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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2013 Guus Sliepen <guus@tinc-vpn.org>
   5                   2006      Scott Lamb <slamb@slamb.org>
   6                   2010      Brandon Black <blblack@gmail.com>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License along
  19     with this program; if not, write to the Free Software Foundation, Inc.,
  20     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21 */
  22
  23 #include "system.h"
  24
  25 #include "cipher.h"
  26 #include "conf.h"
  27 #include "connection.h"
  28 #include "control.h"
  29 #include "device.h"
  30 #include "digest.h"
  31 #include "ecdsa.h"
  32 #include "graph.h"
  33 #include "logger.h"
  34 #include "names.h"
  35 #include "net.h"
  36 #include "netutl.h"
  37 #include "process.h"
  38 #include "protocol.h"
  39 #include "route.h"
  40 #include "rsa.h"
  41 #include "subnet.h"
  42 #include "utils.h"
  43 #include "xalloc.h"
  44
  45 char *myport;
  46 static io_t device_io;
  47 devops_t devops;
  48
  49 char *proxyhost;
  50 char *proxyport;
  51 char *proxyuser;
  52 char *proxypass;
  53 proxytype_t proxytype;
  54 int autoconnect;
  55 bool disablebuggypeers;
  56
  57 char *scriptinterpreter;
  58 char *scriptextension;
  59
  60 bool node_read_ecdsa_public_key(node_t *n) {
  61         if(ecdsa_active(&n->ecdsa))
  62                 return true;
  63
  64         splay_tree_t *config_tree;
  65         FILE *fp;
  66         char *pubname = NULL, *hcfname = NULL;
  67         char *p;
  68         bool result = false;
  69
  70         xasprintf(&hcfname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  71
  72         init_configuration(&config_tree);
  73         if(!read_config_file(config_tree, hcfname))
  74                 goto exit;
  75
  76         /* First, check for simple ECDSAPublicKey statement */
  77
  78         if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
  79                 result = ecdsa_set_base64_public_key(&n->ecdsa, p);
  80                 free(p);
  81                 goto exit;
  82         }
  83
  84         /* Else, check for ECDSAPublicKeyFile statement and read it */
  85
  86         if(!get_config_string(lookup_config(config_tree, "ECDSAPublicKeyFile"), &pubname))
  87                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  88
  89         fp = fopen(pubname, "r");
  90
  91         if(!fp) {
  92                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s", pubname, strerror(errno));
  93                 goto exit;
  94         }
  95
  96         result = ecdsa_read_pem_public_key(&n->ecdsa, fp);
  97         fclose(fp);
  98
  99 exit:
 100         exit_configuration(&config_tree);
 101         free(hcfname);
 102         free(pubname);
 103         return result;
 104 }
 105
 106 bool read_ecdsa_public_key(connection_t *c) {
 107         FILE *fp;
 108         char *fname;
 109         char *p;
 110         bool result;
 111
 112         /* First, check for simple ECDSAPublicKey statement */
 113
 114         if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
 115                 result = ecdsa_set_base64_public_key(&c->ecdsa, p);
 116                 free(p);
 117                 return result;
 118         }
 119
 120         /* Else, check for ECDSAPublicKeyFile statement and read it */
 121
 122         if(!get_config_string(lookup_config(c->config_tree, "ECDSAPublicKeyFile"), &fname))
 123                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 124
 125         fp = fopen(fname, "r");
 126
 127         if(!fp) {
 128                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s",
 129                            fname, strerror(errno));
 130                 free(fname);
 131                 return false;
 132         }
 133
 134         result = ecdsa_read_pem_public_key(&c->ecdsa, fp);
 135         fclose(fp);
 136
 137         if(!result)
 138                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing ECDSA public key file `%s' failed.", fname);
 139         free(fname);
 140         return result;
 141 }
 142
 143 bool read_rsa_public_key(connection_t *c) {
 144         FILE *fp;
 145         char *fname;
 146         char *n;
 147         bool result;
 148
 149         /* First, check for simple PublicKey statement */
 150
 151         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 152                 result = rsa_set_hex_public_key(&c->rsa, n, "FFFF");
 153                 free(n);
 154                 return result;
 155         }
 156
 157         /* Else, check for PublicKeyFile statement and read it */
 158
 159         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 160                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 161
 162         fp = fopen(fname, "r");
 163
 164         if(!fp) {
 165                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 166                 free(fname);
 167                 return false;
 168         }
 169
 170         result = rsa_read_pem_public_key(&c->rsa, fp);
 171         fclose(fp);
 172
 173         if(!result)
 174                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 175         free(fname);
 176         return result;
 177 }
 178
 179 static bool read_ecdsa_private_key(void) {
 180         FILE *fp;
 181         char *fname;
