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
 225         xasprintf(&dname, "%s/hosts", confbase);
 226         dir = opendir(dname);
 227         if(!dir) {
 228                 logger(LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 229                 free(dname);
 230                 return;
 231         }
 232
 233         while((ent = readdir(dir))) {
 234                 if(!check_id(ent->d_name))
 235                         continue;
 236
 237                 n = lookup_node(ent->d_name);
 238                 #ifdef _DIRENT_HAVE_D_TYPE
 239                 //if(ent->d_type != DT_REG)
 240                 //      continue;
 241                 #endif
 242
 243                 xasprintf(&fname, "%s/hosts/%s", confbase, ent->d_name);
 244                 init_configuration(&config_tree);
 245                 read_config_options(config_tree, ent->d_name);
 246                 read_config_file(config_tree, fname);
 247                 free(fname);
 248
 249                 if(!n) {
 250                         n = new_node();
 251                         n->name = xstrdup(ent->d_name);
 252                         node_add(n);
 253                 }
 254
 255                 for(cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 256                         if(!get_config_subnet(cfg, &s))
 257                                 continue;
 258
 259                         if((s2 = lookup_subnet(n, s))) {
 260                                 s2->expires = -1;
 261                         } else {
 262                                 subnet_add(n, s);
 263                         }
 264                 }
 265
 266                 exit_configuration(&config_tree);
 267         }
 268
 269         closedir(dir);
 270 }
 271
 272 /*
 273   Configure node_t myself and set up the local sockets (listen only)
 274 */
 275 static bool setup_myself(void) {
 276         config_t *cfg;
 277         subnet_t *subnet;
 278         char *name, *hostname, *mode, *afname, *cipher, *digest, *type;
 279         char *fname = NULL;
 280         char *address = NULL;
 281         char *envp[5];
 282         struct addrinfo *ai, *aip, hint = {0};
 283         bool choice;
 284         int i, err;
 285         int replaywin_int;
 286
 287         myself = new_node();
 288         myself->connection = new_connection();
 289
 290         myself->hostname = xstrdup("MYSELF");
 291         myself->connection->hostname = xstrdup("MYSELF");
 292
 293         myself->connection->options = 0;
 294         myself->connection->protocol_version = PROT_CURRENT;
 295
 296         if(!get_config_string(lookup_config(config_tree, "Name"), &name)) {     /* Not acceptable */
 297                 logger(LOG_ERR, "Name for tinc daemon required!");
 298                 return false;
 299         }
 300
 301         if(!check_id(name)) {
 302                 logger(LOG_ERR, "Invalid name for myself!");
 303                 free(name);
 304                 return false;
 305         }
 306
 307         myself->name = name;
 308         myself->connection->name = xstrdup(name);
 309         xasprintf(&fname, "%s/hosts/%s", confbase, name);
 310         read_config_options(config_tree, name);
 311         read_config_file(config_tree, fname);
 312         free(fname);
 313
 314         if(!read_rsa_private_key())
 315                 return false;
 316
 317         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 318                 myport = xstrdup("655");
 319
 320         if(!atoi(myport)) {
 321                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 322                 sockaddr_t sa;
 323                 if(!ai || !ai->ai_addr)
 324                         return false;
 325                 free(myport);
 326                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 327                 sockaddr2str(&sa, NULL, &myport);
 328         }
 329
 330         /* Read in all the subnets specified in the host configuration file */
 331
 332         cfg = lookup_config(config_tree, "Subnet");
 333
 334         while(cfg) {
 335                 if(!get_config_subnet(cfg, &subnet))
 336                         return false;
 337
 338                 subnet_add(myself, subnet);
 339
 340                 cfg = lookup_config_next(config_tree, cfg);
 341         }
 342
 343         /* Check some options */
 344
 345         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 346                 myself->options |= OPTION_INDIRECT;
 347
 348         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 349                 myself->options |= OPTION_TCPONLY;
 350
 351         if(myself->options & OPTION_TCPONLY)
 352                 myself->options |= OPTION_INDIRECT;
 353
 354         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 355         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 356         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 357         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 358         strictsubnets |= tunnelserver;
 359
 360         if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
 361                 if(!strcasecmp(mode, "router"))
 362                         routing_mode = RMODE_ROUTER;
 363                 else if(!strcasecmp(mode, "switch"))
 364                         routing_mode = RMODE_SWITCH;
 365                 else if(!strcasecmp(mode, "hub"))
 366                         routing_mode = RMODE_HUB;
 367                 else {
 368                         logger(LOG_ERR, "Invalid routing mode!");
 369                         return false;
 370                 }
 371                 free(mode);
 372         }
 373
 374         if(get_config_string(lookup_config(config_tree, "Forwarding"), &mode)) {
 375                 if(!strcasecmp(mode, "off"))
 376                         forwarding_mode = FMODE_OFF;
 377                 else if(!strcasecmp(mode, "internal"))
 378                         forwarding_mode = FMODE_INTERNAL;
 379                 else if(!strcasecmp(mode, "kernel"))
 380                         forwarding_mode = FMODE_KERNEL;
 381                 else {
 382                         logger(LOG_ERR, "Invalid forwarding mode!");
