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 "control.h"
  30 #include "device.h"
  31 #include "digest.h"
  32 #include "ecdsa.h"
  33 #include "graph.h"
  34 #include "logger.h"
  35 #include "names.h"
  36 #include "net.h"
  37 #include "netutl.h"
  38 #include "process.h"
  39 #include "protocol.h"
  40 #include "route.h"
  41 #include "script.h"
  42 #include "subnet.h"
  43 #include "utils.h"
  44 #include "xalloc.h"
  45 #include "keys.h"
  46
  47 #ifdef HAVE_MINIUPNPC
  48 #include "upnp.h"
  49 #endif
  50
  51 char *myport;
  52 static io_t device_io;
  53 devops_t devops;
  54 bool device_standby = false;
  55
  56 char *proxyhost = NULL;
  57 char *proxyport = NULL;
  58 char *proxyuser = NULL;
  59 char *proxypass = NULL;
  60
  61 proxytype_t proxytype;
  62 bool autoconnect;
  63 bool disablebuggypeers;
  64
  65 char *scriptinterpreter;
  66 char *scriptextension;
  67
  68 bool node_read_ecdsa_public_key(node_t *n) {
  69         if(ecdsa_active(n->ecdsa)) {
  70                 return true;
  71         }
  72
  73         splay_tree_t *config_tree;
  74         FILE *fp;
  75         char *pubname = NULL;
  76         char *p;
  77
  78         init_configuration(&config_tree);
  79
  80         if(!read_host_config(config_tree, n->name, true)) {
  81                 goto exit;
  82         }
  83
  84         /* First, check for simple Ed25519PublicKey statement */
  85
  86         if(get_config_string(lookup_config(config_tree, "Ed25519PublicKey"), &p)) {
  87                 n->ecdsa = ecdsa_set_base64_public_key(p);
  88                 free(p);
  89                 goto exit;
  90         }
  91
  92         /* Else, check for Ed25519PublicKeyFile statement and read it */
  93
  94         if(!get_config_string(lookup_config(config_tree, "Ed25519PublicKeyFile"), &pubname)) {
  95                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  96         }
  97
  98         fp = fopen(pubname, "r");
  99
 100         if(!fp) {
 101                 goto exit;
 102         }
 103
 104         n->ecdsa = ecdsa_read_pem_public_key(fp);
 105         fclose(fp);
 106
 107 exit:
 108         exit_configuration(&config_tree);
 109         free(pubname);
 110         return n->ecdsa;
 111 }
 112
 113 static bool read_invitation_key(void) {
 114         FILE *fp;
 115         char fname[PATH_MAX];
 116
 117         if(invitation_key) {
 118                 ecdsa_free(invitation_key);
 119                 invitation_key = NULL;
 120         }
 121
 122         snprintf(fname, sizeof(fname), "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
 123
 124         fp = fopen(fname, "r");
 125
 126         if(fp) {
 127                 invitation_key = ecdsa_read_pem_private_key(fp);
 128                 fclose(fp);
 129
 130                 if(!invitation_key) {
 131                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 132                 }
 133         }
 134
 135         return invitation_key;
 136 }
 137
 138 #ifndef DISABLE_LEGACY
 139 static timeout_t keyexpire_timeout;
 140
 141 static void keyexpire_handler(void *data) {
 142         regenerate_key();
 143         timeout_set(data, &(struct timeval) {
 144                 keylifetime, rand() % 100000
 145         });
 146 }
 147 #endif
 148
 149 void regenerate_key(void) {
 150         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 151         send_key_changed();
 152
 153         for splay_each(node_t, n, node_tree) {
 154                 n->status.validkey_in = false;
 155         }
 156 }
 157
 158 void load_all_nodes(void) {
 159         DIR *dir;
 160         struct dirent *ent;
 161         char dname[PATH_MAX];
 162
 163         snprintf(dname, sizeof(dname), "%s" SLASH "hosts", confbase);
 164         dir = opendir(dname);
 165
 166         if(!dir) {
 167                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 168                 return;
 169         }
 170
 171         while((ent = readdir(dir))) {
 172                 if(!check_id(ent->d_name)) {
 173                         continue;
 174                 }
 175
 176                 node_t *n = lookup_node(ent->d_name);
 177
 178                 splay_tree_t *config_tree;
 179                 init_configuration(&config_tree);
 180                 read_config_options(config_tree, ent->d_name);
 181                 read_host_config(config_tree, ent->d_name, true);
 182
 183                 if(!n) {
 184                         n = new_node();
 185                         n->name = xstrdup(ent->d_name);
 186                         node_add(n);
 187                 }
 188
 189                 if(strictsubnets) {
 190                         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 191                                 subnet_t *s, *s2;
 192
 193                                 if(!get_config_subnet(cfg, &s)) {
 194                                         continue;
 195                                 }
 196
 197                                 if((s2 = lookup_subnet(n, s))) {
 198                                         s2->expires = -1;
 199                                         free(s);
 200                                 } else {
 201                                         subnet_add(n, s);
 202                                 }
 203                         }
 204                 }
 205
