2 tincd.c -- the main file for tincd
3 Copyright (C) 1998-2005 Ivo Timmermans
4 2000-2014 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>
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.
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.
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.
27 /* Darwin (MacOS/X) needs the following definition... */
28 #ifndef _P1003_1B_VISIBLE
29 #define _P1003_1B_VISIBLE
32 #ifdef HAVE_SYS_MMAN_H
63 /* If nonzero, display usage information and exit. */
64 static bool show_help = false;
66 /* If nonzero, print the version on standard output and exit. */
67 static bool show_version = false;
69 /* If nonzero, use null ciphers and skip all key exchanges. */
70 bool bypass_security = false;
73 /* If nonzero, disable swapping for this process. */
74 static bool do_mlock = false;
78 /* If nonzero, chroot to netdir after startup. */
79 static bool do_chroot = false;
81 /* If !NULL, do setuid to given user after startup */
82 static const char *switchuser = NULL;
85 /* If nonzero, write log entries to a separate file. */
86 bool use_logfile = false;
88 /* If nonzero, use syslog instead of stderr in no-detach mode. */
89 bool use_syslog = false;
91 char **g_argv; /* a copy of the cmdline arguments */
93 static int status = 1;
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 {"syslog", no_argument, NULL, 's'},
108 {"pidfile", required_argument, NULL, 5},
109 {"option", required_argument, NULL, 'o'},
114 static struct WSAData wsa_state;
115 int main2(int argc, char **argv);
118 static void usage(bool status) {
120 fprintf(stderr, "Try `%s --help\' for more information.\n",
123 printf("Usage: %s [option]...\n\n", program_name);
124 printf( " -c, --config=DIR Read configuration options from DIR.\n"
125 " -D, --no-detach Don't fork and detach.\n"
126 " -d, --debug[=LEVEL] Increase debug level or set it to LEVEL.\n"
127 " -n, --net=NETNAME Connect to net NETNAME.\n"
129 " -L, --mlock Lock tinc into main memory.\n"
131 " --logfile[=FILENAME] Write log entries to a logfile.\n"
132 " -s --syslog Use syslog instead of stderr with --no-detach.\n"
133 " --pidfile=FILENAME Write PID and control socket cookie to FILENAME.\n"
134 " --bypass-security Disables meta protocol security, for debugging.\n"
135 " -o, --option[HOST.]KEY=VALUE Set global/host configuration value.\n"
137 " -R, --chroot chroot to NET dir at startup.\n"
138 " -U, --user=USER setuid to given USER at startup.\n"
140 " --help Display this help and exit.\n"
141 " --version Output version information and exit.\n\n");
142 printf("Report bugs to tinc@tinc-vpn.org.\n");
146 static bool parse_options(int argc, char **argv) {
149 int option_index = 0;
152 cmdline_conf = list_alloc((list_action_t)free_config);
154 while((r = getopt_long(argc, argv, "c:DLd::n:so:RU:", long_options, &option_index)) != EOF) {
156 case 0: /* long option */
159 case 'c': /* config file */
160 confbase = xstrdup(optarg);
163 case 'D': /* no detach */
167 case 'L': /* no detach */
168 #ifndef HAVE_MLOCKALL
169 logger(DEBUG_ALWAYS, LOG_ERR, "The %s option is not supported on this platform.", argv[optind - 1]);
176 case 'd': /* increase debug level */
177 if(!optarg && optind < argc && *argv[optind] != '-')
178 optarg = argv[optind++];
180 debug_level = atoi(optarg);
185 case 'n': /* net name given */
186 netname = xstrdup(optarg);
189 case 's': /* syslog */
194 case 'o': /* option */
195 cfg = parse_config_line(optarg, NULL, ++lineno);
198 list_insert_tail(cmdline_conf, cfg);
204 logger(DEBUG_ALWAYS, LOG_ERR, "The %s option is not supported on this platform.", argv[optind - 1]);
207 case 'R': /* chroot to NETNAME dir */
211 case 'U': /* setuid to USER */
216 case 1: /* show help */
220 case 2: /* show version */
224 case 3: /* bypass security */
225 bypass_security = true;
228 case 4: /* write log entries to a file */
231 if(!optarg && optind < argc && *argv[optind] != '-')
232 optarg = argv[optind++];
234 logfilename = xstrdup(optarg);
237 case 5: /* open control socket here */
238 pidfilename = xstrdup(optarg);
241 case '?': /* wrong options */
251 fprintf(stderr, "%s: unrecognized argument '%s'\n", argv[0], argv[optind]);
256 if(!netname && (netname = getenv("NETNAME")))
