/* * Copright (c) 2002-2003 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ Change History (most recent first): $Log: CFSocket.c,v $ Revision 1.157 2004/06/08 18:54:48 ksekar : mDNSResponder leaks after exploring in Printer Setup Utility Revision 1.156 2004/06/05 00:04:26 cheshire : wide-area domains should be returned in reg. domain enumeration Revision 1.155 2004/06/04 08:58:30 ksekar : Keychain integration for secure dynamic update Revision 1.154 2004/05/31 22:22:28 ksekar : wide-area domains should be returned in reg. domain enumeration Revision 1.153 2004/05/26 17:06:33 cheshire : Don't rely on CFSocketInvalidate() to remove RunLoopSource Revision 1.152 2004/05/18 23:51:26 cheshire Tidy up all checkin comments to use consistent "" format for bug numbers Revision 1.151 2004/05/17 21:46:34 cheshire : When interface is turned off, browse "remove" events are delivered with interface index zero Take care to correctly update InterfaceIDs when a dormant interface comes back to life Revision 1.150 2004/05/13 04:54:20 ksekar Unified list copy/free code. Added symetric list for Revision 1.149 2004/05/13 03:55:14 ksekar Fixed list traversal bug in FoundDefSearchDomain. Revision 1.148 2004/05/12 22:03:08 ksekar Made GetSearchDomainList a true platform-layer call (declaration moved from mDNSMacOSX.h to mDNSClientAPI.h), impelemted to return "local" only on non-OSX platforms. Changed call to return a copy of the list to avoid shared memory issues. Added a routine to free the list. Revision 1.147 2004/05/12 02:03:25 ksekar Non-local domains will only be browsed by default, and show up in _browse domain enumeration, if they contain an _browse._dns-sd ptr record. Revision 1.146 2004/04/27 02:49:15 cheshire : mDNSResponder leaks sockets on bind() error Revision 1.145 2004/04/21 03:08:03 cheshire Rename 'alias' to more descriptive name 'primary' Revision 1.144 2004/04/21 03:04:35 cheshire Minor cleanup for clarity Revision 1.143 2004/04/21 03:03:30 cheshire Preparation work: AddInterfaceToList() should return pointer to structure it creates Revision 1.142 2004/04/21 02:49:11 cheshire To reduce future confusion, renamed 'TxAndRx' to 'McastTxRx' Revision 1.141 2004/04/21 02:20:47 cheshire Rename interface field 'CurrentlyActive' to more descriptive 'Exists' Revision 1.140 2004/04/14 23:09:29 ksekar Support for TSIG signed dynamic updates. Revision 1.139 2004/04/09 17:40:26 cheshire Remove unnecessary "Multicast" field -- it duplicates the semantics of the existing McastTxRx field Revision 1.138 2004/04/09 16:37:16 cheshire Suggestion from Bob Bradley: Move NumCacheRecordsForInterfaceID() to DNSCommon.c so it's available to all platform layers Revision 1.137 2004/04/08 00:59:55 cheshire When interface turned off, browse "remove" events delivered with interface index zero Unify use of the InterfaceID field, and make code that walks the list respect the 'Exists' flag Revision 1.136 2004/04/07 01:08:57 cheshire When interface turned off, browse "remove" events delivered with interface index zero Revision 1.135 2004/03/19 01:01:03 ksekar Fixed config file parsing to chop newline Revision 1.134 2004/03/13 01:57:34 ksekar : DynDNS: Dynamic update of service records Revision 1.133 2004/02/02 22:46:56 cheshire Move "CFRelease(dict);" inside the "if (dict)" check Revision 1.132 2004/01/28 02:30:08 ksekar Added default Search Domains to unicast browsing, controlled via Networking sharing prefs pane. Stopped sending unicast messages on every interface. Fixed unicast resolving via mach-port API. Revision 1.131 2004/01/27 22:57:48 cheshire : Need separate socket for issuing unicast queries Revision 1.130 2004/01/27 22:28:40 cheshire : Time to prune obsolete code for listening on port 53 Additional lingering port 53 code deleted Revision 1.129 2004/01/27 20:15:23 cheshire : Time to prune obsolete code for listening on port 53 Revision 1.128 2004/01/24 23:58:17 cheshire Change to use mDNSVal16() instead of shifting and ORing Revision 1.127 2004/01/24 04:59:16 cheshire Fixes so that Posix/Linux, OS9, Windows, and VxWorks targets build again Revision 1.126 2004/01/23 23:23:15 ksekar Added TCP support for truncated unicast messages. Revision 1.125 2004/01/22 03:43:09 cheshire Export constants like mDNSInterface_LocalOnly so that the client layers can use them Revision 1.124 2004/01/21 21:53:19 cheshire : Don't try to receive unicast responses if we're not the first to bind to the UDP port Revision 1.123 2004/01/20 03:18:25 cheshire Removed "LogMsg("Hey There!");" that evidently got checked in my mistake Revision 1.122 2003/12/17 20:43:59 cheshire : Syslog messages saying "sendto failed" Revision 1.121 2003/12/13 03:05:28 ksekar : DynDNS: Unicast query of service records Revision 1.120 2003/12/08 21:00:46 rpantos Changes to support mDNSResponder on Linux. Revision 1.119 2003/12/03 02:35:15 cheshire Also report value of m->timenow when logging sendto() failure Revision 1.118 2003/11/14 20:59:09 cheshire Clients can't use AssignDomainName macro because mDNSPlatformMemCopy is defined in mDNSPlatformFunctions.h. Best solution is just to combine mDNSClientAPI.h and mDNSPlatformFunctions.h into a single file. Revision 1.117 2003/11/08 22:18:29 cheshire : Don't need to show process ID in *every* mDNSResponder syslog message Revision 1.116 2003/09/23 16:39:49 cheshire When LogAllOperations is set, also report registration and deregistration of interfaces Revision 1.115 2003/09/10 00:45:55 cheshire Don't log "sendto failed" errors during the first two minutes of startup Revision 1.114 2003/08/27 02:55:13 cheshire : Bug: Don't report mDNSPlatformSendUDP sendto errno 64 (Host is down) Revision 1.113 2003/08/19 22:20:00 cheshire Don't use IPv6 on interfaces that have a routable IPv4 address configured More minor refinements Revision 1.112 2003/08/19 03:04:43 cheshire Don't use IPv6 on interfaces that have a routable IPv4 address configured Revision 1.111 2003/08/18 22:53:37 cheshire mDNSResponder divide by zero in mDNSPlatformTimeNow() Revision 1.110 2003/08/16 03:39:00 cheshire InterfaceID -1 indicates "local only" Revision 1.109 2003/08/15 02:19:49 cheshire syslog messages: myCFSocketCallBack recvfrom skt 6 error -1 errno 35 Also limit number of messages to at most 100 Revision 1.108 2003/08/12 22:24:52 cheshire syslog messages: myCFSocketCallBack recvfrom skt 6 error -1 errno 35 This message indicates a kernel bug, but still we don't want to flood syslog. Do a sleep(1) after writing this log message, to limit the rate. Revision 1.107 2003/08/12 19:56:25 cheshire Update to APSL 2.0 Revision 1.106 2003/08/12 13:48:32 cheshire Add comment explaining clockdivisor calculation Revision 1.105 2003/08/12 13:44:14 cheshire mDNSResponder *VERY* unhappy if time goes backwards Use mach_absolute_time() (which is guaranteed to always go forwards, resetting only on reboot) instead of gettimeofday() (which can jump back if the user manually changes their time/date) Revision 1.104 2003/08/12 13:12:07 cheshire Textual search/replace: Indicate local functions using "mDNSlocal" instead of "static" Revision 1.103 2003/08/08 18:36:04 cheshire Only need to revalidate on interface removal on platforms that have the PhantomInterfaces bug Revision 1.102 2003/08/06 00:14:52 cheshire Need to check IP TTL on responses Also add corresponding checks in the IPv6 code path Revision 1.101 2003/08/05 22:20:16 cheshire Need to check IP TTL on responses Revision 1.100 2003/08/05 21:18:50 cheshire mDNSResponder should ignore 6to4 Only use interfaces that are marked as multicast-capable (IFF_MULTICAST) Revision 1.99 2003/08/05 20:13:52 cheshire mDNSResponder using IPv6 interfaces before they are ready Ignore interfaces with the IN6_IFF_NOTREADY flag set Revision 1.98 2003/07/20 03:38:51 ksekar Completed support for Unix-domain socket based API. Revision 1.97 2003/07/19 03:15:16 cheshire Add generic MemAllocate/MemFree prototypes to mDNSPlatformFunctions.h, and add the obvious trivial implementations to each platform support layer Revision 1.96 2003/07/18 00:30:00 cheshire Remove mDNSResponder version from packet header and use HINFO record instead Revision 1.95 2003/07/12 03:15:20 cheshire After SCDynamicStore notification, mDNSResponder updates m->hostlabel even if user hasn't actually actually changed their dot-local hostname Revision 1.94 2003/07/03 00:51:54 cheshire When select() and recvmgs() disagree, get more info from kernel about the socket state Revision 1.93 2003/07/03 00:09:14 cheshire New APIs require a mDNSPlatformInterfaceIDfromInterfaceIndex() call Additional refinement suggested by Josh: Use info->scope_id instead of if_nametoindex(info->ifa_name); Revision 1.92 2003/07/02 21:19:51 cheshire Update copyright notices, etc., in source code comments Revision 1.91 2003/06/24 01:53:51 cheshire Minor update to comments Revision 1.90 2003/06/24 01:51:47 cheshire Oops: Double-dispose of sockets Don't need to close sockets: CFSocketInvalidate() does that for us Revision 1.89 2003/06/21 18:12:47 cheshire Rendezvous cannot handle interfaces whose total name is >3 chars One-line change: should say "IF_NAMESIZE", not sizeof(ifname) Revision 1.88 2003/06/12 23:38:37 cheshire mDNSResponder doesn't detect some configuration changes Also check that scope_id matches before concluding that two interfaces are the same Revision 1.87 2003/06/10 01:14:11 cheshire New APIs require a mDNSPlatformInterfaceIDfromInterfaceIndex() call Revision 1.86 2003/05/28 02:41:52 cheshire Time to remove Mac OS 9 UDP Port 53 legacy support Revision 1.85 2003/05/28 02:39:47 cheshire Minor change to debugging messages Revision 1.84 2003/05/27 22:29:40 cheshire Remove out-dated comment Revision 1.83 2003/05/26 03:21:29 cheshire Tidy up address structure naming: mDNSIPAddr => mDNSv4Addr (for consistency with mDNSv6Addr) mDNSAddr.addr.ipv4 => mDNSAddr.ip.v4 mDNSAddr.addr.ipv6 => mDNSAddr.ip.v6 Revision 1.82 2003/05/26 03:01:27 cheshire sprintf/vsprintf-style functions are unsafe; use snprintf/vsnprintf instead Revision 1.81 2003/05/24 02:06:42 cheshire IPv6 Multicast Loopback doesn't work Tried setting IPV6_MULTICAST_LOOP; it doesn't help. However, it is probably wise to have the code explicitly set this socket option anyway, in case the default changes in later versions of Unix. Revision 1.80 2003/05/24 02:02:24 cheshire if_indextoname consumes a lot of CPU Fix error in myIfIndexToName; was returning prematurely Revision 1.79 2003/05/23 23:07:44 cheshire Must not write to stderr when running as daemon Revision 1.78 2003/05/23 01:19:04 cheshire mDNSResponder needs to signal type of service to AirPort Mark packets as high-throughput/low-delay (i.e. lowest reliability) to get maximum 802.11 multicast rate Revision 