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 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>
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) {
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) {
146 int option_index = 0;
148 while((r = getopt_long(argc, argv, "c:DLd::k::n:K::RU:", long_options, &option_index)) != EOF) {
150 case 0: /* long option */
153 case 'c': /* config file */
154 confbase = xstrdup(optarg);
157 case 'D': /* no detach */
161 case 'L': /* no detach */
162 #ifndef HAVE_MLOCKALL
163 logger(LOG_ERR, "%s not supported on this platform", "mlockall()");
170 case 'd': /* inc debug level */
172 debug_level = atoi(optarg);
177 case 'k': /* kill old tincds */
180 if(!strcasecmp(optarg, "HUP"))
182 else if(!strcasecmp(optarg, "TERM"))
183 kill_tincd = SIGTERM;
184 else if(!strcasecmp(optarg, "KILL"))
185 kill_tincd = SIGKILL;
186 else if(!strcasecmp(optarg, "USR1"))
187 kill_tincd = SIGUSR1;
188 else if(!strcasecmp(optarg, "USR2"))
189 kill_tincd = SIGUSR2;
190 else if(!strcasecmp(optarg, "WINCH"))
191 kill_tincd = SIGWINCH;
192 else if(!strcasecmp(optarg, "INT"))
194 else if(!strcasecmp(optarg, "ALRM"))
195 kill_tincd = SIGALRM;
197 kill_tincd = atoi(optarg);
200 fprintf(stderr, "Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n",
207 kill_tincd = SIGTERM;
213 case 'n': /* net name given */
214 netname = xstrdup(optarg);
217 case 'K': /* generate public/private keypair */
219 generate_keys = atoi(optarg);
221 if(generate_keys < 512) {
222 fprintf(stderr, "Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n",
228 generate_keys &= ~7; /* Round it to bytes */
230 generate_keys = 2048;
233 case 'R': /* chroot to NETNAME dir */
237 case 'U': /* setuid to USER */
241 case 1: /* show help */
245 case 2: /* show version */
249 case 3: /* bypass security */
250 bypass_security = true;
253 case 4: /* write log entries to a file */
256 logfilename = xstrdup(optarg);
259 case 5: /* write PID to a file */
260 pidfilename = xstrdup(optarg);
275 /* This function prettyprints the key generation process */
277 static void indicator(int a, int b, void *p) {
280 fprintf(stderr, ".");
284 fprintf(stderr, "+");
288 fprintf(stderr, "-");
294 fprintf(stderr, " p\n");
298 fprintf(stderr, " q\n");
302 fprintf(stderr, "?");
307 fprintf(stderr, "?");
312 Generate a public/private RSA keypair, and ask for a file to store
315 static bool keygen(int bits) {
321 get_config_string(lookup_config(config_tree, "Name"), &name);
323 if(name && !check_id(name)) {
324 fprintf(stderr, "Invalid name for myself!\n");
328 fprintf(stderr, "Generating %d bits keys:\n", bits);
329 rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
332 fprintf(stderr, "Error during key generation!\n");
335 fprintf(stderr, "Done.\n");
337 xasprintf(&filename, "%s/rsa_key.priv", confbase);
338 f = ask_and_open(filename, "private RSA key");
343 if(disable_old_keys(f))
344 fprintf(stderr, "Warning: old key(s) found and disabled.\n");
347 /* Make it unreadable for others. */
348 fchmod(fileno(f), 0600);
351 PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
356 xasprintf(&filename, "%s/hosts/%s", confbase, name);
358 xasprintf(&filename, "%s/rsa_key.pub", confbase);
360 f = ask_and_open(filename, "public RSA key");
365 if(disable_old_keys(f))
366 fprintf(stderr, "Warning: old key(s) found and disabled.\n");
368 PEM_write_RSAPublicKey(f, rsa_key);
378 Set all files and paths according to netname
380 static void make_names(void) {
383 char installdir[1024] = "";
384 long len = sizeof(installdir);
388 xasprintf(&identname, "tinc.%s", netname);
390 identname = xstrdup("tinc");
393 if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
394 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
396 xasprintf(&logfilename, "%s/log/%s.log", identname);
399 xasprintf(&confbase, "%s/%s", installdir, netname);
401 xasprintf(&confbase, "%s", installdir);
411 xasprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
