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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2012 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 <openssl/pem.h>
  26 #include <openssl/rsa.h>
  27 #include <openssl/rand.h>
  28 #include <openssl/err.h>
  29 #include <openssl/evp.h>
  30
  31 #include "avl_tree.h"
  32 #include "conf.h"
  33 #include "connection.h"
  34 #include "device.h"
  35 #include "event.h"
  36 #include "graph.h"
  37 #include "logger.h"
  38 #include "net.h"
  39 #include "netutl.h"
  40 #include "process.h"
  41 #include "protocol.h"
  42 #include "route.h"
  43 #include "subnet.h"
  44 #include "utils.h"
  45 #include "xalloc.h"
  46
  47 char *myport;
  48 devops_t devops;
  49
  50 bool read_rsa_public_key(connection_t *c) {
  51         FILE *fp;
  52         char *fname;
  53         char *key;
  54
  55         if(!c->rsa_key) {
  56                 c->rsa_key = RSA_new();
  57 //              RSA_blinding_on(c->rsa_key, NULL);
  58         }
  59
  60         /* First, check for simple PublicKey statement */
  61
  62         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) {
  63                 BN_hex2bn(&c->rsa_key->n, key);
  64                 BN_hex2bn(&c->rsa_key->e, "FFFF");
  65                 free(key);
  66                 return true;
  67         }
  68
  69         /* Else, check for PublicKeyFile statement and read it */
  70
  71         if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) {
  72                 fp = fopen(fname, "r");
  73
  74                 if(!fp) {
  75                         logger(LOG_ERR, "Error reading RSA public key file `%s': %s",
  76                                    fname, strerror(errno));
  77                         free(fname);
  78                         return false;
  79                 }
  80
  81                 free(fname);
  82                 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
  83                 fclose(fp);
  84
  85                 if(c->rsa_key)
  86                         return true;            /* Woohoo. */
  87
  88                 /* If it fails, try PEM_read_RSA_PUBKEY. */
  89                 fp = fopen(fname, "r");
  90
  91                 if(!fp) {
  92                         logger(LOG_ERR, "Error reading RSA public key file `%s': %s",
  93                                    fname, strerror(errno));
  94                         free(fname);
  95                         return false;
  96                 }
  97
  98                 free(fname);
  99                 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
 100                 fclose(fp);
 101
 102                 if(c->rsa_key) {
 103 //                              RSA_blinding_on(c->rsa_key, NULL);
 104                         return true;
 105                 }
 106
 107                 logger(LOG_ERR, "Reading RSA public key file `%s' failed: %s",
 108                            fname, strerror(errno));
 109                 return false;
 110         }
 111
 112         /* Else, check if a harnessed public key is in the config file */
 113
 114         xasprintf(&fname, "%s/hosts/%s", confbase, c->name);
 115         fp = fopen(fname, "r");
 116
 117         if(!fp) {
 118                 logger(LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 119                 free(fname);
 120                 return false;
 121         }
 122
 123         c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
 124         fclose(fp);
 125         free(fname);
 126
 127         if(c->rsa_key)
 128                 return true;
 129
 130         /* Try again with PEM_read_RSA_PUBKEY. */
 131
 132         xasprintf(&fname, "%s/hosts/%s", confbase, c->name);
 133         fp = fopen(fname, "r");
 134
 135         if(!fp) {
 136                 logger(LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 137                 free(fname);
 138                 return false;
 139         }
 140
 141         c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
 142 //      RSA_blinding_on(c->rsa_key, NULL);
 143         fclose(fp);
 144         free(fname);
 145
 146         if(c->rsa_key)
 147                 return true;
 148
 149         logger(LOG_ERR, "No public key for %s specified!", c->name);
 150
 151         return false;
 152 }
 153
 154 static bool read_rsa_private_key(void) {
 155         FILE *fp;
 156         char *fname, *key, *pubkey;
 157         struct stat s;
 158
 159         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
 160                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &pubkey)) {
 161                         logger(LOG_ERR, "PrivateKey used but no PublicKey found!");
 162                         return false;
 163                 }
 164                 myself->connection->rsa_key = RSA_new();
 165 //              RSA_blinding_on(myself->connection->rsa_key, NULL);
 166                 BN_hex2bn(&myself->connection->rsa_key->d, key);
 167                 BN_hex2bn(&myself->connection->rsa_key->n, pubkey);
 168                 BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
 169                 free(key);
 170                 free(pubkey);
 171                 return true;
 172         }
