Added IPv6, ESSID check, Silent mode, Wired switch

WiFi_Check

@@ -5,6 +5,9 @@
 # Title:     WiFi_Check
 # Author:    Kevin Reed (Dweeber)
 #            dweeber.dweebs@gmail.com
+# Enhanced by:
+#            Youp Mol
+#            wifi_check @ youp.nospam.net
 # Project:   Raspberry Pi Stuff
 #
 # Copyright: Copyright (c) 2012 Kevin Reed <kreed@tnet.com>
@@ -18,6 +21,9 @@
 # Uses a lock file which prevents the script from running more
 # than one at a time.  If lockfile is old, it removes it
 #
+# Enhancements added:
+# IPv6 capability, static configuration support, silent-mode, switching off wired interface
+#
 # Instructions:
 #
 # o Install where you want to run it from like /usr/local/bin
@@ -28,59 +34,95 @@
 # 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 
+# */5 * * * * /usr/local/bin/WiFi_Check silent
 #
 ##################################################################
 # Settings
 # Where and what you want to call the Lockfile
 lockfile='/var/run/WiFi_Check.pid'
 # Which Interface do you want to check/fix
 wlan='wlan0'
+wired='eth0'
 ##################################################################
-echo
-echo "Starting WiFi check for $wlan"
-date
-echo 
+$silent || echo -n "Starting WiFi check for $wlan"
 
 # 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
+	# 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"
+		$silent || echo -n .
+		exit 1
+	else
+		# Old Lockfile, Remove it
+		#echo "Old lockfile, Removing Lockfile"
+		$silent || echo -n .
+		rm $lockfile
+		sleep .5
+	fi
+else
+	$silent || echo -n .
 fi
 # If we get here, set a lock file using our current PID#
 #echo "Setting Lockfile"
+$silent || echo -n .
 echo $$ > $lockfile
 
 # We can perform check
-echo "Performing Network check for $wlan"
-if ifconfig $wlan | grep -q "inet addr:" ; then
-    echo "Network is Okay"
+#echo "Performing Network check for $wlan"
+if iwconfig $wlan|grep -qe "ESSID:\".*\""; then
+	#echo ESSID found
+	$silent || echo -n .
+	if ifconfig $wlan | grep -q "inet addr:" ; then
+		#echo "Network is Okay"
+		$silent || echo . OK
+		logger Wifi connection on $wlan is OK
+		ifdown $wired 2&>1 > /dev/null 
+	elif ifconfig $wlan | grep -q "inet6 addr:" ; then
+		#echo "Network \(IPv6 only\) is Okay"
+		$silent || echo . OK
+		logger Wifi connection on $wlan \(IPv6 only\) is OK
+		ifdown $wired 2&>1 > /dev/null 
+	else
+		$silent || echo "Network connection down! Attempting reconnection."
+		logger Wifi connection on $wlan is DOWN, trying to reconnect... 
+		date
+		ifdown $wlan
+		sleep 5
+		ifup --force $wlan
+		if ifconfig $wlan | grep -q "inet addr:" ; then
+			logger Wifi connection on $wlan seems to be up and running again.
+			ifdown $wired 2&>1 > /dev/null 
+		else
+			logger Wifi connection on $wlan is DOWN, enabling the wired connection...
+			ifup $wired 2&>1 > /dev/null 
+		fi
+	fi
 else
-    echo "Network connection down! Attempting reconnection."
-    ifdown $wlan
-    sleep 5
-    ifup --force $wlan
-    ifconfig $wlan | grep "inet addr"
+	$silent || echo "Network connection down! Attempting reconnection."
+	logger Wifi connection on $wlan is DOWN, trying to reconnect... 
+	date
+	ifdown $wlan
+	sleep 5
+	ifup --force $wlan
+	if ifconfig $wlan | grep -q "inet addr:" ; then
+		logger Wifi connection on $wlan seems to be up and running again.
+		ifdown $wired 2&>1 > /dev/null 
+	else
+		logger Wifi connection on $wlan is DOWN, enabling the wired connection...
+		ifup $wired 2&>1 > /dev/null 
+	fi
 fi
 
-echo 
-echo "Current Setting:"
-ifconfig $wlan | grep "inet addr:"
-echo
+$silent || echo -n "Current Setting:"
+$silent || iwconfig $wlan | grep -zoe "ESSID:\".*\""|xargs echo -e|tr -d \\n\\t;ifconfig $wlan | grep -oe "addr:[a-zA-Z0-9.:]*"
+
 
 # Check is complete, Remove Lock file and exit
 #echo "process is complete, removing lockfile"
 rm $lockfile
-exit 0
 
 ##################################################################
 # End of Script