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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2014 Guus Sliepen <guus@tinc-vpn.org>
   5                   2006      Scott Lamb <slamb@slamb.org>
   6                   2010      Brandon Black <blblack@gmail.com>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License along
  19     with this program; if not, write to the Free Software Foundation, Inc.,
  20     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21 */
  22
  23 #include "system.h"
  24
  25 #include "cipher.h"
  26 #include "conf.h"
  27 #include "connection.h"
  28 #include "control.h"
  29 #include "device.h"
  30 #include "digest.h"
  31 #include "ecdsa.h"
  32 #include "graph.h"
  33 #include "logger.h"
  34 #include "names.h"
  35 #include "net.h"
  36 #include "netutl.h"
  37 #include "process.h"
  38 #include "protocol.h"
  39 #include "route.h"
  40 #include "rsa.h"
  41 #include "script.h"
  42 #include "subnet.h"
  43 #include "utils.h"
  44 #include "xalloc.h"
  45
  46 char *myport;
  47 static char *myname;
  48 static io_t device_io;
  49 devops_t devops;
  50 bool device_standby = false;
  51
  52 char *proxyhost;
  53 char *proxyport;
  54 char *proxyuser;
  55 char *proxypass;
  56 proxytype_t proxytype;
  57 bool autoconnect;
  58 bool disablebuggypeers;
  59
  60 char *scriptinterpreter;
  61 char *scriptextension;
  62
  63 bool node_read_ecdsa_public_key(node_t *n) {
  64         if(ecdsa_active(n->ecdsa))
  65                 return true;
  66
  67         splay_tree_t *config_tree;
  68         FILE *fp;
  69         char *pubname = NULL;
  70         char *p;
  71
  72         init_configuration(&config_tree);
  73         if(!read_host_config(config_tree, n->name))
  74                 goto exit;
  75
  76         /* First, check for simple Ed25519PublicKey statement */
  77
  78         if(get_config_string(lookup_config(config_tree, "Ed25519PublicKey"), &p)) {
  79                 n->ecdsa = ecdsa_set_base64_public_key(p);
  80                 free(p);
  81                 goto exit;
  82         }
  83
  84         /* Else, check for Ed25519PublicKeyFile statement and read it */
  85
  86         if(!get_config_string(lookup_config(config_tree, "Ed25519PublicKeyFile"), &pubname))
  87                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  88
  89         fp = fopen(pubname, "r");
  90
  91         if(!fp)
  92                 goto exit;
  93
  94         n->ecdsa = ecdsa_read_pem_public_key(fp);
  95         fclose(fp);
  96
  97 exit:
  98         exit_configuration(&config_tree);
  99         free(pubname);
 100         return n->ecdsa;
 101 }
 102
 103 bool read_ecdsa_public_key(connection_t *c) {
 104         if(ecdsa_active(c->ecdsa))
 105                 return true;
 106
 107         FILE *fp;
 108         char *fname;
 109         char *p;
 110
 111         if(!c->config_tree) {
 112                 init_configuration(&c->config_tree);
 113                 if(!read_host_config(c->config_tree, c->name))
 114                         return false;
 115         }
 116
 117         /* First, check for simple Ed25519PublicKey statement */
 118
 119         if(get_config_string(lookup_config(c->config_tree, "Ed25519PublicKey"), &p)) {
 120                 c->ecdsa = ecdsa_set_base64_public_key(p);
 121                 free(p);
 122                 return c->ecdsa;
 123         }
 124
 125         /* Else, check for Ed25519PublicKeyFile statement and read it */
 126
 127         if(!get_config_string(lookup_config(c->config_tree, "Ed25519PublicKeyFile"), &fname))
 128                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 129
 130         fp = fopen(fname, "r");
 131
 132         if(!fp) {
 133                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 public key file `%s': %s",
 134                            fname, strerror(errno));
 135                 free(fname);
 136                 return false;
 137         }
 138
 139         c->ecdsa = ecdsa_read_pem_public_key(fp);
 140         fclose(fp);
 141
 142         if(!c->ecdsa)
 143                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing Ed25519 public key file `%s' failed.", fname);
 144         free(fname);
 145         return c->ecdsa;
 146 }
 147
 148 #ifndef DISABLE_LEGACY
 149 bool read_rsa_public_key(connection_t *c) {
 150         if(ecdsa_active(c->ecdsa))
 151                 return true;
 152
 153         FILE *fp;
 154         char *fname;
 155         char *n;
 156
 157         /* First, check for simple PublicKey statement */
 158
 159         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 160                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 161                 free(n);
 162                 return c->rsa;
 163         }
 164
 165         /* Else, check for PublicKeyFile statement and read it */
 166
 167         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 168                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 169
 170         fp = fopen(fname, "r");
 171
 172         if(!fp) {
 173                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 174                 free(fname);
