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# $Id: ah.py 34 2007-01-28 07:54:20Z dugsong $
"""Authentication Header."""
import dpkt
class AH(dpkt.Packet):
__hdr__ = (
('nxt', 'B', 0),
('len', 'B', 0), # payload length
('rsvd', 'H', 0),
('spi', 'I', 0),
('seq', 'I', 0)
)
auth = ''
def unpack(self, buf):
dpkt.Packet.unpack(self, buf)
self.auth = self.data[:self.len]
buf = self.data[self.len:]
import ip
try:
self.data = ip.IP.get_proto(self.nxt)(buf)
setattr(self, self.data.__class__.__name__.lower(), self.data)
except (KeyError, dpkt.UnpackError):
self.data = buf
def __len__(self):
return self.__hdr_len__ + len(self.auth) + len(self.data)
def __str__(self):
return self.pack_hdr() + str(self.auth) + str(self.data)
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