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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2014 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 "cipher.h"
  26 #include "conf.h"
  27 #include "connection.h"
  28 #include "digest.h"
  29 #include "ecdsa.h"
  30 #include "graph.h"
  31 #include "logger.h"
  32 #include "names.h"
  33 #include "net.h"
  34 #include "netutl.h"
  35 #include "protocol.h"
  36 #include "route.h"
  37 #include "rsa.h"
  38 #include "utils.h"
  39 #include "xalloc.h"
  40
  41 char *myport;
  42
  43 char *proxyhost;
  44 char *proxyport;
  45 char *proxyuser;
  46 char *proxypass;
  47 proxytype_t proxytype;
  48 int autoconnect;
  49 bool disablebuggypeers;
  50
  51 bool node_read_ecdsa_public_key(node_t *n) {
  52         if(ecdsa_active(n->ecdsa))
  53                 return true;
  54
  55         splay_tree_t *config_tree;
  56         FILE *fp;
  57         char *pubname = NULL;
  58         char *p;
  59
  60         init_configuration(&config_tree);
  61         if(!read_host_config(config_tree, n->name))
  62                 goto exit;
  63
  64         /* First, check for simple ECDSAPublicKey statement */
  65
  66         if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
  67                 n->ecdsa = ecdsa_set_base64_public_key(p);
  68                 free(p);
  69                 goto exit;
  70         }
  71
  72         /* Else, check for ECDSAPublicKeyFile statement and read it */
  73
  74         if(!get_config_string(lookup_config(config_tree, "ECDSAPublicKeyFile"), &pubname))
  75                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  76
  77         fp = fopen(pubname, "r");
  78
  79         if(!fp)
  80                 goto exit;
  81
  82         n->ecdsa = ecdsa_read_pem_public_key(fp);
  83         fclose(fp);
  84
  85 exit:
  86         exit_configuration(&config_tree);
  87         free(pubname);
  88         return n->ecdsa;
  89 }
  90
  91 bool read_ecdsa_public_key(connection_t *c) {
  92         if(ecdsa_active(c->ecdsa))
  93                 return true;
  94
  95         FILE *fp;
  96         char *fname;
  97         char *p;
  98
  99         if(!c->config_tree) {
 100                 init_configuration(&c->config_tree);
 101                 if(!read_host_config(c->config_tree, c->name))
 102                         return false;
 103         }
 104
 105         /* First, check for simple ECDSAPublicKey statement */
 106
 107         if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
 108                 c->ecdsa = ecdsa_set_base64_public_key(p);
 109                 free(p);
 110                 return c->ecdsa;
 111         }
 112
 113         /* Else, check for ECDSAPublicKeyFile statement and read it */
 114
 115         if(!get_config_string(lookup_config(c->config_tree, "ECDSAPublicKeyFile"), &fname))
 116                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 117
 118         fp = fopen(fname, "r");
 119
 120         if(!fp) {
 121                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s",
 122                            fname, strerror(errno));
 123                 free(fname);
 124                 return false;
 125         }
 126
 127         c->ecdsa = ecdsa_read_pem_public_key(fp);
 128         fclose(fp);
 129
 130         if(!c->ecdsa)
 131                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing ECDSA public key file `%s' failed.", fname);
 132         free(fname);
 133         return c->ecdsa;
 134 }
 135
 136 bool read_rsa_public_key(connection_t *c) {
 137         if(ecdsa_active(c->ecdsa))
 138                 return true;
 139
 140         FILE *fp;
 141         char *fname;
 142         char *n;
 143
 144         /* First, check for simple PublicKey statement */
 145
 146         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 147                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 148                 free(n);
 149                 return c->rsa;
 150         }
 151
 152         /* Else, check for PublicKeyFile statement and read it */
 153
 154         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 155                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 156
 157         fp = fopen(fname, "r");
 158
 159         if(!fp) {
 160                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 161                 free(fname);
 162                 return false;
 163         }
 164
 165         c->rsa = rsa_read_pem_public_key(fp);
 166         fclose(fp);
 167
 168         if(!c->rsa)
 169                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 170         free(fname);
 171         return c->rsa;
 172 }
 173
 174 static bool read_ecdsa_private_key(void) {
 175         FILE *fp;
 176         char *fname;
 177
 178         /* Check for PrivateKeyFile statement and read it */
 179
 180         if(!get_config_string(lookup_config(config_tree, "ECDSAPrivateKeyFile"), &fname))
 181                 xasprintf(&fname, "%s" SLASH "ecdsa_key.priv", confbase);
