git.meshlink.io Git - meshlink/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 "digest.h"
  30 #include "ecdsa.h"
  31 #include "graph.h"
  32 #include "logger.h"
  33 #include "names.h"
  34 #include "net.h"
  35 #include "netutl.h"
  36 #include "process.h"
  37 #include "protocol.h"
  38 #include "route.h"
  39 #include "rsa.h"
  40 #include "script.h"
  41 #include "utils.h"
  42 #include "xalloc.h"
  43
  44 char *myport;
  45
  46 char *proxyhost;
  47 char *proxyport;
  48 char *proxyuser;
  49 char *proxypass;
  50 proxytype_t proxytype;
  51 int autoconnect;
  52 bool disablebuggypeers;
  53
  54 char *scriptinterpreter;
  55 char *scriptextension;
  56
  57 bool node_read_ecdsa_public_key(node_t *n) {
  58         if(ecdsa_active(n->ecdsa))
  59                 return true;
  60
  61         splay_tree_t *config_tree;
  62         FILE *fp;
  63         char *pubname = NULL;
  64         char *p;
  65
  66         init_configuration(&config_tree);
  67         if(!read_host_config(config_tree, n->name))
  68                 goto exit;
  69
  70         /* First, check for simple ECDSAPublicKey statement */
  71
  72         if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
  73                 n->ecdsa = ecdsa_set_base64_public_key(p);
  74                 free(p);
  75                 goto exit;
  76         }
  77
  78         /* Else, check for ECDSAPublicKeyFile statement and read it */
  79
  80         if(!get_config_string(lookup_config(config_tree, "ECDSAPublicKeyFile"), &pubname))
  81                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  82
  83         fp = fopen(pubname, "r");
  84
  85         if(!fp)
  86                 goto exit;
  87
  88         n->ecdsa = ecdsa_read_pem_public_key(fp);
  89         fclose(fp);
  90
  91 exit:
  92         exit_configuration(&config_tree);
  93         free(pubname);
  94         return n->ecdsa;
  95 }
  96
  97 bool read_ecdsa_public_key(connection_t *c) {
  98         if(ecdsa_active(c->ecdsa))
  99                 return true;
 100
 101         FILE *fp;
 102         char *fname;
 103         char *p;
 104
 105         if(!c->config_tree) {
 106                 init_configuration(&c->config_tree);
 107                 if(!read_host_config(c->config_tree, c->name))
 108                         return false;
 109         }
 110
 111         /* First, check for simple ECDSAPublicKey statement */
 112
 113         if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
 114                 c->ecdsa = ecdsa_set_base64_public_key(p);
 115                 free(p);
 116                 return c->ecdsa;
 117         }
 118
 119         /* Else, check for ECDSAPublicKeyFile statement and read it */
 120
 121         if(!get_config_string(lookup_config(c->config_tree, "ECDSAPublicKeyFile"), &fname))
 122                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 123
 124         fp = fopen(fname, "r");
 125
 126         if(!fp) {
 127                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s",
 128                            fname, strerror(errno));
 129                 free(fname);
 130                 return false;
 131         }
 132
 133         c->ecdsa = ecdsa_read_pem_public_key(fp);
 134         fclose(fp);
 135
 136         if(!c->ecdsa)
 137                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing ECDSA public key file `%s' failed.", fname);
 138         free(fname);
 139         return c->ecdsa;
 140 }
 141
 142 bool read_rsa_public_key(connection_t *c) {
 143         if(ecdsa_active(c->ecdsa))
 144                 return true;
 145
 146         FILE *fp;
 147         char *fname;
 148         char *n;
 149
 150         /* First, check for simple PublicKey statement */
 151
 152         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 153                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 154                 free(n);
 155                 return c->rsa;
 156         }
 157
 158         /* Else, check for PublicKeyFile statement and read it */
 159
 160         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 161                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 162
 163         fp = fopen(fname, "r");
 164
 165         if(!fp) {
 166                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 167                 free(fname);
 168                 return false;
 169         }
 170
 171         c->rsa = rsa_read_pem_public_key(fp);
 172         fclose(fp);
 173
 174         if(!c->rsa)
 175                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 176         free(fname);
 177         return c->rsa;
 178 }
 179
 180 static bool read_ecdsa_private_key(void) {
 181         FILE *fp;
 182         char *fname;
 183
 184         /* Check for PrivateKeyFile statement and read it */
 185
 186         if(!get_config_string(lookup_config(config_tree, "ECDSAPrivateKeyFile"), &fname))
 187                 xasprintf(&fname, "%s" SLASH "ecdsa_key.priv", confbase);
 188
 189         fp = fopen(fname, "r");
 190
 191         if(!fp) {
 192                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA private key file `%s': %s", fname, strerror(errno));
 193                 if(errno == ENOENT)
 194                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an ECDSA keypair with `tinc -n %s generate-ecdsa-keys'.", netname ?: ".");
 195                 free(fname);
 196                 return false;
 197         }
 198
 199 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 200         struct stat s;
 201
 202         if(fstat(fileno(fp), &s)) {
 203                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat ECDSA private key file `%s': %s'", fname, strerror(errno));
 204                 free(fname);
 205                 return false;
 206         }
 207
 208         if(s.st_mode & ~0100700)
