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 "process.h"
  36 #include "protocol.h"
  37 #include "route.h"
  38 #include "rsa.h"
  39 #include "utils.h"
  40 #include "xalloc.h"
  41
  42 char *myport;
  43
  44 char *proxyhost;
  45 char *proxyport;
  46 char *proxyuser;
  47 char *proxypass;
  48 proxytype_t proxytype;
  49 int autoconnect;
  50 bool disablebuggypeers;
  51
  52 bool node_read_ecdsa_public_key(node_t *n) {
  53         if(ecdsa_active(n->ecdsa))
  54                 return true;
  55
  56         splay_tree_t *config_tree;
  57         FILE *fp;
  58         char *pubname = NULL;
  59         char *p;
  60
  61         init_configuration(&config_tree);
  62         if(!read_host_config(config_tree, n->name))
  63                 goto exit;
  64
  65         /* First, check for simple ECDSAPublicKey statement */
  66
  67         if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
  68                 n->ecdsa = ecdsa_set_base64_public_key(p);
  69                 free(p);
  70                 goto exit;
  71         }
  72
  73         /* Else, check for ECDSAPublicKeyFile statement and read it */
  74
  75         if(!get_config_string(lookup_config(config_tree, "ECDSAPublicKeyFile"), &pubname))
  76                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  77
  78         fp = fopen(pubname, "r");
  79
  80         if(!fp)
  81                 goto exit;
  82
  83         n->ecdsa = ecdsa_read_pem_public_key(fp);
  84         fclose(fp);
  85
  86 exit:
  87         exit_configuration(&config_tree);
  88         free(pubname);
  89         return n->ecdsa;
  90 }
  91
  92 bool read_ecdsa_public_key(connection_t *c) {
  93         if(ecdsa_active(c->ecdsa))
  94                 return true;
  95
  96         FILE *fp;
  97         char *fname;
  98         char *p;
  99
 100         if(!c->config_tree) {
 101                 init_configuration(&c->config_tree);
 102                 if(!read_host_config(c->config_tree, c->name))
 103                         return false;
 104         }
 105
 106         /* First, check for simple ECDSAPublicKey statement */
 107
 108         if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
 109                 c->ecdsa = ecdsa_set_base64_public_key(p);
 110                 free(p);
 111                 return c->ecdsa;
 112         }
 113
 114         /* Else, check for ECDSAPublicKeyFile statement and read it */
 115
 116         if(!get_config_string(lookup_config(c->config_tree, "ECDSAPublicKeyFile"), &fname))
 117                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 118
 119         fp = fopen(fname, "r");
 120
 121         if(!fp) {
 122                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s",
 123                            fname, strerror(errno));
 124                 free(fname);
 125                 return false;
 126         }
 127
 128         c->ecdsa = ecdsa_read_pem_public_key(fp);
 129         fclose(fp);
 130
 131         if(!c->ecdsa)
 132                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing ECDSA public key file `%s' failed.", fname);
 133         free(fname);
 134         return c->ecdsa;
 135 }
 136
 137 bool read_rsa_public_key(connection_t *c) {
 138         if(ecdsa_active(c->ecdsa))
 139                 return true;
 140
 141         FILE *fp;
 142         char *fname;
 143         char *n;
 144
 145         /* First, check for simple PublicKey statement */
 146
 147         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 148                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 149                 free(n);
 150                 return c->rsa;
 151         }
 152
 153         /* Else, check for PublicKeyFile statement and read it */
 154
 155         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 156                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 157
 158         fp = fopen(fname, "r");
 159
 160         if(!fp) {
 161                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 162                 free(fname);
 163                 return false;
 164         }
 165
 166         c->rsa = rsa_read_pem_public_key(fp);
 167         fclose(fp);
 168
 169         if(!c->rsa)
 170                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 171         free(fname);
 172         return c->rsa;
 173 }
 174
 175 static bool read_ecdsa_private_key(void) {
 176         FILE *fp;
 177         char *fname;
 178
 179         /* Check for PrivateKeyFile statement and read it */
 180
 181         if(!get_config_string(lookup_config(config_tree, "ECDSAPrivateKeyFile"), &fname))
 182                 xasprintf(&fname, "%s" SLASH "ecdsa_key.priv", confbase);
 183
 184         fp = fopen(fname, "r");
 185
 186         if(!fp) {
 187                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA private key file `%s': %s", fname, strerror(errno));
 188                 if(errno == ENOENT)
 189                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an ECDSA keypair with `tinc -n %s generate-ecdsa-keys'.", netname ?: ".");
 190                 free(fname);
 191                 return false;
 192         }
 193
 194 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 195         struct stat s;
 196
 197         if(fstat(fileno(fp), &s)) {
 198                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat ECDSA private key file `%s': %s'", fname, strerror(errno));
 199                 free(fname);
 200                 return false;
 201         }
 202
 203         if(s.st_mode & ~0100700)
