Document the control protocol.
[tinc] / src / net_setup.c
1 /*
2     net_setup.c -- Setup.
3     Copyright (C) 1998-2005 Ivo Timmermans,
4                   2000-2017 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 "script.h"
42 #include "subnet.h"
43 #include "utils.h"
44 #include "xalloc.h"
45
46 #ifdef HAVE_MINIUPNPC
47 #include "upnp.h"
48 #endif
49
50 char *myport;
51 static io_t device_io;
52 devops_t devops;
53 bool device_standby = false;
54
55 char *proxyhost;
56 char *proxyport;
57 char *proxyuser;
58 char *proxypass;
59 proxytype_t proxytype;
60 bool autoconnect;
61 bool disablebuggypeers;
62
63 char *scriptinterpreter;
64 char *scriptextension;
65
66 bool node_read_ecdsa_public_key(node_t *n) {
67         if(ecdsa_active(n->ecdsa)) {
68                 return true;
69         }
70
71         splay_tree_t *config_tree;
72         FILE *fp;
73         char *pubname = NULL;
74         char *p;
75
76         init_configuration(&config_tree);
77
78         if(!read_host_config(config_tree, n->name, true)) {
79                 goto exit;
80         }
81
82         /* First, check for simple Ed25519PublicKey statement */
83
84         if(get_config_string(lookup_config(config_tree, "Ed25519PublicKey"), &p)) {
85                 n->ecdsa = ecdsa_set_base64_public_key(p);
86                 free(p);
87                 goto exit;
88         }
89
90         /* Else, check for Ed25519PublicKeyFile statement and read it */
91
92         if(!get_config_string(lookup_config(config_tree, "Ed25519PublicKeyFile"), &pubname)) {
93                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
94         }
95
96         fp = fopen(pubname, "r");
97
98         if(!fp) {
99                 goto exit;
100         }
101
102         n->ecdsa = ecdsa_read_pem_public_key(fp);
103         fclose(fp);
104
105 exit:
106         exit_configuration(&config_tree);
107         free(pubname);
108         return n->ecdsa;
109 }
110
111 bool read_ecdsa_public_key(connection_t *c) {
112         if(ecdsa_active(c->ecdsa)) {
113                 return true;
114         }
115
116         FILE *fp;
117         char *fname;
118         char *p;
119
120         if(!c->config_tree) {
121                 init_configuration(&c->config_tree);
122
123                 if(!read_host_config(c->config_tree, c->name, true)) {
124                         return false;
125                 }
126         }
127
128         /* First, check for simple Ed25519PublicKey statement */
129
130         if(get_config_string(lookup_config(c->config_tree, "Ed25519PublicKey"), &p)) {
131                 c->ecdsa = ecdsa_set_base64_public_key(p);
132                 free(p);
133                 return c->ecdsa;
134         }
135
136         /* Else, check for Ed25519PublicKeyFile statement and read it */
137
138         if(!get_config_string(lookup_config(c->config_tree, "Ed25519PublicKeyFile"), &fname)) {
139                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
140         }
141
142         fp = fopen(fname, "r");
143
144         if(!fp) {
145                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 public key file `%s': %s",
146                        fname, strerror(errno));
147                 free(fname);
148                 return false;
149         }
150
151         c->ecdsa = ecdsa_read_pem_public_key(fp);
152
153         if(!c->ecdsa && errno != ENOENT) {
154                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing Ed25519 public key file `%s' failed.", fname);
155         }
156
157         fclose(fp);
158         free(fname);
159         return c->ecdsa;
160 }
161
162 #ifndef DISABLE_LEGACY
163 bool read_rsa_public_key(connection_t *c) {
164         FILE *fp;
165         char *fname;
166         char *n;
167
168         /* First, check for simple PublicKey statement */
169
170         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
171                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
172                 free(n);
173                 return c->rsa;
174         }
175
176         /* Else, check for PublicKeyFile statement and read it */
177
178         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) {
179                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
180         }
181
182         fp = fopen(fname, "r");
183
184         if(!fp) {
185                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
186                 free(fname);
187                 return false;
188         }
189
190         c->rsa = rsa_read_pem_public_key(fp);
191         fclose(fp);
192
193         if(!c->rsa) {
194                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
195         }
196
197         free(fname);
198         return c->rsa;
199 }
200 #endif
201
202 static bool read_ecdsa_private_key(void) {
203         FILE *fp;
204         char *fname;
205
206         /* Check for PrivateKeyFile statement and read it */
207
208         if(!get_config_string(lookup_config(config_tree, "Ed25519PrivateKeyFile"), &fname)) {
209                 xasprintf(&fname, "%s" SLASH "ed25519_key.priv", confbase);
210         }
211
212         fp = fopen(fname, "r");
213
214         if(!fp) {
215                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 private key file `%s': %s", fname, strerror(errno));
