src/tincd.c

   1 /*
   2     tincd.c -- the main file for tincd
   3     Copyright (C) 1998-2005 Ivo Timmermans <ivo@tinc-vpn.org>
   4                   2000-2005 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
  39 #include <lzo1x.h>
  40
  41 #include <getopt.h>
  42 #include "pidfile.h"
  43
  44 #include "conf.h"
  45 #include "device.h"
  46 #include "logger.h"
  47 #include "net.h"
  48 #include "netutl.h"
  49 #include "process.h"
  50 #include "protocol.h"
  51 #include "utils.h"
  52 #include "xalloc.h"
  53
  54 /* The name this program was run with. */
  55 char *program_name = NULL;
  56
  57 /* If nonzero, display usage information and exit. */
  58 bool show_help = false;
  59
  60 /* If nonzero, print the version on standard output and exit.  */
  61 bool show_version = false;
  62
  63 /* If nonzero, it will attempt to kill a running tincd and exit. */
  64 int kill_tincd = 0;
  65
  66 /* If nonzero, generate public/private keypair for this host/net. */
  67 int generate_keys = 0;
  68
  69 /* If nonzero, use null ciphers and skip all key exchanges. */
  70 bool bypass_security = false;
  71
  72 /* If nonzero, disable swapping for this process. */
  73 bool do_mlock = false;
  74
  75 /* If nonzero, write log entries to a separate file. */
  76 bool use_logfile = false;
  77
  78 char *identname = NULL;                         /* program name for syslog */
  79 char *pidfilename = NULL;                       /* pid file location */
  80 char *logfilename = NULL;                       /* log file location */
  81 char **g_argv;                                  /* a copy of the cmdline arguments */
  82
  83 static int status;
  84
  85 static struct option const long_options[] = {
  86         {"config", required_argument, NULL, 'c'},
  87         {"kill", optional_argument, NULL, 'k'},
  88         {"net", required_argument, NULL, 'n'},
  89         {"help", no_argument, NULL, 1},
  90         {"version", no_argument, NULL, 2},
  91         {"no-detach", no_argument, NULL, 'D'},
  92         {"generate-keys", optional_argument, NULL, 'K'},
  93         {"debug", optional_argument, NULL, 'd'},
  94         {"bypass-security", no_argument, NULL, 3},
  95         {"mlock", no_argument, NULL, 'L'},
  96         {"logfile", optional_argument, NULL, 4},
  97         {"pidfile", required_argument, NULL, 5},
  98         {NULL, 0, NULL, 0}
  99 };
 100
 101 #ifdef HAVE_MINGW
 102 static struct WSAData wsa_state;
 103 #endif
 104
 105 static void usage(bool status)
 106 {
 107         if(status)
 108                 fprintf(stderr, _("Try `%s --help\' for more information.\n"),
 109                                 program_name);
 110         else {
 111                 printf(_("Usage: %s [option]...\n\n"), program_name);
 112                 printf(_("  -c, --config=DIR           Read configuration options from DIR.\n"
 113                                 "  -D, --no-detach            Don't fork and detach.\n"
 114                                 "  -d, --debug[=LEVEL]        Increase debug level or set it to LEVEL.\n"
 115                                 "  -k, --kill[=SIGNAL]        Attempt to kill a running tincd and exit.\n"
 116                                 "  -n, --net=NETNAME          Connect to net NETNAME.\n"
 117                                 "  -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
 118                                 "  -L, --mlock                Lock tinc into main memory.\n"
 119                                 "      --logfile[=FILENAME]   Write log entries to a logfile.\n"
 120                                 "      --pidfile=FILENAME     Write PID to FILENAME.\n"
 121                                 "      --help                 Display this help and exit.\n"
 122                                 "      --version              Output version information and exit.\n\n"));
 123                 printf(_("Report bugs to tinc@tinc-vpn.org.\n"));
 124         }
 125 }
 126
 127 static bool parse_options(int argc, char **argv)
 128 {
 129         int r;
 130         int option_index = 0;
 131
 132         while((r = getopt_long(argc, argv, "c:DLd::k::n:K::", long_options, &option_index)) != EOF) {
 133                 switch (r) {
 134                         case 0:                         /* long option */
 135                                 break;
 136
 137                         case 'c':                               /* config file */
 138                                 confbase = xstrdup(optarg);
 139                                 break;
 140
 141                         case 'D':                               /* no detach */
 142                                 do_detach = false;
 143                                 break;
 144
 145                         case 'L':                               /* no detach */
 146                                 do_mlock = true;
 147                                 break;
 148
 149                         case 'd':                               /* inc debug level */
 150                                 if(optarg)
 151                                         debug_level = atoi(optarg);
 152                                 else
 153                                         debug_level++;
 154                                 break;
 155
 156                         case 'k':                               /* kill old tincds */
 157 #ifndef HAVE_MINGW
 158                                 if(optarg) {
 159                                         if(!strcasecmp(optarg, "HUP"))
 160                                                 kill_tincd = SIGHUP;
 161                                         else if(!strcasecmp(optarg, "TERM"))
 162                                                 kill_tincd = SIGTERM;
