tinc-vpn.org Git - tinc/blob - src/net_setup.c

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2012 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 "splay_tree.h"
  26 #include "cipher.h"
  27 #include "conf.h"
  28 #include "connection.h"
  29 #include "control.h"
  30 #include "device.h"
  31 #include "digest.h"
  32 #include "ecdsa.h"
  33 #include "graph.h"
  34 #include "logger.h"
  35 #include "net.h"
  36 #include "netutl.h"
  37 #include "process.h"
  38 #include "protocol.h"
  39 #include "route.h"
  40 #include "rsa.h"
  41 #include "subnet.h"
  42 #include "utils.h"
  43 #include "xalloc.h"
  44
  45 char *myport;
  46 static struct event device_ev;
  47 devops_t devops;
  48
  49 char *proxyhost;
  50 char *proxyport;
  51 char *proxyuser;
  52 char *proxypass;
  53 proxytype_t proxytype;
  54
  55 bool node_read_ecdsa_public_key(node_t *n) {
  56         if(ecdsa_active(&n->ecdsa))
  57                 return true;
  58
  59         splay_tree_t *config_tree;
  60         FILE *fp;
  61         char *fname;
  62         char *p;
  63         bool result = false;
  64
  65         xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  66
  67         init_configuration(&config_tree);
  68         if(!read_config_file(config_tree, fname))
  69                 goto exit;
  70
  71         /* First, check for simple ECDSAPublicKey statement */
  72
  73         if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
  74                 result = ecdsa_set_base64_public_key(&n->ecdsa, p);
  75                 free(p);
  76                 goto exit;
  77         }
  78
  79         /* Else, check for ECDSAPublicKeyFile statement and read it */
  80
  81         free(fname);
  82
  83         if(!get_config_string(lookup_config(config_tree, "ECDSAPublicKeyFile"), &fname))
  84                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  85
  86         fp = fopen(fname, "r");
  87
  88         if(!fp) {
  89                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s", fname, strerror(errno));
  90                 goto exit;
  91         }
  92
  93         result = ecdsa_read_pem_public_key(&n->ecdsa, fp);
  94         fclose(fp);
  95
  96 exit:
  97         exit_configuration(&config_tree);
  98         free(fname);
  99         return result;
 100 }
 101
 102 bool read_ecdsa_public_key(connection_t *c) {
 103         FILE *fp;
 104         char *fname;
 105         char *p;
 106         bool result;
 107
 108         /* First, check for simple ECDSAPublicKey statement */
 109
 110         if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
 111                 result = ecdsa_set_base64_public_key(&c->ecdsa, p);
 112                 free(p);
 113                 return result;
 114         }
 115
 116         /* Else, check for ECDSAPublicKeyFile statement and read it */
 117
 118         if(!get_config_string(lookup_config(c->config_tree, "ECDSAPublicKeyFile"), &fname))
 119                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 120
 121         fp = fopen(fname, "r");
 122
 123         if(!fp) {
 124                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s",
 125                            fname, strerror(errno));
 126                 free(fname);
 127                 return false;
 128         }
 129
 130         result = ecdsa_read_pem_public_key(&c->ecdsa, fp);
 131         fclose(fp);
 132
 133         if(!result)
 134                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing ECDSA public key file `%s' failed.", fname);
 135         free(fname);
 136         return result;
 137 }
 138
 139 bool read_rsa_public_key(connection_t *c) {
 140         FILE *fp;
 141         char *fname;
 142         char *n;
 143         bool result;
 144
 145         /* First, check for simple PublicKey statement */
 146
 147         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 148                 result = rsa_set_hex_public_key(&c->rsa, n, "FFFF");
 149                 free(n);
 150                 return result;
 151         }
 152
 153         /* Else, check for PublicKeyFile statement and read it */
 154
 155         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 156                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 157
 158         fp = fopen(fname, "r");
 159
 160         if(!fp) {
 161                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 162                 free(fname);
 163                 return false;
 164         }
 165
 166         result = rsa_read_pem_public_key(&c->rsa, fp);
 167         fclose(fp);
 168
 169         if(!result)
 170                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 171         free(fname);
 172         return result;
 173 }
 174
 175 static bool read_ecdsa_private_key(void) {
 176         FILE *fp;
 177         char *fname;
 178         bool result;
 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                 free(fname);
 190                 return false;
 191         }
 192
