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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2021 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_net.h"
  27 #include "conf.h"
  28 #include "connection.h"
  29 #include "compression.h"
  30 #include "control.h"
  31 #include "device.h"
  32 #include "digest.h"
  33 #include "ecdsa.h"
  34 #include "graph.h"
  35 #include "logger.h"
  36 #include "names.h"
  37 #include "net.h"
  38 #include "netutl.h"
  39 #include "process.h"
  40 #include "protocol.h"
  41 #include "route.h"
  42 #include "script.h"
  43 #include "subnet.h"
  44 #include "utils.h"
  45 #include "xalloc.h"
  46 #include "keys.h"
  47
  48 #ifdef HAVE_MINIUPNPC
  49 #include "upnp.h"
  50 #endif
  51
  52 char *myport;
  53 static io_t device_io;
  54 devops_t devops;
  55 bool device_standby = false;
  56
  57 char *proxyhost = NULL;
  58 char *proxyport = NULL;
  59 char *proxyuser = NULL;
  60 char *proxypass = NULL;
  61
  62 proxytype_t proxytype;
  63 bool autoconnect;
  64 bool disablebuggypeers;
  65
  66 char *scriptinterpreter;
  67 char *scriptextension;
  68
  69 bool node_read_ecdsa_public_key(node_t *n) {
  70         if(ecdsa_active(n->ecdsa)) {
  71                 return true;
  72         }
  73
  74         FILE *fp;
  75         char *pubname = NULL;
  76         char *p;
  77
  78         splay_tree_t config;
  79         init_configuration(&config);
  80
  81         if(!read_host_config(&config, n->name, true)) {
  82                 goto exit;
  83         }
  84
  85         /* First, check for simple Ed25519PublicKey statement */
  86
  87         if(get_config_string(lookup_config(&config, "Ed25519PublicKey"), &p)) {
  88                 n->ecdsa = ecdsa_set_base64_public_key(p);
  89                 free(p);
  90                 goto exit;
  91         }
  92
  93         /* Else, check for Ed25519PublicKeyFile statement and read it */
  94
  95         if(!get_config_string(lookup_config(&config, "Ed25519PublicKeyFile"), &pubname)) {
  96                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  97         }
  98
  99         fp = fopen(pubname, "r");
 100
 101         if(!fp) {
 102                 goto exit;
 103         }
 104
 105         n->ecdsa = ecdsa_read_pem_public_key(fp);
 106         fclose(fp);
 107
 108 exit:
 109         splay_empty_tree(&config);
 110         free(pubname);
 111         return n->ecdsa;
 112 }
 113
 114 static bool read_invitation_key(void) {
 115         FILE *fp;
 116         char fname[PATH_MAX];
 117
 118         if(invitation_key) {
 119                 ecdsa_free(invitation_key);
 120                 invitation_key = NULL;
 121         }
 122
 123         snprintf(fname, sizeof(fname), "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
 124
 125         fp = fopen(fname, "r");
 126
 127         if(fp) {
 128                 invitation_key = ecdsa_read_pem_private_key(fp);
 129                 fclose(fp);
 130
 131                 if(!invitation_key) {
 132                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 133                 }
 134         }
 135
 136         return invitation_key;
 137 }
 138
 139 #ifndef DISABLE_LEGACY
 140 static timeout_t keyexpire_timeout;
 141
 142 static void keyexpire_handler(void *data) {
 143         regenerate_key();
 144         timeout_set(data, &(struct timeval) {
 145                 keylifetime, rand() % 100000
 146         });
 147 }
 148 #endif
 149
 150 void regenerate_key(void) {
 151         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 152         send_key_changed();
 153
 154         for splay_each(node_t, n, &node_tree) {
 155                 n->status.validkey_in = false;
 156         }
 157 }
 158
 159 void load_all_nodes(void) {
 160         DIR *dir;
 161         struct dirent *ent;
 162         char dname[PATH_MAX];
 163
 164         snprintf(dname, sizeof(dname), "%s" SLASH "hosts", confbase);
 165         dir = opendir(dname);
 166
 167         if(!dir) {
 168                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 169                 return;
 170         }
 171
 172         while((ent = readdir(dir))) {
 173                 if(!check_id(ent->d_name)) {
 174                         continue;
 175                 }
 176
 177                 node_t *n = lookup_node(ent->d_name);
 178
 179                 splay_tree_t config;
 180                 init_configuration(&config);
 181                 read_config_options(&config, ent->d_name);
 182                 read_host_config(&config, ent->d_name, true);
