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 "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 ports_t 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 // Get the port that `from_fd` is listening on, and assign it to
 539 // `sa` if `sa` has a dynamically allocated (zero) port.
 540 static bool assign_static_port(sockaddr_t *sa, int from_fd) {
 541         // We cannot get a port from a bad FD. Bail out.
 542         if(from_fd <= 0) {
 543                 return false;
 544         }
 545
 546         int port = get_bound_port(from_fd);
 547
 548         if(!port) {
 549                 return false;
 550         }
 551
 552         // If the port is non-zero, don't reassign it as it's already static.
 553         switch(sa->sa.sa_family) {
 554         case AF_INET:
 555                 if(!sa->in.sin_port) {
 556                         sa->in.sin_port = htons(port);
 557                 }
 558
 559                 return true;
 560
 561         case AF_INET6:
 562                 if(!sa->in6.sin6_port) {
 563                         sa->in6.sin6_port = htons(port);
 564                 }
 565
 566                 return true;
 567
 568         default:
 569                 logger(DEBUG_ALWAYS, LOG_ERR, "Unknown address family 0x%x", sa->sa.sa_family);
 570                 return false;
 571         }
 572 }
 573
 574 typedef int (*bind_fn_t)(const sockaddr_t *);
 575
 576 static int bind_reusing_port(const sockaddr_t *sa, int from_fd, bind_fn_t setup) {
 577         sockaddr_t reuse_sa;
 578         memcpy(&reuse_sa, sa, SALEN(sa->sa));
 579
 580         int fd = -1;
 581
 582         // Check if the address we've been passed here is using port 0.
 583         // If it is, try to get an actual port from an already bound socket, and reuse it here.
 584         if(assign_static_port(&reuse_sa, from_fd)) {
 585                 fd = setup(&reuse_sa);
 586         }
 587
 588         // If we're binding to a hardcoded non-zero port, or no socket is listening yet,
 589         // or binding failed, try the original address.
 590         if(fd < 0) {
 591                 fd = setup(sa);
 592         }
 593
 594         return fd;
 595 }
 596
 597 /*
 598   Add listening sockets.
 599 */
 600 static bool add_listen_address(char *address, bool bindto) {
 601         char *port = myport.tcp;
 602
 603         if(address) {
 604                 char *space = strchr(address, ' ');
 605
 606                 if(space) {
 607                         *space++ = 0;
 608                         port = space;
 609                 }
 610
 611                 if(!strcmp(address, "*")) {
 612                         *address = 0;
 613                 }
 614         }
 615
 616         struct addrinfo *ai, hint = {0};
 617
 618         hint.ai_family = addressfamily;
 619
 620         hint.ai_socktype = SOCK_STREAM;
 621
 622         hint.ai_protocol = IPPROTO_TCP;
 623
 624         hint.ai_flags = AI_PASSIVE;
 625
 626 #if HAVE_DECL_RES_INIT
 627         res_init();
 628
 629 #endif
 630         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 631
 632         free(address);
 633
 634         if(err || !ai) {
 635                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 636                 return false;
 637         }
 638
 639         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 640                 // Ignore duplicate addresses
 641                 bool found = false;
 642
 643                 for(int i = 0; i < listen_sockets; i++)
 644                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 645                                 found = true;
 646                                 break;
 647                         }
 648
 649                 if(found) {
 650                         continue;
 651                 }
 652
 653                 if(listen_sockets >= MAXSOCKETS) {
 654                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 655                         freeaddrinfo(ai);
 656                         return false;
 657                 }
 658
 659                 const sockaddr_t *sa = (sockaddr_t *) aip->ai_addr;
 660                 int from_fd = listen_socket[0].tcp.fd;
 661
 662                 // If we're binding to a dynamically allocated (zero) port, try to get the actual
 663                 // port of the first TCP socket, and use it for this one. If that succeeds, our
 664                 // tincd instance will use the same port for all addresses it listens on.
