git.meshlink.io Git - meshlink/blob - src/net_setup.c

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 2014 Guus Sliepen <guus@meshlink.io>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License along
  16     with this program; if not, write to the Free Software Foundation, Inc.,
  17     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "system.h"
  21
  22 #include "cipher.h"
  23 #include "conf.h"
  24 #include "connection.h"
  25 #include "digest.h"
  26 #include "ecdsa.h"
  27 #include "graph.h"
  28 #include "logger.h"
  29 #include "net.h"
  30 #include "netutl.h"
  31 #include "protocol.h"
  32 #include "route.h"
  33 #include "utils.h"
  34 #include "xalloc.h"
  35
  36 char *myport;
  37
  38 char *proxyhost;
  39 char *proxyport;
  40 char *proxyuser;
  41 char *proxypass;
  42 proxytype_t proxytype;
  43 int autoconnect;
  44 bool disablebuggypeers;
  45
  46 bool node_read_ecdsa_public_key(node_t *n) {
  47         if(ecdsa_active(n->ecdsa))
  48                 return true;
  49
  50         splay_tree_t *config_tree;
  51         FILE *fp;
  52         char *pubname = NULL;
  53         char *p;
  54
  55         init_configuration(&config_tree);
  56         if(!read_host_config(config_tree, n->name))
  57                 goto exit;
  58
  59         /* First, check for simple ECDSAPublicKey statement */
  60
  61         if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
  62                 n->ecdsa = ecdsa_set_base64_public_key(p);
  63                 free(p);
  64                 goto exit;
  65         }
  66
  67         /* Else, check for ECDSAPublicKeyFile statement and read it */
  68
  69         if(!get_config_string(lookup_config(config_tree, "ECDSAPublicKeyFile"), &pubname))
  70                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  71
  72         fp = fopen(pubname, "r");
  73
  74         if(!fp)
  75                 goto exit;
  76
  77         n->ecdsa = ecdsa_read_pem_public_key(fp);
  78         fclose(fp);
  79
  80 exit:
  81         exit_configuration(&config_tree);
  82         free(pubname);
  83         return n->ecdsa;
  84 }
  85
  86 bool read_ecdsa_public_key(connection_t *c) {
  87         if(ecdsa_active(c->ecdsa))
  88                 return true;
  89
  90         FILE *fp;
  91         char *fname;
  92         char *p;
  93
  94         if(!c->config_tree) {
  95                 init_configuration(&c->config_tree);
  96                 if(!read_host_config(c->config_tree, c->name))
  97                         return false;
  98         }
  99
 100         /* First, check for simple ECDSAPublicKey statement */
 101
 102         if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
 103                 c->ecdsa = ecdsa_set_base64_public_key(p);
 104                 free(p);
 105                 return c->ecdsa;
 106         }
 107
 108         /* Else, check for ECDSAPublicKeyFile statement and read it */
 109
 110         if(!get_config_string(lookup_config(c->config_tree, "ECDSAPublicKeyFile"), &fname))
 111                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 112
 113         fp = fopen(fname, "r");
 114
 115         if(!fp) {
 116                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s",
 117                            fname, strerror(errno));
 118                 free(fname);
 119                 return false;
 120         }
 121
 122         c->ecdsa = ecdsa_read_pem_public_key(fp);
 123         fclose(fp);
 124
 125         if(!c->ecdsa)
 126                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing ECDSA public key file `%s' failed.", fname);
 127         free(fname);
 128         return c->ecdsa;
 129 }
 130
 131 static bool read_ecdsa_private_key(void) {
 132         FILE *fp;
 133         char *fname;
 134
 135         /* Check for PrivateKeyFile statement and read it */
 136
 137         if(!get_config_string(lookup_config(config_tree, "ECDSAPrivateKeyFile"), &fname))
 138                 xasprintf(&fname, "%s" SLASH "ecdsa_key.priv", confbase);
 139
 140         fp = fopen(fname, "r");
 141
 142         if(!fp) {
 143                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA private key file `%s': %s", fname, strerror(errno));
 144                 if(errno == ENOENT)
 145                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an ECDSA keypair with `tinc generate-ecdsa-keys'.");
 146                 free(fname);
 147                 return false;
 148         }
 149
 150 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 151         struct stat s;
 152
 153         if(fstat(fileno(fp), &s)) {
 154                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat ECDSA private key file `%s': %s'", fname, strerror(errno));
 155                 free(fname);
 156                 return false;
 157         }
 158
 159         if(s.st_mode & ~0100700)
 160                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for ECDSA private key file `%s'!", fname);
 161 #endif
 162
 163         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 164         fclose(fp);
 165
 166         if(!myself->connection->ecdsa)
 167                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 168         free(fname);
 169         return myself->connection->ecdsa;
 170 }
 171
 172 static bool read_invitation_key(void) {
 173         FILE *fp;
 174         char *fname;
 175
 176         if(invitation_key) {
 177                 ecdsa_free(invitation_key);
 178                 invitation_key = NULL;
 179         }
 180
 181         xasprintf(&fname, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", confbase);
 182
 183         fp = fopen(fname, "r");
 184
 185         if(fp) {
