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 1.10.4.73 2003/07/17 15:06:27 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 #include <sys/mman.h>
  31
  32 #include <openssl/rand.h>
  33 #include <openssl/rsa.h>
  34 #include <openssl/pem.h>
  35 #include <openssl/evp.h>
  36
  37 #include <lzo1x.h>
  38
  39 #include "conf.h"
  40 #include "logger.h"
  41 #include "net.h"
  42 #include "netutl.h"
  43 #include "process.h"
  44 #include "protocol.h"
  45 #include "utils.h"
  46 #include "xalloc.h"
  47
  48 /* The name this program was run with. */
  49 char *program_name = NULL;
  50
  51 /* If nonzero, display usage information and exit. */
  52 int show_help = 0;
  53
  54 /* If nonzero, print the version on standard output and exit.  */
  55 int show_version = 0;
  56
  57 /* If nonzero, it will attempt to kill a running tincd and exit. */
  58 int kill_tincd = 0;
  59
  60 /* If nonzero, generate public/private keypair for this host/net. */
  61 int generate_keys = 0;
  62
  63 /* If nonzero, use null ciphers and skip all key exchanges. */
  64 int bypass_security = 0;
  65
  66 /* If nonzero, disable swapping for this process. */
  67 int do_mlock = 0;
  68
  69 /* If nonzero, write log entries to a separate file. */
  70 int use_logfile = 0;
  71
  72 char *identname = NULL;                         /* program name for syslog */
  73 char *pidfilename = NULL;                       /* pid file location */
  74 char *logfilename = NULL;                       /* log file location */
  75 char **g_argv;                                  /* a copy of the cmdline arguments */
  76 char **environment;                             /* A pointer to the environment on
  77                                                                    startup */
  78
  79 static struct option const long_options[] = {
  80         {"config", required_argument, NULL, 'c'},
  81         {"kill", optional_argument, NULL, 'k'},
  82         {"net", required_argument, NULL, 'n'},
  83         {"help", no_argument, &show_help, 1},
  84         {"version", no_argument, &show_version, 1},
  85         {"no-detach", no_argument, &do_detach, 0},
  86         {"generate-keys", optional_argument, NULL, 'K'},
  87         {"debug", optional_argument, NULL, 'd'},
  88         {"bypass-security", no_argument, &bypass_security, 1},
  89         {"mlock", no_argument, &do_mlock, 1},
  90         {"logfile", optional_argument, NULL, 'F'},
  91         {NULL, 0, NULL, 0}
  92 };
  93
  94 static void usage(int status)
  95 {
  96         if(status != 0)
  97                 fprintf(stderr, _("Try `%s --help\' for more information.\n"),
  98                                 program_name);
  99         else {
 100                 printf(_("Usage: %s [option]...\n\n"), program_name);
 101                 printf(_("  -c, --config=DIR           Read configuration options from DIR.\n"
 102                                 "  -D, --no-detach            Don't fork and detach.\n"
 103                                 "  -d, --debug[=LEVEL]        Increase debug level or set it to LEVEL.\n"
 104                                 "  -k, --kill[=SIGNAL]        Attempt to kill a running tincd and exit.\n"
 105                                 "  -n, --net=NETNAME          Connect to net NETNAME.\n"
 106                                 "  -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
 107                                 "  -L, --mlock                Lock tinc into main memory.\n"
 108                                 "  -F, --logfile[=FILENAME]   Write log entries to a logfile.\n"
 109                                 "      --help                 Display this help and exit.\n"
 110                                 "      --version              Output version information and exit.\n\n"));
 111                 printf(_("Report bugs to tinc@nl.linux.org.\n"));
 112         }
 113
 114         exit(status);
 115 }
 116
 117 static void parse_options(int argc, char **argv, char **envp)
 118 {
 119         int r;
 120         int option_index = 0;
 121
 122         while((r = getopt_long(argc, argv, "c:DLd::k::n:K::F::", long_options, &option_index)) != EOF) {
 123                 switch (r) {
 124                         case 0:                         /* long option */
 125                                 break;
 126
 127                         case 'c':                               /* config file */
 128                                 confbase = xmalloc(strlen(optarg) + 1);
 129                                 strcpy(confbase, optarg);
 130                                 break;
 131
 132                         case 'D':                               /* no detach */
 133                                 do_detach = 0;
 134                                 break;
 135
 136                         case 'L':                               /* no detach */
 137                                 do_mlock = 1;
 138                                 break;
 139
 140                         case 'd':                               /* inc debug level */
 141                                 if(optarg)
 142                                         debug_level = atoi(optarg);
 143                                 else
