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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2015 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 #ifdef HAVE_MINIUPNPC
  47 #include "upnp.h"
  48 #endif
  49
  50 char *myport;
  51 static char *myname;
  52 static io_t device_io;
  53 devops_t devops;
  54 bool device_standby = false;
  55
  56 char *proxyhost;
  57 char *proxyport;
  58 char *proxyuser;
  59 char *proxypass;
  60 proxytype_t proxytype;
  61 bool autoconnect;
  62 bool disablebuggypeers;
  63
  64 char *scriptinterpreter;
  65 char *scriptextension;
  66
  67 bool node_read_ecdsa_public_key(node_t *n) {
  68         if(ecdsa_active(n->ecdsa))
  69                 return true;
  70
  71         splay_tree_t *config_tree;
  72         FILE *fp;
  73         char *pubname = NULL;
  74         char *p;
  75
  76         init_configuration(&config_tree);
  77         if(!read_host_config(config_tree, n->name))
  78                 goto exit;
  79
  80         /* First, check for simple Ed25519PublicKey statement */
  81
  82         if(get_config_string(lookup_config(config_tree, "Ed25519PublicKey"), &p)) {
  83                 n->ecdsa = ecdsa_set_base64_public_key(p);
  84                 free(p);
  85                 goto exit;
  86         }
  87
  88         /* Else, check for Ed25519PublicKeyFile statement and read it */
  89
  90         if(!get_config_string(lookup_config(config_tree, "Ed25519PublicKeyFile"), &pubname))
  91                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  92
  93         fp = fopen(pubname, "r");
  94
  95         if(!fp)
  96                 goto exit;
  97
  98         n->ecdsa = ecdsa_read_pem_public_key(fp);
  99         fclose(fp);
 100
 101 exit:
 102         exit_configuration(&config_tree);
 103         free(pubname);
 104         return n->ecdsa;
 105 }
 106
 107 bool read_ecdsa_public_key(connection_t *c) {
 108         if(ecdsa_active(c->ecdsa))
 109                 return true;
 110
 111         FILE *fp;
 112         char *fname;
 113         char *p;
 114
 115         if(!c->config_tree) {
 116                 init_configuration(&c->config_tree);
 117                 if(!read_host_config(c->config_tree, c->name))
 118                         return false;
 119         }
 120
 121         /* First, check for simple Ed25519PublicKey statement */
 122
 123         if(get_config_string(lookup_config(c->config_tree, "Ed25519PublicKey"), &p)) {
 124                 c->ecdsa = ecdsa_set_base64_public_key(p);
 125                 free(p);
 126                 return c->ecdsa;
 127         }
 128
 129         /* Else, check for Ed25519PublicKeyFile statement and read it */
 130
 131         if(!get_config_string(lookup_config(c->config_tree, "Ed25519PublicKeyFile"), &fname))
 132                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 133
 134         fp = fopen(fname, "r");
 135
 136         if(!fp) {
 137                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 public key file `%s': %s",
 138                            fname, strerror(errno));
 139                 free(fname);
 140                 return false;
 141         }
 142
 143         c->ecdsa = ecdsa_read_pem_public_key(fp);
 144
 145         if(!c->ecdsa && errno != ENOENT)
 146                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing Ed25519 public key file `%s' failed.", fname);
 147
 148         fclose(fp);
 149         free(fname);
 150         return c->ecdsa;
 151 }
 152
 153 #ifndef DISABLE_LEGACY
 154 bool read_rsa_public_key(connection_t *c) {
 155         FILE *fp;
 156         char *fname;
 157         char *n;
 158
 159         /* First, check for simple PublicKey statement */
 160
 161         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 162                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 163                 free(n);
 164                 return c->rsa;
 165         }
 166
 167         /* Else, check for PublicKeyFile statement and read it */
 168
 169         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 170                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 171
 172         fp = fopen(fname, "r");
 173
 174         if(!fp) {
 175                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 176                 free(fname);
 177                 return false;
 178         }
 179
 180         c->rsa = rsa_read_pem_public_key(fp);
 181         fclose(fp);
 182
 183         if(!c->rsa)
 184                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 185         free(fname);
 186         return c->rsa;
 187 }
 188 #endif
 189
 190 static bool read_ecdsa_private_key(void) {
 191         FILE *fp;
 192         char *fname;
 193
 194         /* Check for PrivateKeyFile statement and read it */
 195
 196         if(!get_config_string(lookup_config(config_tree, "Ed25519PrivateKeyFile"), &fname))
 197                 xasprintf(&fname, "%s" SLASH "ed25519_key.priv", confbase);
 198
 199         fp = fopen(fname, "r");
 200
 201         if(!fp) {
 202                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 private key file `%s': %s", fname, strerror(errno));
