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@meshlink.io>
   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 "digest.h"
  29 #include "ecdsa.h"
  30 #include "graph.h"
  31 #include "logger.h"
  32 #include "net.h"
  33 #include "netutl.h"
  34 #include "protocol.h"
  35 #include "route.h"
  36 #include "rsa.h"
  37 #include "utils.h"
  38 #include "xalloc.h"
  39
  40 char *myport;
  41
  42 char *proxyhost;
  43 char *proxyport;
  44 char *proxyuser;
  45 char *proxypass;
  46 proxytype_t proxytype;
  47 int autoconnect;
  48 bool disablebuggypeers;
  49
  50 bool node_read_ecdsa_public_key(node_t *n) {
  51         if(ecdsa_active(n->ecdsa))
  52                 return true;
  53
  54         splay_tree_t *config_tree;
  55         FILE *fp;
  56         char *pubname = NULL;
  57         char *p;
  58
  59         init_configuration(&config_tree);
  60         if(!read_host_config(config_tree, n->name))
  61                 goto exit;
  62
  63         /* First, check for simple ECDSAPublicKey statement */
  64
  65         if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
  66                 n->ecdsa = ecdsa_set_base64_public_key(p);
  67                 free(p);
  68                 goto exit;
  69         }
  70
  71         /* Else, check for ECDSAPublicKeyFile statement and read it */
  72
  73         if(!get_config_string(lookup_config(config_tree, "ECDSAPublicKeyFile"), &pubname))
  74                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  75
  76         fp = fopen(pubname, "r");
  77
  78         if(!fp)
  79                 goto exit;
  80
  81         n->ecdsa = ecdsa_read_pem_public_key(fp);
  82         fclose(fp);
  83
  84 exit:
  85         exit_configuration(&config_tree);
  86         free(pubname);
  87         return n->ecdsa;
  88 }
  89
  90 bool read_ecdsa_public_key(connection_t *c) {
  91         if(ecdsa_active(c->ecdsa))
  92                 return true;
  93
  94         FILE *fp;
  95         char *fname;
  96         char *p;
  97
  98         if(!c->config_tree) {
  99                 init_configuration(&c->config_tree);
 100                 if(!read_host_config(c->config_tree, c->name))
 101                         return false;
 102         }
 103
 104         /* First, check for simple ECDSAPublicKey statement */
 105
 106         if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
 107                 c->ecdsa = ecdsa_set_base64_public_key(p);
 108                 free(p);
 109                 return c->ecdsa;
 110         }
 111
 112         /* Else, check for ECDSAPublicKeyFile statement and read it */
 113
 114         if(!get_config_string(lookup_config(c->config_tree, "ECDSAPublicKeyFile"), &fname))
 115                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 116
 117         fp = fopen(fname, "r");
 118
 119         if(!fp) {
 120                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s",
 121                            fname, strerror(errno));
 122                 free(fname);
 123                 return false;
 124         }
 125
 126         c->ecdsa = ecdsa_read_pem_public_key(fp);
 127         fclose(fp);
 128
 129         if(!c->ecdsa)
 130                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing ECDSA public key file `%s' failed.", fname);
 131         free(fname);
 132         return c->ecdsa;
 133 }
 134
 135 bool read_rsa_public_key(connection_t *c) {
 136         if(ecdsa_active(c->ecdsa))
 137                 return true;
 138
 139         FILE *fp;
 140         char *fname;
 141         char *n;
 142
 143         /* First, check for simple PublicKey statement */
 144
 145         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 146                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 147                 free(n);
 148                 return c->rsa;
 149         }
 150
 151         /* Else, check for PublicKeyFile statement and read it */
 152
 153         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 154                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 155
 156         fp = fopen(fname, "r");
 157
 158         if(!fp) {
 159                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 160                 free(fname);
 161                 return false;
 162         }
 163
 164         c->rsa = rsa_read_pem_public_key(fp);
 165         fclose(fp);
 166
 167         if(!c->rsa)
 168                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 169         free(fname);
 170         return c->rsa;
 171 }
 172
 173 static bool read_ecdsa_private_key(void) {
 174         FILE *fp;
 175         char *fname;
 176
 177         /* Check for PrivateKeyFile statement and read it */
 178
 179         if(!get_config_string(lookup_config(config_tree, "ECDSAPrivateKeyFile"), &fname))
 180                 xasprintf(&fname, "%s" SLASH "ecdsa_key.priv", confbase);
 181
 182         fp = fopen(fname, "r");
 183
 184         if(!fp) {
