#!/bin/sh

# Paul Wouters <paul@xelerance.com>

# This folds back zone updates, dynamic updates, etc that nsd records

# in the ixfr.db and nsd.db files back into the zone files or vice-versa

# Default settings - do not edit these but /etc/sysconfig/nsd instead!

NSD_CONF="/etc/nsd/nsd.conf"

NSDC_PROG="/usr/sbin/nsdc"

NSD_CHECKCONF_PROG="/usr/sbin/nsd-checkconf"

NSD_AUTORELOAD="yes"

# Read in local settings.

[ -r /etc/sysconfig/nsd ] && . /etc/sysconfig/nsd

# Ideally check if ixfr.db newer then any zones, only then do

$NSDC_PROG -c $NSD_CONF patch > /dev/null 2>&1

# We try to only rebuild/reload when neccessary. If 1 zone is newer,

# we need to rebuild the db file.

# This might give problems with huge zones, eg TLD's, which cannot

# complete this operation within an hour, but it should work fine for

# most other uses.

case "$NSD_AUTORELOAD" in

	[Yy]|[Yy][Ee][Ss])

		database="`$NSD_CHECKCONF_PROG -o database $NSD_CONF`"

		$NSD_CHECKCONF_PROG -v $NSD_CONF | grep zonefile: | sed "s/^.*\"\(.*\)\"/\1/" | while read zonefile

		do

			if [ $zonefile -nt $database ]

			then

				echo "Zone $zonefile update requires database rebuild"

				$NSDC_PROG rebuild > /dev/null 2>&1

				$NSDC_PROG reload > /dev/null 2>&1

				break

			fi

		done

		;;

	*)

		;;	

esac

# nsd checks the serial in notify requests, so its better to send an

# occasional redundant notify, then to miss it.

# According to the nsd team, this is no longer neccessary

# $NSDC_PROG notify > /dev/null 2>&1