1.77 2003/05/23 01:12:05 cheshire Minor code tidying Revision 1.76 2003/05/22 01:26:01 cheshire Tidy up log messages Revision 1.75 2003/05/22 00:07:09 cheshire myCFSocketCallBack recvfrom(5) error 1, errno 35 Extra logging to determine whether there is a bug in CFSocket Revision 1.74 2003/05/21 20:20:12 cheshire Fix warnings (mainly printf format string warnings, like using "%d" where it should say "%lu", etc.) and improve error logging (use strerror() to include textual error message as well as numeric error in log messages). Revision 1.73 2003/05/21 17:56:29 ksekar : mDNSResponder doesn't watch for IPv6 address changes Revision 1.72 2003/05/14 18:48:41 cheshire mDNSResponder should be smarter about reconfigurations More minor refinements: CFSocket.c needs to do *all* its mDNS_DeregisterInterface calls before freeing memory mDNS_DeregisterInterface revalidates cache record when *any* representative of an interface goes away Revision 1.71 2003/05/14 07:08:37 cheshire mDNSResponder should be smarter about reconfigurations Previously, when there was any network configuration change, mDNSResponder would tear down the entire list of active interfaces and start again. That was very disruptive, and caused the entire cache to be flushed, and caused lots of extra network traffic. Now it only removes interfaces that have really gone, and only adds new ones that weren't there before. Revision 1.70 2003/05/07 18:30:24 cheshire Fix signed/unsigned comparison warning Revision 1.69 2003/05/06 20:14:44 cheshire Change "tp" to "tv" Revision 1.68 2003/05/06 00:00:49 cheshire Rationalize naming of domainname manipulation functions Revision 1.67 2003/04/29 00:43:44 cheshire Fix compiler warnings Revision 1.66 2003/04/26 02:41:58 cheshire Change timenow from a local variable to a structure member Revision 1.65 2003/04/26 02:34:01 cheshire Add missing mDNSexport Revision 1.64 2003/04/15 16:48:06 jgraessl Modified code in CFSocket notifier function to read all packets on the socket instead of reading only one packet every time the notifier was called. Revision 1.63 2003/04/15 16:33:50 jgraessl Switched to our own copy of if_indextoname to improve performance. Revision 1.62 2003/03/28 01:55:44 cheshire Minor improvements to debugging messages Revision 1.61 2003/03/27 03:30:56 cheshire Name conflicts not handled properly, resulting in memory corruption, and eventual crash Problem was that HostNameCallback() was calling mDNS_DeregisterInterface(), which is not safe in a callback Fixes: 1. Make mDNS_DeregisterInterface() safe to call from a callback 2. Make HostNameCallback() use mDNS_DeadvertiseInterface() instead (it never really needed to deregister the interface at all) Revision 1.60 2003/03/15 04:40:38 cheshire Change type called "mDNSOpaqueID" to the more descriptive name "mDNSInterfaceID" Revision 1.59 2003/03/11 01:23:26 cheshire mDNSResponder socket problems Revision 1.58 2003/03/06 01:43:04 cheshire Additional debugging code in mDNSResponder Improve "LIST_ALL_INTERFACES" output Revision 1.57 2003/03/05 22:36:27 cheshire Loopback doesn't work with mDNSResponder-27 Temporary workaround: Skip loopback interface *only* if we found at least one v4 interface to use Revision 1.56 2003/03/05 01:50:38 cheshire Additional debugging code in mDNSResponder Revision 1.55 2003/02/21 01:54:09 cheshire mDNSResponder needs performance improvements Switched to using new "mDNS_Execute" model (see "Implementer Notes.txt") Revision 1.54 2003/02/20 06:48:35 cheshire Xserve RAID needs to do interface-specific registrations Reviewed by: Josh Graessley, Bob Bradley Revision 1.53 2003/01/29 02:21:23 cheshire Return mStatus_Invalid if can't send packet because socket not available Revision 1.52 2003/01/28 19:39:43 jgraessl Enabling AAAA over IPv4 support. Revision 1.51 2003/01/28 05:11:23 cheshire Fixed backwards comparison in SearchForInterfaceByName Revision 1.50 2003/01/13 23:49:44 jgraessl Merged changes for the following fixes in to top of tree: computer name changes not handled properly service name changes are not properly handled announcements sent in pairs, failing chattiness test Revision 1.49 2002/12/23 22:13:30 jgraessl Reviewed by: Stuart Cheshire Initial IPv6 support for mDNSResponder. Revision 1.48 2002/11/22 01:37:52 cheshire mDNSResponder is monitoring ServiceEntities instead of InterfaceEntities Revision 1.47 2002/09/21 20:44:51 zarzycki Added APSL info Revision 1.46 2002/09/19 21:25:35 cheshire mDNS_snprintf() doesn't need to be in a separate file Revision 1.45 2002/09/17 01:45:13 cheshire Add LIST_ALL_INTERFACES symbol for debugging Revision 1.44 2002/09/17 01:36:23 cheshire Move Puma support to CFSocketPuma.c Revision 1.43 2002/09/17 01:05:28 cheshire Change mDNS_AdvertiseLocalAddresses to be an Init parameter instead of a global Revision 1.42 2002/09/16 23:13:50 cheshire Minor code tidying */ // *************************************************************************** // mDNS-CFSocket.c: // Supporting routines to run mDNS on a CFRunLoop platform // *************************************************************************** // For debugging, set LIST_ALL_INTERFACES to 1 to display all found interfaces, // including ones that mDNSResponder chooses not to use. #define LIST_ALL_INTERFACES 0 // For enabling AAAA records over IPv4. Setting this to 0 sends only // A records over IPv4 and AAAA over IPv6. Setting this to 1 sends both // AAAA and A records over both IPv4 and IPv6. #define AAAA_OVER_V4 1 #include "mDNSClientAPI.h" // Defines the interface provided to the client layer above #include "mDNSMacOSX.h" // Defines the specific types needed to run mDNS on this platform #include #include // For select() and close() #include // For va_list support #include #include #include #include #include #include #include #include #include // platform support for UTC time #include // for inet_aton #include // For IP_RECVTTL #ifndef IP_RECVTTL #define IP_RECVTTL 24 // bool; receive reception TTL w/dgram #endif #include // For n_long, required by below #include // For IPTOS_LOWDELAY etc. #include // For IN6_IFF_NOTREADY etc. #include // Code contributed by Dave Heller: // Define RUN_ON_PUMA_WITHOUT_IFADDRS to compile code that will // work on Mac OS X 10.1, which does not have the getifaddrs call. #define RUN_ON_PUMA_WITHOUT_IFADDRS 0 #if RUN_ON_PUMA_WITHOUT_IFADDRS #include "CFSocketPuma.c" #else #include #endif #include #include #include typedef struct AuthRecordListElem { struct AuthRecordListElem *next; AuthRecord ar; } AuthRecordListElem; typedef struct SearchListElem { struct SearchListElem *next; domainname domain; int flag; DNSQuestion browseQ; DNSQuestion registerQ; AuthRecordListElem *AuthRecs; } SearchListElem; // *************************************************************************** // Globals static mDNSu32 clockdivisor = 0; static mDNSBool DNSConfigInitialized = mDNSfalse; #define MAX_SEARCH_DOMAINS 32 // for domain enumeration and default browsing static SearchListElem *SearchList = NULL; // where we search for _browse domains static DNSQuestion DefBrowseDomainQ; // our local enumeration query for _browse domains static DNameListElem *DefBrowseList = NULL; // cache of answers to above query (where we search for empty string browses) #define CONFIG_FILE "/etc/mDNSResponder.conf" #define LH_KEYCHAIN_DESC "Lighthouse Shared Secret" #define LH_KEYCHAIN_SERVICE "Lighthouse" #define SYS_KEYCHAIN_PATH "/Library/Keychains/System.keychain" #define LH_SUFFIX "members.mac.com." // *************************************************************************** // Macros #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 mDNSAddressIsAllDNSLinkGroup(X) ( \ ((X)->type == mDNSAddrType_IPv4 && mDNSSameIPv4Address((X)->ip.v4, AllDNSLinkGroup )) || \ ((X)->type == mDNSAddrType_IPv6 && mDNSSameIPv6Address((X)->ip.v6, AllDNSLinkGroupv6)) ) // *************************************************************************** // Functions mDNSlocal struct ifaddrs* myGetIfAddrs(int refresh) { static struct ifaddrs *ifa = NULL; if (refresh && ifa) { freeifaddrs(ifa); ifa = NULL; } if (ifa == NULL) getifaddrs(&ifa); return ifa; } mDNSlocal int myIfIndexToName(u_short index, char* name) { struct ifaddrs *ifa; for (ifa = myGetIfAddrs(0); ifa; ifa = ifa->ifa_next) if (ifa->ifa_addr->sa_family == AF_LINK) if (((struct sockaddr_dl*)ifa->ifa_addr)->sdl_index == index) { strncpy(name, ifa->ifa_name, IF_NAMESIZE); return 0; } return -1; } mDNSexport mDNSInterfaceID mDNSPlatformInterfaceIDfromInterfaceIndex(const mDNS *const m, mDNSu32 index) { NetworkInterfaceInfoOSX *i; if (index == (uint32_t)~0) return(mDNSInterface_LocalOnly); if (index) for (i = m->p->InterfaceList; i; i = i->next) // Don't get tricked by inactive interfaces with no InterfaceID set if (i->ifinfo.InterfaceID && i->scope_id == index) return(i->ifinfo.InterfaceID); return(mDNSNULL); } mDNSexport mDNSu32 mDNSPlatformInterfaceIndexfromInterfaceID(const mDNS *const m, mDNSInterfaceID id) { NetworkInterfaceInfoOSX *i; if (id == mDNSInterface_LocalOnly) return((mDNSu32)~0); if (id) for (i = m->p->InterfaceList; i; i = i->next) // Don't use i->ifinfo.InterfaceID here, because we DO want to find inactive interfaces, which have no InterfaceID set if ((mDNSInterfaceID)i == id) return(i->scope_id); return 0; } // NOTE: If InterfaceID is NULL, it means, "send this packet through our anonymous unicast socket" // NOTE: If InterfaceID is non-NULL it means, "send this packet through our port 5353 socket on the specified interface" mDNSexport mStatus mDNSPlatformSendUDP(const mDNS *const m, const DNSMessage *const msg, const mDNSu8 *const end, mDNSInterfaceID InterfaceID, const mDNSAddr *dst, mDNSIPPort dstPort) { #pragma unused(m) // Note: For this platform we've adopted the convention that InterfaceIDs are secretly pointers // to the NetworkInterfaceInfoOSX structure that holds the active sockets. The mDNSCore code // doesn't know that and doesn't need to know that -- it just treats InterfaceIDs as opaque identifiers. NetworkInterfaceInfoOSX *info = (NetworkInterfaceInfoOSX *)InterfaceID; char *ifa_name = info ? info->ifa_name : "unicast"; struct sockaddr_storage to; int s = -1, err; if (dst->type == mDNSAddrType_IPv4) { struct sockaddr_in *sin_to = (struct sockaddr_in*)&to; sin_to->sin_len = sizeof(*sin_to); sin_to->sin_family = AF_INET; sin_to->sin_port = dstPort.NotAnInteger; sin_to->sin_addr.s_addr = dst->ip.v4.NotAnInteger; s = info ? info->ss.sktv4 : m->p->unicastsockets.sktv4; } else if (dst->type == mDNSAddrType_IPv6) { struct sockaddr_in6 *sin6_to = (struct sockaddr_in6*)&to; sin6_to->sin6_len = sizeof(*sin6_to); sin6_to->sin6_family = AF_INET6; sin6_to->sin6_port = dstPort.NotAnInteger; sin6_to->sin6_flowinfo = 0; sin6_to->sin6_addr = *(struct in6_addr*)&dst->ip.v6; sin6_to->sin6_scope_id = info ? info->scope_id : 0; s = info ? info->ss.sktv6 : m->p->unicastsockets.sktv6; } else { LogMsg("mDNSPlatformSendUDP: dst is not an IPv4 or IPv6 address!