some cleanups
[strongswan.git] / src / charon / daemon.c
1 /**
2 * @file daemon.c
3 *
4 * @brief Implementation of daemon_t and main of IKEv2-Daemon.
5 *
6 */
7
8 /*
9 * Copyright (C) 2006 Tobias Brunner, Daniel Roethlisberger
10 * Copyright (C) 2005-2006 Martin Willi
11 * Copyright (C) 2005 Jan Hutter
12 * Hochschule fuer Technik Rapperswil
13 *
14 * This program is free software; you can redistribute it and/or modify it
15 * under the terms of the GNU General Public License as published by the
16 * Free Software Foundation; either version 2 of the License, or (at your
17 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
18 *
19 * This program is distributed in the hope that it will be useful, but
20 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
21 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
22 * for more details.
23 */
24
25 #include <stdio.h>
26 #include <signal.h>
27 #include <pthread.h>
28 #include <sys/stat.h>
29 #include <sys/types.h>
30 #include <unistd.h>
31 #include <time.h>
32 #include <string.h>
33 #include <getopt.h>
34 #include <errno.h>
35 #ifdef HAVE_BACKTRACE
36 # include <execinfo.h>
37 #endif /* HAVE_BACKTRACE */
38
39 #include "daemon.h"
40
41 #include <library.h>
42 #include <utils/fetcher.h>
43 #include <config/credentials/local_credential_store.h>
44 #include <config/connections/local_connection_store.h>
45 #include <config/policies/local_policy_store.h>
46 #include <sa/authenticators/eap/eap_method.h>
47
48
49 typedef struct private_daemon_t private_daemon_t;
50
51 /**
52 * Private additions to daemon_t, contains threads and internal functions.
53 */
54 struct private_daemon_t {
55 /**
56 * Public members of daemon_t.
57 */
58 daemon_t public;
59
60 /**
61 * Signal set used for signal handling.
62 */
63 sigset_t signal_set;
64
65 /**
66 * The thread_id of main-thread.
67 */
68 pthread_t main_thread_id;
69 };
70
71 /**
72 * One and only instance of the daemon.
73 */
74 daemon_t *charon;
75
76 /**
77 * hook in library for debugging messages
78 */
79 extern void (*dbg) (int level, char *fmt, ...);
80
81 /**
82 * Logging hook for library logs, spreads debug message over bus
83 */
84 static void dbg_bus(int level, char *fmt, ...)
85 {
86 va_list args;
87
88 va_start(args, fmt);
89 charon->bus->vsignal(charon->bus, DBG_LIB, level, fmt, args);
90 va_end(args);
91 }
92
93 /**
94 * Logging hook for library logs, using stderr output
95 */
96 static void dbg_stderr(int level, char *fmt, ...)
97 {
98 va_list args;
99
100 va_start(args, fmt);
101 fprintf(stderr, "00[LIB] ");
102 vfprintf(stderr, fmt, args);
103 fprintf(stderr, "\n");
104 va_end(args);
105 }
106
107 /**
108 * Run the daemon and handle unix signals
109 */
110 static void run(private_daemon_t *this)
111 {
112 /* reselect signals for this thread */
113 sigemptyset(&(this->signal_set));
114 sigaddset(&(this->signal_set), SIGINT);
115 sigaddset(&(this->signal_set), SIGHUP);
116 sigaddset(&(this->signal_set), SIGTERM);
117 pthread_sigmask(SIG_BLOCK, &(this->signal_set), 0);
118
119 while(TRUE)
120 {
121 int signal_number;
122 int error;
123
124 error = sigwait(&(this->signal_set), &signal_number);
125 if(error)
126 {
127 DBG1(DBG_DMN, "error %d while waiting for a signal", error);
128 return;
129 }
130 switch (signal_number)
131 {
132 case SIGHUP:
133 {
134 DBG1(DBG_DMN, "signal of type SIGHUP received. Ignored");
135 break;
136 }
137 case SIGINT:
138 {
139 DBG1(DBG_DMN, "signal of type SIGINT received. Shutting down");
140 return;
141 }
142 case SIGTERM:
143 DBG1(DBG_DMN, "signal of type SIGTERM received. Shutting down");
144 return;
145 default:
146 {
147 DBG1(DBG_DMN, "unknown signal %d received. Ignored", signal_number);
148 break;
149 }
150 }
151 }
152 }
153
154 /**
155 * Clean up all daemon resources
156 */
157 static void destroy(private_daemon_t *this)
158 {
159 /* destruction is a non trivial task, we need to follow
160 * a strict order to prevent threading issues!
