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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; |
a292c8c4 TJ |
29 | volatile bool is_online = false; |
30 | volatile bool webcheck_enabled = false; | |
c5675c01 | 31 | |
4545a371 | 32 | /** |
388f4ab0 BS |
33 | * Checks if a bpdyndnsd process is already running. |
34 | * @param updater Shared Pointer to updater, needed for logging. | |
35 | * @return 0 if process not running already or pid of already running process. | |
36 | */ | |
c5675c01 | 37 | int check_for_running_process() |
388f4ab0 BS |
38 | { |
39 | ifstream pidfile(PIDFILE); | |
40 | if ( pidfile.is_open() ) | |
41 | { | |
42 | int pid; | |
43 | pidfile >> pid; | |
44 | if ( pid > 0 ) | |
45 | updater->get_logger()->print_pid_found(pid); | |
46 | else | |
47 | return 0; | |
48 | ||
49 | // check if process still running ret_val==-1 -> not runnig, ret_val==0 -> running | |
50 | if ( kill(pid,0) == 0) | |
51 | { | |
52 | updater->get_logger()->print_process_already_running(pid); | |
53 | pidfile.close(); | |
54 | return pid; | |
55 | } | |
56 | } | |
57 | pidfile.close(); | |
58 | return 0; | |
59 | } | |
60 | ||
c5675c01 BS |
61 | |
62 | /** | |
63 | * Writes the pid into the pidfile. | |
64 | * @param pid The process's pid. | |
65 | */ | |
667c672c | 66 | int write_pidfile(int pid) |
388f4ab0 BS |
67 | { |
68 | ofstream pidfile(PIDFILE); | |
69 | if ( pidfile.is_open() ) | |
70 | { | |
71 | pidfile << pid << endl; | |
72 | } | |
667c672c BS |
73 | else |
74 | { | |
75 | updater->get_logger()->print_error_opening_rw(PIDFILE); | |
76 | return -1; | |
77 | } | |
388f4ab0 | 78 | pidfile.close(); |
667c672c | 79 | return 0; |
388f4ab0 BS |
80 | } |
81 | ||
c5675c01 BS |
82 | |
83 | /** | |
e304c27b BS |
84 | * Parent shutdown function |
85 | * @return 0 if all is fine, -1 otherwise | |
86 | */ | |
87 | int shutdown_parent(bool remove_pid, int ret_val) | |
88 | { | |
89 | // starting shutdown_parent | |
90 | updater->get_logger()->print_starting_shutdown_parent(); | |
91 | ||
92 | // remove pidfile if requested | |
93 | if(remove_pid) | |
94 | unlink(PIDFILE); | |
95 | ||
96 | // shutdown parent complete | |
97 | updater->get_logger()->print_shutdown_parent_succeeded(); | |
98 | ||
99 | // release shared pointer | |
100 | updater.reset(); | |
101 | ||
102 | exit(ret_val); | |
103 | } | |
104 | ||
105 | ||
106 | /** | |
107 | * Shutdown function | |
108 | * @return 0 if all is fine, -1 otherwise | |
109 | */ | |
110 | int shutdown() | |
111 | { | |
112 | int ret_val = 0; | |
113 | ||
114 | // starting shutdown | |
115 | updater->get_logger()->print_starting_shutdown(); | |
116 | ||
117 | // serialize actual service objects | |
118 | if ( updater->get_service_holder()->serialize_services() != 0 ) | |
119 | ret_val = -1; | |
120 | ||
121 | // unlink pidfile | |
122 | unlink(PIDFILE); | |
123 | ||
124 | // shutdown complete | |
125 | updater->get_logger()->print_shutdown_succeeded(); | |
126 | ||
127 | // release shared pointer | |
128 | updater.reset(); | |
129 | ||
130 | return ret_val; | |
131 | } | |
132 | ||
133 | ||
134 | /** | |
c5675c01 BS |
135 | * Signal SIGTERM caught, releasing resources and exit. |
136 | * @param param Parameter from the signal interface. | |
137 | */ | |
138 | void terminate(int param) | |
139 | { | |
140 | updater->get_logger()->print_caught_sigterm(); | |
2bc1878a | 141 | |
e304c27b | 142 | exit(shutdown()); |
08a5a621 | 143 | } /*lint !e715 */ |
c5675c01 BS |
144 | |
145 | ||
146 | /** | |
147 | * Signal SIGUSR1 caught, switching to offline mode. | |
