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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2014 Guus Sliepen <guus@tinc-vpn.org>
   5                   2006      Scott Lamb <slamb@slamb.org>
   6                   2010      Brandon Black <blblack@gmail.com>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License along
  19     with this program; if not, write to the Free Software Foundation, Inc.,
  20     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21 */
  22
  23 #include "system.h"
  24
  25 #include "cipher.h"
  26 #include "conf.h"
  27 #include "connection.h"
  28 #include "control.h"
  29 #include "device.h"
  30 #include "digest.h"
  31 #include "ecdsa.h"
  32 #include "graph.h"
  33 #include "logger.h"
  34 #include "names.h"
  35 #include "net.h"
  36 #include "netutl.h"
  37 #include "process.h"
  38 #include "protocol.h"
  39 #include "route.h"
  40 #include "rsa.h"
  41 #include "script.h"
  42 #include "subnet.h"
  43 #include "utils.h"
  44 #include "xalloc.h"
  45
  46 char *myport;
  47 static io_t device_io;
  48 devops_t devops;
  49 bool device_standby = false;
  50
  51 char *proxyhost;
  52 char *proxyport;
  53 char *proxyuser;
  54 char *proxypass;
  55 proxytype_t proxytype;
  56 bool autoconnect;
  57 bool disablebuggypeers;
  58
  59 char *scriptinterpreter;
  60 char *scriptextension;
  61
  62 bool node_read_ecdsa_public_key(node_t *n) {
  63         if(ecdsa_active(n->ecdsa))
  64                 return true;
  65
  66         splay_tree_t *config_tree;
  67         FILE *fp;
  68         char *pubname = NULL;
  69         char *p;
  70
  71         init_configuration(&config_tree);
  72         if(!read_host_config(config_tree, n->name))
  73                 goto exit;
  74
  75         /* First, check for simple Ed25519PublicKey statement */
  76
  77         if(get_config_string(lookup_config(config_tree, "Ed25519PublicKey"), &p)) {
  78                 n->ecdsa = ecdsa_set_base64_public_key(p);
  79                 free(p);
  80                 goto exit;
  81         }
  82
  83         /* Else, check for Ed25519PublicKeyFile statement and read it */
  84
  85         if(!get_config_string(lookup_config(config_tree, "Ed25519PublicKeyFile"), &pubname))
  86                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  87
  88         fp = fopen(pubname, "r");
  89
  90         if(!fp)
  91                 goto exit;
  92
  93         n->ecdsa = ecdsa_read_pem_public_key(fp);
  94         fclose(fp);
  95
  96 exit:
  97         exit_configuration(&config_tree);
  98         free(pubname);
  99         return n->ecdsa;
 100 }
 101
 102 bool read_ecdsa_public_key(connection_t *c) {
 103         if(ecdsa_active(c->ecdsa))
 104                 return true;
 105
 106         FILE *fp;
 107         char *fname;
 108         char *p;
 109
 110         if(!c->config_tree) {
 111                 init_configuration(&c->config_tree);
 112                 if(!read_host_config(c->config_tree, c->name))
 113                         return false;
 114         }
 115
 116         /* First, check for simple Ed25519PublicKey statement */
 117
 118         if(get_config_string(lookup_config(c->config_tree, "Ed25519PublicKey"), &p)) {
 119                 c->ecdsa = ecdsa_set_base64_public_key(p);
 120                 free(p);
 121                 return c->ecdsa;
 122         }
 123
 124         /* Else, check for Ed25519PublicKeyFile statement and read it */
 125
 126         if(!get_config_string(lookup_config(c->config_tree, "Ed25519PublicKeyFile"), &fname))
 127                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 128
 129         fp = fopen(fname, "r");
 130
 131         if(!fp) {
 132                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 public key file `%s': %s",
 133                            fname, strerror(errno));
 134                 free(fname);
 135                 return false;
 136         }
 137
 138         c->ecdsa = ecdsa_read_pem_public_key(fp);
 139         fclose(fp);
 140
 141         if(!c->ecdsa)
 142                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing Ed25519 public key file `%s' failed.", fname);
 143         free(fname);
 144         return c->ecdsa;
 145 }
 146
 147 bool read_rsa_public_key(connection_t *c) {
 148         if(ecdsa_active(c->ecdsa))
 149                 return true;
 150
 151         FILE *fp;
 152         char *fname;
 153         char *n;
 154
 155         /* First, check for simple PublicKey statement */
 156
 157         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 158                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 159                 free(n);
 160                 return c->rsa;
 161         }
 162
 163         /* Else, check for PublicKeyFile statement and read it */
 164
 165         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 166                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 167
 168         fp = fopen(fname, "r");
 169
 170         if(!fp) {
 171                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 172                 free(fname);
 173                 return false;
 174         }
 175
 176         c->rsa = rsa_read_pem_public_key(fp);
 177         fclose(fp);
 178
 179         if(!c->rsa)
 180                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 181         free(fname);
 182         return c->rsa;
 183 }
 184
 185 static bool read_ecdsa_private_key(void) {
 186         FILE *fp;
 187         char *fname;
 188
 189         /* Check for PrivateKeyFile statement and read it */
 190
 191         if(!get_config_string(lookup_config(config_tree, "Ed25519PrivateKeyFile"), &fname))
