#!/bin/sh
TMP=`mktemp`
LAST_HOUR=`date "+%b %e %H:" -d "1 hour ago"`
CURRENT_HOUR=`date "+%b %e %H:"`

tail -n 2000 /var/log/messages | \
grep -E "$CURRENT_HOUR|$LAST_HOUR" | \
grep "Passive check result was received" | \
grep -i "could not be found"  | \
sed 's/.*Passive check result was received for service //' | \
sed 's/, but the host could not be found.*//' | \
sort | uniq > $TMP


LINES=`cat $TMP | wc -l`
PERFDATA="'ghost_clients'=$LINES"
if [ $LINES -gt 0 ]; then
	echo "$LINES ghost clients found in Nagios log files | $PERFDATA" 
	echo ""
	cat $TMP
	rm -f $TMP
	exit 1
fi

echo "No ghost clients found in Nagios log files | $PERFDATA"
rm -f $TMP
exit 0