 182
 183         fp = fopen(fname, "r");
 184
 185         if(!fp) {
 186                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA private key file `%s': %s", fname, strerror(errno));
 187                 if(errno == ENOENT)
 188                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an ECDSA keypair with `tinc -n %s generate-ecdsa-keys'.", netname ?: ".");
 189                 free(fname);
 190                 return false;
 191         }
 192
 193 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 194         struct stat s;
 195
 196         if(fstat(fileno(fp), &s)) {
 197                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat ECDSA private key file `%s': %s'", fname, strerror(errno));
 198                 free(fname);
 199                 return false;
 200         }
 201
 202         if(s.st_mode & ~0100700)
 203                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for ECDSA private key file `%s'!", fname);
 204 #endif
 205
 206         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 207         fclose(fp);
 208
 209         if(!myself->connection->ecdsa)
 210                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 211         free(fname);
 212         return myself->connection->ecdsa;
 213 }
 214
 215 static bool read_invitation_key(void) {
 216         FILE *fp;
 217         char *fname;
 218
 219         if(invitation_key) {
 220                 ecdsa_free(invitation_key);
 221                 invitation_key = NULL;
 222         }
 223
 224         xasprintf(&fname, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", confbase);
 225
 226         fp = fopen(fname, "r");
 227
 228         if(fp) {
 229                 invitation_key = ecdsa_read_pem_private_key(fp);
 230                 fclose(fp);
 231                 if(!invitation_key)
 232                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 233         }
 234
 235         free(fname);
 236         return invitation_key;
 237 }
 238
 239 static bool read_rsa_private_key(void) {
 240         FILE *fp;
 241         char *fname;
 242         char *n, *d;
 243
 244         /* First, check for simple PrivateKey statement */
 245
 246         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 247                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 248                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 249                         free(d);
 250                         return false;
 251                 }
 252                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 253                 free(n);
 254                 free(d);
 255                 return myself->connection->rsa;
 256         }
 257
 258         /* Else, check for PrivateKeyFile statement and read it */
 259
 260         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 261                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 262
 263         fp = fopen(fname, "r");
 264
 265         if(!fp) {
 266                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 267                            fname, strerror(errno));
 268                 free(fname);
 269                 return false;
 270         }
 271
 272 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 273         struct stat s;
 274
 275         if(fstat(fileno(fp), &s)) {
 276                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 277                 free(fname);
 278                 return false;
 279         }
 280
 281         if(s.st_mode & ~0100700)
 282                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 283 #endif
 284
 285         myself->connection->rsa = rsa_read_pem_private_key(fp);
 286         fclose(fp);
 287
 288         if(!myself->connection->rsa)
 289                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 290         free(fname);
 291         return myself->connection->rsa;
 292 }
 293
 294 static timeout_t keyexpire_timeout;
 295
 296 static void keyexpire_handler(void *data) {
 297         regenerate_key();
 298         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 299 }
 300
 301 void regenerate_key(void) {
 302         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 303         send_key_changed();
 304 }
 305
 306 void load_all_nodes(void) {
 307         DIR *dir;
 308         struct dirent *ent;
 309         char *dname;
 310
 311         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 312         dir = opendir(dname);
 313         if(!dir) {
 314                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 315                 free(dname);
 316                 return;
 317         }
 318
 319         while((ent = readdir(dir))) {
 320                 if(!check_id(ent->d_name))
 321                         continue;
 322
 323                 node_t *n = lookup_node(ent->d_name);
 324                 if(n)
 325                         continue;
 326
 327                 n = new_node();
 328                 n->name = xstrdup(ent->d_name);
