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
  71         splay_tree_t *config_tree;
  72         FILE *fp;
  73         char *pubname = NULL;
  74         char *p;
  75
  76         init_configuration(&config_tree);
  77
  78         if(!read_host_config(config_tree, n->name)) {
  79                 goto exit;
  80         }
  81
  82         /* First, check for simple Ed25519PublicKey statement */
  83
  84         if(get_config_string(lookup_config(config_tree, "Ed25519PublicKey"), &p)) {
  85                 n->ecdsa = ecdsa_set_base64_public_key(p);
  86                 free(p);
  87                 goto exit;
  88         }
  89
  90         /* Else, check for Ed25519PublicKeyFile statement and read it */
  91
  92         if(!get_config_string(lookup_config(config_tree, "Ed25519PublicKeyFile"), &pubname)) {
  93                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  94         }
  95
  96         fp = fopen(pubname, "r");
  97
  98         if(!fp) {
  99                 goto exit;
 100         }
 101
 102         n->ecdsa = ecdsa_read_pem_public_key(fp);
 103         fclose(fp);
 104
 105 exit:
 106         exit_configuration(&config_tree);
 107         free(pubname);
 108         return n->ecdsa;
 109 }
 110
 111 bool read_ecdsa_public_key(connection_t *c) {
 112         if(ecdsa_active(c->ecdsa)) {
 113                 return true;
 114         }
 115
 116         FILE *fp;
 117         char *fname;
 118         char *p;
 119
 120         if(!c->config_tree) {
 121                 init_configuration(&c->config_tree);
 122
 123                 if(!read_host_config(c->config_tree, c->name)) {
 124                         return false;
 125                 }
 126         }
 127
 128         /* First, check for simple Ed25519PublicKey statement */
 129
 130         if(get_config_string(lookup_config(c->config_tree, "Ed25519PublicKey"), &p)) {
 131                 c->ecdsa = ecdsa_set_base64_public_key(p);
 132                 free(p);
 133                 return c->ecdsa;
 134         }
 135
 136         /* Else, check for Ed25519PublicKeyFile statement and read it */
 137
 138         if(!get_config_string(lookup_config(c->config_tree, "Ed25519PublicKeyFile"), &fname)) {
 139                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 140         }
 141
 142         fp = fopen(fname, "r");
 143
 144         if(!fp) {
 145                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 public key file `%s': %s",
 146                        fname, strerror(errno));
 147                 free(fname);
 148                 return false;
 149         }
 150
 151         c->ecdsa = ecdsa_read_pem_public_key(fp);
 152
 153         if(!c->ecdsa && errno != ENOENT) {
 154                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing Ed25519 public key file `%s' failed.", fname);
 155         }
 156
 157         fclose(fp);
 158         free(fname);
 159         return c->ecdsa;
 160 }
 161
 162 #ifndef DISABLE_LEGACY
 163 bool read_rsa_public_key(connection_t *c) {
 164         FILE *fp;
 165         char *fname;
 166         char *n;
 167
 168         /* First, check for simple PublicKey statement */
 169
 170         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 171                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 172                 free(n);
 173                 return c->rsa;
 174         }
 175
 176         /* Else, check for PublicKeyFile statement and read it */
 177
 178         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) {
 179                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 180         }
 181
 182         fp = fopen(fname, "r");
 183
 184         if(!fp) {
 185                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 186                 free(fname);
 187                 return false;
 188         }
 189
 190         c->rsa = rsa_read_pem_public_key(fp);
 191         fclose(fp);
 192
 193         if(!c->rsa) {
 194                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 195         }
 196
 197         free(fname);
 198         return c->rsa;
 199 }
 200 #endif
 201
 202 static bool read_ecdsa_private_key(void) {
 203         FILE *fp;
 204         char *fname;
 205
 206         /* Check for PrivateKeyFile statement and read it */
 207
 208         if(!get_config_string(lookup_config(config_tree, "Ed25519PrivateKeyFile"), &fname)) {
 209                 xasprintf(&fname, "%s" SLASH "ed25519_key.priv", confbase);
 210         }
 211
 212         fp = fopen(fname, "r");
 213
 214         if(!fp) {
 215                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 private key file `%s': %s", fname, strerror(errno));
 216
 217                 if(errno == ENOENT) {
 218                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an Ed25519 keypair with `tinc -n %s generate-ed25519-keys'.", netname ? : ".");
 219                 }
 220
 221                 free(fname);
 222                 return false;
 223         }
 224
 225 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 226         struct stat s;
 227
 228         if(fstat(fileno(fp), &s)) {
 229                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat Ed25519 private key file `%s': %s'", fname, strerror(errno));
