#!/bin/bash

IOSTAT=/usr/bin/iostat

# Nagios return codes
STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3

# Plugin parameters value if not define
WARNING_THRESHOLD=${WARNING_THRESHOLD:="30"}
CRITICAL_THRESHOLD=${CRITICAL_THRESHOLD:="30"}
INTERVAL_SEC=${INTERVAL_SEC:="5"}
NUM_REPORT=${NUM_REPORT:="2"}

# Plugin variable description
PROGNAME=$(basename $0)
RELEASE="Revision 2.1.1"
AUTHOR="(c) 2008 Steve Bosek (steve.bosek@gmail.com)"

if [ ! -x $IOSTAT ]; then
        echo "UNKNOWN: iostat not found or is not executable by the nagios user."
        exit $STATE_UNKNOWN
fi

# Functions plugin usage
print_release() {
    echo "$RELEASE $AUTHOR"
}

print_usage() {
        echo ""
        echo "$PROGNAME $RELEASE - CPU Utilization check script for Nagios"
        echo ""
        echo "Usage: check_cpu_stats.sh -w -c (-i -n)"
        echo ""
        echo "  -w  Warning level in % for cpu iowait"
        echo "  -c  Crical level in % for cpu iowait"
        echo "  -i  Interval in seconds for iostat (default : 1)"
        echo "  -n  Number report for iostat (default : 3)"
        echo "  -h  Show this page"
        echo ""
    echo "Usage: $PROGNAME"
    echo "Usage: $PROGNAME --help"
    echo ""
}

print_help() {
        print_usage
        echo ""
        echo "This plugin will check cpu utilization (user,system,iowait,idle in %)"
        echo ""
        exit 0
}

# Parse parameters
while [ $# -gt 0 ]; do
    case "$1" in
        -h | --help)
            print_help
            exit $STATE_OK
            ;;
        -v | --version)
                print_release
                exit $STATE_OK
                ;;
        -w | --warning)
                shift
                WARNING_THRESHOLD=$1
                ;;
        -c | --critical)
               shift
                CRITICAL_THRESHOLD=$1
                ;;
        -i | --interval)
               shift
               INTERVAL_SEC=$1
                ;;
        -n | --number)
               shift
               NUM_REPORT=$1
                ;;
        *)  echo "Unknown argument: $1"
            print_usage
            exit $STATE_UNKNOWN
            ;;
        esac
shift
done

# CPU Utilization Statistics Unix Plateform ( Linux,AIX,Solaris are supported )
case `uname` in
        Linux ) CPU_REPORT=`iostat -c $INTERVAL_SEC $NUM_REPORT | sed -e 's/,/./g' | tr -s ' ' ';' | sed '/^$/d' | tail -1`
                        CPU_REPORT_SECTIONS=`echo ${CPU_REPORT} | grep ';' -o | wc -l`
                        CPU_USER=`echo $CPU_REPORT | cut -d ";" -f 2`
                        CPU_NICE=`echo $CPU_REPORT | cut -d ";" -f 3`
                        CPU_SYSTEM=`echo $CPU_REPORT | cut -d ";" -f 4`
                        CPU_IOWAIT=`echo $CPU_REPORT | cut -d ";" -f 5`
                        CPU_IOWAIT_MAJOR=`echo $CPU_IOWAIT | cut -d "." -f 1`
                if [ ${CPU_REPORT_SECTIONS} -ge 6 ]; then
                        CPU_STEAL=`echo $CPU_REPORT | cut -d ";" -f 6`
                        CPU_IDLE=`echo $CPU_REPORT | cut -d ";" -f 7`
                        CPU_IDLE_MAJOR=`echo $CPU_IDLE | cut -d "." -f 1`
                        NAGIOS_DATA="user=${CPU_USER}% system=${CPU_SYSTEM}% iowait=${CPU_IOWAIT}% idle=${CPU_IDLE}% nice=${CPU_NICE}% steal=${CPU_STEAL}% | CpuUser=${CPU_USER};CpuSystem=${CPU_SYSTEM};CpuIoWait=${CPU_IOWAIT};CpuIdle=${CPU_IDLE};CpuNice=${CPU_NICE};CpuSteal=${CPU_STEAL};$WARNING_THRESHOLD;$CRITICAL_THRESHOLD"
                else
                        CPU_IDLE=`echo $CPU_REPORT | cut -d ";" -f 6`
                        NAGIOS_DATA="user=${CPU_USER}% system=${CPU_SYSTEM}% iowait=${CPU_IOWAIT}% idle=${CPU_IDLE}% nice=${CPU_NICE}% | CpuUser=${CPU_USER};CpuSystem=${CPU_SYSTEM};CpuIoWait=${CPU_IOWAIT};CpuIdle=${CPU_IDLE};CpuNice=${CPU_NICE};$WARNING_THRESHOLD;$CRITICAL_THRESHOLD"
                fi
            ;;
        AIX ) CPU_REPORT=`iostat -t $INTERVAL_SEC $NUM_REPORT | sed -e 's/,/./g'|tr -s ' ' ';' | tail -1`
                        CPU_USER=`echo $CPU_REPORT | cut -d ";" -f 4`
                        CPU_SYSTEM=`echo $CPU_REPORT | cut -d ";" -f 5`
                        CPU_IOWAIT=`echo $CPU_REPORT | cut -d ";" -f 7`
                        CPU_IOWAIT_MAJOR=`echo $CPU_IOWAIT | cut -d "." -f 1`
                        CPU_IDLE=`echo $CPU_REPORT | cut -d ";" -f 6`
                        NAGIOS_DATA="user=${CPU_USER}% system=${CPU_SYSTEM}% iowait=${CPU_IOWAIT}% idle=${CPU_IDLE}% | CpuUser=${CPU_USER};CpuSystem=${CPU_SYSTEM};CpuIoWait=${CPU_IOWAIT};CpuIdle=${CPU_IDLE};$WARNING_THRESHOLD;$CRITICAL_THRESHOLD"
            ;;
        SunOS ) CPU_REPORT=`iostat -c $INTERVAL_SEC $NUM_REPORT | tail -1`
                        CPU_USER=`echo $CPU_REPORT | awk '{ print $1 }'`
                        CPU_SYSTEM=`echo $CPU_REPORT | awk '{ print $2 }'`
                        CPU_IOWAIT=`echo $CPU_REPORT | awk '{ print $3 }'`
                        CPU_IOWAIT_MAJOR=`echo $CPU_IOWAIT | cut -d "." -f 1`
                        CPU_IDLE=`echo $CPU_REPORT | awk '{ print $4 }'`
                        NAGIOS_DATA="user=${CPU_USER}% system=${CPU_SYSTEM}% iowait=${CPU_IOWAIT}% idle=${CPU_IDLE}% | CpuUser=${CPU_USER};CpuSystem=${CPU_SYSTEM};CpuIoWait=${CPU_IOWAIT};CpuIdle=${CPU_IDLE};$WARNING_THRESHOLD;$CRITICAL_THRESHOLD"
            ;;
        *)              echo "UNKNOWN: `uname` not yet supported by this plugin. Coming soon !"
                        exit $STATE_UNKNOWN
            ;;
        esac

# Return
        if [ ${CPU_IDLE_MAJOR} -le $CRITICAL_THRESHOLD ]; then
                echo "CPU STATISTICS CRITICAL : ${NAGIOS_DATA}"
                exit $STATE_CRITICAL
        else
                echo "CPU STATISTICS OK : ${NAGIOS_DATA}"
                exit $STATE_OK
        fi