git.meshlink.io Git - meshlink/blob - src/tincd.c

   1 /*
   2     tincd.c -- the main file for tincd
   3     Copyright (C) 1998-2005 Ivo Timmermans
   4                   2000-2009 Guus Sliepen <guus@tinc-vpn.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     $Id$
  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 LZO1X_H
  35
  36 #ifndef HAVE_MINGW
  37 #include <pwd.h>
  38 #include <grp.h>
  39 #include <time.h>
  40 #endif
  41
  42 #include <getopt.h>
  43
  44 #include "conf.h"
  45 #include "control.h"
  46 #include "crypto.h"
  47 #include "device.h"
  48 #include "logger.h"
  49 #include "net.h"
  50 #include "netutl.h"
  51 #include "process.h"
  52 #include "protocol.h"
  53 #include "utils.h"
  54 #include "xalloc.h"
  55
  56 /* The name this program was run with. */
  57 char *program_name = NULL;
  58
  59 /* If nonzero, display usage information and exit. */
  60 bool show_help = false;
  61
  62 /* If nonzero, print the version on standard output and exit.  */
  63 bool show_version = false;
  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, chroot to netdir after startup. */
  72 static bool do_chroot = false;
  73
  74 /* If !NULL, do setuid to given user after startup */
  75 static const char *switchuser = NULL;
  76
  77 /* If nonzero, write log entries to a separate file. */
  78 bool use_logfile = false;
  79
  80 char *identname = NULL;                         /* program name for syslog */
  81 char *controlsocketname = NULL;                 /* control socket location */
  82 char *logfilename = NULL;                       /* log file location */
  83 char **g_argv;                                  /* a copy of the cmdline arguments */
  84
  85 static int status;
  86
  87 static struct option const long_options[] = {
  88         {"config", required_argument, NULL, 'c'},
  89         {"net", required_argument, NULL, 'n'},
  90         {"help", no_argument, NULL, 1},
  91         {"version", no_argument, NULL, 2},
  92         {"no-detach", no_argument, NULL, 'D'},
  93         {"debug", optional_argument, NULL, 'd'},
  94         {"bypass-security", no_argument, NULL, 3},
  95         {"mlock", no_argument, NULL, 'L'},
  96         {"chroot", no_argument, NULL, 'R'},
  97         {"user", required_argument, NULL, 'U'},
  98         {"logfile", optional_argument, NULL, 4},
  99         {"controlsocket", required_argument, NULL, 5},
 100         {NULL, 0, NULL, 0}
 101 };
 102
 103 #ifdef HAVE_MINGW
 104 static struct WSAData wsa_state;
 105 CRITICAL_SECTION mutex;
 106 #endif
 107
 108 static void usage(bool status)
 109 {
 110         if(status)
 111                 fprintf(stderr, _("Try `%s --help\' for more information.\n"),
 112                                 program_name);
 113         else {
 114                 printf(_("Usage: %s [option]...\n\n"), program_name);
 115                 printf(_(       "  -c, --config=DIR              Read configuration options from DIR.\n"
 116                                 "  -D, --no-detach               Don't fork and detach.\n"
 117                                 "  -d, --debug[=LEVEL]           Increase debug level or set it to LEVEL.\n"
 118                                 "  -n, --net=NETNAME             Connect to net NETNAME.\n"
 119                                 "  -L, --mlock                   Lock tinc into main memory.\n"
 120                                 "      --logfile[=FILENAME]      Write log entries to a logfile.\n"
 121                                 "      --controlsocket=FILENAME  Open control socket at FILENAME.\n"
 122                                 "      --bypass-security         Disables meta protocol security, for debugging.\n"
 123                                 "  -R, --chroot                  chroot to NET dir at startup.\n"
 124                                 "  -U, --user=USER               setuid to given USER at startup.\n"                            "      --help                    Display this help and exit.\n"
 125                                 "      --version                 Output version information and exit.\n\n"));
 126                 printf(_("Report bugs to tinc@tinc-vpn.org.\n"));
 127         }
 128 }
 129
 130 static bool parse_options(int argc, char **argv)
 131 {
 132         int r;
 133         int option_index = 0;
 134
 135         while((r = getopt_long(argc, argv, "c:DLd::n:RU:", long_options, &option_index)) != EOF) {
 136                 switch (r) {
 137                         case 0:                         /* long option */
 138                                 break;
 139
 140                         case 'c':                               /* config file */
 141                                 confbase = xstrdup(optarg);
 142                                 break;
 143
 144                         case 'D':                               /* no detach */
 145                                 do_detach = false;
 146                                 break;
 147
 148                         case 'L':                               /* no detach */
 149 #ifndef HAVE_MLOCKALL
 150                                 logger(LOG_ERR, _("%s not supported on this platform"), "mlockall()");
 151                                 return false;
 152 #else
 153                                 do_mlock = true;
 154                                 break;
 155 #endif
 156
 157                         case 'd':                               /* inc debug level */
 158                                 if(optarg)
 159                                         debug_level = atoi(optarg);