 193 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 194         struct stat s;
 195
 196         if(fstat(fileno(fp), &s)) {
 197                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat ECDSA private key file `%s': %s'", fname, strerror(errno));
 198                 free(fname);
 199                 return false;
 200         }
 201
 202         if(s.st_mode & ~0100700)
 203                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for ECDSA private key file `%s'!", fname);
 204 #endif
 205
 206         result = ecdsa_read_pem_private_key(&myself->connection->ecdsa, fp);
 207         fclose(fp);
 208
 209         if(!result)
 210                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 211         free(fname);
 212         return result;
 213 }
 214
 215 static bool read_rsa_private_key(void) {
 216         FILE *fp;
 217         char *fname;
 218         char *n, *d;
 219         bool result;
 220
 221         /* First, check for simple PrivateKey statement */
 222
 223         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 224                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 225                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 226                         free(d);
 227                         return false;
 228                 }
 229                 result = rsa_set_hex_private_key(&myself->connection->rsa, n, "FFFF", d);
 230                 free(n);
 231                 free(d);
 232                 return true;
 233         }
 234
 235         /* Else, check for PrivateKeyFile statement and read it */
 236
 237         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 238                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 239
 240         fp = fopen(fname, "r");
 241
 242         if(!fp) {
 243                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 244                            fname, strerror(errno));
 245                 free(fname);
 246                 return false;
 247         }
 248
 249 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 250         struct stat s;
 251
 252         if(fstat(fileno(fp), &s)) {
 253                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 254                 free(fname);
 255                 return false;
 256         }
 257
 258         if(s.st_mode & ~0100700)
 259                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 260 #endif
 261
 262         result = rsa_read_pem_private_key(&myself->connection->rsa, fp);
 263         fclose(fp);
 264
 265         if(!result)
 266                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 267         free(fname);
 268         return result;
 269 }
 270
 271 static struct event keyexpire_event;
 272
 273 static void keyexpire_handler(int fd, short events, void *data) {
 274         regenerate_key();
 275 }
 276
 277 void regenerate_key(void) {
 278         if(timeout_initialized(&keyexpire_event)) {
 279                 logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 280                 event_del(&keyexpire_event);
 281                 send_key_changed();
 282         } else {
 283                 timeout_set(&keyexpire_event, keyexpire_handler, NULL);
 284         }
 285
 286         event_add(&keyexpire_event, &(struct timeval){keylifetime, 0});
 287 }
 288
 289 /*
 290   Read Subnets from all host config files
 291 */
 292 void load_all_subnets(void) {
 293         DIR *dir;
 294         struct dirent *ent;
 295         char *dname;
 296         char *fname;
 297         splay_tree_t *config_tree;
 298         config_t *cfg;
 299         subnet_t *s, *s2;
 300         node_t *n;
 301
 302         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 303         dir = opendir(dname);
 304         if(!dir) {
 305                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 306                 free(dname);
 307                 return;
 308         }
 309
 310         while((ent = readdir(dir))) {
 311                 if(!check_id(ent->d_name))
 312                         continue;
 313
 314                 n = lookup_node(ent->d_name);
 315                 #ifdef _DIRENT_HAVE_D_TYPE
 316                 //if(ent->d_type != DT_REG)
 317                 //      continue;
 318                 #endif
 319
 320                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, ent->d_name);
 321                 init_configuration(&config_tree);
 322                 read_config_options(config_tree, ent->d_name);
 323                 read_config_file(config_tree, fname);
 324                 free(fname);
 325
 326                 if(!n) {
 327                         n = new_node();
 328                         n->name = xstrdup(ent->d_name);
 329                         node_add(n);
 330                 }
 331
 332                 for(cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 333                         if(!get_config_subnet(cfg, &s))
 334                                 continue;
 335
 336                         if((s2 = lookup_subnet(n, s))) {
