tinc-vpn.org Git - tinc/blob - src/net_setup.c

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2015 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 char *myname;
  48 static io_t device_io;
  49 devops_t devops;
  50 bool device_standby = false;
  51
  52 char *proxyhost;
  53 char *proxyport;
  54 char *proxyuser;
  55 char *proxypass;
  56 proxytype_t proxytype;
  57 bool autoconnect;
  58 bool disablebuggypeers;
  59
  60 char *scriptinterpreter;
  61 char *scriptextension;
  62
  63 bool node_read_ecdsa_public_key(node_t *n) {
  64         if(ecdsa_active(n->ecdsa))
  65                 return true;
  66
  67         splay_tree_t *config_tree;
  68         FILE *fp;
  69         char *pubname = NULL;
  70         char *p;
  71
  72         init_configuration(&config_tree);
  73         if(!read_host_config(config_tree, n->name))
  74                 goto exit;
  75
  76         /* First, check for simple Ed25519PublicKey statement */
  77
  78         if(get_config_string(lookup_config(config_tree, "Ed25519PublicKey"), &p)) {
  79                 n->ecdsa = ecdsa_set_base64_public_key(p);
  80                 free(p);
  81                 goto exit;
  82         }
  83
  84         /* Else, check for Ed25519PublicKeyFile statement and read it */
  85
  86         if(!get_config_string(lookup_config(config_tree, "Ed25519PublicKeyFile"), &pubname))
  87                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  88
  89         fp = fopen(pubname, "r");
  90
  91         if(!fp)
  92                 goto exit;
  93
  94         n->ecdsa = ecdsa_read_pem_public_key(fp);
  95         fclose(fp);
  96
  97 exit:
  98         exit_configuration(&config_tree);
  99         free(pubname);
 100         return n->ecdsa;
 101 }
 102
 103 bool read_ecdsa_public_key(connection_t *c) {
 104         if(ecdsa_active(c->ecdsa))
 105                 return true;
 106
 107         FILE *fp;
 108         char *fname;
 109         char *p;
 110
 111         if(!c->config_tree) {
 112                 init_configuration(&c->config_tree);
 113                 if(!read_host_config(c->config_tree, c->name))
 114                         return false;
 115         }
 116
 117         /* First, check for simple Ed25519PublicKey statement */
 118
 119         if(get_config_string(lookup_config(c->config_tree, "Ed25519PublicKey"), &p)) {
 120                 c->ecdsa = ecdsa_set_base64_public_key(p);
 121                 free(p);
 122                 return c->ecdsa;
 123         }
 124
 125         /* Else, check for Ed25519PublicKeyFile statement and read it */
 126
 127         if(!get_config_string(lookup_config(c->config_tree, "Ed25519PublicKeyFile"), &fname))
 128                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 129
 130         fp = fopen(fname, "r");
 131
 132         if(!fp) {
 133                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 public key file `%s': %s",
 134                            fname, strerror(errno));
 135                 free(fname);
 136                 return false;
 137         }
 138
 139         c->ecdsa = ecdsa_read_pem_public_key(fp);
 140
 141         if(!c->ecdsa && errno != ENOENT)
 142                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing Ed25519 public key file `%s' failed.", fname);
 143
 144         fclose(fp);
 145         free(fname);
 146         return c->ecdsa;
 147 }
 148
 149 #ifndef DISABLE_LEGACY
 150 bool read_rsa_public_key(connection_t *c) {
 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 #endif
 185
 186 static bool read_ecdsa_private_key(void) {
 187         FILE *fp;
 188         char *fname;
 189
 190         /* Check for PrivateKeyFile statement and read it */
 191
 192         if(!get_config_string(lookup_config(config_tree, "Ed25519PrivateKeyFile"), &fname))
 193                 xasprintf(&fname, "%s" SLASH "ed25519_key.priv", confbase);
 194
 195         fp = fopen(fname, "r");
 196
 197         if(!fp) {
 198                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 private key file `%s': %s", fname, strerror(errno));
 199                 if(errno == ENOENT)
 200                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an Ed25519 keypair with `tinc -n %s generate-ed25519-keys'.", netname ?: ".");
 201                 free(fname);
 202                 return false;
 203         }
 204
 205 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 206         struct stat s;
 207
 208         if(fstat(fileno(fp), &s)) {
 209                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat Ed25519 private key file `%s': %s'", fname, strerror(errno));
 210                 free(fname);
 211                 return false;
 212         }
 213
 214         if(s.st_mode & ~0100700)
 215                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for Ed25519 private key file `%s'!", fname);
 216 #endif
 217
 218         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 219         fclose(fp);
 220
 221         if(!myself->connection->ecdsa)
 222                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 223         free(fname);
 224         return myself->connection->ecdsa;
 225 }
 226
 227 static bool read_invitation_key(void) {
 228         FILE *fp;
 229         char fname[PATH_MAX];
 230
 231         if(invitation_key) {
