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