git.meshlink.io Git - meshlink/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 "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 devops_t devops;
  48
  49 bool node_read_ecdsa_public_key(node_t *n) {
  50         if(ecdsa_active(&n->ecdsa))
  51                 return true;
  52
  53         splay_tree_t *config_tree;
  54         FILE *fp;
  55         char *fname;
  56         char *p;
  57         bool result = false;
  58
  59         xasprintf(&fname, "%s/hosts/%s", confbase, n->name);
  60
  61         init_configuration(&config_tree);
  62         if(!read_config_file(config_tree, fname))
  63                 goto exit;
  64
  65         /* First, check for simple ECDSAPublicKey statement */
  66
  67         if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
  68                 result = ecdsa_set_base64_public_key(&n->ecdsa, p);
  69                 free(p);
  70                 goto exit;
  71         }
  72
  73         /* Else, check for ECDSAPublicKeyFile statement and read it */
  74
  75         free(fname);
  76
  77         if(!get_config_string(lookup_config(config_tree, "ECDSAPublicKeyFile"), &fname))
  78                 xasprintf(&fname, "%s/hosts/%s", confbase, n->name);
  79
  80         fp = fopen(fname, "r");
  81
  82         if(!fp) {
  83                 logger(LOG_ERR, "Error reading ECDSA public key file `%s': %s", fname, strerror(errno));
  84                 goto exit;
  85         }
  86
  87         result = ecdsa_read_pem_public_key(&n->ecdsa, fp);
  88         fclose(fp);
  89
  90 exit:
  91         exit_configuration(&config_tree);
  92         free(fname);
  93         return result;
  94 }
  95
  96 bool read_ecdsa_public_key(connection_t *c) {
  97         FILE *fp;
  98         char *fname;
  99         char *p;
 100         bool result;
 101
 102         /* First, check for simple ECDSAPublicKey statement */
 103
 104         if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
 105                 result = ecdsa_set_base64_public_key(&c->ecdsa, p);
 106                 free(p);
 107                 return result;
 108         }
 109
 110         /* Else, check for ECDSAPublicKeyFile statement and read it */
 111
 112         if(!get_config_string(lookup_config(c->config_tree, "ECDSAPublicKeyFile"), &fname))
 113                 xasprintf(&fname, "%s/hosts/%s", confbase, c->name);
 114
 115         fp = fopen(fname, "r");
 116
 117         if(!fp) {
 118                 logger(LOG_ERR, "Error reading ECDSA public key file `%s': %s",
 119                            fname, strerror(errno));
 120                 free(fname);
 121                 return false;
 122         }
 123
 124         result = ecdsa_read_pem_public_key(&c->ecdsa, fp);
 125         fclose(fp);
 126
 127         if(!result)
 128                 logger(LOG_ERR, "Reading ECDSA public key file `%s' failed: %s", fname, strerror(errno));
 129         free(fname);
 130         return result;
 131 }
 132
 133 bool read_rsa_public_key(connection_t *c) {
 134         FILE *fp;
 135         char *fname;
 136         char *n;
 137         bool result;
 138
 139         /* First, check for simple PublicKey statement */
 140
 141         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 142                 result = rsa_set_hex_public_key(&c->rsa, n, "FFFF");
 143                 free(n);
 144                 return result;
 145         }
 146
 147         /* Else, check for PublicKeyFile statement and read it */
 148
 149         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 150                 xasprintf(&fname, "%s/hosts/%s", confbase, c->name);
 151
 152         fp = fopen(fname, "r");
 153
 154         if(!fp) {
 155                 logger(LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 156                 free(fname);
 157                 return false;
 158         }
 159
 160         result = rsa_read_pem_public_key(&c->rsa, fp);
 161         fclose(fp);
 162
 163         if(!result)
 164                 logger(LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 165         free(fname);
 166         return result;
 167 }
 168
 169 static bool read_ecdsa_private_key(void) {
 170         FILE *fp;
 171         char *fname;
 172         bool result;
 173
 174         /* Check for PrivateKeyFile statement and read it */
 175
 176         if(!get_config_string(lookup_config(config_tree, "ECDSAPrivateKeyFile"), &fname))
 177                 xasprintf(&fname, "%s/ecdsa_key.priv", confbase);
 178
 179         fp = fopen(fname, "r");
 180
 181         if(!fp) {
 182                 logger(LOG_ERR, "Error reading ECDSA private key file `%s': %s", fname, strerror(errno));
