];
-}AuthHash;
-
-// AuthRecordAny includes mDNSInterface_Any and interface specific auth records (anything
-// other than P2P or LocalOnly)
-typedef enum
- {
- AuthRecordAny, // registered for *Any, NOT including P2P interfaces
- AuthRecordAnyIncludeP2P, // registered for *Any, including P2P interfaces
- AuthRecordLocalOnly,
- AuthRecordP2P // discovered over D2D/P2P framework
- } AuthRecType;
-
-struct AuthRecord_struct
- {
- // For examples of how to set up this structure for use in mDNS_Register(),
- // see mDNS_AdvertiseInterface() or mDNS_RegisterService().
- // Basically, resrec and persistent metadata need to be set up before calling mDNS_Register().
- // mDNS_SetupResourceRecord() is avaliable as a helper routine to set up most fields to sensible default values for you
-
- AuthRecord *next; // Next in list; first element of structure for efficiency reasons
- // Field Group 1: Common ResourceRecord fields
- ResourceRecord resrec; // 36 bytes when compiling for 32-bit; 48 when compiling for 64-bit
-
- // Field Group 2: Persistent metadata for Authoritative Records
- AuthRecord *Additional1; // Recommended additional record to include in response (e.g. SRV for PTR record)
- AuthRecord *Additional2; // Another additional (e.g. TXT for PTR record)
- AuthRecord *DependentOn; // This record depends on another for its uniqueness checking
- AuthRecord *RRSet; // This unique record is part of an RRSet
- mDNSRecordCallback *RecordCallback; // Callback function to call for state changes, and to free memory asynchronously on deregistration
- void *RecordContext; // Context parameter for the callback function
- mDNSu8 AutoTarget; // Set if the target of this record (PTR, CNAME, SRV, etc.) is our host name
- mDNSu8 AllowRemoteQuery; // Set if we allow hosts not on the local link to query this record
- mDNSu8 ForceMCast; // Set by client to advertise solely via multicast, even for apparently unicast names
-
- OwnerOptData WakeUp; // WakeUp.HMAC.l[0] nonzero indicates that this is a Sleep Proxy record
- mDNSAddr AddressProxy; // For reverse-mapping Sleep Proxy PTR records, address in question
- mDNSs32 TimeRcvd; // In platform time units
- mDNSs32 TimeExpire; // In platform time units
- AuthRecType ARType; // LocalOnly, P2P or Normal ?
-
- // Field Group 3: Transient state for Authoritative Records
- mDNSu8 Acknowledged; // Set if we've given the success callback to the client
- mDNSu8 ProbeCount; // Number of probes remaining before this record is valid (kDNSRecordTypeUnique)
- mDNSu8 AnnounceCount; // Number of announcements remaining (kDNSRecordTypeShared)
- mDNSu8 RequireGoodbye; // Set if this RR has been announced on the wire and will require a goodbye packet
- mDNSu8 AnsweredLocalQ; // Set if this AuthRecord has been delivered to any local question (LocalOnly or mDNSInterface_Any)
- mDNSu8 IncludeInProbe; // Set if this RR is being put into a probe right now
- mDNSu8 ImmedUnicast; // Set if we may send our response directly via unicast to the requester
- mDNSInterfaceID SendNSECNow; // Set if we need to generate associated NSEC data for this rrname
- mDNSInterfaceID ImmedAnswer; // Someone on this interface issued a query we need to answer (all-ones for all interfaces)
-#if MDNS_LOG_ANSWER_SUPPRESSION_TIMES
- mDNSs32 ImmedAnswerMarkTime;
-#endif
- mDNSInterfaceID ImmedAdditional; // Hint that we might want to also send this record, just to be helpful
- mDNSInterfaceID SendRNow; // The interface this query is being sent on right now
- mDNSv4Addr v4Requester; // Recent v4 query for this record, or all-ones if more than one recent query
- mDNSv6Addr v6Requester; // Recent v6 query for this record, or all-ones if more than one recent query
- AuthRecord *NextResponse; // Link to the next element in the chain of responses to generate
- const mDNSu8 *NR_AnswerTo; // Set if this record was selected by virtue of being a direct answer to a question
- AuthRecord *NR_AdditionalTo; // Set if this record was selected by virtue of being additional to another
- mDNSs32 ThisAPInterval; // In platform time units: Current interval for announce/probe
- mDNSs32 LastAPTime; // In platform time units: Last time we sent announcement/probe
- mDNSs32 LastMCTime; // Last time we multicast this record (used to guard against packet-storm attacks)
- mDNSInterfaceID LastMCInterface; // Interface this record was multicast on at the time LastMCTime was recorded
- RData *NewRData; // Set if we are updating this record with new rdata
- mDNSu16 newrdlength; // ... and the length of the new RData
- mDNSRecordUpdateCallback *UpdateCallback;
- mDNSu32 UpdateCredits; // Token-bucket rate limiting of excessive updates
- mDNSs32 NextUpdateCredit; // Time next token is added to bucket
- mDNSs32 UpdateBlocked; // Set if update delaying is in effect
-
- // Field Group 4: Transient uDNS state for Authoritative Records
- regState_t state; // Maybe combine this with resrec.RecordType state? Right now it's ambiguous and confusing.
- // e.g. rr->resrec.RecordType can be kDNSRecordTypeUnregistered,
- // and rr->state can be regState_Unregistered
- // What if we find one of those statements is true and the other false? What does that mean?
- mDNSBool uselease; // dynamic update contains (should contain) lease option
- mDNSs32 expire; // In platform time units: expiration of lease (-1 for static)
- mDNSBool Private; // If zone is private, DNS updates may have to be encrypted to prevent eavesdropping
- mDNSOpaque16 updateid; // Identifier to match update request and response -- also used when transferring records to Sleep Proxy
- const domainname *zone; // the zone that is updated
- ZoneData *nta;
- struct tcpInfo_t *tcp;
- NATTraversalInfo NATinfo;
- mDNSBool SRVChanged; // temporarily deregistered service because its SRV target or port changed
- mergeState_t mState; // Unicast Record Registrations merge state
- mDNSu8 refreshCount; // Number of refreshes to the server
- mStatus updateError; // Record update resulted in Error ?
-
- // uDNS_UpdateRecord support fields
- // Do we really need all these in *addition* to NewRData and newrdlength above?
- void *UpdateContext; // Context parameter for the update callback function
- mDNSu16 OrigRDLen; // previously registered, being deleted
- mDNSu16 InFlightRDLen; // currently being registered
- mDNSu16 QueuedRDLen; // pending operation (re-transmitting if necessary) THEN register the queued update
- RData *OrigRData;
- RData *InFlightRData;
- RData *QueuedRData;
-
- // Field Group 5: Large data objects go at the end
- domainname namestorage;
- RData rdatastorage; // Normally the storage is right here, except for oversized records
- // rdatastorage MUST be the last thing in the structure -- when using oversized AuthRecords, extra bytes
- // are appended after the end of the AuthRecord, logically augmenting the size of the rdatastorage
- // DO NOT ADD ANY MORE FIELDS HERE
- };
-
-// IsLocalDomain alone is not sufficient to determine that a record is mDNS or uDNS. By default domain names within
-// the "local" pseudo-TLD (and within the IPv4 and IPv6 link-local reverse mapping domains) are automatically treated
-// as mDNS records, but it is also possible to force any record (even those not within one of the inherently local
-// domains) to be handled as an mDNS record by setting the ForceMCast flag, or by setting a non-zero InterfaceID.
-// For example, the reverse-mapping PTR record created in AdvertiseInterface sets the ForceMCast flag, since it points to
-// a dot-local hostname, and therefore it would make no sense to register this record with a wide-area Unicast DNS server.
-// The same applies to Sleep Proxy records, which we will answer for when queried via mDNS, but we never want to try
-// to register them with a wide-area Unicast DNS server -- and we probably don't have the required credentials anyway.
-// Currently we have no concept of a wide-area uDNS record scoped to a particular interface, so if the InterfaceID is
-// nonzero we treat this the same as ForceMCast.
-// Note: Question_uDNS(Q) is used in *only* one place -- on entry to mDNS_StartQuery_internal, to decide whether to set TargetQID.
-// Everywhere else in the code, the determination of whether a question is unicast is made by checking to see if TargetQID is nonzero.
-#define AuthRecord_uDNS(R) ((R)->resrec.InterfaceID == mDNSInterface_Any && !(R)->ForceMCast && !IsLocalDomain((R)->resrec.name))
-#define Question_uDNS(Q) ((Q)->InterfaceID == mDNSInterface_Unicast || \
- ((Q)->InterfaceID != mDNSInterface_LocalOnly && (Q)->InterfaceID != mDNSInterface_P2P && !(Q)->ForceMCast && !IsLocalDomain(&(Q)->qname)))
-
-#define RRLocalOnly(rr) ((rr)->ARType == AuthRecordLocalOnly || (rr)->ARType == AuthRecordP2P)
-
-#define RRAny(rr) ((rr)->ARType == AuthRecordAny || (rr)->ARType == AuthRecordAnyIncludeP2P)
-
-// Question (A or AAAA) that is suppressed currently because IPv4 or IPv6 address
-// is not available locally for A or AAAA question respectively
-#define QuerySuppressed(Q) ((Q)->SuppressUnusable && (Q)->SuppressQuery)
-
-#define PrivateQuery(Q) ((Q)->AuthInfo && (Q)->AuthInfo->AutoTunnel)
-
-// Normally we always lookup the cache and /etc/hosts before sending the query on the wire. For single label
-// queries (A and AAAA) that are unqualified (indicated by AppendSearchDomains), we want to append search
-// domains before we try them as such
-#define ApplySearchDomainsFirst(q) ((q)->AppendSearchDomains && (CountLabels(&((q)->qname))) == 1)
-
-// Wrapper struct for Auth Records for higher-level code that cannot use the AuthRecord's ->next pointer field
-typedef struct ARListElem
- {
- struct ARListElem *next;
- AuthRecord ar; // Note: Must be last element of structure, to accomodate oversized AuthRecords
- } ARListElem;
-
-struct CacheGroup_struct // Header object for a list of CacheRecords with the same name
- {
- CacheGroup *next; // Next CacheGroup object in this hash table bucket
- mDNSu32 namehash; // Name-based (i.e. case insensitive) hash of name
- CacheRecord *members; // List of CacheRecords with this same name
- CacheRecord **rrcache_tail; // Tail end of that list
- domainname *name; // Common name for all CacheRecords in this list
- // Size to here is 20 bytes when compiling 32-bit; 40 bytes when compiling 64-bit
- mDNSu8 namestorage[InlineCacheGroupNameSize];
- };
-
-
-struct CacheRecord_struct
- {
- CacheRecord *next; // Next in list; first element of structure for efficiency reasons
- ResourceRecord resrec; // 36 bytes when compiling for 32-bit; 48 when compiling for 64-bit
-
- // Transient state for Cache Records
- CacheRecord *NextInKAList; // Link to the next element in the chain of known answers to send
- mDNSs32 TimeRcvd; // In platform time units
- mDNSs32 DelayDelivery; // Set if we want to defer delivery of this answer to local clients
- mDNSs32 NextRequiredQuery; // In platform time units
- mDNSs32 LastUsed; // In platform time units
- DNSQuestion *CRActiveQuestion; // Points to an active question referencing this answer. Can never point to a NewQuestion.
- mDNSu32 UnansweredQueries; // Number of times we've issued a query for this record without getting an answer
- mDNSs32 LastUnansweredTime; // In platform time units; last time we incremented UnansweredQueries
-#if ENABLE_MULTI_PACKET_QUERY_SNOOPING
- mDNSu32 MPUnansweredQ; // Multi-packet query handling: Number of times we've seen a query for this record
- mDNSs32 MPLastUnansweredQT; // Multi-packet query handling: Last time we incremented MPUnansweredQ
- mDNSu32 MPUnansweredKA; // Multi-packet query handling: Number of times we've seen this record in a KA list
- mDNSBool MPExpectingKA; // Multi-packet query handling: Set when we increment MPUnansweredQ; allows one KA
-#endif
- CacheRecord *NextInCFList; // Set if this is in the list of records we just received with the cache flush bit set
- // Size to here is 76 bytes when compiling 32-bit; 104 bytes when compiling 64-bit
- RData_small smallrdatastorage; // Storage for small records is right here (4 bytes header + 68 bytes data = 72 bytes)
- };
-
-// Storage sufficient to hold either a CacheGroup header or a CacheRecord
-// -- for best efficiency (to avoid wasted unused storage) they should be the same size
-typedef union CacheEntity_union CacheEntity;
-union CacheEntity_union { CacheEntity *next; CacheGroup cg; CacheRecord cr; };
-
-typedef struct
- {
- CacheRecord r;
- mDNSu8 _extradata[MaximumRDSize-InlineCacheRDSize]; // Glue on the necessary number of extra bytes
- domainname namestorage; // Needs to go *after* the extra rdata bytes
- } LargeCacheRecord;
-
-typedef struct HostnameInfo
- {
- struct HostnameInfo *next;
- NATTraversalInfo natinfo;
- domainname fqdn;
- AuthRecord arv4; // registered IPv4 address record
- AuthRecord arv6; // registered IPv6 address record
- mDNSRecordCallback *StatusCallback; // callback to deliver success or error code to client layer
- const void *StatusContext; // Client Context
- } HostnameInfo;
-
-typedef struct ExtraResourceRecord_struct ExtraResourceRecord;
-struct ExtraResourceRecord_struct
- {
- ExtraResourceRecord *next;
- mDNSu32 ClientID; // Opaque ID field to be used by client to map an AddRecord call to a set of Extra records
- AuthRecord r;
- // Note: Add any additional fields *before* the AuthRecord in this structure, not at the end.
- // In some cases clients can allocate larger chunks of memory and set r->rdata->MaxRDLength to indicate
- // that this extra memory is available, which would result in any fields after the AuthRecord getting smashed
- };
-
-// Note: Within an mDNSServiceCallback mDNS all API calls are legal except mDNS_Init(), mDNS_Exit(), mDNS_Execute()
-typedef void mDNSServiceCallback(mDNS *const m, ServiceRecordSet *const sr, mStatus result);
-
-// A ServiceRecordSet has no special meaning to the core code of the Multicast DNS protocol engine;
-// it is just a convenience structure to group together the records that make up a standard service
-// registration so that they can be allocted and deallocted together as a single memory object.
-// It contains its own ServiceCallback+ServiceContext to report aggregate results up to the next layer of software above.
-// It also contains:
-// * the basic PTR/SRV/TXT triplet used to represent any DNS-SD service
-// * the "_services" PTR record for service enumeration
-// * the optional list of SubType PTR records
-// * the optional list of additional records attached to the service set (e.g. iChat pictures)
-
-struct ServiceRecordSet_struct
- {
- // These internal state fields are used internally by mDNSCore; the client layer needn't be concerned with them.
- // No fields need to be set up by the client prior to calling mDNS_RegisterService();
- // all required data is passed as parameters to that function.
- mDNSServiceCallback *ServiceCallback;
- void *ServiceContext;
- mDNSBool Conflict; // Set if this record set was forcibly deregistered because of a conflict
-
- ExtraResourceRecord *Extras; // Optional list of extra AuthRecords attached to this service registration
- mDNSu32 NumSubTypes;
- AuthRecord *SubTypes;
- AuthRecord RR_ADV; // e.g. _services._dns-sd._udp.local. PTR _printer._tcp.local.
- AuthRecord RR_PTR; // e.g. _printer._tcp.local. PTR Name._printer._tcp.local.
- AuthRecord RR_SRV; // e.g. Name._printer._tcp.local. SRV 0 0 port target
- AuthRecord RR_TXT; // e.g. Name._printer._tcp.local. TXT PrintQueueName
- // Don't add any fields after AuthRecord RR_TXT.
- // This is where the implicit extra space goes if we allocate a ServiceRecordSet containing an oversized RR_TXT record
- };
-
-// ***************************************************************************
-#if 0
-#pragma mark -
-#pragma mark - Question structures
-#endif
-
-// We record the last eight instances of each duplicate query
-// This gives us v4/v6 on each of Ethernet, AirPort and Firewire, and two free slots "for future expansion"
-// If the host has more active interfaces that this it is not fatal -- duplicate question suppression will degrade gracefully.
-// Since we will still remember the last eight, the busiest interfaces will still get the effective duplicate question suppression.
-#define DupSuppressInfoSize 8
-
-typedef struct
- {
- mDNSs32 Time;
- mDNSInterfaceID InterfaceID;
- mDNSs32 Type; // v4 or v6?
- } DupSuppressInfo;
-
-typedef enum
- {
- LLQ_InitialRequest = 1,
- LLQ_SecondaryRequest = 2,
- LLQ_Established = 3,
- LLQ_Poll = 4
- } LLQ_State;
-
-// LLQ constants
-#define kLLQ_Vers 1
-#define kLLQ_DefLease 7200 // 2 hours
-#define kLLQ_MAX_TRIES 3 // retry an operation 3 times max
-#define kLLQ_INIT_RESEND 2 // resend an un-ack'd packet after 2 seconds, then double for each additional
-// LLQ Operation Codes
-#define kLLQOp_Setup 1
-#define kLLQOp_Refresh 2
-#define kLLQOp_Event 3
-
-// LLQ Errror Codes
-enum
- {
- LLQErr_NoError = 0,
- LLQErr_ServFull = 1,
- LLQErr_Static = 2,
- LLQErr_FormErr = 3,
- LLQErr_NoSuchLLQ = 4,
- LLQErr_BadVers = 5,
- LLQErr_UnknownErr = 6
- };
-
-enum { NoAnswer_Normal = 0, NoAnswer_Suspended = 1, NoAnswer_Fail = 2 };
-
-#define HMAC_LEN 64
-#define HMAC_IPAD 0x36
-#define HMAC_OPAD 0x5c
-#define MD5_LEN 16
-
-#define AutoTunnelUnregistered(X) ( \
- (X)->AutoTunnelHostRecord.resrec.RecordType == kDNSRecordTypeUnregistered && \
- (X)->AutoTunnelDeviceInfo.resrec.RecordType == kDNSRecordTypeUnregistered && \
- (X)->AutoTunnelService. resrec.RecordType == kDNSRecordTypeUnregistered && \
- (X)->AutoTunnel6Record. resrec.RecordType == kDNSRecordTypeUnregistered )
-
-// Internal data structure to maintain authentication information
-typedef struct DomainAuthInfo
- {
- struct DomainAuthInfo *next;
- mDNSs32 deltime; // If we're planning to delete this DomainAuthInfo, the time we want it deleted
- const char* AutoTunnel; // If NULL, this is not an AutoTunnel DAI. Otherwise, this is prepended to the IPSec identifier
- AuthRecord AutoTunnelHostRecord; // User-visible hostname; used as SRV target for AutoTunnel services
- AuthRecord AutoTunnelTarget; // Opaque hostname of tunnel endpoint; used as SRV target for AutoTunnelService record
- AuthRecord AutoTunnelDeviceInfo; // Device info of tunnel endpoint
- AuthRecord AutoTunnelService; // Service record (possibly NAT-Mapped) of IKE daemon implementing tunnel endpoint
- AuthRecord AutoTunnel6Record; // AutoTunnel AAAA Record obtained from Connectivityd
- NATTraversalInfo AutoTunnelNAT;
- domainname domain;
- domainname keyname;
- domainname hostname;
- mDNSIPPort port;
- char b64keydata[32];
- mDNSu8 keydata_ipad[HMAC_LEN]; // padded key for inner hash rounds
- mDNSu8 keydata_opad[HMAC_LEN]; // padded key for outer hash rounds
- } DomainAuthInfo;
-
-// Note: Within an mDNSQuestionCallback mDNS all API calls are legal except mDNS_Init(), mDNS_Exit(), mDNS_Execute()
-typedef enum { QC_rmv = 0, QC_add = 1, QC_addnocache = 2 } QC_result;
-typedef void mDNSQuestionCallback(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord);
-
-#define NextQSendTime(Q) ((Q)->LastQTime + (Q)->ThisQInterval)
-#define ActiveQuestion(Q) ((Q)->ThisQInterval > 0 && !(Q)->DuplicateOf)
-#define TimeToSendThisQuestion(Q,time) (ActiveQuestion(Q) && (time) - NextQSendTime(Q) >= 0)
-
-struct DNSQuestion_struct
- {
- // Internal state fields. These are used internally by mDNSCore; the client layer needn't be concerned with them.
- DNSQuestion *next;
- mDNSu32 qnamehash;
- mDNSs32 DelayAnswering; // Set if we want to defer answering this question until the cache settles
- mDNSs32 LastQTime; // Last scheduled transmission of this Q on *all* applicable interfaces
- mDNSs32 ThisQInterval; // LastQTime + ThisQInterval is the next scheduled transmission of this Q
- // ThisQInterval > 0 for an active question;
- // ThisQInterval = 0 for a suspended question that's still in the list
- // ThisQInterval = -1 for a cancelled question (should not still be in list)
- mDNSs32 ExpectUnicastResp;// Set when we send a query with the kDNSQClass_UnicastResponse bit set
- mDNSs32 LastAnswerPktNum; // The sequence number of the last response packet containing an answer to this Q
- mDNSu32 RecentAnswerPkts; // Number of answers since the last time we sent this query
- mDNSu32 CurrentAnswers; // Number of records currently in the cache that answer this question
- mDNSu32 LargeAnswers; // Number of answers with rdata > 1024 bytes
- mDNSu32 UniqueAnswers; // Number of answers received with kDNSClass_UniqueRRSet bit set
- mDNSInterfaceID FlappingInterface1;// Set when an interface goes away, to flag if remove events are delivered for this Q
- mDNSInterfaceID FlappingInterface2;// Set when an interface goes away, to flag if remove events are delivered for this Q
- DomainAuthInfo *AuthInfo; // Non-NULL if query is currently being done using Private DNS
- DNSQuestion *DuplicateOf;
- DNSQuestion *NextInDQList;
- DupSuppressInfo DupSuppress[DupSuppressInfoSize];
- mDNSInterfaceID SendQNow; // The interface this query is being sent on right now
- mDNSBool SendOnAll; // Set if we're sending this question on all active interfaces
- mDNSu32 RequestUnicast; // Non-zero if we want to send query with kDNSQClass_UnicastResponse bit set
- mDNSs32 LastQTxTime; // Last time this Q was sent on one (but not necessarily all) interfaces
- mDNSu32 CNAMEReferrals; // Count of how many CNAME redirections we've done
- mDNSBool SuppressQuery; // This query should be suppressed and not sent on the wire
- mDNSu8 LOAddressAnswers; // Number of answers from the local only auth records that are
- // answering A, AAAA and CNAME (/etc/hosts)
- mDNSu8 WakeOnResolveCount; // Number of wakes that should be sent on resolve
- mDNSs32 StopTime; // Time this question should be stopped by giving them a negative answer
-
- // Wide Area fields. These are used internally by the uDNS core
- UDPSocket *LocalSocket;
- mDNSBool deliverAddEvents; // Change in DNSSserver requiring to deliver ADD events
- DNSServer *qDNSServer; // Caching server for this query (in the absence of an SRV saying otherwise)
- mDNSOpaque64 validDNSServers; // Valid DNSServers for this question
- mDNSu16 noServerResponse; // At least one server did not respond.
- mDNSu16 triedAllServersOnce; // Tried all DNS servers once
- mDNSu8 unansweredQueries;// The number of unanswered queries to this server
-
- ZoneData *nta; // Used for getting zone data for private or LLQ query
- mDNSAddr servAddr; // Address and port learned from _dns-llq, _dns-llq-tls or _dns-query-tls SRV query
- mDNSIPPort servPort;
- struct tcpInfo_t *tcp;
- mDNSIPPort tcpSrcPort; // Local Port TCP packet received on;need this as tcp struct is disposed
- // by tcpCallback before calling into mDNSCoreReceive
- mDNSu8 NoAnswer; // Set if we want to suppress answers until tunnel setup has completed
-
- // LLQ-specific fields. These fields are only meaningful when LongLived flag is set
- LLQ_State state;
- mDNSu32 ReqLease; // seconds (relative)
- mDNSs32 expire; // ticks (absolute)
- mDNSs16 ntries; // for UDP: the number of packets sent for this LLQ state
- // for TCP: there is some ambiguity in the use of this variable, but in general, it is
- // the number of TCP/TLS connection attempts for this LLQ state, or
- // the number of packets sent for this TCP/TLS connection
- mDNSOpaque64 id;
-
- // Client API fields: The client must set up these fields *before* calling mDNS_StartQuery()
- mDNSInterfaceID InterfaceID; // Non-zero if you want to issue queries only on a single specific IP interface
- mDNSAddr Target; // Non-zero if you want to direct queries to a specific unicast target address
- mDNSIPPort TargetPort; // Must be set if Target is set
- mDNSOpaque16 TargetQID; // Must be set if Target is set
- domainname qname;
- mDNSu16 qtype;
- mDNSu16 qclass;
- mDNSBool LongLived; // Set by client for calls to mDNS_StartQuery to indicate LLQs to unicast layer.
- mDNSBool ExpectUnique; // Set by client if it's expecting unique RR(s) for this question, not shared RRs
- mDNSBool ForceMCast; // Set by client to force mDNS query, even for apparently uDNS names
- mDNSBool ReturnIntermed; // Set by client to request callbacks for intermediate CNAME/NXDOMAIN results
- mDNSBool SuppressUnusable; // Set by client to suppress unusable queries to be sent on the wire
- mDNSBool RetryWithSearchDomains; // Retry with search domains if there is no entry in the cache or AuthRecords
- mDNSu8 TimeoutQuestion; // Timeout this question if there is no reply in configured time
- mDNSu8 WakeOnResolve; // Send wakeup on resolve
- mDNSs8 SearchListIndex; // Index into SearchList; Used by the client layer but not touched by core
- mDNSs8 AppendSearchDomains; // Search domains can be appended for this query
- mDNSs8 AppendLocalSearchDomains; // Search domains ending in .local can be appended for this query
- domainname *qnameOrig; // Copy of the original question name if it is not fully qualified
- mDNSQuestionCallback *QuestionCallback;
- void *QuestionContext;
- };
-
-typedef struct
- {
- // Client API fields: The client must set up name and InterfaceID *before* calling mDNS_StartResolveService()
- // When the callback is invoked, ip, port, TXTlen and TXTinfo will have been filled in with the results learned from the network.
- domainname name;
- mDNSInterfaceID InterfaceID; // ID of the interface the response was received on
- mDNSAddr ip; // Remote (destination) IP address where this service can be accessed
- mDNSIPPort port; // Port where this service can be accessed
- mDNSu16 TXTlen;
- mDNSu8 TXTinfo[2048]; // Additional demultiplexing information (e.g. LPR queue name)
- } ServiceInfo;
-
-// Note: Within an mDNSServiceInfoQueryCallback mDNS all API calls are legal except mDNS_Init(), mDNS_Exit(), mDNS_Execute()
-typedef struct ServiceInfoQuery_struct ServiceInfoQuery;
-typedef void mDNSServiceInfoQueryCallback(mDNS *const m, ServiceInfoQuery *query);
-struct ServiceInfoQuery_struct
- {
- // Internal state fields. These are used internally by mDNSCore; the client layer needn't be concerned with them.
- // No fields need to be set up by the client prior to calling mDNS_StartResolveService();
- // all required data is passed as parameters to that function.
- // The ServiceInfoQuery structure memory is working storage for mDNSCore to discover the requested information
- // and place it in the ServiceInfo structure. After the client has called mDNS_StopResolveService(), it may
- // dispose of the ServiceInfoQuery structure while retaining the results in the ServiceInfo structure.
- DNSQuestion qSRV;
- DNSQuestion qTXT;
- DNSQuestion qAv4;
- DNSQuestion qAv6;
- mDNSu8 GotSRV;
- mDNSu8 GotTXT;
- mDNSu8 GotADD;
- mDNSu32 Answers;
- ServiceInfo *info;
- mDNSServiceInfoQueryCallback *ServiceInfoQueryCallback;
- void *ServiceInfoQueryContext;
- };
-
-typedef enum { ZoneServiceUpdate, ZoneServiceQuery, ZoneServiceLLQ } ZoneService;
-
-typedef void ZoneDataCallback(mDNS *const m, mStatus err, const ZoneData *result);
-
-struct ZoneData_struct
- {
- domainname ChildName; // Name for which we're trying to find the responsible server
- ZoneService ZoneService; // Which service we're seeking for this zone (update, query, or LLQ)
- domainname *CurrentSOA; // Points to somewhere within ChildName
- domainname ZoneName; // Discovered result: Left-hand-side of SOA record
- mDNSu16 ZoneClass; // Discovered result: DNS Class from SOA record
- domainname Host; // Discovered result: Target host from SRV record
- mDNSIPPort Port; // Discovered result: Update port, query port, or LLQ port from SRV record
- mDNSAddr Addr; // Discovered result: Address of Target host from SRV record
- mDNSBool ZonePrivate; // Discovered result: Does zone require encrypted queries?
- ZoneDataCallback *ZoneDataCallback; // Caller-specified function to be called upon completion
- void *ZoneDataContext;
- DNSQuestion question; // Storage for any active question
- };
-
-extern ZoneData *StartGetZoneData(mDNS *const m, const domainname *const name, const ZoneService target, ZoneDataCallback callback, void *callbackInfo);
-extern void CancelGetZoneData(mDNS *const m, ZoneData *nta);
-extern mDNSBool IsGetZoneDataQuestion(DNSQuestion *q);
-
-typedef struct DNameListElem
- {
- struct DNameListElem *next;
- mDNSu32 uid;
- domainname name;
- } DNameListElem;
-
-#if APPLE_OSX_mDNSResponder
-// Different states that we go through locating the peer
-#define TC_STATE_AAAA_PEER 0x000000001 /* Peer's BTMM IPv6 address */
-#define TC_STATE_AAAA_PEER_RELAY 0x000000002 /* Peer's IPv6 Relay address */
-#define TC_STATE_SRV_PEER 0x000000003 /* Peer's SRV Record corresponding to IPv4 address */
-#define TC_STATE_ADDR_PEER 0x000000004 /* Peer's IPv4 address */
-
-typedef struct ClientTunnel
- {
- struct ClientTunnel *next;
- const char *prefix;
- domainname dstname;
- mDNSBool MarkedForDeletion;
- mDNSv6Addr loc_inner;
- mDNSv4Addr loc_outer;
- mDNSv6Addr loc_outer6;
- mDNSv6Addr rmt_inner;
- mDNSv4Addr rmt_outer;
- mDNSv6Addr rmt_outer6;
- mDNSIPPort rmt_outer_port;
- mDNSu16 tc_state;
- DNSQuestion q;
- } ClientTunnel;
-#endif
-
-// ***************************************************************************
-#if 0
-#pragma mark -
-#pragma mark - NetworkInterfaceInfo_struct
-#endif
-
-typedef struct NetworkInterfaceInfo_struct NetworkInterfaceInfo;
-
-// A NetworkInterfaceInfo_struct serves two purposes:
-// 1. It holds the address, PTR and HINFO records to advertise a given IP address on a given physical interface
-// 2. It tells mDNSCore which physical interfaces are available; each physical interface has its own unique InterfaceID.
-// Since there may be multiple IP addresses on a single physical interface,
-// there may be multiple NetworkInterfaceInfo_structs with the same InterfaceID.
-// In this case, to avoid sending the same packet n times, when there's more than one
-// struct with the same InterfaceID, mDNSCore picks one member of the set to be the
-// active representative of the set; all others have the 'InterfaceActive' flag unset.
-
-struct NetworkInterfaceInfo_struct
- {
- // Internal state fields. These are used internally by mDNSCore; the client layer needn't be concerned with them.
- NetworkInterfaceInfo *next;
-
- mDNSu8 InterfaceActive; // Set if interface is sending & receiving packets (see comment above)
- mDNSu8 IPv4Available; // If InterfaceActive, set if v4 available on this InterfaceID
- mDNSu8 IPv6Available; // If InterfaceActive, set if v6 available on this InterfaceID
-
- DNSQuestion NetWakeBrowse;
- DNSQuestion NetWakeResolve[3]; // For fault-tolerance, we try up to three Sleep Proxies
- mDNSAddr SPSAddr[3];
- mDNSIPPort SPSPort[3];
- mDNSs32 NextSPSAttempt; // -1 if we're not currently attempting to register with any Sleep Proxy
- mDNSs32 NextSPSAttemptTime;
-
- // Standard AuthRecords that every Responder host should have (one per active IP address)
- AuthRecord RR_A; // 'A' or 'AAAA' (address) record for our ".local" name
- AuthRecord RR_PTR; // PTR (reverse lookup) record
- AuthRecord RR_HINFO;
-
- // Client API fields: The client must set up these fields *before* calling mDNS_RegisterInterface()
- mDNSInterfaceID InterfaceID; // Identifies physical interface; MUST NOT be 0, -1, or -2
- mDNSAddr ip; // The IPv4 or IPv6 address to advertise
- mDNSAddr mask;
- mDNSEthAddr MAC;
- char ifname[64]; // Windows uses a GUID string for the interface name, which doesn't fit in 16 bytes
- mDNSu8 Advertise; // False if you are only searching on this interface
- mDNSu8 McastTxRx; // Send/Receive multicast on this { InterfaceID, address family } ?
- mDNSu8 NetWake; // Set if Wake-On-Magic-Packet is enabled on this interface
- mDNSu8 Loopback; // Set if this is the loopback interface
- };
-
-#define SLE_DELETE 0x00000001
-#define SLE_WAB_QUERY_STARTED 0x00000002
-
-typedef struct SearchListElem
- {
- struct SearchListElem *next;
- domainname domain;
- int flag;
- mDNSInterfaceID InterfaceID;
- DNSQuestion BrowseQ;
- DNSQuestion DefBrowseQ;
- DNSQuestion AutomaticBrowseQ;
- DNSQuestion RegisterQ;
- DNSQuestion DefRegisterQ;
- int numCfAnswers;
- ARListElem *AuthRecs;
- } SearchListElem;
-
-// For domain enumeration and automatic browsing
-// This is the user's DNS search list.
-// In each of these domains we search for our special pointer records (lb._dns-sd._udp.<domain>, etc.)
-// to discover recommended domains for domain enumeration (browse, default browse, registration,
-// default registration) and possibly one or more recommended automatic browsing domains.
-extern SearchListElem *SearchList; // This really ought to be part of mDNS_struct -- SC
-
-// ***************************************************************************
-#if 0
-#pragma mark -
-#pragma mark - Main mDNS object, used to hold all the mDNS state
-#endif
-
-typedef void mDNSCallback(mDNS *const m, mStatus result);
-
-#define CACHE_HASH_SLOTS 499
-
-enum // Bit flags -- i.e. values should be 1, 2, 4, 8, etc.
- {
- mDNS_KnownBug_LimitedIPv6 = 1,
- mDNS_KnownBug_LossySyslog = 2 // <rdar://problem/6561888>
- };
-
-enum
- {
- SleepState_Awake = 0,
- SleepState_Transferring = 1,
- SleepState_Sleeping = 2
- };
-
-struct mDNS_struct
- {
- // Internal state fields. These hold the main internal state of mDNSCore;
- // the client layer needn't be concerned with them.
- // No fields need to be set up by the client prior to calling mDNS_Init();
- // all required data is passed as parameters to that function.
-
- mDNS_PlatformSupport *p; // Pointer to platform-specific data of indeterminite size
- mDNSu32 KnownBugs;
- mDNSBool CanReceiveUnicastOn5353;
- mDNSBool AdvertiseLocalAddresses;
- mDNSBool DivertMulticastAdvertisements; // from interfaces that do not advertise local addresses to local-only
- mStatus mDNSPlatformStatus;
- mDNSIPPort UnicastPort4;
- mDNSIPPort UnicastPort6;
- mDNSEthAddr PrimaryMAC; // Used as unique host ID
- mDNSCallback *MainCallback;
- void *MainContext;
-
- // For debugging: To catch and report locking failures
- mDNSu32 mDNS_busy; // Incremented between mDNS_Lock/mDNS_Unlock section
- mDNSu32 mDNS_reentrancy; // Incremented when calling a client callback
- mDNSu8 lock_rrcache; // For debugging: Set at times when these lists may not be modified
- mDNSu8 lock_Questions;
- mDNSu8 lock_Records;
-#ifndef MaxMsg
- #define MaxMsg 160
-#endif
- char MsgBuffer[MaxMsg]; // Temp storage used while building error log messages
-
- // Task Scheduling variables
- mDNSs32 timenow_adjust; // Correction applied if we ever discover time went backwards
- mDNSs32 timenow; // The time that this particular activation of the mDNS code started
- mDNSs32 timenow_last; // The time the last time we ran
- mDNSs32 NextScheduledEvent; // Derived from values below
- mDNSs32 ShutdownTime; // Set when we're shutting down; allows us to skip some unnecessary steps
- mDNSs32 SuppressSending; // Don't send local-link mDNS packets during this time
- mDNSs32 NextCacheCheck; // Next time to refresh cache record before it expires
- mDNSs32 NextScheduledQuery; // Next time to send query in its exponential backoff sequence
- mDNSs32 NextScheduledProbe; // Next time to probe for new authoritative record
- mDNSs32 NextScheduledResponse; // Next time to send authoritative record(s) in responses
- mDNSs32 NextScheduledNATOp; // Next time to send NAT-traversal packets
- mDNSs32 NextScheduledSPS; // Next time to purge expiring Sleep Proxy records
- mDNSs32 RandomQueryDelay; // For de-synchronization of query packets on the wire
- mDNSu32 RandomReconfirmDelay; // For de-synchronization of reconfirmation queries on the wire
- mDNSs32 PktNum; // Unique sequence number assigned to each received packet
- mDNSu8 LocalRemoveEvents; // Set if we may need to deliver remove events for local-only questions and/or local-only records
- mDNSu8 SleepState; // Set if we're sleeping
- mDNSu8 SleepSeqNum; // "Epoch number" of our current period of wakefulness
- mDNSu8 SystemWakeOnLANEnabled; // Set if we want to register with a Sleep Proxy before going to sleep
- mDNSu8 SentSleepProxyRegistration;// Set if we registered (or tried to register) with a Sleep Proxy
- mDNSu8 SystemSleepOnlyIfWakeOnLAN;// Set if we may only sleep if we managed to register with a Sleep Proxy
- mDNSs32 AnnounceOwner; // After waking from sleep, include OWNER option in packets until this time
- mDNSs32 DelaySleep; // To inhibit re-sleeping too quickly right after wake
- mDNSs32 SleepLimit; // Time window to allow deregistrations, etc.,
- // during which underying platform layer should inhibit system sleep
- mDNSs32 NextScheduledSPRetry; // Time next sleep proxy registration action is required.
- // Only valid if SleepLimit is nonzero and DelaySleep is zero.
-
- mDNSs32 NextScheduledStopTime; // Next time to stop a question
-
- // These fields only required for mDNS Searcher...
- DNSQuestion *Questions; // List of all registered questions, active and inactive
- DNSQuestion *NewQuestions; // Fresh questions not yet answered from cache
- DNSQuestion *CurrentQuestion; // Next question about to be examined in AnswerLocalQuestions()
- DNSQuestion *LocalOnlyQuestions; // Questions with InterfaceID set to mDNSInterface_LocalOnly or mDNSInterface_P2P
- DNSQuestion *NewLocalOnlyQuestions; // Fresh local-only or P2P questions not yet answered
- DNSQuestion *RestartQuestion; // Questions that are being restarted (stop followed by start)
- mDNSu32 rrcache_size; // Total number of available cache entries
- mDNSu32 rrcache_totalused; // Number of cache entries currently occupied
- mDNSu32 rrcache_active; // Number of cache entries currently occupied by records that answer active questions
- mDNSu32 rrcache_report;
- CacheEntity *rrcache_free;
- CacheGroup *rrcache_hash[CACHE_HASH_SLOTS];
- mDNSs32 rrcache_nextcheck[CACHE_HASH_SLOTS];
-
- AuthHash rrauth;
-
- // Fields below only required for mDNS Responder...
- domainlabel nicelabel; // Rich text label encoded using canonically precomposed UTF-8
- domainlabel hostlabel; // Conforms to RFC 1034 "letter-digit-hyphen" ARPANET host name rules
- domainname MulticastHostname; // Fully Qualified "dot-local" Host Name, e.g. "Foo.local."
- UTF8str255 HIHardware;
- UTF8str255 HISoftware;
- AuthRecord DeviceInfo;
- AuthRecord *ResourceRecords;
- AuthRecord *DuplicateRecords; // Records currently 'on hold' because they are duplicates of existing records
- AuthRecord *NewLocalRecords; // Fresh AuthRecords (public) not yet delivered to our local-only questions
- AuthRecord *CurrentRecord; // Next AuthRecord about to be examined
- mDNSBool NewLocalOnlyRecords; // Fresh AuthRecords (local only) not yet delivered to our local questions
- NetworkInterfaceInfo *HostInterfaces;
- mDNSs32 ProbeFailTime;
- mDNSu32 NumFailedProbes;
- mDNSs32 SuppressProbes;
-
- // Unicast-specific data
- mDNSs32 NextuDNSEvent; // uDNS next event
- mDNSs32 NextSRVUpdate; // Time to perform delayed update
-
- DNSServer *DNSServers; // list of DNS servers
- McastResolver *McastResolvers; // list of Mcast Resolvers
-
- mDNSAddr Router;
- mDNSAddr AdvertisedV4; // IPv4 address pointed to by hostname
- mDNSAddr AdvertisedV6; // IPv6 address pointed to by hostname
-
- DomainAuthInfo *AuthInfoList; // list of domains requiring authentication for updates
-
- DNSQuestion ReverseMap; // Reverse-map query to find static hostname for service target
- DNSQuestion AutomaticBrowseDomainQ;
- domainname StaticHostname; // Current answer to reverse-map query
- domainname FQDN;
- HostnameInfo *Hostnames; // List of registered hostnames + hostname metadata
- mDNSv6Addr AutoTunnelHostAddr; // IPv6 address advertised for AutoTunnel services on this machine
- mDNSBool AutoTunnelHostAddrActive;
- // AutoTunnel Relay address has two distinct uses
- // AutoTunnelRelayAddrIn: If non-zero, it means that this host can be reached (inbound connection) through the relay
- // AutoTunnelRelayAddrOut: If non-zero, it means that this host can use the relay to reach (outbound connection) the
- // other hosts through the relay
- mDNSv6Addr AutoTunnelRelayAddrIn;
- mDNSv6Addr AutoTunnelRelayAddrOut;
- domainlabel AutoTunnelLabel; // Used to construct hostname for *IPv4* address of tunnel endpoints
-
- mDNSBool StartWABQueries; // Start WAB queries for the purpose of domain enumeration
- mDNSBool RegisterAutoTunnel6;
-
- // NAT-Traversal fields
- NATTraversalInfo LLQNAT; // Single shared NAT Traversal to receive inbound LLQ notifications
- NATTraversalInfo *NATTraversals;
- NATTraversalInfo *CurrentNATTraversal;
- mDNSs32 retryIntervalGetAddr; // delta between time sent and retry
- mDNSs32 retryGetAddr; // absolute time when we retry
- mDNSv4Addr ExternalAddress;
-
- UDPSocket *NATMcastRecvskt; // For receiving NAT-PMP AddrReply multicasts from router on port 5350
- mDNSu32 LastNATupseconds; // NAT engine uptime in seconds, from most recent NAT packet
- mDNSs32 LastNATReplyLocalTime; // Local time in ticks when most recent NAT packet was received
- mDNSu16 LastNATMapResultCode; // Most recent error code for mappings
-
- tcpLNTInfo tcpAddrInfo; // legacy NAT traversal TCP connection info for external address
- tcpLNTInfo tcpDeviceInfo; // legacy NAT traversal TCP connection info for device info
- tcpLNTInfo *tcpInfoUnmapList; // list of pending unmap requests
- mDNSInterfaceID UPnPInterfaceID;
- UDPSocket *SSDPSocket; // For SSDP request/response
- mDNSBool SSDPWANPPPConnection; // whether we should send the SSDP query for WANIPConnection or WANPPPConnection
- mDNSIPPort UPnPRouterPort; // port we send discovery messages to
- mDNSIPPort UPnPSOAPPort; // port we send SOAP messages to
- mDNSu8 *UPnPRouterURL; // router's URL string
- mDNSBool UPnPWANPPPConnection; // whether we're using WANIPConnection or WANPPPConnection
- mDNSu8 *UPnPSOAPURL; // router's SOAP control URL string
- mDNSu8 *UPnPRouterAddressString; // holds both the router's address and port
- mDNSu8 *UPnPSOAPAddressString; // holds both address and port for SOAP messages
-
- // Sleep Proxy Server fields
- mDNSu8 SPSType; // 0 = off, 10-99 encodes desirability metric
- mDNSu8 SPSPortability; // 10-99
- mDNSu8 SPSMarginalPower; // 10-99
- mDNSu8 SPSTotalPower; // 10-99
- mDNSu8 SPSState; // 0 = off, 1 = running, 2 = shutting down, 3 = suspended during sleep
- mDNSInterfaceID SPSProxyListChanged;
- UDPSocket *SPSSocket;
- ServiceRecordSet SPSRecords;
- mDNSQuestionCallback *SPSBrowseCallback; // So the platform layer can do something useful with SPS browse results
- int ProxyRecords; // Total number of records we're holding as proxy
- #define MAX_PROXY_RECORDS 10000 /* DOS protection: 400 machines at 25 records each */
-
-#if APPLE_OSX_mDNSResponder
- ClientTunnel *TunnelClients;
- uuid_t asl_uuid; // uuid for ASL logging
- void *WCF;
-#endif
-
- // Fixed storage, to avoid creating large objects on the stack
- // The imsg is declared as a union with a pointer type to enforce CPU-appropriate alignment
- union { DNSMessage m; void *p; } imsg; // Incoming message received from wire
- DNSMessage omsg; // Outgoing message we're building
- LargeCacheRecord rec; // Resource Record extracted from received message
- };
-
-#define FORALL_CACHERECORDS(SLOT,CG,CR) \
- for ((SLOT) = 0; (SLOT) < CACHE_HASH_SLOTS; (SLOT)++) \
- for ((CG)=m->rrcache_hash[(SLOT)]; (CG); (CG)=(CG)->next) \
- for ((CR) = (CG)->members; (CR); (CR)=(CR)->next)
-
-// ***************************************************************************
-#if 0
-#pragma mark -
-#pragma mark - Useful Static Constants
-#endif
-
-extern const mDNSInterfaceID mDNSInterface_Any; // Zero
-extern const mDNSInterfaceID mDNSInterface_LocalOnly; // Special value
-extern const mDNSInterfaceID mDNSInterface_Unicast; // Special value
-extern const mDNSInterfaceID mDNSInterfaceMark; // Special value
-extern const mDNSInterfaceID mDNSInterface_P2P; // Special value
-
-extern const mDNSIPPort DiscardPort;
-extern const mDNSIPPort SSHPort;
-extern const mDNSIPPort UnicastDNSPort;
-extern const mDNSIPPort SSDPPort;
-extern const mDNSIPPort IPSECPort;
-extern const mDNSIPPort NSIPCPort;
-extern const mDNSIPPort NATPMPAnnouncementPort;
-extern const mDNSIPPort NATPMPPort;
-extern const mDNSIPPort DNSEXTPort;
-extern const mDNSIPPort MulticastDNSPort;
-extern const mDNSIPPort LoopbackIPCPort;
-extern const mDNSIPPort PrivateDNSPort;
-
-extern const OwnerOptData zeroOwner;
-
-extern const mDNSIPPort zeroIPPort;
-extern const mDNSv4Addr zerov4Addr;
-extern const mDNSv6Addr zerov6Addr;
-extern const mDNSEthAddr zeroEthAddr;
-extern const mDNSv4Addr onesIPv4Addr;
-extern const mDNSv6Addr onesIPv6Addr;
-extern const mDNSEthAddr onesEthAddr;
-extern const mDNSAddr zeroAddr;
-
-extern const mDNSv4Addr AllDNSAdminGroup;
-extern const mDNSv4Addr AllHosts_v4;
-extern const mDNSv6Addr AllHosts_v6;
-extern const mDNSv6Addr NDP_prefix;
-extern const mDNSEthAddr AllHosts_v6_Eth;
-extern const mDNSAddr AllDNSLinkGroup_v4;
-extern const mDNSAddr AllDNSLinkGroup_v6;
-
-extern const mDNSOpaque16 zeroID;
-extern const mDNSOpaque16 onesID;
-extern const mDNSOpaque16 QueryFlags;
-extern const mDNSOpaque16 uQueryFlags;
-extern const mDNSOpaque16 ResponseFlags;
-extern const mDNSOpaque16 UpdateReqFlags;
-extern const mDNSOpaque16 UpdateRespFlags;
-
-extern const mDNSOpaque64 zeroOpaque64;
-
-extern mDNSBool StrictUnicastOrdering;
-extern mDNSu8 NumUnicastDNSServers;
-
-#define localdomain (*(const domainname *)"\x5" "local")
-#define DeviceInfoName (*(const domainname *)"\xC" "_device-info" "\x4" "_tcp")
-#define SleepProxyServiceType (*(const domainname *)"\xC" "_sleep-proxy" "\x4" "_udp")
-
-// ***************************************************************************
-#if 0
-#pragma mark -
-#pragma mark - Inline functions
-#endif
-
-#if (defined(_MSC_VER))
- #define mDNSinline static __inline
-#elif ((__GNUC__ > 2) || ((__GNUC__ == 2) && (__GNUC_MINOR__ >= 9)))
- #define mDNSinline static inline
-#endif
-
-// If we're not doing inline functions, then this header needs to have the extern declarations
-#if !defined(mDNSinline)
-extern mDNSs32 NonZeroTime(mDNSs32 t);
-extern mDNSu16 mDNSVal16(mDNSOpaque16 x);
-extern mDNSOpaque16 mDNSOpaque16fromIntVal(mDNSu16 v);
-#endif
-
-// If we're compiling the particular C file that instantiates our inlines, then we
-// define "mDNSinline" (to empty string) so that we generate code in the following section
-#if (!defined(mDNSinline) && mDNS_InstantiateInlines)
-#define mDNSinline
-#endif
-
-#ifdef mDNSinline
-
-mDNSinline mDNSs32 NonZeroTime(mDNSs32 t) { if (t) return(t); else return(1); }
-
-mDNSinline mDNSu16 mDNSVal16(mDNSOpaque16 x) { return((mDNSu16)((mDNSu16)x.b[0] << 8 | (mDNSu16)x.b[1])); }
-
-mDNSinline mDNSOpaque16 mDNSOpaque16fromIntVal(mDNSu16 v)
- {
- mDNSOpaque16 x;
- x.b[0] = (mDNSu8)(v >> 8);
- x.b[1] = (mDNSu8)(v & 0xFF);
- return(x);
- }
-
-#endif
-
-// ***************************************************************************
-#if 0
-#pragma mark -
-#pragma mark - Main Client Functions
-#endif
-
-// Every client should call mDNS_Init, passing in storage for the mDNS object and the mDNS_PlatformSupport object.
-//
-// Clients that are only advertising services should use mDNS_Init_NoCache and mDNS_Init_ZeroCacheSize.
-// Clients that plan to perform queries (mDNS_StartQuery, mDNS_StartBrowse, mDNS_StartResolveService, etc.)
-// need to provide storage for the resource record cache, or the query calls will return 'mStatus_NoCache'.
-// The rrcachestorage parameter is the address of memory for the resource record cache, and
-// the rrcachesize parameter is the number of entries in the CacheRecord array passed in.
-// (i.e. the size of the cache memory needs to be sizeof(CacheRecord) * rrcachesize).
-// OS X 10.3 Panther uses an initial cache size of 64 entries, and then mDNSCore sends an
-// mStatus_GrowCache message if it needs more.
-//
-// Most clients should use mDNS_Init_AdvertiseLocalAddresses. This causes mDNSCore to automatically
-// create the correct address records for all the hosts interfaces. If you plan to advertise
-// services being offered by the local machine, this is almost always what you want.
-// There are two cases where you might use mDNS_Init_DontAdvertiseLocalAddresses:
-// 1. A client-only device, that browses for services but doesn't advertise any of its own.
-// 2. A proxy-registration service, that advertises services being offered by other machines, and takes
-// the appropriate steps to manually create the correct address records for those other machines.
-// In principle, a proxy-like registration service could manually create address records for its own machine too,
-// but this would be pointless extra effort when using mDNS_Init_AdvertiseLocalAddresses does that for you.
-//
-// Note that a client-only device that wishes to prohibit multicast advertisements (e.g. from
-// higher-layer API calls) must also set DivertMulticastAdvertisements in the mDNS structure and
-// advertise local address(es) on a loopback interface.
-//
-// When mDNS has finished setting up the client's callback is called
-// A client can also spin and poll the mDNSPlatformStatus field to see when it changes from mStatus_Waiting to mStatus_NoError
-//
-// Call mDNS_StartExit to tidy up before exiting
-// Because exiting may be an asynchronous process (e.g. if unicast records need to be deregistered)
-// client layer may choose to wait until mDNS_ExitNow() returns true before calling mDNS_FinalExit().
-//
-// Call mDNS_Register with a completed AuthRecord object to register a resource record
-// If the resource record type is kDNSRecordTypeUnique (or kDNSknownunique) then if a conflicting resource record is discovered,
-// the resource record's mDNSRecordCallback will be called with error code mStatus_NameConflict. The callback should deregister
-// the record, and may then try registering the record again after picking a new name (e.g. by automatically appending a number).
-// Following deregistration, the RecordCallback will be called with result mStatus_MemFree to signal that it is safe to deallocate
-// the record's storage (memory must be freed asynchronously to allow for goodbye packets and dynamic update deregistration).
-//
-// Call mDNS_StartQuery to initiate a query. mDNS will proceed to issue Multicast DNS query packets, and any time a response
-// is received containing a record which matches the question, the DNSQuestion's mDNSAnswerCallback function will be called
-// Call mDNS_StopQuery when no more answers are required
-//
-// Care should be taken on multi-threaded or interrupt-driven environments.
-// The main mDNS routines call mDNSPlatformLock() on entry and mDNSPlatformUnlock() on exit;
-// each platform layer needs to implement these appropriately for its respective platform.
-// For example, if the support code on a particular platform implements timer callbacks at interrupt time, then
-// mDNSPlatformLock/Unlock need to disable interrupts or do similar concurrency control to ensure that the mDNS
-// code is not entered by an interrupt-time timer callback while in the middle of processing a client call.
-
-extern mStatus mDNS_Init (mDNS *const m, mDNS_PlatformSupport *const p,
- CacheEntity *rrcachestorage, mDNSu32 rrcachesize,
- mDNSBool AdvertiseLocalAddresses,
- mDNSCallback *Callback, void *Context);
-// See notes above on use of NoCache/ZeroCacheSize
-#define mDNS_Init_NoCache mDNSNULL
-#define mDNS_Init_ZeroCacheSize 0
-// See notes above on use of Advertise/DontAdvertiseLocalAddresses
-#define mDNS_Init_AdvertiseLocalAddresses mDNStrue
-#define mDNS_Init_DontAdvertiseLocalAddresses mDNSfalse
-#define mDNS_Init_NoInitCallback mDNSNULL
-#define mDNS_Init_NoInitCallbackContext mDNSNULL
-
-extern void mDNS_ConfigChanged(mDNS *const m);
-extern void mDNS_GrowCache (mDNS *const m, CacheEntity *storage, mDNSu32 numrecords);
-extern void mDNS_GrowAuth (mDNS *const m, AuthEntity *storage, mDNSu32 numrecords);
-extern void mDNS_StartExit (mDNS *const m);
-extern void mDNS_FinalExit (mDNS *const m);
-#define mDNS_Close(m) do { mDNS_StartExit(m); mDNS_FinalExit(m); } while(0)
-#define mDNS_ExitNow(m, now) ((now) - (m)->ShutdownTime >= 0 || (!(m)->ResourceRecords))
-
-extern mDNSs32 mDNS_Execute (mDNS *const m);
-
-extern mStatus mDNS_Register (mDNS *const m, AuthRecord *const rr);
-extern mStatus mDNS_Update (mDNS *const m, AuthRecord *const rr, mDNSu32 newttl,
- const mDNSu16 newrdlength, RData *const newrdata, mDNSRecordUpdateCallback *Callback);
-extern mStatus mDNS_Deregister(mDNS *const m, AuthRecord *const rr);
-
-extern mStatus mDNS_StartQuery(mDNS *const m, DNSQuestion *const question);
-extern mStatus mDNS_StopQuery (mDNS *const m, DNSQuestion *const question);
-extern mStatus mDNS_StopQueryWithRemoves(mDNS *const m, DNSQuestion *const question);
-extern mStatus mDNS_Reconfirm (mDNS *const m, CacheRecord *const cacherr);
-extern mStatus mDNS_ReconfirmByValue(mDNS *const m, ResourceRecord *const rr);
-extern void mDNS_PurgeCacheResourceRecord(mDNS *const m, CacheRecord *rr);
-extern mDNSs32 mDNS_TimeNow(const mDNS *const m);
-
-extern mStatus mDNS_StartNATOperation(mDNS *const m, NATTraversalInfo *traversal);
-extern mStatus mDNS_StopNATOperation(mDNS *const m, NATTraversalInfo *traversal);
-extern mStatus mDNS_StopNATOperation_internal(mDNS *m, NATTraversalInfo *traversal);
-
-extern DomainAuthInfo *GetAuthInfoForName(mDNS *m, const domainname *const name);
-
-extern void mDNS_UpdateAllowSleep(mDNS *const m);
-
-// ***************************************************************************
-#if 0
-#pragma mark -
-#pragma mark - Platform support functions that are accessible to the client layer too
-#endif
-
-extern mDNSs32 mDNSPlatformOneSecond;
-
-// ***************************************************************************
-#if 0
-#pragma mark -
-#pragma mark - General utility and helper functions
-#endif
-
-// mDNS_Dereg_normal is used for most calls to mDNS_Deregister_internal
-// mDNS_Dereg_rapid is used to send one goodbye instead of three, when we want the memory available for reuse sooner
-// mDNS_Dereg_conflict is used to indicate that this record is being forcibly deregistered because of a conflict
-// mDNS_Dereg_repeat is used when cleaning up, for records that may have already been forcibly deregistered
-typedef enum { mDNS_Dereg_normal, mDNS_Dereg_rapid, mDNS_Dereg_conflict, mDNS_Dereg_repeat } mDNS_Dereg_type;
-
-// mDNS_RegisterService is a single call to register the set of resource records associated with a given named service.
-//
-// mDNS_StartResolveService is single call which is equivalent to multiple calls to mDNS_StartQuery,
-// to find the IP address, port number, and demultiplexing information for a given named service.
-// As with mDNS_StartQuery, it executes asynchronously, and calls the ServiceInfoQueryCallback when the answer is
-// found. After the service is resolved, the client should call mDNS_StopResolveService to complete the transaction.
-// The client can also call mDNS_StopResolveService at any time to abort the transaction.
-//
-// mDNS_AddRecordToService adds an additional record to a Service Record Set. This record may be deregistered
-// via mDNS_RemoveRecordFromService, or by deregistering the service. mDNS_RemoveRecordFromService is passed a
-// callback to free the memory associated with the extra RR when it is safe to do so. The ExtraResourceRecord
-// object can be found in the record's context pointer.
-
-// mDNS_GetBrowseDomains is a special case of the mDNS_StartQuery call, where the resulting answers
-// are a list of PTR records indicating (in the rdata) domains that are recommended for browsing.
-// After getting the list of domains to browse, call mDNS_StopQuery to end the search.
-// mDNS_GetDefaultBrowseDomain returns the name of the domain that should be highlighted by default.
-//
-// mDNS_GetRegistrationDomains and mDNS_GetDefaultRegistrationDomain are the equivalent calls to get the list
-// of one or more domains that should be offered to the user as choices for where they may register their service,
-// and the default domain in which to register in the case where the user has made no selection.
-
-extern void mDNS_SetupResourceRecord(AuthRecord *rr, RData *RDataStorage, mDNSInterfaceID InterfaceID,
- mDNSu16 rrtype, mDNSu32 ttl, mDNSu8 RecordType, AuthRecType artype, mDNSRecordCallback Callback, void *Context);
-
-// mDNS_RegisterService() flags parameter bit definitions
-enum
- {
- regFlagIncludeP2P = 0x1, // include P2P interfaces when using mDNSInterface_Any
- regFlagKnownUnique = 0x2 // client guarantees that SRV and TXT record names are unique
- };
-
-extern mStatus mDNS_RegisterService (mDNS *const m, ServiceRecordSet *sr,
- const domainlabel *const name, const domainname *const type, const domainname *const domain,
- const domainname *const host, mDNSIPPort port, const mDNSu8 txtinfo[], mDNSu16 txtlen,
- AuthRecord *SubTypes, mDNSu32 NumSubTypes,
- mDNSInterfaceID InterfaceID, mDNSServiceCallback Callback, void *Context, mDNSu32 flags);
-extern mStatus mDNS_AddRecordToService(mDNS *const m, ServiceRecordSet *sr, ExtraResourceRecord *extra, RData *rdata, mDNSu32 ttl, mDNSu32 includeP2P);
-extern mStatus mDNS_RemoveRecordFromService(mDNS *const m, ServiceRecordSet *sr, ExtraResourceRecord *extra, mDNSRecordCallback MemFreeCallback, void *Context);
-extern mStatus mDNS_RenameAndReregisterService(mDNS *const m, ServiceRecordSet *const sr, const domainlabel *newname);
-extern mStatus mDNS_DeregisterService_drt(mDNS *const m, ServiceRecordSet *sr, mDNS_Dereg_type drt);
-#define mDNS_DeregisterService(M,S) mDNS_DeregisterService_drt((M), (S), mDNS_Dereg_normal)
-
-extern mStatus mDNS_RegisterNoSuchService(mDNS *const m, AuthRecord *const rr,
- const domainlabel *const name, const domainname *const type, const domainname *const domain,
- const domainname *const host,
- const mDNSInterfaceID InterfaceID, mDNSRecordCallback Callback, void *Context, mDNSBool includeP2P);
-#define mDNS_DeregisterNoSuchService mDNS_Deregister
-
-extern void mDNS_SetupQuestion(DNSQuestion *const q, const mDNSInterfaceID InterfaceID, const domainname *const name,
- const mDNSu16 qtype, mDNSQuestionCallback *const callback, void *const context);
-
-extern mStatus mDNS_StartBrowse(mDNS *const m, DNSQuestion *const question,
- const domainname *const srv, const domainname *const domain,
- const mDNSInterfaceID InterfaceID, mDNSBool ForceMCast, mDNSQuestionCallback *Callback, void *Context);
-#define mDNS_StopBrowse mDNS_StopQuery
-
-extern mStatus mDNS_StartResolveService(mDNS *const m, ServiceInfoQuery *query, ServiceInfo *info, mDNSServiceInfoQueryCallback *Callback, void *Context);
-extern void mDNS_StopResolveService (mDNS *const m, ServiceInfoQuery *query);
-
-typedef enum
- {
- mDNS_DomainTypeBrowse = 0,
- mDNS_DomainTypeBrowseDefault = 1,
- mDNS_DomainTypeBrowseAutomatic = 2,
- mDNS_DomainTypeRegistration = 3,
- mDNS_DomainTypeRegistrationDefault = 4,
-
- mDNS_DomainTypeMax = 4
- } mDNS_DomainType;
-
-extern const char *const mDNS_DomainTypeNames[];
-
-extern mStatus mDNS_GetDomains(mDNS *const m, DNSQuestion *const question, mDNS_DomainType DomainType, const domainname *dom,
- const mDNSInterfaceID InterfaceID, mDNSQuestionCallback *Callback, void *Context);
-#define mDNS_StopGetDomains mDNS_StopQuery
-extern mStatus mDNS_AdvertiseDomains(mDNS *const m, AuthRecord *rr, mDNS_DomainType DomainType, const mDNSInterfaceID InterfaceID, char *domname);
-#define mDNS_StopAdvertiseDomains mDNS_Deregister
-
-extern mDNSOpaque16 mDNS_NewMessageID(mDNS *const m);
-extern mDNSBool mDNS_AddressIsLocalSubnet(mDNS *const m, const mDNSInterfaceID InterfaceID, const mDNSAddr *addr);
-
-extern DNSServer *GetServerForName(mDNS *m, const domainname *name, mDNSInterfaceID InterfaceID);
-extern DNSServer *GetServerForQuestion(mDNS *m, DNSQuestion *question);
-extern mDNSu32 SetValidDNSServers(mDNS *m, DNSQuestion *question);
-
-// ***************************************************************************
-#if 0
-#pragma mark -
-#pragma mark - DNS name utility functions
-#endif
-
-// In order to expose the full capabilities of the DNS protocol (which allows any arbitrary eight-bit values
-// in domain name labels, including unlikely characters like ascii nulls and even dots) all the mDNS APIs
-// work with DNS's native length-prefixed strings. For convenience in C, the following utility functions
-// are provided for converting between C's null-terminated strings and DNS's length-prefixed strings.
-
-// Assignment
-// A simple C structure assignment of a domainname can cause a protection fault by accessing unmapped memory,
-// because that object is defined to be 256 bytes long, but not all domainname objects are truly the full size.
-// This macro uses mDNSPlatformMemCopy() to make sure it only touches the actual bytes that are valid.
-#define AssignDomainName(DST, SRC) do { mDNSu16 len__ = DomainNameLength((SRC)); \
- if (len__ <= MAX_DOMAIN_NAME) mDNSPlatformMemCopy((DST)->c, (SRC)->c, len__); else (DST)->c[0] = 0; } while(0)
-
-// Comparison functions
-#define SameDomainLabelCS(A,B) ((A)[0] == (B)[0] && mDNSPlatformMemSame((A)+1, (B)+1, (A)[0]))
-extern mDNSBool SameDomainLabel(const mDNSu8 *a, const mDNSu8 *b);
-extern mDNSBool SameDomainName(const domainname *const d1, const domainname *const d2);
-extern mDNSBool SameDomainNameCS(const domainname *const d1, const domainname *const d2);
-typedef mDNSBool DomainNameComparisonFn(const domainname *const d1, const domainname *const d2);
-extern mDNSBool IsLocalDomain(const domainname *d); // returns true for domains that by default should be looked up using link-local multicast
-
-#define StripFirstLabel(X) ((const domainname *)&(X)->c[(X)->c[0] ? 1 + (X)->c[0] : 0])
-
-#define FirstLabel(X) ((const domainlabel *)(X))
-#define SecondLabel(X) ((const domainlabel *)StripFirstLabel(X))
-#define ThirdLabel(X) ((const domainlabel *)StripFirstLabel(StripFirstLabel(X)))
-
-extern const mDNSu8 *LastLabel(const domainname *d);
-
-// Get total length of domain name, in native DNS format, including terminal root label
-// (e.g. length of "com." is 5 (length byte, three data bytes, final zero)
-extern mDNSu16 DomainNameLengthLimit(const domainname *const name, const mDNSu8 *limit);
-#define DomainNameLength(name) DomainNameLengthLimit((name), (name)->c + MAX_DOMAIN_NAME)
-
-// Append functions to append one or more labels to an existing native format domain name:
-// AppendLiteralLabelString adds a single label from a literal C string, with no escape character interpretation.
-// AppendDNSNameString adds zero or more labels from a C string using conventional DNS dots-and-escaping interpretation
-// AppendDomainLabel adds a single label from a native format domainlabel
-// AppendDomainName adds zero or more labels from a native format domainname
-extern mDNSu8 *AppendLiteralLabelString(domainname *const name, const char *cstr);
-extern mDNSu8 *AppendDNSNameString (domainname *const name, const char *cstr);
-extern mDNSu8 *AppendDomainLabel (domainname *const name, const domainlabel *const label);
-extern mDNSu8 *AppendDomainName (domainname *const name, const domainname *const append);
-
-// Convert from null-terminated string to native DNS format:
-// The DomainLabel form makes a single label from a literal C string, with no escape character interpretation.
-// The DomainName form makes native format domain name from a C string using conventional DNS interpretation:
-// dots separate labels, and within each label, '\.' represents a literal dot, '\\' represents a literal
-// backslash and backslash with three decimal digits (e.g. \000) represents an arbitrary byte value.
-extern mDNSBool MakeDomainLabelFromLiteralString(domainlabel *const label, const char *cstr);
-extern mDNSu8 *MakeDomainNameFromDNSNameString (domainname *const name, const char *cstr);
-
-// Convert native format domainlabel or domainname back to C string format
-// IMPORTANT:
-// When using ConvertDomainLabelToCString, the target buffer must be MAX_ESCAPED_DOMAIN_LABEL (254) bytes long
-// to guarantee there will be no buffer overrun. It is only safe to use a buffer shorter than this in rare cases
-// where the label is known to be constrained somehow (for example, if the label is known to be either "_tcp" or "_udp").
-// Similarly, when using ConvertDomainNameToCString, the target buffer must be MAX_ESCAPED_DOMAIN_NAME (1009) bytes long.
-// See definitions of MAX_ESCAPED_DOMAIN_LABEL and MAX_ESCAPED_DOMAIN_NAME for more detailed explanation.
-extern char *ConvertDomainLabelToCString_withescape(const domainlabel *const name, char *cstr, char esc);
-#define ConvertDomainLabelToCString_unescaped(D,C) ConvertDomainLabelToCString_withescape((D), (C), 0)
-#define ConvertDomainLabelToCString(D,C) ConvertDomainLabelToCString_withescape((D), (C), '\\')
-extern char *ConvertDomainNameToCString_withescape(const domainname *const name, char *cstr, char esc);
-#define ConvertDomainNameToCString_unescaped(D,C) ConvertDomainNameToCString_withescape((D), (C), 0)
-#define ConvertDomainNameToCString(D,C) ConvertDomainNameToCString_withescape((D), (C), '\\')
-
-extern void ConvertUTF8PstringToRFC1034HostLabel(const mDNSu8 UTF8Name[], domainlabel *const hostlabel);
-
-extern mDNSu8 *ConstructServiceName(domainname *const fqdn, const domainlabel *name, const domainname *type, const domainname *const domain);
-extern mDNSBool DeconstructServiceName(const domainname *const fqdn, domainlabel *const name, domainname *const type, domainname *const domain);
-
-// Note: Some old functions have been replaced by more sensibly-named versions.
-// You can uncomment the hash-defines below if you don't want to have to change your source code right away.
-// When updating your code, note that (unlike the old versions) *all* the new routines take the target object
-// as their first parameter.
-//#define ConvertCStringToDomainName(SRC,DST) MakeDomainNameFromDNSNameString((DST),(SRC))
-//#define ConvertCStringToDomainLabel(SRC,DST) MakeDomainLabelFromLiteralString((DST),(SRC))
-//#define AppendStringLabelToName(DST,SRC) AppendLiteralLabelString((DST),(SRC))
-//#define AppendStringNameToName(DST,SRC) AppendDNSNameString((DST),(SRC))
-//#define AppendDomainLabelToName(DST,SRC) AppendDomainLabel((DST),(SRC))
-//#define AppendDomainNameToName(DST,SRC) AppendDomainName((DST),(SRC))
-
-// ***************************************************************************
-#if 0
-#pragma mark -
-#pragma mark - Other utility functions and macros
-#endif
-
-// mDNS_vsnprintf/snprintf return the number of characters written, excluding the final terminating null.
-// The output is always null-terminated: for example, if the output turns out to be exactly buflen long,
-// then the output will be truncated by one character to allow space for the terminating null.
-// Unlike standard C vsnprintf/snprintf, they return the number of characters *actually* written,
-// not the number of characters that *would* have been printed were buflen unlimited.
-extern mDNSu32 mDNS_vsnprintf(char *sbuffer, mDNSu32 buflen, const char *fmt, va_list arg);
-extern mDNSu32 mDNS_snprintf(char *sbuffer, mDNSu32 buflen, const char *fmt, ...) IS_A_PRINTF_STYLE_FUNCTION(3,4);
-extern mDNSu32 NumCacheRecordsForInterfaceID(const mDNS *const m, mDNSInterfaceID id);
-extern char *DNSTypeName(mDNSu16 rrtype);
-extern char *GetRRDisplayString_rdb(const ResourceRecord *const rr, const RDataBody *const rd1, char *const buffer);
-#define RRDisplayString(m, rr) GetRRDisplayString_rdb(rr, &(rr)->rdata->u, (m)->MsgBuffer)
-#define ARDisplayString(m, rr) GetRRDisplayString_rdb(&(rr)->resrec, &(rr)->resrec.rdata->u, (m)->MsgBuffer)
-#define CRDisplayString(m, rr) GetRRDisplayString_rdb(&(rr)->resrec, &(rr)->resrec.rdata->u, (m)->MsgBuffer)
-extern mDNSBool mDNSSameAddress(const mDNSAddr *ip1, const mDNSAddr *ip2);
-extern void IncrementLabelSuffix(domainlabel *name, mDNSBool RichText);
-extern mDNSBool mDNSv4AddrIsRFC1918(mDNSv4Addr *addr); // returns true for RFC1918 private addresses
-#define mDNSAddrIsRFC1918(X) ((X)->type == mDNSAddrType_IPv4 && mDNSv4AddrIsRFC1918(&(X)->ip.v4))
-
-#define mDNSSameIPPort(A,B) ((A).NotAnInteger == (B).NotAnInteger)
-#define mDNSSameOpaque16(A,B) ((A).NotAnInteger == (B).NotAnInteger)
-#define mDNSSameOpaque32(A,B) ((A).NotAnInteger == (B).NotAnInteger)
-#define mDNSSameOpaque64(A,B) ((A)->l[0] == (B)->l[0] && (A)->l[1] == (B)->l[1])
-
-#define mDNSSameIPv4Address(A,B) ((A).NotAnInteger == (B).NotAnInteger)
-#define mDNSSameIPv6Address(A,B) ((A).l[0] == (B).l[0] && (A).l[1] == (B).l[1] && (A).l[2] == (B).l[2] && (A).l[3] == (B).l[3])
-#define mDNSSameEthAddress(A,B) ((A)->w[0] == (B)->w[0] && (A)->w[1] == (B)->w[1] && (A)->w[2] == (B)->w[2])
-
-#define mDNSIPPortIsZero(A) ((A).NotAnInteger == 0)
-#define mDNSOpaque16IsZero(A) ((A).NotAnInteger == 0)
-#define mDNSOpaque64IsZero(A) (((A)->l[0] | (A)->l[1] ) == 0)
-#define mDNSIPv4AddressIsZero(A) ((A).NotAnInteger == 0)
-#define mDNSIPv6AddressIsZero(A) (((A).l[0] | (A).l[1] | (A).l[2] | (A).l[3]) == 0)
-#define mDNSEthAddressIsZero(A) (((A).w[0] | (A).w[1] | (A).w[2] ) == 0)
-
-#define mDNSIPv4AddressIsOnes(A) ((A).NotAnInteger == 0xFFFFFFFF)
-#define mDNSIPv6AddressIsOnes(A) (((A).l[0] & (A).l[1] & (A).l[2] & (A).l[3]) == 0xFFFFFFFF)
-
-#define mDNSAddressIsAllDNSLinkGroup(X) ( \
- ((X)->type == mDNSAddrType_IPv4 && mDNSSameIPv4Address((X)->ip.v4, AllDNSLinkGroup_v4.ip.v4)) || \
- ((X)->type == mDNSAddrType_IPv6 && mDNSSameIPv6Address((X)->ip.v6, AllDNSLinkGroup_v6.ip.v6)) )
-
-#define mDNSAddressIsZero(X) ( \
- ((X)->type == mDNSAddrType_IPv4 && mDNSIPv4AddressIsZero((X)->ip.v4)) || \
- ((X)->type == mDNSAddrType_IPv6 && mDNSIPv6AddressIsZero((X)->ip.v6)) )
-
-#define mDNSAddressIsValidNonZero(X) ( \
- ((X)->type == mDNSAddrType_IPv4 && !mDNSIPv4AddressIsZero((X)->ip.v4)) || \
- ((X)->type == mDNSAddrType_IPv6 && !mDNSIPv6AddressIsZero((X)->ip.v6)) )
-
-#define mDNSAddressIsOnes(X) ( \
- ((X)->type == mDNSAddrType_IPv4 && mDNSIPv4AddressIsOnes((X)->ip.v4)) || \
- ((X)->type == mDNSAddrType_IPv6 && mDNSIPv6AddressIsOnes((X)->ip.v6)) )
-
-#define mDNSAddressIsValid(X) ( \
- ((X)->type == mDNSAddrType_IPv4) ? !(mDNSIPv4AddressIsZero((X)->ip.v4) || mDNSIPv4AddressIsOnes((X)->ip.v4)) : \
- ((X)->type == mDNSAddrType_IPv6) ? !(mDNSIPv6AddressIsZero((X)->ip.v6) || mDNSIPv6AddressIsOnes((X)->ip.v6)) : mDNSfalse)
-
-#define mDNSv4AddressIsLinkLocal(X) ((X)->b[0] == 169 && (X)->b[1] == 254)
-#define mDNSv6AddressIsLinkLocal(X) ((X)->b[0] == 0xFE && ((X)->b[1] & 0xC0) == 0x80)
-
-#define mDNSAddressIsLinkLocal(X) ( \
- ((X)->type == mDNSAddrType_IPv4) ? mDNSv4AddressIsLinkLocal(&(X)->ip.v4) : \
- ((X)->type == mDNSAddrType_IPv6) ? mDNSv6AddressIsLinkLocal(&(X)->ip.v6) : mDNSfalse)
-
-#define mDNSv4AddressIsLoopback(X) ((X)->b[0] == 127 && (X)->b[1] == 0 && (X)->b[2] == 0 && (X)->b[3] == 1)
-#define mDNSv6AddressIsLoopback(X) ((((X)->l[0] | (X)->l[1] | (X)->l[2]) == 0) && ((X)->b[12] == 0 && (X)->b[13] == 0 && (X)->b[14] == 0 && (X)->b[15] == 1))
-
-// ***************************************************************************
-#if 0
-#pragma mark -
-#pragma mark - Authentication Support
-#endif
-
-// Unicast DNS and Dynamic Update specific Client Calls
-//
-// mDNS_SetSecretForDomain tells the core to authenticate (via TSIG with an HMAC_MD5 hash of the shared secret)
-// when dynamically updating a given zone (and its subdomains). The key used in authentication must be in
-// domain name format. The shared secret must be a null-terminated base64 encoded string. A minimum size of
-// 16 bytes (128 bits) is recommended for an MD5 hash as per RFC 2485.
-// Calling this routine multiple times for a zone replaces previously entered values. Call with a NULL key
-// to disable authentication for the zone. A non-NULL autoTunnelPrefix means this is an AutoTunnel domain,
-// and the value is prepended to the IPSec identifier (used for key lookup)
-
-extern mStatus mDNS_SetSecretForDomain(mDNS *m, DomainAuthInfo *info,
- const domainname *domain, const domainname *keyname, const char *b64keydata, const domainname *hostname, mDNSIPPort *port, const char *autoTunnelPrefix);
-
-extern void RecreateNATMappings(mDNS *const m);
-
-// Hostname/Unicast Interface Configuration
-
-// All hostnames advertised point to one IPv4 address and/or one IPv6 address, set via SetPrimaryInterfaceInfo. Invoking this routine
-// updates all existing hostnames to point to the new address.
-
-// A hostname is added via AddDynDNSHostName, which points to the primary interface's v4 and/or v6 addresss
-
-// The status callback is invoked to convey success or failure codes - the callback should not modify the AuthRecord or free memory.
-// Added hostnames may be removed (deregistered) via mDNS_RemoveDynDNSHostName.
-
-// Host domains added prior to specification of the primary interface address and computer name will be deferred until
-// these values are initialized.
-
-// DNS servers used to resolve unicast queries are specified by mDNS_AddDNSServer.
-// For "split" DNS configurations, in which queries for different domains are sent to different servers (e.g. VPN and external),
-// a domain may be associated with a DNS server. For standard configurations, specify the root label (".") or NULL.
-
-extern void mDNS_AddDynDNSHostName(mDNS *m, const domainname *fqdn, mDNSRecordCallback *StatusCallback, const void *StatusContext);
-extern void mDNS_RemoveDynDNSHostName(mDNS *m, const domainname *fqdn);
-extern void mDNS_SetPrimaryInterfaceInfo(mDNS *m, const mDNSAddr *v4addr, const mDNSAddr *v6addr, const mDNSAddr *router);
-extern DNSServer *mDNS_AddDNSServer(mDNS *const m, const domainname *d, const mDNSInterfaceID interface, const mDNSAddr *addr, const mDNSIPPort port, mDNSBool scoped, mDNSu32 timeout, mDNSBool cellIntf);
-extern void PenalizeDNSServer(mDNS *const m, DNSQuestion *q);
-extern void mDNS_AddSearchDomain(const domainname *const domain, mDNSInterfaceID InterfaceID);
-
-extern McastResolver *mDNS_AddMcastResolver(mDNS *const m, const domainname *d, const mDNSInterfaceID interface, mDNSu32 timeout);
-
-// We use ((void *)0) here instead of mDNSNULL to avoid compile warnings on gcc 4.2
-#define mDNS_AddSearchDomain_CString(X, I) \
- do { domainname d__; if (((X) != (void*)0) && MakeDomainNameFromDNSNameString(&d__, (X)) && d__.c[0]) mDNS_AddSearchDomain(&d__, I); } while(0)
-
-// Routines called by the core, exported by DNSDigest.c
-
-// Convert an arbitrary base64 encoded key key into an HMAC key (stored in AuthInfo struct)
-extern mDNSs32 DNSDigest_ConstructHMACKeyfromBase64(DomainAuthInfo *info, const char *b64key);
-
-// sign a DNS message. The message must be complete, with all values in network byte order. end points to the end
-// of the message, and is modified by this routine. numAdditionals is a pointer to the number of additional
-// records in HOST byte order, which is incremented upon successful completion of this routine. The function returns
-// the new end pointer on success, and NULL on failure.
-extern void DNSDigest_SignMessage(DNSMessage *msg, mDNSu8 **end, DomainAuthInfo *info, mDNSu16 tcode);
-
-#define SwapDNSHeaderBytes(M) do { \
- (M)->h.numQuestions = (mDNSu16)((mDNSu8 *)&(M)->h.numQuestions )[0] << 8 | ((mDNSu8 *)&(M)->h.numQuestions )[1]; \
- (M)->h.numAnswers = (mDNSu16)((mDNSu8 *)&(M)->h.numAnswers )[0] << 8 | ((mDNSu8 *)&(M)->h.numAnswers )[1]; \
- (M)->h.numAuthorities = (mDNSu16)((mDNSu8 *)&(M)->h.numAuthorities)[0] << 8 | ((mDNSu8 *)&(M)->h.numAuthorities)[1]; \
- (M)->h.numAdditionals = (mDNSu16)((mDNSu8 *)&(M)->h.numAdditionals)[0] << 8 | ((mDNSu8 *)&(M)->h.numAdditionals)[1]; \
- } while (0)
-
-#define DNSDigest_SignMessageHostByteOrder(M,E,INFO) \
- do { SwapDNSHeaderBytes(M); DNSDigest_SignMessage((M), (E), (INFO), 0); SwapDNSHeaderBytes(M); } while (0)
-
-// verify a DNS message. The message must be complete, with all values in network byte order. end points to the
-// end of the record. tsig is a pointer to the resource record that contains the TSIG OPT record. info is
-// the matching key to use for verifying the message. This function expects that the additionals member
-// of the DNS message header has already had one subtracted from it.
-extern mDNSBool DNSDigest_VerifyMessage(DNSMessage *msg, mDNSu8 *end, LargeCacheRecord *tsig, DomainAuthInfo *info, mDNSu16 *rcode, mDNSu16 *tcode);
-
-// ***************************************************************************
-#if 0
-#pragma mark -
-#pragma mark - PlatformSupport interface
-#endif
-
-// This section defines the interface to the Platform Support layer.
-// Normal client code should not use any of types defined here, or directly call any of the functions defined here.
-// The definitions are placed here because sometimes clients do use these calls indirectly, via other supported client operations.
-// For example, AssignDomainName is a macro defined using mDNSPlatformMemCopy()
-
-// Every platform support module must provide the following functions.
-// mDNSPlatformInit() typically opens a communication endpoint, and starts listening for mDNS packets.
-// When Setup is complete, the platform support layer calls mDNSCoreInitComplete().
-// mDNSPlatformSendUDP() sends one UDP packet
-// When a packet is received, the PlatformSupport code calls mDNSCoreReceive()
-// mDNSPlatformClose() tidies up on exit
-//
-// Note: mDNSPlatformMemAllocate/mDNSPlatformMemFree are only required for handling oversized resource records and unicast DNS.
-// If your target platform has a well-defined specialized application, and you know that all the records it uses
-// are InlineCacheRDSize or less, then you can just make a simple mDNSPlatformMemAllocate() stub that always returns
-// NULL. InlineCacheRDSize is a compile-time constant, which is set by default to 68. If you need to handle records
-// a little larger than this and you don't want to have to implement run-time allocation and freeing, then you
-// can raise the value of this constant to a suitable value (at the expense of increased memory usage).
-//
-// USE CAUTION WHEN CALLING mDNSPlatformRawTime: The m->timenow_adjust correction factor needs to be added
-// Generally speaking:
-// Code that's protected by the main mDNS lock should just use the m->timenow value
-// Code outside the main mDNS lock should use mDNS_TimeNow(m) to get properly adjusted time
-// In certain cases there may be reasons why it's necessary to get the time without taking the lock first
-// (e.g. inside the routines that are doing the locking and unlocking, where a call to get the lock would result in a
-// recursive loop); in these cases use mDNS_TimeNow_NoLock(m) to get mDNSPlatformRawTime with the proper correction factor added.
-//
-// mDNSPlatformUTC returns the time, in seconds, since Jan 1st 1970 UTC and is required for generating TSIG records
-
-extern mStatus mDNSPlatformInit (mDNS *const m);
-extern void mDNSPlatformClose (mDNS *const m);
-extern mStatus mDNSPlatformSendUDP(const mDNS *const m, const void *const msg, const mDNSu8 *const end,
-mDNSInterfaceID InterfaceID, UDPSocket *src, const mDNSAddr *dst, mDNSIPPort dstport);
-
-extern void mDNSPlatformLock (const mDNS *const m);
-extern void mDNSPlatformUnlock (const mDNS *const m);
-
-extern void mDNSPlatformStrCopy ( void *dst, const void *src);
-extern mDNSu32 mDNSPlatformStrLen ( const void *src);
-extern void mDNSPlatformMemCopy ( void *dst, const void *src, mDNSu32 len);
-extern mDNSBool mDNSPlatformMemSame (const void *dst, const void *src, mDNSu32 len);
-extern void mDNSPlatformMemZero ( void *dst, mDNSu32 len);
-#if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING
-#define mDNSPlatformMemAllocate(X) mallocL(#X, X)
-#else
-extern void * mDNSPlatformMemAllocate (mDNSu32 len);
-#endif
-extern void mDNSPlatformMemFree (void *mem);
-
-// If the platform doesn't have a strong PRNG, we define a naive multiply-and-add based on a seed
-// from the platform layer. Long-term, we should embed an arc4 implementation, but the strength
-// will still depend on the randomness of the seed.
