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