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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 | ||
14 | #define VERSION 0 | |
15 | #define REVISION 1 | |
16 | #define RELEASE 0 | |
17 | ||
388f4ab0 | 18 | #define PIDFILE "/var/run/bpdyndnsd.pid" |
27baf279 | 19 | #define OBJECT_FILE "/home/bjoern/intranator/bpdyndnsd/objects.ser" |
388f4ab0 | 20 | |
4545a371 | 21 | #include <iostream> |
88a594e8 | 22 | #include <fstream> |
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23 | #include <list> |
24 | #include <string> | |
4545a371 | 25 | #include <boost/foreach.hpp> |
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26 | #include <sys/types.h> |
27 | #include <signal.h> | |
28 | ||
29 | #include "updater.h" | |
4545a371 | 30 | |
4545a371 | 31 | #include "config.cpp" |
88a594e8 | 32 | #include "dhs.cpp" |
254bbf53 | 33 | #include "logger.cpp" |
88a594e8 | 34 | #include "ods.cpp" |
4545a371 | 35 | #include "service.cpp" |
27baf279 | 36 | #include "serviceholder.cpp" |
88a594e8 | 37 | #include "updater.cpp" |
4545a371 | 38 | |
388f4ab0 | 39 | |
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40 | using namespace std; |
41 | ||
88a594e8 | 42 | Updater::Ptr updater; |
98dd88bd | 43 | bool is_online = true; |
c5675c01 | 44 | |
4545a371 | 45 | /** |
388f4ab0 BS |
46 | * Checks if a bpdyndnsd process is already running. |
47 | * @param updater Shared Pointer to updater, needed for logging. | |
48 | * @return 0 if process not running already or pid of already running process. | |
49 | */ | |
c5675c01 | 50 | int check_for_running_process() |
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51 | { |
52 | ifstream pidfile(PIDFILE); | |
53 | if ( pidfile.is_open() ) | |
54 | { | |
55 | int pid; | |
56 | pidfile >> pid; | |
57 | if ( pid > 0 ) | |
58 | updater->get_logger()->print_pid_found(pid); | |
59 | else | |
60 | return 0; | |
61 | ||
62 | // check if process still running ret_val==-1 -> not runnig, ret_val==0 -> running | |
63 | if ( kill(pid,0) == 0) | |
64 | { | |
65 | updater->get_logger()->print_process_already_running(pid); | |
66 | pidfile.close(); | |
67 | return pid; | |
68 | } | |
69 | } | |
70 | pidfile.close(); | |
71 | return 0; | |
72 | } | |
73 | ||
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74 | |
75 | /** | |
76 | * Writes the pid into the pidfile. | |
77 | * @param pid The process's pid. | |
78 | */ | |
667c672c | 79 | int write_pidfile(int pid) |
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80 | { |
81 | ofstream pidfile(PIDFILE); | |
82 | if ( pidfile.is_open() ) | |
83 | { | |
84 | pidfile << pid << endl; | |
85 | } | |
667c672c BS |
86 | else |
87 | { | |
88 | updater->get_logger()->print_error_opening_rw(PIDFILE); | |
89 | return -1; | |
90 | } | |
388f4ab0 | 91 | pidfile.close(); |
667c672c | 92 | return 0; |
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93 | } |
94 | ||
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95 | |
96 | /** | |
97 | * Signal SIGTERM caught, releasing resources and exit. | |
98 | * @param param Parameter from the signal interface. | |
99 | */ | |
100 | void terminate(int param) | |
101 | { | |
102 | updater->get_logger()->print_caught_sigterm(); | |
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103 | |
104 | // unfortunately we can't call serialize_services in any destructor | |
105 | // cause some singleton are already destroyed !?! | |
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106 | if ( updater->get_config()->serialize_services() != 0 ) |
107 | { | |
108 | updater.reset(); | |
109 | exit(-1); | |
110 | } | |
c5675c01 | 111 | updater.reset(); |
39acb828 | 112 | exit(0); |
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113 | } |
114 | ||
115 | ||
2bc1878a | 116 | |
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117 | /** |
118 | * Signal SIGUSR1 caught, switching to offline mode. | |
119 | * @param param Parameter from the signal interface. | |
120 | */ | |
121 | void switch_to_offline(int param) | |
122 | { | |
8bca3c5d | 123 | updater->get_logger()->print_caught_siguser1(); |
98dd88bd | 124 | is_online = false; |
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125 | } |
126 | ||
127 | ||
128 | /** | |
129 | * Signal SIGHUP caught, reloading config and switching to online mode. | |
39acb828 | 130 | * @param param Parameter from the signal interface. |
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131 | */ |
132 | void reload_config(int param) | |
133 | { | |
8bca3c5d | 134 | updater->get_logger()->print_caught_sighup(); |
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135 | if ( updater->reload_config() != 0 ) |
136 | exit(-1); | |
98dd88bd | 137 | is_online = true; |
