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 <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 "route.h"
  43 #include "subnet.h"
  44 #include "utils.h"
  45 #include "xalloc.h"
  46
  47 char *myport;
  48 devops_t devops;
  49
  50 char *proxyhost;
  51 char *proxyport;
  52 char *proxyuser;
  53 char *proxypass;
  54 proxytype_t proxytype;
  55
  56 bool read_rsa_public_key(connection_t *c) {
  57         FILE *fp;
  58         char *pubname;
  59         char *hcfname;
  60         char *key;
  61
  62         if(!c->rsa_key) {
  63                 c->rsa_key = RSA_new();
  64 //              RSA_blinding_on(c->rsa_key, NULL);
  65         }
  66
  67         /* First, check for simple PublicKey statement */
  68
  69         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) {
  70                 if(BN_hex2bn(&c->rsa_key->n, key) != strlen(key)) {
  71                         logger(LOG_ERR, "Invalid PublicKey for %s!", c->name);
  72                         return false;
  73                 }
  74                 BN_hex2bn(&c->rsa_key->e, "FFFF");
  75                 free(key);
  76                 return true;
  77         }
  78
  79         /* Else, check for PublicKeyFile statement and read it */
  80
  81         if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &pubname)) {
  82                 fp = fopen(pubname, "r");
  83
  84                 if(!fp) {
  85                         logger(LOG_ERR, "Error reading RSA public key file `%s': %s", pubname, strerror(errno));
  86                         free(pubname);
  87                         return false;
  88                 }
  89
  90                 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
  91                 fclose(fp);
  92
  93                 if(c->rsa_key) {
  94                         free(pubname);
  95                         return true;            /* Woohoo. */
  96                 }
  97
  98                 /* If it fails, try PEM_read_RSA_PUBKEY. */
  99                 fp = fopen(pubname, "r");
 100
 101                 if(!fp) {
 102                         logger(LOG_ERR, "Error reading RSA public key file `%s': %s", pubname, strerror(errno));
 103                         free(pubname);
 104                         return false;
 105                 }
 106
 107                 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
 108                 fclose(fp);
 109
 110                 if(c->rsa_key) {
 111 //                              RSA_blinding_on(c->rsa_key, NULL);
 112                         free(pubname);
 113                         return true;
 114                 }
 115
 116                 logger(LOG_ERR, "Reading RSA public key file `%s' failed: %s", pubname, strerror(errno));
 117                 free(pubname);
 118                 return false;
 119         }
 120
 121         /* Else, check if a harnessed public key is in the config file */
 122
 123         xasprintf(&hcfname, "%s/hosts/%s", confbase, c->name);
 124         fp = fopen(hcfname, "r");
 125
 126         if(!fp) {
 127                 logger(LOG_ERR, "Error reading RSA public key file `%s': %s", hcfname, strerror(errno));
 128                 free(hcfname);
 129                 return false;
 130         }
 131
 132         c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
 133         fclose(fp);
 134
 135         if(c->rsa_key) {
 136                 free(hcfname);
 137                 return true;
 138         }
 139
 140         /* Try again with PEM_read_RSA_PUBKEY. */
 141
 142         fp = fopen(hcfname, "r");
 143
 144         if(!fp) {
 145                 logger(LOG_ERR, "Error reading RSA public key file `%s': %s", hcfname, strerror(errno));
 146                 free(hcfname);
 147                 return false;
 148         }
 149
 150         free(hcfname);
 151         c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
 152 //      RSA_blinding_on(c->rsa_key, NULL);
 153         fclose(fp);
 154
 155         if(c->rsa_key)
 156                 return true;
 157
 158         logger(LOG_ERR, "No public key for %s specified!", c->name);
 159
 160         return false;
 161 }
 162
 163 static bool read_rsa_private_key(void) {
 164         FILE *fp;
 165         char *fname, *key, *pubkey;
 166
 167         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
 168                 myself->connection->rsa_key = RSA_new();
 169 //              RSA_blinding_on(myself->connection->rsa_key, NULL);
 170                 if(BN_hex2bn(&myself->connection->rsa_key->d, key) != strlen(key)) {
 171                         logger(LOG_ERR, "Invalid PrivateKey for myself!");
 172                         free(key);
 173                         return false;
 174                 }
 175                 free(key);
 176                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &pubkey)) {
 177                         logger(LOG_ERR, "PrivateKey used but no PublicKey found!");
 178                         return false;
 179                 }
 180                 if(BN_hex2bn(&myself->connection->rsa_key->n, pubkey) != strlen(pubkey)) {
