src/tincd.c

   1 /*
   2     tincd.c -- the main file for tincd
   3     Copyright (C) 1998-2005 Ivo Timmermans
   4                   2000-2009 Guus Sliepen <guus@tinc-vpn.org>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20     $Id$
  21 */
  22
  23 #include "system.h"
  24
  25 /* Darwin (MacOS/X) needs the following definition... */
  26 #ifndef _P1003_1B_VISIBLE
  27 #define _P1003_1B_VISIBLE
  28 #endif
  29
  30 #ifdef HAVE_SYS_MMAN_H
  31 #include <sys/mman.h>
  32 #endif
  33
  34 #include <openssl/rand.h>
  35 #include <openssl/rsa.h>
  36 #include <openssl/pem.h>
  37 #include <openssl/evp.h>
  38 #include <openssl/engine.h>
  39
  40 #include LZO1X_H
  41
  42 #include <getopt.h>
  43 #include "pidfile.h"
  44
  45 #include "conf.h"
  46 #include "device.h"
  47 #include "logger.h"
  48 #include "net.h"
  49 #include "netutl.h"
  50 #include "process.h"
  51 #include "protocol.h"
  52 #include "utils.h"
  53 #include "xalloc.h"
  54
  55 /* The name this program was run with. */
  56 char *program_name = NULL;
  57
  58 /* If nonzero, display usage information and exit. */
  59 bool show_help = false;
  60
  61 /* If nonzero, print the version on standard output and exit.  */
  62 bool show_version = false;
  63
  64 /* If nonzero, it will attempt to kill a running tincd and exit. */
  65 int kill_tincd = 0;
  66
  67 /* If nonzero, generate public/private keypair for this host/net. */
  68 int generate_keys = 0;
  69
  70 /* If nonzero, use null ciphers and skip all key exchanges. */
  71 bool bypass_security = false;
  72
  73 /* If nonzero, disable swapping for this process. */
  74 bool do_mlock = false;
  75
  76 /* If nonzero, write log entries to a separate file. */
  77 bool use_logfile = false;
  78
  79 char *identname = NULL;                         /* program name for syslog */
  80 char *pidfilename = NULL;                       /* pid file location */
  81 char *logfilename = NULL;                       /* log file location */
  82 char **g_argv;                                  /* a copy of the cmdline arguments */
  83
  84 static int status;
  85
  86 static struct option const long_options[] = {
  87         {"config", required_argument, NULL, 'c'},
  88         {"kill", optional_argument, NULL, 'k'},
  89         {"net", required_argument, NULL, 'n'},
  90         {"help", no_argument, NULL, 1},
  91         {"version", no_argument, NULL, 2},
  92         {"no-detach", no_argument, NULL, 'D'},
  93         {"generate-keys", optional_argument, NULL, 'K'},
  94         {"debug", optional_argument, NULL, 'd'},
  95         {"bypass-security", no_argument, NULL, 3},
  96         {"mlock", no_argument, NULL, 'L'},
  97         {"logfile", optional_argument, NULL, 4},
  98         {"pidfile", required_argument, NULL, 5},
  99         {NULL, 0, NULL, 0}
 100 };
 101
 102 #ifdef HAVE_MINGW
 103 static struct WSAData wsa_state;
 104 #endif
 105
 106 static void usage(bool status)
 107 {
 108         if(status)
 109                 fprintf(stderr, _("Try `%s --help\' for more information.\n"),
 110                                 program_name);
 111         else {
 112                 printf(_("Usage: %s [option]...\n\n"), program_name);
 113                 printf(_("  -c, --config=DIR           Read configuration options from DIR.\n"
 114                                 "  -D, --no-detach            Don't fork and detach.\n"
 115                                 "  -d, --debug[=LEVEL]        Increase debug level or set it to LEVEL.\n"
 116                                 "  -k, --kill[=SIGNAL]        Attempt to kill a running tincd and exit.\n"
 117                                 "  -n, --net=NETNAME          Connect to net NETNAME.\n"
 118                                 "  -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
 119                                 "  -L, --mlock                Lock tinc into main memory.\n"
 120                                 "      --logfile[=FILENAME]   Write log entries to a logfile.\n"
 121                                 "      --pidfile=FILENAME     Write PID to FILENAME.\n"
 122                                 "      --help                 Display this help and exit.\n"
 123                                 "      --version              Output version information and exit.\n\n"));
 124                 printf(_("Report bugs to tinc@tinc-vpn.org.\n"));
 125         }
 126 }
 127
 128 static bool parse_options(int argc, char **argv)
 129 {
 130         int r;
 131         int option_index = 0;
 132
 133         while((r = getopt_long(argc, argv, "c:DLd::k::n:K::", long_options, &option_index)) != EOF) {
 134                 switch (r) {
 135                         case 0:                         /* long option */
 136                                 break;
 137
 138                         case 'c':                               /* config file */
 139                                 confbase = xstrdup(optarg);
 140                                 break;
 141
 142                         case 'D':                               /* no detach */
 143                                 do_detach = false;
 144                                 break;
 145
 146                         case 'L':                               /* no detach */
 147                                 do_mlock = true;
 148                                 break;
 149
 150                         case 'd':                               /* inc debug level */
 151                                 if(optarg)
 152                                         debug_level = atoi(optarg);
 153                                 else
 154                                         debug_level++;
 155                                 break;
 156
 157                         case 'k':                               /* kill old tincds */
 158 #ifndef HAVE_MINGW
 159                                 if(optarg) {
 160                                         if(!strcasecmp(optarg, "HUP"))
