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 "splay_tree.h"
  26 #include "cipher.h"
  27 #include "conf.h"
  28 #include "connection.h"
  29 #include "control.h"
  30 #include "device.h"
  31 #include "digest.h"
  32 #include "ecdsa.h"
  33 #include "graph.h"
  34 #include "logger.h"
  35 #include "net.h"
  36 #include "netutl.h"
  37 #include "process.h"
  38 #include "protocol.h"
  39 #include "route.h"
  40 #include "rsa.h"
  41 #include "subnet.h"
  42 #include "utils.h"
  43 #include "xalloc.h"
  44
  45 char *myport;
  46 static struct event device_ev;
  47 devops_t devops;
  48
  49 char *proxyhost;
  50 char *proxyport;
  51 char *proxyuser;
  52 char *proxypass;
  53 proxytype_t proxytype;
  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, 0});
 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         char *fname;
 299         splay_tree_t *config_tree;
 300         config_t *cfg;
 301         subnet_t *s, *s2;
 302         node_t *n;
 303
 304         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 305         dir = opendir(dname);
 306         if(!dir) {
 307                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 308                 free(dname);
 309                 return;
 310         }
 311
 312         while((ent = readdir(dir))) {
 313                 if(!check_id(ent->d_name))
 314                         continue;
 315
 316                 n = lookup_node(ent->d_name);
 317                 #ifdef _DIRENT_HAVE_D_TYPE
 318                 //if(ent->d_type != DT_REG)
 319                 //      continue;
 320                 #endif
 321
 322                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, ent->d_name);
 323                 init_configuration(&config_tree);
 324                 read_config_options(config_tree, ent->d_name);
 325                 read_config_file(config_tree, fname);
 326                 free(fname);
 327
 328                 if(!n) {
 329                         n = new_node();
 330                         n->name = xstrdup(ent->d_name);
 331                         node_add(n);
 332                 }
 333
 334                 for(cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 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 char *get_name(void) {
 352         char *name = NULL;
 353
 354         get_config_string(lookup_config(config_tree, "Name"), &name);
 355
 356         if(!name)
 357                 return NULL;
 358
 359         if(*name == '$') {
 360                 char *envname = getenv(name + 1);
 361                 if(!envname) {
 362                         if(strcmp(name + 1, "HOST")) {
 363                                 fprintf(stderr, "Invalid Name: environment variable %s does not exist\n", name + 1);
 364                                 return false;
 365                         }
 366                         envname = alloca(32);
 367                         if(gethostname(envname, 32)) {
 368                                 fprintf(stderr, "Could not get hostname: %s\n", strerror(errno));
 369                                 return false;
 370                         }
 371                         envname[31] = 0;
 372                 }
 373                 free(name);
 374                 name = xstrdup(envname);
 375                 for(char *c = name; *c; c++)
 376                         if(!isalnum(*c))
 377                                 *c = '_';
 378         }
 379
 380         if(!check_id(name)) {
 381                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
 382                 free(name);
 383                 return false;
 384         }
 385
 386         return name;
 387 }
 388
 389 bool setup_myself_reloadable(void) {
 390         char *proxy = NULL;
 391         char *rmode = NULL;
 392         char *fmode = NULL;
 393         char *bmode = NULL;
 394         char *afname = NULL;
 395         char *space;
 396         bool choice;
 397
 398         free(scriptinterpreter);
 399         scriptinterpreter = NULL;
 400         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 401
 402
 403         free(scriptextension);
 404         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 405 #ifdef HAVE_MINGW
 406                 scriptextension = xstrdup(".bat");
 407 #else
 408                 scriptextension = xstrdup("");
 409 #endif
 410
 411         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 412         if(proxy) {
 413                 if((space = strchr(proxy, ' ')))
 414                         *space++ = 0;
 415
 416                 if(!strcasecmp(proxy, "none")) {
 417                         proxytype = PROXY_NONE;
 418                 } else if(!strcasecmp(proxy, "socks4")) {
 419                         proxytype = PROXY_SOCKS4;
 420                 } else if(!strcasecmp(proxy, "socks4a")) {
 421                         proxytype = PROXY_SOCKS4A;
 422                 } else if(!strcasecmp(proxy, "socks5")) {
 423                         proxytype = PROXY_SOCKS5;
 424                 } else if(!strcasecmp(proxy, "http")) {
 425                         proxytype = PROXY_HTTP;
 426                 } else if(!strcasecmp(proxy, "exec")) {
 427                         proxytype = PROXY_EXEC;
 428                 } else {
 429                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 430                         return false;
 431                 }
 432
 433                 switch(proxytype) {
 434                         case PROXY_NONE:
 435                         default:
 436                                 break;
 437
 438                         case PROXY_EXEC:
 439                                 if(!space || !*space) {
 440                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 441                                         return false;
 442                                 }
 443                                 proxyhost =  xstrdup(space);