 181                         logger(LOG_ERR, "Invalid PublicKey for myself!");
 182                         free(pubkey);
 183                         return false;
 184                 }
 185                 free(pubkey);
 186                 BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
 187                 return true;
 188         }
 189
 190         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 191                 xasprintf(&fname, "%s/rsa_key.priv", confbase);
 192
 193         fp = fopen(fname, "r");
 194
 195         if(!fp) {
 196                 logger(LOG_ERR, "Error reading RSA private key file `%s': %s",
 197                            fname, strerror(errno));
 198                 free(fname);
 199                 return false;
 200         }
 201
 202 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 203         struct stat s;
 204
 205         if(!fstat(fileno(fp), &s)) {
 206                 if(s.st_mode & ~0100700)
 207                         logger(LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 208         } else {
 209                 logger(LOG_WARNING, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 210         }
 211 #endif
 212
 213         myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
 214         fclose(fp);
 215
 216         if(!myself->connection->rsa_key) {
 217                 logger(LOG_ERR, "Reading RSA private key file `%s' failed: %s",
 218                            fname, strerror(errno));
 219                 free(fname);
 220                 return false;
 221         }
 222
 223         free(fname);
 224         return true;
 225 }
 226
 227 /*
 228   Read Subnets from all host config files
 229 */
 230 void load_all_subnets(void) {
 231         DIR *dir;
 232         struct dirent *ent;
 233         char *dname;
 234         char *fname;
 235         avl_tree_t *config_tree;
 236         config_t *cfg;
 237         subnet_t *s, *s2;
 238         node_t *n;
 239
 240         xasprintf(&dname, "%s/hosts", confbase);
 241         dir = opendir(dname);
 242         if(!dir) {
 243                 logger(LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 244                 free(dname);
 245                 return;
 246         }
 247
 248         while((ent = readdir(dir))) {
 249                 if(!check_id(ent->d_name))
 250                         continue;
 251
 252                 n = lookup_node(ent->d_name);
 253                 #ifdef _DIRENT_HAVE_D_TYPE
 254                 //if(ent->d_type != DT_REG)
 255                 //      continue;
 256                 #endif
 257
 258                 xasprintf(&fname, "%s/hosts/%s", confbase, ent->d_name);
 259                 init_configuration(&config_tree);
 260                 read_config_options(config_tree, ent->d_name);
 261                 read_config_file(config_tree, fname);
 262                 free(fname);
 263
 264                 if(!n) {
 265                         n = new_node();
 266                         n->name = xstrdup(ent->d_name);
 267                         node_add(n);
 268                 }
 269
 270                 for(cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 271                         if(!get_config_subnet(cfg, &s))
 272                                 continue;
 273
 274                         if((s2 = lookup_subnet(n, s))) {
 275                                 s2->expires = -1;
 276                         } else {
 277                                 subnet_add(n, s);
 278                         }
 279                 }
 280
 281                 exit_configuration(&config_tree);
 282         }
 283
 284         closedir(dir);
 285 }
 286
 287 char *get_name(void) {
 288         char *name = NULL;
 289
 290         get_config_string(lookup_config(config_tree, "Name"), &name);
 291
 292         if(!name)
 293                 return NULL;
 294
 295         if(*name == '$') {
 296                 char *envname = getenv(name + 1);
 297                 char hostname[32] = "";
 298                 if(!envname) {
 299                         if(strcmp(name + 1, "HOST")) {
 300                                 fprintf(stderr, "Invalid Name: environment variable %s does not exist\n", name + 1);
 301                                 free(name);
 302                                 return false;
 303                         }
 304                         if(gethostname(hostname, sizeof hostname) || !*hostname) {
 305                                 fprintf(stderr, "Could not get hostname: %s\n", strerror(errno));
 306                                 free(name);
 307                                 return false;
 308                         }
 309                         hostname[31] = 0;
 310                         envname = hostname;
 311                 }
 312                 free(name);
 313                 name = xstrdup(envname);
 314                 for(char *c = name; *c; c++)
 315                         if(!isalnum(*c))
 316                                 *c = '_';
 317         }
 318
 319         if(!check_id(name)) {
