tinc-vpn.org Git - tinc/blob - src/net_setup.c

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2014 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 char *myname;
  48 static io_t device_io;
  49 devops_t devops;
  50 bool device_standby = false;
  51
  52 char *proxyhost;
  53 char *proxyport;
  54 char *proxyuser;
  55 char *proxypass;
  56 proxytype_t proxytype;
  57 bool autoconnect;
  58 bool disablebuggypeers;
  59
  60 char *scriptinterpreter;
  61 char *scriptextension;
  62
  63 bool node_read_ecdsa_public_key(node_t *n) {
  64         if(ecdsa_active(n->ecdsa))
  65                 return true;
  66
  67         splay_tree_t *config_tree;
  68         FILE *fp;
  69         char *pubname = NULL;
  70         char *p;
  71
  72         init_configuration(&config_tree);
  73         if(!read_host_config(config_tree, n->name))
  74                 goto exit;
  75
  76         /* First, check for simple Ed25519PublicKey statement */
  77
  78         if(get_config_string(lookup_config(config_tree, "Ed25519PublicKey"), &p)) {
  79                 n->ecdsa = ecdsa_set_base64_public_key(p);
  80                 free(p);
  81                 goto exit;
  82         }
  83
  84         /* Else, check for Ed25519PublicKeyFile statement and read it */
  85
  86         if(!get_config_string(lookup_config(config_tree, "Ed25519PublicKeyFile"), &pubname))
  87                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  88
  89         fp = fopen(pubname, "r");
  90
  91         if(!fp)
  92                 goto exit;
  93
  94         n->ecdsa = ecdsa_read_pem_public_key(fp);
  95         fclose(fp);
  96
  97 exit:
  98         exit_configuration(&config_tree);
  99         free(pubname);
 100         return n->ecdsa;
 101 }
 102
 103 bool read_ecdsa_public_key(connection_t *c) {
 104         if(ecdsa_active(c->ecdsa))
 105                 return true;
 106
 107         FILE *fp;
 108         char *fname;
 109         char *p;
 110
 111         if(!c->config_tree) {
 112                 init_configuration(&c->config_tree);
 113                 if(!read_host_config(c->config_tree, c->name))
 114                         return false;
 115         }
 116
 117         /* First, check for simple Ed25519PublicKey statement */
 118
 119         if(get_config_string(lookup_config(c->config_tree, "Ed25519PublicKey"), &p)) {
 120                 c->ecdsa = ecdsa_set_base64_public_key(p);
 121                 free(p);
 122                 return c->ecdsa;
 123         }
 124
 125         /* Else, check for Ed25519PublicKeyFile statement and read it */
 126
 127         if(!get_config_string(lookup_config(c->config_tree, "Ed25519PublicKeyFile"), &fname))
 128                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 129
 130         fp = fopen(fname, "r");
 131
 132         if(!fp) {
 133                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 public key file `%s': %s",
 134                            fname, strerror(errno));
 135                 free(fname);
 136                 return false;
 137         }
 138
 139         c->ecdsa = ecdsa_read_pem_public_key(fp);
 140         fclose(fp);
 141
 142         if(!c->ecdsa)
 143                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing Ed25519 public key file `%s' failed.", fname);
 144         free(fname);
 145         return c->ecdsa;
 146 }
 147
 148 bool read_rsa_public_key(connection_t *c) {
 149         if(ecdsa_active(c->ecdsa))
 150                 return true;
 151
 152         FILE *fp;
 153         char *fname;
 154         char *n;
 155
 156         /* First, check for simple PublicKey statement */
 157
 158         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 159                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 160                 free(n);
 161                 return c->rsa;
 162         }
 163
 164         /* Else, check for PublicKeyFile statement and read it */
 165
 166         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 167                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 168
 169         fp = fopen(fname, "r");
 170
 171         if(!fp) {
 172                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 173                 free(fname);
 174                 return false;
 175         }
 176
 177         c->rsa = rsa_read_pem_public_key(fp);
 178         fclose(fp);
 179
 180         if(!c->rsa)
 181                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 182         free(fname);
 183         return c->rsa;
 184 }
 185
 186 static bool read_ecdsa_private_key(void) {
 187         FILE *fp;
 188         char *fname;
 189
 190         /* Check for PrivateKeyFile statement and read it */
 191
 192         if(!get_config_string(lookup_config(config_tree, "Ed25519PrivateKeyFile"), &fname))
 193                 xasprintf(&fname, "%s" SLASH "ed25519_key.priv", confbase);
 194
 195         fp = fopen(fname, "r");
 196
 197         if(!fp) {
 198                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 private key file `%s': %s", fname, strerror(errno));
 199                 if(errno == ENOENT)
 200                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an Ed25519 keypair with `tinc -n %s generate-ed25519-keys'.", netname ?: ".");
