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#!/usr/bin/env python
import unittest
import socket
from framework import VppTestCase, VppTestRunner
from ipaddress import *
import scapy.compat
from scapy.contrib.mpls import MPLS
from scapy.layers.inet import IP, UDP, TCP, ICMP, icmptypes, icmpcodes
from scapy.layers.l2 import Ether
from scapy.packet import Raw
from scapy.layers.dns import DNSRR, DNS, DNSQR
class TestDns(VppTestCase):
""" Dns Test Cases """
@classmethod
def setUpClass(cls):
super(TestDns, cls).setUpClass()
@classmethod
def tearDownClass(cls):
super(TestDns, cls).tearDownClass()
def setUp(self):
super(TestDns, self).setUp()
self.create_pg_interfaces(range(1))
for i in self.pg_interfaces:
i.admin_up()
i.config_ip4()
i.resolve_arp()
def tearDown(self):
super(TestDns, self).tearDown()
def create_stream(self, src_if):
"""Create input packet stream for defined interface.
:param VppInterface src_if: Interface to create packet stream for.
"""
good_request = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
IP(src=src_if.remote_ip4) /
UDP(sport=1234, dport=53) /
DNS(rd=1, qd=DNSQR(qname="bozo.clown.org")))
bad_request = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
IP(src=src_if.remote_ip4) /
UDP(sport=1234, dport=53) /
DNS(rd=1, qd=DNSQR(qname="no.clown.org")))
pkts = [good_request, bad_request]
return pkts
def verify_capture(self, dst_if, capture):
"""Verify captured input packet stream for defined interface.
:param VppInterface dst_if: Interface to verify captured packet stream
for.
:param list capture: Captured packet stream.
"""
self.logger.info("Verifying capture on interface %s" % dst_if.name)
for packet in capture:
dns = packet[DNS]
self.assertEqual(dns.an[0].rdata, '1.2.3.4')
def test_dns_unittest(self):
""" DNS Name Resolver Basic Functional Test """
# Set up an upstream name resolver. We won't actually go there
self.vapi.dns_name_server_add_del(
is_ip6=0, is_add=1, server_address=IPv4Address(u'8.8.8.8').packed)
# Enable name resolution
self.vapi.dns_enable_disable(enable=1)
# Manually add a static dns cache entry
self.logger.info(self.vapi.cli("dns cache add bozo.clown.org 1.2.3.4"))
# Test the binary API
rv = self.vapi.dns_resolve_name(name='bozo.clown.org')
self.assertEqual(rv.ip4_address, IPv4Address(u'1.2.3.4').packed)
# Configure 127.0.0.1/8 on the pg interface
ip_addr_n = socket.inet_pton(socket.AF_INET, "127.0.0.1")
self.vapi.sw_interface_add_del_address(
sw_if_index=self.pg0.sw_if_index,
address=ip_addr_n, address_length=8)
# Send a couple of DNS request packets, one for bozo.clown.org
# and one for no.clown.org which won't resolve
pkts = self.create_stream(self.pg0)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
pkts = self.pg0.get_capture(1)
self.verify_capture(self.pg0, pkts)
# Make sure that the cache contents are correct
str = self.vapi.cli("show dns cache verbose")
self.assertIn('1.2.3.4', str)
self.assertIn('[P] no.clown.org:', str)
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)
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