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b1be615b BS |
1 | /** @file |
2 | * @brief The main function. | |
3 | * | |
4 | * | |
5 | * | |
6 | * @copyright Intra2net AG | |
7 | * @license GPLv2 | |
8 | */ | |
4545a371 BS |
9 | |
10 | #ifdef HAVE_CONFIG_H | |
11 | #include <config.h> | |
12 | #endif | |
13 | ||
c47386eb | 14 | #define PIDFILE "/var/run/bpdyndnsd/bpdyndnsd.pid" |
388f4ab0 | 15 | |
4545a371 | 16 | #include <iostream> |
88a594e8 | 17 | #include <fstream> |
4545a371 BS |
18 | #include <list> |
19 | #include <string> | |
4545a371 | 20 | #include <boost/foreach.hpp> |
88a594e8 BS |
21 | #include <sys/types.h> |
22 | #include <signal.h> | |
23 | ||
4de6a9b8 | 24 | #include "updater.hpp" |
4545a371 | 25 | |
4545a371 BS |
26 | using namespace std; |
27 | ||
88a594e8 | 28 | Updater::Ptr updater; |
4f4a6039 | 29 | volatile bool need_config_reload = false; |
c5a6b1fe | 30 | volatile bool exit_now = false; |
c5675c01 | 31 | |
a6aac246 TJ |
32 | volatile bool caught_sig_usr1 = false; |
33 | volatile bool caught_sig_usr2 = false; | |
34 | volatile bool caught_sig_rtmin1 = false; | |
35 | ||
4545a371 | 36 | /** |
388f4ab0 BS |
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. | |
40 | */ | |
c5675c01 | 41 | int check_for_running_process() |
388f4ab0 BS |
42 | { |
43 | ifstream pidfile(PIDFILE); | |
44 | if ( pidfile.is_open() ) | |
45 | { | |
46 | int pid; | |
47 | pidfile >> pid; | |
48 | if ( pid > 0 ) | |
49 | updater->get_logger()->print_pid_found(pid); | |
50 | else | |
51 | return 0; | |
52 | ||
53 | // check if process still running ret_val==-1 -> not runnig, ret_val==0 -> running | |
54 | if ( kill(pid,0) == 0) | |
55 | { | |
56 | updater->get_logger()->print_process_already_running(pid); | |
57 | pidfile.close(); | |
58 | return pid; | |
59 | } | |
60 | } | |
61 | pidfile.close(); | |
62 | return 0; | |
63 | } | |
64 | ||
c5675c01 BS |
65 | |
66 | /** | |
67 | * Writes the pid into the pidfile. | |
68 | * @param pid The process's pid. | |
69 | */ | |
667c672c | 70 | int write_pidfile(int pid) |
388f4ab0 BS |
71 | { |
72 | ofstream pidfile(PIDFILE); | |
73 | if ( pidfile.is_open() ) | |
74 | { | |
75 | pidfile << pid << endl; | |
76 | } | |
667c672c BS |
77 | else |
78 | { | |
79 | updater->get_logger()->print_error_opening_rw(PIDFILE); | |
80 | return -1; | |
81 | } | |
388f4ab0 | 82 | pidfile.close(); |
667c672c | 83 | return 0; |
388f4ab0 BS |
84 | } |
85 | ||
c5675c01 BS |
86 | |
87 | /** | |
e304c27b BS |
88 | * Parent shutdown function |
89 | * @return 0 if all is fine, -1 otherwise | |
90 | */ | |
91 | int shutdown_parent(bool remove_pid, int ret_val) | |
92 | { | |
93 | // starting shutdown_parent | |
94 | updater->get_logger()->print_starting_shutdown_parent(); | |
95 | ||
96 | // remove pidfile if requested | |
97 | if(remove_pid) | |
98 | unlink(PIDFILE); | |
99 | ||
100 | // shutdown parent complete | |
101 | updater->get_logger()->print_shutdown_parent_succeeded(); | |
102 | ||
103 | // release shared pointer | |
104 | updater.reset(); | |
105 | ||
106 | exit(ret_val); | |
107 | } | |
