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
 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         if(ecdsa_active(c->ecdsa))
 152                 return true;
 153
 154         FILE *fp;
 155         char *fname;
 156         char *n;
 157
 158         /* First, check for simple PublicKey statement */
 159
 160         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 161                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 162                 free(n);
 163                 return c->rsa;
 164         }
 165
 166         /* Else, check for PublicKeyFile statement and read it */
 167
 168         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 169                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 170
 171         fp = fopen(fname, "r");
 172
 173         if(!fp) {
 174                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 175                 free(fname);
 176                 return false;
 177         }
 178
 179         c->rsa = rsa_read_pem_public_key(fp);
 180         fclose(fp);
 181
 182         if(!c->rsa)
 183                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 184         free(fname);
 185         return c->rsa;
 186 }
 187 #endif
 188
 189 static bool read_ecdsa_private_key(void) {
 190         FILE *fp;
 191         char *fname;
 192
 193         /* Check for PrivateKeyFile statement and read it */
 194
 195         if(!get_config_string(lookup_config(config_tree, "Ed25519PrivateKeyFile"), &fname))
 196                 xasprintf(&fname, "%s" SLASH "ed25519_key.priv", confbase);
 197
 198         fp = fopen(fname, "r");
 199
 200         if(!fp) {
 201                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 private key file `%s': %s", fname, strerror(errno));
 202                 if(errno == ENOENT)
 203                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an Ed25519 keypair with `tinc -n %s generate-ed25519-keys'.", netname ?: ".");
 204                 free(fname);
 205                 return false;
 206         }
 207
 208 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 209         struct stat s;
 210
 211         if(fstat(fileno(fp), &s)) {
 212                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat Ed25519 private key file `%s': %s'", fname, strerror(errno));
 213                 free(fname);
 214                 return false;
 215         }
 216
 217         if(s.st_mode & ~0100700)
 218                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for Ed25519 private key file `%s'!", fname);
 219 #endif
 220
 221         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 222         fclose(fp);
 223
 224         if(!myself->connection->ecdsa)
 225                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 226         free(fname);
 227         return myself->connection->ecdsa;
 228 }
 229
 230 static bool read_invitation_key(void) {
 231         FILE *fp;
 232         char *fname;
 233
 234         if(invitation_key) {
 235                 ecdsa_free(invitation_key);
 236                 invitation_key = NULL;
 237         }
 238
 239         xasprintf(&fname, "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
 240
 241         fp = fopen(fname, "r");
 242
 243         if(fp) {
 244                 invitation_key = ecdsa_read_pem_private_key(fp);
 245                 fclose(fp);
 246                 if(!invitation_key)
 247                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 248         }
 249
 250         free(fname);
 251         return invitation_key;
 252 }
 253
 254 #ifndef DISABLE_LEGACY
 255 static bool read_rsa_private_key(void) {
 256         FILE *fp;
 257         char *fname;
 258         char *n, *d;
 259
 260         /* First, check for simple PrivateKey statement */
 261
 262         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 263                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 264                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 265                         free(d);
 266                         return false;
 267                 }
 268                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 269                 free(n);
 270                 free(d);
 271                 return myself->connection->rsa;
 272         }
 273
 274         /* Else, check for PrivateKeyFile statement and read it */
 275
 276         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 277                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 278
 279         fp = fopen(fname, "r");
 280
 281         if(!fp) {
 282                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 283                            fname, strerror(errno));
 284                 if(errno == ENOENT)
 285                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an RSA keypair with `tinc -n %s generate-rsa-keys'.", netname ?: ".");
 286                 free(fname);
 287                 return false;
 288         }
 289
 290 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 291         struct stat s;
 292
 293         if(fstat(fileno(fp), &s)) {
 294                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 295                 free(fname);
 296                 return false;
 297         }
 298
