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         if(!c->config_tree) {
 114                 init_configuration(&c->config_tree);
 115                 if(!read_host_config(c->config_tree, c->name))
 116                         return false;
 117         }
 118
 119         /* First, check for simple ECDSAPublicKey statement */
 120
 121         if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
 122                 c->ecdsa = ecdsa_set_base64_public_key(p);
 123                 free(p);
 124                 return c->ecdsa;
 125         }
 126
 127         /* Else, check for ECDSAPublicKeyFile statement and read it */
 128
 129         if(!get_config_string(lookup_config(c->config_tree, "ECDSAPublicKeyFile"), &fname))
 130                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 131
 132         fp = fopen(fname, "r");
 133
 134         if(!fp) {
 135                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s",
 136                            fname, strerror(errno));
 137                 free(fname);
 138                 return false;
 139         }
 140
 141         c->ecdsa = ecdsa_read_pem_public_key(fp);
 142         fclose(fp);
 143
 144         if(!c->ecdsa)
 145                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing ECDSA public key file `%s' failed.", fname);
 146         free(fname);
 147         return c->ecdsa;
 148 }
 149
 150 bool read_rsa_public_key(connection_t *c) {
 151         if(ecdsa_active(c->ecdsa))
 152                 return true;
 153
 154         FILE *fp;
 155         char *fname;
 156         char *n;
 157
 158         /* First, check for simple PublicKey statement */
 159
 160         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 161                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 162                 free(n);
 163                 return c->rsa;
 164         }
 165
 166         /* Else, check for PublicKeyFile statement and read it */
 167
 168         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 169                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 170
 171         fp = fopen(fname, "r");
 172
 173         if(!fp) {
 174                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 175                 free(fname);
 176                 return false;
 177         }
 178
 179         c->rsa = rsa_read_pem_public_key(fp);
 180         fclose(fp);
 181
 182         if(!c->rsa)
 183                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 184         free(fname);
 185         return c->rsa;
 186 }
 187
 188 static bool read_ecdsa_private_key(void) {
 189         FILE *fp;
 190         char *fname;
 191
 192         /* Check for PrivateKeyFile statement and read it */
 193
 194         if(!get_config_string(lookup_config(config_tree, "ECDSAPrivateKeyFile"), &fname))
 195                 xasprintf(&fname, "%s" SLASH "ecdsa_key.priv", confbase);
 196
 197         fp = fopen(fname, "r");
 198
 199         if(!fp) {
 200                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA private key file `%s': %s", fname, strerror(errno));
 201                 if(errno == ENOENT)
 202                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an ECDSA keypair with `tinc -n %s generate-ecdsa-keys'.", netname ?: ".");
 203                 free(fname);
 204                 return false;
 205         }
 206
 207 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 208         struct stat s;
 209
 210         if(fstat(fileno(fp), &s)) {
 211                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat ECDSA private key file `%s': %s'", fname, strerror(errno));
 212                 free(fname);
 213                 return false;
 214         }
 215
 216         if(s.st_mode & ~0100700)
 217                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for ECDSA private key file `%s'!", fname);
 218 #endif
 219
 220         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 221         fclose(fp);
 222
 223         if(!myself->connection->ecdsa)
 224                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 225         free(fname);
 226         return myself->connection->ecdsa;
 227 }
 228
 229 static bool read_rsa_private_key(void) {
 230         FILE *fp;
 231         char *fname;
 232         char *n, *d;
 233
 234         /* First, check for simple PrivateKey statement */
 235
 236         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 237                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 238                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 239                         free(d);
 240                         return false;
 241                 }
 242                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 243                 free(n);
 244                 free(d);
 245                 return myself->connection->rsa;
 246         }
 247
 248         /* Else, check for PrivateKeyFile statement and read it */
 249
 250         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 251                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 252
 253         fp = fopen(fname, "r");
 254
 255         if(!fp) {
 256                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 257                            fname, strerror(errno));
 258                 free(fname);
 259                 return false;
 260         }
 261
 262 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 263         struct stat s;
 264
 265         if(fstat(fileno(fp), &s)) {
 266                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 267                 free(fname);
 268                 return false;
 269         }
 270
 271         if(s.st_mode & ~0100700)
 272                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 273 #endif
 274
 275         myself->connection->rsa = rsa_read_pem_private_key(fp);
 276         fclose(fp);
 277
 278         if(!myself->connection->rsa)
