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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, LOG_ERR, "Parsing ECDSA public key file `%s' failed.", fname);
 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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                 logger(DEBUG_STATUS, 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
 296         xasprintf(&dname, "%s/hosts", confbase);
 297         dir = opendir(dname);
 298         if(!dir) {
 299                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 300                 free(dname);
 301                 return;
 302         }
 303
 304         while((ent = readdir(dir))) {
 305                 if(!check_id(ent->d_name))
 306                         continue;
 307
 308                 n = lookup_node(ent->d_name);
 309                 #ifdef _DIRENT_HAVE_D_TYPE
 310                 //if(ent->d_type != DT_REG)
 311                 //      continue;
 312                 #endif
 313
 314                 xasprintf(&fname, "%s/hosts/%s", confbase, ent->d_name);
 315                 init_configuration(&config_tree);
 316                 read_config_options(config_tree, ent->d_name);
 317                 read_config_file(config_tree, fname);
 318                 free(fname);
 319
 320                 if(!n) {
 321                         n = new_node();
 322                         n->name = xstrdup(ent->d_name);
 323                         node_add(n);
 324                 }
 325
 326                 for(cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 327                         if(!get_config_subnet(cfg, &s))
 328                                 continue;
 329
 330                         if((s2 = lookup_subnet(n, s))) {
 331                                 s2->expires = -1;
 332                         } else {
 333                                 subnet_add(n, s);
 334                         }
 335                 }
 336
 337                 exit_configuration(&config_tree);
 338         }
 339
 340         closedir(dir);
 341 }
 342
 343 /*
 344   Configure node_t myself and set up the local sockets (listen only)
 345 */
 346 static bool setup_myself(void) {
 347         config_t *cfg;
 348         subnet_t *subnet;
 349         char *name, *hostname, *mode, *afname, *cipher, *digest, *type;
 350         char *fname = NULL;
 351         char *address = NULL;
 352         char *envp[5];
 353         struct addrinfo *ai, *aip, hint = {0};
 354         bool choice;
 355         int i, err;
 356         int replaywin_int;
 357
 358         myself = new_node();
 359         myself->connection = new_connection();
 360
 361         myself->hostname = xstrdup("MYSELF");
 362         myself->connection->hostname = xstrdup("MYSELF");
 363
 364         myself->connection->options = 0;
 365         myself->connection->protocol_major = PROT_MAJOR;
 366         myself->connection->protocol_minor = PROT_MINOR;
 367
 368         if(!get_config_string(lookup_config(config_tree, "Name"), &name)) {     /* Not acceptable */
 369                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 370                 return false;
 371         }
 372
 373         if(!check_id(name)) {
 374                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
 375                 free(name);
 376                 return false;
 377         }
 378
 379         myself->name = name;
 380         myself->connection->name = xstrdup(name);
 381         xasprintf(&fname, "%s/hosts/%s", confbase, name);
 382         read_config_options(config_tree, name);
 383         read_config_file(config_tree, fname);
 384         free(fname);
 385
 386         get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental);
 387
 388         if(experimental && !read_ecdsa_private_key())
 389                 return false;
 390
 391         if(!read_rsa_private_key())
 392                 return false;
 393
 394         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 395                 myport = xstrdup("655");
 396
 397         if(!atoi(myport)) {
 398                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 399                 sockaddr_t sa;
 400                 if(!ai || !ai->ai_addr)
 401                         return false;
 402                 free(myport);
 403                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 404                 sockaddr2str(&sa, NULL, &myport);
 405         }
 406
 407         /* Read in all the subnets specified in the host configuration file */
 408
 409         cfg = lookup_config(config_tree, "Subnet");
 410
 411         while(cfg) {
 412                 if(!get_config_subnet(cfg, &subnet))
 413                         return false;
 414
 415                 subnet_add(myself, subnet);
 416
 417                 cfg = lookup_config_next(config_tree, cfg);
 418         }
 419
 420         /* Check some options */
 421
 422         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 423                 myself->options |= OPTION_INDIRECT;
 424
 425         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 426                 myself->options |= OPTION_TCPONLY;
 427
 428         if(myself->options & OPTION_TCPONLY)
 429                 myself->options |= OPTION_INDIRECT;
 430
 431         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 432         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 433         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 434         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 435         strictsubnets |= tunnelserver;
 436
 437         if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
 438                 if(!strcasecmp(mode, "router"))
 439                         routing_mode = RMODE_ROUTER;
 440                 else if(!strcasecmp(mode, "switch"))
 441                         routing_mode = RMODE_SWITCH;
 442                 else if(!strcasecmp(mode, "hub"))
 443                         routing_mode = RMODE_HUB;
 444                 else {
 445                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 446                         return false;
 447                 }
 448                 free(mode);
 449         }
 450
 451         if(get_config_string(lookup_config(config_tree, "Forwarding"), &mode)) {
 452                 if(!strcasecmp(mode, "off"))
 453                         forwarding_mode = FMODE_OFF;
 454                 else if(!strcasecmp(mode, "internal"))
 455                         forwarding_mode = FMODE_INTERNAL;
