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 1.10.4.79 2003/07/30 11:50:45 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 "logger.h"
  45 #include "net.h"
  46 #include "netutl.h"
  47 #include "process.h"
  48 #include "protocol.h"
  49 #include "utils.h"
  50 #include "xalloc.h"
  51
  52 /* The name this program was run with. */
  53 char *program_name = NULL;
  54
  55 /* If nonzero, display usage information and exit. */
  56 bool show_help = false;
  57
  58 /* If nonzero, print the version on standard output and exit.  */
  59 bool show_version = false;
  60
  61 /* If nonzero, it will attempt to kill a running tincd and exit. */
  62 int kill_tincd = 0;
  63
  64 /* If nonzero, generate public/private keypair for this host/net. */
  65 int generate_keys = 0;
  66
  67 /* If nonzero, use null ciphers and skip all key exchanges. */
  68 bool bypass_security = false;
  69
  70 /* If nonzero, disable swapping for this process. */
  71 bool do_mlock = false;
  72
  73 /* If nonzero, write log entries to a separate file. */
  74 bool use_logfile = false;
  75
  76 char *identname = NULL;                         /* program name for syslog */
  77 char *pidfilename = NULL;                       /* pid file location */
  78 char *logfilename = NULL;                       /* log file location */
  79 char **g_argv;                                  /* a copy of the cmdline arguments */
  80 char **environment;                             /* A pointer to the environment on startup */
  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         exit(status);
 124 }
 125
 126 static void parse_options(int argc, char **argv, char **envp)
 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                                                 }
 182                                         }
 183                                 } else
 184                                         kill_tincd = SIGTERM;
 185 #endif
 186                                 break;
 187
 188                         case 'n':                               /* net name given */
 189                                 netname = xstrdup(optarg);
 190                                 break;
 191
 192                         case 'K':                               /* generate public/private keypair */
 193                                 if(optarg) {
 194                                         generate_keys = atoi(optarg);
 195
 196                                         if(generate_keys < 512) {
 197                                                 fprintf(stderr, _("Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n"),
 198                                                                 optarg);
 199                                                 usage(true);
 200                                         }
 201
 202                                         generate_keys &= ~7;    /* Round it to bytes */
 203                                 } else
 204                                         generate_keys = 1024;
 205                                 break;
 206
 207                         case 1:                                 /* show help */
 208                                 show_help = true;
 209                                 break;
 210
 211                         case 2:                                 /* show version */
 212                                 show_version = true;
 213                                 break;
 214
 215                         case 3:                                 /* bypass security */
 216                                 bypass_security = true;
 217                                 break;
 218
 219                         case 4:                                 /* write log entries to a file */
 220                                 use_logfile = true;
 221                                 if(optarg)
 222                                         logfilename = xstrdup(optarg);
 223                                 break;
 224
 225                         case 5:                                 /* write PID to a file */
 226                                 pidfilename = xstrdup(optarg);
 227                                 break;
 228
 229                         case '?':
 230                                 usage(true);
 231
 232                         default:
 233                                 break;
 234                 }
 235         }
 236 }
 237
 238 /* This function prettyprints the key generation process */
 239
 240 static void indicator(int a, int b, void *p)
 241 {
 242         switch (a) {
 243                 case 0:
 244                         fprintf(stderr, ".");
 245                         break;
 246
 247                 case 1:
 248                         fprintf(stderr, "+");
 249                         break;
 250
 251                 case 2:
 252                         fprintf(stderr, "-");
 253                         break;
 254
 255                 case 3:
 256                         switch (b) {
 257                                 case 0:
 258                                         fprintf(stderr, " p\n");
 259                                         break;
 260
 261                                 case 1:
 262                                         fprintf(stderr, " q\n");
 263                                         break;
 264
 265                                 default:
 266                                         fprintf(stderr, "?");
 267                         }
 268                         break;
 269
 270                 default:
 271                         fprintf(stderr, "?");
 272         }
 273 }
 274
 275 /*
 276   Generate a public/private RSA keypair, and ask for a file to store
 277   them in.
