src/tincd.c

   1 /*
   2     tincd.c -- the main file for tincd
   3     Copyright (C) 1998-2005 Ivo Timmermans
   4                   2000-2010 Guus Sliepen <guus@tinc-vpn.org>
   5                   2008      Max Rijevski <maksuf@gmail.com>
   6                   2009      Michael Tokarev <mjt@tls.msk.ru>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License along
  19     with this program; if not, write to the Free Software Foundation, Inc.,
  20     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21 */
  22
  23 #include "system.h"
  24
  25 /* Darwin (MacOS/X) needs the following definition... */
  26 #ifndef _P1003_1B_VISIBLE
  27 #define _P1003_1B_VISIBLE
  28 #endif
  29
  30 #ifdef HAVE_SYS_MMAN_H
  31 #include <sys/mman.h>
  32 #endif
  33
  34 #include <openssl/rand.h>
  35 #include <openssl/rsa.h>
  36 #include <openssl/pem.h>
  37 #include <openssl/evp.h>
  38 #include <openssl/engine.h>
  39
  40 #ifdef HAVE_LZO
  41 #include LZO1X_H
  42 #endif
  43
  44 #ifndef HAVE_MINGW
  45 #include <pwd.h>
  46 #include <grp.h>
  47 #include <time.h>
  48 #endif
  49
  50 #include <getopt.h>
  51
  52 #include "conf.h"
  53 #include "control.h"
  54 #include "crypto.h"
  55 #include "device.h"
  56 #include "logger.h"
  57 #include "net.h"
  58 #include "netutl.h"
  59 #include "process.h"
  60 #include "protocol.h"
  61 #include "utils.h"
  62 #include "xalloc.h"
  63
  64 /* The name this program was run with. */
  65 char *program_name = NULL;
  66
  67 /* If nonzero, display usage information and exit. */
  68 bool show_help = false;
  69
  70 /* If nonzero, print the version on standard output and exit.  */
  71 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 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 *identname = NULL;                         /* program name for syslog */
  89 char *logfilename = NULL;                       /* log file location */
  90 char *controlcookiename = NULL;
  91 char **g_argv;                                  /* a copy of the cmdline arguments */
  92
  93 static int status;
  94
  95 static struct option const long_options[] = {
  96         {"config", required_argument, NULL, 'c'},
  97         {"net", required_argument, NULL, 'n'},
  98         {"help", no_argument, NULL, 1},
  99         {"version", no_argument, NULL, 2},
 100         {"no-detach", no_argument, NULL, 'D'},
 101         {"debug", optional_argument, NULL, 'd'},
 102         {"bypass-security", no_argument, NULL, 3},
 103         {"mlock", no_argument, NULL, 'L'},
 104         {"chroot", no_argument, NULL, 'R'},
 105         {"user", required_argument, NULL, 'U'},
 106         {"logfile", optional_argument, NULL, 4},
 107         {"controlcookie", required_argument, NULL, 5},
 108         {NULL, 0, NULL, 0}
 109 };
 110
 111 #ifdef HAVE_MINGW
 112 static struct WSAData wsa_state;
 113 CRITICAL_SECTION mutex;
 114 #endif
 115
 116 static void usage(bool status) {
 117         if(status)
 118                 fprintf(stderr, "Try `%s --help\' for more information.\n",
 119                                 program_name);
 120         else {
 121                 printf("Usage: %s [option]...\n\n", program_name);
 122                 printf( "  -c, --config=DIR              Read configuration options from DIR.\n"
 123                                 "  -D, --no-detach               Don't fork and detach.\n"
 124                                 "  -d, --debug[=LEVEL]           Increase debug level or set it to LEVEL.\n"
 125                                 "  -n, --net=NETNAME             Connect to net NETNAME.\n"
 126                                 "  -L, --mlock                   Lock tinc into main memory.\n"
 127                                 "      --logfile[=FILENAME]      Write log entries to a logfile.\n"
 128                                 "      --controlcookie=FILENAME  Write control socket cookie to FILENAME.\n"
 129                                 "      --bypass-security         Disables meta protocol security, for debugging.\n"
 130                                 "  -R, --chroot                  chroot to NET dir at startup.\n"
 131                                 "  -U, --user=USER               setuid to given USER at startup.\n"                            "      --help                    Display this help and exit.\n"
 132                                 "      --version                 Output version information and exit.\n\n");
 133                 printf("Report bugs to tinc@tinc-vpn.org.\n");
 134         }
 135 }
 136
 137 static bool parse_options(int argc, char **argv) {
 138         int r;
 139         int option_index = 0;
 140
 141         while((r = getopt_long(argc, argv, "c:DLd::n:RU:", long_options, &option_index)) != EOF) {
 142                 switch (r) {
 143                         case 0:                         /* long option */
 144                                 break;
 145
 146                         case 'c':                               /* config file */
 147                                 confbase = xstrdup(optarg);
 148                                 break;
 149
 150                         case 'D':                               /* no detach */
 151                                 do_detach = false;
 152                                 break;
 153
 154                         case 'L':                               /* no detach */
 155 #ifndef HAVE_MLOCKALL
 156                                 logger(LOG_ERR, "%s not supported on this platform", "mlockall()");
 157                                 return false;
 158 #else
 159                                 do_mlock = true;
 160                                 break;
 161 #endif
 162
