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    Change History (most recent first):
18
19Log: PlatformCommon.c,v $
20Revision 1.21  2009/04/11 00:20:24  jessic2
21<rdar://problem/4426780> Daemon: Should be able to turn on LogOperation dynamically
22
23Revision 1.20  2008/10/09 22:26:05  cheshire
24Save space by not showing high-resolution timestamp in LogMsgNoIdent() lines
25
26Revision 1.19  2008/07/14 17:43:36  mkrochma
27Fix previous check in so connect still gets called
28
29Revision 1.18  2008/07/12 17:19:41  mkrochma
30<rdar://problem/6068351> mDNSResponder PlatformCommon.c uses sin_len even on non-compliant platforms
31
32Revision 1.17  2008/03/05 00:19:09  cheshire
33Conditionalize LogTimeStamps so it's specific to APPLE_OSX, for now
34
35Revision 1.16  2008/02/26 21:47:45  cheshire
36Added cast to avoid compiler warning
37
38Revision 1.15  2008/02/26 21:42:26  cheshire
39Added 'LogTimeStamps' option, to show ms-granularity timestamps on every log message
40
41Revision 1.14  2007/12/03 18:37:26  cheshire
42Moved mDNSPlatformWriteLogMsg & mDNSPlatformWriteDebugMsg
43from mDNSMacOSX.c to PlatformCommon.c, so that Posix build can use them
44
45Revision 1.13  2007/10/22 20:07:07  cheshire
46Moved mDNSPlatformSourceAddrForDest from mDNSMacOSX.c to PlatformCommon.c so
47Posix build can share the code (better than just pasting it into mDNSPosix.c)
48
49Revision 1.12  2007/10/16 17:19:53  cheshire
50<rdar://problem/3557903> Performance: Core code will not work on platforms with small stacks
51Cut ReadDDNSSettingsFromConfFile stack from 2112 to 1104 bytes
52
53Revision 1.11  2007/07/31 23:08:34  mcguire
54<rdar://problem/5329542> BTMM: Make AutoTunnel mode work with multihoming
55
56Revision 1.10  2007/07/11 02:59:58  cheshire
57<rdar://problem/5303807> Register IPv6-only hostname and don't create port mappings for AutoTunnel services
58Add AutoTunnel parameter to mDNS_SetSecretForDomain
59
60Revision 1.9  2007/01/09 22:37:44  cheshire
61Remove unused ClearDomainSecrets() function
62
63Revision 1.8  2006/12/22 20:59:51  cheshire
64<rdar://problem/4742742> Read *all* DNS keys from keychain,
65 not just key for the system-wide default registration domain
66
67Revision 1.7  2006/08/14 23:24:56  cheshire
68Re-licensed mDNSResponder daemon source code under Apache License, Version 2.0
69
70Revision 1.6  2005/04/08 21:30:16  ksekar
71<rdar://problem/4007457> Compiling problems with mDNSResponder-98 on Solaris/Sparc v9
72Patch submitted by Bernd Kuhls
73
74Revision 1.5  2005/02/01 19:33:30  ksekar
75<rdar://problem/3985239> Keychain format too restrictive
76
77Revision 1.4  2005/01/19 19:19:21  ksekar
78<rdar://problem/3960191> Need a way to turn off domain discovery
79
80Revision 1.3  2004/12/13 17:46:52  cheshire
81Use sizeof(buf) instead of fixed constant 1024
82
83Revision 1.2  2004/12/01 03:30:29  cheshire
84<rdar://problem/3889346> Add Unicast DNS support to mDNSPosix
85
86Revision 1.1  2004/12/01 01:51:35  cheshire
87Move ReadDDNSSettingsFromConfFile() from mDNSMacOSX.c to PlatformCommon.c
88
89 */
90
91#include <stdio.h>				// Needed for fopen() etc.
92#include <unistd.h>				// Needed for close()
93#include <string.h>				// Needed for strlen() etc.
94#include <errno.h>				// Needed for errno etc.
95#include <sys/socket.h>			// Needed for socket() etc.
