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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2010 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 "splay_tree.h"
  26 #include "cipher.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 "net.h"
  36 #include "netutl.h"
  37 #include "process.h"
  38 #include "protocol.h"
  39 #include "route.h"
  40 #include "rsa.h"
  41 #include "subnet.h"
  42 #include "utils.h"
  43 #include "xalloc.h"
  44
  45 char *myport;
  46 static struct event device_ev;
  47
  48 bool read_ecdsa_public_key(connection_t *c) {
  49         FILE *fp;
  50         char *fname;
  51         char *p;
  52         bool result;
  53
  54         /* First, check for simple ECDSAPublicKey statement */
  55
  56         if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
  57                 result = ecdsa_set_base64_public_key(&c->ecdsa, p);
  58                 free(p);
  59                 return result;
  60         }
  61
  62         /* Else, check for ECDSAPublicKeyFile statement and read it */
  63
  64         if(!get_config_string(lookup_config(c->config_tree, "ECDSAPublicKeyFile"), &fname))
  65                 xasprintf(&fname, "%s/hosts/%s", confbase, c->name);
  66
  67         fp = fopen(fname, "r");
  68
  69         if(!fp) {
  70                 logger(LOG_ERR, "Error reading ECDSA public key file `%s': %s",
  71                            fname, strerror(errno));
  72                 free(fname);
  73                 return false;
  74         }
  75
  76         result = ecdsa_read_pem_public_key(&c->ecdsa, fp);
  77         fclose(fp);
  78
  79         if(!result)
  80                 logger(LOG_ERR, "Reading ECDSA public key file `%s' failed: %s", fname, strerror(errno));
  81         free(fname);
  82         return result;
  83 }
  84
  85 bool read_rsa_public_key(connection_t *c) {
  86         FILE *fp;
  87         char *fname;
  88         char *n;
  89         bool result;
  90
  91         /* First, check for simple PublicKey statement */
  92
  93         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
  94                 result = rsa_set_hex_public_key(&c->rsa, n, "FFFF");
  95                 free(n);
  96                 return result;
  97         }
  98
  99         /* Else, check for PublicKeyFile statement and read it */
 100
 101         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 102                 xasprintf(&fname, "%s/hosts/%s", confbase, c->name);
 103
 104         fp = fopen(fname, "r");
 105
 106         if(!fp) {
 107                 logger(LOG_ERR, "Error reading RSA public key file `%s': %s",
 108                            fname, strerror(errno));
 109                 free(fname);
 110                 return false;
 111         }
 112
 113         result = rsa_read_pem_public_key(&c->rsa, fp);
 114         fclose(fp);
 115
 116         if(!result)
 117                 logger(LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 118         free(fname);
 119         return result;
 120 }
 121
 122 static bool read_ecdsa_private_key(void) {
 123         FILE *fp;
 124         char *fname;
 125         bool result;
 126
 127         /* Check for PrivateKeyFile statement and read it */
 128
 129         if(!get_config_string(lookup_config(config_tree, "ECDSAPrivateKeyFile"), &fname))
 130                 xasprintf(&fname, "%s/ecdsa_key.priv", confbase);
 131
 132         fp = fopen(fname, "r");
 133
 134         if(!fp) {
 135                 logger(LOG_ERR, "Error reading ECDSA private key file `%s': %s",
 136                            fname, strerror(errno));
 137                 free(fname);
 138                 return false;
 139         }
 140
 141 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 142         struct stat s;
 143
 144         if(fstat(fileno(fp), &s)) {
 145                 logger(LOG_ERR, "Could not stat ECDSA private key file `%s': %s'", fname, strerror(errno));
 146                 free(fname);
 147                 return false;
 148         }
 149
 150         if(s.st_mode & ~0100700)
 151                 logger(LOG_WARNING, "Warning: insecure file permissions for ECDSA private key file `%s'!", fname);
 152 #endif
 153
 154         result = ecdsa_read_pem_private_key(&myself->connection->ecdsa, fp);
 155         fclose(fp);
 156
 157         if(!result)
 158                 logger(LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 159         free(fname);
 160         return result;
 161 }
 162
 163 static bool read_rsa_private_key(void) {
 164         FILE *fp;
 165         char *fname;
 166         char *n, *d;
 167         bool result;
 168
 169         /* First, check for simple PrivateKey statement */
 170
 171         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 172                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 173                         logger(LOG_ERR, "PrivateKey used but no PublicKey found!");
 174                         free(d);
 175                         return false;
 176                 }