161 * Kill active threads first, except the sender, as
162 * the killed IKE_SA want to send delete messages.
163 */
164 /* we don't want to receive anything anymore... */
165 DESTROY_IF(this->public.receiver);
166 /* ignore all incoming user requests */
167 DESTROY_IF(this->public.stroke);
168 /* stop scheduing jobs */
169 DESTROY_IF(this->public.scheduler);
170 /* stop processing jobs */
171 DESTROY_IF(this->public.thread_pool);
172 /* shut down manager with all IKE SAs */
173 DESTROY_IF(this->public.ike_sa_manager);
174 /* all child SAs should be down now, so kill kernel interface */
175 DESTROY_IF(this->public.kernel_interface);
176 /* destroy other infrastructure */
177 DESTROY_IF(this->public.job_queue);
178 DESTROY_IF(this->public.event_queue);
179 DESTROY_IF(this->public.configuration);
180 DESTROY_IF(this->public.credentials);
181 DESTROY_IF(this->public.connections);
182 DESTROY_IF(this->public.policies);
183 sched_yield();
184 /* we hope the sender could send the outstanding deletes, but
185 * we shut down here at any cost */
186 DESTROY_IF(this->public.sender);
187 DESTROY_IF(this->public.send_queue);
188 DESTROY_IF(this->public.socket);
189 /* before destroying bus with its listeners, rehook library logs */
190 dbg = dbg_stderr;
191 DESTROY_IF(this->public.bus);
192 DESTROY_IF(this->public.outlog);
193 DESTROY_IF(this->public.syslog);
194 DESTROY_IF(this->public.authlog);
195 free(this);
196 }
197
198 /**
199 * Enforce daemon shutdown, with a given reason to do so.
200 */
201 static void kill_daemon(private_daemon_t *this, char *reason)
202 {
203 /* we send SIGTERM, so the daemon can cleanly shut down */
204 DBG1(DBG_DMN, "killing daemon: %s", reason);
205 if (this->main_thread_id == pthread_self())
206 {
207 /* initialization failed, terminate daemon */
208 destroy(this);
209 unlink(PID_FILE);
210 exit(-1);
211 }
212 else
213 {
214 DBG1(DBG_DMN, "sending SIGTERM to ourself");
215 raise(SIGTERM);
216 /* thread must die, since he produced a ciritcal failure and can't continue */
217 pthread_exit(NULL);
218 }
219 }
220
221 /**
222 * Initialize the daemon, optional with a strict crl policy
223 */
224 static void initialize(private_daemon_t *this, bool strict, bool syslog,
225 level_t levels[])
226 {
227 credential_store_t* credentials;
228 signal_t signal;
229
230 /* for uncritical pseudo random numbers */
231 srandom(time(NULL) + getpid());
232
233 /* setup bus and it's listeners first to enable log output */
234 this->public.bus = bus_create();
235 this->public.outlog = file_logger_create(stdout);
236 this->public.syslog = sys_logger_create(LOG_DAEMON);
237 this->public.authlog = sys_logger_create(LOG_AUTHPRIV);
238 this->public.bus->add_listener(this->public.bus, &this->public.syslog->listener);
239 this->public.bus->add_listener(this->public.bus, &this->public.outlog->listener);
240 this->public.bus->add_listener(this->public.bus, &this->public.authlog->listener);
241 this->public.authlog->set_level(this->public.authlog, SIG_ANY, LEVEL_AUDIT);
242 /* set up hook to log dbg message in library via charons message bus */
243 dbg = dbg_bus;
244
245 /* apply loglevels */
246 for (signal = 0; signal < DBG_MAX; signal++)
247 {
248 if (syslog)
249 {
250 this->public.syslog->set_level(this->public.syslog,
251 signal, levels[signal]);
252 }
253 else
254 {
255 this->public.outlog->set_level(this->public.outlog,
256 signal, levels[signal]);
257 }
258 }
259
260 DBG1(DBG_DMN, "starting charon (strongSwan Version %s)", VERSION);
261
262 this->public.configuration = configuration_create();
263 this->public.socket = socket_create(IKEV2_UDP_PORT, IKEV2_NATT_PORT);
264 this->public.ike_sa_manager = ike_sa_manager_create();
265 this->public.job_queue = job_queue_create();
266 this->public.event_queue = event_queue_create();
267 this->public.send_queue = send_queue_create();
268 this->public.connections = (connection_store_t*)local_connection_store_create();
