config.c 30.3 KB
Newer Older
1
/* Copyright 2001,2002,2003 Roger Dingledine, Matej Pfajfar. */
2
3
4
/* See LICENSE for licensing information */
/* $Id$ */

Nick Mathewson's avatar
Nick Mathewson committed
5
6
7
8
9
10
11
/**
 * /file config.c
 *
 * /brief Code to parse and interpret configuration files.
 *
 **/

Roger Dingledine's avatar
Roger Dingledine committed
12
#include "or.h"
Roger Dingledine's avatar
Roger Dingledine committed
13

Nick Mathewson's avatar
Nick Mathewson committed
14
15
16
17
18
19
20
21
/** Enumeration of types which option values can take */
typedef enum config_type_t {
  CONFIG_TYPE_STRING = 0, /**< An arbitrary string. */
  CONFIG_TYPE_INT, /**< An integer */
  CONFIG_TYPE_DOUBLE, /**< A floating-point value */
  CONFIG_TYPE_BOOL, /**< A boolean value, expressed as 0 or 1. */
  CONFIG_TYPE_LINELIST, /**< Uninterpreted config lines */
} config_type_t;
22

Nick Mathewson's avatar
Nick Mathewson committed
23
/** Largest allowed config line */
24
#define CONFIG_LINE_T_MAXLEN 4096
25
26
27

static FILE *config_open(const unsigned char *filename);
static int config_close(FILE *f);
28
29
30
static struct config_line_t *config_get_commandlines(int argc, char **argv);
static struct config_line_t *config_get_lines(FILE *f);
static void config_free_lines(struct config_line_t *front);
31
static int config_compare(struct config_line_t *c, const char *key, config_type_t type, void *arg);
32
static int config_assign(or_options_t *options, struct config_line_t *list);
33

Nick Mathewson's avatar
Nick Mathewson committed
34
/** Open a configuration file for reading */
35
static FILE *config_open(const unsigned char *filename) {
Roger Dingledine's avatar
Roger Dingledine committed
36
  tor_assert(filename);
37
38
39
40
41
42
43
  if (strspn(filename,CONFIG_LEGAL_FILENAME_CHARACTERS) != strlen(filename)) {
    /* filename has illegal letters */
    return NULL;
  }
  return fopen(filename, "r");
}

Nick Mathewson's avatar
Nick Mathewson committed
44
/** Close the configuration file */
45
static int config_close(FILE *f) {
Roger Dingledine's avatar
Roger Dingledine committed
46
  tor_assert(f);
47
48
49
  return fclose(f);
}

Nick Mathewson's avatar
Nick Mathewson committed
50
/** Helper: Read a list of configuration options from the command line. */
51
52
53
static struct config_line_t *config_get_commandlines(int argc, char **argv) {
  struct config_line_t *new;
  struct config_line_t *front = NULL;
54
55
56
  char *s;
  int i = 1;

Roger Dingledine's avatar
Roger Dingledine committed
57
  while(i < argc-1) {
58
59
60
61
62
63
    if(!strcmp(argv[i],"-f")) {
//      log(LOG_DEBUG,"Commandline: skipping over -f.");
      i+=2; /* this is the config file option. ignore it. */
      continue;
    }

64
    new = tor_malloc(sizeof(struct config_line_t));
65
66
67
    s = argv[i];
    while(*s == '-')
      s++;
68
69
    new->key = tor_strdup(s);
    new->value = tor_strdup(argv[i+1]);
70
71
72
73
74
75
76
77
78
79

    log(LOG_DEBUG,"Commandline: parsed keyword '%s', value '%s'",
      new->key, new->value);
    new->next = front;
    front = new;
    i += 2;
  }
  return front;
}

Nick Mathewson's avatar
Nick Mathewson committed
80
81
/** Helper: allocate a new configuration option mapping 'key' to 'val',
 * prepend it to 'front', and return the newly allocated config_line_t */
82
83
84
85
86
87
88
89
90
91
92
93
94
static struct config_line_t *
config_line_prepend(struct config_line_t *front,
                    const char *key,
                    const char *val)
{
  struct config_line_t *newline;
  newline = tor_malloc(sizeof(struct config_line_t));
  newline->key = tor_strdup(key);
  newline->value = tor_strdup(val);
  newline->next = front;
  return newline;
}

95
/** Helper: parse the config file and strdup into key/value
Nick Mathewson's avatar
Nick Mathewson committed
96
97
 * strings. Return list, or NULL if parsing the file failed.  Warn and
 * ignore any misformatted lines. */
98
99
100
101
static struct config_line_t *config_get_lines(FILE *f) {

  struct config_line_t *front = NULL;
  char line[CONFIG_LINE_T_MAXLEN];
102
103
  int result;
  char *key, *value;
104

105
  while( (result=parse_line_from_file(line,sizeof(line),f,&key,&value)) > 0) {
106
    front = config_line_prepend(front, key, value);
Roger Dingledine's avatar
Roger Dingledine committed
107
  }
108
109
  if(result < 0)
    return NULL;
110
  return front;
Roger Dingledine's avatar
Roger Dingledine committed
111
112
}

Nick Mathewson's avatar
Nick Mathewson committed
113
114
115
/**
 * Free all the configuration lines on the linked list <b>front</b>.
 */
116
117
static void config_free_lines(struct config_line_t *front) {
  struct config_line_t *tmp;
118
119
120
121
122
123
124
125
126
127
128

  while(front) {
    tmp = front;
    front = tmp->next;

    free(tmp->key);
    free(tmp->value);
    free(tmp);
  }
}

Nick Mathewson's avatar
Nick Mathewson committed
129
130
131
132
133
/** Search the linked list <b>c</b> for any option whose key is <b>key</b>.
 * If such an option is found, interpret it as of type <b>type</b>, and store
 * the result in <b>arg</b>.  If the option is misformatted, log a warning and
 * skip it.
 */
134
static int config_compare(struct config_line_t *c, const char *key, config_type_t type, void *arg) {
135
  int i;
136
137
138
139

  if(strncasecmp(c->key,key,strlen(c->key)))
    return 0;

