Below is the file 'plugins/iptables.py' from this revision. You can also download the file.

import os

def run():
    # for now, just check that there are rules
    iptables_command = '/sbin/iptables -L INPUT -n'

    fd = os.popen(iptables_command)
    result = fd.read()
    fd.close()

    line_count = len(result.split('\n'))
    if line_count > 2:
	return []
    else:
	return [("medium", 'no iptables rules in chain "INPUT"')]