-#if !defined(_PLATFORM_HAS_STRONG_PRNG_) && (_BUILDING_XCODE_PROJECT_ || defined(_WIN32))
-#define _PLATFORM_HAS_STRONG_PRNG_ 1
-#endif
-#if _PLATFORM_HAS_STRONG_PRNG_
-extern mDNSu32 mDNSPlatformRandomNumber(void);
-#else
-extern mDNSu32 mDNSPlatformRandomSeed (void);
-#endif // _PLATFORM_HAS_STRONG_PRNG_
-
-extern mStatus mDNSPlatformTimeInit (void);
-extern mDNSs32 mDNSPlatformRawTime (void);
-extern mDNSs32 mDNSPlatformUTC (void);
-#define mDNS_TimeNow_NoLock(m) (mDNSPlatformRawTime() + (m)->timenow_adjust)
-
-#if MDNS_DEBUGMSGS
-extern void mDNSPlatformWriteDebugMsg(const char *msg);
-#endif
-extern void mDNSPlatformWriteLogMsg(const char *ident, const char *msg, mDNSLogLevel_t loglevel);
-
-#if APPLE_OSX_mDNSResponder
-// Utility function for ASL logging
-mDNSexport void mDNSASLLog(uuid_t *uuid, const char *subdomain, const char *result, const char *signature, const char *fmt, ...);
-#endif
-
-// Platform support modules should provide the following functions to map between opaque interface IDs
-// and interface indexes in order to support the DNS-SD API. If your target platform does not support
-// multiple interfaces and/or does not support the DNS-SD API, these functions can be empty.
-extern mDNSInterfaceID mDNSPlatformInterfaceIDfromInterfaceIndex(mDNS *const m, mDNSu32 ifindex);
-extern mDNSu32 mDNSPlatformInterfaceIndexfromInterfaceID(mDNS *const m, mDNSInterfaceID id, mDNSBool suppressNetworkChange);
-
-// Every platform support module must provide the following functions if it is to support unicast DNS
-// and Dynamic Update.
-// All TCP socket operations implemented by the platform layer MUST NOT BLOCK.
-// mDNSPlatformTCPConnect initiates a TCP connection with a peer, adding the socket descriptor to the
-// main event loop. The return value indicates whether the connection succeeded, failed, or is pending
-// (i.e. the call would block.) On return, the descriptor parameter is set to point to the connected socket.
-// The TCPConnectionCallback is subsequently invoked when the connection
-// completes (in which case the ConnectionEstablished parameter is true), or data is available for
-// reading on the socket (indicated by the ConnectionEstablished parameter being false.) If the connection
-// asynchronously fails, the TCPConnectionCallback should be invoked as usual, with the error being
-// returned in subsequent calls to PlatformReadTCP or PlatformWriteTCP. (This allows for platforms
-// with limited asynchronous error detection capabilities.) PlatformReadTCP and PlatformWriteTCP must
-// return the number of bytes read/written, 0 if the call would block, and -1 if an error. PlatformReadTCP
-// should set the closed argument if the socket has been closed.
-// PlatformTCPCloseConnection must close the connection to the peer and remove the descriptor from the
-// event loop. CloseConnectin may be called at any time, including in a ConnectionCallback.
-
-typedef enum
- {
- kTCPSocketFlags_Zero = 0,
- kTCPSocketFlags_UseTLS = (1 << 0)
- } TCPSocketFlags;
-
-typedef void (*TCPConnectionCallback)(TCPSocket *sock, void *context, mDNSBool ConnectionEstablished, mStatus err);
-extern TCPSocket *mDNSPlatformTCPSocket(mDNS *const m, TCPSocketFlags flags, mDNSIPPort *port); // creates a TCP socket
-extern TCPSocket *mDNSPlatformTCPAccept(TCPSocketFlags flags, int sd);
-extern int mDNSPlatformTCPGetFD(TCPSocket *sock);
-extern mStatus mDNSPlatformTCPConnect(TCPSocket *sock, const mDNSAddr *dst, mDNSOpaque16 dstport, domainname *hostname,
- mDNSInterfaceID InterfaceID, TCPConnectionCallback callback, void *context);
-extern void mDNSPlatformTCPCloseConnection(TCPSocket *sock);
-extern long mDNSPlatformReadTCP(TCPSocket *sock, void *buf, unsigned long buflen, mDNSBool *closed);
-extern long mDNSPlatformWriteTCP(TCPSocket *sock, const char *msg, unsigned long len);
-extern UDPSocket *mDNSPlatformUDPSocket(mDNS *const m, const mDNSIPPort requestedport);
-extern void mDNSPlatformUDPClose(UDPSocket *sock);
-extern void mDNSPlatformReceiveBPF_fd(mDNS *const m, int fd);
-extern void mDNSPlatformUpdateProxyList(mDNS *const m, const mDNSInterfaceID InterfaceID);
-extern void mDNSPlatformSendRawPacket(const void *const msg, const mDNSu8 *const end, mDNSInterfaceID InterfaceID);
-extern void mDNSPlatformSetLocalAddressCacheEntry(mDNS *const m, const mDNSAddr *const tpa, const mDNSEthAddr *const tha, mDNSInterfaceID InterfaceID);
-extern void mDNSPlatformSourceAddrForDest(mDNSAddr *const src, const mDNSAddr *const dst);
-
-// mDNSPlatformTLSSetupCerts/mDNSPlatformTLSTearDownCerts used by dnsextd
-extern mStatus mDNSPlatformTLSSetupCerts(void);
-extern void mDNSPlatformTLSTearDownCerts(void);
-
-// Platforms that support unicast browsing and dynamic update registration for clients who do not specify a domain
-// in browse/registration calls must implement these routines to get the "default" browse/registration list.
-
-extern void mDNSPlatformSetDNSConfig(mDNS *const m, mDNSBool setservers, mDNSBool setsearch, domainname *const fqdn, DNameListElem **RegDomains, DNameListElem **BrowseDomains);
-extern mStatus mDNSPlatformGetPrimaryInterface(mDNS *const m, mDNSAddr *v4, mDNSAddr *v6, mDNSAddr *router);
-extern void mDNSPlatformDynDNSHostNameStatusChanged(const domainname *const dname, const mStatus status);
-
-extern void mDNSPlatformSetAllowSleep(mDNS *const m, mDNSBool allowSleep, const char *reason);
-extern void mDNSPlatformSendWakeupPacket(mDNS *const m, mDNSInterfaceID InterfaceID, char *EthAddr, char *IPAddr, int iteration);
-extern mDNSBool mDNSPlatformValidRecordForInterface(AuthRecord *rr, const NetworkInterfaceInfo *intf);
-
-#ifdef _LEGACY_NAT_TRAVERSAL_
-// Support for legacy NAT traversal protocols, implemented by the platform layer and callable by the core.
-extern void LNT_SendDiscoveryMsg(mDNS *m);
-extern void LNT_ConfigureRouterInfo(mDNS *m, const mDNSInterfaceID InterfaceID, const mDNSu8 *const data, const mDNSu16 len);
-extern mStatus LNT_GetExternalAddress(mDNS *m);
-extern mStatus LNT_MapPort(mDNS *m, NATTraversalInfo *const n);
-extern mStatus LNT_UnmapPort(mDNS *m, NATTraversalInfo *const n);
-extern void LNT_ClearState(mDNS *const m);
-#endif // _LEGACY_NAT_TRAVERSAL_
-
-// The core mDNS code provides these functions, for the platform support code to call at appropriate times
-//
-// mDNS_SetFQDN() is called once on startup (typically from mDNSPlatformInit())
-// and then again on each subsequent change of the host name.
-//
-// mDNS_RegisterInterface() is used by the platform support layer to inform mDNSCore of what
-// physical and/or logical interfaces are available for sending and receiving packets.
-// Typically it is called on startup for each available interface, but register/deregister may be
-// called again later, on multiple occasions, to inform the core of interface configuration changes.
-// If set->Advertise is set non-zero, then mDNS_RegisterInterface() also registers the standard
-// resource records that should be associated with every publicised IP address/interface:
-// -- Name-to-address records (A/AAAA)
-// -- Address-to-name records (PTR)
-// -- Host information (HINFO)
-// IMPORTANT: The specified mDNSInterfaceID MUST NOT be 0, -1, or -2; these values have special meaning
-// mDNS_RegisterInterface does not result in the registration of global hostnames via dynamic update -
-// see mDNS_SetPrimaryInterfaceInfo, mDNS_AddDynDNSHostName, etc. for this purpose.
-// Note that the set may be deallocated immediately after it is deregistered via mDNS_DeegisterInterface.
-//
-// mDNS_RegisterDNS() is used by the platform support layer to provide the core with the addresses of
-// available domain name servers for unicast queries/updates. RegisterDNS() should be called once for
-// each name server, typically at startup, or when a new name server becomes available. DeregiterDNS()
-// must be called whenever a registered name server becomes unavailable. DeregisterDNSList deregisters
-// all registered servers. mDNS_DNSRegistered() returns true if one or more servers are registered in the core.
-//
-// mDNSCoreInitComplete() is called when the platform support layer is finished.
-// Typically this is at the end of mDNSPlatformInit(), but may be later
-// (on platforms like OT that allow asynchronous initialization of the networking stack).
-//
-// mDNSCoreReceive() is called when a UDP packet is received
-//
-// mDNSCoreMachineSleep() is called when the machine sleeps or wakes
-// (This refers to heavyweight laptop-style sleep/wake that disables network access,
-// not lightweight second-by-second CPU power management modes.)
-
-extern void mDNS_SetFQDN(mDNS *const m);
-extern void mDNS_ActivateNetWake_internal (mDNS *const m, NetworkInterfaceInfo *set);
-extern void mDNS_DeactivateNetWake_internal(mDNS *const m, NetworkInterfaceInfo *set);
-extern mStatus mDNS_RegisterInterface (mDNS *const m, NetworkInterfaceInfo *set, mDNSBool flapping);
-extern void mDNS_DeregisterInterface(mDNS *const m, NetworkInterfaceInfo *set, mDNSBool flapping);
-extern void mDNSCoreInitComplete(mDNS *const m, mStatus result);
-extern void mDNSCoreReceive(mDNS *const m, void *const msg, const mDNSu8 *const end,
- const mDNSAddr *const srcaddr, const mDNSIPPort srcport,
- const mDNSAddr *dstaddr, const mDNSIPPort dstport, const mDNSInterfaceID InterfaceID);
-extern void mDNSCoreRestartQueries(mDNS *const m);
-typedef void (*FlushCache)(mDNS *const m);
-typedef void (*CallbackBeforeStartQuery)(mDNS *const m, void *context);
-extern void mDNSCoreRestartAddressQueries(mDNS *const m, mDNSBool SearchDomainsChanged, FlushCache flushCacheRecords,
- CallbackBeforeStartQuery beforeQueryStart, void *context);
-extern mDNSBool mDNSCoreHaveAdvertisedMulticastServices(mDNS *const m);
-extern void mDNSCoreMachineSleep(mDNS *const m, mDNSBool wake);
-extern mDNSBool mDNSCoreReadyForSleep(mDNS *m, mDNSs32 now);
-extern mDNSs32 mDNSCoreIntervalToNextWake(mDNS *const m, mDNSs32 now);
-
-extern void mDNSCoreReceiveRawPacket (mDNS *const m, const mDNSu8 *const p, const mDNSu8 *const end, const mDNSInterfaceID InterfaceID);
-
-extern mDNSBool mDNSAddrIsDNSMulticast(const mDNSAddr *ip);
-
-extern CacheRecord *CreateNewCacheEntry(mDNS *const m, const mDNSu32 slot, CacheGroup *cg, mDNSs32 delay);
-extern void ScheduleNextCacheCheckTime(mDNS *const m, const mDNSu32 slot, const mDNSs32 event);
-extern void GrantCacheExtensions(mDNS *const m, DNSQuestion *q, mDNSu32 lease);
-extern void MakeNegativeCacheRecord(mDNS *const m, CacheRecord *const cr,
- const domainname *const name, const mDNSu32 namehash, const mDNSu16 rrtype, const mDNSu16 rrclass, mDNSu32 ttl_seconds,
- mDNSInterfaceID InterfaceID, DNSServer *dnsserver);
-extern void CompleteDeregistration(mDNS *const m, AuthRecord *rr);
-extern void AnswerCurrentQuestionWithResourceRecord(mDNS *const m, CacheRecord *const rr, const QC_result AddRecord);
-extern char *InterfaceNameForID(mDNS *const m, const mDNSInterfaceID InterfaceID);
-extern void DNSServerChangeForQuestion(mDNS *const m, DNSQuestion *q, DNSServer *newServer);
-extern void ActivateUnicastRegistration(mDNS *const m, AuthRecord *const rr);
-extern void CheckSuppressUnusableQuestions(mDNS *const m);
-extern void RetrySearchDomainQuestions(mDNS *const m);
-extern mDNSBool DomainEnumQuery(const domainname *qname);
-
-// Used only in logging to restrict the number of /etc/hosts entries printed
-extern void FreeEtcHosts(mDNS *const m, AuthRecord *const rr, mStatus result);
-// exported for using the hash for /etc/hosts AuthRecords
-extern AuthGroup *AuthGroupForName(AuthHash *r, const mDNSu32 slot, const mDNSu32 namehash, const domainname *const name);
-extern AuthGroup *AuthGroupForRecord(AuthHash *r, const mDNSu32 slot, const ResourceRecord *const rr);
-extern AuthGroup *InsertAuthRecord(mDNS *const m, AuthHash *r, AuthRecord *rr);
-extern AuthGroup *RemoveAuthRecord(mDNS *const m, AuthHash *r, AuthRecord *rr);
-
-// For now this AutoTunnel stuff is specific to Mac OS X.
-// In the future, if there's demand, we may see if we can abstract it out cleanly into the platform layer
-#if APPLE_OSX_mDNSResponder
-extern void AutoTunnelCallback(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord);
-extern void AddNewClientTunnel(mDNS *const m, DNSQuestion *const q);
-extern void SetupLocalAutoTunnelInterface_internal(mDNS *const m, mDNSBool servicesStarting);
-extern void UpdateAutoTunnelDomainStatuses(const mDNS *const m);
-extern mStatus ActivateLocalProxy(mDNS *const m, char *ifname);
-extern void RemoveAutoTunnel6Record(mDNS *const m);
-extern mDNSBool RecordReadyForSleep(mDNS *const m, AuthRecord *rr);
-#endif
-
-// ***************************************************************************
-#if 0
-#pragma mark -
-#pragma mark - Sleep Proxy
-#endif
-
-// Sleep Proxy Server Property Encoding
-//
-// Sleep Proxy Servers are advertised using a structured service name, consisting of four
-// metrics followed by a human-readable name. The metrics assist clients in deciding which
-// Sleep Proxy Server(s) to use when multiple are available on the network. Each metric
-// is a two-digit decimal number in the range 10-99. Lower metrics are generally better.
-//
-// AA-BB-CC-DD Name
-//
-// Metrics:
-//
-// AA = Intent
-// BB = Portability
-// CC = Marginal Power
-// DD = Total Power
-//
-//
-// ** Intent Metric **
-//
-// 20 = Dedicated Sleep Proxy Server -- a device, permanently powered on,
-// installed for the express purpose of providing Sleep Proxy Service.
-//
-// 30 = Primary Network Infrastructure Hardware -- a router, DHCP server, NAT gateway,
-// or similar permanently installed device which is permanently powered on.
-// This is hardware designed for the express purpose of being network
-// infrastructure, and for most home users is typically a single point
-// of failure for the local network -- e.g. most home users only have
-// a single NAT gateway / DHCP server. Even though in principle the
-// hardware might technically be capable of running different software,
-// a typical user is unlikely to do that. e.g. AirPort base station.
-//
-// 40 = Primary Network Infrastructure Software -- a general-purpose computer
-// (e.g. Mac, Windows, Linux, etc.) which is currently running DHCP server
-// or NAT gateway software, but the user could choose to turn that off
-// fairly easily. e.g. iMac running Internet Sharing
-//
-// 50 = Secondary Network Infrastructure Hardware -- like primary infrastructure
-// hardware, except not a single point of failure for the entire local network.
-// For example, an AirPort base station in bridge mode. This may have clients
-// associated with it, and if it goes away those clients will be inconvenienced,
-// but unlike the NAT gateway / DHCP server, the entire local network is not
-// dependent on it.
-//
-// 60 = Secondary Network Infrastructure Software -- like 50, but in a general-
-// purpose CPU.
-//
-// 70 = Incidentally Available Hardware -- a device which has no power switch
-// and is generally left powered on all the time. Even though it is not a
-// part of what we conventionally consider network infrastructure (router,
-// DHCP, NAT, DNS, etc.), and the rest of the network can operate fine
-// without it, since it's available and unlikely to be turned off, it is a
-// reasonable candidate for providing Sleep Proxy Service e.g. Apple TV,
-// or an AirPort base station in client mode, associated with an existing
-// wireless network (e.g. AirPort Express connected to a music system, or
-// being used to share a USB printer).
-//
-// 80 = Incidentally Available Software -- a general-purpose computer which
-// happens at this time to be set to "never sleep", and as such could be
-// useful as a Sleep Proxy Server, but has not been intentionally provided
-// for this purpose. Of all the Intent Metric categories this is the
-// one most likely to be shut down or put to sleep without warning.
-// However, if nothing else is availalable, it may be better than nothing.
-// e.g. Office computer in the workplace which has been set to "never sleep"
-//
-//
-// ** Portability Metric **
-//
-// Inversely related to mass of device, on the basis that, all other things
-// being equal, heavier devices are less likely to be moved than lighter devices.
-// E.g. A MacBook running Internet Sharing is probably more likely to be
-// put to sleep and taken away than a Mac Pro running Internet Sharing.
-// The Portability Metric is a logarithmic decibel scale, computed by taking the
-// (approximate) mass of the device in milligrammes, taking the base 10 logarithm
-// of that, multiplying by 10, and subtracting the result from 100:
-//
-// Portability Metric = 100 - (log10(mg) * 10)
-//
-// The Portability Metric is not necessarily computed literally from the actual
-// mass of the device; the intent is just that lower numbers indicate more
-// permanent devices, and higher numbers indicate devices more likely to be
-// removed from the network, e.g., in order of increasing portability:
-//
-// Mac Pro < iMac < Laptop < iPhone
-//
-// Example values:
-//
-// 10 = 1 metric tonne
-// 40 = 1kg
-// 70 = 1g
-// 90 = 10mg
-//
-//
-// ** Marginal Power and Total Power Metrics **
-//
-// The Marginal Power Metric is the power difference between sleeping and staying awake
-// to be a Sleep Proxy Server.
-//
-// The Total Power Metric is the total power consumption when being Sleep Proxy Server.
-//
-// The Power Metrics use a logarithmic decibel scale, computed as ten times the
-// base 10 logarithm of the (approximate) power in microwatts:
-//
-// Power Metric = log10(uW) * 10
-//
-// Higher values indicate higher power consumption. Example values:
-//
-// 10 = 10 uW
-// 20 = 100 uW
-// 30 = 1 mW
-// 60 = 1 W
-// 90 = 1 kW
-
-typedef enum
- {
- mDNSSleepProxyMetric_Dedicated = 20,
- mDNSSleepProxyMetric_PrimaryHardware = 30,
- mDNSSleepProxyMetric_PrimarySoftware = 40,
- mDNSSleepProxyMetric_SecondaryHardware = 50,
- mDNSSleepProxyMetric_SecondarySoftware = 60,
- mDNSSleepProxyMetric_IncidentalHardware = 70,
- mDNSSleepProxyMetric_IncidentalSoftware = 80
- } mDNSSleepProxyMetric;
-
-extern void mDNSCoreBeSleepProxyServer_internal(mDNS *const m, mDNSu8 sps, mDNSu8 port, mDNSu8 marginalpower, mDNSu8 totpower);
-#define mDNSCoreBeSleepProxyServer(M,S,P,MP,TP) \
- do { mDNS_Lock(m); mDNSCoreBeSleepProxyServer_internal((M),(S),(P),(MP),(TP)); mDNS_Unlock(m); } while(0)
-
-extern void FindSPSInCache(mDNS *const m, const DNSQuestion *const q, const CacheRecord *sps[3]);
-#define PrototypeSPSName(X) ((X)[0] >= 11 && (X)[3] == '-' && (X)[ 4] == '9' && (X)[ 5] == '9' && \
- (X)[6] == '-' && (X)[ 7] == '9' && (X)[ 8] == '9' && \
- (X)[9] == '-' && (X)[10] == '9' && (X)[11] == '9' )
-#define ValidSPSName(X) ((X)[0] >= 5 && mDNSIsDigit((X)[1]) && mDNSIsDigit((X)[2]) && mDNSIsDigit((X)[4]) && mDNSIsDigit((X)[5]))
-#define SPSMetric(X) (!ValidSPSName(X) || PrototypeSPSName(X) ? 1000000 : \
- ((X)[1]-'0') * 100000 + ((X)[2]-'0') * 10000 + ((X)[4]-'0') * 1000 + ((X)[5]-'0') * 100 + ((X)[7]-'0') * 10 + ((X)[8]-'0'))
-
-// ***************************************************************************
-#if 0
-#pragma mark -
-#pragma mark - Compile-Time assertion checks
-#endif
-
-// Some C compiler cleverness. We can make the compiler check certain things for
-// us, and report compile-time errors if anything is wrong. The usual way to do
-// this would be to use a run-time "if" statement, but then you don't find out
-// what's wrong until you run the software. This way, if the assertion condition
-// is false, the array size is negative, and the complier complains immediately.
-
-struct CompileTimeAssertionChecks_mDNS
- {
- // Check that the compiler generated our on-the-wire packet format structure definitions
- // properly packed, without adding padding bytes to align fields on 32-bit or 64-bit boundaries.
- char assert0[(sizeof(rdataSRV) == 262 ) ? 1 : -1];
- char assert1[(sizeof(DNSMessageHeader) == 12 ) ? 1 : -1];
- char assert2[(sizeof(DNSMessage) == 12+AbsoluteMaxDNSMessageData) ? 1 : -1];
- char assert3[(sizeof(mDNSs8) == 1 ) ? 1 : -1];
- char assert4[(sizeof(mDNSu8) == 1 ) ? 1 : -1];
- char assert5[(sizeof(mDNSs16) == 2 ) ? 1 : -1];
- char assert6[(sizeof(mDNSu16) == 2 ) ? 1 : -1];
- char assert7[(sizeof(mDNSs32) == 4 ) ? 1 : -1];
- char assert8[(sizeof(mDNSu32) == 4 ) ? 1 : -1];
- char assert9[(sizeof(mDNSOpaque16) == 2 ) ? 1 : -1];
- char assertA[(sizeof(mDNSOpaque32) == 4 ) ? 1 : -1];
- char assertB[(sizeof(mDNSOpaque128) == 16 ) ? 1 : -1];
- char assertC[(sizeof(CacheRecord ) == sizeof(CacheGroup) ) ? 1 : -1];
- char assertD[(sizeof(int) >= 4 ) ? 1 : -1];
- char assertE[(StandardAuthRDSize >= 256 ) ? 1 : -1];
- char assertF[(sizeof(EthernetHeader) == 14 ) ? 1 : -1];
- char assertG[(sizeof(ARP_EthIP ) == 28 ) ? 1 : -1];
- char assertH[(sizeof(IPv4Header ) == 20 ) ? 1 : -1];
- char assertI[(sizeof(IPv6Header ) == 40 ) ? 1 : -1];
- char assertJ[(sizeof(IPv6NDP ) == 24 ) ? 1 : -1];
- char assertK[(sizeof(UDPHeader ) == 8 ) ? 1 : -1];
- char assertL[(sizeof(IKEHeader ) == 28 ) ? 1 : -1];
- char assertM[(sizeof(TCPHeader ) == 20 ) ? 1 : -1];
-
- // Check our structures are reasonable sizes. Including overly-large buffers, or embedding
- // other overly-large structures instead of having a pointer to them, can inadvertently
- // cause structure sizes (and therefore memory usage) to balloon unreasonably.
- char sizecheck_RDataBody [(sizeof(RDataBody) == 264) ? 1 : -1];
- char sizecheck_ResourceRecord [(sizeof(ResourceRecord) <= 64) ? 1 : -1];
- char sizecheck_AuthRecord [(sizeof(AuthRecord) <= 1208) ? 1 : -1];
- char sizecheck_CacheRecord [(sizeof(CacheRecord) <= 184) ? 1 : -1];
- char sizecheck_CacheGroup [(sizeof(CacheGroup) <= 184) ? 1 : -1];
- char sizecheck_DNSQuestion [(sizeof(DNSQuestion) <= 786) ? 1 : -1];
- char sizecheck_ZoneData [(sizeof(ZoneData) <= 1624) ? 1 : -1];
- char sizecheck_NATTraversalInfo [(sizeof(NATTraversalInfo) <= 192) ? 1 : -1];
- char sizecheck_HostnameInfo [(sizeof(HostnameInfo) <= 3050) ? 1 : -1];
- char sizecheck_DNSServer [(sizeof(DNSServer) <= 328) ? 1 : -1];
- char sizecheck_NetworkInterfaceInfo[(sizeof(NetworkInterfaceInfo) <= 6850) ? 1 : -1];
- char sizecheck_ServiceRecordSet [(sizeof(ServiceRecordSet) <= 5500) ? 1 : -1];
- char sizecheck_DomainAuthInfo [(sizeof(DomainAuthInfo) <= 7808) ? 1 : -1];
- char sizecheck_ServiceInfoQuery [(sizeof(ServiceInfoQuery) <= 3200) ? 1 : -1];
-#if APPLE_OSX_mDNSResponder
- char sizecheck_ClientTunnel [(sizeof(ClientTunnel) <= 1148) ? 1 : -1];
-#endif
- };
-
-// ***************************************************************************
-
-#ifdef __cplusplus
- }
-#endif
-
-#endif
diff --git a/src/tools/mdnssd/mDNSPosix.c b/src/tools/mdnssd/mDNSPosix.c
deleted file mode 100755
index a1868709dbe..00000000000
--- a/src/tools/mdnssd/mDNSPosix.c
+++ /dev/null
@@ -1,1621 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2002-2004 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * Formatting notes:
- * This code follows the "Whitesmiths style" C indentation rules. Plenty of discussion
- * on C indentation can be found on the web, such as <http://www.kafejo.com/komp/1tbs.htm>,
- * but for the sake of brevity here I will say just this: Curly braces are not syntactially
- * part of an "if" statement; they are the beginning and ending markers of a compound statement;
- * therefore common sense dictates that if they are part of a compound statement then they
- * should be indented to the same level as everything else in that compound statement.
- * Indenting curly braces at the same level as the "if" implies that curly braces are
- * part of the "if", which is false. (This is as misleading as people who write "char* x,y;"
- * thinking that variables x and y are both of type "char*" -- and anyone who doesn't
- * understand why variable y is not of type "char*" just proves the point that poor code
- * layout leads people to unfortunate misunderstandings about how the C language really works.)
- */
-
-#include "mDNSEmbeddedAPI.h" // Defines the interface provided to the client layer above
-#include "DNSCommon.h"
-#include "mDNSPosix.h" // Defines the specific types needed to run mDNS on this platform
-#include "dns_sd.h"
-
-#include <assert.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <string.h>
-#include <unistd.h>
-#include <syslog.h>
-#include <stdarg.h>
-#include <fcntl.h>
-#include <sys/types.h>
-#include <sys/time.h>
-#include <sys/socket.h>
-#include <sys/uio.h>
-#include <sys/select.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <time.h> // platform support for UTC time
-
-#if USES_NETLINK
-#include <asm/types.h>
-#include <linux/netlink.h>
-#include <linux/rtnetlink.h>
-#else // USES_NETLINK
-#include <net/route.h>
-#include <net/if.h>
-#endif // USES_NETLINK
-
-#include "mDNSUNP.h"
-#include "GenLinkedList.h"
-
-// ***************************************************************************
-// Structures
-
-// We keep a list of client-supplied event sources in PosixEventSource records
-struct PosixEventSource
- {
- mDNSPosixEventCallback Callback;
- void *Context;
- int fd;
- struct PosixEventSource *Next;
- };
-typedef struct PosixEventSource PosixEventSource;
-
-// Context record for interface change callback
-struct IfChangeRec
- {
- int NotifySD;
- mDNS *mDNS;
- };
-typedef struct IfChangeRec IfChangeRec;
-
-// Note that static data is initialized to zero in (modern) C.
-static fd_set gEventFDs;
-static int gMaxFD; // largest fd in gEventFDs
-static GenLinkedList gEventSources; // linked list of PosixEventSource's
-static sigset_t gEventSignalSet; // Signals which event loop listens for
-static sigset_t gEventSignals; // Signals which were received while inside loop
-
-// ***************************************************************************
-// Globals (for debugging)
-
-static int num_registered_interfaces = 0;
-static int num_pkts_accepted = 0;
-static int num_pkts_rejected = 0;
-
-// ***************************************************************************
-// Functions
-
-int gMDNSPlatformPosixVerboseLevel = 0;
-
-#define PosixErrorToStatus(errNum) ((errNum) == 0 ? mStatus_NoError : mStatus_UnknownErr)
-
-mDNSlocal void SockAddrTomDNSAddr(const struct sockaddr *const sa, mDNSAddr *ipAddr, mDNSIPPort *ipPort)
- {
- switch (sa->sa_family)
- {
- case AF_INET:
- {
- struct sockaddr_in *sin = (struct sockaddr_in*)sa;
- ipAddr->type = mDNSAddrType_IPv4;
- ipAddr->ip.v4.NotAnInteger = sin->sin_addr.s_addr;
- if (ipPort) ipPort->NotAnInteger = sin->sin_port;
- break;
- }
-
-#if HAVE_IPV6
- case AF_INET6:
- {
- struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)sa;
-#ifndef NOT_HAVE_SA_LEN
- assert(sin6->sin6_len == sizeof(*sin6));
-#endif
- ipAddr->type = mDNSAddrType_IPv6;
- ipAddr->ip.v6 = *(mDNSv6Addr*)&sin6->sin6_addr;
- if (ipPort) ipPort->NotAnInteger = sin6->sin6_port;
- break;
- }
-#endif
-
- default:
- verbosedebugf("SockAddrTomDNSAddr: Uknown address family %d\n", sa->sa_family);
- ipAddr->type = mDNSAddrType_None;
- if (ipPort) ipPort->NotAnInteger = 0;
- break;
- }
- }
-
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark ***** Send and Receive
-#endif
-
-// mDNS core calls this routine when it needs to send a packet.
-mDNSexport mStatus mDNSPlatformSendUDP(const mDNS *const m, const void *const msg, const mDNSu8 *const end,
- mDNSInterfaceID InterfaceID, UDPSocket *src, const mDNSAddr *dst, mDNSIPPort dstPort)
- {
- int err = 0;
- struct sockaddr_storage to;
- PosixNetworkInterface * thisIntf = (PosixNetworkInterface *)(InterfaceID);
- int sendingsocket = -1;
-
- (void)src; // Will need to use this parameter once we implement mDNSPlatformUDPSocket/mDNSPlatformUDPClose
-
- assert(m != NULL);
- assert(msg != NULL);
- assert(end != NULL);
- assert((((char *) end) - ((char *) msg)) > 0);
-
- if (dstPort.NotAnInteger == 0)
- {
- LogMsg("mDNSPlatformSendUDP: Invalid argument -dstPort is set to 0");
- return PosixErrorToStatus(EINVAL);
- }
- if (dst->type == mDNSAddrType_IPv4)
- {
- struct sockaddr_in *sin = (struct sockaddr_in*)&to;
-#ifndef NOT_HAVE_SA_LEN
- sin->sin_len = sizeof(*sin);
-#endif
- sin->sin_family = AF_INET;
- sin->sin_port = dstPort.NotAnInteger;
- sin->sin_addr.s_addr = dst->ip.v4.NotAnInteger;
- sendingsocket = thisIntf ? thisIntf->multicastSocket4 : m->p->unicastSocket4;
- }
-
-#if HAVE_IPV6
- else if (dst->type == mDNSAddrType_IPv6)
- {
- struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)&to;
- mDNSPlatformMemZero(sin6, sizeof(*sin6));
-#ifndef NOT_HAVE_SA_LEN
- sin6->sin6_len = sizeof(*sin6);
-#endif
- sin6->sin6_family = AF_INET6;
- sin6->sin6_port = dstPort.NotAnInteger;
- sin6->sin6_addr = *(struct in6_addr*)&dst->ip.v6;
- sendingsocket = thisIntf ? thisIntf->multicastSocket6 : m->p->unicastSocket6;
- }
-#endif
-
- if (sendingsocket >= 0)
- err = sendto(sendingsocket, msg, (char*)end - (char*)msg, 0, (struct sockaddr *)&to, GET_SA_LEN(to));
-
- if (err > 0) err = 0;
- else if (err < 0)
- {
- static int MessageCount = 0;
- // Don't report EHOSTDOWN (i.e. ARP failure), ENETDOWN, or no route to host for unicast destinations
- if (!mDNSAddressIsAllDNSLinkGroup(dst))
- if (errno == EHOSTDOWN || errno == ENETDOWN || errno == EHOSTUNREACH || errno == ENETUNREACH) return(mStatus_TransientErr);
-
- if (MessageCount < 1000)
- {
- MessageCount++;
- if (thisIntf)
- LogMsg("mDNSPlatformSendUDP got error %d (%s) sending packet to %#a on interface %#a/%s/%d",
- errno, strerror(errno), dst, &thisIntf->coreIntf.ip, thisIntf->intfName, thisIntf->index);
- else
- LogMsg("mDNSPlatformSendUDP got error %d (%s) sending packet to %#a", errno, strerror(errno), dst);
- }
- }
-
- return PosixErrorToStatus(err);
- }
-
-// This routine is called when the main loop detects that data is available on a socket.
-mDNSlocal void SocketDataReady(mDNS *const m, PosixNetworkInterface *intf, int skt)
- {
- mDNSAddr senderAddr, destAddr;
- mDNSIPPort senderPort;
- ssize_t packetLen;
- DNSMessage packet;
- struct my_in_pktinfo packetInfo;
- struct sockaddr_storage from;
- socklen_t fromLen;
- int flags;
- mDNSu8 ttl;
- mDNSBool reject;
- const mDNSInterfaceID InterfaceID = intf ? intf->coreIntf.InterfaceID : NULL;
-
- assert(m != NULL);
- assert(skt >= 0);
-
- fromLen = sizeof(from);
- flags = 0;
- packetLen = recvfrom_flags(skt, &packet, sizeof(packet), &flags, (struct sockaddr *) &from, &fromLen, &packetInfo, &ttl);
-
- if (packetLen >= 0)
- {
- SockAddrTomDNSAddr((struct sockaddr*)&from, &senderAddr, &senderPort);
- SockAddrTomDNSAddr((struct sockaddr*)&packetInfo.ipi_addr, &destAddr, NULL);
-
- // If we have broken IP_RECVDSTADDR functionality (so far
- // I've only seen this on OpenBSD) then apply a hack to
- // convince mDNS Core that this isn't a spoof packet.
- // Basically what we do is check to see whether the
- // packet arrived as a multicast and, if so, set its
- // destAddr to the mDNS address.
- //
- // I must admit that I could just be doing something
- // wrong on OpenBSD and hence triggering this problem
- // but I'm at a loss as to how.
- //
- // If this platform doesn't have IP_PKTINFO or IP_RECVDSTADDR, then we have
- // no way to tell the destination address or interface this packet arrived on,
- // so all we can do is just assume it's a multicast
-
- #if HAVE_BROKEN_RECVDSTADDR || (!defined(IP_PKTINFO) && !defined(IP_RECVDSTADDR))
- if ((destAddr.NotAnInteger == 0) && (flags & MSG_MCAST))
- {
- destAddr.type = senderAddr.type;
- if (senderAddr.type == mDNSAddrType_IPv4) destAddr.ip.v4 = AllDNSLinkGroup_v4.ip.v4;
- else if (senderAddr.type == mDNSAddrType_IPv6) destAddr.ip.v6 = AllDNSLinkGroup_v6.ip.v6;
- }
- #endif
-
- // We only accept the packet if the interface on which it came
- // in matches the interface associated with this socket.
- // We do this match by name or by index, depending on which
- // information is available. recvfrom_flags sets the name
- // to "" if the name isn't available, or the index to -1
- // if the index is available. This accomodates the various
- // different capabilities of our target platforms.
-
- reject = mDNSfalse;
- if (!intf)
- {
- // Ignore multicasts accidentally delivered to our unicast receiving socket
- if (mDNSAddrIsDNSMulticast(&destAddr)) packetLen = -1;
- }
- else
- {
- if (packetInfo.ipi_ifname[0] != 0) reject = (strcmp(packetInfo.ipi_ifname, intf->intfName) != 0);
- else if (packetInfo.ipi_ifindex != -1) reject = (packetInfo.ipi_ifindex != intf->index);
-
- if (reject)
- {
- verbosedebugf("SocketDataReady ignored a packet from %#a to %#a on interface %s/%d expecting %#a/%s/%d/%d",
- &senderAddr, &destAddr, packetInfo.ipi_ifname, packetInfo.ipi_ifindex,
- &intf->coreIntf.ip, intf->intfName, intf->index, skt);
- packetLen = -1;
- num_pkts_rejected++;
- if (num_pkts_rejected > (num_pkts_accepted + 1) * (num_registered_interfaces + 1) * 2)
- {
- fprintf(stderr,
- "*** WARNING: Received %d packets; Accepted %d packets; Rejected %d packets because of interface mismatch\n",
- num_pkts_accepted + num_pkts_rejected, num_pkts_accepted, num_pkts_rejected);
- num_pkts_accepted = 0;
- num_pkts_rejected = 0;
- }
- }
- else
- {
- verbosedebugf("SocketDataReady got a packet from %#a to %#a on interface %#a/%s/%d/%d",
- &senderAddr, &destAddr, &intf->coreIntf.ip, intf->intfName, intf->index, skt);
- num_pkts_accepted++;
- }
- }
- }
-
- if (packetLen >= 0)
- mDNSCoreReceive(m, &packet, (mDNSu8 *)&packet + packetLen,
- &senderAddr, senderPort, &destAddr, MulticastDNSPort, InterfaceID);
- }
-
-mDNSexport TCPSocket *mDNSPlatformTCPSocket(mDNS * const m, TCPSocketFlags flags, mDNSIPPort * port)
- {
- (void)m; // Unused
- (void)flags; // Unused
- (void)port; // Unused
- return NULL;
- }
-
-mDNSexport TCPSocket *mDNSPlatformTCPAccept(TCPSocketFlags flags, int sd)
- {
- (void)flags; // Unused
- (void)sd; // Unused
- return NULL;
- }
-
-mDNSexport int mDNSPlatformTCPGetFD(TCPSocket *sock)
- {
- (void)sock; // Unused
- return -1;
- }
-
-mDNSexport mStatus mDNSPlatformTCPConnect(TCPSocket *sock, const mDNSAddr *dst, mDNSOpaque16 dstport, domainname *hostname, mDNSInterfaceID InterfaceID,
- TCPConnectionCallback callback, void *context)
- {
- (void)sock; // Unused
- (void)dst; // Unused
- (void)dstport; // Unused
- (void)hostname; // Unused
- (void)InterfaceID; // Unused
- (void)callback; // Unused
- (void)context; // Unused
- return(mStatus_UnsupportedErr);
- }
-
-mDNSexport void mDNSPlatformTCPCloseConnection(TCPSocket *sock)
- {
- (void)sock; // Unused
- }
-
-mDNSexport long mDNSPlatformReadTCP(TCPSocket *sock, void *buf, unsigned long buflen, mDNSBool * closed)
- {
- (void)sock; // Unused
- (void)buf; // Unused
- (void)buflen; // Unused
- (void)closed; // Unused
- return 0;
- }
-
-mDNSexport long mDNSPlatformWriteTCP(TCPSocket *sock, const char *msg, unsigned long len)
- {
- (void)sock; // Unused
- (void)msg; // Unused
- (void)len; // Unused
- return 0;
- }
-
-mDNSexport UDPSocket *mDNSPlatformUDPSocket(mDNS * const m, mDNSIPPort port)
- {
- (void)m; // Unused
- (void)port; // Unused
- return NULL;
- }
-
-mDNSexport void mDNSPlatformUDPClose(UDPSocket *sock)
- {
- (void)sock; // Unused
- }
-
-mDNSexport void mDNSPlatformUpdateProxyList(mDNS *const m, const mDNSInterfaceID InterfaceID)
- {
- (void)m; // Unused
- (void)InterfaceID; // Unused
- }
-
-mDNSexport void mDNSPlatformSendRawPacket(const void *const msg, const mDNSu8 *const end, mDNSInterfaceID InterfaceID)
- {
- (void)msg; // Unused
- (void)end; // Unused
- (void)InterfaceID; // Unused
- }
-
-mDNSexport void mDNSPlatformSetLocalAddressCacheEntry(mDNS *const m, const mDNSAddr *const tpa, const mDNSEthAddr *const tha, mDNSInterfaceID InterfaceID)
- {
- (void)m; // Unused
- (void)tpa; // Unused
- (void)tha; // Unused
- (void)InterfaceID; // Unused
- }
-
-mDNSexport mStatus mDNSPlatformTLSSetupCerts(void)
- {
- return(mStatus_UnsupportedErr);
- }
-
-mDNSexport void mDNSPlatformTLSTearDownCerts(void)
- {
- }
-
-mDNSexport void mDNSPlatformSetAllowSleep(mDNS *const m, mDNSBool allowSleep, const char *reason)
- {
- (void) m;
- (void) allowSleep;
- (void) reason;
- }
-
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - /etc/hosts support
-#endif
-
-mDNSexport void FreeEtcHosts(mDNS *const m, AuthRecord *const rr, mStatus result)
- {
- (void)m; // unused
- (void)rr;
- (void)result;
- }
-
-
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark ***** DDNS Config Platform Functions
-#endif
-
-mDNSexport void mDNSPlatformSetDNSConfig(mDNS *const m, mDNSBool setservers, mDNSBool setsearch, domainname *const fqdn, DNameListElem **RegDomains, DNameListElem **BrowseDomains)
- {
- (void) m;
- (void) setservers;
- (void) fqdn;
- (void) setsearch;
- (void) RegDomains;
- (void) BrowseDomains;
- }
-
-mDNSexport mStatus mDNSPlatformGetPrimaryInterface(mDNS * const m, mDNSAddr * v4, mDNSAddr * v6, mDNSAddr * router)
- {
- (void) m;
- (void) v4;
- (void) v6;
- (void) router;
-
- return mStatus_UnsupportedErr;
- }
-
-mDNSexport void mDNSPlatformDynDNSHostNameStatusChanged(const domainname *const dname, const mStatus status)
- {
- (void) dname;
- (void) status;
- }
-
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark ***** Init and Term
-#endif
-
-// This gets the current hostname, truncating it at the first dot if necessary
-mDNSlocal void GetUserSpecifiedRFC1034ComputerName(domainlabel *const namelabel)
- {
- int len = 0;
- gethostname((char *)(&namelabel->c[1]), MAX_DOMAIN_LABEL);
- while (len < MAX_DOMAIN_LABEL && namelabel->c[len+1] && namelabel->c[len+1] != '.') len++;
- namelabel->c[0] = len;
- }
-
-// On OS X this gets the text of the field labelled "Computer Name" in the Sharing Prefs Control Panel
-// Other platforms can either get the information from the appropriate place,
-// or they can alternatively just require all registering services to provide an explicit name
-mDNSlocal void GetUserSpecifiedFriendlyComputerName(domainlabel *const namelabel)
- {
- // On Unix we have no better name than the host name, so we just use that.
- GetUserSpecifiedRFC1034ComputerName(namelabel);
- }
-
-mDNSexport int ParseDNSServers(mDNS *m, const char *filePath)
- {
- char line[256];
- char nameserver[16];
- char keyword[10];
- int numOfServers = 0;
- FILE *fp = fopen(filePath, "r");
- if (fp == NULL) return -1;
- while (fgets(line,sizeof(line),fp))
- {
- struct in_addr ina;
- line[255]='\0'; // just to be safe
- if (sscanf(line,"%10s %15s", keyword, nameserver) != 2) continue; // it will skip whitespaces
- if (strncasecmp(keyword,"nameserver",10)) continue;
- if (inet_aton(nameserver, (struct in_addr *)&ina) != 0)
- {
- mDNSAddr DNSAddr;
- DNSAddr.type = mDNSAddrType_IPv4;
- DNSAddr.ip.v4.NotAnInteger = ina.s_addr;
- mDNS_AddDNSServer(m, NULL, mDNSInterface_Any, &DNSAddr, UnicastDNSPort, mDNSfalse, 0, mDNSfalse);
- numOfServers++;
- }
- }
- return (numOfServers > 0) ? 0 : -1;
- }
-
-// Searches the interface list looking for the named interface.
-// Returns a pointer to if it found, or NULL otherwise.
-mDNSlocal PosixNetworkInterface *SearchForInterfaceByName(mDNS *const m, const char *intfName)
- {
- PosixNetworkInterface *intf;
-
- assert(m != NULL);
- assert(intfName != NULL);
-
- intf = (PosixNetworkInterface*)(m->HostInterfaces);
- while ((intf != NULL) && (strcmp(intf->intfName, intfName) != 0))
- intf = (PosixNetworkInterface *)(intf->coreIntf.next);
-
- return intf;
- }
-
-mDNSexport mDNSInterfaceID mDNSPlatformInterfaceIDfromInterfaceIndex(mDNS *const m, mDNSu32 index)
- {
- PosixNetworkInterface *intf;
-
- assert(m != NULL);
-
- if (index == kDNSServiceInterfaceIndexLocalOnly) return(mDNSInterface_LocalOnly);
- if (index == kDNSServiceInterfaceIndexP2P ) return(mDNSInterface_P2P);
- if (index == kDNSServiceInterfaceIndexAny ) return(mDNSInterface_Any);
-
- intf = (PosixNetworkInterface*)(m->HostInterfaces);
- while ((intf != NULL) && (mDNSu32) intf->index != index)
- intf = (PosixNetworkInterface *)(intf->coreIntf.next);
-
- return (mDNSInterfaceID) intf;
- }
-
-mDNSexport mDNSu32 mDNSPlatformInterfaceIndexfromInterfaceID(mDNS *const m, mDNSInterfaceID id, mDNSBool suppressNetworkChange)
- {
- PosixNetworkInterface *intf;
- (void) suppressNetworkChange; // Unused
-
- assert(m != NULL);
-
- if (id == mDNSInterface_LocalOnly) return(kDNSServiceInterfaceIndexLocalOnly);
- if (id == mDNSInterface_P2P ) return(kDNSServiceInterfaceIndexP2P);
- if (id == mDNSInterface_Any ) return(kDNSServiceInterfaceIndexAny);
-
- intf = (PosixNetworkInterface*)(m->HostInterfaces);
- while ((intf != NULL) && (mDNSInterfaceID) intf != id)
- intf = (PosixNetworkInterface *)(intf->coreIntf.next);
-
- return intf ? intf->index : 0;
- }
-
-// Frees the specified PosixNetworkInterface structure. The underlying
-// interface must have already been deregistered with the mDNS core.
-mDNSlocal void FreePosixNetworkInterface(PosixNetworkInterface *intf)
- {
- assert(intf != NULL);
- if (intf->intfName != NULL) free((void *)intf->intfName);
- if (intf->multicastSocket4 != -1) assert(close(intf->multicastSocket4) == 0);
-#if HAVE_IPV6
- if (intf->multicastSocket6 != -1) assert(close(intf->multicastSocket6) == 0);
-#endif
- free(intf);
- }
-
-// Grab the first interface, deregister it, free it, and repeat until done.
-mDNSlocal void ClearInterfaceList(mDNS *const m)
- {
- assert(m != NULL);
-
- while (m->HostInterfaces)
- {
- PosixNetworkInterface *intf = (PosixNetworkInterface*)(m->HostInterfaces);
- mDNS_DeregisterInterface(m, &intf->coreIntf, mDNSfalse);
- if (gMDNSPlatformPosixVerboseLevel > 0) fprintf(stderr, "Deregistered interface %s\n", intf->intfName);
- FreePosixNetworkInterface(intf);
- }
- num_registered_interfaces = 0;
- num_pkts_accepted = 0;
- num_pkts_rejected = 0;
- }
-
-// Sets up a send/receive socket.
-// If mDNSIPPort port is non-zero, then it's a multicast socket on the specified interface
-// If mDNSIPPort port is zero, then it's a randomly assigned port number, used for sending unicast queries
-mDNSlocal int SetupSocket(struct sockaddr *intfAddr, mDNSIPPort port, int interfaceIndex, int *sktPtr)
- {
- int err = 0;
- static const int kOn = 1;
- static const int kIntTwoFiveFive = 255;
- static const unsigned char kByteTwoFiveFive = 255;
- const mDNSBool JoinMulticastGroup = (port.NotAnInteger != 0);
-
- (void) interfaceIndex; // This parameter unused on plaforms that don't have IPv6
- assert(intfAddr != NULL);
- assert(sktPtr != NULL);
- assert(*sktPtr == -1);
-
- // Open the socket...
- if (intfAddr->sa_family == AF_INET) *sktPtr = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
-#if HAVE_IPV6
- else if (intfAddr->sa_family == AF_INET6) *sktPtr = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
-#endif
- else return EINVAL;
-
- if (*sktPtr < 0) { err = errno; perror((intfAddr->sa_family == AF_INET) ? "socket AF_INET" : "socket AF_INET6"); }
-
- // ... with a shared UDP port, if it's for multicast receiving
- if (err == 0 && port.NotAnInteger)
- {
- #if defined(SO_REUSEPORT)
- err = setsockopt(*sktPtr, SOL_SOCKET, SO_REUSEPORT, &kOn, sizeof(kOn));
- #elif defined(SO_REUSEADDR)
- err = setsockopt(*sktPtr, SOL_SOCKET, SO_REUSEADDR, &kOn, sizeof(kOn));
- #else
- #error This platform has no way to avoid address busy errors on multicast.
- #endif
- if (err < 0) { err = errno; perror("setsockopt - SO_REUSExxxx"); }
- }
-
- // We want to receive destination addresses and interface identifiers.
- if (intfAddr->sa_family == AF_INET)
- {
- struct ip_mreq imr;
- struct sockaddr_in bindAddr;
- if (err == 0)
- {
- #if defined(IP_PKTINFO) // Linux
- err = setsockopt(*sktPtr, IPPROTO_IP, IP_PKTINFO, &kOn, sizeof(kOn));
- if (err < 0) { err = errno; perror("setsockopt - IP_PKTINFO"); }
- #elif defined(IP_RECVDSTADDR) || defined(IP_RECVIF) // BSD and Solaris
- #if defined(IP_RECVDSTADDR)
- err = setsockopt(*sktPtr, IPPROTO_IP, IP_RECVDSTADDR, &kOn, sizeof(kOn));
- if (err < 0) { err = errno; perror("setsockopt - IP_RECVDSTADDR"); }
- #endif
- #if defined(IP_RECVIF)
- if (err == 0)
- {
- err = setsockopt(*sktPtr, IPPROTO_IP, IP_RECVIF, &kOn, sizeof(kOn));
- if (err < 0) { err = errno; perror("setsockopt - IP_RECVIF"); }
- }
- #endif
- #else
- #warning This platform has no way to get the destination interface information -- will only work for single-homed hosts
- #endif
- }
- #if defined(IP_RECVTTL) // Linux
- if (err == 0)
- {
- setsockopt(*sktPtr, IPPROTO_IP, IP_RECVTTL, &kOn, sizeof(kOn));
- // We no longer depend on being able to get the received TTL, so don't worry if the option fails
- }
- #endif
-
- // Add multicast group membership on this interface
- if (err == 0 && JoinMulticastGroup)
- {
- imr.imr_multiaddr.s_addr = AllDNSLinkGroup_v4.ip.v4.NotAnInteger;
- imr.imr_interface = ((struct sockaddr_in*)intfAddr)->sin_addr;
- err = setsockopt(*sktPtr, IPPROTO_IP, IP_ADD_MEMBERSHIP, &imr, sizeof(imr));
- if (err < 0) { err = errno; perror("setsockopt - IP_ADD_MEMBERSHIP"); }
- }
-
- // Specify outgoing interface too
- if (err == 0 && JoinMulticastGroup)
- {
- err = setsockopt(*sktPtr, IPPROTO_IP, IP_MULTICAST_IF, &((struct sockaddr_in*)intfAddr)->sin_addr, sizeof(struct in_addr));
- if (err < 0) { err = errno; perror("setsockopt - IP_MULTICAST_IF"); }
- }
-
- // Per the mDNS spec, send unicast packets with TTL 255
- if (err == 0)
- {
- err = setsockopt(*sktPtr, IPPROTO_IP, IP_TTL, &kIntTwoFiveFive, sizeof(kIntTwoFiveFive));
- if (err < 0) { err = errno; perror("setsockopt - IP_TTL"); }
- }
-
- // and multicast packets with TTL 255 too
- // There's some debate as to whether IP_MULTICAST_TTL is an int or a byte so we just try both.
- if (err == 0)
- {
- err = setsockopt(*sktPtr, IPPROTO_IP, IP_MULTICAST_TTL, &kByteTwoFiveFive, sizeof(kByteTwoFiveFive));
- if (err < 0 && errno == EINVAL)
- err = setsockopt(*sktPtr, IPPROTO_IP, IP_MULTICAST_TTL, &kIntTwoFiveFive, sizeof(kIntTwoFiveFive));
- if (err < 0) { err = errno; perror("setsockopt - IP_MULTICAST_TTL"); }
- }
-
- // And start listening for packets
- if (err == 0)
- {
- bindAddr.sin_family = AF_INET;
- bindAddr.sin_port = port.NotAnInteger;
- bindAddr.sin_addr.s_addr = INADDR_ANY; // Want to receive multicasts AND unicasts on this socket
- err = bind(*sktPtr, (struct sockaddr *) &bindAddr, sizeof(bindAddr));
- if (err < 0) { err = errno; perror("bind"); fflush(stderr); }
- }
- } // endif (intfAddr->sa_family == AF_INET)
-
-#if HAVE_IPV6
- else if (intfAddr->sa_family == AF_INET6)
- {
- struct ipv6_mreq imr6;
- struct sockaddr_in6 bindAddr6;
-#if defined(IPV6_PKTINFO)
- if (err == 0)
- {
- err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_2292_PKTINFO, &kOn, sizeof(kOn));
- if (err < 0) { err = errno; perror("setsockopt - IPV6_PKTINFO"); }
- }
- #else
- #warning This platform has no way to get the destination interface information for IPv6 -- will only work for single-homed hosts
- #endif
- #if defined(IPV6_HOPLIMIT)
- if (err == 0)
- {
- err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_2292_HOPLIMIT, &kOn, sizeof(kOn));
- if (err < 0) { err = errno; perror("setsockopt - IPV6_HOPLIMIT"); }
- }
- #endif
-
- // Add multicast group membership on this interface
- if (err == 0 && JoinMulticastGroup)
- {
- imr6.ipv6mr_multiaddr = *(const struct in6_addr*)&AllDNSLinkGroup_v6.ip.v6;
- imr6.ipv6mr_interface = interfaceIndex;
- //LogMsg("Joining %.16a on %d", &imr6.ipv6mr_multiaddr, imr6.ipv6mr_interface);
- err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_JOIN_GROUP, &imr6, sizeof(imr6));
- if (err < 0)
- {
- err = errno;
- verbosedebugf("IPV6_JOIN_GROUP %.16a on %d failed.\n", &imr6.ipv6mr_multiaddr, imr6.ipv6mr_interface);
- perror("setsockopt - IPV6_JOIN_GROUP");
- }
- }
-
- // Specify outgoing interface too
- if (err == 0 && JoinMulticastGroup)
- {
- u_int multicast_if = interfaceIndex;
- err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_MULTICAST_IF, &multicast_if, sizeof(multicast_if));
- if (err < 0) { err = errno; perror("setsockopt - IPV6_MULTICAST_IF"); }
- }
-
- // We want to receive only IPv6 packets on this socket.
- // Without this option, we may get IPv4 addresses as mapped addresses.
- if (err == 0)
- {
- err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_V6ONLY, &kOn, sizeof(kOn));
- if (err < 0) { err = errno; perror("setsockopt - IPV6_V6ONLY"); }
- }
-
- // Per the mDNS spec, send unicast packets with TTL 255
- if (err == 0)
- {
- err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &kIntTwoFiveFive, sizeof(kIntTwoFiveFive));
- if (err < 0) { err = errno; perror("setsockopt - IPV6_UNICAST_HOPS"); }
- }
-
- // and multicast packets with TTL 255 too
- // There's some debate as to whether IPV6_MULTICAST_HOPS is an int or a byte so we just try both.
- if (err == 0)
- {
- err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &kByteTwoFiveFive, sizeof(kByteTwoFiveFive));
- if (err < 0 && errno == EINVAL)
- err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &kIntTwoFiveFive, sizeof(kIntTwoFiveFive));
- if (err < 0) { err = errno; perror("setsockopt - IPV6_MULTICAST_HOPS"); }
- }
-
- // And start listening for packets
- if (err == 0)
- {
- mDNSPlatformMemZero(&bindAddr6, sizeof(bindAddr6));
-#ifndef NOT_HAVE_SA_LEN
- bindAddr6.sin6_len = sizeof(bindAddr6);
-#endif
- bindAddr6.sin6_family = AF_INET6;
- bindAddr6.sin6_port = port.NotAnInteger;
- bindAddr6.sin6_flowinfo = 0;
- bindAddr6.sin6_addr = in6addr_any; // Want to receive multicasts AND unicasts on this socket
- bindAddr6.sin6_scope_id = 0;
- err = bind(*sktPtr, (struct sockaddr *) &bindAddr6, sizeof(bindAddr6));
- if (err < 0) { err = errno; perror("bind"); fflush(stderr); }
- }
- } // endif (intfAddr->sa_family == AF_INET6)
-#endif
-
- // Set the socket to non-blocking.
- if (err == 0)
- {
- err = fcntl(*sktPtr, F_GETFL, 0);
- if (err < 0) err = errno;
- else
- {
- err = fcntl(*sktPtr, F_SETFL, err | O_NONBLOCK);
- if (err < 0) err = errno;
- }
- }
-
- // Clean up
- if (err != 0 && *sktPtr != -1) { assert(close(*sktPtr) == 0); *sktPtr = -1; }
- assert((err == 0) == (*sktPtr != -1));
- return err;
- }
-
-// Creates a PosixNetworkInterface for the interface whose IP address is
-// intfAddr and whose name is intfName and registers it with mDNS core.
-mDNSlocal int SetupOneInterface(mDNS *const m, struct sockaddr *intfAddr, struct sockaddr *intfMask, const char *intfName, int intfIndex)
- {
- int err = 0;
- PosixNetworkInterface *intf;
- PosixNetworkInterface *alias = NULL;
-
- assert(m != NULL);
- assert(intfAddr != NULL);
- assert(intfName != NULL);
- assert(intfMask != NULL);
-
- // Allocate the interface structure itself.
- intf = (PosixNetworkInterface*)malloc(sizeof(*intf));
- if (intf == NULL) { assert(0); err = ENOMEM; }
-
- // And make a copy of the intfName.
- if (err == 0)
- {
- intf->intfName = strdup(intfName);
- if (intf->intfName == NULL) { assert(0); err = ENOMEM; }
- }
-
- if (err == 0)
- {
- // Set up the fields required by the mDNS core.
- SockAddrTomDNSAddr(intfAddr, &intf->coreIntf.ip, NULL);
- SockAddrTomDNSAddr(intfMask, &intf->coreIntf.mask, NULL);
-
- //LogMsg("SetupOneInterface: %#a %#a", &intf->coreIntf.ip, &intf->coreIntf.mask);
- strncpy(intf->coreIntf.ifname, intfName, sizeof(intf->coreIntf.ifname));
- intf->coreIntf.ifname[sizeof(intf->coreIntf.ifname)-1] = 0;
- intf->coreIntf.Advertise = m->AdvertiseLocalAddresses;
- intf->coreIntf.McastTxRx = mDNStrue;
-
- // Set up the extra fields in PosixNetworkInterface.
- assert(intf->intfName != NULL); // intf->intfName already set up above
- intf->index = intfIndex;
- intf->multicastSocket4 = -1;
-#if HAVE_IPV6
- intf->multicastSocket6 = -1;
-#endif
- alias = SearchForInterfaceByName(m, intf->intfName);
- if (alias == NULL) alias = intf;
- intf->coreIntf.InterfaceID = (mDNSInterfaceID)alias;
-
- if (alias != intf)
- debugf("SetupOneInterface: %s %#a is an alias of %#a", intfName, &intf->coreIntf.ip, &alias->coreIntf.ip);
- }
-
- // Set up the multicast socket
- if (err == 0)
- {
- if (alias->multicastSocket4 == -1 && intfAddr->sa_family == AF_INET)
- err = SetupSocket(intfAddr, MulticastDNSPort, intf->index, &alias->multicastSocket4);
-#if HAVE_IPV6
- else if (alias->multicastSocket6 == -1 && intfAddr->sa_family == AF_INET6)
- err = SetupSocket(intfAddr, MulticastDNSPort, intf->index, &alias->multicastSocket6);
-#endif
- }
-
- // The interface is all ready to go, let's register it with the mDNS core.
- if (err == 0)
- err = mDNS_RegisterInterface(m, &intf->coreIntf, mDNSfalse);
-
- // Clean up.
- if (err == 0)
- {
- num_registered_interfaces++;
- debugf("SetupOneInterface: %s %#a Registered", intf->intfName, &intf->coreIntf.ip);
- if (gMDNSPlatformPosixVerboseLevel > 0)
- fprintf(stderr, "Registered interface %s\n", intf->intfName);
- }
- else
- {
- // Use intfName instead of intf->intfName in the next line to avoid dereferencing NULL.
- debugf("SetupOneInterface: %s %#a failed to register %d", intfName, &intf->coreIntf.ip, err);
- if (intf) { FreePosixNetworkInterface(intf); intf = NULL; }
- }
-
- assert((err == 0) == (intf != NULL));
-
- return err;
- }
-
-// Call get_ifi_info() to obtain a list of active interfaces and call SetupOneInterface() on each one.
-mDNSlocal int SetupInterfaceList(mDNS *const m)
- {
- mDNSBool foundav4 = mDNSfalse;
- int err = 0;
- struct ifi_info *intfList = get_ifi_info(AF_INET, mDNStrue);
- struct ifi_info *firstLoopback = NULL;
-
- assert(m != NULL);
- debugf("SetupInterfaceList");
-
- if (intfList == NULL) err = ENOENT;
-
-#if HAVE_IPV6
- if (err == 0) /* Link the IPv6 list to the end of the IPv4 list */
- {
- struct ifi_info **p = &intfList;
- while (*p) p = &(*p)->ifi_next;
- *p = get_ifi_info(AF_INET6, mDNStrue);
- }
-#endif
-
- if (err == 0)
- {
- struct ifi_info *i = intfList;
- while (i)
- {
- if ( ((i->ifi_addr->sa_family == AF_INET)
-#if HAVE_IPV6
- || (i->ifi_addr->sa_family == AF_INET6)
-#endif
- ) && (i->ifi_flags & IFF_UP) && !(i->ifi_flags & IFF_POINTOPOINT))
- {
- if (i->ifi_flags & IFF_LOOPBACK)
- {
- if (firstLoopback == NULL)
- firstLoopback = i;
- }
- else
- {
- if (SetupOneInterface(m, i->ifi_addr, i->ifi_netmask, i->ifi_name, i->ifi_index) == 0)
- if (i->ifi_addr->sa_family == AF_INET)
- foundav4 = mDNStrue;
- }
- }
- i = i->ifi_next;
- }
-
- // If we found no normal interfaces but we did find a loopback interface, register the
- // loopback interface. This allows self-discovery if no interfaces are configured.
- // Temporary workaround: Multicast loopback on IPv6 interfaces appears not to work.
- // In the interim, we skip loopback interface only if we found at least one v4 interface to use
- // if ((m->HostInterfaces == NULL) && (firstLoopback != NULL))
- if (!foundav4 && firstLoopback)
- (void) SetupOneInterface(m, firstLoopback->ifi_addr, firstLoopback->ifi_netmask, firstLoopback->ifi_name, firstLoopback->ifi_index);
- }
-
- // Clean up.
- if (intfList != NULL) free_ifi_info(intfList);
- return err;
- }
-
-#if USES_NETLINK
-
-// See <http://www.faqs.org/rfcs/rfc3549.html> for a description of NetLink
-
-// Open a socket that will receive interface change notifications
-mDNSlocal mStatus OpenIfNotifySocket(int *pFD)
- {
- mStatus err = mStatus_NoError;
- struct sockaddr_nl snl;
- int sock;
- int ret;
-
- sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
- if (sock < 0)
- return errno;
-
- // Configure read to be non-blocking because inbound msg size is not known in advance
- (void) fcntl(sock, F_SETFL, O_NONBLOCK);
-
- /* Subscribe the socket to Link & IP addr notifications. */
- mDNSPlatformMemZero(&snl, sizeof snl);
- snl.nl_family = AF_NETLINK;
- snl.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR;
- ret = bind(sock, (struct sockaddr *) &snl, sizeof snl);
- if (0 == ret)
- *pFD = sock;
- else
- err = errno;
-
- return err;
- }
-
-#if MDNS_DEBUGMSGS
-mDNSlocal void PrintNetLinkMsg(const struct nlmsghdr *pNLMsg)
- {
- const char *kNLMsgTypes[] = { "", "NLMSG_NOOP", "NLMSG_ERROR", "NLMSG_DONE", "NLMSG_OVERRUN" };
- const char *kNLRtMsgTypes[] = { "RTM_NEWLINK", "RTM_DELLINK", "RTM_GETLINK", "RTM_NEWADDR", "RTM_DELADDR", "RTM_GETADDR" };
-
- printf("nlmsghdr len=%d, type=%s, flags=0x%x\n", pNLMsg->nlmsg_len,
- pNLMsg->nlmsg_type < RTM_BASE ? kNLMsgTypes[pNLMsg->nlmsg_type] : kNLRtMsgTypes[pNLMsg->nlmsg_type - RTM_BASE],
- pNLMsg->nlmsg_flags);
-
- if (RTM_NEWLINK <= pNLMsg->nlmsg_type && pNLMsg->nlmsg_type <= RTM_GETLINK)
- {
- struct ifinfomsg *pIfInfo = (struct ifinfomsg*) NLMSG_DATA(pNLMsg);
- printf("ifinfomsg family=%d, type=%d, index=%d, flags=0x%x, change=0x%x\n", pIfInfo->ifi_family,
- pIfInfo->ifi_type, pIfInfo->ifi_index, pIfInfo->ifi_flags, pIfInfo->ifi_change);
-
- }
- else if (RTM_NEWADDR <= pNLMsg->nlmsg_type && pNLMsg->nlmsg_type <= RTM_GETADDR)
- {
- struct ifaddrmsg *pIfAddr = (struct ifaddrmsg*) NLMSG_DATA(pNLMsg);
- printf("ifaddrmsg family=%d, index=%d, flags=0x%x\n", pIfAddr->ifa_family,
- pIfAddr->ifa_index, pIfAddr->ifa_flags);
- }
- printf("\n");
- }
-#endif
-
-mDNSlocal mDNSu32 ProcessRoutingNotification(int sd)
-// Read through the messages on sd and if any indicate that any interface records should
-// be torn down and rebuilt, return affected indices as a bitmask. Otherwise return 0.
- {
- ssize_t readCount;
- char buff[4096];
- struct nlmsghdr *pNLMsg = (struct nlmsghdr*) buff;
- mDNSu32 result = 0;
-
- // The structure here is more complex than it really ought to be because,
- // unfortunately, there's no good way to size a buffer in advance large
- // enough to hold all pending data and so avoid message fragmentation.
- // (Note that FIONREAD is not supported on AF_NETLINK.)
-
- readCount = read(sd, buff, sizeof buff);
- while (1)
- {
- // Make sure we've got an entire nlmsghdr in the buffer, and payload, too.
- // If not, discard already-processed messages in buffer and read more data.
- if (((char*) &pNLMsg[1] > (buff + readCount)) || // i.e. *pNLMsg extends off end of buffer
- ((char*) pNLMsg + pNLMsg->nlmsg_len > (buff + readCount)))
- {
- if (buff < (char*) pNLMsg) // we have space to shuffle
- {
- // discard processed data
- readCount -= ((char*) pNLMsg - buff);
- memmove(buff, pNLMsg, readCount);
- pNLMsg = (struct nlmsghdr*) buff;
-
- // read more data
- readCount += read(sd, buff + readCount, sizeof buff - readCount);
- continue; // spin around and revalidate with new readCount
- }
- else
- break; // Otherwise message does not fit in buffer
- }
-
-#if MDNS_DEBUGMSGS
- PrintNetLinkMsg(pNLMsg);
-#endif
-
- // Process the NetLink message
- if (pNLMsg->nlmsg_type == RTM_GETLINK || pNLMsg->nlmsg_type == RTM_NEWLINK)
- result |= 1 << ((struct ifinfomsg*) NLMSG_DATA(pNLMsg))->ifi_index;
- else if (pNLMsg->nlmsg_type == RTM_DELADDR || pNLMsg->nlmsg_type == RTM_NEWADDR)
- result |= 1 << ((struct ifaddrmsg*) NLMSG_DATA(pNLMsg))->ifa_index;
-
- // Advance pNLMsg to the next message in the buffer
- if ((pNLMsg->nlmsg_flags & NLM_F_MULTI) != 0 && pNLMsg->nlmsg_type != NLMSG_DONE)
- {
- ssize_t len = readCount - ((char*)pNLMsg - buff);
- pNLMsg = NLMSG_NEXT(pNLMsg, len);
- }
- else
- break; // all done!
- }
-
- return result;
- }
-
-#else // USES_NETLINK
-
-// Open a socket that will receive interface change notifications
-mDNSlocal mStatus OpenIfNotifySocket(int *pFD)
- {
- *pFD = socket(AF_ROUTE, SOCK_RAW, 0);
-
- if (*pFD < 0)
- return mStatus_UnknownErr;
-
- // Configure read to be non-blocking because inbound msg size is not known in advance
- (void) fcntl(*pFD, F_SETFL, O_NONBLOCK);
-
- return mStatus_NoError;
- }
-
-#if MDNS_DEBUGMSGS
-mDNSlocal void PrintRoutingSocketMsg(const struct ifa_msghdr *pRSMsg)
- {
- const char *kRSMsgTypes[] = { "", "RTM_ADD", "RTM_DELETE", "RTM_CHANGE", "RTM_GET", "RTM_LOSING",
- "RTM_REDIRECT", "RTM_MISS", "RTM_LOCK", "RTM_OLDADD", "RTM_OLDDEL", "RTM_RESOLVE",
- "RTM_NEWADDR", "RTM_DELADDR", "RTM_IFINFO", "RTM_NEWMADDR", "RTM_DELMADDR" };
-
- int index = pRSMsg->ifam_type == RTM_IFINFO ? ((struct if_msghdr*) pRSMsg)->ifm_index : pRSMsg->ifam_index;
-
- printf("ifa_msghdr len=%d, type=%s, index=%d\n", pRSMsg->ifam_msglen, kRSMsgTypes[pRSMsg->ifam_type], index);
- }
-#endif
-
-mDNSlocal mDNSu32 ProcessRoutingNotification(int sd)
-// Read through the messages on sd and if any indicate that any interface records should
-// be torn down and rebuilt, return affected indices as a bitmask. Otherwise return 0.
- {
- ssize_t readCount;
- char buff[4096];
- struct ifa_msghdr *pRSMsg = (struct ifa_msghdr*) buff;
- mDNSu32 result = 0;
-
- readCount = read(sd, buff, sizeof buff);
- if (readCount < (ssize_t) sizeof(struct ifa_msghdr))
- return mStatus_UnsupportedErr; // cannot decipher message
-
-#if MDNS_DEBUGMSGS
- PrintRoutingSocketMsg(pRSMsg);
-#endif
-
- // Process the message
- if (pRSMsg->ifam_type == RTM_NEWADDR || pRSMsg->ifam_type == RTM_DELADDR ||
- pRSMsg->ifam_type == RTM_IFINFO)
- {
- if (pRSMsg->ifam_type == RTM_IFINFO)
- result |= 1 << ((struct if_msghdr*) pRSMsg)->ifm_index;
- else
- result |= 1 << pRSMsg->ifam_index;
- }
-
- return result;
- }
-
-#endif // USES_NETLINK
-
-// Called when data appears on interface change notification socket
-mDNSlocal void InterfaceChangeCallback(int fd, short filter, void *context)
- {
- IfChangeRec *pChgRec = (IfChangeRec*) context;
- fd_set readFDs;
- mDNSu32 changedInterfaces = 0;
- struct timeval zeroTimeout = { 0, 0 };
-
- (void)fd; // Unused
- (void)filter; // Unused
-
- FD_ZERO(&readFDs);
- FD_SET(pChgRec->NotifySD, &readFDs);
-
- do
- {
- changedInterfaces |= ProcessRoutingNotification(pChgRec->NotifySD);
- }
- while (0 < select(pChgRec->NotifySD + 1, &readFDs, (fd_set*) NULL, (fd_set*) NULL, &zeroTimeout));
-
- // Currently we rebuild the entire interface list whenever any interface change is
- // detected. If this ever proves to be a performance issue in a multi-homed
- // configuration, more care should be paid to changedInterfaces.
- if (changedInterfaces)
- mDNSPlatformPosixRefreshInterfaceList(pChgRec->mDNS);
- }
-
-// Register with either a Routing Socket or RtNetLink to listen for interface changes.
-mDNSlocal mStatus WatchForInterfaceChange(mDNS *const m)
- {
- mStatus err;
- IfChangeRec *pChgRec;
-
- pChgRec = (IfChangeRec*) mDNSPlatformMemAllocate(sizeof *pChgRec);
- if (pChgRec == NULL)
- return mStatus_NoMemoryErr;
-
- pChgRec->mDNS = m;
- err = OpenIfNotifySocket(&pChgRec->NotifySD);
- if (err == 0)
- err = mDNSPosixAddFDToEventLoop(pChgRec->NotifySD, InterfaceChangeCallback, pChgRec);
-
- return err;
- }
-
-// Test to see if we're the first client running on UDP port 5353, by trying to bind to 5353 without using SO_REUSEPORT.
-// If we fail, someone else got here first. That's not a big problem; we can share the port for multicast responses --
-// we just need to be aware that we shouldn't expect to successfully receive unicast UDP responses.
-mDNSlocal mDNSBool mDNSPlatformInit_CanReceiveUnicast(void)
- {
- int err;
- int s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
- struct sockaddr_in s5353;
- s5353.sin_family = AF_INET;
- s5353.sin_port = MulticastDNSPort.NotAnInteger;
- s5353.sin_addr.s_addr = 0;
- err = bind(s, (struct sockaddr *)&s5353, sizeof(s5353));
- close(s);
- if (err) debugf("No unicast UDP responses");
- else debugf("Unicast UDP responses okay");
- return(err == 0);
- }
-
-// mDNS core calls this routine to initialise the platform-specific data.
-mDNSexport mStatus mDNSPlatformInit(mDNS *const m)
- {
- int err = 0;
- struct sockaddr sa;
- assert(m != NULL);
-
- if (mDNSPlatformInit_CanReceiveUnicast()) m->CanReceiveUnicastOn5353 = mDNStrue;
-
- // Tell mDNS core the names of this machine.
-
- // Set up the nice label
- m->nicelabel.c[0] = 0;
- GetUserSpecifiedFriendlyComputerName(&m->nicelabel);
- if (m->nicelabel.c[0] == 0) MakeDomainLabelFromLiteralString(&m->nicelabel, "Computer");
-
- // Set up the RFC 1034-compliant label
- m->hostlabel.c[0] = 0;
- GetUserSpecifiedRFC1034ComputerName(&m->hostlabel);
- if (m->hostlabel.c[0] == 0) MakeDomainLabelFromLiteralString(&m->hostlabel, "Computer");
-
- mDNS_SetFQDN(m);
-
- sa.sa_family = AF_INET;
- m->p->unicastSocket4 = -1;
- if (err == mStatus_NoError) err = SetupSocket(&sa, zeroIPPort, 0, &m->p->unicastSocket4);
-#if HAVE_IPV6
- sa.sa_family = AF_INET6;
- m->p->unicastSocket6 = -1;
- if (err == mStatus_NoError) err = SetupSocket(&sa, zeroIPPort, 0, &m->p->unicastSocket6);
-#endif
-
- // Tell mDNS core about the network interfaces on this machine.
- if (err == mStatus_NoError) err = SetupInterfaceList(m);
-
- // Tell mDNS core about DNS Servers
- mDNS_Lock(m);
- if (err == mStatus_NoError) ParseDNSServers(m, uDNS_SERVERS_FILE);
- mDNS_Unlock(m);
-
- if (err == mStatus_NoError)
- {
- err = WatchForInterfaceChange(m);
- // Failure to observe interface changes is non-fatal.
- if (err != mStatus_NoError)
- {
- fprintf(stderr, "mDNS(%d) WARNING: Unable to detect interface changes (%d).\n", getpid(), err);
- err = mStatus_NoError;
- }
- }
-
- // We don't do asynchronous initialization on the Posix platform, so by the time
- // we get here the setup will already have succeeded or failed. If it succeeded,
- // we should just call mDNSCoreInitComplete() immediately.
- if (err == mStatus_NoError)
- mDNSCoreInitComplete(m, mStatus_NoError);
-
- return PosixErrorToStatus(err);
- }
-
-// mDNS core calls this routine to clean up the platform-specific data.
-// In our case all we need to do is to tear down every network interface.
-mDNSexport void mDNSPlatformClose(mDNS *const m)
- {
- assert(m != NULL);
- ClearInterfaceList(m);
- if (m->p->unicastSocket4 != -1) assert(close(m->p->unicastSocket4) == 0);
-#if HAVE_IPV6
- if (m->p->unicastSocket6 != -1) assert(close(m->p->unicastSocket6) == 0);
-#endif
- }
-
-mDNSexport mStatus mDNSPlatformPosixRefreshInterfaceList(mDNS *const m)
- {
- int err;
- ClearInterfaceList(m);
- err = SetupInterfaceList(m);
- return PosixErrorToStatus(err);
- }
-
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark ***** Locking
-#endif
-
-// On the Posix platform, locking is a no-op because we only ever enter
-// mDNS core on the main thread.
-
-// mDNS core calls this routine when it wants to prevent
-// the platform from reentering mDNS core code.
-mDNSexport void mDNSPlatformLock (const mDNS *const m)
- {
- (void) m; // Unused
- }
-
-// mDNS core calls this routine when it release the lock taken by
-// mDNSPlatformLock and allow the platform to reenter mDNS core code.
-mDNSexport void mDNSPlatformUnlock (const mDNS *const m)
- {
- (void) m; // Unused
- }
-
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark ***** Strings
-#endif
-
-// mDNS core calls this routine to copy C strings.
-// On the Posix platform this maps directly to the ANSI C strcpy.
-mDNSexport void mDNSPlatformStrCopy(void *dst, const void *src)
- {
- strcpy((char *)dst, (char *)src);
- }
-
-// mDNS core calls this routine to get the length of a C string.
-// On the Posix platform this maps directly to the ANSI C strlen.
-mDNSexport mDNSu32 mDNSPlatformStrLen (const void *src)
- {
- return strlen((char*)src);
- }
-
-// mDNS core calls this routine to copy memory.
-// On the Posix platform this maps directly to the ANSI C memcpy.
-mDNSexport void mDNSPlatformMemCopy(void *dst, const void *src, mDNSu32 len)
- {
- memcpy(dst, src, len);
- }
-
-// mDNS core calls this routine to test whether blocks of memory are byte-for-byte
-// identical. On the Posix platform this is a simple wrapper around ANSI C memcmp.
-mDNSexport mDNSBool mDNSPlatformMemSame(const void *dst, const void *src, mDNSu32 len)
- {
- return memcmp(dst, src, len) == 0;
- }
-
-// mDNS core calls this routine to clear blocks of memory.
-// On the Posix platform this is a simple wrapper around ANSI C memset.
-mDNSexport void mDNSPlatformMemZero(void *dst, mDNSu32 len)
- {
- memset(dst, 0, len);
- }
-
-mDNSexport void * mDNSPlatformMemAllocate(mDNSu32 len) { return(malloc(len)); }
-mDNSexport void mDNSPlatformMemFree (void *mem) { free(mem); }
-
-mDNSexport mDNSu32 mDNSPlatformRandomSeed(void)
- {
- struct timeval tv;
- gettimeofday(&tv, NULL);
- return(tv.tv_usec);
- }
-
-mDNSexport mDNSs32 mDNSPlatformOneSecond = 1024;
-
-mDNSexport mStatus mDNSPlatformTimeInit(void)
- {
- // No special setup is required on Posix -- we just use gettimeofday();
- // This is not really safe, because gettimeofday can go backwards if the user manually changes the date or time
- // We should find a better way to do this
- return(mStatus_NoError);
- }
-
-mDNSexport mDNSs32 mDNSPlatformRawTime()
- {
- struct timeval tv;
- gettimeofday(&tv, NULL);
- // tv.tv_sec is seconds since 1st January 1970 (GMT, with no adjustment for daylight savings time)
- // tv.tv_usec is microseconds since the start of this second (i.e. values 0 to 999999)
- // We use the lower 22 bits of tv.tv_sec for the top 22 bits of our result
- // and we multiply tv.tv_usec by 16 / 15625 to get a value in the range 0-1023 to go in the bottom 10 bits.
- // This gives us a proper modular (cyclic) counter that has a resolution of roughly 1ms (actually 1/1024 second)
- // and correctly cycles every 2^22 seconds (4194304 seconds = approx 48 days).
- return((tv.tv_sec << 10) | (tv.tv_usec * 16 / 15625));
- }
-
-mDNSexport mDNSs32 mDNSPlatformUTC(void)
- {
- return time(NULL);
- }
-
-mDNSexport void mDNSPlatformSendWakeupPacket(mDNS *const m, mDNSInterfaceID InterfaceID, char *EthAddr, char *IPAddr, int iteration)
- {
- (void) m;
- (void) InterfaceID;
- (void) EthAddr;
- (void) IPAddr;
- (void) iteration;
- }
-
-mDNSexport mDNSBool mDNSPlatformValidRecordForInterface(AuthRecord *rr, const NetworkInterfaceInfo *intf)
- {
- (void) rr;
- (void) intf;
-
- return 1;
- }
-
-mDNSlocal void mDNSPosixAddToFDSet(int *nfds, fd_set *readfds, int s)
- {
- if (*nfds < s + 1) *nfds = s + 1;
- FD_SET(s, readfds);
- }
-
-mDNSexport void mDNSPosixGetFDSet(mDNS *m, int *nfds, fd_set *readfds, struct timeval *timeout)
- {
- mDNSs32 ticks;
- struct timeval interval;
-
- // 1. Call mDNS_Execute() to let mDNSCore do what it needs to do
- mDNSs32 nextevent = mDNS_Execute(m);
-
- // 2. Build our list of active file descriptors
- PosixNetworkInterface *info = (PosixNetworkInterface *)(m->HostInterfaces);
- if (m->p->unicastSocket4 != -1) mDNSPosixAddToFDSet(nfds, readfds, m->p->unicastSocket4);
-#if HAVE_IPV6
- if (m->p->unicastSocket6 != -1) mDNSPosixAddToFDSet(nfds, readfds, m->p->unicastSocket6);
-#endif
- while (info)
- {
- if (info->multicastSocket4 != -1) mDNSPosixAddToFDSet(nfds, readfds, info->multicastSocket4);
-#if HAVE_IPV6
- if (info->multicastSocket6 != -1) mDNSPosixAddToFDSet(nfds, readfds, info->multicastSocket6);
-#endif
- info = (PosixNetworkInterface *)(info->coreIntf.next);
- }
-
- // 3. Calculate the time remaining to the next scheduled event (in struct timeval format)
- ticks = nextevent - mDNS_TimeNow(m);
- if (ticks < 1) ticks = 1;
- interval.tv_sec = ticks >> 10; // The high 22 bits are seconds
- interval.tv_usec = ((ticks & 0x3FF) * 15625) / 16; // The low 10 bits are 1024ths
-
- // 4. If client's proposed timeout is more than what we want, then reduce it
- if (timeout->tv_sec > interval.tv_sec ||
- (timeout->tv_sec == interval.tv_sec && timeout->tv_usec > interval.tv_usec))
- *timeout = interval;
- }
-
-mDNSexport void mDNSPosixProcessFDSet(mDNS *const m, fd_set *readfds)
- {
- PosixNetworkInterface *info;
- assert(m != NULL);
- assert(readfds != NULL);
- info = (PosixNetworkInterface *)(m->HostInterfaces);
-
- if (m->p->unicastSocket4 != -1 && FD_ISSET(m->p->unicastSocket4, readfds))
- {
- FD_CLR(m->p->unicastSocket4, readfds);
- SocketDataReady(m, NULL, m->p->unicastSocket4);
- }
-#if HAVE_IPV6
- if (m->p->unicastSocket6 != -1 && FD_ISSET(m->p->unicastSocket6, readfds))
- {
- FD_CLR(m->p->unicastSocket6, readfds);
- SocketDataReady(m, NULL, m->p->unicastSocket6);
- }
-#endif
-
- while (info)
- {
- if (info->multicastSocket4 != -1 && FD_ISSET(info->multicastSocket4, readfds))
- {
- FD_CLR(info->multicastSocket4, readfds);
- SocketDataReady(m, info, info->multicastSocket4);
- }
-#if HAVE_IPV6
- if (info->multicastSocket6 != -1 && FD_ISSET(info->multicastSocket6, readfds))
- {
- FD_CLR(info->multicastSocket6, readfds);
- SocketDataReady(m, info, info->multicastSocket6);
- }
-#endif
- info = (PosixNetworkInterface *)(info->coreIntf.next);
- }
- }
-
-// update gMaxFD
-mDNSlocal void DetermineMaxEventFD(void)
- {
- PosixEventSource *iSource;
-
- gMaxFD = 0;
- for (iSource=(PosixEventSource*)gEventSources.Head; iSource; iSource = iSource->Next)
- if (gMaxFD < iSource->fd)
- gMaxFD = iSource->fd;
- }
-
-// Add a file descriptor to the set that mDNSPosixRunEventLoopOnce() listens to.
-mStatus mDNSPosixAddFDToEventLoop(int fd, mDNSPosixEventCallback callback, void *context)
- {
- PosixEventSource *newSource;
-
- if (gEventSources.LinkOffset == 0)
- InitLinkedList(&gEventSources, offsetof(PosixEventSource, Next));
-
- if (fd >= (int) FD_SETSIZE || fd < 0)
- return mStatus_UnsupportedErr;
- if (callback == NULL)
- return mStatus_BadParamErr;
-
- newSource = (PosixEventSource*) malloc(sizeof *newSource);
- if (NULL == newSource)
- return mStatus_NoMemoryErr;
-
- newSource->Callback = callback;
- newSource->Context = context;
- newSource->fd = fd;
-
- AddToTail(&gEventSources, newSource);
- FD_SET(fd, &gEventFDs);
-
- DetermineMaxEventFD();
-
- return mStatus_NoError;
- }
-
-// Remove a file descriptor from the set that mDNSPosixRunEventLoopOnce() listens to.
-mStatus mDNSPosixRemoveFDFromEventLoop(int fd)
- {
- PosixEventSource *iSource;
-
- for (iSource=(PosixEventSource*)gEventSources.Head; iSource; iSource = iSource->Next)
- {
- if (fd == iSource->fd)
- {
- FD_CLR(fd, &gEventFDs);
- RemoveFromList(&gEventSources, iSource);
- free(iSource);
- DetermineMaxEventFD();
- return mStatus_NoError;
- }
- }
- return mStatus_NoSuchNameErr;
- }
-
-// Simply note the received signal in gEventSignals.
-mDNSlocal void NoteSignal(int signum)
- {
- sigaddset(&gEventSignals, signum);
- }
-
-// Tell the event package to listen for signal and report it in mDNSPosixRunEventLoopOnce().
-mStatus mDNSPosixListenForSignalInEventLoop(int signum)
- {
- struct sigaction action;
- mStatus err;
-
- mDNSPlatformMemZero(&action, sizeof action); // more portable than member-wise assignment
- action.sa_handler = NoteSignal;
- err = sigaction(signum, &action, (struct sigaction*) NULL);
-
- sigaddset(&gEventSignalSet, signum);
-
- return err;
- }
-
-// Tell the event package to stop listening for signal in mDNSPosixRunEventLoopOnce().
