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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2017 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 #ifdef HAVE_MINIUPNPC
  47 #include "upnp.h"
  48 #endif
  49
  50 char *myport;
  51 static io_t device_io;
  52 devops_t devops;
  53 bool device_standby = false;
  54
  55 char *proxyhost;
  56 char *proxyport;
  57 char *proxyuser;
  58 char *proxypass;
  59 proxytype_t proxytype;
  60 bool autoconnect;
  61 bool disablebuggypeers;
  62
  63 char *scriptinterpreter;
  64 char *scriptextension;
  65
  66 bool node_read_ecdsa_public_key(node_t *n) {
  67         if(ecdsa_active(n->ecdsa))
  68                 return true;
  69
  70         splay_tree_t *config_tree;
  71         FILE *fp;
  72         char *pubname = NULL;
  73         char *p;
  74
  75         init_configuration(&config_tree);
  76         if(!read_host_config(config_tree, n->name))
  77                 goto exit;
  78
  79         /* First, check for simple Ed25519PublicKey statement */
  80
  81         if(get_config_string(lookup_config(config_tree, "Ed25519PublicKey"), &p)) {
  82                 n->ecdsa = ecdsa_set_base64_public_key(p);
  83                 free(p);
  84                 goto exit;
  85         }
  86
  87         /* Else, check for Ed25519PublicKeyFile statement and read it */
  88
  89         if(!get_config_string(lookup_config(config_tree, "Ed25519PublicKeyFile"), &pubname))
  90                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  91
  92         fp = fopen(pubname, "r");
  93
  94         if(!fp)
  95                 goto exit;
  96
  97         n->ecdsa = ecdsa_read_pem_public_key(fp);
  98         fclose(fp);
  99
 100 exit:
 101         exit_configuration(&config_tree);
 102         free(pubname);
 103         return n->ecdsa;
 104 }
 105
 106 bool read_ecdsa_public_key(connection_t *c) {
 107         if(ecdsa_active(c->ecdsa))
 108                 return true;
 109
 110         FILE *fp;
 111         char *fname;
 112         char *p;
 113
 114         if(!c->config_tree) {
 115                 init_configuration(&c->config_tree);
 116                 if(!read_host_config(c->config_tree, c->name))
 117                         return false;
 118         }
 119
 120         /* First, check for simple Ed25519PublicKey statement */
 121
 122         if(get_config_string(lookup_config(c->config_tree, "Ed25519PublicKey"), &p)) {
 123                 c->ecdsa = ecdsa_set_base64_public_key(p);
 124                 free(p);
 125                 return c->ecdsa;
 126         }
 127
 128         /* Else, check for Ed25519PublicKeyFile statement and read it */
 129
 130         if(!get_config_string(lookup_config(c->config_tree, "Ed25519PublicKeyFile"), &fname))
 131                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 132
 133         fp = fopen(fname, "r");
 134
 135         if(!fp) {
 136                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 public key file `%s': %s",
 137                            fname, strerror(errno));
 138                 free(fname);
 139                 return false;
 140         }
 141
 142         c->ecdsa = ecdsa_read_pem_public_key(fp);
 143
 144         if(!c->ecdsa && errno != ENOENT)
 145                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing Ed25519 public key file `%s' failed.", fname);
 146
 147         fclose(fp);
 148         free(fname);
 149         return c->ecdsa;
 150 }
 151
 152 #ifndef DISABLE_LEGACY
 153 bool read_rsa_public_key(connection_t *c) {
 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[PATH_MAX];
 233
 234         if(invitation_key) {
 235                 ecdsa_free(invitation_key);
 236                 invitation_key = NULL;
 237         }
 238
 239         snprintf(fname, sizeof 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         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 void load_all_nodes(void) {
 327         DIR *dir;
 328         struct dirent *ent;
 329         char dname[PATH_MAX];
 330
 331         snprintf(dname, sizeof dname, "%s" SLASH "hosts", confbase);
 332         dir = opendir(dname);
 333         if(!dir) {
 334                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 335                 return;
 336         }
 337
 338         while((ent = readdir(dir))) {
 339                 if(!check_id(ent->d_name))
 340                         continue;
 341
 342                 node_t *n = lookup_node(ent->d_name);
 343
 344                 splay_tree_t *config_tree;
 345                 init_configuration(&config_tree);
 346                 read_config_options(config_tree, ent->d_name);
 347                 read_host_config(config_tree, ent->d_name);
 348
 349                 if(!n) {
 350                         n = new_node();
 351                         n->name = xstrdup(ent->d_name);
 352                         node_add(n);
 353                 }
 354
 355                 if(strictsubnets) {
 356                         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 357                                 subnet_t *s, *s2;
 358
 359                                 if(!get_config_subnet(cfg, &s))
 360                                         continue;
 361
 362                                 if((s2 = lookup_subnet(n, s))) {
 363                                         s2->expires = -1;
 364                                         free(s);
