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                   2000-2013 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 /* If nonzero, disable swapping for this process. */
  71 static bool do_mlock = false;
  72
  73 /* If nonzero, chroot to netdir after startup. */
  74 static bool do_chroot = false;
  75
  76 /* If !NULL, do setuid to given user after startup */
  77 static const char *switchuser = NULL;
  78
  79 /* If nonzero, write log entries to a separate file. */
  80 bool use_logfile = false;
  81
  82 char **g_argv;                  /* a copy of the cmdline arguments */
  83
  84 static int status = 1;
  85
  86 static struct option const long_options[] = {
  87         {"config", required_argument, NULL, 'c'},
  88         {"net", required_argument, NULL, 'n'},
  89         {"help", no_argument, NULL, 1},
  90         {"version", no_argument, NULL, 2},
  91         {"no-detach", no_argument, NULL, 'D'},
  92         {"debug", optional_argument, NULL, 'd'},
  93         {"bypass-security", no_argument, NULL, 3},
  94         {"mlock", no_argument, NULL, 'L'},
  95         {"chroot", no_argument, NULL, 'R'},
  96         {"user", required_argument, NULL, 'U'},
  97         {"logfile", optional_argument, NULL, 4},
  98         {"pidfile", required_argument, NULL, 5},
  99         {"option", required_argument, NULL, 'o'},
 100         {NULL, 0, NULL, 0}
 101 };
 102
 103 #ifdef HAVE_MINGW
 104 static struct WSAData wsa_state;
 105 CRITICAL_SECTION mutex;
 106 int main2(int argc, char **argv);
 107 #endif
 108
 109 static void usage(bool status) {
 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 #ifdef HAVE_MLOCKALL
 120                                 "  -L, --mlock                   Lock tinc into main memory.\n"
 121 #endif
 122                                 "      --logfile[=FILENAME]      Write log entries to a logfile.\n"
 123                                 "      --pidfile=FILENAME        Write PID and control socket cookie to FILENAME.\n"
 124                                 "      --bypass-security         Disables meta protocol security, for debugging.\n"
 125                                 "  -o, --option[HOST.]KEY=VALUE  Set global/host configuration value.\n"
 126 #ifndef HAVE_MINGW
 127                                 "  -R, --chroot                  chroot to NET dir at startup.\n"
 128                                 "  -U, --user=USER               setuid to given USER at startup.\n"
 129 #endif
 130                                 "      --help                    Display this help and exit.\n"
 131                                 "      --version                 Output version information and exit.\n\n");
 132                 printf("Report bugs to tinc@tinc-vpn.org.\n");
 133         }
 134 }
 135
 136 static bool parse_options(int argc, char **argv) {
 137         config_t *cfg;
 138         int r;
 139         int option_index = 0;
 140         int lineno = 0;
 141
 142         cmdline_conf = list_alloc((list_action_t)free_config);
 143
 144         while((r = getopt_long(argc, argv, "c:DLd::n:o:RU:", long_options, &option_index)) != EOF) {
 145                 switch (r) {
 146                         case 0:   /* long option */
 147                                 break;
 148
 149                         case 'c': /* config file */
 150                                 confbase = xstrdup(optarg);
 151                                 break;
 152
 153                         case 'D': /* no detach */
 154                                 do_detach = false;
 155                                 break;
 156
 157                         case 'L': /* no detach */
 158 #ifndef HAVE_MLOCKALL
 159                                 logger(DEBUG_ALWAYS, LOG_ERR, "The %s option is not supported on this platform.", argv[optind - 1]);
 160                                 return false;
 161 #else
 162                                 do_mlock = true;
 163                                 break;
 164 #endif
 165
 166                         case 'd': /* inc debug level */
 167                                 if(optarg)
 168                                         debug_level = atoi(optarg);
 169                                 else
 170                                         debug_level++;
 171                                 break;
 172
 173                         case 'n': /* net name given */
 174                                 netname = xstrdup(optarg);
 175                                 break;
 176
 177                         case 'o': /* option */
 178                                 cfg = parse_config_line(optarg, NULL, ++lineno);
 179                                 if (!cfg)
 180                                         return false;
 181                                 list_insert_tail(cmdline_conf, cfg);
 182                                 break;