 665                 int tcp_fd = bind_reusing_port(sa, from_fd, setup_listen_socket);
 666
 667                 if(tcp_fd < 0) {
 668                         continue;
 669                 }
 670
 671                 // If we just successfully bound the first socket, use it for the UDP procedure below.
 672                 // Otherwise, keep using the socket we've obtained from listen_socket[0].
 673                 if(!from_fd) {
 674                         from_fd = tcp_fd;
 675                 }
 676
 677                 int udp_fd = bind_reusing_port(sa, from_fd, setup_vpn_in_socket);
 678
 679                 if(udp_fd < 0) {
 680                         closesocket(tcp_fd);
 681                         continue;
 682                 }
 683
 684                 listen_socket_t *sock = &listen_socket[listen_sockets];
 685                 io_add(&sock->tcp, handle_new_meta_connection, sock, tcp_fd, IO_READ);
 686                 io_add(&sock->udp, handle_incoming_vpn_data, sock, udp_fd, IO_READ);
 687
 688                 if(debug_level >= DEBUG_CONNECTIONS) {
 689                         int tcp_port = get_bound_port(tcp_fd);
 690                         char *hostname = NULL;
 691                         sockaddr2str(sa, &hostname, NULL);
 692                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s port %d", hostname, tcp_port);
 693                         free(hostname);
 694                 }
 695
 696                 sock->bindto = bindto;
 697                 memcpy(&sock->sa, aip->ai_addr, aip->ai_addrlen);
 698                 listen_sockets++;
 699         }
 700
 701         freeaddrinfo(ai);
 702         return true;
 703 }
 704
 705 void device_enable(void) {
 706         if(devops.enable) {
 707                 devops.enable();
 708         }
 709
 710         /* Run tinc-up script to further initialize the tap interface */
 711
 712         environment_t env;
 713         environment_init(&env);
 714         execute_script("tinc-up", &env);
 715         environment_exit(&env);
 716 }
 717
 718 void device_disable(void) {
 719         environment_t env;
 720         environment_init(&env);
 721         execute_script("tinc-down", &env);
 722         environment_exit(&env);
 723
 724         if(devops.disable) {
 725                 devops.disable();
 726         }
 727 }
 728
 729 /*
 730   Configure node_t myself and set up the local sockets (listen only)
 731 */
 732 static bool setup_myself(void) {
 733         char *name, *type;
 734         char *address = NULL;
 735         bool port_specified = false;
 736
 737         if(!(name = get_name())) {
 738                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 739                 return false;
 740         }
 741
 742         myname = xstrdup(name);
 743         myself = new_node();
 744         myself->connection = new_connection();
 745         myself->name = name;
 746         myself->connection->name = xstrdup(name);
 747         read_host_config(&config_tree, name, true);
 748
 749         if(!get_config_string(lookup_config(&config_tree, "Port"), &myport.tcp)) {
 750                 myport.tcp = xstrdup("655");
 751         } else {
 752                 port_specified = true;
 753         }
 754
 755         myport.udp = xstrdup(myport.tcp);
 756
 757         myself->connection->options = 0;
 758         myself->connection->protocol_major = PROT_MAJOR;
 759         myself->connection->protocol_minor = PROT_MINOR;
 760
 761         myself->options |= PROT_MINOR << 24;
 762
 763 #ifdef DISABLE_LEGACY
 764         myself->connection->ecdsa = read_ecdsa_private_key(&config_tree, NULL);
 765         experimental = myself->connection->ecdsa != NULL;
 766
 767         if(!experimental) {
 768                 logger(DEBUG_ALWAYS, LOG_ERR, "No private key available, cannot start tinc!");
 769                 return false;
 770         }
 771
 772 #else
 773
 774         if(!get_config_bool(lookup_config(&config_tree, "ExperimentalProtocol"), &experimental)) {
 775                 myself->connection->ecdsa = read_ecdsa_private_key(&config_tree, NULL);
 776                 experimental = myself->connection->ecdsa != NULL;
 777
 778                 if(!experimental) {
 779                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 780                 }
 781         } else {
 782                 if(experimental) {
 783                         myself->connection->ecdsa = read_ecdsa_private_key(&config_tree, NULL);
