| /* -*- 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. |
| * |
| */ |
| |
| // We set VERSION_MIN_REQUIRED to 10.4 to avoid "bootstrap_register is deprecated" warnings from bootstrap.h |
| #define MAC_OS_X_VERSION_MIN_REQUIRED MAC_OS_X_VERSION_10_4 |
| |
| #include <mach/mach.h> |
| #include <mach/mach_error.h> |
| #include <servers/bootstrap.h> |
| #include <sys/types.h> |
| #include <errno.h> |
| #include <signal.h> |
| #include <unistd.h> |
| #include <paths.h> |
| #include <fcntl.h> |
| #include <launch.h> |
| #include <vproc.h> |
| #include <pwd.h> |
| #include <sys/event.h> |
| #include <pthread.h> |
| #include <sandbox.h> |
| #include <SystemConfiguration/SCDynamicStoreCopyDHCPInfo.h> |
| |
| #if TARGET_OS_EMBEDDED |
| #include <bootstrap_priv.h> |
| |
| #define bootstrap_register(A,B,C) bootstrap_register2((A),(B),(C),0) |
| #endif |
| |
| #include "DNSServiceDiscoveryRequestServer.h" |
| #include "DNSServiceDiscoveryReply.h" |
| |
| #include "uDNS.h" |
| #include "DNSCommon.h" |
| #include "mDNSMacOSX.h" // Defines the specific types needed to run mDNS on this platform |
| |
| #include "uds_daemon.h" // Interface to the server side implementation of dns_sd.h |
| |
| #include <DNSServiceDiscovery/DNSServiceDiscovery.h> |
| #include "helper.h" |
| |
| //************************************************************************************************************* |
| #if COMPILER_LIKES_PRAGMA_MARK |
| #pragma mark - Globals |
| #endif |
| |
| static mDNS_PlatformSupport PlatformStorage; |
| |
| // Start off with a default cache of 16K (99 records) |
| // Each time we grow the cache we add another 99 records |
| // 99 * 164 = 16236 bytes. |
| // This fits in four 4kB pages, with 148 bytes spare for memory block headers and similar overhead |
| #define RR_CACHE_SIZE ((16*1024) / sizeof(CacheRecord)) |
| static CacheEntity rrcachestorage[RR_CACHE_SIZE]; |
| |
| static const char kmDNSBootstrapName[] = "com.apple.mDNSResponderRestart"; |
| static mach_port_t m_port = MACH_PORT_NULL; |
| |
| #ifdef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| mDNSlocal void PrepareForIdle(void *m_param); |
| #else // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| static mach_port_t client_death_port = MACH_PORT_NULL; |
| static mach_port_t signal_port = MACH_PORT_NULL; |
| #endif // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| |
| static mach_port_t server_priv_port = MACH_PORT_NULL; |
| |
| static dnssd_sock_t *launchd_fds = mDNSNULL; |
| static mDNSu32 launchd_fds_count = 0; |
| |
| // mDNS Mach Message Timeout, in milliseconds. |
| // We need this to be short enough that we don't deadlock the mDNSResponder if a client |
| // fails to service its mach message queue, but long enough to give a well-written |
| // client a chance to service its mach message queue without getting cut off. |
| // Empirically, 50ms seems to work, so we set the timeout to 250ms to give |
| // even extra-slow clients a fair chance before we cut them off. |
| #define MDNS_MM_TIMEOUT 250 |
| |
| static int restarting_via_mach_init = 0; // Used on Jaguar/Panther when daemon is started via mach_init mechanism |
| static int started_via_launchdaemon = 0; // Indicates we're running on Tiger or later, where daemon is managed by launchd |
| static mDNSBool advertise = mDNS_Init_AdvertiseLocalAddresses; // By default, advertise addresses (& other records) via multicast |
| |
| extern mDNSBool StrictUnicastOrdering; |
| extern mDNSBool AlwaysAppendSearchDomains; |
| |
| //************************************************************************************************************* |
| #if COMPILER_LIKES_PRAGMA_MARK |
| #pragma mark - |
| #pragma mark - Active client list structures |
| #endif |
| |
| typedef struct DNSServiceDomainEnumeration_struct DNSServiceDomainEnumeration; |
| struct DNSServiceDomainEnumeration_struct |
| { |
| DNSServiceDomainEnumeration *next; |
| mach_port_t ClientMachPort; |
| DNSQuestion dom; // Question asking for domains |
| DNSQuestion def; // Question asking for default domain |
| }; |
| |
| typedef struct DNSServiceBrowserResult_struct DNSServiceBrowserResult; |
| struct DNSServiceBrowserResult_struct |
| { |
| DNSServiceBrowserResult *next; |
| int resultType; |
| domainname result; |
| }; |
| |
| typedef struct DNSServiceBrowser_struct DNSServiceBrowser; |
| |
| typedef struct DNSServiceBrowserQuestion |
| { |
| struct DNSServiceBrowserQuestion *next; |
| DNSQuestion q; |
| domainname domain; |
| } DNSServiceBrowserQuestion; |
| |
| struct DNSServiceBrowser_struct |
| { |
| DNSServiceBrowser *next; |
| mach_port_t ClientMachPort; |
| DNSServiceBrowserQuestion *qlist; |
| DNSServiceBrowserResult *results; |
| mDNSs32 lastsuccess; |
| mDNSBool DefaultDomain; // was the browse started on an explicit domain? |
| domainname type; // registration type |
| }; |
| |
| typedef struct DNSServiceResolver_struct DNSServiceResolver; |
| struct DNSServiceResolver_struct |
| { |
| DNSServiceResolver *next; |
| mach_port_t ClientMachPort; |
| ServiceInfoQuery q; |
| ServiceInfo i; |
| mDNSs32 ReportTime; |
| }; |
| |
| // A single registered service: ServiceRecordSet + bookkeeping |
| // Note that we duplicate some fields from parent DNSServiceRegistration object |
| // to facilitate cleanup, when instances and parent may be deallocated at different times. |
| typedef struct ServiceInstance |
| { |
| struct ServiceInstance *next; |
| mach_port_t ClientMachPort; |
| mDNSBool autoname; // Set if this name is tied to the Computer Name |
| mDNSBool renameonmemfree; // Set if we just got a name conflict and now need to automatically pick a new name |
| domainlabel name; |
| domainname domain; |
| ServiceRecordSet srs; |
| // Don't add any fields after ServiceRecordSet. |
| // This is where the implicit extra space goes if we allocate an oversized ServiceRecordSet object |
| } ServiceInstance; |
| |
| // A client-created service. May reference several ServiceInstance objects if default |
| // settings cause registration in multiple domains. |
| typedef struct DNSServiceRegistration |
| { |
| struct DNSServiceRegistration *next; |
| mach_port_t ClientMachPort; |
| mDNSBool DefaultDomain; |
| mDNSBool autoname; |
| size_t rdsize; |
| int NumSubTypes; |
| char regtype[MAX_ESCAPED_DOMAIN_NAME]; // for use in AllocateSubtypes |
| domainlabel name; // used only if autoname is false |
| domainname type; |
| mDNSIPPort port; |
| unsigned char txtinfo[1024]; |
| size_t txt_len; |
| uint32_t NextRef; |
| ServiceInstance *regs; |
| } DNSServiceRegistration; |
| |
| static DNSServiceDomainEnumeration *DNSServiceDomainEnumerationList = NULL; |
| static DNSServiceBrowser *DNSServiceBrowserList = NULL; |
| static DNSServiceResolver *DNSServiceResolverList = NULL; |
| static DNSServiceRegistration *DNSServiceRegistrationList = NULL; |
| |
| // We keep a list of client-supplied event sources in KQSocketEventSource records |
| typedef struct KQSocketEventSource |
| { |
| struct KQSocketEventSource *next; |
| int fd; |
| KQueueEntry kqs; |
| } KQSocketEventSource; |
| |
| static KQSocketEventSource *gEventSources; |
| |
| //************************************************************************************************************* |
| #if COMPILER_LIKES_PRAGMA_MARK |
| #pragma mark - |
| #pragma mark - General Utility Functions |
| #endif |
| |
| #if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING |
| |
| char _malloc_options[] = "AXZ"; |
| |
| mDNSexport void LogMemCorruption(const char *format, ...) |
| { |
| char buffer[512]; |
| va_list ptr; |
| va_start(ptr,format); |
| buffer[mDNS_vsnprintf((char *)buffer, sizeof(buffer), format, ptr)] = 0; |
| va_end(ptr); |
| LogMsg("!!!! %s !!!!", buffer); |
| NotifyOfElusiveBug("Memory Corruption", buffer); |
| #if ForceAlerts |
| *(long*)0 = 0; // Trick to crash and get a stack trace right here, if that's what we want |
| #endif |
| } |
| |
| mDNSlocal void validatelists(mDNS *const m) |
| { |
| // Check local lists |
| KQSocketEventSource *k; |
| for (k = gEventSources; k; k=k->next) |
| if (k->next == (KQSocketEventSource *)~0 || k->fd < 0) |
| LogMemCorruption("gEventSources: %p is garbage (%d)", k, k->fd); |
| |
| // Check Mach client lists |
| DNSServiceDomainEnumeration *e; |
| for (e = DNSServiceDomainEnumerationList; e; e=e->next) |
| if (e->next == (DNSServiceDomainEnumeration *)~0 || e->ClientMachPort == 0 || e->ClientMachPort == (mach_port_t) ~0) |
| LogMemCorruption("DNSServiceDomainEnumerationList: %p is garbage (%X)", e, e->ClientMachPort); |
| |
| DNSServiceBrowser *b; |
| for (b = DNSServiceBrowserList; b; b=b->next) |
| if (b->next == (DNSServiceBrowser *)~0 || b->ClientMachPort == 0 || b->ClientMachPort == (mach_port_t) ~0) |
| LogMemCorruption("DNSServiceBrowserList: %p is garbage (%X)", b, b->ClientMachPort); |
| |
| DNSServiceResolver *l; |
| for (l = DNSServiceResolverList; l; l=l->next) |
| if (l->next == (DNSServiceResolver *)~0 || l->ClientMachPort == 0 || l->ClientMachPort == (mach_port_t) ~0) |
| LogMemCorruption("DNSServiceResolverList: %p is garbage (%X)", l, l->ClientMachPort); |
| |
| DNSServiceRegistration *r; |
| for (r = DNSServiceRegistrationList; r; r=r->next) |
| if (r->next == (DNSServiceRegistration *)~0 || r->ClientMachPort == 0 || r->ClientMachPort == (mach_port_t) ~0) |
| LogMemCorruption("DNSServiceRegistrationList: %p is garbage (%X)", r, r->ClientMachPort); |
| |
| // Check Unix Domain Socket client lists (uds_daemon.c) |
| uds_validatelists(); |
| |
| // Check core mDNS lists |
| AuthRecord *rr; |
| for (rr = m->ResourceRecords; rr; rr=rr->next) |
| { |
| if (rr->next == (AuthRecord *)~0 || rr->resrec.RecordType == 0 || rr->resrec.RecordType == 0xFF) |
| LogMemCorruption("ResourceRecords list: %p is garbage (%X)", rr, rr->resrec.RecordType); |
| if (rr->resrec.name != &rr->namestorage) |
| LogMemCorruption("ResourceRecords list: %p name %p does not point to namestorage %p %##s", |
| rr, rr->resrec.name->c, rr->namestorage.c, rr->namestorage.c); |
| } |
| |
| for (rr = m->DuplicateRecords; rr; rr=rr->next) |
| if (rr->next == (AuthRecord *)~0 || rr->resrec.RecordType == 0 || rr->resrec.RecordType == 0xFF) |
| LogMemCorruption("DuplicateRecords list: %p is garbage (%X)", rr, rr->resrec.RecordType); |
| |
| rr = m->NewLocalRecords; |
| if (rr) |
| if (rr->next == (AuthRecord *)~0 || rr->resrec.RecordType == 0 || rr->resrec.RecordType == 0xFF) |
| LogMemCorruption("NewLocalRecords: %p is garbage (%X)", rr, rr->resrec.RecordType); |
| |
| rr = m->CurrentRecord; |
| if (rr) |
| if (rr->next == (AuthRecord *)~0 || rr->resrec.RecordType == 0 || rr->resrec.RecordType == 0xFF) |
| LogMemCorruption("CurrentRecord: %p is garbage (%X)", rr, rr->resrec.RecordType); |
| |
| DNSQuestion *q; |
| for (q = m->Questions; q; q=q->next) |
| if (q->next == (DNSQuestion*)~0 || q->ThisQInterval == (mDNSs32) ~0) |
| LogMemCorruption("Questions list: %p is garbage (%lX %p)", q, q->ThisQInterval, q->next); |
| |
| CacheGroup *cg; |
| CacheRecord *cr; |
| mDNSu32 slot; |
| FORALL_CACHERECORDS(slot, cg, cr) |
| { |
| if (cr->resrec.RecordType == 0 || cr->resrec.RecordType == 0xFF) |
| LogMemCorruption("Cache slot %lu: %p is garbage (%X)", slot, cr, cr->resrec.RecordType); |
| if (cr->CRActiveQuestion) |
| { |
| for (q = m->Questions; q; q=q->next) if (q == cr->CRActiveQuestion) break; |
| if (!q) LogMemCorruption("Cache slot %lu: CRActiveQuestion %p not in m->Questions list %s", slot, cr->CRActiveQuestion, CRDisplayString(m, cr)); |
| } |
| } |
| |
| // Check core uDNS lists |
| udns_validatelists(m); |
| |
| // Check platform-layer lists |
| NetworkInterfaceInfoOSX *i; |
| for (i = m->p->InterfaceList; i; i = i->next) |
| if (i->next == (NetworkInterfaceInfoOSX *)~0 || !i->m || i->m == (mDNS *)~0) |
| LogMemCorruption("m->p->InterfaceList: %p is garbage (%p)", i, i->ifinfo.ifname); |
| |
| ClientTunnel *t; |
| for (t = m->TunnelClients; t; t=t->next) |
| if (t->next == (ClientTunnel *)~0 || t->dstname.c[0] > 63) |
| LogMemCorruption("m->TunnelClients: %p is garbage (%d)", t, t->dstname.c[0]); |
| } |
| |
| mDNSexport void *mallocL(char *msg, unsigned int size) |
| { |
| // Allocate space for two words of sanity checking data before the requested block |
| mDNSu32 *mem = malloc(sizeof(mDNSu32) * 2 + size); |
| if (!mem) |
| { LogMsg("malloc( %s : %d ) failed", msg, size); return(NULL); } |
| else |
| { |
| if (size > 24000) LogMsg("malloc( %s : %lu ) = %p suspiciously large", msg, size, &mem[2]); |
| else if (MACOSX_MDNS_MALLOC_DEBUGGING >= 2) LogMsg("malloc( %s : %lu ) = %p", msg, size, &mem[2]); |
| mem[0] = 0xDEAD1234; |
| mem[1] = size; |
| //mDNSPlatformMemZero(&mem[2], size); |
| memset(&mem[2], 0xFF, size); |
| validatelists(&mDNSStorage); |
| return(&mem[2]); |
| } |
| } |
| |
| mDNSexport void freeL(char *msg, void *x) |
| { |
| if (!x) |
| LogMsg("free( %s @ NULL )!", msg); |
| else |
| { |
| mDNSu32 *mem = ((mDNSu32 *)x) - 2; |
| if (mem[0] != 0xDEAD1234) { LogMsg("free( %s @ %p ) !!!! NOT ALLOCATED !!!!", msg, &mem[2]); return; } |
| if (mem[1] > 24000) LogMsg("free( %s : %ld @ %p) suspiciously large", msg, mem[1], &mem[2]); |
| else if (MACOSX_MDNS_MALLOC_DEBUGGING >= 2) LogMsg("free( %s : %ld @ %p)", msg, mem[1], &mem[2]); |
| //mDNSPlatformMemZero(mem, sizeof(mDNSu32) * 2 + mem[1]); |
| memset(mem, 0xFF, sizeof(mDNSu32) * 2 + mem[1]); |
| validatelists(&mDNSStorage); |
| free(mem); |
| } |
| } |
| |
| #endif |
| |
| //************************************************************************************************************* |
| #if COMPILER_LIKES_PRAGMA_MARK |
| #pragma mark - |
| #pragma mark - Mach client request handlers |
| #endif |
| |
| //************************************************************************************************************* |
| // Client Death Detection |
| |
| // This gets called after ALL constituent records of the Service Record Set have been deregistered |
| mDNSlocal void FreeServiceInstance(ServiceInstance *x) |
| { |
| ServiceRecordSet *s = &x->srs; |
| ExtraResourceRecord *e = x->srs.Extras, *tmp; |
| |
| while (e) |
| { |
| e->r.RecordContext = e; |
| tmp = e; |
| e = e->next; |
| FreeExtraRR(&mDNSStorage, &tmp->r, mStatus_MemFree); |
| } |
| |
| if (s->RR_TXT.resrec.rdata != &s->RR_TXT.rdatastorage) |
| freeL("TXT RData", s->RR_TXT.resrec.rdata); |
| |
| if (s->SubTypes) freeL("ServiceSubTypes", s->SubTypes); |
| freeL("ServiceInstance", x); |
| } |
| |
| // AbortClient finds whatever client is identified by the given Mach port, |
| // stops whatever operation that client was doing, and frees its memory. |
| // In the case of a service registration, the actual freeing may be deferred |
| // until we get the mStatus_MemFree message, if necessary |
| mDNSlocal void AbortClient(mach_port_t ClientMachPort, void *m) |
| { |
| DNSServiceDomainEnumeration **e = &DNSServiceDomainEnumerationList; |
| DNSServiceBrowser **b = &DNSServiceBrowserList; |
| DNSServiceResolver **l = &DNSServiceResolverList; |
| DNSServiceRegistration **r = &DNSServiceRegistrationList; |
| |
| while (*e && (*e)->ClientMachPort != ClientMachPort) e = &(*e)->next; |
