gistfile1.py

from SystemConfiguration import *
import syslog

def checkIP(self, interface):
		"""This function accepts a BSD interface name and returns the system IP Address
		 	 for that interface using the SystemConfiguration Framework.
		---
		Arguments:
			interface - Either en0 or en1, the BSD interface name of a Network Adapter.
		Returns:
			bool - True or False depending on if the interface is both active and is on the Huron Network.
		"""
		store = SCDynamicStoreCreate(None, "global-network", None , None)
		ifKey = "State:/Network/Interface/" + interface + "/IPv4"
		keyStore = SCDynamicStoreCopyValue(store, ifKey)

                # If the Print fails, then there's no IP Address for that interface and we can assume
                #    that the interface is in a down state - we return false
		try:
			print "The IP Address for interface: " + interface + " is: " + keyStore['Addresses'][0]
		except TypeError:
			syslog.syslog(syslog.LOG_ALERT, "Interface " + interface + " not active.")
			return "false"

                # If the interface isn't down, use our checkNetwork method to check that the IP is on our
                #    Huron Network.
		return self.checkNetwork(str(keyStore['Addresses'][0]))


---------------------------OR THIS ------------------------

#!/usr/bin/python2.5
#
#  LinkState.py - Library function for determining that state of network adapters
#

__author__ = 'Gary Larizza (gary@huronhs.com)'
__version__ = '0.1'

import subprocess

_IPCONFIG = '/usr/sbin/ipconfig'

def status(NetPort):
	"""Uses /usr/sbin/ipconfig to check link status of a network adapter
	
	Args:
		NetPort: One of 'en0' or 'en1' - Ethernet or Airport
	Returns:
		Exit status code which determines link status. 0 is active, 1 is inactive.
	"""
	
	command = [_IPCONFIG, 'getifaddr', NetPort]
	task = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
	(stdout, stderr) = task.communicate()
	return task.returncode