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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2013 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 "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 "names.h"
  35 #include "net.h"
  36 #include "netutl.h"
  37 #include "process.h"
  38 #include "protocol.h"
  39 #include "route.h"
  40 #include "rsa.h"
  41 #include "subnet.h"
  42 #include "utils.h"
  43 #include "xalloc.h"
  44
  45 char *myport;
  46 static io_t device_io;
  47 devops_t devops;
  48
  49 char *proxyhost;
  50 char *proxyport;
  51 char *proxyuser;
  52 char *proxypass;
  53 proxytype_t proxytype;
  54 int autoconnect;
  55
  56 char *scriptinterpreter;
  57 char *scriptextension;
  58
  59 bool node_read_ecdsa_public_key(node_t *n) {
  60         if(ecdsa_active(&n->ecdsa))
  61                 return true;
  62
  63         splay_tree_t *config_tree;
  64         FILE *fp;
  65         char *pubname = NULL, *hcfname = NULL;
  66         char *p;
  67         bool result = false;
  68
  69         xasprintf(&hcfname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  70
  71         init_configuration(&config_tree);
  72         if(!read_config_file(config_tree, hcfname))
  73                 goto exit;
  74
  75         /* First, check for simple ECDSAPublicKey statement */
  76
  77         if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
  78                 result = ecdsa_set_base64_public_key(&n->ecdsa, p);
  79                 free(p);
  80                 goto exit;
  81         }
  82
  83         /* Else, check for ECDSAPublicKeyFile statement and read it */
  84
  85         if(!get_config_string(lookup_config(config_tree, "ECDSAPublicKeyFile"), &pubname))
  86                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  87
  88         fp = fopen(pubname, "r");
  89
  90         if(!fp) {
  91                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s", pubname, strerror(errno));
  92                 goto exit;
  93         }
  94
  95         result = ecdsa_read_pem_public_key(&n->ecdsa, fp);
  96         fclose(fp);
  97
  98 exit:
  99         exit_configuration(&config_tree);
 100         free(hcfname);
 101         free(pubname);
 102         return result;
 103 }
 104
 105 bool read_ecdsa_public_key(connection_t *c) {
 106         FILE *fp;
 107         char *fname;
 108         char *p;
 109         bool result;
 110
 111         /* First, check for simple ECDSAPublicKey statement */
 112
 113         if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
 114                 result = ecdsa_set_base64_public_key(&c->ecdsa, p);
 115                 free(p);
 116                 return result;
 117         }
 118
 119         /* Else, check for ECDSAPublicKeyFile statement and read it */
 120
 121         if(!get_config_string(lookup_config(c->config_tree, "ECDSAPublicKeyFile"), &fname))
 122                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 123
 124         fp = fopen(fname, "r");
 125
 126         if(!fp) {
 127                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s",
 128                            fname, strerror(errno));
 129                 free(fname);
 130                 return false;
 131         }
 132
 133         result = ecdsa_read_pem_public_key(&c->ecdsa, fp);
 134         fclose(fp);
 135
 136         if(!result)
 137                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing ECDSA public key file `%s' failed.", fname);
 138         free(fname);
 139         return result;
 140 }
 141
 142 bool read_rsa_public_key(connection_t *c) {
 143         FILE *fp;
 144         char *fname;
 145         char *n;
 146         bool result;
 147
 148         /* First, check for simple PublicKey statement */
 149
 150         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 151                 result = rsa_set_hex_public_key(&c->rsa, n, "FFFF");
 152                 free(n);
 153                 return result;
 154         }
 155
 156         /* Else, check for PublicKeyFile statement and read it */
 157
 158         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 159                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 160
 161         fp = fopen(fname, "r");
 162
 163         if(!fp) {
 164                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 165                 free(fname);
 166                 return false;
 167         }
 168
 169         result = rsa_read_pem_public_key(&c->rsa, fp);
 170         fclose(fp);
 171
 172         if(!result)
 173                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 174         free(fname);
 175         return result;
 176 }
 177
 178 static bool read_ecdsa_private_key(void) {
 179         FILE *fp;
 180         char *fname;
 181         bool result;
 182
 183         /* Check for PrivateKeyFile statement and read it */
 184
 185         if(!get_config_string(lookup_config(config_tree, "ECDSAPrivateKeyFile"), &fname))
 186                 xasprintf(&fname, "%s" SLASH "ecdsa_key.priv", confbase);
 187
 188         fp = fopen(fname, "r");
 189
 190         if(!fp) {
 191                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA private key file `%s': %s", fname, strerror(errno));
 192                 free(fname);
 193                 return false;
 194         }
 195