\n"); return mStatus_BadParamErr; } if (s >= 0) verbosedebugf("mDNSPlatformSendUDP: sending on InterfaceID %X %s/%d to %#a:%d skt %d", InterfaceID, ifa_name, dst->type, dst, mDNSVal16(dstPort), s); else verbosedebugf("mDNSPlatformSendUDP: NOT sending on InterfaceID %X %s/%d (socket of this type not available)", InterfaceID, ifa_name, dst->type, dst, mDNSVal16(dstPort)); // Note: When sending, mDNSCore may often ask us to send both a v4 multicast packet and then a v6 multicast packet // If we don't have the corresponding type of socket available, then return mStatus_Invalid if (s < 0) return(mStatus_Invalid); err = sendto(s, msg, (UInt8*)end - (UInt8*)msg, 0, (struct sockaddr *)&to, to.ss_len); if (err < 0) { // Don't report EHOSTDOWN (i.e. ARP failure) to unicast destinations if (errno == EHOSTDOWN && !mDNSAddressIsAllDNSLinkGroup(dst)) return(err); // Don't report EHOSTUNREACH in the first three minutes after boot // This is because mDNSResponder intentionally starts up early in the boot process (See ) // but this means that sometimes it starts before configd has finished setting up the multicast routing entries. if (errno == EHOSTUNREACH && (mDNSu32)(m->timenow) < (mDNSu32)(mDNSPlatformOneSecond * 180)) return(err); LogMsg("mDNSPlatformSendUDP sendto failed to send packet on InterfaceID %p %s/%ld to %#a:%d skt %d error %d errno %d (%s) %lu", InterfaceID, ifa_name, dst->type, dst, mDNSVal16(dstPort), s, err, errno, strerror(errno), (mDNSu32)(m->timenow)); return(err); } return(mStatus_NoError); } mDNSlocal ssize_t myrecvfrom(const int s, void *const buffer, const size_t max, struct sockaddr *const from, size_t *const fromlen, mDNSAddr *dstaddr, char ifname[IF_NAMESIZE], mDNSu8 *ttl) { static unsigned int numLogMessages = 0; struct iovec databuffers = { (char *)buffer, max }; struct msghdr msg; ssize_t n; struct cmsghdr *cmPtr; char ancillary[1024]; *ttl = 255; // If kernel fails to provide TTL data (e.g. Jaguar doesn't) then assume the TTL was 255 as it should be // Set up the message msg.msg_name = (caddr_t)from; msg.msg_namelen = *fromlen; msg.msg_iov = &databuffers; msg.msg_iovlen = 1; msg.msg_control = (caddr_t)&ancillary; msg.msg_controllen = sizeof(ancillary); msg.msg_flags = 0; // Receive the data n = recvmsg(s, &msg, 0); if (n<0) { if (errno != EWOULDBLOCK && numLogMessages++ < 100) LogMsg("CFSocket.c: recvmsg(%d) returned error %d errno %d", s, n, errno); return(-1); } if (msg.msg_controllen < (int)sizeof(struct cmsghdr)) { if (numLogMessages++ < 100) LogMsg("CFSocket.c: recvmsg(%d) msg.msg_controllen %d < sizeof(struct cmsghdr) %lu", s, msg.msg_controllen, sizeof(struct cmsghdr)); return(-1); } if (msg.msg_flags & MSG_CTRUNC) { if (numLogMessages++ < 100) LogMsg("CFSocket.c: recvmsg(%d) msg.msg_flags & MSG_CTRUNC", s); return(-1); } *fromlen = msg.msg_namelen; // Parse each option out of the ancillary data. for (cmPtr = CMSG_FIRSTHDR(&msg); cmPtr; cmPtr = CMSG_NXTHDR(&msg, cmPtr)) { // debugf("myrecvfrom cmsg_level %d cmsg_type %d", cmPtr->cmsg_level, cmPtr->cmsg_type); if (cmPtr->cmsg_level == IPPROTO_IP && cmPtr->cmsg_type == IP_RECVDSTADDR) { dstaddr->type = mDNSAddrType_IPv4; dstaddr->ip.v4.NotAnInteger = *(u_int32_t*)CMSG_DATA(cmPtr); } if (cmPtr->cmsg_level == IPPROTO_IP && cmPtr->cmsg_type == IP_RECVIF) { struct sockaddr_dl *sdl = (struct sockaddr_dl *)CMSG_DATA(cmPtr); if (sdl->sdl_nlen < IF_NAMESIZE) { mDNSPlatformMemCopy(sdl->sdl_data, ifname, sdl->sdl_nlen); ifname[sdl->sdl_nlen] = 0; // debugf("IP_RECVIF sdl_index %d, sdl_data %s len %d", sdl->sdl_index, ifname, sdl->sdl_nlen); } } if (cmPtr->cmsg_level == IPPROTO_IP && cmPtr->cmsg_type == IP_RECVTTL) { *ttl = *(u_char*)CMSG_DATA(cmPtr); } if (cmPtr->cmsg_level == IPPROTO_IPV6 && cmPtr->cmsg_type == IPV6_PKTINFO) { struct in6_pktinfo *ip6_info = (struct in6_pktinfo*)CMSG_DATA(cmPtr); dstaddr->type = mDNSAddrType_IPv6; dstaddr->ip.v6 = *(mDNSv6Addr*)&ip6_info->ipi6_addr; myIfIndexToName(ip6_info->ipi6_ifindex, ifname); } if (cmPtr->cmsg_level == IPPROTO_IPV6 && cmPtr->cmsg_type == IPV6_HOPLIMIT) { *ttl = *(int*)CMSG_DATA(cmPtr); } } return(n); } // On entry, context points to our CFSocketSet // If ss->info is NULL, we received this packet on our anonymous unicast socket // If ss->info is non-NULL, we received this packet on port 5353 on the indicated interface mDNSlocal void myCFSocketCallBack(CFSocketRef cfs, CFSocketCallBackType CallBackType, CFDataRef address, const void *data, void *context) { mDNSAddr senderAddr, destAddr; mDNSIPPort senderPort, destPort = MulticastDNSPort; const CFSocketSet *ss = (const CFSocketSet *)context; mDNS *const m = ss->m; const mDNSInterfaceID InterfaceID = ss->info ? ss->info->ifinfo.InterfaceID : mDNSNULL; DNSMessage packet; struct sockaddr_storage from; size_t fromlen = sizeof(from); char packetifname[IF_NAMESIZE] = ""; int err, s1 = -1, skt = CFSocketGetNative(cfs); int count = 0; (void)address; // Parameter not used (void)data; // Parameter not used if (CallBackType != kCFSocketReadCallBack) LogMsg("myCFSocketCallBack: Why is CallBackType %d not kCFSocketReadCallBack?", CallBackType); if (cfs == ss->cfsv4) s1 = ss->sktv4; else if (cfs == ss->cfsv6) s1 = ss->sktv6; if (s1 < 0 || s1 != skt) { LogMsg("myCFSocketCallBack: s1 %d native socket %d, cfs %p", s1, skt, cfs); LogMsg("myCFSocketCallBack: cfsv4 %p, sktv4 %d", ss->cfsv4, ss->sktv4); LogMsg("myCFSocketCallBack: cfsv6 %p, sktv6 %d", ss->cfsv6, ss->sktv6); } mDNSu8 ttl; while ((err = myrecvfrom(s1, &packet, sizeof(packet), (struct sockaddr *)&from, &fromlen, &destAddr, packetifname, &ttl)) >= 0) { count++; if (from.ss_family == AF_INET) { struct sockaddr_in *sin = (struct sockaddr_in*)&from; senderAddr.type = mDNSAddrType_IPv4; senderAddr.ip.v4.NotAnInteger = sin->sin_addr.s_addr; senderPort.NotAnInteger = sin->sin_port; } else if (from.ss_family == AF_INET6) { struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)&from; senderAddr.type = mDNSAddrType_IPv6; senderAddr.ip.v6 = *(mDNSv6Addr*)&sin6->sin6_addr; senderPort.NotAnInteger = sin6->sin6_port; } else { LogMsg("myCFSocketCallBack from is unknown address family %d", from.ss_family); return; } // Even though we indicated a specific interface in the IP_ADD_MEMBERSHIP call, a weirdness of the // sockets API means that even though this socket has only officially joined the multicast group // on one specific interface, the kernel will still deliver multicast packets to it no matter which // interface they arrive on. According to the official Unix Powers That Be, this is Not A Bug. // To work around this weirdness, we use the IP_RECVIF option to find the name of the interface // on which the packet arrived, and ignore the packet if it really arrived on some other interface. if (!ss->info) verbosedebugf("myCFSocketCallBack got a packet from %#a to %#a on unicast socket", &senderAddr, &destAddr); else if (!strcmp(ss->info->ifa_name, packetifname)) verbosedebugf("myCFSocketCallBack got a packet from %#a to %#a on interface %#a/%s", &senderAddr, &destAddr, &ss->info->ifinfo.ip, ss->info->ifa_name); else { verbosedebugf("myCFSocketCallBack got a packet from %#a to %#a on interface %#a/%s (Ignored -- really arrived on interface %s)", &senderAddr, &destAddr, &ss->info->ifinfo.ip, ss->info->ifa_name, packetifname); return; } if (err < (int)sizeof(DNSMessageHeader)) { debugf("myCFSocketCallBack packet length (%d) too short", err); return; } mDNSCoreReceive(m, &packet, (unsigned char*)&packet + err, &senderAddr, senderPort, &destAddr, destPort, InterfaceID, ttl); } if (err < 0 && (errno != EWOULDBLOCK || count == 0)) { // Something is busted here. // CFSocket says there is a packet, but myrecvfrom says there is not. // Try calling select() to get another opinion. // Find out about other socket parameter that can help understand why select() says the socket is ready for read // All of this is racy, as data may have arrived after the call to select() int save_errno = errno; int so_error = -1; int so_nread = -1; int fionread = -1; int solen = sizeof(int); fd_set readfds; FD_ZERO(&readfds); FD_SET(s1, &readfds); struct timeval timeout; timeout.tv_sec = 0; timeout.tv_usec = 0; int selectresult = select(s1+1, &readfds, NULL, NULL, &timeout); if (getsockopt(s1, SOL_SOCKET, SO_ERROR, &so_error, &solen) == -1) LogMsg("myCFSocketCallBack getsockopt(SO_ERROR) error %d", errno); if (getsockopt(s1, SOL_SOCKET, SO_NREAD, &so_nread, &solen) == -1) LogMsg("myCFSocketCallBack getsockopt(SO_NREAD) error %d", errno); if (ioctl(s1, FIONREAD, &fionread) == -1) LogMsg("myCFSocketCallBack ioctl(FIONREAD) error %d", errno); static unsigned int numLogMessages = 0; if (numLogMessages++ < 100) LogMsg("myCFSocketCallBack recvfrom skt %d error %d errno %d (%s) select %d (%spackets waiting) so_error %d so_nread %d fionread %d count %d", s1, err, save_errno, strerror(save_errno), selectresult, FD_ISSET(s1, &readfds) ? "" : "*NO* ", so_error, so_nread, fionread, count); sleep(1); // After logging this error, rate limit so we don't flood syslog } } // TCP socket support for unicast DNS and Dynamic DNS Update typedef struct { TCPConnectionCallback callback; void *context; int connected; } tcpInfo_t; mDNSlocal void tcpCFSocketCallback(CFSocketRef cfs, CFSocketCallBackType CallbackType, CFDataRef address, const void *data, void *context) { #pragma unused(CallbackType, address, data) mDNSBool connect = mDNSfalse; tcpInfo_t *info = context; if (!info->connected) { connect = mDNStrue; info->connected = mDNStrue; // prevent connected flag from being set in future callbacks } info->callback(CFSocketGetNative(cfs), info->context, connect); // NOTE: the callback may call CloseConnection here, which frees the context structure! } mDNSexport mStatus mDNSPlatformTCPConnect(const mDNSAddr *dst, mDNSOpaque16 dstport, mDNSInterfaceID InterfaceID, TCPConnectionCallback callback, void *context, int *descriptor) { int sd, on = 1; // "on" for setsockopt struct sockaddr_in saddr; CFSocketContext cfContext = { 0, NULL, 0, 0, 0 }; tcpInfo_t *info; CFSocketRef sr; CFRunLoopSourceRef rls; CFOptionFlags srFlags; (void)InterfaceID; //!!!KRS use this if non-zero!!! *descriptor = 0; if (dst->type != mDNSAddrType_IPv4) { LogMsg("ERROR: mDNSPlatformTCPConnect - attempt to connect to an IPv6 address: opperation not supported"); return mStatus_UnknownErr; } sd = socket(AF_INET, SOCK_STREAM, 0); if (sd < 0) { LogMsg("ERROR: socket; %s", strerror(errno)); return mStatus_UnknownErr; } // set non-blocking if (fcntl(sd, F_SETFL, O_NONBLOCK) < 