#!/bin/sh

update_url="http://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.txt"

base_dnscache_dir=/opt/dnscache
dnscache_ip_dir=${base_dnscache_dir}/root/ip

if [ ! -d $base_dnscache_dir -o ! -d $dnscache_ip_dir ]; then
   echo
   echo "[ ERROR ]: Installtion directory for dnscache not found"
   echo "           exiting now.."
   echo
   exit 1
fi
   



tmp_file="/tmp/ipv4_addresss_space.$$.lst"

wget $update_url -O $tmp_file > /dev/null 2>&1

if [ $? -gt 0 ];then
   echo
   echo "[ ERROR ]: cannot fetch $update_url "
   echo "           exiting now.."
   echo
   rm -f $tmp_file
   exit 2
fi

adress_spaces=`grep -e " \(ALLOCATED\)$\|\(LEGACY\)$" $tmp_file | awk '{print$1}' | cut -d "/" -f 1 |  sed -e's/^0*\(.*\)$/\1/'`

if [ -z "$adress_spaces" ] ; then
   echo
   echo "[ ERROR ]: No adress space data found $update_url "
   echo "           exiting now.."
   echo
   rm -f $tmp_file
   exit 3
fi

## - delete old entries..
## -
rm -rf $dnscache_ip_dir/*

cd $dnscache_ip_dir
      
for i in $adress_spaces; do
   touch ${i}
done

## - send the servive a HUP signal
## -
svc -h $base_dnscache_dir

rm -f $tmp_file

exit 0