 279                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 280         free(fname);
 281         return myself->connection->rsa;
 282 }
 283
 284 static timeout_t keyexpire_timeout;
 285
 286 static void keyexpire_handler(void *data) {
 287         regenerate_key();
 288         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 289 }
 290
 291 void regenerate_key(void) {
 292         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 293         send_key_changed();
 294 }
 295
 296 /*
 297   Read Subnets from all host config files
 298 */
 299 void load_all_subnets(void) {
 300         DIR *dir;
 301         struct dirent *ent;
 302         char *dname;
 303
 304         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 305         dir = opendir(dname);
 306         if(!dir) {
 307                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 308                 free(dname);
 309                 return;
 310         }
 311
 312         while((ent = readdir(dir))) {
 313                 if(!check_id(ent->d_name))
 314                         continue;
 315
 316                 node_t *n = lookup_node(ent->d_name);
 317                 #ifdef _DIRENT_HAVE_D_TYPE
 318                 //if(ent->d_type != DT_REG)
 319                 //      continue;
 320                 #endif
 321
 322                 char *fname;
 323                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, ent->d_name);
 324
 325                 splay_tree_t *config_tree;
 326                 init_configuration(&config_tree);
 327                 read_config_options(config_tree, ent->d_name);
 328                 read_config_file(config_tree, fname);
 329                 free(fname);
 330
 331                 if(!n) {
 332                         n = new_node();
 333                         n->name = xstrdup(ent->d_name);
 334                         node_add(n);
 335                 }
 336
 337                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 338                         subnet_t *s, *s2;
 339
 340                         if(!get_config_subnet(cfg, &s))
 341                                 continue;
 342
 343                         if((s2 = lookup_subnet(n, s))) {
 344                                 s2->expires = -1;
 345                         } else {
 346                                 subnet_add(n, s);
 347                         }
 348                 }
 349
 350                 exit_configuration(&config_tree);
 351         }
 352
 353         closedir(dir);
 354 }
 355
 356 void load_all_nodes(void) {
 357         DIR *dir;
 358         struct dirent *ent;
 359         char *dname;
 360
 361         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 362         dir = opendir(dname);
 363         if(!dir) {
 364                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 365                 free(dname);
 366                 return;
 367         }
 368
 369         while((ent = readdir(dir))) {
 370                 if(!check_id(ent->d_name))
 371                         continue;
 372
 373                 node_t *n = lookup_node(ent->d_name);
 374                 if(n)
 375                         continue;
 376
 377                 n = new_node();
 378                 n->name = xstrdup(ent->d_name);
 379                 node_add(n);
 380         }
 381
 382         closedir(dir);
 383 }
 384
 385
 386 char *get_name(void) {
 387         char *name = NULL;
 388
 389         get_config_string(lookup_config(config_tree, "Name"), &name);
 390
 391         if(!name)
 392                 return NULL;
 393
 394         if(*name == '$') {
 395                 char *envname = getenv(name + 1);
 396                 if(!envname) {
 397                         if(strcmp(name + 1, "HOST")) {
 398                                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1);
 399                                 return false;
 400                         }
 401                         char envname[32];
 402                         if(gethostname(envname, 32)) {
 403                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", strerror(errno));
 404                                 return false;
 405                         }
 406                         envname[31] = 0;
 407                 }
 408                 free(name);
 409                 name = xstrdup(envname);
 410                 for(char *c = name; *c; c++)
 411                         if(!isalnum(*c))
 412                                 *c = '_';
 413         }
 414
 415         if(!check_id(name)) {
 416                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
 417                 free(name);
 418                 return false;
 419         }
 420
 421         return name;
 422 }
 423
 424 bool setup_myself_reloadable(void) {
 425         char *proxy = NULL;
 426         char *rmode = NULL;
 427         char *fmode = NULL;
 428         char *bmode = NULL;
 429         char *afname = NULL;
 430         char *space;
 431         bool choice;
 432
 433         free(scriptinterpreter);
 434         scriptinterpreter = NULL;
 435         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 436
 437
 438         free(scriptextension);
 439         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 440 #ifdef HAVE_MINGW
 441                 scriptextension = xstrdup(".bat");
 442 #else
 443                 scriptextension = xstrdup("");
 444 #endif
 445
 446         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 447         if(proxy) {
 448                 if((space = strchr(proxy, ' ')))
 449                         *space++ = 0;
 450
 451                 if(!strcasecmp(proxy, "none")) {
 452                         proxytype = PROXY_NONE;
 453                 } else if(!strcasecmp(proxy, "socks4")) {
 454                         proxytype = PROXY_SOCKS4;
 455                 } else if(!strcasecmp(proxy, "socks4a")) {
 456                         proxytype = PROXY_SOCKS4A;
