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
62 /* If nonzero, display usage information and exit. */
63 static bool show_help = false;
65 /* If nonzero, print the version on standard output and exit. */
66 static bool show_version = false;
68 /* If nonzero, use null ciphers and skip all key exchanges. */
69 bool bypass_security = false;
72 /* If nonzero, disable swapping for this process. */
73 static bool do_mlock = false;
77 /* If nonzero, chroot to netdir after startup. */
78 static bool do_chroot = false;
80 /* If !NULL, do setuid to given user after startup */
81 static const char *switchuser = NULL;
84 /* If nonzero, write log entries to a separate file. */
85 bool use_logfile = false;
87 char **g_argv; /* a copy of the cmdline arguments */
89 static int status = 1;
91 static struct option const long_options[] = {
92 {"config", required_argument, NULL, 'c'},
93 {"net", required_argument, NULL, 'n'},
94 {"help", no_argument, NULL, 1},
95 {"version", no_argument, NULL, 2},
96 {"no-detach", no_argument, NULL, 'D'},
97 {"debug", optional_argument, NULL, 'd'},
98 {"bypass-security", no_argument, NULL, 3},
99 {"mlock", no_argument, NULL, 'L'},
100 {"chroot", no_argument, NULL, 'R'},
101 {"user", required_argument, NULL, 'U'},
102 {"logfile", optional_argument, NULL, 4},
103 {"pidfile", required_argument, NULL, 5},
104 {"option", required_argument, NULL, 'o'},
109 static struct WSAData wsa_state;
110 int main2(int argc, char **argv);
113 static void usage(bool status) {
115 fprintf(stderr, "Try `%s --help\' for more information.\n",
118 printf("Usage: %s [option]...\n\n", program_name);
119 printf( " -c, --config=DIR Read configuration options from DIR.\n"
120 " -D, --no-detach Don't fork and detach.\n"
121 " -d, --debug[=LEVEL] Increase debug level or set it to LEVEL.\n"
122 " -n, --net=NETNAME Connect to net NETNAME.\n"
124 " -L, --mlock Lock tinc into main memory.\n"
126 " --logfile[=FILENAME] Write log entries to a logfile.\n"
127 " --pidfile=FILENAME Write PID and control socket cookie to FILENAME.\n"
128 " --bypass-security Disables meta protocol security, for debugging.\n"
129 " -o, --option[HOST.]KEY=VALUE Set global/host configuration value.\n"
131 " -R, --chroot chroot to NET dir at startup.\n"
132 " -U, --user=USER setuid to given USER at startup.\n"
134 " --help Display this help and exit.\n"
135 " --version Output version information and exit.\n\n");
136 printf("Report bugs to tinc@tinc-vpn.org.\n");
140 static bool parse_options(int argc, char **argv) {
143 int option_index = 0;
146 cmdline_conf = list_alloc((list_action_t)free_config);
148 while((r = getopt_long(argc, argv, "c:DLd::n:o:RU:", long_options, &option_index)) != EOF) {
150 case 0: /* long option */
153 case 'c': /* config file */
154 confbase = xstrdup(optarg);
157 case 'D': /* no detach */
161 case 'L': /* no detach */
162 #ifndef HAVE_MLOCKALL
163 logger(DEBUG_ALWAYS, LOG_ERR, "The %s option is not supported on this platform.", argv[optind - 1]);
170 case 'd': /* increase debug level */
171 if(!optarg && optind < argc && *argv[optind] != '-')
172 optarg = argv[optind++];
174 debug_level = atoi(optarg);
179 case 'n': /* net name given */
180 netname = xstrdup(optarg);
183 case 'o': /* option */
184 cfg = parse_config_line(optarg, NULL, ++lineno);
187 list_insert_tail(cmdline_conf, cfg);
193 logger(DEBUG_ALWAYS, LOG_ERR, "The %s option is not supported on this platform.", argv[optind - 1]);
196 case 'R': /* chroot to NETNAME dir */
200 case 'U': /* setuid to USER */
205 case 1: /* show help */
209 case 2: /* show version */
213 case 3: /* bypass security */
214 bypass_security = true;
217 case 4: /* write log entries to a file */
219 if(!optarg && optind < argc && *argv[optind] != '-')
220 optarg = argv[optind++];
222 logfilename = xstrdup(optarg);
225 case 5: /* open control socket here */
226 pidfilename = xstrdup(optarg);
229 case '?': /* wrong options */