140
141
142
143
144
  if(strcasecmp(c->key,key)) {
    tor_free(c->key);
    c->key = tor_strdup(key);
  }

145
  /* it's a match. cast and assign. */
146
  log_fn(LOG_DEBUG,"Recognized keyword '%s' as %s, using value '%s'.",c->key,key,c->value);
147
148

  switch(type) {
Roger Dingledine's avatar
Roger Dingledine committed
149
    case CONFIG_TYPE_INT:
150
      *(int *)arg = atoi(c->value);
151
      break;
152
153
154
    case CONFIG_TYPE_BOOL:
      i = atoi(c->value);
      if (i != 0 && i != 1) {
Roger Dingledine's avatar
Roger Dingledine committed
155
        log(LOG_WARN, "Boolean keyword '%s' expects 0 or 1", c->key);
156
        return 0;
157
158
159
      }
      *(int *)arg = i;
      break;
160
    case CONFIG_TYPE_STRING:
161
      tor_free(*(char **)arg);
162
      *(char **)arg = tor_strdup(c->value);
163
      break;
164
165
    case CONFIG_TYPE_DOUBLE:
      *(double *)arg = atof(c->value);
166
      break;
167
168
169
170
171
172
173
    case CONFIG_TYPE_LINELIST:
      /* Note: this reverses the order that the lines appear in.  That's
       * just fine, since we build up the list of lines reversed in the
       * first place. */
      *(struct config_line_t**)arg =
        config_line_prepend(*(struct config_line_t**)arg, c->key, c->value);
      break;
174
175
176
177
  }
  return 1;
}

Nick Mathewson's avatar
Nick Mathewson committed
178
179
/** Iterate through the linked list of options <b>list</b>.
 * For each item, convert as appropriate and assign to <b>options</b>.
180
181
 * If an item is unrecognized, return -1 immediately,
 * else return 0 for success. */
182
static int config_assign(or_options_t *options, struct config_line_t *list) {
183
184
185
186
187
188
189

  while(list) {
    if(

    /* order matters here! abbreviated arguments use the first match. */

    /* string options */
190
    config_compare(list, "Address",        CONFIG_TYPE_STRING, &options->Address) ||
191
    config_compare(list, "AuthoritativeDirectory",CONFIG_TYPE_BOOL, &options->AuthoritativeDir) ||
192

193
194
195
    config_compare(list, "BandwidthRate",  CONFIG_TYPE_INT, &options->BandwidthRate) ||
    config_compare(list, "BandwidthBurst", CONFIG_TYPE_INT, &options->BandwidthBurst) ||

196
    config_compare(list, "ClientOnly",     CONFIG_TYPE_BOOL, &options->ClientOnly) ||
197
    config_compare(list, "ContactInfo",    CONFIG_TYPE_STRING, &options->ContactInfo) ||
198

199
    config_compare(list, "DebugLogFile",   CONFIG_TYPE_STRING, &options->DebugLogFile) ||
200
    config_compare(list, "DataDirectory",  CONFIG_TYPE_STRING, &options->DataDirectory) ||
201
    config_compare(list, "DirPort",        CONFIG_TYPE_INT, &options->DirPort) ||
202
    config_compare(list, "DirBindAddress", CONFIG_TYPE_LINELIST, &options->DirBindAddress) ||
203
204
    config_compare(list, "DirFetchPostPeriod",CONFIG_TYPE_INT, &options->DirFetchPostPeriod) ||

205
206
    config_compare(list, "ExitNodes",      CONFIG_TYPE_STRING, &options->ExitNodes) ||
    config_compare(list, "EntryNodes",     CONFIG_TYPE_STRING, &options->EntryNodes) ||
207
    config_compare(list, "ExitPolicy",     CONFIG_TYPE_LINELIST, &options->ExitPolicy) ||
208
    config_compare(list, "ExcludeNodes",   CONFIG_TYPE_STRING, &options->ExcludeNodes) ||
209

210
    config_compare(list, "Group",          CONFIG_TYPE_STRING, &options->Group) ||
211

212
213
214
215
    config_compare(list, "IgnoreVersion",  CONFIG_TYPE_BOOL, &options->IgnoreVersion) ||

    config_compare(list, "KeepalivePeriod",CONFIG_TYPE_INT, &options->KeepalivePeriod) ||

216
217
    config_compare(list, "LogLevel",       CONFIG_TYPE_LINELIST, &options->LogOptions) ||
    config_compare(list, "LogFile",        CONFIG_TYPE_LINELIST, &options->LogOptions) ||
218
219
220
    config_compare(list, "LinkPadding",    CONFIG_TYPE_BOOL, &options->LinkPadding) ||

    config_compare(list, "MaxConn",        CONFIG_TYPE_INT, &options->MaxConn) ||
221
    config_compare(list, "MaxOnionsPending",CONFIG_TYPE_INT, &options->MaxOnionsPending) ||
222
223

    config_compare(list, "Nickname",       CONFIG_TYPE_STRING, &options->Nickname) ||
224
    config_compare(list, "NewCircuitPeriod",CONFIG_TYPE_INT, &options->NewCircuitPeriod) ||
225
    config_compare(list, "NumCpus",        CONFIG_TYPE_INT, &options->NumCpus) ||
226

