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 "crypto.h"
  32 #include "device.h"
  33 #include "digest.h"
  34 #include "ecdsa.h"
  35 #include "graph.h"
  36 #include "logger.h"
  37 #include "names.h"
  38 #include "net.h"
  39 #include "netutl.h"
  40 #include "process.h"
  41 #include "protocol.h"
  42 #include "route.h"
  43 #include "script.h"
  44 #include "subnet.h"
  45 #include "utils.h"
  46 #include "xalloc.h"
  47 #include "keys.h"
  48
  49 #ifdef HAVE_MINIUPNPC
  50 #include "upnp.h"
  51 #endif
  52
  53 char *myport;
  54 static io_t device_io;
  55 devops_t devops;
  56 bool device_standby = false;
  57
  58 char *proxyhost = NULL;
  59 char *proxyport = NULL;
  60 char *proxyuser = NULL;
  61 char *proxypass = NULL;
  62
  63 proxytype_t proxytype;
  64 bool autoconnect;
  65 bool disablebuggypeers;
  66
  67 char *scriptinterpreter;
  68 char *scriptextension;
  69
  70 bool node_read_ecdsa_public_key(node_t *n) {
  71         if(ecdsa_active(n->ecdsa)) {
  72                 return true;
  73         }
  74
  75         FILE *fp;
  76         char *pubname = NULL;
  77         char *p;
  78
  79         splay_tree_t config;
  80         init_configuration(&config);
  81
  82         if(!read_host_config(&config, n->name, true)) {
  83                 goto exit;
  84         }
  85
  86         /* First, check for simple Ed25519PublicKey statement */
  87
  88         if(get_config_string(lookup_config(&config, "Ed25519PublicKey"), &p)) {
  89                 n->ecdsa = ecdsa_set_base64_public_key(p);
  90                 free(p);
  91                 goto exit;
  92         }
  93
  94         /* Else, check for Ed25519PublicKeyFile statement and read it */
  95
  96         if(!get_config_string(lookup_config(&config, "Ed25519PublicKeyFile"), &pubname)) {
  97                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  98         }
  99
 100         fp = fopen(pubname, "r");
 101
 102         if(!fp) {
 103                 goto exit;
 104         }
 105
 106         n->ecdsa = ecdsa_read_pem_public_key(fp);
 107         fclose(fp);
 108
 109 exit:
 110         splay_empty_tree(&config);
 111         free(pubname);
 112         return n->ecdsa;
 113 }
 114
 115 static bool read_invitation_key(void) {
 116         FILE *fp;
 117         char fname[PATH_MAX];
 118
 119         if(invitation_key) {
 120                 ecdsa_free(invitation_key);
 121                 invitation_key = NULL;
 122         }
 123
 124         snprintf(fname, sizeof(fname), "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
 125
 126         fp = fopen(fname, "r");
 127
 128         if(fp) {
 129                 invitation_key = ecdsa_read_pem_private_key(fp);
 130                 fclose(fp);
 131
 132                 if(!invitation_key) {
 133                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 134                 }
 135         }
 136
 137         return invitation_key;
 138 }
 139
 140 #ifndef DISABLE_LEGACY
 141 static timeout_t keyexpire_timeout;
 142
 143 static void keyexpire_handler(void *data) {
 144         regenerate_key();
 145         timeout_set(data, &(struct timeval) {
 146                 keylifetime, jitter()
 147         });
 148 }
 149 #endif
 150
 151 void regenerate_key(void) {
 152         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 153         send_key_changed();
 154
 155         for splay_each(node_t, n, &node_tree) {
 156                 n->status.validkey_in = false;
 157         }
 158 }
 159
 160 void load_all_nodes(void) {
 161         DIR *dir;
 162         struct dirent *ent;
 163         char dname[PATH_MAX];
 164
 165         snprintf(dname, sizeof(dname), "%s" SLASH "hosts", confbase);
 166         dir = opendir(dname);
 167
 168         if(!dir) {
 169                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 170                 return;
 171         }
 172
 173         while((ent = readdir(dir))) {
 174                 if(!check_id(ent->d_name)) {
 175                         continue;
 176                 }
 177
 178                 node_t *n = lookup_node(ent->d_name);
 179
 180                 splay_tree_t config;
 181                 init_configuration(&config);
 182                 read_config_options(&config, ent->d_name);
 183                 read_host_config(&config, ent->d_name, true);
 184
 185                 if(!n) {
 186                         n = new_node();
 187                         n->name = xstrdup(ent->d_name);
 188                         node_add(n);
 189                 }
 190
 191                 if(strictsubnets) {
 192                         for(config_t *cfg = lookup_config(&config, "Subnet"); cfg; cfg = lookup_config_next(&config, cfg)) {
 193                                 subnet_t *s, *s2;
 194
 195                                 if(!get_config_subnet(cfg, &s)) {
 196                                         continue;
 197                                 }
 198
 199                                 if((s2 = lookup_subnet(n, s))) {
 200                                         s2->expires = -1;
 201                                         free(s);
 202                                 } else {