216
217                 if(errno == ENOENT) {
218                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an Ed25519 keypair with `tinc -n %s generate-ed25519-keys'.", netname ? : ".");
219                 }
220
221                 free(fname);
222                 return false;
223         }
224
225 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
226         struct stat s;
227
228         if(fstat(fileno(fp), &s)) {
229                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat Ed25519 private key file `%s': %s'", fname, strerror(errno));
230                 free(fname);
231                 return false;
232         }
233
234         if(s.st_mode & ~0100700) {
235                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for Ed25519 private key file `%s'!", fname);
236         }
237
238 #endif
239
240         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
241         fclose(fp);
242
243         if(!myself->connection->ecdsa) {
244                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
245         }
246
247         free(fname);
248         return myself->connection->ecdsa;
249 }
250
251 static bool read_invitation_key(void) {
252         FILE *fp;
253         char fname[PATH_MAX];
254
255         if(invitation_key) {
256                 ecdsa_free(invitation_key);
257                 invitation_key = NULL;
258         }
259
260         snprintf(fname, sizeof(fname), "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
261
262         fp = fopen(fname, "r");
263
264         if(fp) {
265                 invitation_key = ecdsa_read_pem_private_key(fp);
266                 fclose(fp);
267
268                 if(!invitation_key) {
269                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
270                 }
271         }
272
273         return invitation_key;
274 }
275
276 #ifndef DISABLE_LEGACY
277 static bool read_rsa_private_key(void) {
278         FILE *fp;
279         char *fname;
280         char *n, *d;
281
282         /* First, check for simple PrivateKey statement */
283
284         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
285                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
286                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
287                         free(d);
288                         return false;
289                 }
290
291                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
292                 free(n);
293                 free(d);
294                 return myself->connection->rsa;
295         }
296
297         /* Else, check for PrivateKeyFile statement and read it */
298
299         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname)) {
300                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
301         }
302
303         fp = fopen(fname, "r");
304
305         if(!fp) {
306                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
307                        fname, strerror(errno));
308
309                 if(errno == ENOENT) {
310                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an RSA keypair with `tinc -n %s generate-rsa-keys'.", netname ? : ".");
311                 }
312
313                 free(fname);
314                 return false;
315         }
316
317 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
318         struct stat s;
319
320         if(fstat(fileno(fp), &s)) {
321                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
322                 free(fname);
323                 return false;
324         }
325
326         if(s.st_mode & ~0100700) {
327                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
328         }
329
330 #endif
331
332         myself->connection->rsa = rsa_read_pem_private_key(fp);
333         fclose(fp);
334
335         if(!myself->connection->rsa) {
336                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
337         }
338
339         free(fname);
340         return myself->connection->rsa;
341 }
342 #endif
343
344 static timeout_t keyexpire_timeout;
345
346 static void keyexpire_handler(void *data) {
347         regenerate_key();
348         timeout_set(data, &(struct timeval) {
349                 keylifetime, rand() % 100000
350         });
351 }
352
353 void regenerate_key(void) {
354         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
355         send_key_changed();
356
357         for splay_each(node_t, n, node_tree) {
358                 n->status.validkey_in = false;
359         }
360 }
361
362 void load_all_nodes(void) {
363         DIR *dir;
364         struct dirent *ent;
365         char dname[PATH_MAX];
366
367         snprintf(dname, sizeof(dname), "%s" SLASH "hosts", confbase);
368         dir = opendir(dname);
369
370         if(!dir) {
371                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
372                 return;
373         }
374
375         while((ent = readdir(dir))) {
376                 if(!check_id(ent->d_name)) {
377                         continue;
378                 }
379
380                 node_t *n = lookup_node(ent->d_name);
381
382                 splay_tree_t *config_tree;