 232                 ecdsa_free(invitation_key);
 233                 invitation_key = NULL;
 234         }
 235
 236         snprintf(fname, sizeof fname, "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
 237
 238         fp = fopen(fname, "r");
 239
 240         if(fp) {
 241                 invitation_key = ecdsa_read_pem_private_key(fp);
 242                 fclose(fp);
 243                 if(!invitation_key)
 244                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 245         }
 246
 247         return invitation_key;
 248 }
 249
 250 #ifndef DISABLE_LEGACY
 251 static bool read_rsa_private_key(void) {
 252         FILE *fp;
 253         char *fname;
 254         char *n, *d;
 255
 256         /* First, check for simple PrivateKey statement */
 257
 258         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 259                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 260                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 261                         free(d);
 262                         return false;
 263                 }
 264                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 265                 free(n);
 266                 free(d);
 267                 return myself->connection->rsa;
 268         }
 269
 270         /* Else, check for PrivateKeyFile statement and read it */
 271
 272         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 273                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 274
 275         fp = fopen(fname, "r");
 276
 277         if(!fp) {
 278                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 279                            fname, strerror(errno));
 280                 if(errno == ENOENT)
 281                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an RSA keypair with `tinc -n %s generate-rsa-keys'.", netname ?: ".");
 282                 free(fname);
 283                 return false;
 284         }
 285
 286 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 287         struct stat s;
 288
 289         if(fstat(fileno(fp), &s)) {
 290                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 291                 free(fname);
 292                 return false;
 293         }
 294
 295         if(s.st_mode & ~0100700)
 296                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 297 #endif
 298
 299         myself->connection->rsa = rsa_read_pem_private_key(fp);
 300         fclose(fp);
 301
 302         if(!myself->connection->rsa)
 303                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 304         free(fname);
 305         return myself->connection->rsa;
 306 }
 307 #endif
 308
 309 static timeout_t keyexpire_timeout;
 310
 311 static void keyexpire_handler(void *data) {
 312         regenerate_key();
 313         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 314 }
 315
 316 void regenerate_key(void) {
 317         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 318         send_key_changed();
 319         for splay_each(node_t, n, node_tree)
 320                 n->status.validkey_in = false;
 321 }
 322
 323 /*
 324   Read Subnets from all host config files
 325 */
 326 void load_all_subnets(void) {
 327         DIR *dir;
 328         struct dirent *ent;
 329         char dname[PATH_MAX];
 330
 331         snprintf(dname, sizeof dname, "%s" SLASH "hosts", confbase);
 332         dir = opendir(dname);
 333         if(!dir) {
 334                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 335                 return;
 336         }
 337
 338         while((ent = readdir(dir))) {
 339                 if(!check_id(ent->d_name))
 340                         continue;
 341
 342                 node_t *n = lookup_node(ent->d_name);
 343                 #ifdef _DIRENT_HAVE_D_TYPE
 344                 //if(ent->d_type != DT_REG)
 345                 //      continue;
 346                 #endif
 347
 348                 splay_tree_t *config_tree;
 349                 init_configuration(&config_tree);
 350                 read_config_options(config_tree, ent->d_name);
 351                 read_host_config(config_tree, ent->d_name);
 352
 353                 if(!n) {
 354                         n = new_node();
 355                         n->name = xstrdup(ent->d_name);
 356                         node_add(n);
 357                 }
 358
 359                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 360                         subnet_t *s, *s2;
 361
 362                         if(!get_config_subnet(cfg, &s))
 363                                 continue;
 364
 365                         if((s2 = lookup_subnet(n, s))) {
 366                                 s2->expires = -1;
 367                                 free(s);
 368                         } else {
 369                                 subnet_add(n, s);
 370                         }
 371                 }
 372
 373                 exit_configuration(&config_tree);
 374         }
 375
 376         closedir(dir);
 377 }
 378
 379 void load_all_nodes(void) {
 380         DIR *dir;
 381         struct dirent *ent;
 382         char dname[PATH_MAX];
 383
 384         snprintf(dname, sizeof dname, "%s" SLASH "hosts", confbase);
 385         dir = opendir(dname);
 386         if(!dir) {