 204                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for ECDSA private key file `%s'!", fname);
 205 #endif
 206
 207         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 208         fclose(fp);
 209
 210         if(!myself->connection->ecdsa)
 211                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 212         free(fname);
 213         return myself->connection->ecdsa;
 214 }
 215
 216 static bool read_invitation_key(void) {
 217         FILE *fp;
 218         char *fname;
 219
 220         if(invitation_key) {
 221                 ecdsa_free(invitation_key);
 222                 invitation_key = NULL;
 223         }
 224
 225         xasprintf(&fname, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", confbase);
 226
 227         fp = fopen(fname, "r");
 228
 229         if(fp) {
 230                 invitation_key = ecdsa_read_pem_private_key(fp);
 231                 fclose(fp);
 232                 if(!invitation_key)
 233                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 234         }
 235
 236         free(fname);
 237         return invitation_key;
 238 }
 239
 240 static bool read_rsa_private_key(void) {
 241         FILE *fp;
 242         char *fname;
 243         char *n, *d;
 244
 245         /* First, check for simple PrivateKey statement */
 246
 247         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 248                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 249                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 250                         free(d);
 251                         return false;
 252                 }
 253                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 254                 free(n);
 255                 free(d);
 256                 return myself->connection->rsa;
 257         }
 258
 259         /* Else, check for PrivateKeyFile statement and read it */
 260
 261         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 262                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 263
 264         fp = fopen(fname, "r");
 265
 266         if(!fp) {
 267                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 268                            fname, strerror(errno));
 269                 free(fname);
 270                 return false;
 271         }
 272
 273 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 274         struct stat s;
 275
 276         if(fstat(fileno(fp), &s)) {
 277                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 278                 free(fname);
 279                 return false;
 280         }
 281
 282         if(s.st_mode & ~0100700)
 283                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 284 #endif
 285
 286         myself->connection->rsa = rsa_read_pem_private_key(fp);
 287         fclose(fp);
 288
 289         if(!myself->connection->rsa)
 290                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 291         free(fname);
 292         return myself->connection->rsa;
 293 }
 294
 295 static timeout_t keyexpire_timeout;
 296
 297 static void keyexpire_handler(void *data) {
 298         regenerate_key();
 299         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 300 }
 301
 302 void regenerate_key(void) {
 303         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 304         send_key_changed();
 305 }
 306
 307 void load_all_nodes(void) {
 308         DIR *dir;
 309         struct dirent *ent;
 310         char *dname;
 311
 312         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 313         dir = opendir(dname);
 314         if(!dir) {
 315                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 316                 free(dname);
 317                 return;
 318         }
 319
 320         while((ent = readdir(dir))) {
 321                 if(!check_id(ent->d_name))
 322                         continue;
 323
 324                 node_t *n = lookup_node(ent->d_name);
 325                 if(n)
 326                         continue;
 327
 328                 n = new_node();
 329                 n->name = xstrdup(ent->d_name);
 330                 node_add(n);
 331         }
 332
 333         closedir(dir);
 334 }
 335
 336
 337 char *get_name(void) {
 338         char *name = NULL;
 339
 340         get_config_string(lookup_config(config_tree, "Name"), &name);
 341
 342         if(!name)
 343                 return NULL;
 344
 345         if(*name == '$') {
 346                 char *envname = getenv(name + 1);
 347                 char hostname[32] = "";
 348                 if(!envname) {
 349                         if(strcmp(name + 1, "HOST")) {
 350                                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1);
 351                                 return false;
 352                         }
 353                         if(gethostname(hostname, sizeof hostname) || !*hostname) {
 354                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", strerror(errno));
 355                                 return false;
 356                         }
 357                         hostname[31] = 0;
 358                         envname = hostname;
 359                 }
 360                 free(name);
 361                 name = xstrdup(envname);
 362                 for(char *c = name; *c; c++)
 363                         if(!isalnum(*c))
 364                                 *c = '_';
 365         }
 366
 367         if(!check_id(name)) {
 368                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
 369                 free(name);
 370                 return false;