 173
 174         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 175                 xasprintf(&fname, "%s/rsa_key.priv", confbase);
 176
 177         fp = fopen(fname, "r");
 178
 179         if(!fp) {
 180                 logger(LOG_ERR, "Error reading RSA private key file `%s': %s",
 181                            fname, strerror(errno));
 182                 free(fname);
 183                 return false;
 184         }
 185
 186 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 187         if(fstat(fileno(fp), &s)) {
 188                 logger(LOG_ERR, "Could not stat RSA private key file `%s': %s'",
 189                                 fname, strerror(errno));
 190                 free(fname);
 191                 return false;
 192         }
 193
 194         if(s.st_mode & ~0100700)
 195                 logger(LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 196 #endif
 197
 198         myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
 199         fclose(fp);
 200
 201         if(!myself->connection->rsa_key) {
 202                 logger(LOG_ERR, "Reading RSA private key file `%s' failed: %s",
 203                            fname, strerror(errno));
 204                 free(fname);
 205                 return false;
 206         }
 207
 208         free(fname);
 209         return true;
 210 }
 211
 212 /*
 213   Read Subnets from all host config files
 214 */
 215 void load_all_subnets(void) {
 216         DIR *dir;
 217         struct dirent *ent;
 218         char *dname;
 219         char *fname;
 220         avl_tree_t *config_tree;
 221         config_t *cfg;
 222         subnet_t *s, *s2;
 223         node_t *n;
 224         bool result;
 225
 226         xasprintf(&dname, "%s/hosts", confbase);
 227         dir = opendir(dname);
 228         if(!dir) {
 229                 logger(LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 230                 free(dname);
 231                 return;
 232         }
 233
 234         while((ent = readdir(dir))) {
 235                 if(!check_id(ent->d_name))
 236                         continue;
 237
 238                 n = lookup_node(ent->d_name);
 239                 #ifdef _DIRENT_HAVE_D_TYPE
 240                 //if(ent->d_type != DT_REG)
 241                 //      continue;
 242                 #endif
 243
 244                 xasprintf(&fname, "%s/hosts/%s", confbase, ent->d_name);
 245                 init_configuration(&config_tree);
 246                 result = read_config_file(config_tree, fname);
 247                 free(fname);
 248                 if(!result)
 249                         continue;
 250
 251                 if(!n) {
 252                         n = new_node();
 253                         n->name = xstrdup(ent->d_name);
 254                         node_add(n);
 255                 }
 256
 257                 for(cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 258                         if(!get_config_subnet(cfg, &s))
 259                                 continue;
 260
 261                         if((s2 = lookup_subnet(n, s))) {
 262                                 s2->expires = -1;
 263                         } else {
 264                                 subnet_add(n, s);
 265                         }
 266                 }
 267
 268                 exit_configuration(&config_tree);
 269         }
 270
 271         closedir(dir);
 272 }
 273
 274 /*
 275   Configure node_t myself and set up the local sockets (listen only)
 276 */
 277 static bool setup_myself(void) {
 278         config_t *cfg;
 279         subnet_t *subnet;
 280         char *name, *hostname, *mode, *afname, *cipher, *digest, *type;
 281         char *fname = NULL;
 282         char *address = NULL;
 283         char *envp[5];
 284         struct addrinfo *ai, *aip, hint = {0};
 285         bool choice;
 286         int i, err;
 287         int replaywin_int;
 288
 289         myself = new_node();
 290         myself->connection = new_connection();
 291
 292         myself->hostname = xstrdup("MYSELF");
 293         myself->connection->hostname = xstrdup("MYSELF");
 294
 295         myself->connection->options = 0;
 296         myself->connection->protocol_version = PROT_CURRENT;
 297
 298         if(!get_config_string(lookup_config(config_tree, "Name"), &name)) {     /* Not acceptable */
 299                 logger(LOG_ERR, "Name for tinc daemon required!");
 300                 return false;
 301         }
 302
 303         if(!check_id(name)) {
 304                 logger(LOG_ERR, "Invalid name for myself!");
 305                 free(name);
 306                 return false;
 307         }
 308
 309         myself->name = name;
 310         myself->connection->name = xstrdup(name);
 311         xasprintf(&fname, "%s/hosts/%s", confbase, name);
 312         read_config_options(config_tree, name);
 313         read_config_file(config_tree, fname);
 314         free(fname);
 315
 316         if(!read_rsa_private_key())
 317                 return false;
 318
 319         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 320                 myport = xstrdup("655");
 321
 322         if(!atoi(myport)) {
