www.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
  69         xasprintf(&hcfname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  70
  71         init_configuration(&config_tree);
  72         if(!read_config_file(config_tree, hcfname))
  73                 goto exit;
  74
  75         /* First, check for simple ECDSAPublicKey statement */
  76
  77         if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
  78                 n->ecdsa = ecdsa_set_base64_public_key(p);
  79                 free(p);
  80                 goto exit;
  81         }
  82
  83         /* Else, check for ECDSAPublicKeyFile statement and read it */
  84
  85         if(!get_config_string(lookup_config(config_tree, "ECDSAPublicKeyFile"), &pubname))
  86                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  87
  88         fp = fopen(pubname, "r");
  89
  90         if(!fp) {
  91                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s", pubname, strerror(errno));
  92                 goto exit;
  93         }
  94
  95         n->ecdsa = ecdsa_read_pem_public_key(fp);
  96         fclose(fp);
  97
  98 exit:
  99         exit_configuration(&config_tree);
 100         free(hcfname);
 101         free(pubname);
 102         return n->ecdsa;
 103 }
 104
 105 bool read_ecdsa_public_key(connection_t *c) {
 106         if(ecdsa_active(c->ecdsa))
 107                 return true;
 108
 109         FILE *fp;
 110         char *fname;
 111         char *p;
 112
 113         /* First, check for simple ECDSAPublicKey statement */
 114
 115         if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
 116                 c->ecdsa = ecdsa_set_base64_public_key(p);
 117                 free(p);
 118                 return c->ecdsa;
 119         }
 120
 121         /* Else, check for ECDSAPublicKeyFile statement and read it */
 122
 123         if(!get_config_string(lookup_config(c->config_tree, "ECDSAPublicKeyFile"), &fname))
 124                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 125
 126         fp = fopen(fname, "r");
 127
 128         if(!fp) {
 129                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s",
 130                            fname, strerror(errno));
 131                 free(fname);
 132                 return false;
 133         }
 134
 135         c->ecdsa = ecdsa_read_pem_public_key(fp);
 136         fclose(fp);
 137
 138         if(!c->ecdsa)
 139                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing ECDSA public key file `%s' failed.", fname);
 140         free(fname);
 141         return c->ecdsa;
 142 }
 143
 144 bool read_rsa_public_key(connection_t *c) {
 145         if(ecdsa_active(c->ecdsa))
 146                 return true;
 147
 148         FILE *fp;
 149         char *fname;
 150         char *n;
 151
 152         /* First, check for simple PublicKey statement */
 153
 154         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 155                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 156                 free(n);
 157                 return c->rsa;
 158         }
 159
 160         /* Else, check for PublicKeyFile statement and read it */
 161
 162         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 163                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 164
 165         fp = fopen(fname, "r");
 166
 167         if(!fp) {
 168                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 169                 free(fname);
 170                 return false;
 171         }
 172
 173         c->rsa = rsa_read_pem_public_key(fp);
 174         fclose(fp);
 175
 176         if(!c->rsa)
 177                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 178         free(fname);
 179         return c->rsa;
 180 }
 181
 182 static bool read_ecdsa_private_key(void) {
 183         FILE *fp;
 184         char *fname;
 185
 186         /* Check for PrivateKeyFile statement and read it */
 187
 188         if(!get_config_string(lookup_config(config_tree, "ECDSAPrivateKeyFile"), &fname))
 189                 xasprintf(&fname, "%s" SLASH "ecdsa_key.priv", confbase);
 190
 191         fp = fopen(fname, "r");
 192
 193         if(!fp) {
 194                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA private key file `%s': %s", fname, strerror(errno));
 195                 free(fname);
 196                 return false;
 197         }
 198
 199 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 200         struct stat s;
 201
 202         if(fstat(fileno(fp), &s)) {
 203                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat ECDSA private key file `%s': %s'", fname, strerror(errno));
 204                 free(fname);
 205                 return false;
 206         }
 207
 208         if(s.st_mode & ~0100700)
 209                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for ECDSA private key file `%s'!", fname);
 210 #endif
 211
 212         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 213         fclose(fp);
 214
 215         if(!myself->connection->ecdsa)
 216                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 217         free(fname);
 218         return myself->connection->ecdsa;
 219 }
 220
 221 static bool read_rsa_private_key(void) {
 222         FILE *fp;
 223         char *fname;
 224         char *n, *d;
 225
 226         /* First, check for simple PrivateKey statement */
 227
 228         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 229                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 230                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 231                         free(d);
 232                         return false;
 233                 }
 234                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 235                 free(n);
 236                 free(d);
 237                 return myself->connection->rsa;
 238         }
 239
 240         /* Else, check for PrivateKeyFile statement and read it */
 241