 186                 invitation_key = ecdsa_read_pem_private_key(fp);
 187                 fclose(fp);
 188                 if(!invitation_key)
 189                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 190         }
 191
 192         free(fname);
 193         return invitation_key;
 194 }
 195
 196 static timeout_t keyexpire_timeout;
 197
 198 static void keyexpire_handler(void *data) {
 199         regenerate_key();
 200         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 201 }
 202
 203 void regenerate_key(void) {
 204         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 205         send_key_changed();
 206 }
 207
 208 void load_all_nodes(void) {
 209         DIR *dir;
 210         struct dirent *ent;
 211         char *dname;
 212
 213         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 214         dir = opendir(dname);
 215         if(!dir) {
 216                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 217                 free(dname);
 218                 return;
 219         }
 220
 221         while((ent = readdir(dir))) {
 222                 if(!check_id(ent->d_name))
 223                         continue;
 224
 225                 node_t *n = lookup_node(ent->d_name);
 226                 if(n)
 227                         continue;
 228
 229                 n = new_node();
 230                 n->name = xstrdup(ent->d_name);
 231                 node_add(n);
 232         }
 233
 234         closedir(dir);
 235 }
 236
 237
 238 char *get_name(void) {
 239         char *name = NULL;
 240
 241         get_config_string(lookup_config(config_tree, "Name"), &name);
 242
 243         if(!name)
 244                 return NULL;
 245
 246         if(*name == '$') {
 247                 char *envname = getenv(name + 1);
 248                 char hostname[32] = "";
 249                 if(!envname) {
 250                         if(strcmp(name + 1, "HOST")) {
 251                                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1);
 252                                 return false;
 253                         }
 254                         if(gethostname(hostname, sizeof hostname) || !*hostname) {
 255                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", strerror(errno));
 256                                 return false;
 257                         }
 258                         hostname[31] = 0;
 259                         envname = hostname;
 260                 }
 261                 free(name);
 262                 name = xstrdup(envname);
 263                 for(char *c = name; *c; c++)
 264                         if(!isalnum(*c))
 265                                 *c = '_';
 266         }
 267
 268         if(!check_id(name)) {
 269                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
 270                 free(name);
 271                 return false;
 272         }
 273
 274         return name;
 275 }
 276
 277 bool setup_myself_reloadable(void) {
 278         char *proxy = NULL;
 279         char *rmode = NULL;
 280         char *fmode = NULL;
 281         char *bmode = NULL;
 282         char *afname = NULL;
 283         char *address = NULL;
 284         char *space;
 285         bool choice;
 286
 287         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 288         if(proxy) {
 289                 if((space = strchr(proxy, ' ')))
 290                         *space++ = 0;
 291
 292                 if(!strcasecmp(proxy, "none")) {
 293                         proxytype = PROXY_NONE;
 294                 } else if(!strcasecmp(proxy, "socks4")) {
 295                         proxytype = PROXY_SOCKS4;
 296                 } else if(!strcasecmp(proxy, "socks4a")) {
 297                         proxytype = PROXY_SOCKS4A;
 298                 } else if(!strcasecmp(proxy, "socks5")) {
 299                         proxytype = PROXY_SOCKS5;
 300                 } else if(!strcasecmp(proxy, "http")) {
 301                         proxytype = PROXY_HTTP;
 302                 } else if(!strcasecmp(proxy, "exec")) {
 303                         proxytype = PROXY_EXEC;
 304                 } else {
 305                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 306                         return false;
 307                 }
 308
 309                 switch(proxytype) {
 310                         case PROXY_NONE:
 311                         default:
 312                                 break;
 313
 314                         case PROXY_EXEC:
 315                                 if(!space || !*space) {
 316                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 317                                         return false;
 318                                 }
 319                                 proxyhost =  xstrdup(space);
 320                                 break;
 321
 322                         case PROXY_SOCKS4:
 323                         case PROXY_SOCKS4A:
 324                         case PROXY_SOCKS5:
 325                         case PROXY_HTTP:
 326                                 proxyhost = space;
 327                                 if(space && (space = strchr(space, ' ')))
 328                                         *space++ = 0, proxyport = space;
 329                                 if(space && (space = strchr(space, ' ')))
 330                                         *space++ = 0, proxyuser = space;
 331                                 if(space && (space = strchr(space, ' ')))
 332                                         *space++ = 0, proxypass = space;
 333                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 334                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 335                                         return false;
