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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2012 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 "net.h"
  35 #include "netutl.h"
  36 #include "process.h"
  37 #include "protocol.h"
  38 #include "route.h"
  39 #include "rsa.h"
  40 #include "subnet.h"
  41 #include "utils.h"
  42 #include "xalloc.h"
  43
  44 char *myport;
  45 static struct event device_ev;
  46 devops_t devops;
  47
  48 char *proxyhost;
  49 char *proxyport;
  50 char *proxyuser;
  51 char *proxypass;
  52 proxytype_t proxytype;
  53 int autoconnect;
  54
  55 char *scriptinterpreter;
  56 char *scriptextension;
  57
  58 bool node_read_ecdsa_public_key(node_t *n) {
  59         if(ecdsa_active(&n->ecdsa))
  60                 return true;
  61
  62         splay_tree_t *config_tree;
  63         FILE *fp;
  64         char *pubname = NULL, *hcfname = NULL;
  65         char *p;
  66         bool result = false;
  67
  68         xasprintf(&hcfname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  69
  70         init_configuration(&config_tree);
  71         if(!read_config_file(config_tree, hcfname))
  72                 goto exit;
  73
  74         /* First, check for simple ECDSAPublicKey statement */
  75
  76         if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
  77                 result = ecdsa_set_base64_public_key(&n->ecdsa, p);
  78                 free(p);
  79                 goto exit;
  80         }
  81
  82         /* Else, check for ECDSAPublicKeyFile statement and read it */
  83
  84         if(!get_config_string(lookup_config(config_tree, "ECDSAPublicKeyFile"), &pubname))
  85                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  86
  87         fp = fopen(pubname, "r");
  88
  89         if(!fp) {
  90                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s", pubname, strerror(errno));
  91                 goto exit;
  92         }
  93
  94         result = ecdsa_read_pem_public_key(&n->ecdsa, fp);
  95         fclose(fp);
  96
  97 exit:
  98         exit_configuration(&config_tree);
  99         free(hcfname);
 100         free(pubname);
 101         return result;
 102 }
 103
 104 bool read_ecdsa_public_key(connection_t *c) {
 105         FILE *fp;
 106         char *fname;
 107         char *p;
 108         bool result;
 109
 110         /* First, check for simple ECDSAPublicKey statement */
 111
 112         if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
 113                 result = ecdsa_set_base64_public_key(&c->ecdsa, p);
 114                 free(p);
 115                 return result;
 116         }
 117
 118         /* Else, check for ECDSAPublicKeyFile statement and read it */
 119
 120         if(!get_config_string(lookup_config(c->config_tree, "ECDSAPublicKeyFile"), &fname))
 121                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 122
 123         fp = fopen(fname, "r");
 124
 125         if(!fp) {
 126                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s",
 127                            fname, strerror(errno));
 128                 free(fname);
 129                 return false;
 130         }
 131
 132         result = ecdsa_read_pem_public_key(&c->ecdsa, fp);
 133         fclose(fp);
 134
 135         if(!result)
 136                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing ECDSA public key file `%s' failed.", fname);
 137         free(fname);
 138         return result;
 139 }
 140
 141 bool read_rsa_public_key(connection_t *c) {
 142         FILE *fp;
 143         char *fname;
 144         char *n;
 145         bool result;
 146
 147         /* First, check for simple PublicKey statement */
 148
 149         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 150                 result = rsa_set_hex_public_key(&c->rsa, n, "FFFF");
 151                 free(n);
 152                 return result;
 153         }
 154
 155         /* Else, check for PublicKeyFile statement and read it */
 156
 157         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 158                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 159
 160         fp = fopen(fname, "r");
 161
 162         if(!fp) {
 163                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 164                 free(fname);
 165                 return false;
 166         }
 167
 168         result = rsa_read_pem_public_key(&c->rsa, fp);
 169         fclose(fp);
 170
 171         if(!result)
 172                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 173         free(fname);
 174         return result;
 175 }
 176
 177 static bool read_ecdsa_private_key(void) {
 178         FILE *fp;
 179         char *fname;
 180         bool result;
 181
 182         /* Check for PrivateKeyFile statement and read it */
 183
 184         if(!get_config_string(lookup_config(config_tree, "ECDSAPrivateKeyFile"), &fname))
 185                 xasprintf(&fname, "%s" SLASH "ecdsa_key.priv", confbase);
 186
 187         fp = fopen(fname, "r");
 188
 189         if(!fp) {
 190                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA private key file `%s': %s", fname, strerror(errno));
 191                 free(fname);
 192                 return false;
 193         }
 194
 195 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 196         struct stat s;
 197
 198         if(fstat(fileno(fp), &s)) {
 199                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat ECDSA private key file `%s': %s'", fname, strerror(errno));
