git.meshlink.io Git - meshlink/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 *controlcookiename = NULL;
  93 char **g_argv;                                  /* a copy of the cmdline arguments */
  94
  95 static int status;
  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         {"controlcookie", required_argument, NULL, 5},
 110         {NULL, 0, NULL, 0}
 111 };
 112
 113 #ifdef HAVE_MINGW
 114 static struct WSAData wsa_state;
 115 CRITICAL_SECTION mutex;
 116 int main2(int argc, char **argv);
 117 #endif
 118
 119 static void usage(bool status) {
 120         if(status)
 121                 fprintf(stderr, "Try `%s --help\' for more information.\n",
 122                                 program_name);
 123         else {
 124                 printf("Usage: %s [option]...\n\n", program_name);
 125                 printf( "  -c, --config=DIR              Read configuration options from DIR.\n"
 126                                 "  -D, --no-detach               Don't fork and detach.\n"
 127                                 "  -d, --debug[=LEVEL]           Increase debug level or set it to LEVEL.\n"
 128                                 "  -n, --net=NETNAME             Connect to net NETNAME.\n"
 129                                 "  -L, --mlock                   Lock tinc into main memory.\n"
 130                                 "      --logfile[=FILENAME]      Write log entries to a logfile.\n"
 131                                 "      --controlcookie=FILENAME  Write control socket cookie to FILENAME.\n"
 132                                 "      --bypass-security         Disables meta protocol security, for debugging.\n"
 133                                 "  -o [HOST.]KEY=VALUE           Set global/host configuration value.\n"
 134                                 "  -R, --chroot                  chroot to NET dir at startup.\n"
 135                                 "  -U, --user=USER               setuid to given USER at startup.\n"                            "      --help                    Display this help and exit.\n"
 136                                 "      --version                 Output version information and exit.\n\n");
 137                 printf("Report bugs to tinc@tinc-vpn.org.\n");
 138         }
 139 }
 140
 141 static bool parse_options(int argc, char **argv) {
 142         config_t *cfg;
 143         int r;
 144         int option_index = 0;
 145         int lineno = 0;
 146
 147         cmdline_conf = list_alloc((list_action_t)free_config);
 148
 149         while((r = getopt_long(argc, argv, "c:DLd::n:o:RU:", long_options, &option_index)) != EOF) {
 150                 switch (r) {
 151                         case 0:                         /* long option */
 152                                 break;
 153
 154                         case 'c':                               /* config file */
 155                                 confbase = xstrdup(optarg);
 156                                 break;
 157
 158                         case 'D':                               /* no detach */
 159                                 do_detach = false;
 160                                 break;
 161
 162                         case 'L':                               /* no detach */
 163 #ifndef HAVE_MLOCKALL
 164                                 logger(LOG_ERR, "%s not supported on this platform", "mlockall()");
 165                                 return false;
 166 #else
 167                                 do_mlock = true;
 168                                 break;
 169 #endif
 170
 171                         case 'd':                               /* inc debug level */
 172                                 if(optarg)
 173                                         debug_level = atoi(optarg);
 174                                 else
 175                                         debug_level++;
 176                                 break;
 177
 178                         case 'n':                               /* net name given */
 179                                 /* netname "." is special: a "top-level name" */
 180                                 netname = strcmp(optarg, ".") != 0 ?
