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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2014 Guus Sliepen <guus@tinc-vpn.org>
   5                   2006      Scott Lamb <slamb@slamb.org>
   6                   2010      Brandon Black <blblack@gmail.com>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License along
  19     with this program; if not, write to the Free Software Foundation, Inc.,
  20     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21 */
  22
  23 #include "system.h"
  24
  25 #include "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 "script.h"
  42 #include "subnet.h"
  43 #include "utils.h"
  44 #include "xalloc.h"
  45
  46 char *myport;
  47 static io_t device_io;
  48 devops_t devops;
  49 bool device_standby = false;
  50
  51 char *proxyhost;
  52 char *proxyport;
  53 char *proxyuser;
  54 char *proxypass;
  55 proxytype_t proxytype;
  56 bool autoconnect;
  57 bool disablebuggypeers;
  58
  59 char *scriptinterpreter;
  60 char *scriptextension;
  61
  62 bool node_read_ecdsa_public_key(node_t *n) {
  63         if(ecdsa_active(n->ecdsa))
  64                 return true;
  65
  66         splay_tree_t *config_tree;
  67         FILE *fp;
  68         char *pubname = NULL;
  69         char *p;
  70
  71         init_configuration(&config_tree);
  72         if(!read_host_config(config_tree, n->name))
  73                 goto exit;
  74
  75         /* First, check for simple Ed25519PublicKey statement */
  76
  77         if(get_config_string(lookup_config(config_tree, "Ed25519PublicKey"), &p)) {
  78                 n->ecdsa = ecdsa_set_base64_public_key(p);
  79                 free(p);
  80                 goto exit;
  81         }
  82
  83         /* Else, check for Ed25519PublicKeyFile statement and read it */
  84
  85         if(!get_config_string(lookup_config(config_tree, "Ed25519PublicKeyFile"), &pubname))
  86                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  87
  88         fp = fopen(pubname, "r");
  89
  90         if(!fp)
  91                 goto exit;
  92
  93         n->ecdsa = ecdsa_read_pem_public_key(fp);
  94         fclose(fp);
  95
  96 exit:
  97         exit_configuration(&config_tree);
  98         free(pubname);
  99         return n->ecdsa;
 100 }
 101
 102 bool read_ecdsa_public_key(connection_t *c) {
 103         if(ecdsa_active(c->ecdsa))
 104                 return true;
 105
 106         FILE *fp;
 107         char *fname;
 108         char *p;
 109
 110         if(!c->config_tree) {
 111                 init_configuration(&c->config_tree);
 112                 if(!read_host_config(c->config_tree, c->name))
 113                         return false;
 114         }
 115
 116         /* First, check for simple Ed25519PublicKey statement */
 117
 118         if(get_config_string(lookup_config(c->config_tree, "Ed25519PublicKey"), &p)) {
 119                 c->ecdsa = ecdsa_set_base64_public_key(p);
 120                 free(p);
 121                 return c->ecdsa;
 122         }
 123
 124         /* Else, check for Ed25519PublicKeyFile statement and read it */
 125
 126         if(!get_config_string(lookup_config(c->config_tree, "Ed25519PublicKeyFile"), &fname))
 127                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 128
 129         fp = fopen(fname, "r");
 130
 131         if(!fp) {
 132                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 public key file `%s': %s",
 133                            fname, strerror(errno));
 134                 free(fname);
 135                 return false;
 136         }
 137
 138         c->ecdsa = ecdsa_read_pem_public_key(fp);
 139         fclose(fp);
 140
 141         if(!c->ecdsa)
 142                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing Ed25519 public key file `%s' failed.", fname);
 143         free(fname);
 144         return c->ecdsa;
 145 }
 146
 147 bool read_rsa_public_key(connection_t *c) {
 148         if(ecdsa_active(c->ecdsa))
 149                 return true;
 150
 151         FILE *fp;
 152         char *fname;
 153         char *n;
 154
 155         /* First, check for simple PublicKey statement */
 156
 157         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 158                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 159                 free(n);
 160                 return c->rsa;
 161         }
 162
 163         /* Else, check for PublicKeyFile statement and read it */
 164
 165         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 166                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 167
 168         fp = fopen(fname, "r");
 169
 170         if(!fp) {
 171                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 172                 free(fname);
 173                 return false;
 174         }
 175
 176         c->rsa = rsa_read_pem_public_key(fp);
 177         fclose(fp);
 178
 179         if(!c->rsa)
 180                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 181         free(fname);
 182         return c->rsa;
 183 }
 184
 185 static bool read_ecdsa_private_key(void) {
 186         FILE *fp;
 187         char *fname;
 188
 189         /* Check for PrivateKeyFile statement and read it */
 190
 191         if(!get_config_string(lookup_config(config_tree, "Ed25519PrivateKeyFile"), &fname))