269 this->public.policies = (policy_store_t*)local_policy_store_create();
270 this->public.credentials = (credential_store_t*)local_credential_store_create(strict);
271
272 /* initialize fetcher_t class */
273 fetcher_initialize();
274
275 /* load secrets, ca certificates and crls */
276 credentials = this->public.credentials;
277 credentials->load_ca_certificates(credentials);
278 credentials->load_ocsp_certificates(credentials);
279 credentials->load_crls(credentials);
280 credentials->load_secrets(credentials);
281
282 /* start building threads, we are multi-threaded NOW */
283 this->public.stroke = stroke_create();
284 this->public.sender = sender_create();
285 this->public.receiver = receiver_create();
286 this->public.scheduler = scheduler_create();
287 this->public.kernel_interface = kernel_interface_create();
288 this->public.thread_pool = thread_pool_create(NUMBER_OF_WORKING_THREADS);
289 }
290
291 /**
292 * Handle SIGSEGV/SIGILL signals raised by threads
293 */
294 void signal_handler(int signal)
295 {
296 #ifdef HAVE_BACKTRACE
297 void *array[20];
298 size_t size;
299 char **strings;
300 size_t i;
301
302 size = backtrace(array, 20);
303 strings = backtrace_symbols(array, size);
304
305 DBG1(DBG_DMN, "thread %u received %s. Dumping %d frames from stack:",
306 pthread_self(), signal == SIGSEGV ? "SIGSEGV" : "SIGILL", size);
307
308 for (i = 0; i < size; i++)
309 {
310 DBG1(DBG_DMN, " %s", strings[i]);
311 }
312 free (strings);
313 #else /* !HAVE_BACKTRACE */
314 DBG1(DBG_DMN, "thread %u received %s",
315 pthread_self(), signal == SIGSEGV ? "SIGSEGV" : "SIGILL");
316 #endif /* HAVE_BACKTRACE */
317 DBG1(DBG_DMN, "killing ourself hard after SIGSEGV");
318 raise(SIGKILL);
319 }
320
321 /**
322 * Create the daemon.
323 */
324 private_daemon_t *daemon_create(void)
325 {
326 private_daemon_t *this = malloc_thing(private_daemon_t);
327 struct sigaction action;
328
329 /* assign methods */
330 this->public.kill = (void (*) (daemon_t*,char*))kill_daemon;
331
332 /* NULL members for clean destruction */
333 this->public.socket = NULL;
334 this->public.ike_sa_manager = NULL;
335 this->public.job_queue = NULL;
336 this->public.event_queue = NULL;
337 this->public.send_queue = NULL;
338 this->public.configuration = NULL;
339 this->public.credentials = NULL;
340 this->public.connections = NULL;
341 this->public.policies = NULL;
342 this->public.sender= NULL;
343 this->public.receiver = NULL;
344 this->public.scheduler = NULL;
345 this->public.kernel_interface = NULL;
346 this->public.thread_pool = NULL;
347 this->public.stroke = NULL;
348 this->public.bus = NULL;
349 this->public.outlog = NULL;
350 this->public.syslog = NULL;
351 this->public.authlog = NULL;
352
353 this->main_thread_id = pthread_self();
354
355 /* setup signal handling for all threads */
356 sigemptyset(&(this->signal_set));
357 sigaddset(&(this->signal_set), SIGSEGV);
358 sigaddset(&(this->signal_set), SIGINT);
359 sigaddset(&(this->signal_set), SIGHUP);
360 sigaddset(&(this->signal_set), SIGTERM);
361 pthread_sigmask(SIG_BLOCK, &(this->signal_set), 0);
362
363 /* setup SIGSEGV handler for all threads */
364 action.sa_handler = signal_handler;
365 action.sa_mask = this->signal_set;
366 action.sa_flags = 0;
367 sigaction(SIGSEGV, &action, NULL);
368 sigaction(SIGILL, &action, NULL);
369 return this;
370 }
371
372 /**
373 * print command line usage and exit
374 */
375 static void usage(const char *msg)
376 {
377 if (msg != NULL && *msg != '\0')
378 {
379 fprintf(stderr, "%s\n", msg);
380 }
381 fprintf(stderr, "Usage: charon\n"
382 " [--help]\n"
383 " [--version]\n"
384 " [--strictcrlpolicy]\n"
385 " [--use-syslog]\n"
386 " [--debug-<type> <level>]\n"
387 " <type>: log context type (dmn|mgr|ike|chd|job|cfg|knl|net|enc|lib)\n"
388 " <level>: log verbosity (-1 = silent, 0 = audit, 1 = control,\n"
389 " 2 = controlmore, 3 = raw, 4 = private)\n"
390 "\n"
391 );
392 exit(msg == NULL? 0 : 1);
393 }
394
395 /**
396 * Main function, manages the daemon.
