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