src/net_setup.c

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2013 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                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &pubkey)) {
 169                         logger(LOG_ERR, "PrivateKey used but no PublicKey found!");
 170                         return false;
 171                 }
 172                 myself->connection->rsa_key = RSA_new();
 173 //              RSA_blinding_on(myself->connection->rsa_key, NULL);
 174                 if(BN_hex2bn(&myself->connection->rsa_key->d, key) != strlen(key)) {
 175                         logger(LOG_ERR, "Invalid PrivateKey for myself!");
 176                         return false;
 177                 }
 178                 if(BN_hex2bn(&myself->connection->rsa_key->n, pubkey) != strlen(pubkey)) {
 179                         logger(LOG_ERR, "Invalid PublicKey for myself!");
 180                         return false;
 181                 }
 182                 BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
 183                 free(key);
 184                 free(pubkey);
 185                 return true;
 186         }
 187
 188         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 189                 xasprintf(&fname, "%s/rsa_key.priv", confbase);
 190
 191         fp = fopen(fname, "r");
 192
 193         if(!fp) {
 194                 logger(LOG_ERR, "Error reading RSA private key file `%s': %s",
 195                            fname, strerror(errno));
 196                 free(fname);
 197                 return false;
 198         }
 199
 200 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 201         struct stat s;
 202
 203         if(fstat(fileno(fp), &s)) {
 204                 logger(LOG_ERR, "Could not stat RSA private key file `%s': %s'",
 205                                 fname, strerror(errno));
 206                 free(fname);
 207                 return false;
 208         }
 209
 210         if(s.st_mode & ~0100700)
 211                 logger(LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 212 #endif
 213
 214         myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
 215         fclose(fp);
 216
 217         if(!myself->connection->rsa_key) {
 218                 logger(LOG_ERR, "Reading RSA private key file `%s' failed: %s",
 219                            fname, strerror(errno));
 220                 free(fname);
 221                 return false;
 222         }
 223
 224         free(fname);
 225         return true;
 226 }
 227
 228 /*
 229   Read Subnets from all host config files
 230 */
 231 void load_all_subnets(void) {
 232         DIR *dir;
 233         struct dirent *ent;
 234         char *dname;
 235         char *fname;
 236         avl_tree_t *config_tree;
 237         config_t *cfg;
 238         subnet_t *s, *s2;
 239         node_t *n;
 240
 241         xasprintf(&dname, "%s/hosts", confbase);
 242         dir = opendir(dname);
 243         if(!dir) {
 244                 logger(LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 245                 free(dname);
 246                 return;
 247         }
 248
 249         while((ent = readdir(dir))) {
 250                 if(!check_id(ent->d_name))
 251                         continue;
 252
 253                 n = lookup_node(ent->d_name);
 254                 #ifdef _DIRENT_HAVE_D_TYPE
 255                 //if(ent->d_type != DT_REG)
 256                 //      continue;
 257                 #endif
 258
 259                 xasprintf(&fname, "%s/hosts/%s", confbase, ent->d_name);
 260                 init_configuration(&config_tree);
 261                 read_config_options(config_tree, ent->d_name);
 262                 read_config_file(config_tree, fname);
 263                 free(fname);
 264
 265                 if(!n) {
 266                         n = new_node();
 267                         n->name = xstrdup(ent->d_name);
 268                         node_add(n);
 269                 }
 270
 271                 for(cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 272                         if(!get_config_subnet(cfg, &s))
 273                                 continue;
 274
 275                         if((s2 = lookup_subnet(n, s))) {
 276                                 s2->expires = -1;
 277                         } else {
 278                                 subnet_add(n, s);
 279                         }
 280                 }
 281
 282                 exit_configuration(&config_tree);
 283         }
 284
 285         closedir(dir);
 286 }
 287
 288 char *get_name(void) {
 289         char *name = NULL;
 290
 291         get_config_string(lookup_config(config_tree, "Name"), &name);
 292
 293         if(!name)
 294                 return NULL;
 295
 296         if(*name == '$') {
 297                 char *envname = getenv(name + 1);
 298                 char hostname[32] = "";
 299                 if(!envname) {