257 netname = xstrdup(netname);
259 /* netname "." is special: a "top-level name" */
261 if(netname && (!*netname || !strcmp(netname, "."))) {
266 if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
267 fprintf(stderr, "Invalid character in netname!\n");
274 static bool drop_privs(void) {
278 struct passwd *pw = getpwnam(switchuser);
280 logger(DEBUG_ALWAYS, LOG_ERR, "unknown user `%s'", switchuser);
284 if (initgroups(switchuser, pw->pw_gid) != 0 ||
285 setgid(pw->pw_gid) != 0) {
286 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
287 "initgroups", strerror(errno));
291 // Not supported in android NDK
297 tzset(); /* for proper timestamps in logs */
298 if (chroot(confbase) != 0 || chdir("/") != 0) {
299 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
300 "chroot", strerror(errno));
304 confbase = xstrdup("");
307 if (setuid(uid) != 0) {
308 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
309 "setuid", strerror(errno));
317 # define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
319 static void stop_handler(void *data, int flags) {
323 static BOOL WINAPI console_ctrl_handler(DWORD type) {
324 logger(DEBUG_ALWAYS, LOG_NOTICE, "Got console shutdown request");
325 if (WSASetEvent(stop_io.event) == FALSE)
330 # define NORMAL_PRIORITY_CLASS 0
331 # define BELOW_NORMAL_PRIORITY_CLASS 10
332 # define HIGH_PRIORITY_CLASS -10
333 # define setpriority(level) (setpriority(PRIO_PROCESS, 0, (level)))
336 int main(int argc, char **argv) {
337 program_name = argv[0];
339 if(!parse_options(argc, argv))
345 printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
346 BUILD_VERSION, BUILD_DATE, BUILD_TIME, PROT_MAJOR, PROT_MINOR);
347 printf("Copyright (C) 1998-2014 Ivo Timmermans, Guus Sliepen and others.\n"
348 "See the AUTHORS file for a complete list.\n\n"
349 "tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
350 "and you are welcome to redistribute it under certain conditions;\n"
351 "see the file COPYING for details.\n");
362 if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
363 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
368 openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
372 if(getenv("LISTEN_PID") && atoi(getenv("LISTEN_PID")) == getpid())
375 unsetenv("LISTEN_PID");
378 init_configuration(&config_tree);
380 /* Slllluuuuuuurrrrp! */
382 gettimeofday(&now, NULL);
383 srand(now.tv_sec + now.tv_usec);
386 if(!read_server_config())
390 if(lzo_init() != LZO_E_OK) {
391 logger(DEBUG_ALWAYS, LOG_ERR, "Error initializing LZO compressor!");
397 io_add_event(&stop_io, stop_handler, NULL, WSACreateEvent());
398 if (stop_io.event == FALSE)
402 if(!do_detach || !init_service()) {
403 SetConsoleCtrlHandler(console_ctrl_handler, TRUE);
404 result = main2(argc, argv);
408 if (WSACloseEvent(stop_io.event) == FALSE)
414 int main2(int argc, char **argv) {
416 char *priority = NULL;
422 /* Lock all pages into memory if requested.
423 * This has to be done after daemon()/fork() so it works for child.
424 * No need to do that in parent as it's very short-lived. */
425 if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
426 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "mlockall",
432 /* Setup sockets and open device. */
437 /* Change process priority */
439 if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
440 if(!strcasecmp(priority, "Normal")) {
441 if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
442 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
445 } else if(!strcasecmp(priority, "Low")) {
446 if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
447 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
450 } else if(!strcasecmp(priority, "High")) {
451 if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
452 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
456 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid priority `%s`!", priority);
461 /* drop privileges */
465 /* Start main loop. It only exits when tinc is killed. */
467 logger(DEBUG_ALWAYS, LOG_NOTICE, "Ready");
469 try_outgoing_connections();
471 status = main_loop();
473 /* Shutdown properly. */
476 close_network_connections();
478 logger(DEBUG_ALWAYS, LOG_NOTICE, "Terminating");
484 exit_configuration(&config_tree);