| if (*e) |
| { |
| DNSServiceDomainEnumeration *x = *e; |
| *e = (*e)->next; |
| if (m && m != x) |
| LogMsg("%5d: DNSServiceDomainEnumeration(%##s) STOP; WARNING m %p != x %p", ClientMachPort, x->dom.qname.c, m, x); |
| else LogOperation("%5d: DNSServiceDomainEnumeration(%##s) STOP", ClientMachPort, x->dom.qname.c); |
| mDNS_StopGetDomains(&mDNSStorage, &x->dom); |
| mDNS_StopGetDomains(&mDNSStorage, &x->def); |
| freeL("DNSServiceDomainEnumeration", x); |
| return; |
| } |
| |
| while (*b && (*b)->ClientMachPort != ClientMachPort) b = &(*b)->next; |
| if (*b) |
| { |
| DNSServiceBrowser *x = *b; |
| DNSServiceBrowserQuestion *freePtr, *qptr = x->qlist; |
| *b = (*b)->next; |
| while (qptr) |
| { |
| if (m && m != x) |
| LogMsg("%5d: DNSServiceBrowse(%##s) STOP; WARNING m %p != x %p", ClientMachPort, qptr->q.qname.c, m, x); |
| else LogOperation("%5d: DNSServiceBrowse(%##s) STOP", ClientMachPort, qptr->q.qname.c); |
| mDNS_StopBrowse(&mDNSStorage, &qptr->q); |
| freePtr = qptr; |
| qptr = qptr->next; |
| freeL("DNSServiceBrowserQuestion", freePtr); |
| } |
| while (x->results) |
| { |
| DNSServiceBrowserResult *t = x->results; |
| x->results = x->results->next; |
| freeL("DNSServiceBrowserResult", t); |
| } |
| freeL("DNSServiceBrowser", x); |
| return; |
| } |
| |
| while (*l && (*l)->ClientMachPort != ClientMachPort) l = &(*l)->next; |
| if (*l) |
| { |
| DNSServiceResolver *x = *l; |
| *l = (*l)->next; |
| if (m && m != x) |
| LogMsg("%5d: DNSServiceResolve(%##s) STOP; WARNING m %p != x %p", ClientMachPort, x->i.name.c, m, x); |
| else LogOperation("%5d: DNSServiceResolve(%##s) STOP", ClientMachPort, x->i.name.c); |
| mDNS_StopResolveService(&mDNSStorage, &x->q); |
| freeL("DNSServiceResolver", x); |
| return; |
| } |
| |
| while (*r && (*r)->ClientMachPort != ClientMachPort) r = &(*r)->next; |
| if (*r) |
| { |
| ServiceInstance *si = NULL; |
| DNSServiceRegistration *x = *r; |
| *r = (*r)->next; |
| |
| si = x->regs; |
| while (si) |
| { |
| ServiceInstance *instance = si; |
| si = si->next; |
| instance->renameonmemfree = mDNSfalse; |
| if (m && m != x) LogMsg("%5d: DNSServiceRegistration(%##s, %u) STOP; WARNING m %p != x %p", ClientMachPort, instance->srs.RR_SRV.resrec.name->c, SRS_PORT(&instance->srs), m, x); |
| else LogOperation("%5d: DNSServiceRegistration(%##s, %u) STOP", ClientMachPort, instance->srs.RR_SRV.resrec.name->c, SRS_PORT(&instance->srs)); |
| |
| // If mDNS_DeregisterService() returns mStatus_NoError, that means that the service was found in the list, |
| // is sending its goodbye packet, and we'll get an mStatus_MemFree message when we can free the memory. |
| // If mDNS_DeregisterService() returns an error, it means that the service had already been removed from |
| // the list, so we should go ahead and free the memory right now |
| if (mDNS_DeregisterService(&mDNSStorage, &instance->srs)) FreeServiceInstance(instance); // FreeServiceInstance invalidates pointer |
| } |
| x->regs = NULL; |
| freeL("DNSServiceRegistration", x); |
| return; |
| } |
| |
| LogMsg("%5d: died or deallocated, but no record of client can be found!", ClientMachPort); |
| } |
| |
| #define AbortBlockedClient(C,MSG,M) AbortClientWithLogMessage((C), "stopped accepting Mach messages", " (" MSG ")", (M)) |
| |
| mDNSlocal void AbortClientWithLogMessage(mach_port_t c, char *reason, char *msg, void *m) |
| { |
| DNSServiceDomainEnumeration *e = DNSServiceDomainEnumerationList; |
| DNSServiceBrowser *b = DNSServiceBrowserList; |
| DNSServiceResolver *l = DNSServiceResolverList; |
| DNSServiceRegistration *r = DNSServiceRegistrationList; |
| DNSServiceBrowserQuestion *qptr; |
| |
| while (e && e->ClientMachPort != c) e = e->next; |
| while (b && b->ClientMachPort != c) b = b->next; |
| while (l && l->ClientMachPort != c) l = l->next; |
| while (r && r->ClientMachPort != c) r = r->next; |
| |
| if (e) LogMsg("%5d: DomainEnumeration(%##s) %s%s", c, e->dom.qname.c, reason, msg); |
| else if (b) |
| { |
| for (qptr = b->qlist; qptr; qptr = qptr->next) |
| LogMsg("%5d: Browser(%##s) %s%s", c, qptr->q.qname.c, reason, msg); |
| } |
| else if (l) LogMsg("%5d: Resolver(%##s) %s%s", c, l->i.name.c, reason, msg); |
| else if (r) |
| { |
| ServiceInstance *si; |
| for (si = r->regs; si; si = si->next) |
| LogMsg("%5d: Registration(%##s) %s%s", c, si->srs.RR_SRV.resrec.name->c, reason, msg); |
| } |
| else LogMsg("%5d: (%s) %s, but no record of client can be found!", c, reason, msg); |
| |
| AbortClient(c, m); |
| } |
| |
| mDNSlocal mDNSBool CheckForExistingClient(mach_port_t c) |
| { |
| DNSServiceDomainEnumeration *e = DNSServiceDomainEnumerationList; |
| DNSServiceBrowser *b = DNSServiceBrowserList; |
| DNSServiceResolver *l = DNSServiceResolverList; |
| DNSServiceRegistration *r = DNSServiceRegistrationList; |
| DNSServiceBrowserQuestion *qptr; |
| |
| while (e && e->ClientMachPort != c) e = e->next; |
| while (b && b->ClientMachPort != c) b = b->next; |
| while (l && l->ClientMachPort != c) l = l->next; |
| while (r && r->ClientMachPort != c) r = r->next; |
| if (e) LogMsg("%5d: DomainEnumeration(%##s) already exists!", c, e->dom.qname.c); |
| if (b) |
| { |
| for (qptr = b->qlist; qptr; qptr = qptr->next) |
| LogMsg("%5d: Browser(%##s) already exists!", c, qptr->q.qname.c); |
| } |
| if (l) LogMsg("%5d: Resolver(%##s) already exists!", c, l->i.name.c); |
| if (r) LogMsg("%5d: Registration(%##s) already exists!", c, r->regs ? r->regs->srs.RR_SRV.resrec.name->c : NULL); |
| return(e || b || l || r); |
| } |
| |
| #ifndef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| |
| mDNSlocal void ClientDeathCallback(CFMachPortRef unusedport, void *voidmsg, CFIndex size, void *info) |
| { |
| KQueueLock(&mDNSStorage); |
| mach_msg_header_t *msg = (mach_msg_header_t *)voidmsg; |
| (void)unusedport; // Unused |
| (void)size; // Unused |
| (void)info; // Unused |
| if (msg->msgh_id == MACH_NOTIFY_DEAD_NAME) |
| { |
| const mach_dead_name_notification_t *const deathMessage = (mach_dead_name_notification_t *)msg; |
| AbortClient(deathMessage->not_port, NULL); |
| |
| /* Deallocate the send right that came in the dead name notification */ |
| mach_port_destroy(mach_task_self(), deathMessage->not_port); |
| } |
| KQueueUnlock(&mDNSStorage, "Mach AbortClient"); |
| } |
| |
| #endif // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| |
| mDNSlocal void EnableDeathNotificationForClient(mach_port_t ClientMachPort, void *m) |
| { |
| #ifdef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| dispatch_source_t mach_source = dispatch_source_create(DISPATCH_SOURCE_TYPE_MACH_SEND, ClientMachPort, 0, dispatch_get_main_queue()); |
| if (mach_source == mDNSNULL) |
| { |
| AbortClientWithLogMessage(ClientMachPort, "died/deallocated before we could enable death notification", "", m); |
| return; |
| } |
| dispatch_source_set_event_handler(mach_source, ^{ |
| mach_port_destroy(mach_task_self(), ClientMachPort); |
| }); |
| dispatch_resume(mach_source); |
| #else // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| mach_port_t prev; |
| kern_return_t r = mach_port_request_notification(mach_task_self(), ClientMachPort, MACH_NOTIFY_DEAD_NAME, 0, |
| client_death_port, MACH_MSG_TYPE_MAKE_SEND_ONCE, &prev); |
| // If the port already died while we were thinking about it, then abort the operation right away |
| if (r != KERN_SUCCESS) |
| AbortClientWithLogMessage(ClientMachPort, "died/deallocated before we could enable death notification", "", m); |
| #endif // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| } |
| |
| //************************************************************************************************************* |
| // Domain Enumeration |
| |
| mDNSlocal void DomainEnumFound(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord) |
| { |
| kern_return_t status; |
| char buffer[MAX_ESCAPED_DOMAIN_NAME]; |
| DNSServiceDomainEnumerationReplyResultType rt; |
| DNSServiceDomainEnumeration *x = (DNSServiceDomainEnumeration *)question->QuestionContext; |
| (void)m; // Unused |
| |
| debugf("DomainEnumFound: %##s PTR %##s", answer->name->c, answer->rdata->u.name.c); |
| if (answer->rrtype != kDNSType_PTR) return; |
| if (!x) { debugf("DomainEnumFound: DNSServiceDomainEnumeration is NULL"); return; } |
| |
| if (AddRecord) |
| { |
| if (question == &x->dom) rt = DNSServiceDomainEnumerationReplyAddDomain; |
| else rt = DNSServiceDomainEnumerationReplyAddDomainDefault; |
| } |
| else |
| { |
| if (question == &x->dom) rt = DNSServiceDomainEnumerationReplyRemoveDomain; |
| else return; |
| } |
| |
| LogOperation("%5d: DNSServiceDomainEnumeration(%##s) %##s %s", |
| x->ClientMachPort, x->dom.qname.c, answer->rdata->u.name.c, |
| !AddRecord ? "RemoveDomain" : |
| question == &x->dom ? "AddDomain" : "AddDomainDefault"); |
| |
| ConvertDomainNameToCString(&answer->rdata->u.name, buffer); |
| status = DNSServiceDomainEnumerationReply_rpc(x->ClientMachPort, rt, buffer, 0, MDNS_MM_TIMEOUT); |
| if (status == MACH_SEND_TIMED_OUT) |
| AbortBlockedClient(x->ClientMachPort, "enumeration", x); |
| } |
| |
| mDNSexport kern_return_t provide_DNSServiceDomainEnumerationCreate_rpc(mach_port_t unusedserver, mach_port_t client, |
| int regDom) |
| { |
| // Check client parameter |
| (void)unusedserver; // Unused |
| mStatus err = mStatus_NoError; |
| const char *errormsg = "Unknown"; |
| if (client == (mach_port_t)-1) { err = mStatus_Invalid; errormsg = "Client id -1 invalid"; goto fail; } |
| if (CheckForExistingClient(client)) { err = mStatus_Invalid; errormsg = "Client id already in use"; goto fail; } |
| |
| mDNS_DomainType dt1 = regDom ? mDNS_DomainTypeRegistration : mDNS_DomainTypeBrowse; |
| mDNS_DomainType dt2 = regDom ? mDNS_DomainTypeRegistrationDefault : mDNS_DomainTypeBrowseDefault; |
| |
| // Allocate memory, and handle failure |
| DNSServiceDomainEnumeration *x = mallocL("DNSServiceDomainEnumeration", sizeof(*x)); |
| if (!x) { err = mStatus_NoMemoryErr; errormsg = "No memory"; goto fail; } |
| |
| // Set up object, and link into list |
| x->ClientMachPort = client; |
| x->next = DNSServiceDomainEnumerationList; |
| DNSServiceDomainEnumerationList = x; |
| |
| verbosedebugf("%5d: Enumerate %s Domains", client, regDom ? "Registration" : "Browsing"); |
| |
| // Do the operation |
| err = mDNS_GetDomains(&mDNSStorage, &x->dom, dt1, NULL, mDNSInterface_LocalOnly, DomainEnumFound, x); |
| if (!err) err = mDNS_GetDomains(&mDNSStorage, &x->def, dt2, NULL, mDNSInterface_LocalOnly, DomainEnumFound, x); |
| if (err) { AbortClient(client, x); errormsg = "mDNS_GetDomains"; goto fail; } |
| |
| // Succeeded: Wrap up and return |
| LogOperation("%5d: DNSServiceDomainEnumeration(%##s) START", client, x->dom.qname.c); |
| EnableDeathNotificationForClient(client, x); |
| return(mStatus_NoError); |
| |
| fail: |
| LogMsg("%5d: DNSServiceDomainEnumeration(%d) failed: %s (%d)", client, regDom, errormsg, err); |
| return(err); |
| } |
| |
| //************************************************************************************************************* |
| // Browse for services |
| |
| mDNSlocal void FoundInstance(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord) |
| { |
| (void)m; // Unused |
| |
| if (answer->rrtype != kDNSType_PTR) |
| { LogMsg("FoundInstance: Should not be called with rrtype %d (not a PTR record)", answer->rrtype); return; } |
| |
| domainlabel name; |
| domainname type, domain; |
| if (!DeconstructServiceName(&answer->rdata->u.name, &name, &type, &domain)) |
| { |
| LogMsg("FoundInstance: %##s PTR %##s received from network is not valid DNS-SD service pointer", |
| answer->name->c, answer->rdata->u.name.c); |
| return; |
| } |
| |
| DNSServiceBrowserResult *x = mallocL("DNSServiceBrowserResult", sizeof(*x)); |
| if (!x) { LogMsg("FoundInstance: Failed to allocate memory for result %##s", answer->rdata->u.name.c); return; } |
| |
| verbosedebugf("FoundInstance: %s %##s", AddRecord ? "Add" : "Rmv", answer->rdata->u.name.c); |
| AssignDomainName(&x->result, &answer->rdata->u.name); |
| if (AddRecord) |
| x->resultType = DNSServiceBrowserReplyAddInstance; |
| else x->resultType = DNSServiceBrowserReplyRemoveInstance; |
| x->next = NULL; |
| |
| DNSServiceBrowser *browser = (DNSServiceBrowser *)question->QuestionContext; |
| DNSServiceBrowserResult **p = &browser->results; |
| while (*p) p = &(*p)->next; |
| *p = x; |
| |
| LogOperation("%5d: DNSServiceBrowse(%##s, %s) RESULT %s %s", |
| browser->ClientMachPort, question->qname.c, DNSTypeName(question->qtype), AddRecord ? "Add" : "Rmv", RRDisplayString(m, answer)); |
| } |
| |
| mDNSlocal mStatus AddDomainToBrowser(DNSServiceBrowser *browser, const domainname *d) |
| { |
| mStatus err = mStatus_NoError; |
| DNSServiceBrowserQuestion *ptr, *question = NULL; |
| |
| for (ptr = browser->qlist; ptr; ptr = ptr->next) |
| { |
| if (SameDomainName(&ptr->q.qname, d)) |
| { debugf("Domain %##s already contained in browser", d->c); return mStatus_AlreadyRegistered; } |
| } |
| |
| question = mallocL("DNSServiceBrowserQuestion", sizeof(DNSServiceBrowserQuestion)); |
| if (!question) { LogMsg("Error: malloc"); return mStatus_NoMemoryErr; } |
| AssignDomainName(&question->domain, d); |
| question->next = browser->qlist; |
| LogOperation("%5d: DNSServiceBrowse(%##s%##s) START", browser->ClientMachPort, browser->type.c, d->c); |
| err = mDNS_StartBrowse(&mDNSStorage, &question->q, &browser->type, d, mDNSInterface_Any, 0, mDNSfalse, mDNSfalse, FoundInstance, browser); |
| if (!err) |
| browser->qlist = question; |
| else |
| { |
| LogMsg("Error: AddDomainToBrowser: mDNS_StartBrowse %d", err); |
| freeL("DNSServiceBrowserQuestion", question); |
| } |
| return err; |
| } |
| |
| mDNSexport void machserver_automatic_browse_domain_changed(const domainname *d, mDNSBool add) |
| { |
| DNSServiceBrowser *ptr; |
| for (ptr = DNSServiceBrowserList; ptr; ptr = ptr->next) |
| { |
| if (ptr->DefaultDomain) |
| { |
| if (add) |
| { |
| mStatus err = AddDomainToBrowser(ptr, d); |
| if (err && err != mStatus_AlreadyRegistered) LogMsg("Default browse in domain %##s for client %5d failed. Continuing", d, ptr->ClientMachPort); |
| } |
| else |
| { |
| DNSServiceBrowserQuestion **q = &ptr->qlist; |
| while (*q) |
| { |
| if (SameDomainName(&(*q)->domain, d)) |
| { |
| DNSServiceBrowserQuestion *rem = *q; |
| *q = (*q)->next; |
| mDNS_StopQueryWithRemoves(&mDNSStorage, &rem->q); |
| freeL("DNSServiceBrowserQuestion", rem); |
| return; |
| } |
| q = &(*q)->next; |
| } |
| LogMsg("Requested removal of default domain %##s not in client %5d's list", d->c, ptr->ClientMachPort); |
| } |
| } |
| } |
| } |
| |
| mDNSexport kern_return_t provide_DNSServiceBrowserCreate_rpc(mach_port_t unusedserver, mach_port_t client, |
| DNSCString regtype, DNSCString domain) |
| { |
| // Check client parameter |
| (void)unusedserver; // Unused |
| mStatus err = mStatus_NoError; |
| const char *errormsg = "Unknown"; |
| |
| if (client == (mach_port_t)-1) { err = mStatus_Invalid; errormsg = "Client id -1 invalid"; goto fail; } |
| if (CheckForExistingClient(client)) { err = mStatus_Invalid; errormsg = "Client id already in use"; goto fail; } |