 192                 xasprintf(&fname, "%s" SLASH "ed25519_key.priv", confbase);
 193
 194         fp = fopen(fname, "r");
 195
 196         if(!fp) {
 197                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 private key file `%s': %s", fname, strerror(errno));
 198                 if(errno == ENOENT)
 199                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an Ed25519 keypair with `tinc -n %s generate-ed25519-keys'.", netname ?: ".");
 200                 free(fname);
 201                 return false;
 202         }
 203
 204 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 205         struct stat s;
 206
 207         if(fstat(fileno(fp), &s)) {
 208                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat Ed25519 private key file `%s': %s'", fname, strerror(errno));
 209                 free(fname);
 210                 return false;
 211         }
 212
 213         if(s.st_mode & ~0100700)
 214                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for Ed25519 private key file `%s'!", fname);
 215 #endif
 216
 217         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 218         fclose(fp);
 219
 220         if(!myself->connection->ecdsa)
 221                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 222         free(fname);
 223         return myself->connection->ecdsa;
 224 }
 225
 226 static bool read_invitation_key(void) {
 227         FILE *fp;
 228         char *fname;
 229
 230         if(invitation_key) {
 231                 ecdsa_free(invitation_key);
 232                 invitation_key = NULL;
 233         }
 234
 235         xasprintf(&fname, "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
 236
 237         fp = fopen(fname, "r");
 238
 239         if(fp) {
 240                 invitation_key = ecdsa_read_pem_private_key(fp);
 241                 fclose(fp);
 242                 if(!invitation_key)
 243                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 244         }
 245
 246         free(fname);
 247         return invitation_key;
 248 }
 249
 250 static bool read_rsa_private_key(void) {
 251         FILE *fp;
 252         char *fname;
 253         char *n, *d;
 254
 255         /* First, check for simple PrivateKey statement */
 256
 257         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 258                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 259                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 260                         free(d);
 261                         return false;
 262                 }
 263                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 264                 free(n);
 265                 free(d);
 266                 return myself->connection->rsa;
 267         }
 268
 269         /* Else, check for PrivateKeyFile statement and read it */
 270
 271         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 272                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 273
 274         fp = fopen(fname, "r");
 275
 276         if(!fp) {
 277                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 278                            fname, strerror(errno));
 279                 free(fname);
 280                 return false;
 281         }
 282
 283 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 284         struct stat s;
 285
 286         if(fstat(fileno(fp), &s)) {
 287                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 288                 free(fname);
 289                 return false;
 290         }
 291
 292         if(s.st_mode & ~0100700)
 293                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 294 #endif
 295
 296         myself->connection->rsa = rsa_read_pem_private_key(fp);
 297         fclose(fp);
 298
 299         if(!myself->connection->rsa)
 300                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 301         free(fname);
 302         return myself->connection->rsa;
 303 }
 304
 305 static timeout_t keyexpire_timeout;
 306
 307 static void keyexpire_handler(void *data) {
 308         regenerate_key();
 309         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 310 }
 311
 312 void regenerate_key(void) {
 313         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 314         send_key_changed();
 315 }
 316
 317 /*
 318   Read Subnets from all host config files
 319 */
 320 void load_all_subnets(void) {
 321         DIR *dir;
 322         struct dirent *ent;
 323         char *dname;
 324
 325         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 326         dir = opendir(dname);
 327         if(!dir) {
 328                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 329                 free(dname);
 330                 return;
 331         }
 332
 333         while((ent = readdir(dir))) {
 334                 if(!check_id(ent->d_name))
 335                         continue;
 336
 337                 node_t *n = lookup_node(ent->d_name);
 338                 #ifdef _DIRENT_HAVE_D_TYPE
 339                 //if(ent->d_type != DT_REG)
 340                 //      continue;
 341                 #endif
 342
 343                 splay_tree_t *config_tree;
 344                 init_configuration(&config_tree);
 345                 read_config_options(config_tree, ent->d_name);
