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;
120 static void usage(bool status)
123 fprintf(stderr, _("Try `%s --help\' for more information.\n"),
126 printf(_("Usage: %s [option]...\n\n"), program_name);
127 printf(_(" -c, --config=DIR Read configuration options from DIR.\n"
128 " -D, --no-detach Don't fork and detach.\n"
129 " -d, --debug[=LEVEL] Increase debug level or set it to LEVEL.\n"
130 " -k, --kill[=SIGNAL] Attempt to kill a running tincd and exit.\n"
131 " -n, --net=NETNAME Connect to net NETNAME.\n"
132 " -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
133 " -L, --mlock Lock tinc into main memory.\n"
134 " --logfile[=FILENAME] Write log entries to a logfile.\n"
135 " --pidfile=FILENAME Write PID to FILENAME.\n"
136 " -R, --chroot chroot to NET dir at startup.\n"
137 " -U, --user=USER setuid to given USER at startup.\n"
138 " --help Display this help and exit.\n"
139 " --version Output version information and exit.\n\n"));
140 printf(_("Report bugs to tinc@tinc-vpn.org.\n"));
144 static bool parse_options(int argc, char **argv)
147 int option_index = 0;
149 while((r = getopt_long(argc, argv, "c:DLd::k::n:K::RU:", long_options, &option_index)) != EOF) {
151 case 0: /* long option */
154 case 'c': /* config file */
155 confbase = xstrdup(optarg);
158 case 'D': /* no detach */
162 case 'L': /* no detach */
166 case 'd': /* inc debug level */
168 debug_level = atoi(optarg);
173 case 'k': /* kill old tincds */
176 if(!strcasecmp(optarg, "HUP"))
178 else if(!strcasecmp(optarg, "TERM"))
179 kill_tincd = SIGTERM;
180 else if(!strcasecmp(optarg, "KILL"))
181 kill_tincd = SIGKILL;
182 else if(!strcasecmp(optarg, "USR1"))
183 kill_tincd = SIGUSR1;
184 else if(!strcasecmp(optarg, "USR2"))
185 kill_tincd = SIGUSR2;
186 else if(!strcasecmp(optarg, "WINCH"))
187 kill_tincd = SIGWINCH;
188 else if(!strcasecmp(optarg, "INT"))
190 else if(!strcasecmp(optarg, "ALRM"))
191 kill_tincd = SIGALRM;
193 kill_tincd = atoi(optarg);
196 fprintf(stderr, _("Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n"),
203 kill_tincd = SIGTERM;
209 case 'n': /* net name given */
210 netname = xstrdup(optarg);
213 case 'K': /* generate public/private keypair */
215 generate_keys = atoi(optarg);
217 if(generate_keys < 512) {
218 fprintf(stderr, _("Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n"),
224 generate_keys &= ~7; /* Round it to bytes */
226 generate_keys = 1024;
229 case 'R': /* chroot to NETNAME dir */
233 case 'U': /* setuid to USER */
237 case 1: /* show help */
241 case 2: /* show version */
245 case 3: /* bypass security */
246 bypass_security = true;
249 case 4: /* write log entries to a file */
252 logfilename = xstrdup(optarg);
255 case 5: /* write PID to a file */
256 pidfilename = xstrdup(optarg);
271 /* This function prettyprints the key generation process */
273 static void indicator(int a, int b, void *p)
277 fprintf(stderr, ".");
281 fprintf(stderr, "+");
285 fprintf(stderr, "-");
291 fprintf(stderr, " p\n");
295 fprintf(stderr, " q\n");
299 fprintf(stderr, "?");
304 fprintf(stderr, "?");
309 Generate a public/private RSA keypair, and ask for a file to store
312 static bool keygen(int bits)
319 get_config_string(lookup_config(config_tree, "Name"), &name);
321 if(name && !check_id(name)) {
322 fprintf(stderr, _("Invalid name for myself!\n"));
326 fprintf(stderr, _("Generating %d bits keys:\n"), bits);
327 rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
330 fprintf(stderr, _("Error during key generation!\n"));
333 fprintf(stderr, _("Done.\n"));
335 asprintf(&filename, "%s/rsa_key.priv", confbase);
