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 1.10.4.77 2003/07/28 22:06:09 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 <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 "conf.h"
  42 #include "logger.h"
  43 #include "net.h"
  44 #include "netutl.h"
  45 #include "process.h"
  46 #include "protocol.h"
  47 #include "utils.h"
  48 #include "xalloc.h"
  49
  50 /* The name this program was run with. */
  51 char *program_name = NULL;
  52
  53 /* If nonzero, display usage information and exit. */
  54 bool show_help = false;
  55
  56 /* If nonzero, print the version on standard output and exit.  */
  57 bool show_version = false;
  58
  59 /* If nonzero, it will attempt to kill a running tincd and exit. */
  60 int kill_tincd = 0;
  61
  62 /* If nonzero, generate public/private keypair for this host/net. */
  63 int generate_keys = 0;
  64
  65 /* If nonzero, use null ciphers and skip all key exchanges. */
  66 bool bypass_security = false;
  67
  68 /* If nonzero, disable swapping for this process. */
  69 bool do_mlock = false;
  70
  71 /* If nonzero, write log entries to a separate file. */
  72 bool use_logfile = false;
  73
  74 char *identname = NULL;                         /* program name for syslog */
  75 char *pidfilename = NULL;                       /* pid file location */
  76 char *logfilename = NULL;                       /* log file location */
  77 char **g_argv;                                  /* a copy of the cmdline arguments */
  78 char **environment;                             /* A pointer to the environment on startup */
  79
  80 static struct option const long_options[] = {
  81         {"config", required_argument, NULL, 'c'},
  82         {"kill", optional_argument, NULL, 'k'},
  83         {"net", required_argument, NULL, 'n'},
  84         {"help", no_argument, NULL, 1},
  85         {"version", no_argument, NULL, 2},
  86         {"no-detach", no_argument, NULL, 'D'},
  87         {"generate-keys", optional_argument, NULL, 'K'},
  88         {"debug", optional_argument, NULL, 'd'},
  89         {"bypass-security", no_argument, NULL, 3},
  90         {"mlock", no_argument, NULL, 'L'},
  91         {"logfile", optional_argument, NULL, 4},
  92         {"pidfile", required_argument, NULL, 5},
  93         {NULL, 0, NULL, 0}
  94 };
  95
  96 static void usage(bool status)
  97 {
  98         if(status)
  99                 fprintf(stderr, _("Try `%s --help\' for more information.\n"),
 100                                 program_name);
 101         else {
 102                 printf(_("Usage: %s [option]...\n\n"), program_name);
 103                 printf(_("  -c, --config=DIR           Read configuration options from DIR.\n"
 104                                 "  -D, --no-detach            Don't fork and detach.\n"
 105                                 "  -d, --debug[=LEVEL]        Increase debug level or set it to LEVEL.\n"
 106                                 "  -k, --kill[=SIGNAL]        Attempt to kill a running tincd and exit.\n"
 107                                 "  -n, --net=NETNAME          Connect to net NETNAME.\n"
 108                                 "  -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
 109                                 "  -L, --mlock                Lock tinc into main memory.\n"
 110                                 "      --logfile[=FILENAME]   Write log entries to a logfile.\n"
 111                                 "      --pidfile=FILENAME     Write PID to FILENAME.\n"
 112                                 "      --help                 Display this help and exit.\n"
 113                                 "      --version              Output version information and exit.\n\n"));
 114                 printf(_("Report bugs to tinc@nl.linux.org.\n"));
 115         }
 116
 117         exit(status);
 118 }
 119
 120 static void parse_options(int argc, char **argv, char **envp)
 121 {
 122         int r;
 123         int option_index = 0;
 124
 125         while((r = getopt_long(argc, argv, "c:DLd::k::n:K::", long_options, &option_index)) != EOF) {
 126                 switch (r) {
 127                         case 0:                         /* long option */
 128                                 break;
 129
 130                         case 'c':                               /* config file */
 131                                 confbase = xstrdup(optarg);
 132                                 break;
 133
 134                         case 'D':                               /* no detach */
 135                                 do_detach = false;
 136                                 break;
 137
 138                         case 'L':                               /* no detach */
 139                                 do_mlock = true;
 140                                 break;
 141
 142                         case 'd':                               /* inc debug level */
 143                                 if(optarg)
 144                                         debug_level = atoi(optarg);
 145                                 else
 146                                         debug_level++;
 147                                 break;
 148
 149                         case 'k':                               /* kill old tincds */
 150 #ifndef HAVE_MINGW
 151                                 if(optarg) {
 152                                         if(!strcasecmp(optarg, "HUP"))
 153                                                 kill_tincd = SIGHUP;
 154                                         else if(!strcasecmp(optarg, "TERM"))
