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

   1 /*
   2     tincd.c -- the main file for tincd
   3     Copyright (C) 1998-2003 Ivo Timmermans <ivo@o2w.nl>
   4                   2000-2003 Guus Sliepen <guus@sliepen.eu.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: tincd.c,v 1.10.4.90 2003/12/07 14:31:09 guus Exp $
  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 <gnutls/gnutls.h>
  35
  36 #include <lzo1x.h>
  37
  38 #include <getopt.h>
  39 #include <pidfile.h>
  40
  41 #include "conf.h"
  42 #include "device.h"
  43 #include "logger.h"
  44 #include "net.h"
  45 #include "netutl.h"
  46 #include "process.h"
  47 #include "protocol.h"
  48 #include "utils.h"
  49 #include "xalloc.h"
  50
  51 /* The name this program was run with. */
  52 char *program_name = NULL;
  53
  54 /* If nonzero, display usage information and exit. */
  55 bool show_help = false;
  56
  57 /* If nonzero, print the version on standard output and exit.  */
  58 bool show_version = false;
  59
  60 /* If nonzero, it will attempt to kill a running tincd and exit. */
  61 int kill_tincd = 0;
  62
  63 /* If nonzero, generate public/private keypair for this host/net. */
  64 int generate_keys = 0;
  65
  66 /* If nonzero, use null ciphers and skip all key exchanges. */
  67 bool bypass_security = false;
  68
  69 /* If nonzero, disable swapping for this process. */
  70 bool do_mlock = false;
  71
  72 /* If nonzero, write log entries to a separate file. */
  73 bool use_logfile = false;
  74
  75 char *identname = NULL;                         /* program name for syslog */
  76 char *pidfilename = NULL;                       /* pid file location */
  77 char *logfilename = NULL;                       /* log file location */
  78 char **g_argv;                                  /* a copy of the cmdline arguments */
  79
  80 static int status;
  81
  82 static struct option const long_options[] = {
  83         {"config", required_argument, NULL, 'c'},
  84         {"kill", optional_argument, NULL, 'k'},
  85         {"net", required_argument, NULL, 'n'},
  86         {"help", no_argument, NULL, 1},
  87         {"version", no_argument, NULL, 2},
  88         {"no-detach", no_argument, NULL, 'D'},
  89         {"generate-keys", optional_argument, NULL, 'K'},
  90         {"debug", optional_argument, NULL, 'd'},
  91         {"bypass-security", no_argument, NULL, 3},
  92         {"mlock", no_argument, NULL, 'L'},
  93         {"logfile", optional_argument, NULL, 4},
  94         {"pidfile", required_argument, NULL, 5},
  95         {NULL, 0, NULL, 0}
  96 };
  97
  98 #ifdef HAVE_MINGW
  99 static struct WSAData wsa_state;
 100 #endif
 101
 102 static void usage(bool status)
 103 {
 104         if(status)
 105                 fprintf(stderr, _("Try `%s --help\' for more information.\n"),
 106                                 program_name);
 107         else {
 108                 printf(_("Usage: %s [option]...\n\n"), program_name);
 109                 printf(_("  -c, --config=DIR           Read configuration options from DIR.\n"
 110                                 "  -D, --no-detach            Don't fork and detach.\n"
 111                                 "  -d, --debug[=LEVEL]        Increase debug level or set it to LEVEL.\n"
 112                                 "  -k, --kill[=SIGNAL]        Attempt to kill a running tincd and exit.\n"
 113                                 "  -n, --net=NETNAME          Connect to net NETNAME.\n"
 114                                 "  -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
 115                                 "  -L, --mlock                Lock tinc into main memory.\n"
 116                                 "      --logfile[=FILENAME]   Write log entries to a logfile.\n"
 117                                 "      --pidfile=FILENAME     Write PID to FILENAME.\n"
 118                                 "      --help                 Display this help and exit.\n"
 119                                 "      --version              Output version information and exit.\n\n"));
 120                 printf(_("Report bugs to tinc@nl.linux.org.\n"));
 121         }
 122 }
 123
 124 static bool parse_options(int argc, char **argv)
 125 {
 126         int r;
 127         int option_index = 0;
 128
 129         while((r = getopt_long(argc, argv, "c:DLd::k::n:K::", long_options, &option_index)) != EOF) {
 130                 switch (r) {
 131                         case 0:                         /* long option */
 132                                 break;
 133
 134                         case 'c':                               /* config file */
 135                                 confbase = xstrdup(optarg);
 136                                 break;
 137
 138                         case 'D':                               /* no detach */
 139                                 do_detach = false;
 140                                 break;
 141
 142                         case 'L':                               /* no detach */
 143                                 do_mlock = true;
 144                                 break;
 145
 146                         case 'd':                               /* inc debug level */
 147                                 if(optarg)
 148                                         debug_level = atoi(optarg);
 149                                 else
 150                                         debug_level++;
 151                                 break;
 152
 153                         case 'k':                               /* kill old tincds */
 154 #ifndef HAVE_MINGW
 155                                 if(optarg) {
 156                                         if(!strcasecmp(optarg, "HUP"))
 157                                                 kill_tincd = SIGHUP;
 158                                         else if(!strcasecmp(optarg, "TERM"))
