release/src/router/tinc/src/net_setup.c

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2014 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 "script.h"
  42 #include "subnet.h"
  43 #include "utils.h"
  44 #include "xalloc.h"
  45
  46 char *myport;
  47 static io_t device_io;
  48 devops_t devops;
  49
  50 char *proxyhost;
  51 char *proxyport;
  52 char *proxyuser;
  53 char *proxypass;
  54 proxytype_t proxytype;
  55 int autoconnect;
  56 bool disablebuggypeers;
  57
  58 char *scriptinterpreter;
  59 char *scriptextension;
  60
  61 bool node_read_ecdsa_public_key(node_t *n) {
  62         if(ecdsa_active(n->ecdsa))
  63                 return true;
  64
  65         splay_tree_t *config_tree;
  66         FILE *fp;
  67         char *pubname = NULL;
  68         char *p;
  69
  70         init_configuration(&config_tree);
  71         if(!read_host_config(config_tree, n->name))
  72                 goto exit;
  73
  74         /* First, check for simple ECDSAPublicKey statement */
  75
  76         if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
  77                 n->ecdsa = ecdsa_set_base64_public_key(p);
  78                 free(p);
  79                 goto exit;
  80         }
  81
  82         /* Else, check for ECDSAPublicKeyFile statement and read it */
  83
  84         if(!get_config_string(lookup_config(config_tree, "ECDSAPublicKeyFile"), &pubname))
  85                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  86
  87         fp = fopen(pubname, "r");
  88
  89         if(!fp)
  90                 goto exit;
  91
  92         n->ecdsa = ecdsa_read_pem_public_key(fp);
  93         fclose(fp);
  94
  95 exit:
  96         exit_configuration(&config_tree);
  97         free(pubname);
  98         return n->ecdsa;
  99 }
 100
 101 bool read_ecdsa_public_key(connection_t *c) {
 102         if(ecdsa_active(c->ecdsa))
 103                 return true;
 104
 105         FILE *fp;
 106         char *fname;
 107         char *p;
 108
 109         if(!c->config_tree) {
 110                 init_configuration(&c->config_tree);
 111                 if(!read_host_config(c->config_tree, c->name))
 112                         return false;
 113         }
 114
 115         /* First, check for simple ECDSAPublicKey statement */
 116
 117         if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
 118                 c->ecdsa = ecdsa_set_base64_public_key(p);
 119                 free(p);
 120                 return c->ecdsa;
 121         }
 122
 123         /* Else, check for ECDSAPublicKeyFile statement and read it */
 124
 125         if(!get_config_string(lookup_config(c->config_tree, "ECDSAPublicKeyFile"), &fname))
 126                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 127
 128         fp = fopen(fname, "r");
 129
 130         if(!fp) {
 131                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s",
 132                            fname, strerror(errno));
 133                 free(fname);
 134                 return false;
 135         }
 136
 137         c->ecdsa = ecdsa_read_pem_public_key(fp);
 138         fclose(fp);
 139
 140         if(!c->ecdsa)
 141                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing ECDSA public key file `%s' failed.", fname);
 142         free(fname);
 143         return c->ecdsa;
 144 }
 145
 146 bool read_rsa_public_key(connection_t *c) {
 147         if(ecdsa_active(c->ecdsa))
 148                 return true;
 149
 150         FILE *fp;
 151         char *fname;
 152         char *n;
 153
 154         /* First, check for simple PublicKey statement */
 155
 156         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 157                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 158                 free(n);
 159                 return c->rsa;
 160         }
 161
 162         /* Else, check for PublicKeyFile statement and read it */
 163
 164         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 165                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 166
 167         fp = fopen(fname, "r");
 168
 169         if(!fp) {
 170                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 171                 free(fname);
 172                 return false;
 173         }
 174
 175         c->rsa = rsa_read_pem_public_key(fp);
 176         fclose(fp);
 177
 178         if(!c->rsa)
 179                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 180         free(fname);
 181         return c->rsa;
 182 }
 183
 184 static bool read_ecdsa_private_key(void) {
 185         FILE *fp;
 186         char *fname;
 187
 188         /* Check for PrivateKeyFile statement and read it */
 189
 190         if(!get_config_string(lookup_config(config_tree, "ECDSAPrivateKeyFile"), &fname))
 191                 xasprintf(&fname, "%s" SLASH "ecdsa_key.priv", confbase);
 192
 193         fp = fopen(fname, "r");
 194
 195         if(!fp) {
 196                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA private key file `%s': %s", fname, strerror(errno));
 197                 if(errno == ENOENT)
 198                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an ECDSA keypair with `tinc -n %s generate-ecdsa-keys'.", netname ?: ".");
 199                 free(fname);
 200                 return false;
 201         }
 202
 203 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 204         struct stat s;
 205
 206         if(fstat(fileno(fp), &s)) {