 371         }
 372
 373         return name;
 374 }
 375
 376 bool setup_myself_reloadable(void) {
 377         char *proxy = NULL;
 378         char *rmode = NULL;
 379         char *fmode = NULL;
 380         char *bmode = NULL;
 381         char *afname = NULL;
 382         char *address = NULL;
 383         char *space;
 384         bool choice;
 385
 386         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 387         if(proxy) {
 388                 if((space = strchr(proxy, ' ')))
 389                         *space++ = 0;
 390
 391                 if(!strcasecmp(proxy, "none")) {
 392                         proxytype = PROXY_NONE;
 393                 } else if(!strcasecmp(proxy, "socks4")) {
 394                         proxytype = PROXY_SOCKS4;
 395                 } else if(!strcasecmp(proxy, "socks4a")) {
 396                         proxytype = PROXY_SOCKS4A;
 397                 } else if(!strcasecmp(proxy, "socks5")) {
 398                         proxytype = PROXY_SOCKS5;
 399                 } else if(!strcasecmp(proxy, "http")) {
 400                         proxytype = PROXY_HTTP;
 401                 } else if(!strcasecmp(proxy, "exec")) {
 402                         proxytype = PROXY_EXEC;
 403                 } else {
 404                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 405                         return false;
 406                 }
 407
 408                 switch(proxytype) {
 409                         case PROXY_NONE:
 410                         default:
 411                                 break;
 412
 413                         case PROXY_EXEC:
 414                                 if(!space || !*space) {
 415                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 416                                         return false;
 417                                 }
 418                                 proxyhost =  xstrdup(space);
 419                                 break;
 420
 421                         case PROXY_SOCKS4:
 422                         case PROXY_SOCKS4A:
 423                         case PROXY_SOCKS5:
 424                         case PROXY_HTTP:
 425                                 proxyhost = space;
 426                                 if(space && (space = strchr(space, ' ')))
 427                                         *space++ = 0, proxyport = space;
 428                                 if(space && (space = strchr(space, ' ')))
 429                                         *space++ = 0, proxyuser = space;
 430                                 if(space && (space = strchr(space, ' ')))
 431                                         *space++ = 0, proxypass = space;
 432                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 433                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 434                                         return false;
 435                                 }
 436                                 proxyhost = xstrdup(proxyhost);
 437                                 proxyport = xstrdup(proxyport);
 438                                 if(proxyuser && *proxyuser)
 439                                         proxyuser = xstrdup(proxyuser);
 440                                 if(proxypass && *proxypass)
 441                                         proxypass = xstrdup(proxypass);
 442                                 break;
 443                 }
 444
 445                 free(proxy);
 446         }
 447
 448         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 449                 myself->options |= OPTION_INDIRECT;
 450
 451         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 452                 myself->options |= OPTION_TCPONLY;
 453
 454         if(myself->options & OPTION_TCPONLY)
 455                 myself->options |= OPTION_INDIRECT;
 456
 457         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 458         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 459
 460         memset(&localdiscovery_address, 0, sizeof localdiscovery_address);
 461         if(get_config_string(lookup_config(config_tree, "LocalDiscoveryAddress"), &address)) {
 462                 struct addrinfo *ai = str2addrinfo(address, myport, SOCK_DGRAM);
 463                 free(address);
 464                 if(!ai)
 465                         return false;
 466                 memcpy(&localdiscovery_address, ai->ai_addr, ai->ai_addrlen);
 467         }
 468
 469
 470         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 471                 if(!strcasecmp(rmode, "router"))
 472                         routing_mode = RMODE_ROUTER;
 473                 else if(!strcasecmp(rmode, "switch"))
 474                         routing_mode = RMODE_SWITCH;
 475                 else if(!strcasecmp(rmode, "hub"))
 476                         routing_mode = RMODE_HUB;
 477                 else {
 478                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 479                         return false;
 480                 }
 481                 free(rmode);
 482         }
 483
 484         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 485                 if(!strcasecmp(fmode, "off"))
 486                         forwarding_mode = FMODE_OFF;
 487                 else if(!strcasecmp(fmode, "internal"))
 488                         forwarding_mode = FMODE_INTERNAL;
 489                 else if(!strcasecmp(fmode, "kernel"))
 490                         forwarding_mode = FMODE_KERNEL;
 491                 else {
 492                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 493                         return false;