 300                         if(strcmp(name + 1, "HOST")) {
 301                                 fprintf(stderr, "Invalid Name: environment variable %s does not exist\n", name + 1);
 302                                 return false;
 303                         }
 304                         if(gethostname(hostname, sizeof hostname) || !*hostname) {
 305                                 fprintf(stderr, "Could not get hostname: %s\n", strerror(errno));
 306                                 return false;
 307                         }
 308                         hostname[31] = 0;
 309                         envname = hostname;
 310                 }
 311                 free(name);
 312                 name = xstrdup(envname);
 313                 for(char *c = name; *c; c++)
 314                         if(!isalnum(*c))
 315                                 *c = '_';
 316         }
 317
 318         if(!check_id(name)) {
 319                 logger(LOG_ERR, "Invalid name for myself!");
 320                 free(name);
 321                 return false;
 322         }
 323
 324         return name;
 325 }
 326
 327 /*
 328   Configure node_t myself and set up the local sockets (listen only)
 329 */
 330 static bool setup_myself(void) {
 331         config_t *cfg;
 332         subnet_t *subnet;
 333         char *name, *hostname, *mode, *afname, *cipher, *digest, *type;
 334         char *fname = NULL;
 335         char *address = NULL;
 336         char *proxy = NULL;
 337         char *space;
 338         char *envp[5] = {NULL};
 339         struct addrinfo *ai, *aip, hint = {0};
 340         bool choice;
 341         int i, err;
 342         int replaywin_int;
 343
 344         myself = new_node();
 345         myself->connection = new_connection();
 346
 347         myself->hostname = xstrdup("MYSELF");
 348         myself->connection->hostname = xstrdup("MYSELF");
 349
 350         myself->connection->options = 0;
 351         myself->connection->protocol_version = PROT_CURRENT;
 352
 353         if(!(name = get_name())) {
 354                 logger(LOG_ERR, "Name for tinc daemon required!");
 355                 return false;
 356         }
 357
 358         myself->name = name;
 359         myself->connection->name = xstrdup(name);
 360         xasprintf(&fname, "%s/hosts/%s", confbase, name);
 361         read_config_options(config_tree, name);
 362         read_config_file(config_tree, fname);
 363         free(fname);
 364
 365         if(!read_rsa_private_key())
 366                 return false;
 367
 368         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 369                 myport = xstrdup("655");
 370
 371         if(!atoi(myport)) {
 372                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 373                 sockaddr_t sa;
 374                 if(!ai || !ai->ai_addr)
 375                         return false;
 376                 free(myport);
 377                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 378                 sockaddr2str(&sa, NULL, &myport);
 379         }
 380
 381         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 382         if(proxy) {
 383                 if((space = strchr(proxy, ' ')))
 384                         *space++ = 0;
 385
 386                 if(!strcasecmp(proxy, "none")) {
 387                         proxytype = PROXY_NONE;
 388                 } else if(!strcasecmp(proxy, "socks4")) {
 389                         proxytype = PROXY_SOCKS4;
 390                 } else if(!strcasecmp(proxy, "socks4a")) {
 391                         proxytype = PROXY_SOCKS4A;
 392                 } else if(!strcasecmp(proxy, "socks5")) {
 393                         proxytype = PROXY_SOCKS5;
 394                 } else if(!strcasecmp(proxy, "http")) {
 395                         proxytype = PROXY_HTTP;
 396                 } else if(!strcasecmp(proxy, "exec")) {
 397                         proxytype = PROXY_EXEC;
 398                 } else {
 399                         logger(LOG_ERR, "Unknown proxy type %s!", proxy);
 400                         return false;
 401                 }
 402
 403                 switch(proxytype) {
 404                         case PROXY_NONE:
 405                         default:
 406                                 break;
 407
 408                         case PROXY_EXEC:
 409                                 if(!space || !*space) {
 410                                         logger(LOG_ERR, "Argument expected for proxy type exec!");
 411                                         return false;
 412                                 }
 413                                 proxyhost =  xstrdup(space);
 414                                 break;
 415
 416                         case PROXY_SOCKS4:
 417                         case PROXY_SOCKS4A:
 418                         case PROXY_SOCKS5:
 419                         case PROXY_HTTP:
 420                                 proxyhost = space;
