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 1.10.4.83 2003/08/03 09:55:20 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 <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
  43 #include "conf.h"
  44 #include "device.h"
  45 #include "logger.h"
  46 #include "net.h"
  47 #include "netutl.h"
  48 #include "process.h"
  49 #include "protocol.h"
  50 #include "utils.h"
  51 #include "xalloc.h"
  52
  53 /* The name this program was run with. */
  54 char *program_name = NULL;
  55
  56 /* If nonzero, display usage information and exit. */
  57 bool show_help = false;
  58
  59 /* If nonzero, print the version on standard output and exit.  */
  60 bool show_version = false;
  61
  62 /* If nonzero, it will attempt to kill a running tincd and exit. */
  63 int kill_tincd = 0;
  64
  65 /* If nonzero, generate public/private keypair for this host/net. */
  66 int generate_keys = 0;
  67
  68 /* If nonzero, use null ciphers and skip all key exchanges. */
  69 bool bypass_security = false;
  70
  71 /* If nonzero, disable swapping for this process. */
  72 bool do_mlock = false;
  73
  74 /* If nonzero, write log entries to a separate file. */
  75 bool use_logfile = false;
  76
  77 char *identname = NULL;                         /* program name for syslog */
  78 char *pidfilename = NULL;                       /* pid file location */
  79 char *logfilename = NULL;                       /* log file location */
  80 char **g_argv;                                  /* a copy of the cmdline arguments */
  81
  82 static int status;
  83
  84 static struct option const long_options[] = {
  85         {"config", required_argument, NULL, 'c'},
  86         {"kill", optional_argument, NULL, 'k'},
  87         {"net", required_argument, NULL, 'n'},
  88         {"help", no_argument, NULL, 1},
  89         {"version", no_argument, NULL, 2},
  90         {"no-detach", no_argument, NULL, 'D'},
  91         {"generate-keys", optional_argument, NULL, 'K'},
  92         {"debug", optional_argument, NULL, 'd'},
  93         {"bypass-security", no_argument, NULL, 3},
  94         {"mlock", no_argument, NULL, 'L'},
  95         {"logfile", optional_argument, NULL, 4},
  96         {"pidfile", required_argument, NULL, 5},
  97         {NULL, 0, NULL, 0}
  98 };
  99
 100 #ifdef HAVE_MINGW
 101 static struct WSAData wsa_state;
 102 #endif
 103
 104 static void usage(bool status)
 105 {
 106         if(status)
 107                 fprintf(stderr, _("Try `%s --help\' for more information.\n"),
 108                                 program_name);
 109         else {
 110                 printf(_("Usage: %s [option]...\n\n"), program_name);
 111                 printf(_("  -c, --config=DIR           Read configuration options from DIR.\n"
 112                                 "  -D, --no-detach            Don't fork and detach.\n"
 113                                 "  -d, --debug[=LEVEL]        Increase debug level or set it to LEVEL.\n"
 114                                 "  -k, --kill[=SIGNAL]        Attempt to kill a running tincd and exit.\n"
 115                                 "  -n, --net=NETNAME          Connect to net NETNAME.\n"
 116                                 "  -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
 117                                 "  -L, --mlock                Lock tinc into main memory.\n"
 118                                 "      --logfile[=FILENAME]   Write log entries to a logfile.\n"
 119                                 "      --pidfile=FILENAME     Write PID to FILENAME.\n"
 120                                 "      --help                 Display this help and exit.\n"
 121                                 "      --version              Output version information and exit.\n\n"));
 122                 printf(_("Report bugs to tinc@nl.linux.org.\n"));
 123         }
 124 }
 125
 126 static bool parse_options(int argc, char **argv)
 127 {
 128         int r;
 129         int option_index = 0;
 130
 131         while((r = getopt_long(argc, argv, "c:DLd::k::n:K::", long_options, &option_index)) != EOF) {
 132                 switch (r) {
 133                         case 0:                         /* long option */
 134                                 break;
 135
 136                         case 'c':                               /* config file */
 137                                 confbase = xstrdup(optarg);
 138                                 break;
 139
 140                         case 'D':                               /* no detach */
 141                                 do_detach = false;
 142                                 break;
 143
 144                         case 'L':                               /* no detach */
 145                                 do_mlock = true;
 146                                 break;
 147
 148                         case 'd':                               /* inc debug level */
 149                                 if(optarg)
 150                                         debug_level = atoi(optarg);
 151                                 else
 152                                         debug_level++;
 153                                 break;
 154
 155                         case 'k':                               /* kill old tincds */
 156 #ifndef HAVE_MINGW
 157                                 if(optarg) {
 158                                         if(!strcasecmp(optarg, "HUP"))
 159                                                 kill_tincd = SIGHUP;
 160                                         else if(!strcasecmp(optarg, "TERM"))
 161                                                 kill_tincd = SIGTERM;
 162                                         else if(!strcasecmp(optarg, "KILL"))