 230                 free(fname);
 231                 return false;
 232         }
 233
 234         if(s.st_mode & ~0100700) {
 235                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for Ed25519 private key file `%s'!", fname);
 236         }
 237
 238 #endif
 239
 240         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 241         fclose(fp);
 242
 243         if(!myself->connection->ecdsa) {
 244                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 245         }
 246
 247         free(fname);
 248         return myself->connection->ecdsa;
 249 }
 250
 251 static bool read_invitation_key(void) {
 252         FILE *fp;
 253         char fname[PATH_MAX];
 254
 255         if(invitation_key) {
 256                 ecdsa_free(invitation_key);
 257                 invitation_key = NULL;
 258         }
 259
 260         snprintf(fname, sizeof(fname), "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
 261
 262         fp = fopen(fname, "r");
 263
 264         if(fp) {
 265                 invitation_key = ecdsa_read_pem_private_key(fp);
 266                 fclose(fp);
 267
 268                 if(!invitation_key) {
 269                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 270                 }
 271         }
 272
 273         return invitation_key;
 274 }
 275
 276 #ifndef DISABLE_LEGACY
 277 static bool read_rsa_private_key(void) {
 278         FILE *fp;
 279         char *fname;
 280         char *n, *d;
 281
 282         /* First, check for simple PrivateKey statement */
 283
 284         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 285                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 286                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 287                         free(d);
 288                         return false;
 289                 }
 290
 291                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 292                 free(n);
 293                 free(d);
 294                 return myself->connection->rsa;
 295         }
 296
 297         /* Else, check for PrivateKeyFile statement and read it */
 298
 299         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname)) {
 300                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 301         }
 302
 303         fp = fopen(fname, "r");
 304
 305         if(!fp) {
 306                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 307                        fname, strerror(errno));
 308
 309                 if(errno == ENOENT) {
 310                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an RSA keypair with `tinc -n %s generate-rsa-keys'.", netname ? : ".");
 311                 }
 312
 313                 free(fname);
 314                 return false;
 315         }
 316
 317 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 318         struct stat s;
 319
 320         if(fstat(fileno(fp), &s)) {
 321                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 322                 free(fname);
 323                 return false;
 324         }
 325
 326         if(s.st_mode & ~0100700) {
 327                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 328         }
 329
 330 #endif
 331
 332         myself->connection->rsa = rsa_read_pem_private_key(fp);
 333         fclose(fp);
 334
 335         if(!myself->connection->rsa) {
 336                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 337         }
 338
 339         free(fname);
 340         return myself->connection->rsa;
 341 }
 342 #endif
 343
 344 static timeout_t keyexpire_timeout;
 345
 346 static void keyexpire_handler(void *data) {
 347         regenerate_key();
 348         timeout_set(data, &(struct timeval) {
 349                 keylifetime, rand() % 100000
 350         });
 351 }
 352
 353 void regenerate_key(void) {
 354         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 355         send_key_changed();
 356
 357         for splay_each(node_t, n, node_tree) {
 358                 n->status.validkey_in = false;
 359         }
 360 }
 361
 362 void load_all_nodes(void) {
 363         DIR *dir;
 364         struct dirent *ent;
 365         char dname[PATH_MAX];
 366
 367         snprintf(dname, sizeof(dname), "%s" SLASH "hosts", confbase);
 368         dir = opendir(dname);
 369
 370         if(!dir) {
 371                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 372                 return;
 373         }
 374
 375         while((ent = readdir(dir))) {
 376                 if(!check_id(ent->d_name)) {
 377                         continue;
 378                 }
 379
 380                 node_t *n = lookup_node(ent->d_name);
 381
 382                 splay_tree_t *config_tree;
 383                 init_configuration(&config_tree);
 384                 read_config_options(config_tree, ent->d_name);
 385                 read_host_config(config_tree, ent->d_name);
 386
 387                 if(!n) {
 388                         n = new_node();
 389                         n->name = xstrdup(ent->d_name);
 390                         node_add(n);
 391                 }
 392
 393                 if(strictsubnets) {
