2 tincd.c -- the main file for tincd
3 Copyright (C) 1998-2005 Ivo Timmermans
4 2000-2010 Guus Sliepen <guus@tinc-vpn.org>
5 2008 Max Rijevski <maksuf@gmail.com>
6 2009 Michael Tokarev <mjt@tls.msk.ru>
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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>
63 /* The name this program was run with. */
64 char *program_name = NULL;
66 /* If nonzero, display usage information and exit. */
67 bool show_help = false;
69 /* If nonzero, print the version on standard output and exit. */
70 bool show_version = false;
72 /* If nonzero, it will attempt to kill a running tincd and exit. */
75 /* If nonzero, generate public/private keypair for this host/net. */
76 int generate_keys = 0;
78 /* If nonzero, use null ciphers and skip all key exchanges. */
79 bool bypass_security = false;
81 /* If nonzero, disable swapping for this process. */
82 bool do_mlock = false;
84 /* If nonzero, chroot to netdir after startup. */
85 static bool do_chroot = false;
87 /* If !NULL, do setuid to given user after startup */
88 static const char *switchuser = NULL;
90 /* If nonzero, write log entries to a separate file. */
91 bool use_logfile = false;
93 char *identname = NULL; /* program name for syslog */
94 char *pidfilename = NULL; /* pid file location */
95 char *logfilename = NULL; /* log file location */
96 char **g_argv; /* a copy of the cmdline arguments */
100 static struct option const long_options[] = {
101 {"config", required_argument, NULL, 'c'},
102 {"kill", optional_argument, NULL, 'k'},
103 {"net", required_argument, NULL, 'n'},
104 {"help", no_argument, NULL, 1},
105 {"version", no_argument, NULL, 2},
106 {"no-detach", no_argument, NULL, 'D'},
107 {"generate-keys", optional_argument, NULL, 'K'},
108 {"debug", optional_argument, NULL, 'd'},
109 {"bypass-security", no_argument, NULL, 3},
110 {"mlock", no_argument, NULL, 'L'},
111 {"chroot", no_argument, NULL, 'R'},
112 {"user", required_argument, NULL, 'U'},
113 {"logfile", optional_argument, NULL, 4},
114 {"pidfile", required_argument, NULL, 5},
119 static struct WSAData wsa_state;
120 CRITICAL_SECTION mutex;
121 int main2(int argc, char **argv);
124 static void usage(bool status) {
126 fprintf(stderr, "Try `%s --help\' for more information.\n",
129 printf("Usage: %s [option]...\n\n", program_name);
130 printf(" -c, --config=DIR Read configuration options from DIR.\n"
131 " -D, --no-detach Don't fork and detach.\n"
132 " -d, --debug[=LEVEL] Increase debug level or set it to LEVEL.\n"
133 " -k, --kill[=SIGNAL] Attempt to kill a running tincd and exit.\n"
134 " -n, --net=NETNAME Connect to net NETNAME.\n"
135 " -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
136 " -L, --mlock Lock tinc into main memory.\n"
137 " --logfile[=FILENAME] Write log entries to a logfile.\n"
138 " --pidfile=FILENAME Write PID to FILENAME.\n"
139 " -R, --chroot chroot to NET dir at startup.\n"
140 " -U, --user=USER setuid to given USER at startup.\n"
141 " --help Display this help and exit.\n"
142 " --version Output version information and exit.\n\n");
143 printf("Report bugs to tinc@tinc-vpn.org.\n");
147 static bool parse_options(int argc, char **argv) {
149 int option_index = 0;
151 while((r = getopt_long(argc, argv, "c:DLd::k::n:K::RU:", long_options, &option_index)) != EOF) {
153 case 0: /* long option */
156 case 'c': /* config file */
157 confbase = xstrdup(optarg);
160 case 'D': /* no detach */
164 case 'L': /* no detach */
165 #ifndef HAVE_MLOCKALL
166 logger(LOG_ERR, "%s not supported on this platform", "mlockall()");
173 case 'd': /* inc debug level */
175 debug_level = atoi(optarg);
