Bug! MAC_FILTER ID generates a non-unique ID depending on wether the mac...

Bug! MAC_FILTER ID generates a non-unique ID depending on wether the mac address was provided in upper- or lower case. This can lead to multiple MAC_FILTER rules for the same mac address instead of removing an already existing rule since the ID couldn't be found. This has been fixed!

ipturntables.sh

@@ -1083,14 +1083,16 @@ formatAsHexID() {
 				checkMACArgFormat "$2"
 				(( $? != 0 )) && error 91 "MAC_FILTER expects an ether address (MAC) (eg: 06:00:17:d3:97:b4)"
 
-				printf "# filtering '%s' MAC address in %s chain.\n" $2 $sz
+				printf "# filtering '%s' MAC address in %s chain.%s\n" $2 $sz $(ip n | grep "$2" >/dev/nul && printf " (WARNING! Mac address appears to be a host of the local network.)")
 
-				ID=$(printf "MAC_FILTER_%s_%s" $sz ${2//:/})
+				sy=${2//:/}
+				sy=${sy,,}
+				ID=$(printf "MAC_FILTER_%s_%s" $sz $sy)
 				deleteRules $sz "$ID"
 
 				$IPTABLES -I $sz 1 -m mac --mac-source $2 -j DROP -m comment --comment "$ID"
 
-				unset sz;
+				unset sz; unset sy;
 				shift; shift
 				;;