 394                         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 395                                 subnet_t *s, *s2;
 396
 397                                 if(!get_config_subnet(cfg, &s)) {
 398                                         continue;
 399                                 }
 400
 401                                 if((s2 = lookup_subnet(n, s))) {
 402                                         s2->expires = -1;
 403                                         free(s);
 404                                 } else {
 405                                         subnet_add(n, s);
 406                                 }
 407                         }
 408                 }
 409
 410                 if(lookup_config(config_tree, "Address")) {
 411                         n->status.has_address = true;
 412                 }
 413
 414                 exit_configuration(&config_tree);
 415         }
 416
 417         closedir(dir);
 418 }
 419
 420 char *get_name(void) {
 421         char *name = NULL;
 422         char *returned_name;
 423
 424         get_config_string(lookup_config(config_tree, "Name"), &name);
 425
 426         if(!name) {
 427                 return NULL;
 428         }
 429
 430         returned_name = replace_name(name);
 431         free(name);
 432         return returned_name;
 433 }
 434
 435 bool setup_myself_reloadable(void) {
 436         char *proxy = NULL;
 437         char *rmode = NULL;
 438         char *fmode = NULL;
 439         char *bmode = NULL;
 440         char *afname = NULL;
 441         char *space;
 442         bool choice;
 443
 444         free(scriptinterpreter);
 445         scriptinterpreter = NULL;
 446         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 447
 448
 449         free(scriptextension);
 450
 451         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension)) {
 452                 scriptextension = xstrdup("");
 453         }
 454
 455         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 456
 457         if(proxy) {
 458                 if((space = strchr(proxy, ' '))) {
 459                         *space++ = 0;
 460                 }
 461
 462                 if(!strcasecmp(proxy, "none")) {
 463                         proxytype = PROXY_NONE;
 464                 } else if(!strcasecmp(proxy, "socks4")) {
 465                         proxytype = PROXY_SOCKS4;
 466                 } else if(!strcasecmp(proxy, "socks4a")) {
 467                         proxytype = PROXY_SOCKS4A;
 468                 } else if(!strcasecmp(proxy, "socks5")) {
 469                         proxytype = PROXY_SOCKS5;
 470                 } else if(!strcasecmp(proxy, "http")) {
 471                         proxytype = PROXY_HTTP;
 472                 } else if(!strcasecmp(proxy, "exec")) {
 473                         proxytype = PROXY_EXEC;
 474                 } else {
 475                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 476                         return false;
 477                 }
 478
 479                 switch(proxytype) {
 480                 case PROXY_NONE:
 481                 default:
 482                         break;
 483
 484                 case PROXY_EXEC:
 485                         if(!space || !*space) {
 486                                 logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 487                                 return false;
 488                         }
 489
 490                         proxyhost =  xstrdup(space);
 491                         break;
 492
 493                 case PROXY_SOCKS4:
 494                 case PROXY_SOCKS4A:
 495                 case PROXY_SOCKS5:
 496                 case PROXY_HTTP:
 497                         proxyhost = space;
 498
 499                         if(space && (space = strchr(space, ' '))) {
 500                                 *space++ = 0, proxyport = space;
 501                         }
 502
 503                         if(space && (space = strchr(space, ' '))) {
 504                                 *space++ = 0, proxyuser = space;
 505                         }
 506
 507                         if(space && (space = strchr(space, ' '))) {
 508                                 *space++ = 0, proxypass = space;
 509                         }
 510
 511                         if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 512                                 logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 513                                 return false;
 514                         }
 515
 516                         proxyhost = xstrdup(proxyhost);
 517                         proxyport = xstrdup(proxyport);
 518
 519                         if(proxyuser && *proxyuser) {
 520                                 proxyuser = xstrdup(proxyuser);
 521                         }
 522
 523                         if(proxypass && *proxypass) {
 524                                 proxypass = xstrdup(proxypass);
 525                         }
 526
 527                         break;
 528                 }
 529
 530                 free(proxy);
 531         }
 532
 533         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice) {
 534                 myself->options |= OPTION_INDIRECT;
 535         }
 536
 537         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice) {
