2 tincd.c -- the main file for tincd
3 Copyright (C) 1998-2005 Ivo Timmermans
4 2000-2009 Guus Sliepen <guus@tinc-vpn.org>
5 2009 Michael Tokarev <mjt@tls.msk.ru>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License along
18 with this program; if not, write to the Free Software Foundation, Inc.,
19 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 /* Darwin (MacOS/X) needs the following definition... */
25 #ifndef _P1003_1B_VISIBLE
26 #define _P1003_1B_VISIBLE
29 #ifdef HAVE_SYS_MMAN_H
33 #include <openssl/rand.h>
34 #include <openssl/rsa.h>
35 #include <openssl/pem.h>
36 #include <openssl/evp.h>
37 #include <openssl/engine.h>
60 /* The name this program was run with. */
61 char *program_name = NULL;
63 /* If nonzero, display usage information and exit. */
64 bool show_help = false;
66 /* If nonzero, print the version on standard output and exit. */
67 bool show_version = false;
69 /* If nonzero, it will attempt to kill a running tincd and exit. */
72 /* If nonzero, generate public/private keypair for this host/net. */
73 int generate_keys = 0;
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 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 *pidfilename = NULL; /* pid file location */
92 char *logfilename = NULL; /* log file location */
93 char **g_argv; /* a copy of the cmdline arguments */
97 static struct option const long_options[] = {
98 {"config", required_argument, NULL, 'c'},
99 {"kill", optional_argument, NULL, 'k'},
100 {"net", required_argument, NULL, 'n'},
101 {"help", no_argument, NULL, 1},
102 {"version", no_argument, NULL, 2},
103 {"no-detach", no_argument, NULL, 'D'},
104 {"generate-keys", optional_argument, NULL, 'K'},
105 {"debug", optional_argument, NULL, 'd'},
106 {"bypass-security", no_argument, NULL, 3},
107 {"mlock", no_argument, NULL, 'L'},
108 {"chroot", no_argument, NULL, 'R'},
109 {"user", required_argument, NULL, 'U'},
110 {"logfile", optional_argument, NULL, 4},
111 {"pidfile", required_argument, NULL, 5},
116 static struct WSAData wsa_state;
117 CRITICAL_SECTION mutex;
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 " -k, --kill[=SIGNAL] Attempt to kill a running tincd and exit.\n"
130 " -n, --net=NETNAME Connect to net NETNAME.\n"
131 " -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
132 " -L, --mlock Lock tinc into main memory.\n"
133 " --logfile[=FILENAME] Write log entries to a logfile.\n"
134 " --pidfile=FILENAME Write PID to FILENAME.\n"
135 " -R, --chroot chroot to NET dir at startup.\n"
136 " -U, --user=USER setuid to given USER at startup.\n"
137 " --help Display this help and exit.\n"
138 " --version Output version information and exit.\n\n"));
139 printf(_("Report bugs to tinc@tinc-vpn.org.\n"));
143 static bool parse_options(int argc, char **argv) {
145 int option_index = 0;
147 while((r = getopt_long(argc, argv, "c:DLd::k::n:K::RU:", long_options, &option_index)) != EOF) {
149 case 0: /* long option */
152 case 'c': /* config file */
153 confbase = xstrdup(optarg);
156 case 'D': /* no detach */
160 case 'L': /* no detach */
161 #ifndef HAVE_MLOCKALL
162 logger(LOG_ERR, _("%s not supported on this platform"), "mlockall()");
169 case 'd': /* inc debug level */
171 debug_level = atoi(optarg);
176 case 'k': /* kill old tincds */
179 if(!strcasecmp(optarg, "HUP"))
181 else if(!strcasecmp(optarg, "TERM"))
182 kill_tincd = SIGTERM;
183 else if(!strcasecmp(optarg, "KILL"))
184 kill_tincd = SIGKILL;
185 else if(!strcasecmp(optarg, "USR1"))
186 kill_tincd = SIGUSR1;
187 else if(!strcasecmp(optarg, "USR2"))
188 kill_tincd = SIGUSR2;
189 else if(!strcasecmp(optarg, "WINCH"))
190 kill_tincd = SIGWINCH;
191 else if(!strcasecmp(optarg, "INT"))
193 else if(!strcasecmp(optarg, "ALRM"))
194 kill_tincd = SIGALRM;
196 kill_tincd = atoi(optarg);
199 fprintf(stderr, _("Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n"),
206 kill_tincd = SIGTERM;
212 case 'n': /* net name given */
213 netname = xstrdup(optarg);
216 case 'K': /* generate public/private keypair */
218 generate_keys = atoi(optarg);
220 if(generate_keys < 512) {
221 fprintf(stderr, _("Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n"),
227 generate_keys &= ~7; /* Round it to bytes */
229 generate_keys = 2048;
232 case 'R': /* chroot to NETNAME dir */
236 case 'U': /* setuid to USER */
240 case 1: /* show help */
244 case 2: /* show version */
248 case 3: /* bypass security */
249 bypass_security = true;
252 case 4: /* write log entries to a file */
255 logfilename = xstrdup(optarg);
258 case 5: /* write PID to a file */
259 pidfilename = xstrdup(optarg);
274 /* This function prettyprints the key generation process */
276 static void indicator(int a, int b, void *p) {
279 fprintf(stderr, ".");
283 fprintf(stderr, "+");
287 fprintf(stderr, "-");
293 fprintf(stderr, " p\n");
297 fprintf(stderr, " q\n");
301 fprintf(stderr, "?");
306 fprintf(stderr, "?");
311 Generate a public/private RSA keypair, and ask for a file to store