 175                 return false;
 176         }
 177
 178         c->rsa = rsa_read_pem_public_key(fp);
 179         fclose(fp);
 180
 181         if(!c->rsa)
 182                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 183         free(fname);
 184         return c->rsa;
 185 }
 186 #endif
 187
 188 static bool read_ecdsa_private_key(void) {
 189         FILE *fp;
 190         char *fname;
 191
 192         /* Check for PrivateKeyFile statement and read it */
 193
 194         if(!get_config_string(lookup_config(config_tree, "Ed25519PrivateKeyFile"), &fname))
 195                 xasprintf(&fname, "%s" SLASH "ed25519_key.priv", confbase);
 196
 197         fp = fopen(fname, "r");
 198
 199         if(!fp) {
 200                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 private key file `%s': %s", fname, strerror(errno));
 201                 if(errno == ENOENT)
 202                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an Ed25519 keypair with `tinc -n %s generate-ed25519-keys'.", netname ?: ".");
 203                 free(fname);
 204                 return false;
 205         }
 206
 207 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 208         struct stat s;
 209
 210         if(fstat(fileno(fp), &s)) {
 211                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat Ed25519 private key file `%s': %s'", fname, strerror(errno));
 212                 free(fname);
 213                 return false;
 214         }
 215
 216         if(s.st_mode & ~0100700)
 217                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for Ed25519 private key file `%s'!", fname);
 218 #endif
 219
 220         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 221         fclose(fp);
 222
 223         if(!myself->connection->ecdsa)
 224                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 225         free(fname);
 226         return myself->connection->ecdsa;
 227 }
 228
 229 static bool read_invitation_key(void) {
 230         FILE *fp;
 231         char *fname;
 232
 233         if(invitation_key) {
 234                 ecdsa_free(invitation_key);
 235                 invitation_key = NULL;
 236         }
 237
 238         xasprintf(&fname, "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
 239
 240         fp = fopen(fname, "r");
 241
 242         if(fp) {
 243                 invitation_key = ecdsa_read_pem_private_key(fp);
 244                 fclose(fp);
 245                 if(!invitation_key)
 246                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 247         }
 248
 249         free(fname);
 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 }
 323
 324 /*
 325   Read Subnets from all host config files
 326 */
 327 void load_all_subnets(void) {
 328         DIR *dir;
 329         struct dirent *ent;
 330         char *dname;
 331
 332         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 333         dir = opendir(dname);
 334         if(!dir) {
 335                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 336                 free(dname);
 337                 return;
 338         }
 339
 340         while((ent = readdir(dir))) {
 341                 if(!check_id(ent->d_name))
 342                         continue;
 343
 344                 node_t *n = lookup_node(ent->d_name);
 345                 #ifdef _DIRENT_HAVE_D_TYPE
 346                 //if(ent->d_type != DT_REG)
 347                 //      continue;
 348                 #endif
 349
 350                 splay_tree_t *config_tree;
 351                 init_configuration(&config_tree);
 352                 read_config_options(config_tree, ent->d_name);
 353                 read_host_config(config_tree, ent->d_name);
 354
 355                 if(!n) {
 356                         n = new_node();
 357                         n->name = xstrdup(ent->d_name);
 358                         node_add(n);
 359                 }
 360
 361                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 362                         subnet_t *s, *s2;
 363
 364                         if(!get_config_subnet(cfg, &s))
 365                                 continue;
 366
 367                         if((s2 = lookup_subnet(n, s))) {
 368                                 s2->expires = -1;
 369                         } else {
 370                                 subnet_add(n, s);
 371                         }
 372                 }
 373
 374                 exit_configuration(&config_tree);
 375         }
 376
 377         closedir(dir);
 378 }
 379
 380 void load_all_nodes(void) {
 381         DIR *dir;
 382         struct dirent *ent;
 383         char *dname;
 384
 385         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 386         dir = opendir(dname);
 387         if(!dir) {
 388                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 389                 free(dname);
 390                 return;
 391         }
 392
 393         while((ent = readdir(dir))) {
 394                 if(!check_id(ent->d_name))
 395                         continue;
 396
