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 #ifdef HAVE_MLOCKALL
 131                                 "  -L, --mlock                   Lock tinc into main memory.\n"
 132 #endif
 133                                 "      --logfile[=FILENAME]      Write log entries to a logfile.\n"
 134                                 "      --pidfile=FILENAME        Write PID and control socket cookie to FILENAME.\n"
 135                                 "      --bypass-security         Disables meta protocol security, for debugging.\n"
 136                                 "  -o, --option[HOST.]KEY=VALUE  Set global/host configuration value.\n"
 137 #ifndef HAVE_MINGW
 138                                 "  -R, --chroot                  chroot to NET dir at startup.\n"
 139                                 "  -U, --user=USER               setuid to given USER at startup.\n"
 140 #endif
 141                                 "      --help                    Display this help and exit.\n"
 142                                 "      --version                 Output version information and exit.\n\n");
 143                 printf("Report bugs to tinc@tinc-vpn.org.\n");
 144         }
 145 }
 146
 147 static bool parse_options(int argc, char **argv) {
 148         config_t *cfg;
 149         int r;
 150         int option_index = 0;
 151         int lineno = 0;
 152
 153         cmdline_conf = list_alloc((list_action_t)free_config);
 154
 155         while((r = getopt_long(argc, argv, "c:DLd::n:o:RU:", long_options, &option_index)) != EOF) {
 156                 switch (r) {
 157                         case 0:   /* long option */
 158                                 break;
 159
 160                         case 'c': /* config file */
 161                                 confbase = xstrdup(optarg);
 162                                 break;
 163
 164                         case 'D': /* no detach */
 165                                 do_detach = false;
 166                                 break;
 167
 168                         case 'L': /* no detach */
 169 #ifndef HAVE_MLOCKALL
 170                                 logger(DEBUG_ALWAYS, LOG_ERR, "The %s option is not supported on this platform.", argv[optind - 1]);
 171                                 return false;
 172 #else
 173                                 do_mlock = true;
 174                                 break;
 175 #endif
 176
 177                         case 'd': /* inc debug level */
 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 'o': /* option */
 189                                 cfg = parse_config_line(optarg, NULL, ++lineno);
 190                                 if (!cfg)
 191                                         return false;
 192                                 list_insert_tail(cmdline_conf, cfg);
 193                                 break;
 194
 195 #ifdef HAVE_MINGW
 196                         case 'R':
 197                         case 'U':
 198                                 logger(DEBUG_ALWAYS, LOG_ERR, "The %s option is not supported on this platform.", argv[optind - 1]);
 199                                 return false;
 200 #else
 201                         case 'R': /* chroot to NETNAME dir */
 202                                 do_chroot = true;
 203                                 break;
 204
 205                         case 'U': /* setuid to USER */
 206                                 switchuser = optarg;
 207                                 break;
 208 #endif
 209
 210                         case 1:   /* show help */
 211                                 show_help = true;
 212                                 break;
 213
 214                         case 2:   /* show version */
 215                                 show_version = true;
 216                                 break;
 217
 218                         case 3:   /* bypass security */
 219                                 bypass_security = true;
 220                                 break;
 221
 222                         case 4:   /* write log entries to a file */
 223                                 use_logfile = true;
 224                                 if(optarg)
 225                                         logfilename = xstrdup(optarg);
 226                                 break;
 227
 228                         case 5:   /* open control socket here */
 229                                 pidfilename = xstrdup(optarg);
 230                                 break;
 231
 232                         case '?': /* wrong options */
 233                                 usage(true);
 234                                 return false;
 235
 236                         default:
 237                                 break;
 238                 }
 239         }
 240
 241         if(!netname && (netname = getenv("NETNAME")))
 242                 netname = xstrdup(netname);
 243
 244         /* netname "." is special: a "top-level name" */
 245
