/* -*- Mode: C; tab-width: 4 -*- * * Copyright (c) 2003-2006 Apple Computer, Inc. All rights reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #if defined(_WIN32) #include #define usleep(X) Sleep(((X)+999)/1000) #else #include #include #include #include #include #include #endif #include #include #include "mDNSEmbeddedAPI.h" #include "DNSCommon.h" #include "uDNS.h" #include "uds_daemon.h" #ifdef __ANDROID__ #include "cutils/sockets.h" #endif // Normally we append search domains only for queries with a single label that are not // fully qualified. This can be overridden to apply search domains for queries (that are // not fully qualified) with any number of labels e.g., moon, moon.cs, moon.cs.be, etc. mDNSBool AlwaysAppendSearchDomains = mDNSfalse; // Apple-specific functionality, not required for other platforms #if APPLE_OSX_mDNSResponder #include #ifndef PID_FILE #define PID_FILE "" #endif #endif #if APPLE_OSX_mDNSResponder #include #if ! NO_WCF int WCFIsServerRunning(WCFConnection *conn) __attribute__((weak_import)); int WCFNameResolvesToAddr(WCFConnection *conn, char* domainName, struct sockaddr* address, uid_t userid) __attribute__((weak_import)); int WCFNameResolvesToName(WCFConnection *conn, char* fromName, char* toName, uid_t userid) __attribute__((weak_import)); // Do we really need to define a macro for "if"? #define CHECK_WCF_FUNCTION(X) if (X) #endif // ! NO_WCF #else #define NO_WCF 1 #endif // APPLE_OSX_mDNSResponder // User IDs 0-500 are system-wide processes, not actual users in the usual sense // User IDs for real user accounts start at 501 and count up from there #define SystemUID(X) ((X) <= 500) // *************************************************************************** #if COMPILER_LIKES_PRAGMA_MARK #pragma mark - #pragma mark - Types and Data Structures #endif typedef enum { t_uninitialized, t_morecoming, t_complete, t_error, t_terminated } transfer_state; typedef struct request_state request_state; typedef void (*req_termination_fn)(request_state *request); typedef struct registered_record_entry { struct registered_record_entry *next; mDNSu32 key; client_context_t regrec_client_context; request_state *request; mDNSBool external_advertise; mDNSInterfaceID origInterfaceID; AuthRecord *rr; // Pointer to variable-sized AuthRecord (Why a pointer? Why not just embed it here?) } registered_record_entry; // A single registered service: ServiceRecordSet + bookkeeping // Note that we duplicate some fields from parent service_info object // to facilitate cleanup, when instances and parent may be deallocated at different times. typedef struct service_instance { struct service_instance *next; request_state *request; AuthRecord *subtypes; mDNSBool renameonmemfree; // Set on config change when we deregister original name mDNSBool clientnotified; // Has client been notified of successful registration yet? mDNSBool default_local; // is this the "local." from an empty-string registration? mDNSBool external_advertise; // is this is being advertised externally? domainname domain; ServiceRecordSet srs; // note -- variable-sized object -- must be last field in struct } service_instance; // for multi-domain default browsing typedef struct browser_t { struct browser_t *next; domainname domain; DNSQuestion q; } browser_t; struct request_state { request_state *next; request_state *primary; // If this operation is on a shared socket, pointer to primary // request_state for the original DNSServiceCreateConnection() operation dnssd_sock_t sd; dnssd_sock_t errsd; mDNSu32 uid; void * platform_data; // Note: On a shared connection these fields in the primary structure, including hdr, are re-used // for each new request. This is because, until we've read the ipc_msg_hdr to find out what the // operation is, we don't know if we're going to need to allocate a new request_state or not. transfer_state ts; mDNSu32 hdr_bytes; // bytes of header already read ipc_msg_hdr hdr; mDNSu32 data_bytes; // bytes of message data already read char *msgbuf; // pointer to data storage to pass to free() const char *msgptr; // pointer to data to be read from (may be modified) char *msgend; // pointer to byte after last byte of message // reply, termination, error, and client context info int no_reply; // don't send asynchronous replies to client mDNSs32 time_blocked; // record time of a blocked client int unresponsiveness_reports; struct reply_state *replies; // corresponding (active) reply list req_termination_fn terminate; DNSServiceFlags flags; union { registered_record_entry *reg_recs; // list of registrations for a connection-oriented request struct { mDNSInterfaceID interface_id; mDNSBool default_domain; mDNSBool ForceMCast; domainname regtype; browser_t *browsers; } browser; struct { mDNSInterfaceID InterfaceID; mDNSu16 txtlen; void *txtdata; mDNSIPPort port; domainlabel name; char type_as_string[MAX_ESCAPED_DOMAIN_NAME]; domainname type; mDNSBool default_domain; domainname host; mDNSBool autoname; // Set if this name is tied to the Computer Name mDNSBool autorename; // Set if this client wants us to automatically rename on conflict mDNSBool allowremotequery; // Respond to unicast queries from outside the local link? int num_subtypes; service_instance *instances; } servicereg; struct { mDNSInterfaceID interface_id; mDNSu32 flags; mDNSu32 protocol; DNSQuestion q4; DNSQuestion *q42; DNSQuestion q6; DNSQuestion *q62; } addrinfo; struct { mDNSIPPort ReqExt; // External port we originally requested, for logging purposes NATTraversalInfo NATinfo; } pm; struct { #if 0 DNSServiceFlags flags; #endif DNSQuestion q_all; DNSQuestion q_default; } enumeration; struct { DNSQuestion q; DNSQuestion *q2; } queryrecord; struct { DNSQuestion qtxt; DNSQuestion qsrv; const ResourceRecord *txt; const ResourceRecord *srv; mDNSs32 ReportTime; mDNSBool external_advertise; } resolve; } u; }; // struct physically sits between ipc message header and call-specific fields in the message buffer typedef struct { DNSServiceFlags flags; // Note: This field is in NETWORK byte order mDNSu32 ifi; // Note: This field is in NETWORK byte order DNSServiceErrorType error; // Note: This field is in NETWORK byte order } reply_hdr; typedef struct reply_state { struct reply_state *next; // If there are multiple unsent replies mDNSu32 totallen; mDNSu32 nwriten; ipc_msg_hdr mhdr[1]; reply_hdr rhdr[1]; } reply_state; // *************************************************************************** #if COMPILER_LIKES_PRAGMA_MARK #pragma mark - #pragma mark - Globals #endif // globals mDNSexport mDNS mDNSStorage; mDNSexport const char ProgramName[] = "mDNSResponder"; static dnssd_sock_t listenfd = dnssd_InvalidSocket; static request_state *all_requests = NULL; // Note asymmetry here between registration and browsing. // For service registrations we only automatically register in domains that explicitly appear in local configuration data // (so AutoRegistrationDomains could equally well be called SCPrefRegDomains) // For service browsing we also learn automatic browsing domains from the network, so for that case we have: // 1. SCPrefBrowseDomains (local configuration data) // 2. LocalDomainEnumRecords (locally-generated local-only PTR records -- equivalent to slElem->AuthRecs in uDNS.c) // 3. AutoBrowseDomains, which is populated by tracking add/rmv events in AutomaticBrowseDomainChange, the callback function for our mDNS_GetDomains call. // By creating and removing our own LocalDomainEnumRecords, we trigger AutomaticBrowseDomainChange callbacks just like domains learned from the network would. mDNSexport DNameListElem *AutoRegistrationDomains; // Domains where we automatically register for empty-string registrations static DNameListElem *SCPrefBrowseDomains; // List of automatic browsing domains read from SCPreferences for "empty string" browsing static ARListElem *LocalDomainEnumRecords; // List of locally-generated PTR records to augment those we learn from the network mDNSexport DNameListElem *AutoBrowseDomains; // List created from those local-only PTR records plus records we get from the network #define MSG_PAD_BYTES 5 // pad message buffer (read from client) with n zero'd bytes to guarantee // n get_string() calls w/o buffer overrun // initialization, setup/teardown functions // If a platform specifies its own PID file name, we use that #ifndef PID_FILE #define PID_FILE "/var/run/mDNSResponder.pid" #endif // *************************************************************************** #if COMPILER_LIKES_PRAGMA_MARK #pragma mark - #pragma mark - General Utility Functions #endif mDNSlocal void FatalError(char *errmsg) { LogMsg("%s: %s", errmsg, dnssd_strerror(dnssd_errno)); *(volatile long*)0 = 0; // On OS X abort() doesn't generate a crash log, but writing to zero does abort(); // On platforms where writing to zero doesn't generate an exception, abort instead } mDNSlocal mDNSu32 dnssd_htonl(mDNSu32 l) { mDNSu32 ret; char *data = (char*) &ret; put_uint32(l, &data); return ret; } // hack to search-replace perror's to LogMsg's mDNSlocal void my_perror(char *errmsg) { LogMsg("%s: %d (%s)", errmsg, dnssd_errno, dnssd_strerror(dnssd_errno)); } mDNSlocal void abort_request(request_state *req) { if (req->terminate == (req_termination_fn)~0) { LogMsg("abort_request: ERROR: Attempt to abort operation %p with req->terminate %p", req, req->terminate); return; } // First stop whatever mDNSCore operation we were doing // If this is actually a shared connection operation, then its req->terminate function will scan // the all_requests list and terminate any subbordinate operations sharing this file descriptor if (req->terminate) req->terminate(req); if (!dnssd_SocketValid(req->sd)) { LogMsg("abort_request: ERROR: Attempt to abort operation %p with invalid fd %d", req, req->sd); return; } // Now, if this request_state is not subordinate to some other primary, close file descriptor and discard replies if (!req->primary) { if (req->errsd != req->sd) LogOperation("%3d: Removing FD and closing errsd %d", req->sd, req->errsd); else LogOperation("%3d: Removing FD", req->sd); udsSupportRemoveFDFromEventLoop(req->sd, req->platform_data); // Note: This also closes file descriptor req->sd for us if (req->errsd != req->sd) { dnssd_close(req->errsd); req->errsd = req->sd; } while (req->replies) // free pending replies { reply_state *ptr = req->replies; req->replies = req->replies->next; freeL("reply_state (abort)", ptr); } } // Set req->sd to something invalid, so that udsserver_idle knows to unlink and free this structure #if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING // Don't use dnssd_InvalidSocket (-1) because that's the sentinel value MACOSX_MDNS_MALLOC_DEBUGGING uses // for detecting when the memory for an object is inadvertently freed while the object is still on some list req->sd = req->errsd = -2; #else req->sd = req->errsd = dnssd_InvalidSocket; #endif // We also set req->terminate to a bogus value so we know if abort_request() gets called again for this request req->terminate = (req_termination_fn)~0; } mDNSlocal void AbortUnlinkAndFree(request_state *req) { request_state **p = &all_requests; abort_request(req); while (*p && *p != req) p=&(*p)->next; if (*p) { *p = req->next; freeL("request_state/AbortUnlinkAndFree", req); } else LogMsg("AbortUnlinkAndFree: ERROR: Attempt to abort operation %p not in list", req); } mDNSlocal reply_state *create_reply(const reply_op_t op, const size_t datalen, request_state *const request) { reply_state *reply; if ((unsigned)datalen < sizeof(reply_hdr)) { LogMsg("ERROR: create_reply - data length less than length of required fields"); return NULL; } reply = mallocL("reply_state", sizeof(reply_state) + datalen - sizeof(reply_hdr)); if (!reply) FatalError("ERROR: malloc"); reply->next = mDNSNULL; reply->totallen = (mDNSu32)datalen + sizeof(ipc_msg_hdr); reply->nwriten = 0; reply->mhdr->version = VERSION; reply->mhdr->datalen = (mDNSu32)datalen; reply->mhdr->ipc_flags = 0; reply->mhdr->op = op; reply->mhdr->client_context = request->hdr.client_context; reply->mhdr->reg_index = 0; return reply; } // Append a reply to the list in a request object // If our request is sharing a connection, then we append our reply_state onto the primary's list mDNSlocal void append_reply(request_state *req, reply_state *rep) { request_state *r = req->primary ? req->primary : req; reply_state **ptr = &r->replies; while (*ptr) ptr = &(*ptr)->next; *ptr = rep; rep->next = NULL; } // Generates a response message giving name, type, domain, plus interface index, // suitable for a browse result or service registration result. // On successful completion rep is set to point to a malloc'd reply_state struct mDNSlocal mStatus GenerateNTDResponse(const domainname *const servicename, const mDNSInterfaceID id, request_state *const request, reply_state **const rep, reply_op_t op, DNSServiceFlags flags, mStatus err) { domainlabel name; domainname type, dom; *rep = NULL; if (!DeconstructServiceName(servicename, &name, &type, &dom)) return kDNSServiceErr_Invalid; else { char namestr[MAX_DOMAIN_LABEL+1]; char typestr[MAX_ESCAPED_DOMAIN_NAME]; char domstr [MAX_ESCAPED_DOMAIN_NAME]; int len; char *data; ConvertDomainLabelToCString_unescaped(&name, namestr); ConvertDomainNameToCString(&type, typestr); ConvertDomainNameToCString(&dom, domstr); // Calculate reply data length len = sizeof(DNSServiceFlags); len += sizeof(mDNSu32); // if index len += sizeof(DNSServiceErrorType); len += (int) (strlen(namestr) + 1); len += (int) (strlen(typestr) + 1); len += (int) (strlen(domstr) + 1); // Build reply header *rep = create_reply(op, len, request); (*rep)->rhdr->flags = dnssd_htonl(flags); (*rep)->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(&mDNSStorage, id, mDNSfalse)); (*rep)->rhdr->error = dnssd_htonl(err); // Build reply body data = (char *)&(*rep)->rhdr[1]; put_string(namestr, &data); put_string(typestr, &data); put_string(domstr, &data); return mStatus_NoError; } } // Special support to enable the DNSServiceBrowse call made by Bonjour Browser // Remove after Bonjour Browser is updated to use DNSServiceQueryRecord instead of DNSServiceBrowse mDNSlocal void GenerateBonjourBrowserResponse(const domainname *const servicename, const mDNSInterfaceID id, request_state *const request, reply_state **const rep, reply_op_t op, DNSServiceFlags flags, mStatus err) { char namestr[MAX_DOMAIN_LABEL+1]; char typestr[MAX_ESCAPED_DOMAIN_NAME]; static const char domstr[] = "."; int len; char *data; *rep = NULL; // 1. Put first label in namestr ConvertDomainLabelToCString_unescaped((const domainlabel *)servicename, namestr); // 2. Put second label and "local" into typestr mDNS_snprintf(typestr, sizeof(typestr), "%#s.local.", SecondLabel(servicename)); // Calculate reply data length len = sizeof(DNSServiceFlags); len += sizeof(mDNSu32); // if index len += sizeof(DNSServiceErrorType); len += (int) (strlen(namestr) + 1); len += (int) (strlen(typestr) + 1); len += (int) (strlen(domstr) + 1); // Build reply header *rep = create_reply(op, len, request); (*rep)->rhdr->flags = dnssd_htonl(flags); (*rep)->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(&mDNSStorage, id, mDNSfalse)); (*rep)->rhdr->error = dnssd_htonl(err); // Build reply body data = (char *)&(*rep)->rhdr[1]; put_string(namestr, &data); put_string(typestr, &data); put_string(domstr, &data); } // Returns a resource record (allocated w/ malloc) containing the data found in an IPC message // Data must be in the following format: flags, interfaceIndex, name, rrtype, rrclass, rdlen, rdata, (optional) ttl // (ttl only extracted/set if ttl argument is non-zero). Returns NULL for a bad-parameter error mDNSlocal AuthRecord *read_rr_from_ipc_msg(request_state *request, int GetTTL, int validate_flags) { DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend); mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend); char name[256]; int str_err = get_string(&request->msgptr, request->msgend, name, sizeof(name)); mDNSu16 type = get_uint16(&request->msgptr, request->msgend); mDNSu16 class = get_uint16(&request->msgptr, request->msgend); mDNSu16 rdlen = get_uint16(&request->msgptr, request->msgend); const char *rdata = get_rdata (&request->msgptr, request->msgend, rdlen); mDNSu32 ttl = GetTTL ? get_uint32(&request->msgptr, request->msgend) : 0; int storage_size = rdlen > sizeof(RDataBody) ? rdlen : sizeof(RDataBody); AuthRecord *rr; mDNSInterfaceID InterfaceID; AuthRecType artype; request->flags = flags; if (str_err) { LogMsg("ERROR: read_rr_from_ipc_msg - get_string"); return NULL; } if (!request->msgptr) { LogMsg("Error reading Resource Record from client"); return NULL; } if (validate_flags && !((flags & kDNSServiceFlagsShared) == kDNSServiceFlagsShared) && !((flags & kDNSServiceFlagsUnique) == kDNSServiceFlagsUnique)) { LogMsg("ERROR: Bad resource record flags (must be kDNSServiceFlagsShared or kDNSServiceFlagsUnique)"); return NULL; } rr = mallocL("AuthRecord/read_rr_from_ipc_msg", sizeof(AuthRecord) - sizeof(RDataBody) + storage_size); if (!rr) FatalError("ERROR: malloc"); InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex); if (InterfaceID == mDNSInterface_LocalOnly) artype = AuthRecordLocalOnly; else if (InterfaceID == mDNSInterface_P2P) artype = AuthRecordP2P; else if ((InterfaceID == mDNSInterface_Any) && (flags & kDNSServiceFlagsIncludeP2P)) artype = AuthRecordAnyIncludeP2P; else artype = AuthRecordAny; mDNS_SetupResourceRecord(rr, mDNSNULL, InterfaceID, type, 0, (mDNSu8) ((flags & kDNSServiceFlagsShared) ? kDNSRecordTypeShared : kDNSRecordTypeUnique), artype, mDNSNULL, mDNSNULL); if (!MakeDomainNameFromDNSNameString(&rr->namestorage, name)) { LogMsg("ERROR: bad name: %s", name); freeL("AuthRecord/read_rr_from_ipc_msg", rr); return NULL; } if (flags & kDNSServiceFlagsAllowRemoteQuery) rr->AllowRemoteQuery = mDNStrue; rr->resrec.rrclass = class; rr->resrec.rdlength = rdlen; rr->resrec.rdata->MaxRDLength = rdlen; mDNSPlatformMemCopy(rr->resrec.rdata->u.data, rdata, rdlen); if (GetTTL) rr->resrec.rroriginalttl = ttl; rr->resrec.namehash = DomainNameHashValue(rr->resrec.name); SetNewRData(&rr->resrec, mDNSNULL, 0); // Sets rr->rdatahash for us return rr; } mDNSlocal int build_domainname_from_strings(domainname *srv, char *name, char *regtype, char *domain) { domainlabel n; domainname d, t; if (!MakeDomainLabelFromLiteralString(&n, name)) return -1; if (!MakeDomainNameFromDNSNameString(&t, regtype)) return -1; if (!MakeDomainNameFromDNSNameString(&d, domain)) return -1; if (!ConstructServiceName(srv, &n, &t, &d)) return -1; return 0; } mDNSlocal void send_all(dnssd_sock_t s, const char *ptr, int len) { int n = send(s, ptr, len, 0); // On a freshly-created Unix Domain Socket, the kernel should *never* fail to buffer a small write for us // (four bytes for a typical error code return, 12 bytes for DNSServiceGetProperty(DaemonVersion)). // If it does fail, we don't attempt to handle this failure, but we do log it so we know something is wrong. if (n < len) LogMsg("ERROR: send_all(%d) wrote %d of %d errno %d (%s)", s, n, len, dnssd_errno, dnssd_strerror(dnssd_errno)); } #if 0 mDNSlocal mDNSBool AuthorizedDomain(const request_state * const request, const domainname * const d, const DNameListElem * const doms) { const DNameListElem *delem = mDNSNULL; int bestDelta = -1; // the delta of the best match, lower is better int dLabels = 0; mDNSBool allow = mDNSfalse; if (SystemUID(request->uid)) return mDNStrue; dLabels = CountLabels(d); for (delem = doms; delem; delem = delem->next) { if (delem->uid) { int delemLabels = CountLabels(&delem->name); int delta = dLabels - delemLabels; if ((bestDelta == -1 || delta <= bestDelta) && SameDomainName(&delem->name, SkipLeadingLabels(d, delta))) { bestDelta = delta; allow = (allow || (delem->uid == request->uid)); } } } return bestDelta == -1 ? mDNStrue : allow; } #endif // *************************************************************************** #if COMPILER_LIKES_PRAGMA_MARK #pragma mark - #pragma mark - external helpers #endif mDNSlocal void external_start_advertising_helper(service_instance *const instance) { AuthRecord *st = instance->subtypes; ExtraResourceRecord *e; int i; if (mDNSIPPortIsZero(instance->request->u.servicereg.port)) { LogInfo("external_start_advertising_helper: Not registering service with port number zero"); return; } #if APPLE_OSX_mDNSResponder // Update packet filter if p2p interface already exists, otherwise, // if will be updated when we get the KEV_DL_IF_ATTACHED event for // the interface. Called here since we don't call external_start_advertising_service() // with the SRV record when advertising a service. mDNSInitPacketFilter(); #endif // APPLE_OSX_mDNSResponder if (instance->external_advertise) LogMsg("external_start_advertising_helper: external_advertise already set!"); for ( i = 0; i < instance->request->u.servicereg.num_subtypes; i++) external_start_advertising_service(&st[i].resrec); external_start_advertising_service(&instance->srs.RR_PTR.resrec); external_start_advertising_service(&instance->srs.RR_TXT.resrec); for (e = instance->srs.Extras; e; e = e->next) external_start_advertising_service(&e->r.resrec); instance->external_advertise = mDNStrue; } mDNSlocal void external_stop_advertising_helper(service_instance *const instance) { AuthRecord *st = instance->subtypes; ExtraResourceRecord *e; int i; if (!instance->external_advertise) return; LogInfo("external_stop_advertising_helper: calling external_stop_advertising_service"); for ( i = 0; i < instance->request->u.servicereg.num_subtypes; i++) external_stop_advertising_service(&st[i].resrec); external_stop_advertising_service(&instance->srs.RR_PTR.resrec); external_stop_advertising_service(&instance->srs.RR_TXT.resrec); for (e = instance->srs.Extras; e; e = e->next) external_stop_advertising_service(&e->r.resrec); instance->external_advertise = mDNSfalse; } // *************************************************************************** #if COMPILER_LIKES_PRAGMA_MARK #pragma mark - #pragma mark - DNSServiceRegister #endif mDNSexport void FreeExtraRR(mDNS *const m, AuthRecord *const rr, mStatus result) { ExtraResourceRecord *extra = (ExtraResourceRecord *)rr->RecordContext; (void)m; // Unused if (result != mStatus_MemFree) { LogMsg("Error: FreeExtraRR invoked with unexpected error %d", result); return; } LogInfo(" FreeExtraRR %s", RRDisplayString(m, &rr->resrec)); if (rr->resrec.rdata != &rr->rdatastorage) freeL("Extra RData", rr->resrec.rdata); freeL("ExtraResourceRecord/FreeExtraRR", extra); } mDNSlocal void unlink_and_free_service_instance(service_instance *srv) { ExtraResourceRecord *e = srv->srs.Extras, *tmp; external_stop_advertising_helper(srv); // clear pointers from parent struct if (srv->request) { service_instance **p = &srv->request->u.servicereg.instances; while (*p) { if (*p == srv) { *p = (*p)->next; break; } p = &(*p)->next; } } while (e) { e->r.RecordContext = e; tmp = e; e = e->next; FreeExtraRR(&mDNSStorage, &tmp->r, mStatus_MemFree); } if (srv->srs.RR_TXT.resrec.rdata != &srv->srs.RR_TXT.rdatastorage) freeL("TXT RData", srv->srs.RR_TXT.resrec.rdata); if (srv->subtypes) { freeL("ServiceSubTypes", srv->subtypes); srv->subtypes = NULL; } freeL("service_instance", srv); } // Count