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

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