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                   2000-2007 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 *controlfilename = NULL;                   /* pid file location */
  82 char *logfilename = NULL;                       /* log file location */
  83 char **g_argv;                                  /* a copy of the cmdline arguments */
  84
  85 static int status;
  86
  87 static struct option const long_options[] = {
  88         {"config", required_argument, NULL, 'c'},
  89         {"kill", optional_argument, NULL, 'k'},
  90         {"net", required_argument, NULL, 'n'},
  91         {"help", no_argument, NULL, 1},
  92         {"version", no_argument, NULL, 2},
  93         {"no-detach", no_argument, NULL, 'D'},
  94         {"generate-keys", optional_argument, NULL, 'K'},
  95         {"debug", optional_argument, NULL, 'd'},
  96         {"bypass-security", no_argument, NULL, 3},
  97         {"mlock", no_argument, NULL, 'L'},
  98         {"logfile", optional_argument, NULL, 4},
  99         {"pidfile", required_argument, NULL, 5},
 100         {NULL, 0, NULL, 0}
 101 };
 102
 103 #ifdef HAVE_MINGW
 104 static struct WSAData wsa_state;
 105 #endif
 106
 107 static void usage(bool status)
 108 {
 109         if(status)
 110                 fprintf(stderr, _("Try `%s --help\' for more information.\n"),
 111                                 program_name);
 112         else {
 113                 printf(_("Usage: %s [option]...\n\n"), program_name);
 114                 printf(_("  -c, --config=DIR           Read configuration options from DIR.\n"
 115                                 "  -D, --no-detach            Don't fork and detach.\n"
 116                                 "  -d, --debug[=LEVEL]        Increase debug level or set it to LEVEL.\n"
 117                                 "  -k, --kill[=SIGNAL]        Attempt to kill a running tincd and exit.\n"
 118                                 "  -n, --net=NETNAME          Connect to net NETNAME.\n"
 119                                 "  -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
 120                                 "  -L, --mlock                Lock tinc into main memory.\n"
 121                                 "      --logfile[=FILENAME]   Write log entries to a logfile.\n"
 122                                 "      --pidfile=FILENAME     Write PID to FILENAME.\n"
 123                                 "      --help                 Display this help and exit.\n"
 124                                 "      --version              Output version information and exit.\n\n"));
 125                 printf(_("Report bugs to tinc@tinc-vpn.org.\n"));
 126         }
 127 }
 128
 129 static bool parse_options(int argc, char **argv)
 130 {
 131         int r;
 132         int option_index = 0;
 133
 134         while((r = getopt_long(argc, argv, "c:DLd::k::n:K::", long_options, &option_index)) != EOF) {
 135                 switch (r) {
 136                         case 0:                         /* long option */
 137                                 break;
 138
 139                         case 'c':                               /* config file */
 140                                 confbase = xstrdup(optarg);
 141                                 break;
 142
 143                         case 'D':                               /* no detach */
 144                                 do_detach = false;
 145                                 break;
 146
 147                         case 'L':                               /* no detach */
 148                                 do_mlock = true;
 149                                 break;
 150
 151                         case 'd':                               /* inc debug level */
 152                                 if(optarg)
 153                                         debug_level = atoi(optarg);
 154                                 else
 155                                         debug_level++;
 156                                 break;
 157
 158                         case 'k':                               /* kill old tincds */
 159 #ifndef HAVE_MINGW
 160                                 if(optarg) {
 161                                         if(!strcasecmp(optarg, "HUP"))
 162                                                 kill_tincd = SIGHUP;
 163                                         else if(!strcasecmp(optarg, "TERM"))
 164                                                 kill_tincd = SIGTERM;
 165                                         else if(!strcasecmp(optarg, "KILL"))
 166                                                 kill_tincd = SIGKILL;
 167                                         else if(!strcasecmp(optarg, "USR1"))
 168                                                 kill_tincd = SIGUSR1;
 169                                         else if(!strcasecmp(optarg, "USR2"))
 170                                                 kill_tincd = SIGUSR2;
 171                                         else if(!strcasecmp(optarg, "WINCH"))
 172                                                 kill_tincd = SIGWINCH;
 173                                         else if(!strcasecmp(optarg, "INT"))
 174                                                 kill_tincd = SIGINT;
 175                                         else if(!strcasecmp(optarg, "ALRM"))
 176                                                 kill_tincd = SIGALRM;
 177                                         else {
 178                                                 kill_tincd = atoi(optarg);
 179
 180                                                 if(!kill_tincd) {
 181                                                         fprintf(stderr, _("Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n"),
 182                                                                         optarg);
 183                                                         usage(true);