 397                 node_t *n = lookup_node(ent->d_name);
 398                 if(n)
 399                         continue;
 400
 401                 n = new_node();
 402                 n->name = xstrdup(ent->d_name);
 403                 node_add(n);
 404         }
 405
 406         closedir(dir);
 407 }
 408
 409
 410 char *get_name(void) {
 411         char *name = NULL;
 412         char *returned_name;
 413
 414         get_config_string(lookup_config(config_tree, "Name"), &name);
 415
 416         if(!name)
 417                 return NULL;
 418
 419         returned_name = replace_name(name);
 420         free(name);
 421         return returned_name;
 422 }
 423
 424 bool setup_myself_reloadable(void) {
 425         char *proxy = NULL;
 426         char *rmode = NULL;
 427         char *fmode = NULL;
 428         char *bmode = NULL;
 429         char *afname = NULL;
 430         char *space;
 431         bool choice;
 432
 433         free(scriptinterpreter);
 434         scriptinterpreter = NULL;
 435         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 436
 437
 438         free(scriptextension);
 439         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 440                 scriptextension = xstrdup("");
 441
 442         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 443         if(proxy) {
 444                 if((space = strchr(proxy, ' ')))
 445                         *space++ = 0;
 446
 447                 if(!strcasecmp(proxy, "none")) {
 448                         proxytype = PROXY_NONE;
 449                 } else if(!strcasecmp(proxy, "socks4")) {
 450                         proxytype = PROXY_SOCKS4;
 451                 } else if(!strcasecmp(proxy, "socks4a")) {
 452                         proxytype = PROXY_SOCKS4A;
 453                 } else if(!strcasecmp(proxy, "socks5")) {
 454                         proxytype = PROXY_SOCKS5;
 455                 } else if(!strcasecmp(proxy, "http")) {
 456                         proxytype = PROXY_HTTP;
 457                 } else if(!strcasecmp(proxy, "exec")) {
 458                         proxytype = PROXY_EXEC;
 459                 } else {
 460                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 461                         return false;
 462                 }
 463
 464                 switch(proxytype) {
 465                         case PROXY_NONE:
 466                         default:
 467                                 break;
 468
 469                         case PROXY_EXEC:
 470                                 if(!space || !*space) {
 471                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 472                                         return false;
 473                                 }
 474                                 proxyhost =  xstrdup(space);
 475                                 break;
 476
 477                         case PROXY_SOCKS4:
 478                         case PROXY_SOCKS4A:
 479                         case PROXY_SOCKS5:
 480                         case PROXY_HTTP:
 481                                 proxyhost = space;
 482                                 if(space && (space = strchr(space, ' ')))
 483                                         *space++ = 0, proxyport = space;
 484                                 if(space && (space = strchr(space, ' ')))
 485                                         *space++ = 0, proxyuser = space;
 486                                 if(space && (space = strchr(space, ' ')))
 487                                         *space++ = 0, proxypass = space;
 488                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 489                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 490                                         return false;
 491                                 }
 492                                 proxyhost = xstrdup(proxyhost);
 493                                 proxyport = xstrdup(proxyport);
 494                                 if(proxyuser && *proxyuser)
 495                                         proxyuser = xstrdup(proxyuser);
 496                                 if(proxypass && *proxypass)
 497                                         proxypass = xstrdup(proxypass);
 498                                 break;
 499                 }
 500
 501                 free(proxy);
 502         }
 503
 504         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 505                 myself->options |= OPTION_INDIRECT;
 506
 507         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 508                 myself->options |= OPTION_TCPONLY;
 509
 510         if(myself->options & OPTION_TCPONLY)
 511                 myself->options |= OPTION_INDIRECT;
 512
 513         get_config_bool(lookup_config(config_tree, "UDPDiscovery"), &udp_discovery);
 514         get_config_int(lookup_config(config_tree, "UDPDiscoveryKeepaliveInterval"), &udp_discovery_keepalive_interval);
 515         get_config_int(lookup_config(config_tree, "UDPDiscoveryInterval"), &udp_discovery_interval);
 516         get_config_int(lookup_config(config_tree, "UDPDiscoveryTimeout"), &udp_discovery_timeout);
