2 tincd.c -- the main file for tincd
3 Copyright (C) 1998-2005 Ivo Timmermans
4 2000-2012 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
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>
66 /* The name this program was run with. */
67 char *program_name = NULL;
69 /* If nonzero, display usage information and exit. */
70 static bool show_help = false;
72 /* If nonzero, print the version on standard output and exit. */
73 static bool show_version = false;
75 /* If nonzero, use null ciphers and skip all key exchanges. */
76 bool bypass_security = false;
78 /* If nonzero, disable swapping for this process. */
79 static bool do_mlock = false;
81 /* If nonzero, chroot to netdir after startup. */
82 static bool do_chroot = false;
84 /* If !NULL, do setuid to given user after startup */
85 static const char *switchuser = NULL;
87 /* If nonzero, write log entries to a separate file. */
88 bool use_logfile = false;
90 char *identname = NULL; /* program name for syslog */
91 char *logfilename = NULL; /* log file location */
92 char *pidfilename = NULL;
93 char **g_argv; /* a copy of the cmdline arguments */
95 static int status = 1;
97 static struct option const long_options[] = {
98 {"config", required_argument, NULL, 'c'},
99 {"net", required_argument, NULL, 'n'},
100 {"help", no_argument, NULL, 1},
101 {"version", no_argument, NULL, 2},
102 {"no-detach", no_argument, NULL, 'D'},
103 {"debug", optional_argument, NULL, 'd'},
104 {"bypass-security", no_argument, NULL, 3},
105 {"mlock", no_argument, NULL, 'L'},
106 {"chroot", no_argument, NULL, 'R'},
107 {"user", required_argument, NULL, 'U'},
108 {"logfile", optional_argument, NULL, 4},
109 {"pidfile", required_argument, NULL, 5},
110 {"option", required_argument, NULL, 'o'},
115 static struct WSAData wsa_state;
116 CRITICAL_SECTION mutex;
117 int main2(int argc, char **argv);
120 static void usage(bool status) {
122 fprintf(stderr, "Try `%s --help\' for more information.\n",
125 printf("Usage: %s [option]...\n\n", program_name);
126 printf( " -c, --config=DIR Read configuration options from DIR.\n"
127 " -D, --no-detach Don't fork and detach.\n"
128 " -d, --debug[=LEVEL] Increase debug level or set it to LEVEL.\n"
129 " -n, --net=NETNAME Connect to net NETNAME.\n"
130 " -L, --mlock Lock tinc into main memory.\n"
131 " --logfile[=FILENAME] Write log entries to a logfile.\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"
135 " -R, --chroot chroot to NET dir at startup.\n"
136 " -U, --user=USER setuid to given USER at startup.\n" " --help Display this help and exit.\n"
137 " --version Output version information and exit.\n\n");
138 printf("Report bugs to tinc@tinc-vpn.org.\n");
142 static bool parse_options(int argc, char **argv) {
145 int option_index = 0;
148 cmdline_conf = list_alloc((list_action_t)free_config);
150 while((r = getopt_long(argc, argv, "c:DLd::n:o:RU:", long_options, &option_index)) != EOF) {
152 case 0: /* long option */
155 case 'c': /* config file */
156 confbase = xstrdup(optarg);
159 case 'D': /* no detach */
163 case 'L': /* no detach */
164 #ifndef HAVE_MLOCKALL
165 logger(DEBUG_ALWAYS, LOG_ERR, "%s not supported on this platform", "mlockall()");
172 case 'd': /* inc debug level */
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);
190 case 'R': /* chroot to NETNAME dir */
194 case 'U': /* setuid to USER */
198 case 1: /* show help */
202 case 2: /* show version */
206 case 3: /* bypass security */
207 bypass_security = true;
210 case 4: /* write log entries to a file */
213 logfilename = xstrdup(optarg);
216 case 5: /* open control socket here */
217 pidfilename = xstrdup(optarg);
220 case '?': /* wrong options */
229 if(!netname && (netname = getenv("NETNAME")))
230 netname = xstrdup(netname);
232 /* netname "." is special: a "top-level name" */
234 if(netname && (!*netname || !strcmp(netname, "."))) {
239 if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
240 fprintf(stderr, "Invalid character in netname!\n");
248 Set all files and paths according to netname
250 static void make_names(void) {
253 char installdir[1024] = "";
254 long len = sizeof installdir;
258 xasprintf(&identname, "tinc.%s", netname);
260 identname = xstrdup("tinc");
263 if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
264 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
266 xasprintf(&logfilename, "%s" SLASH "log" SLASH "%s.log", identname);
269 xasprintf(&confbase, "%s" SLASH "%s", installdir, netname);