 184                                                         return false;
 185                                                 }
 186                                         }
 187                                 } else
 188                                         kill_tincd = SIGTERM;
 189 #else
 190                                         kill_tincd = 1;
 191 #endif
 192                                 break;
 193
 194                         case 'n':                               /* net name given */
 195                                 netname = xstrdup(optarg);
 196                                 break;
 197
 198                         case 'K':                               /* generate public/private keypair */
 199                                 if(optarg) {
 200                                         generate_keys = atoi(optarg);
 201
 202                                         if(generate_keys < 512) {
 203                                                 fprintf(stderr, _("Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n"),
 204                                                                 optarg);
 205                                                 usage(true);
 206                                                 return false;
 207                                         }
 208
 209                                         generate_keys &= ~7;    /* Round it to bytes */
 210                                 } else
 211                                         generate_keys = 1024;
 212                                 break;
 213
 214                         case 1:                                 /* show help */
 215                                 show_help = true;
 216                                 break;
 217
 218                         case 2:                                 /* show version */
 219                                 show_version = true;
 220                                 break;
 221
 222                         case 3:                                 /* bypass security */
 223                                 bypass_security = true;
 224                                 break;
 225
 226                         case 4:                                 /* write log entries to a file */
 227                                 use_logfile = true;
 228                                 if(optarg)
 229                                         logfilename = xstrdup(optarg);
 230                                 break;
 231
 232                         case 5:                                 /* write PID to a file */
 233                                 pidfilename = xstrdup(optarg);
 234                                 break;
 235
 236                         case '?':
 237                                 usage(true);
 238                                 return false;
 239
 240                         default:
 241                                 break;
 242                 }
 243         }
 244
 245         return true;
 246 }
 247
 248 /* This function prettyprints the key generation process */
 249
 250 static void indicator(int a, int b, void *p)
 251 {
 252         switch (a) {
 253                 case 0:
 254                         fprintf(stderr, ".");
 255                         break;
 256
 257                 case 1:
 258                         fprintf(stderr, "+");
 259                         break;
 260
 261                 case 2:
 262                         fprintf(stderr, "-");
 263                         break;
 264
 265                 case 3:
 266                         switch (b) {
 267                                 case 0:
 268                                         fprintf(stderr, " p\n");
 269                                         break;
 270
 271                                 case 1:
 272                                         fprintf(stderr, " q\n");
 273                                         break;
 274
 275                                 default:
 276                                         fprintf(stderr, "?");
 277                         }
 278                         break;
 279
 280                 default:
 281                         fprintf(stderr, "?");
 282         }
 283 }
 284
 285 /*
 286   Generate a public/private RSA keypair, and ask for a file to store
 287   them in.
 288 */
 289 static bool keygen(int bits)
 290 {
 291         RSA *rsa_key;
 292         FILE *f;
 293         char *name = NULL;
 294         char *filename;
 295
 296         fprintf(stderr, _("Generating %d bits keys:\n"), bits);
 297         rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
 298
 299         if(!rsa_key) {
 300                 fprintf(stderr, _("Error during key generation!\n"));
 301                 return false;
 302         } else
 303                 fprintf(stderr, _("Done.\n"));
 304
 305         asprintf(&filename, "%s/rsa_key.priv", confbase);
 306         f = ask_and_open(filename, _("private RSA key"), "a");
 307
 308         if(!f)
 309                 return false;
 310
 311 #ifdef HAVE_FCHMOD
 312         /* Make it unreadable for others. */
 313         fchmod(fileno(f), 0600);
 314 #endif
 315
 316         if(ftell(f))
 317                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 318
 319         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 320         fclose(f);
 321         free(filename);
 322
 323         get_config_string(lookup_config(config_tree, "Name"), &name);
 324
 325         if(name)
 326                 asprintf(&filename, "%s/hosts/%s", confbase, name);
 327         else
 328                 asprintf(&filename, "%s/rsa_key.pub", confbase);
 329
 330         f = ask_and_open(filename, _("public RSA key"), "a");
 331
 332         if(!f)
 333                 return false;
 334
 335         if(ftell(f))
 336                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 337
