#!/bin/sh
#
# Stefan Tomanek <stefan@pico.ruhr.de>
#
# /etc/pm/sleep.d/55ifupdown-network
#
# Shut down specific network interfaces when suspending the system
# and bring them back up on resume
#

. "${PM_FUNCTIONS}"

# specify interfaces in /etc/pm/config.d/ifupdown
#
# use device names or "all"
SHUTDOWN_INTERFACES=${SHUTDOWN_INTERFACES:-""}

# devices to bring up  when resuming, use device names or "auto"
# to bring up the devices that were shut down during suspend
BRINGUP_INTERFACES=${BRINGUP_INTERFACES:-""}

item_in_list() {
    local ITEM=$1
    local LIST=$2
    local JOKER=${3:-"all"}

    for L in $LIST; do
        echo "Checking $L"
        if [ x"$L" = x"$ITEM" ] || [ x"$L" = x"$JOKER" ]; then
            return 0
        fi
    done
    return 1
}

suspend_ifupdown() {
    local CLOSED_INTERFACES=""

    while IFS='=' read DEVICE PROFILE; do
        # ignore the loopback device
        if [ x"$DEVICE" != "xlo" ]; then
            echo "Inspecting $DEVICE"
            if item_in_list "$DEVICE" $SHUTDOWN_DEVICES "all"; then
                echo "Shutting down $DEVICE"
                /sbin/ifdown $DEVICE

                CLOSED_INTERFACES="$CLOSED_INTERFACES
$DEVICE=$PROFILE"

            fi
        fi
    done < /etc/network/run/ifstate

    echo $CLOSED_INTERFACES | savestate ifupdown_interfaces
}

resume_ifupdown() {
    restorestate ifupdown_interfaces | \
    while IFS='=' read DEVICE PROFILE; do
        # we ignore the profile the interface was in due
        # to the existance of mapping scripts
        if item_in_list "$DEVICE" "$BRINGUP_INTERFACES" "auto"; then
            echo "Bringing up $DEVICE"
            /sbin/ifup "$DEVICE"
        fi
    done
}

case "$1" in
	hibernate|suspend)
            suspend_ifupdown
        ;;
	thaw|resume)
            resume_ifupdown
        ;;
	*)
            exit $NA
        ;;
esac