0) { LogMsg("ERROR: setsockopt O_NONBLOCK - %s", strerror(errno)); return mStatus_UnknownErr; } // receive interface identifiers if (setsockopt(sd, IPPROTO_IP, IP_RECVIF, &on, sizeof(on)) < 0) { LogMsg("setsockopt IP_RECVIF - %s", strerror(errno)); return mStatus_UnknownErr; } // set up CF wrapper, add to Run Loop info = mallocL("mDNSPlatformTCPConnect", sizeof(tcpInfo_t)); info->callback = callback; info->context = context; cfContext.info = info; sr = CFSocketCreateWithNative(kCFAllocatorDefault, sd, kCFSocketReadCallBack | kCFSocketConnectCallBack, tcpCFSocketCallback, &cfContext); if (!sr) { LogMsg("ERROR: mDNSPlatformTCPConnect - CFSocketRefCreateWithNative failed"); freeL("mDNSPlatformTCPConnect", info); return mStatus_UnknownErr; } // prevent closing of native socket srFlags = CFSocketGetSocketFlags(sr); CFSocketSetSocketFlags(sr, srFlags & (~kCFSocketCloseOnInvalidate)); rls = CFSocketCreateRunLoopSource(kCFAllocatorDefault, sr, 0); if (!rls) { LogMsg("ERROR: mDNSPlatformTCPConnect - CFSocketCreateRunLoopSource failed"); freeL("mDNSPlatformTCPConnect", info); return mStatus_UnknownErr; } CFRunLoopAddSource(CFRunLoopGetCurrent(), rls, kCFRunLoopDefaultMode); CFRelease(rls); // initiate connection wth peer bzero(&saddr, sizeof(saddr)); saddr.sin_family = AF_INET; saddr.sin_port = dstport.NotAnInteger; memcpy(&saddr.sin_addr, &dst->ip.v4.NotAnInteger, sizeof(saddr.sin_addr)); if (connect(sd, (struct sockaddr *)&saddr, sizeof(saddr)) < 0) { if (errno == EINPROGRESS) { info->connected = 0; *descriptor= sd; return mStatus_ConnectionPending; } LogMsg("ERROR: mDNSPlatformTCPConnect - connect failed: %s", strerror(errno)); freeL("mDNSPlatformTCPConnect", info); CFSocketInvalidate(sr); return mStatus_ConnectionFailed; } info->connected = 1; *descriptor = sd; return mStatus_ConnectionEstablished; } mDNSexport void mDNSPlatformTCPCloseConnection(int sd) { CFSocketContext cfContext; tcpInfo_t *info; CFSocketRef sr; // get the CFSocket for the descriptor, if it exists sr = CFSocketCreateWithNative(kCFAllocatorDefault, sd, NULL, NULL, NULL); if (!sr) { LogMsg("ERROR: mDNSPlatformTCPCloseConnection - attempt to close a socket that was not properly created"); return; } CFSocketGetContext(sr, &cfContext); if (!cfContext.info) { LogMsg("ERROR: mDNSPlatformTCPCloseConnection - could not retreive tcpInfo from socket context"); CFRelease(sr); return; } CFRelease(sr); // this only releases the copy we allocated with CreateWithNative above info = cfContext.info; CFSocketInvalidate(sr); CFRelease(sr); close(sd); freeL("mDNSPlatformTCPCloseConnection", info); } mDNSexport int mDNSPlatformReadTCP(int sd, void *buf, int buflen) { int nread = recv(sd, buf, buflen, 0); if (nread < 0) { if (errno == EAGAIN) return 0; // no data available (call would block) LogMsg("ERROR: mDNSPlatformReadTCP - recv: %s", strerror(errno)); return -1; } return nread; } mDNSexport int mDNSPlatformWriteTCP(int sd, const char *msg, int len) { int nsent = send(sd, msg, len, 0); if (nsent < 0) { if (errno == EAGAIN) return 0; // blocked LogMsg("ERROR: mDNSPlatformWriteTCP - sendL %s", strerror(errno)); return -1; } return nsent; } // This gets the text of the field currently labelled "Computer Name" in the Sharing Prefs Control Panel mDNSlocal void GetUserSpecifiedFriendlyComputerName(domainlabel *const namelabel) { CFStringEncoding encoding = kCFStringEncodingUTF8; CFStringRef cfs = SCDynamicStoreCopyComputerName(NULL, &encoding); if (cfs) { CFStringGetPascalString(cfs, namelabel->c, sizeof(*namelabel), kCFStringEncodingUTF8); CFRelease(cfs); } } // This gets the text of the field currently labelled "Rendezvous Name" in the Sharing Prefs Control Panel mDNSlocal void GetUserSpecifiedRFC1034ComputerName(domainlabel *const namelabel) { CFStringRef cfs = SCDynamicStoreCopyLocalHostName(NULL); if (cfs) { CFStringGetPascalString(cfs, namelabel->c, sizeof(*namelabel), kCFStringEncodingUTF8); CFRelease(cfs); } } // 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 mStatus SetupSocket(CFSocketSet *cp, mDNSIPPort port, const mDNSAddr *ifaddr, u_short sa_family) { int *s = (sa_family == AF_INET) ? &cp->sktv4 : &cp->sktv6; CFSocketRef *c = (sa_family == AF_INET) ? &cp->cfsv4 : &cp->cfsv6; CFRunLoopSourceRef *r = (sa_family == AF_INET) ? &cp->rlsv4 : &cp->rlsv6; const int on = 1; const int twofivefive = 255; mStatus err = mStatus_NoError; char *errstr = mDNSNULL; if (*s >= 0) { LogMsg("SetupSocket ERROR: socket %d is already set", *s); return(-1); } if (*c) { LogMsg("SetupSocket ERROR: CFSocketRef %p is already set", *c); return(-1); } // Open the socket... int skt = socket(sa_family, SOCK_DGRAM, IPPROTO_UDP); if (skt < 0) { LogMsg("socket error %d errno %d (%s)", skt, errno, strerror(errno)); return(skt); } // ... with a shared UDP port, if it's for multicast receiving if (port.NotAnInteger) err = setsockopt(skt, SOL_SOCKET, SO_REUSEPORT, &on, sizeof(on)); if (err < 0) { errstr = "setsockopt - SO_REUSEPORT"; goto fail; } if (sa_family == AF_INET) { // We want to receive destination addresses err = setsockopt(skt, IPPROTO_IP, IP_RECVDSTADDR, &on, sizeof(on)); if (err < 0) { errstr = "setsockopt - IP_RECVDSTADDR"; goto fail; } // We want to receive interface identifiers err = setsockopt(skt, IPPROTO_IP, IP_RECVIF, &on, sizeof(on)); if (err < 0) { errstr = "setsockopt - IP_RECVIF"; goto fail; } // We want to receive packet TTL value so we can check it err = setsockopt(skt, IPPROTO_IP, IP_RECVTTL, &on, sizeof(on)); // We ignore errors here -- we already know Jaguar doesn't support this, but we can get by without it // Add multicast group membership on this interface, if it's for multicast receiving if (port.NotAnInteger) { struct in_addr addr = { ifaddr->ip.v4.NotAnInteger }; struct ip_mreq imr; imr.imr_multiaddr.s_addr = AllDNSLinkGroup.NotAnInteger; imr.imr_interface = addr; err = setsockopt(skt, IPPROTO_IP, IP_ADD_MEMBERSHIP, &imr, sizeof(imr)); if (err < 0) { errstr = "setsockopt - IP_ADD_MEMBERSHIP"; goto fail; } // Specify outgoing interface too err = setsockopt(skt, IPPROTO_IP, IP_MULTICAST_IF, &addr, sizeof(addr)); if (err < 0) { errstr = "setsockopt - IP_MULTICAST_IF"; goto fail; } } // Send unicast packets with TTL 255 err = setsockopt(skt, IPPROTO_IP, IP_TTL, &twofivefive, sizeof(twofivefive)); if (err < 0) { errstr = "setsockopt - IP_TTL"; goto fail; } // And multicast packets with TTL 255 too err = setsockopt(skt, IPPROTO_IP, IP_MULTICAST_TTL, &twofivefive, sizeof(twofivefive)); if (err < 0) { errstr = "setsockopt - IP_MULTICAST_TTL"; goto fail; } // Mark packets as high-throughput/low-delay (i.e. lowest reliability) to get maximum 802.11 multicast rate const int ip_tosbits = IPTOS_LOWDELAY | IPTOS_THROUGHPUT; err = setsockopt(skt, IPPROTO_IP, IP_TOS, &ip_tosbits, sizeof(ip_tosbits)); if (err < 0) { errstr = "setsockopt - IP_TOS"; goto fail; } // And start listening for packets struct sockaddr_in listening_sockaddr; listening_sockaddr.sin_family = AF_INET; listening_sockaddr.sin_port = port.NotAnInteger; listening_sockaddr.sin_addr.s_addr = 0; // Want to receive multicasts AND unicasts on this socket err = bind(skt, (struct sockaddr *) &listening_sockaddr, sizeof(listening_sockaddr)); if (err) { errstr = "bind"; goto fail; } } else if (sa_family == AF_INET6) { // We want to receive destination addresses and receive interface identifiers err = setsockopt(skt, IPPROTO_IPV6, IPV6_PKTINFO, &on, sizeof(on)); if (err < 0) { errstr = "setsockopt - IPV6_PKTINFO"; goto fail; } // We want to receive packet hop count value so we can check it err = setsockopt(skt, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, sizeof(on)); if (err < 0) { errstr = "setsockopt - IPV6_HOPLIMIT"; goto fail; } // We want to receive only IPv6 packets, without this option, we may // get IPv4 addresses as mapped addresses. err = setsockopt(skt, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)); if (err < 0) { errstr = "setsockopt - IPV6_V6ONLY"; goto fail; } if (port.NotAnInteger) { // Add multicast group membership on this interface, if it's for multicast receiving int interface_id = if_nametoindex(cp->info->ifa_name); struct ipv6_mreq i6mr; i6mr.ipv6mr_interface = interface_id; i6mr.ipv6mr_multiaddr = *(struct in6_addr*)&AllDNSLinkGroupv6; err = setsockopt(skt, IPPROTO_IPV6, IPV6_JOIN_GROUP, &i6mr, sizeof(i6mr)); if (err < 0) { errstr = "setsockopt - IPV6_JOIN_GROUP"; goto fail; } // Specify outgoing interface too err = setsockopt(skt, IPPROTO_IPV6, IPV6_MULTICAST_IF, &interface_id, sizeof(interface_id)); if (err < 0) { errstr = "setsockopt - IPV6_MULTICAST_IF"; goto fail; } } // Send unicast packets with TTL 255 err = setsockopt(skt, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &twofivefive, sizeof(twofivefive)); if (err < 0) { errstr = "setsockopt - IPV6_UNICAST_HOPS"; goto fail; } // And multicast packets with TTL 255 too err = setsockopt(skt, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &twofivefive, sizeof(twofivefive)); if (err < 0) { errstr = "setsockopt - IPV6_MULTICAST_HOPS"; goto fail; } // Note: IPV6_TCLASS appears not to be implemented on OS X right now (or indeed on ANY version of Unix?) #ifdef IPV6_TCLASS // Mark packets as high-throughput/low-delay (i.e. lowest reliability) to get maximum 802.11 multicast rate int tclass = IPTOS_LOWDELAY | IPTOS_THROUGHPUT; // This may not be right (since tclass is not implemented on OS X, I can't test it) err = setsockopt(skt, IPPROTO_IPV6, IPV6_TCLASS, &tclass, sizeof(tclass)); if (err < 0) { errstr = "setsockopt - IPV6_TCLASS"; goto fail; } #endif // Want to receive our own packets err = setsockopt(skt, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &on, sizeof(on)); if (err < 0) { errstr = "setsockopt - IPV6_MULTICAST_LOOP"; goto fail; } // And start listening for packets struct sockaddr_in6 listening_sockaddr6; bzero(&listening_sockaddr6, sizeof(listening_sockaddr6)); listening_sockaddr6.sin6_len = sizeof(listening_sockaddr6); listening_sockaddr6.sin6_family = AF_INET6; listening_sockaddr6.sin6_port = port.NotAnInteger; listening_sockaddr6.sin6_flowinfo = 0; // listening_sockaddr6.sin6_addr = IN6ADDR_ANY_INIT; // Want to receive multicasts AND unicasts on this socket listening_sockaddr6.sin6_scope_id = 0; err = bind(skt, (struct sockaddr *) &listening_sockaddr6, sizeof(listening_sockaddr6)); if (err) { errstr = "bind"; goto fail; } } fcntl(skt, F_SETFL, fcntl(skt, F_GETFL, 0) | O_NONBLOCK); // set non-blocking *s = skt; CFSocketContext myCFSocketContext = { 0, cp, NULL, NULL, NULL }; *c = CFSocketCreateWithNative(kCFAllocatorDefault, *s, kCFSocketReadCallBack, myCFSocketCallBack, &myCFSocketContext); *r = CFSocketCreateRunLoopSource(kCFAllocatorDefault, *c, 0); CFRunLoopAddSource(CFRunLoopGetCurrent(), *r, kCFRunLoopDefaultMode); return(err); fail: LogMsg("%s error %ld errno %d (%s)", errstr, err, errno, strerror(errno)); close(skt); return(err); } mDNSlocal mStatus SetupAddr(mDNSAddr *ip, const struct sockaddr *const sa) { if (sa->sa_family == AF_INET) { struct sockaddr_in *ifa_addr = (struct sockaddr_in *)sa; ip->type = mDNSAddrType_IPv4; ip->ip.v4.NotAnInteger = ifa_addr->sin_addr.s_addr; return(0); } else if (sa->sa_family == AF_INET6) { struct sockaddr_in6 *ifa_addr = (struct sockaddr_in6 *)sa; ip->type = mDNSAddrType_IPv6; if (IN6_IS_ADDR_LINKLOCAL(&ifa_addr->sin6_addr)) ifa_addr->sin6_addr.