git.meshlink.io Git - meshlink/blob - src/net_setup.c

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2013 Guus Sliepen <guus@tinc-vpn.org>
   5                   2006      Scott Lamb <slamb@slamb.org>
   6                   2010      Brandon Black <blblack@gmail.com>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License along
  19     with this program; if not, write to the Free Software Foundation, Inc.,
  20     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21 */
  22
  23 #include "system.h"
  24
  25 #include "cipher.h"
  26 #include "conf.h"
  27 #include "connection.h"
  28 #include "control.h"
  29 #include "device.h"
  30 #include "digest.h"
  31 #include "ecdsa.h"
  32 #include "graph.h"
  33 #include "logger.h"
  34 #include "names.h"
  35 #include "net.h"
  36 #include "netutl.h"
  37 #include "process.h"
  38 #include "protocol.h"
  39 #include "route.h"
  40 #include "rsa.h"
  41 #include "subnet.h"
  42 #include "utils.h"
  43 #include "xalloc.h"
  44
  45 char *myport;
  46 static io_t device_io;
  47 devops_t devops;
  48
  49 char *proxyhost;
  50 char *proxyport;
  51 char *proxyuser;
  52 char *proxypass;
  53 proxytype_t proxytype;
  54 int autoconnect;
  55 bool disablebuggypeers;
  56
  57 char *scriptinterpreter;
  58 char *scriptextension;
  59
  60 bool node_read_ecdsa_public_key(node_t *n) {
  61         if(ecdsa_active(n->ecdsa))
  62                 return true;
  63
  64         splay_tree_t *config_tree;
  65         FILE *fp;
  66         char *pubname = NULL;
  67         char *p;
  68
  69         init_configuration(&config_tree);
  70         if(!read_host_config(config_tree, n->name))
  71                 goto exit;
  72
  73         /* First, check for simple ECDSAPublicKey statement */
  74
  75         if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
  76                 n->ecdsa = ecdsa_set_base64_public_key(p);
  77                 free(p);
  78                 goto exit;
  79         }
  80
  81         /* Else, check for ECDSAPublicKeyFile statement and read it */
  82
  83         if(!get_config_string(lookup_config(config_tree, "ECDSAPublicKeyFile"), &pubname))
  84                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  85
  86         fp = fopen(pubname, "r");
  87
  88         if(!fp) {
  89                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s", pubname, strerror(errno));
  90                 goto exit;
  91         }
  92
  93         n->ecdsa = ecdsa_read_pem_public_key(fp);
  94         fclose(fp);
  95
  96 exit:
  97         exit_configuration(&config_tree);
  98         free(pubname);
  99         return n->ecdsa;
 100 }
 101
 102 bool read_ecdsa_public_key(connection_t *c) {
 103         if(ecdsa_active(c->ecdsa))
 104                 return true;
 105
 106         FILE *fp;
 107         char *fname;
 108         char *p;
 109
 110         if(!c->config_tree) {
 111                 init_configuration(&c->config_tree);
 112                 if(!read_host_config(c->config_tree, c->name))
 113                         return false;
 114         }
 115
 116         /* First, check for simple ECDSAPublicKey statement */
 117
 118         if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
 119                 c->ecdsa = ecdsa_set_base64_public_key(p);
 120                 free(p);
 121                 return c->ecdsa;
 122         }
 123
 124         /* Else, check for ECDSAPublicKeyFile statement and read it */
 125
 126         if(!get_config_string(lookup_config(c->config_tree, "ECDSAPublicKeyFile"), &fname))
 127                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 128
 129         fp = fopen(fname, "r");
 130
 131         if(!fp) {
 132                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s",
 133                            fname, strerror(errno));
 134                 free(fname);
 135                 return false;
 136         }
 137
 138         c->ecdsa = ecdsa_read_pem_public_key(fp);
 139         fclose(fp);
 140
 141         if(!c->ecdsa)
 142                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing ECDSA public key file `%s' failed.", fname);
 143         free(fname);
 144         return c->ecdsa;
 145 }
 146
 147 bool read_rsa_public_key(connection_t *c) {
 148         if(ecdsa_active(c->ecdsa))
 149                 return true;
 150
 151         FILE *fp;
 152         char *fname;
 153         char *n;
 154
 155         /* First, check for simple PublicKey statement */
 156
 157         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 158                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 159                 free(n);
 160                 return c->rsa;
 161         }
 162
 163         /* Else, check for PublicKeyFile statement and read it */
 164
 165         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 166                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 167
 168         fp = fopen(fname, "r");
 169
 170         if(!fp) {
 171                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 172                 free(fname);
 173                 return false;
 174         }
 175
 176         c->rsa = rsa_read_pem_public_key(fp);
 177         fclose(fp);
 178
 179         if(!c->rsa)
