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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 2014 Guus Sliepen <guus@meshlink.io>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License along
  16     with this program; if not, write to the Free Software Foundation, Inc.,
  17     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "system.h"
  21
  22 #include "cipher.h"
  23 #include "conf.h"
  24 #include "connection.h"
  25 #include "digest.h"
  26 #include "ecdsa.h"
  27 #include "graph.h"
  28 #include "logger.h"
  29 #include "net.h"
  30 #include "netutl.h"
  31 #include "protocol.h"
  32 #include "route.h"
  33 #include "rsa.h"
  34 #include "utils.h"
  35 #include "xalloc.h"
  36
  37 char *myport;
  38
  39 char *proxyhost;
  40 char *proxyport;
  41 char *proxyuser;
  42 char *proxypass;
  43 proxytype_t proxytype;
  44 int autoconnect;
  45 bool disablebuggypeers;
  46
  47 bool node_read_ecdsa_public_key(node_t *n) {
  48         if(ecdsa_active(n->ecdsa))
  49                 return true;
  50
  51         splay_tree_t *config_tree;
  52         FILE *fp;
  53         char *pubname = NULL;
  54         char *p;
  55
  56         init_configuration(&config_tree);
  57         if(!read_host_config(config_tree, n->name))
  58                 goto exit;
  59
  60         /* First, check for simple ECDSAPublicKey statement */
  61
  62         if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
  63                 n->ecdsa = ecdsa_set_base64_public_key(p);
  64                 free(p);
  65                 goto exit;
  66         }
  67
  68         /* Else, check for ECDSAPublicKeyFile statement and read it */
  69
  70         if(!get_config_string(lookup_config(config_tree, "ECDSAPublicKeyFile"), &pubname))
  71                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  72
  73         fp = fopen(pubname, "r");
  74
  75         if(!fp)
  76                 goto exit;
  77
  78         n->ecdsa = ecdsa_read_pem_public_key(fp);
  79         fclose(fp);
  80
  81 exit:
  82         exit_configuration(&config_tree);
  83         free(pubname);
  84         return n->ecdsa;
  85 }
  86
  87 bool read_ecdsa_public_key(connection_t *c) {
  88         if(ecdsa_active(c->ecdsa))
  89                 return true;
  90
  91         FILE *fp;
  92         char *fname;
  93         char *p;
  94
  95         if(!c->config_tree) {
  96                 init_configuration(&c->config_tree);
  97                 if(!read_host_config(c->config_tree, c->name))
  98                         return false;
  99         }
 100
 101         /* First, check for simple ECDSAPublicKey statement */
 102
 103         if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
 104                 c->ecdsa = ecdsa_set_base64_public_key(p);
 105                 free(p);
 106                 return c->ecdsa;
 107         }
 108
 109         /* Else, check for ECDSAPublicKeyFile statement and read it */
 110
 111         if(!get_config_string(lookup_config(c->config_tree, "ECDSAPublicKeyFile"), &fname))
 112                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 113
 114         fp = fopen(fname, "r");
 115
 116         if(!fp) {
 117                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s",
 118                            fname, strerror(errno));
 119                 free(fname);
 120                 return false;
 121         }
 122
 123         c->ecdsa = ecdsa_read_pem_public_key(fp);
 124         fclose(fp);
 125
 126         if(!c->ecdsa)
 127                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing ECDSA public key file `%s' failed.", fname);
 128         free(fname);
 129         return c->ecdsa;
 130 }
 131
 132 bool read_rsa_public_key(connection_t *c) {
 133         if(ecdsa_active(c->ecdsa))
 134                 return true;
 135
 136         FILE *fp;
 137         char *fname;
 138         char *n;
 139
 140         /* First, check for simple PublicKey statement */
 141
 142         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 143                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 144                 free(n);
 145                 return c->rsa;
 146         }
 147
 148         /* Else, check for PublicKeyFile statement and read it */
 149
 150         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 151                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 152
 153         fp = fopen(fname, "r");
 154
 155         if(!fp) {
 156                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 157                 free(fname);
 158                 return false;
 159         }
 160
 161         c->rsa = rsa_read_pem_public_key(fp);
 162         fclose(fp);
 163
 164         if(!c->rsa)
 165                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 166         free(fname);
 167         return c->rsa;
 168 }
 169
 170 static bool read_ecdsa_private_key(void) {
 171         FILE *fp;
 172         char *fname;
 173
 174         /* Check for PrivateKeyFile statement and read it */
 175
