#!/bin/sh

# SPDX-License-Identifier: GPL-2.0+

#

# Copyright (C) 2012 Red Hat, Inc.

#

#

# This example prints SSIDs of connected Wi-Fi networks.

# GetDevices() D-Bus call returns all devices. We go through them, find Wi-Fi

# ones and ask for ActiveAccessPoint property. If the access point path is not

# empty ("/"), we can read its properties, like SSID.

#

NM_SERVICE_NAME="org.freedesktop.NetworkManager"

NM_OBJECT_PATH="/org/freedesktop/NetworkManager"

DEVICE_IFACE="org.freedesktop.NetworkManager.Device"

DEVICE_WIFI_IFACE="org.freedesktop.NetworkManager.Device.Wireless"

ACCESS_POINT_IFACE="org.freedesktop.NetworkManager.AccessPoint"

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_property()

{

  # first arg:  object path

  # second arg: interface

  # third arg:  property name

  # returns:    property value

  dbus-send --system --print-reply --dest=$NM_SERVICE_NAME "$1" $DBUS_PROPERTIES_GET string:"$2" string:"$3" | \

    grep "variant" | awk -F '"' '{ if (NF == 1) {FS=" "; n=split($0,a); print a[n];} else print $(NF-1); }'

}

is_wifi_device()

{

  DEV_TYPE=`get_property $device $DEVICE_IFACE "DeviceType"`

  if [ $DEV_TYPE -eq 2 ]; then

    return 0

  else

    return 1

  fi

}

show_active_ssids()

{

  for device in `get_devices`

  do

    INTERFACE=`get_property $device $DEVICE_IFACE "Interface"`

    if `is_wifi_device`; then

      ACTIVE_AP=`get_property $device $DEVICE_WIFI_IFACE "ActiveAccessPoint"`

      if [ "$ACTIVE_AP" != "/" ]; then

        SSID=`get_property $ACTIVE_AP $ACCESS_POINT_IFACE "Ssid"`

        BSSID=`get_property $ACTIVE_AP $ACCESS_POINT_IFACE "HwAddress"`

        echo "Device '$INTERFACE' is connected to '$SSID' (BSSID=$BSSID)"

      else

        echo "No active AP on device '$INTERFACE'" >&2

      fi

    fi

  done

}

# --- main program ---

# print currently connected SSID on all Wi-Fi devices

show_active_ssids