 201                 free(fname);
 202                 return false;
 203         }
 204
 205 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 206         struct stat s;
 207
 208         if(fstat(fileno(fp), &s)) {
 209                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat Ed25519 private key file `%s': %s'", fname, strerror(errno));
 210                 free(fname);
 211                 return false;
 212         }
 213
 214         if(s.st_mode & ~0100700)
 215                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for Ed25519 private key file `%s'!", fname);
 216 #endif
 217
 218         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 219         fclose(fp);
 220
 221         if(!myself->connection->ecdsa)
 222                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 223         free(fname);
 224         return myself->connection->ecdsa;
 225 }
 226
 227 static bool read_invitation_key(void) {
 228         FILE *fp;
 229         char *fname;
 230
 231         if(invitation_key) {
 232                 ecdsa_free(invitation_key);
 233                 invitation_key = NULL;
 234         }
 235
 236         xasprintf(&fname, "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
 237
 238         fp = fopen(fname, "r");
 239
 240         if(fp) {
 241                 invitation_key = ecdsa_read_pem_private_key(fp);
 242                 fclose(fp);
 243                 if(!invitation_key)
 244                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 245         }
 246
 247         free(fname);
 248         return invitation_key;
 249 }
 250
 251 static bool read_rsa_private_key(void) {
 252         FILE *fp;
 253         char *fname;
 254         char *n, *d;
 255
 256         /* First, check for simple PrivateKey statement */
 257
 258         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 259                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 260                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 261                         free(d);
 262                         return false;
 263                 }
 264                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 265                 free(n);
 266                 free(d);
 267                 return myself->connection->rsa;
 268         }
 269
 270         /* Else, check for PrivateKeyFile statement and read it */
 271
 272         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 273                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 274
 275         fp = fopen(fname, "r");
 276
 277         if(!fp) {
 278                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 279                            fname, strerror(errno));
 280                 free(fname);
 281                 return false;
 282         }
 283
 284 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 285         struct stat s;
 286
 287         if(fstat(fileno(fp), &s)) {
 288                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 289                 free(fname);
 290                 return false;
 291         }
 292
 293         if(s.st_mode & ~0100700)
 294                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 295 #endif
 296
 297         myself->connection->rsa = rsa_read_pem_private_key(fp);
 298         fclose(fp);
 299
 300         if(!myself->connection->rsa)
 301                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 302         free(fname);
 303         return myself->connection->rsa;
 304 }
 305
 306 static timeout_t keyexpire_timeout;
 307
 308 static void keyexpire_handler(void *data) {
 309         regenerate_key();
 310         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 311 }
 312
 313 void regenerate_key(void) {
 314         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 315         send_key_changed();
 316 }
 317
 318 /*
 319   Read Subnets from all host config files
 320 */
 321 void load_all_subnets(void) {
 322         DIR *dir;
 323         struct dirent *ent;
 324         char *dname;
 325
 326         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 327         dir = opendir(dname);
 328         if(!dir) {
 329                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 330                 free(dname);
 331                 return;
 332         }
 333
 334         while((ent = readdir(dir))) {
 335                 if(!check_id(ent->d_name))
 336                         continue;
 337
 338                 node_t *n = lookup_node(ent->d_name);
 339                 #ifdef _DIRENT_HAVE_D_TYPE
 340                 //if(ent->d_type != DT_REG)
 341                 //      continue;
 342                 #endif
 343
 344                 splay_tree_t *config_tree;
 345                 init_configuration(&config_tree);
 346                 read_config_options(config_tree, ent->d_name);
 347                 read_host_config(config_tree, ent->d_name);
 348
 349                 if(!n) {
 350                         n = new_node();
 351                         n->name = xstrdup(ent->d_name);
 352                         node_add(n);
 353                 }
 354
