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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2015 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 <openssl/pem.h>
  26 #include <openssl/rsa.h>
  27 #include <openssl/rand.h>
  28 #include <openssl/err.h>
  29 #include <openssl/evp.h>
  30
  31 #include "avl_tree.h"
  32 #include "conf.h"
  33 #include "connection.h"
  34 #include "device.h"
  35 #include "event.h"
  36 #include "graph.h"
  37 #include "logger.h"
  38 #include "net.h"
  39 #include "netutl.h"
  40 #include "process.h"
  41 #include "protocol.h"
  42 #include "proxy.h"
  43 #include "route.h"
  44 #include "subnet.h"
  45 #include "utils.h"
  46 #include "xalloc.h"
  47
  48 char *myport;
  49 devops_t devops;
  50
  51 bool read_rsa_public_key(connection_t *c) {
  52         FILE *fp;
  53         char *pubname;
  54         char *hcfname;
  55         char *key;
  56
  57         if(!c->rsa_key) {
  58                 c->rsa_key = RSA_new();
  59 //              RSA_blinding_on(c->rsa_key, NULL);
  60         }
  61
  62         /* First, check for simple PublicKey statement */
  63
  64         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) {
  65                 if(BN_hex2bn(&c->rsa_key->n, key) != strlen(key)) {
  66                         logger(LOG_ERR, "Invalid PublicKey for %s!", c->name);
  67                         return false;
  68                 }
  69                 BN_hex2bn(&c->rsa_key->e, "FFFF");
  70                 free(key);
  71                 return true;
  72         }
  73
  74         /* Else, check for PublicKeyFile statement and read it */
  75
  76         if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &pubname)) {
  77                 fp = fopen(pubname, "r");
  78
  79                 if(!fp) {
  80                         logger(LOG_ERR, "Error reading RSA public key file `%s': %s", pubname, strerror(errno));
  81                         free(pubname);
  82                         return false;
  83                 }
  84
  85                 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
  86                 fclose(fp);
  87
  88                 if(c->rsa_key) {
  89                         free(pubname);
  90                         return true;            /* Woohoo. */
  91                 }
  92
  93                 /* If it fails, try PEM_read_RSA_PUBKEY. */
  94                 fp = fopen(pubname, "r");
  95
  96                 if(!fp) {
  97                         logger(LOG_ERR, "Error reading RSA public key file `%s': %s", pubname, strerror(errno));
  98                         free(pubname);
  99                         return false;
 100                 }
 101
 102                 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
 103                 fclose(fp);
 104
 105                 if(c->rsa_key) {
 106 //                              RSA_blinding_on(c->rsa_key, NULL);
 107                         free(pubname);
 108                         return true;
 109                 }
 110
 111                 logger(LOG_ERR, "Reading RSA public key file `%s' failed: %s", pubname, strerror(errno));
 112                 free(pubname);
 113                 return false;
 114         }
 115
 116         /* Else, check if a harnessed public key is in the config file */
 117
 118         xasprintf(&hcfname, "%s/hosts/%s", confbase, c->name);
 119         fp = fopen(hcfname, "r");
 120
 121         if(!fp) {
 122                 logger(LOG_ERR, "Error reading RSA public key file `%s': %s", hcfname, strerror(errno));
 123                 free(hcfname);
 124                 return false;
 125         }
 126
 127         c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
 128         fclose(fp);
 129
 130         if(c->rsa_key) {
 131                 free(hcfname);
 132                 return true;
 133         }
 134
 135         /* Try again with PEM_read_RSA_PUBKEY. */
 136
 137         fp = fopen(hcfname, "r");
 138
 139         if(!fp) {
 140                 logger(LOG_ERR, "Error reading RSA public key file `%s': %s", hcfname, strerror(errno));
 141                 free(hcfname);
 142                 return false;
 143         }
 144
 145         free(hcfname);
 146         c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
 147 //      RSA_blinding_on(c->rsa_key, NULL);
 148         fclose(fp);
 149
 150         if(c->rsa_key)
 151                 return true;
 152
 153         logger(LOG_ERR, "No public key for %s specified!", c->name);
 154
 155         return false;
 156 }
 157
 158 static bool read_rsa_private_key(void) {
 159         FILE *fp;
 160         char *fname, *key, *pubkey;
 161
 162         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
 163                 myself->connection->rsa_key = RSA_new();
 164 //              RSA_blinding_on(myself->connection->rsa_key, NULL);
 165                 if(BN_hex2bn(&myself->connection->rsa_key->d, key) != strlen(key)) {