 338         PEM_write_RSAPublicKey(f, rsa_key);
 339         fclose(f);
 340         free(filename);
 341
 342         return true;
 343 }
 344
 345 /*
 346   Set all files and paths according to netname
 347 */
 348 static void make_names(void)
 349 {
 350 #ifdef HAVE_MINGW
 351         HKEY key;
 352         char installdir[1024] = "";
 353         long len = sizeof(installdir);
 354 #endif
 355
 356         if(netname)
 357                 asprintf(&identname, "tinc.%s", netname);
 358         else
 359                 identname = xstrdup("tinc");
 360
 361 #ifdef HAVE_MINGW
 362         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 363                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 364                         if(!logfilename)
 365                                 asprintf(&logfilename, "%s/log/%s.log", identname);
 366                         if(!confbase) {
 367                                 if(netname)
 368                                         asprintf(&confbase, "%s/%s", installdir, netname);
 369                                 else
 370                                         asprintf(&confbase, "%s", installdir);
 371                         }
 372                 }
 373                 RegCloseKey(key);
 374                 if(*installdir)
 375                         return;
 376         }
 377 #endif
 378
 379         if(!pidfilename)
 380                 asprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
 381
 382         asprintf(&controlfilename, LOCALSTATEDIR "/run/%s.control", identname);
 383
 384         if(!logfilename)
 385                 asprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 386
 387         if(netname) {
 388                 if(!confbase)
 389                         asprintf(&confbase, CONFDIR "/tinc/%s", netname);
 390                 else
 391                         logger(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
 392         } else {
 393                 if(!confbase)
 394                         asprintf(&confbase, CONFDIR "/tinc");
 395         }
 396 }
 397
 398 int main(int argc, char **argv)
 399 {
 400         program_name = argv[0];
 401
 402         setlocale(LC_ALL, "");
 403         bindtextdomain(PACKAGE, LOCALEDIR);
 404         textdomain(PACKAGE);
 405
 406         if(!parse_options(argc, argv))
 407                 return 1;
 408
 409         make_names();
 410
 411         if(show_version) {
 412                 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
 413                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 414                 printf(_("Copyright (C) 1998-2007 Ivo Timmermans, Guus Sliepen and others.\n"
 415                                 "See the AUTHORS file for a complete list.\n\n"
 416                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 417                                 "and you are welcome to redistribute it under certain conditions;\n"
 418                                 "see the file COPYING for details.\n"));
 419
 420                 return 0;
 421         }
 422
 423         if(show_help) {
 424                 usage(false);
 425                 return 0;
 426         }
 427
 428         if(kill_tincd)
 429                 return !kill_other(kill_tincd);
 430
 431         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 432
 433         /* Lock all pages into memory if requested */
 434
 435         if(do_mlock)
 436 #ifdef HAVE_MLOCKALL
 437                 if(mlockall(MCL_CURRENT | MCL_FUTURE)) {
 438                         logger(LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
 439                                    strerror(errno));
 440 #else
 441         {
 442                 logger(LOG_ERR, _("mlockall() not supported on this platform!"));
 443 #endif
 444                 return -1;
 445         }
 446
 447         g_argv = argv;
 448
 449         init_configuration(&config_tree);
 450
 451         /* Slllluuuuuuurrrrp! */
 452
 453         srand(time(NULL));
 454         RAND_load_file("/dev/urandom", 1024);
 455
 456         ENGINE_load_builtin_engines();
 457         ENGINE_register_all_complete();
 458
 459         OpenSSL_add_all_algorithms();
 460
 461         if(generate_keys) {
 462                 read_server_config();
 463                 return !keygen(generate_keys);
 464         }
 465
 466         if(!read_server_config())
 467                 return 1;
 468
 469         if(event_init() < 0) {
 470                 logger(LOG_ERR, _("Error initializing libevent!"));
 471                 return 1;
 472         }
 473
 474         if(lzo_init() != LZO_E_OK) {
 475                 logger(LOG_ERR, _("Error initializing LZO compressor!"));
 476                 return 1;
 477         }
 478
 479 #ifdef HAVE_MINGW
 480         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 481                 logger(LOG_ERR, _("System call `%s' failed: %s"), "WSAStartup", winerror(GetLastError()));
 482                 return 1;
 483         }
 484
 485         if(!do_detach || !init_service())
 486                 return main2(argc, argv);
 487         else
 488                 return 1;
 489 }
 490
 491 int main2(int argc, char **argv)
 492 {
 493 #endif
 494
 495         if(!detach())
 496                 return 1;
 497
 498
 499         /* Setup sockets and open device. */
 500
 501         if(!setup_network_connections())
 502                 goto end;
 503
 504         /* Start main loop. It only exits when tinc is killed. */
 505
 506         status = main_loop();
 507
 508         /* Shutdown properly. */
 509
 510         close_network_connections();
 511
 512         ifdebug(CONNECTIONS)
 513                 dump_device_stats();
 514
 515 end:
 516         logger(LOG_NOTICE, _("Terminating"));
 517
 518 #ifndef HAVE_MINGW
 519         remove_pid(pidfilename);
 520 #endif
 521
 522         EVP_cleanup();
 523
 524         return status;
 525 }