www.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                   2000-2018 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 #ifdef HAVE_GETOPT_LONG
  53 #include <getopt.h>
  54 #else
  55 #include "getopt.h"
  56 #endif
  57
  58 #include "pidfile.h"
  59
  60 #include "conf.h"
  61 #include "device.h"
  62 #include "logger.h"
  63 #include "net.h"
  64 #include "netutl.h"
  65 #include "process.h"
  66 #include "protocol.h"
  67 #include "utils.h"
  68 #include "xalloc.h"
  69
  70 /* The name this program was run with. */
  71 char *program_name = NULL;
  72
  73 /* If nonzero, display usage information and exit. */
  74 bool show_help = false;
  75
  76 /* If nonzero, print the version on standard output and exit.  */
  77 bool show_version = false;
  78
  79 /* If nonzero, it will attempt to kill a running tincd and exit. */
  80 int kill_tincd = 0;
  81
  82 /* If nonzero, generate public/private keypair for this host/net. */
  83 int generate_keys = 0;
  84
  85 /* If nonzero, use null ciphers and skip all key exchanges. */
  86 bool bypass_security = false;
  87
  88 /* If nonzero, disable swapping for this process. */
  89 bool do_mlock = false;
  90
  91 /* If nonzero, chroot to netdir after startup. */
  92 static bool do_chroot = false;
  93
  94 /* If !NULL, do setuid to given user after startup */
  95 static const char *switchuser = NULL;
  96
  97 /* If nonzero, write log entries to a separate file. */
  98 bool use_logfile = false;
  99
 100 char *identname = NULL;                         /* program name for syslog */
 101 char *pidfilename = NULL;                       /* pid file location */
 102 char *logfilename = NULL;                       /* log file location */
 103 char **g_argv;                                  /* a copy of the cmdline arguments */
 104
 105 static int status = 1;
 106
 107 static struct option const long_options[] = {
 108         {"config", required_argument, NULL, 'c'},
 109         {"kill", optional_argument, NULL, 'k'},
 110         {"net", required_argument, NULL, 'n'},
 111         {"help", no_argument, NULL, 1},
 112         {"version", no_argument, NULL, 2},
 113         {"no-detach", no_argument, NULL, 'D'},
 114         {"generate-keys", optional_argument, NULL, 'K'},
 115         {"debug", optional_argument, NULL, 'd'},
 116         {"bypass-security", no_argument, NULL, 3},
 117         {"mlock", no_argument, NULL, 'L'},
 118         {"chroot", no_argument, NULL, 'R'},
 119         {"user", required_argument, NULL, 'U'},
 120         {"logfile", optional_argument, NULL, 4},
 121         {"pidfile", required_argument, NULL, 5},
 122         {"option", required_argument, NULL, 'o'},
 123         {NULL, 0, NULL, 0}
 124 };
 125
 126 #ifdef HAVE_MINGW
 127 static struct WSAData wsa_state;
 128 CRITICAL_SECTION mutex;
 129 int main2(int argc, char **argv);
 130 #endif
 131
 132 static void usage(bool status) {
 133         if(status)
 134                 fprintf(stderr, "Try `%s --help\' for more information.\n",
 135                         program_name);
 136         else {
 137                 printf("Usage: %s [option]...\n\n", program_name);
 138                 printf("  -c, --config=DIR               Read configuration options from DIR.\n"
 139                        "  -D, --no-detach                Don't fork and detach.\n"
 140                        "  -d, --debug[=LEVEL]            Increase debug level or set it to LEVEL.\n"
 141                        "  -k, --kill[=SIGNAL]            Attempt to kill a running tincd and exit.\n"
 142                        "  -n, --net=NETNAME              Connect to net NETNAME.\n"
 143                        "  -K, --generate-keys[=BITS]     Generate public/private RSA keypair.\n"
 144                        "  -L, --mlock                    Lock tinc into main memory.\n"
 145                        "      --logfile[=FILENAME]       Write log entries to a logfile.\n"
 146                        "      --pidfile=FILENAME         Write PID to FILENAME.\n"
 147                        "  -o, --option=[HOST.]KEY=VALUE  Set global/host configuration value.\n"
 148                        "  -R, --chroot                   chroot to NET dir at startup.\n"
 149                        "  -U, --user=USER                setuid to given USER at startup.\n"
 150                        "      --help                     Display this help and exit.\n"
 151                        "      --version                  Output version information and exit.\n\n");
 152                 printf("Report bugs to tinc@tinc-vpn.org.\n");
 153         }
 154 }
 155
 156 static bool parse_options(int argc, char **argv) {
 157         config_t *cfg;
 158         int r;
 159         int option_index = 0;
 160         int lineno = 0;
 161
 162         cmdline_conf = list_alloc((list_action_t)free_config);
 163
 164         while((r = getopt_long(argc, argv, "c:DLd::k::n:o:K::RU:", long_options, &option_index)) != EOF) {
 165                 switch(r) {
 166                 case 0:                         /* long option */