 346                 read_host_config(config_tree, ent->d_name);
 347
 348                 if(!n) {
 349                         n = new_node();
 350                         n->name = xstrdup(ent->d_name);
 351                         node_add(n);
 352                 }
 353
 354                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 355                         subnet_t *s, *s2;
 356
 357                         if(!get_config_subnet(cfg, &s))
 358                                 continue;
 359
 360                         if((s2 = lookup_subnet(n, s))) {
 361                                 s2->expires = -1;
 362                         } else {
 363                                 subnet_add(n, s);
 364                         }
 365                 }
 366
 367                 exit_configuration(&config_tree);
 368         }
 369
 370         closedir(dir);
 371 }
 372
 373 void load_all_nodes(void) {
 374         DIR *dir;
 375         struct dirent *ent;
 376         char *dname;
 377
 378         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 379         dir = opendir(dname);
 380         if(!dir) {
 381                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 382                 free(dname);
 383                 return;
 384         }
 385
 386         while((ent = readdir(dir))) {
 387                 if(!check_id(ent->d_name))
 388                         continue;
 389
 390                 node_t *n = lookup_node(ent->d_name);
 391                 if(n)
 392                         continue;
 393
 394                 n = new_node();
 395                 n->name = xstrdup(ent->d_name);
 396                 node_add(n);
 397         }
 398
 399         closedir(dir);
 400 }
 401
 402
 403 char *get_name(void) {
 404         char *name = NULL;
 405         char *returned_name;
 406
 407         get_config_string(lookup_config(config_tree, "Name"), &name);
 408
 409         if(!name)
 410                 return NULL;
 411
 412         returned_name = replace_name(name);
 413         free(name);
 414         return returned_name;
 415 }
 416
 417 bool setup_myself_reloadable(void) {
 418         char *proxy = NULL;
 419         char *rmode = NULL;
 420         char *fmode = NULL;
 421         char *bmode = NULL;
 422         char *afname = NULL;
 423         char *space;
 424         bool choice;
 425
 426         free(scriptinterpreter);
 427         scriptinterpreter = NULL;
 428         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 429
 430
 431         free(scriptextension);
 432         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 433                 scriptextension = xstrdup("");
 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         const char* const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
 564         for (size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
 565                 subnet_t *s = new_subnet();
 566                 if (!str2net(s, DEFAULT_BROADCAST_SUBNETS[i]))
 567                         abort();
 568                 subnet_add(NULL, s);
 569         }
 570         for (config_t* cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 571                 subnet_t *s;
 572                 if (!get_config_subnet(cfg, &s))
 573                         continue;
 574                 subnet_add(NULL, s);
 575         }
 576
 577 #if !defined(SOL_IP) || !defined(IP_TOS)
 578         if(priorityinheritance)
 579                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 580 #endif
 581
 582         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 583                 macexpire = 600;
 584
 585         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 586                 if(maxtimeout <= 0) {
 587                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 588                         return false;
 589                 }
 590         } else
 591                 maxtimeout = 900;
 592
 593         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 594                 if(!strcasecmp(afname, "IPv4"))
 595                         addressfamily = AF_INET;
 596                 else if(!strcasecmp(afname, "IPv6"))
 597                         addressfamily = AF_INET6;
 598                 else if(!strcasecmp(afname, "any"))
 599                         addressfamily = AF_UNSPEC;
 600                 else {
 601                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 602                         return false;
 603                 }
 604                 free(afname);
 605         }
 606
 607         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 608
 609         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 610                 keylifetime = 3600;
 611
 612         config_t *cfg = lookup_config(config_tree, "AutoConnect");
 613         if(cfg) {
 614                 if(!get_config_bool(cfg, &autoconnect)) {
 615                         // Some backwards compatibility with when this option was an int
 616                         int val = 0;
 617                         get_config_int(cfg, &val);
 618                         autoconnect = val;
 619                 }
 620         }
 621
 622         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 623
 624         read_invitation_key();
 625
 626         return true;