 299         if(s.st_mode & ~0100700)
 300                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 301 #endif
 302
 303         myself->connection->rsa = rsa_read_pem_private_key(fp);
 304         fclose(fp);
 305
 306         if(!myself->connection->rsa)
 307                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 308         free(fname);
 309         return myself->connection->rsa;
 310 }
 311 #endif
 312
 313 static timeout_t keyexpire_timeout;
 314
 315 static void keyexpire_handler(void *data) {
 316         regenerate_key();
 317         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 318 }
 319
 320 void regenerate_key(void) {
 321         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 322         send_key_changed();
 323         for splay_each(node_t, n, node_tree)
 324                 n->status.validkey_in = false;
 325 }
 326
 327 /*
 328   Read Subnets from all host config files
 329 */
 330 void load_all_subnets(void) {
 331         DIR *dir;
 332         struct dirent *ent;
 333         char *dname;
 334
 335         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 336         dir = opendir(dname);
 337         if(!dir) {
 338                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 339                 free(dname);
 340                 return;
 341         }
 342
 343         while((ent = readdir(dir))) {
 344                 if(!check_id(ent->d_name))
 345                         continue;
 346
 347                 node_t *n = lookup_node(ent->d_name);
 348                 #ifdef _DIRENT_HAVE_D_TYPE
 349                 //if(ent->d_type != DT_REG)
 350                 //      continue;
 351                 #endif
 352
 353                 splay_tree_t *config_tree;
 354                 init_configuration(&config_tree);
 355                 read_config_options(config_tree, ent->d_name);
 356                 read_host_config(config_tree, ent->d_name);
 357
 358                 if(!n) {
 359                         n = new_node();
 360                         n->name = xstrdup(ent->d_name);
 361                         node_add(n);
 362                 }
 363
 364                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 365                         subnet_t *s, *s2;
 366
 367                         if(!get_config_subnet(cfg, &s))
 368                                 continue;
 369
 370                         if((s2 = lookup_subnet(n, s))) {
 371                                 s2->expires = -1;
 372                         } else {
 373                                 subnet_add(n, s);
 374                         }
 375                 }
 376
 377                 exit_configuration(&config_tree);
 378         }
 379
 380         closedir(dir);
 381 }
 382
 383 void load_all_nodes(void) {
 384         DIR *dir;
 385         struct dirent *ent;
 386         char *dname;
 387
 388         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 389         dir = opendir(dname);
 390         if(!dir) {
 391                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 392                 free(dname);
 393                 return;
 394         }
 395
 396         while((ent = readdir(dir))) {
 397                 if(!check_id(ent->d_name))
 398                         continue;
 399
 400                 node_t *n = lookup_node(ent->d_name);
 401                 if(n)
 402                         continue;
 403
 404                 n = new_node();
 405                 n->name = xstrdup(ent->d_name);
 406                 node_add(n);
 407         }
 408
 409         closedir(dir);
 410 }
 411
 412
 413 char *get_name(void) {
 414         char *name = NULL;
 415         char *returned_name;
 416
 417         get_config_string(lookup_config(config_tree, "Name"), &name);
 418
 419         if(!name)
 420                 return NULL;
 421
 422         returned_name = replace_name(name);
 423         free(name);
 424         return returned_name;
 425 }
 426
 427 bool setup_myself_reloadable(void) {
 428         char *proxy = NULL;
 429         char *rmode = NULL;
 430         char *fmode = NULL;
 431         char *bmode = NULL;
 432         char *afname = NULL;
 433         char *space;
 434         bool choice;
 435
 436         free(scriptinterpreter);
 437         scriptinterpreter = NULL;
 438         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 439
 440
 441         free(scriptextension);
 442         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 443                 scriptextension = xstrdup("");
 444
 445         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 446         if(proxy) {
 447                 if((space = strchr(proxy, ' ')))
 448                         *space++ = 0;
 449
 450                 if(!strcasecmp(proxy, "none")) {
 451                         proxytype = PROXY_NONE;
 452                 } else if(!strcasecmp(proxy, "socks4")) {
 453                         proxytype = PROXY_SOCKS4;
 454                 } else if(!strcasecmp(proxy, "socks4a")) {
 455                         proxytype = PROXY_SOCKS4A;
 456                 } else if(!strcasecmp(proxy, "socks5")) {
 457                         proxytype = PROXY_SOCKS5;
 458                 } else if(!strcasecmp(proxy, "http")) {
 459                         proxytype = PROXY_HTTP;