 185                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA private key file `%s': %s", fname, strerror(errno));
 186                 if(errno == ENOENT)
 187                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an ECDSA keypair with `tinc generate-ecdsa-keys'.");
 188                 free(fname);
 189                 return false;
 190         }
 191
 192 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 193         struct stat s;
 194
 195         if(fstat(fileno(fp), &s)) {
 196                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat ECDSA private key file `%s': %s'", fname, strerror(errno));
 197                 free(fname);
 198                 return false;
 199         }
 200
 201         if(s.st_mode & ~0100700)
 202                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for ECDSA private key file `%s'!", fname);
 203 #endif
 204
 205         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 206         fclose(fp);
 207
 208         if(!myself->connection->ecdsa)
 209                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 210         free(fname);
 211         return myself->connection->ecdsa;
 212 }
 213
 214 static bool read_invitation_key(void) {
 215         FILE *fp;
 216         char *fname;
 217
 218         if(invitation_key) {
 219                 ecdsa_free(invitation_key);
 220                 invitation_key = NULL;
 221         }
 222
 223         xasprintf(&fname, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", confbase);
 224
 225         fp = fopen(fname, "r");
 226
 227         if(fp) {
 228                 invitation_key = ecdsa_read_pem_private_key(fp);
 229                 fclose(fp);
 230                 if(!invitation_key)
 231                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 232         }
 233
 234         free(fname);
 235         return invitation_key;
 236 }
 237
 238 static bool read_rsa_private_key(void) {
 239         FILE *fp;
 240         char *fname;
 241         char *n, *d;
 242
 243         /* First, check for simple PrivateKey statement */
 244
 245         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 246                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 247                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 248                         free(d);
 249                         return false;
 250                 }
 251                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 252                 free(n);
 253                 free(d);
 254                 return myself->connection->rsa;
 255         }
 256
 257         /* Else, check for PrivateKeyFile statement and read it */
 258
 259         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 260                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 261
 262         fp = fopen(fname, "r");
 263
 264         if(!fp) {
 265                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 266                            fname, strerror(errno));
 267                 free(fname);
 268                 return false;
 269         }
 270
 271 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 272         struct stat s;
 273
 274         if(fstat(fileno(fp), &s)) {
 275                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 276                 free(fname);
 277                 return false;
 278         }
 279
 280         if(s.st_mode & ~0100700)
 281                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 282 #endif
 283
 284         myself->connection->rsa = rsa_read_pem_private_key(fp);
 285         fclose(fp);
 286
 287         if(!myself->connection->rsa)
 288                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 289         free(fname);
 290         return myself->connection->rsa;
 291 }
 292
 293 static timeout_t keyexpire_timeout;
 294
 295 static void keyexpire_handler(void *data) {
 296         regenerate_key();
 297         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 298 }
 299
 300 void regenerate_key(void) {
 301         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 302         send_key_changed();
 303 }
 304
 305 void load_all_nodes(void) {
 306         DIR *dir;
 307         struct dirent *ent;
 308         char *dname;
 309
 310         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 311         dir = opendir(dname);
 312         if(!dir) {
 313                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 314                 free(dname);
 315                 return;
 316         }
 317
 318         while((ent = readdir(dir))) {
 319                 if(!check_id(ent->d_name))
 320                         continue;
 321
 322                 node_t *n = lookup_node(ent->d_name);
 323                 if(n)
 324                         continue;
 325
 326                 n = new_node();
 327                 n->name = xstrdup(ent->d_name);
 328                 node_add(n);
 329         }
 330