 337                                 s2->expires = -1;
 338                         } else {
 339                                 subnet_add(n, s);
 340                         }
 341                 }
 342
 343                 exit_configuration(&config_tree);
 344         }
 345
 346         closedir(dir);
 347 }
 348
 349 char *get_name(void) {
 350         char *name = NULL;
 351
 352         get_config_string(lookup_config(config_tree, "Name"), &name);
 353
 354         if(!name)
 355                 return NULL;
 356
 357         if(*name == '$') {
 358                 char *envname = getenv(name + 1);
 359                 if(!envname) {
 360                         if(strcmp(name + 1, "HOST")) {
 361                                 fprintf(stderr, "Invalid Name: environment variable %s does not exist\n", name + 1);
 362                                 return false;
 363                         }
 364                         envname = alloca(32);
 365                         if(gethostname(envname, 32)) {
 366                                 fprintf(stderr, "Could not get hostname: %s\n", strerror(errno));
 367                                 return false;
 368                         }
 369                         envname[31] = 0;
 370                 }
 371                 free(name);
 372                 name = xstrdup(envname);
 373                 for(char *c = name; *c; c++)
 374                         if(!isalnum(*c))
 375                                 *c = '_';
 376         }
 377
 378         if(!check_id(name)) {
 379                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
 380                 free(name);
 381                 return false;
 382         }
 383
 384         return name;
 385 }
 386
 387 bool setup_myself_reloadable(void) {
 388         char *proxy = NULL;
 389         char *mode = NULL;
 390         char *afname = NULL;
 391         char *space;
 392         bool choice;
 393
 394         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 395         if(proxy) {
 396                 if((space = strchr(proxy, ' ')))
 397                         *space++ = 0;
 398
 399                 if(!strcasecmp(proxy, "none")) {
 400                         proxytype = PROXY_NONE;
 401                 } else if(!strcasecmp(proxy, "socks4")) {
 402                         proxytype = PROXY_SOCKS4;
 403                 } else if(!strcasecmp(proxy, "socks4a")) {
 404                         proxytype = PROXY_SOCKS4A;
 405                 } else if(!strcasecmp(proxy, "socks5")) {
 406                         proxytype = PROXY_SOCKS5;
 407                 } else if(!strcasecmp(proxy, "http")) {
 408                         proxytype = PROXY_HTTP;
 409                 } else if(!strcasecmp(proxy, "exec")) {
 410                         proxytype = PROXY_EXEC;
 411                 } else {
 412                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 413                         return false;
 414                 }
 415
 416                 switch(proxytype) {
 417                         case PROXY_NONE:
 418                         default:
 419                                 break;
 420
 421                         case PROXY_EXEC:
 422                                 if(!space || !*space) {
 423                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 424                                         return false;
 425                                 }
 426                                 proxyhost =  xstrdup(space);
 427                                 break;
 428
 429                         case PROXY_SOCKS4:
 430                         case PROXY_SOCKS4A:
 431                         case PROXY_SOCKS5:
 432                         case PROXY_HTTP:
 433                                 proxyhost = space;
 434                                 if(space && (space = strchr(space, ' ')))
 435                                         *space++ = 0, proxyport = space;
 436                                 if(space && (space = strchr(space, ' ')))
 437                                         *space++ = 0, proxyuser = space;
 438                                 if(space && (space = strchr(space, ' ')))
 439                                         *space++ = 0, proxypass = space;
 440                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 441                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 442                                         return false;
 443                                 }
 444                                 proxyhost = xstrdup(proxyhost);
 445                                 proxyport = xstrdup(proxyport);
 446                                 if(proxyuser && *proxyuser)
 447                                         proxyuser = xstrdup(proxyuser);
 448                                 if(proxypass && *proxypass)
 449                                         proxypass = xstrdup(proxypass);
 450                                 break;
 451                 }
 452