314 static bool keygen(int bits) {
320 get_config_string(lookup_config(config_tree, "Name"), &name);
322 if(name && !check_id(name)) {
323 fprintf(stderr, _("Invalid name for myself!\n"));
327 fprintf(stderr, _("Generating %d bits keys:\n"), bits);
328 rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
331 fprintf(stderr, _("Error during key generation!\n"));
334 fprintf(stderr, _("Done.\n"));
336 xasprintf(&filename, "%s/rsa_key.priv", confbase);
337 f = ask_and_open(filename, _("private RSA key"));
342 if(disable_old_keys(f))
343 fprintf(stderr, _("Warning: old key(s) found and disabled.\n"));
346 /* Make it unreadable for others. */
347 fchmod(fileno(f), 0600);
350 PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
355 xasprintf(&filename, "%s/hosts/%s", confbase, name);
357 xasprintf(&filename, "%s/rsa_key.pub", confbase);
359 f = ask_and_open(filename, _("public RSA key"));
364 if(disable_old_keys(f))
365 fprintf(stderr, _("Warning: old key(s) found and disabled.\n"));
367 PEM_write_RSAPublicKey(f, rsa_key);
377 Set all files and paths according to netname
379 static void make_names(void) {
382 char installdir[1024] = "";
383 long len = sizeof(installdir);
387 xasprintf(&identname, "tinc.%s", netname);
389 identname = xstrdup("tinc");
392 if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
393 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
395 xasprintf(&logfilename, "%s/log/%s.log", identname);
398 xasprintf(&confbase, "%s/%s", installdir, netname);
400 xasprintf(&confbase, "%s", installdir);
410 xasprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
413 xasprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
417 xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
419 logger(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
422 xasprintf(&confbase, CONFDIR "/tinc");
426 static void free_names() {
427 if (identname) free(identname);
428 if (netname) free(netname);
429 if (pidfilename) free(pidfilename);
430 if (logfilename) free(logfilename);
431 if (confbase) free(confbase);
434 static bool drop_privs() {
437 logger(LOG_ERR, _("%s not supported on this platform"), "-U");
441 logger(LOG_ERR, _("%s not supported on this platform"), "-R");
447 struct passwd *pw = getpwnam(switchuser);
449 logger(LOG_ERR, _("unknown user `%s'"), switchuser);
453 if (initgroups(switchuser, pw->pw_gid) != 0 ||
454 setgid(pw->pw_gid) != 0) {
455 logger(LOG_ERR, _("System call `%s' failed: %s"),
456 "initgroups", strerror(errno));
463 tzset(); /* for proper timestamps in logs */
464 if (chroot(confbase) != 0 || chdir("/") != 0) {
465 logger(LOG_ERR, _("System call `%s' failed: %s"),
466 "chroot", strerror(errno));
470 confbase = xstrdup("");
473 if (setuid(uid) != 0) {
474 logger(LOG_ERR, _("System call `%s' failed: %s"),
475 "setuid", strerror(errno));
483 # define setpriority(level) SetPriorityClass(GetCurrentProcess(), level)
485 # define NORMAL_PRIORITY_CLASS 0
486 # define BELOW_NORMAL_PRIORITY_CLASS 10
487 # define HIGH_PRIORITY_CLASS -10
488 # define setpriority(level) nice(level)
491 int main(int argc, char **argv) {
492 program_name = argv[0];
494 setlocale(LC_ALL, "");
495 bindtextdomain(PACKAGE, LOCALEDIR);
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) 1998-2009 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())
546 if(lzo_init() != LZO_E_OK) {
547 logger(LOG_ERR, _("Error initializing LZO compressor!"));
552 if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
553 logger(LOG_ERR, _("System call `%s' failed: %s"), "WSAStartup", winerror(GetLastError()));
557 if(!do_detach || !init_service())
558 return main2(argc, argv);
563 int main2(int argc, char **argv) {
564 InitializeCriticalSection(&mutex);
565 EnterCriticalSection(&mutex);
572 /* Lock all pages into memory if requested.
573 * This has to be done after daemon()/fork() so it works for child.
574 * No need to do that in parent as it's very short-lived. */
575 if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
576 logger(LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
582 /* Setup sockets and open device. */
587 /* Initiate all outgoing connections. */
589 try_outgoing_connections();
591 /* Change process priority */
595 if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
596 if(!strcasecmp(priority, "Normal"))
597 setpriority(NORMAL_PRIORITY_CLASS);
598 else if(!strcasecmp(priority, "Low"))
599 setpriority(BELOW_NORMAL_PRIORITY_CLASS);
600 else if(!strcasecmp(priority, "High"))
601 setpriority(HIGH_PRIORITY_CLASS);
603 logger(LOG_ERR, _("Invalid priority `%s`!"), priority);
608 /* drop privileges */
612 /* Start main loop. It only exits when tinc is killed. */
614 status = main_loop();
616 /* Shutdown properly. */
621 close_network_connections();
624 logger(LOG_NOTICE, _("Terminating"));
627 remove_pid(pidfilename);
632 CRYPTO_cleanup_all_ex_data();
636 exit_configuration(&config_tree);