 383                         return false;
 384                 }
 385                 free(mode);
 386         }
 387
 388         choice = true;
 389         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 390         if(choice)
 391                 myself->options |= OPTION_PMTU_DISCOVERY;
 392
 393         choice = true;
 394         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 395         if(choice)
 396                 myself->options |= OPTION_CLAMP_MSS;
 397
 398         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 399         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 400         get_config_bool(lookup_config(config_tree, "Broadcast"), &broadcast);
 401
 402 #if !defined(SOL_IP) || !defined(IP_TOS)
 403         if(priorityinheritance)
 404                 logger(LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 405 #endif
 406
 407         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 408                 macexpire = 600;
 409
 410         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 411                 if(maxtimeout <= 0) {
 412                         logger(LOG_ERR, "Bogus maximum timeout!");
 413                         return false;
 414                 }
 415         } else
 416                 maxtimeout = 900;
 417
 418         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 419                 if(udp_rcvbuf <= 0) {
 420                         logger(LOG_ERR, "UDPRcvBuf cannot be negative!");
 421                         return false;
 422                 }
 423         }
 424
 425         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 426                 if(udp_sndbuf <= 0) {
 427                         logger(LOG_ERR, "UDPSndBuf cannot be negative!");
 428                         return false;
 429                 }
 430         }
 431
 432         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 433                 if(replaywin_int < 0) {
 434                         logger(LOG_ERR, "ReplayWindow cannot be negative!");
 435                         return false;
 436                 }
 437                 replaywin = (unsigned)replaywin_int;
 438         }
 439
 440         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 441                 if(!strcasecmp(afname, "IPv4"))
 442                         addressfamily = AF_INET;
 443                 else if(!strcasecmp(afname, "IPv6"))
 444                         addressfamily = AF_INET6;
 445                 else if(!strcasecmp(afname, "any"))
 446                         addressfamily = AF_UNSPEC;
 447                 else {
 448                         logger(LOG_ERR, "Invalid address family!");
 449                         return false;
 450                 }
 451                 free(afname);
 452         }
 453
 454         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 455
 456         /* Generate packet encryption key */
 457
 458         if(get_config_string
 459            (lookup_config(config_tree, "Cipher"), &cipher)) {
 460                 if(!strcasecmp(cipher, "none")) {
 461                         myself->incipher = NULL;
 462                 } else {
 463                         myself->incipher = EVP_get_cipherbyname(cipher);
 464
 465                         if(!myself->incipher) {
 466                                 logger(LOG_ERR, "Unrecognized cipher type!");
 467                                 return false;
 468                         }
 469                 }
 470         } else
 471                 myself->incipher = EVP_bf_cbc();
 472
 473         if(myself->incipher)
 474                 myself->inkeylength = myself->incipher->key_len + myself->incipher->iv_len;
 475         else
 476                 myself->inkeylength = 1;
 477
 478         myself->connection->outcipher = EVP_bf_ofb();
 479
 480         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 481                 keylifetime = 3600;
 482
 483         keyexpires = now + keylifetime;
 484
 485         /* Check if we want to use message authentication codes... */
 486
 487         if(get_config_string(lookup_config(config_tree, "Digest"), &digest)) {
 488                 if(!strcasecmp(digest, "none")) {
 489                         myself->indigest = NULL;
 490                 } else {
 491                         myself->indigest = EVP_get_digestbyname(digest);
 492
 493                         if(!myself->indigest) {
 494                                 logger(LOG_ERR, "Unrecognized digest type!");
 495                                 return false;
 496                         }
 497                 }
 498         } else
 499                 myself->indigest = EVP_sha1();
 500
 501         myself->connection->outdigest = EVP_sha1();
 502
 503         if(get_config_int(lookup_config(config_tree, "MACLength"), &myself->inmaclength)) {
 504                 if(myself->indigest) {
 505                         if(myself->inmaclength > myself->indigest->md_size) {
 506                                 logger(LOG_ERR, "MAC length exceeds size of digest!");
 507                                 return false;
 508                         } else if(myself->inmaclength < 0) {
 509                                 logger(LOG_ERR, "Bogus MAC length!");
 510                                 return false;
 511                         }
 512                 }
 513         } else
 514                 myself->inmaclength = 4;
 515
 516         myself->connection->outmaclength = 0;
 517
 518         /* Compression */
 519
 520         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 521                 if(myself->incompression < 0 || myself->incompression > 11) {
 522                         logger(LOG_ERR, "Bogus compression level!");
 523                         return false;
 524                 }
 525         } else
 526                 myself->incompression = 0;
 527
 528         myself->connection->outcompression = 0;
 529
 530         /* Done */
 531
 532         myself->nexthop = myself;
 533         myself->via = myself;
 534         myself->status.reachable = true;
 535         node_add(myself);
 536
 537         graph();
 538
 539         if(strictsubnets)