 203                                         subnet_add(n, s);
 204                                 }
 205                         }
 206                 }
 207
 208                 if(lookup_config(&config, "Address")) {
 209                         n->status.has_address = true;
 210                 }
 211
 212                 splay_empty_tree(&config);
 213         }
 214
 215         closedir(dir);
 216 }
 217
 218 char *get_name(void) {
 219         char *name = NULL;
 220         char *returned_name;
 221
 222         get_config_string(lookup_config(&config_tree, "Name"), &name);
 223
 224         if(!name) {
 225                 return NULL;
 226         }
 227
 228         returned_name = replace_name(name);
 229         free(name);
 230         return returned_name;
 231 }
 232
 233 bool setup_myself_reloadable(void) {
 234         free(scriptinterpreter);
 235         scriptinterpreter = NULL;
 236
 237         get_config_string(lookup_config(&config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 238
 239         free(scriptextension);
 240
 241         if(!get_config_string(lookup_config(&config_tree, "ScriptsExtension"), &scriptextension)) {
 242                 scriptextension = xstrdup("");
 243         }
 244
 245         char *proxy = NULL;
 246
 247         get_config_string(lookup_config(&config_tree, "Proxy"), &proxy);
 248
 249         if(proxy) {
 250                 char *space;
 251
 252                 if((space = strchr(proxy, ' '))) {
 253                         *space++ = 0;
 254                 }
 255
 256                 if(!strcasecmp(proxy, "none")) {
 257                         proxytype = PROXY_NONE;
 258                 } else if(!strcasecmp(proxy, "socks4")) {
 259                         proxytype = PROXY_SOCKS4;
 260                 } else if(!strcasecmp(proxy, "socks4a")) {
 261                         proxytype = PROXY_SOCKS4A;
 262                 } else if(!strcasecmp(proxy, "socks5")) {
 263                         proxytype = PROXY_SOCKS5;
 264                 } else if(!strcasecmp(proxy, "http")) {
 265                         proxytype = PROXY_HTTP;
 266                 } else if(!strcasecmp(proxy, "exec")) {
 267                         proxytype = PROXY_EXEC;
 268                 } else {
 269                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 270                         free(proxy);
 271                         return false;
 272                 }
 273
 274                 free(proxyhost);
 275                 proxyhost = NULL;
 276
 277                 free(proxyport);
 278                 proxyport = NULL;
 279
 280                 free(proxyuser);
 281                 proxyuser = NULL;
 282
 283                 free(proxypass);
 284                 proxypass = NULL;
 285
 286                 switch(proxytype) {
 287                 case PROXY_NONE:
 288                 default:
 289                         break;
 290
 291                 case PROXY_EXEC:
 292                         if(!space || !*space) {
 293                                 logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 294                                 free(proxy);
 295                                 return false;
 296                         }
 297
 298                         proxyhost = xstrdup(space);
 299                         break;
 300
 301                 case PROXY_SOCKS4:
 302                 case PROXY_SOCKS4A:
 303                 case PROXY_SOCKS5:
 304                 case PROXY_HTTP:
 305                         proxyhost = space;
 306
 307                         if(space && (space = strchr(space, ' '))) {
 308                                 *space++ = 0, proxyport = space;
 309                         }
 310
 311                         if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 312                                 logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 313                                 proxyport = NULL;
 314                                 proxyhost = NULL;
 315                                 free(proxy);
 316                                 return false;
 317                         }
 318
 319                         if(space && (space = strchr(space, ' '))) {
 320                                 *space++ = 0, proxyuser = space;
 321                         }
 322
 323                         if(space && (space = strchr(space, ' '))) {
 324                                 *space++ = 0, proxypass = space;
 325                         }
 326
 327                         proxyhost = xstrdup(proxyhost);
 328                         proxyport = xstrdup(proxyport);
 329
 330                         if(proxyuser && *proxyuser) {
 331                                 proxyuser = xstrdup(proxyuser);
 332                         }
 333
 334                         if(proxypass && *proxypass) {
 335                                 proxypass = xstrdup(proxypass);
 336                         }
 337
 338                         break;
 339                 }
 340
 341                 free(proxy);
 342         }
 343
 344         bool choice;
 345