 196 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 197         struct stat s;
 198
 199         if(fstat(fileno(fp), &s)) {
 200                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat ECDSA private key file `%s': %s'", fname, strerror(errno));
 201                 free(fname);
 202                 return false;
 203         }
 204
 205         if(s.st_mode & ~0100700)
 206                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for ECDSA private key file `%s'!", fname);
 207 #endif
 208
 209         result = ecdsa_read_pem_private_key(&myself->connection->ecdsa, fp);
 210         fclose(fp);
 211
 212         if(!result)
 213                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 214         free(fname);
 215         return result;
 216 }
 217
 218 static bool read_rsa_private_key(void) {
 219         FILE *fp;
 220         char *fname;
 221         char *n, *d;
 222         bool result;
 223
 224         /* First, check for simple PrivateKey statement */
 225
 226         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 227                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 228                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 229                         free(d);
 230                         return false;
 231                 }
 232                 result = rsa_set_hex_private_key(&myself->connection->rsa, n, "FFFF", d);
 233                 free(n);
 234                 free(d);
 235                 return result;
 236         }
 237
 238         /* Else, check for PrivateKeyFile statement and read it */
 239
 240         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 241                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 242
 243         fp = fopen(fname, "r");
 244
 245         if(!fp) {
 246                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 247                            fname, strerror(errno));
 248                 free(fname);
 249                 return false;
 250         }
 251
 252 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 253         struct stat s;
 254
 255         if(fstat(fileno(fp), &s)) {
 256                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 257                 free(fname);
 258                 return false;
 259         }
 260
 261         if(s.st_mode & ~0100700)
 262                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 263 #endif
 264
 265         result = rsa_read_pem_private_key(&myself->connection->rsa, fp);
 266         fclose(fp);
 267
 268         if(!result)
 269                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 270         free(fname);
 271         return result;
 272 }
 273
 274 static timeout_t keyexpire_timeout;
 275
 276 static void keyexpire_handler(void *data) {
 277         regenerate_key();
 278         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 279 }
 280
 281 void regenerate_key(void) {
 282         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 283         send_key_changed();
 284 }
 285
 286 /*
 287   Read Subnets from all host config files
 288 */
 289 void load_all_subnets(void) {
 290         DIR *dir;
 291         struct dirent *ent;
 292         char *dname;
 293
 294         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 295         dir = opendir(dname);
 296         if(!dir) {
 297                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 298                 free(dname);
 299                 return;
 300         }
 301
 302         while((ent = readdir(dir))) {
 303                 if(!check_id(ent->d_name))
 304                         continue;
 305
 306                 node_t *n = lookup_node(ent->d_name);
 307                 #ifdef _DIRENT_HAVE_D_TYPE
 308                 //if(ent->d_type != DT_REG)
 309                 //      continue;
 310                 #endif
 311
 312                 char *fname;
 313                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, ent->d_name);
 314
 315                 splay_tree_t *config_tree;
 316                 init_configuration(&config_tree);
 317                 read_config_options(config_tree, ent->d_name);
 318                 read_config_file(config_tree, fname);
 319                 free(fname);
 320
 321                 if(!n) {
 322                         n = new_node();
 323                         n->name = xstrdup(ent->d_name);
 324                         node_add(n);
 325                 }
 326
 327                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 328                         subnet_t *s, *s2;
 329
 330                         if(!get_config_subnet(cfg, &s))
 331                                 continue;
 332
 333                         if((s2 = lookup_subnet(n, s))) {
 334                                 s2->expires = -1;
 335                         } else {
 336                                 subnet_add(n, s);
 337                         }
 338                 }
 339
 340                 exit_configuration(&config_tree);
 341         }
 342
 343         closedir(dir);
 344 }
 345
 346 void load_all_nodes(void) {
 347         DIR *dir;
 348         struct dirent *ent;
 349         char *dname;
 350
 351         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 352         dir = opendir(dname);
 353         if(!dir) {
 354                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 355                 free(dname);
