Commit | Line | Data |
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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; |
c5a6b1fe | 29 | volatile bool exit_now = false; |
e4ebcadc | 30 | volatile bool caught_sig_hup = false; |
a6aac246 TJ |
31 | volatile bool caught_sig_usr1 = false; |
32 | volatile bool caught_sig_usr2 = false; | |
e4ebcadc | 33 | volatile bool caught_sig_rtmin = false; |
3f39b968 | 34 | volatile bool caught_sig_rtmax = false; |
e4ebcadc | 35 | volatile bool caught_sig_term = false; |
a6aac246 | 36 | |
4545a371 | 37 | /** |
388f4ab0 BS |
38 | * Checks if a bpdyndnsd process is already running. |
39 | * @param updater Shared Pointer to updater, needed for logging. | |
40 | * @return 0 if process not running already or pid of already running process. | |
41 | */ | |
c5675c01 | 42 | int check_for_running_process() |
388f4ab0 BS |
43 | { |
44 | ifstream pidfile(PIDFILE); | |
45 | if ( pidfile.is_open() ) | |
46 | { | |
47 | int pid; | |
48 | pidfile >> pid; | |
49 | if ( pid > 0 ) | |
50 | updater->get_logger()->print_pid_found(pid); | |
51 | else | |
52 | return 0; | |
53 | ||
54 | // check if process still running ret_val==-1 -> not runnig, ret_val==0 -> running | |
55 | if ( kill(pid,0) == 0) | |
56 | { | |
57 | updater->get_logger()->print_process_already_running(pid); | |
58 | pidfile.close(); | |
59 | return pid; | |
60 | } | |
61 | } | |
62 | pidfile.close(); | |
63 | return 0; | |
64 | } | |
65 | ||
c5675c01 BS |
66 | |
67 | /** | |
68 | * Writes the pid into the pidfile. | |
69 | * @param pid The process's pid. | |
70 | */ | |
667c672c | 71 | int write_pidfile(int pid) |
388f4ab0 BS |
72 | { |
73 | ofstream pidfile(PIDFILE); | |
74 | if ( pidfile.is_open() ) | |
75 | { | |
76 | pidfile << pid << endl; | |
77 | } | |
667c672c BS |
78 | else |
79 | { | |
80 | updater->get_logger()->print_error_opening_rw(PIDFILE); | |
81 | return -1; | |
82 | } | |
388f4ab0 | 83 | pidfile.close(); |
667c672c | 84 | return 0; |
388f4ab0 BS |
85 | } |
86 | ||
c5675c01 BS |
87 | |
88 | /** | |
e304c27b BS |
89 | * Parent shutdown function |
90 | * @return 0 if all is fine, -1 otherwise | |
91 | */ | |
92 | int shutdown_parent(bool remove_pid, int ret_val) | |
93 | { | |
94 | // starting shutdown_parent | |
95 | updater->get_logger()->print_starting_shutdown_parent(); | |
96 | ||
97 | // remove pidfile if requested | |
98 | if(remove_pid) | |
99 | unlink(PIDFILE); | |
100 | ||
101 | // shutdown parent complete | |
102 | updater->get_logger()->print_shutdown_parent_succeeded(); | |
103 | ||
104 | // release shared pointer | |
105 | updater.reset(); | |
106 | ||
107 | exit(ret_val); | |
108 | } | |
109 | ||
110 | ||
111 | /** | |
112 | * Shutdown function | |
113 | * @return 0 if all is fine, -1 otherwise | |
114 | */ | |
115 | int shutdown() | |
116 | { | |
117 | int ret_val = 0; | |
118 | ||
119 | // starting shutdown | |
120 | updater->get_logger()->print_starting_shutdown(); | |
121 | ||
122 | // serialize actual service objects | |
123 | if ( updater->get_service_holder()->serialize_services() != 0 ) | |
124 | ret_val = -1; | |
125 | ||
126 | // unlink pidfile | |
127 | unlink(PIDFILE); | |
128 | ||
129 | // shutdown complete | |
130 | updater->get_logger()->print_shutdown_succeeded(); | |
131 | ||
132 | // release shared pointer | |
133 | updater.reset(); | |
134 | ||
135 | return ret_val; | |
136 | } | |
137 | ||
138 | ||
139 | /** | |
e4ebcadc | 140 | * Signal SIGTERM caught (exit program) |