 242         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 243                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 244
 245         fp = fopen(fname, "r");
 246
 247         if(!fp) {
 248                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 249                            fname, strerror(errno));
 250                 free(fname);
 251                 return false;
 252         }
 253
 254 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 255         struct stat s;
 256
 257         if(fstat(fileno(fp), &s)) {
 258                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 259                 free(fname);
 260                 return false;
 261         }
 262
 263         if(s.st_mode & ~0100700)
 264                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 265 #endif
 266
 267         myself->connection->rsa = rsa_read_pem_private_key(fp);
 268         fclose(fp);
 269
 270         if(!myself->connection->rsa)
 271                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 272         free(fname);
 273         return myself->connection->rsa;
 274 }
 275
 276 static timeout_t keyexpire_timeout;
 277
 278 static void keyexpire_handler(void *data) {
 279         regenerate_key();
 280         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 281 }
 282
 283 void regenerate_key(void) {
 284         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 285         send_key_changed();
 286 }
 287
 288 /*
 289   Read Subnets from all host config files
 290 */
 291 void load_all_subnets(void) {
 292         DIR *dir;
 293         struct dirent *ent;
 294         char *dname;
 295
 296         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 297         dir = opendir(dname);
 298         if(!dir) {
 299                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 300                 free(dname);
 301                 return;
 302         }
 303
 304         while((ent = readdir(dir))) {
 305                 if(!check_id(ent->d_name))
 306                         continue;
 307
 308                 node_t *n = lookup_node(ent->d_name);
 309                 #ifdef _DIRENT_HAVE_D_TYPE
 310                 //if(ent->d_type != DT_REG)
 311                 //      continue;
 312                 #endif
 313
 314                 char *fname;
 315                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, ent->d_name);
 316
 317                 splay_tree_t *config_tree;
 318                 init_configuration(&config_tree);
 319                 read_config_options(config_tree, ent->d_name);
 320                 read_config_file(config_tree, fname);
 321                 free(fname);
 322
 323                 if(!n) {
 324                         n = new_node();
 325                         n->name = xstrdup(ent->d_name);
 326                         node_add(n);
 327                 }
 328
 329                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 330                         subnet_t *s, *s2;
 331
 332                         if(!get_config_subnet(cfg, &s))
 333                                 continue;
 334
 335                         if((s2 = lookup_subnet(n, s))) {
 336                                 s2->expires = -1;
 337                         } else {
 338                                 subnet_add(n, s);
 339                         }
 340                 }
 341
 342                 exit_configuration(&config_tree);
 343         }
 344
 345         closedir(dir);
 346 }
 347
 348 void load_all_nodes(void) {
 349         DIR *dir;
 350         struct dirent *ent;
 351         char *dname;
 352
 353         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 354         dir = opendir(dname);
 355         if(!dir) {
 356                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 357                 free(dname);
 358                 return;
 359         }
 360
 361         while((ent = readdir(dir))) {
 362                 if(!check_id(ent->d_name))
 363                         continue;
 364
 365                 node_t *n = lookup_node(ent->d_name);
 366                 if(n)
 367                         continue;
 368
 369                 n = new_node();
 370                 n->name = xstrdup(ent->d_name);
 371                 node_add(n);
 372         }
 373
 374         closedir(dir);
 375 }
 376
 377
 378 char *get_name(void) {
 379         char *name = NULL;
 380
 381         get_config_string(lookup_config(config_tree, "Name"), &name);
 382
 383         if(!name)
 384                 return NULL;
 385
 386         if(*name == '$') {
 387                 char *envname = getenv(name + 1);
 388                 if(!envname) {
 389                         if(strcmp(name + 1, "HOST")) {
 390                                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1);
 391                                 return false;
 392                         }
 393                         char envname[32];
 394                         if(gethostname(envname, 32)) {
 395                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", strerror(errno));
 396                                 return false;
 397                         }
 398                         envname[31] = 0;
 399                 }
 400                 free(name);
 401                 name = xstrdup(envname);
 402                 for(char *c = name; *c; c++)
 403                         if(!isalnum(*c))
 404                                 *c = '_';
 405         }
 406
 407         if(!check_id(name)) {
 408                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
 409                 free(name);
 410                 return false;
 411         }
 412
 413         return name;
 414 }
 415
 416 bool setup_myself_reloadable(void) {
 417         char *proxy = NULL;
 418         char *rmode = NULL;
 419         char *fmode = NULL;
 420         char *bmode = NULL;
 421         char *afname = NULL;
 422         char *space;
 423         bool choice;
 424
 425         free(scriptinterpreter);
 426         scriptinterpreter = NULL;
 427         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 428