how many other service records we have locally with the same name, but different rdata. // For auto-named services, we can have at most one per machine -- if we allowed two auto-named services of // the same type on the same machine, we'd get into an infinite autoimmune-response loop of continuous renaming. mDNSexport int CountPeerRegistrations(mDNS *const m, ServiceRecordSet *const srs) { int count = 0; ResourceRecord *r = &srs->RR_SRV.resrec; AuthRecord *rr; for (rr = m->ResourceRecords; rr; rr=rr->next) if (rr->resrec.rrtype == kDNSType_SRV && SameDomainName(rr->resrec.name, r->name) && !IdenticalSameNameRecord(&rr->resrec, r)) count++; verbosedebugf("%d peer registrations for %##s", count, r->name->c); return(count); } mDNSexport int CountExistingRegistrations(domainname *srv, mDNSIPPort port) { int count = 0; AuthRecord *rr; for (rr = mDNSStorage.ResourceRecords; rr; rr=rr->next) if (rr->resrec.rrtype == kDNSType_SRV && mDNSSameIPPort(rr->resrec.rdata->u.srv.port, port) && SameDomainName(rr->resrec.name, srv)) count++; return(count); } mDNSlocal void SendServiceRemovalNotification(ServiceRecordSet *const srs) { reply_state *rep; service_instance *instance = srs->ServiceContext; if (GenerateNTDResponse(srs->RR_SRV.resrec.name, srs->RR_SRV.resrec.InterfaceID, instance->request, &rep, reg_service_reply_op, 0, mStatus_NoError) != mStatus_NoError) LogMsg("%3d: SendServiceRemovalNotification: %##s is not valid DNS-SD SRV name", instance->request->sd, srs->RR_SRV.resrec.name->c); else { append_reply(instance->request, rep); instance->clientnotified = mDNSfalse; } } // service registration callback performs three duties - frees memory for deregistered services, // handles name conflicts, and delivers completed registration information to the client mDNSlocal void regservice_callback(mDNS *const m, ServiceRecordSet *const srs, mStatus result) { mStatus err; mDNSBool SuppressError = mDNSfalse; service_instance *instance; reply_state *rep; (void)m; // Unused if (!srs) { LogMsg("regservice_callback: srs is NULL %d", result); return; } instance = srs->ServiceContext; if (!instance) { LogMsg("regservice_callback: srs->ServiceContext is NULL %d", result); return; } // don't send errors up to client for wide-area, empty-string registrations if (instance->request && instance->request->u.servicereg.default_domain && !instance->default_local) SuppressError = mDNStrue; if (mDNS_LoggingEnabled) { const char *const fmt = (result == mStatus_NoError) ? "%s DNSServiceRegister(%##s, %u) REGISTERED" : (result == mStatus_MemFree) ? "%s DNSServiceRegister(%##s, %u) DEREGISTERED" : (result == mStatus_NameConflict) ? "%s DNSServiceRegister(%##s, %u) NAME CONFLICT" : "%s DNSServiceRegister(%##s, %u) %s %d"; char prefix[16] = "---:"; if (instance->request) mDNS_snprintf(prefix, sizeof(prefix), "%3d:", instance->request->sd); LogOperation(fmt, prefix, srs->RR_SRV.resrec.name->c, mDNSVal16(srs->RR_SRV.resrec.rdata->u.srv.port), SuppressError ? "suppressed error" : "CALLBACK", result); } if (!instance->request && result != mStatus_MemFree) { LogMsg("regservice_callback: instance->request is NULL %d", result); return; } if (result == mStatus_NoError) { if (instance->request->u.servicereg.allowremotequery) { ExtraResourceRecord *e; srs->RR_ADV.AllowRemoteQuery = mDNStrue; srs->RR_PTR.AllowRemoteQuery = mDNStrue; srs->RR_SRV.AllowRemoteQuery = mDNStrue; srs->RR_TXT.AllowRemoteQuery = mDNStrue; for (e = instance->srs.Extras; e; e = e->next) e->r.AllowRemoteQuery = mDNStrue; } if (GenerateNTDResponse(srs->RR_SRV.resrec.name, srs->RR_SRV.resrec.InterfaceID, instance->request, &rep, reg_service_reply_op, kDNSServiceFlagsAdd, result) != mStatus_NoError) LogMsg("%3d: regservice_callback: %##s is not valid DNS-SD SRV name", instance->request->sd, srs->RR_SRV.resrec.name->c); else { append_reply(instance->request, rep); instance->clientnotified = mDNStrue; } if (instance->request->u.servicereg.InterfaceID == mDNSInterface_P2P || (!instance->request->u.servicereg.InterfaceID && SameDomainName(&instance->domain, &localdomain) && (instance->request->flags & kDNSServiceFlagsIncludeP2P))) { LogInfo("regservice_callback: calling external_start_advertising_helper()"); external_start_advertising_helper(instance); } if (instance->request->u.servicereg.autoname && CountPeerRegistrations(m, srs) == 0) RecordUpdatedNiceLabel(m, 0); // Successfully got new name, tell user immediately } else if (result == mStatus_MemFree) { if (instance->request && instance->renameonmemfree) { external_stop_advertising_helper(instance); instance->renameonmemfree = 0; err = mDNS_RenameAndReregisterService(m, srs, &instance->request->u.servicereg.name); if (err) LogMsg("ERROR: regservice_callback - RenameAndReregisterService returned %d", err); // error should never happen - safest to log and continue } else unlink_and_free_service_instance(instance); } else if (result == mStatus_NameConflict) { if (instance->request->u.servicereg.autorename) { external_stop_advertising_helper(instance); if (instance->request->u.servicereg.autoname && CountPeerRegistrations(m, srs) == 0) { // On conflict for an autoname service, rename and reregister *all* autoname services IncrementLabelSuffix(&m->nicelabel, mDNStrue); mDNS_ConfigChanged(m); // Will call back into udsserver_handle_configchange() } else // On conflict for a non-autoname service, rename and reregister just that one service { if (instance->clientnotified) SendServiceRemovalNotification(srs); mDNS_RenameAndReregisterService(m, srs, mDNSNULL); } } else { if (!SuppressError) { if (GenerateNTDResponse(srs->RR_SRV.resrec.name, srs->RR_SRV.resrec.InterfaceID, instance->request, &rep, reg_service_reply_op, kDNSServiceFlagsAdd, result) != mStatus_NoError) LogMsg("%3d: regservice_callback: %##s is not valid DNS-SD SRV name", instance->request->sd, srs->RR_SRV.resrec.name->c); else { append_reply(instance->request, rep); instance->clientnotified = mDNStrue; } } unlink_and_free_service_instance(instance); } } else // Not mStatus_NoError, mStatus_MemFree, or mStatus_NameConflict { if (!SuppressError) { if (GenerateNTDResponse(srs->RR_SRV.resrec.name, srs->RR_SRV.resrec.InterfaceID, instance->request, &rep, reg_service_reply_op, kDNSServiceFlagsAdd, result) != mStatus_NoError) LogMsg("%3d: regservice_callback: %##s is not valid DNS-SD SRV name", instance->request->sd, srs->RR_SRV.resrec.name->c); else { append_reply(instance->request, rep); instance->clientnotified = mDNStrue; } } } } mDNSlocal void regrecord_callback(mDNS *const m, AuthRecord *rr, mStatus result) { (void)m; // Unused if (!rr->RecordContext) // parent struct already freed by termination callback { if (result == mStatus_NoError) LogMsg("Error: regrecord_callback: successful registration of orphaned record %s", ARDisplayString(m, rr)); else { if (result != mStatus_MemFree) LogMsg("regrecord_callback: error %d received after parent termination", result); // We come here when the record is being deregistered either from DNSServiceRemoveRecord or connection_termination. // If the record has been updated, we need to free the rdata. Everytime we call mDNS_Update, it calls update_callback // with the old rdata (so that we can free it) and stores the new rdata in "rr->resrec.rdata". This means, we need // to free the latest rdata for which the update_callback was never called with. if (rr->resrec.rdata != &rr->rdatastorage) freeL("RData/regrecord_callback", rr->resrec.rdata); freeL("AuthRecord/regrecord_callback", rr); } } else { registered_record_entry *re = rr->RecordContext; request_state *request = re->request; if (mDNS_LoggingEnabled) { char *fmt = (result == mStatus_NoError) ? "%3d: DNSServiceRegisterRecord(%u %s) REGISTERED" : (result == mStatus_MemFree) ? "%3d: DNSServiceRegisterRecord(%u %s) DEREGISTERED" : (result == mStatus_NameConflict) ? "%3d: DNSServiceRegisterRecord(%u %s) NAME CONFLICT" : "%3d: DNSServiceRegisterRecord(%u %s) %d"; LogOperation(fmt, request->sd, re->key, RRDisplayString(m, &rr->resrec), result); } if (result != mStatus_MemFree) { int len = sizeof(DNSServiceFlags) + sizeof(mDNSu32) + sizeof(DNSServiceErrorType); reply_state *reply = create_reply(reg_record_reply_op, len, request); reply->mhdr->client_context = re->regrec_client_context; reply->rhdr->flags = dnssd_htonl(0); reply->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(m, rr->resrec.InterfaceID, mDNSfalse)); reply->rhdr->error = dnssd_htonl(result); append_reply(request, reply); } if (result) { // unlink from list, free memory registered_record_entry **ptr = &request->u.reg_recs; while (*ptr && (*ptr) != re) ptr = &(*ptr)->next; if (!*ptr) { LogMsg("regrecord_callback - record not in list!"); return; } *ptr = (*ptr)->next; freeL("registered_record_entry AuthRecord regrecord_callback", re->rr); freeL("registered_record_entry regrecord_callback", re); } else { if (re->external_advertise) LogMsg("regrecord_callback: external_advertise already set!"); if (re->origInterfaceID == mDNSInterface_P2P || (!re->origInterfaceID && IsLocalDomain(&rr->namestorage) && (request->flags & kDNSServiceFlagsIncludeP2P))) { LogInfo("regrecord_callback: calling external_start_advertising_service"); external_start_advertising_service(&rr->resrec); re->external_advertise = mDNStrue; } } } } mDNSlocal void connection_termination(request_state *request) { // When terminating a shared connection, we need to scan the all_requests list // and terminate any subbordinate operations sharing this file descriptor request_state **req = &all_requests; LogOperation("%3d: DNSServiceCreateConnection STOP", request->sd); while (*req) { if ((*req)->primary == request) { // Since we're already doing a list traversal, we unlink the request directly instead of using AbortUnlinkAndFree() request_state *tmp = *req; if (tmp->primary == tmp) LogMsg("connection_termination ERROR (*req)->primary == *req for %p %d", tmp, tmp->sd); if (tmp->replies) LogMsg("connection_termination ERROR How can subordinate req %p %d have replies queued?", tmp, tmp->sd); abort_request(tmp); *req = tmp->next; freeL("request_state/connection_termination", tmp); } else req = &(*req)->next; } while (request->u.reg_recs) { registered_record_entry *ptr = request->u.reg_recs; LogOperation("%3d: DNSServiceRegisterRecord(%u %s) STOP", request->sd, ptr->key, RRDisplayString(&mDNSStorage, &ptr->rr->resrec)); request->u.reg_recs = request->u.reg_recs->next; ptr->rr->RecordContext = NULL; if (ptr->external_advertise) { ptr->external_advertise = mDNSfalse; external_stop_advertising_service(&ptr->rr->resrec); } mDNS_Deregister(&mDNSStorage, ptr->rr); // Will free ptr->rr for us freeL("registered_record_entry/connection_termination", ptr); } } mDNSlocal void handle_cancel_request(request_state *request) { request_state **req = &all_requests; LogOperation("%3d: Cancel %08X %08X", request->sd, request->hdr.client_context.u32[1], request->hdr.client_context.u32[0]); while (*req) { if ((*req)->primary == request && (*req)->hdr.client_context.u32[0] == request->hdr.client_context.u32[0] && (*req)->hdr.client_context.u32[1] == request->hdr.client_context.u32[1]) { // Since we're already doing a list traversal, we unlink the request directly instead of using AbortUnlinkAndFree() request_state *tmp = *req; abort_request(tmp); *req = tmp->next; freeL("request_state/handle_cancel_request", tmp); } else req = &(*req)->next; } } mDNSlocal mStatus handle_regrecord_request(request_state *request) { mStatus err = mStatus_BadParamErr; AuthRecord *rr = read_rr_from_ipc_msg(request, 1, 1); if (rr) { registered_record_entry *re; // Don't allow non-local domains to be regsitered as LocalOnly. Allowing this would permit // clients to register records such as www.bigbank.com A w.x.y.z to redirect Safari. if (rr->resrec.InterfaceID == mDNSInterface_LocalOnly && !IsLocalDomain(rr->resrec.name) && rr->resrec.rrclass == kDNSClass_IN && (rr->resrec.rrtype == kDNSType_A || rr->resrec.rrtype == kDNSType_AAAA || rr->resrec.rrtype == kDNSType_CNAME)) { freeL("AuthRecord/handle_regrecord_request", rr); return (mStatus_BadParamErr); } // allocate registration entry, link into list re = mallocL("registered_record_entry", sizeof(registered_record_entry)); if (!re) FatalError("ERROR: malloc"); re->key = request->hdr.reg_index; re->rr = rr; re->regrec_client_context = request->hdr.client_context; re->request = request; re->external_advertise = mDNSfalse; rr->RecordContext = re; rr->RecordCallback = regrecord_callback; re->origInterfaceID = rr->resrec.InterfaceID; if (rr->resrec.InterfaceID == mDNSInterface_P2P) rr->resrec.InterfaceID = mDNSInterface_Any; #if 0 if (!AuthorizedDomain(request, rr->resrec.name, AutoRegistrationDomains)) return (mStatus_NoError); #endif if (rr->resrec.rroriginalttl == 0) rr->resrec.rroriginalttl = DefaultTTLforRRType(rr->resrec.rrtype); LogOperation("%3d: DNSServiceRegisterRecord(%u %s) START", request->sd, re->key, RRDisplayString(&mDNSStorage, &rr->resrec)); err = mDNS_Register(&mDNSStorage, rr); if (err) { LogOperation("%3d: DNSServiceRegisterRecord(%u %s) ERROR (%d)", request->sd, re->key, RRDisplayString(&mDNSStorage, &rr->resrec), err); freeL("registered_record_entry", re); freeL("registered_record_entry/AuthRecord", rr); } else { re->next = request->u.reg_recs; request->u.reg_recs = re; } } return(err); } mDNSlocal void UpdateDeviceInfoRecord(mDNS *const m); mDNSlocal void regservice_termination_callback(request_state *request) { if (!request) { LogMsg("regservice_termination_callback context is NULL"); return; } while (request->u.servicereg.instances) { service_instance *p = request->u.servicereg.instances; request->u.servicereg.instances = request->u.servicereg.instances->next; // only safe to free memory if registration is not valid, i.e. deregister fails (which invalidates p) LogOperation("%3d: DNSServiceRegister(%##s, %u) STOP", request->sd, p->srs.RR_SRV.resrec.name->c, mDNSVal16(p->srs.RR_SRV.resrec.rdata->u.srv.port)); external_stop_advertising_helper(p); // Clear backpointer *before* calling mDNS_DeregisterService/unlink_and_free_service_instance // We don't need unlink_and_free_service_instance to cut its element from the list, because we're already advancing // request->u.servicereg.instances as we work our way through the list, implicitly cutting one element at a time // We can't clear p->request *after* the calling mDNS_DeregisterService/unlink_and_free_service_instance // because by then we might have already freed p p->request = NULL; if (mDNS_DeregisterService(&mDNSStorage, &p->srs)) unlink_and_free_service_instance(p); // Don't touch service_instance *p after this -- it's likely to have been freed already } if (request->u.servicereg.txtdata) { freeL("service_info txtdata", request->u.servicereg.txtdata); request->u.servicereg.txtdata = NULL; } if (request->u.servicereg.autoname) { // Clear autoname before calling UpdateDeviceInfoRecord() so it doesn't mistakenly include this in its count of active autoname registrations request->u.servicereg.autoname = mDNSfalse; UpdateDeviceInfoRecord(&mDNSStorage); } } mDNSlocal request_state *LocateSubordinateRequest(request_state *request) { request_state *req; for (req = all_requests; req; req = req->next) if (req->primary == request && req->hdr.client_context.u32[0] == request->hdr.client_context.u32[0] && req->hdr.client_context.u32[1] == request->hdr.client_context.u32[1]) return(req); return(request); } mDNSlocal mStatus add_record_to_service(request_state *request, service_instance *instance, mDNSu16 rrtype, mDNSu16 rdlen, const char *rdata, mDNSu32 ttl) { ServiceRecordSet *srs = &instance->srs; mStatus result; int size = rdlen > sizeof(RDataBody) ? rdlen : sizeof(RDataBody); ExtraResourceRecord *extra = mallocL("ExtraResourceRecord", sizeof(*extra) - sizeof(RDataBody) + size); if (!extra) { my_perror("ERROR: malloc"); return mStatus_NoMemoryErr; } mDNSPlatformMemZero(extra, sizeof(ExtraResourceRecord)); // OK if oversized rdata not zero'd extra->r.resrec.rrtype = rrtype; extra->r.rdatastorage.MaxRDLength = (mDNSu16) size; extra->r.resrec.rdlength = rdlen; mDNSPlatformMemCopy(&extra->r.rdatastorage.u.data, rdata, rdlen); result = mDNS_AddRecordToService(&mDNSStorage, srs, extra, &extra->r.rdatastorage, ttl, (request->flags & kDNSServiceFlagsIncludeP2P) ? 1: 0); if (result) { freeL("ExtraResourceRecord/add_record_to_service", extra); return result; } extra->ClientID = request->hdr.reg_index; if (instance->external_advertise && (instance->request->u.servicereg.InterfaceID == mDNSInterface_P2P || (!instance->request->u.servicereg.InterfaceID && SameDomainName(&instance->domain, &localdomain) && (instance->request->flags & kDNSServiceFlagsIncludeP2P)))) { LogInfo("add_record_to_service: calling external_start_advertising_service"); external_start_advertising_service(&extra->r.resrec); } return result; } mDNSlocal mStatus handle_add_request(request_state *request) { service_instance *i; mStatus result = mStatus_UnknownErr; DNSServiceFlags flags = get_flags (&request->msgptr, request->msgend); mDNSu16 rrtype = get_uint16(&request->msgptr, request->msgend); mDNSu16 rdlen = get_uint16(&request->msgptr, request->msgend); const char *rdata = get_rdata (&request->msgptr, request->msgend, rdlen); mDNSu32 ttl = get_uint32(&request->msgptr, request->msgend); if (!ttl) ttl = DefaultTTLforRRType(rrtype); (void)flags; // Unused if (!request->msgptr) { LogMsg("%3d: DNSServiceAddRecord(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } // If this is a shared connection, check if the operation actually applies to a subordinate request_state object if (request->terminate == connection_termination) request = LocateSubordinateRequest(request); if (request->terminate != regservice_termination_callback) { LogMsg("%3d: DNSServiceAddRecord(not a registered service ref)", request->sd); return(mStatus_BadParamErr); } // For a service registered with zero port, don't allow adding records. This mostly happens due to a bug // in the application. See radar://9165807. if (mDNSIPPortIsZero(request->u.servicereg.port)) { LogMsg("%3d: DNSServiceAddRecord: adding record to a service registered with zero port", request->sd); return(mStatus_BadParamErr); } LogOperation("%3d: DNSServiceAddRecord(%X, %##s, %s, %d)", request->sd, flags, (request->u.servicereg.instances) ? request->u.servicereg.instances->srs.RR_SRV.resrec.name->c : NULL, DNSTypeName(rrtype), rdlen); for (i = request->u.servicereg.instances; i; i = i->next) { result = add_record_to_service(request, i, rrtype, rdlen, rdata, ttl); if (result && i->default_local) break; else result = mStatus_NoError; // suppress non-local default errors } return(result); } mDNSlocal void update_callback(mDNS *const m, AuthRecord *const rr, RData *oldrd, mDNSu16 oldrdlen) { mDNSBool external_advertise = (rr->UpdateContext) ? *((mDNSBool *)rr->UpdateContext) : mDNSfalse; (void)m; // Unused // There are three cases. // // 1. We have updated the primary TXT record of the service // 2. We have updated the TXT record that was added to the service using DNSServiceAddRecord // 3. We have updated the TXT record that was registered using DNSServiceRegisterRecord // // external_advertise is set if we have advertised at least once during the initial addition // of the record in all of the three cases above. We should have checked for InterfaceID/LocalDomain // checks during the first time and hence we don't do any checks here if (external_advertise) { ResourceRecord ext = rr->resrec; if (ext.rdlength == oldrdlen && mDNSPlatformMemSame(&ext.rdata->u, &oldrd->u, oldrdlen)) goto exit; SetNewRData(&ext, oldrd, oldrdlen); external_stop_advertising_service(&ext); LogInfo("update_callback: calling external_start_advertising_service"); external_start_advertising_service(&rr->resrec); } exit: if (oldrd != &rr->rdatastorage) freeL("RData/update_callback", oldrd); } mDNSlocal mStatus update_record(AuthRecord *rr, mDNSu16 rdlen, const char *rdata, mDNSu32 ttl, const mDNSBool *const external_advertise) { mStatus result; const int rdsize = rdlen > sizeof(RDataBody) ? rdlen : sizeof(RDataBody); RData *newrd = mallocL("RData/update_record", sizeof(RData) - sizeof(RDataBody) + rdsize); if (!newrd) FatalError("ERROR: malloc"); newrd->MaxRDLength = (mDNSu16) rdsize; mDNSPlatformMemCopy(&newrd->u, rdata, rdlen); // BIND named (name daemon) doesn't allow TXT records with zero-length rdata. This is strictly speaking correct, // since RFC 1035 specifies a TXT record as "One or more s", not "Zero or more s". // Since some legacy apps try to create zero-length TXT records, we'll silently correct it here. if (rr->resrec.rrtype == kDNSType_TXT && rdlen == 0) { rdlen = 1; newrd->u.txt.c[0] = 0; } if (external_advertise) rr->UpdateContext = (void *)external_advertise; result = mDNS_Update(&mDNSStorage, rr, ttl, rdlen, newrd, update_callback); if (result) { LogMsg("update_record: Error %d for %s", (int)result, ARDisplayString(&mDNSStorage, rr)); freeL("RData/update_record", newrd); } return result; } mDNSlocal mStatus handle_update_request(request_state *request) { const ipc_msg_hdr *const hdr = &request->hdr; mStatus result = mStatus_BadReferenceErr; service_instance *i; AuthRecord *rr = NULL; // get the message data DNSServiceFlags flags = get_flags (&request->msgptr, request->msgend); // flags unused mDNSu16 rdlen = get_uint16(&request->msgptr, request->msgend); const char *rdata = get_rdata (&request->msgptr, request->msgend, rdlen); mDNSu32 ttl = get_uint32(&request->msgptr, request->msgend); (void)flags; // Unused if (!request->msgptr) { LogMsg("%3d: DNSServiceUpdateRecord(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } // If this is a shared connection, check if the operation actually applies to a subordinate request_state object if (request->terminate == connection_termination) request = LocateSubordinateRequest(request); if (request->terminate == connection_termination) { // update an individually registered record registered_record_entry *reptr; for (reptr = request->u.reg_recs; reptr; reptr = reptr->next) { if (reptr->key == hdr->reg_index) { result = update_record(reptr->rr, rdlen, rdata, ttl, &reptr->external_advertise); LogOperation("%3d: DNSServiceUpdateRecord(%##s, %s)", request->sd, reptr->rr->resrec.name->c, reptr->rr ? DNSTypeName(reptr->rr->resrec.rrtype) : ""); goto end; } } result = mStatus_BadReferenceErr; goto end; } if (request->terminate != regservice_termination_callback) { LogMsg("%3d: DNSServiceUpdateRecord(not a registered service ref)", request->sd); return(mStatus_BadParamErr); } // For a service registered with zero port, only SRV record is initialized. Don't allow any updates. if (mDNSIPPortIsZero(request->u.servicereg.port)) { LogMsg("%3d: DNSServiceUpdateRecord: updating the record of a service registered with zero port", request->sd); return(mStatus_BadParamErr); } // update the saved off TXT data for the service if (hdr->reg_index == TXT_RECORD_INDEX) { if (request->u.servicereg.txtdata) { freeL("service_info txtdata", request->u.servicereg.txtdata); request->u.servicereg.txtdata = NULL; } if (rdlen > 0) { request->u.servicereg.txtdata = mallocL("service_info txtdata", rdlen); if (!request->u.servicereg.txtdata) FatalError("ERROR: handle_update_request - malloc"); mDNSPlatformMemCopy(request->u.servicereg.txtdata, rdata, rdlen); } request->u.servicereg.txtlen = rdlen; } // update a record from a service record set for (i = request->u.servicereg.instances; i; i = i->next) { if (hdr->reg_index == TXT_RECORD_INDEX) rr = &i->srs.RR_TXT; else { ExtraResourceRecord *e; for (e = i->srs.Extras; e; e = e->next) if (e->ClientID == hdr->reg_index) { rr = &e->r; break; } } if (!rr) { result = mStatus_BadReferenceErr; goto end; } result = update_record(rr, rdlen, rdata, ttl, &i->external_advertise); if (result && i->default_local) goto end; else result = mStatus_NoError; // suppress non-local default errors } end: if (request->terminate == regservice_termination_callback) LogOperation("%3d: DNSServiceUpdateRecord(%##s, %s)", request->sd, (request->u.servicereg.instances) ? request->u.servicereg.instances->srs.RR_SRV.resrec.name->c : NULL, rr ? DNSTypeName(rr->resrec.rrtype) : ""); return(result); } // remove a resource record registered via DNSServiceRegisterRecord() mDNSlocal mStatus remove_record(request_state *request) { mStatus err = mStatus_UnknownErr; registered_record_entry *e, **ptr = &request->u.reg_recs; while (*ptr && (*ptr)->key != request->hdr.reg_index) ptr = &(*ptr)->next; if (!