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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2012 Guus Sliepen <guus@tinc-vpn.org>
   5                   2006      Scott Lamb <slamb@slamb.org>
   6                   2010      Brandon Black <blblack@gmail.com>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License along
  19     with this program; if not, write to the Free Software Foundation, Inc.,
  20     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21 */
  22
  23 #include "system.h"
  24
  25 #include "cipher.h"
  26 #include "conf.h"
  27 #include "connection.h"
  28 #include "control.h"
  29 #include "device.h"
  30 #include "digest.h"
  31 #include "ecdsa.h"
  32 #include "graph.h"
  33 #include "logger.h"
  34 #include "net.h"
  35 #include "netutl.h"
  36 #include "process.h"
  37 #include "protocol.h"
  38 #include "route.h"
  39 #include "rsa.h"
  40 #include "subnet.h"
  41 #include "utils.h"
  42 #include "xalloc.h"
  43
  44 char *myport;
  45 static io_t device_io;
  46 devops_t devops;
  47
  48 char *proxyhost;
  49 char *proxyport;
  50 char *proxyuser;
  51 char *proxypass;
  52 proxytype_t proxytype;
  53 int autoconnect;
  54
  55 char *scriptinterpreter;
  56 char *scriptextension;
  57
  58 bool node_read_ecdsa_public_key(node_t *n) {
  59         if(ecdsa_active(&n->ecdsa))
  60                 return true;
  61
  62         splay_tree_t *config_tree;
  63         FILE *fp;
  64         char *pubname = NULL, *hcfname = NULL;
  65         char *p;
  66         bool result = false;
  67
  68         xasprintf(&hcfname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  69
  70         init_configuration(&config_tree);
  71         if(!read_config_file(config_tree, hcfname))
  72                 goto exit;
  73
  74         /* First, check for simple ECDSAPublicKey statement */
  75
  76         if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
  77                 result = ecdsa_set_base64_public_key(&n->ecdsa, p);
  78                 free(p);
  79                 goto exit;
  80         }
  81
  82         /* Else, check for ECDSAPublicKeyFile statement and read it */
  83
  84         if(!get_config_string(lookup_config(config_tree, "ECDSAPublicKeyFile"), &pubname))
  85                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  86
  87         fp = fopen(pubname, "r");
  88
  89         if(!fp) {
  90                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s", pubname, strerror(errno));
  91                 goto exit;
  92         }
  93
  94         result = ecdsa_read_pem_public_key(&n->ecdsa, fp);
  95         fclose(fp);
  96
  97 exit:
  98         exit_configuration(&config_tree);
  99         free(hcfname);
 100         free(pubname);
 101         return result;
 102 }
 103
 104 bool read_ecdsa_public_key(connection_t *c) {
 105         FILE *fp;
 106         char *fname;
 107         char *p;
 108         bool result;
 109
 110         /* First, check for simple ECDSAPublicKey statement */
 111
 112         if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
 113                 result = ecdsa_set_base64_public_key(&c->ecdsa, p);
 114                 free(p);
 115                 return result;
 116         }
 117
 118         /* Else, check for ECDSAPublicKeyFile statement and read it */
 119
 120         if(!get_config_string(lookup_config(c->config_tree, "ECDSAPublicKeyFile"), &fname))
 121                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 122
 123         fp = fopen(fname, "r");
 124
 125         if(!fp) {
 126                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s",
 127                            fname, strerror(errno));
 128                 free(fname);
 129                 return false;
 130         }
 131
 132         result = ecdsa_read_pem_public_key(&c->ecdsa, fp);
 133         fclose(fp);
 134
 135         if(!result)
 136                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing ECDSA public key file `%s' failed.", fname);
 137         free(fname);
 138         return result;
 139 }
 140
 141 bool read_rsa_public_key(connection_t *c) {
 142         FILE *fp;
 143         char *fname;
 144         char *n;
 145         bool result;
 146
 147         /* First, check for simple PublicKey statement */
 148
 149         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 150                 result = rsa_set_hex_public_key(&c->rsa, n, "FFFF");
 151                 free(n);
 152                 return result;
 153         }
 154
 155         /* Else, check for PublicKeyFile statement and read it */
 156
 157         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 158                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 159
 160         fp = fopen(fname, "r");
 161
 162         if(!fp) {
 163                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 164                 free(fname);
 165                 return false;
 166         }
 167
 168         result = rsa_read_pem_public_key(&c->rsa, fp);
 169         fclose(fp);
 170
 171         if(!result)
 172                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 173         free(fname);
 174         return result;
 175 }
 176
 177 static bool read_ecdsa_private_key(void) {