239 fprintf(stderr, "%s: unrecognized argument '%s'\n", argv[0], argv[optind]);
244 if(!netname && (netname = getenv("NETNAME")))
245 netname = xstrdup(netname);
247 /* netname "." is special: a "top-level name" */
249 if(netname && (!*netname || !strcmp(netname, "."))) {
254 if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
255 fprintf(stderr, "Invalid character in netname!\n");
262 static bool drop_privs(void) {
266 struct passwd *pw = getpwnam(switchuser);
268 logger(DEBUG_ALWAYS, LOG_ERR, "unknown user `%s'", switchuser);
272 if (initgroups(switchuser, pw->pw_gid) != 0 ||
273 setgid(pw->pw_gid) != 0) {
274 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
275 "initgroups", strerror(errno));
279 // Not supported in android NDK
285 tzset(); /* for proper timestamps in logs */
286 if (chroot(confbase) != 0 || chdir("/") != 0) {
287 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
288 "chroot", strerror(errno));
292 confbase = xstrdup("");
295 if (setuid(uid) != 0) {
296 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
297 "setuid", strerror(errno));
305 # define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
307 # define NORMAL_PRIORITY_CLASS 0
308 # define BELOW_NORMAL_PRIORITY_CLASS 10
309 # define HIGH_PRIORITY_CLASS -10
310 # define setpriority(level) (setpriority(PRIO_PROCESS, 0, (level)))
313 int main(int argc, char **argv) {
314 program_name = argv[0];
316 if(!parse_options(argc, argv))
322 printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
323 VERSION, BUILD_DATE, BUILD_TIME, PROT_MAJOR, PROT_MINOR);
324 printf("Copyright (C) 1998-2014 Ivo Timmermans, Guus Sliepen and others.\n"
325 "See the AUTHORS file for a complete list.\n\n"
326 "tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
327 "and you are welcome to redistribute it under certain conditions;\n"
328 "see the file COPYING for details.\n");
339 if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
340 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
345 openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
349 if(getenv("LISTEN_PID") && atoi(getenv("LISTEN_PID")) == getpid())
352 unsetenv("LISTEN_PID");
355 init_configuration(&config_tree);
357 /* Slllluuuuuuurrrrp! */
359 gettimeofday(&now, NULL);
360 srand(now.tv_sec + now.tv_usec);
363 if(!read_server_config())
367 if(lzo_init() != LZO_E_OK) {
368 logger(DEBUG_ALWAYS, LOG_ERR, "Error initializing LZO compressor!");
374 if(!do_detach || !init_service())
375 return main2(argc, argv);
380 int main2(int argc, char **argv) {
382 char *priority = NULL;
388 /* Lock all pages into memory if requested.
389 * This has to be done after daemon()/fork() so it works for child.
390 * No need to do that in parent as it's very short-lived. */
391 if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
392 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "mlockall",
398 /* Setup sockets and open device. */
403 /* Change process priority */
405 if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
406 if(!strcasecmp(priority, "Normal")) {
407 if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
408 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
411 } else if(!strcasecmp(priority, "Low")) {
412 if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
413 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
416 } else if(!strcasecmp(priority, "High")) {
417 if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
418 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
422 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid priority `%s`!", priority);
427 /* drop privileges */
431 /* Start main loop. It only exits when tinc is killed. */
433 logger(DEBUG_ALWAYS, LOG_NOTICE, "Ready");
435 try_outgoing_connections();
437 status = main_loop();
439 /* Shutdown properly. */
442 close_network_connections();
444 logger(DEBUG_ALWAYS, LOG_NOTICE, "Terminating");
450 exit_configuration(&config_tree);