5 from framework import VppTestCase
6 from asfframework import VppTestRunner
7 from ipaddress import *
9 from scapy.layers.inet import IP, UDP
10 from scapy.layers.l2 import Ether
11 from scapy.layers.dns import DNS, DNSQR
14 class TestDns(VppTestCase):
19 super(TestDns, cls).setUpClass()
22 def tearDownClass(cls):
23 super(TestDns, cls).tearDownClass()
26 super(TestDns, self).setUp()
28 self.create_pg_interfaces(range(1))
30 for i in self.pg_interfaces:
36 super(TestDns, self).tearDown()
38 def create_stream(self, src_if):
39 """Create input packet stream for defined interface.
41 :param VppInterface src_if: Interface to create packet stream for.
44 Ether(dst=src_if.local_mac, src=src_if.remote_mac)
45 / IP(src=src_if.remote_ip4)
46 / UDP(sport=1234, dport=53)
47 / DNS(rd=1, qd=DNSQR(qname="bozo.clown.org"))
51 Ether(dst=src_if.local_mac, src=src_if.remote_mac)
52 / IP(src=src_if.remote_ip4)
53 / UDP(sport=1234, dport=53)
54 / DNS(rd=1, qd=DNSQR(qname="no.clown.org"))
56 pkts = [good_request, bad_request]
59 def verify_capture(self, dst_if, capture):
60 """Verify captured input packet stream for defined interface.
62 :param VppInterface dst_if: Interface to verify captured packet stream
64 :param list capture: Captured packet stream.
66 self.logger.info("Verifying capture on interface %s" % dst_if.name)
67 for packet in capture:
69 self.assertEqual(dns.an[0].rdata, "1.2.3.4")
71 def test_dns_unittest(self):
72 """DNS Name Resolver Basic Functional Test"""
74 # Set up an upstream name resolver. We won't actually go there
75 self.vapi.dns_name_server_add_del(
76 is_ip6=0, is_add=1, server_address=IPv4Address("8.8.8.8").packed
79 # Enable name resolution
80 self.vapi.dns_enable_disable(enable=1)
82 # Manually add a static dns cache entry
83 self.logger.info(self.vapi.cli("dns cache add bozo.clown.org 1.2.3.4"))
86 rv = self.vapi.dns_resolve_name(name=b"bozo.clown.org")
87 self.assertEqual(rv.ip4_address, IPv4Address("1.2.3.4").packed)
89 # Configure 127.0.0.1/8 on the pg interface
90 self.vapi.sw_interface_add_del_address(
91 sw_if_index=self.pg0.sw_if_index, prefix="127.0.0.1/8"
94 # Send a couple of DNS request packets, one for bozo.clown.org
95 # and one for no.clown.org which won't resolve
97 pkts = self.create_stream(self.pg0)
98 self.pg0.add_stream(pkts)
99 self.pg_enable_capture(self.pg_interfaces)
102 pkts = self.pg0.get_capture(1)
103 self.verify_capture(self.pg0, pkts)
105 # Make sure that the cache contents are correct
106 str = self.vapi.cli("show dns cache verbose")
107 self.assertIn("1.2.3.4", str)
108 self.assertIn("[P] no.clown.org:", str)
111 if __name__ == "__main__":
112 unittest.main(testRunner=VppTestRunner)