 460                 } else if(!strcasecmp(proxy, "exec")) {
 461                         proxytype = PROXY_EXEC;
 462                 } else {
 463                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 464                         return false;
 465                 }
 466
 467                 switch(proxytype) {
 468                         case PROXY_NONE:
 469                         default:
 470                                 break;
 471
 472                         case PROXY_EXEC:
 473                                 if(!space || !*space) {
 474                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 475                                         return false;
 476                                 }
 477                                 proxyhost =  xstrdup(space);
 478                                 break;
 479
 480                         case PROXY_SOCKS4:
 481                         case PROXY_SOCKS4A:
 482                         case PROXY_SOCKS5:
 483                         case PROXY_HTTP:
 484                                 proxyhost = space;
 485                                 if(space && (space = strchr(space, ' ')))
 486                                         *space++ = 0, proxyport = space;
 487                                 if(space && (space = strchr(space, ' ')))
 488                                         *space++ = 0, proxyuser = space;
 489                                 if(space && (space = strchr(space, ' ')))
 490                                         *space++ = 0, proxypass = space;
 491                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 492                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 493                                         return false;
 494                                 }
 495                                 proxyhost = xstrdup(proxyhost);
 496                                 proxyport = xstrdup(proxyport);
 497                                 if(proxyuser && *proxyuser)
 498                                         proxyuser = xstrdup(proxyuser);
 499                                 if(proxypass && *proxypass)
 500                                         proxypass = xstrdup(proxypass);
 501                                 break;
 502                 }
 503
 504                 free(proxy);
 505         }
 506
 507         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 508                 myself->options |= OPTION_INDIRECT;
 509
 510         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 511                 myself->options |= OPTION_TCPONLY;
 512
 513         if(myself->options & OPTION_TCPONLY)
 514                 myself->options |= OPTION_INDIRECT;
 515
 516         get_config_bool(lookup_config(config_tree, "UDPDiscovery"), &udp_discovery);
 517         get_config_int(lookup_config(config_tree, "UDPDiscoveryKeepaliveInterval"), &udp_discovery_keepalive_interval);
 518         get_config_int(lookup_config(config_tree, "UDPDiscoveryInterval"), &udp_discovery_interval);
 519         get_config_int(lookup_config(config_tree, "UDPDiscoveryTimeout"), &udp_discovery_timeout);
 520
 521         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 522         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 523
 524         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 525                 if(!strcasecmp(rmode, "router"))
 526                         routing_mode = RMODE_ROUTER;
 527                 else if(!strcasecmp(rmode, "switch"))
 528                         routing_mode = RMODE_SWITCH;
 529                 else if(!strcasecmp(rmode, "hub"))
 530                         routing_mode = RMODE_HUB;
 531                 else {
 532                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 533                         return false;
 534                 }
 535                 free(rmode);
 536         }
 537
 538         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 539                 if(!strcasecmp(fmode, "off"))
 540                         forwarding_mode = FMODE_OFF;
 541                 else if(!strcasecmp(fmode, "internal"))
 542                         forwarding_mode = FMODE_INTERNAL;
 543                 else if(!strcasecmp(fmode, "kernel"))
 544                         forwarding_mode = FMODE_KERNEL;
 545                 else {
 546                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 547                         return false;
 548                 }
 549                 free(fmode);
 550         }
 551
 552         choice = true;
 553         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 554         if(choice)
 555                 myself->options |= OPTION_PMTU_DISCOVERY;
 556
 557         choice = true;
 558         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 559         if(choice)
 560                 myself->options |= OPTION_CLAMP_MSS;
 561
 562         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 563         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 564         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 565                 if(!strcasecmp(bmode, "no"))
 566                         broadcast_mode = BMODE_NONE;
 567                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 568                         broadcast_mode = BMODE_MST;