 180                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 181         free(fname);
 182         return c->rsa;
 183 }
 184
 185 static bool read_ecdsa_private_key(void) {
 186         FILE *fp;
 187         char *fname;
 188
 189         /* Check for PrivateKeyFile statement and read it */
 190
 191         if(!get_config_string(lookup_config(config_tree, "ECDSAPrivateKeyFile"), &fname))
 192                 xasprintf(&fname, "%s" SLASH "ecdsa_key.priv", confbase);
 193
 194         fp = fopen(fname, "r");
 195
 196         if(!fp) {
 197                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA private key file `%s': %s", fname, strerror(errno));
 198                 if(errno == ENOENT)
 199                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an ECDSA keypair with `tinc -n %s generate-ecdsa-keys'.", netname ?: ".");
 200                 free(fname);
 201                 return false;
 202         }
 203
 204 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 205         struct stat s;
 206
 207         if(fstat(fileno(fp), &s)) {
 208                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat ECDSA private key file `%s': %s'", fname, strerror(errno));
 209                 free(fname);
 210                 return false;
 211         }
 212
 213         if(s.st_mode & ~0100700)
 214                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for ECDSA private key file `%s'!", fname);
 215 #endif
 216
 217         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 218         fclose(fp);
 219
 220         if(!myself->connection->ecdsa)
 221                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 222         free(fname);
 223         return myself->connection->ecdsa;
 224 }
 225
 226 static bool read_invitation_key(void) {
 227         FILE *fp;
 228         char *fname;
 229
 230         if(invitation_key) {
 231                 ecdsa_free(invitation_key);
 232                 invitation_key = NULL;
 233         }
 234
 235         xasprintf(&fname, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", confbase);
 236
 237         fp = fopen(fname, "r");
 238
 239         if(fp) {
 240                 invitation_key = ecdsa_read_pem_private_key(fp);
 241                 fclose(fp);
 242                 if(!invitation_key)
 243                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 244         }
 245
 246         free(fname);
 247         return invitation_key;
 248 }
 249
 250 static bool read_rsa_private_key(void) {
 251         FILE *fp;
 252         char *fname;
 253         char *n, *d;
 254
 255         /* First, check for simple PrivateKey statement */
 256
 257         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 258                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 259                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 260                         free(d);
 261                         return false;
 262                 }
 263                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 264                 free(n);
 265                 free(d);
 266                 return myself->connection->rsa;
 267         }
 268
 269         /* Else, check for PrivateKeyFile statement and read it */
 270
 271         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 272                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 273
 274         fp = fopen(fname, "r");
 275
 276         if(!fp) {
 277                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 278                            fname, strerror(errno));
 279                 free(fname);
 280                 return false;
 281         }
 282
 283 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 284         struct stat s;
 285
 286         if(fstat(fileno(fp), &s)) {
 287                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 288                 free(fname);
 289                 return false;
 290         }
 291
 292         if(s.st_mode & ~0100700)
 293                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 294 #endif
 295
 296         myself->connection->rsa = rsa_read_pem_private_key(fp);
 297         fclose(fp);
 298
 299         if(!myself->connection->rsa)
 300                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 301         free(fname);
 302         return myself->connection->rsa;
 303 }
 304
 305 static timeout_t keyexpire_timeout;
 306
 307 static void keyexpire_handler(void *data) {
 308         regenerate_key();
 309         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 310 }
 311
 312 void regenerate_key(void) {
 313         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 314         send_key_changed();
 315 }
 316
 317 /*
 318   Read Subnets from all host config files
 319 */
 320 void load_all_subnets(void) {
 321         DIR *dir;
 322         struct dirent *ent;
 323         char *dname;
 324
 325         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 326         dir = opendir(dname);
 327         if(!dir) {
 328                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 329                 free(dname);
 330                 return;
 331         }
 332
 333         while((ent = readdir(dir))) {
 334                 if(!check_id(ent->d_name))