 176         if(!get_config_string(lookup_config(config_tree, "ECDSAPrivateKeyFile"), &fname))
 177                 xasprintf(&fname, "%s" SLASH "ecdsa_key.priv", confbase);
 178
 179         fp = fopen(fname, "r");
 180
 181         if(!fp) {
 182                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA private key file `%s': %s", fname, strerror(errno));
 183                 if(errno == ENOENT)
 184                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an ECDSA keypair with `tinc generate-ecdsa-keys'.");
 185                 free(fname);
 186                 return false;
 187         }
 188
 189 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 190         struct stat s;
 191
 192         if(fstat(fileno(fp), &s)) {
 193                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat ECDSA private key file `%s': %s'", fname, strerror(errno));
 194                 free(fname);
 195                 return false;
 196         }
 197
 198         if(s.st_mode & ~0100700)
 199                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for ECDSA private key file `%s'!", fname);
 200 #endif
 201
 202         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 203         fclose(fp);
 204
 205         if(!myself->connection->ecdsa)
 206                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 207         free(fname);
 208         return myself->connection->ecdsa;
 209 }
 210
 211 static bool read_invitation_key(void) {
 212         FILE *fp;
 213         char *fname;
 214
 215         if(invitation_key) {
 216                 ecdsa_free(invitation_key);
 217                 invitation_key = NULL;
 218         }
 219
 220         xasprintf(&fname, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", confbase);
 221
 222         fp = fopen(fname, "r");
 223
 224         if(fp) {
 225                 invitation_key = ecdsa_read_pem_private_key(fp);
 226                 fclose(fp);
 227                 if(!invitation_key)
 228                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 229         }
 230
 231         free(fname);
 232         return invitation_key;
 233 }
 234
 235 static bool read_rsa_private_key(void) {
 236         FILE *fp;
 237         char *fname;
 238         char *n, *d;
 239
 240         /* First, check for simple PrivateKey statement */
 241
 242         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 243                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 244                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 245                         free(d);
 246                         return false;
 247                 }
 248                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 249                 free(n);
 250                 free(d);
 251                 return myself->connection->rsa;
 252         }
 253
 254         /* Else, check for PrivateKeyFile statement and read it */
 255
 256         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 257                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 258
 259         fp = fopen(fname, "r");
 260
 261         if(!fp) {
 262                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 263                            fname, strerror(errno));
 264                 free(fname);
 265                 return false;
 266         }
 267
 268 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 269         struct stat s;
 270
 271         if(fstat(fileno(fp), &s)) {
 272                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 273                 free(fname);
 274                 return false;
 275         }
 276
 277         if(s.st_mode & ~0100700)
 278                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 279 #endif
 280
 281         myself->connection->rsa = rsa_read_pem_private_key(fp);
 282         fclose(fp);
 283
 284         if(!myself->connection->rsa)
 285                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 286         free(fname);
 287         return myself->connection->rsa;
 288 }
 289
 290 static timeout_t keyexpire_timeout;
 291
 292 static void keyexpire_handler(void *data) {
 293         regenerate_key();
 294         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 295 }
 296
 297 void regenerate_key(void) {
 298         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 299         send_key_changed();
 300 }
 301
 302 void load_all_nodes(void) {
 303         DIR *dir;
 304         struct dirent *ent;
 305         char *dname;
 306
 307         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 308         dir = opendir(dname);
 309         if(!dir) {
 310                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 311                 free(dname);
 312                 return;
 313         }
 314
 315         while((ent = readdir(dir))) {
 316                 if(!check_id(ent->d_name))
 317                         continue;
 318
 319                 node_t *n = lookup_node(ent->d_name);
 320                 if(n)
 321                         continue;
