isc-dhcp: update to 4.3.3. Migrate from oldplackages

Signed-off-by: Antony Antony <antony@phenome.org>

net/isc-dhcp/files/dhcrelay4.init

@@ -0,0 +1,53 @@
+#!/bin/sh /etc/rc.common
+# Copyright (C) 2012 OpenWrt.org
+
+START=91
+
+SERVICE_SIG="KILL"
+SERVICE_PID_FILE="/var/run/dhcrelay4.pid"
+SERVICE_USE_PID=1
+
+start() {
+	. /lib/functions/network.sh
+	config_load dhcrelay
+	local args=""
+
+	local enabled
+	config_get_bool enabled ipv4 enabled 0
+	[ "$enabled" -eq 0 ] && return 0
+
+	# listen interfaces
+	local interfaces
+	local ifname
+	config_get interfaces ipv4 interfaces
+	for net in $interfaces; do
+		if network_get_device ifname "$net"; then
+			append args "-i $ifname"
+		fi
+	done
+
+	# link selection sub-option (RFC3527)
+	local link_selection
+	config_get link_selection ipv4 link_selection
+	if network_get_device ifname "$link_selection"; then
+		append args "-l $ifname"
+	fi
+
+	# relay mode
+	local relay_mode
+	config_get relay_mode ipv4 relay_mode
+	[ -n "$relay_mode" ] && append args "-m $relay_mode"
+
+	# dhcp server address
+	local server
+	config_get server ipv4 dhcpserver
+	[ -n "$server" ] || return 0
+	append args "$server"
+
+	service_start /usr/sbin/dhcrelay -4 -q \
+		-pf $SERVICE_PID_FILE $args
+}
+
+stop() {
+	service_stop /usr/sbin/dhcrelay
+}