| |
| // Check other parameters |
| domainname t, d; |
| t.c[0] = 0; |
| mDNSs32 NumSubTypes = ChopSubTypes(regtype); // Note: Modifies regtype string to remove trailing subtypes |
| if (NumSubTypes < 0 || NumSubTypes > 1) { errormsg = "Bad Service SubType"; goto badparam; } |
| if (NumSubTypes == 1 && !AppendDNSNameString(&t, regtype + strlen(regtype) + 1)) |
| { errormsg = "Bad Service SubType"; goto badparam; } |
| if (!regtype[0] || !AppendDNSNameString(&t, regtype)) { errormsg = "Illegal regtype"; goto badparam; } |
| domainname temp; |
| if (!MakeDomainNameFromDNSNameString(&temp, regtype)) { errormsg = "Illegal regtype"; goto badparam; } |
| if (temp.c[0] > 15 && (!domain || domain[0] == 0)) domain = "local."; // For over-long service types, we only allow domain "local" |
| |
| // Allocate memory, and handle failure |
| DNSServiceBrowser *x = mallocL("DNSServiceBrowser", sizeof(*x)); |
| if (!x) { err = mStatus_NoMemoryErr; errormsg = "No memory"; goto fail; } |
| |
| // Set up object, and link into list |
| AssignDomainName(&x->type, &t); |
| x->ClientMachPort = client; |
| x->results = NULL; |
| x->lastsuccess = 0; |
| x->qlist = NULL; |
| x->next = DNSServiceBrowserList; |
| DNSServiceBrowserList = x; |
| |
| if (domain[0]) |
| { |
| // Start browser for an explicit domain |
| x->DefaultDomain = mDNSfalse; |
| if (!MakeDomainNameFromDNSNameString(&d, domain)) { errormsg = "Illegal domain"; goto badparam; } |
| err = AddDomainToBrowser(x, &d); |
| if (err) { AbortClient(client, x); errormsg = "AddDomainToBrowser"; goto fail; } |
| } |
| else |
| { |
| DNameListElem *sdPtr; |
| // Start browser on all domains |
| x->DefaultDomain = mDNStrue; |
| if (!AutoBrowseDomains) { AbortClient(client, x); errormsg = "GetSearchDomainList"; goto fail; } |
| for (sdPtr = AutoBrowseDomains; sdPtr; sdPtr = sdPtr->next) |
| { |
| err = AddDomainToBrowser(x, &sdPtr->name); |
| if (err) |
| { |
| // only terminally bail if .local fails |
| if (!SameDomainName(&localdomain, &sdPtr->name)) |
| LogMsg("Default browse in domain %##s failed. Continuing", sdPtr->name.c); |
| else { AbortClient(client, x); errormsg = "AddDomainToBrowser"; goto fail; } |
| } |
| } |
| } |
| |
| // Succeeded: Wrap up and return |
| EnableDeathNotificationForClient(client, x); |
| return(mStatus_NoError); |
| |
| badparam: |
| err = mStatus_BadParamErr; |
| fail: |
| LogMsg("%5d: DNSServiceBrowse(\"%s\", \"%s\") failed: %s (%d)", client, regtype, domain, errormsg, err); |
| return(err); |
| } |
| |
| //************************************************************************************************************* |
| // Resolve Service Info |
| |
| mDNSlocal void FoundInstanceInfo(mDNS *const m, ServiceInfoQuery *query) |
| { |
| kern_return_t status; |
| DNSServiceResolver *x = (DNSServiceResolver *)query->ServiceInfoQueryContext; |
| NetworkInterfaceInfoOSX *ifx = IfindexToInterfaceInfoOSX(m, query->info->InterfaceID); |
| if (query->info->InterfaceID == mDNSInterface_LocalOnly || query->info->InterfaceID == mDNSInterface_P2P) ifx = mDNSNULL; |
| struct sockaddr_storage interface; |
| struct sockaddr_storage address; |
| char cstring[1024]; |
| int i, pstrlen = query->info->TXTinfo[0]; |
| (void)m; // Unused |
| |
| //debugf("FoundInstanceInfo %.4a %.4a %##s", &query->info->InterfaceAddr, &query->info->ip, &query->info->name); |
| |
| if (query->info->TXTlen > sizeof(cstring)) return; |
| |
| mDNSPlatformMemZero(&interface, sizeof(interface)); |
| mDNSPlatformMemZero(&address, sizeof(address)); |
| |
| if (ifx && ifx->ifinfo.ip.type == mDNSAddrType_IPv4) |
| { |
| struct sockaddr_in *s = (struct sockaddr_in*)&interface; |
| s->sin_len = sizeof(*s); |
| s->sin_family = AF_INET; |
| s->sin_port = 0; |
| s->sin_addr.s_addr = ifx->ifinfo.ip.ip.v4.NotAnInteger; |
| } |
| else if (ifx && ifx->ifinfo.ip.type == mDNSAddrType_IPv6) |
| { |
| struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)&interface; |
| sin6->sin6_len = sizeof(*sin6); |
| sin6->sin6_family = AF_INET6; |
| sin6->sin6_flowinfo = 0; |
| sin6->sin6_port = 0; |
| sin6->sin6_addr = *(struct in6_addr*)&ifx->ifinfo.ip.ip.v6; |
| sin6->sin6_scope_id = ifx->scope_id; |
| } |
| |
| if (query->info->ip.type == mDNSAddrType_IPv4) |
| { |
| struct sockaddr_in *s = (struct sockaddr_in*)&address; |
| s->sin_len = sizeof(*s); |
| s->sin_family = AF_INET; |
| s->sin_port = query->info->port.NotAnInteger; |
| s->sin_addr.s_addr = query->info->ip.ip.v4.NotAnInteger; |
| } |
| else |
| { |
| struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)&address; |
| sin6->sin6_len = sizeof(*sin6); |
| sin6->sin6_family = AF_INET6; |
| sin6->sin6_port = query->info->port.NotAnInteger; |
| sin6->sin6_flowinfo = 0; |
| sin6->sin6_addr = *(struct in6_addr*)&query->info->ip.ip.v6; |
| sin6->sin6_scope_id = ifx ? ifx->scope_id : 0; |
| } |
| |
| // The OS X DNSServiceResolverResolve() API is defined using a C-string, |
| // but the mDNS_StartResolveService() call actually returns a packed block of P-strings. |
| // Hence we have to convert the P-string(s) to a C-string before returning the result to the client. |
| // ASCII-1 characters are used in the C-string as boundary markers, |
| // to indicate the boundaries between the original constituent P-strings. |
| for (i=1; i<query->info->TXTlen; i++) |
| { |
| if (--pstrlen >= 0) |
| cstring[i-1] = query->info->TXTinfo[i]; |
| else |
| { |
| cstring[i-1] = 1; |
| pstrlen = query->info->TXTinfo[i]; |
| } |
| } |
| cstring[i-1] = 0; // Put the terminating NULL on the end |
| |
| LogOperation("%5d: DNSServiceResolver(%##s) -> %#a:%u", x->ClientMachPort, |
| x->i.name.c, &query->info->ip, mDNSVal16(query->info->port)); |
| status = DNSServiceResolverReply_rpc(x->ClientMachPort, |
| (char*)&interface, (char*)&address, cstring, 0, MDNS_MM_TIMEOUT); |
| if (status == MACH_SEND_TIMED_OUT) |
| AbortBlockedClient(x->ClientMachPort, "resolve", x); |
| } |
| |
| mDNSexport kern_return_t provide_DNSServiceResolverResolve_rpc(mach_port_t unusedserver, mach_port_t client, |
| DNSCString name, DNSCString regtype, DNSCString domain) |
| { |
| // Check client parameter |
| (void)unusedserver; // Unused |
| mStatus err = mStatus_NoError; |
| const char *errormsg = "Unknown"; |
| if (client == (mach_port_t)-1) { err = mStatus_Invalid; errormsg = "Client id -1 invalid"; goto fail; } |
| if (CheckForExistingClient(client)) { err = mStatus_Invalid; errormsg = "Client id already in use"; goto fail; } |
| |
| // Check other parameters |
| domainlabel n; |
| domainname t, d, srv; |
| if (!name[0] || !MakeDomainLabelFromLiteralString(&n, name)) { errormsg = "Bad Instance Name"; goto badparam; } |
| if (!regtype[0] || !MakeDomainNameFromDNSNameString(&t, regtype)) { errormsg = "Bad Service Type"; goto badparam; } |
| if (!domain[0] || !MakeDomainNameFromDNSNameString(&d, domain)) { errormsg = "Bad Domain"; goto badparam; } |
| if (!ConstructServiceName(&srv, &n, &t, &d)) { errormsg = "Bad Name"; goto badparam; } |
| |
| // Allocate memory, and handle failure |
| DNSServiceResolver *x = mallocL("DNSServiceResolver", sizeof(*x)); |
| if (!x) { err = mStatus_NoMemoryErr; errormsg = "No memory"; goto fail; } |
| |
| // Set up object, and link into list |
| x->ClientMachPort = client; |
| x->i.InterfaceID = mDNSInterface_Any; |
| x->i.name = srv; |
| x->ReportTime = NonZeroTime(mDNS_TimeNow(&mDNSStorage) + 130 * mDNSPlatformOneSecond); |
| x->next = DNSServiceResolverList; |
| DNSServiceResolverList = x; |
| |
| // Do the operation |
| LogOperation("%5d: DNSServiceResolve(%##s) START", client, x->i.name.c); |
| err = mDNS_StartResolveService(&mDNSStorage, &x->q, &x->i, FoundInstanceInfo, x); |
| if (err) { AbortClient(client, x); errormsg = "mDNS_StartResolveService"; goto fail; } |
| |
| // Succeeded: Wrap up and return |
| EnableDeathNotificationForClient(client, x); |
| return(mStatus_NoError); |
| |
| badparam: |
| err = mStatus_BadParamErr; |
| fail: |
| LogMsg("%5d: DNSServiceResolve(\"%s\", \"%s\", \"%s\") failed: %s (%d)", client, name, regtype, domain, errormsg, err); |
| return(err); |
| } |
| |
| //************************************************************************************************************* |
| // Registration |
| |
| mDNSexport void RecordUpdatedNiceLabel(mDNS *const m, mDNSs32 delay) |
| { |
| m->p->NotifyUser = NonZeroTime(m->timenow + delay); |
| } |
| |
| mDNSlocal void RegCallback(mDNS *const m, ServiceRecordSet *const srs, mStatus result) |
| { |
| ServiceInstance *si = (ServiceInstance*)srs->ServiceContext; |
| |
| if (result == mStatus_NoError) |
| { |
| kern_return_t status; |
| LogOperation("%5d: DNSServiceRegistration(%##s, %u) Name Registered", si->ClientMachPort, srs->RR_SRV.resrec.name->c, SRS_PORT(srs)); |
| status = DNSServiceRegistrationReply_rpc(si->ClientMachPort, result, MDNS_MM_TIMEOUT); |
| if (status == MACH_SEND_TIMED_OUT) |
| AbortBlockedClient(si->ClientMachPort, "registration success", si); |
| if (si->autoname && CountPeerRegistrations(m, srs) == 0) |
| RecordUpdatedNiceLabel(m, 0); // Successfully got new name, tell user immediately |
| } |
| |
| else if (result == mStatus_NameConflict) |
| { |
| LogOperation("%5d: DNSServiceRegistration(%##s, %u) Name Conflict", si->ClientMachPort, srs->RR_SRV.resrec.name->c, SRS_PORT(srs)); |
| // Note: By the time we get the mStatus_NameConflict message, the service is already deregistered |
| // and the memory is free, so we don't have to wait for an mStatus_MemFree message as well. |
| if (si->autoname && CountPeerRegistrations(m, srs) == 0) |
| { |
| // On conflict for an autoname service, rename and reregister *all* autoname services |
| IncrementLabelSuffix(&m->nicelabel, mDNStrue); |
| mDNS_ConfigChanged(m); |
| } |
| else if (si->autoname) |
| { |
| mDNS_RenameAndReregisterService(m, srs, mDNSNULL); |
| return; |
| } |
| else |
| { |
| // If we get a name conflict, we tell the client about it, and then they are expected to dispose |
| // of their registration in the usual way (which we will catch via client death notification). |
| // If the Mach queue is full, we forcibly abort the client immediately. |
| kern_return_t status = DNSServiceRegistrationReply_rpc(si->ClientMachPort, result, MDNS_MM_TIMEOUT); |
| if (status == MACH_SEND_TIMED_OUT) |
| AbortBlockedClient(si->ClientMachPort, "registration conflict", NULL); |
| } |
| } |
| |
| else if (result == mStatus_MemFree) |
| { |
| if (si->renameonmemfree) // We intentionally terminated registration so we could re-register with new name |
| { |
| debugf("RegCallback renaming %#s to %#s", si->name.c, m->nicelabel.c); |
| si->renameonmemfree = mDNSfalse; |
| si->name = m->nicelabel; |
| mDNS_RenameAndReregisterService(m, srs, &si->name); |
| } |
| else |
| { |
| // SANITY CHECK: make sure service instance is no longer in any ServiceRegistration's list |
| DNSServiceRegistration *r; |
| for (r = DNSServiceRegistrationList; r; r = r->next) |
| { |
| ServiceInstance **sp = &r->regs; |
| while (*sp) |
| { |
| if (*sp == si) { LogMsg("RegCallback: %##s Still in list; removing", srs->RR_SRV.resrec.name->c); *sp = (*sp)->next; break; } |
| sp = &(*sp)->next; |
| } |
| } |
| // END SANITY CHECK |
| FreeServiceInstance(si); |
| } |
| } |
| |
| else if (result != mStatus_NATTraversal) |
| LogMsg("%5d: DNSServiceRegistration(%##s, %u) Unknown Result %d", si->ClientMachPort, srs->RR_SRV.resrec.name->c, SRS_PORT(srs), result); |
| } |
| |
| mDNSlocal mStatus AddServiceInstance(DNSServiceRegistration *x, const domainname *domain) |
| { |
| mStatus err = 0; |
| ServiceInstance *si = NULL; |
| AuthRecord *SubTypes = NULL; |
| |
| for (si = x->regs; si; si = si->next) |
| { |
| if (SameDomainName(&si->domain, domain)) |
| { LogMsg("Requested addition of domain %##s already in list", domain->c); return mStatus_AlreadyRegistered; } |
| } |
| |
| SubTypes = AllocateSubTypes(x->NumSubTypes, x->regtype); |
| if (x->NumSubTypes && !SubTypes) return mStatus_NoMemoryErr; |
| |
| si = mallocL("ServiceInstance", sizeof(*si) - sizeof(RDataBody) + x->rdsize); |
| if (!si) return mStatus_NoMemoryErr; |
| |
| si->ClientMachPort = x->ClientMachPort; |
| si->renameonmemfree = mDNSfalse; |
| si->autoname = x->autoname; |
| si->name = x->autoname ? mDNSStorage.nicelabel : x->name; |
| si->domain = *domain; |
| |
| err = mDNS_RegisterService(&mDNSStorage, &si->srs, &si->name, &x->type, domain, NULL, |
| x->port, x->txtinfo, x->txt_len, SubTypes, x->NumSubTypes, mDNSInterface_Any, RegCallback, si, 0); |
| if (!err) |
| { |
| si->next = x->regs; |
| x->regs = si; |
| } |
| else |
| { |
| LogMsg("Error %d for registration of service in domain %##s", err, domain->c); |
| freeL("ServiceInstance", si); |
| } |
| return err; |
| } |
| |
| mDNSexport void machserver_automatic_registration_domain_changed(const domainname *d, mDNSBool add) |
| { |
| DNSServiceRegistration *reg; |
| |
| for (reg = DNSServiceRegistrationList; reg; reg = reg->next) |
| { |
| if (reg->DefaultDomain) |
| { |
| if (add) |
| AddServiceInstance(reg, d); |
| else |
| { |
| ServiceInstance **si = ®->regs; |
| while (*si) |
| { |
| if (SameDomainName(&(*si)->domain, d)) |
| { |
| ServiceInstance *s = *si; |
| *si = (*si)->next; |
| if (mDNS_DeregisterService(&mDNSStorage, &s->srs)) FreeServiceInstance(s); // only free memory synchronously on error |
| break; |
| } |
| si = &(*si)->next; |
| } |
| if (!si) debugf("Requested removal of default domain %##s not in client %5d's list", d, reg->ClientMachPort); // normal if registration failed |
| } |
| } |
| } |
| } |
| |
| mDNSexport kern_return_t provide_DNSServiceRegistrationCreate_rpc(mach_port_t unusedserver, mach_port_t client, |
| DNSCString name, DNSCString regtype, DNSCString domain, IPPort IpPort, DNSCString txtRecord) |
| { |
| (void)unusedserver; // Unused |
| mStatus err = mStatus_NoError; |
| const char *errormsg = "Unknown"; |
| |
| // older versions of this code passed the port via mach IPC as an int. |
| // we continue to pass it as 4 bytes to maintain binary compatibility, |
| // but now ensure that the network byte order is preserved by using a struct |
| mDNSIPPort port; |
| port.b[0] = IpPort.bytes[2]; |
| port.b[1] = IpPort.bytes[3]; |
| |
| if (client == (mach_port_t)-1) { err = mStatus_Invalid; errormsg = "Client id -1 invalid"; goto fail; } |
| if (CheckForExistingClient(client)) { err = mStatus_Invalid; errormsg = "Client id already in use"; goto fail; } |
| |
| // Check for sub-types after the service type |
| size_t reglen = strlen(regtype) + 1; |
| if (reglen > MAX_ESCAPED_DOMAIN_NAME) { errormsg = "reglen too long"; goto badparam; } |
| mDNSs32 NumSubTypes = ChopSubTypes(regtype); // Note: Modifies regtype string to remove trailing subtypes |
| if (NumSubTypes < 0) { errormsg = "Bad Service SubType"; goto badparam; } |
| |
| // Check other parameters |
| domainlabel n; |
| domainname t, d; |
| domainname srv; |
| if (!name[0]) n = mDNSStorage.nicelabel; |
| else if (!MakeDomainLabelFromLiteralString(&n, name)) { errormsg = "Bad Instance Name"; goto badparam; } |