 182         bool result;
 183
 184         /* Check for PrivateKeyFile statement and read it */
 185
 186         if(!get_config_string(lookup_config(config_tree, "ECDSAPrivateKeyFile"), &fname))
 187                 xasprintf(&fname, "%s" SLASH "ecdsa_key.priv", confbase);
 188
 189         fp = fopen(fname, "r");
 190
 191         if(!fp) {
 192                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA private key file `%s': %s", fname, strerror(errno));
 193                 free(fname);
 194                 return false;
 195         }
 196
 197 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 198         struct stat s;
 199
 200         if(fstat(fileno(fp), &s)) {
 201                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat ECDSA private key file `%s': %s'", fname, strerror(errno));
 202                 free(fname);
 203                 return false;
 204         }
 205
 206         if(s.st_mode & ~0100700)
 207                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for ECDSA private key file `%s'!", fname);
 208 #endif
 209
 210         result = ecdsa_read_pem_private_key(&myself->connection->ecdsa, fp);
 211         fclose(fp);
 212
 213         if(!result)
 214                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 215         free(fname);
 216         return result;
 217 }
 218
 219 static bool read_rsa_private_key(void) {
 220         FILE *fp;
 221         char *fname;
 222         char *n, *d;
 223         bool result;
 224
 225         /* First, check for simple PrivateKey statement */
 226
 227         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 228                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 229                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 230                         free(d);
 231                         return false;
 232                 }
 233                 result = rsa_set_hex_private_key(&myself->connection->rsa, n, "FFFF", d);
 234                 free(n);
 235                 free(d);
 236                 return result;
 237         }
 238
 239         /* Else, check for PrivateKeyFile statement and read it */
 240
 241         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 242                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 243
 244         fp = fopen(fname, "r");
 245
 246         if(!fp) {
 247                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 248                            fname, strerror(errno));
 249                 free(fname);
 250                 return false;
 251         }
 252
 253 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 254         struct stat s;
 255
 256         if(fstat(fileno(fp), &s)) {
 257                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 258                 free(fname);
 259                 return false;
 260         }
 261
 262         if(s.st_mode & ~0100700)
 263                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 264 #endif
 265
 266         result = rsa_read_pem_private_key(&myself->connection->rsa, fp);
 267         fclose(fp);
 268
 269         if(!result)
 270                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 271         free(fname);
 272         return result;
 273 }
 274
 275 static timeout_t keyexpire_timeout;
 276
 277 static void keyexpire_handler(void *data) {
 278         regenerate_key();
 279         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 280 }
 281
 282 void regenerate_key(void) {
 283         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 284         send_key_changed();
 285 }
 286
 287 /*
 288   Read Subnets from all host config files
 289 */
 290 void load_all_subnets(void) {
 291         DIR *dir;
 292         struct dirent *ent;
 293         char *dname;
 294
 295         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 296         dir = opendir(dname);
 297         if(!dir) {
 298                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 299                 free(dname);
 300                 return;
 301         }
 302
 303         while((ent = readdir(dir))) {
 304                 if(!check_id(ent->d_name))
 305                         continue;
 306
 307                 node_t *n = lookup_node(ent->d_name);
 308                 #ifdef _DIRENT_HAVE_D_TYPE
 309                 //if(ent->d_type != DT_REG)
 310                 //      continue;
 311                 #endif
 312
 313                 char *fname;
 314                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, ent->d_name);
 315
 316                 splay_tree_t *config_tree;
 317                 init_configuration(&config_tree);
 318                 read_config_options(config_tree, ent->d_name);
 319                 read_config_file(config_tree, fname);
 320                 free(fname);
 321
 322                 if(!n) {
 323                         n = new_node();
 324                         n->name = xstrdup(ent->d_name);
 325                         node_add(n);
 326                 }
 327
 328                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 329                         subnet_t *s, *s2;
 330
 331                         if(!get_config_subnet(cfg, &s))
 332                                 continue;
 333
 334                         if((s2 = lookup_subnet(n, s))) {
 335                                 s2->expires = -1;