96#include <netinet/in.h>			// Needed for sockaddr_in
97#include <syslog.h>
98
99#include "mDNSEmbeddedAPI.h"	// Defines the interface provided to the client layer above
100#include "DNSCommon.h"
101#include "PlatformCommon.h"
102
103#ifdef NOT_HAVE_SOCKLEN_T
104    typedef unsigned int socklen_t;
105#endif
106
107// Bind a UDP socket to find the source address to a destination
108mDNSexport void mDNSPlatformSourceAddrForDest(mDNSAddr *const src, const mDNSAddr *const dst)
109	{
110	union { struct sockaddr s; struct sockaddr_in a4; struct sockaddr_in6 a6; } addr;
111	socklen_t len = sizeof(addr);
112	socklen_t inner_len = 0;
113	int sock = socket(AF_INET, SOCK_DGRAM, 0);
114	src->type = mDNSAddrType_None;
115	if (sock == -1) return;
116	if (dst->type == mDNSAddrType_IPv4)
117		{
118		inner_len = sizeof(addr.a4);
119		#ifndef NOT_HAVE_SA_LEN
120		addr.a4.sin_len         = inner_len;
121		#endif
122		addr.a4.sin_family      = AF_INET;
123		addr.a4.sin_port        = 1;	// Not important, any port will do
124		addr.a4.sin_addr.s_addr = dst->ip.v4.NotAnInteger;
125		}
126	else if (dst->type == mDNSAddrType_IPv6)
127		{
128		inner_len = sizeof(addr.a6);
129		#ifndef NOT_HAVE_SA_LEN
130		addr.a6.sin6_len      = inner_len;
131		#endif
132		addr.a6.sin6_family   = AF_INET6;
133		addr.a6.sin6_flowinfo = 0;
134		addr.a6.sin6_port     = 1;	// Not important, any port will do
135		addr.a6.sin6_addr     = *(struct in6_addr*)&dst->ip.v6;
136		addr.a6.sin6_scope_id = 0;
137		}
138	else return;
139
140	if ((connect(sock, &addr.s, inner_len)) < 0)
141		{ LogMsg("mDNSPlatformSourceAddrForDest: connect %#a failed errno %d (%s)", dst, errno, strerror(errno)); goto exit; }
142
143	if ((getsockname(sock, &addr.s, &len)) < 0)
144		{ LogMsg("mDNSPlatformSourceAddrForDest: getsockname failed errno %d (%s)", errno, strerror(errno)); goto exit; }
145
146	src->type = dst->type;
147	if (dst->type == mDNSAddrType_IPv4) src->ip.v4.NotAnInteger = addr.a4.sin_addr.s_addr;
148	else                                src->ip.v6 = *(mDNSv6Addr*)&addr.a6.sin6_addr;
149exit:
150	close(sock);
151	}
152
153// dst must be at least MAX_ESCAPED_DOMAIN_NAME bytes, and option must be less than 32 bytes in length
154mDNSlocal mDNSBool GetConfigOption(char *dst, const char *option, FILE *f)
155	{
156	char buf[32+1+MAX_ESCAPED_DOMAIN_NAME];	// Option name, one space, option value
157	unsigned int len = strlen(option);
158	if (len + 1 + MAX_ESCAPED_DOMAIN_NAME > sizeof(buf)-1) { LogMsg("GetConfigOption: option %s too long", option); return mDNSfalse; }
159	fseek(f, 0, SEEK_SET);  // set position to beginning of stream
160	while (fgets(buf, sizeof(buf), f))		// Read at most sizeof(buf)-1 bytes from file, and append '\0' C-string terminator
161		{
162		if (!strncmp(buf, option, len))
163			{
164			strncpy(dst, buf + len + 1, MAX_ESCAPED_DOMAIN_NAME-1);
165			if (dst[MAX_ESCAPED_DOMAIN_NAME-1]) dst[MAX_ESCAPED_DOMAIN_NAME-1] = '\0';
166			len = strlen(dst);
167			if (len && dst[len-1] == '\n') dst[len-1] = '\0';  // chop newline
168			return mDNStrue;
169			}
170		}
171	debugf("Option %s not set", option);
172	return mDNSfalse;
173	}
174
175mDNSexport void ReadDDNSSettingsFromConfFile(mDNS *const m, const char *const filename, domainname *const hostname, domainname *const domain, mDNSBool *DomainDiscoveryDisabled)
176	{