 166                         logger(LOG_ERR, "Invalid PrivateKey for myself!");
 167                         free(key);
 168                         return false;
 169                 }
 170                 free(key);
 171                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &pubkey)) {
 172                         logger(LOG_ERR, "PrivateKey used but no PublicKey found!");
 173                         return false;
 174                 }
 175                 if(BN_hex2bn(&myself->connection->rsa_key->n, pubkey) != strlen(pubkey)) {
 176                         logger(LOG_ERR, "Invalid PublicKey for myself!");
 177                         free(pubkey);
 178                         return false;
 179                 }
 180                 free(pubkey);
 181                 BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
 182                 return true;
 183         }
 184
 185         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 186                 xasprintf(&fname, "%s/rsa_key.priv", confbase);
 187
 188         fp = fopen(fname, "r");
 189
 190         if(!fp) {
 191                 logger(LOG_ERR, "Error reading RSA private key file `%s': %s",
 192                            fname, strerror(errno));
 193                 free(fname);
 194                 return false;
 195         }
 196
 197 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 198         struct stat s;
 199
 200         if(!fstat(fileno(fp), &s)) {
 201                 if(s.st_mode & ~0100700)
 202                         logger(LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 203         } else {
 204                 logger(LOG_WARNING, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 205         }
 206 #endif
 207
 208         myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
 209         fclose(fp);
 210
 211         if(!myself->connection->rsa_key) {
 212                 logger(LOG_ERR, "Reading RSA private key file `%s' failed: %s",
 213                            fname, strerror(errno));
 214                 free(fname);
 215                 return false;
 216         }
 217
 218         free(fname);
 219         return true;
 220 }
 221
 222 /*
 223   Read Subnets from all host config files
 224 */
 225 void load_all_subnets(void) {
 226         DIR *dir;
 227         struct dirent *ent;
 228         char *dname;
 229         char *fname;
 230         avl_tree_t *config_tree;
 231         config_t *cfg;
 232         subnet_t *s, *s2;
 233         node_t *n;
 234
 235         xasprintf(&dname, "%s/hosts", confbase);
 236         dir = opendir(dname);
 237         if(!dir) {
 238                 logger(LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 239                 free(dname);
 240                 return;
 241         }
 242
 243         while((ent = readdir(dir))) {
 244                 if(!check_id(ent->d_name))
 245                         continue;
 246
 247                 n = lookup_node(ent->d_name);
 248                 #ifdef _DIRENT_HAVE_D_TYPE
 249                 //if(ent->d_type != DT_REG)
 250                 //      continue;
 251                 #endif
 252
 253                 xasprintf(&fname, "%s/hosts/%s", confbase, ent->d_name);
 254                 init_configuration(&config_tree);
 255                 read_config_options(config_tree, ent->d_name);
 256                 read_config_file(config_tree, fname);
 257                 free(fname);
 258
 259                 if(!n) {
 260                         n = new_node();
 261                         n->name = xstrdup(ent->d_name);
 262                         node_add(n);
 263                 }
 264
 265                 for(cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 266                         if(!get_config_subnet(cfg, &s))
 267                                 continue;
 268
 269                         if((s2 = lookup_subnet(n, s))) {
 270                                 s2->expires = -1;
 271                         } else {
 272                                 subnet_add(n, s);
 273                         }
 274                 }
 275
 276                 exit_configuration(&config_tree);
 277         }
 278
 279         closedir(dir);
 280 }
 281
 282 char *get_name(void) {
 283         char *name = NULL;
 284
 285         get_config_string(lookup_config(config_tree, "Name"), &name);
 286
 287         if(!name)
 288                 return NULL;
 289
 290         if(*name == '$') {
 291                 char *envname = getenv(name + 1);
 292                 char hostname[32] = "";
 293                 if(!envname) {
 294                         if(strcmp(name + 1, "HOST")) {
 295                                 fprintf(stderr, "Invalid Name: environment variable %s does not exist\n", name + 1);
 296                                 free(name);
 297                                 return false;