 331         closedir(dir);
 332 }
 333
 334
 335 char *get_name(void) {
 336         char *name = NULL;
 337
 338         get_config_string(lookup_config(config_tree, "Name"), &name);
 339
 340         if(!name)
 341                 return NULL;
 342
 343         if(*name == '$') {
 344                 char *envname = getenv(name + 1);
 345                 char hostname[32] = "";
 346                 if(!envname) {
 347                         if(strcmp(name + 1, "HOST")) {
 348                                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1);
 349                                 return false;
 350                         }
 351                         if(gethostname(hostname, sizeof hostname) || !*hostname) {
 352                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", strerror(errno));
 353                                 return false;
 354                         }
 355                         hostname[31] = 0;
 356                         envname = hostname;
 357                 }
 358                 free(name);
 359                 name = xstrdup(envname);
 360                 for(char *c = name; *c; c++)
 361                         if(!isalnum(*c))
 362                                 *c = '_';
 363         }
 364
 365         if(!check_id(name)) {
 366                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
 367                 free(name);
 368                 return false;
 369         }
 370
 371         return name;
 372 }
 373
 374 bool setup_myself_reloadable(void) {
 375         char *proxy = NULL;
 376         char *rmode = NULL;
 377         char *fmode = NULL;
 378         char *bmode = NULL;
 379         char *afname = NULL;
 380         char *address = NULL;
 381         char *space;
 382         bool choice;
 383
 384         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 385         if(proxy) {
 386                 if((space = strchr(proxy, ' ')))
 387                         *space++ = 0;
 388
 389                 if(!strcasecmp(proxy, "none")) {
 390                         proxytype = PROXY_NONE;
 391                 } else if(!strcasecmp(proxy, "socks4")) {
 392                         proxytype = PROXY_SOCKS4;
 393                 } else if(!strcasecmp(proxy, "socks4a")) {
 394                         proxytype = PROXY_SOCKS4A;
 395                 } else if(!strcasecmp(proxy, "socks5")) {
 396                         proxytype = PROXY_SOCKS5;
 397                 } else if(!strcasecmp(proxy, "http")) {
 398                         proxytype = PROXY_HTTP;
 399                 } else if(!strcasecmp(proxy, "exec")) {
 400                         proxytype = PROXY_EXEC;
 401                 } else {
 402                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 403                         return false;
 404                 }
 405
 406                 switch(proxytype) {
 407                         case PROXY_NONE:
 408                         default:
 409                                 break;
 410
 411                         case PROXY_EXEC:
 412                                 if(!space || !*space) {
 413                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 414                                         return false;
 415                                 }
 416                                 proxyhost =  xstrdup(space);
 417                                 break;
 418
 419                         case PROXY_SOCKS4:
 420                         case PROXY_SOCKS4A:
 421                         case PROXY_SOCKS5:
 422                         case PROXY_HTTP:
 423                                 proxyhost = space;
 424                                 if(space && (space = strchr(space, ' ')))
 425                                         *space++ = 0, proxyport = space;
 426                                 if(space && (space = strchr(space, ' ')))
 427                                         *space++ = 0, proxyuser = space;
 428                                 if(space && (space = strchr(space, ' ')))
 429                                         *space++ = 0, proxypass = space;
 430                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 431                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 432                                         return false;
 433                                 }
 434                                 proxyhost = xstrdup(proxyhost);
 435                                 proxyport = xstrdup(proxyport);
 436                                 if(proxyuser && *proxyuser)
 437                                         proxyuser = xstrdup(proxyuser);
 438                                 if(proxypass && *proxypass)
 439                                         proxypass = xstrdup(proxypass);
 440                                 break;
 441                 }
 442
 443                 free(proxy);
 444         }
 445
 446         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 447                 myself->options |= OPTION_INDIRECT;
