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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2014 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 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         fclose(fp);
 141
 142         if(!c->ecdsa)
 143                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing Ed25519 public key file `%s' failed.", fname);
 144         free(fname);
 145         return c->ecdsa;
 146 }
 147
 148 #ifndef DISABLE_LEGACY
 149 bool read_rsa_public_key(connection_t *c) {
 150         if(ecdsa_active(c->ecdsa))
 151                 return true;
 152
 153         FILE *fp;
 154         char *fname;
 155         char *n;
 156
 157         /* First, check for simple PublicKey statement */
 158
 159         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 160                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 161                 free(n);
 162                 return c->rsa;
 163         }
 164
 165         /* Else, check for PublicKeyFile statement and read it */
 166
 167         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 168                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 169
 170         fp = fopen(fname, "r");
 171
 172         if(!fp) {
 173                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 174                 free(fname);
 175                 return false;
 176         }
 177
 178         c->rsa = rsa_read_pem_public_key(fp);
 179         fclose(fp);
 180
 181         if(!c->rsa)
 182                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 183         free(fname);
 184         return c->rsa;
 185 }
 186 #endif
 187
 188 static bool read_ecdsa_private_key(void) {
 189         FILE *fp;
 190         char *fname;
 191
 192         /* Check for PrivateKeyFile statement and read it */
 193
 194         if(!get_config_string(lookup_config(config_tree, "Ed25519PrivateKeyFile"), &fname))
 195                 xasprintf(&fname, "%s" SLASH "ed25519_key.priv", confbase);
 196
 197         fp = fopen(fname, "r");
 198
 199         if(!fp) {
 200                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 private key file `%s': %s", fname, strerror(errno));
 201                 if(errno == ENOENT)
 202                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an Ed25519 keypair with `tinc -n %s generate-ed25519-keys'.", netname ?: ".");
 203                 free(fname);
 204                 return false;
 205         }
 206
 207 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 208         struct stat s;
 209
 210         if(fstat(fileno(fp), &s)) {
 211                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat Ed25519 private key file `%s': %s'", fname, strerror(errno));
 212                 free(fname);
 213                 return false;
 214         }
 215
 216         if(s.st_mode & ~0100700)
 217                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for Ed25519 private key file `%s'!", fname);
 218 #endif
 219
 220         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 221         fclose(fp);
 222
 223         if(!myself->connection->ecdsa)
 224                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 225         free(fname);
 226         return myself->connection->ecdsa;
 227 }
 228
 229 static bool read_invitation_key(void) {
 230         FILE *fp;
 231         char *fname;
 232
 233         if(invitation_key) {
 234                 ecdsa_free(invitation_key);
 235                 invitation_key = NULL;
 236         }
 237
 238         xasprintf(&fname, "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
 239
 240         fp = fopen(fname, "r");
 241
 242         if(fp) {
 243                 invitation_key = ecdsa_read_pem_private_key(fp);
 244                 fclose(fp);
 245                 if(!invitation_key)
 246                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 247         }
 248
 249         free(fname);
 250         return invitation_key;
 251 }
 252
 253 #ifndef DISABLE_LEGACY
 254 static bool read_rsa_private_key(void) {
 255         FILE *fp;
 256         char *fname;
 257         char *n, *d;
 258
 259         /* First, check for simple PrivateKey statement */
 260
 261         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 262                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 263                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 264                         free(d);
 265                         return false;
 266                 }
 267                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 268                 free(n);
 269                 free(d);
 270                 return myself->connection->rsa;
 271         }
 272
 273         /* Else, check for PrivateKeyFile statement and read it */
 274
 275         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 276                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 277
 278         fp = fopen(fname, "r");
 279
 280         if(!fp) {
 281                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 282                            fname, strerror(errno));
 283                 if(errno == ENOENT)
 284                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an RSA keypair with `tinc -n %s generate-rsa-keys'.", netname ?: ".");
 285                 free(fname);
 286                 return false;
 287         }
 288
 289 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 290         struct stat s;
 291
 292         if(fstat(fileno(fp), &s)) {
 293                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 294                 free(fname);
 295                 return false;
 296         }
 297
 298         if(s.st_mode & ~0100700)
 299                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 300 #endif
 301
 302         myself->connection->rsa = rsa_read_pem_private_key(fp);
 303         fclose(fp);
 304
 305         if(!myself->connection->rsa)
 306                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 307         free(fname);
 308         return myself->connection->rsa;
 309 }
 310 #endif
 311
 312 static timeout_t keyexpire_timeout;
 313
 314 static void keyexpire_handler(void *data) {
 315         regenerate_key();
 316         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 317 }
 318
 319 void regenerate_key(void) {