| if (!regtype[0] || !MakeDomainNameFromDNSNameString(&t, regtype)) { errormsg = "Bad Service Type"; goto badparam; } |
| if (!MakeDomainNameFromDNSNameString(&d, *domain ? domain : "local.")) { errormsg = "Bad Domain"; goto badparam; } |
| if (!ConstructServiceName(&srv, &n, &t, &d)) { errormsg = "Bad Name"; goto badparam; } |
| |
| unsigned char txtinfo[1024] = ""; |
| unsigned int data_len = 0; |
| unsigned int size = sizeof(RDataBody); |
| unsigned char *pstring = &txtinfo[data_len]; |
| char *ptr = txtRecord; |
| |
| // The OS X DNSServiceRegistrationCreate() API is defined using a C-string, |
| // but the mDNS_RegisterService() call actually requires a packed block of P-strings. |
| // Hence we have to convert the C-string to a P-string. |
| // ASCII-1 characters are allowed in the C-string as boundary markers, |
| // so that a single C-string can be used to represent one or more P-strings. |
| while (*ptr) |
| { |
| if (++data_len >= sizeof(txtinfo)) { errormsg = "TXT record too long"; goto badtxt; } |
| if (*ptr == 1) // If this is our boundary marker, start a new P-string |
| { |
| pstring = &txtinfo[data_len]; |
| pstring[0] = 0; |
| ptr++; |
| } |
| else |
| { |
| if (pstring[0] == 255) { errormsg = "TXT record invalid (component longer than 255)"; goto badtxt; } |
| pstring[++pstring[0]] = *ptr++; |
| } |
| } |
| |
| data_len++; |
| if (size < data_len) |
| size = data_len; |
| |
| // 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(port)) |
| { |
| int count = CountExistingRegistrations(&srv, port); |
| if (count) |
| LogMsg("%5d: Client application registered %d identical instances of service %##s port %u.", |
| client, count+1, srv.c, mDNSVal16(port)); |
| } |
| |
| // Allocate memory, and handle failure |
| DNSServiceRegistration *x = mallocL("DNSServiceRegistration", sizeof(*x)); |
| if (!x) { err = mStatus_NoMemoryErr; errormsg = "No memory"; goto fail; } |
| mDNSPlatformMemZero(x, sizeof(*x)); |
| |
| // Set up object, and link into list |
| x->ClientMachPort = client; |
| x->DefaultDomain = !domain[0]; |
| x->autoname = (!name[0]); |
| x->rdsize = size; |
| x->NumSubTypes = NumSubTypes; |
| memcpy(x->regtype, regtype, reglen); |
| x->name = n; |
| x->type = t; |
| x->port = port; |
| memcpy(x->txtinfo, txtinfo, 1024); |
| x->txt_len = data_len; |
| x->NextRef = 0; |
| x->regs = NULL; |
| |
| x->next = DNSServiceRegistrationList; |
| DNSServiceRegistrationList = x; |
| |
| LogOperation("%5d: DNSServiceRegistration(\"%s\", \"%s\", \"%s\", %u) START", |
| x->ClientMachPort, name, regtype, domain, mDNSVal16(port)); |
| |
| err = AddServiceInstance(x, &d); |
| if (err) { AbortClient(client, x); errormsg = "mDNS_RegisterService"; goto fail; } // bail if .local (or explicit domain) fails |
| |
| if (x->DefaultDomain) |
| { |
| DNameListElem *p; |
| for (p = AutoRegistrationDomains; p; p = p->next) |
| AddServiceInstance(x, &p->name); |
| } |
| |
| // Succeeded: Wrap up and return |
| EnableDeathNotificationForClient(client, x); |
| return(mStatus_NoError); |
| |
| badtxt: |
| LogMsg("%5d: TXT record: %.100s...", client, txtRecord); |
| badparam: |
| err = mStatus_BadParamErr; |
| fail: |
| LogMsg("%5d: DNSServiceRegister(\"%s\", \"%s\", \"%s\", %d) failed: %s (%d)", |
| client, name, regtype, domain, mDNSVal16(port), errormsg, err); |
| return(err); |
| } |
| |
| mDNSlocal void mDNSPreferencesSetNames(mDNS *const m, int key, domainlabel *old, domainlabel *new) |
| { |
| domainlabel *prevold, *prevnew; |
| switch (key) |
| { |
| case kmDNSComputerName: |
| case kmDNSLocalHostName: |
| if (key == kmDNSComputerName) |
| { |
| prevold = &m->p->prevoldnicelabel; |
| prevnew = &m->p->prevnewnicelabel; |
| } |
| else |
| { |
| prevold = &m->p->prevoldhostlabel; |
| prevnew = &m->p->prevnewhostlabel; |
| } |
| // There are a few cases where we need to invoke the helper. |
| // |
| // 1. If the "old" label and "new" label are not same, it means there is a conflict. We need |
| // to invoke the helper so that it pops up a dialogue to inform the user about the |
| // conflict |
| // |
| // 2. If the "old" label and "new" label are same, it means the user has set the host/nice label |
| // through the preferences pane. We may have to inform the helper as it may have popped up |
| // a dialogue previously (due to a conflict) and it needs to suppress it now. We can avoid invoking |
| // the helper in this case if the previous values (old and new) that we told helper last time |
| // are same. If the previous old and new values are same, helper does not care. |
| // |
| // Note: "new" can be NULL when we have repeated conflicts and we are asking helper to give up. "old" |
| // is not called with NULL today, but this makes it future proof. |
| if (!old || !new || !SameDomainLabelCS(old->c, new->c) || |
| !SameDomainLabelCS(old->c, prevold->c) || |
| !SameDomainLabelCS(new->c, prevnew->c)) |
| { |
| if (old) |
| *prevold = *old; |
| else |
| prevold->c[0] = 0; |
| if (new) |
| *prevnew = *new; |
| else |
| prevnew->c[0] = 0; |
| mDNSPreferencesSetName(key, old, new); |
| } |
| else |
| { |
| LogInfo("mDNSPreferencesSetNames not invoking helper %s %#s, %s %#s, old %#s, new %#s", |
| (key == kmDNSComputerName ? "prevoldnicelabel" : "prevoldhostlabel"), prevold->c, |
| (key == kmDNSComputerName ? "prevnewnicelabel" : "prevnewhostlabel"), prevnew->c, |
| old->c, new->c); |
| } |
| break; |
| default: |
| LogMsg("mDNSPreferencesSetNames: unrecognized key: %d", key); |
| return; |
| } |
| } |
| |
| mDNSlocal void mDNS_StatusCallback(mDNS *const m, mStatus result) |
| { |
| (void)m; // Unused |
| if (result == mStatus_NoError) |
| { |
| if (!SameDomainLabelCS(m->p->userhostlabel.c, m->hostlabel.c)) |
| LogInfo("Local Hostname changed from \"%#s.local\" to \"%#s.local\"", m->p->userhostlabel.c, m->hostlabel.c); |
| // One second pause in case we get a Computer Name update too -- don't want to alert the user twice |
| RecordUpdatedNiceLabel(m, mDNSPlatformOneSecond); |
| } |
| else if (result == mStatus_NameConflict) |
| { |
| LogInfo("Local Hostname conflict for \"%#s.local\"", m->hostlabel.c); |
| if (!m->p->HostNameConflict) m->p->HostNameConflict = NonZeroTime(m->timenow); |
| else if (m->timenow - m->p->HostNameConflict > 60 * mDNSPlatformOneSecond) |
| { |
| // Tell the helper we've given up |
| mDNSPreferencesSetNames(m, kmDNSLocalHostName, &m->p->userhostlabel, NULL); |
| } |
| } |
| else if (result == mStatus_GrowCache) |
| { |
| // Allocate another chunk of cache storage |
| CacheEntity *storage = mallocL("mStatus_GrowCache", sizeof(CacheEntity) * RR_CACHE_SIZE); |
| //LogInfo("GrowCache %d * %d = %d", sizeof(CacheEntity), RR_CACHE_SIZE, sizeof(CacheEntity) * RR_CACHE_SIZE); |
| if (storage) mDNS_GrowCache(m, storage, RR_CACHE_SIZE); |
| } |
| else if (result == mStatus_ConfigChanged) |
| { |
| // Tell the helper we've seen a change in the labels. It will dismiss the name conflict alert if needed. |
| mDNSPreferencesSetNames(m, kmDNSComputerName, &m->p->usernicelabel, &m->nicelabel); |
| mDNSPreferencesSetNames(m, kmDNSLocalHostName, &m->p->userhostlabel, &m->hostlabel); |
| |
| // First we check our list of old Mach-based registered services, to see if any need to be updated to a new name |
| DNSServiceRegistration *r; |
| for (r = DNSServiceRegistrationList; r; r=r->next) |
| if (r->autoname) |
| { |
| ServiceInstance *si; |
| for (si = r->regs; si; si = si->next) |
| { |
| if (!SameDomainLabelCS(si->name.c, m->nicelabel.c)) |
| { |
| debugf("NetworkChanged renaming %##s to %#s", si->srs.RR_SRV.resrec.name->c, m->nicelabel.c); |
| si->renameonmemfree = mDNStrue; |
| if (mDNS_DeregisterService_drt(m, &si->srs, mDNS_Dereg_rapid)) |
| RegCallback(m, &si->srs, mStatus_MemFree); // If service deregistered already, we can re-register immediately |
| } |
| } |
| } |
| |
| // Then we call into the UDS daemon code, to let it do the same |
| udsserver_handle_configchange(m); |
| } |
| } |
| |
| //************************************************************************************************************* |
| // Add / Update / Remove records from existing Registration |
| |
| mDNSexport kern_return_t provide_DNSServiceRegistrationAddRecord_rpc(mach_port_t unusedserver, mach_port_t client, |
| int type, const char *data, mach_msg_type_number_t data_len, uint32_t ttl, natural_t *reference) |
| { |
| // Check client parameter |
| uint32_t id; |
| mStatus err = mStatus_NoError; |
| const char *errormsg = "Unknown"; |
| DNSServiceRegistration *x = DNSServiceRegistrationList; |
| if (client == (mach_port_t)-1) { err = mStatus_Invalid; errormsg = "Client id -1 invalid"; goto fail; } |
| ServiceInstance *si; |
| size_t size; |
| (void)unusedserver; // Unused |
| while (x && x->ClientMachPort != client) x = x->next; |
| if (!x) { err = mStatus_BadReferenceErr; errormsg = "No such client"; goto fail; } |
| |
| // Check other parameters |
| if (data_len > 8192) { err = mStatus_BadParamErr; errormsg = "data_len > 8K"; goto fail; } |
| if (data_len > sizeof(RDataBody)) size = data_len; |
| else size = sizeof(RDataBody); |
| |
| id = x->NextRef++; |
| *reference = (natural_t)id; |
| for (si = x->regs; si; si = si->next) |
| { |
| // Allocate memory, and handle failure |
| ExtraResourceRecord *extra = mallocL("ExtraResourceRecord", sizeof(*extra) - sizeof(RDataBody) + size); |
| if (!extra) { err = mStatus_NoMemoryErr; errormsg = "No memory"; goto fail; } |
| |
| // Fill in type, length, and data of new record |
| extra->r.resrec.rrtype = type; |
| extra->r.rdatastorage.MaxRDLength = size; |
| extra->r.resrec.rdlength = data_len; |
| memcpy(&extra->r.rdatastorage.u.data, data, data_len); |
| |
| // Do the operation |
| LogOperation("%5d: DNSServiceRegistrationAddRecord(%##s, type %d, length %d) REF %p", |
| client, si->srs.RR_SRV.resrec.name->c, type, data_len, extra); |
| err = mDNS_AddRecordToService(&mDNSStorage, &si->srs, extra, &extra->r.rdatastorage, ttl, 0); |
| |
| if (err) |
| { |
| freeL("Extra Resource Record", extra); |
| errormsg = "mDNS_AddRecordToService"; |
| goto fail; |
| } |
| |
| extra->ClientID = id; |
| } |
| |
| return mStatus_NoError; |
| |
| fail: |
| LogMsg("%5d: DNSServiceRegistrationAddRecord(%##s, type %d, length %d) failed: %s (%d)", client, x ? x->name.c : (mDNSu8*)"\x8" "«NULL»", type, data_len, errormsg, err); |
| return mStatus_UnknownErr; |
| } |
| |
| mDNSlocal void UpdateCallback(mDNS *const m, AuthRecord *const rr, RData *OldRData, mDNSu16 OldRDLen) |
| { |
| (void)m; // Unused |
| (void)OldRDLen; // Unused |
| if (OldRData != &rr->rdatastorage) |
| freeL("Old RData", OldRData); |
| } |
| |
| mDNSlocal mStatus UpdateRecord(ServiceRecordSet *srs, mach_port_t client, AuthRecord *rr, const char *data, mach_msg_type_number_t data_len, uint32_t ttl) |
| { |
| // Check client parameter |
| mStatus err = mStatus_NoError; |
| const char *errormsg = "Unknown"; |
| const domainname *name = (const domainname *)""; |
| |
| name = srs->RR_SRV.resrec.name; |
| |
| unsigned int size = sizeof(RDataBody); |
| if (size < data_len) |
| size = data_len; |
| |
| // Allocate memory, and handle failure |
| RData *newrdata = mallocL("RData", sizeof(*newrdata) - sizeof(RDataBody) + size); |
| if (!newrdata) { err = mStatus_NoMemoryErr; errormsg = "No memory"; goto fail; } |
| |
| // Fill in new length, and data |
| newrdata->MaxRDLength = size; |
| memcpy(&newrdata->u, data, data_len); |
| |
| // 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 && data_len == 0) { data_len = 1; newrdata->u.txt.c[0] = 0; } |
| |
| // Do the operation |
| LogOperation("%5d: DNSServiceRegistrationUpdateRecord(%##s, new length %d)", |
| client, srs->RR_SRV.resrec.name->c, data_len); |
| |
| err = mDNS_Update(&mDNSStorage, rr, ttl, data_len, newrdata, UpdateCallback); |
| if (err) |
| { |
| errormsg = "mDNS_Update"; |
| freeL("RData", newrdata); |
| return err; |
| } |
| return(mStatus_NoError); |
| |
| fail: |
| LogMsg("%5d: DNSServiceRegistrationUpdateRecord(%##s, %d) failed: %s (%d)", client, name->c, data_len, errormsg, err); |
| return(err); |
| } |
| |
| mDNSexport kern_return_t provide_DNSServiceRegistrationUpdateRecord_rpc(mach_port_t unusedserver, mach_port_t client, |
| natural_t reference, const char *data, mach_msg_type_number_t data_len, uint32_t ttl) |
| { |
| // Check client parameter |
| mStatus err = mStatus_NoError; |
| const char *errormsg = "Unknown"; |
| const domainname *name = (const domainname *)""; |
| ServiceInstance *si; |
| |
| (void)unusedserver; // unused |
| if (client == (mach_port_t)-1) { err = mStatus_Invalid; errormsg = "Client id -1 invalid"; goto fail; } |
| DNSServiceRegistration *x = DNSServiceRegistrationList; |
| while (x && x->ClientMachPort != client) x = x->next; |
| if (!x) { err = mStatus_BadReferenceErr; errormsg = "No such client"; goto fail; } |
| |
| // Check other parameters |
| if (data_len > 8192) { err = mStatus_BadParamErr; errormsg = "data_len > 8K"; goto fail; } |
| |
| for (si = x->regs; si; si = si->next) |
| { |
| AuthRecord *r = NULL; |
| |
| // Find the record we're updating. NULL reference means update the primary TXT record |
| if (!reference) r = &si->srs.RR_TXT; |
| else |
| { |
| ExtraResourceRecord *ptr; |
| for (ptr = si->srs.Extras; ptr; ptr = ptr->next) |
| { |
| if ((natural_t)ptr->ClientID == reference) |
| { r = &ptr->r; break; } |
| } |
| if (!r) { err = mStatus_BadReferenceErr; errormsg = "No such record"; goto fail; } |
| } |
| err = UpdateRecord(&si->srs, client, r, data, data_len, ttl); |
| if (err) goto fail; //!!!KRS this will cause failures for non-local defaults! |
| } |
| |
| return mStatus_NoError; |
| |
| fail: |
| LogMsg("%5d: DNSServiceRegistrationUpdateRecord(%##s, %X, %d) failed: %s (%d)", client, name->c, reference, data_len, errormsg, err); |
| return(err); |
| } |
| |
| mDNSlocal mStatus RemoveRecord(ServiceRecordSet *srs, ExtraResourceRecord *extra, mach_port_t client) |
| { |
| const domainname *const name = srs->RR_SRV.resrec.name; |
| mStatus err = mStatus_NoError; |
| |
| // Do the operation |
| LogOperation("%5d: DNSServiceRegistrationRemoveRecord(%##s)", client, srs->RR_SRV.resrec.name->c); |
| |
| err = mDNS_RemoveRecordFromService(&mDNSStorage, srs, extra, FreeExtraRR, extra); |
| if (err) LogMsg("%5d: DNSServiceRegistrationRemoveRecord (%##s) failed: %d", client, name->c, err); |
| |
| return err; |
| } |
| |
| mDNSexport kern_return_t provide_DNSServiceRegistrationRemoveRecord_rpc(mach_port_t unusedserver, mach_port_t client, |
| natural_t reference) |
| { |
| // Check client parameter |
| (void)unusedserver; // Unused |
| mStatus err = mStatus_NoError; |
| const char *errormsg = "Unknown"; |
| if (client == (mach_port_t)-1) { err = mStatus_Invalid; errormsg = "Client id -1 invalid"; goto fail; } |
| DNSServiceRegistration *x = DNSServiceRegistrationList; |
| ServiceInstance *si; |
| |
| while (x && x->ClientMachPort != client) x = x->next; |
| if (!x) { err = mStatus_BadReferenceErr; errormsg = "No such client"; goto fail; } |
| |
| for (si = x->regs; si; si = si->next) |
| { |
| ExtraResourceRecord *e; |
| for (e = si->srs.Extras; e; e = e->next) |
