#! /bin/bash

set -eu -o pipefail

function _usage {
   echo "Usage: $O -H addresse -C public -w W% -c X%"
   exit 3
}
black=SNMPv2-SMI::mib-2.43.11.1.1.9.1.1
blue=SNMPv2-SMI::mib-2.43.11.1.1.9.1.2
magenta=SNMPv2-SMI::mib-2.43.11.1.1.9.1.3
yellow=SNMPv2-SMI::mib-2.43.11.1.1.9.1.4

if [ $# -lt 1 ] ; then _usage ; fi

while getopts "hH:w:c:C:i:" opt ; do
   case $opt in
   (i)
      color=$OPTARG
      ;;
   (C)
      community=$OPTARG
      ;;
   (H)
      host=$OPTARG
      ;;
  (h)
      _usage
      ;;
   (w)
      warning=$OPTARG
      ;;
   (c)
      critical=$OPTARG
      ;;
   (*)
      _usage
      ;;
   esac
done

test -x /usr/bin/snmpwalk || exit 3

v=$(snmpwalk -v2c -c "${community}"  "${host}" ${!color} -Oq | awk '{print $2}')

if [ "$v" -lt "$critical" ] ; then
   echo "$color critical level"
   exit 2
fi

if [ "$v" -lt "$warning" ] ; then
   echo "$color warning level"
   exit 1
fi

echo "$color ok level"
exit 0