-mStatus mDNSPosixIgnoreSignalInEventLoop(int signum)
- {
- struct sigaction action;
- mStatus err;
-
- mDNSPlatformMemZero(&action, sizeof action); // more portable than member-wise assignment
- action.sa_handler = SIG_DFL;
- err = sigaction(signum, &action, (struct sigaction*) NULL);
-
- sigdelset(&gEventSignalSet, signum);
-
- return err;
- }
-
-// Do a single pass through the attendent event sources and dispatch any found to their callbacks.
-// Return as soon as internal timeout expires, or a signal we're listening for is received.
-mStatus mDNSPosixRunEventLoopOnce(mDNS *m, const struct timeval *pTimeout,
- sigset_t *pSignalsReceived, mDNSBool *pDataDispatched)
- {
- fd_set listenFDs = gEventFDs;
- int fdMax = 0, numReady;
- struct timeval timeout = *pTimeout;
-
- // Include the sockets that are listening to the wire in our select() set
- mDNSPosixGetFDSet(m, &fdMax, &listenFDs, &timeout); // timeout may get modified
- if (fdMax < gMaxFD)
- fdMax = gMaxFD;
-
- numReady = select(fdMax + 1, &listenFDs, (fd_set*) NULL, (fd_set*) NULL, &timeout);
-
- // If any data appeared, invoke its callback
- if (numReady > 0)
- {
- PosixEventSource *iSource;
-
- (void) mDNSPosixProcessFDSet(m, &listenFDs); // call this first to process wire data for clients
-
- for (iSource=(PosixEventSource*)gEventSources.Head; iSource; iSource = iSource->Next)
- {
- if (FD_ISSET(iSource->fd, &listenFDs))
- {
- iSource->Callback(iSource->fd, 0, iSource->Context);
- break; // in case callback removed elements from gEventSources
- }
- }
- *pDataDispatched = mDNStrue;
- }
- else
- *pDataDispatched = mDNSfalse;
-
- (void) sigprocmask(SIG_BLOCK, &gEventSignalSet, (sigset_t*) NULL);
- *pSignalsReceived = gEventSignals;
- sigemptyset(&gEventSignals);
- (void) sigprocmask(SIG_UNBLOCK, &gEventSignalSet, (sigset_t*) NULL);
-
- return mStatus_NoError;
- }
diff --git a/src/tools/mdnssd/mDNSPosix.h b/src/tools/mdnssd/mDNSPosix.h
deleted file mode 100755
index dab4b11a4c5..00000000000
--- a/src/tools/mdnssd/mDNSPosix.h
+++ /dev/null
@@ -1,85 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2002-2004 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef __mDNSPlatformPosix_h
-#define __mDNSPlatformPosix_h
-
-#include <signal.h>
-#include <sys/time.h>
-
-#ifdef __cplusplus
- extern "C" {
-#endif
-
-// PosixNetworkInterface is a record extension of the core NetworkInterfaceInfo
-// type that supports extra fields needed by the Posix platform.
-//
-// IMPORTANT: coreIntf must be the first field in the structure because
-// we cast between pointers to the two different types regularly.
-
-typedef struct PosixNetworkInterface PosixNetworkInterface;
-
-struct PosixNetworkInterface
- {
- NetworkInterfaceInfo coreIntf;
- const char * intfName;
- PosixNetworkInterface * aliasIntf;
- int index;
- int multicastSocket4;
-#if HAVE_IPV6
- int multicastSocket6;
-#endif
- };
-
-// This is a global because debugf_() needs to be able to check its value
-extern int gMDNSPlatformPosixVerboseLevel;
-
-struct mDNS_PlatformSupport_struct
- {
- int unicastSocket4;
-#if HAVE_IPV6
- int unicastSocket6;
-#endif
- };
-
-#define uDNS_SERVERS_FILE "/etc/resolv.conf"
-extern int ParseDNSServers(mDNS *m, const char *filePath);
-extern mStatus mDNSPlatformPosixRefreshInterfaceList(mDNS *const m);
- // See comment in implementation.
-
-// Call mDNSPosixGetFDSet before calling select(), to update the parameters
-// as may be necessary to meet the needs of the mDNSCore code.
-// The timeout pointer MUST NOT be NULL.
-// Set timeout->tv_sec to 0x3FFFFFFF if you want to have effectively no timeout
-// After calling mDNSPosixGetFDSet(), call select(nfds, &readfds, NULL, NULL, &timeout); as usual
-// After select() returns, call mDNSPosixProcessFDSet() to let mDNSCore do its work
-extern void mDNSPosixGetFDSet(mDNS *m, int *nfds, fd_set *readfds, struct timeval *timeout);
-extern void mDNSPosixProcessFDSet(mDNS *const m, fd_set *readfds);
-
-typedef void (*mDNSPosixEventCallback)(int fd, short filter, void *context);
-
-extern mStatus mDNSPosixAddFDToEventLoop( int fd, mDNSPosixEventCallback callback, void *context);
-extern mStatus mDNSPosixRemoveFDFromEventLoop( int fd);
-extern mStatus mDNSPosixListenForSignalInEventLoop( int signum);
-extern mStatus mDNSPosixIgnoreSignalInEventLoop( int signum);
-extern mStatus mDNSPosixRunEventLoopOnce( mDNS *m, const struct timeval *pTimeout, sigset_t *pSignalsReceived, mDNSBool *pDataDispatched);
-
-#ifdef __cplusplus
- }
-#endif
-
-#endif
diff --git a/src/tools/mdnssd/mDNSUNP.c b/src/tools/mdnssd/mDNSUNP.c
deleted file mode 100755
index 8027676cfe3..00000000000
--- a/src/tools/mdnssd/mDNSUNP.c
+++ /dev/null
@@ -1,719 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2002-2004 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "mDNSUNP.h"
-
-#include <errno.h>
-#include <assert.h>
-#include <string.h>
-#include <stdlib.h>
-#include <sys/uio.h>
-#include <sys/ioctl.h>
-#include <signal.h>
-#include <unistd.h>
-#include <stdio.h>
-
-/* Some weird platforms derived from 4.4BSD Lite (e.g. EFI) need the ALIGN(P)
- macro, usually defined in <sys/param.h> or someplace like that, to make sure the
- CMSG_NXTHDR macro is well-formed. On such platforms, the symbol NEED_ALIGN_MACRO
- should be set to the name of the header to include to get the ALIGN(P) macro.
-*/
-#ifdef NEED_ALIGN_MACRO
-#include NEED_ALIGN_MACRO
-#endif
-
-/* Solaris defined SIOCGIFCONF etc in <sys/sockio.h> but
- other platforms don't even have that include file. So,
- if we haven't yet got a definition, let's try to find
- <sys/sockio.h>.
-*/
-
-#ifndef SIOCGIFCONF
- #include <sys/sockio.h>
-#endif
-
-/* sockaddr_dl is only referenced if we're using IP_RECVIF,
- so only include the header in that case.
-*/
-
-#ifdef IP_RECVIF
- #include <net/if_dl.h>
-#endif
-
-#if defined(AF_INET6) && HAVE_IPV6 && !HAVE_LINUX
-#include <net/if_var.h>
-#include <netinet/in_var.h>
-// Note: netinet/in_var.h implicitly includes netinet6/in6_var.h for us
-#endif
-
-#if defined(AF_INET6) && HAVE_IPV6 && HAVE_LINUX
-#include <netdb.h>
-#include <arpa/inet.h>
-
-/* Converts a prefix length to IPv6 network mask */
-void plen_to_mask(int plen, char *addr) {
- int i;
- int colons=7; /* Number of colons in IPv6 address */
- int bits_in_block=16; /* Bits per IPv6 block */
- for(i=0;i<=colons;i++) {
- int block, ones=0xffff, ones_in_block;
- if (plen>bits_in_block) ones_in_block=bits_in_block;
- else ones_in_block=plen;
- block = ones & (ones << (bits_in_block-ones_in_block));
- i==0 ? sprintf(addr, "%x", block) : sprintf(addr, "%s:%x", addr, block);
- plen -= ones_in_block;
- }
- }
-
-/* Gets IPv6 interface information from the /proc filesystem in linux*/
-struct ifi_info *get_ifi_info_linuxv6(int family, int doaliases)
- {
- struct ifi_info *ifi, *ifihead, **ifipnext, *ifipold, **ifiptr;
- FILE *fp;
- char addr[8][5];
- int flags, myflags, index, plen, scope;
- char ifname[9], lastname[IFNAMSIZ];
- char addr6[32+7+1]; /* don't forget the seven ':' */
- struct addrinfo hints, *res0;
- struct sockaddr_in6 *sin6;
- struct in6_addr *addrptr;
- int err;
- int sockfd = -1;
- struct ifreq ifr;
-
- res0=NULL;
- ifihead = NULL;
- ifipnext = &ifihead;
- lastname[0] = 0;
-
- if ((fp = fopen(PROC_IFINET6_PATH, "r")) != NULL) {
- sockfd = socket(AF_INET6, SOCK_DGRAM, 0);
- if (sockfd < 0) {
- goto gotError;
- }
- while (fscanf(fp,
- "%4s%4s%4s%4s%4s%4s%4s%4s %02x %02x %02x %02x %8s\n",
- addr[0],addr[1],addr[2],addr[3],
- addr[4],addr[5],addr[6],addr[7],
- &index, &plen, &scope, &flags, ifname) != EOF) {
-
- myflags = 0;
- if (strncmp(lastname, ifname, IFNAMSIZ) == 0) {
- if (doaliases == 0)
- continue; /* already processed this interface */
- myflags = IFI_ALIAS;
- }
- memcpy(lastname, ifname, IFNAMSIZ);
- ifi = (struct ifi_info*)calloc(1, sizeof(struct ifi_info));
- if (ifi == NULL) {
- goto gotError;
- }
-
- ifipold = *ifipnext; /* need this later */
- ifiptr = ifipnext;
- *ifipnext = ifi; /* prev points to this new one */
- ifipnext = &ifi->ifi_next; /* pointer to next one goes here */
-
- sprintf(addr6, "%s:%s:%s:%s:%s:%s:%s:%s",
- addr[0],addr[1],addr[2],addr[3],
- addr[4],addr[5],addr[6],addr[7]);
-
- /* Add address of the interface */
- memset(&hints, 0, sizeof(hints));
- hints.ai_family = AF_INET6;
- hints.ai_flags = AI_NUMERICHOST;
- err = getaddrinfo(addr6, NULL, &hints, &res0);
- if (err) {
- goto gotError;
- }
- ifi->ifi_addr = calloc(1, sizeof(struct sockaddr_in6));
- if (ifi->ifi_addr == NULL) {
- goto gotError;
- }
- memcpy(ifi->ifi_addr, res0->ai_addr, sizeof(struct sockaddr_in6));
-
- /* Add netmask of the interface */
- char ipv6addr[INET6_ADDRSTRLEN];
- plen_to_mask(plen, ipv6addr);
- ifi->ifi_netmask = calloc(1, sizeof(struct sockaddr_in6));
- if (ifi->ifi_addr == NULL) {
- goto gotError;
- }
- sin6=calloc(1, sizeof(struct sockaddr_in6));
- addrptr=calloc(1, sizeof(struct in6_addr));
- inet_pton(family, ipv6addr, addrptr);
- sin6->sin6_family=family;
- sin6->sin6_addr=*addrptr;
- sin6->sin6_scope_id=scope;
- memcpy(ifi->ifi_netmask, sin6, sizeof(struct sockaddr_in6));
- free(sin6);
-
-
- /* Add interface name */
- memcpy(ifi->ifi_name, ifname, IFI_NAME);
-
- /* Add interface index */
- ifi->ifi_index = index;
-
- /* Add interface flags*/
- memcpy(ifr.ifr_name, ifname, IFNAMSIZ);
- if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
- if (errno == EADDRNOTAVAIL) {
- /*
- * If the main interface is configured with no IP address but
- * an alias interface exists with an IP address, you get
- * EADDRNOTAVAIL for the main interface
- */
- free(ifi->ifi_addr);
- free(ifi);
- ifipnext = ifiptr;
- *ifipnext = ifipold;
- continue;
- } else {
- goto gotError;
- }
- }
- ifi->ifi_flags = ifr.ifr_flags;
- freeaddrinfo(res0);
- res0=NULL;
- }
- }
- goto done;
-
- gotError:
- if (ifihead != NULL) {
- free_ifi_info(ifihead);
- ifihead = NULL;
- }
- if (res0 != NULL) {
- freeaddrinfo(res0);
- res0=NULL;
- }
- done:
- if (sockfd != -1) {
- assert(close(sockfd) == 0);
- }
- return(ifihead); /* pointer to first structure in linked list */
- }
-#endif // defined(AF_INET6) && HAVE_IPV6 && HAVE_LINUX
-
-struct ifi_info *get_ifi_info(int family, int doaliases)
-{
- int junk;
- struct ifi_info *ifi, *ifihead, **ifipnext, *ifipold, **ifiptr;
- int sockfd, sockf6, len, lastlen, flags, myflags;
-#ifdef NOT_HAVE_IF_NAMETOINDEX
- int index = 200;
-#endif
- char *ptr, *buf, lastname[IFNAMSIZ], *cptr;
- struct ifconf ifc;
- struct ifreq *ifr, ifrcopy;
- struct sockaddr_in *sinptr;
-
-#if defined(AF_INET6) && HAVE_IPV6
- struct sockaddr_in6 *sinptr6;
-#endif
-
-#if defined(AF_INET6) && HAVE_IPV6 && HAVE_LINUX
- if (family == AF_INET6) return get_ifi_info_linuxv6(family, doaliases);
-#endif
-
- sockfd = -1;
- sockf6 = -1;
- buf = NULL;
- ifihead = NULL;
-
- sockfd = socket(AF_INET, SOCK_DGRAM, 0);
- if (sockfd < 0) {
- goto gotError;
- }
-
- lastlen = 0;
- len = 100 * sizeof(struct ifreq); /* initial buffer size guess */
- for ( ; ; ) {
- buf = (char*)malloc(len);
- if (buf == NULL) {
- goto gotError;
- }
- ifc.ifc_len = len;
- ifc.ifc_buf = buf;
- if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
- if (errno != EINVAL || lastlen != 0) {
- goto gotError;
- }
- } else {
- if (ifc.ifc_len == lastlen)
- break; /* success, len has not changed */
- lastlen = ifc.ifc_len;
- }
- len += 10 * sizeof(struct ifreq); /* increment */
- free(buf);
- }
- ifihead = NULL;
- ifipnext = &ifihead;
- lastname[0] = 0;
-/* end get_ifi_info1 */
-
-/* include get_ifi_info2 */
- for (ptr = buf; ptr < buf + ifc.ifc_len; ) {
- ifr = (struct ifreq *) ptr;
-
- /* Advance to next one in buffer */
- if (sizeof(struct ifreq) > sizeof(ifr->ifr_name) + GET_SA_LEN(ifr->ifr_addr))
- ptr += sizeof(struct ifreq);
- else
- ptr += sizeof(ifr->ifr_name) + GET_SA_LEN(ifr->ifr_addr);
-
-// fprintf(stderr, "intf %p name=%s AF=%d\n", index, ifr->ifr_name, ifr->ifr_addr.sa_family);
-
- if (ifr->ifr_addr.sa_family != family)
- continue; /* ignore if not desired address family */
-
- myflags = 0;
- if ( (cptr = strchr(ifr->ifr_name, ':')) != NULL)
- *cptr = 0; /* replace colon will null */
- if (strncmp(lastname, ifr->ifr_name, IFNAMSIZ) == 0) {
- if (doaliases == 0)
- continue; /* already processed this interface */
- myflags = IFI_ALIAS;
- }
- memcpy(lastname, ifr->ifr_name, IFNAMSIZ);
-
- ifrcopy = *ifr;
- if (ioctl(sockfd, SIOCGIFFLAGS, &ifrcopy) < 0) {
- goto gotError;
- }
-
- flags = ifrcopy.ifr_flags;
- if ((flags & IFF_UP) == 0)
- continue; /* ignore if interface not up */
-
- ifi = (struct ifi_info*)calloc(1, sizeof(struct ifi_info));
- if (ifi == NULL) {
- goto gotError;
- }
- ifipold = *ifipnext; /* need this later */
- ifiptr = ifipnext;
- *ifipnext = ifi; /* prev points to this new one */
- ifipnext = &ifi->ifi_next; /* pointer to next one goes here */
-
- ifi->ifi_flags = flags; /* IFF_xxx values */
- ifi->ifi_myflags = myflags; /* IFI_xxx values */
-#ifndef NOT_HAVE_IF_NAMETOINDEX
- ifi->ifi_index = if_nametoindex(ifr->ifr_name);
-#else
- ifrcopy = *ifr;
-#ifdef SIOCGIFINDEX
- if ( 0 >= ioctl(sockfd, SIOCGIFINDEX, &ifrcopy))
- ifi->ifi_index = ifrcopy.ifr_index;
- else
-#endif
- ifi->ifi_index = index++; /* SIOCGIFINDEX is broken on Solaris 2.5ish, so fake it */
-#endif
- memcpy(ifi->ifi_name, ifr->ifr_name, IFI_NAME);
- ifi->ifi_name[IFI_NAME-1] = '\0';
-/* end get_ifi_info2 */
-/* include get_ifi_info3 */
- switch (ifr->ifr_addr.sa_family) {
- case AF_INET:
- sinptr = (struct sockaddr_in *) &ifr->ifr_addr;
- if (ifi->ifi_addr == NULL) {
- ifi->ifi_addr = (struct sockaddr*)calloc(1, sizeof(struct sockaddr_in));
- if (ifi->ifi_addr == NULL) {
- goto gotError;
- }
- memcpy(ifi->ifi_addr, sinptr, sizeof(struct sockaddr_in));
-
-#ifdef SIOCGIFNETMASK
- if (ioctl(sockfd, SIOCGIFNETMASK, &ifrcopy) < 0) {
- if (errno == EADDRNOTAVAIL) {
- /*
- * If the main interface is configured with no IP address but
- * an alias interface exists with an IP address, you get
- * EADDRNOTAVAIL for the main interface
- */
- free(ifi->ifi_addr);
- free(ifi);
- ifipnext = ifiptr;
- *ifipnext = ifipold;
- continue;
- } else {
- goto gotError;
- }
- }
-
- ifi->ifi_netmask = (struct sockaddr*)calloc(1, sizeof(struct sockaddr_in));
- if (ifi->ifi_netmask == NULL) goto gotError;
- sinptr = (struct sockaddr_in *) &ifrcopy.ifr_addr;
- /* The BSD ioctls (including Mac OS X) stick some weird values in for sin_len and sin_family */
-#ifndef NOT_HAVE_SA_LEN
- sinptr->sin_len = sizeof(struct sockaddr_in);
-#endif
- sinptr->sin_family = AF_INET;
- memcpy(ifi->ifi_netmask, sinptr, sizeof(struct sockaddr_in));
-#endif
-
-#ifdef SIOCGIFBRDADDR
- if (flags & IFF_BROADCAST) {
- if (ioctl(sockfd, SIOCGIFBRDADDR, &ifrcopy) < 0) {
- goto gotError;
- }
- sinptr = (struct sockaddr_in *) &ifrcopy.ifr_broadaddr;
- /* The BSD ioctls (including Mac OS X) stick some weird values in for sin_len and sin_family */
-#ifndef NOT_HAVE_SA_LEN
- sinptr->sin_len = sizeof( struct sockaddr_in );
-#endif
- sinptr->sin_family = AF_INET;
- ifi->ifi_brdaddr = (struct sockaddr*)calloc(1, sizeof(struct sockaddr_in));
- if (ifi->ifi_brdaddr == NULL) {
- goto gotError;
- }
- memcpy(ifi->ifi_brdaddr, sinptr, sizeof(struct sockaddr_in));
- }
-#endif
-
-#ifdef SIOCGIFDSTADDR
- if (flags & IFF_POINTOPOINT) {
- if (ioctl(sockfd, SIOCGIFDSTADDR, &ifrcopy) < 0) {
- goto gotError;
- }
- sinptr = (struct sockaddr_in *) &ifrcopy.ifr_dstaddr;
- /* The BSD ioctls (including Mac OS X) stick some weird values in for sin_len and sin_family */
-#ifndef NOT_HAVE_SA_LEN
- sinptr->sin_len = sizeof( struct sockaddr_in );
-#endif
- sinptr->sin_family = AF_INET;
- ifi->ifi_dstaddr = (struct sockaddr*)calloc(1, sizeof(struct sockaddr_in));
- if (ifi->ifi_dstaddr == NULL) {
- goto gotError;
- }
- memcpy(ifi->ifi_dstaddr, sinptr, sizeof(struct sockaddr_in));
- }
-#endif
- }
- break;
-
-#if defined(AF_INET6) && HAVE_IPV6
- case AF_INET6:
- sinptr6 = (struct sockaddr_in6 *) &ifr->ifr_addr;
- if (ifi->ifi_addr == NULL) {
- ifi->ifi_addr = calloc(1, sizeof(struct sockaddr_in6));
- if (ifi->ifi_addr == NULL) {
- goto gotError;
- }
-
- /* Some platforms (*BSD) inject the prefix in IPv6LL addresses */
- /* We need to strip that out */
- if (IN6_IS_ADDR_LINKLOCAL(&sinptr6->sin6_addr))
- sinptr6->sin6_addr.s6_addr[2] = sinptr6->sin6_addr.s6_addr[3] = 0;
- memcpy(ifi->ifi_addr, sinptr6, sizeof(struct sockaddr_in6));
-
-#ifdef SIOCGIFNETMASK_IN6
- {
- struct in6_ifreq ifr6;
- if (sockf6 == -1)
- sockf6 = socket(AF_INET6, SOCK_DGRAM, 0);
- memset(&ifr6, 0, sizeof(ifr6));
- memcpy(&ifr6.ifr_name, &ifr->ifr_name, sizeof(ifr6.ifr_name ));
- memcpy(&ifr6.ifr_ifru.ifru_addr, &ifr->ifr_addr, sizeof(ifr6.ifr_ifru.ifru_addr));
- if (ioctl(sockf6, SIOCGIFNETMASK_IN6, &ifr6) < 0) {
- if (errno == EADDRNOTAVAIL) {
- /*
- * If the main interface is configured with no IP address but
- * an alias interface exists with an IP address, you get
- * EADDRNOTAVAIL for the main interface
- */
- free(ifi->ifi_addr);
- free(ifi);
- ifipnext = ifiptr;
- *ifipnext = ifipold;
- continue;
- } else {
- goto gotError;
- }
- }
- ifi->ifi_netmask = (struct sockaddr*)calloc(1, sizeof(struct sockaddr_in6));
- if (ifi->ifi_netmask == NULL) goto gotError;
- sinptr6 = (struct sockaddr_in6 *) &ifr6.ifr_ifru.ifru_addr;
- memcpy(ifi->ifi_netmask, sinptr6, sizeof(struct sockaddr_in6));
- }
-#endif
- }
- break;
-#endif
-
- default:
- break;
- }
- }
- goto done;
-
-gotError:
- if (ifihead != NULL) {
- free_ifi_info(ifihead);
- ifihead = NULL;
- }
-
-done:
- if (buf != NULL) {
- free(buf);
- }
- if (sockfd != -1) {
- junk = close(sockfd);
- assert(junk == 0);
- }
- if (sockf6 != -1) {
- junk = close(sockf6);
- assert(junk == 0);
- }
- return(ifihead); /* pointer to first structure in linked list */
-}
-/* end get_ifi_info3 */
-
-/* include free_ifi_info */
-void
-free_ifi_info(struct ifi_info *ifihead)
-{
- struct ifi_info *ifi, *ifinext;
-
- for (ifi = ifihead; ifi != NULL; ifi = ifinext) {
- if (ifi->ifi_addr != NULL)
- free(ifi->ifi_addr);
- if (ifi->ifi_netmask != NULL)
- free(ifi->ifi_netmask);
- if (ifi->ifi_brdaddr != NULL)
- free(ifi->ifi_brdaddr);
- if (ifi->ifi_dstaddr != NULL)
- free(ifi->ifi_dstaddr);
- ifinext = ifi->ifi_next; /* can't fetch ifi_next after free() */
- free(ifi); /* the ifi_info{} itself */
- }
-}
-/* end free_ifi_info */
-
-ssize_t
-recvfrom_flags(int fd, void *ptr, size_t nbytes, int *flagsp,
- struct sockaddr *sa, socklen_t *salenptr, struct my_in_pktinfo *pktp, u_char *ttl)
-{
- struct msghdr msg;
- struct iovec iov[1];
- ssize_t n;
-
-#ifdef CMSG_FIRSTHDR
- struct cmsghdr *cmptr;
- union {
- struct cmsghdr cm;
- char control[1024];
- } control_un;
-
- *ttl = 255; // If kernel fails to provide TTL data then assume the TTL was 255 as it should be
-
- msg.msg_control = control_un.control;
- msg.msg_controllen = sizeof(control_un.control);
- msg.msg_flags = 0;
-#else
- memset(&msg, 0, sizeof(msg)); /* make certain msg_accrightslen = 0 */
-#endif /* CMSG_FIRSTHDR */
-
- msg.msg_name = (char *) sa;
- msg.msg_namelen = *salenptr;
- iov[0].iov_base = (char *)ptr;
- iov[0].iov_len = nbytes;
- msg.msg_iov = iov;
- msg.msg_iovlen = 1;
-
- if ( (n = recvmsg(fd, &msg, *flagsp)) < 0)
- return(n);
-
- *salenptr = msg.msg_namelen; /* pass back results */
- if (pktp) {
- /* 0.0.0.0, i/f = -1 */
- /* We set the interface to -1 so that the caller can
- tell whether we returned a meaningful value or
- just some default. Previously this code just
- set the value to 0, but I'm concerned that 0
- might be a valid interface value.
- */
- memset(pktp, 0, sizeof(struct my_in_pktinfo));
- pktp->ipi_ifindex = -1;
- }
-/* end recvfrom_flags1 */
-
-/* include recvfrom_flags2 */
-#ifndef CMSG_FIRSTHDR
- #warning CMSG_FIRSTHDR not defined. Will not be able to determine destination address, received interface, etc.
- *flagsp = 0; /* pass back results */
- return(n);
-#else
-
- *flagsp = msg.msg_flags; /* pass back results */
- if (msg.msg_controllen < (socklen_t)sizeof(struct cmsghdr) ||
- (msg.msg_flags & MSG_CTRUNC) || pktp == NULL)
- return(n);
-
- for (cmptr = CMSG_FIRSTHDR(&msg); cmptr != NULL;
- cmptr = CMSG_NXTHDR(&msg, cmptr)) {
-
-#ifdef IP_PKTINFO
-#if in_pktinfo_definition_is_missing
-struct in_pktinfo
-{
- int ipi_ifindex;
- struct in_addr ipi_spec_dst;
- struct in_addr ipi_addr;
-};
-#endif
- if (cmptr->cmsg_level == IPPROTO_IP &&
- cmptr->cmsg_type == IP_PKTINFO) {
- struct in_pktinfo *tmp;
- struct sockaddr_in *sin = (struct sockaddr_in*)&pktp->ipi_addr;
-
- tmp = (struct in_pktinfo *) CMSG_DATA(cmptr);
- sin->sin_family = AF_INET;
- sin->sin_addr = tmp->ipi_addr;
- sin->sin_port = 0;
- pktp->ipi_ifindex = tmp->ipi_ifindex;
- continue;
- }
-#endif
-
-#ifdef IP_RECVDSTADDR
- if (cmptr->cmsg_level == IPPROTO_IP &&
- cmptr->cmsg_type == IP_RECVDSTADDR) {
- struct sockaddr_in *sin = (struct sockaddr_in*)&pktp->ipi_addr;
-
- sin->sin_family = AF_INET;
- sin->sin_addr = *(struct in_addr*)CMSG_DATA(cmptr);
- sin->sin_port = 0;
- continue;
- }
-#endif
-
-#ifdef IP_RECVIF
- if (cmptr->cmsg_level == IPPROTO_IP &&
- cmptr->cmsg_type == IP_RECVIF) {
- struct sockaddr_dl *sdl = (struct sockaddr_dl *) CMSG_DATA(cmptr);
-#ifndef HAVE_BROKEN_RECVIF_NAME
- int nameLen = (sdl->sdl_nlen < IFI_NAME - 1) ? sdl->sdl_nlen : (IFI_NAME - 1);
- strncpy(pktp->ipi_ifname, sdl->sdl_data, nameLen);
-#endif
- pktp->ipi_ifindex = sdl->sdl_index;
-#ifdef HAVE_BROKEN_RECVIF_NAME
- if (sdl->sdl_index == 0) {
- pktp->ipi_ifindex = *(uint_t*)sdl;
- }
-#endif
- assert(pktp->ipi_ifname[IFI_NAME - 1] == 0);
- // null terminated because of memset above
- continue;
- }
-#endif
-
-#ifdef IP_RECVTTL
- if (cmptr->cmsg_level == IPPROTO_IP &&
- cmptr->cmsg_type == IP_RECVTTL) {
- *ttl = *(u_char*)CMSG_DATA(cmptr);
- continue;
- }
- else if (cmptr->cmsg_level == IPPROTO_IP &&
- cmptr->cmsg_type == IP_TTL) { // some implementations seem to send IP_TTL instead of IP_RECVTTL
- *ttl = *(int*)CMSG_DATA(cmptr);
- continue;
- }
-#endif
-
-#if defined(IPV6_PKTINFO) && HAVE_IPV6
- if (cmptr->cmsg_level == IPPROTO_IPV6 &&
- cmptr->cmsg_type == IPV6_2292_PKTINFO) {
- struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)&pktp->ipi_addr;
- struct in6_pktinfo *ip6_info = (struct in6_pktinfo*)CMSG_DATA(cmptr);
-
- sin6->sin6_family = AF_INET6;
-#ifndef NOT_HAVE_SA_LEN
- sin6->sin6_len = sizeof(*sin6);
-#endif
- sin6->sin6_addr = ip6_info->ipi6_addr;
- sin6->sin6_flowinfo = 0;
- sin6->sin6_scope_id = 0;
- sin6->sin6_port = 0;
- pktp->ipi_ifindex = ip6_info->ipi6_ifindex;
- continue;
- }
-#endif
-
-#if defined(IPV6_HOPLIMIT) && HAVE_IPV6
- if (cmptr->cmsg_level == IPPROTO_IPV6 &&
- cmptr->cmsg_type == IPV6_2292_HOPLIMIT) {
- *ttl = *(int*)CMSG_DATA(cmptr);
- continue;
- }
-#endif
- assert(0); // unknown ancillary data
- }
- return(n);
-#endif /* CMSG_FIRSTHDR */
-}
-
-// **********************************************************************************************
-
-// daemonize the process. Adapted from "Unix Network Programming" vol 1 by Stevens, section 12.4.
-// Returns 0 on success, -1 on failure.
-
-#ifdef NOT_HAVE_DAEMON
-#include <fcntl.h>
-#include <sys/stat.h>
-#include <sys/signal.h>
-
-int daemon(int nochdir, int noclose)
- {
- switch (fork())
- {
- case -1: return (-1); // Fork failed
- case 0: break; // Child -- continue
- default: _exit(0); // Parent -- exit
- }
-
- if (setsid() == -1) return(-1);
-
- signal(SIGHUP, SIG_IGN);
-
- switch (fork()) // Fork again, primarily for reasons of Unix trivia
- {
- case -1: return (-1); // Fork failed
- case 0: break; // Child -- continue
- default: _exit(0); // Parent -- exit
- }
-
- if (!nochdir) (void)chdir("/");
- umask(0);
-
- if (!noclose)
- {
- int fd = open("/dev/null", O_RDWR, 0);
- if (fd != -1)
- {
- // Avoid unnecessarily duplicating a file descriptor to itself
- if (fd != STDIN_FILENO) (void)dup2(fd, STDIN_FILENO);
- if (fd != STDOUT_FILENO) (void)dup2(fd, STDOUT_FILENO);
- if (fd != STDERR_FILENO) (void)dup2(fd, STDERR_FILENO);
- if (fd != STDIN_FILENO && fd != STDOUT_FILENO && fd != STDERR_FILENO)
- (void)close (fd);
- }
- }
- return (0);
- }
-#endif /* NOT_HAVE_DAEMON */
diff --git a/src/tools/mdnssd/mDNSUNP.h b/src/tools/mdnssd/mDNSUNP.h
deleted file mode 100755
index 6b04601f509..00000000000
--- a/src/tools/mdnssd/mDNSUNP.h
+++ /dev/null
@@ -1,130 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2002-2004 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef __mDNSUNP_h
-#define __mDNSUNP_h
-
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <net/if.h>
-#include <netinet/in.h>
-
-#ifdef HAVE_LINUX
-#include <linux/socket.h>
-#define IPV6_2292_PKTINFO IPV6_2292PKTINFO
-#define IPV6_2292_HOPLIMIT IPV6_2292HOPLIMIT
-#else
-// The following are the supported non-linux posix OSes -
-// netbsd, freebsd and openbsd.
-#if HAVE_IPV6
-#define IPV6_2292_PKTINFO 19
-#define IPV6_2292_HOPLIMIT 20
-#endif
-#endif
-
-#ifdef __cplusplus
- extern "C" {
-#endif
-
-#ifdef NOT_HAVE_SOCKLEN_T
- typedef unsigned int socklen_t;
-#endif
-
-#if !defined(_SS_MAXSIZE)
-#if HAVE_IPV6
-#define sockaddr_storage sockaddr_in6
-#else
-#define sockaddr_storage sockaddr
-#endif // HAVE_IPV6
-#endif // !defined(_SS_MAXSIZE)
-
-#ifndef NOT_HAVE_SA_LEN
-#define GET_SA_LEN(X) (sizeof(struct sockaddr) > ((struct sockaddr*)&(X))->sa_len ? \
- sizeof(struct sockaddr) : ((struct sockaddr*)&(X))->sa_len )
-#elif HAVE_IPV6
-#define GET_SA_LEN(X) (((struct sockaddr*)&(X))->sa_family == AF_INET ? sizeof(struct sockaddr_in) : \
- ((struct sockaddr*)&(X))->sa_family == AF_INET6 ? sizeof(struct sockaddr_in6) : sizeof(struct sockaddr))
-#else
-#define GET_SA_LEN(X) (((struct sockaddr*)&(X))->sa_family == AF_INET ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr))
-#endif
-
-#define IFI_NAME 16 /* same as IFNAMSIZ in <net/if.h> */
-#define IFI_HADDR 8 /* allow for 64-bit EUI-64 in future */
-
-// Renamed from my_in_pktinfo because in_pktinfo is used by Linux.
-
-struct my_in_pktinfo {
- struct sockaddr_storage ipi_addr;
- int ipi_ifindex; /* received interface index */
- char ipi_ifname[IFI_NAME]; /* received interface name */
-};
-
-/* From the text (Stevens, section 20.2): */
-/* 'As an example of recvmsg we will write a function named recvfrom_flags that */
-/* is similar to recvfrom but also returns: */
-/* 1. the returned msg_flags value, */
-/* 2. the destination addres of the received datagram (from the IP_RECVDSTADDR socket option, and */
-/* 3. the index of the interface on which the datagram was received (the IP_RECVIF socket option).' */
-extern ssize_t recvfrom_flags(int fd, void *ptr, size_t nbytes, int *flagsp,
- struct sockaddr *sa, socklen_t *salenptr, struct my_in_pktinfo *pktp, u_char *ttl);
-
-struct ifi_info {
- char ifi_name[IFI_NAME]; /* interface name, null terminated */
- u_char ifi_haddr[IFI_HADDR]; /* hardware address */
- u_short ifi_hlen; /* #bytes in hardware address: 0, 6, 8 */
- short ifi_flags; /* IFF_xxx constants from <net/if.h> */
- short ifi_myflags; /* our own IFI_xxx flags */
- int ifi_index; /* interface index */
- struct sockaddr *ifi_addr; /* primary address */
- struct sockaddr *ifi_netmask;
- struct sockaddr *ifi_brdaddr;/* broadcast address */
- struct sockaddr *ifi_dstaddr;/* destination address */
- struct ifi_info *ifi_next; /* next of these structures */
-};
-
-#if defined(AF_INET6) && HAVE_IPV6 && HAVE_LINUX
-#define PROC_IFINET6_PATH "/proc/net/if_inet6"
-extern struct ifi_info *get_ifi_info_linuxv6(int family, int doaliases);
-#endif
-
-#if defined(AF_INET6) && HAVE_IPV6
-#define INET6_ADDRSTRLEN 46 /*Maximum length of IPv6 address */
-#endif
-
-
-
-#define IFI_ALIAS 1 /* ifi_addr is an alias */
-
-/* From the text (Stevens, section 16.6): */
-/* 'Since many programs need to know all the interfaces on a system, we will develop a */
-/* function of our own named get_ifi_info that returns a linked list of structures, one */
-/* for each interface that is currently "up."' */
-extern struct ifi_info *get_ifi_info(int family, int doaliases);
-
-/* 'The free_ifi_info function, which takes a pointer that was */
-/* returned by get_ifi_info and frees all the dynamic memory.' */
-extern void free_ifi_info(struct ifi_info *);
-
-#ifdef NOT_HAVE_DAEMON
-extern int daemon(int nochdir, int noclose);
-#endif
-
-#ifdef __cplusplus
- }
-#endif
-
-#endif
diff --git a/src/tools/mdnssd/mdnssd.pro b/src/tools/mdnssd/mdnssd.pro
deleted file mode 100644
index 2272a5bf617..00000000000
--- a/src/tools/mdnssd/mdnssd.pro
+++ /dev/null
@@ -1,59 +0,0 @@
-#-------------------------------------------------
-#
-# Project created by QtCreator 2011-10-14T10:22:27
-#
-#-------------------------------------------------
-
-QT -= gui
-QT += core
-
-TARGET = mdnssd
-CONFIG += console
-CONFIG -= app_bundle
-
-TEMPLATE = app
-
-include(../../../qtcreator.pri)
-DESTDIR = $$IDE_BIN_PATH
-
-DEFINES += PID_FILE=\\\"/var/run/mdnsd.pid\\\" MDNS_UDS_SERVERPATH=\\\"/var/run/mdnsd\\\" MDNS_DEBUGMSGS=0
-
-SOURCES += \
- uds_daemon.c \
- uDNS.c \
- PosixDaemon.c \
- PlatformCommon.c \
- mDNSUNP.c \
- mDNSPosix.c \
- mDNSDebug.c \
- mDNS.c \
- GenLinkedList.c \
- dnssd_ipc.c \
- DNSDigest.c \
- DNSCommon.c
-
-HEADERS += \
- uds_daemon.h \
- uDNS.h \
- PlatformCommon.h \
- mDNSUNP.h \
- mDNSPosix.h \
- mDNSEmbeddedAPI.h \
- mDNSDebug.h \
- GenLinkedList.h \
- dnssd_ipc.h \
- DNSCommon.h \
- DebugServices.h \
- dns_sd.h
-
-*-g++ {
- QMAKE_CFLAGS += -Wno-unused-but-set-variable
- QMAKE_CXXFLAGS += -Wno-unused-but-set-variable
-}
-linux-* {
-DEFINES += _GNU_SOURCE HAVE_IPV6 NOT_HAVE_SA_LEN USES_NETLINK HAVE_LINUX TARGET_OS_LINUX
-}
-macx {
-DEFINES += HAVE_IPV6 __MAC_OS_X_VERSION_MIN_REQUIRED=__MAC_OS_X_VERSION_10_4 __APPLE_USE_RFC_2292
-}
-
diff --git a/src/tools/mdnssd/uDNS.c b/src/tools/mdnssd/uDNS.c
deleted file mode 100755
index 57cfc1a689e..00000000000
--- a/src/tools/mdnssd/uDNS.c
+++ /dev/null
@@ -1,4927 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2002-2006 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
-
- * To Do:
- * Elimate all mDNSPlatformMemAllocate/mDNSPlatformMemFree from this code -- the core code
- * is supposed to be malloc-free so that it runs in constant memory determined at compile-time.
- * Any dynamic run-time requirements should be handled by the platform layer below or client layer above
- */
-
-#if APPLE_OSX_mDNSResponder
-#include <TargetConditionals.h>
-#endif
-#include "uDNS.h"
-
-#if(defined(_MSC_VER))
- // Disable "assignment within conditional expression".
- // Other compilers understand the convention that if you place the assignment expression within an extra pair
- // of parentheses, this signals to the compiler that you really intended an assignment and no warning is necessary.
- // The Microsoft compiler doesn't understand this convention, so in the absense of any other way to signal
- // to the compiler that the assignment is intentional, we have to just turn this warning off completely.
- #pragma warning(disable:4706)
-#endif
-
-// For domain enumeration and automatic browsing
-// This is the user's DNS search list.
-// In each of these domains we search for our special pointer records (lb._dns-sd._udp.<domain>, etc.)
-// to discover recommended domains for domain enumeration (browse, default browse, registration,
-// default registration) and possibly one or more recommended automatic browsing domains.
-mDNSexport SearchListElem *SearchList = mDNSNULL;
-
-// The value can be set to true by the Platform code e.g., MacOSX uses the plist mechanism
-mDNSBool StrictUnicastOrdering = mDNSfalse;
-
-// We keep track of the number of unicast DNS servers and log a message when we exceed 64.
-// Currently the unicast queries maintain a 64 bit map to track the valid DNS servers for that
-// question. Bit position is the index into the DNS server list. This is done so to try all
-// the servers exactly once before giving up. If we could allocate memory in the core, then
-// arbitrary limitation of 64 DNSServers can be removed.
-mDNSu8 NumUnicastDNSServers = 0;
-#define MAX_UNICAST_DNS_SERVERS 64
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark - General Utility Functions
-#endif
-
-// set retry timestamp for record with exponential backoff
-mDNSlocal void SetRecordRetry(mDNS *const m, AuthRecord *rr, mDNSu32 random)
- {
- rr->LastAPTime = m->timenow;
-
- if (rr->expire && rr->refreshCount < MAX_UPDATE_REFRESH_COUNT)
- {
- mDNSs32 remaining = rr->expire - m->timenow;
- rr->refreshCount++;
- if (remaining > MIN_UPDATE_REFRESH_TIME)
- {
- // Refresh at 70% + random (currently it is 0 to 10%)
- rr->ThisAPInterval = 7 * (remaining/10) + (random ? random : mDNSRandom(remaining/10));
- // Don't update more often than 5 minutes
- if (rr->ThisAPInterval < MIN_UPDATE_REFRESH_TIME)
- rr->ThisAPInterval = MIN_UPDATE_REFRESH_TIME;
- LogInfo("SetRecordRetry refresh in %d of %d for %s",
- rr->ThisAPInterval/mDNSPlatformOneSecond, (rr->expire - m->timenow)/mDNSPlatformOneSecond, ARDisplayString(m, rr));
- }
- else
- {
- rr->ThisAPInterval = MIN_UPDATE_REFRESH_TIME;
- LogInfo("SetRecordRetry clamping to min refresh in %d of %d for %s",
- rr->ThisAPInterval/mDNSPlatformOneSecond, (rr->expire - m->timenow)/mDNSPlatformOneSecond, ARDisplayString(m, rr));
- }
- return;
- }
-
- rr->expire = 0;
-
- rr->ThisAPInterval = rr->ThisAPInterval * QuestionIntervalStep; // Same Retry logic as Unicast Queries
- if (rr->ThisAPInterval < INIT_RECORD_REG_INTERVAL)
- rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL;
- if (rr->ThisAPInterval > MAX_RECORD_REG_INTERVAL)
- rr->ThisAPInterval = MAX_RECORD_REG_INTERVAL;
-
- LogInfo("SetRecordRetry retry in %d ms for %s", rr->ThisAPInterval, ARDisplayString(m, rr));
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark - Name Server List Management
-#endif
-
-mDNSexport DNSServer *mDNS_AddDNSServer(mDNS *const m, const domainname *d, const mDNSInterfaceID interface, const mDNSAddr *addr, const mDNSIPPort port, mDNSBool scoped, mDNSu32 timeout, mDNSBool cellIntf)
- {
- DNSServer **p = &m->DNSServers;
- DNSServer *tmp = mDNSNULL;
-
- if ((NumUnicastDNSServers + 1) > MAX_UNICAST_DNS_SERVERS)
- {
- LogMsg("mDNS_AddDNSServer: DNS server limit of %d reached, not adding this server", MAX_UNICAST_DNS_SERVERS);
- return mDNSNULL;
- }
-
- if (!d) d = (const domainname *)"";
-
- LogInfo("mDNS_AddDNSServer: Adding %#a for %##s, InterfaceID %p, scoped %d", addr, d->c, interface, scoped);
- if (m->mDNS_busy != m->mDNS_reentrancy+1)
- LogMsg("mDNS_AddDNSServer: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy);
-
- while (*p) // Check if we already have this {interface,address,port,domain} tuple registered
- {
- if ((*p)->scoped == scoped && (*p)->interface == interface && (*p)->teststate != DNSServer_Disabled &&
- mDNSSameAddress(&(*p)->addr, addr) && mDNSSameIPPort((*p)->port, port) && SameDomainName(&(*p)->domain, d))
- {
- if (!((*p)->flags & DNSServer_FlagDelete)) debugf("Note: DNS Server %#a:%d for domain %##s (%p) registered more than once", addr, mDNSVal16(port), d->c, interface);
- (*p)->flags &= ~DNSServer_FlagDelete;
- tmp = *p;
- *p = tmp->next;
- tmp->next = mDNSNULL;
- }
- else
- p=&(*p)->next;
- }
-
- if (tmp) *p = tmp; // move to end of list, to ensure ordering from platform layer
- else
- {
- // allocate, add to list
- *p = mDNSPlatformMemAllocate(sizeof(**p));
- if (!*p) LogMsg("Error: mDNS_AddDNSServer - malloc");
- else
- {
- NumUnicastDNSServers++;
- (*p)->scoped = scoped;
- (*p)->interface = interface;
- (*p)->addr = *addr;
- (*p)->port = port;
- (*p)->flags = DNSServer_FlagNew;
- (*p)->teststate = /* DNSServer_Untested */ DNSServer_Passed;
- (*p)->lasttest = m->timenow - INIT_UCAST_POLL_INTERVAL;
- (*p)->timeout = timeout;
- (*p)->cellIntf = cellIntf;
- AssignDomainName(&(*p)->domain, d);
- (*p)->next = mDNSNULL;
- }
- }
- (*p)->penaltyTime = 0;
- return(*p);
- }
-
-// PenalizeDNSServer is called when the number of queries to the unicast
-// DNS server exceeds MAX_UCAST_UNANSWERED_QUERIES or when we receive an
-// error e.g., SERV_FAIL from DNS server.
-mDNSexport void PenalizeDNSServer(mDNS *const m, DNSQuestion *q)
- {
- DNSServer *new;
- DNSServer *orig = q->qDNSServer;
-
- if (m->mDNS_busy != m->mDNS_reentrancy+1)
- LogMsg("PenalizeDNSServer: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy);
-
- // This should never happen. Whenever we change DNS server, we change the ID on the question and hence
- // we should never accept a response after we penalize a DNS server e.g., send two queries, no response,
- // penalize DNS server and no new servers to pick for the question and hence qDNSServer is NULL. If we
- // receive a response now, the DNS server can be NULL. But we won't because the ID already has been
- // changed.
- if (!q->qDNSServer)
- {
- LogMsg("PenalizeDNSServer: ERROR!! Null DNS server for %##s (%s) %d", q->qname.c, DNSTypeName(q->qtype), q->unansweredQueries);
- goto end;
- }
-
- LogInfo("PenalizeDNSServer: Penalizing DNS server %#a:%d question (%##s) for question %p %##s (%s) SuppressUnusable %d",
- &q->qDNSServer->addr, mDNSVal16(q->qDNSServer->port), q->qDNSServer->domain.c, q, q->qname.c, DNSTypeName(q->qtype),
- q->SuppressUnusable);
-
- // If strict ordering of unicast servers needs to be preserved, we just lookup
- // the next best match server below
- //
- // If strict ordering is not required which is the default behavior, we penalize the server
- // for DNSSERVER_PENALTY_TIME. We may also use additional logic e.g., don't penalize for PTR
- // in the future.
-
- if (!StrictUnicastOrdering)
- {
- LogInfo("PenalizeDNSServer: Strict Unicast Ordering is FALSE");
- // We penalize the server so that new queries don't pick this server for DNSSERVER_PENALTY_TIME
- // XXX Include other logic here to see if this server should really be penalized
- //
- if (q->qtype == kDNSType_PTR)
- {
- LogInfo("PenalizeDNSServer: Not Penalizing PTR question");
- }
- else
- {
- LogInfo("PenalizeDNSServer: Penalizing question type %d", q->qtype);
- q->qDNSServer->penaltyTime = NonZeroTime(m->timenow + DNSSERVER_PENALTY_TIME);
- }
- }
- else
- {
- LogInfo("PenalizeDNSServer: Strict Unicast Ordering is TRUE");
- }
-
-end:
- new = GetServerForQuestion(m, q);
-
-
- if (new == orig)
- {
- if (new)
- LogMsg("PenalizeDNSServer: ERROR!! GetServerForQuestion returned the same server %#a:%d", &new->addr,
- mDNSVal16(new->port));
- else
- LogMsg("PenalizeDNSServer: ERROR!! GetServerForQuestion returned the same server NULL");
- q->ThisQInterval = 0; // Inactivate this question so that we dont bombard the network
- }
- else
- {
- // The new DNSServer is set in DNSServerChangeForQuestion
- DNSServerChangeForQuestion(m, q, new);
-
- if (new)
- {
- LogInfo("PenalizeDNSServer: Server for %##s (%s) changed to %#a:%d (%##s)",
- q->qname.c, DNSTypeName(q->qtype), &q->qDNSServer->addr, mDNSVal16(q->qDNSServer->port), q->qDNSServer->domain.c);
- // We want to try the next server immediately. As the question may already have backed off, reset
- // the interval. We do this only the first time when we try all the DNS servers. Once we reached the end of
- // list and retrying all the servers again e.g., at least one server failed to respond in the previous try, we
- // use the normal backoff which is done in uDNS_CheckCurrentQuestion when we send the packet out.
- if (!q->triedAllServersOnce)
- {
- q->ThisQInterval = InitialQuestionInterval;
- q->LastQTime = m->timenow - q->ThisQInterval;
- SetNextQueryTime(m, q);
- }
- }
- else
- {
- // We don't have any more DNS servers for this question. If some server in the list did not return
- // any response, we need to keep retrying till we get a response. uDNS_CheckCurrentQuestion handles
- // this case.
- //
- // If all servers responded with a negative response, We need to do two things. First, generate a
- // negative response so that applications get a reply. We also need to reinitialize the DNS servers
- // so that when the cache expires, we can restart the query.
- //
- // Negative response may be generated in two ways.
- //
- // 1. AnswerQuestionForDNSServerChanges (called from DNSServerChangedForQuestion) might find some
- // cache entries and answer this question.
- // 2. uDNS_CheckCurrentQuestion will create a new cache entry and answer this question
- //
- // For (1), it might be okay to reinitialize the DNS servers here. But for (2), we can't do it here
- // because uDNS_CheckCurrentQuestion will try resending the queries. Hence, to be consistent, we
- // defer reintializing the DNS servers up until generating a negative cache response.
- //
- // Be careful not to touch the ThisQInterval here. For a normal question, when we answer the question
- // in AnswerCurrentQuestionWithResourceRecord will set ThisQInterval to MaxQuestionInterval and hence
- // the next query will not happen until cache expiry. If it is a long lived question,
- // AnswerCurrentQuestionWithResourceRecord will not set it to MaxQuestionInterval. In that case,
- // we want the normal backoff to work.
- LogInfo("PenalizeDNSServer: Server for %p, %##s (%s) changed to NULL, Interval %d", q, q->qname.c, DNSTypeName(q->qtype), q->ThisQInterval);
- }
- q->unansweredQueries = 0;
-
- }
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark - authorization management
-#endif
-
-mDNSlocal DomainAuthInfo *GetAuthInfoForName_direct(mDNS *m, const domainname *const name)
- {
- const domainname *n = name;
- while (n->c[0])
- {
- DomainAuthInfo *ptr;
- for (ptr = m->AuthInfoList; ptr; ptr = ptr->next)
- if (SameDomainName(&ptr->domain, n))
- {
- debugf("GetAuthInfoForName %##s Matched %##s Key name %##s", name->c, ptr->domain.c, ptr->keyname.c);
- return(ptr);
- }
- n = (const domainname *)(n->c + 1 + n->c[0]);
- }
- //LogInfo("GetAuthInfoForName none found for %##s", name->c);
- return mDNSNULL;
- }
-
-// MUST be called with lock held
-mDNSexport DomainAuthInfo *GetAuthInfoForName_internal(mDNS *m, const domainname *const name)
- {
- DomainAuthInfo **p = &m->AuthInfoList;
-
- if (m->mDNS_busy != m->mDNS_reentrancy+1)
- LogMsg("GetAuthInfoForName_internal: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy);
-
- // First purge any dead keys from the list
- while (*p)
- {
- if ((*p)->deltime && m->timenow - (*p)->deltime >= 0 && AutoTunnelUnregistered(*p))
- {
- DNSQuestion *q;
- DomainAuthInfo *info = *p;
- LogInfo("GetAuthInfoForName_internal deleting expired key %##s %##s", info->domain.c, info->keyname.c);
- *p = info->next; // Cut DomainAuthInfo from list *before* scanning our question list updating AuthInfo pointers
- for (q = m->Questions; q; q=q->next)
- if (q->AuthInfo == info)
- {
- q->AuthInfo = GetAuthInfoForName_direct(m, &q->qname);
- debugf("GetAuthInfoForName_internal updated q->AuthInfo from %##s to %##s for %##s (%s)",
- info->domain.c, q->AuthInfo ? q->AuthInfo->domain.c : mDNSNULL, q->qname.c, DNSTypeName(q->qtype));
- }
-
- // Probably not essential, but just to be safe, zero out the secret key data
- // so we don't leave it hanging around in memory
- // (where it could potentially get exposed via some other bug)
- mDNSPlatformMemZero(info, sizeof(*info));
- mDNSPlatformMemFree(info);
- }
- else
- p = &(*p)->next;
- }
-
- return(GetAuthInfoForName_direct(m, name));
- }
-
-mDNSexport DomainAuthInfo *GetAuthInfoForName(mDNS *m, const domainname *const name)
- {
- DomainAuthInfo *d;
- mDNS_Lock(m);
- d = GetAuthInfoForName_internal(m, name);
- mDNS_Unlock(m);
- return(d);
- }
-
-// MUST be called with the lock held
-mDNSexport mStatus mDNS_SetSecretForDomain(mDNS *m, DomainAuthInfo *info,
- const domainname *domain, const domainname *keyname, const char *b64keydata, const domainname *hostname, mDNSIPPort *port, const char *autoTunnelPrefix)
- {
- DNSQuestion *q;
- DomainAuthInfo **p = &m->AuthInfoList;
- if (!info || !b64keydata) { LogMsg("mDNS_SetSecretForDomain: ERROR: info %p b64keydata %p", info, b64keydata); return(mStatus_BadParamErr); }
-
- LogInfo("mDNS_SetSecretForDomain: domain %##s key %##s%s%s", domain->c, keyname->c, autoTunnelPrefix ? " prefix " : "", autoTunnelPrefix ? autoTunnelPrefix : "");
-
- info->AutoTunnel = autoTunnelPrefix;
- AssignDomainName(&info->domain, domain);
- AssignDomainName(&info->keyname, keyname);
- if (hostname)
- AssignDomainName(&info->hostname, hostname);
- else
- info->hostname.c[0] = 0;
- if (port)
- info->port = *port;
- else
- info->port = zeroIPPort;
- mDNS_snprintf(info->b64keydata, sizeof(info->b64keydata), "%s", b64keydata);
-
- if (DNSDigest_ConstructHMACKeyfromBase64(info, b64keydata) < 0)
- {
- LogMsg("mDNS_SetSecretForDomain: ERROR: Could not convert shared secret from base64: domain %##s key %##s %s", domain->c, keyname->c, mDNS_LoggingEnabled ? b64keydata : "");
- return(mStatus_BadParamErr);
- }
-
- // Don't clear deltime until after we've ascertained that b64keydata is valid
- info->deltime = 0;
-
- while (*p && (*p) != info) p=&(*p)->next;
- if (*p) {LogInfo("mDNS_SetSecretForDomain: Domain %##s Already in list", (*p)->domain.c); return(mStatus_AlreadyRegistered);}
-
- // Caution: Only zero AutoTunnelHostRecord.namestorage and AutoTunnelNAT.clientContext AFTER we've determined that this is a NEW DomainAuthInfo
- // being added to the list. Otherwise we risk smashing our AutoTunnel host records and NATOperation that are already active and in use.
- info->AutoTunnelHostRecord.resrec.RecordType = kDNSRecordTypeUnregistered;
- info->AutoTunnelHostRecord.namestorage.c[0] = 0;
- info->AutoTunnelTarget .resrec.RecordType = kDNSRecordTypeUnregistered;
- info->AutoTunnelDeviceInfo.resrec.RecordType = kDNSRecordTypeUnregistered;
- info->AutoTunnelService .resrec.RecordType = kDNSRecordTypeUnregistered;
- info->AutoTunnel6Record .resrec.RecordType = kDNSRecordTypeUnregistered;
- info->AutoTunnelNAT.clientContext = mDNSNULL;
- info->next = mDNSNULL;
- *p = info;
-
- // Check to see if adding this new DomainAuthInfo has changed the credentials for any of our questions
- for (q = m->Questions; q; q=q->next)
- {
- DomainAuthInfo *newinfo = GetAuthInfoForQuestion(m, q);
- if (q->AuthInfo != newinfo)
- {
- debugf("mDNS_SetSecretForDomain updating q->AuthInfo from %##s to %##s for %##s (%s)",
- q->AuthInfo ? q->AuthInfo->domain.c : mDNSNULL,
- newinfo ? newinfo ->domain.c : mDNSNULL, q->qname.c, DNSTypeName(q->qtype));
- q->AuthInfo = newinfo;
- }
- }
-
- return(mStatus_NoError);
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - NAT Traversal
-#endif
-
-mDNSlocal mStatus uDNS_SendNATMsg(mDNS *m, NATTraversalInfo *info)
- {
- mStatus err = mStatus_NoError;
-
- // send msg if we have a router and it is a private address
- if (!mDNSIPv4AddressIsZero(m->Router.ip.v4) && mDNSv4AddrIsRFC1918(&m->Router.ip.v4))
- {
- union { NATAddrRequest NATAddrReq; NATPortMapRequest NATPortReq; } u = { { NATMAP_VERS, NATOp_AddrRequest } } ;
- const mDNSu8 *end = (mDNSu8 *)&u + sizeof(NATAddrRequest);
-
- if (info) // For NATOp_MapUDP and NATOp_MapTCP, fill in additional fields
- {
- mDNSu8 *p = (mDNSu8 *)&u.NATPortReq.NATReq_lease;
- u.NATPortReq.opcode = info->Protocol;
- u.NATPortReq.unused = zeroID;
- u.NATPortReq.intport = info->IntPort;
- u.NATPortReq.extport = info->RequestedPort;
- p[0] = (mDNSu8)((info->NATLease >> 24) & 0xFF);
- p[1] = (mDNSu8)((info->NATLease >> 16) & 0xFF);
- p[2] = (mDNSu8)((info->NATLease >> 8) & 0xFF);
- p[3] = (mDNSu8)( info->NATLease & 0xFF);
- end = (mDNSu8 *)&u + sizeof(NATPortMapRequest);
- }
-
- err = mDNSPlatformSendUDP(m, (mDNSu8 *)&u, end, 0, mDNSNULL, &m->Router, NATPMPPort);
-
-#ifdef _LEGACY_NAT_TRAVERSAL_
- if (mDNSIPPortIsZero(m->UPnPRouterPort) || mDNSIPPortIsZero(m->UPnPSOAPPort)) LNT_SendDiscoveryMsg(m);
- else if (info) err = LNT_MapPort(m, info);
- else err = LNT_GetExternalAddress(m);
-#endif // _LEGACY_NAT_TRAVERSAL_
- }
- return(err);
- }
-
-mDNSexport void RecreateNATMappings(mDNS *const m)
- {
- NATTraversalInfo *n;
- for (n = m->NATTraversals; n; n=n->next)
- {
- n->ExpiryTime = 0; // Mark this mapping as expired
- n->retryInterval = NATMAP_INIT_RETRY;
- n->retryPortMap = m->timenow;
-#ifdef _LEGACY_NAT_TRAVERSAL_
- if (n->tcpInfo.sock) { mDNSPlatformTCPCloseConnection(n->tcpInfo.sock); n->tcpInfo.sock = mDNSNULL; }
-#endif // _LEGACY_NAT_TRAVERSAL_
- }
-
- m->NextScheduledNATOp = m->timenow; // Need to send packets immediately
- }
-
-mDNSexport void natTraversalHandleAddressReply(mDNS *const m, mDNSu16 err, mDNSv4Addr ExtAddr)
- {
- static mDNSu16 last_err = 0;
-
- if (err)
- {
- if (err != last_err) LogMsg("Error getting external address %d", err);
- ExtAddr = zerov4Addr;
- }
- else
- {
- LogInfo("Received external IP address %.4a from NAT", &ExtAddr);
- if (mDNSv4AddrIsRFC1918(&ExtAddr))
- LogMsg("Double NAT (external NAT gateway address %.4a is also a private RFC 1918 address)", &ExtAddr);
- if (mDNSIPv4AddressIsZero(ExtAddr))
- err = NATErr_NetFail; // fake error to handle routers that pathologically report success with the zero address
- }
-
- if (!mDNSSameIPv4Address(m->ExternalAddress, ExtAddr))
- {
- m->ExternalAddress = ExtAddr;
- RecreateNATMappings(m); // Also sets NextScheduledNATOp for us
- }
-
- if (!err) // Success, back-off to maximum interval
- m->retryIntervalGetAddr = NATMAP_MAX_RETRY_INTERVAL;
- else if (!last_err) // Failure after success, retry quickly (then back-off exponentially)
- m->retryIntervalGetAddr = NATMAP_INIT_RETRY;
- // else back-off normally in case of pathological failures
-
- m->retryGetAddr = m->timenow + m->retryIntervalGetAddr;
- if (m->NextScheduledNATOp - m->retryIntervalGetAddr > 0)
- m->NextScheduledNATOp = m->retryIntervalGetAddr;
-
- last_err = err;
- }
-
-// Both places that call NATSetNextRenewalTime() update m->NextScheduledNATOp correctly afterwards
-mDNSlocal void NATSetNextRenewalTime(mDNS *const m, NATTraversalInfo *n)
- {
- n->retryInterval = (n->ExpiryTime - m->timenow)/2;
- if (n->retryInterval < NATMAP_MIN_RETRY_INTERVAL) // Min retry interval is 2 seconds
- n->retryInterval = NATMAP_MIN_RETRY_INTERVAL;
- n->retryPortMap = m->timenow + n->retryInterval;
- }
-
-// Note: When called from handleLNTPortMappingResponse() only pkt->err, pkt->extport and pkt->NATRep_lease fields are filled in
-mDNSexport void natTraversalHandlePortMapReply(mDNS *const m, NATTraversalInfo *n, const mDNSInterfaceID InterfaceID, mDNSu16 err, mDNSIPPort extport, mDNSu32 lease)
- {
- const char *prot = n->Protocol == NATOp_MapUDP ? "UDP" : n->Protocol == NATOp_MapTCP ? "TCP" : "?";
- (void)prot;
- n->NewResult = err;
- if (err || lease == 0 || mDNSIPPortIsZero(extport))
- {
- LogInfo("natTraversalHandlePortMapReply: %p Response %s Port %5d External Port %5d lease %d error %d",
- n, prot, mDNSVal16(n->IntPort), mDNSVal16(extport), lease, err);
- n->retryInterval = NATMAP_MAX_RETRY_INTERVAL;
- n->retryPortMap = m->timenow + NATMAP_MAX_RETRY_INTERVAL;
- // No need to set m->NextScheduledNATOp here, since we're only ever extending the m->retryPortMap time
- if (err == NATErr_Refused) n->NewResult = mStatus_NATPortMappingDisabled;
- else if (err > NATErr_None && err <= NATErr_Opcode) n->NewResult = mStatus_NATPortMappingUnsupported;
- }
- else
- {
- if (lease > 999999999UL / mDNSPlatformOneSecond)
- lease = 999999999UL / mDNSPlatformOneSecond;
- n->ExpiryTime = NonZeroTime(m->timenow + lease * mDNSPlatformOneSecond);
-
- if (!mDNSSameIPPort(n->RequestedPort, extport))
- LogInfo("natTraversalHandlePortMapReply: %p Response %s Port %5d External Port %5d changed to %5d",
- n, prot, mDNSVal16(n->IntPort), mDNSVal16(n->RequestedPort), mDNSVal16(extport));
-
- n->InterfaceID = InterfaceID;
- n->RequestedPort = extport;
-
- LogInfo("natTraversalHandlePortMapReply: %p Response %s Port %5d External Port %5d lease %d",
- n, prot, mDNSVal16(n->IntPort), mDNSVal16(extport), lease);
-
- NATSetNextRenewalTime(m, n); // Got our port mapping; now set timer to renew it at halfway point
- m->NextScheduledNATOp = m->timenow; // May need to invoke client callback immediately
- }
- }
-
-// Must be called with the mDNS_Lock held
-mDNSexport mStatus mDNS_StartNATOperation_internal(mDNS *const m, NATTraversalInfo *traversal)
- {
- NATTraversalInfo **n;
-
- LogInfo("mDNS_StartNATOperation_internal %p Protocol %d IntPort %d RequestedPort %d NATLease %d", traversal,
- traversal->Protocol, mDNSVal16(traversal->IntPort), mDNSVal16(traversal->RequestedPort), traversal->NATLease);
-
- // Note: It important that new traversal requests are appended at the *end* of the list, not prepended at the start
- for (n = &m->NATTraversals; *n; n=&(*n)->next)
- {
- if (traversal == *n)
- {
- LogMsg("Error! Tried to add a NAT traversal that's already in the active list: request %p Prot %d Int %d TTL %d",
- traversal, traversal->Protocol, mDNSVal16(traversal->IntPort), traversal->NATLease);
- #if ForceAlerts
- *(long*)0 = 0;
- #endif
- return(mStatus_AlreadyRegistered);
- }
- if (traversal->Protocol && traversal->Protocol == (*n)->Protocol && mDNSSameIPPort(traversal->IntPort, (*n)->IntPort) &&
- !mDNSSameIPPort(traversal->IntPort, SSHPort))
- LogMsg("Warning: Created port mapping request %p Prot %d Int %d TTL %d "
- "duplicates existing port mapping request %p Prot %d Int %d TTL %d",
- traversal, traversal->Protocol, mDNSVal16(traversal->IntPort), traversal->NATLease,
- *n, (*n) ->Protocol, mDNSVal16((*n) ->IntPort), (*n) ->NATLease);
- }
-
- // Initialize necessary fields
- traversal->next = mDNSNULL;
- traversal->ExpiryTime = 0;
- traversal->retryInterval = NATMAP_INIT_RETRY;
- traversal->retryPortMap = m->timenow;
- traversal->NewResult = mStatus_NoError;
- traversal->ExternalAddress = onesIPv4Addr;
- traversal->ExternalPort = zeroIPPort;
- traversal->Lifetime = 0;
- traversal->Result = mStatus_NoError;
-
- // set default lease if necessary
- if (!traversal->NATLease) traversal->NATLease = NATMAP_DEFAULT_LEASE;
-
-#ifdef _LEGACY_NAT_TRAVERSAL_
- mDNSPlatformMemZero(&traversal->tcpInfo, sizeof(traversal->tcpInfo));
-#endif // _LEGACY_NAT_TRAVERSAL_
-
- if (!m->NATTraversals) // If this is our first NAT request, kick off an address request too
- {
- m->retryGetAddr = m->timenow;
- m->retryIntervalGetAddr = NATMAP_INIT_RETRY;
- }
-
- m->NextScheduledNATOp = m->timenow; // This will always trigger sending the packet ASAP, and generate client callback if necessary
-
- *n = traversal; // Append new NATTraversalInfo to the end of our list
-
- return(mStatus_NoError);
- }
-
-// Must be called with the mDNS_Lock held
-mDNSexport mStatus mDNS_StopNATOperation_internal(mDNS *m, NATTraversalInfo *traversal)
- {
- mDNSBool unmap = mDNStrue;
- NATTraversalInfo *p;
- NATTraversalInfo **ptr = &m->NATTraversals;
-
- while (*ptr && *ptr != traversal) ptr=&(*ptr)->next;
- if (*ptr) *ptr = (*ptr)->next; // If we found it, cut this NATTraversalInfo struct from our list
- else
- {
- LogMsg("mDNS_StopNATOperation_internal: NATTraversalInfo %p not found in list", traversal);
- return(mStatus_BadReferenceErr);
- }
-
- LogInfo("mDNS_StopNATOperation_internal %p %d %d %d %d", traversal,
- traversal->Protocol, mDNSVal16(traversal->IntPort), mDNSVal16(traversal->RequestedPort), traversal->NATLease);
-
- if (m->CurrentNATTraversal == traversal)
- m->CurrentNATTraversal = m->CurrentNATTraversal->next;
-
- if (traversal->Protocol)
- for (p = m->NATTraversals; p; p=p->next)
- if (traversal->Protocol == p->Protocol && mDNSSameIPPort(traversal->IntPort, p->IntPort))
- {
- if (!mDNSSameIPPort(traversal->IntPort, SSHPort))
- LogMsg("Warning: Removed port mapping request %p Prot %d Int %d TTL %d "
- "duplicates existing port mapping request %p Prot %d Int %d TTL %d",
- traversal, traversal->Protocol, mDNSVal16(traversal->IntPort), traversal->NATLease,
- p, p ->Protocol, mDNSVal16(p ->IntPort), p ->NATLease);
- unmap = mDNSfalse;
- }
-
- if (traversal->ExpiryTime && unmap)
- {
- traversal->NATLease = 0;
- traversal->retryInterval = 0;
- uDNS_SendNATMsg(m, traversal);
- }
-
- // Even if we DIDN'T make a successful UPnP mapping yet, we might still have a partially-open TCP connection we need to clean up
- #ifdef _LEGACY_NAT_TRAVERSAL_
- {
- mStatus err = LNT_UnmapPort(m, traversal);
- if (err) LogMsg("Legacy NAT Traversal - unmap request failed with error %d", err);
- }
- #endif // _LEGACY_NAT_TRAVERSAL_
-
- return(mStatus_NoError);
- }
-
-mDNSexport mStatus mDNS_StartNATOperation(mDNS *const m, NATTraversalInfo *traversal)
- {
- mStatus status;
- mDNS_Lock(m);
- status = mDNS_StartNATOperation_internal(m, traversal);
- mDNS_Unlock(m);
- return(status);
- }
-
-mDNSexport mStatus mDNS_StopNATOperation(mDNS *const m, NATTraversalInfo *traversal)
- {
- mStatus status;
- mDNS_Lock(m);
- status = mDNS_StopNATOperation_internal(m, traversal);
- mDNS_Unlock(m);
- return(status);
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - Long-Lived Queries
-#endif
-
-// Lock must be held -- otherwise m->timenow is undefined
-mDNSlocal void StartLLQPolling(mDNS *const m, DNSQuestion *q)
- {
- debugf("StartLLQPolling: %##s", q->qname.c);
- q->state = LLQ_Poll;
- q->ThisQInterval = INIT_UCAST_POLL_INTERVAL;
- // We want to send our poll query ASAP, but the "+ 1" is because if we set the time to now,
- // we risk causing spurious "SendQueries didn't send all its queries" log messages
- q->LastQTime = m->timenow - q->ThisQInterval + 1;
- SetNextQueryTime(m, q);
-#if APPLE_OSX_mDNSResponder
- UpdateAutoTunnelDomainStatuses(m);
-#endif
- }
-
-mDNSlocal mDNSu8 *putLLQ(DNSMessage *const msg, mDNSu8 *ptr, const DNSQuestion *const question, const LLQOptData *const data)
- {
- AuthRecord rr;
- ResourceRecord *opt = &rr.resrec;
- rdataOPT *optRD;
-
- //!!!KRS when we implement multiple llqs per message, we'll need to memmove anything past the question section
- ptr = putQuestion(msg, ptr, msg->data + AbsoluteMaxDNSMessageData, &question->qname, question->qtype, question->qclass);
- if (!ptr) { LogMsg("ERROR: putLLQ - putQuestion"); return mDNSNULL; }
-
- // locate OptRR if it exists, set pointer to end
- // !!!KRS implement me
-
- // format opt rr (fields not specified are zero-valued)
- mDNS_SetupResourceRecord(&rr, mDNSNULL, mDNSInterface_Any, kDNSType_OPT, kStandardTTL, kDNSRecordTypeKnownUnique, AuthRecordAny, mDNSNULL, mDNSNULL);
- opt->rrclass = NormalMaxDNSMessageData;
- opt->rdlength = sizeof(rdataOPT); // One option in this OPT record
- opt->rdestimate = sizeof(rdataOPT);
-
- optRD = &rr.resrec.rdata->u.opt[0];
- optRD->opt = kDNSOpt_LLQ;
- optRD->u.llq = *data;
- ptr = PutResourceRecordTTLJumbo(msg, ptr, &msg->h.numAdditionals, opt, 0);
- if (!ptr) { LogMsg("ERROR: putLLQ - PutResourceRecordTTLJumbo"); return mDNSNULL; }
-
- return ptr;
- }
-
-// Normally we'd just request event packets be sent directly to m->LLQNAT.ExternalPort, except...
-// with LLQs over TLS/TCP we're doing a weird thing where instead of requesting packets be sent to ExternalAddress:ExternalPort
-// we're requesting that packets be sent to ExternalPort, but at the source address of our outgoing TCP connection.
-// Normally, after going through the NAT gateway, the source address of our outgoing TCP connection is the same as ExternalAddress,
-// so this is fine, except when the TCP connection ends up going over a VPN tunnel instead.
-// To work around this, if we find that the source address for our TCP connection is not a private address, we tell the Dot Mac
-// LLQ server to send events to us directly at port 5353 on that address, instead of at our mapped external NAT port.
-
-mDNSlocal mDNSu16 GetLLQEventPort(const mDNS *const m, const mDNSAddr *const dst)
- {
- mDNSAddr src;
- mDNSPlatformSourceAddrForDest(&src, dst);
- //LogMsg("GetLLQEventPort: src %#a for dst %#a (%d)", &src, dst, mDNSv4AddrIsRFC1918(&src.ip.v4) ? mDNSVal16(m->LLQNAT.ExternalPort) : 0);
- return(mDNSv4AddrIsRFC1918(&src.ip.v4) ? mDNSVal16(m->LLQNAT.ExternalPort) : mDNSVal16(MulticastDNSPort));
- }
-
-// Normally called with llq set.
-// May be called with llq NULL, when retransmitting a lost Challenge Response
-mDNSlocal void sendChallengeResponse(mDNS *const m, DNSQuestion *const q, const LLQOptData *llq)
- {
- mDNSu8 *responsePtr = m->omsg.data;
- LLQOptData llqBuf;
-
- if (q->tcp) { LogMsg("sendChallengeResponse: ERROR!!: question %##s (%s) tcp non-NULL", q->qname.c, DNSTypeName(q->qtype)); return; }
-
- if (PrivateQuery(q)) { LogMsg("sendChallengeResponse: ERROR!!: Private Query %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); return; }
-
- if (q->ntries++ == kLLQ_MAX_TRIES)
- {
- LogMsg("sendChallengeResponse: %d failed attempts for LLQ %##s", kLLQ_MAX_TRIES, q->qname.c);
- StartLLQPolling(m,q);
- return;
- }
-
- if (!llq) // Retransmission: need to make a new LLQOptData
- {
- llqBuf.vers = kLLQ_Vers;
- llqBuf.llqOp = kLLQOp_Setup;
- llqBuf.err = LLQErr_NoError; // Don't need to tell server UDP notification port when sending over UDP
- llqBuf.id = q->id;
- llqBuf.llqlease = q->ReqLease;
- llq = &llqBuf;
- }
-
- q->LastQTime = m->timenow;
- q->ThisQInterval = q->tcp ? 0 : (kLLQ_INIT_RESEND * q->ntries * mDNSPlatformOneSecond); // If using TCP, don't need to retransmit
- SetNextQueryTime(m, q);
-
- // To simulate loss of challenge response packet, uncomment line below
- //if (q->ntries == 1) return;
-
- InitializeDNSMessage(&m->omsg.h, q->TargetQID, uQueryFlags);
- responsePtr = putLLQ(&m->omsg, responsePtr, q, llq);
- if (responsePtr)
- {
- mStatus err = mDNSSendDNSMessage(m, &m->omsg, responsePtr, mDNSInterface_Any, q->LocalSocket, &q->servAddr, q->servPort, mDNSNULL, mDNSNULL);
- if (err) { LogMsg("sendChallengeResponse: mDNSSendDNSMessage%s failed: %d", q->tcp ? " (TCP)" : "", err); }
- }
- else StartLLQPolling(m,q);
- }
-
-mDNSlocal void SetLLQTimer(mDNS *const m, DNSQuestion *const q, const LLQOptData *const llq)
- {
- mDNSs32 lease = (mDNSs32)llq->llqlease * mDNSPlatformOneSecond;
- q->ReqLease = llq->llqlease;
- q->LastQTime = m->timenow;
- q->expire = m->timenow + lease;
- q->ThisQInterval = lease/2 + mDNSRandom(lease/10);
- debugf("SetLLQTimer setting %##s (%s) to %d %d", q->qname.c, DNSTypeName(q->qtype), lease/mDNSPlatformOneSecond, q->ThisQInterval/mDNSPlatformOneSecond);
- SetNextQueryTime(m, q);
- }
-
-mDNSlocal void recvSetupResponse(mDNS *const m, mDNSu8 rcode, DNSQuestion *const q, const LLQOptData *const llq)
- {
- if (rcode && rcode != kDNSFlag1_RC_NXDomain)
- { LogMsg("ERROR: recvSetupResponse %##s (%s) - rcode && rcode != kDNSFlag1_RC_NXDomain", q->qname.c, DNSTypeName(q->qtype)); return; }
-
- if (llq->llqOp != kLLQOp_Setup)
- { LogMsg("ERROR: recvSetupResponse %##s (%s) - bad op %d", q->qname.c, DNSTypeName(q->qtype), llq->llqOp); return; }
-
- if (llq->vers != kLLQ_Vers)
- { LogMsg("ERROR: recvSetupResponse %##s (%s) - bad vers %d", q->qname.c, DNSTypeName(q->qtype), llq->vers); return; }
-
- if (q->state == LLQ_InitialRequest)
- {
- //LogInfo("Got LLQ_InitialRequest");
-
- if (llq->err) { LogMsg("recvSetupResponse - received llq->err %d from server", llq->err); StartLLQPolling(m,q); return; }
-
- if (q->ReqLease != llq->llqlease)
- debugf("recvSetupResponse: requested lease %lu, granted lease %lu", q->ReqLease, llq->llqlease);
-
- // cache expiration in case we go to sleep before finishing setup
- q->ReqLease = llq->llqlease;
- q->expire = m->timenow + ((mDNSs32)llq->llqlease * mDNSPlatformOneSecond);
-
- // update state
- q->state = LLQ_SecondaryRequest;
- q->id = llq->id;
- q->ntries = 0; // first attempt to send response
- sendChallengeResponse(m, q, llq);
- }
- else if (q->state == LLQ_SecondaryRequest)
- {
- //LogInfo("Got LLQ_SecondaryRequest");
-
- // Fix this immediately if not sooner. Copy the id from the LLQOptData into our DNSQuestion struct. This is only
- // an issue for private LLQs, because we skip parts 2 and 3 of the handshake. This is related to a bigger
- // problem of the current implementation of TCP LLQ setup: we're not handling state transitions correctly
- // if the server sends back SERVFULL or STATIC.
- if (PrivateQuery(q))
- {
- LogInfo("Private LLQ_SecondaryRequest; copying id %08X%08X", llq->id.l[0], llq->id.l[1]);
- q->id = llq->id;
- }
-
- if (llq->err) { LogMsg("ERROR: recvSetupResponse %##s (%s) code %d from server", q->qname.c, DNSTypeName(q->qtype), llq->err); StartLLQPolling(m,q); return; }
- if (!mDNSSameOpaque64(&q->id, &llq->id))
- { LogMsg("recvSetupResponse - ID changed. discarding"); return; } // this can happen rarely (on packet loss + reordering)
- q->state = LLQ_Established;
- q->ntries = 0;
- SetLLQTimer(m, q, llq);
-#if APPLE_OSX_mDNSResponder
- UpdateAutoTunnelDomainStatuses(m);
-#endif
- }
- }
-
-mDNSexport uDNS_LLQType uDNS_recvLLQResponse(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *const end,
- const mDNSAddr *const srcaddr, const mDNSIPPort srcport, DNSQuestion **matchQuestion)
- {
- DNSQuestion pktQ, *q;
- if (msg->h.numQuestions && getQuestion(msg, msg->data, end, 0, &pktQ))
- {
- const rdataOPT *opt = GetLLQOptData(m, msg, end);
-
- for (q = m->Questions; q; q = q->next)
- {
- if (!mDNSOpaque16IsZero(q->TargetQID) && q->LongLived && q->qtype == pktQ.qtype && q->qnamehash == pktQ.qnamehash && SameDomainName(&q->qname, &pktQ.qname))
- {
- debugf("uDNS_recvLLQResponse found %##s (%s) %d %#a %#a %X %X %X %X %d",
- q->qname.c, DNSTypeName(q->qtype), q->state, srcaddr, &q->servAddr,
- opt ? opt->u.llq.id.l[0] : 0, opt ? opt->u.llq.id.l[1] : 0, q->id.l[0], q->id.l[1], opt ? opt->u.llq.llqOp : 0);
- if (q->state == LLQ_Poll) debugf("uDNS_LLQ_Events: q->state == LLQ_Poll msg->h.id %d q->TargetQID %d", mDNSVal16(msg->h.id), mDNSVal16(q->TargetQID));
- if (q->state == LLQ_Poll && mDNSSameOpaque16(msg->h.id, q->TargetQID))
- {
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
-
- // Don't reset the state to IntialRequest as we may write that to the dynamic store
- // and PrefPane might wrongly think that we are "Starting" instead of "Polling". If
- // we are in polling state because of NAT-PMP disabled or DoubleNAT, next LLQNATCallback
- // would kick us back to LLQInitialRequest. So, resetting the state here may not be useful.
- //
- // If we have a good NAT (neither NAT-PMP disabled nor Double-NAT), then we should not be
- // possibly in polling state. To be safe, we want to retry from the start in that case
- // as there may not be another LLQNATCallback
- //
- // NOTE: We can be in polling state if we cannot resolve the SOA record i.e, servAddr is set to
- // all ones. In that case, we would set it in LLQ_InitialRequest as it overrides the NAT-PMP or
- // Double-NAT state.
- if (!mDNSAddressIsOnes(&q->servAddr) && !mDNSIPPortIsZero(m->LLQNAT.ExternalPort) &&
- !m->LLQNAT.Result)
- {
- debugf("uDNS_recvLLQResponse got poll response; moving to LLQ_InitialRequest for %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- q->state = LLQ_InitialRequest;
- }
- q->servPort = zeroIPPort; // Clear servPort so that startLLQHandshake will retry the GetZoneData processing
- q->ThisQInterval = LLQ_POLL_INTERVAL + mDNSRandom(LLQ_POLL_INTERVAL/10); // Retry LLQ setup in approx 15 minutes
- q->LastQTime = m->timenow;
- SetNextQueryTime(m, q);
- *matchQuestion = q;
- return uDNS_LLQ_Entire; // uDNS_LLQ_Entire means flush stale records; assume a large effective TTL
- }
- // Note: In LLQ Event packets, the msg->h.id does not match our q->TargetQID, because in that case the msg->h.id nonce is selected by the server
- else if (opt && q->state == LLQ_Established && opt->u.llq.llqOp == kLLQOp_Event && mDNSSameOpaque64(&opt->u.llq.id, &q->id))
- {
- mDNSu8 *ackEnd;
- //debugf("Sending LLQ ack for %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- InitializeDNSMessage(&m->omsg.h, msg->h.id, ResponseFlags);
- ackEnd = putLLQ(&m->omsg, m->omsg.data, q, &opt->u.llq);
- if (ackEnd) mDNSSendDNSMessage(m, &m->omsg, ackEnd, mDNSInterface_Any, q->LocalSocket, srcaddr, srcport, mDNSNULL, mDNSNULL);
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
- debugf("uDNS_LLQ_Events: q->state == LLQ_Established msg->h.id %d q->TargetQID %d", mDNSVal16(msg->h.id), mDNSVal16(q->TargetQID));
- *matchQuestion = q;
- return uDNS_LLQ_Events;
- }
- if (opt && mDNSSameOpaque16(msg->h.id, q->TargetQID))
- {
- if (q->state == LLQ_Established && opt->u.llq.llqOp == kLLQOp_Refresh && mDNSSameOpaque64(&opt->u.llq.id, &q->id) && msg->h.numAdditionals && !msg->h.numAnswers)
- {
- if (opt->u.llq.err != LLQErr_NoError) LogMsg("recvRefreshReply: received error %d from server", opt->u.llq.err);
- else
- {
- //LogInfo("Received refresh confirmation ntries %d for %##s (%s)", q->ntries, q->qname.c, DNSTypeName(q->qtype));
- // If we're waiting to go to sleep, then this LLQ deletion may have been the thing
- // we were waiting for, so schedule another check to see if we can sleep now.
- if (opt->u.llq.llqlease == 0 && m->SleepLimit) m->NextScheduledSPRetry = m->timenow;
- GrantCacheExtensions(m, q, opt->u.llq.llqlease);
- SetLLQTimer(m, q, &opt->u.llq);
- q->ntries = 0;
- }
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
- *matchQuestion = q;
- return uDNS_LLQ_Ignore;
- }
- if (q->state < LLQ_Established && mDNSSameAddress(srcaddr, &q->servAddr))
- {
- LLQ_State oldstate = q->state;
- recvSetupResponse(m, msg->h.flags.b[1] & kDNSFlag1_RC_Mask, q, &opt->u.llq);
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
- // We have a protocol anomaly here in the LLQ definition.
- // Both the challenge packet from the server and the ack+answers packet have opt->u.llq.llqOp == kLLQOp_Setup.
- // However, we need to treat them differently:
- // The challenge packet has no answers in it, and tells us nothing about whether our cache entries
- // are still valid, so this packet should not cause us to do anything that messes with our cache.
- // The ack+answers packet gives us the whole truth, so we should handle it by updating our cache
- // to match the answers in the packet, and only the answers in the packet.
- *matchQuestion = q;
- return (oldstate == LLQ_SecondaryRequest ? uDNS_LLQ_Entire : uDNS_LLQ_Ignore);
- }
- }
- }
- }
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
- }
- *matchQuestion = mDNSNULL;
- return uDNS_LLQ_Not;
- }
-
-// Stub definition of TCPSocket_struct so we can access flags field. (Rest of TCPSocket_struct is platform-dependent.)