 365                                 } else {
 366                                         subnet_add(n, s);
 367                                 }
 368                         }
 369                 }
 370
 371                 if(lookup_config(config_tree, "Address"))
 372                         n->status.has_address = true;
 373
 374                 exit_configuration(&config_tree);
 375         }
 376
 377         closedir(dir);
 378 }
 379
 380 char *get_name(void) {
 381         char *name = NULL;
 382         char *returned_name;
 383
 384         get_config_string(lookup_config(config_tree, "Name"), &name);
 385
 386         if(!name)
 387                 return NULL;
 388
 389         returned_name = replace_name(name);
 390         free(name);
 391         return returned_name;
 392 }
 393
 394 bool setup_myself_reloadable(void) {
 395         char *proxy = NULL;
 396         char *rmode = NULL;
 397         char *fmode = NULL;
 398         char *bmode = NULL;
 399         char *afname = NULL;
 400         char *space;
 401         bool choice;
 402
 403         free(scriptinterpreter);
 404         scriptinterpreter = NULL;
 405         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 406
 407
 408         free(scriptextension);
 409         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 410                 scriptextension = xstrdup("");
 411
 412         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 413         if(proxy) {
 414                 if((space = strchr(proxy, ' ')))
 415                         *space++ = 0;
 416
 417                 if(!strcasecmp(proxy, "none")) {
 418                         proxytype = PROXY_NONE;
 419                 } else if(!strcasecmp(proxy, "socks4")) {
 420                         proxytype = PROXY_SOCKS4;
 421                 } else if(!strcasecmp(proxy, "socks4a")) {
 422                         proxytype = PROXY_SOCKS4A;
 423                 } else if(!strcasecmp(proxy, "socks5")) {
 424                         proxytype = PROXY_SOCKS5;
 425                 } else if(!strcasecmp(proxy, "http")) {
 426                         proxytype = PROXY_HTTP;
 427                 } else if(!strcasecmp(proxy, "exec")) {
 428                         proxytype = PROXY_EXEC;
 429                 } else {
 430                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 431                         return false;
 432                 }
 433
 434                 switch(proxytype) {
 435                         case PROXY_NONE:
 436                         default:
 437                                 break;
 438
 439                         case PROXY_EXEC:
 440                                 if(!space || !*space) {
 441                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 442                                         return false;
 443                                 }
 444                                 proxyhost =  xstrdup(space);
 445                                 break;
 446
 447                         case PROXY_SOCKS4:
 448                         case PROXY_SOCKS4A:
 449                         case PROXY_SOCKS5:
 450                         case PROXY_HTTP:
 451                                 proxyhost = space;
 452                                 if(space && (space = strchr(space, ' ')))
 453                                         *space++ = 0, proxyport = space;
 454                                 if(space && (space = strchr(space, ' ')))
 455                                         *space++ = 0, proxyuser = space;
 456                                 if(space && (space = strchr(space, ' ')))
 457                                         *space++ = 0, proxypass = space;
 458                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 459                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 460                                         return false;
 461                                 }
 462                                 proxyhost = xstrdup(proxyhost);
 463                                 proxyport = xstrdup(proxyport);
 464                                 if(proxyuser && *proxyuser)
 465                                         proxyuser = xstrdup(proxyuser);
 466                                 if(proxypass && *proxypass)
 467                                         proxypass = xstrdup(proxypass);
 468                                 break;
 469                 }
 470
 471                 free(proxy);
 472         }
 473
 474         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 475                 myself->options |= OPTION_INDIRECT;
 476
 477         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 478                 myself->options |= OPTION_TCPONLY;
 479
 480         if(myself->options & OPTION_TCPONLY)
 481                 myself->options |= OPTION_INDIRECT;
 482
 483         get_config_bool(lookup_config(config_tree, "UDPDiscovery"), &udp_discovery);
 484         get_config_int(lookup_config(config_tree, "UDPDiscoveryKeepaliveInterval"), &udp_discovery_keepalive_interval);
 485         get_config_int(lookup_config(config_tree, "UDPDiscoveryInterval"), &udp_discovery_interval);
 486         get_config_int(lookup_config(config_tree, "UDPDiscoveryTimeout"), &udp_discovery_timeout);
 487
 488         get_config_int(lookup_config(config_tree, "MTUInfoInterval"), &mtu_info_interval);
 489         get_config_int(lookup_config(config_tree, "UDPInfoInterval"), &udp_info_interval);