 784
 785                         if(!myself->connection->ecdsa) {
 786                                 return false;
 787                         }
 788                 }
 789         }
 790
 791         rsa_t *rsa = read_rsa_private_key(&config_tree, NULL);
 792
 793         if(rsa) {
 794                 myself->connection->legacy = new_legacy_ctx(rsa);
 795         } else {
 796                 if(experimental) {
 797                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for legacy protocol disabled.");
 798                 } else {
 799                         logger(DEBUG_ALWAYS, LOG_ERR, "No private keys available, cannot start tinc!");
 800                         return false;
 801                 }
 802         }
 803
 804 #endif
 805
 806         /* Ensure myport is numeric */
 807         if(!is_decimal(myport.tcp)) {
 808                 uint16_t port = service_to_port(myport.tcp);
 809
 810                 if(!port) {
 811                         return false;
 812                 }
 813
 814                 free(myport.tcp);
 815                 myport.tcp = int_to_str(port);
 816
 817                 free(myport.udp);
 818                 myport.udp = xstrdup(myport.tcp);
 819         }
 820
 821         /* Read in all the subnets specified in the host configuration file */
 822
 823         for(config_t *cfg = lookup_config(&config_tree, "Subnet"); cfg; cfg = lookup_config_next(&config_tree, cfg)) {
 824                 subnet_t *subnet;
 825
 826                 if(!get_config_subnet(cfg, &subnet)) {
 827                         return false;
 828                 }
 829
 830                 subnet_add(myself, subnet);
 831         }
 832
 833         /* Check some options */
 834
 835         if(!setup_myself_reloadable()) {
 836                 return false;
 837         }
 838
 839         get_config_bool(lookup_config(&config_tree, "StrictSubnets"), &strictsubnets);
 840         get_config_bool(lookup_config(&config_tree, "TunnelServer"), &tunnelserver);
 841         strictsubnets |= tunnelserver;
 842
 843         if(get_config_int(lookup_config(&config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 844                 if(max_connection_burst <= 0) {
 845                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 846                         return false;
 847                 }
 848         }
 849
 850         if(get_config_int(lookup_config(&config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 851                 if(udp_rcvbuf < 0) {
 852                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 853                         return false;
 854                 }
 855
 856                 udp_rcvbuf_warnings = true;
 857         }
 858
 859         if(get_config_int(lookup_config(&config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 860                 if(udp_sndbuf < 0) {
 861                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 862                         return false;
 863                 }
 864
 865                 udp_sndbuf_warnings = true;
 866         }
 867
 868         get_config_int(lookup_config(&config_tree, "FWMark"), &fwmark);
 869 #ifndef SO_MARK
 870
 871         if(fwmark) {
 872                 logger(DEBUG_ALWAYS, LOG_ERR, "FWMark not supported on this platform!");
 873                 return false;
 874         }
 875
 876 #endif
 877
 878         int replaywin_int;
 879
 880         if(get_config_int(lookup_config(&config_tree, "ReplayWindow"), &replaywin_int)) {
 881                 if(replaywin_int < 0) {
 882                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 883                         return false;
 884                 }
 885
 886                 replaywin = (unsigned)replaywin_int;
 887                 sptps_replaywin = replaywin;
 888         }
 889
 890 #ifndef DISABLE_LEGACY
 891         /* Generate packet encryption key */
 892
 893         char *cipher;
 894
 895         if(!get_config_string(lookup_config(&config_tree, "Cipher"), &cipher)) {
 896                 cipher = xstrdup("aes-256-cbc");
 897         }
 898
 899         if(!strcasecmp(cipher, "none")) {
 900                 myself->incipher = NULL;
 901         } else {
 902                 myself->incipher = cipher_alloc();
 903
 904                 if(!cipher_open_by_name(myself->incipher, cipher)) {
