747dbd89c1dc8dad313d98f87cf9807eb8b66bda
[tinc] / net_setup.c
1 /*
2     net_setup.c -- Setup.
3     Copyright (C) 1998-2005 Ivo Timmermans,
4                   2000-2013 Guus Sliepen <guus@tinc-vpn.org>
5                   2006      Scott Lamb <slamb@slamb.org>
6                   2010      Brandon Black <blblack@gmail.com>
7
8     This program is free software; you can redistribute it and/or modify
9     it under the terms of the GNU General Public License as published by
10     the Free Software Foundation; either version 2 of the License, or
11     (at your option) any later version.
12
13     This program is distributed in the hope that it will be useful,
14     but WITHOUT ANY WARRANTY; without even the implied warranty of
15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16     GNU General Public License for more details.
17
18     You should have received a copy of the GNU General Public License along
19     with this program; if not, write to the Free Software Foundation, Inc.,
20     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22
23 #include "system.h"
24
25 #include "cipher.h"
26 #include "conf.h"
27 #include "connection.h"
28 #include "control.h"
29 #include "device.h"
30 #include "digest.h"
31 #include "ecdsa.h"
32 #include "graph.h"
33 #include "logger.h"
34 #include "names.h"
35 #include "net.h"
36 #include "netutl.h"
37 #include "process.h"
38 #include "protocol.h"
39 #include "route.h"
40 #include "rsa.h"
41 #include "subnet.h"
42 #include "utils.h"
43 #include "xalloc.h"
44
45 char *myport;
46 static io_t device_io;
47 devops_t devops;
48
49 char *proxyhost;
50 char *proxyport;
51 char *proxyuser;
52 char *proxypass;
53 proxytype_t proxytype;
54 int autoconnect;
55 bool disablebuggypeers;
56
57 char *scriptinterpreter;
58 char *scriptextension;
59
60 bool node_read_ecdsa_public_key(node_t *n) {
61         if(ecdsa_active(n->ecdsa))
62                 return true;
63
64         splay_tree_t *config_tree;
65         FILE *fp;
66         char *pubname = NULL;
67         char *p;
68
69         init_configuration(&config_tree);
70         if(!read_host_config(config_tree, n->name))
71                 goto exit;
72
73         /* First, check for simple ECDSAPublicKey statement */
74
75         if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
76                 n->ecdsa = ecdsa_set_base64_public_key(p);
77                 free(p);
78                 goto exit;
79         }
80
81         /* Else, check for ECDSAPublicKeyFile statement and read it */
82
83         if(!get_config_string(lookup_config(config_tree, "ECDSAPublicKeyFile"), &pubname))
84                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
85
86         fp = fopen(pubname, "r");
87
88         if(!fp) {
89                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s", pubname, strerror(errno));
90                 goto exit;
91         }
92
93         n->ecdsa = ecdsa_read_pem_public_key(fp);
94         fclose(fp);
95
96 exit:
97         exit_configuration(&config_tree);
98         free(pubname);
99         return n->ecdsa;
100 }
101
102 bool read_ecdsa_public_key(connection_t *c) {
103         if(ecdsa_active(c->ecdsa))
104                 return true;
105
106         FILE *fp;
107         char *fname;
108         char *p;
109
110         if(!c->config_tree) {
111                 init_configuration(&c->config_tree);
112                 if(!read_host_config(c->config_tree, c->name))
113                         return false;
114         }
115
116         /* First, check for simple ECDSAPublicKey statement */
117
118         if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
119                 c->ecdsa = ecdsa_set_base64_public_key(p);
120                 free(p);
121                 return c->ecdsa;
122         }
123
124         /* Else, check for ECDSAPublicKeyFile statement and read it */
125
126         if(!get_config_string(lookup_config(c->config_tree, "ECDSAPublicKeyFile"), &fname))
127                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
128
129         fp = fopen(fname, "r");
130
131         if(!fp) {
132                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s",
133                            fname, strerror(errno));
134                 free(fname);
135                 return false;
136         }
137
138         c->ecdsa = ecdsa_read_pem_public_key(fp);
139         fclose(fp);
140
141         if(!c->ecdsa)
142                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing ECDSA public key file `%s' failed.", fname);
143         free(fname);
144         return c->ecdsa;
145 }
146
147 bool read_rsa_public_key(connection_t *c) {
148         if(ecdsa_active(c->ecdsa))
149                 return true;
150
151         FILE *fp;
152         char *fname;
153         char *n;
154
155         /* First, check for simple PublicKey statement */
156
157         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
158                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
159                 free(n);
160                 return c->rsa;
161         }
162
163         /* Else, check for PublicKeyFile statement and read it */
164
165         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
166                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
167
168         fp = fopen(fname, "r");
169
170         if(!fp) {
171                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
172                 free(fname);
173                 return false;
174         }
175
