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# Copyright 2014 Hewlett-Packard Development Company, L.P.
#
# Author: Kiall Mac Innes <kiall@hpe.com>
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import binascii
import errno
import socket
import struct
from unittest import mock
import dns
import dns.message
from oslo_log import log as logging
from designate.tests.test_mdns import MdnsTestCase
LOG = logging.getLogger(__name__)
def hex_wire(response):
return binascii.b2a_hex(response.to_wire())
class MdnsServiceTest(MdnsTestCase):
# DNS packet with IQUERY opcode
query_payload = binascii.a2b_hex(
"271209000001000000000000076578616d706c6503636f6d0000010001"
)
expected_response = binascii.a2b_hex(
b"271289050001000000000000076578616d706c6503636f6d0000010001"
)
# expected response is an error code REFUSED. The other fields are
# id 10002
# opcode IQUERY
# rcode REFUSED
# flags QR RD
# ;QUESTION
# example.com. IN A
# ;ANSWER
# ;AUTHORITY
# ;ADDITIONAL
# Use self._print_dns_msg() to display the messages
def setUp(self):
super(MdnsServiceTest, self).setUp()
self.config(listen=['0.0.0.0:0'], group='service:mdns')
self.service = self.start_service('mdns')
self.dns_service = self.service.dns_service
self.addr = ['0.0.0.0', 5556]
@staticmethod
def _print_dns_msg(desc, wire):
"""Print DNS message for debugging"""
q = dns.message.from_wire(wire).to_text()
print("%s:\n%s\n" % (desc, q))
def test_stop(self):
# NOTE: Start is already done by the fixture in start_service()
self.service.stop()
@mock.patch.object(dns.message, 'make_query')
def test_handle_empty_payload(self, query_mock):
mock_socket = mock.Mock()
self.dns_service._dns_handle_udp_query(mock_socket, self.addr,
' '.encode('utf-8'))
query_mock.assert_called_once_with('unknown', dns.rdatatype.A)
def test_handle_udp_payload(self):
mock_socket = mock.Mock()
self.dns_service._dns_handle_udp_query(mock_socket, self.addr,
self.query_payload)
mock_socket.sendto.assert_called_once_with(self.expected_response,
self.addr)
def test__dns_handle_tcp_conn_fail_unpack(self):
# will call recv() only once
mock_socket = mock.Mock()
mock_socket.recv.side_effect = ['X', 'boo'] # X will fail unpack
self.dns_service._dns_handle_tcp_conn(('1.2.3.4', 42), mock_socket)
self.assertEqual(1, mock_socket.recv.call_count)
self.assertEqual(1, mock_socket.close.call_count)
def test__dns_handle_tcp_conn_one_query(self):
payload = self.query_payload
mock_socket = mock.Mock()
pay_len = struct.pack("!H", len(payload))
mock_socket.recv.side_effect = [pay_len, payload, socket.timeout]
self.dns_service._dns_handle_tcp_conn(('1.2.3.4', 42), mock_socket)
self.assertEqual(3, mock_socket.recv.call_count)
self.assertEqual(1, mock_socket.sendall.call_count)
self.assertEqual(1, mock_socket.close.call_count)
wire = mock_socket.sendall.call_args[0][0]
expected_length_raw = wire[:2]
(expected_length,) = struct.unpack('!H', expected_length_raw)
self.assertEqual(len(wire), expected_length + 2)
self.assertEqual(self.expected_response, wire[2:])
def test__dns_handle_tcp_conn_multiple_queries(self):
payload = self.query_payload
mock_socket = mock.Mock()
pay_len = struct.pack("!H", len(payload))
# Process 5 queries, then receive a misaligned query and close the
# connection there
mock_socket.recv.side_effect = [
pay_len, payload,
pay_len, payload,
pay_len, payload,
pay_len, payload,
pay_len, payload,
'X', payload,
pay_len, payload,
pay_len, payload,
]
self.dns_service._dns_handle_tcp_conn(('1.2.3.4', 42), mock_socket)
self.assertEqual(11, mock_socket.recv.call_count)
self.assertEqual(5, mock_socket.sendall.call_count)
self.assertEqual(1, mock_socket.close.call_count)
def test__dns_handle_tcp_conn_multiple_queries_socket_error(self):
payload = self.query_payload
mock_socket = mock.Mock()
pay_len = struct.pack("!H", len(payload))
# Process 5 queries, then receive a socket error and close the
# connection there
mock_socket.recv.side_effect = [
pay_len, payload,
pay_len, payload,
pay_len, payload,
pay_len, payload,
pay_len, payload,
socket.error(errno.EAGAIN),
pay_len, payload,
pay_len, payload,
]
self.dns_service._dns_handle_tcp_conn(('1.2.3.4', 42), mock_socket)
self.assertEqual(11, mock_socket.recv.call_count)
self.assertEqual(5, mock_socket.sendall.call_count)
self.assertEqual(1, mock_socket.close.call_count)
def test__dns_handle_tcp_conn_multiple_queries_ignore_bad_query(self):
payload = self.query_payload
mock_socket = mock.Mock()
pay_len = struct.pack("!H", len(payload))
# Ignore a broken query and keep going as long as the query len
# header was correct
mock_socket.recv.side_effect = [
pay_len, payload,
pay_len, payload[:-5] + b'hello',
pay_len, payload,
pay_len, payload,
pay_len, payload,
]
self.dns_service._dns_handle_tcp_conn(('1.2.3.4', 42), mock_socket)
self.assertEqual(11, mock_socket.recv.call_count)
self.assertEqual(4, mock_socket.sendall.call_count)
self.assertEqual(1, mock_socket.close.call_count)
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