 421                                 if(space && (space = strchr(space, ' ')))
 422                                         *space++ = 0, proxyport = space;
 423                                 if(space && (space = strchr(space, ' ')))
 424                                         *space++ = 0, proxyuser = space;
 425                                 if(space && (space = strchr(space, ' ')))
 426                                         *space++ = 0, proxypass = space;
 427                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 428                                         logger(LOG_ERR, "Host and port argument expected for proxy!");
 429                                         return false;
 430                                 }
 431                                 proxyhost = xstrdup(proxyhost);
 432                                 proxyport = xstrdup(proxyport);
 433                                 if(proxyuser && *proxyuser)
 434                                         proxyuser = xstrdup(proxyuser);
 435                                 if(proxypass && *proxypass)
 436                                         proxypass = xstrdup(proxypass);
 437                                 break;
 438                 }
 439
 440                 free(proxy);
 441         }
 442
 443         /* Read in all the subnets specified in the host configuration file */
 444
 445         cfg = lookup_config(config_tree, "Subnet");
 446
 447         while(cfg) {
 448                 if(!get_config_subnet(cfg, &subnet))
 449                         return false;
 450
 451                 subnet_add(myself, subnet);
 452
 453                 cfg = lookup_config_next(config_tree, cfg);
 454         }
 455
 456         /* Check some options */
 457
 458         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 459                 myself->options |= OPTION_INDIRECT;
 460
 461         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 462                 myself->options |= OPTION_TCPONLY;
 463
 464         if(myself->options & OPTION_TCPONLY)
 465                 myself->options |= OPTION_INDIRECT;
 466
 467         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 468         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 469         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 470         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 471         strictsubnets |= tunnelserver;
 472
 473         if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
 474                 if(!strcasecmp(mode, "router"))
 475                         routing_mode = RMODE_ROUTER;
 476                 else if(!strcasecmp(mode, "switch"))
 477                         routing_mode = RMODE_SWITCH;
 478                 else if(!strcasecmp(mode, "hub"))
 479                         routing_mode = RMODE_HUB;
 480                 else {
 481                         logger(LOG_ERR, "Invalid routing mode!");
 482                         return false;
 483                 }
 484                 free(mode);
 485         }
 486
 487         if(get_config_string(lookup_config(config_tree, "Forwarding"), &mode)) {
 488                 if(!strcasecmp(mode, "off"))
 489                         forwarding_mode = FMODE_OFF;
 490                 else if(!strcasecmp(mode, "internal"))
 491                         forwarding_mode = FMODE_INTERNAL;
 492                 else if(!strcasecmp(mode, "kernel"))
 493                         forwarding_mode = FMODE_KERNEL;
 494                 else {
 495                         logger(LOG_ERR, "Invalid forwarding mode!");
 496                         return false;
 497                 }
 498                 free(mode);
 499         }
 500
 501         choice = true;
 502         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 503         if(choice)
 504                 myself->options |= OPTION_PMTU_DISCOVERY;
 505
 506         choice = true;
 507         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 508         if(choice)
 509                 myself->options |= OPTION_CLAMP_MSS;
 510
 511         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 512         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 513         if(get_config_string(lookup_config(config_tree, "Broadcast"), &mode)) {
 514                 if(!strcasecmp(mode, "no"))
 515                         broadcast_mode = BMODE_NONE;
 516                 else if(!strcasecmp(mode, "yes") || !strcasecmp(mode, "mst"))
 517                         broadcast_mode = BMODE_MST;
 518                 else if(!strcasecmp(mode, "direct"))
 519                         broadcast_mode = BMODE_DIRECT;
 520                 else {
 521                         logger(LOG_ERR, "Invalid broadcast mode!");
 522                         return false;
 523                 }
 524                 free(mode);
 525         }
 526
 527 #if !defined(SOL_IP) || !defined(IP_TOS)