c5675c01 BS |
141 | * @param param Parameter from the signal interface. |
142 | */ | |
e4ebcadc | 143 | void sigterm_func(int param) |
c5675c01 | 144 | { |
212c7ac3 | 145 | caught_sig_term = true; |
08a5a621 | 146 | } /*lint !e715 */ |
c5675c01 BS |
147 | |
148 | ||
149 | /** | |
e4ebcadc | 150 | * Signal SIGUSR1 caught (switch to offline mode) |
c5675c01 BS |
151 | * @param param Parameter from the signal interface. |
152 | */ | |
e4ebcadc | 153 | void sigusr1_func(int param) |
c5675c01 | 154 | { |
a6aac246 | 155 | caught_sig_usr1 = true; |
08a5a621 | 156 | } /*lint !e715 */ |
c5675c01 BS |
157 | |
158 | ||
159 | /** | |
3f39b968 | 160 | * Signal SIGHUP caught (reload config and reset log level) |
39acb828 | 161 | * @param param Parameter from the signal interface. |
c5675c01 | 162 | */ |
e4ebcadc | 163 | void sighup_func(int param) |
c5675c01 | 164 | { |
e4ebcadc | 165 | caught_sig_hup = true; |
64ff14c3 BS |
166 | } /*lint !e715 */ |
167 | ||
168 | ||
169 | /** | |
e4ebcadc | 170 | * Signal SIGUSR2 caught (switch to online mode) |
64ff14c3 BS |
171 | * @param param Parameter from the signal interface. |
172 | */ | |
e4ebcadc | 173 | void sigusr2_func(int param) |
64ff14c3 | 174 | { |
a6aac246 | 175 | caught_sig_usr2 = true; |
64ff14c3 BS |
176 | } /*lint !e715 */ |
177 | ||
178 | ||
179 | /** | |
e4ebcadc | 180 | * Signal SIGRTMIN caught (switch to online mode with webcheck enabled) |
64ff14c3 BS |
181 | * @param param Parameter from the signal interface. |
182 | */ | |
e4ebcadc | 183 | void sigrtmin_func(int param) |
64ff14c3 | 184 | { |
e4ebcadc | 185 | caught_sig_rtmin = true; |
08a5a621 | 186 | } /*lint !e715 */ |
c5675c01 BS |
187 | |
188 | ||
189 | /** | |
3f39b968 TJ |
190 | * Signal SIGRTMAX caught (increase log level) |
191 | * @param param Parameter from the signal interface. | |
192 | */ | |
193 | void sigrtmax_func(int param) | |
194 | { | |
195 | caught_sig_rtmax = true; | |
196 | } /*lint !e715 */ | |
197 | ||
198 | ||
199 | /** | |
c5675c01 | 200 | * Initialize the signals we handle. |
e0080b78 | 201 | * @return 0 if all is fine, -1 on error. |
c5675c01 | 202 | */ |
8bca3c5d | 203 | int init_signals() |
c5675c01 | 204 | { |
8bca3c5d | 205 | sighandler_t ret_val; |
e4ebcadc | 206 | ret_val = signal(SIGTERM, sigterm_func); |
8bca3c5d | 207 | if ( ret_val == SIG_ERR ) |
667c672c BS |
208 | { |
209 | updater->get_logger()->print_error_setting_signal("SIGTERM"); | |
8bca3c5d | 210 | return -1; |
667c672c | 211 | } |
e4ebcadc | 212 | ret_val = signal(SIGUSR1, sigusr1_func); |
8bca3c5d | 213 | if ( ret_val == SIG_ERR ) |
667c672c BS |
214 | { |
215 | updater->get_logger()->print_error_setting_signal("SIGUSR1"); | |
8bca3c5d | 216 | return -1; |
667c672c | 217 | } |
e4ebcadc | 218 | ret_val = signal(SIGHUP, sighup_func); |
8bca3c5d | 219 | if ( ret_val == SIG_ERR ) |
667c672c BS |
220 | { |
221 | updater->get_logger()->print_error_setting_signal("SIGHUP"); | |
8bca3c5d | 222 | return -1; |
667c672c | 223 | } |
e4ebcadc | 224 | ret_val = signal(SIGUSR2, sigusr2_func); |
64ff14c3 BS |
225 | if ( ret_val == SIG_ERR ) |
226 | { | |
227 | updater->get_logger()->print_error_setting_signal("SIGUSR2"); | |
228 | return -1; | |
229 | } | |
e4ebcadc | 230 | ret_val = signal(SIGRTMIN, sigrtmin_func); |
64ff14c3 BS |
231 | if ( ret_val == SIG_ERR ) |
232 | { | |
233 | updater->get_logger()->print_error_setting_signal("SIGRTMIN"); | |
234 | return -1; | |
235 | } | |
3f39b968 TJ |
