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 *space;
 449         bool choice;
 450
 451         free(scriptinterpreter);
 452         scriptinterpreter = NULL;
 453         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 454
 455
 456         free(scriptextension);
 457         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 458                 scriptextension = xstrdup("");
 459
 460         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 461         if(proxy) {
 462                 if((space = strchr(proxy, ' ')))
 463                         *space++ = 0;
 464
 465                 if(!strcasecmp(proxy, "none")) {
 466                         proxytype = PROXY_NONE;
 467                 } else if(!strcasecmp(proxy, "socks4")) {
 468                         proxytype = PROXY_SOCKS4;
 469                 } else if(!strcasecmp(proxy, "socks4a")) {
 470                         proxytype = PROXY_SOCKS4A;
 471                 } else if(!strcasecmp(proxy, "socks5")) {
 472                         proxytype = PROXY_SOCKS5;
 473                 } else if(!strcasecmp(proxy, "http")) {
 474                         proxytype = PROXY_HTTP;
 475                 } else if(!strcasecmp(proxy, "exec")) {
 476                         proxytype = PROXY_EXEC;
 477                 } else {
 478                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 479                         return false;
 480                 }
 481
 482                 switch(proxytype) {
 483                         case PROXY_NONE:
 484                         default:
 485                                 break;
 486
 487                         case PROXY_EXEC:
 488                                 if(!space || !*space) {
 489                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 490                                         return false;
 491                                 }
 492                                 proxyhost =  xstrdup(space);
 493                                 break;
 494
 495                         case PROXY_SOCKS4:
 496                         case PROXY_SOCKS4A:
 497                         case PROXY_SOCKS5:
 498                         case PROXY_HTTP:
 499                                 proxyhost = space;
 500                                 if(space && (space = strchr(space, ' ')))
 501                                         *space++ = 0, proxyport = space;
 502                                 if(space && (space = strchr(space, ' ')))
 503                                         *space++ = 0, proxyuser = space;
 504                                 if(space && (space = strchr(space, ' ')))
 505                                         *space++ = 0, proxypass = space;
 506                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 507                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 508                                         return false;
 509                                 }
 510                                 proxyhost = xstrdup(proxyhost);
 511                                 proxyport = xstrdup(proxyport);
 512                                 if(proxyuser && *proxyuser)
 513                                         proxyuser = xstrdup(proxyuser);
 514                                 if(proxypass && *proxypass)
 515                                         proxypass = xstrdup(proxypass);
 516                                 break;
 517                 }
 518
 519                 free(proxy);
 520         }
 521
 522         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 523                 myself->options |= OPTION_INDIRECT;
 524
 525         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 526                 myself->options |= OPTION_TCPONLY;
 527
 528         if(myself->options & OPTION_TCPONLY)
 529                 myself->options |= OPTION_INDIRECT;
 530
 531         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 532         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 533
 534         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 535                 if(!strcasecmp(rmode, "router"))
 536                         routing_mode = RMODE_ROUTER;
 537                 else if(!strcasecmp(rmode, "switch"))
 538                         routing_mode = RMODE_SWITCH;
 539                 else if(!strcasecmp(rmode, "hub"))
 540                         routing_mode = RMODE_HUB;
 541                 else {
 542                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 543                         return false;
 544                 }
 545                 free(rmode);
 546         }
 547
 548         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 549                 if(!strcasecmp(fmode, "off"))
 550                         forwarding_mode = FMODE_OFF;
 551                 else if(!strcasecmp(fmode, "internal"))
 552                         forwarding_mode = FMODE_INTERNAL;
 553                 else if(!strcasecmp(fmode, "kernel"))
 554                         forwarding_mode = FMODE_KERNEL;
 555                 else {
 556                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 557                         return false;
 558                 }
 559                 free(fmode);
 560         }
 561
 562         choice = true;
 563         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 564         if(choice)
 565                 myself->options |= OPTION_PMTU_DISCOVERY;
 566
 567         choice = true;
 568         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 569         if(choice)
 570                 myself->options |= OPTION_CLAMP_MSS;
 571
 572         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 573         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 574         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 575                 if(!strcasecmp(bmode, "no"))
 576                         broadcast_mode = BMODE_NONE;
 577                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 578                         broadcast_mode = BMODE_MST;
 579                 else if(!strcasecmp(bmode, "direct"))
 580                         broadcast_mode = BMODE_DIRECT;
 581                 else {
 582                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 583                         return false;
 584                 }
 585                 free(bmode);
 586         }
 587
 588         const char* const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
 589         for (size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
