1/* -*- Mode: C; tab-width: 4 -*- 2 * 3 * Copyright (c) 2004 Apple Computer, Inc. All rights reserved. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18#include <stdio.h> // Needed for fopen() etc. 19#include <unistd.h> // Needed for close() 20#include <string.h> // Needed for strlen() etc. 21#include <errno.h> // Needed for errno etc. 22#include <sys/socket.h> // Needed for socket() etc. 23#include <netinet/in.h> // Needed for sockaddr_in 24#include <syslog.h> 25 26#include "mDNSEmbeddedAPI.h" // Defines the interface provided to the client layer above 27#include "DNSCommon.h" 28#include "PlatformCommon.h" 29 30#ifdef __ANDROID__ 31#include <android/log.h> 32#endif 33 34#ifdef NOT_HAVE_SOCKLEN_T 35 typedef unsigned int socklen_t; 36#endif 37 38// Bind a UDP socket to find the source address to a destination 39mDNSexport void mDNSPlatformSourceAddrForDest(mDNSAddr *const src, const mDNSAddr *const dst) 40 { 41 union { struct sockaddr s; struct sockaddr_in a4; struct sockaddr_in6 a6; } addr; 42 socklen_t len = sizeof(addr); 43 socklen_t inner_len = 0; 44 int sock = socket(AF_INET, SOCK_DGRAM, 0); 45 src->type = mDNSAddrType_None; 46 if (sock == -1) return; 47 if (dst->type == mDNSAddrType_IPv4) 48 { 49 inner_len = sizeof(addr.a4); 50 #ifndef NOT_HAVE_SA_LEN 51 addr.a4.sin_len = inner_len; 52 #endif 53 addr.a4.sin_family = AF_INET; 54 addr.a4.sin_port = 1; // Not important, any port will do 55 addr.a4.sin_addr.s_addr = dst->ip.v4.NotAnInteger; 56 } 57 else if (dst->type == mDNSAddrType_IPv6) 58 { 59 inner_len = sizeof(addr.a6); 60 #ifndef NOT_HAVE_SA_LEN 61 addr.a6.sin6_len = inner_len; 62 #endif 63 addr.a6.sin6_family = AF_INET6; 64 addr.a6.sin6_flowinfo = 0; 65 addr.a6.sin6_port = 1; // Not important, any port will do 66 addr.a6.sin6_addr = *(struct in6_addr*)&dst->ip.v6; 67 addr.a6.sin6_scope_id = 0; 68 } 69 else return; 70 71 if ((connect(sock, &addr.s, inner_len)) < 0) 72 { LogMsg("mDNSPlatformSourceAddrForDest: connect %#a failed errno %d (%s)", dst, errno, strerror(errno)); goto exit; } 73 74 if ((getsockname(sock, &addr.s, &len)) < 0) 75 { LogMsg("mDNSPlatformSourceAddrForDest: getsockname failed errno %d (%s)", errno, strerror(errno)); goto exit; } 76 77 src->type = dst->type; 78 if (dst->type == mDNSAddrType_IPv4) src->ip.v4.NotAnInteger = addr.a4.sin_addr.s_addr; 79 else src->ip.v6 = *(mDNSv6Addr*)&addr.a6.sin6_addr; 80exit: 81 close(sock); 82 } 83 84// dst must be at least MAX_ESCAPED_DOMAIN_NAME bytes, and option must be less than 32 bytes in length 85mDNSlocal mDNSBool GetConfigOption(char *dst, const char *option, FILE *f) 86 { 87 char buf[32+1+MAX_ESCAPED_DOMAIN_NAME]; // Option name, one space, option value 88 unsigned int len = strlen(option); 89 if (len + 1 + MAX_ESCAPED_DOMAIN_NAME > sizeof(buf)-1) { LogMsg("GetConfigOption: option %s too long", option); return mDNSfalse; } 90 fseek(f, 0, SEEK_SET); // set position to beginning of stream 91 while (fgets(buf, sizeof(buf), f)) // Read at most sizeof(buf)-1 bytes from file, and append '\0' C-string terminator 92 { 93 if (!strncmp(buf, option, len)) 94 { 95 strncpy(dst, buf + len + 1, MAX_ESCAPED_DOMAIN_NAME-1); 96 if (dst[MAX_ESCAPED_DOMAIN_NAME-1]) dst[MAX_ESCAPED_DOMAIN_NAME-1] = '\0'; 97 len = strlen(dst); 98 if (len && dst[len-1] == '\n') dst[len-1] = '\0'; // chop newline 99 return mDNStrue; 100 } 101 } 102 debugf("Option %s not set", option); 103 return mDNSfalse; 104 } 105 106mDNSexport void ReadDDNSSettingsFromConfFile(mDNS *const m, const char *const filename, domainname *const hostname, domainname *const domain, mDNSBool *DomainDiscoveryDisabled) 107 { 108 char buf[MAX_ESCAPED_DOMAIN_NAME] = ""; 109 mStatus err; 110 FILE *f = fopen(filename, "r"); 111 112 if (hostname) hostname->c[0] = 0; 113 if (domain) domain->c[0] = 0; 114 if (DomainDiscoveryDisabled) *DomainDiscoveryDisabled = mDNSfalse; 115 116 if (f) 117 { 118 if (DomainDiscoveryDisabled && GetConfigOption(buf, "DomainDiscoveryDisabled", f) && !strcasecmp(buf, "true")) *DomainDiscoveryDisabled = mDNStrue; 119 if (hostname && GetConfigOption(buf, "hostname", f) && !MakeDomainNameFromDNSNameString(hostname, buf)) goto badf; 120 if (domain && GetConfigOption(buf, "zone", f) && !MakeDomainNameFromDNSNameString(domain, buf)) goto badf; 121 buf[0] = 0; 122 GetConfigOption(buf, "secret-64", f); // failure means no authentication 123 fclose(f); 124 f = NULL; 125 } 126 else 127 { 128 if (errno != ENOENT) LogMsg("ERROR: Config file exists, but cannot be opened."); 129 return; 130 } 131 132 if (domain && domain->c[0] && buf[0]) 133 { 134 DomainAuthInfo *info = (DomainAuthInfo*)mDNSPlatformMemAllocate(sizeof(*info)); 135 // for now we assume keyname = service reg domain and we use same key for service and hostname registration 136 err = mDNS_SetSecretForDomain(m, info, domain, domain, buf, NULL, 0, NULL); 137 if (err) LogMsg("ERROR: mDNS_SetSecretForDomain returned %d for domain %##s", err, domain->c); 138 } 139 140 return; 141 142 badf: 143 LogMsg("ERROR: malformatted config file"); 144 if (f) fclose(f); 145 } 146 147#if MDNS_DEBUGMSGS 148mDNSexport void mDNSPlatformWriteDebugMsg(const char *msg) 149 { 150#ifdef __ANDROID__ 151 __android_log_print(ANDROID_LOG_DEBUG, "mdns", "%s", msg); 152#else 153 fprintf(stderr,"%s\n", msg); 154 fflush(stderr); 155#endif 156 } 157#endif 158 159mDNSexport void mDNSPlatformWriteLogMsg(const char *ident, const char *buffer, mDNSLogLevel_t loglevel) 160 { 161#if APPLE_OSX_mDNSResponder && LogTimeStamps 162 extern mDNS mDNSStorage; 163 extern mDNSu32 mDNSPlatformClockDivisor; 164 mDNSs32 t = mDNSStorage.timenow ? mDNSStorage.timenow : mDNSPlatformClockDivisor ? mDNS_TimeNow_NoLock(&mDNSStorage) : 0; 165 int ms = ((t < 0) ? -t : t) % 1000; 166#endif 167 168 if (mDNS_DebugMode) // In debug mode we write to stderr 169 { 170#if APPLE_OSX_mDNSResponder && LogTimeStamps 171 if (ident && ident[0] && mDNSPlatformClockDivisor) 172 fprintf(stderr,"%8d.%03d: %s\n", (int)(t/1000), ms, buffer); 173 else 174#endif 175 fprintf(stderr,"%s\n", buffer); 176 fflush(stderr); 177 } 178 else // else, in production mode, we write to syslog 179 { 180 static int log_inited = 0; 181 182 int syslog_level = LOG_ERR; 183 switch (loglevel) 184 { 185 case MDNS_LOG_MSG: syslog_level = LOG_ERR; break; 186 case MDNS_LOG_OPERATION: syslog_level = LOG_WARNING; break; 187 case MDNS_LOG_SPS: syslog_level = LOG_NOTICE; break; 188 case MDNS_LOG_INFO: syslog_level = LOG_INFO; break; 189 case MDNS_LOG_DEBUG: syslog_level = LOG_DEBUG; break; 190 default: 191 fprintf(stderr, "Unknown loglevel %d, assuming LOG_ERR\n", loglevel); 192 fflush(stderr); 193 } 194 195 if (!log_inited) { openlog(ident, LOG_CONS, LOG_DAEMON); log_inited++; } 196 197#if APPLE_OSX_mDNSResponder && LogTimeStamps 198 if (ident && ident[0] && mDNSPlatformClockDivisor) 199 syslog(syslog_level, "%8d.%03d: %s", (int)(t/1000), ms, buffer); 200 else 201#endif 202#ifdef __ANDROID__ 203 switch (loglevel) 204 { 205 case MDNS_LOG_DEBUG: syslog_level = ANDROID_LOG_DEBUG; break; 206#if MDNS_DEBUGMSGS > 0 207 case MDNS_LOG_OPERATION: syslog_level = ANDROID_LOG_WARN; break; 208 case MDNS_LOG_SPS: syslog_level = ANDROID_LOG_DEBUG; break; 209 case MDNS_LOG_INFO: syslog_level = ANDROID_LOG_INFO; break; 210 default: syslog_level = ANDROID_LOG_ERROR; break; 211#else 212 default: return; 213#endif 214 } 215 __android_log_print(syslog_level, "mdns", "%s", buffer); 216#else 217 syslog(syslog_level, "%s", buffer); 218#endif 219 } 220 } 221