 444                                 break;
 445
 446                         case PROXY_SOCKS4:
 447                         case PROXY_SOCKS4A:
 448                         case PROXY_SOCKS5:
 449                         case PROXY_HTTP:
 450                                 proxyhost = space;
 451                                 if(space && (space = strchr(space, ' ')))
 452                                         *space++ = 0, proxyport = space;
 453                                 if(space && (space = strchr(space, ' ')))
 454                                         *space++ = 0, proxyuser = space;
 455                                 if(space && (space = strchr(space, ' ')))
 456                                         *space++ = 0, proxypass = space;
 457                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 458                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 459                                         return false;
 460                                 }
 461                                 proxyhost = xstrdup(proxyhost);
 462                                 proxyport = xstrdup(proxyport);
 463                                 if(proxyuser && *proxyuser)
 464                                         proxyuser = xstrdup(proxyuser);
 465                                 if(proxypass && *proxypass)
 466                                         proxypass = xstrdup(proxypass);
 467                                 break;
 468                 }
 469
 470                 free(proxy);
 471         }
 472
 473         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 474                 myself->options |= OPTION_INDIRECT;
 475
 476         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 477                 myself->options |= OPTION_TCPONLY;
 478
 479         if(myself->options & OPTION_TCPONLY)
 480                 myself->options |= OPTION_INDIRECT;
 481
 482         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 483         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 484
 485         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 486                 if(!strcasecmp(rmode, "router"))
 487                         routing_mode = RMODE_ROUTER;
 488                 else if(!strcasecmp(rmode, "switch"))
 489                         routing_mode = RMODE_SWITCH;
 490                 else if(!strcasecmp(rmode, "hub"))
 491                         routing_mode = RMODE_HUB;
 492                 else {
 493                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 494                         return false;
 495                 }
 496                 free(rmode);
 497         }
 498
 499         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 500                 if(!strcasecmp(fmode, "off"))
 501                         forwarding_mode = FMODE_OFF;
 502                 else if(!strcasecmp(fmode, "internal"))
 503                         forwarding_mode = FMODE_INTERNAL;
 504                 else if(!strcasecmp(fmode, "kernel"))
 505                         forwarding_mode = FMODE_KERNEL;
 506                 else {
 507                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 508                         return false;
 509                 }
 510                 free(fmode);
 511         }
 512
 513         choice = true;
 514         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 515         if(choice)
 516                 myself->options |= OPTION_PMTU_DISCOVERY;
 517
 518         choice = true;
 519         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 520         if(choice)
 521                 myself->options |= OPTION_CLAMP_MSS;
 522
 523         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 524         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 525         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 526                 if(!strcasecmp(bmode, "no"))
 527                         broadcast_mode = BMODE_NONE;
 528                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 529                         broadcast_mode = BMODE_MST;
 530                 else if(!strcasecmp(bmode, "direct"))
 531                         broadcast_mode = BMODE_DIRECT;
 532                 else {
 533                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 534                         return false;
 535                 }
 536                 free(bmode);
 537         }
 538
 539 #if !defined(SOL_IP) || !defined(IP_TOS)
 540         if(priorityinheritance)
 541                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 542 #endif
 543
 544         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 545                 macexpire = 600;
 546
 547         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 548                 if(maxtimeout <= 0) {
 549                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 550                         return false;
 551                 }
 552         } else
 553                 maxtimeout = 900;
 554
 555         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 556                 if(!strcasecmp(afname, "IPv4"))
 557                         addressfamily = AF_INET;
 558                 else if(!strcasecmp(afname, "IPv6"))
 559                         addressfamily = AF_INET6;
 560                 else if(!strcasecmp(afname, "any"))
 561                         addressfamily = AF_UNSPEC;
 562                 else {
 563                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 564                         return false;
 565                 }
 566                 free(afname);
 567         }
 568
 569         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 570
 571         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 572                 keylifetime = 3600;
 573
 574         return true;
 575 }
 576
 577 /*
 578   Configure node_t myself and set up the local sockets (listen only)
