2 tincd.c -- the main file for tincd
3 Copyright (C) 1998-2005 Ivo Timmermans
4 2000-2009 Guus Sliepen <guus@tinc-vpn.org>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 /* Darwin (MacOS/X) needs the following definition... */
26 #ifndef _P1003_1B_VISIBLE
27 #define _P1003_1B_VISIBLE
30 #ifdef HAVE_SYS_MMAN_H
34 #include <openssl/rand.h>
35 #include <openssl/rsa.h>
36 #include <openssl/pem.h>
37 #include <openssl/evp.h>
38 #include <openssl/engine.h>
61 /* The name this program was run with. */
62 char *program_name = NULL;
64 /* If nonzero, display usage information and exit. */
65 bool show_help = false;
67 /* If nonzero, print the version on standard output and exit. */
68 bool show_version = false;
70 /* If nonzero, it will attempt to kill a running tincd and exit. */
73 /* If nonzero, generate public/private keypair for this host/net. */
74 int generate_keys = 0;
76 /* If nonzero, use null ciphers and skip all key exchanges. */
77 bool bypass_security = false;
79 /* If nonzero, disable swapping for this process. */
80 bool do_mlock = false;
82 /* If nonzero, chroot to netdir after startup. */
83 static bool do_chroot = false;
85 /* If !NULL, do setuid to given user after startup */
86 static const char *switchuser = NULL;
88 /* If nonzero, write log entries to a separate file. */
89 bool use_logfile = false;
91 char *identname = NULL; /* program name for syslog */
92 char *pidfilename = NULL; /* pid file location */
93 char *logfilename = NULL; /* log file location */
94 char **g_argv; /* a copy of the cmdline arguments */
98 static struct option const long_options[] = {
99 {"config", required_argument, NULL, 'c'},
100 {"kill", optional_argument, NULL, 'k'},
101 {"net", required_argument, NULL, 'n'},
102 {"help", no_argument, NULL, 1},
103 {"version", no_argument, NULL, 2},
104 {"no-detach", no_argument, NULL, 'D'},
105 {"generate-keys", optional_argument, NULL, 'K'},
106 {"debug", optional_argument, NULL, 'd'},
107 {"bypass-security", no_argument, NULL, 3},
108 {"mlock", no_argument, NULL, 'L'},
109 {"chroot", no_argument, NULL, 'R'},
110 {"user", required_argument, NULL, 'U'},
111 {"logfile", optional_argument, NULL, 4},
112 {"pidfile", required_argument, NULL, 5},
117 static struct WSAData wsa_state;
118 CRITICAL_SECTION mutex;
121 static void usage(bool status)
124 fprintf(stderr, _("Try `%s --help\' for more information.\n"),
127 printf(_("Usage: %s [option]...\n\n"), program_name);
128 printf(_(" -c, --config=DIR Read configuration options from DIR.\n"
129 " -D, --no-detach Don't fork and detach.\n"
130 " -d, --debug[=LEVEL] Increase debug level or set it to LEVEL.\n"
131 " -k, --kill[=SIGNAL] Attempt to kill a running tincd and exit.\n"
132 " -n, --net=NETNAME Connect to net NETNAME.\n"
133 " -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
134 " -L, --mlock Lock tinc into main memory.\n"
135 " --logfile[=FILENAME] Write log entries to a logfile.\n"
136 " --pidfile=FILENAME Write PID to FILENAME.\n"
137 " -R, --chroot chroot to NET dir at startup.\n"
138 " -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;
150 while((r = getopt_long(argc, argv, "c:DLd::k::n:K::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(LOG_ERR, _("%s not supported on this platform"), "mlockall()");
172 case 'd': /* inc debug level */
174 debug_level = atoi(optarg);
179 case 'k': /* kill old tincds */
182 if(!strcasecmp(optarg, "HUP"))
184 else if(!strcasecmp(optarg, "TERM"))
185 kill_tincd = SIGTERM;
186 else if(!strcasecmp(optarg, "KILL"))
187 kill_tincd = SIGKILL;