 163                         case 'd':                               /* inc debug level */
 164                                 if(optarg)
 165                                         debug_level = atoi(optarg);
 166                                 else
 167                                         debug_level++;
 168                                 break;
 169
 170                         case 'n':                               /* net name given */
 171                                 netname = xstrdup(optarg);
 172                                 break;
 173
 174                         case 'R':                               /* chroot to NETNAME dir */
 175                                 do_chroot = true;
 176                                 break;
 177
 178                         case 'U':                               /* setuid to USER */
 179                                 switchuser = optarg;
 180                                 break;
 181
 182                         case 1:                                 /* show help */
 183                                 show_help = true;
 184                                 break;
 185
 186                         case 2:                                 /* show version */
 187                                 show_version = true;
 188                                 break;
 189
 190                         case 3:                                 /* bypass security */
 191                                 bypass_security = true;
 192                                 break;
 193
 194                         case 4:                                 /* write log entries to a file */
 195                                 use_logfile = true;
 196                                 if(optarg)
 197                                         logfilename = xstrdup(optarg);
 198                                 break;
 199
 200                         case 5:                                 /* open control socket here */
 201                                 controlcookiename = xstrdup(optarg);
 202                                 break;
 203
 204                         case '?':
 205                                 usage(true);
 206                                 return false;
 207
 208                         default:
 209                                 break;
 210                 }
 211         }
 212
 213         return true;
 214 }
 215
 216 /*
 217   Set all files and paths according to netname
 218 */
 219 static void make_names(void) {
 220 #ifdef HAVE_MINGW
 221         HKEY key;
 222         char installdir[1024] = "";
 223         long len = sizeof installdir;
 224 #endif
 225
 226         if(netname)
 227                 xasprintf(&identname, "tinc.%s", netname);
 228         else
 229                 identname = xstrdup("tinc");
 230
 231 #ifdef HAVE_MINGW
 232         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 233                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 234                         if(!logfilename)
 235                                 xasprintf(&logfilename, "%s/log/%s.log", identname);
 236                         if(!confbase) {
 237                                 if(netname)
 238                                         xasprintf(&confbase, "%s/%s", installdir, netname);
 239                                 else
 240                                         xasprintf(&confbase, "%s", installdir);
 241                         }
 242                         if(!controlcookiename)
 243                                 xasprintf(&controlcookiename, "%s/cookie", confbase);
 244                 }
 245                 RegCloseKey(key);
 246                 if(*installdir)
 247                         return;
 248         }
 249 #endif
 250
 251         if(!logfilename)
 252                 xasprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 253
 254         if(!controlcookiename)
 255                 xasprintf(&controlcookiename, LOCALSTATEDIR "/run/%s.cookie", identname);
 256
 257         if(netname) {
 258                 if(!confbase)
 259                         xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
 260                 else
 261                         logger(LOG_INFO, "Both netname and configuration directory given, using the latter...");
 262         } else {
 263                 if(!confbase)
 264                         xasprintf(&confbase, CONFDIR "/tinc");
 265         }
 266 }
 267
 268 static void free_names() {
 269         if (identname) free(identname);
 270         if (netname) free(netname);
 271         if (controlcookiename) free(controlcookiename);
 272         if (logfilename) free(logfilename);
 273         if (confbase) free(confbase);
 274 }
 275
 276 static bool drop_privs() {
 277 #ifdef HAVE_MINGW
 278         if (switchuser) {
 279                 logger(LOG_ERR, "%s not supported on this platform", "-U");
 280                 return false;
 281         }
 282         if (do_chroot) {
 283                 logger(LOG_ERR, "%s not supported on this platform", "-R");
 284                 return false;
 285         }
 286 #else
 287         uid_t uid = 0;
 288         if (switchuser) {
 289                 struct passwd *pw = getpwnam(switchuser);
 290                 if (!pw) {
 291                         logger(LOG_ERR, "unknown user `%s'", switchuser);
 292                         return false;
 293                 }
 294                 uid = pw->pw_uid;
 295                 if (initgroups(switchuser, pw->pw_gid) != 0 ||
 296                     setgid(pw->pw_gid) != 0) {
 297                         logger(LOG_ERR, "System call `%s' failed: %s",
 298                                "initgroups", strerror(errno));