-struct TCPSocket_struct { TCPSocketFlags flags; /* ... */ };
-
-// tcpCallback is called to handle events (e.g. connection opening and data reception) on TCP connections for
-// Private DNS operations -- private queries, private LLQs, private record updates and private service updates
-mDNSlocal void tcpCallback(TCPSocket *sock, void *context, mDNSBool ConnectionEstablished, mStatus err)
- {
- tcpInfo_t *tcpInfo = (tcpInfo_t *)context;
- mDNSBool closed = mDNSfalse;
- mDNS *m = tcpInfo->m;
- DNSQuestion *const q = tcpInfo->question;
- tcpInfo_t **backpointer =
- q ? &q ->tcp :
- tcpInfo->rr ? &tcpInfo->rr ->tcp : mDNSNULL;
- if (backpointer && *backpointer != tcpInfo)
- LogMsg("tcpCallback: %d backpointer %p incorrect tcpInfo %p question %p rr %p",
- mDNSPlatformTCPGetFD(tcpInfo->sock), *backpointer, tcpInfo, q, tcpInfo->rr);
-
- if (err) goto exit;
-
- if (ConnectionEstablished)
- {
- mDNSu8 *end = ((mDNSu8*) &tcpInfo->request) + tcpInfo->requestLen;
- DomainAuthInfo *AuthInfo;
-
- // Defensive coding for <rdar://problem/5546824> Crash in mDNSResponder at GetAuthInfoForName_internal + 366
- // Don't know yet what's causing this, but at least we can be cautious and try to avoid crashing if we find our pointers in an unexpected state
- if (tcpInfo->rr && tcpInfo->rr->resrec.name != &tcpInfo->rr->namestorage)
- LogMsg("tcpCallback: ERROR: tcpInfo->rr->resrec.name %p != &tcpInfo->rr->namestorage %p",
- tcpInfo->rr->resrec.name, &tcpInfo->rr->namestorage);
- if (tcpInfo->rr && tcpInfo->rr-> resrec.name != &tcpInfo->rr-> namestorage) return;
-
- AuthInfo = tcpInfo->rr ? GetAuthInfoForName(m, tcpInfo->rr->resrec.name) : mDNSNULL;
-
- // connection is established - send the message
- if (q && q->LongLived && q->state == LLQ_Established)
- {
- // Lease renewal over TCP, resulting from opening a TCP connection in sendLLQRefresh
- end = ((mDNSu8*) &tcpInfo->request) + tcpInfo->requestLen;
- }
- else if (q && q->LongLived && q->state != LLQ_Poll && !mDNSIPPortIsZero(m->LLQNAT.ExternalPort) && !mDNSIPPortIsZero(q->servPort))
- {
- // Notes:
- // If we have a NAT port mapping, ExternalPort is the external port
- // If we have a routable address so we don't need a port mapping, ExternalPort is the same as our own internal port
- // If we need a NAT port mapping but can't get one, then ExternalPort is zero
- LLQOptData llqData; // set llq rdata
- llqData.vers = kLLQ_Vers;
- llqData.llqOp = kLLQOp_Setup;
- llqData.err = GetLLQEventPort(m, &tcpInfo->Addr); // We're using TCP; tell server what UDP port to send notifications to
- LogInfo("tcpCallback: eventPort %d", llqData.err);
- llqData.id = zeroOpaque64;
- llqData.llqlease = kLLQ_DefLease;
- InitializeDNSMessage(&tcpInfo->request.h, q->TargetQID, uQueryFlags);
- end = putLLQ(&tcpInfo->request, tcpInfo->request.data, q, &llqData);
- if (!end) { LogMsg("ERROR: tcpCallback - putLLQ"); err = mStatus_UnknownErr; goto exit; }
- AuthInfo = q->AuthInfo; // Need to add TSIG to this message
- q->ntries = 0; // Reset ntries so that tcp/tls connection failures don't affect sendChallengeResponse failures
- }
- else if (q)
- {
- // LLQ Polling mode or non-LLQ uDNS over TCP
- InitializeDNSMessage(&tcpInfo->request.h, q->TargetQID, uQueryFlags);
- end = putQuestion(&tcpInfo->request, tcpInfo->request.data, tcpInfo->request.data + AbsoluteMaxDNSMessageData, &q->qname, q->qtype, q->qclass);
- AuthInfo = q->AuthInfo; // Need to add TSIG to this message
- }
-
- err = mDNSSendDNSMessage(m, &tcpInfo->request, end, mDNSInterface_Any, mDNSNULL, &tcpInfo->Addr, tcpInfo->Port, sock, AuthInfo);
- if (err) { debugf("ERROR: tcpCallback: mDNSSendDNSMessage - %d", err); err = mStatus_UnknownErr; goto exit; }
-
- // Record time we sent this question
- if (q)
- {
- mDNS_Lock(m);
- q->LastQTime = m->timenow;
- if (q->ThisQInterval < (256 * mDNSPlatformOneSecond)) // Now we have a TCP connection open, make sure we wait at least 256 seconds before retrying
- q->ThisQInterval = (256 * mDNSPlatformOneSecond);
- SetNextQueryTime(m, q);
- mDNS_Unlock(m);
- }
- }
- else
- {
- long n;
- if (tcpInfo->nread < 2) // First read the two-byte length preceeding the DNS message
- {
- mDNSu8 *lenptr = (mDNSu8 *)&tcpInfo->replylen;
- n = mDNSPlatformReadTCP(sock, lenptr + tcpInfo->nread, 2 - tcpInfo->nread, &closed);
- if (n < 0)
- {
- LogMsg("ERROR: tcpCallback - attempt to read message length failed (%d)", n);
- err = mStatus_ConnFailed;
- goto exit;
- }
- else if (closed)
- {
- // It's perfectly fine for this socket to close after the first reply. The server might
- // be sending gratuitous replies using UDP and doesn't have a need to leave the TCP socket open.
- // We'll only log this event if we've never received a reply before.
- // BIND 9 appears to close an idle connection after 30 seconds.
- if (tcpInfo->numReplies == 0)
- {
- LogMsg("ERROR: socket closed prematurely tcpInfo->nread = %d", tcpInfo->nread);
- err = mStatus_ConnFailed;
- goto exit;
- }
- else
- {
- // Note that we may not be doing the best thing if an error occurs after we've sent a second request
- // over this tcp connection. That is, we only track whether we've received at least one response
- // which may have been to a previous request sent over this tcp connection.
- if (backpointer) *backpointer = mDNSNULL; // Clear client backpointer FIRST so we don't risk double-disposing our tcpInfo_t
- DisposeTCPConn(tcpInfo);
- return;
- }
- }
-
- tcpInfo->nread += n;
- if (tcpInfo->nread < 2) goto exit;
-
- tcpInfo->replylen = (mDNSu16)((mDNSu16)lenptr[0] << 8 | lenptr[1]);
- if (tcpInfo->replylen < sizeof(DNSMessageHeader))
- { LogMsg("ERROR: tcpCallback - length too short (%d bytes)", tcpInfo->replylen); err = mStatus_UnknownErr; goto exit; }
-
- tcpInfo->reply = mDNSPlatformMemAllocate(tcpInfo->replylen);
- if (!tcpInfo->reply) { LogMsg("ERROR: tcpCallback - malloc failed"); err = mStatus_NoMemoryErr; goto exit; }
- }
-
- n = mDNSPlatformReadTCP(sock, ((char *)tcpInfo->reply) + (tcpInfo->nread - 2), tcpInfo->replylen - (tcpInfo->nread - 2), &closed);
-
- if (n < 0)
- {
- LogMsg("ERROR: tcpCallback - read returned %d", n);
- err = mStatus_ConnFailed;
- goto exit;
- }
- else if (closed)
- {
- if (tcpInfo->numReplies == 0)
- {
- LogMsg("ERROR: socket closed prematurely tcpInfo->nread = %d", tcpInfo->nread);
- err = mStatus_ConnFailed;
- goto exit;
- }
- else
- {
- // Note that we may not be doing the best thing if an error occurs after we've sent a second request
- // over this tcp connection. That is, we only track whether we've received at least one response
- // which may have been to a previous request sent over this tcp connection.
- if (backpointer) *backpointer = mDNSNULL; // Clear client backpointer FIRST so we don't risk double-disposing our tcpInfo_t
- DisposeTCPConn(tcpInfo);
- return;
- }
- }
-
- tcpInfo->nread += n;
-
- if ((tcpInfo->nread - 2) == tcpInfo->replylen)
- {
- mDNSBool tls;
- DNSMessage *reply = tcpInfo->reply;
- mDNSu8 *end = (mDNSu8 *)tcpInfo->reply + tcpInfo->replylen;
- mDNSAddr Addr = tcpInfo->Addr;
- mDNSIPPort Port = tcpInfo->Port;
- mDNSIPPort srcPort = zeroIPPort;
- tcpInfo->numReplies++;
- tcpInfo->reply = mDNSNULL; // Detach reply buffer from tcpInfo_t, to make sure client callback can't cause it to be disposed
- tcpInfo->nread = 0;
- tcpInfo->replylen = 0;
-
- // If we're going to dispose this connection, do it FIRST, before calling client callback
- // Note: Sleep code depends on us clearing *backpointer here -- it uses the clearing of rr->tcp
- // as the signal that the DNS deregistration operation with the server has completed, and the machine may now sleep
- // If we clear the tcp pointer in the question, mDNSCoreReceiveResponse cannot find a matching question. Hence
- // we store the minimal information i.e., the source port of the connection in the question itself.
- // Dereference sock before it is disposed in DisposeTCPConn below.
-
- if (sock->flags & kTCPSocketFlags_UseTLS) tls = mDNStrue;
- else tls = mDNSfalse;
-
- if (q && q->tcp) {srcPort = q->tcp->SrcPort; q->tcpSrcPort = srcPort;}
-
- if (backpointer)
- if (!q || !q->LongLived || m->SleepState)
- { *backpointer = mDNSNULL; DisposeTCPConn(tcpInfo); }
-
- mDNSCoreReceive(m, reply, end, &Addr, Port, tls ? (mDNSAddr *)1 : mDNSNULL, srcPort, 0);
- // USE CAUTION HERE: Invoking mDNSCoreReceive may have caused the environment to change, including canceling this operation itself
-
- mDNSPlatformMemFree(reply);
- return;
- }
- }
-
-exit:
-
- if (err)
- {
- // Clear client backpointer FIRST -- that way if one of the callbacks cancels its operation
- // we won't end up double-disposing our tcpInfo_t
- if (backpointer) *backpointer = mDNSNULL;
-
- mDNS_Lock(m); // Need to grab the lock to get m->timenow
-
- if (q)
- {
- if (q->ThisQInterval == 0)
- {
- // We get here when we fail to establish a new TCP/TLS connection that would have been used for a new LLQ request or an LLQ renewal.
- // Note that ThisQInterval is also zero when sendChallengeResponse resends the LLQ request on an extant TCP/TLS connection.
- q->LastQTime = m->timenow;
- if (q->LongLived)
- {
- // We didn't get the chance to send our request packet before the TCP/TLS connection failed.
- // We want to retry quickly, but want to back off exponentially in case the server is having issues.
- // Since ThisQInterval was 0, we can't just multiply by QuestionIntervalStep, we must track the number
- // of TCP/TLS connection failures using ntries.
- mDNSu32 count = q->ntries + 1; // want to wait at least 1 second before retrying
-
- q->ThisQInterval = InitialQuestionInterval;
-
- for (;count;count--)
- q->ThisQInterval *= QuestionIntervalStep;
-
- if (q->ThisQInterval > LLQ_POLL_INTERVAL)
- q->ThisQInterval = LLQ_POLL_INTERVAL;
- else
- q->ntries++;
-
- LogMsg("tcpCallback: stream connection for LLQ %##s (%s) failed %d times, retrying in %d ms", q->qname.c, DNSTypeName(q->qtype), q->ntries, q->ThisQInterval);
- }
- else
- {
- q->ThisQInterval = MAX_UCAST_POLL_INTERVAL;
- LogMsg("tcpCallback: stream connection for %##s (%s) failed, retrying in %d ms", q->qname.c, DNSTypeName(q->qtype), q->ThisQInterval);
- }
- SetNextQueryTime(m, q);
- }
- else if (NextQSendTime(q) - m->timenow > (q->LongLived ? LLQ_POLL_INTERVAL : MAX_UCAST_POLL_INTERVAL))
- {
- // If we get an error and our next scheduled query for this question is more than the max interval from now,
- // reset the next query to ensure we wait no longer the maximum interval from now before trying again.
- q->LastQTime = m->timenow;
- q->ThisQInterval = q->LongLived ? LLQ_POLL_INTERVAL : MAX_UCAST_POLL_INTERVAL;
- SetNextQueryTime(m, q);
- LogMsg("tcpCallback: stream connection for %##s (%s) failed, retrying in %d ms", q->qname.c, DNSTypeName(q->qtype), q->ThisQInterval);
- }
-
- // We're about to dispose of the TCP connection, so we must reset the state to retry over TCP/TLS
- // because sendChallengeResponse will send the query via UDP if we don't have a tcp pointer.
- // Resetting to LLQ_InitialRequest will cause uDNS_CheckCurrentQuestion to call startLLQHandshake, which
- // will attempt to establish a new tcp connection.
- if (q->LongLived && q->state == LLQ_SecondaryRequest)
- q->state = LLQ_InitialRequest;
-
- // ConnFailed may happen if the server sends a TCP reset or TLS fails, in which case we want to retry establishing the LLQ
- // quickly rather than switching to polling mode. This case is handled by the above code to set q->ThisQInterval just above.
- // If the error isn't ConnFailed, then the LLQ is in bad shape, so we switch to polling mode.
- if (err != mStatus_ConnFailed)
- {
- if (q->LongLived && q->state != LLQ_Poll) StartLLQPolling(m, q);
- }
- }
-
- mDNS_Unlock(m);
-
- DisposeTCPConn(tcpInfo);
- }
- }
-
-mDNSlocal tcpInfo_t *MakeTCPConn(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *const end,
- TCPSocketFlags flags, const mDNSAddr *const Addr, const mDNSIPPort Port, domainname *hostname,
- DNSQuestion *const question, AuthRecord *const rr)
- {
- mStatus err;
- mDNSIPPort srcport = zeroIPPort;
- tcpInfo_t *info;
-
- if ((flags & kTCPSocketFlags_UseTLS) && (!hostname || !hostname->c[0]))
- { LogMsg("MakeTCPConn: TLS connection being setup with NULL hostname"); return mDNSNULL; }
-
- info = (tcpInfo_t *)mDNSPlatformMemAllocate(sizeof(tcpInfo_t));
- if (!info) { LogMsg("ERROR: MakeTCP - memallocate failed"); return(mDNSNULL); }
- mDNSPlatformMemZero(info, sizeof(tcpInfo_t));
-
- info->m = m;
- info->sock = mDNSPlatformTCPSocket(m, flags, &srcport);
- info->requestLen = 0;
- info->question = question;
- info->rr = rr;
- info->Addr = *Addr;
- info->Port = Port;
- info->reply = mDNSNULL;
- info->replylen = 0;
- info->nread = 0;
- info->numReplies = 0;
- info->SrcPort = srcport;
-
- if (msg)
- {
- info->requestLen = (int) (end - ((mDNSu8*)msg));
- mDNSPlatformMemCopy(&info->request, msg, info->requestLen);
- }
-
- if (!info->sock) { LogMsg("MakeTCPConn: unable to create TCP socket"); mDNSPlatformMemFree(info); return(mDNSNULL); }
- err = mDNSPlatformTCPConnect(info->sock, Addr, Port, hostname, (question ? question->InterfaceID : mDNSNULL), tcpCallback, info);
-
- // Probably suboptimal here.
- // Instead of returning mDNSNULL here on failure, we should probably invoke the callback with an error code.
- // That way clients can put all the error handling and retry/recovery code in one place,
- // instead of having to handle immediate errors in one place and async errors in another.
- // Also: "err == mStatus_ConnEstablished" probably never happens.
-
- // Don't need to log "connection failed" in customer builds -- it happens quite often during sleep, wake, configuration changes, etc.
- if (err == mStatus_ConnEstablished) { tcpCallback(info->sock, info, mDNStrue, mStatus_NoError); }
- else if (err != mStatus_ConnPending ) { LogInfo("MakeTCPConn: connection failed"); DisposeTCPConn(info); return(mDNSNULL); }
- return(info);
- }
-
-mDNSexport void DisposeTCPConn(struct tcpInfo_t *tcp)
- {
- mDNSPlatformTCPCloseConnection(tcp->sock);
- if (tcp->reply) mDNSPlatformMemFree(tcp->reply);
- mDNSPlatformMemFree(tcp);
- }
-
-// Lock must be held
-mDNSexport void startLLQHandshake(mDNS *m, DNSQuestion *q)
- {
- if (mDNSIPv4AddressIsOnes(m->LLQNAT.ExternalAddress))
- {
- LogInfo("startLLQHandshake: waiting for NAT status for %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- q->ThisQInterval = LLQ_POLL_INTERVAL + mDNSRandom(LLQ_POLL_INTERVAL/10); // Retry in approx 15 minutes
- q->LastQTime = m->timenow;
- SetNextQueryTime(m, q);
- return;
- }
-
- // Either we don't have NAT-PMP support (ExternalPort is zero) or behind a Double NAT that may or
- // may not have NAT-PMP support (NATResult is non-zero)
- if (mDNSIPPortIsZero(m->LLQNAT.ExternalPort) || m->LLQNAT.Result)
- {
- LogInfo("startLLQHandshake: Cannot receive inbound packets; will poll for %##s (%s) External Port %d, NAT Result %d",
- q->qname.c, DNSTypeName(q->qtype), mDNSVal16(m->LLQNAT.ExternalPort), m->LLQNAT.Result);
- StartLLQPolling(m, q);
- return;
- }
-
- if (mDNSIPPortIsZero(q->servPort))
- {
- debugf("startLLQHandshake: StartGetZoneData for %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- q->ThisQInterval = LLQ_POLL_INTERVAL + mDNSRandom(LLQ_POLL_INTERVAL/10); // Retry in approx 15 minutes
- q->LastQTime = m->timenow;
- SetNextQueryTime(m, q);
- q->servAddr = zeroAddr;
- // We know q->servPort is zero because of check above
- if (q->nta) CancelGetZoneData(m, q->nta);
- q->nta = StartGetZoneData(m, &q->qname, ZoneServiceLLQ, LLQGotZoneData, q);
- return;
- }
-
- if (PrivateQuery(q))
- {
- if (q->tcp) LogInfo("startLLQHandshake: Disposing existing TCP connection for %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- if (q->tcp) { DisposeTCPConn(q->tcp); q->tcp = mDNSNULL; }
- if (!q->nta)
- {
- // Normally we lookup the zone data and then call this function. And we never free the zone data
- // for "PrivateQuery". But sometimes this can happen due to some race conditions. When we
- // switch networks, we might end up "Polling" the network e.g., we are behind a Double NAT.
- // When we poll, we free the zone information as we send the query to the server (See
- // PrivateQueryGotZoneData). The NAT callback (LLQNATCallback) may happen soon after that. If we
- // are still behind Double NAT, we would have returned early in this function. But we could
- // have switched to a network with no NATs and we should get the zone data again.
- LogInfo("startLLQHandshake: nta is NULL for %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- q->nta = StartGetZoneData(m, &q->qname, ZoneServiceLLQ, LLQGotZoneData, q);
- return;
- }
- else if (!q->nta->Host.c[0])
- {
- // This should not happen. If it happens, we print a log and MakeTCPConn will fail if it can't find a hostname
- LogMsg("startLLQHandshake: ERROR!!: nta non NULL for %##s (%s) but HostName %d NULL, LongLived %d", q->qname.c, DNSTypeName(q->qtype), q->nta->Host.c[0], q->LongLived);
- }
- q->tcp = MakeTCPConn(m, mDNSNULL, mDNSNULL, kTCPSocketFlags_UseTLS, &q->servAddr, q->servPort, &q->nta->Host, q, mDNSNULL);
- if (!q->tcp)
- q->ThisQInterval = mDNSPlatformOneSecond * 5; // If TCP failed (transient networking glitch) try again in five seconds
- else
- {
- q->state = LLQ_SecondaryRequest; // Right now, for private DNS, we skip the four-way LLQ handshake
- q->ReqLease = kLLQ_DefLease;
- q->ThisQInterval = 0;
- }
- q->LastQTime = m->timenow;
- SetNextQueryTime(m, q);
- }
- else
- {
- debugf("startLLQHandshake: m->AdvertisedV4 %#a%s Server %#a:%d%s %##s (%s)",
- &m->AdvertisedV4, mDNSv4AddrIsRFC1918(&m->AdvertisedV4.ip.v4) ? " (RFC 1918)" : "",
- &q->servAddr, mDNSVal16(q->servPort), mDNSAddrIsRFC1918(&q->servAddr) ? " (RFC 1918)" : "",
- q->qname.c, DNSTypeName(q->qtype));
-
- if (q->ntries++ >= kLLQ_MAX_TRIES)
- {
- LogMsg("startLLQHandshake: %d failed attempts for LLQ %##s Polling.", kLLQ_MAX_TRIES, q->qname.c);
- StartLLQPolling(m, q);
- }
- else
- {
- mDNSu8 *end;
- LLQOptData llqData;
-
- // set llq rdata
- llqData.vers = kLLQ_Vers;
- llqData.llqOp = kLLQOp_Setup;
- llqData.err = LLQErr_NoError; // Don't need to tell server UDP notification port when sending over UDP
- llqData.id = zeroOpaque64;
- llqData.llqlease = kLLQ_DefLease;
-
- InitializeDNSMessage(&m->omsg.h, q->TargetQID, uQueryFlags);
- end = putLLQ(&m->omsg, m->omsg.data, q, &llqData);
- if (!end) { LogMsg("ERROR: startLLQHandshake - putLLQ"); StartLLQPolling(m,q); return; }
-
- mDNSSendDNSMessage(m, &m->omsg, end, mDNSInterface_Any, q->LocalSocket, &q->servAddr, q->servPort, mDNSNULL, mDNSNULL);
-
- // update question state
- q->state = LLQ_InitialRequest;
- q->ReqLease = kLLQ_DefLease;
- q->ThisQInterval = (kLLQ_INIT_RESEND * mDNSPlatformOneSecond);
- q->LastQTime = m->timenow;
- SetNextQueryTime(m, q);
- }
- }
- }
-
-// forward declaration so GetServiceTarget can do reverse lookup if needed
-mDNSlocal void GetStaticHostname(mDNS *m);
-
-mDNSexport const domainname *GetServiceTarget(mDNS *m, AuthRecord *const rr)
- {
- debugf("GetServiceTarget %##s", rr->resrec.name->c);
-
- if (!rr->AutoTarget) // If not automatically tracking this host's current name, just return the existing target
- return(&rr->resrec.rdata->u.srv.target);
- else
- {
-#if APPLE_OSX_mDNSResponder
- DomainAuthInfo *AuthInfo = GetAuthInfoForName_internal(m, rr->resrec.name);
- if (AuthInfo && AuthInfo->AutoTunnel)
- {
- // If this AutoTunnel is not yet active, start it now (which entails activating its NAT Traversal request,
- // which will subsequently advertise the appropriate records when the NAT Traversal returns a result)
- if (!AuthInfo->AutoTunnelNAT.clientContext && m->AutoTunnelHostAddr.b[0])
- {
- LogInfo("GetServiceTarget: Calling SetupLocalAutoTunnelInterface_internal");
- SetupLocalAutoTunnelInterface_internal(m, mDNStrue);
- }
- if (AuthInfo->AutoTunnelHostRecord.namestorage.c[0] == 0) return(mDNSNULL);
- debugf("GetServiceTarget: Returning %##s", AuthInfo->AutoTunnelHostRecord.namestorage.c);
- return(&AuthInfo->AutoTunnelHostRecord.namestorage);
- }
- else
-#endif // APPLE_OSX_mDNSResponder
- {
- const int srvcount = CountLabels(rr->resrec.name);
- HostnameInfo *besthi = mDNSNULL, *hi;
- int best = 0;
- for (hi = m->Hostnames; hi; hi = hi->next)
- if (hi->arv4.state == regState_Registered || hi->arv4.state == regState_Refresh ||
- hi->arv6.state == regState_Registered || hi->arv6.state == regState_Refresh)
- {
- int x, hostcount = CountLabels(&hi->fqdn);
- for (x = hostcount < srvcount ? hostcount : srvcount; x > 0 && x > best; x--)
- if (SameDomainName(SkipLeadingLabels(rr->resrec.name, srvcount - x), SkipLeadingLabels(&hi->fqdn, hostcount - x)))
- { best = x; besthi = hi; }
- }
-
- if (besthi) return(&besthi->fqdn);
- }
- if (m->StaticHostname.c[0]) return(&m->StaticHostname);
- else GetStaticHostname(m); // asynchronously do reverse lookup for primary IPv4 address
- LogInfo("GetServiceTarget: Returning NULL for %s", ARDisplayString(m, rr));
- return(mDNSNULL);
- }
- }
-
-mDNSlocal const domainname *PUBLIC_UPDATE_SERVICE_TYPE = (const domainname*)"\x0B_dns-update" "\x04_udp";
-mDNSlocal const domainname *PUBLIC_LLQ_SERVICE_TYPE = (const domainname*)"\x08_dns-llq" "\x04_udp";
-
-mDNSlocal const domainname *PRIVATE_UPDATE_SERVICE_TYPE = (const domainname*)"\x0F_dns-update-tls" "\x04_tcp";
-mDNSlocal const domainname *PRIVATE_QUERY_SERVICE_TYPE = (const domainname*)"\x0E_dns-query-tls" "\x04_tcp";
-mDNSlocal const domainname *PRIVATE_LLQ_SERVICE_TYPE = (const domainname*)"\x0C_dns-llq-tls" "\x04_tcp";
-
-#define ZoneDataSRV(X) (\
- (X)->ZoneService == ZoneServiceUpdate ? ((X)->ZonePrivate ? PRIVATE_UPDATE_SERVICE_TYPE : PUBLIC_UPDATE_SERVICE_TYPE) : \
- (X)->ZoneService == ZoneServiceQuery ? ((X)->ZonePrivate ? PRIVATE_QUERY_SERVICE_TYPE : (const domainname*)"" ) : \
- (X)->ZoneService == ZoneServiceLLQ ? ((X)->ZonePrivate ? PRIVATE_LLQ_SERVICE_TYPE : PUBLIC_LLQ_SERVICE_TYPE ) : (const domainname*)"")
-
-// Forward reference: GetZoneData_StartQuery references GetZoneData_QuestionCallback, and
-// GetZoneData_QuestionCallback calls GetZoneData_StartQuery
-mDNSlocal mStatus GetZoneData_StartQuery(mDNS *const m, ZoneData *zd, mDNSu16 qtype);
-
-// GetZoneData_QuestionCallback is called from normal client callback context (core API calls allowed)
-mDNSlocal void GetZoneData_QuestionCallback(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord)
- {
- ZoneData *zd = (ZoneData*)question->QuestionContext;
-
- debugf("GetZoneData_QuestionCallback: %s %s", AddRecord ? "Add" : "Rmv", RRDisplayString(m, answer));
-
- if (!AddRecord) return; // Don't care about REMOVE events
- if (AddRecord == QC_addnocache && answer->rdlength == 0) return; // Don't care about transient failure indications
- if (answer->rrtype != question->qtype) return; // Don't care about CNAMEs
-
- if (answer->rrtype == kDNSType_SOA)
- {
- debugf("GetZoneData GOT SOA %s", RRDisplayString(m, answer));
- mDNS_StopQuery(m, question);
- if (question->ThisQInterval != -1)
- LogMsg("GetZoneData_QuestionCallback: Question %##s (%s) ThisQInterval %d not -1", question->qname.c, DNSTypeName(question->qtype), question->ThisQInterval);
- if (answer->rdlength)
- {
- AssignDomainName(&zd->ZoneName, answer->name);
- zd->ZoneClass = answer->rrclass;
- AssignDomainName(&zd->question.qname, &zd->ZoneName);
- GetZoneData_StartQuery(m, zd, kDNSType_SRV);
- }
- else if (zd->CurrentSOA->c[0])
- {
- DomainAuthInfo *AuthInfo = GetAuthInfoForName(m, zd->CurrentSOA);
- if (AuthInfo && AuthInfo->AutoTunnel)
- {
- // To keep the load on the server down, we don't chop down on
- // SOA lookups for AutoTunnels
- LogInfo("GetZoneData_QuestionCallback: not chopping labels for %##s", zd->CurrentSOA->c);
- zd->ZoneDataCallback(m, mStatus_NoSuchNameErr, zd);
- }
- else
- {
- zd->CurrentSOA = (domainname *)(zd->CurrentSOA->c + zd->CurrentSOA->c[0]+1);
- AssignDomainName(&zd->question.qname, zd->CurrentSOA);
- GetZoneData_StartQuery(m, zd, kDNSType_SOA);
- }
- }
- else
- {
- LogInfo("GetZoneData recursed to root label of %##s without finding SOA", zd->ChildName.c);
- zd->ZoneDataCallback(m, mStatus_NoSuchNameErr, zd);
- }
- }
- else if (answer->rrtype == kDNSType_SRV)
- {
- debugf("GetZoneData GOT SRV %s", RRDisplayString(m, answer));
- mDNS_StopQuery(m, question);
- if (question->ThisQInterval != -1)
- LogMsg("GetZoneData_QuestionCallback: Question %##s (%s) ThisQInterval %d not -1", question->qname.c, DNSTypeName(question->qtype), question->ThisQInterval);
-// Right now we don't want to fail back to non-encrypted operations
-// If the AuthInfo has the AutoTunnel field set, then we want private or nothing
-// <rdar://problem/5687667> BTMM: Don't fallback to unencrypted operations when SRV lookup fails
-#if 0
- if (!answer->rdlength && zd->ZonePrivate && zd->ZoneService != ZoneServiceQuery)
- {
- zd->ZonePrivate = mDNSfalse; // Causes ZoneDataSRV() to yield a different SRV name when building the query
- GetZoneData_StartQuery(m, zd, kDNSType_SRV); // Try again, non-private this time
- }
- else
-#endif
- {
- if (answer->rdlength)
- {
- AssignDomainName(&zd->Host, &answer->rdata->u.srv.target);
- zd->Port = answer->rdata->u.srv.port;
- AssignDomainName(&zd->question.qname, &zd->Host);
- GetZoneData_StartQuery(m, zd, kDNSType_A);
- }
- else
- {
- zd->ZonePrivate = mDNSfalse;
- zd->Host.c[0] = 0;
- zd->Port = zeroIPPort;
- zd->Addr = zeroAddr;
- zd->ZoneDataCallback(m, mStatus_NoError, zd);
- }
- }
- }
- else if (answer->rrtype == kDNSType_A)
- {
- debugf("GetZoneData GOT A %s", RRDisplayString(m, answer));
- mDNS_StopQuery(m, question);
- if (question->ThisQInterval != -1)
- LogMsg("GetZoneData_QuestionCallback: Question %##s (%s) ThisQInterval %d not -1", question->qname.c, DNSTypeName(question->qtype), question->ThisQInterval);
- zd->Addr.type = mDNSAddrType_IPv4;
- zd->Addr.ip.v4 = (answer->rdlength == 4) ? answer->rdata->u.ipv4 : zerov4Addr;
- // In order to simulate firewalls blocking our outgoing TCP connections, returning immediate ICMP errors or TCP resets,
- // the code below will make us try to connect to loopback, resulting in an immediate "port unreachable" failure.
- // This helps us test to make sure we handle this case gracefully
- // <rdar://problem/5607082> BTMM: mDNSResponder taking 100 percent CPU after upgrading to 10.5.1
-#if 0
- zd->Addr.ip.v4.b[0] = 127;
- zd->Addr.ip.v4.b[1] = 0;
- zd->Addr.ip.v4.b[2] = 0;
- zd->Addr.ip.v4.b[3] = 1;
-#endif
- // The caller needs to free the memory when done with zone data
- zd->ZoneDataCallback(m, mStatus_NoError, zd);
- }
- }
-
-// GetZoneData_StartQuery is called from normal client context (lock not held, or client callback)
-mDNSlocal mStatus GetZoneData_StartQuery(mDNS *const m, ZoneData *zd, mDNSu16 qtype)
- {
- if (qtype == kDNSType_SRV)
- {
- AssignDomainName(&zd->question.qname, ZoneDataSRV(zd));
- AppendDomainName(&zd->question.qname, &zd->ZoneName);
- debugf("lookupDNSPort %##s", zd->question.qname.c);
- }
-
- // CancelGetZoneData can get called at any time. We should stop the question if it has not been
- // stopped already. A value of -1 for ThisQInterval indicates that the question is not active
- // yet.
- zd->question.ThisQInterval = -1;
- zd->question.InterfaceID = mDNSInterface_Any;
- zd->question.Target = zeroAddr;
- //zd->question.qname.c[0] = 0; // Already set
- zd->question.qtype = qtype;
- zd->question.qclass = kDNSClass_IN;
- zd->question.LongLived = mDNSfalse;
- zd->question.ExpectUnique = mDNStrue;
- zd->question.ForceMCast = mDNSfalse;
- zd->question.ReturnIntermed = mDNStrue;
- zd->question.SuppressUnusable = mDNSfalse;
- zd->question.SearchListIndex = 0;
- zd->question.AppendSearchDomains = 0;
- zd->question.RetryWithSearchDomains = mDNSfalse;
- zd->question.TimeoutQuestion = 0;
- zd->question.WakeOnResolve = 0;
- zd->question.qnameOrig = mDNSNULL;
- zd->question.QuestionCallback = GetZoneData_QuestionCallback;
- zd->question.QuestionContext = zd;
-
- //LogMsg("GetZoneData_StartQuery %##s (%s) %p", zd->question.qname.c, DNSTypeName(zd->question.qtype), zd->question.Private);
- return(mDNS_StartQuery(m, &zd->question));
- }
-
-// StartGetZoneData is an internal routine (i.e. must be called with the lock already held)
-mDNSexport ZoneData *StartGetZoneData(mDNS *const m, const domainname *const name, const ZoneService target, ZoneDataCallback callback, void *ZoneDataContext)
- {
- DomainAuthInfo *AuthInfo = GetAuthInfoForName_internal(m, name);
- int initialskip = (AuthInfo && AuthInfo->AutoTunnel) ? DomainNameLength(name) - DomainNameLength(&AuthInfo->domain) : 0;
- ZoneData *zd = (ZoneData*)mDNSPlatformMemAllocate(sizeof(ZoneData));
- if (!zd) { LogMsg("ERROR: StartGetZoneData - mDNSPlatformMemAllocate failed"); return mDNSNULL; }
- mDNSPlatformMemZero(zd, sizeof(ZoneData));
- AssignDomainName(&zd->ChildName, name);
- zd->ZoneService = target;
- zd->CurrentSOA = (domainname *)(&zd->ChildName.c[initialskip]);
- zd->ZoneName.c[0] = 0;
- zd->ZoneClass = 0;
- zd->Host.c[0] = 0;
- zd->Port = zeroIPPort;
- zd->Addr = zeroAddr;
- zd->ZonePrivate = AuthInfo && AuthInfo->AutoTunnel ? mDNStrue : mDNSfalse;
- zd->ZoneDataCallback = callback;
- zd->ZoneDataContext = ZoneDataContext;
-
- zd->question.QuestionContext = zd;
-
- mDNS_DropLockBeforeCallback(); // GetZoneData_StartQuery expects to be called from a normal callback, so we emulate that here
- if (AuthInfo && AuthInfo->AutoTunnel && !mDNSIPPortIsZero(AuthInfo->port))
- {
- LogInfo("StartGetZoneData: Bypassing SOA, SRV query for %##s", AuthInfo->domain.c);
- // We bypass SOA and SRV queries if we know the hostname and port already from the configuration.
- // Today this is only true for AutoTunnel. As we bypass, we need to infer a few things:
- //
- // 1. Zone name is the same as the AuthInfo domain
- // 2. ZoneClass is kDNSClass_IN which should be a safe assumption
- //
- // If we want to make this bypass mechanism work for non-AutoTunnels also, (1) has to hold
- // good. Otherwise, it has to be configured also.
-
- AssignDomainName(&zd->ZoneName, &AuthInfo->domain);
- zd->ZoneClass = kDNSClass_IN;
- AssignDomainName(&zd->Host, &AuthInfo->hostname);
- zd->Port = AuthInfo->port;
- AssignDomainName(&zd->question.qname, &zd->Host);
- GetZoneData_StartQuery(m, zd, kDNSType_A);
- }
- else
- {
- if (AuthInfo && AuthInfo->AutoTunnel) LogInfo("StartGetZoneData: Not Bypassing SOA, SRV query for %##s", AuthInfo->domain.c);
- AssignDomainName(&zd->question.qname, zd->CurrentSOA);
- GetZoneData_StartQuery(m, zd, kDNSType_SOA);
- }
- mDNS_ReclaimLockAfterCallback();
-
- return zd;
- }
-
-// Returns if the question is a GetZoneData question. These questions are special in
-// that they are created internally while resolving a private query or LLQs.
-mDNSexport mDNSBool IsGetZoneDataQuestion(DNSQuestion *q)
- {
- if (q->QuestionCallback == GetZoneData_QuestionCallback) return(mDNStrue);
- else return(mDNSfalse);
- }
-
-// GetZoneData queries are a special case -- even if we have a key for them, we don't do them privately,
-// because that would result in an infinite loop (i.e. to do a private query we first need to get
-// the _dns-query-tls SRV record for the zone, and we can't do *that* privately because to do so
-// we'd need to already know the _dns-query-tls SRV record.
-// Also, as a general rule, we never do SOA queries privately
-mDNSexport DomainAuthInfo *GetAuthInfoForQuestion(mDNS *m, const DNSQuestion *const q) // Must be called with lock held
- {
- if (q->QuestionCallback == GetZoneData_QuestionCallback) return(mDNSNULL);
- if (q->qtype == kDNSType_SOA ) return(mDNSNULL);
- return(GetAuthInfoForName_internal(m, &q->qname));
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark - host name and interface management
-#endif
-
-mDNSlocal void SendRecordRegistration(mDNS *const m, AuthRecord *rr);
-mDNSlocal void SendRecordDeregistration(mDNS *m, AuthRecord *rr);
-mDNSlocal mDNSBool IsRecordMergeable(mDNS *const m, AuthRecord *rr, mDNSs32 time);
-
-// When this function is called, service record is already deregistered. We just
-// have to deregister the PTR and TXT records.
-mDNSlocal void UpdateAllServiceRecords(mDNS *const m, AuthRecord *rr, mDNSBool reg)
- {
- AuthRecord *r, *srvRR;
-
- if (rr->resrec.rrtype != kDNSType_SRV) { LogMsg("UpdateAllServiceRecords:ERROR!! ResourceRecord not a service record %s", ARDisplayString(m, rr)); return; }
-
- if (reg && rr->state == regState_NoTarget) { LogMsg("UpdateAllServiceRecords:ERROR!! SRV record %s in noTarget state during registration", ARDisplayString(m, rr)); return; }
-
- LogInfo("UpdateAllServiceRecords: ResourceRecord %s", ARDisplayString(m, rr));
-
- for (r = m->ResourceRecords; r; r=r->next)
- {
- if (!AuthRecord_uDNS(r)) continue;
- srvRR = mDNSNULL;
- if (r->resrec.rrtype == kDNSType_PTR)
- srvRR = r->Additional1;
- else if (r->resrec.rrtype == kDNSType_TXT)
- srvRR = r->DependentOn;
- if (srvRR && srvRR->resrec.rrtype != kDNSType_SRV)
- LogMsg("UpdateAllServiceRecords: ERROR!! Resource record %s wrong, expecting SRV type", ARDisplayString(m, srvRR));
- if (srvRR == rr)
- {
- if (!reg)
- {
- LogInfo("UpdateAllServiceRecords: deregistering %s", ARDisplayString(m, r));
- r->SRVChanged = mDNStrue;
- r->ThisAPInterval = INIT_RECORD_REG_INTERVAL;
- r->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL;
- r->state = regState_DeregPending;
- }
- else
- {
- // Clearing SRVchanged is a safety measure. If our pevious dereg never
- // came back and we had a target change, we are starting fresh
- r->SRVChanged = mDNSfalse;
- // if it is already registered or in the process of registering, then don't
- // bother re-registering. This happens today for non-BTMM domains where the
- // TXT and PTR get registered before SRV records because of the delay in
- // getting the port mapping. There is no point in re-registering the TXT
- // and PTR records.
- if ((r->state == regState_Registered) ||
- (r->state == regState_Pending && r->nta && !mDNSIPv4AddressIsZero(r->nta->Addr.ip.v4)))
- LogInfo("UpdateAllServiceRecords: not registering %s, state %d", ARDisplayString(m, r), r->state);
- else
- {
- LogInfo("UpdateAllServiceRecords: registering %s, state %d", ARDisplayString(m, r), r->state);
- ActivateUnicastRegistration(m, r);
- }
- }
- }
- }
- }
-
-// Called in normal client context (lock not held)
-// Currently only supports SRV records for nat mapping
-mDNSlocal void CompleteRecordNatMap(mDNS *m, NATTraversalInfo *n)
- {
- const domainname *target;
- domainname *srvt;
- AuthRecord *rr = (AuthRecord *)n->clientContext;
- debugf("SRVNatMap complete %.4a IntPort %u ExternalPort %u NATLease %u", &n->ExternalAddress, mDNSVal16(n->IntPort), mDNSVal16(n->ExternalPort), n->NATLease);
-
- if (!rr) { LogMsg("CompleteRecordNatMap called with unknown AuthRecord object"); return; }
- if (!n->NATLease) { LogMsg("CompleteRecordNatMap No NATLease for %s", ARDisplayString(m, rr)); return; }
-
- if (rr->resrec.rrtype != kDNSType_SRV) {LogMsg("CompleteRecordNatMap: Not a service record %s", ARDisplayString(m, rr)); return; }
-
- if (rr->resrec.RecordType == kDNSRecordTypeDeregistering) { LogInfo("CompleteRecordNatMap called for %s, Service deregistering", ARDisplayString(m, rr)); return; }
-
- if (rr->state == regState_DeregPending) { LogInfo("CompleteRecordNatMap called for %s, record in DeregPending", ARDisplayString(m, rr)); return; }
-
- // As we free the zone info after registering/deregistering with the server (See hndlRecordUpdateReply),
- // we need to restart the get zone data and nat mapping request to get the latest mapping result as we can't handle it
- // at this moment. Restart from the beginning.
- if (!rr->nta || mDNSIPv4AddressIsZero(rr->nta->Addr.ip.v4))
- {
- LogInfo("CompleteRecordNatMap called for %s but no zone information!", ARDisplayString(m, rr));
- // We need to clear out the NATinfo state so that it will result in re-acquiring the mapping
- // and hence this callback called again.
- if (rr->NATinfo.clientContext)
- {
- mDNS_StopNATOperation_internal(m, &rr->NATinfo);
- rr->NATinfo.clientContext = mDNSNULL;
- }
- rr->state = regState_Pending;
- rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL;
- rr->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL;
- return;
- }
-
- mDNS_Lock(m);
- // Reevaluate the target always as Target could have changed while
- // we were getting the port mapping (See UpdateOneSRVRecord)
- target = GetServiceTarget(m, rr);
- srvt = GetRRDomainNameTarget(&rr->resrec);
- if (!target || target->c[0] == 0 || mDNSIPPortIsZero(n->ExternalPort))
- {
- if (target && target->c[0])
- LogInfo("CompleteRecordNatMap - Target %##s for ResourceRecord %##s, ExternalPort %d", target->c, rr->resrec.name->c, mDNSVal16(n->ExternalPort));
- else
- LogInfo("CompleteRecordNatMap - no target for %##s, ExternalPort %d", rr->resrec.name->c, mDNSVal16(n->ExternalPort));
- if (srvt) srvt->c[0] = 0;
- rr->state = regState_NoTarget;
- rr->resrec.rdlength = rr->resrec.rdestimate = 0;
- mDNS_Unlock(m);
- UpdateAllServiceRecords(m, rr, mDNSfalse);
- return;
- }
- LogInfo("CompleteRecordNatMap - Target %##s for ResourceRecord %##s, ExternalPort %d", target->c, rr->resrec.name->c, mDNSVal16(n->ExternalPort));
- // This function might get called multiple times during a network transition event. Previosuly, we could
- // have put the SRV record in NoTarget state above and deregistered all the other records. When this
- // function gets called again with a non-zero ExternalPort, we need to set the target and register the
- // other records again.
- if (srvt && !SameDomainName(srvt, target))
- {
- AssignDomainName(srvt, target);
- SetNewRData(&rr->resrec, mDNSNULL, 0); // Update rdlength, rdestimate, rdatahash
- }
-
- // SRVChanged is set when when the target of the SRV record changes (See UpdateOneSRVRecord).
- // As a result of the target change, we might register just that SRV Record if it was
- // previously registered and we have a new target OR deregister SRV (and the associated
- // PTR/TXT records) if we don't have a target anymore. When we get a response from the server,
- // SRVChanged state tells that we registered/deregistered because of a target change
- // and hence handle accordingly e.g., if we deregistered, put the records in NoTarget state OR
- // if we registered then put it in Registered state.
- //
- // Here, we are registering all the records again from the beginning. Treat this as first time
- // registration rather than a temporary target change.
- rr->SRVChanged = mDNSfalse;
-
- // We want IsRecordMergeable to check whether it is a record whose update can be
- // sent with others. We set the time before we call IsRecordMergeable, so that
- // it does not fail this record based on time. We are interested in other checks
- // at this time
- rr->state = regState_Pending;
- rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL;
- rr->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL;
- if (IsRecordMergeable(m, rr, m->timenow + MERGE_DELAY_TIME))
- // Delay the record registration by MERGE_DELAY_TIME so that we can merge them
- // into one update
- rr->LastAPTime += MERGE_DELAY_TIME;
- mDNS_Unlock(m);
- // We call this always even though it may not be necessary always e.g., normal registration
- // process where TXT and PTR gets registered followed by the SRV record after it gets
- // the port mapping. In that case, UpdateAllServiceRecords handles the optimization. The
- // update of TXT and PTR record is required if we entered noTargetState before as explained
- // above.
- UpdateAllServiceRecords(m, rr, mDNStrue);
- }
-
-mDNSlocal void StartRecordNatMap(mDNS *m, AuthRecord *rr)
- {
- const mDNSu8 *p;
- mDNSu8 protocol;
-
- if (rr->resrec.rrtype != kDNSType_SRV)
- {
- LogInfo("StartRecordNatMap: Resource Record %##s type %d, not supported", rr->resrec.name->c, rr->resrec.rrtype);
- return;
- }
- p = rr->resrec.name->c;
- //Assume <Service Instance>.<App Protocol>.<Transport protocol>.<Name>
- // Skip the first two labels to get to the transport protocol
- if (p[0]) p += 1 + p[0];
- if (p[0]) p += 1 + p[0];
- if (SameDomainLabel(p, (mDNSu8 *)"\x4" "_tcp")) protocol = NATOp_MapTCP;
- else if (SameDomainLabel(p, (mDNSu8 *)"\x4" "_udp")) protocol = NATOp_MapUDP;
- else { LogMsg("StartRecordNatMap: could not determine transport protocol of service %##s", rr->resrec.name->c); return; }
-
- //LogMsg("StartRecordNatMap: clientContext %p IntPort %d srv.port %d %s",
- // rr->NATinfo.clientContext, mDNSVal16(rr->NATinfo.IntPort), mDNSVal16(rr->resrec.rdata->u.srv.port), ARDisplayString(m, rr));
- if (rr->NATinfo.clientContext) mDNS_StopNATOperation_internal(m, &rr->NATinfo);
- rr->NATinfo.Protocol = protocol;
-
- // Shouldn't be trying to set IntPort here --
- // BuildUpdateMessage overwrites srs->RR_SRV.resrec.rdata->u.srv.port with external (mapped) port number
- rr->NATinfo.IntPort = rr->resrec.rdata->u.srv.port;
- rr->NATinfo.RequestedPort = rr->resrec.rdata->u.srv.port;
- rr->NATinfo.NATLease = 0; // Request default lease
- rr->NATinfo.clientCallback = CompleteRecordNatMap;
- rr->NATinfo.clientContext = rr;
- mDNS_StartNATOperation_internal(m, &rr->NATinfo);
- }
-
-// Unlink an Auth Record from the m->ResourceRecords list.
-// When a resource record enters regState_NoTarget initially, mDNS_Register_internal
-// does not initialize completely e.g., it cannot check for duplicates etc. The resource
-// record is temporarily left in the ResourceRecords list so that we can initialize later
-// when the target is resolvable. Similarly, when host name changes, we enter regState_NoTarget
-// and we do the same.
-
-// This UnlinkResourceRecord routine is very worrying. It bypasses all the normal cleanup performed
-// by mDNS_Deregister_internal and just unceremoniously cuts the record from the active list.
-// This is why re-regsitering this record was producing syslog messages like this:
-// "Error! Tried to add a NAT traversal that's already in the active list"
-// Right now UnlinkResourceRecord is fortunately only called by RegisterAllServiceRecords,
-// which then immediately calls mDNS_Register_internal to re-register the record, which probably
-// masked more serious problems. Any other use of UnlinkResourceRecord is likely to lead to crashes.
-// For now we'll workaround that specific problem by explicitly calling mDNS_StopNATOperation_internal,
-// but long-term we should either stop cancelling the record registration and then re-registering it,
-// or if we really do need to do this for some reason it should be done via the usual
-// mDNS_Deregister_internal path instead of just cutting the record from the list.
-
-mDNSlocal mStatus UnlinkResourceRecord(mDNS *const m, AuthRecord *const rr)
- {
- AuthRecord **list = &m->ResourceRecords;
- while (*list && *list != rr) list = &(*list)->next;
- if (*list)
- {
- *list = rr->next;
- rr->next = mDNSNULL;
-
- // Temporary workaround to cancel any active NAT mapping operation
- if (rr->NATinfo.clientContext)
- {
- mDNS_StopNATOperation_internal(m, &rr->NATinfo);
- rr->NATinfo.clientContext = mDNSNULL;
- if (rr->resrec.rrtype == kDNSType_SRV) rr->resrec.rdata->u.srv.port = rr->NATinfo.IntPort;
- }
-
- return(mStatus_NoError);
- }
- LogMsg("UnlinkResourceRecord:ERROR!! - no such active record %##s", rr->resrec.name->c);
- return(mStatus_NoSuchRecord);
- }
-
-// We need to go through mDNS_Register again as we did not complete the
-// full initialization last time e.g., duplicate checks.
-// After we register, we will be in regState_GetZoneData.
-mDNSlocal void RegisterAllServiceRecords(mDNS *const m, AuthRecord *rr)
- {
- LogInfo("RegisterAllServiceRecords: Service Record %##s", rr->resrec.name->c);
- // First Register the service record, we do this differently from other records because
- // when it entered NoTarget state, it did not go through complete initialization
- rr->SRVChanged = mDNSfalse;
- UnlinkResourceRecord(m, rr);
- mDNS_Register_internal(m, rr);
- // Register the other records
- UpdateAllServiceRecords(m, rr, mDNStrue);
- }
-
-// Called with lock held
-mDNSlocal void UpdateOneSRVRecord(mDNS *m, AuthRecord *rr)
- {
- // Target change if:
- // We have a target and were previously waiting for one, or
- // We had a target and no longer do, or
- // The target has changed
-
- domainname *curtarget = &rr->resrec.rdata->u.srv.target;
- const domainname *const nt = GetServiceTarget(m, rr);
- const domainname *const newtarget = nt ? nt : (domainname*)"";
- mDNSBool TargetChanged = (newtarget->c[0] && rr->state == regState_NoTarget) || !SameDomainName(curtarget, newtarget);
- mDNSBool HaveZoneData = rr->nta && !mDNSIPv4AddressIsZero(rr->nta->Addr.ip.v4);
-
- // Nat state change if:
- // We were behind a NAT, and now we are behind a new NAT, or
- // We're not behind a NAT but our port was previously mapped to a different external port
- // We were not behind a NAT and now we are
-
- mDNSIPPort port = rr->resrec.rdata->u.srv.port;
- mDNSBool NowNeedNATMAP = (rr->AutoTarget == Target_AutoHostAndNATMAP && !mDNSIPPortIsZero(port) && mDNSv4AddrIsRFC1918(&m->AdvertisedV4.ip.v4) && rr->nta && !mDNSAddrIsRFC1918(&rr->nta->Addr));
- mDNSBool WereBehindNAT = (rr->NATinfo.clientContext != mDNSNULL);
- mDNSBool PortWasMapped = (rr->NATinfo.clientContext && !mDNSSameIPPort(rr->NATinfo.RequestedPort, port)); // I think this is always false -- SC Sept 07
- mDNSBool NATChanged = (!WereBehindNAT && NowNeedNATMAP) || (!NowNeedNATMAP && PortWasMapped);
-
- (void)HaveZoneData; //unused
-
- LogInfo("UpdateOneSRVRecord: Resource Record %s TargetChanged %d, NewTarget %##s", ARDisplayString(m, rr), TargetChanged, nt->c);
-
- debugf("UpdateOneSRVRecord: %##s newtarget %##s TargetChanged %d HaveZoneData %d port %d NowNeedNATMAP %d WereBehindNAT %d PortWasMapped %d NATChanged %d",
- rr->resrec.name->c, newtarget,
- TargetChanged, HaveZoneData, mDNSVal16(port), NowNeedNATMAP, WereBehindNAT, PortWasMapped, NATChanged);
-
- if (m->mDNS_busy != m->mDNS_reentrancy+1)
- LogMsg("UpdateOneSRVRecord: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy);
-
- if (!TargetChanged && !NATChanged) return;
-
- // If we are deregistering the record, then ignore any NAT/Target change.
- if (rr->resrec.RecordType == kDNSRecordTypeDeregistering)
- {
- LogInfo("UpdateOneSRVRecord: Deregistering record, Ignoring TargetChanged %d, NATChanged %d for %##s, state %d", TargetChanged, NATChanged,
- rr->resrec.name->c, rr->state);
- return;
- }
-
- if (newtarget)
- LogInfo("UpdateOneSRVRecord: TargetChanged %d, NATChanged %d for %##s, state %d, newtarget %##s", TargetChanged, NATChanged, rr->resrec.name->c, rr->state, newtarget->c);
- else
- LogInfo("UpdateOneSRVRecord: TargetChanged %d, NATChanged %d for %##s, state %d, null newtarget", TargetChanged, NATChanged, rr->resrec.name->c, rr->state);
- switch(rr->state)
- {
- case regState_NATMap:
- // In these states, the SRV has either not yet been registered (it will get up-to-date information when it is)
- // or is in the process of, or has already been, deregistered. This assumes that whenever we transition out
- // of this state, we need to look at the target again.
- return;
-
- case regState_UpdatePending:
- // We are getting a Target change/NAT change while the SRV record is being updated ?
- // let us not do anything for now.
- return;
-
- case regState_NATError:
- if (!NATChanged) return;
- // if nat changed, register if we have a target (below)
-
- case regState_NoTarget:
- if (!newtarget->c[0])
- {
- LogInfo("UpdateOneSRVRecord: No target yet for Resource Record %s", ARDisplayString(m, rr));
- return;
- }
- RegisterAllServiceRecords(m , rr);
- return;
- case regState_DeregPending:
- // We are in DeregPending either because the service was deregistered from above or we handled
- // a NAT/Target change before and sent the deregistration below. There are a few race conditions
- // possible
- //
- // 1. We are handling a second NAT/Target change while the first dereg is in progress. It is possible
- // that first dereg never made it through because there was no network connectivity e.g., disconnecting
- // from network triggers this function due to a target change and later connecting to the network
- // retriggers this function but the deregistration never made it through yet. Just fall through.
- // If there is a target register otherwise deregister.
- //
- // 2. While we sent the dereg during a previous NAT/Target change, uDNS_DeregisterRecord gets
- // called as part of service deregistration. When the response comes back, we call
- // CompleteDeregistration rather than handle NAT/Target change because the record is in
- // kDNSRecordTypeDeregistering state.
- //
- // 3. If the upper layer deregisters the service, we check for kDNSRecordTypeDeregistering both
- // here in this function to avoid handling NAT/Target change and in hndlRecordUpdateReply to call
- // CompleteDeregistration instead of handling NAT/Target change. Hence, we are not concerned
- // about that case here.
- //
- // We just handle case (1) by falling through
- case regState_Pending:
- case regState_Refresh:
- case regState_Registered:
- // target or nat changed. deregister service. upon completion, we'll look for a new target
- rr->SRVChanged = mDNStrue;
- rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL;
- rr->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL;
- if (newtarget->c[0])
- {
- LogInfo("UpdateOneSRVRecord: SRV record changed for service %##s, registering with new target %##s",
- rr->resrec.name->c, newtarget->c);
- rr->state = regState_Pending;
- }
- else
- {
- LogInfo("UpdateOneSRVRecord: SRV record changed for service %##s de-registering", rr->resrec.name->c);
- rr->state = regState_DeregPending;
- UpdateAllServiceRecords(m, rr, mDNSfalse);
- }
- return;
- case regState_Unregistered:
- default: LogMsg("UpdateOneSRVRecord: Unknown state %d for %##s", rr->state, rr->resrec.name->c);
- }
- }
-
-mDNSexport void UpdateAllSRVRecords(mDNS *m)
- {
- m->NextSRVUpdate = 0;
- LogInfo("UpdateAllSRVRecords %d", m->SleepState);
-
- if (m->CurrentRecord)
- LogMsg("UpdateAllSRVRecords ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord));
- m->CurrentRecord = m->ResourceRecords;
- while (m->CurrentRecord)
- {
- AuthRecord *rptr = m->CurrentRecord;
- m->CurrentRecord = m->CurrentRecord->next;
- if (AuthRecord_uDNS(rptr) && rptr->resrec.rrtype == kDNSType_SRV)
- UpdateOneSRVRecord(m, rptr);
- }
- }
-
-// Forward reference: AdvertiseHostname references HostnameCallback, and HostnameCallback calls AdvertiseHostname
-mDNSlocal void HostnameCallback(mDNS *const m, AuthRecord *const rr, mStatus result);
-
-// Called in normal client context (lock not held)
-mDNSlocal void hostnameGetPublicAddressCallback(mDNS *m, NATTraversalInfo *n)
- {
- HostnameInfo *h = (HostnameInfo *)n->clientContext;
-
- if (!h) { LogMsg("RegisterHostnameRecord: registration cancelled"); return; }
-
- if (!n->Result)
- {
- if (mDNSIPv4AddressIsZero(n->ExternalAddress) || mDNSv4AddrIsRFC1918(&n->ExternalAddress)) return;
-
- if (h->arv4.resrec.RecordType)
- {
- if (mDNSSameIPv4Address(h->arv4.resrec.rdata->u.ipv4, n->ExternalAddress)) return; // If address unchanged, do nothing
- LogInfo("Updating hostname %p %##s IPv4 from %.4a to %.4a (NAT gateway's external address)",n,
- h->arv4.resrec.name->c, &h->arv4.resrec.rdata->u.ipv4, &n->ExternalAddress);
- mDNS_Deregister(m, &h->arv4); // mStatus_MemFree callback will re-register with new address
- }
- else
- {
- LogInfo("Advertising hostname %##s IPv4 %.4a (NAT gateway's external address)", h->arv4.resrec.name->c, &n->ExternalAddress);
- h->arv4.resrec.RecordType = kDNSRecordTypeKnownUnique;
- h->arv4.resrec.rdata->u.ipv4 = n->ExternalAddress;
- mDNS_Register(m, &h->arv4);
- }
- }
- }
-
-// register record or begin NAT traversal
-mDNSlocal void AdvertiseHostname(mDNS *m, HostnameInfo *h)
- {
- if (!mDNSIPv4AddressIsZero(m->AdvertisedV4.ip.v4) && h->arv4.resrec.RecordType == kDNSRecordTypeUnregistered)
- {
- mDNS_SetupResourceRecord(&h->arv4, mDNSNULL, mDNSInterface_Any, kDNSType_A, kHostNameTTL, kDNSRecordTypeUnregistered, AuthRecordAny, HostnameCallback, h);
- AssignDomainName(&h->arv4.namestorage, &h->fqdn);
- h->arv4.resrec.rdata->u.ipv4 = m->AdvertisedV4.ip.v4;
- h->arv4.state = regState_Unregistered;
- if (mDNSv4AddrIsRFC1918(&m->AdvertisedV4.ip.v4))
- {
- // If we already have a NAT query active, stop it and restart it to make sure we get another callback
- if (h->natinfo.clientContext) mDNS_StopNATOperation_internal(m, &h->natinfo);
- h->natinfo.Protocol = 0;
- h->natinfo.IntPort = zeroIPPort;
- h->natinfo.RequestedPort = zeroIPPort;
- h->natinfo.NATLease = 0;
- h->natinfo.clientCallback = hostnameGetPublicAddressCallback;
- h->natinfo.clientContext = h;
- mDNS_StartNATOperation_internal(m, &h->natinfo);
- }
- else
- {
- LogInfo("Advertising hostname %##s IPv4 %.4a", h->arv4.resrec.name->c, &m->AdvertisedV4.ip.v4);
- h->arv4.resrec.RecordType = kDNSRecordTypeKnownUnique;
- mDNS_Register_internal(m, &h->arv4);
- }
- }
-
- if (!mDNSIPv6AddressIsZero(m->AdvertisedV6.ip.v6) && h->arv6.resrec.RecordType == kDNSRecordTypeUnregistered)
- {
- mDNS_SetupResourceRecord(&h->arv6, mDNSNULL, mDNSInterface_Any, kDNSType_AAAA, kHostNameTTL, kDNSRecordTypeKnownUnique, AuthRecordAny, HostnameCallback, h);
- AssignDomainName(&h->arv6.namestorage, &h->fqdn);
- h->arv6.resrec.rdata->u.ipv6 = m->AdvertisedV6.ip.v6;
- h->arv6.state = regState_Unregistered;
- LogInfo("Advertising hostname %##s IPv6 %.16a", h->arv6.resrec.name->c, &m->AdvertisedV6.ip.v6);
- mDNS_Register_internal(m, &h->arv6);
- }
- }
-
-mDNSlocal void HostnameCallback(mDNS *const m, AuthRecord *const rr, mStatus result)
- {
- HostnameInfo *hi = (HostnameInfo *)rr->RecordContext;
-
- if (result == mStatus_MemFree)
- {
- if (hi)
- {
- // If we're still in the Hostnames list, update to new address
- HostnameInfo *i;
- LogInfo("HostnameCallback: Got mStatus_MemFree for %p %p %s", hi, rr, ARDisplayString(m, rr));
- for (i = m->Hostnames; i; i = i->next)
- if (rr == &i->arv4 || rr == &i->arv6)
- { mDNS_Lock(m); AdvertiseHostname(m, i); mDNS_Unlock(m); return; }
-
- // Else, we're not still in the Hostnames list, so free the memory
- if (hi->arv4.resrec.RecordType == kDNSRecordTypeUnregistered &&
- hi->arv6.resrec.RecordType == kDNSRecordTypeUnregistered)
- {
- if (hi->natinfo.clientContext) mDNS_StopNATOperation_internal(m, &hi->natinfo);
- hi->natinfo.clientContext = mDNSNULL;
- mDNSPlatformMemFree(hi); // free hi when both v4 and v6 AuthRecs deallocated
- }
- }
- return;
- }
-
- if (result)
- {
- // don't unlink or free - we can retry when we get a new address/router
- if (rr->resrec.rrtype == kDNSType_A)
- LogMsg("HostnameCallback: Error %d for registration of %##s IP %.4a", result, rr->resrec.name->c, &rr->resrec.rdata->u.ipv4);
- else
- LogMsg("HostnameCallback: Error %d for registration of %##s IP %.16a", result, rr->resrec.name->c, &rr->resrec.rdata->u.ipv6);
- if (!hi) { mDNSPlatformMemFree(rr); return; }
- if (rr->state != regState_Unregistered) LogMsg("Error: HostnameCallback invoked with error code for record not in regState_Unregistered!");
-
- if (hi->arv4.state == regState_Unregistered &&
- hi->arv6.state == regState_Unregistered)
- {
- // only deliver status if both v4 and v6 fail
- rr->RecordContext = (void *)hi->StatusContext;
- if (hi->StatusCallback)
- hi->StatusCallback(m, rr, result); // client may NOT make API calls here
- rr->RecordContext = (void *)hi;
- }
- return;
- }
-
- // register any pending services that require a target
- mDNS_Lock(m);
- m->NextSRVUpdate = NonZeroTime(m->timenow);
- mDNS_Unlock(m);
-
- // Deliver success to client
- if (!hi) { LogMsg("HostnameCallback invoked with orphaned address record"); return; }
- if (rr->resrec.rrtype == kDNSType_A)
- LogInfo("Registered hostname %##s IP %.4a", rr->resrec.name->c, &rr->resrec.rdata->u.ipv4);
- else
- LogInfo("Registered hostname %##s IP %.16a", rr->resrec.name->c, &rr->resrec.rdata->u.ipv6);
-
- rr->RecordContext = (void *)hi->StatusContext;
- if (hi->StatusCallback)
- hi->StatusCallback(m, rr, result); // client may NOT make API calls here
- rr->RecordContext = (void *)hi;
- }
-
-mDNSlocal void FoundStaticHostname(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord)
- {
- const domainname *pktname = &answer->rdata->u.name;
- domainname *storedname = &m->StaticHostname;
- HostnameInfo *h = m->Hostnames;
-
- (void)question;
-
- if (answer->rdlength != 0)
- LogInfo("FoundStaticHostname: question %##s -> answer %##s (%s)", question->qname.c, answer->rdata->u.name.c, AddRecord ? "ADD" : "RMV");
- else
- LogInfo("FoundStaticHostname: question %##s -> answer NULL (%s)", question->qname.c, AddRecord ? "ADD" : "RMV");
-
- if (AddRecord && answer->rdlength != 0 && !SameDomainName(pktname, storedname))
- {
- AssignDomainName(storedname, pktname);
- while (h)
- {
- if (h->arv4.state == regState_Pending || h->arv4.state == regState_NATMap || h->arv6.state == regState_Pending)
- {
- // if we're in the process of registering a dynamic hostname, delay SRV update so we don't have to reregister services if the dynamic name succeeds
- m->NextSRVUpdate = NonZeroTime(m->timenow + 5 * mDNSPlatformOneSecond);
- debugf("FoundStaticHostname: NextSRVUpdate in %d %d", m->NextSRVUpdate - m->timenow, m->timenow);
- return;
- }
- h = h->next;
- }
- mDNS_Lock(m);
- m->NextSRVUpdate = NonZeroTime(m->timenow);
- mDNS_Unlock(m);
- }
- else if (!AddRecord && SameDomainName(pktname, storedname))
- {
- mDNS_Lock(m);
- storedname->c[0] = 0;
- m->NextSRVUpdate = NonZeroTime(m->timenow);
- mDNS_Unlock(m);
- }
- }
-
-// Called with lock held
-mDNSlocal void GetStaticHostname(mDNS *m)
- {
- char buf[MAX_REVERSE_MAPPING_NAME_V4];
- DNSQuestion *q = &m->ReverseMap;
- mDNSu8 *ip = m->AdvertisedV4.ip.v4.b;
- mStatus err;
-
- if (m->ReverseMap.ThisQInterval != -1) return; // already running
- if (mDNSIPv4AddressIsZero(m->AdvertisedV4.ip.v4)) return;
-
- mDNSPlatformMemZero(q, sizeof(*q));
- // Note: This is reverse order compared to a normal dotted-decimal IP address, so we can't use our customary "%.4a" format code
- mDNS_snprintf(buf, sizeof(buf), "%d.%d.%d.%d.in-addr.arpa.", ip[3], ip[2], ip[1], ip[0]);
- if (!MakeDomainNameFromDNSNameString(&q->qname, buf)) { LogMsg("Error: GetStaticHostname - bad name %s", buf); return; }
-
- q->InterfaceID = mDNSInterface_Any;
- q->Target = zeroAddr;
- q->qtype = kDNSType_PTR;
- q->qclass = kDNSClass_IN;
- q->LongLived = mDNSfalse;
- q->ExpectUnique = mDNSfalse;
- q->ForceMCast = mDNSfalse;
- q->ReturnIntermed = mDNStrue;
- q->SuppressUnusable = mDNSfalse;
- q->SearchListIndex = 0;
- q->AppendSearchDomains = 0;
- q->RetryWithSearchDomains = mDNSfalse;
- q->TimeoutQuestion = 0;
- q->WakeOnResolve = 0;
- q->qnameOrig = mDNSNULL;
- q->QuestionCallback = FoundStaticHostname;
- q->QuestionContext = mDNSNULL;
-
- LogInfo("GetStaticHostname: %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- err = mDNS_StartQuery_internal(m, q);
- if (err) LogMsg("Error: GetStaticHostname - StartQuery returned error %d", err);
- }
-
-mDNSexport void mDNS_AddDynDNSHostName(mDNS *m, const domainname *fqdn, mDNSRecordCallback *StatusCallback, const void *StatusContext)
- {
- HostnameInfo **ptr = &m->Hostnames;
-
- LogInfo("mDNS_AddDynDNSHostName %##s", fqdn);
-
- while (*ptr && !SameDomainName(fqdn, &(*ptr)->fqdn)) ptr = &(*ptr)->next;
- if (*ptr) { LogMsg("DynDNSHostName %##s already in list", fqdn->c); return; }
-
- // allocate and format new address record
- *ptr = mDNSPlatformMemAllocate(sizeof(**ptr));
- if (!*ptr) { LogMsg("ERROR: mDNS_AddDynDNSHostName - malloc"); return; }
-
- mDNSPlatformMemZero(*ptr, sizeof(**ptr));
- AssignDomainName(&(*ptr)->fqdn, fqdn);
- (*ptr)->arv4.state = regState_Unregistered;
- (*ptr)->arv6.state = regState_Unregistered;
- (*ptr)->StatusCallback = StatusCallback;
- (*ptr)->StatusContext = StatusContext;
-
- AdvertiseHostname(m, *ptr);
- }
-
-mDNSexport void mDNS_RemoveDynDNSHostName(mDNS *m, const domainname *fqdn)
- {
- HostnameInfo **ptr = &m->Hostnames;
-
- LogInfo("mDNS_RemoveDynDNSHostName %##s", fqdn);
-
- while (*ptr && !SameDomainName(fqdn, &(*ptr)->fqdn)) ptr = &(*ptr)->next;
- if (!*ptr) LogMsg("mDNS_RemoveDynDNSHostName: no such domainname %##s", fqdn->c);
- else
- {
- HostnameInfo *hi = *ptr;
- // We do it this way because, if we have no active v6 record, the "mDNS_Deregister_internal(m, &hi->arv4);"
- // below could free the memory, and we have to make sure we don't touch hi fields after that.
- mDNSBool f4 = hi->arv4.resrec.RecordType != kDNSRecordTypeUnregistered && hi->arv4.state != regState_Unregistered;
- mDNSBool f6 = hi->arv6.resrec.RecordType != kDNSRecordTypeUnregistered && hi->arv6.state != regState_Unregistered;
- if (f4) LogInfo("mDNS_RemoveDynDNSHostName removing v4 %##s", fqdn);
- if (f6) LogInfo("mDNS_RemoveDynDNSHostName removing v6 %##s", fqdn);
- *ptr = (*ptr)->next; // unlink
- if (f4) mDNS_Deregister_internal(m, &hi->arv4, mDNS_Dereg_normal);
- if (f6) mDNS_Deregister_internal(m, &hi->arv6, mDNS_Dereg_normal);
- // When both deregistrations complete we'll free the memory in the mStatus_MemFree callback
- }
- if (!m->mDNS_busy) LogMsg("mDNS_RemoveDynDNSHostName: ERROR: Lock not held");
- m->NextSRVUpdate = NonZeroTime(m->timenow);
- }
-
-// Currently called without holding the lock
-// Maybe we should change that?
-mDNSexport void mDNS_SetPrimaryInterfaceInfo(mDNS *m, const mDNSAddr *v4addr, const mDNSAddr *v6addr, const mDNSAddr *router)
- {
- mDNSBool v4Changed, v6Changed, RouterChanged;
-
- if (m->mDNS_busy != m->mDNS_reentrancy)
- LogMsg("mDNS_SetPrimaryInterfaceInfo: mDNS_busy (%ld) != mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy);
-
- if (v4addr && v4addr->type != mDNSAddrType_IPv4) { LogMsg("mDNS_SetPrimaryInterfaceInfo v4 address - incorrect type. Discarding. %#a", v4addr); return; }
- if (v6addr && v6addr->type != mDNSAddrType_IPv6) { LogMsg("mDNS_SetPrimaryInterfaceInfo v6 address - incorrect type. Discarding. %#a", v6addr); return; }
- if (router && router->type != mDNSAddrType_IPv4) { LogMsg("mDNS_SetPrimaryInterfaceInfo passed non-v4 router. Discarding. %#a", router); return; }
-
- mDNS_Lock(m);
-
- v4Changed = !mDNSSameIPv4Address(m->AdvertisedV4.ip.v4, v4addr ? v4addr->ip.v4 : zerov4Addr);
- v6Changed = !mDNSSameIPv6Address(m->AdvertisedV6.ip.v6, v6addr ? v6addr->ip.v6 : zerov6Addr);
- RouterChanged = !mDNSSameIPv4Address(m->Router.ip.v4, router ? router->ip.v4 : zerov4Addr);
-
- if (v4addr && (v4Changed || RouterChanged))
- debugf("mDNS_SetPrimaryInterfaceInfo: address changed from %#a to %#a", &m->AdvertisedV4, v4addr);
-
- if (v4addr) m->AdvertisedV4 = *v4addr; else m->AdvertisedV4.ip.v4 = zerov4Addr;
- if (v6addr) m->AdvertisedV6 = *v6addr; else m->AdvertisedV6.ip.v6 = zerov6Addr;
- if (router) m->Router = *router; else m->Router .ip.v4 = zerov4Addr;
- // setting router to zero indicates that nat mappings must be reestablished when router is reset
-
- if (v4Changed || RouterChanged || v6Changed)
- {
- HostnameInfo *i;
- LogInfo("mDNS_SetPrimaryInterfaceInfo: %s%s%s%#a %#a %#a",
- v4Changed ? "v4Changed " : "",
- RouterChanged ? "RouterChanged " : "",
- v6Changed ? "v6Changed " : "", v4addr, v6addr, router);
-
- for (i = m->Hostnames; i; i = i->next)
- {
- LogInfo("mDNS_SetPrimaryInterfaceInfo updating host name registrations for %##s", i->fqdn.c);
-
- if (i->arv4.resrec.RecordType > kDNSRecordTypeDeregistering &&
- !mDNSSameIPv4Address(i->arv4.resrec.rdata->u.ipv4, m->AdvertisedV4.ip.v4))
- {
- LogInfo("mDNS_SetPrimaryInterfaceInfo deregistering %s", ARDisplayString(m, &i->arv4));
- mDNS_Deregister_internal(m, &i->arv4, mDNS_Dereg_normal);
- }
-
- if (i->arv6.resrec.RecordType > kDNSRecordTypeDeregistering &&
- !mDNSSameIPv6Address(i->arv6.resrec.rdata->u.ipv6, m->AdvertisedV6.ip.v6))
- {
- LogInfo("mDNS_SetPrimaryInterfaceInfo deregistering %s", ARDisplayString(m, &i->arv6));
- mDNS_Deregister_internal(m, &i->arv6, mDNS_Dereg_normal);
- }
-
- // AdvertiseHostname will only register new address records.
- // For records still in the process of deregistering it will ignore them, and let the mStatus_MemFree callback handle them.
- AdvertiseHostname(m, i);
- }
-
- if (v4Changed || RouterChanged)
- {
- // If we have a non-zero IPv4 address, we should try immediately to see if we have a NAT gateway
- // If we have no IPv4 address, we don't want to be in quite such a hurry to report failures to our clients
- // <rdar://problem/6935929> Sleeping server sometimes briefly disappears over Back to My Mac after it wakes up
- m->ExternalAddress = zerov4Addr;
- m->retryIntervalGetAddr = NATMAP_INIT_RETRY;
- m->retryGetAddr = m->timenow + (v4addr ? 0 : mDNSPlatformOneSecond * 5);
- m->NextScheduledNATOp = m->timenow;
- m->LastNATMapResultCode = NATErr_None;
-#ifdef _LEGACY_NAT_TRAVERSAL_
- LNT_ClearState(m);
-#endif // _LEGACY_NAT_TRAVERSAL_
- LogInfo("mDNS_SetPrimaryInterfaceInfo:%s%s: retryGetAddr in %d %d",
- v4Changed ? " v4Changed" : "",
- RouterChanged ? " RouterChanged" : "",
- m->retryGetAddr - m->timenow, m->timenow);
- }
-
- if (m->ReverseMap.ThisQInterval != -1) mDNS_StopQuery_internal(m, &m->ReverseMap);
- m->StaticHostname.c[0] = 0;
-
- m->NextSRVUpdate = NonZeroTime(m->timenow);
-
-#if APPLE_OSX_mDNSResponder
- if (RouterChanged) uuid_generate(m->asl_uuid);
- UpdateAutoTunnelDomainStatuses(m);
-#endif
- }
-
- mDNS_Unlock(m);
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark - Incoming Message Processing
-#endif
-
-mDNSlocal mStatus ParseTSIGError(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *const end, const domainname *const displayname)
- {
- const mDNSu8 *ptr;
- mStatus err = mStatus_NoError;
- int i;
-
- ptr = LocateAdditionals(msg, end);
- if (!ptr) goto finish;
-
- for (i = 0; i < msg->h.numAdditionals; i++)
- {
- ptr = GetLargeResourceRecord(m, msg, ptr, end, 0, kDNSRecordTypePacketAdd, &m->rec);
- if (!ptr) goto finish;
- if (m->rec.r.resrec.RecordType != kDNSRecordTypePacketNegative && m->rec.r.resrec.rrtype == kDNSType_TSIG)
- {
- mDNSu32 macsize;
- mDNSu8 *rd = m->rec.r.resrec.rdata->u.data;
- mDNSu8 *rdend = rd + m->rec.r.resrec.rdlength;
- int alglen = DomainNameLengthLimit(&m->rec.r.resrec.rdata->u.name, rdend);
- if (alglen > MAX_DOMAIN_NAME) goto finish;
- rd += alglen; // algorithm name
- if (rd + 6 > rdend) goto finish;
- rd += 6; // 48-bit timestamp
- if (rd + sizeof(mDNSOpaque16) > rdend) goto finish;
- rd += sizeof(mDNSOpaque16); // fudge
- if (rd + sizeof(mDNSOpaque16) > rdend) goto finish;
- macsize = mDNSVal16(*(mDNSOpaque16 *)rd);
- rd += sizeof(mDNSOpaque16); // MAC size
- if (rd + macsize > rdend) goto finish;
- rd += macsize;
- if (rd + sizeof(mDNSOpaque16) > rdend) goto finish;
- rd += sizeof(mDNSOpaque16); // orig id
- if (rd + sizeof(mDNSOpaque16) > rdend) goto finish;
- err = mDNSVal16(*(mDNSOpaque16 *)rd); // error code
-
- if (err == TSIG_ErrBadSig) { LogMsg("%##s: bad signature", displayname->c); err = mStatus_BadSig; }
- else if (err == TSIG_ErrBadKey) { LogMsg("%##s: bad key", displayname->c); err = mStatus_BadKey; }
- else if (err == TSIG_ErrBadTime) { LogMsg("%##s: bad time", displayname->c); err = mStatus_BadTime; }
- else if (err) { LogMsg("%##s: unknown tsig error %d", displayname->c, err); err = mStatus_UnknownErr; }
- goto finish;
- }
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
- }
-
- finish:
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
- return err;
- }
-
-mDNSlocal mStatus checkUpdateResult(mDNS *const m, const domainname *const displayname, const mDNSu8 rcode, const DNSMessage *const msg, const mDNSu8 *const end)
- {
- (void)msg; // currently unused, needed for TSIG errors
- if (!rcode) return mStatus_NoError;
- else if (rcode == kDNSFlag1_RC_YXDomain)
- {
- debugf("name in use: %##s", displayname->c);
- return mStatus_NameConflict;
- }
- else if (rcode == kDNSFlag1_RC_Refused)
- {
- LogMsg("Update %##s refused", displayname->c);
- return mStatus_Refused;
- }
- else if (rcode == kDNSFlag1_RC_NXRRSet)
- {
- LogMsg("Reregister refused (NXRRSET): %##s", displayname->c);
- return mStatus_NoSuchRecord;
- }
- else if (rcode == kDNSFlag1_RC_NotAuth)
- {
- // TSIG errors should come with FormErr as per RFC 2845, but BIND 9 sends them with NotAuth so we look here too
- mStatus tsigerr = ParseTSIGError(m, msg, end, displayname);
- if (!tsigerr)
- {
- LogMsg("Permission denied (NOAUTH): %##s", displayname->c);
- return mStatus_UnknownErr;
- }
- else return tsigerr;
- }
- else if (rcode == kDNSFlag1_RC_FormErr)
- {
- mStatus tsigerr = ParseTSIGError(m, msg, end, displayname);
- if (!tsigerr)
- {
- LogMsg("Format Error: %##s", displayname->c);
- return mStatus_UnknownErr;
- }
- else return tsigerr;
- }
- else
- {
- LogMsg("Update %##s failed with rcode %d", displayname->c, rcode);
- return mStatus_UnknownErr;
- }
- }
-
-// We add three Additional Records for unicast resource record registrations
-// which is a function of AuthInfo and AutoTunnel properties
-mDNSlocal mDNSu32 RRAdditionalSize(mDNS *const m, DomainAuthInfo *AuthInfo)
- {
- mDNSu32 leaseSize, hinfoSize, tsigSize;
- mDNSu32 rr_base_size = 10; // type (2) class (2) TTL (4) rdlength (2)
-
- // OPT RR : Emptyname(.) + base size + rdataOPT
- leaseSize = 1 + rr_base_size + sizeof(rdataOPT);
-
- // HINFO: Resource Record Name + base size + RDATA
- // HINFO is added only for autotunnels
- hinfoSize = 0;
- if (AuthInfo && AuthInfo->AutoTunnel)
- hinfoSize = (m->hostlabel.c[0] + 1) + DomainNameLength(&AuthInfo->domain) +
- rr_base_size + (2 + m->HIHardware.c[0] + m->HISoftware.c[0]);
-
- //TSIG: Resource Record Name + base size + RDATA
- // RDATA:
- // Algorithm name: hmac-md5.sig-alg.reg.int (8+7+3+3 + 5 bytes for length = 26 bytes)
- // Time: 6 bytes
- // Fudge: 2 bytes
- // Mac Size: 2 bytes
- // Mac: 16 bytes
- // ID: 2 bytes
- // Error: 2 bytes
- // Len: 2 bytes
- // Total: 58 bytes
- tsigSize = 0;
- if (AuthInfo) tsigSize = DomainNameLength(&AuthInfo->keyname) + rr_base_size + 58;
-
- return (leaseSize + hinfoSize + tsigSize);
- }
-
-//Note: Make sure that RREstimatedSize is updated accordingly if anything that is done here
-//would modify rdlength/rdestimate
-mDNSlocal mDNSu8* BuildUpdateMessage(mDNS *const m, mDNSu8 *ptr, AuthRecord *rr, mDNSu8 *limit)
- {
- //If this record is deregistering, then just send the deletion record
- if (rr->state == regState_DeregPending)
- {
- rr->expire = 0; // Indicate that we have no active registration any more
- ptr = putDeletionRecordWithLimit(&m->omsg, ptr, &rr->resrec, limit);
- if (!ptr) goto exit;
- return ptr;
- }
-
- // This is a common function to both sending an update in a group or individual
- // records separately. Hence, we change the state here.
- if (rr->state == regState_Registered) rr->state = regState_Refresh;
- if (rr->state != regState_Refresh && rr->state != regState_UpdatePending)
- rr->state = regState_Pending;
-
- // For Advisory records like e.g., _services._dns-sd, which is shared, don't send goodbyes as multiple
- // host might be registering records and deregistering from one does not make sense
- if (rr->resrec.RecordType != kDNSRecordTypeAdvisory) rr->RequireGoodbye = mDNStrue;
-
- if ((rr->resrec.rrtype == kDNSType_SRV) && (rr->AutoTarget == Target_AutoHostAndNATMAP) &&
- !mDNSIPPortIsZero(rr->NATinfo.ExternalPort))
- {
- rr->resrec.rdata->u.srv.port = rr->NATinfo.ExternalPort;
- }
-
- if (rr->state == regState_UpdatePending)
- {
- // delete old RData
- SetNewRData(&rr->resrec, rr->OrigRData, rr->OrigRDLen);
- if (!(ptr = putDeletionRecordWithLimit(&m->omsg, ptr, &rr->resrec, limit))) goto exit; // delete old rdata
-
- // add new RData
- SetNewRData(&rr->resrec, rr->InFlightRData, rr->InFlightRDLen);
- if (!(ptr = PutResourceRecordTTLWithLimit(&m->omsg, ptr, &m->omsg.h.mDNS_numUpdates, &rr->resrec, rr->resrec.rroriginalttl, limit))) goto exit;
- }
- else
- {
- if (rr->resrec.RecordType == kDNSRecordTypeKnownUnique || rr->resrec.RecordType == kDNSRecordTypeVerified)
- {
- // KnownUnique : Delete any previous value
- // For Unicast registrations, we don't verify that it is unique, but set to verified and hence we want to
- // delete any previous value
- ptr = putDeleteRRSetWithLimit(&m->omsg, ptr, rr->resrec.name, rr->resrec.rrtype, limit);
- if (!ptr) goto exit;
- }
- else if (rr->resrec.RecordType != kDNSRecordTypeShared)
- {
- // For now don't do this, until we have the logic for intelligent grouping of individual records into logical service record sets
- //ptr = putPrereqNameNotInUse(rr->resrec.name, &m->omsg, ptr, end);
- if (!ptr) goto exit;
- }
-
- ptr = PutResourceRecordTTLWithLimit(&m->omsg, ptr, &m->omsg.h.mDNS_numUpdates, &rr->resrec, rr->resrec.rroriginalttl, limit);
- if (!ptr) goto exit;
- }
-
- return ptr;
-exit:
- LogMsg("BuildUpdateMessage: Error formatting message for %s", ARDisplayString(m, rr));
- return mDNSNULL;
- }
-
-// Called with lock held
-mDNSlocal void SendRecordRegistration(mDNS *const m, AuthRecord *rr)
- {
- mDNSu8 *ptr = m->omsg.data;
- mStatus err = mStatus_UnknownErr;
- mDNSu8 *limit;
- DomainAuthInfo *AuthInfo;
-
- // For the ability to register large TXT records, we limit the single record registrations
- // to AbsoluteMaxDNSMessageData
- limit = ptr + AbsoluteMaxDNSMessageData;
-
- AuthInfo = GetAuthInfoForName_internal(m, rr->resrec.name);
- limit -= RRAdditionalSize(m, AuthInfo);
-
- if (m->mDNS_busy != m->mDNS_reentrancy+1)
- LogMsg("SendRecordRegistration: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy);
-
- if (!rr->nta || mDNSIPv4AddressIsZero(rr->nta->Addr.ip.v4))
- {
- // We never call this function when there is no zone information . Log a message if it ever happens.