148 | * @param param Parameter from the signal interface. | |
149 | */ | |
150 | void switch_to_offline(int param) | |
151 | { | |
8bca3c5d | 152 | updater->get_logger()->print_caught_siguser1(); |
98dd88bd | 153 | is_online = false; |
08a5a621 | 154 | } /*lint !e715 */ |
c5675c01 BS |
155 | |
156 | ||
157 | /** | |
64ff14c3 | 158 | * Signal SIGHUP caught, reloading config. |
39acb828 | 159 | * @param param Parameter from the signal interface. |
c5675c01 BS |
160 | */ |
161 | void reload_config(int param) | |
162 | { | |
8bca3c5d | 163 | updater->get_logger()->print_caught_sighup(); |
667c672c BS |
164 | if ( updater->reload_config() != 0 ) |
165 | exit(-1); | |
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 | { | |
175 | updater->get_logger()->print_caught_siguser2(); | |
98dd88bd | 176 | is_online = true; |
64ff14c3 BS |
177 | webcheck_enabled = false; |
178 | } /*lint !e715 */ | |
179 | ||
180 | ||
181 | /** | |
182 | * Signal SIGRTMIN caught, switching to online mode with webcheck enabled. | |
183 | * @param param Parameter from the signal interface. | |
184 | */ | |
185 | void switch_to_online_webcheck(int param) | |
186 | { | |
187 | updater->get_logger()->print_caught_sigrtmin(); | |
188 | is_online = true; | |
189 | webcheck_enabled = true; | |
08a5a621 | 190 | } /*lint !e715 */ |
c5675c01 BS |
191 | |
192 | ||
193 | /** | |
194 | * Initialize the signals we handle. | |
e0080b78 | 195 | * @return 0 if all is fine, -1 on error. |
c5675c01 | 196 | */ |
8bca3c5d | 197 | int init_signals() |
c5675c01 | 198 | { |
8bca3c5d BS |
199 | sighandler_t ret_val; |
200 | ret_val = signal(SIGTERM,terminate); | |
201 | if ( ret_val == SIG_ERR ) | |
667c672c BS |
202 | { |
203 | updater->get_logger()->print_error_setting_signal("SIGTERM"); | |
8bca3c5d | 204 | return -1; |
667c672c | 205 | } |
8bca3c5d BS |
206 | ret_val = signal(SIGUSR1,switch_to_offline); |
207 | if ( ret_val == SIG_ERR ) | |
667c672c BS |
208 | { |
209 | updater->get_logger()->print_error_setting_signal("SIGUSR1"); | |
8bca3c5d | 210 | return -1; |
667c672c | 211 | } |
8bca3c5d BS |
212 | ret_val = signal(SIGHUP,reload_config); |
213 | if ( ret_val == SIG_ERR ) | |
667c672c BS |
214 | { |
215 | updater->get_logger()->print_error_setting_signal("SIGHUP"); | |
8bca3c5d | 216 | return -1; |
667c672c | 217 | } |
64ff14c3 BS |
218 | ret_val = signal(SIGUSR2,switch_to_online); |
219 | if ( ret_val == SIG_ERR ) | |
220 | { | |
221 | updater->get_logger()->print_error_setting_signal("SIGUSR2"); | |
222 | return -1; | |
223 | } | |
224 | ret_val = signal(SIGRTMIN,switch_to_online_webcheck); | |
225 | if ( ret_val == SIG_ERR ) | |
226 | { | |
227 | updater->get_logger()->print_error_setting_signal("SIGRTMIN"); | |
228 | return -1; | |
229 | } | |
5ac72dd8 BS |
230 | |
231 | return 0; | |
c5675c01 BS |
232 | } |
233 | ||
234 | ||
388f4ab0 | 235 | /** |
584b9407 BS |
236 | * Try to run in daemon mode if enabled in config. |
237 | * @param daemon_mode True if process should detach to init (run as daemon), false if not detach to init. | |
238 | * @return 0 if all is fine, -1 on error. | |
239 | */ | |
240 | int init_daemon_mode(bool daemon_mode) | |
241 | { | |
242 | updater->get_logger()->print_daemon_mode(daemon_mode); | |
243 | if ( daemon_mode == true ) | |
244 | { | |
245 | int pid = fork(); | |
246 | if ( pid < 0 ) | |
247 | { | |
248 | // error fork | |
249 | updater->get_logger()->print_error_fork(); | |
250 | return -1; | |
251 | } | |
252 | else if ( pid > 0 ) | |
253 | { | |