 538                 myself->options |= OPTION_TCPONLY;
 539         }
 540
 541         if(myself->options & OPTION_TCPONLY) {
 542                 myself->options |= OPTION_INDIRECT;
 543         }
 544
 545         get_config_bool(lookup_config(config_tree, "UDPDiscovery"), &udp_discovery);
 546         get_config_int(lookup_config(config_tree, "UDPDiscoveryKeepaliveInterval"), &udp_discovery_keepalive_interval);
 547         get_config_int(lookup_config(config_tree, "UDPDiscoveryInterval"), &udp_discovery_interval);
 548         get_config_int(lookup_config(config_tree, "UDPDiscoveryTimeout"), &udp_discovery_timeout);
 549
 550         get_config_int(lookup_config(config_tree, "MTUInfoInterval"), &mtu_info_interval);
 551         get_config_int(lookup_config(config_tree, "UDPInfoInterval"), &udp_info_interval);
 552
 553         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 554         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 555
 556         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 557                 if(!strcasecmp(rmode, "router")) {
 558                         routing_mode = RMODE_ROUTER;
 559                 } else if(!strcasecmp(rmode, "switch")) {
 560                         routing_mode = RMODE_SWITCH;
 561                 } else if(!strcasecmp(rmode, "hub")) {
 562                         routing_mode = RMODE_HUB;
 563                 } else {
 564                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 565                         return false;
 566                 }
 567
 568                 free(rmode);
 569         }
 570
 571         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 572                 if(!strcasecmp(fmode, "off")) {
 573                         forwarding_mode = FMODE_OFF;
 574                 } else if(!strcasecmp(fmode, "internal")) {
 575                         forwarding_mode = FMODE_INTERNAL;
 576                 } else if(!strcasecmp(fmode, "kernel")) {
 577                         forwarding_mode = FMODE_KERNEL;
 578                 } else {
 579                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 580                         return false;
 581                 }
 582
 583                 free(fmode);
 584         }
 585
 586         choice = !(myself->options & OPTION_TCPONLY);
 587         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 588
 589         if(choice) {
 590                 myself->options |= OPTION_PMTU_DISCOVERY;
 591         }
 592
 593         choice = true;
 594         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 595
 596         if(choice) {
 597                 myself->options |= OPTION_CLAMP_MSS;
 598         }
 599
 600         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 601         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 602
 603         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 604                 if(!strcasecmp(bmode, "no")) {
 605                         broadcast_mode = BMODE_NONE;
 606                 } else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst")) {
 607                         broadcast_mode = BMODE_MST;
 608                 } else if(!strcasecmp(bmode, "direct")) {
 609                         broadcast_mode = BMODE_DIRECT;
 610                 } else {
 611                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 612                         return false;
 613                 }
 614
 615                 free(bmode);
 616         }
 617
 618         const char *const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
 619
 620         for(size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
 621                 subnet_t *s = new_subnet();
 622
 623                 if(!str2net(s, DEFAULT_BROADCAST_SUBNETS[i])) {
 624                         abort();
 625                 }
 626
 627                 subnet_add(NULL, s);
 628         }
 629
 630         for(config_t *cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 631                 subnet_t *s;
 632
 633                 if(!get_config_subnet(cfg, &s)) {
 634                         continue;
 635                 }
 636
 637                 subnet_add(NULL, s);
 638         }
 639
 640 #if !defined(IPPROTO_IP) || !defined(IP_TOS)
 641
 642         if(priorityinheritance) {
 643                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv4 connections", "PriorityInheritance");
 644         }
 645
 646 #endif
 647
 648 #if !defined(IPPROTO_IPV6) || !defined(IPV6_TCLASS)
 649
 650         if(priorityinheritance) {
 651                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv6 connections", "PriorityInheritance");
 652         }
 653
 654 #endif
 655
 656         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire)) {
 657                 macexpire = 600;
 658         }
 659
 660         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 661                 if(maxtimeout <= 0) {
 662                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 663                         return false;
 664                 }
 665         } else {
 666                 maxtimeout = 900;
 667         }
 668
 669         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 670                 if(!strcasecmp(afname, "IPv4")) {