 356                 return;
 357         }
 358
 359         while((ent = readdir(dir))) {
 360                 if(!check_id(ent->d_name))
 361                         continue;
 362
 363                 node_t *n = lookup_node(ent->d_name);
 364                 if(n)
 365                         continue;
 366
 367                 n = new_node();
 368                 n->name = xstrdup(ent->d_name);
 369                 node_add(n);
 370         }
 371
 372         closedir(dir);
 373 }
 374
 375
 376 char *get_name(void) {
 377         char *name = NULL;
 378
 379         get_config_string(lookup_config(config_tree, "Name"), &name);
 380
 381         if(!name)
 382                 return NULL;
 383
 384         if(*name == '$') {
 385                 char *envname = getenv(name + 1);
 386                 if(!envname) {
 387                         if(strcmp(name + 1, "HOST")) {
 388                                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1);
 389                                 return false;
 390                         }
 391                         char envname[32];
 392                         if(gethostname(envname, 32)) {
 393                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", strerror(errno));
 394                                 return false;
 395                         }
 396                         envname[31] = 0;
 397                 }
 398                 free(name);
 399                 name = xstrdup(envname);
 400                 for(char *c = name; *c; c++)
 401                         if(!isalnum(*c))
 402                                 *c = '_';
 403         }
 404
 405         if(!check_id(name)) {
 406                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
 407                 free(name);
 408                 return false;
 409         }
 410
 411         return name;
 412 }
 413
 414 bool setup_myself_reloadable(void) {
 415         char *proxy = NULL;
 416         char *rmode = NULL;
 417         char *fmode = NULL;
 418         char *bmode = NULL;
 419         char *afname = NULL;
 420         char *space;
 421         bool choice;
 422
 423         free(scriptinterpreter);
 424         scriptinterpreter = NULL;
 425         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 426
 427
 428         free(scriptextension);
 429         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 430 #ifdef HAVE_MINGW
 431                 scriptextension = xstrdup(".bat");
 432 #else
 433                 scriptextension = xstrdup("");
 434 #endif
 435
 436         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 437         if(proxy) {
 438                 if((space = strchr(proxy, ' ')))
 439                         *space++ = 0;
 440
 441                 if(!strcasecmp(proxy, "none")) {
 442                         proxytype = PROXY_NONE;
 443                 } else if(!strcasecmp(proxy, "socks4")) {
 444                         proxytype = PROXY_SOCKS4;
 445                 } else if(!strcasecmp(proxy, "socks4a")) {
 446                         proxytype = PROXY_SOCKS4A;
 447                 } else if(!strcasecmp(proxy, "socks5")) {
 448                         proxytype = PROXY_SOCKS5;
 449                 } else if(!strcasecmp(proxy, "http")) {
 450                         proxytype = PROXY_HTTP;
 451                 } else if(!strcasecmp(proxy, "exec")) {
 452                         proxytype = PROXY_EXEC;
 453                 } else {
 454                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 455                         return false;
 456                 }
 457
 458                 switch(proxytype) {
 459                         case PROXY_NONE:
 460                         default:
 461                                 break;
 462
 463                         case PROXY_EXEC:
 464                                 if(!space || !*space) {
 465                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 466                                         return false;
 467                                 }
 468                                 proxyhost =  xstrdup(space);
 469                                 break;
 470
 471                         case PROXY_SOCKS4:
 472                         case PROXY_SOCKS4A:
 473                         case PROXY_SOCKS5:
 474                         case PROXY_HTTP:
 475                                 proxyhost = space;
 476                                 if(space && (space = strchr(space, ' ')))
 477                                         *space++ = 0, proxyport = space;
 478                                 if(space && (space = strchr(space, ' ')))
 479                                         *space++ = 0, proxyuser = space;
 480                                 if(space && (space = strchr(space, ' ')))
 481                                         *space++ = 0, proxypass = space;
 482                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 483                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 484                                         return false;
 485                                 }
 486                                 proxyhost = xstrdup(proxyhost);
 487                                 proxyport = xstrdup(proxyport);
 488                                 if(proxyuser && *proxyuser)