 209                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for ECDSA private key file `%s'!", fname);
 210 #endif
 211
 212         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 213         fclose(fp);
 214
 215         if(!myself->connection->ecdsa)
 216                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 217         free(fname);
 218         return myself->connection->ecdsa;
 219 }
 220
 221 static bool read_invitation_key(void) {
 222         FILE *fp;
 223         char *fname;
 224
 225         if(invitation_key) {
 226                 ecdsa_free(invitation_key);
 227                 invitation_key = NULL;
 228         }
 229
 230         xasprintf(&fname, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", confbase);
 231
 232         fp = fopen(fname, "r");
 233
 234         if(fp) {
 235                 invitation_key = ecdsa_read_pem_private_key(fp);
 236                 fclose(fp);
 237                 if(!invitation_key)
 238                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 239         }
 240
 241         free(fname);
 242         return invitation_key;
 243 }
 244
 245 static bool read_rsa_private_key(void) {
 246         FILE *fp;
 247         char *fname;
 248         char *n, *d;
 249
 250         /* First, check for simple PrivateKey statement */
 251
 252         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 253                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 254                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 255                         free(d);
 256                         return false;
 257                 }
 258                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 259                 free(n);
 260                 free(d);
 261                 return myself->connection->rsa;
 262         }
 263
 264         /* Else, check for PrivateKeyFile statement and read it */
 265
 266         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 267                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 268
 269         fp = fopen(fname, "r");
 270
 271         if(!fp) {
 272                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 273                            fname, strerror(errno));
 274                 free(fname);
 275                 return false;
 276         }
 277
 278 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 279         struct stat s;
 280
 281         if(fstat(fileno(fp), &s)) {
 282                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 283                 free(fname);
 284                 return false;
 285         }
 286
 287         if(s.st_mode & ~0100700)
 288                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 289 #endif
 290
 291         myself->connection->rsa = rsa_read_pem_private_key(fp);
 292         fclose(fp);
 293
 294         if(!myself->connection->rsa)
 295                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 296         free(fname);
 297         return myself->connection->rsa;
 298 }
 299
 300 static timeout_t keyexpire_timeout;
 301
 302 static void keyexpire_handler(void *data) {
 303         regenerate_key();
 304         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 305 }
 306
 307 void regenerate_key(void) {
 308         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 309         send_key_changed();
 310 }
 311
 312 void load_all_nodes(void) {
 313         DIR *dir;
 314         struct dirent *ent;
 315         char *dname;
 316
 317         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 318         dir = opendir(dname);
 319         if(!dir) {
 320                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 321                 free(dname);
 322                 return;
 323         }
 324
 325         while((ent = readdir(dir))) {
 326                 if(!check_id(ent->d_name))
 327                         continue;
 328
 329                 node_t *n = lookup_node(ent->d_name);
 330                 if(n)
 331                         continue;
 332
 333                 n = new_node();
 334                 n->name = xstrdup(ent->d_name);
 335                 node_add(n);
 336         }
 337
 338         closedir(dir);
 339 }
 340
 341
 342 char *get_name(void) {
 343         char *name = NULL;
 344
 345         get_config_string(lookup_config(config_tree, "Name"), &name);
 346
 347         if(!name)
 348                 return NULL;
 349
 350         if(*name == '$') {
 351                 char *envname = getenv(name + 1);
 352                 char hostname[32] = "";
 353                 if(!envname) {
 354                         if(strcmp(name + 1, "HOST")) {
 355                                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1);
 356                                 return false;
 357                         }
 358                         if(gethostname(hostname, sizeof hostname) || !*hostname) {
 359                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", strerror(errno));
 360                                 return false;
 361                         }
 362                         hostname[31] = 0;
 363                         envname = hostname;
 364                 }
 365                 free(name);
 366                 name = xstrdup(envname);
 367                 for(char *c = name; *c; c++)
 368                         if(!isalnum(*c))
 369                                 *c = '_';
 370         }
 371
 372         if(!check_id(name)) {
 373                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
 374                 free(name);
 375                 return false;
 376         }
 377
 378         return name;
 379 }
 380
 381 bool setup_myself_reloadable(void) {
 382         char *proxy = NULL;
 383         char *rmode = NULL;
 384         char *fmode = NULL;
 385         char *bmode = NULL;