 540                 load_all_subnets();
 541
 542         /* Open device */
 543
 544         devops = os_devops;
 545
 546         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 547                 if(!strcasecmp(type, "dummy"))
 548                         devops = dummy_devops;
 549                 else if(!strcasecmp(type, "raw_socket"))
 550                         devops = raw_socket_devops;
 551                 else if(!strcasecmp(type, "multicast"))
 552                         devops = multicast_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                 char *port = myport;
 593
 594                 if(address) {
 595                         char *space = strchr(address, ' ');
 596                         if(space) {
 597                                 *space++ = 0;
 598                                 port = space;
 599                         }
 600
 601                         if(!strcmp(address, "*"))
 602                                 *address = 0;
 603                 }
 604
 605                 hint.ai_family = addressfamily;
 606                 hint.ai_socktype = SOCK_STREAM;
 607                 hint.ai_protocol = IPPROTO_TCP;
 608                 hint.ai_flags = AI_PASSIVE;
 609
 610                 err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 611                 free(address);
 612
 613                 if(err || !ai) {
 614                         logger(LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
 615                                    gai_strerror(err));
 616                         return false;
 617                 }
 618
 619                 for(aip = ai; aip; aip = aip->ai_next) {
 620                         if(listen_sockets >= MAXSOCKETS) {
 621                                 logger(LOG_ERR, "Too many listening sockets");
 622                                 return false;
 623                         }
 624
 625                         listen_socket[listen_sockets].tcp =
 626                                 setup_listen_socket((sockaddr_t *) aip->ai_addr);
 627
 628                         if(listen_socket[listen_sockets].tcp < 0)
 629                                 continue;
 630
 631                         listen_socket[listen_sockets].udp =
 632                                 setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 633
 634                         if(listen_socket[listen_sockets].udp < 0)
 635                                 continue;
 636
 637                         ifdebug(CONNECTIONS) {
 638                                 hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 639                                 logger(LOG_NOTICE, "Listening on %s", hostname);
 640                                 free(hostname);
 641                         }
 642
 643                         memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 644                         listen_sockets++;
 645                 }
 646
 647                 freeaddrinfo(ai);
 648         } while(cfg);
 649
 650         if(listen_sockets)
 651                 logger(LOG_NOTICE, "Ready");
 652         else {
 653                 logger(LOG_ERR, "Unable to create any listening socket!");
 654                 return false;
 655         }
 656
 657         return true;
 658 }
 659
 660 /*
 661   initialize network
 662 */
 663 bool setup_network(void) {
 664         now = time(NULL);
 665
 666         init_events();
 667         init_connections();
 668         init_subnets();
 669         init_nodes();
 670         init_edges();
 671         init_requests();
 672
 673         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 674                 if(pinginterval < 1) {
 675                         pinginterval = 86400;
 676                 }
 677         } else
 678                 pinginterval = 60;
 679
 680         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 681                 pingtimeout = 5;
 682         if(pingtimeout < 1 || pingtimeout > pinginterval)
 683                 pingtimeout = pinginterval;
 684
 685         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 686                 maxoutbufsize = 10 * MTU;
 687
 688         if(!setup_myself())
 689                 return false;
 690
 691         return true;
 692 }
 693
 694 /*
 695   close all open network connections
 696 */
 697 void close_network_connections(void) {
 698         avl_node_t *node, *next;
 699         connection_t *c;
 700         char *envp[5];
 701         int i;
 702
 703         for(node = connection_tree->head; node; node = next) {
 704                 next = node->next;
 705                 c = node->data;
 706                 c->outgoing = NULL;
 707                 terminate_connection(c, false);
 708         }
 709
 710         for(list_node_t *node = outgoing_list->head; node; node = node->next) {
 711                 outgoing_t *outgoing = node->data;
 712
 713                 if(outgoing->event)
 714                         event_del(outgoing->event);
 715         }
 716
 717         list_delete_list(outgoing_list);
 718
 719         if(myself && myself->connection) {
 720                 subnet_update(myself, NULL, false);
 721                 terminate_connection(myself->connection, false);
 722                 free_connection(myself->connection);
 723         }
 724
 725         for(i = 0; i < listen_sockets; i++) {
 726                 close(listen_socket[i].tcp);
 727                 close(listen_socket[i].udp);
 728         }
 729
 730         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 731         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 732         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 733         xasprintf(&envp[3], "NAME=%s", myself->name);
 734         envp[4] = NULL;
 735
 736         exit_requests();
 737         exit_edges();
 738         exit_subnets();
 739         exit_nodes();
 740         exit_connections();
 741         exit_events();
 742
 743         execute_script("tinc-down", envp);
 744
 745         if(myport) free(myport);
 746
 747         for(i = 0; i < 4; i++)
 748                 free(envp[i]);
 749
 750         devops.close();
 751
 752         return;
 753 }