 192                 xasprintf(&fname, "%s" SLASH "ed25519_key.priv", confbase);
 193
 194         fp = fopen(fname, "r");
 195
 196         if(!fp) {
 197                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 private key file `%s': %s", fname, strerror(errno));
 198                 if(errno == ENOENT)
 199                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an Ed25519 keypair with `tinc -n %s generate-ed25519-keys'.", netname ?: ".");
 200                 free(fname);
 201                 return false;
 202         }
 203
 204 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 205         struct stat s;
 206
 207         if(fstat(fileno(fp), &s)) {
 208                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat Ed25519 private key file `%s': %s'", fname, strerror(errno));
 209                 free(fname);
 210                 return false;
 211         }
 212
 213         if(s.st_mode & ~0100700)
 214                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for Ed25519 private key file `%s'!", fname);
 215 #endif
 216
 217         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 218         fclose(fp);
 219
 220         if(!myself->connection->ecdsa)
 221                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 222         free(fname);
 223         return myself->connection->ecdsa;
 224 }
 225
 226 static bool read_invitation_key(void) {
 227         FILE *fp;
 228         char *fname;
 229
 230         if(invitation_key) {
 231                 ecdsa_free(invitation_key);
 232                 invitation_key = NULL;
 233         }
 234
 235         xasprintf(&fname, "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
 236
 237         fp = fopen(fname, "r");
 238
 239         if(fp) {
 240                 invitation_key = ecdsa_read_pem_private_key(fp);
 241                 fclose(fp);
 242                 if(!invitation_key)
 243                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 244         }
 245
 246         free(fname);
 247         return invitation_key;
 248 }
 249
 250 static bool read_rsa_private_key(void) {
 251         FILE *fp;
 252         char *fname;
 253         char *n, *d;
 254
 255         /* First, check for simple PrivateKey statement */
 256
 257         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 258                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 259                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 260                         free(d);
 261                         return false;
 262                 }
 263                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 264                 free(n);
 265                 free(d);
 266                 return myself->connection->rsa;
 267         }
 268
 269         /* Else, check for PrivateKeyFile statement and read it */
 270
 271         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 272                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 273
 274         fp = fopen(fname, "r");
 275
 276         if(!fp) {
 277                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 278                            fname, strerror(errno));
 279                 free(fname);
 280                 return false;
 281         }
 282
 283 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 284         struct stat s;
 285
 286         if(fstat(fileno(fp), &s)) {
 287                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 288                 free(fname);
 289                 return false;
 290         }
 291
 292         if(s.st_mode & ~0100700)
 293                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 294 #endif
 295
 296         myself->connection->rsa = rsa_read_pem_private_key(fp);
 297         fclose(fp);
 298
 299         if(!myself->connection->rsa)
 300                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 301         free(fname);
 302         return myself->connection->rsa;
 303 }
 304
 305 static timeout_t keyexpire_timeout;
 306
 307 static void keyexpire_handler(void *data) {
 308         regenerate_key();
 309         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 310 }
 311
 312 void regenerate_key(void) {
 313         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 314         send_key_changed();
 315 }
 316
 317 /*
 318   Read Subnets from all host config files
 319 */
 320 void load_all_subnets(void) {
 321         DIR *dir;
 322         struct dirent *ent;
 323         char *dname;
 324
 325         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 326         dir = opendir(dname);
 327         if(!dir) {
 328                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 329                 free(dname);
 330                 return;
 331         }
 332
 333         while((ent = readdir(dir))) {
 334                 if(!check_id(ent->d_name))
 335                         continue;
 336
 337                 node_t *n = lookup_node(ent->d_name);
 338                 #ifdef _DIRENT_HAVE_D_TYPE
 339                 //if(ent->d_type != DT_REG)
 340                 //      continue;
 341                 #endif
 342
 343                 splay_tree_t *config_tree;
 344                 init_configuration(&config_tree);
 345                 read_config_options(config_tree, ent->d_name);
 346                 read_host_config(config_tree, ent->d_name);
 347
 348                 if(!n) {
 349                         n = new_node();
 350                         n->name = xstrdup(ent->d_name);
 351                         node_add(n);
 352                 }
 353
