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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2010 Guus Sliepen <guus@tinc-vpn.org>
   5                   2006      Scott Lamb <slamb@slamb.org>
   6                   2010      Brandon Black <blblack@gmail.com>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License along
  19     with this program; if not, write to the Free Software Foundation, Inc.,
  20     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21 */
  22
  23 #include "system.h"
  24
  25 #include "splay_tree.h"
  26 #include "cipher.h"
  27 #include "conf.h"
  28 #include "connection.h"
  29 #include "control.h"
  30 #include "device.h"
  31 #include "digest.h"
  32 #include "ecdsa.h"
  33 #include "graph.h"
  34 #include "logger.h"
  35 #include "net.h"
  36 #include "netutl.h"
  37 #include "process.h"
  38 #include "protocol.h"
  39 #include "route.h"
  40 #include "rsa.h"
  41 #include "subnet.h"
  42 #include "utils.h"
  43 #include "xalloc.h"
  44
  45 char *myport;
  46 static struct event device_ev;
  47
  48 bool node_read_ecdsa_public_key(node_t *n) {
  49         if(ecdsa_active(&n->ecdsa))
  50                 return true;
  51
  52         splay_tree_t *config_tree;
  53         FILE *fp;
  54         char *fname;
  55         char *p;
  56         bool result = false;
  57
  58         xasprintf(&fname, "%s/hosts/%s", confbase, n->name);
  59
  60         init_configuration(&config_tree);
  61         if(!read_config_file(config_tree, fname))
  62                 goto exit;
  63
  64         /* First, check for simple ECDSAPublicKey statement */
  65
  66         if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
  67                 result = ecdsa_set_base64_public_key(&n->ecdsa, p);
  68                 free(p);
  69                 goto exit;
  70         }
  71
  72         /* Else, check for ECDSAPublicKeyFile statement and read it */
  73
  74         free(fname);
  75
  76         if(!get_config_string(lookup_config(config_tree, "ECDSAPublicKeyFile"), &fname))
  77                 xasprintf(&fname, "%s/hosts/%s", confbase, n->name);
  78
  79         fp = fopen(fname, "r");
  80
  81         if(!fp) {
  82                 logger(LOG_ERR, "Error reading ECDSA public key file `%s': %s", fname, strerror(errno));
  83                 goto exit;
  84         }
  85
  86         result = ecdsa_read_pem_public_key(&n->ecdsa, fp);
  87         fclose(fp);
  88
  89 exit:
  90         exit_configuration(&config_tree);
  91         free(fname);
  92         return result;
  93 }
  94
  95 bool read_ecdsa_public_key(connection_t *c) {
  96         FILE *fp;
  97         char *fname;
  98         char *p;
  99         bool result;
 100
 101         /* First, check for simple ECDSAPublicKey statement */
 102
 103         if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
 104                 result = ecdsa_set_base64_public_key(&c->ecdsa, p);
 105                 free(p);
 106                 return result;
 107         }
 108
 109         /* Else, check for ECDSAPublicKeyFile statement and read it */
 110
 111         if(!get_config_string(lookup_config(c->config_tree, "ECDSAPublicKeyFile"), &fname))
 112                 xasprintf(&fname, "%s/hosts/%s", confbase, c->name);
 113
 114         fp = fopen(fname, "r");
 115
 116         if(!fp) {
 117                 logger(LOG_ERR, "Error reading ECDSA public key file `%s': %s",
 118                            fname, strerror(errno));
 119                 free(fname);
 120                 return false;
 121         }
 122
 123         result = ecdsa_read_pem_public_key(&c->ecdsa, fp);
 124         fclose(fp);
 125
 126         if(!result)
 127                 logger(LOG_ERR, "Reading ECDSA public key file `%s' failed: %s", fname, strerror(errno));
 128         free(fname);
 129         return result;
 130 }
 131
 132 bool read_rsa_public_key(connection_t *c) {
 133         FILE *fp;
 134         char *fname;
 135         char *n;
 136         bool result;
 137
 138         /* First, check for simple PublicKey statement */
 139
 140         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 141                 result = rsa_set_hex_public_key(&c->rsa, n, "FFFF");
 142                 free(n);
 143                 return result;
 144         }
 145
 146         /* Else, check for PublicKeyFile statement and read it */
 147
 148         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 149                 xasprintf(&fname, "%s/hosts/%s", confbase, c->name);
 150
 151         fp = fopen(fname, "r");
 152
 153         if(!fp) {
 154                 logger(LOG_ERR, "Error reading RSA public key file `%s': %s",
 155                            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",
 183                            fname, strerror(errno));
 184                 free(fname);
 185                 return false;
 186         }
 187
 188 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 189         struct stat s;
 190
 191         if(fstat(fileno(fp), &s)) {
 192                 logger(LOG_ERR, "Could not stat ECDSA private key file `%s': %s'", fname, strerror(errno));
 193                 free(fname);
 194                 return false;
 195         }
 196
 197         if(s.st_mode & ~0100700)
