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authorMichael Krelin <hacker@klever.net>2004-07-09 16:48:52 (UTC)
committer Michael Krelin <hacker@klever.net>2004-07-09 16:48:52 (UTC)
commit9148dac885c0325636c2d33715ba248371706d0d (patch) (unidiff)
treefd95d60f6fd051c3ad46a966882e2be48440452f /src/dudki.cc
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dudki: initial import into svn repository
Diffstat (limited to 'src/dudki.cc') (more/less context) (ignore whitespace changes)
-rw-r--r--src/dudki.cc244
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diff --git a/src/dudki.cc b/src/dudki.cc
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1#include <unistd.h>
2#include <signal.h>
3#include <syslog.h>
4#include <iostream>
5#include <fstream>
6#include <stdexcept>
7using namespace std;
8#include "configuration.h"
9#include "util.h"
10
11#include "config.h"
12#ifdef HAVE_GETOPT_H
13# include <getopt.h>
14#endif
15
16#ifndef DEFAULT_CONF_FILE
17# define DEFAULT_CONF_FILE "/etc/dudki.conf"
18#endif
19
20#define PHEADER PACKAGE " Version " VERSION
21#define PCOPY "Copyright (c) 2004 Klever Group"
22
23bool finishing = false;
24static char **_argv = NULL;
25
26static void lethal_signal_handler(int signum) {
27 syslog(LOG_NOTICE,"Lethal signal received. Terminating.");
28 finishing = true;
29}
30static void sighup_handler(int signum) {
31 syslog(LOG_NOTICE,"SUGHUP received, reloading.");
32 execvp(_argv[0],_argv);
33}
34
35void check_herd(configuration& config) {
36 for(processes_t::iterator i=config.processes.begin();i!=config.processes.end();++i)
37 i->second.check(i->first,config);
38}
39
40void signal_self(const configuration& config,int signum) {
41 ifstream pids(config.pidfile.c_str(),ios::in);
42 if(!pids)
43 throw runtime_error("Can't detect running instance");
44 pid_t pid = 0;
45 pids >> pid;
46 if(!pid)
47 throw runtime_error("Can't detect running instance");
48 if(pid==getpid())
49 throw 0;
50 if(kill(pid,signum))
51 throw runtime_error("Failed to signal running instance");
52}
53
54int main(int argc,char **argv) {
55 try {
56 _argv = new char*[argc+1];
57 if(!_argv)
58 throw runtime_error("memory allocation problem at the very start");
59 memmove(_argv,argv,sizeof(*_argv)*(argc+1));
60 string config_file = DEFAULT_CONF_FILE;
61 enum {
62 op_default,
63 op_work,
64 op_hup,
65 op_term,
66 op_check,
67 op_ensure,
68 op_test
69 } op = op_default;
70 while(true) {
71 #defineSHORTOPTSTRING "f:hVLrkcet"
72#ifdef HAVE_GETOPT_LONG
73 static struct option opts[] = {
74 { "help", no_argument, 0, 'h' },
75 { "usage", no_argument, 0, 'h' },
76 { "version", no_argument, 0, 'V' },
77 { "license", no_argument, 0, 'L' },
78 { "config", required_argument, 0, 'f' },
79 { "kill", no_argument, 0, 'k' },
80 { "reload", no_argument, 0, 'r' },
81 { "check", no_argument, 0, 'c' },
82 { "ensure", no_argument, 0, 'e' },
83 { "test", no_argument, 0, 't' },
84 { NULL, 0, 0, 0 }
85 };
86 int c = getopt_long(argc,argv,SHORTOPTSTRING,opts,NULL);
87#else /* !HAVE_GETOPT_LONG */
88 int c = getopt(argc,argv,SHORTOPTSTRING);
89#endif /* /HAVE_GETOPT_LONG */
90 if(c==-1)
91 break;
92 switch(c) {
93 case 'h':
94 cerr << PHEADER << endl
95 << PCOPY << endl << endl <<
96#ifdef HAVE_GETOPT_LONG
97 " -h, --help\n"
98 " --usage display this text\n"
99 " -V, --version display version number\n"
100 " -L, --license show license\n"
101 " -f filename, --config=filename\n"
102 " specify the configuration file to use\n"