 322
 323                 n = new_node();
 324                 n->name = xstrdup(ent->d_name);
 325                 node_add(n);
 326         }
 327
 328         closedir(dir);
 329 }
 330
 331
 332 char *get_name(void) {
 333         char *name = NULL;
 334
 335         get_config_string(lookup_config(config_tree, "Name"), &name);
 336
 337         if(!name)
 338                 return NULL;
 339
 340         if(*name == '$') {
 341                 char *envname = getenv(name + 1);
 342                 char hostname[32] = "";
 343                 if(!envname) {
 344                         if(strcmp(name + 1, "HOST")) {
 345                                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1);
 346                                 return false;
 347                         }
 348                         if(gethostname(hostname, sizeof hostname) || !*hostname) {
 349                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", strerror(errno));
 350                                 return false;
 351                         }
 352                         hostname[31] = 0;
 353                         envname = hostname;
 354                 }
 355                 free(name);
 356                 name = xstrdup(envname);
 357                 for(char *c = name; *c; c++)
 358                         if(!isalnum(*c))
 359                                 *c = '_';
 360         }
 361
 362         if(!check_id(name)) {
 363                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
 364                 free(name);
 365                 return false;
 366         }
 367
 368         return name;
 369 }
 370
 371 bool setup_myself_reloadable(void) {
 372         char *proxy = NULL;
 373         char *rmode = NULL;
 374         char *fmode = NULL;
 375         char *bmode = NULL;
 376         char *afname = NULL;
 377         char *address = NULL;
 378         char *space;
 379         bool choice;
 380
 381         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 382         if(proxy) {
 383                 if((space = strchr(proxy, ' ')))
 384                         *space++ = 0;
 385
 386                 if(!strcasecmp(proxy, "none")) {
 387                         proxytype = PROXY_NONE;
 388                 } else if(!strcasecmp(proxy, "socks4")) {
 389                         proxytype = PROXY_SOCKS4;
 390                 } else if(!strcasecmp(proxy, "socks4a")) {
 391                         proxytype = PROXY_SOCKS4A;
 392                 } else if(!strcasecmp(proxy, "socks5")) {
 393                         proxytype = PROXY_SOCKS5;
 394                 } else if(!strcasecmp(proxy, "http")) {
 395                         proxytype = PROXY_HTTP;
 396                 } else if(!strcasecmp(proxy, "exec")) {
 397                         proxytype = PROXY_EXEC;
 398                 } else {
 399                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 400                         return false;
 401                 }
 402
 403                 switch(proxytype) {
 404                         case PROXY_NONE:
 405                         default:
 406                                 break;
 407
 408                         case PROXY_EXEC:
 409                                 if(!space || !*space) {
 410                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 411                                         return false;
 412                                 }
 413                                 proxyhost =  xstrdup(space);
 414                                 break;
 415
 416                         case PROXY_SOCKS4:
 417                         case PROXY_SOCKS4A:
 418                         case PROXY_SOCKS5:
 419                         case PROXY_HTTP:
 420                                 proxyhost = space;
 421                                 if(space && (space = strchr(space, ' ')))
 422                                         *space++ = 0, proxyport = space;
 423                                 if(space && (space = strchr(space, ' ')))
 424                                         *space++ = 0, proxyuser = space;
 425                                 if(space && (space = strchr(space, ' ')))
 426                                         *space++ = 0, proxypass = space;
 427                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 428                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 429                                         return false;
 430                                 }
 431                                 proxyhost = xstrdup(proxyhost);
 432                                 proxyport = xstrdup(proxyport);
 433                                 if(proxyuser && *proxyuser)
 434                                         proxyuser = xstrdup(proxyuser);
 435                                 if(proxypass && *proxypass)
 436                                         proxypass = xstrdup(proxypass);
 437                                 break;
 438                 }
 439
 440                 free(proxy);
 441         }