| { |
| if ((natural_t)e->ClientID == reference) |
| { |
| err = RemoveRecord(&si->srs, e, client); |
| break; |
| } |
| } |
| if (!e) { err = mStatus_BadReferenceErr; errormsg = "No such reference"; goto fail; } |
| } |
| |
| return mStatus_NoError; |
| |
| fail: |
| LogMsg("%5d: DNSServiceRegistrationRemoveRecord(%X) failed: %s (%d)", client, reference, errormsg, err); |
| return(err); |
| } |
| |
| //************************************************************************************************************* |
| #if COMPILER_LIKES_PRAGMA_MARK |
| #pragma mark - |
| #pragma mark - Startup, shutdown, and supporting code |
| #endif |
| |
| mDNSlocal void DNSserverCallback(CFMachPortRef port, void *msg, CFIndex size, void *info) |
| { |
| mig_reply_error_t *request = msg; |
| mig_reply_error_t *reply; |
| mach_msg_return_t mr; |
| int options; |
| (void)port; // Unused |
| (void)size; // Unused |
| (void)info; // Unused |
| |
| KQueueLock(&mDNSStorage); |
| |
| /* allocate a reply buffer */ |
| reply = CFAllocatorAllocate(NULL, provide_DNSServiceDiscoveryRequest_subsystem.maxsize, 0); |
| |
| /* call the MiG server routine */ |
| (void) DNSServiceDiscoveryRequest_server(&request->Head, &reply->Head); |
| |
| if (!(reply->Head.msgh_bits & MACH_MSGH_BITS_COMPLEX) && (reply->RetCode != KERN_SUCCESS)) |
| { |
| if (reply->RetCode == MIG_NO_REPLY) |
| { |
| /* |
| * This return code is a little tricky -- it appears that the |
| * demux routine found an error of some sort, but since that |
| * error would not normally get returned either to the local |
| * user or the remote one, we pretend it's ok. |
| */ |
| CFAllocatorDeallocate(NULL, reply); |
| goto done; |
| } |
| |
| /* |
| * destroy any out-of-line data in the request buffer but don't destroy |
| * the reply port right (since we need that to send an error message). |
| */ |
| request->Head.msgh_remote_port = MACH_PORT_NULL; |
| mach_msg_destroy(&request->Head); |
| } |
| |
| if (reply->Head.msgh_remote_port == MACH_PORT_NULL) |
| { |
| /* no reply port, so destroy the reply */ |
| if (reply->Head.msgh_bits & MACH_MSGH_BITS_COMPLEX) |
| mach_msg_destroy(&reply->Head); |
| CFAllocatorDeallocate(NULL, reply); |
| goto done; |
| } |
| |
| /* |
| * send reply. |
| * |
| * We don't want to block indefinitely because the client |
| * isn't receiving messages from the reply port. |
| * If we have a send-once right for the reply port, then |
| * this isn't a concern because the send won't block. |
| * If we have a send right, we need to use MACH_SEND_TIMEOUT. |
| * To avoid falling off the kernel's fast RPC path unnecessarily, |
| * we only supply MACH_SEND_TIMEOUT when absolutely necessary. |
| */ |
| |
| options = MACH_SEND_MSG; |
| if (MACH_MSGH_BITS_REMOTE(reply->Head.msgh_bits) == MACH_MSG_TYPE_MOVE_SEND_ONCE) |
| options |= MACH_SEND_TIMEOUT; |
| |
| mr = mach_msg(&reply->Head, /* msg */ |
| options, /* option */ |
| reply->Head.msgh_size, /* send_size */ |
| 0, /* rcv_size */ |
| MACH_PORT_NULL, /* rcv_name */ |
| MACH_MSG_TIMEOUT_NONE, /* timeout */ |
| MACH_PORT_NULL); /* notify */ |
| |
| /* Has a message error occurred? */ |
| switch (mr) |
| { |
| case MACH_SEND_INVALID_DEST: |
| case MACH_SEND_TIMED_OUT: |
| /* the reply can't be delivered, so destroy it */ |
| mach_msg_destroy(&reply->Head); |
| break; |
| |
| default: |
| /* Includes success case. */ |
| break; |
| } |
| |
| CFAllocatorDeallocate(NULL, reply); |
| |
| done: |
| KQueueUnlock(&mDNSStorage, "Mach client event"); |
| } |
| |
| mDNSlocal kern_return_t registerBootstrapService() |
| { |
| kern_return_t status; |
| mach_port_t service_rcv_port; |
| |
| LogMsg("Registering Bootstrap Service"); |
| |
| /* |
| * See if our service name is already registered and if we have privilege to check in. |
| */ |
| status = bootstrap_check_in(bootstrap_port, (char*)kmDNSBootstrapName, &service_rcv_port); |
| if (status == KERN_SUCCESS) |
| { |
| /* |
| * If so, we must be a followup instance of an already defined server. In that case, |
| * the bootstrap port we inherited from our parent is the server's privilege port, so set |
| * that in case we have to unregister later (which requires the privilege port). |
| */ |
| server_priv_port = bootstrap_port; |
| restarting_via_mach_init = TRUE; |
| } |
| else |
| { |
| LogMsg("registerBootstrapService: ERROR!! Registering Bootstrap Service failed %d", status); |
| return status; |
| } |
| |
| /* |
| * We have no intention of responding to requests on the service port. We are not otherwise |
| * a Mach port-based service. We are just using this mechanism for relaunch facilities. |
| * So, we can dispose of all the rights we have for the service port. We don't destroy the |
| * send right for the server's privileged bootstrap port - in case we have to unregister later. |
| */ |
| mach_port_destroy(mach_task_self(), service_rcv_port); |
| return status; |
| } |
| |
| mDNSlocal kern_return_t destroyBootstrapService() |
| { |
| debugf("Destroying Bootstrap Service"); |
| return bootstrap_register(server_priv_port, (char*)kmDNSBootstrapName, MACH_PORT_NULL); |
| } |
| |
| mDNSlocal void ExitCallback(int sig) |
| { |
| (void)sig; // Unused |
| LogMsg("%s stopping", mDNSResponderVersionString); |
| |
| debugf("ExitCallback"); |
| if (!mDNS_DebugMode && !started_via_launchdaemon) |
| destroyBootstrapService(); |
| |
| debugf("ExitCallback: Aborting MIG clients"); |
| while (DNSServiceDomainEnumerationList) |
| AbortClient(DNSServiceDomainEnumerationList->ClientMachPort, DNSServiceDomainEnumerationList); |
| while (DNSServiceBrowserList) |
| AbortClient(DNSServiceBrowserList->ClientMachPort, DNSServiceBrowserList); |
| while (DNSServiceResolverList) |
| AbortClient(DNSServiceResolverList->ClientMachPort, DNSServiceResolverList); |
| while (DNSServiceRegistrationList) |
| AbortClient(DNSServiceRegistrationList->ClientMachPort, DNSServiceRegistrationList); |
| |
| if (udsserver_exit() < 0) LogMsg("ExitCallback: udsserver_exit failed"); |
| |
| debugf("ExitCallback: mDNS_StartExit"); |
| mDNS_StartExit(&mDNSStorage); |
| } |
| |
| #ifndef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| |
| // Send a mach_msg to ourselves (since that is signal safe) telling us to cleanup and exit |
| mDNSlocal void HandleSIG(int sig) |
| { |
| kern_return_t status; |
| mach_msg_header_t header; |
| |
| // WARNING: can't call syslog or fprintf from signal handler |
| header.msgh_bits = MACH_MSGH_BITS(MACH_MSG_TYPE_MAKE_SEND, 0); |
| header.msgh_remote_port = signal_port; |
| header.msgh_local_port = MACH_PORT_NULL; |
| header.msgh_size = sizeof(header); |
| header.msgh_id = sig; |
| |
| status = mach_msg(&header, MACH_SEND_MSG | MACH_SEND_TIMEOUT, header.msgh_size, |
| 0, MACH_PORT_NULL, 0, MACH_PORT_NULL); |
| |
| if (status != MACH_MSG_SUCCESS) |
| { |
| if (status == MACH_SEND_TIMED_OUT) mach_msg_destroy(&header); |
| if (sig == SIGTERM || sig == SIGINT) exit(-1); |
| } |
| } |
| |
| #endif // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| |
| mDNSlocal void INFOCallback(void) |
| { |
| mDNSs32 utc = mDNSPlatformUTC(); |
| DNSServiceDomainEnumeration *e; |
| DNSServiceBrowser *b; |
| DNSServiceResolver *l; |
| DNSServiceRegistration *r; |
| NetworkInterfaceInfoOSX *i; |
| DNSServer *s; |
| McastResolver *mr; |
| |
| LogMsg("---- BEGIN STATE LOG ---- %s %s %d", mDNSResponderVersionString, OSXVers ? "OSXVers" : "iOSVers", OSXVers ? OSXVers : iOSVers); |
| |
| udsserver_info(&mDNSStorage); |
| |
| LogMsgNoIdent("--------- Mach Clients ---------"); |
| if (!DNSServiceDomainEnumerationList && !DNSServiceBrowserList && !DNSServiceResolverList && !DNSServiceRegistrationList) |
| LogMsgNoIdent("<None>"); |
| else |
| { |
| for (e = DNSServiceDomainEnumerationList; e; e=e->next) |
| LogMsgNoIdent("%5d: Mach DomainEnumeration %##s", e->ClientMachPort, e->dom.qname.c); |
| |
| for (b = DNSServiceBrowserList; b; b=b->next) |
| { |
| DNSServiceBrowserQuestion *qptr; |
| for (qptr = b->qlist; qptr; qptr = qptr->next) |
| LogMsgNoIdent("%5d: Mach ServiceBrowse %##s", b->ClientMachPort, qptr->q.qname.c); |
| } |
| |
| for (l = DNSServiceResolverList; l; l=l->next) |
| LogMsgNoIdent("%5d: Mach ServiceResolve %##s", l->ClientMachPort, l->i.name.c); |
| |
| for (r = DNSServiceRegistrationList; r; r=r->next) |
| { |
| ServiceInstance *si; |
| for (si = r->regs; si; si = si->next) |
| LogMsgNoIdent("%5d: Mach ServiceInstance %##s %u", si->ClientMachPort, si->srs.RR_SRV.resrec.name->c, mDNSVal16(si->srs.RR_SRV.resrec.rdata->u.srv.port)); |
| } |
| } |
| |
| LogMsgNoIdent("----- KQSocketEventSources -----"); |
| if (!gEventSources) LogMsgNoIdent("<None>"); |
| else |
| { |
| KQSocketEventSource *k; |
| for (k = gEventSources; k; k=k->next) |
| { |
| LogMsgNoIdent("%3d %s", k->fd, k->kqs.KQtask); |
| usleep((mDNSStorage.KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000); |
| } |
| } |
| |
| LogMsgNoIdent("------ Network Interfaces ------"); |
| if (!mDNSStorage.p->InterfaceList) LogMsgNoIdent("<None>"); |
| else |
| { |
| for (i = mDNSStorage.p->InterfaceList; i; i = i->next) |
| { |
| // Allow six characters for interface name, for names like "vmnet8" |
| if (!i->Exists) |
| LogMsgNoIdent("%p %2ld, Registered %p, %s %-6s(%lu) %.6a %.6a %#-14a dormant for %d seconds", |
| i, i->ifinfo.InterfaceID, i->Registered, |
| i->sa_family == AF_INET ? "v4" : i->sa_family == AF_INET6 ? "v6" : "??", i->ifinfo.ifname, i->scope_id, &i->ifinfo.MAC, &i->BSSID, |
| &i->ifinfo.ip, utc - i->LastSeen); |
| else |
| { |
| const CacheRecord *sps[3]; |
| FindSPSInCache(&mDNSStorage, &i->ifinfo.NetWakeBrowse, sps); |
| LogMsgNoIdent("%p %2ld, Registered %p, %s %-6s(%lu) %.6a %.6a %s %s %-15.4a %s %s %s %s %#a", |
| i, i->ifinfo.InterfaceID, i->Registered, |
| i->sa_family == AF_INET ? "v4" : i->sa_family == AF_INET6 ? "v6" : "??", i->ifinfo.ifname, i->scope_id, &i->ifinfo.MAC, &i->BSSID, |
| i->ifinfo.InterfaceActive ? "Active" : " ", |
| i->ifinfo.IPv4Available ? "v4" : " ", |
| i->ifinfo.IPv4Available ? (mDNSv4Addr*)&i->ifa_v4addr : &zerov4Addr, |
| i->ifinfo.IPv6Available ? "v6" : " ", |
| i->ifinfo.Advertise ? "⊙" : " ", |
| i->ifinfo.McastTxRx ? "⇆" : " ", |
| !(i->ifinfo.InterfaceActive && i->ifinfo.NetWake) ? " " : !sps[0] ? "☼" : "☀", |
| &i->ifinfo.ip); |
| |
| if (sps[0]) LogMsgNoIdent(" %13d %#s", SPSMetric(sps[0]->resrec.rdata->u.name.c), sps[0]->resrec.rdata->u.name.c); |
| if (sps[1]) LogMsgNoIdent(" %13d %#s", SPSMetric(sps[1]->resrec.rdata->u.name.c), sps[1]->resrec.rdata->u.name.c); |
| if (sps[2]) LogMsgNoIdent(" %13d %#s", SPSMetric(sps[2]->resrec.rdata->u.name.c), sps[2]->resrec.rdata->u.name.c); |
| } |
| } |
| } |
| |
| LogMsgNoIdent("--------- DNS Servers ----------"); |
| if (!mDNSStorage.DNSServers) LogMsgNoIdent("<None>"); |
| else |
| { |
| for (s = mDNSStorage.DNSServers; s; s = s->next) |
| { |
| NetworkInterfaceInfoOSX *ifx = IfindexToInterfaceInfoOSX(&mDNSStorage, s->interface); |
| LogMsgNoIdent("DNS Server %##s %s%s%#a:%d %d %s %d %d %s", |
| s->domain.c, ifx ? ifx->ifinfo.ifname : "", ifx ? " " : "", &s->addr, mDNSVal16(s->port), |
| s->penaltyTime ? s->penaltyTime - mDNS_TimeNow(&mDNSStorage) : 0, s->scoped ? "Scoped" : "", |
| s->timeout, s->resGroupID, |
| s->teststate == DNSServer_Untested ? "(Untested)" : |
| s->teststate == DNSServer_Passed ? "" : |
| s->teststate == DNSServer_Failed ? "(Failed)" : |
| s->teststate == DNSServer_Disabled ? "(Disabled)" : "(Unknown state)"); |
| } |
| } |
| |
| LogMsgNoIdent("--------- Mcast Resolvers ----------"); |
| if (!mDNSStorage.McastResolvers) LogMsgNoIdent("<None>"); |
| else |
| { |
| for (mr = mDNSStorage.McastResolvers; mr; mr = mr->next) |
| LogMsgNoIdent("Mcast Resolver %##s timeout %u", mr->domain.c, mr->timeout); |
| } |
| |
| mDNSs32 now = mDNS_TimeNow(&mDNSStorage); |
| LogMsgNoIdent("Timenow 0x%08lX (%d)", (mDNSu32)now, now); |
| |
| LogMsg("---- END STATE LOG ---- %s %s %d", mDNSResponderVersionString, OSXVers ? "OSXVers" : "iOSVers", OSXVers ? OSXVers : iOSVers); |
| } |
| |
| #ifndef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| |
| mDNSlocal void SignalCallback(CFMachPortRef port, void *msg, CFIndex size, void *info) |
| { |
| (void)port; // Unused |
| (void)size; // Unused |
| (void)info; // Unused |
| mach_msg_header_t *msg_header = (mach_msg_header_t *)msg; |
| mDNS *const m = &mDNSStorage; |
| |
| // We're running on the CFRunLoop (Mach port) thread, not the kqueue thread, so we need to grab the KQueueLock before proceeding |
| KQueueLock(m); |
| switch(msg_header->msgh_id) |
| { |
| case SIGHUP: { |
| mDNSu32 slot; |
| CacheGroup *cg; |
| CacheRecord *rr; |
| LogMsg("SIGHUP: Purge cache"); |
| mDNS_Lock(m); |
| FORALL_CACHERECORDS(slot, cg, rr) |
| { |
| mDNS_PurgeCacheResourceRecord(m, rr); |
| } |
| // Restart unicast and multicast queries |
| mDNSCoreRestartQueries(m); |
| mDNS_Unlock(m); |
| } break; |
| case SIGINT: |
| case SIGTERM: ExitCallback(msg_header->msgh_id); break; |
| case SIGINFO: INFOCallback(); break; |
| case SIGUSR1: mDNS_LoggingEnabled = mDNS_LoggingEnabled ? 0 : 1; |
| LogMsg("SIGUSR1: Logging %s", mDNS_LoggingEnabled ? "Enabled" : "Disabled"); |
| WatchDogReportingThreshold = mDNS_LoggingEnabled ? 50 : 250; |
| break; |
| case SIGUSR2: mDNS_PacketLoggingEnabled = mDNS_PacketLoggingEnabled ? 0 : 1; |
| LogMsg("SIGUSR2: Packet Logging %s", mDNS_PacketLoggingEnabled ? "Enabled" : "Disabled"); |
| break; |
| case SIGIO: |
| m->mDNSHandlePeerEvents = m->mDNSHandlePeerEvents ? mDNSfalse : mDNStrue; |
| LogMsg("SIGIO: Handle AWDL Peer Events %s", m->mDNSHandlePeerEvents ? "Enabled" : "Disabled"); |
| break; |
| |
| default: LogMsg("SignalCallback: Unknown signal %d", msg_header->msgh_id); break; |
| } |
| KQueueUnlock(m, "Unix Signal"); |
| } |
| |
| // On 10.2 the MachServerName is DNSServiceDiscoveryServer |
| // On 10.3 and later, the MachServerName is com.apple.mDNSResponder |
| mDNSlocal kern_return_t mDNSDaemonInitialize(void) |
| { |
| mStatus err; |
| CFMachPortRef s_port; |
| CFRunLoopSourceRef s_rls; |
| CFRunLoopSourceRef d_rls; |
| |
| // If launchd already created our Mach port for us, then use that, else we create a new one of our own |
| if (m_port != MACH_PORT_NULL) |
| s_port = CFMachPortCreateWithPort(NULL, m_port, DNSserverCallback, NULL, NULL); |
| else |
| { |
| s_port = CFMachPortCreate(NULL, DNSserverCallback, NULL, NULL); |
| m_port = CFMachPortGetPort(s_port); |
| kern_return_t status = bootstrap_register(bootstrap_port, "com.apple.mDNSResponder", m_port); |
| |
| if (status) |
| { |
| if (status == 1103) |
| LogMsg("bootstrap_register() failed: A copy of the daemon is apparently already running"); |
| else |
| LogMsg("bootstrap_register() failed: %d %X %s", status, status, mach_error_string(status)); |
| return(status); |
| } |
| } |
| |
| CFMachPortRef d_port = CFMachPortCreate(NULL, ClientDeathCallback, NULL, NULL); |
| |
| err = mDNS_Init(&mDNSStorage, &PlatformStorage, |
| rrcachestorage, RR_CACHE_SIZE, |
| advertise, |
| mDNS_StatusCallback, mDNS_Init_NoInitCallbackContext); |
| |
| if (err) { LogMsg("Daemon start: mDNS_Init failed %d", err); return(err); } |
