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#!/bin/bash
# ============================== SUMMARY =====================================
#Author : Ken Roulamellah
#Date : 19/07/2018
#Version : 1.0
# Licence : GPL
# ===================== INFORMATION ABOUT THIS PLUGIN ========================
#
# This plugin checks the average RX and TX bandwidth utilisation. It use
# kbytes as measure unite.
#
# ========================== START OF PROGRAM CODE ===========================
STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3
interface=$( ip route | grep default | awk '{print $5}' | head -n1)
function print_usage()
{
echo "Usage :"
echo "$0 [ -i=INTERFACE] [ -ct=COUNT ] -w WARNING -c CRITICAL"
echo "This script calculate the average bandwith usage."
echo "Default values | interface: ${interface}, counter: 10"
}
counter=10
warning=-1
critical=-1
sum_rx=0
sum_tx=0
avg_rx=
avg_tx=
i=
if [[ $# -lt 4 ]];
then
echo "Error: Arguments are missing"
print_usage
exit $STATE_UNKNOWN
fi
while [[ $# -gt 0 ]]; do
case "$1" in
-i=*)
interface="$(cut -d'=' -f2 <<<"$1")"
shift
;;
-ct=*)
counter="$(cut -d'=' -f2 <<<"$1")"
shift
;;
-w)
warning=$2
shift 2
;;
-c)
critical=$2
shift 2
;;
*)
printf "\nError: Invalid option '$1'"
print_usage
exit $STATE_UNKNOWN
;;
esac
done
if [ $warning -lt 0 ] || [ $critical -lt 0 ];
then
echo "Error: You need to specify a warning and critical treshold"
print_usage
exit $STATE_UNKNOWN
fi
grep -q "up" /sys/class/net/$interface/operstate || exec echo "$interface: no such device or down"
read rx <"/sys/class/net/$interface/statistics/rx_bytes"
read tx <"/sys/class/net/$interface/statistics/tx_bytes"
i=$counter
while [ $i -gt 0 ]; do
sleep 1
read newrx <"/sys/class/net/$interface/statistics/rx_bytes"
read newtx <"/sys/class/net/$interface/statistics/tx_bytes"
#echo "old rx :$rx"
#echo "new rx :$newrx"
rx_cal=$(bc <<< "scale=2; ($newrx-$rx) / 1000")
tx_cal=$(bc <<< "scale=2; ($newtx-$tx) / 1000")
sum_rx=$(bc <<< "scale=2;$sum_rx+$rx_cal")
sum_tx=$(bc <<< "scale=2;$sum_tx+$tx_cal")
#echo "$interface {rx: $rx_cal ko/s, tx: $tx_cal ko/s}"
rx=$newrx
tx=$newtx
((i --))
done
avg_rx=$(bc <<< "scale=2;$sum_rx/$counter")
avg_tx=$(bc <<< "scale=2;$sum_tx/$counter")
#echo "$avg_rx"
#echo "$avg_tx"
if [ $(bc <<< "$avg_rx > $critical || $avg_tx > $critical") -eq 1 ]; then
echo "$interface CRITICAL - AVG_RX: $avg_rx kb/s, AVG_TX:
$avg_tx kb/s | RX="$avg_rx"kbps;0;0;0; TX="$avg_tx"kbps;0;0;0;"
exit $STATE_CRITICAL
elif [ $(bc <<< "$avg_rx > $warning || $avg_tx > $warning") -eq 1 ]; then
echo "$interface WARNING - AVG_RX: $avg_rx kb/s, AVG_TX: $avg_tx kb/s | RX="$avg_rx"kbps;0;0;0; TX="$avg_tx"kbps;0;0;0;"
exit $STATE_WARNING
else
echo "$interface - OK AVG_RX: $avg_rx kb/s, AVG_TX: $avg_tx kb/s | RX="$avg_rx"kbps;0;0;0; TX="$avg_tx"kbps;0;0;0;"
exit $STATE_OK
fi
exit 3
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