 161                                                 kill_tincd = SIGHUP;
 162                                         else if(!strcasecmp(optarg, "TERM"))
 163                                                 kill_tincd = SIGTERM;
 164                                         else if(!strcasecmp(optarg, "KILL"))
 165                                                 kill_tincd = SIGKILL;
 166                                         else if(!strcasecmp(optarg, "USR1"))
 167                                                 kill_tincd = SIGUSR1;
 168                                         else if(!strcasecmp(optarg, "USR2"))
 169                                                 kill_tincd = SIGUSR2;
 170                                         else if(!strcasecmp(optarg, "WINCH"))
 171                                                 kill_tincd = SIGWINCH;
 172                                         else if(!strcasecmp(optarg, "INT"))
 173                                                 kill_tincd = SIGINT;
 174                                         else if(!strcasecmp(optarg, "ALRM"))
 175                                                 kill_tincd = SIGALRM;
 176                                         else {
 177                                                 kill_tincd = atoi(optarg);
 178
 179                                                 if(!kill_tincd) {
 180                                                         fprintf(stderr, _("Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n"),
 181                                                                         optarg);
 182                                                         usage(true);
 183                                                         return false;
 184                                                 }
 185                                         }
 186                                 } else
 187                                         kill_tincd = SIGTERM;
 188 #else
 189                                         kill_tincd = 1;
 190 #endif
 191                                 break;
 192
 193                         case 'n':                               /* net name given */
 194                                 netname = xstrdup(optarg);
 195                                 break;
 196
 197                         case 'K':                               /* generate public/private keypair */
 198                                 if(optarg) {
 199                                         generate_keys = atoi(optarg);
 200
 201                                         if(generate_keys < 512) {
 202                                                 fprintf(stderr, _("Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n"),
 203                                                                 optarg);
 204                                                 usage(true);
 205                                                 return false;
 206                                         }
 207
 208                                         generate_keys &= ~7;    /* Round it to bytes */
 209                                 } else
 210                                         generate_keys = 1024;
 211                                 break;
 212
 213                         case 1:                                 /* show help */
 214                                 show_help = true;
 215                                 break;
 216
 217                         case 2:                                 /* show version */
 218                                 show_version = true;
 219                                 break;
 220
 221                         case 3:                                 /* bypass security */
 222                                 bypass_security = true;
 223                                 break;
 224
 225                         case 4:                                 /* write log entries to a file */
 226                                 use_logfile = true;
 227                                 if(optarg)
 228                                         logfilename = xstrdup(optarg);
 229                                 break;
 230
 231                         case 5:                                 /* write PID to a file */
 232                                 pidfilename = xstrdup(optarg);
 233                                 break;
 234
 235                         case '?':
 236                                 usage(true);
 237                                 return false;
 238
 239                         default:
 240                                 break;
 241                 }
 242         }
 243
 244         return true;
 245 }
 246
 247 /* This function prettyprints the key generation process */
 248
 249 static void indicator(int a, int b, void *p)
 250 {
 251         switch (a) {
 252                 case 0:
 253                         fprintf(stderr, ".");
 254                         break;
 255
 256                 case 1:
 257                         fprintf(stderr, "+");
 258                         break;
 259
 260                 case 2:
 261                         fprintf(stderr, "-");
 262                         break;
 263
 264                 case 3:
 265                         switch (b) {
 266                                 case 0:
 267                                         fprintf(stderr, " p\n");
 268                                         break;
 269
 270                                 case 1:
 271                                         fprintf(stderr, " q\n");
 272                                         break;
 273
 274                                 default:
 275                                         fprintf(stderr, "?");
 276                         }
 277                         break;
 278
 279                 default:
 280                         fprintf(stderr, "?");
 281         }
 282 }
 283
 284 /*
 285   Generate a public/private RSA keypair, and ask for a file to store
 286   them in.