 198                 logger(LOG_WARNING, "Warning: insecure file permissions for ECDSA private key file `%s'!", fname);
 199 #endif
 200
 201         result = ecdsa_read_pem_private_key(&myself->connection->ecdsa, fp);
 202         fclose(fp);
 203
 204         if(!result)
 205                 logger(LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 206         free(fname);
 207         return result;
 208 }
 209
 210 static bool read_rsa_private_key(void) {
 211         FILE *fp;
 212         char *fname;
 213         char *n, *d;
 214         bool result;
 215
 216         /* First, check for simple PrivateKey statement */
 217
 218         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 219                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 220                         logger(LOG_ERR, "PrivateKey used but no PublicKey found!");
 221                         free(d);
 222                         return false;
 223                 }
 224                 result = rsa_set_hex_private_key(&myself->connection->rsa, n, "FFFF", d);
 225                 free(n);
 226                 free(d);
 227                 return true;
 228         }
 229
 230         /* Else, check for PrivateKeyFile statement and read it */
 231
 232         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 233                 xasprintf(&fname, "%s/rsa_key.priv", confbase);
 234
 235         fp = fopen(fname, "r");
 236
 237         if(!fp) {
 238                 logger(LOG_ERR, "Error reading RSA private key file `%s': %s",
 239                            fname, strerror(errno));
 240                 free(fname);
 241                 return false;
 242         }
 243
 244 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 245         struct stat s;
 246
 247         if(fstat(fileno(fp), &s)) {
 248                 logger(LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 249                 free(fname);
 250                 return false;
 251         }
 252
 253         if(s.st_mode & ~0100700)
 254                 logger(LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 255 #endif
 256
 257         result = rsa_read_pem_private_key(&myself->connection->rsa, fp);
 258         fclose(fp);
 259
 260         if(!result)
 261                 logger(LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 262         free(fname);
 263         return result;
 264 }
 265
 266 static struct event keyexpire_event;
 267
 268 static void keyexpire_handler(int fd, short events, void *data) {
 269         regenerate_key();
 270 }
 271
 272 void regenerate_key(void) {
 273         if(timeout_initialized(&keyexpire_event)) {
 274                 ifdebug(STATUS) logger(LOG_INFO, "Expiring symmetric keys");
 275                 event_del(&keyexpire_event);
 276                 send_key_changed();
 277         } else {
 278                 timeout_set(&keyexpire_event, keyexpire_handler, NULL);
 279         }
 280
 281         event_add(&keyexpire_event, &(struct timeval){keylifetime, 0});
 282 }
 283
 284 /*
 285   Read Subnets from all host config files
 286 */
 287 void load_all_subnets(void) {
 288         DIR *dir;
 289         struct dirent *ent;
 290         char *dname;
 291         char *fname;
 292         splay_tree_t *config_tree;
 293         config_t *cfg;
 294         subnet_t *s, *s2;
 295         node_t *n;
 296         bool result;
 297
 298         xasprintf(&dname, "%s/hosts", confbase);
 299         dir = opendir(dname);
 300         if(!dir) {
 301                 logger(LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 302                 free(dname);
 303                 return;
 304         }
 305
 306         while((ent = readdir(dir))) {
 307                 if(!check_id(ent->d_name))
 308                         continue;
 309
 310                 n = lookup_node(ent->d_name);
 311                 #ifdef _DIRENT_HAVE_D_TYPE
 312                 //if(ent->d_type != DT_REG)
 313                 //      continue;
 314                 #endif
 315
 316                 xasprintf(&fname, "%s/hosts/%s", confbase, ent->d_name);
 317                 init_configuration(&config_tree);
 318                 result = read_config_file(config_tree, fname);
 319                 free(fname);
 320                 if(!result)
 321                         continue;
 322
 323                 if(!n) {
 324                         n = new_node();
 325                         n->name = xstrdup(ent->d_name);
 326                         node_add(n);
 327                 }
 328
 329                 for(cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 330                         if(!get_config_subnet(cfg, &s))
 331                                 continue;
 332
 333                         if((s2 = lookup_subnet(n, s))) {
 334                                 s2->expires = -1;
 335                         } else {
 336                                 subnet_add(n, s);
 337                         }
 338                 }
 339
 340                 exit_configuration(&config_tree);
 341         }
 342
 343         closedir(dir);
 344 }
 345
 346 /*
 347   Configure node_t myself and set up the local sockets (listen only)
 348 */
 349 static bool setup_myself(void) {
 350         config_t *cfg;
 351         subnet_t *subnet;
 352         char *name, *hostname, *mode, *afname, *cipher, *digest;