 298                         }
 299                         if(gethostname(hostname, sizeof hostname) || !*hostname) {
 300                                 fprintf(stderr, "Could not get hostname: %s\n", strerror(errno));
 301                                 free(name);
 302                                 return false;
 303                         }
 304                         hostname[31] = 0;
 305                         envname = hostname;
 306                 }
 307                 free(name);
 308                 name = xstrdup(envname);
 309                 for(char *c = name; *c; c++)
 310                         if(!isalnum(*c))
 311                                 *c = '_';
 312         }
 313
 314         if(!check_id(name)) {
 315                 logger(LOG_ERR, "Invalid name for myself!");
 316                 free(name);
 317                 return false;
 318         }
 319
 320         return name;
 321 }
 322
 323 /*
 324   Configure node_t myself and set up the local sockets (listen only)
 325 */
 326 static bool setup_myself(void) {
 327         config_t *cfg;
 328         subnet_t *subnet;
 329         char *name, *hostname, *mode, *afname, *cipher, *digest, *type;
 330         char *fname = NULL;
 331         char *address = NULL;
 332         char *proxy = NULL;
 333         char *space;
 334         char *envp[5] = {NULL};
 335         struct addrinfo *ai, *aip, hint = {0};
 336         bool choice;
 337         int i, err;
 338         int replaywin_int;
 339         bool port_specified = false;
 340
 341         myself = new_node();
 342         myself->connection = new_connection();
 343
 344         myself->hostname = xstrdup("MYSELF");
 345         myself->connection->hostname = xstrdup("MYSELF");
 346
 347         myself->connection->options = 0;
 348         myself->connection->protocol_version = PROT_CURRENT;
 349
 350         if(!(name = get_name())) {
 351                 logger(LOG_ERR, "Name for tinc daemon required!");
 352                 return false;
 353         }
 354
 355         /* Read tinc.conf and our own host config file */
 356
 357         myself->name = name;
 358         myself->connection->name = xstrdup(name);
 359         xasprintf(&fname, "%s/hosts/%s", confbase, name);
 360         read_config_options(config_tree, name);
 361         read_config_file(config_tree, fname);
 362         free(fname);
 363
 364         if(!read_rsa_private_key())
 365                 return false;
 366
 367         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 368                 myport = xstrdup("655");
 369         else
 370                 port_specified = true;
 371
 372         /* Ensure myport is numeric */
 373
 374         if(!atoi(myport)) {
 375                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 376                 sockaddr_t sa;
 377                 if(!ai || !ai->ai_addr)
 378                         return false;
 379                 free(myport);
 380                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 381                 sockaddr2str(&sa, NULL, &myport);
 382         }
 383
 384         if(get_config_string(lookup_config(config_tree, "Proxy"), &proxy)) {
 385                 if((space = strchr(proxy, ' ')))
 386                         *space++ = 0;
 387
 388                 if(!strcasecmp(proxy, "none")) {
 389                         proxytype = PROXY_NONE;
 390                 } else if(!strcasecmp(proxy, "socks4")) {
 391                         proxytype = PROXY_SOCKS4;
 392                 } else if(!strcasecmp(proxy, "socks4a")) {
 393                         proxytype = PROXY_SOCKS4A;
 394                 } else if(!strcasecmp(proxy, "socks5")) {
 395                         proxytype = PROXY_SOCKS5;
 396                 } else if(!strcasecmp(proxy, "http")) {
 397                         proxytype = PROXY_HTTP;
 398                 } else if(!strcasecmp(proxy, "exec")) {
 399                         proxytype = PROXY_EXEC;
 400                 } else {
 401                         logger(LOG_ERR, "Unknown proxy type %s!", proxy);
 402                         free(proxy);
 403                         return false;
 404                 }
 405
 406                 switch(proxytype) {
 407                         case PROXY_NONE:
 408                         default:
 409                                 break;
 410
 411                         case PROXY_EXEC:
 412                                 if(!space || !*space) {
 413                                         logger(LOG_ERR, "Argument expected for proxy type exec!");
 414                                         free(proxy);
 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(LOG_ERR, "Host and port argument expected for proxy!");
 433                                         free(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         /* Read in all the subnets specified in the host configuration file */
 449
