wifi-check

#!/bin/bash
##################################################################
# A Project of TNET Services, Inc
#
# Title:     WiFi_Check
# Author:    Kevin Reed (Dweeber)
#            dweeber.dweebs@gmail.com
# Updated:   R. Pusztai <rjpcomputing@gmail.com>
# Project:   Raspberry Pi Stuff
#
# Copyright: Copyright (c) 2012 Kevin Reed <kreed@tnet.com>
#            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
# Where and what you want to call the Lockfile
lockfile='/tmp/wifi-check.pid'
##################################################################
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
echo
echo "Starting WiFi check for wlan0"
date

# 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


# only run wifi-check script if wifi network has been configured

if grep -q "network" /etc/wpa_supplicant/wpa_supplicant.conf
then
  # We can perform check
  echo "Performing network check for wlan0"

  wlanstate="$(ifconfig wlan0| sed -En 's/127.0.0.1//;s/.*inet (addr:)?(([0-9]*\.){3}[0-9]*).*/\2/p')"
  echo $wlanstate
  if [ ! -z "$wlanstate" ]; then
      echo "wlan0 network is up"
  else

      # Only allow re-connection if the eth0 is not physically connected
      # isWireConnected=`cat /sys/class/net/eth0/operstate`
      # if [ "$isWireConnected" == "down" ]; then
          echo "wlan0 down! Attempting reconnection."
          echo "fconfig wlan0 down"
          ifconfig wlan0 down
          ifdown wlan0
          sleep 5
          echo "ifconfig wlan0 up"
          ifup wlan0
          ifconfig wlan0 up
      # else
      #   echo "Network connection down, but not reconnecting because eth0 is connected and configuring device."
      # fi
      sleep 10
      echo
      echo "IP addresses"
      hostname -I
      date
  fi
else
  echo "WiFi not configured"
fi

echo

# Check is complete, Remove Lock file and exit
echo "process is complete, removing lockfile"
rm $lockfile
exit 0

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# End of Script
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