 490
 491         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 492         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 493
 494         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 495                 if(!strcasecmp(rmode, "router"))
 496                         routing_mode = RMODE_ROUTER;
 497                 else if(!strcasecmp(rmode, "switch"))
 498                         routing_mode = RMODE_SWITCH;
 499                 else if(!strcasecmp(rmode, "hub"))
 500                         routing_mode = RMODE_HUB;
 501                 else {
 502                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 503                         return false;
 504                 }
 505                 free(rmode);
 506         }
 507
 508         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 509                 if(!strcasecmp(fmode, "off"))
 510                         forwarding_mode = FMODE_OFF;
 511                 else if(!strcasecmp(fmode, "internal"))
 512                         forwarding_mode = FMODE_INTERNAL;
 513                 else if(!strcasecmp(fmode, "kernel"))
 514                         forwarding_mode = FMODE_KERNEL;
 515                 else {
 516                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 517                         return false;
 518                 }
 519                 free(fmode);
 520         }
 521
 522         choice = true;
 523         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 524         if(choice)
 525                 myself->options |= OPTION_PMTU_DISCOVERY;
 526
 527         choice = true;
 528         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 529         if(choice)
 530                 myself->options |= OPTION_CLAMP_MSS;
 531
 532         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 533         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 534         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 535                 if(!strcasecmp(bmode, "no"))
 536                         broadcast_mode = BMODE_NONE;
 537                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 538                         broadcast_mode = BMODE_MST;
 539                 else if(!strcasecmp(bmode, "direct"))
 540                         broadcast_mode = BMODE_DIRECT;
 541                 else {
 542                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 543                         return false;
 544                 }
 545                 free(bmode);
 546         }
 547
 548         const char* const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
 549         for (size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
 550                 subnet_t *s = new_subnet();
 551                 if (!str2net(s, DEFAULT_BROADCAST_SUBNETS[i]))
 552                         abort();
 553                 subnet_add(NULL, s);
 554         }
 555         for (config_t* cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 556                 subnet_t *s;
 557                 if (!get_config_subnet(cfg, &s))
 558                         continue;
 559                 subnet_add(NULL, s);
 560         }
 561
 562 #if !defined(IPPROTO_IP) || !defined(IP_TOS)
 563         if(priorityinheritance)
 564                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv4 connections", "PriorityInheritance");
 565 #endif
 566
 567 #if !defined(IPPROTO_IPV6) || !defined(IPV6_TCLASS)
 568         if(priorityinheritance)
 569                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv6 connections", "PriorityInheritance");
 570 #endif
 571
 572         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 573                 macexpire = 600;
 574
 575         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 576                 if(maxtimeout <= 0) {
 577                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 578                         return false;
 579                 }
 580         } else
 581                 maxtimeout = 900;
 582
 583         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 584                 if(!strcasecmp(afname, "IPv4"))
 585                         addressfamily = AF_INET;
 586                 else if(!strcasecmp(afname, "IPv6"))
 587                         addressfamily = AF_INET6;
 588                 else if(!strcasecmp(afname, "any"))
 589                         addressfamily = AF_UNSPEC;
 590                 else {
 591                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 592                         return false;
 593                 }
 594                 free(afname);
 595         }
 596
 597         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 598
 599         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 600                 keylifetime = 3600;
 601
 602         config_t *cfg = lookup_config(config_tree, "AutoConnect");
 603         if(cfg) {
 604                 if(!get_config_bool(cfg, &autoconnect)) {
 605                         // Some backwards compatibility with when this option was an int
 606                         int val = 0;
 607                         get_config_int(cfg, &val);
 608                         autoconnect = val;
 609                 }
 610         }
 611
 612         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 613
 614         read_invitation_key();
 615
 616         return true;
