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 #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 "names.h"
  60 #include "net.h"
  61 #include "netutl.h"
  62 #include "process.h"
  63 #include "protocol.h"
  64 #include "utils.h"
  65 #include "xalloc.h"
  66
  67 /* If nonzero, display usage information and exit. */
  68 static bool show_help = false;
  69
  70 /* If nonzero, print the version on standard output and exit.  */
  71 static bool show_version = false;
  72
  73 /* If nonzero, use null ciphers and skip all key exchanges. */
  74 bool bypass_security = false;
  75
  76 /* If nonzero, disable swapping for this process. */
  77 static bool do_mlock = false;
  78
  79 /* If nonzero, chroot to netdir after startup. */
  80 static bool do_chroot = false;
  81
  82 /* If !NULL, do setuid to given user after startup */
  83 static const char *switchuser = NULL;
  84
  85 /* If nonzero, write log entries to a separate file. */
  86 bool use_logfile = false;
  87
  88 char **g_argv;                  /* a copy of the cmdline arguments */
  89
  90 static int status = 1;
  91
  92 static struct option const long_options[] = {
  93         {"config", required_argument, NULL, 'c'},
  94         {"net", required_argument, NULL, 'n'},
  95         {"help", no_argument, NULL, 1},
  96         {"version", no_argument, NULL, 2},
  97         {"no-detach", no_argument, NULL, 'D'},
  98         {"debug", optional_argument, NULL, 'd'},
  99         {"bypass-security", no_argument, NULL, 3},
 100         {"mlock", no_argument, NULL, 'L'},
 101         {"chroot", no_argument, NULL, 'R'},
 102         {"user", required_argument, NULL, 'U'},
 103         {"logfile", optional_argument, NULL, 4},
 104         {"pidfile", required_argument, NULL, 5},
 105         {"option", required_argument, NULL, 'o'},
 106         {NULL, 0, NULL, 0}
 107 };
 108
 109 #ifdef HAVE_MINGW
 110 static struct WSAData wsa_state;
 111 CRITICAL_SECTION mutex;
 112 int main2(int argc, char **argv);
 113 #endif
 114
 115 static void usage(bool status) {
 116         if(status)
 117                 fprintf(stderr, "Try `%s --help\' for more information.\n",
 118                                 program_name);
 119         else {
 120                 printf("Usage: %s [option]...\n\n", program_name);
 121                 printf( "  -c, --config=DIR              Read configuration options from DIR.\n"
 122                                 "  -D, --no-detach               Don't fork and detach.\n"
 123                                 "  -d, --debug[=LEVEL]           Increase debug level or set it to LEVEL.\n"
 124                                 "  -n, --net=NETNAME             Connect to net NETNAME.\n"
 125 #ifdef HAVE_MLOCKALL
 126                                 "  -L, --mlock                   Lock tinc into main memory.\n"
 127 #endif
 128                                 "      --logfile[=FILENAME]      Write log entries to a logfile.\n"
 129                                 "      --pidfile=FILENAME        Write PID and control socket cookie to FILENAME.\n"
 130                                 "      --bypass-security         Disables meta protocol security, for debugging.\n"
 131                                 "  -o, --option[HOST.]KEY=VALUE  Set global/host configuration value.\n"
 132 #ifndef HAVE_MINGW
 133                                 "  -R, --chroot                  chroot to NET dir at startup.\n"
 134                                 "  -U, --user=USER               setuid to given USER at startup.\n"
 135 #endif
 136                                 "      --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, "The %s option is not supported on this platform.", argv[optind - 1]);
 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 #ifdef HAVE_MINGW
 191                         case 'R':
 192                         case 'U':
 193                                 logger(DEBUG_ALWAYS, LOG_ERR, "The %s option is not supported on this platform.", argv[optind - 1]);
 194                                 return false;
 195 #else
 196                         case 'R': /* chroot to NETNAME dir */
 197                                 do_chroot = true;
 198                                 break;
 199
 200                         case 'U': /* setuid to USER */
 201                                 switchuser = optarg;
 202                                 break;
 203 #endif
 204
 205                         case 1:   /* show help */
 206                                 show_help = true;
 207                                 break;
 208
 209                         case 2:   /* show version */
 210                                 show_version = true;
 211                                 break;
 212
 213                         case 3:   /* bypass security */
 214                                 bypass_security = true;
 215                                 break;
 216
 217                         case 4:   /* write log entries to a file */
 218                                 use_logfile = true;
 219                                 if(optarg)
 220                                         logfilename = xstrdup(optarg);
 221                                 break;
 222
 223                         case 5:   /* open control socket here */
 224                                 pidfilename = xstrdup(optarg);
 225                                 break;
 226
 227                         case '?': /* wrong options */
 228                                 usage(true);
 229                                 return false;
 230
 231                         default:
 232                                 break;
 233                 }
 234         }
 235
 236         if(!netname && (netname = getenv("NETNAME")))
 237                 netname = xstrdup(netname);
 238
 239         /* netname "." is special: a "top-level name" */
 240
 241         if(netname && (!*netname || !strcmp(netname, "."))) {
 242                 free(netname);
 243                 netname = NULL;
 244         }
 245
 246         if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
 247                 fprintf(stderr, "Invalid character in netname!\n");
 248                 return false;
 249         }
 250
 251         return true;
 252 }
 253
 254 static bool drop_privs(void) {
 255 #ifdef HAVE_MINGW
 256         return false;
 257 #else
 258         uid_t uid = 0;
 259         if (switchuser) {
 260                 struct passwd *pw = getpwnam(switchuser);
 261                 if (!pw) {
 262                         logger(DEBUG_ALWAYS, LOG_ERR, "unknown user `%s'", switchuser);
 263                         return false;
 264                 }
 265                 uid = pw->pw_uid;
