check for literal . when checking IP against cache

q2a_usercheck.sh

@@ -8,7 +8,8 @@ test -f $cache || install -m 600 /dev/null $cache
 tail -F $logf | while read line ; do
 	case $line in (*"POST"*)
 		ip=`echo $line | awk '{print $1}'`
-		if ! grep -q $ip $cache; then
+		ip_regex=`echo $ip | sed 's/\./\\./g'`
+		if ! grep -q $ip_regex $cache; then
 			echo $ip >> $cache
 			/usr/local/bin/forumspam.sh "$ip"
 		fi