 177                 result = rsa_set_hex_private_key(&myself->connection->rsa, n, "FFFF", d);
 178                 free(n);
 179                 free(d);
 180                 return true;
 181         }
 182
 183         /* Else, check for PrivateKeyFile statement and read it */
 184
 185         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 186                 xasprintf(&fname, "%s/rsa_key.priv", confbase);
 187
 188         fp = fopen(fname, "r");
 189
 190         if(!fp) {
 191                 logger(LOG_ERR, "Error reading RSA private key file `%s': %s",
 192                            fname, strerror(errno));
 193                 free(fname);
 194                 return false;
 195         }
 196
 197 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 198         struct stat s;
 199
 200         if(fstat(fileno(fp), &s)) {
 201                 logger(LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 202                 free(fname);
 203                 return false;
 204         }
 205
 206         if(s.st_mode & ~0100700)
 207                 logger(LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 208 #endif
 209
 210         result = rsa_read_pem_private_key(&myself->connection->rsa, fp);
 211         fclose(fp);
 212
 213         if(!result)
 214                 logger(LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 215         free(fname);
 216         return result;
 217 }
 218
 219 static struct event keyexpire_event;
 220
 221 static void keyexpire_handler(int fd, short events, void *data) {
 222         regenerate_key();
 223 }
 224
 225 void regenerate_key(void) {
 226         if(timeout_initialized(&keyexpire_event)) {
 227                 ifdebug(STATUS) logger(LOG_INFO, "Expiring symmetric keys");
 228                 event_del(&keyexpire_event);
 229                 send_key_changed();
 230         } else {
 231                 timeout_set(&keyexpire_event, keyexpire_handler, NULL);
 232         }
 233
 234         event_add(&keyexpire_event, &(struct timeval){keylifetime, 0});
 235 }
 236
 237 /*
 238   Read Subnets from all host config files
 239 */
 240 void load_all_subnets(void) {
 241         DIR *dir;
 242         struct dirent *ent;
 243         char *dname;
 244         char *fname;
 245         splay_tree_t *config_tree;
 246         config_t *cfg;
 247         subnet_t *s, *s2;
 248         node_t *n;
 249         bool result;
 250
 251         xasprintf(&dname, "%s/hosts", confbase);
 252         dir = opendir(dname);
 253         if(!dir) {
 254                 logger(LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 255                 free(dname);
 256                 return;
 257         }
 258
 259         while((ent = readdir(dir))) {
 260                 if(!check_id(ent->d_name))
 261                         continue;
 262
 263                 n = lookup_node(ent->d_name);
 264                 #ifdef _DIRENT_HAVE_D_TYPE
 265                 //if(ent->d_type != DT_REG)
 266                 //      continue;
 267                 #endif
 268
 269                 xasprintf(&fname, "%s/hosts/%s", confbase, ent->d_name);
 270                 init_configuration(&config_tree);
 271                 result = read_config_file(config_tree, fname);
 272                 free(fname);
 273                 if(!result)
 274                         continue;
 275
 276                 if(!n) {
 277                         n = new_node();
 278                         n->name = xstrdup(ent->d_name);
 279                         node_add(n);
 280                 }
 281
 282                 for(cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 283                         if(!get_config_subnet(cfg, &s))
 284                                 continue;
 285
 286                         if((s2 = lookup_subnet(n, s))) {
 287                                 s2->expires = -1;
 288                         } else {
 289                                 subnet_add(n, s);
 290                         }
 291                 }
 292
 293                 exit_configuration(&config_tree);
 294         }
 295
 296         closedir(dir);
 297 }
 298
 299 /*
 300   Configure node_t myself and set up the local sockets (listen only)
 301 */
 302 static bool setup_myself(void) {
 303         config_t *cfg;
 304         subnet_t *subnet;
 305         char *name, *hostname, *mode, *afname, *cipher, *digest;
 306         char *fname = NULL;
 307         char *address = NULL;
 308         char *envp[5];
 309         struct addrinfo *ai, *aip, hint = {0};
 310         bool choice;
 311         int i, err;
 312         int replaywin_int;
 313
 314         myself = new_node();
 315         myself->connection = new_connection();
 316
 317         myself->hostname = xstrdup("MYSELF");
 318         myself->connection->hostname = xstrdup("MYSELF");
 319
 320         myself->connection->options = 0;
 321         myself->connection->protocol_major = PROT_MAJOR;
 322         myself->connection->protocol_minor = PROT_MINOR;
 323
 324         if(!get_config_string(lookup_config(config_tree, "Name"), &name)) {     /* Not acceptable */