 346         if(get_config_bool(lookup_config(&config_tree, "IndirectData"), &choice) && choice) {
 347                 myself->options |= OPTION_INDIRECT;
 348         }
 349
 350         if(get_config_bool(lookup_config(&config_tree, "TCPOnly"), &choice) && choice) {
 351                 myself->options |= OPTION_TCPONLY;
 352         }
 353
 354         if(myself->options & OPTION_TCPONLY) {
 355                 myself->options |= OPTION_INDIRECT;
 356         }
 357
 358         get_config_bool(lookup_config(&config_tree, "UDPDiscovery"), &udp_discovery);
 359         get_config_int(lookup_config(&config_tree, "UDPDiscoveryKeepaliveInterval"), &udp_discovery_keepalive_interval);
 360         get_config_int(lookup_config(&config_tree, "UDPDiscoveryInterval"), &udp_discovery_interval);
 361         get_config_int(lookup_config(&config_tree, "UDPDiscoveryTimeout"), &udp_discovery_timeout);
 362
 363         get_config_int(lookup_config(&config_tree, "MTUInfoInterval"), &mtu_info_interval);
 364         get_config_int(lookup_config(&config_tree, "UDPInfoInterval"), &udp_info_interval);
 365
 366         get_config_bool(lookup_config(&config_tree, "DirectOnly"), &directonly);
 367         get_config_bool(lookup_config(&config_tree, "LocalDiscovery"), &localdiscovery);
 368
 369         char *rmode = NULL;
 370
 371         if(get_config_string(lookup_config(&config_tree, "Mode"), &rmode)) {
 372                 if(!strcasecmp(rmode, "router")) {
 373                         routing_mode = RMODE_ROUTER;
 374                 } else if(!strcasecmp(rmode, "switch")) {
 375                         routing_mode = RMODE_SWITCH;
 376                 } else if(!strcasecmp(rmode, "hub")) {
 377                         routing_mode = RMODE_HUB;
 378                 } else {
 379                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 380                         free(rmode);
 381                         return false;
 382                 }
 383
 384                 free(rmode);
 385         }
 386
 387         char *fmode = NULL;
 388
 389         if(get_config_string(lookup_config(&config_tree, "Forwarding"), &fmode)) {
 390                 if(!strcasecmp(fmode, "off")) {
 391                         forwarding_mode = FMODE_OFF;
 392                 } else if(!strcasecmp(fmode, "internal")) {
 393                         forwarding_mode = FMODE_INTERNAL;
 394                 } else if(!strcasecmp(fmode, "kernel")) {
 395                         forwarding_mode = FMODE_KERNEL;
 396                 } else {
 397                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 398                         free(fmode);
 399                         return false;
 400                 }
 401
 402                 free(fmode);
 403         }
 404
 405         choice = !(myself->options & OPTION_TCPONLY);
 406         get_config_bool(lookup_config(&config_tree, "PMTUDiscovery"), &choice);
 407
 408         if(choice) {
 409                 myself->options |= OPTION_PMTU_DISCOVERY;
 410         }
 411
 412         choice = true;
 413         get_config_bool(lookup_config(&config_tree, "ClampMSS"), &choice);
 414
 415         if(choice) {
 416                 myself->options |= OPTION_CLAMP_MSS;
 417         }
 418
 419         get_config_bool(lookup_config(&config_tree, "PriorityInheritance"), &priorityinheritance);
 420         get_config_bool(lookup_config(&config_tree, "DecrementTTL"), &decrement_ttl);
 421
 422         char *bmode = NULL;
 423
 424         if(get_config_string(lookup_config(&config_tree, "Broadcast"), &bmode)) {
 425                 if(!strcasecmp(bmode, "no")) {
 426                         broadcast_mode = BMODE_NONE;
 427                 } else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst")) {
 428                         broadcast_mode = BMODE_MST;
 429                 } else if(!strcasecmp(bmode, "direct")) {
 430                         broadcast_mode = BMODE_DIRECT;
 431                 } else {
 432                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 433                         free(bmode);
 434                         return false;
 435                 }
 436
 437                 free(bmode);
 438         }
 439
 440         /* Delete all broadcast subnets before re-adding them */
 441
 442         for splay_each(subnet_t, s, &subnet_tree) {
 443                 if(!s->owner) {
 444                         splay_delete_node(&subnet_tree, node);
 445                 }
 446         }
 447
 448         const char *const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
 449
 450         for(size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
 451                 subnet_t *s = new_subnet();
 452
 453                 if(!str2net(s, DEFAULT_BROADCAST_SUBNETS[i])) {
 454                         abort();
 455                 }
 456
 457                 subnet_add(NULL, s);
 458         }
 459
 460         for(config_t *cfg = lookup_config(&config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(&config_tree, cfg)) {
 461                 subnet_t *s;
 462
 463                 if(!get_config_subnet(cfg, &s)) {
 464                         continue;
 465                 }
 466