383                 init_configuration(&config_tree);
384                 read_config_options(config_tree, ent->d_name);
385                 read_host_config(config_tree, ent->d_name, true);
386
387                 if(!n) {
388                         n = new_node();
389                         n->name = xstrdup(ent->d_name);
390                         node_add(n);
391                 }
392
393                 if(strictsubnets) {
394                         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
395                                 subnet_t *s, *s2;
396
397                                 if(!get_config_subnet(cfg, &s)) {
398                                         continue;
399                                 }
400
401                                 if((s2 = lookup_subnet(n, s))) {
402                                         s2->expires = -1;
403                                         free(s);
404                                 } else {
405                                         subnet_add(n, s);
406                                 }
407                         }
408                 }
409
410                 if(lookup_config(config_tree, "Address")) {
411                         n->status.has_address = true;
412                 }
413
414                 exit_configuration(&config_tree);
415         }
416
417         closedir(dir);
418 }
419
420 char *get_name(void) {
421         char *name = NULL;
422         char *returned_name;
423
424         get_config_string(lookup_config(config_tree, "Name"), &name);
425
426         if(!name) {
427                 return NULL;
428         }
429
430         returned_name = replace_name(name);
431         free(name);
432         return returned_name;
433 }
434
435 bool setup_myself_reloadable(void) {
436         char *proxy = NULL;
437         char *rmode = NULL;
438         char *fmode = NULL;
439         char *bmode = NULL;
440         char *afname = NULL;
441         char *space;
442         bool choice;
443
444         free(scriptinterpreter);
445         scriptinterpreter = NULL;
446         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
447
448
449         free(scriptextension);
450
451         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension)) {
452                 scriptextension = xstrdup("");
453         }
454
455         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
456
457         if(proxy) {
458                 if((space = strchr(proxy, ' '))) {
459                         *space++ = 0;
460                 }
461
462                 if(!strcasecmp(proxy, "none")) {
463                         proxytype = PROXY_NONE;
464                 } else if(!strcasecmp(proxy, "socks4")) {
465                         proxytype = PROXY_SOCKS4;
466                 } else if(!strcasecmp(proxy, "socks4a")) {
467                         proxytype = PROXY_SOCKS4A;
468                 } else if(!strcasecmp(proxy, "socks5")) {
469                         proxytype = PROXY_SOCKS5;
470                 } else if(!strcasecmp(proxy, "http")) {
471                         proxytype = PROXY_HTTP;
472                 } else if(!strcasecmp(proxy, "exec")) {
473                         proxytype = PROXY_EXEC;
474                 } else {
475                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
476                         return false;
477                 }
478
479                 switch(proxytype) {
480                 case PROXY_NONE:
481                 default:
482                         break;
483
484                 case PROXY_EXEC:
485                         if(!space || !*space) {
486                                 logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
487                                 return false;
488                         }
489
490                         proxyhost =  xstrdup(space);
491                         break;
492
493                 case PROXY_SOCKS4:
494                 case PROXY_SOCKS4A:
495                 case PROXY_SOCKS5:
496                 case PROXY_HTTP:
497                         proxyhost = space;
498
499                         if(space && (space = strchr(space, ' '))) {
500                                 *space++ = 0, proxyport = space;
501                         }
502
503                         if(space && (space = strchr(space, ' '))) {
504                                 *space++ = 0, proxyuser = space;
505                         }
506
507                         if(space && (space = strchr(space, ' '))) {
508                                 *space++ = 0, proxypass = space;
509                         }
510
511                         if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
512                                 logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
513                                 return false;
514                         }
515
516                         proxyhost = xstrdup(proxyhost);
517                         proxyport = xstrdup(proxyport);
518
519                         if(proxyuser && *proxyuser) {
520                                 proxyuser = xstrdup(proxyuser);
521                         }
522
523                         if(proxypass && *proxypass) {
524                                 proxypass = xstrdup(proxypass);
