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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2016 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 #ifdef HAVE_MINIUPNPC
  47 #include "upnp.h"
  48 #endif
  49
  50 char *myport;
  51 static char *myname;
  52 static io_t device_io;
  53 devops_t devops;
  54 bool device_standby = false;
  55
  56 char *proxyhost;
  57 char *proxyport;
  58 char *proxyuser;
  59 char *proxypass;
  60 proxytype_t proxytype;
  61 bool autoconnect;
  62 bool disablebuggypeers;
  63
  64 char *scriptinterpreter;
  65 char *scriptextension;
  66
  67 bool node_read_ecdsa_public_key(node_t *n) {
  68         if(ecdsa_active(n->ecdsa))
  69                 return true;
  70
  71         splay_tree_t *config_tree;
  72         FILE *fp;
  73         char *pubname = NULL;
  74         char *p;
  75
  76         init_configuration(&config_tree);
  77         if(!read_host_config(config_tree, n->name))
  78                 goto exit;
  79
  80         /* First, check for simple Ed25519PublicKey statement */
  81
  82         if(get_config_string(lookup_config(config_tree, "Ed25519PublicKey"), &p)) {
  83                 n->ecdsa = ecdsa_set_base64_public_key(p);
  84                 free(p);
  85                 goto exit;
  86         }
  87
  88         /* Else, check for Ed25519PublicKeyFile statement and read it */
  89
  90         if(!get_config_string(lookup_config(config_tree, "Ed25519PublicKeyFile"), &pubname))
  91                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  92
  93         fp = fopen(pubname, "r");
  94
  95         if(!fp)
  96                 goto exit;
  97
  98         n->ecdsa = ecdsa_read_pem_public_key(fp);
  99         fclose(fp);
 100
 101 exit:
 102         exit_configuration(&config_tree);
 103         free(pubname);
 104         return n->ecdsa;
 105 }
 106
 107 bool read_ecdsa_public_key(connection_t *c) {
 108         if(ecdsa_active(c->ecdsa))
 109                 return true;
 110
 111         FILE *fp;
 112         char *fname;
 113         char *p;
 114
 115         if(!c->config_tree) {
 116                 init_configuration(&c->config_tree);
 117                 if(!read_host_config(c->config_tree, c->name))
 118                         return false;
 119         }
 120
 121         /* First, check for simple Ed25519PublicKey statement */
 122
 123         if(get_config_string(lookup_config(c->config_tree, "Ed25519PublicKey"), &p)) {
 124                 c->ecdsa = ecdsa_set_base64_public_key(p);
 125                 free(p);
 126                 return c->ecdsa;
 127         }
 128
 129         /* Else, check for Ed25519PublicKeyFile statement and read it */
 130
 131         if(!get_config_string(lookup_config(c->config_tree, "Ed25519PublicKeyFile"), &fname))
 132                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 133
 134         fp = fopen(fname, "r");
 135
 136         if(!fp) {
 137                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 public key file `%s': %s",
 138                            fname, strerror(errno));
 139                 free(fname);
 140                 return false;
 141         }
 142
 143         c->ecdsa = ecdsa_read_pem_public_key(fp);
 144
 145         if(!c->ecdsa && errno != ENOENT)
 146                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing Ed25519 public key file `%s' failed.", fname);
 147
 148         fclose(fp);
 149         free(fname);
 150         return c->ecdsa;
 151 }
 152
 153 #ifndef DISABLE_LEGACY
 154 bool read_rsa_public_key(connection_t *c) {
 155         FILE *fp;
 156         char *fname;
 157         char *n;
 158
 159         /* First, check for simple PublicKey statement */
 160
 161         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 162                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 163                 free(n);
 164                 return c->rsa;
 165         }
 166
 167         /* Else, check for PublicKeyFile statement and read it */
 168
 169         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 170                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 171
 172         fp = fopen(fname, "r");
 173
 174         if(!fp) {
 175                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 176                 free(fname);
 177                 return false;
 178         }
 179
 180         c->rsa = rsa_read_pem_public_key(fp);
 181         fclose(fp);
 182
 183         if(!c->rsa)
 184                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 185         free(fname);
 186         return c->rsa;
 187 }
 188 #endif
 189
 190 static bool read_ecdsa_private_key(void) {
 191         FILE *fp;
 192         char *fname;
 193
 194         /* Check for PrivateKeyFile statement and read it */
 195
 196         if(!get_config_string(lookup_config(config_tree, "Ed25519PrivateKeyFile"), &fname))
 197                 xasprintf(&fname, "%s" SLASH "ed25519_key.priv", confbase);
 198
 199         fp = fopen(fname, "r");
 200
 201         if(!fp) {
 202                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 private key file `%s': %s", fname, strerror(errno));
 203                 if(errno == ENOENT)
 204                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an Ed25519 keypair with `tinc -n %s generate-ed25519-keys'.", netname ?: ".");