 167                         break;
 168
 169                 case 'c':                               /* config file */
 170                         if(confbase) {
 171                                 fprintf(stderr, "Only one configuration directory can be given.\n");
 172                                 usage(true);
 173                                 return false;
 174                         }
 175
 176                         confbase = xstrdup(optarg);
 177                         break;
 178
 179                 case 'D':                               /* no detach */
 180                         do_detach = false;
 181                         break;
 182
 183                 case 'L':                               /* no detach */
 184 #ifndef HAVE_MLOCKALL
 185                         logger(LOG_ERR, "%s not supported on this platform", "mlockall()");
 186                         return false;
 187 #else
 188                         do_mlock = true;
 189                         break;
 190 #endif
 191
 192                 case 'd':                               /* increase debug level */
 193                         if(!optarg && optind < argc && *argv[optind] != '-') {
 194                                 optarg = argv[optind++];
 195                         }
 196
 197                         if(optarg) {
 198                                 debug_level = atoi(optarg);
 199                         } else {
 200                                 debug_level++;
 201                         }
 202
 203                         break;
 204
 205                 case 'k':                               /* kill old tincds */
 206 #ifndef HAVE_MINGW
 207                         if(!optarg && optind < argc && *argv[optind] != '-') {
 208                                 optarg = argv[optind++];
 209                         }
 210
 211                         if(optarg) {
 212                                 if(!strcasecmp(optarg, "HUP")) {
 213                                         kill_tincd = SIGHUP;
 214                                 } else if(!strcasecmp(optarg, "TERM")) {
 215                                         kill_tincd = SIGTERM;
 216                                 } else if(!strcasecmp(optarg, "KILL")) {
 217                                         kill_tincd = SIGKILL;
 218                                 } else if(!strcasecmp(optarg, "USR1")) {
 219                                         kill_tincd = SIGUSR1;
 220                                 } else if(!strcasecmp(optarg, "USR2")) {
 221                                         kill_tincd = SIGUSR2;
 222                                 } else if(!strcasecmp(optarg, "WINCH")) {
 223                                         kill_tincd = SIGWINCH;
 224                                 } else if(!strcasecmp(optarg, "INT")) {
 225                                         kill_tincd = SIGINT;
 226                                 } else if(!strcasecmp(optarg, "ALRM")) {
 227                                         kill_tincd = SIGALRM;
 228                                 } else if(!strcasecmp(optarg, "ABRT")) {
 229                                         kill_tincd = SIGABRT;
 230                                 } else {
 231                                         kill_tincd = atoi(optarg);
 232
 233                                         if(!kill_tincd) {
 234                                                 fprintf(stderr, "Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n",
 235                                                         optarg);
 236                                                 usage(true);
 237                                                 return false;
 238                                         }
 239                                 }
 240                         } else {
 241                                 kill_tincd = SIGTERM;
 242                         }
 243
 244 #else
 245                         kill_tincd = 1;
 246 #endif
 247                         break;
 248
 249                 case 'n':                               /* net name given */
 250
 251                         /* netname "." is special: a "top-level name" */
 252                         if(netname) {
 253                                 fprintf(stderr, "Only one netname can be given.\n");
 254                                 usage(true);
 255                                 return false;
 256                         }
 257
 258                         if(optarg && strcmp(optarg, ".")) {
 259                                 netname = xstrdup(optarg);
 260                         }
 261
 262                         break;
 263
 264                 case 'o':                               /* option */
 265                         cfg = parse_config_line(optarg, NULL, ++lineno);
 266
 267                         if(!cfg) {
 268                                 return false;
 269                         }
 270
 271                         list_insert_tail(cmdline_conf, cfg);
 272                         break;