 528         if(priorityinheritance)
 529                 logger(LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 530 #endif
 531
 532         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 533                 macexpire = 600;
 534
 535         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 536                 if(maxtimeout <= 0) {
 537                         logger(LOG_ERR, "Bogus maximum timeout!");
 538                         return false;
 539                 }
 540         } else
 541                 maxtimeout = 900;
 542
 543         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 544                 if(udp_rcvbuf <= 0) {
 545                         logger(LOG_ERR, "UDPRcvBuf cannot be negative!");
 546                         return false;
 547                 }
 548         }
 549
 550         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 551                 if(udp_sndbuf <= 0) {
 552                         logger(LOG_ERR, "UDPSndBuf cannot be negative!");
 553                         return false;
 554                 }
 555         }
 556
 557         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 558                 if(replaywin_int < 0) {
 559                         logger(LOG_ERR, "ReplayWindow cannot be negative!");
 560                         return false;
 561                 }
 562                 replaywin = (unsigned)replaywin_int;
 563         }
 564
 565         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 566                 if(!strcasecmp(afname, "IPv4"))
 567                         addressfamily = AF_INET;
 568                 else if(!strcasecmp(afname, "IPv6"))
 569                         addressfamily = AF_INET6;
 570                 else if(!strcasecmp(afname, "any"))
 571                         addressfamily = AF_UNSPEC;
 572                 else {
 573                         logger(LOG_ERR, "Invalid address family!");
 574                         return false;
 575                 }
 576                 free(afname);
 577         }
 578
 579         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 580
 581         /* Generate packet encryption key */
 582
 583         if(get_config_string
 584            (lookup_config(config_tree, "Cipher"), &cipher)) {
 585                 if(!strcasecmp(cipher, "none")) {
 586                         myself->incipher = NULL;
 587                 } else {
 588                         myself->incipher = EVP_get_cipherbyname(cipher);
 589
 590                         if(!myself->incipher) {
 591                                 logger(LOG_ERR, "Unrecognized cipher type!");
 592                                 return false;
 593                         }
 594                 }
 595         } else
 596                 myself->incipher = EVP_bf_cbc();
 597
 598         if(myself->incipher)
 599                 myself->inkeylength = myself->incipher->key_len + myself->incipher->iv_len;
 600         else
 601                 myself->inkeylength = 1;
 602
 603         myself->connection->outcipher = EVP_bf_ofb();
 604
 605         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 606                 keylifetime = 3600;
 607
 608         keyexpires = now + keylifetime;
 609
 610         /* Check if we want to use message authentication codes... */
 611
 612         if(get_config_string(lookup_config(config_tree, "Digest"), &digest)) {
 613                 if(!strcasecmp(digest, "none")) {
 614                         myself->indigest = NULL;
 615                 } else {
 616                         myself->indigest = EVP_get_digestbyname(digest);
 617
 618                         if(!myself->indigest) {
 619                                 logger(LOG_ERR, "Unrecognized digest type!");
 620                                 return false;
 621                         }
 622                 }
 623         } else
 624                 myself->indigest = EVP_sha1();
 625
 626         myself->connection->outdigest = EVP_sha1();
 627
 628         if(get_config_int(lookup_config(config_tree, "MACLength"), &myself->inmaclength)) {
 629                 if(myself->indigest) {
 630                         if(myself->inmaclength > myself->indigest->md_size) {
 631                                 logger(LOG_ERR, "MAC length exceeds size of digest!");
 632                                 return false;
 633                         } else if(myself->inmaclength < 0) {
 634                                 logger(LOG_ERR, "Bogus MAC length!");
 635                                 return false;
 636                         }
 637                 }
 638         } else
 639                 myself->inmaclength = 4;
 640
 641         myself->connection->outmaclength = 0;
 642
 643         /* Compression */
 644
 645         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 646                 if(myself->incompression < 0 || myself->incompression > 11) {
 647                         logger(LOG_ERR, "Bogus compression level!");