236 | ret_val = signal(SIGRTMAX, sigrtmax_func); |
237 | if ( ret_val == SIG_ERR ) | |
238 | { | |
239 | updater->get_logger()->print_error_setting_signal("SIGRTMAX"); | |
240 | return -1; | |
241 | } | |
5ac72dd8 BS |
242 | |
243 | return 0; | |
c5675c01 BS |
244 | } |
245 | ||
246 | ||
388f4ab0 | 247 | /** |
584b9407 BS |
248 | * Try to run in daemon mode if enabled in config. |
249 | * @param daemon_mode True if process should detach to init (run as daemon), false if not detach to init. | |
250 | * @return 0 if all is fine, -1 on error. | |
251 | */ | |
252 | int init_daemon_mode(bool daemon_mode) | |
253 | { | |
254 | updater->get_logger()->print_daemon_mode(daemon_mode); | |
255 | if ( daemon_mode == true ) | |
256 | { | |
257 | int pid = fork(); | |
258 | if ( pid < 0 ) | |
259 | { | |
260 | // error fork | |
261 | updater->get_logger()->print_error_fork(); | |
262 | return -1; | |
263 | } | |
264 | else if ( pid > 0 ) | |
265 | { | |
266 | // parent continues here | |
267 | if ( write_pidfile(pid) != 0 ) | |
268 | { | |
269 | if ( kill(pid,SIGTERM) != 0 ) | |
e304c27b | 270 | { |
584b9407 | 271 | updater->get_logger()->print_error_kill_child(pid); |
557b6f56 | 272 | shutdown_parent(false,-1); /*lint !e534 */ |
e304c27b | 273 | } |
584b9407 | 274 | else |
e304c27b | 275 | { |
584b9407 | 276 | updater->get_logger()->print_child_killed(pid); |
557b6f56 | 277 | shutdown_parent(true,-1); /*lint !e534 */ |
e304c27b | 278 | } |
584b9407 BS |
279 | } |
280 | updater->get_logger()->print_runnig_as_daemon(pid); | |
557b6f56 | 281 | shutdown_parent(false,0); /*lint !e534 */ |
584b9407 BS |
282 | } |
283 | // child starts here | |
284 | } | |
e304c27b BS |
285 | else |
286 | { | |
287 | if ( write_pidfile(getpid()) != 0 ) | |
288 | { | |
557b6f56 | 289 | shutdown(); /*lint !e534 */ |
e304c27b BS |
290 | exit(-1); |
291 | } | |
292 | } | |
584b9407 BS |
293 | return 0; |
294 | } | |
295 | ||
296 | /** | |
b1be615b BS |
297 | * @brief The main part. |
298 | * @param argc Number of arguments | |
299 | * @param argv Command line arguments | |
300 | * @return 0 if all is fine. | |
4545a371 BS |
301 | */ |
302 | int main(int argc, char *argv[]) | |
303 | { | |
38060291 | 304 | // initialize Updater |
c3c84086 | 305 | updater = Updater::Ptr(new Updater); |
38060291 | 306 | |
efbde536 BS |
307 | // load config and initialize helper classes |
308 | if ( updater->load_config(argc,argv) != 0 ) | |
667c672c | 309 | return -1; |
4545a371 | 310 | |
388f4ab0 | 311 | // open pidfile and check for running process |
c5675c01 | 312 | if ( check_for_running_process() != 0) |
667c672c | 313 | return -1; |
3434b35f | 314 | |
c5675c01 | 315 | // init signal handling |
8bca3c5d | 316 | if ( init_signals() != 0) |
667c672c | 317 | return -1; |
254bbf53 | 318 | |
584b9407 BS |
319 | // init daemon_mode if enabled |
320 | if ( init_daemon_mode(updater->get_config()->get_daemon_mode()) != 0 ) | |
321 | return -1; | |
388f4ab0 | 322 | |
dbaf4b42 | 323 | // Should we start in offline mode? |
d55e13a6 | 324 | bool old_online_state = false; |
a6aac246 TJ |
325 | bool is_online = !updater->get_config()->get_start_offline(); |
326 | bool webcheck_enabled = updater->get_config()->get_webcheck_enabled(); | |
dbaf4b42 | 327 | |
c5a6b1fe TJ |
328 | // One shot run if daemon mode is disabled |
329 | if (updater->get_config()->get_daemon_mode() != 1) | |
330 | exit_now = true; | |
331 | ||
e38d7604 TJ |
332 | // Tell the world we are running |
