2 tincd.c -- the main file for tincd
3 Copyright (C) 1998-2005 Ivo Timmermans
4 2000-2012 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},
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 */
165 confbase = xstrdup(optarg);
168 case 'D': /* no detach */
172 case 'L': /* no detach */
173 #ifndef HAVE_MLOCKALL
174 logger(LOG_ERR, "%s not supported on this platform", "mlockall()");
181 case 'd': /* inc debug level */
183 debug_level = atoi(optarg);
188 case 'k': /* kill old tincds */
191 if(!strcasecmp(optarg, "HUP"))
193 else if(!strcasecmp(optarg, "TERM"))
194 kill_tincd = SIGTERM;
195 else if(!strcasecmp(optarg, "KILL"))
196 kill_tincd = SIGKILL;
197 else if(!strcasecmp(optarg, "USR1"))
198 kill_tincd = SIGUSR1;
199 else if(!strcasecmp(optarg, "USR2"))
200 kill_tincd = SIGUSR2;
201 else if(!strcasecmp(optarg, "WINCH"))
202 kill_tincd = SIGWINCH;
203 else if(!strcasecmp(optarg, "INT"))
205 else if(!strcasecmp(optarg, "ALRM"))
206 kill_tincd = SIGALRM;
207 else if(!strcasecmp(optarg, "ABRT"))
208 kill_tincd = SIGABRT;
210 kill_tincd = atoi(optarg);
213 fprintf(stderr, "Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n",
220 kill_tincd = SIGTERM;
226 case 'n': /* net name given */
227 /* netname "." is special: a "top-level name" */
228 netname = strcmp(optarg, ".") != 0 ?
229 xstrdup(optarg) : NULL;
232 case 'o': /* option */
233 cfg = parse_config_line(optarg, NULL, ++lineno);
236 list_insert_tail(cmdline_conf, cfg);
239 case 'K': /* generate public/private keypair */
241 generate_keys = atoi(optarg);
243 if(generate_keys < 512) {
244 fprintf(stderr, "Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n",
250 generate_keys &= ~7; /* Round it to bytes */
252 generate_keys = 2048;
255 case 'R': /* chroot to NETNAME dir */
259 case 'U': /* setuid to USER */
263 case 1: /* show help */
267 case 2: /* show version */
271 case 3: /* bypass security */
272 bypass_security = true;
275 case 4: /* write log entries to a file */
278 logfilename = xstrdup(optarg);
281 case 5: /* write PID to a file */
282 pidfilename = xstrdup(optarg);
297 /* This function prettyprints the key generation process */
299 static void indicator(int a, int b, void *p) {
302 fprintf(stderr, ".");
306 fprintf(stderr, "+");
310 fprintf(stderr, "-");
316 fprintf(stderr, " p\n");
320 fprintf(stderr, " q\n");
324 fprintf(stderr, "?");
329 fprintf(stderr, "?");
334 Generate a public/private RSA keypair, and ask for a file to store
337 static bool keygen(int bits) {
340 char *name = get_name();
341 char *pubname, *privname;
343 fprintf(stderr, "Generating %d bits keys:\n", bits);
344 rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
347 fprintf(stderr, "Error during key generation!\n");
350 fprintf(stderr, "Done.\n");
352 xasprintf(&privname, "%s/rsa_key.priv", confbase);
353 f = ask_and_open(privname, "private RSA key");
360 /* Make it unreadable for others. */
361 fchmod(fileno(f), 0600);
365 PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
369 xasprintf(&pubname, "%s/hosts/%s", confbase, name);
371 xasprintf(&pubname, "%s/rsa_key.pub", confbase);
373 f = ask_and_open(pubname, "public RSA key");
380 PEM_write_RSAPublicKey(f, rsa_key);
388 Set all files and paths according to netname
390 static void make_names(void) {
393 char installdir[1024] = "";
394 long len = sizeof(installdir);
398 xasprintf(&identname, "tinc.%s", netname);
400 identname = xstrdup("tinc");
403 if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
404 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
406 xasprintf(&logfilename, "%s/log/%s.log", identname);
409 xasprintf(&confbase, "%s/%s", installdir, netname);
411 xasprintf(&confbase, "%s", installdir);
421 xasprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
424 xasprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
428 xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
430 logger(LOG_INFO, "Both netname and configuration directory given, using the latter...");
433 xasprintf(&confbase, CONFDIR "/tinc");
437 static void free_names() {
438 if (identname) free(identname);
439 if (netname) free(netname);