 494                 }
 495                 free(fmode);
 496         }
 497
 498         choice = true;
 499         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 500         if(choice)
 501                 myself->options |= OPTION_PMTU_DISCOVERY;
 502
 503         choice = true;
 504         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 505         if(choice)
 506                 myself->options |= OPTION_CLAMP_MSS;
 507
 508         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 509         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 510         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 511                 if(!strcasecmp(bmode, "no"))
 512                         broadcast_mode = BMODE_NONE;
 513                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 514                         broadcast_mode = BMODE_MST;
 515                 else if(!strcasecmp(bmode, "direct"))
 516                         broadcast_mode = BMODE_DIRECT;
 517                 else {
 518                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 519                         return false;
 520                 }
 521                 free(bmode);
 522         }
 523
 524 #if !defined(SOL_IP) || !defined(IP_TOS)
 525         if(priorityinheritance)
 526                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 527 #endif
 528
 529         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 530                 macexpire = 600;
 531
 532         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 533                 if(maxtimeout <= 0) {
 534                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 535                         return false;
 536                 }
 537         } else
 538                 maxtimeout = 900;
 539
 540         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 541                 if(!strcasecmp(afname, "IPv4"))
 542                         addressfamily = AF_INET;
 543                 else if(!strcasecmp(afname, "IPv6"))
 544                         addressfamily = AF_INET6;
 545                 else if(!strcasecmp(afname, "any"))
 546                         addressfamily = AF_UNSPEC;
 547                 else {
 548                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 549                         return false;
 550                 }
 551                 free(afname);
 552         }
 553
 554         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 555
 556         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 557                 keylifetime = 3600;
 558
 559         get_config_int(lookup_config(config_tree, "AutoConnect"), &autoconnect);
 560         if(autoconnect < 0)
 561                 autoconnect = 0;
 562
 563         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 564
 565         read_invitation_key();
 566
 567         return true;
 568 }
 569
 570 /*
 571   Add listening sockets.
 572 */
 573 static bool add_listen_address(char *address, bool bindto) {
 574         char *port = myport;
 575
 576         if(address) {
 577                 char *space = strchr(address, ' ');
 578                 if(space) {
 579                         *space++ = 0;
 580                         port = space;
 581                 }
 582
 583                 if(!strcmp(address, "*"))
 584                         *address = 0;
 585         }
 586
 587         struct addrinfo *ai, hint = {0};
 588         hint.ai_family = addressfamily;
 589         hint.ai_socktype = SOCK_STREAM;
 590         hint.ai_protocol = IPPROTO_TCP;
 591         hint.ai_flags = AI_PASSIVE;
 592
 593         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 594         free(address);
 595
 596         if(err || !ai) {
 597                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 598                 return false;
 599         }
 600
 601         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 602                 // Ignore duplicate addresses
 603                 bool found = false;
 604
 605                 for(int i = 0; i < listen_sockets; i++)
 606                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 607                                 found = true;
 608                                 break;
 609                         }
 610
 611                 if(found)
 612                         continue;
 613
 614                 if(listen_sockets >= MAXSOCKETS) {
 615                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 616                         return false;
 617                 }
 618
 619                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 620
 621                 if(tcp_fd < 0)
 622                         continue;
 623
 624                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 625
 626                 if(tcp_fd < 0) {
 627                         close(tcp_fd);
 628                         continue;
 629                 }
 630
 631                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 632                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 633
 634                 if(debug_level >= DEBUG_CONNECTIONS) {
 635                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 636                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 637                         free(hostname);
 638                 }
 639
 640                 listen_socket[listen_sockets].bindto = bindto;
 641                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 642                 listen_sockets++;
 643         }
 644
 645         freeaddrinfo(ai);