 386         char *afname = NULL;
 387         char *address = NULL;
 388         char *space;
 389         bool choice;
 390
 391         free(scriptinterpreter);
 392         scriptinterpreter = NULL;
 393         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 394
 395
 396         free(scriptextension);
 397         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 398                 scriptextension = xstrdup("");
 399
 400         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 401         if(proxy) {
 402                 if((space = strchr(proxy, ' ')))
 403                         *space++ = 0;
 404
 405                 if(!strcasecmp(proxy, "none")) {
 406                         proxytype = PROXY_NONE;
 407                 } else if(!strcasecmp(proxy, "socks4")) {
 408                         proxytype = PROXY_SOCKS4;
 409                 } else if(!strcasecmp(proxy, "socks4a")) {
 410                         proxytype = PROXY_SOCKS4A;
 411                 } else if(!strcasecmp(proxy, "socks5")) {
 412                         proxytype = PROXY_SOCKS5;
 413                 } else if(!strcasecmp(proxy, "http")) {
 414                         proxytype = PROXY_HTTP;
 415                 } else if(!strcasecmp(proxy, "exec")) {
 416                         proxytype = PROXY_EXEC;
 417                 } else {
 418                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 419                         return false;
 420                 }
 421
 422                 switch(proxytype) {
 423                         case PROXY_NONE:
 424                         default:
 425                                 break;
 426
 427                         case PROXY_EXEC:
 428                                 if(!space || !*space) {
 429                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 430                                         return false;
 431                                 }
 432                                 proxyhost =  xstrdup(space);
 433                                 break;
 434
 435                         case PROXY_SOCKS4:
 436                         case PROXY_SOCKS4A:
 437                         case PROXY_SOCKS5:
 438                         case PROXY_HTTP:
 439                                 proxyhost = space;
 440                                 if(space && (space = strchr(space, ' ')))
 441                                         *space++ = 0, proxyport = space;
 442                                 if(space && (space = strchr(space, ' ')))
 443                                         *space++ = 0, proxyuser = space;
 444                                 if(space && (space = strchr(space, ' ')))
 445                                         *space++ = 0, proxypass = space;
 446                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 447                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 448                                         return false;
 449                                 }
 450                                 proxyhost = xstrdup(proxyhost);
 451                                 proxyport = xstrdup(proxyport);
 452                                 if(proxyuser && *proxyuser)
 453                                         proxyuser = xstrdup(proxyuser);
 454                                 if(proxypass && *proxypass)
 455                                         proxypass = xstrdup(proxypass);
 456                                 break;
 457                 }
 458
 459                 free(proxy);
 460         }
 461
 462         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 463                 myself->options |= OPTION_INDIRECT;
 464
 465         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 466                 myself->options |= OPTION_TCPONLY;
 467
 468         if(myself->options & OPTION_TCPONLY)
 469                 myself->options |= OPTION_INDIRECT;
 470
 471         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 472         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 473
 474         memset(&localdiscovery_address, 0, sizeof localdiscovery_address);
 475         if(get_config_string(lookup_config(config_tree, "LocalDiscoveryAddress"), &address)) {
 476                 struct addrinfo *ai = str2addrinfo(address, myport, SOCK_DGRAM);
 477                 free(address);
 478                 if(!ai)
 479                         return false;
 480                 memcpy(&localdiscovery_address, ai->ai_addr, ai->ai_addrlen);
 481         }
 482
 483
 484         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 485                 if(!strcasecmp(rmode, "router"))
 486                         routing_mode = RMODE_ROUTER;
 487                 else if(!strcasecmp(rmode, "switch"))
 488                         routing_mode = RMODE_SWITCH;
 489                 else if(!strcasecmp(rmode, "hub"))
 490                         routing_mode = RMODE_HUB;
 491                 else {
 492                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 493                         return false;
 494                 }
 495                 free(rmode);
 496         }
 497
 498         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 499                 if(!strcasecmp(fmode, "off"))
 500                         forwarding_mode = FMODE_OFF;
 501                 else if(!strcasecmp(fmode, "internal"))
 502                         forwarding_mode = FMODE_INTERNAL;
 503                 else if(!strcasecmp(fmode, "kernel"))
 504                         forwarding_mode = FMODE_KERNEL;
 505                 else {
 506                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 507                         return false;
 508                 }
 509                 free(fmode);
 510         }
 511
 512         choice = true;
 513         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 514         if(choice)