 203                 if(errno == ENOENT)
 204                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an Ed25519 keypair with `tinc -n %s generate-ed25519-keys'.", netname ?: ".");
 205                 free(fname);
 206                 return false;
 207         }
 208
 209 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 210         struct stat s;
 211
 212         if(fstat(fileno(fp), &s)) {
 213                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat Ed25519 private key file `%s': %s'", fname, strerror(errno));
 214                 free(fname);
 215                 return false;
 216         }
 217
 218         if(s.st_mode & ~0100700)
 219                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for Ed25519 private key file `%s'!", fname);
 220 #endif
 221
 222         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 223         fclose(fp);
 224
 225         if(!myself->connection->ecdsa)
 226                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 227         free(fname);
 228         return myself->connection->ecdsa;
 229 }
 230
 231 static bool read_invitation_key(void) {
 232         FILE *fp;
 233         char fname[PATH_MAX];
 234
 235         if(invitation_key) {
 236                 ecdsa_free(invitation_key);
 237                 invitation_key = NULL;
 238         }
 239
 240         snprintf(fname, sizeof fname, "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
 241
 242         fp = fopen(fname, "r");
 243
 244         if(fp) {
 245                 invitation_key = ecdsa_read_pem_private_key(fp);
 246                 fclose(fp);
 247                 if(!invitation_key)
 248                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 249         }
 250
 251         return invitation_key;
 252 }
 253
 254 #ifndef DISABLE_LEGACY
 255 static bool read_rsa_private_key(void) {
 256         FILE *fp;
 257         char *fname;
 258         char *n, *d;
 259
 260         /* First, check for simple PrivateKey statement */
 261
 262         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 263                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 264                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 265                         free(d);
 266                         return false;
 267                 }
 268                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 269                 free(n);
 270                 free(d);
 271                 return myself->connection->rsa;
 272         }
 273
 274         /* Else, check for PrivateKeyFile statement and read it */
 275
 276         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 277                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 278
 279         fp = fopen(fname, "r");
 280
 281         if(!fp) {
 282                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 283                            fname, strerror(errno));
 284                 if(errno == ENOENT)
 285                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an RSA keypair with `tinc -n %s generate-rsa-keys'.", netname ?: ".");
 286                 free(fname);
 287                 return false;
 288         }
 289
 290 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 291         struct stat s;
 292
 293         if(fstat(fileno(fp), &s)) {
 294                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 295                 free(fname);
 296                 return false;
 297         }
 298
 299         if(s.st_mode & ~0100700)
 300                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 301 #endif
 302
 303         myself->connection->rsa = rsa_read_pem_private_key(fp);
 304         fclose(fp);
 305
 306         if(!myself->connection->rsa)
 307                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 308         free(fname);
 309         return myself->connection->rsa;
 310 }
 311 #endif
 312
 313 static timeout_t keyexpire_timeout;
 314
 315 static void keyexpire_handler(void *data) {
 316         regenerate_key();
 317         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 318 }
 319
 320 void regenerate_key(void) {
 321         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 322         send_key_changed();
 323         for splay_each(node_t, n, node_tree)
 324                 n->status.validkey_in = false;
 325 }
 326
 327 /*
 328   Read Subnets from all host config files
 329 */
 330 void load_all_subnets(void) {
 331         DIR *dir;
 332         struct dirent *ent;
 333         char dname[PATH_MAX];
 334
 335         snprintf(dname, sizeof dname, "%s" SLASH "hosts", confbase);
 336         dir = opendir(dname);
 337         if(!dir) {
 338                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 339                 return;
 340         }
 341
 342         while((ent = readdir(dir))) {
 343                 if(!check_id(ent->d_name))
 344                         continue;
 345
 346                 node_t *n = lookup_node(ent->d_name);
 347                 #ifdef _DIRENT_HAVE_D_TYPE
 348                 //if(ent->d_type != DT_REG)
 349                 //      continue;
 350                 #endif
 351
