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                   2000-2012 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 #include <openssl/rand.h>
  37 #include <openssl/rsa.h>
  38 #include <openssl/pem.h>
  39 #include <openssl/evp.h>
  40 #include <openssl/engine.h>
  41
  42 #ifdef HAVE_LZO
  43 #include LZO1X_H
  44 #endif
  45
  46 #ifndef HAVE_MINGW
  47 #include <pwd.h>
  48 #include <grp.h>
  49 #include <time.h>
  50 #endif
  51
  52 #include <getopt.h>
  53
  54 #include "conf.h"
  55 #include "control.h"
  56 #include "crypto.h"
  57 #include "device.h"
  58 #include "logger.h"
  59 #include "net.h"
  60 #include "netutl.h"
  61 #include "process.h"
  62 #include "protocol.h"
  63 #include "utils.h"
  64 #include "xalloc.h"
  65
  66 /* The name this program was run with. */
  67 char *program_name = NULL;
  68
  69 /* If nonzero, display usage information and exit. */
  70 static bool show_help = false;
  71
  72 /* If nonzero, print the version on standard output and exit.  */
  73 static bool show_version = false;
  74
  75 /* If nonzero, use null ciphers and skip all key exchanges. */
  76 bool bypass_security = false;
  77
  78 /* If nonzero, disable swapping for this process. */
  79 static bool do_mlock = false;
  80
  81 /* If nonzero, chroot to netdir after startup. */
  82 static bool do_chroot = false;
  83
  84 /* If !NULL, do setuid to given user after startup */
  85 static const char *switchuser = NULL;
  86
  87 /* If nonzero, write log entries to a separate file. */
  88 bool use_logfile = false;
  89
  90 char *identname = NULL;                         /* program name for syslog */
  91 char *logfilename = NULL;                       /* log file location */
  92 char *pidfilename = NULL;
  93 char **g_argv;                                  /* a copy of the cmdline arguments */
  94
  95 static int status = 1;
  96
  97 static struct option const long_options[] = {
  98         {"config", required_argument, NULL, 'c'},
  99         {"net", required_argument, NULL, 'n'},
 100         {"help", no_argument, NULL, 1},
 101         {"version", no_argument, NULL, 2},
 102         {"no-detach", no_argument, NULL, 'D'},
 103         {"debug", optional_argument, NULL, 'd'},
 104         {"bypass-security", no_argument, NULL, 3},
 105         {"mlock", no_argument, NULL, 'L'},
 106         {"chroot", no_argument, NULL, 'R'},
 107         {"user", required_argument, NULL, 'U'},
 108         {"logfile", optional_argument, NULL, 4},
 109         {"pidfile", required_argument, NULL, 5},
 110         {"option", required_argument, NULL, 'o'},
 111         {NULL, 0, NULL, 0}
 112 };
 113
 114 #ifdef HAVE_MINGW
 115 static struct WSAData wsa_state;
 116 CRITICAL_SECTION mutex;
 117 int main2(int argc, char **argv);
 118 #endif
 119
 120 static void usage(bool status) {
 121         if(status)
 122                 fprintf(stderr, "Try `%s --help\' for more information.\n",
 123                                 program_name);
 124         else {
 125                 printf("Usage: %s [option]...\n\n", program_name);
 126                 printf( "  -c, --config=DIR              Read configuration options from DIR.\n"
 127                                 "  -D, --no-detach               Don't fork and detach.\n"
 128                                 "  -d, --debug[=LEVEL]           Increase debug level or set it to LEVEL.\n"
 129                                 "  -n, --net=NETNAME             Connect to net NETNAME.\n"
 130                                 "  -L, --mlock                   Lock tinc into main memory.\n"
 131                                 "      --logfile[=FILENAME]      Write log entries to a logfile.\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                                 "  -R, --chroot                  chroot to NET dir at startup.\n"
 136                                 "  -U, --user=USER               setuid to given USER at startup.\n"                            "      --help                    Display this help and exit.\n"
 137                                 "      --version                 Output version information and exit.\n\n");
 138                 printf("Report bugs to tinc@tinc-vpn.org.\n");
 139         }
 140 }
 141
 142 static bool parse_options(int argc, char **argv) {
 143         config_t *cfg;
 144         int r;
 145         int option_index = 0;
 146         int lineno = 0;
 147
 148         cmdline_conf = list_alloc((list_action_t)free_config);
 149
 150         while((r = getopt_long(argc, argv, "c:DLd::n:o:RU:", long_options, &option_index)) != EOF) {
 151                 switch (r) {
 152                         case 0:                         /* long option */
 153                                 break;
 154
 155                         case 'c':                               /* config file */
 156                                 confbase = xstrdup(optarg);
 157                                 break;
 158
 159                         case 'D':                               /* no detach */
 160                                 do_detach = false;
 161                                 break;
 162
 163                         case 'L':                               /* no detach */
 164 #ifndef HAVE_MLOCKALL
 165                                 logger(DEBUG_ALWAYS, LOG_ERR, "%s not supported on this platform", "mlockall()");
 166                                 return false;
 167 #else
 168                                 do_mlock = true;
 169                                 break;
 170 #endif
 171
 172                         case 'd':                               /* inc debug level */
 173                                 if(optarg)
 174                                         debug_level = atoi(optarg);
 175                                 else
 176                                         debug_level++;
 177                                 break;
 178
 179                         case 'n':                               /* net name given */
 180                                 netname = xstrdup(optarg);
 181                                 break;
 182
 183                         case 'o':                               /* option */