177	char buf[MAX_ESCAPED_DOMAIN_NAME] = "";
178	mStatus err;
179	FILE *f = fopen(filename, "r");
180
181    if (hostname)                 hostname->c[0] = 0;
182    if (domain)                   domain->c[0] = 0;
183	if (DomainDiscoveryDisabled) *DomainDiscoveryDisabled = mDNSfalse;
184
185	if (f)
186		{
187		if (DomainDiscoveryDisabled && GetConfigOption(buf, "DomainDiscoveryDisabled", f) && !strcasecmp(buf, "true")) *DomainDiscoveryDisabled = mDNStrue;
188		if (hostname && GetConfigOption(buf, "hostname", f) && !MakeDomainNameFromDNSNameString(hostname, buf)) goto badf;
189		if (domain && GetConfigOption(buf, "zone", f) && !MakeDomainNameFromDNSNameString(domain, buf)) goto badf;
190		buf[0] = 0;
191		GetConfigOption(buf, "secret-64", f);  // failure means no authentication
192		fclose(f);
193		f = NULL;
194		}
195	else
196		{
197		if (errno != ENOENT) LogMsg("ERROR: Config file exists, but cannot be opened.");
198		return;
199		}
200
201	if (domain && domain->c[0] && buf[0])
202		{
203		DomainAuthInfo *info = (DomainAuthInfo*)mDNSPlatformMemAllocate(sizeof(*info));
204		// for now we assume keyname = service reg domain and we use same key for service and hostname registration
205		err = mDNS_SetSecretForDomain(m, info, domain, domain, buf, mDNSfalse);
206		if (err) LogMsg("ERROR: mDNS_SetSecretForDomain returned %d for domain %##s", err, domain->c);
207		}
208
209	return;
210
211	badf:
212	LogMsg("ERROR: malformatted config file");
213	if (f) fclose(f);
214	}
215
216#if MDNS_DEBUGMSGS
217mDNSexport void mDNSPlatformWriteDebugMsg(const char *msg)
218	{
219	fprintf(stderr,"%s\n", msg);
220	fflush(stderr);
221	}
222#endif
223
224mDNSexport void mDNSPlatformWriteLogMsg(const char *ident, const char *buffer, mDNSLogLevel_t loglevel)
225	{
226#if APPLE_OSX_mDNSResponder && LogTimeStamps
227	extern mDNS mDNSStorage;
228	extern mDNSu32 mDNSPlatformClockDivisor;
229	mDNSs32 t = mDNSStorage.timenow ? mDNSStorage.timenow : mDNSPlatformClockDivisor ? mDNS_TimeNow_NoLock(&mDNSStorage) : 0;
230	int ms = ((t < 0) ? -t : t) % 1000;
231#endif
232
233	if (mDNS_DebugMode)	// In debug mode we write to stderr
234		{
235#if APPLE_OSX_mDNSResponder && LogTimeStamps
236		if (ident && ident[0] && mDNSPlatformClockDivisor)
237			fprintf(stderr,"%8d.%03d: %s\n", (int)(t/1000), ms, buffer);
238		else
239#endif
240			fprintf(stderr,"%s\n", buffer);
241		fflush(stderr);
242		}
243	else				// else, in production mode, we write to syslog
244		{
245		static int log_inited = 0;
246
247		int syslog_level = LOG_ERR;
248		switch (loglevel)
249			{
250			case MDNS_LOG_MSG:       syslog_level = LOG_ERR;     break;
251			case MDNS_LOG_OPERATION: syslog_level = LOG_WARNING; break;
252			case MDNS_LOG_SPS:       syslog_level = LOG_NOTICE;  break;
253			case MDNS_LOG_INFO:      syslog_level = LOG_INFO;    break;
254			case MDNS_LOG_DEBUG:     syslog_level = LOG_DEBUG;   break;
255			default:
256			fprintf(stderr, "Unknown loglevel %d, assuming LOG_ERR\n", loglevel);
257			fflush(stderr);
258			}
259
260		if (!log_inited) { openlog(ident, LOG_CONS, LOG_DAEMON); log_inited++; }
261
262#if APPLE_OSX_mDNSResponder && LogTimeStamps
263		if (ident && ident[0] && mDNSPlatformClockDivisor)
264			syslog(syslog_level, "%8d.%03d: %s", (int)(t/1000), ms, buffer);
265		else
266#endif
267			syslog(syslog_level, "%s", buffer);
268		}
269	}
270