 320         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 321         send_key_changed();
 322         for splay_each(node_t, n, node_tree)
 323                 n->status.validkey_in = false;
 324 }
 325
 326 /*
 327   Read Subnets from all host config files
 328 */
 329 void load_all_subnets(void) {
 330         DIR *dir;
 331         struct dirent *ent;
 332         char *dname;
 333
 334         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 335         dir = opendir(dname);
 336         if(!dir) {
 337                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 338                 free(dname);
 339                 return;
 340         }
 341
 342         while((ent = readdir(dir))) {
 343                 if(!check_id(ent->d_name))
 344                         continue;
 345
 346                 node_t *n = lookup_node(ent->d_name);
 347                 #ifdef _DIRENT_HAVE_D_TYPE
 348                 //if(ent->d_type != DT_REG)
 349                 //      continue;
 350                 #endif
 351
 352                 splay_tree_t *config_tree;
 353                 init_configuration(&config_tree);
 354                 read_config_options(config_tree, ent->d_name);
 355                 read_host_config(config_tree, ent->d_name);
 356
 357                 if(!n) {
 358                         n = new_node();
 359                         n->name = xstrdup(ent->d_name);
 360                         node_add(n);
 361                 }
 362
 363                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 364                         subnet_t *s, *s2;
 365
 366                         if(!get_config_subnet(cfg, &s))
 367                                 continue;
 368
 369                         if((s2 = lookup_subnet(n, s))) {
 370                                 s2->expires = -1;
 371                         } else {
 372                                 subnet_add(n, s);
 373                         }
 374                 }
 375
 376                 exit_configuration(&config_tree);
 377         }
 378
 379         closedir(dir);
 380 }
 381
 382 void load_all_nodes(void) {
 383         DIR *dir;
 384         struct dirent *ent;
 385         char *dname;
 386
 387         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 388         dir = opendir(dname);
 389         if(!dir) {
 390                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 391                 free(dname);
 392                 return;
 393         }
 394
 395         while((ent = readdir(dir))) {
 396                 if(!check_id(ent->d_name))
 397                         continue;
 398
 399                 node_t *n = lookup_node(ent->d_name);
 400                 if(n)
 401                         continue;
 402
 403                 n = new_node();
 404                 n->name = xstrdup(ent->d_name);
 405                 node_add(n);
 406         }
 407
 408         closedir(dir);
 409 }
 410
 411
 412 char *get_name(void) {
 413         char *name = NULL;
 414         char *returned_name;
 415
 416         get_config_string(lookup_config(config_tree, "Name"), &name);
 417
 418         if(!name)
 419                 return NULL;
 420
 421         returned_name = replace_name(name);
 422         free(name);
 423         return returned_name;
 424 }
 425
 426 bool setup_myself_reloadable(void) {
 427         char *proxy = NULL;
 428         char *rmode = NULL;
 429         char *fmode = NULL;
 430         char *bmode = NULL;
 431         char *afname = NULL;
 432         char *space;
 433         bool choice;
 434
 435         free(scriptinterpreter);
 436         scriptinterpreter = NULL;
 437         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 438
 439
 440         free(scriptextension);
 441         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 442                 scriptextension = xstrdup("");
 443
 444         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 445         if(proxy) {
 446                 if((space = strchr(proxy, ' ')))
 447                         *space++ = 0;
 448
 449                 if(!strcasecmp(proxy, "none")) {
 450                         proxytype = PROXY_NONE;
 451                 } else if(!strcasecmp(proxy, "socks4")) {
 452                         proxytype = PROXY_SOCKS4;
 453                 } else if(!strcasecmp(proxy, "socks4a")) {
 454                         proxytype = PROXY_SOCKS4A;
 455                 } else if(!strcasecmp(proxy, "socks5")) {
 456                         proxytype = PROXY_SOCKS5;
 457                 } else if(!strcasecmp(proxy, "http")) {
 458                         proxytype = PROXY_HTTP;
 459                 } else if(!strcasecmp(proxy, "exec")) {
 460                         proxytype = PROXY_EXEC;
 461                 } else {
 462                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 463                         return false;
 464                 }
 465
 466                 switch(proxytype) {
 467                         case PROXY_NONE:
 468                         default:
 469                                 break;
 470
 471                         case PROXY_EXEC:
 472                                 if(!space || !*space) {
 473                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 474                                         return false;
 475                                 }
 476                                 proxyhost =  xstrdup(space);
 477                                 break;
 478
 479                         case PROXY_SOCKS4:
 480                         case PROXY_SOCKS4A:
 481                         case PROXY_SOCKS5:
 482                         case PROXY_HTTP:
 483                                 proxyhost = space;
 484                                 if(space && (space = strchr(space, ' ')))
 485                                         *space++ = 0, proxyport = space;
 486                                 if(space && (space = strchr(space, ' ')))
 487                                         *space++ = 0, proxyuser = space;
 488                                 if(space && (space = strchr(space, ' ')))
 489                                         *space++ = 0, proxypass = space;
 490                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 491                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 492                                         return false;
 493                                 }