 453                 free(proxy);
 454         }
 455
 456         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 457                 myself->options |= OPTION_INDIRECT;
 458
 459         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 460                 myself->options |= OPTION_TCPONLY;
 461
 462         if(myself->options & OPTION_TCPONLY)
 463                 myself->options |= OPTION_INDIRECT;
 464
 465         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 466         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 467
 468         if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
 469                 if(!strcasecmp(mode, "router"))
 470                         routing_mode = RMODE_ROUTER;
 471                 else if(!strcasecmp(mode, "switch"))
 472                         routing_mode = RMODE_SWITCH;
 473                 else if(!strcasecmp(mode, "hub"))
 474                         routing_mode = RMODE_HUB;
 475                 else {
 476                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 477                         return false;
 478                 }
 479                 free(mode);
 480         }
 481
 482         if(get_config_string(lookup_config(config_tree, "Forwarding"), &mode)) {
 483                 if(!strcasecmp(mode, "off"))
 484                         forwarding_mode = FMODE_OFF;
 485                 else if(!strcasecmp(mode, "internal"))
 486                         forwarding_mode = FMODE_INTERNAL;
 487                 else if(!strcasecmp(mode, "kernel"))
 488                         forwarding_mode = FMODE_KERNEL;
 489                 else {
 490                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 491                         return false;
 492                 }
 493                 free(mode);
 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"), &mode)) {
 509                 if(!strcasecmp(mode, "no"))
 510                         broadcast_mode = BMODE_NONE;
 511                 else if(!strcasecmp(mode, "yes") || !strcasecmp(mode, "mst"))
 512                         broadcast_mode = BMODE_MST;
 513                 else if(!strcasecmp(mode, "direct"))
 514                         broadcast_mode = BMODE_DIRECT;
 515                 else {
 516                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 517                         return false;
 518                 }
 519                 free(mode);
 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         return true;
 558 }
 559
 560 /*
 561   Configure node_t myself and set up the local sockets (listen only)
 562 */
 563 static bool setup_myself(void) {
 564         config_t *cfg;
 565         subnet_t *subnet;
 566         char *name, *hostname, *cipher, *digest, *type;
 567         char *fname = NULL;
 568         char *address = NULL;
 569         char *envp[5];
 570         struct addrinfo *ai, *aip, hint = {0};
 571         int i, err;
 572         int replaywin_int;
 573
 574         myself = new_node();
 575         myself->connection = new_connection();
 576
 577         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 578                 myport = xstrdup("655");
 579
 580         xasprintf(&myself->hostname, "MYSELF port %s", myport);
 581         myself->connection->hostname = xstrdup(myself->hostname);
 582
 583         myself->connection->options = 0;
 584         myself->connection->protocol_major = PROT_MAJOR;
 585         myself->connection->protocol_minor = PROT_MINOR;
 586
 587         myself->options |= PROT_MINOR << 24;
 588
 589         if(!(name = get_name())) {
 590                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 591                 return false;
 592         }
 593
 594         myself->name = name;
 595         myself->connection->name = xstrdup(name);
 596         xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 597         read_config_options(config_tree, name);
 598         read_config_file(config_tree, fname);
 599         free(fname);
 600
 601         get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental);
 602
 603         if(experimental && !read_ecdsa_private_key())
 604                 return false;
 605
 606         if(!read_rsa_private_key())
 607                 return false;
 608
 609         if(!atoi(myport)) {
 610                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 611                 sockaddr_t sa;
 612                 if(!ai || !ai->ai_addr)
 613                         return false;
 614                 free(myport);
 615                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 616                 sockaddr2str(&sa, NULL, &myport);
 617         }
 618
 619         /* Read in all the subnets specified in the host configuration file */
 620
 621         cfg = lookup_config(config_tree, "Subnet");
 622
 623         while(cfg) {
 624                 if(!get_config_subnet(cfg, &subnet))
 625                         return false;
 626
 627                 subnet_add(myself, subnet);
 628