440 if (pidfilename) free(pidfilename);
441 if (logfilename) free(logfilename);
442 if (confbase) free(confbase);
445 static bool drop_privs() {
448 logger(LOG_ERR, "%s not supported on this platform", "-U");
452 logger(LOG_ERR, "%s not supported on this platform", "-R");
458 struct passwd *pw = getpwnam(switchuser);
460 logger(LOG_ERR, "unknown user `%s'", switchuser);
464 if (initgroups(switchuser, pw->pw_gid) != 0 ||
465 setgid(pw->pw_gid) != 0) {
466 logger(LOG_ERR, "System call `%s' failed: %s",
467 "initgroups", strerror(errno));
471 // Not supported in android NDK
477 tzset(); /* for proper timestamps in logs */
478 if (chroot(confbase) != 0 || chdir("/") != 0) {
479 logger(LOG_ERR, "System call `%s' failed: %s",
480 "chroot", strerror(errno));
484 confbase = xstrdup("");
487 if (setuid(uid) != 0) {
488 logger(LOG_ERR, "System call `%s' failed: %s",
489 "setuid", strerror(errno));
497 # define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
499 # define NORMAL_PRIORITY_CLASS 0
500 # define BELOW_NORMAL_PRIORITY_CLASS 10
501 # define HIGH_PRIORITY_CLASS -10
502 # define setpriority(level) (setpriority(PRIO_PROCESS, 0, (level)))
505 int main(int argc, char **argv) {
506 program_name = argv[0];
508 if(!parse_options(argc, argv))
514 printf("%s version %s (built %s %s, protocol %d)\n", PACKAGE,
515 VERSION, __DATE__, __TIME__, PROT_CURRENT);
516 printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
517 "See the AUTHORS file for a complete list.\n\n"
518 "tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
519 "and you are welcome to redistribute it under certain conditions;\n"
520 "see the file COPYING for details.\n");
531 return !kill_other(kill_tincd);
533 openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
537 if(getenv("LISTEN_PID") && atoi(getenv("LISTEN_PID")) == getpid())
540 unsetenv("LISTEN_PID");
543 init_configuration(&config_tree);
545 /* Slllluuuuuuurrrrp! */
547 RAND_load_file("/dev/urandom", 1024);
549 ENGINE_load_builtin_engines();
550 ENGINE_register_all_complete();
552 OpenSSL_add_all_algorithms();
555 read_server_config();
556 return !keygen(generate_keys);
559 if(!read_server_config())
563 if(lzo_init() != LZO_E_OK) {
564 logger(LOG_ERR, "Error initializing LZO compressor!");
570 if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
571 logger(LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
575 if(!do_detach || !init_service())
576 return main2(argc, argv);
581 int main2(int argc, char **argv) {
582 InitializeCriticalSection(&mutex);
583 EnterCriticalSection(&mutex);
585 char *priority = NULL;
591 /* Lock all pages into memory if requested.
592 * This has to be done after daemon()/fork() so it works for child.
593 * No need to do that in parent as it's very short-lived. */
594 if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
595 logger(LOG_ERR, "System call `%s' failed: %s", "mlockall",
601 /* Setup sockets and open device. */
606 /* Initiate all outgoing connections. */
608 try_outgoing_connections();
610 /* Change process priority */
612 if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
613 if(!strcasecmp(priority, "Normal")) {
614 if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
615 logger(LOG_ERR, "System call `%s' failed: %s",
616 "setpriority", strerror(errno));
619 } else if(!strcasecmp(priority, "Low")) {
620 if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
621 logger(LOG_ERR, "System call `%s' failed: %s",
622 "setpriority", strerror(errno));
625 } else if(!strcasecmp(priority, "High")) {
626 if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
627 logger(LOG_ERR, "System call `%s' failed: %s",
628 "setpriority", strerror(errno));
632 logger(LOG_ERR, "Invalid priority `%s`!", priority);
637 /* drop privileges */
641 /* Start main loop. It only exits when tinc is killed. */
643 status = main_loop();
645 /* Shutdown properly. */
650 close_network_connections();
653 logger(LOG_NOTICE, "Terminating");
656 remove_pid(pidfilename);
663 CRYPTO_cleanup_all_ex_data();
667 exit_configuration(&config_tree);
668 list_free(cmdline_conf);