 448
 449         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 450                 myself->options |= OPTION_TCPONLY;
 451
 452         if(myself->options & OPTION_TCPONLY)
 453                 myself->options |= OPTION_INDIRECT;
 454
 455         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 456         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 457
 458         memset(&localdiscovery_address, 0, sizeof localdiscovery_address);
 459         if(get_config_string(lookup_config(config_tree, "LocalDiscoveryAddress"), &address)) {
 460                 struct addrinfo *ai = str2addrinfo(address, myport, SOCK_DGRAM);
 461                 free(address);
 462                 if(!ai)
 463                         return false;
 464                 memcpy(&localdiscovery_address, ai->ai_addr, ai->ai_addrlen);
 465         }
 466
 467
 468         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 469                 if(!strcasecmp(rmode, "router"))
 470                         routing_mode = RMODE_ROUTER;
 471                 else if(!strcasecmp(rmode, "switch"))
 472                         routing_mode = RMODE_SWITCH;
 473                 else if(!strcasecmp(rmode, "hub"))
 474                         routing_mode = RMODE_HUB;
 475                 else {
 476                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 477                         return false;
 478                 }
 479                 free(rmode);
 480         }
 481
 482         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 483                 if(!strcasecmp(fmode, "off"))
 484                         forwarding_mode = FMODE_OFF;
 485                 else if(!strcasecmp(fmode, "internal"))
 486                         forwarding_mode = FMODE_INTERNAL;
 487                 else if(!strcasecmp(fmode, "kernel"))
 488                         forwarding_mode = FMODE_KERNEL;
 489                 else {
 490                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 491                         return false;
 492                 }
 493                 free(fmode);
 494         }
 495
 496         choice = true;
 497         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 498         if(choice)
 499                 myself->options |= OPTION_PMTU_DISCOVERY;
 500
 501         choice = true;
 502         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 503         if(choice)
 504                 myself->options |= OPTION_CLAMP_MSS;
 505
 506         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 507         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 508         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 509                 if(!strcasecmp(bmode, "no"))
 510                         broadcast_mode = BMODE_NONE;
 511                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 512                         broadcast_mode = BMODE_MST;
 513                 else if(!strcasecmp(bmode, "direct"))
 514                         broadcast_mode = BMODE_DIRECT;
 515                 else {
 516                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 517                         return false;
 518                 }
 519                 free(bmode);
 520         }
 521
 522 #if !defined(SOL_IP) || !defined(IP_TOS)
 523         if(priorityinheritance)
 524                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 525 #endif
 526
 527         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 528                 macexpire = 600;
 529
 530         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 531                 if(maxtimeout <= 0) {
 532                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 533                         return false;
 534                 }
 535         } else
 536                 maxtimeout = 900;
 537
 538         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 539                 if(!strcasecmp(afname, "IPv4"))
 540                         addressfamily = AF_INET;
 541                 else if(!strcasecmp(afname, "IPv6"))
 542                         addressfamily = AF_INET6;
 543                 else if(!strcasecmp(afname, "any"))
 544                         addressfamily = AF_UNSPEC;
 545                 else {
 546                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 547                         return false;
 548                 }
 549                 free(afname);
 550         }
 551
 552         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 553
 554         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 555                 keylifetime = 3600;
 556
 557         get_config_int(lookup_config(config_tree, "AutoConnect"), &autoconnect);
 558         if(autoconnect < 0)
 559                 autoconnect = 0;
 560
 561         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 562
 563         read_invitation_key();
 564
 565         return true;
