1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
#!/usr/bin/env python3
""" CDP tests """
from scapy.packet import Packet
from scapy.all import ShortField, StrField
from scapy.layers.l2 import Dot3, LLC, SNAP
from scapy.contrib.cdp import CDPMsgDeviceID, CDPMsgSoftwareVersion, \
CDPMsgPlatform, CDPMsgPortID, CDPv2_HDR
from framework import VppTestCase
from scapy.all import raw
from re import compile
from time import sleep
from util import ppp
import platform
import sys
import unittest
""" TestCDP is a subclass of VPPTestCase classes.
CDP test.
"""
class CustomTLV(Packet):
""" Custom TLV protocol layer for scapy """
fields_desc = [
ShortField("type", 0),
ShortField("length", 4),
StrField("value", "")
]
class TestCDP(VppTestCase):
""" CDP Test Case """
nen_ptr = compile(r"not enabled")
cdp_ptr = compile(r"^([-\.\w]+)\s+([-\.\w]+)\s+([-\.\w]+)\s+([-\.\w]+)$")
err_ptr = compile(r"^([\d]+)\s+([-\w]+)\s+([ -\.\w)(]+)$")
@property
def device_id(self):
return platform.node()
@property
def version(self):
return platform.release()
@property
def port_id(self):
return self.interface.name
@property
def platform(self):
return platform.system()
@classmethod
def setUpClass(cls):
super(TestCDP, cls).setUpClass()
try:
cls.create_pg_interfaces(range(1))
cls.interface = cls.pg_interfaces[0]
cls.interface.admin_up()
cls.interface.config_ip4()
cls.interface.resolve_arp()
except Exception:
super(TestCDP, cls).tearDownClass()
raise
@classmethod
def tearDownClass(cls):
super(TestCDP, cls).tearDownClass()
def test_enable_cdp(self):
self.logger.info(self.vapi.cdp_enable_disable(enable_disable=1))
ret = self.vapi.cli("show cdp")
self.logger.info(ret)
not_enabled = self.nen_ptr.search(ret)
self.assertFalse(not_enabled, "CDP isn't enabled")
def test_send_cdp_packet(self):
self.logger.info(self.vapi.cdp_enable_disable(enable_disable=1))
self.send_packet(self.create_packet())
neighbors = list(self.show_cdp())
self.assertTrue(neighbors, "CDP didn't register neighbor")
port, system = neighbors[0]
length = min(len(system), len(self.device_id))
self.assert_equal(port, self.port_id, "CDP received invalid port id")
self.assert_equal(system[:length], self.device_id[:length],
"CDP received invalid device id")
def test_cdp_underflow_tlv(self):
self.send_bad_packet(3, ".")
def test_cdp_overflow_tlv(self):
self.send_bad_packet(8, ".")
def send_bad_packet(self, l, v):
self.logger.info(self.vapi.cdp_enable_disable(enable_disable=1))
self.send_packet(self.create_bad_packet(l, v))
errors = list(self.show_errors())
self.assertTrue(errors)
expected_errors = False
for count, node, reason in errors:
if (node == u'cdp-input' and
reason == u'cdp packets with bad TLVs' and
int(count) >= 1):
expected_errors = True
break
self.assertTrue(expected_errors, "CDP didn't drop bad packet")
def send_packet(self, packet):
self.logger.debug(ppp("Sending packet:", packet))
self.interface.add_stream(packet)
self.pg_start()
def create_base_packet(self):
packet = (Dot3(src=self.interface.remote_mac,
dst="01:00:0c:cc:cc:cc") /
LLC(dsap=0xaa, ssap=0xaa, ctrl=0x03) /
SNAP()/CDPv2_HDR())
return packet
def create_packet(self):
packet = (self.create_base_packet() /
CDPMsgDeviceID(val=self.device_id) /
CDPMsgSoftwareVersion(val=self.version) /
CDPMsgPortID(iface=self.port_id) /
CDPMsgPlatform(val=self.platform))
return packet
def create_bad_packet(self, tl=4, tv=""):
packet = (self.create_base_packet() /
CustomTLV(type=1,
length=tl,
value=tv))
return packet
def process_cli(self, exp, ptr):
for line in self.vapi.cli(exp).split('\n')[1:]:
m = ptr.match(line.strip())
if m:
yield m.groups()
def show_cdp(self):
for pack in self.process_cli("show cdp", self.cdp_ptr):
try:
port, system, _, _ = pack
except ValueError:
pass
else:
yield port, system
def show_errors(self):
for pack in self.process_cli("show errors", self.err_ptr):
try:
count, node, reason = pack
except ValueError:
pass
else:
yield count, node, reason
|