 629                 cfg = lookup_config_next(config_tree, cfg);
 630         }
 631
 632         /* Check some options */
 633
 634         if(!setup_myself_reloadable())
 635                 return false;
 636
 637         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 638         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 639         strictsubnets |= tunnelserver;
 640
 641
 642
 643         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 644                 if(udp_rcvbuf <= 0) {
 645                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 646                         return false;
 647                 }
 648         }
 649
 650         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 651                 if(udp_sndbuf <= 0) {
 652                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 653                         return false;
 654                 }
 655         }
 656
 657         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 658                 if(replaywin_int < 0) {
 659                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 660                         return false;
 661                 }
 662                 replaywin = (unsigned)replaywin_int;
 663         }
 664
 665         /* Generate packet encryption key */
 666
 667         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 668                 cipher = xstrdup("blowfish");
 669
 670         if(!cipher_open_by_name(&myself->incipher, cipher)) {
 671                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 672                 return false;
 673         }
 674
 675         regenerate_key();
 676
 677         /* Check if we want to use message authentication codes... */
 678
 679         int maclength = 4;
 680         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 681
 682         if(maclength < 0) {
 683                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 684                 return false;
 685         }
 686
 687         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 688                 digest = xstrdup("sha1");
 689
 690         if(!digest_open_by_name(&myself->indigest, digest, maclength)) {
 691                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 692                 return false;
 693         }
 694
 695         /* Compression */
 696
 697         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 698                 if(myself->incompression < 0 || myself->incompression > 11) {
 699                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 700                         return false;
 701                 }
 702         } else
 703                 myself->incompression = 0;
 704
 705         myself->connection->outcompression = 0;
 706
 707         /* Done */
 708
 709         myself->nexthop = myself;
 710         myself->via = myself;
 711         myself->status.reachable = true;
 712         myself->last_state_change = time(NULL);
 713         myself->status.sptps = experimental;
 714         node_add(myself);
 715
 716         graph();
 717
 718         if(strictsubnets)
 719                 load_all_subnets();
 720
 721         /* Open device */
 722
 723         devops = os_devops;
 724
 725         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 726                 if(!strcasecmp(type, "dummy"))
 727                         devops = dummy_devops;
 728                 else if(!strcasecmp(type, "raw_socket"))
 729                         devops = raw_socket_devops;
 730                 else if(!strcasecmp(type, "multicast"))
 731                         devops = multicast_devops;
 732 #ifdef ENABLE_UML
 733                 else if(!strcasecmp(type, "uml"))
 734                         devops = uml_devops;
 735 #endif
 736 #ifdef ENABLE_VDE
 737                 else if(!strcasecmp(type, "vde"))
 738                         devops = vde_devops;
 739 #endif
 740         }
 741
 742         if(!devops.setup())
 743                 return false;
 744
 745         if(device_fd >= 0) {
 746                 event_set(&device_ev, device_fd, EV_READ|EV_PERSIST, handle_device_data, NULL);
 747
 748                 if (event_add(&device_ev, NULL) < 0) {
 749                         logger(DEBUG_ALWAYS, LOG_ERR, "event_add failed: %s", strerror(errno));
 750                         devops.close();
 751                         return false;
 752                 }
 753         }
 754
 755         /* Run tinc-up script to further initialize the tap interface */
 756         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 757         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 758         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 759         xasprintf(&envp[3], "NAME=%s", myself->name);
 760         envp[4] = NULL;
 761
 762         execute_script("tinc-up", envp);
 763
 764         for(i = 0; i < 4; i++)
 765                 free(envp[i]);
 766
 767         /* Run subnet-up scripts for our own subnets */
 768
 769         subnet_update(myself, NULL, true);