108 | ||
109 | ||
110 | /** | |
111 | * Shutdown function | |
112 | * @return 0 if all is fine, -1 otherwise | |
113 | */ | |
114 | int shutdown() | |
115 | { | |
116 | int ret_val = 0; | |
117 | ||
118 | // starting shutdown | |
119 | updater->get_logger()->print_starting_shutdown(); | |
120 | ||
121 | // serialize actual service objects | |
122 | if ( updater->get_service_holder()->serialize_services() != 0 ) | |
123 | ret_val = -1; | |
124 | ||
125 | // unlink pidfile | |
126 | unlink(PIDFILE); | |
127 | ||
128 | // shutdown complete | |
129 | updater->get_logger()->print_shutdown_succeeded(); | |
130 | ||
131 | // release shared pointer | |
132 | updater.reset(); | |
133 | ||
134 | return ret_val; | |
135 | } | |
136 | ||
137 | ||
138 | /** | |
c5675c01 BS |
139 | * Signal SIGTERM caught, releasing resources and exit. |
140 | * @param param Parameter from the signal interface. | |
141 | */ | |
142 | void terminate(int param) | |
143 | { | |
144 | updater->get_logger()->print_caught_sigterm(); | |
c5a6b1fe | 145 | exit_now = true; |
08a5a621 | 146 | } /*lint !e715 */ |
c5675c01 BS |
147 | |
148 | ||
149 | /** | |
150 | * Signal SIGUSR1 caught, switching to offline mode. | |
151 | * @param param Parameter from the signal interface. | |
152 | */ | |
153 | void switch_to_offline(int param) | |
154 | { | |
a6aac246 | 155 | caught_sig_usr1 = true; |
08a5a621 | 156 | } /*lint !e715 */ |
c5675c01 BS |
157 | |
158 | ||
159 | /** | |
64ff14c3 | 160 | * Signal SIGHUP caught, reloading config. |
39acb828 | 161 | * @param param Parameter from the signal interface. |
c5675c01 BS |
162 | */ |
163 | void reload_config(int param) | |
164 | { | |
4f4a6039 | 165 | need_config_reload = true; |
64ff14c3 BS |
166 | } /*lint !e715 */ |
167 | ||
168 | ||
169 | /** | |
170 | * Signal SIGUSR2 caught, switching to online mode. | |
171 | * @param param Parameter from the signal interface. | |
172 | */ | |
173 | void switch_to_online(int param) | |
174 | { | |
a6aac246 | 175 | caught_sig_usr2 = true; |
64ff14c3 BS |
176 | } /*lint !e715 */ |
177 | ||
178 | ||
179 | /** | |
180 | * Signal SIGRTMIN caught, switching to online mode with webcheck enabled. | |
181 | * @param param Parameter from the signal interface. | |
182 | */ | |
183 | void switch_to_online_webcheck(int param) | |
184 | { | |
a6aac246 | 185 | caught_sig_rtmin1 = true; |
08a5a621 | 186 | } /*lint !e715 */ |
c5675c01 BS |
187 | |
188 | ||
189 | /** | |
190 | * Initialize the signals we handle. | |
e0080b78 | 191 | * @return 0 if all is fine, -1 on error. |
c5675c01 | 192 | */ |
8bca3c5d | 193 | int init_signals() |
c5675c01 | 194 | { |
8bca3c5d BS |
195 | sighandler_t ret_val; |
196 | ret_val = signal(SIGTERM,terminate); | |
197 | if ( ret_val == SIG_ERR ) | |
667c672c BS |
198 | { |
199 | updater->get_logger()->print_error_setting_signal("SIGTERM"); | |
8bca3c5d | 200 | return -1; |
667c672c | 201 | } |
8bca3c5d BS |
202 | ret_val = signal(SIGUSR1,switch_to_offline); |
203 | if ( ret_val == SIG_ERR ) | |
667c672c BS |
204 | { |
205 | updater->get_logger()->print_error_setting_signal("SIGUSR1"); | |