- LogMsg("SendRecordRegistration: No Zone information, should not happen %s", ARDisplayString(m, rr));
- return;
- }
-
- rr->updateid = mDNS_NewMessageID(m);
- InitializeDNSMessage(&m->omsg.h, rr->updateid, UpdateReqFlags);
-
- // set zone
- ptr = putZone(&m->omsg, ptr, limit, rr->zone, mDNSOpaque16fromIntVal(rr->resrec.rrclass));
- if (!ptr) goto exit;
-
- if (!(ptr = BuildUpdateMessage(m, ptr, rr, limit))) goto exit;
-
- if (rr->uselease)
- {
- ptr = putUpdateLeaseWithLimit(&m->omsg, ptr, DEFAULT_UPDATE_LEASE, limit);
- if (!ptr) goto exit;
- }
- if (rr->Private)
- {
- LogInfo("SendRecordRegistration TCP %p %s", rr->tcp, ARDisplayString(m, rr));
- if (rr->tcp) LogInfo("SendRecordRegistration: Disposing existing TCP connection for %s", ARDisplayString(m, rr));
- if (rr->tcp) { DisposeTCPConn(rr->tcp); rr->tcp = mDNSNULL; }
- if (!rr->nta) { LogMsg("SendRecordRegistration:Private:ERROR!! nta is NULL for %s", ARDisplayString(m, rr)); return; }
- rr->tcp = MakeTCPConn(m, &m->omsg, ptr, kTCPSocketFlags_UseTLS, &rr->nta->Addr, rr->nta->Port, &rr->nta->Host, mDNSNULL, rr);
- }
- else
- {
- LogInfo("SendRecordRegistration UDP %s", ARDisplayString(m, rr));
- if (!rr->nta) { LogMsg("SendRecordRegistration:ERROR!! nta is NULL for %s", ARDisplayString(m, rr)); return; }
- err = mDNSSendDNSMessage(m, &m->omsg, ptr, mDNSInterface_Any, mDNSNULL, &rr->nta->Addr, rr->nta->Port, mDNSNULL, GetAuthInfoForName_internal(m, rr->resrec.name));
- if (err) debugf("ERROR: SendRecordRegistration - mDNSSendDNSMessage - %d", err);
- }
-
- SetRecordRetry(m, rr, 0);
- return;
-exit:
- LogMsg("SendRecordRegistration: Error formatting message for %s, disabling further updates", ARDisplayString(m, rr));
- // Disable this record from future updates
- rr->state = regState_NoTarget;
- }
-
-// Is the given record "rr" eligible for merging ?
-mDNSlocal mDNSBool IsRecordMergeable(mDNS *const m, AuthRecord *rr, mDNSs32 time)
- {
- DomainAuthInfo *info;
- (void) m; //unused
- // A record is eligible for merge, if the following properties are met.
- //
- // 1. uDNS Resource Record
- // 2. It is time to send them now
- // 3. It is in proper state
- // 4. Update zone has been resolved
- // 5. if DomainAuthInfo exists for the zone, it should not be soon deleted
- // 6. Zone information is present
- // 7. Update server is not zero
- // 8. It has a non-null zone
- // 9. It uses a lease option
- // 10. DontMerge is not set
- //
- // Following code is implemented as separate "if" statements instead of one "if" statement
- // is for better debugging purposes e.g., we know exactly what failed if debugging turned on.
-
- if (!AuthRecord_uDNS(rr)) return mDNSfalse;
-
- if (rr->LastAPTime + rr->ThisAPInterval - time > 0)
- { debugf("IsRecordMergeable: Time %d not reached for %s", rr->LastAPTime + rr->ThisAPInterval - m->timenow, ARDisplayString(m, rr)); return mDNSfalse; }
-
- if (!rr->zone) return mDNSfalse;
-
- info = GetAuthInfoForName_internal(m, rr->zone);
-
- if (info && info->deltime && m->timenow - info->deltime >= 0) {debugf("IsRecordMergeable: Domain %##s will be deleted soon", info->domain.c); return mDNSfalse;}
-
- if (rr->state != regState_DeregPending && rr->state != regState_Pending && rr->state != regState_Registered && rr->state != regState_Refresh && rr->state != regState_UpdatePending)
- { debugf("IsRecordMergeable: state %d not right %s", rr->state, ARDisplayString(m, rr)); return mDNSfalse; }
-
- if (!rr->nta || mDNSIPv4AddressIsZero(rr->nta->Addr.ip.v4)) return mDNSfalse;
-
- if (!rr->uselease) return mDNSfalse;
-
- if (rr->mState == mergeState_DontMerge) {debugf("IsRecordMergeable Dontmerge true %s", ARDisplayString(m, rr));return mDNSfalse;}
- debugf("IsRecordMergeable: Returning true for %s", ARDisplayString(m, rr));
- return mDNStrue;
- }
-
-// Is the resource record "rr" eligible to merge to with "currentRR" ?
-mDNSlocal mDNSBool AreRecordsMergeable(mDNS *const m, AuthRecord *currentRR, AuthRecord *rr, mDNSs32 time)
- {
- // A record is eligible to merge with another record as long it is eligible for merge in itself
- // and it has the same zone information as the other record
- if (!IsRecordMergeable(m, rr, time)) return mDNSfalse;
-
- if (!SameDomainName(currentRR->zone, rr->zone))
- { debugf("AreRecordMergeable zone mismatch current rr Zone %##s, rr zone %##s", currentRR->zone->c, rr->zone->c); return mDNSfalse; }
-
- if (!mDNSSameIPv4Address(currentRR->nta->Addr.ip.v4, rr->nta->Addr.ip.v4)) return mDNSfalse;
-
- if (!mDNSSameIPPort(currentRR->nta->Port, rr->nta->Port)) return mDNSfalse;
-
- debugf("AreRecordsMergeable: Returning true for %s", ARDisplayString(m, rr));
- return mDNStrue;
- }
-
-// If we can't build the message successfully because of problems in pre-computing
-// the space, we disable merging for all the current records
-mDNSlocal void RRMergeFailure(mDNS *const m)
- {
- AuthRecord *rr;
- for (rr = m->ResourceRecords; rr; rr = rr->next)
- {
- rr->mState = mergeState_DontMerge;
- rr->SendRNow = mDNSNULL;
- // Restarting the registration is much simpler than saving and restoring
- // the exact time
- ActivateUnicastRegistration(m, rr);
- }
- }
-
-mDNSlocal void SendGroupRRMessage(mDNS *const m, AuthRecord *anchorRR, mDNSu8 *ptr, DomainAuthInfo *info)
- {
- mDNSu8 *limit;
- if (!anchorRR) {debugf("SendGroupRRMessage: Could not merge records"); return;}
-
- if (info && info->AutoTunnel) limit = m->omsg.data + AbsoluteMaxDNSMessageData;
- else limit = m->omsg.data + NormalMaxDNSMessageData;
-
- // This has to go in the additional section and hence need to be done last
- ptr = putUpdateLeaseWithLimit(&m->omsg, ptr, DEFAULT_UPDATE_LEASE, limit);
- if (!ptr)
- {
- LogMsg("SendGroupRRMessage: ERROR: Could not put lease option, failing the group registration");
- // if we can't put the lease, we need to undo the merge
- RRMergeFailure(m);
- return;
- }
- if (anchorRR->Private)
- {
- if (anchorRR->tcp) debugf("SendGroupRRMessage: Disposing existing TCP connection for %s", ARDisplayString(m, anchorRR));
- if (anchorRR->tcp) { DisposeTCPConn(anchorRR->tcp); anchorRR->tcp = mDNSNULL; }
- if (!anchorRR->nta) { LogMsg("SendGroupRRMessage:ERROR!! nta is NULL for %s", ARDisplayString(m, anchorRR)); return; }
- anchorRR->tcp = MakeTCPConn(m, &m->omsg, ptr, kTCPSocketFlags_UseTLS, &anchorRR->nta->Addr, anchorRR->nta->Port, &anchorRR->nta->Host, mDNSNULL, anchorRR);
- if (!anchorRR->tcp) LogInfo("SendGroupRRMessage: Cannot establish TCP connection for %s", ARDisplayString(m, anchorRR));
- else LogInfo("SendGroupRRMessage: Sent a group update ID: %d start %p, end %p, limit %p", mDNSVal16(m->omsg.h.id), m->omsg.data, ptr, limit);
- }
- else
- {
- mStatus err = mDNSSendDNSMessage(m, &m->omsg, ptr, mDNSInterface_Any, mDNSNULL, &anchorRR->nta->Addr, anchorRR->nta->Port, mDNSNULL, info);
- if (err) LogInfo("SendGroupRRMessage: Cannot send UDP message for %s", ARDisplayString(m, anchorRR));
- else LogInfo("SendGroupRRMessage: Sent a group UDP update ID: %d start %p, end %p, limit %p", mDNSVal16(m->omsg.h.id), m->omsg.data, ptr, limit);
- }
- return;
- }
-
-// As we always include the zone information and the resource records contain zone name
-// at the end, it will get compressed. Hence, we subtract zoneSize and add two bytes for
-// the compression pointer
-mDNSlocal mDNSu32 RREstimatedSize(AuthRecord *rr, int zoneSize)
- {
- int rdlength;
-
- // Note: Estimation of the record size has to mirror the logic in BuildUpdateMessage, otherwise estimation
- // would be wrong. Currently BuildUpdateMessage calls SetNewRData in UpdatePending case. Hence, we need
- // to account for that here. Otherwise, we might under estimate the size.
- if (rr->state == regState_UpdatePending)
- // old RData that will be deleted
- // new RData that will be added
- rdlength = rr->OrigRDLen + rr->InFlightRDLen;
- else
- rdlength = rr->resrec.rdestimate;
-
- if (rr->state == regState_DeregPending)
- {
- debugf("RREstimatedSize: ResourceRecord %##s (%s), DomainNameLength %d, zoneSize %d, rdestimate %d",
- rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype), DomainNameLength(rr->resrec.name), zoneSize, rdlength);
- return DomainNameLength(rr->resrec.name) - zoneSize + 2 + 10 + rdlength;
- }
-
- // For SRV, TXT, AAAA etc. that are Unique/Verified, we also send a Deletion Record
- if (rr->resrec.RecordType == kDNSRecordTypeKnownUnique || rr->resrec.RecordType == kDNSRecordTypeVerified)
- {
- // Deletion Record: Resource Record Name + Base size (10) + 0
- // Record: Resource Record Name (Compressed = 2) + Base size (10) + rdestimate
-
- debugf("RREstimatedSize: ResourceRecord %##s (%s), DomainNameLength %d, zoneSize %d, rdestimate %d",
- rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype), DomainNameLength(rr->resrec.name), zoneSize, rdlength);
- return DomainNameLength(rr->resrec.name) - zoneSize + 2 + 10 + 2 + 10 + rdlength;
- }
- else
- {
- return DomainNameLength(rr->resrec.name) - zoneSize + 2 + 10 + rdlength;
- }
- }
-
-mDNSlocal AuthRecord *MarkRRForSending(mDNS *const m)
- {
- AuthRecord *rr;
- AuthRecord *firstRR = mDNSNULL;
-
- // Look for records that needs to be sent in the next two seconds (MERGE_DELAY_TIME is set to 1 second).
- // The logic is as follows.
- //
- // 1. Record 1 finishes getting zone data and its registration gets delayed by 1 second
- // 2. Record 2 comes 0.1 second later, finishes getting its zone data and its registration is also delayed by
- // 1 second which is now scheduled at 1.1 second
- //
- // By looking for 1 second into the future (m->timenow + MERGE_DELAY_TIME below does that) we have merged both
- // of the above records. Note that we can't look for records too much into the future as this will affect the
- // retry logic. The first retry is scheduled at 3 seconds. Hence, we should always look smaller than that.
- // Anything more than one second will affect the first retry to happen sooner.
- //
- // Note: As a side effect of looking one second into the future to facilitate merging, the retries happen
- // one second sooner.
- for (rr = m->ResourceRecords; rr; rr = rr->next)
- {
- if (!firstRR)
- {
- if (!IsRecordMergeable(m, rr, m->timenow + MERGE_DELAY_TIME)) continue;
- firstRR = rr;
- }
- else if (!AreRecordsMergeable(m, firstRR, rr, m->timenow + MERGE_DELAY_TIME)) continue;
-
- if (rr->SendRNow) LogMsg("MarkRRForSending: Resourcerecord %s already marked for sending", ARDisplayString(m, rr));
- rr->SendRNow = mDNSInterfaceMark;
- }
-
- // We parsed through all records and found something to send. The services/records might
- // get registered at different times but we want the refreshes to be all merged and sent
- // as one update. Hence, we accelerate some of the records so that they will sync up in
- // the future. Look at the records excluding the ones that we have already sent in the
- // previous pass. If it half way through its scheduled refresh/retransmit, merge them
- // into this packet.
- //
- // Note that we only look at Registered/Refresh state to keep it simple. As we don't know
- // whether the current update will fit into one or more packets, merging a resource record
- // (which is in a different state) that has been scheduled for retransmit would trigger
- // sending more packets.
- if (firstRR)
- {
- int acc = 0;
- for (rr = m->ResourceRecords; rr; rr = rr->next)
- {
- if ((rr->state != regState_Registered && rr->state != regState_Refresh) ||
- (rr->SendRNow == mDNSInterfaceMark) ||
- (!AreRecordsMergeable(m, firstRR, rr, m->timenow + rr->ThisAPInterval/2)))
- continue;
- rr->SendRNow = mDNSInterfaceMark;
- acc++;
- }
- if (acc) LogInfo("MarkRRForSending: Accelereated %d records", acc);
- }
- return firstRR;
- }
-
-mDNSlocal mDNSBool SendGroupUpdates(mDNS *const m)
- {
- mDNSOpaque16 msgid;
- mDNSs32 spaceleft = 0;
- mDNSs32 zoneSize, rrSize;
- mDNSu8 *oldnext; // for debugging
- mDNSu8 *next = m->omsg.data;
- AuthRecord *rr;
- AuthRecord *anchorRR = mDNSNULL;
- int nrecords = 0;
- AuthRecord *startRR = m->ResourceRecords;
- mDNSu8 *limit = mDNSNULL;
- DomainAuthInfo *AuthInfo = mDNSNULL;
- mDNSBool sentallRecords = mDNStrue;
-
-
- // We try to fit as many ResourceRecords as possible in AbsoluteNormal/MaxDNSMessageData. Before we start
- // putting in resource records, we need to reserve space for a few things. Every group/packet should
- // have the following.
- //
- // 1) Needs space for the Zone information (which needs to be at the beginning)
- // 2) Additional section MUST have space for lease option, HINFO and TSIG option (which needs to
- // to be at the end)
- //
- // In future we need to reserve space for the pre-requisites which also goes at the beginning.
- // To accomodate pre-requisites in the future, first we walk the whole list marking records
- // that can be sent in this packet and computing the space needed for these records.
- // For TXT and SRV records, we delete the previous record if any by sending the same
- // resource record with ANY RDATA and zero rdlen. Hence, we need to have space for both of them.
-
- while (startRR)
- {
- AuthInfo = mDNSNULL;
- anchorRR = mDNSNULL;
- nrecords = 0;
- zoneSize = 0;
- for (rr = startRR; rr; rr = rr->next)
- {
- if (rr->SendRNow != mDNSInterfaceMark) continue;
-
- rr->SendRNow = mDNSNULL;
-
- if (!anchorRR)
- {
- AuthInfo = GetAuthInfoForName_internal(m, rr->zone);
-
- // Though we allow single record registrations for UDP to be AbsoluteMaxDNSMessageData (See
- // SendRecordRegistration) to handle large TXT records, to avoid fragmentation we limit UDP
- // message to NormalMaxDNSMessageData
- if (AuthInfo && AuthInfo->AutoTunnel) spaceleft = AbsoluteMaxDNSMessageData;
- else spaceleft = NormalMaxDNSMessageData;
-
- next = m->omsg.data;
- spaceleft -= RRAdditionalSize(m, AuthInfo);
- if (spaceleft <= 0)
- {
- LogMsg("SendGroupUpdates: ERROR!!: spaceleft is zero at the beginning");
- RRMergeFailure(m);
- return mDNSfalse;
- }
- limit = next + spaceleft;
-
- // Build the initial part of message before putting in the other records
- msgid = mDNS_NewMessageID(m);
- InitializeDNSMessage(&m->omsg.h, msgid, UpdateReqFlags);
-
- // We need zone information at the beginning of the packet. Length: ZNAME, ZTYPE(2), ZCLASS(2)
- // zone has to be non-NULL for a record to be mergeable, hence it is safe to set/ examine zone
- //without checking for NULL.
- zoneSize = DomainNameLength(rr->zone) + 4;
- spaceleft -= zoneSize;
- if (spaceleft <= 0)
- {
- LogMsg("SendGroupUpdates: ERROR no space for zone information, disabling merge");
- RRMergeFailure(m);
- return mDNSfalse;
- }
- next = putZone(&m->omsg, next, limit, rr->zone, mDNSOpaque16fromIntVal(rr->resrec.rrclass));
- if (!next)
- {
- LogMsg("SendGroupUpdates: ERROR! Cannot put zone, disabling merge");
- RRMergeFailure(m);
- return mDNSfalse;
- }
- anchorRR = rr;
- }
-
- rrSize = RREstimatedSize(rr, zoneSize - 4);
-
- if ((spaceleft - rrSize) < 0)
- {
- // If we can't fit even a single message, skip it, it will be sent separately
- // in CheckRecordUpdates
- if (!nrecords)
- {
- LogInfo("SendGroupUpdates: Skipping message %s, spaceleft %d, rrSize %d", ARDisplayString(m, rr), spaceleft, rrSize);
- // Mark this as not sent so that the caller knows about it
- rr->SendRNow = mDNSInterfaceMark;
- // We need to remove the merge delay so that we can send it immediately
- rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL;
- rr->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL;
- rr = rr->next;
- anchorRR = mDNSNULL;
- sentallRecords = mDNSfalse;
- }
- else
- {
- LogInfo("SendGroupUpdates:1: Parsed %d records and sending using %s, spaceleft %d, rrSize %d", nrecords, ARDisplayString(m, anchorRR), spaceleft, rrSize);
- SendGroupRRMessage(m, anchorRR, next, AuthInfo);
- }
- break; // breaks out of for loop
- }
- spaceleft -= rrSize;
- oldnext = next;
- LogInfo("SendGroupUpdates: Building a message with resource record %s, next %p, state %d, ttl %d", ARDisplayString(m, rr), next, rr->state, rr->resrec.rroriginalttl);
- if (!(next = BuildUpdateMessage(m, next, rr, limit)))
- {
- // We calculated the space and if we can't fit in, we had some bug in the calculation,
- // disable merge completely.
- LogMsg("SendGroupUpdates: ptr NULL while building message with %s", ARDisplayString(m, rr));
- RRMergeFailure(m);
- return mDNSfalse;
- }
- // If our estimate was higher, adjust to the actual size
- if ((next - oldnext) > rrSize)
- LogMsg("SendGroupUpdates: ERROR!! Record size estimation is wrong for %s, Estimate %d, Actual %d, state %d", ARDisplayString(m, rr), rrSize, next - oldnext, rr->state);
- else { spaceleft += rrSize; spaceleft -= (next - oldnext); }
-
- nrecords++;
- // We could have sent an update earlier with this "rr" as anchorRR for which we never got a response.
- // To preserve ordering, we blow away the previous connection before sending this.
- if (rr->tcp) { DisposeTCPConn(rr->tcp); rr->tcp = mDNSNULL;}
- rr->updateid = msgid;
-
- // By setting the retry time interval here, we will not be looking at these records
- // again when we return to CheckGroupRecordUpdates.
- SetRecordRetry(m, rr, 0);
- }
- // Either we have parsed all the records or stopped at "rr" above due to lack of space
- startRR = rr;
- }
-
- if (anchorRR)
- {
- LogInfo("SendGroupUpdates: Parsed %d records and sending using %s", nrecords, ARDisplayString(m, anchorRR));
- SendGroupRRMessage(m, anchorRR, next, AuthInfo);
- }
- return sentallRecords;
- }
-
-// Merge the record registrations and send them as a group only if they
-// have same DomainAuthInfo and hence the same key to put the TSIG
-mDNSlocal void CheckGroupRecordUpdates(mDNS *const m)
- {
- AuthRecord *rr, *nextRR;
- // Keep sending as long as there is at least one record to be sent
- while (MarkRRForSending(m))
- {
- if (!SendGroupUpdates(m))
- {
- // if everything that was marked was not sent, send them out individually
- for (rr = m->ResourceRecords; rr; rr = nextRR)
- {
- // SendRecordRegistrtion might delete the rr from list, hence
- // dereference nextRR before calling the function
- nextRR = rr->next;
- if (rr->SendRNow == mDNSInterfaceMark)
- {
- // Any records marked for sending should be eligible to be sent out
- // immediately. Just being cautious
- if (rr->LastAPTime + rr->ThisAPInterval - m->timenow > 0)
- { LogMsg("CheckGroupRecordUpdates: ERROR!! Resourcerecord %s not ready", ARDisplayString(m, rr)); continue; }
- rr->SendRNow = mDNSNULL;
- SendRecordRegistration(m, rr);
- }
- }
- }
- }
-
- debugf("CheckGroupRecordUpdates: No work, returning");
- return;
- }
-
-mDNSlocal void hndlSRVChanged(mDNS *const m, AuthRecord *rr)
- {
- // Reevaluate the target always as NAT/Target could have changed while
- // we were registering/deeregistering
- domainname *dt;
- const domainname *target = GetServiceTarget(m, rr);
- if (!target || target->c[0] == 0)
- {
- // we don't have a target, if we just derregistered, then we don't have to do anything
- if (rr->state == regState_DeregPending)
- {
- LogInfo("hndlSRVChanged: SRVChanged, No Target, SRV Deregistered for %##s, state %d", rr->resrec.name->c,
- rr->state);
- rr->SRVChanged = mDNSfalse;
- dt = GetRRDomainNameTarget(&rr->resrec);
- if (dt) dt->c[0] = 0;
- rr->state = regState_NoTarget; // Wait for the next target change
- rr->resrec.rdlength = rr->resrec.rdestimate = 0;
- return;
- }
-
- // we don't have a target, if we just registered, we need to deregister
- if (rr->state == regState_Pending)
- {
- LogInfo("hndlSRVChanged: SRVChanged, No Target, Deregistering again %##s, state %d", rr->resrec.name->c, rr->state);
- rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL;
- rr->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL;
- rr->state = regState_DeregPending;
- return;
- }
- LogInfo("hndlSRVChanged: Not in DeregPending or RegPending state %##s, state %d", rr->resrec.name->c, rr->state);
- }
- else
- {
- // If we were in registered state and SRV changed to NULL, we deregister and come back here
- // if we have a target, we need to register again.
- //
- // if we just registered check to see if it is same. If it is different just re-register the
- // SRV and its assoicated records
- //
- // UpdateOneSRVRecord takes care of re-registering all service records
- if ((rr->state == regState_DeregPending) ||
- (rr->state == regState_Pending && !SameDomainName(target, &rr->resrec.rdata->u.srv.target)))
- {
- dt = GetRRDomainNameTarget(&rr->resrec);
- if (dt) dt->c[0] = 0;
- rr->state = regState_NoTarget; // NoTarget will allow us to pick up new target OR nat traversal state
- rr->resrec.rdlength = rr->resrec.rdestimate = 0;
- LogInfo("hndlSRVChanged: SRVChanged, Valid Target %##s, Registering all records for %##s, state %d",
- target->c, rr->resrec.name->c, rr->state);
- rr->SRVChanged = mDNSfalse;
- UpdateOneSRVRecord(m, rr);
- return;
- }
- // Target did not change while this record was registering. Hence, we go to
- // Registered state - the state we started from.
- if (rr->state == regState_Pending) rr->state = regState_Registered;
- }
-
- rr->SRVChanged = mDNSfalse;
- }
-
-// Called with lock held
-mDNSlocal void hndlRecordUpdateReply(mDNS *m, AuthRecord *rr, mStatus err, mDNSu32 random)
- {
- mDNSBool InvokeCallback = mDNStrue;
- mDNSIPPort UpdatePort = zeroIPPort;
-
- if (m->mDNS_busy != m->mDNS_reentrancy+1)
- LogMsg("hndlRecordUpdateReply: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy);
-
- LogInfo("hndlRecordUpdateReply: err %d ID %d state %d %s(%p)", err, mDNSVal16(rr->updateid), rr->state, ARDisplayString(m, rr), rr);
-
- rr->updateError = err;
-#if APPLE_OSX_mDNSResponder
- if (err == mStatus_BadSig) UpdateAutoTunnelDomainStatuses(m);
-#endif
-
- SetRecordRetry(m, rr, random);
-
- rr->updateid = zeroID; // Make sure that this is not considered as part of a group anymore
- // Later when need to send an update, we will get the zone data again. Thus we avoid
- // using stale information.
- //
- // Note: By clearing out the zone info here, it also helps better merging of records
- // in some cases. For example, when we get out regState_NoTarget state e.g., move out
- // of Double NAT, we want all the records to be in one update. Some BTMM records like
- // _autotunnel6 and host records are registered/deregistered when NAT state changes.
- // As they are re-registered the zone information is cleared out. To merge with other
- // records that might be possibly going out, clearing out the information here helps
- // as all of them try to get the zone data.
- if (rr->nta)
- {
- // We always expect the question to be stopped when we get a valid response from the server.
- // If the zone info tries to change during this time, updateid would be different and hence
- // this response should not have been accepted.
- if (rr->nta->question.ThisQInterval != -1)
- LogMsg("hndlRecordUpdateReply: ResourceRecord %s, zone info question %##s (%s) interval %d not -1",
- ARDisplayString(m, rr), rr->nta->question.qname.c, DNSTypeName(rr->nta->question.qtype), rr->nta->question.ThisQInterval);
- UpdatePort = rr->nta->Port;
- CancelGetZoneData(m, rr->nta);
- rr->nta = mDNSNULL;
- }
-
- // If we are deregistering the record, then complete the deregistration. Ignore any NAT/SRV change
- // that could have happened during that time.
- if (rr->resrec.RecordType == kDNSRecordTypeDeregistering && rr->state == regState_DeregPending)
- {
- debugf("hndlRecordUpdateReply: Received reply for deregister record %##s type %d", rr->resrec.name->c, rr->resrec.rrtype);
- if (err) LogMsg("ERROR: Deregistration of record %##s type %d failed with error %d",
- rr->resrec.name->c, rr->resrec.rrtype, err);
- rr->state = regState_Unregistered;
- CompleteDeregistration(m, rr);
- return;
- }
-
- // We are returning early without updating the state. When we come back from sleep we will re-register after
- // re-initializing all the state as though it is a first registration. If the record can't be registered e.g.,
- // no target, it will be deregistered. Hence, the updating to the right state should not matter when going
- // to sleep.
- if (m->SleepState)
- {
- // Need to set it to NoTarget state so that RecordReadyForSleep knows that
- // we are done
- if (rr->resrec.rrtype == kDNSType_SRV && rr->state == regState_DeregPending)
- rr->state = regState_NoTarget;
- return;
- }
-
- if (rr->state == regState_UpdatePending)
- {
- if (err) LogMsg("Update record failed for %##s (err %d)", rr->resrec.name->c, err);
- rr->state = regState_Registered;
- // deallocate old RData
- if (rr->UpdateCallback) rr->UpdateCallback(m, rr, rr->OrigRData, rr->OrigRDLen);
- SetNewRData(&rr->resrec, rr->InFlightRData, rr->InFlightRDLen);
- rr->OrigRData = mDNSNULL;
- rr->InFlightRData = mDNSNULL;
- }
-
- if (rr->SRVChanged)
- {
- if (rr->resrec.rrtype == kDNSType_SRV)
- hndlSRVChanged(m, rr);
- else
- {
- LogInfo("hndlRecordUpdateReply: Deregistered %##s (%s), state %d", rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype), rr->state);
- rr->SRVChanged = mDNSfalse;
- if (rr->state != regState_DeregPending) LogMsg("hndlRecordUpdateReply: ResourceRecord %s not in DeregPending state %d", ARDisplayString(m, rr), rr->state);
- rr->state = regState_NoTarget; // Wait for the next target change
- }
- return;
- }
-
- if (rr->state == regState_Pending || rr->state == regState_Refresh)
- {
- if (!err)
- {
- if (rr->state == regState_Refresh) InvokeCallback = mDNSfalse;
- rr->state = regState_Registered;
- }
- else
- {
- // Retry without lease only for non-Private domains
- LogMsg("hndlRecordUpdateReply: Registration of record %##s type %d failed with error %d", rr->resrec.name->c, rr->resrec.rrtype, err);
- if (!rr->Private && rr->uselease && err == mStatus_UnknownErr && mDNSSameIPPort(UpdatePort, UnicastDNSPort))
- {
- LogMsg("hndlRecordUpdateReply: Will retry update of record %##s without lease option", rr->resrec.name->c);
- rr->uselease = mDNSfalse;
- rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL;
- rr->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL;
- return;
- }
- // Communicate the error to the application in the callback below
- }
- }
-
- if (rr->QueuedRData && rr->state == regState_Registered)
- {
- rr->state = regState_UpdatePending;
- rr->InFlightRData = rr->QueuedRData;
- rr->InFlightRDLen = rr->QueuedRDLen;
- rr->OrigRData = rr->resrec.rdata;
- rr->OrigRDLen = rr->resrec.rdlength;
- rr->QueuedRData = mDNSNULL;
- rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL;
- rr->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL;
- return;
- }
-
- // Don't invoke the callback on error as this may not be useful to the client.
- // The client may potentially delete the resource record on error which we normally
- // delete during deregistration
- if (!err && InvokeCallback && rr->RecordCallback)
- {
- LogInfo("hndlRecordUpdateReply: Calling record callback on %##s", rr->resrec.name->c);
- mDNS_DropLockBeforeCallback();
- rr->RecordCallback(m, rr, err);
- mDNS_ReclaimLockAfterCallback();
- }
- // CAUTION: MUST NOT do anything more with rr after calling rr->Callback(), because the client's callback function
- // is allowed to do anything, including starting/stopping queries, registering/deregistering records, etc.
- }
-
-mDNSexport void uDNS_ReceiveNATPMPPacket(mDNS *m, const mDNSInterfaceID InterfaceID, mDNSu8 *pkt, mDNSu16 len)
- {
- NATTraversalInfo *ptr;
- NATAddrReply *AddrReply = (NATAddrReply *)pkt;
- NATPortMapReply *PortMapReply = (NATPortMapReply *)pkt;
- mDNSu32 nat_elapsed, our_elapsed;
-
- // Minimum packet is vers (1) opcode (1) err (2) upseconds (4) = 8 bytes
- if (!AddrReply->err && len < 8) { LogMsg("NAT Traversal message too short (%d bytes)", len); return; }
- if (AddrReply->vers != NATMAP_VERS) { LogMsg("Received NAT Traversal response with version %d (expected %d)", pkt[0], NATMAP_VERS); return; }
-
- // Read multi-byte numeric values (fields are identical in a NATPortMapReply)
- AddrReply->err = (mDNSu16) ( (mDNSu16)pkt[2] << 8 | pkt[3]);
- AddrReply->upseconds = (mDNSs32) ((mDNSs32)pkt[4] << 24 | (mDNSs32)pkt[5] << 16 | (mDNSs32)pkt[6] << 8 | pkt[7]);
-
- nat_elapsed = AddrReply->upseconds - m->LastNATupseconds;
- our_elapsed = (m->timenow - m->LastNATReplyLocalTime) / mDNSPlatformOneSecond;
- debugf("uDNS_ReceiveNATPMPPacket %X upseconds %u nat_elapsed %d our_elapsed %d", AddrReply->opcode, AddrReply->upseconds, nat_elapsed, our_elapsed);
-
- // We compute a conservative estimate of how much the NAT gateways's clock should have advanced
- // 1. We subtract 12.5% from our own measured elapsed time, to allow for NAT gateways that have an inacurate clock that runs slowly
- // 2. We add a two-second safety margin to allow for rounding errors: e.g.
- // -- if NAT gateway sends a packet at t=2.000 seconds, then one at t=7.999, that's approximately 6 real seconds,
- // but based on the values in the packet (2,7) the apparent difference according to the packet is only 5 seconds
- // -- if we're slow handling packets and/or we have coarse clock granularity,
- // we could receive the t=2 packet at our t=1.999 seconds, which we round down to 1
- // and the t=7.999 packet at our t=8.000 seconds, which we record as 8,
- // giving an apparent local time difference of 7 seconds
- // The two-second safety margin coves this possible calculation discrepancy
- if (AddrReply->upseconds < m->LastNATupseconds || nat_elapsed + 2 < our_elapsed - our_elapsed/8)
- { LogMsg("NAT gateway %#a rebooted", &m->Router); RecreateNATMappings(m); }
-
- m->LastNATupseconds = AddrReply->upseconds;
- m->LastNATReplyLocalTime = m->timenow;
-#ifdef _LEGACY_NAT_TRAVERSAL_
- LNT_ClearState(m);
-#endif // _LEGACY_NAT_TRAVERSAL_
-
- if (AddrReply->opcode == NATOp_AddrResponse)
- {
-#if APPLE_OSX_mDNSResponder
- static char msgbuf[16];
- mDNS_snprintf(msgbuf, sizeof(msgbuf), "%d", AddrReply->err);
- mDNSASLLog((uuid_t *)&m->asl_uuid, "natt.natpmp.AddressRequest", AddrReply->err ? "failure" : "success", msgbuf, "");
-#endif
- if (!AddrReply->err && len < sizeof(NATAddrReply)) { LogMsg("NAT Traversal AddrResponse message too short (%d bytes)", len); return; }
- natTraversalHandleAddressReply(m, AddrReply->err, AddrReply->ExtAddr);
- }
- else if (AddrReply->opcode == NATOp_MapUDPResponse || AddrReply->opcode == NATOp_MapTCPResponse)
- {
- mDNSu8 Protocol = AddrReply->opcode & 0x7F;
-#if APPLE_OSX_mDNSResponder
- static char msgbuf[16];
- mDNS_snprintf(msgbuf, sizeof(msgbuf), "%s - %d", AddrReply->opcode == NATOp_MapUDPResponse ? "UDP" : "TCP", PortMapReply->err);
- mDNSASLLog((uuid_t *)&m->asl_uuid, "natt.natpmp.PortMapRequest", PortMapReply->err ? "failure" : "success", msgbuf, "");
-#endif
- if (!PortMapReply->err)
- {
- if (len < sizeof(NATPortMapReply)) { LogMsg("NAT Traversal PortMapReply message too short (%d bytes)", len); return; }
- PortMapReply->NATRep_lease = (mDNSu32) ((mDNSu32)pkt[12] << 24 | (mDNSu32)pkt[13] << 16 | (mDNSu32)pkt[14] << 8 | pkt[15]);
- }
-
- // Since some NAT-PMP server implementations don't return the requested internal port in
- // the reply, we can't associate this reply with a particular NATTraversalInfo structure.
- // We globally keep track of the most recent error code for mappings.
- m->LastNATMapResultCode = PortMapReply->err;
-
- for (ptr = m->NATTraversals; ptr; ptr=ptr->next)
- if (ptr->Protocol == Protocol && mDNSSameIPPort(ptr->IntPort, PortMapReply->intport))
- natTraversalHandlePortMapReply(m, ptr, InterfaceID, PortMapReply->err, PortMapReply->extport, PortMapReply->NATRep_lease);
- }
- else { LogMsg("Received NAT Traversal response with version unknown opcode 0x%X", AddrReply->opcode); return; }
-
- // Don't need an SSDP socket if we get a NAT-PMP packet
- if (m->SSDPSocket) { debugf("uDNS_ReceiveNATPMPPacket destroying SSDPSocket %p", &m->SSDPSocket); mDNSPlatformUDPClose(m->SSDPSocket); m->SSDPSocket = mDNSNULL; }
- }
-
-// <rdar://problem/3925163> Shorten DNS-SD queries to avoid NAT bugs
-// <rdar://problem/4288449> Add check to avoid crashing NAT gateways that have buggy DNS relay code
-//
-// We know of bugs in home NAT gateways that cause them to crash if they receive certain DNS queries.
-// The DNS queries that make them crash are perfectly legal DNS queries, but even if they weren't,
-// the gateway shouldn't crash -- in today's world of viruses and network attacks, software has to
-// be written assuming that a malicious attacker could send them any packet, properly-formed or not.
-// Still, we don't want to be crashing people's home gateways, so we go out of our way to avoid
-// the queries that crash them.
-//
-// Some examples:
-//
-// 1. Any query where the name ends in ".in-addr.arpa." and the text before this is 32 or more bytes.
-// The query type does not need to be PTR -- the gateway will crash for any query type.
-// e.g. "ping long-name-crashes-the-buggy-router.in-addr.arpa" will crash one of these.
-//
-// 2. Any query that results in a large response with the TC bit set.
-//
-// 3. Any PTR query that doesn't begin with four decimal numbers.
-// These gateways appear to assume that the only possible PTR query is a reverse-mapping query
-// (e.g. "1.0.168.192.in-addr.arpa") and if they ever get a PTR query where the first four
-// labels are not all decimal numbers in the range 0-255, they handle that by crashing.
-// These gateways also ignore the remainder of the name following the four decimal numbers
-// -- whether or not it actually says in-addr.arpa, they just make up an answer anyway.
-//
-// The challenge therefore is to craft a query that will discern whether the DNS server
-// is one of these buggy ones, without crashing it. Furthermore we don't want our test
-// queries making it all the way to the root name servers, putting extra load on those
-// name servers and giving Apple a bad reputation. To this end we send this query:
-// dig -t ptr 1.0.0.127.dnsbugtest.1.0.0.127.in-addr.arpa.
-//
-// The text preceding the ".in-addr.arpa." is under 32 bytes, so it won't cause crash (1).
-// It will not yield a large response with the TC bit set, so it won't cause crash (2).
-// It starts with four decimal numbers, so it won't cause crash (3).
-// The name falls within the "1.0.0.127.in-addr.arpa." domain, the reverse-mapping name for the local
-// loopback address, and therefore the query will black-hole at the first properly-configured DNS server
-// it reaches, making it highly unlikely that this query will make it all the way to the root.
-//
-// Finally, the correct response to this query is NXDOMAIN or a similar error, but the
-// gateways that ignore the remainder of the name following the four decimal numbers
-// give themselves away by actually returning a result for this nonsense query.
-
-mDNSlocal const domainname *DNSRelayTestQuestion = (const domainname*)
- "\x1" "1" "\x1" "0" "\x1" "0" "\x3" "127" "\xa" "dnsbugtest"
- "\x1" "1" "\x1" "0" "\x1" "0" "\x3" "127" "\x7" "in-addr" "\x4" "arpa";
-
-// See comments above for DNSRelayTestQuestion
-// If this is the kind of query that has the risk of crashing buggy DNS servers, we do a test question first
-mDNSlocal mDNSBool NoTestQuery(DNSQuestion *q)
- {
- int i;
- mDNSu8 *p = q->qname.c;
- if (q->AuthInfo) return(mDNStrue); // Don't need a test query for private queries sent directly to authoritative server over TLS/TCP
- if (q->qtype != kDNSType_PTR) return(mDNStrue); // Don't need a test query for any non-PTR queries
- for (i=0; i<4; i++) // If qname does not begin with num.num.num.num, can't skip the test query
- {
- if (p[0] < 1 || p[0] > 3) return(mDNSfalse);
- if ( p[1] < '0' || p[1] > '9' ) return(mDNSfalse);
- if (p[0] >= 2 && (p[2] < '0' || p[2] > '9')) return(mDNSfalse);
- if (p[0] >= 3 && (p[3] < '0' || p[3] > '9')) return(mDNSfalse);
- p += 1 + p[0];
- }
- // If remainder of qname is ".in-addr.arpa.", this is a vanilla reverse-mapping query and
- // we can safely do it without needing a test query first, otherwise we need the test query.
- return(SameDomainName((domainname*)p, (const domainname*)"\x7" "in-addr" "\x4" "arpa"));
- }
-
-// Returns mDNStrue if response was handled
-mDNSlocal mDNSBool uDNS_ReceiveTestQuestionResponse(mDNS *const m, DNSMessage *const msg, const mDNSu8 *const end,
- const mDNSAddr *const srcaddr, const mDNSIPPort srcport)
- {
- const mDNSu8 *ptr = msg->data;
- DNSQuestion pktq;
- DNSServer *s;
- mDNSu32 result = 0;
-
- // 1. Find out if this is an answer to one of our test questions
- if (msg->h.numQuestions != 1) return(mDNSfalse);
- ptr = getQuestion(msg, ptr, end, mDNSInterface_Any, &pktq);
- if (!ptr) return(mDNSfalse);
- if (pktq.qtype != kDNSType_PTR || pktq.qclass != kDNSClass_IN) return(mDNSfalse);
- if (!SameDomainName(&pktq.qname, DNSRelayTestQuestion)) return(mDNSfalse);
-
- // 2. If the DNS relay gave us a positive response, then it's got buggy firmware
- // else, if the DNS relay gave us an error or no-answer response, it passed our test
- if ((msg->h.flags.b[1] & kDNSFlag1_RC_Mask) == kDNSFlag1_RC_NoErr && msg->h.numAnswers > 0)
- result = DNSServer_Failed;
- else
- result = DNSServer_Passed;
-
- // 3. Find occurrences of this server in our list, and mark them appropriately
- for (s = m->DNSServers; s; s = s->next)
- {
- mDNSBool matchaddr = (s->teststate != result && mDNSSameAddress(srcaddr, &s->addr) && mDNSSameIPPort(srcport, s->port));
- mDNSBool matchid = (s->teststate == DNSServer_Untested && mDNSSameOpaque16(msg->h.id, s->testid));
- if (matchaddr || matchid)
- {
- DNSQuestion *q;
- s->teststate = result;
- if (result == DNSServer_Passed)
- {
- LogInfo("DNS Server %#a:%d (%#a:%d) %d passed%s",
- &s->addr, mDNSVal16(s->port), srcaddr, mDNSVal16(srcport), mDNSVal16(s->testid),
- matchaddr ? "" : " NOTE: Reply did not come from address to which query was sent");
- }
- else
- {
- LogMsg("NOTE: Wide-Area Service Discovery disabled to avoid crashing defective DNS relay %#a:%d (%#a:%d) %d%s",
- &s->addr, mDNSVal16(s->port), srcaddr, mDNSVal16(srcport), mDNSVal16(s->testid),
- matchaddr ? "" : " NOTE: Reply did not come from address to which query was sent");
- }
-
- // If this server has just changed state from DNSServer_Untested to DNSServer_Passed, then retrigger any waiting questions.
- // We use the NoTestQuery() test so that we only retrigger questions that were actually blocked waiting for this test to complete.
- if (result == DNSServer_Passed) // Unblock any questions that were waiting for this result
- for (q = m->Questions; q; q=q->next)
- if (q->qDNSServer == s && !NoTestQuery(q))
- {
- q->ThisQInterval = INIT_UCAST_POLL_INTERVAL / QuestionIntervalStep;
- q->unansweredQueries = 0;
- q->LastQTime = m->timenow - q->ThisQInterval;
- m->NextScheduledQuery = m->timenow;
- }
- }
- }
-
- return(mDNStrue); // Return mDNStrue to tell uDNS_ReceiveMsg it doesn't need to process this packet further
- }
-
-// Called from mDNSCoreReceive with the lock held
-mDNSexport void uDNS_ReceiveMsg(mDNS *const m, DNSMessage *const msg, const mDNSu8 *const end, const mDNSAddr *const srcaddr, const mDNSIPPort srcport)
- {
- DNSQuestion *qptr;
- mStatus err = mStatus_NoError;
-
- mDNSu8 StdR = kDNSFlag0_QR_Response | kDNSFlag0_OP_StdQuery;
- mDNSu8 UpdateR = kDNSFlag0_QR_Response | kDNSFlag0_OP_Update;
- mDNSu8 QR_OP = (mDNSu8)(msg->h.flags.b[0] & kDNSFlag0_QROP_Mask);
- mDNSu8 rcode = (mDNSu8)(msg->h.flags.b[1] & kDNSFlag1_RC_Mask);
-
- (void)srcport; // Unused
-
- debugf("uDNS_ReceiveMsg from %#-15a with "
- "%2d Question%s %2d Answer%s %2d Authorit%s %2d Additional%s %d bytes",
- srcaddr,
- msg->h.numQuestions, msg->h.numQuestions == 1 ? ", " : "s,",
- msg->h.numAnswers, msg->h.numAnswers == 1 ? ", " : "s,",
- msg->h.numAuthorities, msg->h.numAuthorities == 1 ? "y, " : "ies,",
- msg->h.numAdditionals, msg->h.numAdditionals == 1 ? "" : "s", end - msg->data);
-
- if (QR_OP == StdR)
- {
- //if (srcaddr && recvLLQResponse(m, msg, end, srcaddr, srcport)) return;
- if (uDNS_ReceiveTestQuestionResponse(m, msg, end, srcaddr, srcport)) return;
- for (qptr = m->Questions; qptr; qptr = qptr->next)
- if (msg->h.flags.b[0] & kDNSFlag0_TC && mDNSSameOpaque16(qptr->TargetQID, msg->h.id) && m->timenow - qptr->LastQTime < RESPONSE_WINDOW)
- {
- if (!srcaddr) LogMsg("uDNS_ReceiveMsg: TCP DNS response had TC bit set: ignoring");
- else
- {
- // Don't reuse TCP connections. We might have failed over to a different DNS server
- // while the first TCP connection is in progress. We need a new TCP connection to the
- // new DNS server. So, always try to establish a new connection.
- if (qptr->tcp) { DisposeTCPConn(qptr->tcp); qptr->tcp = mDNSNULL; }
- qptr->tcp = MakeTCPConn(m, mDNSNULL, mDNSNULL, kTCPSocketFlags_Zero, srcaddr, srcport, mDNSNULL, qptr, mDNSNULL);
- }
- }
- }
-
- if (QR_OP == UpdateR)
- {
- mDNSu32 lease = GetPktLease(m, msg, end);
- mDNSs32 expire = m->timenow + (mDNSs32)lease * mDNSPlatformOneSecond;
- mDNSu32 random = mDNSRandom((mDNSs32)lease * mDNSPlatformOneSecond/10);
-
- //rcode = kDNSFlag1_RC_ServFail; // Simulate server failure (rcode 2)
-
- // Walk through all the records that matches the messageID. There could be multiple
- // records if we had sent them in a group
- if (m->CurrentRecord)
- LogMsg("uDNS_ReceiveMsg ERROR m->CurrentRecord already set %s", ARDisplayString(m, m->CurrentRecord));
- m->CurrentRecord = m->ResourceRecords;
- while (m->CurrentRecord)
- {
- AuthRecord *rptr = m->CurrentRecord;
- m->CurrentRecord = m->CurrentRecord->next;
- if (AuthRecord_uDNS(rptr) && mDNSSameOpaque16(rptr->updateid, msg->h.id))
- {
- err = checkUpdateResult(m, rptr->resrec.name, rcode, msg, end);
- if (!err && rptr->uselease && lease)
- if (rptr->expire - expire >= 0 || rptr->state != regState_UpdatePending)
- {
- rptr->expire = expire;
- rptr->refreshCount = 0;
- }
- // We pass the random value to make sure that if we update multiple
- // records, they all get the same random value
- hndlRecordUpdateReply(m, rptr, err, random);
- }
- }
- }
- debugf("Received unexpected response: ID %d matches no active records", mDNSVal16(msg->h.id));
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark - Query Routines
-#endif
-
-mDNSexport void sendLLQRefresh(mDNS *m, DNSQuestion *q)
- {
- mDNSu8 *end;
- LLQOptData llq;
- mDNSu8 *limit = m->omsg.data + AbsoluteMaxDNSMessageData;
-
- if (q->ReqLease)
- if ((q->state == LLQ_Established && q->ntries >= kLLQ_MAX_TRIES) || q->expire - m->timenow < 0)
- {
- LogMsg("Unable to refresh LLQ %##s (%s) - will retry in %d seconds", q->qname.c, DNSTypeName(q->qtype), LLQ_POLL_INTERVAL / mDNSPlatformOneSecond);
- StartLLQPolling(m,q);
- return;
- }
-
- llq.vers = kLLQ_Vers;
- llq.llqOp = kLLQOp_Refresh;
- llq.err = q->tcp ? GetLLQEventPort(m, &q->servAddr) : LLQErr_NoError; // If using TCP tell server what UDP port to send notifications to
- llq.id = q->id;
- llq.llqlease = q->ReqLease;
-
- InitializeDNSMessage(&m->omsg.h, q->TargetQID, uQueryFlags);
- end = putLLQ(&m->omsg, m->omsg.data, q, &llq);
- if (!end) { LogMsg("sendLLQRefresh: putLLQ failed %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); return; }
-
- // Note that we (conditionally) add HINFO and TSIG here, since the question might be going away,
- // so we may not be able to reference it (most importantly it's AuthInfo) when we actually send the message
- end = putHINFO(m, &m->omsg, end, q->AuthInfo, limit);
- if (!end) { LogMsg("sendLLQRefresh: putHINFO failed %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); return; }
-
- if (PrivateQuery(q))
- {
- DNSDigest_SignMessageHostByteOrder(&m->omsg, &end, q->AuthInfo);
- if (!end) { LogMsg("sendLLQRefresh: DNSDigest_SignMessage failed %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); return; }
- }
-
- if (PrivateQuery(q) && !q->tcp)
- {
- LogInfo("sendLLQRefresh setting up new TLS session %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- if (!q->nta) { LogMsg("sendLLQRefresh:ERROR!! q->nta is NULL for %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); return; }
- q->tcp = MakeTCPConn(m, &m->omsg, end, kTCPSocketFlags_UseTLS, &q->servAddr, q->servPort, &q->nta->Host, q, mDNSNULL);
- }
- else
- {
- mStatus err;
-
- // if AuthInfo and AuthInfo->AutoTunnel is set, we use the TCP socket but don't need to pass the AuthInfo as
- // we already protected the message above.
- LogInfo("sendLLQRefresh: using existing %s session %##s (%s)", PrivateQuery(q) ? "TLS" : "UDP",
- q->qname.c, DNSTypeName(q->qtype));
-
- err = mDNSSendDNSMessage(m, &m->omsg, end, mDNSInterface_Any, q->LocalSocket, &q->servAddr, q->servPort, q->tcp ? q->tcp->sock : mDNSNULL, mDNSNULL);
- if (err)
- {
- LogMsg("sendLLQRefresh: mDNSSendDNSMessage%s failed: %d", q->tcp ? " (TCP)" : "", err);
- if (q->tcp) { DisposeTCPConn(q->tcp); q->tcp = mDNSNULL; }
- }
- }
-
- q->ntries++;
-
- debugf("sendLLQRefresh ntries %d %##s (%s)", q->ntries, q->qname.c, DNSTypeName(q->qtype));
-
- q->LastQTime = m->timenow;
- SetNextQueryTime(m, q);
- }
-
-mDNSexport void LLQGotZoneData(mDNS *const m, mStatus err, const ZoneData *zoneInfo)
- {
- DNSQuestion *q = (DNSQuestion *)zoneInfo->ZoneDataContext;
-
- mDNS_Lock(m);
-
- // If we get here it means that the GetZoneData operation has completed.
- // We hold on to the zone data if it is AutoTunnel as we use the hostname
- // in zoneInfo during the TLS connection setup.
- q->servAddr = zeroAddr;
- q->servPort = zeroIPPort;
-
- if (!err && zoneInfo && !mDNSIPPortIsZero(zoneInfo->Port) && !mDNSAddressIsZero(&zoneInfo->Addr) && zoneInfo->Host.c[0])
- {
- q->servAddr = zoneInfo->Addr;
- q->servPort = zoneInfo->Port;
- if (!PrivateQuery(q))
- {
- // We don't need the zone data as we use it only for the Host information which we
- // don't need if we are not going to use TLS connections.
- if (q->nta)
- {
- if (q->nta != zoneInfo) LogMsg("LLQGotZoneData: nta (%p) != zoneInfo (%p) %##s (%s)", q->nta, zoneInfo, q->qname.c, DNSTypeName(q->qtype));
- CancelGetZoneData(m, q->nta);
- q->nta = mDNSNULL;
- }
- }
- q->ntries = 0;
- debugf("LLQGotZoneData %#a:%d", &q->servAddr, mDNSVal16(q->servPort));
- startLLQHandshake(m, q);
- }
- else
- {
- if (q->nta)
- {
- if (q->nta != zoneInfo) LogMsg("LLQGotZoneData: nta (%p) != zoneInfo (%p) %##s (%s)", q->nta, zoneInfo, q->qname.c, DNSTypeName(q->qtype));
- CancelGetZoneData(m, q->nta);
- q->nta = mDNSNULL;
- }
- StartLLQPolling(m,q);
- if (err == mStatus_NoSuchNameErr)
- {
- // this actually failed, so mark it by setting address to all ones
- q->servAddr.type = mDNSAddrType_IPv4;
- q->servAddr.ip.v4 = onesIPv4Addr;
- }
- }
-
- mDNS_Unlock(m);
- }
-
-// Called in normal callback context (i.e. mDNS_busy and mDNS_reentrancy are both 1)
-mDNSlocal void PrivateQueryGotZoneData(mDNS *const m, mStatus err, const ZoneData *zoneInfo)
- {
- DNSQuestion *q = (DNSQuestion *) zoneInfo->ZoneDataContext;
-
- LogInfo("PrivateQueryGotZoneData %##s (%s) err %d Zone %##s Private %d", q->qname.c, DNSTypeName(q->qtype), err, zoneInfo->ZoneName.c, zoneInfo->ZonePrivate);
-
- if (q->nta != zoneInfo) LogMsg("PrivateQueryGotZoneData:ERROR!!: nta (%p) != zoneInfo (%p) %##s (%s)", q->nta, zoneInfo, q->qname.c, DNSTypeName(q->qtype));
-
- if (err || !zoneInfo || mDNSAddressIsZero(&zoneInfo->Addr) || mDNSIPPortIsZero(zoneInfo->Port) || !zoneInfo->Host.c[0])
- {
- LogInfo("PrivateQueryGotZoneData: ERROR!! %##s (%s) invoked with error code %d %p %#a:%d",
- q->qname.c, DNSTypeName(q->qtype), err, zoneInfo,
- zoneInfo ? &zoneInfo->Addr : mDNSNULL,
- zoneInfo ? mDNSVal16(zoneInfo->Port) : 0);
- CancelGetZoneData(m, q->nta);
- q->nta = mDNSNULL;
- return;
- }
-
- if (!zoneInfo->ZonePrivate)
- {
- debugf("Private port lookup failed -- retrying without TLS -- %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- q->AuthInfo = mDNSNULL; // Clear AuthInfo so we try again non-private
- q->ThisQInterval = InitialQuestionInterval;
- q->LastQTime = m->timenow - q->ThisQInterval;
- CancelGetZoneData(m, q->nta);
- q->nta = mDNSNULL;
- mDNS_Lock(m);
- SetNextQueryTime(m, q);
- mDNS_Unlock(m);
- return;
- // Next call to uDNS_CheckCurrentQuestion() will do this as a non-private query
- }
-
- if (!PrivateQuery(q))
- {
- LogMsg("PrivateQueryGotZoneData: ERROR!! Not a private query %##s (%s) AuthInfo %p", q->qname.c, DNSTypeName(q->qtype), q->AuthInfo);
- CancelGetZoneData(m, q->nta);
- q->nta = mDNSNULL;
- return;
- }
-
- q->TargetQID = mDNS_NewMessageID(m);
- if (q->tcp) { DisposeTCPConn(q->tcp); q->tcp = mDNSNULL; }
- if (!q->nta) { LogMsg("PrivateQueryGotZoneData:ERROR!! nta is NULL for %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); return; }
- q->tcp = MakeTCPConn(m, mDNSNULL, mDNSNULL, kTCPSocketFlags_UseTLS, &zoneInfo->Addr, zoneInfo->Port, &q->nta->Host, q, mDNSNULL);
- if (q->nta) { CancelGetZoneData(m, q->nta); q->nta = mDNSNULL; }
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark - Dynamic Updates
-#endif
-
-// Called in normal callback context (i.e. mDNS_busy and mDNS_reentrancy are both 1)
-mDNSexport void RecordRegistrationGotZoneData(mDNS *const m, mStatus err, const ZoneData *zoneData)
- {
- AuthRecord *newRR = (AuthRecord*)zoneData->ZoneDataContext;
- AuthRecord *ptr;
- int c1, c2;
-
- if (newRR->nta != zoneData)
- LogMsg("RecordRegistrationGotZoneData: nta (%p) != zoneData (%p) %##s (%s)", newRR->nta, zoneData, newRR->resrec.name->c, DNSTypeName(newRR->resrec.rrtype));
-
- if (m->mDNS_busy != m->mDNS_reentrancy)
- LogMsg("RecordRegistrationGotZoneData: mDNS_busy (%ld) != mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy);
-
- // make sure record is still in list (!!!)
- for (ptr = m->ResourceRecords; ptr; ptr = ptr->next) if (ptr == newRR) break;
- if (!ptr)
- {
- LogMsg("RecordRegistrationGotZoneData - RR no longer in list. Discarding.");
- CancelGetZoneData(m, newRR->nta);
- newRR->nta = mDNSNULL;
- return;
- }
-
- // check error/result
- if (err)
- {
- if (err != mStatus_NoSuchNameErr) LogMsg("RecordRegistrationGotZoneData: error %d", err);
- CancelGetZoneData(m, newRR->nta);
- newRR->nta = mDNSNULL;
- return;
- }
-
- if (!zoneData) { LogMsg("ERROR: RecordRegistrationGotZoneData invoked with NULL result and no error"); return; }
-
- if (newRR->resrec.rrclass != zoneData->ZoneClass)
- {
- LogMsg("ERROR: New resource record's class (%d) does not match zone class (%d)", newRR->resrec.rrclass, zoneData->ZoneClass);
- CancelGetZoneData(m, newRR->nta);
- newRR->nta = mDNSNULL;
- return;
- }
-
- // Don't try to do updates to the root name server.
- // We might be tempted also to block updates to any single-label name server (e.g. com, edu, net, etc.) but some
- // organizations use their own private pseudo-TLD, like ".home", etc, and we don't want to block that.
- if (zoneData->ZoneName.c[0] == 0)
- {
- LogInfo("RecordRegistrationGotZoneData: No name server found claiming responsibility for \"%##s\"!", newRR->resrec.name->c);
- CancelGetZoneData(m, newRR->nta);
- newRR->nta = mDNSNULL;
- return;
- }
-
- // Store discovered zone data
- c1 = CountLabels(newRR->resrec.name);
- c2 = CountLabels(&zoneData->ZoneName);
- if (c2 > c1)
- {
- LogMsg("RecordRegistrationGotZoneData: Zone \"%##s\" is longer than \"%##s\"", zoneData->ZoneName.c, newRR->resrec.name->c);
- CancelGetZoneData(m, newRR->nta);
- newRR->nta = mDNSNULL;
- return;
- }
- newRR->zone = SkipLeadingLabels(newRR->resrec.name, c1-c2);
- if (!SameDomainName(newRR->zone, &zoneData->ZoneName))
- {
- LogMsg("RecordRegistrationGotZoneData: Zone \"%##s\" does not match \"%##s\" for \"%##s\"", newRR->zone->c, zoneData->ZoneName.c, newRR->resrec.name->c);
- CancelGetZoneData(m, newRR->nta);
- newRR->nta = mDNSNULL;
- return;
- }
-
- if (mDNSIPPortIsZero(zoneData->Port) || mDNSAddressIsZero(&zoneData->Addr) || !zoneData->Host.c[0])
- {
- LogInfo("RecordRegistrationGotZoneData: No _dns-update._udp service found for \"%##s\"!", newRR->resrec.name->c);
- CancelGetZoneData(m, newRR->nta);
- newRR->nta = mDNSNULL;
- return;
- }
-
- newRR->Private = zoneData->ZonePrivate;
- debugf("RecordRegistrationGotZoneData: Set zone information for %##s %##s to %#a:%d",
- newRR->resrec.name->c, zoneData->ZoneName.c, &zoneData->Addr, mDNSVal16(zoneData->Port));
-
- // If we are deregistering, uDNS_DeregisterRecord will do that as it has the zone data now.
- if (newRR->state == regState_DeregPending)
- {
- mDNS_Lock(m);
- uDNS_DeregisterRecord(m, newRR);
- mDNS_Unlock(m);
- return;
- }
-
- if (newRR->resrec.rrtype == kDNSType_SRV)
- {
- const domainname *target;
- // Reevaluate the target always as NAT/Target could have changed while
- // we were fetching zone data.
- mDNS_Lock(m);
- target = GetServiceTarget(m, newRR);
- mDNS_Unlock(m);
- if (!target || target->c[0] == 0)
- {
- domainname *t = GetRRDomainNameTarget(&newRR->resrec);
- LogInfo("RecordRegistrationGotZoneData - no target for %##s", newRR->resrec.name->c);
- if (t) t->c[0] = 0;
- newRR->resrec.rdlength = newRR->resrec.rdestimate = 0;
- newRR->state = regState_NoTarget;
- CancelGetZoneData(m, newRR->nta);
- newRR->nta = mDNSNULL;
- return;
- }
- }
- // If we have non-zero service port (always?)
- // and a private address, and update server is non-private
- // and this service is AutoTarget
- // then initiate a NAT mapping request. On completion it will do SendRecordRegistration() for us
- if (newRR->resrec.rrtype == kDNSType_SRV && !mDNSIPPortIsZero(newRR->resrec.rdata->u.srv.port) &&
- mDNSv4AddrIsRFC1918(&m->AdvertisedV4.ip.v4) && newRR->nta && !mDNSAddrIsRFC1918(&newRR->nta->Addr) &&
- newRR->AutoTarget == Target_AutoHostAndNATMAP)
- {
- DomainAuthInfo *AuthInfo;
- AuthInfo = GetAuthInfoForName(m, newRR->resrec.name);
- if (AuthInfo && AuthInfo->AutoTunnel)
- {
- domainname *t = GetRRDomainNameTarget(&newRR->resrec);
- LogMsg("RecordRegistrationGotZoneData: ERROR!! AutoTunnel has Target_AutoHostAndNATMAP for %s", ARDisplayString(m, newRR));
- if (t) t->c[0] = 0;
- newRR->resrec.rdlength = newRR->resrec.rdestimate = 0;
- newRR->state = regState_NoTarget;
- CancelGetZoneData(m, newRR->nta);
- newRR->nta = mDNSNULL;
- return;
- }
- // During network transitions, we are called multiple times in different states. Setup NAT
- // state just once for this record.
- if (!newRR->NATinfo.clientContext)
- {
- LogInfo("RecordRegistrationGotZoneData StartRecordNatMap %s", ARDisplayString(m, newRR));
- newRR->state = regState_NATMap;
- StartRecordNatMap(m, newRR);
- return;
- }
- else LogInfo("RecordRegistrationGotZoneData: StartRecordNatMap for %s, state %d, context %p", ARDisplayString(m, newRR), newRR->state, newRR->NATinfo.clientContext);
- }
- mDNS_Lock(m);
- // We want IsRecordMergeable to check whether it is a record whose update can be
- // sent with others. We set the time before we call IsRecordMergeable, so that
- // it does not fail this record based on time. We are interested in other checks
- // at this time. If a previous update resulted in error, then don't reset the
- // interval. Preserve the back-off so that we don't keep retrying aggressively.
- if (newRR->updateError == mStatus_NoError)
- {
- newRR->ThisAPInterval = INIT_RECORD_REG_INTERVAL;
- newRR->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL;
- }
- if (IsRecordMergeable(m, newRR, m->timenow + MERGE_DELAY_TIME))
- {
- // Delay the record registration by MERGE_DELAY_TIME so that we can merge them
- // into one update
- LogInfo("RecordRegistrationGotZoneData: Delayed registration for %s", ARDisplayString(m, newRR));
- newRR->LastAPTime += MERGE_DELAY_TIME;
- }
- mDNS_Unlock(m);
- }
-
-mDNSlocal void SendRecordDeregistration(mDNS *m, AuthRecord *rr)
- {
- mDNSu8 *ptr = m->omsg.data;
- mDNSu8 *limit;
- DomainAuthInfo *AuthInfo;
-
- if (m->mDNS_busy != m->mDNS_reentrancy+1)
- LogMsg("SendRecordDeRegistration: Lock not held! mDNS_busy (%ld) mDNS_reentrancy (%ld)", m->mDNS_busy, m->mDNS_reentrancy);
-
- if (!rr->nta || mDNSIPv4AddressIsZero(rr->nta->Addr.ip.v4))
- {
- LogMsg("SendRecordDeRegistration: No zone info for Resource record %s RecordType %d", ARDisplayString(m, rr), rr->resrec.RecordType);
- return;
- }
-
- limit = ptr + AbsoluteMaxDNSMessageData;
- AuthInfo = GetAuthInfoForName_internal(m, rr->resrec.name);
- limit -= RRAdditionalSize(m, AuthInfo);
-
- rr->updateid = mDNS_NewMessageID(m);
- InitializeDNSMessage(&m->omsg.h, rr->updateid, UpdateReqFlags);
-
- // set zone
- ptr = putZone(&m->omsg, ptr, limit, rr->zone, mDNSOpaque16fromIntVal(rr->resrec.rrclass));
- if (!ptr) goto exit;
-
- ptr = BuildUpdateMessage(m, ptr, rr, limit);
-
- if (!ptr) goto exit;
-
- if (rr->Private)
- {
- LogInfo("SendRecordDeregistration TCP %p %s", rr->tcp, ARDisplayString(m, rr));
- if (rr->tcp) LogInfo("SendRecordDeregistration: Disposing existing TCP connection for %s", ARDisplayString(m, rr));
- if (rr->tcp) { DisposeTCPConn(rr->tcp); rr->tcp = mDNSNULL; }
- if (!rr->nta) { LogMsg("SendRecordDeregistration:Private:ERROR!! nta is NULL for %s", ARDisplayString(m, rr)); return; }
- rr->tcp = MakeTCPConn(m, &m->omsg, ptr, kTCPSocketFlags_UseTLS, &rr->nta->Addr, rr->nta->Port, &rr->nta->Host, mDNSNULL, rr);
- }
- else
- {
- mStatus err;
- LogInfo("SendRecordDeregistration UDP %s", ARDisplayString(m, rr));
- if (!rr->nta) { LogMsg("SendRecordDeregistration:ERROR!! nta is NULL for %s", ARDisplayString(m, rr)); return; }
- err = mDNSSendDNSMessage(m, &m->omsg, ptr, mDNSInterface_Any, mDNSNULL, &rr->nta->Addr, rr->nta->Port, mDNSNULL, GetAuthInfoForName_internal(m, rr->resrec.name));
- if (err) debugf("ERROR: SendRecordDeregistration - mDNSSendDNSMessage - %d", err);
- //if (rr->state == regState_DeregPending) CompleteDeregistration(m, rr); // Don't touch rr after this
- }
- SetRecordRetry(m, rr, 0);
- return;
-exit:
- LogMsg("SendRecordDeregistration: Error formatting message for %s", ARDisplayString(m, rr));
- }
-
-mDNSexport mStatus uDNS_DeregisterRecord(mDNS *const m, AuthRecord *const rr)
- {
- DomainAuthInfo *info;
-
- LogInfo("uDNS_DeregisterRecord: Resource Record %s, state %d", ARDisplayString(m, rr), rr->state);
-
- switch (rr->state)
- {
- case regState_Refresh:
- case regState_Pending:
- case regState_UpdatePending:
- case regState_Registered: break;
- case regState_DeregPending: break;
-
- case regState_NATError:
- case regState_NATMap:
- // A record could be in NoTarget to start with if the corresponding SRV record could not find a target.
- // It is also possible to reenter the NoTarget state when we move to a network with a NAT that has
- // no NAT-PMP/UPnP support. In that case before we entered NoTarget, we already deregistered with
- // the server.
- case regState_NoTarget:
- case regState_Unregistered:
- case regState_Zero:
- default:
- LogInfo("uDNS_DeregisterRecord: State %d for %##s type %s", rr->state, rr->resrec.name->c, DNSTypeName(rr->resrec.rrtype));
- // This function may be called during sleep when there are no sleep proxy servers
- if (rr->resrec.RecordType == kDNSRecordTypeDeregistering) CompleteDeregistration(m, rr);
- return mStatus_NoError;
- }
-
- // If a current group registration is pending, we can't send this deregisration till that registration
- // has reached the server i.e., the ordering is important. Previously, if we did not send this
- // registration in a group, then the previous connection will be torn down as part of sending the
- // deregistration. If we send this in a group, we need to locate the resource record that was used
- // to send this registration and terminate that connection. This means all the updates on that might
- // be lost (assuming the response is not waiting for us at the socket) and the retry will send the
- // update again sometime in the near future.
- //
- // NOTE: SSL handshake failures normally free the TCP connection immediately. Hence, you may not
- // find the TCP below there. This case can happen only when tcp is trying to actively retransmit
- // the request or SSL negotiation taking time i.e resource record is actively trying to get the
- // message to the server. During that time a deregister has to happen.
-
- if (!mDNSOpaque16IsZero(rr->updateid))
- {
- AuthRecord *anchorRR;
- mDNSBool found = mDNSfalse;
- for (anchorRR = m->ResourceRecords; anchorRR; anchorRR = anchorRR->next)
- {
- if (AuthRecord_uDNS(rr) && mDNSSameOpaque16(anchorRR->updateid, rr->updateid) && anchorRR->tcp)
- {
- LogInfo("uDNS_DeregisterRecord: Found Anchor RR %s terminated", ARDisplayString(m, anchorRR));
- if (found)
- LogMsg("uDNS_DeregisterRecord: ERROR: Another anchorRR %s found", ARDisplayString(m, anchorRR));
- DisposeTCPConn(anchorRR->tcp);
- anchorRR->tcp = mDNSNULL;
- found = mDNStrue;
- }
- }
- if (!found) LogInfo("uDNSDeregisterRecord: Cannot find the anchor Resource Record for %s, not an error", ARDisplayString(m, rr));
- }
-
- // Retry logic for deregistration should be no different from sending registration the first time.
- // Currently ThisAPInterval most likely is set to the refresh interval
- rr->state = regState_DeregPending;
- rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL;
- rr->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL;
- info = GetAuthInfoForName_internal(m, rr->resrec.name);
- if (IsRecordMergeable(m, rr, m->timenow + MERGE_DELAY_TIME))
- {
- // Delay the record deregistration by MERGE_DELAY_TIME so that we can merge them
- // into one update. If the domain is being deleted, delay by 2 * MERGE_DELAY_TIME
- // so that we can merge all the AutoTunnel records and the service records in
- // one update (they get deregistered a little apart)
- if (info && info->deltime) rr->LastAPTime += (2 * MERGE_DELAY_TIME);
- else rr->LastAPTime += MERGE_DELAY_TIME;
- }
- // IsRecordMergeable could have returned false for several reasons e.g., DontMerge is set or
- // no zone information. Most likely it is the latter, CheckRecordUpdates will fetch the zone
- // data when it encounters this record.
-
- if (m->NextuDNSEvent - (rr->LastAPTime + rr->ThisAPInterval) >= 0)
- m->NextuDNSEvent = (rr->LastAPTime + rr->ThisAPInterval);
-
- return mStatus_NoError;
- }
-
-mDNSexport mStatus uDNS_UpdateRecord(mDNS *m, AuthRecord *rr)
- {
- LogInfo("uDNS_UpdateRecord: Resource Record %##s, state %d", rr->resrec.name->c, rr->state);
- switch(rr->state)
- {
- case regState_DeregPending:
- case regState_Unregistered:
- // not actively registered
- goto unreg_error;
-
- case regState_NATMap:
- case regState_NoTarget:
- // change rdata directly since it hasn't been sent yet
- if (rr->UpdateCallback) rr->UpdateCallback(m, rr, rr->resrec.rdata, rr->resrec.rdlength);
- SetNewRData(&rr->resrec, rr->NewRData, rr->newrdlength);
- rr->NewRData = mDNSNULL;
- return mStatus_NoError;
-
- case regState_Pending:
- case regState_Refresh:
- case regState_UpdatePending:
- // registration in-flight. queue rdata and return
- if (rr->QueuedRData && rr->UpdateCallback)
- // if unsent rdata is already queued, free it before we replace it
- rr->UpdateCallback(m, rr, rr->QueuedRData, rr->QueuedRDLen);
- rr->QueuedRData = rr->NewRData;
- rr->QueuedRDLen = rr->newrdlength;
- rr->NewRData = mDNSNULL;
- return mStatus_NoError;
-
- case regState_Registered:
- rr->OrigRData = rr->resrec.rdata;
- rr->OrigRDLen = rr->resrec.rdlength;
- rr->InFlightRData = rr->NewRData;
- rr->InFlightRDLen = rr->newrdlength;
- rr->NewRData = mDNSNULL;
- rr->state = regState_UpdatePending;
- rr->ThisAPInterval = INIT_RECORD_REG_INTERVAL;
- rr->LastAPTime = m->timenow - INIT_RECORD_REG_INTERVAL;
- return mStatus_NoError;
-
- case regState_NATError:
- LogMsg("ERROR: uDNS_UpdateRecord called for record %##s with bad state regState_NATError", rr->resrec.name->c);
- return mStatus_UnknownErr; // states for service records only
-
- default: LogMsg("uDNS_UpdateRecord: Unknown state %d for %##s", rr->state, rr->resrec.name->c);
- }
-
- unreg_error:
- LogMsg("uDNS_UpdateRecord: Requested update of record %##s type %d, in erroneous state %d",
- rr->resrec.name->c, rr->resrec.rrtype, rr->state);
- return mStatus_Invalid;
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark - Periodic Execution Routines
-#endif
-
-// The question to be checked is not passed in as an explicit parameter;
-// instead it is implicit that the question to be checked is m->CurrentQuestion.
-mDNSexport void uDNS_CheckCurrentQuestion(mDNS *const m)
- {
- DNSQuestion *q = m->CurrentQuestion;
- if (m->timenow - NextQSendTime(q) < 0) return;
-
- if (q->LongLived)
- {
- switch (q->state)
- {
- case LLQ_InitialRequest: startLLQHandshake(m, q); break;
- case LLQ_SecondaryRequest:
- // For PrivateQueries, we need to start the handshake again as we don't do the Challenge/Response step
- if (PrivateQuery(q))
- startLLQHandshake(m, q);
- else
- sendChallengeResponse(m, q, mDNSNULL);
- break;
- case LLQ_Established: sendLLQRefresh(m, q); break;
- case LLQ_Poll: break; // Do nothing (handled below)
- }
- }
-
- // We repeat the check above (rather than just making this the "else" case) because startLLQHandshake can change q->state to LLQ_Poll
- if (!(q->LongLived && q->state != LLQ_Poll))
- {
- if (q->unansweredQueries >= MAX_UCAST_UNANSWERED_QUERIES)
- {
- DNSServer *orig = q->qDNSServer;
- if (orig)
- LogInfo("uDNS_CheckCurrentQuestion: Sent %d unanswered queries for %##s (%s) to %#a:%d (%##s)",
- q->unansweredQueries, q->qname.c, DNSTypeName(q->qtype), &orig->addr, mDNSVal16(orig->port), orig->domain.c);
-
- PenalizeDNSServer(m, q);
- q->noServerResponse = 1;
- }
- // There are two cases here.
- //
- // 1. We have only one DNS server for this question. It is not responding even after we sent MAX_UCAST_UNANSWERED_QUERIES.
- // In that case, we need to keep retrying till we get a response. But we need to backoff as we retry. We set
- // noServerResponse in the block above and below we do not touch the question interval. When we come here, we
- // already waited for the response. We need to send another query right at this moment. We do that below by
- // reinitializing dns servers and reissuing the query.
- //
- // 2. We have more than one DNS server. If at least one server did not respond, we would have set noServerResponse
- // either now (the last server in the list) or before (non-last server in the list). In either case, if we have
- // reached the end of DNS server list, we need to try again from the beginning. Ideally we should try just the
- // servers that did not respond, but for simplicity we try all the servers. Once we reached the end of list, we
- // set triedAllServersOnce so that we don't try all the servers aggressively. See PenalizeDNSServer.
- if (!q->qDNSServer && q->noServerResponse)
- {
- DNSServer *new;
- DNSQuestion *qptr;
- q->triedAllServersOnce = 1;
- // Re-initialize all DNS servers for this question. If we have a DNSServer, DNSServerChangeForQuestion will
- // handle all the work including setting the new DNS server.
- SetValidDNSServers(m, q);
- new = GetServerForQuestion(m, q);
- if (new)
- {
- LogInfo("uDNS_checkCurrentQuestion: Retrying question %p %##s (%s) DNS Server %#a:%d ThisQInterval %d",
- q, q->qname.c, DNSTypeName(q->qtype), new ? &new->addr : mDNSNULL, mDNSVal16(new ? new->port : zeroIPPort), q->ThisQInterval);
- DNSServerChangeForQuestion(m, q, new);
- }
- for (qptr = q->next ; qptr; qptr = qptr->next)
- if (qptr->DuplicateOf == q) { qptr->validDNSServers = q->validDNSServers; qptr->qDNSServer = q->qDNSServer; }
- }
- if (q->qDNSServer && q->qDNSServer->teststate != DNSServer_Disabled)
- {
- mDNSu8 *end = m->omsg.data;
- mStatus err = mStatus_NoError;
- mDNSBool private = mDNSfalse;
-
- InitializeDNSMessage(&m->omsg.h, q->TargetQID, uQueryFlags);
-
- if (q->qDNSServer->teststate != DNSServer_Untested || NoTestQuery(q))
- {
- end = putQuestion(&m->omsg, m->omsg.data, m->omsg.data + AbsoluteMaxDNSMessageData, &q->qname, q->qtype, q->qclass);
- private = PrivateQuery(q);
- }
- else if (m->timenow - q->qDNSServer->lasttest >= INIT_UCAST_POLL_INTERVAL) // Make sure at least three seconds has elapsed since last test query
- {
- LogInfo("Sending DNS test query to %#a:%d", &q->qDNSServer->addr, mDNSVal16(q->qDNSServer->port));
- q->ThisQInterval = INIT_UCAST_POLL_INTERVAL / QuestionIntervalStep;
- q->qDNSServer->lasttest = m->timenow;
- end = putQuestion(&m->omsg, m->omsg.data, m->omsg.data + AbsoluteMaxDNSMessageData, DNSRelayTestQuestion, kDNSType_PTR, kDNSClass_IN);
- q->qDNSServer->testid = m->omsg.h.id;
- }
-
- if (end > m->omsg.data && (q->qDNSServer->teststate != DNSServer_Failed || NoTestQuery(q)))
- {
- //LogMsg("uDNS_CheckCurrentQuestion %p %d %p %##s (%s)", q, NextQSendTime(q) - m->timenow, private, q->qname.c, DNSTypeName(q->qtype));
- if (private)
- {
- if (q->nta) CancelGetZoneData(m, q->nta);
- q->nta = StartGetZoneData(m, &q->qname, q->LongLived ? ZoneServiceLLQ : ZoneServiceQuery, PrivateQueryGotZoneData, q);
- if (q->state == LLQ_Poll) q->ThisQInterval = (LLQ_POLL_INTERVAL + mDNSRandom(LLQ_POLL_INTERVAL/10)) / QuestionIntervalStep;
- }
- else
- {
- debugf("uDNS_CheckCurrentQuestion sending %p %##s (%s) %#a:%d UnansweredQueries %d",
- q, q->qname.c, DNSTypeName(q->qtype),
- q->qDNSServer ? &q->qDNSServer->addr : mDNSNULL, mDNSVal16(q->qDNSServer ? q->qDNSServer->port : zeroIPPort), q->unansweredQueries);
- if (!q->LocalSocket) q->LocalSocket = mDNSPlatformUDPSocket(m, zeroIPPort);
- if (!q->LocalSocket) err = mStatus_NoMemoryErr; // If failed to make socket (should be very rare), we'll try again next time
- else err = mDNSSendDNSMessage(m, &m->omsg, end, q->qDNSServer->interface, q->LocalSocket, &q->qDNSServer->addr, q->qDNSServer->port, mDNSNULL, mDNSNULL);
- }
- }
-
- if (err) debugf("ERROR: uDNS_idle - mDNSSendDNSMessage - %d", err); // surpress syslog messages if we have no network
- else
- {
- q->ThisQInterval = q->ThisQInterval * QuestionIntervalStep; // Only increase interval if send succeeded
- q->unansweredQueries++;
- if (q->ThisQInterval > MAX_UCAST_POLL_INTERVAL)
- q->ThisQInterval = MAX_UCAST_POLL_INTERVAL;
- if (private && q->state != LLQ_Poll)
- {
- // We don't want to retransmit too soon. Hence, we always schedule our first
- // retransmisson at 3 seconds rather than one second
- if (q->ThisQInterval < (3 * mDNSPlatformOneSecond))
- q->ThisQInterval = q->ThisQInterval * QuestionIntervalStep;
- if (q->ThisQInterval > LLQ_POLL_INTERVAL)
- q->ThisQInterval = LLQ_POLL_INTERVAL;
- LogInfo("uDNS_CheckCurrentQuestion: private non polling question for %##s (%s) will be retried in %d ms", q->qname.c, DNSTypeName(q->qtype), q->ThisQInterval);
- }
- if (q->qDNSServer->cellIntf)
- {
- // We don't want to retransmit too soon. Schedule our first retransmisson at
- // MIN_UCAST_RETRANS_TIMEOUT seconds.
- if (q->ThisQInterval < MIN_UCAST_RETRANS_TIMEOUT)
- q->ThisQInterval = MIN_UCAST_RETRANS_TIMEOUT;
- }
- debugf("uDNS_CheckCurrentQuestion: Increased ThisQInterval to %d for %##s (%s), cell %d", q->ThisQInterval, q->qname.c, DNSTypeName(q->qtype), q->qDNSServer->cellIntf);
- }
- q->LastQTime = m->timenow;
- SetNextQueryTime(m, q);
- }
- else
- {
- // If we have no server for this query, or the only server is a disabled one, then we deliver
- // a transient failure indication to the client. This is important for things like iPhone
- // where we want to return timely feedback to the user when no network is available.
- // After calling MakeNegativeCacheRecord() we store the resulting record in the
- // cache so that it will be visible to other clients asking the same question.
- // (When we have a group of identical questions, only the active representative of the group gets
- // passed to uDNS_CheckCurrentQuestion -- we only want one set of query packets hitting the wire --
- // but we want *all* of the questions to get answer callbacks.)
-
- CacheRecord *rr;
- const mDNSu32 slot = HashSlot(&q->qname);
- CacheGroup *const cg = CacheGroupForName(m, slot, q->qnamehash, &q->qname);
- if (cg)
- for (rr = cg->members; rr; rr=rr->next)
- if (SameNameRecordAnswersQuestion(&rr->resrec, q)) mDNS_PurgeCacheResourceRecord(m, rr);
-
- if (!q->qDNSServer)
- {
- if (!mDNSOpaque64IsZero(&q->validDNSServers))
- LogMsg("uDNS_CheckCurrentQuestion: ERROR!!: valid DNSServer bits not zero 0x%x, 0x%x for question %##s (%s)",
- q->validDNSServers.l[1], q->validDNSServers.l[0], q->qname.c, DNSTypeName(q->qtype));
- // If we reached the end of list while picking DNS servers, then we don't want to deactivate the
- // question. Try after 60 seconds. We find this by looking for valid DNSServers for this question,
- // if we find any, then we must have tried them before we came here. This avoids maintaining
- // another state variable to see if we had valid DNS servers for this question.
- SetValidDNSServers(m, q);
- if (mDNSOpaque64IsZero(&q->validDNSServers))
- {
- LogInfo("uDNS_CheckCurrentQuestion: no DNS server for %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- q->ThisQInterval = 0;
- }
- else
- {
- DNSQuestion *qptr;
- // Pretend that we sent this question. As this is an ActiveQuestion, the NextScheduledQuery should
- // be set properly. Also, we need to properly backoff in cases where we don't set the question to
- // MaxQuestionInterval when we answer the question e.g., LongLived, we need to keep backing off
- q->ThisQInterval = q->ThisQInterval * QuestionIntervalStep;
- q->LastQTime = m->timenow;
- SetNextQueryTime(m, q);
- // Pick a new DNS server now. Otherwise, when the cache is 80% of its expiry, we will try
- // to send a query and come back to the same place here and log the above message.
- q->qDNSServer = GetServerForQuestion(m, q);
- for (qptr = q->next ; qptr; qptr = qptr->next)
- if (qptr->DuplicateOf == q) { qptr->validDNSServers = q->validDNSServers; qptr->qDNSServer = q->qDNSServer; }
- LogInfo("uDNS_checkCurrentQuestion: Tried all DNS servers, retry question %p SuppressUnusable %d %##s (%s) with DNS Server %#a:%d after 60 seconds, ThisQInterval %d",
- q, q->SuppressUnusable, q->qname.c, DNSTypeName(q->qtype),
- q->qDNSServer ? &q->qDNSServer->addr : mDNSNULL, mDNSVal16(q->qDNSServer ? q->qDNSServer->port : zeroIPPort), q->ThisQInterval);
- }
- }
- else
- {
- q->ThisQInterval = 0;
- LogMsg("uDNS_CheckCurrentQuestion DNS server %#a:%d for %##s is disabled", &q->qDNSServer->addr, mDNSVal16(q->qDNSServer->port), q->qname.c);
- }
-
- // For some of the WAB queries that we generate form within the mDNSResponder, most of the home routers
- // don't understand and return ServFail/NXDomain. In those cases, we don't want to try too often. We try
- // every fifteen minutes in that case
- MakeNegativeCacheRecord(m, &m->rec.r, &q->qname, q->qnamehash, q->qtype, q->qclass, (DomainEnumQuery(&q->qname) ? 60 * 15 : 60), mDNSInterface_Any, q->qDNSServer);
- q->unansweredQueries = 0;
- // We're already using the m->CurrentQuestion pointer, so CacheRecordAdd can't use it to walk the question list.
- // To solve this problem we set rr->DelayDelivery to a nonzero value (which happens to be 'now') so that we
- // momentarily defer generating answer callbacks until mDNS_Execute time.
- CreateNewCacheEntry(m, slot, cg, NonZeroTime(m->timenow));
- ScheduleNextCacheCheckTime(m, slot, NonZeroTime(m->timenow));
- m->rec.r.resrec.RecordType = 0; // Clear RecordType to show we're not still using it
- // MUST NOT touch m->CurrentQuestion (or q) after this -- client callback could have deleted it
- }
- }
- }
-
-mDNSexport void CheckNATMappings(mDNS *m)
- {
- mStatus err = mStatus_NoError;
- mDNSBool rfc1918 = mDNSv4AddrIsRFC1918(&m->AdvertisedV4.ip.v4);
- mDNSBool HaveRoutable = !rfc1918 && !mDNSIPv4AddressIsZero(m->AdvertisedV4.ip.v4);
- m->NextScheduledNATOp = m->timenow + 0x3FFFFFFF;
-
- if (HaveRoutable) m->ExternalAddress = m->AdvertisedV4.ip.v4;
-
- if (m->NATTraversals && rfc1918) // Do we need to open NAT-PMP socket to receive multicast announcements from router?
