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

   1 /*
   2     tincd.c -- the main file for tincd
   3     Copyright (C) 1998-2005 Ivo Timmermans
   4                   2000-2006 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 #ifdef HAVE_LZO_LZO1X_H
  41 #include <lzo/lzo1x.h>
  42 #endif
  43 #ifdef HAVE_LZO1X_H
  44 #include <lzo1x.h>
  45 #endif
  46
  47 #include <getopt.h>
  48 #include "pidfile.h"
  49
  50 #include "conf.h"
  51 #include "device.h"
  52 #include "logger.h"
  53 #include "net.h"
  54 #include "netutl.h"
  55 #include "process.h"
  56 #include "protocol.h"
  57 #include "utils.h"
  58 #include "xalloc.h"
  59
  60 /* The name this program was run with. */
  61 char *program_name = NULL;
  62
  63 /* If nonzero, display usage information and exit. */
  64 bool show_help = false;
  65
  66 /* If nonzero, print the version on standard output and exit.  */
  67 bool show_version = false;
  68
  69 /* If nonzero, it will attempt to kill a running tincd and exit. */
  70 int kill_tincd = 0;
  71
  72 /* If nonzero, generate public/private keypair for this host/net. */
  73 int generate_keys = 0;
  74
  75 /* If nonzero, use null ciphers and skip all key exchanges. */
  76 bool bypass_security = false;
  77
  78 /* If nonzero, disable swapping for this process. */
  79 bool do_mlock = false;
  80
  81 /* If nonzero, write log entries to a separate file. */
  82 bool use_logfile = false;
  83
  84 char *identname = NULL;                         /* program name for syslog */
  85 char *pidfilename = NULL;                       /* pid file location */
  86 char *logfilename = NULL;                       /* log file location */
  87 char **g_argv;                                  /* a copy of the cmdline arguments */
  88
  89 static int status;
  90
  91 static struct option const long_options[] = {
  92         {"config", required_argument, NULL, 'c'},
  93         {"kill", optional_argument, NULL, 'k'},
  94         {"net", required_argument, NULL, 'n'},
  95         {"help", no_argument, NULL, 1},
  96         {"version", no_argument, NULL, 2},
  97         {"no-detach", no_argument, NULL, 'D'},
  98         {"generate-keys", optional_argument, NULL, 'K'},
  99         {"debug", optional_argument, NULL, 'd'},
 100         {"bypass-security", no_argument, NULL, 3},
 101         {"mlock", no_argument, NULL, 'L'},
 102         {"logfile", optional_argument, NULL, 4},
 103         {"pidfile", required_argument, NULL, 5},
 104         {NULL, 0, NULL, 0}
 105 };
 106
 107 #ifdef HAVE_MINGW
 108 static struct WSAData wsa_state;
 109 #endif
 110
 111 static void usage(bool status)
 112 {
 113         if(status)
 114                 fprintf(stderr, _("Try `%s --help\' for more information.\n"),
 115                                 program_name);
 116         else {
 117                 printf(_("Usage: %s [option]...\n\n"), program_name);
 118                 printf(_("  -c, --config=DIR           Read configuration options from DIR.\n"
 119                                 "  -D, --no-detach            Don't fork and detach.\n"
 120                                 "  -d, --debug[=LEVEL]        Increase debug level or set it to LEVEL.\n"
 121                                 "  -k, --kill[=SIGNAL]        Attempt to kill a running tincd and exit.\n"
 122                                 "  -n, --net=NETNAME          Connect to net NETNAME.\n"
 123                                 "  -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
 124                                 "  -L, --mlock                Lock tinc into main memory.\n"
 125                                 "      --logfile[=FILENAME]   Write log entries to a logfile.\n"
 126                                 "      --pidfile=FILENAME     Write PID to FILENAME.\n"
 127                                 "      --help                 Display this help and exit.\n"
 128                                 "      --version              Output version information and exit.\n\n"));
 129                 printf(_("Report bugs to tinc@tinc-vpn.org.\n"));
 130         }
 131 }
 132
 133 static bool parse_options(int argc, char **argv)
 134 {
 135         int r;
 136         int option_index = 0;
 137
 138         while((r = getopt_long(argc, argv, "c:DLd::k::n:K::", long_options, &option_index)) != EOF) {
 139                 switch (r) {
 140                         case 0:                         /* long option */
 141                                 break;
 142
 143                         case 'c':                               /* config file */
 144                                 confbase = xstrdup(optarg);
 145                                 break;
 146
 147                         case 'D':                               /* no detach */
 148                                 do_detach = false;
 149                                 break;
 150
 151                         case 'L':                               /* no detach */
 152                                 do_mlock = true;
 153                                 break;
 154
 155                         case 'd':                               /* inc debug level */
 156                                 if(optarg)
 157                                         debug_level = atoi(optarg);
 158                                 else
 159                                         debug_level++;
 160                                 break;
 161
 162                         case 'k':                               /* kill old tincds */
 163 #ifndef HAVE_MINGW
 164                                 if(optarg) {
 165                                         if(!strcasecmp(optarg, "HUP"))
 166                                                 kill_tincd = SIGHUP;
 167                                         else if(!strcasecmp(optarg, "TERM"))
