nagios plugin ethtool

check_ethtool.sh

#!/usr/bin/sh
# Check if an interface is UP or DOWN and return data suitable for pnp4nagios
# Copyright © 2021 henrik lindgren <henrikprojekt at gmail.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Check if an interface is UP or DOWN and return interface data suitable for pnp4nagios
# ./check_ethtool.sh -i eth[0-3]
#
# tested on Centos7, Fedora33


function _usage ()
{
    echo "Usage : $0  [options] [--]
    Check if an interface is UP or DOWN and return interface data suitable for pnp4nagios
        ./check_ethtool.sh -i eth[0-3]

        ./check_ethtool.sh -o lo

    Options:
    -h|help       Display this message
    -w            warning, TODO:
    -c            critical, TODO:
    -M            max, TODO:
    -m            min, TODO:
    -i            comma delimited list of interface names can be regex to check eth0,vif[0-1] defaults to all
    -o            comma delimited list of interface names can be regex to omit lo,fbi0,mp0
    "

}    # ----------  end of function usage  ----------

#-----------------------------------------------------------------------
#  Handle command line arguments
#-----------------------------------------------------------------------

while getopts ":hc:w:m:M:i:o:" opt
do
  case $opt in

    h|help)     _usage; exit 0   ;;
    w|warning)  warning="$OPTARG";;
    c|critical) critical="$OPTARG";;
    m|min)      min="$OPTARG";;
    M|max)      max="$OPTARG";;
    i|ifaces)   ifaces="${OPTARG}";;
    o|ofaces)   ofaces="${OPTARG}";;

    * )  echo -e "\n  Option does not exist : $OPTARG\n"
    _usage; exit 4   ;;

  esac    # --- end of case ---
done
shift $((OPTIND-1))


if command -v ip &> /dev/null ; then
   allfaces="$(ip a | awk -vFS=': ' '/^[0-9]/{printf "%s ",$2}')"
elif command -v ifconfig &> /dev/null ; then
   allfaces="$(ifconfig | awk -vFS=':' '/^\w/{printf "%s ",$1}')"
else
   echo "UNKNOWN - no interface specified on cmdline and no ifconfig or ip command found"
   exit 3
fi

if [ ! x${ifaces} = "x" ] ; then
    rfaces="$(echo ${ifaces[@]} | sed 's/,/\\|/g; s/ /\\|/g')"
    ifaces="$(echo $allfaces | grep -o "$rfaces")"
    #echo "debug include regex: $rfaces"
    #echo "debug include ifaces: $ifaces"
else
    ifaces="$allfaces"
fi

# handle excluded interfaces
if [ ! x${ofaces} = "x" ] ; then
    rfaces="$(echo ${ofaces[@]} | sed 's/,/\\|/g; s/ /\\|/g')"
    ifaces="$(echo $ifaces | sed "s/$rfaces//g")"
    #echo "debug regex: $rfaces"
    #echo "debug ifaces: $ifaces"
fi

lastrun=""
ifstatus=""
OK="OK"

for iface in ${ifaces[@]}; do
# ethtool formats output like this:
# NIC statistics:
#      tx_packets: 238710
#      rx_errors: 0
# awk will format output like:
#    eth0_rx_octets=571706c
        lastrun="$(echo -e $lastrun; ethtool -S $iface 2>/dev/null |\
                awk -v"iface=$iface" '
                /^\s+\w+:/{
                   gsub(/:\s/,"=",$0);
                   printf "%s_%s%sc ",iface,$1,$2}')"

        if ethtool $iface | tail -1 | grep yes &> /dev/null ; then
                ifstatus="$ifstatus $iface=UP"
        else
                ifstatus="$ifstatus $iface=DOWN"
                OK='CRITICAL'
        fi
done

echo "$OK - Link$ifstatus | $lastrun"

if [ "x$OK" = 'xOK' ] ; then
        exit 0;
elif [ "x$OK" = 'xWARNING' ] ; then
        exit 1;
elif [ "x$OK" = 'xCRITICAL' ]; then
        exit 2;
elif [ "x$OK" = 'xUNKNOWN' -o "x$OK" == 'x' ] ; then
        exit 3;
fi