# $Id: sll.py 23 2006-11-08 15:45:33Z dugsong $
# -*- coding: utf-8 -*-
"""Linux libpcap "cooked" capture encapsulation."""
from __future__ import absolute_import
from . import arp
from . import dpkt
from . import ethernet
[docs]class SLL(dpkt.Packet):
"""Linux libpcap "cooked" capture encapsulation.
TODO: Longer class information....
Attributes:
__hdr__: Header fields of SLL.
TODO.
"""
__hdr__ = (
('type', 'H', 0), # 0: to us, 1: bcast, 2: mcast, 3: other, 4: from us
('hrd', 'H', arp.ARP_HRD_ETH),
('hlen', 'H', 6), # hardware address length
('hdr', '8s', ''), # first 8 bytes of link-layer header
('ethtype', 'H', ethernet.ETH_TYPE_IP),
)
_typesw = ethernet.Ethernet._typesw
[docs] def unpack(self, buf):
dpkt.Packet.unpack(self, buf)
try:
self.data = self._typesw[self.ethtype](self.data)
setattr(self, self.data.__class__.__name__.lower(), self.data)
except (KeyError, dpkt.UnpackError):
pass
[docs]def test_sll():
slldata = b'\x00\x00\x00\x01\x00\x06\x00\x0b\xdb\x52\x0e\x08\xf6\x7f\x08\x00\x45\x00\x00\x34\xcc\x6c\x40\x00\x40\x06\x74\x08\x82\xd9\xfa\x8e\x82\xd9\xfa\x0d'
slltest = SLL(slldata)
assert slltest.type == 0
assert slltest.hrd == 1
assert slltest.hlen == 6
assert slltest.hdr == b'\x00\x0b\xdb\x52\x0e\x08\xf6\x7f'
assert slltest.ethtype == 0x0800
# give invalid ethtype of 0x1234 to make sure error is caught
slldata2 = b'\x00\x00\x00\x01\x00\x06\x00\x0b\xdb\x52\x0e\x08\xf6\x7f\x12\x34\x45\x00\x00\x34\xcc\x6c\x40\x00\x40\x06\x74\x08\x82\xd9\xfa\x8e\x82\xd9\xfa\x0d'
slltest = SLL(slldata2)