- {
- if (m->NATMcastRecvskt == mDNSNULL) // If we are behind a NAT and the socket hasn't been opened yet, open it
- {
- // we need to log a message if we can't get our socket, but only the first time (after success)
- static mDNSBool needLog = mDNStrue;
- m->NATMcastRecvskt = mDNSPlatformUDPSocket(m, NATPMPAnnouncementPort);
- if (!m->NATMcastRecvskt)
- {
- if (needLog)
- {
- LogMsg("CheckNATMappings: Failed to allocate port 5350 UDP multicast socket for NAT-PMP announcements");
- needLog = mDNSfalse;
- }
- }
- else
- needLog = mDNStrue;
- }
- }
- else // else, we don't want to listen for announcements, so close them if they're open
- {
- if (m->NATMcastRecvskt) { mDNSPlatformUDPClose(m->NATMcastRecvskt); m->NATMcastRecvskt = mDNSNULL; }
- if (m->SSDPSocket) { debugf("CheckNATMappings destroying SSDPSocket %p", &m->SSDPSocket); mDNSPlatformUDPClose(m->SSDPSocket); m->SSDPSocket = mDNSNULL; }
- }
-
- if (!m->NATTraversals)
- m->retryGetAddr = m->timenow + 0x78000000;
- else
- {
- if (m->timenow - m->retryGetAddr >= 0)
- {
- err = uDNS_SendNATMsg(m, mDNSNULL); // Will also do UPnP discovery for us, if necessary
- if (!err)
- {
- if (m->retryIntervalGetAddr < NATMAP_INIT_RETRY) m->retryIntervalGetAddr = NATMAP_INIT_RETRY;
- else if (m->retryIntervalGetAddr < NATMAP_MAX_RETRY_INTERVAL / 2) m->retryIntervalGetAddr *= 2;
- else m->retryIntervalGetAddr = NATMAP_MAX_RETRY_INTERVAL;
- }
- LogInfo("CheckNATMappings retryGetAddr sent address request err %d interval %d", err, m->retryIntervalGetAddr);
-
- // Always update m->retryGetAddr, even if we fail to send the packet. Otherwise in cases where we can't send the packet
- // (like when we have no active interfaces) we'll spin in an infinite loop repeatedly failing to send the packet
- m->retryGetAddr = m->timenow + m->retryIntervalGetAddr;
- }
- // Even when we didn't send the GetAddr packet, still need to make sure NextScheduledNATOp is set correctly
- if (m->NextScheduledNATOp - m->retryGetAddr > 0)
- m->NextScheduledNATOp = m->retryGetAddr;
- }
-
- if (m->CurrentNATTraversal) LogMsg("WARNING m->CurrentNATTraversal already in use");
- m->CurrentNATTraversal = m->NATTraversals;
-
- while (m->CurrentNATTraversal)
- {
- NATTraversalInfo *cur = m->CurrentNATTraversal;
- m->CurrentNATTraversal = m->CurrentNATTraversal->next;
-
- if (HaveRoutable) // If not RFC 1918 address, our own address and port are effectively our external address and port
- {
- cur->ExpiryTime = 0;
- cur->NewResult = mStatus_NoError;
- }
- else if (cur->Protocol) // Check if it's time to send port mapping packets
- {
- if (m->timenow - cur->retryPortMap >= 0) // Time to do something with this mapping
- {
- if (cur->ExpiryTime && cur->ExpiryTime - m->timenow < 0) // Mapping has expired
- {
- cur->ExpiryTime = 0;
- cur->retryInterval = NATMAP_INIT_RETRY;
- }
-
- //LogMsg("uDNS_SendNATMsg");
- err = uDNS_SendNATMsg(m, cur);
-
- if (cur->ExpiryTime) // If have active mapping then set next renewal time halfway to expiry
- NATSetNextRenewalTime(m, cur);
- else // else no mapping; use exponential backoff sequence
- {
- if (cur->retryInterval < NATMAP_INIT_RETRY ) cur->retryInterval = NATMAP_INIT_RETRY;
- else if (cur->retryInterval < NATMAP_MAX_RETRY_INTERVAL / 2) cur->retryInterval *= 2;
- else cur->retryInterval = NATMAP_MAX_RETRY_INTERVAL;
- cur->retryPortMap = m->timenow + cur->retryInterval;
- }
- }
-
- if (m->NextScheduledNATOp - cur->retryPortMap > 0)
- m->NextScheduledNATOp = cur->retryPortMap;
- }
-
- // Notify the client if necessary. We invoke the callback if:
- // (1) we have an ExternalAddress, or we've tried and failed a couple of times to discover it
- // and (2) the client doesn't want a mapping, or the client won't need a mapping, or the client has a successful mapping, or we've tried and failed a couple of times
- // and (3) we have new data to give the client that's changed since the last callback
- // Time line is: Send, Wait 500ms, Send, Wait 1sec, Send, Wait 2sec, Send
- // At this point we've sent three requests without an answer, we've just sent our fourth request,
- // retryIntervalGetAddr is now 4 seconds, which is greater than NATMAP_INIT_RETRY * 8 (2 seconds),
- // so we return an error result to the caller.
- if (!mDNSIPv4AddressIsZero(m->ExternalAddress) || m->retryIntervalGetAddr > NATMAP_INIT_RETRY * 8)
- {
- const mStatus EffectiveResult = cur->NewResult ? cur->NewResult : mDNSv4AddrIsRFC1918(&m->ExternalAddress) ? mStatus_DoubleNAT : mStatus_NoError;
- const mDNSIPPort ExternalPort = HaveRoutable ? cur->IntPort :
- !mDNSIPv4AddressIsZero(m->ExternalAddress) && cur->ExpiryTime ? cur->RequestedPort : zeroIPPort;
- if (!cur->Protocol || HaveRoutable || cur->ExpiryTime || cur->retryInterval > NATMAP_INIT_RETRY * 8)
- if (!mDNSSameIPv4Address(cur->ExternalAddress, m->ExternalAddress) ||
- !mDNSSameIPPort (cur->ExternalPort, ExternalPort) ||
- cur->Result != EffectiveResult)
- {
- //LogMsg("NAT callback %d %d %d", cur->Protocol, cur->ExpiryTime, cur->retryInterval);
- if (cur->Protocol && mDNSIPPortIsZero(ExternalPort) && !mDNSIPv4AddressIsZero(m->Router.ip.v4))
- {
- if (!EffectiveResult)
- LogInfo("CheckNATMapping: Failed to obtain NAT port mapping %p from router %#a external address %.4a internal port %5d interval %d error %d",
- cur, &m->Router, &m->ExternalAddress, mDNSVal16(cur->IntPort), cur->retryInterval, EffectiveResult);
- else
- LogMsg("CheckNATMapping: Failed to obtain NAT port mapping %p from router %#a external address %.4a internal port %5d interval %d error %d",
- cur, &m->Router, &m->ExternalAddress, mDNSVal16(cur->IntPort), cur->retryInterval, EffectiveResult);
- }
-
- cur->ExternalAddress = m->ExternalAddress;
- cur->ExternalPort = ExternalPort;
- cur->Lifetime = cur->ExpiryTime && !mDNSIPPortIsZero(ExternalPort) ?
- (cur->ExpiryTime - m->timenow + mDNSPlatformOneSecond/2) / mDNSPlatformOneSecond : 0;
- cur->Result = EffectiveResult;
- mDNS_DropLockBeforeCallback(); // Allow client to legally make mDNS API calls from the callback
- if (cur->clientCallback)
- cur->clientCallback(m, cur);
- mDNS_ReclaimLockAfterCallback(); // Decrement mDNS_reentrancy to block mDNS API calls again
- // MUST NOT touch cur after invoking the callback
- }
- }
- }
- }
-
-mDNSlocal mDNSs32 CheckRecordUpdates(mDNS *m)
- {
- AuthRecord *rr;
- mDNSs32 nextevent = m->timenow + 0x3FFFFFFF;
-
- CheckGroupRecordUpdates(m);
-
- for (rr = m->ResourceRecords; rr; rr = rr->next)
- {
- if (!AuthRecord_uDNS(rr)) continue;
- if (rr->state == regState_NoTarget) {debugf("CheckRecordUpdates: Record %##s in NoTarget", rr->resrec.name->c); continue;}
- // While we are waiting for the port mapping, we have nothing to do. The port mapping callback
- // will take care of this
- if (rr->state == regState_NATMap) {debugf("CheckRecordUpdates: Record %##s in NATMap", rr->resrec.name->c); continue;}
- if (rr->state == regState_Pending || rr->state == regState_DeregPending || rr->state == regState_UpdatePending ||
- rr->state == regState_Refresh || rr->state == regState_Registered)
- {
- if (rr->LastAPTime + rr->ThisAPInterval - m->timenow <= 0)
- {
- if (rr->tcp) { DisposeTCPConn(rr->tcp); rr->tcp = mDNSNULL; }
- if (!rr->nta || mDNSIPv4AddressIsZero(rr->nta->Addr.ip.v4))
- {
- // Zero out the updateid so that if we have a pending response from the server, it won't
- // be accepted as a valid response. If we accept the response, we might free the new "nta"
- if (rr->nta) { rr->updateid = zeroID; CancelGetZoneData(m, rr->nta); }
- rr->nta = StartGetZoneData(m, rr->resrec.name, ZoneServiceUpdate, RecordRegistrationGotZoneData, rr);
-
- // We have just started the GetZoneData. We need to wait for it to finish. SetRecordRetry here
- // schedules the update timer to fire in the future.
- //
- // There are three cases.
- //
- // 1) When the updates are sent the first time, the first retry is intended to be at three seconds
- // in the future. But by calling SetRecordRetry here we set it to nine seconds. But it does not
- // matter because when the answer comes back, RecordRegistrationGotZoneData resets the interval
- // back to INIT_RECORD_REG_INTERVAL. This also gives enough time for the query.
- //
- // 2) In the case of update errors (updateError), this causes further backoff as
- // RecordRegistrationGotZoneData does not reset the timer. This is intentional as in the case of
- // errors, we don't want to update aggressively.
- //
- // 3) We might be refreshing the update. This is very similar to case (1). RecordRegistrationGotZoneData
- // resets it back to INIT_RECORD_REG_INTERVAL.
- //
- SetRecordRetry(m, rr, 0);
- }
- else if (rr->state == regState_DeregPending) SendRecordDeregistration(m, rr);
- else SendRecordRegistration(m, rr);
- }
- }
- if (nextevent - (rr->LastAPTime + rr->ThisAPInterval) > 0)
- nextevent = (rr->LastAPTime + rr->ThisAPInterval);
- }
- return nextevent;
- }
-
-mDNSexport void uDNS_Tasks(mDNS *const m)
- {
- mDNSs32 nexte;
- DNSServer *d;
-
- m->NextuDNSEvent = m->timenow + 0x3FFFFFFF;
-
- nexte = CheckRecordUpdates(m);
- if (m->NextuDNSEvent - nexte > 0)
- m->NextuDNSEvent = nexte;
-
- for (d = m->DNSServers; d; d=d->next)
- if (d->penaltyTime)
- {
- if (m->timenow - d->penaltyTime >= 0)
- {
- LogInfo("DNS server %#a:%d out of penalty box", &d->addr, mDNSVal16(d->port));
- d->penaltyTime = 0;
- }
- else
- if (m->NextuDNSEvent - d->penaltyTime > 0)
- m->NextuDNSEvent = d->penaltyTime;
- }
-
- if (m->CurrentQuestion)
- LogMsg("uDNS_Tasks ERROR m->CurrentQuestion already set: %##s (%s)", m->CurrentQuestion->qname.c, DNSTypeName(m->CurrentQuestion->qtype));
- m->CurrentQuestion = m->Questions;
- while (m->CurrentQuestion && m->CurrentQuestion != m->NewQuestions)
- {
- DNSQuestion *const q = m->CurrentQuestion;
- if (ActiveQuestion(q) && !mDNSOpaque16IsZero(q->TargetQID))
- {
- uDNS_CheckCurrentQuestion(m);
- if (q == m->CurrentQuestion)
- if (m->NextuDNSEvent - NextQSendTime(q) > 0)
- m->NextuDNSEvent = NextQSendTime(q);
- }
- // If m->CurrentQuestion wasn't modified out from under us, advance it now
- // We can't do this at the start of the loop because uDNS_CheckCurrentQuestion()
- // depends on having m->CurrentQuestion point to the right question
- if (m->CurrentQuestion == q)
- m->CurrentQuestion = q->next;
- }
- m->CurrentQuestion = mDNSNULL;
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark - Startup, Shutdown, and Sleep
-#endif
-
-mDNSexport void SleepRecordRegistrations(mDNS *m)
- {
- AuthRecord *rr;
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- {
- if (AuthRecord_uDNS(rr))
- {
- // Zero out the updateid so that if we have a pending response from the server, it won't
- // be accepted as a valid response.
- if (rr->nta) { rr->updateid = zeroID; CancelGetZoneData(m, rr->nta); rr->nta = mDNSNULL; }
-
- if (rr->NATinfo.clientContext)
- {
- mDNS_StopNATOperation_internal(m, &rr->NATinfo);
- rr->NATinfo.clientContext = mDNSNULL;
- }
- // We are waiting to update the resource record. The original data of the record is
- // in OrigRData and the updated value is in InFlightRData. Free the old and the new
- // one will be registered when we come back.
- if (rr->state == regState_UpdatePending)
- {
- // act as if the update succeeded, since we're about to delete the name anyway
- rr->state = regState_Registered;
- // deallocate old RData
- if (rr->UpdateCallback) rr->UpdateCallback(m, rr, rr->OrigRData, rr->OrigRDLen);
- SetNewRData(&rr->resrec, rr->InFlightRData, rr->InFlightRDLen);
- rr->OrigRData = mDNSNULL;
- rr->InFlightRData = mDNSNULL;
- }
-
- // If we have not begun the registration process i.e., never sent a registration packet,
- // then uDNS_DeregisterRecord will not send a deregistration
- uDNS_DeregisterRecord(m, rr);
-
- // When we wake, we call ActivateUnicastRegistration which starts at StartGetZoneData
- }
- }
- }
-
-mDNSexport void mDNS_AddSearchDomain(const domainname *const domain, mDNSInterfaceID InterfaceID)
- {
- SearchListElem **p;
- SearchListElem *tmp = mDNSNULL;
-
- // Check to see if we already have this domain in our list
- for (p = &SearchList; *p; p = &(*p)->next)
- if (((*p)->InterfaceID == InterfaceID) && SameDomainName(&(*p)->domain, domain))
- {
- // If domain is already in list, and marked for deletion, unmark the delete
- // Be careful not to touch the other flags that may be present
- LogInfo("mDNS_AddSearchDomain already in list %##s", domain->c);
- if ((*p)->flag & SLE_DELETE) (*p)->flag &= ~SLE_DELETE;
- tmp = *p;
- *p = tmp->next;
- tmp->next = mDNSNULL;
- break;
- }
-
-
- // move to end of list so that we maintain the same order
- while (*p) p = &(*p)->next;
-
- if (tmp) *p = tmp;
- else
- {
- // if domain not in list, add to list, mark as add (1)
- *p = mDNSPlatformMemAllocate(sizeof(SearchListElem));
- if (!*p) { LogMsg("ERROR: mDNS_AddSearchDomain - malloc"); return; }
- mDNSPlatformMemZero(*p, sizeof(SearchListElem));
- AssignDomainName(&(*p)->domain, domain);
- (*p)->next = mDNSNULL;
- (*p)->InterfaceID = InterfaceID;
- LogInfo("mDNS_AddSearchDomain created new %##s, InterfaceID %p", domain->c, InterfaceID);
- }
- }
-
-mDNSlocal void FreeARElemCallback(mDNS *const m, AuthRecord *const rr, mStatus result)
- {
- (void)m; // unused
- if (result == mStatus_MemFree) mDNSPlatformMemFree(rr->RecordContext);
- }
-
-mDNSlocal void FoundDomain(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord)
- {
- SearchListElem *slElem = question->QuestionContext;
- mStatus err;
- const char *name;
-
- if (answer->rrtype != kDNSType_PTR) return;
- if (answer->RecordType == kDNSRecordTypePacketNegative) return;
- if (answer->InterfaceID == mDNSInterface_LocalOnly) return;
-
- if (question == &slElem->BrowseQ) name = mDNS_DomainTypeNames[mDNS_DomainTypeBrowse];
- else if (question == &slElem->DefBrowseQ) name = mDNS_DomainTypeNames[mDNS_DomainTypeBrowseDefault];
- else if (question == &slElem->AutomaticBrowseQ) name = mDNS_DomainTypeNames[mDNS_DomainTypeBrowseAutomatic];
- else if (question == &slElem->RegisterQ) name = mDNS_DomainTypeNames[mDNS_DomainTypeRegistration];
- else if (question == &slElem->DefRegisterQ) name = mDNS_DomainTypeNames[mDNS_DomainTypeRegistrationDefault];
- else { LogMsg("FoundDomain - unknown question"); return; }
-
- LogInfo("FoundDomain: %p %s %s Q %##s A %s", answer->InterfaceID, AddRecord ? "Add" : "Rmv", name, question->qname.c, RRDisplayString(m, answer));
-
- if (AddRecord)
- {
- ARListElem *arElem = mDNSPlatformMemAllocate(sizeof(ARListElem));
- if (!arElem) { LogMsg("ERROR: FoundDomain out of memory"); return; }
- mDNS_SetupResourceRecord(&arElem->ar, mDNSNULL, mDNSInterface_LocalOnly, kDNSType_PTR, 7200, kDNSRecordTypeShared, AuthRecordLocalOnly, FreeARElemCallback, arElem);
- MakeDomainNameFromDNSNameString(&arElem->ar.namestorage, name);
- AppendDNSNameString (&arElem->ar.namestorage, "local");
- AssignDomainName(&arElem->ar.resrec.rdata->u.name, &answer->rdata->u.name);
- LogInfo("FoundDomain: Registering %s", ARDisplayString(m, &arElem->ar));
- err = mDNS_Register(m, &arElem->ar);
- if (err) { LogMsg("ERROR: FoundDomain - mDNS_Register returned %d", err); mDNSPlatformMemFree(arElem); return; }
- arElem->next = slElem->AuthRecs;
- slElem->AuthRecs = arElem;
- }
- else
- {
- ARListElem **ptr = &slElem->AuthRecs;
- while (*ptr)
- {
- if (SameDomainName(&(*ptr)->ar.resrec.rdata->u.name, &answer->rdata->u.name))
- {
- ARListElem *dereg = *ptr;
- *ptr = (*ptr)->next;
- LogInfo("FoundDomain: Deregistering %s", ARDisplayString(m, &dereg->ar));
- err = mDNS_Deregister(m, &dereg->ar);
- if (err) LogMsg("ERROR: FoundDomain - mDNS_Deregister returned %d", err);
- // Memory will be freed in the FreeARElemCallback
- }
- else
- ptr = &(*ptr)->next;
- }
- }
- }
-
-#if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING
-mDNSexport void udns_validatelists(void *const v)
- {
- mDNS *const m = v;
-
- NATTraversalInfo *n;
- for (n = m->NATTraversals; n; n=n->next)
- if (n->next == (NATTraversalInfo *)~0 || n->clientCallback == (NATTraversalClientCallback)~0)
- LogMemCorruption("m->NATTraversals: %p is garbage", n);
-
- DNSServer *d;
- for (d = m->DNSServers; d; d=d->next)
- if (d->next == (DNSServer *)~0 || d->teststate > DNSServer_Disabled)
- LogMemCorruption("m->DNSServers: %p is garbage (%d)", d, d->teststate);
-
- DomainAuthInfo *info;
- for (info = m->AuthInfoList; info; info = info->next)
- if (info->next == (DomainAuthInfo *)~0 || info->AutoTunnel == (const char*)~0)
- LogMemCorruption("m->AuthInfoList: %p is garbage (%X)", info, info->AutoTunnel);
-
- HostnameInfo *hi;
- for (hi = m->Hostnames; hi; hi = hi->next)
- if (hi->next == (HostnameInfo *)~0 || hi->StatusCallback == (mDNSRecordCallback*)~0)
- LogMemCorruption("m->Hostnames: %p is garbage", n);
-
- SearchListElem *ptr;
- for (ptr = SearchList; ptr; ptr = ptr->next)
- if (ptr->next == (SearchListElem *)~0 || ptr->AuthRecs == (void*)~0)
- LogMemCorruption("SearchList: %p is garbage (%X)", ptr, ptr->AuthRecs);
- }
-#endif
-
-// This should probably move to the UDS daemon -- the concept of legacy clients and automatic registration / automatic browsing
-// is really a UDS API issue, not something intrinsic to uDNS
-
-mDNSexport mStatus uDNS_SetupSearchDomains(mDNS *const m, int action)
- {
- SearchListElem **p = &SearchList, *ptr;
- mStatus err;
-
- // step 1: mark each element for removal
- for (ptr = SearchList; ptr; ptr = ptr->next) ptr->flag |= SLE_DELETE;
-
- // Make sure we have the search domains from the platform layer so that if we start the WAB
- // queries below, we have the latest information
- mDNS_Lock(m);
- mDNSPlatformSetDNSConfig(m, mDNSfalse, mDNStrue, mDNSNULL, mDNSNULL, mDNSNULL);
- mDNS_Unlock(m);
-
- if (action & UDNS_START_WAB_QUERY)
- m->StartWABQueries = mDNStrue;
-
- // delete elems marked for removal, do queries for elems marked add
- while (*p)
- {
- ptr = *p;
- LogInfo("uDNS_SetupSearchDomains:action %d: Flags %d, AuthRecs %p, InterfaceID %p %##s", action, ptr->flag, ptr->AuthRecs, ptr->InterfaceID, ptr->domain.c);
- if (ptr->flag & SLE_DELETE)
- {
- ARListElem *arList = ptr->AuthRecs;
- ptr->AuthRecs = mDNSNULL;
- *p = ptr->next;
-
- // If the user has "local" in their DNS searchlist, we ignore that for the purposes of domain enumeration queries
- // We suppressed the domain enumeration for scoped search domains below. When we enable that
- // enable this.
- if ((ptr->flag & SLE_WAB_QUERY_STARTED) &&
- !SameDomainName(&ptr->domain, &localdomain) && (ptr->InterfaceID == mDNSInterface_Any))
- {
- mDNS_StopGetDomains(m, &ptr->BrowseQ);
- mDNS_StopGetDomains(m, &ptr->RegisterQ);
- mDNS_StopGetDomains(m, &ptr->DefBrowseQ);
- mDNS_StopGetDomains(m, &ptr->DefRegisterQ);
- mDNS_StopGetDomains(m, &ptr->AutomaticBrowseQ);
- }
-
- mDNSPlatformMemFree(ptr);
-
- // deregister records generated from answers to the query
- while (arList)
- {
- ARListElem *dereg = arList;
- arList = arList->next;
- debugf("Deregistering PTR %##s -> %##s", dereg->ar.resrec.name->c, dereg->ar.resrec.rdata->u.name.c);
- err = mDNS_Deregister(m, &dereg->ar);
- if (err) LogMsg("uDNS_SetupSearchDomains:: ERROR!! mDNS_Deregister returned %d", err);
- // Memory will be freed in the FreeARElemCallback
- }
- continue;
- }
-
- if ((action & UDNS_START_WAB_QUERY) && !(ptr->flag & SLE_WAB_QUERY_STARTED))
- {
- // If the user has "local" in their DNS searchlist, we ignore that for the purposes of domain enumeration queries.
- // Also, suppress the domain enumeration for scoped search domains for now until there is a need.
- if (!SameDomainName(&ptr->domain, &localdomain) && (ptr->InterfaceID == mDNSInterface_Any))
- {
- mStatus err1, err2, err3, err4, err5;
- err1 = mDNS_GetDomains(m, &ptr->BrowseQ, mDNS_DomainTypeBrowse, &ptr->domain, ptr->InterfaceID, FoundDomain, ptr);
- err2 = mDNS_GetDomains(m, &ptr->DefBrowseQ, mDNS_DomainTypeBrowseDefault, &ptr->domain, ptr->InterfaceID, FoundDomain, ptr);
- err3 = mDNS_GetDomains(m, &ptr->RegisterQ, mDNS_DomainTypeRegistration, &ptr->domain, ptr->InterfaceID, FoundDomain, ptr);
- err4 = mDNS_GetDomains(m, &ptr->DefRegisterQ, mDNS_DomainTypeRegistrationDefault, &ptr->domain, ptr->InterfaceID, FoundDomain, ptr);
- err5 = mDNS_GetDomains(m, &ptr->AutomaticBrowseQ, mDNS_DomainTypeBrowseAutomatic, &ptr->domain, ptr->InterfaceID, FoundDomain, ptr);
- if (err1 || err2 || err3 || err4 || err5)
- LogMsg("uDNS_SetupSearchDomains: GetDomains for domain %##s returned error(s):\n"
- "%d (mDNS_DomainTypeBrowse)\n"
- "%d (mDNS_DomainTypeBrowseDefault)\n"
- "%d (mDNS_DomainTypeRegistration)\n"
- "%d (mDNS_DomainTypeRegistrationDefault)"
- "%d (mDNS_DomainTypeBrowseAutomatic)\n",
- ptr->domain.c, err1, err2, err3, err4, err5);
- ptr->flag |= SLE_WAB_QUERY_STARTED;
- }
- }
-
- p = &ptr->next;
- }
- return mStatus_NoError;
- }
-
-mDNSexport domainname *uDNS_GetNextSearchDomain(mDNS *const m, mDNSInterfaceID InterfaceID, mDNSs8 *searchIndex, mDNSBool ignoreDotLocal)
- {
- SearchListElem *p = SearchList;
- int count = *searchIndex;
- (void) m; // unused
-
- if (count < 0) { LogMsg("uDNS_GetNextSearchDomain: count %d less than zero", count); return mDNSNULL; }
-
- // skip the domains that we already looked at before
- for (; count; count--) p = p->next;
-
- while (p)
- {
- int labels = CountLabels(&p->domain);
- if (labels > 0)
- {
- const domainname *d = SkipLeadingLabels(&p->domain, labels - 1);
- if (SameDomainLabel(d->c, (const mDNSu8 *)"\x4""arpa"))
- {
- LogInfo("uDNS_GetNextSearchDomain: skipping search domain %##s, InterfaceID %p", p->domain.c, p->InterfaceID);
- (*searchIndex)++;
- p = p->next;
- continue;
- }
- if (ignoreDotLocal && SameDomainLabel(d->c, (const mDNSu8 *)"\x5""local"))
- {
- LogInfo("uDNS_GetNextSearchDomain: skipping local domain %##s, InterfaceID %p", p->domain.c, p->InterfaceID);
- (*searchIndex)++;
- p = p->next;
- continue;
- }
- }
- // Point to the next one in the list which we will look at next time.
- (*searchIndex)++;
- // When we are appending search domains in a ActiveDirectory domain, the question's InterfaceID
- // set to mDNSInterface_Unicast. Match the unscoped entries in that case.
- if (((InterfaceID == mDNSInterface_Unicast) && (p->InterfaceID == mDNSInterface_Any)) ||
- p->InterfaceID == InterfaceID)
- {
- LogInfo("uDNS_GetNextSearchDomain returning domain %##s, InterfaceID %p", p->domain.c, p->InterfaceID);
- return &p->domain;
- }
- LogInfo("uDNS_GetNextSearchDomain skipping domain %##s, InterfaceID %p", p->domain.c, p->InterfaceID);
- p = p->next;
- }
- return mDNSNULL;
- }
-
-mDNSlocal void FlushAddressCacheRecords(mDNS *const m)
- {
- mDNSu32 slot;
- CacheGroup *cg;
- CacheRecord *cr;
- FORALL_CACHERECORDS(slot, cg, cr)
- {
- if (cr->resrec.InterfaceID) continue;
-
- // If a resource record can answer A or AAAA, they need to be flushed so that we will
- // never used to deliver an ADD or RMV
- if (RRTypeAnswersQuestionType(&cr->resrec, kDNSType_A) ||
- RRTypeAnswersQuestionType(&cr->resrec, kDNSType_AAAA))
- {
- LogInfo("FlushAddressCacheRecords: Purging Resourcerecord %s", CRDisplayString(m, cr));
- mDNS_PurgeCacheResourceRecord(m, cr);
- }
- }
- }
-
-// Retry questions which has seach domains appended
-mDNSexport void RetrySearchDomainQuestions(mDNS *const m)
- {
- // Purge all the A/AAAA cache records and restart the queries. mDNSCoreRestartAddressQueries
- // does this. When we restart the question, we first want to try the new search domains rather
- // than use the entries that is already in the cache. When we appended search domains, we might
- // have created cache entries which is no longer valid as there are new search domains now
-
- LogInfo("RetrySearchDomainQuestions: Calling mDNSCoreRestartAddressQueries");
- mDNSCoreRestartAddressQueries(m, mDNStrue, FlushAddressCacheRecords, mDNSNULL, mDNSNULL);
- }
-
-// Construction of Default Browse domain list (i.e. when clients pass NULL) is as follows:
-// 1) query for b._dns-sd._udp.local on LocalOnly interface
-// (.local manually generated via explicit callback)
-// 2) for each search domain (from prefs pane), query for b._dns-sd._udp.<searchdomain>.
-// 3) for each result from (2), register LocalOnly PTR record b._dns-sd._udp.local. -> <result>
-// 4) result above should generate a callback from question in (1). result added to global list
-// 5) global list delivered to client via GetSearchDomainList()
-// 6) client calls to enumerate domains now go over LocalOnly interface
-// (!!!KRS may add outgoing interface in addition)
-
-struct CompileTimeAssertionChecks_uDNS
- {
- // Check our structures are reasonable sizes. Including overly-large buffers, or embedding
- // other overly-large structures instead of having a pointer to them, can inadvertently
- // cause structure sizes (and therefore memory usage) to balloon unreasonably.
- char sizecheck_tcpInfo_t [(sizeof(tcpInfo_t) <= 9056) ? 1 : -1];
- char sizecheck_SearchListElem[(sizeof(SearchListElem) <= 5000) ? 1 : -1];
- };
diff --git a/src/tools/mdnssd/uDNS.h b/src/tools/mdnssd/uDNS.h
deleted file mode 100755
index 8e46ffa77d4..00000000000
--- a/src/tools/mdnssd/uDNS.h
+++ /dev/null
@@ -1,136 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef __UDNS_H_
-#define __UDNS_H_
-
-#include "mDNSEmbeddedAPI.h"
-#include "DNSCommon.h"
-
-#ifdef __cplusplus
- extern "C" {
-#endif
-
-#define RESTART_GOODBYE_DELAY (6 * mDNSPlatformOneSecond) // delay after restarting LLQ before nuking previous known answers (avoids flutter if we restart before we have networking up)
-#define INIT_UCAST_POLL_INTERVAL (3 * mDNSPlatformOneSecond) // this interval is used after send failures on network transitions
- // which typically heal quickly, so we start agressively and exponentially back off
-#define MAX_UCAST_POLL_INTERVAL (60 * 60 * mDNSPlatformOneSecond)
-//#define MAX_UCAST_POLL_INTERVAL (1 * 60 * mDNSPlatformOneSecond)
-#define LLQ_POLL_INTERVAL (15 * 60 * mDNSPlatformOneSecond) // Polling interval for zones w/ an advertised LLQ port (ie not static zones) if LLQ fails due to NAT, etc.
-#define RESPONSE_WINDOW (60 * mDNSPlatformOneSecond) // require server responses within one minute of request
-#define MAX_UCAST_UNANSWERED_QUERIES 2 // the number of unanswered queries from any one uDNS server before trying another server
-#define DNSSERVER_PENALTY_TIME (60 * mDNSPlatformOneSecond) // number of seconds for which new questions don't pick this server
-
-// On some interfaces, we want to delay the first retransmission to a minimum of 2 seconds
-// rather than the default (1 second).
-#define MIN_UCAST_RETRANS_TIMEOUT (2 * mDNSPlatformOneSecond)
-
-#define DEFAULT_UPDATE_LEASE 7200
-
-#define QuestionIntervalStep 3
-#define QuestionIntervalStep2 (QuestionIntervalStep*QuestionIntervalStep)
-#define QuestionIntervalStep3 (QuestionIntervalStep*QuestionIntervalStep*QuestionIntervalStep)
-#define InitialQuestionInterval ((mDNSPlatformOneSecond + QuestionIntervalStep-1) / QuestionIntervalStep)
-
-// For Unicast record registrations, we initialize the interval to 1 second. When we send any query for
-// the record registration e.g., GetZoneData, we always back off by QuestionIntervalStep
-// so that the first retry does not happen until 3 seconds which should be enough for TCP/TLS to be done.
-#define INIT_RECORD_REG_INTERVAL (1 * mDNSPlatformOneSecond)
-#define MAX_RECORD_REG_INTERVAL (15 * 60 * mDNSPlatformOneSecond)
-#define MERGE_DELAY_TIME (1 * mDNSPlatformOneSecond)
-
-// If we are refreshing, we do it at least 5 times with a min update frequency of
-// 5 minutes
-#define MAX_UPDATE_REFRESH_COUNT 5
-#define MIN_UPDATE_REFRESH_TIME (5 * 60 * mDNSPlatformOneSecond)
-
-// For questions that use kDNSServiceFlagsTimeout and we don't have a matching resolver e.g., no dns servers,
-// then use the default value of 30 seconds
-#define DEFAULT_UDNS_TIMEOUT 30 // in seconds
-
-// Entry points into unicast-specific routines
-
-extern void LLQGotZoneData(mDNS *const m, mStatus err, const ZoneData *zoneInfo);
-extern void startLLQHandshake(mDNS *m, DNSQuestion *q);
-extern void sendLLQRefresh(mDNS *m, DNSQuestion *q);
-
-extern void SleepRecordRegistrations(mDNS *m);
-
-// uDNS_UpdateRecord
-// following fields must be set, and the update validated, upon entry.
-// rr->NewRData
-// rr->newrdlength
-// rr->UpdateCallback
-
-extern mStatus uDNS_UpdateRecord(mDNS *m, AuthRecord *rr);
-
-extern void SetNextQueryTime(mDNS *const m, const DNSQuestion *const q);
-extern CacheGroup *CacheGroupForName(const mDNS *const m, const mDNSu32 slot, const mDNSu32 namehash, const domainname *const name);
-extern mStatus mDNS_Register_internal(mDNS *const m, AuthRecord *const rr);
-extern mStatus mDNS_Deregister_internal(mDNS *const m, AuthRecord *const rr, mDNS_Dereg_type drt);
-extern mStatus mDNS_StartQuery_internal(mDNS *const m, DNSQuestion *const question);
-extern mStatus mDNS_StopQuery_internal(mDNS *const m, DNSQuestion *const question);
-extern mStatus mDNS_StartNATOperation_internal(mDNS *const m, NATTraversalInfo *traversal);
-
-extern void RecordRegistrationGotZoneData(mDNS *const m, mStatus err, const ZoneData *zoneData);
-extern mStatus uDNS_DeregisterRecord(mDNS *const m, AuthRecord *const rr);
-extern const domainname *GetServiceTarget(mDNS *m, AuthRecord *const rr);
-extern void uDNS_CheckCurrentQuestion(mDNS *const m);
-
-// integer fields of msg header must be in HOST byte order before calling this routine
-extern void uDNS_ReceiveMsg(mDNS *const m, DNSMessage *const msg, const mDNSu8 *const end,
- const mDNSAddr *const srcaddr, const mDNSIPPort srcport);
-
-extern void uDNS_Tasks(mDNS *const m);
-extern void UpdateAllSRVRecords(mDNS *m);
-extern void CheckNATMappings(mDNS *m);
-
-extern mStatus uDNS_SetupDNSConfig(mDNS *const m);
-
-// uDNS_SetupSearchDomains by default adds search domains. It also can be called with one or
-// more values for "action" which does the following:
-//
-// -UDNS_START_WAB_QUERY - start Wide Area Bonjour (domain enumeration) queries
-
-#define UDNS_START_WAB_QUERY 0x00000001
-
-extern mStatus uDNS_SetupSearchDomains(mDNS *const m, int action);
-extern domainname *uDNS_GetNextSearchDomain(mDNS *const m, mDNSInterfaceID InterfaceID, mDNSs8 *searchIndex, mDNSBool ignoreDotLocal);
-
-typedef enum
- {
- uDNS_LLQ_Not = 0, // Normal uDNS answer: Flush any stale records from cache, and respect record TTL
- uDNS_LLQ_Ignore, // LLQ initial challenge packet: ignore -- has no useful records for us
- uDNS_LLQ_Entire, // LLQ initial set of answers: Flush any stale records from cache, but assume TTL is 2 x LLQ refresh interval
- uDNS_LLQ_Events // LLQ event packet: don't flush cache; assume TTL is 2 x LLQ refresh interval
- } uDNS_LLQType;
-
-extern uDNS_LLQType uDNS_recvLLQResponse(mDNS *const m, const DNSMessage *const msg, const mDNSu8 *const end, const mDNSAddr *const srcaddr, const mDNSIPPort srcport, DNSQuestion **matchQuestion);
-extern DomainAuthInfo *GetAuthInfoForName_internal(mDNS *m, const domainname *const name);
-extern DomainAuthInfo *GetAuthInfoForQuestion(mDNS *m, const DNSQuestion *const q);
-extern void DisposeTCPConn(struct tcpInfo_t *tcp);
-
-// NAT traversal
-extern void uDNS_ReceiveNATPMPPacket(mDNS *m, const mDNSInterfaceID InterfaceID, mDNSu8 *pkt, mDNSu16 len); // Called for each received NAT-PMP packet
-extern void natTraversalHandleAddressReply(mDNS *const m, mDNSu16 err, mDNSv4Addr ExtAddr);
-extern void natTraversalHandlePortMapReply(mDNS *const m, NATTraversalInfo *n, const mDNSInterfaceID InterfaceID, mDNSu16 err, mDNSIPPort extport, mDNSu32 lease);
-
-#ifdef __cplusplus
- }
-#endif
-
-#endif // __UDNS_H_
diff --git a/src/tools/mdnssd/uds_daemon.c b/src/tools/mdnssd/uds_daemon.c
deleted file mode 100644
index c962173498e..00000000000
--- a/src/tools/mdnssd/uds_daemon.c
+++ /dev/null
@@ -1,4716 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2003-2006 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#if defined(_WIN32)
-#include <process.h>
-#define usleep(X) Sleep(((X)+999)/1000)
-#else
-#include <fcntl.h>
-#include <errno.h>
-#include <sys/ioctl.h>
-#include <sys/types.h>
-#include <sys/time.h>
-#include <sys/resource.h>
-#endif
-
-#include <stdlib.h>
-#include <stdio.h>
-
-#include "mDNSEmbeddedAPI.h"
-#include "DNSCommon.h"
-#include "uDNS.h"
-#include "uds_daemon.h"
-
-// Normally we append search domains only for queries with a single label that are not
-// fully qualified. This can be overridden to apply search domains for queries (that are
-// not fully qualified) with any number of labels e.g., moon, moon.cs, moon.cs.be, etc.
-mDNSBool AlwaysAppendSearchDomains = mDNSfalse;
-
-// Apple-specific functionality, not required for other platforms
-#if APPLE_OSX_mDNSResponder
-#include <sys/ucred.h>
-#ifndef PID_FILE
-#define PID_FILE ""
-#endif
-#endif
-
-#if APPLE_OSX_mDNSResponder
-#include <WebFilterDNS/WebFilterDNS.h>
-
-#if ! NO_WCF
-
-int WCFIsServerRunning(WCFConnection *conn) __attribute__((weak_import));
-int WCFNameResolvesToAddr(WCFConnection *conn, char* domainName, struct sockaddr* address, uid_t userid) __attribute__((weak_import));
-int WCFNameResolvesToName(WCFConnection *conn, char* fromName, char* toName, uid_t userid) __attribute__((weak_import));
-
-// Do we really need to define a macro for "if"?
-#define CHECK_WCF_FUNCTION(X) if (X)
-#endif // ! NO_WCF
-
-#else
-#define NO_WCF 1
-#endif // APPLE_OSX_mDNSResponder
-
-// User IDs 0-500 are system-wide processes, not actual users in the usual sense
-// User IDs for real user accounts start at 501 and count up from there
-#define SystemUID(X) ((X) <= 500)
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - Types and Data Structures
-#endif
-
-typedef enum
- {
- t_uninitialized,
- t_morecoming,
- t_complete,
- t_error,
- t_terminated
- } transfer_state;
-
-typedef struct request_state request_state;
-
-typedef void (*req_termination_fn)(request_state *request);
-
-typedef struct registered_record_entry
- {
- struct registered_record_entry *next;
- mDNSu32 key;
- client_context_t regrec_client_context;
- request_state *request;
- mDNSBool external_advertise;
- mDNSInterfaceID origInterfaceID;
- AuthRecord *rr; // Pointer to variable-sized AuthRecord (Why a pointer? Why not just embed it here?)
- } registered_record_entry;
-
-// A single registered service: ServiceRecordSet + bookkeeping
-// Note that we duplicate some fields from parent service_info object
-// to facilitate cleanup, when instances and parent may be deallocated at different times.
-typedef struct service_instance
- {
- struct service_instance *next;
- request_state *request;
- AuthRecord *subtypes;
- mDNSBool renameonmemfree; // Set on config change when we deregister original name
- mDNSBool clientnotified; // Has client been notified of successful registration yet?
- mDNSBool default_local; // is this the "local." from an empty-string registration?
- mDNSBool external_advertise; // is this is being advertised externally?
- domainname domain;
- ServiceRecordSet srs; // note -- variable-sized object -- must be last field in struct
- } service_instance;
-
-// for multi-domain default browsing
-typedef struct browser_t
- {
- struct browser_t *next;
- domainname domain;
- DNSQuestion q;
- } browser_t;
-
-struct request_state
- {
- request_state *next;
- request_state *primary; // If this operation is on a shared socket, pointer to primary
- // request_state for the original DNSServiceCreateConnection() operation
- dnssd_sock_t sd;
- dnssd_sock_t errsd;
- mDNSu32 uid;
- void * platform_data;
-
- // Note: On a shared connection these fields in the primary structure, including hdr, are re-used
- // for each new request. This is because, until we've read the ipc_msg_hdr to find out what the
- // operation is, we don't know if we're going to need to allocate a new request_state or not.
- transfer_state ts;
- mDNSu32 hdr_bytes; // bytes of header already read
- ipc_msg_hdr hdr;
- mDNSu32 data_bytes; // bytes of message data already read
- char *msgbuf; // pointer to data storage to pass to free()
- const char *msgptr; // pointer to data to be read from (may be modified)
- char *msgend; // pointer to byte after last byte of message
-
- // reply, termination, error, and client context info
- int no_reply; // don't send asynchronous replies to client
- mDNSs32 time_blocked; // record time of a blocked client
- int unresponsiveness_reports;
- struct reply_state *replies; // corresponding (active) reply list
- req_termination_fn terminate;
- DNSServiceFlags flags;
-
- union
- {
- registered_record_entry *reg_recs; // list of registrations for a connection-oriented request
- struct
- {
- mDNSInterfaceID interface_id;
- mDNSBool default_domain;
- mDNSBool ForceMCast;
- domainname regtype;
- browser_t *browsers;
- } browser;
- struct
- {
- mDNSInterfaceID InterfaceID;
- mDNSu16 txtlen;
- void *txtdata;
- mDNSIPPort port;
- domainlabel name;
- char type_as_string[MAX_ESCAPED_DOMAIN_NAME];
- domainname type;
- mDNSBool default_domain;
- domainname host;
- mDNSBool autoname; // Set if this name is tied to the Computer Name
- mDNSBool autorename; // Set if this client wants us to automatically rename on conflict
- mDNSBool allowremotequery; // Respond to unicast queries from outside the local link?
- int num_subtypes;
- service_instance *instances;
- } servicereg;
- struct
- {
- mDNSInterfaceID interface_id;
- mDNSu32 flags;
- mDNSu32 protocol;
- DNSQuestion q4;
- DNSQuestion *q42;
- DNSQuestion q6;
- DNSQuestion *q62;
- } addrinfo;
- struct
- {
- mDNSIPPort ReqExt; // External port we originally requested, for logging purposes
- NATTraversalInfo NATinfo;
- } pm;
- struct
- {
-#if 0
- DNSServiceFlags flags;
-#endif
- DNSQuestion q_all;
- DNSQuestion q_default;
- } enumeration;
- struct
- {
- DNSQuestion q;
- DNSQuestion *q2;
- } queryrecord;
- struct
- {
- DNSQuestion qtxt;
- DNSQuestion qsrv;
- const ResourceRecord *txt;
- const ResourceRecord *srv;
- mDNSs32 ReportTime;
- mDNSBool external_advertise;
- } resolve;
- } u;
- };
-
-// struct physically sits between ipc message header and call-specific fields in the message buffer
-typedef struct
- {
- DNSServiceFlags flags; // Note: This field is in NETWORK byte order
- mDNSu32 ifi; // Note: This field is in NETWORK byte order
- DNSServiceErrorType error; // Note: This field is in NETWORK byte order
- } reply_hdr;
-
-typedef struct reply_state
- {
- struct reply_state *next; // If there are multiple unsent replies
- mDNSu32 totallen;
- mDNSu32 nwriten;
- ipc_msg_hdr mhdr[1];
- reply_hdr rhdr[1];
- } reply_state;
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - Globals
-#endif
-
-// globals
-mDNSexport mDNS mDNSStorage;
-mDNSexport const char ProgramName[] = "mDNSResponder";
-
-static dnssd_sock_t listenfd = dnssd_InvalidSocket;
-static request_state *all_requests = NULL;
-
-// Note asymmetry here between registration and browsing.
-// For service registrations we only automatically register in domains that explicitly appear in local configuration data
-// (so AutoRegistrationDomains could equally well be called SCPrefRegDomains)
-// For service browsing we also learn automatic browsing domains from the network, so for that case we have:
-// 1. SCPrefBrowseDomains (local configuration data)
-// 2. LocalDomainEnumRecords (locally-generated local-only PTR records -- equivalent to slElem->AuthRecs in uDNS.c)
-// 3. AutoBrowseDomains, which is populated by tracking add/rmv events in AutomaticBrowseDomainChange, the callback function for our mDNS_GetDomains call.
-// By creating and removing our own LocalDomainEnumRecords, we trigger AutomaticBrowseDomainChange callbacks just like domains learned from the network would.
-
-mDNSexport DNameListElem *AutoRegistrationDomains; // Domains where we automatically register for empty-string registrations
-
-static DNameListElem *SCPrefBrowseDomains; // List of automatic browsing domains read from SCPreferences for "empty string" browsing
-static ARListElem *LocalDomainEnumRecords; // List of locally-generated PTR records to augment those we learn from the network
-mDNSexport DNameListElem *AutoBrowseDomains; // List created from those local-only PTR records plus records we get from the network
-
-#define MSG_PAD_BYTES 5 // pad message buffer (read from client) with n zero'd bytes to guarantee
- // n get_string() calls w/o buffer overrun
-// initialization, setup/teardown functions
-
-// If a platform specifies its own PID file name, we use that
-#ifndef PID_FILE
-#define PID_FILE "/var/run/mDNSResponder.pid"
-#endif
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - General Utility Functions
-#endif
-
-mDNSlocal void FatalError(char *errmsg)
- {
- LogMsg("%s: %s", errmsg, dnssd_strerror(dnssd_errno));
- *(long*)0 = 0; // On OS X abort() doesn't generate a crash log, but writing to zero does
- abort(); // On platforms where writing to zero doesn't generate an exception, abort instead
- }
-
-mDNSlocal mDNSu32 dnssd_htonl(mDNSu32 l)
- {
- mDNSu32 ret;
- char *data = (char*) &ret;
- put_uint32(l, &data);
- return ret;
- }
-
-// hack to search-replace perror's to LogMsg's
-mDNSlocal void my_perror(char *errmsg)
- {
- LogMsg("%s: %d (%s)", errmsg, dnssd_errno, dnssd_strerror(dnssd_errno));
- }
-
-mDNSlocal void abort_request(request_state *req)
- {
- if (req->terminate == (req_termination_fn)~0)
- { LogMsg("abort_request: ERROR: Attempt to abort operation %p with req->terminate %p", req, req->terminate); return; }
-
- // First stop whatever mDNSCore operation we were doing
- // If this is actually a shared connection operation, then its req->terminate function will scan
- // the all_requests list and terminate any subbordinate operations sharing this file descriptor
- if (req->terminate) req->terminate(req);
-
- if (!dnssd_SocketValid(req->sd))
- { LogMsg("abort_request: ERROR: Attempt to abort operation %p with invalid fd %d", req, req->sd); return; }
-
- // Now, if this request_state is not subordinate to some other primary, close file descriptor and discard replies
- if (!req->primary)
- {
- if (req->errsd != req->sd) LogOperation("%3d: Removing FD and closing errsd %d", req->sd, req->errsd);
- else LogOperation("%3d: Removing FD", req->sd);
- udsSupportRemoveFDFromEventLoop(req->sd, req->platform_data); // Note: This also closes file descriptor req->sd for us
- if (req->errsd != req->sd) { dnssd_close(req->errsd); req->errsd = req->sd; }
-
- while (req->replies) // free pending replies
- {
- reply_state *ptr = req->replies;
- req->replies = req->replies->next;
- freeL("reply_state (abort)", ptr);
- }
- }
-
- // Set req->sd to something invalid, so that udsserver_idle knows to unlink and free this structure
-#if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING
- // Don't use dnssd_InvalidSocket (-1) because that's the sentinel value MACOSX_MDNS_MALLOC_DEBUGGING uses
- // for detecting when the memory for an object is inadvertently freed while the object is still on some list
- req->sd = req->errsd = -2;
-#else
- req->sd = req->errsd = dnssd_InvalidSocket;
-#endif
- // We also set req->terminate to a bogus value so we know if abort_request() gets called again for this request
- req->terminate = (req_termination_fn)~0;
- }
-
-mDNSlocal void AbortUnlinkAndFree(request_state *req)
- {
- request_state **p = &all_requests;
- abort_request(req);
- while (*p && *p != req) p=&(*p)->next;
- if (*p) { *p = req->next; freeL("request_state/AbortUnlinkAndFree", req); }
- else LogMsg("AbortUnlinkAndFree: ERROR: Attempt to abort operation %p not in list", req);
- }
-
-mDNSlocal reply_state *create_reply(const reply_op_t op, const size_t datalen, request_state *const request)
- {
- reply_state *reply;
-
- if ((unsigned)datalen < sizeof(reply_hdr))
- {
- LogMsg("ERROR: create_reply - data length less than length of required fields");
- return NULL;
- }
-
- reply = mallocL("reply_state", sizeof(reply_state) + datalen - sizeof(reply_hdr));
- if (!reply) FatalError("ERROR: malloc");
-
- reply->next = mDNSNULL;
- reply->totallen = (mDNSu32)datalen + sizeof(ipc_msg_hdr);
- reply->nwriten = 0;
-
- reply->mhdr->version = VERSION;
- reply->mhdr->datalen = (mDNSu32)datalen;
- reply->mhdr->ipc_flags = 0;
- reply->mhdr->op = op;
- reply->mhdr->client_context = request->hdr.client_context;
- reply->mhdr->reg_index = 0;
-
- return reply;
- }
-
-// Append a reply to the list in a request object
-// If our request is sharing a connection, then we append our reply_state onto the primary's list
-mDNSlocal void append_reply(request_state *req, reply_state *rep)
- {
- request_state *r = req->primary ? req->primary : req;
- reply_state **ptr = &r->replies;
- while (*ptr) ptr = &(*ptr)->next;
- *ptr = rep;
- rep->next = NULL;
- }
-
-// Generates a response message giving name, type, domain, plus interface index,
-// suitable for a browse result or service registration result.
-// On successful completion rep is set to point to a malloc'd reply_state struct
-mDNSlocal mStatus GenerateNTDResponse(const domainname *const servicename, const mDNSInterfaceID id,
- request_state *const request, reply_state **const rep, reply_op_t op, DNSServiceFlags flags, mStatus err)
- {
- domainlabel name;
- domainname type, dom;
- *rep = NULL;
- if (!DeconstructServiceName(servicename, &name, &type, &dom))
- return kDNSServiceErr_Invalid;
- else
- {
- char namestr[MAX_DOMAIN_LABEL+1];
- char typestr[MAX_ESCAPED_DOMAIN_NAME];
- char domstr [MAX_ESCAPED_DOMAIN_NAME];
- int len;
- char *data;
-
- ConvertDomainLabelToCString_unescaped(&name, namestr);
- ConvertDomainNameToCString(&type, typestr);
- ConvertDomainNameToCString(&dom, domstr);
-
- // Calculate reply data length
- len = sizeof(DNSServiceFlags);
- len += sizeof(mDNSu32); // if index
- len += sizeof(DNSServiceErrorType);
- len += (int) (strlen(namestr) + 1);
- len += (int) (strlen(typestr) + 1);
- len += (int) (strlen(domstr) + 1);
-
- // Build reply header
- *rep = create_reply(op, len, request);
- (*rep)->rhdr->flags = dnssd_htonl(flags);
- (*rep)->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(&mDNSStorage, id, mDNSfalse));
- (*rep)->rhdr->error = dnssd_htonl(err);
-
- // Build reply body
- data = (char *)&(*rep)->rhdr[1];
- put_string(namestr, &data);
- put_string(typestr, &data);
- put_string(domstr, &data);
-
- return mStatus_NoError;
- }
- }
-
-// Special support to enable the DNSServiceBrowse call made by Bonjour Browser
-// Remove after Bonjour Browser is updated to use DNSServiceQueryRecord instead of DNSServiceBrowse
-mDNSlocal void GenerateBonjourBrowserResponse(const domainname *const servicename, const mDNSInterfaceID id,
- request_state *const request, reply_state **const rep, reply_op_t op, DNSServiceFlags flags, mStatus err)
- {
- char namestr[MAX_DOMAIN_LABEL+1];
- char typestr[MAX_ESCAPED_DOMAIN_NAME];
- static const char domstr[] = ".";
- int len;
- char *data;
-
- *rep = NULL;
-
- // 1. Put first label in namestr
- ConvertDomainLabelToCString_unescaped((const domainlabel *)servicename, namestr);
-
- // 2. Put second label and "local" into typestr
- mDNS_snprintf(typestr, sizeof(typestr), "%#s.local.", SecondLabel(servicename));
-
- // Calculate reply data length
- len = sizeof(DNSServiceFlags);
- len += sizeof(mDNSu32); // if index
- len += sizeof(DNSServiceErrorType);
- len += (int) (strlen(namestr) + 1);
- len += (int) (strlen(typestr) + 1);
- len += (int) (strlen(domstr) + 1);
-
- // Build reply header
- *rep = create_reply(op, len, request);
- (*rep)->rhdr->flags = dnssd_htonl(flags);
- (*rep)->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(&mDNSStorage, id, mDNSfalse));
- (*rep)->rhdr->error = dnssd_htonl(err);
-
- // Build reply body
- data = (char *)&(*rep)->rhdr[1];
- put_string(namestr, &data);
- put_string(typestr, &data);
- put_string(domstr, &data);
- }
-
-// Returns a resource record (allocated w/ malloc) containing the data found in an IPC message
-// Data must be in the following format: flags, interfaceIndex, name, rrtype, rrclass, rdlen, rdata, (optional) ttl
-// (ttl only extracted/set if ttl argument is non-zero). Returns NULL for a bad-parameter error
-mDNSlocal AuthRecord *read_rr_from_ipc_msg(request_state *request, int GetTTL, int validate_flags)
- {
- DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend);
- mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend);
- char name[256];
- int str_err = get_string(&request->msgptr, request->msgend, name, sizeof(name));
- mDNSu16 type = get_uint16(&request->msgptr, request->msgend);
- mDNSu16 class = get_uint16(&request->msgptr, request->msgend);
- mDNSu16 rdlen = get_uint16(&request->msgptr, request->msgend);
- const char *rdata = get_rdata (&request->msgptr, request->msgend, rdlen);
- mDNSu32 ttl = GetTTL ? get_uint32(&request->msgptr, request->msgend) : 0;
- int storage_size = rdlen > sizeof(RDataBody) ? rdlen : sizeof(RDataBody);
- AuthRecord *rr;
- mDNSInterfaceID InterfaceID;
- AuthRecType artype;
-
- request->flags = flags;
-
- if (str_err) { LogMsg("ERROR: read_rr_from_ipc_msg - get_string"); return NULL; }
-
- if (!request->msgptr) { LogMsg("Error reading Resource Record from client"); return NULL; }
-
- if (validate_flags &&
- !((flags & kDNSServiceFlagsShared) == kDNSServiceFlagsShared) &&
- !((flags & kDNSServiceFlagsUnique) == kDNSServiceFlagsUnique))
- {
- LogMsg("ERROR: Bad resource record flags (must be kDNSServiceFlagsShared or kDNSServiceFlagsUnique)");
- return NULL;
- }
-
- rr = mallocL("AuthRecord/read_rr_from_ipc_msg", sizeof(AuthRecord) - sizeof(RDataBody) + storage_size);
- if (!rr) FatalError("ERROR: malloc");
-
- InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex);
- if (InterfaceID == mDNSInterface_LocalOnly)
- artype = AuthRecordLocalOnly;
- else if (InterfaceID == mDNSInterface_P2P)
- artype = AuthRecordP2P;
- else if ((InterfaceID == mDNSInterface_Any) && (flags & kDNSServiceFlagsIncludeP2P))
- artype = AuthRecordAnyIncludeP2P;
- else
- artype = AuthRecordAny;
-
- mDNS_SetupResourceRecord(rr, mDNSNULL, InterfaceID, type, 0,
- (mDNSu8) ((flags & kDNSServiceFlagsShared) ? kDNSRecordTypeShared : kDNSRecordTypeUnique), artype, mDNSNULL, mDNSNULL);
-
- if (!MakeDomainNameFromDNSNameString(&rr->namestorage, name))
- {
- LogMsg("ERROR: bad name: %s", name);
- freeL("AuthRecord/read_rr_from_ipc_msg", rr);
- return NULL;
- }
-
- if (flags & kDNSServiceFlagsAllowRemoteQuery) rr->AllowRemoteQuery = mDNStrue;
- rr->resrec.rrclass = class;
- rr->resrec.rdlength = rdlen;
- rr->resrec.rdata->MaxRDLength = rdlen;
- mDNSPlatformMemCopy(rr->resrec.rdata->u.data, rdata, rdlen);
- if (GetTTL) rr->resrec.rroriginalttl = ttl;
- rr->resrec.namehash = DomainNameHashValue(rr->resrec.name);
- SetNewRData(&rr->resrec, mDNSNULL, 0); // Sets rr->rdatahash for us
- return rr;
- }
-
-mDNSlocal int build_domainname_from_strings(domainname *srv, char *name, char *regtype, char *domain)
- {
- domainlabel n;
- domainname d, t;
-
- if (!MakeDomainLabelFromLiteralString(&n, name)) return -1;
- if (!MakeDomainNameFromDNSNameString(&t, regtype)) return -1;
- if (!MakeDomainNameFromDNSNameString(&d, domain)) return -1;
- if (!ConstructServiceName(srv, &n, &t, &d)) return -1;
- return 0;
- }
-
-mDNSlocal void send_all(dnssd_sock_t s, const char *ptr, int len)
- {
- int n = send(s, ptr, len, 0);
- // On a freshly-created Unix Domain Socket, the kernel should *never* fail to buffer a small write for us
- // (four bytes for a typical error code return, 12 bytes for DNSServiceGetProperty(DaemonVersion)).
- // If it does fail, we don't attempt to handle this failure, but we do log it so we know something is wrong.
- if (n < len)
- LogMsg("ERROR: send_all(%d) wrote %d of %d errno %d (%s)",
- s, n, len, dnssd_errno, dnssd_strerror(dnssd_errno));
- }
-
-#if 0
-mDNSlocal mDNSBool AuthorizedDomain(const request_state * const request, const domainname * const d, const DNameListElem * const doms)
-{
- const DNameListElem *delem = mDNSNULL;
- int bestDelta = -1; // the delta of the best match, lower is better
- int dLabels = 0;
- mDNSBool allow = mDNSfalse;
-
- if (SystemUID(request->uid)) return mDNStrue;
-
- dLabels = CountLabels(d);
- for (delem = doms; delem; delem = delem->next)
- {
- if (delem->uid)
- {
- int delemLabels = CountLabels(&delem->name);
- int delta = dLabels - delemLabels;
- if ((bestDelta == -1 || delta <= bestDelta) && SameDomainName(&delem->name, SkipLeadingLabels(d, delta)))
- {
- bestDelta = delta;
- allow = (allow || (delem->uid == request->uid));
- }
- }
- }
-
- return bestDelta == -1 ? mDNStrue : allow;
-}
-#endif
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - external helpers
-#endif
-
-mDNSlocal void external_start_advertising_helper(service_instance *const instance)
- {
- AuthRecord *st = instance->subtypes;
- ExtraResourceRecord *e;
- int i;
-
- if (mDNSIPPortIsZero(instance->request->u.servicereg.port))
- {
- LogInfo("external_start_advertising_helper: Not registering service with port number zero");
- return;
- }
-
-#if APPLE_OSX_mDNSResponder
- // Update packet filter if p2p interface already exists, otherwise,
- // if will be updated when we get the KEV_DL_IF_ATTACHED event for
- // the interface. Called here since we don't call external_start_advertising_service()
- // with the SRV record when advertising a service.
- mDNSInitPacketFilter();
-#endif // APPLE_OSX_mDNSResponder
-
- if (instance->external_advertise) LogMsg("external_start_advertising_helper: external_advertise already set!");
-
- for ( i = 0; i < instance->request->u.servicereg.num_subtypes; i++)
- external_start_advertising_service(&st[i].resrec);
-
- external_start_advertising_service(&instance->srs.RR_PTR.resrec);
- external_start_advertising_service(&instance->srs.RR_TXT.resrec);
-
- for (e = instance->srs.Extras; e; e = e->next)
- external_start_advertising_service(&e->r.resrec);
-
- instance->external_advertise = mDNStrue;
- }
-
-mDNSlocal void external_stop_advertising_helper(service_instance *const instance)
- {
- AuthRecord *st = instance->subtypes;
- ExtraResourceRecord *e;
- int i;
-
- if (!instance->external_advertise) return;
-
- LogInfo("external_stop_advertising_helper: calling external_stop_advertising_service");
-
- for ( i = 0; i < instance->request->u.servicereg.num_subtypes; i++)
- external_stop_advertising_service(&st[i].resrec);
-
- external_stop_advertising_service(&instance->srs.RR_PTR.resrec);
- external_stop_advertising_service(&instance->srs.RR_TXT.resrec);
-
- for (e = instance->srs.Extras; e; e = e->next)
- external_stop_advertising_service(&e->r.resrec);
-
- instance->external_advertise = mDNSfalse;
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - DNSServiceRegister
-#endif
-
-mDNSexport void FreeExtraRR(mDNS *const m, AuthRecord *const rr, mStatus result)
- {
- ExtraResourceRecord *extra = (ExtraResourceRecord *)rr->RecordContext;
- (void)m; // Unused
-
- if (result != mStatus_MemFree) { LogMsg("Error: FreeExtraRR invoked with unexpected error %d", result); return; }
-
- LogInfo(" FreeExtraRR %s", RRDisplayString(m, &rr->resrec));
-
- if (rr->resrec.rdata != &rr->rdatastorage)
- freeL("Extra RData", rr->resrec.rdata);
- freeL("ExtraResourceRecord/FreeExtraRR", extra);
- }
-
-mDNSlocal void unlink_and_free_service_instance(service_instance *srv)
- {
- ExtraResourceRecord *e = srv->srs.Extras, *tmp;
-
- external_stop_advertising_helper(srv);
-
- // clear pointers from parent struct
- if (srv->request)
- {
- service_instance **p = &srv->request->u.servicereg.instances;
- while (*p)
- {
- if (*p == srv) { *p = (*p)->next; break; }
- p = &(*p)->next;
- }
- }
-
- while (e)
- {
- e->r.RecordContext = e;
- tmp = e;
- e = e->next;
- FreeExtraRR(&mDNSStorage, &tmp->r, mStatus_MemFree);
- }
-
- if (srv->srs.RR_TXT.resrec.rdata != &srv->srs.RR_TXT.rdatastorage)
- freeL("TXT RData", srv->srs.RR_TXT.resrec.rdata);
-
- if (srv->subtypes) { freeL("ServiceSubTypes", srv->subtypes); srv->subtypes = NULL; }
- freeL("service_instance", srv);
- }
-
-// Count how many other service records we have locally with the same name, but different rdata.
-// For auto-named services, we can have at most one per machine -- if we allowed two auto-named services of
-// the same type on the same machine, we'd get into an infinite autoimmune-response loop of continuous renaming.
-mDNSexport int CountPeerRegistrations(mDNS *const m, ServiceRecordSet *const srs)
- {
- int count = 0;
- ResourceRecord *r = &srs->RR_SRV.resrec;
- AuthRecord *rr;
-
- for (rr = m->ResourceRecords; rr; rr=rr->next)
- if (rr->resrec.rrtype == kDNSType_SRV && SameDomainName(rr->resrec.name, r->name) && !IdenticalSameNameRecord(&rr->resrec, r))
- count++;
-
- verbosedebugf("%d peer registrations for %##s", count, r->name->c);
- return(count);
- }
-
-mDNSexport int CountExistingRegistrations(domainname *srv, mDNSIPPort port)
- {
- int count = 0;
- AuthRecord *rr;
- for (rr = mDNSStorage.ResourceRecords; rr; rr=rr->next)
- if (rr->resrec.rrtype == kDNSType_SRV &&
- mDNSSameIPPort(rr->resrec.rdata->u.srv.port, port) &&
- SameDomainName(rr->resrec.name, srv))
- count++;
- return(count);
- }
-
-mDNSlocal void SendServiceRemovalNotification(ServiceRecordSet *const srs)
- {
- reply_state *rep;
- service_instance *instance = srs->ServiceContext;
- if (GenerateNTDResponse(srs->RR_SRV.resrec.name, srs->RR_SRV.resrec.InterfaceID, instance->request, &rep, reg_service_reply_op, 0, mStatus_NoError) != mStatus_NoError)
- LogMsg("%3d: SendServiceRemovalNotification: %##s is not valid DNS-SD SRV name", instance->request->sd, srs->RR_SRV.resrec.name->c);
- else { append_reply(instance->request, rep); instance->clientnotified = mDNSfalse; }
- }
-
-// service registration callback performs three duties - frees memory for deregistered services,
-// handles name conflicts, and delivers completed registration information to the client
-mDNSlocal void regservice_callback(mDNS *const m, ServiceRecordSet *const srs, mStatus result)
- {
- mStatus err;
- mDNSBool SuppressError = mDNSfalse;
- service_instance *instance;
- reply_state *rep;
- (void)m; // Unused
-
- if (!srs) { LogMsg("regservice_callback: srs is NULL %d", result); return; }
-
- instance = srs->ServiceContext;
- if (!instance) { LogMsg("regservice_callback: srs->ServiceContext is NULL %d", result); return; }
-
- // don't send errors up to client for wide-area, empty-string registrations
- if (instance->request &&
- instance->request->u.servicereg.default_domain &&
- !instance->default_local)
- SuppressError = mDNStrue;
-
- if (mDNS_LoggingEnabled)
- {
- const char *const fmt =
- (result == mStatus_NoError) ? "%s DNSServiceRegister(%##s, %u) REGISTERED" :
- (result == mStatus_MemFree) ? "%s DNSServiceRegister(%##s, %u) DEREGISTERED" :
- (result == mStatus_NameConflict) ? "%s DNSServiceRegister(%##s, %u) NAME CONFLICT" :
- "%s DNSServiceRegister(%##s, %u) %s %d";
- char prefix[16] = "---:";
- if (instance->request) mDNS_snprintf(prefix, sizeof(prefix), "%3d:", instance->request->sd);
- LogOperation(fmt, prefix, srs->RR_SRV.resrec.name->c, mDNSVal16(srs->RR_SRV.resrec.rdata->u.srv.port),
- SuppressError ? "suppressed error" : "CALLBACK", result);
- }
-
- if (!instance->request && result != mStatus_MemFree) { LogMsg("regservice_callback: instance->request is NULL %d", result); return; }
-
- if (result == mStatus_NoError)
- {
- if (instance->request->u.servicereg.allowremotequery)
- {
- ExtraResourceRecord *e;
- srs->RR_ADV.AllowRemoteQuery = mDNStrue;
- srs->RR_PTR.AllowRemoteQuery = mDNStrue;
- srs->RR_SRV.AllowRemoteQuery = mDNStrue;
- srs->RR_TXT.AllowRemoteQuery = mDNStrue;
- for (e = instance->srs.Extras; e; e = e->next) e->r.AllowRemoteQuery = mDNStrue;
- }
-
- if (GenerateNTDResponse(srs->RR_SRV.resrec.name, srs->RR_SRV.resrec.InterfaceID, instance->request, &rep, reg_service_reply_op, kDNSServiceFlagsAdd, result) != mStatus_NoError)
- LogMsg("%3d: regservice_callback: %##s is not valid DNS-SD SRV name", instance->request->sd, srs->RR_SRV.resrec.name->c);
- else { append_reply(instance->request, rep); instance->clientnotified = mDNStrue; }
-
- if (instance->request->u.servicereg.InterfaceID == mDNSInterface_P2P || (!instance->request->u.servicereg.InterfaceID && SameDomainName(&instance->domain, &localdomain) && (instance->request->flags & kDNSServiceFlagsIncludeP2P)))
- {
- LogInfo("regservice_callback: calling external_start_advertising_helper()");
- external_start_advertising_helper(instance);
- }
- if (instance->request->u.servicereg.autoname && CountPeerRegistrations(m, srs) == 0)
- RecordUpdatedNiceLabel(m, 0); // Successfully got new name, tell user immediately
- }
- else if (result == mStatus_MemFree)
- {
- if (instance->request && instance->renameonmemfree)
- {
- external_stop_advertising_helper(instance);
- instance->renameonmemfree = 0;
- err = mDNS_RenameAndReregisterService(m, srs, &instance->request->u.servicereg.name);
- if (err) LogMsg("ERROR: regservice_callback - RenameAndReregisterService returned %d", err);
- // error should never happen - safest to log and continue
- }
- else
- unlink_and_free_service_instance(instance);
- }
- else if (result == mStatus_NameConflict)
- {
- if (instance->request->u.servicereg.autorename)
- {
- external_stop_advertising_helper(instance);
- if (instance->request->u.servicereg.autoname && CountPeerRegistrations(m, srs) == 0)
- {
- // On conflict for an autoname service, rename and reregister *all* autoname services
- IncrementLabelSuffix(&m->nicelabel, mDNStrue);
- mDNS_ConfigChanged(m); // Will call back into udsserver_handle_configchange()
- }
- else // On conflict for a non-autoname service, rename and reregister just that one service
- {
- if (instance->clientnotified) SendServiceRemovalNotification(srs);
- mDNS_RenameAndReregisterService(m, srs, mDNSNULL);
- }
- }
- else
- {
- if (!SuppressError)
- {
- if (GenerateNTDResponse(srs->RR_SRV.resrec.name, srs->RR_SRV.resrec.InterfaceID, instance->request, &rep, reg_service_reply_op, kDNSServiceFlagsAdd, result) != mStatus_NoError)
- LogMsg("%3d: regservice_callback: %##s is not valid DNS-SD SRV name", instance->request->sd, srs->RR_SRV.resrec.name->c);
- else { append_reply(instance->request, rep); instance->clientnotified = mDNStrue; }
- }
- unlink_and_free_service_instance(instance);
- }
- }
- else // Not mStatus_NoError, mStatus_MemFree, or mStatus_NameConflict
- {
- if (!SuppressError)
- {
- if (GenerateNTDResponse(srs->RR_SRV.resrec.name, srs->RR_SRV.resrec.InterfaceID, instance->request, &rep, reg_service_reply_op, kDNSServiceFlagsAdd, result) != mStatus_NoError)
- LogMsg("%3d: regservice_callback: %##s is not valid DNS-SD SRV name", instance->request->sd, srs->RR_SRV.resrec.name->c);
- else { append_reply(instance->request, rep); instance->clientnotified = mDNStrue; }
- }
- }
- }
-
-mDNSlocal void regrecord_callback(mDNS *const m, AuthRecord *rr, mStatus result)
- {
- (void)m; // Unused
- if (!rr->RecordContext) // parent struct already freed by termination callback
- {
- if (result == mStatus_NoError)
- LogMsg("Error: regrecord_callback: successful registration of orphaned record %s", ARDisplayString(m, rr));
- else
- {
- if (result != mStatus_MemFree) LogMsg("regrecord_callback: error %d received after parent termination", result);
-
- // We come here when the record is being deregistered either from DNSServiceRemoveRecord or connection_termination.
- // If the record has been updated, we need to free the rdata. Everytime we call mDNS_Update, it calls update_callback
- // with the old rdata (so that we can free it) and stores the new rdata in "rr->resrec.rdata". This means, we need
- // to free the latest rdata for which the update_callback was never called with.
- if (rr->resrec.rdata != &rr->rdatastorage) freeL("RData/regrecord_callback", rr->resrec.rdata);
- freeL("AuthRecord/regrecord_callback", rr);
- }
- }
- else
- {
- registered_record_entry *re = rr->RecordContext;
- request_state *request = re->request;
-
- if (mDNS_LoggingEnabled)
- {
- char *fmt = (result == mStatus_NoError) ? "%3d: DNSServiceRegisterRecord(%u %s) REGISTERED" :
- (result == mStatus_MemFree) ? "%3d: DNSServiceRegisterRecord(%u %s) DEREGISTERED" :
- (result == mStatus_NameConflict) ? "%3d: DNSServiceRegisterRecord(%u %s) NAME CONFLICT" :
- "%3d: DNSServiceRegisterRecord(%u %s) %d";
- LogOperation(fmt, request->sd, re->key, RRDisplayString(m, &rr->resrec), result);
- }
-
- if (result != mStatus_MemFree)
- {
- int len = sizeof(DNSServiceFlags) + sizeof(mDNSu32) + sizeof(DNSServiceErrorType);
- reply_state *reply = create_reply(reg_record_reply_op, len, request);
- reply->mhdr->client_context = re->regrec_client_context;
- reply->rhdr->flags = dnssd_htonl(0);
- reply->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(m, rr->resrec.InterfaceID, mDNSfalse));
- reply->rhdr->error = dnssd_htonl(result);
- append_reply(request, reply);
- }
-
- if (result)
- {
- // unlink from list, free memory
- registered_record_entry **ptr = &request->u.reg_recs;
- while (*ptr && (*ptr) != re) ptr = &(*ptr)->next;
- if (!*ptr) { LogMsg("regrecord_callback - record not in list!"); return; }
- *ptr = (*ptr)->next;
- freeL("registered_record_entry AuthRecord regrecord_callback", re->rr);
- freeL("registered_record_entry regrecord_callback", re);
- }
- else
- {
- if (re->external_advertise) LogMsg("regrecord_callback: external_advertise already set!");
-
- if (re->origInterfaceID == mDNSInterface_P2P || (!re->origInterfaceID && IsLocalDomain(&rr->namestorage) && (request->flags & kDNSServiceFlagsIncludeP2P)))
- {
- LogInfo("regrecord_callback: calling external_start_advertising_service");
- external_start_advertising_service(&rr->resrec);
- re->external_advertise = mDNStrue;
- }
- }
- }
- }
-
-mDNSlocal void connection_termination(request_state *request)
- {
- // When terminating a shared connection, we need to scan the all_requests list
- // and terminate any subbordinate operations sharing this file descriptor
- request_state **req = &all_requests;
-
- LogOperation("%3d: DNSServiceCreateConnection STOP", request->sd);
-
- while (*req)
- {
- if ((*req)->primary == request)
- {
- // Since we're already doing a list traversal, we unlink the request directly instead of using AbortUnlinkAndFree()
- request_state *tmp = *req;
- if (tmp->primary == tmp) LogMsg("connection_termination ERROR (*req)->primary == *req for %p %d", tmp, tmp->sd);
- if (tmp->replies) LogMsg("connection_termination ERROR How can subordinate req %p %d have replies queued?", tmp, tmp->sd);
- abort_request(tmp);
- *req = tmp->next;
- freeL("request_state/connection_termination", tmp);
- }
- else
- req = &(*req)->next;
- }
-
- while (request->u.reg_recs)
- {
- registered_record_entry *ptr = request->u.reg_recs;
- LogOperation("%3d: DNSServiceRegisterRecord(%u %s) STOP", request->sd, ptr->key, RRDisplayString(&mDNSStorage, &ptr->rr->resrec));
- request->u.reg_recs = request->u.reg_recs->next;
- ptr->rr->RecordContext = NULL;
- if (ptr->external_advertise)
- {
- ptr->external_advertise = mDNSfalse;
- external_stop_advertising_service(&ptr->rr->resrec);
- }
- mDNS_Deregister(&mDNSStorage, ptr->rr); // Will free ptr->rr for us
- freeL("registered_record_entry/connection_termination", ptr);
- }
- }
-
-mDNSlocal void handle_cancel_request(request_state *request)
- {
- request_state **req = &all_requests;
- LogOperation("%3d: Cancel %08X %08X", request->sd, request->hdr.client_context.u32[1], request->hdr.client_context.u32[0]);
- while (*req)
- {
- if ((*req)->primary == request &&
- (*req)->hdr.client_context.u32[0] == request->hdr.client_context.u32[0] &&
- (*req)->hdr.client_context.u32[1] == request->hdr.client_context.u32[1])
- {
- // Since we're already doing a list traversal, we unlink the request directly instead of using AbortUnlinkAndFree()
- request_state *tmp = *req;
- abort_request(tmp);
- *req = tmp->next;
- freeL("request_state/handle_cancel_request", tmp);
- }
- else
- req = &(*req)->next;
- }
- }
-
-mDNSlocal mStatus handle_regrecord_request(request_state *request)
- {
- mStatus err = mStatus_BadParamErr;
- AuthRecord *rr = read_rr_from_ipc_msg(request, 1, 1);
- if (rr)
- {
- registered_record_entry *re;
- // Don't allow non-local domains to be regsitered as LocalOnly. Allowing this would permit
- // clients to register records such as www.bigbank.com A w.x.y.z to redirect Safari.
- if (rr->resrec.InterfaceID == mDNSInterface_LocalOnly && !IsLocalDomain(rr->resrec.name) &&
- rr->resrec.rrclass == kDNSClass_IN && (rr->resrec.rrtype == kDNSType_A || rr->resrec.rrtype == kDNSType_AAAA ||
- rr->resrec.rrtype == kDNSType_CNAME))
- {
- freeL("AuthRecord/handle_regrecord_request", rr);
- return (mStatus_BadParamErr);
- }
- // allocate registration entry, link into list
- re = mallocL("registered_record_entry", sizeof(registered_record_entry));
- if (!re) FatalError("ERROR: malloc");
- re->key = request->hdr.reg_index;
- re->rr = rr;
- re->regrec_client_context = request->hdr.client_context;
- re->request = request;
- re->external_advertise = mDNSfalse;
- rr->RecordContext = re;
- rr->RecordCallback = regrecord_callback;
-
- re->origInterfaceID = rr->resrec.InterfaceID;
- if (rr->resrec.InterfaceID == mDNSInterface_P2P) rr->resrec.InterfaceID = mDNSInterface_Any;
-#if 0
- if (!AuthorizedDomain(request, rr->resrec.name, AutoRegistrationDomains)) return (mStatus_NoError);
-#endif
- if (rr->resrec.rroriginalttl == 0)
- rr->resrec.rroriginalttl = DefaultTTLforRRType(rr->resrec.rrtype);
-
- LogOperation("%3d: DNSServiceRegisterRecord(%u %s) START", request->sd, re->key, RRDisplayString(&mDNSStorage, &rr->resrec));
- err = mDNS_Register(&mDNSStorage, rr);
- if (err)
- {
- LogOperation("%3d: DNSServiceRegisterRecord(%u %s) ERROR (%d)", request->sd, re->key, RRDisplayString(&mDNSStorage, &rr->resrec), err);
- freeL("registered_record_entry", re);
- freeL("registered_record_entry/AuthRecord", rr);
- }
- else
- {
- re->next = request->u.reg_recs;
- request->u.reg_recs = re;
- }
- }
- return(err);
- }
-
-mDNSlocal void UpdateDeviceInfoRecord(mDNS *const m);
-
-mDNSlocal void regservice_termination_callback(request_state *request)
- {
- if (!request) { LogMsg("regservice_termination_callback context is NULL"); return; }
- while (request->u.servicereg.instances)
- {
- service_instance *p = request->u.servicereg.instances;
- request->u.servicereg.instances = request->u.servicereg.instances->next;
- // only safe to free memory if registration is not valid, i.e. deregister fails (which invalidates p)
- LogOperation("%3d: DNSServiceRegister(%##s, %u) STOP",
- request->sd, p->srs.RR_SRV.resrec.name->c, mDNSVal16(p->srs.RR_SRV.resrec.rdata->u.srv.port));
-
- external_stop_advertising_helper(p);
-
- // Clear backpointer *before* calling mDNS_DeregisterService/unlink_and_free_service_instance
- // We don't need unlink_and_free_service_instance to cut its element from the list, because we're already advancing
- // request->u.servicereg.instances as we work our way through the list, implicitly cutting one element at a time
- // We can't clear p->request *after* the calling mDNS_DeregisterService/unlink_and_free_service_instance
- // because by then we might have already freed p
- p->request = NULL;
- if (mDNS_DeregisterService(&mDNSStorage, &p->srs)) unlink_and_free_service_instance(p);
- // Don't touch service_instance *p after this -- it's likely to have been freed already
- }
- if (request->u.servicereg.txtdata)
- { freeL("service_info txtdata", request->u.servicereg.txtdata); request->u.servicereg.txtdata = NULL; }
- if (request->u.servicereg.autoname)
- {
- // Clear autoname before calling UpdateDeviceInfoRecord() so it doesn't mistakenly include this in its count of active autoname registrations
- request->u.servicereg.autoname = mDNSfalse;
- UpdateDeviceInfoRecord(&mDNSStorage);
- }
- }
-
-mDNSlocal request_state *LocateSubordinateRequest(request_state *request)
- {
- request_state *req;
- for (req = all_requests; req; req = req->next)
- if (req->primary == request &&
- req->hdr.client_context.u32[0] == request->hdr.client_context.u32[0] &&
- req->hdr.client_context.u32[1] == request->hdr.client_context.u32[1]) return(req);
- return(request);
- }
-
-mDNSlocal mStatus add_record_to_service(request_state *request, service_instance *instance, mDNSu16 rrtype, mDNSu16 rdlen, const char *rdata, mDNSu32 ttl)
- {
- ServiceRecordSet *srs = &instance->srs;
- mStatus result;
- int size = rdlen > sizeof(RDataBody) ? rdlen : sizeof(RDataBody);
- ExtraResourceRecord *extra = mallocL("ExtraResourceRecord", sizeof(*extra) - sizeof(RDataBody) + size);
- if (!extra) { my_perror("ERROR: malloc"); return mStatus_NoMemoryErr; }
-
- mDNSPlatformMemZero(extra, sizeof(ExtraResourceRecord)); // OK if oversized rdata not zero'd
- extra->r.resrec.rrtype = rrtype;
- extra->r.rdatastorage.MaxRDLength = (mDNSu16) size;
- extra->r.resrec.rdlength = rdlen;
- mDNSPlatformMemCopy(&extra->r.rdatastorage.u.data, rdata, rdlen);
-
- result = mDNS_AddRecordToService(&mDNSStorage, srs, extra, &extra->r.rdatastorage, ttl,
- (request->flags & kDNSServiceFlagsIncludeP2P) ? 1: 0);
- if (result) { freeL("ExtraResourceRecord/add_record_to_service", extra); return result; }
-
- extra->ClientID = request->hdr.reg_index;
- if (instance->external_advertise && (instance->request->u.servicereg.InterfaceID == mDNSInterface_P2P || (!instance->request->u.servicereg.InterfaceID && SameDomainName(&instance->domain, &localdomain) && (instance->request->flags & kDNSServiceFlagsIncludeP2P))))
- {
- LogInfo("add_record_to_service: calling external_start_advertising_service");
- external_start_advertising_service(&extra->r.resrec);
- }
- return result;
- }
-
-mDNSlocal mStatus handle_add_request(request_state *request)
- {
- service_instance *i;
- mStatus result = mStatus_UnknownErr;
- DNSServiceFlags flags = get_flags (&request->msgptr, request->msgend);
- mDNSu16 rrtype = get_uint16(&request->msgptr, request->msgend);
- mDNSu16 rdlen = get_uint16(&request->msgptr, request->msgend);
- const char *rdata = get_rdata (&request->msgptr, request->msgend, rdlen);
- mDNSu32 ttl = get_uint32(&request->msgptr, request->msgend);
- if (!ttl) ttl = DefaultTTLforRRType(rrtype);
- (void)flags; // Unused
-
- if (!request->msgptr) { LogMsg("%3d: DNSServiceAddRecord(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
-
- // If this is a shared connection, check if the operation actually applies to a subordinate request_state object
- if (request->terminate == connection_termination) request = LocateSubordinateRequest(request);
-
- if (request->terminate != regservice_termination_callback)
- { LogMsg("%3d: DNSServiceAddRecord(not a registered service ref)", request->sd); return(mStatus_BadParamErr); }
-
- // For a service registered with zero port, don't allow adding records. This mostly happens due to a bug
- // in the application. See radar://9165807.
- if (mDNSIPPortIsZero(request->u.servicereg.port))
- { LogMsg("%3d: DNSServiceAddRecord: adding record to a service registered with zero port", request->sd); return(mStatus_BadParamErr); }
-
- LogOperation("%3d: DNSServiceAddRecord(%X, %##s, %s, %d)", request->sd, flags,
- (request->u.servicereg.instances) ? request->u.servicereg.instances->srs.RR_SRV.resrec.name->c : NULL, DNSTypeName(rrtype), rdlen);
-
- for (i = request->u.servicereg.instances; i; i = i->next)
- {
- result = add_record_to_service(request, i, rrtype, rdlen, rdata, ttl);
- if (result && i->default_local) break;
- else result = mStatus_NoError; // suppress non-local default errors
- }
-
- return(result);
- }
-
-mDNSlocal void update_callback(mDNS *const m, AuthRecord *const rr, RData *oldrd, mDNSu16 oldrdlen)
- {
- mDNSBool external_advertise = (rr->UpdateContext) ? *((mDNSBool *)rr->UpdateContext) : mDNSfalse;
- (void)m; // Unused
-
- // There are three cases.
- //
- // 1. We have updated the primary TXT record of the service
- // 2. We have updated the TXT record that was added to the service using DNSServiceAddRecord
- // 3. We have updated the TXT record that was registered using DNSServiceRegisterRecord
- //
- // external_advertise is set if we have advertised at least once during the initial addition
- // of the record in all of the three cases above. We should have checked for InterfaceID/LocalDomain
- // checks during the first time and hence we don't do any checks here
- if (external_advertise)
- {
- ResourceRecord ext = rr->resrec;
- if (ext.rdlength == oldrdlen && mDNSPlatformMemSame(&ext.rdata->u, &oldrd->u, oldrdlen)) goto exit;
- SetNewRData(&ext, oldrd, oldrdlen);
- external_stop_advertising_service(&ext);
- LogInfo("update_callback: calling external_start_advertising_service");
- external_start_advertising_service(&rr->resrec);
- }
-exit:
- if (oldrd != &rr->rdatastorage) freeL("RData/update_callback", oldrd);
- }
-
-mDNSlocal mStatus update_record(AuthRecord *rr, mDNSu16 rdlen, const char *rdata, mDNSu32 ttl, const mDNSBool *const external_advertise)
- {
- mStatus result;
- const int rdsize = rdlen > sizeof(RDataBody) ? rdlen : sizeof(RDataBody);
- RData *newrd = mallocL("RData/update_record", sizeof(RData) - sizeof(RDataBody) + rdsize);
- if (!newrd) FatalError("ERROR: malloc");
- newrd->MaxRDLength = (mDNSu16) rdsize;
- mDNSPlatformMemCopy(&newrd->u, rdata, rdlen);
-
- // BIND named (name daemon) doesn't allow TXT records with zero-length rdata. This is strictly speaking correct,
- // since RFC 1035 specifies a TXT record as "One or more <character-string>s", not "Zero or more <character-string>s".
- // Since some legacy apps try to create zero-length TXT records, we'll silently correct it here.