 183
 184                 if(!n) {
 185                         n = new_node();
 186                         n->name = xstrdup(ent->d_name);
 187                         node_add(n);
 188                 }
 189
 190                 if(strictsubnets) {
 191                         for(config_t *cfg = lookup_config(&config, "Subnet"); cfg; cfg = lookup_config_next(&config, cfg)) {
 192                                 subnet_t *s, *s2;
 193
 194                                 if(!get_config_subnet(cfg, &s)) {
 195                                         continue;
 196                                 }
 197
 198                                 if((s2 = lookup_subnet(n, s))) {
 199                                         s2->expires = -1;
 200                                         free(s);
 201                                 } else {
 202                                         subnet_add(n, s);
 203                                 }
 204                         }
 205                 }
 206
 207                 if(lookup_config(&config, "Address")) {
 208                         n->status.has_address = true;
 209                 }
 210
 211                 splay_empty_tree(&config);
 212         }
 213
 214         closedir(dir);
 215 }
 216
 217 char *get_name(void) {
 218         char *name = NULL;
 219         char *returned_name;
 220
 221         get_config_string(lookup_config(&config_tree, "Name"), &name);
 222
 223         if(!name) {
 224                 return NULL;
 225         }
 226
 227         returned_name = replace_name(name);
 228         free(name);
 229         return returned_name;
 230 }
 231
 232 bool setup_myself_reloadable(void) {
 233         free(scriptinterpreter);
 234         scriptinterpreter = NULL;
 235
 236         get_config_string(lookup_config(&config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 237
 238         free(scriptextension);
 239
 240         if(!get_config_string(lookup_config(&config_tree, "ScriptsExtension"), &scriptextension)) {
 241                 scriptextension = xstrdup("");
 242         }
 243
 244         char *proxy = NULL;
 245
 246         get_config_string(lookup_config(&config_tree, "Proxy"), &proxy);
 247
 248         if(proxy) {
 249                 char *space;
 250
 251                 if((space = strchr(proxy, ' '))) {
 252                         *space++ = 0;
 253                 }
 254
 255                 if(!strcasecmp(proxy, "none")) {
 256                         proxytype = PROXY_NONE;
 257                 } else if(!strcasecmp(proxy, "socks4")) {
 258                         proxytype = PROXY_SOCKS4;
 259                 } else if(!strcasecmp(proxy, "socks4a")) {
 260                         proxytype = PROXY_SOCKS4A;
 261                 } else if(!strcasecmp(proxy, "socks5")) {
 262                         proxytype = PROXY_SOCKS5;
 263                 } else if(!strcasecmp(proxy, "http")) {
 264                         proxytype = PROXY_HTTP;
 265                 } else if(!strcasecmp(proxy, "exec")) {
 266                         proxytype = PROXY_EXEC;
 267                 } else {
 268                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 269                         free(proxy);
 270                         return false;
 271                 }
 272
 273                 free(proxyhost);
 274                 proxyhost = NULL;
 275
 276                 free(proxyport);
 277                 proxyport = NULL;
 278
 279                 free(proxyuser);
 280                 proxyuser = NULL;
 281
 282                 free(proxypass);
 283                 proxypass = NULL;
 284
 285                 switch(proxytype) {
 286                 case PROXY_NONE:
 287                 default:
 288                         break;
 289
 290                 case PROXY_EXEC:
 291                         if(!space || !*space) {
 292                                 logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 293                                 free(proxy);
 294                                 return false;
 295                         }
 296
 297                         proxyhost = xstrdup(space);
 298                         break;
 299
 300                 case PROXY_SOCKS4:
 301                 case PROXY_SOCKS4A:
 302                 case PROXY_SOCKS5:
 303                 case PROXY_HTTP:
 304                         proxyhost = space;
 305
 306                         if(space && (space = strchr(space, ' '))) {
 307                                 *space++ = 0, proxyport = space;