 442
 443         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 444                 myself->options |= OPTION_INDIRECT;
 445
 446         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 447                 myself->options |= OPTION_TCPONLY;
 448
 449         if(myself->options & OPTION_TCPONLY)
 450                 myself->options |= OPTION_INDIRECT;
 451
 452         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 453         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 454
 455         memset(&localdiscovery_address, 0, sizeof localdiscovery_address);
 456         if(get_config_string(lookup_config(config_tree, "LocalDiscoveryAddress"), &address)) {
 457                 struct addrinfo *ai = str2addrinfo(address, myport, SOCK_DGRAM);
 458                 free(address);
 459                 if(!ai)
 460                         return false;
 461                 memcpy(&localdiscovery_address, ai->ai_addr, ai->ai_addrlen);
 462         }
 463
 464
 465         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 466                 if(!strcasecmp(rmode, "router"))
 467                         routing_mode = RMODE_ROUTER;
 468                 else if(!strcasecmp(rmode, "switch"))
 469                         routing_mode = RMODE_SWITCH;
 470                 else if(!strcasecmp(rmode, "hub"))
 471                         routing_mode = RMODE_HUB;
 472                 else {
 473                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 474                         return false;
 475                 }
 476                 free(rmode);
 477         }
 478
 479         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 480                 if(!strcasecmp(fmode, "off"))
 481                         forwarding_mode = FMODE_OFF;
 482                 else if(!strcasecmp(fmode, "internal"))
 483                         forwarding_mode = FMODE_INTERNAL;
 484                 else if(!strcasecmp(fmode, "kernel"))
 485                         forwarding_mode = FMODE_KERNEL;
 486                 else {
 487                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 488                         return false;
 489                 }
 490                 free(fmode);
 491         }
 492
 493         choice = true;
 494         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 495         if(choice)
 496                 myself->options |= OPTION_PMTU_DISCOVERY;
 497
 498         choice = true;
 499         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 500         if(choice)
 501                 myself->options |= OPTION_CLAMP_MSS;
 502
 503         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 504         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 505         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 506                 if(!strcasecmp(bmode, "no"))
 507                         broadcast_mode = BMODE_NONE;
 508                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 509                         broadcast_mode = BMODE_MST;
 510                 else if(!strcasecmp(bmode, "direct"))
 511                         broadcast_mode = BMODE_DIRECT;
 512                 else {
 513                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 514                         return false;
 515                 }
 516                 free(bmode);
 517         }
 518
 519 #if !defined(SOL_IP) || !defined(IP_TOS)
 520         if(priorityinheritance)
 521                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 522 #endif
 523
 524         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 525                 macexpire = 600;
 526
 527         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 528                 if(maxtimeout <= 0) {
 529                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 530                         return false;
 531                 }
 532         } else
 533                 maxtimeout = 900;
 534
 535         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 536                 if(!strcasecmp(afname, "IPv4"))
 537                         addressfamily = AF_INET;
 538                 else if(!strcasecmp(afname, "IPv6"))
 539                         addressfamily = AF_INET6;
 540                 else if(!strcasecmp(afname, "any"))
 541                         addressfamily = AF_UNSPEC;
 542                 else {
 543                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 544                         return false;
 545                 }
 546                 free(afname);
 547         }
 548
 549         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 550
 551         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 552                 keylifetime = 3600;
 553
 554         get_config_int(lookup_config(config_tree, "AutoConnect"), &autoconnect);
 555         if(autoconnect < 0)
 556                 autoconnect = 0;
 557
 558         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 559
 560         read_invitation_key();
 561
 562         return true;