 335                         continue;
 336
 337                 node_t *n = lookup_node(ent->d_name);
 338                 #ifdef _DIRENT_HAVE_D_TYPE
 339                 //if(ent->d_type != DT_REG)
 340                 //      continue;
 341                 #endif
 342
 343                 splay_tree_t *config_tree;
 344                 init_configuration(&config_tree);
 345                 read_config_options(config_tree, ent->d_name);
 346                 read_host_config(config_tree, ent->d_name);
 347
 348                 if(!n) {
 349                         n = new_node();
 350                         n->name = xstrdup(ent->d_name);
 351                         node_add(n);
 352                 }
 353
 354                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 355                         subnet_t *s, *s2;
 356
 357                         if(!get_config_subnet(cfg, &s))
 358                                 continue;
 359
 360                         if((s2 = lookup_subnet(n, s))) {
 361                                 s2->expires = -1;
 362                         } else {
 363                                 subnet_add(n, s);
 364                         }
 365                 }
 366
 367                 exit_configuration(&config_tree);
 368         }
 369
 370         closedir(dir);
 371 }
 372
 373 void load_all_nodes(void) {
 374         DIR *dir;
 375         struct dirent *ent;
 376         char *dname;
 377
 378         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 379         dir = opendir(dname);
 380         if(!dir) {
 381                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 382                 free(dname);
 383                 return;
 384         }
 385
 386         while((ent = readdir(dir))) {
 387                 if(!check_id(ent->d_name))
 388                         continue;
 389
 390                 node_t *n = lookup_node(ent->d_name);
 391                 if(n)
 392                         continue;
 393
 394                 n = new_node();
 395                 n->name = xstrdup(ent->d_name);
 396                 node_add(n);
 397         }
 398
 399         closedir(dir);
 400 }
 401
 402
 403 char *get_name(void) {
 404         char *name = NULL;
 405
 406         get_config_string(lookup_config(config_tree, "Name"), &name);
 407
 408         if(!name)
 409                 return NULL;
 410
 411         if(*name == '$') {
 412                 char *envname = getenv(name + 1);
 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                         char envname[32];
 419                         if(gethostname(envname, 32)) {
 420                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", strerror(errno));
 421                                 return false;
 422                         }
 423                         envname[31] = 0;
 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 #ifdef HAVE_MINGW
 459                 scriptextension = xstrdup(".bat");
 460 #else
 461                 scriptextension = xstrdup("");
 462 #endif
 463
 464         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 465         if(proxy) {
 466                 if((space = strchr(proxy, ' ')))
 467                         *space++ = 0;
 468
 469                 if(!strcasecmp(proxy, "none")) {
 470                         proxytype = PROXY_NONE;
 471                 } else if(!strcasecmp(proxy, "socks4")) {
 472                         proxytype = PROXY_SOCKS4;
 473                 } else if(!strcasecmp(proxy, "socks4a")) {
 474                         proxytype = PROXY_SOCKS4A;
 475                 } else if(!strcasecmp(proxy, "socks5")) {
 476                         proxytype = PROXY_SOCKS5;
 477                 } else if(!strcasecmp(proxy, "http")) {
 478                         proxytype = PROXY_HTTP;
 479                 } else if(!strcasecmp(proxy, "exec")) {
 480                         proxytype = PROXY_EXEC;
 481                 } else {
 482                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 483                         return false;
 484                 }
 485
 486                 switch(proxytype) {
 487                         case PROXY_NONE:
 488                         default:
 489                                 break;
 490
 491                         case PROXY_EXEC:
 492                                 if(!space || !*space) {
 493                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 494                                         return false;
 495                                 }
 496                                 proxyhost =  xstrdup(space);
 497                                 break;
 498
 499                         case PROXY_SOCKS4:
 500                         case PROXY_SOCKS4A:
 501                         case PROXY_SOCKS5:
 502                         case PROXY_HTTP:
 503                                 proxyhost = space;
 504                                 if(space && (space = strchr(space, ' ')))
 505                                         *space++ = 0, proxyport = space;
 506                                 if(space && (space = strchr(space, ' ')))
 507                                         *space++ = 0, proxyuser = space;
 508                                 if(space && (space = strchr(space, ' ')))