 278 */
 279 static bool keygen(int bits)
 280 {
 281         RSA *rsa_key;
 282         FILE *f;
 283         char *name = NULL;
 284         char *filename;
 285
 286         fprintf(stderr, _("Generating %d bits keys:\n"), bits);
 287         rsa_key = RSA_generate_key(bits, 0xFFFF, indicator, NULL);
 288
 289         if(!rsa_key) {
 290                 fprintf(stderr, _("Error during key generation!\n"));
 291                 return false;
 292         } else
 293                 fprintf(stderr, _("Done.\n"));
 294
 295         asprintf(&filename, "%s/rsa_key.priv", confbase);
 296         f = ask_and_safe_open(filename, _("private RSA key"), true, "a");
 297
 298         if(!f)
 299                 return false;
 300
 301         if(ftell(f))
 302                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 303
 304         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 305         fclose(f);
 306         free(filename);
 307
 308         get_config_string(lookup_config(config_tree, "Name"), &name);
 309
 310         if(name)
 311                 asprintf(&filename, "%s/hosts/%s", confbase, name);
 312         else
 313                 asprintf(&filename, "%s/rsa_key.pub", confbase);
 314
 315         f = ask_and_safe_open(filename, _("public RSA key"), false, "a");
 316
 317         if(!f)
 318                 return false;
 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_RSAPublicKey(f, rsa_key);
 324         fclose(f);
 325         free(filename);
 326
 327         return true;
 328 }
 329
 330 /*
 331   Set all files and paths according to netname
 332 */
 333 static void make_names(void)
 334 {
 335         if(netname)
 336                 asprintf(&identname, "tinc.%s", netname);
 337         else
 338                 identname = xstrdup("tinc");
 339
 340         if(!pidfilename)
 341                 asprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
 342
 343         if(!logfilename)
 344                 asprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 345
 346         if(netname) {
 347                 if(!confbase)
 348                         asprintf(&confbase, "%s/tinc/%s", CONFDIR, netname);
 349                 else
 350                         logger(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
 351         } else {
 352                 if(!confbase)
 353                         asprintf(&confbase, "%s/tinc", CONFDIR);
 354         }
 355 }
 356
 357 int main(int argc, char **argv, char **envp)
 358 {
 359         program_name = argv[0];
 360
 361         setlocale(LC_ALL, "");
 362         bindtextdomain(PACKAGE, LOCALEDIR);
 363         textdomain(PACKAGE);
 364
 365         environment = envp;
 366         parse_options(argc, argv, envp);
 367         make_names();
 368
 369         if(show_version) {
 370                 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
 371                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 372                 printf(_("Copyright (C) 1998-2003 Ivo Timmermans, Guus Sliepen and others.\n"
 373                                 "See the AUTHORS file for a complete list.\n\n"
 374                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 375                                 "and you are welcome to redistribute it under certain conditions;\n"
 376                                 "see the file COPYING for details.\n"));
 377
 378                 return 0;
 379         }
 380
 381         if(show_help)
 382                 usage(false);
 383
 384         if(kill_tincd)
 385                 exit(!kill_other(kill_tincd));
 386
 387         openlogger("tinc", LOGMODE_STDERR);
 388
 389         /* Lock all pages into memory if requested */
 390
 391         if(do_mlock)
 392 #ifdef HAVE_MLOCKALL
 393                 if(mlockall(MCL_CURRENT | MCL_FUTURE)) {
 394                         logger(LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
 395                                    strerror(errno));
 396 #else
 397         {
 398                 logger(LOG_ERR, _("mlockall() not supported on this platform!"));
 399 #endif
 400                 return -1;
 401         }
 402
 403         g_argv = argv;
 404
 405         init_configuration(&config_tree);
 406
 407         /* Slllluuuuuuurrrrp! */
 408
 409         RAND_load_file("/dev/urandom", 1024);
 410
 411         OpenSSL_add_all_algorithms();
 412
 413         if(generate_keys) {
 414                 read_server_config();
 415                 exit(!keygen(generate_keys));
 416         }
 417
 418         if(!read_server_config())
 419                 exit(1);
 420
 421         if(lzo_init() != LZO_E_OK) {
 422                 logger(LOG_ERR, _("Error initializing LZO compressor!"));
 423                 exit(1);
 424         }
 425
 426 #ifdef HAVE_MINGW
 427         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 428                 logger(LOG_ERR, _("System call `%s' failed: %s"), "WSAStartup", strerror(errno));
 429                 exit(1);
 430         }
 431 #endif
 432
 433         if(!detach())
 434                 exit(1);
 435
 436         for(;;) {
 437                 if(setup_network_connections()) {
 438                         main_loop();
 439                         cleanup_and_exit(1);
 440                 }
 441
 442                 logger(LOG_ERR, _("Unrecoverable error"));
 443                 cp_trace();
 444
 445                 if(do_detach) {
 446                         logger(LOG_NOTICE, _("Restarting in %d seconds!"), maxtimeout);
 447                         sleep(maxtimeout);
 448                 } else {
 449                         logger(LOG_ERR, _("Not restarting."));
 450                         exit(1);
 451                 }
 452         }
 453 }