 200                 free(fname);
 201                 return false;
 202         }
 203
 204         if(s.st_mode & ~0100700)
 205                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for ECDSA private key file `%s'!", fname);
 206 #endif
 207
 208         result = ecdsa_read_pem_private_key(&myself->connection->ecdsa, fp);
 209         fclose(fp);
 210
 211         if(!result)
 212                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 213         free(fname);
 214         return result;
 215 }
 216
 217 static bool read_rsa_private_key(void) {
 218         FILE *fp;
 219         char *fname;
 220         char *n, *d;
 221         bool result;
 222
 223         /* First, check for simple PrivateKey statement */
 224
 225         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 226                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 227                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 228                         free(d);
 229                         return false;
 230                 }
 231                 result = rsa_set_hex_private_key(&myself->connection->rsa, n, "FFFF", d);
 232                 free(n);
 233                 free(d);
 234                 return result;
 235         }
 236
 237         /* Else, check for PrivateKeyFile statement and read it */
 238
 239         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 240                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 241
 242         fp = fopen(fname, "r");
 243
 244         if(!fp) {
 245                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 246                            fname, strerror(errno));
 247                 free(fname);
 248                 return false;
 249         }
 250
 251 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 252         struct stat s;
 253
 254         if(fstat(fileno(fp), &s)) {
 255                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 256                 free(fname);
 257                 return false;
 258         }
 259
 260         if(s.st_mode & ~0100700)
 261                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 262 #endif
 263
 264         result = rsa_read_pem_private_key(&myself->connection->rsa, fp);
 265         fclose(fp);
 266
 267         if(!result)
 268                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 269         free(fname);
 270         return result;
 271 }
 272
 273 static struct event keyexpire_event;
 274
 275 static void keyexpire_handler(int fd, short events, void *data) {
 276         regenerate_key();
 277 }
 278
 279 void regenerate_key(void) {
 280         if(timeout_initialized(&keyexpire_event)) {
 281                 logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 282                 event_del(&keyexpire_event);
 283                 send_key_changed();
 284         } else {
 285                 timeout_set(&keyexpire_event, keyexpire_handler, NULL);
 286         }
 287
 288         event_add(&keyexpire_event, &(struct timeval){keylifetime, rand() % 100000});
 289 }
 290
 291 /*
 292   Read Subnets from all host config files
 293 */
 294 void load_all_subnets(void) {
 295         DIR *dir;
 296         struct dirent *ent;
 297         char *dname;
 298
 299         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 300         dir = opendir(dname);
 301         if(!dir) {
 302                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 303                 free(dname);
 304                 return;
 305         }
 306
 307         while((ent = readdir(dir))) {
 308                 if(!check_id(ent->d_name))
 309                         continue;
 310
 311                 node_t *n = lookup_node(ent->d_name);
 312                 #ifdef _DIRENT_HAVE_D_TYPE
 313                 //if(ent->d_type != DT_REG)
 314                 //      continue;
 315                 #endif
 316
 317                 char *fname;
 318                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, ent->d_name);
 319
 320                 splay_tree_t *config_tree;
 321                 init_configuration(&config_tree);
 322                 read_config_options(config_tree, ent->d_name);
 323                 read_config_file(config_tree, fname);
 324                 free(fname);
 325
 326                 if(!n) {
 327                         n = new_node();
 328                         n->name = xstrdup(ent->d_name);
 329                         node_add(n);
 330                 }
 331
 332                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 333                         subnet_t *s, *s2;
 334
 335                         if(!get_config_subnet(cfg, &s))
 336                                 continue;
 337
 338                         if((s2 = lookup_subnet(n, s))) {
 339                                 s2->expires = -1;
 340                         } else {
 341                                 subnet_add(n, s);
 342                         }
 343                 }
 344
 345                 exit_configuration(&config_tree);
 346         }
 347
 348         closedir(dir);
 349 }
 350
 351 void load_all_nodes(void) {
 352         DIR *dir;
 353         struct dirent *ent;
 354         char *dname;
 355
 356         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 357         dir = opendir(dname);
 358         if(!dir) {
 359                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 360                 free(dname);
 361                 return;
 362         }
 363
 364         while((ent = readdir(dir))) {