 569                 else if(!strcasecmp(bmode, "direct"))
 570                         broadcast_mode = BMODE_DIRECT;
 571                 else {
 572                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 573                         return false;
 574                 }
 575                 free(bmode);
 576         }
 577
 578         const char* const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
 579         for (size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
 580                 subnet_t *s = new_subnet();
 581                 if (!str2net(s, DEFAULT_BROADCAST_SUBNETS[i]))
 582                         abort();
 583                 subnet_add(NULL, s);
 584         }
 585         for (config_t* cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 586                 subnet_t *s;
 587                 if (!get_config_subnet(cfg, &s))
 588                         continue;
 589                 subnet_add(NULL, s);
 590         }
 591
 592 #if !defined(SOL_IP) || !defined(IP_TOS)
 593         if(priorityinheritance)
 594                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 595 #endif
 596
 597         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 598                 macexpire = 600;
 599
 600         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 601                 if(maxtimeout <= 0) {
 602                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 603                         return false;
 604                 }
 605         } else
 606                 maxtimeout = 900;
 607
 608         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 609                 if(!strcasecmp(afname, "IPv4"))
 610                         addressfamily = AF_INET;
 611                 else if(!strcasecmp(afname, "IPv6"))
 612                         addressfamily = AF_INET6;
 613                 else if(!strcasecmp(afname, "any"))
 614                         addressfamily = AF_UNSPEC;
 615                 else {
 616                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 617                         return false;
 618                 }
 619                 free(afname);
 620         }
 621
 622         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 623
 624         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 625                 keylifetime = 3600;
 626
 627         config_t *cfg = lookup_config(config_tree, "AutoConnect");
 628         if(cfg) {
 629                 if(!get_config_bool(cfg, &autoconnect)) {
 630                         // Some backwards compatibility with when this option was an int
 631                         int val = 0;
 632                         get_config_int(cfg, &val);
 633                         autoconnect = val;
 634                 }
 635         }
 636
 637         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 638
 639         read_invitation_key();
 640
 641         return true;
 642 }
 643
 644 /*
 645   Add listening sockets.
 646 */
 647 static bool add_listen_address(char *address, bool bindto) {
 648         char *port = myport;
 649
 650         if(address) {
 651                 char *space = strchr(address, ' ');
 652                 if(space) {
 653                         *space++ = 0;
 654                         port = space;
 655                 }
 656
 657                 if(!strcmp(address, "*"))
 658                         *address = 0;
 659         }
 660
 661         struct addrinfo *ai, hint = {0};
 662         hint.ai_family = addressfamily;
 663         hint.ai_socktype = SOCK_STREAM;
 664         hint.ai_protocol = IPPROTO_TCP;
 665         hint.ai_flags = AI_PASSIVE;
 666
 667 #ifdef HAVE_DECL_RES_INIT
 668         res_init();
 669 #endif
 670         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 671         free(address);
 672
 673         if(err || !ai) {
 674                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 675                 return false;
 676         }
 677
 678         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 679                 // Ignore duplicate addresses
 680                 bool found = false;
 681
 682                 for(int i = 0; i < listen_sockets; i++)
 683                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 684                                 found = true;
 685                                 break;
 686                         }
 687
 688                 if(found)
 689                         continue;
 690
 691                 if(listen_sockets >= MAXSOCKETS) {
 692                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 693                         return false;
 694                 }
 695
 696                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 697
 698                 if(tcp_fd < 0)
 699                         continue;
 700
 701                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 702
 703                 if(tcp_fd < 0) {
 704                         close(tcp_fd);
 705                         continue;
 706                 }
 707
 708                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 709                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 710
 711                 if(debug_level >= DEBUG_CONNECTIONS) {