 273
 274                 case 'K':                               /* generate public/private keypair */
 275                         if(!optarg && optind < argc && *argv[optind] != '-') {
 276                                 optarg = argv[optind++];
 277                         }
 278
 279                         if(optarg) {
 280                                 generate_keys = atoi(optarg);
 281
 282                                 if(generate_keys < 512) {
 283                                         fprintf(stderr, "Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n",
 284                                                 optarg);
 285                                         usage(true);
 286                                         return false;
 287                                 }
 288
 289                                 generate_keys &= ~7;    /* Round it to bytes */
 290                         } else {
 291                                 generate_keys = 2048;
 292                         }
 293
 294                         break;
 295
 296                 case 'R':                               /* chroot to NETNAME dir */
 297                         do_chroot = true;
 298                         break;
 299
 300                 case 'U':                               /* setuid to USER */
 301                         switchuser = optarg;
 302                         break;
 303
 304                 case 1:                                 /* show help */
 305                         show_help = true;
 306                         break;
 307
 308                 case 2:                                 /* show version */
 309                         show_version = true;
 310                         break;
 311
 312                 case 3:                                 /* bypass security */
 313                         bypass_security = true;
 314                         break;
 315
 316                 case 4:                                 /* write log entries to a file */
 317                         use_logfile = true;
 318
 319                         if(!optarg && optind < argc && *argv[optind] != '-') {
 320                                 optarg = argv[optind++];
 321                         }
 322
 323                         if(optarg) {
 324                                 if(logfilename) {
 325                                         fprintf(stderr, "Only one logfile can be given.\n");
 326                                         usage(true);
 327                                         return false;
 328                                 }
 329
 330                                 logfilename = xstrdup(optarg);
 331                         }
 332
 333                         break;
 334
 335                 case 5:                                 /* write PID to a file */
 336                         if(pidfilename) {
 337                                 fprintf(stderr, "Only one pidfile can be given.\n");
 338                                 usage(true);
 339                                 return false;
 340                         }
 341
 342                         pidfilename = xstrdup(optarg);
 343                         break;
 344
 345                 case '?':
 346                         usage(true);
 347                         return false;
 348
 349                 default:
 350                         break;
 351                 }
 352         }
 353
 354         if(optind < argc) {
 355                 fprintf(stderr, "%s: unrecognized argument '%s'\n", argv[0], argv[optind]);
 356                 usage(true);
 357                 return false;
 358         }
 359
 360         return true;
 361 }
 362
 363 /* This function prettyprints the key generation process */
 364
 365 static int indicator(int a, int b, BN_GENCB *cb) {
 366         (void)cb;
 367
 368         switch(a) {
 369         case 0:
 370                 fprintf(stderr, ".");
 371                 break;
 372
 373         case 1:
 374                 fprintf(stderr, "+");
 375                 break;
 376
 377         case 2:
 378                 fprintf(stderr, "-");
 379                 break;
 380
 381         case 3:
 382                 switch(b) {
 383                 case 0:
 384                         fprintf(stderr, " p\n");
 385                         break;
 386
 387                 case 1:
 388                         fprintf(stderr, " q\n");
 389                         break;
 390
 391                 default:
 392                         fprintf(stderr, "?");
 393                 }
 394
 395                 break;
 396
 397         default:
 398                 fprintf(stderr, "?");
 399         }
 400
 401         return 1;
 402 }
 403
 404 #ifndef HAVE_BN_GENCB_NEW
 405 BN_GENCB *BN_GENCB_new(void) {
 406         return xmalloc_and_zero(sizeof(BN_GENCB));
 407 }
 408
 409 void BN_GENCB_free(BN_GENCB *cb) {
 410         free(cb);
 411 }
 412 #endif
 413
 414 /*
 415   Generate a public/private RSA keypair, and ask for a file to store
 416   them in.
