#!/bin/sh

PRIVATE_LOCATION="/var/packages/DNSServer/target"
PKG_APP_PATH="${PRIVATE_LOCATION}/app"

GetSupportNetTopology()
{
	echo `/usr/syno/bin/synogetkeyvalue /etc/synoinfo.conf support_net_topology`
}

GetNetTopology()
{
	echo `/usr/syno/bin/synogetkeyvalue /etc/synoinfo.conf net_topology`
}

IsRouterMode()
{
	local tmp1=$(GetSupportNetTopology)
	local tmp2=$(GetNetTopology)
	if [ "${tmp1}" == "yes" ] && [ "${tmp2}" == "router" ]; then
		return 1
	else
		return 0
	fi
}

GetInternalNetwork()
{
	local os_name=$(/usr/syno/bin/synogetkeyvalue /etc/synoinfo.conf os_name)
	if [ "x$os_name" != "x" ] && [ "x$os_name" == "xNSM" ]; then
		echo $(/usr/syno/bin/synodhcpservertool -s)
	else
		echo $(/usr/syno/sbin/synonetdtool --get-internal-network)
	fi
}

GetDnsMasqSubnetList()
{
	local list=$(GetInternalNetwork)
	local retStr=""
	for subnet in ${list}
	do
		if [ "${retStr}" == "" ]; then
			retStr=${subnet} #first time
		else
			retStr=${retStr}";"${subnet}
		fi
	done
	retStr=${retStr}";"
	echo ${retStr}
}

LoadDnsMasqSubnetListToAllowRecursive()
{
	if [ 1 -eq $1 ]; then
		szSubnetList=$(GetDnsMasqSubnetList)
		`${PKG_APP_PATH}/synodnstool --set-dnsmasq-allow-recursion $szSubnetList`
	else
		`${PKG_APP_PATH}/synodnstool --clear-dnsmasq-allow-recursion`
	fi
}

Load()
{
	if [ -e "/var/packages/DNSServer/enabled" ]; then
		# register local subnet ip for allowing recursive query
		IsRouterMode
		LoadDnsMasqSubnetListToAllowRecursive $?
	fi
}

case $1 in
	--sdk-mod-ver)
	#Print SDK support version
	echo "1.0";
	;;
	--name)
	#Print package name
	echo "synodns"
	;;
	--pkg-ver)
	#Print package version
	echo "1.0";
	;;
	--vendor)
	#Print package vendor
	echo "Synology";
	;;
	--pre)
	;;
	--post)
	# do nothing when link updown on booting-up step
	if /usr/syno/bin/synobootseq --is-booting-up > /dev/null 2>&1 ; then
		exit
	fi
	# do nothing when link updown shutdown step
	if /usr/syno/bin/synobootseq --is-shutdown > /dev/null 2>&1 ; then
		exit
	fi
	Load
	;;
	*)
	echo "Usage: $0 --sdk-mod-ver|--name|--pkg-ver|--vendor|--pre|--post"
	;;
esac