 352                 splay_tree_t *config_tree;
 353                 init_configuration(&config_tree);
 354                 read_config_options(config_tree, ent->d_name);
 355                 read_host_config(config_tree, ent->d_name);
 356
 357                 if(!n) {
 358                         n = new_node();
 359                         n->name = xstrdup(ent->d_name);
 360                         node_add(n);
 361                 }
 362
 363                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 364                         subnet_t *s, *s2;
 365
 366                         if(!get_config_subnet(cfg, &s))
 367                                 continue;
 368
 369                         if((s2 = lookup_subnet(n, s))) {
 370                                 s2->expires = -1;
 371                                 free(s);
 372                         } else {
 373                                 subnet_add(n, s);
 374                         }
 375                 }
 376
 377                 exit_configuration(&config_tree);
 378         }
 379
 380         closedir(dir);
 381 }
 382
 383 void load_all_nodes(void) {
 384         DIR *dir;
 385         struct dirent *ent;
 386         char dname[PATH_MAX];
 387
 388         snprintf(dname, sizeof dname, "%s" SLASH "hosts", confbase);
 389         dir = opendir(dname);
 390         if(!dir) {
 391                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 392                 return;
 393         }
 394
 395         while((ent = readdir(dir))) {
 396                 if(!check_id(ent->d_name))
 397                         continue;
 398
 399                 node_t *n = lookup_node(ent->d_name);
 400                 if(n)
 401                         continue;
 402
 403                 n = new_node();
 404                 n->name = xstrdup(ent->d_name);
 405                 node_add(n);
 406         }
 407
 408         closedir(dir);
 409 }
 410
 411
 412 char *get_name(void) {
 413         char *name = NULL;
 414         char *returned_name;
 415
 416         get_config_string(lookup_config(config_tree, "Name"), &name);
 417
 418         if(!name)
 419                 return NULL;
 420
 421         returned_name = replace_name(name);
 422         free(name);
 423         return returned_name;
 424 }
 425
 426 bool setup_myself_reloadable(void) {
 427         char *proxy = NULL;
 428         char *rmode = NULL;
 429         char *fmode = NULL;
 430         char *bmode = NULL;
 431         char *afname = NULL;
 432         char *space;
 433         bool choice;
 434
 435         free(scriptinterpreter);
 436         scriptinterpreter = NULL;
 437         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 438
 439
 440         free(scriptextension);
 441         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 442                 scriptextension = xstrdup("");
 443
 444         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 445         if(proxy) {
 446                 if((space = strchr(proxy, ' ')))
 447                         *space++ = 0;
 448
 449                 if(!strcasecmp(proxy, "none")) {
 450                         proxytype = PROXY_NONE;
 451                 } else if(!strcasecmp(proxy, "socks4")) {
 452                         proxytype = PROXY_SOCKS4;
 453                 } else if(!strcasecmp(proxy, "socks4a")) {
 454                         proxytype = PROXY_SOCKS4A;
 455                 } else if(!strcasecmp(proxy, "socks5")) {
 456                         proxytype = PROXY_SOCKS5;
 457                 } else if(!strcasecmp(proxy, "http")) {
 458                         proxytype = PROXY_HTTP;
 459                 } else if(!strcasecmp(proxy, "exec")) {
 460                         proxytype = PROXY_EXEC;
 461                 } else {
 462                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 463                         return false;
 464                 }
 465
 466                 switch(proxytype) {
 467                         case PROXY_NONE:
 468                         default:
 469                                 break;
 470
 471                         case PROXY_EXEC:
 472                                 if(!space || !*space) {
 473                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 474                                         return false;
 475                                 }
 476                                 proxyhost =  xstrdup(space);
 477                                 break;
 478
 479                         case PROXY_SOCKS4:
 480                         case PROXY_SOCKS4A:
 481                         case PROXY_SOCKS5:
 482                         case PROXY_HTTP:
 483                                 proxyhost = space;
 484                                 if(space && (space = strchr(space, ' ')))
 485                                         *space++ = 0, proxyport = space;
 486                                 if(space && (space = strchr(space, ' ')))
 487                                         *space++ = 0, proxyuser = space;
 488                                 if(space && (space = strchr(space, ' ')))
 489                                         *space++ = 0, proxypass = space;