 671                         addressfamily = AF_INET;
 672                 } else if(!strcasecmp(afname, "IPv6")) {
 673                         addressfamily = AF_INET6;
 674                 } else if(!strcasecmp(afname, "any")) {
 675                         addressfamily = AF_UNSPEC;
 676                 } else {
 677                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 678                         return false;
 679                 }
 680
 681                 free(afname);
 682         }
 683
 684         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 685
 686         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime)) {
 687                 keylifetime = 3600;
 688         }
 689
 690         config_t *cfg = lookup_config(config_tree, "AutoConnect");
 691
 692         if(cfg) {
 693                 if(!get_config_bool(cfg, &autoconnect)) {
 694                         // Some backwards compatibility with when this option was an int
 695                         int val = 0;
 696                         get_config_int(cfg, &val);
 697                         autoconnect = val;
 698                 }
 699         }
 700
 701         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 702
 703         if(!get_config_int(lookup_config(config_tree, "InvitationExpire"), &invitation_lifetime)) {
 704                 invitation_lifetime = 604800;        // 1 week
 705         }
 706
 707         read_invitation_key();
 708
 709         return true;
 710 }
 711
 712 /*
 713   Add listening sockets.
 714 */
 715 static bool add_listen_address(char *address, bool bindto) {
 716         char *port = myport;
 717
 718         if(address) {
 719                 char *space = strchr(address, ' ');
 720
 721                 if(space) {
 722                         *space++ = 0;
 723                         port = space;
 724                 }
 725
 726                 if(!strcmp(address, "*")) {
 727                         *address = 0;
 728                 }
 729         }
 730
 731         struct addrinfo *ai, hint = {0};
 732
 733         hint.ai_family = addressfamily;
 734
 735         hint.ai_socktype = SOCK_STREAM;
 736
 737         hint.ai_protocol = IPPROTO_TCP;
 738
 739         hint.ai_flags = AI_PASSIVE;
 740
 741 #if HAVE_DECL_RES_INIT
 742         res_init();
 743
 744 #endif
 745         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 746
 747         free(address);
 748
 749         if(err || !ai) {
 750                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 751                 return false;
 752         }
 753
 754         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 755                 // Ignore duplicate addresses
 756                 bool found = false;
 757
 758                 for(int i = 0; i < listen_sockets; i++)
 759                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 760                                 found = true;
 761                                 break;
 762                         }
 763
 764                 if(found) {
 765                         continue;
 766                 }
 767
 768                 if(listen_sockets >= MAXSOCKETS) {
 769                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 770                         return false;
 771                 }
 772
 773                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 774
 775                 if(tcp_fd < 0) {
 776                         continue;
 777                 }
 778
 779                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 780
 781                 if(udp_fd < 0) {
 782                         close(tcp_fd);
 783                         continue;
 784                 }
 785
 786                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 787                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 788
 789                 if(debug_level >= DEBUG_CONNECTIONS) {
 790                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 791                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 792                         free(hostname);
 793                 }
 794
 795                 listen_socket[listen_sockets].bindto = bindto;
 796                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 797                 listen_sockets++;
 798         }
 799
 800         freeaddrinfo(ai);
 801         return true;
 802 }
 803
 804 void device_enable(void) {
 805         if(devops.enable) {
 806                 devops.enable();
 807         }
 808
 809         /* Run tinc-up script to further initialize the tap interface */
 810
 811         environment_t env;
 812         environment_init(&env);
 813         execute_script("tinc-up", &env);
 814         environment_exit(&env);
 815 }
 816
 817 void device_disable(void) {
 818         environment_t env;
 819         environment_init(&env);
 820         execute_script("tinc-down", &env);
 821         environment_exit(&env);
 822
 823         if(devops.disable) {
 824                 devops.disable();
 825         }
 826 }
 827
 828 /*
 829   Configure node_t myself and set up the local sockets (listen only)
 830 */
 831 static bool setup_myself(void) {
 832         char *name, *hostname, *cipher, *digest, *type;