 353         char *fname = NULL;
 354         char *address = NULL;
 355         char *envp[5];
 356         struct addrinfo *ai, *aip, hint = {0};
 357         bool choice;
 358         int i, err;
 359         int replaywin_int;
 360
 361         myself = new_node();
 362         myself->connection = new_connection();
 363
 364         myself->hostname = xstrdup("MYSELF");
 365         myself->connection->hostname = xstrdup("MYSELF");
 366
 367         myself->connection->options = 0;
 368         myself->connection->protocol_major = PROT_MAJOR;
 369         myself->connection->protocol_minor = PROT_MINOR;
 370
 371         if(!get_config_string(lookup_config(config_tree, "Name"), &name)) {     /* Not acceptable */
 372                 logger(LOG_ERR, "Name for tinc daemon required!");
 373                 return false;
 374         }
 375
 376         if(!check_id(name)) {
 377                 logger(LOG_ERR, "Invalid name for myself!");
 378                 free(name);
 379                 return false;
 380         }
 381
 382         myself->name = name;
 383         myself->connection->name = xstrdup(name);
 384         xasprintf(&fname, "%s/hosts/%s", confbase, name);
 385         read_config_options(config_tree, name);
 386         read_config_file(config_tree, fname);
 387         free(fname);
 388
 389         get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental);
 390
 391         if(experimental && !read_ecdsa_private_key())
 392                 return false;
 393
 394         if(!read_rsa_private_key())
 395                 return false;
 396
 397         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 398                 myport = xstrdup("655");
 399
 400         if(!atoi(myport)) {
 401                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 402                 sockaddr_t sa;
 403                 if(!ai || !ai->ai_addr)
 404                         return false;
 405                 free(myport);
 406                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 407                 sockaddr2str(&sa, NULL, &myport);
 408         }
 409
 410         /* Read in all the subnets specified in the host configuration file */
 411
 412         cfg = lookup_config(config_tree, "Subnet");
 413
 414         while(cfg) {
 415                 if(!get_config_subnet(cfg, &subnet))
 416                         return false;
 417
 418                 subnet_add(myself, subnet);
 419
 420                 cfg = lookup_config_next(config_tree, cfg);
 421         }
 422
 423         /* Check some options */
 424
 425         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 426                 myself->options |= OPTION_INDIRECT;
 427
 428         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 429                 myself->options |= OPTION_TCPONLY;
 430
 431         if(myself->options & OPTION_TCPONLY)
 432                 myself->options |= OPTION_INDIRECT;
 433
 434         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 435         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 436         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 437         strictsubnets |= tunnelserver;
 438
 439         if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
 440                 if(!strcasecmp(mode, "router"))
 441                         routing_mode = RMODE_ROUTER;
 442                 else if(!strcasecmp(mode, "switch"))
 443                         routing_mode = RMODE_SWITCH;
 444                 else if(!strcasecmp(mode, "hub"))
 445                         routing_mode = RMODE_HUB;
 446                 else {
 447                         logger(LOG_ERR, "Invalid routing mode!");
 448                         return false;
 449                 }
 450                 free(mode);
 451         }
 452
 453         if(get_config_string(lookup_config(config_tree, "Forwarding"), &mode)) {
 454                 if(!strcasecmp(mode, "off"))
 455                         forwarding_mode = FMODE_OFF;
 456                 else if(!strcasecmp(mode, "internal"))
 457                         forwarding_mode = FMODE_INTERNAL;
 458                 else if(!strcasecmp(mode, "kernel"))
 459                         forwarding_mode = FMODE_KERNEL;
 460                 else {
 461                         logger(LOG_ERR, "Invalid forwarding mode!");
 462                         return false;
 463                 }
 464                 free(mode);
 465         }
 466
 467         choice = true;
 468         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 469         if(choice)
 470                 myself->options |= OPTION_PMTU_DISCOVERY;
 471
 472         choice = true;
 473         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 474         if(choice)
 475                 myself->options |= OPTION_CLAMP_MSS;
 476
 477         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 478
 479 #if !defined(SOL_IP) || !defined(IP_TOS)
 480         if(priorityinheritance)
 481                 logger(LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 482 #endif
 483
 484         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 485                 macexpire = 600;
 486
 487         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 488                 if(maxtimeout <= 0) {
 489                         logger(LOG_ERR, "Bogus maximum timeout!");