 183                 free(fname);
 184                 return false;
 185         }
 186
 187 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 188         struct stat s;
 189
 190         if(fstat(fileno(fp), &s)) {
 191                 logger(LOG_ERR, "Could not stat ECDSA private key file `%s': %s'", fname, strerror(errno));
 192                 free(fname);
 193                 return false;
 194         }
 195
 196         if(s.st_mode & ~0100700)
 197                 logger(LOG_WARNING, "Warning: insecure file permissions for ECDSA private key file `%s'!", fname);
 198 #endif
 199
 200         result = ecdsa_read_pem_private_key(&myself->connection->ecdsa, fp);
 201         fclose(fp);
 202
 203         if(!result)
 204                 logger(LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 205         free(fname);
 206         return result;
 207 }
 208
 209 static bool read_rsa_private_key(void) {
 210         FILE *fp;
 211         char *fname;
 212         char *n, *d;
 213         bool result;
 214
 215         /* First, check for simple PrivateKey statement */
 216
 217         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 218                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 219                         logger(LOG_ERR, "PrivateKey used but no PublicKey found!");
 220                         free(d);
 221                         return false;
 222                 }
 223                 result = rsa_set_hex_private_key(&myself->connection->rsa, n, "FFFF", d);
 224                 free(n);
 225                 free(d);
 226                 return true;
 227         }
 228
 229         /* Else, check for PrivateKeyFile statement and read it */
 230
 231         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 232                 xasprintf(&fname, "%s/rsa_key.priv", confbase);
 233
 234         fp = fopen(fname, "r");
 235
 236         if(!fp) {
 237                 logger(LOG_ERR, "Error reading RSA private key file `%s': %s",
 238                            fname, strerror(errno));
 239                 free(fname);
 240                 return false;
 241         }
 242
 243 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 244         struct stat s;
 245
 246         if(fstat(fileno(fp), &s)) {
 247                 logger(LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 248                 free(fname);
 249                 return false;
 250         }
 251
 252         if(s.st_mode & ~0100700)
 253                 logger(LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 254 #endif
 255
 256         result = rsa_read_pem_private_key(&myself->connection->rsa, fp);
 257         fclose(fp);
 258
 259         if(!result)
 260                 logger(LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 261         free(fname);
 262         return result;
 263 }
 264
 265 static struct event keyexpire_event;
 266
 267 static void keyexpire_handler(int fd, short events, void *data) {
 268         regenerate_key();
 269 }
 270
 271 void regenerate_key(void) {
 272         if(timeout_initialized(&keyexpire_event)) {
 273                 ifdebug(STATUS) logger(LOG_INFO, "Expiring symmetric keys");
 274                 event_del(&keyexpire_event);
 275                 send_key_changed();
 276         } else {
 277                 timeout_set(&keyexpire_event, keyexpire_handler, NULL);
 278         }
 279
 280         event_add(&keyexpire_event, &(struct timeval){keylifetime, 0});
 281 }
 282
 283 /*
 284   Read Subnets from all host config files
 285 */
 286 void load_all_subnets(void) {
 287         DIR *dir;
 288         struct dirent *ent;
 289         char *dname;
 290         char *fname;
 291         splay_tree_t *config_tree;
 292         config_t *cfg;
 293         subnet_t *s, *s2;
 294         node_t *n;
 295         bool result;
 296
 297         xasprintf(&dname, "%s/hosts", confbase);
 298         dir = opendir(dname);
 299         if(!dir) {
 300                 logger(LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 301                 free(dname);
 302                 return;
 303         }
 304
 305         while((ent = readdir(dir))) {
 306                 if(!check_id(ent->d_name))
 307                         continue;
 308
 309                 n = lookup_node(ent->d_name);
 310                 #ifdef _DIRENT_HAVE_D_TYPE
 311                 //if(ent->d_type != DT_REG)
 312                 //      continue;
 313                 #endif
 314
 315                 xasprintf(&fname, "%s/hosts/%s", confbase, ent->d_name);
 316                 init_configuration(&config_tree);
