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 char *get_name(void) {
 273         char *name = NULL;
 274
 275         get_config_string(lookup_config(config_tree, "Name"), &name);
 276
 277         if(!name)
 278                 return NULL;
 279
 280         if(*name == '$') {
 281                 char *envname = getenv(name + 1);
 282                 if(!envname) {
 283                         if(strcmp(name + 1, "HOST")) {
 284                                 fprintf(stderr, "Invalid Name: environment variable %s does not exist\n", name + 1);
 285                                 return false;
 286                         }
 287                         envname = alloca(32);
 288                         if(gethostname(envname, 32)) {
 289                                 fprintf(stderr, "Could not get hostname: %s\n", strerror(errno));
 290                                 return false;
 291                         }
 292                         envname[31] = 0;
 293                 }
 294                 free(name);
 295                 name = xstrdup(envname);
 296                 for(char *c = name; *c; c++)
 297                         if(!isalnum(*c))
 298                                 *c = '_';
 299         }
 300
 301         if(!check_id(name)) {
 302                 logger(LOG_ERR, "Invalid name for myself!");
 303                 free(name);
 304                 return false;
 305         }
 306
 307         return name;
 308 }
 309
 310 /*
 311   Configure node_t myself and set up the local sockets (listen only)
 312 */
 313 static bool setup_myself(void) {
 314         config_t *cfg;
 315         subnet_t *subnet;
 316         char *name, *hostname, *mode, *afname, *cipher, *digest, *type;
 317         char *fname = NULL;
 318         char *address = NULL;
 319         char *envp[5];
 320         struct addrinfo *ai, *aip, hint = {0};
 321         bool choice;
 322         int i, err;
 323         int replaywin_int;
 324
 325         myself = new_node();
 326         myself->connection = new_connection();
 327
 328         myself->hostname = xstrdup("MYSELF");
 329         myself->connection->hostname = xstrdup("MYSELF");
 330
 331         myself->connection->options = 0;
 332         myself->connection->protocol_version = PROT_CURRENT;
 333
 334         if(!(name = get_name())) {
 335                 logger(LOG_ERR, "Name for tinc daemon required!");
 336                 return false;
 337         }
 338
 339         myself->name = name;
 340         myself->connection->name = xstrdup(name);
 341         xasprintf(&fname, "%s/hosts/%s", confbase, name);
 342         read_config_options(config_tree, name);
 343         read_config_file(config_tree, fname);
 344         free(fname);
 345
 346         if(!read_rsa_private_key())
 347                 return false;
 348
 349         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 350                 myport = xstrdup("655");
 351
 352         if(!atoi(myport)) {
 353                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 354                 sockaddr_t sa;
 355                 if(!ai || !ai->ai_addr)
 356                         return false;
 357                 free(myport);
 358                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 359                 sockaddr2str(&sa, NULL, &myport);
 360         }
 361
 362         /* Read in all the subnets specified in the host configuration file */
 363
 364         cfg = lookup_config(config_tree, "Subnet");
 365
 366         while(cfg) {
 367                 if(!get_config_subnet(cfg, &subnet))
 368                         return false;
 369
 370                 subnet_add(myself, subnet);
 371
 372                 cfg = lookup_config_next(config_tree, cfg);
 373         }
 374
 375         /* Check some options */
 376
 377         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 378                 myself->options |= OPTION_INDIRECT;
 379
 380         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 381                 myself->options |= OPTION_TCPONLY;
 382
 383         if(myself->options & OPTION_TCPONLY)
 384                 myself->options |= OPTION_INDIRECT;
 385
 386         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 387         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 388         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 389         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 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         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 432         get_config_bool(lookup_config(config_tree, "Broadcast"), &broadcast);
 433
 434 #if !defined(SOL_IP) || !defined(IP_TOS)
 435         if(priorityinheritance)
 436                 logger(LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 437 #endif
 438
 439         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 440                 macexpire = 600;
