www.tinc-vpn.org Git - tinc/blob - src/tincd.c

   1 /*
   2     tincd.c -- the main file for tincd
   3     Copyright (C) 1998-2005 Ivo Timmermans
   4                   2000-2014 Guus Sliepen <guus@tinc-vpn.org>
   5                   2008      Max Rijevski <maksuf@gmail.com>
   6                   2009      Michael Tokarev <mjt@tls.msk.ru>
   7                   2010      Julien Muchembled <jm@jmuchemb.eu>
   8                   2010      Timothy Redaelli <timothy@redaelli.eu>
   9
  10     This program is free software; you can redistribute it and/or modify
  11     it under the terms of the GNU General Public License as published by
  12     the Free Software Foundation; either version 2 of the License, or
  13     (at your option) any later version.
  14
  15     This program is distributed in the hope that it will be useful,
  16     but WITHOUT ANY WARRANTY; without even the implied warranty of
  17     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18     GNU General Public License for more details.
  19
  20     You should have received a copy of the GNU General Public License along
  21     with this program; if not, write to the Free Software Foundation, Inc.,
  22     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23 */
  24
  25 #include "system.h"
  26
  27 /* Darwin (MacOS/X) needs the following definition... */
  28 #ifndef _P1003_1B_VISIBLE
  29 #define _P1003_1B_VISIBLE
  30 #endif
  31
  32 #ifdef HAVE_SYS_MMAN_H
  33 #include <sys/mman.h>
  34 #endif
  35
  36 #ifdef HAVE_LZO
  37 #include LZO1X_H
  38 #endif
  39
  40 #ifndef HAVE_MINGW
  41 #include <pwd.h>
  42 #include <grp.h>
  43 #include <time.h>
  44 #endif
  45
  46 #include <getopt.h>
  47
  48 #include "conf.h"
  49 #include "control.h"
  50 #include "crypto.h"
  51 #include "device.h"
  52 #include "logger.h"
  53 #include "names.h"
  54 #include "net.h"
  55 #include "netutl.h"
  56 #include "process.h"
  57 #include "protocol.h"
  58 #include "utils.h"
  59 #include "xalloc.h"
  60
  61 /* If nonzero, display usage information and exit. */
  62 static bool show_help = false;
  63
  64 /* If nonzero, print the version on standard output and exit.  */
  65 static bool show_version = false;
  66
  67 /* If nonzero, use null ciphers and skip all key exchanges. */
  68 bool bypass_security = false;
  69
  70 #ifdef HAVE_MLOCKALL
  71 /* If nonzero, disable swapping for this process. */
  72 static bool do_mlock = false;
  73 #endif
  74
  75 #ifndef HAVE_MINGW
  76 /* If nonzero, chroot to netdir after startup. */
  77 static bool do_chroot = false;
  78
  79 /* If !NULL, do setuid to given user after startup */
  80 static const char *switchuser = NULL;
  81 #endif
  82
  83 /* If nonzero, write log entries to a separate file. */
  84 bool use_logfile = false;
  85
  86 /* If nonzero, use syslog instead of stderr in no-detach mode. */
  87 bool use_syslog = false;
  88
  89 char **g_argv;                  /* a copy of the cmdline arguments */
  90
  91 static int status = 1;
  92
  93 static struct option const long_options[] = {
  94         {"config", required_argument, NULL, 'c'},
  95         {"net", required_argument, NULL, 'n'},
  96         {"help", no_argument, NULL, 1},
  97         {"version", no_argument, NULL, 2},
  98         {"no-detach", no_argument, NULL, 'D'},
  99         {"debug", optional_argument, NULL, 'd'},
 100         {"bypass-security", no_argument, NULL, 3},
 101         {"mlock", no_argument, NULL, 'L'},
 102         {"chroot", no_argument, NULL, 'R'},
 103         {"user", required_argument, NULL, 'U'},
 104         {"logfile", optional_argument, NULL, 4},
 105         {"syslog", no_argument, NULL, 's'},
 106         {"pidfile", required_argument, NULL, 5},
 107         {"option", required_argument, NULL, 'o'},
 108         {NULL, 0, NULL, 0}
 109 };
 110
 111 #ifdef HAVE_MINGW
 112 static struct WSAData wsa_state;
 113 CRITICAL_SECTION mutex;
 114 int main2(int argc, char **argv);
 115 #endif
 116
 117 static void usage(bool status) {
 118         if(status)
 119                 fprintf(stderr, "Try `%s --help\' for more information.\n",
 120                                 program_name);
 121         else {
 122                 printf("Usage: %s [option]...\n\n", program_name);
 123                 printf( "  -c, --config=DIR              Read configuration options from DIR.\n"
 124                                 "  -D, --no-detach               Don't fork and detach.\n"
 125                                 "  -d, --debug[=LEVEL]           Increase debug level or set it to LEVEL.\n"