 617 }
 618
 619 /*
 620   Add listening sockets.
 621 */
 622 static bool add_listen_address(char *address, bool bindto) {
 623         char *port = myport;
 624
 625         if(address) {
 626                 char *space = strchr(address, ' ');
 627                 if(space) {
 628                         *space++ = 0;
 629                         port = space;
 630                 }
 631
 632                 if(!strcmp(address, "*"))
 633                         *address = 0;
 634         }
 635
 636         struct addrinfo *ai, hint = {0};
 637         hint.ai_family = addressfamily;
 638         hint.ai_socktype = SOCK_STREAM;
 639         hint.ai_protocol = IPPROTO_TCP;
 640         hint.ai_flags = AI_PASSIVE;
 641
 642 #if HAVE_DECL_RES_INIT
 643         res_init();
 644 #endif
 645         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 646         free(address);
 647
 648         if(err || !ai) {
 649                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 650                 return false;
 651         }
 652
 653         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 654                 // Ignore duplicate addresses
 655                 bool found = false;
 656
 657                 for(int i = 0; i < listen_sockets; i++)
 658                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 659                                 found = true;
 660                                 break;
 661                         }
 662
 663                 if(found)
 664                         continue;
 665
 666                 if(listen_sockets >= MAXSOCKETS) {
 667                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 668                         return false;
 669                 }
 670
 671                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 672
 673                 if(tcp_fd < 0)
 674                         continue;
 675
 676                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 677
 678                 if(udp_fd < 0) {
 679                         close(tcp_fd);
 680                         continue;
 681                 }
 682
 683                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 684                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 685
 686                 if(debug_level >= DEBUG_CONNECTIONS) {
 687                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 688                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 689                         free(hostname);
 690                 }
 691
 692                 listen_socket[listen_sockets].bindto = bindto;
 693                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 694                 listen_sockets++;
 695         }
 696
 697         freeaddrinfo(ai);
 698         return true;
 699 }
 700
 701 void device_enable(void) {
 702         if (devops.enable)
 703                 devops.enable();
 704
 705         /* Run tinc-up script to further initialize the tap interface */
 706
 707         environment_t env;
 708         environment_init(&env);
 709         execute_script("tinc-up", &env);
 710         environment_exit(&env);
 711 }
 712
 713 void device_disable(void) {
 714         environment_t env;
 715         environment_init(&env);
 716         execute_script("tinc-down", &env);
 717         environment_exit(&env);
 718
 719         if (devops.disable)
 720                 devops.disable();
 721 }
 722
 723 /*
 724   Configure node_t myself and set up the local sockets (listen only)
 725 */
 726 static bool setup_myself(void) {
 727         char *name, *hostname, *cipher, *digest, *type;
 728         char *address = NULL;
 729         bool port_specified = false;
 730
 731         if(!(name = get_name())) {
 732                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 733                 return false;
 734         }
 735
 736         myname = xstrdup(name);
 737         myself = new_node();
 738         myself->connection = new_connection();
 739         myself->name = name;
 740         myself->connection->name = xstrdup(name);
 741         read_host_config(config_tree, name);
 742
 743         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 744                 myport = xstrdup("655");
 745         else
 746                 port_specified = true;
 747
 748         myself->connection->options = 0;
 749         myself->connection->protocol_major = PROT_MAJOR;
 750         myself->connection->protocol_minor = PROT_MINOR;
 751
 752         myself->options |= PROT_MINOR << 24;
 753
 754 #ifdef DISABLE_LEGACY
 755         experimental = read_ecdsa_private_key();
 756         if(!experimental) {
 757                 logger(DEBUG_ALWAYS, LOG_ERR, "No private key available, cannot start tinc!");
 758                 return false;
 759         }
 760 #else
 761         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 762                 experimental = read_ecdsa_private_key();
 763                 if(!experimental)
 764                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 765         } else {
 766                 if(experimental && !read_ecdsa_private_key())
 767                         return false;
 768         }
 769
 770         if(!read_rsa_private_key()) {
 771                 if(experimental) {
 772                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for legacy protocol disabled.");
 773                 } else {
 774                         logger(DEBUG_ALWAYS, LOG_ERR, "No private keys available, cannot start tinc!");
 775                         return false;
 776                 }
 777         }
 778 #endif
 779
 780         /* Ensure myport is numeric */
 781
 782         if(!atoi(myport)) {
 783                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 784                 sockaddr_t sa;
 785                 if(!ai || !ai->ai_addr)
 786                         return false;
 787                 free(myport);
 788                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 789                 sockaddr2str(&sa, NULL, &myport);
 790         }
 791
 792         /* Read in all the subnets specified in the host configuration file */