 387                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 388                 return;
 389         }
 390
 391         while((ent = readdir(dir))) {
 392                 if(!check_id(ent->d_name))
 393                         continue;
 394
 395                 node_t *n = lookup_node(ent->d_name);
 396                 if(n)
 397                         continue;
 398
 399                 n = new_node();
 400                 n->name = xstrdup(ent->d_name);
 401                 node_add(n);
 402         }
 403
 404         closedir(dir);
 405 }
 406
 407
 408 char *get_name(void) {
 409         char *name = NULL;
 410         char *returned_name;
 411
 412         get_config_string(lookup_config(config_tree, "Name"), &name);
 413
 414         if(!name)
 415                 return NULL;
 416
 417         returned_name = replace_name(name);
 418         free(name);
 419         return returned_name;
 420 }
 421
 422 bool setup_myself_reloadable(void) {
 423         char *proxy = NULL;
 424         char *rmode = NULL;
 425         char *fmode = NULL;
 426         char *bmode = NULL;
 427         char *afname = NULL;
 428         char *space;
 429         bool choice;
 430
 431         free(scriptinterpreter);
 432         scriptinterpreter = NULL;
 433         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 434
 435
 436         free(scriptextension);
 437         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 438                 scriptextension = xstrdup("");
 439
 440         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 441         if(proxy) {
 442                 if((space = strchr(proxy, ' ')))
 443                         *space++ = 0;
 444
 445                 if(!strcasecmp(proxy, "none")) {
 446                         proxytype = PROXY_NONE;
 447                 } else if(!strcasecmp(proxy, "socks4")) {
 448                         proxytype = PROXY_SOCKS4;
 449                 } else if(!strcasecmp(proxy, "socks4a")) {
 450                         proxytype = PROXY_SOCKS4A;
 451                 } else if(!strcasecmp(proxy, "socks5")) {
 452                         proxytype = PROXY_SOCKS5;
 453                 } else if(!strcasecmp(proxy, "http")) {
 454                         proxytype = PROXY_HTTP;
 455                 } else if(!strcasecmp(proxy, "exec")) {
 456                         proxytype = PROXY_EXEC;
 457                 } else {
 458                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 459                         return false;
 460                 }
 461
 462                 switch(proxytype) {
 463                         case PROXY_NONE:
 464                         default:
 465                                 break;
 466
 467                         case PROXY_EXEC:
 468                                 if(!space || !*space) {
 469                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 470                                         return false;
 471                                 }
 472                                 proxyhost =  xstrdup(space);
 473                                 break;
 474
 475                         case PROXY_SOCKS4:
 476                         case PROXY_SOCKS4A:
 477                         case PROXY_SOCKS5:
 478                         case PROXY_HTTP:
 479                                 proxyhost = space;
 480                                 if(space && (space = strchr(space, ' ')))
 481                                         *space++ = 0, proxyport = space;
 482                                 if(space && (space = strchr(space, ' ')))
 483                                         *space++ = 0, proxyuser = space;
 484                                 if(space && (space = strchr(space, ' ')))
 485                                         *space++ = 0, proxypass = space;
 486                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 487                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 488                                         return false;
 489                                 }
 490                                 proxyhost = xstrdup(proxyhost);
 491                                 proxyport = xstrdup(proxyport);
 492                                 if(proxyuser && *proxyuser)
 493                                         proxyuser = xstrdup(proxyuser);
 494                                 if(proxypass && *proxypass)
 495                                         proxypass = xstrdup(proxypass);
 496                                 break;
 497                 }
 498
 499                 free(proxy);
 500         }
 501
 502         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 503                 myself->options |= OPTION_INDIRECT;
 504
 505         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 506                 myself->options |= OPTION_TCPONLY;
 507
 508         if(myself->options & OPTION_TCPONLY)
 509                 myself->options |= OPTION_INDIRECT;
 510
 511         get_config_bool(lookup_config(config_tree, "UDPDiscovery"), &udp_discovery);
 512         get_config_int(lookup_config(config_tree, "UDPDiscoveryKeepaliveInterval"), &udp_discovery_keepalive_interval);
 513         get_config_int(lookup_config(config_tree, "UDPDiscoveryInterval"), &udp_discovery_interval);
 514         get_config_int(lookup_config(config_tree, "UDPDiscoveryTimeout"), &udp_discovery_timeout);