176         c->rsa = rsa_read_pem_public_key(fp);
177         fclose(fp);
178
179         if(!c->rsa)
180                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
181         free(fname);
182         return c->rsa;
183 }
184
185 static bool read_ecdsa_private_key(void) {
186         FILE *fp;
187         char *fname;
188
189         /* Check for PrivateKeyFile statement and read it */
190
191         if(!get_config_string(lookup_config(config_tree, "ECDSAPrivateKeyFile"), &fname))
192                 xasprintf(&fname, "%s" SLASH "ecdsa_key.priv", confbase);
193
194         fp = fopen(fname, "r");
195
196         if(!fp) {
197                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA private key file `%s': %s", fname, strerror(errno));
198                 if(errno == ENOENT)
199                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an ECDSA keypair with `tinc -n %s generate-ecdsa-keys'.", netname ?: ".");
200                 free(fname);
201                 return false;
202         }
203
204 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
205         struct stat s;
206
207         if(fstat(fileno(fp), &s)) {
208                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat ECDSA private key file `%s': %s'", fname, strerror(errno));
209                 free(fname);
210                 return false;
211         }
212
213         if(s.st_mode & ~0100700)
214                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for ECDSA private key file `%s'!", fname);
215 #endif
216
217         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
218         fclose(fp);
219
220         if(!myself->connection->ecdsa)
221                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
222         free(fname);
223         return myself->connection->ecdsa;
224 }
225
226 static bool read_invitation_key(void) {
227         FILE *fp;
228         char *fname;
229
230         if(invitation_key) {
231                 ecdsa_free(invitation_key);
232                 invitation_key = NULL;
233         }
234
235         xasprintf(&fname, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", confbase);
236
237         fp = fopen(fname, "r");
238
239         if(fp) {
240                 invitation_key = ecdsa_read_pem_private_key(fp);
241                 fclose(fp);
242                 if(!invitation_key)
243                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
244         }
245
246         free(fname);
247         return invitation_key;
248 }
249
250 static bool read_rsa_private_key(void) {
251         FILE *fp;
252         char *fname;
253         char *n, *d;
254
255         /* First, check for simple PrivateKey statement */
256
257         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
258                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
259                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
260                         free(d);
261                         return false;
262                 }
263                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
264                 free(n);
265                 free(d);
266                 return myself->connection->rsa;
267         }
268
269         /* Else, check for PrivateKeyFile statement and read it */
270
271         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
272                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
273
274         fp = fopen(fname, "r");
275
276         if(!fp) {
277                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
278                            fname, strerror(errno));
279                 free(fname);
280                 return false;
281         }
282
283 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
284         struct stat s;
285
286         if(fstat(fileno(fp), &s)) {
287                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
288                 free(fname);
289                 return false;
290         }
291
292         if(s.st_mode & ~0100700)
293                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
294 #endif
295
296         myself->connection->rsa = rsa_read_pem_private_key(fp);
297         fclose(fp);
298
299         if(!myself->connection->rsa)
300                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
301         free(fname);
302         return myself->connection->rsa;
303 }
304
305 static timeout_t keyexpire_timeout;
306
307 static void keyexpire_handler(void *data) {
308         regenerate_key();
309         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
310 }
311
312 void regenerate_key(void) {
313         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
314         send_key_changed();
315 }
316
317 /*
318   Read Subnets from all host config files
319 */
320 void load_all_subnets(void) {
321         DIR *dir;
322         struct dirent *ent;
323         char *dname;
324
325         xasprintf(&dname, "%s" SLASH "hosts", confbase);
326         dir = opendir(dname);
327         if(!dir) {
328                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
329                 free(dname);
330                 return;
331         }
332
333         while((ent = readdir(dir))) {
334                 if(!check_id(ent->d_name))
335                         continue;
336
337                 node_t *n = lookup_node(ent->d_name);
338                 #ifdef _DIRENT_HAVE_D_TYPE
339                 //if(ent->d_type != DT_REG)
340                 //      continue;
341                 #endif
342