 833         char *address = NULL;
 834         bool port_specified = false;
 835
 836         if(!(name = get_name())) {
 837                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 838                 return false;
 839         }
 840
 841         myname = xstrdup(name);
 842         myself = new_node();
 843         myself->connection = new_connection();
 844         myself->name = name;
 845         myself->connection->name = xstrdup(name);
 846         read_host_config(config_tree, name);
 847
 848         if(!get_config_string(lookup_config(config_tree, "Port"), &myport)) {
 849                 myport = xstrdup("655");
 850         } else {
 851                 port_specified = true;
 852         }
 853
 854         myself->connection->options = 0;
 855         myself->connection->protocol_major = PROT_MAJOR;
 856         myself->connection->protocol_minor = PROT_MINOR;
 857
 858         myself->options |= PROT_MINOR << 24;
 859
 860 #ifdef DISABLE_LEGACY
 861         experimental = read_ecdsa_private_key();
 862
 863         if(!experimental) {
 864                 logger(DEBUG_ALWAYS, LOG_ERR, "No private key available, cannot start tinc!");
 865                 return false;
 866         }
 867
 868 #else
 869
 870         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 871                 experimental = read_ecdsa_private_key();
 872
 873                 if(!experimental) {
 874                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 875                 }
 876         } else {
 877                 if(experimental && !read_ecdsa_private_key()) {
 878                         return false;
 879                 }
 880         }
 881
 882         if(!read_rsa_private_key()) {
 883                 if(experimental) {
 884                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for legacy protocol disabled.");
 885                 } else {
 886                         logger(DEBUG_ALWAYS, LOG_ERR, "No private keys available, cannot start tinc!");
 887                         return false;
 888                 }
 889         }
 890
 891 #endif
 892
 893         /* Ensure myport is numeric */
 894
 895         if(!atoi(myport)) {
 896                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 897                 sockaddr_t sa;
 898
 899                 if(!ai || !ai->ai_addr) {
 900                         return false;
 901                 }
 902
 903                 free(myport);
 904                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 905                 sockaddr2str(&sa, NULL, &myport);
 906         }
 907
 908         /* Read in all the subnets specified in the host configuration file */
 909
 910         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 911                 subnet_t *subnet;
 912
 913                 if(!get_config_subnet(cfg, &subnet)) {
 914                         return false;
 915                 }
 916
 917                 subnet_add(myself, subnet);
 918         }
 919
 920         /* Check some options */
 921
 922         if(!setup_myself_reloadable()) {
 923                 return false;
 924         }
 925
 926         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 927         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 928         strictsubnets |= tunnelserver;
 929
 930         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 931                 if(max_connection_burst <= 0) {
 932                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 933                         return false;
 934                 }
 935         }
 936
 937         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 938                 if(udp_rcvbuf < 0) {
 939                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 940                         return false;
 941                 }
 942         }
 943
 944         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 945                 if(udp_sndbuf < 0) {
 946                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 947                         return false;
 948                 }
 949         }
 950
 951         int replaywin_int;
 952
 953         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 954                 if(replaywin_int < 0) {
 955                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 956                         return false;
 957                 }
 958
 959                 replaywin = (unsigned)replaywin_int;
 960                 sptps_replaywin = replaywin;
 961         }
 962
 963 #ifndef DISABLE_LEGACY
 964         /* Generate packet encryption key */
 965
 966         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher)) {
 967                 cipher = xstrdup("aes-256-cbc");
 968         }
 969
 970         if(!strcasecmp(cipher, "none")) {
 971                 myself->incipher = NULL;
 972         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 973                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 974                 return false;
 975         }
 976
 977         free(cipher);
 978
 979         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval) {
 980                 keylifetime, rand() % 100000
 981         });
 982