 450         cfg = lookup_config(config_tree, "Subnet");
 451
 452         while(cfg) {
 453                 if(!get_config_subnet(cfg, &subnet))
 454                         return false;
 455
 456                 subnet_add(myself, subnet);
 457
 458                 cfg = lookup_config_next(config_tree, cfg);
 459         }
 460
 461         /* Check some options */
 462
 463         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 464                 myself->options |= OPTION_INDIRECT;
 465
 466         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 467                 myself->options |= OPTION_TCPONLY;
 468
 469         if(myself->options & OPTION_TCPONLY)
 470                 myself->options |= OPTION_INDIRECT;
 471
 472         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 473         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 474         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 475         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 476         strictsubnets |= tunnelserver;
 477
 478         if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
 479                 if(!strcasecmp(mode, "router"))
 480                         routing_mode = RMODE_ROUTER;
 481                 else if(!strcasecmp(mode, "switch"))
 482                         routing_mode = RMODE_SWITCH;
 483                 else if(!strcasecmp(mode, "hub"))
 484                         routing_mode = RMODE_HUB;
 485                 else {
 486                         logger(LOG_ERR, "Invalid routing mode!");
 487                         free(mode);
 488                         return false;
 489                 }
 490                 free(mode);
 491         }
 492
 493         if(get_config_string(lookup_config(config_tree, "Forwarding"), &mode)) {
 494                 if(!strcasecmp(mode, "off"))
 495                         forwarding_mode = FMODE_OFF;
 496                 else if(!strcasecmp(mode, "internal"))
 497                         forwarding_mode = FMODE_INTERNAL;
 498                 else if(!strcasecmp(mode, "kernel"))
 499                         forwarding_mode = FMODE_KERNEL;
 500                 else {
 501                         logger(LOG_ERR, "Invalid forwarding mode!");
 502                         free(mode);
 503                         return false;
 504                 }
 505                 free(mode);
 506         }
 507
 508         choice = true;
 509         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 510         if(choice)
 511                 myself->options |= OPTION_PMTU_DISCOVERY;
 512
 513         choice = true;
 514         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 515         if(choice)
 516                 myself->options |= OPTION_CLAMP_MSS;
 517
 518         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 519         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 520         if(get_config_string(lookup_config(config_tree, "Broadcast"), &mode)) {
 521                 if(!strcasecmp(mode, "no"))
 522                         broadcast_mode = BMODE_NONE;
 523                 else if(!strcasecmp(mode, "yes") || !strcasecmp(mode, "mst"))
 524                         broadcast_mode = BMODE_MST;
 525                 else if(!strcasecmp(mode, "direct"))
 526                         broadcast_mode = BMODE_DIRECT;
 527                 else {
 528                         logger(LOG_ERR, "Invalid broadcast mode!");
 529                         free(mode);
 530                         return false;
 531                 }
 532                 free(mode);
 533         }
 534
 535 #if !defined(SOL_IP) || !defined(IP_TOS)
 536         if(priorityinheritance)
 537                 logger(LOG_WARNING, "%s not supported on this platform for IPv4 connection", "PriorityInheritance");
 538 #endif
 539
 540 #if !defined(IPPROTO_IPV6) || !defined(IPV6_TCLASS)
 541         if(priorityinheritance)
 542                 logger(LOG_WARNING, "%s not supported on this platform for IPv6 connection", "PriorityInheritance");
 543 #endif
 544
 545         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 546                 macexpire = 600;
 547
 548         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 549                 if(maxtimeout <= 0) {
 550                         logger(LOG_ERR, "Bogus maximum timeout!");
 551                         return false;
 552                 }
 553         } else
 554                 maxtimeout = 900;
 555
 556         if(get_config_int(lookup_config(config_tree, "MinTimeout"), &mintimeout)) {
 557                         if(mintimeout < 0) {
 558                                 logger(LOG_ERR, "Bogus minimum timeout!");
 559                                 return false;
 560                         }
 561                         if(mintimeout > maxtimeout) {
