mirror of
https://github.com/fortra/impacket
synced 2026-06-08 14:15:13 +00:00
gabrielg5
117 lines
4.4 KiB
Python
117 lines
4.4 KiB
Python
#!/usr/bin/env python
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# Impacket - Collection of Python classes for working with network protocols.
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#
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# Copyright Fortra, LLC and its affiliated companies
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#
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# All rights reserved.
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#
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# This software is provided under a slightly modified version
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# of the Apache Software License. See the accompanying LICENSE file
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# for more information.
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#
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import unittest
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from array import array
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from impacket.ImpactPacket import Ethernet, EthernetTag
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class TestEthernet(unittest.TestCase):
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def setUp(self):
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# Ethernet frame with a 802.1Q tag (TPID=0x8100, PCP=5, DEI=0, VID=3315)
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# and ethertype 0x0800 (IPv4)
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self.frame = b'\x54\xab\xa3\xb9\x38\x3d\xe2\xef\x8d\xc7\xa8\x5e\x81\x00\xac\xf3\x08\x00'
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self.eth = Ethernet(self.frame)
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def test_01(self):
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"""Test Ethernet getters"""
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self.assertEqual(self.eth.get_packet(), self.frame)
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self.assertEqual(self.eth.get_header_size(), 18)
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self.assertEqual(self.eth.get_ether_type(), 0x0800)
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# Check source and destination MACs
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self.assertEqual(self.eth.get_ether_dhost(), array('B', self.frame[0:6]))
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self.assertEqual(self.eth.get_ether_shost(), array('B', self.frame[6:12]))
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def test_02(self):
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"""Test Ethernet setters"""
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self.eth.set_ether_type(0x88cc)
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self.assertEqual(self.eth.get_ether_type(), 0x88cc)
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# Swap source and destination MACs
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dhost = self.eth.get_ether_dhost()
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shost = self.eth.get_ether_shost()
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self.eth.set_ether_dhost(shost)
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self.eth.set_ether_shost(dhost)
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self.assertEqual(self.eth.get_ether_dhost(), array('B', self.frame[6:12]))
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self.assertEqual(self.eth.get_ether_shost(), array('B', self.frame[0:6]))
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def test_03(self):
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"""Test EthernetTag getters"""
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tag = self.eth.pop_tag()
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self.assertEqual(tag.get_buffer_as_string(),b'\x81\x00\xac\xf3')
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self.assertEqual(tag.get_tpid(), 0x8100)
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self.assertEqual(tag.get_pcp(), 5)
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self.assertEqual(tag.get_dei(), 0)
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self.assertEqual(tag.get_vid(), 3315)
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def test_04(self):
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"""Test EthernetTag setters"""
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tag = self.eth.pop_tag()
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tag.set_tpid(0x88a8)
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tag.set_pcp(2)
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tag.set_dei(1)
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tag.set_vid(876)
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self.assertEqual(tag.get_buffer_as_string(), b'\x88\xa8\x53\x6c')
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def test_05(self):
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"""Test manipulation with VLAN tags"""
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def check_tags(*tags):
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self.assertEqual(self.eth.tag_cnt, len(tags))
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self.assertEqual(self.eth.get_header_size(), 14 + 4*len(tags))
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self.assertEqual(self.eth.get_ether_type(), 0x0800)
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for i,tag in enumerate(tags):
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self.assertEqual(self.eth.get_tag(i).get_buffer_as_string(), tag)
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# Add S-tag (outer tag, closest to the Ethernet header)
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self.eth.push_tag(EthernetTag(0x88a85001))
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check_tags(b'\x88\xa8\x50\x01', b'\x81\x00\xac\xf3')
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# Set C-tag (inner tag, closest to the payload) to default
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self.eth.set_tag(1, EthernetTag())
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check_tags(b'\x88\xa8\x50\x01', b'\x81\x00\x00\x00')
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# Insert a deprecated 802.1QinQ header between S-tag and C-tag
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self.eth.push_tag(EthernetTag(0x910054d2), index=1)
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check_tags(b'\x88\xa8\x50\x01', b'\x91\x00\x54\xd2', b'\x81\x00\x00\x00')
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# Test negative indices
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tags = {}
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for i in range(-3,3):
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tags[i] = self.eth.get_tag(i).get_buffer_as_string()
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self.assertEqual(tags[-1], tags[2])
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self.assertEqual(tags[-2], tags[1])
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self.assertEqual(tags[-3], tags[0])
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# Accessing non-existent tags raises IndexError
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self.assertRaises(IndexError, self.eth.get_tag, 3)
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self.assertRaises(IndexError, self.eth.get_tag, -4)
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self.assertRaises(IndexError, self.eth.set_tag, 3, EthernetTag())
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self.assertRaises(IndexError, self.eth.set_tag, -4, EthernetTag())
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# Test Ethernet constructor
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data = self.eth.get_buffer_as_string()
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eth_copy = Ethernet(data)
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self.assertEqual(eth_copy.tag_cnt, 3)
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self.assertEqual(eth_copy.get_header_size(), 26)
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self.assertEqual(eth_copy.get_ether_type(), 0x0800)
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# Remove the deprecated 802.1QinQ header and check resulting frame
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eth_copy.pop_tag(1)
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self.assertEqual(eth_copy.tag_cnt, 2)
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self.assertEqual(eth_copy.get_packet(), self.frame[:12] + tags[0] + tags[2] + self.frame[-2:])
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if __name__ == '__main__':
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unittest.main(verbosity=1)
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