 354                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 355                         subnet_t *s, *s2;
 356
 357                         if(!get_config_subnet(cfg, &s))
 358                                 continue;
 359
 360                         if((s2 = lookup_subnet(n, s))) {
 361                                 s2->expires = -1;
 362                         } else {
 363                                 subnet_add(n, s);
 364                         }
 365                 }
 366
 367                 exit_configuration(&config_tree);
 368         }
 369
 370         closedir(dir);
 371 }
 372
 373 void load_all_nodes(void) {
 374         DIR *dir;
 375         struct dirent *ent;
 376         char *dname;
 377
 378         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 379         dir = opendir(dname);
 380         if(!dir) {
 381                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 382                 free(dname);
 383                 return;
 384         }
 385
 386         while((ent = readdir(dir))) {
 387                 if(!check_id(ent->d_name))
 388                         continue;
 389
 390                 node_t *n = lookup_node(ent->d_name);
 391                 if(n)
 392                         continue;
 393
 394                 n = new_node();
 395                 n->name = xstrdup(ent->d_name);
 396                 node_add(n);
 397         }
 398
 399         closedir(dir);
 400 }
 401
 402
 403 char *get_name(void) {
 404         char *name = NULL;
 405
 406         get_config_string(lookup_config(config_tree, "Name"), &name);
 407
 408         if(!name)
 409                 return NULL;
 410
 411         if(*name == '$') {
 412                 char *envname = getenv(name + 1);
 413                 char hostname[32] = "";
 414                 if(!envname) {
 415                         if(strcmp(name + 1, "HOST")) {
 416                                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1);
 417                                 return false;
 418                         }
 419                         if(gethostname(hostname, sizeof hostname) || !*hostname) {
 420                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", sockstrerror(sockerrno));
 421                                 return false;
 422                         }
 423                         hostname[31] = 0;
 424                         envname = hostname;
 425                 }
 426                 free(name);
 427                 name = xstrdup(envname);
 428                 for(char *c = name; *c; c++)
 429                         if(!isalnum(*c))
 430                                 *c = '_';
 431         }
 432
 433         if(!check_id(name)) {
 434                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
 435                 free(name);
 436                 return false;
 437         }
 438
 439         return name;
 440 }
 441
 442 bool setup_myself_reloadable(void) {
 443         char *proxy = NULL;
 444         char *rmode = NULL;
 445         char *fmode = NULL;
 446         char *bmode = NULL;
 447         char *afname = NULL;
 448         char *address = NULL;
 449         char *space;
 450         bool choice;
 451
 452         free(scriptinterpreter);
 453         scriptinterpreter = NULL;
 454         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 455
 456
 457         free(scriptextension);
 458         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 459                 scriptextension = xstrdup("");
 460
 461         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 462         if(proxy) {
 463                 if((space = strchr(proxy, ' ')))
 464                         *space++ = 0;
 465
 466                 if(!strcasecmp(proxy, "none")) {
 467                         proxytype = PROXY_NONE;
 468                 } else if(!strcasecmp(proxy, "socks4")) {
 469                         proxytype = PROXY_SOCKS4;
 470                 } else if(!strcasecmp(proxy, "socks4a")) {
 471                         proxytype = PROXY_SOCKS4A;
 472                 } else if(!strcasecmp(proxy, "socks5")) {
 473                         proxytype = PROXY_SOCKS5;
 474                 } else if(!strcasecmp(proxy, "http")) {
 475                         proxytype = PROXY_HTTP;
 476                 } else if(!strcasecmp(proxy, "exec")) {
 477                         proxytype = PROXY_EXEC;
 478                 } else {
 479                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 480                         return false;
 481                 }
 482
 483                 switch(proxytype) {
 484                         case PROXY_NONE:
 485                         default:
 486                                 break;
 487
 488                         case PROXY_EXEC:
 489                                 if(!space || !*space) {
 490                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 491                                         return false;
 492                                 }
 493                                 proxyhost =  xstrdup(space);
 494                                 break;
 495
 496                         case PROXY_SOCKS4:
 497                         case PROXY_SOCKS4A:
 498                         case PROXY_SOCKS5:
 499                         case PROXY_HTTP:
 500                                 proxyhost = space;
 501                                 if(space && (space = strchr(space, ' ')))
 502                                         *space++ = 0, proxyport = space;
 503                                 if(space && (space = strchr(space, ' ')))
 504                                         *space++ = 0, proxyuser = space;
