#!/bin/bash

# At the ASG, create a DNAT for UDP Traffic Port 9 to $DNATDST

# Configuration
MAC=00:26:2d:00:02:6b

NIC=eth0
DNATDST=10.12.28.2

WAFHOST=homeserver.mediavillage.de


# Map Traffic going Fake-IP being flooded broadcasted
ip neigh change $DNATDST lladdr ff:ff:ff:ff:ff:ff nud permanent dev $NIC > /dev/null 2>&1
ip neigh add    $DNATDST lladdr ff:ff:ff:ff:ff:ff nud permanent dev $NIC > /dev/null 2>&1

# Monitor Reverse-Proxy and wake up Server if necessary
(
OLD=""
while sleep 1; do
  NEW=`awk '/server=\"'"$WAFHOST"'\"/ && /statuscode=\"503\"/ {print }' /var/log/reverseproxy.log | tail -1`
  echo $NEW
  if [ "$NEW" != "" -a "$NEW" != "$OLD" ]; then
    CURDATE=`date +"%Y:%m:%d-%T"`
    CURHOSTNAME=`hostname -f`
    CURPID=$$
    echo "$CURDATE $CURHOSTNAME [daemon:info] wol[$CURPID]:  Wake on WAF: $WAFHOST [$MAC]" >> /var/log/fallback.log
    ether-wake $MAC
    sleep 180
    OLD=$NEW
  fi
done
) > /dev/null 2>&1 &