 417 */
 418 static bool keygen(int bits) {
 419         BIGNUM *e = NULL;
 420         RSA *rsa_key;
 421         FILE *f;
 422         char filename[PATH_MAX];
 423         BN_GENCB *cb;
 424         int result;
 425
 426         fprintf(stderr, "Generating %d bits keys:\n", bits);
 427
 428         cb = BN_GENCB_new();
 429
 430         if(!cb) {
 431                 abort();
 432         }
 433
 434         BN_GENCB_set(cb, indicator, NULL);
 435
 436         rsa_key = RSA_new();
 437
 438         if(BN_hex2bn(&e, "10001") == 0) {
 439                 abort();
 440         }
 441
 442         if(!rsa_key || !e) {
 443                 abort();
 444         }
 445
 446         result = RSA_generate_key_ex(rsa_key, bits, e, cb);
 447
 448         BN_free(e);
 449         BN_GENCB_free(cb);
 450
 451         if(!result) {
 452                 fprintf(stderr, "Error during key generation!\n");
 453                 RSA_free(rsa_key);
 454                 return false;
 455         } else {
 456                 fprintf(stderr, "Done.\n");
 457         }
 458
 459         snprintf(filename, sizeof(filename), "%s/rsa_key.priv", confbase);
 460         f = ask_and_open(filename, "private RSA key");
 461
 462         if(!f) {
 463                 RSA_free(rsa_key);
 464                 return false;
 465         }
 466
 467 #ifdef HAVE_FCHMOD
 468         /* Make it unreadable for others. */
 469         fchmod(fileno(f), 0600);
 470 #endif
 471
 472         fputc('\n', f);
 473         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 474         fclose(f);
 475
 476         char *name = get_name();
 477
 478         if(name) {
 479                 snprintf(filename, sizeof(filename), "%s/hosts/%s", confbase, name);
 480                 free(name);
 481         } else {
 482                 snprintf(filename, sizeof(filename), "%s/rsa_key.pub", confbase);
 483         }
 484
 485         f = ask_and_open(filename, "public RSA key");
 486
 487         if(!f) {
 488                 RSA_free(rsa_key);
 489                 return false;
 490         }
 491
 492         fputc('\n', f);
 493         PEM_write_RSAPublicKey(f, rsa_key);
 494         fclose(f);
 495
 496         RSA_free(rsa_key);
 497
 498         return true;
 499 }
 500
 501 /*
 502   Set all files and paths according to netname
 503 */
 504 static void make_names(void) {
 505 #ifdef HAVE_MINGW
 506         HKEY key;
 507         char installdir[1024] = "";
 508         DWORD len = sizeof(installdir);
 509 #endif
 510
 511         if(netname) {
 512                 xasprintf(&identname, "tinc.%s", netname);
 513         } else {
 514                 identname = xstrdup("tinc");
 515         }
 516
 517 #ifdef HAVE_MINGW
 518
 519         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 520                 if(!RegQueryValueEx(key, NULL, 0, 0, (LPBYTE)installdir, &len)) {
 521                         if(!confbase) {
 522                                 if(netname) {
 523                                         xasprintf(&confbase, "%s/%s", installdir, netname);
 524                                 } else {
 525                                         xasprintf(&confbase, "%s", installdir);
 526                                 }
 527                         }
 528
 529                         if(!logfilename) {
 530                                 xasprintf(&logfilename, "%s/tinc.log", confbase);
 531                         }
 532                 }
 533
 534                 RegCloseKey(key);
 535
 536                 if(*installdir) {
 537                         return;
 538                 }
 539         }
 540
 541 #endif
 542
 543         if(!pidfilename) {
 544                 xasprintf(&pidfilename, RUNSTATEDIR "/%s.pid", identname);
 545         }
 546
 547         if(!logfilename) {
 548                 xasprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 549         }
 550
 551         if(netname) {
 552                 if(!confbase) {
 553                         xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
 554                 } else {
 555                         logger(LOG_INFO, "Both netname and configuration directory given, using the latter...");
 556                 }
 557         } else {
 558                 if(!confbase) {
 559                         xasprintf(&confbase, CONFDIR "/tinc");
 560                 }
 561         }