343                 splay_tree_t *config_tree;
344                 init_configuration(&config_tree);
345                 read_config_options(config_tree, ent->d_name);
346                 read_host_config(config_tree, ent->d_name);
347
348                 if(!n) {
349                         n = new_node();
350                         n->name = xstrdup(ent->d_name);
351                         node_add(n);
352                 }
353
354                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
355                         subnet_t *s, *s2;
356
357                         if(!get_config_subnet(cfg, &s))
358                                 continue;
359
360                         if((s2 = lookup_subnet(n, s))) {
361                                 s2->expires = -1;
362                         } else {
363                                 subnet_add(n, s);
364                         }
365                 }
366
367                 exit_configuration(&config_tree);
368         }
369
370         closedir(dir);
371 }
372
373 void load_all_nodes(void) {
374         DIR *dir;
375         struct dirent *ent;
376         char *dname;
377
378         xasprintf(&dname, "%s" SLASH "hosts", confbase);
379         dir = opendir(dname);
380         if(!dir) {
381                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
382                 free(dname);
383                 return;
384         }
385
386         while((ent = readdir(dir))) {
387                 if(!check_id(ent->d_name))
388                         continue;
389
390                 node_t *n = lookup_node(ent->d_name);
391                 if(n)
392                         continue;
393
394                 n = new_node();
395                 n->name = xstrdup(ent->d_name);
396                 node_add(n);
397         }
398
399         closedir(dir);
400 }
401
402
403 char *get_name(void) {
404         char *name = NULL;
405
406         get_config_string(lookup_config(config_tree, "Name"), &name);
407
408         if(!name)
409                 return NULL;
410
411         if(*name == '$') {
412                 char *envname = getenv(name + 1);
413                 if(!envname) {
414                         if(strcmp(name + 1, "HOST")) {
415                                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1);
416                                 return false;
417                         }
418                         char envname[32];
419                         if(gethostname(envname, 32)) {
420                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", strerror(errno));
421                                 return false;
422                         }
423                         envname[31] = 0;
424                 }
425                 free(name);
426                 name = xstrdup(envname);
427                 for(char *c = name; *c; c++)
428                         if(!isalnum(*c))
429                                 *c = '_';
430         }
431
432         if(!check_id(name)) {
433                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
434                 free(name);
435                 return false;
436         }
437
438         return name;
439 }
440
441 bool setup_myself_reloadable(void) {
442         char *proxy = NULL;
443         char *rmode = NULL;
444         char *fmode = NULL;
445         char *bmode = NULL;
446         char *afname = NULL;
447         char *space;
448         bool choice;
449
450         free(scriptinterpreter);
451         scriptinterpreter = NULL;
452         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
453
454
455         free(scriptextension);
456         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
457 #ifdef HAVE_MINGW
458                 scriptextension = xstrdup(".bat");
459 #else
460                 scriptextension = xstrdup("");
461 #endif
462
463         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
464         if(proxy) {
465                 if((space = strchr(proxy, ' ')))
466                         *space++ = 0;
467
468                 if(!strcasecmp(proxy, "none")) {
469                         proxytype = PROXY_NONE;
470                 } else if(!strcasecmp(proxy, "socks4")) {
471                         proxytype = PROXY_SOCKS4;
472                 } else if(!strcasecmp(proxy, "socks4a")) {
473                         proxytype = PROXY_SOCKS4A;
474                 } else if(!strcasecmp(proxy, "socks5")) {
475                         proxytype = PROXY_SOCKS5;
476                 } else if(!strcasecmp(proxy, "http")) {
477                         proxytype = PROXY_HTTP;
478                 } else if(!strcasecmp(proxy, "exec")) {
479                         proxytype = PROXY_EXEC;
480                 } else {
481                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
482                         return false;
483                 }
484
485                 switch(proxytype) {
486                         case PROXY_NONE:
487                         default:
488                                 break;
489
490                         case PROXY_EXEC:
491                                 if(!space || !*space) {
492                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
493                                         return false;
494                                 }
495                                 proxyhost =  xstrdup(space);
496                                 break;
497
498                         case PROXY_SOCKS4:
499                         case PROXY_SOCKS4A:
