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#!/usr/bin/env python
# Impacket - Collection of Python classes for working with network protocols.
#
# Copyright Fortra, LLC and its affiliated companies
#
# All rights reserved.
#
# This software is provided under a slightly modified version
# of the Apache Software License. See the accompanying LICENSE file
# for more information.
#
import unittest
from array import array
from impacket.ImpactPacket import Ethernet, EthernetTag
class TestEthernet(unittest.TestCase):
def setUp(self):
# Ethernet frame with a 802.1Q tag (TPID=0x8100, PCP=5, DEI=0, VID=3315)
# and ethertype 0x0800 (IPv4)
self.frame = b'\x54\xab\xa3\xb9\x38\x3d\xe2\xef\x8d\xc7\xa8\x5e\x81\x00\xac\xf3\x08\x00'
self.eth = Ethernet(self.frame)
def test_01(self):
"""Test Ethernet getters"""
self.assertEqual(self.eth.get_packet(), self.frame)
self.assertEqual(self.eth.get_header_size(), 18)
self.assertEqual(self.eth.get_ether_type(), 0x0800)
# Check source and destination MACs
self.assertEqual(self.eth.get_ether_dhost(), array('B', self.frame[0:6]))
self.assertEqual(self.eth.get_ether_shost(), array('B', self.frame[6:12]))
def test_02(self):
"""Test Ethernet setters"""
self.eth.set_ether_type(0x88cc)
self.assertEqual(self.eth.get_ether_type(), 0x88cc)
# Swap source and destination MACs
dhost = self.eth.get_ether_dhost()
shost = self.eth.get_ether_shost()
self.eth.set_ether_dhost(shost)
self.eth.set_ether_shost(dhost)
self.assertEqual(self.eth.get_ether_dhost(), array('B', self.frame[6:12]))
self.assertEqual(self.eth.get_ether_shost(), array('B', self.frame[0:6]))
def test_03(self):
"""Test EthernetTag getters"""
tag = self.eth.pop_tag()
self.assertEqual(tag.get_buffer_as_string(),b'\x81\x00\xac\xf3')
self.assertEqual(tag.get_tpid(), 0x8100)
self.assertEqual(tag.get_pcp(), 5)
self.assertEqual(tag.get_dei(), 0)
self.assertEqual(tag.get_vid(), 3315)
def test_04(self):
"""Test EthernetTag setters"""
tag = self.eth.pop_tag()
tag.set_tpid(0x88a8)
tag.set_pcp(2)
tag.set_dei(1)
tag.set_vid(876)
self.assertEqual(tag.get_buffer_as_string(), b'\x88\xa8\x53\x6c')
def test_05(self):
"""Test manipulation with VLAN tags"""
def check_tags(*tags):
self.assertEqual(self.eth.tag_cnt, len(tags))
self.assertEqual(self.eth.get_header_size(), 14 + 4*len(tags))
self.assertEqual(self.eth.get_ether_type(), 0x0800)
for i,tag in enumerate(tags):
self.assertEqual(self.eth.get_tag(i).get_buffer_as_string(), tag)
# Add S-tag (outer tag, closest to the Ethernet header)
self.eth.push_tag(EthernetTag(0x88a85001))
check_tags(b'\x88\xa8\x50\x01', b'\x81\x00\xac\xf3')
# Set C-tag (inner tag, closest to the payload) to default
self.eth.set_tag(1, EthernetTag())
check_tags(b'\x88\xa8\x50\x01', b'\x81\x00\x00\x00')
# Insert a deprecated 802.1QinQ header between S-tag and C-tag
self.eth.push_tag(EthernetTag(0x910054d2), index=1)
check_tags(b'\x88\xa8\x50\x01', b'\x91\x00\x54\xd2', b'\x81\x00\x00\x00')
# Test negative indices
tags = {}
for i in range(-3,3):
tags[i] = self.eth.get_tag(i).get_buffer_as_string()
self.assertEqual(tags[-1], tags[2])
self.assertEqual(tags[-2], tags[1])
self.assertEqual(tags[-3], tags[0])
# Accessing non-existent tags raises IndexError
self.assertRaises(IndexError, self.eth.get_tag, 3)
self.assertRaises(IndexError, self.eth.get_tag, -4)
self.assertRaises(IndexError, self.eth.set_tag, 3, EthernetTag())
self.assertRaises(IndexError, self.eth.set_tag, -4, EthernetTag())
# Test Ethernet constructor
data = self.eth.get_buffer_as_string()
eth_copy = Ethernet(data)
self.assertEqual(eth_copy.tag_cnt, 3)
self.assertEqual(eth_copy.get_header_size(), 26)
self.assertEqual(eth_copy.get_ether_type(), 0x0800)
# Remove the deprecated 802.1QinQ header and check resulting frame
eth_copy.pop_tag(1)
self.assertEqual(eth_copy.tag_cnt, 2)
self.assertEqual(eth_copy.get_packet(), self.frame[:12] + tags[0] + tags[2] + self.frame[-2:])
if __name__ == '__main__':
unittest.main(verbosity=1)
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