 355                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 356                         subnet_t *s, *s2;
 357
 358                         if(!get_config_subnet(cfg, &s))
 359                                 continue;
 360
 361                         if((s2 = lookup_subnet(n, s))) {
 362                                 s2->expires = -1;
 363                         } else {
 364                                 subnet_add(n, s);
 365                         }
 366                 }
 367
 368                 exit_configuration(&config_tree);
 369         }
 370
 371         closedir(dir);
 372 }
 373
 374 void load_all_nodes(void) {
 375         DIR *dir;
 376         struct dirent *ent;
 377         char *dname;
 378
 379         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 380         dir = opendir(dname);
 381         if(!dir) {
 382                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 383                 free(dname);
 384                 return;
 385         }
 386
 387         while((ent = readdir(dir))) {
 388                 if(!check_id(ent->d_name))
 389                         continue;
 390
 391                 node_t *n = lookup_node(ent->d_name);
 392                 if(n)
 393                         continue;
 394
 395                 n = new_node();
 396                 n->name = xstrdup(ent->d_name);
 397                 node_add(n);
 398         }
 399
 400         closedir(dir);
 401 }
 402
 403
 404 char *get_name(void) {
 405         char *name = NULL;
 406         char *returned_name;
 407
 408         get_config_string(lookup_config(config_tree, "Name"), &name);
 409
 410         if(!name)
 411                 return NULL;
 412
 413         returned_name = replace_name(name);
 414         free(name);
 415         return returned_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                 scriptextension = xstrdup("");
 435
 436         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 437         if(proxy) {
 438                 if((space = strchr(proxy, ' ')))
 439                         *space++ = 0;
 440
 441                 if(!strcasecmp(proxy, "none")) {
 442                         proxytype = PROXY_NONE;
 443                 } else if(!strcasecmp(proxy, "socks4")) {
 444                         proxytype = PROXY_SOCKS4;
 445                 } else if(!strcasecmp(proxy, "socks4a")) {
 446                         proxytype = PROXY_SOCKS4A;
 447                 } else if(!strcasecmp(proxy, "socks5")) {
 448                         proxytype = PROXY_SOCKS5;
 449                 } else if(!strcasecmp(proxy, "http")) {
 450                         proxytype = PROXY_HTTP;
 451                 } else if(!strcasecmp(proxy, "exec")) {
 452                         proxytype = PROXY_EXEC;
 453                 } else {
 454                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 455                         return false;
 456                 }
 457
 458                 switch(proxytype) {
 459                         case PROXY_NONE:
 460                         default:
 461                                 break;
 462
 463                         case PROXY_EXEC:
 464                                 if(!space || !*space) {
 465                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 466                                         return false;
 467                                 }
 468                                 proxyhost =  xstrdup(space);
 469                                 break;
 470
 471                         case PROXY_SOCKS4:
 472                         case PROXY_SOCKS4A:
 473                         case PROXY_SOCKS5:
 474                         case PROXY_HTTP:
 475                                 proxyhost = space;
 476                                 if(space && (space = strchr(space, ' ')))
 477                                         *space++ = 0, proxyport = space;
 478                                 if(space && (space = strchr(space, ' ')))
 479                                         *space++ = 0, proxyuser = space;
 480                                 if(space && (space = strchr(space, ' ')))
 481                                         *space++ = 0, proxypass = space;
 482                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 483                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 484                                         return false;
 485                                 }
 486                                 proxyhost = xstrdup(proxyhost);
 487                                 proxyport = xstrdup(proxyport);
 488                                 if(proxyuser && *proxyuser)
 489                                         proxyuser = xstrdup(proxyuser);
 490                                 if(proxypass && *proxypass)
 491                                         proxypass = xstrdup(proxypass);
 492                                 break;
 493                 }
 494
 495                 free(proxy);
 496         }
 497
 498         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 499                 myself->options |= OPTION_INDIRECT;
 500
 501         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 502                 myself->options |= OPTION_TCPONLY;
 503