 336                                 }
 337                                 proxyhost = xstrdup(proxyhost);
 338                                 proxyport = xstrdup(proxyport);
 339                                 if(proxyuser && *proxyuser)
 340                                         proxyuser = xstrdup(proxyuser);
 341                                 if(proxypass && *proxypass)
 342                                         proxypass = xstrdup(proxypass);
 343                                 break;
 344                 }
 345
 346                 free(proxy);
 347         }
 348
 349         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 350                 myself->options |= OPTION_INDIRECT;
 351
 352         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 353                 myself->options |= OPTION_TCPONLY;
 354
 355         if(myself->options & OPTION_TCPONLY)
 356                 myself->options |= OPTION_INDIRECT;
 357
 358         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 359         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 360
 361         memset(&localdiscovery_address, 0, sizeof localdiscovery_address);
 362         if(get_config_string(lookup_config(config_tree, "LocalDiscoveryAddress"), &address)) {
 363                 struct addrinfo *ai = str2addrinfo(address, myport, SOCK_DGRAM);
 364                 free(address);
 365                 if(!ai)
 366                         return false;
 367                 memcpy(&localdiscovery_address, ai->ai_addr, ai->ai_addrlen);
 368         }
 369
 370
 371         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 372                 if(!strcasecmp(rmode, "router"))
 373                         routing_mode = RMODE_ROUTER;
 374                 else if(!strcasecmp(rmode, "switch"))
 375                         routing_mode = RMODE_SWITCH;
 376                 else if(!strcasecmp(rmode, "hub"))
 377                         routing_mode = RMODE_HUB;
 378                 else {
 379                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 380                         return false;
 381                 }
 382                 free(rmode);
 383         }
 384
 385         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 386                 if(!strcasecmp(fmode, "off"))
 387                         forwarding_mode = FMODE_OFF;
 388                 else if(!strcasecmp(fmode, "internal"))
 389                         forwarding_mode = FMODE_INTERNAL;
 390                 else if(!strcasecmp(fmode, "kernel"))
 391                         forwarding_mode = FMODE_KERNEL;
 392                 else {
 393                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 394                         return false;
 395                 }
 396                 free(fmode);
 397         }
 398
 399         choice = true;
 400         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 401         if(choice)
 402                 myself->options |= OPTION_PMTU_DISCOVERY;
 403
 404         choice = true;
 405         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 406         if(choice)
 407                 myself->options |= OPTION_CLAMP_MSS;
 408
 409         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 410         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 411         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 412                 if(!strcasecmp(bmode, "no"))
 413                         broadcast_mode = BMODE_NONE;
 414                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 415                         broadcast_mode = BMODE_MST;
 416                 else if(!strcasecmp(bmode, "direct"))
 417                         broadcast_mode = BMODE_DIRECT;
 418                 else {
 419                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 420                         return false;
 421                 }
 422                 free(bmode);
 423         }
 424
 425 #if !defined(SOL_IP) || !defined(IP_TOS)
 426         if(priorityinheritance)
 427                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 428 #endif
 429
 430         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 431                 macexpire = 600;
 432
 433         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 434                 if(maxtimeout <= 0) {
 435                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 436                         return false;
 437                 }
 438         } else
 439                 maxtimeout = 900;
 440
 441         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 442                 if(!strcasecmp(afname, "IPv4"))
 443                         addressfamily = AF_INET;
 444                 else if(!strcasecmp(afname, "IPv6"))
 445                         addressfamily = AF_INET6;
 446                 else if(!strcasecmp(afname, "any"))
 447                         addressfamily = AF_UNSPEC;
 448                 else {
 449                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 450                         return false;
 451                 }
 452                 free(afname);
 453         }
 454
 455         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 456
 457         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 458                 keylifetime = 3600;
 459
 460         get_config_int(lookup_config(config_tree, "AutoConnect"), &autoconnect);
 461         if(autoconnect < 0)
 462                 autoconnect = 0;
 463
 464         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 465
 466         read_invitation_key();
 467
 468         return true;
