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                   2000-2017 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 io_t device_io;
  52 devops_t devops;
  53 bool device_standby = false;
  54
  55 char *proxyhost;
  56 char *proxyport;
  57 char *proxyuser;
  58 char *proxypass;
  59 proxytype_t proxytype;
  60 bool autoconnect;
  61 bool disablebuggypeers;
  62
  63 char *scriptinterpreter;
  64 char *scriptextension;
  65
  66 bool node_read_ecdsa_public_key(node_t *n) {
  67         if(ecdsa_active(n->ecdsa))
  68                 return true;
  69
  70         splay_tree_t *config_tree;
  71         FILE *fp;
  72         char *pubname = NULL;
  73         char *p;
  74
  75         init_configuration(&config_tree);
  76         if(!read_host_config(config_tree, n->name))
  77                 goto exit;
  78
  79         /* First, check for simple Ed25519PublicKey statement */
  80
  81         if(get_config_string(lookup_config(config_tree, "Ed25519PublicKey"), &p)) {
  82                 n->ecdsa = ecdsa_set_base64_public_key(p);
  83                 free(p);
  84                 goto exit;
  85         }
  86
  87         /* Else, check for Ed25519PublicKeyFile statement and read it */
  88
  89         if(!get_config_string(lookup_config(config_tree, "Ed25519PublicKeyFile"), &pubname))
  90                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  91
  92         fp = fopen(pubname, "r");
  93
  94         if(!fp)
  95                 goto exit;
  96
  97         n->ecdsa = ecdsa_read_pem_public_key(fp);
  98         fclose(fp);
  99
 100 exit:
 101         exit_configuration(&config_tree);
 102         free(pubname);
 103         return n->ecdsa;
 104 }
 105
 106 bool read_ecdsa_public_key(connection_t *c) {
 107         if(ecdsa_active(c->ecdsa))
 108                 return true;
 109
 110         FILE *fp;
 111         char *fname;
 112         char *p;
 113
 114         if(!c->config_tree) {
 115                 init_configuration(&c->config_tree);
 116                 if(!read_host_config(c->config_tree, c->name))
 117                         return false;
 118         }
 119
 120         /* First, check for simple Ed25519PublicKey statement */
 121
 122         if(get_config_string(lookup_config(c->config_tree, "Ed25519PublicKey"), &p)) {
 123                 c->ecdsa = ecdsa_set_base64_public_key(p);
 124                 free(p);
 125                 return c->ecdsa;
 126         }
 127
 128         /* Else, check for Ed25519PublicKeyFile statement and read it */
 129
 130         if(!get_config_string(lookup_config(c->config_tree, "Ed25519PublicKeyFile"), &fname))
 131                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 132
 133         fp = fopen(fname, "r");
 134
 135         if(!fp) {
 136                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 public key file `%s': %s",
 137                            fname, strerror(errno));
 138                 free(fname);
 139                 return false;
 140         }
 141
 142         c->ecdsa = ecdsa_read_pem_public_key(fp);
 143
 144         if(!c->ecdsa && errno != ENOENT)
 145                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing Ed25519 public key file `%s' failed.", fname);
 146
 147         fclose(fp);
 148         free(fname);
 149         return c->ecdsa;
 150 }
 151
 152 #ifndef DISABLE_LEGACY
 153 bool read_rsa_public_key(connection_t *c) {
 154         FILE *fp;
 155         char *fname;
 156         char *n;
 157
 158         /* First, check for simple PublicKey statement */
 159
 160         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 161                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 162                 free(n);
 163                 return c->rsa;
 164         }
 165
 166         /* Else, check for PublicKeyFile statement and read it */
 167
 168         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 169                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 170
 171         fp = fopen(fname, "r");
 172
 173         if(!fp) {
 174                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 175                 free(fname);
 176                 return false;
 177         }
 178
 179         c->rsa = rsa_read_pem_public_key(fp);
 180         fclose(fp);
 181
 182         if(!c->rsa)
 183                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 184         free(fname);
 185         return c->rsa;
 186 }
 187 #endif
 188
 189 static bool read_ecdsa_private_key(void) {
 190         FILE *fp;
 191         char *fname;
 192
 193         /* Check for PrivateKeyFile statement and read it */
 194
 195         if(!get_config_string(lookup_config(config_tree, "Ed25519PrivateKeyFile"), &fname))
 196                 xasprintf(&fname, "%s" SLASH "ed25519_key.priv", confbase);
 197
 198         fp = fopen(fname, "r");
 199
 200         if(!fp) {
 201                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 private key file `%s': %s", fname, strerror(errno));
 202                 if(errno == ENOENT)
 203                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an Ed25519 keypair with `tinc -n %s generate-ed25519-keys'.", netname ?: ".");
 204                 free(fname);
 205                 return false;
 206         }
 207
 208 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 209         struct stat s;
 210
 211         if(fstat(fileno(fp), &s)) {