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138 | } |
139 | ||
140 | ||
141 | /** | |
142 | * Initialize the signals we handle. | |
143 | */ | |
8bca3c5d | 144 | int init_signals() |
c5675c01 | 145 | { |
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146 | sighandler_t ret_val; |
147 | ret_val = signal(SIGTERM,terminate); | |
148 | if ( ret_val == SIG_ERR ) | |
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149 | { |
150 | updater->get_logger()->print_error_setting_signal("SIGTERM"); | |
8bca3c5d | 151 | return -1; |
667c672c | 152 | } |
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153 | ret_val = signal(SIGUSR1,switch_to_offline); |
154 | if ( ret_val == SIG_ERR ) | |
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155 | { |
156 | updater->get_logger()->print_error_setting_signal("SIGUSR1"); | |
8bca3c5d | 157 | return -1; |
667c672c | 158 | } |
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159 | ret_val = signal(SIGHUP,reload_config); |
160 | if ( ret_val == SIG_ERR ) | |
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161 | { |
162 | updater->get_logger()->print_error_setting_signal("SIGHUP"); | |
8bca3c5d | 163 | return -1; |
667c672c | 164 | } |
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165 | |
166 | return 0; | |
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167 | } |
168 | ||
169 | ||
388f4ab0 | 170 | /** |
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171 | * @brief The main part. |
172 | * @param argc Number of arguments | |
173 | * @param argv Command line arguments | |
174 | * @return 0 if all is fine. | |
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175 | */ |
176 | int main(int argc, char *argv[]) | |
177 | { | |
38060291 | 178 | // initialize Updater |
88a594e8 | 179 | Updater::Ptr _updater(new Updater); |
c5675c01 BS |
180 | updater = _updater; |
181 | _updater.reset(); | |
38060291 | 182 | |
254bbf53 | 183 | // load the cmd options |
38060291 | 184 | if ( updater->init_config_from_cmd(argc,argv) != 0 ) |
667c672c | 185 | return -1; |
38060291 | 186 | |
254bbf53 | 187 | // load the config and service files |
38060291 | 188 | if ( updater->init_config_from_files() != 0 ) |
667c672c | 189 | return -1; |
4545a371 | 190 | |
388f4ab0 | 191 | // open pidfile and check for running process |
c5675c01 | 192 | if ( check_for_running_process() != 0) |
667c672c | 193 | return -1; |
3434b35f | 194 | |
c5675c01 | 195 | // init signal handling |
8bca3c5d | 196 | if ( init_signals() != 0) |
667c672c | 197 | return -1; |
254bbf53 | 198 | |
667c672c | 199 | // initialize daemon mode if configured TODO: into separate function |
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200 | updater->get_logger()->print_daemon_mode(updater->get_config()->get_daemon_mode()); |
201 | if ( updater->get_config()->get_daemon_mode() == 1 ) | |
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202 | { |
203 | int pid = fork(); | |
204 | if ( pid < 0 ) | |
205 | { | |
206 | // error fork | |
207 | updater->get_logger()->print_error_fork(); | |
667c672c | 208 | return -1; |
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209 | } |
210 | else if ( pid > 0 ) | |
211 | { | |
212 | // parent | |
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213 | if ( write_pidfile(pid) != 0 ) |
214 | { | |
215 | if ( kill(pid,SIGTERM) != 0 ) | |
216 | updater->get_logger()->print_error_kill_child(pid); | |
217 | return -1; | |
218 | } | |
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219 | updater->get_logger()->print_runnig_as_daemon(pid); |
220 | return 0; | |
221 | } | |
222 | // child starts here | |
223 | } | |
224 | ||
225 | // service processing starts here | |
226 | do | |
227 | { | |
98dd88bd | 228 | if ( is_online == true ) |
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229 | { |
230 | // update all configured services | |
231 | updater->update_services(); | |
232 | } | |
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233 | else |
234 | { | |
235 | updater->get_logger()->print_offline_mode(); | |
236 | } | |
388f4ab0 | 237 | |
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238 | if ( updater->get_config()->get_daemon_mode() == 1 ) |
239 | sleep(10); // TODO: in a final release, correct the sleep value to something suitable | |
240 | ||
241 | }while ( updater->get_config()->get_daemon_mode() == 1 ); | |
4545a371 | 242 | |
2bc1878a | 243 | |
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244 | // serialize services to save their actual status |
245 | if ( updater->get_config()->serialize_services() != 0 ) | |
246 | return -1; | |
2bc1878a | 247 | |
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248 | return 0; |
249 | } |