 517
 518         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 519         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 520
 521         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 522                 if(!strcasecmp(rmode, "router"))
 523                         routing_mode = RMODE_ROUTER;
 524                 else if(!strcasecmp(rmode, "switch"))
 525                         routing_mode = RMODE_SWITCH;
 526                 else if(!strcasecmp(rmode, "hub"))
 527                         routing_mode = RMODE_HUB;
 528                 else {
 529                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 530                         return false;
 531                 }
 532                 free(rmode);
 533         }
 534
 535         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 536                 if(!strcasecmp(fmode, "off"))
 537                         forwarding_mode = FMODE_OFF;
 538                 else if(!strcasecmp(fmode, "internal"))
 539                         forwarding_mode = FMODE_INTERNAL;
 540                 else if(!strcasecmp(fmode, "kernel"))
 541                         forwarding_mode = FMODE_KERNEL;
 542                 else {
 543                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 544                         return false;
 545                 }
 546                 free(fmode);
 547         }
 548
 549         choice = true;
 550         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 551         if(choice)
 552                 myself->options |= OPTION_PMTU_DISCOVERY;
 553
 554         choice = true;
 555         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 556         if(choice)
 557                 myself->options |= OPTION_CLAMP_MSS;
 558
 559         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 560         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 561         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 562                 if(!strcasecmp(bmode, "no"))
 563                         broadcast_mode = BMODE_NONE;
 564                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 565                         broadcast_mode = BMODE_MST;
 566                 else if(!strcasecmp(bmode, "direct"))
 567                         broadcast_mode = BMODE_DIRECT;
 568                 else {
 569                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 570                         return false;
 571                 }
 572                 free(bmode);
 573         }
 574
 575         const char* const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
 576         for (size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
 577                 subnet_t *s = new_subnet();
 578                 if (!str2net(s, DEFAULT_BROADCAST_SUBNETS[i]))
 579                         abort();
 580                 subnet_add(NULL, s);
 581         }
 582         for (config_t* cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 583                 subnet_t *s;
 584                 if (!get_config_subnet(cfg, &s))
 585                         continue;
 586                 subnet_add(NULL, s);
 587         }
 588
 589 #if !defined(SOL_IP) || !defined(IP_TOS)
 590         if(priorityinheritance)
 591                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 592 #endif
 593
 594         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 595                 macexpire = 600;
 596
 597         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 598                 if(maxtimeout <= 0) {
 599                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 600                         return false;
 601                 }
 602         } else
 603                 maxtimeout = 900;
 604
 605         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 606                 if(!strcasecmp(afname, "IPv4"))
 607                         addressfamily = AF_INET;
 608                 else if(!strcasecmp(afname, "IPv6"))
 609                         addressfamily = AF_INET6;
 610                 else if(!strcasecmp(afname, "any"))
 611                         addressfamily = AF_UNSPEC;
 612                 else {
 613                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 614                         return false;
 615                 }
 616                 free(afname);
 617         }
 618
 619         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 620
 621         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 622                 keylifetime = 3600;
 623
 624         config_t *cfg = lookup_config(config_tree, "AutoConnect");
 625         if(cfg) {
 626                 if(!get_config_bool(cfg, &autoconnect)) {
 627                         // Some backwards compatibility with when this option was an int
 628                         int val = 0;
 629                         get_config_int(cfg, &val);
 630                         autoconnect = val;
 631                 }
 632         }
 633
 634         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 635
 636         read_invitation_key();
 637
 638         return true;