 504         if(myself->options & OPTION_TCPONLY)
 505                 myself->options |= OPTION_INDIRECT;
 506
 507         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 508         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 509
 510         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 511                 if(!strcasecmp(rmode, "router"))
 512                         routing_mode = RMODE_ROUTER;
 513                 else if(!strcasecmp(rmode, "switch"))
 514                         routing_mode = RMODE_SWITCH;
 515                 else if(!strcasecmp(rmode, "hub"))
 516                         routing_mode = RMODE_HUB;
 517                 else {
 518                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 519                         return false;
 520                 }
 521                 free(rmode);
 522         }
 523
 524         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 525                 if(!strcasecmp(fmode, "off"))
 526                         forwarding_mode = FMODE_OFF;
 527                 else if(!strcasecmp(fmode, "internal"))
 528                         forwarding_mode = FMODE_INTERNAL;
 529                 else if(!strcasecmp(fmode, "kernel"))
 530                         forwarding_mode = FMODE_KERNEL;
 531                 else {
 532                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 533                         return false;
 534                 }
 535                 free(fmode);
 536         }
 537
 538         choice = true;
 539         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 540         if(choice)
 541                 myself->options |= OPTION_PMTU_DISCOVERY;
 542
 543         choice = true;
 544         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 545         if(choice)
 546                 myself->options |= OPTION_CLAMP_MSS;
 547
 548         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 549         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 550         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 551                 if(!strcasecmp(bmode, "no"))
 552                         broadcast_mode = BMODE_NONE;
 553                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 554                         broadcast_mode = BMODE_MST;
 555                 else if(!strcasecmp(bmode, "direct"))
 556                         broadcast_mode = BMODE_DIRECT;
 557                 else {
 558                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 559                         return false;
 560                 }
 561                 free(bmode);
 562         }
 563
 564         const char* const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
 565         for (size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
 566                 subnet_t *s = new_subnet();
 567                 if (!str2net(s, DEFAULT_BROADCAST_SUBNETS[i]))
 568                         abort();
 569                 subnet_add(NULL, s);
 570         }
 571         for (config_t* cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 572                 subnet_t *s;
 573                 if (!get_config_subnet(cfg, &s))
 574                         continue;
 575                 subnet_add(NULL, s);
 576         }
 577
 578 #if !defined(SOL_IP) || !defined(IP_TOS)
 579         if(priorityinheritance)
 580                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 581 #endif
 582
 583         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 584                 macexpire = 600;
 585
 586         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 587                 if(maxtimeout <= 0) {
 588                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 589                         return false;
 590                 }
 591         } else
 592                 maxtimeout = 900;
 593
 594         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 595                 if(!strcasecmp(afname, "IPv4"))
 596                         addressfamily = AF_INET;
 597                 else if(!strcasecmp(afname, "IPv6"))
 598                         addressfamily = AF_INET6;
 599                 else if(!strcasecmp(afname, "any"))
 600                         addressfamily = AF_UNSPEC;
 601                 else {
 602                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 603                         return false;
 604                 }
 605                 free(afname);
 606         }
 607
 608         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 609
 610         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 611                 keylifetime = 3600;
 612
 613         config_t *cfg = lookup_config(config_tree, "AutoConnect");
 614         if(cfg) {
 615                 if(!get_config_bool(cfg, &autoconnect)) {
 616                         // Some backwards compatibility with when this option was an int
 617                         int val = 0;
 618                         get_config_int(cfg, &val);
 619                         autoconnect = val;
 620                 }
 621         }
 622
 623         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 624
 625         read_invitation_key();
 626
 627         return true;