 509                                         *space++ = 0, proxypass = space;
 510                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 511                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 512                                         return false;
 513                                 }
 514                                 proxyhost = xstrdup(proxyhost);
 515                                 proxyport = xstrdup(proxyport);
 516                                 if(proxyuser && *proxyuser)
 517                                         proxyuser = xstrdup(proxyuser);
 518                                 if(proxypass && *proxypass)
 519                                         proxypass = xstrdup(proxypass);
 520                                 break;
 521                 }
 522
 523                 free(proxy);
 524         }
 525
 526         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 527                 myself->options |= OPTION_INDIRECT;
 528
 529         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 530                 myself->options |= OPTION_TCPONLY;
 531
 532         if(myself->options & OPTION_TCPONLY)
 533                 myself->options |= OPTION_INDIRECT;
 534
 535         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 536         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 537
 538         memset(&localdiscovery_address, 0, sizeof localdiscovery_address);
 539         if(get_config_string(lookup_config(config_tree, "LocalDiscoveryAddress"), &address)) {
 540                 struct addrinfo *ai = str2addrinfo(address, myport, SOCK_DGRAM);
 541                 free(address);
 542                 if(!ai)
 543                         return false;
 544                 memcpy(&localdiscovery_address, ai->ai_addr, ai->ai_addrlen);
 545         }
 546
 547
 548         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 549                 if(!strcasecmp(rmode, "router"))
 550                         routing_mode = RMODE_ROUTER;
 551                 else if(!strcasecmp(rmode, "switch"))
 552                         routing_mode = RMODE_SWITCH;
 553                 else if(!strcasecmp(rmode, "hub"))
 554                         routing_mode = RMODE_HUB;
 555                 else {
 556                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 557                         return false;
 558                 }
 559                 free(rmode);
 560         }
 561
 562         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 563                 if(!strcasecmp(fmode, "off"))
 564                         forwarding_mode = FMODE_OFF;
 565                 else if(!strcasecmp(fmode, "internal"))
 566                         forwarding_mode = FMODE_INTERNAL;
 567                 else if(!strcasecmp(fmode, "kernel"))
 568                         forwarding_mode = FMODE_KERNEL;
 569                 else {
 570                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 571                         return false;
 572                 }
 573                 free(fmode);
 574         }
 575
 576         choice = true;
 577         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 578         if(choice)
 579                 myself->options |= OPTION_PMTU_DISCOVERY;
 580
 581         choice = true;
 582         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 583         if(choice)
 584                 myself->options |= OPTION_CLAMP_MSS;
 585
 586         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 587         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 588         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 589                 if(!strcasecmp(bmode, "no"))
 590                         broadcast_mode = BMODE_NONE;
 591                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 592                         broadcast_mode = BMODE_MST;
 593                 else if(!strcasecmp(bmode, "direct"))
 594                         broadcast_mode = BMODE_DIRECT;
 595                 else {
 596                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 597                         return false;
 598                 }
 599                 free(bmode);
 600         }
 601
 602 #if !defined(SOL_IP) || !defined(IP_TOS)
 603         if(priorityinheritance)
 604                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 605 #endif
 606
 607         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 608                 macexpire = 600;
 609
 610         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 611                 if(maxtimeout <= 0) {
 612                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 613                         return false;
 614                 }
 615         } else
 616                 maxtimeout = 900;
 617
 618         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 619                 if(!strcasecmp(afname, "IPv4"))
 620                         addressfamily = AF_INET;
 621                 else if(!strcasecmp(afname, "IPv6"))
 622                         addressfamily = AF_INET6;
 623                 else if(!strcasecmp(afname, "any"))
 624                         addressfamily = AF_UNSPEC;
 625                 else {
 626                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 627                         return false;
