Thanks to Chris, i built my own script which detects if my phone is in range and locks/unlocks the screen, if the device is still away after a timeout of five seconds.
It's a bit quick and dirty, but works for me :)
#!/bin/bash
#################################################################
# Check if Bluetooth device is in range and lock/unlock screen. #
#################################################################
MAC=AA:BB:CC:DD:EE:FF
TIMEOUT=5
DEBUG=0
LASTSEEN=0
STATUS=0
PREVSTATUS=0
while true; do
DT="[$(date '+%F %T')]"
pgrep xscreensaver >/dev/null || xscreensaver -no-splash >/dev/null 2>&1 &
if [ -z "$RSSI" ]; then
sudo hcitool cc $MAC 2>/dev/null
fi
RSSI=$(sudo hcitool rssi $MAC 2>/dev/null | cut -d ' ' -f4)
[ $DEBUG -gt 0 ] && echo "$DT RSSI: $RSSI"
if [[ -n "$RSSI" && $RSSI -gt 0 ]]; then
LASTSEEN=$(date '+%s')
fi
if [[ $RSSI -eq 0 && $((`date '+%s'`-$LASTSEEN)) -gt $TIMEOUT ]]; then
STATUS=0
[ $DEBUG -gt 0 ] && echo "$DT Status: $STATUS Lastseen: $LASTSEEN Timeout: $((`date '+%s'`-$LASTSEEN))"
else
STATUS=1
[ $DEBUG -gt 0 ] && echo "$DT Status: $STATUS Lastseen: $LASTSEEN Timeout: $((`date '+%s'`-$LASTSEEN))"
fi
if [ $STATUS -ne $PREVSTATUS ]; then
PREVSTATUS=$STATUS
if [ $STATUS -gt 0 ]; then
[ $DEBUG -gt 0 ] && echo "$DT UnLock"
pgrep xscreensaver >/dev/null && xscreensaver-command -deactivate
xset dpms force on
pgrep xscreensaver >/dev/null && pkill xscreensaver
else
[ $DEBUG -gt 0 ] && echo "$DT Lock"
pgrep xscreensaver >/dev/null && xscreensaver-command -lock
fi
fi
[ $DEBUG -gt 0 ] && sleep 1
done
One may need to add one line to /etc/sudoers:
username ALL = NOPASSWD: /usr/bin/hcitool
Maybe this helps someone.
Cheers!
=========================
UPDATE 26.09.2017 !
I updated this a bit and wrote a Python script which detects the connected bluetooth device via DBus. Therefore the BT device should be paired first.
The script also tries to reconnect to the device if the connection was lost. This is because some devices do not reconnect by themselves (as my cellphone does).
This script does not read the RSSI signal strength because the DBus on my system does not report it (dunno why).
Because I'm under Gnome I use org.gnome.ScreenSaver as DBus interface to lock the screen. If you are on KDE or whatever you might want to change this in the code.
#!/usr/local/bin/python3
# encoding: utf-8
'''
bluescreen -- Locks your screen
bluescreen is a little python script which locks your screen as long as a bluetooth device is disconnected.
It also unlocks the screen when you return.
It uses the DBus to check if the device is connected and it locks the screen through DBus message calls.
The script uses the first BT adapter found in the system, mainly "hci0". This might be incorrect on some systems.
If so, check the source code below and do the necessary changes.
@author: Evil2000
@copyright: 2017 Evil2000
@license: LGPL
@contact: evil.2000@web.de
@deffield updated: 26.09.2017
'''
import time
import dbus
from dbus.mainloop.glib import DBusGMainLoop
from gi.repository import GObject as gobject
from pprint import pprint
'''
Debug flag should be clear
1 = Verbose
2 = Debug
'''
DEBUG = 0
'''
The BT MAC address of the device to monitor
'''
MAC = "11:22:33:AA:BB:CC"
''' =================================================================================================================== '''
# Replace : with _ in device MAC address
DEV_ID = MAC.replace(":", "_")
# Access the DBus main loop
dbus_loop = DBusGMainLoop()
# Connect to the system bus
sysbus = dbus.SystemBus(mainloop=dbus_loop)
# Retrieve the device BlueZ object
device = sysbus.get_object('org.bluez', "/org/bluez/hci0/dev_" + DEV_ID)
# Read the property if the device is connected
deviceConnected = device.Get("org.bluez.Device1", "Connected", dbus_interface='org.freedesktop.DBus.Properties')
if DEBUG > 1:
pprint(deviceConnected)
# Connect to the session bus
sesbus = dbus.SessionBus(mainloop=dbus_loop)
# Get the screen saver object
sSaver = sesbus.get_object('org.gnome.ScreenSaver', "/org/gnome/ScreenSaver")
# Lock the screen and start the screen saver (i.e. turn off the screen) if it isn't already
def lockScreen():
if not sSaver.GetActive(dbus_interface='org.gnome.ScreenSaver'):
if DEBUG:
print("["+time.strftime('%Y-%m-%d %H:%M:%S')+"] Locking Screen")
sSaver.Lock(dbus_interface='org.gnome.ScreenSaver')
# Try to connect to the device if it got disconnected. This is called from gobject.timeout_add_seconds() below
def tryConnect():
if not deviceConnected:
if DEBUG:
print("["+time.strftime('%Y-%m-%d %H:%M:%S')+"] Trying device reconnect")
device.Connect(dbus_interface='org.bluez.Device1')
return True
# The callback function from connect_to_signal. This handles the events sent by the DBus.
def cb(*args, **kwargs):
iface = args[0]
chgprop = args[1]
#extra = args[2]
if DEBUG > 1:
pprint(iface)
pprint(chgprop)
# chgprop contains a dictionary with the "Connected" key
# If it is present and the interface in which the event triggered is Device1, then...
if iface == "org.bluez.Device1" and "Connected" in chgprop:
# ... lock screen if device is NOT connected, otherwise disable the screen saver
if chgprop['Connected'] == True:
print("["+time.strftime('%Y-%m-%d %H:%M:%S')+"] connected")
deviceConnected = True
sSaver.SetActive(False, dbus_interface='org.gnome.ScreenSaver')
else:
print("["+time.strftime('%Y-%m-%d %H:%M:%S')+"] disconnected")
deviceConnected = False
lockScreen()
# Register a callback function which is triggered if the properties of the bluetooth device changes.
device.connect_to_signal("PropertiesChanged", cb, dbus_interface=None, interface_keyword='iface', member_keyword='member', path_keyword='path', sender_keyword="sender", destination_keyword="dest", message_keyword="message")
# Every 3 seconds, call the tryConnect function
gobject.timeout_add_seconds(3, tryConnect)
# Now, start the main loop.
loop = gobject.MainLoop()
loop.run()
# EOF
