#!/bin/bash
##################################################################
# A Project of TNET Services, Inc
#
# Title:     WiFi_Check
# Author:    Kevin Reed (Dweeber)
#            [email protected]
# Project:   Raspberry Pi Stuff
#
# Copyright: Copyright (c) 2012 Kevin Reed <[email protected]>
#            https://github.com/dweeber/WiFi_Check
#
# Purpose:
#
# Script checks to see if WiFi has a network IP and if not
# restart WiFi
#
# Uses a lock file which prevents the script from running more
# than one at a time.  If lockfile is old, it removes it
#
# Instructions:
#
# o Install where you want to run it from like /usr/local/bin
# o chmod 0755 /usr/local/bin/WiFi_Check
# o Add to crontab
#
# Run Every 5 mins - Seems like ever min is over kill unless
# this is a very common problem.  If once a min change */5 to *
# once every 2 mins */5 to */2 ...
#
# */5 * * * * /usr/local/bin/WiFi_Check
#
##################################################################
# Settings
PATH="/usr/sbin:/sbin:$PATH"
echo "Current Path(s)"
echo $PATH
# Where and what you want to call the Lockfile
lockfile='/tmp/ram/WiFi_Check.pid'
# Which Interface do you want to check/fix
wlan='wlan0'
##################################################################
echo "Starting WiFi check for $wlan"
date
echo

# Check to see if there is a lock file
if [ -e $lockfile ]; then
    # A lockfile exists... Lets check to see if it is still valid
    pid=$(cat $lockfile)
    if kill -0 &>1 > /dev/null $pid; then
        # Still Valid... lets let it be...
        echo "Process still running, Lockfile valid"
        exit 1
    else
        # Old Lockfile, Remove it
        echo "Old lockfile, Removing Lockfile"
        rm $lockfile
    fi
fi
# If we get here, set a lock file using our current PID#
echo "Setting Lockfile"
echo $$ > $lockfile

# We can perform check
echo "Performing Network check for $wlan"
broken=0
if ifconfig $wlan | grep -q "inet addr:" ; then
    echo "Network is seemingly Okay"
    echo
    echo "Ping Test:"
    ping 10.0.0.1 -c 1
    if [ $? -eq 0 ];then
        echo "  Wifi Working"
    else
        echo "  Wifi seems down"
        ping 10.0.0.1 -c 1
        if [ $? -eq 0 ];then
            echo "False alarm"
        else
            echo "Wifi Down"
            broken=1
        fi
    fi
    echo
else
    broken=1
fi
if [ $broken -eq 1 ];then
    echo "Network connection down! Attempting reconnection."
    ifdown $wlan
    sleep 5
    ifup --force $wlan
    ifconfig $wlan | grep "inet addr"
    sleep 10
fi

echo
echo "Current Setting:"
ifconfig $wlan | grep "inet addr:"
echo

# Check is complete, Remove Lock file and exit
echo "Process is complete, removing lockfile"
rm $lockfile

# Backup Log
logFile="/tmp/ram/wifiCheck"
if [ -f $logFile ];then
    if [ -f $logFile.log ];then
        if [ -f $logFile.log.old ];then
            if [ -f $logFile.log.older ];then
                cp $logFile.log.older $logFile.log.oldest
            fi
            cp $logFile.log.old $logFile.log.older
        fi
        cp $logFile.log $logFile.log.old
    fi
    cp $logFile $logFile.log
fi
exit 0

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# End of Script
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