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>
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>
65 /* The name this program was run with. */
66 char *program_name = NULL;
68 /* If nonzero, display usage information and exit. */
69 bool show_help = false;
71 /* If nonzero, print the version on standard output and exit. */
72 bool show_version = false;
74 /* If nonzero, it will attempt to kill a running tincd and exit. */
77 /* If nonzero, generate public/private keypair for this host/net. */
78 int generate_keys = 0;
80 /* If nonzero, use null ciphers and skip all key exchanges. */
81 bool bypass_security = false;
83 /* If nonzero, disable swapping for this process. */
84 bool do_mlock = false;
86 /* If nonzero, chroot to netdir after startup. */
87 static bool do_chroot = false;
89 /* If !NULL, do setuid to given user after startup */
90 static const char *switchuser = NULL;
92 /* If nonzero, write log entries to a separate file. */
93 bool use_logfile = false;
95 char *identname = NULL; /* program name for syslog */
96 char *pidfilename = NULL; /* pid file location */
97 char *logfilename = NULL; /* log file location */
98 char **g_argv; /* a copy of the cmdline arguments */
102 static struct option const long_options[] = {
103 {"config", required_argument, NULL, 'c'},
104 {"kill", optional_argument, NULL, 'k'},
105 {"net", required_argument, NULL, 'n'},
106 {"help", no_argument, NULL, 1},
107 {"version", no_argument, NULL, 2},
108 {"no-detach", no_argument, NULL, 'D'},
109 {"generate-keys", optional_argument, NULL, 'K'},
110 {"debug", optional_argument, NULL, 'd'},
111 {"bypass-security", no_argument, NULL, 3},
112 {"mlock", no_argument, NULL, 'L'},
113 {"chroot", no_argument, NULL, 'R'},
114 {"user", required_argument, NULL, 'U'},
115 {"logfile", optional_argument, NULL, 4},
116 {"pidfile", required_argument, NULL, 5},
121 static struct WSAData wsa_state;
122 CRITICAL_SECTION mutex;
123 int main2(int argc, char **argv);
126 static void usage(bool status) {
128 fprintf(stderr, "Try `%s --help\' for more information.\n",
131 printf("Usage: %s [option]...\n\n", program_name);
132 printf(" -c, --config=DIR Read configuration options from DIR.\n"
133 " -D, --no-detach Don't fork and detach.\n"
134 " -d, --debug[=LEVEL] Increase debug level or set it to LEVEL.\n"
135 " -k, --kill[=SIGNAL] Attempt to kill a running tincd and exit.\n"
136 " -n, --net=NETNAME Connect to net NETNAME.\n"
137 " -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
138 " -L, --mlock Lock tinc into main memory.\n"
139 " --logfile[=FILENAME] Write log entries to a logfile.\n"
140 " --pidfile=FILENAME Write PID to FILENAME.\n"
141 " -o [HOST.]KEY=VALUE Set global/host configuration value.\n"
142 " -R, --chroot chroot to NET dir at startup.\n"
143 " -U, --user=USER setuid to given USER at startup.\n"
144 " --help Display this help and exit.\n"
145 " --version Output version information and exit.\n\n");
146 printf("Report bugs to tinc@tinc-vpn.org.\n");
150 static bool parse_options(int argc, char **argv) {
153 int option_index = 0;
156 cmdline_conf = list_alloc((list_action_t)free_config);
158 while((r = getopt_long(argc, argv, "c:DLd::k::n:o:K::RU:", long_options, &option_index)) != EOF) {
160 case 0: /* long option */
163 case 'c': /* config file */
164 confbase = xstrdup(optarg);
167 case 'D': /* no detach */
171 case 'L': /* no detach */
172 #ifndef HAVE_MLOCKALL
173 logger(LOG_ERR, "%s not supported on this platform", "mlockall()");
180 case 'd': /* inc debug level */
182 debug_level = atoi(optarg);
187 case 'k': /* kill old tincds */
190 if(!strcasecmp(optarg, "HUP"))
192 else if(!strcasecmp(optarg, "TERM"))
193 kill_tincd = SIGTERM;
194 else if(!strcasecmp(optarg, "KILL"))
195 kill_tincd = SIGKILL;
196 else if(!strcasecmp(optarg, "USR1"))
197 kill_tincd = SIGUSR1;
198 else if(!strcasecmp(optarg, "USR2"))
199 kill_tincd = SIGUSR2;
200 else if(!strcasecmp(optarg, "WINCH"))
201 kill_tincd = SIGWINCH;
202 else if(!strcasecmp(optarg, "INT"))
204 else if(!strcasecmp(optarg, "ALRM"))
205 kill_tincd = SIGALRM;
207 kill_tincd = atoi(optarg);
210 fprintf(stderr, "Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n",
217 kill_tincd = SIGTERM;
223 case 'n': /* net name given */
224 /* netname "." is special: a "top-level name" */
225 netname = strcmp(optarg, ".") != 0 ?