 212                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat Ed25519 private key file `%s': %s'", fname, strerror(errno));
 213                 free(fname);
 214                 return false;
 215         }
 216
 217         if(s.st_mode & ~0100700)
 218                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for Ed25519 private key file `%s'!", fname);
 219 #endif
 220
 221         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 222         fclose(fp);
 223
 224         if(!myself->connection->ecdsa)
 225                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 226         free(fname);
 227         return myself->connection->ecdsa;
 228 }
 229
 230 static bool read_invitation_key(void) {
 231         FILE *fp;
 232         char fname[PATH_MAX];
 233
 234         if(invitation_key) {
 235                 ecdsa_free(invitation_key);
 236                 invitation_key = NULL;
 237         }
 238
 239         snprintf(fname, sizeof(fname), "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
 240
 241         fp = fopen(fname, "r");
 242
 243         if(fp) {
 244                 invitation_key = ecdsa_read_pem_private_key(fp);
 245                 fclose(fp);
 246                 if(!invitation_key)
 247                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 248         }
 249
 250         return invitation_key;
 251 }
 252
 253 #ifndef DISABLE_LEGACY
 254 static bool read_rsa_private_key(void) {
 255         FILE *fp;
 256         char *fname;
 257         char *n, *d;
 258
 259         /* First, check for simple PrivateKey statement */
 260
 261         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 262                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 263                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 264                         free(d);
 265                         return false;
 266                 }
 267                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 268                 free(n);
 269                 free(d);
 270                 return myself->connection->rsa;
 271         }
 272
 273         /* Else, check for PrivateKeyFile statement and read it */
 274
 275         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 276                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 277
 278         fp = fopen(fname, "r");
 279
 280         if(!fp) {
 281                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 282                            fname, strerror(errno));
 283                 if(errno == ENOENT)
 284                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an RSA keypair with `tinc -n %s generate-rsa-keys'.", netname ?: ".");
 285                 free(fname);
 286                 return false;
 287         }
 288
 289 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 290         struct stat s;
 291
 292         if(fstat(fileno(fp), &s)) {
 293                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 294                 free(fname);
 295                 return false;
 296         }
 297
 298         if(s.st_mode & ~0100700)
 299                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 300 #endif
 301
 302         myself->connection->rsa = rsa_read_pem_private_key(fp);
 303         fclose(fp);
 304
 305         if(!myself->connection->rsa)
 306                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 307         free(fname);
 308         return myself->connection->rsa;
 309 }
 310 #endif
 311
 312 static timeout_t keyexpire_timeout;
 313
 314 static void keyexpire_handler(void *data) {
 315         regenerate_key();
 316         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 317 }
 318
 319 void regenerate_key(void) {
 320         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 321         send_key_changed();
 322         for splay_each(node_t, n, node_tree)
 323                 n->status.validkey_in = false;
 324 }
 325
 326 void load_all_nodes(void) {
 327         DIR *dir;
 328         struct dirent *ent;
 329         char dname[PATH_MAX];
 330
 331         snprintf(dname, sizeof(dname), "%s" SLASH "hosts", confbase);
 332         dir = opendir(dname);
 333         if(!dir) {
 334                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 335                 return;
 336         }
 337
 338         while((ent = readdir(dir))) {
 339                 if(!check_id(ent->d_name))
 340                         continue;
 341
 342                 node_t *n = lookup_node(ent->d_name);
 343
 344                 splay_tree_t *config_tree;
 345                 init_configuration(&config_tree);
 346                 read_config_options(config_tree, ent->d_name);
 347                 read_host_config(config_tree, ent->d_name);
 348
 349                 if(!n) {
 350                         n = new_node();
 351                         n->name = xstrdup(ent->d_name);
 352                         node_add(n);
 353                 }
 354
 355                 if(strictsubnets) {
 356                         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 357                                 subnet_t *s, *s2;
 358
 359                                 if(!get_config_subnet(cfg, &s))
 360                                         continue;
 361
 362                                 if((s2 = lookup_subnet(n, s))) {
 363                                         s2->expires = -1;
 364                                         free(s);
 365                                 } else {