 329                 node_add(n);
 330         }
 331
 332         closedir(dir);
 333 }
 334
 335
 336 char *get_name(void) {
 337         char *name = NULL;
 338
 339         get_config_string(lookup_config(config_tree, "Name"), &name);
 340
 341         if(!name)
 342                 return NULL;
 343
 344         if(*name == '$') {
 345                 char *envname = getenv(name + 1);
 346                 char hostname[32] = "";
 347                 if(!envname) {
 348                         if(strcmp(name + 1, "HOST")) {
 349                                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1);
 350                                 return false;
 351                         }
 352                         if(gethostname(hostname, sizeof hostname) || !*hostname) {
 353                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", strerror(errno));
 354                                 return false;
 355                         }
 356                         hostname[31] = 0;
 357                         envname = hostname;
 358                 }
 359                 free(name);
 360                 name = xstrdup(envname);
 361                 for(char *c = name; *c; c++)
 362                         if(!isalnum(*c))
 363                                 *c = '_';
 364         }
 365
 366         if(!check_id(name)) {
 367                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
 368                 free(name);
 369                 return false;
 370         }
 371
 372         return name;
 373 }
 374
 375 bool setup_myself_reloadable(void) {
 376         char *proxy = NULL;
 377         char *rmode = NULL;
 378         char *fmode = NULL;
 379         char *bmode = NULL;
 380         char *afname = NULL;
 381         char *address = NULL;
 382         char *space;
 383         bool choice;
 384
 385         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 386         if(proxy) {
 387                 if((space = strchr(proxy, ' ')))
 388                         *space++ = 0;
 389
 390                 if(!strcasecmp(proxy, "none")) {
 391                         proxytype = PROXY_NONE;
 392                 } else if(!strcasecmp(proxy, "socks4")) {
 393                         proxytype = PROXY_SOCKS4;
 394                 } else if(!strcasecmp(proxy, "socks4a")) {
 395                         proxytype = PROXY_SOCKS4A;
 396                 } else if(!strcasecmp(proxy, "socks5")) {
 397                         proxytype = PROXY_SOCKS5;
 398                 } else if(!strcasecmp(proxy, "http")) {
 399                         proxytype = PROXY_HTTP;
 400                 } else if(!strcasecmp(proxy, "exec")) {
 401                         proxytype = PROXY_EXEC;
 402                 } else {
 403                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 404                         return false;
 405                 }
 406
 407                 switch(proxytype) {
 408                         case PROXY_NONE:
 409                         default:
 410                                 break;
 411
 412                         case PROXY_EXEC:
 413                                 if(!space || !*space) {
 414                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 415                                         return false;
 416                                 }
 417                                 proxyhost =  xstrdup(space);
 418                                 break;
 419
 420                         case PROXY_SOCKS4:
 421                         case PROXY_SOCKS4A:
 422                         case PROXY_SOCKS5:
 423                         case PROXY_HTTP:
 424                                 proxyhost = space;
 425                                 if(space && (space = strchr(space, ' ')))
 426                                         *space++ = 0, proxyport = space;
 427                                 if(space && (space = strchr(space, ' ')))
 428                                         *space++ = 0, proxyuser = space;
 429                                 if(space && (space = strchr(space, ' ')))
 430                                         *space++ = 0, proxypass = space;
 431                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 432                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 433                                         return false;
 434                                 }
 435                                 proxyhost = xstrdup(proxyhost);
 436                                 proxyport = xstrdup(proxyport);
 437                                 if(proxyuser && *proxyuser)
 438                                         proxyuser = xstrdup(proxyuser);
 439                                 if(proxypass && *proxypass)
 440                                         proxypass = xstrdup(proxypass);
 441                                 break;
 442                 }
 443
 444                 free(proxy);
 445         }
 446