 628                 }
 629                 free(afname);
 630         }
 631
 632         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 633
 634         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 635                 keylifetime = 3600;
 636
 637         get_config_int(lookup_config(config_tree, "AutoConnect"), &autoconnect);
 638
 639         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 640
 641         read_invitation_key();
 642
 643         return true;
 644 }
 645
 646 /*
 647   Configure node_t myself and set up the local sockets (listen only)
 648 */
 649 static bool setup_myself(void) {
 650         char *name, *hostname, *cipher, *digest, *type;
 651         char *address = NULL;
 652
 653         if(!(name = get_name())) {
 654                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 655                 return false;
 656         }
 657
 658         myself = new_node();
 659         myself->connection = new_connection();
 660         myself->name = name;
 661         myself->connection->name = xstrdup(name);
 662         read_host_config(config_tree, name);
 663
 664         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 665                 myport = xstrdup("655");
 666
 667         xasprintf(&myself->hostname, "MYSELF port %s", myport);
 668         myself->connection->hostname = xstrdup(myself->hostname);
 669
 670         myself->connection->options = 0;
 671         myself->connection->protocol_major = PROT_MAJOR;
 672         myself->connection->protocol_minor = PROT_MINOR;
 673
 674         myself->options |= PROT_MINOR << 24;
 675
 676         get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental);
 677
 678         if(experimental && !read_ecdsa_private_key())
 679                 return false;
 680
 681         if(!read_rsa_private_key())
 682                 return false;
 683
 684         if(!atoi(myport)) {
 685                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 686                 sockaddr_t sa;
 687                 if(!ai || !ai->ai_addr)
 688                         return false;
 689                 free(myport);
 690                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 691                 sockaddr2str(&sa, NULL, &myport);
 692         }
 693
 694         /* Read in all the subnets specified in the host configuration file */
 695
 696         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 697                 subnet_t *subnet;
 698
 699                 if(!get_config_subnet(cfg, &subnet))
 700                         return false;
 701
 702                 subnet_add(myself, subnet);
 703         }
 704
 705         /* Check some options */
 706
 707         if(!setup_myself_reloadable())
 708                 return false;
 709
 710         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 711         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 712         strictsubnets |= tunnelserver;
 713
 714         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 715                 if(max_connection_burst <= 0) {
 716                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 717                         return false;
 718                 }
 719         }
 720
 721         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 722                 if(udp_rcvbuf <= 0) {
 723                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 724                         return false;
 725                 }
 726         }
 727
 728         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 729                 if(udp_sndbuf <= 0) {
 730                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 731                         return false;
 732                 }
 733         }
 734
 735         int replaywin_int;
 736         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 737                 if(replaywin_int < 0) {
 738                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 739                         return false;
 740                 }
 741                 replaywin = (unsigned)replaywin_int;
 742                 sptps_replaywin = replaywin;
 743         }
 744
 745         /* Generate packet encryption key */
 746
 747         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 748                 cipher = xstrdup("blowfish");
 749
 750         if(!(myself->incipher = cipher_open_by_name(cipher))) {
 751                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 752                 return false;
 753         }
 754
 755         free(cipher);
 756
 757         send_key_changed();
 758         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 759
 760         /* Check if we want to use message authentication codes... */
 761
 762         int maclength = 4;
 763         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 764
 765         if(maclength < 0) {
 766                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 767                 return false;
 768         }
 769
 770         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 771                 digest = xstrdup("sha1");
 772
 773         if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 774                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 775                 return false;