 983         /* Check if we want to use message authentication codes... */
 984
 985         int maclength = 4;
 986         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 987
 988         if(maclength < 0) {
 989                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 990                 return false;
 991         }
 992
 993         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest)) {
 994                 digest = xstrdup("sha256");
 995         }
 996
 997         if(!strcasecmp(digest, "none")) {
 998                 myself->indigest = NULL;
 999         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
1000                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
1001                 return false;
1002         }
1003
1004         free(digest);
1005 #endif
1006
1007         /* Compression */
1008
1009         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
1010                 if(myself->incompression < 0 || myself->incompression > 11) {
1011                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
1012                         return false;
1013                 }
1014         } else {
1015                 myself->incompression = 0;
1016         }
1017
1018         myself->connection->outcompression = 0;
1019
1020         /* Done */
1021
1022         myself->nexthop = myself;
1023         myself->via = myself;
1024         myself->status.reachable = true;
1025         myself->last_state_change = now.tv_sec;
1026         myself->status.sptps = experimental;
1027         node_add(myself);
1028
1029         graph();
1030
1031         load_all_nodes();
1032
1033         /* Open device */
1034
1035         devops = os_devops;
1036
1037         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
1038                 if(!strcasecmp(type, "dummy")) {
1039                         devops = dummy_devops;
1040                 } else if(!strcasecmp(type, "raw_socket")) {
1041                         devops = raw_socket_devops;
1042                 } else if(!strcasecmp(type, "multicast")) {
1043                         devops = multicast_devops;
1044                 } else if(!strcasecmp(type, "fd")) {
1045                         devops = fd_devops;
1046                 }
1047
1048 #ifdef ENABLE_UML
1049                 else if(!strcasecmp(type, "uml")) {
1050                         devops = uml_devops;
1051                 }
1052
1053 #endif
1054 #ifdef ENABLE_VDE
1055                 else if(!strcasecmp(type, "vde")) {
1056                         devops = vde_devops;
1057                 }
1058
1059 #endif
1060                 free(type);
1061         }
1062
1063         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
1064
1065         if(!devops.setup()) {
1066                 return false;
1067         }
1068
1069         if(device_fd >= 0) {
1070                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
1071         }
1072
1073         /* Open sockets */
1074
1075         if(!do_detach && getenv("LISTEN_FDS")) {
1076                 sockaddr_t sa;
1077                 socklen_t salen;
1078
1079                 listen_sockets = atoi(getenv("LISTEN_FDS"));
1080 #ifdef HAVE_UNSETENV
1081                 unsetenv("LISTEN_FDS");
1082 #endif
1083
1084                 if(listen_sockets > MAXSOCKETS) {
1085                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
1086                         return false;
1087                 }
1088
1089                 for(int i = 0; i < listen_sockets; i++) {
1090                         salen = sizeof(sa);
1091
1092                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
1093                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
1094                                 return false;
1095                         }
1096
1097 #ifdef FD_CLOEXEC
1098                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
1099 #endif
1100
1101                         int udp_fd = setup_vpn_in_socket(&sa);
1102
1103                         if(udp_fd < 0) {
1104                                 return false;
1105                         }
1106
1107                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
1108                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
1109
1110                         if(debug_level >= DEBUG_CONNECTIONS) {
1111                                 hostname = sockaddr2hostname(&sa);
1112                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
1113                                 free(hostname);
1114                         }
1115
1116                         memcpy(&listen_socket[i].sa, &sa, salen);
1117                 }
1118         } else {
1119                 listen_sockets = 0;
1120                 int cfgs = 0;
1121
1122                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1123                         cfgs++;
1124                         get_config_string(cfg, &address);
1125
1126                         if(!add_listen_address(address, true)) {
1127                                 return false;
1128                         }
1129                 }
1130
1131                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1132                         cfgs++;
1133                         get_config_string(cfg, &address);
