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                   2000-2011 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(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 "." is special: a "top-level name" */
 181                                 netname = strcmp(optarg, ".") != 0 ?
 182                                                 xstrdup(optarg) : NULL;
 183                                 break;
 184
 185                         case 'o':                               /* option */
 186                                 cfg = parse_config_line(optarg, NULL, ++lineno);
 187                                 if (!cfg)
 188                                         return false;
 189                                 list_insert_tail(cmdline_conf, cfg);
 190                                 break;
 191
 192                         case 'R':                               /* chroot to NETNAME dir */
 193                                 do_chroot = true;
 194                                 break;
 195
 196                         case 'U':                               /* setuid to USER */
 197                                 switchuser = optarg;
 198                                 break;
 199
 200                         case 1:                                 /* show help */
 201                                 show_help = true;
 202                                 break;
 203
 204                         case 2:                                 /* show version */
 205                                 show_version = true;
 206                                 break;
 207
 208                         case 3:                                 /* bypass security */
 209                                 bypass_security = true;
 210                                 break;
 211
 212                         case 4:                                 /* write log entries to a file */
 213                                 use_logfile = true;
 214                                 if(optarg)
 215                                         logfilename = xstrdup(optarg);
 216                                 break;
 217
 218                         case 5:                                 /* open control socket here */
 219                                 pidfilename = xstrdup(optarg);
 220                                 break;
 221
 222                         case '?':
 223                                 usage(true);
 224                                 return false;
 225
 226                         default:
 227                                 break;
 228                 }
 229         }
 230
 231         return true;
 232 }
 233
 234 /*
 235   Set all files and paths according to netname
 236 */
 237 static void make_names(void) {
 238 #ifdef HAVE_MINGW
 239         HKEY key;
 240         char installdir[1024] = "";
 241         long len = sizeof installdir;
 242 #endif
 243
 244         if(netname)
 245                 xasprintf(&identname, "tinc.%s", netname);
 246         else
 247                 identname = xstrdup("tinc");
 248
 249 #ifdef HAVE_MINGW
 250         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 251                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 252                         if(!logfilename)
 253                                 xasprintf(&logfilename, "%s/log/%s.log", identname);
 254                         if(!confbase) {
 255                                 if(netname)
 256                                         xasprintf(&confbase, "%s/%s", installdir, netname);
 257                                 else
 258                                         xasprintf(&confbase, "%s", installdir);
 259                         }
 260                         if(!pidfilename)
 261                                 xasprintf(&pidfilename, "%s/pid", confbase);
 262                 }
 263                 RegCloseKey(key);
 264                 if(*installdir)
 265                         return;
 266         }
 267 #endif
 268
 269         if(!logfilename)
 270                 xasprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 271
 272         if(!pidfilename)
 273                 xasprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
 274
 275         if(netname) {
 276                 if(!confbase)
 277                         xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
 278                 else
 279                         logger(LOG_INFO, "Both netname and configuration directory given, using the latter...");
 280         } else {
 281                 if(!confbase)
 282                         xasprintf(&confbase, CONFDIR "/tinc");
 283         }
 284 }
 285
 286 static void free_names(void) {
 287         if (identname) free(identname);
 288         if (netname) free(netname);
 289         if (pidfilename) free(pidfilename);
 290         if (logfilename) free(logfilename);
 291         if (confbase) free(confbase);
 292 }
 293
 294 static bool drop_privs(void) {
 295 #ifdef HAVE_MINGW
 296         if (switchuser) {
 297                 logger(LOG_ERR, "%s not supported on this platform", "-U");
 298                 return false;
 299         }
 300         if (do_chroot) {
 301                 logger(LOG_ERR, "%s not supported on this platform", "-R");
 302                 return false;
 303         }
 304 #else
 305         uid_t uid = 0;
 306         if (switchuser) {
 307                 struct passwd *pw = getpwnam(switchuser);
 308                 if (!pw) {
 309                         logger(LOG_ERR, "unknown user `%s'", switchuser);
 310                         return false;
 311                 }
 312                 uid = pw->pw_uid;
 313                 if (initgroups(switchuser, pw->pw_gid) != 0 ||
 314                     setgid(pw->pw_gid) != 0) {
 315                         logger(LOG_ERR, "System call `%s' failed: %s",
 316                                "initgroups", strerror(errno));
 317                         return false;
 318                 }
 319                 endgrent();
 320                 endpwent();
 321         }
 322         if (do_chroot) {
 323                 tzset();        /* for proper timestamps in logs */
 324                 if (chroot(confbase) != 0 || chdir("/") != 0) {