 776         }
 777
 778         free(digest);
 779
 780         /* Compression */
 781
 782         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 783                 if(myself->incompression < 0 || myself->incompression > 11) {
 784                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 785                         return false;
 786                 }
 787         } else
 788                 myself->incompression = 0;
 789
 790         myself->connection->outcompression = 0;
 791
 792         /* Done */
 793
 794         myself->nexthop = myself;
 795         myself->via = myself;
 796         myself->status.reachable = true;
 797         myself->last_state_change = now.tv_sec;
 798         myself->status.sptps = experimental;
 799         node_add(myself);
 800
 801         graph();
 802
 803         if(strictsubnets)
 804                 load_all_subnets();
 805         else if(autoconnect)
 806                 load_all_nodes();
 807
 808         /* Open device */
 809
 810         devops = os_devops;
 811
 812         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 813                 if(!strcasecmp(type, "dummy"))
 814                         devops = dummy_devops;
 815                 else if(!strcasecmp(type, "raw_socket"))
 816                         devops = raw_socket_devops;
 817                 else if(!strcasecmp(type, "multicast"))
 818                         devops = multicast_devops;
 819 #ifdef ENABLE_UML
 820                 else if(!strcasecmp(type, "uml"))
 821                         devops = uml_devops;
 822 #endif
 823 #ifdef ENABLE_VDE
 824                 else if(!strcasecmp(type, "vde"))
 825                         devops = vde_devops;
 826 #endif
 827         }
 828
 829         if(!devops.setup())
 830                 return false;
 831
 832         if(device_fd >= 0)
 833                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 834
 835         /* Run tinc-up script to further initialize the tap interface */
 836         char *envp[5] = {NULL};
 837         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 838         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 839         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 840         xasprintf(&envp[3], "NAME=%s", myself->name);
 841
 842         execute_script("tinc-up", envp);
 843
 844         for(int i = 0; i < 4; i++)
 845                 free(envp[i]);
 846
 847         /* Run subnet-up scripts for our own subnets */
 848
 849         subnet_update(myself, NULL, true);
 850
 851         /* Open sockets */
 852
 853         if(!do_detach && getenv("LISTEN_FDS")) {
 854                 sockaddr_t sa;
 855                 socklen_t salen;
 856
 857                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 858 #ifdef HAVE_UNSETENV
 859                 unsetenv("LISTEN_FDS");
 860 #endif
 861
 862                 if(listen_sockets > MAXSOCKETS) {
 863                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 864                         return false;
 865                 }
 866
 867                 for(int i = 0; i < listen_sockets; i++) {
 868                         salen = sizeof sa;
 869                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 870                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
 871                                 return false;
 872                         }
 873
 874 #ifdef FD_CLOEXEC
 875                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 876 #endif
 877
 878                         int udp_fd = setup_vpn_in_socket(&sa);
 879                         if(udp_fd < 0)
 880                                 return false;
 881
 882                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
 883                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
 884
 885                         if(debug_level >= DEBUG_CONNECTIONS) {
 886                                 hostname = sockaddr2hostname(&sa);
 887                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 888                                 free(hostname);
 889                         }
 890
 891                         memcpy(&listen_socket[i].sa, &sa, salen);
 892                 }
 893         } else {
 894                 listen_sockets = 0;
 895                 config_t *cfg = lookup_config(config_tree, "BindToAddress");
 896
 897                 do {
 898                         get_config_string(cfg, &address);
 899                         if(cfg)
 900                                 cfg = lookup_config_next(config_tree, cfg);
 901
 902                         char *port = myport;
 903
 904                         if(address) {
 905                                 char *space = strchr(address, ' ');
 906                                 if(space) {
 907                                         *space++ = 0;
 908                                         port = space;
 909                                 }
 910
 911                                 if(!strcmp(address, "*"))
 912                                         *address = 0;
 913                         }
 914
 915                         struct addrinfo *ai, hint = {0};
 916                         hint.ai_family = addressfamily;