 489                                         proxyuser = xstrdup(proxyuser);
 490                                 if(proxypass && *proxypass)
 491                                         proxypass = xstrdup(proxypass);
 492                                 break;
 493                 }
 494
 495                 free(proxy);
 496         }
 497
 498         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 499                 myself->options |= OPTION_INDIRECT;
 500
 501         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 502                 myself->options |= OPTION_TCPONLY;
 503
 504         if(myself->options & OPTION_TCPONLY)
 505                 myself->options |= OPTION_INDIRECT;
 506
 507         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 508         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 509
 510         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 511                 if(!strcasecmp(rmode, "router"))
 512                         routing_mode = RMODE_ROUTER;
 513                 else if(!strcasecmp(rmode, "switch"))
 514                         routing_mode = RMODE_SWITCH;
 515                 else if(!strcasecmp(rmode, "hub"))
 516                         routing_mode = RMODE_HUB;
 517                 else {
 518                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 519                         return false;
 520                 }
 521                 free(rmode);
 522         }
 523
 524         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 525                 if(!strcasecmp(fmode, "off"))
 526                         forwarding_mode = FMODE_OFF;
 527                 else if(!strcasecmp(fmode, "internal"))
 528                         forwarding_mode = FMODE_INTERNAL;
 529                 else if(!strcasecmp(fmode, "kernel"))
 530                         forwarding_mode = FMODE_KERNEL;
 531                 else {
 532                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 533                         return false;
 534                 }
 535                 free(fmode);
 536         }
 537
 538         choice = true;
 539         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 540         if(choice)
 541                 myself->options |= OPTION_PMTU_DISCOVERY;
 542
 543         choice = true;
 544         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 545         if(choice)
 546                 myself->options |= OPTION_CLAMP_MSS;
 547
 548         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 549         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 550         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 551                 if(!strcasecmp(bmode, "no"))
 552                         broadcast_mode = BMODE_NONE;
 553                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 554                         broadcast_mode = BMODE_MST;
 555                 else if(!strcasecmp(bmode, "direct"))
 556                         broadcast_mode = BMODE_DIRECT;
 557                 else {
 558                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 559                         return false;
 560                 }
 561                 free(bmode);
 562         }
 563
 564 #if !defined(SOL_IP) || !defined(IP_TOS)
 565         if(priorityinheritance)
 566                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 567 #endif
 568
 569         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 570                 macexpire = 600;
 571
 572         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 573                 if(maxtimeout <= 0) {
 574                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 575                         return false;
 576                 }
 577         } else
 578                 maxtimeout = 900;
 579
 580         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 581                 if(!strcasecmp(afname, "IPv4"))
 582                         addressfamily = AF_INET;
 583                 else if(!strcasecmp(afname, "IPv6"))
 584                         addressfamily = AF_INET6;
 585                 else if(!strcasecmp(afname, "any"))
 586                         addressfamily = AF_UNSPEC;
 587                 else {
 588                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 589                         return false;
 590                 }
 591                 free(afname);
 592         }
 593
 594         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 595
 596         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 597                 keylifetime = 3600;
 598
 599         get_config_int(lookup_config(config_tree, "AutoConnect"), &autoconnect);
 600
 601         return true;
 602 }
 603
 604 /*
 605   Configure node_t myself and set up the local sockets (listen only)
 606 */
 607 static bool setup_myself(void) {
 608         char *name, *hostname, *cipher, *digest, *type;
 609         char *fname = NULL;
 610         char *address = NULL;
 611
 612         if(!(name = get_name())) {
 613                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 614                 return false;
 615         }
 616
 617         myself = new_node();
 618         myself->connection = new_connection();
 619         myself->name = name;
 620         myself->connection->name = xstrdup(name);