 562                                 logger(LOG_WARNING, "Minimum timeout (%d s) cannot be larger than maximum timeout (%d s). Correcting !", mintimeout, maxtimeout );
 563                                 mintimeout=maxtimeout;
 564                         }
 565                 } else
 566                         mintimeout = 0;
 567
 568         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 569                 if(udp_rcvbuf <= 0) {
 570                         logger(LOG_ERR, "UDPRcvBuf cannot be negative!");
 571                         return false;
 572                 }
 573         }
 574
 575         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 576                 if(udp_sndbuf <= 0) {
 577                         logger(LOG_ERR, "UDPSndBuf cannot be negative!");
 578                         return false;
 579                 }
 580         }
 581
 582         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 583                 if(replaywin_int < 0) {
 584                         logger(LOG_ERR, "ReplayWindow cannot be negative!");
 585                         return false;
 586                 }
 587                 replaywin = (unsigned)replaywin_int;
 588         }
 589
 590         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 591                 if(!strcasecmp(afname, "IPv4"))
 592                         addressfamily = AF_INET;
 593                 else if(!strcasecmp(afname, "IPv6"))
 594                         addressfamily = AF_INET6;
 595                 else if(!strcasecmp(afname, "any"))
 596                         addressfamily = AF_UNSPEC;
 597                 else {
 598                         logger(LOG_ERR, "Invalid address family!");
 599                         free(afname);
 600                         return false;
 601                 }
 602                 free(afname);
 603         }
 604
 605         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 606
 607         /* Generate packet encryption key */
 608
 609         if(get_config_string(lookup_config(config_tree, "Cipher"), &cipher)) {
 610                 if(!strcasecmp(cipher, "none")) {
 611                         myself->incipher = NULL;
 612                 } else {
 613                         myself->incipher = EVP_get_cipherbyname(cipher);
 614
 615                         if(!myself->incipher) {
 616                                 logger(LOG_ERR, "Unrecognized cipher type!");
 617                                 free(cipher);
 618                                 return false;
 619                         }
 620                 }
 621                 free(cipher);
 622         } else
 623                 myself->incipher = EVP_bf_cbc();
 624
 625         if(myself->incipher)
 626                 myself->inkeylength = myself->incipher->key_len + myself->incipher->iv_len;
 627         else
 628                 myself->inkeylength = 1;
 629
 630         myself->connection->outcipher = EVP_bf_ofb();
 631
 632         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 633                 keylifetime = 3600;
 634
 635         keyexpires = now + keylifetime;
 636
 637         /* Check if we want to use message authentication codes... */
 638
 639         if(get_config_string(lookup_config(config_tree, "Digest"), &digest)) {
 640                 if(!strcasecmp(digest, "none")) {
 641                         myself->indigest = NULL;
 642                 } else {
 643                         myself->indigest = EVP_get_digestbyname(digest);
 644
 645                         if(!myself->indigest) {
 646                                 logger(LOG_ERR, "Unrecognized digest type!");
 647                                 free(digest);
 648                                 return false;
 649                         }
 650                 }
 651
 652                 free(digest);
 653         } else
 654                 myself->indigest = EVP_sha1();
 655
 656         myself->connection->outdigest = EVP_sha1();
 657
 658         if(get_config_int(lookup_config(config_tree, "MACLength"), &myself->inmaclength)) {
 659                 if(myself->indigest) {
 660                         if(myself->inmaclength > myself->indigest->md_size) {
 661                                 logger(LOG_ERR, "MAC length exceeds size of digest!");
 662                                 return false;
 663                         } else if(myself->inmaclength < 0) {
 664                                 logger(LOG_ERR, "Bogus MAC length!");
 665                                 return false;
 666                         }
 667                 }
 668         } else
 669                 myself->inmaclength = 4;
 670
 671         myself->connection->outmaclength = 0;
 672
 673         /* Compression */
 674
 675         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 676                 if(myself->incompression < 0 || myself->incompression > 11) {
 677                         logger(LOG_ERR, "Bogus compression level!");
 678                         return false;