 178         FILE *fp;
 179         char *fname;
 180         bool result;
 181
 182         /* Check for PrivateKeyFile statement and read it */
 183
 184         if(!get_config_string(lookup_config(config_tree, "ECDSAPrivateKeyFile"), &fname))
 185                 xasprintf(&fname, "%s" SLASH "ecdsa_key.priv", confbase);
 186
 187         fp = fopen(fname, "r");
 188
 189         if(!fp) {
 190                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA private key file `%s': %s", fname, strerror(errno));
 191                 free(fname);
 192                 return false;
 193         }
 194
 195 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 196         struct stat s;
 197
 198         if(fstat(fileno(fp), &s)) {
 199                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat ECDSA private key file `%s': %s'", fname, strerror(errno));
 200                 free(fname);
 201                 return false;
 202         }
 203
 204         if(s.st_mode & ~0100700)
 205                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for ECDSA private key file `%s'!", fname);
 206 #endif
 207
 208         result = ecdsa_read_pem_private_key(&myself->connection->ecdsa, fp);
 209         fclose(fp);
 210
 211         if(!result)
 212                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 213         free(fname);
 214         return result;
 215 }
 216
 217 static bool read_rsa_private_key(void) {
 218         FILE *fp;
 219         char *fname;
 220         char *n, *d;
 221         bool result;
 222
 223         /* First, check for simple PrivateKey statement */
 224
 225         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 226                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 227                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 228                         free(d);
 229                         return false;
 230                 }
 231                 result = rsa_set_hex_private_key(&myself->connection->rsa, n, "FFFF", d);
 232                 free(n);
 233                 free(d);
 234                 return result;
 235         }
 236
 237         /* Else, check for PrivateKeyFile statement and read it */
 238
 239         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 240                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 241
 242         fp = fopen(fname, "r");
 243
 244         if(!fp) {
 245                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 246                            fname, strerror(errno));
 247                 free(fname);
 248                 return false;
 249         }
 250
 251 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 252         struct stat s;
 253
 254         if(fstat(fileno(fp), &s)) {
 255                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 256                 free(fname);
 257                 return false;
 258         }
 259
 260         if(s.st_mode & ~0100700)
 261                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 262 #endif
 263
 264         result = rsa_read_pem_private_key(&myself->connection->rsa, fp);
 265         fclose(fp);
 266
 267         if(!result)
 268                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 269         free(fname);
 270         return result;
 271 }
 272
 273 static timeout_t keyexpire_timeout;
 274
 275 static void keyexpire_handler(void *data) {
 276         regenerate_key();
 277         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 278 }
 279
 280 void regenerate_key(void) {
 281         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 282         send_key_changed();
 283 }
 284
 285 /*
 286   Read Subnets from all host config files
 287 */
 288 void load_all_subnets(void) {
 289         DIR *dir;
 290         struct dirent *ent;
 291         char *dname;
 292
 293         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 294         dir = opendir(dname);
 295         if(!dir) {
 296                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 297                 free(dname);
 298                 return;
 299         }
 300
 301         while((ent = readdir(dir))) {
 302                 if(!check_id(ent->d_name))
 303                         continue;
 304
 305                 node_t *n = lookup_node(ent->d_name);
 306                 #ifdef _DIRENT_HAVE_D_TYPE
 307                 //if(ent->d_type != DT_REG)
 308                 //      continue;
 309                 #endif
 310
 311                 char *fname;
 312                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, ent->d_name);
 313
 314                 splay_tree_t *config_tree;
 315                 init_configuration(&config_tree);
 316                 read_config_options(config_tree, ent->d_name);
 317                 read_config_file(config_tree, fname);
 318                 free(fname);
 319
 320                 if(!n) {
 321                         n = new_node();
 322                         n->name = xstrdup(ent->d_name);
 323                         node_add(n);
 324                 }
 325
 326                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 327                         subnet_t *s, *s2;
 328