 447         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 448                 myself->options |= OPTION_INDIRECT;
 449
 450         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 451                 myself->options |= OPTION_TCPONLY;
 452
 453         if(myself->options & OPTION_TCPONLY)
 454                 myself->options |= OPTION_INDIRECT;
 455
 456         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 457         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 458
 459         memset(&localdiscovery_address, 0, sizeof localdiscovery_address);
 460         if(get_config_string(lookup_config(config_tree, "LocalDiscoveryAddress"), &address)) {
 461                 struct addrinfo *ai = str2addrinfo(address, myport, SOCK_DGRAM);
 462                 free(address);
 463                 if(!ai)
 464                         return false;
 465                 memcpy(&localdiscovery_address, ai->ai_addr, ai->ai_addrlen);
 466         }
 467
 468
 469         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 470                 if(!strcasecmp(rmode, "router"))
 471                         routing_mode = RMODE_ROUTER;
 472                 else if(!strcasecmp(rmode, "switch"))
 473                         routing_mode = RMODE_SWITCH;
 474                 else if(!strcasecmp(rmode, "hub"))
 475                         routing_mode = RMODE_HUB;
 476                 else {
 477                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 478                         return false;
 479                 }
 480                 free(rmode);
 481         }
 482
 483         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 484                 if(!strcasecmp(fmode, "off"))
 485                         forwarding_mode = FMODE_OFF;
 486                 else if(!strcasecmp(fmode, "internal"))
 487                         forwarding_mode = FMODE_INTERNAL;
 488                 else if(!strcasecmp(fmode, "kernel"))
 489                         forwarding_mode = FMODE_KERNEL;
 490                 else {
 491                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 492                         return false;
 493                 }
 494                 free(fmode);
 495         }
 496
 497         choice = true;
 498         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 499         if(choice)
 500                 myself->options |= OPTION_PMTU_DISCOVERY;
 501
 502         choice = true;
 503         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 504         if(choice)
 505                 myself->options |= OPTION_CLAMP_MSS;
 506
 507         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 508         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 509         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 510                 if(!strcasecmp(bmode, "no"))
 511                         broadcast_mode = BMODE_NONE;
 512                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 513                         broadcast_mode = BMODE_MST;
 514                 else if(!strcasecmp(bmode, "direct"))
 515                         broadcast_mode = BMODE_DIRECT;
 516                 else {
 517                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 518                         return false;
 519                 }
 520                 free(bmode);
 521         }
 522
 523 #if !defined(SOL_IP) || !defined(IP_TOS)
 524         if(priorityinheritance)
 525                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 526 #endif
 527
 528         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 529                 macexpire = 600;
 530
 531         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 532                 if(maxtimeout <= 0) {
 533                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 534                         return false;
 535                 }
 536         } else
 537                 maxtimeout = 900;
 538
 539         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 540                 if(!strcasecmp(afname, "IPv4"))
 541                         addressfamily = AF_INET;
 542                 else if(!strcasecmp(afname, "IPv6"))
 543                         addressfamily = AF_INET6;
 544                 else if(!strcasecmp(afname, "any"))
 545                         addressfamily = AF_UNSPEC;
 546                 else {
 547                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 548                         return false;
 549                 }
 550                 free(afname);
 551         }
 552
 553         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 554
 555         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 556                 keylifetime = 3600;
 557
 558         get_config_int(lookup_config(config_tree, "AutoConnect"), &autoconnect);
 559         if(autoconnect < 0)
 560                 autoconnect = 0;
 561
 562         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 563
 564         read_invitation_key();
 565
 566         return true;