 628 }
 629
 630 /*
 631   Add listening sockets.
 632 */
 633 static bool add_listen_address(char *address, bool bindto) {
 634         char *port = myport;
 635
 636         if(address) {
 637                 char *space = strchr(address, ' ');
 638                 if(space) {
 639                         *space++ = 0;
 640                         port = space;
 641                 }
 642
 643                 if(!strcmp(address, "*"))
 644                         *address = 0;
 645         }
 646
 647         struct addrinfo *ai, hint = {0};
 648         hint.ai_family = addressfamily;
 649         hint.ai_socktype = SOCK_STREAM;
 650         hint.ai_protocol = IPPROTO_TCP;
 651         hint.ai_flags = AI_PASSIVE;
 652
 653         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 654         free(address);
 655
 656         if(err || !ai) {
 657                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 658                 return false;
 659         }
 660
 661         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 662                 // Ignore duplicate addresses
 663                 bool found = false;
 664
 665                 for(int i = 0; i < listen_sockets; i++)
 666                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 667                                 found = true;
 668                                 break;
 669                         }
 670
 671                 if(found)
 672                         continue;
 673
 674                 if(listen_sockets >= MAXSOCKETS) {
 675                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 676                         return false;
 677                 }
 678
 679                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 680
 681                 if(tcp_fd < 0)
 682                         continue;
 683
 684                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 685
 686                 if(tcp_fd < 0) {
 687                         close(tcp_fd);
 688                         continue;
 689                 }
 690
 691                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 692                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 693
 694                 if(debug_level >= DEBUG_CONNECTIONS) {
 695                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 696                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 697                         free(hostname);
 698                 }
 699
 700                 listen_socket[listen_sockets].bindto = bindto;
 701                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 702                 listen_sockets++;
 703         }
 704
 705         freeaddrinfo(ai);
 706         return true;
 707 }
 708
 709 void device_enable(void) {
 710         if (devops.enable)
 711                 devops.enable();
 712
 713         /* Run tinc-up script to further initialize the tap interface */
 714
 715         char *envp[5] = {NULL};
 716         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 717         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 718         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 719         xasprintf(&envp[3], "NAME=%s", myname);
 720
 721         execute_script("tinc-up", envp);
 722
 723         for(int i = 0; i < 4; i++)
 724                 free(envp[i]);
 725 }
 726
 727 void device_disable(void) {
 728         char *envp[5] = {NULL};
 729         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 730         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 731         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 732         xasprintf(&envp[3], "NAME=%s", myname);
 733
 734         execute_script("tinc-down", envp);
 735
 736         for(int i = 0; i < 4; i++)
 737                 free(envp[i]);
 738
 739         if (devops.disable)
 740                 devops.disable();
 741 }
 742
 743 /*
 744   Configure node_t myself and set up the local sockets (listen only)
 745 */
 746 static bool setup_myself(void) {
 747         char *name, *hostname, *cipher, *digest, *type;
 748         char *address = NULL;
 749         bool port_specified = false;
 750
 751         if(!(name = get_name())) {
 752                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 753                 return false;
 754         }
 755
 756         myname = xstrdup(name);
 757         myself = new_node();
 758         myself->connection = new_connection();
 759         myself->name = name;
 760         myself->connection->name = xstrdup(name);
 761         read_host_config(config_tree, name);
 762
 763         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 764                 myport = xstrdup("655");
 765         else
 766                 port_specified = true;
 767
 768         myself->connection->options = 0;
 769         myself->connection->protocol_major = PROT_MAJOR;
 770         myself->connection->protocol_minor = PROT_MINOR;
 771
 772         myself->options |= PROT_MINOR << 24;
 773
 774         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 775                 experimental = read_ecdsa_private_key();
 776                 if(!experimental)
 777                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 778         } else {
 779                 if(experimental && !read_ecdsa_private_key())
 780                         return false;
 781         }
 782
 783         if(!read_rsa_private_key())
 784                 return false;
 785
 786         /* Ensure myport is numeric */
 787
 788         if(!atoi(myport)) {
 789                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 790                 sockaddr_t sa;
 791                 if(!ai || !ai->ai_addr)
 792                         return false;
 793                 free(myport);
 794                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 795                 sockaddr2str(&sa, NULL, &myport);
