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 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 bool 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 Ed25519PublicKey statement */
  75
  76         if(get_config_string(lookup_config(config_tree, "Ed25519PublicKey"), &p)) {
  77                 n->ecdsa = ecdsa_set_base64_public_key(p);
  78                 free(p);
  79                 goto exit;
  80         }
  81
  82         /* Else, check for Ed25519PublicKeyFile statement and read it */
  83
  84         if(!get_config_string(lookup_config(config_tree, "Ed25519PublicKeyFile"), &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 Ed25519PublicKey statement */
 116
 117         if(get_config_string(lookup_config(c->config_tree, "Ed25519PublicKey"), &p)) {
 118                 c->ecdsa = ecdsa_set_base64_public_key(p);
 119                 free(p);
 120                 return c->ecdsa;
 121         }
 122
 123         /* Else, check for Ed25519PublicKeyFile statement and read it */
 124
 125         if(!get_config_string(lookup_config(c->config_tree, "Ed25519PublicKeyFile"), &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 Ed25519 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 Ed25519 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, "Ed25519PrivateKeyFile"), &fname))
 191                 xasprintf(&fname, "%s" SLASH "ed25519_key.priv", confbase);
 192
 193         fp = fopen(fname, "r");
 194
 195         if(!fp) {
 196                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 private key file `%s': %s", fname, strerror(errno));
 197                 if(errno == ENOENT)
 198                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an Ed25519 keypair with `tinc -n %s generate-ed25519-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 Ed25519 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 Ed25519 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 Ed25519 private key file `%s' failed", fname);
 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 "ed25519_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 Ed25519 private key file `%s' failed", fname);
 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         config_t *cfg = lookup_config(config_tree, "AutoConnect");
 634         if(cfg) {
 635                 if(!get_config_bool(cfg, &autoconnect)) {
 636                         // Some backwards compatibility with when this option was an int
 637                         int val = 0;
 638                         get_config_int(cfg, &val);
 639                         autoconnect = val;
 640                 }
 641         }
 642
 643         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 644
 645         read_invitation_key();
 646
 647         return true;
 648 }
 649
 650 /*
 651   Add listening sockets.
 652 */
 653 static bool add_listen_address(char *address, bool bindto) {
 654         char *port = myport;
 655
 656         if(address) {
 657                 char *space = strchr(address, ' ');
 658                 if(space) {
 659                         *space++ = 0;
 660                         port = space;
 661                 }
 662
 663                 if(!strcmp(address, "*"))
 664                         *address = 0;
 665         }
 666
 667         struct addrinfo *ai, hint = {0};
 668         hint.ai_family = addressfamily;
 669         hint.ai_socktype = SOCK_STREAM;
 670         hint.ai_protocol = IPPROTO_TCP;
 671         hint.ai_flags = AI_PASSIVE;
 672
 673         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 674         free(address);
 675
 676         if(err || !ai) {
 677                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 678                 return false;
 679         }
 680
 681         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 682                 // Ignore duplicate addresses
 683                 bool found = false;
 684
 685                 for(int i = 0; i < listen_sockets; i++)
 686                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 687                                 found = true;
 688                                 break;
 689                         }
 690
 691                 if(found)
 692                         continue;
 693
 694                 if(listen_sockets >= MAXSOCKETS) {
 695                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 696                         return false;
 697                 }
 698
 699                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 700
 701                 if(tcp_fd < 0)
 702                         continue;
 703
 704                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 705
 706                 if(tcp_fd < 0) {
 707                         close(tcp_fd);
 708                         continue;
 709                 }
 710
 711                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 712                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 713
 714                 if(debug_level >= DEBUG_CONNECTIONS) {
 715                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 716                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 717                         free(hostname);
 718                 }
 719
 720                 listen_socket[listen_sockets].bindto = bindto;
 721                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 722                 listen_sockets++;
 723         }
 724
 725         freeaddrinfo(ai);
 726         return true;
 727 }
 728
 729 /*
 730   Configure node_t myself and set up the local sockets (listen only)
 731 */
 732 static bool setup_myself(void) {
 733         char *name, *hostname, *cipher, *digest, *type;
 734         char *address = NULL;
 735         bool port_specified = false;
 736
 737         if(!(name = get_name())) {
 738                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 739                 return false;
 740         }
 741
 742         myself = new_node();
 743         myself->connection = new_connection();
 744         myself->name = name;
 745         myself->connection->name = xstrdup(name);
 746         read_host_config(config_tree, name);
 747
 748         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 749                 myport = xstrdup("655");
 750         else
 751                 port_specified = true;
 752
 753         myself->connection->options = 0;
 754         myself->connection->protocol_major = PROT_MAJOR;
 755         myself->connection->protocol_minor = PROT_MINOR;
 756
 757         myself->options |= PROT_MINOR << 24;