 639 }
 640
 641 /*
 642   Add listening sockets.
 643 */
 644 static bool add_listen_address(char *address, bool bindto) {
 645         char *port = myport;
 646
 647         if(address) {
 648                 char *space = strchr(address, ' ');
 649                 if(space) {
 650                         *space++ = 0;
 651                         port = space;
 652                 }
 653
 654                 if(!strcmp(address, "*"))
 655                         *address = 0;
 656         }
 657
 658         struct addrinfo *ai, hint = {0};
 659         hint.ai_family = addressfamily;
 660         hint.ai_socktype = SOCK_STREAM;
 661         hint.ai_protocol = IPPROTO_TCP;
 662         hint.ai_flags = AI_PASSIVE;
 663
 664         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 665         free(address);
 666
 667         if(err || !ai) {
 668                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 669                 return false;
 670         }
 671
 672         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 673                 // Ignore duplicate addresses
 674                 bool found = false;
 675
 676                 for(int i = 0; i < listen_sockets; i++)
 677                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 678                                 found = true;
 679                                 break;
 680                         }
 681
 682                 if(found)
 683                         continue;
 684
 685                 if(listen_sockets >= MAXSOCKETS) {
 686                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 687                         return false;
 688                 }
 689
 690                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 691
 692                 if(tcp_fd < 0)
 693                         continue;
 694
 695                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 696
 697                 if(tcp_fd < 0) {
 698                         close(tcp_fd);
 699                         continue;
 700                 }
 701
 702                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 703                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 704
 705                 if(debug_level >= DEBUG_CONNECTIONS) {
 706                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 707                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 708                         free(hostname);
 709                 }
 710
 711                 listen_socket[listen_sockets].bindto = bindto;
 712                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 713                 listen_sockets++;
 714         }
 715
 716         freeaddrinfo(ai);
 717         return true;
 718 }
 719
 720 void device_enable(void) {
 721         if (devops.enable)
 722                 devops.enable();
 723
 724         /* Run tinc-up script to further initialize the tap interface */
 725
 726         char *envp[5] = {NULL};
 727         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 728         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 729         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 730         xasprintf(&envp[3], "NAME=%s", myname);
 731
 732         execute_script("tinc-up", envp);
 733
 734         for(int i = 0; i < 4; i++)
 735                 free(envp[i]);
 736 }
 737
 738 void device_disable(void) {
 739         char *envp[5] = {NULL};
 740         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 741         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 742         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 743         xasprintf(&envp[3], "NAME=%s", myname);
 744
 745         execute_script("tinc-down", envp);
 746
 747         for(int i = 0; i < 4; i++)
 748                 free(envp[i]);
 749
 750         if (devops.disable)
 751                 devops.disable();
 752 }
 753
 754 /*
 755   Configure node_t myself and set up the local sockets (listen only)
 756 */
 757 static bool setup_myself(void) {
 758         char *name, *hostname, *cipher, *digest, *type;
 759         char *address = NULL;
 760         bool port_specified = false;
 761
 762         if(!(name = get_name())) {
 763                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 764                 return false;
 765         }
 766
 767         myname = xstrdup(name);
 768         myself = new_node();
 769         myself->connection = new_connection();
 770         myself->name = name;
 771         myself->connection->name = xstrdup(name);
 772         read_host_config(config_tree, name);
 773
 774         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 775                 myport = xstrdup("655");
 776         else
 777                 port_specified = true;
 778
 779         myself->connection->options = 0;
 780         myself->connection->protocol_major = PROT_MAJOR;
 781         myself->connection->protocol_minor = PROT_MINOR;
 782
 783         myself->options |= PROT_MINOR << 24;
 784
 785 #ifdef DISABLE_LEGACY
 786         experimental = read_ecdsa_private_key();
 787         if(!experimental) {
 788                 logger(DEBUG_ALWAYS, LOG_ERR, "No private key available, cannot start tinc!");
 789                 return false;
 790         }
 791 #else
 792         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 793                 experimental = read_ecdsa_private_key();
 794                 if(!experimental)
 795                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 796         } else {
 797                 if(experimental && !read_ecdsa_private_key())
 798                         return false;
 799         }
 800
 801         if(!read_rsa_private_key()) {
 802                 if(experimental) {
 803                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for legacy protocol disabled.");
 804                 } else {
 805                         logger(DEBUG_ALWAYS, LOG_ERR, "No private keys available, cannot start tinc!");
 806                         return false;
 807                 }
 808         }