*ptr) { LogMsg("%3d: DNSServiceRemoveRecord(%u) not found", request->sd, request->hdr.reg_index); return mStatus_BadReferenceErr; } e = *ptr; *ptr = e->next; // unlink LogOperation("%3d: DNSServiceRemoveRecord(%u %s)", request->sd, e->key, RRDisplayString(&mDNSStorage, &e->rr->resrec)); e->rr->RecordContext = NULL; if (e->external_advertise) { external_stop_advertising_service(&e->rr->resrec); e->external_advertise = mDNSfalse; } err = mDNS_Deregister(&mDNSStorage, e->rr); // Will free e->rr for us; we're responsible for freeing e if (err) { LogMsg("ERROR: remove_record, mDNS_Deregister: %d", err); freeL("registered_record_entry AuthRecord remove_record", e->rr); } freeL("registered_record_entry remove_record", e); return err; } mDNSlocal mStatus remove_extra(const request_state *const request, service_instance *const serv, mDNSu16 *const rrtype) { mStatus err = mStatus_BadReferenceErr; ExtraResourceRecord *ptr; for (ptr = serv->srs.Extras; ptr; ptr = ptr->next) { if (ptr->ClientID == request->hdr.reg_index) // found match { *rrtype = ptr->r.resrec.rrtype; if (serv->external_advertise) external_stop_advertising_service(&ptr->r.resrec); err = mDNS_RemoveRecordFromService(&mDNSStorage, &serv->srs, ptr, FreeExtraRR, ptr); break; } } return err; } mDNSlocal mStatus handle_removerecord_request(request_state *request) { mStatus err = mStatus_BadReferenceErr; get_flags(&request->msgptr, request->msgend); // flags unused if (!request->msgptr) { LogMsg("%3d: DNSServiceRemoveRecord(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } // If this is a shared connection, check if the operation actually applies to a subordinate request_state object if (request->terminate == connection_termination) request = LocateSubordinateRequest(request); if (request->terminate == connection_termination) err = remove_record(request); // remove individually registered record else if (request->terminate != regservice_termination_callback) { LogMsg("%3d: DNSServiceRemoveRecord(not a registered service ref)", request->sd); return(mStatus_BadParamErr); } else { service_instance *i; mDNSu16 rrtype = 0; LogOperation("%3d: DNSServiceRemoveRecord(%##s, %s)", request->sd, (request->u.servicereg.instances) ? request->u.servicereg.instances->srs.RR_SRV.resrec.name->c : NULL, rrtype ? DNSTypeName(rrtype) : ""); for (i = request->u.servicereg.instances; i; i = i->next) { err = remove_extra(request, i, &rrtype); if (err && i->default_local) break; else err = mStatus_NoError; // suppress non-local default errors } } return(err); } // If there's a comma followed by another character, // FindFirstSubType overwrites the comma with a nul and returns the pointer to the next character. // Otherwise, it returns a pointer to the final nul at the end of the string mDNSlocal char *FindFirstSubType(char *p) { while (*p) { if (p[0] == '\\' && p[1]) p += 2; else if (p[0] == ',' && p[1]) { *p++ = 0; return(p); } else p++; } return(p); } // If there's a comma followed by another character, // FindNextSubType overwrites the comma with a nul and returns the pointer to the next character. // If it finds an illegal unescaped dot in the subtype name, it returns mDNSNULL // Otherwise, it returns a pointer to the final nul at the end of the string mDNSlocal char *FindNextSubType(char *p) { while (*p) { if (p[0] == '\\' && p[1]) // If escape character p += 2; // ignore following character else if (p[0] == ',') // If we found a comma { if (p[1]) *p++ = 0; return(p); } else if (p[0] == '.') return(mDNSNULL); else p++; } return(p); } // Returns -1 if illegal subtype found mDNSexport mDNSs32 ChopSubTypes(char *regtype) { mDNSs32 NumSubTypes = 0; char *stp = FindFirstSubType(regtype); while (stp && *stp) // If we found a comma... { if (*stp == ',') return(-1); NumSubTypes++; stp = FindNextSubType(stp); } if (!stp) return(-1); return(NumSubTypes); } mDNSexport AuthRecord *AllocateSubTypes(mDNSs32 NumSubTypes, char *p) { AuthRecord *st = mDNSNULL; if (NumSubTypes) { mDNSs32 i; st = mallocL("ServiceSubTypes", NumSubTypes * sizeof(AuthRecord)); if (!st) return(mDNSNULL); for (i = 0; i < NumSubTypes; i++) { mDNS_SetupResourceRecord(&st[i], mDNSNULL, mDNSInterface_Any, kDNSQType_ANY, kStandardTTL, 0, AuthRecordAny, mDNSNULL, mDNSNULL); while (*p) p++; p++; if (!MakeDomainNameFromDNSNameString(&st[i].namestorage, p)) { freeL("ServiceSubTypes", st); return(mDNSNULL); } } } return(st); } mDNSlocal mStatus register_service_instance(request_state *request, const domainname *domain) { service_instance **ptr, *instance; const int extra_size = (request->u.servicereg.txtlen > sizeof(RDataBody)) ? (request->u.servicereg.txtlen - sizeof(RDataBody)) : 0; const mDNSBool DomainIsLocal = SameDomainName(domain, &localdomain); mStatus result; mDNSInterfaceID interfaceID = request->u.servicereg.InterfaceID; mDNSu32 regFlags = 0; if (interfaceID == mDNSInterface_P2P) { interfaceID = mDNSInterface_Any; regFlags |= regFlagIncludeP2P; } else if (request->flags & kDNSServiceFlagsIncludeP2P) regFlags |= regFlagIncludeP2P; // client guarantees that record names are unique if (request->flags & kDNSServiceFlagsForce) regFlags |= regFlagKnownUnique; // If the client specified an interface, but no domain, then we honor the specified interface for the "local" (mDNS) // registration but for the wide-area registrations we don't (currently) have any concept of a wide-area unicast // registrations scoped to a specific interface, so for the automatic domains we add we must *not* specify an interface. // (Specifying an interface with an apparently wide-area domain (i.e. something other than "local") // currently forces the registration to use mDNS multicast despite the apparently wide-area domain.) if (request->u.servicereg.default_domain && !DomainIsLocal) interfaceID = mDNSInterface_Any; for (ptr = &request->u.servicereg.instances; *ptr; ptr = &(*ptr)->next) { if (SameDomainName(&(*ptr)->domain, domain)) { LogMsg("register_service_instance: domain %##s already registered for %#s.%##s", domain->c, &request->u.servicereg.name, &request->u.servicereg.type); return mStatus_AlreadyRegistered; } } if (mDNSStorage.KnownBugs & mDNS_KnownBug_LimitedIPv6) { // Special-case hack: On Mac OS X 10.6.x and earlier we don't advertise SMB service in AutoTunnel domains, // because AutoTunnel services have to support IPv6, and in Mac OS X 10.6.x the SMB server does not. // BTMM: Don't advertise SMB with BTMM because it doesn't support IPv6 if (SameDomainName(&request->u.servicereg.type, (const domainname *) "\x4" "_smb" "\x4" "_tcp")) { DomainAuthInfo *AuthInfo = GetAuthInfoForName(&mDNSStorage, domain); if (AuthInfo && AuthInfo->AutoTunnel) return(kDNSServiceErr_Unsupported); } } instance = mallocL("service_instance", sizeof(*instance) + extra_size); if (!instance) { my_perror("ERROR: malloc"); return mStatus_NoMemoryErr; } instance->next = mDNSNULL; instance->request = request; instance->subtypes = AllocateSubTypes(request->u.servicereg.num_subtypes, request->u.servicereg.type_as_string); instance->renameonmemfree = 0; instance->clientnotified = mDNSfalse; instance->default_local = (request->u.servicereg.default_domain && DomainIsLocal); instance->external_advertise = mDNSfalse; AssignDomainName(&instance->domain, domain); if (request->u.servicereg.num_subtypes && !instance->subtypes) { unlink_and_free_service_instance(instance); instance = NULL; FatalError("ERROR: malloc"); } result = mDNS_RegisterService(&mDNSStorage, &instance->srs, &request->u.servicereg.name, &request->u.servicereg.type, domain, request->u.servicereg.host.c[0] ? &request->u.servicereg.host : NULL, request->u.servicereg.port, request->u.servicereg.txtdata, request->u.servicereg.txtlen, instance->subtypes, request->u.servicereg.num_subtypes, interfaceID, regservice_callback, instance, regFlags); if (!result) { *ptr = instance; // Append this to the end of our request->u.servicereg.instances list LogOperation("%3d: DNSServiceRegister(%##s, %u) ADDED", instance->request->sd, instance->srs.RR_SRV.resrec.name->c, mDNSVal16(request->u.servicereg.port)); } else { LogMsg("register_service_instance %#s.%##s%##s error %d", &request->u.servicereg.name, &request->u.servicereg.type, domain->c, result); unlink_and_free_service_instance(instance); } return result; } mDNSlocal void udsserver_default_reg_domain_changed(const DNameListElem *const d, const mDNSBool add) { request_state *request; #if APPLE_OSX_mDNSResponder machserver_automatic_registration_domain_changed(&d->name, add); #endif // APPLE_OSX_mDNSResponder LogMsg("%s registration domain %##s", add ? "Adding" : "Removing", d->name.c); for (request = all_requests; request; request = request->next) { if (request->terminate != regservice_termination_callback) continue; if (!request->u.servicereg.default_domain) continue; if (!d->uid || SystemUID(request->uid) || request->uid == d->uid) { service_instance **ptr = &request->u.servicereg.instances; while (*ptr && !SameDomainName(&(*ptr)->domain, &d->name)) ptr = &(*ptr)->next; if (add) { // If we don't already have this domain in our list for this registration, add it now if (!*ptr) register_service_instance(request, &d->name); else debugf("udsserver_default_reg_domain_changed %##s already in list, not re-adding", &d->name); } else { // Normally we should not fail to find the specified instance // One case where this can happen is if a uDNS update fails for some reason, // and regservice_callback then calls unlink_and_free_service_instance and disposes of that instance. if (!*ptr) LogMsg("udsserver_default_reg_domain_changed domain %##s not found for service %#s type %s", &d->name, request->u.servicereg.name.c, request->u.servicereg.type_as_string); else { DNameListElem *p; for (p = AutoRegistrationDomains; p; p=p->next) if (!p->uid || SystemUID(request->uid) || request->uid == p->uid) if (SameDomainName(&d->name, &p->name)) break; if (p) debugf("udsserver_default_reg_domain_changed %##s still in list, not removing", &d->name); else { mStatus err; service_instance *si = *ptr; *ptr = si->next; if (si->clientnotified) SendServiceRemovalNotification(&si->srs); // Do this *before* clearing si->request backpointer // Now that we've cut this service_instance from the list, we MUST clear the si->request backpointer. // Otherwise what can happen is this: While our mDNS_DeregisterService is in the // process of completing asynchronously, the client cancels the entire operation, so // regservice_termination_callback then runs through the whole list deregistering each // instance, clearing the backpointers, and then disposing the parent request_state object. // However, because this service_instance isn't in the list any more, regservice_termination_callback // has no way to find it and clear its backpointer, and then when our mDNS_DeregisterService finally // completes later with a mStatus_MemFree message, it calls unlink_and_free_service_instance() with // a service_instance with a stale si->request backpointer pointing to memory that's already been freed. si->request = NULL; err = mDNS_DeregisterService(&mDNSStorage, &si->srs); if (err) { LogMsg("udsserver_default_reg_domain_changed err %d", err); unlink_and_free_service_instance(si); } } } } } } } mDNSlocal mStatus handle_regservice_request(request_state *request) { char name[256]; // Lots of spare space for extra-long names that we'll auto-truncate down to 63 bytes char domain[MAX_ESCAPED_DOMAIN_NAME], host[MAX_ESCAPED_DOMAIN_NAME]; char type_as_string[MAX_ESCAPED_DOMAIN_NAME]; domainname d, srv; mStatus err; const char *msgTXTData; DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend); mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend); mDNSInterfaceID InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex); if (interfaceIndex && !InterfaceID) { LogMsg("ERROR: handle_regservice_request - Couldn't find interfaceIndex %d", interfaceIndex); return(mStatus_BadParamErr); } if (get_string(&request->msgptr, request->msgend, name, sizeof(name)) < 0 || get_string(&request->msgptr, request->msgend, type_as_string, MAX_ESCAPED_DOMAIN_NAME) < 0 || get_string(&request->msgptr, request->msgend, domain, MAX_ESCAPED_DOMAIN_NAME) < 0 || get_string(&request->msgptr, request->msgend, host, MAX_ESCAPED_DOMAIN_NAME) < 0) { LogMsg("ERROR: handle_regservice_request - Couldn't read name/regtype/domain"); return(mStatus_BadParamErr); } request->flags = flags; request->u.servicereg.InterfaceID = InterfaceID; request->u.servicereg.instances = NULL; request->u.servicereg.txtlen = 0; request->u.servicereg.txtdata = NULL; mDNSPlatformStrLCopy(request->u.servicereg.type_as_string, type_as_string, sizeof(request->u.servicereg.type_as_string)); if (request->msgptr + 2 > request->msgend) request->msgptr = NULL; else { request->u.servicereg.port.b[0] = *request->msgptr++; request->u.servicereg.port.b[1] = *request->msgptr++; } request->u.servicereg.txtlen = get_uint16(&request->msgptr, request->msgend); msgTXTData = get_rdata(&request->msgptr, request->msgend, request->u.servicereg.txtlen); if (!request->msgptr) { LogMsg("%3d: DNSServiceRegister(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } if (request->u.servicereg.txtlen) { request->u.servicereg.txtdata = mallocL("service_info txtdata", request->u.servicereg.txtlen); if (!request->u.servicereg.txtdata) FatalError("ERROR: handle_regservice_request - malloc"); mDNSPlatformMemCopy(request->u.servicereg.txtdata, msgTXTData, request->u.servicereg.txtlen); } // Check for sub-types after the service type request->u.servicereg.num_subtypes = ChopSubTypes(request->u.servicereg.type_as_string); // Note: Modifies regtype string to remove trailing subtypes if (request->u.servicereg.num_subtypes < 0) { LogMsg("ERROR: handle_regservice_request - ChopSubTypes failed %s", request->u.servicereg.type_as_string); return(mStatus_BadParamErr); } // Don't try to construct "domainname t" until *after* ChopSubTypes has worked its magic if (!*request->u.servicereg.type_as_string || !MakeDomainNameFromDNSNameString(&request->u.servicereg.type, request->u.servicereg.type_as_string)) { LogMsg("ERROR: handle_regservice_request - type_as_string bad %s", request->u.servicereg.type_as_string); return(mStatus_BadParamErr); } if (!name[0]) { request->u.servicereg.name = mDNSStorage.nicelabel; request->u.servicereg.autoname = mDNStrue; } else { // If the client is allowing AutoRename, then truncate name to legal length before converting it to a DomainLabel if ((flags & kDNSServiceFlagsNoAutoRename) == 0) { int newlen = TruncateUTF8ToLength((mDNSu8*)name, mDNSPlatformStrLen(name), MAX_DOMAIN_LABEL); name[newlen] = 0; } if (!MakeDomainLabelFromLiteralString(&request->u.servicereg.name, name)) { LogMsg("ERROR: handle_regservice_request - name bad %s", name); return(mStatus_BadParamErr); } request->u.servicereg.autoname = mDNSfalse; } if (*domain) { request->u.servicereg.default_domain = mDNSfalse; if (!MakeDomainNameFromDNSNameString(&d, domain)) { LogMsg("ERROR: handle_regservice_request - domain bad %s", domain); return(mStatus_BadParamErr); } } else { request->u.servicereg.default_domain = mDNStrue; MakeDomainNameFromDNSNameString(&d, "local."); } if (!ConstructServiceName(&srv, &request->u.servicereg.name, &request->u.servicereg.type, &d)) { LogMsg("ERROR: handle_regservice_request - Couldn't ConstructServiceName from, “%#s” “%##s” “%##s”", request->u.servicereg.name.c, request->u.servicereg.type.c, d.c); return(mStatus_BadParamErr); } if (!MakeDomainNameFromDNSNameString(&request->u.servicereg.host, host)) { LogMsg("ERROR: handle_regservice_request - host bad %s", host); return(mStatus_BadParamErr); } request->u.servicereg.autorename = (flags & kDNSServiceFlagsNoAutoRename ) == 0; request->u.servicereg.allowremotequery = (flags & kDNSServiceFlagsAllowRemoteQuery) != 0; // Some clients use mDNS for lightweight copy protection, registering a pseudo-service with // a port number of zero. When two instances of the protected client are allowed to run on one // machine, we don't want to see misleading "Bogus client" messages in syslog and the console. if (!mDNSIPPortIsZero(request->u.servicereg.port)) { int count = CountExistingRegistrations(&srv, request->u.servicereg.port); if (count) LogMsg("Client application registered %d identical instances of service %##s port %u.", count+1, srv.c, mDNSVal16(request->u.servicereg.port)); } LogOperation("%3d: DNSServiceRegister(%X, %d, \"%s\", \"%s\", \"%s\", \"%s\", %u) START", request->sd, flags, interfaceIndex, name, request->u.servicereg.type_as_string, domain, host, mDNSVal16(request->u.servicereg.port)); // We need to unconditionally set request->terminate, because even if we didn't successfully // start any registrations right now, subsequent configuration changes may cause successful // registrations to be added, and we'll need to cancel them before freeing this memory. // We also need to set request->terminate first, before adding additional service instances, // because the uds_validatelists uses the request->terminate function pointer to determine // what kind of request this is, and therefore what kind of list validation is required. request->terminate = regservice_termination_callback; err = register_service_instance(request, &d); #if 0 err = AuthorizedDomain(request, &d, AutoRegistrationDomains) ? register_service_instance(request, &d) : mStatus_NoError; #endif if (!err) { if (request->u.servicereg.autoname) UpdateDeviceInfoRecord(&mDNSStorage); if (!*domain) { DNameListElem *ptr; // Note that we don't report errors for non-local, non-explicit domains for (ptr = AutoRegistrationDomains; ptr; ptr = ptr->next) if (!ptr->uid || SystemUID(request->uid) || request->uid == ptr->uid) register_service_instance(request, &ptr->name); } } return(err); } // *************************************************************************** #if COMPILER_LIKES_PRAGMA_MARK #pragma mark - #pragma mark - DNSServiceBrowse #endif mDNSlocal void FoundInstance(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord) { const DNSServiceFlags flags = AddRecord ? kDNSServiceFlagsAdd : 0; request_state *req = question->QuestionContext; reply_state *rep; (void)m; // Unused if (answer->rrtype != kDNSType_PTR) { LogMsg("%3d: FoundInstance: Should not be called with rrtype %d (not a PTR record)", req->sd, answer->rrtype); return; } if (GenerateNTDResponse(&answer->rdata->u.name, answer->InterfaceID, req, &rep, browse_reply_op, flags, mStatus_NoError) != mStatus_NoError) { if (SameDomainName(&req->u.browser.regtype, (const domainname*)"\x09_services\x07_dns-sd\x04_udp")) { // Special support to enable the DNSServiceBrowse call made by Bonjour Browser // Remove after Bonjour Browser is updated to use DNSServiceQueryRecord instead of DNSServiceBrowse GenerateBonjourBrowserResponse(&answer->rdata->u.name, answer->InterfaceID, req, &rep, browse_reply_op, flags, mStatus_NoError); goto bonjourbrowserhack; } LogMsg("%3d: FoundInstance: %##s PTR %##s received from network is not valid DNS-SD service pointer", req->sd, answer->name->c, answer->rdata->u.name.c); return; } bonjourbrowserhack: LogOperation("%3d: DNSServiceBrowse(%##s, %s) RESULT %s %d: %s", req->sd, question->qname.c, DNSTypeName(question->qtype), AddRecord ? "Add" : "Rmv", mDNSPlatformInterfaceIndexfromInterfaceID(m, answer->InterfaceID, mDNSfalse), RRDisplayString(m, answer)); append_reply(req, rep); } mDNSlocal mStatus add_domain_to_browser(request_state *info, const domainname *d) { browser_t *b, *p; mStatus err; for (p = info->u.browser.browsers; p; p = p->next) { if (SameDomainName(&p->domain, d)) { debugf("add_domain_to_browser %##s already in list", d->c); return mStatus_AlreadyRegistered; } } b = mallocL("browser_t", sizeof(*b)); if (!b) return mStatus_NoMemoryErr; AssignDomainName(&b->domain, d); err = mDNS_StartBrowse(&mDNSStorage, &b->q, &info->u.browser.regtype, d, info->u.browser.interface_id, info->u.browser.ForceMCast, FoundInstance, info); if (err) { LogMsg("mDNS_StartBrowse returned %d for type %##s domain %##s", err, info->u.browser.regtype.c, d->c); freeL("browser_t/add_domain_to_browser", b); } else { b->next = info->u.browser.browsers; info->u.browser.browsers = b; LogOperation("%3d: DNSServiceBrowse(%##s) START", info->sd, b->q.qname.c); if (info->u.browser.interface_id == mDNSInterface_P2P || (!info->u.browser.interface_id && SameDomainName(&b->domain, &localdomain) && (info->flags & kDNSServiceFlagsIncludeP2P))) { domainname tmp; ConstructServiceName(&tmp, NULL, &info->u.browser.regtype, &b->domain); LogInfo("add_domain_to_browser: calling external_start_browsing_for_service()"); external_start_browsing_for_service(&mDNSStorage, &tmp, kDNSType_PTR); } } return err; } mDNSlocal void browse_termination_callback(request_state *info) { while (info->u.browser.browsers) { browser_t *ptr = info->u.browser.browsers; if (info->u.browser.interface_id == mDNSInterface_P2P || (!info->u.browser.interface_id && SameDomainName(&ptr->domain, &localdomain) && (info->flags & kDNSServiceFlagsIncludeP2P))) { domainname tmp; ConstructServiceName(&tmp, NULL, &info->u.browser.regtype, &ptr->domain); LogInfo("browse_termination_callback: calling external_stop_browsing_for_service()"); external_stop_browsing_for_service(&mDNSStorage, &tmp, kDNSType_PTR); } info->u.browser.browsers = ptr->next; LogOperation("%3d: DNSServiceBrowse(%##s) STOP", info->sd, ptr->q.qname.c); mDNS_StopBrowse(&mDNSStorage, &ptr->q); // no need to error-check result freeL("browser_t/browse_termination_callback", ptr); } } mDNSlocal void udsserver_automatic_browse_domain_changed(const DNameListElem *const d, const mDNSBool add) { request_state *request; debugf("udsserver_automatic_browse_domain_changed: %s default browse domain %##s", add ? "Adding" : "Removing", d->name.c); #if APPLE_OSX_mDNSResponder machserver_automatic_browse_domain_changed(&d->name, add); #endif // APPLE_OSX_mDNSResponder for (request = all_requests; request; request = request->next) { if (request->terminate != browse_termination_callback) continue; // Not a browse operation if (!request->u.browser.default_domain) continue; // Not an auto-browse operation if (!d->uid || SystemUID(request->uid) || request->uid == d->uid) { browser_t **ptr = &request->u.browser.browsers; while (*ptr && !SameDomainName(&(*ptr)->domain, &d->name)) ptr = &(*ptr)->next; if (add) { // If we don't already have this domain in our list for this browse operation, add it now if (!