 365                 if(!check_id(ent->d_name))
 366                         continue;
 367
 368                 node_t *n = lookup_node(ent->d_name);
 369                 if(n)
 370                         continue;
 371
 372                 n = new_node();
 373                 n->name = xstrdup(ent->d_name);
 374                 node_add(n);
 375         }
 376
 377         closedir(dir);
 378 }
 379
 380
 381 char *get_name(void) {
 382         char *name = NULL;
 383
 384         get_config_string(lookup_config(config_tree, "Name"), &name);
 385
 386         if(!name)
 387                 return NULL;
 388
 389         if(*name == '$') {
 390                 char *envname = getenv(name + 1);
 391                 if(!envname) {
 392                         if(strcmp(name + 1, "HOST")) {
 393                                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1);
 394                                 return false;
 395                         }
 396                         char envname[32];
 397                         if(gethostname(envname, 32)) {
 398                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", strerror(errno));
 399                                 return false;
 400                         }
 401                         envname[31] = 0;
 402                 }
 403                 free(name);
 404                 name = xstrdup(envname);
 405                 for(char *c = name; *c; c++)
 406                         if(!isalnum(*c))
 407                                 *c = '_';
 408         }
 409
 410         if(!check_id(name)) {
 411                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
 412                 free(name);
 413                 return false;
 414         }
 415
 416         return name;
 417 }
 418
 419 bool setup_myself_reloadable(void) {
 420         char *proxy = NULL;
 421         char *rmode = NULL;
 422         char *fmode = NULL;
 423         char *bmode = NULL;
 424         char *afname = NULL;
 425         char *space;
 426         bool choice;
 427
 428         free(scriptinterpreter);
 429         scriptinterpreter = NULL;
 430         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 431
 432
 433         free(scriptextension);
 434         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 435 #ifdef HAVE_MINGW
 436                 scriptextension = xstrdup(".bat");
 437 #else
 438                 scriptextension = xstrdup("");
 439 #endif
 440
 441         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 442         if(proxy) {
 443                 if((space = strchr(proxy, ' ')))
 444                         *space++ = 0;
 445
 446                 if(!strcasecmp(proxy, "none")) {
 447                         proxytype = PROXY_NONE;
 448                 } else if(!strcasecmp(proxy, "socks4")) {
 449                         proxytype = PROXY_SOCKS4;
 450                 } else if(!strcasecmp(proxy, "socks4a")) {
 451                         proxytype = PROXY_SOCKS4A;
 452                 } else if(!strcasecmp(proxy, "socks5")) {
 453                         proxytype = PROXY_SOCKS5;
 454                 } else if(!strcasecmp(proxy, "http")) {
 455                         proxytype = PROXY_HTTP;
 456                 } else if(!strcasecmp(proxy, "exec")) {
 457                         proxytype = PROXY_EXEC;
 458                 } else {
 459                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 460                         return false;
 461                 }
 462
 463                 switch(proxytype) {
 464                         case PROXY_NONE:
 465                         default:
 466                                 break;
 467
 468                         case PROXY_EXEC:
 469                                 if(!space || !*space) {
 470                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 471                                         return false;
 472                                 }
 473                                 proxyhost =  xstrdup(space);
 474                                 break;
 475
 476                         case PROXY_SOCKS4:
 477                         case PROXY_SOCKS4A:
 478                         case PROXY_SOCKS5:
 479                         case PROXY_HTTP:
 480                                 proxyhost = space;
 481                                 if(space && (space = strchr(space, ' ')))
 482                                         *space++ = 0, proxyport = space;
 483                                 if(space && (space = strchr(space, ' ')))
 484                                         *space++ = 0, proxyuser = space;
 485                                 if(space && (space = strchr(space, ' ')))
 486                                         *space++ = 0, proxypass = space;
 487                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 488                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 489                                         return false;
 490                                 }
 491                                 proxyhost = xstrdup(proxyhost);
 492                                 proxyport = xstrdup(proxyport);
 493                                 if(proxyuser && *proxyuser)
 494                                         proxyuser = xstrdup(proxyuser);
 495                                 if(proxypass && *proxypass)
 496                                         proxypass = xstrdup(proxypass);
 497                                 break;
 498                 }
 499
 500                 free(proxy);
