2 * @brief The main function.
6 * @copyright Intra2net AG
14 #define PIDFILE "/var/run/bpdyndnsd/bpdyndnsd.pid"
20 #include <boost/foreach.hpp>
21 #include <sys/types.h>
24 #include "updater.hpp"
29 volatile bool need_config_reload = false;
30 volatile bool exit_now = false;
32 volatile bool caught_sig_usr1 = false;
33 volatile bool caught_sig_usr2 = false;
34 volatile bool caught_sig_rtmin1 = false;
37 * Checks if a bpdyndnsd process is already running.
38 * @param updater Shared Pointer to updater, needed for logging.
39 * @return 0 if process not running already or pid of already running process.
41 int check_for_running_process()
43 ifstream pidfile(PIDFILE);
44 if ( pidfile.is_open() )
49 updater->get_logger()->print_pid_found(pid);
53 // check if process still running ret_val==-1 -> not runnig, ret_val==0 -> running
54 if ( kill(pid,0) == 0)
56 updater->get_logger()->print_process_already_running(pid);
67 * Writes the pid into the pidfile.
68 * @param pid The process's pid.
70 int write_pidfile(int pid)
72 ofstream pidfile(PIDFILE);
73 if ( pidfile.is_open() )
75 pidfile << pid << endl;
79 updater->get_logger()->print_error_opening_rw(PIDFILE);
88 * Parent shutdown function
89 * @return 0 if all is fine, -1 otherwise
91 int shutdown_parent(bool remove_pid, int ret_val)
93 // starting shutdown_parent
94 updater->get_logger()->print_starting_shutdown_parent();
96 // remove pidfile if requested
100 // shutdown parent complete
101 updater->get_logger()->print_shutdown_parent_succeeded();
103 // release shared pointer
112 * @return 0 if all is fine, -1 otherwise
119 updater->get_logger()->print_starting_shutdown();
121 // serialize actual service objects
122 if ( updater->get_service_holder()->serialize_services() != 0 )
129 updater->get_logger()->print_shutdown_succeeded();
131 // release shared pointer
139 * Signal SIGTERM caught, releasing resources and exit.
140 * @param param Parameter from the signal interface.
142 void terminate(int param)
144 updater->get_logger()->print_caught_sigterm();
150 * Signal SIGUSR1 caught, switching to offline mode.
151 * @param param Parameter from the signal interface.
153 void switch_to_offline(int param)
155 caught_sig_usr1 = true;
160 * Signal SIGHUP caught, reloading config.
161 * @param param Parameter from the signal interface.
163 void reload_config(int param)
165 need_config_reload = true;
170 * Signal SIGUSR2 caught, switching to online mode.
171 * @param param Parameter from the signal interface.
173 void switch_to_online(int param)
175 caught_sig_usr2 = true;
180 * Signal SIGRTMIN caught, switching to online mode with webcheck enabled.
181 * @param param Parameter from the signal interface.
183 void switch_to_online_webcheck(int param)
185 caught_sig_rtmin1 = true;
190 * Initialize the signals we handle.
191 * @return 0 if all is fine, -1 on error.
195 sighandler_t ret_val;
196 ret_val = signal(SIGTERM,terminate);
197 if ( ret_val == SIG_ERR )
199 updater->get_logger()->print_error_setting_signal("SIGTERM");
202 ret_val = signal(SIGUSR1,switch_to_offline);
203 if ( ret_val == SIG_ERR )
205 updater->get_logger()->print_error_setting_signal("SIGUSR1");
208 ret_val = signal(SIGHUP,reload_config);
209 if ( ret_val == SIG_ERR )
211 updater->get_logger()->print_error_setting_signal("SIGHUP");
214 ret_val = signal(SIGUSR2,switch_to_online);
215 if ( ret_val == SIG_ERR )
217 updater->get_logger()->print_error_setting_signal("SIGUSR2");
220 ret_val = signal(SIGRTMIN,switch_to_online_webcheck);
221 if ( ret_val == SIG_ERR )
223 updater->get_logger()->print_error_setting_signal("SIGRTMIN");
232 * Try to run in daemon mode if enabled in config.
233 * @param daemon_mode True if process should detach to init (run as daemon), false if not detach to init.
234 * @return 0 if all is fine, -1 on error.
236 int init_daemon_mode(bool daemon_mode)
238 updater->get_logger()->print_daemon_mode(daemon_mode);
239 if ( daemon_mode == true )
245 updater->get_logger()->print_error_fork();
250 // parent continues here
251 if ( write_pidfile(pid) != 0 )
253 if ( kill(pid,SIGTERM) != 0 )
255 updater->get_logger()->print_error_kill_child(pid);
256 shutdown_parent(false,-1); /*lint !e534 */
260 updater->get_logger()->print_child_killed(pid);
261 shutdown_parent(true,-1); /*lint !e534 */
264 updater->get_logger()->print_runnig_as_daemon(pid);
265 shutdown_parent(false,0); /*lint !e534 */
271 if ( write_pidfile(getpid()) != 0 )
273 shutdown(); /*lint !e534 */
281 * @brief The main part.
282 * @param argc Number of arguments
283 * @param argv Command line arguments
284 * @return 0 if all is fine.
286 int main(int argc, char *argv[])
288 // initialize Updater
289 updater = Updater::Ptr(new Updater);
291 // load config and initialize helper classes
292 if ( updater->load_config(argc,argv) != 0 )
295 // open pidfile and check for running process
296 if ( check_for_running_process() != 0)
299 // init signal handling
300 if ( init_signals() != 0)
303 // init daemon_mode if enabled
304 if ( init_daemon_mode(updater->get_config()->get_daemon_mode()) != 0 )
307 // Should we start in offline mode?
308 bool is_online = !updater->get_config()->get_start_offline();
309 bool webcheck_enabled = updater->get_config()->get_webcheck_enabled();
311 // One shot run if daemon mode is disabled
312 if (updater->get_config()->get_daemon_mode() != 1)
315 // service processing starts here
321 caught_sig_usr1 = false;
322 updater->get_logger()->print_caught_siguser1();
326 } else if (caught_sig_usr2)
328 caught_sig_usr2 = false;
329 updater->get_logger()->print_caught_siguser2();
333 webcheck_enabled = false;
334 } else if (caught_sig_rtmin1)
336 caught_sig_rtmin1 = false;
337 updater->get_logger()->print_caught_sigrtmin();
339 // Go online - with webcheck
341 webcheck_enabled = true;
345 if ( is_online == true )
347 // Check if webcheck_enabled differs due to caught singnal then set it in config correspondingly
348 if ( updater->get_config()->get_webcheck_enabled() != webcheck_enabled ) /*lint !e731 */
349 updater->get_config()->set_webcheck_enabled(webcheck_enabled);
351 // update all configured services
352 updater->update_services();
356 // We are in offline mode, do nothing, expect printing "offline mode".
357 updater->get_logger()->print_offline_mode();
360 if (need_config_reload)
362 updater->get_logger()->print_caught_sighup();
363 need_config_reload = false;
365 if ( updater->reload_config() != 0 )
367 updater->get_logger()->print_conf_reload_failed_exit();
372 // Snore, snore... don't hog the cpu if we are in daemon_mode.
374 sleep(10); /*lint !e534 */
375 } while ( !exit_now );
377 // Serialize services to save their actual state.
378 if ( shutdown() != 0 )