swanctl: Pass optional connection name to --initiate/install/uninstall
[strongswan.git] / src / charon / charon.c
1 /*
2 * Copyright (C) 2006-2012 Tobias Brunner
3 * Copyright (C) 2005-2009 Martin Willi
4 * Copyright (C) 2006 Daniel Roethlisberger
5 * Copyright (C) 2005 Jan Hutter
6 * Hochschule fuer Technik Rapperswil
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 * for more details.
17 */
18
19 #include <stdio.h>
20 #include <signal.h>
21 #include <pthread.h>
22 #include <sys/stat.h>
23 #include <sys/types.h>
24 #include <sys/utsname.h>
25 #include <unistd.h>
26 #include <getopt.h>
27 #include <fcntl.h>
28 #include <errno.h>
29
30 #include <daemon.h>
31
32 #include <library.h>
33 #include <utils/backtrace.h>
34 #include <threading/thread.h>
35
36 #ifdef ANDROID
37 #include <private/android_filesystem_config.h> /* for AID_VPN */
38 #endif
39
40 /**
41 * PID file, in which charon stores its process id
42 */
43 #define PID_FILE IPSEC_PIDDIR "/charon.pid"
44
45 /**
46 * Default user and group
47 */
48 #ifndef IPSEC_USER
49 #define IPSEC_USER NULL
50 #endif
51
52 #ifndef IPSEC_GROUP
53 #define IPSEC_GROUP NULL
54 #endif
55
56 /**
57 * Global reference to PID file (required to truncate, if undeletable)
58 */
59 static FILE *pidfile = NULL;
60
61 /**
62 * hook in library for debugging messages
63 */
64 extern void (*dbg) (debug_t group, level_t level, char *fmt, ...);
65
66 /**
67 * Logging hook for library logs, using stderr output
68 */
69 static void dbg_stderr(debug_t group, level_t level, char *fmt, ...)
70 {
71 va_list args;
72
73 if (level <= 1)
74 {
75 va_start(args, fmt);
76 fprintf(stderr, "00[%N] ", debug_names, group);
77 vfprintf(stderr, fmt, args);
78 fprintf(stderr, "\n");
79 va_end(args);
80 }
81 }
82
83 /**
84 * Run the daemon and handle unix signals
85 */
86 static void run()
87 {
88 sigset_t set;
89
90 /* handle SIGINT, SIGHUP and SIGTERM in this handler */
91 sigemptyset(&set);
92 sigaddset(&set, SIGINT);
93 sigaddset(&set, SIGHUP);
94 sigaddset(&set, SIGTERM);
95 sigprocmask(SIG_BLOCK, &set, NULL);
96
97 while (TRUE)
98 {
99 int sig;
100
101 sig = sigwaitinfo(&set, NULL);
102 if (sig == -1)
103 {
104 if (errno == EINTR)
105 { /* ignore signals we didn't wait for */
106 continue;
107 }
108 DBG1(DBG_DMN, "waiting for signal failed: %s", strerror(errno));
109 return;
110 }
111 switch (sig)
112 {
113 case SIGHUP:
114 {
115 DBG1(DBG_DMN, "signal of type SIGHUP received. Reloading "
116 "configuration");
117 if (lib->settings->load_files(lib->settings, lib->conf, FALSE))
118 {
119 charon->load_loggers(charon);
120 lib->plugins->reload(lib->plugins, NULL);
121 }
122 else
123 {
124 DBG1(DBG_DMN, "reloading config failed, keeping old");
125 }
126 break;
127 }
128 case SIGINT:
129 {
130 DBG1(DBG_DMN, "signal of type SIGINT received. Shutting down");
131 charon->bus->alert(charon->bus, ALERT_SHUTDOWN_SIGNAL, sig);
132 return;
133 }
134 case SIGTERM:
135 {
136 DBG1(DBG_DMN, "signal of type SIGTERM received. Shutting down");
137 charon->bus->alert(charon->bus, ALERT_SHUTDOWN_SIGNAL, sig);
138 return;
139 }
140 }
141 }
142 }
143
144 /**
145 * lookup UID and GID
146 */
147 static bool lookup_uid_gid()
148 {
149 char *name;