 467                 subnet_add(NULL, s);
 468         }
 469
 470 #if !defined(IP_TOS)
 471
 472         if(priorityinheritance) {
 473                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv4 connections", "PriorityInheritance");
 474         }
 475
 476 #endif
 477
 478 #if !defined(IPV6_TCLASS)
 479
 480         if(priorityinheritance) {
 481                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv6 connections", "PriorityInheritance");
 482         }
 483
 484 #endif
 485
 486         if(!get_config_int(lookup_config(&config_tree, "MACExpire"), &macexpire)) {
 487                 macexpire = 600;
 488         }
 489
 490         if(get_config_int(lookup_config(&config_tree, "MaxTimeout"), &maxtimeout)) {
 491                 if(maxtimeout <= 0) {
 492                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 493                         return false;
 494                 }
 495         } else {
 496                 maxtimeout = 900;
 497         }
 498
 499         char *afname = NULL;
 500
 501         if(get_config_string(lookup_config(&config_tree, "AddressFamily"), &afname)) {
 502                 if(!strcasecmp(afname, "IPv4")) {
 503                         addressfamily = AF_INET;
 504                 } else if(!strcasecmp(afname, "IPv6")) {
 505                         addressfamily = AF_INET6;
 506                 } else if(!strcasecmp(afname, "any")) {
 507                         addressfamily = AF_UNSPEC;
 508                 } else {
 509                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 510                         free(afname);
 511                         return false;
 512                 }
 513
 514                 free(afname);
 515         }
 516
 517         get_config_bool(lookup_config(&config_tree, "Hostnames"), &hostnames);
 518
 519         if(!get_config_int(lookup_config(&config_tree, "KeyExpire"), &keylifetime)) {
 520                 keylifetime = 3600;
 521         }
 522
 523         if(!get_config_bool(lookup_config(&config_tree, "AutoConnect"), &autoconnect)) {
 524                 autoconnect = true;
 525         }
 526
 527         get_config_bool(lookup_config(&config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 528
 529         if(!get_config_int(lookup_config(&config_tree, "InvitationExpire"), &invitation_lifetime)) {
 530                 invitation_lifetime = 604800;        // 1 week
 531         }
 532
 533         read_invitation_key();
 534
 535         return true;
 536 }
 537
 538 /*
 539   Add listening sockets.
 540 */
 541 static bool add_listen_address(char *address, bool bindto) {
 542         char *port = myport;
 543
 544         if(address) {
 545                 char *space = strchr(address, ' ');
 546
 547                 if(space) {
 548                         *space++ = 0;
 549                         port = space;
 550                 }
 551
 552                 if(!strcmp(address, "*")) {
 553                         *address = 0;
 554                 }
 555         }
 556
 557         struct addrinfo *ai, hint = {0};
 558
 559         hint.ai_family = addressfamily;
 560
 561         hint.ai_socktype = SOCK_STREAM;
 562
 563         hint.ai_protocol = IPPROTO_TCP;
 564
 565         hint.ai_flags = AI_PASSIVE;
 566
 567 #if HAVE_DECL_RES_INIT
 568         res_init();
 569
 570 #endif
 571         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 572
 573         free(address);
 574
 575         if(err || !ai) {
 576                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 577                 return false;
 578         }
 579
 580         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 581                 // Ignore duplicate addresses
 582                 bool found = false;
 583
 584                 for(int i = 0; i < listen_sockets; i++)
 585                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 586                                 found = true;
 587                                 break;
 588                         }
 589
 590                 if(found) {
 591                         continue;
 592                 }
 593
 594                 if(listen_sockets >= MAXSOCKETS) {
 595                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 596                         freeaddrinfo(ai);
 597                         return false;
 598                 }
 599
 600                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 601
 602                 if(tcp_fd < 0) {
 603                         continue;
 604                 }
 605
 606                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 607
 608                 if(udp_fd < 0) {
 609                         close(tcp_fd);
 610                         continue;
 611                 }
 612
 613                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 614                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 615
 616                 if(debug_level >= DEBUG_CONNECTIONS) {
 617                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 618                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 619                         free(hostname);