 207                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat ECDSA private key file `%s': %s'", fname, strerror(errno));
 208                 free(fname);
 209                 return false;
 210         }
 211
 212         if(s.st_mode & ~0100700)
 213                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for ECDSA private key file `%s'!", fname);
 214 #endif
 215
 216         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 217         fclose(fp);
 218
 219         if(!myself->connection->ecdsa)
 220                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 221         free(fname);
 222         return myself->connection->ecdsa;
 223 }
 224
 225 static bool read_invitation_key(void) {
 226         FILE *fp;
 227         char *fname;
 228
 229         if(invitation_key) {
 230                 ecdsa_free(invitation_key);
 231                 invitation_key = NULL;
 232         }
 233
 234         xasprintf(&fname, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", confbase);
 235
 236         fp = fopen(fname, "r");
 237
 238         if(fp) {
 239                 invitation_key = ecdsa_read_pem_private_key(fp);
 240                 fclose(fp);
 241                 if(!invitation_key)
 242                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 243         }
 244
 245         free(fname);
 246         return invitation_key;
 247 }
 248
 249 static bool read_rsa_private_key(void) {
 250         FILE *fp;
 251         char *fname;
 252         char *n, *d;
 253
 254         /* First, check for simple PrivateKey statement */
 255
 256         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 257                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 258                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 259                         free(d);
 260                         return false;
 261                 }
 262                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 263                 free(n);
 264                 free(d);
 265                 return myself->connection->rsa;
 266         }
 267
 268         /* Else, check for PrivateKeyFile statement and read it */
 269
 270         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 271                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 272
 273         fp = fopen(fname, "r");
 274
 275         if(!fp) {
 276                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 277                            fname, strerror(errno));
 278                 free(fname);
 279                 return false;
 280         }
 281
 282 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 283         struct stat s;
 284
 285         if(fstat(fileno(fp), &s)) {
 286                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 287                 free(fname);
 288                 return false;
 289         }
 290
 291         if(s.st_mode & ~0100700)
 292                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 293 #endif
 294
 295         myself->connection->rsa = rsa_read_pem_private_key(fp);
 296         fclose(fp);
 297
 298         if(!myself->connection->rsa)
 299                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 300         free(fname);
 301         return myself->connection->rsa;
 302 }
 303
 304 static timeout_t keyexpire_timeout;
 305
 306 static void keyexpire_handler(void *data) {
 307         regenerate_key();
 308         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 309 }
 310
 311 void regenerate_key(void) {
 312         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 313         send_key_changed();
 314 }
 315
 316 /*
 317   Read Subnets from all host config files
 318 */
 319 void load_all_subnets(void) {
 320         DIR *dir;
 321         struct dirent *ent;
 322         char *dname;
 323
 324         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 325         dir = opendir(dname);
 326         if(!dir) {
 327                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 328                 free(dname);
 329                 return;
 330         }
 331
 332         while((ent = readdir(dir))) {
 333                 if(!check_id(ent->d_name))
 334                         continue;
 335
 336                 node_t *n = lookup_node(ent->d_name);
 337                 #ifdef _DIRENT_HAVE_D_TYPE
 338                 //if(ent->d_type != DT_REG)
 339                 //      continue;
 340                 #endif
 341
 342                 splay_tree_t *config_tree;
 343                 init_configuration(&config_tree);
 344                 read_config_options(config_tree, ent->d_name);
 345                 read_host_config(config_tree, ent->d_name);
 346
 347                 if(!n) {
 348                         n = new_node();
 349                         n->name = xstrdup(ent->d_name);
 350                         node_add(n);
 351                 }
 352
 353                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 354                         subnet_t *s, *s2;
 355
 356                         if(!get_config_subnet(cfg, &s))
 357                                 continue;
 358
 359                         if((s2 = lookup_subnet(n, s))) {
 360                                 s2->expires = -1;
 361                         } else {
 362                                 subnet_add(n, s);
 363                         }
 364                 }
 365
 366                 exit_configuration(&config_tree);
 367         }
 368
 369         closedir(dir);
 370 }
 371
 372 void load_all_nodes(void) {
