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]
89 length = min(len(system), len(self.device_id))
91 self.assert_equal(port, self.port_id, "CDP received invalid port id")
92 self.assert_equal(system[:length], self.device_id[:length],
93 "CDP received invalid device id")
95 def test_cdp_underflow_tlv(self):
96 self.send_bad_packet(3, ".")
98 def test_cdp_overflow_tlv(self):
99 self.send_bad_packet(8, ".")
101 def send_bad_packet(self, l, v):
102 self.logger.info(self.vapi.cli("cdp enable"))
103 self.send_packet(self.create_bad_packet(l, v))
105 errors = list(self.show_errors())
106 self.assertTrue(errors)
108 expected_errors = False
109 for count, node, reason in errors:
110 if (node == u'cdp-input' and
111 reason == u'cdp packets with bad TLVs' and
114 expected_errors = True
116 self.assertTrue(expected_errors, "CDP didn't drop bad packet")
118 def send_packet(self, packet):
119 self.logger.debug(ppp("Sending packet:", packet))
120 self.interface.add_stream(packet)
123 def create_base_packet(self):
124 packet = (Dot3(src=self.interface.remote_mac,
125 dst="01:00:0c:cc:cc:cc") /
126 LLC(dsap=0xaa, ssap=0xaa, ctrl=0x03) /
130 def create_packet(self):
131 packet = (self.create_base_packet() /
132 CDPMsgDeviceID(val=self.device_id) /
133 CDPMsgSoftwareVersion(val=self.version) /
134 CDPMsgPortID(iface=self.port_id) /
135 CDPMsgPlatform(val=self.platform))
138 def create_bad_packet(self, tl=4, tv=""):
139 packet = (self.create_base_packet() /
145 def process_cli(self, exp, ptr):
146 for line in self.vapi.cli(exp).split('\n')[1:]:
147 m = ptr.match(line.strip())
152 for pack in self.process_cli("show cdp", self.cdp_ptr):
154 port, system, _, _ = pack
160 def show_errors(self):
161 for pack in self.process_cli("show errors", self.err_ptr):
163 count, node, reason = pack
167 yield count, node, reason