 299                         return false;
 300                 }
 301                 endgrent();
 302                 endpwent();
 303         }
 304         if (do_chroot) {
 305                 tzset();        /* for proper timestamps in logs */
 306                 if (chroot(confbase) != 0 || chdir("/") != 0) {
 307                         logger(LOG_ERR, "System call `%s' failed: %s",
 308                                "chroot", strerror(errno));
 309                         return false;
 310                 }
 311                 free(confbase);
 312                 confbase = xstrdup("");
 313         }
 314         if (switchuser)
 315                 if (setuid(uid) != 0) {
 316                         logger(LOG_ERR, "System call `%s' failed: %s",
 317                                "setuid", strerror(errno));
 318                         return false;
 319                 }
 320 #endif
 321         return true;
 322 }
 323
 324 #ifdef HAVE_MINGW
 325 # define setpriority(level) SetPriorityClass(GetCurrentProcess(), level)
 326 #else
 327 # define NORMAL_PRIORITY_CLASS 0
 328 # define BELOW_NORMAL_PRIORITY_CLASS 10
 329 # define HIGH_PRIORITY_CLASS -10
 330 # define setpriority(level) nice(level)
 331 #endif
 332
 333 int main(int argc, char **argv) {
 334         program_name = argv[0];
 335
 336         if(!parse_options(argc, argv))
 337                 return 1;
 338
 339         make_names();
 340
 341         if(show_version) {
 342                 printf("%s version %s (built %s %s, protocol %d)\n", PACKAGE,
 343                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 344                 printf("Copyright (C) 1998-2010 Ivo Timmermans, Guus Sliepen and others.\n"
 345                                 "See the AUTHORS file for a complete list.\n\n"
 346                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 347                                 "and you are welcome to redistribute it under certain conditions;\n"
 348                                 "see the file COPYING for details.\n");
 349
 350                 return 0;
 351         }
 352
 353         if(show_help) {
 354                 usage(false);
 355                 return 0;
 356         }
 357
 358 #ifdef HAVE_MINGW
 359         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 360                 logger(LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 361                 return 1;
 362         }
 363 #endif
 364
 365         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 366
 367         if(!event_init()) {
 368                 logger(LOG_ERR, "Error initializing libevent!");
 369                 return 1;
 370         }
 371
 372         g_argv = argv;
 373
 374         init_configuration(&config_tree);
 375
 376         /* Slllluuuuuuurrrrp! */
 377
 378         srand(time(NULL));
 379         crypto_init();
 380
 381         if(!read_server_config())
 382                 return 1;
 383
 384 #ifdef HAVE_LZO
 385         if(lzo_init() != LZO_E_OK) {
 386                 logger(LOG_ERR, "Error initializing LZO compressor!");
 387                 return 1;
 388         }
 389 #endif
 390
 391 #ifdef HAVE_MINGW
 392         if(!do_detach || !init_service())
 393                 return main2(argc, argv);
 394         else
 395                 return 1;
 396 }
 397
 398 int main2(int argc, char **argv) {
 399         InitializeCriticalSection(&mutex);
 400         EnterCriticalSection(&mutex);
 401 #endif
 402
 403         if(!detach())
 404                 return 1;
 405
 406 #ifdef HAVE_MLOCKALL
 407         /* Lock all pages into memory if requested.
 408          * This has to be done after daemon()/fork() so it works for child.
 409          * No need to do that in parent as it's very short-lived. */
 410         if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
 411                 logger(LOG_ERR, "System call `%s' failed: %s", "mlockall",
 412                    strerror(errno));
 413                 return 1;
 414         }
 415 #endif
 416
 417         /* Setup sockets and open device. */
 418
 419         if(!setup_network())
 420                 goto end;
 421
 422         if(!init_control())
 423                 return 1;
 424
 425         /* Initiate all outgoing connections. */
 426
 427         try_outgoing_connections();
 428
 429         /* Change process priority */
 430
 431         char *priority = 0;
 432
 433         if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
 434                 if(!strcasecmp(priority, "Normal"))
 435                         setpriority(NORMAL_PRIORITY_CLASS);
 436                 else if(!strcasecmp(priority, "Low"))
 437                         setpriority(BELOW_NORMAL_PRIORITY_CLASS);
 438                 else if(!strcasecmp(priority, "High"))
 439                         setpriority(HIGH_PRIORITY_CLASS);
 440                 else {
 441                         logger(LOG_ERR, "Invalid priority `%s`!", priority);
 442                         goto end;
 443                 }
 444         }
 445
 446         /* drop privileges */
 447         if (!drop_privs())
 448                 goto end;
 449
 450         /* Start main loop. It only exits when tinc is killed. */
 451
 452         status = main_loop();
 453
 454         /* Shutdown properly. */
 455
 456         ifdebug(CONNECTIONS)
 457                 dump_device_stats();
 458
 459         close_network_connections();
 460
 461 end:
 462         logger(LOG_NOTICE, "Terminating");
 463
 464         exit_control();
 465
 466         crypto_exit();
 467
 468         exit_configuration(&config_tree);
 469         free_names();
 470
 471         return status;
 472 }