268 lines
8.4 KiB
Python
268 lines
8.4 KiB
Python
# Copyright (C) 2012-2015 Nippon Telegraph and Telephone Corporation.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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import unittest
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import logging
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import six
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import struct
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from struct import *
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from nose.tools import *
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from ryu.ofproto import inet
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from ryu.lib.packet import tcp
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from ryu.lib.packet.ipv4 import ipv4
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from ryu.lib.packet import packet_utils
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from ryu.lib import addrconv
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LOG = logging.getLogger('test_tcp')
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class Test_tcp(unittest.TestCase):
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""" Test case for tcp
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"""
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src_port = 6431
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dst_port = 8080
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seq = 5
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ack = 1
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offset = 6
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bits = 0b101010
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window_size = 2048
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csum = 12345
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urgent = 128
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option = b'\x01\x02\x03\x04'
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t = tcp.tcp(src_port, dst_port, seq, ack, offset, bits,
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window_size, csum, urgent, option)
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buf = pack(tcp.tcp._PACK_STR, src_port, dst_port, seq, ack,
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offset << 4, bits, window_size, csum, urgent)
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buf += option
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def setUp(self):
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pass
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def tearDown(self):
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pass
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def test_init(self):
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eq_(self.src_port, self.t.src_port)
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eq_(self.dst_port, self.t.dst_port)
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eq_(self.seq, self.t.seq)
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eq_(self.ack, self.t.ack)
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eq_(self.offset, self.t.offset)
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eq_(self.bits, self.t.bits)
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eq_(self.window_size, self.t.window_size)
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eq_(self.csum, self.t.csum)
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eq_(self.urgent, self.t.urgent)
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eq_(self.option, self.t.option)
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def test_parser(self):
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r1, r2, _ = self.t.parser(self.buf)
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eq_(self.src_port, r1.src_port)
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eq_(self.dst_port, r1.dst_port)
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eq_(self.seq, r1.seq)
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eq_(self.ack, r1.ack)
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eq_(self.offset, r1.offset)
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eq_(self.bits, r1.bits)
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eq_(self.window_size, r1.window_size)
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eq_(self.csum, r1.csum)
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eq_(self.urgent, r1.urgent)
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eq_(self.option, r1.option)
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eq_(None, r2)
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def test_serialize(self):
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offset = 5
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csum = 0
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src_ip = '192.168.10.1'
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dst_ip = '192.168.100.1'
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prev = ipv4(4, 5, 0, 0, 0, 0, 0, 64,
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inet.IPPROTO_TCP, 0, src_ip, dst_ip)
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t = tcp.tcp(self.src_port, self.dst_port, self.seq, self.ack,
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offset, self.bits, self.window_size, csum, self.urgent)
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buf = t.serialize(bytearray(), prev)
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res = struct.unpack(tcp.tcp._PACK_STR, six.binary_type(buf))
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eq_(res[0], self.src_port)
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eq_(res[1], self.dst_port)
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eq_(res[2], self.seq)
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eq_(res[3], self.ack)
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eq_(res[4], offset << 4)
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eq_(res[5], self.bits)
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eq_(res[6], self.window_size)
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eq_(res[8], self.urgent)
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# test __len__
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# offset indicates the number of 32 bit (= 4 bytes)
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# words in the TCP Header.
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# So, we compare len(tcp) with offset * 4, here.
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eq_(offset * 4, len(t))
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# checksum
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ph = struct.pack('!4s4sBBH',
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addrconv.ipv4.text_to_bin(src_ip),
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addrconv.ipv4.text_to_bin(dst_ip), 0, 6, offset * 4)
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d = ph + buf
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s = packet_utils.checksum(d)
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eq_(0, s)
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def test_serialize_option(self):
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# prepare test data
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offset = 0
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csum = 0
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option = [
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tcp.TCPOptionMaximumSegmentSize(max_seg_size=1460),
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tcp.TCPOptionSACKPermitted(),
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tcp.TCPOptionTimestamps(ts_val=287454020, ts_ecr=1432778632),
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tcp.TCPOptionNoOperation(),
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tcp.TCPOptionWindowScale(shift_cnt=9),
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]
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option_buf = (
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b'\x02\x04\x05\xb4'
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b'\x04\x02'
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b'\x08\x0a\x11\x22\x33\x44\x55\x66\x77\x88'
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b'\x01'
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b'\x03\x03\x09'
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)
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prev = ipv4(4, 5, 0, 0, 0, 0, 0, 64,
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inet.IPPROTO_TCP, 0, '192.168.10.1', '192.168.100.1')
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# test serializer