 168                                                 kill_tincd = SIGTERM;
 169                                         else if(!strcasecmp(optarg, "KILL"))
 170                                                 kill_tincd = SIGKILL;
 171                                         else if(!strcasecmp(optarg, "USR1"))
 172                                                 kill_tincd = SIGUSR1;
 173                                         else if(!strcasecmp(optarg, "USR2"))
 174                                                 kill_tincd = SIGUSR2;
 175                                         else if(!strcasecmp(optarg, "WINCH"))
 176                                                 kill_tincd = SIGWINCH;
 177                                         else if(!strcasecmp(optarg, "INT"))
 178                                                 kill_tincd = SIGINT;
 179                                         else if(!strcasecmp(optarg, "ALRM"))
 180                                                 kill_tincd = SIGALRM;
 181                                         else {
 182                                                 kill_tincd = atoi(optarg);
 183
 184                                                 if(!kill_tincd) {
 185                                                         fprintf(stderr, _("Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n"),
 186                                                                         optarg);
 187                                                         usage(true);
 188                                                         return false;
 189                                                 }
 190                                         }
 191                                 } else
 192                                         kill_tincd = SIGTERM;
 193 #else
 194                                         kill_tincd = 1;
 195 #endif
 196                                 break;
 197
 198                         case 'n':                               /* net name given */
 199                                 netname = xstrdup(optarg);
 200                                 break;
 201
 202                         case 'K':                               /* generate public/private keypair */
 203                                 if(optarg) {
 204                                         generate_keys = atoi(optarg);
 205
 206                                         if(generate_keys < 512) {
 207                                                 fprintf(stderr, _("Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n"),
 208                                                                 optarg);
 209                                                 usage(true);
 210                                                 return false;
 211                                         }
 212
 213                                         generate_keys &= ~7;    /* Round it to bytes */
 214                                 } else
 215                                         generate_keys = 1024;
 216                                 break;
 217
 218                         case 1:                                 /* show help */
 219                                 show_help = true;
 220                                 break;
 221
 222                         case 2:                                 /* show version */
 223                                 show_version = true;
 224                                 break;
 225
 226                         case 3:                                 /* bypass security */
 227                                 bypass_security = true;
 228                                 break;
 229
 230                         case 4:                                 /* write log entries to a file */
 231                                 use_logfile = true;
 232                                 if(optarg)
 233                                         logfilename = xstrdup(optarg);
 234                                 break;
 235
 236                         case 5:                                 /* write PID to a file */
 237                                 pidfilename = xstrdup(optarg);
 238                                 break;
 239
 240                         case '?':
 241                                 usage(true);
 242                                 return false;
 243
 244                         default:
 245                                 break;
 246                 }
 247         }
 248
 249         return true;
 250 }
 251
 252 /* This function prettyprints the key generation process */
 253
 254 static void indicator(int a, int b, void *p)
 255 {
 256         switch (a) {
 257                 case 0:
 258                         fprintf(stderr, ".");
 259                         break;
 260
 261                 case 1:
 262                         fprintf(stderr, "+");
 263                         break;
 264
 265                 case 2:
 266                         fprintf(stderr, "-");
 267                         break;
 268
 269                 case 3:
 270                         switch (b) {
 271                                 case 0:
 272                                         fprintf(stderr, " p\n");
 273                                         break;
 274
 275                                 case 1:
 276                                         fprintf(stderr, " q\n");
 277                                         break;
 278
 279                                 default:
 280                                         fprintf(stderr, "?");
 281                         }
 282                         break;
 283
 284                 default:
 285                         fprintf(stderr, "?");
 286         }
 287 }
 288
 289 /*
 290   Generate a public/private RSA keypair, and ask for a file to store
 291   them in.