 308                         }
 309
 310                         if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 311                                 logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 312                                 proxyport = NULL;
 313                                 proxyhost = NULL;
 314                                 free(proxy);
 315                                 return false;
 316                         }
 317
 318                         if(space && (space = strchr(space, ' '))) {
 319                                 *space++ = 0, proxyuser = space;
 320                         }
 321
 322                         if(space && (space = strchr(space, ' '))) {
 323                                 *space++ = 0, proxypass = space;
 324                         }
 325
 326                         proxyhost = xstrdup(proxyhost);
 327                         proxyport = xstrdup(proxyport);
 328
 329                         if(proxyuser && *proxyuser) {
 330                                 proxyuser = xstrdup(proxyuser);
 331                         }
 332
 333                         if(proxypass && *proxypass) {
 334                                 proxypass = xstrdup(proxypass);
 335                         }
 336
 337                         break;
 338                 }
 339
 340                 free(proxy);
 341         }
 342
 343         bool choice;
 344
 345         if(get_config_bool(lookup_config(&config_tree, "IndirectData"), &choice) && choice) {
 346                 myself->options |= OPTION_INDIRECT;
 347         }
 348
 349         if(get_config_bool(lookup_config(&config_tree, "TCPOnly"), &choice) && choice) {
 350                 myself->options |= OPTION_TCPONLY;
 351         }
 352
 353         if(myself->options & OPTION_TCPONLY) {
 354                 myself->options |= OPTION_INDIRECT;
 355         }
 356
 357         get_config_bool(lookup_config(&config_tree, "UDPDiscovery"), &udp_discovery);
 358         get_config_int(lookup_config(&config_tree, "UDPDiscoveryKeepaliveInterval"), &udp_discovery_keepalive_interval);
 359         get_config_int(lookup_config(&config_tree, "UDPDiscoveryInterval"), &udp_discovery_interval);
 360         get_config_int(lookup_config(&config_tree, "UDPDiscoveryTimeout"), &udp_discovery_timeout);
 361
 362         get_config_int(lookup_config(&config_tree, "MTUInfoInterval"), &mtu_info_interval);
 363         get_config_int(lookup_config(&config_tree, "UDPInfoInterval"), &udp_info_interval);
 364
 365         get_config_bool(lookup_config(&config_tree, "DirectOnly"), &directonly);
 366         get_config_bool(lookup_config(&config_tree, "LocalDiscovery"), &localdiscovery);
 367
 368         char *rmode = NULL;
 369
 370         if(get_config_string(lookup_config(&config_tree, "Mode"), &rmode)) {
 371                 if(!strcasecmp(rmode, "router")) {
 372                         routing_mode = RMODE_ROUTER;
 373                 } else if(!strcasecmp(rmode, "switch")) {
 374                         routing_mode = RMODE_SWITCH;
 375                 } else if(!strcasecmp(rmode, "hub")) {
 376                         routing_mode = RMODE_HUB;
 377                 } else {
 378                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 379                         free(rmode);
 380                         return false;
 381                 }
 382
 383                 free(rmode);
 384         }
 385
 386         char *fmode = NULL;
 387
 388         if(get_config_string(lookup_config(&config_tree, "Forwarding"), &fmode)) {
 389                 if(!strcasecmp(fmode, "off")) {
 390                         forwarding_mode = FMODE_OFF;
 391                 } else if(!strcasecmp(fmode, "internal")) {
 392                         forwarding_mode = FMODE_INTERNAL;
 393                 } else if(!strcasecmp(fmode, "kernel")) {
 394                         forwarding_mode = FMODE_KERNEL;
 395                 } else {
 396                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 397                         free(fmode);
 398                         return false;
 399                 }
 400
 401                 free(fmode);
 402         }
 403
 404         choice = !(myself->options & OPTION_TCPONLY);
 405         get_config_bool(lookup_config(&config_tree, "PMTUDiscovery"), &choice);
 406
 407         if(choice) {
 408                 myself->options |= OPTION_PMTU_DISCOVERY;
 409         }
 410
 411         choice = true;
 412         get_config_bool(lookup_config(&config_tree, "ClampMSS"), &choice);
 413