414 xasprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
418 xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
420 logger(LOG_INFO, "Both netname and configuration directory given, using the latter...");
423 xasprintf(&confbase, CONFDIR "/tinc");
427 static void free_names() {
428 if (identname) free(identname);
429 if (netname) free(netname);
430 if (pidfilename) free(pidfilename);
431 if (logfilename) free(logfilename);
432 if (confbase) free(confbase);
435 static bool drop_privs() {
438 logger(LOG_ERR, "%s not supported on this platform", "-U");
442 logger(LOG_ERR, "%s not supported on this platform", "-R");
448 struct passwd *pw = getpwnam(switchuser);
450 logger(LOG_ERR, "unknown user `%s'", switchuser);
454 if (initgroups(switchuser, pw->pw_gid) != 0 ||
455 setgid(pw->pw_gid) != 0) {
456 logger(LOG_ERR, "System call `%s' failed: %s",
457 "initgroups", strerror(errno));
464 tzset(); /* for proper timestamps in logs */
465 if (chroot(confbase) != 0 || chdir("/") != 0) {
466 logger(LOG_ERR, "System call `%s' failed: %s",
467 "chroot", strerror(errno));
471 confbase = xstrdup("");
474 if (setuid(uid) != 0) {
475 logger(LOG_ERR, "System call `%s' failed: %s",
476 "setuid", strerror(errno));
484 # define setpriority(level) SetPriorityClass(GetCurrentProcess(), level)
486 # define NORMAL_PRIORITY_CLASS 0
487 # define BELOW_NORMAL_PRIORITY_CLASS 10
488 # define HIGH_PRIORITY_CLASS -10
489 # define setpriority(level) nice(level)
492 int main(int argc, char **argv) {
493 program_name = argv[0];
495 if(!parse_options(argc, argv))
501 printf("%s version %s (built %s %s, protocol %d)\n", PACKAGE,
502 VERSION, __DATE__, __TIME__, PROT_CURRENT);
503 printf("Copyright (C) 1998-2009 Ivo Timmermans, Guus Sliepen and others.\n"
504 "See the AUTHORS file for a complete list.\n\n"
505 "tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
506 "and you are welcome to redistribute it under certain conditions;\n"
507 "see the file COPYING for details.\n");
518 return !kill_other(kill_tincd);
520 openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
524 init_configuration(&config_tree);
526 /* Slllluuuuuuurrrrp! */
528 RAND_load_file("/dev/urandom", 1024);
530 ENGINE_load_builtin_engines();
531 ENGINE_register_all_complete();
533 OpenSSL_add_all_algorithms();
536 read_server_config();
537 return !keygen(generate_keys);
540 if(!read_server_config())
543 if(lzo_init() != LZO_E_OK) {
544 logger(LOG_ERR, "Error initializing LZO compressor!");
549 if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
550 logger(LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
554 if(!do_detach || !init_service())
555 return main2(argc, argv);
560 int main2(int argc, char **argv) {
561 InitializeCriticalSection(&mutex);
562 EnterCriticalSection(&mutex);
569 /* Lock all pages into memory if requested.
570 * This has to be done after daemon()/fork() so it works for child.
571 * No need to do that in parent as it's very short-lived. */
572 if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
573 logger(LOG_ERR, "System call `%s' failed: %s", "mlockall",
579 /* Setup sockets and open device. */
584 /* Initiate all outgoing connections. */
586 try_outgoing_connections();
588 /* Change process priority */
592 if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
593 if(!strcasecmp(priority, "Normal"))
594 setpriority(NORMAL_PRIORITY_CLASS);
595 else if(!strcasecmp(priority, "Low"))
596 setpriority(BELOW_NORMAL_PRIORITY_CLASS);
597 else if(!strcasecmp(priority, "High"))
598 setpriority(HIGH_PRIORITY_CLASS);
600 logger(LOG_ERR, "Invalid priority `%s`!", priority);
605 /* drop privileges */
609 /* Start main loop. It only exits when tinc is killed. */
611 status = main_loop();
613 /* Shutdown properly. */
618 close_network_connections();
621 logger(LOG_NOTICE, "Terminating");
624 remove_pid(pidfilename);
629 CRYPTO_cleanup_all_ex_data();
633 exit_configuration(&config_tree);