 620                 }
 621
 622                 listen_socket[listen_sockets].bindto = bindto;
 623                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 624                 listen_sockets++;
 625         }
 626
 627         freeaddrinfo(ai);
 628         return true;
 629 }
 630
 631 void device_enable(void) {
 632         if(devops.enable) {
 633                 devops.enable();
 634         }
 635
 636         /* Run tinc-up script to further initialize the tap interface */
 637
 638         environment_t env;
 639         environment_init(&env);
 640         execute_script("tinc-up", &env);
 641         environment_exit(&env);
 642 }
 643
 644 void device_disable(void) {
 645         environment_t env;
 646         environment_init(&env);
 647         execute_script("tinc-down", &env);
 648         environment_exit(&env);
 649
 650         if(devops.disable) {
 651                 devops.disable();
 652         }
 653 }
 654
 655 /*
 656   Configure node_t myself and set up the local sockets (listen only)
 657 */
 658 static bool setup_myself(void) {
 659         char *name, *hostname, *type;
 660         char *address = NULL;
 661         bool port_specified = false;
 662
 663         if(!(name = get_name())) {
 664                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 665                 return false;
 666         }
 667
 668         myname = xstrdup(name);
 669         myself = new_node();
 670         myself->connection = new_connection();
 671         myself->name = name;
 672         myself->connection->name = xstrdup(name);
 673         read_host_config(&config_tree, name, true);
 674
 675         if(!get_config_string(lookup_config(&config_tree, "Port"), &myport)) {
 676                 myport = xstrdup("655");
 677         } else {
 678                 port_specified = true;
 679         }
 680
 681         myself->connection->options = 0;
 682         myself->connection->protocol_major = PROT_MAJOR;
 683         myself->connection->protocol_minor = PROT_MINOR;
 684
 685         myself->options |= PROT_MINOR << 24;
 686
 687 #ifdef DISABLE_LEGACY
 688         myself->connection->ecdsa = read_ecdsa_private_key(&config_tree, NULL);
 689         experimental = myself->connection->ecdsa != NULL;
 690
 691         if(!experimental) {
 692                 logger(DEBUG_ALWAYS, LOG_ERR, "No private key available, cannot start tinc!");
 693                 return false;
 694         }
 695
 696 #else
 697
 698         if(!get_config_bool(lookup_config(&config_tree, "ExperimentalProtocol"), &experimental)) {
 699                 myself->connection->ecdsa = read_ecdsa_private_key(&config_tree, NULL);
 700                 experimental = myself->connection->ecdsa != NULL;
 701
 702                 if(!experimental) {
 703                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 704                 }
 705         } else {
 706                 if(experimental) {
 707                         myself->connection->ecdsa = read_ecdsa_private_key(&config_tree, NULL);
 708
 709                         if(!myself->connection->ecdsa) {
 710                                 return false;
 711                         }
 712                 }
 713         }
 714
 715         myself->connection->rsa = read_rsa_private_key(&config_tree, NULL);
 716
 717         if(!myself->connection->rsa) {
 718                 if(experimental) {
 719                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for legacy protocol disabled.");
 720                 } else {
 721                         logger(DEBUG_ALWAYS, LOG_ERR, "No private keys available, cannot start tinc!");
 722                         return false;
 723                 }
 724         }
 725
 726 #endif
 727
 728         /* Ensure myport is numeric */
 729
 730         if(!atoi(myport)) {
 731                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 732                 sockaddr_t sa;
 733
 734                 if(!ai || !ai->ai_addr) {
 735                         return false;
 736                 }
 737
 738                 free(myport);
 739                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 740                 freeaddrinfo(ai);
 741                 sockaddr2str(&sa, NULL, &myport);
 742         }
 743
 744         /* Read in all the subnets specified in the host configuration file */
 745
 746         for(config_t *cfg = lookup_config(&config_tree, "Subnet"); cfg; cfg = lookup_config_next(&config_tree, cfg)) {
 747                 subnet_t *subnet;
 748
 749                 if(!get_config_subnet(cfg, &subnet)) {
 750                         return false;
 751                 }
 752
 753                 subnet_add(myself, subnet);
 754         }
 755
 756         /* Check some options */
 757
 758         if(!setup_myself_reloadable()) {
 759                 return false;
 760         }
 761
 762         get_config_bool(lookup_config(&config_tree, "StrictSubnets"), &strictsubnets);
 763         get_config_bool(lookup_config(&config_tree, "TunnelServer"), &tunnelserver);
 764         strictsubnets |= tunnelserver;
 765