*ptr) add_domain_to_browser(request, &d->name); else debugf("udsserver_automatic_browse_domain_changed %##s already in list, not re-adding", &d->name); } else { if (!*ptr) LogMsg("udsserver_automatic_browse_domain_changed ERROR %##s not found", &d->name); else { DNameListElem *p; for (p = AutoBrowseDomains; p; p=p->next) if (!p->uid || SystemUID(request->uid) || request->uid == p->uid) if (SameDomainName(&d->name, &p->name)) break; if (p) debugf("udsserver_automatic_browse_domain_changed %##s still in list, not removing", &d->name); else { browser_t *rem = *ptr; *ptr = (*ptr)->next; mDNS_StopQueryWithRemoves(&mDNSStorage, &rem->q); freeL("browser_t/udsserver_automatic_browse_domain_changed", rem); } } } } } } mDNSlocal void FreeARElemCallback(mDNS *const m, AuthRecord *const rr, mStatus result) { (void)m; // unused if (result == mStatus_MemFree) { // On shutdown, mDNS_Close automatically deregisters all records // Since in this case no one has called DeregisterLocalOnlyDomainEnumPTR to cut the record // from the LocalDomainEnumRecords list, we do this here before we free the memory. // (This should actually no longer be necessary, now that we do the proper cleanup in // udsserver_exit. To confirm this, we'll log an error message if we do find a record that // hasn't been cut from the list yet. If these messages don't appear, we can delete this code.) ARListElem **ptr = &LocalDomainEnumRecords; while (*ptr && &(*ptr)->ar != rr) ptr = &(*ptr)->next; if (*ptr) { *ptr = (*ptr)->next; LogMsg("FreeARElemCallback: Have to cut %s", ARDisplayString(m, rr)); } mDNSPlatformMemFree(rr->RecordContext); } } // RegisterLocalOnlyDomainEnumPTR and DeregisterLocalOnlyDomainEnumPTR largely duplicate code in // "FoundDomain" in uDNS.c for creating and destroying these special mDNSInterface_LocalOnly records. // We may want to turn the common code into a subroutine. mDNSlocal void RegisterLocalOnlyDomainEnumPTR(mDNS *m, const domainname *d, int type) { // allocate/register legacy and non-legacy _browse PTR record mStatus err; ARListElem *ptr = mDNSPlatformMemAllocate(sizeof(*ptr)); debugf("Incrementing %s refcount for %##s", (type == mDNS_DomainTypeBrowse ) ? "browse domain " : (type == mDNS_DomainTypeRegistration ) ? "registration dom" : (type == mDNS_DomainTypeBrowseAutomatic) ? "automatic browse" : "?", d->c); mDNS_SetupResourceRecord(&ptr->ar, mDNSNULL, mDNSInterface_LocalOnly, kDNSType_PTR, 7200, kDNSRecordTypeShared, AuthRecordLocalOnly, FreeARElemCallback, ptr); MakeDomainNameFromDNSNameString(&ptr->ar.namestorage, mDNS_DomainTypeNames[type]); AppendDNSNameString (&ptr->ar.namestorage, "local"); AssignDomainName(&ptr->ar.resrec.rdata->u.name, d); err = mDNS_Register(m, &ptr->ar); if (err) { LogMsg("SetSCPrefsBrowseDomain: mDNS_Register returned error %d", err); mDNSPlatformMemFree(ptr); } else { ptr->next = LocalDomainEnumRecords; LocalDomainEnumRecords = ptr; } } mDNSlocal void DeregisterLocalOnlyDomainEnumPTR(mDNS *m, const domainname *d, int type) { ARListElem **ptr = &LocalDomainEnumRecords; domainname lhs; // left-hand side of PTR, for comparison debugf("Decrementing %s refcount for %##s", (type == mDNS_DomainTypeBrowse ) ? "browse domain " : (type == mDNS_DomainTypeRegistration ) ? "registration dom" : (type == mDNS_DomainTypeBrowseAutomatic) ? "automatic browse" : "?", d->c); MakeDomainNameFromDNSNameString(&lhs, mDNS_DomainTypeNames[type]); AppendDNSNameString (&lhs, "local"); while (*ptr) { if (SameDomainName(&(*ptr)->ar.resrec.rdata->u.name, d) && SameDomainName((*ptr)->ar.resrec.name, &lhs)) { ARListElem *rem = *ptr; *ptr = (*ptr)->next; mDNS_Deregister(m, &rem->ar); return; } else ptr = &(*ptr)->next; } } mDNSlocal void AddAutoBrowseDomain(const mDNSu32 uid, const domainname *const name) { DNameListElem *new = mDNSPlatformMemAllocate(sizeof(DNameListElem)); if (!new) { LogMsg("ERROR: malloc"); return; } AssignDomainName(&new->name, name); new->uid = uid; new->next = AutoBrowseDomains; AutoBrowseDomains = new; udsserver_automatic_browse_domain_changed(new, mDNStrue); } mDNSlocal void RmvAutoBrowseDomain(const mDNSu32 uid, const domainname *const name) { DNameListElem **p = &AutoBrowseDomains; while (*p && (!SameDomainName(&(*p)->name, name) || (*p)->uid != uid)) p = &(*p)->next; if (!*p) LogMsg("RmvAutoBrowseDomain: Got remove event for domain %##s not in list", name->c); else { DNameListElem *ptr = *p; *p = ptr->next; udsserver_automatic_browse_domain_changed(ptr, mDNSfalse); mDNSPlatformMemFree(ptr); } } mDNSlocal void SetPrefsBrowseDomains(mDNS *m, DNameListElem *browseDomains, mDNSBool add) { DNameListElem *d; for (d = browseDomains; d; d = d->next) { if (add) { RegisterLocalOnlyDomainEnumPTR(m, &d->name, mDNS_DomainTypeBrowse); AddAutoBrowseDomain(d->uid, &d->name); } else { DeregisterLocalOnlyDomainEnumPTR(m, &d->name, mDNS_DomainTypeBrowse); RmvAutoBrowseDomain(d->uid, &d->name); } } } mDNSlocal void UpdateDeviceInfoRecord(mDNS *const m) { int num_autoname = 0; request_state *req; for (req = all_requests; req; req = req->next) if (req->terminate == regservice_termination_callback && req->u.servicereg.autoname) num_autoname++; // If DeviceInfo record is currently registered, see if we need to deregister it if (m->DeviceInfo.resrec.RecordType != kDNSRecordTypeUnregistered) if (num_autoname == 0 || !SameDomainLabelCS(m->DeviceInfo.resrec.name->c, m->nicelabel.c)) { LogOperation("UpdateDeviceInfoRecord Deregister %##s", m->DeviceInfo.resrec.name); mDNS_Deregister(m, &m->DeviceInfo); } // If DeviceInfo record is not currently registered, see if we need to register it if (m->DeviceInfo.resrec.RecordType == kDNSRecordTypeUnregistered) if (num_autoname > 0) { mDNSu8 len = m->HIHardware.c[0] < 255 - 6 ? m->HIHardware.c[0] : 255 - 6; mDNS_SetupResourceRecord(&m->DeviceInfo, mDNSNULL, mDNSNULL, kDNSType_TXT, kStandardTTL, kDNSRecordTypeAdvisory, AuthRecordAny, mDNSNULL, mDNSNULL); ConstructServiceName(&m->DeviceInfo.namestorage, &m->nicelabel, &DeviceInfoName, &localdomain); mDNSPlatformMemCopy(m->DeviceInfo.resrec.rdata->u.data + 1, "model=", 6); mDNSPlatformMemCopy(m->DeviceInfo.resrec.rdata->u.data + 7, m->HIHardware.c + 1, len); m->DeviceInfo.resrec.rdata->u.data[0] = 6 + len; // "model=" plus the device string m->DeviceInfo.resrec.rdlength = 7 + len; // One extra for the length byte at the start of the string LogOperation("UpdateDeviceInfoRecord Register %##s", m->DeviceInfo.resrec.name); mDNS_Register(m, &m->DeviceInfo); } } mDNSexport void udsserver_handle_configchange(mDNS *const m) { request_state *req; service_instance *ptr; DNameListElem *RegDomains = NULL; DNameListElem *BrowseDomains = NULL; DNameListElem *p; UpdateDeviceInfoRecord(m); // For autoname services, see if the default service name has changed, necessitating an automatic update for (req = all_requests; req; req = req->next) if (req->terminate == regservice_termination_callback) if (req->u.servicereg.autoname && !SameDomainLabelCS(req->u.servicereg.name.c, m->nicelabel.c)) { req->u.servicereg.name = m->nicelabel; for (ptr = req->u.servicereg.instances; ptr; ptr = ptr->next) { ptr->renameonmemfree = 1; if (ptr->clientnotified) SendServiceRemovalNotification(&ptr->srs); LogInfo("udsserver_handle_configchange: Calling deregister for Service %##s", ptr->srs.RR_PTR.resrec.name->c); if (mDNS_DeregisterService_drt(m, &ptr->srs, mDNS_Dereg_rapid)) regservice_callback(m, &ptr->srs, mStatus_MemFree); // If service deregistered already, we can re-register immediately } } // Let the platform layer get the current DNS information mDNS_Lock(m); mDNSPlatformSetDNSConfig(m, mDNSfalse, mDNSfalse, mDNSNULL, &RegDomains, &BrowseDomains); mDNS_Unlock(m); // Any automatic registration domains are also implicitly automatic browsing domains if (RegDomains) SetPrefsBrowseDomains(m, RegDomains, mDNStrue); // Add the new list first if (AutoRegistrationDomains) SetPrefsBrowseDomains(m, AutoRegistrationDomains, mDNSfalse); // Then clear the old list // Add any new domains not already in our AutoRegistrationDomains list for (p=RegDomains; p; p=p->next) { DNameListElem **pp = &AutoRegistrationDomains; while (*pp && ((*pp)->uid != p->uid || !SameDomainName(&(*pp)->name, &p->name))) pp = &(*pp)->next; if (!*pp) // If not found in our existing list, this is a new default registration domain { RegisterLocalOnlyDomainEnumPTR(m, &p->name, mDNS_DomainTypeRegistration); udsserver_default_reg_domain_changed(p, mDNStrue); } else // else found same domainname in both old and new lists, so no change, just delete old copy { DNameListElem *del = *pp; *pp = (*pp)->next; mDNSPlatformMemFree(del); } } // Delete any domains in our old AutoRegistrationDomains list that are now gone while (AutoRegistrationDomains) { DNameListElem *del = AutoRegistrationDomains; AutoRegistrationDomains = AutoRegistrationDomains->next; // Cut record from list FIRST, DeregisterLocalOnlyDomainEnumPTR(m, &del->name, mDNS_DomainTypeRegistration); udsserver_default_reg_domain_changed(del, mDNSfalse); // before calling udsserver_default_reg_domain_changed() mDNSPlatformMemFree(del); } // Now we have our new updated automatic registration domain list AutoRegistrationDomains = RegDomains; // Add new browse domains to internal list if (BrowseDomains) SetPrefsBrowseDomains(m, BrowseDomains, mDNStrue); // Remove old browse domains from internal list if (SCPrefBrowseDomains) { SetPrefsBrowseDomains(m, SCPrefBrowseDomains, mDNSfalse); while (SCPrefBrowseDomains) { DNameListElem *fptr = SCPrefBrowseDomains; SCPrefBrowseDomains = SCPrefBrowseDomains->next; mDNSPlatformMemFree(fptr); } } // Replace the old browse domains array with the new array SCPrefBrowseDomains = BrowseDomains; } mDNSlocal void AutomaticBrowseDomainChange(mDNS *const m, DNSQuestion *q, const ResourceRecord *const answer, QC_result AddRecord) { (void)m; // unused; (void)q; // unused LogOperation("AutomaticBrowseDomainChange: %s automatic browse domain %##s", AddRecord ? "Adding" : "Removing", answer->rdata->u.name.c); if (AddRecord) AddAutoBrowseDomain(0, &answer->rdata->u.name); else RmvAutoBrowseDomain(0, &answer->rdata->u.name); } mDNSlocal mStatus handle_sethost_request(request_state *request) { get_flags(&request->msgptr, request->msgend); char hostName[MAX_DOMAIN_LABEL]; int len = 0; if (get_string(&request->msgptr, request->msgend, hostName, MAX_DOMAIN_LABEL) < 0) return (mStatus_BadParamErr); LogOperation("%3d: DNSSetHostname(%X, %d, nonstr ) START", request->sd, request->flags); // if we start using this as a callback for notification when the // hostname changes we may need to cleanup from it // request->terminate = sethost_termination_callback; if(hostName[0] == 0) return mStatus_BadParamErr; while (len < MAX_DOMAIN_LABEL && hostName[len+1] && hostName[len+1] != '.') len++; strncpy(&(mDNSStorage.nicelabel.c[1]), hostName, len); mDNSStorage.nicelabel.c[0] = len; strncpy(&(mDNSStorage.hostlabel.c[1]), hostName, len); mDNSStorage.hostlabel.c[0] = len; mDNS_SetFQDN(&mDNSStorage); return mStatus_NoError; } mDNSlocal mStatus handle_browse_request(request_state *request) { char regtype[MAX_ESCAPED_DOMAIN_NAME], domain[MAX_ESCAPED_DOMAIN_NAME]; domainname typedn, d, temp; mDNSs32 NumSubTypes; mStatus err = mStatus_NoError; DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend); mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend); mDNSInterfaceID InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex); if (interfaceIndex && !InterfaceID) return(mStatus_BadParamErr); if (get_string(&request->msgptr, request->msgend, regtype, MAX_ESCAPED_DOMAIN_NAME) < 0 || get_string(&request->msgptr, request->msgend, domain, MAX_ESCAPED_DOMAIN_NAME) < 0) return(mStatus_BadParamErr); if (!request->msgptr) { LogMsg("%3d: DNSServiceBrowse(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } if (domain[0] == '\0') uDNS_SetupSearchDomains(&mDNSStorage, UDNS_START_WAB_QUERY); request->flags = flags; typedn.c[0] = 0; NumSubTypes = ChopSubTypes(regtype); // Note: Modifies regtype string to remove trailing subtypes if (NumSubTypes < 0 || NumSubTypes > 1) return(mStatus_BadParamErr); if (NumSubTypes == 1 && !AppendDNSNameString(&typedn, regtype + strlen(regtype) + 1)) return(mStatus_BadParamErr); if (!regtype[0] || !AppendDNSNameString(&typedn, regtype)) return(mStatus_BadParamErr); if (!MakeDomainNameFromDNSNameString(&temp, regtype)) return(mStatus_BadParamErr); // For over-long service types, we only allow domain "local" if (temp.c[0] > 15 && domain[0] == 0) mDNSPlatformStrLCopy(domain, "local.", sizeof(domain)); // Set up browser info request->u.browser.ForceMCast = (flags & kDNSServiceFlagsForceMulticast) != 0; request->u.browser.interface_id = InterfaceID; AssignDomainName(&request->u.browser.regtype, &typedn); request->u.browser.default_domain = !domain[0]; request->u.browser.browsers = NULL; LogOperation("%3d: DNSServiceBrowse(%X, %d, \"%##s\", \"%s\") START", request->sd, request->flags, interfaceIndex, request->u.browser.regtype.c, domain); // We need to unconditionally set request->terminate, because even if we didn't successfully // start any browses right now, subsequent configuration changes may cause successful // browses to be added, and we'll need to cancel them before freeing this memory. request->terminate = browse_termination_callback; if (domain[0]) { if (!MakeDomainNameFromDNSNameString(&d, domain)) return(mStatus_BadParamErr); err = add_domain_to_browser(request, &d); #if 0 err = AuthorizedDomain(request, &d, AutoBrowseDomains) ? add_domain_to_browser(request, &d) : mStatus_NoError; #endif } else { DNameListElem *sdom; for (sdom = AutoBrowseDomains; sdom; sdom = sdom->next) if (!sdom->uid || SystemUID(request->uid) || request->uid == sdom->uid) { err = add_domain_to_browser(request, &sdom->name); if (err) { if (SameDomainName(&sdom->name, &localdomain)) break; else err = mStatus_NoError; // suppress errors for non-local "default" domains } } } return(err); } // *************************************************************************** #if COMPILER_LIKES_PRAGMA_MARK #pragma mark - #pragma mark - DNSServiceResolve #endif mDNSlocal void resolve_result_callback(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord) { size_t len = 0; char fullname[MAX_ESCAPED_DOMAIN_NAME], target[MAX_ESCAPED_DOMAIN_NAME]; char *data; reply_state *rep; request_state *req = question->QuestionContext; (void)m; // Unused LogOperation("%3d: DNSServiceResolve(%##s) %s %s", req->sd, question->qname.c, AddRecord ? "ADD" : "RMV", RRDisplayString(m, answer)); if (!AddRecord) { if (req->u.resolve.srv == answer) req->u.resolve.srv = mDNSNULL; if (req->u.resolve.txt == answer) req->u.resolve.txt = mDNSNULL; return; } if (answer->rrtype == kDNSType_SRV) req->u.resolve.srv = answer; if (answer->rrtype == kDNSType_TXT) req->u.resolve.txt = answer; if (!req->u.resolve.txt || !req->u.resolve.srv) return; // only deliver result to client if we have both answers ConvertDomainNameToCString(answer->name, fullname); ConvertDomainNameToCString(&req->u.resolve.srv->rdata->u.srv.target, target); // calculate reply length len += sizeof(DNSServiceFlags); len += sizeof(mDNSu32); // interface index len += sizeof(DNSServiceErrorType); len += strlen(fullname) + 1; len += strlen(target) + 1; len += 2 * sizeof(mDNSu16); // port, txtLen len += req->u.resolve.txt->rdlength; // allocate/init reply header rep = create_reply(resolve_reply_op, len, req); rep->rhdr->flags = dnssd_htonl(0); rep->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(m, answer->InterfaceID, mDNSfalse)); rep->rhdr->error = dnssd_htonl(kDNSServiceErr_NoError); data = (char *)&rep->rhdr[1]; // write reply data to message put_string(fullname, &data); put_string(target, &data); *data++ = req->u.resolve.srv->rdata->u.srv.port.b[0]; *data++ = req->u.resolve.srv->rdata->u.srv.port.b[1]; put_uint16(req->u.resolve.txt->rdlength, &data); put_rdata (req->u.resolve.txt->rdlength, req->u.resolve.txt->rdata->u.data, &data); LogOperation("%3d: DNSServiceResolve(%s) RESULT %s:%d", req->sd, fullname, target, mDNSVal16(req->u.resolve.srv->rdata->u.srv.port)); append_reply(req, rep); } mDNSlocal void resolve_termination_callback(request_state *request) { LogOperation("%3d: DNSServiceResolve(%##s) STOP", request->sd, request->u.resolve.qtxt.qname.c); mDNS_StopQuery(&mDNSStorage, &request->u.resolve.qtxt); mDNS_StopQuery(&mDNSStorage, &request->u.resolve.qsrv); if (request->u.resolve.external_advertise) external_stop_resolving_service(&request->u.resolve.qsrv.qname); } mDNSlocal mStatus handle_resolve_request(request_state *request) { char name[256], regtype[MAX_ESCAPED_DOMAIN_NAME], domain[MAX_ESCAPED_DOMAIN_NAME]; domainname fqdn; mStatus err; // extract the data from the message DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend); mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend); mDNSInterfaceID InterfaceID; mDNSBool wasP2P = (interfaceIndex == kDNSServiceInterfaceIndexP2P); request->flags = flags; if (wasP2P) interfaceIndex = kDNSServiceInterfaceIndexAny; InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex); if (interfaceIndex && !InterfaceID) { LogMsg("ERROR: handle_resolve_request bad interfaceIndex %d", interfaceIndex); return(mStatus_BadParamErr); } if (get_string(&request->msgptr, request->msgend, name, 256) < 0 || get_string(&request->msgptr, request->msgend, regtype, MAX_ESCAPED_DOMAIN_NAME) < 0 || get_string(&request->msgptr, request->msgend, domain, MAX_ESCAPED_DOMAIN_NAME) < 0) { LogMsg("ERROR: handle_resolve_request - Couldn't read name/regtype/domain"); return(mStatus_BadParamErr); } if (!request->msgptr) { LogMsg("%3d: DNSServiceResolve(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } if (build_domainname_from_strings(&fqdn, name, regtype, domain) < 0) { LogMsg("ERROR: handle_resolve_request bad “%s” “%s” “%s”", name, regtype, domain); return(mStatus_BadParamErr); } mDNSPlatformMemZero(&request->u.resolve, sizeof(request->u.resolve)); // format questions request->u.resolve.qsrv.InterfaceID = InterfaceID; request->u.resolve.qsrv.Target = zeroAddr; AssignDomainName(&request->u.resolve.qsrv.qname, &fqdn); request->u.resolve.qsrv.qtype = kDNSType_SRV; request->u.resolve.qsrv.qclass = kDNSClass_IN; request->u.resolve.qsrv.LongLived = (flags & kDNSServiceFlagsLongLivedQuery ) != 0; request->u.resolve.qsrv.ExpectUnique = mDNStrue; request->u.resolve.qsrv.ForceMCast = (flags & kDNSServiceFlagsForceMulticast ) != 0; request->u.resolve.qsrv.ReturnIntermed = (flags & kDNSServiceFlagsReturnIntermediates) != 0; request->u.resolve.qsrv.SuppressUnusable = mDNSfalse; request->u.resolve.qsrv.SearchListIndex = 0; request->u.resolve.qsrv.AppendSearchDomains = 0; request->u.resolve.qsrv.RetryWithSearchDomains = mDNSfalse; request->u.resolve.qsrv.TimeoutQuestion = 0; request->u.resolve.qsrv.WakeOnResolve = (flags & kDNSServiceFlagsWakeOnResolve) != 0; request->u.resolve.qsrv.qnameOrig = mDNSNULL; request->u.resolve.qsrv.QuestionCallback = resolve_result_callback; request->u.resolve.qsrv.QuestionContext = request; request->u.resolve.qtxt.InterfaceID = InterfaceID; request->u.resolve.qtxt.Target = zeroAddr; AssignDomainName(&request->u.resolve.qtxt.qname, &fqdn); request->u.resolve.qtxt.qtype = kDNSType_TXT; request->u.resolve.qtxt.qclass = kDNSClass_IN; request->u.resolve.qtxt.LongLived = (flags & kDNSServiceFlagsLongLivedQuery ) != 0; request->u.resolve.qtxt.ExpectUnique = mDNStrue; request->u.resolve.qtxt.ForceMCast = (flags & kDNSServiceFlagsForceMulticast ) != 0; request->u.resolve.qtxt.ReturnIntermed = (flags & kDNSServiceFlagsReturnIntermediates) != 0; request->u.resolve.qtxt.SuppressUnusable = mDNSfalse; request->u.resolve.qtxt.SearchListIndex = 0; request->u.resolve.qtxt.AppendSearchDomains = 0; request->u.resolve.qtxt.RetryWithSearchDomains = mDNSfalse; request->u.resolve.qtxt.TimeoutQuestion = 0; request->u.resolve.qtxt.WakeOnResolve = 0; request->u.resolve.qtxt.qnameOrig = mDNSNULL; request->u.resolve.qtxt.QuestionCallback = resolve_result_callback; request->u.resolve.qtxt.QuestionContext = request; request->u.resolve.ReportTime = NonZeroTime(mDNS_TimeNow(&mDNSStorage) + 130 * mDNSPlatformOneSecond); request->u.resolve.external_advertise = mDNSfalse; #if 0 if (!AuthorizedDomain(request, &fqdn, AutoBrowseDomains)) return(mStatus_NoError); #endif // ask the questions LogOperation("%3d: DNSServiceResolve(%##s) START", request->sd, request->u.resolve.qsrv.qname.c); err = mDNS_StartQuery(&mDNSStorage, &request->u.resolve.qsrv); if (!err) { err = mDNS_StartQuery(&mDNSStorage, &request->u.resolve.qtxt); if (err) mDNS_StopQuery(&mDNSStorage, &request->u.resolve.qsrv); else { request->terminate = resolve_termination_callback; // If the user explicitly passed in P2P, we don't restrict the domain in which we resolve. if (wasP2P || (!InterfaceID && IsLocalDomain(&fqdn) && (request->flags & kDNSServiceFlagsIncludeP2P))) { request->u.resolve.external_advertise = mDNStrue; LogInfo("handle_resolve_request: calling external_start_resolving_service()"); external_start_resolving_service(&fqdn); } } } return(err); } // *************************************************************************** #if COMPILER_LIKES_PRAGMA_MARK #pragma mark - #pragma mark - DNSServiceQueryRecord #endif // mDNS operation functions. Each operation has 3 associated functions - a request handler that parses // the client's request and makes the appropriate mDNSCore call, a result handler (passed as a callback // to the mDNSCore routine) that sends results back to the client, and a termination routine that aborts // the mDNSCore operation if the client dies or closes its socket. // Returns -1 to tell the caller that it should not try to reissue the query anymore // Returns 1 on successfully appending a search domain and the caller should reissue the new query // Returns 0 when there are no more search domains and the caller should reissue the query mDNSlocal int AppendNewSearchDomain(mDNS *const m, DNSQuestion *question) { domainname *sd; mStatus err; // Sanity check: The caller already checks this. We use -1 to indicate that we have searched all // the domains and should try the single label query directly on the wire. if (question->SearchListIndex == -1) { LogMsg("AppendNewSearchDomain: question %##s (%s) SearchListIndex is -1", question->qname.c, DNSTypeName(question->qtype)); return -1; } if (!question->AppendSearchDomains) { LogMsg("AppendNewSearchDomain: question %##s (%s) AppendSearchDoamins is 0", question->qname.c, DNSTypeName(question->qtype)); return -1; } // Save the original name, before we modify them below. if (!question->qnameOrig) { question->qnameOrig = mallocL("AppendNewSearchDomain", sizeof(domainname)); if (!question->qnameOrig) { LogMsg("AppendNewSearchDomain: ERROR!! malloc failure"); return -1; } question->qnameOrig->c[0] = 