 501         }
 502
 503         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 504                 myself->options |= OPTION_INDIRECT;
 505
 506         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 507                 myself->options |= OPTION_TCPONLY;
 508
 509         if(myself->options & OPTION_TCPONLY)
 510                 myself->options |= OPTION_INDIRECT;
 511
 512         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 513         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 514
 515         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 516                 if(!strcasecmp(rmode, "router"))
 517                         routing_mode = RMODE_ROUTER;
 518                 else if(!strcasecmp(rmode, "switch"))
 519                         routing_mode = RMODE_SWITCH;
 520                 else if(!strcasecmp(rmode, "hub"))
 521                         routing_mode = RMODE_HUB;
 522                 else {
 523                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 524                         return false;
 525                 }
 526                 free(rmode);
 527         }
 528
 529         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 530                 if(!strcasecmp(fmode, "off"))
 531                         forwarding_mode = FMODE_OFF;
 532                 else if(!strcasecmp(fmode, "internal"))
 533                         forwarding_mode = FMODE_INTERNAL;
 534                 else if(!strcasecmp(fmode, "kernel"))
 535                         forwarding_mode = FMODE_KERNEL;
 536                 else {
 537                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 538                         return false;
 539                 }
 540                 free(fmode);
 541         }
 542
 543         choice = true;
 544         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 545         if(choice)
 546                 myself->options |= OPTION_PMTU_DISCOVERY;
 547
 548         choice = true;
 549         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 550         if(choice)
 551                 myself->options |= OPTION_CLAMP_MSS;
 552
 553         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 554         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 555         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 556                 if(!strcasecmp(bmode, "no"))
 557                         broadcast_mode = BMODE_NONE;
 558                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 559                         broadcast_mode = BMODE_MST;
 560                 else if(!strcasecmp(bmode, "direct"))
 561                         broadcast_mode = BMODE_DIRECT;
 562                 else {
 563                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 564                         return false;
 565                 }
 566                 free(bmode);
 567         }
 568
 569 #if !defined(SOL_IP) || !defined(IP_TOS)
 570         if(priorityinheritance)
 571                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 572 #endif
 573
 574         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 575                 macexpire = 600;
 576
 577         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 578                 if(maxtimeout <= 0) {
 579                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 580                         return false;
 581                 }
 582         } else
 583                 maxtimeout = 900;
 584
 585         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 586                 if(!strcasecmp(afname, "IPv4"))
 587                         addressfamily = AF_INET;
 588                 else if(!strcasecmp(afname, "IPv6"))
 589                         addressfamily = AF_INET6;
 590                 else if(!strcasecmp(afname, "any"))
 591                         addressfamily = AF_UNSPEC;
 592                 else {
 593                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 594                         return false;
 595                 }
 596                 free(afname);
 597         }
 598
 599         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 600
 601         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 602                 keylifetime = 3600;
 603
 604         get_config_int(lookup_config(config_tree, "AutoConnect"), &autoconnect);
 605
 606         return true;
 607 }
 608
 609 /*
 610   Configure node_t myself and set up the local sockets (listen only)
 611 */
 612 static bool setup_myself(void) {
 613         char *name, *hostname, *cipher, *digest, *type;
 614         char *fname = NULL;
 615         char *address = NULL;
 616
 617         if(!(name = get_name())) {
 618                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 619                 return false;
 620         }
 621
 622         myself = new_node();
 623         myself->connection = new_connection();
 624         myself->name = name;
 625         myself->connection->name = xstrdup(name);
 626         xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 627         read_config_options(config_tree, name);
 628         read_config_file(config_tree, fname);
 629         free(fname);
 630
 631         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 632                 myport = xstrdup("655");
 633
 634         xasprintf(&myself->hostname, "MYSELF port %s", myport);
 635         myself->connection->hostname = xstrdup(myself->hostname);
 636
 637         myself->connection->options = 0;