 796         }
 797
 798         /* Read in all the subnets specified in the host configuration file */
 799
 800         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 801                 subnet_t *subnet;
 802
 803                 if(!get_config_subnet(cfg, &subnet))
 804                         return false;
 805
 806                 subnet_add(myself, subnet);
 807         }
 808
 809         /* Check some options */
 810
 811         if(!setup_myself_reloadable())
 812                 return false;
 813
 814         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 815         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 816         strictsubnets |= tunnelserver;
 817
 818         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 819                 if(max_connection_burst <= 0) {
 820                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 821                         return false;
 822                 }
 823         }
 824
 825         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 826                 if(udp_rcvbuf <= 0) {
 827                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 828                         return false;
 829                 }
 830         }
 831
 832         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 833                 if(udp_sndbuf <= 0) {
 834                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 835                         return false;
 836                 }
 837         }
 838
 839         int replaywin_int;
 840         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 841                 if(replaywin_int < 0) {
 842                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 843                         return false;
 844                 }
 845                 replaywin = (unsigned)replaywin_int;
 846                 sptps_replaywin = replaywin;
 847         }
 848
 849         /* Generate packet encryption key */
 850
 851         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 852                 cipher = xstrdup("blowfish");
 853
 854         if(!strcasecmp(cipher, "none")) {
 855                 myself->incipher = NULL;
 856         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 857                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 858                 return false;
 859         }
 860
 861         free(cipher);
 862
 863         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 864
 865         /* Check if we want to use message authentication codes... */
 866
 867         int maclength = 4;
 868         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 869
 870         if(maclength < 0) {
 871                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 872                 return false;
 873         }
 874
 875         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 876                 digest = xstrdup("sha1");
 877
 878         if(!strcasecmp(digest, "none")) {
 879                 myself->indigest = NULL;
 880         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 881                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 882                 return false;
 883         }
 884
 885         free(digest);
 886
 887         /* Compression */
 888
 889         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 890                 if(myself->incompression < 0 || myself->incompression > 11) {
 891                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 892                         return false;
 893                 }
 894         } else
 895                 myself->incompression = 0;
 896
 897         myself->connection->outcompression = 0;
 898
 899         /* Done */
 900
 901         myself->nexthop = myself;
 902         myself->via = myself;
 903         myself->status.reachable = true;
 904         myself->last_state_change = now.tv_sec;
 905         myself->status.sptps = experimental;
 906         node_add(myself);
 907
 908         graph();
 909
 910         if(strictsubnets)
 911                 load_all_subnets();
 912         else if(autoconnect)
 913                 load_all_nodes();
 914
 915         /* Open device */
 916
 917         devops = os_devops;
 918
 919         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 920                 if(!strcasecmp(type, "dummy"))
 921                         devops = dummy_devops;
 922                 else if(!strcasecmp(type, "raw_socket"))
 923                         devops = raw_socket_devops;
 924                 else if(!strcasecmp(type, "multicast"))
 925                         devops = multicast_devops;
 926 #ifdef ENABLE_UML
 927                 else if(!strcasecmp(type, "uml"))
 928                         devops = uml_devops;
 929 #endif
 930 #ifdef ENABLE_VDE
 931                 else if(!strcasecmp(type, "vde"))
 932                         devops = vde_devops;
 933 #endif
 934         }
 935
 936         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
 937
 938         if(!devops.setup())
 939                 return false;
 940
 941         if(device_fd >= 0)
 942                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 943
 944         /* Open sockets */
 945
 946         if(!do_detach && getenv("LISTEN_FDS")) {
 947                 sockaddr_t sa;
 948                 socklen_t salen;
 949
 950                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 951 #ifdef HAVE_UNSETENV
 952                 unsetenv("LISTEN_FDS");
 953 #endif
 954
 955                 if(listen_sockets > MAXSOCKETS) {
 956                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 957                         return false;
 958                 }
 959
 960                 for(int i = 0; i < listen_sockets; i++) {
 961                         salen = sizeof sa;
