#! /bin/bash
#
# Checks to see if data has been updated recently.
#
# Copyright 2005 Robert Helmer
# Author: Robert Helmer <robert@roberthelmer.com>

PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin

PROGNAME=`basename $0`
PROGPATH=`echo $0 | sed -e 's,[\\/][^\\/][^\\/]*$,,'`
NAGIOS_PLUGIN_PATH='/usr/lib/nagios/plugins'
REVISION=`echo '$Revision 1.2 $' | sed -e 's/[^0-9.]//g'`
# current date in unix time
DATE=`perl -e 'print time'`

. $NAGIOS_PLUGIN_PATH/utils.sh

while getopts "f:a:" options
do 
	case "$options" in
		f) 
			# data to check
			DATAFILE=$OPTARG
			if test -f $DATAFILE
			then
				echo -n
			else
				echo "CRITICAL: `basename $DATAFILE` does not exist!"
				exit 127
			fi
		;;
		a) 
			# allowed age of file, in seconds
			ALLOWED_AGE=$OPTARG
		;;
	esac
done

print_usage() {
	echo "Usage: $PROGNAME -a <age> -f <filename_to_check>"
}

print_help() {
	print_revision $PROGNAME $REVISION
	echo ""
	print_usage
	echo ""
	echo "This plugin checks file modification time to see if we're getting"
        echo "new data consistently."
	echo ""
	support
	exit 0
}

case "$1" in
	--help)
		print_help
		exit 0
		;;
	-h)
		print_help
		exit 0
		;;
	--version)
   	print_revision $PROGNAME $REVISION
		exit 0
		;;
	-V)
		print_revision $PROGNAME $REVISION
		exit 0
		;;
	*)
		if test -z $DATAFILE
		then
  			print_usage
  			exit 1
			fi

		if test -z $ALLOWED_AGE
		then
  			print_usage
			exit 1
		fi

                # mtime of file in unix time
                MTIME=`perl -e '$c=(stat "'$DATAFILE'")[10] ; print "$c"'`
		DIFF=`expr $DATE - $MTIME`
                TIMER=`expr $ALLOWED_AGE - $DIFF`
                if test $TIMER -gt 0
		then
			ALLOWED_AGE=`expr $ALLOWED_AGE / 3600`
			DIFF=`expr $DIFF / 3600`
			echo "OK: `basename $DATAFILE` is $DIFF hours old (threshold = $ALLOWED_AGE hours)"
			exit 0
		else
			ALLOWED_AGE=`expr $ALLOWED_AGE / 3600`
			DIFF=`expr $DIFF / 3600`
			echo "CRITICAL: `basename $DATAFILE` is $DIFF hours old (threshold = $ALLOWED_AGE hours)"
			exit 2
		fi
		;;
esac