 155                                                 kill_tincd = SIGTERM;
 156                                         else if(!strcasecmp(optarg, "KILL"))
 157                                                 kill_tincd = SIGKILL;
 158                                         else if(!strcasecmp(optarg, "USR1"))
 159                                                 kill_tincd = SIGUSR1;
 160                                         else if(!strcasecmp(optarg, "USR2"))
 161                                                 kill_tincd = SIGUSR2;
 162                                         else if(!strcasecmp(optarg, "WINCH"))
 163                                                 kill_tincd = SIGWINCH;
 164                                         else if(!strcasecmp(optarg, "INT"))
 165                                                 kill_tincd = SIGINT;
 166                                         else if(!strcasecmp(optarg, "ALRM"))
 167                                                 kill_tincd = SIGALRM;
 168                                         else {
 169                                                 kill_tincd = atoi(optarg);
 170
 171                                                 if(!kill_tincd) {
 172                                                         fprintf(stderr, _("Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n"),
 173                                                                         optarg);
 174                                                         usage(true);
 175                                                 }
 176                                         }
 177                                 } else
 178                                         kill_tincd = SIGTERM;
 179 #endif
 180                                 break;
 181
 182                         case 'n':                               /* net name given */
 183                                 netname = xstrdup(optarg);
 184                                 break;
 185
 186                         case 'K':                               /* generate public/private keypair */
 187                                 if(optarg) {
 188                                         generate_keys = atoi(optarg);
 189
 190                                         if(generate_keys < 512) {
 191                                                 fprintf(stderr, _("Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n"),
 192                                                                 optarg);
 193                                                 usage(true);
 194                                         }
 195
 196                                         generate_keys &= ~7;    /* Round it to bytes */
 197                                 } else
 198                                         generate_keys = 1024;
 199                                 break;
 200
 201                         case 1:                                 /* show help */
 202                                 show_help = true;
 203                                 break;
 204
 205                         case 2:                                 /* show version */
 206                                 show_version = true;
 207                                 break;
 208
 209                         case 3:                                 /* bypass security */
 210                                 bypass_security = true;
 211                                 break;
 212
 213                         case 4:                                 /* write log entries to a file */
 214                                 use_logfile = true;
 215                                 if(optarg)
 216                                         logfilename = xstrdup(optarg);
 217                                 break;
 218
 219                         case 5:                                 /* write PID to a file */
 220                                 pidfilename = xstrdup(optarg);
 221                                 break;
 222
 223                         case '?':
 224                                 usage(true);
 225
 226                         default:
 227                                 break;
 228                 }
 229         }
 230 }
 231
 232 /* This function prettyprints the key generation process */
 233
 234 static void indicator(int a, int b, void *p)
 235 {
 236         switch (a) {
 237                 case 0:
 238                         fprintf(stderr, ".");
 239                         break;
 240
 241                 case 1:
 242                         fprintf(stderr, "+");
 243                         break;
 244
 245                 case 2:
 246                         fprintf(stderr, "-");
 247                         break;
 248
 249                 case 3:
 250                         switch (b) {
 251                                 case 0:
 252                                         fprintf(stderr, " p\n");
 253                                         break;
 254
 255                                 case 1:
 256                                         fprintf(stderr, " q\n");
 257                                         break;
 258
 259                                 default:
 260                                         fprintf(stderr, "?");
 261                         }
 262                         break;
 263
 264                 default:
 265                         fprintf(stderr, "?");
 266         }
 267 }
 268
 269 /*
 270   Generate a public/private RSA keypair, and ask for a file to store
 271   them in.