 414         if(choice) {
 415                 myself->options |= OPTION_CLAMP_MSS;
 416         }
 417
 418         get_config_bool(lookup_config(&config_tree, "PriorityInheritance"), &priorityinheritance);
 419         get_config_bool(lookup_config(&config_tree, "DecrementTTL"), &decrement_ttl);
 420
 421         char *bmode = NULL;
 422
 423         if(get_config_string(lookup_config(&config_tree, "Broadcast"), &bmode)) {
 424                 if(!strcasecmp(bmode, "no")) {
 425                         broadcast_mode = BMODE_NONE;
 426                 } else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst")) {
 427                         broadcast_mode = BMODE_MST;
 428                 } else if(!strcasecmp(bmode, "direct")) {
 429                         broadcast_mode = BMODE_DIRECT;
 430                 } else {
 431                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 432                         free(bmode);
 433                         return false;
 434                 }
 435
 436                 free(bmode);
 437         }
 438
 439         /* Delete all broadcast subnets before re-adding them */
 440
 441         for splay_each(subnet_t, s, &subnet_tree) {
 442                 if(!s->owner) {
 443                         splay_delete_node(&subnet_tree, node);
 444                 }
 445         }
 446
 447         const char *const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
 448
 449         for(size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
 450                 subnet_t *s = new_subnet();
 451
 452                 if(!str2net(s, DEFAULT_BROADCAST_SUBNETS[i])) {
 453                         abort();
 454                 }
 455
 456                 subnet_add(NULL, s);
 457         }
 458
 459         for(config_t *cfg = lookup_config(&config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(&config_tree, cfg)) {
 460                 subnet_t *s;
 461
 462                 if(!get_config_subnet(cfg, &s)) {
 463                         continue;
 464                 }
 465
 466                 subnet_add(NULL, s);
 467         }
 468
 469 #if !defined(IP_TOS)
 470
 471         if(priorityinheritance) {
 472                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv4 connections", "PriorityInheritance");
 473         }
 474
 475 #endif
 476
 477 #if !defined(IPV6_TCLASS)
 478
 479         if(priorityinheritance) {
 480                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv6 connections", "PriorityInheritance");
 481         }
 482
 483 #endif
 484
 485         if(!get_config_int(lookup_config(&config_tree, "MACExpire"), &macexpire)) {
 486                 macexpire = 600;
 487         }
 488
 489         if(get_config_int(lookup_config(&config_tree, "MaxTimeout"), &maxtimeout)) {
 490                 if(maxtimeout <= 0) {
 491                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 492                         return false;
 493                 }
 494         } else {
 495                 maxtimeout = 900;
 496         }
 497
 498         char *afname = NULL;
 499
 500         if(get_config_string(lookup_config(&config_tree, "AddressFamily"), &afname)) {
 501                 if(!strcasecmp(afname, "IPv4")) {
 502                         addressfamily = AF_INET;
 503                 } else if(!strcasecmp(afname, "IPv6")) {
 504                         addressfamily = AF_INET6;
 505                 } else if(!strcasecmp(afname, "any")) {
 506                         addressfamily = AF_UNSPEC;
 507                 } else {
 508                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 509                         free(afname);
 510                         return false;
 511                 }
 512
 513                 free(afname);
 514         }
 515
 516         get_config_bool(lookup_config(&config_tree, "Hostnames"), &hostnames);
 517
 518         if(!get_config_int(lookup_config(&config_tree, "KeyExpire"), &keylifetime)) {
 519                 keylifetime = 3600;
 520         }
 521
 522         if(!get_config_bool(lookup_config(&config_tree, "AutoConnect"), &autoconnect)) {
 523                 autoconnect = true;
 524         }
 525
 526         get_config_bool(lookup_config(&config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 527
 528         if(!get_config_int(lookup_config(&config_tree, "InvitationExpire"), &invitation_lifetime)) {
 529                 invitation_lifetime = 604800;        // 1 week
 530         }
 531
 532         read_invitation_key();
 533
 534         return true;