227
    config_compare(list, "ORPort",         CONFIG_TYPE_INT, &options->ORPort) ||
228
    config_compare(list, "ORBindAddress",  CONFIG_TYPE_LINELIST, &options->ORBindAddress) ||
229

230
    config_compare(list, "PidFile",        CONFIG_TYPE_STRING, &options->PidFile) ||
231
    config_compare(list, "PathlenCoinWeight",CONFIG_TYPE_DOUBLE, &options->PathlenCoinWeight) ||
232
233
234

    config_compare(list, "RouterFile",     CONFIG_TYPE_STRING, &options->RouterFile) ||
    config_compare(list, "RunAsDaemon",    CONFIG_TYPE_BOOL, &options->RunAsDaemon) ||
235
    config_compare(list, "RecommendedVersions",CONFIG_TYPE_STRING, &options->RecommendedVersions) ||
236
237
    config_compare(list, "RendNodes",      CONFIG_TYPE_STRING, &options->RendNodes) ||
    config_compare(list, "RendExcludeNodes",CONFIG_TYPE_STRING, &options->RendExcludeNodes) ||
238

239
    config_compare(list, "SocksPort",      CONFIG_TYPE_INT, &options->SocksPort) ||
240
241
    config_compare(list, "SocksBindAddress",CONFIG_TYPE_LINELIST,&options->SocksBindAddress) ||
    config_compare(list, "SocksPolicy",     CONFIG_TYPE_LINELIST,&options->SocksPolicy) ||
242
243
244

    config_compare(list, "TrafficShaping", CONFIG_TYPE_BOOL, &options->TrafficShaping) ||

245
    config_compare(list, "User",           CONFIG_TYPE_STRING, &options->User) ||
246
    config_compare(list, "RunTesting",     CONFIG_TYPE_BOOL, &options->RunTesting) ||
247
248
249
250
    config_compare(list, "HiddenServiceDir", CONFIG_TYPE_LINELIST, &options->RendConfigLines)||
    config_compare(list, "HiddenServicePort", CONFIG_TYPE_LINELIST, &options->RendConfigLines)||
    config_compare(list, "HiddenServiceNodes", CONFIG_TYPE_LINELIST, &options->RendConfigLines)||
    config_compare(list, "HiddenServiceExcludeNodes", CONFIG_TYPE_LINELIST, &options->RendConfigLines)
251
252
253
    ) {
      /* then we're ok. it matched something. */
    } else {
254
255
      log_fn(LOG_WARN,"Unknown keyword '%s'. Failing.",list->key);
      return -1;
256
257
258
    }

    list = list->next;
Roger Dingledine's avatar
Roger Dingledine committed
259
  }
260
  return 0;
261
262
}