1134
1135                         if(!add_listen_address(address, false)) {
1136                                 return false;
1137                         }
1138                 }
1139
1140                 if(!cfgs)
1141                         if(!add_listen_address(address, NULL)) {
1142                                 return false;
1143                         }
1144         }
1145
1146         if(!listen_sockets) {
1147                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1148                 return false;
1149         }
1150
1151         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1152
1153         if(!port_specified || atoi(myport) == 0) {
1154                 sockaddr_t sa;
1155                 socklen_t salen = sizeof(sa);
1156
1157                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1158                         free(myport);
1159                         sockaddr2str(&sa, NULL, &myport);
1160
1161                         if(!myport) {
1162                                 myport = xstrdup("655");
1163                         }
1164                 }
1165         }
1166
1167         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1168         myself->connection->hostname = xstrdup(myself->hostname);
1169
1170         char *upnp = NULL;
1171         get_config_string(lookup_config(config_tree, "UPnP"), &upnp);
1172         bool upnp_tcp = false;
1173         bool upnp_udp = false;
1174
1175         if(upnp) {
1176                 if(!strcasecmp(upnp, "yes")) {
1177                         upnp_tcp = upnp_udp = true;
1178                 } else if(!strcasecmp(upnp, "udponly")) {
1179                         upnp_udp = true;
1180                 }
1181
1182                 free(upnp);
1183         }
1184
1185         if(upnp_tcp || upnp_udp) {
1186 #ifdef HAVE_MINIUPNPC
1187                 upnp_init(upnp_tcp, upnp_udp);
1188 #else
1189                 logger(DEBUG_ALWAYS, LOG_WARNING, "UPnP was requested, but tinc isn't built with miniupnpc support!");
1190 #endif
1191         }
1192
1193         /* Done. */
1194
1195         last_config_check = now.tv_sec;
1196
1197         return true;
1198 }
1199
1200 /*
1201   initialize network
1202 */
1203 bool setup_network(void) {
1204         init_connections();
1205         init_subnets();
1206         init_nodes();
1207         init_edges();
1208         init_requests();
1209
1210         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1211                 if(pinginterval < 1) {
1212                         pinginterval = 86400;
1213                 }
1214         } else {
1215                 pinginterval = 60;
1216         }
1217
1218         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout)) {
1219                 pingtimeout = 5;
1220         }
1221
1222         if(pingtimeout < 1 || pingtimeout > pinginterval) {
1223                 pingtimeout = pinginterval;
1224         }
1225
1226         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize)) {
1227                 maxoutbufsize = 10 * MTU;
1228         }
1229
1230         if(!setup_myself()) {
1231                 return false;
1232         }
1233
1234         if(!init_control()) {
1235                 return false;
1236         }
1237
1238         if(!device_standby) {
1239                 device_enable();
1240         }
1241
1242         /* Run subnet-up scripts for our own subnets */
1243
1244         subnet_update(myself, NULL, true);
1245
1246         return true;
1247 }
1248
1249 /*
1250   close all open network connections
1251 */
1252 void close_network_connections(void) {
1253         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1254                 next = node->next;
1255                 connection_t *c = node->data;
1256
1257                 /* Keep control connections open until the end, so they know when we really terminated */
1258                 if(c->status.control) {
1259                         c->socket = -1;
1260                 }
1261
1262                 c->outgoing = NULL;
1263                 terminate_connection(c, false);
1264         }
1265
1266         if(outgoing_list) {
1267                 list_delete_list(outgoing_list);
1268         }
1269
1270         if(myself && myself->connection) {
1271                 subnet_update(myself, NULL, false);
1272                 connection_del(myself->connection);
1273         }
1274
1275         for(int i = 0; i < listen_sockets; i++) {
1276                 io_del(&listen_socket[i].tcp);
1277                 io_del(&listen_socket[i].udp);
1278                 close(listen_socket[i].tcp.fd);
1279                 close(listen_socket[i].udp.fd);
1280         }
1281
1282         exit_requests();
1283         exit_edges();
1284         exit_subnets();
1285         exit_nodes();
1286         exit_connections();
1287
1288         if(!device_standby) {
1289                 device_disable();
1290         }
1291
1292         free(myport);
1293
1294         if(device_fd >= 0) {
1295                 io_del(&device_io);
1296         }
1297
1298         if(devops.close) {
1299                 devops.close();
1300         }
1301
1302         exit_control();
1303
1304         free(scriptextension);
1305         free(scriptinterpreter);
1306
1307         return;
1308 }