 205                 free(fname);
 206                 return false;
 207         }
 208
 209 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 210         struct stat s;
 211
 212         if(fstat(fileno(fp), &s)) {
 213                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat Ed25519 private key file `%s': %s'", fname, strerror(errno));
 214                 free(fname);
 215                 return false;
 216         }
 217
 218         if(s.st_mode & ~0100700)
 219                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for Ed25519 private key file `%s'!", fname);
 220 #endif
 221
 222         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 223         fclose(fp);
 224
 225         if(!myself->connection->ecdsa)
 226                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 227         free(fname);
 228         return myself->connection->ecdsa;
 229 }
 230
 231 static bool read_invitation_key(void) {
 232         FILE *fp;
 233         char fname[PATH_MAX];
 234
 235         if(invitation_key) {
 236                 ecdsa_free(invitation_key);
 237                 invitation_key = NULL;
 238         }
 239
 240         snprintf(fname, sizeof fname, "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
 241
 242         fp = fopen(fname, "r");
 243
 244         if(fp) {
 245                 invitation_key = ecdsa_read_pem_private_key(fp);
 246                 fclose(fp);
 247                 if(!invitation_key)
 248                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 249         }
 250
 251         return invitation_key;
 252 }
 253
 254 #ifndef DISABLE_LEGACY
 255 static bool read_rsa_private_key(void) {
 256         FILE *fp;
 257         char *fname;
 258         char *n, *d;
 259
 260         /* First, check for simple PrivateKey statement */
 261
 262         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 263                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 264                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 265                         free(d);
 266                         return false;
 267                 }
 268                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 269                 free(n);
 270                 free(d);
 271                 return myself->connection->rsa;
 272         }
 273
 274         /* Else, check for PrivateKeyFile statement and read it */
 275
 276         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 277                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 278
 279         fp = fopen(fname, "r");
 280
 281         if(!fp) {
 282                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 283                            fname, strerror(errno));
 284                 if(errno == ENOENT)
 285                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an RSA keypair with `tinc -n %s generate-rsa-keys'.", netname ?: ".");
 286                 free(fname);
 287                 return false;
 288         }
 289
 290 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 291         struct stat s;
 292
 293         if(fstat(fileno(fp), &s)) {
 294                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 295                 free(fname);
 296                 return false;
 297         }
 298
 299         if(s.st_mode & ~0100700)
 300                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 301 #endif
 302
 303         myself->connection->rsa = rsa_read_pem_private_key(fp);
 304         fclose(fp);
 305
 306         if(!myself->connection->rsa)
 307                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 308         free(fname);
 309         return myself->connection->rsa;
 310 }
 311 #endif
 312
 313 static timeout_t keyexpire_timeout;
 314
 315 static void keyexpire_handler(void *data) {
 316         regenerate_key();
 317         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 318 }
 319
 320 void regenerate_key(void) {
 321         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 322         send_key_changed();
 323         for splay_each(node_t, n, node_tree)
 324                 n->status.validkey_in = false;
 325 }
 326
 327 void load_all_nodes(void) {
 328         DIR *dir;
 329         struct dirent *ent;
 330         char dname[PATH_MAX];
 331
 332         snprintf(dname, sizeof 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                 return;
 337         }
 338
 339         while((ent = readdir(dir))) {
 340                 if(!check_id(ent->d_name))
 341                         continue;
 342
 343                 node_t *n = lookup_node(ent->d_name);
 344
 345                 splay_tree_t *config_tree;
 346                 init_configuration(&config_tree);
 347                 read_config_options(config_tree, ent->d_name);
 348                 read_host_config(config_tree, ent->d_name);
 349
 350                 if(!n) {
 351                         n = new_node();
 352                         n->name = xstrdup(ent->d_name);
 353                         node_add(n);
 354                 }
 355
 356                 if(strictsubnets) {
 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                                         free(s);
 366                                 } else {
 367                                         subnet_add(n, s);