 590                 subnet_t *s = new_subnet();
 591                 if (!str2net(s, DEFAULT_BROADCAST_SUBNETS[i]))
 592                         abort();
 593                 subnet_add(NULL, s);
 594         }
 595         for (config_t* cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 596                 subnet_t *s;
 597                 if (!get_config_subnet(cfg, &s))
 598                         continue;
 599                 subnet_add(NULL, s);
 600         }
 601
 602 #if !defined(SOL_IP) || !defined(IP_TOS)
 603         if(priorityinheritance)
 604                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 605 #endif
 606
 607         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 608                 macexpire = 600;
 609
 610         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 611                 if(maxtimeout <= 0) {
 612                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 613                         return false;
 614                 }
 615         } else
 616                 maxtimeout = 900;
 617
 618         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 619                 if(!strcasecmp(afname, "IPv4"))
 620                         addressfamily = AF_INET;
 621                 else if(!strcasecmp(afname, "IPv6"))
 622                         addressfamily = AF_INET6;
 623                 else if(!strcasecmp(afname, "any"))
 624                         addressfamily = AF_UNSPEC;
 625                 else {
 626                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 627                         return false;
 628                 }
 629                 free(afname);
 630         }
 631
 632         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 633
 634         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 635                 keylifetime = 3600;
 636
 637         config_t *cfg = lookup_config(config_tree, "AutoConnect");
 638         if(cfg) {
 639                 if(!get_config_bool(cfg, &autoconnect)) {
 640                         // Some backwards compatibility with when this option was an int
 641                         int val = 0;
 642                         get_config_int(cfg, &val);
 643                         autoconnect = val;
 644                 }
 645         }
 646
 647         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 648
 649         read_invitation_key();
 650
 651         return true;
 652 }
 653
 654 /*
 655   Add listening sockets.
 656 */
 657 static bool add_listen_address(char *address, bool bindto) {
 658         char *port = myport;
 659
 660         if(address) {
 661                 char *space = strchr(address, ' ');
 662                 if(space) {
 663                         *space++ = 0;
 664                         port = space;
 665                 }
 666
 667                 if(!strcmp(address, "*"))
 668                         *address = 0;
 669         }
 670
 671         struct addrinfo *ai, hint = {0};
 672         hint.ai_family = addressfamily;
 673         hint.ai_socktype = SOCK_STREAM;
 674         hint.ai_protocol = IPPROTO_TCP;
 675         hint.ai_flags = AI_PASSIVE;
 676
 677         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 678         free(address);
 679
 680         if(err || !ai) {
 681                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 682                 return false;
 683         }
 684
 685         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 686                 // Ignore duplicate addresses
 687                 bool found = false;
 688
 689                 for(int i = 0; i < listen_sockets; i++)
 690                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 691                                 found = true;
 692                                 break;
 693                         }
 694
 695                 if(found)
 696                         continue;
 697
 698                 if(listen_sockets >= MAXSOCKETS) {
 699                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 700                         return false;
 701                 }
 702
 703                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 704
 705                 if(tcp_fd < 0)
 706                         continue;
 707
 708                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 709
 710                 if(tcp_fd < 0) {
 711                         close(tcp_fd);
 712                         continue;
 713                 }
 714
 715                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 716                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 717
 718                 if(debug_level >= DEBUG_CONNECTIONS) {
 719                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 720                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 721                         free(hostname);
 722                 }
 723
 724                 listen_socket[listen_sockets].bindto = bindto;
 725                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 726                 listen_sockets++;
 727         }
 728
 729         freeaddrinfo(ai);
 730         return true;
 731 }
 732
 733 void device_enable(void) {
 734         if (devops.enable)
 735                 devops.enable();
 736
 737         /* Run tinc-up script to further initialize the tap interface */
 738
 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-up", envp);
 746
 747         for(int i = 0; i < 4; i++)
 748                 free(envp[i]);
 749 }
 750
 751 void device_disable(void) {
 752         char *envp[5] = {NULL};
 753         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 754         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 755         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 756         xasprintf(&envp[3], "NAME=%s", myself->name);
 757
 758         execute_script("tinc-down", envp);
 759
 760         for(int i = 0; i < 4; i++)
 761                 free(envp[i]);
 762
 763         if (devops.disable)
 764                 devops.disable();
 765 }
 766
 767 /*
 768   Configure node_t myself and set up the local sockets (listen only)
 769 */
 770 static bool setup_myself(void) {
 771         char *name, *hostname, *cipher, *digest, *type;
 772         char *address = NULL;
 773         bool port_specified = false;
 774
 775         if(!(name = get_name())) {
 776                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 777                 return false;
 778         }
 779
