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 && (!*netname || !strcmp(netname, "."))) {
 235                 free(netname);
 236                 netname = NULL;
 237         }
 238
 239         if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
 240                 fprintf(stderr, "Invalid character in netname!\n");
 241                 return false;
 242         }
 243
 244         return true;
 245 }
 246
 247 /*
 248   Set all files and paths according to netname
 249 */
 250 static void make_names(void) {
 251 #ifdef HAVE_MINGW
 252         HKEY key;
 253         char installdir[1024] = "";
 254         long len = sizeof installdir;
 255 #endif
 256
 257         if(netname)
 258                 xasprintf(&identname, "tinc.%s", netname);
 259         else
 260                 identname = xstrdup("tinc");
 261
 262 #ifdef HAVE_MINGW
 263         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 264                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 265                         if(!logfilename)
 266                                 xasprintf(&logfilename, "%s" SLASH "log" SLASH "%s.log", identname);
 267                         if(!confbase) {
 268                                 if(netname)
 269                                         xasprintf(&confbase, "%s" SLASH "%s", installdir, netname);
 270                                 else
 271                                         xasprintf(&confbase, "%s", installdir);
 272                         }
 273                         if(!pidfilename)
 274                                 xasprintf(&pidfilename, "%s" SLASH "pid", confbase);
 275                 }
 276                 RegCloseKey(key);
 277                 if(*installdir)
 278                         return;
 279         }
 280 #endif
 281
 282         if(!logfilename)
 283                 xasprintf(&logfilename, LOCALSTATEDIR SLASH "log" SLASH "%s.log", identname);
 284
 285         if(!pidfilename)
 286                 xasprintf(&pidfilename, LOCALSTATEDIR SLASH "run" SLASH "%s.pid", identname);
 287
 288         if(netname) {
 289                 if(!confbase)
 290                         xasprintf(&confbase, CONFDIR SLASH "tinc" SLASH "%s", netname);
 291                 else
 292                         logger(DEBUG_ALWAYS, LOG_INFO, "Both netname and configuration directory given, using the latter...");
 293         } else {
 294                 if(!confbase)
 295                         xasprintf(&confbase, CONFDIR SLASH "tinc");
 296         }
 297 }
 298
 299 static void free_names(void) {
 300         if (identname) free(identname);
 301         if (netname) free(netname);
 302         if (pidfilename) free(pidfilename);
 303         if (logfilename) free(logfilename);
 304         if (confbase) free(confbase);
 305 }
 306
 307 static bool drop_privs(void) {
 308 #ifdef HAVE_MINGW
 309         if (switchuser) {
 310                 logger(DEBUG_ALWAYS, LOG_ERR, "%s not supported on this platform", "-U");
 311                 return false;
 312         }
 313         if (do_chroot) {
 314                 logger(DEBUG_ALWAYS, LOG_ERR, "%s not supported on this platform", "-R");
 315                 return false;
 316         }
 317 #else
 318         uid_t uid = 0;
 319         if (switchuser) {
 320                 struct passwd *pw = getpwnam(switchuser);
 321                 if (!pw) {
 322                         logger(DEBUG_ALWAYS, LOG_ERR, "unknown user `%s'", switchuser);
 323                         return false;
 324                 }
 325                 uid = pw->pw_uid;
 326                 if (initgroups(switchuser, pw->pw_gid) != 0 ||
 327                     setgid(pw->pw_gid) != 0) {
 328                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 329                                "initgroups", strerror(errno));
 330                         return false;
 331                 }
 332 #ifndef __ANDROID__
 333 // Not supported in android NDK
 334                 endgrent();
 335                 endpwent();
 336 #endif
 337         }
 338         if (do_chroot) {
 339                 tzset();        /* for proper timestamps in logs */
 340                 if (chroot(confbase) != 0 || chdir("/") != 0) {
 341                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 342                                "chroot", strerror(errno));
 343                         return false;
 344                 }
 345                 free(confbase);
 346                 confbase = xstrdup("");
 347         }
 348         if (switchuser)
 349                 if (setuid(uid) != 0) {
 350                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 351                                "setuid", strerror(errno));
 352                         return false;
 353                 }
 354 #endif
 355         return true;
 356 }
 357
 358 #ifdef HAVE_MINGW
 359 # define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
 360 #else
 361 # define NORMAL_PRIORITY_CLASS 0
 362 # define BELOW_NORMAL_PRIORITY_CLASS 10
 363 # define HIGH_PRIORITY_CLASS -10
