#!/bin/sh

# SPDX-License-Identifier: GPL-2.0+

#

# Copyright (C) 2012 Red Hat, Inc.

#

# This example takes a device interface name as a parameter and tells

# NetworkManager to disconnect that device (using Disconnect()), closing

# down any network connection it may have

NM_SERVICE_NAME="org.freedesktop.NetworkManager"

NM_OBJECT_PATH="/org/freedesktop/NetworkManager"

DEVICE_IFACE="org.freedesktop.NetworkManager.Device"

DEVICE_DISCONNECT=${DEVICE_IFACE}".Disconnect"

NM_GET_DEVICES="org.freedesktop.NetworkManager.GetDevices"

DBUS_PROPERTIES_GET="org.freedesktop.DBus.Properties.Get"

get_devices()

{

  dbus-send --system --print-reply --dest=$NM_SERVICE_NAME $NM_OBJECT_PATH $NM_GET_DEVICES | \

    grep "object path" | cut -d '"' -f2

}

get_device_property()

{

  # first arg:  device object path

  # second arg: property name

  # returns:    property value

  dbus-send --system --print-reply --dest=$NM_SERVICE_NAME "$1" $DBUS_PROPERTIES_GET string:$DEVICE_IFACE string:"$2" | \

    grep "variant" | awk '{print $3}' | sed 's/"//g'

}

disconnect_device ()

{

  # first arg: device interface name

  for device in `get_devices`

  do

    DEV_INTERFACE=`get_device_property "$device" "Interface"`

    if [ "$DEV_INTERFACE" = "$1" ]; then

      echo "Device with interface '$1' found -> disconnecting."

      dbus-send --system --print-reply --dest=$NM_SERVICE_NAME $device $DEVICE_DISCONNECT

      return 0

    fi

  done

  echo "Device with interface '$1' not found." >&2

  return 1

}

# --- main program ---

if [ ! -n "$1" ]; then

  echo "Usage: `basename $0` <interface name>"

  exit 2

fi

# disconnect device

disconnect_device $1