#!/bin/sh
setup_eth()
{
	for part in $(nvram get unused_ifnames); do
		[ "$part" = "$INTERFACE" ] && exit 0
	done
	ifconfig "$INTERFACE" up 2>&- >&-
}

find_name()
{
	pppoa_ifname="atm0" # hack for ppp over atm, which has no ${proto}_ifname
	interfaces="lan wan wifi $(nvram get ifnames)"
	for ifname in $interfaces; do
		IFTYPE="${ifname}"
		IFPROTO="$(nvram get ${IFTYPE}_proto)"
		IFACE="$(nvram get ${IFTYPE}_ifname)"
		case "$IFPROTO" in
			""|none);;
			static|dhcp)
				[ "${IFACE}" = "$INTERFACE" ] && return 0
				[ "${IFACE%%[0-9]*}" = "br" ] && {
					for part in $(nvram get ${IFTYPE}_ifnames); do
						[ "$part" = "$INTERFACE" ] && return 0
					done
				}
			;;
			*)
				[ "$(nvram get ${IFTYPE}_device)" = "$INTERFACE" \
				  -a -x /sbin/ifup.${IFPROTO} ] && return 0
			;;
		esac
	done
	IFACE=""
	IFTYPE=""
	IFPROTO=""
	return 255
}

do_ifup() {
	if="$3"
	if_proto="$(nvram get ${2}_proto)"
	
	pidfile=/var/run/${if}.pid
	[ -f $pidfile ] && $DEBUG kill $(cat $pidfile)

	case "$1" in
		static)
			ip=$(nvram get ${2}_ipaddr)
			ip6=$(nvram get ${2}_ip6addr)
			netmask=$(nvram get ${2}_netmask)
			gateway=$(nvram get ${2}_gateway)
	
			$DEBUG ifconfig $if $ip ${netmask:+netmask $netmask} broadcast + up
			[ -n "$ip6" ] && $DEBUG ifconfig $if add $ip6

			${gateway:+$DEBUG route add default gw $gateway}
	
			[ -f /tmp/resolv.conf ] || {
				debug "# --- creating /tmp/resolv.conf ---"
				for dns in $(nvram get ${2}_dns); do
					echo "nameserver $dns" >> /tmp/resolv.conf
				done
			}
			
			env -i ACTION="ifup" INTERFACE="${2}" PROTO=static /sbin/hotplug "iface" &
		;;
		dhcp)
			DHCP_IP=$(nvram get ${2}_ipaddr)
			DHCP_NETMASK=$(nvram get ${2}_netmask)
			$DEBUG ifconfig $if $ip ${netmask:+netmask $netmask} broadcast + up
	
			DHCP_ARGS="-i $if ${DHCP_IP:+-r $DHCP_IP} -b -p $pidfile"
			DHCP_HOSTNAME=$(nvram get ${2}_hostname)
			DHCP_HOSTNAME=${DHCP_HOSTNAME%%.*}
			[ -z $DHCP_HOSTNAME ] || DHCP_ARGS="$DHCP_ARGS -H $DHCP_HOSTNAME"
			[ "$if_proto" = "pptp" ] && DHCP_ARGS="$DHCP_ARGS -n -q" || DHCP_ARGS="$DHCP_ARGS -R &"
			oldpid=$(cat $pidfile)
			${DEBUG:-eval} "udhcpc $DHCP_ARGS"
			pidof udhcpc | grep "$oldpid" >&- 2>&- && {
				sleep 1
				kill -9 $oldpid
			}
			# hotplug events are handled by /usr/share/udhcpc/default.script
		;;
		*)
			if [ -x "/sbin/ifup.$1" ]; then
				( $DEBUG . /sbin/ifup.$1 ${2} $3 )
			fi
		;;
	esac
}

do_register()
{
	case "${INTERFACE%%[0-9]*}" in
		eth) setup_eth;;
	esac

	[ -z "$IFTYPE" -o -z "$IFPROTO" ] && {
		find_name || {
			case "${INTERFACE%%[0-9]*}" in
				wds) 
					for tmp in lan wifi; do
						[ -z "$IFPROTO" ] && [ "$(nvram get ${tmp}_ifname)" = "br0" ] && {
							IFPROTO="$(nvram get ${tmp}_proto)"
							IFTYPE="${tmp}"
						}
					done
					[ -z "$IFPROTO" ] && return 0
				;;
				atm)
					for tmp in lan wan wifi $(nvram get ifnames); do
						[ "$(nvram get ${tmp}_proto)" = "pppoa" ] && {
							do_ifup "pppoa" "$tmp" "$INTERFACE"
							return 0
						}
					done
				;;
				*)
					return 0
				;;
			esac
		}
	}

	case "${INTERFACE%%[0-9]*}" in 
		ppp|atm);;
		*)
			mac=$(nvram get ${IFTYPE}_hwaddr)
			${mac:+$DEBUG ifconfig $INTERFACE down hw ether $mac}
		;;
	esac

	if="$(nvram get ${IFTYPE}_ifname)"
	if [ "${if%%[0-9]}" = "br" ]; then
		if_valid "$INTERFACE" && {
			ifconfig "$if" 2>&- >&- || {
				stp=$(nvram get ${IFTYPE}_stp)
				$DEBUG brctl addbr "$if"
				$DEBUG brctl setfd "$if" 0
				$DEBUG brctl stp "$if" "${stp:-0}"
			}

			if [ "$INTERFACE" != "$if" ]; then
				$DEBUG ifconfig "$INTERFACE" 0.0.0.0 up
				brctl addif "$if" "$INTERFACE"
			else
				do_ifup "$IFPROTO" "$IFTYPE" "$if"
			fi
		}
	else 
		[ "${INTERFACE%%[0-9]*}" = "ppp" ] || do_ifup "$IFPROTO" "$IFTYPE" "$if"
	fi
}

do_unregister() {
	[ -z "$IFTYPE" -o -z "$IFPROTO" ] && find_name
	[ -z "$IFTYPE" -o -z "$IFPROTO" ] && return 0
	
	[ "${IFACE%%[0-9]*}" = "br" ] && {
		if [ "$INTERFACE" != "$IFACE" ]; then
			brctl delif "$IFACE" "$INTERFACE" 2>&- >&-
		else
			brctl delbr "$IFACE" 2>&- >&-
		fi
	}
	
	case "$IFPROTO" in
		pppoe|pppoa|pptp) 
			killall pppd 2>&- >&-
		;;
		dhcp)
			[ -f /var/run/${INTERFACE}.pid ] && kill "$(cat /var/run/${INTERFACE}.pid)" 2>&- >&-
		;;
	esac

	[ "${INTERFACE%%[0-9]*}" = "atm" ] || ifconfig "$INTERFACE" 0.0.0.0 down 2>&-
}

case "$ACTION" in
	add|register) do_register;;
	remove|unregister) do_unregister;;
esac