 566 }
 567
 568 /*
 569   Add listening sockets.
 570 */
 571 static bool add_listen_address(char *address, bool bindto) {
 572         char *port = myport;
 573
 574         if(address) {
 575                 char *space = strchr(address, ' ');
 576                 if(space) {
 577                         *space++ = 0;
 578                         port = space;
 579                 }
 580
 581                 if(!strcmp(address, "*"))
 582                         *address = 0;
 583         }
 584
 585         struct addrinfo *ai, hint = {0};
 586         hint.ai_family = addressfamily;
 587         hint.ai_socktype = SOCK_STREAM;
 588         hint.ai_protocol = IPPROTO_TCP;
 589         hint.ai_flags = AI_PASSIVE;
 590
 591         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 592         free(address);
 593
 594         if(err || !ai) {
 595                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 596                 return false;
 597         }
 598
 599         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 600                 // Ignore duplicate addresses
 601                 bool found = false;
 602
 603                 for(int i = 0; i < listen_sockets; i++)
 604                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 605                                 found = true;
 606                                 break;
 607                         }
 608
 609                 if(found)
 610                         continue;
 611
 612                 if(listen_sockets >= MAXSOCKETS) {
 613                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 614                         return false;
 615                 }
 616
 617                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 618
 619                 if(tcp_fd < 0)
 620                         continue;
 621
 622                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 623
 624                 if(tcp_fd < 0) {
 625                         close(tcp_fd);
 626                         continue;
 627                 }
 628
 629                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 630                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 631
 632                 if(debug_level >= DEBUG_CONNECTIONS) {
 633                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 634                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 635                         free(hostname);
 636                 }
 637
 638                 listen_socket[listen_sockets].bindto = bindto;
 639                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 640                 listen_sockets++;
 641         }
 642
 643         freeaddrinfo(ai);
 644         return true;
 645 }
 646
 647 /*
 648   Configure node_t myself and set up the local sockets (listen only)
 649 */
 650 bool setup_myself(void) {
 651         char *name, *hostname, *cipher, *digest, *type;
 652         char *address = NULL;
 653         bool port_specified = false;
 654
 655         if(!(name = get_name())) {
 656                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 657                 return false;
 658         }
 659
 660         myself = new_node();
 661         myself->connection = new_connection();
 662         myself->name = name;
 663         myself->connection->name = xstrdup(name);
 664         read_host_config(config_tree, name);
 665
 666         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 667                 myport = xstrdup("655");
 668         else
 669                 port_specified = true;
 670
 671         myself->connection->options = 0;
 672         myself->connection->protocol_major = PROT_MAJOR;
 673         myself->connection->protocol_minor = PROT_MINOR;
 674
 675         myself->options |= PROT_MINOR << 24;
 676
 677         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 678                 experimental = read_ecdsa_private_key();
 679                 if(!experimental)
 680                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 681         } else {
 682                 if(experimental && !read_ecdsa_private_key())
 683                         return false;
 684         }
 685
 686         if(!read_rsa_private_key())
 687                 return false;
 688
 689         /* Ensure myport is numeric */
 690
 691         if(!atoi(myport)) {
 692                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 693                 sockaddr_t sa;
 694                 if(!ai || !ai->ai_addr)
 695                         return false;
 696                 free(myport);
 697                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 698                 sockaddr2str(&sa, NULL, &myport);
 699         }
 700
 701         /* Check some options */
 702
 703         if(!setup_myself_reloadable())
 704                 return false;
 705
 706         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 707
 708         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 709                 if(max_connection_burst <= 0) {
 710                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 711                         return false;
 712                 }
 713         }
 714
 715         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 716                 if(udp_rcvbuf <= 0) {
 717                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 718                         return false;
 719                 }
 720         }
 721
 722         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 723                 if(udp_sndbuf <= 0) {
 724                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 725                         return false;
 726                 }
 727         }
 728
 729         int replaywin_int;
 730         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 731                 if(replaywin_int < 0) {
 732                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 733                         return false;
 734                 }
 735                 replaywin = (unsigned)replaywin_int;