 490                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 491                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 492                                         return false;
 493                                 }
 494                                 proxyhost = xstrdup(proxyhost);
 495                                 proxyport = xstrdup(proxyport);
 496                                 if(proxyuser && *proxyuser)
 497                                         proxyuser = xstrdup(proxyuser);
 498                                 if(proxypass && *proxypass)
 499                                         proxypass = xstrdup(proxypass);
 500                                 break;
 501                 }
 502
 503                 free(proxy);
 504         }
 505
 506         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 507                 myself->options |= OPTION_INDIRECT;
 508
 509         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 510                 myself->options |= OPTION_TCPONLY;
 511
 512         if(myself->options & OPTION_TCPONLY)
 513                 myself->options |= OPTION_INDIRECT;
 514
 515         get_config_bool(lookup_config(config_tree, "UDPDiscovery"), &udp_discovery);
 516         get_config_int(lookup_config(config_tree, "UDPDiscoveryKeepaliveInterval"), &udp_discovery_keepalive_interval);
 517         get_config_int(lookup_config(config_tree, "UDPDiscoveryInterval"), &udp_discovery_interval);
 518         get_config_int(lookup_config(config_tree, "UDPDiscoveryTimeout"), &udp_discovery_timeout);
 519
 520         get_config_int(lookup_config(config_tree, "MTUInfoInterval"), &mtu_info_interval);
 521         get_config_int(lookup_config(config_tree, "UDPInfoInterval"), &udp_info_interval);
 522
 523         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 524         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 525
 526         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 527                 if(!strcasecmp(rmode, "router"))
 528                         routing_mode = RMODE_ROUTER;
 529                 else if(!strcasecmp(rmode, "switch"))
 530                         routing_mode = RMODE_SWITCH;
 531                 else if(!strcasecmp(rmode, "hub"))
 532                         routing_mode = RMODE_HUB;
 533                 else {
 534                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 535                         return false;
 536                 }
 537                 free(rmode);
 538         }
 539
 540         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 541                 if(!strcasecmp(fmode, "off"))
 542                         forwarding_mode = FMODE_OFF;
 543                 else if(!strcasecmp(fmode, "internal"))
 544                         forwarding_mode = FMODE_INTERNAL;
 545                 else if(!strcasecmp(fmode, "kernel"))
 546                         forwarding_mode = FMODE_KERNEL;
 547                 else {
 548                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 549                         return false;
 550                 }
 551                 free(fmode);
 552         }
 553
 554         choice = true;
 555         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 556         if(choice)
 557                 myself->options |= OPTION_PMTU_DISCOVERY;
 558
 559         choice = true;
 560         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 561         if(choice)
 562                 myself->options |= OPTION_CLAMP_MSS;
 563
 564         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 565         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 566         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 567                 if(!strcasecmp(bmode, "no"))
 568                         broadcast_mode = BMODE_NONE;
 569                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 570                         broadcast_mode = BMODE_MST;
 571                 else if(!strcasecmp(bmode, "direct"))
 572                         broadcast_mode = BMODE_DIRECT;
 573                 else {
 574                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 575                         return false;
 576                 }
 577                 free(bmode);
 578         }
 579
 580         const char* const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
 581         for (size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
 582                 subnet_t *s = new_subnet();
 583                 if (!str2net(s, DEFAULT_BROADCAST_SUBNETS[i]))
 584                         abort();
 585                 subnet_add(NULL, s);
 586         }
 587         for (config_t* cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 588                 subnet_t *s;
 589                 if (!get_config_subnet(cfg, &s))
 590                         continue;
 591                 subnet_add(NULL, s);
 592         }
 593
 594 #if !defined(SOL_IP) || !defined(IP_TOS)
 595         if(priorityinheritance)
 596                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 597 #endif
 598
 599         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 600                 macexpire = 600;