 579 */
 580 static bool setup_myself(void) {
 581         config_t *cfg;
 582         subnet_t *subnet;
 583         char *name, *hostname, *cipher, *digest, *type;
 584         char *fname = NULL;
 585         char *address = NULL;
 586         char *envp[5];
 587         struct addrinfo *ai, *aip, hint = {0};
 588         int i, err;
 589         int replaywin_int;
 590
 591         if(!(name = get_name())) {
 592                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 593                 return false;
 594         }
 595
 596         myself = new_node();
 597         myself->connection = new_connection();
 598         myself->name = name;
 599         myself->connection->name = xstrdup(name);
 600         xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 601         read_config_options(config_tree, name);
 602         read_config_file(config_tree, fname);
 603         free(fname);
 604
 605         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 606                 myport = xstrdup("655");
 607
 608         xasprintf(&myself->hostname, "MYSELF port %s", myport);
 609         myself->connection->hostname = xstrdup(myself->hostname);
 610
 611         myself->connection->options = 0;
 612         myself->connection->protocol_major = PROT_MAJOR;
 613         myself->connection->protocol_minor = PROT_MINOR;
 614
 615         myself->options |= PROT_MINOR << 24;
 616
 617         get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental);
 618
 619         if(experimental && !read_ecdsa_private_key())
 620                 return false;
 621
 622         if(!read_rsa_private_key())
 623                 return false;
 624
 625         if(!atoi(myport)) {
 626                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 627                 sockaddr_t sa;
 628                 if(!ai || !ai->ai_addr)
 629                         return false;
 630                 free(myport);
 631                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 632                 sockaddr2str(&sa, NULL, &myport);
 633         }
 634
 635         /* Read in all the subnets specified in the host configuration file */
 636
 637         cfg = lookup_config(config_tree, "Subnet");
 638
 639         while(cfg) {
 640                 if(!get_config_subnet(cfg, &subnet))
 641                         return false;
 642
 643                 subnet_add(myself, subnet);
 644
 645                 cfg = lookup_config_next(config_tree, cfg);
 646         }
 647
 648         /* Check some options */
 649
 650         if(!setup_myself_reloadable())
 651                 return false;
 652
 653         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 654         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 655         strictsubnets |= tunnelserver;
 656
 657
 658
 659         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 660                 if(udp_rcvbuf <= 0) {
 661                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 662                         return false;
 663                 }
 664         }
 665
 666         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 667                 if(udp_sndbuf <= 0) {
 668                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 669                         return false;
 670                 }
 671         }
 672
 673         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 674                 if(replaywin_int < 0) {
 675                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 676                         return false;
 677                 }
 678                 replaywin = (unsigned)replaywin_int;
 679         }
 680
 681         /* Generate packet encryption key */
 682
 683         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 684                 cipher = xstrdup("blowfish");
 685
 686         if(!cipher_open_by_name(&myself->incipher, cipher)) {
 687                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 688                 return false;
 689         }
 690
 691         regenerate_key();
 692
 693         /* Check if we want to use message authentication codes... */
 694
 695         int maclength = 4;
 696         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 697
 698         if(maclength < 0) {
 699                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 700                 return false;
 701         }
 702
 703         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 704                 digest = xstrdup("sha1");
 705
 706         if(!digest_open_by_name(&myself->indigest, digest, maclength)) {
 707                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 708                 return false;
 709         }
 710
 711         /* Compression */
 712
 713         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 714                 if(myself->incompression < 0 || myself->incompression > 11) {
 715                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 716                         return false;
 717                 }
 718         } else
 719                 myself->incompression = 0;
 720
 721         myself->connection->outcompression = 0;
 722
 723         /* Done */
 724
 725         myself->nexthop = myself;
 726         myself->via = myself;
 727         myself->status.reachable = true;
 728         myself->last_state_change = time(NULL);
 729         myself->status.sptps = experimental;
 730         node_add(myself);
 731
 732         graph();
 733
 734         if(strictsubnets)
 735                 load_all_subnets();
 736
 737         /* Open device */
 738
 739         devops = os_devops;
 740
 741         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 742                 if(!strcasecmp(type, "dummy"))
 743                         devops = dummy_devops;
 744                 else if(!strcasecmp(type, "raw_socket"))