525                         }
526
527                         break;
528                 }
529
530                 free(proxy);
531         }
532
533         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice) {
534                 myself->options |= OPTION_INDIRECT;
535         }
536
537         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice) {
538                 myself->options |= OPTION_TCPONLY;
539         }
540
541         if(myself->options & OPTION_TCPONLY) {
542                 myself->options |= OPTION_INDIRECT;
543         }
544
545         get_config_bool(lookup_config(config_tree, "UDPDiscovery"), &udp_discovery);
546         get_config_int(lookup_config(config_tree, "UDPDiscoveryKeepaliveInterval"), &udp_discovery_keepalive_interval);
547         get_config_int(lookup_config(config_tree, "UDPDiscoveryInterval"), &udp_discovery_interval);
548         get_config_int(lookup_config(config_tree, "UDPDiscoveryTimeout"), &udp_discovery_timeout);
549
550         get_config_int(lookup_config(config_tree, "MTUInfoInterval"), &mtu_info_interval);
551         get_config_int(lookup_config(config_tree, "UDPInfoInterval"), &udp_info_interval);
552
553         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
554         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
555
556         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
557                 if(!strcasecmp(rmode, "router")) {
558                         routing_mode = RMODE_ROUTER;
559                 } else if(!strcasecmp(rmode, "switch")) {
560                         routing_mode = RMODE_SWITCH;
561                 } else if(!strcasecmp(rmode, "hub")) {
562                         routing_mode = RMODE_HUB;
563                 } else {
564                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
565                         return false;
566                 }
567
568                 free(rmode);
569         }
570
571         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
572                 if(!strcasecmp(fmode, "off")) {
573                         forwarding_mode = FMODE_OFF;
574                 } else if(!strcasecmp(fmode, "internal")) {
575                         forwarding_mode = FMODE_INTERNAL;
576                 } else if(!strcasecmp(fmode, "kernel")) {
577                         forwarding_mode = FMODE_KERNEL;
578                 } else {
579                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
580                         return false;
581                 }
582
583                 free(fmode);
584         }
585
586         choice = !(myself->options & OPTION_TCPONLY);
587         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
588
589         if(choice) {
590                 myself->options |= OPTION_PMTU_DISCOVERY;
591         }
592
593         choice = true;
594         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
595
596         if(choice) {
597                 myself->options |= OPTION_CLAMP_MSS;
598         }
599
600         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
601         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
602
603         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
604                 if(!strcasecmp(bmode, "no")) {
605                         broadcast_mode = BMODE_NONE;
606                 } else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst")) {
607                         broadcast_mode = BMODE_MST;
608                 } else if(!strcasecmp(bmode, "direct")) {
609                         broadcast_mode = BMODE_DIRECT;
610                 } else {
611                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
612                         return false;
613                 }
614
615                 free(bmode);
616         }
617
618         const char *const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
619
620         for(size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
621                 subnet_t *s = new_subnet();
622
623                 if(!str2net(s, DEFAULT_BROADCAST_SUBNETS[i])) {
624                         abort();
625                 }
626
627                 subnet_add(NULL, s);
628         }
629
630         for(config_t *cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
631                 subnet_t *s;
632
633                 if(!get_config_subnet(cfg, &s)) {
634                         continue;
635                 }
636
637                 subnet_add(NULL, s);
638         }
639
640 #if !defined(IP_TOS)
641
642         if(priorityinheritance) {
643                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv4 connections", "PriorityInheritance");
644         }
645
646 #endif
647
648 #if !defined(IPV6_TCLASS)
649
650         if(priorityinheritance) {
651                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv6 connections", "PriorityInheritance");
652         }
653
654 #endif
655
656         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire)) {
657                 macexpire = 600;
658         }
659
660         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
661                 if(maxtimeout <= 0) {
662                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
663                         return false;