 373         DIR *dir;
 374         struct dirent *ent;
 375         char *dname;
 376
 377         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 378         dir = opendir(dname);
 379         if(!dir) {
 380                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 381                 free(dname);
 382                 return;
 383         }
 384
 385         while((ent = readdir(dir))) {
 386                 if(!check_id(ent->d_name))
 387                         continue;
 388
 389                 node_t *n = lookup_node(ent->d_name);
 390                 if(n)
 391                         continue;
 392
 393                 n = new_node();
 394                 n->name = xstrdup(ent->d_name);
 395                 node_add(n);
 396         }
 397
 398         closedir(dir);
 399 }
 400
 401
 402 char *get_name(void) {
 403         char *name = NULL;
 404
 405         get_config_string(lookup_config(config_tree, "Name"), &name);
 406
 407         if(!name)
 408                 return NULL;
 409
 410         if(*name == '$') {
 411                 char *envname = getenv(name + 1);
 412                 char hostname[32] = "";
 413                 if(!envname) {
 414                         if(strcmp(name + 1, "HOST")) {
 415                                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1);
 416                                 return false;
 417                         }
 418                         if(gethostname(hostname, sizeof hostname) || !*hostname) {
 419                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", strerror(errno));
 420                                 return false;
 421                         }
 422                         hostname[31] = 0;
 423                         envname = hostname;
 424                 }
 425                 free(name);
 426                 name = xstrdup(envname);
 427                 for(char *c = name; *c; c++)
 428                         if(!isalnum(*c))
 429                                 *c = '_';
 430         }
 431
 432         if(!check_id(name)) {
 433                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
 434                 free(name);
 435                 return false;
 436         }
 437
 438         return name;
 439 }
 440
 441 bool setup_myself_reloadable(void) {
 442         char *proxy = NULL;
 443         char *rmode = NULL;
 444         char *fmode = NULL;
 445         char *bmode = NULL;
 446         char *afname = NULL;
 447         char *address = NULL;
 448         char *space;
 449         bool choice;
 450
 451         free(scriptinterpreter);
 452         scriptinterpreter = NULL;
 453         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 454
 455
 456         free(scriptextension);
 457         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 458                 scriptextension = xstrdup("");
 459
 460         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 461         if(proxy) {
 462                 if((space = strchr(proxy, ' ')))
 463                         *space++ = 0;
 464
 465                 if(!strcasecmp(proxy, "none")) {
 466                         proxytype = PROXY_NONE;
 467                 } else if(!strcasecmp(proxy, "socks4")) {
 468                         proxytype = PROXY_SOCKS4;
 469                 } else if(!strcasecmp(proxy, "socks4a")) {
 470                         proxytype = PROXY_SOCKS4A;
 471                 } else if(!strcasecmp(proxy, "socks5")) {
 472                         proxytype = PROXY_SOCKS5;
 473                 } else if(!strcasecmp(proxy, "http")) {
 474                         proxytype = PROXY_HTTP;
 475                 } else if(!strcasecmp(proxy, "exec")) {
 476                         proxytype = PROXY_EXEC;
 477                 } else {
 478                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 479                         return false;
 480                 }
 481
 482                 switch(proxytype) {
 483                         case PROXY_NONE:
 484                         default:
 485                                 break;
 486
 487                         case PROXY_EXEC:
 488                                 if(!space || !*space) {
 489                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 490                                         return false;
 491                                 }
 492                                 proxyhost =  xstrdup(space);
 493                                 break;
 494
 495                         case PROXY_SOCKS4:
 496                         case PROXY_SOCKS4A:
 497                         case PROXY_SOCKS5:
 498                         case PROXY_HTTP:
 499                                 proxyhost = space;
 500                                 if(space && (space = strchr(space, ' ')))
 501                                         *space++ = 0, proxyport = space;
 502                                 if(space && (space = strchr(space, ' ')))
 503                                         *space++ = 0, proxyuser = space;
 504                                 if(space && (space = strchr(space, ' ')))
 505                                         *space++ = 0, proxypass = space;
 506                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 507                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 508                                         return false;
 509                                 }
 510                                 proxyhost = xstrdup(proxyhost);