 745                         devops = raw_socket_devops;
 746                 else if(!strcasecmp(type, "multicast"))
 747                         devops = multicast_devops;
 748 #ifdef ENABLE_UML
 749                 else if(!strcasecmp(type, "uml"))
 750                         devops = uml_devops;
 751 #endif
 752 #ifdef ENABLE_VDE
 753                 else if(!strcasecmp(type, "vde"))
 754                         devops = vde_devops;
 755 #endif
 756         }
 757
 758         if(!devops.setup())
 759                 return false;
 760
 761         if(device_fd >= 0) {
 762                 event_set(&device_ev, device_fd, EV_READ|EV_PERSIST, handle_device_data, NULL);
 763
 764                 if (event_add(&device_ev, NULL) < 0) {
 765                         logger(DEBUG_ALWAYS, LOG_ERR, "event_add failed: %s", strerror(errno));
 766                         devops.close();
 767                         return false;
 768                 }
 769         }
 770
 771         /* Run tinc-up script to further initialize the tap interface */
 772         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 773         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 774         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 775         xasprintf(&envp[3], "NAME=%s", myself->name);
 776         envp[4] = NULL;
 777
 778         execute_script("tinc-up", envp);
 779
 780         for(i = 0; i < 4; i++)
 781                 free(envp[i]);
 782
 783         /* Run subnet-up scripts for our own subnets */
 784
 785         subnet_update(myself, NULL, true);
 786
 787         /* Open sockets */
 788
 789         if(!do_detach && getenv("LISTEN_FDS")) {
 790                 sockaddr_t sa;
 791                 socklen_t salen;
 792
 793                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 794 #ifdef HAVE_UNSETENV
 795                 unsetenv("LISTEN_FDS");
 796 #endif
 797
 798                 if(listen_sockets > MAXSOCKETS) {
 799                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 800                         return false;
 801                 }
 802
 803                 for(i = 0; i < listen_sockets; i++) {
 804                         salen = sizeof sa;
 805                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 806                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
 807                                 return false;
 808                         }
 809
 810                         listen_socket[i].tcp = i + 3;
 811
 812 #ifdef FD_CLOEXEC
 813                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 814 #endif
 815
 816                         listen_socket[i].udp = setup_vpn_in_socket(&sa);
 817                         if(listen_socket[i].udp < 0)
 818                                 return false;
 819
 820                         event_set(&listen_socket[i].ev_tcp, listen_socket[i].tcp, EV_READ|EV_PERSIST, handle_new_meta_connection, NULL);
 821                         if(event_add(&listen_socket[i].ev_tcp, NULL) < 0) {
 822                                 logger(DEBUG_ALWAYS, LOG_ERR, "event_add failed: %s", strerror(errno));
 823                                 abort();
 824                         }
 825
 826                         event_set(&listen_socket[i].ev_udp, listen_socket[i].udp, EV_READ|EV_PERSIST, handle_incoming_vpn_data, (void *)(intptr_t)listen_sockets);
 827                         if(event_add(&listen_socket[listen_sockets].ev_udp, NULL) < 0) {
 828                                 logger(DEBUG_ALWAYS, LOG_ERR, "event_add failed: %s", strerror(errno));
 829                                 abort();
 830                         }
 831
 832                         if(debug_level >= DEBUG_CONNECTIONS) {
 833                                 hostname = sockaddr2hostname(&sa);
 834                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 835                                 free(hostname);
 836                         }
 837
 838                         memcpy(&listen_socket[i].sa, &sa, salen);
 839                 }
 840         } else {
 841                 listen_sockets = 0;
 842                 cfg = lookup_config(config_tree, "BindToAddress");
 843
 844                 do {
 845                         get_config_string(cfg, &address);
 846                         if(cfg)
 847                                 cfg = lookup_config_next(config_tree, cfg);
 848
 849                         char *port = myport;
 850
 851                         if(address) {
 852                                 char *space = strchr(address, ' ');
 853                                 if(space) {
 854                                         *space++ = 0;
 855                                         port = space;
 856                                 }
 857
 858                                 if(!strcmp(address, "*"))
 859                                         *address = 0;
 860                         }
 861
 862                         hint.ai_family = addressfamily;
 863                         hint.ai_socktype = SOCK_STREAM;
 864                         hint.ai_protocol = IPPROTO_TCP;
 865                         hint.ai_flags = AI_PASSIVE;
 866
 867                         err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 868                         free(address);
 869
 870                         if(err || !ai) {
 871                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
 872                                            gai_strerror(err));
 873                                 return false;
 874                         }
 875
 876                         for(aip = ai; aip; aip = aip->ai_next) {
 877                                 if(listen_sockets >= MAXSOCKETS) {
 878                                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 879                                         return false;
 880                                 }