 646         return true;
 647 }
 648
 649 /*
 650   Configure node_t myself and set up the local sockets (listen only)
 651 */
 652 bool setup_myself(void) {
 653         char *name, *hostname, *cipher, *digest, *type;
 654         char *address = NULL;
 655         bool port_specified = false;
 656
 657         if(!(name = get_name())) {
 658                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 659                 return false;
 660         }
 661
 662         myself = new_node();
 663         myself->connection = new_connection();
 664         myself->name = name;
 665         myself->connection->name = xstrdup(name);
 666         read_host_config(config_tree, name);
 667
 668         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 669                 myport = xstrdup("655");
 670         else
 671                 port_specified = true;
 672
 673         myself->connection->options = 0;
 674         myself->connection->protocol_major = PROT_MAJOR;
 675         myself->connection->protocol_minor = PROT_MINOR;
 676
 677         myself->options |= PROT_MINOR << 24;
 678
 679         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 680                 experimental = read_ecdsa_private_key();
 681                 if(!experimental)
 682                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 683         } else {
 684                 if(experimental && !read_ecdsa_private_key())
 685                         return false;
 686         }
 687
 688         if(!read_rsa_private_key())
 689                 return false;
 690
 691         /* Ensure myport is numeric */
 692
 693         if(!atoi(myport)) {
 694                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 695                 sockaddr_t sa;
 696                 if(!ai || !ai->ai_addr)
 697                         return false;
 698                 free(myport);
 699                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 700                 sockaddr2str(&sa, NULL, &myport);
 701         }
 702
 703         /* Check some options */
 704
 705         if(!setup_myself_reloadable())
 706                 return false;
 707
 708         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 709
 710         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 711                 if(max_connection_burst <= 0) {
 712                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 713                         return false;
 714                 }
 715         }
 716
 717         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 718                 if(udp_rcvbuf <= 0) {
 719                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 720                         return false;
 721                 }
 722         }
 723
 724         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 725                 if(udp_sndbuf <= 0) {
 726                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 727                         return false;
 728                 }
 729         }
 730
 731         int replaywin_int;
 732         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 733                 if(replaywin_int < 0) {
 734                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 735                         return false;
 736                 }
 737                 replaywin = (unsigned)replaywin_int;
 738                 sptps_replaywin = replaywin;
 739         }
 740
 741         /* Generate packet encryption key */
 742
 743         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 744                 cipher = xstrdup("blowfish");
 745
 746         if(!strcasecmp(cipher, "none")) {
 747                 myself->incipher = NULL;
 748         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 749                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 750                 return false;
 751         }
 752
 753         free(cipher);
 754
 755         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 756
 757         /* Check if we want to use message authentication codes... */
 758
 759         int maclength = 4;
 760         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 761
 762         if(maclength < 0) {
 763                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 764                 return false;
 765         }
 766
 767         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 768                 digest = xstrdup("sha1");
 769
 770         if(!strcasecmp(digest, "none")) {
 771                 myself->indigest = NULL;
 772         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 773                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 774                 return false;
 775         }
 776
 777         free(digest);
 778
 779         /* Compression */
 780
 781         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 782                 if(myself->incompression < 0 || myself->incompression > 11) {
 783                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 784                         return false;
 785                 }
 786         } else
 787                 myself->incompression = 0;
 788
 789         myself->connection->outcompression = 0;
 790
 791         /* Done */
 792
 793         myself->nexthop = myself;
 794         myself->via = myself;
 795         myself->status.reachable = true;
 796         myself->last_state_change = now.tv_sec;
 797         myself->status.sptps = experimental;
 798         node_add(myself);
 799
 800         graph();
 801
 802         if(autoconnect)
 803                 load_all_nodes();
 804
