projects/smsdaemon/daemon.cpp

#include <iostream>
#include <sstream>
#include <signal.h>
#include <fcntl.h>
#include <stdlib.h>
#include <cstring>
#include <cstdio>

#include <sys/types.h>
#include <pwd.h>
#include <grp.h>


#include "ConfigFile.h"
#include "daemon.h"
#include "Common.h"
#include "Logger.h"


using namespace std;


void signal_handler(int sig)
{
        switch (sig)
        {
        case SIGHUP:
                Logger::logMessage("Reload config");
                Common::instance()->reloadConfig = true;

                break;

        case SIGTERM:
                Logger::logMessage("terminate signal catched...exiting");
                Common::instance()->mainContinue = false;
                break;
        default:
                std::stringstream ss;
                ss << "Received unknown signal: " << sig;
                Logger::logMessage(ss.str());
                break;
        }
}

void lookup_uid_values()
{
        Common* cmn = Common::instance();

        std::string userstr = cmn->GetConfigfile()->GetValue("smsdaemon","user","");
        std::string groupstr = cmn->GetConfigfile()->GetValue("smsdaemon","group","");

        passwd* pass = getpwnam(userstr.c_str());
        if (pass != 0)
        {
                cmn->uid = pass->pw_uid;
        }
        else
        {
                Logger::logMessage( string("could not lookup userid: ") + userstr );
                exit(1);
        }


        group* grp = getgrnam(groupstr.c_str() );
        if (grp != 0)
        {
                cmn->gid = grp->gr_gid;
        }
        else
        {
                Logger::logMessage( string("could not lookup groupid: ") + groupstr );
                exit(1);
        }
}


void daemonCleanup()
{
        Common* cmn = Common::instance();
        Logger::logMessage("Cleaning up daemon");

        seteuid(0);
        setegid(0);
        unlink( cmn->pidfile.c_str() );

}

void daemonize()
{
        int i, lfp;
        char str[10];
        Common* cmn = Common::instance();

        if (getuid() != 0)
        {
                cout << "Please start this daemon as root\n" << endl;
                daemon_shutdown(0);
        }


        if (getppid() == 1) /* already a daemon */
                return;

        i=fork();

        if (i<0) /* fork error */
                daemon_shutdown(FORK_ERROR);
        if (i>0) /* parent exits */
                daemon_shutdown(0);
        /* child daemon continues */

        setsid(); /* obtain a new process group */

        for (i=getdtablesize(); i>=0; --i)
                close(i); /*close all descriptors*/

        i=open("/dev/null", O_RDWR); /* handle std. io */
        dup(i);
        dup(i);

        umask(027); /* set newly created file permissions */

        chdir("/tmp"); /* change running directory*/

        /*attempt to create lockfile and put a file-lock on it*/
        lfp=open(cmn->pidfile.c_str(), O_RDWR|O_CREAT, 0640);
        if (lfp<0) /* can not open */
                daemon_shutdown(CANT_OPEN_LOCK);
        if (lockf(lfp,F_TLOCK,0) < 0) /* can not lock */
                daemon_shutdown(ALREADY_LOCKED);

        /* first instance continues */
        sprintf(str, "%d\n", getpid() ); /* record pid to lockfile */
        write(lfp, str, strlen(str) );
        //signal(SIGCHLD, SIG_IGN); /* ignore child */
        signal(SIGTSTP, SIG_IGN); /* ignore tty signals */
        signal(SIGTTOU, SIG_IGN);
        signal(SIGTTIN, SIG_IGN);
        signal(SIGHUP, signal_handler); /* catch hangup signal */
        signal(SIGTERM, signal_handler); /* catch kill signal */
        signal(SIGINT, signal_handler); /* keyboard interrupt */
        signal(SIGQUIT, signal_handler); /* QUIT */