 563 }
 564
 565 /*
 566   Add listening sockets.
 567 */
 568 static bool add_listen_address(char *address, bool bindto) {
 569         char *port = myport;
 570
 571         if(address) {
 572                 char *space = strchr(address, ' ');
 573                 if(space) {
 574                         *space++ = 0;
 575                         port = space;
 576                 }
 577
 578                 if(!strcmp(address, "*"))
 579                         *address = 0;
 580         }
 581
 582         struct addrinfo *ai, hint = {0};
 583         hint.ai_family = addressfamily;
 584         hint.ai_socktype = SOCK_STREAM;
 585         hint.ai_protocol = IPPROTO_TCP;
 586         hint.ai_flags = AI_PASSIVE;
 587
 588         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 589         free(address);
 590
 591         if(err || !ai) {
 592                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 593                 return false;
 594         }
 595
 596         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 597                 // Ignore duplicate addresses
 598                 bool found = false;
 599
 600                 for(int i = 0; i < listen_sockets; i++)
 601                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 602                                 found = true;
 603                                 break;
 604                         }
 605
 606                 if(found)
 607                         continue;
 608
 609                 if(listen_sockets >= MAXSOCKETS) {
 610                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 611                         return false;
 612                 }
 613
 614                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 615
 616                 if(tcp_fd < 0)
 617                         continue;
 618
 619                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 620
 621                 if(tcp_fd < 0) {
 622                         close(tcp_fd);
 623                         continue;
 624                 }
 625
 626                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 627                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 628
 629                 if(debug_level >= DEBUG_CONNECTIONS) {
 630                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 631                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 632                         free(hostname);
 633                 }
 634
 635                 listen_socket[listen_sockets].bindto = bindto;
 636                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 637                 listen_sockets++;
 638         }
 639
 640         freeaddrinfo(ai);
 641         return true;
 642 }
 643
 644 /*
 645   Configure node_t myself and set up the local sockets (listen only)
 646 */
 647 bool setup_myself(void) {
 648         char *name, *hostname, *cipher, *digest, *type;
 649         char *address = NULL;
 650         bool port_specified = false;
 651
 652         if(!(name = get_name())) {
 653                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 654                 return false;
 655         }
 656
 657         myself = new_node();
 658         myself->connection = new_connection();
 659         myself->name = name;
 660         myself->connection->name = xstrdup(name);
 661         read_host_config(config_tree, name);
 662
 663         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 664                 myport = xstrdup("655");
 665         else
 666                 port_specified = true;
 667
 668         myself->connection->options = 0;
 669         myself->connection->protocol_major = PROT_MAJOR;
 670         myself->connection->protocol_minor = PROT_MINOR;
 671
 672         myself->options |= PROT_MINOR << 24;
 673
 674         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 675                 experimental = read_ecdsa_private_key();
 676                 if(!experimental)
 677                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 678         } else {
 679                 if(experimental && !read_ecdsa_private_key())
 680                         return false;
 681         }
 682
 683         if(!read_rsa_private_key())
 684                 return false;
 685
 686         /* Ensure myport is numeric */
 687
 688         if(!atoi(myport)) {
 689                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 690                 sockaddr_t sa;
 691                 if(!ai || !ai->ai_addr)
 692                         return false;
 693                 free(myport);
 694                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 695                 sockaddr2str(&sa, NULL, &myport);
 696         }
 697
 698         /* Check some options */
 699
 700         if(!setup_myself_reloadable())
 701                 return false;
 702
 703         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 704                 if(max_connection_burst <= 0) {
 705                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 706                         return false;
 707                 }
 708         }
 709
 710         int replaywin_int;
 711         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 712                 if(replaywin_int < 0) {
 713                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 714                         return false;
 715                 }
 716                 replaywin = (unsigned)replaywin_int;
 717                 sptps_replaywin = replaywin;
 718         }
 719
 720         /* Generate packet encryption key */
 721
 722         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 723                 cipher = xstrdup("blowfish");
 724
 725         if(!strcasecmp(cipher, "none")) {