 562 }
 563
 564 static void free_names() {
 565         if(identname) {
 566                 free(identname);
 567         }
 568
 569         if(netname) {
 570                 free(netname);
 571         }
 572
 573         if(pidfilename) {
 574                 free(pidfilename);
 575         }
 576
 577         if(logfilename) {
 578                 free(logfilename);
 579         }
 580
 581         if(confbase) {
 582                 free(confbase);
 583         }
 584 }
 585
 586 static bool drop_privs() {
 587 #ifdef HAVE_MINGW
 588
 589         if(switchuser) {
 590                 logger(LOG_ERR, "%s not supported on this platform", "-U");
 591                 return false;
 592         }
 593
 594         if(do_chroot) {
 595                 logger(LOG_ERR, "%s not supported on this platform", "-R");
 596                 return false;
 597         }
 598
 599 #else
 600         uid_t uid = 0;
 601
 602         if(switchuser) {
 603                 struct passwd *pw = getpwnam(switchuser);
 604
 605                 if(!pw) {
 606                         logger(LOG_ERR, "unknown user `%s'", switchuser);
 607                         return false;
 608                 }
 609
 610                 uid = pw->pw_uid;
 611
 612                 if(initgroups(switchuser, pw->pw_gid) != 0 ||
 613                                 setgid(pw->pw_gid) != 0) {
 614                         logger(LOG_ERR, "System call `%s' failed: %s",
 615                                "initgroups", strerror(errno));
 616                         return false;
 617                 }
 618
 619 #ifndef ANDROID
 620 // Not supported in android NDK
 621                 endgrent();
 622                 endpwent();
 623 #endif
 624         }
 625
 626         if(do_chroot) {
 627                 tzset();        /* for proper timestamps in logs */
 628
 629                 if(chroot(confbase) != 0 || chdir("/") != 0) {
 630                         logger(LOG_ERR, "System call `%s' failed: %s",
 631                                "chroot", strerror(errno));
 632                         return false;
 633                 }
 634
 635                 free(confbase);
 636                 confbase = xstrdup("");
 637         }
 638
 639         if(switchuser)
 640                 if(setuid(uid) != 0) {
 641                         logger(LOG_ERR, "System call `%s' failed: %s",
 642                                "setuid", strerror(errno));
 643                         return false;
 644                 }
 645
 646 #endif
 647         return true;
 648 }
 649
 650 #ifdef HAVE_MINGW
 651 # define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
 652 #else
 653 # define NORMAL_PRIORITY_CLASS 0
 654 # define BELOW_NORMAL_PRIORITY_CLASS 10
 655 # define HIGH_PRIORITY_CLASS -10
 656 # define setpriority(level) (setpriority(PRIO_PROCESS, 0, (level)))
 657 #endif
 658
 659 int main(int argc, char **argv) {
 660         program_name = argv[0];
 661
 662         if(!parse_options(argc, argv)) {
 663                 return 1;
 664         }
 665
 666         if(show_version) {
 667                 printf("%s version %s\n", PACKAGE, VERSION);
 668                 printf("Copyright (C) 1998-2018 Ivo Timmermans, Guus Sliepen and others.\n"
 669                        "See the AUTHORS file for a complete list.\n\n"
 670                        "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 671                        "and you are welcome to redistribute it under certain conditions;\n"
 672                        "see the file COPYING for details.\n");
 673
 674                 return 0;
 675         }
 676
 677         if(show_help) {
 678                 usage(false);
 679                 return 0;
 680         }
 681
 682         make_names();
 683
 684         if(kill_tincd) {
 685                 return !kill_other(kill_tincd);
 686         }
 687
 688         openlogger("tinc", use_logfile ? LOGMODE_FILE : LOGMODE_STDERR);
 689
 690         g_argv = argv;
 691
 692         if(getenv("LISTEN_PID") && atoi(getenv("LISTEN_PID")) == getpid()) {
 693                 do_detach = false;
 694         }
 695
 696 #ifdef HAVE_UNSETENV
 697         unsetenv("LISTEN_PID");
 698 #endif
 699
 700         init_configuration(&config_tree);
 701
 702         /* Slllluuuuuuurrrrp! */
 703
 704         if(RAND_load_file("/dev/urandom", 1024) != 1024) {