 601
 602         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 603                 if(maxtimeout <= 0) {
 604                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 605                         return false;
 606                 }
 607         } else
 608                 maxtimeout = 900;
 609
 610         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 611                 if(!strcasecmp(afname, "IPv4"))
 612                         addressfamily = AF_INET;
 613                 else if(!strcasecmp(afname, "IPv6"))
 614                         addressfamily = AF_INET6;
 615                 else if(!strcasecmp(afname, "any"))
 616                         addressfamily = AF_UNSPEC;
 617                 else {
 618                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 619                         return false;
 620                 }
 621                 free(afname);
 622         }
 623
 624         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 625
 626         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 627                 keylifetime = 3600;
 628
 629         config_t *cfg = lookup_config(config_tree, "AutoConnect");
 630         if(cfg) {
 631                 if(!get_config_bool(cfg, &autoconnect)) {
 632                         // Some backwards compatibility with when this option was an int
 633                         int val = 0;
 634                         get_config_int(cfg, &val);
 635                         autoconnect = val;
 636                 }
 637         }
 638
 639         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 640
 641         read_invitation_key();
 642
 643         return true;
 644 }
 645
 646 /*
 647   Add listening sockets.
 648 */
 649 static bool add_listen_address(char *address, bool bindto) {
 650         char *port = myport;
 651
 652         if(address) {
 653                 char *space = strchr(address, ' ');
 654                 if(space) {
 655                         *space++ = 0;
 656                         port = space;
 657                 }
 658
 659                 if(!strcmp(address, "*"))
 660                         *address = 0;
 661         }
 662
 663         struct addrinfo *ai, hint = {0};
 664         hint.ai_family = addressfamily;
 665         hint.ai_socktype = SOCK_STREAM;
 666         hint.ai_protocol = IPPROTO_TCP;
 667         hint.ai_flags = AI_PASSIVE;
 668
 669 #if HAVE_DECL_RES_INIT
 670         res_init();
 671 #endif
 672         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 673         free(address);
 674
 675         if(err || !ai) {
 676                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 677                 return false;
 678         }
 679
 680         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 681                 // Ignore duplicate addresses
 682                 bool found = false;
 683
 684                 for(int i = 0; i < listen_sockets; i++)
 685                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 686                                 found = true;
 687                                 break;
 688                         }
 689
 690                 if(found)
 691                         continue;
 692
 693                 if(listen_sockets >= MAXSOCKETS) {
 694                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 695                         return false;
 696                 }
 697
 698                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 699
 700                 if(tcp_fd < 0)
 701                         continue;
 702
 703                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 704
 705                 if(tcp_fd < 0) {
 706                         close(tcp_fd);
 707                         continue;
 708                 }
 709
 710                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 711                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 712
 713                 if(debug_level >= DEBUG_CONNECTIONS) {
 714                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 715                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 716                         free(hostname);
 717                 }
 718
 719                 listen_socket[listen_sockets].bindto = bindto;
 720                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 721                 listen_sockets++;
 722         }
 723
 724         freeaddrinfo(ai);
 725         return true;
 726 }
 727
 728 void device_enable(void) {
 729         if (devops.enable)
 730                 devops.enable();
 731
 732         /* Run tinc-up script to further initialize the tap interface */
 733
 734         char *envp[5] = {NULL};
 735         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 736         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 737         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 738         xasprintf(&envp[3], "NAME=%s", myname);
 739
 740         execute_script("tinc-up", envp);
 741
 742         for(int i = 0; i < 4; i++)
 743                 free(envp[i]);
 744 }
 745
 746 void device_disable(void) {
 747         char *envp[5] = {NULL};