 320                 logger(LOG_ERR, "Invalid name for myself!");
 321                 free(name);
 322                 return false;
 323         }
 324
 325         return name;
 326 }
 327
 328 /*
 329   Configure node_t myself and set up the local sockets (listen only)
 330 */
 331 static bool setup_myself(void) {
 332         config_t *cfg;
 333         subnet_t *subnet;
 334         char *name, *hostname, *mode, *afname, *cipher, *digest, *type;
 335         char *fname = NULL;
 336         char *address = NULL;
 337         char *proxy = NULL;
 338         char *space;
 339         char *envp[5] = {NULL};
 340         struct addrinfo *ai, *aip, hint = {0};
 341         bool choice;
 342         int i, err;
 343         int replaywin_int;
 344         bool port_specified = false;
 345
 346         myself = new_node();
 347         myself->connection = new_connection();
 348
 349         myself->hostname = xstrdup("MYSELF");
 350         myself->connection->hostname = xstrdup("MYSELF");
 351
 352         myself->connection->options = 0;
 353         myself->connection->protocol_version = PROT_CURRENT;
 354
 355         if(!(name = get_name())) {
 356                 logger(LOG_ERR, "Name for tinc daemon required!");
 357                 return false;
 358         }
 359
 360         /* Read tinc.conf and our own host config file */
 361
 362         myself->name = name;
 363         myself->connection->name = xstrdup(name);
 364         xasprintf(&fname, "%s/hosts/%s", confbase, name);
 365         read_config_options(config_tree, name);
 366         read_config_file(config_tree, fname);
 367         free(fname);
 368
 369         if(!read_rsa_private_key())
 370                 return false;
 371
 372         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 373                 myport = xstrdup("655");
 374         else
 375                 port_specified = true;
 376
 377         /* Ensure myport is numeric */
 378
 379         if(!atoi(myport)) {
 380                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 381                 sockaddr_t sa;
 382                 if(!ai || !ai->ai_addr)
 383                         return false;
 384                 free(myport);
 385                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 386                 sockaddr2str(&sa, NULL, &myport);
 387         }
 388
 389         if(get_config_string(lookup_config(config_tree, "Proxy"), &proxy)) {
 390                 if((space = strchr(proxy, ' ')))
 391                         *space++ = 0;
 392
 393                 if(!strcasecmp(proxy, "none")) {
 394                         proxytype = PROXY_NONE;
 395                 } else if(!strcasecmp(proxy, "socks4")) {
 396                         proxytype = PROXY_SOCKS4;
 397                 } else if(!strcasecmp(proxy, "socks4a")) {
 398                         proxytype = PROXY_SOCKS4A;
 399                 } else if(!strcasecmp(proxy, "socks5")) {
 400                         proxytype = PROXY_SOCKS5;
 401                 } else if(!strcasecmp(proxy, "http")) {
 402                         proxytype = PROXY_HTTP;
 403                 } else if(!strcasecmp(proxy, "exec")) {
 404                         proxytype = PROXY_EXEC;
 405                 } else {
 406                         logger(LOG_ERR, "Unknown proxy type %s!", proxy);
 407                         free(proxy);
 408                         return false;
 409                 }
 410
 411                 switch(proxytype) {
 412                         case PROXY_NONE:
 413                         default:
 414                                 break;
 415
 416                         case PROXY_EXEC:
 417                                 if(!space || !*space) {
 418                                         logger(LOG_ERR, "Argument expected for proxy type exec!");
 419                                         free(proxy);
 420                                         return false;
 421                                 }
 422                                 proxyhost =  xstrdup(space);
 423                                 break;
 424
 425                         case PROXY_SOCKS4:
 426                         case PROXY_SOCKS4A:
 427                         case PROXY_SOCKS5:
 428                         case PROXY_HTTP:
 429                                 proxyhost = space;
 430                                 if(space && (space = strchr(space, ' ')))
 431                                         *space++ = 0, proxyport = space;
 432                                 if(space && (space = strchr(space, ' ')))
 433                                         *space++ = 0, proxyuser = space;
 434                                 if(space && (space = strchr(space, ' ')))
 435                                         *space++ = 0, proxypass = space;
 436                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 437                                         logger(LOG_ERR, "Host and port argument expected for proxy!");
 438                                         free(proxy);
 439                                         return false;