 766         if(get_config_int(lookup_config(&config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 767                 if(max_connection_burst <= 0) {
 768                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 769                         return false;
 770                 }
 771         }
 772
 773         if(get_config_int(lookup_config(&config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 774                 if(udp_rcvbuf < 0) {
 775                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 776                         return false;
 777                 }
 778
 779                 udp_rcvbuf_warnings = true;
 780         }
 781
 782         if(get_config_int(lookup_config(&config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 783                 if(udp_sndbuf < 0) {
 784                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 785                         return false;
 786                 }
 787
 788                 udp_sndbuf_warnings = true;
 789         }
 790
 791         get_config_int(lookup_config(&config_tree, "FWMark"), &fwmark);
 792 #ifndef SO_MARK
 793
 794         if(fwmark) {
 795                 logger(DEBUG_ALWAYS, LOG_ERR, "FWMark not supported on this platform!");
 796                 return false;
 797         }
 798
 799 #endif
 800
 801         int replaywin_int;
 802
 803         if(get_config_int(lookup_config(&config_tree, "ReplayWindow"), &replaywin_int)) {
 804                 if(replaywin_int < 0) {
 805                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 806                         return false;
 807                 }
 808
 809                 replaywin = (unsigned)replaywin_int;
 810                 sptps_replaywin = replaywin;
 811         }
 812
 813 #ifndef DISABLE_LEGACY
 814         /* Generate packet encryption key */
 815
 816         char *cipher;
 817
 818         if(!get_config_string(lookup_config(&config_tree, "Cipher"), &cipher)) {
 819                 cipher = xstrdup("aes-256-cbc");
 820         }
 821
 822         if(!strcasecmp(cipher, "none")) {
 823                 myself->incipher = NULL;
 824         } else {
 825                 myself->incipher = cipher_alloc();
 826
 827                 if(!cipher_open_by_name(myself->incipher, cipher)) {
 828                         logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 829                         cipher_free(&myself->incipher);
 830                         free(cipher);
 831                         return false;
 832                 }
 833         }
 834
 835         free(cipher);
 836
 837         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval) {
 838                 keylifetime, jitter()
 839         });
 840
 841         /* Check if we want to use message authentication codes... */
 842
 843         int maclength = 4;
 844         get_config_int(lookup_config(&config_tree, "MACLength"), &maclength);
 845
 846         if(maclength < 0) {
 847                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 848                 return false;
 849         }
 850
 851         char *digest;
 852
 853         if(!get_config_string(lookup_config(&config_tree, "Digest"), &digest)) {
 854                 digest = xstrdup("sha256");
 855         }
 856
 857         if(!strcasecmp(digest, "none")) {
 858                 myself->indigest = NULL;
 859         } else {
 860                 myself->indigest = digest_alloc();
 861
 862                 if(!digest_open_by_name(myself->indigest, digest, maclength)) {
 863                         logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 864                         digest_free(&myself->indigest);
 865                         free(digest);
 866                         return false;
 867                 }
 868         }
 869
 870         free(digest);
 871 #endif
 872
 873         /* Compression */
 874         if(get_config_int(lookup_config(&config_tree, "Compression"), &myself->incompression)) {
 875                 switch(myself->incompression) {
 876                 case COMPRESS_LZ4:
 877 #ifdef HAVE_LZ4
 878                         break;
 879 #else
 880                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 881                         logger(DEBUG_ALWAYS, LOG_ERR, "LZ4 compression is unavailable on this node.");
 882                         return false;
 883 #endif
 884
 885                 case COMPRESS_LZO_HI:
 886                 case COMPRESS_LZO_LO:
 887 #ifdef HAVE_LZO
 888                         break;
 889 #else
 890                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 891                         logger(DEBUG_ALWAYS, LOG_ERR, "LZO compression is unavailable on this node.");
 892                         return false;
 893 #endif
 894
 895                 case COMPRESS_ZLIB_9:
 896                 case COMPRESS_ZLIB_8:
 897                 case COMPRESS_ZLIB_7:
 898                 case COMPRESS_ZLIB_6:
 899                 case COMPRESS_ZLIB_5:
 900                 case COMPRESS_ZLIB_4:
 901                 case COMPRESS_ZLIB_3:
 902                 case COMPRESS_ZLIB_2:
 903                 case COMPRESS_ZLIB_1:
 904 #ifdef HAVE_ZLIB