 748         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 749         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 750         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 751         xasprintf(&envp[3], "NAME=%s", myname);
 752
 753         execute_script("tinc-down", envp);
 754
 755         for(int i = 0; i < 4; i++)
 756                 free(envp[i]);
 757
 758         if (devops.disable)
 759                 devops.disable();
 760 }
 761
 762 /*
 763   Configure node_t myself and set up the local sockets (listen only)
 764 */
 765 static bool setup_myself(void) {
 766         char *name, *hostname, *cipher, *digest, *type;
 767         char *address = NULL;
 768         bool port_specified = false;
 769
 770         if(!(name = get_name())) {
 771                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 772                 return false;
 773         }
 774
 775         myname = xstrdup(name);
 776         myself = new_node();
 777         myself->connection = new_connection();
 778         myself->name = name;
 779         myself->connection->name = xstrdup(name);
 780         read_host_config(config_tree, name);
 781
 782         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 783                 myport = xstrdup("655");
 784         else
 785                 port_specified = true;
 786
 787         myself->connection->options = 0;
 788         myself->connection->protocol_major = PROT_MAJOR;
 789         myself->connection->protocol_minor = PROT_MINOR;
 790
 791         myself->options |= PROT_MINOR << 24;
 792
 793 #ifdef DISABLE_LEGACY
 794         experimental = read_ecdsa_private_key();
 795         if(!experimental) {
 796                 logger(DEBUG_ALWAYS, LOG_ERR, "No private key available, cannot start tinc!");
 797                 return false;
 798         }
 799 #else
 800         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 801                 experimental = read_ecdsa_private_key();
 802                 if(!experimental)
 803                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 804         } else {
 805                 if(experimental && !read_ecdsa_private_key())
 806                         return false;
 807         }
 808
 809         if(!read_rsa_private_key()) {
 810                 if(experimental) {
 811                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for legacy protocol disabled.");
 812                 } else {
 813                         logger(DEBUG_ALWAYS, LOG_ERR, "No private keys available, cannot start tinc!");
 814                         return false;
 815                 }
 816         }
 817 #endif
 818
 819         /* Ensure myport is numeric */
 820
 821         if(!atoi(myport)) {
 822                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 823                 sockaddr_t sa;
 824                 if(!ai || !ai->ai_addr)
 825                         return false;
 826                 free(myport);
 827                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 828                 sockaddr2str(&sa, NULL, &myport);
 829         }
 830
 831         /* Read in all the subnets specified in the host configuration file */
 832
 833         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 834                 subnet_t *subnet;
 835
 836                 if(!get_config_subnet(cfg, &subnet))
 837                         return false;
 838
 839                 subnet_add(myself, subnet);
 840         }
 841
 842         /* Check some options */
 843
 844         if(!setup_myself_reloadable())
 845                 return false;
 846
 847         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 848         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 849         strictsubnets |= tunnelserver;
 850
 851         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 852                 if(max_connection_burst <= 0) {
 853                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 854                         return false;
 855                 }
 856         }
 857
 858         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 859                 if(udp_rcvbuf < 0) {
 860                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 861                         return false;
 862                 }
 863         }
 864
 865         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 866                 if(udp_sndbuf < 0) {
 867                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 868                         return false;
 869                 }
 870         }
 871
 872         int replaywin_int;
 873         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 874                 if(replaywin_int < 0) {
 875                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 876                         return false;
 877                 }
 878                 replaywin = (unsigned)replaywin_int;
 879                 sptps_replaywin = replaywin;
 880         }
 881
 882 #ifndef DISABLE_LEGACY
 883         /* Generate packet encryption key */
 884
 885         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 886                 cipher = xstrdup("blowfish");