 317                 result = read_config_file(config_tree, fname);
 318                 free(fname);
 319                 if(!result)
 320                         continue;
 321
 322                 if(!n) {
 323                         n = new_node();
 324                         n->name = xstrdup(ent->d_name);
 325                         node_add(n);
 326                 }
 327
 328                 for(cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 329                         if(!get_config_subnet(cfg, &s))
 330                                 continue;
 331
 332                         if((s2 = lookup_subnet(n, s))) {
 333                                 s2->expires = -1;
 334                         } else {
 335                                 subnet_add(n, s);
 336                         }
 337                 }
 338
 339                 exit_configuration(&config_tree);
 340         }
 341
 342         closedir(dir);
 343 }
 344
 345 /*
 346   Configure node_t myself and set up the local sockets (listen only)
 347 */
 348 static bool setup_myself(void) {
 349         config_t *cfg;
 350         subnet_t *subnet;
 351         char *name, *hostname, *mode, *afname, *cipher, *digest, *type;
 352         char *fname = NULL;
 353         char *address = NULL;
 354         char *envp[5];
 355         struct addrinfo *ai, *aip, hint = {0};
 356         bool choice;
 357         int i, err;
 358         int replaywin_int;
 359
 360         myself = new_node();
 361         myself->connection = new_connection();
 362
 363         myself->hostname = xstrdup("MYSELF");
 364         myself->connection->hostname = xstrdup("MYSELF");
 365
 366         myself->connection->options = 0;
 367         myself->connection->protocol_major = PROT_MAJOR;
 368         myself->connection->protocol_minor = PROT_MINOR;
 369
 370         if(!get_config_string(lookup_config(config_tree, "Name"), &name)) {     /* Not acceptable */
 371                 logger(LOG_ERR, "Name for tinc daemon required!");
 372                 return false;
 373         }
 374
 375         if(!check_id(name)) {
 376                 logger(LOG_ERR, "Invalid name for myself!");
 377                 free(name);
 378                 return false;
 379         }
 380
 381         myself->name = name;
 382         myself->connection->name = xstrdup(name);
 383         xasprintf(&fname, "%s/hosts/%s", confbase, name);
 384         read_config_options(config_tree, name);
 385         read_config_file(config_tree, fname);
 386         free(fname);
 387
 388         get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental);
 389
 390         if(experimental && !read_ecdsa_private_key())
 391                 return false;
 392
 393         if(!read_rsa_private_key())
 394                 return false;
 395
 396         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 397                 myport = xstrdup("655");
 398
 399         if(!atoi(myport)) {
 400                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 401                 sockaddr_t sa;
 402                 if(!ai || !ai->ai_addr)
 403                         return false;
 404                 free(myport);
 405                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 406                 sockaddr2str(&sa, NULL, &myport);
 407         }
 408
 409         /* Read in all the subnets specified in the host configuration file */
 410
 411         cfg = lookup_config(config_tree, "Subnet");
 412
 413         while(cfg) {
 414                 if(!get_config_subnet(cfg, &subnet))
 415                         return false;
 416
 417                 subnet_add(myself, subnet);
 418
 419                 cfg = lookup_config_next(config_tree, cfg);
 420         }
 421
 422         /* Check some options */
 423
 424         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 425                 myself->options |= OPTION_INDIRECT;
 426
 427         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 428                 myself->options |= OPTION_TCPONLY;
 429
 430         if(myself->options & OPTION_TCPONLY)
 431                 myself->options |= OPTION_INDIRECT;
 432
 433         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 434         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 435         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 436         strictsubnets |= tunnelserver;
 437
 438         if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
 439                 if(!strcasecmp(mode, "router"))
 440                         routing_mode = RMODE_ROUTER;
 441                 else if(!strcasecmp(mode, "switch"))