 627 }
 628
 629 /*
 630   Add listening sockets.
 631 */
 632 static bool add_listen_address(char *address, bool bindto) {
 633         char *port = myport;
 634
 635         if(address) {
 636                 char *space = strchr(address, ' ');
 637                 if(space) {
 638                         *space++ = 0;
 639                         port = space;
 640                 }
 641
 642                 if(!strcmp(address, "*"))
 643                         *address = 0;
 644         }
 645
 646         struct addrinfo *ai, hint = {0};
 647         hint.ai_family = addressfamily;
 648         hint.ai_socktype = SOCK_STREAM;
 649         hint.ai_protocol = IPPROTO_TCP;
 650         hint.ai_flags = AI_PASSIVE;
 651
 652         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 653         free(address);
 654
 655         if(err || !ai) {
 656                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 657                 return false;
 658         }
 659
 660         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 661                 // Ignore duplicate addresses
 662                 bool found = false;
 663
 664                 for(int i = 0; i < listen_sockets; i++)
 665                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 666                                 found = true;
 667                                 break;
 668                         }
 669
 670                 if(found)
 671                         continue;
 672
 673                 if(listen_sockets >= MAXSOCKETS) {
 674                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 675                         return false;
 676                 }
 677
 678                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 679
 680                 if(tcp_fd < 0)
 681                         continue;
 682
 683                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 684
 685                 if(tcp_fd < 0) {
 686                         close(tcp_fd);
 687                         continue;
 688                 }
 689
 690                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 691                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 692
 693                 if(debug_level >= DEBUG_CONNECTIONS) {
 694                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 695                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 696                         free(hostname);
 697                 }
 698
 699                 listen_socket[listen_sockets].bindto = bindto;
 700                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 701                 listen_sockets++;
 702         }
 703
 704         freeaddrinfo(ai);
 705         return true;
 706 }
 707
 708 void device_enable(void) {
 709         if (devops.enable)
 710                 devops.enable();
 711
 712         /* Run tinc-up script to further initialize the tap interface */
 713
 714         char *envp[5] = {NULL};
 715         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 716         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 717         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 718         xasprintf(&envp[3], "NAME=%s", myself->name);
 719
 720         execute_script("tinc-up", envp);
 721
 722         for(int i = 0; i < 4; i++)
 723                 free(envp[i]);
 724 }
 725
 726 void device_disable(void) {
 727         char *envp[5] = {NULL};
 728         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 729         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 730         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 731         xasprintf(&envp[3], "NAME=%s", myself->name);
 732
 733         execute_script("tinc-down", envp);
 734
 735         for(int i = 0; i < 4; i++)
 736                 free(envp[i]);
 737
 738         if (devops.disable)
 739                 devops.disable();
 740 }
 741
 742 /*
 743   Configure node_t myself and set up the local sockets (listen only)
 744 */
 745 static bool setup_myself(void) {
 746         char *name, *hostname, *cipher, *digest, *type;
 747         char *address = NULL;
 748         bool port_specified = false;
 749
 750         if(!(name = get_name())) {
 751                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 752                 return false;
 753         }
 754
 755         myself = new_node();
 756         myself->connection = new_connection();
 757         myself->name = name;
 758         myself->connection->name = xstrdup(name);
 759         read_host_config(config_tree, name);
 760
 761         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 762                 myport = xstrdup("655");
 763         else
 764                 port_specified = true;
 765
 766         myself->connection->options = 0;
 767         myself->connection->protocol_major = PROT_MAJOR;
 768         myself->connection->protocol_minor = PROT_MINOR;
 769
 770         myself->options |= PROT_MINOR << 24;
 771
 772         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 773                 experimental = read_ecdsa_private_key();
 774                 if(!experimental)
 775                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 776         } else {
 777                 if(experimental && !read_ecdsa_private_key())
 778                         return false;
 779         }
 780
 781         if(!read_rsa_private_key())
 782                 return false;
 783
 784         /* Ensure myport is numeric */
 785
 786         if(!atoi(myport)) {
 787                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 788                 sockaddr_t sa;
 789                 if(!ai || !ai->ai_addr)
 790                         return false;
 791                 free(myport);