 805         /* Open sockets */
 806
 807         if(!do_detach && getenv("LISTEN_FDS")) {
 808                 sockaddr_t sa;
 809                 socklen_t salen;
 810
 811                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 812 #ifdef HAVE_UNSETENV
 813                 unsetenv("LISTEN_FDS");
 814 #endif
 815
 816                 if(listen_sockets > MAXSOCKETS) {
 817                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 818                         return false;
 819                 }
 820
 821                 for(int i = 0; i < listen_sockets; i++) {
 822                         salen = sizeof sa;
 823                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 824                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
 825                                 return false;
 826                         }
 827
 828 #ifdef FD_CLOEXEC
 829                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 830 #endif
 831
 832                         int udp_fd = setup_vpn_in_socket(&sa);
 833                         if(udp_fd < 0)
 834                                 return false;
 835
 836                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
 837                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
 838
 839                         if(debug_level >= DEBUG_CONNECTIONS) {
 840                                 hostname = sockaddr2hostname(&sa);
 841                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 842                                 free(hostname);
 843                         }
 844
 845                         memcpy(&listen_socket[i].sa, &sa, salen);
 846                 }
 847         } else {
 848                 listen_sockets = 0;
 849                 int cfgs = 0;
 850
 851                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 852                         cfgs++;
 853                         get_config_string(cfg, &address);
 854                         if(!add_listen_address(address, true))
 855                                 return false;
 856                 }
 857
 858                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 859                         cfgs++;
 860                         get_config_string(cfg, &address);
 861                         if(!add_listen_address(address, false))
 862                                 return false;
 863                 }
 864
 865                 if(!cfgs)
 866                         if(!add_listen_address(address, NULL))
 867                                 return false;
 868         }
 869
 870         if(!listen_sockets) {
 871                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
 872                 return false;
 873         }
 874
 875         /* If no Port option was specified, set myport to the port used by the first listening socket. */
 876
 877         if(!port_specified) {
 878                 sockaddr_t sa;
 879                 socklen_t salen = sizeof sa;
 880                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
 881                         free(myport);
 882                         sockaddr2str(&sa, NULL, &myport);
 883                         if(!myport)
 884                                 myport = xstrdup("655");
 885                 }
 886         }
 887
 888         xasprintf(&myself->hostname, "MYSELF port %s", myport);
 889         myself->connection->hostname = xstrdup(myself->hostname);
 890
 891         /* Done. */
 892
 893         last_config_check = now.tv_sec;
 894
 895         return true;
 896 }
 897
 898 /*
 899   initialize network
 900 */
 901 bool setup_network(void) {
 902         init_connections();
 903         init_nodes();
 904         init_edges();
 905         init_requests();
 906
 907         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 908                 if(pinginterval < 1) {
 909                         pinginterval = 86400;
 910                 }
 911         } else
 912                 pinginterval = 60;
 913
 914         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 915                 pingtimeout = 5;
 916         if(pingtimeout < 1 || pingtimeout > pinginterval)
 917                 pingtimeout = pinginterval;
 918
 919         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 920                 maxoutbufsize = 10 * MTU;
 921
 922         if(!setup_myself())
 923                 return false;
 924
 925         return true;
 926 }
 927
 928 /*
 929   close all open network connections
 930 */
 931 void close_network_connections(void) {
 932         for(list_node_t *node = connection_list->head, *next; node; node = next) {
 933                 next = node->next;
 934                 connection_t *c = node->data;
 935                 c->outgoing = NULL;
 936                 terminate_connection(c, false);
 937         }
 938
 939         if(outgoing_list)
 940                 list_delete_list(outgoing_list);
 941
 942         if(myself && myself->connection) {
 943                 terminate_connection(myself->connection, false);
 944                 free_connection(myself->connection);
 945         }
 946
 947         for(int i = 0; i < listen_sockets; i++) {
 948                 io_del(&listen_socket[i].tcp);
 949                 io_del(&listen_socket[i].udp);
 950                 close(listen_socket[i].tcp.fd);
 951                 close(listen_socket[i].udp.fd);
 952         }
 953
 954         exit_requests();
 955         exit_edges();
 956         exit_nodes();
 957         exit_connections();
 958
 959         if(myport) free(myport);
 960
 961         return;
 962 }