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import sys
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:ESTABLISHED" in i and spec in i:
s = i.split()
if len(s) > 4:
if sys.platform.startswith("freebsd"):
# strip parentheses for FreeBSD pfctl
s = s[3][1:-1].split(":")
else:
s = s[4].split(":")
if len(s) == 2:
return s[0], int(s[1])
raise RuntimeError("Could not resolve original destination.")
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