 792                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 793                 sockaddr2str(&sa, NULL, &myport);
 794         }
 795
 796         /* Read in all the subnets specified in the host configuration file */
 797
 798         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 799                 subnet_t *subnet;
 800
 801                 if(!get_config_subnet(cfg, &subnet))
 802                         return false;
 803
 804                 subnet_add(myself, subnet);
 805         }
 806
 807         /* Check some options */
 808
 809         if(!setup_myself_reloadable())
 810                 return false;
 811
 812         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 813         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 814         strictsubnets |= tunnelserver;
 815
 816         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 817                 if(max_connection_burst <= 0) {
 818                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 819                         return false;
 820                 }
 821         }
 822
 823         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 824                 if(udp_rcvbuf <= 0) {
 825                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 826                         return false;
 827                 }
 828         }
 829
 830         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 831                 if(udp_sndbuf <= 0) {
 832                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 833                         return false;
 834                 }
 835         }
 836
 837         int replaywin_int;
 838         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 839                 if(replaywin_int < 0) {
 840                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 841                         return false;
 842                 }
 843                 replaywin = (unsigned)replaywin_int;
 844                 sptps_replaywin = replaywin;
 845         }
 846
 847         /* Generate packet encryption key */
 848
 849         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 850                 cipher = xstrdup("blowfish");
 851
 852         if(!strcasecmp(cipher, "none")) {
 853                 myself->incipher = NULL;
 854         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 855                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 856                 return false;
 857         }
 858
 859         free(cipher);
 860
 861         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 862
 863         /* Check if we want to use message authentication codes... */
 864
 865         int maclength = 4;
 866         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 867
 868         if(maclength < 0) {
 869                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 870                 return false;
 871         }
 872
 873         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 874                 digest = xstrdup("sha1");
 875
 876         if(!strcasecmp(digest, "none")) {
 877                 myself->indigest = NULL;
 878         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 879                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 880                 return false;
 881         }
 882
 883         free(digest);
 884
 885         /* Compression */
 886
 887         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 888                 if(myself->incompression < 0 || myself->incompression > 11) {
 889                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 890                         return false;
 891                 }
 892         } else
 893                 myself->incompression = 0;
 894
 895         myself->connection->outcompression = 0;
 896
 897         /* Done */
 898
 899         myself->nexthop = myself;
 900         myself->via = myself;
 901         myself->status.reachable = true;
 902         myself->last_state_change = now.tv_sec;
 903         myself->status.sptps = experimental;
 904         node_add(myself);
 905
 906         graph();
 907
 908         if(strictsubnets)
 909                 load_all_subnets();
 910         else if(autoconnect)
 911                 load_all_nodes();
 912
 913         /* Open device */
 914
 915         devops = os_devops;
 916
 917         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 918                 if(!strcasecmp(type, "dummy"))
 919                         devops = dummy_devops;
 920                 else if(!strcasecmp(type, "raw_socket"))
 921                         devops = raw_socket_devops;
 922                 else if(!strcasecmp(type, "multicast"))
 923                         devops = multicast_devops;
 924 #ifdef ENABLE_UML
 925                 else if(!strcasecmp(type, "uml"))
 926                         devops = uml_devops;
 927 #endif
 928 #ifdef ENABLE_VDE
 929                 else if(!strcasecmp(type, "vde"))
 930                         devops = vde_devops;
 931 #endif
 932         }
 933
 934         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
 935
 936         if(!devops.setup())
 937                 return false;
 938
 939         if(device_fd >= 0)
 940                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 941
 942         /* Open sockets */
 943
 944         if(!do_detach && getenv("LISTEN_FDS")) {
 945                 sockaddr_t sa;
 946                 socklen_t salen;
 947
 948                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 949 #ifdef HAVE_UNSETENV
 950                 unsetenv("LISTEN_FDS");
 951 #endif
 952
 953                 if(listen_sockets > MAXSOCKETS) {
 954                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 955                         return false;
 956                 }
 957
 958                 for(int i = 0; i < listen_sockets; i++) {
