# $Id: pim.py 23 2006-11-08 15:45:33Z dugsong $
# -*- coding: utf-8 -*-
"""Protocol Independent Multicast."""
from __future__ import absolute_import
from . import dpkt
from .decorators import deprecated
[docs]class PIM(dpkt.Packet):
"""Protocol Independent Multicast.
TODO: Longer class information....
Attributes:
__hdr__: Header fields of PIM.
TODO.
"""
__hdr__ = (
('_v_type', 'B', 0x20),
('rsvd', 'B', 0),
('sum', 'H', 0)
)
@property
def v(self):
return self._v_type >> 4
@v.setter
def v(self, v):
self._v_type = (v << 4) | (self._v_type & 0xf)
@property
def type(self):
return self._v_type & 0xf
@type.setter
def type(self, type):
self._v_type = (self._v_type & 0xf0) | type
def __bytes__(self):
if not self.sum:
self.sum = dpkt.in_cksum(dpkt.Packet.__bytes__(self))
return dpkt.Packet.__bytes__(self)
[docs]def test_pim():
pimdata = PIM(b'\x20\x00\x9f\xf4\x00\x01\x00\x02\x00\x69')
assert pimdata.v == 2
assert pimdata.type == 0
# test setters
pimdata.v = 3
pimdata.type = 1
assert bytes(pimdata) == b'\x31\x00\x9f\xf4\x00\x01\x00\x02\x00\x69'