 442                         routing_mode = RMODE_SWITCH;
 443                 else if(!strcasecmp(mode, "hub"))
 444                         routing_mode = RMODE_HUB;
 445                 else {
 446                         logger(LOG_ERR, "Invalid routing mode!");
 447                         return false;
 448                 }
 449                 free(mode);
 450         }
 451
 452         if(get_config_string(lookup_config(config_tree, "Forwarding"), &mode)) {
 453                 if(!strcasecmp(mode, "off"))
 454                         forwarding_mode = FMODE_OFF;
 455                 else if(!strcasecmp(mode, "internal"))
 456                         forwarding_mode = FMODE_INTERNAL;
 457                 else if(!strcasecmp(mode, "kernel"))
 458                         forwarding_mode = FMODE_KERNEL;
 459                 else {
 460                         logger(LOG_ERR, "Invalid forwarding mode!");
 461                         return false;
 462                 }
 463                 free(mode);
 464         }
 465
 466         choice = true;
 467         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 468         if(choice)
 469                 myself->options |= OPTION_PMTU_DISCOVERY;
 470
 471         choice = true;
 472         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 473         if(choice)
 474                 myself->options |= OPTION_CLAMP_MSS;
 475
 476         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 477         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 478         get_config_bool(lookup_config(config_tree, "Broadcast"), &broadcast);
 479
 480 #if !defined(SOL_IP) || !defined(IP_TOS)
 481         if(priorityinheritance)
 482                 logger(LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 483 #endif
 484
 485         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 486                 macexpire = 600;
 487
 488         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 489                 if(maxtimeout <= 0) {
 490                         logger(LOG_ERR, "Bogus maximum timeout!");
 491                         return false;
 492                 }
 493         } else
 494                 maxtimeout = 900;
 495
 496         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 497                 if(udp_rcvbuf <= 0) {
 498                         logger(LOG_ERR, "UDPRcvBuf cannot be negative!");
 499                         return false;
 500                 }
 501         }
 502
 503         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 504                 if(udp_sndbuf <= 0) {
 505                         logger(LOG_ERR, "UDPSndBuf cannot be negative!");
 506                         return false;
 507                 }
 508         }
 509
 510         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 511                 if(replaywin_int < 0) {
 512                         logger(LOG_ERR, "ReplayWindow cannot be negative!");
 513                         return false;
 514                 }
 515                 replaywin = (unsigned)replaywin_int;
 516         }
 517
 518         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 519                 if(!strcasecmp(afname, "IPv4"))
 520                         addressfamily = AF_INET;
 521                 else if(!strcasecmp(afname, "IPv6"))
 522                         addressfamily = AF_INET6;
 523                 else if(!strcasecmp(afname, "any"))
 524                         addressfamily = AF_UNSPEC;
 525                 else {
 526                         logger(LOG_ERR, "Invalid address family!");
 527                         return false;
 528                 }
 529                 free(afname);
 530         }
 531
 532         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 533
 534         /* Generate packet encryption key */
 535
 536         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 537                 cipher = xstrdup("blowfish");
 538
 539         if(!cipher_open_by_name(&myself->incipher, cipher)) {
 540                 logger(LOG_ERR, "Unrecognized cipher type!");
 541                 return false;
 542         }
 543
 544         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 545                 keylifetime = 3600;
 546
 547         regenerate_key();
 548
 549         /* Check if we want to use message authentication codes... */
 550
 551         int maclength = 4;
 552         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 553
 554         if(maclength < 0) {
 555                 logger(LOG_ERR, "Bogus MAC length!");
 556                 return false;
 557         }
 558