 780         myself = new_node();
 781         myself->connection = new_connection();
 782         myself->name = name;
 783         myself->connection->name = xstrdup(name);
 784         read_host_config(config_tree, name);
 785
 786         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 787                 myport = xstrdup("655");
 788         else
 789                 port_specified = true;
 790
 791         myself->connection->options = 0;
 792         myself->connection->protocol_major = PROT_MAJOR;
 793         myself->connection->protocol_minor = PROT_MINOR;
 794
 795         myself->options |= PROT_MINOR << 24;
 796
 797         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 798                 experimental = read_ecdsa_private_key();
 799                 if(!experimental)
 800                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 801         } else {
 802                 if(experimental && !read_ecdsa_private_key())
 803                         return false;
 804         }
 805
 806         if(!read_rsa_private_key())
 807                 return false;
 808
 809         /* Ensure myport is numeric */
 810
 811         if(!atoi(myport)) {
 812                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 813                 sockaddr_t sa;
 814                 if(!ai || !ai->ai_addr)
 815                         return false;
 816                 free(myport);
 817                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 818                 sockaddr2str(&sa, NULL, &myport);
 819         }
 820
 821         /* Read in all the subnets specified in the host configuration file */
 822
 823         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 824                 subnet_t *subnet;
 825
 826                 if(!get_config_subnet(cfg, &subnet))
 827                         return false;
 828
 829                 subnet_add(myself, subnet);
 830         }
 831
 832         /* Check some options */
 833
 834         if(!setup_myself_reloadable())
 835                 return false;
 836
 837         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 838         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 839         strictsubnets |= tunnelserver;
 840
 841         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 842                 if(max_connection_burst <= 0) {
 843                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 844                         return false;
 845                 }
 846         }
 847
 848         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 849                 if(udp_rcvbuf <= 0) {
 850                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 851                         return false;
 852                 }
 853         }
 854
 855         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 856                 if(udp_sndbuf <= 0) {
 857                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 858                         return false;
 859                 }
 860         }
 861
 862         int replaywin_int;
 863         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 864                 if(replaywin_int < 0) {
 865                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 866                         return false;
 867                 }
 868                 replaywin = (unsigned)replaywin_int;
 869                 sptps_replaywin = replaywin;
 870         }
 871
 872         /* Generate packet encryption key */
 873
 874         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 875                 cipher = xstrdup("blowfish");
 876
 877         if(!strcasecmp(cipher, "none")) {
 878                 myself->incipher = NULL;
 879         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 880                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 881                 return false;
 882         }
 883
 884         free(cipher);
 885
 886         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 887
 888         /* Check if we want to use message authentication codes... */
 889
 890         int maclength = 4;
 891         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 892
 893         if(maclength < 0) {
 894                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 895                 return false;
 896         }
 897
 898         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 899                 digest = xstrdup("sha1");
 900
 901         if(!strcasecmp(digest, "none")) {
 902                 myself->indigest = NULL;
 903         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 904                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 905                 return false;
 906         }
 907
 908         free(digest);
 909
 910         /* Compression */
 911
 912         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 913                 if(myself->incompression < 0 || myself->incompression > 11) {
 914                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 915                         return false;
 916                 }
 917         } else
 918                 myself->incompression = 0;
 919
 920         myself->connection->outcompression = 0;
 921
 922         /* Done */
 923
 924         myself->nexthop = myself;
 925         myself->via = myself;
 926         myself->status.reachable = true;
 927         myself->last_state_change = now.tv_sec;
 928         myself->status.sptps = experimental;
 929         node_add(myself);
 930
 931         graph();
 932
 933         if(strictsubnets)
 934                 load_all_subnets();
 935         else if(autoconnect)
 936                 load_all_nodes();
 937
 938         /* Open device */
 939
 940         devops = os_devops;
 941
 942         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 943                 if(!strcasecmp(type, "dummy"))
 944                         devops = dummy_devops;
 945                 else if(!strcasecmp(type, "raw_socket"))
 946                         devops = raw_socket_devops;
 947                 else if(!strcasecmp(type, "multicast"))
 948                         devops = multicast_devops;
 949 #ifdef ENABLE_UML
 950                 else if(!strcasecmp(type, "uml"))
 951                         devops = uml_devops;
 952 #endif
 953 #ifdef ENABLE_VDE
 954                 else if(!strcasecmp(type, "vde"))
 955                         devops = vde_devops;
 956 #endif
 957         }
 958
 959         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
 960