0; AssignDomainName(question->qnameOrig, &question->qname); LogInfo("AppendSearchDomain: qnameOrig %##s", question->qnameOrig->c); } sd = uDNS_GetNextSearchDomain(m, question->InterfaceID, &question->SearchListIndex, !question->AppendLocalSearchDomains); // We use -1 to indicate that we have searched all the domains and should try the single label // query directly on the wire. uDNS_GetNextSearchDomain should never return a negative value if (question->SearchListIndex == -1) { LogMsg("AppendNewSearchDomain: ERROR!! uDNS_GetNextSearchDomain returned -1"); return -1; } // Not a common case. Perhaps, we should try the next search domain if it exceeds ? if (sd && (DomainNameLength(question->qnameOrig) + DomainNameLength(sd)) > MAX_DOMAIN_NAME) { LogMsg("AppendNewSearchDomain: ERROR!! exceeding max domain length for %##s (%s) SearchDomain %##s length %d, Question name length %d", question->qnameOrig->c, DNSTypeName(question->qtype), sd->c, DomainNameLength(question->qnameOrig), DomainNameLength(sd)); return -1; } // if there are no more search domains and we have already tried this question // without appending search domains, then we are done. if (!sd && !ApplySearchDomainsFirst(question)) { LogInfo("AppnedNewSearchDomain: No more search domains for question with name %##s (%s), not trying anymore", question->qname.c, DNSTypeName(question->qtype)); return -1; } // Stop the question before changing the name as negative cache entries could be pointing at this question. // Even if we don't change the question in the case of returning 0, the caller is going to restart the // question. err = mDNS_StopQuery(&mDNSStorage, question); if (err) { LogMsg("AppendNewSearchDomain: ERROR!! %##s %s mDNS_StopQuery: %d, while retrying with search domains", question->qname.c, DNSTypeName(question->qtype), (int)err); } AssignDomainName(&question->qname, question->qnameOrig); if (sd) { AppendDomainName(&question->qname, sd); LogInfo("AppnedNewSearchDomain: Returning question with name %##s, SearchListIndex %d", question->qname.c, question->SearchListIndex); return 1; } // Try the question as single label LogInfo("AppnedNewSearchDomain: No more search domains for question with name %##s (%s), trying one last time", question->qname.c, DNSTypeName(question->qtype)); return 0; } #if APPLE_OSX_mDNSResponder mDNSlocal mDNSBool DomainInSearchList(domainname *domain) { const SearchListElem *s; for (s=SearchList; s; s=s->next) if (SameDomainName(&s->domain, domain)) return mDNStrue; return mDNSfalse; } // Workaround for networks using Microsoft Active Directory using "local" as a private internal // top-level domain mDNSlocal mStatus SendAdditionalQuery(DNSQuestion *q, request_state *request, mStatus err) { extern domainname ActiveDirectoryPrimaryDomain; DNSQuestion **question2; #define VALID_MSAD_SRV_TRANSPORT(T) (SameDomainLabel((T)->c, (const mDNSu8 *)"\x4_tcp") || SameDomainLabel((T)->c, (const mDNSu8 *)"\x4_udp")) #define VALID_MSAD_SRV(Q) ((Q)->qtype == kDNSType_SRV && VALID_MSAD_SRV_TRANSPORT(SecondLabel(&(Q)->qname))) question2 = mDNSNULL; if (request->hdr.op == query_request) question2 = &request->u.queryrecord.q2; else if (request->hdr.op == addrinfo_request) { if (q->qtype == kDNSType_A) question2 = &request->u.addrinfo.q42; else if (q->qtype == kDNSType_AAAA) question2 = &request->u.addrinfo.q62; } if (!question2) { LogMsg("SendAdditionalQuery: question2 NULL for %##s (%s)", q->qname.c, DNSTypeName(q->qtype)); return mStatus_BadParamErr; } // Sanity check: If we already sent an additonal query, we don't need to send one more. // // 1. When the application calls DNSServiceQueryRecord or DNSServiceGetAddrInfo with a .local name, this function // is called to see whether a unicast query should be sent or not. // // 2. As a result of appending search domains, the question may be end up with a .local suffix even though it // was not a .local name to start with. In that case, queryrecord_result_callback calls this function to // send the additional query. // // Thus, it should not be called more than once. if (*question2) { LogInfo("SendAdditionalQuery: question2 already sent for %##s (%s), no more q2", q->qname.c, DNSTypeName(q->qtype)); return err; } if (!q->ForceMCast && SameDomainLabel(LastLabel(&q->qname), (const mDNSu8 *)&localdomain)) if (q->qtype == kDNSType_A || q->qtype == kDNSType_AAAA || VALID_MSAD_SRV(q)) { DNSQuestion *q2; int labels = CountLabels(&q->qname); q2 = mallocL("DNSQuestion", sizeof(DNSQuestion)); if (!q2) FatalError("ERROR: SendAdditionalQuery malloc"); *question2 = q2; *q2 = *q; q2->InterfaceID = mDNSInterface_Unicast; q2->ExpectUnique = mDNStrue; // If the query starts as a single label e.g., somehost, and we have search domains with .local, // queryrecord_result_callback calls this function when .local is appended to "somehost". // At that time, the name in "q" is pointing at somehost.local and its qnameOrig pointing at // "somehost". We need to copy that information so that when we retry with a different search // domain e.g., mycompany.local, we get "somehost.mycompany.local". if (q->qnameOrig) { (*question2)->qnameOrig = mallocL("SendAdditionalQuery", DomainNameLength(q->qnameOrig)); if (!(*question2)->qnameOrig) { LogMsg("SendAdditionalQuery: ERROR!! malloc failure"); return mStatus_NoMemoryErr; } (*question2)->qnameOrig->c[0] = 0; AssignDomainName((*question2)->qnameOrig, q->qnameOrig); LogInfo("SendAdditionalQuery: qnameOrig %##s", (*question2)->qnameOrig->c); } // For names of the form ".bar.local." we always do a second unicast query in parallel. // For names of the form ".local." it's less clear whether we should do a unicast query. // If the name being queried is exactly the same as the name in the DHCP "domain" option (e.g. the DHCP // "domain" is my-small-company.local, and the user types "my-small-company.local" into their web browser) // then that's a hint that it's worth doing a unicast query. Otherwise, we first check to see if the // site's DNS server claims there's an SOA record for "local", and if so, that's also a hint that queries // for names in the "local" domain will be safely answered privately before they hit the root name servers. // Note that in the "my-small-company.local" example above there will typically be an SOA record for // "my-small-company.local" but *not* for "local", which is why the "local SOA" check would fail in that case. // We need to check against both ActiveDirectoryPrimaryDomain and SearchList. If it matches against either // of those, we don't want do the SOA check for the local if (labels == 2 && !SameDomainName(&q->qname, &ActiveDirectoryPrimaryDomain) && !DomainInSearchList(&q->qname)) { AssignDomainName(&q2->qname, &localdomain); q2->qtype = kDNSType_SOA; q2->LongLived = mDNSfalse; q2->ForceMCast = mDNSfalse; q2->ReturnIntermed = mDNStrue; // Don't append search domains for the .local SOA query q2->AppendSearchDomains = 0; q2->AppendLocalSearchDomains = 0; q2->RetryWithSearchDomains = mDNSfalse; q2->SearchListIndex = 0; q2->TimeoutQuestion = 0; } LogOperation("%3d: DNSServiceQueryRecord(%##s, %s) unicast", request->sd, q2->qname.c, DNSTypeName(q2->qtype)); err = mDNS_StartQuery(&mDNSStorage, q2); if (err) LogMsg("%3d: ERROR: DNSServiceQueryRecord %##s %s mDNS_StartQuery: %d", request->sd, q2->qname.c, DNSTypeName(q2->qtype), (int)err); } return(err); } #endif // APPLE_OSX_mDNSResponder // This function tries to append a search domain if valid and possible. If so, returns true. mDNSlocal mDNSBool RetryQuestionWithSearchDomains(mDNS *const m, DNSQuestion *question, request_state *req) { int result; // RetryWithSearchDomains tells the core to call us back so that we can retry with search domains if there is no // answer in the cache or /etc/hosts. In the first call back from the core, we clear RetryWithSearchDomains so // that we don't get called back repeatedly. If we got an answer from the cache or /etc/hosts, we don't touch // RetryWithSearchDomains which may or may not be set. // // If we get e.g., NXDOMAIN and the query is neither suppressed nor exhausted the domain search list and // is a valid question for appending search domains, retry by appending domains if (!question->SuppressQuery && question->SearchListIndex != -1 && question->AppendSearchDomains) { question->RetryWithSearchDomains = 0; result = AppendNewSearchDomain(m, question); // As long as the result is either zero or 1, we retry the question. If we exahaust the search // domains (result is zero) we try the original query (as it was before appending the search // domains) as such on the wire as a last resort if we have not tried them before. For queries // with more than one label, we have already tried them before appending search domains and // hence don't retry again if (result != -1) { mStatus err; err = mDNS_StartQuery(m, question); if (!err) { LogOperation("%3d: RetryQuestionWithSearchDomains(%##s, %s), retrying after appending search domain", req->sd, question->qname.c, DNSTypeName(question->qtype)); // If the result was zero, it meant that there are no search domains and we just retried the question // as a single label and we should not retry with search domains anymore. if (!result) question->SearchListIndex = -1; return mDNStrue; } else { LogMsg("%3d: ERROR: RetryQuestionWithSearchDomains %##s %s mDNS_StartQuery: %d, while retrying with search domains", req->sd, question->qname.c, DNSTypeName(question->qtype), (int)err); // We have already stopped the query and could not restart. Reset the appropriate pointers // so that we don't call stop again when the question terminates question->QuestionContext = mDNSNULL; } } } else { LogInfo("%3d: RetryQuestionWithSearchDomains: Not appending search domains - SuppressQuery %d, SearchListIndex %d, AppendSearchDomains %d", req->sd, question->SuppressQuery, question->SearchListIndex, question->AppendSearchDomains); } return mDNSfalse; } mDNSlocal void queryrecord_result_callback(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord) { char name[MAX_ESCAPED_DOMAIN_NAME]; request_state *req = question->QuestionContext; reply_state *rep; char *data; size_t len; DNSServiceErrorType error = kDNSServiceErr_NoError; DNSQuestion *q = mDNSNULL; #if APPLE_OSX_mDNSResponder { // Sanity check: QuestionContext is set to NULL after we stop the question and hence we should not // get any callbacks from the core after this. if (!req) { LogMsg("queryrecord_result_callback: ERROR!! QuestionContext NULL for %##s (%s)", question->qname.c, DNSTypeName(question->qtype)); return; } if (req->hdr.op == query_request && question == req->u.queryrecord.q2) q = &req->u.queryrecord.q; else if (req->hdr.op == addrinfo_request && question == req->u.addrinfo.q42) q = &req->u.addrinfo.q4; else if (req->hdr.op == addrinfo_request && question == req->u.addrinfo.q62) q = &req->u.addrinfo.q6; if (q && question->qtype != q->qtype && !SameDomainName(&question->qname, &q->qname)) { mStatus err; domainname *orig = question->qnameOrig; LogInfo("queryrecord_result_callback: Stopping q2 local %##s", question->qname.c); mDNS_StopQuery(m, question); question->QuestionContext = mDNSNULL; // We got a negative response for the SOA record indicating that .local does not exist. // But we might have other search domains (that does not end in .local) that can be // appended to this question. In that case, we want to retry the question. Otherwise, // we don't want to try this question as unicast. if (answer->RecordType == kDNSRecordTypePacketNegative && !q->AppendSearchDomains) { LogInfo("queryrecord_result_callback: question %##s AppendSearchDomains zero", q->qname.c); return; } // If we got a non-negative answer for our "local SOA" test query, start an additional parallel unicast query // // Note: When we copy the original question, we copy everything including the AppendSearchDomains, // RetryWithSearchDomains except for qnameOrig which can be non-NULL if the original question is // e.g., somehost and then we appended e.g., ".local" and retried that question. See comment in // SendAdditionalQuery as to how qnameOrig gets initialized. *question = *q; question->InterfaceID = mDNSInterface_Unicast; question->ExpectUnique = mDNStrue; question->qnameOrig = orig; LogOperation("%3d: DNSServiceQueryRecord(%##s, %s) unicast, context %p", req->sd, question->qname.c, DNSTypeName(question->qtype), question->QuestionContext); // If the original question timed out, its QuestionContext would already be set to NULL and that's what we copied above. // Hence, we need to set it explicitly here. question->QuestionContext = req; err = mDNS_StartQuery(m, question); if (err) LogMsg("%3d: ERROR: queryrecord_result_callback %##s %s mDNS_StartQuery: %d", req->sd, question->qname.c, DNSTypeName(question->qtype), (int)err); // If we got a positive response to local SOA, then try the .local question as unicast if (answer->RecordType != kDNSRecordTypePacketNegative) return; // Fall through and get the next search domain. The question is pointing at .local // and we don't want to try that. Try the next search domain. Don't try with local // search domains for the unicast question anymore. // // Note: we started the question above which will be stopped immediately (never sent on the wire) // before we pick the next search domain below. RetryQuestionWithSearchDomains assumes that the // question has already started. question->AppendLocalSearchDomains = 0; } if (q && AddRecord && (question->InterfaceID == mDNSInterface_Unicast) && !answer->rdlength) { // If we get a negative response to the unicast query that we sent above, retry after appending search domains // Note: We could have appended search domains below (where do it for regular unicast questions) instead of doing it here. // As we ignore negative unicast answers below, we would never reach the code where the search domains are appended. // To keep things simple, we handle unicast ".local" separately here. LogInfo("queryrecord_result_callback: Retrying .local question %##s (%s) as unicast after appending search domains", question->qname.c, DNSTypeName(question->qtype)); if (RetryQuestionWithSearchDomains(m, question, req)) return; if (question->AppendSearchDomains && !question->AppendLocalSearchDomains && IsLocalDomain(&question->qname)) { // If "local" is the last search domain, we need to stop the question so that we don't send the "local" // question on the wire as we got a negative response for the local SOA. But, we can't stop the question // yet as we may have to timeout the question (done by the "core") for which we need to leave the question // in the list. We leave it disabled so that it does not hit the wire. LogInfo("queryrecord_result_callback: Disabling .local question %##s (%s)", question->qname.c, DNSTypeName(question->qtype)); question->ThisQInterval = 0; } } // If we are here it means that either "question" is not "q2" OR we got a positive response for "q2" OR we have no more search // domains to append for "q2". In all cases, fall through and deliver the response } #endif // APPLE_OSX_mDNSResponder if (answer->RecordType == kDNSRecordTypePacketNegative) { // If this question needs to be timed out and we have reached the stop time, mark // the error as timeout. It is possible that we might get a negative response from an // external DNS server at the same time when this question reaches its stop time. We // can't tell the difference as there is no indication in the callback. This should // be okay as we will be timing out this query anyway. mDNS_Lock(m); if (question->TimeoutQuestion) { if ((m->timenow - question->StopTime) >= 0) { LogInfo("queryrecord_result_callback:Question %##s (%s) timing out, InterfaceID %p", question->qname.c, DNSTypeName(question->qtype), question->InterfaceID); error = kDNSServiceErr_Timeout; } } mDNS_Unlock(m); // When we're doing parallel unicast and multicast queries for dot-local names (for supporting Microsoft // Active Directory sites) we need to ignore negative unicast answers. Otherwise we'll generate negative // answers for just about every single multicast name we ever look up, since the Microsoft Active Directory // server is going to assert that pretty much every single multicast name doesn't exist. // // If we are timing out this query, we need to deliver the negative answer to the application if (error != kDNSServiceErr_Timeout) { if (!answer->InterfaceID && IsLocalDomain(answer->name)) { LogInfo("queryrecord_result_callback:Question %##s (%s) answering local with unicast", question->qname.c, DNSTypeName(question->qtype)); return; } error = kDNSServiceErr_NoSuchRecord; } AddRecord = mDNStrue; } // If we get a negative answer, try appending search domains. Don't append search domains // - if we are timing out this question // - if the negative response was received as a result of a multicast query // - if this is an additional query (q2), we already appended search domains above (indicated by "!q" below) if (error != kDNSServiceErr_Timeout) { if (!q && !answer->InterfaceID && !answer->rdlength && AddRecord) { // If the original question did not end in .local, we did not send an SOA query // to figure out whether we should send an additional unicast query or not. If we just // appended .local, we need to see if we need to send an additional query. This should // normally happen just once because after we append .local, we ignore all negative // responses for .local above. LogInfo("queryrecord_result_callback: Retrying question %##s (%s) after appending search domains", question->qname.c, DNSTypeName(question->qtype)); if (RetryQuestionWithSearchDomains(m, question, req)) { // Note: We need to call SendAdditionalQuery every time after appending a search domain as .local could // be anywhere in the search domain list. #if APPLE_OSX_mDNSResponder mStatus err = mStatus_NoError; err = SendAdditionalQuery(question, req, err); if (err) LogMsg("queryrecord_result_callback: Sending .local SOA query failed, after appending domains"); #endif // APPLE_OSX_mDNSResponder return; } } } ConvertDomainNameToCString(answer->name, name); LogOperation("%3d: %s(%##s, %s) %s %s", req->sd, req->hdr.op == query_request ? "DNSServiceQueryRecord" : "DNSServiceGetAddrInfo", question->qname.c, DNSTypeName(question->qtype), AddRecord ? "ADD" : "RMV", RRDisplayString(m, answer)); len = sizeof(DNSServiceFlags); // calculate reply data length len += sizeof(mDNSu32); // interface index len += sizeof(DNSServiceErrorType); len += strlen(name) + 1; len += 3 * sizeof(mDNSu16); // type, class, rdlen len += answer->rdlength; len += sizeof(mDNSu32); // TTL rep = create_reply(req->hdr.op == query_request ? query_reply_op : addrinfo_reply_op, len, req); rep->rhdr->flags = dnssd_htonl(AddRecord ? kDNSServiceFlagsAdd : 0); // Call mDNSPlatformInterfaceIndexfromInterfaceID, but suppressNetworkChange (last argument). Otherwise, if the // InterfaceID is not valid, then it simulates a "NetworkChanged" which in turn makes questions // to be stopped and started including *this* one. Normally the InterfaceID is valid. But when we // are using the /etc/hosts entries to answer a question, the InterfaceID may not be known to the // mDNS core . Eventually, we should remove the calls to "NetworkChanged" in // mDNSPlatformInterfaceIndexfromInterfaceID when it can't find InterfaceID as ResourceRecords // should not have existed to answer this question if the corresponding interface is not valid. rep->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(m, answer->InterfaceID, mDNStrue)); rep->rhdr->error = dnssd_htonl(error); data = (char *)&rep->rhdr[1]; put_string(name, &data); put_uint16(answer->rrtype, &data); put_uint16(answer->rrclass, &data); put_uint16(answer->rdlength, &data); // We need to use putRData here instead of the crude put_rdata function, because the crude put_rdata // function just does a blind memory copy without regard to structures that may have holes in them. if (answer->rdlength) if (!putRData(mDNSNULL, (mDNSu8 *)data, (mDNSu8 *)rep->rhdr + len, answer)) LogMsg("queryrecord_result_callback putRData failed %d", (mDNSu8 *)rep->rhdr + len - (mDNSu8 *)data); data += answer->rdlength; put_uint32(AddRecord ? answer->rroriginalttl : 0, &data); append_reply(req, rep); // Stop the question, if we just timed out if (error == kDNSServiceErr_Timeout) { mDNS_StopQuery(m, question); // Reset the pointers so that we don't call stop on termination question->QuestionContext = mDNSNULL; } #if APPLE_OSX_mDNSResponder #if ! NO_WCF CHECK_WCF_FUNCTION(WCFIsServerRunning) { struct xucred x; socklen_t xucredlen = sizeof(x); if (WCFIsServerRunning((WCFConnection *)m->WCF) && answer->rdlength != 0) { if (getsockopt(req->sd, 0, LOCAL_PEERCRED, &x, &xucredlen) >= 0 && (x.cr_version == XUCRED_VERSION)) { struct sockaddr_storage addr; const RDataBody2 *const rdb = (RDataBody2 *)answer->rdata->u.data; addr.ss_len = 0; if (answer->rrtype == kDNSType_A || answer->rrtype == kDNSType_AAAA) { if (answer->rrtype == kDNSType_A) { struct sockaddr_in *sin = (struct sockaddr_in *)&addr; sin->sin_port = 0; if (!putRData(mDNSNULL, (mDNSu8 *)&sin->sin_addr, (mDNSu8 *)(&sin->sin_addr + sizeof(rdb->ipv4)), answer)) LogMsg("queryrecord_result_callback: WCF AF_INET putRData failed"); else { addr.ss_len = sizeof (struct sockaddr_in); addr.ss_family = AF_INET; } } else if (answer->rrtype == kDNSType_AAAA) { struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&addr; sin6->sin6_port = 0; if (!putRData(mDNSNULL, (mDNSu8 *)&sin6->sin6_addr, (mDNSu8 *)(&sin6->sin6_addr + sizeof(rdb->ipv6)), answer)) LogMsg("queryrecord_result_callback: WCF AF_INET6 putRData failed"); else { addr.ss_len = sizeof (struct sockaddr_in6); addr.ss_family = AF_INET6; } } if (addr.ss_len) { debugf("queryrecord_result_callback: Name %s, uid %u, addr length %d", name, x.cr_uid, addr.ss_len); CHECK_WCF_FUNCTION((WCFConnection *)WCFNameResolvesToAddr) { WCFNameResolvesToAddr(m->WCF, name, (struct sockaddr *)&addr, x.cr_uid); } } } else if (answer->rrtype == kDNSType_CNAME) { domainname cname; char cname_cstr[MAX_ESCAPED_DOMAIN_NAME]; if (!putRData(mDNSNULL, cname.c, (mDNSu8 *)(cname.c + MAX_DOMAIN_NAME), answer)) LogMsg("queryrecord_result_callback: WCF CNAME putRData failed"); else { ConvertDomainNameToCString(&cname, cname_cstr); CHECK_WCF_FUNCTION((WCFConnection *)WCFNameResolvesToAddr) { WCFNameResolvesToName(m->WCF, name, cname_cstr, x.cr_uid); } } } } else my_perror("queryrecord_result_callback: ERROR: getsockopt LOCAL_PEERCRED"); } } #endif #endif } mDNSlocal void queryrecord_termination_callback(request_state *request) { LogOperation("%3d: DNSServiceQueryRecord(%##s, %s) STOP", request->sd, request->u.queryrecord.q.qname.c, DNSTypeName(request->u.queryrecord.q.qtype)); if (request->u.queryrecord.q.QuestionContext) { mDNS_StopQuery(&mDNSStorage, &request->u.queryrecord.q); // no need to error check request->u.queryrecord.q.QuestionContext = mDNSNULL; } else { DNSQuestion *question = &request->u.queryrecord.q; LogInfo("queryrecord_termination_callback: question %##s (%s) already stopped, InterfaceID %p", question->qname.c, DNSTypeName(question->qtype), question->InterfaceID); } if (request->u.queryrecord.q.qnameOrig) { freeL("QueryTermination", request->u.queryrecord.q.qnameOrig); request->u.queryrecord.q.qnameOrig = mDNSNULL; } if (request->u.queryrecord.q.InterfaceID == mDNSInterface_P2P || (!request->u.queryrecord.q.InterfaceID && SameDomainName((const domainname *)LastLabel(&request->u.queryrecord.q.qname), &localdomain) && (request->flags & kDNSServiceFlagsIncludeP2P))) { LogInfo("queryrecord_termination_callback: calling external_stop_browsing_for_service()"); external_stop_browsing_for_service(&mDNSStorage, &request->u.queryrecord.q.qname, request->u.queryrecord.q.qtype); } if (request->u.queryrecord.q2) { if (request->u.queryrecord.q2->QuestionContext) { LogInfo("queryrecord_termination_callback: Stopping q2 %##s", request->u.queryrecord.q2->qname.c); mDNS_StopQuery(&mDNSStorage, request->u.queryrecord.q2); } else { DNSQuestion *question = request->u.queryrecord.q2; LogInfo("queryrecord_termination_callback: q2 %##s (%s) already stopped, InterfaceID %p", question->qname.c, DNSTypeName(question->qtype), question->InterfaceID); } if (request->u.queryrecord.q2->qnameOrig) { LogInfo("queryrecord_termination_callback: freeing q2 qnameOrig %##s", request->u.queryrecord.q2->qnameOrig->c); freeL("QueryTermination q2", request->u.queryrecord.q2->qnameOrig); request->u.queryrecord.q2->qnameOrig = mDNSNULL; } freeL("queryrecord Q2", request->u.queryrecord.q2); request->u.queryrecord.q2 = mDNSNULL; } } mDNSlocal mStatus handle_queryrecord_request(request_state *request) { DNSQuestion *const q = &request->u.queryrecord.q; char name[256]; mDNSu16 rrtype, rrclass; mStatus err; DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend); mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend); mDNSInterfaceID InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex); if (interfaceIndex && !InterfaceID) return(mStatus_BadParamErr); if (get_string(&request->msgptr, request->msgend, name, 256) < 0) return(mStatus_BadParamErr); rrtype = get_uint16(&request->msgptr, request->msgend); rrclass = get_uint16(&request->msgptr, request->msgend); if (!request->msgptr) { LogMsg("%3d: DNSServiceQueryRecord(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } request->flags = flags; mDNSPlatformMemZero(&request->u.queryrecord, sizeof(request->u.queryrecord)); q->InterfaceID = InterfaceID; q->Target = zeroAddr; if (!MakeDomainNameFromDNSNameString(&q->qname, name)) return(mStatus_BadParamErr); #if 0 if (!AuthorizedDomain(request, &q->qname, AutoBrowseDomains)) return (mStatus_NoError); #endif q->qtype = rrtype; q->qclass = rrclass; q->LongLived = (flags & kDNSServiceFlagsLongLivedQuery ) != 0; q->ExpectUnique = mDNSfalse; q->ForceMCast = (flags & kDNSServiceFlagsForceMulticast ) != 0; q->ReturnIntermed = (flags & kDNSServiceFlagsReturnIntermediates) != 0; q->SuppressUnusable = (flags & kDNSServiceFlagsSuppressUnusable ) != 0; q->TimeoutQuestion = (flags & kDNSServiceFlagsTimeout ) != 0; q->WakeOnResolve = 0; q->QuestionCallback = queryrecord_result_callback; q->QuestionContext = request; q->SearchListIndex = 0; // Don't append search domains for fully qualified domain names including queries // such as e.g., "abc." that has only one label. We convert all names to FQDNs as internally // we only deal with FQDNs. Hence, we cannot look at qname to figure out whether we should // append search domains or not. So, we record that information in AppendSearchDomains. // // We append search domains only for queries that are a single label. If overriden using // command line argument "AlwaysAppendSearchDomains", then we do it for any query which // is not fully qualified. if ((rrtype == kDNSType_A || rrtype == kDNSType_AAAA) && name[strlen(name) - 1] != '.' && (AlwaysAppendSearchDomains || CountLabels(&q->qname) == 1)) { q->AppendSearchDomains = 1; q->AppendLocalSearchDomains = 1; } else { q->AppendSearchDomains = 0; q->AppendLocalSearchDomains = 0; } // For single label queries that are not fully qualified, look at /etc/hosts, cache and try // search domains before trying them on the wire as a single label query. RetryWithSearchDomains // tell the core to call back into the UDS layer if there is no valid response in /etc/hosts or // the cache q->RetryWithSearchDomains = ApplySearchDomainsFirst(q) ? 1 : 0; q->qnameOrig = mDNSNULL; LogOperation("%3d: DNSServiceQueryRecord(%X, %d, %##s, %s) START", request->sd, flags, interfaceIndex, q->qname.c, DNSTypeName(q->qtype)); err = mDNS_StartQuery(&mDNSStorage, q); if (err) LogMsg("%3d: ERROR: DNSServiceQueryRecord %##s %s mDNS_StartQuery: %d", request->sd, q->qname.c, DNSTypeName(q->qtype), (int)err); else { request->terminate = queryrecord_termination_callback; if (q->InterfaceID == mDNSInterface_P2P || (!q->InterfaceID && SameDomainName((const domainname *)LastLabel(&q->qname), &localdomain) && (flags & kDNSServiceFlagsIncludeP2P))) { LogInfo("handle_queryrecord_request: calling external_start_browsing_for_service()"); external_start_browsing_for_service(&mDNSStorage, &q->qname, q->qtype); } } #if APPLE_OSX_mDNSResponder err = SendAdditionalQuery(q, request, err); #endif // APPLE_OSX_mDNSResponder return(err); } // *************************************************************************** #if COMPILER_LIKES_PRAGMA_MARK #pragma mark - #pragma mark - DNSServiceEnumerateDomains #endif mDNSlocal reply_state *format_enumeration_reply(request_state *request, const char *domain, DNSServiceFlags flags, mDNSu32 ifi, DNSServiceErrorType err) { size_t len; reply_state *reply; char *data; len = sizeof(DNSServiceFlags); len += sizeof(mDNSu32); len += sizeof(DNSServiceErrorType); len += strlen(domain) + 1; reply = create_reply(enumeration_reply_op, len, request); reply->rhdr->flags = dnssd_htonl(flags); reply->rhdr->ifi = dnssd_htonl(ifi); reply->rhdr->error = dnssd_htonl(err); data = (char *)&reply->rhdr[1]; put_string(domain, &data); return reply; } mDNSlocal void enum_termination_callback(request_state *request) { mDNS_StopGetDomains(&mDNSStorage, &request->u.enumeration.q_all); mDNS_StopGetDomains(&mDNSStorage, &request->u.enumeration.q_default); } mDNSlocal void enum_result_callback(mDNS *const m, DNSQuestion *const question, const ResourceRecord *const answer, QC_result AddRecord) { char domain[MAX_ESCAPED_DOMAIN_NAME]; request_state *request = question->QuestionContext; DNSServiceFlags flags = 0; reply_state *reply; (void)m; // Unused if (answer->rrtype != kDNSType_PTR) return; #if 0 if (!AuthorizedDomain(request, &answer->rdata->u.name, request->u.enumeration.flags ? AutoRegistrationDomains : AutoBrowseDomains)) return; #endif // We only return add/remove events for the browse and registration lists // For the default browse and registration answers, we only give an "ADD" event if (question == &request->u.enumeration.q_default && !AddRecord) return; if (AddRecord) { flags |= kDNSServiceFlagsAdd; if (question == &request->u.enumeration.q_default) flags |= kDNSServiceFlagsDefault; } ConvertDomainNameToCString(&answer->rdata->u.name, domain); // Note that we do NOT propagate specific interface indexes to the client - for example, a domain we learn from // a machine's system preferences may be discovered on the LocalOnly interface, but should be browsed on the // network, so we just pass kDNSServiceInterfaceIndexAny reply = format_enumeration_reply(request, domain, flags, kDNSServiceInterfaceIndexAny, kDNSServiceErr_NoError); if (!reply) { LogMsg("ERROR: enum_result_callback, format_enumeration_reply"); return; } LogOperation("%3d: DNSServiceEnumerateDomains(%#2s) RESULT %s: %s", request->sd, question->qname.c, AddRecord ? "Add" : "Rmv", domain); append_reply(request, reply); } mDNSlocal mStatus handle_enum_request(request_state *request) { mStatus err; DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend); DNSServiceFlags reg = flags & kDNSServiceFlagsRegistrationDomains; mDNS_DomainType t_all = reg ? mDNS_DomainTypeRegistration : mDNS_DomainTypeBrowse; mDNS_DomainType t_default = reg ? mDNS_DomainTypeRegistrationDefault : mDNS_DomainTypeBrowseDefault; mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend); mDNSInterfaceID InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex); if (interfaceIndex && !InterfaceID) return(mStatus_BadParamErr); if (!request->msgptr) { LogMsg("%3d: DNSServiceEnumerateDomains(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } // allocate context structures uDNS_SetupSearchDomains(&mDNSStorage, UDNS_START_WAB_QUERY); #if 0 // mark which kind of enumeration we're doing so we can (de)authorize certain domains request->u.enumeration.flags = reg; #endif // enumeration requires multiple questions, so we must link all the context pointers so that // necessary context can be reached from the callbacks request->u.enumeration.q_all .QuestionContext = request; request->u.enumeration.q_default.QuestionContext = request; // if the caller hasn't specified an explicit interface, we use local-only to get the system-wide list. if (!InterfaceID) InterfaceID = mDNSInterface_LocalOnly; // make the calls LogOperation("%3d: DNSServiceEnumerateDomains(%X=%s)", request->sd, flags, (flags & kDNSServiceFlagsBrowseDomains ) ? "kDNSServiceFlagsBrowseDomains" : (flags & kDNSServiceFlagsRegistrationDomains) ? "kDNSServiceFlagsRegistrationDomains" : "<>"); err = mDNS_GetDomains(&mDNSStorage, &request->u.enumeration.q_all, t_all, NULL, InterfaceID, enum_result_callback, request); if (!err) { err = mDNS_GetDomains(&mDNSStorage, &request->u.enumeration.q_default, t_default, NULL, InterfaceID, enum_result_callback, request); if (err) mDNS_StopGetDomains(&mDNSStorage, &request->u.enumeration.q_all); else request->terminate = enum_termination_callback; } return(err); } // *************************************************************************** #if COMPILER_LIKES_PRAGMA_MARK #pragma mark - #pragma mark - DNSServiceReconfirmRecord & Misc #endif mDNSlocal mStatus handle_reconfirm_request(request_state *request) { mStatus status = mStatus_BadParamErr; AuthRecord *rr = read_rr_from_ipc_msg(request, 0, 0); if (rr) { status = mDNS_ReconfirmByValue(&mDNSStorage, &rr->resrec); LogOperation( (status == mStatus_NoError) ? "%3d: DNSServiceReconfirmRecord(%s) interface %d initiated" : "%3d: DNSServiceReconfirmRecord(%s) interface %d failed: %d", request->sd, RRDisplayString(&mDNSStorage, &rr->resrec), mDNSPlatformInterfaceIndexfromInterfaceID(&mDNSStorage, rr->resrec.InterfaceID, mDNSfalse), status); freeL("AuthRecord/handle_reconfirm_request", rr); } return(status); } mDNSlocal mStatus handle_setdomain_request(request_state *request) { char domainstr[MAX_ESCAPED_DOMAIN_NAME]; domainname domain; DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend); (void)flags; // Unused if (get_string(&request->msgptr, request->msgend, domainstr, MAX_ESCAPED_DOMAIN_NAME) < 0 || !MakeDomainNameFromDNSNameString(&domain, domainstr)) { LogMsg("%3d: DNSServiceSetDefaultDomainForUser(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } LogOperation("%3d: DNSServiceSetDefaultDomainForUser(%##s)", request->sd, domain.c); return(mStatus_NoError); } typedef packedstruct { mStatus err; mDNSu32 len; mDNSu32 vers; } DaemonVersionReply; mDNSlocal void handle_getproperty_request(request_state *request) { const mStatus BadParamErr = dnssd_htonl((mDNSu32)mStatus_BadParamErr); char prop[256]; if (get_string(&request->msgptr, request->msgend, prop, sizeof(prop)) >= 0) { LogOperation("%3d: DNSServiceGetProperty(%s)", request->sd, prop); if (!strcmp(prop, kDNSServiceProperty_DaemonVersion)) { DaemonVersionReply x = { 0, dnssd_htonl(4), dnssd_htonl(_DNS_SD_H) }; send_all(request->sd, (const char *)&x, sizeof(x)); return; } } // If we didn't recogize the requested property name, return BadParamErr send_all(request->sd, (const char *)&BadParamErr, sizeof(BadParamErr)); } // *************************************************************************** #if COMPILER_LIKES_PRAGMA_MARK #pragma mark - #pragma mark - DNSServiceNATPortMappingCreate #endif #define DNSServiceProtocol(X) ((X) == NATOp_AddrRequest ? 0 : (X) == NATOp_MapUDP ? kDNSServiceProtocol_UDP : kDNSServiceProtocol_TCP) mDNSlocal void port_mapping_termination_callback(request_state *request) { LogOperation("%3d: DNSServiceNATPortMappingCreate(%X, %u, %u, %d) STOP", request->sd, DNSServiceProtocol(request->u.pm.NATinfo.Protocol), mDNSVal16(request->u.pm.NATinfo.IntPort), mDNSVal16(request->u.pm.ReqExt), request->u.pm.NATinfo.NATLease); mDNS_StopNATOperation(&mDNSStorage, &request->u.pm.NATinfo); } // Called via function pointer when we get a NAT-PMP address request or port mapping response mDNSlocal void port_mapping_create_request_callback(mDNS *m, NATTraversalInfo *n) { request_state *request = (request_state *)n->clientContext; reply_state *rep; int replyLen; char *data; if (!request) { LogMsg("port_mapping_create_request_callback called with unknown request_state object"); return; } // calculate reply data length replyLen = sizeof(DNSServiceFlags); replyLen += 3 * sizeof(mDNSu32); // if index + addr + ttl replyLen += sizeof(DNSServiceErrorType); replyLen += 2 * sizeof(mDNSu16); // Internal Port + External Port replyLen += sizeof(mDNSu8); // protocol rep = create_reply(port_mapping_reply_op, replyLen, request); rep->rhdr->flags = dnssd_htonl(0); rep->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(m, n->InterfaceID, mDNSfalse)); rep->rhdr->error = dnssd_htonl(n->Result); data = (char *)&rep->rhdr[1]; *data++ = request->u.pm.NATinfo.ExternalAddress.b[0]; *data++ = request->u.pm.NATinfo.ExternalAddress.b[1]; *data++ = request->u.pm.NATinfo.ExternalAddress.b[2]; *data++ = request->u.pm.NATinfo.ExternalAddress.b[3]; *data++ = DNSServiceProtocol(request->u.pm.NATinfo.Protocol); *data++ = request->u.pm.NATinfo.IntPort.b[0]; *data++ = request->u.pm.NATinfo.IntPort.b[1]; *data++ = request->u.pm.NATinfo.ExternalPort.b[0]; *data++ = request->u.pm.NATinfo.ExternalPort.b[1]; put_uint32(request->u.pm.NATinfo.Lifetime, &data); LogOperation("%3d: DNSServiceNATPortMappingCreate(%X, %u, %u, %d) RESULT %.4a:%u TTL %u", request->sd, DNSServiceProtocol(request->u.pm.NATinfo.Protocol), mDNSVal16(request->u.pm.NATinfo.IntPort), mDNSVal16(request->u.pm.ReqExt), request->u.pm.NATinfo.NATLease, &request->u.pm.NATinfo.ExternalAddress, mDNSVal16(request->u.pm.NATinfo.ExternalPort), request->u.pm.NATinfo.Lifetime); append_reply(request, rep); } mDNSlocal mStatus handle_port_mapping_request(request_state *request) { mDNSu32 ttl = 0; mStatus err = mStatus_NoError; DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend); mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend); mDNSInterfaceID InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex); mDNSu8 protocol = (mDNSu8)get_uint32(&request->msgptr, request->msgend); (void)flags; // Unused if (interfaceIndex && !InterfaceID) return(mStatus_BadParamErr); if (request->msgptr + 8 > request->msgend) request->msgptr = NULL; else { request->u.pm.NATinfo.IntPort.b[0] = *request->msgptr++; request->u.pm.NATinfo.IntPort.b[1] = *request->msgptr++; request->u.pm.ReqExt.b[0] = *request->msgptr++; request->u.pm.ReqExt.b[1] = *request->msgptr++; ttl = get_uint32(&request->msgptr, request->msgend); } if (!request->msgptr) { LogMsg("%3d: DNSServiceNATPortMappingCreate(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } if (protocol == 0) // If protocol == 0 (i.e. just request public address) then IntPort, ExtPort, ttl must be zero too { if (!mDNSIPPortIsZero(request->u.pm.NATinfo.IntPort) || !mDNSIPPortIsZero(request->u.pm.ReqExt) || ttl) return(mStatus_BadParamErr); } else { if (mDNSIPPortIsZero(request->u.pm.NATinfo.IntPort)) return(mStatus_BadParamErr); if (!(protocol & (kDNSServiceProtocol_UDP | kDNSServiceProtocol_TCP))) return(mStatus_BadParamErr); } request->u.pm.NATinfo.Protocol = !protocol ? NATOp_AddrRequest : (protocol == kDNSServiceProtocol_UDP) ? NATOp_MapUDP : NATOp_MapTCP; // u.pm.NATinfo.IntPort = already set above request->u.pm.NATinfo.RequestedPort = request->u.pm.ReqExt; request->u.pm.NATinfo.NATLease = ttl; request->u.pm.NATinfo.clientCallback = port_mapping_create_request_callback; request->u.pm.NATinfo.clientContext = request; LogOperation("%3d: DNSServiceNATPortMappingCreate(%X, %u, %u, %d) START", request->sd, protocol, mDNSVal16(request->u.pm.NATinfo.IntPort), mDNSVal16(request->u.pm.ReqExt), request->u.pm.NATinfo.NATLease); err = mDNS_StartNATOperation(&mDNSStorage, &request->u.pm.NATinfo); if (err) LogMsg("ERROR: mDNS_StartNATOperation: %d", (int)err); else request->terminate = port_mapping_termination_callback; return(err); } // *************************************************************************** #if COMPILER_LIKES_PRAGMA_MARK #pragma mark - #pragma mark - DNSServiceGetAddrInfo #endif mDNSlocal void addrinfo_termination_callback(request_state *request) { LogOperation("%3d: DNSServiceGetAddrInfo(%##s) STOP", request->sd, request->u.addrinfo.q4.qname.c); if (request->u.addrinfo.q4.QuestionContext) { mDNS_StopQuery(&mDNSStorage, &request->u.addrinfo.q4); request->u.addrinfo.q4.QuestionContext = mDNSNULL; } if (request->u.addrinfo.q4.qnameOrig) { freeL("QueryTermination", request->u.addrinfo.q4.qnameOrig); request->u.addrinfo.q4.qnameOrig = mDNSNULL; } if (request->u.addrinfo.q42) { if (request->u.addrinfo.q42->QuestionContext) { LogInfo("addrinfo_termination_callback: Stopping q42 %##s", request->u.addrinfo.q42->qname.c); mDNS_StopQuery(&mDNSStorage, request->u.addrinfo.q42); } if (request->u.addrinfo.q42->qnameOrig) { LogInfo("addrinfo_termination_callback: freeing q42 qnameOrig %##s", request->u.addrinfo.q42->qnameOrig->c); freeL("QueryTermination q42", request->u.addrinfo.q42->qnameOrig); request->u.addrinfo.q42->qnameOrig = mDNSNULL; } freeL("addrinfo Q42", request->u.addrinfo.q42); request->u.addrinfo.q42 = mDNSNULL; } if (request->u.addrinfo.q6.QuestionContext) { mDNS_StopQuery(&mDNSStorage, &request->u.addrinfo.q6); request->u.addrinfo.q6.QuestionContext = mDNSNULL; } if (request->u.addrinfo.q6.qnameOrig) { freeL("QueryTermination", request->u.addrinfo.q6.qnameOrig); request->u.addrinfo.q6.qnameOrig = mDNSNULL; } if (request->u.addrinfo.q62) { if (request->u.addrinfo.q62->QuestionContext) { LogInfo("addrinfo_termination_callback: Stopping q62 %##s", request->u.addrinfo.q62->qname.c); mDNS_StopQuery(&mDNSStorage, request->u.addrinfo.q62); } if (request->u.addrinfo.q62->qnameOrig) { LogInfo("addrinfo_termination_callback: freeing q62 qnameOrig %##s", request->u.addrinfo.q62->qnameOrig->c); freeL("QueryTermination q62", request->u.addrinfo.q62->qnameOrig); request->u.addrinfo.q62->qnameOrig = mDNSNULL; } freeL("addrinfo Q62", request->u.addrinfo.q62); request->u.addrinfo.q62 = mDNSNULL; } } mDNSlocal mStatus handle_addrinfo_request(request_state *request) { char hostname[256]; domainname d; mStatus err = 0; DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend); mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend); mDNSPlatformMemZero(&request->u.addrinfo, sizeof(request->u.addrinfo)); request->u.addrinfo.interface_id = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex); request->u.addrinfo.flags = flags; request->u.addrinfo.protocol = get_uint32(&request->msgptr, request->msgend); if (interfaceIndex && !request->u.addrinfo.interface_id) return(mStatus_BadParamErr); if (request->u.addrinfo.protocol > (kDNSServiceProtocol_IPv4|kDNSServiceProtocol_IPv6)) return(mStatus_BadParamErr); if (get_string(&request->msgptr, request->msgend, hostname, 256) < 0) return(mStatus_BadParamErr); if (!request->msgptr) { LogMsg("%3d: DNSServiceGetAddrInfo(unreadable parameters)", request->sd); return(mStatus_BadParamErr); } if (!MakeDomainNameFromDNSNameString(&d, hostname)) { LogMsg("ERROR: handle_addrinfo_request: bad hostname: %s", hostname); return(mStatus_BadParamErr); } #if 0 if (!AuthorizedDomain(request, &d, AutoBrowseDomains)) return (mStatus_NoError); #endif if (!request->u.addrinfo.protocol) { flags |= kDNSServiceFlagsSuppressUnusable; request->u.addrinfo.protocol = (kDNSServiceProtocol_IPv4 | kDNSServiceProtocol_IPv6); } request->u.addrinfo.q4.InterfaceID = request->u.addrinfo.q6.InterfaceID = request->u.addrinfo.interface_id; request->u.addrinfo.q4.Target = request->u.addrinfo.q6.Target = zeroAddr; request->u.addrinfo.q4.qname = request->u.addrinfo.q6.qname = d; request->u.addrinfo.q4.qclass = request->u.addrinfo.q6.qclass = kDNSServiceClass_IN; request->u.addrinfo.q4.LongLived = request->u.addrinfo.q6.LongLived = (flags & kDNSServiceFlagsLongLivedQuery ) != 0; request->u.addrinfo.q4.ExpectUnique = request->u.addrinfo.q6.ExpectUnique = mDNSfalse; request->u.addrinfo.q4.ForceMCast = request->u.addrinfo.q6.ForceMCast = (flags & kDNSServiceFlagsForceMulticast ) != 0; request->u.addrinfo.q4.ReturnIntermed = request->u.addrinfo.q6.ReturnIntermed = (flags & kDNSServiceFlagsReturnIntermediates) != 0; request->u.addrinfo.q4.SuppressUnusable = request->u.addrinfo.q6.SuppressUnusable = (flags & kDNSServiceFlagsSuppressUnusable ) != 0; request->u.addrinfo.q4.TimeoutQuestion = request->u.addrinfo.q6.TimeoutQuestion = (flags & kDNSServiceFlagsTimeout ) != 0; request->u.addrinfo.q4.WakeOnResolve = request->u.addrinfo.q6.WakeOnResolve = 0; request->u.addrinfo.q4.qnameOrig = request->u.addrinfo.q6.qnameOrig = mDNSNULL; if (request->u.addrinfo.protocol & kDNSServiceProtocol_IPv4) { request->u.addrinfo.q4.qtype = kDNSServiceType_A; request->u.addrinfo.q4.SearchListIndex = 0; // We append search domains only for queries that are a single label. If overriden using // command line argument "AlwaysAppendSearchDomains", then we do it for any query which // is not fully qualified. if (hostname[strlen(hostname) - 1] != '.' && (AlwaysAppendSearchDomains || CountLabels(&d) == 1)) { request->u.addrinfo.q4.AppendSearchDomains = 1; request->u.addrinfo.q4.AppendLocalSearchDomains = 1; } else { request->u.addrinfo.q4.AppendSearchDomains = 0; request->u.addrinfo.q4.AppendLocalSearchDomains = 0; } request->u.addrinfo.q4.RetryWithSearchDomains = (ApplySearchDomainsFirst(&request->u.addrinfo.q4) ? 1 : 0); request->u.addrinfo.q4.QuestionCallback = queryrecord_result_callback; request->u.addrinfo.q4.QuestionContext = request; err = mDNS_StartQuery(&mDNSStorage, &request->u.addrinfo.q4); if (err != mStatus_NoError) { LogMsg("ERROR: mDNS_StartQuery: %d", (int)err); request->u.addrinfo.q4.QuestionContext = mDNSNULL; } #if APPLE_OSX_mDNSResponder err = SendAdditionalQuery(&request->u.addrinfo.q4, request, err); #endif // APPLE_OSX_mDNSResponder } if (!err && (request->u.addrinfo.protocol & kDNSServiceProtocol_IPv6)) { request->u.addrinfo.q6.qtype = kDNSServiceType_AAAA; request->u.addrinfo.q6.SearchListIndex = 0; if (hostname[strlen(hostname) - 1] != '.' && (AlwaysAppendSearchDomains || CountLabels(&d) == 1)) { request->u.addrinfo.q6.AppendSearchDomains = 1; request->u.addrinfo.q6.AppendLocalSearchDomains = 1; } else { request->u.addrinfo.q6.AppendSearchDomains = 0; request->u.addrinfo.q6.AppendLocalSearchDomains = 0; } request->u.addrinfo.q6.RetryWithSearchDomains = (ApplySearchDomainsFirst(&request->u.addrinfo.q6) ? 