 712                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 713                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 714                         free(hostname);
 715                 }
 716
 717                 listen_socket[listen_sockets].bindto = bindto;
 718                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 719                 listen_sockets++;
 720         }
 721
 722         freeaddrinfo(ai);
 723         return true;
 724 }
 725
 726 void device_enable(void) {
 727         if (devops.enable)
 728                 devops.enable();
 729
 730         /* Run tinc-up script to further initialize the tap interface */
 731
 732         char *envp[5] = {NULL};
 733         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 734         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 735         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 736         xasprintf(&envp[3], "NAME=%s", myname);
 737
 738         execute_script("tinc-up", envp);
 739
 740         for(int i = 0; i < 4; i++)
 741                 free(envp[i]);
 742 }
 743
 744 void device_disable(void) {
 745         char *envp[5] = {NULL};
 746         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 747         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 748         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 749         xasprintf(&envp[3], "NAME=%s", myname);
 750
 751         execute_script("tinc-down", envp);
 752
 753         for(int i = 0; i < 4; i++)
 754                 free(envp[i]);
 755
 756         if (devops.disable)
 757                 devops.disable();
 758 }
 759
 760 /*
 761   Configure node_t myself and set up the local sockets (listen only)
 762 */
 763 static bool setup_myself(void) {
 764         char *name, *hostname, *cipher, *digest, *type;
 765         char *address = NULL;
 766         bool port_specified = false;
 767
 768         if(!(name = get_name())) {
 769                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 770                 return false;
 771         }
 772
 773         myname = xstrdup(name);
 774         myself = new_node();
 775         myself->connection = new_connection();
 776         myself->name = name;
 777         myself->connection->name = xstrdup(name);
 778         read_host_config(config_tree, name);
 779
 780         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 781                 myport = xstrdup("655");
 782         else
 783                 port_specified = true;
 784
 785         myself->connection->options = 0;
 786         myself->connection->protocol_major = PROT_MAJOR;
 787         myself->connection->protocol_minor = PROT_MINOR;
 788
 789         myself->options |= PROT_MINOR << 24;
 790
 791 #ifdef DISABLE_LEGACY
 792         experimental = read_ecdsa_private_key();
 793         if(!experimental) {
 794                 logger(DEBUG_ALWAYS, LOG_ERR, "No private key available, cannot start tinc!");
 795                 return false;
 796         }
 797 #else
 798         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 799                 experimental = read_ecdsa_private_key();
 800                 if(!experimental)
 801                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 802         } else {
 803                 if(experimental && !read_ecdsa_private_key())
 804                         return false;
 805         }
 806
 807         if(!read_rsa_private_key()) {
 808                 if(experimental) {
 809                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for legacy protocol disabled.");
 810                 } else {
 811                         logger(DEBUG_ALWAYS, LOG_ERR, "No private keys available, cannot start tinc!");
 812                         return false;
 813                 }
 814         }
 815 #endif
 816
 817         /* Ensure myport is numeric */
 818
 819         if(!atoi(myport)) {
 820                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 821                 sockaddr_t sa;
 822                 if(!ai || !ai->ai_addr)
 823                         return false;
 824                 free(myport);
 825                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 826                 sockaddr2str(&sa, NULL, &myport);
 827         }
 828
 829         /* Read in all the subnets specified in the host configuration file */
 830
 831         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 832                 subnet_t *subnet;
 833
 834                 if(!get_config_subnet(cfg, &subnet))
 835                         return false;
 836
 837                 subnet_add(myself, subnet);
 838         }
 839
 840         /* Check some options */
 841
 842         if(!setup_myself_reloadable())
 843                 return false;
 844
 845         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 846         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 847         strictsubnets |= tunnelserver;
 848
 849         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 850                 if(max_connection_burst <= 0) {
 851                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 852                         return false;
 853                 }
 854         }
 855
 856         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 857                 if(udp_rcvbuf <= 0) {