 511                                 proxyport = xstrdup(proxyport);
 512                                 if(proxyuser && *proxyuser)
 513                                         proxyuser = xstrdup(proxyuser);
 514                                 if(proxypass && *proxypass)
 515                                         proxypass = xstrdup(proxypass);
 516                                 break;
 517                 }
 518
 519                 free(proxy);
 520         }
 521
 522         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 523                 myself->options |= OPTION_INDIRECT;
 524
 525         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 526                 myself->options |= OPTION_TCPONLY;
 527
 528         if(myself->options & OPTION_TCPONLY)
 529                 myself->options |= OPTION_INDIRECT;
 530
 531         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 532         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 533
 534         memset(&localdiscovery_address, 0, sizeof localdiscovery_address);
 535         if(get_config_string(lookup_config(config_tree, "LocalDiscoveryAddress"), &address)) {
 536                 struct addrinfo *ai = str2addrinfo(address, myport, SOCK_DGRAM);
 537                 free(address);
 538                 if(!ai)
 539                         return false;
 540                 memcpy(&localdiscovery_address, ai->ai_addr, ai->ai_addrlen);
 541         }
 542
 543
 544         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 545                 if(!strcasecmp(rmode, "router"))
 546                         routing_mode = RMODE_ROUTER;
 547                 else if(!strcasecmp(rmode, "switch"))
 548                         routing_mode = RMODE_SWITCH;
 549                 else if(!strcasecmp(rmode, "hub"))
 550                         routing_mode = RMODE_HUB;
 551                 else {
 552                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 553                         return false;
 554                 }
 555                 free(rmode);
 556         }
 557
 558         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 559                 if(!strcasecmp(fmode, "off"))
 560                         forwarding_mode = FMODE_OFF;
 561                 else if(!strcasecmp(fmode, "internal"))
 562                         forwarding_mode = FMODE_INTERNAL;
 563                 else if(!strcasecmp(fmode, "kernel"))
 564                         forwarding_mode = FMODE_KERNEL;
 565                 else {
 566                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 567                         return false;
 568                 }
 569                 free(fmode);
 570         }
 571
 572         choice = true;
 573         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 574         if(choice)
 575                 myself->options |= OPTION_PMTU_DISCOVERY;
 576
 577         choice = true;
 578         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 579         if(choice)
 580                 myself->options |= OPTION_CLAMP_MSS;
 581
 582         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 583         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 584         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 585                 if(!strcasecmp(bmode, "no"))
 586                         broadcast_mode = BMODE_NONE;
 587                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 588                         broadcast_mode = BMODE_MST;
 589                 else if(!strcasecmp(bmode, "direct"))
 590                         broadcast_mode = BMODE_DIRECT;
 591                 else {
 592                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 593                         return false;
 594                 }
 595                 free(bmode);
 596         }
 597
 598 #if !defined(SOL_IP) || !defined(IP_TOS)
 599         if(priorityinheritance)
 600                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 601 #endif
 602
 603         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 604                 macexpire = 600;
 605
 606         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 607                 if(maxtimeout <= 0) {
 608                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 609                         return false;
 610                 }
 611         } else
 612                 maxtimeout = 900;
 613
 614         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 615                 if(!strcasecmp(afname, "IPv4"))
 616                         addressfamily = AF_INET;
 617                 else if(!strcasecmp(afname, "IPv6"))
 618                         addressfamily = AF_INET6;
 619                 else if(!strcasecmp(afname, "any"))
 620                         addressfamily = AF_UNSPEC;
 621                 else {
 622                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 623                         return false;
 624                 }
 625                 free(afname);
 626         }
 627
 628         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 629
 630         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 631                 keylifetime = 3600;
 632
 633         get_config_int(lookup_config(config_tree, "AutoConnect"), &autoconnect);
 634         if(autoconnect < 0)
 635                 autoconnect = 0;
 636
 637         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 638
 639         read_invitation_key();
 640
 641         return true;