 206                 if(lookup_config(config_tree, "Address")) {
 207                         n->status.has_address = true;
 208                 }
 209
 210                 exit_configuration(&config_tree);
 211         }
 212
 213         closedir(dir);
 214 }
 215
 216 char *get_name(void) {
 217         char *name = NULL;
 218         char *returned_name;
 219
 220         get_config_string(lookup_config(config_tree, "Name"), &name);
 221
 222         if(!name) {
 223                 return NULL;
 224         }
 225
 226         returned_name = replace_name(name);
 227         free(name);
 228         return returned_name;
 229 }
 230
 231 bool setup_myself_reloadable(void) {
 232         free(scriptinterpreter);
 233         scriptinterpreter = NULL;
 234
 235         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 236
 237         free(scriptextension);
 238
 239         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension)) {
 240                 scriptextension = xstrdup("");
 241         }
 242
 243         char *proxy = NULL;
 244
 245         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 246
 247         if(proxy) {
 248                 char *space;
 249
 250                 if((space = strchr(proxy, ' '))) {
 251                         *space++ = 0;
 252                 }
 253
 254                 if(!strcasecmp(proxy, "none")) {
 255                         proxytype = PROXY_NONE;
 256                 } else if(!strcasecmp(proxy, "socks4")) {
 257                         proxytype = PROXY_SOCKS4;
 258                 } else if(!strcasecmp(proxy, "socks4a")) {
 259                         proxytype = PROXY_SOCKS4A;
 260                 } else if(!strcasecmp(proxy, "socks5")) {
 261                         proxytype = PROXY_SOCKS5;
 262                 } else if(!strcasecmp(proxy, "http")) {
 263                         proxytype = PROXY_HTTP;
 264                 } else if(!strcasecmp(proxy, "exec")) {
 265                         proxytype = PROXY_EXEC;
 266                 } else {
 267                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 268                         free(proxy);
 269                         return false;
 270                 }
 271
 272                 free(proxyhost);
 273                 proxyhost = NULL;
 274
 275                 free(proxyport);
 276                 proxyport = NULL;
 277
 278                 free(proxyuser);
 279                 proxyuser = NULL;
 280
 281                 free(proxypass);
 282                 proxypass = NULL;
 283
 284                 switch(proxytype) {
 285                 case PROXY_NONE:
 286                 default:
 287                         break;
 288
 289                 case PROXY_EXEC:
 290                         if(!space || !*space) {
 291                                 logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 292                                 free(proxy);
 293                                 return false;
 294                         }
 295
 296                         proxyhost = xstrdup(space);
 297                         break;
 298
 299                 case PROXY_SOCKS4:
 300                 case PROXY_SOCKS4A:
 301                 case PROXY_SOCKS5:
 302                 case PROXY_HTTP:
 303                         proxyhost = space;
 304
 305                         if(space && (space = strchr(space, ' '))) {
 306                                 *space++ = 0, proxyport = space;
 307                         }
 308
 309                         if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 310                                 logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 311                                 proxyport = NULL;
 312                                 proxyhost = NULL;
 313                                 free(proxy);
 314                                 return false;
 315                         }
 316
 317                         if(space && (space = strchr(space, ' '))) {
 318                                 *space++ = 0, proxyuser = space;
 319                         }
 320
 321                         if(space && (space = strchr(space, ' '))) {
 322                                 *space++ = 0, proxypass = space;
 323                         }
 324
 325                         proxyhost = xstrdup(proxyhost);
 326                         proxyport = xstrdup(proxyport);
 327
 328                         if(proxyuser && *proxyuser) {
 329                                 proxyuser = xstrdup(proxyuser);
 330                         }
 331
 332                         if(proxypass && *proxypass) {
 333                                 proxypass = xstrdup(proxypass);
 334                         }
 335
 336                         break;
 337                 }
 338
 339                 free(proxy);
 340         }
 341
 342         bool choice;
 343
 344         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice) {
 345                 myself->options |= OPTION_INDIRECT;
 346         }
 347
 348         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice) {
 349                 myself->options |= OPTION_TCPONLY;
 350         }
 351
 352         if(myself->options & OPTION_TCPONLY) {
 353                 myself->options |= OPTION_INDIRECT;
 354         }
 355
 356         get_config_bool(lookup_config(config_tree, "UDPDiscovery"), &udp_discovery);