 758
 759         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 760                 experimental = read_ecdsa_private_key();
 761                 if(!experimental)
 762                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 763         } else {
 764                 if(experimental && !read_ecdsa_private_key())
 765                         return false;
 766         }
 767
 768         if(!read_rsa_private_key())
 769                 return false;
 770
 771         /* Ensure myport is numeric */
 772
 773         if(!atoi(myport)) {
 774                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 775                 sockaddr_t sa;
 776                 if(!ai || !ai->ai_addr)
 777                         return false;
 778                 free(myport);
 779                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 780                 sockaddr2str(&sa, NULL, &myport);
 781         }
 782
 783         /* Read in all the subnets specified in the host configuration file */
 784
 785         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 786                 subnet_t *subnet;
 787
 788                 if(!get_config_subnet(cfg, &subnet))
 789                         return false;
 790
 791                 subnet_add(myself, subnet);
 792         }
 793
 794         /* Check some options */
 795
 796         if(!setup_myself_reloadable())
 797                 return false;
 798
 799         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 800         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 801         strictsubnets |= tunnelserver;
 802
 803         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 804                 if(max_connection_burst <= 0) {
 805                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 806                         return false;
 807                 }
 808         }
 809
 810         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 811                 if(udp_rcvbuf <= 0) {
 812                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 813                         return false;
 814                 }
 815         }
 816
 817         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 818                 if(udp_sndbuf <= 0) {
 819                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 820                         return false;
 821                 }
 822         }
 823
 824         int replaywin_int;
 825         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 826                 if(replaywin_int < 0) {
 827                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 828                         return false;
 829                 }
 830                 replaywin = (unsigned)replaywin_int;
 831                 sptps_replaywin = replaywin;
 832         }
 833
 834         /* Generate packet encryption key */
 835
 836         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 837                 cipher = xstrdup("blowfish");
 838
 839         if(!strcasecmp(cipher, "none")) {
 840                 myself->incipher = NULL;
 841         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 842                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 843                 return false;
 844         }
 845
 846         free(cipher);
 847
 848         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 849
 850         /* Check if we want to use message authentication codes... */
 851
 852         int maclength = 4;
 853         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 854
 855         if(maclength < 0) {
 856                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 857                 return false;
 858         }
 859
 860         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 861                 digest = xstrdup("sha1");
 862
 863         if(!strcasecmp(digest, "none")) {
 864                 myself->indigest = NULL;
 865         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 866                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 867                 return false;
 868         }
 869
 870         free(digest);
 871
 872         /* Compression */
 873
 874         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 875                 if(myself->incompression < 0 || myself->incompression > 11) {
 876                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 877                         return false;
 878                 }
 879         } else
 880                 myself->incompression = 0;
 881
 882         myself->connection->outcompression = 0;
 883
 884         /* Done */
 885
 886         myself->nexthop = myself;
 887         myself->via = myself;
 888         myself->status.reachable = true;
 889         myself->last_state_change = now.tv_sec;
 890         myself->status.sptps = experimental;
 891         node_add(myself);
 892
 893         graph();
 894
 895         if(strictsubnets)
 896                 load_all_subnets();
 897         else if(autoconnect)
 898                 load_all_nodes();
 899
 900         /* Open device */
 901
 902         devops = os_devops;
 903
 904         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 905                 if(!strcasecmp(type, "dummy"))
 906                         devops = dummy_devops;
 907                 else if(!strcasecmp(type, "raw_socket"))
 908                         devops = raw_socket_devops;
 909                 else if(!strcasecmp(type, "multicast"))
 910                         devops = multicast_devops;
 911 #ifdef ENABLE_UML
 912                 else if(!strcasecmp(type, "uml"))
 913                         devops = uml_devops;
 914 #endif
 915 #ifdef ENABLE_VDE
 916                 else if(!strcasecmp(type, "vde"))
 917                         devops = vde_devops;
 918 #endif
 919         }
 920
 921         if(!devops.setup())
 922                 return false;
 923
 924         if(device_fd >= 0)
 925                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 926
 927         /* Open sockets */
 928
 929         if(!do_detach && getenv("LISTEN_FDS")) {
 930                 sockaddr_t sa;
 931                 socklen_t salen;
 932
 933                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 934 #ifdef HAVE_UNSETENV
 935                 unsetenv("LISTEN_FDS");
 936 #endif
 937
 938                 if(listen_sockets > MAXSOCKETS) {
 939                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 940                         return false;
 941                 }
 942