 793
 794         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 795                 subnet_t *subnet;
 796
 797                 if(!get_config_subnet(cfg, &subnet))
 798                         return false;
 799
 800                 subnet_add(myself, subnet);
 801         }
 802
 803         /* Check some options */
 804
 805         if(!setup_myself_reloadable())
 806                 return false;
 807
 808         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 809         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 810         strictsubnets |= tunnelserver;
 811
 812         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 813                 if(max_connection_burst <= 0) {
 814                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 815                         return false;
 816                 }
 817         }
 818
 819         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 820                 if(udp_rcvbuf < 0) {
 821                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 822                         return false;
 823                 }
 824         }
 825
 826         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 827                 if(udp_sndbuf < 0) {
 828                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 829                         return false;
 830                 }
 831         }
 832
 833         int replaywin_int;
 834         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 835                 if(replaywin_int < 0) {
 836                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 837                         return false;
 838                 }
 839                 replaywin = (unsigned)replaywin_int;
 840                 sptps_replaywin = replaywin;
 841         }
 842
 843 #ifndef DISABLE_LEGACY
 844         /* Generate packet encryption key */
 845
 846         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 847                 cipher = xstrdup("aes-256-cbc");
 848
 849         if(!strcasecmp(cipher, "none")) {
 850                 myself->incipher = NULL;
 851         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 852                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 853                 return false;
 854         }
 855
 856         free(cipher);
 857
 858         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 859
 860         /* Check if we want to use message authentication codes... */
 861
 862         int maclength = 4;
 863         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 864
 865         if(maclength < 0) {
 866                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 867                 return false;
 868         }
 869
 870         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 871                 digest = xstrdup("sha256");
 872
 873         if(!strcasecmp(digest, "none")) {
 874                 myself->indigest = NULL;
 875         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 876                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 877                 return false;
 878         }
 879
 880         free(digest);
 881 #endif
 882
 883         /* Compression */
 884
 885         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 886                 if(myself->incompression < 0 || myself->incompression > 11) {
 887                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 888                         return false;
 889                 }
 890         } else
 891                 myself->incompression = 0;
 892
 893         myself->connection->outcompression = 0;
 894
 895         /* Done */
 896
 897         myself->nexthop = myself;
 898         myself->via = myself;
 899         myself->status.reachable = true;
 900         myself->last_state_change = now.tv_sec;
 901         myself->status.sptps = experimental;
 902         node_add(myself);
 903
 904         graph();
 905
 906         load_all_nodes();
 907
 908         /* Open device */
 909
 910         devops = os_devops;
 911
 912         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 913                 if(!strcasecmp(type, "dummy"))
 914                         devops = dummy_devops;
 915                 else if(!strcasecmp(type, "raw_socket"))
 916                         devops = raw_socket_devops;
 917                 else if(!strcasecmp(type, "multicast"))
 918                         devops = multicast_devops;
 919                 else if(!strcasecmp(type, "fd"))
 920                         devops = fd_devops;
 921 #ifdef ENABLE_UML
 922                 else if(!strcasecmp(type, "uml"))
 923                         devops = uml_devops;
 924 #endif
 925 #ifdef ENABLE_VDE
 926                 else if(!strcasecmp(type, "vde"))
 927                         devops = vde_devops;
 928 #endif
 929                 free(type);
 930         }
 931
 932         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
 933
 934         if(!devops.setup())
 935                 return false;
 936
 937         if(device_fd >= 0)
 938                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 939
 940         /* Open sockets */
 941
 942         if(!do_detach && getenv("LISTEN_FDS")) {
 943                 sockaddr_t sa;
 944                 socklen_t salen;
 945
 946                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 947 #ifdef HAVE_UNSETENV
 948                 unsetenv("LISTEN_FDS");
 949 #endif
 950
 951                 if(listen_sockets > MAXSOCKETS) {
 952                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 953                         return false;
 954                 }
 955
 956                 for(int i = 0; i < listen_sockets; i++) {
 957                         salen = sizeof sa;
 958                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 959                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
 960                                 return false;
 961                         }
 962
 963 #ifdef FD_CLOEXEC
 964                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 965 #endif
 966