 323                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 324                 sockaddr_t sa;
 325                 if(!ai || !ai->ai_addr)
 326                         return false;
 327                 free(myport);
 328                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 329                 sockaddr2str(&sa, NULL, &myport);
 330         }
 331
 332         /* Read in all the subnets specified in the host configuration file */
 333
 334         cfg = lookup_config(config_tree, "Subnet");
 335
 336         while(cfg) {
 337                 if(!get_config_subnet(cfg, &subnet))
 338                         return false;
 339
 340                 subnet_add(myself, subnet);
 341
 342                 cfg = lookup_config_next(config_tree, cfg);
 343         }
 344
 345         /* Check some options */
 346
 347         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 348                 myself->options |= OPTION_INDIRECT;
 349
 350         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 351                 myself->options |= OPTION_TCPONLY;
 352
 353         if(myself->options & OPTION_TCPONLY)
 354                 myself->options |= OPTION_INDIRECT;
 355
 356         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 357         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 358         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 359         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 360         strictsubnets |= tunnelserver;
 361
 362         if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
 363                 if(!strcasecmp(mode, "router"))
 364                         routing_mode = RMODE_ROUTER;
 365                 else if(!strcasecmp(mode, "switch"))
 366                         routing_mode = RMODE_SWITCH;
 367                 else if(!strcasecmp(mode, "hub"))
 368                         routing_mode = RMODE_HUB;
 369                 else {
 370                         logger(LOG_ERR, "Invalid routing mode!");
 371                         return false;
 372                 }
 373                 free(mode);
 374         }
 375
 376         if(get_config_string(lookup_config(config_tree, "Forwarding"), &mode)) {
 377                 if(!strcasecmp(mode, "off"))
 378                         forwarding_mode = FMODE_OFF;
 379                 else if(!strcasecmp(mode, "internal"))
 380                         forwarding_mode = FMODE_INTERNAL;
 381                 else if(!strcasecmp(mode, "kernel"))
 382                         forwarding_mode = FMODE_KERNEL;
 383                 else {
 384                         logger(LOG_ERR, "Invalid forwarding mode!");
 385                         return false;
 386                 }
 387                 free(mode);
 388         }
 389
 390         choice = true;
 391         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 392         if(choice)
 393                 myself->options |= OPTION_PMTU_DISCOVERY;
 394
 395         choice = true;
 396         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 397         if(choice)
 398                 myself->options |= OPTION_CLAMP_MSS;
 399
 400         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 401         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 402         get_config_bool(lookup_config(config_tree, "Broadcast"), &broadcast);
 403
 404 #if !defined(SOL_IP) || !defined(IP_TOS)
 405         if(priorityinheritance)
 406                 logger(LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 407 #endif
 408
 409         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 410                 macexpire = 600;
 411
 412         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 413                 if(maxtimeout <= 0) {
 414                         logger(LOG_ERR, "Bogus maximum timeout!");
 415                         return false;
 416                 }
 417         } else
 418                 maxtimeout = 900;
 419
 420         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 421                 if(udp_rcvbuf <= 0) {
 422                         logger(LOG_ERR, "UDPRcvBuf cannot be negative!");
 423                         return false;
 424                 }
 425         }
 426
 427         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 428                 if(udp_sndbuf <= 0) {
 429                         logger(LOG_ERR, "UDPSndBuf cannot be negative!");
 430                         return false;
 431                 }
 432         }
 433
 434         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 435                 if(replaywin_int < 0) {
 436                         logger(LOG_ERR, "ReplayWindow cannot be negative!");
 437                         return false;
 438                 }
 439                 replaywin = (unsigned)replaywin_int;
 440         }
 441
 442         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 443                 if(!strcasecmp(afname, "IPv4"))
 444                         addressfamily = AF_INET;
 445                 else if(!strcasecmp(afname, "IPv6"))
 446                         addressfamily = AF_INET6;
 447                 else if(!strcasecmp(afname, "any"))
 448                         addressfamily = AF_UNSPEC;
 449                 else {
