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
mDNSPlatformSourceAddrForDest(mDNSAddr * const src,const mDNSAddr * const dst)39 mDNSexport 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
70 {
71 // __ANDROID__ : Fix fd leak
72 goto exit;
73 }
74
75
76 if ((connect(sock, &addr.s, inner_len)) < 0)
77 { LogMsg("mDNSPlatformSourceAddrForDest: connect %#a failed errno %d (%s)", dst, errno, strerror(errno)); goto exit; }
78
79 if ((getsockname(sock, &addr.s, &len)) < 0)
80 { LogMsg("mDNSPlatformSourceAddrForDest: getsockname failed errno %d (%s)", errno, strerror(errno)); goto exit; }
81
82 src->type = dst->type;
83 if (dst->type == mDNSAddrType_IPv4) src->ip.v4.NotAnInteger = addr.a4.sin_addr.s_addr;
84 else src->ip.v6 = *(mDNSv6Addr*)&addr.a6.sin6_addr;
85 exit:
86 close(sock);
87 }
88
89 // dst must be at least MAX_ESCAPED_DOMAIN_NAME bytes, and option must be less than 32 bytes in length
GetConfigOption(char * dst,const char * option,FILE * f)90 mDNSlocal mDNSBool GetConfigOption(char *dst, const char *option, FILE *f)
91 {
92 char buf[32+1+MAX_ESCAPED_DOMAIN_NAME]; // Option name, one space, option value
93 unsigned int len = strlen(option);
94 if (len + 1 + MAX_ESCAPED_DOMAIN_NAME > sizeof(buf)-1) { LogMsg("GetConfigOption: option %s too long", option); return mDNSfalse; }
95 fseek(f, 0, SEEK_SET); // set position to beginning of stream
96 while (fgets(buf, sizeof(buf), f)) // Read at most sizeof(buf)-1 bytes from file, and append '\0' C-string terminator
97 {
98 if (!strncmp(buf, option, len))
99 {
100 strncpy(dst, buf + len + 1, MAX_ESCAPED_DOMAIN_NAME-1);
101 if (dst[MAX_ESCAPED_DOMAIN_NAME-1]) dst[MAX_ESCAPED_DOMAIN_NAME-1] = '\0';
102 len = strlen(dst);
103 if (len && dst[len-1] == '\n') dst[len-1] = '\0'; // chop newline
104 return mDNStrue;
105 }
106 }
107 debugf("Option %s not set", option);
108 return mDNSfalse;
109 }
110
ReadDDNSSettingsFromConfFile(mDNS * const m,const char * const filename,domainname * const hostname,domainname * const domain,mDNSBool * DomainDiscoveryDisabled)111 mDNSexport void ReadDDNSSettingsFromConfFile(mDNS *const m, const char *const filename, domainname *const hostname, domainname *const domain, mDNSBool *DomainDiscoveryDisabled)
112 {
113 char buf[MAX_ESCAPED_DOMAIN_NAME] = "";
114 mStatus err;
115 FILE *f = fopen(filename, "r");
116
117 if (hostname) hostname->c[0] = 0;
118 if (domain) domain->c[0] = 0;
119 if (DomainDiscoveryDisabled) *DomainDiscoveryDisabled = mDNSfalse;
120
121 if (f)
122 {
123 if (DomainDiscoveryDisabled && GetConfigOption(buf, "DomainDiscoveryDisabled", f) && !strcasecmp(buf, "true")) *DomainDiscoveryDisabled = mDNStrue;
124 if (hostname && GetConfigOption(buf, "hostname", f) && !MakeDomainNameFromDNSNameString(hostname, buf)) goto badf;
125 if (domain && GetConfigOption(buf, "zone", f) && !MakeDomainNameFromDNSNameString(domain, buf)) goto badf;
126 buf[0] = 0;
127 GetConfigOption(buf, "secret-64", f); // failure means no authentication
128 fclose(f);
129 f = NULL;
130 }
131 else
132 {
133 if (errno != ENOENT) LogMsg("ERROR: Config file exists, but cannot be opened.");
134 return;