__u6_addr.__u6_addr16[1] = 0; ip->ip.v6 = *(mDNSv6Addr*)&ifa_addr->sin6_addr; return(0); } else { LogMsg("SetupAddr invalid sa_family %d", sa->sa_family); return(-1); } } mDNSlocal NetworkInterfaceInfoOSX *AddInterfaceToList(mDNS *const m, struct ifaddrs *ifa) { mDNSu32 scope_id = if_nametoindex(ifa->ifa_name); mDNSAddr ip; SetupAddr(&ip, ifa->ifa_addr); NetworkInterfaceInfoOSX **p; for (p = &m->p->InterfaceList; *p; p = &(*p)->next) if (scope_id == (*p)->scope_id && mDNSSameAddress(&ip, &(*p)->ifinfo.ip)) { debugf("AddInterfaceToList: Found existing interface %u with address %#a", scope_id, &ip); (*p)->Exists = mDNStrue; return(*p); } debugf("AddInterfaceToList: Making new interface %u with address %#a", scope_id, &ip); NetworkInterfaceInfoOSX *i = (NetworkInterfaceInfoOSX *)mallocL("NetworkInterfaceInfoOSX", sizeof(*i)); if (!i) return(mDNSNULL); i->ifa_name = (char *)mallocL("NetworkInterfaceInfoOSX name", strlen(ifa->ifa_name) + 1); if (!i->ifa_name) { freeL("NetworkInterfaceInfoOSX", i); return(mDNSNULL); } strcpy(i->ifa_name, ifa->ifa_name); bzero(&i->ifinfo.uDNS_info, sizeof(uDNS_NetworkInterfaceInfo)); i->ifinfo.InterfaceID = mDNSNULL; i->ifinfo.ip = ip; i->ifinfo.Advertise = m->AdvertiseLocalAddresses; i->ifinfo.McastTxRx = mDNSfalse; // For now; will be set up later at the end of UpdateInterfaceList i->next = mDNSNULL; i->Exists = mDNStrue; i->scope_id = scope_id; i->sa_family = ifa->ifa_addr->sa_family; i->Multicast = (ifa->ifa_flags & IFF_MULTICAST) && !(ifa->ifa_flags & IFF_POINTOPOINT); i->ss.m = m; i->ss.info = i; i->ss.sktv4 = i->ss.sktv6 = -1; i->ss.cfsv4 = i->ss.cfsv6 = NULL; i->ss.rlsv4 = i->ss.rlsv6 = NULL; *p = i; return(i); } mDNSlocal NetworkInterfaceInfoOSX *FindRoutableIPv4(mDNS *const m, mDNSu32 scope_id) { NetworkInterfaceInfoOSX *i; for (i = m->p->InterfaceList; i; i = i->next) if (i->Exists && i->scope_id == scope_id && i->ifinfo.ip.type == mDNSAddrType_IPv4) if (!(i->ifinfo.ip.ip.v4.b[0] == 169 && i->ifinfo.ip.ip.v4.b[1] == 254)) return(i); return(mDNSNULL); } mDNSlocal mStatus UpdateInterfaceList(mDNS *const m) { mDNSBool foundav4 = mDNSfalse; struct ifaddrs *ifa = myGetIfAddrs(1); struct ifaddrs *theLoopback = NULL; int err = (ifa != NULL) ? 0 : (errno != 0 ? errno : -1); int InfoSocket = err ? -1 : socket(AF_INET6, SOCK_DGRAM, 0); if (err) return(err); // Set up the nice label m->nicelabel.c[0] = 0; GetUserSpecifiedFriendlyComputerName(&m->nicelabel); if (m->nicelabel.c[0] == 0) MakeDomainLabelFromLiteralString(&m->nicelabel, "Macintosh"); // Set up the RFC 1034-compliant label domainlabel hostlabel; hostlabel.c[0] = 0; GetUserSpecifiedRFC1034ComputerName(&hostlabel); if (hostlabel.c[0] == 0) MakeDomainLabelFromLiteralString(&hostlabel, "Macintosh"); // If the user has changed their dot-local host name since the last time we checked, then update our local copy. // If the user has not changed their dot-local host name, then leave ours alone (m->hostlabel may have gone through // repeated conflict resolution to get to its current value, and if we reset it, we'll have to go through all that again.) if (SameDomainLabel(m->p->userhostlabel.c, hostlabel.c)) debugf("Userhostlabel (%#s) unchanged since last time; not changing m->hostlabel (%#s)", m->p->userhostlabel.c, m->hostlabel.c); else { debugf("Updating m->hostlabel to %#s", hostlabel.c); m->p->userhostlabel = m->hostlabel = hostlabel; mDNS_GenerateFQDN(m); if (mDNS_DNSRegistered(m)) mDNS_GenerateGlobalFQDN(m); } while (ifa) { #if LIST_ALL_INTERFACES if (ifa->ifa_addr->sa_family == AF_APPLETALK) debugf("UpdateInterfaceList: %4s(%d) Flags %04X Family %2d is AF_APPLETALK", ifa->ifa_name, if_nametoindex(ifa->ifa_name), ifa->ifa_flags, ifa->ifa_addr->sa_family); else if (ifa->ifa_addr->sa_family == AF_LINK) debugf("UpdateInterfaceList: %4s(%d) Flags %04X Family %2d is AF_LINK", ifa->ifa_name, if_nametoindex(ifa->ifa_name), ifa->ifa_flags, ifa->ifa_addr->sa_family); else if (ifa->ifa_addr->sa_family != AF_INET && ifa->ifa_addr->sa_family != AF_INET6) debugf("UpdateInterfaceList: %4s(%d) Flags %04X Family %2d not AF_INET (2) or AF_INET6 (30)", ifa->ifa_name, if_nametoindex(ifa->ifa_name), ifa->ifa_flags, ifa->ifa_addr->sa_family); if (!(ifa->ifa_flags & IFF_UP)) debugf("UpdateInterfaceList: %4s(%d) Flags %04X Family %2d Interface not IFF_UP", ifa->ifa_name, if_nametoindex(ifa->ifa_name), ifa->ifa_flags, ifa->ifa_addr->sa_family); if (!(ifa->ifa_flags & IFF_MULTICAST)) debugf("UpdateInterfaceList: %4s(%d) Flags %04X Family %2d Interface not IFF_MULTICAST", ifa->ifa_name, if_nametoindex(ifa->ifa_name), ifa->ifa_flags, ifa->ifa_addr->sa_family); if (ifa->ifa_flags & IFF_POINTOPOINT) debugf("UpdateInterfaceList: %4s(%d) Flags %04X Family %2d Interface IFF_POINTOPOINT", ifa->ifa_name, if_nametoindex(ifa->ifa_name), ifa->ifa_flags, ifa->ifa_addr->sa_family); if (ifa->ifa_flags & IFF_LOOPBACK) debugf("UpdateInterfaceList: %4s(%d) Flags %04X Family %2d Interface IFF_LOOPBACK", ifa->ifa_name, if_nametoindex(ifa->ifa_name), ifa->ifa_flags, ifa->ifa_addr->sa_family); #endif if (ifa->ifa_flags & IFF_UP) if (ifa->ifa_addr->sa_family == AF_INET || ifa->ifa_addr->sa_family == AF_INET6) { int ifru_flags6 = 0; if (ifa->ifa_addr->sa_family == AF_INET6 && InfoSocket >= 0) { struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; struct in6_ifreq ifr6; bzero((char *)&ifr6, sizeof(ifr6)); strncpy(ifr6.ifr_name, ifa->ifa_name, sizeof(ifr6.ifr_name)); ifr6.ifr_addr = *sin6; if (ioctl(InfoSocket, SIOCGIFAFLAG_IN6, &ifr6) != -1) ifru_flags6 = ifr6.ifr_ifru.ifru_flags6; verbosedebugf("%s %.16a %04X %04X", ifa->ifa_name, &sin6->sin6_addr, ifa->ifa_flags, ifru_flags6); } if (!(ifru_flags6 & (IN6_IFF_NOTREADY | IN6_IFF_DETACHED | IN6_IFF_DEPRECATED | IN6_IFF_TEMPORARY))) { if (ifa->ifa_flags & IFF_LOOPBACK) theLoopback = ifa; else { AddInterfaceToList(m, ifa); if (ifa->ifa_addr->sa_family == AF_INET) foundav4 = mDNStrue; } } } ifa = ifa->ifa_next; } // 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 (!foundav4 && theLoopback) AddInterfaceToList(m, theLoopback); // Now the list is complete, set the McastTxRx setting for each interface. // We always send and receive using IPv4. // To reduce traffic, we send and receive using IPv6 only on interfaces that have no routable IPv4 address. // Having a routable IPv4 address assigned is a reasonable indicator of being on a large configured network, // which means there's a good chance that most or all the other devices on that network should also have v4. // By doing this we lose the ability to talk to true v6-only devices on that link, but we cut the packet rate in half. // At this time, reducing the packet rate is more important than v6-only devices on a large configured network, // so we are willing to make that sacrifice. NetworkInterfaceInfoOSX *i; for (i = m->p->InterfaceList; i; i = i->next) if (i->Exists) { mDNSBool txrx = i->Multicast && ((i->ifinfo.ip.type == mDNSAddrType_IPv4) || !FindRoutableIPv4(m, i->scope_id)); if (i->ifinfo.McastTxRx != txrx) { i->ifinfo.McastTxRx = txrx; i->Exists = 2; // State change; need to deregister and reregister this interface } } if (InfoSocket >= 0) close(InfoSocket); return(err); } mDNSlocal NetworkInterfaceInfoOSX *SearchForInterfaceByName(mDNS *const m, char *ifname, int type) { NetworkInterfaceInfoOSX *i; for (i = m->p->InterfaceList; i; i = i->next) if (i->Exists && !strcmp(i->ifa_name, ifname) && ((AAAA_OVER_V4 ) || (type == AF_INET && i->ifinfo.ip.type == mDNSAddrType_IPv4) || (type == AF_INET6 && i->ifinfo.ip.type == mDNSAddrType_IPv6) )) return(i); return(NULL); } mDNSlocal void SetupActiveInterfaces(mDNS *const m) { NetworkInterfaceInfoOSX *i; for (i = m->p->InterfaceList; i; i = i->next) if (i->Exists) { NetworkInterfaceInfo *n = &i->ifinfo; NetworkInterfaceInfoOSX *primary = SearchForInterfaceByName(m, i->ifa_name, i->sa_family); if (!primary) LogMsg("SetupActiveInterfaces ERROR! SearchForInterfaceByName didn't find %s", i->ifa_name); if (n->InterfaceID && n->InterfaceID != (mDNSInterfaceID)primary) // Sanity check { LogMsg("SetupActiveInterfaces ERROR! n->InterfaceID %p != primary %p", n->InterfaceID, primary); n->InterfaceID = mDNSNULL; } if (!n->InterfaceID) { // NOTE: If n->InterfaceID is set, that means we've called mDNS_RegisterInterface() for this interface, // so we need to make sure we call mDNS_DeregisterInterface() before disposing it. // If n->InterfaceID is NOT set, then we haven't registered it and we should not try to deregister it n->InterfaceID = (mDNSInterfaceID)primary; mDNS_RegisterInterface(m, n); LogOperation("SetupActiveInterfaces: Registered %s(%lu) InterfaceID %p %#a%s", i->ifa_name, i->scope_id, primary, &n->ip, n->InterfaceActive ? " (Primary)" : ""); } if (!n->McastTxRx) debugf("SetupActiveInterfaces: No Tx/Rx on %s(%lu) InterfaceID %p %#a", i->ifa_name, i->scope_id, primary, &n->ip); else { if (i->sa_family == AF_INET && primary->ss.sktv4 == -1) { mStatus err = SetupSocket(&primary->ss, MulticastDNSPort, &i->ifinfo.ip, AF_INET); if (err == 0) debugf("SetupActiveInterfaces: v4 socket%2d %s(%lu) InterfaceID %p %#a", primary->ss.sktv4, i->ifa_name, i->scope_id, n->InterfaceID, &n->ip); else LogMsg("SetupActiveInterfaces: v4 socket%2d %s(%lu) InterfaceID %p %#a FAILED", primary->ss.sktv4, i->ifa_name, i->scope_id, n->InterfaceID, &n->ip); } if (i->sa_family == AF_INET6 && primary->ss.sktv6 == -1) { mStatus err = SetupSocket(&primary->ss, MulticastDNSPort, &i->ifinfo.ip, AF_INET6); if (err == 0) debugf("SetupActiveInterfaces: v6 socket%2d %s(%lu) InterfaceID %p %#a", primary->ss.sktv6, i->ifa_name, i->scope_id, n->InterfaceID, &n->ip); else LogMsg("SetupActiveInterfaces: v6 socket%2d %s(%lu) InterfaceID %p %#a FAILED", primary->ss.sktv6, i->ifa_name, i->scope_id, n->InterfaceID, &n->ip); } } } } mDNSlocal void MarkAllInterfacesInactive(mDNS *const m) { NetworkInterfaceInfoOSX *i; for (i = m->p->InterfaceList; i; i = i->next) i->Exists = mDNSfalse; } mDNSlocal void CloseSocketSet(CFSocketSet *ss) { // Note: MUST NOT close the underlying native BSD sockets. // CFSocketInvalidate() will do that for us, in its own good time, which may