Merge branch 'ctrl' of https://github.com/dechamps/tinc into 1.1
[tinc] / src / net_setup.c
1 /*
2     net_setup.c -- Setup.
3     Copyright (C) 1998-2005 Ivo Timmermans,
4                   2000-2014 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 char *myport;
47 static io_t device_io;
48 devops_t devops;
49 bool device_standby = false;
50
51 char *proxyhost;
52 char *proxyport;
53 char *proxyuser;
54 char *proxypass;
55 proxytype_t proxytype;
56 bool autoconnect;
57 bool disablebuggypeers;
58
59 char *scriptinterpreter;
60 char *scriptextension;
61
62 bool node_read_ecdsa_public_key(node_t *n) {
63         if(ecdsa_active(n->ecdsa))
64                 return true;
65
66         splay_tree_t *config_tree;
67         FILE *fp;
68         char *pubname = NULL;
69         char *p;
70
71         init_configuration(&config_tree);
72         if(!read_host_config(config_tree, n->name))
73                 goto exit;
74
75         /* First, check for simple Ed25519PublicKey statement */
76
77         if(get_config_string(lookup_config(config_tree, "Ed25519PublicKey"), &p)) {
78                 n->ecdsa = ecdsa_set_base64_public_key(p);
79                 free(p);
80                 goto exit;
81         }
82
83         /* Else, check for Ed25519PublicKeyFile statement and read it */
84
85         if(!get_config_string(lookup_config(config_tree, "Ed25519PublicKeyFile"), &pubname))
86                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
87
88         fp = fopen(pubname, "r");
89
90         if(!fp)
91                 goto exit;
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 Ed25519PublicKey statement */
117
118         if(get_config_string(lookup_config(c->config_tree, "Ed25519PublicKey"), &p)) {
119                 c->ecdsa = ecdsa_set_base64_public_key(p);
120                 free(p);
121                 return c->ecdsa;
122         }
123
124         /* Else, check for Ed25519PublicKeyFile statement and read it */
125
126         if(!get_config_string(lookup_config(c->config_tree, "Ed25519PublicKeyFile"), &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 Ed25519 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 Ed25519 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, "Ed25519PrivateKeyFile"), &fname))
192                 xasprintf(&fname, "%s" SLASH "ed25519_key.priv", confbase);
193
194         fp = fopen(fname, "r");
195
196         if(!fp) {
197                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 private key file `%s': %s", fname, strerror(errno));
198                 if(errno == ENOENT)
199                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an Ed25519 keypair with `tinc -n %s generate-ed25519-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 Ed25519 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 Ed25519 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 Ed25519 private key file `%s' failed", fname);
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 "ed25519_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 Ed25519 private key file `%s' failed", fname);
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                 char hostname[32] = "";
414                 if(!envname) {
415                         if(strcmp(name + 1, "HOST")) {
416                                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1);
417                                 return false;
418                         }
419                         if(gethostname(hostname, sizeof hostname) || !*hostname) {
420                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", sockstrerror(sockerrno));
421                                 return false;
422                         }
423                         hostname[31] = 0;
424                         envname = hostname;
425                 }
426                 free(name);
427                 name = xstrdup(envname);
428                 for(char *c = name; *c; c++)
429                         if(!isalnum(*c))
430                                 *c = '_';
431         }
432
433         if(!check_id(name)) {
434                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
435                 free(name);
436                 return false;
437         }
438
439         return name;
440 }
441
442 bool setup_myself_reloadable(void) {
443         char *proxy = NULL;
444         char *rmode = NULL;
445         char *fmode = NULL;
446         char *bmode = NULL;
447         char *afname = NULL;
448         char *space;
449         bool choice;
450
451         free(scriptinterpreter);
452         scriptinterpreter = NULL;
453         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
454
455
456         free(scriptextension);
457         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
458                 scriptextension = xstrdup("");
459
460         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
461         if(proxy) {
462                 if((space = strchr(proxy, ' ')))
463                         *space++ = 0;
464
465                 if(!strcasecmp(proxy, "none")) {
466                         proxytype = PROXY_NONE;
467                 } else if(!strcasecmp(proxy, "socks4")) {
468                         proxytype = PROXY_SOCKS4;
469                 } else if(!strcasecmp(proxy, "socks4a")) {
470                         proxytype = PROXY_SOCKS4A;
471                 } else if(!strcasecmp(proxy, "socks5")) {
472                         proxytype = PROXY_SOCKS5;
473                 } else if(!strcasecmp(proxy, "http")) {
474                         proxytype = PROXY_HTTP;
475                 } else if(!strcasecmp(proxy, "exec")) {
476                         proxytype = PROXY_EXEC;
477                 } else {
478                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
479                         return false;
480                 }
481
482                 switch(proxytype) {
483                         case PROXY_NONE:
484                         default:
485                                 break;
486
487                         case PROXY_EXEC:
488                                 if(!space || !*space) {
489                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
490                                         return false;
491                                 }
492                                 proxyhost =  xstrdup(space);
493                                 break;
494
495                         case PROXY_SOCKS4:
496                         case PROXY_SOCKS4A:
497                         case PROXY_SOCKS5:
498                         case PROXY_HTTP:
499                                 proxyhost = space;