 450                         logger(LOG_ERR, "Invalid address family!");
 451                         return false;
 452                 }
 453                 free(afname);
 454         }
 455
 456         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 457
 458         /* Generate packet encryption key */
 459
 460         if(get_config_string
 461            (lookup_config(config_tree, "Cipher"), &cipher)) {
 462                 if(!strcasecmp(cipher, "none")) {
 463                         myself->incipher = NULL;
 464                 } else {
 465                         myself->incipher = EVP_get_cipherbyname(cipher);
 466
 467                         if(!myself->incipher) {
 468                                 logger(LOG_ERR, "Unrecognized cipher type!");
 469                                 return false;
 470                         }
 471                 }
 472         } else
 473                 myself->incipher = EVP_bf_cbc();
 474
 475         if(myself->incipher)
 476                 myself->inkeylength = myself->incipher->key_len + myself->incipher->iv_len;
 477         else
 478                 myself->inkeylength = 1;
 479
 480         myself->connection->outcipher = EVP_bf_ofb();
 481
 482         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 483                 keylifetime = 3600;
 484
 485         keyexpires = now + keylifetime;
 486
 487         /* Check if we want to use message authentication codes... */
 488
 489         if(get_config_string(lookup_config(config_tree, "Digest"), &digest)) {
 490                 if(!strcasecmp(digest, "none")) {
 491                         myself->indigest = NULL;
 492                 } else {
 493                         myself->indigest = EVP_get_digestbyname(digest);
 494
 495                         if(!myself->indigest) {
 496                                 logger(LOG_ERR, "Unrecognized digest type!");
 497                                 return false;
 498                         }
 499                 }
 500         } else
 501                 myself->indigest = EVP_sha1();
 502
 503         myself->connection->outdigest = EVP_sha1();
 504
 505         if(get_config_int(lookup_config(config_tree, "MACLength"), &myself->inmaclength)) {
 506                 if(myself->indigest) {
 507                         if(myself->inmaclength > myself->indigest->md_size) {
 508                                 logger(LOG_ERR, "MAC length exceeds size of digest!");
 509                                 return false;
 510                         } else if(myself->inmaclength < 0) {
 511                                 logger(LOG_ERR, "Bogus MAC length!");
 512                                 return false;
 513                         }
 514                 }
 515         } else
 516                 myself->inmaclength = 4;
 517
 518         myself->connection->outmaclength = 0;
 519
 520         /* Compression */
 521
 522         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 523                 if(myself->incompression < 0 || myself->incompression > 11) {
 524                         logger(LOG_ERR, "Bogus compression level!");
 525                         return false;
 526                 }
 527         } else
 528                 myself->incompression = 0;
 529
 530         myself->connection->outcompression = 0;
 531
 532         /* Done */
 533
 534         myself->nexthop = myself;
 535         myself->via = myself;
 536         myself->status.reachable = true;
 537         node_add(myself);
 538
 539         graph();
 540
 541         if(strictsubnets)
 542                 load_all_subnets();
 543
 544         /* Open device */
 545
 546         devops = os_devops;
 547
 548         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 549                 if(!strcasecmp(type, "dummy"))
 550                         devops = dummy_devops;
 551                 else if(!strcasecmp(type, "raw_socket"))
 552                         devops = raw_socket_devops;
 553 #ifdef ENABLE_UML
 554                 else if(!strcasecmp(type, "uml"))
 555                         devops = uml_devops;
 556 #endif
 557 #ifdef ENABLE_VDE
 558                 else if(!strcasecmp(type, "vde"))
 559                         devops = vde_devops;
 560 #endif
 561         }
 562
 563         if(!devops.setup())
 564                 return false;
 565
 566         /* Run tinc-up script to further initialize the tap interface */
 567         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 568         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 569         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 570         xasprintf(&envp[3], "NAME=%s", myself->name);
 571         envp[4] = NULL;
 572
 573         execute_script("tinc-up", envp);
 574
 575         for(i = 0; i < 5; i++)
 576                 free(envp[i]);
 577
 578         /* Run subnet-up scripts for our own subnets */
 579
 580         subnet_update(myself, NULL, true);
 581
 582         /* Open sockets */
 583
 584         listen_sockets = 0;
 585         cfg = lookup_config(config_tree, "BindToAddress");
 586
 587         do {
 588                 get_config_string(cfg, &address);
 589                 if(cfg)