336 f = ask_and_open(filename, _("private RSA key"));
341 if(disable_old_keys(f))
342 fprintf(stderr, _("Warning: old key(s) found and disabled.\n"));
345 /* Make it unreadable for others. */
346 fchmod(fileno(f), 0600);
349 PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
354 asprintf(&filename, "%s/hosts/%s", confbase, name);
356 asprintf(&filename, "%s/rsa_key.pub", confbase);
358 f = ask_and_open(filename, _("public RSA key"));
363 if(disable_old_keys(f))
364 fprintf(stderr, _("Warning: old key(s) found and disabled.\n"));
366 PEM_write_RSAPublicKey(f, rsa_key);
376 Set all files and paths according to netname
378 static void make_names(void)
382 char installdir[1024] = "";
383 long len = sizeof(installdir);
387 asprintf(&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 asprintf(&logfilename, "%s/log/%s.log", identname);
398 asprintf(&confbase, "%s/%s", installdir, netname);
400 asprintf(&confbase, "%s", installdir);
410 asprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
413 asprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
417 asprintf(&confbase, CONFDIR "/tinc/%s", netname);
419 logger(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
422 asprintf(&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, _("%s failed"), "initgroups()");
462 tzset(); /* for proper timestamps in logs */
463 if (chroot(confbase) != 0 || chdir(".") != 0) {
464 logger(LOG_ERR, _("%s failed"), "chroot()");
468 confbase = xstrdup("");
471 if (setuid(uid) != 0) {
472 logger(LOG_ERR, _("%s failed"), "setuid()");
479 int main(int argc, char **argv)
481 program_name = argv[0];
483 setlocale(LC_ALL, "");
484 bindtextdomain(PACKAGE, LOCALEDIR);
487 if(!parse_options(argc, argv))
493 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
494 VERSION, __DATE__, __TIME__, PROT_CURRENT);
495 printf(_("Copyright (C) 1998-2009 Ivo Timmermans, Guus Sliepen and others.\n"
496 "See the AUTHORS file for a complete list.\n\n"
497 "tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
498 "and you are welcome to redistribute it under certain conditions;\n"
499 "see the file COPYING for details.\n"));
510 return !kill_other(kill_tincd);
512 openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
514 /* Lock all pages into memory if requested */
518 if(mlockall(MCL_CURRENT | MCL_FUTURE)) {
519 logger(LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
523 logger(LOG_ERR, _("mlockall() not supported on this platform!"));
530 init_configuration(&config_tree);
532 /* Slllluuuuuuurrrrp! */
534 RAND_load_file("/dev/urandom", 1024);
536 ENGINE_load_builtin_engines();
537 ENGINE_register_all_complete();
539 OpenSSL_add_all_algorithms();
542 read_server_config();
543 return !keygen(generate_keys);
546 if(!read_server_config())
549 if(lzo_init() != LZO_E_OK) {
550 logger(LOG_ERR, _("Error initializing LZO compressor!"));
555 if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
556 logger(LOG_ERR, _("System call `%s' failed: %s"), "WSAStartup", winerror(GetLastError()));
560 if(!do_detach || !init_service())
561 return main2(argc, argv);
566 int main2(int argc, char **argv)
573 /* Setup sockets and open device. */
578 /* drop privileges */
582 /* Initiate all outgoing connections. */
584 try_outgoing_connections();
586 /* Start main loop. It only exits when tinc is killed. */
588 status = main_loop();
590 /* Shutdown properly. */
595 close_network_connections();
598 logger(LOG_NOTICE, _("Terminating"));
601 remove_pid(pidfilename);
606 CRYPTO_cleanup_all_ex_data();
610 exit_configuration(&config_tree);