 515
 516         get_config_int(lookup_config(config_tree, "MTUInfoInterval"), &mtu_info_interval);
 517         get_config_int(lookup_config(config_tree, "UDPInfoInterval"), &udp_info_interval);
 518
 519         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 520         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 521
 522         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 523                 if(!strcasecmp(rmode, "router"))
 524                         routing_mode = RMODE_ROUTER;
 525                 else if(!strcasecmp(rmode, "switch"))
 526                         routing_mode = RMODE_SWITCH;
 527                 else if(!strcasecmp(rmode, "hub"))
 528                         routing_mode = RMODE_HUB;
 529                 else {
 530                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 531                         return false;
 532                 }
 533                 free(rmode);
 534         }
 535
 536         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 537                 if(!strcasecmp(fmode, "off"))
 538                         forwarding_mode = FMODE_OFF;
 539                 else if(!strcasecmp(fmode, "internal"))
 540                         forwarding_mode = FMODE_INTERNAL;
 541                 else if(!strcasecmp(fmode, "kernel"))
 542                         forwarding_mode = FMODE_KERNEL;
 543                 else {
 544                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 545                         return false;
 546                 }
 547                 free(fmode);
 548         }
 549
 550         choice = true;
 551         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 552         if(choice)
 553                 myself->options |= OPTION_PMTU_DISCOVERY;
 554
 555         choice = true;
 556         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 557         if(choice)
 558                 myself->options |= OPTION_CLAMP_MSS;
 559
 560         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 561         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 562         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 563                 if(!strcasecmp(bmode, "no"))
 564                         broadcast_mode = BMODE_NONE;
 565                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 566                         broadcast_mode = BMODE_MST;
 567                 else if(!strcasecmp(bmode, "direct"))
 568                         broadcast_mode = BMODE_DIRECT;
 569                 else {
 570                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 571                         return false;
 572                 }
 573                 free(bmode);
 574         }
 575
 576         const char* const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
 577         for (size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
 578                 subnet_t *s = new_subnet();
 579                 if (!str2net(s, DEFAULT_BROADCAST_SUBNETS[i]))
 580                         abort();
 581                 subnet_add(NULL, s);
 582         }
 583         for (config_t* cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 584                 subnet_t *s;
 585                 if (!get_config_subnet(cfg, &s))
 586                         continue;
 587                 subnet_add(NULL, s);
 588         }
 589
 590 #if !defined(SOL_IP) || !defined(IP_TOS)
 591         if(priorityinheritance)
 592                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 593 #endif
 594
 595         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 596                 macexpire = 600;
 597
 598         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 599                 if(maxtimeout <= 0) {
 600                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 601                         return false;
 602                 }
 603         } else
 604                 maxtimeout = 900;
 605
 606         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 607                 if(!strcasecmp(afname, "IPv4"))
 608                         addressfamily = AF_INET;
 609                 else if(!strcasecmp(afname, "IPv6"))
 610                         addressfamily = AF_INET6;
 611                 else if(!strcasecmp(afname, "any"))
 612                         addressfamily = AF_UNSPEC;
 613                 else {
 614                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 615                         return false;
 616                 }
 617                 free(afname);
 618         }
 619
 620         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 621
 622         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 623                 keylifetime = 3600;
 624
 625         config_t *cfg = lookup_config(config_tree, "AutoConnect");
 626         if(cfg) {
 627                 if(!get_config_bool(cfg, &autoconnect)) {
 628                         // Some backwards compatibility with when this option was an int
 629                         int val = 0;
 630                         get_config_int(cfg, &val);
 631                         autoconnect = val;
 632                 }
 633         }
 634
 635         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 636
 637         read_invitation_key();
 638
 639         return true;