 366                                         subnet_add(n, s);
 367                                 }
 368                         }
 369                 }
 370
 371                 if(lookup_config(config_tree, "Address"))
 372                         n->status.has_address = true;
 373
 374                 exit_configuration(&config_tree);
 375         }
 376
 377         closedir(dir);
 378 }
 379
 380 char *get_name(void) {
 381         char *name = NULL;
 382         char *returned_name;
 383
 384         get_config_string(lookup_config(config_tree, "Name"), &name);
 385
 386         if(!name)
 387                 return NULL;
 388
 389         returned_name = replace_name(name);
 390         free(name);
 391         return returned_name;
 392 }
 393
 394 bool setup_myself_reloadable(void) {
 395         char *proxy = NULL;
 396         char *rmode = NULL;
 397         char *fmode = NULL;
 398         char *bmode = NULL;
 399         char *afname = NULL;
 400         char *space;
 401         bool choice;
 402
 403         free(scriptinterpreter);
 404         scriptinterpreter = NULL;
 405         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 406
 407
 408         free(scriptextension);
 409         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 410                 scriptextension = xstrdup("");
 411
 412         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 413         if(proxy) {
 414                 if((space = strchr(proxy, ' ')))
 415                         *space++ = 0;
 416
 417                 if(!strcasecmp(proxy, "none")) {
 418                         proxytype = PROXY_NONE;
 419                 } else if(!strcasecmp(proxy, "socks4")) {
 420                         proxytype = PROXY_SOCKS4;
 421                 } else if(!strcasecmp(proxy, "socks4a")) {
 422                         proxytype = PROXY_SOCKS4A;
 423                 } else if(!strcasecmp(proxy, "socks5")) {
 424                         proxytype = PROXY_SOCKS5;
 425                 } else if(!strcasecmp(proxy, "http")) {
 426                         proxytype = PROXY_HTTP;
 427                 } else if(!strcasecmp(proxy, "exec")) {
 428                         proxytype = PROXY_EXEC;
 429                 } else {
 430                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 431                         return false;
 432                 }
 433
 434                 switch(proxytype) {
 435                         case PROXY_NONE:
 436                         default:
 437                                 break;
 438
 439                         case PROXY_EXEC:
 440                                 if(!space || !*space) {
 441                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 442                                         return false;
 443                                 }
 444                                 proxyhost =  xstrdup(space);
 445                                 break;
 446
 447                         case PROXY_SOCKS4:
 448                         case PROXY_SOCKS4A:
 449                         case PROXY_SOCKS5:
 450                         case PROXY_HTTP:
 451                                 proxyhost = space;
 452                                 if(space && (space = strchr(space, ' ')))
 453                                         *space++ = 0, proxyport = space;
 454                                 if(space && (space = strchr(space, ' ')))
 455                                         *space++ = 0, proxyuser = space;
 456                                 if(space && (space = strchr(space, ' ')))
 457                                         *space++ = 0, proxypass = space;
 458                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 459                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 460                                         return false;
 461                                 }
 462                                 proxyhost = xstrdup(proxyhost);
 463                                 proxyport = xstrdup(proxyport);
 464                                 if(proxyuser && *proxyuser)
 465                                         proxyuser = xstrdup(proxyuser);
 466                                 if(proxypass && *proxypass)
 467                                         proxypass = xstrdup(proxypass);
 468                                 break;
 469                 }
 470
 471                 free(proxy);
 472         }
 473
 474         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 475                 myself->options |= OPTION_INDIRECT;
 476
 477         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 478                 myself->options |= OPTION_TCPONLY;
 479
 480         if(myself->options & OPTION_TCPONLY)
 481                 myself->options |= OPTION_INDIRECT;
 482
 483         get_config_bool(lookup_config(config_tree, "UDPDiscovery"), &udp_discovery);
 484         get_config_int(lookup_config(config_tree, "UDPDiscoveryKeepaliveInterval"), &udp_discovery_keepalive_interval);
 485         get_config_int(lookup_config(config_tree, "UDPDiscoveryInterval"), &udp_discovery_interval);
 486         get_config_int(lookup_config(config_tree, "UDPDiscoveryTimeout"), &udp_discovery_timeout);
 487
 488         get_config_int(lookup_config(config_tree, "MTUInfoInterval"), &mtu_info_interval);
 489         get_config_int(lookup_config(config_tree, "UDPInfoInterval"), &udp_info_interval);
 490