 184                                 cfg = parse_config_line(optarg, NULL, ++lineno);
 185                                 if (!cfg)
 186                                         return false;
 187                                 list_insert_tail(cmdline_conf, cfg);
 188                                 break;
 189
 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
 198                         case 1:                                 /* show help */
 199                                 show_help = true;
 200                                 break;
 201
 202                         case 2:                                 /* show version */
 203                                 show_version = true;
 204                                 break;
 205
 206                         case 3:                                 /* bypass security */
 207                                 bypass_security = true;
 208                                 break;
 209
 210                         case 4:                                 /* write log entries to a file */
 211                                 use_logfile = true;
 212                                 if(optarg)
 213                                         logfilename = xstrdup(optarg);
 214                                 break;
 215
 216                         case 5:                                 /* open control socket here */
 217                                 pidfilename = xstrdup(optarg);
 218                                 break;
 219
 220                         case '?':
 221                                 usage(true);
 222                                 return false;
 223
 224                         default:
 225                                 break;
 226                 }
 227         }
 228
 229         if(!netname && (netname = getenv("NETNAME")))
 230                 netname = xstrdup(netname);
 231
 232         /* netname "." is special: a "top-level name" */
 233
 234         if(netname && !strcmp(netname, ".")) {
 235                 free(netname);
 236                 netname = NULL;
 237         }
 238
 239         return true;
 240 }
 241
 242 /*
 243   Set all files and paths according to netname
 244 */
 245 static void make_names(void) {
 246 #ifdef HAVE_MINGW
 247         HKEY key;
 248         char installdir[1024] = "";
 249         long len = sizeof installdir;
 250 #endif
 251
 252         if(netname)
 253                 xasprintf(&identname, "tinc.%s", netname);
 254         else
 255                 identname = xstrdup("tinc");
 256
 257 #ifdef HAVE_MINGW
 258         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 259                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 260                         if(!logfilename)
 261                                 xasprintf(&logfilename, "%s" SLASH "log" SLASH "%s.log", identname);
 262                         if(!confbase) {
 263                                 if(netname)
 264                                         xasprintf(&confbase, "%s" SLASH "%s", installdir, netname);
 265                                 else
 266                                         xasprintf(&confbase, "%s", installdir);
 267                         }
 268                         if(!pidfilename)
 269                                 xasprintf(&pidfilename, "%s" SLASH "pid", confbase);
 270                 }
 271                 RegCloseKey(key);
 272                 if(*installdir)
 273                         return;
 274         }
 275 #endif
 276
 277         if(!logfilename)
 278                 xasprintf(&logfilename, LOCALSTATEDIR SLASH "log" SLASH "%s.log", identname);
 279
 280         if(!pidfilename)
 281                 xasprintf(&pidfilename, LOCALSTATEDIR SLASH "run" SLASH "%s.pid", identname);
 282
 283         if(netname) {
 284                 if(!confbase)
 285                         xasprintf(&confbase, CONFDIR SLASH "tinc" SLASH "%s", netname);
 286                 else
 287                         logger(DEBUG_ALWAYS, LOG_INFO, "Both netname and configuration directory given, using the latter...");
 288         } else {
 289                 if(!confbase)
 290                         xasprintf(&confbase, CONFDIR SLASH "tinc");
 291         }
 292 }
 293
 294 static void free_names(void) {
 295         if (identname) free(identname);
 296         if (netname) free(netname);
 297         if (pidfilename) free(pidfilename);
 298         if (logfilename) free(logfilename);
 299         if (confbase) free(confbase);
 300 }
 301
 302 static bool drop_privs(void) {
 303 #ifdef HAVE_MINGW
 304         if (switchuser) {
 305                 logger(DEBUG_ALWAYS, LOG_ERR, "%s not supported on this platform", "-U");
 306                 return false;
 307         }
 308         if (do_chroot) {
 309                 logger(DEBUG_ALWAYS, LOG_ERR, "%s not supported on this platform", "-R");
 310                 return false;
 311         }
 312 #else
 313         uid_t uid = 0;
 314         if (switchuser) {
 315                 struct passwd *pw = getpwnam(switchuser);
 316                 if (!pw) {
 317                         logger(DEBUG_ALWAYS, LOG_ERR, "unknown user `%s'", switchuser);
 318                         return false;
 319                 }
 320                 uid = pw->pw_uid;
 321                 if (initgroups(switchuser, pw->pw_gid) != 0 ||
 322                     setgid(pw->pw_gid) != 0) {
 323                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 324                                "initgroups", strerror(errno));
 325                         return false;
 326                 }
 327                 endgrent();
 328                 endpwent();
 329         }
 330         if (do_chroot) {
 331                 tzset();        /* for proper timestamps in logs */
 332                 if (chroot(confbase) != 0 || chdir("/") != 0) {
 333                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 334                                "chroot", strerror(errno));
 335                         return false;
 336                 }
 337                 free(confbase);
 338                 confbase = xstrdup("");
 339         }
 340         if (switchuser)