 457                 } else if(!strcasecmp(proxy, "socks5")) {
 458                         proxytype = PROXY_SOCKS5;
 459                 } else if(!strcasecmp(proxy, "http")) {
 460                         proxytype = PROXY_HTTP;
 461                 } else if(!strcasecmp(proxy, "exec")) {
 462                         proxytype = PROXY_EXEC;
 463                 } else {
 464                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 465                         return false;
 466                 }
 467
 468                 switch(proxytype) {
 469                         case PROXY_NONE:
 470                         default:
 471                                 break;
 472
 473                         case PROXY_EXEC:
 474                                 if(!space || !*space) {
 475                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 476                                         return false;
 477                                 }
 478                                 proxyhost =  xstrdup(space);
 479                                 break;
 480
 481                         case PROXY_SOCKS4:
 482                         case PROXY_SOCKS4A:
 483                         case PROXY_SOCKS5:
 484                         case PROXY_HTTP:
 485                                 proxyhost = space;
 486                                 if(space && (space = strchr(space, ' ')))
 487                                         *space++ = 0, proxyport = space;
 488                                 if(space && (space = strchr(space, ' ')))
 489                                         *space++ = 0, proxyuser = space;
 490                                 if(space && (space = strchr(space, ' ')))
 491                                         *space++ = 0, proxypass = space;
 492                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 493                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 494                                         return false;
 495                                 }
 496                                 proxyhost = xstrdup(proxyhost);
 497                                 proxyport = xstrdup(proxyport);
 498                                 if(proxyuser && *proxyuser)
 499                                         proxyuser = xstrdup(proxyuser);
 500                                 if(proxypass && *proxypass)
 501                                         proxypass = xstrdup(proxypass);
 502                                 break;
 503                 }
 504
 505                 free(proxy);
 506         }
 507
 508         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 509                 myself->options |= OPTION_INDIRECT;
 510
 511         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 512                 myself->options |= OPTION_TCPONLY;
 513
 514         if(myself->options & OPTION_TCPONLY)
 515                 myself->options |= OPTION_INDIRECT;
 516
 517         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 518         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 519
 520         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 521                 if(!strcasecmp(rmode, "router"))
 522                         routing_mode = RMODE_ROUTER;
 523                 else if(!strcasecmp(rmode, "switch"))
 524                         routing_mode = RMODE_SWITCH;
 525                 else if(!strcasecmp(rmode, "hub"))
 526                         routing_mode = RMODE_HUB;
 527                 else {
 528                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 529                         return false;
 530                 }
 531                 free(rmode);
 532         }
 533
 534         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 535                 if(!strcasecmp(fmode, "off"))
 536                         forwarding_mode = FMODE_OFF;
 537                 else if(!strcasecmp(fmode, "internal"))
 538                         forwarding_mode = FMODE_INTERNAL;
 539                 else if(!strcasecmp(fmode, "kernel"))
 540                         forwarding_mode = FMODE_KERNEL;
 541                 else {
 542                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 543                         return false;
 544                 }
 545                 free(fmode);
 546         }
 547
 548         choice = true;
 549         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 550         if(choice)
 551                 myself->options |= OPTION_PMTU_DISCOVERY;
 552
 553         choice = true;
 554         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 555         if(choice)
 556                 myself->options |= OPTION_CLAMP_MSS;
 557
 558         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 559         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 560         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 561                 if(!strcasecmp(bmode, "no"))
 562                         broadcast_mode = BMODE_NONE;
 563                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 564                         broadcast_mode = BMODE_MST;
 565                 else if(!strcasecmp(bmode, "direct"))
 566                         broadcast_mode = BMODE_DIRECT;
 567                 else {
 568                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 569                         return false;
 570                 }
 571                 free(bmode);
 572         }
 573
 574 #if !defined(SOL_IP) || !defined(IP_TOS)
 575         if(priorityinheritance)
 576                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 577 #endif
 578
 579         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 580                 macexpire = 600;
 581
 582         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 583                 if(maxtimeout <= 0) {
 584                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 585                         return false;