226 xstrdup(optarg) : NULL;
229 case 'o': /* option */
230 cfg = parse_config_line(optarg, NULL, ++lineno);
233 list_insert_tail(cmdline_conf, cfg);
236 case 'K': /* generate public/private keypair */
238 generate_keys = atoi(optarg);
240 if(generate_keys < 512) {
241 fprintf(stderr, "Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n",
247 generate_keys &= ~7; /* Round it to bytes */
249 generate_keys = 2048;
252 case 'R': /* chroot to NETNAME dir */
256 case 'U': /* setuid to USER */
260 case 1: /* show help */
264 case 2: /* show version */
268 case 3: /* bypass security */
269 bypass_security = true;
272 case 4: /* write log entries to a file */
275 logfilename = xstrdup(optarg);
278 case 5: /* write PID to a file */
279 pidfilename = xstrdup(optarg);
294 /* This function prettyprints the key generation process */
296 static void indicator(int a, int b, void *p) {
299 fprintf(stderr, ".");
303 fprintf(stderr, "+");
307 fprintf(stderr, "-");
313 fprintf(stderr, " p\n");
317 fprintf(stderr, " q\n");
321 fprintf(stderr, "?");
326 fprintf(stderr, "?");
331 Generate a public/private RSA keypair, and ask for a file to store
334 static bool keygen(int bits) {
340 get_config_string(lookup_config(config_tree, "Name"), &name);
342 if(name && !check_id(name)) {
343 fprintf(stderr, "Invalid name for myself!\n");
347 fprintf(stderr, "Generating %d bits keys:\n", bits);
348 rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
351 fprintf(stderr, "Error during key generation!\n");
354 fprintf(stderr, "Done.\n");
356 xasprintf(&filename, "%s/rsa_key.priv", confbase);
357 f = ask_and_open(filename, "private RSA key");
362 if(disable_old_keys(f))
363 fprintf(stderr, "Warning: old key(s) found and disabled.\n");
366 /* Make it unreadable for others. */
367 fchmod(fileno(f), 0600);
371 PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
376 xasprintf(&filename, "%s/hosts/%s", confbase, name);
378 xasprintf(&filename, "%s/rsa_key.pub", confbase);
380 f = ask_and_open(filename, "public RSA key");
385 if(disable_old_keys(f))
386 fprintf(stderr, "Warning: old key(s) found and disabled.\n");
389 PEM_write_RSAPublicKey(f, rsa_key);
399 Set all files and paths according to netname
401 static void make_names(void) {
404 char installdir[1024] = "";
405 long len = sizeof(installdir);
409 xasprintf(&identname, "tinc.%s", netname);
411 identname = xstrdup("tinc");
414 if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
415 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
417 xasprintf(&logfilename, "%s/log/%s.log", identname);
420 xasprintf(&confbase, "%s/%s", installdir, netname);
422 xasprintf(&confbase, "%s", installdir);
432 xasprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
435 xasprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
439 xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
441 logger(LOG_INFO, "Both netname and configuration directory given, using the latter...");
444 xasprintf(&confbase, CONFDIR "/tinc");
448 static void free_names() {
449 if (identname) free(identname);
450 if (netname) free(netname);
451 if (pidfilename) free(pidfilename);
452 if (logfilename) free(logfilename);
453 if (confbase) free(confbase);
456 static bool drop_privs() {
459 logger(LOG_ERR, "%s not supported on this platform", "-U");
463 logger(LOG_ERR, "%s not supported on this platform", "-R");
469 struct passwd *pw = getpwnam(switchuser);
471 logger(LOG_ERR, "unknown user `%s'", switchuser);
475 if (initgroups(switchuser, pw->pw_gid) != 0 ||