 329                         if(!get_config_subnet(cfg, &s))
 330                                 continue;
 331
 332                         if((s2 = lookup_subnet(n, s))) {
 333                                 s2->expires = -1;
 334                         } else {
 335                                 subnet_add(n, s);
 336                         }
 337                 }
 338
 339                 exit_configuration(&config_tree);
 340         }
 341
 342         closedir(dir);
 343 }
 344
 345 void load_all_nodes(void) {
 346         DIR *dir;
 347         struct dirent *ent;
 348         char *dname;
 349
 350         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 351         dir = opendir(dname);
 352         if(!dir) {
 353                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 354                 free(dname);
 355                 return;
 356         }
 357
 358         while((ent = readdir(dir))) {
 359                 if(!check_id(ent->d_name))
 360                         continue;
 361
 362                 node_t *n = lookup_node(ent->d_name);
 363                 if(n)
 364                         continue;
 365
 366                 n = new_node();
 367                 n->name = xstrdup(ent->d_name);
 368                 node_add(n);
 369         }
 370
 371         closedir(dir);
 372 }
 373
 374
 375 char *get_name(void) {
 376         char *name = NULL;
 377
 378         get_config_string(lookup_config(config_tree, "Name"), &name);
 379
 380         if(!name)
 381                 return NULL;
 382
 383         if(*name == '$') {
 384                 char *envname = getenv(name + 1);
 385                 if(!envname) {
 386                         if(strcmp(name + 1, "HOST")) {
 387                                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1);
 388                                 return false;
 389                         }
 390                         char envname[32];
 391                         if(gethostname(envname, 32)) {
 392                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", strerror(errno));
 393                                 return false;
 394                         }
 395                         envname[31] = 0;
 396                 }
 397                 free(name);
 398                 name = xstrdup(envname);
 399                 for(char *c = name; *c; c++)
 400                         if(!isalnum(*c))
 401                                 *c = '_';
 402         }
 403
 404         if(!check_id(name)) {
 405                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
 406                 free(name);
 407                 return false;
 408         }
 409
 410         return name;
 411 }
 412
 413 bool setup_myself_reloadable(void) {
 414         char *proxy = NULL;
 415         char *rmode = NULL;
 416         char *fmode = NULL;
 417         char *bmode = NULL;
 418         char *afname = NULL;
 419         char *space;
 420         bool choice;
 421
 422         free(scriptinterpreter);
 423         scriptinterpreter = NULL;
 424         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 425
 426
 427         free(scriptextension);
 428         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 429 #ifdef HAVE_MINGW
 430                 scriptextension = xstrdup(".bat");
 431 #else
 432                 scriptextension = xstrdup("");
 433 #endif
 434
 435         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 436         if(proxy) {
 437                 if((space = strchr(proxy, ' ')))
 438                         *space++ = 0;
 439
 440                 if(!strcasecmp(proxy, "none")) {
 441                         proxytype = PROXY_NONE;
 442                 } else if(!strcasecmp(proxy, "socks4")) {
 443                         proxytype = PROXY_SOCKS4;
 444                 } else if(!strcasecmp(proxy, "socks4a")) {
 445                         proxytype = PROXY_SOCKS4A;
 446                 } else if(!strcasecmp(proxy, "socks5")) {
 447                         proxytype = PROXY_SOCKS5;
 448                 } else if(!strcasecmp(proxy, "http")) {
 449                         proxytype = PROXY_HTTP;
 450                 } else if(!strcasecmp(proxy, "exec")) {
 451                         proxytype = PROXY_EXEC;
 452                 } else {
 453                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 454                         return false;
 455                 }
 456
 457                 switch(proxytype) {
 458                         case PROXY_NONE:
 459                         default:
 460                                 break;
 461
 462                         case PROXY_EXEC:
 463                                 if(!space || !*space) {
 464                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 465                                         return false;
 466                                 }
 467                                 proxyhost =  xstrdup(space);
 468                                 break;
 469
 470                         case PROXY_SOCKS4:
 471                         case PROXY_SOCKS4A:
 472                         case PROXY_SOCKS5:
 473                         case PROXY_HTTP:
 474                                 proxyhost = space;