 469 }
 470
 471 /*
 472   Add listening sockets.
 473 */
 474 static bool add_listen_address(char *address, bool bindto) {
 475         char *port = myport;
 476
 477         if(address) {
 478                 char *space = strchr(address, ' ');
 479                 if(space) {
 480                         *space++ = 0;
 481                         port = space;
 482                 }
 483
 484                 if(!strcmp(address, "*"))
 485                         *address = 0;
 486         }
 487
 488         struct addrinfo *ai, hint = {0};
 489         hint.ai_family = addressfamily;
 490         hint.ai_socktype = SOCK_STREAM;
 491         hint.ai_protocol = IPPROTO_TCP;
 492         hint.ai_flags = AI_PASSIVE;
 493
 494         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 495         free(address);
 496
 497         if(err || !ai) {
 498                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 499                 return false;
 500         }
 501
 502         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 503                 // Ignore duplicate addresses
 504                 bool found = false;
 505
 506                 for(int i = 0; i < listen_sockets; i++)
 507                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 508                                 found = true;
 509                                 break;
 510                         }
 511
 512                 if(found)
 513                         continue;
 514
 515                 if(listen_sockets >= MAXSOCKETS) {
 516                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 517                         return false;
 518                 }
 519
 520                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 521
 522                 if(tcp_fd < 0)
 523                         continue;
 524
 525                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 526
 527                 if(tcp_fd < 0) {
 528                         close(tcp_fd);
 529                         continue;
 530                 }
 531
 532                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 533                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 534
 535                 if(debug_level >= DEBUG_CONNECTIONS) {
 536                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 537                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 538                         free(hostname);
 539                 }
 540
 541                 listen_socket[listen_sockets].bindto = bindto;
 542                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 543                 listen_sockets++;
 544         }
 545
 546         freeaddrinfo(ai);
 547         return true;
 548 }
 549
 550 /*
 551   Configure node_t myself and set up the local sockets (listen only)
 552 */
 553 bool setup_myself(void) {
 554         char *name, *hostname, *cipher, *digest, *type;
 555         char *address = NULL;
 556         bool port_specified = false;
 557
 558         if(!(name = get_name())) {
 559                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 560                 return false;
 561         }
 562
 563         myself = new_node();
 564         myself->connection = new_connection();
 565         myself->name = name;
 566         myself->connection->name = xstrdup(name);
 567         read_host_config(config_tree, name);
 568
 569         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 570                 myport = xstrdup("655");
 571         else
 572                 port_specified = true;
 573
 574         myself->connection->options = 0;
 575         myself->connection->protocol_major = PROT_MAJOR;
 576         myself->connection->protocol_minor = PROT_MINOR;
 577
 578         myself->options |= PROT_MINOR << 24;
 579
 580         if(!read_ecdsa_private_key())
 581                 return false;
 582
 583         /* Ensure myport is numeric */
 584
 585         if(!atoi(myport)) {
 586                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 587                 sockaddr_t sa;
 588                 if(!ai || !ai->ai_addr)
 589                         return false;
 590                 free(myport);
 591                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 592                 sockaddr2str(&sa, NULL, &myport);
 593         }
 594
 595         /* Check some options */
 596
 597         if(!setup_myself_reloadable())
 598                 return false;
 599
 600         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 601                 if(max_connection_burst <= 0) {
 602                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 603                         return false;
 604                 }
 605         }
 606
 607         int replaywin_int;
 608         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 609                 if(replaywin_int < 0) {