 905                         break;
 906 #else
 907                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 908                         logger(DEBUG_ALWAYS, LOG_ERR, "ZLIB compression is unavailable on this node.");
 909                         return false;
 910 #endif
 911
 912                 case COMPRESS_NONE:
 913                         break;
 914
 915                 default:
 916                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 917                         logger(DEBUG_ALWAYS, LOG_ERR, "Compression level %i is unrecognized by this node.", myself->incompression);
 918                         return false;
 919                 }
 920         } else {
 921                 myself->incompression = COMPRESS_NONE;
 922         }
 923
 924         myself->connection->outcompression = COMPRESS_NONE;
 925
 926         /* Done */
 927
 928         myself->nexthop = myself;
 929         myself->via = myself;
 930         myself->status.reachable = true;
 931         myself->last_state_change = now.tv_sec;
 932         myself->status.sptps = experimental;
 933         node_add(myself);
 934
 935         graph();
 936
 937         load_all_nodes();
 938
 939         /* Open device */
 940
 941         devops = os_devops;
 942
 943         if(get_config_string(lookup_config(&config_tree, "DeviceType"), &type)) {
 944                 if(!strcasecmp(type, "dummy")) {
 945                         devops = dummy_devops;
 946                 } else if(!strcasecmp(type, "raw_socket")) {
 947                         devops = raw_socket_devops;
 948                 } else if(!strcasecmp(type, "multicast")) {
 949                         devops = multicast_devops;
 950                 }
 951
 952 #ifdef HAVE_SYS_UN_H
 953                 else if(!strcasecmp(type, "fd")) {
 954                         devops = fd_devops;
 955                 }
 956
 957 #endif
 958 #ifdef ENABLE_UML
 959                 else if(!strcasecmp(type, "uml")) {
 960                         devops = uml_devops;
 961                 }
 962
 963 #endif
 964 #ifdef ENABLE_VDE
 965                 else if(!strcasecmp(type, "vde")) {
 966                         devops = vde_devops;
 967                 }
 968
 969 #endif
 970                 free(type);
 971         }
 972
 973         get_config_bool(lookup_config(&config_tree, "DeviceStandby"), &device_standby);
 974
 975         if(!devops.setup()) {
 976                 return false;
 977         }
 978
 979         if(device_fd >= 0) {
 980                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 981         }
 982
 983         /* Open sockets */
 984
 985         if(!do_detach && getenv("LISTEN_FDS")) {
 986                 sockaddr_t sa;
 987                 socklen_t salen;
 988
 989                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 990 #ifdef HAVE_UNSETENV
 991                 unsetenv("LISTEN_FDS");
 992 #endif
 993
 994                 if(listen_sockets > MAXSOCKETS) {
 995                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 996                         return false;
 997                 }
 998
 999                 for(int i = 0; i < listen_sockets; i++) {
1000                         salen = sizeof(sa);
1001
1002                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
1003                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
1004                                 return false;
1005                         }
1006
1007 #ifdef FD_CLOEXEC
1008                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
1009 #endif
1010
1011                         int udp_fd = setup_vpn_in_socket(&sa);
1012
1013                         if(udp_fd < 0) {
1014                                 return false;
1015                         }
1016
1017                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
1018                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
1019
1020                         if(debug_level >= DEBUG_CONNECTIONS) {
1021                                 hostname = sockaddr2hostname(&sa);
1022                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
1023                                 free(hostname);
1024                         }
1025
1026                         memcpy(&listen_socket[i].sa, &sa, salen);
1027                 }
1028         } else {
1029                 listen_sockets = 0;
1030                 int cfgs = 0;
1031
1032                 for(config_t *cfg = lookup_config(&config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(&config_tree, cfg)) {
1033                         cfgs++;
1034                         get_config_string(cfg, &address);
1035
1036                         if(!add_listen_address(address, true)) {
1037                                 return false;
1038                         }
1039                 }
1040
1041                 for(config_t *cfg = lookup_config(&config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(&config_tree, cfg)) {
1042                         cfgs++;
1043                         get_config_string(cfg, &address);
1044
1045                         if(!add_listen_address(address, false)) {