 357         get_config_int(lookup_config(config_tree, "UDPDiscoveryKeepaliveInterval"), &udp_discovery_keepalive_interval);
 358         get_config_int(lookup_config(config_tree, "UDPDiscoveryInterval"), &udp_discovery_interval);
 359         get_config_int(lookup_config(config_tree, "UDPDiscoveryTimeout"), &udp_discovery_timeout);
 360
 361         get_config_int(lookup_config(config_tree, "MTUInfoInterval"), &mtu_info_interval);
 362         get_config_int(lookup_config(config_tree, "UDPInfoInterval"), &udp_info_interval);
 363
 364         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 365         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 366
 367         char *rmode = NULL;
 368
 369         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 370                 if(!strcasecmp(rmode, "router")) {
 371                         routing_mode = RMODE_ROUTER;
 372                 } else if(!strcasecmp(rmode, "switch")) {
 373                         routing_mode = RMODE_SWITCH;
 374                 } else if(!strcasecmp(rmode, "hub")) {
 375                         routing_mode = RMODE_HUB;
 376                 } else {
 377                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 378                         free(rmode);
 379                         return false;
 380                 }
 381
 382                 free(rmode);
 383         }
 384
 385         char *fmode = NULL;
 386
 387         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 388                 if(!strcasecmp(fmode, "off")) {
 389                         forwarding_mode = FMODE_OFF;
 390                 } else if(!strcasecmp(fmode, "internal")) {
 391                         forwarding_mode = FMODE_INTERNAL;
 392                 } else if(!strcasecmp(fmode, "kernel")) {
 393                         forwarding_mode = FMODE_KERNEL;
 394                 } else {
 395                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 396                         free(fmode);
 397                         return false;
 398                 }
 399
 400                 free(fmode);
 401         }
 402
 403         choice = !(myself->options & OPTION_TCPONLY);
 404         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 405
 406         if(choice) {
 407                 myself->options |= OPTION_PMTU_DISCOVERY;
 408         }
 409
 410         choice = true;
 411         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 412
 413         if(choice) {
 414                 myself->options |= OPTION_CLAMP_MSS;
 415         }
 416
 417         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 418         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 419
 420         char *bmode = NULL;
 421
 422         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 423                 if(!strcasecmp(bmode, "no")) {
 424                         broadcast_mode = BMODE_NONE;
 425                 } else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst")) {
 426                         broadcast_mode = BMODE_MST;
 427                 } else if(!strcasecmp(bmode, "direct")) {
 428                         broadcast_mode = BMODE_DIRECT;
 429                 } else {
 430                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 431                         free(bmode);
 432                         return false;
 433                 }
 434
 435                 free(bmode);
 436         }
 437
 438         /* Delete all broadcast subnets before re-adding them */
 439
 440         for splay_each(subnet_t, s, subnet_tree) {
 441                 if(!s->owner) {
 442                         splay_delete_node(subnet_tree, node);
 443                 }
 444         }
 445
 446         const char *const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
 447
 448         for(size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
 449                 subnet_t *s = new_subnet();
 450
 451                 if(!str2net(s, DEFAULT_BROADCAST_SUBNETS[i])) {
 452                         abort();
 453                 }
 454
 455                 subnet_add(NULL, s);
 456         }
 457
 458         for(config_t *cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 459                 subnet_t *s;
 460
 461                 if(!get_config_subnet(cfg, &s)) {
 462                         continue;
 463                 }
 464
 465                 subnet_add(NULL, s);
 466         }
 467
 468 #if !defined(IP_TOS)
 469
 470         if(priorityinheritance) {
 471                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv4 connections", "PriorityInheritance");
 472         }
 473
 474 #endif
 475
 476 #if !defined(IPV6_TCLASS)
 477
 478         if(priorityinheritance) {
 479                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv6 connections", "PriorityInheritance");
 480         }
 481
 482 #endif
 483
 484         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire)) {
 485                 macexpire = 600;
 486         }
 487
 488         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 489                 if(maxtimeout <= 0) {
 490                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 491                         return false;
 492                 }
 493         } else {
 494                 maxtimeout = 900;