 943                 for(int i = 0; i < listen_sockets; i++) {
 944                         salen = sizeof sa;
 945                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 946                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
 947                                 return false;
 948                         }
 949
 950 #ifdef FD_CLOEXEC
 951                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 952 #endif
 953
 954                         int udp_fd = setup_vpn_in_socket(&sa);
 955                         if(udp_fd < 0)
 956                                 return false;
 957
 958                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
 959                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
 960
 961                         if(debug_level >= DEBUG_CONNECTIONS) {
 962                                 hostname = sockaddr2hostname(&sa);
 963                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 964                                 free(hostname);
 965                         }
 966
 967                         memcpy(&listen_socket[i].sa, &sa, salen);
 968                 }
 969         } else {
 970                 listen_sockets = 0;
 971                 int cfgs = 0;
 972
 973                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 974                         cfgs++;
 975                         get_config_string(cfg, &address);
 976                         if(!add_listen_address(address, true))
 977                                 return false;
 978                 }
 979
 980                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 981                         cfgs++;
 982                         get_config_string(cfg, &address);
 983                         if(!add_listen_address(address, false))
 984                                 return false;
 985                 }
 986
 987                 if(!cfgs)
 988                         if(!add_listen_address(address, NULL))
 989                                 return false;
 990         }
 991
 992         if(!listen_sockets) {
 993                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
 994                 return false;
 995         }
 996
 997         /* If no Port option was specified, set myport to the port used by the first listening socket. */
 998
 999         if(!port_specified) {
1000                 sockaddr_t sa;
1001                 socklen_t salen = sizeof sa;
1002                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1003                         free(myport);
1004                         sockaddr2str(&sa, NULL, &myport);
1005                         if(!myport)
1006                                 myport = xstrdup("655");
1007                 }
1008         }
1009
1010         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1011         myself->connection->hostname = xstrdup(myself->hostname);
1012
1013         /* Done. */
1014
1015         last_config_check = now.tv_sec;
1016
1017         return true;
1018 }
1019
1020 /*
1021   initialize network
1022 */
1023 bool setup_network(void) {
1024         init_connections();
1025         init_subnets();
1026         init_nodes();
1027         init_edges();
1028         init_requests();
1029
1030         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1031                 if(pinginterval < 1) {
1032                         pinginterval = 86400;
1033                 }
1034         } else
1035                 pinginterval = 60;
1036
1037         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
1038                 pingtimeout = 5;
1039         if(pingtimeout < 1 || pingtimeout > pinginterval)
1040                 pingtimeout = pinginterval;
1041
1042         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
1043                 maxoutbufsize = 10 * MTU;
1044
1045         if(!setup_myself())
1046                 return false;
1047
1048         if(!init_control())
1049                 return false;
1050
1051         /* Run tinc-up script to further initialize the tap interface */
1052
1053         char *envp[5] = {NULL};
1054         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
1055         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
1056         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
1057         xasprintf(&envp[3], "NAME=%s", myself->name);
1058
1059         execute_script("tinc-up", envp);
1060
1061         for(int i = 0; i < 4; i++)
1062                 free(envp[i]);
1063
1064         /* Run subnet-up scripts for our own subnets */
1065
1066         subnet_update(myself, NULL, true);
1067
1068         return true;
1069 }
1070
1071 /*
1072   close all open network connections
1073 */
1074 void close_network_connections(void) {
1075         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1076                 next = node->next;
1077                 connection_t *c = node->data;
1078                 /* Keep control connections open until the end, so they know when we really terminated */
1079                 if(c->status.control)
1080                         c->socket = -1;
1081                 c->outgoing = NULL;
1082                 terminate_connection(c, false);
1083         }
1084
1085         if(outgoing_list)
1086                 list_delete_list(outgoing_list);
1087
1088         if(myself && myself->connection) {
1089                 subnet_update(myself, NULL, false);
1090                 terminate_connection(myself->connection, false);
1091                 free_connection(myself->connection);
1092         }
1093
1094         for(int i = 0; i < listen_sockets; i++) {
1095                 io_del(&listen_socket[i].tcp);
1096                 io_del(&listen_socket[i].udp);
1097                 close(listen_socket[i].tcp.fd);
1098                 close(listen_socket[i].udp.fd);
1099         }
1100
1101         char *envp[5] = {NULL};
1102         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
1103         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
1104         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
1105         xasprintf(&envp[3], "NAME=%s", myself->name);
1106
1107         exit_requests();
1108         exit_edges();
1109         exit_subnets();
1110         exit_nodes();
1111         exit_connections();
1112
1113         execute_script("tinc-down", envp);
1114
1115         if(myport) free(myport);
1116
1117         for(int i = 0; i < 4; i++)
1118                 free(envp[i]);
1119
1120         devops.close();
1121
1122         exit_control();
1123
1124         return;
1125 }