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, "UDPDiscoveryInterval"), &udp_discovery_interval);
 515         get_config_int(lookup_config(config_tree, "UDPDiscoveryTimeout"), &udp_discovery_timeout);
 516
 517         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 518         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 519
 520         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 521                 if(!strcasecmp(rmode, "router"))
 522                         routing_mode = RMODE_ROUTER;
 523                 else if(!strcasecmp(rmode, "switch"))
 524                         routing_mode = RMODE_SWITCH;
 525                 else if(!strcasecmp(rmode, "hub"))
 526                         routing_mode = RMODE_HUB;
 527                 else {
 528                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 529                         return false;
 530                 }
 531                 free(rmode);
 532         }
 533
 534         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 535                 if(!strcasecmp(fmode, "off"))
 536                         forwarding_mode = FMODE_OFF;
 537                 else if(!strcasecmp(fmode, "internal"))
 538                         forwarding_mode = FMODE_INTERNAL;
 539                 else if(!strcasecmp(fmode, "kernel"))
 540                         forwarding_mode = FMODE_KERNEL;
 541                 else {
 542                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 543                         return false;
 544                 }
 545                 free(fmode);
 546         }
 547
 548         choice = true;
 549         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 550         if(choice)
 551                 myself->options |= OPTION_PMTU_DISCOVERY;
 552
 553         choice = true;
 554         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 555         if(choice)
 556                 myself->options |= OPTION_CLAMP_MSS;
 557
 558         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 559         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 560         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 561                 if(!strcasecmp(bmode, "no"))
 562                         broadcast_mode = BMODE_NONE;
 563                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 564                         broadcast_mode = BMODE_MST;
 565                 else if(!strcasecmp(bmode, "direct"))
 566                         broadcast_mode = BMODE_DIRECT;
 567                 else {
 568                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 569                         return false;
 570                 }
 571                 free(bmode);
 572         }
 573
 574         const char* const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
 575         for (size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
 576                 subnet_t *s = new_subnet();
 577                 if (!str2net(s, DEFAULT_BROADCAST_SUBNETS[i]))
 578                         abort();
 579                 subnet_add(NULL, s);
 580         }
 581         for (config_t* cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 582                 subnet_t *s;
 583                 if (!get_config_subnet(cfg, &s))
 584                         continue;
 585                 subnet_add(NULL, s);
 586         }
 587
 588 #if !defined(SOL_IP) || !defined(IP_TOS)
 589         if(priorityinheritance)
 590                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 591 #endif
 592
 593         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 594                 macexpire = 600;
 595
 596         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 597                 if(maxtimeout <= 0) {
 598                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 599                         return false;
 600                 }
 601         } else
 602                 maxtimeout = 900;
 603
 604         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 605                 if(!strcasecmp(afname, "IPv4"))
 606                         addressfamily = AF_INET;
 607                 else if(!strcasecmp(afname, "IPv6"))
 608                         addressfamily = AF_INET6;
 609                 else if(!strcasecmp(afname, "any"))
 610                         addressfamily = AF_UNSPEC;
 611                 else {
 612                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 613                         return false;
 614                 }
 615                 free(afname);
 616         }
 617
 618         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 619
 620         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 621                 keylifetime = 3600;
 622
 623         config_t *cfg = lookup_config(config_tree, "AutoConnect");
 624         if(cfg) {
 625                 if(!get_config_bool(cfg, &autoconnect)) {
 626                         // Some backwards compatibility with when this option was an int
 627                         int val = 0;
 628                         get_config_int(cfg, &val);
 629                         autoconnect = val;
 630                 }
 631         }
 632
 633         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 634
 635         read_invitation_key();
 636
 637         return true;