 246         if(netname && (!*netname || !strcmp(netname, "."))) {
 247                 free(netname);
 248                 netname = NULL;
 249         }
 250
 251         if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
 252                 fprintf(stderr, "Invalid character in netname!\n");
 253                 return false;
 254         }
 255
 256         return true;
 257 }
 258
 259 /*
 260   Set all files and paths according to netname
 261 */
 262 static void make_names(void) {
 263 #ifdef HAVE_MINGW
 264         HKEY key;
 265         char installdir[1024] = "";
 266         long len = sizeof installdir;
 267 #endif
 268
 269         if(netname)
 270                 xasprintf(&identname, "tinc.%s", netname);
 271         else
 272                 identname = xstrdup("tinc");
 273
 274 #ifdef HAVE_MINGW
 275         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 276                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 277                         if(!logfilename)
 278                                 xasprintf(&logfilename, "%s" SLASH "log" SLASH "%s.log", identname);
 279                         if(!confbase) {
 280                                 if(netname)
 281                                         xasprintf(&confbase, "%s" SLASH "%s", installdir, netname);
 282                                 else
 283                                         xasprintf(&confbase, "%s", installdir);
 284                         }
 285                         if(!pidfilename)
 286                                 xasprintf(&pidfilename, "%s" SLASH "pid", confbase);
 287                 }
 288                 RegCloseKey(key);
 289                 if(*installdir)
 290                         return;
 291         }
 292 #endif
 293
 294         if(!logfilename)
 295                 xasprintf(&logfilename, LOCALSTATEDIR SLASH "log" SLASH "%s.log", identname);
 296
 297         if(!pidfilename)
 298                 xasprintf(&pidfilename, LOCALSTATEDIR SLASH "run" SLASH "%s.pid", identname);
 299
 300         if(netname) {
 301                 if(!confbase)
 302                         xasprintf(&confbase, CONFDIR SLASH "tinc" SLASH "%s", netname);
 303                 else
 304                         logger(DEBUG_ALWAYS, LOG_INFO, "Both netname and configuration directory given, using the latter...");
 305         } else {
 306                 if(!confbase)
 307                         xasprintf(&confbase, CONFDIR SLASH "tinc");
 308         }
 309 }
 310
 311 static void free_names(void) {
 312         if (identname) free(identname);
 313         if (netname) free(netname);
 314         if (pidfilename) free(pidfilename);
 315         if (logfilename) free(logfilename);
 316         if (confbase) free(confbase);
 317 }
 318
 319 static bool drop_privs(void) {
 320 #ifdef HAVE_MINGW
 321         return false;
 322 #else
 323         uid_t uid = 0;
 324         if (switchuser) {
 325                 struct passwd *pw = getpwnam(switchuser);
 326                 if (!pw) {
 327                         logger(DEBUG_ALWAYS, LOG_ERR, "unknown user `%s'", switchuser);
 328                         return false;
 329                 }
 330                 uid = pw->pw_uid;
 331                 if (initgroups(switchuser, pw->pw_gid) != 0 ||
 332                     setgid(pw->pw_gid) != 0) {
 333                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 334                                "initgroups", strerror(errno));
 335                         return false;
 336                 }
 337 #ifndef __ANDROID__
 338 // Not supported in android NDK
 339                 endgrent();
 340                 endpwent();
 341 #endif
 342         }
 343         if (do_chroot) {
 344                 tzset();        /* for proper timestamps in logs */
 345                 if (chroot(confbase) != 0 || chdir("/") != 0) {
 346                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 347                                "chroot", strerror(errno));
 348                         return false;
 349                 }
 350                 free(confbase);
 351                 confbase = xstrdup("");
 352         }
 353         if (switchuser)
 354                 if (setuid(uid) != 0) {
 355                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 356                                "setuid", strerror(errno));
 357                         return false;
 358                 }
 359 #endif
 360         return true;
 361 }
 362
 363 #ifdef HAVE_MINGW
 364 # define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
 365 #else
 366 # define NORMAL_PRIORITY_CLASS 0
 367 # define BELOW_NORMAL_PRIORITY_CLASS 10
 368 # define HIGH_PRIORITY_CLASS -10
 369 # define setpriority(level) (setpriority(PRIO_PROCESS, 0, (level)))
 370 #endif
 371
 372 int main(int argc, char **argv) {
 373         program_name = argv[0];
 374
 375         if(!parse_options(argc, argv))
 376                 return 1;
 377
 378         make_names();
 379