 559         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 560                 digest = xstrdup("sha1");
 561
 562         if(!digest_open_by_name(&myself->indigest, digest, maclength)) {
 563                 logger(LOG_ERR, "Unrecognized digest type!");
 564                 return false;
 565         }
 566
 567         /* Compression */
 568
 569         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 570                 if(myself->incompression < 0 || myself->incompression > 11) {
 571                         logger(LOG_ERR, "Bogus compression level!");
 572                         return false;
 573                 }
 574         } else
 575                 myself->incompression = 0;
 576
 577         myself->connection->outcompression = 0;
 578
 579         /* Done */
 580
 581         myself->nexthop = myself;
 582         myself->via = myself;
 583         myself->status.reachable = true;
 584         node_add(myself);
 585
 586         graph();
 587
 588         if(strictsubnets)
 589                 load_all_subnets();
 590
 591         /* Open device */
 592
 593         devops = os_devops;
 594
 595         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 596                 if(!strcasecmp(type, "dummy"))
 597                         devops = dummy_devops;
 598                 else if(!strcasecmp(type, "raw_socket"))
 599                         devops = raw_socket_devops;
 600 #ifdef ENABLE_UML
 601                 else if(!strcasecmp(type, "uml"))
 602                         devops = uml_devops;
 603 #endif
 604 #ifdef ENABLE_VDE
 605                 else if(!strcasecmp(type, "vde"))
 606                         devops = vde_devops;
 607 #endif
 608         }
 609
 610         if(!devops.setup())
 611                 return false;
 612
 613         if(device_fd >= 0) {
 614                 event_set(&device_ev, device_fd, EV_READ|EV_PERSIST, handle_device_data, NULL);
 615
 616                 if (event_add(&device_ev, NULL) < 0) {
 617                         logger(LOG_ERR, "event_add failed: %s", strerror(errno));
 618                         devops.close();
 619                         return false;
 620                 }
 621         }
 622
 623         /* Run tinc-up script to further initialize the tap interface */
 624         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 625         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 626         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 627         xasprintf(&envp[3], "NAME=%s", myself->name);
 628         envp[4] = NULL;
 629
 630         execute_script("tinc-up", envp);
 631
 632         for(i = 0; i < 4; i++)
 633                 free(envp[i]);
 634
 635         /* Run subnet-up scripts for our own subnets */
 636
 637         subnet_update(myself, NULL, true);
 638
 639         /* Open sockets */
 640
 641         listen_sockets = 0;
 642         cfg = lookup_config(config_tree, "BindToAddress");
 643
 644         do {
 645                 get_config_string(cfg, &address);
 646                 if(cfg)
 647                         cfg = lookup_config_next(config_tree, cfg);
 648
 649                 hint.ai_family = addressfamily;
 650                 hint.ai_socktype = SOCK_STREAM;
 651                 hint.ai_protocol = IPPROTO_TCP;
 652                 hint.ai_flags = AI_PASSIVE;
 653
 654                 err = getaddrinfo(address, myport, &hint, &ai);
 655                 free(address);
 656
 657                 if(err || !ai) {
 658                         logger(LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
 659                                    gai_strerror(err));
 660                         return false;
 661                 }
 662
 663                 for(aip = ai; aip; aip = aip->ai_next) {
 664                         if(listen_sockets >= MAXSOCKETS) {
 665                                 logger(LOG_ERR, "Too many listening sockets");
 666                                 return false;
 667                         }
 668
 669                         listen_socket[listen_sockets].tcp =
 670                                 setup_listen_socket((sockaddr_t *) aip->ai_addr);
 671
 672                         if(listen_socket[listen_sockets].tcp < 0)
 673                                 continue;
 674
 675                         listen_socket[listen_sockets].udp =
 676                                 setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 677
 678                         if(listen_socket[listen_sockets].udp < 0) {
 679                                 close(listen_socket[listen_sockets].tcp);
 680                                 continue;
 681                         }
 682