476 setgid(pw->pw_gid) != 0) {
477 logger(LOG_ERR, "System call `%s' failed: %s",
478 "initgroups", strerror(errno));
485 tzset(); /* for proper timestamps in logs */
486 if (chroot(confbase) != 0 || chdir("/") != 0) {
487 logger(LOG_ERR, "System call `%s' failed: %s",
488 "chroot", strerror(errno));
492 confbase = xstrdup("");
495 if (setuid(uid) != 0) {
496 logger(LOG_ERR, "System call `%s' failed: %s",
497 "setuid", strerror(errno));
505 # define setpriority(level) SetPriorityClass(GetCurrentProcess(), level)
507 # define NORMAL_PRIORITY_CLASS 0
508 # define BELOW_NORMAL_PRIORITY_CLASS 10
509 # define HIGH_PRIORITY_CLASS -10
510 # define setpriority(level) nice(level)
513 int main(int argc, char **argv) {
514 program_name = argv[0];
516 if(!parse_options(argc, argv))
522 printf("%s version %s (built %s %s, protocol %d)\n", PACKAGE,
523 VERSION, __DATE__, __TIME__, PROT_CURRENT);
524 printf("Copyright (C) 1998-2010 Ivo Timmermans, Guus Sliepen and others.\n"
525 "See the AUTHORS file for a complete list.\n\n"
526 "tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
527 "and you are welcome to redistribute it under certain conditions;\n"
528 "see the file COPYING for details.\n");
539 return !kill_other(kill_tincd);
541 openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
545 init_configuration(&config_tree);
547 /* Slllluuuuuuurrrrp! */
549 RAND_load_file("/dev/urandom", 1024);
551 ENGINE_load_builtin_engines();
552 ENGINE_register_all_complete();
554 OpenSSL_add_all_algorithms();
557 read_server_config();
558 return !keygen(generate_keys);
561 if(!read_server_config())
565 if(lzo_init() != LZO_E_OK) {
566 logger(LOG_ERR, "Error initializing LZO compressor!");
572 if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
573 logger(LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
577 if(!do_detach || !init_service())
578 return main2(argc, argv);
583 int main2(int argc, char **argv) {
584 InitializeCriticalSection(&mutex);
585 EnterCriticalSection(&mutex);
592 /* Lock all pages into memory if requested.
593 * This has to be done after daemon()/fork() so it works for child.
594 * No need to do that in parent as it's very short-lived. */
595 if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
596 logger(LOG_ERR, "System call `%s' failed: %s", "mlockall",
602 /* Setup sockets and open device. */
607 /* Initiate all outgoing connections. */
609 try_outgoing_connections();
611 /* Change process priority */
615 if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
616 if(!strcasecmp(priority, "Normal")) {
617 if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
618 logger(LOG_ERR, "System call `%s' failed: %s",
619 "setpriority", strerror(errno));
622 } else if(!strcasecmp(priority, "Low")) {
623 if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
624 logger(LOG_ERR, "System call `%s' failed: %s",
625 "setpriority", strerror(errno));
628 } else if(!strcasecmp(priority, "High")) {
629 if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
630 logger(LOG_ERR, "System call `%s' failed: %s",
631 "setpriority", strerror(errno));
635 logger(LOG_ERR, "Invalid priority `%s`!", priority);
640 /* drop privileges */
644 /* Start main loop. It only exits when tinc is killed. */
646 status = main_loop();
648 /* Shutdown properly. */
653 close_network_connections();
656 logger(LOG_NOTICE, "Terminating");
659 remove_pid(pidfilename);
664 CRYPTO_cleanup_all_ex_data();
668 exit_configuration(&config_tree);