/* -*- Mode: C; tab-width: 4 -*- * * Copyright (c) 2004-2015 Apple Inc. All rights reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include // Needed for fopen() etc. #include // Needed for close() #include // Needed for strlen() etc. #include // Needed for errno etc. #include // Needed for socket() etc. #include // Needed for sockaddr_in #include #if APPLE_OSX_mDNSResponder #include #endif #include "mDNSEmbeddedAPI.h" // Defines the interface provided to the client layer above #include "DNSCommon.h" #include "PlatformCommon.h" #ifdef NOT_HAVE_SOCKLEN_T typedef unsigned int socklen_t; #endif // Bind a UDP socket to find the source address to a destination mDNSexport void mDNSPlatformSourceAddrForDest(mDNSAddr *const src, const mDNSAddr *const dst) { union { struct sockaddr s; struct sockaddr_in a4; struct sockaddr_in6 a6; } addr; socklen_t len = sizeof(addr); socklen_t inner_len = 0; int sock = socket(AF_INET, SOCK_DGRAM, 0); src->type = mDNSAddrType_None; if (sock == -1) return; memset(&addr, 0, sizeof(addr)); if (dst->type == mDNSAddrType_IPv4) { inner_len = sizeof(addr.a4); #ifndef NOT_HAVE_SA_LEN addr.a4.sin_len = inner_len; #endif addr.a4.sin_family = AF_INET; addr.a4.sin_port = 7; // Not important, any port will do addr.a4.sin_addr.s_addr = dst->ip.v4.NotAnInteger; } else if (dst->type == mDNSAddrType_IPv6) { inner_len = sizeof(addr.a6); #ifndef NOT_HAVE_SA_LEN addr.a6.sin6_len = inner_len; #endif addr.a6.sin6_family = AF_INET6; addr.a6.sin6_flowinfo = 0; addr.a6.sin6_port = 7; // Not important, any port will do addr.a6.sin6_addr = *(struct in6_addr*)&dst->ip.v6; addr.a6.sin6_scope_id = 0; } else return; if ((connect(sock, &addr.s, inner_len)) < 0) { static mDNSv4Addr dummy = { 198, 51, 100, 42 }; // Don't spam if we can't connect to 198.51.100.42 to the console. // That is our test address to out which interfaces/address should be primary and is also // configured in mDNSPosix/PosixDaemon.c:Reconfigure() // Failing to connect to it with EADDRNOTAVAIL is a common situation, especially on boot up. if (dst->type == mDNSAddrType_IPv4 && dst->ip.v4.NotAnInteger == dummy.NotAnInteger && errno == EADDRNOTAVAIL) LogInfo("mDNSPlatformSourceAddrForDest: connect %#a failed errno %d (%s)", dst, errno, strerror(errno)); else LogMsg("mDNSPlatformSourceAddrForDest: connect %#a failed errno %d (%s)", dst, errno, strerror(errno)); goto exit; } if ((getsockname(sock, &addr.s, &len)) < 0) { LogMsg("mDNSPlatformSourceAddrForDest: getsockname failed errno %d (%s)", errno, strerror(errno)); goto exit; } src->type = dst->type; if (dst->type == mDNSAddrType_IPv4) src->ip.v4.NotAnInteger = addr.a4.sin_addr.s_addr; else src->ip.v6 = *(mDNSv6Addr*)&addr.a6.sin6_addr; exit: close(sock); } // dst must be at least MAX_ESCAPED_DOMAIN_NAME bytes, and option must be less than 32 bytes in length mDNSlocal mDNSBool GetConfigOption(char *dst, const char *option, FILE *f) { char buf[32+1+MAX_ESCAPED_DOMAIN_NAME]; // Option name, one space, option value unsigned int len = strlen(option); if (len + 1 + MAX_ESCAPED_DOMAIN_NAME > sizeof(buf)-1) { LogMsg("GetConfigOption: option %s too long", option); return mDNSfalse; } fseek(f, 0, SEEK_SET); // set position to beginning of stream while (fgets(buf, sizeof(buf), f)) // Read at most sizeof(buf)-1 bytes from file, and append '\0' C-string terminator { if (!strncmp(buf, option, len)) { strncpy(dst, buf + len + 1, MAX_ESCAPED_DOMAIN_NAME-1); if (dst[MAX_ESCAPED_DOMAIN_NAME-1]) dst[MAX_ESCAPED_DOMAIN_NAME-1] = '\0'; len = strlen(dst); if (len && dst[len-1] == '\n') dst[len-1] = '\0'; // chop newline return