 475                                 if(space && (space = strchr(space, ' ')))
 476                                         *space++ = 0, proxyport = space;
 477                                 if(space && (space = strchr(space, ' ')))
 478                                         *space++ = 0, proxyuser = space;
 479                                 if(space && (space = strchr(space, ' ')))
 480                                         *space++ = 0, proxypass = space;
 481                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 482                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 483                                         return false;
 484                                 }
 485                                 proxyhost = xstrdup(proxyhost);
 486                                 proxyport = xstrdup(proxyport);
 487                                 if(proxyuser && *proxyuser)
 488                                         proxyuser = xstrdup(proxyuser);
 489                                 if(proxypass && *proxypass)
 490                                         proxypass = xstrdup(proxypass);
 491                                 break;
 492                 }
 493
 494                 free(proxy);
 495         }
 496
 497         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 498                 myself->options |= OPTION_INDIRECT;
 499
 500         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 501                 myself->options |= OPTION_TCPONLY;
 502
 503         if(myself->options & OPTION_TCPONLY)
 504                 myself->options |= OPTION_INDIRECT;
 505
 506         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 507         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 508
 509         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 510                 if(!strcasecmp(rmode, "router"))
 511                         routing_mode = RMODE_ROUTER;
 512                 else if(!strcasecmp(rmode, "switch"))
 513                         routing_mode = RMODE_SWITCH;
 514                 else if(!strcasecmp(rmode, "hub"))
 515                         routing_mode = RMODE_HUB;
 516                 else {
 517                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 518                         return false;
 519                 }
 520                 free(rmode);
 521         }
 522
 523         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 524                 if(!strcasecmp(fmode, "off"))
 525                         forwarding_mode = FMODE_OFF;
 526                 else if(!strcasecmp(fmode, "internal"))
 527                         forwarding_mode = FMODE_INTERNAL;
 528                 else if(!strcasecmp(fmode, "kernel"))
 529                         forwarding_mode = FMODE_KERNEL;
 530                 else {
 531                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 532                         return false;
 533                 }
 534                 free(fmode);
 535         }
 536
 537         choice = true;
 538         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 539         if(choice)
 540                 myself->options |= OPTION_PMTU_DISCOVERY;
 541
 542         choice = true;
 543         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 544         if(choice)
 545                 myself->options |= OPTION_CLAMP_MSS;
 546
 547         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 548         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 549         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 550                 if(!strcasecmp(bmode, "no"))
 551                         broadcast_mode = BMODE_NONE;
 552                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 553                         broadcast_mode = BMODE_MST;
 554                 else if(!strcasecmp(bmode, "direct"))
 555                         broadcast_mode = BMODE_DIRECT;
 556                 else {
 557                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 558                         return false;
 559                 }
 560                 free(bmode);
 561         }
 562
 563 #if !defined(SOL_IP) || !defined(IP_TOS)
 564         if(priorityinheritance)
 565                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 566 #endif
 567
 568         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 569                 macexpire = 600;
 570
 571         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 572                 if(maxtimeout <= 0) {
 573                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 574                         return false;
 575                 }
 576         } else
 577                 maxtimeout = 900;
 578
 579         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 580                 if(!strcasecmp(afname, "IPv4"))
 581                         addressfamily = AF_INET;
 582                 else if(!strcasecmp(afname, "IPv6"))
 583                         addressfamily = AF_INET6;
 584                 else if(!strcasecmp(afname, "any"))
 585                         addressfamily = AF_UNSPEC;
 586                 else {
 587                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 588                         return false;