263
const char default_dirservers_string[] =
264
265
266
267
"router moria1 18.244.0.188 9001 9021 9031\n"
"platform Tor 0.0.6rc1 on Linux moria.mit.edu i686\n"
"published 2004-04-25 21:54:28\n"
"bandwidth 800000 10000000\n"
268
269
270
271
272
273
274
275
276
277
278
279
"onion-key\n"
"-----BEGIN RSA PUBLIC KEY-----\n"
"MIGJAoGBANoIvHieyHUTzIacbnWOnyTyzGrLOdXqbcjz2GGMxyHEd5K1bO1ZBNHP\n"
"9i5qLQpN5viFk2K2rEGuG8tFgDEzSWZEtBqv3NVfUdiumdERWMBwlaQ0MVK4C+jf\n"
"y5gZ8KI3o9ZictgPS1AQF+Kk932/vIHTuRIUKb4ILTnQilNvID0NAgMBAAE=\n"
"-----END RSA PUBLIC KEY-----\n"
"signing-key\n"
"-----BEGIN RSA PUBLIC KEY-----\n"
"MIGJAoGBAMHa0ZC/jo2Q2DrwKYF/6ZbmZ27PFYG91u4gUzzmZ/VXLpZ8wNzEV3oW\n"
"nt+I61048fBiC1frT1/DZ351n2bLSk9zJbB6jyGZJn0380FPRX3+cXyXS0Gq8Ril\n"
"xkhMQf5XuNFUb8UmYPSOH4WErjvYjKvU+gfjbK/82Jo9SuHpYz+BAgMBAAE=\n"
"-----END RSA PUBLIC KEY-----\n"
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
"reject 0.0.0.0/255.0.0.0:*\n"
"reject 169.254.0.0/255.255.0.0:*\n"
"reject 127.0.0.0/255.0.0.0:*\n"
"reject 192.168.0.0/255.255.0.0:*\n"
"reject 10.0.0.0/255.0.0.0:*\n"
"reject 172.16.0.0/255.240.0.0:*\n"
"accept *:20-22\n"
"accept *:53\n"
"accept *:79-80\n"
"accept *:110\n"
"accept *:143\n"
"accept *:443\n"
"accept *:873\n"
"accept *:993\n"
"accept *:995\n"
"accept *:1024-65535\n"
"reject *:*\n"
297
298
"router-signature\n"
"-----BEGIN SIGNATURE-----\n"
299
300
301
"o1eAoRHDAEAXsnh5wN++vIwrupd+DbAJ2p3wxHDrmqxTpygzxxCnyQyhMfX03ua2\n"
"4iplyNlwyFwzWcw0sk31otlO2HBYXT1V9G0YxGtKMOeOBMHjfGbUjGvEALHzWi4z\n"
"8DXGJp13zgnUyP4ZA6xaGROwcT6oB5e7UlztvvpGxTg=\n"
302
303
"-----END SIGNATURE-----\n"
"\n"
304
305
306
307
"router moria2 18.244.0.188 9002 9022 9032\n"
"platform Tor 0.0.6rc1 on Linux moria.mit.edu i686\n"
"published 2004-04-25 21:54:30\n"
"bandwidth 800000 10000000\n"
308
309
310
311
312
313
314
315
316
317
318
319
"onion-key\n"
"-----BEGIN RSA PUBLIC KEY-----\n"
"MIGJAoGBAM4Cc/npgYC54XrYLC+grVxJp7PDmNO2DRRJOxKttBBtvLpnR1UaueTi\n"
"kyknT5kmlx+ihgZF/jmye//2dDUp2+kK/kSkpRV4xnDLXZmed+sNSQxqmm9TtZQ9\n"
"/hjpxhp5J9HmUTYhntBs+4E4CUKokmrI6oRLoln4SA39AX9QLPcnAgMBAAE=\n"
"-----END RSA PUBLIC KEY-----\n"
"signing-key\n"
"-----BEGIN RSA PUBLIC KEY-----\n"
"MIGJAoGBAOcrht/y5rkaahfX7sMe2qnpqoPibsjTSJaDvsUtaNP/Bq0MgNDGOR48\n"
"rtwfqTRff275Edkp/UYw3G3vSgKCJr76/bqOHCmkiZrnPV1zxNfrK18gNw2Cxre0\n"
"nTA+fD8JQqpPtb8b0SnG9kwy75eS//sRu7TErie2PzGMxrf9LH0LAgMBAAE=\n"
"-----END RSA PUBLIC KEY-----\n"
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
"reject 0.0.0.0/255.0.0.0:*\n"
"reject 169.254.0.0/255.255.0.0:*\n"
"reject 127.0.0.0/255.0.0.0:*\n"
"reject 192.168.0.0/255.255.0.0:*\n"
"reject 10.0.0.0/255.0.0.0:*\n"
"reject 172.16.0.0/255.240.0.0:*\n"
"accept *:20-22\n"
"accept *:53\n"
"accept *:79-80\n"
"accept *:110\n"
"accept *:143\n"
"accept *:443\n"
"accept *:873\n"
"accept *:993\n"
"accept *:995\n"
"accept *:1024-65535\n"
"reject *:*\n"
337
338
"router-signature\n"
"-----BEGIN SIGNATURE-----\n"
339
340
341
"RKROLwP1ExjTZeg6wuN0pzYqed9IJUd5lAe9hp4ritbnmJAgS6qfww6jgx61CfUR\n"
"6SElhOLE7Q77jAdoL45Ji5pn/Y+Q+E+5lJm1E/ed9ha+YsOPaOc7z6GQ7E4mihCL\n"
"gI1vsw92+P1Ty4RHj6fyD9DhbV19nh2Qs+pvGJOS2FY=\n"
342
343
"-----END SIGNATURE-----\n"
"\n"
344
345
346
347
"router tor26 62.116.124.106 9001 9050 9030\n"
"platform Tor 0.0.6 on Linux seppia i686\n"
"published 2004-05-06 21:33:23\n"
"bandwidth 500000 10000000\n"
348
349
"onion-key\n"
"-----BEGIN RSA PUBLIC KEY-----\n"
350
351
352
"MIGJAoGBAMEHdDnpj3ik1AF1xe/VqjoguH2DbANifYqXXfempu0fS+tU9FGo6dU/\n"
"fnVHAZwL9Ek9k2rMzumShi1RduK9p035R/Gk+PBBcLfvwYJ/Nat+ZO/L8jn/3bZe\n"
"ieQd9CKj2LjNGKpRNry37vkwMGIOIlegwK+2us8aXJ7sIvlNts0TAgMBAAE=\n"
353
354
355
"-----END RSA PUBLIC KEY-----\n"
"signing-key\n"
"-----BEGIN RSA PUBLIC KEY-----\n"
356
357
358
"MIGJAoGBAMQgV2gXLbXgesWgeAsj8P1Uvm/zibrFXqwDq27lLKNgWGYGX2ax3LyT\n"
"3nzI1Y5oLs4kPKTsMM5ft9aokwf417lKoCRlZc9ptfRbgxDx90c9GtWVmkrmDvCK\n"
"ae59TMoXIiGfZiwWT6KKq5Zm9/Fu2Il3B2vHGkKJYKixmiBJRKp/AgMBAAE=\n"
359
"-----END RSA PUBLIC KEY-----\n"
360
361
362
"accept 62.245.184.24:25\n"
"accept 62.116.124.106:6666-6670\n"
"accept *:48099\n"
363
"reject *:*\n"
364
365
"router-signature\n"
"-----BEGIN SIGNATURE-----\n"
366
367
368
"qh/xRoqfLNFzPaB8VdpbdMAwRyuk5qjx4LeLVQ2pDwTZ55PqmG99+VKUNte2WTTD\n"
"7dZEA7um2rueohGe4nYmvbhJWr20/I0ZxmWDRDvFy0b5nwzDMGvLvDw95Zu/XJQ2\n"
"md32NE3y9VZCfbCN+GlvETX3fdR3Svzcm8Kzesg2/s4=\n"
369
370
371
"-----END SIGNATURE-----\n"
;

372
int config_assign_default_dirservers(void) {
373
  if(router_load_routerlist_from_string(default_dirservers_string, 1) < 0) {
374
375
376
377
378
379
    log_fn(LOG_WARN,"Bug: the default dirservers internal string is corrupt.");
    return -1;
  }
  return 0;
}

Nick Mathewson's avatar
Nick Mathewson committed
380
381
/** Set <b>options</b> to a reasonable default.
 *
Roger Dingledine's avatar
Roger Dingledine committed
382
 * Call this function when we can't find any torrc config file.
383
 */
Roger Dingledine's avatar
Roger Dingledine committed
384
static int config_assign_defaults(or_options_t *options) {
385
386
387
388