 586                 }
 587         } else
 588                 maxtimeout = 900;
 589
 590         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 591                 if(!strcasecmp(afname, "IPv4"))
 592                         addressfamily = AF_INET;
 593                 else if(!strcasecmp(afname, "IPv6"))
 594                         addressfamily = AF_INET6;
 595                 else if(!strcasecmp(afname, "any"))
 596                         addressfamily = AF_UNSPEC;
 597                 else {
 598                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 599                         return false;
 600                 }
 601                 free(afname);
 602         }
 603
 604         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 605
 606         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 607                 keylifetime = 3600;
 608
 609         get_config_int(lookup_config(config_tree, "AutoConnect"), &autoconnect);
 610
 611         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 612
 613         return true;
 614 }
 615
 616 /*
 617   Configure node_t myself and set up the local sockets (listen only)
 618 */
 619 static bool setup_myself(void) {
 620         char *name, *hostname, *cipher, *digest, *type;
 621         char *fname = NULL;
 622         char *address = NULL;
 623
 624         if(!(name = get_name())) {
 625                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 626                 return false;
 627         }
 628
 629         myself = new_node();
 630         myself->connection = new_connection();
 631         myself->name = name;
 632         myself->connection->name = xstrdup(name);
 633         xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 634         read_config_options(config_tree, name);
 635         read_config_file(config_tree, fname);
 636         free(fname);
 637
 638         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 639                 myport = xstrdup("655");
 640
 641         xasprintf(&myself->hostname, "MYSELF port %s", myport);
 642         myself->connection->hostname = xstrdup(myself->hostname);
 643
 644         myself->connection->options = 0;
 645         myself->connection->protocol_major = PROT_MAJOR;
 646         myself->connection->protocol_minor = PROT_MINOR;
 647
 648         myself->options |= PROT_MINOR << 24;
 649
 650         get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental);
 651
 652         if(experimental && !read_ecdsa_private_key())
 653                 return false;
 654
 655         if(!read_rsa_private_key())
 656                 return false;
 657
 658         if(!atoi(myport)) {
 659                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 660                 sockaddr_t sa;
 661                 if(!ai || !ai->ai_addr)
 662                         return false;
 663                 free(myport);
 664                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 665                 sockaddr2str(&sa, NULL, &myport);
 666         }
 667
 668         /* Read in all the subnets specified in the host configuration file */
 669
 670         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 671                 subnet_t *subnet;
 672
 673                 if(!get_config_subnet(cfg, &subnet))
 674                         return false;
 675
 676                 subnet_add(myself, subnet);
 677         }
 678
 679         /* Check some options */
 680
 681         if(!setup_myself_reloadable())
 682                 return false;
 683
 684         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 685         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 686         strictsubnets |= tunnelserver;
 687
 688
 689
 690         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 691                 if(udp_rcvbuf <= 0) {
 692                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 693                         return false;
 694                 }
 695         }
 696
 697         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 698                 if(udp_sndbuf <= 0) {
 699                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 700                         return false;
 701                 }
 702         }
 703
 704         int replaywin_int;
 705         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 706                 if(replaywin_int < 0) {
 707                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 708                         return false;
 709                 }
 710                 replaywin = (unsigned)replaywin_int;
 711                 sptps_replaywin = replaywin;
 712         }
 713
 714         /* Generate packet encryption key */
 715
 716         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 717                 cipher = xstrdup("blowfish");
 718
 719         if(!(myself->incipher = cipher_open_by_name(cipher))) {
 720                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 721                 return false;
 722         }
 723
 724         free(cipher);
 725
 726         send_key_changed();
 727         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 728
 729         /* Check if we want to use message authentication codes... */
 730
 731         int maclength = 4;
 732         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 733
 734         if(maclength < 0) {
 735                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 736                 return false;
 737         }
 738
 739         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 740                 digest = xstrdup("sha1");
 741
 742         if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 743                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 744                 return false;
 745         }
 746
 747         free(digest);
 748
 749         /* Compression */
 750