 648                         return false;
 649                 }
 650         } else
 651                 myself->incompression = 0;
 652
 653         myself->connection->outcompression = 0;
 654
 655         /* Done */
 656
 657         myself->nexthop = myself;
 658         myself->via = myself;
 659         myself->status.reachable = true;
 660         node_add(myself);
 661
 662         graph();
 663
 664         if(strictsubnets)
 665                 load_all_subnets();
 666
 667         /* Open device */
 668
 669         devops = os_devops;
 670
 671         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 672                 if(!strcasecmp(type, "dummy"))
 673                         devops = dummy_devops;
 674                 else if(!strcasecmp(type, "raw_socket"))
 675                         devops = raw_socket_devops;
 676                 else if(!strcasecmp(type, "multicast"))
 677                         devops = multicast_devops;
 678 #ifdef ENABLE_UML
 679                 else if(!strcasecmp(type, "uml"))
 680                         devops = uml_devops;
 681 #endif
 682 #ifdef ENABLE_VDE
 683                 else if(!strcasecmp(type, "vde"))
 684                         devops = vde_devops;
 685 #endif
 686         }
 687
 688         if(!devops.setup())
 689                 return false;
 690
 691         /* Run tinc-up script to further initialize the tap interface */
 692         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 693         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 694         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 695         xasprintf(&envp[3], "NAME=%s", myself->name);
 696
 697         execute_script("tinc-up", envp);
 698
 699         for(i = 0; i < 4; i++)
 700                 free(envp[i]);
 701
 702         /* Run subnet-up scripts for our own subnets */
 703
 704         subnet_update(myself, NULL, true);
 705
 706         /* Open sockets */
 707
 708         if(!do_detach && getenv("LISTEN_FDS")) {
 709                 sockaddr_t sa;
 710                 socklen_t salen;
 711
 712                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 713 #ifdef HAVE_UNSETENV
 714                 unsetenv("LISTEN_FDS");
 715 #endif
 716
 717                 if(listen_sockets > MAXSOCKETS) {
 718                         logger(LOG_ERR, "Too many listening sockets");
 719                         return false;
 720                 }
 721
 722                 for(i = 0; i < listen_sockets; i++) {
 723                         salen = sizeof sa;
 724                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 725                                 logger(LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
 726                                 return false;
 727                         }
 728
 729                         listen_socket[i].tcp = i + 3;
 730
 731 #ifdef FD_CLOEXEC
 732                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 733 #endif
 734
 735                         listen_socket[i].udp = setup_vpn_in_socket(&sa);
 736                         if(listen_socket[i].udp < 0)
 737                                 return false;
 738
 739                         ifdebug(CONNECTIONS) {
 740                                 hostname = sockaddr2hostname(&sa);
 741                                 logger(LOG_NOTICE, "Listening on %s", hostname);
 742                                 free(hostname);
 743                         }
 744
 745                         memcpy(&listen_socket[i].sa, &sa, salen);
 746                 }
 747         } else {
 748                 listen_sockets = 0;
 749                 cfg = lookup_config(config_tree, "BindToAddress");
 750
 751                 do {
 752                         get_config_string(cfg, &address);
 753                         if(cfg)
 754                                 cfg = lookup_config_next(config_tree, cfg);
 755
 756                         char *port = myport;
 757
 758                         if(address) {
 759                                 char *space = strchr(address, ' ');
 760                                 if(space) {
 761                                         *space++ = 0;
 762                                         port = space;
 763                                 }
 764
 765                                 if(!strcmp(address, "*"))
 766                                         *address = 0;
 767                         }
 768
 769                         hint.ai_family = addressfamily;
 770                         hint.ai_socktype = SOCK_STREAM;
 771                         hint.ai_protocol = IPPROTO_TCP;
 772                         hint.ai_flags = AI_PASSIVE;
 773
 774                         err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 775                         free(address);
 776
 777                         if(err || !ai) {