 858                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 859                         return false;
 860                 }
 861         }
 862
 863         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 864                 if(udp_sndbuf <= 0) {
 865                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 866                         return false;
 867                 }
 868         }
 869
 870         int replaywin_int;
 871         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 872                 if(replaywin_int < 0) {
 873                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 874                         return false;
 875                 }
 876                 replaywin = (unsigned)replaywin_int;
 877                 sptps_replaywin = replaywin;
 878         }
 879
 880 #ifndef DISABLE_LEGACY
 881         /* Generate packet encryption key */
 882
 883         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 884                 cipher = xstrdup("blowfish");
 885
 886         if(!strcasecmp(cipher, "none")) {
 887                 myself->incipher = NULL;
 888         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 889                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 890                 return false;
 891         }
 892
 893         free(cipher);
 894
 895         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 896
 897         /* Check if we want to use message authentication codes... */
 898
 899         int maclength = 4;
 900         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 901
 902         if(maclength < 0) {
 903                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 904                 return false;
 905         }
 906
 907         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 908                 digest = xstrdup("sha1");
 909
 910         if(!strcasecmp(digest, "none")) {
 911                 myself->indigest = NULL;
 912         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 913                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 914                 return false;
 915         }
 916
 917         free(digest);
 918 #endif
 919
 920         /* Compression */
 921
 922         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 923                 if(myself->incompression < 0 || myself->incompression > 11) {
 924                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 925                         return false;
 926                 }
 927         } else
 928                 myself->incompression = 0;
 929
 930         myself->connection->outcompression = 0;
 931
 932         /* Done */
 933
 934         myself->nexthop = myself;
 935         myself->via = myself;
 936         myself->status.reachable = true;
 937         myself->last_state_change = now.tv_sec;
 938         myself->status.sptps = experimental;
 939         node_add(myself);
 940
 941         graph();
 942
 943         if(strictsubnets)
 944                 load_all_subnets();
 945         else if(autoconnect)
 946                 load_all_nodes();
 947
 948         /* Open device */
 949
 950         devops = os_devops;
 951
 952         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 953                 if(!strcasecmp(type, "dummy"))
 954                         devops = dummy_devops;
 955                 else if(!strcasecmp(type, "raw_socket"))
 956                         devops = raw_socket_devops;
 957                 else if(!strcasecmp(type, "multicast"))
 958                         devops = multicast_devops;
 959 #ifdef ENABLE_UML
 960                 else if(!strcasecmp(type, "uml"))
 961                         devops = uml_devops;
 962 #endif
 963 #ifdef ENABLE_VDE
 964                 else if(!strcasecmp(type, "vde"))
 965                         devops = vde_devops;
 966 #endif
 967         }
 968
 969         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
 970
 971         if(!devops.setup())
 972                 return false;
 973
 974         if(device_fd >= 0)
 975                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 976
 977         /* Open sockets */
 978
 979         if(!do_detach && getenv("LISTEN_FDS")) {
 980                 sockaddr_t sa;
 981                 socklen_t salen;
 982
 983                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 984 #ifdef HAVE_UNSETENV
 985                 unsetenv("LISTEN_FDS");
 986 #endif
 987
 988                 if(listen_sockets > MAXSOCKETS) {
 989                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 990                         return false;
 991                 }
 992
 993                 for(int i = 0; i < listen_sockets; i++) {
 994                         salen = sizeof sa;
 995                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 996                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
 997                                 return false;
 998                         }
 999
1000 #ifdef FD_CLOEXEC
1001                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
1002 #endif
1003
1004                         int udp_fd = setup_vpn_in_socket(&sa);
1005                         if(udp_fd < 0)
1006                                 return false;
1007
