4b22b9337f359bfd063322244f5336cc7c6ffcfars/* -*- Mode: C; tab-width: 4 -*-
4b22b9337f359bfd063322244f5336cc7c6ffcfars * Copyright (c) 2003-2004 Apple Computer, Inc. All rights reserved.
4b22b9337f359bfd063322244f5336cc7c6ffcfars * Licensed under the Apache License, Version 2.0 (the "License");
4b22b9337f359bfd063322244f5336cc7c6ffcfars * you may not use this file except in compliance with the License.
4b22b9337f359bfd063322244f5336cc7c6ffcfars * You may obtain a copy of the License at
4b22b9337f359bfd063322244f5336cc7c6ffcfars * Unless required by applicable law or agreed to in writing, software
4b22b9337f359bfd063322244f5336cc7c6ffcfars * distributed under the License is distributed on an "AS IS" BASIS,
4b22b9337f359bfd063322244f5336cc7c6ffcfars * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
4b22b9337f359bfd063322244f5336cc7c6ffcfars * See the License for the specific language governing permissions and
4b22b9337f359bfd063322244f5336cc7c6ffcfars * limitations under the License.
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome Contains: main & associated Application layer for mDNSResponder on Linux.
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome// In Mac OS X 10.5 and later trying to use the daemon function gives a “‘daemon’ is deprecated”
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome// error, which prevents compilation because we build with "-Werror".
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome// Since this is supposed to be portable cross-platform code, we don't care that daemon is
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome// deprecated on Mac OS X 10.5, so we use this preprocessor trick to eliminate the error message.
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome#define daemon yes_we_know_that_daemon_is_deprecated_in_os_x_10_5_thankyou
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soomeextern int daemon(int, int);
4b22b9337f359bfd063322244f5336cc7c6ffcfarsstatic domainname DynDNSZone; // Default wide-area zone for service registration
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas SoomemDNSlocal void mDNS_StatusCallback(mDNS *const m, mStatus result)
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome (void)m; // Unused
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome // On successful registration of dot-local mDNS host name, daemon may want to check if
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome // any name conflict and automatic renaming took place, and if so, record the newly negotiated
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome // name in persistent storage for next time. It should also inform the user of the name change.
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome // On Mac OS X we store the current dot-local mDNS host name in the SCPreferences store,
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome // and notify the user with a CFUserNotification.
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome // Allocate another chunk of cache storage
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome CacheEntity *storage = malloc(sizeof(CacheEntity) * RR_CACHE_SIZE);
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome if (storage) mDNS_GrowCache(m, storage, RR_CACHE_SIZE);
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome// %%% Reconfigure() probably belongs in the platform support layer (mDNSPosix.c), not the daemon cde
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome// -- all client layers running on top of mDNSPosix.c need to handle network configuration changes,
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome// not only the Unix Domain Socket Daemon
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome const mDNSAddr dummy = { mDNSAddrType_IPv4, { { { 1, 1, 1, 1 } } } };;
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome mDNS_SetPrimaryInterfaceInfo(m, NULL, NULL, NULL);
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome LogMsg("Unable to parse DNS server list. Unicast DNS-SD unavailable");
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome ReadDDNSSettingsFromConfFile(m, CONFIG_FILE, &DynDNSHostname, &DynDNSZone, NULL);
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome mDNSPlatformSourceAddrForDest(&DynDNSIP, &dummy);
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome if (DynDNSHostname.c[0]) mDNS_AddDynDNSHostName(m, &DynDNSHostname, NULL, NULL);
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome if (DynDNSIP.type) mDNS_SetPrimaryInterfaceInfo(m, &DynDNSIP, NULL, NULL);
4b22b9337f359bfd063322244f5336cc7c6ffcfars// Do appropriate things at startup with command line arguments. Calls exit() if unhappy.
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas SoomemDNSlocal void ParseCmdLinArgs(int argc, char **argv)
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome if (0 == strcmp(argv[1], "-debug")) mDNS_DebugMode = mDNStrue;
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome if (result != 0) { LogMsg("Could not run as daemon - exiting"); exit(result); }
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome LogMsg("The POSIX mdnsd should only be used on OS X for testing - exiting");
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome mDNS_PacketLoggingEnabled = !mDNS_PacketLoggingEnabled;
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome// Dump a little log of what we've been up to.