500                         case PROXY_SOCKS5:
501                         case PROXY_HTTP:
502                                 proxyhost = space;
503                                 if(space && (space = strchr(space, ' ')))
504                                         *space++ = 0, proxyport = space;
505                                 if(space && (space = strchr(space, ' ')))
506                                         *space++ = 0, proxyuser = space;
507                                 if(space && (space = strchr(space, ' ')))
508                                         *space++ = 0, proxypass = space;
509                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
510                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
511                                         return false;
512                                 }
513                                 proxyhost = xstrdup(proxyhost);
514                                 proxyport = xstrdup(proxyport);
515                                 if(proxyuser && *proxyuser)
516                                         proxyuser = xstrdup(proxyuser);
517                                 if(proxypass && *proxypass)
518                                         proxypass = xstrdup(proxypass);
519                                 break;
520                 }
521
522                 free(proxy);
523         }
524
525         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
526                 myself->options |= OPTION_INDIRECT;
527
528         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
529                 myself->options |= OPTION_TCPONLY;
530
531         if(myself->options & OPTION_TCPONLY)
532                 myself->options |= OPTION_INDIRECT;
533
534         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
535         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
536
537         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
538                 if(!strcasecmp(rmode, "router"))
539                         routing_mode = RMODE_ROUTER;
540                 else if(!strcasecmp(rmode, "switch"))
541                         routing_mode = RMODE_SWITCH;
542                 else if(!strcasecmp(rmode, "hub"))
543                         routing_mode = RMODE_HUB;
544                 else {
545                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
546                         return false;
547                 }
548                 free(rmode);
549         }
550
551         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
552                 if(!strcasecmp(fmode, "off"))
553                         forwarding_mode = FMODE_OFF;
554                 else if(!strcasecmp(fmode, "internal"))
555                         forwarding_mode = FMODE_INTERNAL;
556                 else if(!strcasecmp(fmode, "kernel"))
557                         forwarding_mode = FMODE_KERNEL;
558                 else {
559                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
560                         return false;
561                 }
562                 free(fmode);
563         }
564
565         choice = true;
566         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
567         if(choice)
568                 myself->options |= OPTION_PMTU_DISCOVERY;
569
570         choice = true;
571         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
572         if(choice)
573                 myself->options |= OPTION_CLAMP_MSS;
574
575         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
576         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
577         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
578                 if(!strcasecmp(bmode, "no"))
579                         broadcast_mode = BMODE_NONE;
580                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
581                         broadcast_mode = BMODE_MST;
582                 else if(!strcasecmp(bmode, "direct"))
583                         broadcast_mode = BMODE_DIRECT;
584                 else {
585                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
586                         return false;
587                 }
588                 free(bmode);
589         }
590
591 #if !defined(SOL_IP) || !defined(IP_TOS)
592         if(priorityinheritance)
593                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
594 #endif
595
596         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
597                 macexpire = 600;
598
599         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
600                 if(maxtimeout <= 0) {
601                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
602                         return false;
603                 }
604         } else
605                 maxtimeout = 900;
606
607         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
608                 if(!strcasecmp(afname, "IPv4"))
609                         addressfamily = AF_INET;
610                 else if(!strcasecmp(afname, "IPv6"))
611                         addressfamily = AF_INET6;
612                 else if(!strcasecmp(afname, "any"))
613                         addressfamily = AF_UNSPEC;
614                 else {
615                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
616                         return false;
617                 }
618                 free(afname);
619         }
620
621         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
622
623         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