 181                                                 xstrdup(optarg) : NULL;
 182                                 break;
 183
 184                         case 'o':                               /* option */
 185                                 cfg = parse_config_line(optarg, NULL, ++lineno);
 186                                 if (!cfg)
 187                                         return false;
 188                                 list_insert_tail(cmdline_conf, cfg);
 189                                 break;
 190
 191                         case 'R':                               /* chroot to NETNAME dir */
 192                                 do_chroot = true;
 193                                 break;
 194
 195                         case 'U':                               /* setuid to USER */
 196                                 switchuser = optarg;
 197                                 break;
 198
 199                         case 1:                                 /* show help */
 200                                 show_help = true;
 201                                 break;
 202
 203                         case 2:                                 /* show version */
 204                                 show_version = true;
 205                                 break;
 206
 207                         case 3:                                 /* bypass security */
 208                                 bypass_security = true;
 209                                 break;
 210
 211                         case 4:                                 /* write log entries to a file */
 212                                 use_logfile = true;
 213                                 if(optarg)
 214                                         logfilename = xstrdup(optarg);
 215                                 break;
 216
 217                         case 5:                                 /* open control socket here */
 218                                 controlcookiename = xstrdup(optarg);
 219                                 break;
 220
 221                         case '?':
 222                                 usage(true);
 223                                 return false;
 224
 225                         default:
 226                                 break;
 227                 }
 228         }
 229
 230         return true;
 231 }
 232
 233 /*
 234   Set all files and paths according to netname
 235 */
 236 static void make_names(void) {
 237 #ifdef HAVE_MINGW
 238         HKEY key;
 239         char installdir[1024] = "";
 240         long len = sizeof installdir;
 241 #endif
 242
 243         if(netname)
 244                 xasprintf(&identname, "tinc.%s", netname);
 245         else
 246                 identname = xstrdup("tinc");
 247
 248 #ifdef HAVE_MINGW
 249         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 250                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 251                         if(!logfilename)
 252                                 xasprintf(&logfilename, "%s/log/%s.log", identname);
 253                         if(!confbase) {
 254                                 if(netname)
 255                                         xasprintf(&confbase, "%s/%s", installdir, netname);
 256                                 else
 257                                         xasprintf(&confbase, "%s", installdir);
 258                         }
 259                         if(!controlcookiename)
 260                                 xasprintf(&controlcookiename, "%s/cookie", confbase);
 261                 }
 262                 RegCloseKey(key);
 263                 if(*installdir)
 264                         return;
 265         }
 266 #endif
 267
 268         if(!logfilename)
 269                 xasprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 270
 271         if(!controlcookiename)
 272                 xasprintf(&controlcookiename, LOCALSTATEDIR "/run/%s.cookie", identname);
 273
 274         if(netname) {
 275                 if(!confbase)
 276                         xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
 277                 else
 278                         logger(LOG_INFO, "Both netname and configuration directory given, using the latter...");
 279         } else {
 280                 if(!confbase)
 281                         xasprintf(&confbase, CONFDIR "/tinc");
 282         }
 283 }
 284
 285 static void free_names(void) {
 286         if (identname) free(identname);
 287         if (netname) free(netname);
 288         if (controlcookiename) free(controlcookiename);
 289         if (logfilename) free(logfilename);
 290         if (confbase) free(confbase);
 291 }
 292
 293 static bool drop_privs(void) {
 294 #ifdef HAVE_MINGW
 295         if (switchuser) {
 296                 logger(LOG_ERR, "%s not supported on this platform", "-U");
 297                 return false;
 298         }
 299         if (do_chroot) {
 300                 logger(LOG_ERR, "%s not supported on this platform", "-R");
 301                 return false;
 302         }
 303 #else
 304         uid_t uid = 0;
 305         if (switchuser) {
 306                 struct passwd *pw = getpwnam(switchuser);
 307                 if (!pw) {