 325                 logger(LOG_ERR, "Name for tinc daemon required!");
 326                 return false;
 327         }
 328
 329         if(!check_id(name)) {
 330                 logger(LOG_ERR, "Invalid name for myself!");
 331                 free(name);
 332                 return false;
 333         }
 334
 335         myself->name = name;
 336         myself->connection->name = xstrdup(name);
 337         xasprintf(&fname, "%s/hosts/%s", confbase, name);
 338         read_config_options(config_tree, name);
 339         read_config_file(config_tree, fname);
 340         free(fname);
 341
 342         get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental);
 343
 344         if(experimental && !read_ecdsa_private_key())
 345                 return false;
 346
 347         if(!read_rsa_private_key())
 348                 return false;
 349
 350         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 351                 myport = xstrdup("655");
 352
 353         if(!atoi(myport)) {
 354                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 355                 sockaddr_t sa;
 356                 if(!ai || !ai->ai_addr)
 357                         return false;
 358                 free(myport);
 359                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 360                 sockaddr2str(&sa, NULL, &myport);
 361         }
 362
 363         /* Read in all the subnets specified in the host configuration file */
 364
 365         cfg = lookup_config(config_tree, "Subnet");
 366
 367         while(cfg) {
 368                 if(!get_config_subnet(cfg, &subnet))
 369                         return false;
 370
 371                 subnet_add(myself, subnet);
 372
 373                 cfg = lookup_config_next(config_tree, cfg);
 374         }
 375
 376         /* Check some options */
 377
 378         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 379                 myself->options |= OPTION_INDIRECT;
 380
 381         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 382                 myself->options |= OPTION_TCPONLY;
 383
 384         if(myself->options & OPTION_TCPONLY)
 385                 myself->options |= OPTION_INDIRECT;
 386
 387         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 388         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 389         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 390         strictsubnets |= tunnelserver;
 391
 392         if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
 393                 if(!strcasecmp(mode, "router"))
 394                         routing_mode = RMODE_ROUTER;
 395                 else if(!strcasecmp(mode, "switch"))
 396                         routing_mode = RMODE_SWITCH;
 397                 else if(!strcasecmp(mode, "hub"))
 398                         routing_mode = RMODE_HUB;
 399                 else {
 400                         logger(LOG_ERR, "Invalid routing mode!");
 401                         return false;
 402                 }
 403                 free(mode);
 404         }
 405
 406         if(get_config_string(lookup_config(config_tree, "Forwarding"), &mode)) {
 407                 if(!strcasecmp(mode, "off"))
 408                         forwarding_mode = FMODE_OFF;
 409                 else if(!strcasecmp(mode, "internal"))
 410                         forwarding_mode = FMODE_INTERNAL;
 411                 else if(!strcasecmp(mode, "kernel"))
 412                         forwarding_mode = FMODE_KERNEL;
 413                 else {
 414                         logger(LOG_ERR, "Invalid forwarding mode!");
 415                         return false;
 416                 }
 417                 free(mode);
 418         }
 419
 420         choice = true;
 421         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 422         if(choice)
 423                 myself->options |= OPTION_PMTU_DISCOVERY;
 424
 425         choice = true;
 426         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 427         if(choice)
 428                 myself->options |= OPTION_CLAMP_MSS;
 429
 430         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 431
 432 #if !defined(SOL_IP) || !defined(IP_TOS)
 433         if(priorityinheritance)
 434                 logger(LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 435 #endif
 436
 437         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 438                 macexpire = 600;
 439
 440         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 441                 if(maxtimeout <= 0) {
 442                         logger(LOG_ERR, "Bogus maximum timeout!");
 443                         return false;
 444                 }
 445         } else
 446                 maxtimeout = 900;
 447
 448         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 449                 if(udp_rcvbuf <= 0) {
 450                         logger(LOG_ERR, "UDPRcvBuf cannot be negative!");
 451                         return false;
 452                 }
 453         }
 454