 770
 771         /* Open sockets */
 772
 773         if(!do_detach && getenv("LISTEN_FDS")) {
 774                 sockaddr_t sa;
 775                 socklen_t salen;
 776
 777                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 778 #ifdef HAVE_UNSETENV
 779                 unsetenv("LISTEN_FDS");
 780 #endif
 781
 782                 if(listen_sockets > MAXSOCKETS) {
 783                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 784                         return false;
 785                 }
 786
 787                 for(i = 0; i < listen_sockets; i++) {
 788                         salen = sizeof sa;
 789                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 790                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
 791                                 return false;
 792                         }
 793
 794                         listen_socket[i].tcp = i + 3;
 795
 796 #ifdef FD_CLOEXEC
 797                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 798 #endif
 799
 800                         listen_socket[i].udp = setup_vpn_in_socket(&sa);
 801                         if(listen_socket[i].udp < 0)
 802                                 return false;
 803
 804                         event_set(&listen_socket[i].ev_tcp, listen_socket[i].tcp, EV_READ|EV_PERSIST, handle_new_meta_connection, NULL);
 805                         if(event_add(&listen_socket[i].ev_tcp, NULL) < 0) {
 806                                 logger(DEBUG_ALWAYS, LOG_ERR, "event_add failed: %s", strerror(errno));
 807                                 abort();
 808                         }
 809
 810                         event_set(&listen_socket[i].ev_udp, listen_socket[i].udp, EV_READ|EV_PERSIST, handle_incoming_vpn_data, (void *)(intptr_t)listen_sockets);
 811                         if(event_add(&listen_socket[listen_sockets].ev_udp, NULL) < 0) {
 812                                 logger(DEBUG_ALWAYS, LOG_ERR, "event_add failed: %s", strerror(errno));
 813                                 abort();
 814                         }
 815
 816                         if(debug_level >= DEBUG_CONNECTIONS) {
 817                                 hostname = sockaddr2hostname(&sa);
 818                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 819                                 free(hostname);
 820                         }
 821
 822                         memcpy(&listen_socket[i].sa, &sa, salen);
 823                 }
 824         } else {
 825                 listen_sockets = 0;
 826                 cfg = lookup_config(config_tree, "BindToAddress");
 827
 828                 do {
 829                         get_config_string(cfg, &address);
 830                         if(cfg)
 831                                 cfg = lookup_config_next(config_tree, cfg);
 832
 833                         char *port = myport;
 834
 835                         if(address) {
 836                                 char *space = strchr(address, ' ');
 837                                 if(space) {
 838                                         *space++ = 0;
 839                                         port = space;
 840                                 }
 841
 842                                 if(!strcmp(address, "*"))
 843                                         *address = 0;
 844                         }
 845
 846                         hint.ai_family = addressfamily;
 847                         hint.ai_socktype = SOCK_STREAM;
 848                         hint.ai_protocol = IPPROTO_TCP;
 849                         hint.ai_flags = AI_PASSIVE;
 850
 851                         err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 852                         free(address);
 853
 854                         if(err || !ai) {
 855                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
 856                                            gai_strerror(err));
 857                                 return false;
 858                         }
 859
 860                         for(aip = ai; aip; aip = aip->ai_next) {
 861                                 if(listen_sockets >= MAXSOCKETS) {
 862                                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 863                                         return false;
 864                                 }
 865
 866                                 listen_socket[listen_sockets].tcp =
 867                                         setup_listen_socket((sockaddr_t *) aip->ai_addr);
 868
 869                                 if(listen_socket[listen_sockets].tcp < 0)
 870                                         continue;
 871
 872                                 listen_socket[listen_sockets].udp =
 873                                         setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 874
 875                                 if(listen_socket[listen_sockets].udp < 0) {
 876                                         close(listen_socket[listen_sockets].tcp);