 441
 442         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 443                 if(maxtimeout <= 0) {
 444                         logger(LOG_ERR, "Bogus maximum timeout!");
 445                         return false;
 446                 }
 447         } else
 448                 maxtimeout = 900;
 449
 450         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 451                 if(udp_rcvbuf <= 0) {
 452                         logger(LOG_ERR, "UDPRcvBuf cannot be negative!");
 453                         return false;
 454                 }
 455         }
 456
 457         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 458                 if(udp_sndbuf <= 0) {
 459                         logger(LOG_ERR, "UDPSndBuf cannot be negative!");
 460                         return false;
 461                 }
 462         }
 463
 464         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 465                 if(replaywin_int < 0) {
 466                         logger(LOG_ERR, "ReplayWindow cannot be negative!");
 467                         return false;
 468                 }
 469                 replaywin = (unsigned)replaywin_int;
 470         }
 471
 472         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 473                 if(!strcasecmp(afname, "IPv4"))
 474                         addressfamily = AF_INET;
 475                 else if(!strcasecmp(afname, "IPv6"))
 476                         addressfamily = AF_INET6;
 477                 else if(!strcasecmp(afname, "any"))
 478                         addressfamily = AF_UNSPEC;
 479                 else {
 480                         logger(LOG_ERR, "Invalid address family!");
 481                         return false;
 482                 }
 483                 free(afname);
 484         }
 485
 486         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 487
 488         /* Generate packet encryption key */
 489
 490         if(get_config_string
 491            (lookup_config(config_tree, "Cipher"), &cipher)) {
 492                 if(!strcasecmp(cipher, "none")) {
 493                         myself->incipher = NULL;
 494                 } else {
 495                         myself->incipher = EVP_get_cipherbyname(cipher);
 496
 497                         if(!myself->incipher) {
 498                                 logger(LOG_ERR, "Unrecognized cipher type!");
 499                                 return false;
 500                         }
 501                 }
 502         } else
 503                 myself->incipher = EVP_bf_cbc();
 504
 505         if(myself->incipher)
 506                 myself->inkeylength = myself->incipher->key_len + myself->incipher->iv_len;
 507         else
 508                 myself->inkeylength = 1;
 509
 510         myself->connection->outcipher = EVP_bf_ofb();
 511
 512         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 513                 keylifetime = 3600;
 514
 515         keyexpires = now + keylifetime;
 516
 517         /* Check if we want to use message authentication codes... */
 518
 519         if(get_config_string(lookup_config(config_tree, "Digest"), &digest)) {
 520                 if(!strcasecmp(digest, "none")) {
 521                         myself->indigest = NULL;
 522                 } else {
 523                         myself->indigest = EVP_get_digestbyname(digest);
 524
 525                         if(!myself->indigest) {
 526                                 logger(LOG_ERR, "Unrecognized digest type!");
 527                                 return false;
 528                         }
 529                 }
 530         } else
 531                 myself->indigest = EVP_sha1();
 532
 533         myself->connection->outdigest = EVP_sha1();
 534
 535         if(get_config_int(lookup_config(config_tree, "MACLength"), &myself->inmaclength)) {
 536                 if(myself->indigest) {
 537                         if(myself->inmaclength > myself->indigest->md_size) {
 538                                 logger(LOG_ERR, "MAC length exceeds size of digest!");
 539                                 return false;
 540                         } else if(myself->inmaclength < 0) {
 541                                 logger(LOG_ERR, "Bogus MAC length!");
 542                                 return false;
 543                         }
 544                 }
 545         } else
 546                 myself->inmaclength = 4;
 547
 548         myself->connection->outmaclength = 0;
 549
 550         /* Compression */
 551
 552         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 553                 if(myself->incompression < 0 || myself->incompression > 11) {
 554                         logger(LOG_ERR, "Bogus compression level!");
 555                         return false;
 556                 }
 557         } else
 558                 myself->incompression = 0;