 287 */
 288 static bool keygen(int bits)
 289 {
 290         RSA *rsa_key;
 291         FILE *f;
 292         char *name = NULL;
 293         char *filename;
 294
 295         get_config_string(lookup_config(config_tree, "Name"), &name);
 296
 297         if(name && !check_id(name)) {
 298                 fprintf(stderr, _("Invalid name for myself!\n"));
 299                 return false;
 300         }
 301
 302         fprintf(stderr, _("Generating %d bits keys:\n"), bits);
 303         rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
 304
 305         if(!rsa_key) {
 306                 fprintf(stderr, _("Error during key generation!\n"));
 307                 return false;
 308         } else
 309                 fprintf(stderr, _("Done.\n"));
 310
 311         asprintf(&filename, "%s/rsa_key.priv", confbase);
 312         f = ask_and_open(filename, _("private RSA key"));
 313
 314         if(!f)
 315                 return false;
 316
 317         if(disable_old_keys(f))
 318                 fprintf(stderr, _("Warning: old key(s) found and disabled.\n"));
 319
 320 #ifdef HAVE_FCHMOD
 321         /* Make it unreadable for others. */
 322         fchmod(fileno(f), 0600);
 323 #endif
 324
 325         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 326         fclose(f);
 327         free(filename);
 328
 329         if(name)
 330                 asprintf(&filename, "%s/hosts/%s", confbase, name);
 331         else
 332                 asprintf(&filename, "%s/rsa_key.pub", confbase);
 333
 334         f = ask_and_open(filename, _("public RSA key"));
 335
 336         if(!f)
 337                 return false;
 338
 339         if(disable_old_keys(f))
 340                 fprintf(stderr, _("Warning: old key(s) found and disabled.\n"));
 341
 342         PEM_write_RSAPublicKey(f, rsa_key);
 343         fclose(f);
 344         free(filename);
 345         if(name)
 346                 free(name);
 347
 348         return true;
 349 }
 350
 351 /*
 352   Set all files and paths according to netname
 353 */
 354 static void make_names(void)
 355 {
 356 #ifdef HAVE_MINGW
 357         HKEY key;
 358         char installdir[1024] = "";
 359         long len = sizeof(installdir);
 360 #endif
 361
 362         if(netname)
 363                 asprintf(&identname, "tinc.%s", netname);
 364         else
 365                 identname = xstrdup("tinc");
 366
 367 #ifdef HAVE_MINGW
 368         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 369                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 370                         if(!logfilename)
 371                                 asprintf(&logfilename, "%s/log/%s.log", identname);
 372                         if(!confbase) {
 373                                 if(netname)
 374                                         asprintf(&confbase, "%s/%s", installdir, netname);
 375                                 else
 376                                         asprintf(&confbase, "%s", installdir);
 377                         }
 378                 }
 379                 RegCloseKey(key);
 380                 if(*installdir)
 381                         return;
 382         }
 383 #endif
 384
 385         if(!pidfilename)
 386                 asprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
 387
 388         if(!logfilename)
 389                 asprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 390
 391         if(netname) {
 392                 if(!confbase)
 393                         asprintf(&confbase, CONFDIR "/tinc/%s", netname);
 394                 else
 395                         logger(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
 396         } else {
 397                 if(!confbase)
 398                         asprintf(&confbase, CONFDIR "/tinc");
 399         }
 400 }
 401
 402 static void free_names() {
 403         if (identname) free(identname);
 404         if (netname) free(netname);
 405         if (pidfilename) free(pidfilename);