664                 }
665         } else {
666                 maxtimeout = 900;
667         }
668
669         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
670                 if(!strcasecmp(afname, "IPv4")) {
671                         addressfamily = AF_INET;
672                 } else if(!strcasecmp(afname, "IPv6")) {
673                         addressfamily = AF_INET6;
674                 } else if(!strcasecmp(afname, "any")) {
675                         addressfamily = AF_UNSPEC;
676                 } else {
677                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
678                         return false;
679                 }
680
681                 free(afname);
682         }
683
684         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
685
686         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime)) {
687                 keylifetime = 3600;
688         }
689
690         config_t *cfg = lookup_config(config_tree, "AutoConnect");
691
692         if(cfg) {
693                 if(!get_config_bool(cfg, &autoconnect)) {
694                         // Some backwards compatibility with when this option was an int
695                         int val = 0;
696                         get_config_int(cfg, &val);
697                         autoconnect = val;
698                 }
699         }
700
701         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
702
703         if(!get_config_int(lookup_config(config_tree, "InvitationExpire"), &invitation_lifetime)) {
704                 invitation_lifetime = 604800;        // 1 week
705         }
706
707         read_invitation_key();
708
709         return true;
710 }
711
712 /*
713   Add listening sockets.
714 */
715 static bool add_listen_address(char *address, bool bindto) {
716         char *port = myport;
717
718         if(address) {
719                 char *space = strchr(address, ' ');
720
721                 if(space) {
722                         *space++ = 0;
723                         port = space;
724                 }
725
726                 if(!strcmp(address, "*")) {
727                         *address = 0;
728                 }
729         }
730
731         struct addrinfo *ai, hint = {0};
732
733         hint.ai_family = addressfamily;
734
735         hint.ai_socktype = SOCK_STREAM;
736
737         hint.ai_protocol = IPPROTO_TCP;
738
739         hint.ai_flags = AI_PASSIVE;
740
741 #if HAVE_DECL_RES_INIT
742         res_init();
743
744 #endif
745         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
746
747         free(address);
748
749         if(err || !ai) {
750                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
751                 return false;
752         }
753
754         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
755                 // Ignore duplicate addresses
756                 bool found = false;
757
758                 for(int i = 0; i < listen_sockets; i++)
759                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
760                                 found = true;
761                                 break;
762                         }
763
764                 if(found) {
765                         continue;
766                 }
767
768                 if(listen_sockets >= MAXSOCKETS) {
769                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
770                         return false;
771                 }
772
773                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
774
775                 if(tcp_fd < 0) {
776                         continue;
777                 }
778
779                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
780
781                 if(udp_fd < 0) {
782                         close(tcp_fd);
783                         continue;
784                 }
785
786                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
787                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
788
789                 if(debug_level >= DEBUG_CONNECTIONS) {
790                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
791                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
792                         free(hostname);
793                 }
794
795                 listen_socket[listen_sockets].bindto = bindto;
796                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
797                 listen_sockets++;
798         }
799
800         freeaddrinfo(ai);
801         return true;
802 }
803
804 void device_enable(void) {
805         if(devops.enable) {
806                 devops.enable();
807         }
808
809         /* Run tinc-up script to further initialize the tap interface */
810
811         environment_t env;
812         environment_init(&env);
813         execute_script("tinc-up", &env);
814         environment_exit(&env);
815 }
816
817 void device_disable(void) {
818         environment_t env;
819         environment_init(&env);
820         execute_script("tinc-down", &env);
821         environment_exit(&env);
822
823         if(devops.disable) {
824                 devops.disable();
825         }
826 }
827
828 /*
829   Configure node_t myself and set up the local sockets (listen only)
830 */