150
151 name = lib->settings->get_str(lib->settings, "charon.user", IPSEC_USER);
152 if (name && !lib->caps->resolve_uid(lib->caps, name))
153 {
154 return FALSE;
155 }
156 name = lib->settings->get_str(lib->settings, "charon.group", IPSEC_GROUP);
157 if (name && !lib->caps->resolve_gid(lib->caps, name))
158 {
159 return FALSE;
160 }
161 #ifdef ANDROID
162 lib->caps->set_uid(lib->caps, AID_VPN);
163 #endif
164 return TRUE;
165 }
166
167 /**
168 * Handle SIGSEGV/SIGILL signals raised by threads
169 */
170 static void segv_handler(int signal)
171 {
172 backtrace_t *backtrace;
173
174 DBG1(DBG_DMN, "thread %u received %d", thread_current_id(), signal);
175 backtrace = backtrace_create(2);
176 backtrace->log(backtrace, NULL, TRUE);
177 backtrace->log(backtrace, stderr, TRUE);
178 backtrace->destroy(backtrace);
179
180 DBG1(DBG_DMN, "killing ourself, received critical signal");
181 abort();
182 }
183
184 /**
185 * Check/create PID file, return TRUE if already running
186 */
187 static bool check_pidfile()
188 {
189 struct stat stb;
190
191 if (stat(PID_FILE, &stb) == 0)
192 {
193 pidfile = fopen(PID_FILE, "r");
194 if (pidfile)
195 {
196 char buf[64];
197 pid_t pid = 0;
198
199 memset(buf, 0, sizeof(buf));
200 if (fread(buf, 1, sizeof(buf), pidfile))
201 {
202 buf[sizeof(buf) - 1] = '\0';
203 pid = atoi(buf);
204 }
205 fclose(pidfile);
206 if (pid && kill(pid, 0) == 0)
207 { /* such a process is running */
208 return TRUE;
209 }
210 }
211 DBG1(DBG_DMN, "removing pidfile '"PID_FILE"', process not running");
212 unlink(PID_FILE);
213 }
214
215 /* create new pidfile */
216 pidfile = fopen(PID_FILE, "w");
217 if (pidfile)
218 {
219 int fd;
220
221 fd = fileno(pidfile);
222 if (fd == -1 || fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
223 {
224 DBG1(DBG_LIB, "setting FD_CLOEXEC for '"PID_FILE"' failed: %s",
225 strerror(errno));
226 }
227 ignore_result(fchown(fileno(pidfile),
228 lib->caps->get_uid(lib->caps),
229 lib->caps->get_gid(lib->caps)));
230 fprintf(pidfile, "%d\n", getpid());
231 fflush(pidfile);
232 }
233 return FALSE;
234 }
235
236 /**
237 * Delete/truncate the PID file
238 */
239 static void unlink_pidfile()
240 {
241 /* because unlinking the PID file may fail, we truncate it to ensure the
242 * daemon can be properly restarted. one probable cause for this is the
243 * combination of not running as root and the effective user lacking
244 * permissions on the parent dir(s) of the PID file */
245 if (pidfile)
246 {
247 ignore_result(ftruncate(fileno(pidfile), 0));
248 fclose(pidfile);
249 }
250 unlink(PID_FILE);
251 }
252
253 /**
254 * print command line usage and exit
255 */
256 static void usage(const char *msg)
257 {
258 if (msg != NULL && *msg != '\0')
259 {
260 fprintf(stderr, "%s\n", msg);
261 }
262 fprintf(stderr, "Usage: charon\n"
263 " [--help]\n"
264 " [--version]\n"
265 " [--use-syslog]\n"
266 " [--debug-<type> <level>]\n"
267 " <type>: log context type (dmn|mgr|ike|chd|job|cfg|knl|net|asn|enc|tnc|imc|imv|pts|tls|esp|lib)\n"
268 " <level>: log verbosity (-1 = silent, 0 = audit, 1 = control,\n"
269 " 2 = controlmore, 3 = raw, 4 = private)\n"
270 "\n"
271 );
272 }
273
274 /**
275 * Main function, starts the daemon.
