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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.
import unittest
import logging
import struct
from struct import *
from os_ken.ofproto import inet
from os_ken.lib.packet import packet_utils
from os_ken.lib.packet.ipv4 import ipv4
from os_ken.lib.packet.tcp import tcp
from os_ken.lib import addrconv
LOG = logging.getLogger('test_ipv4')
class Test_ipv4(unittest.TestCase):
""" Test case for ipv4
"""
version = 4
header_length = 5 + 10
ver_hlen = version << 4 | header_length
tos = 0
total_length = header_length + 64
identification = 30774
flags = 4
offset = 1480
flg_off = flags << 13 | offset
ttl = 64
proto = inet.IPPROTO_TCP
csum = 0xadc6
src = '131.151.32.21'
dst = '131.151.32.129'
length = header_length * 4
option = b'\x86\x28\x00\x00\x00\x01\x01\x22' \
+ b'\x00\x01\xae\x00\x00\x00\x00\x00' \
+ b'\x00\x00\x00\x00\x00\x00\x00\x00' \
+ b'\x00\x00\x00\x00\x00\x00\x00\x00' \
+ b'\x00\x00\x00\x00\x00\x00\x00\x01'
buf = pack(ipv4._PACK_STR, ver_hlen, tos, total_length, identification,
flg_off, ttl, proto, csum,
addrconv.ipv4.text_to_bin(src),
addrconv.ipv4.text_to_bin(dst)) \
+ option
ip = ipv4(version, header_length, tos, total_length, identification,
flags, offset, ttl, proto, csum, src, dst, option)
def setUp(self):
pass
def tearDown(self):
pass
def test_init(self):
self.assertEqual(self.version, self.ip.version)
self.assertEqual(self.header_length, self.ip.header_length)
self.assertEqual(self.tos, self.ip.tos)
self.assertEqual(self.total_length, self.ip.total_length)
self.assertEqual(self.identification, self.ip.identification)
self.assertEqual(self.flags, self.ip.flags)
self.assertEqual(self.offset, self.ip.offset)
self.assertEqual(self.ttl, self.ip.ttl)
self.assertEqual(self.proto, self.ip.proto)
self.assertEqual(self.csum, self.ip.csum)
self.assertEqual(self.src, self.ip.src)
self.assertEqual(self.dst, self.ip.dst)
self.assertEqual(self.length, len(self.ip))
self.assertEqual(self.option, self.ip.option)
def test_parser(self):
res, ptype, _ = self.ip.parser(self.buf)
self.assertEqual(res.version, self.version)
self.assertEqual(res.header_length, self.header_length)
self.assertEqual(res.tos, self.tos)
self.assertEqual(res.total_length, self.total_length)
self.assertEqual(res.identification, self.identification)
self.assertEqual(res.flags, self.flags)
self.assertEqual(res.offset, self.offset)
self.assertEqual(res.ttl, self.ttl)
self.assertEqual(res.proto, self.proto)
self.assertEqual(res.csum, self.csum)
self.assertEqual(res.src, self.src)
self.assertEqual(res.dst, self.dst)
self.assertEqual(ptype, tcp)
def test_serialize(self):
buf = self.ip.serialize(bytearray(), None)
res = struct.unpack_from(ipv4._PACK_STR, bytes(buf))
option = buf[ipv4._MIN_LEN:ipv4._MIN_LEN + len(self.option)]
self.assertEqual(res[0], self.ver_hlen)
self.assertEqual(res[1], self.tos)
self.assertEqual(res[2], self.total_length)
self.assertEqual(res[3], self.identification)
self.assertEqual(res[4], self.flg_off)
self.assertEqual(res[5], self.ttl)
self.assertEqual(res[6], self.proto)
self.assertEqual(res[8], addrconv.ipv4.text_to_bin(self.src))
self.assertEqual(res[9], addrconv.ipv4.text_to_bin(self.dst))
self.assertEqual(option, self.option)
# checksum
csum = packet_utils.checksum(buf)
self.assertEqual(csum, 0)
def test_malformed_ipv4(self):
m_short_buf = self.buf[1:ipv4._MIN_LEN]
self.assertRaises(Exception, ipv4.parser, m_short_buf)
def test_json(self):
jsondict = self.ip.to_jsondict()
ip = ipv4.from_jsondict(jsondict['ipv4'])
self.assertEqual(str(self.ip), str(ip))
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