831 static bool setup_myself(void) {
832         char *name, *hostname, *cipher, *digest, *type;
833         char *address = NULL;
834         bool port_specified = false;
835
836         if(!(name = get_name())) {
837                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
838                 return false;
839         }
840
841         myname = xstrdup(name);
842         myself = new_node();
843         myself->connection = new_connection();
844         myself->name = name;
845         myself->connection->name = xstrdup(name);
846         read_host_config(config_tree, name, true);
847
848         if(!get_config_string(lookup_config(config_tree, "Port"), &myport)) {
849                 myport = xstrdup("655");
850         } else {
851                 port_specified = true;
852         }
853
854         myself->connection->options = 0;
855         myself->connection->protocol_major = PROT_MAJOR;
856         myself->connection->protocol_minor = PROT_MINOR;
857
858         myself->options |= PROT_MINOR << 24;
859
860 #ifdef DISABLE_LEGACY
861         experimental = read_ecdsa_private_key();
862
863         if(!experimental) {
864                 logger(DEBUG_ALWAYS, LOG_ERR, "No private key available, cannot start tinc!");
865                 return false;
866         }
867
868 #else
869
870         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
871                 experimental = read_ecdsa_private_key();
872
873                 if(!experimental) {
874                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
875                 }
876         } else {
877                 if(experimental && !read_ecdsa_private_key()) {
878                         return false;
879                 }
880         }
881
882         if(!read_rsa_private_key()) {
883                 if(experimental) {
884                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for legacy protocol disabled.");
885                 } else {
886                         logger(DEBUG_ALWAYS, LOG_ERR, "No private keys available, cannot start tinc!");
887                         return false;
888                 }
889         }
890
891 #endif
892
893         /* Ensure myport is numeric */
894
895         if(!atoi(myport)) {
896                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
897                 sockaddr_t sa;
898
899                 if(!ai || !ai->ai_addr) {
900                         return false;
901                 }
902
903                 free(myport);
904                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
905                 freeaddrinfo(ai);
906                 sockaddr2str(&sa, NULL, &myport);
907         }
908
909         /* Read in all the subnets specified in the host configuration file */
910
911         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
912                 subnet_t *subnet;
913
914                 if(!get_config_subnet(cfg, &subnet)) {
915                         return false;
916                 }
917
918                 subnet_add(myself, subnet);
919         }
920
921         /* Check some options */
922
923         if(!setup_myself_reloadable()) {
924                 return false;
925         }
926
927         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
928         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
929         strictsubnets |= tunnelserver;
930
931         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
932                 if(max_connection_burst <= 0) {
933                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
934                         return false;
935                 }
936         }
937
938         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
939                 if(udp_rcvbuf < 0) {
940                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
941                         return false;
942                 }
943         }
944
945         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
946                 if(udp_sndbuf < 0) {
947                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
948                         return false;
949                 }
950         }
951
952         int replaywin_int;
953
954         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
955                 if(replaywin_int < 0) {
956                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
957                         return false;
958                 }
959
960                 replaywin = (unsigned)replaywin_int;
961                 sptps_replaywin = replaywin;
962         }
963
964 #ifndef DISABLE_LEGACY
965         /* Generate packet encryption key */
966
967         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher)) {
968                 cipher = xstrdup("aes-256-cbc");
969         }
970
971         if(!strcasecmp(cipher, "none")) {
972                 myself->incipher = NULL;
973         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
974                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
975                 return false;
976         }
977
978         free(cipher);
979
980         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval) {
981                 keylifetime, rand() % 100000
982         });
983