 126                                 "  -n, --net=NETNAME             Connect to net NETNAME.\n"
 127 #ifdef HAVE_MLOCKALL
 128                                 "  -L, --mlock                   Lock tinc into main memory.\n"
 129 #endif
 130                                 "      --logfile[=FILENAME]      Write log entries to a logfile.\n"
 131                                 "  -s  --syslog                  Use syslog instead of stderr with --no-detach.\n"
 132                                 "      --pidfile=FILENAME        Write PID and control socket cookie to FILENAME.\n"
 133                                 "      --bypass-security         Disables meta protocol security, for debugging.\n"
 134                                 "  -o, --option[HOST.]KEY=VALUE  Set global/host configuration value.\n"
 135 #ifndef HAVE_MINGW
 136                                 "  -R, --chroot                  chroot to NET dir at startup.\n"
 137                                 "  -U, --user=USER               setuid to given USER at startup.\n"
 138 #endif
 139                                 "      --help                    Display this help and exit.\n"
 140                                 "      --version                 Output version information and exit.\n\n");
 141                 printf("Report bugs to tinc@tinc-vpn.org.\n");
 142         }
 143 }
 144
 145 static bool parse_options(int argc, char **argv) {
 146         config_t *cfg;
 147         int r;
 148         int option_index = 0;
 149         int lineno = 0;
 150
 151         cmdline_conf = list_alloc((list_action_t)free_config);
 152
 153         while((r = getopt_long(argc, argv, "c:DLd::n:so:RU:", long_options, &option_index)) != EOF) {
 154                 switch (r) {
 155                         case 0:   /* long option */
 156                                 break;
 157
 158                         case 'c': /* config file */
 159                                 confbase = xstrdup(optarg);
 160                                 break;
 161
 162                         case 'D': /* no detach */
 163                                 do_detach = false;
 164                                 break;
 165
 166                         case 'L': /* no detach */
 167 #ifndef HAVE_MLOCKALL
 168                                 logger(DEBUG_ALWAYS, LOG_ERR, "The %s option is not supported on this platform.", argv[optind - 1]);
 169                                 return false;
 170 #else
 171                                 do_mlock = true;
 172                                 break;
 173 #endif
 174
 175                         case 'd': /* increase debug level */
 176                                 if(!optarg && optind < argc && *argv[optind] != '-')
 177                                         optarg = argv[optind++];
 178                                 if(optarg)
 179                                         debug_level = atoi(optarg);
 180                                 else
 181                                         debug_level++;
 182                                 break;
 183
 184                         case 'n': /* net name given */
 185                                 netname = xstrdup(optarg);
 186                                 break;
 187
 188                         case 's': /* syslog */
 189                                 use_syslog = true;
 190                                 break;
 191
 192                         case 'o': /* option */
 193                                 cfg = parse_config_line(optarg, NULL, ++lineno);
 194                                 if (!cfg)
 195                                         return false;
 196                                 list_insert_tail(cmdline_conf, cfg);
 197                                 break;
 198
 199 #ifdef HAVE_MINGW
 200                         case 'R':
 201                         case 'U':
 202                                 logger(DEBUG_ALWAYS, LOG_ERR, "The %s option is not supported on this platform.", argv[optind - 1]);
 203                                 return false;
 204 #else
 205                         case 'R': /* chroot to NETNAME dir */
 206                                 do_chroot = true;
 207                                 break;
 208
 209                         case 'U': /* setuid to USER */
 210                                 switchuser = optarg;
 211                                 break;
 212 #endif
 213
 214                         case 1:   /* show help */
 215                                 show_help = true;
