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

. /etc/functions.sh
[ $# = 0 ] && { echo "  $0 <group>"; exit; }
[ "x$1" = "x-a" ] && {
	[ -e "/tmp/resolv.conf.auto" ] && rm /tmp/resolv.conf.auto
	config_cb() {
		[ interface != "$1" -o -z "$2" ] || eval "$0 $2"
	}
	config_load network
	exit
}

### ctc ###
if [ -z "$CONFIG_SECTION" ] ; then
	CONFIG_SECTION=$1
fi
###########

include /lib/network
scan_interfaces

cfg=$1
debug "### ifdown $cfg ###"

config_get proto "$cfg" proto
[ -z "$proto" ] && { echo "interface not found."; exit; }

config_get iface "$cfg" device
config_get ifname "$cfg" ifname
config_get device "$cfg" device
if [ -z "$ifname" ] ; then
	ifname=`umngcli get ifname@${cfg}`
fi
#note: must get ip6_forwarding before the interface, esp PPP, is down
#ip6_forwarding=`sysctl -n net.ipv6.conf.${ifname}.forwarding`

[ "static" = "$proto" -o "none" = "$proto" ] && {
	env -i ACTION="ifdown" INTERFACE="$cfg" DEVICE="$iface" PROTO="$proto" /sbin/hotplug-call "iface"
}

# call interface stop handler
( type "stop_interface_$proto" ) >/dev/null 2>/dev/null && eval "stop_interface_$proto '$cfg'"

### ctc ###
CNT=0
PPP_PID=`pgrep -l -f pppd | grep "nic-$iface" | cut -d ' ' -f 1`
while [ -n "$PPP_PID" ] ; do
	if [ "$CNT" -ge 50 ] ; then
		for PID in $PPP_PID ; do
			kill -9 $PID
		done
		break
	else
		for PID in $PPP_PID ; do
			kill $PID
		done
	fi
	#
	usleep 100000 # 0.1 sec
	PPP_PID=`pgrep -l -f pppd | grep "nic-$iface" | cut -d ' ' -f 1`
	#
	let CNT=$CNT+1
done

DHCP_PID=`pgrep -l -f udhcpc | grep "\-i $iface" | cut -d ' ' -f 1`
while [ -n "$DHCP_PID" ] ; do
	for PID in $DHCP_PID ; do
		kill $PID
	done
	usleep 100000 # 0.1 sec
    DHCP_PID=`pgrep -l -f udhcpc | grep "\-i $iface" | cut -d ' ' -f 1`
done
###########

[ ."$device" != ."$ifname" ] || device=
for dev in $ifname $device; do
	### ctc added to prevent RALINK 3883 interface down ###
#	ifconfig "$dev" 0.0.0.0 down >/dev/null 2>/dev/null
	if [ "$dev" != "eth0" ] ; then
		ifconfig "$dev" 0.0.0.0 down >/dev/null 2>/dev/null
	fi
	##################
	## bitonic update, ctc added
	. /usr/sbin/arc-ipv4-linkdown.sh $cfg
	## end of bitonic update

#	### ygchen add ###
#	if [ "$ip6_forwarding" == "2" ]; then
#	    . /usr/sbin/arc-ipv6-linkdown.sh $cfg $dev
#	fi
#	##################
done

glb_ip6_enable=`ccfg_cli get ip6_enable@system`
if [ "$glb_ip6_enable" == "1" ]; then
	ip6_enable=`umngcli get ip6_enable@${cfg}`
	if [ "$ip6_enable" == "1" ] ; then
		ip6_proto=`umngcli get ip6_proto@${cfg}`
		if [ "$ip6_proto" == "dhcp" ] ; then
			echo "[ifdown] dhcp6c_release $cfg" >> /tmp/ipv6.log
			/usr/sbin/dhcp6c_release
		fi
	fi
fi

config_get iftype "$cfg" type
[ "bridge" = "$iftype" ] && brctl delbr "$ifname" >/dev/null 2>/dev/null

### ctc ###
## remove the interface's dns entries
#remove_dns "$cfg"
resolv_update.sh $ifname
###########

# remove the interface's network state
uci_revert_state network "$1"

# revert aliases state as well
config_get aliases "$1" aliases
for config in $aliases; do
	uci_revert_state network "$config"
done