 905                         logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 906                         cipher_free(&myself->incipher);
 907                         free(cipher);
 908                         return false;
 909                 }
 910         }
 911
 912         free(cipher);
 913
 914         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval) {
 915                 keylifetime, jitter()
 916         });
 917
 918         /* Check if we want to use message authentication codes... */
 919
 920         int maclength = 4;
 921         get_config_int(lookup_config(&config_tree, "MACLength"), &maclength);
 922
 923         if(maclength < 0) {
 924                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 925                 return false;
 926         }
 927
 928         char *digest;
 929
 930         if(!get_config_string(lookup_config(&config_tree, "Digest"), &digest)) {
 931                 digest = xstrdup("sha256");
 932         }
 933
 934         if(!strcasecmp(digest, "none")) {
 935                 myself->indigest = NULL;
 936         } else {
 937                 myself->indigest = digest_alloc();
 938
 939                 if(!digest_open_by_name(myself->indigest, digest, maclength)) {
 940                         logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 941                         digest_free(&myself->indigest);
 942                         free(digest);
 943                         return false;
 944                 }
 945         }
 946
 947         free(digest);
 948 #endif
 949
 950         /* Compression */
 951         int incompression = 0;
 952
 953         if(get_config_int(lookup_config(&config_tree, "Compression"), &incompression)) {
 954                 myself->incompression = incompression;
 955
 956                 switch(myself->incompression) {
 957                 case COMPRESS_LZ4:
 958 #ifdef HAVE_LZ4
 959                         break;
 960 #else
 961                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 962                         logger(DEBUG_ALWAYS, LOG_ERR, "LZ4 compression is unavailable on this node.");
 963                         return false;
 964 #endif
 965
 966                 case COMPRESS_LZO_HI:
 967                 case COMPRESS_LZO_LO:
 968 #ifdef HAVE_LZO
 969                         break;
 970 #else
 971                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 972                         logger(DEBUG_ALWAYS, LOG_ERR, "LZO compression is unavailable on this node.");
 973                         return false;
 974 #endif
 975
 976                 case COMPRESS_ZLIB_9:
 977                 case COMPRESS_ZLIB_8:
 978                 case COMPRESS_ZLIB_7:
 979                 case COMPRESS_ZLIB_6:
 980                 case COMPRESS_ZLIB_5:
 981                 case COMPRESS_ZLIB_4:
 982                 case COMPRESS_ZLIB_3:
 983                 case COMPRESS_ZLIB_2:
 984                 case COMPRESS_ZLIB_1:
 985 #ifdef HAVE_ZLIB
 986                         break;
 987 #else
 988                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 989                         logger(DEBUG_ALWAYS, LOG_ERR, "ZLIB compression is unavailable on this node.");
 990                         return false;
 991 #endif
 992
 993                 case COMPRESS_NONE:
 994                         break;
 995
 996                 default:
 997                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 998                         logger(DEBUG_ALWAYS, LOG_ERR, "Compression level %i is unrecognized by this node.", myself->incompression);
 999                         return false;
1000                 }
1001         } else {
1002                 myself->incompression = COMPRESS_NONE;
1003         }
1004
1005         /* Done */
1006
1007         myself->nexthop = myself;
1008         myself->via = myself;
1009         myself->status.reachable = true;
1010         myself->last_state_change = now.tv_sec;
1011         myself->status.sptps = experimental;
1012         node_add(myself);
1013
1014         graph();
1015
1016         load_all_nodes();
1017
1018         /* Open device */
1019
1020         devops = os_devops;
1021
1022         if(get_config_string(lookup_config(&config_tree, "DeviceType"), &type)) {
1023                 if(!strcasecmp(type, "dummy")) {
1024                         devops = dummy_devops;
1025                 } else if(!strcasecmp(type, "raw_socket")) {
1026                         devops = raw_socket_devops;