 183
 184 #ifdef HAVE_MINGW
 185                         case 'R':
 186                         case 'U':
 187                                 logger(DEBUG_ALWAYS, LOG_ERR, "The %s option is not supported on this platform.", argv[optind - 1]);
 188                                 return false;
 189 #else
 190                         case 'R': /* chroot to NETNAME dir */
 191                                 do_chroot = true;
 192                                 break;
 193
 194                         case 'U': /* setuid to USER */
 195                                 switchuser = optarg;
 196                                 break;
 197 #endif
 198
 199                         case 1:   /* show help */
 200                                 show_help = true;
 201                                 break;
 202
 203                         case 2:   /* show version */
 204                                 show_version = true;
 205                                 break;
 206
 207                         case 3:   /* bypass security */
 208                                 bypass_security = true;
 209                                 break;
 210
 211                         case 4:   /* write log entries to a file */
 212                                 use_logfile = true;
 213                                 if(optarg)
 214                                         logfilename = xstrdup(optarg);
 215                                 break;
 216
 217                         case 5:   /* open control socket here */
 218                                 pidfilename = xstrdup(optarg);
 219                                 break;
 220
 221                         case '?': /* wrong options */
 222                                 usage(true);
 223                                 return false;
 224
 225                         default:
 226                                 break;
 227                 }
 228         }
 229
 230         if(!netname && (netname = getenv("NETNAME")))
 231                 netname = xstrdup(netname);
 232
 233         /* netname "." is special: a "top-level name" */
 234
 235         if(netname && (!*netname || !strcmp(netname, "."))) {
 236                 free(netname);
 237                 netname = NULL;
 238         }
 239
 240         if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
 241                 fprintf(stderr, "Invalid character in netname!\n");
 242                 return false;
 243         }
 244
 245         return true;
 246 }
 247
 248 static bool drop_privs(void) {
 249 #ifdef HAVE_MINGW
 250         return false;
 251 #else
 252         uid_t uid = 0;
 253         if (switchuser) {
 254                 struct passwd *pw = getpwnam(switchuser);
 255                 if (!pw) {
 256                         logger(DEBUG_ALWAYS, LOG_ERR, "unknown user `%s'", switchuser);
 257                         return false;
 258                 }
 259                 uid = pw->pw_uid;
 260                 if (initgroups(switchuser, pw->pw_gid) != 0 ||
 261                     setgid(pw->pw_gid) != 0) {
 262                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 263                                "initgroups", strerror(errno));
 264                         return false;
 265                 }
 266 #ifndef __ANDROID__
 267 // Not supported in android NDK
 268                 endgrent();
 269                 endpwent();
 270 #endif
 271         }
 272         if (do_chroot) {
 273                 tzset();        /* for proper timestamps in logs */
 274                 if (chroot(confbase) != 0 || chdir("/") != 0) {
 275                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 276                                "chroot", strerror(errno));
 277                         return false;
 278                 }
 279                 free(confbase);
 280                 confbase = xstrdup("");
 281         }
 282         if (switchuser)
 283                 if (setuid(uid) != 0) {
 284                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 285                                "setuid", strerror(errno));
 286                         return false;
 287                 }
 288 #endif
 289         return true;
 290 }
 291
 292 #ifdef HAVE_MINGW
 293 # define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
 294 #else
 295 # define NORMAL_PRIORITY_CLASS 0
 296 # define BELOW_NORMAL_PRIORITY_CLASS 10
 297 # define HIGH_PRIORITY_CLASS -10
 298 # define setpriority(level) (setpriority(PRIO_PROCESS, 0, (level)))
 299 #endif
 300
 301 int main(int argc, char **argv) {
 302         program_name = argv[0];
 303
 304         if(!parse_options(argc, argv))
 305                 return 1;
 306
 307         make_names();
 308
 309         if(show_version) {
 310                 printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