984         /* Check if we want to use message authentication codes... */
985
986         int maclength = 4;
987         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
988
989         if(maclength < 0) {
990                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
991                 return false;
992         }
993
994         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest)) {
995                 digest = xstrdup("sha256");
996         }
997
998         if(!strcasecmp(digest, "none")) {
999                 myself->indigest = NULL;
1000         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
1001                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
1002                 return false;
1003         }
1004
1005         free(digest);
1006 #endif
1007
1008         /* Compression */
1009
1010         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
1011                 if(myself->incompression < 0 || myself->incompression > 11) {
1012                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
1013                         return false;
1014                 }
1015         } else {
1016                 myself->incompression = 0;
1017         }
1018
1019         myself->connection->outcompression = 0;
1020
1021         /* Done */
1022
1023         myself->nexthop = myself;
1024         myself->via = myself;
1025         myself->status.reachable = true;
1026         myself->last_state_change = now.tv_sec;
1027         myself->status.sptps = experimental;
1028         node_add(myself);
1029
1030         graph();
1031
1032         load_all_nodes();
1033
1034         /* Open device */
1035
1036         devops = os_devops;
1037
1038         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
1039                 if(!strcasecmp(type, "dummy")) {
1040                         devops = dummy_devops;
1041                 } else if(!strcasecmp(type, "raw_socket")) {
1042                         devops = raw_socket_devops;
1043                 } else if(!strcasecmp(type, "multicast")) {
1044                         devops = multicast_devops;
1045                 } else if(!strcasecmp(type, "fd")) {
1046                         devops = fd_devops;
1047                 }
1048
1049 #ifdef ENABLE_UML
1050                 else if(!strcasecmp(type, "uml")) {
1051                         devops = uml_devops;
1052                 }
1053
1054 #endif
1055 #ifdef ENABLE_VDE
1056                 else if(!strcasecmp(type, "vde")) {
1057                         devops = vde_devops;
1058                 }
1059
1060 #endif
1061                 free(type);
1062         }
1063
1064         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
1065
1066         if(!devops.setup()) {
1067                 return false;
1068         }
1069
1070         if(device_fd >= 0) {
1071                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
1072         }
1073
1074         /* Open sockets */
1075
1076         if(!do_detach && getenv("LISTEN_FDS")) {
1077                 sockaddr_t sa;
1078                 socklen_t salen;
1079
1080                 listen_sockets = atoi(getenv("LISTEN_FDS"));
1081 #ifdef HAVE_UNSETENV
1082                 unsetenv("LISTEN_FDS");
1083 #endif
1084
1085                 if(listen_sockets > MAXSOCKETS) {
1086                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
1087                         return false;
1088                 }
1089
1090                 for(int i = 0; i < listen_sockets; i++) {
1091                         salen = sizeof(sa);
1092
1093                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
1094                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
1095                                 return false;
1096                         }
1097
1098 #ifdef FD_CLOEXEC
1099                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
1100 #endif
1101
1102                         int udp_fd = setup_vpn_in_socket(&sa);
1103
1104                         if(udp_fd < 0) {
1105                                 return false;
1106                         }
1107
1108                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
1109                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
1110
1111                         if(debug_level >= DEBUG_CONNECTIONS) {
1112                                 hostname = sockaddr2hostname(&sa);
1113                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
1114                                 free(hostname);
1115                         }
1116
1117                         memcpy(&listen_socket[i].sa, &sa, salen);
1118                 }
1119         } else {
1120                 listen_sockets = 0;
1121                 int cfgs = 0;
1122
1123                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1124                         cfgs++;
1125                         get_config_string(cfg, &address);
1126
1127                         if(!add_listen_address(address, true)) {
1128                                 return false;
1129                         }
1130                 }
1131
1132                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1133                         cfgs++;
1134                         get_config_string(cfg, &address);