 336                         } else {
 337                                 subnet_add(n, s);
 338                         }
 339                 }
 340
 341                 exit_configuration(&config_tree);
 342         }
 343
 344         closedir(dir);
 345 }
 346
 347 void load_all_nodes(void) {
 348         DIR *dir;
 349         struct dirent *ent;
 350         char *dname;
 351
 352         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 353         dir = opendir(dname);
 354         if(!dir) {
 355                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 356                 free(dname);
 357                 return;
 358         }
 359
 360         while((ent = readdir(dir))) {
 361                 if(!check_id(ent->d_name))
 362                         continue;
 363
 364                 node_t *n = lookup_node(ent->d_name);
 365                 if(n)
 366                         continue;
 367
 368                 n = new_node();
 369                 n->name = xstrdup(ent->d_name);
 370                 node_add(n);
 371         }
 372
 373         closedir(dir);
 374 }
 375
 376
 377 char *get_name(void) {
 378         char *name = NULL;
 379
 380         get_config_string(lookup_config(config_tree, "Name"), &name);
 381
 382         if(!name)
 383                 return NULL;
 384
 385         if(*name == '$') {
 386                 char *envname = getenv(name + 1);
 387                 if(!envname) {
 388                         if(strcmp(name + 1, "HOST")) {
 389                                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1);
 390                                 return false;
 391                         }
 392                         char envname[32];
 393                         if(gethostname(envname, 32)) {
 394                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", strerror(errno));
 395                                 return false;
 396                         }
 397                         envname[31] = 0;
 398                 }
 399                 free(name);
 400                 name = xstrdup(envname);
 401                 for(char *c = name; *c; c++)
 402                         if(!isalnum(*c))
 403                                 *c = '_';
 404         }
 405
 406         if(!check_id(name)) {
 407                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
 408                 free(name);
 409                 return false;
 410         }
 411
 412         return name;
 413 }
 414
 415 bool setup_myself_reloadable(void) {
 416         char *proxy = NULL;
 417         char *rmode = NULL;
 418         char *fmode = NULL;
 419         char *bmode = NULL;
 420         char *afname = NULL;
 421         char *space;
 422         bool choice;
 423
 424         free(scriptinterpreter);
 425         scriptinterpreter = NULL;
 426         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 427
 428
 429         free(scriptextension);
 430         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 431 #ifdef HAVE_MINGW
 432                 scriptextension = xstrdup(".bat");
 433 #else
 434                 scriptextension = xstrdup("");
 435 #endif
 436
 437         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 438         if(proxy) {
 439                 if((space = strchr(proxy, ' ')))
 440                         *space++ = 0;
 441
 442                 if(!strcasecmp(proxy, "none")) {
 443                         proxytype = PROXY_NONE;
 444                 } else if(!strcasecmp(proxy, "socks4")) {
 445                         proxytype = PROXY_SOCKS4;
 446                 } else if(!strcasecmp(proxy, "socks4a")) {
 447                         proxytype = PROXY_SOCKS4A;
 448                 } else if(!strcasecmp(proxy, "socks5")) {
 449                         proxytype = PROXY_SOCKS5;
 450                 } else if(!strcasecmp(proxy, "http")) {
 451                         proxytype = PROXY_HTTP;
 452                 } else if(!strcasecmp(proxy, "exec")) {
 453                         proxytype = PROXY_EXEC;
 454                 } else {
 455                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 456                         return false;
 457                 }
 458
 459                 switch(proxytype) {
 460                         case PROXY_NONE:
 461                         default:
 462                                 break;
 463
 464                         case PROXY_EXEC:
 465                                 if(!space || !*space) {
 466                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 467                                         return false;
 468                                 }
 469                                 proxyhost =  xstrdup(space);
 470                                 break;
 471
 472                         case PROXY_SOCKS4:
 473                         case PROXY_SOCKS4A:
 474                         case PROXY_SOCKS5:
 475                         case PROXY_HTTP:
 476                                 proxyhost = space;
 477                                 if(space && (space = strchr(space, ' ')))
 478                                         *space++ = 0, proxyport = space;
 479                                 if(space && (space = strchr(space, ' ')))
 480                                         *space++ = 0, proxyuser = space;