 621         xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 622         read_config_options(config_tree, name);
 623         read_config_file(config_tree, fname);
 624         free(fname);
 625
 626         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 627                 myport = xstrdup("655");
 628
 629         xasprintf(&myself->hostname, "MYSELF port %s", myport);
 630         myself->connection->hostname = xstrdup(myself->hostname);
 631
 632         myself->connection->options = 0;
 633         myself->connection->protocol_major = PROT_MAJOR;
 634         myself->connection->protocol_minor = PROT_MINOR;
 635
 636         myself->options |= PROT_MINOR << 24;
 637
 638         get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental);
 639
 640         if(experimental && !read_ecdsa_private_key())
 641                 return false;
 642
 643         if(!read_rsa_private_key())
 644                 return false;
 645
 646         if(!atoi(myport)) {
 647                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 648                 sockaddr_t sa;
 649                 if(!ai || !ai->ai_addr)
 650                         return false;
 651                 free(myport);
 652                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 653                 sockaddr2str(&sa, NULL, &myport);
 654         }
 655
 656         /* Read in all the subnets specified in the host configuration file */
 657
 658         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 659                 subnet_t *subnet;
 660
 661                 if(!get_config_subnet(cfg, &subnet))
 662                         return false;
 663
 664                 subnet_add(myself, subnet);
 665         }
 666
 667         /* Check some options */
 668
 669         if(!setup_myself_reloadable())
 670                 return false;
 671
 672         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 673         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 674         strictsubnets |= tunnelserver;
 675
 676
 677
 678         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 679                 if(udp_rcvbuf <= 0) {
 680                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 681                         return false;
 682                 }
 683         }
 684
 685         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 686                 if(udp_sndbuf <= 0) {
 687                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 688                         return false;
 689                 }
 690         }
 691
 692         int replaywin_int;
 693         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 694                 if(replaywin_int < 0) {
 695                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 696                         return false;
 697                 }
 698                 replaywin = (unsigned)replaywin_int;
 699                 sptps_replaywin = replaywin;
 700         }
 701
 702         /* Generate packet encryption key */
 703
 704         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 705                 cipher = xstrdup("blowfish");
 706
 707         if(!cipher_open_by_name(&myself->incipher, cipher)) {
 708                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 709                 return false;
 710         }
 711
 712         free(cipher);
 713
 714         send_key_changed();
 715         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 716
 717         /* Check if we want to use message authentication codes... */
 718
 719         int maclength = 4;
 720         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 721
 722         if(maclength < 0) {
 723                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 724                 return false;
 725         }
 726
 727         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 728                 digest = xstrdup("sha1");
 729
 730         if(!digest_open_by_name(&myself->indigest, digest, maclength)) {
 731                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 732                 return false;
 733         }
 734
 735         free(digest);
 736
 737         /* Compression */
 738
 739         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 740                 if(myself->incompression < 0 || myself->incompression > 11) {
 741                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 742                         return false;
 743                 }
 744         } else
 745                 myself->incompression = 0;
 746
 747         myself->connection->outcompression = 0;
 748
 749         /* Done */
 750
 751         myself->nexthop = myself;
 752         myself->via = myself;
 753         myself->status.reachable = true;
 754         myself->last_state_change = time(NULL);
 755         myself->status.sptps = experimental;
 756         node_add(myself);
 757
 758         graph();
 759
 760         if(strictsubnets)
 761                 load_all_subnets();
 762         else if(autoconnect)
 763                 load_all_nodes();
 764
 765         /* Open device */
 766
 767         devops = os_devops;
 768
 769         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 770                 if(!strcasecmp(type, "dummy"))
 771                         devops = dummy_devops;
 772                 else if(!strcasecmp(type, "raw_socket"))
 773                         devops = raw_socket_devops;