 491         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 492         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 493
 494         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 495                 if(!strcasecmp(rmode, "router"))
 496                         routing_mode = RMODE_ROUTER;
 497                 else if(!strcasecmp(rmode, "switch"))
 498                         routing_mode = RMODE_SWITCH;
 499                 else if(!strcasecmp(rmode, "hub"))
 500                         routing_mode = RMODE_HUB;
 501                 else {
 502                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 503                         return false;
 504                 }
 505                 free(rmode);
 506         }
 507
 508         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 509                 if(!strcasecmp(fmode, "off"))
 510                         forwarding_mode = FMODE_OFF;
 511                 else if(!strcasecmp(fmode, "internal"))
 512                         forwarding_mode = FMODE_INTERNAL;
 513                 else if(!strcasecmp(fmode, "kernel"))
 514                         forwarding_mode = FMODE_KERNEL;
 515                 else {
 516                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 517                         return false;
 518                 }
 519                 free(fmode);
 520         }
 521
 522         choice = true;
 523         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 524         if(choice)
 525                 myself->options |= OPTION_PMTU_DISCOVERY;
 526
 527         choice = true;
 528         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 529         if(choice)
 530                 myself->options |= OPTION_CLAMP_MSS;
 531
 532         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 533         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 534         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 535                 if(!strcasecmp(bmode, "no"))
 536                         broadcast_mode = BMODE_NONE;
 537                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 538                         broadcast_mode = BMODE_MST;
 539                 else if(!strcasecmp(bmode, "direct"))
 540                         broadcast_mode = BMODE_DIRECT;
 541                 else {
 542                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 543                         return false;
 544                 }
 545                 free(bmode);
 546         }
 547
 548         const char* const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
 549         for (size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
 550                 subnet_t *s = new_subnet();
 551                 if (!str2net(s, DEFAULT_BROADCAST_SUBNETS[i]))
 552                         abort();
 553                 subnet_add(NULL, s);
 554         }
 555         for (config_t* cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 556                 subnet_t *s;
 557                 if (!get_config_subnet(cfg, &s))
 558                         continue;
 559                 subnet_add(NULL, s);
 560         }
 561
 562 #if !defined(IPPROTO_IP) || !defined(IP_TOS)
 563         if(priorityinheritance)
 564                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv4 connections", "PriorityInheritance");
 565 #endif
 566
 567 #if !defined(IPPROTO_IPV6) || !defined(IPV6_TCLASS)
 568         if(priorityinheritance)
 569                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv6 connections", "PriorityInheritance");
 570 #endif
 571
 572         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 573                 macexpire = 600;
 574
 575         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 576                 if(maxtimeout <= 0) {
 577                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 578                         return false;
 579                 }
 580         } else
 581                 maxtimeout = 900;
 582
 583         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 584                 if(!strcasecmp(afname, "IPv4"))
 585                         addressfamily = AF_INET;
 586                 else if(!strcasecmp(afname, "IPv6"))
 587                         addressfamily = AF_INET6;
 588                 else if(!strcasecmp(afname, "any"))
 589                         addressfamily = AF_UNSPEC;
 590                 else {
 591                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 592                         return false;
 593                 }
 594                 free(afname);
 595         }
 596
 597         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 598
 599         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 600                 keylifetime = 3600;
 601
 602         config_t *cfg = lookup_config(config_tree, "AutoConnect");
 603         if(cfg) {
 604                 if(!get_config_bool(cfg, &autoconnect)) {
 605                         // Some backwards compatibility with when this option was an int
 606                         int val = 0;
 607                         get_config_int(cfg, &val);
 608                         autoconnect = val;
 609                 }
 610         }
 611
 612         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 613
 614         if(!get_config_int(lookup_config(config_tree, "InvitationExpire"), &invitation_lifetime))
 615                 invitation_lifetime = 604800; // 1 week
 616
 617         read_invitation_key();
 618
 619         return true;