 272 */
 273 static bool keygen(int bits)
 274 {
 275         RSA *rsa_key;
 276         FILE *f;
 277         char *name = NULL;
 278         char *filename;
 279
 280         fprintf(stderr, _("Generating %d bits keys:\n"), bits);
 281         rsa_key = RSA_generate_key(bits, 0xFFFF, indicator, NULL);
 282
 283         if(!rsa_key) {
 284                 fprintf(stderr, _("Error during key generation!\n"));
 285                 return false;
 286         } else
 287                 fprintf(stderr, _("Done.\n"));
 288
 289         asprintf(&filename, "%s/rsa_key.priv", confbase);
 290         f = ask_and_safe_open(filename, _("private RSA key"), true, "a");
 291
 292         if(!f)
 293                 return false;
 294
 295         if(ftell(f))
 296                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 297
 298         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 299         fclose(f);
 300         free(filename);
 301
 302         get_config_string(lookup_config(config_tree, "Name"), &name);
 303
 304         if(name)
 305                 asprintf(&filename, "%s/hosts/%s", confbase, name);
 306         else
 307                 asprintf(&filename, "%s/rsa_key.pub", confbase);
 308
 309         f = ask_and_safe_open(filename, _("public RSA key"), false, "a");
 310
 311         if(!f)
 312                 return false;
 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_RSAPublicKey(f, rsa_key);
 318         fclose(f);
 319         free(filename);
 320
 321         return true;
 322 }
 323
 324 /*
 325   Set all files and paths according to netname
 326 */
 327 static void make_names(void)
 328 {
 329         if(netname)
 330                 asprintf(&identname, "tinc.%s", netname);
 331         else
 332                 identname = xstrdup("tinc");
 333
 334         if(!pidfilename)
 335                 asprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
 336
 337         if(!logfilename)
 338                 asprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 339
 340         if(netname) {
 341                 if(!confbase)
 342                         asprintf(&confbase, "%s/tinc/%s", CONFDIR, netname);
 343                 else
 344                         logger(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
 345         } else {
 346                 if(!confbase)
 347                         asprintf(&confbase, "%s/tinc", CONFDIR);
 348         }
 349 }
 350
 351 int main(int argc, char **argv, char **envp)
 352 {
 353         program_name = argv[0];
 354
 355         setlocale(LC_ALL, "");
 356         bindtextdomain(PACKAGE, LOCALEDIR);
 357         textdomain(PACKAGE);
 358
 359         environment = envp;
 360         parse_options(argc, argv, envp);
 361         make_names();
 362
 363         if(show_version) {
 364                 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
 365                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 366                 printf(_("Copyright (C) 1998-2003 Ivo Timmermans, Guus Sliepen and others.\n"
 367                                 "See the AUTHORS file for a complete list.\n\n"
 368                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 369                                 "and you are welcome to redistribute it under certain conditions;\n"
 370                                 "see the file COPYING for details.\n"));
 371
 372                 return 0;
 373         }
 374
 375         if(show_help)
 376                 usage(false);
 377
 378         if(kill_tincd)
 379                 exit(!kill_other(kill_tincd));
 380
 381         openlogger("tinc", LOGMODE_STDERR);
 382
 383         /* Lock all pages into memory if requested */
 384
 385         if(do_mlock)
 386 #ifdef HAVE_MLOCKALL
 387                 if(mlockall(MCL_CURRENT | MCL_FUTURE)) {
 388                         logger(LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
 389                                    strerror(errno));
 390 #else
 391         {
 392                 logger(LOG_ERR, _("mlockall() not supported on this platform!"));
 393 #endif
 394                 return -1;
 395         }
 396
 397         g_argv = argv;
 398
 399         init_configuration(&config_tree);
 400
 401         /* Slllluuuuuuurrrrp! */
 402
 403         RAND_load_file("/dev/urandom", 1024);
 404
 405         OpenSSL_add_all_algorithms();
 406
 407         if(generate_keys) {
 408                 read_server_config();
 409                 exit(!keygen(generate_keys));
 410         }
 411
 412         if(!read_server_config())
 413                 exit(1);
 414
 415         if(lzo_init() != LZO_E_OK) {
 416                 logger(LOG_ERR, _("Error initializing LZO compressor!"));
 417                 exit(1);
 418         }
 419
 420         if(!detach())
 421                 exit(1);
 422
 423         for(;;) {
 424                 if(setup_network_connections()) {
 425                         main_loop();
 426                         cleanup_and_exit(1);
 427                 }
 428
 429                 logger(LOG_ERR, _("Unrecoverable error"));
 430                 cp_trace();
 431
 432                 if(do_detach) {
 433                         logger(LOG_NOTICE, _("Restarting in %d seconds!"), maxtimeout);
 434                         sleep(maxtimeout);
 435                 } else {
 436                         logger(LOG_ERR, _("Not restarting."));
 437                         exit(1);
 438                 }
 439         }
 440 }