 515                 myself->options |= OPTION_PMTU_DISCOVERY;
 516
 517         choice = true;
 518         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 519         if(choice)
 520                 myself->options |= OPTION_CLAMP_MSS;
 521
 522         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 523         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 524         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 525                 if(!strcasecmp(bmode, "no"))
 526                         broadcast_mode = BMODE_NONE;
 527                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 528                         broadcast_mode = BMODE_MST;
 529                 else if(!strcasecmp(bmode, "direct"))
 530                         broadcast_mode = BMODE_DIRECT;
 531                 else {
 532                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 533                         return false;
 534                 }
 535                 free(bmode);
 536         }
 537
 538 #if !defined(SOL_IP) || !defined(IP_TOS)
 539         if(priorityinheritance)
 540                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 541 #endif
 542
 543         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 544                 macexpire = 600;
 545
 546         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 547                 if(maxtimeout <= 0) {
 548                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 549                         return false;
 550                 }
 551         } else
 552                 maxtimeout = 900;
 553
 554         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 555                 if(!strcasecmp(afname, "IPv4"))
 556                         addressfamily = AF_INET;
 557                 else if(!strcasecmp(afname, "IPv6"))
 558                         addressfamily = AF_INET6;
 559                 else if(!strcasecmp(afname, "any"))
 560                         addressfamily = AF_UNSPEC;
 561                 else {
 562                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 563                         return false;
 564                 }
 565                 free(afname);
 566         }
 567
 568         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 569
 570         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 571                 keylifetime = 3600;
 572
 573         get_config_int(lookup_config(config_tree, "AutoConnect"), &autoconnect);
 574         if(autoconnect < 0)
 575                 autoconnect = 0;
 576
 577         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 578
 579         read_invitation_key();
 580
 581         return true;
 582 }
 583
 584 /*
 585   Add listening sockets.
 586 */
 587 static bool add_listen_address(char *address, bool bindto) {
 588         char *port = myport;
 589
 590         if(address) {
 591                 char *space = strchr(address, ' ');
 592                 if(space) {
 593                         *space++ = 0;
 594                         port = space;
 595                 }
 596
 597                 if(!strcmp(address, "*"))
 598                         *address = 0;
 599         }
 600
 601         struct addrinfo *ai, hint = {0};
 602         hint.ai_family = addressfamily;
 603         hint.ai_socktype = SOCK_STREAM;
 604         hint.ai_protocol = IPPROTO_TCP;
 605         hint.ai_flags = AI_PASSIVE;
 606
 607         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 608         free(address);
 609
 610         if(err || !ai) {
 611                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 612                 return false;
 613         }
 614
 615         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 616                 // Ignore duplicate addresses
 617                 bool found = false;
 618
 619                 for(int i = 0; i < listen_sockets; i++)
 620                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 621                                 found = true;
 622                                 break;
 623                         }
 624
 625                 if(found)
 626                         continue;
 627
 628                 if(listen_sockets >= MAXSOCKETS) {
 629                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 630                         return false;
 631                 }
 632
 633                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 634
 635                 if(tcp_fd < 0)
 636                         continue;
 637
 638                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 639
 640                 if(tcp_fd < 0) {
 641                         close(tcp_fd);
 642                         continue;
 643                 }
 644
 645                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 646                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 647
 648                 if(debug_level >= DEBUG_CONNECTIONS) {
 649                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 650                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 651                         free(hostname);
 652                 }
 653
 654                 listen_socket[listen_sockets].bindto = bindto;
 655                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 656                 listen_sockets++;
 657         }
 658
 659         freeaddrinfo(ai);
 660         return true;
 661 }
 662
 663 /*
 664   Configure node_t myself and set up the local sockets (listen only)
 665 */
 666 bool setup_myself(void) {
 667         char *name, *hostname, *cipher, *digest, *type;
 668         char *address = NULL;
 669         bool port_specified = false;
 670
 671         if(!(name = get_name())) {
 672                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 673                 return false;