 778                                 logger(LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
 779                                            gai_strerror(err));
 780                                 return false;
 781                         }
 782
 783                         for(aip = ai; aip; aip = aip->ai_next) {
 784                                 if(listen_sockets >= MAXSOCKETS) {
 785                                         logger(LOG_ERR, "Too many listening sockets");
 786                                         return false;
 787                                 }
 788
 789                                 listen_socket[listen_sockets].tcp =
 790                                         setup_listen_socket((sockaddr_t *) aip->ai_addr);
 791
 792                                 if(listen_socket[listen_sockets].tcp < 0)
 793                                         continue;
 794
 795                                 listen_socket[listen_sockets].udp =
 796                                         setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 797
 798                                 if(listen_socket[listen_sockets].udp < 0)
 799                                         continue;
 800
 801                                 ifdebug(CONNECTIONS) {
 802                                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 803                                         logger(LOG_NOTICE, "Listening on %s", hostname);
 804                                         free(hostname);
 805                                 }
 806
 807                                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 808                                 listen_sockets++;
 809                         }
 810
 811                         freeaddrinfo(ai);
 812                 } while(cfg);
 813         }
 814
 815         if(listen_sockets)
 816                 logger(LOG_NOTICE, "Ready");
 817         else {
 818                 logger(LOG_ERR, "Unable to create any listening socket!");
 819                 return false;
 820         }
 821
 822         return true;
 823 }
 824
 825 /*
 826   initialize network
 827 */
 828 bool setup_network(void) {
 829         now = time(NULL);
 830
 831         init_events();
 832         init_connections();
 833         init_subnets();
 834         init_nodes();
 835         init_edges();
 836         init_requests();
 837
 838         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 839                 if(pinginterval < 1) {
 840                         pinginterval = 86400;
 841                 }
 842         } else
 843                 pinginterval = 60;
 844
 845         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 846                 pingtimeout = 5;
 847         if(pingtimeout < 1 || pingtimeout > pinginterval)
 848                 pingtimeout = pinginterval;
 849
 850         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 851                 maxoutbufsize = 10 * MTU;
 852
 853         if(!setup_myself())
 854                 return false;
 855
 856         return true;
 857 }
 858
 859 /*
 860   close all open network connections
 861 */
 862 void close_network_connections(void) {
 863         avl_node_t *node, *next;
 864         connection_t *c;
 865         char *envp[5] = {NULL};
 866         int i;
 867
 868         for(node = connection_tree->head; node; node = next) {
 869                 next = node->next;
 870                 c = node->data;
 871                 c->outgoing = NULL;
 872                 terminate_connection(c, false);
 873         }
 874
 875         for(list_node_t *node = outgoing_list->head; node; node = node->next) {
 876                 outgoing_t *outgoing = node->data;
 877
 878                 if(outgoing->event)
 879                         event_del(outgoing->event);
 880         }
 881
 882         list_delete_list(outgoing_list);
 883
 884         if(myself && myself->connection) {
 885                 subnet_update(myself, NULL, false);
 886                 terminate_connection(myself->connection, false);
 887                 free_connection(myself->connection);
 888         }
 889
 890         for(i = 0; i < listen_sockets; i++) {
 891                 close(listen_socket[i].tcp);
 892                 close(listen_socket[i].udp);
 893         }
 894
 895         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 896         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 897         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 898         xasprintf(&envp[3], "NAME=%s", myself->name);
 899
 900         exit_requests();
 901         exit_edges();
 902         exit_subnets();
 903         exit_nodes();
 904         exit_connections();
 905         exit_events();
 906
 907         execute_script("tinc-down", envp);
 908
 909         if(myport) free(myport);
 910
 911         for(i = 0; i < 4; i++)
 912                 free(envp[i]);
 913
 914         devops.close();
 915
 916         return;
 917 }