1135
1136                         if(!add_listen_address(address, false)) {
1137                                 return false;
1138                         }
1139                 }
1140
1141                 if(!cfgs)
1142                         if(!add_listen_address(address, NULL)) {
1143                                 return false;
1144                         }
1145         }
1146
1147         if(!listen_sockets) {
1148                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1149                 return false;
1150         }
1151
1152         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1153
1154         if(!port_specified || atoi(myport) == 0) {
1155                 sockaddr_t sa;
1156                 socklen_t salen = sizeof(sa);
1157
1158                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1159                         free(myport);
1160                         sockaddr2str(&sa, NULL, &myport);
1161
1162                         if(!myport) {
1163                                 myport = xstrdup("655");
1164                         }
1165                 }
1166         }
1167
1168         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1169         myself->connection->hostname = xstrdup(myself->hostname);
1170
1171         char *upnp = NULL;
1172         get_config_string(lookup_config(config_tree, "UPnP"), &upnp);
1173         bool upnp_tcp = false;
1174         bool upnp_udp = false;
1175
1176         if(upnp) {
1177                 if(!strcasecmp(upnp, "yes")) {
1178                         upnp_tcp = upnp_udp = true;
1179                 } else if(!strcasecmp(upnp, "udponly")) {
1180                         upnp_udp = true;
1181                 }
1182
1183                 free(upnp);
1184         }
1185
1186         if(upnp_tcp || upnp_udp) {
1187 #ifdef HAVE_MINIUPNPC
1188                 upnp_init(upnp_tcp, upnp_udp);
1189 #else
1190                 logger(DEBUG_ALWAYS, LOG_WARNING, "UPnP was requested, but tinc isn't built with miniupnpc support!");
1191 #endif
1192         }
1193
1194         /* Done. */
1195
1196         last_config_check = now.tv_sec;
1197
1198         return true;
1199 }
1200
1201 /*
1202   initialize network
1203 */
1204 bool setup_network(void) {
1205         init_connections();
1206         init_subnets();
1207         init_nodes();
1208         init_edges();
1209         init_requests();
1210
1211         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1212                 if(pinginterval < 1) {
1213                         pinginterval = 86400;
1214                 }
1215         } else {
1216                 pinginterval = 60;
1217         }
1218
1219         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout)) {
1220                 pingtimeout = 5;
1221         }
1222
1223         if(pingtimeout < 1 || pingtimeout > pinginterval) {
1224                 pingtimeout = pinginterval;
1225         }
1226
1227         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize)) {
1228                 maxoutbufsize = 10 * MTU;
1229         }
1230
1231         if(!setup_myself()) {
1232                 return false;
1233         }
1234
1235         if(!init_control()) {
1236                 return false;
1237         }
1238
1239         if(!device_standby) {
1240                 device_enable();
1241         }
1242
1243         /* Run subnet-up scripts for our own subnets */
1244
1245         subnet_update(myself, NULL, true);
1246
1247         return true;
1248 }
1249
1250 /*
1251   close all open network connections
1252 */
1253 void close_network_connections(void) {
1254         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1255                 next = node->next;
1256                 connection_t *c = node->data;
1257
1258                 /* Keep control connections open until the end, so they know when we really terminated */
1259                 if(c->status.control) {
1260                         c->socket = -1;
1261                 }
1262
1263                 c->outgoing = NULL;
1264                 terminate_connection(c, false);
1265         }
1266
1267         if(outgoing_list) {
1268                 list_delete_list(outgoing_list);
1269         }
1270
1271         if(myself && myself->connection) {
1272                 subnet_update(myself, NULL, false);
1273                 connection_del(myself->connection);
1274         }
1275
1276         for(int i = 0; i < listen_sockets; i++) {
1277                 io_del(&listen_socket[i].tcp);
1278                 io_del(&listen_socket[i].udp);
1279                 close(listen_socket[i].tcp.fd);
1280                 close(listen_socket[i].udp.fd);
1281         }
1282
1283         exit_requests();
1284         exit_edges();
1285         exit_subnets();
1286         exit_nodes();
1287         exit_connections();
1288
1289         if(!device_standby) {
1290                 device_disable();
1291         }
1292
1293         free(myport);
1294
1295         if(device_fd >= 0) {
1296                 io_del(&device_io);
1297         }
1298
1299         if(devops.close) {
1300                 devops.close();
1301         }
1302
1303         exit_control();
1304
1305         free(scriptextension);
1306         free(scriptinterpreter);
1307
1308         return;
1309 }