 809 #endif
 810
 811         /* Ensure myport is numeric */
 812
 813         if(!atoi(myport)) {
 814                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 815                 sockaddr_t sa;
 816                 if(!ai || !ai->ai_addr)
 817                         return false;
 818                 free(myport);
 819                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 820                 sockaddr2str(&sa, NULL, &myport);
 821         }
 822
 823         /* Read in all the subnets specified in the host configuration file */
 824
 825         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 826                 subnet_t *subnet;
 827
 828                 if(!get_config_subnet(cfg, &subnet))
 829                         return false;
 830
 831                 subnet_add(myself, subnet);
 832         }
 833
 834         /* Check some options */
 835
 836         if(!setup_myself_reloadable())
 837                 return false;
 838
 839         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 840         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 841         strictsubnets |= tunnelserver;
 842
 843         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 844                 if(max_connection_burst <= 0) {
 845                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 846                         return false;
 847                 }
 848         }
 849
 850         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 851                 if(udp_rcvbuf <= 0) {
 852                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 853                         return false;
 854                 }
 855         }
 856
 857         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 858                 if(udp_sndbuf <= 0) {
 859                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 860                         return false;
 861                 }
 862         }
 863
 864         int replaywin_int;
 865         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 866                 if(replaywin_int < 0) {
 867                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 868                         return false;
 869                 }
 870                 replaywin = (unsigned)replaywin_int;
 871                 sptps_replaywin = replaywin;
 872         }
 873
 874 #ifndef DISABLE_LEGACY
 875         /* Generate packet encryption key */
 876
 877         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 878                 cipher = xstrdup("blowfish");
 879
 880         if(!strcasecmp(cipher, "none")) {
 881                 myself->incipher = NULL;
 882         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 883                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 884                 return false;
 885         }
 886
 887         free(cipher);
 888
 889         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 890
 891         /* Check if we want to use message authentication codes... */
 892
 893         int maclength = 4;
 894         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 895
 896         if(maclength < 0) {
 897                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 898                 return false;
 899         }
 900
 901         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 902                 digest = xstrdup("sha1");
 903
 904         if(!strcasecmp(digest, "none")) {
 905                 myself->indigest = NULL;
 906         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 907                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 908                 return false;
 909         }
 910
 911         free(digest);
 912 #endif
 913
 914         /* Compression */
 915
 916         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 917                 if(myself->incompression < 0 || myself->incompression > 11) {
 918                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 919                         return false;
 920                 }
 921         } else
 922                 myself->incompression = 0;
 923
 924         myself->connection->outcompression = 0;
 925
 926         /* Done */
 927
 928         myself->nexthop = myself;
 929         myself->via = myself;
 930         myself->status.reachable = true;
 931         myself->last_state_change = now.tv_sec;
 932         myself->status.sptps = experimental;
 933         node_add(myself);
 934
 935         graph();
 936
 937         if(strictsubnets)
 938                 load_all_subnets();
 939         else if(autoconnect)
 940                 load_all_nodes();
 941
 942         /* Open device */
 943
 944         devops = os_devops;
 945
 946         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 947                 if(!strcasecmp(type, "dummy"))
 948                         devops = dummy_devops;
 949                 else if(!strcasecmp(type, "raw_socket"))
 950                         devops = raw_socket_devops;
 951                 else if(!strcasecmp(type, "multicast"))
 952                         devops = multicast_devops;
 953 #ifdef ENABLE_UML
 954                 else if(!strcasecmp(type, "uml"))
 955                         devops = uml_devops;
 956 #endif
 957 #ifdef ENABLE_VDE
 958                 else if(!strcasecmp(type, "vde"))
 959                         devops = vde_devops;
 960 #endif
 961         }
 962
 963         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
 964
 965         if(!devops.setup())
 966                 return false;
 967
 968         if(device_fd >= 0)
 969                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 970
 971         /* Open sockets */
 972
 973         if(!do_detach && getenv("LISTEN_FDS")) {
 974                 sockaddr_t sa;
 975                 socklen_t salen;
 976
 977                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 978 #ifdef HAVE_UNSETENV
 979                 unsetenv("LISTEN_FDS");
 980 #endif
 981
 982                 if(listen_sockets > MAXSOCKETS) {