103 "\n"
104 " -k, --kill stop running instance\n"
105 " -r, --reload reload running instance (send SIGHUP)\n"
106 " -c, --check check if dudki is running\n"
107 " -e, --ensure ensure that dudki is running\n"
108 " -t, --test test configuration file and exit"
109#else /* !HAVE_GETOPT_LONG */
110 " -h display this text\n"
111 " -V display version number\n"
112 " -L show license\n"
113 " -f filename specify the configuration file to use\n"
114 "\n"
115 " -k stop running instance\n"
116 " -r reload running instance (send SIGHUP)\n"
117 " -c check if dudki is running\n"
118 " -e ensure that dudki is running\n"
119 " -t test configuration file and exit"
120#endif /* /HAVE_GETOPT_LONG */
121 << endl;
122 exit(0);
123 break;
124 case 'V':
125 cerr << VERSION << endl;
126 exit(0);
127 break;
128 case 'L':
129 extern const char *COPYING;
130 cerr << COPYING << endl;
131 exit(0);
132 break;
133 case 'f':
134 config_file = optarg;
135 break;
136 case 'k':
137 if(op!=op_default) {
138 cerr << "Can't obey two or more orders at once" << endl;
139 exit(1);
140 }
141 op = op_term;
142 break;
143 case 'r':
144 if(op!=op_default) {
145 cerr << "Can't obey two or more orders at once" << endl;
146 exit(1);
147 }
148 op = op_hup;
149 break;
150 case 'c':
151 if(op!=op_default) {
152 cerr << "Can't obey two or more orders at once" << endl;
153 exit(1);
154 }
155 op = op_check;
156 break;
157 case 'e':
158 if(op!=op_default) {
159 cerr << "Can't obey two or more orders at once" << endl;
160 exit(1);
161 }
162 op = op_ensure;
163 break;
164 case 't':
165 if(op!=op_default) {
166 cerr << "Can't obey two or more orders at once" << endl;
167 exit(1);
168 }
169 op = op_test;
170 break;
171 default:
172 cerr << "Huh??" << endl;
173 exit(1);
174 break;
175 }
176 }
177 const char *sid = *argv;
178 const char *t;
179 while(t = index(sid,'/')) {
180 sid = t; sid++;
181 }
182 openlog(sid,LOG_CONS|LOG_PERROR|LOG_PID,LOG_DAEMON);
183 configuration config;
184 config.parse(config_file);
185 switch(op) {
186 case op_test:
187 cerr << "Configuration OK" << endl;
188 break;
189 case op_hup:
190 signal_self(config,SIGHUP);
191 break;
192 case op_term:
193 signal_self(config,SIGTERM);
194 break;
195 case op_check:
196 try{
197 signal_self(config,0);
198 exit(0);
199 }catch(exception& e) {
200 exit(1);
201 }
202 case op_ensure:
203 try {
204 signal_self(config,0);
205 break;
206 }catch(exception& e) {
207 syslog(LOG_NOTICE,"The dudki process is down, taking its place");
208 config.daemonize = true;
209 }catch(int zero) {
210 // we throw zero in case we're ensuring that this very process is running.
211 // we don't have to daemonize if we're daemonic.
212 config.daemonize = false;
213 }
214 case op_default:
215 case op_work:
216 {
217 if(config.daemonize) {
218 pid_t pf = fork();
219 if(pf<0)
220 throw runtime_error(string(__PRETTY_FUNCTION__)+": failed to fork()");
221 if(pf) {
222 _exit(0);
223 }
224 }
225 pid_file pidfile;
226 pidfile.set(config.pidfile);
227 signal(SIGINT,lethal_signal_handler);
228 signal(SIGABRT,lethal_signal_handler);
229 signal(SIGTERM,lethal_signal_handler);
230 signal(SIGHUP,sighup_handler);
231 while(!finishing) {
232 check_herd(config);
233 sleep(config.check_interval);
234 }
235 }
236 break;
237 default:
238 throw runtime_error(string(__PRETTY_FUNCTION__)+": internal error");
239 }
240 }catch(exception& e) {
241 cerr << "Oops: " << e.what() << endl;
242 return 1;
243 }
244}