#!/bin/sh
[ -z "$1" ] && echo "Error: should be run by udhcpc" && exit 1

. /etc/functions.sh
include /lib/network
RESOLV_CONF="/tmp/resolv.conf.auto"

change_state () {
	[ -n "$ifc" ] || return
	uci_revert_state "$1" "$2" "$3" "$4"
	uci_set_state "$1" "$2" "$3" "$4"
}

uci_get() {
	[ -n "$ifc" ] || return
	uci -P /dev/null get "$1" 2>/dev/null
}

setup_interface () {
	local old_ip
	local old_broadcast
	local old_subnet
	local old_router
	local old_dns
	local user_dns
	local user_router

	[ -n "$ifc" ] && {
		config_get old_ip        "$ifc" ipaddr
		config_get old_broadcast "$ifc" broadcast
		config_get old_subnet    "$ifc" netmask
	}

	[ "$1" = "ifup" ] \
	|| [ "$ip" != "$old_ip" ] \
	|| [ "${broadcast:-+}" != "$old_broadcast" ] \
	|| [ "${subnet:-255.255.255.0}" != "$old_subnet" ] && {
		echo "udhcpc: ifconfig $interface $ip netmask ${subnet:-255.255.255.0} broadcast ${broadcast:-+}"
		ifconfig $interface $ip netmask ${subnet:-255.255.255.0} broadcast ${broadcast:-+}

		change_state network "$ifc" ipaddr "$ip"
		change_state network "$ifc" broadcast "${broadcast:-+}"
		change_state network "$ifc" netmask "${subnet:-255.255.255.0}"
	}


	# Default Route
	[ -n "$ifc" ] && {
		change_state network "$ifc" lease_gateway "$router"
		config_get old_router "$ifc" gateway
		user_router=$(uci_get "network.$ifc.gateway")
		[ -n "$user_router" ] && router="$user_router"
	}

	[ -n "$router" ] && [ "$router" != "0.0.0.0" ] && [ "$router" != "255.255.255.255" ] && [ "$router" != "$old_router" ] && {
		echo "udhcpc: setting default routers: $router"

		local valid_gw=""
		for i in $router ; do
			route add default gw $i dev $interface
			valid_gw="${valid_gw:+$valid_gw|}$i"
		done
		
		eval $(route -n | awk '
			/^0.0.0.0\W{9}('$valid_gw')\W/ {next}
			/^0.0.0.0/ {print "route del -net "$1" gw "$2";"}
		')

		change_state network "$ifc" gateway "$router"
	}

	# CIDR STATIC ROUTES (rfc3442)
	[ -n "$cidrroute" ] && {
		# This defines how many CIDR Routes can be assigned so that we do not enter
		# an endless loop on malformed data
		MAXCIDRROUTES=24;
		while [ ${MAXCIDRROUTES} -gt "0" ]; do
			# Format is
			# $MASK $NW $GW
			# $NW == AAA.BBB.CCC.DDD
			# $GW == EEE.FFF.CCC.DDD
			# $MASK AAA.[BBB].[CCC].[DDD] EEE.FFF.GGG.HHH
			#   1    2    3     4     5    6   7   8   9
			MASK=$(echo $cidrroute | awk '{ print $1 }')
			if [ ${MASK} = "0" ] ; then
				# $MASK EEE.FFF.GGG.HHH
				#   1    2   3   5   6
				NW="0"
				GW=$(echo $cidrroute | awk '{ print $2"."$3"."$4"."$5 }' )
			elif [ ${MASK} -le "8" ] ; then
				# $MASK AAA EEE.FFF.GGG.HHH
				#   1    2   3   5   6   7
				NW=$(echo $cidrroute | awk '{ print $2 }' )
				GW=$(echo $cidrroute | awk '{ print $3"."$4"."$5"."$6 }' )
			elif [ ${MASK} -le "16" ] ; then
				# $MASK AAA.BBB EEE.FFF.GGG.HHH
				#   1    2   3   5   6   7   8
				NW=$(echo $cidrroute | awk '{ print $2"."$3 }' )
				GW=$(echo $cidrroute | awk '{ print $4"."$5"."$6"."$7 }' )
			elif [ ${MASK} -le "24" ] ; then
				# $MASK AAA.BBB.CCC EEE.FFF.GGG.HHH
				#   1    2   3   4   5   6   7   8
				NW=$(echo $cidrroute | awk '{ print $2"."$3"."$4 }' )
				GW=$(echo $cidrroute | awk '{ print $5"."$6"."$7"."$8 }' )

			else
				# $MASK AAA.BBB.CCC.DDD EEE.FFF.GGG.HHH
				#   1    2   3   4   5   6   7   8   9
				NW=$(echo $cidrroute | awk '{ print $2"."$3"."$4"."$5 }' )
				GW=$(echo $cidrroute | awk '{ print $6"."$7"."$8"."$9 }' )
			fi
			echo [$ROUTECOUNTER] Route Network: $NW/$MASK Gateway: $GW on $interface

			# TODO: Check for malformed data here to eliminate counter workaround
			# Malformed data is: ... or xxx... or xxx.yyy.. or xxx.yyy.zzz.