 494                                 proxyhost = xstrdup(proxyhost);
 495                                 proxyport = xstrdup(proxyport);
 496                                 if(proxyuser && *proxyuser)
 497                                         proxyuser = xstrdup(proxyuser);
 498                                 if(proxypass && *proxypass)
 499                                         proxypass = xstrdup(proxypass);
 500                                 break;
 501                 }
 502
 503                 free(proxy);
 504         }
 505
 506         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 507                 myself->options |= OPTION_INDIRECT;
 508
 509         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 510                 myself->options |= OPTION_TCPONLY;
 511
 512         if(myself->options & OPTION_TCPONLY)
 513                 myself->options |= OPTION_INDIRECT;
 514
 515         get_config_bool(lookup_config(config_tree, "UDPDiscovery"), &udp_discovery);
 516         get_config_int(lookup_config(config_tree, "UDPDiscoveryKeepaliveInterval"), &udp_discovery_keepalive_interval);
 517         get_config_int(lookup_config(config_tree, "UDPDiscoveryInterval"), &udp_discovery_interval);
 518         get_config_int(lookup_config(config_tree, "UDPDiscoveryTimeout"), &udp_discovery_timeout);
 519
 520         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 521         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 522
 523         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 524                 if(!strcasecmp(rmode, "router"))
 525                         routing_mode = RMODE_ROUTER;
 526                 else if(!strcasecmp(rmode, "switch"))
 527                         routing_mode = RMODE_SWITCH;
 528                 else if(!strcasecmp(rmode, "hub"))
 529                         routing_mode = RMODE_HUB;
 530                 else {
 531                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 532                         return false;
 533                 }
 534                 free(rmode);
 535         }
 536
 537         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 538                 if(!strcasecmp(fmode, "off"))
 539                         forwarding_mode = FMODE_OFF;
 540                 else if(!strcasecmp(fmode, "internal"))
 541                         forwarding_mode = FMODE_INTERNAL;
 542                 else if(!strcasecmp(fmode, "kernel"))
 543                         forwarding_mode = FMODE_KERNEL;
 544                 else {
 545                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 546                         return false;
 547                 }
 548                 free(fmode);
 549         }
 550
 551         choice = true;
 552         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 553         if(choice)
 554                 myself->options |= OPTION_PMTU_DISCOVERY;
 555
 556         choice = true;
 557         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 558         if(choice)
 559                 myself->options |= OPTION_CLAMP_MSS;
 560
 561         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 562         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 563         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 564                 if(!strcasecmp(bmode, "no"))
 565                         broadcast_mode = BMODE_NONE;
 566                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 567                         broadcast_mode = BMODE_MST;
 568                 else if(!strcasecmp(bmode, "direct"))
 569                         broadcast_mode = BMODE_DIRECT;
 570                 else {
 571                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 572                         return false;
 573                 }
 574                 free(bmode);
 575         }
 576
 577         const char* const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
 578         for (size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
 579                 subnet_t *s = new_subnet();
 580                 if (!str2net(s, DEFAULT_BROADCAST_SUBNETS[i]))
 581                         abort();
 582                 subnet_add(NULL, s);
 583         }
 584         for (config_t* cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 585                 subnet_t *s;
 586                 if (!get_config_subnet(cfg, &s))
 587                         continue;
 588                 subnet_add(NULL, s);
 589         }
 590
 591 #if !defined(SOL_IP) || !defined(IP_TOS)
 592         if(priorityinheritance)
 593                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 594 #endif
 595
 596         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 597                 macexpire = 600;
 598
 599         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 600                 if(maxtimeout <= 0) {
 601                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 602                         return false;
 603                 }
 604         } else
 605                 maxtimeout = 900;
 606
 607         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 608                 if(!strcasecmp(afname, "IPv4"))
 609                         addressfamily = AF_INET;
 610                 else if(!strcasecmp(afname, "IPv6"))
 611                         addressfamily = AF_INET6;
 612                 else if(!strcasecmp(afname, "any"))
 613                         addressfamily = AF_UNSPEC;
 614                 else {
 615                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 616                         return false;
 617                 }
 618                 free(afname);
 619         }
 620
 621         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 622
 623         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 624                 keylifetime = 3600;
 625
 626         config_t *cfg = lookup_config(config_tree, "AutoConnect");
 627         if(cfg) {
 628                 if(!get_config_bool(cfg, &autoconnect)) {
 629                         // Some backwards compatibility with when this option was an int
 630                         int val = 0;
 631                         get_config_int(cfg, &val);
 632                         autoconnect = val;
 633                 }
 634         }
 635
 636         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 637
 638         read_invitation_key();
 639
 640         return true;