397 */
398 int main(int argc, char *argv[])
399 {
400 bool strict_crl_policy = FALSE;
401 bool use_syslog = FALSE;
402 char *eapdir = IPSEC_EAPDIR;
403
404 private_daemon_t *private_charon;
405 FILE *pid_file;
406 struct stat stb;
407 linked_list_t *list;
408 host_t *host;
409 level_t levels[DBG_MAX];
410 int signal;
411
412 /* use CTRL loglevel for default */
413 for (signal = 0; signal < DBG_MAX; signal++)
414 {
415 levels[signal] = LEVEL_CTRL;
416 }
417
418 /* handle arguments */
419 for (;;)
420 {
421 struct option long_opts[] = {
422 { "help", no_argument, NULL, 'h' },
423 { "version", no_argument, NULL, 'v' },
424 { "use-syslog", no_argument, NULL, 'l' },
425 { "strictcrlpolicy", no_argument, NULL, 'r' },
426 { "eapdir", required_argument, NULL, 'e' },
427 /* TODO: handle "debug-all" */
428 { "debug-dmn", required_argument, &signal, DBG_DMN },
429 { "debug-mgr", required_argument, &signal, DBG_MGR },
430 { "debug-ike", required_argument, &signal, DBG_IKE },
431 { "debug-chd", required_argument, &signal, DBG_CHD },
432 { "debug-job", required_argument, &signal, DBG_JOB },
433 { "debug-cfg", required_argument, &signal, DBG_CFG },
434 { "debug-knl", required_argument, &signal, DBG_KNL },
435 { "debug-net", required_argument, &signal, DBG_NET },
436 { "debug-enc", required_argument, &signal, DBG_ENC },
437 { "debug-lib", required_argument, &signal, DBG_LIB },
438 { 0,0,0,0 }
439 };
440
441 int c = getopt_long(argc, argv, "", long_opts, NULL);
442 switch (c)
443 {
444 case EOF:
445 break;
446 case 'h':
447 usage(NULL);
448 break;
449 case 'v':
450 printf("Linux strongSwan %s\n", VERSION);
451 exit(0);
452 case 'l':
453 use_syslog = TRUE;
454 continue;
455 case 'r':
456 strict_crl_policy = TRUE;
457 continue;
458 case 'e':
459 eapdir = optarg;
460 continue;
461 case 0:
462 /* option is in signal */
463 levels[signal] = atoi(optarg);
464 continue;
465 default:
466 usage("");
467 break;
468 }
469 break;
470 }
471
472 private_charon = daemon_create();
473 charon = (daemon_t*)private_charon;
474
475 /* initialize daemon */
476 initialize(private_charon, strict_crl_policy, use_syslog, levels);
477 /* load pluggable EAP modules */
478 eap_method_load(eapdir);
479
480 /* check/setup PID file */
481 if (stat(PID_FILE, &stb) == 0)
482 {
483 DBG1(DBG_DMN, "charon already running (\""PID_FILE"\" exists)");
484 destroy(private_charon);
485 exit(-1);
486 }
487 pid_file = fopen(PID_FILE, "w");
488 if (pid_file)
489 {
490 fprintf(pid_file, "%d\n", getpid());
491 fclose(pid_file);
492 }
493
494 /* log socket info */
495 list = charon->kernel_interface->create_address_list(charon->kernel_interface);
496 DBG1(DBG_NET, "listening on %d addresses:", list->get_count(list));
497 while (list->remove_first(list, (void**)&host) == SUCCESS)
498 {
499 DBG1(DBG_NET, " %H", host);
500 host->destroy(host);
501 }
502 list->destroy(list);
503
504 /* run daemon */
505 run(private_charon);
506
507 eap_method_unload();
508 /* normal termination, cleanup and exit */
509 destroy(private_charon);
510 unlink(PID_FILE);
511
512 return 0;
513 }