        /*this program is now a daemon*/
        setegid( cmn->gid );
        seteuid( cmn->uid );
}
1	torben	26	#include <iostream>
2	torben	153	#include <sstream>
3	torben	26	#include <signal.h>
4			#include <fcntl.h>
5	torben	114	#include <stdlib.h>
6			#include <cstring>
7	torben	325	#include <cstdio>
8	torben	26
9	torben	146	#include <sys/types.h>
10			#include <pwd.h>
11			#include <grp.h>
12
13
14	torben	152	#include "ConfigFile.h"
15	torben	26	#include "daemon.h"
16	torben	158	#include "Common.h"
17	torben	157	#include "Logger.h"
18	torben	26
19
20
21			using namespace std;
22
23	torben	146
24	torben	26	void signal_handler(int sig)
25			{
26	torben	146	switch (sig)
27			{
28			case SIGHUP:
29	torben	208	Logger::logMessage("Reload config");
30			Common::instance()->reloadConfig = true;
31
32	torben	146	break;
33	torben	26
34	torben	146	case SIGTERM:
35	torben	157	Logger::logMessage("terminate signal catched...exiting");
36	torben	146	Common::instance()->mainContinue = false;
37			break;
38	torben	153	default:
39			std::stringstream ss;
40			ss << "Received unknown signal: " << sig;
41	torben	157	Logger::logMessage(ss.str());
42	torben	153	break;
43	torben	26	}
44			}
45
46	torben	146	void lookup_uid_values()
47			{
48			Common* cmn = Common::instance();
49
50	torben	214	std::string userstr = cmn->GetConfigfile()->GetValue("smsdaemon","user","");
51			std::string groupstr = cmn->GetConfigfile()->GetValue("smsdaemon","group","");
52	torben	152
53			passwd* pass = getpwnam(userstr.c_str());
54	torben	146	if (pass != 0)
55			{
56			cmn->uid = pass->pw_uid;
57			}
58			else
59			{
60	torben	157	Logger::logMessage( string("could not lookup userid: ") + userstr );
61	torben	146	exit(1);
62			}
63
64	torben	155
65	torben	152	group* grp = getgrnam(groupstr.c_str() );
66	torben	146	if (grp != 0)
67			{
68			cmn->gid = grp->gr_gid;
69			}
70			else
71			{
72	torben	157	Logger::logMessage( string("could not lookup groupid: ") + groupstr );
73	torben	146	exit(1);
74			}
75			}
76
77
78	torben	26	void daemonCleanup()
79			{
80	torben	190	Common* cmn = Common::instance();
81			Logger::logMessage("Cleaning up daemon");
82	torben	196
83	torben	190	seteuid(0);
84			setegid(0);
85			unlink( cmn->pidfile.c_str() );
86
87	torben	26	}
88
89			void daemonize()
90	torben	146	{
91	torben	26	int i, lfp;
92			char str[10];
93			Common* cmn = Common::instance();
94
95			if (getuid() != 0)
96			{
97			cout << "Please start this daemon as root\n" << endl;
98			daemon_shutdown(0);
99			}
100
101	torben	146
102	torben	26	if (getppid() == 1) /* already a daemon */
103			return;
104	torben	146
105	torben	26	i=fork();
106	torben	146
107	torben	26	if (i<0) /* fork error */
108			daemon_shutdown(FORK_ERROR);
109			if (i>0) /* parent exits */
110			daemon_shutdown(0);
111			/* child daemon continues */
112	torben	146
113	torben	26	setsid(); /* obtain a new process group */
114	torben	146
115	torben	26	for (i=getdtablesize(); i>=0; --i)
116			close(i); /close all descriptors/
117	torben	146
118	torben	26	i=open("/dev/null", O_RDWR); /* handle std. io */
119			dup(i);
120	torben	146	dup(i);
121
122	torben	26	umask(027); /* set newly created file permissions */
123	torben	146
124	torben	26	chdir("/tmp"); /* change running directory*/
125	torben	146
126	torben	26	/attempt to create lockfile and put a file-lock on it/
127			lfp=open(cmn->pidfile.c_str(), O_RDWR\|O_CREAT, 0640);
128			if (lfp<0) /* can not open */
129			daemon_shutdown(CANT_OPEN_LOCK);
130			if (lockf(lfp,F_TLOCK,0) < 0) /* can not lock */
131			daemon_shutdown(ALREADY_LOCKED);
132	torben	146
133	torben	26	/* first instance continues */
134			sprintf(str, "%d\n", getpid() ); /* record pid to lockfile */
135			write(lfp, str, strlen(str) );
136	torben	86	//signal(SIGCHLD, SIG_IGN); /* ignore child */
137	torben	26	signal(SIGTSTP, SIG_IGN); /* ignore tty signals */
138			signal(SIGTTOU, SIG_IGN);
139			signal(SIGTTIN, SIG_IGN);
140			signal(SIGHUP, signal_handler); /* catch hangup signal */
141	torben	146	signal(SIGTERM, signal_handler); /* catch kill signal */
142	torben	155	signal(SIGINT, signal_handler); /* keyboard interrupt */
143			signal(SIGQUIT, signal_handler); /* QUIT */
144	torben	26
145			/this program is now a daemon/
146			setegid( cmn->gid );
147			seteuid( cmn->uid );
148			}