188 else if(!strcasecmp(optarg, "USR1"))
189 kill_tincd = SIGUSR1;
190 else if(!strcasecmp(optarg, "USR2"))
191 kill_tincd = SIGUSR2;
192 else if(!strcasecmp(optarg, "WINCH"))
193 kill_tincd = SIGWINCH;
194 else if(!strcasecmp(optarg, "INT"))
196 else if(!strcasecmp(optarg, "ALRM"))
197 kill_tincd = SIGALRM;
199 kill_tincd = atoi(optarg);
202 fprintf(stderr, _("Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n"),
209 kill_tincd = SIGTERM;
215 case 'n': /* net name given */
216 netname = xstrdup(optarg);
219 case 'K': /* generate public/private keypair */
221 generate_keys = atoi(optarg);
223 if(generate_keys < 512) {
224 fprintf(stderr, _("Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n"),
230 generate_keys &= ~7; /* Round it to bytes */
232 generate_keys = 2048;
235 case 'R': /* chroot to NETNAME dir */
239 case 'U': /* setuid to USER */
243 case 1: /* show help */
247 case 2: /* show version */
251 case 3: /* bypass security */
252 bypass_security = true;
255 case 4: /* write log entries to a file */
258 logfilename = xstrdup(optarg);
261 case 5: /* write PID to a file */
262 pidfilename = xstrdup(optarg);
277 /* This function prettyprints the key generation process */
279 static void indicator(int a, int b, void *p)
283 fprintf(stderr, ".");
287 fprintf(stderr, "+");
291 fprintf(stderr, "-");
297 fprintf(stderr, " p\n");
301 fprintf(stderr, " q\n");
305 fprintf(stderr, "?");
310 fprintf(stderr, "?");
315 Generate a public/private RSA keypair, and ask for a file to store
318 static bool keygen(int bits)
325 get_config_string(lookup_config(config_tree, "Name"), &name);
327 if(name && !check_id(name)) {
328 fprintf(stderr, _("Invalid name for myself!\n"));
332 fprintf(stderr, _("Generating %d bits keys:\n"), bits);
333 rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
336 fprintf(stderr, _("Error during key generation!\n"));
339 fprintf(stderr, _("Done.\n"));
341 xasprintf(&filename, "%s/rsa_key.priv", confbase);
342 f = ask_and_open(filename, _("private RSA key"));
347 if(disable_old_keys(f))
348 fprintf(stderr, _("Warning: old key(s) found and disabled.\n"));
351 /* Make it unreadable for others. */
352 fchmod(fileno(f), 0600);
355 PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
360 xasprintf(&filename, "%s/hosts/%s", confbase, name);
362 xasprintf(&filename, "%s/rsa_key.pub", confbase);
364 f = ask_and_open(filename, _("public RSA key"));
369 if(disable_old_keys(f))
370 fprintf(stderr, _("Warning: old key(s) found and disabled.\n"));
372 PEM_write_RSAPublicKey(f, rsa_key);
382 Set all files and paths according to netname
384 static void make_names(void)
388 char installdir[1024] = "";
389 long len = sizeof(installdir);
393 xasprintf(&identname, "tinc.%s", netname);
395 identname = xstrdup("tinc");
398 if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
399 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
401 xasprintf(&logfilename, "%s/log/%s.log", identname);
404 xasprintf(&confbase, "%s/%s", installdir, netname);
406 xasprintf(&confbase, "%s", installdir);
416 xasprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
419 xasprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
423 xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
425 logger(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
428 xasprintf(&confbase, CONFDIR "/tinc");
432 static void free_names() {
433 if (identname) free(identname);
434 if (netname) free(netname);
435 if (pidfilename) free(pidfilename);
436 if (logfilename) free(logfilename);
437 if (confbase) free(confbase);
440 static bool drop_privs() {