 642 }
 643
 644 /*
 645   Add listening sockets.
 646 */
 647 static bool add_listen_address(char *address, bool bindto) {
 648         char *port = myport;
 649
 650         if(address) {
 651                 char *space = strchr(address, ' ');
 652                 if(space) {
 653                         *space++ = 0;
 654                         port = space;
 655                 }
 656
 657                 if(!strcmp(address, "*"))
 658                         *address = 0;
 659         }
 660
 661         struct addrinfo *ai, hint = {0};
 662         hint.ai_family = addressfamily;
 663         hint.ai_socktype = SOCK_STREAM;
 664         hint.ai_protocol = IPPROTO_TCP;
 665         hint.ai_flags = AI_PASSIVE;
 666
 667         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 668         free(address);
 669
 670         if(err || !ai) {
 671                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 672                 return false;
 673         }
 674
 675         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 676                 // Ignore duplicate addresses
 677                 bool found = false;
 678
 679                 for(int i = 0; i < listen_sockets; i++)
 680                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 681                                 found = true;
 682                                 break;
 683                         }
 684
 685                 if(found)
 686                         continue;
 687
 688                 if(listen_sockets >= MAXSOCKETS) {
 689                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 690                         return false;
 691                 }
 692
 693                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 694
 695                 if(tcp_fd < 0)
 696                         continue;
 697
 698                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 699
 700                 if(tcp_fd < 0) {
 701                         close(tcp_fd);
 702                         continue;
 703                 }
 704
 705                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 706                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 707
 708                 if(debug_level >= DEBUG_CONNECTIONS) {
 709                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 710                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 711                         free(hostname);
 712                 }
 713
 714                 listen_socket[listen_sockets].bindto = bindto;
 715                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 716                 listen_sockets++;
 717         }
 718
 719         freeaddrinfo(ai);
 720         return true;
 721 }
 722
 723 /*
 724   Configure node_t myself and set up the local sockets (listen only)
 725 */
 726 static bool setup_myself(void) {
 727         char *name, *hostname, *cipher, *digest, *type;
 728         char *address = NULL;
 729         bool port_specified = false;
 730
 731         if(!(name = get_name())) {
 732                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 733                 return false;
 734         }
 735
 736         myself = new_node();
 737         myself->connection = new_connection();
 738         myself->name = name;
 739         myself->connection->name = xstrdup(name);
 740         read_host_config(config_tree, name);
 741
 742         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 743                 myport = xstrdup("655");
 744         else
 745                 port_specified = true;
 746
 747         myself->connection->options = 0;
 748         myself->connection->protocol_major = PROT_MAJOR;
 749         myself->connection->protocol_minor = PROT_MINOR;
 750
 751         myself->options |= PROT_MINOR << 24;
 752
 753         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 754                 experimental = read_ecdsa_private_key();
 755                 if(!experimental)
 756                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 757         } else {
 758                 if(experimental && !read_ecdsa_private_key())
 759                         return false;
 760         }
 761
 762         if(!read_rsa_private_key())
 763                 return false;
 764
 765         /* Ensure myport is numeric */
 766
 767         if(!atoi(myport)) {
 768                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 769                 sockaddr_t sa;
 770                 if(!ai || !ai->ai_addr)
 771                         return false;
 772                 free(myport);
 773                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 774                 sockaddr2str(&sa, NULL, &myport);
 775         }
 776
 777         /* Read in all the subnets specified in the host configuration file */
 778
 779         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 780                 subnet_t *subnet;
 781
 782                 if(!get_config_subnet(cfg, &subnet))
 783                         return false;
 784
 785                 subnet_add(myself, subnet);
 786         }
 787
 788         /* Check some options */
 789
 790         if(!setup_myself_reloadable())
 791                 return false;
 792
 793         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 794         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 795         strictsubnets |= tunnelserver;
 796
 797         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 798                 if(max_connection_burst <= 0) {
 799                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 800                         return false;