1027                 } else if(!strcasecmp(type, "multicast")) {
1028                         devops = multicast_devops;
1029                 }
1030
1031 #ifdef HAVE_SYS_UN_H
1032                 else if(!strcasecmp(type, "fd")) {
1033                         devops = fd_devops;
1034                 }
1035
1036 #endif
1037 #ifdef ENABLE_UML
1038                 else if(!strcasecmp(type, "uml")) {
1039                         devops = uml_devops;
1040                 }
1041
1042 #endif
1043 #ifdef ENABLE_VDE
1044                 else if(!strcasecmp(type, "vde")) {
1045                         devops = vde_devops;
1046                 }
1047
1048 #endif
1049                 free(type);
1050         }
1051
1052         get_config_bool(lookup_config(&config_tree, "DeviceStandby"), &device_standby);
1053
1054         if(!devops.setup()) {
1055                 return false;
1056         }
1057
1058         if(device_fd >= 0) {
1059                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
1060         }
1061
1062         /* Open sockets */
1063
1064         if(!do_detach && getenv("LISTEN_FDS")) {
1065                 sockaddr_t sa;
1066                 socklen_t salen;
1067
1068                 listen_sockets = atoi(getenv("LISTEN_FDS"));
1069 #ifdef HAVE_UNSETENV
1070                 unsetenv("LISTEN_FDS");
1071 #endif
1072
1073                 if(listen_sockets > MAXSOCKETS) {
1074                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
1075                         return false;
1076                 }
1077
1078                 for(int i = 0; i < listen_sockets; i++) {
1079                         const int tcp_fd = i + 3;
1080                         salen = sizeof(sa);
1081
1082                         if(getsockname(tcp_fd, &sa.sa, &salen) < 0) {
1083                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", tcp_fd, sockstrerror(sockerrno));
1084                                 return false;
1085                         }
1086
1087 #ifdef FD_CLOEXEC
1088                         fcntl(tcp_fd, F_SETFD, FD_CLOEXEC);
1089 #endif
1090
1091                         int udp_fd = setup_vpn_in_socket(&sa);
1092
1093                         if(udp_fd < 0) {
1094                                 return false;
1095                         }
1096
1097                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], tcp_fd, IO_READ);
1098                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
1099
1100                         if(debug_level >= DEBUG_CONNECTIONS) {
1101                                 char *hostname = sockaddr2hostname(&sa);
1102                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
1103                                 free(hostname);
1104                         }
1105
1106                         memcpy(&listen_socket[i].sa, &sa, salen);
1107                 }
1108         } else {
1109                 listen_sockets = 0;
1110                 int cfgs = 0;
1111
1112                 for(config_t *cfg = lookup_config(&config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(&config_tree, cfg)) {
1113                         cfgs++;
1114                         get_config_string(cfg, &address);
1115
1116                         if(!add_listen_address(address, true)) {
1117                                 return false;
1118                         }
1119                 }
1120
1121                 for(config_t *cfg = lookup_config(&config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(&config_tree, cfg)) {
1122                         cfgs++;
1123                         get_config_string(cfg, &address);
1124
1125                         if(!add_listen_address(address, false)) {
1126                                 return false;
1127                         }
1128                 }
1129
1130                 if(!cfgs)
1131                         if(!add_listen_address(address, NULL)) {
1132                                 return false;
1133                         }
1134         }
1135
1136         if(!listen_sockets) {
1137                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1138                 return false;
1139         }
1140
1141         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1142
1143         if(!port_specified || atoi(myport.tcp) == 0) {
1144                 listen_socket_t *sock = &listen_socket[0];
1145
1146                 uint16_t tcp = get_bound_port(sock->tcp.fd);
