zchange.sh

#!/bin/bash

#
# Short hacked script to automatically increase
# the serial of a zonehead file for BIND9. The
# zonehead file has the following format.
#
# Examle zonehead file
# ====================
# $TTL 86400
# @   IN SOA ns1.xtain.net. postmaster.xtain.net. (
#     2012131011   ; serial
#     14400        ; refresh
#     1800         ; retry
#     604800       ; expire
#     86400 )      ; minimum
# 
#
# Lizenz: CC0 / Public Domain - http://creativecommons.org/publicdomain/zero/1.0/deed.de




if [ "$(id -u)" -gt 0 ]; then
  echo "Only root can do this" > /dev/stderr
  exit 255
fi

ZONEHEADFILE="/dnszones/shared/zonehead.part"
ZONEHEAD=$(cat "${ZONEHEADFILE}")
NEWDATE=$(date +%Y%d%m)
BASEMATCH="^\([[:space:]]\+\)\([0-9]\{8\}\)\([0-9]\{2\}\)\([[:space:]]\+;[[:spac                                                                                                                                                             e:]]\+serial\)$"
CURRENTDATE=$(echo "${ZONEHEAD}" | sed -ne "s/${BASEMATCH}/\2/p")
CURRENTCOUNT=$(echo "${ZONEHEAD}" | sed -ne "s/${BASEMATCH}/\3/p" | sed 's/0*//'                                                                                                                                                             )

echo "Old Zonehead:"
echo "${ZONEHEAD}"
echo "###############################"

if [ "${CURRENTDATE}" == "${NEWDATE}" ]; then
  CURRENTCOUNT=$((${CURRENTCOUNT}+1))
else
  CURRENTCOUNT=1
fi

echo "${ZONEHEAD}" | sed -e "s/${BASEMATCH}/\1${NEWDATE}$(printf '%02d' ${CURREN                                                                                                                                                             TCOUNT})\4/" > ${ZONEHEADFILE}

echo "New Zonehead:"
cat "${ZONEHEADFILE}"
echo "###############################"

/etc/rc.d/named restart
sleep 2
/etc/rc.d/named restart