8bca3c5d | 206 | return -1; |
667c672c | 207 | } |
8bca3c5d BS |
208 | ret_val = signal(SIGHUP,reload_config); |
209 | if ( ret_val == SIG_ERR ) | |
667c672c BS |
210 | { |
211 | updater->get_logger()->print_error_setting_signal("SIGHUP"); | |
8bca3c5d | 212 | return -1; |
667c672c | 213 | } |
64ff14c3 BS |
214 | ret_val = signal(SIGUSR2,switch_to_online); |
215 | if ( ret_val == SIG_ERR ) | |
216 | { | |
217 | updater->get_logger()->print_error_setting_signal("SIGUSR2"); | |
218 | return -1; | |
219 | } | |
220 | ret_val = signal(SIGRTMIN,switch_to_online_webcheck); | |
221 | if ( ret_val == SIG_ERR ) | |
222 | { | |
223 | updater->get_logger()->print_error_setting_signal("SIGRTMIN"); | |
224 | return -1; | |
225 | } | |
5ac72dd8 BS |
226 | |
227 | return 0; | |
c5675c01 BS |
228 | } |
229 | ||
230 | ||
388f4ab0 | 231 | /** |
584b9407 BS |
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. | |
235 | */ | |
236 | int init_daemon_mode(bool daemon_mode) | |
237 | { | |
238 | updater->get_logger()->print_daemon_mode(daemon_mode); | |
239 | if ( daemon_mode == true ) | |
240 | { | |
241 | int pid = fork(); | |
242 | if ( pid < 0 ) | |
243 | { | |
244 | // error fork | |
245 | updater->get_logger()->print_error_fork(); | |
246 | return -1; | |
247 | } | |
248 | else if ( pid > 0 ) | |
249 | { | |
250 | // parent continues here | |
251 | if ( write_pidfile(pid) != 0 ) | |
252 | { | |
253 | if ( kill(pid,SIGTERM) != 0 ) | |
e304c27b | 254 | { |
584b9407 | 255 | updater->get_logger()->print_error_kill_child(pid); |
557b6f56 | 256 | shutdown_parent(false,-1); /*lint !e534 */ |
e304c27b | 257 | } |
584b9407 | 258 | else |
e304c27b | 259 | { |
584b9407 | 260 | updater->get_logger()->print_child_killed(pid); |
557b6f56 | 261 | shutdown_parent(true,-1); /*lint !e534 */ |
e304c27b | 262 | } |
584b9407 BS |
263 | } |
264 | updater->get_logger()->print_runnig_as_daemon(pid); | |
557b6f56 | 265 | shutdown_parent(false,0); /*lint !e534 */ |
584b9407 BS |
266 | } |
267 | // child starts here | |
268 | } | |
e304c27b BS |
269 | else |
270 | { | |
271 | if ( write_pidfile(getpid()) != 0 ) | |
272 | { | |
557b6f56 | 273 | shutdown(); /*lint !e534 */ |
e304c27b BS |
274 | exit(-1); |
275 | } | |
276 | } | |
584b9407 BS |
277 | return 0; |
278 | } | |
279 | ||
280 | /** | |
b1be615b BS |
281 | * @brief The main part. |
282 | * @param argc Number of arguments | |
283 | * @param argv Command line arguments | |
284 | * @return 0 if all is fine. | |
4545a371 BS |
285 | */ |
286 | int main(int argc, char *argv[]) | |
287 | { | |
38060291 | 288 | // initialize Updater |
c3c84086 | 289 | updater = Updater::Ptr(new Updater); |
38060291 | 290 | |
efbde536 BS |
291 | // load config and initialize helper classes |
292 | if ( updater->load_config(argc,argv) != 0 ) | |
667c672c | 293 | return -1; |
4545a371 | 294 | |
388f4ab0 | 295 | // open pidfile and check for running process |
c5675c01 | 296 | if ( check_for_running_process() != 0) |
667c672c | 297 | return -1; |
3434b35f | 298 | |
c5675c01 | 299 | // init signal handling |