 160                                 else
 161                                         debug_level++;
 162                                 break;
 163
 164                         case 'n':                               /* net name given */
 165                                 netname = xstrdup(optarg);
 166                                 break;
 167
 168                         case 'R':                               /* chroot to NETNAME dir */
 169                                 do_chroot = true;
 170                                 break;
 171
 172                         case 'U':                               /* setuid to USER */
 173                                 switchuser = optarg;
 174                                 break;
 175
 176                         case 1:                                 /* show help */
 177                                 show_help = true;
 178                                 break;
 179
 180                         case 2:                                 /* show version */
 181                                 show_version = true;
 182                                 break;
 183
 184                         case 3:                                 /* bypass security */
 185                                 bypass_security = true;
 186                                 break;
 187
 188                         case 4:                                 /* write log entries to a file */
 189                                 use_logfile = true;
 190                                 if(optarg)
 191                                         logfilename = xstrdup(optarg);
 192                                 break;
 193
 194                         case 5:                                 /* open control socket here */
 195                                 controlsocketname = xstrdup(optarg);
 196                                 break;
 197
 198                         case '?':
 199                                 usage(true);
 200                                 return false;
 201
 202                         default:
 203                                 break;
 204                 }
 205         }
 206
 207         return true;
 208 }
 209
 210 /*
 211   Set all files and paths according to netname
 212 */
 213 static void make_names(void)
 214 {
 215 #ifdef HAVE_MINGW
 216         HKEY key;
 217         char installdir[1024] = "";
 218         long len = sizeof installdir;
 219 #endif
 220
 221         if(netname)
 222                 xasprintf(&identname, "tinc.%s", netname);
 223         else
 224                 identname = xstrdup("tinc");
 225
 226 #ifdef HAVE_MINGW
 227         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 228                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 229                         if(!logfilename)
 230                                 xasprintf(&logfilename, "%s/log/%s.log", identname);
 231                         if(!confbase) {
 232                                 if(netname)
 233                                         xasprintf(&confbase, "%s/%s", installdir, netname);
 234                                 else
 235                                         xasprintf(&confbase, "%s", installdir);
 236                         }
 237                 }
 238                 RegCloseKey(key);
 239                 if(*installdir)
 240                         return;
 241         }
 242 #endif
 243
 244         if(!controlsocketname)
 245                 xasprintf(&controlsocketname, "%s/run/%s.control/socket", LOCALSTATEDIR, identname);
 246
 247         if(!logfilename)
 248                 xasprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 249
 250         if(netname) {
 251                 if(!confbase)
 252                         xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
 253                 else
 254                         logger(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
 255         } else {
 256                 if(!confbase)
 257                         xasprintf(&confbase, CONFDIR "/tinc");
 258         }
 259 }
 260
 261 static void free_names() {
 262         if (identname) free(identname);
 263         if (netname) free(netname);
 264         if (controlsocketname) free(controlsocketname);
 265         if (logfilename) free(logfilename);
 266         if (confbase) free(confbase);
 267 }
 268
 269 static bool drop_privs() {
 270 #ifdef HAVE_MINGW
 271         if (switchuser) {
 272                 logger(LOG_ERR, _("%s not supported on this platform"), "-U");
 273                 return false;
 274         }
 275         if (do_chroot) {
 276                 logger(LOG_ERR, _("%s not supported on this platform"), "-R");
 277                 return false;
 278         }
 279 #else
 280         uid_t uid = 0;
 281         if (switchuser) {
 282                 struct passwd *pw = getpwnam(switchuser);
 283                 if (!pw) {
 284                         logger(LOG_ERR, _("unknown user `%s'"), switchuser);
 285                         return false;
 286                 }
 287                 uid = pw->pw_uid;
 288                 if (initgroups(switchuser, pw->pw_gid) != 0 ||
 289                     setgid(pw->pw_gid) != 0) {
 290                         logger(LOG_ERR, _("System call `%s' failed: %s"),
 291                                "initgroups", strerror(errno));
 292                         return false;
 293                 }
 294                 endgrent();
 295                 endpwent();
 296         }
 297         if (do_chroot) {
 298                 tzset();        /* for proper timestamps in logs */