 641 }
 642
 643 /*
 644   Add listening sockets.
 645 */
 646 static bool add_listen_address(char *address, bool bindto) {
 647         char *port = myport;
 648
 649         if(address) {
 650                 char *space = strchr(address, ' ');
 651                 if(space) {
 652                         *space++ = 0;
 653                         port = space;
 654                 }
 655
 656                 if(!strcmp(address, "*"))
 657                         *address = 0;
 658         }
 659
 660         struct addrinfo *ai, hint = {0};
 661         hint.ai_family = addressfamily;
 662         hint.ai_socktype = SOCK_STREAM;
 663         hint.ai_protocol = IPPROTO_TCP;
 664         hint.ai_flags = AI_PASSIVE;
 665
 666 #ifdef HAVE_DECL_RES_INIT
 667         res_init();
 668 #endif
 669         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 670         free(address);
 671
 672         if(err || !ai) {
 673                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 674                 return false;
 675         }
 676
 677         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 678                 // Ignore duplicate addresses
 679                 bool found = false;
 680
 681                 for(int i = 0; i < listen_sockets; i++)
 682                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 683                                 found = true;
 684                                 break;
 685                         }
 686
 687                 if(found)
 688                         continue;
 689
 690                 if(listen_sockets >= MAXSOCKETS) {
 691                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 692                         return false;
 693                 }
 694
 695                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 696
 697                 if(tcp_fd < 0)
 698                         continue;
 699
 700                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 701
 702                 if(tcp_fd < 0) {
 703                         close(tcp_fd);
 704                         continue;
 705                 }
 706
 707                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 708                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 709
 710                 if(debug_level >= DEBUG_CONNECTIONS) {
 711                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 712                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 713                         free(hostname);
 714                 }
 715
 716                 listen_socket[listen_sockets].bindto = bindto;
 717                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 718                 listen_sockets++;
 719         }
 720
 721         freeaddrinfo(ai);
 722         return true;
 723 }
 724
 725 void device_enable(void) {
 726         if (devops.enable)
 727                 devops.enable();
 728
 729         /* Run tinc-up script to further initialize the tap interface */
 730
 731         char *envp[5] = {NULL};
 732         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 733         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 734         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 735         xasprintf(&envp[3], "NAME=%s", myname);
 736
 737         execute_script("tinc-up", envp);
 738
 739         for(int i = 0; i < 4; i++)
 740                 free(envp[i]);
 741 }
 742
 743 void device_disable(void) {
 744         char *envp[5] = {NULL};
 745         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 746         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 747         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 748         xasprintf(&envp[3], "NAME=%s", myname);
 749
 750         execute_script("tinc-down", envp);
 751
 752         for(int i = 0; i < 4; i++)
 753                 free(envp[i]);
 754
 755         if (devops.disable)
 756                 devops.disable();
 757 }
 758
 759 /*
 760   Configure node_t myself and set up the local sockets (listen only)
 761 */
 762 static bool setup_myself(void) {
 763         char *name, *hostname, *cipher, *digest, *type;
 764         char *address = NULL;
 765         bool port_specified = false;
 766
 767         if(!(name = get_name())) {
 768                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 769                 return false;
 770         }
 771
 772         myname = xstrdup(name);
 773         myself = new_node();
 774         myself->connection = new_connection();
 775         myself->name = name;
 776         myself->connection->name = xstrdup(name);
 777         read_host_config(config_tree, name);
 778
 779         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 780                 myport = xstrdup("655");
 781         else
 782                 port_specified = true;
 783
 784         myself->connection->options = 0;
 785         myself->connection->protocol_major = PROT_MAJOR;
 786         myself->connection->protocol_minor = PROT_MINOR;
 787
 788         myself->options |= PROT_MINOR << 24;
 789
 790 #ifdef DISABLE_LEGACY
 791         experimental = read_ecdsa_private_key();
 792         if(!experimental) {
 793                 logger(DEBUG_ALWAYS, LOG_ERR, "No private key available, cannot start tinc!");
 794                 return false;
 795         }
 796 #else
 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                 if(experimental) {
 808                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for legacy protocol disabled.");
 809                 } else {