 917                         hint.ai_socktype = SOCK_STREAM;
 918                         hint.ai_protocol = IPPROTO_TCP;
 919                         hint.ai_flags = AI_PASSIVE;
 920
 921                         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 922                         free(address);
 923
 924                         if(err || !ai) {
 925                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 926                                 return false;
 927                         }
 928
 929                         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 930                                 if(listen_sockets >= MAXSOCKETS) {
 931                                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 932                                         return false;
 933                                 }
 934
 935                                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 936
 937                                 if(tcp_fd < 0)
 938                                         continue;
 939
 940                                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 941
 942                                 if(tcp_fd < 0) {
 943                                         close(tcp_fd);
 944                                         continue;
 945                                 }
 946
 947                                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 948                                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 949
 950                                 if(debug_level >= DEBUG_CONNECTIONS) {
 951                                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 952                                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 953                                         free(hostname);
 954                                 }
 955
 956                                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 957                                 listen_sockets++;
 958                         }
 959
 960                         freeaddrinfo(ai);
 961                 } while(cfg);
 962         }
 963
 964         if(listen_sockets)
 965                 logger(DEBUG_ALWAYS, LOG_NOTICE, "Ready");
 966         else {
 967                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
 968                 return false;
 969         }
 970
 971         last_config_check = now.tv_sec;
 972
 973         return true;
 974 }
 975
 976 /*
 977   initialize network
 978 */
 979 bool setup_network(void) {
 980         init_connections();
 981         init_subnets();
 982         init_nodes();
 983         init_edges();
 984         init_requests();
 985
 986         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 987                 if(pinginterval < 1) {
 988                         pinginterval = 86400;
 989                 }
 990         } else
 991                 pinginterval = 60;
 992
 993         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 994                 pingtimeout = 5;
 995         if(pingtimeout < 1 || pingtimeout > pinginterval)
 996                 pingtimeout = pinginterval;
 997
 998         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 999                 maxoutbufsize = 10 * MTU;
1000
1001         if(!setup_myself())
1002                 return false;
1003
1004         return true;
1005 }
1006
1007 /*
1008   close all open network connections
1009 */
1010 void close_network_connections(void) {
1011         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1012                 next = node->next;
1013                 connection_t *c = node->data;
1014                 /* Keep control connections open until the end, so they know when we really terminated */
1015                 if(c->status.control)
1016                         c->socket = -1;
1017                 c->outgoing = NULL;
1018                 terminate_connection(c, false);
1019         }
1020
1021         list_delete_list(outgoing_list);
1022
1023         if(myself && myself->connection) {
1024                 subnet_update(myself, NULL, false);
1025                 terminate_connection(myself->connection, false);
1026                 free_connection(myself->connection);
1027         }
1028
1029         for(int i = 0; i < listen_sockets; i++) {
1030                 io_del(&listen_socket[i].tcp);
1031                 io_del(&listen_socket[i].udp);
1032                 close(listen_socket[i].tcp.fd);
1033                 close(listen_socket[i].udp.fd);
1034         }
1035
1036         char *envp[5] = {NULL};
1037         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
1038         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
1039         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
1040         xasprintf(&envp[3], "NAME=%s", myself->name);
1041
1042         exit_requests();
1043         exit_edges();
1044         exit_subnets();
1045         exit_nodes();
1046         exit_connections();
1047
1048         execute_script("tinc-down", envp);
1049
1050         if(myport) free(myport);
1051
1052         for(int i = 0; i < 4; i++)
1053                 free(envp[i]);
1054
1055         devops.close();
1056
1057         return;
1058 }