180 case 'k': /* kill old tincds */
183 if(!strcasecmp(optarg, "HUP"))
185 else if(!strcasecmp(optarg, "TERM"))
186 kill_tincd = SIGTERM;
187 else if(!strcasecmp(optarg, "KILL"))
188 kill_tincd = SIGKILL;
189 else if(!strcasecmp(optarg, "USR1"))
190 kill_tincd = SIGUSR1;
191 else if(!strcasecmp(optarg, "USR2"))
192 kill_tincd = SIGUSR2;
193 else if(!strcasecmp(optarg, "WINCH"))
194 kill_tincd = SIGWINCH;
195 else if(!strcasecmp(optarg, "INT"))
197 else if(!strcasecmp(optarg, "ALRM"))
198 kill_tincd = SIGALRM;
200 kill_tincd = atoi(optarg);
203 fprintf(stderr, "Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n",
210 kill_tincd = SIGTERM;
216 case 'n': /* net name given */
217 netname = xstrdup(optarg);
220 case 'K': /* generate public/private keypair */
222 generate_keys = atoi(optarg);
224 if(generate_keys < 512) {
225 fprintf(stderr, "Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n",
231 generate_keys &= ~7; /* Round it to bytes */
233 generate_keys = 2048;
236 case 'R': /* chroot to NETNAME dir */
240 case 'U': /* setuid to USER */
244 case 1: /* show help */
248 case 2: /* show version */
252 case 3: /* bypass security */
253 bypass_security = true;
256 case 4: /* write log entries to a file */
259 logfilename = xstrdup(optarg);
262 case 5: /* write PID to a file */
263 pidfilename = xstrdup(optarg);
278 /* This function prettyprints the key generation process */
280 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) {
324 get_config_string(lookup_config(config_tree, "Name"), &name);
326 if(name && !check_id(name)) {
327 fprintf(stderr, "Invalid name for myself!\n");
331 fprintf(stderr, "Generating %d bits keys:\n", bits);
332 rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
335 fprintf(stderr, "Error during key generation!\n");
338 fprintf(stderr, "Done.\n");
340 xasprintf(&filename, "%s/rsa_key.priv", confbase);
341 f = ask_and_open(filename, "private RSA key");
346 if(disable_old_keys(f))
347 fprintf(stderr, "Warning: old key(s) found and disabled.\n");
350 /* Make it unreadable for others. */
351 fchmod(fileno(f), 0600);
354 PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
359 xasprintf(&filename, "%s/hosts/%s", confbase, name);
361 xasprintf(&filename, "%s/rsa_key.pub", confbase);
363 f = ask_and_open(filename, "public RSA key");
368 if(disable_old_keys(f))
369 fprintf(stderr, "Warning: old key(s) found and disabled.\n");
371 PEM_write_RSAPublicKey(f, rsa_key);
381 Set all files and paths according to netname
383 static void make_names(void) {
386 char installdir[1024] = "";
387 long len = sizeof(installdir);
391 xasprintf(&identname, "tinc.%s", netname);
393 identname = xstrdup("tinc");
396 if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
397 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
399 xasprintf(&logfilename, "%s/log/%s.log", identname);
402 xasprintf(&confbase, "%s/%s", installdir, netname);
404 xasprintf(&confbase, "%s", installdir);
414 xasprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
417 xasprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
421 xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
423 logger(LOG_INFO, "Both netname and configuration directory given, using the latter...");
426 xasprintf(&confbase, CONFDIR "/tinc");
430 static void free_names() {
431 if (identname) free(identname);
432 if (netname) free(netname);
433 if (pidfilename) free(pidfilename);
434 if (logfilename) free(logfilename);
435 if (confbase) free(confbase);
438 static bool drop_privs() {
441 logger(LOG_ERR, "%s not supported on this platform", "-U");
445 logger(LOG_ERR, "%s not supported on this platform", "-R");
