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