 440                                 }
 441                                 proxyhost = xstrdup(proxyhost);
 442                                 proxyport = xstrdup(proxyport);
 443                                 if(proxyuser && *proxyuser)
 444                                         proxyuser = xstrdup(proxyuser);
 445                                 if(proxypass && *proxypass)
 446                                         proxypass = xstrdup(proxypass);
 447                                 break;
 448                 }
 449
 450                 free(proxy);
 451         }
 452
 453         /* Read in all the subnets specified in the host configuration file */
 454
 455         cfg = lookup_config(config_tree, "Subnet");
 456
 457         while(cfg) {
 458                 if(!get_config_subnet(cfg, &subnet))
 459                         return false;
 460
 461                 subnet_add(myself, subnet);
 462
 463                 cfg = lookup_config_next(config_tree, cfg);
 464         }
 465
 466         /* Check some options */
 467
 468         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 469                 myself->options |= OPTION_INDIRECT;
 470
 471         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 472                 myself->options |= OPTION_TCPONLY;
 473
 474         if(myself->options & OPTION_TCPONLY)
 475                 myself->options |= OPTION_INDIRECT;
 476
 477         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 478         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 479         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 480         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 481         strictsubnets |= tunnelserver;
 482
 483         if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
 484                 if(!strcasecmp(mode, "router"))
 485                         routing_mode = RMODE_ROUTER;
 486                 else if(!strcasecmp(mode, "switch"))
 487                         routing_mode = RMODE_SWITCH;
 488                 else if(!strcasecmp(mode, "hub"))
 489                         routing_mode = RMODE_HUB;
 490                 else {
 491                         logger(LOG_ERR, "Invalid routing mode!");
 492                         free(mode);
 493                         return false;
 494                 }
 495                 free(mode);
 496         }
 497
 498         if(get_config_string(lookup_config(config_tree, "Forwarding"), &mode)) {
 499                 if(!strcasecmp(mode, "off"))
 500                         forwarding_mode = FMODE_OFF;
 501                 else if(!strcasecmp(mode, "internal"))
 502                         forwarding_mode = FMODE_INTERNAL;
 503                 else if(!strcasecmp(mode, "kernel"))
 504                         forwarding_mode = FMODE_KERNEL;
 505                 else {
 506                         logger(LOG_ERR, "Invalid forwarding mode!");
 507                         free(mode);
 508                         return false;
 509                 }
 510                 free(mode);
 511         }
 512
 513         choice = true;
 514         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 515         if(choice)
 516                 myself->options |= OPTION_PMTU_DISCOVERY;
 517
 518         choice = true;
 519         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 520         if(choice)
 521                 myself->options |= OPTION_CLAMP_MSS;
 522
 523         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 524         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 525         if(get_config_string(lookup_config(config_tree, "Broadcast"), &mode)) {
 526                 if(!strcasecmp(mode, "no"))
 527                         broadcast_mode = BMODE_NONE;
 528                 else if(!strcasecmp(mode, "yes") || !strcasecmp(mode, "mst"))
 529                         broadcast_mode = BMODE_MST;
 530                 else if(!strcasecmp(mode, "direct"))
 531                         broadcast_mode = BMODE_DIRECT;
 532                 else {
 533                         logger(LOG_ERR, "Invalid broadcast mode!");
 534                         free(mode);
 535                         return false;
 536                 }
 537                 free(mode);
 538         }
 539
 540 #if !defined(SOL_IP) || !defined(IP_TOS)
 541         if(priorityinheritance)
 542                 logger(LOG_WARNING, "%s not supported on this platform", "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                         err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 812                         free(address);
 813
 814                         if(err || !ai) {
 815                                 logger(LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
 816                                            gai_strerror(err));
 817                                 return false;
 818                         }
 819
 820                         for(aip = ai; aip; aip = aip->ai_next) {
 821                                 if(listen_sockets >= MAXSOCKETS) {
 822                                         logger(LOG_ERR, "Too many listening sockets");