 983                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 984                         return false;
 985                 }
 986
 987                 for(int i = 0; i < listen_sockets; i++) {
 988                         salen = sizeof sa;
 989                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 990                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
 991                                 return false;
 992                         }
 993
 994 #ifdef FD_CLOEXEC
 995                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 996 #endif
 997
 998                         int udp_fd = setup_vpn_in_socket(&sa);
 999                         if(udp_fd < 0)
1000                                 return false;
1001
1002                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
1003                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
1004
1005                         if(debug_level >= DEBUG_CONNECTIONS) {
1006                                 hostname = sockaddr2hostname(&sa);
1007                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
1008                                 free(hostname);
1009                         }
1010
1011                         memcpy(&listen_socket[i].sa, &sa, salen);
1012                 }
1013         } else {
1014                 listen_sockets = 0;
1015                 int cfgs = 0;
1016
1017                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1018                         cfgs++;
1019                         get_config_string(cfg, &address);
1020                         if(!add_listen_address(address, true))
1021                                 return false;
1022                 }
1023
1024                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1025                         cfgs++;
1026                         get_config_string(cfg, &address);
1027                         if(!add_listen_address(address, false))
1028                                 return false;
1029                 }
1030
1031                 if(!cfgs)
1032                         if(!add_listen_address(address, NULL))
1033                                 return false;
1034         }
1035
1036         if(!listen_sockets) {
1037                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1038                 return false;
1039         }
1040
1041         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1042
1043         if(!port_specified || atoi(myport) == 0) {
1044                 sockaddr_t sa;
1045                 socklen_t salen = sizeof sa;
1046                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1047                         free(myport);
1048                         sockaddr2str(&sa, NULL, &myport);
1049                         if(!myport)
1050                                 myport = xstrdup("655");
1051                 }
1052         }
1053
1054         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1055         myself->connection->hostname = xstrdup(myself->hostname);
1056
1057         /* Done. */
1058
1059         last_config_check = now.tv_sec;
1060
1061         return true;
1062 }
1063
1064 /*
1065   initialize network
1066 */
1067 bool setup_network(void) {
1068         init_connections();
1069         init_subnets();
1070         init_nodes();
1071         init_edges();
1072         init_requests();
1073
1074         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1075                 if(pinginterval < 1) {
1076                         pinginterval = 86400;
1077                 }
1078         } else
1079                 pinginterval = 60;
1080
1081         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
1082                 pingtimeout = 5;
1083         if(pingtimeout < 1 || pingtimeout > pinginterval)
1084                 pingtimeout = pinginterval;
1085
1086         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
1087                 maxoutbufsize = 10 * MTU;
1088
1089         if(!setup_myself())
1090                 return false;
1091
1092         if(!init_control())
1093                 return false;
1094
1095         if (!device_standby)
1096                 device_enable();
1097
1098         /* Run subnet-up scripts for our own subnets */
1099
1100         subnet_update(myself, NULL, true);
1101
1102         return true;
1103 }
1104
1105 /*
1106   close all open network connections
1107 */
1108 void close_network_connections(void) {
1109         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1110                 next = node->next;
1111                 connection_t *c = node->data;
1112                 /* Keep control connections open until the end, so they know when we really terminated */
1113                 if(c->status.control)
1114                         c->socket = -1;
1115                 c->outgoing = NULL;
1116                 terminate_connection(c, false);
1117         }
1118
1119         if(outgoing_list)
1120                 list_delete_list(outgoing_list);
1121
1122         if(myself && myself->connection) {
1123                 subnet_update(myself, NULL, false);
1124                 terminate_connection(myself->connection, false);
1125                 free_connection(myself->connection);
1126         }
1127
1128         for(int i = 0; i < listen_sockets; i++) {
1129                 io_del(&listen_socket[i].tcp);
1130                 io_del(&listen_socket[i].udp);
1131                 close(listen_socket[i].tcp.fd);
1132                 close(listen_socket[i].udp.fd);
1133         }
1134
1135         exit_requests();
1136         exit_edges();
1137         exit_subnets();
1138         exit_nodes();
1139         exit_connections();
1140
1141         if (!device_standby)
1142                 device_disable();
1143
1144         free(myport);
1145
1146         if (device_fd >= 0)
1147                 io_del(&device_io);
1148         if (devops.close)
1149                 devops.close();
1150
1151         exit_control();
1152
1153         free(myname);
1154         free(scriptextension);
1155         free(scriptinterpreter);
1156
1157         return;
1158 }