 368                                 }
 369                         }
 370                 }
 371
 372                 if(lookup_config(config_tree, "Address"))
 373                         n->status.has_address = true;
 374
 375                 exit_configuration(&config_tree);
 376         }
 377
 378         closedir(dir);
 379 }
 380
 381 char *get_name(void) {
 382         char *name = NULL;
 383         char *returned_name;
 384
 385         get_config_string(lookup_config(config_tree, "Name"), &name);
 386
 387         if(!name)
 388                 return NULL;
 389
 390         returned_name = replace_name(name);
 391         free(name);
 392         return returned_name;
 393 }
 394
 395 bool setup_myself_reloadable(void) {
 396         char *proxy = NULL;
 397         char *rmode = NULL;
 398         char *fmode = NULL;
 399         char *bmode = NULL;
 400         char *afname = NULL;
 401         char *space;
 402         bool choice;
 403
 404         free(scriptinterpreter);
 405         scriptinterpreter = NULL;
 406         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 407
 408
 409         free(scriptextension);
 410         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 411                 scriptextension = xstrdup("");
 412
 413         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 414         if(proxy) {
 415                 if((space = strchr(proxy, ' ')))
 416                         *space++ = 0;
 417
 418                 if(!strcasecmp(proxy, "none")) {
 419                         proxytype = PROXY_NONE;
 420                 } else if(!strcasecmp(proxy, "socks4")) {
 421                         proxytype = PROXY_SOCKS4;
 422                 } else if(!strcasecmp(proxy, "socks4a")) {
 423                         proxytype = PROXY_SOCKS4A;
 424                 } else if(!strcasecmp(proxy, "socks5")) {
 425                         proxytype = PROXY_SOCKS5;
 426                 } else if(!strcasecmp(proxy, "http")) {
 427                         proxytype = PROXY_HTTP;
 428                 } else if(!strcasecmp(proxy, "exec")) {
 429                         proxytype = PROXY_EXEC;
 430                 } else {
 431                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 432                         return false;
 433                 }
 434
 435                 switch(proxytype) {
 436                         case PROXY_NONE:
 437                         default:
 438                                 break;
 439
 440                         case PROXY_EXEC:
 441                                 if(!space || !*space) {
 442                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 443                                         return false;
 444                                 }
 445                                 proxyhost =  xstrdup(space);
 446                                 break;
 447
 448                         case PROXY_SOCKS4:
 449                         case PROXY_SOCKS4A:
 450                         case PROXY_SOCKS5:
 451                         case PROXY_HTTP:
 452                                 proxyhost = space;
 453                                 if(space && (space = strchr(space, ' ')))
 454                                         *space++ = 0, proxyport = space;
 455                                 if(space && (space = strchr(space, ' ')))
 456                                         *space++ = 0, proxyuser = space;
 457                                 if(space && (space = strchr(space, ' ')))
 458                                         *space++ = 0, proxypass = space;
 459                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 460                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 461                                         return false;
 462                                 }
 463                                 proxyhost = xstrdup(proxyhost);
 464                                 proxyport = xstrdup(proxyport);
 465                                 if(proxyuser && *proxyuser)
 466                                         proxyuser = xstrdup(proxyuser);
 467                                 if(proxypass && *proxypass)
 468                                         proxypass = xstrdup(proxypass);
 469                                 break;
 470                 }
 471
 472                 free(proxy);
 473         }
 474
 475         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 476                 myself->options |= OPTION_INDIRECT;
 477
 478         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 479                 myself->options |= OPTION_TCPONLY;
 480
 481         if(myself->options & OPTION_TCPONLY)
 482                 myself->options |= OPTION_INDIRECT;
 483
 484         get_config_bool(lookup_config(config_tree, "UDPDiscovery"), &udp_discovery);
 485         get_config_int(lookup_config(config_tree, "UDPDiscoveryKeepaliveInterval"), &udp_discovery_keepalive_interval);
 486         get_config_int(lookup_config(config_tree, "UDPDiscoveryInterval"), &udp_discovery_interval);
 487         get_config_int(lookup_config(config_tree, "UDPDiscoveryTimeout"), &udp_discovery_timeout);
 488
 489         get_config_int(lookup_config(config_tree, "MTUInfoInterval"), &mtu_info_interval);
 490         get_config_int(lookup_config(config_tree, "UDPInfoInterval"), &udp_info_interval);
 491