 406         if (logfilename) free(logfilename);
 407         if (confbase) free(confbase);
 408 }
 409
 410 int main(int argc, char **argv)
 411 {
 412         program_name = argv[0];
 413
 414         setlocale(LC_ALL, "");
 415         bindtextdomain(PACKAGE, LOCALEDIR);
 416         textdomain(PACKAGE);
 417
 418         if(!parse_options(argc, argv))
 419                 return 1;
 420
 421         make_names();
 422
 423         if(show_version) {
 424                 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
 425                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 426                 printf(_("Copyright (C) 1998-2009 Ivo Timmermans, Guus Sliepen and others.\n"
 427                                 "See the AUTHORS file for a complete list.\n\n"
 428                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 429                                 "and you are welcome to redistribute it under certain conditions;\n"
 430                                 "see the file COPYING for details.\n"));
 431
 432                 return 0;
 433         }
 434
 435         if(show_help) {
 436                 usage(false);
 437                 return 0;
 438         }
 439
 440         if(kill_tincd)
 441                 return !kill_other(kill_tincd);
 442
 443         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 444
 445         /* Lock all pages into memory if requested */
 446
 447         if(do_mlock)
 448 #ifdef HAVE_MLOCKALL
 449                 if(mlockall(MCL_CURRENT | MCL_FUTURE)) {
 450                         logger(LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
 451                                    strerror(errno));
 452 #else
 453         {
 454                 logger(LOG_ERR, _("mlockall() not supported on this platform!"));
 455 #endif
 456                 return -1;
 457         }
 458
 459         g_argv = argv;
 460
 461         init_configuration(&config_tree);
 462
 463         /* Slllluuuuuuurrrrp! */
 464
 465         RAND_load_file("/dev/urandom", 1024);
 466
 467         ENGINE_load_builtin_engines();
 468         ENGINE_register_all_complete();
 469
 470         OpenSSL_add_all_algorithms();
 471
 472         if(generate_keys) {
 473                 read_server_config();
 474                 return !keygen(generate_keys);
 475         }
 476
 477         if(!read_server_config())
 478                 return 1;
 479
 480         if(lzo_init() != LZO_E_OK) {
 481                 logger(LOG_ERR, _("Error initializing LZO compressor!"));
 482                 return 1;
 483         }
 484
 485 #ifdef HAVE_MINGW
 486         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 487                 logger(LOG_ERR, _("System call `%s' failed: %s"), "WSAStartup", winerror(GetLastError()));
 488                 return 1;
 489         }
 490
 491         if(!do_detach || !init_service())
 492                 return main2(argc, argv);
 493         else
 494                 return 1;
 495 }
 496
 497 int main2(int argc, char **argv)
 498 {
 499 #endif
 500
 501         if(!detach())
 502                 return 1;
 503
 504
 505         /* Setup sockets and open device. */
 506
 507         if(!setup_network_connections())
 508                 goto end;
 509
 510         /* Start main loop. It only exits when tinc is killed. */
 511
 512         status = main_loop();
 513
 514         /* Shutdown properly. */
 515
 516         ifdebug(CONNECTIONS)
 517                 dump_device_stats();
 518
 519         close_network_connections();
 520
 521 end:
 522         logger(LOG_NOTICE, _("Terminating"));
 523
 524 #ifndef HAVE_MINGW
 525         remove_pid(pidfilename);
 526 #endif
 527
 528         EVP_cleanup();
 529         ENGINE_cleanup();
 530         CRYPTO_cleanup_all_ex_data();
 531         ERR_remove_state(0);
 532         ERR_free_strings();
 533
 534         exit_configuration(&config_tree);
 535         free_names();
 536
 537         return status;
 538 }