| |
| client_death_port = CFMachPortGetPort(d_port); |
| |
| s_rls = CFMachPortCreateRunLoopSource(NULL, s_port, 0); |
| CFRunLoopAddSource(PlatformStorage.CFRunLoop, s_rls, kCFRunLoopDefaultMode); |
| CFRelease(s_rls); |
| |
| d_rls = CFMachPortCreateRunLoopSource(NULL, d_port, 0); |
| CFRunLoopAddSource(PlatformStorage.CFRunLoop, d_rls, kCFRunLoopDefaultMode); |
| CFRelease(d_rls); |
| |
| CFMachPortRef i_port = CFMachPortCreate(NULL, SignalCallback, NULL, NULL); |
| CFRunLoopSourceRef i_rls = CFMachPortCreateRunLoopSource(NULL, i_port, 0); |
| signal_port = CFMachPortGetPort(i_port); |
| CFRunLoopAddSource(PlatformStorage.CFRunLoop, i_rls, kCFRunLoopDefaultMode); |
| CFRelease(i_rls); |
| |
| if (mDNS_DebugMode) printf("Service registered with Mach Port %d\n", m_port); |
| return(err); |
| } |
| |
| #else // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| |
| // SignalDispatch is mostly just a copy/paste of entire code block from SignalCallback above. |
| // The common code should be a subroutine, or we end up having to fix bugs in two places all the time. |
| // The same applies to mDNSDaemonInitialize, much of which is just a copy/paste of chunks |
| // of code from above. Alternatively we could remove the duplicated source code by having |
| // single routines, with the few differing parts bracketed with "#ifndef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM" |
| |
| mDNSlocal void SignalDispatch(dispatch_source_t source) |
| { |
| int sig = (int)dispatch_source_get_handle(source); |
| mDNS *const m = &mDNSStorage; |
| KQueueLock(m); |
| switch(sig) |
| { |
| case SIGHUP: { |
| mDNSu32 slot; |
| CacheGroup *cg; |
| CacheRecord *rr; |
| LogMsg("SIGHUP: Purge cache"); |
| mDNS_Lock(m); |
| FORALL_CACHERECORDS(slot, cg, rr) |
| { |
| mDNS_PurgeCacheResourceRecord(m, rr); |
| } |
| // Restart unicast and multicast queries |
| mDNSCoreRestartQueries(m); |
| mDNS_Unlock(m); |
| } break; |
| case SIGINT: |
| case SIGTERM: ExitCallback(sig); break; |
| case SIGINFO: INFOCallback(); break; |
| case SIGUSR1: mDNS_LoggingEnabled = mDNS_LoggingEnabled ? 0 : 1; |
| LogMsg("SIGUSR1: Logging %s", mDNS_LoggingEnabled ? "Enabled" : "Disabled"); |
| WatchDogReportingThreshold = mDNS_LoggingEnabled ? 50 : 250; |
| break; |
| case SIGUSR2: mDNS_PacketLoggingEnabled = mDNS_PacketLoggingEnabled ? 0 : 1; |
| LogMsg("SIGUSR2: Packet Logging %s", mDNS_PacketLoggingEnabled ? "Enabled" : "Disabled"); |
| break; |
| default: LogMsg("SignalCallback: Unknown signal %d", sig); break; |
| } |
| KQueueUnlock(m, "Unix Signal"); |
| } |
| |
| mDNSlocal void mDNSSetupSignal(dispatch_queue_t queue, int sig) |
| { |
| signal(sig, SIG_IGN); |
| dispatch_source_t source = dispatch_source_create(DISPATCH_SOURCE_TYPE_SIGNAL, sig, 0, queue); |
| |
| if (source) |
| { |
| dispatch_source_set_event_handler(source, ^{SignalDispatch(source);}); |
| // Start processing signals |
| dispatch_resume(source); |
| } |
| else |
| { |
| LogMsg("mDNSSetupSignal: Cannot setup signal %d", sig); |
| } |
| } |
| |
| // On 10.2 the MachServerName is DNSServiceDiscoveryServer |
| // On 10.3 and later, the MachServerName is com.apple.mDNSResponder |
| mDNSlocal kern_return_t mDNSDaemonInitialize(void) |
| { |
| mStatus err; |
| CFMachPortRef s_port; |
| dispatch_source_t mach_source; |
| dispatch_queue_t queue = dispatch_get_main_queue(); |
| |
| // If launchd already created our Mach port for us, then use that, else we create a new one of our own |
| if (m_port != MACH_PORT_NULL) |
| s_port = CFMachPortCreateWithPort(NULL, m_port, DNSserverCallback, NULL, NULL); |
| else |
| { |
| s_port = CFMachPortCreate(NULL, DNSserverCallback, NULL, NULL); |
| m_port = CFMachPortGetPort(s_port); |
| kern_return_t status = bootstrap_register(bootstrap_port, "com.apple.mDNSResponder", m_port); |
| |
| if (status) |
| { |
| if (status == 1103) |
| LogMsg("bootstrap_register() failed: A copy of the daemon is apparently already running"); |
| else |
| LogMsg("bootstrap_register() failed: %d %X %s", status, status, mach_error_string(status)); |
| return(status); |
| } |
| } |
| |
| err = mDNS_Init(&mDNSStorage, &PlatformStorage, |
| rrcachestorage, RR_CACHE_SIZE, |
| advertise, |
| mDNS_StatusCallback, mDNS_Init_NoInitCallbackContext); |
| |
| if (err) { LogMsg("Daemon start: mDNS_Init failed %d", err); return(err); } |
| |
| mach_source = dispatch_source_create(DISPATCH_SOURCE_TYPE_MACH_RECV, m_port, 0, queue); |
| if (mach_source == mDNSNULL) {LogMsg("mDNSDaemonInitialize: Error creating source for m_port"); return -1;} |
| dispatch_source_set_event_handler(mach_source, ^{ |
| dispatch_mig_server(mach_source, sizeof(union __RequestUnion__DNSServiceDiscoveryReply_subsystem), |
| DNSServiceDiscoveryRequest_server); |
| }); |
| dispatch_resume(mach_source); |
| |
| mDNSSetupSignal(queue, SIGHUP); |
| mDNSSetupSignal(queue, SIGINT); |
| mDNSSetupSignal(queue, SIGTERM); |
| mDNSSetupSignal(queue, SIGINFO); |
| mDNSSetupSignal(queue, SIGUSR1); |
| mDNSSetupSignal(queue, SIGUSR2); |
| mDNSSetupSignal(queue, SIGIO); |
| |
| // Create a custom handler for doing the housekeeping work. This is either triggered |
| // by the timer or an event source |
| PlatformStorage.custom = dispatch_source_create(DISPATCH_SOURCE_TYPE_DATA_ADD, 0, 0, queue); |
| if (PlatformStorage.custom == mDNSNULL) {LogMsg("mDNSDaemonInitialize: Error creating custom source"); return -1;} |
| dispatch_source_set_event_handler(PlatformStorage.custom, ^{PrepareForIdle(&mDNSStorage);}); |
| dispatch_resume(PlatformStorage.custom); |
| |
| // Create a timer source to trigger housekeeping work. The houskeeping work itself |
| // is done in the custom handler that we set below. |
| |
| PlatformStorage.timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue); |
| if (PlatformStorage.timer == mDNSNULL) {LogMsg("mDNSDaemonInitialize: Error creating timer source"); return -1;} |
| |
| // As the API does not support one shot timers, we pass zero for the interval. In the custom handler, we |
| // always reset the time to the new time computed. In effect, we ignore the interval |
| dispatch_source_set_timer(PlatformStorage.timer, DISPATCH_TIME_NOW, 1000ull * 1000000000, 0); |
| dispatch_source_set_event_handler(PlatformStorage.timer, ^{ |
| dispatch_source_merge_data(PlatformStorage.custom, 1); |
| }); |
| dispatch_resume(PlatformStorage.timer); |
| |
| LogMsg("DaemonIntialize done successfully"); |
| |
| if (mDNS_DebugMode) printf("Service registered with Mach Port %d\n", m_port); |
| return(err); |
| } |
| |
| #endif // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| |
| mDNSlocal mDNSs32 mDNSDaemonIdle(mDNS *const m) |
| { |
| mDNSs32 now = mDNS_TimeNow(m); |
| |
| // 1. If we need to set domain secrets, do so before handling the network change |
| // Detailed reason: |
| // BTMM domains listed in DynStore Setup:/Network/BackToMyMac are added to the registration domains list, |
| // and we need to setup the associated AutoTunnel DomainAuthInfo entries before that happens. |
| if (m->p->KeyChainTimer && now - m->p->KeyChainTimer >= 0) |
| { |
| m->p->KeyChainTimer = 0; |
| mDNS_Lock(m); |
| SetDomainSecrets(m); |
| mDNS_Unlock(m); |
| } |
| |
| // 2. If we have network change events to handle, do them before calling mDNS_Execute() |
| // Detailed reason: |
| // mDNSMacOSXNetworkChanged() currently closes and re-opens its sockets. If there are received packets waiting, they are lost. |
| // mDNS_Execute() generates packets, including multicasts that are looped back to ourself. |
| // If we call mDNS_Execute() first, and generate packets, and then call mDNSMacOSXNetworkChanged() immediately afterwards |
| // we then systematically lose our own looped-back packets. |
| if (m->p->NetworkChanged && now - m->p->NetworkChanged >= 0) mDNSMacOSXNetworkChanged(m); |
| |
| if (m->p->RequestReSleep && now - m->p->RequestReSleep >= 0) { m->p->RequestReSleep = 0; mDNSPowerRequest(0, 0); } |
| |
| // 3. Call mDNS_Execute() to let mDNSCore do what it needs to do |
| mDNSs32 nextevent = mDNS_Execute(m); |
| |
| if (m->p->NetworkChanged) |
| if (nextevent - m->p->NetworkChanged > 0) |
| nextevent = m->p->NetworkChanged; |
| |
| if (m->p->KeyChainTimer) |
| if (nextevent - m->p->KeyChainTimer > 0) |
| nextevent = m->p->KeyChainTimer; |
| |
| if (m->p->RequestReSleep) |
| if (nextevent - m->p->RequestReSleep > 0) |
| nextevent = m->p->RequestReSleep; |
| |
| // 4. Deliver any waiting browse messages to clients |
| DNSServiceBrowser *b = DNSServiceBrowserList; |
| |
| while (b) |
| { |
| // Note: Need to advance b to the next element BEFORE we call DeliverInstance(), because in the |
| // event that the client Mach queue overflows, DeliverInstance() will call AbortBlockedClient() |
| // and that will cause the DNSServiceBrowser object's memory to be freed before it returns |
| DNSServiceBrowser *x = b; |
| b = b->next; |
| if (x->results) // Try to deliver the list of results |
| { |
| while (x->results) |
| { |
| DNSServiceBrowserResult *const r = x->results; |
| domainlabel name; |
| domainname type, domain; |
| DeconstructServiceName(&r->result, &name, &type, &domain); // Don't need to check result; already validated in FoundInstance() |
| char cname[MAX_DOMAIN_LABEL+1]; // Unescaped name: up to 63 bytes plus C-string terminating NULL. |
| char ctype[MAX_ESCAPED_DOMAIN_NAME]; |
| char cdom [MAX_ESCAPED_DOMAIN_NAME]; |
| ConvertDomainLabelToCString_unescaped(&name, cname); |
| ConvertDomainNameToCString(&type, ctype); |
| ConvertDomainNameToCString(&domain, cdom); |
| DNSServiceDiscoveryReplyFlags flags = (r->next) ? DNSServiceDiscoverReplyFlagsMoreComing : 0; |
| kern_return_t status = DNSServiceBrowserReply_rpc(x->ClientMachPort, r->resultType, cname, ctype, cdom, flags, 1); |
| // If we failed to send the mach message, try again in one second |
| if (status == MACH_SEND_TIMED_OUT) |
| { |
| if (nextevent - now > mDNSPlatformOneSecond) |
| nextevent = now + mDNSPlatformOneSecond; |
| break; |
| } |
| else |
| { |
| x->lastsuccess = now; |
| x->results = x->results->next; |
| freeL("DNSServiceBrowserResult", r); |
| } |
| } |
| // If this client hasn't read a single message in the last 60 seconds, abort it |
| if (now - x->lastsuccess >= 60 * mDNSPlatformOneSecond) |
| AbortBlockedClient(x->ClientMachPort, "browse", x); |
| } |
| } |
| |
| DNSServiceResolver *l; |
| for (l = DNSServiceResolverList; l; l=l->next) |
| if (l->ReportTime && now - l->ReportTime >= 0) |
| { |
| l->ReportTime = 0; |
| LogMsgNoIdent("Client application bug: DNSServiceResolver(%##s) active for over two minutes. " |
| "This places considerable burden on the network.", l->i.name.c); |
| } |
| |
| if (m->p->NotifyUser) |
| { |
| if (m->p->NotifyUser - now < 0) |
| { |
| if (!SameDomainLabelCS(m->p->usernicelabel.c, m->nicelabel.c)) |
| { |
| LogMsg("Name Conflict: Updated Computer Name from \"%#s\" to \"%#s\"", m->p->usernicelabel.c, m->nicelabel.c); |
| mDNSPreferencesSetNames(m, kmDNSComputerName, &m->p->usernicelabel, &m->nicelabel); |
| m->p->usernicelabel = m->nicelabel; |
| } |
| if (!SameDomainLabelCS(m->p->userhostlabel.c, m->hostlabel.c)) |
| { |
| LogMsg("Name Conflict: Updated Local Hostname from \"%#s.local\" to \"%#s.local\"", m->p->userhostlabel.c, m->hostlabel.c); |
| mDNSPreferencesSetNames(m, kmDNSLocalHostName, &m->p->userhostlabel, &m->hostlabel); |
| m->p->HostNameConflict = 0; // Clear our indicator, now name change has been successful |
| m->p->userhostlabel = m->hostlabel; |
| } |
| m->p->NotifyUser = 0; |
| } |
| else |
| if (nextevent - m->p->NotifyUser > 0) |
| nextevent = m->p->NotifyUser; |
| } |
| |
| return(nextevent); |
| } |
| |
| // Right now we consider *ALL* of our DHCP leases |
| // It might make sense to be a bit more selective and only consider the leases on interfaces |
| // (a) that are capable and enabled for wake-on-LAN, and |
| // (b) where we have found (and successfully registered with) a Sleep Proxy |
| // If we can't be woken for traffic on a given interface, then why keep waking to renew its lease? |
| mDNSlocal mDNSu32 DHCPWakeTime(void) |
| { |
| mDNSu32 e = 24 * 3600; // Maximum maintenance wake interval is 24 hours |
| const CFAbsoluteTime now = CFAbsoluteTimeGetCurrent(); |
| if (!now) LogMsg("DHCPWakeTime: CFAbsoluteTimeGetCurrent failed"); |
| else |
| { |
| int ic, j; |
| |
| const void *pattern = SCDynamicStoreKeyCreateNetworkServiceEntity(NULL, kSCDynamicStoreDomainState, kSCCompAnyRegex, kSCEntNetDHCP); |
| if (!pattern) |
| { |
| LogMsg("DHCPWakeTime: SCDynamicStoreKeyCreateNetworkServiceEntity failed\n"); |
| return e; |
| } |
| CFArrayRef dhcpinfo = CFArrayCreate(NULL, (const void **)&pattern, 1, &kCFTypeArrayCallBacks); |
| CFRelease(pattern); |
| if (dhcpinfo) |
| { |
| SCDynamicStoreRef store = SCDynamicStoreCreate(NULL, CFSTR("DHCP-LEASES"), NULL, NULL); |
| if (store) |
| { |
| CFDictionaryRef dict = SCDynamicStoreCopyMultiple(store, NULL, dhcpinfo); |
| if (dict) |
| { |
| ic = CFDictionaryGetCount(dict); |
| const void *vals[ic]; |
| CFDictionaryGetKeysAndValues(dict, NULL, vals); |
| |
| for (j = 0; j < ic; j++) |
| { |
| const CFDictionaryRef dhcp = (CFDictionaryRef)vals[j]; |
| if (dhcp) |
| { |
| const CFDateRef start = DHCPInfoGetLeaseStartTime(dhcp); |
| const CFDataRef lease = DHCPInfoGetOptionData(dhcp, 51); // Option 51 = IP Address Lease Time |
| if (!start || !lease || CFDataGetLength(lease) < 4) |
| LogMsg("DHCPWakeTime: SCDynamicStoreCopyDHCPInfo index %d failed " |
| "CFDateRef start %p CFDataRef lease %p CFDataGetLength(lease) %d", |
| j, start, lease, lease ? CFDataGetLength(lease) : 0); |
| else |
| { |
| const UInt8 *d = CFDataGetBytePtr(lease); |
| if (!d) LogMsg("DHCPWakeTime: CFDataGetBytePtr %d failed", j); |
| else |
| { |
| const mDNSu32 elapsed = now - CFDateGetAbsoluteTime(start); |
| const mDNSu32 lifetime = (mDNSs32) ((mDNSs32)d[0] << 24 | (mDNSs32)d[1] << 16 | (mDNSs32)d[2] << 8 | d[3]); |
| const mDNSu32 remaining = lifetime - elapsed; |
| const mDNSu32 wake = remaining > 60 ? remaining - remaining/10 : 54; // Wake at 90% of the lease time |
| LogSPS("DHCP Address Lease Elapsed %6u Lifetime %6u Remaining %6u Wake %6u", elapsed, lifetime, remaining, wake); |
| if (e > wake) e = wake; |
| } |
| } |
| } |
| } |
| CFRelease(dict); |
| } |
| CFRelease(store); |
| } |
| CFRelease(dhcpinfo); |
| } |
| } |
| return(e); |
| } |
| |
| // We deliberately schedule our wakeup for halfway between when we'd *like* it and when we *need* it. |
| // For example, if our DHCP lease expires in two hours, we'll typically renew it at the halfway point, after one hour. |
| // If we scheduled our wakeup for the one-hour renewal time, that might be just seconds from now, and sleeping |
| // for a few seconds and then waking again is silly and annoying. |
| // If we scheduled our wakeup for the two-hour expiry time, and we were slow to wake, we might lose our lease. |
| // Scheduling our wakeup for halfway in between -- 90 minutes -- avoids short wakeups while still |
| // allowing us an adequate safety margin to renew our lease before we lose it. |
| |
