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 1.10.4.74 2003/07/21 13:18:44 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 int show_help = 0;
  55
  56 /* If nonzero, print the version on standard output and exit.  */
  57 int show_version = 0;
  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 int bypass_security = 0;
  67
  68 /* If nonzero, disable swapping for this process. */
  69 int do_mlock = 0;
  70
  71 /* If nonzero, write log entries to a separate file. */
  72 int use_logfile = 0;
  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
  79                                                                    startup */
  80
  81 static struct option const long_options[] = {
  82         {"config", required_argument, NULL, 'c'},
  83         {"kill", optional_argument, NULL, 'k'},
  84         {"net", required_argument, NULL, 'n'},
  85         {"help", no_argument, &show_help, 1},
  86         {"version", no_argument, &show_version, 1},
  87         {"no-detach", no_argument, &do_detach, 0},
  88         {"generate-keys", optional_argument, NULL, 'K'},
  89         {"debug", optional_argument, NULL, 'd'},
  90         {"bypass-security", no_argument, &bypass_security, 1},
  91         {"mlock", no_argument, &do_mlock, 1},
  92         {"logfile", optional_argument, NULL, 'F'},
  93         {NULL, 0, NULL, 0}
  94 };
  95
  96 static void usage(int status)
  97 {
  98         if(status != 0)
  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                                 "  -F, --logfile[=FILENAME]   Write log entries to a logfile.\n"
 111                                 "      --help                 Display this help and exit.\n"
 112                                 "      --version              Output version information and exit.\n\n"));
 113                 printf(_("Report bugs to tinc@nl.linux.org.\n"));
 114         }
 115
 116         exit(status);
 117 }
 118
 119 static void parse_options(int argc, char **argv, char **envp)
 120 {
 121         int r;
 122         int option_index = 0;
 123
 124         while((r = getopt_long(argc, argv, "c:DLd::k::n:K::F::", long_options, &option_index)) != EOF) {
 125                 switch (r) {
 126                         case 0:                         /* long option */
 127                                 break;
 128
 129                         case 'c':                               /* config file */
 130                                 confbase = xmalloc(strlen(optarg) + 1);
 131                                 strcpy(confbase, optarg);
 132                                 break;
 133
 134                         case 'D':                               /* no detach */
 135                                 do_detach = 0;
 136                                 break;
 137
 138                         case 'L':                               /* no detach */
 139                                 do_mlock = 1;
 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                                 if(optarg) {
 151                                         if(!strcasecmp(optarg, "HUP"))
 152                                                 kill_tincd = SIGHUP;
 153                                         else if(!strcasecmp(optarg, "TERM"))
 154                                                 kill_tincd = SIGTERM;
 155                                         else if(!strcasecmp(optarg, "KILL"))
 156                                                 kill_tincd = SIGKILL;
 157                                         else if(!strcasecmp(optarg, "USR1"))
 158                                                 kill_tincd = SIGUSR1;
 159                                         else if(!strcasecmp(optarg, "USR2"))
 160                                                 kill_tincd = SIGUSR2;
 161                                         else if(!strcasecmp(optarg, "WINCH"))
 162                                                 kill_tincd = SIGWINCH;
 163                                         else if(!strcasecmp(optarg, "INT"))
 164                                                 kill_tincd = SIGINT;
 165                                         else if(!strcasecmp(optarg, "ALRM"))
 166                                                 kill_tincd = SIGALRM;
 167                                         else {
 168                                                 kill_tincd = atoi(optarg);
 169
 170                                                 if(!kill_tincd) {
 171                                                         fprintf(stderr, _("Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n"),
 172                                                                         optarg);
 173                                                         usage(1);
 174                                                 }
 175                                         }
 176                                 } else
 177                                         kill_tincd = SIGTERM;
 178                                 break;
 179
 180                         case 'n':                               /* net name given */
 181                                 netname = xstrdup(optarg);
 182                                 break;
 183
 184                         case 'K':                               /* generate public/private keypair */
 185                                 if(optarg) {
 186                                         generate_keys = atoi(optarg);
 187
 188                                         if(generate_keys < 512) {
 189                                                 fprintf(stderr, _("Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n"),
 190                                                                 optarg);
 191                                                 usage(1);
 192                                         }
 193
 194                                         generate_keys &= ~7;    /* Round it to bytes */
 195                                 } else
 196                                         generate_keys = 1024;
 197                                 break;
 198
 199                         case 'F':                               /* write log entries to a file */
 200                                 use_logfile = 1;
 201                                 if(optarg)
 202                                         logfilename = xstrdup(optarg);
 203                                 break;
 204
 205                         case '?':
 206                                 usage(1);
 207
 208                         default:
 209                                 break;
 210                 }
 211         }
 212 }
 213
 214 /* This function prettyprints the key generation process */
 215
 216 static void indicator(int a, int b, void *p)
 217 {
 218         switch (a) {
 219                 case 0:
 220                         fprintf(stderr, ".");
 221                         break;
 222
 223                 case 1:
 224                         fprintf(stderr, "+");
 225                         break;
 226
 227                 case 2:
 228                         fprintf(stderr, "-");
 229                         break;
 230
 231                 case 3:
 232                         switch (b) {
 233                                 case 0:
 234                                         fprintf(stderr, " p\n");
 235                                         break;
 236
 237                                 case 1:
 238                                         fprintf(stderr, " q\n");
 239                                         break;
 240
 241                                 default:
 242                                         fprintf(stderr, "?");
 243                         }
 244                         break;
 245
 246                 default:
 247                         fprintf(stderr, "?");
 248         }
 249 }
 250
 251 /*
 252   Generate a public/private RSA keypair, and ask for a file to store
 253   them in.