 640 }
 641
 642 /*
 643   Add listening sockets.
 644 */
 645 static bool add_listen_address(char *address, bool bindto) {
 646         char *port = myport;
 647
 648         if(address) {
 649                 char *space = strchr(address, ' ');
 650                 if(space) {
 651                         *space++ = 0;
 652                         port = space;
 653                 }
 654
 655                 if(!strcmp(address, "*"))
 656                         *address = 0;
 657         }
 658
 659         struct addrinfo *ai, hint = {0};
 660         hint.ai_family = addressfamily;
 661         hint.ai_socktype = SOCK_STREAM;
 662         hint.ai_protocol = IPPROTO_TCP;
 663         hint.ai_flags = AI_PASSIVE;
 664
 665 #if HAVE_DECL_RES_INIT
 666         res_init();
 667 #endif
 668         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 669         free(address);
 670
 671         if(err || !ai) {
 672                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 673                 return false;
 674         }
 675
 676         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 677                 // Ignore duplicate addresses
 678                 bool found = false;
 679
 680                 for(int i = 0; i < listen_sockets; i++)
 681                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 682                                 found = true;
 683                                 break;
 684                         }
 685
 686                 if(found)
 687                         continue;
 688
 689                 if(listen_sockets >= MAXSOCKETS) {
 690                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 691                         return false;
 692                 }
 693
 694                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 695
 696                 if(tcp_fd < 0)
 697                         continue;
 698
 699                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 700
 701                 if(tcp_fd < 0) {
 702                         close(tcp_fd);
 703                         continue;
 704                 }
 705
 706                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 707                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 708
 709                 if(debug_level >= DEBUG_CONNECTIONS) {
 710                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 711                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 712                         free(hostname);
 713                 }
 714
 715                 listen_socket[listen_sockets].bindto = bindto;
 716                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 717                 listen_sockets++;
 718         }
 719
 720         freeaddrinfo(ai);
 721         return true;
 722 }
 723
 724 void device_enable(void) {
 725         if (devops.enable)
 726                 devops.enable();
 727
 728         /* Run tinc-up script to further initialize the tap interface */
 729
 730         char *envp[5] = {NULL};
 731         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 732         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 733         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 734         xasprintf(&envp[3], "NAME=%s", myname);
 735
 736         execute_script("tinc-up", envp);
 737
 738         for(int i = 0; i < 4; i++)
 739                 free(envp[i]);
 740 }
 741
 742 void device_disable(void) {
 743         char *envp[5] = {NULL};
 744         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 745         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 746         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 747         xasprintf(&envp[3], "NAME=%s", myname);
 748
 749         execute_script("tinc-down", envp);
 750
 751         for(int i = 0; i < 4; i++)
 752                 free(envp[i]);
 753
 754         if (devops.disable)
 755                 devops.disable();
 756 }
 757
 758 /*
 759   Configure node_t myself and set up the local sockets (listen only)
 760 */
 761 static bool setup_myself(void) {
 762         char *name, *hostname, *cipher, *digest, *type;
 763         char *address = NULL;
 764         bool port_specified = false;
 765
 766         if(!(name = get_name())) {
 767                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 768                 return false;
 769         }
 770
 771         myname = xstrdup(name);
 772         myself = new_node();
 773         myself->connection = new_connection();
 774         myself->name = name;
 775         myself->connection->name = xstrdup(name);
 776         read_host_config(config_tree, name);
 777
 778         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 779                 myport = xstrdup("655");
 780         else
 781                 port_specified = true;
 782
 783         myself->connection->options = 0;
 784         myself->connection->protocol_major = PROT_MAJOR;
 785         myself->connection->protocol_minor = PROT_MINOR;
 786
 787         myself->options |= PROT_MINOR << 24;
 788
 789 #ifdef DISABLE_LEGACY
 790         experimental = read_ecdsa_private_key();
 791         if(!experimental) {
 792                 logger(DEBUG_ALWAYS, LOG_ERR, "No private key available, cannot start tinc!");
 793                 return false;
 794         }
 795 #else
 796         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 797                 experimental = read_ecdsa_private_key();
 798                 if(!experimental)
 799                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 800         } else {
 801                 if(experimental && !read_ecdsa_private_key())
 802                         return false;
 803         }
 804
 805         if(!read_rsa_private_key()) {
 806                 if(experimental) {
 807                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for legacy protocol disabled.");
 808                 } else {
 809                         logger(DEBUG_ALWAYS, LOG_ERR, "No private keys available, cannot start tinc!");
 810                         return false;