 559
 560         myself->connection->outcompression = 0;
 561
 562         /* Done */
 563
 564         myself->nexthop = myself;
 565         myself->via = myself;
 566         myself->status.reachable = true;
 567         node_add(myself);
 568
 569         graph();
 570
 571         if(strictsubnets)
 572                 load_all_subnets();
 573
 574         /* Open device */
 575
 576         devops = os_devops;
 577
 578         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 579                 if(!strcasecmp(type, "dummy"))
 580                         devops = dummy_devops;
 581                 else if(!strcasecmp(type, "raw_socket"))
 582                         devops = raw_socket_devops;
 583                 else if(!strcasecmp(type, "multicast"))
 584                         devops = multicast_devops;
 585 #ifdef ENABLE_UML
 586                 else if(!strcasecmp(type, "uml"))
 587                         devops = uml_devops;
 588 #endif
 589 #ifdef ENABLE_VDE
 590                 else if(!strcasecmp(type, "vde"))
 591                         devops = vde_devops;
 592 #endif
 593         }
 594
 595         if(!devops.setup())
 596                 return false;
 597
 598         /* Run tinc-up script to further initialize the tap interface */
 599         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 600         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 601         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 602         xasprintf(&envp[3], "NAME=%s", myself->name);
 603         envp[4] = NULL;
 604
 605         execute_script("tinc-up", envp);
 606
 607         for(i = 0; i < 5; i++)
 608                 free(envp[i]);
 609
 610         /* Run subnet-up scripts for our own subnets */
 611
 612         subnet_update(myself, NULL, true);
 613
 614         /* Open sockets */
 615
 616         if(!do_detach && getenv("LISTEN_FDS")) {
 617                 sockaddr_t sa;
 618                 socklen_t salen;
 619
 620                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 621 #ifdef HAVE_UNSETENV
 622                 unsetenv("LISTEN_FDS");
 623 #endif
 624
 625                 if(listen_sockets > MAXSOCKETS) {
 626                         logger(LOG_ERR, "Too many listening sockets");
 627                         return false;
 628                 }
 629
 630                 for(i = 0; i < listen_sockets; i++) {
 631                         salen = sizeof sa;
 632                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 633                                 logger(LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
 634                                 return false;
 635                         }
 636
 637                         listen_socket[i].tcp = i + 3;
 638
 639 #ifdef FD_CLOEXEC
 640                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 641 #endif
 642
 643                         listen_socket[i].udp = setup_vpn_in_socket(&sa);
 644                         if(listen_socket[i].udp < 0)
 645                                 return false;
 646
 647                         ifdebug(CONNECTIONS) {
 648                                 hostname = sockaddr2hostname(&sa);
 649                                 logger(LOG_NOTICE, "Listening on %s", hostname);
 650                                 free(hostname);
 651                         }
 652
 653                         memcpy(&listen_socket[i].sa, &sa, salen);
 654                 }
 655         } else {
 656                 listen_sockets = 0;
 657                 cfg = lookup_config(config_tree, "BindToAddress");
 658
 659                 do {
 660                         get_config_string(cfg, &address);
 661                         if(cfg)
 662                                 cfg = lookup_config_next(config_tree, cfg);
 663
 664                         char *port = myport;
 665
 666                         if(address) {
 667                                 char *space = strchr(address, ' ');
 668                                 if(space) {
 669                                         *space++ = 0;
 670                                         port = space;
 671                                 }
 672
 673                                 if(!strcmp(address, "*"))
 674                                         *address = 0;
 675                         }
 676
 677                         hint.ai_family = addressfamily;
 678                         hint.ai_socktype = SOCK_STREAM;
 679                         hint.ai_protocol = IPPROTO_TCP;
 680                         hint.ai_flags = AI_PASSIVE;
 681
 682                         err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 683                         free(address);
 684
 685                         if(err || !ai) {
 686                                 logger(LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