254 | // parent continues here | |
255 | if ( write_pidfile(pid) != 0 ) | |
256 | { | |
257 | if ( kill(pid,SIGTERM) != 0 ) | |
e304c27b | 258 | { |
584b9407 | 259 | updater->get_logger()->print_error_kill_child(pid); |
557b6f56 | 260 | shutdown_parent(false,-1); /*lint !e534 */ |
e304c27b | 261 | } |
584b9407 | 262 | else |
e304c27b | 263 | { |
584b9407 | 264 | updater->get_logger()->print_child_killed(pid); |
557b6f56 | 265 | shutdown_parent(true,-1); /*lint !e534 */ |
e304c27b | 266 | } |
584b9407 BS |
267 | } |
268 | updater->get_logger()->print_runnig_as_daemon(pid); | |
557b6f56 | 269 | shutdown_parent(false,0); /*lint !e534 */ |
584b9407 BS |
270 | } |
271 | // child starts here | |
272 | } | |
e304c27b BS |
273 | else |
274 | { | |
275 | if ( write_pidfile(getpid()) != 0 ) | |
276 | { | |
557b6f56 | 277 | shutdown(); /*lint !e534 */ |
e304c27b BS |
278 | exit(-1); |
279 | } | |
280 | } | |
584b9407 BS |
281 | return 0; |
282 | } | |
283 | ||
284 | /** | |
b1be615b BS |
285 | * @brief The main part. |
286 | * @param argc Number of arguments | |
287 | * @param argv Command line arguments | |
288 | * @return 0 if all is fine. | |
4545a371 BS |
289 | */ |
290 | int main(int argc, char *argv[]) | |
291 | { | |
38060291 | 292 | // initialize Updater |
c3c84086 | 293 | updater = Updater::Ptr(new Updater); |
38060291 | 294 | |
efbde536 BS |
295 | // load config and initialize helper classes |
296 | if ( updater->load_config(argc,argv) != 0 ) | |
667c672c | 297 | return -1; |
4545a371 | 298 | |
388f4ab0 | 299 | // open pidfile and check for running process |
c5675c01 | 300 | if ( check_for_running_process() != 0) |
667c672c | 301 | return -1; |
3434b35f | 302 | |
c5675c01 | 303 | // init signal handling |
8bca3c5d | 304 | if ( init_signals() != 0) |
667c672c | 305 | return -1; |
254bbf53 | 306 | |
584b9407 BS |
307 | // init daemon_mode if enabled |
308 | if ( init_daemon_mode(updater->get_config()->get_daemon_mode()) != 0 ) | |
309 | return -1; | |
388f4ab0 | 310 | |
dbaf4b42 BS |
311 | // Should we start in offline mode? |
312 | is_online = !updater->get_config()->get_start_offline(); | |
46fffdd6 | 313 | webcheck_enabled = updater->get_config()->get_webcheck_enabled(); |
dbaf4b42 | 314 | |
388f4ab0 BS |
315 | // service processing starts here |
316 | do | |
317 | { | |
98dd88bd | 318 | if ( is_online == true ) |
c5675c01 | 319 | { |
46fffdd6 | 320 | // Check if webcheck_enabled differs due to caught singnal then set it in config correspondingly |
43f4565e | 321 | if ( updater->get_config()->get_webcheck_enabled() != webcheck_enabled ) /*lint !e731 */ |
46fffdd6 BS |
322 | updater->get_config()->set_webcheck_enabled(webcheck_enabled); |
323 | ||
c5675c01 BS |
324 | // update all configured services |
325 | updater->update_services(); | |
326 | } | |
8bca3c5d BS |
327 | else |
328 | { | |
50d63110 | 329 | // We are in offline mode, do nothing, expect printing "offline mode". |
8bca3c5d BS |
330 | updater->get_logger()->print_offline_mode(); |
331 | } | |
388f4ab0 | 332 | |
a7beeb20 | 333 | // Snore, snore... don't hog the cpu if we are in daemon_mode. |
59c8d63c | 334 | if ( updater->get_config()->get_daemon_mode() == 1 ) |
557b6f56 | 335 | sleep(10); /*lint !e534 */ |
59c8d63c BS |
336 | |
337 | }while ( updater->get_config()->get_daemon_mode() == 1 ); | |
4545a371 | 338 | |
50d63110 | 339 | // Serialize services to save their actual state. |
e304c27b | 340 | if ( shutdown() != 0 ) |
667c672c | 341 | return -1; |
2bc1878a | 342 | |
4545a371 BS |
343 | return 0; |
344 | } |