 589                 }
 590                 free(afname);
 591         }
 592
 593         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 594
 595         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 596                 keylifetime = 3600;
 597
 598         get_config_int(lookup_config(config_tree, "AutoConnect"), &autoconnect);
 599
 600         return true;
 601 }
 602
 603 /*
 604   Configure node_t myself and set up the local sockets (listen only)
 605 */
 606 static bool setup_myself(void) {
 607         char *name, *hostname, *cipher, *digest, *type;
 608         char *fname = NULL;
 609         char *address = NULL;
 610
 611         if(!(name = get_name())) {
 612                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 613                 return false;
 614         }
 615
 616         myself = new_node();
 617         myself->connection = new_connection();
 618         myself->name = name;
 619         myself->connection->name = xstrdup(name);
 620         xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 621         read_config_options(config_tree, name);
 622         read_config_file(config_tree, fname);
 623         free(fname);
 624
 625         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 626                 myport = xstrdup("655");
 627
 628         xasprintf(&myself->hostname, "MYSELF port %s", myport);
 629         myself->connection->hostname = xstrdup(myself->hostname);
 630
 631         myself->connection->options = 0;
 632         myself->connection->protocol_major = PROT_MAJOR;
 633         myself->connection->protocol_minor = PROT_MINOR;
 634
 635         myself->options |= PROT_MINOR << 24;
 636
 637         get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental);
 638
 639         if(experimental && !read_ecdsa_private_key())
 640                 return false;
 641
 642         if(!read_rsa_private_key())
 643                 return false;
 644
 645         if(!atoi(myport)) {
 646                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 647                 sockaddr_t sa;
 648                 if(!ai || !ai->ai_addr)
 649                         return false;
 650                 free(myport);
 651                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 652                 sockaddr2str(&sa, NULL, &myport);
 653         }
 654
 655         /* Read in all the subnets specified in the host configuration file */
 656
 657         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 658                 subnet_t *subnet;
 659
 660                 if(!get_config_subnet(cfg, &subnet))
 661                         return false;
 662
 663                 subnet_add(myself, subnet);
 664         }
 665
 666         /* Check some options */
 667
 668         if(!setup_myself_reloadable())
 669                 return false;
 670
 671         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 672         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 673         strictsubnets |= tunnelserver;
 674
 675
 676
 677         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 678                 if(udp_rcvbuf <= 0) {
 679                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 680                         return false;
 681                 }
 682         }
 683
 684         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 685                 if(udp_sndbuf <= 0) {
 686                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 687                         return false;
 688                 }
 689         }
 690
 691         int replaywin_int;
 692         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 693                 if(replaywin_int < 0) {
 694                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 695                         return false;
 696                 }
 697                 replaywin = (unsigned)replaywin_int;
 698                 sptps_replaywin = replaywin;
 699         }
 700
 701         /* Generate packet encryption key */
 702
 703         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 704                 cipher = xstrdup("blowfish");
 705
 706         if(!cipher_open_by_name(&myself->incipher, cipher)) {
 707                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 708                 return false;
 709         }
 710
 711         free(cipher);
 712
 713         send_key_changed();
 714         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 715
 716         /* Check if we want to use message authentication codes... */
 717
 718         int maclength = 4;
 719         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 720
 721         if(maclength < 0) {
 722                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 723                 return false;
 724         }
 725
 726         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 727                 digest = xstrdup("sha1");
 728
 729         if(!digest_open_by_name(&myself->indigest, digest, maclength)) {
 730                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 731                 return false;
 732         }
 733
 734         free(digest);
 735
 736         /* Compression */
 737