 455         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 456                 if(udp_sndbuf <= 0) {
 457                         logger(LOG_ERR, "UDPSndBuf cannot be negative!");
 458                         return false;
 459                 }
 460         }
 461
 462         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 463                 if(replaywin_int < 0) {
 464                         logger(LOG_ERR, "ReplayWindow cannot be negative!");
 465                         return false;
 466                 }
 467                 replaywin = (unsigned)replaywin_int;
 468         }
 469
 470         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 471                 if(!strcasecmp(afname, "IPv4"))
 472                         addressfamily = AF_INET;
 473                 else if(!strcasecmp(afname, "IPv6"))
 474                         addressfamily = AF_INET6;
 475                 else if(!strcasecmp(afname, "any"))
 476                         addressfamily = AF_UNSPEC;
 477                 else {
 478                         logger(LOG_ERR, "Invalid address family!");
 479                         return false;
 480                 }
 481                 free(afname);
 482         }
 483
 484         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 485
 486         /* Generate packet encryption key */
 487
 488         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 489                 cipher = xstrdup("blowfish");
 490
 491         if(!cipher_open_by_name(&myself->incipher, cipher)) {
 492                 logger(LOG_ERR, "Unrecognized cipher type!");
 493                 return false;
 494         }
 495
 496         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 497                 keylifetime = 3600;
 498
 499         regenerate_key();
 500
 501         /* Check if we want to use message authentication codes... */
 502
 503         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 504                 digest = xstrdup("sha1");
 505
 506         int maclength = 4;
 507         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 508
 509         if(maclength < 0) {
 510                 logger(LOG_ERR, "Bogus MAC length!");
 511                 return false;
 512         }
 513
 514         if(!digest_open_by_name(&myself->indigest, digest, maclength)) {
 515                 logger(LOG_ERR, "Unrecognized digest type!");
 516                 return false;
 517         }
 518
 519         /* Compression */
 520
 521         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 522                 if(myself->incompression < 0 || myself->incompression > 11) {
 523                         logger(LOG_ERR, "Bogus compression level!");
 524                         return false;
 525                 }
 526         } else
 527                 myself->incompression = 0;
 528
 529         myself->connection->outcompression = 0;
 530
 531         /* Done */
 532
 533         myself->nexthop = myself;
 534         myself->via = myself;
 535         myself->status.reachable = true;
 536         node_add(myself);
 537
 538         graph();
 539
 540         if(strictsubnets)
 541                 load_all_subnets();
 542
 543         /* Open device */
 544
 545         if(!setup_device())
 546                 return false;
 547
 548         if(device_fd >= 0) {
 549                 event_set(&device_ev, device_fd, EV_READ|EV_PERSIST, handle_device_data, NULL);
 550
 551                 if (event_add(&device_ev, NULL) < 0) {
 552                         logger(LOG_ERR, "event_add failed: %s", strerror(errno));
 553                         close_device();
 554                         return false;
 555                 }
 556         }
 557
 558         /* Run tinc-up script to further initialize the tap interface */
 559         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 560         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 561         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 562         xasprintf(&envp[3], "NAME=%s", myself->name);
 563         envp[4] = NULL;
 564
 565         execute_script("tinc-up", envp);
 566
 567         for(i = 0; i < 4; i++)
 568                 free(envp[i]);
 569
 570         /* Run subnet-up scripts for our own subnets */
 571
 572         subnet_update(myself, NULL, true);
 573
 574         /* Open sockets */
 575
 576         get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
 577
 578         hint.ai_family = addressfamily;
 579         hint.ai_socktype = SOCK_STREAM;
 580         hint.ai_protocol = IPPROTO_TCP;
 581         hint.ai_flags = AI_PASSIVE;
 582
 583         err = getaddrinfo(address, myport, &hint, &ai);
 584
 585         if(err || !ai) {
 586                 logger(LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
 587                            gai_strerror(err));
 588                 return false;
 589         }
 590
 591         listen_sockets = 0;
 592
 593         for(aip = ai; aip; aip = aip->ai_next) {
 594                 listen_socket[listen_sockets].tcp =
 595                         setup_listen_socket((sockaddr_t *) aip->ai_addr);