1147                 free(myport.tcp);
1148                 myport.tcp = int_to_str(tcp);
1149
1150                 uint16_t udp = get_bound_port(sock->udp.fd);
1151                 free(myport.udp);
1152                 myport.udp = int_to_str(udp);
1153         }
1154
1155         xasprintf(&myself->hostname, "MYSELF port %s", myport.tcp);
1156         myself->connection->hostname = xstrdup(myself->hostname);
1157
1158         char *upnp = NULL;
1159         get_config_string(lookup_config(&config_tree, "UPnP"), &upnp);
1160         bool upnp_tcp = false;
1161         bool upnp_udp = false;
1162
1163         if(upnp) {
1164                 if(!strcasecmp(upnp, "yes")) {
1165                         upnp_tcp = upnp_udp = true;
1166                 } else if(!strcasecmp(upnp, "udponly")) {
1167                         upnp_udp = true;
1168                 }
1169
1170                 free(upnp);
1171         }
1172
1173         if(upnp_tcp || upnp_udp) {
1174 #ifdef HAVE_MINIUPNPC
1175                 upnp_init(upnp_tcp, upnp_udp);
1176 #else
1177                 logger(DEBUG_ALWAYS, LOG_WARNING, "UPnP was requested, but tinc isn't built with miniupnpc support!");
1178 #endif
1179         }
1180
1181         /* Done. */
1182
1183         last_config_check = now.tv_sec;
1184
1185         return true;
1186 }
1187
1188 /*
1189   initialize network
1190 */
1191 bool setup_network(void) {
1192         init_connections();
1193         init_subnets();
1194
1195         if(get_config_int(lookup_config(&config_tree, "PingInterval"), &pinginterval)) {
1196                 if(pinginterval < 1) {
1197                         pinginterval = 86400;
1198                 }
1199         } else {
1200                 pinginterval = 60;
1201         }
1202
1203         if(!get_config_int(lookup_config(&config_tree, "PingTimeout"), &pingtimeout)) {
1204                 pingtimeout = 5;
1205         }
1206
1207         if(pingtimeout < 1 || pingtimeout > pinginterval) {
1208                 pingtimeout = pinginterval;
1209         }
1210
1211         if(!get_config_int(lookup_config(&config_tree, "MaxOutputBufferSize"), &maxoutbufsize)) {
1212                 maxoutbufsize = 10 * MTU;
1213         }
1214
1215         if(!setup_myself()) {
1216                 return false;
1217         }
1218
1219         if(!init_control()) {
1220                 return false;
1221         }
1222
1223         if(!device_standby) {
1224                 device_enable();
1225         }
1226
1227         /* Run subnet-up scripts for our own subnets */
1228
1229         subnet_update(myself, NULL, true);
1230
1231         return true;
1232 }
1233
1234 /*
1235   close all open network connections
1236 */
1237 void close_network_connections(void) {
1238         for(list_node_t *node = connection_list.head, *next; node; node = next) {
1239                 next = node->next;
1240                 connection_t *c = node->data;
1241
1242                 /* Keep control connections open until the end, so they know when we really terminated */
1243                 if(c->status.control) {
1244                         c->socket = -1;
1245                 }
1246
1247                 c->outgoing = NULL;
1248                 terminate_connection(c, false);
1249         }
1250
1251         list_empty_list(&outgoing_list);
1252
1253         if(myself && myself->connection) {
1254                 subnet_update(myself, NULL, false);
1255                 free_connection(myself->connection);
1256         }
1257
1258         for(int i = 0; i < listen_sockets; i++) {
1259                 io_del(&listen_socket[i].tcp);
1260                 io_del(&listen_socket[i].udp);
1261                 closesocket(listen_socket[i].tcp.fd);
1262                 closesocket(listen_socket[i].udp.fd);
1263         }
1264
1265         exit_requests();
1266         exit_edges();
1267         exit_subnets();
1268         exit_nodes();
1269         exit_connections();
1270
1271         if(!device_standby) {
1272                 device_disable();
1273         }
1274
1275         free(myport.tcp);
1276         free(myport.udp);
1277
1278         if(device_fd >= 0) {
1279                 io_del(&device_io);
1280         }
1281
1282         if(devops.close) {
1283                 devops.close();
1284         }
1285
1286         exit_control();
1287
1288         free(scriptextension);
1289         free(scriptinterpreter);
1290
1291         return;
1292 }