 751         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 752                 if(myself->incompression < 0 || myself->incompression > 11) {
 753                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 754                         return false;
 755                 }
 756         } else
 757                 myself->incompression = 0;
 758
 759         myself->connection->outcompression = 0;
 760
 761         /* Done */
 762
 763         myself->nexthop = myself;
 764         myself->via = myself;
 765         myself->status.reachable = true;
 766         myself->last_state_change = now.tv_sec;
 767         myself->status.sptps = experimental;
 768         node_add(myself);
 769
 770         graph();
 771
 772         if(strictsubnets)
 773                 load_all_subnets();
 774         else if(autoconnect)
 775                 load_all_nodes();
 776
 777         /* Open device */
 778
 779         devops = os_devops;
 780
 781         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 782                 if(!strcasecmp(type, "dummy"))
 783                         devops = dummy_devops;
 784                 else if(!strcasecmp(type, "raw_socket"))
 785                         devops = raw_socket_devops;
 786                 else if(!strcasecmp(type, "multicast"))
 787                         devops = multicast_devops;
 788 #ifdef ENABLE_UML
 789                 else if(!strcasecmp(type, "uml"))
 790                         devops = uml_devops;
 791 #endif
 792 #ifdef ENABLE_VDE
 793                 else if(!strcasecmp(type, "vde"))
 794                         devops = vde_devops;
 795 #endif
 796         }
 797
 798         if(!devops.setup())
 799                 return false;
 800
 801         if(device_fd >= 0)
 802                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 803
 804         /* Run tinc-up script to further initialize the tap interface */
 805         char *envp[5];
 806         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 807         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 808         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 809         xasprintf(&envp[3], "NAME=%s", myself->name);
 810         envp[4] = NULL;
 811
 812         execute_script("tinc-up", envp);
 813
 814         for(int i = 0; i < 4; i++)
 815                 free(envp[i]);
 816
 817         /* Run subnet-up scripts for our own subnets */
 818
 819         subnet_update(myself, NULL, true);
 820
 821         /* Open sockets */
 822
 823 #ifndef HAVE_MINGW
 824         int unix_fd = socket(AF_UNIX, SOCK_STREAM, 0);
 825         if(unix_fd < 0) {
 826                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not create UNIX socket: %s", sockstrerror(errno));
 827                 return false;
 828         }
 829
 830         struct sockaddr_un sa;
 831         sa.sun_family = AF_UNIX;
 832         strncpy(sa.sun_path, unixsocketname, sizeof sa.sun_path);
 833
 834         if(connect(unix_fd, (struct sockaddr *)&sa, sizeof sa) >= 0) {
 835                 logger(DEBUG_ALWAYS, LOG_ERR, "UNIX socket %s is still in use!", unixsocketname);
 836                 return false;
 837         }
 838
 839         unlink(unixsocketname);
 840
 841         if(bind(unix_fd, (struct sockaddr *)&sa, sizeof sa) < 0) {
 842                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not bind UNIX socket to %s: %s", unixsocketname, sockstrerror(errno));
 843                 return false;
 844         }
 845
 846         if(listen(unix_fd, 3) < 0) {
 847                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not listen on UNIX socket %s: %s", unixsocketname, sockstrerror(errno));
 848                 return false;
 849         }
 850
 851         io_add(&unix_socket, handle_new_unix_connection, &unix_socket, unix_fd, IO_READ);
 852 #endif
 853
 854         if(!do_detach && getenv("LISTEN_FDS")) {
 855                 sockaddr_t sa;
 856                 socklen_t salen;
 857
 858                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 859 #ifdef HAVE_UNSETENV
 860                 unsetenv("LISTEN_FDS");
 861 #endif
 862
 863                 if(listen_sockets > MAXSOCKETS) {
 864                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 865                         return false;
 866                 }
 867
 868                 for(int i = 0; i < listen_sockets; i++) {
 869                         salen = sizeof sa;
 870                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 871                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
 872                                 return false;
 873                         }
 874
 875 #ifdef FD_CLOEXEC
 876                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 877 #endif
 878
 879                         int udp_fd = setup_vpn_in_socket(&sa);
 880                         if(udp_fd < 0)
 881                                 return false;
 882
 883                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
 884                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
 885
 886                         if(debug_level >= DEBUG_CONNECTIONS) {
 887                                 hostname = sockaddr2hostname(&sa);
 888                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 889                                 free(hostname);
 890                         }
 891
 892                         memcpy(&listen_socket[i].sa, &sa, salen);
 893                 }
 894         } else {
 895                 listen_sockets = 0;
 896                 config_t *cfg = lookup_config(config_tree, "BindToAddress");
 897
 898                 do {
 899                         get_config_string(cfg, &address);
 900                         if(cfg)
 901                                 cfg = lookup_config_next(config_tree, cfg);
 902
 903                         char *port = myport;
 904
 905                         if(address) {
 906                                 char *space = strchr(address, ' ');