 490                         return false;
 491                 }
 492         } else
 493                 maxtimeout = 900;
 494
 495         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 496                 if(udp_rcvbuf <= 0) {
 497                         logger(LOG_ERR, "UDPRcvBuf cannot be negative!");
 498                         return false;
 499                 }
 500         }
 501
 502         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 503                 if(udp_sndbuf <= 0) {
 504                         logger(LOG_ERR, "UDPSndBuf cannot be negative!");
 505                         return false;
 506                 }
 507         }
 508
 509         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 510                 if(replaywin_int < 0) {
 511                         logger(LOG_ERR, "ReplayWindow cannot be negative!");
 512                         return false;
 513                 }
 514                 replaywin = (unsigned)replaywin_int;
 515         }
 516
 517         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 518                 if(!strcasecmp(afname, "IPv4"))
 519                         addressfamily = AF_INET;
 520                 else if(!strcasecmp(afname, "IPv6"))
 521                         addressfamily = AF_INET6;
 522                 else if(!strcasecmp(afname, "any"))
 523                         addressfamily = AF_UNSPEC;
 524                 else {
 525                         logger(LOG_ERR, "Invalid address family!");
 526                         return false;
 527                 }
 528                 free(afname);
 529         }
 530
 531         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 532
 533         /* Generate packet encryption key */
 534
 535         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 536                 cipher = xstrdup("blowfish");
 537
 538         if(!cipher_open_by_name(&myself->incipher, cipher)) {
 539                 logger(LOG_ERR, "Unrecognized cipher type!");
 540                 return false;
 541         }
 542
 543         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 544                 keylifetime = 3600;
 545
 546         regenerate_key();
 547
 548         /* Check if we want to use message authentication codes... */
 549
 550         int maclength = 4;
 551         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 552
 553         if(maclength < 0) {
 554                 logger(LOG_ERR, "Bogus MAC length!");
 555                 return false;
 556         }
 557
 558         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 559                 digest = xstrdup("sha1");
 560
 561         if(!digest_open_by_name(&myself->indigest, digest, maclength)) {
 562                 logger(LOG_ERR, "Unrecognized digest type!");
 563                 return false;
 564         }
 565
 566         /* Compression */
 567
 568         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 569                 if(myself->incompression < 0 || myself->incompression > 11) {
 570                         logger(LOG_ERR, "Bogus compression level!");
 571                         return false;
 572                 }
 573         } else
 574                 myself->incompression = 0;
 575
 576         myself->connection->outcompression = 0;
 577
 578         /* Done */
 579
 580         myself->nexthop = myself;
 581         myself->via = myself;
 582         myself->status.reachable = true;
 583         node_add(myself);
 584
 585         graph();
 586
 587         if(strictsubnets)
 588                 load_all_subnets();
 589
 590         /* Open device */
 591
 592         if(!setup_device())
 593                 return false;
 594
 595         if(device_fd >= 0) {
 596                 event_set(&device_ev, device_fd, EV_READ|EV_PERSIST, handle_device_data, NULL);
 597
 598                 if (event_add(&device_ev, NULL) < 0) {
 599                         logger(LOG_ERR, "event_add failed: %s", strerror(errno));
 600                         close_device();
 601                         return false;
 602                 }
 603         }
 604
 605         /* Run tinc-up script to further initialize the tap interface */
 606         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 607         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 608         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 609         xasprintf(&envp[3], "NAME=%s", myself->name);
 610         envp[4] = NULL;
 611
 612         execute_script("tinc-up", envp);
 613
 614         for(i = 0; i < 4; i++)
 615                 free(envp[i]);
 616
 617         /* Run subnet-up scripts for our own subnets */
 618
 619         subnet_update(myself, NULL, true);
 620
 621         /* Open sockets */
 622
 623         get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
 624
 625         hint.ai_family = addressfamily;
 626         hint.ai_socktype = SOCK_STREAM;
 627         hint.ai_protocol = IPPROTO_TCP;
 628         hint.ai_flags = AI_PASSIVE;
 629
 630         err = getaddrinfo(address, myport, &hint, &ai);
 631
 632         if(err || !ai) {
 633                 logger(LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
 634                            gai_strerror(err));
 635                 return false;