 590                         cfg = lookup_config_next(config_tree, cfg);
 591
 592                 hint.ai_family = addressfamily;
 593                 hint.ai_socktype = SOCK_STREAM;
 594                 hint.ai_protocol = IPPROTO_TCP;
 595                 hint.ai_flags = AI_PASSIVE;
 596
 597                 err = getaddrinfo(address, myport, &hint, &ai);
 598                 free(address);
 599
 600                 if(err || !ai) {
 601                         logger(LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
 602                                    gai_strerror(err));
 603                         return false;
 604                 }
 605
 606                 for(aip = ai; aip; aip = aip->ai_next) {
 607                         if(listen_sockets >= MAXSOCKETS) {
 608                                 logger(LOG_ERR, "Too many listening sockets");
 609                                 return false;
 610                         }
 611
 612                         listen_socket[listen_sockets].tcp =
 613                                 setup_listen_socket((sockaddr_t *) aip->ai_addr);
 614
 615                         if(listen_socket[listen_sockets].tcp < 0)
 616                                 continue;
 617
 618                         listen_socket[listen_sockets].udp =
 619                                 setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 620
 621                         if(listen_socket[listen_sockets].udp < 0)
 622                                 continue;
 623
 624                         ifdebug(CONNECTIONS) {
 625                                 hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 626                                 logger(LOG_NOTICE, "Listening on %s", hostname);
 627                                 free(hostname);
 628                         }
 629
 630                         memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 631                         listen_sockets++;
 632                 }
 633
 634                 freeaddrinfo(ai);
 635         } while(cfg);
 636
 637         if(listen_sockets)
 638                 logger(LOG_NOTICE, "Ready");
 639         else {
 640                 logger(LOG_ERR, "Unable to create any listening socket!");
 641                 return false;
 642         }
 643
 644         return true;
 645 }
 646
 647 /*
 648   initialize network
 649 */
 650 bool setup_network(void) {
 651         now = time(NULL);
 652
 653         init_events();
 654         init_connections();
 655         init_subnets();
 656         init_nodes();
 657         init_edges();
 658         init_requests();
 659
 660         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 661                 if(pinginterval < 1) {
 662                         pinginterval = 86400;
 663                 }
 664         } else
 665                 pinginterval = 60;
 666
 667         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 668                 pingtimeout = 5;
 669         if(pingtimeout < 1 || pingtimeout > pinginterval)
 670                 pingtimeout = pinginterval;
 671
 672         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 673                 maxoutbufsize = 10 * MTU;
 674
 675         if(!setup_myself())
 676                 return false;
 677
 678         return true;
 679 }
 680
 681 /*
 682   close all open network connections
 683 */
 684 void close_network_connections(void) {
 685         avl_node_t *node, *next;
 686         connection_t *c;
 687         char *envp[5];
 688         int i;
 689
 690         for(node = connection_tree->head; node; node = next) {
 691                 next = node->next;
 692                 c = node->data;
 693                 c->outgoing = NULL;
 694                 terminate_connection(c, false);
 695         }
 696
 697         for(list_node_t *node = outgoing_list->head; node; node = node->next) {
 698                 outgoing_t *outgoing = node->data;
 699
 700                 if(outgoing->event)
 701                         event_del(outgoing->event);
 702         }
 703
 704         list_delete_list(outgoing_list);
 705
 706         if(myself && myself->connection) {
 707                 subnet_update(myself, NULL, false);
 708                 terminate_connection(myself->connection, false);
 709                 free_connection(myself->connection);
 710         }
 711
 712         for(i = 0; i < listen_sockets; i++) {
 713                 close(listen_socket[i].tcp);
 714                 close(listen_socket[i].udp);
 715         }
 716
 717         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 718         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 719         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 720         xasprintf(&envp[3], "NAME=%s", myself->name);
 721         envp[4] = NULL;
 722
 723         exit_requests();
 724         exit_edges();
 725         exit_subnets();
 726         exit_nodes();
 727         exit_connections();
 728         exit_events();
 729
 730         execute_script("tinc-down", envp);
 731
 732         if(myport) free(myport);
 733
 734         for(i = 0; i < 4; i++)
 735                 free(envp[i]);
 736
 737         devops.close();
 738
 739         return;
 740 }