#!/bin/sh
# Jeff Brown
# October 26, 2010
# Version: 1.0
# http://photonicsguy.ca/eeepc/


# Set your your ESSID for your house or a known safe location here
SAFE_ESSID='CHANGE_ME_TO_HOME_AP_NAME'

# Screensaver program
SSAVER="/usr/bin/kdesktop_lock --forcelock"


########################################################################

IW_STATE=`/sbin/iwconfig 2> /dev/null | grep ESSID | awk '{print $4}'`
IW_LINK=`cat /proc/net/wireless | grep ra0 | awk '{printf "%.0f", $3}'`

PROG=`echo -n $SSAVER |awk '{print $1}'`
if pgrep -f $PROG ; then
    echo "$PROG already running, exiting..."
    exit
fi
if [ $IW_STATE = "ESSID:\"$SAFE_ESSID\"" -a $IW_LINK -gt 5 ]; then
    echo "Connected to $IW_STATE"
    if [ "$1" = "lock" ]; then
        echo "Locking screen per user request."
        xset -display :0.0 dpms force off         
        $SSAVER &
    fi
else
    echo "Disconnected from $IW_STATE (Trying to match $SAFE_ESSID)"
    xset -display :0.0 dpms force off
    $SSAVER &
fi