 596
 597                 if(listen_socket[listen_sockets].tcp < 0)
 598                         continue;
 599
 600                 listen_socket[listen_sockets].udp =
 601                         setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 602
 603                 if(listen_socket[listen_sockets].udp < 0) {
 604                         close(listen_socket[listen_sockets].tcp);
 605                         continue;
 606                 }
 607
 608                 event_set(&listen_socket[listen_sockets].ev_tcp,
 609                                   listen_socket[listen_sockets].tcp,
 610                                   EV_READ|EV_PERSIST,
 611                                   handle_new_meta_connection, NULL);
 612                 if(event_add(&listen_socket[listen_sockets].ev_tcp, NULL) < 0) {
 613                         logger(LOG_ERR, "event_add failed: %s", strerror(errno));
 614                         abort();
 615                 }
 616
 617                 event_set(&listen_socket[listen_sockets].ev_udp,
 618                                   listen_socket[listen_sockets].udp,
 619                                   EV_READ|EV_PERSIST,
 620                                   handle_incoming_vpn_data, NULL);
 621                 if(event_add(&listen_socket[listen_sockets].ev_udp, NULL) < 0) {
 622                         logger(LOG_ERR, "event_add failed: %s", strerror(errno));
 623                         abort();
 624                 }
 625
 626                 ifdebug(CONNECTIONS) {
 627                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 628                         logger(LOG_NOTICE, "Listening on %s", hostname);
 629                         free(hostname);
 630                 }
 631
 632                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 633                 listen_sockets++;
 634
 635                 if(listen_sockets >= MAXSOCKETS) {
 636                         logger(LOG_WARNING, "Maximum of %d listening sockets reached", MAXSOCKETS);
 637                         break;
 638                 }
 639         }
 640
 641         freeaddrinfo(ai);
 642
 643         if(listen_sockets)
 644                 logger(LOG_NOTICE, "Ready");
 645         else {
 646                 logger(LOG_ERR, "Unable to create any listening socket!");
 647                 return false;
 648         }
 649
 650         return true;
 651 }
 652
 653 /*
 654   initialize network
 655 */
 656 bool setup_network(void) {
 657         init_connections();
 658         init_subnets();
 659         init_nodes();
 660         init_edges();
 661         init_requests();
 662
 663         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 664                 if(pinginterval < 1) {
 665                         pinginterval = 86400;
 666                 }
 667         } else
 668                 pinginterval = 60;
 669
 670         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 671                 pingtimeout = 5;
 672         if(pingtimeout < 1 || pingtimeout > pinginterval)
 673                 pingtimeout = pinginterval;
 674
 675         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 676                 maxoutbufsize = 10 * MTU;
 677
 678         if(!setup_myself())
 679                 return false;
 680
 681         return true;
 682 }
 683
 684 /*
 685   close all open network connections
 686 */
 687 void close_network_connections(void) {
 688         splay_node_t *node, *next;
 689         connection_t *c;
 690         char *envp[5];
 691         int i;
 692
 693         for(node = connection_tree->head; node; node = next) {
 694                 next = node->next;
 695                 c = node->data;
 696                 c->outgoing = NULL;
 697                 terminate_connection(c, false);
 698         }
 699
 700         list_delete_list(outgoing_list);
 701
 702         if(myself && myself->connection) {
 703                 subnet_update(myself, NULL, false);
 704                 terminate_connection(myself->connection, false);
 705                 free_connection(myself->connection);
 706         }
 707
 708         for(i = 0; i < listen_sockets; i++) {
 709                 event_del(&listen_socket[i].ev_tcp);
 710                 event_del(&listen_socket[i].ev_udp);
 711                 close(listen_socket[i].tcp);
 712                 close(listen_socket[i].udp);
 713         }
 714
 715         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 716         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 717         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 718         xasprintf(&envp[3], "NAME=%s", myself->name);
 719         envp[4] = NULL;
 720
 721         exit_requests();
 722         exit_edges();
 723         exit_subnets();
 724         exit_nodes();
 725         exit_connections();
 726
 727         execute_script("tinc-down", envp);
 728
 729         if(myport) free(myport);
 730
 731         for(i = 0; i < 4; i++)
 732                 free(envp[i]);
 733
 734         close_device();
 735
 736         return;
 737 }