2 tincd.c -- the main file for tincd
3 Copyright (C) 1998-2005 Ivo Timmermans
4 2000-2015 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 */
100 static int status = 1;
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},
117 {"option", required_argument, NULL, 'o'},
122 static struct WSAData wsa_state;
123 CRITICAL_SECTION mutex;
124 int main2(int argc, char **argv);
127 static void usage(bool status) {
129 fprintf(stderr, "Try `%s --help\' for more information.\n",
132 printf("Usage: %s [option]...\n\n", program_name);
133 printf(" -c, --config=DIR Read configuration options from DIR.\n"
134 " -D, --no-detach Don't fork and detach.\n"
135 " -d, --debug[=LEVEL] Increase debug level or set it to LEVEL.\n"
136 " -k, --kill[=SIGNAL] Attempt to kill a running tincd and exit.\n"
137 " -n, --net=NETNAME Connect to net NETNAME.\n"
138 " -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
139 " -L, --mlock Lock tinc into main memory.\n"
140 " --logfile[=FILENAME] Write log entries to a logfile.\n"
141 " --pidfile=FILENAME Write PID to FILENAME.\n"
142 " -o, --option=[HOST.]KEY=VALUE Set global/host configuration value.\n"
143 " -R, --chroot chroot to NET dir at startup.\n"
144 " -U, --user=USER setuid to given USER at startup.\n"
145 " --help Display this help and exit.\n"
146 " --version Output version information and exit.\n\n");
147 printf("Report bugs to tinc@tinc-vpn.org.\n");
151 static bool parse_options(int argc, char **argv) {
154 int option_index = 0;
157 cmdline_conf = list_alloc((list_action_t)free_config);
159 while((r = getopt_long(argc, argv, "c:DLd::k::n:o:K::RU:", long_options, &option_index)) != EOF) {
161 case 0: /* long option */
164 case 'c': /* config file */
166 fprintf(stderr, "Only one configuration directory can be given.\n");
170 confbase = xstrdup(optarg);
173 case 'D': /* no detach */
177 case 'L': /* no detach */
178 #ifndef HAVE_MLOCKALL
179 logger(LOG_ERR, "%s not supported on this platform", "mlockall()");
186 case 'd': /* increase debug level */
187 if(!optarg && optind < argc && *argv[optind] != '-')
188 optarg = argv[optind++];
190 debug_level = atoi(optarg);
195 case 'k': /* kill old tincds */
197 if(!optarg && optind < argc && *argv[optind] != '-')
198 optarg = argv[optind++];
200 if(!strcasecmp(optarg, "HUP"))
202 else if(!strcasecmp(optarg, "TERM"))
203 kill_tincd = SIGTERM;
204 else if(!strcasecmp(optarg, "KILL"))
205 kill_tincd = SIGKILL;
206 else if(!strcasecmp(optarg, "USR1"))
207 kill_tincd = SIGUSR1;
208 else if(!strcasecmp(optarg, "USR2"))
209 kill_tincd = SIGUSR2;
210 else if(!strcasecmp(optarg, "WINCH"))
211 kill_tincd = SIGWINCH;
212 else if(!strcasecmp(optarg, "INT"))
214 else if(!strcasecmp(optarg, "ALRM"))
215 kill_tincd = SIGALRM;
216 else if(!strcasecmp(optarg, "ABRT"))
217 kill_tincd = SIGABRT;
219 kill_tincd = atoi(optarg);
222 fprintf(stderr, "Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n",
229 kill_tincd = SIGTERM;
235 case 'n': /* net name given */
236 /* netname "." is special: a "top-level name" */
238 fprintf(stderr, "Only one netname can be given.\n");
242 if(optarg && strcmp(optarg, "."))
243 netname = xstrdup(optarg);
246 case 'o': /* option */
247 cfg = parse_config_line(optarg, NULL, ++lineno);
250 list_insert_tail(cmdline_conf, cfg);
253 case 'K': /* generate public/private keypair */
254 if(!optarg && optind < argc && *argv[optind] != '-')
255 optarg = argv[optind++];
257 generate_keys = atoi(optarg);
259 if(generate_keys < 512) {
260 fprintf(stderr, "Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n",
266 generate_keys &= ~7; /* Round it to bytes */
268 generate_keys = 2048;
271 case 'R': /* chroot to NETNAME dir */
275 case 'U': /* setuid to USER */
279 case 1: /* show help */
283 case 2: /* show version */
287 case 3: /* bypass security */
288 bypass_security = true;
291 case 4: /* write log entries to a file */
293 if(!optarg && optind < argc && *argv[optind] != '-')
294 optarg = argv[optind++];
297 fprintf(stderr, "Only one logfile can be given.\n");
301 logfilename = xstrdup(optarg);
305 case 5: /* write PID to a file */
307 fprintf(stderr, "Only one pidfile can be given.\n");
311 pidfilename = xstrdup(optarg);
324 fprintf(stderr, "%s: unrecognized argument '%s'\n", argv[0], argv[optind]);
332 /* This function prettyprints the key generation process */
334 static void indicator(int a, int b, void *p) {
337 fprintf(stderr, ".");
341 fprintf(stderr, "+");
345 fprintf(stderr, "-");
351 fprintf(stderr, " p\n");
355 fprintf(stderr, " q\n");
359 fprintf(stderr, "?");
364 fprintf(stderr, "?");
369 Generate a public/private RSA keypair, and ask for a file to store
372 static bool keygen(int bits) {
375 char *pubname, *privname;
377 fprintf(stderr, "Generating %d bits keys:\n", bits);
378 rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
381 fprintf(stderr, "Error during key generation!\n");
384 fprintf(stderr, "Done.\n");
386 xasprintf(&privname, "%s/rsa_key.priv", confbase);
387 f = ask_and_open(privname, "private RSA key");
394 /* Make it unreadable for others. */
395 fchmod(fileno(f), 0600);
399 PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
402 char *name = get_name();
405 xasprintf(&pubname, "%s/hosts/%s", confbase, name);