500                                 if(space && (space = strchr(space, ' ')))
501                                         *space++ = 0, proxyport = space;
502                                 if(space && (space = strchr(space, ' ')))
503                                         *space++ = 0, proxyuser = space;
504                                 if(space && (space = strchr(space, ' ')))
505                                         *space++ = 0, proxypass = space;
506                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
507                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
508                                         return false;
509                                 }
510                                 proxyhost = xstrdup(proxyhost);
511                                 proxyport = xstrdup(proxyport);
512                                 if(proxyuser && *proxyuser)
513                                         proxyuser = xstrdup(proxyuser);
514                                 if(proxypass && *proxypass)
515                                         proxypass = xstrdup(proxypass);
516                                 break;
517                 }
518
519                 free(proxy);
520         }
521
522         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
523                 myself->options |= OPTION_INDIRECT;
524
525         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
526                 myself->options |= OPTION_TCPONLY;
527
528         if(myself->options & OPTION_TCPONLY)
529                 myself->options |= OPTION_INDIRECT;
530
531         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
532         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
533
534         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
535                 if(!strcasecmp(rmode, "router"))
536                         routing_mode = RMODE_ROUTER;
537                 else if(!strcasecmp(rmode, "switch"))
538                         routing_mode = RMODE_SWITCH;
539                 else if(!strcasecmp(rmode, "hub"))
540                         routing_mode = RMODE_HUB;
541                 else {
542                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
543                         return false;
544                 }
545                 free(rmode);
546         }
547
548         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
549                 if(!strcasecmp(fmode, "off"))
550                         forwarding_mode = FMODE_OFF;
551                 else if(!strcasecmp(fmode, "internal"))
552                         forwarding_mode = FMODE_INTERNAL;
553                 else if(!strcasecmp(fmode, "kernel"))
554                         forwarding_mode = FMODE_KERNEL;
555                 else {
556                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
557                         return false;
558                 }
559                 free(fmode);
560         }
561
562         choice = true;
563         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
564         if(choice)
565                 myself->options |= OPTION_PMTU_DISCOVERY;
566
567         choice = true;
568         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
569         if(choice)
570                 myself->options |= OPTION_CLAMP_MSS;
571
572         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
573         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
574         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
575                 if(!strcasecmp(bmode, "no"))
576                         broadcast_mode = BMODE_NONE;
577                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
578                         broadcast_mode = BMODE_MST;
579                 else if(!strcasecmp(bmode, "direct"))
580                         broadcast_mode = BMODE_DIRECT;
581                 else {
582                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
583                         return false;
584                 }
585                 free(bmode);
586         }
587
588         const char* const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
589         for (size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
590                 subnet_t *s = new_subnet();
591                 if (!str2net(s, DEFAULT_BROADCAST_SUBNETS[i]))
592                         abort();
593                 subnet_add(NULL, s);
594         }
595         for (config_t* cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
596                 subnet_t *s;
597                 if (!get_config_subnet(cfg, &s))
598                         continue;
599                 subnet_add(NULL, s);
600         }
601
602 #if !defined(SOL_IP) || !defined(IP_TOS)
603         if(priorityinheritance)
604                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
605 #endif
606
607         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
608                 macexpire = 600;
609
610         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
611                 if(maxtimeout <= 0) {
612                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
613                         return false;
614                 }
615         } else
616                 maxtimeout = 900;
617
618         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
619                 if(!strcasecmp(afname, "IPv4"))
620                         addressfamily = AF_INET;
621                 else if(!strcasecmp(afname, "IPv6"))
622                         addressfamily = AF_INET6;
623                 else if(!strcasecmp(afname, "any"))
624                         addressfamily = AF_UNSPEC;
625                 else {
626                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
627                         return false;
628                 }
629                 free(afname);
630         }
631
632         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
633
634         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
635                 keylifetime = 3600;
636
637         config_t *cfg = lookup_config(config_tree, "AutoConnect");
638         if(cfg) {
639                 if(!get_config_bool(cfg, &autoconnect)) {
640                         // Some backwards compatibility with when this option was an int
641                         int val = 0;
642                         get_config_int(cfg, &val);
643                         autoconnect = val;
644                 }
645         }
646
647         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
648
649         read_invitation_key();
650
651         return true;
