#!/bin/sh
# USB Networking script
# Copyright (C) 2007 INdT.
# @author Abner Jose de Faria Silva <abner.silva@indt.org.br>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

DESC="USB Networking"

INITFSPATH=/mnt/initfs
MODULENAME="g_ether"
MODULEPATH=$INITFSPATH/lib/modules/$(uname -r)/$MODULENAME.ko
CONFIGPATH=/etc/default/usbnet

MOUNTPOINT=/media/mmc

LSMOD=/bin/lsmod
RMMOD=/sbin/rmmod
INSMOD=/sbin/insmod
IFUP=/sbin/ifup
IFDOWN=/sbin/ifdown

test -e "$MODULEPATH" || exit 0
test -x "$IFUP" || exit 0
test -x "$IFDOWN" || exit 0
test -x "$LSMOD" || exit 0
test -x "$RMMOD" || exit 0
test -x "$INSMOD" || exit 0

test -r "$CONFIGPATH" && . $CONFIGPATH


print_error()
{
    echo "failed."
    echo "$1"
}

start_usbnet()
{
    if $LSMOD | grep -q "$MODULENAME"; then
        echo "$DESC is already configured."
        return
    fi

    echo -n "Starting $DESC: "

    for f in 1 2; do
        umount "$MOUNTPOINT$f" > /dev/null 2>&1
    done

    if ! $INSMOD "$MODULEPATH" > /dev/null 2>&1; then
        print_error "Error loading $MODULEPATH."
        return
    fi

    if ! $IFUP -i "$INTERFACE_CONF" usb0 > /dev/null 2>&1; then
        print_error "Error configuring usb0."
        return;
    fi

    echo "done."
}

stop_usbnet()
{
    echo -n "Stopping $DESC: "

    if ! $IFDOWN -i "$INTERFACE_CONF" usb0 > /dev/null 2>&1; then
        print_error "Error deconfiguring usb0."
        return;
    fi

    if ! $RMMOD "$MODULENAME" > /dev/null 2>&1; then
        print_error "Error unloading $MODULENAME"
        return
    fi

    echo "done."
}

case "$1" in
    start)
        start_usbnet
        ;;
    stop)
        stop_usbnet
        ;;
    restart|force-reload)
        stop_usbnet
        start_usbnet
        ;;
    *)
        echo "Usage: $(basename $0) {start|stop|restart|force-reload}" >&2
        exit 1
        ;;
esac

echo ""

exit 0