 505                                 if(space && (space = strchr(space, ' ')))
 506                                         *space++ = 0, proxypass = space;
 507                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 508                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 509                                         return false;
 510                                 }
 511                                 proxyhost = xstrdup(proxyhost);
 512                                 proxyport = xstrdup(proxyport);
 513                                 if(proxyuser && *proxyuser)
 514                                         proxyuser = xstrdup(proxyuser);
 515                                 if(proxypass && *proxypass)
 516                                         proxypass = xstrdup(proxypass);
 517                                 break;
 518                 }
 519
 520                 free(proxy);
 521         }
 522
 523         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 524                 myself->options |= OPTION_INDIRECT;
 525
 526         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 527                 myself->options |= OPTION_TCPONLY;
 528
 529         if(myself->options & OPTION_TCPONLY)
 530                 myself->options |= OPTION_INDIRECT;
 531
 532         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 533         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 534
 535         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 536                 if(!strcasecmp(rmode, "router"))
 537                         routing_mode = RMODE_ROUTER;
 538                 else if(!strcasecmp(rmode, "switch"))
 539                         routing_mode = RMODE_SWITCH;
 540                 else if(!strcasecmp(rmode, "hub"))
 541                         routing_mode = RMODE_HUB;
 542                 else {
 543                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 544                         return false;
 545                 }
 546                 free(rmode);
 547         }
 548
 549         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 550                 if(!strcasecmp(fmode, "off"))
 551                         forwarding_mode = FMODE_OFF;
 552                 else if(!strcasecmp(fmode, "internal"))
 553                         forwarding_mode = FMODE_INTERNAL;
 554                 else if(!strcasecmp(fmode, "kernel"))
 555                         forwarding_mode = FMODE_KERNEL;
 556                 else {
 557                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 558                         return false;
 559                 }
 560                 free(fmode);
 561         }
 562
 563         choice = true;
 564         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 565         if(choice)
 566                 myself->options |= OPTION_PMTU_DISCOVERY;
 567
 568         choice = true;
 569         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 570         if(choice)
 571                 myself->options |= OPTION_CLAMP_MSS;
 572
 573         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 574         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 575         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 576                 if(!strcasecmp(bmode, "no"))
 577                         broadcast_mode = BMODE_NONE;
 578                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 579                         broadcast_mode = BMODE_MST;
 580                 else if(!strcasecmp(bmode, "direct"))
 581                         broadcast_mode = BMODE_DIRECT;
 582                 else {
 583                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 584                         return false;
 585                 }
 586                 free(bmode);
 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", myself->name);
 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", myself->name);
 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         myself = new_node();
 768         myself->connection = new_connection();
 769         myself->name = name;
 770         myself->connection->name = xstrdup(name);
 771         read_host_config(config_tree, name);
 772
 773         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 774                 myport = xstrdup("655");
 775         else
 776                 port_specified = true;
 777
 778         myself->connection->options = 0;
 779         myself->connection->protocol_major = PROT_MAJOR;
 780         myself->connection->protocol_minor = PROT_MINOR;
 781
 782         myself->options |= PROT_MINOR << 24;
 783
 784         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 785                 experimental = read_ecdsa_private_key();
 786                 if(!experimental)
 787                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 788         } else {
 789                 if(experimental && !read_ecdsa_private_key())
 790                         return false;
 791         }
 792
 793         if(!read_rsa_private_key())
 794                 return false;
 795
 796         /* Ensure myport is numeric */
 797
 798         if(!atoi(myport)) {
 799                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 800                 sockaddr_t sa;
 801                 if(!ai || !ai->ai_addr)
 802                         return false;
 803                 free(myport);
 804                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 805                 sockaddr2str(&sa, NULL, &myport);
 806         }
 807
 808         /* Read in all the subnets specified in the host configuration file */
 809
 810         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 811                 subnet_t *subnet;