 887
 888         if(!strcasecmp(cipher, "none")) {
 889                 myself->incipher = NULL;
 890         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 891                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 892                 return false;
 893         }
 894
 895         free(cipher);
 896
 897         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 898
 899         /* Check if we want to use message authentication codes... */
 900
 901         int maclength = 4;
 902         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 903
 904         if(maclength < 0) {
 905                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 906                 return false;
 907         }
 908
 909         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 910                 digest = xstrdup("sha1");
 911
 912         if(!strcasecmp(digest, "none")) {
 913                 myself->indigest = NULL;
 914         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 915                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 916                 return false;
 917         }
 918
 919         free(digest);
 920 #endif
 921
 922         /* Compression */
 923
 924         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 925                 if(myself->incompression < 0 || myself->incompression > 11) {
 926                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 927                         return false;
 928                 }
 929         } else
 930                 myself->incompression = 0;
 931
 932         myself->connection->outcompression = 0;
 933
 934         /* Done */
 935
 936         myself->nexthop = myself;
 937         myself->via = myself;
 938         myself->status.reachable = true;
 939         myself->last_state_change = now.tv_sec;
 940         myself->status.sptps = experimental;
 941         node_add(myself);
 942
 943         graph();
 944
 945         if(strictsubnets)
 946                 load_all_subnets();
 947         else if(autoconnect)
 948                 load_all_nodes();
 949
 950         /* Open device */
 951
 952         devops = os_devops;
 953
 954         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 955                 if(!strcasecmp(type, "dummy"))
 956                         devops = dummy_devops;
 957                 else if(!strcasecmp(type, "raw_socket"))
 958                         devops = raw_socket_devops;
 959                 else if(!strcasecmp(type, "multicast"))
 960                         devops = multicast_devops;
 961 #ifdef ENABLE_UML
 962                 else if(!strcasecmp(type, "uml"))
 963                         devops = uml_devops;
 964 #endif
 965 #ifdef ENABLE_VDE
 966                 else if(!strcasecmp(type, "vde"))
 967                         devops = vde_devops;
 968 #endif
 969                 free(type);
 970         }
 971
 972         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
 973
 974         if(!devops.setup())
 975                 return false;
 976
 977         if(device_fd >= 0)
 978                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 979
 980         /* Open sockets */
 981
 982         if(!do_detach && getenv("LISTEN_FDS")) {
 983                 sockaddr_t sa;
 984                 socklen_t salen;
 985
 986                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 987 #ifdef HAVE_UNSETENV
 988                 unsetenv("LISTEN_FDS");
 989 #endif
 990
 991                 if(listen_sockets > MAXSOCKETS) {
 992                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 993                         return false;
 994                 }
 995
 996                 for(int i = 0; i < listen_sockets; i++) {
 997                         salen = sizeof sa;
 998                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 999                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
1000                                 return false;
1001                         }
1002
1003 #ifdef FD_CLOEXEC
1004                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
1005 #endif
1006
1007                         int udp_fd = setup_vpn_in_socket(&sa);
1008                         if(udp_fd < 0)
1009                                 return false;
1010
1011                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
1012                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
1013
1014                         if(debug_level >= DEBUG_CONNECTIONS) {
1015                                 hostname = sockaddr2hostname(&sa);
1016                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
1017                                 free(hostname);
1018                         }
1019
1020                         memcpy(&listen_socket[i].sa, &sa, salen);
1021                 }
1022         } else {
1023                 listen_sockets = 0;
1024                 int cfgs = 0;
1025
1026                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1027                         cfgs++;
1028                         get_config_string(cfg, &address);
1029                         if(!add_listen_address(address, true))