 481                                 if(space && (space = strchr(space, ' ')))
 482                                         *space++ = 0, proxypass = space;
 483                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 484                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 485                                         return false;
 486                                 }
 487                                 proxyhost = xstrdup(proxyhost);
 488                                 proxyport = xstrdup(proxyport);
 489                                 if(proxyuser && *proxyuser)
 490                                         proxyuser = xstrdup(proxyuser);
 491                                 if(proxypass && *proxypass)
 492                                         proxypass = xstrdup(proxypass);
 493                                 break;
 494                 }
 495
 496                 free(proxy);
 497         }
 498
 499         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 500                 myself->options |= OPTION_INDIRECT;
 501
 502         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 503                 myself->options |= OPTION_TCPONLY;
 504
 505         if(myself->options & OPTION_TCPONLY)
 506                 myself->options |= OPTION_INDIRECT;
 507
 508         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 509         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 510
 511         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 512                 if(!strcasecmp(rmode, "router"))
 513                         routing_mode = RMODE_ROUTER;
 514                 else if(!strcasecmp(rmode, "switch"))
 515                         routing_mode = RMODE_SWITCH;
 516                 else if(!strcasecmp(rmode, "hub"))
 517                         routing_mode = RMODE_HUB;
 518                 else {
 519                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 520                         return false;
 521                 }
 522                 free(rmode);
 523         }
 524
 525         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 526                 if(!strcasecmp(fmode, "off"))
 527                         forwarding_mode = FMODE_OFF;
 528                 else if(!strcasecmp(fmode, "internal"))
 529                         forwarding_mode = FMODE_INTERNAL;
 530                 else if(!strcasecmp(fmode, "kernel"))
 531                         forwarding_mode = FMODE_KERNEL;
 532                 else {
 533                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 534                         return false;
 535                 }
 536                 free(fmode);
 537         }
 538
 539         choice = true;
 540         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 541         if(choice)
 542                 myself->options |= OPTION_PMTU_DISCOVERY;
 543
 544         choice = true;
 545         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 546         if(choice)
 547                 myself->options |= OPTION_CLAMP_MSS;
 548
 549         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 550         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 551         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 552                 if(!strcasecmp(bmode, "no"))
 553                         broadcast_mode = BMODE_NONE;
 554                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 555                         broadcast_mode = BMODE_MST;
 556                 else if(!strcasecmp(bmode, "direct"))
 557                         broadcast_mode = BMODE_DIRECT;
 558                 else {
 559                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 560                         return false;
 561                 }
 562                 free(bmode);
 563         }
 564
 565 #if !defined(SOL_IP) || !defined(IP_TOS)
 566         if(priorityinheritance)
 567                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 568 #endif
 569
 570         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 571                 macexpire = 600;
 572
 573         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 574                 if(maxtimeout <= 0) {
 575                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 576                         return false;
 577                 }
 578         } else
 579                 maxtimeout = 900;
 580
 581         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 582                 if(!strcasecmp(afname, "IPv4"))
 583                         addressfamily = AF_INET;
 584                 else if(!strcasecmp(afname, "IPv6"))
 585                         addressfamily = AF_INET6;
 586                 else if(!strcasecmp(afname, "any"))
 587                         addressfamily = AF_UNSPEC;
 588                 else {
 589                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 590                         return false;
 591                 }
 592                 free(afname);
 593         }
 594
 595         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 596
 597         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 598                 keylifetime = 3600;
 599
 600         get_config_int(lookup_config(config_tree, "AutoConnect"), &autoconnect);
 601
 602         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 603
 604         return true;
 605 }
 606
