Block/unblock MySQL 3306 access via iptables

block_mysql_access.bash

#!/bin/bash
#
# Usage: block_mysql_access.bash [true|false]
# "true" or empty input blocks 3306 access, via iptables
# "false" re-enables access to 3306
#

if [ $# -eq 0 ] || [ "$1" == "true" ]; then
	sudo -i /sbin/iptables -I INPUT -p tcp --destination-port 3306 -j REJECT
elif [ "$1" == "false" ]; then
	sudo -i /sbin/iptables -D INPUT -p tcp --destination-port 3306 -j REJECT
else
	echo "Bad input"
	exit 1	
fi