135 }
136
137 if (domain && domain->c[0] && buf[0])
138 {
139 DomainAuthInfo *info = (DomainAuthInfo*)mDNSPlatformMemAllocate(sizeof(*info));
140 // for now we assume keyname = service reg domain and we use same key for service and hostname registration
141 err = mDNS_SetSecretForDomain(m, info, domain, domain, buf, NULL, 0, NULL);
142 if (err) LogMsg("ERROR: mDNS_SetSecretForDomain returned %d for domain %##s", err, domain->c);
143 }
144
145 return;
146
147 badf:
148 LogMsg("ERROR: malformatted config file");
149 if (f) fclose(f);
150 }
151
152 #if MDNS_DEBUGMSGS
mDNSPlatformWriteDebugMsg(const char * msg)153 mDNSexport void mDNSPlatformWriteDebugMsg(const char *msg)
154 {
155 #ifdef __ANDROID__
156 __android_log_print(ANDROID_LOG_DEBUG, "mdns", "%s", msg);
157 #else
158 fprintf(stderr,"%s\n", msg);
159 fflush(stderr);
160 #endif
161 }
162 #endif
163
mDNSPlatformWriteLogMsg(const char * ident,const char * buffer,mDNSLogLevel_t loglevel)164 mDNSexport void mDNSPlatformWriteLogMsg(const char *ident, const char *buffer, mDNSLogLevel_t loglevel)
165 {
166 #if APPLE_OSX_mDNSResponder && LogTimeStamps
167 extern mDNS mDNSStorage;
168 extern mDNSu32 mDNSPlatformClockDivisor;
169 mDNSs32 t = mDNSStorage.timenow ? mDNSStorage.timenow : mDNSPlatformClockDivisor ? mDNS_TimeNow_NoLock(&mDNSStorage) : 0;
170 int ms = ((t < 0) ? -t : t) % 1000;
171 #endif
172
173 if (mDNS_DebugMode) // In debug mode we write to stderr
174 {
175 #if APPLE_OSX_mDNSResponder && LogTimeStamps
176 if (ident && ident[0] && mDNSPlatformClockDivisor)
177 fprintf(stderr,"%8d.%03d: %s\n", (int)(t/1000), ms, buffer);
178 else
179 #endif
180 fprintf(stderr,"%s\n", buffer);
181 fflush(stderr);
182 }
183 else // else, in production mode, we write to syslog
184 {
185 static int log_inited = 0;
186
187 int syslog_level = LOG_ERR;
188 switch (loglevel)
189 {
190 case MDNS_LOG_MSG: syslog_level = LOG_ERR; break;
191 case MDNS_LOG_OPERATION: syslog_level = LOG_WARNING; break;
192 case MDNS_LOG_SPS: syslog_level = LOG_NOTICE; break;
193 case MDNS_LOG_INFO: syslog_level = LOG_INFO; break;
194 case MDNS_LOG_DEBUG: syslog_level = LOG_DEBUG; break;
195 default:
196 fprintf(stderr, "Unknown loglevel %d, assuming LOG_ERR\n", loglevel);
197 fflush(stderr);
198 }
199
200 if (!log_inited) { openlog(ident, LOG_CONS, LOG_DAEMON); log_inited++; }
201
202 #if APPLE_OSX_mDNSResponder && LogTimeStamps
203 if (ident && ident[0] && mDNSPlatformClockDivisor)
204 syslog(syslog_level, "%8d.%03d: %s", (int)(t/1000), ms, buffer);
205 else
206 #endif
207 #ifdef __ANDROID__
208 switch (loglevel)
209 {
210 case MDNS_LOG_DEBUG: syslog_level = ANDROID_LOG_DEBUG; break;
211 #if MDNS_DEBUGMSGS > 0
212 case MDNS_LOG_OPERATION: syslog_level = ANDROID_LOG_WARN; break;
213 case MDNS_LOG_SPS: syslog_level = ANDROID_LOG_DEBUG; break;
214 case MDNS_LOG_INFO: syslog_level = ANDROID_LOG_INFO; break;
215 default: syslog_level = ANDROID_LOG_ERROR; break;
216 #else
217 default: return;
218 #endif
219 }
220 __android_log_print(syslog_level, "mdns", "%s", buffer);
221 #else
222 syslog(syslog_level, "%s", buffer);
223 #endif
224 }
225 }
226