652 }
653
654 /*
655   Add listening sockets.
656 */
657 static bool add_listen_address(char *address, bool bindto) {
658         char *port = myport;
659
660         if(address) {
661                 char *space = strchr(address, ' ');
662                 if(space) {
663                         *space++ = 0;
664                         port = space;
665                 }
666
667                 if(!strcmp(address, "*"))
668                         *address = 0;
669         }
670
671         struct addrinfo *ai, hint = {0};
672         hint.ai_family = addressfamily;
673         hint.ai_socktype = SOCK_STREAM;
674         hint.ai_protocol = IPPROTO_TCP;
675         hint.ai_flags = AI_PASSIVE;
676
677         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
678         free(address);
679
680         if(err || !ai) {
681                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
682                 return false;
683         }
684
685         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
686                 // Ignore duplicate addresses
687                 bool found = false;
688
689                 for(int i = 0; i < listen_sockets; i++)
690                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
691                                 found = true;
692                                 break;
693                         }
694
695                 if(found)
696                         continue;
697
698                 if(listen_sockets >= MAXSOCKETS) {
699                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
700                         return false;
701                 }
702
703                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
704
705                 if(tcp_fd < 0)
706                         continue;
707
708                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
709
710                 if(tcp_fd < 0) {
711                         close(tcp_fd);
712                         continue;
713                 }
714
715                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
716                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
717
718                 if(debug_level >= DEBUG_CONNECTIONS) {
719                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
720                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
721                         free(hostname);
722                 }
723
724                 listen_socket[listen_sockets].bindto = bindto;
725                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
726                 listen_sockets++;
727         }
728
729         freeaddrinfo(ai);
730         return true;
731 }
732
733 void device_enable(void) {
734         if (devops.enable)
735                 devops.enable();
736
737         /* Run tinc-up script to further initialize the tap interface */
738
739         char *envp[5] = {NULL};
740         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
741         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
742         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
743         xasprintf(&envp[3], "NAME=%s", myself->name);
744
745         execute_script("tinc-up", envp);
746
747         for(int i = 0; i < 4; i++)
748                 free(envp[i]);
749 }
750
751 void device_disable(void) {
752         char *envp[5] = {NULL};
753         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
754         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
755         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
756         xasprintf(&envp[3], "NAME=%s", myself->name);
757
758         execute_script("tinc-down", envp);
759
760         for(int i = 0; i < 4; i++)
761                 free(envp[i]);
762
763         if (devops.disable)
764                 devops.disable();
765 }
766
767 /*
768   Configure node_t myself and set up the local sockets (listen only)
769 */
770 static bool setup_myself(void) {
771         char *name, *hostname, *cipher, *digest, *type;
772         char *address = NULL;
773         bool port_specified = false;
774
775         if(!(name = get_name())) {
776                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
777                 return false;
778         }
779
780         myself = new_node();
781         myself->connection = new_connection();
782         myself->name = name;
783         myself->connection->name = xstrdup(name);
784         read_host_config(config_tree, name);
785
786         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
787                 myport = xstrdup("655");
788         else
789                 port_specified = true;
790
791         myself->connection->options = 0;
792         myself->connection->protocol_major = PROT_MAJOR;
793         myself->connection->protocol_minor = PROT_MINOR;
794
795         myself->options |= PROT_MINOR << 24;
796
797         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
798                 experimental = read_ecdsa_private_key();
799                 if(!experimental)
800                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
801         } else {
802                 if(experimental && !read_ecdsa_private_key())
803                         return false;
804         }
805
806         if(!read_rsa_private_key())
807                 return false;
808
809         /* Ensure myport is numeric */
810
811         if(!atoi(myport)) {
812                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
813                 sockaddr_t sa;
814                 if(!ai || !ai->ai_addr)
815                         return false;
816                 free(myport);
817                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