 674         }
 675
 676         myself = new_node();
 677         myself->connection = new_connection();
 678         myself->name = name;
 679         myself->connection->name = xstrdup(name);
 680         read_host_config(config_tree, name);
 681
 682         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 683                 myport = xstrdup("655");
 684         else
 685                 port_specified = true;
 686
 687         myself->connection->options = 0;
 688         myself->connection->protocol_major = PROT_MAJOR;
 689         myself->connection->protocol_minor = PROT_MINOR;
 690
 691         myself->options |= PROT_MINOR << 24;
 692
 693         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 694                 experimental = read_ecdsa_private_key();
 695                 if(!experimental)
 696                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 697         } else {
 698                 if(experimental && !read_ecdsa_private_key())
 699                         return false;
 700         }
 701
 702         if(!read_rsa_private_key())
 703                 return false;
 704
 705         /* Ensure myport is numeric */
 706
 707         if(!atoi(myport)) {
 708                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 709                 sockaddr_t sa;
 710                 if(!ai || !ai->ai_addr)
 711                         return false;
 712                 free(myport);
 713                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 714                 sockaddr2str(&sa, NULL, &myport);
 715         }
 716
 717         /* Check some options */
 718
 719         if(!setup_myself_reloadable())
 720                 return false;
 721
 722         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 723
 724         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 725                 if(max_connection_burst <= 0) {
 726                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 727                         return false;
 728                 }
 729         }
 730
 731         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 732                 if(udp_rcvbuf <= 0) {
 733                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 734                         return false;
 735                 }
 736         }
 737
 738         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 739                 if(udp_sndbuf <= 0) {
 740                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 741                         return false;
 742                 }
 743         }
 744
 745         int replaywin_int;
 746         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 747                 if(replaywin_int < 0) {
 748                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 749                         return false;
 750                 }
 751                 replaywin = (unsigned)replaywin_int;
 752                 sptps_replaywin = replaywin;
 753         }
 754
 755         /* Generate packet encryption key */
 756
 757         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 758                 cipher = xstrdup("blowfish");
 759
 760         if(!strcasecmp(cipher, "none")) {
 761                 myself->incipher = NULL;
 762         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 763                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 764                 return false;
 765         }
 766
 767         free(cipher);
 768
 769         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 770
 771         /* Check if we want to use message authentication codes... */
 772
 773         int maclength = 4;
 774         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 775
 776         if(maclength < 0) {
 777                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 778                 return false;
 779         }
 780
 781         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 782                 digest = xstrdup("sha1");
 783
 784         if(!strcasecmp(digest, "none")) {
 785                 myself->indigest = NULL;
 786         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 787                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 788                 return false;
 789         }
 790
 791         free(digest);
 792
 793         /* Compression */
 794
 795         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 796                 if(myself->incompression < 0 || myself->incompression > 11) {
 797                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 798                         return false;
 799                 }
 800         } else
 801                 myself->incompression = 0;
 802
 803         myself->connection->outcompression = 0;
 804
 805         /* Done */
 806
 807         myself->nexthop = myself;
 808         myself->via = myself;
 809         myself->status.reachable = true;
 810         myself->last_state_change = now.tv_sec;
 811         myself->status.sptps = experimental;
 812         node_add(myself);
 813
 814         graph();
 815
 816         if(autoconnect)
 817                 load_all_nodes();
 818
 819         /* Open sockets */
 820
 821         if(!do_detach && getenv("LISTEN_FDS")) {
 822                 sockaddr_t sa;
 823                 socklen_t salen;
 824
 825                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 826 #ifdef HAVE_UNSETENV
 827                 unsetenv("LISTEN_FDS");
 828 #endif
 829
 830                 if(listen_sockets > MAXSOCKETS) {
 831                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 832                         return false;
 833                 }
 834
 835                 for(int i = 0; i < listen_sockets; i++) {
 836                         salen = sizeof sa;
 837                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 838                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