 163                                         else if(!strcasecmp(optarg, "KILL"))
 164                                                 kill_tincd = SIGKILL;
 165                                         else if(!strcasecmp(optarg, "USR1"))
 166                                                 kill_tincd = SIGUSR1;
 167                                         else if(!strcasecmp(optarg, "USR2"))
 168                                                 kill_tincd = SIGUSR2;
 169                                         else if(!strcasecmp(optarg, "WINCH"))
 170                                                 kill_tincd = SIGWINCH;
 171                                         else if(!strcasecmp(optarg, "INT"))
 172                                                 kill_tincd = SIGINT;
 173                                         else if(!strcasecmp(optarg, "ALRM"))
 174                                                 kill_tincd = SIGALRM;
 175                                         else {
 176                                                 kill_tincd = atoi(optarg);
 177
 178                                                 if(!kill_tincd) {
 179                                                         fprintf(stderr, _("Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n"),
 180                                                                         optarg);
 181                                                         usage(true);
 182                                                         return false;
 183                                                 }
 184                                         }
 185                                 } else
 186                                         kill_tincd = SIGTERM;
 187 #else
 188                                         kill_tincd = 1;
 189 #endif
 190                                 break;
 191
 192                         case 'n':                               /* net name given */
 193                                 netname = xstrdup(optarg);
 194                                 break;
 195
 196                         case 'K':                               /* generate public/private keypair */
 197                                 if(optarg) {
 198                                         generate_keys = atoi(optarg);
 199
 200                                         if(generate_keys < 512) {
 201                                                 fprintf(stderr, _("Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n"),
 202                                                                 optarg);
 203                                                 usage(true);
 204                                                 return false;
 205                                         }
 206
 207                                         generate_keys &= ~7;    /* Round it to bytes */
 208                                 } else
 209                                         generate_keys = 1024;
 210                                 break;
 211
 212                         case 1:                                 /* show help */
 213                                 show_help = true;
 214                                 break;
 215
 216                         case 2:                                 /* show version */
 217                                 show_version = true;
 218                                 break;
 219
 220                         case 3:                                 /* bypass security */
 221                                 bypass_security = true;
 222                                 break;
 223
 224                         case 4:                                 /* write log entries to a file */
 225                                 use_logfile = true;
 226                                 if(optarg)
 227                                         logfilename = xstrdup(optarg);
 228                                 break;
 229
 230                         case 5:                                 /* write PID to a file */
 231                                 pidfilename = xstrdup(optarg);
 232                                 break;
 233
 234                         case '?':
 235                                 usage(true);
 236                                 return false;
 237
 238                         default:
 239                                 break;
 240                 }
 241         }
 242
 243         return true;
 244 }
 245
 246 /* This function prettyprints the key generation process */
 247
 248 static void indicator(int a, int b, void *p)
 249 {
 250         switch (a) {
 251                 case 0:
 252                         fprintf(stderr, ".");
 253                         break;
 254
 255                 case 1:
 256                         fprintf(stderr, "+");
 257                         break;
 258
 259                 case 2:
 260                         fprintf(stderr, "-");
 261                         break;
 262
 263                 case 3:
 264                         switch (b) {
 265                                 case 0:
 266                                         fprintf(stderr, " p\n");
 267                                         break;
 268
 269                                 case 1:
 270                                         fprintf(stderr, " q\n");
 271                                         break;
 272
 273                                 default:
 274                                         fprintf(stderr, "?");
 275                         }
 276                         break;
 277
 278                 default:
 279                         fprintf(stderr, "?");
 280         }
 281 }
 282
 283 /*
 284   Generate a public/private RSA keypair, and ask for a file to store
 285   them in.