  /* set them up as a client only */
  options->SocksPort = 9050;

Roger Dingledine's avatar
Roger Dingledine committed
389
390
391
  config_free_lines(options->ExitPolicy);
  options->ExitPolicy = config_line_prepend(NULL, "ExitPolicy", "reject *:*");

392
  /* plus give them a dirservers file */
393
  if(config_assign_default_dirservers() < 0)
394
395
396
397
    return -1;
  return 0;
}

Nick Mathewson's avatar
Nick Mathewson committed
398
/** Print a usage message for tor. */
399
static void print_usage(void) {
400
  printf("tor -f <torrc> [args]\n"
401
         "See man page for more options. This -h is probably obsolete.\n\n"
402
         "-b <bandwidth>\t\tbytes/second rate limiting\n"
403
         "-d <file>\t\tDebug file\n"
404
//         "-m <max>\t\tMax number of connections\n"
405
406
407
408
         "-l <level>\t\tLog level\n"
         "-r <file>\t\tList of known routers\n");
  printf("\nClient options:\n"
         "-e \"nick1 nick2 ...\"\t\tExit nodes\n"
409
         "-s <IP>\t\t\tPort to bind to for Socks\n"
410
         );
411
412
  printf("\nServer options:\n"
         "-n <nick>\t\tNickname of router\n"
413
414
415
         "-o <port>\t\tOR port to bind to\n"
         "-p <file>\t\tPID file\n"
         );
416
417
}

Nick Mathewson's avatar
Nick Mathewson committed
418
419
420
/**
 * Adjust <b>options</b> to contain a reasonable value for Address.
 */
421
static int resolve_my_address(or_options_t *options) {
422
423
424
  struct in_addr in;
  struct hostent *rent;
  char localhostname[256];
425
  int explicit_ip=1;
426
427

  if(!options->Address) { /* then we need to guess our address */
428
    explicit_ip = 0; /* it's implicit */
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446

    if(gethostname(localhostname,sizeof(localhostname)) < 0) {
      log_fn(LOG_WARN,"Error obtaining local hostname");
      return -1;
    }
#if 0 /* don't worry about complaining, as long as it resolves */
    if(!strchr(localhostname,'.')) {
      log_fn(LOG_WARN,"fqdn '%s' has only one element. Misconfigured machine?",address);
      log_fn(LOG_WARN,"Try setting the Address line in your config file.");
      return -1;
    }
#endif
    options->Address = tor_strdup(localhostname);
    log_fn(LOG_DEBUG,"Guessed local host name as '%s'",options->Address);
  }

  /* now we know options->Address is set. resolve it and keep only the IP */

447
448
449
450
451
452
453
454
  if(tor_inet_aton(options->Address, &in) == 0) {
    /* then we have to resolve it */
    explicit_ip = 0;
    rent = (struct hostent *)gethostbyname(options->Address);
    if (!rent) {
      log_fn(LOG_WARN,"Could not resolve Address %s. Failing.", options->Address);
      return -1;
    }
Roger Dingledine's avatar
Roger Dingledine committed
455
    tor_assert(rent->h_length == 4);
456
    memcpy(&in.s_addr, rent->h_addr,rent->h_length);
457
  }
458
  if(!explicit_ip && is_internal_IP(htonl(in.s_addr))) {
459
    log_fn(LOG_WARN,"Address '%s' resolves to private IP '%s'. "
460
           "Please set the Address config option to be the IP you want to use.",
461
462
463
464
465
466
467
468
469
           options->Address, inet_ntoa(in));
    return -1;
  }
  tor_free(options->Address);
  options->Address = tor_strdup(inet_ntoa(in));
  log_fn(LOG_DEBUG,"Resolved Address to %s.", options->Address);
  return 0;
}

470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
static char *get_default_nickname(void)
{
  char localhostname[256];
  char *cp, *out, *outp;

  if(gethostname(localhostname,sizeof(localhostname)) < 0) {
    log_fn(LOG_WARN,"Error obtaining local hostname");
    return NULL;
  }
  /* Put it in lowercase; stop at the first dot. */
  for(cp = localhostname; *cp; ++cp) {
    if (*cp == '.') {
      *cp = '\0';
      break;
    }
    *cp = tolower(*cp);
  }
  /* Strip invalid characters. */
  cp = localhostname;
  out = outp = tor_malloc(strlen(localhostname)+1);
  while (*cp) {
    if (strchr(LEGAL_NICKNAME_CHARACTERS, *cp))
      *outp++ = *cp++;
    else
      cp++;
  }
  *outp = '\0';
  /* Enforce length. */
  if (strlen(out) > MAX_NICKNAME_LEN)
    out[MAX_NICKNAME_LEN]='\0';

  return out;
}

Nick Mathewson's avatar
Nick Mathewson committed
504
/** Release storage held by <b>options</b> */
505
static void free_options(or_options_t *options) {
506
  config_free_lines(options->LogOptions);
507
  tor_free(options->ContactInfo);
508
509
510
511
512
513
  tor_free(options->DebugLogFile);
  tor_free(options->DataDirectory);
  tor_free(options->RouterFile);
  tor_free(options->Nickname);
  tor_free(options->Address);
  tor_free(options->PidFile);
514
515
  tor_free(options->ExitNodes);
  tor_free(options->EntryNodes);
516
  tor_free(options->ExcludeNodes);
517
518
  tor_free(options->RendNodes);
  tor_free(options->RendExcludeNodes);
519
  tor_free(options->RecommendedVersions);
520
521
  tor_free(options->User);
  tor_free(options->Group);
522
  config_free_lines(options->RendConfigLines);
523
524
525
526
527
  config_free_lines(options->SocksBindAddress);
  config_free_lines(options->ORBindAddress);
  config_free_lines(options->DirBindAddress);
  config_free_lines(options->ExitPolicy);
  config_free_lines(options->SocksPolicy);
528
}
529