 679                 }
 680         } else
 681                 myself->incompression = 0;
 682
 683         myself->connection->outcompression = 0;
 684
 685         /* Done */
 686
 687         myself->nexthop = myself;
 688         myself->via = myself;
 689         myself->status.reachable = true;
 690         node_add(myself);
 691
 692         graph();
 693
 694         if(strictsubnets)
 695                 load_all_subnets();
 696
 697         /* Open device */
 698
 699         devops = os_devops;
 700
 701         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 702                 if(!strcasecmp(type, "dummy"))
 703                         devops = dummy_devops;
 704                 else if(!strcasecmp(type, "raw_socket"))
 705                         devops = raw_socket_devops;
 706                 else if(!strcasecmp(type, "multicast"))
 707                         devops = multicast_devops;
 708 #ifdef ENABLE_UML
 709                 else if(!strcasecmp(type, "uml"))
 710                         devops = uml_devops;
 711 #endif
 712 #ifdef ENABLE_VDE
 713                 else if(!strcasecmp(type, "vde"))
 714                         devops = vde_devops;
 715 #endif
 716                 free(type);
 717         }
 718
 719         if(!devops.setup())
 720                 return false;
 721
 722         /* Run tinc-up script to further initialize the tap interface */
 723         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 724         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 725         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 726         xasprintf(&envp[3], "NAME=%s", myself->name);
 727
 728 #ifdef HAVE_MINGW
 729         Sleep(1000);
 730 #endif
 731 #ifdef HAVE_CYGWIN
 732         sleep(1);
 733 #endif
 734         execute_script("tinc-up", envp);
 735
 736         for(i = 0; i < 4; i++)
 737                 free(envp[i]);
 738
 739         /* Run subnet-up scripts for our own subnets */
 740
 741         subnet_update(myself, NULL, true);
 742
 743         /* Open sockets */
 744
 745         if(!do_detach && getenv("LISTEN_FDS")) {
 746                 sockaddr_t sa;
 747                 socklen_t salen;
 748
 749                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 750 #ifdef HAVE_UNSETENV
 751                 unsetenv("LISTEN_FDS");
 752 #endif
 753
 754                 if(listen_sockets > MAXSOCKETS) {
 755                         logger(LOG_ERR, "Too many listening sockets");
 756                         return false;
 757                 }
 758
 759                 for(i = 0; i < listen_sockets; i++) {
 760                         salen = sizeof sa;
 761                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 762                                 logger(LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
 763                                 return false;
 764                         }
 765
 766                         listen_socket[i].tcp = i + 3;
 767
 768 #ifdef FD_CLOEXEC
 769                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 770 #endif
 771
 772                         listen_socket[i].udp = setup_vpn_in_socket(&sa);
 773                         if(listen_socket[i].udp < 0)
 774                                 return false;
 775
 776                         ifdebug(CONNECTIONS) {
 777                                 hostname = sockaddr2hostname(&sa);
 778                                 logger(LOG_NOTICE, "Listening on %s", hostname);
 779                                 free(hostname);
 780                         }
 781
 782                         memcpy(&listen_socket[i].sa, &sa, salen);
 783                 }
 784         } else {
 785                 listen_sockets = 0;
 786                 cfg = lookup_config(config_tree, "BindToAddress");
 787
 788                 do {
 789                         get_config_string(cfg, &address);
 790                         if(cfg)
 791                                 cfg = lookup_config_next(config_tree, cfg);
 792
 793                         char *port = myport;
 794
 795                         if(address) {
 796                                 char *space = strchr(address, ' ');
 797                                 if(space) {
 798                                         *space++ = 0;
 799                                         port = space;
 800                                 }
 801
 802                                 if(!strcmp(address, "*"))
 803                                         *address = 0;
 804                         }
 805
 806                         hint.ai_family = addressfamily;
 807                         hint.ai_socktype = SOCK_STREAM;
 808                         hint.ai_protocol = IPPROTO_TCP;
 809                         hint.ai_flags = AI_PASSIVE;
 810
 811 #if HAVE_DECL_RES_INIT
 812                         // ensure glibc reloads /etc/resolv.conf.