mDNStrue; } } debugf("Option %s not set", option); return mDNSfalse; } mDNSexport void ReadDDNSSettingsFromConfFile(mDNS *const m, const char *const filename, domainname *const hostname, domainname *const domain, mDNSBool *DomainDiscoveryDisabled) { char buf[MAX_ESCAPED_DOMAIN_NAME] = ""; mStatus err; FILE *f = fopen(filename, "r"); if (hostname) hostname->c[0] = 0; if (domain) domain->c[0] = 0; if (DomainDiscoveryDisabled) *DomainDiscoveryDisabled = mDNSfalse; if (f) { if (DomainDiscoveryDisabled && GetConfigOption(buf, "DomainDiscoveryDisabled", f) && !strcasecmp(buf, "true")) *DomainDiscoveryDisabled = mDNStrue; if (hostname && GetConfigOption(buf, "hostname", f) && !MakeDomainNameFromDNSNameString(hostname, buf)) goto badf; if (domain && GetConfigOption(buf, "zone", f) && !MakeDomainNameFromDNSNameString(domain, buf)) goto badf; buf[0] = 0; GetConfigOption(buf, "secret-64", f); // failure means no authentication fclose(f); f = NULL; } else { if (errno != ENOENT) LogMsg("ERROR: Config file exists, but cannot be opened."); return; } if (domain && domain->c[0] && buf[0]) { DomainAuthInfo *info = (DomainAuthInfo*)mDNSPlatformMemAllocate(sizeof(*info)); // for now we assume keyname = service reg domain and we use same key for service and hostname registration err = mDNS_SetSecretForDomain(m, info, domain, domain, buf, NULL, 0, mDNSfalse); if (err) LogMsg("ERROR: mDNS_SetSecretForDomain returned %d for domain %##s", err, domain->c); } return; badf: LogMsg("ERROR: malformatted config file"); if (f) fclose(f); } #if MDNS_DEBUGMSGS mDNSexport void mDNSPlatformWriteDebugMsg(const char *msg) { fprintf(stderr,"%s\n", msg); fflush(stderr); } #endif mDNSexport void mDNSPlatformWriteLogMsg(const char *ident, const char *buffer, mDNSLogLevel_t loglevel) { #if APPLE_OSX_mDNSResponder && LogTimeStamps extern mDNS mDNSStorage; extern mDNSu32 mDNSPlatformClockDivisor; mDNSs32 t = mDNSStorage.timenow ? mDNSStorage.timenow : mDNSPlatformClockDivisor ? mDNS_TimeNow_NoLock(&mDNSStorage) : 0; int ms = ((t < 0) ? -t : t) % 1000; #endif if (mDNS_DebugMode) // In debug mode we write to stderr { #if APPLE_OSX_mDNSResponder && LogTimeStamps if (ident && ident[0] && mDNSPlatformClockDivisor) fprintf(stderr,"%8d.%03d: %s\n", (int)(t/1000), ms, buffer); else #endif fprintf(stderr,"%s\n", buffer); fflush(stderr); } else // else, in production mode, we write to syslog { static int log_inited = 0; int syslog_level = LOG_ERR; switch (loglevel) { #if APPLE_OSX_mDNSResponder case MDNS_LOG_MSG: syslog_level = OS_LOG_TYPE_DEFAULT; break; case MDNS_LOG_OPERATION: syslog_level = OS_LOG_TYPE_INFO; break; case MDNS_LOG_SPS: syslog_level = OS_LOG_TYPE_INFO; break; case MDNS_LOG_INFO: syslog_level = OS_LOG_TYPE_INFO; break; case MDNS_LOG_DEBUG: syslog_level = OS_LOG_TYPE_DEBUG; break; default: syslog_level = OS_LOG_TYPE_DEFAULT; break; #else case MDNS_LOG_MSG: syslog_level = LOG_ERR; break; case MDNS_LOG_OPERATION: syslog_level = LOG_WARNING; break; case MDNS_LOG_SPS: syslog_level = LOG_NOTICE; break; case MDNS_LOG_INFO: syslog_level = LOG_INFO; break; case MDNS_LOG_DEBUG: syslog_level = LOG_DEBUG; break; default: fprintf(stderr, "Unknown loglevel %d, assuming LOG_ERR\n", loglevel); fflush(stderr); #endif } if (!log_inited) { openlog(ident, LOG_CONS, LOG_DAEMON); log_inited++; } #if APPLE_OSX_mDNSResponder && LogTimeStamps if (ident && ident[0] && mDNSPlatformClockDivisor) syslog(syslog_level, "%8d.%03d: %s", (int)(t/1000), ms, buffer); else #endif { #if APPLE_OSX_mDNSResponder mDNSPlatformLogToFile(syslog_level, buffer); #else syslog(syslog_level, "%s", buffer); #endif } } }