 299                 if (chroot(confbase) != 0 || chdir("/") != 0) {
 300                         logger(LOG_ERR, _("System call `%s' failed: %s"),
 301                                "chroot", strerror(errno));
 302                         return false;
 303                 }
 304                 free(confbase);
 305                 confbase = xstrdup("");
 306         }
 307         if (switchuser)
 308                 if (setuid(uid) != 0) {
 309                         logger(LOG_ERR, _("System call `%s' failed: %s"),
 310                                "setuid", strerror(errno));
 311                         return false;
 312                 }
 313 #endif
 314         return true;
 315 }
 316
 317 #ifdef HAVE_MINGW
 318 # define setpriority(level) SetPriorityClass(GetCurrentProcess(), level)
 319 #else
 320 # define NORMAL_PRIORITY_CLASS 0
 321 # define BELOW_NORMAL_PRIORITY_CLASS 10
 322 # define HIGH_PRIORITY_CLASS -10
 323 # define setpriority(level) nice(level)
 324 #endif
 325
 326 int main(int argc, char **argv)
 327 {
 328         program_name = argv[0];
 329
 330         setlocale(LC_ALL, "");
 331         bindtextdomain(PACKAGE, LOCALEDIR);
 332         textdomain(PACKAGE);
 333
 334         if(!parse_options(argc, argv))
 335                 return 1;
 336
 337         make_names();
 338
 339         if(show_version) {
 340                 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
 341                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 342                 printf(_("Copyright (C) 1998-2009 Ivo Timmermans, Guus Sliepen and others.\n"
 343                                 "See the AUTHORS file for a complete list.\n\n"
 344                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 345                                 "and you are welcome to redistribute it under certain conditions;\n"
 346                                 "see the file COPYING for details.\n"));
 347
 348                 return 0;
 349         }
 350
 351         if(show_help) {
 352                 usage(false);
 353                 return 0;
 354         }
 355
 356         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 357
 358         if(!event_init()) {
 359                 logger(LOG_ERR, _("Error initializing libevent!"));
 360                 return 1;
 361         }
 362
 363         if(!init_control())
 364                 return 1;
 365
 366         g_argv = argv;
 367
 368         init_configuration(&config_tree);
 369
 370         /* Slllluuuuuuurrrrp! */
 371
 372         srand(time(NULL));
 373         crypto_init();
 374
 375         if(!read_server_config())
 376                 return 1;
 377
 378         if(lzo_init() != LZO_E_OK) {
 379                 logger(LOG_ERR, _("Error initializing LZO compressor!"));
 380                 return 1;
 381         }
 382
 383 #ifdef HAVE_MINGW
 384         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 385                 logger(LOG_ERR, _("System call `%s' failed: %s"), "WSAStartup", winerror(GetLastError()));
 386                 return 1;
 387         }
 388
 389         if(!do_detach || !init_service())
 390                 return main2(argc, argv);
 391         else
 392                 return 1;
 393 }
 394
 395 int main2(int argc, char **argv)
 396 {
 397         InitializeCriticalSection(&mutex);
 398         EnterCriticalSection(&mutex);
 399 #endif
 400
 401         if(!detach())
 402                 return 1;
 403
 404 #ifdef HAVE_MLOCKALL
 405         /* Lock all pages into memory if requested.
 406          * This has to be done after daemon()/fork() so it works for child.
 407          * No need to do that in parent as it's very short-lived. */
 408         if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
 409                 logger(LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
 410                    strerror(errno));
 411                 return 1;
 412         }
 413 #endif
 414
 415         /* Setup sockets and open device. */
 416
 417         if(!setup_network())
 418                 goto end;
 419
 420         /* Initiate all outgoing connections. */
 421
 422         try_outgoing_connections();
 423
 424         /* Change process priority */
 425
 426         char *priority = 0;
 427
 428         if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
 429                 if(!strcasecmp(priority, "Normal"))
 430                         setpriority(NORMAL_PRIORITY_CLASS);
 431                 else if(!strcasecmp(priority, "Low"))
 432                         setpriority(BELOW_NORMAL_PRIORITY_CLASS);
 433                 else if(!strcasecmp(priority, "High"))
 434                         setpriority(HIGH_PRIORITY_CLASS);
 435                 else {
 436                         logger(LOG_ERR, _("Invalid priority `%s`!"), priority);
 437                         goto end;
 438                 }
 439         }
 440
 441         /* drop privileges */
 442         if (!drop_privs())
 443                 goto end;
 444
 445         /* Start main loop. It only exits when tinc is killed. */
 446
 447         status = main_loop();
 448
 449         /* Shutdown properly. */
 450
 451         ifdebug(CONNECTIONS)
 452                 dump_device_stats();
 453
 454         close_network_connections();
 455
 456 end:
 457         logger(LOG_NOTICE, _("Terminating"));
 458
 459 #ifndef HAVE_MINGW
 460         exit_control();
 461 #endif
 462
 463         crypto_exit();
 464
 465         exit_configuration(&config_tree);
 466         free_names();
 467
 468         return status;
 469 }