333 | updater->get_logger()->print_started(); | |
334 | ||
3f39b968 TJ |
335 | int original_log_level = updater->get_logger()->get_loglevel(); |
336 | ||
388f4ab0 BS |
337 | // service processing starts here |
338 | do | |
339 | { | |
a6aac246 TJ |
340 | // Signal processing |
341 | if (caught_sig_usr1) | |
342 | { | |
343 | caught_sig_usr1 = false; | |
344 | updater->get_logger()->print_caught_siguser1(); | |
345 | ||
346 | // Go offline | |
347 | is_online = false; | |
348 | } else if (caught_sig_usr2) | |
349 | { | |
350 | caught_sig_usr2 = false; | |
351 | updater->get_logger()->print_caught_siguser2(); | |
352 | ||
353 | // Go online | |
354 | is_online = true; | |
355 | webcheck_enabled = false; | |
e4ebcadc | 356 | } else if (caught_sig_rtmin) |
a6aac246 | 357 | { |
e4ebcadc | 358 | caught_sig_rtmin = false; |
a6aac246 TJ |
359 | updater->get_logger()->print_caught_sigrtmin(); |
360 | ||
361 | // Go online - with webcheck | |
362 | is_online = true; | |
363 | webcheck_enabled = true; | |
3f39b968 TJ |
364 | } else if (caught_sig_rtmax) |
365 | { | |
366 | caught_sig_rtmax = false; | |
367 | ||
368 | // Increase log level | |
369 | int new_loglevel = updater->get_logger()->get_loglevel() + 1; | |
370 | updater->get_logger()->print_caught_sigrtmax(new_loglevel); | |
371 | updater->get_logger()->set_loglevel(new_loglevel); | |
212c7ac3 TJ |
372 | } else if (caught_sig_term) |
373 | { | |
e4ebcadc | 374 | caught_sig_term = false; |
212c7ac3 TJ |
375 | updater->get_logger()->print_caught_sigterm(); |
376 | ||
377 | exit_now = true; | |
e4ebcadc TJ |
378 | } else if (caught_sig_hup) |
379 | { | |
380 | caught_sig_hup = false; | |
381 | updater->get_logger()->print_caught_sighup(); | |
382 | ||
383 | if ( updater->reload_config() != 0 ) | |
384 | { | |
385 | updater->get_logger()->print_conf_reload_failed_exit(); | |
386 | exit(-1); | |
387 | } | |
3f39b968 TJ |
388 | |
389 | // Reset log level to startup log level in case it got elevated by SIGRTMAX | |
390 | updater->get_logger()->set_loglevel(original_log_level); | |
a6aac246 TJ |
391 | } |
392 | ||
393 | // State handling | |
98dd88bd | 394 | if ( is_online == true ) |
c5675c01 | 395 | { |
46fffdd6 | 396 | // Check if webcheck_enabled differs due to caught singnal then set it in config correspondingly |
43f4565e | 397 | if ( updater->get_config()->get_webcheck_enabled() != webcheck_enabled ) /*lint !e731 */ |
46fffdd6 BS |
398 | updater->get_config()->set_webcheck_enabled(webcheck_enabled); |
399 | ||
c5675c01 | 400 | // update all configured services |
d55e13a6 | 401 | updater->update_services(is_online != old_online_state); |
c5675c01 | 402 | } |
8bca3c5d BS |
403 | else |
404 | { | |
50d63110 | 405 | // We are in offline mode, do nothing, expect printing "offline mode". |
8bca3c5d BS |
406 | updater->get_logger()->print_offline_mode(); |
407 | } | |
388f4ab0 | 408 | |
d55e13a6 TJ |
409 | // Keep old online state so we can determine |
410 | // if we switched from offline to online | |
411 | old_online_state = is_online; | |
412 | ||
a7beeb20 | 413 | // Snore, snore... don't hog the cpu if we are in daemon_mode. |
c5a6b1fe | 414 | if ( !exit_now ) |
557b6f56 | 415 | sleep(10); /*lint !e534 */ |
c5a6b1fe | 416 | } while ( !exit_now ); |
4545a371 | 417 | |
50d63110 | 418 | // Serialize services to save their actual state. |
e304c27b | 419 | if ( shutdown() != 0 ) |
667c672c | 420 | return -1; |
2bc1878a | 421 | |
4545a371 BS |
422 | return 0; |
423 | } |