projects/smsdaemon/daemon.cpp

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

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