408 xasprintf(&pubname, "%s/rsa_key.pub", confbase);
411 f = ask_and_open(pubname, "public RSA key");
418 PEM_write_RSAPublicKey(f, rsa_key);
425 Set all files and paths according to netname
427 static void make_names(void) {
430 char installdir[1024] = "";
431 DWORD len = sizeof(installdir);
435 xasprintf(&identname, "tinc.%s", netname);
437 identname = xstrdup("tinc");
440 if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
441 if(!RegQueryValueEx(key, NULL, 0, 0, (LPBYTE)installdir, &len)) {
444 xasprintf(&confbase, "%s/%s", installdir, netname);
446 xasprintf(&confbase, "%s", installdir);
449 xasprintf(&logfilename, "%s/tinc.log", confbase);
458 xasprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
461 xasprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
465 xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
467 logger(LOG_INFO, "Both netname and configuration directory given, using the latter...");
470 xasprintf(&confbase, CONFDIR "/tinc");
474 static void free_names() {
475 if (identname) free(identname);
476 if (netname) free(netname);
477 if (pidfilename) free(pidfilename);
478 if (logfilename) free(logfilename);
479 if (confbase) free(confbase);
482 static bool drop_privs() {
485 logger(LOG_ERR, "%s not supported on this platform", "-U");
489 logger(LOG_ERR, "%s not supported on this platform", "-R");
495 struct passwd *pw = getpwnam(switchuser);
497 logger(LOG_ERR, "unknown user `%s'", switchuser);
501 if (initgroups(switchuser, pw->pw_gid) != 0 ||
502 setgid(pw->pw_gid) != 0) {
503 logger(LOG_ERR, "System call `%s' failed: %s",
504 "initgroups", strerror(errno));
508 // Not supported in android NDK
514 tzset(); /* for proper timestamps in logs */
515 if (chroot(confbase) != 0 || chdir("/") != 0) {
516 logger(LOG_ERR, "System call `%s' failed: %s",
517 "chroot", strerror(errno));
521 confbase = xstrdup("");
524 if (setuid(uid) != 0) {
525 logger(LOG_ERR, "System call `%s' failed: %s",
526 "setuid", strerror(errno));
534 # define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
536 # define NORMAL_PRIORITY_CLASS 0
537 # define BELOW_NORMAL_PRIORITY_CLASS 10
538 # define HIGH_PRIORITY_CLASS -10
539 # define setpriority(level) (setpriority(PRIO_PROCESS, 0, (level)))
542 int main(int argc, char **argv) {
543 program_name = argv[0];
545 if(!parse_options(argc, argv))
551 printf("%s version %s (built %s %s, protocol %d)\n", PACKAGE,
552 VERSION, __DATE__, __TIME__, PROT_CURRENT);
553 printf("Copyright (C) 1998-2015 Ivo Timmermans, Guus Sliepen and others.\n"
554 "See the AUTHORS file for a complete list.\n\n"
555 "tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
556 "and you are welcome to redistribute it under certain conditions;\n"
557 "see the file COPYING for details.\n");
568 return !kill_other(kill_tincd);
570 openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
574 if(getenv("LISTEN_PID") && atoi(getenv("LISTEN_PID")) == getpid())
577 unsetenv("LISTEN_PID");
580 init_configuration(&config_tree);
582 /* Slllluuuuuuurrrrp! */
584 RAND_load_file("/dev/urandom", 1024);
586 ENGINE_load_builtin_engines();
587 ENGINE_register_all_complete();
589 OpenSSL_add_all_algorithms();
592 read_server_config();
593 return !keygen(generate_keys);
596 if(!read_server_config())
600 if(lzo_init() != LZO_E_OK) {
601 logger(LOG_ERR, "Error initializing LZO compressor!");
607 if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
608 logger(LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
612 if(!do_detach || !init_service())
613 return main2(argc, argv);
618 int main2(int argc, char **argv) {
619 InitializeCriticalSection(&mutex);
620 EnterCriticalSection(&mutex);
622 char *priority = NULL;
628 /* Lock all pages into memory if requested.
629 * This has to be done after daemon()/fork() so it works for child.
630 * No need to do that in parent as it's very short-lived. */
631 if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
632 logger(LOG_ERR, "System call `%s' failed: %s", "mlockall",
638 /* Setup sockets and open device. */
643 /* Initiate all outgoing connections. */
645 try_outgoing_connections();
647 /* Change process priority */
649 if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
650 if(!strcasecmp(priority, "Normal")) {
651 if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
652 logger(LOG_ERR, "System call `%s' failed: %s",
653 "setpriority", strerror(errno));
656 } else if(!strcasecmp(priority, "Low")) {
657 if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
658 logger(LOG_ERR, "System call `%s' failed: %s",
659 "setpriority", strerror(errno));
662 } else if(!strcasecmp(priority, "High")) {
663 if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
664 logger(LOG_ERR, "System call `%s' failed: %s",
665 "setpriority", strerror(errno));
669 logger(LOG_ERR, "Invalid priority `%s`!", priority);
674 /* drop privileges */
678 /* Start main loop. It only exits when tinc is killed. */
680 status = main_loop();
682 /* Shutdown properly. */
687 close_network_connections();
690 logger(LOG_NOTICE, "Terminating");
693 remove_pid(pidfilename);
700 CRYPTO_cleanup_all_ex_data();
704 exit_configuration(&config_tree);
705 list_free(cmdline_conf);