 839                                 return false;
 840                         }
 841
 842 #ifdef FD_CLOEXEC
 843                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 844 #endif
 845
 846                         int udp_fd = setup_vpn_in_socket(&sa);
 847                         if(udp_fd < 0)
 848                                 return false;
 849
 850                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
 851                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
 852
 853                         if(debug_level >= DEBUG_CONNECTIONS) {
 854                                 hostname = sockaddr2hostname(&sa);
 855                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 856                                 free(hostname);
 857                         }
 858
 859                         memcpy(&listen_socket[i].sa, &sa, salen);
 860                 }
 861         } else {
 862                 listen_sockets = 0;
 863                 int cfgs = 0;
 864
 865                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 866                         cfgs++;
 867                         get_config_string(cfg, &address);
 868                         if(!add_listen_address(address, true))
 869                                 return false;
 870                 }
 871
 872                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 873                         cfgs++;
 874                         get_config_string(cfg, &address);
 875                         if(!add_listen_address(address, false))
 876                                 return false;
 877                 }
 878
 879                 if(!cfgs)
 880                         if(!add_listen_address(address, NULL))
 881                                 return false;
 882         }
 883
 884         if(!listen_sockets) {
 885                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
 886                 return false;
 887         }
 888
 889         /* If no Port option was specified, set myport to the port used by the first listening socket. */
 890
 891         if(!port_specified) {
 892                 sockaddr_t sa;
 893                 socklen_t salen = sizeof sa;
 894                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
 895                         free(myport);
 896                         sockaddr2str(&sa, NULL, &myport);
 897                         if(!myport)
 898                                 myport = xstrdup("655");
 899                 }
 900         }
 901
 902         xasprintf(&myself->hostname, "MYSELF port %s", myport);
 903         myself->connection->hostname = xstrdup(myself->hostname);
 904
 905         /* Done. */
 906
 907         last_config_check = now.tv_sec;
 908
 909         return true;
 910 }
 911
 912 /*
 913   initialize network
 914 */
 915 bool setup_network(void) {
 916         init_connections();
 917         init_nodes();
 918         init_edges();
 919         init_requests();
 920
 921         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 922                 if(pinginterval < 1) {
 923                         pinginterval = 86400;
 924                 }
 925         } else
 926                 pinginterval = 60;
 927
 928         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 929                 pingtimeout = 5;
 930         if(pingtimeout < 1 || pingtimeout > pinginterval)
 931                 pingtimeout = pinginterval;
 932
 933         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 934                 maxoutbufsize = 10 * MTU;
 935
 936         if(!setup_myself())
 937                 return false;
 938
 939         if(!init_control())
 940                 return false;
 941
 942         /* Run tinc-up script to further initialize the tap interface */
 943
 944         char *envp[5] = {NULL};
 945         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 946         xasprintf(&envp[3], "NAME=%s", myself->name);
 947
 948         execute_script("tinc-up", envp);
 949
 950         for(int i = 0; i < 4; i++)
 951                 free(envp[i]);
 952
 953         return true;
 954 }
 955
 956 /*
 957   close all open network connections
 958 */
 959 void close_network_connections(void) {
 960         for(list_node_t *node = connection_list->head, *next; node; node = next) {
 961                 next = node->next;
 962                 connection_t *c = node->data;
 963                 /* Keep control connections open until the end, so they know when we really terminated */
 964                 if(c->status.control)
 965                         c->socket = -1;
 966                 c->outgoing = NULL;
 967                 terminate_connection(c, false);
 968         }
 969
 970         if(outgoing_list)
 971                 list_delete_list(outgoing_list);
 972
 973         if(myself && myself->connection) {
 974                 terminate_connection(myself->connection, false);
 975                 free_connection(myself->connection);
 976         }
 977
 978         for(int i = 0; i < listen_sockets; i++) {
 979                 io_del(&listen_socket[i].tcp);
 980                 io_del(&listen_socket[i].udp);
 981                 close(listen_socket[i].tcp.fd);
 982                 close(listen_socket[i].udp.fd);
 983         }
 984
 985         char *envp[5] = {NULL};
 986         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 987         xasprintf(&envp[3], "NAME=%s", myself->name);
 988
 989         exit_requests();
 990         exit_edges();
 991         exit_nodes();
 992         exit_connections();
 993
 994         execute_script("tinc-down", envp);
 995
 996         if(myport) free(myport);
 997
 998         for(int i = 0; i < 4; i++)
 999                 free(envp[i]);
1000
1001         exit_control();
1002
1003         return;
1004 }