 810                         logger(DEBUG_ALWAYS, LOG_ERR, "No private keys available, cannot start tinc!");
 811                         return false;
 812                 }
 813         }
 814 #endif
 815
 816         /* Ensure myport is numeric */
 817
 818         if(!atoi(myport)) {
 819                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 820                 sockaddr_t sa;
 821                 if(!ai || !ai->ai_addr)
 822                         return false;
 823                 free(myport);
 824                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 825                 sockaddr2str(&sa, NULL, &myport);
 826         }
 827
 828         /* Read in all the subnets specified in the host configuration file */
 829
 830         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 831                 subnet_t *subnet;
 832
 833                 if(!get_config_subnet(cfg, &subnet))
 834                         return false;
 835
 836                 subnet_add(myself, subnet);
 837         }
 838
 839         /* Check some options */
 840
 841         if(!setup_myself_reloadable())
 842                 return false;
 843
 844         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 845         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 846         strictsubnets |= tunnelserver;
 847
 848         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 849                 if(max_connection_burst <= 0) {
 850                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 851                         return false;
 852                 }
 853         }
 854
 855         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 856                 if(udp_rcvbuf <= 0) {
 857                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 858                         return false;
 859                 }
 860         }
 861
 862         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 863                 if(udp_sndbuf <= 0) {
 864                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 865                         return false;
 866                 }
 867         }
 868
 869         int replaywin_int;
 870         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 871                 if(replaywin_int < 0) {
 872                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 873                         return false;
 874                 }
 875                 replaywin = (unsigned)replaywin_int;
 876                 sptps_replaywin = replaywin;
 877         }
 878
 879 #ifndef DISABLE_LEGACY
 880         /* Generate packet encryption key */
 881
 882         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 883                 cipher = xstrdup("blowfish");
 884
 885         if(!strcasecmp(cipher, "none")) {
 886                 myself->incipher = NULL;
 887         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 888                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 889                 return false;
 890         }
 891
 892         free(cipher);
 893
 894         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 895
 896         /* Check if we want to use message authentication codes... */
 897
 898         int maclength = 4;
 899         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 900
 901         if(maclength < 0) {
 902                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 903                 return false;
 904         }
 905
 906         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 907                 digest = xstrdup("sha1");
 908
 909         if(!strcasecmp(digest, "none")) {
 910                 myself->indigest = NULL;
 911         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 912                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 913                 return false;
 914         }
 915
 916         free(digest);
 917 #endif
 918
 919         /* Compression */
 920
 921         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 922                 if(myself->incompression < 0 || myself->incompression > 11) {
 923                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 924                         return false;
 925                 }
 926         } else
 927                 myself->incompression = 0;
 928
 929         myself->connection->outcompression = 0;
 930
 931         /* Done */
 932
 933         myself->nexthop = myself;
 934         myself->via = myself;
 935         myself->status.reachable = true;
 936         myself->last_state_change = now.tv_sec;
 937         myself->status.sptps = experimental;
 938         node_add(myself);
 939
 940         graph();
 941
 942         if(strictsubnets)
 943                 load_all_subnets();
 944         else if(autoconnect)
 945                 load_all_nodes();
 946
 947         /* Open device */
 948
 949         devops = os_devops;
 950
 951         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 952                 if(!strcasecmp(type, "dummy"))
 953                         devops = dummy_devops;
 954                 else if(!strcasecmp(type, "raw_socket"))
 955                         devops = raw_socket_devops;
 956                 else if(!strcasecmp(type, "multicast"))
 957                         devops = multicast_devops;
 958 #ifdef ENABLE_UML
 959                 else if(!strcasecmp(type, "uml"))
 960                         devops = uml_devops;
 961 #endif
 962 #ifdef ENABLE_VDE
 963                 else if(!strcasecmp(type, "vde"))
 964                         devops = vde_devops;
 965 #endif
 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 }