 492         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 493         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 494
 495         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 496                 if(!strcasecmp(rmode, "router"))
 497                         routing_mode = RMODE_ROUTER;
 498                 else if(!strcasecmp(rmode, "switch"))
 499                         routing_mode = RMODE_SWITCH;
 500                 else if(!strcasecmp(rmode, "hub"))
 501                         routing_mode = RMODE_HUB;
 502                 else {
 503                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 504                         return false;
 505                 }
 506                 free(rmode);
 507         }
 508
 509         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 510                 if(!strcasecmp(fmode, "off"))
 511                         forwarding_mode = FMODE_OFF;
 512                 else if(!strcasecmp(fmode, "internal"))
 513                         forwarding_mode = FMODE_INTERNAL;
 514                 else if(!strcasecmp(fmode, "kernel"))
 515                         forwarding_mode = FMODE_KERNEL;
 516                 else {
 517                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 518                         return false;
 519                 }
 520                 free(fmode);
 521         }
 522
 523         choice = true;
 524         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 525         if(choice)
 526                 myself->options |= OPTION_PMTU_DISCOVERY;
 527
 528         choice = true;
 529         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 530         if(choice)
 531                 myself->options |= OPTION_CLAMP_MSS;
 532
 533         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 534         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 535         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 536                 if(!strcasecmp(bmode, "no"))
 537                         broadcast_mode = BMODE_NONE;
 538                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 539                         broadcast_mode = BMODE_MST;
 540                 else if(!strcasecmp(bmode, "direct"))
 541                         broadcast_mode = BMODE_DIRECT;
 542                 else {
 543                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 544                         return false;
 545                 }
 546                 free(bmode);
 547         }
 548
 549         const char* const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
 550         for (size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
 551                 subnet_t *s = new_subnet();
 552                 if (!str2net(s, DEFAULT_BROADCAST_SUBNETS[i]))
 553                         abort();
 554                 subnet_add(NULL, s);
 555         }
 556         for (config_t* cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 557                 subnet_t *s;
 558                 if (!get_config_subnet(cfg, &s))
 559                         continue;
 560                 subnet_add(NULL, s);
 561         }
 562
 563 #if !defined(IPPROTO_IP) || !defined(IP_TOS)
 564         if(priorityinheritance)
 565                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv4 connections", "PriorityInheritance");
 566 #endif
 567
 568 #if !defined(IPPROTO_IPV6) || !defined(IPV6_TCLASS)
 569         if(priorityinheritance)
 570                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv6 connections", "PriorityInheritance");
 571 #endif
 572
 573         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 574                 macexpire = 600;
 575
 576         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 577                 if(maxtimeout <= 0) {
 578                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 579                         return false;
 580                 }
 581         } else
 582                 maxtimeout = 900;
 583
 584         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 585                 if(!strcasecmp(afname, "IPv4"))
 586                         addressfamily = AF_INET;
 587                 else if(!strcasecmp(afname, "IPv6"))
 588                         addressfamily = AF_INET6;
 589                 else if(!strcasecmp(afname, "any"))
 590                         addressfamily = AF_UNSPEC;
 591                 else {
 592                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 593                         return false;
 594                 }
 595                 free(afname);
 596         }
 597
 598         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 599
 600         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 601                 keylifetime = 3600;
 602
 603         config_t *cfg = lookup_config(config_tree, "AutoConnect");
 604         if(cfg) {
 605                 if(!get_config_bool(cfg, &autoconnect)) {
 606                         // Some backwards compatibility with when this option was an int
 607                         int val = 0;
 608                         get_config_int(cfg, &val);
 609                         autoconnect = val;
 610                 }
 611         }
 612
 613         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 614
 615         read_invitation_key();
 616
 617         return true;