 535 }
 536
 537 /*
 538   Add listening sockets.
 539 */
 540 static bool add_listen_address(char *address, bool bindto) {
 541         char *port = myport;
 542
 543         if(address) {
 544                 char *space = strchr(address, ' ');
 545
 546                 if(space) {
 547                         *space++ = 0;
 548                         port = space;
 549                 }
 550
 551                 if(!strcmp(address, "*")) {
 552                         *address = 0;
 553                 }
 554         }
 555
 556         struct addrinfo *ai, hint = {0};
 557
 558         hint.ai_family = addressfamily;
 559
 560         hint.ai_socktype = SOCK_STREAM;
 561
 562         hint.ai_protocol = IPPROTO_TCP;
 563
 564         hint.ai_flags = AI_PASSIVE;
 565
 566 #if HAVE_DECL_RES_INIT
 567         res_init();
 568
 569 #endif
 570         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 571
 572         free(address);
 573
 574         if(err || !ai) {
 575                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 576                 return false;
 577         }
 578
 579         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 580                 // Ignore duplicate addresses
 581                 bool found = false;
 582
 583                 for(int i = 0; i < listen_sockets; i++)
 584                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 585                                 found = true;
 586                                 break;
 587                         }
 588
 589                 if(found) {
 590                         continue;
 591                 }
 592
 593                 if(listen_sockets >= MAXSOCKETS) {
 594                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 595                         freeaddrinfo(ai);
 596                         return false;
 597                 }
 598
 599                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 600
 601                 if(tcp_fd < 0) {
 602                         continue;
 603                 }
 604
 605                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 606
 607                 if(udp_fd < 0) {
 608                         close(tcp_fd);
 609                         continue;
 610                 }
 611
 612                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 613                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 614
 615                 if(debug_level >= DEBUG_CONNECTIONS) {
 616                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 617                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 618                         free(hostname);
 619                 }
 620
 621                 listen_socket[listen_sockets].bindto = bindto;
 622                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 623                 listen_sockets++;
 624         }
 625
 626         freeaddrinfo(ai);
 627         return true;
 628 }
 629
 630 void device_enable(void) {
 631         if(devops.enable) {
 632                 devops.enable();
 633         }
 634
 635         /* Run tinc-up script to further initialize the tap interface */
 636
 637         environment_t env;
 638         environment_init(&env);
 639         execute_script("tinc-up", &env);
 640         environment_exit(&env);
 641 }
 642
 643 void device_disable(void) {
 644         environment_t env;
 645         environment_init(&env);
 646         execute_script("tinc-down", &env);
 647         environment_exit(&env);
 648
 649         if(devops.disable) {
 650                 devops.disable();
 651         }
 652 }
 653
 654 /*
 655   Configure node_t myself and set up the local sockets (listen only)
 656 */
 657 static bool setup_myself(void) {
 658         char *name, *hostname, *type;
 659         char *address = NULL;
 660         bool port_specified = false;
 661
 662         if(!(name = get_name())) {
 663                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 664                 return false;
 665         }
 666
 667         myname = xstrdup(name);
 668         myself = new_node();
 669         myself->connection = new_connection();
 670         myself->name = name;
 671         myself->connection->name = xstrdup(name);
 672         read_host_config(&config_tree, name, true);
 673
 674         if(!get_config_string(lookup_config(&config_tree, "Port"), &myport)) {
 675                 myport = xstrdup("655");
 676         } else {
 677                 port_specified = true;
 678         }
 679
 680         myself->connection->options = 0;
 681         myself->connection->protocol_major = PROT_MAJOR;
 682         myself->connection->protocol_minor = PROT_MINOR;
 683
 684         myself->options |= PROT_MINOR << 24;
 685
 686 #ifdef DISABLE_LEGACY
 687         myself->connection->ecdsa = read_ecdsa_private_key(&config_tree, NULL);
 688         experimental = myself->connection->ecdsa != NULL;
 689
 690         if(!experimental) {
 691                 logger(DEBUG_ALWAYS, LOG_ERR, "No private key available, cannot start tinc!");
 692                 return false;
 693         }
 694
 695 #else
 696
 697         if(!get_config_bool(lookup_config(&config_tree, "ExperimentalProtocol"), &experimental)) {
 698                 myself->connection->ecdsa = read_ecdsa_private_key(&config_tree, NULL);
 699                 experimental = myself->connection->ecdsa != NULL;
 700
 701                 if(!experimental) {
 702                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 703                 }
 704         } else {
 705                 if(experimental) {