 429
 430         free(scriptextension);
 431         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 432 #ifdef HAVE_MINGW
 433                 scriptextension = xstrdup(".bat");
 434 #else
 435                 scriptextension = xstrdup("");
 436 #endif
 437
 438         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 439         if(proxy) {
 440                 if((space = strchr(proxy, ' ')))
 441                         *space++ = 0;
 442
 443                 if(!strcasecmp(proxy, "none")) {
 444                         proxytype = PROXY_NONE;
 445                 } else if(!strcasecmp(proxy, "socks4")) {
 446                         proxytype = PROXY_SOCKS4;
 447                 } else if(!strcasecmp(proxy, "socks4a")) {
 448                         proxytype = PROXY_SOCKS4A;
 449                 } else if(!strcasecmp(proxy, "socks5")) {
 450                         proxytype = PROXY_SOCKS5;
 451                 } else if(!strcasecmp(proxy, "http")) {
 452                         proxytype = PROXY_HTTP;
 453                 } else if(!strcasecmp(proxy, "exec")) {
 454                         proxytype = PROXY_EXEC;
 455                 } else {
 456                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 457                         return false;
 458                 }
 459
 460                 switch(proxytype) {
 461                         case PROXY_NONE:
 462                         default:
 463                                 break;
 464
 465                         case PROXY_EXEC:
 466                                 if(!space || !*space) {
 467                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 468                                         return false;
 469                                 }
 470                                 proxyhost =  xstrdup(space);
 471                                 break;
 472
 473                         case PROXY_SOCKS4:
 474                         case PROXY_SOCKS4A:
 475                         case PROXY_SOCKS5:
 476                         case PROXY_HTTP:
 477                                 proxyhost = space;
 478                                 if(space && (space = strchr(space, ' ')))
 479                                         *space++ = 0, proxyport = space;
 480                                 if(space && (space = strchr(space, ' ')))
 481                                         *space++ = 0, proxyuser = space;
 482                                 if(space && (space = strchr(space, ' ')))
 483                                         *space++ = 0, proxypass = space;
 484                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 485                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 486                                         return false;
 487                                 }
 488                                 proxyhost = xstrdup(proxyhost);
 489                                 proxyport = xstrdup(proxyport);
 490                                 if(proxyuser && *proxyuser)
 491                                         proxyuser = xstrdup(proxyuser);
 492                                 if(proxypass && *proxypass)
 493                                         proxypass = xstrdup(proxypass);
 494                                 break;
 495                 }
 496
 497                 free(proxy);
 498         }
 499
 500         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 501                 myself->options |= OPTION_INDIRECT;
 502
 503         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 504                 myself->options |= OPTION_TCPONLY;
 505
 506         if(myself->options & OPTION_TCPONLY)
 507                 myself->options |= OPTION_INDIRECT;
 508
 509         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 510         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 511
 512         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 513                 if(!strcasecmp(rmode, "router"))
 514                         routing_mode = RMODE_ROUTER;
 515                 else if(!strcasecmp(rmode, "switch"))
 516                         routing_mode = RMODE_SWITCH;
 517                 else if(!strcasecmp(rmode, "hub"))
 518                         routing_mode = RMODE_HUB;
 519                 else {
 520                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 521                         return false;
 522                 }
 523                 free(rmode);
 524         }
 525
 526         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 527                 if(!strcasecmp(fmode, "off"))
 528                         forwarding_mode = FMODE_OFF;
 529                 else if(!strcasecmp(fmode, "internal"))
 530                         forwarding_mode = FMODE_INTERNAL;
 531                 else if(!strcasecmp(fmode, "kernel"))
 532                         forwarding_mode = FMODE_KERNEL;
 533                 else {
 534                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 535                         return false;
 536                 }
 537                 free(fmode);
 538         }
 539
 540         choice = true;
 541         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 542         if(choice)
 543                 myself->options |= OPTION_PMTU_DISCOVERY;
 544
 545         choice = true;
 546         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 547         if(choice)
 548                 myself->options |= OPTION_CLAMP_MSS;
 549
 550         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 551         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 552         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 553                 if(!strcasecmp(bmode, "no"))
 554                         broadcast_mode = BMODE_NONE;
 555                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 556                         broadcast_mode = BMODE_MST;
 557                 else if(!strcasecmp(bmode, "direct"))
 558                         broadcast_mode = BMODE_DIRECT;
 559                 else {