 620 }
 621
 622 /*
 623   Add listening sockets.
 624 */
 625 static bool add_listen_address(char *address, bool bindto) {
 626         char *port = myport;
 627
 628         if(address) {
 629                 char *space = strchr(address, ' ');
 630                 if(space) {
 631                         *space++ = 0;
 632                         port = space;
 633                 }
 634
 635                 if(!strcmp(address, "*"))
 636                         *address = 0;
 637         }
 638
 639         struct addrinfo *ai, hint = {0};
 640         hint.ai_family = addressfamily;
 641         hint.ai_socktype = SOCK_STREAM;
 642         hint.ai_protocol = IPPROTO_TCP;
 643         hint.ai_flags = AI_PASSIVE;
 644
 645 #if HAVE_DECL_RES_INIT
 646         res_init();
 647 #endif
 648         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 649         free(address);
 650
 651         if(err || !ai) {
 652                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 653                 return false;
 654         }
 655
 656         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 657                 // Ignore duplicate addresses
 658                 bool found = false;
 659
 660                 for(int i = 0; i < listen_sockets; i++)
 661                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 662                                 found = true;
 663                                 break;
 664                         }
 665
 666                 if(found)
 667                         continue;
 668
 669                 if(listen_sockets >= MAXSOCKETS) {
 670                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 671                         return false;
 672                 }
 673
 674                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 675
 676                 if(tcp_fd < 0)
 677                         continue;
 678
 679                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 680
 681                 if(udp_fd < 0) {
 682                         close(tcp_fd);
 683                         continue;
 684                 }
 685
 686                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 687                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 688
 689                 if(debug_level >= DEBUG_CONNECTIONS) {
 690                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 691                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 692                         free(hostname);
 693                 }
 694
 695                 listen_socket[listen_sockets].bindto = bindto;
 696                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 697                 listen_sockets++;
 698         }
 699
 700         freeaddrinfo(ai);
 701         return true;
 702 }
 703
 704 void device_enable(void) {
 705         if (devops.enable)
 706                 devops.enable();
 707
 708         /* Run tinc-up script to further initialize the tap interface */
 709
 710         environment_t env;
 711         environment_init(&env);
 712         execute_script("tinc-up", &env);
 713         environment_exit(&env);
 714 }
 715
 716 void device_disable(void) {
 717         environment_t env;
 718         environment_init(&env);
 719         execute_script("tinc-down", &env);
 720         environment_exit(&env);
 721
 722         if (devops.disable)
 723                 devops.disable();
 724 }
 725
 726 /*
 727   Configure node_t myself and set up the local sockets (listen only)
 728 */
 729 static bool setup_myself(void) {
 730         char *name, *hostname, *cipher, *digest, *type;
 731         char *address = NULL;
 732         bool port_specified = false;
 733
 734         if(!(name = get_name())) {
 735                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 736                 return false;
 737         }
 738
 739         myname = xstrdup(name);
 740         myself = new_node();
 741         myself->connection = new_connection();
 742         myself->name = name;
 743         myself->connection->name = xstrdup(name);
 744         read_host_config(config_tree, name);
 745
 746         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 747                 myport = xstrdup("655");
 748         else
 749                 port_specified = true;
 750
 751         myself->connection->options = 0;
 752         myself->connection->protocol_major = PROT_MAJOR;
 753         myself->connection->protocol_minor = PROT_MINOR;
 754
 755         myself->options |= PROT_MINOR << 24;
 756
 757 #ifdef DISABLE_LEGACY
 758         experimental = read_ecdsa_private_key();
 759         if(!experimental) {
 760                 logger(DEBUG_ALWAYS, LOG_ERR, "No private key available, cannot start tinc!");
 761                 return false;
 762         }
 763 #else
 764         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 765                 experimental = read_ecdsa_private_key();
 766                 if(!experimental)
 767                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 768         } else {
 769                 if(experimental && !read_ecdsa_private_key())
 770                         return false;
 771         }
 772
 773         if(!read_rsa_private_key()) {
 774                 if(experimental) {
 775                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for legacy protocol disabled.");
 776                 } else {
 777                         logger(DEBUG_ALWAYS, LOG_ERR, "No private keys available, cannot start tinc!");
 778                         return false;
 779                 }
 780         }
 781 #endif
 782
 783         /* Ensure myport is numeric */
 784
 785         if(!atoi(myport)) {
