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