818                 sockaddr2str(&sa, NULL, &myport);
819         }
820
821         /* Read in all the subnets specified in the host configuration file */
822
823         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
824                 subnet_t *subnet;
825
826                 if(!get_config_subnet(cfg, &subnet))
827                         return false;
828
829                 subnet_add(myself, subnet);
830         }
831
832         /* Check some options */
833
834         if(!setup_myself_reloadable())
835                 return false;
836
837         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
838         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
839         strictsubnets |= tunnelserver;
840
841         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
842                 if(max_connection_burst <= 0) {
843                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
844                         return false;
845                 }
846         }
847
848         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
849                 if(udp_rcvbuf <= 0) {
850                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
851                         return false;
852                 }
853         }
854
855         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
856                 if(udp_sndbuf <= 0) {
857                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
858                         return false;
859                 }
860         }
861
862         int replaywin_int;
863         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
864                 if(replaywin_int < 0) {
865                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
866                         return false;
867                 }
868                 replaywin = (unsigned)replaywin_int;
869                 sptps_replaywin = replaywin;
870         }
871
872         /* Generate packet encryption key */
873
874         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
875                 cipher = xstrdup("blowfish");
876
877         if(!strcasecmp(cipher, "none")) {
878                 myself->incipher = NULL;
879         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
880                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
881                 return false;
882         }
883
884         free(cipher);
885
886         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
887
888         /* Check if we want to use message authentication codes... */
889
890         int maclength = 4;
891         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
892
893         if(maclength < 0) {
894                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
895                 return false;
896         }
897
898         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
899                 digest = xstrdup("sha1");
900
901         if(!strcasecmp(digest, "none")) {
902                 myself->indigest = NULL;
903         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
904                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
905                 return false;
906         }
907
908         free(digest);
909
910         /* Compression */
911
912         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
913                 if(myself->incompression < 0 || myself->incompression > 11) {
914                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
915                         return false;
916                 }
917         } else
918                 myself->incompression = 0;
919
920         myself->connection->outcompression = 0;
921
922         /* Done */
923
924         myself->nexthop = myself;
925         myself->via = myself;
926         myself->status.reachable = true;
927         myself->last_state_change = now.tv_sec;
928         myself->status.sptps = experimental;
929         node_add(myself);
930
931         graph();
932
933         if(strictsubnets)
934                 load_all_subnets();
935         else if(autoconnect)
936                 load_all_nodes();
937
938         /* Open device */
939
940         devops = os_devops;
941
942         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
943                 if(!strcasecmp(type, "dummy"))
944                         devops = dummy_devops;
945                 else if(!strcasecmp(type, "raw_socket"))
946                         devops = raw_socket_devops;
947                 else if(!strcasecmp(type, "multicast"))
948                         devops = multicast_devops;
949 #ifdef ENABLE_UML
950                 else if(!strcasecmp(type, "uml"))
951                         devops = uml_devops;
952 #endif
953 #ifdef ENABLE_VDE
954                 else if(!strcasecmp(type, "vde"))
955                         devops = vde_devops;
956 #endif
957         }
958
959         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
960
961         if(!devops.setup())
962                 return false;
963
964         if(device_fd >= 0)
965                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
966
967         /* Open sockets */
968
969         if(!do_detach && getenv("LISTEN_FDS")) {
970                 sockaddr_t sa;
971                 socklen_t salen;
972
973                 listen_sockets = atoi(getenv("LISTEN_FDS"));
974 #ifdef HAVE_UNSETENV
975                 unsetenv("LISTEN_FDS");
976 #endif
977
978                 if(listen_sockets > MAXSOCKETS) {
979                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
980                         return false;
981                 }
982
983                 for(int i = 0; i < listen_sockets; i++) {
984                         salen = sizeof sa;