- if (rr->resrec.rrtype == kDNSType_TXT && rdlen == 0) { rdlen = 1; newrd->u.txt.c[0] = 0; }
-
- if (external_advertise) rr->UpdateContext = (void *)external_advertise;
-
- result = mDNS_Update(&mDNSStorage, rr, ttl, rdlen, newrd, update_callback);
- if (result) { LogMsg("update_record: Error %d for %s", (int)result, ARDisplayString(&mDNSStorage, rr)); freeL("RData/update_record", newrd); }
- return result;
- }
-
-mDNSlocal mStatus handle_update_request(request_state *request)
- {
- const ipc_msg_hdr *const hdr = &request->hdr;
- mStatus result = mStatus_BadReferenceErr;
- service_instance *i;
- AuthRecord *rr = NULL;
-
- // get the message data
- DNSServiceFlags flags = get_flags (&request->msgptr, request->msgend); // flags unused
- mDNSu16 rdlen = get_uint16(&request->msgptr, request->msgend);
- const char *rdata = get_rdata (&request->msgptr, request->msgend, rdlen);
- mDNSu32 ttl = get_uint32(&request->msgptr, request->msgend);
- (void)flags; // Unused
-
- if (!request->msgptr) { LogMsg("%3d: DNSServiceUpdateRecord(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
-
- // If this is a shared connection, check if the operation actually applies to a subordinate request_state object
- if (request->terminate == connection_termination) request = LocateSubordinateRequest(request);
-
- if (request->terminate == connection_termination)
- {
- // update an individually registered record
- registered_record_entry *reptr;
- for (reptr = request->u.reg_recs; reptr; reptr = reptr->next)
- {
- if (reptr->key == hdr->reg_index)
- {
- result = update_record(reptr->rr, rdlen, rdata, ttl, &reptr->external_advertise);
- LogOperation("%3d: DNSServiceUpdateRecord(%##s, %s)",
- request->sd, reptr->rr->resrec.name->c, reptr->rr ? DNSTypeName(reptr->rr->resrec.rrtype) : "<NONE>");
- goto end;
- }
- }
- result = mStatus_BadReferenceErr;
- goto end;
- }
-
- if (request->terminate != regservice_termination_callback)
- { LogMsg("%3d: DNSServiceUpdateRecord(not a registered service ref)", request->sd); return(mStatus_BadParamErr); }
-
- // For a service registered with zero port, only SRV record is initialized. Don't allow any updates.
- if (mDNSIPPortIsZero(request->u.servicereg.port))
- { LogMsg("%3d: DNSServiceUpdateRecord: updating the record of a service registered with zero port", request->sd); return(mStatus_BadParamErr); }
-
- // update the saved off TXT data for the service
- if (hdr->reg_index == TXT_RECORD_INDEX)
- {
- if (request->u.servicereg.txtdata)
- { freeL("service_info txtdata", request->u.servicereg.txtdata); request->u.servicereg.txtdata = NULL; }
- if (rdlen > 0)
- {
- request->u.servicereg.txtdata = mallocL("service_info txtdata", rdlen);
- if (!request->u.servicereg.txtdata) FatalError("ERROR: handle_update_request - malloc");
- mDNSPlatformMemCopy(request->u.servicereg.txtdata, rdata, rdlen);
- }
- request->u.servicereg.txtlen = rdlen;
- }
-
- // update a record from a service record set
- for (i = request->u.servicereg.instances; i; i = i->next)
- {
- if (hdr->reg_index == TXT_RECORD_INDEX) rr = &i->srs.RR_TXT;
- else
- {
- ExtraResourceRecord *e;
- for (e = i->srs.Extras; e; e = e->next)
- if (e->ClientID == hdr->reg_index) { rr = &e->r; break; }
- }
-
- if (!rr) { result = mStatus_BadReferenceErr; goto end; }
- result = update_record(rr, rdlen, rdata, ttl, &i->external_advertise);
- if (result && i->default_local) goto end;
- else result = mStatus_NoError; // suppress non-local default errors
- }
-
-end:
- if (request->terminate == regservice_termination_callback)
- LogOperation("%3d: DNSServiceUpdateRecord(%##s, %s)", request->sd,
- (request->u.servicereg.instances) ? request->u.servicereg.instances->srs.RR_SRV.resrec.name->c : NULL,
- rr ? DNSTypeName(rr->resrec.rrtype) : "<NONE>");
-
- return(result);
- }
-
-// remove a resource record registered via DNSServiceRegisterRecord()
-mDNSlocal mStatus remove_record(request_state *request)
- {
- mStatus err = mStatus_UnknownErr;
- registered_record_entry *e, **ptr = &request->u.reg_recs;
-
- while (*ptr && (*ptr)->key != request->hdr.reg_index) ptr = &(*ptr)->next;
- if (!*ptr) { LogMsg("%3d: DNSServiceRemoveRecord(%u) not found", request->sd, request->hdr.reg_index); return mStatus_BadReferenceErr; }
- e = *ptr;
- *ptr = e->next; // unlink
-
- LogOperation("%3d: DNSServiceRemoveRecord(%u %s)", request->sd, e->key, RRDisplayString(&mDNSStorage, &e->rr->resrec));
- e->rr->RecordContext = NULL;
- if (e->external_advertise)
- {
- external_stop_advertising_service(&e->rr->resrec);
- e->external_advertise = mDNSfalse;
- }
- err = mDNS_Deregister(&mDNSStorage, e->rr); // Will free e->rr for us; we're responsible for freeing e
- if (err)
- {
- LogMsg("ERROR: remove_record, mDNS_Deregister: %d", err);
- freeL("registered_record_entry AuthRecord remove_record", e->rr);
- }
-
- freeL("registered_record_entry remove_record", e);
- return err;
- }
-
-mDNSlocal mStatus remove_extra(const request_state *const request, service_instance *const serv, mDNSu16 *const rrtype)
- {
- mStatus err = mStatus_BadReferenceErr;
- ExtraResourceRecord *ptr;
-
- for (ptr = serv->srs.Extras; ptr; ptr = ptr->next)
- {
- if (ptr->ClientID == request->hdr.reg_index) // found match
- {
- *rrtype = ptr->r.resrec.rrtype;
- if (serv->external_advertise) external_stop_advertising_service(&ptr->r.resrec);
- err = mDNS_RemoveRecordFromService(&mDNSStorage, &serv->srs, ptr, FreeExtraRR, ptr);
- break;
- }
- }
- return err;
- }
-
-mDNSlocal mStatus handle_removerecord_request(request_state *request)
- {
- mStatus err = mStatus_BadReferenceErr;
- get_flags(&request->msgptr, request->msgend); // flags unused
-
- if (!request->msgptr) { LogMsg("%3d: DNSServiceRemoveRecord(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
-
- // If this is a shared connection, check if the operation actually applies to a subordinate request_state object
- if (request->terminate == connection_termination) request = LocateSubordinateRequest(request);
-
- if (request->terminate == connection_termination)
- err = remove_record(request); // remove individually registered record
- else if (request->terminate != regservice_termination_callback)
- { LogMsg("%3d: DNSServiceRemoveRecord(not a registered service ref)", request->sd); return(mStatus_BadParamErr); }
- else
- {
- service_instance *i;
- mDNSu16 rrtype = 0;
- LogOperation("%3d: DNSServiceRemoveRecord(%##s, %s)", request->sd,
- (request->u.servicereg.instances) ? request->u.servicereg.instances->srs.RR_SRV.resrec.name->c : NULL,
- rrtype ? DNSTypeName(rrtype) : "<NONE>");
- for (i = request->u.servicereg.instances; i; i = i->next)
- {
- err = remove_extra(request, i, &rrtype);
- if (err && i->default_local) break;
- else err = mStatus_NoError; // suppress non-local default errors
- }
- }
-
- return(err);
- }
-
-// If there's a comma followed by another character,
-// FindFirstSubType overwrites the comma with a nul and returns the pointer to the next character.
-// Otherwise, it returns a pointer to the final nul at the end of the string
-mDNSlocal char *FindFirstSubType(char *p)
- {
- while (*p)
- {
- if (p[0] == '\\' && p[1]) p += 2;
- else if (p[0] == ',' && p[1]) { *p++ = 0; return(p); }
- else p++;
- }
- return(p);
- }
-
-// If there's a comma followed by another character,
-// FindNextSubType overwrites the comma with a nul and returns the pointer to the next character.
-// If it finds an illegal unescaped dot in the subtype name, it returns mDNSNULL
-// Otherwise, it returns a pointer to the final nul at the end of the string
-mDNSlocal char *FindNextSubType(char *p)
- {
- while (*p)
- {
- if (p[0] == '\\' && p[1]) // If escape character
- p += 2; // ignore following character
- else if (p[0] == ',') // If we found a comma
- {
- if (p[1]) *p++ = 0;
- return(p);
- }
- else if (p[0] == '.')
- return(mDNSNULL);
- else p++;
- }
- return(p);
- }
-
-// Returns -1 if illegal subtype found
-mDNSexport mDNSs32 ChopSubTypes(char *regtype)
- {
- mDNSs32 NumSubTypes = 0;
- char *stp = FindFirstSubType(regtype);
- while (stp && *stp) // If we found a comma...
- {
- if (*stp == ',') return(-1);
- NumSubTypes++;
- stp = FindNextSubType(stp);
- }
- if (!stp) return(-1);
- return(NumSubTypes);
- }
-
-mDNSexport AuthRecord *AllocateSubTypes(mDNSs32 NumSubTypes, char *p)
- {
- AuthRecord *st = mDNSNULL;
- if (NumSubTypes)
- {
- mDNSs32 i;
- st = mallocL("ServiceSubTypes", NumSubTypes * sizeof(AuthRecord));
- if (!st) return(mDNSNULL);
- for (i = 0; i < NumSubTypes; i++)
- {
- mDNS_SetupResourceRecord(&st[i], mDNSNULL, mDNSInterface_Any, kDNSQType_ANY, kStandardTTL, 0, AuthRecordAny, mDNSNULL, mDNSNULL);
- while (*p) p++;
- p++;
- if (!MakeDomainNameFromDNSNameString(&st[i].namestorage, p))
- { freeL("ServiceSubTypes", st); return(mDNSNULL); }
- }
- }
- return(st);
- }
-
-mDNSlocal mStatus register_service_instance(request_state *request, const domainname *domain)
- {
- service_instance **ptr, *instance;
- const int extra_size = (request->u.servicereg.txtlen > sizeof(RDataBody)) ? (request->u.servicereg.txtlen - sizeof(RDataBody)) : 0;
- const mDNSBool DomainIsLocal = SameDomainName(domain, &localdomain);
- mStatus result;
- mDNSInterfaceID interfaceID = request->u.servicereg.InterfaceID;
- mDNSu32 regFlags = 0;
-
- if (interfaceID == mDNSInterface_P2P)
- {
- interfaceID = mDNSInterface_Any;
- regFlags |= regFlagIncludeP2P;
- }
- else if (request->flags & kDNSServiceFlagsIncludeP2P)
- regFlags |= regFlagIncludeP2P;
-
- // client guarantees that record names are unique
- if (request->flags & kDNSServiceFlagsForce)
- regFlags |= regFlagKnownUnique;
-
- // If the client specified an interface, but no domain, then we honor the specified interface for the "local" (mDNS)
- // registration but for the wide-area registrations we don't (currently) have any concept of a wide-area unicast
- // registrations scoped to a specific interface, so for the automatic domains we add we must *not* specify an interface.
- // (Specifying an interface with an apparently wide-area domain (i.e. something other than "local")
- // currently forces the registration to use mDNS multicast despite the apparently wide-area domain.)
- if (request->u.servicereg.default_domain && !DomainIsLocal) interfaceID = mDNSInterface_Any;
-
- for (ptr = &request->u.servicereg.instances; *ptr; ptr = &(*ptr)->next)
- {
- if (SameDomainName(&(*ptr)->domain, domain))
- {
- LogMsg("register_service_instance: domain %##s already registered for %#s.%##s",
- domain->c, &request->u.servicereg.name, &request->u.servicereg.type);
- return mStatus_AlreadyRegistered;
- }
- }
-
- if (mDNSStorage.KnownBugs & mDNS_KnownBug_LimitedIPv6)
- {
- // Special-case hack: On Mac OS X 10.6.x and earlier we don't advertise SMB service in AutoTunnel domains,
- // because AutoTunnel services have to support IPv6, and in Mac OS X 10.6.x the SMB server does not.
- // <rdar://problem/5482322> BTMM: Don't advertise SMB with BTMM because it doesn't support IPv6
- if (SameDomainName(&request->u.servicereg.type, (const domainname *) "\x4" "_smb" "\x4" "_tcp"))
- {
- DomainAuthInfo *AuthInfo = GetAuthInfoForName(&mDNSStorage, domain);
- if (AuthInfo && AuthInfo->AutoTunnel) return(kDNSServiceErr_Unsupported);
- }
- }
-
- instance = mallocL("service_instance", sizeof(*instance) + extra_size);
- if (!instance) { my_perror("ERROR: malloc"); return mStatus_NoMemoryErr; }
-
- instance->next = mDNSNULL;
- instance->request = request;
- instance->subtypes = AllocateSubTypes(request->u.servicereg.num_subtypes, request->u.servicereg.type_as_string);
- instance->renameonmemfree = 0;
- instance->clientnotified = mDNSfalse;
- instance->default_local = (request->u.servicereg.default_domain && DomainIsLocal);
- instance->external_advertise = mDNSfalse;
- AssignDomainName(&instance->domain, domain);
-
- if (request->u.servicereg.num_subtypes && !instance->subtypes)
- { unlink_and_free_service_instance(instance); instance = NULL; FatalError("ERROR: malloc"); }
-
- result = mDNS_RegisterService(&mDNSStorage, &instance->srs,
- &request->u.servicereg.name, &request->u.servicereg.type, domain,
- request->u.servicereg.host.c[0] ? &request->u.servicereg.host : NULL,
- request->u.servicereg.port,
- request->u.servicereg.txtdata, request->u.servicereg.txtlen,
- instance->subtypes, request->u.servicereg.num_subtypes,
- interfaceID, regservice_callback, instance, regFlags);
-
- if (!result)
- {
- *ptr = instance; // Append this to the end of our request->u.servicereg.instances list
- LogOperation("%3d: DNSServiceRegister(%##s, %u) ADDED",
- instance->request->sd, instance->srs.RR_SRV.resrec.name->c, mDNSVal16(request->u.servicereg.port));
- }
- else
- {
- LogMsg("register_service_instance %#s.%##s%##s error %d",
- &request->u.servicereg.name, &request->u.servicereg.type, domain->c, result);
- unlink_and_free_service_instance(instance);
- }
-
- return result;
- }
-
-mDNSlocal void udsserver_default_reg_domain_changed(const DNameListElem *const d, const mDNSBool add)
- {
- request_state *request;
-
-#if APPLE_OSX_mDNSResponder
- machserver_automatic_registration_domain_changed(&d->name, add);
-#endif // APPLE_OSX_mDNSResponder
-
- LogMsg("%s registration domain %##s", add ? "Adding" : "Removing", d->name.c);
- for (request = all_requests; request; request = request->next)
- {
- if (request->terminate != regservice_termination_callback) continue;
- if (!request->u.servicereg.default_domain) continue;
- if (!d->uid || SystemUID(request->uid) || request->uid == d->uid)
- {
- service_instance **ptr = &request->u.servicereg.instances;
- while (*ptr && !SameDomainName(&(*ptr)->domain, &d->name)) ptr = &(*ptr)->next;
- if (add)
- {
- // If we don't already have this domain in our list for this registration, add it now
- if (!*ptr) register_service_instance(request, &d->name);
- else debugf("udsserver_default_reg_domain_changed %##s already in list, not re-adding", &d->name);
- }
- else
- {
- // Normally we should not fail to find the specified instance
- // One case where this can happen is if a uDNS update fails for some reason,
- // and regservice_callback then calls unlink_and_free_service_instance and disposes of that instance.
- if (!*ptr)
- LogMsg("udsserver_default_reg_domain_changed domain %##s not found for service %#s type %s",
- &d->name, request->u.servicereg.name.c, request->u.servicereg.type_as_string);
- else
- {
- DNameListElem *p;
- for (p = AutoRegistrationDomains; p; p=p->next)
- if (!p->uid || SystemUID(request->uid) || request->uid == p->uid)
- if (SameDomainName(&d->name, &p->name)) break;
- if (p) debugf("udsserver_default_reg_domain_changed %##s still in list, not removing", &d->name);
- else
- {
- mStatus err;
- service_instance *si = *ptr;
- *ptr = si->next;
- if (si->clientnotified) SendServiceRemovalNotification(&si->srs); // Do this *before* clearing si->request backpointer
- // Now that we've cut this service_instance from the list, we MUST clear the si->request backpointer.
- // Otherwise what can happen is this: While our mDNS_DeregisterService is in the
- // process of completing asynchronously, the client cancels the entire operation, so
- // regservice_termination_callback then runs through the whole list deregistering each
- // instance, clearing the backpointers, and then disposing the parent request_state object.
- // However, because this service_instance isn't in the list any more, regservice_termination_callback
- // has no way to find it and clear its backpointer, and then when our mDNS_DeregisterService finally
- // completes later with a mStatus_MemFree message, it calls unlink_and_free_service_instance() with
- // a service_instance with a stale si->request backpointer pointing to memory that's already been freed.
- si->request = NULL;
- err = mDNS_DeregisterService(&mDNSStorage, &si->srs);
- if (err) { LogMsg("udsserver_default_reg_domain_changed err %d", err); unlink_and_free_service_instance(si); }
- }
- }
- }
- }
- }
- }
-
-mDNSlocal mStatus handle_regservice_request(request_state *request)
- {
- char name[256]; // Lots of spare space for extra-long names that we'll auto-truncate down to 63 bytes
- char domain[MAX_ESCAPED_DOMAIN_NAME], host[MAX_ESCAPED_DOMAIN_NAME];
- char type_as_string[MAX_ESCAPED_DOMAIN_NAME];
- domainname d, srv;
- mStatus err;
-
- DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend);
- mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend);
- mDNSInterfaceID InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex);
- if (interfaceIndex && !InterfaceID)
- { LogMsg("ERROR: handle_regservice_request - Couldn't find interfaceIndex %d", interfaceIndex); return(mStatus_BadParamErr); }
-
- if (get_string(&request->msgptr, request->msgend, name, sizeof(name)) < 0 ||
- get_string(&request->msgptr, request->msgend, type_as_string, MAX_ESCAPED_DOMAIN_NAME) < 0 ||
- get_string(&request->msgptr, request->msgend, domain, MAX_ESCAPED_DOMAIN_NAME) < 0 ||
- get_string(&request->msgptr, request->msgend, host, MAX_ESCAPED_DOMAIN_NAME) < 0)
- { LogMsg("ERROR: handle_regservice_request - Couldn't read name/regtype/domain"); return(mStatus_BadParamErr); }
-
- request->flags = flags;
- request->u.servicereg.InterfaceID = InterfaceID;
- request->u.servicereg.instances = NULL;
- request->u.servicereg.txtlen = 0;
- request->u.servicereg.txtdata = NULL;
- mDNSPlatformStrCopy(request->u.servicereg.type_as_string, type_as_string);
-
- if (request->msgptr + 2 > request->msgend) request->msgptr = NULL;
- else
- {
- request->u.servicereg.port.b[0] = *request->msgptr++;
- request->u.servicereg.port.b[1] = *request->msgptr++;
- }
-
- request->u.servicereg.txtlen = get_uint16(&request->msgptr, request->msgend);
- if (request->u.servicereg.txtlen)
- {
- request->u.servicereg.txtdata = mallocL("service_info txtdata", request->u.servicereg.txtlen);
- if (!request->u.servicereg.txtdata) FatalError("ERROR: handle_regservice_request - malloc");
- mDNSPlatformMemCopy(request->u.servicereg.txtdata, get_rdata(&request->msgptr, request->msgend, request->u.servicereg.txtlen), request->u.servicereg.txtlen);
- }
-
- if (!request->msgptr) { LogMsg("%3d: DNSServiceRegister(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
-
- // Check for sub-types after the service type
- request->u.servicereg.num_subtypes = ChopSubTypes(request->u.servicereg.type_as_string); // Note: Modifies regtype string to remove trailing subtypes
- if (request->u.servicereg.num_subtypes < 0)
- { LogMsg("ERROR: handle_regservice_request - ChopSubTypes failed %s", request->u.servicereg.type_as_string); return(mStatus_BadParamErr); }
-
- // Don't try to construct "domainname t" until *after* ChopSubTypes has worked its magic
- if (!*request->u.servicereg.type_as_string || !MakeDomainNameFromDNSNameString(&request->u.servicereg.type, request->u.servicereg.type_as_string))
- { LogMsg("ERROR: handle_regservice_request - type_as_string bad %s", request->u.servicereg.type_as_string); return(mStatus_BadParamErr); }
-
- if (!name[0])
- {
- request->u.servicereg.name = mDNSStorage.nicelabel;
- request->u.servicereg.autoname = mDNStrue;
- }
- else
- {
- // If the client is allowing AutoRename, then truncate name to legal length before converting it to a DomainLabel
- if ((flags & kDNSServiceFlagsNoAutoRename) == 0)
- {
- int newlen = TruncateUTF8ToLength((mDNSu8*)name, mDNSPlatformStrLen(name), MAX_DOMAIN_LABEL);
- name[newlen] = 0;
- }
- if (!MakeDomainLabelFromLiteralString(&request->u.servicereg.name, name))
- { LogMsg("ERROR: handle_regservice_request - name bad %s", name); return(mStatus_BadParamErr); }
- request->u.servicereg.autoname = mDNSfalse;
- }
-
- if (*domain)
- {
- request->u.servicereg.default_domain = mDNSfalse;
- if (!MakeDomainNameFromDNSNameString(&d, domain))
- { LogMsg("ERROR: handle_regservice_request - domain bad %s", domain); return(mStatus_BadParamErr); }
- }
- else
- {
- request->u.servicereg.default_domain = mDNStrue;
- MakeDomainNameFromDNSNameString(&d, "local.");
- }
-
- if (!ConstructServiceName(&srv, &request->u.servicereg.name, &request->u.servicereg.type, &d))
- {
- LogMsg("ERROR: handle_regservice_request - Couldn't ConstructServiceName from, '%#s' '%##s' '%##s'",
- request->u.servicereg.name.c, request->u.servicereg.type.c, d.c); return(mStatus_BadParamErr);
- }
-
- if (!MakeDomainNameFromDNSNameString(&request->u.servicereg.host, host))
- { LogMsg("ERROR: handle_regservice_request - host bad %s", host); return(mStatus_BadParamErr); }
- request->u.servicereg.autorename = (flags & kDNSServiceFlagsNoAutoRename ) == 0;
- request->u.servicereg.allowremotequery = (flags & kDNSServiceFlagsAllowRemoteQuery) != 0;
-
- // Some clients use mDNS for lightweight copy protection, registering a pseudo-service with
- // a port number of zero. When two instances of the protected client are allowed to run on one
- // machine, we don't want to see misleading "Bogus client" messages in syslog and the console.
- if (!mDNSIPPortIsZero(request->u.servicereg.port))
- {
- int count = CountExistingRegistrations(&srv, request->u.servicereg.port);
- if (count)
- LogMsg("Client application registered %d identical instances of service %##s port %u.",
- count+1, srv.c, mDNSVal16(request->u.servicereg.port));
- }
-
- LogOperation("%3d: DNSServiceRegister(%X, %d, \"%s\", \"%s\", \"%s\", \"%s\", %u) START",
- request->sd, flags, interfaceIndex, name, request->u.servicereg.type_as_string, domain, host, mDNSVal16(request->u.servicereg.port));
-
- // We need to unconditionally set request->terminate, because even if we didn't successfully
- // start any registrations right now, subsequent configuration changes may cause successful
- // registrations to be added, and we'll need to cancel them before freeing this memory.
- // We also need to set request->terminate first, before adding additional service instances,
- // because the uds_validatelists uses the request->terminate function pointer to determine
- // what kind of request this is, and therefore what kind of list validation is required.
- request->terminate = regservice_termination_callback;
-
- err = register_service_instance(request, &d);
-
-#if 0
- err = AuthorizedDomain(request, &d, AutoRegistrationDomains) ? register_service_instance(request, &d) : mStatus_NoError;
-#endif
- if (!err)
- {
- if (request->u.servicereg.autoname) UpdateDeviceInfoRecord(&mDNSStorage);
-
- if (!*domain)
- {
- DNameListElem *ptr;
- // Note that we don't report errors for non-local, non-explicit domains
- for (ptr = AutoRegistrationDomains; ptr; ptr = ptr->next)
- if (!ptr->uid || SystemUID(request->uid) || request->uid == ptr->uid)
- register_service_instance(request, &ptr->name);
- }
- }
-
- return(err);
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - DNSServiceBrowse
-#endif
-
-mDNSlocal void FoundInstance(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord)
- {
- const DNSServiceFlags flags = AddRecord ? kDNSServiceFlagsAdd : 0;
- request_state *req = question->QuestionContext;
- reply_state *rep;
- (void)m; // Unused
-
- if (answer->rrtype != kDNSType_PTR)
- { LogMsg("%3d: FoundInstance: Should not be called with rrtype %d (not a PTR record)", req->sd, answer->rrtype); return; }
-
- if (GenerateNTDResponse(&answer->rdata->u.name, answer->InterfaceID, req, &rep, browse_reply_op, flags, mStatus_NoError) != mStatus_NoError)
- {
- if (SameDomainName(&req->u.browser.regtype, (const domainname*)"\x09_services\x07_dns-sd\x04_udp"))
- {
- // Special support to enable the DNSServiceBrowse call made by Bonjour Browser
- // Remove after Bonjour Browser is updated to use DNSServiceQueryRecord instead of DNSServiceBrowse
- GenerateBonjourBrowserResponse(&answer->rdata->u.name, answer->InterfaceID, req, &rep, browse_reply_op, flags, mStatus_NoError);
- goto bonjourbrowserhack;
- }
-
- LogMsg("%3d: FoundInstance: %##s PTR %##s received from network is not valid DNS-SD service pointer",
- req->sd, answer->name->c, answer->rdata->u.name.c);
- return;
- }
-
-bonjourbrowserhack:
-
- LogOperation("%3d: DNSServiceBrowse(%##s, %s) RESULT %s %d: %s",
- req->sd, question->qname.c, DNSTypeName(question->qtype), AddRecord ? "Add" : "Rmv",
- mDNSPlatformInterfaceIndexfromInterfaceID(m, answer->InterfaceID, mDNSfalse), RRDisplayString(m, answer));
-
- append_reply(req, rep);
- }
-
-mDNSlocal mStatus add_domain_to_browser(request_state *info, const domainname *d)
- {
- browser_t *b, *p;
- mStatus err;
-
- for (p = info->u.browser.browsers; p; p = p->next)
- {
- if (SameDomainName(&p->domain, d))
- { debugf("add_domain_to_browser %##s already in list", d->c); return mStatus_AlreadyRegistered; }
- }
-
- b = mallocL("browser_t", sizeof(*b));
- if (!b) return mStatus_NoMemoryErr;
- AssignDomainName(&b->domain, d);
- err = mDNS_StartBrowse(&mDNSStorage, &b->q,
- &info->u.browser.regtype, d, info->u.browser.interface_id, info->u.browser.ForceMCast, FoundInstance, info);
- if (err)
- {
- LogMsg("mDNS_StartBrowse returned %d for type %##s domain %##s", err, info->u.browser.regtype.c, d->c);
- freeL("browser_t/add_domain_to_browser", b);
- }
- else
- {
- b->next = info->u.browser.browsers;
- info->u.browser.browsers = b;
- LogOperation("%3d: DNSServiceBrowse(%##s) START", info->sd, b->q.qname.c);
- if (info->u.browser.interface_id == mDNSInterface_P2P || (!info->u.browser.interface_id && SameDomainName(&b->domain, &localdomain) && (info->flags & kDNSServiceFlagsIncludeP2P)))
- {
- domainname tmp;
- ConstructServiceName(&tmp, NULL, &info->u.browser.regtype, &b->domain);
- LogInfo("add_domain_to_browser: calling external_start_browsing_for_service()");
- external_start_browsing_for_service(&mDNSStorage, &tmp, kDNSType_PTR);
- }
- }
- return err;
- }
-
-mDNSlocal void browse_termination_callback(request_state *info)
- {
- while (info->u.browser.browsers)
- {
- browser_t *ptr = info->u.browser.browsers;
-
- if (info->u.browser.interface_id == mDNSInterface_P2P || (!info->u.browser.interface_id && SameDomainName(&ptr->domain, &localdomain) && (info->flags & kDNSServiceFlagsIncludeP2P)))
- {
- domainname tmp;
- ConstructServiceName(&tmp, NULL, &info->u.browser.regtype, &ptr->domain);
- LogInfo("browse_termination_callback: calling external_stop_browsing_for_service()");
- external_stop_browsing_for_service(&mDNSStorage, &tmp, kDNSType_PTR);
- }
-
- info->u.browser.browsers = ptr->next;
- LogOperation("%3d: DNSServiceBrowse(%##s) STOP", info->sd, ptr->q.qname.c);
- mDNS_StopBrowse(&mDNSStorage, &ptr->q); // no need to error-check result
- freeL("browser_t/browse_termination_callback", ptr);
- }
- }
-
-mDNSlocal void udsserver_automatic_browse_domain_changed(const DNameListElem *const d, const mDNSBool add)
- {
- request_state *request;
- debugf("udsserver_automatic_browse_domain_changed: %s default browse domain %##s", add ? "Adding" : "Removing", d->name.c);
-
-#if APPLE_OSX_mDNSResponder
- machserver_automatic_browse_domain_changed(&d->name, add);
-#endif // APPLE_OSX_mDNSResponder
-
- for (request = all_requests; request; request = request->next)
- {
- if (request->terminate != browse_termination_callback) continue; // Not a browse operation
- if (!request->u.browser.default_domain) continue; // Not an auto-browse operation
- if (!d->uid || SystemUID(request->uid) || request->uid == d->uid)
- {
- browser_t **ptr = &request->u.browser.browsers;
- while (*ptr && !SameDomainName(&(*ptr)->domain, &d->name)) ptr = &(*ptr)->next;
- if (add)
- {
- // If we don't already have this domain in our list for this browse operation, add it now
- if (!*ptr) add_domain_to_browser(request, &d->name);
- else debugf("udsserver_automatic_browse_domain_changed %##s already in list, not re-adding", &d->name);
- }
- else
- {
- if (!*ptr) LogMsg("udsserver_automatic_browse_domain_changed ERROR %##s not found", &d->name);
- else
- {
- DNameListElem *p;
- for (p = AutoBrowseDomains; p; p=p->next)
- if (!p->uid || SystemUID(request->uid) || request->uid == p->uid)
- if (SameDomainName(&d->name, &p->name)) break;
- if (p) debugf("udsserver_automatic_browse_domain_changed %##s still in list, not removing", &d->name);
- else
- {
- browser_t *rem = *ptr;
- *ptr = (*ptr)->next;
- mDNS_StopQueryWithRemoves(&mDNSStorage, &rem->q);
- freeL("browser_t/udsserver_automatic_browse_domain_changed", rem);
- }
- }
- }
- }
- }
- }
-
-mDNSlocal void FreeARElemCallback(mDNS *const m, AuthRecord *const rr, mStatus result)
- {
- (void)m; // unused
- if (result == mStatus_MemFree)
- {
- // On shutdown, mDNS_Close automatically deregisters all records
- // Since in this case no one has called DeregisterLocalOnlyDomainEnumPTR to cut the record
- // from the LocalDomainEnumRecords list, we do this here before we free the memory.
- // (This should actually no longer be necessary, now that we do the proper cleanup in
- // udsserver_exit. To confirm this, we'll log an error message if we do find a record that
- // hasn't been cut from the list yet. If these messages don't appear, we can delete this code.)
- ARListElem **ptr = &LocalDomainEnumRecords;
- while (*ptr && &(*ptr)->ar != rr) ptr = &(*ptr)->next;
- if (*ptr) { *ptr = (*ptr)->next; LogMsg("FreeARElemCallback: Have to cut %s", ARDisplayString(m, rr)); }
- mDNSPlatformMemFree(rr->RecordContext);
- }
- }
-
-// RegisterLocalOnlyDomainEnumPTR and DeregisterLocalOnlyDomainEnumPTR largely duplicate code in
-// "FoundDomain" in uDNS.c for creating and destroying these special mDNSInterface_LocalOnly records.
-// We may want to turn the common code into a subroutine.
-
-mDNSlocal void RegisterLocalOnlyDomainEnumPTR(mDNS *m, const domainname *d, int type)
- {
- // allocate/register legacy and non-legacy _browse PTR record
- mStatus err;
- ARListElem *ptr = mDNSPlatformMemAllocate(sizeof(*ptr));
-
- debugf("Incrementing %s refcount for %##s",
- (type == mDNS_DomainTypeBrowse ) ? "browse domain " :
- (type == mDNS_DomainTypeRegistration ) ? "registration dom" :
- (type == mDNS_DomainTypeBrowseAutomatic) ? "automatic browse" : "?", d->c);
-
- mDNS_SetupResourceRecord(&ptr->ar, mDNSNULL, mDNSInterface_LocalOnly, kDNSType_PTR, 7200, kDNSRecordTypeShared, AuthRecordLocalOnly, FreeARElemCallback, ptr);
- MakeDomainNameFromDNSNameString(&ptr->ar.namestorage, mDNS_DomainTypeNames[type]);
- AppendDNSNameString (&ptr->ar.namestorage, "local");
- AssignDomainName(&ptr->ar.resrec.rdata->u.name, d);
- err = mDNS_Register(m, &ptr->ar);
- if (err)
- {
- LogMsg("SetSCPrefsBrowseDomain: mDNS_Register returned error %d", err);
- mDNSPlatformMemFree(ptr);
- }
- else
- {
- ptr->next = LocalDomainEnumRecords;
- LocalDomainEnumRecords = ptr;
- }
- }
-
-mDNSlocal void DeregisterLocalOnlyDomainEnumPTR(mDNS *m, const domainname *d, int type)
- {
- ARListElem **ptr = &LocalDomainEnumRecords;
- domainname lhs; // left-hand side of PTR, for comparison
-
- debugf("Decrementing %s refcount for %##s",
- (type == mDNS_DomainTypeBrowse ) ? "browse domain " :
- (type == mDNS_DomainTypeRegistration ) ? "registration dom" :
- (type == mDNS_DomainTypeBrowseAutomatic) ? "automatic browse" : "?", d->c);
-
- MakeDomainNameFromDNSNameString(&lhs, mDNS_DomainTypeNames[type]);
- AppendDNSNameString (&lhs, "local");
-
- while (*ptr)
- {
- if (SameDomainName(&(*ptr)->ar.resrec.rdata->u.name, d) && SameDomainName((*ptr)->ar.resrec.name, &lhs))
- {
- ARListElem *rem = *ptr;
- *ptr = (*ptr)->next;
- mDNS_Deregister(m, &rem->ar);
- return;
- }
- else ptr = &(*ptr)->next;
- }
- }
-
-mDNSlocal void AddAutoBrowseDomain(const mDNSu32 uid, const domainname *const name)
- {
- DNameListElem *new = mDNSPlatformMemAllocate(sizeof(DNameListElem));
- if (!new) { LogMsg("ERROR: malloc"); return; }
- AssignDomainName(&new->name, name);
- new->uid = uid;
- new->next = AutoBrowseDomains;
- AutoBrowseDomains = new;
- udsserver_automatic_browse_domain_changed(new, mDNStrue);
- }
-
-mDNSlocal void RmvAutoBrowseDomain(const mDNSu32 uid, const domainname *const name)
- {
- DNameListElem **p = &AutoBrowseDomains;
- while (*p && (!SameDomainName(&(*p)->name, name) || (*p)->uid != uid)) p = &(*p)->next;
- if (!*p) LogMsg("RmvAutoBrowseDomain: Got remove event for domain %##s not in list", name->c);
- else
- {
- DNameListElem *ptr = *p;
- *p = ptr->next;
- udsserver_automatic_browse_domain_changed(ptr, mDNSfalse);
- mDNSPlatformMemFree(ptr);
- }
- }
-
-mDNSlocal void SetPrefsBrowseDomains(mDNS *m, DNameListElem *browseDomains, mDNSBool add)
- {
- DNameListElem *d;
- for (d = browseDomains; d; d = d->next)
- {
- if (add)
- {
- RegisterLocalOnlyDomainEnumPTR(m, &d->name, mDNS_DomainTypeBrowse);
- AddAutoBrowseDomain(d->uid, &d->name);
- }
- else
- {
- DeregisterLocalOnlyDomainEnumPTR(m, &d->name, mDNS_DomainTypeBrowse);
- RmvAutoBrowseDomain(d->uid, &d->name);
- }
- }
- }
-
-mDNSlocal void UpdateDeviceInfoRecord(mDNS *const m)
- {
- int num_autoname = 0;
- request_state *req;
- for (req = all_requests; req; req = req->next)
- if (req->terminate == regservice_termination_callback && req->u.servicereg.autoname)
- num_autoname++;
-
- // If DeviceInfo record is currently registered, see if we need to deregister it
- if (m->DeviceInfo.resrec.RecordType != kDNSRecordTypeUnregistered)
- if (num_autoname == 0 || !SameDomainLabelCS(m->DeviceInfo.resrec.name->c, m->nicelabel.c))
- {
- LogOperation("UpdateDeviceInfoRecord Deregister %##s", m->DeviceInfo.resrec.name);
- mDNS_Deregister(m, &m->DeviceInfo);
- }
-
- // If DeviceInfo record is not currently registered, see if we need to register it
- if (m->DeviceInfo.resrec.RecordType == kDNSRecordTypeUnregistered)
- if (num_autoname > 0)
- {
- mDNSu8 len = m->HIHardware.c[0] < 255 - 6 ? m->HIHardware.c[0] : 255 - 6;
- mDNS_SetupResourceRecord(&m->DeviceInfo, mDNSNULL, mDNSNULL, kDNSType_TXT, kStandardTTL, kDNSRecordTypeAdvisory, AuthRecordAny, mDNSNULL, mDNSNULL);
- ConstructServiceName(&m->DeviceInfo.namestorage, &m->nicelabel, &DeviceInfoName, &localdomain);
- mDNSPlatformMemCopy(m->DeviceInfo.resrec.rdata->u.data + 1, "model=", 6);
- mDNSPlatformMemCopy(m->DeviceInfo.resrec.rdata->u.data + 7, m->HIHardware.c + 1, len);
- m->DeviceInfo.resrec.rdata->u.data[0] = 6 + len; // "model=" plus the device string
- m->DeviceInfo.resrec.rdlength = 7 + len; // One extra for the length byte at the start of the string
- LogOperation("UpdateDeviceInfoRecord Register %##s", m->DeviceInfo.resrec.name);
- mDNS_Register(m, &m->DeviceInfo);
- }
- }
-
-mDNSexport void udsserver_handle_configchange(mDNS *const m)
- {
- request_state *req;
- service_instance *ptr;
- DNameListElem *RegDomains = NULL;
- DNameListElem *BrowseDomains = NULL;
- DNameListElem *p;
-
- UpdateDeviceInfoRecord(m);
-
- // For autoname services, see if the default service name has changed, necessitating an automatic update
- for (req = all_requests; req; req = req->next)
- if (req->terminate == regservice_termination_callback)
- if (req->u.servicereg.autoname && !SameDomainLabelCS(req->u.servicereg.name.c, m->nicelabel.c))
- {
- req->u.servicereg.name = m->nicelabel;
- for (ptr = req->u.servicereg.instances; ptr; ptr = ptr->next)
- {
- ptr->renameonmemfree = 1;
- if (ptr->clientnotified) SendServiceRemovalNotification(&ptr->srs);
- LogInfo("udsserver_handle_configchange: Calling deregister for Service %##s", ptr->srs.RR_PTR.resrec.name->c);
- if (mDNS_DeregisterService_drt(m, &ptr->srs, mDNS_Dereg_rapid))
- regservice_callback(m, &ptr->srs, mStatus_MemFree); // If service deregistered already, we can re-register immediately
- }
- }
-
- // Let the platform layer get the current DNS information
- mDNS_Lock(m);
- mDNSPlatformSetDNSConfig(m, mDNSfalse, mDNSfalse, mDNSNULL, &RegDomains, &BrowseDomains);
- mDNS_Unlock(m);
-
- // Any automatic registration domains are also implicitly automatic browsing domains
- if (RegDomains) SetPrefsBrowseDomains(m, RegDomains, mDNStrue); // Add the new list first
- if (AutoRegistrationDomains) SetPrefsBrowseDomains(m, AutoRegistrationDomains, mDNSfalse); // Then clear the old list
-
- // Add any new domains not already in our AutoRegistrationDomains list
- for (p=RegDomains; p; p=p->next)
- {
- DNameListElem **pp = &AutoRegistrationDomains;
- while (*pp && ((*pp)->uid != p->uid || !SameDomainName(&(*pp)->name, &p->name))) pp = &(*pp)->next;
- if (!*pp) // If not found in our existing list, this is a new default registration domain
- {
- RegisterLocalOnlyDomainEnumPTR(m, &p->name, mDNS_DomainTypeRegistration);
- udsserver_default_reg_domain_changed(p, mDNStrue);
- }
- else // else found same domainname in both old and new lists, so no change, just delete old copy
- {
- DNameListElem *del = *pp;
- *pp = (*pp)->next;
- mDNSPlatformMemFree(del);
- }
- }
-
- // Delete any domains in our old AutoRegistrationDomains list that are now gone
- while (AutoRegistrationDomains)
- {
- DNameListElem *del = AutoRegistrationDomains;
- AutoRegistrationDomains = AutoRegistrationDomains->next; // Cut record from list FIRST,
- DeregisterLocalOnlyDomainEnumPTR(m, &del->name, mDNS_DomainTypeRegistration);
- udsserver_default_reg_domain_changed(del, mDNSfalse); // before calling udsserver_default_reg_domain_changed()
- mDNSPlatformMemFree(del);
- }
-
- // Now we have our new updated automatic registration domain list
- AutoRegistrationDomains = RegDomains;
-
- // Add new browse domains to internal list
- if (BrowseDomains) SetPrefsBrowseDomains(m, BrowseDomains, mDNStrue);
-
- // Remove old browse domains from internal list
- if (SCPrefBrowseDomains)
- {
- SetPrefsBrowseDomains(m, SCPrefBrowseDomains, mDNSfalse);
- while (SCPrefBrowseDomains)
- {
- DNameListElem *fptr = SCPrefBrowseDomains;
- SCPrefBrowseDomains = SCPrefBrowseDomains->next;
- mDNSPlatformMemFree(fptr);
- }
- }
-
- // Replace the old browse domains array with the new array
- SCPrefBrowseDomains = BrowseDomains;
- }
-
-mDNSlocal void AutomaticBrowseDomainChange(mDNS *const m, DNSQuestion *q, const ResourceRecord *const answer, QC_result AddRecord)
- {
- (void)m; // unused;
- (void)q; // unused
-
- LogOperation("AutomaticBrowseDomainChange: %s automatic browse domain %##s",
- AddRecord ? "Adding" : "Removing", answer->rdata->u.name.c);
-
- if (AddRecord) AddAutoBrowseDomain(0, &answer->rdata->u.name);
- else RmvAutoBrowseDomain(0, &answer->rdata->u.name);
- }
-
-mDNSlocal mStatus handle_browse_request(request_state *request)
- {
- char regtype[MAX_ESCAPED_DOMAIN_NAME], domain[MAX_ESCAPED_DOMAIN_NAME];
- domainname typedn, d, temp;
- mDNSs32 NumSubTypes;
- mStatus err = mStatus_NoError;
-
- DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend);
- mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend);
- mDNSInterfaceID InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex);
- if (interfaceIndex && !InterfaceID) return(mStatus_BadParamErr);
-
- if (get_string(&request->msgptr, request->msgend, regtype, MAX_ESCAPED_DOMAIN_NAME) < 0 ||
- get_string(&request->msgptr, request->msgend, domain, MAX_ESCAPED_DOMAIN_NAME) < 0) return(mStatus_BadParamErr);
-
- if (!request->msgptr) { LogMsg("%3d: DNSServiceBrowse(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
-
- if (domain[0] == '\0') uDNS_SetupSearchDomains(&mDNSStorage, UDNS_START_WAB_QUERY);
-
- request->flags = flags;
- typedn.c[0] = 0;
- NumSubTypes = ChopSubTypes(regtype); // Note: Modifies regtype string to remove trailing subtypes
- if (NumSubTypes < 0 || NumSubTypes > 1) return(mStatus_BadParamErr);
- if (NumSubTypes == 1 && !AppendDNSNameString(&typedn, regtype + strlen(regtype) + 1)) return(mStatus_BadParamErr);
-
- if (!regtype[0] || !AppendDNSNameString(&typedn, regtype)) return(mStatus_BadParamErr);
-
- if (!MakeDomainNameFromDNSNameString(&temp, regtype)) return(mStatus_BadParamErr);
- // For over-long service types, we only allow domain "local"
- if (temp.c[0] > 15 && domain[0] == 0) mDNSPlatformStrCopy(domain, "local.");
-
- // Set up browser info
- request->u.browser.ForceMCast = (flags & kDNSServiceFlagsForceMulticast) != 0;
- request->u.browser.interface_id = InterfaceID;
- AssignDomainName(&request->u.browser.regtype, &typedn);
- request->u.browser.default_domain = !domain[0];
- request->u.browser.browsers = NULL;
-
- LogOperation("%3d: DNSServiceBrowse(%X, %d, \"%##s\", \"%s\") START",
- request->sd, request->flags, interfaceIndex, request->u.browser.regtype.c, domain);
-
- // We need to unconditionally set request->terminate, because even if we didn't successfully
- // start any browses right now, subsequent configuration changes may cause successful
- // browses to be added, and we'll need to cancel them before freeing this memory.
- request->terminate = browse_termination_callback;
-
- if (domain[0])
- {
- if (!MakeDomainNameFromDNSNameString(&d, domain)) return(mStatus_BadParamErr);
- err = add_domain_to_browser(request, &d);
-#if 0
- err = AuthorizedDomain(request, &d, AutoBrowseDomains) ? add_domain_to_browser(request, &d) : mStatus_NoError;
-#endif
- }
- else
- {
- DNameListElem *sdom;
- for (sdom = AutoBrowseDomains; sdom; sdom = sdom->next)
- if (!sdom->uid || SystemUID(request->uid) || request->uid == sdom->uid)
- {
- err = add_domain_to_browser(request, &sdom->name);
- if (err)
- {
- if (SameDomainName(&sdom->name, &localdomain)) break;
- else err = mStatus_NoError; // suppress errors for non-local "default" domains
- }
- }
- }
-
- return(err);
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - DNSServiceResolve
-#endif
-
-mDNSlocal void resolve_result_callback(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord)
- {
- size_t len = 0;
- char fullname[MAX_ESCAPED_DOMAIN_NAME], target[MAX_ESCAPED_DOMAIN_NAME];
- char *data;
- reply_state *rep;
- request_state *req = question->QuestionContext;
- (void)m; // Unused
-
- LogOperation("%3d: DNSServiceResolve(%##s) %s %s", req->sd, question->qname.c, AddRecord ? "ADD" : "RMV", RRDisplayString(m, answer));
-
- if (!AddRecord)
- {
- if (req->u.resolve.srv == answer) req->u.resolve.srv = mDNSNULL;
- if (req->u.resolve.txt == answer) req->u.resolve.txt = mDNSNULL;
- return;
- }
-
- if (answer->rrtype == kDNSType_SRV) req->u.resolve.srv = answer;
- if (answer->rrtype == kDNSType_TXT) req->u.resolve.txt = answer;
-
- if (!req->u.resolve.txt || !req->u.resolve.srv) return; // only deliver result to client if we have both answers
-
- ConvertDomainNameToCString(answer->name, fullname);
- ConvertDomainNameToCString(&req->u.resolve.srv->rdata->u.srv.target, target);
-
- // calculate reply length
- len += sizeof(DNSServiceFlags);
- len += sizeof(mDNSu32); // interface index
- len += sizeof(DNSServiceErrorType);
- len += strlen(fullname) + 1;
- len += strlen(target) + 1;
- len += 2 * sizeof(mDNSu16); // port, txtLen
- len += req->u.resolve.txt->rdlength;
-
- // allocate/init reply header
- rep = create_reply(resolve_reply_op, len, req);
- rep->rhdr->flags = dnssd_htonl(0);
- rep->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(m, answer->InterfaceID, mDNSfalse));
- rep->rhdr->error = dnssd_htonl(kDNSServiceErr_NoError);
-
- data = (char *)&rep->rhdr[1];
-
- // write reply data to message
- put_string(fullname, &data);
- put_string(target, &data);
- *data++ = req->u.resolve.srv->rdata->u.srv.port.b[0];
- *data++ = req->u.resolve.srv->rdata->u.srv.port.b[1];
- put_uint16(req->u.resolve.txt->rdlength, &data);
- put_rdata (req->u.resolve.txt->rdlength, req->u.resolve.txt->rdata->u.data, &data);
-
- LogOperation("%3d: DNSServiceResolve(%s) RESULT %s:%d", req->sd, fullname, target, mDNSVal16(req->u.resolve.srv->rdata->u.srv.port));
- append_reply(req, rep);
- }
-
-mDNSlocal void resolve_termination_callback(request_state *request)
- {
- LogOperation("%3d: DNSServiceResolve(%##s) STOP", request->sd, request->u.resolve.qtxt.qname.c);
- mDNS_StopQuery(&mDNSStorage, &request->u.resolve.qtxt);
- mDNS_StopQuery(&mDNSStorage, &request->u.resolve.qsrv);
- if (request->u.resolve.external_advertise) external_stop_resolving_service(&request->u.resolve.qsrv.qname);
- }
-
-mDNSlocal mStatus handle_resolve_request(request_state *request)
- {
- char name[256], regtype[MAX_ESCAPED_DOMAIN_NAME], domain[MAX_ESCAPED_DOMAIN_NAME];
- domainname fqdn;
- mStatus err;
-
- // extract the data from the message
- DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend);
- mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend);
- mDNSInterfaceID InterfaceID;
- mDNSBool wasP2P = (interfaceIndex == kDNSServiceInterfaceIndexP2P);
-
-
- request->flags = flags;
- if (wasP2P) interfaceIndex = kDNSServiceInterfaceIndexAny;
-
- InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex);
- if (interfaceIndex && !InterfaceID)
- { LogMsg("ERROR: handle_resolve_request bad interfaceIndex %d", interfaceIndex); return(mStatus_BadParamErr); }
-
- if (get_string(&request->msgptr, request->msgend, name, 256) < 0 ||
- get_string(&request->msgptr, request->msgend, regtype, MAX_ESCAPED_DOMAIN_NAME) < 0 ||
- get_string(&request->msgptr, request->msgend, domain, MAX_ESCAPED_DOMAIN_NAME) < 0)
- { LogMsg("ERROR: handle_resolve_request - Couldn't read name/regtype/domain"); return(mStatus_BadParamErr); }
-
- if (!request->msgptr) { LogMsg("%3d: DNSServiceResolve(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
-
- if (build_domainname_from_strings(&fqdn, name, regtype, domain) < 0)
- { LogMsg("ERROR: handle_resolve_request bad '%s' '%s' '%s'", name, regtype, domain); return(mStatus_BadParamErr); }
-
- mDNSPlatformMemZero(&request->u.resolve, sizeof(request->u.resolve));
-
- // format questions
- request->u.resolve.qsrv.InterfaceID = InterfaceID;
- request->u.resolve.qsrv.Target = zeroAddr;
- AssignDomainName(&request->u.resolve.qsrv.qname, &fqdn);
- request->u.resolve.qsrv.qtype = kDNSType_SRV;
- request->u.resolve.qsrv.qclass = kDNSClass_IN;
- request->u.resolve.qsrv.LongLived = (flags & kDNSServiceFlagsLongLivedQuery ) != 0;
- request->u.resolve.qsrv.ExpectUnique = mDNStrue;
- request->u.resolve.qsrv.ForceMCast = (flags & kDNSServiceFlagsForceMulticast ) != 0;
- request->u.resolve.qsrv.ReturnIntermed = (flags & kDNSServiceFlagsReturnIntermediates) != 0;
- request->u.resolve.qsrv.SuppressUnusable = mDNSfalse;
- request->u.resolve.qsrv.SearchListIndex = 0;
- request->u.resolve.qsrv.AppendSearchDomains = 0;
- request->u.resolve.qsrv.RetryWithSearchDomains = mDNSfalse;
- request->u.resolve.qsrv.TimeoutQuestion = 0;
- request->u.resolve.qsrv.WakeOnResolve = (flags & kDNSServiceFlagsWakeOnResolve) != 0;
- request->u.resolve.qsrv.qnameOrig = mDNSNULL;
- request->u.resolve.qsrv.QuestionCallback = resolve_result_callback;
- request->u.resolve.qsrv.QuestionContext = request;
-
- request->u.resolve.qtxt.InterfaceID = InterfaceID;
- request->u.resolve.qtxt.Target = zeroAddr;
- AssignDomainName(&request->u.resolve.qtxt.qname, &fqdn);
- request->u.resolve.qtxt.qtype = kDNSType_TXT;
- request->u.resolve.qtxt.qclass = kDNSClass_IN;
- request->u.resolve.qtxt.LongLived = (flags & kDNSServiceFlagsLongLivedQuery ) != 0;
- request->u.resolve.qtxt.ExpectUnique = mDNStrue;
- request->u.resolve.qtxt.ForceMCast = (flags & kDNSServiceFlagsForceMulticast ) != 0;
- request->u.resolve.qtxt.ReturnIntermed = (flags & kDNSServiceFlagsReturnIntermediates) != 0;
- request->u.resolve.qtxt.SuppressUnusable = mDNSfalse;
- request->u.resolve.qtxt.SearchListIndex = 0;
- request->u.resolve.qtxt.AppendSearchDomains = 0;
- request->u.resolve.qtxt.RetryWithSearchDomains = mDNSfalse;
- request->u.resolve.qtxt.TimeoutQuestion = 0;
- request->u.resolve.qtxt.WakeOnResolve = 0;
- request->u.resolve.qtxt.qnameOrig = mDNSNULL;
- request->u.resolve.qtxt.QuestionCallback = resolve_result_callback;
- request->u.resolve.qtxt.QuestionContext = request;
-
- request->u.resolve.ReportTime = NonZeroTime(mDNS_TimeNow(&mDNSStorage) + 130 * mDNSPlatformOneSecond);
-
- request->u.resolve.external_advertise = mDNSfalse;
-
-#if 0
- if (!AuthorizedDomain(request, &fqdn, AutoBrowseDomains)) return(mStatus_NoError);
-#endif
-
- // ask the questions
- LogOperation("%3d: DNSServiceResolve(%##s) START", request->sd, request->u.resolve.qsrv.qname.c);
- err = mDNS_StartQuery(&mDNSStorage, &request->u.resolve.qsrv);
- if (!err)
- {
- err = mDNS_StartQuery(&mDNSStorage, &request->u.resolve.qtxt);
- if (err) mDNS_StopQuery(&mDNSStorage, &request->u.resolve.qsrv);
- else
- {
- request->terminate = resolve_termination_callback;
- // If the user explicitly passed in P2P, we don't restrict the domain in which we resolve.
- if (wasP2P || (!InterfaceID && IsLocalDomain(&fqdn) && (request->flags & kDNSServiceFlagsIncludeP2P)))
- {
- request->u.resolve.external_advertise = mDNStrue;
- LogInfo("handle_resolve_request: calling external_start_resolving_service()");
- external_start_resolving_service(&fqdn);
- }
- }
- }
-
- return(err);
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - DNSServiceQueryRecord
-#endif
-
-// mDNS operation functions. Each operation has 3 associated functions - a request handler that parses
-// the client's request and makes the appropriate mDNSCore call, a result handler (passed as a callback
-// to the mDNSCore routine) that sends results back to the client, and a termination routine that aborts
-// the mDNSCore operation if the client dies or closes its socket.
-
-// Returns -1 to tell the caller that it should not try to reissue the query anymore
-// Returns 1 on successfully appending a search domain and the caller should reissue the new query
-// Returns 0 when there are no more search domains and the caller should reissue the query
-mDNSlocal int AppendNewSearchDomain(mDNS *const m, DNSQuestion *question)
- {
- domainname *sd;
- mStatus err;
-
- // Sanity check: The caller already checks this. We use -1 to indicate that we have searched all
- // the domains and should try the single label query directly on the wire.
- if (question->SearchListIndex == -1)
- {
- LogMsg("AppendNewSearchDomain: question %##s (%s) SearchListIndex is -1", question->qname.c, DNSTypeName(question->qtype));
- return -1;
- }
-
- if (!question->AppendSearchDomains)
- {
- LogMsg("AppendNewSearchDomain: question %##s (%s) AppendSearchDoamins is 0", question->qname.c, DNSTypeName(question->qtype));
- return -1;
- }
-
- // Save the original name, before we modify them below.
- if (!question->qnameOrig)
- {
- question->qnameOrig = mallocL("AppendNewSearchDomain", sizeof(domainname));
- if (!question->qnameOrig) { LogMsg("AppendNewSearchDomain: ERROR!! malloc failure"); return -1; }
- question->qnameOrig->c[0] = 0;
- AssignDomainName(question->qnameOrig, &question->qname);
- LogInfo("AppendSearchDomain: qnameOrig %##s", question->qnameOrig->c);
- }
-
- sd = uDNS_GetNextSearchDomain(m, question->InterfaceID, &question->SearchListIndex, !question->AppendLocalSearchDomains);
- // We use -1 to indicate that we have searched all the domains and should try the single label
- // query directly on the wire. uDNS_GetNextSearchDomain should never return a negative value
- if (question->SearchListIndex == -1)
- {
- LogMsg("AppendNewSearchDomain: ERROR!! uDNS_GetNextSearchDomain returned -1");
- return -1;
- }
-
- // Not a common case. Perhaps, we should try the next search domain if it exceeds ?
- if (sd && (DomainNameLength(question->qnameOrig) + DomainNameLength(sd)) > MAX_DOMAIN_NAME)
- {
- LogMsg("AppendNewSearchDomain: ERROR!! exceeding max domain length for %##s (%s) SearchDomain %##s length %d, Question name length %d", question->qnameOrig->c, DNSTypeName(question->qtype), sd->c, DomainNameLength(question->qnameOrig), DomainNameLength(sd));
- return -1;
- }
-
- // if there are no more search domains and we have already tried this question
- // without appending search domains, then we are done.
- if (!sd && !ApplySearchDomainsFirst(question))
- {
- LogInfo("AppnedNewSearchDomain: No more search domains for question with name %##s (%s), not trying anymore", question->qname.c, DNSTypeName(question->qtype));
- return -1;
- }
-
- // Stop the question before changing the name as negative cache entries could be pointing at this question.
- // Even if we don't change the question in the case of returning 0, the caller is going to restart the
- // question.
- err = mDNS_StopQuery(&mDNSStorage, question);
- if (err) { LogMsg("AppendNewSearchDomain: ERROR!! %##s %s mDNS_StopQuery: %d, while retrying with search domains", question->qname.c, DNSTypeName(question->qtype), (int)err); }
-
- AssignDomainName(&question->qname, question->qnameOrig);
- if (sd)
- {
- AppendDomainName(&question->qname, sd);
- LogInfo("AppnedNewSearchDomain: Returning question with name %##s, SearchListIndex %d", question->qname.c, question->SearchListIndex);
- return 1;
- }
-
- // Try the question as single label
- LogInfo("AppnedNewSearchDomain: No more search domains for question with name %##s (%s), trying one last time", question->qname.c, DNSTypeName(question->qtype));
- return 0;
- }
-
-#if APPLE_OSX_mDNSResponder
-
-mDNSlocal mDNSBool DomainInSearchList(domainname *domain)
- {
- const SearchListElem *s;
- for (s=SearchList; s; s=s->next)
- if (SameDomainName(&s->domain, domain)) return mDNStrue;
- return mDNSfalse;
- }
-
-// Workaround for networks using Microsoft Active Directory using "local" as a private internal
-// top-level domain
-mDNSlocal mStatus SendAdditionalQuery(DNSQuestion *q, request_state *request, mStatus err)
- {
- extern domainname ActiveDirectoryPrimaryDomain;
- DNSQuestion **question2;
- #define VALID_MSAD_SRV_TRANSPORT(T) (SameDomainLabel((T)->c, (const mDNSu8 *)"\x4_tcp") || SameDomainLabel((T)->c, (const mDNSu8 *)"\x4_udp"))
- #define VALID_MSAD_SRV(Q) ((Q)->qtype == kDNSType_SRV && VALID_MSAD_SRV_TRANSPORT(SecondLabel(&(Q)->qname)))
-
- question2 = mDNSNULL;
- if (request->hdr.op == query_request)
- question2 = &request->u.queryrecord.q2;
- else if (request->hdr.op == addrinfo_request)
- {
- if (q->qtype == kDNSType_A)
- question2 = &request->u.addrinfo.q42;
- else if (q->qtype == kDNSType_AAAA)
- question2 = &request->u.addrinfo.q62;
- }
- if (!question2)
- {
- LogMsg("SendAdditionalQuery: question2 NULL for %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
- return mStatus_BadParamErr;
- }
-
- // Sanity check: If we already sent an additonal query, we don't need to send one more.
- //
- // 1. When the application calls DNSServiceQueryRecord or DNSServiceGetAddrInfo with a .local name, this function
- // is called to see whether a unicast query should be sent or not.
- //
- // 2. As a result of appending search domains, the question may be end up with a .local suffix even though it
- // was not a .local name to start with. In that case, queryrecord_result_callback calls this function to
- // send the additional query.
- //
- // Thus, it should not be called more than once.
- if (*question2)
- {
- LogInfo("SendAdditionalQuery: question2 already sent for %##s (%s), no more q2", q->qname.c, DNSTypeName(q->qtype));
- return err;
- }
-
- if (!q->ForceMCast && SameDomainLabel(LastLabel(&q->qname), (const mDNSu8 *)&localdomain))
- if (q->qtype == kDNSType_A || q->qtype == kDNSType_AAAA || VALID_MSAD_SRV(q))
- {
- DNSQuestion *q2;
- int labels = CountLabels(&q->qname);
- q2 = mallocL("DNSQuestion", sizeof(DNSQuestion));
- if (!q2) FatalError("ERROR: SendAdditionalQuery malloc");
- *question2 = q2;
- *q2 = *q;
- q2->InterfaceID = mDNSInterface_Unicast;
- q2->ExpectUnique = mDNStrue;
- // If the query starts as a single label e.g., somehost, and we have search domains with .local,
- // queryrecord_result_callback calls this function when .local is appended to "somehost".
- // At that time, the name in "q" is pointing at somehost.local and its qnameOrig pointing at
- // "somehost". We need to copy that information so that when we retry with a different search
- // domain e.g., mycompany.local, we get "somehost.mycompany.local".
- if (q->qnameOrig)
- {
- (*question2)->qnameOrig = mallocL("SendAdditionalQuery", DomainNameLength(q->qnameOrig));
- if (!(*question2)->qnameOrig) { LogMsg("SendAdditionalQuery: ERROR!! malloc failure"); return mStatus_NoMemoryErr; }
- (*question2)->qnameOrig->c[0] = 0;
- AssignDomainName((*question2)->qnameOrig, q->qnameOrig);
- LogInfo("SendAdditionalQuery: qnameOrig %##s", (*question2)->qnameOrig->c);
- }
- // For names of the form "<one-or-more-labels>.bar.local." we always do a second unicast query in parallel.
- // For names of the form "<one-label>.local." it's less clear whether we should do a unicast query.
- // If the name being queried is exactly the same as the name in the DHCP "domain" option (e.g. the DHCP
- // "domain" is my-small-company.local, and the user types "my-small-company.local" into their web browser)
- // then that's a hint that it's worth doing a unicast query. Otherwise, we first check to see if the
- // site's DNS server claims there's an SOA record for "local", and if so, that's also a hint that queries
- // for names in the "local" domain will be safely answered privately before they hit the root name servers.
- // Note that in the "my-small-company.local" example above there will typically be an SOA record for
- // "my-small-company.local" but *not* for "local", which is why the "local SOA" check would fail in that case.
- // We need to check against both ActiveDirectoryPrimaryDomain and SearchList. If it matches against either
- // of those, we don't want do the SOA check for the local
- if (labels == 2 && !SameDomainName(&q->qname, &ActiveDirectoryPrimaryDomain) && !DomainInSearchList(&q->qname))
- {
- AssignDomainName(&q2->qname, &localdomain);
- q2->qtype = kDNSType_SOA;
- q2->LongLived = mDNSfalse;
- q2->ForceMCast = mDNSfalse;
- q2->ReturnIntermed = mDNStrue;
- // Don't append search domains for the .local SOA query
- q2->AppendSearchDomains = 0;
- q2->AppendLocalSearchDomains = 0;
- q2->RetryWithSearchDomains = mDNSfalse;
- q2->SearchListIndex = 0;
- q2->TimeoutQuestion = 0;
- }
- LogOperation("%3d: DNSServiceQueryRecord(%##s, %s) unicast", request->sd, q2->qname.c, DNSTypeName(q2->qtype));
- err = mDNS_StartQuery(&mDNSStorage, q2);
- if (err) LogMsg("%3d: ERROR: DNSServiceQueryRecord %##s %s mDNS_StartQuery: %d", request->sd, q2->qname.c, DNSTypeName(q2->qtype), (int)err);
- }
- return(err);
- }
-#endif // APPLE_OSX_mDNSResponder
-
-// This function tries to append a search domain if valid and possible. If so, returns true.
-mDNSlocal mDNSBool RetryQuestionWithSearchDomains(mDNS *const m, DNSQuestion *question, request_state *req)
- {
- int result;
- // RetryWithSearchDomains tells the core to call us back so that we can retry with search domains if there is no
- // answer in the cache or /etc/hosts. In the first call back from the core, we clear RetryWithSearchDomains so
- // that we don't get called back repeatedly. If we got an answer from the cache or /etc/hosts, we don't touch
- // RetryWithSearchDomains which may or may not be set.
- //
- // If we get e.g., NXDOMAIN and the query is neither suppressed nor exhausted the domain search list and
- // is a valid question for appending search domains, retry by appending domains
-
- if (!question->SuppressQuery && question->SearchListIndex != -1 && question->AppendSearchDomains)
- {
- question->RetryWithSearchDomains = 0;
- result = AppendNewSearchDomain(m, question);
- // As long as the result is either zero or 1, we retry the question. If we exahaust the search
- // domains (result is zero) we try the original query (as it was before appending the search
- // domains) as such on the wire as a last resort if we have not tried them before. For queries
- // with more than one label, we have already tried them before appending search domains and
- // hence don't retry again
- if (result != -1)
- {
- mStatus err;
- err = mDNS_StartQuery(m, question);
- if (!err)
- {
- LogOperation("%3d: RetryQuestionWithSearchDomains(%##s, %s), retrying after appending search domain", req->sd, question->qname.c, DNSTypeName(question->qtype));
- // If the result was zero, it meant that there are no search domains and we just retried the question
- // as a single label and we should not retry with search domains anymore.
- if (!result) question->SearchListIndex = -1;
- return mDNStrue;
- }
- else
- {
- LogMsg("%3d: ERROR: RetryQuestionWithSearchDomains %##s %s mDNS_StartQuery: %d, while retrying with search domains", req->sd, question->qname.c, DNSTypeName(question->qtype), (int)err);
- // We have already stopped the query and could not restart. Reset the appropriate pointers
- // so that we don't call stop again when the question terminates
- question->QuestionContext = mDNSNULL;
- }
- }
- }
- else
- {
- LogInfo("%3d: RetryQuestionWithSearchDomains: Not appending search domains - SuppressQuery %d, SearchListIndex %d, AppendSearchDomains %d", req->sd, question->SuppressQuery, question->SearchListIndex, question->AppendSearchDomains);
- }
- return mDNSfalse;
- }
-
-mDNSlocal void queryrecord_result_callback(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord)
- {
- char name[MAX_ESCAPED_DOMAIN_NAME];
- request_state *req = question->QuestionContext;
- reply_state *rep;
- char *data;
- size_t len;
- DNSServiceErrorType error = kDNSServiceErr_NoError;
- DNSQuestion *q = mDNSNULL;
-
-#if APPLE_OSX_mDNSResponder
- {
- // Sanity check: QuestionContext is set to NULL after we stop the question and hence we should not
- // get any callbacks from the core after this.
- if (!req)
- {
- LogMsg("queryrecord_result_callback: ERROR!! QuestionContext NULL for %##s (%s)", question->qname.c, DNSTypeName(question->qtype));
- return;
- }
- if (req->hdr.op == query_request && question == req->u.queryrecord.q2)
- q = &req->u.queryrecord.q;
- else if (req->hdr.op == addrinfo_request && question == req->u.addrinfo.q42)
- q = &req->u.addrinfo.q4;
- else if (req->hdr.op == addrinfo_request && question == req->u.addrinfo.q62)
- q = &req->u.addrinfo.q6;
-
- if (q && question->qtype != q->qtype && !SameDomainName(&question->qname, &q->qname))
- {
- mStatus err;
- domainname *orig = question->qnameOrig;
-
- LogInfo("queryrecord_result_callback: Stopping q2 local %##s", question->qname.c);
- mDNS_StopQuery(m, question);
- question->QuestionContext = mDNSNULL;
-
- // We got a negative response for the SOA record indicating that .local does not exist.
- // But we might have other search domains (that does not end in .local) that can be
- // appended to this question. In that case, we want to retry the question. Otherwise,
- // we don't want to try this question as unicast.
- if (answer->RecordType == kDNSRecordTypePacketNegative && !q->AppendSearchDomains)
- {
- LogInfo("queryrecord_result_callback: question %##s AppendSearchDomains zero", q->qname.c);
- return;
- }
-
- // If we got a non-negative answer for our "local SOA" test query, start an additional parallel unicast query
- //
- // Note: When we copy the original question, we copy everything including the AppendSearchDomains,
- // RetryWithSearchDomains except for qnameOrig which can be non-NULL if the original question is
- // e.g., somehost and then we appended e.g., ".local" and retried that question. See comment in
- // SendAdditionalQuery as to how qnameOrig gets initialized.
- *question = *q;
- question->InterfaceID = mDNSInterface_Unicast;
- question->ExpectUnique = mDNStrue;
- question->qnameOrig = orig;
-
- LogOperation("%3d: DNSServiceQueryRecord(%##s, %s) unicast, context %p", req->sd, question->qname.c, DNSTypeName(question->qtype), question->QuestionContext);
-
- // If the original question timed out, its QuestionContext would already be set to NULL and that's what we copied above.
- // Hence, we need to set it explicitly here.
- question->QuestionContext = req;
- err = mDNS_StartQuery(m, question);
- if (err) LogMsg("%3d: ERROR: queryrecord_result_callback %##s %s mDNS_StartQuery: %d", req->sd, question->qname.c, DNSTypeName(question->qtype), (int)err);
-
- // If we got a positive response to local SOA, then try the .local question as unicast
- if (answer->RecordType != kDNSRecordTypePacketNegative) return;
-
- // Fall through and get the next search domain. The question is pointing at .local
- // and we don't want to try that. Try the next search domain. Don't try with local
- // search domains for the unicast question anymore.
- //
- // Note: we started the question above which will be stopped immediately (never sent on the wire)
- // before we pick the next search domain below. RetryQuestionWithSearchDomains assumes that the
- // question has already started.
- question->AppendLocalSearchDomains = 0;
- }
-
- if (q && AddRecord && (question->InterfaceID == mDNSInterface_Unicast) && !answer->rdlength)
- {
- // If we get a negative response to the unicast query that we sent above, retry after appending search domains
- // Note: We could have appended search domains below (where do it for regular unicast questions) instead of doing it here.
- // As we ignore negative unicast answers below, we would never reach the code where the search domains are appended.
- // To keep things simple, we handle unicast ".local" separately here.
- LogInfo("queryrecord_result_callback: Retrying .local question %##s (%s) as unicast after appending search domains", question->qname.c, DNSTypeName(question->qtype));
- if (RetryQuestionWithSearchDomains(m, question, req))
- return;
- if (question->AppendSearchDomains && !question->AppendLocalSearchDomains && IsLocalDomain(&question->qname))
- {
- // If "local" is the last search domain, we need to stop the question so that we don't send the "local"
- // question on the wire as we got a negative response for the local SOA. But, we can't stop the question
- // yet as we may have to timeout the question (done by the "core") for which we need to leave the question
- // in the list. We leave it disabled so that it does not hit the wire.
- LogInfo("queryrecord_result_callback: Disabling .local question %##s (%s)", question->qname.c, DNSTypeName(question->qtype));
- question->ThisQInterval = 0;
- }
- }
- // If we are here it means that either "question" is not "q2" OR we got a positive response for "q2" OR we have no more search
- // domains to append for "q2". In all cases, fall through and deliver the response
- }
-#endif // APPLE_OSX_mDNSResponder
-
- if (answer->RecordType == kDNSRecordTypePacketNegative)
- {
- // If this question needs to be timed out and we have reached the stop time, mark
- // the error as timeout. It is possible that we might get a negative response from an
- // external DNS server at the same time when this question reaches its stop time. We
- // can't tell the difference as there is no indication in the callback. This should
- // be okay as we will be timing out this query anyway.
- mDNS_Lock(m);
- if (question->TimeoutQuestion)
- {
- if ((m->timenow - question->StopTime) >= 0)
- {
- LogInfo("queryrecord_result_callback:Question %##s (%s) timing out, InterfaceID %p", question->qname.c, DNSTypeName(question->qtype), question->InterfaceID);
- error = kDNSServiceErr_Timeout;
- }
- }
- mDNS_Unlock(m);
- // When we're doing parallel unicast and multicast queries for dot-local names (for supporting Microsoft
- // Active Directory sites) we need to ignore negative unicast answers. Otherwise we'll generate negative
- // answers for just about every single multicast name we ever look up, since the Microsoft Active Directory
- // server is going to assert that pretty much every single multicast name doesn't exist.
- //
- // If we are timing out this query, we need to deliver the negative answer to the application
- if (error != kDNSServiceErr_Timeout)
- {
- if (!answer->InterfaceID && IsLocalDomain(answer->name))
- {
- LogInfo("queryrecord_result_callback:Question %##s (%s) answering local with unicast", question->qname.c, DNSTypeName(question->qtype));
- return;
- }
- error = kDNSServiceErr_NoSuchRecord;
- }
- AddRecord = mDNStrue;
- }
- // If we get a negative answer, try appending search domains. Don't append search domains
- // - if we are timing out this question
- // - if the negative response was received as a result of a multicast query
- // - if this is an additional query (q2), we already appended search domains above (indicated by "!q" below)
- if (error != kDNSServiceErr_Timeout)
- {
- if (!q && !answer->InterfaceID && !answer->rdlength && AddRecord)
- {
- // If the original question did not end in .local, we did not send an SOA query
- // to figure out whether we should send an additional unicast query or not. If we just
- // appended .local, we need to see if we need to send an additional query. This should
- // normally happen just once because after we append .local, we ignore all negative
- // responses for .local above.
- LogInfo("queryrecord_result_callback: Retrying question %##s (%s) after appending search domains", question->qname.c, DNSTypeName(question->qtype));
- if (RetryQuestionWithSearchDomains(m, question, req))
- {
- // Note: We need to call SendAdditionalQuery every time after appending a search domain as .local could
- // be anywhere in the search domain list.
-#if APPLE_OSX_mDNSResponder
- mStatus err = mStatus_NoError;
- err = SendAdditionalQuery(question, req, err);
- if (err) LogMsg("queryrecord_result_callback: Sending .local SOA query failed, after appending domains");
-#endif // APPLE_OSX_mDNSResponder
- return;
- }
- }
- }
-
- ConvertDomainNameToCString(answer->name, name);
-
- LogOperation("%3d: %s(%##s, %s) %s %s", req->sd,
- req->hdr.op == query_request ? "DNSServiceQueryRecord" : "DNSServiceGetAddrInfo",
- question->qname.c, DNSTypeName(question->qtype), AddRecord ? "ADD" : "RMV", RRDisplayString(m, answer));
-
- len = sizeof(DNSServiceFlags); // calculate reply data length
- len += sizeof(mDNSu32); // interface index
- len += sizeof(DNSServiceErrorType);
- len += strlen(name) + 1;
- len += 3 * sizeof(mDNSu16); // type, class, rdlen
- len += answer->rdlength;
- len += sizeof(mDNSu32); // TTL
-
- rep = create_reply(req->hdr.op == query_request ? query_reply_op : addrinfo_reply_op, len, req);
-
- rep->rhdr->flags = dnssd_htonl(AddRecord ? kDNSServiceFlagsAdd : 0);
- // Call mDNSPlatformInterfaceIndexfromInterfaceID, but suppressNetworkChange (last argument). Otherwise, if the
- // InterfaceID is not valid, then it simulates a "NetworkChanged" which in turn makes questions
- // to be stopped and started including *this* one. Normally the InterfaceID is valid. But when we
- // are using the /etc/hosts entries to answer a question, the InterfaceID may not be known to the
- // mDNS core . Eventually, we should remove the calls to "NetworkChanged" in
- // mDNSPlatformInterfaceIndexfromInterfaceID when it can't find InterfaceID as ResourceRecords
- // should not have existed to answer this question if the corresponding interface is not valid.
- rep->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(m, answer->InterfaceID, mDNStrue));
- rep->rhdr->error = dnssd_htonl(error);
-
- data = (char *)&rep->rhdr[1];
-
- put_string(name, &data);
- put_uint16(answer->rrtype, &data);
- put_uint16(answer->rrclass, &data);
- put_uint16(answer->rdlength, &data);
- // We need to use putRData here instead of the crude put_rdata function, because the crude put_rdata
- // function just does a blind memory copy without regard to structures that may have holes in them.
- if (answer->rdlength)
- if (!putRData(mDNSNULL, (mDNSu8 *)data, (mDNSu8 *)rep->rhdr + len, answer))
- LogMsg("queryrecord_result_callback putRData failed %d", (mDNSu8 *)rep->rhdr + len - (mDNSu8 *)data);
- data += answer->rdlength;
- put_uint32(AddRecord ? answer->rroriginalttl : 0, &data);
-
- append_reply(req, rep);
- // Stop the question, if we just timed out
- if (error == kDNSServiceErr_Timeout)
- {
- mDNS_StopQuery(m, question);
- // Reset the pointers so that we don't call stop on termination
- question->QuestionContext = mDNSNULL;
- }
-#if APPLE_OSX_mDNSResponder
-#if ! NO_WCF
- CHECK_WCF_FUNCTION(WCFIsServerRunning)
- {
- struct xucred x;
- socklen_t xucredlen = sizeof(x);
-
- if (WCFIsServerRunning((WCFConnection *)m->WCF) && answer->rdlength != 0)
- {
- if (getsockopt(req->sd, 0, LOCAL_PEERCRED, &x, &xucredlen) >= 0 &&
- (x.cr_version == XUCRED_VERSION))
- {
- struct sockaddr_storage addr;
- const RDataBody2 *const rdb = (RDataBody2 *)answer->rdata->u.data;
- addr.ss_len = 0;
- if (answer->rrtype == kDNSType_A || answer->rrtype == kDNSType_AAAA)
- {
- if (answer->rrtype == kDNSType_A)
- {
- struct sockaddr_in *sin = (struct sockaddr_in *)&addr;
- sin->sin_port = 0;
- if (!putRData(mDNSNULL, (mDNSu8 *)&sin->sin_addr, (mDNSu8 *)(&sin->sin_addr + sizeof(rdb->ipv4)), answer))
- LogMsg("queryrecord_result_callback: WCF AF_INET putRData failed");
- else
- {
- addr.ss_len = sizeof (struct sockaddr_in);
- addr.ss_family = AF_INET;
- }
- }
- else if (answer->rrtype == kDNSType_AAAA)
- {
- struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&addr;
- sin6->sin6_port = 0;
- if (!putRData(mDNSNULL, (mDNSu8 *)&sin6->sin6_addr, (mDNSu8 *)(&sin6->sin6_addr + sizeof(rdb->ipv6)), answer))
- LogMsg("queryrecord_result_callback: WCF AF_INET6 putRData failed");
- else
- {
- addr.ss_len = sizeof (struct sockaddr_in6);
- addr.ss_family = AF_INET6;
- }
- }
- if (addr.ss_len)
- {
- debugf("queryrecord_result_callback: Name %s, uid %u, addr length %d", name, x.cr_uid, addr.ss_len);
- CHECK_WCF_FUNCTION((WCFConnection *)WCFNameResolvesToAddr)
- {
- WCFNameResolvesToAddr(m->WCF, name, (struct sockaddr *)&addr, x.cr_uid);
- }
- }
- }
- else if (answer->rrtype == kDNSType_CNAME)
- {
- domainname cname;
- char cname_cstr[MAX_ESCAPED_DOMAIN_NAME];
- if (!putRData(mDNSNULL, cname.c, (mDNSu8 *)(cname.c + MAX_DOMAIN_NAME), answer))
- LogMsg("queryrecord_result_callback: WCF CNAME putRData failed");
- else
- {
- ConvertDomainNameToCString(&cname, cname_cstr);
- CHECK_WCF_FUNCTION((WCFConnection *)WCFNameResolvesToAddr)
- {
- WCFNameResolvesToName(m->WCF, name, cname_cstr, x.cr_uid);
- }
- }
- }
- }
- else my_perror("queryrecord_result_callback: ERROR: getsockopt LOCAL_PEERCRED");
- }
- }
-#endif
-#endif
- }
-
-mDNSlocal void queryrecord_termination_callback(request_state *request)
- {
- LogOperation("%3d: DNSServiceQueryRecord(%##s, %s) STOP",
- request->sd, request->u.queryrecord.q.qname.c, DNSTypeName(request->u.queryrecord.q.qtype));
- if (request->u.queryrecord.q.QuestionContext)
- {
- mDNS_StopQuery(&mDNSStorage, &request->u.queryrecord.q); // no need to error check
- request->u.queryrecord.q.QuestionContext = mDNSNULL;
- }
- else
- {
- DNSQuestion *question = &request->u.queryrecord.q;
- LogInfo("queryrecord_termination_callback: question %##s (%s) already stopped, InterfaceID %p", question->qname.c, DNSTypeName(question->qtype), question->InterfaceID);
- }
-
- if (request->u.queryrecord.q.qnameOrig)
- {
- freeL("QueryTermination", request->u.queryrecord.q.qnameOrig);
- request->u.queryrecord.q.qnameOrig = mDNSNULL;
- }
- if (request->u.queryrecord.q.InterfaceID == mDNSInterface_P2P || (!request->u.queryrecord.q.InterfaceID && SameDomainName((const domainname *)LastLabel(&request->u.queryrecord.q.qname), &localdomain) && (request->flags & kDNSServiceFlagsIncludeP2P)))
- {
- LogInfo("queryrecord_termination_callback: calling external_stop_browsing_for_service()");
- external_stop_browsing_for_service(&mDNSStorage, &request->u.queryrecord.q.qname, request->u.queryrecord.q.qtype);
- }
- if (request->u.queryrecord.q2)
- {
- if (request->u.queryrecord.q2->QuestionContext)
- {
- LogInfo("queryrecord_termination_callback: Stopping q2 %##s", request->u.queryrecord.q2->qname.c);
- mDNS_StopQuery(&mDNSStorage, request->u.queryrecord.q2);
- }
- else
- {
- DNSQuestion *question = request->u.queryrecord.q2;
- LogInfo("queryrecord_termination_callback: q2 %##s (%s) already stopped, InterfaceID %p", question->qname.c, DNSTypeName(question->qtype), question->InterfaceID);
- }
- if (request->u.queryrecord.q2->qnameOrig)
- {
- LogInfo("queryrecord_termination_callback: freeing q2 qnameOrig %##s", request->u.queryrecord.q2->qnameOrig->c);
- freeL("QueryTermination q2", request->u.queryrecord.q2->qnameOrig);
- request->u.queryrecord.q2->qnameOrig = mDNSNULL;
- }
- freeL("queryrecord Q2", request->u.queryrecord.q2);
- request->u.queryrecord.q2 = mDNSNULL;
- }
- }
-
-mDNSlocal mStatus handle_queryrecord_request(request_state *request)
- {
- DNSQuestion *const q = &request->u.queryrecord.q;
- char name[256];
- mDNSu16 rrtype, rrclass;
- mStatus err;
-
- DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend);
- mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend);
- mDNSInterfaceID InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex);
- if (interfaceIndex && !InterfaceID) return(mStatus_BadParamErr);
-
- if (get_string(&request->msgptr, request->msgend, name, 256) < 0) return(mStatus_BadParamErr);
- rrtype = get_uint16(&request->msgptr, request->msgend);
- rrclass = get_uint16(&request->msgptr, request->msgend);
-
- if (!request->msgptr)
- { LogMsg("%3d: DNSServiceQueryRecord(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
-
- request->flags = flags;
- mDNSPlatformMemZero(&request->u.queryrecord, sizeof(request->u.queryrecord));
-
- q->InterfaceID = InterfaceID;
- q->Target = zeroAddr;
- if (!MakeDomainNameFromDNSNameString(&q->qname, name)) return(mStatus_BadParamErr);
-#if 0
- if (!AuthorizedDomain(request, &q->qname, AutoBrowseDomains)) return (mStatus_NoError);
-#endif
- q->qtype = rrtype;
- q->qclass = rrclass;
- q->LongLived = (flags & kDNSServiceFlagsLongLivedQuery ) != 0;
- q->ExpectUnique = mDNSfalse;
- q->ForceMCast = (flags & kDNSServiceFlagsForceMulticast ) != 0;
- q->ReturnIntermed = (flags & kDNSServiceFlagsReturnIntermediates) != 0;
- q->SuppressUnusable = (flags & kDNSServiceFlagsSuppressUnusable ) != 0;
- q->TimeoutQuestion = (flags & kDNSServiceFlagsTimeout ) != 0;
- q->WakeOnResolve = 0;
- q->QuestionCallback = queryrecord_result_callback;
- q->QuestionContext = request;
- q->SearchListIndex = 0;
-
- // Don't append search domains for fully qualified domain names including queries
- // such as e.g., "abc." that has only one label. We convert all names to FQDNs as internally
- // we only deal with FQDNs. Hence, we cannot look at qname to figure out whether we should
- // append search domains or not. So, we record that information in AppendSearchDomains.
- //
- // We append search domains only for queries that are a single label. If overriden using
- // command line argument "AlwaysAppendSearchDomains", then we do it for any query which
- // is not fully qualified.