1 : 0); request->u.addrinfo.q6.QuestionCallback = queryrecord_result_callback; request->u.addrinfo.q6.QuestionContext = request; err = mDNS_StartQuery(&mDNSStorage, &request->u.addrinfo.q6); if (err != mStatus_NoError) { LogMsg("ERROR: mDNS_StartQuery: %d", (int)err); request->u.addrinfo.q6.QuestionContext = mDNSNULL; if (request->u.addrinfo.protocol & kDNSServiceProtocol_IPv4) { // If we started a query for IPv4, we need to cancel it mDNS_StopQuery(&mDNSStorage, &request->u.addrinfo.q4); request->u.addrinfo.q4.QuestionContext = mDNSNULL; } } #if APPLE_OSX_mDNSResponder err = SendAdditionalQuery(&request->u.addrinfo.q6, request, err); #endif // APPLE_OSX_mDNSResponder } LogOperation("%3d: DNSServiceGetAddrInfo(%X, %d, %d, %##s) START", request->sd, flags, interfaceIndex, request->u.addrinfo.protocol, d.c); if (!err) request->terminate = addrinfo_termination_callback; return(err); } // *************************************************************************** #if COMPILER_LIKES_PRAGMA_MARK #pragma mark - #pragma mark - Main Request Handler etc. #endif mDNSlocal request_state *NewRequest(void) { request_state **p = &all_requests; while (*p) p=&(*p)->next; *p = mallocL("request_state", sizeof(request_state)); if (!*p) FatalError("ERROR: malloc"); mDNSPlatformMemZero(*p, sizeof(request_state)); return(*p); } // read_msg may be called any time when the transfer state (req->ts) is t_morecoming. // if there is no data on the socket, the socket will be closed and t_terminated will be returned mDNSlocal void read_msg(request_state *req) { if (req->ts == t_terminated || req->ts == t_error) { LogMsg("%3d: ERROR: read_msg called with transfer state terminated or error", req->sd); req->ts = t_error; return; } if (req->ts == t_complete) // this must be death or something is wrong { char buf[4]; // dummy for death notification int nread = udsSupportReadFD(req->sd, buf, 4, 0, req->platform_data); if (!nread) { req->ts = t_terminated; return; } if (nread < 0) goto rerror; LogMsg("%3d: ERROR: read data from a completed request", req->sd); req->ts = t_error; return; } if (req->ts != t_morecoming) { LogMsg("%3d: ERROR: read_msg called with invalid transfer state (%d)", req->sd, req->ts); req->ts = t_error; return; } if (req->hdr_bytes < sizeof(ipc_msg_hdr)) { mDNSu32 nleft = sizeof(ipc_msg_hdr) - req->hdr_bytes; int nread = udsSupportReadFD(req->sd, (char *)&req->hdr + req->hdr_bytes, nleft, 0, req->platform_data); if (nread == 0) { req->ts = t_terminated; return; } if (nread < 0) goto rerror; req->hdr_bytes += nread; if (req->hdr_bytes > sizeof(ipc_msg_hdr)) { LogMsg("%3d: ERROR: read_msg - read too many header bytes", req->sd); req->ts = t_error; return; } // only read data if header is complete if (req->hdr_bytes == sizeof(ipc_msg_hdr)) { ConvertHeaderBytes(&req->hdr); if (req->hdr.version != VERSION) { LogMsg("%3d: ERROR: client version 0x%08X daemon version 0x%08X", req->sd, req->hdr.version, VERSION); req->ts = t_error; return; } // Largest conceivable single request is a DNSServiceRegisterRecord() or DNSServiceAddRecord() // with 64kB of rdata. Adding 1009 byte for a maximal domain name, plus a safety margin // for other overhead, this means any message above 70kB is definitely bogus. if (req->hdr.datalen > 70000) { LogMsg("%3d: ERROR: read_msg: hdr.datalen %u (0x%X) > 70000", req->sd, req->hdr.datalen, req->hdr.datalen); req->ts = t_error; return; } req->msgbuf = mallocL("request_state msgbuf", req->hdr.datalen + MSG_PAD_BYTES); if (!req->msgbuf) { my_perror("ERROR: malloc"); req->ts = t_error; return; } req->msgptr = req->msgbuf; req->msgend = req->msgbuf + req->hdr.datalen; mDNSPlatformMemZero(req->msgbuf, req->hdr.datalen + MSG_PAD_BYTES); } } // If our header is complete, but we're still needing more body data, then try to read it now // Note: For cancel_request req->hdr.datalen == 0, but there's no error return socket for cancel_request // Any time we need to get the error return socket we know we'll have at least one data byte // (even if only the one-byte empty C string placeholder for the old ctrl_path parameter) if (req->hdr_bytes == sizeof(ipc_msg_hdr) && req->data_bytes < req->hdr.datalen) { mDNSu32 nleft = req->hdr.datalen - req->data_bytes; int nread; #if !defined(_WIN32) struct iovec vec = { req->msgbuf + req->data_bytes, nleft }; // Tell recvmsg where we want the bytes put struct msghdr msg; struct cmsghdr *cmsg; char cbuf[CMSG_SPACE(sizeof(dnssd_sock_t))]; msg.msg_name = 0; msg.msg_namelen = 0; msg.msg_iov = &vec; msg.msg_iovlen = 1; msg.msg_control = cbuf; msg.msg_controllen = sizeof(cbuf); msg.msg_flags = 0; nread = recvmsg(req->sd, &msg, 0); #else nread = udsSupportReadFD(req->sd, (char *)req->msgbuf + req->data_bytes, nleft, 0, req->platform_data); #endif if (nread == 0) { req->ts = t_terminated; return; } if (nread < 0) goto rerror; req->data_bytes += nread; if (req->data_bytes > req->hdr.datalen) { LogMsg("%3d: ERROR: read_msg - read too many data bytes", req->sd); req->ts = t_error; return; } #if !defined(_WIN32) cmsg = CMSG_FIRSTHDR(&msg); #if DEBUG_64BIT_SCM_RIGHTS LogMsg("%3d: Expecting %d %d %d %d", req->sd, sizeof(cbuf), sizeof(cbuf), SOL_SOCKET, SCM_RIGHTS); LogMsg("%3d: Got %d %d %d %d", req->sd, msg.msg_controllen, cmsg->cmsg_len, cmsg->cmsg_level, cmsg->cmsg_type); #endif // DEBUG_64BIT_SCM_RIGHTS if (msg.msg_controllen == sizeof(cbuf) && cmsg->cmsg_len == CMSG_LEN(sizeof(dnssd_sock_t)) && cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) { #if APPLE_OSX_mDNSResponder // Strictly speaking BPF_fd belongs solely in the platform support layer, but because // of privilege separation on Mac OS X we need to get BPF_fd from mDNSResponderHelper, // and it's convenient to repurpose the existing fd-passing code here for that task if (req->hdr.op == send_bpf) { dnssd_sock_t x = *(dnssd_sock_t *)CMSG_DATA(cmsg); LogOperation("%3d: Got BPF %d", req->sd, x); mDNSPlatformReceiveBPF_fd(&mDNSStorage, x); } else #endif // APPLE_OSX_mDNSResponder req->errsd = *(dnssd_sock_t *)CMSG_DATA(cmsg); #if DEBUG_64BIT_SCM_RIGHTS LogMsg("%3d: read req->errsd %d", req->sd, req->errsd); #endif // DEBUG_64BIT_SCM_RIGHTS if (req->data_bytes < req->hdr.datalen) { LogMsg("%3d: Client sent error socket %d via SCM_RIGHTS with req->data_bytes %d < req->hdr.datalen %d", req->sd, req->errsd, req->data_bytes, req->hdr.datalen); req->ts = t_error; return; } } #endif } // If our header and data are both complete, see if we need to make our separate error return socket if (req->hdr_bytes == sizeof(ipc_msg_hdr) && req->data_bytes == req->hdr.datalen) { if (req->terminate && req->hdr.op != cancel_request) { dnssd_sockaddr_t cliaddr; #if defined(USE_TCP_LOOPBACK) mDNSOpaque16 port; u_long opt = 1; port.b[0] = req->msgptr[0]; port.b[1] = req->msgptr[1]; req->msgptr += 2; cliaddr.sin_family = AF_INET; cliaddr.sin_port = port.NotAnInteger; cliaddr.sin_addr.s_addr = inet_addr(MDNS_TCP_SERVERADDR); #else char ctrl_path[MAX_CTLPATH]; get_string(&req->msgptr, req->msgend, ctrl_path, MAX_CTLPATH); // path is first element in message buffer mDNSPlatformMemZero(&cliaddr, sizeof(cliaddr)); cliaddr.sun_family = AF_LOCAL; mDNSPlatformStrCopy(cliaddr.sun_path, ctrl_path); // If the error return path UDS name is empty string, that tells us // that this is a new version of the library that's going to pass us // the error return path socket via sendmsg/recvmsg if (ctrl_path[0] == 0) { if (req->errsd == req->sd) { LogMsg("%3d: read_msg: ERROR failed to get errsd via SCM_RIGHTS", req->sd); req->ts = t_error; return; } goto got_errfd; } #endif req->errsd = socket(AF_DNSSD, SOCK_STREAM, 0); if (!dnssd_SocketValid(req->errsd)) { my_perror("ERROR: socket"); req->ts = t_error; return; } if (connect(req->errsd, (struct sockaddr *)&cliaddr, sizeof(cliaddr)) < 0) { #if !defined(USE_TCP_LOOPBACK) struct stat sb; LogMsg("%3d: read_msg: Couldn't connect to error return path socket “%s” errno %d (%s)", req->sd, cliaddr.sun_path, dnssd_errno, dnssd_strerror(dnssd_errno)); if (stat(cliaddr.sun_path, &sb) < 0) LogMsg("%3d: read_msg: stat failed “%s” errno %d (%s)", req->sd, cliaddr.sun_path, dnssd_errno, dnssd_strerror(dnssd_errno)); else LogMsg("%3d: read_msg: file “%s” mode %o (octal) uid %d gid %d", req->sd, cliaddr.sun_path, sb.st_mode, sb.st_uid, sb.st_gid); #endif req->ts = t_error; return; } #if !defined(USE_TCP_LOOPBACK) got_errfd: #endif LogOperation("%3d: Error socket %d created %08X %08X", req->sd, req->errsd, req->hdr.client_context.u32[1], req->hdr.client_context.u32[0]); #if defined(_WIN32) if (ioctlsocket(req->errsd, FIONBIO, &opt) != 0) #else if (fcntl(req->errsd, F_SETFL, fcntl(req->errsd, F_GETFL, 0) | O_NONBLOCK) != 0) #endif { LogMsg("%3d: ERROR: could not set control socket to non-blocking mode errno %d (%s)", req->sd, dnssd_errno, dnssd_strerror(dnssd_errno)); req->ts = t_error; return; } } req->ts = t_complete; } return; rerror: if (dnssd_errno == dnssd_EWOULDBLOCK || dnssd_errno == dnssd_EINTR) return; LogMsg("%3d: ERROR: read_msg errno %d (%s)", req->sd, dnssd_errno, dnssd_strerror(dnssd_errno)); req->ts = t_error; } #define RecordOrientedOp(X) \ ((X) == reg_record_request || (X) == add_record_request || (X) == update_record_request || (X) == remove_record_request) // The lightweight operations are the ones that don't need a dedicated request_state structure allocated for them #define LightweightOp(X) (RecordOrientedOp(X) || (X) == cancel_request) mDNSlocal void request_callback(int fd, short filter, void *info) { mStatus err = 0; request_state *req = info; mDNSs32 min_size = sizeof(DNSServiceFlags); (void)fd; // Unused (void)filter; // Unused for (;;) { read_msg(req); if (req->ts == t_morecoming) return; if (req->ts == t_terminated || req->ts == t_error) { AbortUnlinkAndFree(req); return; } if (req->ts != t_complete) { LogMsg("req->ts %d != t_complete", req->ts); AbortUnlinkAndFree(req); return; } if (req->hdr.version != VERSION) { LogMsg("ERROR: client version %d incompatible with daemon version %d", req->hdr.version, VERSION); AbortUnlinkAndFree(req); return; } switch(req->hdr.op) // Interface + other data { case connection_request: min_size = 0; break; case reg_service_request: min_size += sizeof(mDNSu32) + 4 /* name, type, domain, host */ + 4 /* port, textlen */; break; case add_record_request: min_size += 4 /* type, rdlen */ + 4 /* ttl */; break; case update_record_request: min_size += 2 /* rdlen */ + 4 /* ttl */; break; case remove_record_request: break; case browse_request: min_size += sizeof(mDNSu32) + 2 /* type, domain */; break; case resolve_request: min_size += sizeof(mDNSu32) + 3 /* type, type, domain */; break; case query_request: min_size += sizeof(mDNSu32) + 1 /* name */ + 4 /* type, class*/; break; case enumeration_request: min_size += sizeof(mDNSu32); break; case reg_record_request: min_size += sizeof(mDNSu32) + 1 /* name */ + 6 /* type, class, rdlen */ + 4 /* ttl */; break; case reconfirm_record_request: min_size += sizeof(mDNSu32) + 1 /* name */ + 6 /* type, class, rdlen */; break; case setdomain_request: min_size += 1 /* domain */; break; case getproperty_request: min_size = 2; break; case port_mapping_request: min_size += sizeof(mDNSu32) + 4 /* udp/tcp */ + 4 /* int/ext port */ + 4 /* ttl */; break; case addrinfo_request: min_size += sizeof(mDNSu32) + 4 /* v4/v6 */ + 1 /* hostname */; break; case send_bpf: // Same as cancel_request below case cancel_request: min_size = 0; break; case sethost_request: min_size = sizeof(mDNSu32) + 1 /* hostname */; break; default: LogMsg("ERROR: validate_message - unsupported req type: %d", req->hdr.op); min_size = -1; break; } if ((mDNSs32)req->data_bytes < min_size) { LogMsg("Invalid message %d bytes; min for %d is %d", req->data_bytes, req->hdr.op, min_size); AbortUnlinkAndFree(req); return; } if (LightweightOp(req->hdr.op) && !req->terminate) { LogMsg("Reg/Add/Update/Remove %d require existing connection", req->hdr.op); AbortUnlinkAndFree(req); return; } // check if client wants silent operation if (req->hdr.ipc_flags & IPC_FLAGS_NOREPLY) req->no_reply = 1; // If req->terminate is already set, this means this operation is sharing an existing connection if (req->terminate && !LightweightOp(req->hdr.op)) { request_state *newreq = NewRequest(); newreq->primary = req; newreq->sd = req->sd; newreq->errsd = req->errsd; newreq->uid = req->uid; newreq->hdr = req->hdr; newreq->msgbuf = req->msgbuf; newreq->msgptr = req->msgptr; newreq->msgend = req->msgend; req = newreq; } // If we're shutting down, don't allow new client requests // We do allow "cancel" and "getproperty" during shutdown if (mDNSStorage.ShutdownTime && req->hdr.op != cancel_request && req->hdr.op != getproperty_request) { err = mStatus_ServiceNotRunning; } else switch(req->hdr.op) { // These are all operations that have their own first-class request_state object case connection_request: LogOperation("%3d: DNSServiceCreateConnection START", req->sd); req->terminate = connection_termination; break; case resolve_request: err = handle_resolve_request (req); break; case query_request: err = handle_queryrecord_request (req); break; case browse_request: err = handle_browse_request (req); break; case reg_service_request: err = handle_regservice_request (req); break; case enumeration_request: err = handle_enum_request (req); break; case reconfirm_record_request: err = handle_reconfirm_request (req); break; case setdomain_request: err = handle_setdomain_request (req); break; case getproperty_request: handle_getproperty_request (req); break; case port_mapping_request: err = handle_port_mapping_request(req); break; case addrinfo_request: err = handle_addrinfo_request (req); break; case send_bpf: /* Do nothing for send_bpf */ break; // These are all operations that work with an existing request_state object case reg_record_request: err = handle_regrecord_request (req); break; case add_record_request: err = handle_add_request (req); break; case update_record_request: err = handle_update_request (req); break; case remove_record_request: err = handle_removerecord_request(req); break; case cancel_request: handle_cancel_request (req); break; case sethost_request: err = handle_sethost_request (req); break; default: LogMsg("%3d: ERROR: Unsupported UDS req: %d", req->sd, req->hdr.op); } // req->msgbuf may be NULL, e.g. for connection_request or remove_record_request if (req->msgbuf) freeL("request_state msgbuf", req->msgbuf); // There's no return data for a cancel request (DNSServiceRefDeallocate returns no result) // For a DNSServiceGetProperty call, the handler already generated the response, so no need to do it again here if (req->hdr.op != cancel_request && req->hdr.op != getproperty_request && req->hdr.op != send_bpf) { const mStatus err_netorder = dnssd_htonl(err); send_all(req->errsd, (const char *)&err_netorder, sizeof(err_netorder)); if (req->errsd != req->sd) { LogOperation("%3d: Error socket %d closed %08X %08X (%d)", req->sd, req->errsd, req->hdr.client_context.u32[1], req->hdr.client_context.u32[0], err); dnssd_close(req->errsd); req->errsd = req->sd; // Also need to reset the parent's errsd, if this is a subordinate operation if (req->primary) req->primary->errsd = req->primary->sd; } } // Reset ready to accept the next req on this pipe if (req->primary) req = req->primary; req->ts = t_morecoming; req->hdr_bytes = 0; req->data_bytes = 0; req->msgbuf = mDNSNULL; req->msgptr = mDNSNULL; req->msgend = 0; } } mDNSlocal void connect_callback(int fd, short filter, void *info) { dnssd_sockaddr_t cliaddr; dnssd_socklen_t len = (dnssd_socklen_t) sizeof(cliaddr); dnssd_sock_t sd = accept(fd, (struct sockaddr*) &cliaddr, &len); #if defined(SO_NOSIGPIPE) || defined(_WIN32) unsigned long optval = 1; #endif (void)filter; // Unused (void)info; // Unused if (!dnssd_SocketValid(sd)) { if (dnssd_errno != dnssd_EWOULDBLOCK) my_perror("ERROR: accept"); return; } #ifdef SO_NOSIGPIPE // Some environments (e.g. OS X) support turning off SIGPIPE for a socket if (setsockopt(sd, SOL_SOCKET, SO_NOSIGPIPE, &optval, sizeof(optval)) < 0) LogMsg("%3d: WARNING: setsockopt - SO_NOSIGPIPE %d (%s)", sd, dnssd_errno, dnssd_strerror(dnssd_errno)); #endif #if defined(_WIN32) if (ioctlsocket(sd, FIONBIO, &optval) != 0) #else if (fcntl(sd, F_SETFL, fcntl(sd, F_GETFL, 0) | O_NONBLOCK) != 0) #endif { my_perror("ERROR: fcntl(sd, F_SETFL, O_NONBLOCK) - aborting client"); dnssd_close(sd); return; } else { request_state *request = NewRequest(); request->ts = t_morecoming; request->sd = sd; request->errsd = sd; #if APPLE_OSX_mDNSResponder struct xucred x; socklen_t xucredlen = sizeof(x); if (getsockopt(sd, 0, LOCAL_PEERCRED, &x, &xucredlen) >= 0 && x.cr_version == XUCRED_VERSION) request->uid = x.cr_uid; else my_perror("ERROR: getsockopt, LOCAL_PEERCRED"); debugf("LOCAL_PEERCRED %d %u %u %d", xucredlen, x.cr_version, x.cr_uid, x.cr_ngroups); #endif // APPLE_OSX_mDNSResponder LogOperation("%3d: Adding FD for uid %u", request->sd, request->uid); udsSupportAddFDToEventLoop(sd, request_callback, request, &request->platform_data); } } mDNSlocal mDNSBool uds_socket_setup(dnssd_sock_t skt) { #if defined(SO_NP_EXTENSIONS) struct so_np_extensions sonpx; socklen_t optlen = sizeof(struct so_np_extensions); sonpx.npx_flags = SONPX_SETOPTSHUT; sonpx.npx_mask = SONPX_SETOPTSHUT; if (setsockopt(skt, SOL_SOCKET, SO_NP_EXTENSIONS, &sonpx, optlen) < 0) my_perror("WARNING: could not set sockopt - SO_NP_EXTENSIONS"); #endif #if defined(_WIN32) // SEH: do we even need to do this on windows? // This socket will be given to WSAEventSelect which will automatically set it to non-blocking u_long opt = 1; if (ioctlsocket(skt, FIONBIO, &opt) != 0) #else if (fcntl(skt, F_SETFL, fcntl(skt, F_GETFL, 0) | O_NONBLOCK) != 0) #endif { my_perror("ERROR: could not set listen socket to non-blocking mode"); return mDNSfalse; } if (listen(skt, LISTENQ) != 0) { my_perror("ERROR: could not listen on listen socket"); return mDNSfalse; } if (mStatus_NoError != udsSupportAddFDToEventLoop(skt, connect_callback, (void *) NULL, (void **) NULL)) { my_perror("ERROR: could not add listen socket to event loop"); return mDNSfalse; } else LogOperation("%3d: Listening for incoming Unix Domain Socket client requests", skt); return mDNStrue; } mDNSexport int udsserver_init(dnssd_sock_t skts[], mDNSu32 count) { dnssd_sockaddr_t laddr; int ret; mDNSu32 i = 0; LogInfo("udsserver_init"); // If a particular platform wants to opt out of having a PID file, define PID_FILE to be "" if (PID_FILE[0]) { FILE *fp = fopen(PID_FILE, "w"); if (fp != NULL) { fprintf(fp, "%d\n", getpid()); fclose(fp); } } if (skts) { for (i = 0; i < count; i++) if (dnssd_SocketValid(skts[i]) && !uds_socket_setup(skts[i])) goto error; } else { listenfd = socket(AF_DNSSD, SOCK_STREAM, 0); if (!dnssd_SocketValid(listenfd)) { my_perror("ERROR: socket(AF_DNSSD, SOCK_STREAM, 0); failed"); goto error; } mDNSPlatformMemZero(&laddr, sizeof(laddr)); #if defined(USE_TCP_LOOPBACK) { laddr.sin_family = AF_INET; laddr.sin_port = htons(MDNS_TCP_SERVERPORT); laddr.sin_addr.s_addr = inet_addr(MDNS_TCP_SERVERADDR); ret = bind(listenfd, (struct sockaddr *) &laddr, sizeof(laddr)); if (ret < 0) { my_perror("ERROR: bind(listenfd, (struct sockaddr *) &laddr, sizeof(laddr)); failed"); goto error; } } #else { mode_t mask = umask(0); unlink(MDNS_UDS_SERVERPATH); // OK if this fails laddr.sun_family = AF_LOCAL; #ifndef NOT_HAVE_SA_LEN // According to Stevens (section 3.2), there is no portable way to // determine whether sa_len is defined on a particular platform. laddr.sun_len = sizeof(struct sockaddr_un); #endif if (strlen(MDNS_UDS_SERVERPATH) >= sizeof(laddr.sun_path)) { LogMsg("ERROR: MDNS_UDS_SERVERPATH must be < %d characters", (int)sizeof(laddr.sun_path)); goto error; } mDNSPlatformStrCopy(laddr.sun_path, MDNS_UDS_SERVERPATH); ret = bind(listenfd, (struct sockaddr *) &laddr, sizeof(laddr)); umask(mask); if (ret < 0) { my_perror("ERROR: bind(listenfd, (struct sockaddr *) &laddr, sizeof(laddr)); failed"); goto error; } } #endif if (!uds_socket_setup(listenfd)) goto error; } #if !defined(PLATFORM_NO_RLIMIT) { // Set maximum number of open file descriptors #define MIN_OPENFILES 10240 struct rlimit maxfds, newfds; // Due to bugs in OS X (, , ) // you have to get and set rlimits once before getrlimit will return sensible values if (getrlimit(RLIMIT_NOFILE, &maxfds) < 0) { my_perror("ERROR: Unable to get file descriptor limit"); return 0; } if (setrlimit(RLIMIT_NOFILE, &maxfds) < 0) my_perror("ERROR: Unable to set maximum file descriptor limit"); if (getrlimit(RLIMIT_NOFILE, &maxfds) < 0) { my_perror("ERROR: Unable to get file descriptor limit"); return 0; } newfds.rlim_max = (maxfds.rlim_max > MIN_OPENFILES) ? maxfds.rlim_max : MIN_OPENFILES; newfds.rlim_cur = (maxfds.rlim_cur > MIN_OPENFILES) ? maxfds.rlim_cur : MIN_OPENFILES; if (newfds.rlim_max != maxfds.rlim_max || newfds.rlim_cur != maxfds.rlim_cur) if (setrlimit(RLIMIT_NOFILE, &newfds) < 0) my_perror("ERROR: Unable to set maximum file descriptor limit"); if (getrlimit(RLIMIT_NOFILE, &maxfds) < 0) { my_perror("ERROR: Unable to get file descriptor limit"); return 0; } debugf("maxfds.rlim_max %d", (long)maxfds.rlim_max); debugf("maxfds.rlim_cur %d", (long)maxfds.rlim_cur); } #endif // We start a "LocalOnly" query looking for Automatic Browse Domain records. // When Domain Enumeration in uDNS.c finds an "lb" record from the network, its "FoundDomain" routine // creates a "LocalOnly" record, which results in our AutomaticBrowseDomainChange callback being invoked mDNS_GetDomains(&mDNSStorage, &mDNSStorage.AutomaticBrowseDomainQ, mDNS_DomainTypeBrowseAutomatic, mDNSNULL, mDNSInterface_LocalOnly, AutomaticBrowseDomainChange, mDNSNULL); // Add "local" as recommended registration domain ("dns-sd -E"), recommended browsing domain ("dns-sd -F"), and automatic browsing domain RegisterLocalOnlyDomainEnumPTR(&mDNSStorage, &localdomain, mDNS_DomainTypeRegistration); RegisterLocalOnlyDomainEnumPTR(&mDNSStorage, &localdomain, mDNS_DomainTypeBrowse); AddAutoBrowseDomain(0, &localdomain); udsserver_handle_configchange(&mDNSStorage); return 0; error: my_perror("ERROR: udsserver_init"); return -1; } mDNSexport int udsserver_exit(void) { // Cancel all outstanding client requests while (all_requests) AbortUnlinkAndFree(all_requests); // Clean up any special mDNSInterface_LocalOnly records we created, both the entries for "local" we // created in udsserver_init, and others we created as a result of reading local configuration data while (LocalDomainEnumRecords) { ARListElem *rem = LocalDomainEnumRecords; LocalDomainEnumRecords = LocalDomainEnumRecords->next; mDNS_Deregister(&mDNSStorage, &rem->ar); } // If the launching environment created no listening socket, // that means we created it ourselves, so we should clean it up on exit if (dnssd_SocketValid(listenfd)) { dnssd_close(listenfd); #if !defined(USE_TCP_LOOPBACK) // Currently, we're unable to remove /var/run/mdnsd because we've changed to userid "nobody" // to give up unnecessary privilege, but we need to be root to remove this Unix Domain Socket. // It would be nice if we could find a solution to this problem if (unlink(MDNS_UDS_SERVERPATH)) debugf("Unable to remove %s", MDNS_UDS_SERVERPATH); #endif } if (PID_FILE[0]) unlink(PID_FILE); return 0; } mDNSlocal void LogClientInfo(mDNS *const m, const request_state *req) { char prefix[16]; if (req->primary) mDNS_snprintf(prefix, sizeof(prefix), " -> "); else