 636         }
 637
 638         listen_sockets = 0;
 639
 640         for(aip = ai; aip; aip = aip->ai_next) {
 641                 listen_socket[listen_sockets].tcp =
 642                         setup_listen_socket((sockaddr_t *) aip->ai_addr);
 643
 644                 if(listen_socket[listen_sockets].tcp < 0)
 645                         continue;
 646
 647                 listen_socket[listen_sockets].udp =
 648                         setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 649
 650                 if(listen_socket[listen_sockets].udp < 0) {
 651                         close(listen_socket[listen_sockets].tcp);
 652                         continue;
 653                 }
 654
 655                 event_set(&listen_socket[listen_sockets].ev_tcp,
 656                                   listen_socket[listen_sockets].tcp,
 657                                   EV_READ|EV_PERSIST,
 658                                   handle_new_meta_connection, NULL);
 659                 if(event_add(&listen_socket[listen_sockets].ev_tcp, NULL) < 0) {
 660                         logger(LOG_ERR, "event_add failed: %s", strerror(errno));
 661                         abort();
 662                 }
 663
 664                 event_set(&listen_socket[listen_sockets].ev_udp,
 665                                   listen_socket[listen_sockets].udp,
 666                                   EV_READ|EV_PERSIST,
 667                                   handle_incoming_vpn_data, NULL);
 668                 if(event_add(&listen_socket[listen_sockets].ev_udp, NULL) < 0) {
 669                         logger(LOG_ERR, "event_add failed: %s", strerror(errno));
 670                         abort();
 671                 }
 672
 673                 ifdebug(CONNECTIONS) {
 674                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 675                         logger(LOG_NOTICE, "Listening on %s", hostname);
 676                         free(hostname);
 677                 }
 678
 679                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 680                 listen_sockets++;
 681
 682                 if(listen_sockets >= MAXSOCKETS) {
 683                         logger(LOG_WARNING, "Maximum of %d listening sockets reached", MAXSOCKETS);
 684                         break;
 685                 }
 686         }
 687
 688         freeaddrinfo(ai);
 689
 690         if(listen_sockets)
 691                 logger(LOG_NOTICE, "Ready");
 692         else {
 693                 logger(LOG_ERR, "Unable to create any listening socket!");
 694                 return false;
 695         }
 696
 697         return true;
 698 }
 699
 700 /*
 701   initialize network
 702 */
 703 bool setup_network(void) {
 704         init_connections();
 705         init_subnets();
 706         init_nodes();
 707         init_edges();
 708         init_requests();
 709
 710         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 711                 if(pinginterval < 1) {
 712                         pinginterval = 86400;
 713                 }
 714         } else
 715                 pinginterval = 60;
 716
 717         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 718                 pingtimeout = 5;
 719         if(pingtimeout < 1 || pingtimeout > pinginterval)
 720                 pingtimeout = pinginterval;
 721
 722         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 723                 maxoutbufsize = 10 * MTU;
 724
 725         if(!setup_myself())
 726                 return false;
 727
 728         return true;
 729 }
 730
 731 /*
 732   close all open network connections
 733 */
 734 void close_network_connections(void) {
 735         splay_node_t *node, *next;
 736         connection_t *c;
 737         char *envp[5];
 738         int i;
 739
 740         for(node = connection_tree->head; node; node = next) {
 741                 next = node->next;
 742                 c = node->data;
 743                 c->outgoing = NULL;
 744                 terminate_connection(c, false);
 745         }
 746
 747         list_delete_list(outgoing_list);
 748
 749         if(myself && myself->connection) {
 750                 subnet_update(myself, NULL, false);
 751                 terminate_connection(myself->connection, false);
 752                 free_connection(myself->connection);
 753         }
 754
 755         for(i = 0; i < listen_sockets; i++) {
 756                 event_del(&listen_socket[i].ev_tcp);
 757                 event_del(&listen_socket[i].ev_udp);
 758                 close(listen_socket[i].tcp);
 759                 close(listen_socket[i].udp);
 760         }
 761
 762         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 763         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 764         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 765         xasprintf(&envp[3], "NAME=%s", myself->name);
 766         envp[4] = NULL;
 767
 768         exit_requests();
 769         exit_edges();
 770         exit_subnets();
 771         exit_nodes();
 772         exit_connections();
 773
 774         execute_script("tinc-down", envp);
 775
 776         if(myport) free(myport);
 777
 778         for(i = 0; i < 4; i++)
 779                 free(envp[i]);
 780
 781         close_device();
 782
 783         return;
 784 }