 638         myself->connection->protocol_major = PROT_MAJOR;
 639         myself->connection->protocol_minor = PROT_MINOR;
 640
 641         myself->options |= PROT_MINOR << 24;
 642
 643         get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental);
 644
 645         if(experimental && !read_ecdsa_private_key())
 646                 return false;
 647
 648         if(!read_rsa_private_key())
 649                 return false;
 650
 651         if(!atoi(myport)) {
 652                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 653                 sockaddr_t sa;
 654                 if(!ai || !ai->ai_addr)
 655                         return false;
 656                 free(myport);
 657                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 658                 sockaddr2str(&sa, NULL, &myport);
 659         }
 660
 661         /* Read in all the subnets specified in the host configuration file */
 662
 663         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 664                 subnet_t *subnet;
 665
 666                 if(!get_config_subnet(cfg, &subnet))
 667                         return false;
 668
 669                 subnet_add(myself, subnet);
 670         }
 671
 672         /* Check some options */
 673
 674         if(!setup_myself_reloadable())
 675                 return false;
 676
 677         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 678         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 679         strictsubnets |= tunnelserver;
 680
 681
 682
 683         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 684                 if(udp_rcvbuf <= 0) {
 685                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 686                         return false;
 687                 }
 688         }
 689
 690         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 691                 if(udp_sndbuf <= 0) {
 692                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 693                         return false;
 694                 }
 695         }
 696
 697         int replaywin_int;
 698         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 699                 if(replaywin_int < 0) {
 700                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 701                         return false;
 702                 }
 703                 replaywin = (unsigned)replaywin_int;
 704                 sptps_replaywin = replaywin;
 705         }
 706
 707         /* Generate packet encryption key */
 708
 709         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 710                 cipher = xstrdup("blowfish");
 711
 712         if(!cipher_open_by_name(&myself->incipher, cipher)) {
 713                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 714                 return false;
 715         }
 716
 717         free(cipher);
 718
 719         regenerate_key();
 720
 721         /* Check if we want to use message authentication codes... */
 722
 723         int maclength = 4;
 724         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 725
 726         if(maclength < 0) {
 727                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 728                 return false;
 729         }
 730
 731         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 732                 digest = xstrdup("sha1");
 733
 734         if(!digest_open_by_name(&myself->indigest, digest, maclength)) {
 735                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 736                 return false;
 737         }
 738
 739         free(digest);
 740
 741         /* Compression */
 742
 743         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 744                 if(myself->incompression < 0 || myself->incompression > 11) {
 745                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 746                         return false;
 747                 }
 748         } else
 749                 myself->incompression = 0;
 750
 751         myself->connection->outcompression = 0;
 752
 753         /* Done */
 754
 755         myself->nexthop = myself;
 756         myself->via = myself;
 757         myself->status.reachable = true;
 758         myself->last_state_change = time(NULL);
 759         myself->status.sptps = experimental;
 760         node_add(myself);
 761
 762         graph();
 763
 764         if(strictsubnets)
 765                 load_all_subnets();
 766         else if(autoconnect)
 767                 load_all_nodes();
 768
 769         /* Open device */
 770
 771         devops = os_devops;
 772
 773         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 774                 if(!strcasecmp(type, "dummy"))
 775                         devops = dummy_devops;
 776                 else if(!strcasecmp(type, "raw_socket"))
 777                         devops = raw_socket_devops;
 778                 else if(!strcasecmp(type, "multicast"))
 779                         devops = multicast_devops;
 780 #ifdef ENABLE_UML
 781                 else if(!strcasecmp(type, "uml"))
 782                         devops = uml_devops;
 783 #endif
 784 #ifdef ENABLE_VDE
 785                 else if(!strcasecmp(type, "vde"))
 786                         devops = vde_devops;
 787 #endif
 788         }
 789
 790         if(!devops.setup())
 791                 return false;
 792
 793         if(device_fd >= 0) {
 794                 event_set(&device_ev, device_fd, EV_READ|EV_PERSIST, handle_device_data, NULL);
 795
 796                 if (event_add(&device_ev, NULL) < 0) {