 610                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 611                         return false;
 612                 }
 613                 replaywin = (unsigned)replaywin_int;
 614                 sptps_replaywin = replaywin;
 615         }
 616
 617         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 618
 619         /* Compression */
 620
 621         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 622                 if(myself->incompression < 0 || myself->incompression > 11) {
 623                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 624                         return false;
 625                 }
 626         } else
 627                 myself->incompression = 0;
 628
 629         myself->connection->outcompression = 0;
 630
 631         /* Done */
 632
 633         myself->nexthop = myself;
 634         myself->via = myself;
 635         myself->status.reachable = true;
 636         myself->last_state_change = now.tv_sec;
 637         node_add(myself);
 638
 639         graph();
 640
 641         if(autoconnect)
 642                 load_all_nodes();
 643
 644         /* Open sockets */
 645
 646         listen_sockets = 0;
 647         int cfgs = 0;
 648
 649         for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 650                 cfgs++;
 651                 get_config_string(cfg, &address);
 652                 if(!add_listen_address(address, true))
 653                         return false;
 654         }
 655
 656         for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 657                 cfgs++;
 658                 get_config_string(cfg, &address);
 659                 if(!add_listen_address(address, false))
 660                         return false;
 661         }
 662
 663         if(!cfgs)
 664                 if(!add_listen_address(address, NULL))
 665                         return false;
 666
 667         if(!listen_sockets) {
 668                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
 669                 return false;
 670         }
 671
 672         /* If no Port option was specified, set myport to the port used by the first listening socket. */
 673
 674         if(!port_specified) {
 675                 sockaddr_t sa;
 676                 socklen_t salen = sizeof sa;
 677                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
 678                         free(myport);
 679                         sockaddr2str(&sa, NULL, &myport);
 680                         if(!myport)
 681                                 myport = xstrdup("655");
 682                 }
 683         }
 684
 685         xasprintf(&myself->hostname, "MYSELF port %s", myport);
 686         myself->connection->hostname = xstrdup(myself->hostname);
 687
 688         /* Done. */
 689
 690         last_config_check = now.tv_sec;
 691
 692         return true;
 693 }
 694
 695 /*
 696   initialize network
 697 */
 698 bool setup_network(void) {
 699         init_connections();
 700         init_nodes();
 701         init_edges();
 702         init_requests();
 703
 704         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 705                 if(pinginterval < 1) {
 706                         pinginterval = 86400;
 707                 }
 708         } else
 709                 pinginterval = 60;
 710
 711         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 712                 pingtimeout = 5;
 713         if(pingtimeout < 1 || pingtimeout > pinginterval)
 714                 pingtimeout = pinginterval;
 715
 716         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 717                 maxoutbufsize = 10 * MTU;
 718
 719         if(!setup_myself())
 720                 return false;
 721
 722         return true;
 723 }
 724
 725 /*
 726   close all open network connections
 727 */
 728 void close_network_connections(void) {
 729         for(list_node_t *node = connection_list->head, *next; node; node = next) {
 730                 next = node->next;
 731                 connection_t *c = node->data;
 732                 c->outgoing = NULL;
 733                 terminate_connection(c, false);
 734         }
 735
 736         if(outgoing_list)
 737                 list_delete_list(outgoing_list);
 738
 739         if(myself && myself->connection) {
 740                 terminate_connection(myself->connection, false);
 741                 free_connection(myself->connection);
 742         }
 743
 744         for(int i = 0; i < listen_sockets; i++) {
 745                 io_del(&listen_socket[i].tcp);
 746                 io_del(&listen_socket[i].udp);
 747                 close(listen_socket[i].tcp.fd);
 748                 close(listen_socket[i].udp.fd);
 749         }
 750
 751         exit_requests();
 752         exit_edges();
 753         exit_nodes();
 754         exit_connections();
 755
 756         if(myport) free(myport);
 757
 758         return;
 759 }