624                 keylifetime = 3600;
625
626         get_config_int(lookup_config(config_tree, "AutoConnect"), &autoconnect);
627
628         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
629
630         read_invitation_key();
631
632         return true;
633 }
634
635 /*
636   Configure node_t myself and set up the local sockets (listen only)
637 */
638 static bool setup_myself(void) {
639         char *name, *hostname, *cipher, *digest, *type;
640         char *address = NULL;
641
642         if(!(name = get_name())) {
643                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
644                 return false;
645         }
646
647         myself = new_node();
648         myself->connection = new_connection();
649         myself->name = name;
650         myself->connection->name = xstrdup(name);
651         read_host_config(config_tree, name);
652
653         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
654                 myport = xstrdup("655");
655
656         xasprintf(&myself->hostname, "MYSELF port %s", myport);
657         myself->connection->hostname = xstrdup(myself->hostname);
658
659         myself->connection->options = 0;
660         myself->connection->protocol_major = PROT_MAJOR;
661         myself->connection->protocol_minor = PROT_MINOR;
662
663         myself->options |= PROT_MINOR << 24;
664
665         get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental);
666
667         if(experimental && !read_ecdsa_private_key())
668                 return false;
669
670         if(!read_rsa_private_key())
671                 return false;
672
673         if(!atoi(myport)) {
674                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
675                 sockaddr_t sa;
676                 if(!ai || !ai->ai_addr)
677                         return false;
678                 free(myport);
679                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
680                 sockaddr2str(&sa, NULL, &myport);
681         }
682
683         /* Read in all the subnets specified in the host configuration file */
684
685         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
686                 subnet_t *subnet;
687
688                 if(!get_config_subnet(cfg, &subnet))
689                         return false;
690
691                 subnet_add(myself, subnet);
692         }
693
694         /* Check some options */
695
696         if(!setup_myself_reloadable())
697                 return false;
698
699         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
700         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
701         strictsubnets |= tunnelserver;
702
703
704
705         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
706                 if(udp_rcvbuf <= 0) {
707                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
708                         return false;
709                 }
710         }
711
712         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
713                 if(udp_sndbuf <= 0) {
714                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
715                         return false;
716                 }
717         }
718
719         int replaywin_int;
720         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
721                 if(replaywin_int < 0) {
722                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
723                         return false;
724                 }
725                 replaywin = (unsigned)replaywin_int;
726                 sptps_replaywin = replaywin;
727         }
728
729         /* Generate packet encryption key */
730
731         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
732                 cipher = xstrdup("blowfish");
733
734         if(!(myself->incipher = cipher_open_by_name(cipher))) {
735                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
736                 return false;
737         }
738
739         free(cipher);
740
741         send_key_changed();
742         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
743
744         /* Check if we want to use message authentication codes... */
745
746         int maclength = 4;
747         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
748
749         if(maclength < 0) {
750                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
751                 return false;
752         }
753
754         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
755                 digest = xstrdup("sha1");
756
757         if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
758                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
759                 return false;
760         }
761
762         free(digest);
763
764         /* Compression */
765
766         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
767                 if(myself->incompression < 0 || myself->incompression > 11) {
768                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
769                         return false;
770                 }
771         } else
772                 myself->incompression = 0;
773
774         myself->connection->outcompression = 0;
775
776         /* Done */
777
778         myself->nexthop = myself;
779         myself->via = myself;
780         myself->status.reachable = true;
781         myself->last_state_change = now.tv_sec;
782         myself->status.sptps = experimental;
783         node_add(myself);
784
785         graph();
786
787         if(strictsubnets)