 706                         myself->connection->ecdsa = read_ecdsa_private_key(&config_tree, NULL);
 707
 708                         if(!myself->connection->ecdsa) {
 709                                 return false;
 710                         }
 711                 }
 712         }
 713
 714         myself->connection->rsa = read_rsa_private_key(&config_tree, NULL);
 715
 716         if(!myself->connection->rsa) {
 717                 if(experimental) {
 718                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for legacy protocol disabled.");
 719                 } else {
 720                         logger(DEBUG_ALWAYS, LOG_ERR, "No private keys available, cannot start tinc!");
 721                         return false;
 722                 }
 723         }
 724
 725 #endif
 726
 727         /* Ensure myport is numeric */
 728
 729         if(!atoi(myport)) {
 730                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 731                 sockaddr_t sa;
 732
 733                 if(!ai || !ai->ai_addr) {
 734                         return false;
 735                 }
 736
 737                 free(myport);
 738                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 739                 freeaddrinfo(ai);
 740                 sockaddr2str(&sa, NULL, &myport);
 741         }
 742
 743         /* Read in all the subnets specified in the host configuration file */
 744
 745         for(config_t *cfg = lookup_config(&config_tree, "Subnet"); cfg; cfg = lookup_config_next(&config_tree, cfg)) {
 746                 subnet_t *subnet;
 747
 748                 if(!get_config_subnet(cfg, &subnet)) {
 749                         return false;
 750                 }
 751
 752                 subnet_add(myself, subnet);
 753         }
 754
 755         /* Check some options */
 756
 757         if(!setup_myself_reloadable()) {
 758                 return false;
 759         }
 760
 761         get_config_bool(lookup_config(&config_tree, "StrictSubnets"), &strictsubnets);
 762         get_config_bool(lookup_config(&config_tree, "TunnelServer"), &tunnelserver);
 763         strictsubnets |= tunnelserver;
 764
 765         if(get_config_int(lookup_config(&config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 766                 if(max_connection_burst <= 0) {
 767                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 768                         return false;
 769                 }
 770         }
 771
 772         if(get_config_int(lookup_config(&config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 773                 if(udp_rcvbuf < 0) {
 774                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 775                         return false;
 776                 }
 777
 778                 udp_rcvbuf_warnings = true;
 779         }
 780
 781         if(get_config_int(lookup_config(&config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 782                 if(udp_sndbuf < 0) {
 783                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 784                         return false;
 785                 }
 786
 787                 udp_sndbuf_warnings = true;
 788         }
 789
 790         get_config_int(lookup_config(&config_tree, "FWMark"), &fwmark);
 791 #ifndef SO_MARK
 792
 793         if(fwmark) {
 794                 logger(DEBUG_ALWAYS, LOG_ERR, "FWMark not supported on this platform!");
 795                 return false;
 796         }
 797
 798 #endif
 799
 800         int replaywin_int;
 801
 802         if(get_config_int(lookup_config(&config_tree, "ReplayWindow"), &replaywin_int)) {
 803                 if(replaywin_int < 0) {
 804                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 805                         return false;
 806                 }
 807
 808                 replaywin = (unsigned)replaywin_int;
 809                 sptps_replaywin = replaywin;
 810         }
 811
 812 #ifndef DISABLE_LEGACY
 813         /* Generate packet encryption key */
 814
 815         char *cipher;
 816
 817         if(!get_config_string(lookup_config(&config_tree, "Cipher"), &cipher)) {
 818                 cipher = xstrdup("aes-256-cbc");
 819         }
 820
 821         if(!strcasecmp(cipher, "none")) {
 822                 myself->incipher = NULL;
 823         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 824                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 825                 free(cipher);
 826                 return false;
 827         }
 828
 829         free(cipher);
 830
 831         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval) {
 832                 keylifetime, rand() % 100000
 833         });
 834
 835         /* Check if we want to use message authentication codes... */
 836
 837         int maclength = 4;
 838         get_config_int(lookup_config(&config_tree, "MACLength"), &maclength);
 839
 840         if(maclength < 0) {
 841                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 842                 return false;
 843         }
 844
 845         char *digest;
 846
 847         if(!get_config_string(lookup_config(&config_tree, "Digest"), &digest)) {
 848                 digest = xstrdup("sha256");
 849         }
 850
 851         if(!strcasecmp(digest, "none")) {
 852                 myself->indigest = NULL;
 853         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 854                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 855                 free(digest);
 856                 return false;
 857         }
 858
 859         free(digest);
 860 #endif
 861
 862         /* Compression */
 863         if(get_config_int(lookup_config(&config_tree, "Compression"), &myself->incompression)) {