 801                 }
 802         }
 803
 804         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 805                 if(udp_rcvbuf <= 0) {
 806                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 807                         return false;
 808                 }
 809         }
 810
 811         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 812                 if(udp_sndbuf <= 0) {
 813                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 814                         return false;
 815                 }
 816         }
 817
 818         int replaywin_int;
 819         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 820                 if(replaywin_int < 0) {
 821                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 822                         return false;
 823                 }
 824                 replaywin = (unsigned)replaywin_int;
 825                 sptps_replaywin = replaywin;
 826         }
 827
 828         /* Generate packet encryption key */
 829
 830         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 831                 cipher = xstrdup("blowfish");
 832
 833         if(!strcasecmp(cipher, "none")) {
 834                 myself->incipher = NULL;
 835         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 836                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 837                 return false;
 838         }
 839
 840         free(cipher);
 841
 842         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 843
 844         /* Check if we want to use message authentication codes... */
 845
 846         int maclength = 4;
 847         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 848
 849         if(maclength < 0) {
 850                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 851                 return false;
 852         }
 853
 854         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 855                 digest = xstrdup("sha1");
 856
 857         if(!strcasecmp(digest, "none")) {
 858                 myself->indigest = NULL;
 859         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 860                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 861                 return false;
 862         }
 863
 864         free(digest);
 865
 866         /* Compression */
 867
 868         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 869                 if(myself->incompression < 0 || myself->incompression > 11) {
 870                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 871                         return false;
 872                 }
 873         } else
 874                 myself->incompression = 0;
 875
 876         myself->connection->outcompression = 0;
 877
 878         /* Done */
 879
 880         myself->nexthop = myself;
 881         myself->via = myself;
 882         myself->status.reachable = true;
 883         myself->last_state_change = now.tv_sec;
 884         myself->status.sptps = experimental;
 885         node_add(myself);
 886
 887         graph();
 888
 889         if(strictsubnets)
 890                 load_all_subnets();
 891         else if(autoconnect)
 892                 load_all_nodes();
 893
 894         /* Open device */
 895
 896         devops = os_devops;
 897
 898         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 899                 if(!strcasecmp(type, "dummy"))
 900                         devops = dummy_devops;
 901                 else if(!strcasecmp(type, "raw_socket"))
 902                         devops = raw_socket_devops;
 903                 else if(!strcasecmp(type, "multicast"))
 904                         devops = multicast_devops;
 905 #ifdef ENABLE_UML
 906                 else if(!strcasecmp(type, "uml"))
 907                         devops = uml_devops;
 908 #endif
 909 #ifdef ENABLE_VDE
 910                 else if(!strcasecmp(type, "vde"))
 911                         devops = vde_devops;
 912 #endif
 913         }
 914
 915         if(!devops.setup())
 916                 return false;
 917
 918         if(device_fd >= 0)
 919                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 920
 921         /* Open sockets */
 922
 923         if(!do_detach && getenv("LISTEN_FDS")) {
 924                 sockaddr_t sa;
 925                 socklen_t salen;
 926
 927                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 928 #ifdef HAVE_UNSETENV
 929                 unsetenv("LISTEN_FDS");
 930 #endif
 931
 932                 if(listen_sockets > MAXSOCKETS) {
 933                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 934                         return false;
 935                 }
 936
 937                 for(int i = 0; i < listen_sockets; i++) {
 938                         salen = sizeof sa;
 939                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 940                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
 941                                 return false;
 942                         }
 943
 944 #ifdef FD_CLOEXEC
 945                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 946 #endif
 947
 948                         int udp_fd = setup_vpn_in_socket(&sa);
 949                         if(udp_fd < 0)
 950                                 return false;
 951
 952                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
 953                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
 954
 955                         if(debug_level >= DEBUG_CONNECTIONS) {
 956                                 hostname = sockaddr2hostname(&sa);