| mDNSlocal mDNSBool AllowSleepNow(mDNS *const m, mDNSs32 now) |
| { |
| mDNSBool ready = mDNSCoreReadyForSleep(m, now); |
| if (m->SleepState && !ready && now - m->SleepLimit < 0) return(mDNSfalse); |
| |
| m->p->WakeAtUTC = 0; |
| int result = kIOReturnSuccess; |
| CFDictionaryRef opts = NULL; |
| |
| // If the sleep request was cancelled, and we're no longer planning to sleep, don't need to |
| // do the stuff below, but we *DO* still need to acknowledge the sleep message we received. |
| if (!m->SleepState) |
| LogMsg("AllowSleepNow: Sleep request was canceled with %d ticks remaining", m->SleepLimit - now); |
| else |
| { |
| if (!m->SystemWakeOnLANEnabled || !mDNSCoreHaveAdvertisedMulticastServices(m)) |
| LogSPS("AllowSleepNow: Not scheduling wakeup: SystemWakeOnLAN %s enabled; %s advertised services", |
| m->SystemWakeOnLANEnabled ? "is" : "not", |
| mDNSCoreHaveAdvertisedMulticastServices(m) ? "have" : "no"); |
| else |
| { |
| mDNSs32 dhcp = DHCPWakeTime(); |
| LogSPS("ComputeWakeTime: DHCP Wake %d", dhcp); |
| mDNSs32 interval = mDNSCoreIntervalToNextWake(m, now) / mDNSPlatformOneSecond; |
| if (interval > dhcp) interval = dhcp; |
| |
| // If we're not ready to sleep (failed to register with Sleep Proxy, maybe because of |
| // transient network problem) then schedule a wakeup in one hour to try again. Otherwise, |
| // a single SPS failure could result in a remote machine falling permanently asleep, requiring |
| // someone to go to the machine in person to wake it up again, which would be unacceptable. |
| if (!ready && interval > 3600) interval = 3600; |
| |
| //interval = 48; // For testing |
| |
| #ifdef kIOPMAcknowledgmentOptionSystemCapabilityRequirements |
| if (m->p->IOPMConnection) // If lightweight-wake capability is available, use that |
| { |
| const CFDateRef WakeDate = CFDateCreate(NULL, CFAbsoluteTimeGetCurrent() + interval); |
| if (!WakeDate) LogMsg("ScheduleNextWake: CFDateCreate failed"); |
| else |
| { |
| const mDNSs32 reqs = kIOPMSystemPowerStateCapabilityNetwork; |
| const CFNumberRef Requirements = CFNumberCreate(NULL, kCFNumberSInt32Type, &reqs); |
| if (!Requirements) LogMsg("ScheduleNextWake: CFNumberCreate failed"); |
| else |
| { |
| const void *OptionKeys[2] = { CFSTR("WakeDate"), CFSTR("Requirements") }; |
| const void *OptionVals[2] = { WakeDate, Requirements }; |
| opts = CFDictionaryCreate(NULL, (void*)OptionKeys, (void*)OptionVals, 2, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks); |
| if (!opts) LogMsg("ScheduleNextWake: CFDictionaryCreate failed"); |
| CFRelease(Requirements); |
| } |
| CFRelease(WakeDate); |
| } |
| LogSPS("AllowSleepNow: Will request lightweight wakeup in %d seconds", interval); |
| } |
| else // else schedule the wakeup using the old API instead to |
| #endif |
| { |
| // If we wake within +/- 30 seconds of our requested time we'll assume the system woke for us, |
| // so we should put it back to sleep. To avoid frustrating the user, we always request at least |
| // 60 seconds sleep, so if they immediately re-wake the system within seconds of it going to sleep, |
| // we then shouldn't hit our 30-second window, and we won't attempt to re-sleep the machine. |
| if (interval < 60) interval = 60; |
| |
| result = mDNSPowerRequest(1, interval); |
| |
| if (result == kIOReturnNotReady) |
| { |
| int r; |
| LogMsg("AllowSleepNow: Requested wakeup in %d seconds unsuccessful; retrying with longer intervals", interval); |
| // IOPMSchedulePowerEvent fails with kIOReturnNotReady (-536870184/0xe00002d8) if the |
| // requested wake time is "too soon", but there's no API to find out what constitutes |
| // "too soon" on any given OS/hardware combination, so if we get kIOReturnNotReady |
| // we just have to iterate with successively longer intervals until it doesn't fail. |
| // We preserve the value of "result" because if our original power request was deemed "too soon" |
| // for the machine to get to sleep and wake back up again, we attempt to cancel the sleep request, |
| // since the implication is that the system won't manage to be awake again at the time we need it. |
| do |
| { |
| interval += (interval < 20) ? 1 : ((interval+3) / 4); |
| r = mDNSPowerRequest(1, interval); |
| } |
| while (r == kIOReturnNotReady); |
| if (r) LogMsg("AllowSleepNow: Requested wakeup in %d seconds unsuccessful: %d %X", interval, r, r); |
| else LogSPS("AllowSleepNow: Requested later wakeup in %d seconds; will also attempt IOCancelPowerChange", interval); |
| } |
| else |
| { |
| if (result) LogMsg("AllowSleepNow: Requested wakeup in %d seconds unsuccessful: %d %X", interval, result, result); |
| else LogSPS("AllowSleepNow: Requested wakeup in %d seconds", interval); |
| } |
| m->p->WakeAtUTC = mDNSPlatformUTC() + interval; |
| } |
| } |
| |
| m->SleepState = SleepState_Sleeping; |
| // We used to clear our interface list to empty state here before going to sleep. |
| // The applications that try to connect to an external server during maintenance wakes, saw |
| // DNS resolution errors as we don't have any interfaces (most queries use SuppressUnusable |
| // flag). Thus, we don't remove our interfaces anymore on sleep. |
| } |
| |
| LogSPS("AllowSleepNow: %s(%lX) %s at %ld (%d ticks remaining)", |
| #if !TARGET_OS_EMBEDDED && defined(kIOPMAcknowledgmentOptionSystemCapabilityRequirements) |
| (m->p->IOPMConnection) ? "IOPMConnectionAcknowledgeEventWithOptions" : |
| #endif |
| (result == kIOReturnSuccess) ? "IOAllowPowerChange" : "IOCancelPowerChange", |
| m->p->SleepCookie, ready ? "ready for sleep" : "giving up", now, m->SleepLimit - now); |
| |
| m->SleepLimit = 0; // Don't clear m->SleepLimit until after we've logged it above |
| |
| #if !TARGET_OS_EMBEDDED && defined(kIOPMAcknowledgmentOptionSystemCapabilityRequirements) |
| if (m->p->IOPMConnection) IOPMConnectionAcknowledgeEventWithOptions(m->p->IOPMConnection, m->p->SleepCookie, opts); |
| else |
| #endif |
| if (result == kIOReturnSuccess) IOAllowPowerChange (m->p->PowerConnection, m->p->SleepCookie); |
| else IOCancelPowerChange(m->p->PowerConnection, m->p->SleepCookie); |
| |
| if (opts) CFRelease(opts); |
| return(mDNStrue); |
| } |
| |
| #ifdef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| |
| mDNSexport void TriggerEventCompletion() |
| { |
| debugf("TriggerEventCompletion: Merge data"); |
| dispatch_source_merge_data(PlatformStorage.custom, 1); |
| } |
| |
| mDNSlocal void PrepareForIdle(void *m_param) |
| { |
| mDNS *m = m_param; |
| int64_t time_offset; |
| dispatch_time_t dtime; |
| |
| const int multiplier = 1000000000 / mDNSPlatformOneSecond; |
| |
| // This is the main work loop: |
| // (1) First we give mDNSCore a chance to finish off any of its deferred work and calculate the next sleep time |
| // (2) Then we make sure we've delivered all waiting browse messages to our clients |
| // (3) Then we sleep for the time requested by mDNSCore, or until the next event, whichever is sooner |
| |
| debugf("PrepareForIdle: called"); |
| // Run mDNS_Execute to find out the time we next need to wake up |
| mDNSs32 start = mDNSPlatformRawTime(); |
| mDNSs32 nextTimerEvent = udsserver_idle(mDNSDaemonIdle(m)); |
| mDNSs32 end = mDNSPlatformRawTime(); |
| if (end - start >= WatchDogReportingThreshold) |
| LogInfo("CustomSourceHandler:WARNING: Idle task took %dms to complete", end - start); |
| |
| mDNSs32 now = mDNS_TimeNow(m); |
| |
| if (m->ShutdownTime) |
| { |
| if (mDNSStorage.ResourceRecords) |
| { |
| LogInfo("Cannot exit yet; Resource Record still exists: %s", ARDisplayString(m, mDNSStorage.ResourceRecords)); |
| if (mDNS_LoggingEnabled) usleep(10000); // Sleep 10ms so that we don't flood syslog with too many messages |
| } |
| if (mDNS_ExitNow(m, now)) |
| { |
| LogInfo("IdleLoop: mDNS_FinalExit"); |
| mDNS_FinalExit(&mDNSStorage); |
| usleep(1000); // Little 1ms pause before exiting, so we don't lose our final syslog messages |
| exit(0); |
| } |
| if (nextTimerEvent - m->ShutdownTime >= 0) |
| nextTimerEvent = m->ShutdownTime; |
| } |
| |
| if (m->SleepLimit) |
| if (!AllowSleepNow(m, now)) |
| if (nextTimerEvent - m->SleepLimit >= 0) |
| nextTimerEvent = m->SleepLimit; |
| |
| // Convert absolute wakeup time to a relative time from now |
| mDNSs32 ticks = nextTimerEvent - now; |
| if (ticks < 1) ticks = 1; |
| |
| static mDNSs32 RepeatedBusy = 0; // Debugging sanity check, to guard against CPU spins |
| if (ticks > 1) |
| RepeatedBusy = 0; |
| else |
| { |
| ticks = 1; |
| if (++RepeatedBusy >= mDNSPlatformOneSecond) { ShowTaskSchedulingError(&mDNSStorage); RepeatedBusy = 0; } |
| } |
| |
| time_offset = ((mDNSu32)ticks / mDNSPlatformOneSecond) * 1000000000 + (ticks % mDNSPlatformOneSecond) * multiplier; |
| dtime = dispatch_time(DISPATCH_TIME_NOW, time_offset); |
| dispatch_source_set_timer(PlatformStorage.timer, dtime, 1000ull*1000000000, 0); |
| debugf("PrepareForIdle: scheduling timer with ticks %d", ticks); |
| return; |
| } |
| |
| #else // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| |
| mDNSlocal void KQWokenFlushBytes(int fd, __unused short filter, __unused void *context) |
| { |
| // Read all of the bytes so we won't wake again. |
| char buffer[100]; |
| while (recv(fd, buffer, sizeof(buffer), MSG_DONTWAIT) > 0) continue; |
| } |
| |
| mDNSlocal void * KQueueLoop(void *m_param) |
| { |
| mDNS *m = m_param; |
| int numevents = 0; |
| |
| #if USE_SELECT_WITH_KQUEUEFD |
| fd_set readfds; |
| FD_ZERO(&readfds); |
| const int multiplier = 1000000 / mDNSPlatformOneSecond; |
| #else |
| const int multiplier = 1000000000 / mDNSPlatformOneSecond; |
| #endif |
| |
| pthread_mutex_lock(&PlatformStorage.BigMutex); |
| LogInfo("Starting time value 0x%08lX (%ld)", (mDNSu32)mDNSStorage.timenow_last, mDNSStorage.timenow_last); |
| |
| // This is the main work loop: |
| // (1) First we give mDNSCore a chance to finish off any of its deferred work and calculate the next sleep time |
| // (2) Then we make sure we've delivered all waiting browse messages to our clients |
| // (3) Then we sleep for the time requested by mDNSCore, or until the next event, whichever is sooner |
| // (4) On wakeup we first process *all* events |
| // (5) then when no more events remain, we go back to (1) to finish off any deferred work and do it all again |
| for ( ; ; ) |
| { |
| #define kEventsToReadAtOnce 1 |
| struct kevent new_events[kEventsToReadAtOnce]; |
| |
| // Run mDNS_Execute to find out the time we next need to wake up |
| mDNSs32 start = mDNSPlatformRawTime(); |
| mDNSs32 nextTimerEvent = udsserver_idle(mDNSDaemonIdle(m)); |
| mDNSs32 end = mDNSPlatformRawTime(); |
| if (end - start >= WatchDogReportingThreshold) |
| LogInfo("WARNING: Idle task took %dms to complete", end - start); |
| |
| mDNSs32 now = mDNS_TimeNow(m); |
| |
| if (m->ShutdownTime) |
| { |
| if (mDNSStorage.ResourceRecords) |
| { |
| AuthRecord *rr; |
| for (rr = mDNSStorage.ResourceRecords; rr; rr=rr->next) |
| { |
| LogInfo("Cannot exit yet; Resource Record still exists: %s", ARDisplayString(m, rr)); |
| if (mDNS_LoggingEnabled) usleep(10000); // Sleep 10ms so that we don't flood syslog with too many messages |
| } |
| } |
| if (mDNS_ExitNow(m, now)) |
| { |
| LogInfo("mDNS_FinalExit"); |
| mDNS_FinalExit(&mDNSStorage); |
| usleep(1000); // Little 1ms pause before exiting, so we don't lose our final syslog messages |
| exit(0); |
| } |
| if (nextTimerEvent - m->ShutdownTime >= 0) |
| nextTimerEvent = m->ShutdownTime; |
| } |
| |
| if (m->SleepLimit) |
| if (!AllowSleepNow(m, now)) |
| if (nextTimerEvent - m->SleepLimit >= 0) |
| nextTimerEvent = m->SleepLimit; |
| |
| // Convert absolute wakeup time to a relative time from now |
| mDNSs32 ticks = nextTimerEvent - now; |
| if (ticks < 1) ticks = 1; |
| |
| static mDNSs32 RepeatedBusy = 0; // Debugging sanity check, to guard against CPU spins |
| if (ticks > 1) |
| RepeatedBusy = 0; |
| else |
| { |
| ticks = 1; |
| if (++RepeatedBusy >= mDNSPlatformOneSecond) { ShowTaskSchedulingError(&mDNSStorage); RepeatedBusy = 0; } |
| } |
| |
| verbosedebugf("KQueueLoop: Handled %d events; now sleeping for %d ticks", numevents, ticks); |
| numevents = 0; |
| |
| // Release the lock, and sleep until: |
| // 1. Something interesting happens like a packet arriving, or |
| // 2. The other thread writes a byte to WakeKQueueLoopFD to poke us and make us wake up, or |
| // 3. The timeout expires |
| pthread_mutex_unlock(&PlatformStorage.BigMutex); |
| |
| #if USE_SELECT_WITH_KQUEUEFD |
| struct timeval timeout; |
| timeout.tv_sec = ticks / mDNSPlatformOneSecond; |
| timeout.tv_usec = (ticks % mDNSPlatformOneSecond) * multiplier; |
| FD_SET(KQueueFD, &readfds); |
| if (select(KQueueFD+1, &readfds, NULL, NULL, &timeout) < 0) |
| { LogMsg("select(%d) failed errno %d (%s)", KQueueFD, errno, strerror(errno)); sleep(1); } |
| #else |
| struct timespec timeout; |
| timeout.tv_sec = ticks / mDNSPlatformOneSecond; |
| timeout.tv_nsec = (ticks % mDNSPlatformOneSecond) * multiplier; |
| // In my opinion, you ought to be able to call kevent() with nevents set to zero, |
| // and have it work similarly to the way it does with nevents non-zero -- |
| // i.e. it waits until either an event happens or the timeout expires, and then wakes up. |
| // In fact, what happens if you do this is that it just returns immediately. So, we have |
| // to pass nevents set to one, and then we just ignore the event it gives back to us. -- SC |
| if (kevent(KQueueFD, NULL, 0, new_events, 1, &timeout) < 0) |
| { LogMsg("kevent(%d) failed errno %d (%s)", KQueueFD, errno, strerror(errno)); sleep(1); } |
| #endif |
| |
| pthread_mutex_lock(&PlatformStorage.BigMutex); |
| // We have to ignore the event we may have been told about above, because that |
| // was done without holding the lock, and between the time we woke up and the |
| // time we reclaimed the lock the other thread could have done something that |
| // makes the event no longer valid. Now we have the lock, we call kevent again |
| // and this time we can safely process the events it tells us about. |
| |
| static const struct timespec zero_timeout = { 0, 0 }; |
| int events_found; |
| while ((events_found = kevent(KQueueFD, NULL, 0, new_events, kEventsToReadAtOnce, &zero_timeout)) != 0) |
| { |
| if (events_found > kEventsToReadAtOnce || (events_found < 0 && errno != EINTR)) |
| { |
| // Not sure what to do here, our kqueue has failed us - this isn't ideal |
| LogMsg("ERROR: KQueueLoop - kevent failed errno %d (%s)", errno, strerror(errno)); |
| exit(errno); |
| } |
| |
| numevents += events_found; |
| |
| int i; |
| for (i = 0; i < events_found; i++) |
| { |
| const KQueueEntry *const kqentry = new_events[i].udata; |
| mDNSs32 stime = mDNSPlatformRawTime(); |
| const char *const KQtask = kqentry->KQtask; // Grab a copy in case KQcallback deletes the task |
| kqentry->KQcallback(new_events[i].ident, new_events[i].filter, kqentry->KQcontext); |
| mDNSs32 etime = mDNSPlatformRawTime(); |
| if (etime - stime >= WatchDogReportingThreshold) |
| LogInfo("WARNING: %s took %dms to complete", KQtask, etime - stime); |
| } |
| } |
| } |
| |
| return NULL; |
| } |