 567 }
 568
 569 /*
 570   Add listening sockets.
 571 */
 572 static bool add_listen_address(char *address, bool bindto) {
 573         char *port = myport;
 574
 575         if(address) {
 576                 char *space = strchr(address, ' ');
 577                 if(space) {
 578                         *space++ = 0;
 579                         port = space;
 580                 }
 581
 582                 if(!strcmp(address, "*"))
 583                         *address = 0;
 584         }
 585
 586         struct addrinfo *ai, hint = {0};
 587         hint.ai_family = addressfamily;
 588         hint.ai_socktype = SOCK_STREAM;
 589         hint.ai_protocol = IPPROTO_TCP;
 590         hint.ai_flags = AI_PASSIVE;
 591
 592         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 593         free(address);
 594
 595         if(err || !ai) {
 596                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 597                 return false;
 598         }
 599
 600         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 601                 // Ignore duplicate addresses
 602                 bool found = false;
 603
 604                 for(int i = 0; i < listen_sockets; i++)
 605                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 606                                 found = true;
 607                                 break;
 608                         }
 609
 610                 if(found)
 611                         continue;
 612
 613                 if(listen_sockets >= MAXSOCKETS) {
 614                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 615                         return false;
 616                 }
 617
 618                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 619
 620                 if(tcp_fd < 0)
 621                         continue;
 622
 623                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 624
 625                 if(tcp_fd < 0) {
 626                         close(tcp_fd);
 627                         continue;
 628                 }
 629
 630                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 631                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 632
 633                 if(debug_level >= DEBUG_CONNECTIONS) {
 634                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 635                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 636                         free(hostname);
 637                 }
 638
 639                 listen_socket[listen_sockets].bindto = bindto;
 640                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 641                 listen_sockets++;
 642         }
 643
 644         freeaddrinfo(ai);
 645         return true;
 646 }
 647
 648 /*
 649   Configure node_t myself and set up the local sockets (listen only)
 650 */
 651 bool setup_myself(void) {
 652         char *name, *hostname, *cipher, *digest, *type;
 653         char *address = NULL;
 654         bool port_specified = false;
 655
 656         if(!(name = get_name())) {
 657                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 658                 return false;
 659         }
 660
 661         myself = new_node();
 662         myself->connection = new_connection();
 663         myself->name = name;
 664         myself->connection->name = xstrdup(name);
 665         read_host_config(config_tree, name);
 666
 667         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 668                 myport = xstrdup("655");
 669         else
 670                 port_specified = true;
 671
 672         myself->connection->options = 0;
 673         myself->connection->protocol_major = PROT_MAJOR;
 674         myself->connection->protocol_minor = PROT_MINOR;
 675
 676         myself->options |= PROT_MINOR << 24;
 677
 678         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 679                 experimental = read_ecdsa_private_key();
 680                 if(!experimental)
 681                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 682         } else {
 683                 if(experimental && !read_ecdsa_private_key())
 684                         return false;
 685         }
 686
 687         if(!read_rsa_private_key())
 688                 return false;
 689
 690         /* Ensure myport is numeric */
 691
 692         if(!atoi(myport)) {
 693                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 694                 sockaddr_t sa;
 695                 if(!ai || !ai->ai_addr)
 696                         return false;
 697                 free(myport);
 698                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 699                 sockaddr2str(&sa, NULL, &myport);
 700         }
 701
 702         /* Check some options */
 703
 704         if(!setup_myself_reloadable())
 705                 return false;
 706
 707         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 708
 709         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 710                 if(max_connection_burst <= 0) {
 711                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 712                         return false;
 713                 }
 714         }
 715
 716         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 717                 if(udp_rcvbuf <= 0) {
 718                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 719                         return false;
 720                 }
 721         }
 722
 723         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 724                 if(udp_sndbuf <= 0) {
 725                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 726                         return false;
 727                 }
 728         }
 729
 730         int replaywin_int;
 731         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 732                 if(replaywin_int < 0) {
 733                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 734                         return false;
 735                 }
 736                 replaywin = (unsigned)replaywin_int;