 144                                         debug_level++;
 145                                 break;
 146
 147                         case 'k':                               /* kill old tincds */
 148                                 if(optarg) {
 149                                         if(!strcasecmp(optarg, "HUP"))
 150                                                 kill_tincd = SIGHUP;
 151                                         else if(!strcasecmp(optarg, "TERM"))
 152                                                 kill_tincd = SIGTERM;
 153                                         else if(!strcasecmp(optarg, "KILL"))
 154                                                 kill_tincd = SIGKILL;
 155                                         else if(!strcasecmp(optarg, "USR1"))
 156                                                 kill_tincd = SIGUSR1;
 157                                         else if(!strcasecmp(optarg, "USR2"))
 158                                                 kill_tincd = SIGUSR2;
 159                                         else if(!strcasecmp(optarg, "WINCH"))
 160                                                 kill_tincd = SIGWINCH;
 161                                         else if(!strcasecmp(optarg, "INT"))
 162                                                 kill_tincd = SIGINT;
 163                                         else if(!strcasecmp(optarg, "ALRM"))
 164                                                 kill_tincd = SIGALRM;
 165                                         else {
 166                                                 kill_tincd = atoi(optarg);
 167
 168                                                 if(!kill_tincd) {
 169                                                         fprintf(stderr, _("Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n"),
 170                                                                         optarg);
 171                                                         usage(1);
 172                                                 }
 173                                         }
 174                                 } else
 175                                         kill_tincd = SIGTERM;
 176                                 break;
 177
 178                         case 'n':                               /* net name given */
 179                                 netname = xstrdup(optarg);
 180                                 break;
 181
 182                         case 'K':                               /* generate public/private keypair */
 183                                 if(optarg) {
 184                                         generate_keys = atoi(optarg);
 185
 186                                         if(generate_keys < 512) {
 187                                                 fprintf(stderr, _("Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n"),
 188                                                                 optarg);
 189                                                 usage(1);
 190                                         }
 191
 192                                         generate_keys &= ~7;    /* Round it to bytes */
 193                                 } else
 194                                         generate_keys = 1024;
 195                                 break;
 196
 197                         case 'F':                               /* write log entries to a file */
 198                                 use_logfile = 1;
 199                                 if(optarg)
 200                                         logfilename = xstrdup(optarg);
 201                                 break;
 202
 203                         case '?':
 204                                 usage(1);
 205
 206                         default:
 207                                 break;
 208                 }
 209         }
 210 }
 211
 212 /* This function prettyprints the key generation process */
 213
 214 static void indicator(int a, int b, void *p)
 215 {
 216         switch (a) {
 217                 case 0:
 218                         fprintf(stderr, ".");
 219                         break;
 220
 221                 case 1:
 222                         fprintf(stderr, "+");
 223                         break;
 224
 225                 case 2:
 226                         fprintf(stderr, "-");
 227                         break;
 228
 229                 case 3:
 230                         switch (b) {
 231                                 case 0:
 232                                         fprintf(stderr, " p\n");
 233                                         break;
 234
 235                                 case 1:
 236                                         fprintf(stderr, " q\n");
 237                                         break;
 238
 239                                 default:
 240                                         fprintf(stderr, "?");
 241                         }
 242                         break;
 243
 244                 default:
 245                         fprintf(stderr, "?");
 246         }
 247 }
 248
 249 /*
 250   Generate a public/private RSA keypair, and ask for a file to store
 251   them in.