 216                                 break;
 217
 218                         case 2:   /* show version */
 219                                 show_version = true;
 220                                 break;
 221
 222                         case 3:   /* bypass security */
 223                                 bypass_security = true;
 224                                 break;
 225
 226                         case 4:   /* write log entries to a file */
 227                                 use_logfile = true;
 228                                 if(!optarg && optind < argc && *argv[optind] != '-')
 229                                         optarg = argv[optind++];
 230                                 if(optarg)
 231                                         logfilename = xstrdup(optarg);
 232                                 break;
 233
 234                         case 5:   /* open control socket here */
 235                                 pidfilename = xstrdup(optarg);
 236                                 break;
 237
 238                         case '?': /* wrong options */
 239                                 usage(true);
 240                                 return false;
 241
 242                         default:
 243                                 break;
 244                 }
 245         }
 246
 247         if(optind < argc) {
 248                 fprintf(stderr, "%s: unrecognized argument '%s'\n", argv[0], argv[optind]);
 249                 usage(true);
 250                 return false;
 251         }
 252
 253         if(!netname && (netname = getenv("NETNAME")))
 254                 netname = xstrdup(netname);
 255
 256         /* netname "." is special: a "top-level name" */
 257
 258         if(netname && (!*netname || !strcmp(netname, "."))) {
 259                 free(netname);
 260                 netname = NULL;
 261         }
 262
 263         if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
 264                 fprintf(stderr, "Invalid character in netname!\n");
 265                 return false;
 266         }
 267
 268         return true;
 269 }
 270
 271 static bool drop_privs(void) {
 272 #ifndef HAVE_MINGW
 273         uid_t uid = 0;
 274         if (switchuser) {
 275                 struct passwd *pw = getpwnam(switchuser);
 276                 if (!pw) {
 277                         logger(DEBUG_ALWAYS, LOG_ERR, "unknown user `%s'", switchuser);
 278                         return false;
 279                 }
 280                 uid = pw->pw_uid;
 281                 if (initgroups(switchuser, pw->pw_gid) != 0 ||
 282                     setgid(pw->pw_gid) != 0) {
 283                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 284                                "initgroups", strerror(errno));
 285                         return false;
 286                 }
 287 #ifndef __ANDROID__
 288 // Not supported in android NDK
 289                 endgrent();
 290                 endpwent();
 291 #endif
 292         }
 293         if (do_chroot) {
 294                 tzset();        /* for proper timestamps in logs */
 295                 if (chroot(confbase) != 0 || chdir("/") != 0) {
 296                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 297                                "chroot", strerror(errno));
 298                         return false;
 299                 }
 300                 free(confbase);
 301                 confbase = xstrdup("");
 302         }
 303         if (switchuser)
 304                 if (setuid(uid) != 0) {
 305                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 306                                "setuid", strerror(errno));
 307                         return false;
 308                 }
 309 #endif
 310         return true;
 311 }
 312
 313 #ifdef HAVE_MINGW
 314 # define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
 315 #else
 316 # define NORMAL_PRIORITY_CLASS 0
 317 # define BELOW_NORMAL_PRIORITY_CLASS 10
 318 # define HIGH_PRIORITY_CLASS -10
 319 # define setpriority(level) (setpriority(PRIO_PROCESS, 0, (level)))
 320 #endif
 321
 322 int main(int argc, char **argv) {
 323         program_name = argv[0];
 324
 325         if(!parse_options(argc, argv))
 326                 return 1;
 327
 328         make_names();
 329
 330         if(show_version) {
 331                 printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
 332                            VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
 333                 printf("Copyright (C) 1998-2014 Ivo Timmermans, Guus Sliepen and others.\n"
