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import re
def lookup(address, port, s):
"""
Parse the pfctl state output s, to look up the destination host
matching the client (address, port).
Returns an (address, port) tuple, or None.
"""
spec = "%s:%s"%(address, port)
for i in s.split("\n"):
if "ESTABLISHED" in i and spec in i:
m = re.match(".* (\S*)->%s" % spec, i)
if m:
s = m.group(1).split(":")
if len(s) == 2:
return s[0], int(s[1])
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