 959                         salen = sizeof sa;
 960                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 961                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
 962                                 return false;
 963                         }
 964
 965 #ifdef FD_CLOEXEC
 966                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 967 #endif
 968
 969                         int udp_fd = setup_vpn_in_socket(&sa);
 970                         if(udp_fd < 0)
 971                                 return false;
 972
 973                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
 974                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
 975
 976                         if(debug_level >= DEBUG_CONNECTIONS) {
 977                                 hostname = sockaddr2hostname(&sa);
 978                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 979                                 free(hostname);
 980                         }
 981
 982                         memcpy(&listen_socket[i].sa, &sa, salen);
 983                 }
 984         } else {
 985                 listen_sockets = 0;
 986                 int cfgs = 0;
 987
 988                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 989                         cfgs++;
 990                         get_config_string(cfg, &address);
 991                         if(!add_listen_address(address, true))
 992                                 return false;
 993                 }
 994
 995                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 996                         cfgs++;
 997                         get_config_string(cfg, &address);
 998                         if(!add_listen_address(address, false))
 999                                 return false;
1000                 }
1001
1002                 if(!cfgs)
1003                         if(!add_listen_address(address, NULL))
1004                                 return false;
1005         }
1006
1007         if(!listen_sockets) {
1008                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1009                 return false;
1010         }
1011
1012         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1013
1014         if(!port_specified || atoi(myport) == 0) {
1015                 sockaddr_t sa;
1016                 socklen_t salen = sizeof sa;
1017                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1018                         free(myport);
1019                         sockaddr2str(&sa, NULL, &myport);
1020                         if(!myport)
1021                                 myport = xstrdup("655");
1022                 }
1023         }
1024
1025         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1026         myself->connection->hostname = xstrdup(myself->hostname);
1027
1028         /* Done. */
1029
1030         last_config_check = now.tv_sec;
1031
1032         return true;
1033 }
1034
1035 /*
1036   initialize network
1037 */
1038 bool setup_network(void) {
1039         init_connections();
1040         init_subnets();
1041         init_nodes();
1042         init_edges();
1043         init_requests();
1044
1045         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1046                 if(pinginterval < 1) {
1047                         pinginterval = 86400;
1048                 }
1049         } else
1050                 pinginterval = 60;
1051
1052         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
1053                 pingtimeout = 5;
1054         if(pingtimeout < 1 || pingtimeout > pinginterval)
1055                 pingtimeout = pinginterval;
1056
1057         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
1058                 maxoutbufsize = 10 * MTU;
1059
1060         if(!setup_myself())
1061                 return false;
1062
1063         if(!init_control())
1064                 return false;
1065
1066         if (!device_standby)
1067                 device_enable();
1068
1069         /* Run subnet-up scripts for our own subnets */
1070
1071         subnet_update(myself, NULL, true);
1072
1073         return true;
1074 }
1075
1076 /*
1077   close all open network connections
1078 */
1079 void close_network_connections(void) {
1080         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1081                 next = node->next;
1082                 connection_t *c = node->data;
1083                 /* Keep control connections open until the end, so they know when we really terminated */
1084                 if(c->status.control)
1085                         c->socket = -1;
1086                 c->outgoing = NULL;
1087                 terminate_connection(c, false);
1088         }
1089
1090         if(outgoing_list)
1091                 list_delete_list(outgoing_list);
1092
1093         if(myself && myself->connection) {
1094                 subnet_update(myself, NULL, false);
1095                 terminate_connection(myself->connection, false);
1096                 free_connection(myself->connection);
1097         }
1098
1099         for(int i = 0; i < listen_sockets; i++) {
1100                 io_del(&listen_socket[i].tcp);
1101                 io_del(&listen_socket[i].udp);
1102                 close(listen_socket[i].tcp.fd);
1103                 close(listen_socket[i].udp.fd);
1104         }
1105
1106         exit_requests();
1107         exit_edges();
1108         exit_subnets();
1109         exit_nodes();
1110         exit_connections();
1111
1112         if (!device_standby)
1113                 device_disable();
1114
1115         if(myport) free(myport);
1116
1117         if (device_fd >= 0)
1118                 io_del(&device_io);
1119         if (devops.close)
1120                 devops.close();
1121
1122         exit_control();
1123
1124         return;
1125 }