 618 }
 619
 620 /*
 621   Add listening sockets.
 622 */
 623 static bool add_listen_address(char *address, bool bindto) {
 624         char *port = myport;
 625
 626         if(address) {
 627                 char *space = strchr(address, ' ');
 628                 if(space) {
 629                         *space++ = 0;
 630                         port = space;
 631                 }
 632
 633                 if(!strcmp(address, "*"))
 634                         *address = 0;
 635         }
 636
 637         struct addrinfo *ai, hint = {0};
 638         hint.ai_family = addressfamily;
 639         hint.ai_socktype = SOCK_STREAM;
 640         hint.ai_protocol = IPPROTO_TCP;
 641         hint.ai_flags = AI_PASSIVE;
 642
 643 #if HAVE_DECL_RES_INIT
 644         res_init();
 645 #endif
 646         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 647         free(address);
 648
 649         if(err || !ai) {
 650                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 651                 return false;
 652         }
 653
 654         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 655                 // Ignore duplicate addresses
 656                 bool found = false;
 657
 658                 for(int i = 0; i < listen_sockets; i++)
 659                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 660                                 found = true;
 661                                 break;
 662                         }
 663
 664                 if(found)
 665                         continue;
 666
 667                 if(listen_sockets >= MAXSOCKETS) {
 668                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 669                         return false;
 670                 }
 671
 672                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 673
 674                 if(tcp_fd < 0)
 675                         continue;
 676
 677                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 678
 679                 if(udp_fd < 0) {
 680                         close(tcp_fd);
 681                         continue;
 682                 }
 683
 684                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 685                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 686
 687                 if(debug_level >= DEBUG_CONNECTIONS) {
 688                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 689                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 690                         free(hostname);
 691                 }
 692
 693                 listen_socket[listen_sockets].bindto = bindto;
 694                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 695                 listen_sockets++;
 696         }
 697
 698         freeaddrinfo(ai);
 699         return true;
 700 }
 701
 702 void device_enable(void) {
 703         if (devops.enable)
 704                 devops.enable();
 705
 706         /* Run tinc-up script to further initialize the tap interface */
 707
 708         char *envp[5] = {NULL};
 709         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 710         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 711         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 712         xasprintf(&envp[3], "NAME=%s", myname);
 713
 714         execute_script("tinc-up", envp);
 715
 716         for(int i = 0; i < 4; i++)
 717                 free(envp[i]);
 718 }
 719
 720 void device_disable(void) {
 721         char *envp[5] = {NULL};
 722         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 723         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 724         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 725         xasprintf(&envp[3], "NAME=%s", myname);
 726
 727         execute_script("tinc-down", envp);
 728
 729         for(int i = 0; i < 4; i++)
 730                 free(envp[i]);
 731
 732         if (devops.disable)
 733                 devops.disable();
 734 }
 735
 736 /*
 737   Configure node_t myself and set up the local sockets (listen only)
 738 */
 739 static bool setup_myself(void) {
 740         char *name, *hostname, *cipher, *digest, *type;
 741         char *address = NULL;
 742         bool port_specified = false;
 743
 744         if(!(name = get_name())) {
 745                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 746                 return false;
 747         }
 748
 749         myname = xstrdup(name);
 750         myself = new_node();
 751         myself->connection = new_connection();
 752         myself->name = name;
 753         myself->connection->name = xstrdup(name);
 754         read_host_config(config_tree, name);
 755
 756         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 757                 myport = xstrdup("655");
 758         else
 759                 port_specified = true;
 760
 761         myself->connection->options = 0;
 762         myself->connection->protocol_major = PROT_MAJOR;
 763         myself->connection->protocol_minor = PROT_MINOR;
 764
 765         myself->options |= PROT_MINOR << 24;
 766
 767 #ifdef DISABLE_LEGACY
 768         experimental = read_ecdsa_private_key();
 769         if(!experimental) {
 770                 logger(DEBUG_ALWAYS, LOG_ERR, "No private key available, cannot start tinc!");
 771                 return false;
 772         }
 773 #else
 774         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 775                 experimental = read_ecdsa_private_key();
 776                 if(!experimental)
 777                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 778         } else {
 779                 if(experimental && !read_ecdsa_private_key())
 780                         return false;
 781         }
 782
 783         if(!read_rsa_private_key()) {
 784                 if(experimental) {
 785                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for legacy protocol disabled.");