Nick Mathewson's avatar
Nick Mathewson committed
530
/** Set <b>options</b> to hold reasonable defaults for most options. */
531
static void init_options(or_options_t *options) {
532
/* give reasonable values for each option. Defaults to zero. */
533
  memset(options,0,sizeof(or_options_t));
534
  options->LogOptions = NULL;
535
536
  options->ExitNodes = tor_strdup("");
  options->EntryNodes = tor_strdup("");
537
  options->ExcludeNodes = tor_strdup("");
538
539
  options->RendNodes = tor_strdup("");
  options->RendExcludeNodes = tor_strdup("");
540
541
542
543
544
  options->ExitPolicy = NULL;
  options->SocksPolicy = NULL;
  options->SocksBindAddress = NULL;
  options->ORBindAddress = NULL;
  options->DirBindAddress = NULL;
545
  options->RecommendedVersions = NULL;
546
  options->PidFile = NULL; // tor_strdup("tor.pid");
547
  options->DataDirectory = NULL;
548
  options->PathlenCoinWeight = 0.3;
549
  options->MaxConn = 900;
550
  options->DirFetchPostPeriod = 600;
551
  options->KeepalivePeriod = 300;
552
  options->MaxOnionsPending = 100;
553
  options->NewCircuitPeriod = 30; /* twice a minute */
554
555
  options->BandwidthRate = 800000; /* at most 800kB/s total sustained incoming */
  options->BandwidthBurst = 10000000; /* max burst on the token bucket */
556
  options->NumCpus = 1;
557
  options->RendConfigLines = NULL;
558
559
}

Nick Mathewson's avatar
Nick Mathewson committed
560
561
562
/** Read a configuration file into <b>options</b>, finding the configuration
 * file location based on the command line.  After loading the options,
 * validate them for consistency. Return 0 if success, <0 if failure. */
563
int getconfig(int argc, char **argv, or_options_t *options) {
564
  struct config_line_t *cl;
565
566
567
568
  FILE *cf;
  char *fname;
  int i;
  int result = 0;
569
570
571
572
573
  static int first_load = 1;
  static char **backup_argv;
  static int backup_argc;
  char *previous_pidfile = NULL;
  int previous_runasdaemon = 0;
574
  int previous_orport = -1;
575
  int using_default_torrc;
576
577
578
579
580
581
582
583
584
585

  if(first_load) { /* first time we're called. save commandline args */
    backup_argv = argv;
    backup_argc = argc;
    first_load = 0;
  } else { /* we're reloading. need to clean up old ones first. */
    argv = backup_argv;
    argc = backup_argc;

    /* record some previous values, so we can fail if they change */
586
587
    if(options->PidFile)
      previous_pidfile = tor_strdup(options->PidFile);
588
    previous_runasdaemon = options->RunAsDaemon;
589
    previous_orport = options->ORPort;
590
591
    free_options(options);
  }
Roger Dingledine's avatar
Roger Dingledine committed
592
  init_options(options);
593

594
595
596
597
598
  if(argc > 1 && (!strcmp(argv[1], "-h") || !strcmp(argv[1],"--help"))) {
    print_usage();
    exit(0);
  }

599
600
601
602
603
  if(argc > 1 && (!strcmp(argv[1],"--version"))) {
    printf("Tor version %s.\n",VERSION);
    exit(0);
  }

604
605
606
607
608
609
/* learn config file name, get config lines, assign them */
  i = 1;
  while(i < argc-1 && strcmp(argv[i],"-f")) {
    i++;
  }
  if(i < argc-1) { /* we found one */
610
    fname = argv[i+1];
611
    using_default_torrc = 0;
612
613
  } else { /* didn't find one, try CONFDIR */
    fname = CONFDIR "/torrc";
614
    using_default_torrc = 1;
615
616
617
618
  }
  log(LOG_DEBUG,"Opening config file '%s'",fname);

  cf = config_open(fname);
619
  if(!cf) {
620
    if(using_default_torrc == 1) {
621
      log(LOG_NOTICE, "Configuration file '%s' not present, using reasonable defaults.",fname);
Roger Dingledine's avatar
Roger Dingledine committed
622
      if(config_assign_defaults(options) < 0)
623
624
625
626
627
628
629
630
        return -1;
    } else {
      log(LOG_WARN, "Unable to open configuration file '%s'.",fname);
      return -1;
    }
  } else { /* it opened successfully. use it. */
    cl = config_get_lines(cf);
    if(!cl) return -1;
631
632
    if(config_assign(options,cl) < 0)
      return -1;
633
634
    config_free_lines(cl);
    config_close(cf);
635
  }
636

637
638
/* go through command-line variables too */
  cl = config_get_commandlines(argc,argv);
639
640
  if(config_assign(options,cl) < 0)
    return -1;
641
642
643
644
  config_free_lines(cl);

/* Validate options */

645
  /* first check if any of the previous options have changed but aren't allowed to */
646
647
648
649
650
651
652
653
654
655
656
657
  if(previous_pidfile && strcmp(previous_pidfile,options->PidFile)) {
    log_fn(LOG_WARN,"During reload, PidFile changed from %s to %s. Failing.",
           previous_pidfile, options->PidFile);
    return -1;
  }
  tor_free(previous_pidfile);

  if(previous_runasdaemon && !options->RunAsDaemon) {
    log_fn(LOG_WARN,"During reload, change from RunAsDaemon=1 to =0 not allowed. Failing.");
    return -1;
  }