 560                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 561                         return false;
 562                 }
 563                 free(bmode);
 564         }
 565
 566 #if !defined(SOL_IP) || !defined(IP_TOS)
 567         if(priorityinheritance)
 568                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 569 #endif
 570
 571         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 572                 macexpire = 600;
 573
 574         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 575                 if(maxtimeout <= 0) {
 576                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 577                         return false;
 578                 }
 579         } else
 580                 maxtimeout = 900;
 581
 582         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 583                 if(!strcasecmp(afname, "IPv4"))
 584                         addressfamily = AF_INET;
 585                 else if(!strcasecmp(afname, "IPv6"))
 586                         addressfamily = AF_INET6;
 587                 else if(!strcasecmp(afname, "any"))
 588                         addressfamily = AF_UNSPEC;
 589                 else {
 590                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 591                         return false;
 592                 }
 593                 free(afname);
 594         }
 595
 596         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 597
 598         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 599                 keylifetime = 3600;
 600
 601         get_config_int(lookup_config(config_tree, "AutoConnect"), &autoconnect);
 602
 603         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 604
 605         return true;
 606 }
 607
 608 /*
 609   Configure node_t myself and set up the local sockets (listen only)
 610 */
 611 static bool setup_myself(void) {
 612         char *name, *hostname, *cipher, *digest, *type;
 613         char *fname = NULL;
 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         xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 626         read_config_options(config_tree, name);
 627         read_config_file(config_tree, fname);
 628         free(fname);
 629
 630         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 631                 myport = xstrdup("655");
 632
 633         xasprintf(&myself->hostname, "MYSELF port %s", myport);
 634         myself->connection->hostname = xstrdup(myself->hostname);
 635
 636         myself->connection->options = 0;
 637         myself->connection->protocol_major = PROT_MAJOR;
 638         myself->connection->protocol_minor = PROT_MINOR;
 639
 640         myself->options |= PROT_MINOR << 24;
 641
 642         get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental);
 643
 644         if(experimental && !read_ecdsa_private_key())
 645                 return false;
 646
 647         if(!read_rsa_private_key())
 648                 return false;
 649
 650         if(!atoi(myport)) {
 651                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 652                 sockaddr_t sa;
 653                 if(!ai || !ai->ai_addr)
 654                         return false;
 655                 free(myport);
 656                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 657                 sockaddr2str(&sa, NULL, &myport);
 658         }
 659
 660         /* Read in all the subnets specified in the host configuration file */
 661
 662         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 663                 subnet_t *subnet;
 664
 665                 if(!get_config_subnet(cfg, &subnet))
 666                         return false;
 667
 668                 subnet_add(myself, subnet);
 669         }
 670
 671         /* Check some options */
 672
 673         if(!setup_myself_reloadable())
 674                 return false;
 675
 676         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 677         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 678         strictsubnets |= tunnelserver;
 679
 680
 681
 682         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 683                 if(udp_rcvbuf <= 0) {
 684                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 685                         return false;
 686                 }
 687         }
 688
 689         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 690                 if(udp_sndbuf <= 0) {
 691                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 692                         return false;
 693                 }
 694         }
 695
 696         int replaywin_int;
 697         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 698                 if(replaywin_int < 0) {
 699                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 700                         return false;
 701                 }
 702                 replaywin = (unsigned)replaywin_int;
 703                 sptps_replaywin = replaywin;
 704         }
 705
 706         /* Generate packet encryption key */
 707
 708         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 709                 cipher = xstrdup("blowfish");
 710
 711         if(!(myself->incipher = cipher_open_by_name(cipher))) {
 712                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 713                 return false;
 714         }
 715
 716         free(cipher);
 717
 718         send_key_changed();
 719         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 720
 721         /* Check if we want to use message authentication codes... */
 722
 723         int maclength = 4;
 724         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 725
 726         if(maclength < 0) {
 727                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 728                 return false;
 729         }
 730
 731         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 732                 digest = xstrdup("sha1");
 733