 786                 } else {
 787                         logger(DEBUG_ALWAYS, LOG_ERR, "No private keys available, cannot start tinc!");
 788                         return false;
 789                 }
 790         }
 791 #endif
 792
 793         /* Ensure myport is numeric */
 794
 795         if(!atoi(myport)) {
 796                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 797                 sockaddr_t sa;
 798                 if(!ai || !ai->ai_addr)
 799                         return false;
 800                 free(myport);
 801                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 802                 sockaddr2str(&sa, NULL, &myport);
 803         }
 804
 805         /* Read in all the subnets specified in the host configuration file */
 806
 807         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 808                 subnet_t *subnet;
 809
 810                 if(!get_config_subnet(cfg, &subnet))
 811                         return false;
 812
 813                 subnet_add(myself, subnet);
 814         }
 815
 816         /* Check some options */
 817
 818         if(!setup_myself_reloadable())
 819                 return false;
 820
 821         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 822         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 823         strictsubnets |= tunnelserver;
 824
 825         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 826                 if(max_connection_burst <= 0) {
 827                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 828                         return false;
 829                 }
 830         }
 831
 832         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 833                 if(udp_rcvbuf < 0) {
 834                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 835                         return false;
 836                 }
 837         }
 838
 839         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 840                 if(udp_sndbuf < 0) {
 841                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 842                         return false;
 843                 }
 844         }
 845
 846         int replaywin_int;
 847         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 848                 if(replaywin_int < 0) {
 849                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 850                         return false;
 851                 }
 852                 replaywin = (unsigned)replaywin_int;
 853                 sptps_replaywin = replaywin;
 854         }
 855
 856 #ifndef DISABLE_LEGACY
 857         /* Generate packet encryption key */
 858
 859         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 860                 cipher = xstrdup("aes-256-cbc");
 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("sha256");
 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 #endif
 895
 896         /* Compression */
 897
 898         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 899                 if(myself->incompression < 0 || myself->incompression > 11) {
 900                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 901                         return false;
 902                 }
 903         } else
 904                 myself->incompression = 0;
 905
 906         myself->connection->outcompression = 0;
 907
 908         /* Done */
 909
 910         myself->nexthop = myself;
 911         myself->via = myself;
 912         myself->status.reachable = true;
 913         myself->last_state_change = now.tv_sec;
 914         myself->status.sptps = experimental;
 915         node_add(myself);
 916
 917         graph();
 918
 919         load_all_nodes();
 920
 921         /* Open device */
 922
 923         devops = os_devops;
 924
 925         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 926                 if(!strcasecmp(type, "dummy"))
 927                         devops = dummy_devops;
 928                 else if(!strcasecmp(type, "raw_socket"))
 929                         devops = raw_socket_devops;
 930                 else if(!strcasecmp(type, "multicast"))
 931                         devops = multicast_devops;
 932                 else if(!strcasecmp(type, "fd"))
 933                         devops = fd_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                 free(type);
 943         }
 944
 945         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
 946
 947         if(!devops.setup())
 948                 return false;
 949
 950         if(device_fd >= 0)
 951                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 952
 953         /* Open sockets */
 954
 955         if(!do_detach && getenv("LISTEN_FDS")) {
 956                 sockaddr_t sa;
 957                 socklen_t salen;
 958
 959                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 960 #ifdef HAVE_UNSETENV
 961                 unsetenv("LISTEN_FDS");
 962 #endif
 963
 964                 if(listen_sockets > MAXSOCKETS) {
 965                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 966                         return false;
 967                 }
 968
 969                 for(int i = 0; i < listen_sockets; i++) {
 970                         salen = sizeof sa;
 971                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 972                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
 973                                 return false;
 974                         }
 975
 976 #ifdef FD_CLOEXEC
 977                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 978 #endif
 979
 980                         int udp_fd = setup_vpn_in_socket(&sa);
 981                         if(udp_fd < 0)
 982                                 return false;
 983
 984                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
 985                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