 877                                         continue;
 878                                 }
 879
 880                                 event_set(&listen_socket[listen_sockets].ev_tcp,
 881                                                   listen_socket[listen_sockets].tcp,
 882                                                   EV_READ|EV_PERSIST,
 883                                                   handle_new_meta_connection, NULL);
 884                                 if(event_add(&listen_socket[listen_sockets].ev_tcp, NULL) < 0) {
 885                                         logger(DEBUG_ALWAYS, LOG_ERR, "event_add failed: %s", strerror(errno));
 886                                         abort();
 887                                 }
 888
 889                                 event_set(&listen_socket[listen_sockets].ev_udp,
 890                                                   listen_socket[listen_sockets].udp,
 891                                                   EV_READ|EV_PERSIST,
 892                                                   handle_incoming_vpn_data, (void *)(intptr_t)listen_sockets);
 893                                 if(event_add(&listen_socket[listen_sockets].ev_udp, NULL) < 0) {
 894                                         logger(DEBUG_ALWAYS, LOG_ERR, "event_add failed: %s", strerror(errno));
 895                                         abort();
 896                                 }
 897
 898                                 if(debug_level >= DEBUG_CONNECTIONS) {
 899                                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 900                                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 901                                         free(hostname);
 902                                 }
 903
 904                                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 905                                 listen_sockets++;
 906                         }
 907
 908                         freeaddrinfo(ai);
 909                 } while(cfg);
 910         }
 911
 912         if(listen_sockets)
 913                 logger(DEBUG_ALWAYS, LOG_NOTICE, "Ready");
 914         else {
 915                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
 916                 return false;
 917         }
 918
 919         last_config_check = time(NULL);
 920
 921         return true;
 922 }
 923
 924 /*
 925   initialize network
 926 */
 927 bool setup_network(void) {
 928         init_connections();
 929         init_subnets();
 930         init_nodes();
 931         init_edges();
 932         init_requests();
 933
 934         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 935                 if(pinginterval < 1) {
 936                         pinginterval = 86400;
 937                 }
 938         } else
 939                 pinginterval = 60;
 940
 941         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 942                 pingtimeout = 5;
 943         if(pingtimeout < 1 || pingtimeout > pinginterval)
 944                 pingtimeout = pinginterval;
 945
 946         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 947                 maxoutbufsize = 10 * MTU;
 948
 949         if(!setup_myself())
 950                 return false;
 951
 952         return true;
 953 }
 954
 955 /*
 956   close all open network connections
 957 */
 958 void close_network_connections(void) {
 959         splay_node_t *node, *next;
 960         connection_t *c;
 961         char *envp[5];
 962         int i;
 963
 964         for(node = connection_tree->head; node; node = next) {
 965                 next = node->next;
 966                 c = node->data;
 967                 c->outgoing = NULL;
 968                 terminate_connection(c, false);
 969         }
 970
 971         list_delete_list(outgoing_list);
 972
 973         if(myself && myself->connection) {
 974                 subnet_update(myself, NULL, false);
 975                 terminate_connection(myself->connection, false);
 976                 free_connection(myself->connection);
 977         }
 978
 979         for(i = 0; i < listen_sockets; i++) {
 980                 event_del(&listen_socket[i].ev_tcp);
 981                 event_del(&listen_socket[i].ev_udp);
 982                 close(listen_socket[i].tcp);
 983                 close(listen_socket[i].udp);
 984         }
 985
 986         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 987         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 988         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 989         xasprintf(&envp[3], "NAME=%s", myself->name);
 990         envp[4] = NULL;
 991
 992         exit_requests();
 993         exit_edges();
 994         exit_subnets();
 995         exit_nodes();
 996         exit_connections();
 997
 998         execute_script("tinc-down", envp);
 999
1000         if(myport) free(myport);
1001
1002         for(i = 0; i < 4; i++)
1003                 free(envp[i]);
1004
1005         devops.close();
1006
1007         return;
1008 }