 311                            VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
 312                 printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
 313                                 "See the AUTHORS file for a complete list.\n\n"
 314                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 315                                 "and you are welcome to redistribute it under certain conditions;\n"
 316                                 "see the file COPYING for details.\n");
 317
 318                 return 0;
 319         }
 320
 321         if(show_help) {
 322                 usage(false);
 323                 return 0;
 324         }
 325
 326 #ifdef HAVE_MINGW
 327         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 328                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 329                 return 1;
 330         }
 331 #endif
 332
 333         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 334
 335         g_argv = argv;
 336
 337         if(getenv("LISTEN_PID") && atoi(getenv("LISTEN_PID")) == getpid())
 338                 do_detach = false;
 339 #ifdef HAVE_UNSETENV
 340         unsetenv("LISTEN_PID");
 341 #endif
 342
 343         init_configuration(&config_tree);
 344
 345         /* Slllluuuuuuurrrrp! */
 346
 347         srand(time(NULL));
 348         crypto_init();
 349
 350         if(!read_server_config())
 351                 return 1;
 352
 353 #ifdef HAVE_LZO
 354         if(lzo_init() != LZO_E_OK) {
 355                 logger(DEBUG_ALWAYS, LOG_ERR, "Error initializing LZO compressor!");
 356                 return 1;
 357         }
 358 #endif
 359
 360 #ifdef HAVE_MINGW
 361         if(!do_detach || !init_service())
 362                 return main2(argc, argv);
 363         else
 364                 return 1;
 365 }
 366
 367 int main2(int argc, char **argv) {
 368         InitializeCriticalSection(&mutex);
 369         EnterCriticalSection(&mutex);
 370 #endif
 371         char *priority = NULL;
 372
 373         if(!detach())
 374                 return 1;
 375
 376 #ifdef HAVE_MLOCKALL
 377         /* Lock all pages into memory if requested.
 378          * This has to be done after daemon()/fork() so it works for child.
 379          * No need to do that in parent as it's very short-lived. */
 380         if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
 381                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "mlockall",
 382                    strerror(errno));
 383                 return 1;
 384         }
 385 #endif
 386
 387         /* Setup sockets and open device. */
 388
 389         if(!setup_network())
 390                 goto end_nonet;
 391
 392         if(!init_control())
 393                 goto end_nonet;
 394
 395         /* Initiate all outgoing connections. */
 396
 397         try_outgoing_connections();
 398
 399         /* Change process priority */
 400
 401         if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
 402                 if(!strcasecmp(priority, "Normal")) {
 403                         if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
 404                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
 405                                 goto end;
 406                         }
 407                 } else if(!strcasecmp(priority, "Low")) {
 408                         if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
 409                                        logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
 410                                 goto end;
 411                         }
 412                 } else if(!strcasecmp(priority, "High")) {
 413                         if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
 414                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
 415                                 goto end;
 416                         }
 417                 } else {
 418                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid priority `%s`!", priority);
 419                         goto end;
 420                 }
 421         }
 422
 423         /* drop privileges */
 424         if (!drop_privs())
 425                 goto end;
 426
 427         /* Start main loop. It only exits when tinc is killed. */
 428
 429         status = main_loop();
 430
 431         /* Shutdown properly. */
 432
 433         if(debug_level >= DEBUG_CONNECTIONS)
 434                 devops.dump_stats();
 435
 436         close_network_connections();
 437
 438 end:
 439         exit_control();
 440
 441 end_nonet:
 442         logger(DEBUG_ALWAYS, LOG_NOTICE, "Terminating");
 443
 444         free(priority);
 445
 446         crypto_exit();
 447
 448         exit_configuration(&config_tree);
 449         free(cmdline_conf);
 450         free_names();
 451
 452         return status;
 453 }