 308                         logger(LOG_ERR, "unknown user `%s'", switchuser);
 309                         return false;
 310                 }
 311                 uid = pw->pw_uid;
 312                 if (initgroups(switchuser, pw->pw_gid) != 0 ||
 313                     setgid(pw->pw_gid) != 0) {
 314                         logger(LOG_ERR, "System call `%s' failed: %s",
 315                                "initgroups", strerror(errno));
 316                         return false;
 317                 }
 318                 endgrent();
 319                 endpwent();
 320         }
 321         if (do_chroot) {
 322                 tzset();        /* for proper timestamps in logs */
 323                 if (chroot(confbase) != 0 || chdir("/") != 0) {
 324                         logger(LOG_ERR, "System call `%s' failed: %s",
 325                                "chroot", strerror(errno));
 326                         return false;
 327                 }
 328                 free(confbase);
 329                 confbase = xstrdup("");
 330         }
 331         if (switchuser)
 332                 if (setuid(uid) != 0) {
 333                         logger(LOG_ERR, "System call `%s' failed: %s",
 334                                "setuid", strerror(errno));
 335                         return false;
 336                 }
 337 #endif
 338         return true;
 339 }
 340
 341 #ifdef HAVE_MINGW
 342 # define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
 343 #else
 344 # define NORMAL_PRIORITY_CLASS 0
 345 # define BELOW_NORMAL_PRIORITY_CLASS 10
 346 # define HIGH_PRIORITY_CLASS -10
 347 # define setpriority(level) (setpriority(PRIO_PROCESS, 0, (level)))
 348 #endif
 349
 350 int main(int argc, char **argv) {
 351         program_name = argv[0];
 352
 353         if(!parse_options(argc, argv))
 354                 return 1;
 355
 356         make_names();
 357
 358         if(show_version) {
 359                 printf("%s version %s (built %s %s, protocol %d)\n", PACKAGE,
 360                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 361                 printf("Copyright (C) 1998-2011 Ivo Timmermans, Guus Sliepen and others.\n"
 362                                 "See the AUTHORS file for a complete list.\n\n"
 363                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 364                                 "and you are welcome to redistribute it under certain conditions;\n"
 365                                 "see the file COPYING for details.\n");
 366
 367                 return 0;
 368         }
 369
 370         if(show_help) {
 371                 usage(false);
 372                 return 0;
 373         }
 374
 375 #ifdef HAVE_MINGW
 376         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 377                 logger(LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 378                 return 1;
 379         }
 380 #endif
 381
 382         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 383
 384         if(!event_init()) {
 385                 logger(LOG_ERR, "Error initializing libevent!");
 386                 return 1;
 387         }
 388
 389         g_argv = argv;
 390
 391         init_configuration(&config_tree);
 392
 393         /* Slllluuuuuuurrrrp! */
 394
 395         srand(time(NULL));
 396         crypto_init();
 397
 398         if(!read_server_config())
 399                 return 1;
 400
 401 #ifdef HAVE_LZO
 402         if(lzo_init() != LZO_E_OK) {
 403                 logger(LOG_ERR, "Error initializing LZO compressor!");
 404                 return 1;
 405         }
 406 #endif
 407
 408 #ifdef HAVE_MINGW
 409         if(!do_detach || !init_service())
 410                 return main2(argc, argv);
 411         else
 412                 return 1;
 413 }
 414
 415 int main2(int argc, char **argv) {
 416         InitializeCriticalSection(&mutex);
 417         EnterCriticalSection(&mutex);
 418 #endif
 419
 420         if(!detach())
 421                 return 1;
 422
 423 #ifdef HAVE_MLOCKALL
 424         /* Lock all pages into memory if requested.
 425          * This has to be done after daemon()/fork() so it works for child.
 426          * No need to do that in parent as it's very short-lived. */
 427         if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
 428                 logger(LOG_ERR, "System call `%s' failed: %s", "mlockall",
 429                    strerror(errno));
 430                 return 1;
 431         }
 432 #endif
 433
 434         /* Setup sockets and open device. */
 435
 436         if(!setup_network())
 437                 goto end;
 438
 439         if(!init_control())
 440                 return 1;
 441
 442         /* Initiate all outgoing connections. */
 443
 444         try_outgoing_connections();
 445
 446         /* Change process priority */
 447
 448         char *priority = NULL;
 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                 dump_device_stats();
 487
 488         close_network_connections();
 489
 490 end:
 491         logger(LOG_NOTICE, "Terminating");
 492
 493         exit_control();
 494
 495         crypto_exit();
 496
 497         exit_configuration(&config_tree);
 498         free_names();
 499
 500         return status;
 501 }