 325                         logger(LOG_ERR, "System call `%s' failed: %s",
 326                                "chroot", strerror(errno));
 327                         return false;
 328                 }
 329                 free(confbase);
 330                 confbase = xstrdup("");
 331         }
 332         if (switchuser)
 333                 if (setuid(uid) != 0) {
 334                         logger(LOG_ERR, "System call `%s' failed: %s",
 335                                "setuid", strerror(errno));
 336                         return false;
 337                 }
 338 #endif
 339         return true;
 340 }
 341
 342 #ifdef HAVE_MINGW
 343 # define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
 344 #else
 345 # define NORMAL_PRIORITY_CLASS 0
 346 # define BELOW_NORMAL_PRIORITY_CLASS 10
 347 # define HIGH_PRIORITY_CLASS -10
 348 # define setpriority(level) (setpriority(PRIO_PROCESS, 0, (level)))
 349 #endif
 350
 351 int main(int argc, char **argv) {
 352         program_name = argv[0];
 353
 354         if(!parse_options(argc, argv))
 355                 return 1;
 356
 357         make_names();
 358
 359         if(show_version) {
 360                 printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
 361                            VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
 362                 printf("Copyright (C) 1998-2011 Ivo Timmermans, Guus Sliepen and others.\n"
 363                                 "See the AUTHORS file for a complete list.\n\n"
 364                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 365                                 "and you are welcome to redistribute it under certain conditions;\n"
 366                                 "see the file COPYING for details.\n");
 367
 368                 return 0;
 369         }
 370
 371         if(show_help) {
 372                 usage(false);
 373                 return 0;
 374         }
 375
 376 #ifdef HAVE_MINGW
 377         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 378                 logger(LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 379                 return 1;
 380         }
 381 #endif
 382
 383         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 384
 385         if(!event_init()) {
 386                 logger(LOG_ERR, "Error initializing libevent!");
 387                 return 1;
 388         }
 389
 390         g_argv = argv;
 391
 392         init_configuration(&config_tree);
 393
 394         /* Slllluuuuuuurrrrp! */
 395
 396         srand(time(NULL));
 397         crypto_init();
 398
 399         if(!read_server_config())
 400                 return 1;
 401
 402 #ifdef HAVE_LZO
 403         if(lzo_init() != LZO_E_OK) {
 404                 logger(LOG_ERR, "Error initializing LZO compressor!");
 405                 return 1;
 406         }
 407 #endif
 408
 409 #ifdef HAVE_MINGW
 410         if(!do_detach || !init_service())
 411                 return main2(argc, argv);
 412         else
 413                 return 1;
 414 }
 415
 416 int main2(int argc, char **argv) {
 417         InitializeCriticalSection(&mutex);
 418         EnterCriticalSection(&mutex);
 419 #endif
 420         char *priority = NULL;
 421
 422         if(!detach())
 423                 return 1;
 424
 425 #ifdef HAVE_MLOCKALL
 426         /* Lock all pages into memory if requested.
 427          * This has to be done after daemon()/fork() so it works for child.
 428          * No need to do that in parent as it's very short-lived. */
 429         if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
 430                 logger(LOG_ERR, "System call `%s' failed: %s", "mlockall",
 431                    strerror(errno));
 432                 return 1;
 433         }
 434 #endif
 435
 436         /* Setup sockets and open device. */
 437
 438         if(!setup_network())
 439                 goto end_nonet;
 440
 441         if(!init_control())
 442                 goto end_nonet;
 443
 444         /* Initiate all outgoing connections. */
 445
 446         try_outgoing_connections();
 447
 448         /* Change process priority */
 449
 450         if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
 451                 if(!strcasecmp(priority, "Normal")) {
 452                         if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
 453                                 logger(LOG_ERR, "System call `%s' failed: %s",
 454                                        "setpriority", strerror(errno));
 455                                 goto end;
 456                         }
 457                 } else if(!strcasecmp(priority, "Low")) {
 458                         if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
 459                                        logger(LOG_ERR, "System call `%s' failed: %s",
 460                                        "setpriority", strerror(errno));
 461                                 goto end;
 462                         }
 463                 } else if(!strcasecmp(priority, "High")) {
 464                         if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
 465                                 logger(LOG_ERR, "System call `%s' failed: %s",
 466                                        "setpriority", strerror(errno));
 467                                 goto end;
 468                         }
 469                 } else {
 470                         logger(LOG_ERR, "Invalid priority `%s`!", priority);
 471                         goto end;
 472                 }
 473         }
 474
 475         /* drop privileges */
 476         if (!drop_privs())
 477                 goto end;
 478
 479         /* Start main loop. It only exits when tinc is killed. */
 480
 481         status = main_loop();
 482
 483         /* Shutdown properly. */
 484
 485         ifdebug(CONNECTIONS)
 486                 devops.dump_stats();
 487
 488         close_network_connections();
 489
 490 end:
 491         exit_control();
 492
 493 end_nonet:
 494         logger(LOG_NOTICE, "Terminating");
 495
 496         free(priority);
 497
 498         crypto_exit();
 499
 500         exit_configuration(&config_tree);
 501         free(cmdline_conf);
 502         free_names();
 503
 504         return status;
 505 }