271 xasprintf(&confbase, "%s", installdir);
274 xasprintf(&pidfilename, "%s" SLASH "pid", confbase);
283 xasprintf(&logfilename, LOCALSTATEDIR SLASH "log" SLASH "%s.log", identname);
286 xasprintf(&pidfilename, LOCALSTATEDIR SLASH "run" SLASH "%s.pid", identname);
290 xasprintf(&confbase, CONFDIR SLASH "tinc" SLASH "%s", netname);
292 logger(DEBUG_ALWAYS, LOG_INFO, "Both netname and configuration directory given, using the latter...");
295 xasprintf(&confbase, CONFDIR SLASH "tinc");
299 static void free_names(void) {
300 if (identname) free(identname);
301 if (netname) free(netname);
302 if (pidfilename) free(pidfilename);
303 if (logfilename) free(logfilename);
304 if (confbase) free(confbase);
307 static bool drop_privs(void) {
310 logger(DEBUG_ALWAYS, LOG_ERR, "%s not supported on this platform", "-U");
314 logger(DEBUG_ALWAYS, LOG_ERR, "%s not supported on this platform", "-R");
320 struct passwd *pw = getpwnam(switchuser);
322 logger(DEBUG_ALWAYS, LOG_ERR, "unknown user `%s'", switchuser);
326 if (initgroups(switchuser, pw->pw_gid) != 0 ||
327 setgid(pw->pw_gid) != 0) {
328 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
329 "initgroups", strerror(errno));
333 // Not supported in android NDK
339 tzset(); /* for proper timestamps in logs */
340 if (chroot(confbase) != 0 || chdir("/") != 0) {
341 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
342 "chroot", strerror(errno));
346 confbase = xstrdup("");
349 if (setuid(uid) != 0) {
350 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
351 "setuid", strerror(errno));
359 # define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
361 # define NORMAL_PRIORITY_CLASS 0
362 # define BELOW_NORMAL_PRIORITY_CLASS 10
363 # define HIGH_PRIORITY_CLASS -10
364 # define setpriority(level) (setpriority(PRIO_PROCESS, 0, (level)))
367 int main(int argc, char **argv) {
368 program_name = argv[0];
370 if(!parse_options(argc, argv))
376 printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
377 VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
378 printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
379 "See the AUTHORS file for a complete list.\n\n"
380 "tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
381 "and you are welcome to redistribute it under certain conditions;\n"
382 "see the file COPYING for details.\n");
393 if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
394 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
399 openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
403 if(getenv("LISTEN_PID") && atoi(getenv("LISTEN_PID")) == getpid())
406 unsetenv("LISTEN_PID");
409 init_configuration(&config_tree);
411 /* Slllluuuuuuurrrrp! */
416 if(!read_server_config())
420 if(lzo_init() != LZO_E_OK) {
421 logger(DEBUG_ALWAYS, LOG_ERR, "Error initializing LZO compressor!");
427 if(!do_detach || !init_service())
428 return main2(argc, argv);
433 int main2(int argc, char **argv) {
434 InitializeCriticalSection(&mutex);
435 EnterCriticalSection(&mutex);
437 char *priority = NULL;
443 /* Lock all pages into memory if requested.
444 * This has to be done after daemon()/fork() so it works for child.
445 * No need to do that in parent as it's very short-lived. */
446 if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
447 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "mlockall",
453 /* Setup sockets and open device. */
461 /* Initiate all outgoing connections. */
463 try_outgoing_connections();
465 /* Change process priority */
467 if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
468 if(!strcasecmp(priority, "Normal")) {
469 if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
470 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
473 } else if(!strcasecmp(priority, "Low")) {
474 if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
475 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
478 } else if(!strcasecmp(priority, "High")) {
479 if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
480 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setpriority", strerror(errno));
484 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid priority `%s`!", priority);
489 /* drop privileges */
493 /* Start main loop. It only exits when tinc is killed. */
495 status = main_loop();
497 /* Shutdown properly. */
499 if(debug_level >= DEBUG_CONNECTIONS)
502 close_network_connections();
508 logger(DEBUG_ALWAYS, LOG_NOTICE, "Terminating");
514 exit_configuration(&config_tree);