 738         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 739                 if(myself->incompression < 0 || myself->incompression > 11) {
 740                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 741                         return false;
 742                 }
 743         } else
 744                 myself->incompression = 0;
 745
 746         myself->connection->outcompression = 0;
 747
 748         /* Done */
 749
 750         myself->nexthop = myself;
 751         myself->via = myself;
 752         myself->status.reachable = true;
 753         myself->last_state_change = time(NULL);
 754         myself->status.sptps = experimental;
 755         node_add(myself);
 756
 757         graph();
 758
 759         if(strictsubnets)
 760                 load_all_subnets();
 761         else if(autoconnect)
 762                 load_all_nodes();
 763
 764         /* Open device */
 765
 766         devops = os_devops;
 767
 768         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 769                 if(!strcasecmp(type, "dummy"))
 770                         devops = dummy_devops;
 771                 else if(!strcasecmp(type, "raw_socket"))
 772                         devops = raw_socket_devops;
 773                 else if(!strcasecmp(type, "multicast"))
 774                         devops = multicast_devops;
 775 #ifdef ENABLE_UML
 776                 else if(!strcasecmp(type, "uml"))
 777                         devops = uml_devops;
 778 #endif
 779 #ifdef ENABLE_VDE
 780                 else if(!strcasecmp(type, "vde"))
 781                         devops = vde_devops;
 782 #endif
 783         }
 784
 785         if(!devops.setup())
 786                 return false;
 787
 788         if(device_fd >= 0)
 789                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 790
 791         /* Run tinc-up script to further initialize the tap interface */
 792         char *envp[5];
 793         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 794         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 795         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 796         xasprintf(&envp[3], "NAME=%s", myself->name);
 797         envp[4] = NULL;
 798
 799         execute_script("tinc-up", envp);
 800
 801         for(int i = 0; i < 4; i++)
 802                 free(envp[i]);
 803
 804         /* Run subnet-up scripts for our own subnets */
 805
 806         subnet_update(myself, NULL, true);
 807
 808         /* Open sockets */
 809
 810         if(!do_detach && getenv("LISTEN_FDS")) {
 811                 sockaddr_t sa;
 812                 socklen_t salen;
 813
 814                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 815 #ifdef HAVE_UNSETENV
 816                 unsetenv("LISTEN_FDS");
 817 #endif
 818
 819                 if(listen_sockets > MAXSOCKETS) {
 820                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 821                         return false;
 822                 }
 823
 824                 for(int i = 0; i < listen_sockets; i++) {
 825                         salen = sizeof sa;
 826                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 827                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
 828                                 return false;
 829                         }
 830
 831 #ifdef FD_CLOEXEC
 832                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 833 #endif
 834
 835                         int udp_fd = setup_vpn_in_socket(&sa);
 836                         if(udp_fd < 0)
 837                                 return false;
 838
 839                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
 840                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
 841
 842                         if(debug_level >= DEBUG_CONNECTIONS) {
 843                                 hostname = sockaddr2hostname(&sa);
 844                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 845                                 free(hostname);
 846                         }
 847
 848                         memcpy(&listen_socket[i].sa, &sa, salen);
 849                 }
 850         } else {
 851                 listen_sockets = 0;
 852                 config_t *cfg = lookup_config(config_tree, "BindToAddress");
 853
 854                 do {
 855                         get_config_string(cfg, &address);
 856                         if(cfg)
 857                                 cfg = lookup_config_next(config_tree, cfg);
 858
 859                         char *port = myport;
 860
 861                         if(address) {
 862                                 char *space = strchr(address, ' ');
 863                                 if(space) {
 864                                         *space++ = 0;
 865                                         port = space;
 866                                 }
 867
 868                                 if(!strcmp(address, "*"))
 869                                         *address = 0;
 870                         }
 871
 872                         struct addrinfo *ai, hint = {0};
 873                         hint.ai_family = addressfamily;
 874                         hint.ai_socktype = SOCK_STREAM;
 875                         hint.ai_protocol = IPPROTO_TCP;
