#!/bin/sh
# Copyright (C) 2006 OpenWrt.org
if [ $1 = "wan" ]; then
	uci revert -P /var/state/ network.ifup_running
fi
. /etc/functions.sh
[ $# = 0 ] && { echo "  $0 <group>"; exit; }
[ "x$1" = "x-a" ] && {
	config_cb() {
		[ interface != "$1" -o -z "$2" ] || eval "$0 $2"
	}
	config_load network
	exit
}

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 "$cfg" device
# when system boot up, iptables custom chain may not be established, 
# if we call ifdown at booting time, we should not do delif() to prevent error msg. 
uptime_chk=$(cat /proc/uptime | awk 'FS="[.]+" {print $1}')
[ "static" = "$proto" -a "$uptime_chk" -gt "30" ] && {
	env -i ACTION="ifdown" INTERFACE="$cfg" DEVICE="$iface" PROTO=static /sbin/hotplug-call "iface" &
}

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

# make sure all locks are removed
for lock in "/var/lock/dhcp-$iface" "/var/lock/ppp-$iface"; do
	[ -f "$lock" ] && {
		lock -u "$lock"
		sleep 1
	}
done

# kill active ppp daemon and other processes
config_get ifname "$cfg" ifname
[ "$cfg" == "3gwan" ] && {
	pids="$(head -n1 -q /var/run/${ifname}.pid /var/run/ppp-${cfg}.pid /var/run/ppp1-3g.pid 2>/dev/null)"
} || {
	pids="$(head -n1 -q /var/run/${ifname}.pid /var/run/ppp-${cfg}.pid 2>/dev/null)"
}	
for pid in $pids; do 
	[ -d "/proc/$pid" ] && {
		kill $pid
		[ -d "/proc/$pid" ] && {
			sleep 1
			kill -9 $pid 2>/dev/null >/dev/null
		}
	}
done
wan3gbackup=$(uci -q get network.3gwan.backup || echo 0)
[ "$cfg" == "wan" -a "$wan3gbackup" == "0" ] && {
	ps | grep pppd | grep -v grep && {
		killall pppd
		logger -t ifdown "kill all pppd..."
	}
}

rm -f /var/run/${ifname}.pid /var/run/ppp-${cfg}.pid 
[ "$cfg" == "3gwan" ] && rm -f /var/run/ppp1-3g.pid

config_get ifname "$cfg" ifname
config_get device "$cfg" device

[ ."$device" != ."$ifname" ] || device=
for dev in $ifname $device; do
	ifconfig "$dev" 0.0.0.0 down >/dev/null 2>/dev/null
done
if [ $1 = "wan" ]; then
	ifconfig br-wan down >/dev/null 2>/dev/null
fi

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

# 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
[ "$cfg" = "wan" ] && > /tmp/resolv.conf.auto || > "/tmp/resolv.conf.$cfg"

/lib/firewall6.sh stop