 495         }
 496
 497         char *afname = NULL;
 498
 499         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 500                 if(!strcasecmp(afname, "IPv4")) {
 501                         addressfamily = AF_INET;
 502                 } else if(!strcasecmp(afname, "IPv6")) {
 503                         addressfamily = AF_INET6;
 504                 } else if(!strcasecmp(afname, "any")) {
 505                         addressfamily = AF_UNSPEC;
 506                 } else {
 507                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 508                         free(afname);
 509                         return false;
 510                 }
 511
 512                 free(afname);
 513         }
 514
 515         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 516
 517         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime)) {
 518                 keylifetime = 3600;
 519         }
 520
 521         if(!get_config_bool(lookup_config(config_tree, "AutoConnect"), &autoconnect)) {
 522                 autoconnect = true;
 523         }
 524
 525         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 526
 527         if(!get_config_int(lookup_config(config_tree, "InvitationExpire"), &invitation_lifetime)) {
 528                 invitation_lifetime = 604800;        // 1 week
 529         }
 530
 531         read_invitation_key();
 532
 533         return true;
 534 }
 535
 536 /*
 537   Add listening sockets.
 538 */
 539 static bool add_listen_address(char *address, bool bindto) {
 540         char *port = myport;
 541
 542         if(address) {
 543                 char *space = strchr(address, ' ');
 544
 545                 if(space) {
 546                         *space++ = 0;
 547                         port = space;
 548                 }
 549
 550                 if(!strcmp(address, "*")) {
 551                         *address = 0;
 552                 }
 553         }
 554
 555         struct addrinfo *ai, hint = {0};
 556
 557         hint.ai_family = addressfamily;
 558
 559         hint.ai_socktype = SOCK_STREAM;
 560
 561         hint.ai_protocol = IPPROTO_TCP;
 562
 563         hint.ai_flags = AI_PASSIVE;
 564
 565 #if HAVE_DECL_RES_INIT
 566         res_init();
 567
 568 #endif
 569         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 570
 571         free(address);
 572
 573         if(err || !ai) {
 574                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 575                 return false;
 576         }
 577
 578         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 579                 // Ignore duplicate addresses
 580                 bool found = false;
 581
 582                 for(int i = 0; i < listen_sockets; i++)
 583                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 584                                 found = true;
 585                                 break;
 586                         }
 587
 588                 if(found) {
 589                         continue;
 590                 }
 591
 592                 if(listen_sockets >= MAXSOCKETS) {
 593                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 594                         freeaddrinfo(ai);
 595                         return false;
 596                 }
 597
 598                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 599
 600                 if(tcp_fd < 0) {
 601                         continue;
 602                 }
 603
 604                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 605
 606                 if(udp_fd < 0) {
 607                         close(tcp_fd);
 608                         continue;
 609                 }
 610
 611                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 612                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 613
 614                 if(debug_level >= DEBUG_CONNECTIONS) {
 615                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 616                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 617                         free(hostname);
 618                 }
 619
 620                 listen_socket[listen_sockets].bindto = bindto;
 621                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 622                 listen_sockets++;
 623         }
 624
 625         freeaddrinfo(ai);
 626         return true;
 627 }
 628
 629 void device_enable(void) {
 630         if(devops.enable) {
 631                 devops.enable();
 632         }
 633
 634         /* Run tinc-up script to further initialize the tap interface */
 635
 636         environment_t env;
 637         environment_init(&env);
 638         execute_script("tinc-up", &env);
 639         environment_exit(&env);
 640 }
 641
 642 void device_disable(void) {
 643         environment_t env;
 644         environment_init(&env);
 645         execute_script("tinc-down", &env);
 646         environment_exit(&env);
 647
 648         if(devops.disable) {
 649                 devops.disable();
 650         }
 651 }
 652
 653 /*
 654   Configure node_t myself and set up the local sockets (listen only)
 655 */
 656 static bool setup_myself(void) {
 657         char *name, *hostname, *type;
 658         char *address = NULL;
 659         bool port_specified = false;
 660
 661         if(!(name = get_name())) {