 734         if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 735                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 736                 return false;
 737         }
 738
 739         free(digest);
 740
 741         /* Compression */
 742
 743         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 744                 if(myself->incompression < 0 || myself->incompression > 11) {
 745                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 746                         return false;
 747                 }
 748         } else
 749                 myself->incompression = 0;
 750
 751         myself->connection->outcompression = 0;
 752
 753         /* Done */
 754
 755         myself->nexthop = myself;
 756         myself->via = myself;
 757         myself->status.reachable = true;
 758         myself->last_state_change = now.tv_sec;
 759         myself->status.sptps = experimental;
 760         node_add(myself);
 761
 762         graph();
 763
 764         if(strictsubnets)
 765                 load_all_subnets();
 766         else if(autoconnect)
 767                 load_all_nodes();
 768
 769         /* Open device */
 770
 771         devops = os_devops;
 772
 773         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 774                 if(!strcasecmp(type, "dummy"))
 775                         devops = dummy_devops;
 776                 else if(!strcasecmp(type, "raw_socket"))
 777                         devops = raw_socket_devops;
 778                 else if(!strcasecmp(type, "multicast"))
 779                         devops = multicast_devops;
 780 #ifdef ENABLE_UML
 781                 else if(!strcasecmp(type, "uml"))
 782                         devops = uml_devops;
 783 #endif
 784 #ifdef ENABLE_VDE
 785                 else if(!strcasecmp(type, "vde"))
 786                         devops = vde_devops;
 787 #endif
 788         }
 789
 790         if(!devops.setup())
 791                 return false;
 792
 793         if(device_fd >= 0)
 794                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 795
 796         /* Run tinc-up script to further initialize the tap interface */
 797         char *envp[5];
 798         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 799         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 800         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 801         xasprintf(&envp[3], "NAME=%s", myself->name);
 802         envp[4] = NULL;
 803
 804         execute_script("tinc-up", envp);
 805
 806         for(int i = 0; i < 4; i++)
 807                 free(envp[i]);
 808
 809         /* Run subnet-up scripts for our own subnets */
 810
 811         subnet_update(myself, NULL, true);
 812
 813         /* Open sockets */
 814
 815 #ifndef HAVE_MINGW
 816         int unix_fd = socket(AF_UNIX, SOCK_STREAM, 0);
 817         if(unix_fd < 0) {
 818                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not create UNIX socket: %s", sockstrerror(errno));
 819                 return false;
 820         }
 821
 822         struct sockaddr_un sa;
 823         sa.sun_family = AF_UNIX;
 824         strncpy(sa.sun_path, unixsocketname, sizeof sa.sun_path);
 825
 826         if(connect(unix_fd, (struct sockaddr *)&sa, sizeof sa) >= 0) {
 827                 logger(DEBUG_ALWAYS, LOG_ERR, "UNIX socket %s is still in use!", unixsocketname);
 828                 return false;
 829         }
 830
 831         unlink(unixsocketname);
 832
 833         if(bind(unix_fd, (struct sockaddr *)&sa, sizeof sa) < 0) {
 834                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not bind UNIX socket to %s: %s", unixsocketname, sockstrerror(errno));
 835                 return false;
 836         }
 837
 838         if(listen(unix_fd, 3) < 0) {
 839                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not listen on UNIX socket %s: %s", unixsocketname, sockstrerror(errno));
 840                 return false;
 841         }
 842
 843         io_add(&unix_socket, handle_new_unix_connection, &unix_socket, unix_fd, IO_READ);
 844 #endif
 845
 846         if(!do_detach && getenv("LISTEN_FDS")) {
 847                 sockaddr_t sa;
 848                 socklen_t salen;
 849
 850                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 851 #ifdef HAVE_UNSETENV
 852                 unsetenv("LISTEN_FDS");
 853 #endif
 854
 855                 if(listen_sockets > MAXSOCKETS) {
 856                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 857                         return false;
 858                 }
 859
 860                 for(int i = 0; i < listen_sockets; i++) {
 861                         salen = sizeof sa;
 862                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 863                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
 864                                 return false;
 865                         }
 866
 867 #ifdef FD_CLOEXEC
 868                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 869 #endif
 870
 871                         int udp_fd = setup_vpn_in_socket(&sa);
 872                         if(udp_fd < 0)
 873                                 return false;
 874
 875                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
 876                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
 877
 878                         if(debug_level >= DEBUG_CONNECTIONS) {
 879                                 hostname = sockaddr2hostname(&sa);
 880                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 881                                 free(hostname);
 882                         }
 883
 884                         memcpy(&listen_socket[i].sa, &sa, salen);
 885                 }
 886         } else {
 887                 listen_sockets = 0;
 888                 config_t *cfg = lookup_config(config_tree, "BindToAddress");
 889
 890                 do {
 891                         get_config_string(cfg, &address);
 892                         if(cfg)
 893                                 cfg = lookup_config_next(config_tree, cfg);
 894
 895                         char *port = myport;