 292 */
 293 static bool keygen(int bits)
 294 {
 295         RSA *rsa_key;
 296         FILE *f;
 297         char *name = NULL;
 298         char *filename;
 299
 300         fprintf(stderr, _("Generating %d bits keys:\n"), bits);
 301         rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
 302
 303         if(!rsa_key) {
 304                 fprintf(stderr, _("Error during key generation!\n"));
 305                 return false;
 306         } else
 307                 fprintf(stderr, _("Done.\n"));
 308
 309         asprintf(&filename, "%s/rsa_key.priv", confbase);
 310         f = ask_and_open(filename, _("private RSA key"), "a");
 311
 312         if(!f)
 313                 return false;
 314
 315 #ifdef HAVE_FCHMOD
 316         /* Make it unreadable for others. */
 317         fchmod(fileno(f), 0600);
 318 #endif
 319
 320         if(ftell(f))
 321                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 322
 323         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 324         fclose(f);
 325         free(filename);
 326
 327         get_config_string(lookup_config(config_tree, "Name"), &name);
 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"), "a");
 335
 336         if(!f)
 337                 return false;
 338
 339         if(ftell(f))
 340                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 341
 342         PEM_write_RSAPublicKey(f, rsa_key);
 343         fclose(f);
 344         free(filename);
 345
 346         return true;
 347 }
 348
 349 /*
 350   Set all files and paths according to netname
 351 */
 352 static void make_names(void)
 353 {
 354 #ifdef HAVE_MINGW
 355         HKEY key;
 356         char installdir[1024] = "";
 357         long len = sizeof(installdir);
 358 #endif
 359
 360         if(netname)
 361                 asprintf(&identname, "tinc.%s", netname);
 362         else
 363                 identname = xstrdup("tinc");
 364
 365 #ifdef HAVE_MINGW
 366         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 367                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 368                         if(!logfilename)
 369                                 asprintf(&logfilename, "%s/log/%s.log", identname);
 370                         if(!confbase) {
 371                                 if(netname)
 372                                         asprintf(&confbase, "%s/%s", installdir, netname);
 373                                 else
 374                                         asprintf(&confbase, "%s", installdir);
 375                         }
 376                 }
 377                 RegCloseKey(key);
 378                 if(*installdir)
 379                         return;
 380         }
 381 #endif
 382
 383         if(!pidfilename)
 384                 asprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
 385
 386         if(!logfilename)
 387                 asprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 388
 389         if(netname) {
 390                 if(!confbase)
 391                         asprintf(&confbase, CONFDIR "/tinc/%s", netname);
 392                 else
 393                         logger(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
 394         } else {
 395                 if(!confbase)
 396                         asprintf(&confbase, CONFDIR "/tinc");
 397         }
 398 }
 399
 400 int main(int argc, char **argv)
 401 {
 402         program_name = argv[0];
 403
 404         setlocale(LC_ALL, "");
 405         bindtextdomain(PACKAGE, LOCALEDIR);
 406         textdomain(PACKAGE);
 407
 408         if(!parse_options(argc, argv))
 409                 return 1;
 410
 411         make_names();
 412
 413         if(show_version) {
 414                 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
 415                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 416                 printf(_("Copyright (C) 1998-2006 Ivo Timmermans, Guus Sliepen and others.\n"
 417                                 "See the AUTHORS file for a complete list.\n\n"
 418                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 419                                 "and you are welcome to redistribute it under certain conditions;\n"
 420                                 "see the file COPYING for details.\n"));
 421
 422                 return 0;
 423         }
 424
 425         if(show_help) {
 426                 usage(false);
 427                 return 0;
 428         }
 429
 430         if(kill_tincd)
 431                 return !kill_other(kill_tincd);
 432
 433         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 434
 435         /* Lock all pages into memory if requested */
 436
 437         if(do_mlock)
 438 #ifdef HAVE_MLOCKALL
 439                 if(mlockall(MCL_CURRENT | MCL_FUTURE)) {
 440                         logger(LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
 441                                    strerror(errno));
 442 #else
 443         {
 444                 logger(LOG_ERR, _("mlockall() not supported on this platform!"));
 445 #endif
 446                 return -1;
 447         }
 448
 449         g_argv = argv;
 450
 451         init_configuration(&config_tree);
 452
 453         /* Slllluuuuuuurrrrp! */
 454
 455         RAND_load_file("/dev/urandom", 1024);
 456
 457         ENGINE_load_builtin_engines();
 458         ENGINE_register_all_complete();
 459
 460         OpenSSL_add_all_algorithms();
 461
 462         if(generate_keys) {
 463                 read_server_config();
 464                 return !keygen(generate_keys);
 465         }
 466
 467         if(!read_server_config())
 468                 return 1;
 469
 470         if(lzo_init() != LZO_E_OK) {
 471                 logger(LOG_ERR, _("Error initializing LZO compressor!"));
 472                 return 1;
 473         }
 474
 475 #ifdef HAVE_MINGW
 476         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 477                 logger(LOG_ERR, _("System call `%s' failed: %s"), "WSAStartup", winerror(GetLastError()));
 478                 return 1;
 479         }
 480
 481         if(!do_detach || !init_service())
 482                 return main2(argc, argv);
 483         else
 484                 return 1;
 485 }
 486
 487 int main2(int argc, char **argv)
 488 {
 489 #endif
 490
 491         if(!detach())
 492                 return 1;
 493
 494
 495         /* Setup sockets and open device. */
 496
 497         if(!setup_network_connections())
 498                 goto end;
 499
 500         /* Start main loop. It only exits when tinc is killed. */
 501
 502         status = main_loop();
 503
 504         /* Shutdown properly. */
 505
 506         close_network_connections();
 507
 508         ifdebug(CONNECTIONS)
 509                 dump_device_stats();
 510
 511 end:
 512         logger(LOG_NOTICE, _("Terminating"));
 513
 514 #ifndef HAVE_MINGW
 515         remove_pid(pidfilename);
 516 #endif
 517
 518         EVP_cleanup();
 519
 520         return status;
 521 }