 687                                            gai_strerror(err));
 688                                 return false;
 689                         }
 690
 691                         for(aip = ai; aip; aip = aip->ai_next) {
 692                                 if(listen_sockets >= MAXSOCKETS) {
 693                                         logger(LOG_ERR, "Too many listening sockets");
 694                                         return false;
 695                                 }
 696
 697                                 listen_socket[listen_sockets].tcp =
 698                                         setup_listen_socket((sockaddr_t *) aip->ai_addr);
 699
 700                                 if(listen_socket[listen_sockets].tcp < 0)
 701                                         continue;
 702
 703                                 listen_socket[listen_sockets].udp =
 704                                         setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 705
 706                                 if(listen_socket[listen_sockets].udp < 0)
 707                                         continue;
 708
 709                                 ifdebug(CONNECTIONS) {
 710                                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 711                                         logger(LOG_NOTICE, "Listening on %s", hostname);
 712                                         free(hostname);
 713                                 }
 714
 715                                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 716                                 listen_sockets++;
 717                         }
 718
 719                         freeaddrinfo(ai);
 720                 } while(cfg);
 721         }
 722
 723         if(listen_sockets)
 724                 logger(LOG_NOTICE, "Ready");
 725         else {
 726                 logger(LOG_ERR, "Unable to create any listening socket!");
 727                 return false;
 728         }
 729
 730         return true;
 731 }
 732
 733 /*
 734   initialize network
 735 */
 736 bool setup_network(void) {
 737         now = time(NULL);
 738
 739         init_events();
 740         init_connections();
 741         init_subnets();
 742         init_nodes();
 743         init_edges();
 744         init_requests();
 745
 746         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 747                 if(pinginterval < 1) {
 748                         pinginterval = 86400;
 749                 }
 750         } else
 751                 pinginterval = 60;
 752
 753         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 754                 pingtimeout = 5;
 755         if(pingtimeout < 1 || pingtimeout > pinginterval)
 756                 pingtimeout = pinginterval;
 757
 758         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 759                 maxoutbufsize = 10 * MTU;
 760
 761         if(!setup_myself())
 762                 return false;
 763
 764         return true;
 765 }
 766
 767 /*
 768   close all open network connections
 769 */
 770 void close_network_connections(void) {
 771         avl_node_t *node, *next;
 772         connection_t *c;
 773         char *envp[5];
 774         int i;
 775
 776         for(node = connection_tree->head; node; node = next) {
 777                 next = node->next;
 778                 c = node->data;
 779                 c->outgoing = NULL;
 780                 terminate_connection(c, false);
 781         }
 782
 783         for(list_node_t *node = outgoing_list->head; node; node = node->next) {
 784                 outgoing_t *outgoing = node->data;
 785
 786                 if(outgoing->event)
 787                         event_del(outgoing->event);
 788         }
 789
 790         list_delete_list(outgoing_list);
 791
 792         if(myself && myself->connection) {
 793                 subnet_update(myself, NULL, false);
 794                 terminate_connection(myself->connection, false);
 795                 free_connection(myself->connection);
 796         }
 797
 798         for(i = 0; i < listen_sockets; i++) {
 799                 close(listen_socket[i].tcp);
 800                 close(listen_socket[i].udp);
 801         }
 802
 803         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 804         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 805         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 806         xasprintf(&envp[3], "NAME=%s", myself->name);
 807         envp[4] = NULL;
 808
 809         exit_requests();
 810         exit_edges();
 811         exit_subnets();
 812         exit_nodes();
 813         exit_connections();
 814         exit_events();
 815
 816         execute_script("tinc-down", envp);
 817
 818         if(myport) free(myport);
 819
 820         for(i = 0; i < 4; i++)
 821                 free(envp[i]);
 822
 823         devops.close();
 824
 825         return;
 826 }