#!/usr/bin/env bash

#_zone_files_dir=/etc/bind/master
_zone_files_dir=/root/tmp/master
_comment=";; - IPv6 disabled "

cp -a $_zone_files_dir ${_zone_files_dir}.BAK-`date +%Y-%m-%d-%H%M`

__zonefiles=`grep -l -E "^${_comment}.*\s*AAAA" ${_zone_files_dir}/*.zone`

for zone_file in $__zonefiles ; do

   _serial_new=`date +%Y%m%d01`

   echo -e "\tconverting $zone_file .."
      
   _replaced=false

   ## - calculate new serial
   ## -
   declare -i __serial=`grep -e "[0-9]\{10\}" $zone_file | grep serial | awk '{print$1}'`
   while [ ! $_serial_new -gt $__serial ]; do
      let _serial_new++
   done

   perl -i -n -p -e "s/^${_comment}(.*\s+AAAA\s+.*)$/\1/" $zone_file
   if [ $? -eq 0 ]; then
      _replaced=true
   fi


   ## - setze neue serial
   ## -
   if $_replaced ; then
      perl -i -n -p -e "s#^(\s*)\s$__serial(.*)#\1 $_serial_new\2#" $zone_file
   fi

done

exit