 864                 switch(myself->incompression) {
 865                 case COMPRESS_LZ4:
 866 #ifdef HAVE_LZ4
 867                         break;
 868 #else
 869                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 870                         logger(DEBUG_ALWAYS, LOG_ERR, "LZ4 compression is unavailable on this node.");
 871                         return false;
 872 #endif
 873
 874                 case COMPRESS_LZO_HI:
 875                 case COMPRESS_LZO_LO:
 876 #ifdef HAVE_LZO
 877                         break;
 878 #else
 879                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 880                         logger(DEBUG_ALWAYS, LOG_ERR, "LZO compression is unavailable on this node.");
 881                         return false;
 882 #endif
 883
 884                 case COMPRESS_ZLIB_9:
 885                 case COMPRESS_ZLIB_8:
 886                 case COMPRESS_ZLIB_7:
 887                 case COMPRESS_ZLIB_6:
 888                 case COMPRESS_ZLIB_5:
 889                 case COMPRESS_ZLIB_4:
 890                 case COMPRESS_ZLIB_3:
 891                 case COMPRESS_ZLIB_2:
 892                 case COMPRESS_ZLIB_1:
 893 #ifdef HAVE_ZLIB
 894                         break;
 895 #else
 896                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 897                         logger(DEBUG_ALWAYS, LOG_ERR, "ZLIB compression is unavailable on this node.");
 898                         return false;
 899 #endif
 900
 901                 case COMPRESS_NONE:
 902                         break;
 903
 904                 default:
 905                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 906                         logger(DEBUG_ALWAYS, LOG_ERR, "Compression level %i is unrecognized by this node.", myself->incompression);
 907                         return false;
 908                 }
 909         } else {
 910                 myself->incompression = COMPRESS_NONE;
 911         }
 912
 913         myself->connection->outcompression = COMPRESS_NONE;
 914
 915         /* Done */
 916
 917         myself->nexthop = myself;
 918         myself->via = myself;
 919         myself->status.reachable = true;
 920         myself->last_state_change = now.tv_sec;
 921         myself->status.sptps = experimental;
 922         node_add(myself);
 923
 924         graph();
 925
 926         load_all_nodes();
 927
 928         /* Open device */
 929
 930         devops = os_devops;
 931
 932         if(get_config_string(lookup_config(&config_tree, "DeviceType"), &type)) {
 933                 if(!strcasecmp(type, "dummy")) {
 934                         devops = dummy_devops;
 935                 } else if(!strcasecmp(type, "raw_socket")) {
 936                         devops = raw_socket_devops;
 937                 } else if(!strcasecmp(type, "multicast")) {
 938                         devops = multicast_devops;
 939                 }
 940
 941 #ifdef HAVE_SYS_UN_H
 942                 else if(!strcasecmp(type, "fd")) {
 943                         devops = fd_devops;
 944                 }
 945
 946 #endif
 947 #ifdef ENABLE_UML
 948                 else if(!strcasecmp(type, "uml")) {
 949                         devops = uml_devops;
 950                 }
 951
 952 #endif
 953 #ifdef ENABLE_VDE
 954                 else if(!strcasecmp(type, "vde")) {
 955                         devops = vde_devops;
 956                 }
 957
 958 #endif
 959                 free(type);
 960         }
 961
 962         get_config_bool(lookup_config(&config_tree, "DeviceStandby"), &device_standby);
 963
 964         if(!devops.setup()) {
 965                 return false;
 966         }
 967
 968         if(device_fd >= 0) {
 969                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 970         }
 971
 972         /* Open sockets */
 973
 974         if(!do_detach && getenv("LISTEN_FDS")) {
 975                 sockaddr_t sa;
 976                 socklen_t salen;
 977
 978                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 979 #ifdef HAVE_UNSETENV
 980                 unsetenv("LISTEN_FDS");
 981 #endif
 982
 983                 if(listen_sockets > MAXSOCKETS) {
 984                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 985                         return false;
 986                 }
 987
 988                 for(int i = 0; i < listen_sockets; i++) {
 989                         salen = sizeof(sa);
 990
 991                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 992                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
 993                                 return false;
 994                         }
 995
 996 #ifdef FD_CLOEXEC
 997                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 998 #endif
 999
1000                         int udp_fd = setup_vpn_in_socket(&sa);
1001
1002                         if(udp_fd < 0) {
1003                                 return false;
1004                         }
1005
1006                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
1007                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
1008
1009                         if(debug_level >= DEBUG_CONNECTIONS) {
1010                                 hostname = sockaddr2hostname(&sa);
1011                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
1012                                 free(hostname);
1013                         }
1014
1015                         memcpy(&listen_socket[i].sa, &sa, salen);
1016                 }
1017         } else {
1018                 listen_sockets = 0;
1019                 int cfgs = 0;
