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# $Id: tns.py 23 2006-11-08 15:45:33Z dugsong $
"""Transparent Network Substrate."""
import dpkt
class TNS(dpkt.Packet):
__hdr__ = (
('length', 'H', 0),
('pktsum', 'H', 0),
('type', 'B', 0),
('rsvd', 'B', 0),
('hdrsum', 'H', 0),
('msg', '0s', ''),
)
def unpack(self, buf):
dpkt.Packet.unpack(self, buf)
n = self.length - self.__hdr_len__
if n > len(self.data):
raise dpkt.NeedData('short message (missing %d bytes)' %
(n - len(self.data)))
self.msg = self.data[:n]
self.data = self.data[n:]
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