 286 */
 287 static bool keygen(int bits)
 288 {
 289         RSA *rsa_key;
 290         FILE *f;
 291         char *name = NULL;
 292         char *filename;
 293
 294         fprintf(stderr, _("Generating %d bits keys:\n"), bits);
 295         rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
 296
 297         if(!rsa_key) {
 298                 fprintf(stderr, _("Error during key generation!\n"));
 299                 return false;
 300         } else
 301                 fprintf(stderr, _("Done.\n"));
 302
 303         asprintf(&filename, "%s/rsa_key.priv", confbase);
 304         f = ask_and_open(filename, _("private RSA key"), "a");
 305
 306         if(!f)
 307                 return false;
 308
 309 #ifdef HAVE_FCHMOD
 310         /* Make it unreadable for others. */
 311         fchmod(fileno(f), 0600);
 312 #endif
 313
 314         if(ftell(f))
 315                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 316
 317         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 318         fclose(f);
 319         free(filename);
 320
 321         get_config_string(lookup_config(config_tree, "Name"), &name);
 322
 323         if(name)
 324                 asprintf(&filename, "%s/hosts/%s", confbase, name);
 325         else
 326                 asprintf(&filename, "%s/rsa_key.pub", confbase);
 327
 328         f = ask_and_open(filename, _("public RSA key"), "a");
 329
 330         if(!f)
 331                 return false;
 332
 333         if(ftell(f))
 334                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 335
 336         PEM_write_RSAPublicKey(f, rsa_key);
 337         fclose(f);
 338         free(filename);
 339
 340         return true;
 341 }
 342
 343 /*
 344   Set all files and paths according to netname
 345 */
 346 static void make_names(void)
 347 {
 348 #ifdef HAVE_MINGW
 349         HKEY key;
 350         char installdir[1024] = "";
 351         long len = sizeof(installdir);
 352 #endif
 353
 354         if(netname)
 355                 asprintf(&identname, "tinc.%s", netname);
 356         else
 357                 identname = xstrdup("tinc");
 358
 359 #ifdef HAVE_MINGW
 360         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 361                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 362                         if(!logfilename)
 363                                 asprintf(&logfilename, "%s/log/%s.log", identname);
 364                         if(!confbase) {
 365                                 if(netname)
 366                                         asprintf(&confbase, "%s/%s", installdir, netname);
 367                                 else
 368                                         asprintf(&confbase, "%s", installdir);
 369                         }
 370                 }
 371                 RegCloseKey(key);
 372                 if(*installdir)
 373                         return;
 374         }
 375 #endif
 376
 377         if(!pidfilename)
 378                 asprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
 379
 380         if(!logfilename)
 381                 asprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 382
 383         if(netname) {
 384                 if(!confbase)
 385                         asprintf(&confbase, CONFDIR "/tinc/%s", netname);
 386                 else
 387                         logger(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
 388         } else {
 389                 if(!confbase)
 390                         asprintf(&confbase, CONFDIR "/tinc");
 391         }
 392 }
 393
 394 int main(int argc, char **argv)
 395 {
 396         program_name = argv[0];
 397
 398         setlocale(LC_ALL, "");
 399         bindtextdomain(PACKAGE, LOCALEDIR);
 400         textdomain(PACKAGE);
 401
 402         if(!parse_options(argc, argv))
 403                 return 1;
 404
 405         make_names();
 406
 407         if(show_version) {
 408                 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
 409                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 410                 printf(_("Copyright (C) 1998-2005 Ivo Timmermans, Guus Sliepen and others.\n"
 411                                 "See the AUTHORS file for a complete list.\n\n"
 412                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 413                                 "and you are welcome to redistribute it under certain conditions;\n"
 414                                 "see the file COPYING for details.\n"));
 415
 416                 return 0;
 417         }
 418
 419         if(show_help) {
 420                 usage(false);
 421                 return 0;
 422         }
 423
 424         if(kill_tincd)
 425                 return !kill_other(kill_tincd);
 426
 427         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 428
 429         /* Lock all pages into memory if requested */
 430
 431         if(do_mlock)
 432 #ifdef HAVE_MLOCKALL
 433                 if(mlockall(MCL_CURRENT | MCL_FUTURE)) {
 434                         logger(LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
 435                                    strerror(errno));
 436 #else
 437         {
 438                 logger(LOG_ERR, _("mlockall() not supported on this platform!"));
 439 #endif
 440                 return -1;
 441         }
 442
 443         g_argv = argv;
 444
 445         init_configuration(&config_tree);
 446
 447         /* Slllluuuuuuurrrrp! */
 448
 449         RAND_load_file("/dev/urandom", 1024);
 450
 451         OpenSSL_add_all_algorithms();
 452
 453         if(generate_keys) {
 454                 read_server_config();
 455                 return !keygen(generate_keys);
 456         }
 457
 458         if(!read_server_config())
 459                 return 1;
 460
 461         if(lzo_init() != LZO_E_OK) {
 462                 logger(LOG_ERR, _("Error initializing LZO compressor!"));
 463                 return 1;
 464         }
 465
 466 #ifdef HAVE_MINGW
 467         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 468                 logger(LOG_ERR, _("System call `%s' failed: %s"), "WSAStartup", winerror(GetLastError()));
 469                 return 1;
 470         }
 471
 472         if(!do_detach || !init_service())
 473                 return main2(argc, argv);
 474         else
 475                 return 1;
 476 }
 477
 478 int main2(int argc, char **argv)
 479 {
 480 #endif
 481
 482         if(!detach())
 483                 return 1;
 484
 485
 486         /* Setup sockets and open device. */
 487
 488         if(!setup_network_connections())
 489                 goto end;
 490
 491         /* Start main loop. It only exits when tinc is killed. */
 492
 493         status = main_loop();
 494
 495         /* Shutdown properly. */
 496
 497         close_network_connections();
 498
 499         ifdebug(CONNECTIONS)
 500                 dump_device_stats();
 501
 502 end:
 503         logger(LOG_NOTICE, _("Terminating"));
 504
 505 #ifndef HAVE_MINGW
 506         remove_pid(pidfilename);
 507 #endif
 508
 509         return status;
 510 }