 607 /*
 608   Configure node_t myself and set up the local sockets (listen only)
 609 */
 610 static bool setup_myself(void) {
 611         char *name, *hostname, *cipher, *digest, *type;
 612         char *fname = NULL;
 613         char *address = NULL;
 614
 615         if(!(name = get_name())) {
 616                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 617                 return false;
 618         }
 619
 620         myself = new_node();
 621         myself->connection = new_connection();
 622         myself->name = name;
 623         myself->connection->name = xstrdup(name);
 624         xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 625         read_config_options(config_tree, name);
 626         read_config_file(config_tree, fname);
 627         free(fname);
 628
 629         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 630                 myport = xstrdup("655");
 631
 632         xasprintf(&myself->hostname, "MYSELF port %s", myport);
 633         myself->connection->hostname = xstrdup(myself->hostname);
 634
 635         myself->connection->options = 0;
 636         myself->connection->protocol_major = PROT_MAJOR;
 637         myself->connection->protocol_minor = PROT_MINOR;
 638
 639         myself->options |= PROT_MINOR << 24;
 640
 641         get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental);
 642
 643         if(experimental && !read_ecdsa_private_key())
 644                 return false;
 645
 646         if(!read_rsa_private_key())
 647                 return false;
 648
 649         if(!atoi(myport)) {
 650                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 651                 sockaddr_t sa;
 652                 if(!ai || !ai->ai_addr)
 653                         return false;
 654                 free(myport);
 655                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 656                 sockaddr2str(&sa, NULL, &myport);
 657         }
 658
 659         /* Read in all the subnets specified in the host configuration file */
 660
 661         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 662                 subnet_t *subnet;
 663
 664                 if(!get_config_subnet(cfg, &subnet))
 665                         return false;
 666
 667                 subnet_add(myself, subnet);
 668         }
 669
 670         /* Check some options */
 671
 672         if(!setup_myself_reloadable())
 673                 return false;
 674
 675         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 676         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 677         strictsubnets |= tunnelserver;
 678
 679
 680
 681         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 682                 if(udp_rcvbuf <= 0) {
 683                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 684                         return false;
 685                 }
 686         }
 687
 688         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 689                 if(udp_sndbuf <= 0) {
 690                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 691                         return false;
 692                 }
 693         }
 694
 695         int replaywin_int;
 696         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 697                 if(replaywin_int < 0) {
 698                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 699                         return false;
 700                 }
 701                 replaywin = (unsigned)replaywin_int;
 702                 sptps_replaywin = replaywin;
 703         }
 704
 705         /* Generate packet encryption key */
 706
 707         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 708                 cipher = xstrdup("blowfish");
 709
 710         if(!cipher_open_by_name(&myself->incipher, cipher)) {
 711                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 712                 return false;
 713         }
 714
 715         free(cipher);
 716
 717         send_key_changed();
 718         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 719
 720         /* Check if we want to use message authentication codes... */
 721
 722         int maclength = 4;
 723         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 724
 725         if(maclength < 0) {
 726                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 727                 return false;
 728         }
 729
 730         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 731                 digest = xstrdup("sha1");
 732
 733         if(!digest_open_by_name(&myself->indigest, digest, maclength)) {
 734                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 735                 return false;
 736         }
 737
 738         free(digest);
 739
 740         /* Compression */
 741
 742         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 743                 if(myself->incompression < 0 || myself->incompression > 11) {
 744                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 745                         return false;
 746                 }
 747         } else
 748                 myself->incompression = 0;
 749
 750         myself->connection->outcompression = 0;
 751
 752         /* Done */
 753
 754         myself->nexthop = myself;
 755         myself->via = myself;
 756         myself->status.reachable = true;