 797                         logger(DEBUG_ALWAYS, LOG_ERR, "event_add failed: %s", strerror(errno));
 798                         devops.close();
 799                         return false;
 800                 }
 801         }
 802
 803         /* Run tinc-up script to further initialize the tap interface */
 804         char *envp[5];
 805         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 806         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 807         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 808         xasprintf(&envp[3], "NAME=%s", myself->name);
 809         envp[4] = NULL;
 810
 811         execute_script("tinc-up", envp);
 812
 813         for(int i = 0; i < 4; i++)
 814                 free(envp[i]);
 815
 816         /* Run subnet-up scripts for our own subnets */
 817
 818         subnet_update(myself, NULL, true);
 819
 820         /* Open sockets */
 821
 822         if(!do_detach && getenv("LISTEN_FDS")) {
 823                 sockaddr_t sa;
 824                 socklen_t salen;
 825
 826                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 827 #ifdef HAVE_UNSETENV
 828                 unsetenv("LISTEN_FDS");
 829 #endif
 830
 831                 if(listen_sockets > MAXSOCKETS) {
 832                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 833                         return false;
 834                 }
 835
 836                 for(int i = 0; i < listen_sockets; i++) {
 837                         salen = sizeof sa;
 838                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 839                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
 840                                 return false;
 841                         }
 842
 843                         listen_socket[i].tcp = i + 3;
 844
 845 #ifdef FD_CLOEXEC
 846                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 847 #endif
 848
 849                         listen_socket[i].udp = setup_vpn_in_socket(&sa);
 850                         if(listen_socket[i].udp < 0)
 851                                 return false;
 852
 853                         event_set(&listen_socket[i].ev_tcp, listen_socket[i].tcp, EV_READ|EV_PERSIST, handle_new_meta_connection, NULL);
 854                         if(event_add(&listen_socket[i].ev_tcp, NULL) < 0) {
 855                                 logger(DEBUG_ALWAYS, LOG_ERR, "event_add failed: %s", strerror(errno));
 856                                 abort();
 857                         }
 858
 859                         event_set(&listen_socket[i].ev_udp, listen_socket[i].udp, EV_READ|EV_PERSIST, handle_incoming_vpn_data, (void *)(intptr_t)listen_sockets);
 860                         if(event_add(&listen_socket[listen_sockets].ev_udp, NULL) < 0) {
 861                                 logger(DEBUG_ALWAYS, LOG_ERR, "event_add failed: %s", strerror(errno));
 862                                 abort();
 863                         }
 864
 865                         if(debug_level >= DEBUG_CONNECTIONS) {
 866                                 hostname = sockaddr2hostname(&sa);
 867                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 868                                 free(hostname);
 869                         }
 870
 871                         memcpy(&listen_socket[i].sa, &sa, salen);
 872                 }
 873         } else {
 874                 listen_sockets = 0;
 875                 config_t *cfg = lookup_config(config_tree, "BindToAddress");
 876
 877                 do {
 878                         get_config_string(cfg, &address);
 879                         if(cfg)
 880                                 cfg = lookup_config_next(config_tree, cfg);
 881
 882                         char *port = myport;
 883
 884                         if(address) {
 885                                 char *space = strchr(address, ' ');
 886                                 if(space) {
 887                                         *space++ = 0;
 888                                         port = space;
 889                                 }
 890
 891                                 if(!strcmp(address, "*"))
 892                                         *address = 0;
 893                         }
 894
 895                         struct addrinfo *ai, hint = {0};
 896                         hint.ai_family = addressfamily;
 897                         hint.ai_socktype = SOCK_STREAM;
 898                         hint.ai_protocol = IPPROTO_TCP;
 899                         hint.ai_flags = AI_PASSIVE;
 900
 901                         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 902                         free(address);
 903
 904                         if(err || !ai) {
 905                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
 906                                            gai_strerror(err));
 907                                 return false;
 908                         }
 909
 910                         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 911                                 if(listen_sockets >= MAXSOCKETS) {
 912                                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 913                                         return false;
 914                                 }
 915
 916                                 listen_socket[listen_sockets].tcp =
 917                                         setup_listen_socket((sockaddr_t *) aip->ai_addr);
 918
 919                                 if(listen_socket[listen_sockets].tcp < 0)