| |
| #endif // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| |
| mDNSlocal void LaunchdCheckin(void) |
| { |
| launch_data_t msg = launch_data_new_string(LAUNCH_KEY_CHECKIN); |
| launch_data_t resp = launch_msg(msg); |
| launch_data_free(msg); |
| if (!resp) { LogMsg("launch_msg returned NULL"); return; } |
| |
| if (launch_data_get_type(resp) == LAUNCH_DATA_ERRNO) |
| { |
| int err = launch_data_get_errno(resp); |
| // When running on Tiger with "ServiceIPC = false", we get "err == EACCES" to tell us there's no launchdata to fetch |
| if (err != EACCES) LogMsg("launch_msg returned %d", err); |
| else LogInfo("Launchd provided no launchdata; will open Mach port and Unix Domain Socket explicitly...", err); |
| } |
| else |
| { |
| launch_data_t skts = launch_data_dict_lookup(resp, LAUNCH_JOBKEY_SOCKETS); |
| if (!skts) LogMsg("launch_data_dict_lookup LAUNCH_JOBKEY_SOCKETS returned NULL"); |
| else |
| { |
| launch_data_t skt = launch_data_dict_lookup(skts, "Listeners"); |
| if (!skt) LogMsg("launch_data_dict_lookup Listeners returned NULL"); |
| else |
| { |
| launchd_fds_count = launch_data_array_get_count(skt); |
| if (launchd_fds_count == 0) LogMsg("launch_data_array_get_count(skt) returned 0"); |
| else |
| { |
| launchd_fds = mallocL("LaunchdCheckin", sizeof(dnssd_sock_t) * launchd_fds_count); |
| if (!launchd_fds) LogMsg("LaunchdCheckin: malloc failed"); |
| else |
| { |
| size_t i; |
| for(i = 0; i < launchd_fds_count; i++) |
| { |
| launch_data_t s = launch_data_array_get_index(skt, i); |
| if (!s) |
| { |
| launchd_fds[i] = dnssd_InvalidSocket; |
| LogMsg("launch_data_array_get_index(skt, %d) returned NULL", i); |
| } |
| else |
| { |
| launchd_fds[i] = launch_data_get_fd(s); |
| LogInfo("Launchd Unix Domain Socket [%d]: %d", i, launchd_fds[i]); |
| } |
| } |
| } |
| // In some early versions of 10.4.x, the permissions on the UDS were not set correctly, so we fix them here |
| chmod(MDNS_UDS_SERVERPATH, S_IRUSR|S_IWUSR | S_IRGRP|S_IWGRP | S_IROTH|S_IWOTH); |
| } |
| } |
| } |
| |
| launch_data_t ports = launch_data_dict_lookup(resp, "MachServices"); |
| if (!ports) LogMsg("launch_data_dict_lookup MachServices returned NULL"); |
| else |
| { |
| launch_data_t p = launch_data_dict_lookup(ports, "com.apple.mDNSResponder"); |
| if (!p) LogInfo("launch_data_dict_lookup(ports, \"com.apple.mDNSResponder\") returned NULL"); |
| else |
| { |
| m_port = launch_data_get_fd(p); |
| LogInfo("Launchd Mach Port: %d", m_port); |
| if (m_port == ~0U) m_port = MACH_PORT_NULL; |
| } |
| } |
| } |
| launch_data_free(resp); |
| } |
| |
| mDNSlocal void DropPrivileges(void) |
| { |
| static const char login[] = "_mdnsresponder"; |
| struct passwd *pwd = getpwnam(login); |
| if (NULL == pwd) |
| LogMsg("Could not find account name \"%s\". Running as root.", login); |
| else |
| { |
| uid_t uid = pwd->pw_uid; |
| gid_t gid = pwd->pw_gid; |
| |
| LogMsg("Started as root. Switching to userid \"%s\".", login); |
| |
| if (unlink(MDNS_UDS_SERVERPATH) < 0 && errno != ENOENT) LogMsg("DropPrivileges: Could not unlink \"%s\": (%d) %s", MDNS_UDS_SERVERPATH, errno, strerror(errno)); |
| else |
| { |
| static char path[] = "/var/run/mdns/mDNSResponder"; |
| char *p = strrchr(path, '/'); |
| *p = '\0'; |
| if (mkdir(path, 0755) < 0 && errno != EEXIST) LogMsg("DropPrivileges: Could not create directory \"%s\": (%d) %s", path, errno, strerror(errno)); |
| else if (chown(path, uid, gid) < 0) LogMsg("DropPrivileges: Could not chown directory \"%s\": (%d) %s", path, errno, strerror(errno)); |
| else |
| { |
| *p = '/'; |
| if (unlink(path) < 0 && errno != ENOENT) LogMsg("DropPrivileges: Could not unlink \"%s\": (%d) %s", path, errno, strerror(errno)); |
| else if (symlink(path, MDNS_UDS_SERVERPATH) < 0) LogMsg("DropPrivileges: Could not symlink \"%s\" -> \"%s\": (%d) %s", MDNS_UDS_SERVERPATH, path, errno, strerror(errno)); |
| else LogInfo("DropPrivileges: Created subdirectory and symlink"); |
| } |
| } |
| |
| if (0 != initgroups(login, gid)) LogMsg("initgroups(\"%s\", %lu) failed. Continuing.", login, (unsigned long)gid); |
| if (0 != setgid(gid)) LogMsg("setgid(%lu) failed. Continuing with group %lu privileges.", (unsigned long)getegid()); |
| if (0 != setuid(uid)) LogMsg("setuid(%lu) failed. Continuing as root after all.", (unsigned long)uid); |
| } |
| } |
| |
| extern int sandbox_init(const char *profile, uint64_t flags, char **errorbuf) __attribute__((weak_import)); |
| |
| mDNSexport int main(int argc, char **argv) |
| { |
| int i; |
| kern_return_t status; |
| |
| mDNSMacOSXSystemBuildNumber(NULL); |
| LogMsg("%s starting %s %d", mDNSResponderVersionString, OSXVers ? "OSXVers" : "iOSVers", OSXVers ? OSXVers : iOSVers); |
| |
| #if 0 |
| LogMsg("CacheRecord %d", sizeof(CacheRecord)); |
| LogMsg("CacheGroup %d", sizeof(CacheGroup)); |
| LogMsg("ResourceRecord %d", sizeof(ResourceRecord)); |
| LogMsg("RData_small %d", sizeof(RData_small)); |
| |
| LogMsg("sizeof(CacheEntity) %d", sizeof(CacheEntity)); |
| LogMsg("RR_CACHE_SIZE %d", RR_CACHE_SIZE); |
| LogMsg("block usage %d", sizeof(CacheEntity) * RR_CACHE_SIZE); |
| LogMsg("block wastage %d", 16*1024 - sizeof(CacheEntity) * RR_CACHE_SIZE); |
| #endif |
| |
| if (0 == geteuid()) DropPrivileges(); |
| |
| for (i=1; i<argc; i++) |
| { |
| if (!strcasecmp(argv[i], "-d" )) mDNS_DebugMode = mDNStrue; |
| if (!strcasecmp(argv[i], "-launchd" )) started_via_launchdaemon = mDNStrue; |
| if (!strcasecmp(argv[i], "-launchdaemon" )) started_via_launchdaemon = mDNStrue; |
| if (!strcasecmp(argv[i], "-NoMulticastAdvertisements")) advertise = mDNS_Init_DontAdvertiseLocalAddresses; |
| if (!strcasecmp(argv[i], "-DisableSleepProxyClient" )) DisableSleepProxyClient = mDNStrue; |
| if (!strcasecmp(argv[i], "-DebugLogging" )) mDNS_LoggingEnabled = mDNStrue; |
| if (!strcasecmp(argv[i], "-UnicastPacketLogging" )) mDNS_PacketLoggingEnabled = mDNStrue; |
| if (!strcasecmp(argv[i], "-OfferSleepProxyService" )) |
| OfferSleepProxyService = (i+1 < argc && mDNSIsDigit(argv[i+1][0]) && mDNSIsDigit(argv[i+1][1]) && argv[i+1][2]==0) ? atoi(argv[++i]) : 100; |
| if (!strcasecmp(argv[i], "-UseInternalSleepProxy" )) |
| UseInternalSleepProxy = (i+1<argc && mDNSIsDigit(argv[i+1][0]) && argv[i+1][1]==0) ? atoi(argv[++i]) : 1; |
| if (!strcasecmp(argv[i], "-StrictUnicastOrdering" )) StrictUnicastOrdering = mDNStrue; |
| if (!strcasecmp(argv[i], "-AlwaysAppendSearchDomains")) AlwaysAppendSearchDomains = mDNStrue; |
| } |
| |
| // Note that mDNSPlatformInit will set DivertMulticastAdvertisements in the mDNS structure |
| if (!advertise) LogMsg("Administratively prohibiting multicast advertisements"); |
| |
| #ifndef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| |
| signal(SIGHUP, HandleSIG); // (Debugging) Purge the cache to check for cache handling bugs |
| signal(SIGINT, HandleSIG); // Ctrl-C: Detach from Mach BootstrapService and exit cleanly |
| signal(SIGPIPE, SIG_IGN ); // Don't want SIGPIPE signals -- we'll handle EPIPE errors directly |
| signal(SIGTERM, HandleSIG); // Machine shutting down: Detach from and exit cleanly like Ctrl-C |
| signal(SIGINFO, HandleSIG); // (Debugging) Write state snapshot to syslog |
| signal(SIGUSR1, HandleSIG); // (Debugging) Enable Logging |
| signal(SIGUSR2, HandleSIG); // (Debugging) Enable Packet Logging |
| signal(SIGIO, HandleSIG); // (Debugging) Toggle AWDL Peer Event Handling |
| |
| #endif // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| |
| mDNSStorage.p = &PlatformStorage; // Make sure mDNSStorage.p is set up, because validatelists uses it |
| LaunchdCheckin(); |
| |
| // Register the server with mach_init for automatic restart only during normal (non-debug) mode |
| if (!mDNS_DebugMode && !started_via_launchdaemon) |
| { |
| registerBootstrapService(); |
| if (!restarting_via_mach_init) exit(0); // mach_init will restart us immediately as a daemon |
| int fd = open(_PATH_DEVNULL, O_RDWR, 0); |
| if (fd < 0) LogMsg("open(_PATH_DEVNULL, O_RDWR, 0) failed errno %d (%s)", errno, strerror(errno)); |
| else |
| { |
| // Avoid unnecessarily duplicating a file descriptor to itself |
| if (fd != STDIN_FILENO) if (dup2(fd, STDIN_FILENO) < 0) LogMsg("dup2(fd, STDIN_FILENO) failed errno %d (%s)", errno, strerror(errno)); |
| if (fd != STDOUT_FILENO) if (dup2(fd, STDOUT_FILENO) < 0) LogMsg("dup2(fd, STDOUT_FILENO) failed errno %d (%s)", errno, strerror(errno)); |
| if (fd != STDERR_FILENO) if (dup2(fd, STDERR_FILENO) < 0) LogMsg("dup2(fd, STDERR_FILENO) failed errno %d (%s)", errno, strerror(errno)); |
| if (fd != STDIN_FILENO && fd != STDOUT_FILENO && fd != STDERR_FILENO) (void)close(fd); |
| } |
| } |
| |
| #ifndef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| |
| // Create the kqueue, mutex and thread to support KQSockets |
| KQueueFD = kqueue(); |
| if (KQueueFD == -1) { LogMsg("kqueue() failed errno %d (%s)", errno, strerror(errno)); status = errno; goto exit; } |
| |
| i = pthread_mutex_init(&PlatformStorage.BigMutex, NULL); |
| if (i == -1) { LogMsg("pthread_mutex_init() failed errno %d (%s)", errno, strerror(errno)); status = errno; goto exit; } |
| |
| int fdpair[2] = {0, 0}; |
| i = socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair); |
| if (i == -1) { LogMsg("socketpair() failed errno %d (%s)", errno, strerror(errno)); status = errno; goto exit; } |
| |
| // Socket pair returned us two identical sockets connected to each other |
| // We will use the first socket to send the second socket. The second socket |
| // will be added to the kqueue so it will wake when data is sent. |
| static const KQueueEntry wakeKQEntry = { KQWokenFlushBytes, NULL, "kqueue wakeup after CFRunLoop event" }; |
| |
| PlatformStorage.WakeKQueueLoopFD = fdpair[0]; |
| KQueueSet(fdpair[1], EV_ADD, EVFILT_READ, &wakeKQEntry); |
| |
| #endif // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| |
| // Invoke sandbox profile /usr/share/sandbox/mDNSResponder.sb |
| #if MDNS_NO_SANDBOX |
| LogMsg("Note: Compiled without Apple Sandbox support"); |
| #else // MDNS_NO_SANDBOX |
| if (!sandbox_init) |
| LogMsg("Note: Running without Apple Sandbox support (not available on this OS)"); |
| else |
| { |
| char *sandbox_msg; |
| uint64_t sandbox_flags = SANDBOX_NAMED; |
| |
| int sandbox_err = sandbox_init("mDNSResponder", sandbox_flags, &sandbox_msg); |
| if (sandbox_err) { LogMsg("WARNING: sandbox_init error %s", sandbox_msg); sandbox_free_error(sandbox_msg); } |
| else LogInfo("Now running under Apple Sandbox restrictions"); |
| } |
| #endif // MDNS_NO_SANDBOX |
| |
| // We use BeginTransactionAtShutdown in the plist that ensures that we will |
| // receive a SIGTERM during shutdown rather than a SIGKILL. But launchd (due to some |
| // limitation) currently requires us to still start and end the transaction for |
| // its proper initialization. |
| vproc_transaction_t vt = vproc_transaction_begin(NULL); |
| if (vt) vproc_transaction_end(NULL, vt); |
| |
| status = mDNSDaemonInitialize(); |
| if (status) { LogMsg("Daemon start: mDNSDaemonInitialize failed"); goto exit; } |
| |
| status = udsserver_init(launchd_fds, launchd_fds_count); |
| if (status) { LogMsg("Daemon start: udsserver_init failed"); goto exit; } |
| |
| mDNSMacOSXNetworkChanged(&mDNSStorage); |
| |
| #ifdef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| LogInfo("Daemon Start: Using LibDispatch"); |
| // CFRunLoopRun runs both CFRunLoop sources and dispatch sources |
| CFRunLoopRun(); |
| #else // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| // Start the kqueue thread |
| pthread_t KQueueThread; |
| i = pthread_create(&KQueueThread, NULL, KQueueLoop, &mDNSStorage); |
| if (i == -1) { LogMsg("pthread_create() failed errno %d (%s)", errno, strerror(errno)); status = errno; goto exit; } |
| if (status == 0) |
| { |
| CFRunLoopRun(); |
| LogMsg("ERROR: CFRunLoopRun Exiting."); |
| mDNS_Close(&mDNSStorage); |
| } |
| #endif // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| |
| LogMsg("%s exiting", mDNSResponderVersionString); |
| |
| exit: |
| if (!mDNS_DebugMode && !started_via_launchdaemon) destroyBootstrapService(); |
| return(status); |
| } |
| |
| // uds_daemon.c support routines ///////////////////////////////////////////// |
| |
| // Arrange things so that when data appears on fd, callback is called with context |
| mDNSexport mStatus udsSupportAddFDToEventLoop(int fd, udsEventCallback callback, void *context, void **platform_data) |
| { |
| KQSocketEventSource **p = &gEventSources; |
| (void) platform_data; |
| while (*p && (*p)->fd != fd) p = &(*p)->next; |
| if (*p) { LogMsg("udsSupportAddFDToEventLoop: ERROR fd %d already has EventLoop source entry", fd); return mStatus_AlreadyRegistered; } |
| |
| KQSocketEventSource *newSource = (KQSocketEventSource*) mallocL("KQSocketEventSource", sizeof *newSource); |
| if (!newSource) return mStatus_NoMemoryErr; |
| |
| newSource->next = mDNSNULL; |
| newSource->fd = fd; |
| newSource->kqs.KQcallback = callback; |
| newSource->kqs.KQcontext = context; |
| newSource->kqs.KQtask = "UDS client"; |
| #ifdef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| newSource->kqs.readSource = mDNSNULL; |
| newSource->kqs.writeSource = mDNSNULL; |
| newSource->kqs.fdClosed = mDNSfalse; |
| #endif // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM |
| |
| if (KQueueSet(fd, EV_ADD, EVFILT_READ, &newSource->kqs) == 0) |
| { |
| *p = newSource; |
| return mStatus_NoError; |
| } |
| |
| LogMsg("KQueueSet failed for fd %d errno %d (%s)", fd, errno, strerror(errno)); |
| freeL("KQSocketEventSource", newSource); |
| return mStatus_BadParamErr; |
| } |
| |
| int udsSupportReadFD(dnssd_sock_t fd, char *buf, int len, int flags, void *platform_data) |
| { |
| (void) platform_data; |
| return recv(fd, buf, len, flags); |
| } |
| |
| mDNSexport mStatus udsSupportRemoveFDFromEventLoop(int fd, void *platform_data) // Note: This also CLOSES the file descriptor |
| { |
| KQSocketEventSource **p = &gEventSources; |
| (void) platform_data; |
| while (*p && (*p)->fd != fd) p = &(*p)->next; |
| if (*p) |
| { |
| KQSocketEventSource *s = *p; |
| *p = (*p)->next; |
| // We don't have to explicitly do a kqueue EV_DELETE here because closing the fd |
| // causes the kernel to automatically remove any associated kevents |
| mDNSPlatformCloseFD(&s->kqs, s->fd); |
| freeL("KQSocketEventSource", s); |
| return mStatus_NoError; |
| } |
| LogMsg("udsSupportRemoveFDFromEventLoop: ERROR fd %d not found in EventLoop source list", fd); |
| return mStatus_NoSuchNameErr; |
| } |
| |
| #if _BUILDING_XCODE_PROJECT_ |
| // If mDNSResponder crashes, then this string will be magically included in the automatically-generated crash log |
| const char *__crashreporter_info__ = mDNSResponderVersionString; |
| asm (".desc ___crashreporter_info__, 0x10"); |
| #endif |
| |
| // For convenience when using the "strings" command, this is the last thing in the file |
| // The "@(#) " pattern is a special prefix the "what" command looks for |
| mDNSexport const char mDNSResponderVersionString_SCCS[] = "@(#) mDNSResponder " STRINGIFY(mDNSResponderVersion) " (" __DATE__ " " __TIME__ ")"; |