#!/bin/sh

# Copyright (c) 2008..2009 Dirk Jagdmann <doj@cubic.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

# $Header: /www/llg/tools/edit_zone,v 1.1 2009/06/16 20:55:21 doj Exp $

# Website: http://llg.cubic.org/tools/#dns_inc_serial

# you have to compile and install the dns_inc_serial.c file from the
# website mentioned above into your path.
#
# Usage: edit_zone "zone filename"
#
# your zone filename should be the full domain name. All zone files
# must be located in the directory configured by ZONE_DIRECTORY below.

ZONE_DIRECTORY=/var/named

# check configuration
if [ ! -d "$ZONE_DIRECTORY" ] ; then
    echo "$ZONE_DIRECTORY is no directory! Please configure edit_zone."
    exit 1
fi

# check command line arguments
if [ -z "$1" ] ; then
    echo "usage: edit_zone <zonefile>"
    exit 1
fi

ZONE="$1"
ZONEFILE="$ZONE_DIRECTORY/$ZONE"

if [ ! -f "$ZONEFILE" ] ; then
    echo "did not find $ZONEFILE"
    exit 1
fi

# choose an editor
if [ -z "$EDITOR" ] ; then
    EDITOR="$VISUAL"
    if [ -z "$EDITOR" ] ; then
	EDITOR=vi
    fi
fi

# create backup file
TMP=`mktemp`
cp -f "$ZONEFILE" $TMP

# edit
$EDITOR "$ZONEFILE"

# check if anything changed
cmp -s "$ZONEFILE" $TMP
RES=$?
rm -f $TMP
if [ $RES = 0 ] ; then
    echo "file not changed."
    exit 0
fi

# check zone for errors
named-checkzone "$ZONE" "$ZONEFILE" || exit 1

# increase serial number
dns_inc_serial "$ZONEFILE"

# load new zone
#/etc/init.d/bind9 restart
rndc reload "$ZONE"