 957                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 958                                 free(hostname);
 959                         }
 960
 961                         memcpy(&listen_socket[i].sa, &sa, salen);
 962                 }
 963         } else {
 964                 listen_sockets = 0;
 965                 int cfgs = 0;
 966
 967                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 968                         cfgs++;
 969                         get_config_string(cfg, &address);
 970                         if(!add_listen_address(address, true))
 971                                 return false;
 972                 }
 973
 974                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 975                         cfgs++;
 976                         get_config_string(cfg, &address);
 977                         if(!add_listen_address(address, false))
 978                                 return false;
 979                 }
 980
 981                 if(!cfgs)
 982                         if(!add_listen_address(address, NULL))
 983                                 return false;
 984         }
 985
 986         if(!listen_sockets) {
 987                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
 988                 return false;
 989         }
 990
 991         /* If no Port option was specified, set myport to the port used by the first listening socket. */
 992
 993         if(!port_specified) {
 994                 sockaddr_t sa;
 995                 socklen_t salen = sizeof sa;
 996                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
 997                         free(myport);
 998                         sockaddr2str(&sa, NULL, &myport);
 999                         if(!myport)
1000                                 myport = xstrdup("655");
1001                 }
1002         }
1003
1004         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1005         myself->connection->hostname = xstrdup(myself->hostname);
1006
1007         /* Done. */
1008
1009         last_config_check = now.tv_sec;
1010
1011         return true;
1012 }
1013
1014 /*
1015   initialize network
1016 */
1017 bool setup_network(void) {
1018         init_connections();
1019         init_subnets();
1020         init_nodes();
1021         init_edges();
1022         init_requests();
1023
1024         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1025                 if(pinginterval < 1) {
1026                         pinginterval = 86400;
1027                 }
1028         } else
1029                 pinginterval = 60;
1030
1031         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
1032                 pingtimeout = 5;
1033         if(pingtimeout < 1 || pingtimeout > pinginterval)
1034                 pingtimeout = pinginterval;
1035
1036         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
1037                 maxoutbufsize = 10 * MTU;
1038
1039         if(!setup_myself())
1040                 return false;
1041
1042         if(!init_control())
1043                 return false;
1044
1045         /* Run tinc-up script to further initialize the tap interface */
1046
1047         char *envp[5] = {NULL};
1048         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
1049         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
1050         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
1051         xasprintf(&envp[3], "NAME=%s", myself->name);
1052
1053         execute_script("tinc-up", envp);
1054
1055         for(int i = 0; i < 4; i++)
1056                 free(envp[i]);
1057
1058         /* Run subnet-up scripts for our own subnets */
1059
1060         subnet_update(myself, NULL, true);
1061
1062         return true;
1063 }
1064
1065 /*
1066   close all open network connections
1067 */
1068 void close_network_connections(void) {
1069         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1070                 next = node->next;
1071                 connection_t *c = node->data;
1072                 /* Keep control connections open until the end, so they know when we really terminated */
1073                 if(c->status.control)
1074                         c->socket = -1;
1075                 c->outgoing = NULL;
1076                 terminate_connection(c, false);
1077         }
1078
1079         if(outgoing_list)
1080                 list_delete_list(outgoing_list);
1081
1082         if(myself && myself->connection) {
1083                 subnet_update(myself, NULL, false);
1084                 terminate_connection(myself->connection, false);
1085                 free_connection(myself->connection);
1086         }
1087
1088         for(int i = 0; i < listen_sockets; i++) {
1089                 io_del(&listen_socket[i].tcp);
1090                 io_del(&listen_socket[i].udp);
1091                 close(listen_socket[i].tcp.fd);
1092                 close(listen_socket[i].udp.fd);
1093         }
1094
1095         char *envp[5] = {NULL};
1096         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
1097         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
1098         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
1099         xasprintf(&envp[3], "NAME=%s", myself->name);
1100
1101         exit_requests();
1102         exit_edges();
1103         exit_subnets();
1104         exit_nodes();
1105         exit_connections();
1106
1107         execute_script("tinc-down", envp);
1108
1109         if(myport) free(myport);
1110
1111         for(int i = 0; i < 4; i++)
1112                 free(envp[i]);
1113
1114         devops.close();
1115
1116         exit_control();
1117
1118         return;
1119 }