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# Copyright (C) 2012 Nippon Telegraph and Telephone Corporation.
#
# 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.
# vim: tabstop=4 shiftwidth=4 softtabstop=4
import unittest
import logging
import struct
from struct import *
from os_ken.ofproto import ether, inet
from os_ken.lib.packet.packet import Packet
from os_ken.lib.packet.udp import udp
from os_ken.lib.packet.ipv4 import ipv4
from os_ken.lib.packet import packet_utils
from os_ken.lib import addrconv
LOG = logging.getLogger('test_udp')
class Test_udp(unittest.TestCase):
""" Test case for udp
"""
src_port = 6431
dst_port = 8080
total_length = 65507
csum = 12345
u = udp(src_port, dst_port, total_length, csum)
buf = pack(udp._PACK_STR, src_port, dst_port, total_length, csum)
def setUp(self):
pass
def tearDown(self):
pass
def test_init(self):
self.assertEqual(self.src_port, self.u.src_port)
self.assertEqual(self.dst_port, self.u.dst_port)
self.assertEqual(self.total_length, self.u.total_length)
self.assertEqual(self.csum, self.u.csum)
def test_parser(self):
r1, r2, _ = self.u.parser(self.buf)
self.assertEqual(self.src_port, r1.src_port)
self.assertEqual(self.dst_port, r1.dst_port)
self.assertEqual(self.total_length, r1.total_length)
self.assertEqual(self.csum, r1.csum)
self.assertEqual(None, r2)
def test_serialize(self):
src_port = 6431
dst_port = 8080
total_length = 0
csum = 0
src_ip = '192.168.10.1'
dst_ip = '192.168.100.1'
prev = ipv4(4, 5, 0, 0, 0, 0, 0, 64,
inet.IPPROTO_UDP, 0, src_ip, dst_ip)
u = udp(src_port, dst_port, total_length, csum)
buf = u.serialize(bytearray(), prev)
res = struct.unpack(udp._PACK_STR, buf)
self.assertEqual(res[0], src_port)
self.assertEqual(res[1], dst_port)
self.assertEqual(res[2], struct.calcsize(udp._PACK_STR))
# checksum
ph = struct.pack('!4s4sBBH',
addrconv.ipv4.text_to_bin(src_ip),
addrconv.ipv4.text_to_bin(dst_ip), 0, 17, res[2])
d = ph + buf + bytearray()
s = packet_utils.checksum(d)
self.assertEqual(0, s)
def test_malformed_udp(self):
m_short_buf = self.buf[1:udp._MIN_LEN]
self.assertRaises(Exception, udp.parser, m_short_buf)
def test_default_args(self):
prev = ipv4(proto=inet.IPPROTO_UDP)
u = udp()
buf = u.serialize(bytearray(), prev)
res = struct.unpack(udp._PACK_STR, buf)
self.assertEqual(res[0], 1)
self.assertEqual(res[1], 1)
self.assertEqual(res[2], udp._MIN_LEN)
def test_json(self):
jsondict = self.u.to_jsondict()
u = udp.from_jsondict(jsondict['udp'])
self.assertEqual(str(self.u), str(u))
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