not necessarily be immediately, // because it first has to unhook the sockets from its select() call, before it can safely close them. if (ss->cfsv4) { CFRunLoopRemoveSource(CFRunLoopGetCurrent(), ss->rlsv4, kCFRunLoopDefaultMode); CFRelease(ss->rlsv4); CFSocketInvalidate(ss->cfsv4); CFRelease(ss->cfsv4); } if (ss->cfsv6) { CFRunLoopRemoveSource(CFRunLoopGetCurrent(), ss->rlsv6, kCFRunLoopDefaultMode); CFRelease(ss->rlsv6); CFSocketInvalidate(ss->cfsv6); CFRelease(ss->cfsv6); } ss->sktv4 = ss->sktv6 = -1; ss->cfsv4 = ss->cfsv6 = NULL; ss->rlsv4 = ss->rlsv6 = NULL; } mDNSlocal void ClearInactiveInterfaces(mDNS *const m) { // First pass: // If an interface is going away, then deregister this from the mDNSCore. // We also have to deregister it if the primary interface that it's using for its InterfaceID is going away. // We have to do this because mDNSCore will use that InterfaceID when sending packets, and if the memory // it refers to has gone away we'll crash. // Don't actually close the sockets or free the memory yet: When the last representative of an interface goes away // mDNSCore may want to send goodbye packets on that interface. (Not yet implemented, but a good idea anyway.) NetworkInterfaceInfoOSX *i; for (i = m->p->InterfaceList; i; i = i->next) { // 1. If this interface is no longer active, or its InterfaceID is changing, deregister it NetworkInterfaceInfoOSX *primary = SearchForInterfaceByName(m, i->ifa_name, i->sa_family); if (i->ifinfo.InterfaceID) if (i->Exists == 0 || i->Exists == 2 || i->ifinfo.InterfaceID != (mDNSInterfaceID)primary) { LogOperation("ClearInactiveInterfaces: Deregistering %s(%lu) InterfaceID %p %#a%s", i->ifa_name, i->scope_id, i->ifinfo.InterfaceID, &i->ifinfo.ip, i->ifinfo.InterfaceActive ? " (Primary)" : ""); mDNS_DeregisterInterface(m, &i->ifinfo); i->ifinfo.InterfaceID = mDNSNULL; // NOTE: If n->InterfaceID is set, that means we've called mDNS_RegisterInterface() for this interface, // so we need to make sure we call mDNS_DeregisterInterface() before disposing it. // If n->InterfaceID is NOT set, then it's not registered and we should not call mDNS_DeregisterInterface() on it. } } // Second pass: // Now that everything that's going to deregister has done so, we can close sockets and free the memory NetworkInterfaceInfoOSX **p = &m->p->InterfaceList; while (*p) { i = *p; // 2. Close all our CFSockets. We'll recreate them later as necessary. // (We may have previously had both v4 and v6, and we may not need both any more.) CloseSocketSet(&i->ss); // 3. If no longer active, delete interface from list and free memory if (!i->Exists && NumCacheRecordsForInterfaceID(m, (mDNSInterfaceID)i) == 0) { debugf("ClearInactiveInterfaces: Deleting %#a", &i->ifinfo.ip); *p = i->next; if (i->ifa_name) freeL("NetworkInterfaceInfoOSX name", i->ifa_name); freeL("NetworkInterfaceInfoOSX", i); } else p = &i->next; } } mDNSlocal mStatus RegisterNameServers(mDNS *const m, CFDictionaryRef dict) { int i, count; CFArrayRef values; char buf[256]; mDNSv4Addr saddr; CFStringRef s; mDNS_DeregisterDNSList(m); // deregister orig list values = CFDictionaryGetValue(dict, kSCPropNetDNSServerAddresses); if (!values) return mStatus_NoError; count = CFArrayGetCount(values); for (i = 0; i < count; i++) { s = CFArrayGetValueAtIndex(values, i); if (!s) { LogMsg("ERROR: RegisterNameServers - CFArrayGetValueAtIndex"); break; } if (!CFStringGetCString(s, buf, 256, kCFStringEncodingASCII)) { LogMsg("ERROR: RegisterNameServers - CFStringGetCString"); continue; } if (!inet_aton(buf, (struct in_addr *)saddr.b)) { LogMsg("ERROR: RegisterNameServers - invalid address string %s", buf); continue; } mDNS_RegisterDNS(m, &saddr); } return mStatus_NoError; } mDNSlocal void FreeARElemCallback(mDNS *const m, AuthRecord *const rr, mStatus result) { (void)m; // unused AuthRecordListElem *elem = rr->RecordContext; if (result == mStatus_MemFree) freeL("FreeARElemCallback", elem); } mDNSlocal void FoundDomain(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, mDNSBool AddRecord) { SearchListElem *slElem = question->QuestionContext; AuthRecordListElem *arElem, *ptr, *prev; AuthRecord *dereg; char *name; mStatus err; if (AddRecord) { arElem = mallocL("FoundDomain - arElem", sizeof(AuthRecordListElem)); if (!arElem) { LogMsg("ERROR: malloc"); return; } mDNS_SetupResourceRecord(&arElem->ar, mDNSNULL, mDNSInterface_LocalOnly, kDNSType_PTR, 7200, kDNSRecordTypeShared, FreeARElemCallback, arElem); if (question == &slElem->browseQ) name = "_browse._dns-sd._udp.local."; else name = "_register._dns-sd._udp.local."; MakeDomainNameFromDNSNameString(&arElem->ar.resrec.name, name); strcpy(arElem->ar.resrec.rdata->u.name.c, answer->rdata->u.name.c); err = mDNS_Register(m, &arElem->ar); if (err) { LogMsg("ERROR: FoundDomain - mDNS_Register returned %d", err); freeL("FoundDomain - arElem", arElem); return; } arElem->next = slElem->AuthRecs; slElem->AuthRecs = arElem; } else { ptr = slElem->AuthRecs; prev = NULL; while (ptr) { if (SameDomainName(&ptr->ar.resrec.name, &answer->name) && SameDomainName(&ptr->ar.resrec.rdata->u.name, &answer->rdata->u.name)) { debugf("Deregistering PTR %s -> %s", ptr->ar.resrec.name.c, ptr->ar.resrec.rdata->u.name.c); dereg = &ptr->ar; if (prev) prev->next = ptr->next; else slElem->AuthRecs = ptr->next; ptr = ptr->next; err = mDNS_Deregister(m, dereg); if (err) LogMsg("ERROR: FoundDomain - mDNS_Deregister returned %d", err); } else { prev = ptr; ptr = ptr->next; } } } } mDNSlocal mStatus RegisterSearchDomains(mDNS *const m, CFDictionaryRef dict) { int i, count; CFArrayRef values; domainname domain; char buf[MAX_ESCAPED_DOMAIN_NAME]; CFStringRef s; SearchListElem *new, *ptr, *prev, *freeSLPtr; AuthRecordListElem *arList; mStatus err; // step 1: mark each elem for removal (-1) for (ptr = SearchList; ptr; ptr = ptr->next) ptr->flag = -1; values = CFDictionaryGetValue(dict, kSCPropNetDNSSearchDomains); if (values) { count = CFArrayGetCount(values); for (i = 0; i < count; i++) { s = CFArrayGetValueAtIndex(values, i); if (!s) { LogMsg("ERROR: RegisterNameServers - CFArrayGetValueAtIndex"); break; } if (!CFStringGetCString(s, buf, MAX_ESCAPED_DOMAIN_NAME, kCFStringEncodingASCII)) { LogMsg("ERROR: RegisterNameServers - CFStringGetCString"); continue; } if (!MakeDomainNameFromDNSNameString(&domain, buf)) { LogMsg("ERROR: RegisterNameServers - invalid search domain %s", buf); continue; } // if domain is in list, mark as pre-existent (0) for (ptr = SearchList; ptr; ptr = ptr->next) if (SameDomainName(&ptr->domain, &domain)) { ptr->flag = 0; break; } // if domain not in list, add to list, mark as add (1) if (!ptr) { new = mallocL("RegisterSearchDomains - SearchListElem", sizeof(SearchListElem)); if (!new) { LogMsg("ERROR: RegisterSearchDomains - malloc"); return mStatus_UnknownErr; } bzero(new, sizeof(SearchListElem)); strcpy(new->domain.c, domain.c); new->flag = 1; // add new->next = SearchList; SearchList = new; } } } // delete elems marked for removal, do queries for elems marked add prev = NULL; ptr = SearchList; while (ptr) { if (ptr->flag == -1) // remove { mDNS_StopQuery(m, &ptr->browseQ); mDNS_StopQuery(m, &ptr->registerQ); // deregister records generated from answers to the query arList = ptr->AuthRecs; ptr->AuthRecs = NULL; while (arList) { AuthRecord *dereg = &arList->ar; arList = arList->next; debugf("Deregistering PTR %s -> %s", dereg->resrec.name.c, dereg->resrec.rdata->u.name.c); err = mDNS_Deregister(m, dereg); if (err) LogMsg("ERROR: RegisterSearchDomains mDNS_Deregister returned %d", err); } // remove elem from list, delete if (prev) prev->next = ptr->next; else SearchList = ptr->next; freeSLPtr = ptr; ptr = ptr->next; freeL("RegisterNameServers - freeSLPtr", freeSLPtr); continue; } if (ptr->flag == 1) // add { err = mDNS_GetDomains(m, &ptr->browseQ, mDNS_DomainTypeBrowse, &ptr->domain, mDNSInterface_Any, FoundDomain, ptr); if (err) LogMsg("ERROR: RegisterNameServers - mDNS_DomainTypeBrowse, %d", err); err = mDNS_GetDomains(m, &ptr->registerQ, mDNS_DomainTypeRegistration, &ptr->domain, mDNSInterface_Any, FoundDomain, ptr); if (err) LogMsg("ERROR: RegisterNameServers - mDNS_DomainTypeRegistration, %d", err); ptr->flag = 0; } if (ptr->flag) { LogMsg("RegisterNameServers - unknown flag %d. Skipping.", ptr->flag); } prev = ptr; ptr = ptr->next; } return mStatus_NoError; } // key must be kSCPropNetDNSServerAddresses or kSCPropNetDNSSearchDomains mDNSlocal mStatus RegisterDNSConfig(mDNS *const m, CFDictionaryRef dict, const CFStringRef key) { if (key == kSCPropNetDNSSearchDomains) return RegisterSearchDomains(m, dict); if (key == kSCPropNetDNSServerAddresses) return RegisterNameServers(m, dict); LogMsg("ERROR: RegisterDNSConfig - bad key"); return mStatus_UnknownErr; } mDNSlocal void DNSConfigChanged(SCDynamicStoreRef session, CFArrayRef changes, void *context) { mDNS *m = context; CFDictionaryRef dict; CFStringRef key; if (DNSConfigInitialized && (!changes || CFArrayGetCount(changes) == 0)) return; //!!!KRS fixme - we need a list of registerd servers. this wholesale // dereg doesn't work if there's an error and we bail out before registering the new list key = SCDynamicStoreKeyCreateNetworkGlobalEntity(NULL, kSCDynamicStoreDomainState, kSCEntNetDNS); if (!key) { LogMsg("ERROR: DNSConfigChanged - SCDynamicStoreKeyCreateNetworkGlobalEntity"); return; } dict = SCDynamicStoreCopyValue(session, key); CFRelease(key); if (dict) { RegisterDNSConfig(m, dict, kSCPropNetDNSServerAddresses); RegisterDNSConfig(m, dict, kSCPropNetDNSSearchDomains); CFRelease(dict); } if (mDNS_DNSRegistered(m)) mDNS_GenerateGlobalFQDN(m); // no-op if label & domain are unchanged } mDNSlocal mStatus WatchForDNSChanges(mDNS *const m) { CFStringRef key; CFMutableArrayRef keyList; CFRunLoopSourceRef rls; SCDynamicStoreRef session; SCDynamicStoreContext context = { 0, m, NULL, NULL, NULL }; session = SCDynamicStoreCreate(NULL, CFSTR("trackDNS"), DNSConfigChanged, &context); if (!session) { LogMsg("ERROR: WatchForDNSChanges - SCDynamicStoreCreate"); return mStatus_UnknownErr; } keyList = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks); if (!keyList) { LogMsg("ERROR: WatchForDNSChanges - CFArrayCreateMutable"); return mStatus_UnknownErr; } // create a pattern that matches the global DNS dictionary key key = SCDynamicStoreKeyCreateNetworkGlobalEntity(NULL, kSCDynamicStoreDomainState, kSCEntNetDNS); if (!key) { LogMsg("ERROR: WatchForDNSChanges - SCDynamicStoreKeyCreateNetworkGlobalEntity"); return mStatus_UnknownErr; } CFArrayAppendValue(keyList, key); CFRelease(key); // set the keys for our DynamicStore session SCDynamicStoreSetNotificationKeys(session, keyList, NULL); CFRelease(keyList); // create a CFRunLoopSource for our DynamicStore session rls = SCDynamicStoreCreateRunLoopSource(NULL, session, 0); if (!rls) { LogMsg("ERROR: WatchForDNSChanges - SCDynamicStoreCreateRunLoopSource"); return mStatus_UnknownErr; } // add the run loop source to our current run loop CFRunLoopAddSource(CFRunLoopGetCurrent(), rls, kCFRunLoopDefaultMode); CFRelease(rls); // get initial configuration DNSConfigChanged(session, NULL, m); return mStatus_NoError; } mDNSlocal void NetworkChanged(SCDynamicStoreRef store, CFArrayRef changedKeys, void *context) { (void)store; // Parameter not used (void)changedKeys; // Parameter not used debugf("*** Network Configuration Change ***"); mDNS *const m = (mDNS *const)context; MarkAllInterfacesInactive(m); UpdateInterfaceList(m); ClearInactiveInterfaces(m); SetupActiveInterfaces(m); if (m->MainCallback) m->MainCallback(m, mStatus_ConfigChanged); } mDNSlocal mStatus WatchForNetworkChanges(mDNS *const m) { mStatus err = -1; SCDynamicStoreContext context = { 0, m, NULL, NULL, NULL }; SCDynamicStoreRef store = SCDynamicStoreCreate(NULL, CFSTR("mDNSResponder"), NetworkChanged, &context); CFStringRef key1 = SCDynamicStoreKeyCreateNetworkGlobalEntity(NULL, kSCDynamicStoreDomainState, kSCEntNetIPv4); CFStringRef key2 = SCDynamicStoreKeyCreateNetworkGlobalEntity(NULL, kSCDynamicStoreDomainState, kSCEntNetIPv6); CFStringRef key3 = SCDynamicStoreKeyCreateComputerName(NULL); CFStringRef key4 = SCDynamicStoreKeyCreateHostNames(NULL); CFStringRef pattern1 = SCDynamicStoreKeyCreateNetworkInterfaceEntity(NULL, kSCDynamicStoreDomainState, kSCCompAnyRegex, kSCEntNetIPv4); CFStringRef pattern2 = SCDynamicStoreKeyCreateNetworkInterfaceEntity(NULL, kSCDynamicStoreDomainState, kSCCompAnyRegex, kSCEntNetIPv6); CFMutableArrayRef keys = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks); CFMutableArrayRef patterns = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks); if (!store) { LogMsg("SCDynamicStoreCreate failed: %s\n", SCErrorString(SCError())); goto error; } if (!key1 || !key2 || !key3 || !key4 || !keys || !pattern1 || !pattern2 || !patterns) goto error; CFArrayAppendValue(keys, key1); CFArrayAppendValue(keys, key2); CFArrayAppendValue(keys, key3); CFArrayAppendValue(keys, key4); CFArrayAppendValue(patterns, pattern1); CFArrayAppendValue(patterns, pattern2); if (!SCDynamicStoreSetNotificationKeys(store, keys, patterns)) { LogMsg("SCDynamicStoreSetNotificationKeys failed: %s\n", SCErrorString(SCError())); goto error; } m->p->StoreRLS = SCDynamicStoreCreateRunLoopSource(NULL, store, 0); if (!m->p->StoreRLS) { LogMsg("SCDynamicStoreCreateRunLoopSource failed: %s\n", SCErrorString(SCError())); goto error; } CFRunLoopAddSource(CFRunLoopGetCurrent(), m->p->StoreRLS, kCFRunLoopDefaultMode); m->p->Store = store; err = 0; goto exit; error: if (store) CFRelease(store); exit: if (key1) CFRelease(key1); if (key2) CFRelease(key2); if (key3) CFRelease(key3); if (key4) CFRelease(key4); if (pattern1) CFRelease(pattern1); if (pattern2) CFRelease(pattern2); if (keys) CFRelease(keys); if (patterns) CFRelease(patterns); return(err); } mDNSlocal void PowerChanged(void *refcon, io_service_t service, natural_t messageType, void *messageArgument) { mDNS *const m = (mDNS *const)refcon; (void)service; // Parameter not used switch(messageType) { case kIOMessageCanSystemPowerOff: debugf("PowerChanged kIOMessageCanSystemPowerOff (no action)"); break; // E0000240 case kIOMessageSystemWillPowerOff: debugf("PowerChanged kIOMessageSystemWillPowerOff"); mDNSCoreMachineSleep(m, true); break; // E0000250 case kIOMessageSystemWillNotPowerOff: debugf("PowerChanged kIOMessageSystemWillNotPowerOff (no action)"); break; // E0000260 case kIOMessageCanSystemSleep: debugf("PowerChanged kIOMessageCanSystemSleep (no action)"); break; // E0000270 case kIOMessageSystemWillSleep: debugf("PowerChanged kIOMessageSystemWillSleep"); mDNSCoreMachineSleep(m, true); break; // E0000280 case kIOMessageSystemWillNotSleep: debugf("PowerChanged kIOMessageSystemWillNotSleep (no action)"); break; // E0000290 case kIOMessageSystemHasPoweredOn: debugf("PowerChanged kIOMessageSystemHasPoweredOn"); mDNSCoreMachineSleep(m, false); break; // E0000300 default: debugf("PowerChanged unknown message %X", messageType); break; } IOAllowPowerChange(m->p->PowerConnection, (long)messageArgument); } mDNSlocal mStatus WatchForPowerChanges(mDNS *const m) { IONotificationPortRef thePortRef; m->p->PowerConnection = IORegisterForSystemPower(m, &thePortRef, PowerChanged, &m->p->PowerNotifier); if (m->p->PowerConnection) { m->p->PowerRLS = IONotificationPortGetRunLoopSource(thePortRef); CFRunLoopAddSource(CFRunLoopGetCurrent(), m->p->PowerRLS, kCFRunLoopDefaultMode); return(mStatus_NoError); } return(-1); } mDNSexport mDNSBool haveSecInfo = mDNSfalse; // this must go away once we have full keychain integration mDNSlocal void GetAuthInfoFromKeychainItem(mDNS *m, SecKeychainItemRef item) { OSStatus err; mDNSu32 infoTag = kSecAccountItemAttr; mDNSu32 infoFmt = 0; // string SecKeychainAttributeInfo info; SecKeychainAttributeList *authAttrList = NULL; void *data; mDNSu32 dataLen; mStatus regErr; char accountName[MAX_ESCAPED_DOMAIN_NAME]; domainname zone; AuthRecord *rrReg, *rrBrowse; info.count = 1; info.tag = &infoTag; info.format = &infoFmt; err = SecKeychainItemCopyAttributesAndData(item, &info, NULL, &authAttrList, &dataLen, &data); if (err) { LogMsg("SecKeychainItemCopyAttributesAndData returned error %d", err); return; } // copy account name if (!authAttrList->count || authAttrList->attr->tag != kSecAccountItemAttr) { LogMsg("Received bad authAttrList"); return; } if (authAttrList->attr->length + strlen(LH_SUFFIX) > MAX_ESCAPED_DOMAIN_NAME) { LogMsg("Account name too long (%d bytes)", authAttrList->attr->length); return; } memcpy(accountName, authAttrList->attr->data, authAttrList->attr->length); accountName[authAttrList->attr->length] = '\0'; zone.c[0] = '\0'; if (!AppendLiteralLabelString(&zone, accountName) || !AppendDNSNameString(&zone, LH_SUFFIX)) { LogMsg("InitAuthInfo - bad account name"); return; } mDNS_UpdateDomainRequiresAuthentication(m, &zone, &zone, data, dataLen, mDNStrue); if(m->uDNS_info.NameRegDomain) { debugf("Overwriting config file options with KeyChain values"); } if (!ConvertDomainNameToCString(&zone, m->uDNS_info.NameRegDomain) || !ConvertDomainNameToCString(&zone, m->uDNS_info.ServiceRegDomain)) { LogMsg("Couldn't set keychain username in uDNS global info"); } mDNS_GenerateGlobalFQDN(m); // normally we'd query the zone for _register/_browse domains, but to reduce server load we manually generate the records haveSecInfo = mDNStrue; //!!!KRS need to do better bookkeeping once we support multiple users rrReg = mallocL("AuthRecord", sizeof(AuthRecord)); rrBrowse = mallocL("AuthRecord", sizeof(AuthRecord)); if (!rrReg || !rrBrowse) { LogMsg("ERROR: Malloc"); return; } // set up _browse mDNS_SetupResourceRecord(rrBrowse, mDNSNULL, mDNSInterface_LocalOnly, kDNSType_PTR, 7200, kDNSRecordTypeShared, mDNSNULL, mDNSNULL); MakeDomainNameFromDNSNameString(&rrBrowse->resrec.name, "_browse._dns-sd._udp.local."); strcpy(rrBrowse->resrec.rdata->u.name.c, zone.c); // set up _register mDNS_SetupResourceRecord(rrReg, mDNSNULL, mDNSInterface_LocalOnly, kDNSType_PTR, 7200, kDNSRecordTypeShared, mDNSNULL, mDNSNULL); MakeDomainNameFromDNSNameString(&rrReg->resrec.name, "_register._dns-sd._udp.local."); strcpy(rrReg->resrec.rdata->u.name.c, zone.c); regErr = mDNS_Register(m, rrReg); if (regErr) LogMsg("Registration of local-only reg domain %s failed", zone.c); regErr = mDNS_Register(m, rrBrowse); if (regErr) LogMsg("Registration of local-only browse domain %s failed", zone.c); SecKeychainItemFreeContent(authAttrList, data); } mDNSlocal void InitAuthInfo(mDNS *m); mDNSlocal OSStatus KeychainCallback(SecKeychainEvent event, SecKeychainCallbackInfo *info, void *context) { (void)event; (void)info; // unused debugf("SecKeychainAddCallback received event %d", event); InitAuthInfo((mDNS *)context); // keychain events happen rarely - just rebuild the list return 0; } mDNSexport void InitAuthInfo(mDNS *m) { OSStatus err; SecKeychainSearchRef searchRef = NULL; SecKeychainRef sysKeychain = NULL; SecKeychainAttribute searchAttrs[] = { { kSecDescriptionItemAttr, strlen(LH_KEYCHAIN_DESC), LH_KEYCHAIN_DESC }, { kSecServiceItemAttr, strlen(LH_KEYCHAIN_SERVICE), LH_KEYCHAIN_SERVICE } }; SecKeychainAttributeList searchList = { sizeof(searchAttrs) / sizeof(*searchAttrs), searchAttrs }; SecKeychainItemRef item; // clear any previous entries mDNS_ClearAuthenticationList(m); err = SecKeychainOpen(SYS_KEYCHAIN_PATH, &sysKeychain); if (err) { LogMsg("ERROR: InitAuthInfo - couldn't open system keychain - %d", err); goto release_refs; } err = SecKeychainSetDomainDefault(kSecPreferencesDomainSystem, sysKeychain); if (err) { LogMsg("ERROR: InitAuthInfo - couldn't set domain default for system keychain - %d", err); goto release_refs; } err = SecKeychainSearchCreateFromAttributes(sysKeychain, kSecGenericPasswordItemClass, &searchList, &searchRef); if (err) { LogMsg("ERROR: InitAuthInfo - SecKeychainSearchCreateFromAttributes %d", err); goto release_refs; } while (!SecKeychainSearchCopyNext(searchRef, &item)) { GetAuthInfoFromKeychainItem(m, item); CFRelease(item); } err = SecKeychainAddCallback(KeychainCallback, kSecAddEventMask | kSecDeleteEventMask | kSecUpdateEventMask | kSecPasswordChangedEventMask, m); if (err && err != errSecDuplicateCallback) { LogMsg("SecKeychainAddCallback returned error %d", err); } release_refs: if (searchRef) CFRelease(searchRef); if (sysKeychain) CFRelease(sysKeychain); } CF_EXPORT CFDictionaryRef _CFCopySystemVersionDictionary(void); CF_EXPORT const CFStringRef _kCFSystemVersionProductNameKey; CF_EXPORT const CFStringRef _kCFSystemVersionProductVersionKey; CF_EXPORT const CFStringRef _kCFSystemVersionBuildVersionKey; mDNSexport mDNSBool mDNSMacOSXSystemBuildNumber(char *HINFO_SWstring) { int major = 0, minor = 0; char letter = 0, prodname[256]="Mac OS X", prodvers[256]="", buildver[256]="?"; CFDictionaryRef vers = _CFCopySystemVersionDictionary(); if (vers) { CFStringRef cfprodname = CFDictionaryGetValue(vers, _kCFSystemVersionProductNameKey); CFStringRef cfprodvers = CFDictionaryGetValue(vers, _kCFSystemVersionProductVersionKey); CFStringRef cfbuildver = CFDictionaryGetValue(vers, _kCFSystemVersionBuildVersionKey); if (cfprodname) CFStringGetCString(cfprodname, prodname, sizeof(prodname), kCFStringEncodingUTF8); if (cfprodvers) CFStringGetCString(cfprodvers, prodvers, sizeof(prodvers), kCFStringEncodingUTF8); if (cfbuildver) CFStringGetCString(cfbuildver, buildver, sizeof(buildver), kCFStringEncodingUTF8); sscanf(buildver, "%d%c%d", &major, &letter, &minor); CFRelease(vers); } if (HINFO_SWstring) mDNS_snprintf(HINFO_SWstring, 