 266                 if (initgroups(switchuser, pw->pw_gid) != 0 ||
 267                     setgid(pw->pw_gid) != 0) {
 268                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 269                                "initgroups", strerror(errno));
 270                         return false;
 271                 }
 272 #ifndef __ANDROID__
 273 // Not supported in android NDK
 274                 endgrent();
 275                 endpwent();
 276 #endif
 277         }
 278         if (do_chroot) {
 279                 tzset();        /* for proper timestamps in logs */
 280                 if (chroot(confbase) != 0 || chdir("/") != 0) {
 281                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 282                                "chroot", strerror(errno));
 283                         return false;
 284                 }
 285                 free(confbase);
 286                 confbase = xstrdup("");
 287         }
 288         if (switchuser)
 289                 if (setuid(uid) != 0) {
 290                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 291                                "setuid", strerror(errno));
 292                         return false;
 293                 }
 294 #endif
 295         return true;
 296 }
 297
 298 #ifdef HAVE_MINGW
 299 # define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
 300 #else
 301 # define NORMAL_PRIORITY_CLASS 0
 302 # define BELOW_NORMAL_PRIORITY_CLASS 10
 303 # define HIGH_PRIORITY_CLASS -10
 304 # define setpriority(level) (setpriority(PRIO_PROCESS, 0, (level)))
 305 #endif
 306
 307 int main(int argc, char **argv) {
 308         program_name = argv[0];
 309
 310         if(!parse_options(argc, argv))
 311                 return 1;
 312
 313         make_names();
 314
 315         if(show_version) {
 316                 printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
 317                            VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
 318                 printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
 319                                 "See the AUTHORS file for a complete list.\n\n"
 320                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 321                                 "and you are welcome to redistribute it under certain conditions;\n"
 322                                 "see the file COPYING for details.\n");
 323
 324                 return 0;
 325         }
 326
 327         if(show_help) {
 328                 usage(false);
 329                 return 0;
 330         }
 331
 332 #ifdef HAVE_MINGW
 333         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 334                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 335                 return 1;
 336         }
 337 #endif
 338
 339         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 340
 341         g_argv = argv;
 342
 343         if(getenv("LISTEN_PID") && atoi(getenv("LISTEN_PID")) == getpid())
 344                 do_detach = false;
 345 #ifdef HAVE_UNSETENV
 346         unsetenv("LISTEN_PID");
 347 #endif
 348
 349         init_configuration(&config_tree);
 350
 351         /* Slllluuuuuuurrrrp! */
 352
 353         srand(time(NULL));
 354         crypto_init();
 355
 356         if(!read_server_config())
 357                 return 1;
 358
 359 #ifdef HAVE_LZO
 360         if(lzo_init() != LZO_E_OK) {
 361                 logger(DEBUG_ALWAYS, LOG_ERR, "Error initializing LZO compressor!");
 362                 return 1;
 363         }
 364 #endif
 365
 366 #ifdef HAVE_MINGW
 367         if(!do_detach || !init_service())
 368                 return main2(argc, argv);
 369         else
 370                 return 1;
 371 }
 372
 373 int main2(int argc, char **argv) {
 374         InitializeCriticalSection(&mutex);
 375         EnterCriticalSection(&mutex);
 376 #endif
 377         char *priority = NULL;
 378
 379         if(!detach())
 380                 return 1;
 381
 382 #ifdef HAVE_MLOCKALL
 383         /* Lock all pages into memory if requested.
 384          * This has to be done after daemon()/fork() so it works for child.
 385          * No need to do that in parent as it's very short-lived. */
 386         if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
 387                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "mlockall",
 388                    strerror(errno));
 389                 return 1;
 390         }
 391 #endif
 392
 393         /* Setup sockets and open device. */
 394
 395         if(!setup_network())
 396                 goto end_nonet;
 397
 398         if(!init_control())
 399                 goto end_nonet;
 400
 401         /* Initiate all outgoing connections. */
 402
 403         try_outgoing_connections();
 404
 405         /* Change process priority */
 406
 407         if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
 408                 if(!strcasecmp(priority, "Normal")) {
 409                         if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
 410                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
 411                                 goto end;
 412                         }
 413                 } else if(!strcasecmp(priority, "Low")) {
 414                         if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
 415                                        logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
 416                                 goto end;
 417                         }
 418                 } else if(!strcasecmp(priority, "High")) {
 419                         if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
 420                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
 421                                 goto end;
 422                         }
 423                 } else {
 424                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid priority `%s`!", priority);
 425                         goto end;
 426                 }
 427         }
 428
 429         /* drop privileges */
 430         if (!drop_privs())
 431                 goto end;
 432
 433         /* Start main loop. It only exits when tinc is killed. */
 434
 435         status = main_loop();
 436
 437         /* Shutdown properly. */
 438
 439         if(debug_level >= DEBUG_CONNECTIONS)
 440                 devops.dump_stats();
 441
 442         close_network_connections();
 443
 444 end:
 445         exit_control();
 446
 447 end_nonet:
 448         logger(DEBUG_ALWAYS, LOG_NOTICE, "Terminating");
 449
 450         free(priority);
 451
 452         crypto_exit();
 453
 454         exit_configuration(&config_tree);
 455         free(cmdline_conf);
 456         free_names();
 457
 458         return status;
 459 }