 334                                 "See the AUTHORS file for a complete list.\n\n"
 335                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 336                                 "and you are welcome to redistribute it under certain conditions;\n"
 337                                 "see the file COPYING for details.\n");
 338
 339                 return 0;
 340         }
 341
 342         if(show_help) {
 343                 usage(false);
 344                 return 0;
 345         }
 346
 347 #ifdef HAVE_MINGW
 348         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 349                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 350                 return 1;
 351         }
 352 #endif
 353
 354         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 355
 356         g_argv = argv;
 357
 358         if(getenv("LISTEN_PID") && atoi(getenv("LISTEN_PID")) == getpid())
 359                 do_detach = false;
 360 #ifdef HAVE_UNSETENV
 361         unsetenv("LISTEN_PID");
 362 #endif
 363
 364         init_configuration(&config_tree);
 365
 366         /* Slllluuuuuuurrrrp! */
 367
 368         gettimeofday(&now, NULL);
 369         srand(now.tv_sec + now.tv_usec);
 370         crypto_init();
 371
 372         if(!read_server_config())
 373                 return 1;
 374
 375 #ifdef HAVE_LZO
 376         if(lzo_init() != LZO_E_OK) {
 377                 logger(DEBUG_ALWAYS, LOG_ERR, "Error initializing LZO compressor!");
 378                 return 1;
 379         }
 380 #endif
 381
 382 #ifdef HAVE_MINGW
 383         if(!do_detach || !init_service())
 384                 return main2(argc, argv);
 385         else
 386                 return 1;
 387 }
 388
 389 int main2(int argc, char **argv) {
 390         InitializeCriticalSection(&mutex);
 391         EnterCriticalSection(&mutex);
 392 #endif
 393         char *priority = NULL;
 394
 395         if(!detach())
 396                 return 1;
 397
 398 #ifdef HAVE_MLOCKALL
 399         /* Lock all pages into memory if requested.
 400          * This has to be done after daemon()/fork() so it works for child.
 401          * No need to do that in parent as it's very short-lived. */
 402         if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
 403                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "mlockall",
 404                    strerror(errno));
 405                 return 1;
 406         }
 407 #endif
 408
 409         /* Setup sockets and open device. */
 410
 411         if(!setup_network())
 412                 goto end;
 413
 414         /* Change process priority */
 415
 416         if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
 417                 if(!strcasecmp(priority, "Normal")) {
 418                         if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
 419                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
 420                                 goto end;
 421                         }
 422                 } else if(!strcasecmp(priority, "Low")) {
 423                         if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
 424                                        logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
 425                                 goto end;
 426                         }
 427                 } else if(!strcasecmp(priority, "High")) {
 428                         if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
 429                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
 430                                 goto end;
 431                         }
 432                 } else {
 433                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid priority `%s`!", priority);
 434                         goto end;
 435                 }
 436         }
 437
 438         /* drop privileges */
 439         if (!drop_privs())
 440                 goto end;
 441
 442         /* Start main loop. It only exits when tinc is killed. */
 443
 444         logger(DEBUG_ALWAYS, LOG_NOTICE, "Ready");
 445
 446         try_outgoing_connections();
 447
 448         status = main_loop();
 449
 450         /* Shutdown properly. */
 451
 452 end:
 453         close_network_connections();
 454
 455         logger(DEBUG_ALWAYS, LOG_NOTICE, "Terminating");
 456
 457         free(priority);
 458
 459         crypto_exit();
 460
 461         exit_configuration(&config_tree);
 462         free(cmdline_conf);
 463         free_names();
 464
 465         return status;
 466 }