1046                                 return false;
1047                         }
1048                 }
1049
1050                 if(!cfgs)
1051                         if(!add_listen_address(address, NULL)) {
1052                                 return false;
1053                         }
1054         }
1055
1056         if(!listen_sockets) {
1057                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1058                 return false;
1059         }
1060
1061         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1062
1063         if(!port_specified || atoi(myport) == 0) {
1064                 sockaddr_t sa;
1065                 socklen_t salen = sizeof(sa);
1066
1067                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1068                         free(myport);
1069                         sockaddr2str(&sa, NULL, &myport);
1070
1071                         if(!myport) {
1072                                 myport = xstrdup("655");
1073                         }
1074                 }
1075         }
1076
1077         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1078         myself->connection->hostname = xstrdup(myself->hostname);
1079
1080         char *upnp = NULL;
1081         get_config_string(lookup_config(&config_tree, "UPnP"), &upnp);
1082         bool upnp_tcp = false;
1083         bool upnp_udp = false;
1084
1085         if(upnp) {
1086                 if(!strcasecmp(upnp, "yes")) {
1087                         upnp_tcp = upnp_udp = true;
1088                 } else if(!strcasecmp(upnp, "udponly")) {
1089                         upnp_udp = true;
1090                 }
1091
1092                 free(upnp);
1093         }
1094
1095         if(upnp_tcp || upnp_udp) {
1096 #ifdef HAVE_MINIUPNPC
1097                 upnp_init(upnp_tcp, upnp_udp);
1098 #else
1099                 logger(DEBUG_ALWAYS, LOG_WARNING, "UPnP was requested, but tinc isn't built with miniupnpc support!");
1100 #endif
1101         }
1102
1103         /* Done. */
1104
1105         last_config_check = now.tv_sec;
1106
1107         return true;
1108 }
1109
1110 /*
1111   initialize network
1112 */
1113 bool setup_network(void) {
1114         init_connections();
1115         init_subnets();
1116
1117         if(get_config_int(lookup_config(&config_tree, "PingInterval"), &pinginterval)) {
1118                 if(pinginterval < 1) {
1119                         pinginterval = 86400;
1120                 }
1121         } else {
1122                 pinginterval = 60;
1123         }
1124
1125         if(!get_config_int(lookup_config(&config_tree, "PingTimeout"), &pingtimeout)) {
1126                 pingtimeout = 5;
1127         }
1128
1129         if(pingtimeout < 1 || pingtimeout > pinginterval) {
1130                 pingtimeout = pinginterval;
1131         }
1132
1133         if(!get_config_int(lookup_config(&config_tree, "MaxOutputBufferSize"), &maxoutbufsize)) {
1134                 maxoutbufsize = 10 * MTU;
1135         }
1136
1137         if(!setup_myself()) {
1138                 return false;
1139         }
1140
1141         if(!init_control()) {
1142                 return false;
1143         }
1144
1145         if(!device_standby) {
1146                 device_enable();
1147         }
1148
1149         /* Run subnet-up scripts for our own subnets */
1150
1151         subnet_update(myself, NULL, true);
1152
1153         return true;
1154 }
1155
1156 /*
1157   close all open network connections
1158 */
1159 void close_network_connections(void) {
1160         for(list_node_t *node = connection_list.head, *next; node; node = next) {
1161                 next = node->next;
1162                 connection_t *c = node->data;
1163
1164                 /* Keep control connections open until the end, so they know when we really terminated */
1165                 if(c->status.control) {
1166                         c->socket = -1;
1167                 }
1168
1169                 c->outgoing = NULL;
1170                 terminate_connection(c, false);
1171         }
1172
1173         list_empty_list(&outgoing_list);
1174
1175         if(myself && myself->connection) {
1176                 subnet_update(myself, NULL, false);
1177                 free_connection(myself->connection);
1178         }
1179
1180         for(int i = 0; i < listen_sockets; i++) {
1181                 io_del(&listen_socket[i].tcp);
1182                 io_del(&listen_socket[i].udp);
1183                 close(listen_socket[i].tcp.fd);
1184                 close(listen_socket[i].udp.fd);
1185         }
1186
1187         exit_requests();
1188         exit_edges();
1189         exit_subnets();
1190         exit_nodes();
1191         exit_connections();
1192
1193         if(!device_standby) {
1194                 device_disable();
1195         }
1196
1197         free(myport);
1198
1199         if(device_fd >= 0) {
1200                 io_del(&device_io);
1201         }
1202
1203         if(devops.close) {
1204                 devops.close();
1205         }
1206
1207         exit_control();
1208
1209         free(scriptextension);
1210         free(scriptinterpreter);
1211
1212         return;
1213 }