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
61 /* If nonzero, display usage information and exit. */
62 static bool show_help = false;
64 /* If nonzero, print the version on standard output and exit. */
65 static bool show_version = false;
67 /* If nonzero, use null ciphers and skip all key exchanges. */
68 bool bypass_security = false;
71 /* If nonzero, disable swapping for this process. */
72 static bool do_mlock = false;
76 /* If nonzero, chroot to netdir after startup. */
77 static bool do_chroot = false;
79 /* If !NULL, do setuid to given user after startup */
80 static const char *switchuser = NULL;
83 /* If nonzero, write log entries to a separate file. */
84 bool use_logfile = false;
86 /* If nonzero, use syslog instead of stderr in no-detach mode. */
87 bool use_syslog = false;
89 char **g_argv; /* a copy of the cmdline arguments */
91 static int status = 1;
93 static struct option const long_options[] = {
94 {"config", required_argument, NULL, 'c'},
95 {"net", required_argument, NULL, 'n'},
96 {"help", no_argument, NULL, 1},
97 {"version", no_argument, NULL, 2},
98 {"no-detach", no_argument, NULL, 'D'},
99 {"debug", optional_argument, NULL, 'd'},
100 {"bypass-security", no_argument, NULL, 3},
101 {"mlock", no_argument, NULL, 'L'},
102 {"chroot", no_argument, NULL, 'R'},
103 {"user", required_argument, NULL, 'U'},
104 {"logfile", optional_argument, NULL, 4},
105 {"syslog", no_argument, NULL, 's'},
106 {"pidfile", required_argument, NULL, 5},
107 {"option", required_argument, NULL, 'o'},
112 static struct WSAData wsa_state;
113 CRITICAL_SECTION mutex;
114 int main2(int argc, char **argv);
117 static void usage(bool status) {
119 fprintf(stderr, "Try `%s --help\' for more information.\n",
122 printf("Usage: %s [option]...\n\n", program_name);
123 printf( " -c, --config=DIR Read configuration options from DIR.\n"
124 " -D, --no-detach Don't fork and detach.\n"
125 " -d, --debug[=LEVEL] Increase debug level or set it to LEVEL.\n"
126 " -n, --net=NETNAME Connect to net NETNAME.\n"
128 " -L, --mlock Lock tinc into main memory.\n"
130 " --logfile[=FILENAME] Write log entries to a logfile.\n"
131 " -s --syslog Use syslog instead of stderr with --no-detach.\n"
132 " --pidfile=FILENAME Write PID and control socket cookie to FILENAME.\n"
133 " --bypass-security Disables meta protocol security, for debugging.\n"
134 " -o, --option[HOST.]KEY=VALUE Set global/host configuration value.\n"
136 " -R, --chroot chroot to NET dir at startup.\n"
137 " -U, --user=USER setuid to given USER at startup.\n"
139 " --help Display this help and exit.\n"
140 " --version Output version information and exit.\n\n");
141 printf("Report bugs to tinc@tinc-vpn.org.\n");
145 static bool parse_options(int argc, char **argv) {
148 int option_index = 0;
151 cmdline_conf = list_alloc((list_action_t)free_config);
153 while((r = getopt_long(argc, argv, "c:DLd::n:so:RU:", long_options, &option_index)) != EOF) {
155 case 0: /* long option */
158 case 'c': /* config file */
159 confbase = xstrdup(optarg);
162 case 'D': /* no detach */
166 case 'L': /* no detach */
167 #ifndef HAVE_MLOCKALL
168 logger(DEBUG_ALWAYS, LOG_ERR, "The %s option is not supported on this platform.", argv[optind - 1]);
175 case 'd': /* increase debug level */
176 if(!optarg && optind < argc && *argv[optind] != '-')
177 optarg = argv[optind++];
179 debug_level = atoi(optarg);
184 case 'n': /* net name given */
185 netname = xstrdup(optarg);
188 case 's': /* syslog */
192 case 'o': /* option */
193 cfg = parse_config_line(optarg, NULL, ++lineno);
196 list_insert_tail(cmdline_conf, cfg);
202 logger(DEBUG_ALWAYS, LOG_ERR, "The %s option is not supported on this platform.", argv[optind - 1]);
205 case 'R': /* chroot to NETNAME dir */
209 case 'U': /* setuid to USER */
214 case 1: /* show help */
218 case 2: /* show version */
222 case 3: /* bypass security */
223 bypass_security = true;
226 case 4: /* write log entries to a file */
228 if(!optarg && optind < argc && *argv[optind] != '-')
229 optarg = argv[optind++];
231 logfilename = xstrdup(optarg);
234 case 5: /* open control socket here */