 881
 882                                 listen_socket[listen_sockets].tcp =
 883                                         setup_listen_socket((sockaddr_t *) aip->ai_addr);
 884
 885                                 if(listen_socket[listen_sockets].tcp < 0)
 886                                         continue;
 887
 888                                 listen_socket[listen_sockets].udp =
 889                                         setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 890
 891                                 if(listen_socket[listen_sockets].udp < 0) {
 892                                         close(listen_socket[listen_sockets].tcp);
 893                                         continue;
 894                                 }
 895
 896                                 event_set(&listen_socket[listen_sockets].ev_tcp,
 897                                                   listen_socket[listen_sockets].tcp,
 898                                                   EV_READ|EV_PERSIST,
 899                                                   handle_new_meta_connection, NULL);
 900                                 if(event_add(&listen_socket[listen_sockets].ev_tcp, NULL) < 0) {
 901                                         logger(DEBUG_ALWAYS, LOG_ERR, "event_add failed: %s", strerror(errno));
 902                                         abort();
 903                                 }
 904
 905                                 event_set(&listen_socket[listen_sockets].ev_udp,
 906                                                   listen_socket[listen_sockets].udp,
 907                                                   EV_READ|EV_PERSIST,
 908                                                   handle_incoming_vpn_data, (void *)(intptr_t)listen_sockets);
 909                                 if(event_add(&listen_socket[listen_sockets].ev_udp, NULL) < 0) {
 910                                         logger(DEBUG_ALWAYS, LOG_ERR, "event_add failed: %s", strerror(errno));
 911                                         abort();
 912                                 }
 913
 914                                 if(debug_level >= DEBUG_CONNECTIONS) {
 915                                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 916                                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 917                                         free(hostname);
 918                                 }
 919
 920                                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 921                                 listen_sockets++;
 922                         }
 923
 924                         freeaddrinfo(ai);
 925                 } while(cfg);
 926         }
 927
 928         if(listen_sockets)
 929                 logger(DEBUG_ALWAYS, LOG_NOTICE, "Ready");
 930         else {
 931                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
 932                 return false;
 933         }
 934
 935         last_config_check = time(NULL);
 936
 937         return true;
 938 }
 939
 940 /*
 941   initialize network
 942 */
 943 bool setup_network(void) {
 944         init_connections();
 945         init_subnets();
 946         init_nodes();
 947         init_edges();
 948         init_requests();
 949
 950         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 951                 if(pinginterval < 1) {
 952                         pinginterval = 86400;
 953                 }
 954         } else
 955                 pinginterval = 60;
 956
 957         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 958                 pingtimeout = 5;
 959         if(pingtimeout < 1 || pingtimeout > pinginterval)
 960                 pingtimeout = pinginterval;
 961
 962         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 963                 maxoutbufsize = 10 * MTU;
 964
 965         if(!setup_myself())
 966                 return false;
 967
 968         return true;
 969 }
 970
 971 /*
 972   close all open network connections
 973 */
 974 void close_network_connections(void) {
 975         splay_node_t *node, *next;
 976         connection_t *c;
 977         char *envp[5];
 978         int i;
 979
 980         for(node = connection_tree->head; node; node = next) {
 981                 next = node->next;
 982                 c = node->data;
 983                 /* Keep control connections open until the end, so they know when we really terminated */
 984                 if(c->status.control)
 985                         c->socket = -1;
 986                 c->outgoing = NULL;
 987                 terminate_connection(c, false);
 988         }
 989
 990         list_delete_list(outgoing_list);
 991
 992         if(myself && myself->connection) {
 993                 subnet_update(myself, NULL, false);
 994                 terminate_connection(myself->connection, false);
 995                 free_connection(myself->connection);
 996         }
 997
 998         for(i = 0; i < listen_sockets; i++) {
 999                 event_del(&listen_socket[i].ev_tcp);
1000                 event_del(&listen_socket[i].ev_udp);
1001                 close(listen_socket[i].tcp);
1002                 close(listen_socket[i].udp);
1003         }
1004
1005         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
1006         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
1007         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
1008         xasprintf(&envp[3], "NAME=%s", myself->name);
1009         envp[4] = NULL;
1010
1011         exit_requests();
1012         exit_edges();
1013         exit_subnets();
1014         exit_nodes();
1015         exit_connections();
1016
1017         execute_script("tinc-down", envp);
1018
1019         if(myport) free(myport);
1020
1021         for(i = 0; i < 4; i++)
1022                 free(envp[i]);
1023
1024         devops.close();
1025
1026         return;
1027 }