 896
 897                         if(address) {
 898                                 char *space = strchr(address, ' ');
 899                                 if(space) {
 900                                         *space++ = 0;
 901                                         port = space;
 902                                 }
 903
 904                                 if(!strcmp(address, "*"))
 905                                         *address = 0;
 906                         }
 907
 908                         struct addrinfo *ai, hint = {0};
 909                         hint.ai_family = addressfamily;
 910                         hint.ai_socktype = SOCK_STREAM;
 911                         hint.ai_protocol = IPPROTO_TCP;
 912                         hint.ai_flags = AI_PASSIVE;
 913
 914                         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 915                         free(address);
 916
 917                         if(err || !ai) {
 918                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
 919                                            gai_strerror(err));
 920                                 return false;
 921                         }
 922
 923                         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 924                                 if(listen_sockets >= MAXSOCKETS) {
 925                                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 926                                         return false;
 927                                 }
 928
 929                                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 930
 931                                 if(tcp_fd < 0)
 932                                         continue;
 933
 934                                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 935
 936                                 if(tcp_fd < 0) {
 937                                         close(tcp_fd);
 938                                         continue;
 939                                 }
 940
 941                                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 942                                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 943
 944                                 if(debug_level >= DEBUG_CONNECTIONS) {
 945                                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 946                                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 947                                         free(hostname);
 948                                 }
 949
 950                                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 951                                 listen_sockets++;
 952                         }
 953
 954                         freeaddrinfo(ai);
 955                 } while(cfg);
 956         }
 957
 958         if(listen_sockets)
 959                 logger(DEBUG_ALWAYS, LOG_NOTICE, "Ready");
 960         else {
 961                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
 962                 return false;
 963         }
 964
 965         last_config_check = now.tv_sec;
 966
 967         return true;
 968 }
 969
 970 /*
 971   initialize network
 972 */
 973 bool setup_network(void) {
 974         init_connections();
 975         init_subnets();
 976         init_nodes();
 977         init_edges();
 978         init_requests();
 979
 980         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 981                 if(pinginterval < 1) {
 982                         pinginterval = 86400;
 983                 }
 984         } else
 985                 pinginterval = 60;
 986
 987         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 988                 pingtimeout = 5;
 989         if(pingtimeout < 1 || pingtimeout > pinginterval)
 990                 pingtimeout = pinginterval;
 991
 992         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 993                 maxoutbufsize = 10 * MTU;
 994
 995         if(!setup_myself())
 996                 return false;
 997
 998         return true;
 999 }
1000
1001 /*
1002   close all open network connections
1003 */
1004 void close_network_connections(void) {
1005         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1006                 next = node->next;
1007                 connection_t *c = node->data;
1008                 /* Keep control connections open until the end, so they know when we really terminated */
1009                 if(c->status.control)
1010                         c->socket = -1;
1011                 c->outgoing = NULL;
1012                 terminate_connection(c, false);
1013         }
1014
1015         list_delete_list(outgoing_list);
1016
1017         if(myself && myself->connection) {
1018                 subnet_update(myself, NULL, false);
1019                 terminate_connection(myself->connection, false);
1020                 free_connection(myself->connection);
1021         }
1022
1023         for(int i = 0; i < listen_sockets; i++) {
1024                 io_del(&listen_socket[i].tcp);
1025                 io_del(&listen_socket[i].udp);
1026                 close(listen_socket[i].tcp.fd);
1027                 close(listen_socket[i].udp.fd);
1028         }
1029
1030 #ifndef HAVE_MINGW
1031         io_del(&unix_socket);
1032         close(unix_socket.fd);
1033 #endif
1034
1035         char *envp[5];
1036         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
1037         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
1038         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
1039         xasprintf(&envp[3], "NAME=%s", myself->name);
1040         envp[4] = NULL;
1041
1042         exit_requests();
1043         exit_edges();
1044         exit_subnets();
1045         exit_nodes();
1046         exit_connections();
1047
1048         execute_script("tinc-down", envp);
1049
1050         if(myport) free(myport);
1051
1052         for(int i = 0; i < 4; i++)
1053                 free(envp[i]);
1054
1055         devops.close();
1056
1057         return;
1058 }