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/*
* lbcd load module to check NTP server.
*
* Written by Larry Schwimmer
* Copyright 1997, 1998, 2008, 2012
* The Board of Trustees of the Leland Stanford Junior University
*
* See LICENSE for licensing terms.
*/
#include <config.h>
#include <portable/system.h>
#include <server/internal.h>
#include <modules/modules.h>
#include <modules/monlist.h>
#include <util/macros.h>
/*
* Probe an NTP server and determine how many peers it has, returning that
* number or -1 on an error. Takes the host and a timeout and defaults to
* probing localhost.
*/
static int
probe_ntp(const char *host, int timeout)
{
int sd;
int retval = 0;
sd = udp_connect(host ? host : "localhost", "ntp", 123);
if (sd == -1)
return -1;
else {
retval = monlist(sd, timeout);
close(sd);
}
return retval;
}
/*
* The module interface with the rest of lbcd.
*/
int
lbcd_ntp_weight(uint32_t *weight_val, uint32_t *incr_val UNUSED, int timeout,
const char *portarg UNUSED, struct lbcd_reply *lb UNUSED)
{
*weight_val = (uint32_t) probe_ntp("localhost", timeout);
return (*weight_val == (uint32_t) -1) ? -1 : 0;
}
/*
* Test routine.
*/
#ifdef MAIN
int
main(int argc, char *argv[])
{
int status;
status = probe_ntp(argv[1]);
if (status <= 0) {
printf("ntp service not available\n");
return -1;
} else {
printf("%s ntp service has %d peers\n",
argv[1] ? argv[1] : "localhost",
status);
}
return 0;
}
#endif
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