235 pidfilename = xstrdup(optarg);
238 case '?': /* wrong options */
248 fprintf(stderr, "%s: unrecognized argument '%s'\n", argv[0], argv[optind]);
253 if(!netname && (netname = getenv("NETNAME")))
254 netname = xstrdup(netname);
256 /* netname "." is special: a "top-level name" */
258 if(netname && (!*netname || !strcmp(netname, "."))) {
263 if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
264 fprintf(stderr, "Invalid character in netname!\n");
271 static bool drop_privs(void) {
275 struct passwd *pw = getpwnam(switchuser);
277 logger(DEBUG_ALWAYS, LOG_ERR, "unknown user `%s'", switchuser);
281 if (initgroups(switchuser, pw->pw_gid) != 0 ||
282 setgid(pw->pw_gid) != 0) {
283 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
284 "initgroups", strerror(errno));
288 // Not supported in android NDK
294 tzset(); /* for proper timestamps in logs */
295 if (chroot(confbase) != 0 || chdir("/") != 0) {
296 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
297 "chroot", strerror(errno));
301 confbase = xstrdup("");
304 if (setuid(uid) != 0) {
305 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
306 "setuid", strerror(errno));
314 # define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
316 # define NORMAL_PRIORITY_CLASS 0
317 # define BELOW_NORMAL_PRIORITY_CLASS 10
318 # define HIGH_PRIORITY_CLASS -10
319 # define setpriority(level) (setpriority(PRIO_PROCESS, 0, (level)))
322 int main(int argc, char **argv) {
323 program_name = argv[0];
325 if(!parse_options(argc, argv))
331 printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
332 VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
333 printf("Copyright (C) 1998-2014 Ivo Timmermans, Guus Sliepen and others.\n"
334 "See the AUTHORS file for a complete list.\n\n"
335 "tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
336 "and you are welcome to redistribute it under certain conditions;\n"
337 "see the file COPYING for details.\n");
348 if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
349 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
354 openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
358 if(getenv("LISTEN_PID") && atoi(getenv("LISTEN_PID")) == getpid())
361 unsetenv("LISTEN_PID");
364 init_configuration(&config_tree);
366 /* Slllluuuuuuurrrrp! */
368 gettimeofday(&now, NULL);
369 srand(now.tv_sec + now.tv_usec);
372 if(!read_server_config())
376 if(lzo_init() != LZO_E_OK) {
377 logger(DEBUG_ALWAYS, LOG_ERR, "Error initializing LZO compressor!");
383 if(!do_detach || !init_service())
384 return main2(argc, argv);
389 int main2(int argc, char **argv) {
390 InitializeCriticalSection(&mutex);
391 EnterCriticalSection(&mutex);
393 char *priority = NULL;
399 /* Lock all pages into memory if requested.
400 * This has to be done after daemon()/fork() so it works for child.
401 * No need to do that in parent as it's very short-lived. */
402 if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
403 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "mlockall",
409 /* Setup sockets and open device. */
414 /* Change process priority */
416 if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
417 if(!strcasecmp(priority, "Normal")) {
418 if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
419 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
422 } else if(!strcasecmp(priority, "Low")) {
423 if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
424 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
427 } else if(!strcasecmp(priority, "High")) {
428 if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
429 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
433 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid priority `%s`!", priority);
438 /* drop privileges */
442 /* Start main loop. It only exits when tinc is killed. */
444 logger(DEBUG_ALWAYS, LOG_NOTICE, "Ready");
446 try_outgoing_connections();
448 status = main_loop();
450 /* Shutdown properly. */
453 close_network_connections();
455 logger(DEBUG_ALWAYS, LOG_NOTICE, "Terminating");
461 exit_configuration(&config_tree);