#!/bin/sh /etc/rc.common
# Copyright (C) 2006 OpenWrt.org

start() {
	include /lib/network
	scan_interfaces
	
	# The following is to automatically configure the DHCP settings
	# based on config settings. Feel free to replace all this crap
	# with a simple "dnsmasq" and manage everything via the
	# /etc/dnsmasq.conf config file
	
	[ -f /etc/dnsmasq.conf ] || exit
	
	args=""
	iface=lan
	config_get ifname "$iface" ifname
	config_get proto "$iface" proto
	
	[ "$proto" = static ] && dhcp_enable="${dhcp_enable:-1}"
	dhcp_start="${dhcp_start:-100}"
	dhcp_num="${dhcp_num:-50}"
	dhcp_lease="${dhcp_lease:-12h}"
	
	# if dhcp_enable is unset and there is a dhcp server on the network already, default to dhcp_enable=0
	[ -z "$dhcp_enable" ] && udhcpc -n -q -R -s /bin/true -i $ifname >&- && dhcp_enable="${dhcp_enable:-0}"
	
	# dhcp_enable=0 disables the dhcp server
	(
		[ -z "$dhcp_enable" -o "$dhcp_enable" -eq 1 ] && {
			# no existing DHCP server?
	
			# calculate settings
			config_get ipaddr "$iface" ipaddr
			config_get netmask "$iface" netmask
			eval $(ipcalc $ipaddr $netmask ${dhcp_start:-100} ${dhcp_num:-150})
			
			# and pass the args via config parser defines
			echo "${dhcp_enable:+@define dhcp_enable 1}"
			echo "@define netmask $NETMASK"
			echo "@define start $START"
			echo "@define end $END"
			echo "@define lease ${dhcp_lease:-12h}"
		}
	
		# ignore requests from wan interface
		config_get wan_proto wan proto
		config_get wan_ifname wan ifname
		[ -z "$wan_proto" -o "$wan_proto" = "none" ] || echo "@define wan_ifname $wan_ifname"
	
		cat /etc/dnsmasq.conf
	) | awk -f /lib/config/template.awk | dnsmasq -C /proc/self/fd/0
}

stop() {
	killall dnsmasq
}