 638 }
 639
 640 /*
 641   Add listening sockets.
 642 */
 643 static bool add_listen_address(char *address, bool bindto) {
 644         char *port = myport;
 645
 646         if(address) {
 647                 char *space = strchr(address, ' ');
 648                 if(space) {
 649                         *space++ = 0;
 650                         port = space;
 651                 }
 652
 653                 if(!strcmp(address, "*"))
 654                         *address = 0;
 655         }
 656
 657         struct addrinfo *ai, hint = {0};
 658         hint.ai_family = addressfamily;
 659         hint.ai_socktype = SOCK_STREAM;
 660         hint.ai_protocol = IPPROTO_TCP;
 661         hint.ai_flags = AI_PASSIVE;
 662
 663         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 664         free(address);
 665
 666         if(err || !ai) {
 667                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 668                 return false;
 669         }
 670
 671         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 672                 // Ignore duplicate addresses
 673                 bool found = false;
 674
 675                 for(int i = 0; i < listen_sockets; i++)
 676                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 677                                 found = true;
 678                                 break;
 679                         }
 680
 681                 if(found)
 682                         continue;
 683
 684                 if(listen_sockets >= MAXSOCKETS) {
 685                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 686                         return false;
 687                 }
 688
 689                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 690
 691                 if(tcp_fd < 0)
 692                         continue;
 693
 694                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 695
 696                 if(tcp_fd < 0) {
 697                         close(tcp_fd);
 698                         continue;
 699                 }
 700
 701                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 702                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 703
 704                 if(debug_level >= DEBUG_CONNECTIONS) {
 705                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 706                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 707                         free(hostname);
 708                 }
 709
 710                 listen_socket[listen_sockets].bindto = bindto;
 711                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 712                 listen_sockets++;
 713         }
 714
 715         freeaddrinfo(ai);
 716         return true;
 717 }
 718
 719 void device_enable(void) {
 720         if (devops.enable)
 721                 devops.enable();
 722
 723         /* Run tinc-up script to further initialize the tap interface */
 724
 725         char *envp[5] = {NULL};
 726         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 727         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 728         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 729         xasprintf(&envp[3], "NAME=%s", myname);
 730
 731         execute_script("tinc-up", envp);
 732
 733         for(int i = 0; i < 4; i++)
 734                 free(envp[i]);
 735 }
 736
 737 void device_disable(void) {
 738         char *envp[5] = {NULL};
 739         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 740         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 741         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 742         xasprintf(&envp[3], "NAME=%s", myname);
 743
 744         execute_script("tinc-down", envp);
 745
 746         for(int i = 0; i < 4; i++)
 747                 free(envp[i]);
 748
 749         if (devops.disable)
 750                 devops.disable();
 751 }
 752
 753 /*
 754   Configure node_t myself and set up the local sockets (listen only)
 755 */
 756 static bool setup_myself(void) {
 757         char *name, *hostname, *cipher, *digest, *type;
 758         char *address = NULL;
 759         bool port_specified = false;
 760
 761         if(!(name = get_name())) {
 762                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 763                 return false;
 764         }
 765
 766         myname = xstrdup(name);
 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 #ifdef DISABLE_LEGACY
 785         experimental = read_ecdsa_private_key();
 786         if(!experimental) {
 787                 logger(DEBUG_ALWAYS, LOG_ERR, "No private key available, cannot start tinc!");
 788                 return false;
 789         }
 790 #else
 791         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 792                 experimental = read_ecdsa_private_key();
 793                 if(!experimental)
 794                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 795         } else {
 796                 if(experimental && !read_ecdsa_private_key())
 797                         return false;
 798         }
 799
 800         if(!read_rsa_private_key()) {
 801                 if(experimental) {
 802                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for legacy protocol disabled.");
 803                 } else {
 804                         logger(DEBUG_ALWAYS, LOG_ERR, "No private keys available, cannot start tinc!");
 805                         return false;
 806                 }
 807         }
 808 #endif
 809
 810         /* Ensure myport is numeric */
 811
 812         if(!atoi(myport)) {
 813                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 814                 sockaddr_t sa;
 815                 if(!ai || !ai->ai_addr)
 816                         return false;
 817                 free(myport);
 818                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 819                 sockaddr2str(&sa, NULL, &myport);
