Someone

#!/bin/bash

BANNED_IP_LIST="/usr/local/ddos/banned.ip.list"
REPORTED_IP_LIST="/usr/local/ddos/reported.ip.list"
SERVER=`ifconfig eth0 | awk '/inet addr/ {split ($2,A,":"); print A[2]}'`

for i in `cat $BANNED_IP_LIST | sort | uniq`; do
  if grep -Fxq $i $REPORTED_IP_LIST
  then
    echo > /dev/null
  else
    echo "Reporting: $i"
    regex="^[a-z0-9!#\$%&'*+/=?^_\`{|}~-]+(\.[a-z0-9!#$%&'*+/=?^_\`{|}~-]+)*@([a-z0-9]([a-z0-9-]*[a-z0-9])?\.)+[a-z0-9]([a-z0-9-]*[a-z0-9])?\$"
    EMAIL=`whois $i  | grep 'abuse@' | head -n 1 | grep -Eiorh '([[:alnum:]_.]+@[[:alnum:]_]+?\.[[:alpha:].]{2,6})'`
    if [[ $EMAIL =~ $regex ]] ;
    then
      VALIDEMAIL=$EMAIL
    else
      EMAIL=`whois $i  | grep 'e-mail' | head -n 1 | grep -Eiorh '([[:alnum:]_.]+@[[:alnum:]_]+?\.[[:alpha:].]{2,6})'`
      if [[ $EMAIL =~ $regex ]] ;
      then
        VALIDEMAIL=$EMAIL
      fi
    fi

    if [[ $VALIDEMAIL =~ $regex ]] ;
    then
      echo "$VALIDEMAIL"
      echo -e "Hello, \n\nWe have detected a DDoS attack on one of our servers ($SERVER) coming from the IP address $i.\nPlease investigate and take appropriate measures.\n\nCryptoVPN.com Abuse Team" | mail -s "DDoS Abuse: $i" $VALIDEMAIL
    fi
    echo $i >> $REPORTED_IP_LIST
    sleep 1
  fi
done