#!/usr/bin/env bash

#_zone_files_dir="/etc/bind/master"
_zone_files_dir=/root/tmp/master

## - Settings SOA Record
## -
_soa_nameserver="a\.ns\.oopen\.de"
_soa_admin="domreg\.oopen\.de"

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

## --- some functions
## ---
echononl(){
   echo X\\c > /tmp/shprompt$$
   if [ `wc -c /tmp/shprompt$$ | awk '{print $1}'` -eq 1 ]; then
      echo -e -n "$*\\c" 1>&2
   else
       echo -e -n "$*" 1>&2
   fi
   rm /tmp/shprompt$$
}

fatal(){
   echo ""
   echo -e "[ \033[31m\033[1mError\033[m ]: $*"
   echo ""
   echo -e "\t\033[31m\033[1mInstalllation wird abgebrochen\033[m\033[m"
   echo ""
   exit 1
}

warn (){
   echo ""
   echo -e "\t[ \033[33m\033[1mWarning\033[m ]: $*"
   echo ""
}

echo_ok() {
   echo -e "\033[75G[ \033[32mok\033[m ]"
}
echo_failed(){
   echo -e "\033[75G[ \033[1;31mfailed\033[m ]"
}
echo_skipped() {
   echo -e "\033[75G[ \033[33m\033[1mskipped\033[m ]"
}
## ---
## --- END: functions


echo ""
echo ""
echo -e "\033[32m--\033[m"
echo ""
echo ""

## - Read list of zonefiles
## -
while IFS='' read -r -d '' zone_file ; do

   declare -i _serial_new=`date +%Y%m%d01`

   filename=$(basename "$zone_file")
   zone="${filename%.*}"

   echo ""
   echo -e "\tlooking at $zone_file.."


   ## - 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

   echononl "\t   Changing SOA Record.."
   if ! grep -E "^.*IN\s+SOA\s+${_soa_nameserver}\.\s+${_soa_admin}\.\s+\("  > /dev/null 2>&1 $zone_file ; then
      perl -i -n -p -e "s/^(.*IN\s+SOA).*$/\1 ${_soa_nameserver}. ${_soa_admin}. \(/" $zone_file
      if [ "$?" = "0" ]; then
         echo_ok
      else
         echo_failed
      fi
   else
      echo_skipped
      continue
   fi

   ## - Set new serial
   ## -
   echononl "\t   Renew serial.."
   perl -i -n -p -e "s#^(\s*) $__serial(.*)#\1 $_serial_new\2#" $zone_file
   if [ "$?" = "0" ]; then
      echo_ok
   else
      echo_failed
   fi

   ## - Reload Zone
   ## -
   echononl "\t   Reload Zone $zone.."
   /usr/sbin/rndc reload $zone > /dev/null 2>&1
   if [ "$?" = "0" ]; then
      echo_ok
   else
      echo_failed
   fi

   sleep 1

done < <(find $_zone_files_dir -mindepth 1 -maxdepth 1 -type f -print0)

echo ""
exit