 726                 myself->incipher = NULL;
 727         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 728                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 729                 return false;
 730         }
 731
 732         free(cipher);
 733
 734         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 735
 736         /* Check if we want to use message authentication codes... */
 737
 738         int maclength = 4;
 739         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 740
 741         if(maclength < 0) {
 742                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 743                 return false;
 744         }
 745
 746         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 747                 digest = xstrdup("sha1");
 748
 749         if(!strcasecmp(digest, "none")) {
 750                 myself->indigest = NULL;
 751         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 752                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 753                 return false;
 754         }
 755
 756         free(digest);
 757
 758         /* Compression */
 759
 760         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 761                 if(myself->incompression < 0 || myself->incompression > 11) {
 762                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 763                         return false;
 764                 }
 765         } else
 766                 myself->incompression = 0;
 767
 768         myself->connection->outcompression = 0;
 769
 770         /* Done */
 771
 772         myself->nexthop = myself;
 773         myself->via = myself;
 774         myself->status.reachable = true;
 775         myself->last_state_change = now.tv_sec;
 776         myself->status.sptps = experimental;
 777         node_add(myself);
 778
 779         graph();
 780
 781         if(autoconnect)
 782                 load_all_nodes();
 783
 784         /* Open sockets */
 785
 786         listen_sockets = 0;
 787         int cfgs = 0;
 788
 789         for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 790                 cfgs++;
 791                 get_config_string(cfg, &address);
 792                 if(!add_listen_address(address, true))
 793                         return false;
 794         }
 795
 796         for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 797                 cfgs++;
 798                 get_config_string(cfg, &address);
 799                 if(!add_listen_address(address, false))
 800                         return false;
 801         }
 802
 803         if(!cfgs)
 804                 if(!add_listen_address(address, NULL))
 805                         return false;
 806
 807         if(!listen_sockets) {
 808                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
 809                 return false;
 810         }
 811
 812         /* If no Port option was specified, set myport to the port used by the first listening socket. */
 813
 814         if(!port_specified) {
 815                 sockaddr_t sa;
 816                 socklen_t salen = sizeof sa;
 817                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
 818                         free(myport);
 819                         sockaddr2str(&sa, NULL, &myport);
 820                         if(!myport)
 821                                 myport = xstrdup("655");
 822                 }
 823         }
 824
 825         xasprintf(&myself->hostname, "MYSELF port %s", myport);
 826         myself->connection->hostname = xstrdup(myself->hostname);
 827
 828         /* Done. */
 829
 830         last_config_check = now.tv_sec;
 831
 832         return true;
 833 }
 834
 835 /*
 836   initialize network
 837 */
 838 bool setup_network(void) {
 839         init_connections();
 840         init_nodes();
 841         init_edges();
 842         init_requests();
 843
 844         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 845                 if(pinginterval < 1) {
 846                         pinginterval = 86400;
 847                 }
 848         } else
 849                 pinginterval = 60;
 850
 851         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 852                 pingtimeout = 5;
 853         if(pingtimeout < 1 || pingtimeout > pinginterval)
 854                 pingtimeout = pinginterval;
 855
 856         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 857                 maxoutbufsize = 10 * MTU;
 858
 859         if(!setup_myself())
 860                 return false;
 861
 862         return true;
 863 }
 864
 865 /*
 866   close all open network connections
 867 */
 868 void close_network_connections(void) {
 869         for(list_node_t *node = connection_list->head, *next; node; node = next) {
 870                 next = node->next;
 871                 connection_t *c = node->data;
 872                 c->outgoing = NULL;
 873                 terminate_connection(c, false);
 874         }
 875
 876         if(outgoing_list)
 877                 list_delete_list(outgoing_list);
 878
 879         if(myself && myself->connection) {
 880                 terminate_connection(myself->connection, false);
 881                 free_connection(myself->connection);
 882         }
 883
 884         for(int i = 0; i < listen_sockets; i++) {
 885                 io_del(&listen_socket[i].tcp);
 886                 io_del(&listen_socket[i].udp);
 887                 close(listen_socket[i].tcp.fd);
 888                 close(listen_socket[i].udp.fd);
 889         }
 890
 891         exit_requests();
 892         exit_edges();
 893         exit_nodes();
 894         exit_connections();
 895
 896         if(myport) free(myport);
 897
 898         return;
 899 }