788                 load_all_subnets();
789         else if(autoconnect)
790                 load_all_nodes();
791
792         /* Open device */
793
794         devops = os_devops;
795
796         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
797                 if(!strcasecmp(type, "dummy"))
798                         devops = dummy_devops;
799                 else if(!strcasecmp(type, "raw_socket"))
800                         devops = raw_socket_devops;
801                 else if(!strcasecmp(type, "multicast"))
802                         devops = multicast_devops;
803 #ifdef ENABLE_UML
804                 else if(!strcasecmp(type, "uml"))
805                         devops = uml_devops;
806 #endif
807 #ifdef ENABLE_VDE
808                 else if(!strcasecmp(type, "vde"))
809                         devops = vde_devops;
810 #endif
811         }
812
813         if(!devops.setup())
814                 return false;
815
816         if(device_fd >= 0)
817                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
818
819         /* Run tinc-up script to further initialize the tap interface */
820         char *envp[5];
821         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
822         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
823         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
824         xasprintf(&envp[3], "NAME=%s", myself->name);
825         envp[4] = NULL;
826
827         execute_script("tinc-up", envp);
828
829         for(int i = 0; i < 4; i++)
830                 free(envp[i]);
831
832         /* Run subnet-up scripts for our own subnets */
833
834         subnet_update(myself, NULL, true);
835
836         /* Open sockets */
837
838 #ifndef HAVE_MINGW
839         int unix_fd = socket(AF_UNIX, SOCK_STREAM, 0);
840         if(unix_fd < 0) {
841                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not create UNIX socket: %s", sockstrerror(errno));
842                 return false;
843         }
844
845         struct sockaddr_un sa;
846         sa.sun_family = AF_UNIX;
847         strncpy(sa.sun_path, unixsocketname, sizeof sa.sun_path);
848
849         if(connect(unix_fd, (struct sockaddr *)&sa, sizeof sa) >= 0) {
850                 logger(DEBUG_ALWAYS, LOG_ERR, "UNIX socket %s is still in use!", unixsocketname);
851                 return false;
852         }
853
854         unlink(unixsocketname);
855
856         if(bind(unix_fd, (struct sockaddr *)&sa, sizeof sa) < 0) {
857                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not bind UNIX socket to %s: %s", unixsocketname, sockstrerror(errno));
858                 return false;
859         }
860
861         if(listen(unix_fd, 3) < 0) {
862                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not listen on UNIX socket %s: %s", unixsocketname, sockstrerror(errno));
863                 return false;
864         }
865
866         io_add(&unix_socket, handle_new_unix_connection, &unix_socket, unix_fd, IO_READ);
867 #endif
868
869         if(!do_detach && getenv("LISTEN_FDS")) {
870                 sockaddr_t sa;
871                 socklen_t salen;
872
873                 listen_sockets = atoi(getenv("LISTEN_FDS"));
874 #ifdef HAVE_UNSETENV
875                 unsetenv("LISTEN_FDS");
876 #endif
877
878                 if(listen_sockets > MAXSOCKETS) {
879                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
880                         return false;
881                 }
882
883                 for(int i = 0; i < listen_sockets; i++) {
884                         salen = sizeof sa;
885                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
886                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
887                                 return false;
888                         }
889
890 #ifdef FD_CLOEXEC
891                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
892 #endif
893
894                         int udp_fd = setup_vpn_in_socket(&sa);
895                         if(udp_fd < 0)
896                                 return false;
897
898                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
899                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
900
901                         if(debug_level >= DEBUG_CONNECTIONS) {
902                                 hostname = sockaddr2hostname(&sa);
903                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
904                                 free(hostname);
905                         }
906
907                         memcpy(&listen_socket[i].sa, &sa, salen);
908                 }
909         } else {
910                 listen_sockets = 0;
911                 config_t *cfg = lookup_config(config_tree, "BindToAddress");
912
913                 do {
914                         get_config_string(cfg, &address);
915                         if(cfg)
916                                 cfg = lookup_config_next(config_tree, cfg);
917
918                         char *port = myport;
919
920                         if(address) {
921                                 char *space = strchr(address, ' ');
922                                 if(space) {
923                                         *space++ = 0;
924                                         port = space;
925                                 }
926
927                                 if(!strcmp(address, "*"))
928                                         *address = 0;
929                         }
930