 774                 else if(!strcasecmp(type, "multicast"))
 775                         devops = multicast_devops;
 776 #ifdef ENABLE_UML
 777                 else if(!strcasecmp(type, "uml"))
 778                         devops = uml_devops;
 779 #endif
 780 #ifdef ENABLE_VDE
 781                 else if(!strcasecmp(type, "vde"))
 782                         devops = vde_devops;
 783 #endif
 784         }
 785
 786         if(!devops.setup())
 787                 return false;
 788
 789         if(device_fd >= 0)
 790                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 791
 792         /* Run tinc-up script to further initialize the tap interface */
 793         char *envp[5];
 794         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 795         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 796         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 797         xasprintf(&envp[3], "NAME=%s", myself->name);
 798         envp[4] = NULL;
 799
 800         execute_script("tinc-up", envp);
 801
 802         for(int i = 0; i < 4; i++)
 803                 free(envp[i]);
 804
 805         /* Run subnet-up scripts for our own subnets */
 806
 807         subnet_update(myself, NULL, true);
 808
 809         /* Open sockets */
 810
 811 #ifndef HAVE_MINGW
 812         int unix_fd = socket(AF_UNIX, SOCK_STREAM, 0);
 813         if(unix_fd < 0) {
 814                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not create UNIX socket: %s", sockstrerror(errno));
 815                 return false;
 816         }
 817
 818         struct sockaddr_un sa;
 819         sa.sun_family = AF_UNIX;
 820         strncpy(sa.sun_path, unixsocketname, sizeof sa.sun_path);
 821
 822         if(connect(unix_fd, (struct sockaddr *)&sa, sizeof sa) >= 0) {
 823                 logger(DEBUG_ALWAYS, LOG_ERR, "UNIX socket %s is still in use!", unixsocketname);
 824                 return false;
 825         }
 826
 827         unlink(unixsocketname);
 828
 829         if(bind(unix_fd, (struct sockaddr *)&sa, sizeof sa) < 0) {
 830                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not bind UNIX socket to %s: %s", unixsocketname, sockstrerror(errno));
 831                 return false;
 832         }
 833
 834         if(listen(unix_fd, 3) < 0) {
 835                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not listen on UNIX socket %s: %s", unixsocketname, sockstrerror(errno));
 836                 return false;
 837         }
 838
 839         io_add(&unix_socket, handle_new_unix_connection, &unix_socket, unix_fd, IO_READ);
 840 #endif
 841
 842         if(!do_detach && getenv("LISTEN_FDS")) {
 843                 sockaddr_t sa;
 844                 socklen_t salen;
 845
 846                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 847 #ifdef HAVE_UNSETENV
 848                 unsetenv("LISTEN_FDS");
 849 #endif
 850
 851                 if(listen_sockets > MAXSOCKETS) {
 852                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 853                         return false;
 854                 }
 855
 856                 for(int i = 0; i < listen_sockets; i++) {
 857                         salen = sizeof sa;
 858                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 859                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
 860                                 return false;
 861                         }
 862
 863 #ifdef FD_CLOEXEC
 864                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 865 #endif
 866
 867                         int udp_fd = setup_vpn_in_socket(&sa);
 868                         if(udp_fd < 0)
 869                                 return false;
 870
 871                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
 872                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
 873
 874                         if(debug_level >= DEBUG_CONNECTIONS) {
 875                                 hostname = sockaddr2hostname(&sa);
 876                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 877                                 free(hostname);
 878                         }
 879
 880                         memcpy(&listen_socket[i].sa, &sa, salen);
 881                 }
 882         } else {
 883                 listen_sockets = 0;
 884                 config_t *cfg = lookup_config(config_tree, "BindToAddress");
 885
 886                 do {
 887                         get_config_string(cfg, &address);
 888                         if(cfg)
 889                                 cfg = lookup_config_next(config_tree, cfg);
 890
 891                         char *port = myport;
 892
 893                         if(address) {
 894                                 char *space = strchr(address, ' ');
 895                                 if(space) {
 896                                         *space++ = 0;
 897                                         port = space;
 898                                 }
 899
 900                                 if(!strcmp(address, "*"))
 901                                         *address = 0;
 902                         }
 903
 904                         struct addrinfo *ai, hint = {0};
 905                         hint.ai_family = addressfamily;
 906                         hint.ai_socktype = SOCK_STREAM;