276 */
277 int main(int argc, char *argv[])
278 {
279 struct sigaction action;
280 int group, status = SS_RC_INITIALIZATION_FAILED;
281 struct utsname utsname;
282 level_t levels[DBG_MAX];
283 bool use_syslog = FALSE;
284
285 /* logging for library during initialization, as we have no bus yet */
286 dbg = dbg_stderr;
287
288 /* initialize library */
289 if (!library_init(NULL, "charon"))
290 {
291 library_deinit();
292 exit(SS_RC_LIBSTRONGSWAN_INTEGRITY);
293 }
294
295 if (lib->integrity &&
296 !lib->integrity->check_file(lib->integrity, "charon", argv[0]))
297 {
298 dbg_stderr(DBG_DMN, 1, "integrity check of charon failed");
299 library_deinit();
300 exit(SS_RC_DAEMON_INTEGRITY);
301 }
302
303 if (!libcharon_init())
304 {
305 dbg_stderr(DBG_DMN, 1, "initialization failed - aborting charon");
306 goto deinit;
307 }
308
309 /* use CTRL loglevel for default */
310 for (group = 0; group < DBG_MAX; group++)
311 {
312 levels[group] = LEVEL_CTRL;
313 }
314
315 /* handle arguments */
316 for (;;)
317 {
318 struct option long_opts[] = {
319 { "help", no_argument, NULL, 'h' },
320 { "version", no_argument, NULL, 'v' },
321 { "use-syslog", no_argument, NULL, 'l' },
322 /* TODO: handle "debug-all" */
323 { "debug-dmn", required_argument, &group, DBG_DMN },
324 { "debug-mgr", required_argument, &group, DBG_MGR },
325 { "debug-ike", required_argument, &group, DBG_IKE },
326 { "debug-chd", required_argument, &group, DBG_CHD },
327 { "debug-job", required_argument, &group, DBG_JOB },
328 { "debug-cfg", required_argument, &group, DBG_CFG },
329 { "debug-knl", required_argument, &group, DBG_KNL },
330 { "debug-net", required_argument, &group, DBG_NET },
331 { "debug-asn", required_argument, &group, DBG_ASN },
332 { "debug-enc", required_argument, &group, DBG_ENC },
333 { "debug-tnc", required_argument, &group, DBG_TNC },
334 { "debug-imc", required_argument, &group, DBG_IMC },
335 { "debug-imv", required_argument, &group, DBG_IMV },
336 { "debug-pts", required_argument, &group, DBG_PTS },
337 { "debug-tls", required_argument, &group, DBG_TLS },
338 { "debug-esp", required_argument, &group, DBG_ESP },
339 { "debug-lib", required_argument, &group, DBG_LIB },
340 { 0,0,0,0 }
341 };
342
343 int c = getopt_long(argc, argv, "", long_opts, NULL);
344 switch (c)
345 {
346 case EOF:
347 break;
348 case 'h':
349 usage(NULL);
350 status = 0;
351 goto deinit;
352 case 'v':
353 printf("Linux strongSwan %s\n", VERSION);
354 status = 0;
355 goto deinit;
356 case 'l':
357 use_syslog = TRUE;
358 continue;
359 case 0:
360 /* option is in group */
361 levels[group] = atoi(optarg);
362 continue;
363 default:
364 usage("");
365 status = 1;
366 goto deinit;
367 }
368 break;
369 }
370
371 if (!lookup_uid_gid())
372 {
373 dbg_stderr(DBG_DMN, 1, "invalid uid/gid - aborting charon");
374 goto deinit;
375 }
376
377 charon->set_default_loggers(charon, levels, !use_syslog);
378 charon->load_loggers(charon);
379
380 if (uname(&utsname) != 0)
381 {
382 memset(&utsname, 0, sizeof(utsname));
383 }
384 DBG1(DBG_DMN, "Starting IKE charon daemon (strongSwan "VERSION", %s %s, %s)",
385 utsname.sysname, utsname.release, utsname.machine);
386 if (lib->integrity)
387 {
388 DBG1(DBG_DMN, "integrity tests enabled:");
389 DBG1(DBG_DMN, "lib 'libstrongswan': passed file and segment integrity tests");
390 DBG1(DBG_DMN, "lib 'libcharon': passed file and segment integrity tests");
391 DBG1(DBG_DMN, "daemon 'charon': passed file integrity test");
392 }
393
394 /* initialize daemon */
395 if (!charon->initialize(charon,
396 lib->settings->get_str(lib->settings, "charon.load", PLUGINS)))
397 {
398 DBG1(DBG_DMN, "initialization failed - aborting charon");
399 goto deinit;
400 }
401 lib->plugins->status(lib->plugins, LEVEL_CTRL);
402
403 if (check_pidfile())
404 {
405 DBG1(DBG_DMN, "charon already running (\""PID_FILE"\" exists)");
406 goto deinit;
407 }
408
409 if (!lib->caps->drop(lib->caps))
410 {
411 DBG1(DBG_DMN, "capability dropping failed - aborting charon");
412 goto deinit;
413 }
414
415 /* add handler for SEGV and ILL,
416 * INT, TERM and HUP are handled by sigwaitinfo() in run() */
417 action.sa_handler = segv_handler;
418 action.sa_flags = 0;
419 sigemptyset(&action.sa_mask);
420 sigaddset(&action.sa_mask, SIGINT);
421 sigaddset(&action.sa_mask, SIGTERM);
422 sigaddset(&action.sa_mask, SIGHUP);
423 sigaction(SIGSEGV, &action, NULL);
424 sigaction(SIGILL, &action, NULL);
425 sigaction(SIGBUS, &action, NULL);
426 action.sa_handler = SIG_IGN;
427 sigaction(SIGPIPE, &action, NULL);
428
429 pthread_sigmask(SIG_SETMASK, &action.sa_mask, NULL);
430
431 /* start daemon (i.e. the threads in the thread-pool) */
432 charon->start(charon);
433
434 /* main thread goes to run loop */
435 run();
436
437 /* normal termination, cleanup and exit */
438 unlink_pidfile();
439 status = 0;
440
441 deinit:
442 libcharon_deinit();
443 library_deinit();
444 return status;
445 }