NagiosScripts/check_linux_net_usage at master · tim-koehler/NagiosScripts · GitHub

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#!/bin/bash

Syntax()
{
   echo " "
   echo "  Command Syntax: check_linux_net_usage [-H host] [-c val] [-w val]"
   echo " "
   exit 3;
}

if [[ $# -ne 6 ]]
then
  Syntax
fi

valw=0
valc=0
host=""

while [[ $# > 0 ]]
do
   par=$1
   case $par in
     -c) shift
         valc=$1;;
     -w) shift
         valw=$1;;
     -H) shift
         host=$1;;
     -h) shift
         Syntax
         exit;;
      *) shift;;
   esac
done

bashSnippet='
             rxBytes1=0;\
             for bytes in `cat /sys/class/net/*/statistics/rx_bytes`; do\
             rxBytes1=$((rxBytes1 + bytes));\
             done;\
             txBytes1=0;\
             for bytes in `cat /sys/class/net/*/statistics/tx_bytes`; do\
             txBytes1=$((txBytes1 + bytes));\
             done;\
             sleep 5s;\
             rxBytes2=0;\
             for bytes in `cat /sys/class/net/*/statistics/rx_bytes`; do\
             rxBytes2=$((rxBytes2 + bytes));\
             done;\
             txBytes2=0;\
             for bytes in `cat /sys/class/net/*/statistics/tx_bytes`; do\
             txBytes2=$((txBytes2 + bytes));\
             done;\
             rxPerSecond=$(( (rxBytes2 - rxBytes1) / 5 ));\
             txPerSecond=$(( (txBytes2 - txBytes1) / 5 ));\
             echo "$rxPerSecond $txPerSecond";'

rxAndtxOutput=$(ssh nagios@$host "$bashSnippet")
if [[ -z $rxAndtxOutput ]]; then
	echo "SSH Error | ExitCode=3"
	exit 3
fi

rxInBytes=$(echo "$rxAndtxOutput" | awk '{ print $1 }')
rxInKiloBits=$(echo "(($rxInBytes * 8 ) / 1024)" | bc -l )
rxInMegaBits=$(echo "(($rxInKiloBits) / 1024)" | bc -l | awk '{printf "%.2f", $0}')

txInBytes=$(echo "$rxAndtxOutput" | awk '{ print $2 }')
txInKiloBits=$(echo "(($txInBytes * 8 ) / 1024)" | bc -l )
txInMegaBits=$(echo "(($txInKiloBits) / 1024)" | bc -l | awk '{printf "%.2f", $0}')

exitCode=0
status="OK"

#if (( $(echo "$rxInMegaBits > $valw" | bc -l) )) || (( $(echo "$txInMegaBits > $valw" | bc -l) ))
if [ $(echo "$rxInMegaBits > $valw" | bc) -eq 1  ] || [ $(echo "$txInMegaBits > $valw" | bc) -eq 1 ]; then
	exitCode=1
	status="WARNING"
fi

#if (( $(echo "$rxInMegaBits > $valc" | bc -l) )) || (( $(echo "$txInMegaBits > $valc" | bc -l) ))
if [ $(echo "$rxInMegaBits > $valc" | bc -l) -eq 1 ] || [ $(echo "$txInMegaBits > $valc" | bc -l) -eq 1 ]; then
	exitCode=2
	status="CRITICAL"
fi

echo "NetUsage $status :: RX = $rxInMegaBits Mbits/s / TX = $txInMegaBits Mbits/s | RX=$rxInMegaBits;TX=$txInMegaBits;$valw;$valc"
exit $exitCode