mDNS_snprintf(prefix, sizeof(prefix), "%3d:", req->sd); usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000); if (!req->terminate) LogMsgNoIdent("%s No operation yet on this socket", prefix); else if (req->terminate == connection_termination) { int num_records = 0, num_ops = 0; const registered_record_entry *p; const request_state *r; for (p = req->u.reg_recs; p; p=p->next) num_records++; for (r = req->next; r; r=r->next) if (r->primary == req) num_ops++; LogMsgNoIdent("%s DNSServiceCreateConnection: %d registered record%s, %d kDNSServiceFlagsShareConnection operation%s", prefix, num_records, num_records != 1 ? "s" : "", num_ops, num_ops != 1 ? "s" : ""); for (p = req->u.reg_recs; p; p=p->next) LogMsgNoIdent(" -> DNSServiceRegisterRecord %3d %s", p->key, ARDisplayString(m, p->rr)); for (r = req->next; r; r=r->next) if (r->primary == req) LogClientInfo(m, r); } else if (req->terminate == regservice_termination_callback) { service_instance *ptr; for (ptr = req->u.servicereg.instances; ptr; ptr = ptr->next) LogMsgNoIdent("%s DNSServiceRegister %##s %u/%u", (ptr == req->u.servicereg.instances) ? prefix : " ", ptr->srs.RR_SRV.resrec.name->c, mDNSVal16(req->u.servicereg.port), SRS_PORT(&ptr->srs)); } else if (req->terminate == browse_termination_callback) { browser_t *blist; for (blist = req->u.browser.browsers; blist; blist = blist->next) LogMsgNoIdent("%s DNSServiceBrowse %##s", (blist == req->u.browser.browsers) ? prefix : " ", blist->q.qname.c); } else if (req->terminate == resolve_termination_callback) LogMsgNoIdent("%s DNSServiceResolve %##s", prefix, req->u.resolve.qsrv.qname.c); else if (req->terminate == queryrecord_termination_callback) LogMsgNoIdent("%s DNSServiceQueryRecord %##s (%s)", prefix, req->u.queryrecord.q.qname.c, DNSTypeName(req->u.queryrecord.q.qtype)); else if (req->terminate == enum_termination_callback) LogMsgNoIdent("%s DNSServiceEnumerateDomains %##s", prefix, req->u.enumeration.q_all.qname.c); else if (req->terminate == port_mapping_termination_callback) LogMsgNoIdent("%s DNSServiceNATPortMapping %.4a %s%s Int %d Req %d Ext %d Req TTL %d Granted TTL %d", prefix, &req->u.pm.NATinfo.ExternalAddress, req->u.pm.NATinfo.Protocol & NATOp_MapTCP ? "TCP" : " ", req->u.pm.NATinfo.Protocol & NATOp_MapUDP ? "UDP" : " ", mDNSVal16(req->u.pm.NATinfo.IntPort), mDNSVal16(req->u.pm.ReqExt), mDNSVal16(req->u.pm.NATinfo.ExternalPort), req->u.pm.NATinfo.NATLease, req->u.pm.NATinfo.Lifetime); else if (req->terminate == addrinfo_termination_callback) LogMsgNoIdent("%s DNSServiceGetAddrInfo %s%s %##s", prefix, req->u.addrinfo.protocol & kDNSServiceProtocol_IPv4 ? "v4" : " ", req->u.addrinfo.protocol & kDNSServiceProtocol_IPv6 ? "v6" : " ", req->u.addrinfo.q4.qname.c); else LogMsgNoIdent("%s Unrecognized operation %p", prefix, req->terminate); } mDNSlocal char *RecordTypeName(mDNSu8 rtype) { switch (rtype) { case kDNSRecordTypeUnregistered: return ("Unregistered "); case kDNSRecordTypeDeregistering: return ("Deregistering"); case kDNSRecordTypeUnique: return ("Unique "); case kDNSRecordTypeAdvisory: return ("Advisory "); case kDNSRecordTypeShared: return ("Shared "); case kDNSRecordTypeVerified: return ("Verified "); case kDNSRecordTypeKnownUnique: return ("KnownUnique "); default: return("Unknown"); } } mDNSlocal void LogEtcHosts(mDNS *const m) { mDNSBool showheader = mDNStrue; const AuthRecord *ar; mDNSu32 slot; AuthGroup *ag; int count = 0; int authslot = 0; mDNSBool truncated = 0; for (slot = 0; slot < AUTH_HASH_SLOTS; slot++) { if (m->rrauth.rrauth_hash[slot]) authslot++; for (ag = m->rrauth.rrauth_hash[slot]; ag; ag = ag->next) for (ar = ag->members; ar; ar = ar->next) { if (ar->RecordCallback != FreeEtcHosts) continue; if (showheader) { showheader = mDNSfalse; LogMsgNoIdent(" State Interface"); } // Print a maximum of 50 records if (count++ >= 50) { truncated = mDNStrue; continue; } if (ar->ARType == AuthRecordLocalOnly) { if (ar->resrec.InterfaceID == mDNSInterface_LocalOnly) LogMsgNoIdent(" %s LO %s", RecordTypeName(ar->resrec.RecordType), ARDisplayString(m, ar)); else { mDNSu32 scopeid = (mDNSu32)(uintptr_t)ar->resrec.InterfaceID; LogMsgNoIdent(" %s %u %s", RecordTypeName(ar->resrec.RecordType), scopeid, ARDisplayString(m, ar)); } } usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000); } } if (showheader) LogMsgNoIdent(""); else if (truncated) LogMsgNoIdent("", count, m->rrauth.rrauth_totalused, authslot); } mDNSlocal void LogLocalOnlyAuthRecords(mDNS *const m) { mDNSBool showheader = mDNStrue; const AuthRecord *ar; mDNSu32 slot; AuthGroup *ag; for (slot = 0; slot < AUTH_HASH_SLOTS; slot++) { for (ag = m->rrauth.rrauth_hash[slot]; ag; ag = ag->next) for (ar = ag->members; ar; ar = ar->next) { if (ar->RecordCallback == FreeEtcHosts) continue; if (showheader) { showheader = mDNSfalse; LogMsgNoIdent(" State Interface"); } // Print a maximum of 400 records if (ar->ARType == AuthRecordLocalOnly) LogMsgNoIdent(" %s LO %s", RecordTypeName(ar->resrec.RecordType), ARDisplayString(m, ar)); else if (ar->ARType == AuthRecordP2P) LogMsgNoIdent(" %s PP %s", RecordTypeName(ar->resrec.RecordType), ARDisplayString(m, ar)); usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000); } } if (showheader) LogMsgNoIdent(""); } mDNSlocal void LogAuthRecords(mDNS *const m, const mDNSs32 now, AuthRecord *ResourceRecords, int *proxy) { mDNSBool showheader = mDNStrue; const AuthRecord *ar; OwnerOptData owner = zeroOwner; for (ar = ResourceRecords; ar; ar=ar->next) { const char *const ifname = InterfaceNameForID(m, ar->resrec.InterfaceID); if ((ar->WakeUp.HMAC.l[0] != 0) == (proxy != mDNSNULL)) { if (showheader) { showheader = mDNSfalse; LogMsgNoIdent(" Int Next Expire State"); } if (proxy) (*proxy)++; if (!mDNSPlatformMemSame(&owner, &ar->WakeUp, sizeof(owner))) { owner = ar->WakeUp; if (owner.password.l[0]) LogMsgNoIdent("Proxying for H-MAC %.6a I-MAC %.6a Password %.6a seq %d", &owner.HMAC, &owner.IMAC, &owner.password, owner.seq); else if (!mDNSSameEthAddress(&owner.HMAC, &owner.IMAC)) LogMsgNoIdent("Proxying for H-MAC %.6a I-MAC %.6a seq %d", &owner.HMAC, &owner.IMAC, owner.seq); else LogMsgNoIdent("Proxying for %.6a seq %d", &owner.HMAC, owner.seq); } if (AuthRecord_uDNS(ar)) LogMsgNoIdent("%7d %7d %7d %7d %s", ar->ThisAPInterval / mDNSPlatformOneSecond, (ar->LastAPTime + ar->ThisAPInterval - now) / mDNSPlatformOneSecond, ar->expire ? (ar->expire - now) / mDNSPlatformOneSecond : 0, ar->state, ARDisplayString(m, ar)); else if (ar->ARType == AuthRecordLocalOnly) LogMsgNoIdent(" LO %s", ARDisplayString(m, ar)); else if (ar->ARType == AuthRecordP2P) LogMsgNoIdent(" PP %s", ARDisplayString(m, ar)); else LogMsgNoIdent("%7d %7d %7d %7s %s", ar->ThisAPInterval / mDNSPlatformOneSecond, ar->AnnounceCount ? (ar->LastAPTime + ar->ThisAPInterval - now) / mDNSPlatformOneSecond : 0, ar->TimeExpire ? (ar->TimeExpire - now) / mDNSPlatformOneSecond : 0, ifname ? ifname : "ALL", ARDisplayString(m, ar)); usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000); } } if (showheader) LogMsgNoIdent(""); } mDNSexport void udsserver_info(mDNS *const m) { const mDNSs32 now = mDNS_TimeNow(m); mDNSu32 CacheUsed = 0, CacheActive = 0, slot; int ProxyA = 0, ProxyD = 0; const CacheGroup *cg; const CacheRecord *cr; const DNSQuestion *q; const DNameListElem *d; const SearchListElem *s; LogMsgNoIdent("Timenow 0x%08lX (%d)", (mDNSu32)now, now); LogMsgNoIdent("------------ Cache -------------"); LogMsgNoIdent("Slt Q TTL if U Type rdlen"); for (slot = 0; slot < CACHE_HASH_SLOTS; slot++) for (cg = m->rrcache_hash[slot]; cg; cg=cg->next) { CacheUsed++; // Count one cache entity for the CacheGroup object for (cr = cg->members; cr; cr=cr->next) { const mDNSs32 remain = cr->resrec.rroriginalttl - (now - cr->TimeRcvd) / mDNSPlatformOneSecond; const char *ifname; mDNSInterfaceID InterfaceID = cr->resrec.InterfaceID; if (!InterfaceID && cr->resrec.rDNSServer) InterfaceID = cr->resrec.rDNSServer->interface; ifname = InterfaceNameForID(m, InterfaceID); CacheUsed++; if (cr->CRActiveQuestion) CacheActive++; LogMsgNoIdent("%3d %s%8ld %-7s%s %-6s%s", slot, cr->CRActiveQuestion ? "*" : " ", remain, ifname ? ifname : "-U-", (cr->resrec.RecordType == kDNSRecordTypePacketNegative) ? "-" : (cr->resrec.RecordType & kDNSRecordTypePacketUniqueMask) ? " " : "+", DNSTypeName(cr->resrec.rrtype), CRDisplayString(m, cr)); usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000); } } if (m->rrcache_totalused != CacheUsed) LogMsgNoIdent("Cache use mismatch: rrcache_totalused is %lu, true count %lu", m->rrcache_totalused, CacheUsed); if (m->rrcache_active != CacheActive) LogMsgNoIdent("Cache use mismatch: rrcache_active is %lu, true count %lu", m->rrcache_active, CacheActive); LogMsgNoIdent("Cache currently contains %lu entities; %lu referenced by active questions", CacheUsed, CacheActive); LogMsgNoIdent("--------- Auth Records ---------"); LogAuthRecords(m, now, m->ResourceRecords, mDNSNULL); LogMsgNoIdent("--------- LocalOnly, P2P Auth Records ---------"); LogLocalOnlyAuthRecords(m); LogMsgNoIdent("--------- /etc/hosts ---------"); LogEtcHosts(m); LogMsgNoIdent("------ Duplicate Records -------"); LogAuthRecords(m, now, m->DuplicateRecords, mDNSNULL); LogMsgNoIdent("----- Auth Records Proxied -----"); LogAuthRecords(m, now, m->ResourceRecords, &ProxyA); LogMsgNoIdent("-- Duplicate Records Proxied ---"); LogAuthRecords(m, now, m->DuplicateRecords, &ProxyD); LogMsgNoIdent("---------- Questions -----------"); if (!m->Questions) LogMsgNoIdent(""); else { CacheUsed = 0; CacheActive = 0; LogMsgNoIdent(" Int Next if T NumAns VDNS Qptr DupOf SU SQ Type Name"); for (q = m->Questions; q; q=q->next) { mDNSs32 i = q->ThisQInterval / mDNSPlatformOneSecond; mDNSs32 n = (NextQSendTime(q) - now) / mDNSPlatformOneSecond; char *ifname = InterfaceNameForID(m, q->InterfaceID); CacheUsed++; if (q->ThisQInterval) CacheActive++; LogMsgNoIdent("%6d%6d %-7s%s%s %5d 0x%x%x 0x%p 0x%p %1d %2d %-5s%##s%s", i, n, ifname ? ifname : mDNSOpaque16IsZero(q->TargetQID) ? "" : "-U-", mDNSOpaque16IsZero(q->TargetQID) ? (q->LongLived ? "l" : " ") : (q->LongLived ? "L" : "O"), PrivateQuery(q) ? "P" : " ", q->CurrentAnswers, q->validDNSServers.l[1], q->validDNSServers.l[0], q, q->DuplicateOf, q->SuppressUnusable, q->SuppressQuery, DNSTypeName(q->qtype), q->qname.c, q->DuplicateOf ? " (dup)" : ""); usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000); } LogMsgNoIdent("%lu question%s; %lu active", CacheUsed, CacheUsed > 1 ? "s" : "", CacheActive); } LogMsgNoIdent("----- Local-Only Questions -----"); if (!m->LocalOnlyQuestions) LogMsgNoIdent(""); else for (q = m->LocalOnlyQuestions; q; q=q->next) LogMsgNoIdent(" %5d %-6s%##s%s", q->CurrentAnswers, DNSTypeName(q->qtype), q->qname.c, q->DuplicateOf ? " (dup)" : ""); LogMsgNoIdent("---- Active Client Requests ----"); if (!all_requests) LogMsgNoIdent(""); else { const request_state *req, *r; for (req = all_requests; req; req=req->next) { if (req->primary) // If this is a subbordinate operation, check that the parent is in the list { for (r = all_requests; r && r != req; r=r->next) if (r == req->primary) goto foundparent; LogMsgNoIdent("%3d: Orhpan operation %p; parent %p not found in request list", req->sd); } // For non-subbordinate operations, and subbordinate operations that have lost their parent, write out their info LogClientInfo(m, req); foundparent:; } } LogMsgNoIdent("-------- NAT Traversals --------"); if (!m->NATTraversals) LogMsgNoIdent(""); else { const NATTraversalInfo *nat; for (nat = m->NATTraversals; nat; nat=nat->next) { if (nat->Protocol) LogMsgNoIdent("%p %s Int %5d Ext %5d Err %d Retry %5d Interval %5d Expire %5d", nat, nat->Protocol == NATOp_MapTCP ? "TCP" : "UDP", mDNSVal16(nat->IntPort), mDNSVal16(nat->ExternalPort), nat->Result, nat->retryPortMap ? (nat->retryPortMap - now) / mDNSPlatformOneSecond : 0, nat->retryInterval / mDNSPlatformOneSecond, nat->ExpiryTime ? (nat->ExpiryTime - now) / mDNSPlatformOneSecond : 0); else LogMsgNoIdent("%p Address Request Retry %5d Interval %5d", nat, (m->retryGetAddr - now) / mDNSPlatformOneSecond, m->retryIntervalGetAddr / mDNSPlatformOneSecond); usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000); } } LogMsgNoIdent("--------- AuthInfoList ---------"); if (!m->AuthInfoList) LogMsgNoIdent(""); else { const DomainAuthInfo *a; for (a = m->AuthInfoList; a; a = a->next) LogMsgNoIdent("%##s %##s %##s %d %s", a->domain.c, a->keyname.c, a->hostname.c, (a->port.b[0] << 8 | a->port.b[1]), a->AutoTunnel ? a->AutoTunnel : ""); } #if APPLE_OSX_mDNSResponder LogMsgNoIdent("--------- TunnelClients --------"); if (!m->TunnelClients) LogMsgNoIdent(""); else { const ClientTunnel *c; for (c = m->TunnelClients; c; c = c->next) LogMsgNoIdent("%s %##s local %.16a %.4a %.16a remote %.16a %.4a %5d %.16a interval %d", c->prefix, c->dstname.c, &c->loc_inner, &c->loc_outer, &c->loc_outer6, &c->rmt_inner, &c->rmt_outer, mDNSVal16(c->rmt_outer_port), &c->rmt_outer6, c->q.ThisQInterval); } #endif // APPLE_OSX_mDNSResponder LogMsgNoIdent("---------- Misc State ----------"); LogMsgNoIdent("PrimaryMAC: %.6a", &m->PrimaryMAC); LogMsgNoIdent("m->SleepState %d (%s) seq %d", m->SleepState, m->SleepState == SleepState_Awake ? "Awake" : m->SleepState == SleepState_Transferring ? "Transferring" : m->SleepState == SleepState_Sleeping ? "Sleeping" : "?", m->SleepSeqNum); if (!m->SPSSocket) LogMsgNoIdent("Not offering Sleep Proxy Service"); else LogMsgNoIdent("Offering Sleep Proxy Service: %#s", m->SPSRecords.RR_SRV.resrec.name->c); if (m->ProxyRecords == ProxyA + ProxyD) LogMsgNoIdent("ProxyRecords: %d + %d = %d", ProxyA, ProxyD, ProxyA + ProxyD); else LogMsgNoIdent("ProxyRecords: MISMATCH %d + %d = %d ≠ %d", ProxyA, ProxyD, ProxyA + ProxyD, m->ProxyRecords); LogMsgNoIdent("------ Auto Browse Domains -----"); if (!AutoBrowseDomains) LogMsgNoIdent(""); else for (d=AutoBrowseDomains; d; d=d->next) LogMsgNoIdent("%##s", d->name.c); LogMsgNoIdent("--- Auto Registration Domains --"); if (!AutoRegistrationDomains) LogMsgNoIdent(""); else for (d=AutoRegistrationDomains; d; d=d->next) LogMsgNoIdent("%##s", d->name.c); LogMsgNoIdent("--- Search Domains --"); if (!SearchList) LogMsgNoIdent(""); else { for (s=SearchList; s; s=s->next) { char *ifname = InterfaceNameForID(m, s->InterfaceID); LogMsgNoIdent("%##s %s", s->domain.c, ifname ? ifname : ""); } } LogMsgNoIdent("---- Task Scheduling Timers ----"); if (!m->NewQuestions) LogMsgNoIdent("NewQuestion "); else LogMsgNoIdent("NewQuestion DelayAnswering %d %d %##s (%s)", m->NewQuestions->DelayAnswering, m->NewQuestions->DelayAnswering-now, m->NewQuestions->qname.c, DNSTypeName(m->NewQuestions->qtype)); if (!m->NewLocalOnlyQuestions) LogMsgNoIdent("NewLocalOnlyQuestions "); else LogMsgNoIdent("NewLocalOnlyQuestions %##s (%s)", m->NewLocalOnlyQuestions->qname.c, DNSTypeName(m->NewLocalOnlyQuestions->qtype)); if (!m->NewLocalRecords) LogMsgNoIdent("NewLocalRecords "); else LogMsgNoIdent("NewLocalRecords %02X %s", m->NewLocalRecords->resrec.RecordType, ARDisplayString(m, m->NewLocalRecords)); LogMsgNoIdent("SPSProxyListChanged%s", m->SPSProxyListChanged ? "" : " "); LogMsgNoIdent("LocalRemoveEvents%s", m->LocalRemoveEvents ? "" : " "); LogMsgNoIdent("m->RegisterAutoTunnel6 %08X", m->RegisterAutoTunnel6); LogMsgNoIdent("m->AutoTunnelRelayAddrIn %.16a", &m->AutoTunnelRelayAddrIn); LogMsgNoIdent("m->AutoTunnelRelayAddrOut %.16a", &m->AutoTunnelRelayAddrOut); #define LogTimer(MSG,T) LogMsgNoIdent( MSG " %08X %11d %08X %11d", (T), (T), (T)-now, (T)-now) LogMsgNoIdent(" ABS (hex) ABS (dec) REL (hex) REL (dec)"); LogMsgNoIdent("m->timenow %08X %11d", now, now); LogMsgNoIdent("m->timenow_adjust %08X %11d", m->timenow_adjust, m->timenow_adjust); LogTimer("m->NextScheduledEvent ", m->NextScheduledEvent); #ifndef UNICAST_DISABLED LogTimer("m->NextuDNSEvent ", m->NextuDNSEvent); LogTimer("m->NextSRVUpdate ", m->NextSRVUpdate); LogTimer("m->NextScheduledNATOp ", m->NextScheduledNATOp); LogTimer("m->retryGetAddr ", m->retryGetAddr); #endif LogTimer("m->NextCacheCheck ", m->NextCacheCheck); LogTimer("m->NextScheduledSPS ", m->NextScheduledSPS); LogTimer("m->NextScheduledSPRetry ", m->NextScheduledSPRetry); LogTimer("m->DelaySleep ", m->DelaySleep); LogTimer("m->NextScheduledQuery ", m->NextScheduledQuery); LogTimer("m->NextScheduledProbe ", m->NextScheduledProbe); LogTimer("m->NextScheduledResponse", m->NextScheduledResponse); LogTimer("m->SuppressSending ", m->SuppressSending); LogTimer("m->SuppressProbes ", m->SuppressProbes); LogTimer("m->ProbeFailTime ", m->ProbeFailTime); LogTimer("m->DelaySleep ", m->DelaySleep); LogTimer("m->SleepLimit ", m->SleepLimit); LogTimer("m->NextScheduledStopTime ", m->NextScheduledStopTime); } #if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING mDNSexport void uds_validatelists(void) { const request_state *req, *p; for (req = all_requests; req; req=req->next) { if (req->next == (request_state *)~0 || (req->sd < 0 && req->sd != -2)) LogMemCorruption("UDS request list: %p is garbage (%d)", req, req->sd); if (req->primary == req) LogMemCorruption("UDS request list: req->primary should not point to self %p/%d", req, req->sd); if (req->primary && req->replies) LogMemCorruption("UDS request list: Subordinate request %p/%d/%p should not have replies (%p)", req, req->sd, req->primary && req->replies); p = req->primary; if ((long)p & 3) LogMemCorruption("UDS request list: req %p primary %p is misaligned (%d)", req, p, req->sd); else if (p && (p->next == (request_state *)~0 || (p->sd < 0 && p->sd != -2))) LogMemCorruption("UDS request list: req %p primary %p is garbage (%d)", req, p, p->sd); reply_state *rep; for (rep = req->replies; rep; rep=rep->next) if (rep->next == (reply_state *)~0) LogMemCorruption("UDS req->replies: %p is garbage", rep); if (req->terminate == connection_termination) { registered_record_entry *r; for (r = req->u.reg_recs; r; r=r->next) if (r->next == (registered_record_entry *)~0) LogMemCorruption("UDS req->u.reg_recs: %p is garbage", r); } else if (req->terminate == regservice_termination_callback) { service_instance *s; for (s = req->u.servicereg.instances; s; s=s->next) if (s->next == (service_instance *)~0) LogMemCorruption("UDS req->u.servicereg.instances: %p is garbage", s); } else if (req->terminate == browse_termination_callback) { browser_t *b; for (b = req->u.browser.browsers; b; b=b->next) if (b->next == (browser_t *)~0) LogMemCorruption("UDS req->u.browser.browsers: %p is garbage", b); } } DNameListElem *d; for (d = SCPrefBrowseDomains; d; d=d->next) if (d->next == (DNameListElem *)~0 || d->name.c[0] > 63) LogMemCorruption("SCPrefBrowseDomains: %p is garbage (%d)", d, d->name.c[0]); ARListElem *b; for (b = LocalDomainEnumRecords; b; b=b->next) if (b->next == (ARListElem *)~0 || b->ar.resrec.name->c[0] > 63) LogMemCorruption("LocalDomainEnumRecords: %p is garbage (%d)", b, b->ar.resrec.name->c[0]); for (d = AutoBrowseDomains; d; d=d->next) if (d->next == (DNameListElem *)~0 || d->name.c[0] > 63) LogMemCorruption("AutoBrowseDomains: %p is garbage (%d)", d, d->name.c[0]); for (d = AutoRegistrationDomains; d; d=d->next) if (d->next == (DNameListElem *)~0 || d->name.c[0] > 63) LogMemCorruption("AutoRegistrationDomains: %p is garbage (%d)", d, d->name.c[0]); } #endif // APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING mDNSlocal int send_msg(request_state *const req) { reply_state *const rep = req->replies; // Send the first waiting reply ssize_t nwriten; if (req->no_reply) return(t_complete); ConvertHeaderBytes(rep->mhdr); nwriten = send(req->sd, (char *)&rep->mhdr + rep->nwriten, rep->totallen - rep->nwriten, 0); ConvertHeaderBytes(rep->mhdr); if (nwriten < 0) { if (dnssd_errno == dnssd_EINTR || dnssd_errno == dnssd_EWOULDBLOCK) nwriten = 0; else { #if !defined(PLATFORM_NO_EPIPE) if (dnssd_errno == EPIPE) return(req->ts = t_terminated); else #endif { LogMsg("send_msg ERROR: failed to write %d of %d bytes to fd %d errno %d (%s)", rep->totallen - rep->nwriten, rep->totallen, req->sd, dnssd_errno, dnssd_strerror(dnssd_errno)); return(t_error); } } } rep->nwriten += nwriten; return (rep->nwriten == rep->totallen) ? t_complete : t_morecoming; } mDNSexport mDNSs32 udsserver_idle(mDNSs32 nextevent) { mDNSs32 now = mDNS_TimeNow(&mDNSStorage); request_state **req = &all_requests; while (*req) { request_state *const r = *req; if (r->terminate == resolve_termination_callback) if (r->u.resolve.ReportTime && now - r->u.resolve.ReportTime >= 0) { r->u.resolve.ReportTime = 0; LogMsgNoIdent("Client application bug: DNSServiceResolve(%##s) active for over two minutes. " "This places considerable burden on the network.", r->u.resolve.qsrv.qname.c); } // Note: Only primary req's have reply lists, not subordinate req's. while (r->replies) // Send queued replies { transfer_state result; if (r->replies->next) r->replies->rhdr->flags |= dnssd_htonl(kDNSServiceFlagsMoreComing); result = send_msg(r); // Returns t_morecoming if buffer full because client is not reading if (result == t_complete) { reply_state *fptr = r->replies; r->replies = r->replies->next; freeL("reply_state/udsserver_idle", fptr); r->time_blocked = 0; // reset failure counter after successful send r->unresponsiveness_reports = 0; continue; } else if (result == t_terminated || result == t_error) { LogMsg("%3d: Could not write data to client because of error - aborting connection", r->sd); LogClientInfo(&mDNSStorage, r); abort_request(r); } break; } if (r->replies) // If we failed to send everything, check our time_blocked timer { if (nextevent - now > mDNSPlatformOneSecond) nextevent = now + mDNSPlatformOneSecond; if (mDNSStorage.SleepState != SleepState_Awake) r->time_blocked = 0; else if (!r->time_blocked) r->time_blocked = NonZeroTime(now); else if (now - r->time_blocked >= 10 * mDNSPlatformOneSecond * (r->unresponsiveness_reports+1)) { int num = 0; struct reply_state *x = r->replies; while (x) { num++; x=x->next; } LogMsg("%3d: Could not write data to client after %ld seconds, %d repl%s waiting", r->sd, (now - r->time_blocked) / mDNSPlatformOneSecond, num, num == 1 ? "y" : "ies"); if (++r->unresponsiveness_reports >= 60) { LogMsg("%3d: Client unresponsive; aborting connection", r->sd); LogClientInfo(&mDNSStorage, r); abort_request(r); } } } if (!dnssd_SocketValid(r->sd)) // If this request is finished, unlink it from the list and free the memory { // Since we're already doing a list traversal, we unlink the request directly instead of using AbortUnlinkAndFree() *req = r->next; freeL("request_state/udsserver_idle", r); } else req = &r->next; } return nextevent; } struct CompileTimeAssertionChecks_uds_daemon { // Check our structures are reasonable sizes. Including overly-large buffers, or embedding // other overly-large structures instead of having a pointer to them, can inadvertently // cause structure sizes (and therefore memory usage) to balloon unreasonably. char sizecheck_request_state [(sizeof(request_state) <= 1784) ? 1 : -1]; char sizecheck_registered_record_entry[(sizeof(registered_record_entry) <= 60) ? 1 : -1]; char sizecheck_service_instance [(sizeof(service_instance) <= 6552) ? 1 : -1]; char sizecheck_browser_t [(sizeof(browser_t) <= 1050) ? 1 : -1]; char sizecheck_reply_hdr [(sizeof(reply_hdr) <= 12) ? 1 : -1]; char sizecheck_reply_state [(sizeof(reply_state) <= 64) ? 1 : -1]; };