 961         if(!devops.setup())
 962                 return false;
 963
 964         if(device_fd >= 0)
 965                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 966
 967         /* Open sockets */
 968
 969         if(!do_detach && getenv("LISTEN_FDS")) {
 970                 sockaddr_t sa;
 971                 socklen_t salen;
 972
 973                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 974 #ifdef HAVE_UNSETENV
 975                 unsetenv("LISTEN_FDS");
 976 #endif
 977
 978                 if(listen_sockets > MAXSOCKETS) {
 979                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 980                         return false;
 981                 }
 982
 983                 for(int i = 0; i < listen_sockets; i++) {
 984                         salen = sizeof sa;
 985                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 986                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
 987                                 return false;
 988                         }
 989
 990 #ifdef FD_CLOEXEC
 991                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 992 #endif
 993
 994                         int udp_fd = setup_vpn_in_socket(&sa);
 995                         if(udp_fd < 0)
 996                                 return false;
 997
 998                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
 999                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
1000
1001                         if(debug_level >= DEBUG_CONNECTIONS) {
1002                                 hostname = sockaddr2hostname(&sa);
1003                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
1004                                 free(hostname);
1005                         }
1006
1007                         memcpy(&listen_socket[i].sa, &sa, salen);
1008                 }
1009         } else {
1010                 listen_sockets = 0;
1011                 int cfgs = 0;
1012
1013                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1014                         cfgs++;
1015                         get_config_string(cfg, &address);
1016                         if(!add_listen_address(address, true))
1017                                 return false;
1018                 }
1019
1020                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1021                         cfgs++;
1022                         get_config_string(cfg, &address);
1023                         if(!add_listen_address(address, false))
1024                                 return false;
1025                 }
1026
1027                 if(!cfgs)
1028                         if(!add_listen_address(address, NULL))
1029                                 return false;
1030         }
1031
1032         if(!listen_sockets) {
1033                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1034                 return false;
1035         }
1036
1037         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1038
1039         if(!port_specified || atoi(myport) == 0) {
1040                 sockaddr_t sa;
1041                 socklen_t salen = sizeof sa;
1042                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1043                         free(myport);
1044                         sockaddr2str(&sa, NULL, &myport);
1045                         if(!myport)
1046                                 myport = xstrdup("655");
1047                 }
1048         }
1049
1050         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1051         myself->connection->hostname = xstrdup(myself->hostname);
1052
1053         /* Done. */
1054
1055         last_config_check = now.tv_sec;
1056
1057         return true;
1058 }
1059
1060 /*
1061   initialize network
1062 */
1063 bool setup_network(void) {
1064         init_connections();
1065         init_subnets();
1066         init_nodes();
1067         init_edges();
1068         init_requests();
1069
1070         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1071                 if(pinginterval < 1) {
1072                         pinginterval = 86400;
1073                 }
1074         } else
1075                 pinginterval = 60;
1076
1077         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
1078                 pingtimeout = 5;
1079         if(pingtimeout < 1 || pingtimeout > pinginterval)
1080                 pingtimeout = pinginterval;
1081
1082         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
1083                 maxoutbufsize = 10 * MTU;
1084
1085         if(!setup_myself())
1086                 return false;
1087
1088         if(!init_control())
1089                 return false;
1090
1091         if (!device_standby)
1092                 device_enable();
1093
1094         /* Run subnet-up scripts for our own subnets */
1095
1096         subnet_update(myself, NULL, true);
1097
1098         return true;
1099 }
1100
1101 /*
1102   close all open network connections
1103 */
1104 void close_network_connections(void) {
1105         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1106                 next = node->next;
1107                 connection_t *c = node->data;
1108                 /* Keep control connections open until the end, so they know when we really terminated */
1109                 if(c->status.control)
1110                         c->socket = -1;
1111                 c->outgoing = NULL;
1112                 terminate_connection(c, false);
1113         }
1114
1115         if(outgoing_list)
1116                 list_delete_list(outgoing_list);
1117
1118         if(myself && myself->connection) {
1119                 subnet_update(myself, NULL, false);
1120                 terminate_connection(myself->connection, false);
1121                 free_connection(myself->connection);
1122         }
1123
1124         for(int i = 0; i < listen_sockets; i++) {
1125                 io_del(&listen_socket[i].tcp);
1126                 io_del(&listen_socket[i].udp);
1127                 close(listen_socket[i].tcp.fd);
1128                 close(listen_socket[i].udp.fd);
1129         }
1130
1131         exit_requests();
1132         exit_edges();
1133         exit_subnets();
1134         exit_nodes();
1135         exit_connections();
1136
1137         if (!device_standby)
1138                 device_disable();
1139
1140         if(myport) free(myport);
1141
1142         if (device_fd >= 0)
1143                 io_del(&device_io);
1144         devops.close();
1145
1146         exit_control();
1147
1148         return;
1149 }