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random/ddosmonit
2023-04-27 23:01:35 -04:00

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#!/bin/sh
interface=eth0
dumpdir=/tmp/
email="admin@domain.tld"
subject="DDoS Notification: `hostname`"
sender="admin@domain.tld"
while /bin/true; do
pkt_old=`grep $interface: /proc/net/dev | cut -d : -f2 | awk '{ print $2 }'`
sleep 1
pkt_new=`grep $interface: /proc/net/dev | cut -d : -f2 | awk '{ print $2 }'`
pkt=$(( $pkt_new-$pkt_old ))
echo -ne "\r$pkt packets/s\033[0K"
if [ $pkt -gt 5000 ]; then
filename=$dumpdir/dump.`date +"%Y%m%d-%H%M%S"`.cap
tcpdump -n -s0 -c 2000 > $filename
echo "`date` Packets dumped, sleeping now."
sleep 1
data=`cat $filename`
sendmail -F $sender -it <<END_MESSAGE
To: $email
Subject: $subject
`cat $filename`
END_MESSAGE
echo "sendmail complete"
sleep 300
fi
done