256, "%s %s (%s), %s", prodname, prodvers, buildver, mDNSResponderVersionString); return(major); } // 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_ReceiveUnicast(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); } //!!!KRS this should be less order-dependent as we support more configuration options mDNSlocal mDNSBool GetConfigOption(char *dst, const char *option, FILE *f) { char buf[1024]; int len; if (!fgets(buf, 1024, f)) { LogMsg("Option %s not set", option); return mDNSfalse; } len = strlen(option); if (!strncmp(buf, option, len)) { strcpy(dst, buf + len + 1); len = strlen(dst); if ( len && dst[len-1] == '\n') dst[len-1] = '\0'; // chop newline return mDNStrue; } LogMsg("Malformatted config file - %s not set", option); return mDNSfalse; } mDNSlocal void ReadRegDomainFromConfig(mDNS *const m) { FILE *f; uDNS_GlobalInfo *u = &m->uDNS_info;; char key[MAX_ESCAPED_DOMAIN_NAME]; domainname key_d, name_d, service_d; char secret[1024]; int slen; mStatus err; // read registration domain (for dynamic updates) from config file // !!!KRS these must go away once we can learn the reg domain from the network or prefs if (m->uDNS_info.NameRegDomain[0] || m->uDNS_info.ServiceRegDomain[0]) { debugf("Options from config already set via keychain. Ignoring config file."); return; } f = fopen(CONFIG_FILE, "r"); if (!f) { if (errno != ENOENT) LogMsg("ERROR: Config file exists, but cannot be opened."); return; } if (!GetConfigOption(u->NameRegDomain, "name-reg", f)) goto end; if (!GetConfigOption(u->ServiceRegDomain, "service-reg", f)) goto end; if (!GetConfigOption(key, "key-name", f)) goto end; if (!GetConfigOption(secret, "secret-64", f)) { LogMsg("ERROR: config file contains key without secret"); goto end; } // we don't actually need this in domain-name format - just convert it to error check if (!MakeDomainNameFromDNSNameString(&service_d, u->ServiceRegDomain)) { LogMsg("ERROR: config file contains bad service reg domain %s", u->ServiceRegDomain); u->ServiceRegDomain[0] = '\0'; } if (!MakeDomainNameFromDNSNameString(&name_d, u->NameRegDomain)) { LogMsg("ERROR: config file contains bad name reg domain %s", u->NameRegDomain); u->NameRegDomain[0] = '\0'; } if (!MakeDomainNameFromDNSNameString(&key_d, key)) { LogMsg("ERROR: config file contains bad key %s", key); key[0] = '\0'; } if (key[0]) { slen = strlen(secret); if (u->ServiceRegDomain[0]) { err = mDNS_UpdateDomainRequiresAuthentication(m, &service_d, &key_d, secret, slen, mDNStrue); if (err) LogMsg("ERROR: mDNS_UpdateDomainRequiresAuthentication returned %d for domain ", err, u->ServiceRegDomain); } if (u->NameRegDomain[0]) { err = mDNS_UpdateDomainRequiresAuthentication(m, &name_d, &key_d, secret, slen, mDNStrue); if (err) LogMsg("ERROR: mDNS_UpdateDomainRequiresAuthentication returned %d for domain ", err, u->NameRegDomain); } } end: fclose(f); } mDNSexport DNameListElem *mDNSPlatformGetSearchDomainList(void) { return mDNS_CopyDNameList(DefBrowseList); } mDNSexport DNameListElem *mDNSPlatformGetRegDomainList(void) { static DNameListElem tmp; static mDNSBool init = mDNSfalse; if (!init) { MakeDomainNameFromDNSNameString(&tmp.name, "local."); tmp.next = NULL; init = mDNStrue; } return mDNS_CopyDNameList(&tmp); } mDNSlocal void FoundDefBrowseDomain(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, mDNSBool AddRecord) { DNameListElem *ptr, *prev, *new; (void)m; // unused; (void)question; // unused if (AddRecord) { new = mallocL("FoundDefBrowseDomain", sizeof(DNameListElem)); if (!new) { LogMsg("ERROR: malloc"); return; } strcpy(new->name.c, answer->rdata->u.name.c); new->next = DefBrowseList; DefBrowseList = new; return; } else { ptr = DefBrowseList; prev = NULL; while (ptr) { if (SameDomainName(&ptr->name, &answer->rdata->u.name)) { if (prev) prev->next = ptr->next; else DefBrowseList = ptr->next; freeL("FoundDefBrowseDomain", ptr); return; } prev = ptr; ptr = ptr->next; } LogMsg("FoundDefBrowseDomain: Got remove event for domain %s not in list", answer->rdata->u.name.c); } } // Construction of Default Browse domain list (i.e. when clients pass NULL) is as follows: // 1) query for _browse._dns-sd._udp.local on LocalOnly interface // (.local manually generated via explicit callback) // 2) for each search domain (from prefs pane), query for _browse._dns-sd._udp.. // 3) for each result from (2), register LocalOnly PTR record_browse._dns-sd._udp.local. -> // 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) mDNSlocal mStatus InitDNSConfig(mDNS *const m) { mStatus err; AuthRecord local; DNSConfigInitialized = mDNStrue; // start query for domains to be used in default (empty string domain) browses err = mDNS_GetDomains(m, &DefBrowseDomainQ, mDNS_DomainTypeBrowse, NULL, mDNSInterface_LocalOnly, FoundDefBrowseDomain, NULL); // provide .local automatically mDNS_SetupResourceRecord(&local, mDNSNULL, mDNSInterface_LocalOnly, kDNSType_PTR, 7200, kDNSRecordTypeShared, mDNSNULL, mDNSNULL); MakeDomainNameFromDNSNameString(&local.resrec.name, "_browse._dns-sd._udp.local."); MakeDomainNameFromDNSNameString(&local.resrec.rdata->u.name, "local."); // other fields ignored FoundDefBrowseDomain(m, &DefBrowseDomainQ, &local.resrec, 1); return mStatus_NoError; } mDNSlocal mStatus mDNSPlatformInit_setup(mDNS *const m) { mStatus err; m->hostlabel.c[0] = 0; char *HINFO_HWstring = "Macintosh"; char HINFO_HWstring_buffer[256]; int get_model[2] = { CTL_HW, HW_MODEL }; size_t len_model = sizeof(HINFO_HWstring_buffer); if (sysctl(get_model, 2, HINFO_HWstring_buffer, &len_model, NULL, 0) == 0) HINFO_HWstring = HINFO_HWstring_buffer; char HINFO_SWstring[256] = ""; if (mDNSMacOSXSystemBuildNumber(HINFO_SWstring) < 7) m->KnownBugs |= mDNS_KnownBug_PhantomInterfaces; if (mDNSPlatformInit_ReceiveUnicast()) m->CanReceiveUnicast = mDNStrue; mDNSu32 hlen = mDNSPlatformStrLen(HINFO_HWstring); mDNSu32 slen = mDNSPlatformStrLen(HINFO_SWstring); if (hlen + slen < 254) { m->HIHardware.c[0] = hlen; m->HISoftware.c[0] = slen; mDNSPlatformMemCopy(HINFO_HWstring, &m->HIHardware.c[1], hlen); mDNSPlatformMemCopy(HINFO_SWstring, &m->HISoftware.c[1], slen); } m->p->unicastsockets.m = m; m->p->unicastsockets.info = NULL; m->p->unicastsockets.sktv4 = m->p->unicastsockets.sktv6 = -1; m->p->unicastsockets.cfsv4 = m->p->unicastsockets.cfsv6 = NULL; m->p->unicastsockets.rlsv4 = m->p->unicastsockets.rlsv6 = NULL; err = SetupSocket(&m->p->unicastsockets, zeroIPPort, &zeroAddr, AF_INET); err = SetupSocket(&m->p->unicastsockets, zeroIPPort, &zeroAddr, AF_INET6); m->p->InterfaceList = mDNSNULL; m->p->userhostlabel.c[0] = 0; UpdateInterfaceList(m); SetupActiveInterfaces(m); err = WatchForNetworkChanges(m); if (err) return(err); err = WatchForPowerChanges(m); if (err) return err; err = WatchForDNSChanges(m); InitDNSConfig(m); m->uDNS_info.ServiceRegDomain[0] = '\0'; m->uDNS_info.NameRegDomain[0] = '\0'; InitAuthInfo(m); ReadRegDomainFromConfig(m); return(err); } mDNSexport mStatus mDNSPlatformInit(mDNS *const m) { mStatus result = mDNSPlatformInit_setup(m); // We don't do asynchronous initialization on OS X, so by the time we get here the setup will already // have succeeded or failed -- so if it succeeded, we should just call mDNSCoreInitComplete() immediately if (result == mStatus_NoError) mDNSCoreInitComplete(m, mStatus_NoError); return(result); } mDNSexport void mDNSPlatformClose(mDNS *const m) { if (m->p->PowerConnection) { CFRunLoopRemoveSource(CFRunLoopGetCurrent(), m->p->PowerRLS, kCFRunLoopDefaultMode); CFRunLoopSourceInvalidate(m->p->PowerRLS); CFRelease(m->p->PowerRLS); IODeregisterForSystemPower(&m->p->PowerNotifier); m->p->PowerConnection = NULL; m->p->PowerNotifier = NULL; m->p->PowerRLS = NULL; } if (m->p->Store) { CFRunLoopRemoveSource(CFRunLoopGetCurrent(), m->p->StoreRLS, kCFRunLoopDefaultMode); CFRunLoopSourceInvalidate(m->p->StoreRLS); CFRelease(m->p->StoreRLS); CFRelease(m->p->Store); m->p->Store = NULL; m->p->StoreRLS = NULL; } MarkAllInterfacesInactive(m); ClearInactiveInterfaces(m); CloseSocketSet(&m->p->unicastsockets); } mDNSexport mDNSs32 mDNSPlatformOneSecond = 1000; mDNSexport mStatus mDNSPlatformTimeInit(mDNSs32 *timenow) { // Notes: Typical values for mach_timebase_info: // tbi.numer = 1000 million // tbi.denom = 33 million // These are set such that (mach_absolute_time() * numer/denom) gives us nanoseconds; // numer / denom = nanoseconds per hardware clock tick (e.g. 30); // denom / numer = hardware clock ticks per nanosecond (e.g. 0.033) // (denom*1000000) / numer = hardware clock ticks per millisecond (e.g. 33333) // So: mach_absolute_time() / ((denom*1000000)/numer) = milliseconds // // Arithmetic notes: // tbi.denom is at least 1, and not more than 2^32-1. // Therefore (tbi.denom * 1000000) is at least one million, but cannot overflow a uint64_t. // tbi.denom is at least 1, and not more than 2^32-1. // Therefore clockdivisor should end up being a number roughly in the range 10^3 - 10^9. // If clockdivisor is less than 10^3 then that means that the native clock frequency is less than 1MHz, // which is unlikely on any current or future Macintosh. // If clockdivisor is greater than 10^9 then that means the native clock frequency is greater than 1000GHz. // When we ship Macs with clock frequencies above 1000GHz, we may have to update this code. struct mach_timebase_info tbi; kern_return_t result = mach_timebase_info(&tbi); if (result != KERN_SUCCESS) return(result); clockdivisor = ((uint64_t)tbi.denom * 1000000) / tbi.numer; *timenow = mDNSPlatformTimeNow(); return(mStatus_NoError); } mDNSexport mDNSs32 mDNSPlatformTimeNow(void) { if (clockdivisor == 0) { LogMsg("mDNSPlatformTimeNow called before mDNSPlatformTimeInit"); return(0); } return((mDNSs32)(mach_absolute_time() / clockdivisor)); } mDNSexport mDNSs32 mDNSPlatformUTC(void) { return time(NULL); } // Locking is a no-op here, because we're single-threaded with a CFRunLoop, so we can never interrupt ourselves mDNSexport void mDNSPlatformLock (const mDNS *const m) { (void)m; } mDNSexport void mDNSPlatformUnlock (const mDNS *const m) { (void)m; } mDNSexport void mDNSPlatformStrCopy(const void *src, void *dst) { strcpy((char *)dst, (char *)src); } mDNSexport mDNSu32 mDNSPlatformStrLen (const void *src) { return(strlen((char*)src)); } mDNSexport void mDNSPlatformMemCopy(const void *src, void *dst, mDNSu32 len) { memcpy(dst, src, len); } mDNSexport mDNSBool mDNSPlatformMemSame(const void *src, const void *dst, mDNSu32 len) { return(memcmp(dst, src, len) == 0); } mDNSexport void mDNSPlatformMemZero( void *dst, mDNSu32 len) { bzero(dst, len); } mDNSexport void * mDNSPlatformMemAllocate(mDNSu32 len) { return(mallocL("mDNSPlatformMemAllocate", len)); } mDNSexport void mDNSPlatformMemFree (void *mem) { freeL("mDNSPlatformMemFree", mem); }