#!/usr/local/bin/python

import re
import subprocess
from subprocess import Popen,PIPE, call

# Bsd config file
config="/etc/rc.conf.local"
blocked_interfaces = ('wlan0' , 'wlan1')

# Ping all ips in 'ips'
def ping (ips, inf) :
        all=0
        suc=0

        # Run through all ips
        for ip in ips:

                # Do the ping in a shell and return the exitcode
                cmd='ping -t 1 %s' % ip
                ret = subprocess.call(cmd, shell=True, stdout=open('/dev/null', 'w'),
                        stderr=subprocess.STDOUT )

                # Update Statistics
                all+=1
                if ret : suc+=1 

        # Overall stats and return them
        ret = (suc*100/all)
        return inf + ": " + str(ret)

# Get all ips in the subnet (based on ip and mask)
def iprange (inf) :
	ips = []

	# Shell command: arp (all) (do not resolve) (interface)
	command = "arp -ani %s" % inf

	# Execute command
	output = Popen(command.split(), stdout=PIPE).communicate()[0]

	# output can be empty, we don't want that
	if output: 
		# Multi line output iterate through them
		for line in output.splitlines():

			# Filter ip addresses
			ips.append( line.split(' ')[1].strip('()') )
	return ips

# Open the config file and run through it
file = open (config)
for line in file.readlines():

        # Get variable's out of the config file and validate it
        match = re.match(r'ipv4_addrs_(.*?)="(.*?)/([\d]{1,2})(.*)"$', line)
        if match:

                # Get info
                inf = match.group(1)
                ip = match.group(2)
                mask = match.group(3)
		
		if inf not in blocked_interfaces:

                	# Call iprange, get all ip's in the subnet
              		allips = iprange(inf)
			print allips
                	# Call ping, print info
                	if allips: print ping(allips, inf)