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#!/bin/sh
# Send real-time bandwidth data to Splunk HTTP Event Collector
# Bandwidth calculations based on script by WaLLy3K (see https://www.linksysinfo.org/index.php?threads/how-to-monitor-the-ip-traffic-and-bandwidth-with-cli.71998/)
# For running on Tomato USB or Advanced Tomato routers
# /proc/net/dev has raw bandwidth stats for network interfaces
# Columns
wan_iface=`nvram get wan_iface`
calc(){ awk "BEGIN { print $*}"; } # Calculate floating point arithmetic using AWK instead of BC
checkWAN () {
[ -z $1 ] && sec="1" || sec="$1"
netdev=`grep "$wan_iface" /proc/net/dev`
pRX=$(echo $netdev | cut -d' ' -f2)
pTX=$(echo $netdev | cut -d' ' -f10)
sleep $sec
netdev=`grep "$wan_iface" /proc/net/dev`
cRX=$(echo $netdev | cut -d' ' -f2)
cTX=$(echo $netdev | cut -d' ' -f10)
[ $cRX \< $pRX ] && getRX=`calc "$cRX + (0xFFFFFFFF - $pRX)"` || getRX=`calc "($cRX - $pRX)"`
[ $cTX \< $pTX ] && getTX=`calc "$cTX + (0xFFFFFFFF - $pTX)"` || getTX=`calc "($cTX - $pTX)"`
dlBytes=$(($getRX/$sec)); ulBytes=$(($getTX/$sec))
[ $dlBytes -le "12000" -a $ulBytes -le "4000" ] && wanStatus="idle" || wanStatus="busy"
getDLKbit=$(printf "%.0f\n" `calc $dlBytes*0.008`); getULKbit=$(printf "%.0f\n" `calc $ulBytes*0.008`)
getDLMbit=$(printf "%.2f\n" `calc $dlBytes*0.000008`); getULMbit=$(printf "%.2f\n" `calc $ulBytes*0.000008`)
}
seconds=$1
if [ -z $seconds ]
then
seconds=5
fi
if [ -z $SPLUNK_AUTH ]
then
echo "SPLUNK_AUTH environment must be set"
exit 1
fi
splunkUrl="http://fantom:8088/services/collector/event"
while :
do
checkWAN 5
curl -s -o /dev/null $splunkUrl -H "Authorization: Splunk $SPLUNK_AUTH" -d "{\"event\": \"code=bandwidth dl=$getDLMbit ul=$getULMbit\"}"
done