443 logger(LOG_ERR, _("%s not supported on this platform"), "-U");
447 logger(LOG_ERR, _("%s not supported on this platform"), "-R");
453 struct passwd *pw = getpwnam(switchuser);
455 logger(LOG_ERR, _("unknown user `%s'"), switchuser);
459 if (initgroups(switchuser, pw->pw_gid) != 0 ||
460 setgid(pw->pw_gid) != 0) {
461 logger(LOG_ERR, _("System call `%s' failed: %s"),
462 "initgroups", strerror(errno));
469 tzset(); /* for proper timestamps in logs */
470 if (chroot(confbase) != 0 || chdir("/") != 0) {
471 logger(LOG_ERR, _("System call `%s' failed: %s"),
472 "chroot", strerror(errno));
476 confbase = xstrdup("");
479 if (setuid(uid) != 0) {
480 logger(LOG_ERR, _("System call `%s' failed: %s"),
481 "setuid", strerror(errno));
489 # define setpriority(level) SetPriorityClass(GetCurrentProcess(), level)
491 # define NORMAL_PRIORITY_CLASS 0
492 # define BELOW_NORMAL_PRIORITY_CLASS 10
493 # define HIGH_PRIORITY_CLASS -10
494 # define setpriority(level) nice(level)
497 int main(int argc, char **argv)
499 program_name = argv[0];
501 setlocale(LC_ALL, "");
502 bindtextdomain(PACKAGE, LOCALEDIR);
505 if(!parse_options(argc, argv))
511 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
512 VERSION, __DATE__, __TIME__, PROT_CURRENT);
513 printf(_("Copyright (C) 1998-2009 Ivo Timmermans, Guus Sliepen and others.\n"
514 "See the AUTHORS file for a complete list.\n\n"
515 "tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
516 "and you are welcome to redistribute it under certain conditions;\n"
517 "see the file COPYING for details.\n"));
528 return !kill_other(kill_tincd);
530 openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
534 init_configuration(&config_tree);
536 /* Slllluuuuuuurrrrp! */
538 RAND_load_file("/dev/urandom", 1024);
540 ENGINE_load_builtin_engines();
541 ENGINE_register_all_complete();
543 OpenSSL_add_all_algorithms();
546 read_server_config();
547 return !keygen(generate_keys);
550 if(!read_server_config())
553 if(lzo_init() != LZO_E_OK) {
554 logger(LOG_ERR, _("Error initializing LZO compressor!"));
559 if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
560 logger(LOG_ERR, _("System call `%s' failed: %s"), "WSAStartup", winerror(GetLastError()));
564 if(!do_detach || !init_service())
565 return main2(argc, argv);
570 int main2(int argc, char **argv)
572 InitializeCriticalSection(&mutex);
573 EnterCriticalSection(&mutex);
580 /* Lock all pages into memory if requested.
581 * This has to be done after daemon()/fork() so it works for child.
582 * No need to do that in parent as it's very short-lived. */
583 if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
584 logger(LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
590 /* Setup sockets and open device. */
595 /* Initiate all outgoing connections. */
597 try_outgoing_connections();
599 /* Change process priority */
603 if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
604 if(!strcasecmp(priority, "Normal"))
605 setpriority(NORMAL_PRIORITY_CLASS);
606 else if(!strcasecmp(priority, "Low"))
607 setpriority(BELOW_NORMAL_PRIORITY_CLASS);
608 else if(!strcasecmp(priority, "High"))
609 setpriority(HIGH_PRIORITY_CLASS);
611 logger(LOG_ERR, _("Invalid priority `%s`!"), priority);
616 /* drop privileges */
620 /* Start main loop. It only exits when tinc is killed. */
622 status = main_loop();
624 /* Shutdown properly. */
629 close_network_connections();
632 logger(LOG_NOTICE, _("Terminating"));
635 remove_pid(pidfilename);
640 CRYPTO_cleanup_all_ex_data();
644 exit_configuration(&config_tree);