 159                                                 kill_tincd = SIGTERM;
 160                                         else if(!strcasecmp(optarg, "KILL"))
 161                                                 kill_tincd = SIGKILL;
 162                                         else if(!strcasecmp(optarg, "USR1"))
 163                                                 kill_tincd = SIGUSR1;
 164                                         else if(!strcasecmp(optarg, "USR2"))
 165                                                 kill_tincd = SIGUSR2;
 166                                         else if(!strcasecmp(optarg, "WINCH"))
 167                                                 kill_tincd = SIGWINCH;
 168                                         else if(!strcasecmp(optarg, "INT"))
 169                                                 kill_tincd = SIGINT;
 170                                         else if(!strcasecmp(optarg, "ALRM"))
 171                                                 kill_tincd = SIGALRM;
 172                                         else {
 173                                                 kill_tincd = atoi(optarg);
 174
 175                                                 if(!kill_tincd) {
 176                                                         fprintf(stderr, _("Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n"),
 177                                                                         optarg);
 178                                                         usage(true);
 179                                                         return false;
 180                                                 }
 181                                         }
 182                                 } else
 183                                         kill_tincd = SIGTERM;
 184 #else
 185                                         kill_tincd = 1;
 186 #endif
 187                                 break;
 188
 189                         case 'n':                               /* net name given */
 190                                 netname = xstrdup(optarg);
 191                                 break;
 192
 193                         case 'K':                               /* generate public/private keypair */
 194                                 if(optarg) {
 195                                         generate_keys = atoi(optarg);
 196
 197                                         if(generate_keys < 512) {
 198                                                 fprintf(stderr, _("Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n"),
 199                                                                 optarg);
 200                                                 usage(true);
 201                                                 return false;
 202                                         }
 203
 204                                         generate_keys &= ~7;    /* Round it to bytes */
 205                                 } else
 206                                         generate_keys = 1024;
 207                                 break;
 208
 209                         case 1:                                 /* show help */
 210                                 show_help = true;
 211                                 break;
 212
 213                         case 2:                                 /* show version */
 214                                 show_version = true;
 215                                 break;
 216
 217                         case 3:                                 /* bypass security */
 218                                 bypass_security = true;
 219                                 break;
 220
 221                         case 4:                                 /* write log entries to a file */
 222                                 use_logfile = true;
 223                                 if(optarg)
 224                                         logfilename = xstrdup(optarg);
 225                                 break;
 226
 227                         case 5:                                 /* write PID to a file */
 228                                 pidfilename = xstrdup(optarg);
 229                                 break;
 230
 231                         case '?':
 232                                 usage(true);
 233                                 return false;
 234
 235                         default:
 236                                 break;
 237                 }
 238         }
 239
 240         return true;
 241 }
 242
 243 /* This function prettyprints the key generation process */
 244
 245 static void indicator(int a, int b, void *p)
 246 {
 247         switch (a) {
 248                 case 0:
 249                         fprintf(stderr, ".");
 250                         break;
 251
 252                 case 1:
 253                         fprintf(stderr, "+");
 254                         break;
 255
 256                 case 2:
 257                         fprintf(stderr, "-");
 258                         break;
 259
 260                 case 3:
 261                         switch (b) {
 262                                 case 0:
 263                                         fprintf(stderr, " p\n");
 264                                         break;
 265
 266                                 case 1:
 267                                         fprintf(stderr, " q\n");
 268                                         break;
 269
 270                                 default:
 271                                         fprintf(stderr, "?");
 272                         }
 273                         break;
 274
 275                 default:
 276                         fprintf(stderr, "?");
 277         }
 278 }
 279
 280 /*
 281   Generate a public/private RSA keypair, and ask for a file to store
 282   them in.