 456                 else if(!strcasecmp(mode, "kernel"))
 457                         forwarding_mode = FMODE_KERNEL;
 458                 else {
 459                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 460                         return false;
 461                 }
 462                 free(mode);
 463         }
 464
 465         choice = true;
 466         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 467         if(choice)
 468                 myself->options |= OPTION_PMTU_DISCOVERY;
 469
 470         choice = true;
 471         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 472         if(choice)
 473                 myself->options |= OPTION_CLAMP_MSS;
 474
 475         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 476         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 477         get_config_bool(lookup_config(config_tree, "Broadcast"), &broadcast);
 478
 479 #if !defined(SOL_IP) || !defined(IP_TOS)
 480         if(priorityinheritance)
 481                 logger(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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         devops = os_devops;
 593
 594         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 595                 if(!strcasecmp(type, "dummy"))
 596                         devops = dummy_devops;
 597                 else if(!strcasecmp(type, "raw_socket"))
 598                         devops = raw_socket_devops;
 599                 else if(!strcasecmp(type, "multicast"))
 600                         devops = multicast_devops;
 601 #ifdef ENABLE_UML
 602                 else if(!strcasecmp(type, "uml"))
 603                         devops = uml_devops;
 604 #endif
 605 #ifdef ENABLE_VDE
 606                 else if(!strcasecmp(type, "vde"))
 607                         devops = vde_devops;
 608 #endif
 609         }
 610
 611         if(!devops.setup())
 612                 return false;
 613
 614         if(device_fd >= 0) {
 615                 event_set(&device_ev, device_fd, EV_READ|EV_PERSIST, handle_device_data, NULL);
 616
 617                 if (event_add(&device_ev, NULL) < 0) {
 618                         logger(DEBUG_ALWAYS, LOG_ERR, "event_add failed: %s", strerror(errno));
 619                         devops.close();
 620                         return false;
 621                 }
 622         }
 623
 624         /* Run tinc-up script to further initialize the tap interface */
 625         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 626         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 627         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 628         xasprintf(&envp[3], "NAME=%s", myself->name);
 629         envp[4] = NULL;
 630
 631         execute_script("tinc-up", envp);
 632
 633         for(i = 0; i < 4; i++)
 634                 free(envp[i]);
 635
 636         /* Run subnet-up scripts for our own subnets */
 637
 638         subnet_update(myself, NULL, true);
 639
 640         /* Open sockets */
 641
 642         if(!do_detach && getenv("LISTEN_FDS")) {
 643                 sockaddr_t sa;
 644                 socklen_t salen;
 645
 646                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 647 #ifdef HAVE_UNSETENV
 648                 unsetenv("LISTEN_FDS");
 649 #endif
 650
 651                 if(listen_sockets > MAXSOCKETS) {
 652                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 653                         return false;
 654                 }
 655
 656                 for(i = 0; i < listen_sockets; i++) {
 657                         salen = sizeof sa;
 658                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 659                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
 660                                 return false;
 661                         }
 662
 663                         listen_socket[i].tcp = i + 3;
 664
 665 #ifdef FD_CLOEXEC
 666                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 667 #endif
 668
 669                         listen_socket[i].udp = setup_vpn_in_socket(&sa);
 670                         if(listen_socket[i].udp < 0)
 671                                 return false;
 672
 673                         event_set(&listen_socket[i].ev_tcp, listen_socket[i].tcp, EV_READ|EV_PERSIST, handle_new_meta_connection, NULL);
 674                         if(event_add(&listen_socket[i].ev_tcp, NULL) < 0) {
 675                                 logger(DEBUG_ALWAYS, LOG_ERR, "event_add failed: %s", strerror(errno));
 676                                 abort();
 677                         }
 678
 679                         event_set(&listen_socket[i].ev_udp, listen_socket[i].udp, EV_READ|EV_PERSIST, handle_incoming_vpn_data, (void *)(intptr_t)listen_sockets);
 680                         if(event_add(&listen_socket[listen_sockets].ev_udp, NULL) < 0) {
 681                                 logger(DEBUG_ALWAYS, LOG_ERR, "event_add failed: %s", strerror(errno));
 682                                 abort();
 683                         }
 684
 685                         if(debug_level >= DEBUG_CONNECTIONS) {
 686                                 hostname = sockaddr2hostname(&sa);
 687                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 688                                 free(hostname);
 689                         }
 690
 691                         memcpy(&listen_socket[i].sa, &sa, salen);
 692                 }
 693         } else {
 694                 listen_sockets = 0;
 695                 cfg = lookup_config(config_tree, "BindToAddress");
 696
 697                 do {
 698                         get_config_string(cfg, &address);
 699                         if(cfg)
 700                                 cfg = lookup_config_next(config_tree, cfg);
 701
 702                         char *port = myport;
 703
 704                         if(address) {
 705                                 char *space = strchr(address, ' ');
 706                                 if(space) {
 707                                         *space++ = 0;
 708                                         port = space;
 709                                 }
 710
 711                                 if(!strcmp(address, "*"))
 712                                         *address = 0;
 713                         }
 714
 715                         hint.ai_family = addressfamily;
 716                         hint.ai_socktype = SOCK_STREAM;