 823                                         return false;
 824                                 }
 825
 826                                 listen_socket[listen_sockets].tcp =
 827                                         setup_listen_socket((sockaddr_t *) aip->ai_addr);
 828
 829                                 if(listen_socket[listen_sockets].tcp < 0)
 830                                         continue;
 831
 832                                 listen_socket[listen_sockets].udp =
 833                                         setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 834
 835                                 if(listen_socket[listen_sockets].udp < 0)
 836                                         continue;
 837
 838                                 ifdebug(CONNECTIONS) {
 839                                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 840                                         logger(LOG_NOTICE, "Listening on %s", hostname);
 841                                         free(hostname);
 842                                 }
 843
 844                                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 845                                 listen_sockets++;
 846                         }
 847
 848                         freeaddrinfo(ai);
 849                 } while(cfg);
 850         }
 851
 852         if(!listen_sockets) {
 853                 logger(LOG_ERR, "Unable to create any listening socket!");
 854                 return false;
 855         }
 856
 857         /* If no Port option was specified, set myport to the port used by the first listening socket. */
 858
 859         if(!port_specified) {
 860                 sockaddr_t sa;
 861                 socklen_t salen = sizeof sa;
 862                 if(!getsockname(listen_socket[0].udp, &sa.sa, &salen)) {
 863                         free(myport);
 864                         sockaddr2str(&sa, NULL, &myport);
 865                         if(!myport)
 866                                 myport = xstrdup("655");
 867                 }
 868         }
 869
 870         /* Done. */
 871
 872         logger(LOG_NOTICE, "Ready");
 873         return true;
 874 }
 875
 876 /*
 877   initialize network
 878 */
 879 bool setup_network(void) {
 880         now = time(NULL);
 881
 882         init_events();
 883         init_connections();
 884         init_subnets();
 885         init_nodes();
 886         init_edges();
 887         init_requests();
 888
 889         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 890                 if(pinginterval < 1) {
 891                         pinginterval = 86400;
 892                 }
 893         } else
 894                 pinginterval = 60;
 895
 896         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 897                 pingtimeout = 5;
 898         if(pingtimeout < 1 || pingtimeout > pinginterval)
 899                 pingtimeout = pinginterval;
 900
 901         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 902                 maxoutbufsize = 10 * MTU;
 903
 904         if(!setup_myself())
 905                 return false;
 906
 907         return true;
 908 }
 909
 910 /*
 911   close all open network connections
 912 */
 913 void close_network_connections(void) {
 914         avl_node_t *node, *next;
 915         connection_t *c;
 916         char *envp[5] = {NULL};
 917         int i;
 918
 919         for(node = connection_tree->head; node; node = next) {
 920                 next = node->next;
 921                 c = node->data;
 922                 c->outgoing = NULL;
 923                 terminate_connection(c, false);
 924         }
 925
 926         for(list_node_t *node = outgoing_list->head; node; node = node->next) {
 927                 outgoing_t *outgoing = node->data;
 928
 929                 if(outgoing->event)
 930                         event_del(outgoing->event);
 931         }
 932
 933         list_delete_list(outgoing_list);
 934
 935         if(myself && myself->connection) {
 936                 subnet_update(myself, NULL, false);
 937                 terminate_connection(myself->connection, false);
 938                 free_connection(myself->connection);
 939         }
 940
 941         for(i = 0; i < listen_sockets; i++) {
 942                 close(listen_socket[i].tcp);
 943                 close(listen_socket[i].udp);
 944         }
 945
 946         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 947         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 948         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 949         xasprintf(&envp[3], "NAME=%s", myself->name);
 950
 951         exit_requests();
 952         exit_edges();
 953         exit_subnets();
 954         exit_nodes();
 955         exit_connections();
 956         exit_events();
 957
 958         execute_script("tinc-down", envp);
 959
 960         if(myport) free(myport);
 961
 962         for(i = 0; i < 4; i++)
 963                 free(envp[i]);
 964
 965         devops.close();
 966
 967         return;
 968 }