 662                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 663                 return false;
 664         }
 665
 666         myname = xstrdup(name);
 667         myself = new_node();
 668         myself->connection = new_connection();
 669         myself->name = name;
 670         myself->connection->name = xstrdup(name);
 671         read_host_config(config_tree, name, true);
 672
 673         if(!get_config_string(lookup_config(config_tree, "Port"), &myport)) {
 674                 myport = xstrdup("655");
 675         } else {
 676                 port_specified = true;
 677         }
 678
 679         myself->connection->options = 0;
 680         myself->connection->protocol_major = PROT_MAJOR;
 681         myself->connection->protocol_minor = PROT_MINOR;
 682
 683         myself->options |= PROT_MINOR << 24;
 684
 685 #ifdef DISABLE_LEGACY
 686         myself->connection->ecdsa = read_ecdsa_private_key(config_tree, NULL);
 687         experimental = myself->connection->ecdsa != NULL;
 688
 689         if(!experimental) {
 690                 logger(DEBUG_ALWAYS, LOG_ERR, "No private key available, cannot start tinc!");
 691                 return false;
 692         }
 693
 694 #else
 695
 696         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 697                 myself->connection->ecdsa = read_ecdsa_private_key(config_tree, NULL);
 698                 experimental = myself->connection->ecdsa != NULL;
 699
 700                 if(!experimental) {
 701                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 702                 }
 703         } else {
 704                 if(experimental) {
 705                         myself->connection->ecdsa = read_ecdsa_private_key(config_tree, NULL);
 706
 707                         if(!myself->connection->ecdsa) {
 708                                 return false;
 709                         }
 710                 }
 711         }
 712
 713         myself->connection->rsa = read_rsa_private_key(config_tree, NULL);
 714
 715         if(!myself->connection->rsa) {
 716                 if(experimental) {
 717                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for legacy protocol disabled.");
 718                 } else {
 719                         logger(DEBUG_ALWAYS, LOG_ERR, "No private keys available, cannot start tinc!");
 720                         return false;
 721                 }
 722         }
 723
 724 #endif
 725
 726         /* Ensure myport is numeric */
 727
 728         if(!atoi(myport)) {
 729                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 730                 sockaddr_t sa;
 731
 732                 if(!ai || !ai->ai_addr) {
 733                         return false;
 734                 }
 735
 736                 free(myport);
 737                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 738                 freeaddrinfo(ai);
 739                 sockaddr2str(&sa, NULL, &myport);
 740         }
 741
 742         /* Read in all the subnets specified in the host configuration file */
 743
 744         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 745                 subnet_t *subnet;
 746
 747                 if(!get_config_subnet(cfg, &subnet)) {
 748                         return false;
 749                 }
 750
 751                 subnet_add(myself, subnet);
 752         }
 753
 754         /* Check some options */
 755
 756         if(!setup_myself_reloadable()) {
 757                 return false;
 758         }
 759
 760         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 761         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 762         strictsubnets |= tunnelserver;
 763
 764         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 765                 if(max_connection_burst <= 0) {
 766                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 767                         return false;
 768                 }
 769         }
 770
 771         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 772                 if(udp_rcvbuf < 0) {
 773                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 774                         return false;
 775                 }
 776
 777                 udp_rcvbuf_warnings = true;
 778         }
 779
 780         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 781                 if(udp_sndbuf < 0) {
 782                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 783                         return false;
 784                 }
 785
 786                 udp_sndbuf_warnings = true;
 787         }
 788
 789         get_config_int(lookup_config(config_tree, "FWMark"), &fwmark);
 790 #ifndef SO_MARK
 791
 792         if(fwmark) {
 793                 logger(DEBUG_ALWAYS, LOG_ERR, "FWMark not supported on this platform!");
 794                 return false;
 795         }
 796
 797 #endif
 798
 799         int replaywin_int;
 800
 801         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 802                 if(replaywin_int < 0) {
 803                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 804                         return false;
 805                 }
 806
 807                 replaywin = (unsigned)replaywin_int;
 808                 sptps_replaywin = replaywin;
 809         }
 810
 811 #ifndef DISABLE_LEGACY