 920                                         continue;
 921
 922                                 listen_socket[listen_sockets].udp =
 923                                         setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 924
 925                                 if(listen_socket[listen_sockets].udp < 0) {
 926                                         close(listen_socket[listen_sockets].tcp);
 927                                         continue;
 928                                 }
 929
 930                                 event_set(&listen_socket[listen_sockets].ev_tcp,
 931                                                   listen_socket[listen_sockets].tcp,
 932                                                   EV_READ|EV_PERSIST,
 933                                                   handle_new_meta_connection, NULL);
 934                                 if(event_add(&listen_socket[listen_sockets].ev_tcp, NULL) < 0) {
 935                                         logger(DEBUG_ALWAYS, LOG_ERR, "event_add failed: %s", strerror(errno));
 936                                         abort();
 937                                 }
 938
 939                                 event_set(&listen_socket[listen_sockets].ev_udp,
 940                                                   listen_socket[listen_sockets].udp,
 941                                                   EV_READ|EV_PERSIST,
 942                                                   handle_incoming_vpn_data, (void *)(intptr_t)listen_sockets);
 943                                 if(event_add(&listen_socket[listen_sockets].ev_udp, NULL) < 0) {
 944                                         logger(DEBUG_ALWAYS, LOG_ERR, "event_add failed: %s", strerror(errno));
 945                                         abort();
 946                                 }
 947
 948                                 if(debug_level >= DEBUG_CONNECTIONS) {
 949                                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 950                                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 951                                         free(hostname);
 952                                 }
 953
 954                                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 955                                 listen_sockets++;
 956                         }
 957
 958                         freeaddrinfo(ai);
 959                 } while(cfg);
 960         }
 961
 962         if(listen_sockets)
 963                 logger(DEBUG_ALWAYS, LOG_NOTICE, "Ready");
 964         else {
 965                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
 966                 return false;
 967         }
 968
 969         last_config_check = time(NULL);
 970
 971         return true;
 972 }
 973
 974 /*
 975   initialize network
 976 */
 977 bool setup_network(void) {
 978         init_connections();
 979         init_subnets();
 980         init_nodes();
 981         init_edges();
 982         init_requests();
 983
 984         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 985                 if(pinginterval < 1) {
 986                         pinginterval = 86400;
 987                 }
 988         } else
 989                 pinginterval = 60;
 990
 991         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 992                 pingtimeout = 5;
 993         if(pingtimeout < 1 || pingtimeout > pinginterval)
 994                 pingtimeout = pinginterval;
 995
 996         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 997                 maxoutbufsize = 10 * MTU;
 998
 999         if(!setup_myself())
1000                 return false;
1001
1002         return true;
1003 }
1004
1005 /*
1006   close all open network connections
1007 */
1008 void close_network_connections(void) {
1009         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1010                 next = node->next;
1011                 connection_t *c = node->data;
1012                 /* Keep control connections open until the end, so they know when we really terminated */
1013                 if(c->status.control)
1014                         c->socket = -1;
1015                 c->outgoing = NULL;
1016                 terminate_connection(c, false);
1017         }
1018
1019         list_delete_list(outgoing_list);
1020
1021         if(myself && myself->connection) {
1022                 subnet_update(myself, NULL, false);
1023                 terminate_connection(myself->connection, false);
1024                 free_connection(myself->connection);
1025         }
1026
1027         for(int i = 0; i < listen_sockets; i++) {
1028                 event_del(&listen_socket[i].ev_tcp);
1029                 event_del(&listen_socket[i].ev_udp);
1030                 close(listen_socket[i].tcp);
1031                 close(listen_socket[i].udp);
1032         }
1033
1034         char *envp[5];
1035         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
1036         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
1037         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
1038         xasprintf(&envp[3], "NAME=%s", myself->name);
1039         envp[4] = NULL;
1040
1041         exit_requests();
1042         exit_edges();
1043         exit_subnets();
1044         exit_nodes();
1045         exit_connections();
1046
1047         execute_script("tinc-down", envp);
1048
1049         if(myport) free(myport);
1050
1051         for(int i = 0; i < 4; i++)
1052                 free(envp[i]);
1053
1054         devops.close();
1055
1056         return;
1057 }