 683                         event_set(&listen_socket[listen_sockets].ev_tcp,
 684                                           listen_socket[listen_sockets].tcp,
 685                                           EV_READ|EV_PERSIST,
 686                                           handle_new_meta_connection, NULL);
 687                         if(event_add(&listen_socket[listen_sockets].ev_tcp, NULL) < 0) {
 688                                 logger(LOG_ERR, "event_add failed: %s", strerror(errno));
 689                                 abort();
 690                         }
 691
 692                         event_set(&listen_socket[listen_sockets].ev_udp,
 693                                           listen_socket[listen_sockets].udp,
 694                                           EV_READ|EV_PERSIST,
 695                                           handle_incoming_vpn_data, (void *)(intptr_t)listen_sockets);
 696                         if(event_add(&listen_socket[listen_sockets].ev_udp, NULL) < 0) {
 697                                 logger(LOG_ERR, "event_add failed: %s", strerror(errno));
 698                                 abort();
 699                         }
 700
 701                         ifdebug(CONNECTIONS) {
 702                                 hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 703                                 logger(LOG_NOTICE, "Listening on %s", hostname);
 704                                 free(hostname);
 705                         }
 706
 707                         memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 708                         listen_sockets++;
 709                 }
 710
 711                 freeaddrinfo(ai);
 712         } while(cfg);
 713
 714         if(listen_sockets)
 715                 logger(LOG_NOTICE, "Ready");
 716         else {
 717                 logger(LOG_ERR, "Unable to create any listening socket!");
 718                 return false;
 719         }
 720
 721         return true;
 722 }
 723
 724 /*
 725   initialize network
 726 */
 727 bool setup_network(void) {
 728         init_connections();
 729         init_subnets();
 730         init_nodes();
 731         init_edges();
 732         init_requests();
 733
 734         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 735                 if(pinginterval < 1) {
 736                         pinginterval = 86400;
 737                 }
 738         } else
 739                 pinginterval = 60;
 740
 741         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 742                 pingtimeout = 5;
 743         if(pingtimeout < 1 || pingtimeout > pinginterval)
 744                 pingtimeout = pinginterval;
 745
 746         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 747                 maxoutbufsize = 10 * MTU;
 748
 749         if(!setup_myself())
 750                 return false;
 751
 752         return true;
 753 }
 754
 755 /*
 756   close all open network connections
 757 */
 758 void close_network_connections(void) {
 759         splay_node_t *node, *next;
 760         connection_t *c;
 761         char *envp[5];
 762         int i;
 763
 764         for(node = connection_tree->head; node; node = next) {
 765                 next = node->next;
 766                 c = node->data;
 767                 c->outgoing = NULL;
 768                 terminate_connection(c, false);
 769         }
 770
 771         list_delete_list(outgoing_list);
 772
 773         if(myself && myself->connection) {
 774                 subnet_update(myself, NULL, false);
 775                 terminate_connection(myself->connection, false);
 776                 free_connection(myself->connection);
 777         }
 778
 779         for(i = 0; i < listen_sockets; i++) {
 780                 event_del(&listen_socket[i].ev_tcp);
 781                 event_del(&listen_socket[i].ev_udp);
 782                 close(listen_socket[i].tcp);
 783                 close(listen_socket[i].udp);
 784         }
 785
 786         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 787         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 788         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 789         xasprintf(&envp[3], "NAME=%s", myself->name);
 790         envp[4] = NULL;
 791
 792         exit_requests();
 793         exit_edges();
 794         exit_subnets();
 795         exit_nodes();
 796         exit_connections();
 797
 798         execute_script("tinc-down", envp);
 799
 800         if(myport) free(myport);
 801
 802         for(i = 0; i < 4; i++)
 803                 free(envp[i]);
 804
 805         devops.close();
 806
 807         return;
 808 }