1020
1021                 for(config_t *cfg = lookup_config(&config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(&config_tree, cfg)) {
1022                         cfgs++;
1023                         get_config_string(cfg, &address);
1024
1025                         if(!add_listen_address(address, true)) {
1026                                 return false;
1027                         }
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
1034                         if(!add_listen_address(address, false)) {
1035                                 return false;
1036                         }
1037                 }
1038
1039                 if(!cfgs)
1040                         if(!add_listen_address(address, NULL)) {
1041                                 return false;
1042                         }
1043         }
1044
1045         if(!listen_sockets) {
1046                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1047                 return false;
1048         }
1049
1050         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1051
1052         if(!port_specified || atoi(myport) == 0) {
1053                 sockaddr_t sa;
1054                 socklen_t salen = sizeof(sa);
1055
1056                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1057                         free(myport);
1058                         sockaddr2str(&sa, NULL, &myport);
1059
1060                         if(!myport) {
1061                                 myport = xstrdup("655");
1062                         }
1063                 }
1064         }
1065
1066         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1067         myself->connection->hostname = xstrdup(myself->hostname);
1068
1069         char *upnp = NULL;
1070         get_config_string(lookup_config(&config_tree, "UPnP"), &upnp);
1071         bool upnp_tcp = false;
1072         bool upnp_udp = false;
1073
1074         if(upnp) {
1075                 if(!strcasecmp(upnp, "yes")) {
1076                         upnp_tcp = upnp_udp = true;
1077                 } else if(!strcasecmp(upnp, "udponly")) {
1078                         upnp_udp = true;
1079                 }
1080
1081                 free(upnp);
1082         }
1083
1084         if(upnp_tcp || upnp_udp) {
1085 #ifdef HAVE_MINIUPNPC
1086                 upnp_init(upnp_tcp, upnp_udp);
1087 #else
1088                 logger(DEBUG_ALWAYS, LOG_WARNING, "UPnP was requested, but tinc isn't built with miniupnpc support!");
1089 #endif
1090         }
1091
1092         /* Done. */
1093
1094         last_config_check = now.tv_sec;
1095
1096         return true;
1097 }
1098
1099 /*
1100   initialize network
1101 */
1102 bool setup_network(void) {
1103         init_connections();
1104         init_subnets();
1105
1106         if(get_config_int(lookup_config(&config_tree, "PingInterval"), &pinginterval)) {
1107                 if(pinginterval < 1) {
1108                         pinginterval = 86400;
1109                 }
1110         } else {
1111                 pinginterval = 60;
1112         }
1113
1114         if(!get_config_int(lookup_config(&config_tree, "PingTimeout"), &pingtimeout)) {
1115                 pingtimeout = 5;
1116         }
1117
1118         if(pingtimeout < 1 || pingtimeout > pinginterval) {
1119                 pingtimeout = pinginterval;
1120         }
1121
1122         if(!get_config_int(lookup_config(&config_tree, "MaxOutputBufferSize"), &maxoutbufsize)) {
1123                 maxoutbufsize = 10 * MTU;
1124         }
1125
1126         if(!setup_myself()) {
1127                 return false;
1128         }
1129
1130         if(!init_control()) {
1131                 return false;
1132         }
1133
1134         if(!device_standby) {
1135                 device_enable();
1136         }
1137
1138         /* Run subnet-up scripts for our own subnets */
1139
1140         subnet_update(myself, NULL, true);
1141
1142         return true;
1143 }
1144
1145 /*
1146   close all open network connections
1147 */
1148 void close_network_connections(void) {
1149         for(list_node_t *node = connection_list.head, *next; node; node = next) {
1150                 next = node->next;
1151                 connection_t *c = node->data;
1152
1153                 /* Keep control connections open until the end, so they know when we really terminated */
1154                 if(c->status.control) {
1155                         c->socket = -1;
1156                 }
1157
1158                 c->outgoing = NULL;
1159                 terminate_connection(c, false);
1160         }
1161
1162         list_empty_list(&outgoing_list);
1163
1164         if(myself && myself->connection) {
1165                 subnet_update(myself, NULL, false);
1166                 free_connection(myself->connection);
1167         }
1168
1169         for(int i = 0; i < listen_sockets; i++) {
1170                 io_del(&listen_socket[i].tcp);
1171                 io_del(&listen_socket[i].udp);
1172                 close(listen_socket[i].tcp.fd);
1173                 close(listen_socket[i].udp.fd);
1174         }
1175
1176         exit_requests();
1177         exit_edges();
1178         exit_subnets();
1179         exit_nodes();
1180         exit_connections();
1181
1182         if(!device_standby) {
1183                 device_disable();
1184         }
1185
1186         free(myport);
1187
1188         if(device_fd >= 0) {
1189                 io_del(&device_io);
1190         }
1191
1192         if(devops.close) {
1193                 devops.close();
1194         }
1195
1196         exit_control();
1197
1198         free(scriptextension);
1199         free(scriptinterpreter);
1200
1201         return;
1202 }