451 struct passwd *pw = getpwnam(switchuser);
453 logger(LOG_ERR, "unknown user `%s'", switchuser);
457 if (initgroups(switchuser, pw->pw_gid) != 0 ||
458 setgid(pw->pw_gid) != 0) {
459 logger(LOG_ERR, "System call `%s' failed: %s",
460 "initgroups", strerror(errno));
467 tzset(); /* for proper timestamps in logs */
468 if (chroot(confbase) != 0 || chdir("/") != 0) {
469 logger(LOG_ERR, "System call `%s' failed: %s",
470 "chroot", strerror(errno));
474 confbase = xstrdup("");
477 if (setuid(uid) != 0) {
478 logger(LOG_ERR, "System call `%s' failed: %s",
479 "setuid", strerror(errno));
487 # define setpriority(level) SetPriorityClass(GetCurrentProcess(), level)
489 # define NORMAL_PRIORITY_CLASS 0
490 # define BELOW_NORMAL_PRIORITY_CLASS 10
491 # define HIGH_PRIORITY_CLASS -10
492 # define setpriority(level) nice(level)
495 int main(int argc, char **argv) {
496 program_name = argv[0];
498 if(!parse_options(argc, argv))
504 printf("%s version %s (built %s %s, protocol %d)\n", PACKAGE,
505 VERSION, __DATE__, __TIME__, PROT_CURRENT);
506 printf("Copyright (C) 1998-2010 Ivo Timmermans, Guus Sliepen and others.\n"
507 "See the AUTHORS file for a complete list.\n\n"
508 "tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
509 "and you are welcome to redistribute it under certain conditions;\n"
510 "see the file COPYING for details.\n");
521 return !kill_other(kill_tincd);
523 openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
527 init_configuration(&config_tree);
529 /* Slllluuuuuuurrrrp! */
531 RAND_load_file("/dev/urandom", 1024);
533 ENGINE_load_builtin_engines();
534 ENGINE_register_all_complete();
536 OpenSSL_add_all_algorithms();
539 read_server_config();
540 return !keygen(generate_keys);
543 if(!read_server_config())
547 if(lzo_init() != LZO_E_OK) {
548 logger(LOG_ERR, "Error initializing LZO compressor!");
554 if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
555 logger(LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
559 if(!do_detach || !init_service())
560 return main2(argc, argv);
565 int main2(int argc, char **argv) {
566 InitializeCriticalSection(&mutex);
567 EnterCriticalSection(&mutex);
574 /* Lock all pages into memory if requested.
575 * This has to be done after daemon()/fork() so it works for child.
576 * No need to do that in parent as it's very short-lived. */
577 if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
578 logger(LOG_ERR, "System call `%s' failed: %s", "mlockall",
584 /* Setup sockets and open device. */
589 /* Initiate all outgoing connections. */
591 try_outgoing_connections();
593 /* Change process priority */
597 if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
598 if(!strcasecmp(priority, "Normal")) {
599 if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
600 logger(LOG_ERR, "System call `%s' failed: %s",
601 "setpriority", strerror(errno));
604 } else if(!strcasecmp(priority, "Low")) {
605 if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
606 logger(LOG_ERR, "System call `%s' failed: %s",
607 "setpriority", strerror(errno));
610 } else if(!strcasecmp(priority, "High")) {
611 if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
612 logger(LOG_ERR, "System call `%s' failed: %s",
613 "setpriority", strerror(errno));
617 logger(LOG_ERR, "Invalid priority `%s`!", priority);
622 /* drop privileges */
626 /* Start main loop. It only exits when tinc is killed. */
628 status = main_loop();
630 /* Shutdown properly. */
635 close_network_connections();
638 logger(LOG_NOTICE, "Terminating");
641 remove_pid(pidfilename);
646 CRYPTO_cleanup_all_ex_data();
650 exit_configuration(&config_tree);