 820         }
 821
 822         /* Read in all the subnets specified in the host configuration file */
 823
 824         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 825                 subnet_t *subnet;
 826
 827                 if(!get_config_subnet(cfg, &subnet))
 828                         return false;
 829
 830                 subnet_add(myself, subnet);
 831         }
 832
 833         /* Check some options */
 834
 835         if(!setup_myself_reloadable())
 836                 return false;
 837
 838         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 839         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 840         strictsubnets |= tunnelserver;
 841
 842         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 843                 if(max_connection_burst <= 0) {
 844                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 845                         return false;
 846                 }
 847         }
 848
 849         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 850                 if(udp_rcvbuf <= 0) {
 851                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 852                         return false;
 853                 }
 854         }
 855
 856         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 857                 if(udp_sndbuf <= 0) {
 858                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 859                         return false;
 860                 }
 861         }
 862
 863         int replaywin_int;
 864         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 865                 if(replaywin_int < 0) {
 866                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 867                         return false;
 868                 }
 869                 replaywin = (unsigned)replaywin_int;
 870                 sptps_replaywin = replaywin;
 871         }
 872
 873 #ifndef DISABLE_LEGACY
 874         /* Generate packet encryption key */
 875
 876         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 877                 cipher = xstrdup("blowfish");
 878
 879         if(!strcasecmp(cipher, "none")) {
 880                 myself->incipher = NULL;
 881         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 882                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 883                 return false;
 884         }
 885
 886         free(cipher);
 887
 888         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 889
 890         /* Check if we want to use message authentication codes... */
 891
 892         int maclength = 4;
 893         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 894
 895         if(maclength < 0) {
 896                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 897                 return false;
 898         }
 899
 900         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 901                 digest = xstrdup("sha1");
 902
 903         if(!strcasecmp(digest, "none")) {
 904                 myself->indigest = NULL;
 905         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 906                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 907                 return false;
 908         }
 909
 910         free(digest);
 911 #endif
 912
 913         /* Compression */
 914
 915         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 916                 if(myself->incompression < 0 || myself->incompression > 11) {
 917                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 918                         return false;
 919                 }
 920         } else
 921                 myself->incompression = 0;
 922
 923         myself->connection->outcompression = 0;
 924
 925         /* Done */
 926
 927         myself->nexthop = myself;
 928         myself->via = myself;
 929         myself->status.reachable = true;
 930         myself->last_state_change = now.tv_sec;
 931         myself->status.sptps = experimental;
 932         node_add(myself);
 933
 934         graph();
 935
 936         if(strictsubnets)
 937                 load_all_subnets();
 938         else if(autoconnect)
 939                 load_all_nodes();
 940
 941         /* Open device */
 942
 943         devops = os_devops;
 944
 945         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 946                 if(!strcasecmp(type, "dummy"))
 947                         devops = dummy_devops;
 948                 else if(!strcasecmp(type, "raw_socket"))
 949                         devops = raw_socket_devops;
 950                 else if(!strcasecmp(type, "multicast"))
 951                         devops = multicast_devops;
 952 #ifdef ENABLE_UML
 953                 else if(!strcasecmp(type, "uml"))
 954                         devops = uml_devops;
 955 #endif
 956 #ifdef ENABLE_VDE
 957                 else if(!strcasecmp(type, "vde"))
 958                         devops = vde_devops;
 959 #endif
 960         }
 961
 962         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
 963
 964         if(!devops.setup())
 965                 return false;
 966
 967         if(device_fd >= 0)
 968                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 969
 970         /* Open sockets */
 971
 972         if(!do_detach && getenv("LISTEN_FDS")) {
 973                 sockaddr_t sa;
 974                 socklen_t salen;
 975
 976                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 977 #ifdef HAVE_UNSETENV
 978                 unsetenv("LISTEN_FDS");
 979 #endif
 980
 981                 if(listen_sockets > MAXSOCKETS) {
 982                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 983                         return false;
 984                 }
 985
 986                 for(int i = 0; i < listen_sockets; i++) {