 812
 813                 if(!get_config_subnet(cfg, &subnet))
 814                         return false;
 815
 816                 subnet_add(myself, subnet);
 817         }
 818
 819         /* Check some options */
 820
 821         if(!setup_myself_reloadable())
 822                 return false;
 823
 824         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 825         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 826         strictsubnets |= tunnelserver;
 827
 828         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 829                 if(max_connection_burst <= 0) {
 830                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 831                         return false;
 832                 }
 833         }
 834
 835         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 836                 if(udp_rcvbuf <= 0) {
 837                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 838                         return false;
 839                 }
 840         }
 841
 842         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 843                 if(udp_sndbuf <= 0) {
 844                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 845                         return false;
 846                 }
 847         }
 848
 849         int replaywin_int;
 850         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 851                 if(replaywin_int < 0) {
 852                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 853                         return false;
 854                 }
 855                 replaywin = (unsigned)replaywin_int;
 856                 sptps_replaywin = replaywin;
 857         }
 858
 859         /* Generate packet encryption key */
 860
 861         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 862                 cipher = xstrdup("blowfish");
 863
 864         if(!strcasecmp(cipher, "none")) {
 865                 myself->incipher = NULL;
 866         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 867                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 868                 return false;
 869         }
 870
 871         free(cipher);
 872
 873         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 874
 875         /* Check if we want to use message authentication codes... */
 876
 877         int maclength = 4;
 878         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 879
 880         if(maclength < 0) {
 881                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 882                 return false;
 883         }
 884
 885         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 886                 digest = xstrdup("sha1");
 887
 888         if(!strcasecmp(digest, "none")) {
 889                 myself->indigest = NULL;
 890         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 891                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 892                 return false;
 893         }
 894
 895         free(digest);
 896
 897         /* Compression */
 898
 899         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 900                 if(myself->incompression < 0 || myself->incompression > 11) {
 901                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 902                         return false;
 903                 }
 904         } else
 905                 myself->incompression = 0;
 906
 907         myself->connection->outcompression = 0;
 908
 909         /* Done */
 910
 911         myself->nexthop = myself;
 912         myself->via = myself;
 913         myself->status.reachable = true;
 914         myself->last_state_change = now.tv_sec;
 915         myself->status.sptps = experimental;
 916         node_add(myself);
 917
 918         graph();
 919
 920         if(strictsubnets)
 921                 load_all_subnets();
 922         else if(autoconnect)
 923                 load_all_nodes();
 924
 925         /* Open device */
 926
 927         devops = os_devops;
 928
 929         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 930                 if(!strcasecmp(type, "dummy"))
 931                         devops = dummy_devops;
 932                 else if(!strcasecmp(type, "raw_socket"))
 933                         devops = raw_socket_devops;
 934                 else if(!strcasecmp(type, "multicast"))
 935                         devops = multicast_devops;
 936 #ifdef ENABLE_UML
 937                 else if(!strcasecmp(type, "uml"))
 938                         devops = uml_devops;
 939 #endif
 940 #ifdef ENABLE_VDE
 941                 else if(!strcasecmp(type, "vde"))
 942                         devops = vde_devops;
 943 #endif
 944         }
 945
 946         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
 947
 948         if(!devops.setup())
 949                 return false;
 950
 951         if(device_fd >= 0)
 952                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 953
 954         /* Open sockets */
 955
 956         if(!do_detach && getenv("LISTEN_FDS")) {
 957                 sockaddr_t sa;
 958                 socklen_t salen;
 959
 960                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 961 #ifdef HAVE_UNSETENV
 962                 unsetenv("LISTEN_FDS");
 963 #endif
 964
 965                 if(listen_sockets > MAXSOCKETS) {
 966                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 967                         return false;
 968                 }
 969
 970                 for(int i = 0; i < listen_sockets; i++) {
 971                         salen = sizeof sa;