 811                 }
 812         }
 813 #endif
 814
 815         /* Ensure myport is numeric */
 816
 817         if(!atoi(myport)) {
 818                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 819                 sockaddr_t sa;
 820                 if(!ai || !ai->ai_addr)
 821                         return false;
 822                 free(myport);
 823                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 824                 sockaddr2str(&sa, NULL, &myport);
 825         }
 826
 827         /* Read in all the subnets specified in the host configuration file */
 828
 829         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 830                 subnet_t *subnet;
 831
 832                 if(!get_config_subnet(cfg, &subnet))
 833                         return false;
 834
 835                 subnet_add(myself, subnet);
 836         }
 837
 838         /* Check some options */
 839
 840         if(!setup_myself_reloadable())
 841                 return false;
 842
 843         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 844         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 845         strictsubnets |= tunnelserver;
 846
 847         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 848                 if(max_connection_burst <= 0) {
 849                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 850                         return false;
 851                 }
 852         }
 853
 854         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 855                 if(udp_rcvbuf < 0) {
 856                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 857                         return false;
 858                 }
 859         }
 860
 861         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 862                 if(udp_sndbuf < 0) {
 863                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 864                         return false;
 865                 }
 866         }
 867
 868         int replaywin_int;
 869         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 870                 if(replaywin_int < 0) {
 871                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 872                         return false;
 873                 }
 874                 replaywin = (unsigned)replaywin_int;
 875                 sptps_replaywin = replaywin;
 876         }
 877
 878 #ifndef DISABLE_LEGACY
 879         /* Generate packet encryption key */
 880
 881         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 882                 cipher = xstrdup("blowfish");
 883
 884         if(!strcasecmp(cipher, "none")) {
 885                 myself->incipher = NULL;
 886         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 887                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 888                 return false;
 889         }
 890
 891         free(cipher);
 892
 893         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 894
 895         /* Check if we want to use message authentication codes... */
 896
 897         int maclength = 4;
 898         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 899
 900         if(maclength < 0) {
 901                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 902                 return false;
 903         }
 904
 905         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 906                 digest = xstrdup("sha1");
 907
 908         if(!strcasecmp(digest, "none")) {
 909                 myself->indigest = NULL;
 910         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 911                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 912                 return false;
 913         }
 914
 915         free(digest);
 916 #endif
 917
 918         /* Compression */
 919
 920         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 921                 if(myself->incompression < 0 || myself->incompression > 11) {
 922                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 923                         return false;
 924                 }
 925         } else
 926                 myself->incompression = 0;
 927
 928         myself->connection->outcompression = 0;
 929
 930         /* Done */
 931
 932         myself->nexthop = myself;
 933         myself->via = myself;
 934         myself->status.reachable = true;
 935         myself->last_state_change = now.tv_sec;
 936         myself->status.sptps = experimental;
 937         node_add(myself);
 938
 939         graph();
 940
 941         if(strictsubnets)
 942                 load_all_subnets();
 943         else if(autoconnect)
 944                 load_all_nodes();
 945
 946         /* Open device */
 947
 948         devops = os_devops;
 949
 950         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 951                 if(!strcasecmp(type, "dummy"))
 952                         devops = dummy_devops;
 953                 else if(!strcasecmp(type, "raw_socket"))
 954                         devops = raw_socket_devops;
 955                 else if(!strcasecmp(type, "multicast"))
 956                         devops = multicast_devops;
 957 #ifdef ENABLE_UML
 958                 else if(!strcasecmp(type, "uml"))
 959                         devops = uml_devops;
 960 #endif
 961 #ifdef ENABLE_VDE
 962                 else if(!strcasecmp(type, "vde"))
 963                         devops = vde_devops;
 964 #endif
 965                 free(type);
 966         }
 967
 968         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
 969
 970         if(!devops.setup())
 971                 return false;
 972
 973         if(device_fd >= 0)
 974                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 975
 976         /* Open sockets */
 977
 978         if(!do_detach && getenv("LISTEN_FDS")) {
 979                 sockaddr_t sa;
 980                 socklen_t salen;
 981
 982                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 983 #ifdef HAVE_UNSETENV
 984                 unsetenv("LISTEN_FDS");
 985 #endif
 986
 987                 if(listen_sockets > MAXSOCKETS) {