931                         struct addrinfo *ai, hint = {0};
932                         hint.ai_family = addressfamily;
933                         hint.ai_socktype = SOCK_STREAM;
934                         hint.ai_protocol = IPPROTO_TCP;
935                         hint.ai_flags = AI_PASSIVE;
936
937                         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
938                         free(address);
939
940                         if(err || !ai) {
941                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
942                                            gai_strerror(err));
943                                 return false;
944                         }
945
946                         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
947                                 if(listen_sockets >= MAXSOCKETS) {
948                                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
949                                         return false;
950                                 }
951
952                                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
953
954                                 if(tcp_fd < 0)
955                                         continue;
956
957                                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
958
959                                 if(tcp_fd < 0) {
960                                         close(tcp_fd);
961                                         continue;
962                                 }
963
964                                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
965                                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
966
967                                 if(debug_level >= DEBUG_CONNECTIONS) {
968                                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
969                                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
970                                         free(hostname);
971                                 }
972
973                                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
974                                 listen_sockets++;
975                         }
976
977                         freeaddrinfo(ai);
978                 } while(cfg);
979         }
980
981         if(listen_sockets)
982                 logger(DEBUG_ALWAYS, LOG_NOTICE, "Ready");
983         else {
984                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
985                 return false;
986         }
987
988         last_config_check = now.tv_sec;
989
990         return true;
991 }
992
993 /*
994   initialize network
995 */
996 bool setup_network(void) {
997         init_connections();
998         init_subnets();
999         init_nodes();
1000         init_edges();
1001         init_requests();
1002
1003         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1004                 if(pinginterval < 1) {
1005                         pinginterval = 86400;
1006                 }
1007         } else
1008                 pinginterval = 60;
1009
1010         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
1011                 pingtimeout = 5;
1012         if(pingtimeout < 1 || pingtimeout > pinginterval)
1013                 pingtimeout = pinginterval;
1014
1015         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
1016                 maxoutbufsize = 10 * MTU;
1017
1018         if(!setup_myself())
1019                 return false;
1020
1021         return true;
1022 }
1023
1024 /*
1025   close all open network connections
1026 */
1027 void close_network_connections(void) {
1028         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1029                 next = node->next;
1030                 connection_t *c = node->data;
1031                 /* Keep control connections open until the end, so they know when we really terminated */
1032                 if(c->status.control)
1033                         c->socket = -1;
1034                 c->outgoing = NULL;
1035                 terminate_connection(c, false);
1036         }
1037
1038         list_delete_list(outgoing_list);
1039
1040         if(myself && myself->connection) {
1041                 subnet_update(myself, NULL, false);
1042                 terminate_connection(myself->connection, false);
1043                 free_connection(myself->connection);
1044         }
1045
1046         for(int i = 0; i < listen_sockets; i++) {
1047                 io_del(&listen_socket[i].tcp);
1048                 io_del(&listen_socket[i].udp);
1049                 close(listen_socket[i].tcp.fd);
1050                 close(listen_socket[i].udp.fd);
1051         }
1052
1053 #ifndef HAVE_MINGW
1054         io_del(&unix_socket);
1055         close(unix_socket.fd);
1056 #endif
1057
1058         char *envp[5];
1059         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
1060         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
1061         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
1062         xasprintf(&envp[3], "NAME=%s", myself->name);
1063         envp[4] = NULL;
1064
1065         exit_requests();
1066         exit_edges();
1067         exit_subnets();
1068         exit_nodes();
1069         exit_connections();
1070
1071         execute_script("tinc-down", envp);
1072
1073         if(myport) free(myport);
1074
1075         for(int i = 0; i < 4; i++)
1076                 free(envp[i]);
1077
1078         devops.close();
1079
1080         return;
1081 }