 962                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 963                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
 964                                 return false;
 965                         }
 966
 967 #ifdef FD_CLOEXEC
 968                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 969 #endif
 970
 971                         int udp_fd = setup_vpn_in_socket(&sa);
 972                         if(udp_fd < 0)
 973                                 return false;
 974
 975                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
 976                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
 977
 978                         if(debug_level >= DEBUG_CONNECTIONS) {
 979                                 hostname = sockaddr2hostname(&sa);
 980                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 981                                 free(hostname);
 982                         }
 983
 984                         memcpy(&listen_socket[i].sa, &sa, salen);
 985                 }
 986         } else {
 987                 listen_sockets = 0;
 988                 int cfgs = 0;
 989
 990                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 991                         cfgs++;
 992                         get_config_string(cfg, &address);
 993                         if(!add_listen_address(address, true))
 994                                 return false;
 995                 }
 996
 997                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 998                         cfgs++;
 999                         get_config_string(cfg, &address);
1000                         if(!add_listen_address(address, false))
1001                                 return false;
1002                 }
1003
1004                 if(!cfgs)
1005                         if(!add_listen_address(address, NULL))
1006                                 return false;
1007         }
1008
1009         if(!listen_sockets) {
1010                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1011                 return false;
1012         }
1013
1014         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1015
1016         if(!port_specified || atoi(myport) == 0) {
1017                 sockaddr_t sa;
1018                 socklen_t salen = sizeof sa;
1019                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1020                         free(myport);
1021                         sockaddr2str(&sa, NULL, &myport);
1022                         if(!myport)
1023                                 myport = xstrdup("655");
1024                 }
1025         }
1026
1027         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1028         myself->connection->hostname = xstrdup(myself->hostname);
1029
1030         /* Done. */
1031
1032         last_config_check = now.tv_sec;
1033
1034         return true;
1035 }
1036
1037 /*
1038   initialize network
1039 */
1040 bool setup_network(void) {
1041         init_connections();
1042         init_subnets();
1043         init_nodes();
1044         init_edges();
1045         init_requests();
1046
1047         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1048                 if(pinginterval < 1) {
1049                         pinginterval = 86400;
1050                 }
1051         } else
1052                 pinginterval = 60;
1053
1054         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
1055                 pingtimeout = 5;
1056         if(pingtimeout < 1 || pingtimeout > pinginterval)
1057                 pingtimeout = pinginterval;
1058
1059         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
1060                 maxoutbufsize = 10 * MTU;
1061
1062         if(!setup_myself())
1063                 return false;
1064
1065         if(!init_control())
1066                 return false;
1067
1068         if (!device_standby)
1069                 device_enable();
1070
1071         /* Run subnet-up scripts for our own subnets */
1072
1073         subnet_update(myself, NULL, true);
1074
1075         return true;
1076 }
1077
1078 /*
1079   close all open network connections
1080 */
1081 void close_network_connections(void) {
1082         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1083                 next = node->next;
1084                 connection_t *c = node->data;
1085                 /* Keep control connections open until the end, so they know when we really terminated */
1086                 if(c->status.control)
1087                         c->socket = -1;
1088                 c->outgoing = NULL;
1089                 terminate_connection(c, false);
1090         }
1091
1092         if(outgoing_list)
1093                 list_delete_list(outgoing_list);
1094
1095         if(myself && myself->connection) {
1096                 subnet_update(myself, NULL, false);
1097                 terminate_connection(myself->connection, false);
1098                 free_connection(myself->connection);
1099         }
1100
1101         for(int i = 0; i < listen_sockets; i++) {
1102                 io_del(&listen_socket[i].tcp);
1103                 io_del(&listen_socket[i].udp);
1104                 close(listen_socket[i].tcp.fd);
1105                 close(listen_socket[i].udp.fd);
1106         }
1107
1108         exit_requests();
1109         exit_edges();
1110         exit_subnets();
1111         exit_nodes();
1112         exit_connections();
1113
1114         if (!device_standby)
1115                 device_disable();
1116
1117         free(myport);
1118
1119         if (device_fd >= 0)
1120                 io_del(&device_io);
1121         if (devops.close)
1122                 devops.close();
1123
1124         exit_control();
1125
1126         free(myname);
1127         free(scriptextension);
1128         free(scriptinterpreter);
1129
1130         return;
1131 }