985                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
986                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
987                                 return false;
988                         }
989
990 #ifdef FD_CLOEXEC
991                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
992 #endif
993
994                         int udp_fd = setup_vpn_in_socket(&sa);
995                         if(udp_fd < 0)
996                                 return false;
997
998                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
999                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
1000
1001                         if(debug_level >= DEBUG_CONNECTIONS) {
1002                                 hostname = sockaddr2hostname(&sa);
1003                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
1004                                 free(hostname);
1005                         }
1006
1007                         memcpy(&listen_socket[i].sa, &sa, salen);
1008                 }
1009         } else {
1010                 listen_sockets = 0;
1011                 int cfgs = 0;
1012
1013                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1014                         cfgs++;
1015                         get_config_string(cfg, &address);
1016                         if(!add_listen_address(address, true))
1017                                 return false;
1018                 }
1019
1020                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1021                         cfgs++;
1022                         get_config_string(cfg, &address);
1023                         if(!add_listen_address(address, false))
1024                                 return false;
1025                 }
1026
1027                 if(!cfgs)
1028                         if(!add_listen_address(address, NULL))
1029                                 return false;
1030         }
1031
1032         if(!listen_sockets) {
1033                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1034                 return false;
1035         }
1036
1037         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1038
1039         if(!port_specified || atoi(myport) == 0) {
1040                 sockaddr_t sa;
1041                 socklen_t salen = sizeof sa;
1042                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1043                         free(myport);
1044                         sockaddr2str(&sa, NULL, &myport);
1045                         if(!myport)
1046                                 myport = xstrdup("655");
1047                 }
1048         }
1049
1050         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1051         myself->connection->hostname = xstrdup(myself->hostname);
1052
1053         /* Done. */
1054
1055         last_config_check = now.tv_sec;
1056
1057         return true;
1058 }
1059
1060 /*
1061   initialize network
1062 */
1063 bool setup_network(void) {
1064         init_connections();
1065         init_subnets();
1066         init_nodes();
1067         init_edges();
1068         init_requests();
1069
1070         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1071                 if(pinginterval < 1) {
1072                         pinginterval = 86400;
1073                 }
1074         } else
1075                 pinginterval = 60;
1076
1077         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
1078                 pingtimeout = 5;
1079         if(pingtimeout < 1 || pingtimeout > pinginterval)
1080                 pingtimeout = pinginterval;
1081
1082         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
1083                 maxoutbufsize = 10 * MTU;
1084
1085         if(!setup_myself())
1086                 return false;
1087
1088         if(!init_control())
1089                 return false;
1090
1091         if (!device_standby)
1092                 device_enable();
1093
1094         /* Run subnet-up scripts for our own subnets */
1095
1096         subnet_update(myself, NULL, true);
1097
1098         return true;
1099 }
1100
1101 /*
1102   close all open network connections
1103 */
1104 void close_network_connections(void) {
1105         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1106                 next = node->next;
1107                 connection_t *c = node->data;
1108                 /* Keep control connections open until the end, so they know when we really terminated */
1109                 if(c->status.control)
1110                         c->socket = -1;
1111                 c->outgoing = NULL;
1112                 terminate_connection(c, false);
1113         }
1114
1115         if(outgoing_list)
1116                 list_delete_list(outgoing_list);
1117
1118         if(myself && myself->connection) {
1119                 subnet_update(myself, NULL, false);
1120                 terminate_connection(myself->connection, false);
1121                 free_connection(myself->connection);
1122         }
1123
1124         for(int i = 0; i < listen_sockets; i++) {
1125                 io_del(&listen_socket[i].tcp);
1126                 io_del(&listen_socket[i].udp);
1127                 close(listen_socket[i].tcp.fd);
1128                 close(listen_socket[i].udp.fd);
1129         }
1130
1131         exit_requests();
1132         exit_edges();
1133         exit_subnets();
1134         exit_nodes();
1135         exit_connections();
1136
1137         if (!device_standby)
1138                 device_disable();
1139
1140         if(myport) free(myport);
1141
1142         if (device_fd >= 0)
1143                 io_del(&device_io);
1144         devops.close();
1145
1146         exit_control();
1147
1148         return;
1149 }