658
  if(previous_orport == 0 && options->ORPort > 0) {
Roger Dingledine's avatar
Roger Dingledine committed
659
    log_fn(LOG_WARN,"During reload, change from ORPort=0 to >0 not allowed. Failing.");
660
661
662
    return -1;
  }

663
  if(options->ORPort < 0) {
Roger Dingledine's avatar
Roger Dingledine committed
664
    log(LOG_WARN,"ORPort option can't be negative.");
665
666
667
    result = -1;
  }

668
669
  if (options->ORPort) {
    if (options->Nickname == NULL) {
670
671
672
      if (!(options->Nickname = get_default_nickname()))
        return -1;
      log_fn(LOG_INFO, "Choosing default nickname %s", options->Nickname);
673
674
675
676
677
678
679
680
681
682
683
    } else {
      if (strspn(options->Nickname, LEGAL_NICKNAME_CHARACTERS) !=
                 strlen(options->Nickname)) {
        log_fn(LOG_WARN, "Nickname '%s' contains illegal characters.", options->Nickname);
        result = -1;
      }
      if (strlen(options->Nickname) > MAX_NICKNAME_LEN) {
        log_fn(LOG_WARN, "Nickname '%s' has more than %d characters.",
               options->Nickname, MAX_NICKNAME_LEN);
        result = -1;
      }
684
    }
685
686
  }

687
  if(options->ORPort) { /* get an IP for ourselves */
688
689
    if(resolve_my_address(options) < 0)
      result = -1;
690
691
  }

692
693
  if(options->SocksPort < 0) {
    log(LOG_WARN,"SocksPort option can't be negative.");
694
695
696
    result = -1;
  }

697
698
699
  if(options->SocksPort == 0 && options->ORPort == 0) {
    log(LOG_WARN,"SocksPort and ORPort are both undefined? Quitting.");
    result = -1;
Roger Dingledine's avatar
Roger Dingledine committed
700
  }
701

702
  if(options->DirPort < 0) {
Roger Dingledine's avatar
Roger Dingledine committed
703
    log(LOG_WARN,"DirPort option can't be negative.");
704
705
706
    result = -1;
  }

Roger Dingledine's avatar
Roger Dingledine committed
707
  if(options->AuthoritativeDir && options->RecommendedVersions == NULL) {
708
709
710
711
    log(LOG_WARN,"Directory servers must configure RecommendedVersions.");
    result = -1;
  }

712
713
714
715
716
  if(options->AuthoritativeDir && !options->DirPort) {
    log(LOG_WARN,"Running as authoritative directory, but no DirPort set.");
    result = -1;
  }

717
718
719
720
  /* XXX008 if AuthDir and !ORPort then fail */

  /* XXX008 if AuthDir and ClientOnly then fail */

721
  if(options->SocksPort > 1 &&
722
723
     (options->PathlenCoinWeight < 0.0 || options->PathlenCoinWeight >= 1.0)) {
    log(LOG_WARN,"PathlenCoinWeight option must be >=0.0 and <1.0.");
724
725
726
    result = -1;
  }

727
  if(options->MaxConn < 1) {
Roger Dingledine's avatar
Roger Dingledine committed
728
    log(LOG_WARN,"MaxConn option must be a non-zero positive integer.");
729
730
731
732
    result = -1;
  }

  if(options->MaxConn >= MAXCONNECTIONS) {
Roger Dingledine's avatar
Roger Dingledine committed
733
    log(LOG_WARN,"MaxConn option must be less than %d.", MAXCONNECTIONS);
734
735
736
    result = -1;
  }

737
  if(options->DirFetchPostPeriod < 1) {
Roger Dingledine's avatar
Roger Dingledine committed
738
    log(LOG_WARN,"DirFetchPostPeriod option must be positive.");
739
740
    result = -1;
  }
741
742
743
744
  if(options->DirFetchPostPeriod > MIN_ONION_KEY_LIFETIME/2) {
    log(LOG_WARN,"DirFetchPostPeriod is too large; clipping.");
    options->DirFetchPostPeriod = MIN_ONION_KEY_LIFETIME/2;
  }
745
746

  if(options->KeepalivePeriod < 1) {
Roger Dingledine's avatar
Roger Dingledine committed
747
    log(LOG_WARN,"KeepalivePeriod option must be positive.");
748
749
750
    result = -1;
  }

751
752
753
754
  /* XXX look at the various nicknamelists and make sure they're
   * valid and don't have hostnames that are too long.
   */

755
756
757
758
  if (rend_config_services(options) < 0) {
    result = -1;
  }

759
  return result;
760
761
}

762
static int add_single_log(struct config_line_t *level_opt,
763
764
765
766
767
768
769
770
771
772
773
774
                           struct config_line_t *file_opt,
                           int isDaemon)
{
  int levelMin=-1, levelMax=-1;
  char *cp, *tmp_sev;

  if (level_opt) {
    cp = strchr(level_opt->value, '-');
    if (cp) {
      tmp_sev = tor_strndup(level_opt->value, cp - level_opt->value);
      levelMin = parse_log_level(tmp_sev);
      if (levelMin<0) {
775
776
        log_fn(LOG_WARN, "Unrecognized log severity '%s': must be one of err|warn|notice|info|debug", tmp_sev);
        return -1;
777
778
779
780
      }
      tor_free(tmp_sev);
      levelMax = parse_log_level(cp+1);
      if (levelMax<0) {
781
782
        log_fn(LOG_WARN, "Unrecognized log severity '%s': must be one of err|warn|notice|info|debug", cp+1);
        return -1;
783
784
785
786
      }
    } else {
      levelMin = parse_log_level(level_opt->value);
      if (levelMin<0) {
787
788
789
        log_fn(LOG_WARN, "Unrecognized log severity '%s': must be one of err|warn|notice|info|debug", level_opt->value);
        return -1;