1030                                 return false;
1031                 }
1032
1033                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1034                         cfgs++;
1035                         get_config_string(cfg, &address);
1036                         if(!add_listen_address(address, false))
1037                                 return false;
1038                 }
1039
1040                 if(!cfgs)
1041                         if(!add_listen_address(address, NULL))
1042                                 return false;
1043         }
1044
1045         if(!listen_sockets) {
1046                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1047                 return false;
1048         }
1049
1050         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1051
1052         if(!port_specified || atoi(myport) == 0) {
1053                 sockaddr_t sa;
1054                 socklen_t salen = sizeof sa;
1055                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1056                         free(myport);
1057                         sockaddr2str(&sa, NULL, &myport);
1058                         if(!myport)
1059                                 myport = xstrdup("655");
1060                 }
1061         }
1062
1063         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1064         myself->connection->hostname = xstrdup(myself->hostname);
1065
1066         char *upnp = NULL;
1067         get_config_string(lookup_config(config_tree, "UPnP"), &upnp);
1068         bool upnp_tcp = false;
1069         bool upnp_udp = false;
1070         if (upnp) {
1071                 if (!strcasecmp(upnp, "yes"))
1072                         upnp_tcp = upnp_udp = true;
1073                 else if (!strcasecmp(upnp, "udponly"))
1074                         upnp_udp = true;
1075                 free(upnp);
1076         }
1077         if (upnp_tcp || upnp_udp) {
1078 #ifdef HAVE_MINIUPNPC
1079                 upnp_init(upnp_tcp, upnp_udp);
1080 #else
1081                 logger(DEBUG_ALWAYS, LOG_WARNING, "UPnP was requested, but tinc isn't built with miniupnpc support!");
1082 #endif
1083         }
1084
1085         /* Done. */
1086
1087         last_config_check = now.tv_sec;
1088
1089         return true;
1090 }
1091
1092 /*
1093   initialize network
1094 */
1095 bool setup_network(void) {
1096         init_connections();
1097         init_subnets();
1098         init_nodes();
1099         init_edges();
1100         init_requests();
1101
1102         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1103                 if(pinginterval < 1) {
1104                         pinginterval = 86400;
1105                 }
1106         } else
1107                 pinginterval = 60;
1108
1109         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
1110                 pingtimeout = 5;
1111         if(pingtimeout < 1 || pingtimeout > pinginterval)
1112                 pingtimeout = pinginterval;
1113
1114         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
1115                 maxoutbufsize = 10 * MTU;
1116
1117         if(!setup_myself())
1118                 return false;
1119
1120         if(!init_control())
1121                 return false;
1122
1123         if (!device_standby)
1124                 device_enable();
1125
1126         /* Run subnet-up scripts for our own subnets */
1127
1128         subnet_update(myself, NULL, true);
1129
1130         return true;
1131 }
1132
1133 /*
1134   close all open network connections
1135 */
1136 void close_network_connections(void) {
1137         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1138                 next = node->next;
1139                 connection_t *c = node->data;
1140                 /* Keep control connections open until the end, so they know when we really terminated */
1141                 if(c->status.control)
1142                         c->socket = -1;
1143                 c->outgoing = NULL;
1144                 terminate_connection(c, false);
1145         }
1146
1147         if(outgoing_list)
1148                 list_delete_list(outgoing_list);
1149
1150         if(myself && myself->connection) {
1151                 subnet_update(myself, NULL, false);
1152                 terminate_connection(myself->connection, false);
1153                 free_connection(myself->connection);
1154         }
1155
1156         for(int i = 0; i < listen_sockets; i++) {
1157                 io_del(&listen_socket[i].tcp);
1158                 io_del(&listen_socket[i].udp);
1159                 close(listen_socket[i].tcp.fd);
1160                 close(listen_socket[i].udp.fd);
1161         }
1162
1163         exit_requests();
1164         exit_edges();
1165         exit_subnets();
1166         exit_nodes();
1167         exit_connections();
1168
1169         if (!device_standby)
1170                 device_disable();
1171
1172         free(myport);
1173
1174         if (device_fd >= 0)
1175                 io_del(&device_io);
1176         if (devops.close)
1177                 devops.close();
1178
1179         exit_control();
1180
1181         free(myname);
1182         free(scriptextension);
1183         free(scriptinterpreter);
1184
1185         return;
1186 }