			[ -n "$NW" ] && [ -n "$GW" ] && {
				route add $NW gw $GW dev $interface
			}

			# Clear the strings incase they don't get set next time around
			if [ ${NW} = "0" ]; then
				NW=""
			fi
			TMP="$MASK $NW $GW "
			NW=""
			GW=""

			# Remove the '.' so that we can delete them from the input with sed
			TMP=$(echo $TMP | sed "s/\./ /g")

			# Remove the previous entry from cidrroute
			cidrroute=$(echo $cidrroute | sed "s/$TMP//g")

			# Add to counter
			let ROUTECOUNTER=$ROUTECOUNTER+1;
			let MAXCIDRROUTES=$MAXCIDRROUTES-1;

			# Leave the loop if cidrroutes is empty (we've parsed everything)
			[ ! -n "$cidrroute" ] && break

		done

		echo "done."
	}

	# DNS
	config_get old_dns "$ifc" dns
	user_dns=$(uci_get "network.$ifc.dns")
	[ -n "$user_dns" ] && dns="$user_dns"

	[ -n "$dns" ] && [ ! -s "${RESOLV_CONF}" -o "$dns" != "$old_dns" ] && {
		echo "udhcpc: setting dns servers: $dns"
		echo -n > "${RESOLV_CONF}.tmp"
		for i in $dns ; do
			echo "nameserver $i" >> "${RESOLV_CONF}.tmp"
		done
		${domain:+echo search $domain} >> "${RESOLV_CONF}.tmp"
		mv "${RESOLV_CONF}.tmp" "$RESOLV_CONF"

		change_state network "$ifc" dnsdomain "$domain"
		change_state network "$ifc" dns "$dns"
	}

	[ -n "$ifc" ] || return

	# UCI State
	change_state network "$ifc" lease_server "$serverid"
	change_state network "$ifc" lease_acquired "$(date '+%s')"
	change_state network "$ifc" lease_lifetime "$lease"
	[ -n "$ntpsrv" ] && 	change_state network "$ifc" lease_ntpsrv "$ntpsrv"
	[ -n "$timesvr" ] && 	change_state network "$ifc" lease_timesrv "$timesvr"
	[ -n "$hostname" ] &&	change_state network "$ifc" lease_hostname "$hostname"
	[ -n "$timezone" ] && 	change_state network "$ifc" lease_timezone "$timezone"


	# Hotplug
	env -i ACTION="$1" INTERFACE="$ifc" DEVICE="$ifname" PROTO=dhcp /sbin/hotplug-call iface
}


scan_interfaces
applied=
for ifc in $interfaces __default; do
	if [ "$ifc" = __default ]; then
		ifc=""
		[ -n "$applied" ] && continue
	else
		config_get ifname "$ifc" ifname
		[ "$ifname" = "$interface" ] || continue

		config_get proto "$ifc" proto
		[ "$proto" = "dhcp" ] || continue
		applied=true
	fi

	case "$1" in
		deconfig)
			ifconfig "$interface" 0.0.0.0
			[ -n "$ifc" ] && {
				env -i ACTION="ifdown" INTERFACE="$ifc" DEVICE="$ifname" PROTO=dhcp /sbin/hotplug-call iface
			
				config_get device "$ifc" device
				config_get ifname "$ifc" ifname
				config_get aliases "$ifc" aliases
				uci_revert_state network "$ifc"
				[ -n "$device" ] && uci_set_state network "$ifc" device "$device"
				[ -n "$ifname" ] && uci_set_state network "$ifc" ifname "$ifname"
				[ -n "$aliases" ] && uci_set_state network "$ifc" aliases "$aliases"
			}
		;;
		renew)
			setup_interface update
		;;
		bound)
			setup_interface ifup
		;;
	esac
done

# user rules
[ -f /etc/udhcpc.user ] && . /etc/udhcpc.user

exit 0