790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
      }
    }
  }
  if (levelMin < 0 && levelMax < 0) {
    levelMin = LOG_NOTICE;
    levelMax = LOG_ERR;
  } else if (levelMin < 0) {
    levelMin = levelMax;
  } else {
    levelMax = LOG_ERR;
  }
  if (file_opt) {
    if (add_file_log(levelMin, levelMax, file_opt->value) < 0) {
      log_fn(LOG_WARN, "Cannot write to LogFile '%s': %s.", file_opt->value,
             strerror(errno));
805
      return -1;
806
807
808
809
    }
    log_fn(LOG_NOTICE, "Successfully opened LogFile '%s', redirecting output.",
           file_opt->value);
  } else if (!isDaemon) {
810
    add_stream_log(levelMin, levelMax, "<stdout>", stdout);
811
    close_temp_logs();
812
  }
813
  return 0;
814
815
816
817
818
}

/**
 * Initialize the logs based on the configuration file.
 */
819
int config_init_logs(or_options_t *options)
820
821
822
823
824
{
  /* The order of options is:  Level? (File Level?)+
   */
  struct config_line_t *opt = options->LogOptions;

825
826
827
828
  /* Special case if no options are given. */
  if (!opt) {
    add_stream_log(LOG_NOTICE, LOG_ERR, "<stdout>", stdout);
    close_temp_logs();
Roger Dingledine's avatar
Roger Dingledine committed
829
830
    /* don't return yet, in case we want to do a debuglogfile below */
  }
831

832
833
834
  /* Special case for if first option is LogLevel. */
  if (opt && !strcasecmp(opt->key, "LogLevel")) {
    if (opt->next && !strcasecmp(opt->next->key, "LogFile")) {
835
836
      if (add_single_log(opt, opt->next, options->RunAsDaemon)<0)
        return -1;
837
838
      opt = opt->next->next;
    } else if (!opt->next) {
839
840
      if (add_single_log(opt, NULL, options->RunAsDaemon)<0)
        return -1;
841
      opt = opt->next;
842
843
    } else {
      ; /* give warning below */
844
845
846
847
848
849
850
851
    }
  }

  while (opt) {
    if (!strcasecmp(opt->key, "LogLevel")) {
      log_fn(LOG_WARN, "Two LogLevel options in a row without intervening LogFile");
      opt = opt->next;
    } else {
852
      tor_assert(!strcasecmp(opt->key, "LogFile"));
853
854
      if (opt->next && !strcasecmp(opt->next->key, "LogLevel")) {
        /* LogFile followed by LogLevel */
855
856
        if (add_single_log(opt->next, opt, options->RunAsDaemon)<0)
          return -1;
857
858
859
        opt = opt->next->next;
      } else {
        /* LogFile followed by LogFile or end of list. */
860
861
        if (add_single_log(NULL, opt, options->RunAsDaemon)<0)
          return -1;
862
863
864
865
866
867
868
        opt = opt->next;
      }
    }
  }

  if (options->DebugLogFile) {
    log_fn(LOG_WARN, "DebugLogFile is deprecated; use LogFile and LogLevel instead");
869
870
    if (add_file_log(LOG_DEBUG, LOG_ERR, options->DebugLogFile)<0)
      return -1;
871
  }
872
  return 0;
873
874
}

875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
void
config_parse_exit_policy(struct config_line_t *cfg,
                         struct exit_policy_t **dest)
{
  struct exit_policy_t **nextp;
  char *e, *s;
  int last=0;
  char line[1024];

  if (!cfg)
    return;
  nextp = dest;
  while (*nextp)
    nextp = &((*nextp)->next);

  for (; cfg; cfg = cfg->next) {
    s = cfg->value;
    for (;;) {
      e = strchr(s,',');
      if(!e) {
        last = 1;
        strncpy(line,s,1023);
      } else {
        memcpy(line,s, ((e-s)<1023)?(e-s):1023);
      line[e-s] = 0;
      }
      line[1023]=0;
      log_fn(LOG_DEBUG,"Adding new entry '%s'",line);
      *nextp = router_parse_exit_policy_from_string(line);
      if(*nextp) {
        nextp = &((*nextp)->next);
      } else {
        log_fn(LOG_WARN,"Malformed exit policy %s; skipping.", line);
      }
      if (last)
        break;
      s = e+1;
    }
  }
}

void exit_policy_free(struct exit_policy_t *p) {
  struct exit_policy_t *e;
  while (p) {
    e = p;
    p = p->next;
    tor_free(e->string);
    tor_free(e);
  }
}

926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
const char *get_data_directory(or_options_t *options) {
  const char *d;
  char buf[1024];
  const char *home;
  size_t n;
  if (options->DataDirectory)
    d = options->DataDirectory;
  else
    d = "~/.tor";

  if (!strncmp(d,"~/",2)) {
    home = getenv("HOME");
    if (!home) {
      log_fn(LOG_ERR, "Couldn't find $HOME environment variable for data directory %s", d);
      exit(1);
    }
    n = snprintf(buf,1020,"%s/%s",home,d+2);
    if (n>=1020) {
      log_fn(LOG_ERR, "Overlong data directory name.");
      exit(1);
    }
    tor_free(options->DataDirectory);
    options->DataDirectory = tor_strdup(buf);
  }
  return options->DataDirectory;
}

953
954
955
956
957
958
959
/*
  Local Variables:
  mode:c
  indent-tabs-mode:nil
  c-basic-offset:2
  End:
*/