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t = tcp.tcp(self.src_port, self.dst_port, self.seq, self.ack,
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offset, self.bits, self.window_size, csum, self.urgent,
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option)
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buf = t.serialize(bytearray(), prev)
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r_option_buf = buf[tcp.tcp._MIN_LEN:tcp.tcp._MIN_LEN + len(option_buf)]
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eq_(option_buf, r_option_buf)
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# test parser
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(r_tcp, _, _) = tcp.tcp.parser(buf)
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eq_(str(option), str(r_tcp.option))
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@raises(Exception)
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def test_malformed_tcp(self):
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m_short_buf = self.buf[1:tcp.tcp._MIN_LEN]
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tcp.tcp.parser(m_short_buf)
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def test_default_args(self):
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prev = ipv4(proto=inet.IPPROTO_TCP)
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t = tcp.tcp()
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buf = t.serialize(bytearray(), prev)
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res = struct.unpack(tcp.tcp._PACK_STR, buf)
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eq_(res[0], 1)
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eq_(res[1], 1)
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eq_(res[2], 0)
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eq_(res[3], 0)
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eq_(res[4], 5 << 4)
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eq_(res[5], 0)
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eq_(res[6], 0)
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eq_(res[8], 0)
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# with option, without offset
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t = tcp.tcp(option=[tcp.TCPOptionMaximumSegmentSize(1460)])
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buf = t.serialize(bytearray(), prev)
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res = struct.unpack(tcp.tcp._PACK_STR + '4s', buf)
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eq_(res[0], 1)
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eq_(res[1], 1)
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eq_(res[2], 0)
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eq_(res[3], 0)
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eq_(res[4], 6 << 4)
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eq_(res[5], 0)
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eq_(res[6], 0)
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eq_(res[8], 0)
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eq_(res[9], b'\x02\x04\x05\xb4')
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# with option, with long offset
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t = tcp.tcp(offset=7, option=[tcp.TCPOptionWindowScale(shift_cnt=9)])
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buf = t.serialize(bytearray(), prev)
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res = struct.unpack(tcp.tcp._PACK_STR + '8s', buf)
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eq_(res[0], 1)
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eq_(res[1], 1)
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eq_(res[2], 0)
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eq_(res[3], 0)
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eq_(res[4], 7 << 4)
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eq_(res[5], 0)
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eq_(res[6], 0)
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eq_(res[8], 0)
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eq_(res[9], b'\x03\x03\x09\x00\x00\x00\x00\x00')
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def test_json(self):
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jsondict = self.t.to_jsondict()
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t = tcp.tcp.from_jsondict(jsondict['tcp'])
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eq_(str(self.t), str(t))
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class Test_TCPOption(unittest.TestCase):
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# prepare test data
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input_options = [
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tcp.TCPOptionEndOfOptionList(),
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tcp.TCPOptionNoOperation(),
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tcp.TCPOptionMaximumSegmentSize(max_seg_size=1460),
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tcp.TCPOptionWindowScale(shift_cnt=9),
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tcp.TCPOptionSACKPermitted(),
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tcp.TCPOptionSACK(blocks=[(1, 2), (3, 4)], length=18),
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tcp.TCPOptionTimestamps(ts_val=287454020, ts_ecr=1432778632),
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tcp.TCPOptionUserTimeout(granularity=1, user_timeout=564),
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tcp.TCPOptionAuthentication(
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key_id=1, r_next_key_id=2,
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mac=b'abcdefghijkl', length=16),
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tcp.TCPOptionUnknown(value=b'foobar', kind=255, length=8),
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tcp.TCPOptionUnknown(value=b'', kind=255, length=2),
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]
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input_buf = (
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b'\x00' # End of Option List
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b'\x01' # No-Operation
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b'\x02\x04\x05\xb4' # Maximum Segment Size
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b'\x03\x03\x09' # Window Scale
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b'\x04\x02' # SACK Permitted
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b'\x05\x12' # SACK
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b'\x00\x00\x00\x01\x00\x00\x00\x02\x00\x00\x00\x03\x00\x00\x00\x04'
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b'\x08\x0a' # Timestamps
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b'\x11\x22\x33\x44\x55\x66\x77\x88'
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b'\x1c\x04\x82\x34' # User Timeout Option
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b'\x1d\x10\x01\x02' # TCP Authentication Option (TCP-AO)
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b'abcdefghijkl'
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b'\xff\x08' # Unknown with body
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b'foobar'
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b'\xff\x02' # Unknown
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)
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def test_serialize(self):
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output_buf = bytearray()
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for option in self.input_options:
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output_buf += option.serialize()
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eq_(self.input_buf, output_buf)
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def test_parser(self):
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buf = self.input_buf
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output_options = []
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while buf:
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opt, buf = tcp.TCPOption.parser(buf)
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output_options.append(opt)
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eq_(str(self.input_options), str(output_options))
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def test_json(self):
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for option in self.input_options:
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json_dict = option.to_jsondict()[option.__class__.__name__]
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output_option = option.__class__.from_jsondict(json_dict)
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eq_(str(option), str(output_option))
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