 972                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 973                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
 974                                 return false;
 975                         }
 976
 977 #ifdef FD_CLOEXEC
 978                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 979 #endif
 980
 981                         int udp_fd = setup_vpn_in_socket(&sa);
 982                         if(udp_fd < 0)
 983                                 return false;
 984
 985                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
 986                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
 987
 988                         if(debug_level >= DEBUG_CONNECTIONS) {
 989                                 hostname = sockaddr2hostname(&sa);
 990                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 991                                 free(hostname);
 992                         }
 993
 994                         memcpy(&listen_socket[i].sa, &sa, salen);
 995                 }
 996         } else {
 997                 listen_sockets = 0;
 998                 int cfgs = 0;
 999
1000                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1001                         cfgs++;
1002                         get_config_string(cfg, &address);
1003                         if(!add_listen_address(address, true))
1004                                 return false;
1005                 }
1006
1007                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1008                         cfgs++;
1009                         get_config_string(cfg, &address);
1010                         if(!add_listen_address(address, false))
1011                                 return false;
1012                 }
1013
1014                 if(!cfgs)
1015                         if(!add_listen_address(address, NULL))
1016                                 return false;
1017         }
1018
1019         if(!listen_sockets) {
1020                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1021                 return false;
1022         }
1023
1024         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1025
1026         if(!port_specified) {
1027                 sockaddr_t sa;
1028                 socklen_t salen = sizeof sa;
1029                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1030                         free(myport);
1031                         sockaddr2str(&sa, NULL, &myport);
1032                         if(!myport)
1033                                 myport = xstrdup("655");
1034                 }
1035         }
1036
1037         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1038         myself->connection->hostname = xstrdup(myself->hostname);
1039
1040         /* Done. */
1041
1042         last_config_check = now.tv_sec;
1043
1044         return true;
1045 }
1046
1047 /*
1048   initialize network
1049 */
1050 bool setup_network(void) {
1051         init_connections();
1052         init_subnets();
1053         init_nodes();
1054         init_edges();
1055         init_requests();
1056
1057         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1058                 if(pinginterval < 1) {
1059                         pinginterval = 86400;
1060                 }
1061         } else
1062                 pinginterval = 60;
1063
1064         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
1065                 pingtimeout = 5;
1066         if(pingtimeout < 1 || pingtimeout > pinginterval)
1067                 pingtimeout = pinginterval;
1068
1069         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
1070                 maxoutbufsize = 10 * MTU;
1071
1072         if(!setup_myself())
1073                 return false;
1074
1075         if(!init_control())
1076                 return false;
1077
1078         if (!device_standby)
1079                 device_enable();
1080
1081         /* Run subnet-up scripts for our own subnets */
1082
1083         subnet_update(myself, NULL, true);
1084
1085         return true;
1086 }
1087
1088 /*
1089   close all open network connections
1090 */
1091 void close_network_connections(void) {
1092         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1093                 next = node->next;
1094                 connection_t *c = node->data;
1095                 /* Keep control connections open until the end, so they know when we really terminated */
1096                 if(c->status.control)
1097                         c->socket = -1;
1098                 c->outgoing = NULL;
1099                 terminate_connection(c, false);
1100         }
1101
1102         if(outgoing_list)
1103                 list_delete_list(outgoing_list);
1104
1105         if(myself && myself->connection) {
1106                 subnet_update(myself, NULL, false);
1107                 terminate_connection(myself->connection, false);
1108                 free_connection(myself->connection);
1109         }
1110
1111         for(int i = 0; i < listen_sockets; i++) {
1112                 io_del(&listen_socket[i].tcp);
1113                 io_del(&listen_socket[i].udp);
1114                 close(listen_socket[i].tcp.fd);
1115                 close(listen_socket[i].udp.fd);
1116         }
1117
1118         exit_requests();
1119         exit_edges();
1120         exit_subnets();
1121         exit_nodes();
1122         exit_connections();
1123
1124         if (!device_standby)
1125                 device_disable();
1126
1127         if(myport) free(myport);
1128
1129         if (device_fd >= 0)
1130                 io_del(&device_io);
1131         devops.close();
1132
1133         exit_control();
1134
1135         return;
1136 }