 987                         salen = sizeof sa;
 988                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 989                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
 990                                 return false;
 991                         }
 992
 993 #ifdef FD_CLOEXEC
 994                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 995 #endif
 996
 997                         int udp_fd = setup_vpn_in_socket(&sa);
 998                         if(udp_fd < 0)
 999                                 return false;
1000
1001                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
1002                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
1003
1004                         if(debug_level >= DEBUG_CONNECTIONS) {
1005                                 hostname = sockaddr2hostname(&sa);
1006                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
1007                                 free(hostname);
1008                         }
1009
1010                         memcpy(&listen_socket[i].sa, &sa, salen);
1011                 }
1012         } else {
1013                 listen_sockets = 0;
1014                 int cfgs = 0;
1015
1016                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1017                         cfgs++;
1018                         get_config_string(cfg, &address);
1019                         if(!add_listen_address(address, true))
1020                                 return false;
1021                 }
1022
1023                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1024                         cfgs++;
1025                         get_config_string(cfg, &address);
1026                         if(!add_listen_address(address, false))
1027                                 return false;
1028                 }
1029
1030                 if(!cfgs)
1031                         if(!add_listen_address(address, NULL))
1032                                 return false;
1033         }
1034
1035         if(!listen_sockets) {
1036                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1037                 return false;
1038         }
1039
1040         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1041
1042         if(!port_specified || atoi(myport) == 0) {
1043                 sockaddr_t sa;
1044                 socklen_t salen = sizeof sa;
1045                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1046                         free(myport);
1047                         sockaddr2str(&sa, NULL, &myport);
1048                         if(!myport)
1049                                 myport = xstrdup("655");
1050                 }
1051         }
1052
1053         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1054         myself->connection->hostname = xstrdup(myself->hostname);
1055
1056         /* Done. */
1057
1058         last_config_check = now.tv_sec;
1059
1060         return true;
1061 }
1062
1063 /*
1064   initialize network
1065 */
1066 bool setup_network(void) {
1067         init_connections();
1068         init_subnets();
1069         init_nodes();
1070         init_edges();
1071         init_requests();
1072
1073         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1074                 if(pinginterval < 1) {
1075                         pinginterval = 86400;
1076                 }
1077         } else
1078                 pinginterval = 60;
1079
1080         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
1081                 pingtimeout = 5;
1082         if(pingtimeout < 1 || pingtimeout > pinginterval)
1083                 pingtimeout = pinginterval;
1084
1085         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
1086                 maxoutbufsize = 10 * MTU;
1087
1088         if(!setup_myself())
1089                 return false;
1090
1091         if(!init_control())
1092                 return false;
1093
1094         if (!device_standby)
1095                 device_enable();
1096
1097         /* Run subnet-up scripts for our own subnets */
1098
1099         subnet_update(myself, NULL, true);
1100
1101         return true;
1102 }
1103
1104 /*
1105   close all open network connections
1106 */
1107 void close_network_connections(void) {
1108         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1109                 next = node->next;
1110                 connection_t *c = node->data;
1111                 /* Keep control connections open until the end, so they know when we really terminated */
1112                 if(c->status.control)
1113                         c->socket = -1;
1114                 c->outgoing = NULL;
1115                 terminate_connection(c, false);
1116         }
1117
1118         if(outgoing_list)
1119                 list_delete_list(outgoing_list);
1120
1121         if(myself && myself->connection) {
1122                 subnet_update(myself, NULL, false);
1123                 terminate_connection(myself->connection, false);
1124                 free_connection(myself->connection);
1125         }
1126
1127         for(int i = 0; i < listen_sockets; i++) {
1128                 io_del(&listen_socket[i].tcp);
1129                 io_del(&listen_socket[i].udp);
1130                 close(listen_socket[i].tcp.fd);
1131                 close(listen_socket[i].udp.fd);
1132         }
1133
1134         exit_requests();
1135         exit_edges();
1136         exit_subnets();
1137         exit_nodes();
1138         exit_connections();
1139
1140         if (!device_standby)
1141                 device_disable();
1142
1143         free(myport);
1144
1145         if (device_fd >= 0)
1146                 io_del(&device_io);
1147         if (devops.close)
1148                 devops.close();
1149
1150         exit_control();
1151
1152         free(myname);
1153         free(scriptextension);
1154         free(scriptinterpreter);
1155
1156         return;
1157 }