 757         myself->last_state_change = now.tv_sec;
 758         myself->status.sptps = experimental;
 759         node_add(myself);
 760
 761         graph();
 762
 763         if(strictsubnets)
 764                 load_all_subnets();
 765         else if(autoconnect)
 766                 load_all_nodes();
 767
 768         /* Open device */
 769
 770         devops = os_devops;
 771
 772         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 773                 if(!strcasecmp(type, "dummy"))
 774                         devops = dummy_devops;
 775                 else if(!strcasecmp(type, "raw_socket"))
 776                         devops = raw_socket_devops;
 777                 else if(!strcasecmp(type, "multicast"))
 778                         devops = multicast_devops;
 779 #ifdef ENABLE_UML
 780                 else if(!strcasecmp(type, "uml"))
 781                         devops = uml_devops;
 782 #endif
 783 #ifdef ENABLE_VDE
 784                 else if(!strcasecmp(type, "vde"))
 785                         devops = vde_devops;
 786 #endif
 787         }
 788
 789         if(!devops.setup())
 790                 return false;
 791
 792         if(device_fd >= 0)
 793                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 794
 795         /* Run tinc-up script to further initialize the tap interface */
 796         char *envp[5];
 797         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 798         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 799         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 800         xasprintf(&envp[3], "NAME=%s", myself->name);
 801         envp[4] = NULL;
 802
 803         execute_script("tinc-up", envp);
 804
 805         for(int i = 0; i < 4; i++)
 806                 free(envp[i]);
 807
 808         /* Run subnet-up scripts for our own subnets */
 809
 810         subnet_update(myself, NULL, true);
 811
 812         /* Open sockets */
 813
 814 #ifndef HAVE_MINGW
 815         int unix_fd = socket(AF_UNIX, SOCK_STREAM, 0);
 816         if(unix_fd < 0) {
 817                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not create UNIX socket: %s", sockstrerror(errno));
 818                 return false;
 819         }
 820
 821         struct sockaddr_un sa;
 822         sa.sun_family = AF_UNIX;
 823         strncpy(sa.sun_path, unixsocketname, sizeof sa.sun_path);
 824
 825         if(connect(unix_fd, (struct sockaddr *)&sa, sizeof sa) >= 0) {
 826                 logger(DEBUG_ALWAYS, LOG_ERR, "UNIX socket %s is still in use!", unixsocketname);
 827                 return false;
 828         }
 829
 830         unlink(unixsocketname);
 831
 832         if(bind(unix_fd, (struct sockaddr *)&sa, sizeof sa) < 0) {
 833                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not bind UNIX socket to %s: %s", unixsocketname, sockstrerror(errno));
 834                 return false;
 835         }
 836
 837         if(listen(unix_fd, 3) < 0) {
 838                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not listen on UNIX socket %s: %s", unixsocketname, sockstrerror(errno));
 839                 return false;
 840         }
 841
 842         io_add(&unix_socket, handle_new_unix_connection, &unix_socket, unix_fd, IO_READ);
 843 #endif
 844
 845         if(!do_detach && getenv("LISTEN_FDS")) {
 846                 sockaddr_t sa;
 847                 socklen_t salen;
 848
 849                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 850 #ifdef HAVE_UNSETENV
 851                 unsetenv("LISTEN_FDS");
 852 #endif
 853
 854                 if(listen_sockets > MAXSOCKETS) {
 855                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 856                         return false;
 857                 }
 858
 859                 for(int i = 0; i < listen_sockets; i++) {
 860                         salen = sizeof sa;
 861                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 862                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
 863                                 return false;
 864                         }
 865
 866 #ifdef FD_CLOEXEC
 867                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 868 #endif
 869
 870                         int udp_fd = setup_vpn_in_socket(&sa);
 871                         if(udp_fd < 0)
 872                                 return false;
 873
 874                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
 875                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
 876
 877                         if(debug_level >= DEBUG_CONNECTIONS) {
 878                                 hostname = sockaddr2hostname(&sa);
 879                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 880                                 free(hostname);
 881                         }
 882
 883                         memcpy(&listen_socket[i].sa, &sa, salen);
 884                 }
 885         } else {
 886                 listen_sockets = 0;
 887                 config_t *cfg = lookup_config(config_tree, "BindToAddress");
 888
 889                 do {
 890                         get_config_string(cfg, &address);
 891                         if(cfg)
 892                                 cfg = lookup_config_next(config_tree, cfg);
 893
 894                         char *port = myport;
 895
 896                         if(address) {