1008                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
1009                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
1010
1011                         if(debug_level >= DEBUG_CONNECTIONS) {
1012                                 hostname = sockaddr2hostname(&sa);
1013                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
1014                                 free(hostname);
1015                         }
1016
1017                         memcpy(&listen_socket[i].sa, &sa, salen);
1018                 }
1019         } else {
1020                 listen_sockets = 0;
1021                 int cfgs = 0;
1022
1023                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1024                         cfgs++;
1025                         get_config_string(cfg, &address);
1026                         if(!add_listen_address(address, true))
1027                                 return false;
1028                 }
1029
1030                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1031                         cfgs++;
1032                         get_config_string(cfg, &address);
1033                         if(!add_listen_address(address, false))
1034                                 return false;
1035                 }
1036
1037                 if(!cfgs)
1038                         if(!add_listen_address(address, NULL))
1039                                 return false;
1040         }
1041
1042         if(!listen_sockets) {
1043                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1044                 return false;
1045         }
1046
1047         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1048
1049         if(!port_specified || atoi(myport) == 0) {
1050                 sockaddr_t sa;
1051                 socklen_t salen = sizeof sa;
1052                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1053                         free(myport);
1054                         sockaddr2str(&sa, NULL, &myport);
1055                         if(!myport)
1056                                 myport = xstrdup("655");
1057                 }
1058         }
1059
1060         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1061         myself->connection->hostname = xstrdup(myself->hostname);
1062
1063         /* Done. */
1064
1065         last_config_check = now.tv_sec;
1066
1067         return true;
1068 }
1069
1070 /*
1071   initialize network
1072 */
1073 bool setup_network(void) {
1074         init_connections();
1075         init_subnets();
1076         init_nodes();
1077         init_edges();
1078         init_requests();
1079
1080         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1081                 if(pinginterval < 1) {
1082                         pinginterval = 86400;
1083                 }
1084         } else
1085                 pinginterval = 60;
1086
1087         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
1088                 pingtimeout = 5;
1089         if(pingtimeout < 1 || pingtimeout > pinginterval)
1090                 pingtimeout = pinginterval;
1091
1092         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
1093                 maxoutbufsize = 10 * MTU;
1094
1095         if(!setup_myself())
1096                 return false;
1097
1098         if(!init_control())
1099                 return false;
1100
1101         if (!device_standby)
1102                 device_enable();
1103
1104         /* Run subnet-up scripts for our own subnets */
1105
1106         subnet_update(myself, NULL, true);
1107
1108         return true;
1109 }
1110
1111 /*
1112   close all open network connections
1113 */
1114 void close_network_connections(void) {
1115         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1116                 next = node->next;
1117                 connection_t *c = node->data;
1118                 /* Keep control connections open until the end, so they know when we really terminated */
1119                 if(c->status.control)
1120                         c->socket = -1;
1121                 c->outgoing = NULL;
1122                 terminate_connection(c, false);
1123         }
1124
1125         if(outgoing_list)
1126                 list_delete_list(outgoing_list);
1127
1128         if(myself && myself->connection) {
1129                 subnet_update(myself, NULL, false);
1130                 terminate_connection(myself->connection, false);
1131                 free_connection(myself->connection);
1132         }
1133
1134         for(int i = 0; i < listen_sockets; i++) {
1135                 io_del(&listen_socket[i].tcp);
1136                 io_del(&listen_socket[i].udp);
1137                 close(listen_socket[i].tcp.fd);
1138                 close(listen_socket[i].udp.fd);
1139         }
1140
1141         exit_requests();
1142         exit_edges();
1143         exit_subnets();
1144         exit_nodes();
1145         exit_connections();
1146
1147         if (!device_standby)
1148                 device_disable();
1149
1150         free(myport);
1151
1152         if (device_fd >= 0)
1153                 io_del(&device_io);
1154         if (devops.close)
1155                 devops.close();
1156
1157         exit_control();
1158
1159         free(myname);
1160         free(scriptextension);
1161         free(scriptinterpreter);
1162
1163         return;
1164 }