 364 # define setpriority(level) (setpriority(PRIO_PROCESS, 0, (level)))
 365 #endif
 366
 367 int main(int argc, char **argv) {
 368         program_name = argv[0];
 369
 370         if(!parse_options(argc, argv))
 371                 return 1;
 372
 373         make_names();
 374
 375         if(show_version) {
 376                 printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
 377                            VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
 378                 printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
 379                                 "See the AUTHORS file for a complete list.\n\n"
 380                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 381                                 "and you are welcome to redistribute it under certain conditions;\n"
 382                                 "see the file COPYING for details.\n");
 383
 384                 return 0;
 385         }
 386
 387         if(show_help) {
 388                 usage(false);
 389                 return 0;
 390         }
 391
 392 #ifdef HAVE_MINGW
 393         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 394                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 395                 return 1;
 396         }
 397 #endif
 398
 399         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 400
 401         g_argv = argv;
 402
 403         if(getenv("LISTEN_PID") && atoi(getenv("LISTEN_PID")) == getpid())
 404                 do_detach = false;
 405 #ifdef HAVE_UNSETENV
 406         unsetenv("LISTEN_PID");
 407 #endif
 408
 409         init_configuration(&config_tree);
 410
 411         /* Slllluuuuuuurrrrp! */
 412
 413         srand(time(NULL));
 414         crypto_init();
 415
 416         if(!read_server_config())
 417                 return 1;
 418
 419 #ifdef HAVE_LZO
 420         if(lzo_init() != LZO_E_OK) {
 421                 logger(DEBUG_ALWAYS, LOG_ERR, "Error initializing LZO compressor!");
 422                 return 1;
 423         }
 424 #endif
 425
 426 #ifdef HAVE_MINGW
 427         if(!do_detach || !init_service())
 428                 return main2(argc, argv);
 429         else
 430                 return 1;
 431 }
 432
 433 int main2(int argc, char **argv) {
 434         InitializeCriticalSection(&mutex);
 435         EnterCriticalSection(&mutex);
 436 #endif
 437         char *priority = NULL;
 438
 439         if(!detach())
 440                 return 1;
 441
 442 #ifdef HAVE_MLOCKALL
 443         /* Lock all pages into memory if requested.
 444          * This has to be done after daemon()/fork() so it works for child.
 445          * No need to do that in parent as it's very short-lived. */
 446         if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
 447                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "mlockall",
 448                    strerror(errno));
 449                 return 1;
 450         }
 451 #endif
 452
 453         if(!event_init()) {
 454                 logger(DEBUG_ALWAYS, LOG_ERR, "Error initializing libevent!");
 455                 return 1;
 456         }
 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",
 476                                        "setpriority", strerror(errno));
 477                                 goto end;
 478                         }
 479                 } else if(!strcasecmp(priority, "Low")) {
 480                         if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
 481                                        logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 482                                        "setpriority", strerror(errno));
 483                                 goto end;
 484                         }
 485                 } else if(!strcasecmp(priority, "High")) {
 486                         if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
 487                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
 488                                        "setpriority", strerror(errno));
 489                                 goto end;
 490                         }
 491                 } else {
 492                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid priority `%s`!", priority);
 493                         goto end;
 494                 }
 495         }
 496
 497         /* drop privileges */
 498         if (!drop_privs())
 499                 goto end;
 500
 501         /* Start main loop. It only exits when tinc is killed. */
 502
 503         status = main_loop();
 504
 505         /* Shutdown properly. */
 506
 507         if(debug_level >= DEBUG_CONNECTIONS)
 508                 devops.dump_stats();
 509
 510         close_network_connections();
 511
 512 end:
 513         exit_control();
 514
 515 end_nonet:
 516         logger(DEBUG_ALWAYS, LOG_NOTICE, "Terminating");
 517
 518         free(priority);
 519
 520         crypto_exit();
 521
 522         exit_configuration(&config_tree);
 523         free(cmdline_conf);
 524         free_names();
 525
 526         return status;
 527 }