 988                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 989                         return false;
 990                 }
 991
 992                 for(int i = 0; i < listen_sockets; i++) {
 993                         salen = sizeof sa;
 994                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 995                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
 996                                 return false;
 997                         }
 998
 999 #ifdef FD_CLOEXEC
1000                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
1001 #endif
1002
1003                         int udp_fd = setup_vpn_in_socket(&sa);
1004                         if(udp_fd < 0)
1005                                 return false;
1006
1007                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
1008                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
1009
1010                         if(debug_level >= DEBUG_CONNECTIONS) {
1011                                 hostname = sockaddr2hostname(&sa);
1012                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
1013                                 free(hostname);
1014                         }
1015
1016                         memcpy(&listen_socket[i].sa, &sa, salen);
1017                 }
1018         } else {
1019                 listen_sockets = 0;
1020                 int cfgs = 0;
1021
1022                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1023                         cfgs++;
1024                         get_config_string(cfg, &address);
1025                         if(!add_listen_address(address, true))
1026                                 return false;
1027                 }
1028
1029                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1030                         cfgs++;
1031                         get_config_string(cfg, &address);
1032                         if(!add_listen_address(address, false))
1033                                 return false;
1034                 }
1035
1036                 if(!cfgs)
1037                         if(!add_listen_address(address, NULL))
1038                                 return false;
1039         }
1040
1041         if(!listen_sockets) {
1042                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1043                 return false;
1044         }
1045
1046         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1047
1048         if(!port_specified || atoi(myport) == 0) {
1049                 sockaddr_t sa;
1050                 socklen_t salen = sizeof sa;
1051                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1052                         free(myport);
1053                         sockaddr2str(&sa, NULL, &myport);
1054                         if(!myport)
1055                                 myport = xstrdup("655");
1056                 }
1057         }
1058
1059         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1060         myself->connection->hostname = xstrdup(myself->hostname);
1061
1062         /* Done. */
1063
1064         last_config_check = now.tv_sec;
1065
1066         return true;
1067 }
1068
1069 /*
1070   initialize network
1071 */
1072 bool setup_network(void) {
1073         init_connections();
1074         init_subnets();
1075         init_nodes();
1076         init_edges();
1077         init_requests();
1078
1079         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1080                 if(pinginterval < 1) {
1081                         pinginterval = 86400;
1082                 }
1083         } else
1084                 pinginterval = 60;
1085
1086         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
1087                 pingtimeout = 5;
1088         if(pingtimeout < 1 || pingtimeout > pinginterval)
1089                 pingtimeout = pinginterval;
1090
1091         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
1092                 maxoutbufsize = 10 * MTU;
1093
1094         if(!setup_myself())
1095                 return false;
1096
1097         if(!init_control())
1098                 return false;
1099
1100         if (!device_standby)
1101                 device_enable();
1102
1103         /* Run subnet-up scripts for our own subnets */
1104
1105         subnet_update(myself, NULL, true);
1106
1107         return true;
1108 }
1109
1110 /*
1111   close all open network connections
1112 */
1113 void close_network_connections(void) {
1114         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1115                 next = node->next;
1116                 connection_t *c = node->data;
1117                 /* Keep control connections open until the end, so they know when we really terminated */
1118                 if(c->status.control)
1119                         c->socket = -1;
1120                 c->outgoing = NULL;
1121                 terminate_connection(c, false);
1122         }
1123
1124         if(outgoing_list)
1125                 list_delete_list(outgoing_list);
1126
1127         if(myself && myself->connection) {
1128                 subnet_update(myself, NULL, false);
1129                 terminate_connection(myself->connection, false);
1130                 free_connection(myself->connection);
1131         }
1132
1133         for(int i = 0; i < listen_sockets; i++) {
1134                 io_del(&listen_socket[i].tcp);
1135                 io_del(&listen_socket[i].udp);
1136                 close(listen_socket[i].tcp.fd);
1137                 close(listen_socket[i].udp.fd);
1138         }
1139
1140         exit_requests();
1141         exit_edges();
1142         exit_subnets();
1143         exit_nodes();
1144         exit_connections();
1145
1146         if (!device_standby)
1147                 device_disable();
1148
1149         free(myport);
1150
1151         if (device_fd >= 0)
1152                 io_del(&device_io);
1153         if (devops.close)
1154                 devops.close();
1155
1156         exit_control();
1157
1158         free(myname);
1159         free(scriptextension);
1160         free(scriptinterpreter);
1161
1162         return;
1163 }