 907                         hint.ai_protocol = IPPROTO_TCP;
 908                         hint.ai_flags = AI_PASSIVE;
 909
 910                         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 911                         free(address);
 912
 913                         if(err || !ai) {
 914                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
 915                                            gai_strerror(err));
 916                                 return false;
 917                         }
 918
 919                         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 920                                 if(listen_sockets >= MAXSOCKETS) {
 921                                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 922                                         return false;
 923                                 }
 924
 925                                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 926
 927                                 if(tcp_fd < 0)
 928                                         continue;
 929
 930                                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 931
 932                                 if(tcp_fd < 0) {
 933                                         close(tcp_fd);
 934                                         continue;
 935                                 }
 936
 937                                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 938                                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 939
 940                                 if(debug_level >= DEBUG_CONNECTIONS) {
 941                                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 942                                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 943                                         free(hostname);
 944                                 }
 945
 946                                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 947                                 listen_sockets++;
 948                         }
 949
 950                         freeaddrinfo(ai);
 951                 } while(cfg);
 952         }
 953
 954         if(listen_sockets)
 955                 logger(DEBUG_ALWAYS, LOG_NOTICE, "Ready");
 956         else {
 957                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
 958                 return false;
 959         }
 960
 961         last_config_check = time(NULL);
 962
 963         return true;
 964 }
 965
 966 /*
 967   initialize network
 968 */
 969 bool setup_network(void) {
 970         init_connections();
 971         init_subnets();
 972         init_nodes();
 973         init_edges();
 974         init_requests();
 975
 976         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 977                 if(pinginterval < 1) {
 978                         pinginterval = 86400;
 979                 }
 980         } else
 981                 pinginterval = 60;
 982
 983         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 984                 pingtimeout = 5;
 985         if(pingtimeout < 1 || pingtimeout > pinginterval)
 986                 pingtimeout = pinginterval;
 987
 988         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 989                 maxoutbufsize = 10 * MTU;
 990
 991         if(!setup_myself())
 992                 return false;
 993
 994         return true;
 995 }
 996
 997 /*
 998   close all open network connections
 999 */
1000 void close_network_connections(void) {
1001         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1002                 next = node->next;
1003                 connection_t *c = node->data;
1004                 /* Keep control connections open until the end, so they know when we really terminated */
1005                 if(c->status.control)
1006                         c->socket = -1;
1007                 c->outgoing = NULL;
1008                 terminate_connection(c, false);
1009         }
1010
1011         list_delete_list(outgoing_list);
1012
1013         if(myself && myself->connection) {
1014                 subnet_update(myself, NULL, false);
1015                 terminate_connection(myself->connection, false);
1016                 free_connection(myself->connection);
1017         }
1018
1019         for(int i = 0; i < listen_sockets; i++) {
1020                 io_del(&listen_socket[i].tcp);
1021                 io_del(&listen_socket[i].udp);
1022                 close(listen_socket[i].tcp.fd);
1023                 close(listen_socket[i].udp.fd);
1024         }
1025
1026 #ifndef HAVE_MINGW
1027         io_del(&unix_socket);
1028         close(unix_socket.fd);
1029 #endif
1030
1031         char *envp[5];
1032         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
1033         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
1034         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
1035         xasprintf(&envp[3], "NAME=%s", myself->name);
1036         envp[4] = NULL;
1037
1038         exit_requests();
1039         exit_edges();
1040         exit_subnets();
1041         exit_nodes();
1042         exit_connections();
1043
1044         execute_script("tinc-down", envp);
1045
1046         if(myport) free(myport);
1047
1048         for(int i = 0; i < 4; i++)
1049                 free(envp[i]);
1050
1051         devops.close();
1052
1053         return;
1054 }