 907                                 if(space) {
 908                                         *space++ = 0;
 909                                         port = space;
 910                                 }
 911
 912                                 if(!strcmp(address, "*"))
 913                                         *address = 0;
 914                         }
 915
 916                         struct addrinfo *ai, hint = {0};
 917                         hint.ai_family = addressfamily;
 918                         hint.ai_socktype = SOCK_STREAM;
 919                         hint.ai_protocol = IPPROTO_TCP;
 920                         hint.ai_flags = AI_PASSIVE;
 921
 922                         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 923                         free(address);
 924
 925                         if(err || !ai) {
 926                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
 927                                            gai_strerror(err));
 928                                 return false;
 929                         }
 930
 931                         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 932                                 if(listen_sockets >= MAXSOCKETS) {
 933                                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 934                                         return false;
 935                                 }
 936
 937                                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 938
 939                                 if(tcp_fd < 0)
 940                                         continue;
 941
 942                                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 943
 944                                 if(tcp_fd < 0) {
 945                                         close(tcp_fd);
 946                                         continue;
 947                                 }
 948
 949                                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 950                                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 951
 952                                 if(debug_level >= DEBUG_CONNECTIONS) {
 953                                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 954                                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 955                                         free(hostname);
 956                                 }
 957
 958                                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 959                                 listen_sockets++;
 960                         }
 961
 962                         freeaddrinfo(ai);
 963                 } while(cfg);
 964         }
 965
 966         if(listen_sockets)
 967                 logger(DEBUG_ALWAYS, LOG_NOTICE, "Ready");
 968         else {
 969                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
 970                 return false;
 971         }
 972
 973         last_config_check = now.tv_sec;
 974
 975         return true;
 976 }
 977
 978 /*
 979   initialize network
 980 */
 981 bool setup_network(void) {
 982         init_connections();
 983         init_subnets();
 984         init_nodes();
 985         init_edges();
 986         init_requests();
 987
 988         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 989                 if(pinginterval < 1) {
 990                         pinginterval = 86400;
 991                 }
 992         } else
 993                 pinginterval = 60;
 994
 995         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 996                 pingtimeout = 5;
 997         if(pingtimeout < 1 || pingtimeout > pinginterval)
 998                 pingtimeout = pinginterval;
 999
1000         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
1001                 maxoutbufsize = 10 * MTU;
1002
1003         if(!setup_myself())
1004                 return false;
1005
1006         return true;
1007 }
1008
1009 /*
1010   close all open network connections
1011 */
1012 void close_network_connections(void) {
1013         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1014                 next = node->next;
1015                 connection_t *c = node->data;
1016                 /* Keep control connections open until the end, so they know when we really terminated */
1017                 if(c->status.control)
1018                         c->socket = -1;
1019                 c->outgoing = NULL;
1020                 terminate_connection(c, false);
1021         }
1022
1023         list_delete_list(outgoing_list);
1024
1025         if(myself && myself->connection) {
1026                 subnet_update(myself, NULL, false);
1027                 terminate_connection(myself->connection, false);
1028                 free_connection(myself->connection);
1029         }
1030
1031         for(int i = 0; i < listen_sockets; i++) {
1032                 io_del(&listen_socket[i].tcp);
1033                 io_del(&listen_socket[i].udp);
1034                 close(listen_socket[i].tcp.fd);
1035                 close(listen_socket[i].udp.fd);
1036         }
1037
1038 #ifndef HAVE_MINGW
1039         io_del(&unix_socket);
1040         close(unix_socket.fd);
1041 #endif
1042
1043         char *envp[5];
1044         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
1045         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
1046         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
1047         xasprintf(&envp[3], "NAME=%s", myself->name);
1048         envp[4] = NULL;
1049
1050         exit_requests();
1051         exit_edges();
1052         exit_subnets();
1053         exit_nodes();
1054         exit_connections();
1055
1056         execute_script("tinc-down", envp);
1057
1058         if(myport) free(myport);
1059
1060         for(int i = 0; i < 4; i++)
1061                 free(envp[i]);
1062
1063         devops.close();
1064
1065         return;
1066 }