 252 */
 253 static int keygen(int bits)
 254 {
 255         RSA *rsa_key;
 256         FILE *f;
 257         char *name = NULL;
 258         char *filename;
 259
 260         fprintf(stderr, _("Generating %d bits keys:\n"), bits);
 261         rsa_key = RSA_generate_key(bits, 0xFFFF, indicator, NULL);
 262
 263         if(!rsa_key) {
 264                 fprintf(stderr, _("Error during key generation!\n"));
 265                 return -1;
 266         } else
 267                 fprintf(stderr, _("Done.\n"));
 268
 269         get_config_string(lookup_config(config_tree, "Name"), &name);
 270
 271         if(name)
 272                 asprintf(&filename, "%s/hosts/%s", confbase, name);
 273         else
 274                 asprintf(&filename, "%s/rsa_key.pub", confbase);
 275
 276         f = ask_and_safe_open(filename, _("public RSA key"), "a");
 277
 278         if(!f)
 279                 return -1;
 280
 281         if(ftell(f))
 282                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 283
 284         PEM_write_RSAPublicKey(f, rsa_key);
 285         fclose(f);
 286         free(filename);
 287
 288         asprintf(&filename, "%s/rsa_key.priv", confbase);
 289         f = ask_and_safe_open(filename, _("private RSA key"), "a");
 290
 291         if(!f)
 292                 return -1;
 293
 294         if(ftell(f))
 295                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 296
 297         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 298         fclose(f);
 299         free(filename);
 300
 301         return 0;
 302 }
 303
 304 /*
 305   Set all files and paths according to netname
 306 */
 307 static void make_names(void)
 308 {
 309         if(netname) {
 310                 if(!pidfilename)
 311                         asprintf(&pidfilename, LOCALSTATEDIR "/run/tinc.%s.pid", netname);
 312                 if(!logfilename)
 313                         asprintf(&logfilename, LOCALSTATEDIR "/log/tinc.%s.log", netname);
 314
 315                 if(!confbase)
 316                         asprintf(&confbase, "%s/tinc/%s", CONFDIR, netname);
 317                 else
 318                         logger(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
 319
 320                 if(!identname)
 321                         asprintf(&identname, "tinc.%s", netname);
 322         } else {
 323                 if(!pidfilename)
 324                         pidfilename = LOCALSTATEDIR "/run/tinc.pid";
 325                 if(!logfilename)
 326                         logfilename = LOCALSTATEDIR "/log/tinc.log";
 327
 328                 if(!confbase)
 329                         asprintf(&confbase, "%s/tinc", CONFDIR);
 330
 331                 if(!identname)
 332                         identname = "tinc";
 333         }
 334 }
 335
 336 int main(int argc, char **argv, char **envp)
 337 {
 338         program_name = argv[0];
 339
 340         setlocale(LC_ALL, "");
 341         bindtextdomain(PACKAGE, LOCALEDIR);
 342         textdomain(PACKAGE);
 343
 344         environment = envp;
 345         parse_options(argc, argv, envp);
 346         make_names();
 347
 348         if(show_version) {
 349                 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
 350                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 351                 printf(_("Copyright (C) 1998-2003 Ivo Timmermans, Guus Sliepen and others.\n"
 352                                 "See the AUTHORS file for a complete list.\n\n"
 353                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 354                                 "and you are welcome to redistribute it under certain conditions;\n"
 355                                 "see the file COPYING for details.\n"));
 356
 357                 return 0;
 358         }
 359
 360         if(show_help)
 361                 usage(0);
 362
 363         if(kill_tincd)
 364                 exit(kill_other(kill_tincd));
 365
 366         openlogger("tinc", LOGMODE_STDERR);
 367
 368         /* Lock all pages into memory if requested */
 369
 370         if(do_mlock)
 371 #ifdef HAVE_MLOCKALL
 372                 if(mlockall(MCL_CURRENT | MCL_FUTURE)) {
 373                         logger(LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
 374                                    strerror(errno));
 375 #else
 376         {
 377                 logger(LOG_ERR, _("mlockall() not supported on this platform!"));
 378 #endif
 379                 return -1;
 380         }
 381
 382         g_argv = argv;
 383
 384         init_configuration(&config_tree);
 385
 386         /* Slllluuuuuuurrrrp! */
 387
 388         RAND_load_file("/dev/urandom", 1024);
 389
 390         OpenSSL_add_all_algorithms();
 391
 392         if(generate_keys) {
 393                 read_server_config();
 394                 exit(keygen(generate_keys));
 395         }
 396
 397         if(read_server_config())
 398                 exit(1);
 399
 400         if(lzo_init() != LZO_E_OK) {
 401                 logger(LOG_ERR, _("Error initializing LZO compressor!"));
 402                 exit(1);
 403         }
 404
 405         if(detach())
 406                 exit(0);
 407
 408         for(;;) {
 409                 if(!setup_network_connections()) {
 410                         main_loop();
 411                         cleanup_and_exit(1);
 412                 }
 413
 414                 logger(LOG_ERR, _("Unrecoverable error"));
 415                 cp_trace();
 416
 417                 if(do_detach) {
 418                         logger(LOG_NOTICE, _("Restarting in %d seconds!"), maxtimeout);
 419                         sleep(maxtimeout);
 420                 } else {
 421                         logger(LOG_ERR, _("Not restarting."));
 422                         exit(1);
 423                 }
 424         }
 425 }