 986
 987                         if(debug_level >= DEBUG_CONNECTIONS) {
 988                                 hostname = sockaddr2hostname(&sa);
 989                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 990                                 free(hostname);
 991                         }
 992
 993                         memcpy(&listen_socket[i].sa, &sa, salen);
 994                 }
 995         } else {
 996                 listen_sockets = 0;
 997                 int cfgs = 0;
 998
 999                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1000                         cfgs++;
1001                         get_config_string(cfg, &address);
1002                         if(!add_listen_address(address, true))
1003                                 return false;
1004                 }
1005
1006                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1007                         cfgs++;
1008                         get_config_string(cfg, &address);
1009                         if(!add_listen_address(address, false))
1010                                 return false;
1011                 }
1012
1013                 if(!cfgs)
1014                         if(!add_listen_address(address, NULL))
1015                                 return false;
1016         }
1017
1018         if(!listen_sockets) {
1019                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1020                 return false;
1021         }
1022
1023         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1024
1025         if(!port_specified || atoi(myport) == 0) {
1026                 sockaddr_t sa;
1027                 socklen_t salen = sizeof sa;
1028                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1029                         free(myport);
1030                         sockaddr2str(&sa, NULL, &myport);
1031                         if(!myport)
1032                                 myport = xstrdup("655");
1033                 }
1034         }
1035
1036         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1037         myself->connection->hostname = xstrdup(myself->hostname);
1038
1039         char *upnp = NULL;
1040         get_config_string(lookup_config(config_tree, "UPnP"), &upnp);
1041         bool upnp_tcp = false;
1042         bool upnp_udp = false;
1043         if (upnp) {
1044                 if (!strcasecmp(upnp, "yes"))
1045                         upnp_tcp = upnp_udp = true;
1046                 else if (!strcasecmp(upnp, "udponly"))
1047                         upnp_udp = true;
1048                 free(upnp);
1049         }
1050         if (upnp_tcp || upnp_udp) {
1051 #ifdef HAVE_MINIUPNPC
1052                 upnp_init(upnp_tcp, upnp_udp);
1053 #else
1054                 logger(DEBUG_ALWAYS, LOG_WARNING, "UPnP was requested, but tinc isn't built with miniupnpc support!");
1055 #endif
1056         }
1057
1058         /* Done. */
1059
1060         last_config_check = now.tv_sec;
1061
1062         return true;
1063 }
1064
1065 /*
1066   initialize network
1067 */
1068 bool setup_network(void) {
1069         init_connections();
1070         init_subnets();
1071         init_nodes();
1072         init_edges();
1073         init_requests();
1074
1075         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1076                 if(pinginterval < 1) {
1077                         pinginterval = 86400;
1078                 }
1079         } else
1080                 pinginterval = 60;
1081
1082         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
1083                 pingtimeout = 5;
1084         if(pingtimeout < 1 || pingtimeout > pinginterval)
1085                 pingtimeout = pinginterval;
1086
1087         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
1088                 maxoutbufsize = 10 * MTU;
1089
1090         if(!setup_myself())
1091                 return false;
1092
1093         if(!init_control())
1094                 return false;
1095
1096         if (!device_standby)
1097                 device_enable();
1098
1099         /* Run subnet-up scripts for our own subnets */
1100
1101         subnet_update(myself, NULL, true);
1102
1103         return true;
1104 }
1105
1106 /*
1107   close all open network connections
1108 */
1109 void close_network_connections(void) {
1110         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1111                 next = node->next;
1112                 connection_t *c = node->data;
1113                 /* Keep control connections open until the end, so they know when we really terminated */
1114                 if(c->status.control)
1115                         c->socket = -1;
1116                 c->outgoing = NULL;
1117                 terminate_connection(c, false);
1118         }
1119
1120         if(outgoing_list)
1121                 list_delete_list(outgoing_list);
1122
1123         if(myself && myself->connection) {
1124                 subnet_update(myself, NULL, false);
1125                 connection_del(myself->connection);
1126         }
1127
1128         for(int i = 0; i < listen_sockets; i++) {
1129                 io_del(&listen_socket[i].tcp);
1130                 io_del(&listen_socket[i].udp);
1131                 close(listen_socket[i].tcp.fd);
1132                 close(listen_socket[i].udp.fd);
1133         }
1134
1135         exit_requests();
1136         exit_edges();
1137         exit_subnets();
1138         exit_nodes();
1139         exit_connections();
1140
1141         if (!device_standby)
1142                 device_disable();
1143
1144         free(myport);
1145
1146         if (device_fd >= 0)
1147                 io_del(&device_io);
1148         if (devops.close)
1149                 devops.close();
1150
1151         exit_control();
1152
1153         free(myname);
1154         free(scriptextension);
1155         free(scriptinterpreter);
1156
1157         return;
1158 }