 163                                                 kill_tincd = SIGKILL;
 164                                         else if(!strcasecmp(optarg, "USR1"))
 165                                                 kill_tincd = SIGUSR1;
 166                                         else if(!strcasecmp(optarg, "USR2"))
 167                                                 kill_tincd = SIGUSR2;
 168                                         else if(!strcasecmp(optarg, "WINCH"))
 169                                                 kill_tincd = SIGWINCH;
 170                                         else if(!strcasecmp(optarg, "INT"))
 171                                                 kill_tincd = SIGINT;
 172                                         else if(!strcasecmp(optarg, "ALRM"))
 173                                                 kill_tincd = SIGALRM;
 174                                         else {
 175                                                 kill_tincd = atoi(optarg);
 176
 177                                                 if(!kill_tincd) {
 178                                                         fprintf(stderr, _("Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n"),
 179                                                                         optarg);
 180                                                         usage(true);
 181                                                         return false;
 182                                                 }
 183                                         }
 184                                 } else
 185                                         kill_tincd = SIGTERM;
 186 #else
 187                                         kill_tincd = 1;
 188 #endif
 189                                 break;
 190
 191                         case 'n':                               /* net name given */
 192                                 netname = xstrdup(optarg);
 193                                 break;
 194
 195                         case 'K':                               /* generate public/private keypair */
 196                                 if(optarg) {
 197                                         generate_keys = atoi(optarg);
 198
 199                                         if(generate_keys < 512) {
 200                                                 fprintf(stderr, _("Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n"),
 201                                                                 optarg);
 202                                                 usage(true);
 203                                                 return false;
 204                                         }
 205
 206                                         generate_keys &= ~7;    /* Round it to bytes */
 207                                 } else
 208                                         generate_keys = 1024;
 209                                 break;
 210
 211                         case 1:                                 /* show help */
 212                                 show_help = true;
 213                                 break;
 214
 215                         case 2:                                 /* show version */
 216                                 show_version = true;
 217                                 break;
 218
 219                         case 3:                                 /* bypass security */
 220                                 bypass_security = true;
 221                                 break;
 222
 223                         case 4:                                 /* write log entries to a file */
 224                                 use_logfile = true;
 225                                 if(optarg)
 226                                         logfilename = xstrdup(optarg);
 227                                 break;
 228
 229                         case 5:                                 /* write PID to a file */
 230                                 pidfilename = xstrdup(optarg);
 231                                 break;
 232
 233                         case '?':
 234                                 usage(true);
 235                                 return false;
 236
 237                         default:
 238                                 break;
 239                 }
 240         }
 241
 242         return true;
 243 }
 244
 245 /* This function prettyprints the key generation process */
 246
 247 static void indicator(int a, int b, void *p)
 248 {
 249         switch (a) {
 250                 case 0:
 251                         fprintf(stderr, ".");
 252                         break;
 253
 254                 case 1:
 255                         fprintf(stderr, "+");
 256                         break;
 257
 258                 case 2:
 259                         fprintf(stderr, "-");
 260                         break;
 261
 262                 case 3:
 263                         switch (b) {
 264                                 case 0:
 265                                         fprintf(stderr, " p\n");
 266                                         break;
 267
 268                                 case 1:
 269                                         fprintf(stderr, " q\n");
 270                                         break;
 271
 272                                 default:
 273                                         fprintf(stderr, "?");
 274                         }
 275                         break;
 276
 277                 default:
 278                         fprintf(stderr, "?");
 279         }
 280 }
 281
 282 /*
 283   Generate a public/private RSA keypair, and ask for a file to store
 284   them in.