 876                         hint.ai_flags = AI_PASSIVE;
 877
 878                         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 879                         free(address);
 880
 881                         if(err || !ai) {
 882                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
 883                                            gai_strerror(err));
 884                                 return false;
 885                         }
 886
 887                         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 888                                 if(listen_sockets >= MAXSOCKETS) {
 889                                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 890                                         return false;
 891                                 }
 892
 893                                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 894
 895                                 if(tcp_fd < 0)
 896                                         continue;
 897
 898                                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 899
 900                                 if(tcp_fd < 0) {
 901                                         close(tcp_fd);
 902                                         continue;
 903                                 }
 904
 905                                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 906                                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 907
 908                                 if(debug_level >= DEBUG_CONNECTIONS) {
 909                                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 910                                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 911                                         free(hostname);
 912                                 }
 913
 914                                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 915                                 listen_sockets++;
 916                         }
 917
 918                         freeaddrinfo(ai);
 919                 } while(cfg);
 920         }
 921
 922         if(listen_sockets)
 923                 logger(DEBUG_ALWAYS, LOG_NOTICE, "Ready");
 924         else {
 925                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
 926                 return false;
 927         }
 928
 929         last_config_check = time(NULL);
 930
 931         return true;
 932 }
 933
 934 /*
 935   initialize network
 936 */
 937 bool setup_network(void) {
 938         init_connections();
 939         init_subnets();
 940         init_nodes();
 941         init_edges();
 942         init_requests();
 943
 944         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 945                 if(pinginterval < 1) {
 946                         pinginterval = 86400;
 947                 }
 948         } else
 949                 pinginterval = 60;
 950
 951         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 952                 pingtimeout = 5;
 953         if(pingtimeout < 1 || pingtimeout > pinginterval)
 954                 pingtimeout = pinginterval;
 955
 956         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 957                 maxoutbufsize = 10 * MTU;
 958
 959         if(!setup_myself())
 960                 return false;
 961
 962         return true;
 963 }
 964
 965 /*
 966   close all open network connections
 967 */
 968 void close_network_connections(void) {
 969         for(list_node_t *node = connection_list->head, *next; node; node = next) {
 970                 next = node->next;
 971                 connection_t *c = node->data;
 972                 /* Keep control connections open until the end, so they know when we really terminated */
 973                 if(c->status.control)
 974                         c->socket = -1;
 975                 c->outgoing = NULL;
 976                 terminate_connection(c, false);
 977         }
 978
 979         list_delete_list(outgoing_list);
 980
 981         if(myself && myself->connection) {
 982                 subnet_update(myself, NULL, false);
 983                 terminate_connection(myself->connection, false);
 984                 free_connection(myself->connection);
 985         }
 986
 987         for(int i = 0; i < listen_sockets; i++) {
 988                 io_del(&listen_socket[i].tcp);
 989                 io_del(&listen_socket[i].udp);
 990                 close(listen_socket[i].tcp.fd);
 991                 close(listen_socket[i].udp.fd);
 992         }
 993
 994         char *envp[5];
 995         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 996         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 997         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 998         xasprintf(&envp[3], "NAME=%s", myself->name);
 999         envp[4] = NULL;
1000
1001         exit_requests();
1002         exit_edges();
1003         exit_subnets();
1004         exit_nodes();
1005         exit_connections();
1006
1007         execute_script("tinc-down", envp);
1008
1009         if(myport) free(myport);
1010
1011         for(int i = 0; i < 4; i++)
1012                 free(envp[i]);
1013
1014         devops.close();
1015
1016         return;
1017 }