 737                 sptps_replaywin = replaywin;
 738         }
 739
 740         /* Generate packet encryption key */
 741
 742         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 743                 cipher = xstrdup("blowfish");
 744
 745         if(!strcasecmp(cipher, "none")) {
 746                 myself->incipher = NULL;
 747         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 748                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 749                 return false;
 750         }
 751
 752         free(cipher);
 753
 754         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 755
 756         /* Check if we want to use message authentication codes... */
 757
 758         int maclength = 4;
 759         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 760
 761         if(maclength < 0) {
 762                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 763                 return false;
 764         }
 765
 766         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 767                 digest = xstrdup("sha1");
 768
 769         if(!strcasecmp(digest, "none")) {
 770                 myself->indigest = NULL;
 771         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 772                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 773                 return false;
 774         }
 775
 776         free(digest);
 777
 778         /* Compression */
 779
 780         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 781                 if(myself->incompression < 0 || myself->incompression > 11) {
 782                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 783                         return false;
 784                 }
 785         } else
 786                 myself->incompression = 0;
 787
 788         myself->connection->outcompression = 0;
 789
 790         /* Done */
 791
 792         myself->nexthop = myself;
 793         myself->via = myself;
 794         myself->status.reachable = true;
 795         myself->last_state_change = now.tv_sec;
 796         myself->status.sptps = experimental;
 797         node_add(myself);
 798
 799         graph();
 800
 801         if(autoconnect)
 802                 load_all_nodes();
 803
 804         /* Open sockets */
 805
 806         listen_sockets = 0;
 807         int cfgs = 0;
 808
 809         for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 810                 cfgs++;
 811                 get_config_string(cfg, &address);
 812                 if(!add_listen_address(address, true))
 813                         return false;
 814         }
 815
 816         for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 817                 cfgs++;
 818                 get_config_string(cfg, &address);
 819                 if(!add_listen_address(address, false))
 820                         return false;
 821         }
 822
 823         if(!cfgs)
 824                 if(!add_listen_address(address, NULL))
 825                         return false;
 826
 827         if(!listen_sockets) {
 828                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
 829                 return false;
 830         }
 831
 832         /* If no Port option was specified, set myport to the port used by the first listening socket. */
 833
 834         if(!port_specified) {
 835                 sockaddr_t sa;
 836                 socklen_t salen = sizeof sa;
 837                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
 838                         free(myport);
 839                         sockaddr2str(&sa, NULL, &myport);
 840                         if(!myport)
 841                                 myport = xstrdup("655");
 842                 }
 843         }
 844
 845         xasprintf(&myself->hostname, "MYSELF port %s", myport);
 846         myself->connection->hostname = xstrdup(myself->hostname);
 847
 848         /* Done. */
 849
 850         last_config_check = now.tv_sec;
 851
 852         return true;
 853 }
 854
 855 /*
 856   initialize network
 857 */
 858 bool setup_network(void) {
 859         init_connections();
 860         init_nodes();
 861         init_edges();
 862         init_requests();
 863
 864         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 865                 if(pinginterval < 1) {
 866                         pinginterval = 86400;
 867                 }
 868         } else
 869                 pinginterval = 60;
 870
 871         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 872                 pingtimeout = 5;
 873         if(pingtimeout < 1 || pingtimeout > pinginterval)
 874                 pingtimeout = pinginterval;
 875
 876         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 877                 maxoutbufsize = 10 * MTU;
 878
 879         if(!setup_myself())
 880                 return false;
 881
 882         return true;
 883 }
 884
 885 /*
 886   close all open network connections
 887 */
 888 void close_network_connections(void) {
 889         for(list_node_t *node = connection_list->head, *next; node; node = next) {
 890                 next = node->next;
 891                 connection_t *c = node->data;
 892                 c->outgoing = NULL;
 893                 terminate_connection(c, false);
 894         }
 895
 896         if(outgoing_list)
 897                 list_delete_list(outgoing_list);
 898
 899         if(myself && myself->connection) {
 900                 terminate_connection(myself->connection, false);
 901                 free_connection(myself->connection);
 902         }
 903
 904         for(int i = 0; i < listen_sockets; i++) {
 905                 io_del(&listen_socket[i].tcp);
 906                 io_del(&listen_socket[i].udp);
 907                 close(listen_socket[i].tcp.fd);
 908                 close(listen_socket[i].udp.fd);
 909         }
 910
 911         exit_requests();
 912         exit_edges();
 913         exit_nodes();
 914         exit_connections();
 915
 916         if(myport) free(myport);
 917
 918         return;
 919 }