 285 */
 286 static bool keygen(int bits)
 287 {
 288         RSA *rsa_key;
 289         FILE *f;
 290         char *name = NULL;
 291         char *filename;
 292
 293         fprintf(stderr, _("Generating %d bits keys:\n"), bits);
 294         rsa_key = RSA_generate_key(bits, 0xFFFF, indicator, NULL);
 295
 296         if(!rsa_key) {
 297                 fprintf(stderr, _("Error during key generation!\n"));
 298                 return false;
 299         } else
 300                 fprintf(stderr, _("Done.\n"));
 301
 302         asprintf(&filename, "%s/rsa_key.priv", confbase);
 303         f = ask_and_safe_open(filename, _("private RSA key"), true, "a");
 304
 305         if(!f)
 306                 return false;
 307
 308         if(ftell(f))
 309                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 310
 311         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 312         fclose(f);
 313         free(filename);
 314
 315         get_config_string(lookup_config(config_tree, "Name"), &name);
 316
 317         if(name)
 318                 asprintf(&filename, "%s/hosts/%s", confbase, name);
 319         else
 320                 asprintf(&filename, "%s/rsa_key.pub", confbase);
 321
 322         f = ask_and_safe_open(filename, _("public RSA key"), false, "a");
 323
 324         if(!f)
 325                 return false;
 326
 327         if(ftell(f))
 328                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 329
 330         PEM_write_RSAPublicKey(f, rsa_key);
 331         fclose(f);
 332         free(filename);
 333
 334         return true;
 335 }
 336
 337 /*
 338   Set all files and paths according to netname
 339 */
 340 static void make_names(void)
 341 {
 342         if(netname)
 343                 asprintf(&identname, "tinc.%s", netname);
 344         else
 345                 identname = xstrdup("tinc");
 346
 347         if(!pidfilename)
 348                 asprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
 349
 350         if(!logfilename)
 351                 asprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 352
 353         if(netname) {
 354                 if(!confbase)
 355                         asprintf(&confbase, "%s/tinc/%s", CONFDIR, netname);
 356                 else
 357                         logger(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
 358         } else {
 359                 if(!confbase)
 360                         asprintf(&confbase, "%s/tinc", CONFDIR);
 361         }
 362 }
 363
 364 int main(int argc, char **argv)
 365 {
 366         program_name = argv[0];
 367
 368         setlocale(LC_ALL, "");
 369         bindtextdomain(PACKAGE, LOCALEDIR);
 370         textdomain(PACKAGE);
 371
 372         if(!parse_options(argc, argv))
 373                 return 1;
 374
 375         make_names();
 376
 377         if(show_version) {
 378                 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
 379                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 380                 printf(_("Copyright (C) 1998-2003 Ivo Timmermans, Guus Sliepen and others.\n"
 381                                 "See the AUTHORS file for a complete list.\n\n"
 382                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 383                                 "and you are welcome to redistribute it under certain conditions;\n"
 384                                 "see the file COPYING for details.\n"));
 385
 386                 return 0;
 387         }
 388
 389         if(show_help) {
 390                 usage(false);
 391                 return 0;
 392         }
 393
 394         if(kill_tincd)
 395                 return !kill_other(kill_tincd);
 396
 397         openlogger("tinc", LOGMODE_STDERR);
 398
 399         /* Lock all pages into memory if requested */
 400
 401         if(do_mlock)
 402 #ifdef HAVE_MLOCKALL
 403                 if(mlockall(MCL_CURRENT | MCL_FUTURE)) {
 404                         logger(LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
 405                                    strerror(errno));
 406 #else
 407         {
 408                 logger(LOG_ERR, _("mlockall() not supported on this platform!"));
 409 #endif
 410                 return -1;
 411         }
 412
 413         g_argv = argv;
 414
 415         init_configuration(&config_tree);
 416
 417         /* Slllluuuuuuurrrrp! */
 418
 419         RAND_load_file("/dev/urandom", 1024);
 420
 421         OpenSSL_add_all_algorithms();
 422
 423         if(generate_keys) {
 424                 read_server_config();
 425                 return !keygen(generate_keys);
 426         }
 427
 428         if(!read_server_config())
 429                 return 1;
 430
 431         if(lzo_init() != LZO_E_OK) {
 432                 logger(LOG_ERR, _("Error initializing LZO compressor!"));
 433                 return 1;
 434         }
 435
 436 #ifdef HAVE_MINGW
 437         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 438                 logger(LOG_ERR, _("System call `%s' failed: %s"), "WSAStartup", winerror(GetLastError()));
 439                 return 1;
 440         }
 441
 442         if(!do_detach || !init_service())
 443                 return main2(argc, argv);
 444         else
 445                 return 1;
 446 }
 447
 448 int main2(int argc, char **argv)
 449 {
 450 #endif
 451
 452         if(!detach())
 453                 return 1;
 454
 455
 456         /* Setup sockets and open device. If it doesn't work, don't give up but try again. */
 457
 458         while(!setup_network_connections()) {
 459                 if(do_detach) {
 460                         logger(LOG_NOTICE, _("Restarting in %d seconds!"), maxtimeout);
 461                         sleep(maxtimeout);
 462                 } else {
 463                         logger(LOG_ERR, _("Not restarting."));
 464                         return 1;
 465                 }
 466         }
 467
 468         /* Start main loop. It only exits when tinc is killed. */
 469
 470         status = main_loop();
 471
 472         /* Shutdown properly. */
 473
 474         close_network_connections();
 475
 476         ifdebug(CONNECTIONS)
 477                 dump_device_stats();
 478
 479         logger(LOG_NOTICE, _("Terminating"));
 480         return status;
 481 }