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/*****************************************************************************
*
* ntpsnmpd.c
*
* The NTP SNMP daemon is an Agent X subagent application that
* registers itself with a running SNMP Agent X master process running
* on the same machine on port TCP 705. It utilizes the libntqp library
* which accesses status and general data of a running ntpd process on
* the same machine and enables the user to monitor the status of a
* ntp daemon process via SNMP.
*
* This started as a Google Summer of Code 2008 project,
* including the ntpsnmpd sub agent and the libntpq library.
*
* For more information please visit
* http://support.ntp.org/bin/view/Dev/GSoC2008snmp
* Or contact:
* Harlan Stenn (Mentor) at stenn@ntp.org
* Heiko Gerstung (Student) at gerstung@ntp.org
*
****************************************************************************/
#include <ntp_snmp.h>
#include <signal.h>
#include <sys/time.h>
#ifdef SOLARIS /* needed with at least Solaris 8 */
#include <siginfo.h>
#endif
#include <libntpq.h>
#include <ntpsnmpd-opts.h>
static int keep_running;
RETSIGTYPE stop_server(int);
RETSIGTYPE
stop_server(int a) {
keep_running = 0;
}
/* The main function just sets up a few things and then enters a loop in which it will
* wait for SNMP requests coming from the master agent
*/
int
main (int argc, char **argv) {
int background = 0; /* start as background process */
int use_syslog = 1; /* use syslog for logging */
{
int optct = optionProcess(&ntpsnmpdOptions, argc, argv);
argc -= optct;
argv += optct;
}
if (!HAVE_OPT(NOFORK))
background = 1;
if (!HAVE_OPT(SYSLOG))
use_syslog = 0;
/* using the net-snmp syslog facility */
if (use_syslog)
snmp_enable_calllog();
else
snmp_enable_stderrlog();
/* Become Subagent */
netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_ROLE, 1);
/* go into background mode, if requested */
if (background && netsnmp_daemonize(1, !use_syslog))
exit(1);
/* Now register with the master Agent X process */
/* call Netsnmp socket startup macro, which will initialize the network stuff if required */
SOCK_STARTUP;
/* Set AgentX socket interface */
netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_X_SOCKET, OPT_ARG( AGENTXSOCKET ));
init_agent("ntpsnmpd");
/* Try to connect to ntpd */
if ( ntpq_openhost("localhost", 0) == 0 )
{
fprintf(stderr, "Error: Could not connect to ntpd. Aborting.\n");
exit(1);
}
/* Register callback functions ... */
init_ntpSnmpSubagentObject();
init_snmp("ntpsnmpd");
/* Signal handler */
keep_running = 1;
signal(SIGTERM, stop_server);
signal(SIGINT, stop_server);
snmp_log(LOG_INFO,"ntpsnmpd started.\n");
/* main loop here... */
while(keep_running) {
agent_check_and_process(1); /* 0 == don't block */
}
/* at shutdown time */
ntpq_closehost();
snmp_shutdown("ntpsnmpd");
SOCK_CLEANUP;
return 0;
}
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