 705                 logger(LOG_ERR, "Error initializing RNG!");
 706                 return 1;
 707         }
 708
 709         ENGINE_load_builtin_engines();
 710         ENGINE_register_all_complete();
 711
 712         OpenSSL_add_all_algorithms();
 713
 714         if(generate_keys) {
 715                 read_server_config();
 716                 return !keygen(generate_keys);
 717         }
 718
 719         if(!read_server_config()) {
 720                 return 1;
 721         }
 722
 723 #ifdef HAVE_LZO
 724
 725         if(lzo_init() != LZO_E_OK) {
 726                 logger(LOG_ERR, "Error initializing LZO compressor!");
 727                 return 1;
 728         }
 729
 730 #endif
 731
 732 #ifdef HAVE_MINGW
 733
 734         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 735                 logger(LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 736                 return 1;
 737         }
 738
 739         if(!do_detach || !init_service()) {
 740                 return main2(argc, argv);
 741         } else {
 742                 return 1;
 743         }
 744 }
 745
 746 int main2(int argc, char **argv) {
 747         InitializeCriticalSection(&mutex);
 748         EnterCriticalSection(&mutex);
 749 #endif
 750         char *priority = NULL;
 751
 752         if(!detach()) {
 753                 return 1;
 754         }
 755
 756 #ifdef HAVE_MLOCKALL
 757
 758         /* Lock all pages into memory if requested.
 759          * This has to be done after daemon()/fork() so it works for child.
 760          * No need to do that in parent as it's very short-lived. */
 761         if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
 762                 logger(LOG_ERR, "System call `%s' failed: %s", "mlockall",
 763                        strerror(errno));
 764                 return 1;
 765         }
 766
 767 #endif
 768
 769         /* Setup sockets and open device. */
 770
 771         if(!setup_network()) {
 772                 goto end;
 773         }
 774
 775         /* Initiate all outgoing connections. */
 776
 777         try_outgoing_connections();
 778
 779         /* Change process priority */
 780
 781         if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
 782                 if(!strcasecmp(priority, "Normal")) {
 783                         if(setpriority(NORMAL_PRIORITY_CLASS) != 0) {
 784                                 logger(LOG_ERR, "System call `%s' failed: %s",
 785                                        "setpriority", strerror(errno));
 786                                 goto end;
 787                         }
 788                 } else if(!strcasecmp(priority, "Low")) {
 789                         if(setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
 790                                 logger(LOG_ERR, "System call `%s' failed: %s",
 791                                        "setpriority", strerror(errno));
 792                                 goto end;
 793                         }
 794                 } else if(!strcasecmp(priority, "High")) {
 795                         if(setpriority(HIGH_PRIORITY_CLASS) != 0) {
 796                                 logger(LOG_ERR, "System call `%s' failed: %s",
 797                                        "setpriority", strerror(errno));
 798                                 goto end;
 799                         }
 800                 } else {
 801                         logger(LOG_ERR, "Invalid priority `%s`!", priority);
 802                         goto end;
 803                 }
 804         }
 805
 806         /* drop privileges */
 807         if(!drop_privs()) {
 808                 goto end;
 809         }
 810
 811         /* Start main loop. It only exits when tinc is killed. */
 812
 813         status = main_loop();
 814
 815         /* Shutdown properly. */
 816
 817         ifdebug(CONNECTIONS)
 818         devops.dump_stats();
 819
 820         close_network_connections();
 821
 822 end:
 823         logger(LOG_NOTICE, "Terminating");
 824
 825 #ifndef HAVE_MINGW
 826         remove_pid(pidfilename);
 827 #endif
 828
 829         free(priority);
 830
 831         EVP_cleanup();
 832         ERR_free_strings();
 833         ENGINE_cleanup();
 834
 835         exit_configuration(&config_tree);
 836         list_delete_list(cmdline_conf);
 837         free_names();
 838
 839         return status;
 840 }