 717                         hint.ai_protocol = IPPROTO_TCP;
 718                         hint.ai_flags = AI_PASSIVE;
 719
 720                         err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 721                         free(address);
 722
 723                         if(err || !ai) {
 724                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
 725                                            gai_strerror(err));
 726                                 return false;
 727                         }
 728
 729                         for(aip = ai; aip; aip = aip->ai_next) {
 730                                 if(listen_sockets >= MAXSOCKETS) {
 731                                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 732                                         return false;
 733                                 }
 734
 735                                 listen_socket[listen_sockets].tcp =
 736                                         setup_listen_socket((sockaddr_t *) aip->ai_addr);
 737
 738                                 if(listen_socket[listen_sockets].tcp < 0)
 739                                         continue;
 740
 741                                 listen_socket[listen_sockets].udp =
 742                                         setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 743
 744                                 if(listen_socket[listen_sockets].udp < 0) {
 745                                         close(listen_socket[listen_sockets].tcp);
 746                                         continue;
 747                                 }
 748
 749                                 event_set(&listen_socket[listen_sockets].ev_tcp,
 750                                                   listen_socket[listen_sockets].tcp,
 751                                                   EV_READ|EV_PERSIST,
 752                                                   handle_new_meta_connection, NULL);
 753                                 if(event_add(&listen_socket[listen_sockets].ev_tcp, NULL) < 0) {
 754                                         logger(DEBUG_ALWAYS, LOG_ERR, "event_add failed: %s", strerror(errno));
 755                                         abort();
 756                                 }
 757
 758                                 event_set(&listen_socket[listen_sockets].ev_udp,
 759                                                   listen_socket[listen_sockets].udp,
 760                                                   EV_READ|EV_PERSIST,
 761                                                   handle_incoming_vpn_data, (void *)(intptr_t)listen_sockets);
 762                                 if(event_add(&listen_socket[listen_sockets].ev_udp, NULL) < 0) {
 763                                         logger(DEBUG_ALWAYS, LOG_ERR, "event_add failed: %s", strerror(errno));
 764                                         abort();
 765                                 }
 766
 767                                 if(debug_level >= DEBUG_CONNECTIONS) {
 768                                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 769                                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 770                                         free(hostname);
 771                                 }
 772
 773                                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 774                                 listen_sockets++;
 775                         }
 776
 777                         freeaddrinfo(ai);
 778                 } while(cfg);
 779         }
 780
 781         if(listen_sockets)
 782                 logger(DEBUG_ALWAYS, LOG_NOTICE, "Ready");
 783         else {
 784                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
 785                 return false;
 786         }
 787
 788         return true;
 789 }
 790
 791 /*
 792   initialize network
 793 */
 794 bool setup_network(void) {
 795         init_connections();
 796         init_subnets();
 797         init_nodes();
 798         init_edges();
 799         init_requests();
 800
 801         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 802                 if(pinginterval < 1) {
 803                         pinginterval = 86400;
 804                 }
 805         } else
 806                 pinginterval = 60;
 807
 808         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 809                 pingtimeout = 5;
 810         if(pingtimeout < 1 || pingtimeout > pinginterval)
 811                 pingtimeout = pinginterval;
 812
 813         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 814                 maxoutbufsize = 10 * MTU;
 815
 816         if(!setup_myself())
 817                 return false;
 818
 819         return true;
 820 }
 821
 822 /*
 823   close all open network connections
 824 */
 825 void close_network_connections(void) {
 826         splay_node_t *node, *next;
 827         connection_t *c;
 828         char *envp[5];
 829         int i;
 830
 831         for(node = connection_tree->head; node; node = next) {
 832                 next = node->next;
 833                 c = node->data;
 834                 c->outgoing = NULL;
 835                 terminate_connection(c, false);
 836         }
 837
 838         list_delete_list(outgoing_list);
 839
 840         if(myself && myself->connection) {
 841                 subnet_update(myself, NULL, false);
 842                 terminate_connection(myself->connection, false);
 843                 free_connection(myself->connection);
 844         }
 845
 846         for(i = 0; i < listen_sockets; i++) {
 847                 event_del(&listen_socket[i].ev_tcp);
 848                 event_del(&listen_socket[i].ev_udp);
 849                 close(listen_socket[i].tcp);
 850                 close(listen_socket[i].udp);
 851         }
 852
 853         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 854         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 855         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 856         xasprintf(&envp[3], "NAME=%s", myself->name);
 857         envp[4] = NULL;
 858
 859         exit_requests();
 860         exit_edges();
 861         exit_subnets();
 862         exit_nodes();
 863         exit_connections();
 864
 865         execute_script("tinc-down", envp);
 866
 867         if(myport) free(myport);
 868
 869         for(i = 0; i < 4; i++)
 870                 free(envp[i]);
 871
 872         devops.close();
 873
 874         return;
 875 }