 786                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 787                 sockaddr_t sa;
 788                 if(!ai || !ai->ai_addr)
 789                         return false;
 790                 free(myport);
 791                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 792                 sockaddr2str(&sa, NULL, &myport);
 793         }
 794
 795         /* Read in all the subnets specified in the host configuration file */
 796
 797         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 798                 subnet_t *subnet;
 799
 800                 if(!get_config_subnet(cfg, &subnet))
 801                         return false;
 802
 803                 subnet_add(myself, subnet);
 804         }
 805
 806         /* Check some options */
 807
 808         if(!setup_myself_reloadable())
 809                 return false;
 810
 811         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 812         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 813         strictsubnets |= tunnelserver;
 814
 815         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 816                 if(max_connection_burst <= 0) {
 817                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 818                         return false;
 819                 }
 820         }
 821
 822         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 823                 if(udp_rcvbuf < 0) {
 824                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 825                         return false;
 826                 }
 827         }
 828
 829         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 830                 if(udp_sndbuf < 0) {
 831                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 832                         return false;
 833                 }
 834         }
 835
 836         int replaywin_int;
 837         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 838                 if(replaywin_int < 0) {
 839                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 840                         return false;
 841                 }
 842                 replaywin = (unsigned)replaywin_int;
 843                 sptps_replaywin = replaywin;
 844         }
 845
 846 #ifndef DISABLE_LEGACY
 847         /* Generate packet encryption key */
 848
 849         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 850                 cipher = xstrdup("aes-256-cbc");
 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("sha256");
 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 #endif
 885
 886         /* Compression */
 887
 888         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 889                 if(myself->incompression < 0 || myself->incompression > 11) {
 890                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 891                         return false;
 892                 }
 893         } else
 894                 myself->incompression = 0;
 895
 896         myself->connection->outcompression = 0;
 897
 898         /* Done */
 899
 900         myself->nexthop = myself;
 901         myself->via = myself;
 902         myself->status.reachable = true;
 903         myself->last_state_change = now.tv_sec;
 904         myself->status.sptps = experimental;
 905         node_add(myself);
 906
 907         graph();
 908
 909         load_all_nodes();
 910
 911         /* Open device */
 912
 913         devops = os_devops;
 914
 915         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 916                 if(!strcasecmp(type, "dummy"))
 917                         devops = dummy_devops;
 918                 else if(!strcasecmp(type, "raw_socket"))
 919                         devops = raw_socket_devops;
 920                 else if(!strcasecmp(type, "multicast"))
 921                         devops = multicast_devops;
 922                 else if(!strcasecmp(type, "fd"))
 923                         devops = fd_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                 free(type);
 933         }
 934
 935         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
 936
 937         if(!devops.setup())
 938                 return false;
 939
 940         if(device_fd >= 0)
 941                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 942
 943         /* Open sockets */
 944
 945         if(!do_detach && getenv("LISTEN_FDS")) {
 946                 sockaddr_t sa;
 947                 socklen_t salen;
 948
 949                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 950 #ifdef HAVE_UNSETENV
 951                 unsetenv("LISTEN_FDS");
 952 #endif
 953
 954                 if(listen_sockets > MAXSOCKETS) {
 955                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 956                         return false;
 957                 }
 958
 959                 for(int i = 0; i < listen_sockets; i++) {
 960                         salen = sizeof(sa);
 961                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 962                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
 963                                 return false;
 964                         }
 965
 966 #ifdef FD_CLOEXEC
 967                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 968 #endif
 969
 970                         int udp_fd = setup_vpn_in_socket(&sa);
 971                         if(udp_fd < 0)
 972                                 return false;
 973
 974                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
 975                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
 976
 977                         if(debug_level >= DEBUG_CONNECTIONS) {
 978                                 hostname = sockaddr2hostname(&sa);
