# load uci functions
. /lib/functions.sh

configure() {
	## dns
	uci -q del dhcp.@dnsmasq[0].server
	if dnsservers=$(uci -q get gateway.@dns[0].server); then
		for f in $dnsservers; do
			uci add_list dhcp.@dnsmasq[0].server=$f
			uci add_list dhcp.@dnsmasq[0].server="/in-addr.arpa/$f"
			uci add_list dhcp.@dnsmasq[0].server="/ip6.arpa/$f"
		done
	else
		echo "WARNING: No DNS servers set!"
	fi

	# remove all domain autogenerated entries
	remove_domains() {
		local name="$1"

		case $(uci -q get dhcp."$name".addedbyautoconfig) in
			/etc/layer3.d/35-dns | /etc/uci-defaults/90-fff-dhcp)
				uci -q del dhcp."$name" ;;
		esac
	}
	config_load dhcp
	config_foreach remove_domains domain

	local dnsips
	local have_dns=false

	# gather all ips belonging to the router
	dnsips=$(
		uci -q batch <<- EOF | cut -d / -f1 | sort -u
			get network.client.ip6addr
			get network.client.ipaddr
			get gateway.@gateway[0].peer_ip
			get gateway.@gateway[0].peer_ip6
		EOF
	)

	for ip in $dnsips; do
		ip=$(echo "$ip" | cut -d / -f1)
		case "$ip" in
			fe80*) continue ;;
		esac

		have_dns=true
		uci -q add dhcp domain > /dev/null
		uci -q set dhcp.@domain[-1].ip="$ip"
		uci -q set dhcp.@domain[-1].name="local.fff.community"
		uci -q set dhcp.@domain[-1].addedbyautoconfig="/etc/layer3.d/35-dns"
	done

	if ! $have_dns; then
		echo "WARNING: No valid device ip available for local DNS."
	fi
}

apply() {
	uci commit dhcp
}

revert() {
	uci revert dhcp
}