 897                                 char *space = strchr(address, ' ');
 898                                 if(space) {
 899                                         *space++ = 0;
 900                                         port = space;
 901                                 }
 902
 903                                 if(!strcmp(address, "*"))
 904                                         *address = 0;
 905                         }
 906
 907                         struct addrinfo *ai, hint = {0};
 908                         hint.ai_family = addressfamily;
 909                         hint.ai_socktype = SOCK_STREAM;
 910                         hint.ai_protocol = IPPROTO_TCP;
 911                         hint.ai_flags = AI_PASSIVE;
 912
 913                         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 914                         free(address);
 915
 916                         if(err || !ai) {
 917                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
 918                                            gai_strerror(err));
 919                                 return false;
 920                         }
 921
 922                         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 923                                 if(listen_sockets >= MAXSOCKETS) {
 924                                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 925                                         return false;
 926                                 }
 927
 928                                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 929
 930                                 if(tcp_fd < 0)
 931                                         continue;
 932
 933                                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 934
 935                                 if(tcp_fd < 0) {
 936                                         close(tcp_fd);
 937                                         continue;
 938                                 }
 939
 940                                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 941                                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 942
 943                                 if(debug_level >= DEBUG_CONNECTIONS) {
 944                                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 945                                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 946                                         free(hostname);
 947                                 }
 948
 949                                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 950                                 listen_sockets++;
 951                         }
 952
 953                         freeaddrinfo(ai);
 954                 } while(cfg);
 955         }
 956
 957         if(listen_sockets)
 958                 logger(DEBUG_ALWAYS, LOG_NOTICE, "Ready");
 959         else {
 960                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
 961                 return false;
 962         }
 963
 964         last_config_check = now.tv_sec;
 965
 966         return true;
 967 }
 968
 969 /*
 970   initialize network
 971 */
 972 bool setup_network(void) {
 973         init_connections();
 974         init_subnets();
 975         init_nodes();
 976         init_edges();
 977         init_requests();
 978
 979         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 980                 if(pinginterval < 1) {
 981                         pinginterval = 86400;
 982                 }
 983         } else
 984                 pinginterval = 60;
 985
 986         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 987                 pingtimeout = 5;
 988         if(pingtimeout < 1 || pingtimeout > pinginterval)
 989                 pingtimeout = pinginterval;
 990
 991         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 992                 maxoutbufsize = 10 * MTU;
 993
 994         if(!setup_myself())
 995                 return false;
 996
 997         return true;
 998 }
 999
1000 /*
1001   close all open network connections
1002 */
1003 void close_network_connections(void) {
1004         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1005                 next = node->next;
1006                 connection_t *c = node->data;
1007                 /* Keep control connections open until the end, so they know when we really terminated */
1008                 if(c->status.control)
1009                         c->socket = -1;
1010                 c->outgoing = NULL;
1011                 terminate_connection(c, false);
1012         }
1013
1014         list_delete_list(outgoing_list);
1015
1016         if(myself && myself->connection) {
1017                 subnet_update(myself, NULL, false);
1018                 terminate_connection(myself->connection, false);
1019                 free_connection(myself->connection);
1020         }
1021
1022         for(int i = 0; i < listen_sockets; i++) {
1023                 io_del(&listen_socket[i].tcp);
1024                 io_del(&listen_socket[i].udp);
1025                 close(listen_socket[i].tcp.fd);
1026                 close(listen_socket[i].udp.fd);
1027         }
1028
1029 #ifndef HAVE_MINGW
1030         io_del(&unix_socket);
1031         close(unix_socket.fd);
1032 #endif
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 }