 812         /* Generate packet encryption key */
 813
 814         char *cipher;
 815
 816         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher)) {
 817                 cipher = xstrdup("aes-256-cbc");
 818         }
 819
 820         if(!strcasecmp(cipher, "none")) {
 821                 myself->incipher = NULL;
 822         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 823                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 824                 free(cipher);
 825                 return false;
 826         }
 827
 828         free(cipher);
 829
 830         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval) {
 831                 keylifetime, rand() % 100000
 832         });
 833
 834         /* Check if we want to use message authentication codes... */
 835
 836         int maclength = 4;
 837         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 838
 839         if(maclength < 0) {
 840                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 841                 return false;
 842         }
 843
 844         char *digest;
 845
 846         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest)) {
 847                 digest = xstrdup("sha256");
 848         }
 849
 850         if(!strcasecmp(digest, "none")) {
 851                 myself->indigest = NULL;
 852         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 853                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 854                 free(digest);
 855                 return false;
 856         }
 857
 858         free(digest);
 859 #endif
 860
 861         /* Compression */
 862
 863         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 864                 switch(myself->incompression) {
 865                 case 12:
 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 11:
 875                 case 10:
 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 9:
 885                 case 8:
 886                 case 7:
 887                 case 6:
 888                 case 5:
 889                 case 4:
 890                 case 3:
 891                 case 2:
 892                 case 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 0:
 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 = 0;
 911         }
 912
 913         myself->connection->outcompression = 0;
 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         init_nodes();
1106         init_edges();
1107         init_requests();
1108
1109         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1110                 if(pinginterval < 1) {
1111                         pinginterval = 86400;
1112                 }
1113         } else {
1114                 pinginterval = 60;
1115         }
1116
1117         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout)) {
1118                 pingtimeout = 5;
1119         }
1120
1121         if(pingtimeout < 1 || pingtimeout > pinginterval) {
1122                 pingtimeout = pinginterval;
1123         }
1124
1125         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize)) {
1126                 maxoutbufsize = 10 * MTU;
1127         }
1128
1129         if(!setup_myself()) {
1130                 return false;
1131         }
1132
1133         if(!init_control()) {
1134                 return false;
1135         }
1136
1137         if(!device_standby) {
1138                 device_enable();
1139         }
1140
1141         /* Run subnet-up scripts for our own subnets */
1142
1143         subnet_update(myself, NULL, true);
1144
1145         return true;
1146 }
1147
1148 /*
1149   close all open network connections
1150 */
1151 void close_network_connections(void) {
1152         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1153                 next = node->next;
1154                 connection_t *c = node->data;
1155
1156                 /* Keep control connections open until the end, so they know when we really terminated */
1157                 if(c->status.control) {
1158                         c->socket = -1;
1159                 }
1160
1161                 c->outgoing = NULL;
1162                 terminate_connection(c, false);
1163         }
1164
1165         if(outgoing_list) {
1166                 list_delete_list(outgoing_list);
1167         }
1168
1169         if(myself && myself->connection) {
1170                 subnet_update(myself, NULL, false);
1171                 free_connection(myself->connection);
1172         }
1173
1174         for(int i = 0; i < listen_sockets; i++) {
1175                 io_del(&listen_socket[i].tcp);
1176                 io_del(&listen_socket[i].udp);
1177                 close(listen_socket[i].tcp.fd);
1178                 close(listen_socket[i].udp.fd);
1179         }
1180
1181         exit_requests();
1182         exit_edges();
1183         exit_subnets();
1184         exit_nodes();
1185         exit_connections();
1186
1187         if(!device_standby) {
1188                 device_disable();
1189         }
1190
1191         free(myport);
1192
1193         if(device_fd >= 0) {
1194                 io_del(&device_io);
1195         }
1196
1197         if(devops.close) {
1198                 devops.close();
1199         }
1200
1201         exit_control();
1202
1203         free(scriptextension);
1204         free(scriptinterpreter);
1205
1206         return;
1207 }