 979                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 980                                 free(hostname);
 981                         }
 982
 983                         memcpy(&listen_socket[i].sa, &sa, salen);
 984                 }
 985         } else {
 986                 listen_sockets = 0;
 987                 int cfgs = 0;
 988
 989                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 990                         cfgs++;
 991                         get_config_string(cfg, &address);
 992                         if(!add_listen_address(address, true))
 993                                 return false;
 994                 }
 995
 996                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 997                         cfgs++;
 998                         get_config_string(cfg, &address);
 999                         if(!add_listen_address(address, false))
1000                                 return false;
1001                 }
1002
1003                 if(!cfgs)
1004                         if(!add_listen_address(address, NULL))
1005                                 return false;
1006         }
1007
1008         if(!listen_sockets) {
1009                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1010                 return false;
1011         }
1012
1013         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1014
1015         if(!port_specified || atoi(myport) == 0) {
1016                 sockaddr_t sa;
1017                 socklen_t salen = sizeof(sa);
1018                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1019                         free(myport);
1020                         sockaddr2str(&sa, NULL, &myport);
1021                         if(!myport)
1022                                 myport = xstrdup("655");
1023                 }
1024         }
1025
1026         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1027         myself->connection->hostname = xstrdup(myself->hostname);
1028
1029         char *upnp = NULL;
1030         get_config_string(lookup_config(config_tree, "UPnP"), &upnp);
1031         bool upnp_tcp = false;
1032         bool upnp_udp = false;
1033         if (upnp) {
1034                 if (!strcasecmp(upnp, "yes"))
1035                         upnp_tcp = upnp_udp = true;
1036                 else if (!strcasecmp(upnp, "udponly"))
1037                         upnp_udp = true;
1038                 free(upnp);
1039         }
1040         if (upnp_tcp || upnp_udp) {
1041 #ifdef HAVE_MINIUPNPC
1042                 upnp_init(upnp_tcp, upnp_udp);
1043 #else
1044                 logger(DEBUG_ALWAYS, LOG_WARNING, "UPnP was requested, but tinc isn't built with miniupnpc support!");
1045 #endif
1046         }
1047
1048         /* Done. */
1049
1050         last_config_check = now.tv_sec;
1051
1052         return true;
1053 }
1054
1055 /*
1056   initialize network
1057 */
1058 bool setup_network(void) {
1059         init_connections();
1060         init_subnets();
1061         init_nodes();
1062         init_edges();
1063         init_requests();
1064
1065         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1066                 if(pinginterval < 1) {
1067                         pinginterval = 86400;
1068                 }
1069         } else
1070                 pinginterval = 60;
1071
1072         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
1073                 pingtimeout = 5;
1074         if(pingtimeout < 1 || pingtimeout > pinginterval)
1075                 pingtimeout = pinginterval;
1076
1077         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
1078                 maxoutbufsize = 10 * MTU;
1079
1080         if(!setup_myself())
1081                 return false;
1082
1083         if(!init_control())
1084                 return false;
1085
1086         if (!device_standby)
1087                 device_enable();
1088
1089         /* Run subnet-up scripts for our own subnets */
1090
1091         subnet_update(myself, NULL, true);
1092
1093         return true;
1094 }
1095
1096 /*
1097   close all open network connections
1098 */
1099 void close_network_connections(void) {
1100         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1101                 next = node->next;
1102                 connection_t *c = node->data;
1103                 /* Keep control connections open until the end, so they know when we really terminated */
1104                 if(c->status.control)
1105                         c->socket = -1;
1106                 c->outgoing = NULL;
1107                 terminate_connection(c, false);
1108         }
1109
1110         if(outgoing_list)
1111                 list_delete_list(outgoing_list);
1112
1113         if(myself && myself->connection) {
1114                 subnet_update(myself, NULL, false);
1115                 connection_del(myself->connection);
1116         }
1117
1118         for(int i = 0; i < listen_sockets; i++) {
1119                 io_del(&listen_socket[i].tcp);
1120                 io_del(&listen_socket[i].udp);
1121                 close(listen_socket[i].tcp.fd);
1122                 close(listen_socket[i].udp.fd);
1123         }
1124
1125         exit_requests();
1126         exit_edges();
1127         exit_subnets();
1128         exit_nodes();
1129         exit_connections();
1130
1131         if (!device_standby)
1132                 device_disable();
1133
1134         free(myport);
1135
1136         if (device_fd >= 0)
1137                 io_del(&device_io);
1138         if (devops.close)
1139                 devops.close();
1140
1141         exit_control();
1142
1143         free(scriptextension);
1144         free(scriptinterpreter);
1145
1146         return;
1147 }