 283 */
 284 static bool keygen(int bits)
 285 {
 286         fprintf(stderr, _("Use certtool!\n"));
 287         return false;
 288
 289 #if 0
 290         RSA *rsa_key;
 291         FILE *f;
 292         char *name = NULL;
 293         char *filename;
 294
 295         fprintf(stderr, _("Generating %d bits keys:\n"), bits);
 296         rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
 297
 298         if(!rsa_key) {
 299                 fprintf(stderr, _("Error during key generation!\n"));
 300                 return false;
 301         } else
 302                 fprintf(stderr, _("Done.\n"));
 303
 304         asprintf(&filename, "%s/rsa_key.priv", confbase);
 305         f = ask_and_open(filename, _("private RSA key"), "a");
 306
 307         if(!f)
 308                 return false;
 309
 310 #ifdef HAVE_FCHMOD
 311         /* Make it unreadable for others. */
 312         fchmod(fileno(f), 0600);
 313 #endif
 314
 315         if(ftell(f))
 316                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 317
 318         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 319         fclose(f);
 320         free(filename);
 321
 322         get_config_string(lookup_config(config_tree, "Name"), &name);
 323
 324         if(name)
 325                 asprintf(&filename, "%s/hosts/%s", confbase, name);
 326         else
 327                 asprintf(&filename, "%s/rsa_key.pub", confbase);
 328
 329         f = ask_and_open(filename, _("public RSA key"), "a");
 330
 331         if(!f)
 332                 return false;
 333
 334         if(ftell(f))
 335                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 336
 337         PEM_write_RSAPublicKey(f, rsa_key);
 338         fclose(f);
 339         free(filename);
 340
 341         return true;
 342 #endif
 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         if(!logfilename)
 383                 asprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 384
 385         if(netname) {
 386                 if(!confbase)
 387                         asprintf(&confbase, CONFDIR "/tinc/%s", netname);
 388                 else
 389                         logger(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
 390         } else {
 391                 if(!confbase)
 392                         asprintf(&confbase, CONFDIR "/tinc");
 393         }
 394 }
 395
 396 int main(int argc, char **argv)
 397 {
 398         program_name = argv[0];
 399
 400         setlocale(LC_ALL, "");
 401         bindtextdomain(PACKAGE, LOCALEDIR);
 402         textdomain(PACKAGE);
 403
 404         if(!parse_options(argc, argv))
 405                 return 1;
 406
 407         make_names();
 408
 409         if(show_version) {
 410                 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
 411                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 412                 printf(_("Copyright (C) 1998-2003 Ivo Timmermans, Guus Sliepen and others.\n"
 413                                 "See the AUTHORS file for a complete list.\n\n"
 414                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 415                                 "and you are welcome to redistribute it under certain conditions;\n"
 416                                 "see the file COPYING for details.\n"));
 417
 418                 return 0;
 419         }
 420
 421         if(show_help) {
 422                 usage(false);
 423                 return 0;
 424         }
 425
 426         if(kill_tincd)
 427                 return !kill_other(kill_tincd);
 428
 429         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 430
 431         /* Lock all pages into memory if requested */
 432
 433         if(do_mlock)
 434 #ifdef HAVE_MLOCKALL
 435                 if(mlockall(MCL_CURRENT | MCL_FUTURE)) {
 436                         logger(LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
 437                                    strerror(errno));
 438 #else
 439         {
 440                 logger(LOG_ERR, _("mlockall() not supported on this platform!"));
 441 #endif
 442                 return 1;
 443         }
 444
 445         g_argv = argv;
 446
 447         init_configuration(&config_tree);
 448
 449         /* Slllluuuuuuurrrrp! */
 450
 451         gnutls_global_init();
 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 }