8bca3c5d | 300 | if ( init_signals() != 0) |
667c672c | 301 | return -1; |
254bbf53 | 302 | |
584b9407 BS |
303 | // init daemon_mode if enabled |
304 | if ( init_daemon_mode(updater->get_config()->get_daemon_mode()) != 0 ) | |
305 | return -1; | |
388f4ab0 | 306 | |
dbaf4b42 | 307 | // Should we start in offline mode? |
a6aac246 TJ |
308 | bool is_online = !updater->get_config()->get_start_offline(); |
309 | bool webcheck_enabled = updater->get_config()->get_webcheck_enabled(); | |
dbaf4b42 | 310 | |
c5a6b1fe TJ |
311 | // One shot run if daemon mode is disabled |
312 | if (updater->get_config()->get_daemon_mode() != 1) | |
313 | exit_now = true; | |
314 | ||
388f4ab0 BS |
315 | // service processing starts here |
316 | do | |
317 | { | |
a6aac246 TJ |
318 | // Signal processing |
319 | if (caught_sig_usr1) | |
320 | { | |
321 | caught_sig_usr1 = false; | |
322 | updater->get_logger()->print_caught_siguser1(); | |
323 | ||
324 | // Go offline | |
325 | is_online = false; | |
326 | } else if (caught_sig_usr2) | |
327 | { | |
328 | caught_sig_usr2 = false; | |
329 | updater->get_logger()->print_caught_siguser2(); | |
330 | ||
331 | // Go online | |
332 | is_online = true; | |
333 | webcheck_enabled = false; | |
334 | } else if (caught_sig_rtmin1) | |
335 | { | |
336 | caught_sig_rtmin1 = false; | |
337 | updater->get_logger()->print_caught_sigrtmin(); | |
338 | ||
339 | // Go online - with webcheck | |
340 | is_online = true; | |
341 | webcheck_enabled = true; | |
342 | } | |
343 | ||
344 | // State handling | |
98dd88bd | 345 | if ( is_online == true ) |
c5675c01 | 346 | { |
46fffdd6 | 347 | // Check if webcheck_enabled differs due to caught singnal then set it in config correspondingly |
43f4565e | 348 | if ( updater->get_config()->get_webcheck_enabled() != webcheck_enabled ) /*lint !e731 */ |
46fffdd6 BS |
349 | updater->get_config()->set_webcheck_enabled(webcheck_enabled); |
350 | ||
c5675c01 BS |
351 | // update all configured services |
352 | updater->update_services(); | |
353 | } | |
8bca3c5d BS |
354 | else |
355 | { | |
50d63110 | 356 | // We are in offline mode, do nothing, expect printing "offline mode". |
8bca3c5d BS |
357 | updater->get_logger()->print_offline_mode(); |
358 | } | |
388f4ab0 | 359 | |
4f4a6039 TJ |
360 | if (need_config_reload) |
361 | { | |
c5a6b1fe | 362 | updater->get_logger()->print_caught_sighup(); |
4f4a6039 TJ |
363 | need_config_reload = false; |
364 | ||
365 | if ( updater->reload_config() != 0 ) | |
5b3f3f54 TJ |
366 | { |
367 | updater->get_logger()->print_conf_reload_failed_exit(); | |
4f4a6039 | 368 | exit(-1); |
5b3f3f54 | 369 | } |
4f4a6039 TJ |
370 | } |
371 | ||
a7beeb20 | 372 | // Snore, snore... don't hog the cpu if we are in daemon_mode. |
c5a6b1fe | 373 | if ( !exit_now ) |
557b6f56 | 374 | sleep(10); /*lint !e534 */ |
c5a6b1fe | 375 | } while ( !exit_now ); |
4545a371 | 376 | |
50d63110 | 377 | // Serialize services to save their actual state. |
e304c27b | 378 | if ( shutdown() != 0 ) |
667c672c | 379 | return -1; |
2bc1878a | 380 | |
4545a371 BS |
381 | return 0; |
382 | } |