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas SoomemDNSlocal mStatus MainLoop(mDNS *m) // Loop until we quit.
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome // Work out how long we expect to sleep before the next scheduled task
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome // Only idle if we didn't find any data the last time around
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome nextTimerEvent = udsserver_idle(nextTimerEvent);
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome else // otherwise call EventLoop again with 0 timemout
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome timeout.tv_sec = ticks / mDNSPlatformOneSecond;
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome timeout.tv_usec = (ticks % mDNSPlatformOneSecond) * 1000000 / mDNSPlatformOneSecond;
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome (void) mDNSPosixRunEventLoopOnce(m, &timeout, &signals, &gotData);
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome if (sigismember(&signals, SIGHUP )) Reconfigure(m);
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome if (sigismember(&signals, SIGINFO)) DumpStateLog(m);
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome if (sigismember(&signals, SIGUSR1)) ToggleLog();
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome if (sigismember(&signals, SIGUSR2)) ToggleLogPacket();
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome // SIGPIPE happens when we try to write to a dead client; death should be detected soon in request_callback() and cleaned up.
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome if (sigismember(&signals, SIGPIPE)) LogMsg("Received SIGPIPE - ignoring");
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome if (sigismember(&signals, SIGINT) || sigismember(&signals, SIGTERM)) break;
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome LogInfo("%s starting", mDNSResponderVersionString);
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome err = mDNS_Init(&mDNSStorage, &PlatformStorage, gRRCache, RR_CACHE_SIZE, mDNS_Init_AdvertiseLocalAddresses,
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome mDNS_StatusCallback, mDNS_Init_NoInitCallbackContext);
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome // Now that we're finished with anything privileged, switch over to running as "nobody"
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome const struct passwd *pw = getpwnam(MDNSD_USER);
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome LogMsg("WARNING: mdnsd exiting because user \""MDNSD_USER"\" does not exist");
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome LogMsg("WARNING: mdnsd continuing as root because user \""MDNSD_USER"\" does not exist");
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome LogInfo("%s stopping", mDNSResponderVersionString);
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome printf("mDNSResponder exiting normally with %ld\n", err);
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome// uds_daemon support ////////////////////////////////////////////////////////////
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas SoomemStatus udsSupportAddFDToEventLoop(int fd, udsEventCallback callback, void *context, void **platform_data)
4b22b9337f359bfd063322244f5336cc7c6ffcfars/* Support routine for uds_daemon.c */
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome // Depends on the fact that udsEventCallback == mDNSPosixEventCallback
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome return mDNSPosixAddFDToEventLoop(fd, callback, context);
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soomeint udsSupportReadFD(dnssd_sock_t fd, char *buf, int len, int flags, void *platform_data)
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas SoomemStatus udsSupportRemoveFDFromEventLoop(int fd, void *platform_data) // Note: This also CLOSES the file descriptor
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome mStatus err = mDNSPosixRemoveFDFromEventLoop(fd);
4b22b9337f359bfd063322244f5336cc7c6ffcfarsmDNSexport void RecordUpdatedNiceLabel(mDNS *const m, mDNSs32 delay)
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome // No-op, for now
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soome// If the process crashes, then this string will be magically included in the automatically-generated crash log
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soomeconst char *__crashreporter_info__ = mDNSResponderVersionString_SCCS + 5;
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas Soomeasm (".desc ___crashreporter_info__, 0x10");
4b22b9337f359bfd063322244f5336cc7c6ffcfars// For convenience when using the "strings" command, this is the last thing in the file
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas SoomemDNSexport const char mDNSResponderVersionString_SCCS[] = "@(#) mDNSResponder-" STRINGIFY(mDNSResponderVersion) " (" __DATE__ " " __TIME__ ")";
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas SoomemDNSexport const char mDNSResponderVersionString_SCCS[] = "@(#) mDNSResponder (Engineering Build)";
5ffb0c9b03b5149ff4f5821a62be4a52408ada2aToomas SoomemDNSexport const char mDNSResponderVersionString_SCCS[] = "@(#) mDNSResponder (Engineering Build) (" __DATE__ " " __TIME__ ")";