 736                 sptps_replaywin = replaywin;
 737         }
 738
 739         /* Generate packet encryption key */
 740
 741         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 742                 cipher = xstrdup("blowfish");
 743
 744         if(!strcasecmp(cipher, "none")) {
 745                 myself->incipher = NULL;
 746         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 747                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 748                 return false;
 749         }
 750
 751         free(cipher);
 752
 753         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 754
 755         /* Check if we want to use message authentication codes... */
 756
 757         int maclength = 4;
 758         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 759
 760         if(maclength < 0) {
 761                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 762                 return false;
 763         }
 764
 765         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 766                 digest = xstrdup("sha1");
 767
 768         if(!strcasecmp(digest, "none")) {
 769                 myself->indigest = NULL;
 770         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 771                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 772                 return false;
 773         }
 774
 775         free(digest);
 776
 777         /* Compression */
 778
 779         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 780                 if(myself->incompression < 0 || myself->incompression > 11) {
 781                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 782                         return false;
 783                 }
 784         } else
 785                 myself->incompression = 0;
 786
 787         myself->connection->outcompression = 0;
 788
 789         /* Done */
 790
 791         myself->nexthop = myself;
 792         myself->via = myself;
 793         myself->status.reachable = true;
 794         myself->last_state_change = now.tv_sec;
 795         myself->status.sptps = experimental;
 796         node_add(myself);
 797
 798         graph();
 799
 800         if(autoconnect)
 801                 load_all_nodes();
 802
 803         /* Open sockets */
 804
 805         listen_sockets = 0;
 806         int cfgs = 0;
 807
 808         for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 809                 cfgs++;
 810                 get_config_string(cfg, &address);
 811                 if(!add_listen_address(address, true))
 812                         return false;
 813         }
 814
 815         for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 816                 cfgs++;
 817                 get_config_string(cfg, &address);
 818                 if(!add_listen_address(address, false))
 819                         return false;
 820         }
 821
 822         if(!cfgs)
 823                 if(!add_listen_address(address, NULL))
 824                         return false;
 825
 826         if(!listen_sockets) {
 827                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
 828                 return false;
 829         }
 830
 831         /* If no Port option was specified, set myport to the port used by the first listening socket. */
 832
 833         if(!port_specified) {
 834                 sockaddr_t sa;
 835                 socklen_t salen = sizeof sa;
 836                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
 837                         free(myport);
 838                         sockaddr2str(&sa, NULL, &myport);
 839                         if(!myport)
 840                                 myport = xstrdup("655");
 841                 }
 842         }
 843
 844         xasprintf(&myself->hostname, "MYSELF port %s", myport);
 845         myself->connection->hostname = xstrdup(myself->hostname);
 846
 847         /* Done. */
 848
 849         last_config_check = now.tv_sec;
 850
 851         return true;
 852 }
 853
 854 /*
 855   initialize network
 856 */
 857 bool setup_network(void) {
 858         init_connections();
 859         init_nodes();
 860         init_edges();
 861         init_requests();
 862
 863         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 864                 if(pinginterval < 1) {
 865                         pinginterval = 86400;
 866                 }
 867         } else
 868                 pinginterval = 60;
 869
 870         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 871                 pingtimeout = 5;
 872         if(pingtimeout < 1 || pingtimeout > pinginterval)
 873                 pingtimeout = pinginterval;
 874
 875         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 876                 maxoutbufsize = 10 * MTU;
 877
 878         if(!setup_myself())
 879                 return false;
 880
 881         return true;
 882 }
 883
 884 /*
 885   close all open network connections
 886 */
 887 void close_network_connections(void) {
 888         for(list_node_t *node = connection_list->head, *next; node; node = next) {
 889                 next = node->next;
 890                 connection_t *c = node->data;
 891                 c->outgoing = NULL;
 892                 terminate_connection(c, false);
 893         }
 894
 895         if(outgoing_list)
 896                 list_delete_list(outgoing_list);
 897
 898         if(myself && myself->connection) {
 899                 terminate_connection(myself->connection, false);
 900                 free_connection(myself->connection);
 901         }
 902
 903         for(int i = 0; i < listen_sockets; i++) {
 904                 io_del(&listen_socket[i].tcp);
 905                 io_del(&listen_socket[i].udp);
 906                 close(listen_socket[i].tcp.fd);
 907                 close(listen_socket[i].udp.fd);
 908         }
 909
 910         exit_requests();
 911         exit_edges();
 912         exit_nodes();
 913         exit_connections();
 914
 915         if(myport) free(myport);
 916
 917         return;
 918 }