-
- if ((rrtype == kDNSType_A || rrtype == kDNSType_AAAA) && name[strlen(name) - 1] != '.' &&
- (AlwaysAppendSearchDomains || CountLabels(&q->qname) == 1))
- {
- q->AppendSearchDomains = 1;
- q->AppendLocalSearchDomains = 1;
- }
- else
- {
- q->AppendSearchDomains = 0;
- q->AppendLocalSearchDomains = 0;
- }
-
- // For single label queries that are not fully qualified, look at /etc/hosts, cache and try
- // search domains before trying them on the wire as a single label query. RetryWithSearchDomains
- // tell the core to call back into the UDS layer if there is no valid response in /etc/hosts or
- // the cache
- q->RetryWithSearchDomains = ApplySearchDomainsFirst(q) ? 1 : 0;
- q->qnameOrig = mDNSNULL;
-
- LogOperation("%3d: DNSServiceQueryRecord(%X, %d, %##s, %s) START", request->sd, flags, interfaceIndex, q->qname.c, DNSTypeName(q->qtype));
- err = mDNS_StartQuery(&mDNSStorage, q);
- if (err) LogMsg("%3d: ERROR: DNSServiceQueryRecord %##s %s mDNS_StartQuery: %d", request->sd, q->qname.c, DNSTypeName(q->qtype), (int)err);
- else
- {
- request->terminate = queryrecord_termination_callback;
- if (q->InterfaceID == mDNSInterface_P2P || (!q->InterfaceID && SameDomainName((const domainname *)LastLabel(&q->qname), &localdomain) && (flags & kDNSServiceFlagsIncludeP2P)))
- {
- LogInfo("handle_queryrecord_request: calling external_start_browsing_for_service()");
- external_start_browsing_for_service(&mDNSStorage, &q->qname, q->qtype);
- }
- }
-
-#if APPLE_OSX_mDNSResponder
- err = SendAdditionalQuery(q, request, err);
-#endif // APPLE_OSX_mDNSResponder
-
- return(err);
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - DNSServiceEnumerateDomains
-#endif
-
-mDNSlocal reply_state *format_enumeration_reply(request_state *request,
- const char *domain, DNSServiceFlags flags, mDNSu32 ifi, DNSServiceErrorType err)
- {
- size_t len;
- reply_state *reply;
- char *data;
-
- len = sizeof(DNSServiceFlags);
- len += sizeof(mDNSu32);
- len += sizeof(DNSServiceErrorType);
- len += strlen(domain) + 1;
-
- reply = create_reply(enumeration_reply_op, len, request);
- reply->rhdr->flags = dnssd_htonl(flags);
- reply->rhdr->ifi = dnssd_htonl(ifi);
- reply->rhdr->error = dnssd_htonl(err);
- data = (char *)&reply->rhdr[1];
- put_string(domain, &data);
- return reply;
- }
-
-mDNSlocal void enum_termination_callback(request_state *request)
- {
- mDNS_StopGetDomains(&mDNSStorage, &request->u.enumeration.q_all);
- mDNS_StopGetDomains(&mDNSStorage, &request->u.enumeration.q_default);
- }
-
-mDNSlocal void enum_result_callback(mDNS *const m,
- DNSQuestion *const question, const ResourceRecord *const answer, QC_result AddRecord)
- {
- char domain[MAX_ESCAPED_DOMAIN_NAME];
- request_state *request = question->QuestionContext;
- DNSServiceFlags flags = 0;
- reply_state *reply;
- (void)m; // Unused
-
- if (answer->rrtype != kDNSType_PTR) return;
-
-#if 0
- if (!AuthorizedDomain(request, &answer->rdata->u.name, request->u.enumeration.flags ? AutoRegistrationDomains : AutoBrowseDomains)) return;
-#endif
-
- // We only return add/remove events for the browse and registration lists
- // For the default browse and registration answers, we only give an "ADD" event
- if (question == &request->u.enumeration.q_default && !AddRecord) return;
-
- if (AddRecord)
- {
- flags |= kDNSServiceFlagsAdd;
- if (question == &request->u.enumeration.q_default) flags |= kDNSServiceFlagsDefault;
- }
-
- ConvertDomainNameToCString(&answer->rdata->u.name, domain);
- // Note that we do NOT propagate specific interface indexes to the client - for example, a domain we learn from
- // a machine's system preferences may be discovered on the LocalOnly interface, but should be browsed on the
- // network, so we just pass kDNSServiceInterfaceIndexAny
- reply = format_enumeration_reply(request, domain, flags, kDNSServiceInterfaceIndexAny, kDNSServiceErr_NoError);
- if (!reply) { LogMsg("ERROR: enum_result_callback, format_enumeration_reply"); return; }
-
- LogOperation("%3d: DNSServiceEnumerateDomains(%#2s) RESULT %s: %s", request->sd, question->qname.c, AddRecord ? "Add" : "Rmv", domain);
-
- append_reply(request, reply);
- }
-
-mDNSlocal mStatus handle_enum_request(request_state *request)
- {
- mStatus err;
- DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend);
- DNSServiceFlags reg = flags & kDNSServiceFlagsRegistrationDomains;
- mDNS_DomainType t_all = reg ? mDNS_DomainTypeRegistration : mDNS_DomainTypeBrowse;
- mDNS_DomainType t_default = reg ? mDNS_DomainTypeRegistrationDefault : mDNS_DomainTypeBrowseDefault;
- mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend);
- mDNSInterfaceID InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex);
- if (interfaceIndex && !InterfaceID) return(mStatus_BadParamErr);
-
- if (!request->msgptr)
- { LogMsg("%3d: DNSServiceEnumerateDomains(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
-
- // allocate context structures
- uDNS_SetupSearchDomains(&mDNSStorage, UDNS_START_WAB_QUERY);
-
-#if 0
- // mark which kind of enumeration we're doing so we can (de)authorize certain domains
- request->u.enumeration.flags = reg;
-#endif
-
- // enumeration requires multiple questions, so we must link all the context pointers so that
- // necessary context can be reached from the callbacks
- request->u.enumeration.q_all .QuestionContext = request;
- request->u.enumeration.q_default.QuestionContext = request;
-
- // if the caller hasn't specified an explicit interface, we use local-only to get the system-wide list.
- if (!InterfaceID) InterfaceID = mDNSInterface_LocalOnly;
-
- // make the calls
- LogOperation("%3d: DNSServiceEnumerateDomains(%X=%s)", request->sd, flags,
- (flags & kDNSServiceFlagsBrowseDomains ) ? "kDNSServiceFlagsBrowseDomains" :
- (flags & kDNSServiceFlagsRegistrationDomains) ? "kDNSServiceFlagsRegistrationDomains" : "<<Unknown>>");
- err = mDNS_GetDomains(&mDNSStorage, &request->u.enumeration.q_all, t_all, NULL, InterfaceID, enum_result_callback, request);
- if (!err)
- {
- err = mDNS_GetDomains(&mDNSStorage, &request->u.enumeration.q_default, t_default, NULL, InterfaceID, enum_result_callback, request);
- if (err) mDNS_StopGetDomains(&mDNSStorage, &request->u.enumeration.q_all);
- else request->terminate = enum_termination_callback;
- }
-
- return(err);
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - DNSServiceReconfirmRecord & Misc
-#endif
-
-mDNSlocal mStatus handle_reconfirm_request(request_state *request)
- {
- mStatus status = mStatus_BadParamErr;
- AuthRecord *rr = read_rr_from_ipc_msg(request, 0, 0);
- if (rr)
- {
- status = mDNS_ReconfirmByValue(&mDNSStorage, &rr->resrec);
- LogOperation(
- (status == mStatus_NoError) ?
- "%3d: DNSServiceReconfirmRecord(%s) interface %d initiated" :
- "%3d: DNSServiceReconfirmRecord(%s) interface %d failed: %d",
- request->sd, RRDisplayString(&mDNSStorage, &rr->resrec),
- mDNSPlatformInterfaceIndexfromInterfaceID(&mDNSStorage, rr->resrec.InterfaceID, mDNSfalse), status);
- freeL("AuthRecord/handle_reconfirm_request", rr);
- }
- return(status);
- }
-
-mDNSlocal mStatus handle_setdomain_request(request_state *request)
- {
- char domainstr[MAX_ESCAPED_DOMAIN_NAME];
- domainname domain;
- DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend);
- (void)flags; // Unused
- if (get_string(&request->msgptr, request->msgend, domainstr, MAX_ESCAPED_DOMAIN_NAME) < 0 ||
- !MakeDomainNameFromDNSNameString(&domain, domainstr))
- { LogMsg("%3d: DNSServiceSetDefaultDomainForUser(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
-
- LogOperation("%3d: DNSServiceSetDefaultDomainForUser(%##s)", request->sd, domain.c);
- return(mStatus_NoError);
- }
-
-typedef packedstruct
- {
- mStatus err;
- mDNSu32 len;
- mDNSu32 vers;
- } DaemonVersionReply;
-
-mDNSlocal void handle_getproperty_request(request_state *request)
- {
- const mStatus BadParamErr = dnssd_htonl((mDNSu32)mStatus_BadParamErr);
- char prop[256];
- if (get_string(&request->msgptr, request->msgend, prop, sizeof(prop)) >= 0)
- {
- LogOperation("%3d: DNSServiceGetProperty(%s)", request->sd, prop);
- if (!strcmp(prop, kDNSServiceProperty_DaemonVersion))
- {
- DaemonVersionReply x = { 0, dnssd_htonl(4), dnssd_htonl(_DNS_SD_H) };
- send_all(request->sd, (const char *)&x, sizeof(x));
- return;
- }
- }
-
- // If we didn't recogize the requested property name, return BadParamErr
- send_all(request->sd, (const char *)&BadParamErr, sizeof(BadParamErr));
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - DNSServiceNATPortMappingCreate
-#endif
-
-#define DNSServiceProtocol(X) ((X) == NATOp_AddrRequest ? 0 : (X) == NATOp_MapUDP ? kDNSServiceProtocol_UDP : kDNSServiceProtocol_TCP)
-
-mDNSlocal void port_mapping_termination_callback(request_state *request)
- {
- LogOperation("%3d: DNSServiceNATPortMappingCreate(%X, %u, %u, %d) STOP", request->sd,
- DNSServiceProtocol(request->u.pm.NATinfo.Protocol),
- mDNSVal16(request->u.pm.NATinfo.IntPort), mDNSVal16(request->u.pm.ReqExt), request->u.pm.NATinfo.NATLease);
- mDNS_StopNATOperation(&mDNSStorage, &request->u.pm.NATinfo);
- }
-
-// Called via function pointer when we get a NAT-PMP address request or port mapping response
-mDNSlocal void port_mapping_create_request_callback(mDNS *m, NATTraversalInfo *n)
- {
- request_state *request = (request_state *)n->clientContext;
- reply_state *rep;
- int replyLen;
- char *data;
-
- if (!request) { LogMsg("port_mapping_create_request_callback called with unknown request_state object"); return; }
-
- // calculate reply data length
- replyLen = sizeof(DNSServiceFlags);
- replyLen += 3 * sizeof(mDNSu32); // if index + addr + ttl
- replyLen += sizeof(DNSServiceErrorType);
- replyLen += 2 * sizeof(mDNSu16); // Internal Port + External Port
- replyLen += sizeof(mDNSu8); // protocol
-
- rep = create_reply(port_mapping_reply_op, replyLen, request);
-
- rep->rhdr->flags = dnssd_htonl(0);
- rep->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(m, n->InterfaceID, mDNSfalse));
- rep->rhdr->error = dnssd_htonl(n->Result);
-
- data = (char *)&rep->rhdr[1];
-
- *data++ = request->u.pm.NATinfo.ExternalAddress.b[0];
- *data++ = request->u.pm.NATinfo.ExternalAddress.b[1];
- *data++ = request->u.pm.NATinfo.ExternalAddress.b[2];
- *data++ = request->u.pm.NATinfo.ExternalAddress.b[3];
- *data++ = DNSServiceProtocol(request->u.pm.NATinfo.Protocol);
- *data++ = request->u.pm.NATinfo.IntPort.b[0];
- *data++ = request->u.pm.NATinfo.IntPort.b[1];
- *data++ = request->u.pm.NATinfo.ExternalPort.b[0];
- *data++ = request->u.pm.NATinfo.ExternalPort.b[1];
- put_uint32(request->u.pm.NATinfo.Lifetime, &data);
-
- LogOperation("%3d: DNSServiceNATPortMappingCreate(%X, %u, %u, %d) RESULT %.4a:%u TTL %u", request->sd,
- DNSServiceProtocol(request->u.pm.NATinfo.Protocol),
- mDNSVal16(request->u.pm.NATinfo.IntPort), mDNSVal16(request->u.pm.ReqExt), request->u.pm.NATinfo.NATLease,
- &request->u.pm.NATinfo.ExternalAddress, mDNSVal16(request->u.pm.NATinfo.ExternalPort), request->u.pm.NATinfo.Lifetime);
-
- append_reply(request, rep);
- }
-
-mDNSlocal mStatus handle_port_mapping_request(request_state *request)
- {
- mDNSu32 ttl = 0;
- mStatus err = mStatus_NoError;
-
- DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend);
- mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend);
- mDNSInterfaceID InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex);
- mDNSu8 protocol = (mDNSu8)get_uint32(&request->msgptr, request->msgend);
- (void)flags; // Unused
- if (interfaceIndex && !InterfaceID) return(mStatus_BadParamErr);
- if (request->msgptr + 8 > request->msgend) request->msgptr = NULL;
- else
- {
- request->u.pm.NATinfo.IntPort.b[0] = *request->msgptr++;
- request->u.pm.NATinfo.IntPort.b[1] = *request->msgptr++;
- request->u.pm.ReqExt.b[0] = *request->msgptr++;
- request->u.pm.ReqExt.b[1] = *request->msgptr++;
- ttl = get_uint32(&request->msgptr, request->msgend);
- }
-
- if (!request->msgptr)
- { LogMsg("%3d: DNSServiceNATPortMappingCreate(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
-
- if (protocol == 0) // If protocol == 0 (i.e. just request public address) then IntPort, ExtPort, ttl must be zero too
- {
- if (!mDNSIPPortIsZero(request->u.pm.NATinfo.IntPort) || !mDNSIPPortIsZero(request->u.pm.ReqExt) || ttl) return(mStatus_BadParamErr);
- }
- else
- {
- if (mDNSIPPortIsZero(request->u.pm.NATinfo.IntPort)) return(mStatus_BadParamErr);
- if (!(protocol & (kDNSServiceProtocol_UDP | kDNSServiceProtocol_TCP))) return(mStatus_BadParamErr);
- }
-
- request->u.pm.NATinfo.Protocol = !protocol ? NATOp_AddrRequest : (protocol == kDNSServiceProtocol_UDP) ? NATOp_MapUDP : NATOp_MapTCP;
- // u.pm.NATinfo.IntPort = already set above
- request->u.pm.NATinfo.RequestedPort = request->u.pm.ReqExt;
- request->u.pm.NATinfo.NATLease = ttl;
- request->u.pm.NATinfo.clientCallback = port_mapping_create_request_callback;
- request->u.pm.NATinfo.clientContext = request;
-
- LogOperation("%3d: DNSServiceNATPortMappingCreate(%X, %u, %u, %d) START", request->sd,
- protocol, mDNSVal16(request->u.pm.NATinfo.IntPort), mDNSVal16(request->u.pm.ReqExt), request->u.pm.NATinfo.NATLease);
- err = mDNS_StartNATOperation(&mDNSStorage, &request->u.pm.NATinfo);
- if (err) LogMsg("ERROR: mDNS_StartNATOperation: %d", (int)err);
- else request->terminate = port_mapping_termination_callback;
-
- return(err);
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - DNSServiceGetAddrInfo
-#endif
-
-mDNSlocal void addrinfo_termination_callback(request_state *request)
- {
- LogOperation("%3d: DNSServiceGetAddrInfo(%##s) STOP", request->sd, request->u.addrinfo.q4.qname.c);
-
- if (request->u.addrinfo.q4.QuestionContext)
- {
- mDNS_StopQuery(&mDNSStorage, &request->u.addrinfo.q4);
- request->u.addrinfo.q4.QuestionContext = mDNSNULL;
- }
- if (request->u.addrinfo.q4.qnameOrig)
- {
- freeL("QueryTermination", request->u.addrinfo.q4.qnameOrig);
- request->u.addrinfo.q4.qnameOrig = mDNSNULL;
- }
- if (request->u.addrinfo.q42)
- {
- if (request->u.addrinfo.q42->QuestionContext)
- {
- LogInfo("addrinfo_termination_callback: Stopping q42 %##s", request->u.addrinfo.q42->qname.c);
- mDNS_StopQuery(&mDNSStorage, request->u.addrinfo.q42);
- }
- if (request->u.addrinfo.q42->qnameOrig)
- {
- LogInfo("addrinfo_termination_callback: freeing q42 qnameOrig %##s", request->u.addrinfo.q42->qnameOrig->c);
- freeL("QueryTermination q42", request->u.addrinfo.q42->qnameOrig);
- request->u.addrinfo.q42->qnameOrig = mDNSNULL;
- }
- freeL("addrinfo Q42", request->u.addrinfo.q42);
- request->u.addrinfo.q42 = mDNSNULL;
- }
-
- if (request->u.addrinfo.q6.QuestionContext)
- {
- mDNS_StopQuery(&mDNSStorage, &request->u.addrinfo.q6);
- request->u.addrinfo.q6.QuestionContext = mDNSNULL;
- }
- if (request->u.addrinfo.q6.qnameOrig)
- {
- freeL("QueryTermination", request->u.addrinfo.q6.qnameOrig);
- request->u.addrinfo.q6.qnameOrig = mDNSNULL;
- }
- if (request->u.addrinfo.q62)
- {
- if (request->u.addrinfo.q62->QuestionContext)
- {
- LogInfo("addrinfo_termination_callback: Stopping q62 %##s", request->u.addrinfo.q62->qname.c);
- mDNS_StopQuery(&mDNSStorage, request->u.addrinfo.q62);
- }
- if (request->u.addrinfo.q62->qnameOrig)
- {
- LogInfo("addrinfo_termination_callback: freeing q62 qnameOrig %##s", request->u.addrinfo.q62->qnameOrig->c);
- freeL("QueryTermination q62", request->u.addrinfo.q62->qnameOrig);
- request->u.addrinfo.q62->qnameOrig = mDNSNULL;
- }
- freeL("addrinfo Q62", request->u.addrinfo.q62);
- request->u.addrinfo.q62 = mDNSNULL;
- }
- }
-
-mDNSlocal mStatus handle_addrinfo_request(request_state *request)
- {
- char hostname[256];
- domainname d;
- mStatus err = 0;
-
- DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend);
- mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend);
-
- mDNSPlatformMemZero(&request->u.addrinfo, sizeof(request->u.addrinfo));
- request->u.addrinfo.interface_id = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex);
- request->u.addrinfo.flags = flags;
- request->u.addrinfo.protocol = get_uint32(&request->msgptr, request->msgend);
-
- if (interfaceIndex && !request->u.addrinfo.interface_id) return(mStatus_BadParamErr);
- if (request->u.addrinfo.protocol > (kDNSServiceProtocol_IPv4|kDNSServiceProtocol_IPv6)) return(mStatus_BadParamErr);
-
- if (get_string(&request->msgptr, request->msgend, hostname, 256) < 0) return(mStatus_BadParamErr);
-
- if (!request->msgptr) { LogMsg("%3d: DNSServiceGetAddrInfo(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
-
- if (!MakeDomainNameFromDNSNameString(&d, hostname))
- { LogMsg("ERROR: handle_addrinfo_request: bad hostname: %s", hostname); return(mStatus_BadParamErr); }
-
-#if 0
- if (!AuthorizedDomain(request, &d, AutoBrowseDomains)) return (mStatus_NoError);
-#endif
-
- if (!request->u.addrinfo.protocol)
- {
- flags |= kDNSServiceFlagsSuppressUnusable;
- request->u.addrinfo.protocol = (kDNSServiceProtocol_IPv4 | kDNSServiceProtocol_IPv6);
- }
-
- request->u.addrinfo.q4.InterfaceID = request->u.addrinfo.q6.InterfaceID = request->u.addrinfo.interface_id;
- request->u.addrinfo.q4.Target = request->u.addrinfo.q6.Target = zeroAddr;
- request->u.addrinfo.q4.qname = request->u.addrinfo.q6.qname = d;
- request->u.addrinfo.q4.qclass = request->u.addrinfo.q6.qclass = kDNSServiceClass_IN;
- request->u.addrinfo.q4.LongLived = request->u.addrinfo.q6.LongLived = (flags & kDNSServiceFlagsLongLivedQuery ) != 0;
- request->u.addrinfo.q4.ExpectUnique = request->u.addrinfo.q6.ExpectUnique = mDNSfalse;
- request->u.addrinfo.q4.ForceMCast = request->u.addrinfo.q6.ForceMCast = (flags & kDNSServiceFlagsForceMulticast ) != 0;
- request->u.addrinfo.q4.ReturnIntermed = request->u.addrinfo.q6.ReturnIntermed = (flags & kDNSServiceFlagsReturnIntermediates) != 0;
- request->u.addrinfo.q4.SuppressUnusable = request->u.addrinfo.q6.SuppressUnusable = (flags & kDNSServiceFlagsSuppressUnusable ) != 0;
- request->u.addrinfo.q4.TimeoutQuestion = request->u.addrinfo.q6.TimeoutQuestion = (flags & kDNSServiceFlagsTimeout ) != 0;
- request->u.addrinfo.q4.WakeOnResolve = request->u.addrinfo.q6.WakeOnResolve = 0;
- request->u.addrinfo.q4.qnameOrig = request->u.addrinfo.q6.qnameOrig = mDNSNULL;
-
- if (request->u.addrinfo.protocol & kDNSServiceProtocol_IPv4)
- {
- request->u.addrinfo.q4.qtype = kDNSServiceType_A;
- request->u.addrinfo.q4.SearchListIndex = 0;
-
- // We append search domains only for queries that are a single label. If overriden using
- // command line argument "AlwaysAppendSearchDomains", then we do it for any query which
- // is not fully qualified.
- if (hostname[strlen(hostname) - 1] != '.' && (AlwaysAppendSearchDomains || CountLabels(&d) == 1))
- {
- request->u.addrinfo.q4.AppendSearchDomains = 1;
- request->u.addrinfo.q4.AppendLocalSearchDomains = 1;
- }
- else
- {
- request->u.addrinfo.q4.AppendSearchDomains = 0;
- request->u.addrinfo.q4.AppendLocalSearchDomains = 0;
- }
- request->u.addrinfo.q4.RetryWithSearchDomains = (ApplySearchDomainsFirst(&request->u.addrinfo.q4) ? 1 : 0);
- request->u.addrinfo.q4.QuestionCallback = queryrecord_result_callback;
- request->u.addrinfo.q4.QuestionContext = request;
- err = mDNS_StartQuery(&mDNSStorage, &request->u.addrinfo.q4);
- if (err != mStatus_NoError)
- {
- LogMsg("ERROR: mDNS_StartQuery: %d", (int)err);
- request->u.addrinfo.q4.QuestionContext = mDNSNULL;
- }
- #if APPLE_OSX_mDNSResponder
- err = SendAdditionalQuery(&request->u.addrinfo.q4, request, err);
- #endif // APPLE_OSX_mDNSResponder
- }
-
- if (!err && (request->u.addrinfo.protocol & kDNSServiceProtocol_IPv6))
- {
- request->u.addrinfo.q6.qtype = kDNSServiceType_AAAA;
- request->u.addrinfo.q6.SearchListIndex = 0;
- if (hostname[strlen(hostname) - 1] != '.' && (AlwaysAppendSearchDomains || CountLabels(&d) == 1))
- {
- request->u.addrinfo.q6.AppendSearchDomains = 1;
- request->u.addrinfo.q6.AppendLocalSearchDomains = 1;
- }
- else
- {
- request->u.addrinfo.q6.AppendSearchDomains = 0;
- request->u.addrinfo.q6.AppendLocalSearchDomains = 0;
- }
- request->u.addrinfo.q6.RetryWithSearchDomains = (ApplySearchDomainsFirst(&request->u.addrinfo.q6) ? 1 : 0);
- request->u.addrinfo.q6.QuestionCallback = queryrecord_result_callback;
- request->u.addrinfo.q6.QuestionContext = request;
- err = mDNS_StartQuery(&mDNSStorage, &request->u.addrinfo.q6);
- if (err != mStatus_NoError)
- {
- LogMsg("ERROR: mDNS_StartQuery: %d", (int)err);
- request->u.addrinfo.q6.QuestionContext = mDNSNULL;
- if (request->u.addrinfo.protocol & kDNSServiceProtocol_IPv4)
- {
- // If we started a query for IPv4, we need to cancel it
- mDNS_StopQuery(&mDNSStorage, &request->u.addrinfo.q4);
- request->u.addrinfo.q4.QuestionContext = mDNSNULL;
- }
- }
- #if APPLE_OSX_mDNSResponder
- err = SendAdditionalQuery(&request->u.addrinfo.q6, request, err);
- #endif // APPLE_OSX_mDNSResponder
- }
-
- LogOperation("%3d: DNSServiceGetAddrInfo(%X, %d, %d, %##s) START",
- request->sd, flags, interfaceIndex, request->u.addrinfo.protocol, d.c);
-
- if (!err) request->terminate = addrinfo_termination_callback;
-
- return(err);
- }
-
-// ***************************************************************************
-#if COMPILER_LIKES_PRAGMA_MARK
-#pragma mark -
-#pragma mark - Main Request Handler etc.
-#endif
-
-mDNSlocal request_state *NewRequest(void)
- {
- request_state **p = &all_requests;
- while (*p) p=&(*p)->next;
- *p = mallocL("request_state", sizeof(request_state));
- if (!*p) FatalError("ERROR: malloc");
- mDNSPlatformMemZero(*p, sizeof(request_state));
- return(*p);
- }
-
-// read_msg may be called any time when the transfer state (req->ts) is t_morecoming.
-// if there is no data on the socket, the socket will be closed and t_terminated will be returned
-mDNSlocal void read_msg(request_state *req)
- {
- if (req->ts == t_terminated || req->ts == t_error)
- { LogMsg("%3d: ERROR: read_msg called with transfer state terminated or error", req->sd); req->ts = t_error; return; }
-
- if (req->ts == t_complete) // this must be death or something is wrong
- {
- char buf[4]; // dummy for death notification
- int nread = udsSupportReadFD(req->sd, buf, 4, 0, req->platform_data);
- if (!nread) { req->ts = t_terminated; return; }
- if (nread < 0) goto rerror;
- LogMsg("%3d: ERROR: read data from a completed request", req->sd);
- req->ts = t_error;
- return;
- }
-
- if (req->ts != t_morecoming)
- { LogMsg("%3d: ERROR: read_msg called with invalid transfer state (%d)", req->sd, req->ts); req->ts = t_error; return; }
-
- if (req->hdr_bytes < sizeof(ipc_msg_hdr))
- {
- mDNSu32 nleft = sizeof(ipc_msg_hdr) - req->hdr_bytes;
- int nread = udsSupportReadFD(req->sd, (char *)&req->hdr + req->hdr_bytes, nleft, 0, req->platform_data);
- if (nread == 0) { req->ts = t_terminated; return; }
- if (nread < 0) goto rerror;
- req->hdr_bytes += nread;
- if (req->hdr_bytes > sizeof(ipc_msg_hdr))
- { LogMsg("%3d: ERROR: read_msg - read too many header bytes", req->sd); req->ts = t_error; return; }
-
- // only read data if header is complete
- if (req->hdr_bytes == sizeof(ipc_msg_hdr))
- {
- ConvertHeaderBytes(&req->hdr);
- if (req->hdr.version != VERSION)
- { LogMsg("%3d: ERROR: client version 0x%08X daemon version 0x%08X", req->sd, req->hdr.version, VERSION); req->ts = t_error; return; }
-
- // Largest conceivable single request is a DNSServiceRegisterRecord() or DNSServiceAddRecord()
- // with 64kB of rdata. Adding 1009 byte for a maximal domain name, plus a safety margin
- // for other overhead, this means any message above 70kB is definitely bogus.
- if (req->hdr.datalen > 70000)
- { LogMsg("%3d: ERROR: read_msg: hdr.datalen %u (0x%X) > 70000", req->sd, req->hdr.datalen, req->hdr.datalen); req->ts = t_error; return; }
- req->msgbuf = mallocL("request_state msgbuf", req->hdr.datalen + MSG_PAD_BYTES);
- if (!req->msgbuf) { my_perror("ERROR: malloc"); req->ts = t_error; return; }
- req->msgptr = req->msgbuf;
- req->msgend = req->msgbuf + req->hdr.datalen;
- mDNSPlatformMemZero(req->msgbuf, req->hdr.datalen + MSG_PAD_BYTES);
- }
- }
-
- // If our header is complete, but we're still needing more body data, then try to read it now
- // Note: For cancel_request req->hdr.datalen == 0, but there's no error return socket for cancel_request
- // Any time we need to get the error return socket we know we'll have at least one data byte
- // (even if only the one-byte empty C string placeholder for the old ctrl_path parameter)
- if (req->hdr_bytes == sizeof(ipc_msg_hdr) && req->data_bytes < req->hdr.datalen)
- {
- mDNSu32 nleft = req->hdr.datalen - req->data_bytes;
- int nread;
-#if !defined(_WIN32)
- struct iovec vec = { req->msgbuf + req->data_bytes, nleft }; // Tell recvmsg where we want the bytes put
- struct msghdr msg;
- struct cmsghdr *cmsg;
- char cbuf[CMSG_SPACE(sizeof(dnssd_sock_t))];
- msg.msg_name = 0;
- msg.msg_namelen = 0;
- msg.msg_iov = &vec;
- msg.msg_iovlen = 1;
- msg.msg_control = cbuf;
- msg.msg_controllen = sizeof(cbuf);
- msg.msg_flags = 0;
- nread = recvmsg(req->sd, &msg, 0);
-#else
- nread = udsSupportReadFD(req->sd, (char *)req->msgbuf + req->data_bytes, nleft, 0, req->platform_data);
-#endif
- if (nread == 0) { req->ts = t_terminated; return; }
- if (nread < 0) goto rerror;
- req->data_bytes += nread;
- if (req->data_bytes > req->hdr.datalen)
- { LogMsg("%3d: ERROR: read_msg - read too many data bytes", req->sd); req->ts = t_error; return; }
-#if !defined(_WIN32)
- cmsg = CMSG_FIRSTHDR(&msg);
-#if DEBUG_64BIT_SCM_RIGHTS
- LogMsg("%3d: Expecting %d %d %d %d", req->sd, sizeof(cbuf), sizeof(cbuf), SOL_SOCKET, SCM_RIGHTS);
- LogMsg("%3d: Got %d %d %d %d", req->sd, msg.msg_controllen, cmsg->cmsg_len, cmsg->cmsg_level, cmsg->cmsg_type);
-#endif // DEBUG_64BIT_SCM_RIGHTS
- if (msg.msg_controllen == sizeof(cbuf) &&
- cmsg->cmsg_len == CMSG_LEN(sizeof(dnssd_sock_t)) &&
- cmsg->cmsg_level == SOL_SOCKET &&
- cmsg->cmsg_type == SCM_RIGHTS)
- {
-#if APPLE_OSX_mDNSResponder
- // Strictly speaking BPF_fd belongs solely in the platform support layer, but because
- // of privilege separation on Mac OS X we need to get BPF_fd from mDNSResponderHelper,
- // and it's convenient to repurpose the existing fd-passing code here for that task
- if (req->hdr.op == send_bpf)
- {
- dnssd_sock_t x = *(dnssd_sock_t *)CMSG_DATA(cmsg);
- LogOperation("%3d: Got BPF %d", req->sd, x);
- mDNSPlatformReceiveBPF_fd(&mDNSStorage, x);
- }
- else
-#endif // APPLE_OSX_mDNSResponder
- req->errsd = *(dnssd_sock_t *)CMSG_DATA(cmsg);
-#if DEBUG_64BIT_SCM_RIGHTS
- LogMsg("%3d: read req->errsd %d", req->sd, req->errsd);
-#endif // DEBUG_64BIT_SCM_RIGHTS
- if (req->data_bytes < req->hdr.datalen)
- {
- LogMsg("%3d: Client sent error socket %d via SCM_RIGHTS with req->data_bytes %d < req->hdr.datalen %d",
- req->sd, req->errsd, req->data_bytes, req->hdr.datalen);
- req->ts = t_error;
- return;
- }
- }
-#endif
- }
-
- // If our header and data are both complete, see if we need to make our separate error return socket
- if (req->hdr_bytes == sizeof(ipc_msg_hdr) && req->data_bytes == req->hdr.datalen)
- {
- if (req->terminate && req->hdr.op != cancel_request)
- {
- dnssd_sockaddr_t cliaddr;
-#if defined(USE_TCP_LOOPBACK)
- mDNSOpaque16 port;
- u_long opt = 1;
- port.b[0] = req->msgptr[0];
- port.b[1] = req->msgptr[1];
- req->msgptr += 2;
- cliaddr.sin_family = AF_INET;
- cliaddr.sin_port = port.NotAnInteger;
- cliaddr.sin_addr.s_addr = inet_addr(MDNS_TCP_SERVERADDR);
-#else
- char ctrl_path[MAX_CTLPATH];
- get_string(&req->msgptr, req->msgend, ctrl_path, MAX_CTLPATH); // path is first element in message buffer
- mDNSPlatformMemZero(&cliaddr, sizeof(cliaddr));
- cliaddr.sun_family = AF_LOCAL;
- mDNSPlatformStrCopy(cliaddr.sun_path, ctrl_path);
- // If the error return path UDS name is empty string, that tells us
- // that this is a new version of the library that's going to pass us
- // the error return path socket via sendmsg/recvmsg
- if (ctrl_path[0] == 0)
- {
- if (req->errsd == req->sd)
- { LogMsg("%3d: read_msg: ERROR failed to get errsd via SCM_RIGHTS", req->sd); req->ts = t_error; return; }
- goto got_errfd;
- }
-#endif
-
- req->errsd = socket(AF_DNSSD, SOCK_STREAM, 0);
- if (!dnssd_SocketValid(req->errsd)) { my_perror("ERROR: socket"); req->ts = t_error; return; }
-
- if (connect(req->errsd, (struct sockaddr *)&cliaddr, sizeof(cliaddr)) < 0)
- {
-#if !defined(USE_TCP_LOOPBACK)
- struct stat sb;
- LogMsg("%3d: read_msg: Couldn't connect to error return path socket '%s' errno %d (%s)",
- req->sd, cliaddr.sun_path, dnssd_errno, dnssd_strerror(dnssd_errno));
- if (stat(cliaddr.sun_path, &sb) < 0)
- LogMsg("%3d: read_msg: stat failed '%s' errno %d (%s)", req->sd, cliaddr.sun_path, dnssd_errno, dnssd_strerror(dnssd_errno));
- else
- LogMsg("%3d: read_msg: file '%s' mode %o (octal) uid %d gid %d", req->sd, cliaddr.sun_path, sb.st_mode, sb.st_uid, sb.st_gid);
-#endif
- req->ts = t_error;
- return;
- }
-
-#if !defined(USE_TCP_LOOPBACK)
-got_errfd:
-#endif
- LogOperation("%3d: Error socket %d created %08X %08X", req->sd, req->errsd, req->hdr.client_context.u32[1], req->hdr.client_context.u32[0]);
-#if defined(_WIN32)
- if (ioctlsocket(req->errsd, FIONBIO, &opt) != 0)
-#else
- if (fcntl(req->errsd, F_SETFL, fcntl(req->errsd, F_GETFL, 0) | O_NONBLOCK) != 0)
-#endif
- {
- LogMsg("%3d: ERROR: could not set control socket to non-blocking mode errno %d (%s)",
- req->sd, dnssd_errno, dnssd_strerror(dnssd_errno));
- req->ts = t_error;
- return;
- }
- }
-
- req->ts = t_complete;
- }
-
- return;
-
-rerror:
- if (dnssd_errno == dnssd_EWOULDBLOCK || dnssd_errno == dnssd_EINTR) return;
- LogMsg("%3d: ERROR: read_msg errno %d (%s)", req->sd, dnssd_errno, dnssd_strerror(dnssd_errno));
- req->ts = t_error;
- }
-
-#define RecordOrientedOp(X) \
- ((X) == reg_record_request || (X) == add_record_request || (X) == update_record_request || (X) == remove_record_request)
-
-// The lightweight operations are the ones that don't need a dedicated request_state structure allocated for them
-#define LightweightOp(X) (RecordOrientedOp(X) || (X) == cancel_request)
-
-mDNSlocal void request_callback(int fd, short filter, void *info)
- {
- mStatus err = 0;
- request_state *req = info;
- mDNSs32 min_size = sizeof(DNSServiceFlags);
- (void)fd; // Unused
- (void)filter; // Unused
-
- for (;;)
- {
- read_msg(req);
- if (req->ts == t_morecoming) return;
- if (req->ts == t_terminated || req->ts == t_error) { AbortUnlinkAndFree(req); return; }
- if (req->ts != t_complete) { LogMsg("req->ts %d != t_complete", req->ts); AbortUnlinkAndFree(req); return; }
-
- if (req->hdr.version != VERSION)
- {
- LogMsg("ERROR: client version %d incompatible with daemon version %d", req->hdr.version, VERSION);
- AbortUnlinkAndFree(req);
- return;
- }
-
- switch(req->hdr.op) // Interface + other data
- {
- case connection_request: min_size = 0; break;
- case reg_service_request: min_size += sizeof(mDNSu32) + 4 /* name, type, domain, host */ + 4 /* port, textlen */; break;
- case add_record_request: min_size += 4 /* type, rdlen */ + 4 /* ttl */; break;
- case update_record_request: min_size += 2 /* rdlen */ + 4 /* ttl */; break;
- case remove_record_request: break;
- case browse_request: min_size += sizeof(mDNSu32) + 2 /* type, domain */; break;
- case resolve_request: min_size += sizeof(mDNSu32) + 3 /* type, type, domain */; break;
- case query_request: min_size += sizeof(mDNSu32) + 1 /* name */ + 4 /* type, class*/; break;
- case enumeration_request: min_size += sizeof(mDNSu32); break;
- case reg_record_request: min_size += sizeof(mDNSu32) + 1 /* name */ + 6 /* type, class, rdlen */ + 4 /* ttl */; break;
- case reconfirm_record_request: min_size += sizeof(mDNSu32) + 1 /* name */ + 6 /* type, class, rdlen */; break;
- case setdomain_request: min_size += 1 /* domain */; break;
- case getproperty_request: min_size = 2; break;
- case port_mapping_request: min_size += sizeof(mDNSu32) + 4 /* udp/tcp */ + 4 /* int/ext port */ + 4 /* ttl */; break;
- case addrinfo_request: min_size += sizeof(mDNSu32) + 4 /* v4/v6 */ + 1 /* hostname */; break;
- case send_bpf: // Same as cancel_request below
- case cancel_request: min_size = 0; break;
- default: LogMsg("ERROR: validate_message - unsupported req type: %d", req->hdr.op); min_size = -1; break;
- }
-
- if ((mDNSs32)req->data_bytes < min_size)
- { LogMsg("Invalid message %d bytes; min for %d is %d", req->data_bytes, req->hdr.op, min_size); AbortUnlinkAndFree(req); return; }
-
- if (LightweightOp(req->hdr.op) && !req->terminate)
- { LogMsg("Reg/Add/Update/Remove %d require existing connection", req->hdr.op); AbortUnlinkAndFree(req); return; }
-
- // check if client wants silent operation
- if (req->hdr.ipc_flags & IPC_FLAGS_NOREPLY) req->no_reply = 1;
-
- // If req->terminate is already set, this means this operation is sharing an existing connection
- if (req->terminate && !LightweightOp(req->hdr.op))
- {
- request_state *newreq = NewRequest();
- newreq->primary = req;
- newreq->sd = req->sd;
- newreq->errsd = req->errsd;
- newreq->uid = req->uid;
- newreq->hdr = req->hdr;
- newreq->msgbuf = req->msgbuf;
- newreq->msgptr = req->msgptr;
- newreq->msgend = req->msgend;
- req = newreq;
- }
-
- // If we're shutting down, don't allow new client requests
- // We do allow "cancel" and "getproperty" during shutdown
- if (mDNSStorage.ShutdownTime && req->hdr.op != cancel_request && req->hdr.op != getproperty_request)
- {
- err = mStatus_ServiceNotRunning;
- }
- else switch(req->hdr.op)
- {
- // These are all operations that have their own first-class request_state object
- case connection_request: LogOperation("%3d: DNSServiceCreateConnection START", req->sd);
- req->terminate = connection_termination; break;
- case resolve_request: err = handle_resolve_request (req); break;
- case query_request: err = handle_queryrecord_request (req); break;
- case browse_request: err = handle_browse_request (req); break;
- case reg_service_request: err = handle_regservice_request (req); break;
- case enumeration_request: err = handle_enum_request (req); break;
- case reconfirm_record_request: err = handle_reconfirm_request (req); break;
- case setdomain_request: err = handle_setdomain_request (req); break;
- case getproperty_request: handle_getproperty_request (req); break;
- case port_mapping_request: err = handle_port_mapping_request(req); break;
- case addrinfo_request: err = handle_addrinfo_request (req); break;
- case send_bpf: /* Do nothing for send_bpf */ break;
-
- // These are all operations that work with an existing request_state object
- case reg_record_request: err = handle_regrecord_request (req); break;
- case add_record_request: err = handle_add_request (req); break;
- case update_record_request: err = handle_update_request (req); break;
- case remove_record_request: err = handle_removerecord_request(req); break;
- case cancel_request: handle_cancel_request (req); break;
- default: LogMsg("%3d: ERROR: Unsupported UDS req: %d", req->sd, req->hdr.op);
- }
-
- // req->msgbuf may be NULL, e.g. for connection_request or remove_record_request
- if (req->msgbuf) freeL("request_state msgbuf", req->msgbuf);
-
- // There's no return data for a cancel request (DNSServiceRefDeallocate returns no result)
- // For a DNSServiceGetProperty call, the handler already generated the response, so no need to do it again here
- if (req->hdr.op != cancel_request && req->hdr.op != getproperty_request && req->hdr.op != send_bpf)
- {
- const mStatus err_netorder = dnssd_htonl(err);
- send_all(req->errsd, (const char *)&err_netorder, sizeof(err_netorder));
- if (req->errsd != req->sd)
- {
- LogOperation("%3d: Error socket %d closed %08X %08X (%d)",
- req->sd, req->errsd, req->hdr.client_context.u32[1], req->hdr.client_context.u32[0], err);
- dnssd_close(req->errsd);
- req->errsd = req->sd;
- // Also need to reset the parent's errsd, if this is a subordinate operation
- if (req->primary) req->primary->errsd = req->primary->sd;
- }
- }
-
- // Reset ready to accept the next req on this pipe
- if (req->primary) req = req->primary;
- req->ts = t_morecoming;
- req->hdr_bytes = 0;
- req->data_bytes = 0;
- req->msgbuf = mDNSNULL;
- req->msgptr = mDNSNULL;
- req->msgend = 0;
- }
- }
-
-mDNSlocal void connect_callback(int fd, short filter, void *info)
- {
- dnssd_sockaddr_t cliaddr;
- dnssd_socklen_t len = (dnssd_socklen_t) sizeof(cliaddr);
- dnssd_sock_t sd = accept(fd, (struct sockaddr*) &cliaddr, &len);
-#if defined(SO_NOSIGPIPE) || defined(_WIN32)
- unsigned long optval = 1;
-#endif
-
- (void)filter; // Unused
- (void)info; // Unused
-
- if (!dnssd_SocketValid(sd))
- {
- if (dnssd_errno != dnssd_EWOULDBLOCK) my_perror("ERROR: accept");
- return;
- }
-
-#ifdef SO_NOSIGPIPE
- // Some environments (e.g. OS X) support turning off SIGPIPE for a socket
- if (setsockopt(sd, SOL_SOCKET, SO_NOSIGPIPE, &optval, sizeof(optval)) < 0)
- LogMsg("%3d: WARNING: setsockopt - SO_NOSIGPIPE %d (%s)", sd, dnssd_errno, dnssd_strerror(dnssd_errno));
-#endif
-
-#if defined(_WIN32)
- if (ioctlsocket(sd, FIONBIO, &optval) != 0)
-#else
- if (fcntl(sd, F_SETFL, fcntl(sd, F_GETFL, 0) | O_NONBLOCK) != 0)
-#endif
- {
- my_perror("ERROR: fcntl(sd, F_SETFL, O_NONBLOCK) - aborting client");
- dnssd_close(sd);
- return;
- }
- else
- {
- request_state *request = NewRequest();
- request->ts = t_morecoming;
- request->sd = sd;
- request->errsd = sd;
-#if APPLE_OSX_mDNSResponder
- struct xucred x;
- socklen_t xucredlen = sizeof(x);
- if (getsockopt(sd, 0, LOCAL_PEERCRED, &x, &xucredlen) >= 0 && x.cr_version == XUCRED_VERSION) request->uid = x.cr_uid;
- else my_perror("ERROR: getsockopt, LOCAL_PEERCRED");
- debugf("LOCAL_PEERCRED %d %u %u %d", xucredlen, x.cr_version, x.cr_uid, x.cr_ngroups);
-#endif // APPLE_OSX_mDNSResponder
- LogOperation("%3d: Adding FD for uid %u", request->sd, request->uid);
- udsSupportAddFDToEventLoop(sd, request_callback, request, &request->platform_data);
- }
- }
-
-mDNSlocal mDNSBool uds_socket_setup(dnssd_sock_t skt)
- {
-#if defined(SO_NP_EXTENSIONS)
- struct so_np_extensions sonpx;
- socklen_t optlen = sizeof(struct so_np_extensions);
- sonpx.npx_flags = SONPX_SETOPTSHUT;
- sonpx.npx_mask = SONPX_SETOPTSHUT;
- if (setsockopt(skt, SOL_SOCKET, SO_NP_EXTENSIONS, &sonpx, optlen) < 0)
- my_perror("WARNING: could not set sockopt - SO_NP_EXTENSIONS");
-#endif
-#if defined(_WIN32)
- // SEH: do we even need to do this on windows?
- // This socket will be given to WSAEventSelect which will automatically set it to non-blocking
- u_long opt = 1;
- if (ioctlsocket(skt, FIONBIO, &opt) != 0)
-#else
- if (fcntl(skt, F_SETFL, fcntl(skt, F_GETFL, 0) | O_NONBLOCK) != 0)
-#endif
- {
- my_perror("ERROR: could not set listen socket to non-blocking mode");
- return mDNSfalse;
- }
-
- if (listen(skt, LISTENQ) != 0)
- {
- my_perror("ERROR: could not listen on listen socket");
- return mDNSfalse;
- }
-
- if (mStatus_NoError != udsSupportAddFDToEventLoop(skt, connect_callback, (void *) NULL, (void **) NULL))
- {
- my_perror("ERROR: could not add listen socket to event loop");
- return mDNSfalse;
- }
- else LogOperation("%3d: Listening for incoming Unix Domain Socket client requests", skt);
-
- return mDNStrue;
- }
-
-mDNSexport int udsserver_init(dnssd_sock_t skts[], mDNSu32 count)
- {
- dnssd_sockaddr_t laddr;
- int ret;
- mDNSu32 i = 0;
-
- LogInfo("udsserver_init");
-
- // If a particular platform wants to opt out of having a PID file, define PID_FILE to be ""
- if (PID_FILE[0])
- {
- FILE *fp = fopen(PID_FILE, "w");
- if (fp != NULL)
- {
- fprintf(fp, "%d\n", getpid());
- fclose(fp);
- }
- }
-
- if (skts)
- {
- for (i = 0; i < count; i++)
- if (dnssd_SocketValid(skts[i]) && !uds_socket_setup(skts[i]))
- goto error;
- }
- else
- {
- listenfd = socket(AF_DNSSD, SOCK_STREAM, 0);
- if (!dnssd_SocketValid(listenfd))
- {
- my_perror("ERROR: socket(AF_DNSSD, SOCK_STREAM, 0); failed");
- goto error;
- }
-
- mDNSPlatformMemZero(&laddr, sizeof(laddr));
-
- #if defined(USE_TCP_LOOPBACK)
- {
- laddr.sin_family = AF_INET;
- laddr.sin_port = htons(MDNS_TCP_SERVERPORT);
- laddr.sin_addr.s_addr = inet_addr(MDNS_TCP_SERVERADDR);
- ret = bind(listenfd, (struct sockaddr *) &laddr, sizeof(laddr));
- if (ret < 0)
- {
- my_perror("ERROR: bind(listenfd, (struct sockaddr *) &laddr, sizeof(laddr)); failed");
- goto error;
- }
- }
- #else
- {
- mode_t mask = umask(0);
- unlink(MDNS_UDS_SERVERPATH); // OK if this fails
- laddr.sun_family = AF_LOCAL;
- #ifndef NOT_HAVE_SA_LEN
- // According to Stevens (section 3.2), there is no portable way to
- // determine whether sa_len is defined on a particular platform.
- laddr.sun_len = sizeof(struct sockaddr_un);
- #endif
- mDNSPlatformStrCopy(laddr.sun_path, MDNS_UDS_SERVERPATH);
- ret = bind(listenfd, (struct sockaddr *) &laddr, sizeof(laddr));
- umask(mask);
- if (ret < 0)
- {
- my_perror("ERROR: bind(listenfd, (struct sockaddr *) &laddr, sizeof(laddr)); failed");
- goto error;
- }
- }
- #endif
-
- if (!uds_socket_setup(listenfd)) goto error;
- }
-
-#if !defined(PLATFORM_NO_RLIMIT)
- {
- // Set maximum number of open file descriptors
- #define MIN_OPENFILES 10240
- struct rlimit maxfds, newfds;
-
- // Due to bugs in OS X (<rdar://problem/2941095>, <rdar://problem/3342704>, <rdar://problem/3839173>)
- // you have to get and set rlimits once before getrlimit will return sensible values
- if (getrlimit(RLIMIT_NOFILE, &maxfds) < 0) { my_perror("ERROR: Unable to get file descriptor limit"); return 0; }
- if (setrlimit(RLIMIT_NOFILE, &maxfds) < 0) my_perror("ERROR: Unable to set maximum file descriptor limit");
-
- if (getrlimit(RLIMIT_NOFILE, &maxfds) < 0) { my_perror("ERROR: Unable to get file descriptor limit"); return 0; }
- newfds.rlim_max = (maxfds.rlim_max > MIN_OPENFILES) ? maxfds.rlim_max : MIN_OPENFILES;
- newfds.rlim_cur = (maxfds.rlim_cur > MIN_OPENFILES) ? maxfds.rlim_cur : MIN_OPENFILES;
- if (newfds.rlim_max != maxfds.rlim_max || newfds.rlim_cur != maxfds.rlim_cur)
- if (setrlimit(RLIMIT_NOFILE, &newfds) < 0) my_perror("ERROR: Unable to set maximum file descriptor limit");
-
- if (getrlimit(RLIMIT_NOFILE, &maxfds) < 0) { my_perror("ERROR: Unable to get file descriptor limit"); return 0; }
- debugf("maxfds.rlim_max %d", (long)maxfds.rlim_max);
- debugf("maxfds.rlim_cur %d", (long)maxfds.rlim_cur);
- }
-#endif
-
- // We start a "LocalOnly" query looking for Automatic Browse Domain records.
- // When Domain Enumeration in uDNS.c finds an "lb" record from the network, its "FoundDomain" routine
- // creates a "LocalOnly" record, which results in our AutomaticBrowseDomainChange callback being invoked
- mDNS_GetDomains(&mDNSStorage, &mDNSStorage.AutomaticBrowseDomainQ, mDNS_DomainTypeBrowseAutomatic,
- mDNSNULL, mDNSInterface_LocalOnly, AutomaticBrowseDomainChange, mDNSNULL);
-
- // Add "local" as recommended registration domain ("dns-sd -E"), recommended browsing domain ("dns-sd -F"), and automatic browsing domain
- RegisterLocalOnlyDomainEnumPTR(&mDNSStorage, &localdomain, mDNS_DomainTypeRegistration);
- RegisterLocalOnlyDomainEnumPTR(&mDNSStorage, &localdomain, mDNS_DomainTypeBrowse);
- AddAutoBrowseDomain(0, &localdomain);
-
- udsserver_handle_configchange(&mDNSStorage);
- return 0;
-
-error:
-
- my_perror("ERROR: udsserver_init");
- return -1;
- }
-
-mDNSexport int udsserver_exit(void)
- {
- // Cancel all outstanding client requests
- while (all_requests) AbortUnlinkAndFree(all_requests);
-
- // Clean up any special mDNSInterface_LocalOnly records we created, both the entries for "local" we
- // created in udsserver_init, and others we created as a result of reading local configuration data
- while (LocalDomainEnumRecords)
- {
- ARListElem *rem = LocalDomainEnumRecords;
- LocalDomainEnumRecords = LocalDomainEnumRecords->next;
- mDNS_Deregister(&mDNSStorage, &rem->ar);
- }
-
- // If the launching environment created no listening socket,
- // that means we created it ourselves, so we should clean it up on exit
- if (dnssd_SocketValid(listenfd))
- {
- dnssd_close(listenfd);
-#if !defined(USE_TCP_LOOPBACK)
- // Currently, we're unable to remove /var/run/mdnsd because we've changed to userid "nobody"
- // to give up unnecessary privilege, but we need to be root to remove this Unix Domain Socket.
- // It would be nice if we could find a solution to this problem
- if (unlink(MDNS_UDS_SERVERPATH))
- debugf("Unable to remove %s", MDNS_UDS_SERVERPATH);
-#endif
- }
-
- if (PID_FILE[0]) unlink(PID_FILE);
-
- return 0;
- }
-
-mDNSlocal void LogClientInfo(mDNS *const m, const request_state *req)
- {
- char prefix[16];
- if (req->primary) mDNS_snprintf(prefix, sizeof(prefix), " -> ");
- else mDNS_snprintf(prefix, sizeof(prefix), "%3d:", req->sd);
-
- usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000);
-
- if (!req->terminate)
- LogMsgNoIdent("%s No operation yet on this socket", prefix);
- else if (req->terminate == connection_termination)
- {
- int num_records = 0, num_ops = 0;
- const registered_record_entry *p;
- const request_state *r;
- for (p = req->u.reg_recs; p; p=p->next) num_records++;
- for (r = req->next; r; r=r->next) if (r->primary == req) num_ops++;
- LogMsgNoIdent("%s DNSServiceCreateConnection: %d registered record%s, %d kDNSServiceFlagsShareConnection operation%s", prefix,
- num_records, num_records != 1 ? "s" : "",
- num_ops, num_ops != 1 ? "s" : "");
- for (p = req->u.reg_recs; p; p=p->next)
- LogMsgNoIdent(" -> DNSServiceRegisterRecord %3d %s", p->key, ARDisplayString(m, p->rr));
- for (r = req->next; r; r=r->next) if (r->primary == req) LogClientInfo(m, r);
- }
- else if (req->terminate == regservice_termination_callback)
- {
- service_instance *ptr;
- for (ptr = req->u.servicereg.instances; ptr; ptr = ptr->next)
- LogMsgNoIdent("%s DNSServiceRegister %##s %u/%u",
- (ptr == req->u.servicereg.instances) ? prefix : " ",
- ptr->srs.RR_SRV.resrec.name->c, mDNSVal16(req->u.servicereg.port), SRS_PORT(&ptr->srs));
- }
- else if (req->terminate == browse_termination_callback)
- {
- browser_t *blist;
- for (blist = req->u.browser.browsers; blist; blist = blist->next)
- LogMsgNoIdent("%s DNSServiceBrowse %##s", (blist == req->u.browser.browsers) ? prefix : " ", blist->q.qname.c);
- }
- else if (req->terminate == resolve_termination_callback)
- LogMsgNoIdent("%s DNSServiceResolve %##s", prefix, req->u.resolve.qsrv.qname.c);
- else if (req->terminate == queryrecord_termination_callback)
- LogMsgNoIdent("%s DNSServiceQueryRecord %##s (%s)", prefix, req->u.queryrecord.q.qname.c, DNSTypeName(req->u.queryrecord.q.qtype));
- else if (req->terminate == enum_termination_callback)
- LogMsgNoIdent("%s DNSServiceEnumerateDomains %##s", prefix, req->u.enumeration.q_all.qname.c);
- else if (req->terminate == port_mapping_termination_callback)
- LogMsgNoIdent("%s DNSServiceNATPortMapping %.4a %s%s Int %d Req %d Ext %d Req TTL %d Granted TTL %d",
- prefix,
- &req->u.pm.NATinfo.ExternalAddress,
- req->u.pm.NATinfo.Protocol & NATOp_MapTCP ? "TCP" : " ",
- req->u.pm.NATinfo.Protocol & NATOp_MapUDP ? "UDP" : " ",
- mDNSVal16(req->u.pm.NATinfo.IntPort),
- mDNSVal16(req->u.pm.ReqExt),
- mDNSVal16(req->u.pm.NATinfo.ExternalPort),
- req->u.pm.NATinfo.NATLease,
- req->u.pm.NATinfo.Lifetime);
- else if (req->terminate == addrinfo_termination_callback)
- LogMsgNoIdent("%s DNSServiceGetAddrInfo %s%s %##s", prefix,
- req->u.addrinfo.protocol & kDNSServiceProtocol_IPv4 ? "v4" : " ",
- req->u.addrinfo.protocol & kDNSServiceProtocol_IPv6 ? "v6" : " ",
- req->u.addrinfo.q4.qname.c);
- else
- LogMsgNoIdent("%s Unrecognized operation %p", prefix, req->terminate);
- }
-
-mDNSlocal char *RecordTypeName(mDNSu8 rtype)
- {
- switch (rtype)
- {
- case kDNSRecordTypeUnregistered: return ("Unregistered ");
- case kDNSRecordTypeDeregistering: return ("Deregistering");
- case kDNSRecordTypeUnique: return ("Unique ");
- case kDNSRecordTypeAdvisory: return ("Advisory ");
- case kDNSRecordTypeShared: return ("Shared ");
- case kDNSRecordTypeVerified: return ("Verified ");
- case kDNSRecordTypeKnownUnique: return ("KnownUnique ");
- default: return("Unknown");
- }
- }
-
-mDNSlocal void LogEtcHosts(mDNS *const m)
- {
- mDNSBool showheader = mDNStrue;
- const AuthRecord *ar;
- mDNSu32 slot;
- AuthGroup *ag;
- int count = 0;
- int authslot = 0;
- mDNSBool truncated = 0;
-
- for (slot = 0; slot < AUTH_HASH_SLOTS; slot++)
- {
- if (m->rrauth.rrauth_hash[slot]) authslot++;
- for (ag = m->rrauth.rrauth_hash[slot]; ag; ag = ag->next)
- for (ar = ag->members; ar; ar = ar->next)
- {
- if (ar->RecordCallback != FreeEtcHosts) continue;
- if (showheader) { showheader = mDNSfalse; LogMsgNoIdent(" State Interface"); }
-
- // Print a maximum of 50 records
- if (count++ >= 50) { truncated = mDNStrue; continue; }
- if (ar->ARType == AuthRecordLocalOnly)
- {
- if (ar->resrec.InterfaceID == mDNSInterface_LocalOnly)
- LogMsgNoIdent(" %s LO %s", RecordTypeName(ar->resrec.RecordType), ARDisplayString(m, ar));
- else
- {
- mDNSu32 scopeid = (mDNSu32)(uintptr_t)ar->resrec.InterfaceID;
- LogMsgNoIdent(" %s %u %s", RecordTypeName(ar->resrec.RecordType), scopeid, ARDisplayString(m, ar));
- }
- }
- usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000);
- }
- }
-
- if (showheader) LogMsgNoIdent("<None>");
- else if (truncated) LogMsgNoIdent("<Truncated: to 50 records, Total records %d, Total Auth Groups %d, Auth Slots %d>", count, m->rrauth.rrauth_totalused, authslot);
- }
-
-mDNSlocal void LogLocalOnlyAuthRecords(mDNS *const m)
- {
- mDNSBool showheader = mDNStrue;
- const AuthRecord *ar;
- mDNSu32 slot;
- AuthGroup *ag;
-
- for (slot = 0; slot < AUTH_HASH_SLOTS; slot++)
- {
- for (ag = m->rrauth.rrauth_hash[slot]; ag; ag = ag->next)
- for (ar = ag->members; ar; ar = ar->next)
- {
- if (ar->RecordCallback == FreeEtcHosts) continue;
- if (showheader) { showheader = mDNSfalse; LogMsgNoIdent(" State Interface"); }
-
- // Print a maximum of 400 records
- if (ar->ARType == AuthRecordLocalOnly)
- LogMsgNoIdent(" %s LO %s", RecordTypeName(ar->resrec.RecordType), ARDisplayString(m, ar));
- else if (ar->ARType == AuthRecordP2P)
- LogMsgNoIdent(" %s PP %s", RecordTypeName(ar->resrec.RecordType), ARDisplayString(m, ar));
- usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000);
- }
- }
-
- if (showheader) LogMsgNoIdent("<None>");
- }
-
-mDNSlocal void LogAuthRecords(mDNS *const m, const mDNSs32 now, AuthRecord *ResourceRecords, int *proxy)
- {
- mDNSBool showheader = mDNStrue;
- const AuthRecord *ar;
- OwnerOptData owner = zeroOwner;
- for (ar = ResourceRecords; ar; ar=ar->next)
- {
- const char *const ifname = InterfaceNameForID(m, ar->resrec.InterfaceID);
- if ((ar->WakeUp.HMAC.l[0] != 0) == (proxy != mDNSNULL))
- {
- if (showheader) { showheader = mDNSfalse; LogMsgNoIdent(" Int Next Expire State"); }
- if (proxy) (*proxy)++;
- if (!mDNSPlatformMemSame(&owner, &ar->WakeUp, sizeof(owner)))
- {
- owner = ar->WakeUp;
- if (owner.password.l[0])
- LogMsgNoIdent("Proxying for H-MAC %.6a I-MAC %.6a Password %.6a seq %d", &owner.HMAC, &owner.IMAC, &owner.password, owner.seq);
- else if (!mDNSSameEthAddress(&owner.HMAC, &owner.IMAC))
- LogMsgNoIdent("Proxying for H-MAC %.6a I-MAC %.6a seq %d", &owner.HMAC, &owner.IMAC, owner.seq);
- else
- LogMsgNoIdent("Proxying for %.6a seq %d", &owner.HMAC, owner.seq);
- }
- if (AuthRecord_uDNS(ar))
- LogMsgNoIdent("%7d %7d %7d %7d %s",
- ar->ThisAPInterval / mDNSPlatformOneSecond,
- (ar->LastAPTime + ar->ThisAPInterval - now) / mDNSPlatformOneSecond,
- ar->expire ? (ar->expire - now) / mDNSPlatformOneSecond : 0,
- ar->state, ARDisplayString(m, ar));
- else if (ar->ARType == AuthRecordLocalOnly)
- LogMsgNoIdent(" LO %s", ARDisplayString(m, ar));
- else if (ar->ARType == AuthRecordP2P)
- LogMsgNoIdent(" PP %s", ARDisplayString(m, ar));
- else
- LogMsgNoIdent("%7d %7d %7d %7s %s",
- ar->ThisAPInterval / mDNSPlatformOneSecond,
- ar->AnnounceCount ? (ar->LastAPTime + ar->ThisAPInterval - now) / mDNSPlatformOneSecond : 0,
- ar->TimeExpire ? (ar->TimeExpire - now) / mDNSPlatformOneSecond : 0,
- ifname ? ifname : "ALL",
- ARDisplayString(m, ar));
- usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000);
- }
- }
- if (showheader) LogMsgNoIdent("<None>");
- }
-
-mDNSexport void udsserver_info(mDNS *const m)
- {
- const mDNSs32 now = mDNS_TimeNow(m);
- mDNSu32 CacheUsed = 0, CacheActive = 0, slot;
- int ProxyA = 0, ProxyD = 0;
- const CacheGroup *cg;
- const CacheRecord *cr;
- const DNSQuestion *q;
- const DNameListElem *d;
- const SearchListElem *s;
-
- LogMsgNoIdent("Timenow 0x%08lX (%d)", (mDNSu32)now, now);
-
- LogMsgNoIdent("------------ Cache -------------");
- LogMsgNoIdent("Slt Q TTL if U Type rdlen");
- for (slot = 0; slot < CACHE_HASH_SLOTS; slot++)
- for (cg = m->rrcache_hash[slot]; cg; cg=cg->next)
- {
- CacheUsed++; // Count one cache entity for the CacheGroup object
- for (cr = cg->members; cr; cr=cr->next)
- {
- const mDNSs32 remain = cr->resrec.rroriginalttl - (now - cr->TimeRcvd) / mDNSPlatformOneSecond;
- const char *ifname;
- mDNSInterfaceID InterfaceID = cr->resrec.InterfaceID;
- if (!InterfaceID && cr->resrec.rDNSServer)
- InterfaceID = cr->resrec.rDNSServer->interface;
- ifname = InterfaceNameForID(m, InterfaceID);
- CacheUsed++;
- if (cr->CRActiveQuestion) CacheActive++;
- LogMsgNoIdent("%3d %s%8ld %-7s%s %-6s%s",
- slot,
- cr->CRActiveQuestion ? "*" : " ",
- remain,
- ifname ? ifname : "-U-",
- (cr->resrec.RecordType == kDNSRecordTypePacketNegative) ? "-" :
- (cr->resrec.RecordType & kDNSRecordTypePacketUniqueMask) ? " " : "+",
- DNSTypeName(cr->resrec.rrtype),
- CRDisplayString(m, cr));
- usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000);
- }
- }
-
- if (m->rrcache_totalused != CacheUsed)
- LogMsgNoIdent("Cache use mismatch: rrcache_totalused is %lu, true count %lu", m->rrcache_totalused, CacheUsed);
- if (m->rrcache_active != CacheActive)
- LogMsgNoIdent("Cache use mismatch: rrcache_active is %lu, true count %lu", m->rrcache_active, CacheActive);
- LogMsgNoIdent("Cache currently contains %lu entities; %lu referenced by active questions", CacheUsed, CacheActive);
-
- LogMsgNoIdent("--------- Auth Records ---------");
- LogAuthRecords(m, now, m->ResourceRecords, mDNSNULL);
-
- LogMsgNoIdent("--------- LocalOnly, P2P Auth Records ---------");
- LogLocalOnlyAuthRecords(m);
-
- LogMsgNoIdent("--------- /etc/hosts ---------");
- LogEtcHosts(m);
-
- LogMsgNoIdent("------ Duplicate Records -------");
- LogAuthRecords(m, now, m->DuplicateRecords, mDNSNULL);
-
- LogMsgNoIdent("----- Auth Records Proxied -----");
- LogAuthRecords(m, now, m->ResourceRecords, &ProxyA);
-
- LogMsgNoIdent("-- Duplicate Records Proxied ---");
- LogAuthRecords(m, now, m->DuplicateRecords, &ProxyD);
-
- LogMsgNoIdent("---------- Questions -----------");
- if (!m->Questions) LogMsgNoIdent("<None>");
- else
- {
- CacheUsed = 0;
- CacheActive = 0;
- LogMsgNoIdent(" Int Next if T NumAns VDNS Qptr DupOf SU SQ Type Name");
- for (q = m->Questions; q; q=q->next)
- {
- mDNSs32 i = q->ThisQInterval / mDNSPlatformOneSecond;
- mDNSs32 n = (NextQSendTime(q) - now) / mDNSPlatformOneSecond;
- char *ifname = InterfaceNameForID(m, q->InterfaceID);
- CacheUsed++;
- if (q->ThisQInterval) CacheActive++;
- LogMsgNoIdent("%6d%6d %-7s%s%s %5d 0x%x%x 0x%p 0x%p %1d %2d %-5s%##s%s",
- i, n,
- ifname ? ifname : mDNSOpaque16IsZero(q->TargetQID) ? "" : "-U-",
- mDNSOpaque16IsZero(q->TargetQID) ? (q->LongLived ? "l" : " ") : (q->LongLived ? "L" : "O"),
- PrivateQuery(q) ? "P" : " ",
- q->CurrentAnswers, q->validDNSServers.l[1], q->validDNSServers.l[0], q, q->DuplicateOf,
- q->SuppressUnusable, q->SuppressQuery, DNSTypeName(q->qtype), q->qname.c, q->DuplicateOf ? " (dup)" : "");
- usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000);
- }
- LogMsgNoIdent("%lu question%s; %lu active", CacheUsed, CacheUsed > 1 ? "s" : "", CacheActive);
- }
-
- LogMsgNoIdent("----- Local-Only Questions -----");
- if (!m->LocalOnlyQuestions) LogMsgNoIdent("<None>");
- else for (q = m->LocalOnlyQuestions; q; q=q->next)
- LogMsgNoIdent(" %5d %-6s%##s%s",
- q->CurrentAnswers, DNSTypeName(q->qtype), q->qname.c, q->DuplicateOf ? " (dup)" : "");
-
- LogMsgNoIdent("---- Active Client Requests ----");
- if (!all_requests) LogMsgNoIdent("<None>");
- else
- {
- const request_state *req, *r;
- for (req = all_requests; req; req=req->next)
- {
- if (req->primary) // If this is a subbordinate operation, check that the parent is in the list
- {
- for (r = all_requests; r && r != req; r=r->next) if (r == req->primary) goto foundparent;
- LogMsgNoIdent("%3d: Orhpan operation %p; parent %p not found in request list", req->sd);
- }
- // For non-subbordinate operations, and subbordinate operations that have lost their parent, write out their info
- LogClientInfo(m, req);
- foundparent:;
- }
- }
-
- LogMsgNoIdent("-------- NAT Traversals --------");
- if (!m->NATTraversals) LogMsgNoIdent("<None>");
- else
- {
- const NATTraversalInfo *nat;
- for (nat = m->NATTraversals; nat; nat=nat->next)
- {
- if (nat->Protocol)
- LogMsgNoIdent("%p %s Int %5d Ext %5d Err %d Retry %5d Interval %5d Expire %5d",
- nat, nat->Protocol == NATOp_MapTCP ? "TCP" : "UDP",
- mDNSVal16(nat->IntPort), mDNSVal16(nat->ExternalPort), nat->Result,
- nat->retryPortMap ? (nat->retryPortMap - now) / mDNSPlatformOneSecond : 0,
- nat->retryInterval / mDNSPlatformOneSecond,
- nat->ExpiryTime ? (nat->ExpiryTime - now) / mDNSPlatformOneSecond : 0);
- else
- LogMsgNoIdent("%p Address Request Retry %5d Interval %5d", nat,
- (m->retryGetAddr - now) / mDNSPlatformOneSecond,
- m->retryIntervalGetAddr / mDNSPlatformOneSecond);
- usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000);
- }
- }
-
- LogMsgNoIdent("--------- AuthInfoList ---------");
- if (!m->AuthInfoList) LogMsgNoIdent("<None>");
- else
- {
- const DomainAuthInfo *a;
- for (a = m->AuthInfoList; a; a = a->next)
- LogMsgNoIdent("%##s %##s %##s %d %s", a->domain.c, a->keyname.c, a->hostname.c, (a->port.b[0] << 8 | a->port.b[1]), a->AutoTunnel ? a->AutoTunnel : "");
- }
-
- #if APPLE_OSX_mDNSResponder
- LogMsgNoIdent("--------- TunnelClients --------");
- if (!m->TunnelClients) LogMsgNoIdent("<None>");
- else
- {
- const ClientTunnel *c;
- for (c = m->TunnelClients; c; c = c->next)
- LogMsgNoIdent("%s %##s local %.16a %.4a %.16a remote %.16a %.4a %5d %.16a interval %d",
- c->prefix, c->dstname.c, &c->loc_inner, &c->loc_outer, &c->loc_outer6, &c->rmt_inner, &c->rmt_outer, mDNSVal16(c->rmt_outer_port), &c->rmt_outer6, c->q.ThisQInterval);
- }
- #endif // APPLE_OSX_mDNSResponder
-
- LogMsgNoIdent("---------- Misc State ----------");
-
- LogMsgNoIdent("PrimaryMAC: %.6a", &m->PrimaryMAC);
-
- LogMsgNoIdent("m->SleepState %d (%s) seq %d",
- m->SleepState,
- m->SleepState == SleepState_Awake ? "Awake" :
- m->SleepState == SleepState_Transferring ? "Transferring" :
- m->SleepState == SleepState_Sleeping ? "Sleeping" : "?",
- m->SleepSeqNum);
-
- if (!m->SPSSocket) LogMsgNoIdent("Not offering Sleep Proxy Service");
- else LogMsgNoIdent("Offering Sleep Proxy Service: %#s", m->SPSRecords.RR_SRV.resrec.name->c);
-
- if (m->ProxyRecords == ProxyA + ProxyD) LogMsgNoIdent("ProxyRecords: %d + %d = %d", ProxyA, ProxyD, ProxyA + ProxyD);
- else LogMsgNoIdent("ProxyRecords: MISMATCH %d + %d = %d != %d", ProxyA, ProxyD, ProxyA + ProxyD, m->ProxyRecords);
-
- LogMsgNoIdent("------ Auto Browse Domains -----");
- if (!AutoBrowseDomains) LogMsgNoIdent("<None>");
- else for (d=AutoBrowseDomains; d; d=d->next) LogMsgNoIdent("%##s", d->name.c);
-
- LogMsgNoIdent("--- Auto Registration Domains --");
- if (!AutoRegistrationDomains) LogMsgNoIdent("<None>");
- else for (d=AutoRegistrationDomains; d; d=d->next) LogMsgNoIdent("%##s", d->name.c);
-
- LogMsgNoIdent("--- Search Domains --");
- if (!SearchList) LogMsgNoIdent("<None>");
- else
- {
- for (s=SearchList; s; s=s->next)
- {
- char *ifname = InterfaceNameForID(m, s->InterfaceID);
- LogMsgNoIdent("%##s %s", s->domain.c, ifname ? ifname : "");
- }
- }
-
- LogMsgNoIdent("---- Task Scheduling Timers ----");
-
- if (!m->NewQuestions)
- LogMsgNoIdent("NewQuestion <NONE>");
- else
- LogMsgNoIdent("NewQuestion DelayAnswering %d %d %##s (%s)",
- m->NewQuestions->DelayAnswering, m->NewQuestions->DelayAnswering-now,
- m->NewQuestions->qname.c, DNSTypeName(m->NewQuestions->qtype));
-
- if (!m->NewLocalOnlyQuestions)
- LogMsgNoIdent("NewLocalOnlyQuestions <NONE>");
- else
- LogMsgNoIdent("NewLocalOnlyQuestions %##s (%s)",
- m->NewLocalOnlyQuestions->qname.c, DNSTypeName(m->NewLocalOnlyQuestions->qtype));
-
- if (!m->NewLocalRecords)
- LogMsgNoIdent("NewLocalRecords <NONE>");
- else
- LogMsgNoIdent("NewLocalRecords %02X %s", m->NewLocalRecords->resrec.RecordType, ARDisplayString(m, m->NewLocalRecords));
-
- LogMsgNoIdent("SPSProxyListChanged%s", m->SPSProxyListChanged ? "" : " <NONE>");
- LogMsgNoIdent("LocalRemoveEvents%s", m->LocalRemoveEvents ? "" : " <NONE>");
- LogMsgNoIdent("m->RegisterAutoTunnel6 %08X", m->RegisterAutoTunnel6);
- LogMsgNoIdent("m->AutoTunnelRelayAddrIn %.16a", &m->AutoTunnelRelayAddrIn);
- LogMsgNoIdent("m->AutoTunnelRelayAddrOut %.16a", &m->AutoTunnelRelayAddrOut);
-
-#define LogTimer(MSG,T) LogMsgNoIdent( MSG " %08X %11d %08X %11d", (T), (T), (T)-now, (T)-now)
-
- LogMsgNoIdent(" ABS (hex) ABS (dec) REL (hex) REL (dec)");
- LogMsgNoIdent("m->timenow %08X %11d", now, now);
- LogMsgNoIdent("m->timenow_adjust %08X %11d", m->timenow_adjust, m->timenow_adjust);
- LogTimer("m->NextScheduledEvent ", m->NextScheduledEvent);
-
-#ifndef UNICAST_DISABLED
- LogTimer("m->NextuDNSEvent ", m->NextuDNSEvent);
- LogTimer("m->NextSRVUpdate ", m->NextSRVUpdate);
- LogTimer("m->NextScheduledNATOp ", m->NextScheduledNATOp);
- LogTimer("m->retryGetAddr ", m->retryGetAddr);
-#endif
-
- LogTimer("m->NextCacheCheck ", m->NextCacheCheck);
- LogTimer("m->NextScheduledSPS ", m->NextScheduledSPS);
- LogTimer("m->NextScheduledSPRetry ", m->NextScheduledSPRetry);
- LogTimer("m->DelaySleep ", m->DelaySleep);
-
- LogTimer("m->NextScheduledQuery ", m->NextScheduledQuery);
- LogTimer("m->NextScheduledProbe ", m->NextScheduledProbe);
- LogTimer("m->NextScheduledResponse", m->NextScheduledResponse);
-
- LogTimer("m->SuppressSending ", m->SuppressSending);
- LogTimer("m->SuppressProbes ", m->SuppressProbes);
- LogTimer("m->ProbeFailTime ", m->ProbeFailTime);
- LogTimer("m->DelaySleep ", m->DelaySleep);
- LogTimer("m->SleepLimit ", m->SleepLimit);
- LogTimer("m->NextScheduledStopTime ", m->NextScheduledStopTime);
- }
-
-#if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING
-mDNSexport void uds_validatelists(void)
- {
- const request_state *req, *p;
- for (req = all_requests; req; req=req->next)
- {
- if (req->next == (request_state *)~0 || (req->sd < 0 && req->sd != -2))
- LogMemCorruption("UDS request list: %p is garbage (%d)", req, req->sd);
-
- if (req->primary == req)
- LogMemCorruption("UDS request list: req->primary should not point to self %p/%d", req, req->sd);
-
- if (req->primary && req->replies)
- LogMemCorruption("UDS request list: Subordinate request %p/%d/%p should not have replies (%p)",
- req, req->sd, req->primary && req->replies);
-
- p = req->primary;
- if ((long)p & 3)
- LogMemCorruption("UDS request list: req %p primary %p is misaligned (%d)", req, p, req->sd);
- else if (p && (p->next == (request_state *)~0 || (p->sd < 0 && p->sd != -2)))
- LogMemCorruption("UDS request list: req %p primary %p is garbage (%d)", req, p, p->sd);
-
- reply_state *rep;
- for (rep = req->replies; rep; rep=rep->next)
- if (rep->next == (reply_state *)~0)
- LogMemCorruption("UDS req->replies: %p is garbage", rep);
-
- if (req->terminate == connection_termination)
- {
- registered_record_entry *r;
- for (r = req->u.reg_recs; r; r=r->next)
- if (r->next == (registered_record_entry *)~0)
- LogMemCorruption("UDS req->u.reg_recs: %p is garbage", r);
- }
- else if (req->terminate == regservice_termination_callback)
- {
- service_instance *s;
- for (s = req->u.servicereg.instances; s; s=s->next)
- if (s->next == (service_instance *)~0)
- LogMemCorruption("UDS req->u.servicereg.instances: %p is garbage", s);
- }
- else if (req->terminate == browse_termination_callback)
- {
- browser_t *b;
- for (b = req->u.browser.browsers; b; b=b->next)
- if (b->next == (browser_t *)~0)
- LogMemCorruption("UDS req->u.browser.browsers: %p is garbage", b);
- }
- }
-
- DNameListElem *d;
- for (d = SCPrefBrowseDomains; d; d=d->next)
- if (d->next == (DNameListElem *)~0 || d->name.c[0] > 63)
- LogMemCorruption("SCPrefBrowseDomains: %p is garbage (%d)", d, d->name.c[0]);
-
- ARListElem *b;
- for (b = LocalDomainEnumRecords; b; b=b->next)
- if (b->next == (ARListElem *)~0 || b->ar.resrec.name->c[0] > 63)
- LogMemCorruption("LocalDomainEnumRecords: %p is garbage (%d)", b, b->ar.resrec.name->c[0]);
-
- for (d = AutoBrowseDomains; d; d=d->next)
- if (d->next == (DNameListElem *)~0 || d->name.c[0] > 63)
- LogMemCorruption("AutoBrowseDomains: %p is garbage (%d)", d, d->name.c[0]);
-
- for (d = AutoRegistrationDomains; d; d=d->next)
- if (d->next == (DNameListElem *)~0 || d->name.c[0] > 63)
- LogMemCorruption("AutoRegistrationDomains: %p is garbage (%d)", d, d->name.c[0]);
- }
-#endif // APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING
-
-mDNSlocal int send_msg(request_state *const req)
- {
- reply_state *const rep = req->replies; // Send the first waiting reply
- ssize_t nwriten;
- if (req->no_reply) return(t_complete);
-
- ConvertHeaderBytes(rep->mhdr);
- nwriten = send(req->sd, (char *)&rep->mhdr + rep->nwriten, rep->totallen - rep->nwriten, 0);
- ConvertHeaderBytes(rep->mhdr);
-
- if (nwriten < 0)
- {
- if (dnssd_errno == dnssd_EINTR || dnssd_errno == dnssd_EWOULDBLOCK) nwriten = 0;
- else
- {
-#if !defined(PLATFORM_NO_EPIPE)
- if (dnssd_errno == EPIPE)
- return(req->ts = t_terminated);
- else
-#endif
- {
- LogMsg("send_msg ERROR: failed to write %d of %d bytes to fd %d errno %d (%s)",
- rep->totallen - rep->nwriten, rep->totallen, req->sd, dnssd_errno, dnssd_strerror(dnssd_errno));
- return(t_error);
- }
- }
- }
- rep->nwriten += nwriten;
- return (rep->nwriten == rep->totallen) ? t_complete : t_morecoming;
- }
-
-mDNSexport mDNSs32 udsserver_idle(mDNSs32 nextevent)
- {
- mDNSs32 now = mDNS_TimeNow(&mDNSStorage);
- request_state **req = &all_requests;
-
- while (*req)
- {
- request_state *const r = *req;
-
- if (r->terminate == resolve_termination_callback)
- if (r->u.resolve.ReportTime && now - r->u.resolve.ReportTime >= 0)
- {
- r->u.resolve.ReportTime = 0;
- LogMsgNoIdent("Client application bug: DNSServiceResolve(%##s) active for over two minutes. "
- "This places considerable burden on the network.", r->u.resolve.qsrv.qname.c);
- }
-
- // Note: Only primary req's have reply lists, not subordinate req's.
- while (r->replies) // Send queued replies
- {
- transfer_state result;
- if (r->replies->next) r->replies->rhdr->flags |= dnssd_htonl(kDNSServiceFlagsMoreComing);
- result = send_msg(r); // Returns t_morecoming if buffer full because client is not reading
- if (result == t_complete)
- {
- reply_state *fptr = r->replies;
- r->replies = r->replies->next;
- freeL("reply_state/udsserver_idle", fptr);
- r->time_blocked = 0; // reset failure counter after successful send
- r->unresponsiveness_reports = 0;
- continue;
- }
- else if (result == t_terminated || result == t_error)
- {
- LogMsg("%3d: Could not write data to client because of error - aborting connection", r->sd);
- LogClientInfo(&mDNSStorage, r);
- abort_request(r);
- }
- break;
- }
-
- if (r->replies) // If we failed to send everything, check our time_blocked timer
- {
- if (nextevent - now > mDNSPlatformOneSecond) nextevent = now + mDNSPlatformOneSecond;
-
- if (mDNSStorage.SleepState != SleepState_Awake) r->time_blocked = 0;
- else if (!r->time_blocked) r->time_blocked = NonZeroTime(now);
- else if (now - r->time_blocked >= 10 * mDNSPlatformOneSecond * (r->unresponsiveness_reports+1))
- {
- int num = 0;
- struct reply_state *x = r->replies;
- while (x) { num++; x=x->next; }
- LogMsg("%3d: Could not write data to client after %ld seconds, %d repl%s waiting",
- r->sd, (now - r->time_blocked) / mDNSPlatformOneSecond, num, num == 1 ? "y" : "ies");
- if (++r->unresponsiveness_reports >= 60)
- {
- LogMsg("%3d: Client unresponsive; aborting connection", r->sd);
- LogClientInfo(&mDNSStorage, r);
- abort_request(r);
- }
- }
- }
-
- if (!dnssd_SocketValid(r->sd)) // If this request is finished, unlink it from the list and free the memory
- {
- // Since we're already doing a list traversal, we unlink the request directly instead of using AbortUnlinkAndFree()
- *req = r->next;
- freeL("request_state/udsserver_idle", r);
- }
- else
- req = &r->next;
- }
- return nextevent;
- }
-
-struct CompileTimeAssertionChecks_uds_daemon
- {
- // Check our structures are reasonable sizes. Including overly-large buffers, or embedding
- // other overly-large structures instead of having a pointer to them, can inadvertently
- // cause structure sizes (and therefore memory usage) to balloon unreasonably.
- char sizecheck_request_state [(sizeof(request_state) <= 1784) ? 1 : -1];
- char sizecheck_registered_record_entry[(sizeof(registered_record_entry) <= 60) ? 1 : -1];
- char sizecheck_service_instance [(sizeof(service_instance) <= 6552) ? 1 : -1];
- char sizecheck_browser_t [(sizeof(browser_t) <= 1050) ? 1 : -1];
- char sizecheck_reply_hdr [(sizeof(reply_hdr) <= 12) ? 1 : -1];
- char sizecheck_reply_state [(sizeof(reply_state) <= 64) ? 1 : -1];
- };
diff --git a/src/tools/mdnssd/uds_daemon.h b/src/tools/mdnssd/uds_daemon.h
deleted file mode 100644
index 1e17efa1053..00000000000
--- a/src/tools/mdnssd/uds_daemon.h
+++ /dev/null
@@ -1,80 +0,0 @@
-/* -*- Mode: C; tab-width: 4 -*-
- *
- * Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
-
- File: uds_daemon.h
-
- Contains: Interfaces necessary to talk to uds_daemon.c.
-
- Version: 1.0
-
- */
-
-#include "mDNSEmbeddedAPI.h"
-#include "dnssd_ipc.h"
-
-/* Client interface: */
-
-#define SRS_PORT(S) mDNSVal16((S)->RR_SRV.resrec.rdata->u.srv.port)
-
-extern int udsserver_init(dnssd_sock_t skts[], mDNSu32 count);
-extern mDNSs32 udsserver_idle(mDNSs32 nextevent);
-extern void udsserver_info(mDNS *const m); // print out info about current state
-extern void udsserver_handle_configchange(mDNS *const m);
-extern int udsserver_exit(void); // should be called prior to app exit
-
-/* Routines that uds_daemon expects to link against: */
-
-typedef void (*udsEventCallback)(int fd, short filter, void *context);
-extern mStatus udsSupportAddFDToEventLoop(dnssd_sock_t fd, udsEventCallback callback, void *context, void **platform_data);
-extern int udsSupportReadFD(dnssd_sock_t fd, char* buf, int len, int flags, void *platform_data);
-extern mStatus udsSupportRemoveFDFromEventLoop(dnssd_sock_t fd, void *platform_data); // Note: This also CLOSES the file descriptor as well
-
-extern void RecordUpdatedNiceLabel(mDNS *const m, mDNSs32 delay);
-
-// Globals and functions defined in uds_daemon.c and also shared with the old "daemon.c" on OS X
-
-extern mDNS mDNSStorage;
-extern DNameListElem *AutoRegistrationDomains;
-extern DNameListElem *AutoBrowseDomains;
-
-extern mDNSs32 ChopSubTypes(char *regtype);
-extern AuthRecord *AllocateSubTypes(mDNSs32 NumSubTypes, char *p);
-extern int CountExistingRegistrations(domainname *srv, mDNSIPPort port);
-extern void FreeExtraRR(mDNS *const m, AuthRecord *const rr, mStatus result);
-extern int CountPeerRegistrations(mDNS *const m, ServiceRecordSet *const srs);
-
-#if APPLE_OSX_mDNSResponder
-extern void machserver_automatic_browse_domain_changed(const domainname *d, mDNSBool add);
-extern void machserver_automatic_registration_domain_changed(const domainname *d, mDNSBool add);
-// External support
-extern void mDNSInitPacketFilter(void);
-extern void external_start_browsing_for_service(mDNS *const m, const domainname *const type, DNS_TypeValues qtype);
-extern void external_stop_browsing_for_service(mDNS *const m, const domainname *const type, DNS_TypeValues qtype);
-extern void external_start_advertising_service(const ResourceRecord *const resourceRecord);
-extern void external_stop_advertising_service(const ResourceRecord *const resourceRecord);
-extern void external_start_resolving_service(const domainname *const fqdn);
-extern void external_stop_resolving_service(const domainname *const fqdn);
-#else
-#define external_start_browsing_for_service(A,B,C) (void)(A)
-#define external_stop_browsing_for_service(A,B,C) (void)(A)
-#define external_start_advertising_service(A) (void)(A)
-#define external_stop_advertising_service(A) (void)(A)
-#define external_start_resolving_service(A) (void)(A)
-#define external_stop_resolving_service(A) (void)(A)
-#endif // APPLE_OSX_mDNSResponder
-
-extern const char mDNSResponderVersionString_SCCS[];
-#define mDNSResponderVersionString (mDNSResponderVersionString_SCCS+5)
diff --git a/src/tools/tools.pro b/src/tools/tools.pro
index bd5bac6c8f0..0ee0f87ebf1 100644
--- a/src/tools/tools.pro
+++ b/src/tools/tools.pro
@@ -18,10 +18,6 @@ win32 {
SUBDIRS += valgrindfake
}
-linux-* {
- SUBDIRS += mdnssd
-}
-
QT_BREAKPAD_ROOT_PATH = $$(QT_BREAKPAD_ROOT_PATH)
!isEmpty(QT_BREAKPAD_ROOT_PATH) {
SUBDIRS += qtcrashhandler
--
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