 254 */
 255 static int keygen(int bits)
 256 {
 257         RSA *rsa_key;
 258         FILE *f;
 259         char *name = NULL;
 260         char *filename;
 261
 262         fprintf(stderr, _("Generating %d bits keys:\n"), bits);
 263         rsa_key = RSA_generate_key(bits, 0xFFFF, indicator, NULL);
 264
 265         if(!rsa_key) {
 266                 fprintf(stderr, _("Error during key generation!\n"));
 267                 return -1;
 268         } else
 269                 fprintf(stderr, _("Done.\n"));
 270
 271         get_config_string(lookup_config(config_tree, "Name"), &name);
 272
 273         if(name)
 274                 asprintf(&filename, "%s/hosts/%s", confbase, name);
 275         else
 276                 asprintf(&filename, "%s/rsa_key.pub", confbase);
 277
 278         f = ask_and_safe_open(filename, _("public RSA key"), "a");
 279
 280         if(!f)
 281                 return -1;
 282
 283         if(ftell(f))
 284                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 285
 286         PEM_write_RSAPublicKey(f, rsa_key);
 287         fclose(f);
 288         free(filename);
 289
 290         asprintf(&filename, "%s/rsa_key.priv", confbase);
 291         f = ask_and_safe_open(filename, _("private RSA key"), "a");
 292
 293         if(!f)
 294                 return -1;
 295
 296         if(ftell(f))
 297                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 298
 299         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 300         fclose(f);
 301         free(filename);
 302
 303         return 0;
 304 }
 305
 306 /*
 307   Set all files and paths according to netname
 308 */
 309 static void make_names(void)
 310 {
 311         if(netname) {
 312                 if(!pidfilename)
 313                         asprintf(&pidfilename, LOCALSTATEDIR "/run/tinc.%s.pid", netname);
 314                 if(!logfilename)
 315                         asprintf(&logfilename, LOCALSTATEDIR "/log/tinc.%s.log", netname);
 316
 317                 if(!confbase)
 318                         asprintf(&confbase, "%s/tinc/%s", CONFDIR, netname);
 319                 else
 320                         logger(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
 321
 322                 if(!identname)
 323                         asprintf(&identname, "tinc.%s", netname);
 324         } else {
 325                 if(!pidfilename)
 326                         pidfilename = LOCALSTATEDIR "/run/tinc.pid";
 327                 if(!logfilename)
 328                         logfilename = LOCALSTATEDIR "/log/tinc.log";
 329
 330                 if(!confbase)
 331                         asprintf(&confbase, "%s/tinc", CONFDIR);
 332
 333                 if(!identname)
 334                         identname = "tinc";
 335         }
 336 }
 337
 338 int main(int argc, char **argv, char **envp)
 339 {
 340         program_name = argv[0];
 341
 342         setlocale(LC_ALL, "");
 343         bindtextdomain(PACKAGE, LOCALEDIR);
 344         textdomain(PACKAGE);
 345
 346         environment = envp;
 347         parse_options(argc, argv, envp);
 348         make_names();
 349
 350         if(show_version) {
 351                 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
 352                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 353                 printf(_("Copyright (C) 1998-2003 Ivo Timmermans, Guus Sliepen and others.\n"
 354                                 "See the AUTHORS file for a complete list.\n\n"
 355                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 356                                 "and you are welcome to redistribute it under certain conditions;\n"
 357                                 "see the file COPYING for details.\n"));
 358
 359                 return 0;
 360         }
 361
 362         if(show_help)
 363                 usage(0);
 364
 365         if(kill_tincd)
 366                 exit(kill_other(kill_tincd));
 367
 368         openlogger("tinc", LOGMODE_STDERR);
 369
 370         /* Lock all pages into memory if requested */
 371
 372         if(do_mlock)
 373 #ifdef HAVE_MLOCKALL
 374                 if(mlockall(MCL_CURRENT | MCL_FUTURE)) {
 375                         logger(LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
 376                                    strerror(errno));
 377 #else
 378         {
 379                 logger(LOG_ERR, _("mlockall() not supported on this platform!"));
 380 #endif
 381                 return -1;
 382         }
 383
 384         g_argv = argv;
 385
 386         init_configuration(&config_tree);
 387
 388         /* Slllluuuuuuurrrrp! */
 389
 390         RAND_load_file("/dev/urandom", 1024);
 391
 392         OpenSSL_add_all_algorithms();
 393
 394         if(generate_keys) {
 395                 read_server_config();
 396                 exit(keygen(generate_keys));
 397         }
 398
 399         if(read_server_config())
 400                 exit(1);
 401
 402         if(lzo_init() != LZO_E_OK) {
 403                 logger(LOG_ERR, _("Error initializing LZO compressor!"));
 404                 exit(1);
 405         }
 406
 407         if(detach())
 408                 exit(0);
 409
 410         for(;;) {
 411                 if(!setup_network_connections()) {
 412                         main_loop();
 413                         cleanup_and_exit(1);
 414                 }
 415
 416                 logger(LOG_ERR, _("Unrecoverable error"));
 417                 cp_trace();
 418
 419                 if(do_detach) {
 420                         logger(LOG_NOTICE, _("Restarting in %d seconds!"), maxtimeout);
 421                         sleep(maxtimeout);
 422                 } else {
 423                         logger(LOG_ERR, _("Not restarting."));
 424                         exit(1);
 425                 }
 426         }
 427 }