 380         if(show_version) {
 381                 printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
 382                            VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
 383                 printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
 384                                 "See the AUTHORS file for a complete list.\n\n"
 385                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 386                                 "and you are welcome to redistribute it under certain conditions;\n"
 387                                 "see the file COPYING for details.\n");
 388
 389                 return 0;
 390         }
 391
 392         if(show_help) {
 393                 usage(false);
 394                 return 0;
 395         }
 396
 397 #ifdef HAVE_MINGW
 398         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 399                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 400                 return 1;
 401         }
 402 #endif
 403
 404         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 405
 406         g_argv = argv;
 407
 408         if(getenv("LISTEN_PID") && atoi(getenv("LISTEN_PID")) == getpid())
 409                 do_detach = false;
 410 #ifdef HAVE_UNSETENV
 411         unsetenv("LISTEN_PID");
 412 #endif
 413
 414         init_configuration(&config_tree);
 415
 416         /* Slllluuuuuuurrrrp! */
 417
 418         srand(time(NULL));
 419         crypto_init();
 420
 421         if(!read_server_config())
 422                 return 1;
 423
 424 #ifdef HAVE_LZO
 425         if(lzo_init() != LZO_E_OK) {
 426                 logger(DEBUG_ALWAYS, LOG_ERR, "Error initializing LZO compressor!");
 427                 return 1;
 428         }
 429 #endif
 430
 431 #ifdef HAVE_MINGW
 432         if(!do_detach || !init_service())
 433                 return main2(argc, argv);
 434         else
 435                 return 1;
 436 }
 437
 438 int main2(int argc, char **argv) {
 439         InitializeCriticalSection(&mutex);
 440         EnterCriticalSection(&mutex);
 441 #endif
 442         char *priority = NULL;
 443
 444         if(!detach())
 445                 return 1;
 446
 447 #ifdef HAVE_MLOCKALL
 448         /* Lock all pages into memory if requested.
 449          * This has to be done after daemon()/fork() so it works for child.
 450          * No need to do that in parent as it's very short-lived. */
 451         if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
 452                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "mlockall",
 453                    strerror(errno));
 454                 return 1;
 455         }
 456 #endif
 457
 458         /* Setup sockets and open device. */
 459
 460         if(!setup_network())
 461                 goto end_nonet;
 462
 463         if(!init_control())
 464                 goto end_nonet;
 465
 466         /* Initiate all outgoing connections. */
 467
 468         try_outgoing_connections();
 469
 470         /* Change process priority */
 471
 472         if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
 473                 if(!strcasecmp(priority, "Normal")) {
 474                         if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
 475                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
 476                                 goto end;
 477                         }
 478                 } else if(!strcasecmp(priority, "Low")) {
 479                         if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
 480                                        logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
 481                                 goto end;
 482                         }
 483                 } else if(!strcasecmp(priority, "High")) {
 484                         if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
 485                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
 486                                 goto end;
 487                         }
 488                 } else {
 489                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid priority `%s`!", priority);
 490                         goto end;
 491                 }
 492         }
 493
 494         /* drop privileges */
 495         if (!drop_privs())
 496                 goto end;
 497
 498         /* Start main loop. It only exits when tinc is killed. */
 499
 500         status = main_loop();
 501
 502         /* Shutdown properly. */
 503
 504         if(debug_level >= DEBUG_CONNECTIONS)
 505                 devops.dump_stats();
 506
 507         close_network_connections();
 508
 509 end:
 510         exit_control();
 511
 512 end_nonet:
 513         logger(DEBUG_ALWAYS, LOG_NOTICE, "Terminating");
 514
 515         free(priority);
 516
 517         crypto_exit();
 518
 519         exit_configuration(&config_tree);
 520         free(cmdline_conf);
 521         free_names();
 522
 523         return status;
 524 }