 341                 if (setuid(uid) != 0) {
 342                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 343                                "setuid", strerror(errno));
 344                         return false;
 345                 }
 346 #endif
 347         return true;
 348 }
 349
 350 #ifdef HAVE_MINGW
 351 # define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
 352 #else
 353 # define NORMAL_PRIORITY_CLASS 0
 354 # define BELOW_NORMAL_PRIORITY_CLASS 10
 355 # define HIGH_PRIORITY_CLASS -10
 356 # define setpriority(level) (setpriority(PRIO_PROCESS, 0, (level)))
 357 #endif
 358
 359 int main(int argc, char **argv) {
 360         program_name = argv[0];
 361
 362         if(!parse_options(argc, argv))
 363                 return 1;
 364
 365         make_names();
 366
 367         if(show_version) {
 368                 printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
 369                            VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
 370                 printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
 371                                 "See the AUTHORS file for a complete list.\n\n"
 372                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 373                                 "and you are welcome to redistribute it under certain conditions;\n"
 374                                 "see the file COPYING for details.\n");
 375
 376                 return 0;
 377         }
 378
 379         if(show_help) {
 380                 usage(false);
 381                 return 0;
 382         }
 383
 384 #ifdef HAVE_MINGW
 385         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 386                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 387                 return 1;
 388         }
 389 #endif
 390
 391         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 392
 393         g_argv = argv;
 394
 395         if(getenv("LISTEN_PID") && atoi(getenv("LISTEN_PID")) == getpid())
 396                 do_detach = false;
 397 #ifdef HAVE_UNSETENV
 398         unsetenv("LISTEN_PID");
 399 #endif
 400
 401         init_configuration(&config_tree);
 402
 403         /* Slllluuuuuuurrrrp! */
 404
 405         srand(time(NULL));
 406         crypto_init();
 407
 408         if(!read_server_config())
 409                 return 1;
 410
 411 #ifdef HAVE_LZO
 412         if(lzo_init() != LZO_E_OK) {
 413                 logger(DEBUG_ALWAYS, LOG_ERR, "Error initializing LZO compressor!");
 414                 return 1;
 415         }
 416 #endif
 417
 418 #ifdef HAVE_MINGW
 419         if(!do_detach || !init_service())
 420                 return main2(argc, argv);
 421         else
 422                 return 1;
 423 }
 424
 425 int main2(int argc, char **argv) {
 426         InitializeCriticalSection(&mutex);
 427         EnterCriticalSection(&mutex);
 428 #endif
 429         char *priority = NULL;
 430
 431         if(!detach())
 432                 return 1;
 433
 434 #ifdef HAVE_MLOCKALL
 435         /* Lock all pages into memory if requested.
 436          * This has to be done after daemon()/fork() so it works for child.
 437          * No need to do that in parent as it's very short-lived. */
 438         if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
 439                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "mlockall",
 440                    strerror(errno));
 441                 return 1;
 442         }
 443 #endif
 444
 445         if(!event_init()) {
 446                 logger(DEBUG_ALWAYS, LOG_ERR, "Error initializing libevent!");
 447                 return 1;
 448         }
 449
 450         /* Setup sockets and open device. */
 451
 452         if(!setup_network())
 453                 goto end_nonet;
 454
 455         if(!init_control())
 456                 goto end_nonet;
 457
 458         /* Initiate all outgoing connections. */
 459
 460         try_outgoing_connections();
 461
 462         /* Change process priority */
 463
 464         if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
 465                 if(!strcasecmp(priority, "Normal")) {
 466                         if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
 467                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 468                                        "setpriority", strerror(errno));
 469                                 goto end;
 470                         }
 471                 } else if(!strcasecmp(priority, "Low")) {
 472                         if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
 473                                        logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 474                                        "setpriority", strerror(errno));
 475                                 goto end;
 476                         }
 477                 } else if(!strcasecmp(priority, "High")) {
 478                         if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
 479                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 480                                        "setpriority", strerror(errno));
 481                                 goto end;
 482                         }
 483                 } else {
 484                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid priority `%s`!", priority);
 485                         goto end;
 486                 }
 487         }
 488
 489         /* drop privileges */
 490         if (!drop_privs())
 491                 goto end;
 492
 493         /* Start main loop. It only exits when tinc is killed. */
 494
 495         status = main_loop();
 496
 497         /* Shutdown properly. */
 498
 499         if(debug_level >= DEBUG_CONNECTIONS)
 500                 devops.dump_stats();
 501
 502         close_network_connections();
 503
 504 end:
 505         exit_control();
 506
 507 end_nonet:
 508         logger(DEBUG_ALWAYS, LOG_NOTICE, "Terminating");
 509
 510         free(priority);
 511
 512         crypto_exit();
 513
 514         exit_configuration(&config_tree);
 515         free(cmdline_conf);
 516         free_names();
 517
 518         return status;
 519 }