 813                         res_init();
 814 #endif
 815                         err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 816                         free(address);
 817
 818                         if(err || !ai) {
 819                                 logger(LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
 820                                            gai_strerror(err));
 821                                 return false;
 822                         }
 823
 824                         for(aip = ai; aip; aip = aip->ai_next) {
 825                                 if(listen_sockets >= MAXSOCKETS) {
 826                                         logger(LOG_ERR, "Too many listening sockets");
 827                                         return false;
 828                                 }
 829
 830                                 listen_socket[listen_sockets].tcp =
 831                                         setup_listen_socket((sockaddr_t *) aip->ai_addr);
 832
 833                                 if(listen_socket[listen_sockets].tcp < 0)
 834                                         continue;
 835
 836                                 listen_socket[listen_sockets].udp =
 837                                         setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 838
 839                                 if(listen_socket[listen_sockets].udp < 0)
 840                                         continue;
 841
 842                                 ifdebug(CONNECTIONS) {
 843                                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 844                                         logger(LOG_NOTICE, "Listening on %s", hostname);
 845                                         free(hostname);
 846                                 }
 847
 848                                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 849                                 listen_sockets++;
 850                         }
 851
 852                         freeaddrinfo(ai);
 853                 } while(cfg);
 854         }
 855
 856         if(!listen_sockets) {
 857                 logger(LOG_ERR, "Unable to create any listening socket!");
 858                 return false;
 859         }
 860
 861         /* If no Port option was specified, set myport to the port used by the first listening socket. */
 862
 863         if(!port_specified) {
 864                 sockaddr_t sa;
 865                 socklen_t salen = sizeof sa;
 866                 if(!getsockname(listen_socket[0].udp, &sa.sa, &salen)) {
 867                         free(myport);
 868                         sockaddr2str(&sa, NULL, &myport);
 869                         if(!myport)
 870                                 myport = xstrdup("655");
 871                 }
 872         }
 873
 874         /* Done. */
 875
 876         logger(LOG_NOTICE, "Ready");
 877         return true;
 878 }
 879
 880 /*
 881   initialize network
 882 */
 883 bool setup_network(void) {
 884         now = time(NULL);
 885
 886         init_events();
 887         init_connections();
 888         init_subnets();
 889         init_nodes();
 890         init_edges();
 891         init_requests();
 892
 893         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 894                 if(pinginterval < 1) {
 895                         pinginterval = 86400;
 896                 }
 897         } else
 898                 pinginterval = 60;
 899
 900         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 901                 pingtimeout = 5;
 902         if(pingtimeout < 1 || pingtimeout > pinginterval)
 903                 pingtimeout = pinginterval;
 904
 905         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 906                 maxoutbufsize = 10 * MTU;
 907
 908         if(!setup_myself())
 909                 return false;
 910
 911         return true;
 912 }
 913
 914 /*
 915   close all open network connections
 916 */
 917 void close_network_connections(void) {
 918         avl_node_t *node, *next;
 919         connection_t *c;
 920         char *envp[5] = {NULL};
 921         int i;
 922
 923         for(node = connection_tree->head; node; node = next) {
 924                 next = node->next;
 925                 c = node->data;
 926                 c->outgoing = NULL;
 927                 terminate_connection(c, false);
 928         }
 929
 930         for(list_node_t *node = outgoing_list->head; node; node = node->next) {
 931                 outgoing_t *outgoing = node->data;
 932
 933                 if(outgoing->event)
 934                         event_del(outgoing->event);
 935         }
 936
 937         list_delete_list(outgoing_list);
 938
 939         if(myself && myself->connection) {
 940                 subnet_update(myself, NULL, false);
 941                 terminate_connection(myself->connection, false);
 942                 free_connection(myself->connection);
 943         }
 944
 945         for(i = 0; i < listen_sockets; i++) {
 946                 close(listen_socket[i].tcp);
 947                 close(listen_socket[i].udp);
 948         }
 949
 950         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 951         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 952         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 953         xasprintf(&envp[3], "NAME=%s", myself->name);
 954
 955         exit_requests();
 956         exit_edges();
 957         exit_subnets();
 958         exit_nodes();
 959         exit_connections();
 960         exit_events();
 961
 962         execute_script("tinc-down", envp);
 963
 964         if(myport) free(myport);
 965
 966         for(i = 0; i < 4; i++)
 967                 free(envp[i]);
 968
 969         devops.close();
 970
 971         return;
 972 }