4 from scapy.packet import Packet
5 from scapy.all import ShortField, StrField
6 from scapy.layers.l2 import Dot3, LLC, SNAP
7 from scapy.contrib.cdp import CDPMsgDeviceID, CDPMsgSoftwareVersion, \
8 CDPMsgPlatform, CDPMsgPortID, CDPv2_HDR
10 from framework import VppTestCase
11 from scapy.all import raw
12 from re import compile
13 from time import sleep
18 """ TestCDP is a subclass of VPPTestCase classes.
25 class CustomTLV(Packet):
26 """ Custom TLV protocol layer for scapy """
29 ShortField("type", 0),
30 ShortField("length", 4),
36 class TestCDP(VppTestCase):
39 nen_ptr = compile(r"not enabled")
40 cdp_ptr = compile(r"^([-\.\w]+)\s+([-\.\w]+)\s+([-\.\w]+)\s+([-\.\w]+)$")
41 err_ptr = compile(r"^([\d]+)\s+([-\w]+)\s+([ -\.\w)(]+)$")
45 return platform.node()
49 return platform.release()
53 return self.interface.name
57 return platform.system()
61 super(TestCDP, cls).setUpClass()
63 cls.create_pg_interfaces(range(1))
64 cls.interface = cls.pg_interfaces[0]
66 cls.interface.admin_up()
67 cls.interface.config_ip4()
68 cls.interface.resolve_arp()
71 super(TestCDP, cls).tearDownClass()
74 def test_enable_cdp(self):
75 self.logger.info(self.vapi.cli("cdp enable"))
76 ret = self.vapi.cli("show cdp")
78 not_enabled = self.nen_ptr.search(ret)
79 self.assertFalse(not_enabled, "CDP isn't enabled")
81 def test_send_cdp_packet(self):
82 self.logger.info(self.vapi.cli("cdp enable"))
83 self.send_packet(self.create_packet())
85 neighbors = list(self.show_cdp())
86 self.assertTrue(neighbors, "CDP didn't register neighbor")
88 port, system = neighbors[0]
90 self.assert_equal(port, self.port_id, "CDP received invalid port id")
91 self.assert_equal(system, self.device_id,
92 "CDP received invalid device id")
94 def test_cdp_underflow_tlv(self):
95 self.send_bad_packet(3, ".")
97 def test_cdp_overflow_tlv(self):
98 self.send_bad_packet(8, ".")
100 def send_bad_packet(self, l, v):
101 self.logger.info(self.vapi.cli("cdp enable"))
102 self.send_packet(self.create_bad_packet(l, v))
104 errors = list(self.show_errors())
105 self.assertTrue(errors)
107 expected_errors = False
108 for count, node, reason in errors:
109 if (node == u'cdp-input' and
110 reason == u'cdp packets with bad TLVs' and
113 expected_errors = True
115 self.assertTrue(expected_errors, "CDP didn't drop bad packet")
117 def send_packet(self, packet):
118 self.logger.debug(ppp("Sending packet:", packet))
119 self.interface.add_stream(packet)
122 def create_base_packet(self):
123 packet = (Dot3(src=self.interface.remote_mac,
124 dst="01:00:0c:cc:cc:cc") /
125 LLC(dsap=0xaa, ssap=0xaa, ctrl=0x03) /
129 def create_packet(self):
130 packet = (self.create_base_packet() /
131 CDPMsgDeviceID(val=self.device_id) /
132 CDPMsgSoftwareVersion(val=self.version) /
133 CDPMsgPortID(iface=self.port_id) /
134 CDPMsgPlatform(val=self.platform))
137 def create_bad_packet(self, tl=4, tv=""):
138 packet = (self.create_base_packet() /
144 def process_cli(self, exp, ptr):
145 for line in self.vapi.cli(exp).split('\n')[1:]:
146 m = ptr.match(line.strip())
151 for pack in self.process_cli("show cdp", self.cdp_ptr):
153 port, system, _, _ = pack
159 def show_errors(self):
160 for pack in self.process_cli("show errors", self.err_ptr):
162 count, node, reason = pack
166 yield count, node, reason