 967                         int udp_fd = setup_vpn_in_socket(&sa);
 968                         if(udp_fd < 0)
 969                                 return false;
 970
 971                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
 972                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
 973
 974                         if(debug_level >= DEBUG_CONNECTIONS) {
 975                                 hostname = sockaddr2hostname(&sa);
 976                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 977                                 free(hostname);
 978                         }
 979
 980                         memcpy(&listen_socket[i].sa, &sa, salen);
 981                 }
 982         } else {
 983                 listen_sockets = 0;
 984                 int cfgs = 0;
 985
 986                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 987                         cfgs++;
 988                         get_config_string(cfg, &address);
 989                         if(!add_listen_address(address, true))
 990                                 return false;
 991                 }
 992
 993                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 994                         cfgs++;
 995                         get_config_string(cfg, &address);
 996                         if(!add_listen_address(address, false))
 997                                 return false;
 998                 }
 999
1000                 if(!cfgs)
1001                         if(!add_listen_address(address, NULL))
1002                                 return false;
1003         }
1004
1005         if(!listen_sockets) {
1006                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1007                 return false;
1008         }
1009
1010         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1011
1012         if(!port_specified || atoi(myport) == 0) {
1013                 sockaddr_t sa;
1014                 socklen_t salen = sizeof sa;
1015                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1016                         free(myport);
1017                         sockaddr2str(&sa, NULL, &myport);
1018                         if(!myport)
1019                                 myport = xstrdup("655");
1020                 }
1021         }
1022
1023         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1024         myself->connection->hostname = xstrdup(myself->hostname);
1025
1026         char *upnp = NULL;
1027         get_config_string(lookup_config(config_tree, "UPnP"), &upnp);
1028         bool upnp_tcp = false;
1029         bool upnp_udp = false;
1030         if (upnp) {
1031                 if (!strcasecmp(upnp, "yes"))
1032                         upnp_tcp = upnp_udp = true;
1033                 else if (!strcasecmp(upnp, "udponly"))
1034                         upnp_udp = true;
1035                 free(upnp);
1036         }
1037         if (upnp_tcp || upnp_udp) {
1038 #ifdef HAVE_MINIUPNPC
1039                 upnp_init(upnp_tcp, upnp_udp);
1040 #else
1041                 logger(DEBUG_ALWAYS, LOG_WARNING, "UPnP was requested, but tinc isn't built with miniupnpc support!");
1042 #endif
1043         }
1044
1045         /* Done. */
1046
1047         last_config_check = now.tv_sec;
1048
1049         return true;
1050 }
1051
1052 /*
1053   initialize network
1054 */
1055 bool setup_network(void) {
1056         init_connections();
1057         init_subnets();
1058         init_nodes();
1059         init_edges();
1060         init_requests();
1061
1062         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1063                 if(pinginterval < 1) {
1064                         pinginterval = 86400;
1065                 }
1066         } else
1067                 pinginterval = 60;
1068
1069         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
1070                 pingtimeout = 5;
1071         if(pingtimeout < 1 || pingtimeout > pinginterval)
1072                 pingtimeout = pinginterval;
1073
1074         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
1075                 maxoutbufsize = 10 * MTU;
1076
1077         if(!setup_myself())
1078                 return false;
1079
1080         if(!init_control())
1081                 return false;
1082
1083         if (!device_standby)
1084                 device_enable();
1085
1086         /* Run subnet-up scripts for our own subnets */
1087
1088         subnet_update(myself, NULL, true);
1089
1090         return true;
1091 }
1092
1093 /*
1094   close all open network connections
1095 */
1096 void close_network_connections(void) {
1097         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1098                 next = node->next;
1099                 connection_t *c = node->data;
1100                 /* Keep control connections open until the end, so they know when we really terminated */
1101                 if(c->status.control)
1102                         c->socket = -1;
1103                 c->outgoing = NULL;
1104                 terminate_connection(c, false);
1105         }
1106
1107         if(outgoing_list)
1108                 list_delete_list(outgoing_list);
1109
1110         if(myself && myself->connection) {
1111                 subnet_update(myself, NULL, false);
1112                 connection_del(myself->connection);
1113         }
1114
1115         for(int i = 0; i < listen_sockets; i++) {
1116                 io_del(&listen_socket[i].tcp);
1117                 io_del(&listen_socket[i].udp);
1118                 close(listen_socket[i].tcp.fd);
1119                 close(listen_socket[i].udp.fd);
1120         }
1121
1122         exit_requests();
1123         exit_edges();
1124         exit_subnets();
1125         exit_nodes();
1126         exit_connections();
1127
1128         if (!device_standby)
1129                 device_disable();
1130
1131         free(myport);
1132
1133         if (device_fd >= 0)
1134                 io_del(&device_io);
1135         if (devops.close)
1136                 devops.close();
1137
1138         exit_control();
1139
1140         free(scriptextension);
1141         free(scriptinterpreter);
1142
1143         return;
1144 }