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 1.10.4.75 2003/07/22 12:58:34 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         {"pidfile", required_argument, NULL, 'P'},
  94         {NULL, 0, NULL, 0}
  95 };
  96
  97 static void usage(int status)
  98 {
  99         if(status != 0)
 100                 fprintf(stderr, _("Try `%s --help\' for more information.\n"),
 101                                 program_name);
 102         else {
 103                 printf(_("Usage: %s [option]...\n\n"), program_name);
 104                 printf(_("  -c, --config=DIR           Read configuration options from DIR.\n"
 105                                 "  -D, --no-detach            Don't fork and detach.\n"
 106                                 "  -d, --debug[=LEVEL]        Increase debug level or set it to LEVEL.\n"
 107                                 "  -k, --kill[=SIGNAL]        Attempt to kill a running tincd and exit.\n"
 108                                 "  -n, --net=NETNAME          Connect to net NETNAME.\n"
 109                                 "  -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
 110                                 "  -L, --mlock                Lock tinc into main memory.\n"
 111                                 "      --logfile[=FILENAME]   Write log entries to a logfile.\n"
 112                                 "      --pidfile=FILENAME     Write PID to FILENAME.\n"
 113                                 "      --help                 Display this help and exit.\n"
 114                                 "      --version              Output version information and exit.\n\n"));
 115                 printf(_("Report bugs to tinc@nl.linux.org.\n"));
 116         }
 117
 118         exit(status);
 119 }
 120
 121 static void parse_options(int argc, char **argv, char **envp)
 122 {
 123         int r;
 124         int option_index = 0;
 125
 126         while((r = getopt_long(argc, argv, "c:DLd::k::n:K::", long_options, &option_index)) != EOF) {
 127                 switch (r) {
 128                         case 0:                         /* long option */
 129                                 break;
 130
 131                         case 'c':                               /* config file */
 132                                 confbase = xstrdup(optarg);
 133                                 break;
 134
 135                         case 'D':                               /* no detach */
 136                                 do_detach = 0;
 137                                 break;
 138
 139                         case 'L':                               /* no detach */
 140                                 do_mlock = 1;
 141                                 break;
 142
 143                         case 'd':                               /* inc debug level */
 144                                 if(optarg)
 145                                         debug_level = atoi(optarg);
 146                                 else
 147                                         debug_level++;
 148                                 break;
 149
 150                         case 'k':                               /* kill old tincds */
 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(1);
 175                                                 }
 176                                         }
 177                                 } else
 178                                         kill_tincd = SIGTERM;
 179                                 break;
 180
 181                         case 'n':                               /* net name given */
 182                                 netname = xstrdup(optarg);
 183                                 break;
 184
 185                         case 'K':                               /* generate public/private keypair */
 186                                 if(optarg) {
 187                                         generate_keys = atoi(optarg);
 188
 189                                         if(generate_keys < 512) {
 190                                                 fprintf(stderr, _("Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n"),
 191                                                                 optarg);
 192                                                 usage(1);
 193                                         }
 194
 195                                         generate_keys &= ~7;    /* Round it to bytes */
 196                                 } else
 197                                         generate_keys = 1024;
 198                                 break;
 199
 200                         case 'F':                               /* write log entries to a file */
 201                                 use_logfile = 1;
 202                                 if(optarg)
 203                                         logfilename = xstrdup(optarg);
 204                                 break;
 205
 206                         case 'P':                               /* write PID to a file */
 207                                 pidfilename = xstrdup(optarg);
 208                                 break;
 209
 210                         case '?':
 211                                 usage(1);
 212
 213                         default:
 214                                 break;
 215                 }
 216         }
 217 }
 218
 219 /* This function prettyprints the key generation process */
 220
 221 static void indicator(int a, int b, void *p)
 222 {
 223         switch (a) {
 224                 case 0:
 225                         fprintf(stderr, ".");
 226                         break;
 227
 228                 case 1:
 229                         fprintf(stderr, "+");
 230                         break;
 231
 232                 case 2:
 233                         fprintf(stderr, "-");
 234                         break;
 235
 236                 case 3:
 237                         switch (b) {
 238                                 case 0:
 239                                         fprintf(stderr, " p\n");
 240                                         break;
 241
 242                                 case 1:
 243                                         fprintf(stderr, " q\n");
 244                                         break;
 245
 246                                 default:
 247                                         fprintf(stderr, "?");
 248                         }
 249                         break;
 250
 251                 default:
 252                         fprintf(stderr, "?");
 253         }
 254 }
 255
 256 /*
 257   Generate a public/private RSA keypair, and ask for a file to store
 258   them in.
 259 */
 260 static int keygen(int bits)
 261 {
 262         RSA *rsa_key;
 263         FILE *f;
 264         char *name = NULL;
 265         char *filename;
 266
 267         fprintf(stderr, _("Generating %d bits keys:\n"), bits);
 268         rsa_key = RSA_generate_key(bits, 0xFFFF, indicator, NULL);
 269
 270         if(!rsa_key) {
 271                 fprintf(stderr, _("Error during key generation!\n"));
 272                 return -1;
 273         } else
 274                 fprintf(stderr, _("Done.\n"));
 275
 276         get_config_string(lookup_config(config_tree, "Name"), &name);
 277
 278         if(name)
 279                 asprintf(&filename, "%s/hosts/%s", confbase, name);
 280         else
 281                 asprintf(&filename, "%s/rsa_key.pub", confbase);
 282
 283         f = ask_and_safe_open(filename, _("public RSA key"), "a");
 284
 285         if(!f)
 286                 return -1;
 287
 288         if(ftell(f))
 289                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 290
 291         PEM_write_RSAPublicKey(f, rsa_key);
 292         fclose(f);
 293         free(filename);
 294
 295         asprintf(&filename, "%s/rsa_key.priv", confbase);
 296         f = ask_and_safe_open(filename, _("private RSA key"), "a");
 297
 298         if(!f)
 299                 return -1;
 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         return 0;
 309 }
 310
 311 /*
 312   Set all files and paths according to netname
 313 */
 314 static void make_names(void)
 315 {
 316         if(netname)
 317                 asprintf(&identname, "tinc.%s", netname);
 318         else
 319                 identname = xstrdup("tinc");
 320
 321         if(!pidfilename)
 322                 asprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
 323
 324         if(!logfilename)
 325                 asprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 326
 327         if(netname) {
 328                 if(!confbase)
 329                         asprintf(&confbase, "%s/tinc/%s", CONFDIR, netname);
 330                 else
 331                         logger(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
 332         } else {
 333                 if(!confbase)
 334                         asprintf(&confbase, "%s/tinc", CONFDIR);
 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 }