--- /dev/null
+# Copyright (C) 2012-2015 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 six
+import struct
+from struct import *
+from nose.tools import *
+from ryu.ofproto import inet
+from ryu.lib.packet import tcp
+from ryu.lib.packet.ipv4 import ipv4
+from ryu.lib.packet import packet_utils
+from ryu.lib import addrconv
+
+
+LOG = logging.getLogger('test_tcp')
+
+
+class Test_tcp(unittest.TestCase):
+ """ Test case for tcp
+ """
+ src_port = 6431
+ dst_port = 8080
+ seq = 5
+ ack = 1
+ offset = 6
+ bits = 0b101010
+ window_size = 2048
+ csum = 12345
+ urgent = 128
+ option = b'\x01\x02\x03\x04'
+
+ t = tcp.tcp(src_port, dst_port, seq, ack, offset, bits,
+ window_size, csum, urgent, option)
+
+ buf = pack(tcp.tcp._PACK_STR, src_port, dst_port, seq, ack,
+ offset << 4, bits, window_size, csum, urgent)
+ buf += option
+
+ def setUp(self):
+ pass
+
+ def tearDown(self):
+ pass
+
+ def test_init(self):
+ eq_(self.src_port, self.t.src_port)
+ eq_(self.dst_port, self.t.dst_port)
+ eq_(self.seq, self.t.seq)
+ eq_(self.ack, self.t.ack)
+ eq_(self.offset, self.t.offset)
+ eq_(self.bits, self.t.bits)
+ eq_(self.window_size, self.t.window_size)
+ eq_(self.csum, self.t.csum)
+ eq_(self.urgent, self.t.urgent)
+ eq_(self.option, self.t.option)
+
+ def test_parser(self):
+ r1, r2, _ = self.t.parser(self.buf)
+
+ eq_(self.src_port, r1.src_port)
+ eq_(self.dst_port, r1.dst_port)
+ eq_(self.seq, r1.seq)
+ eq_(self.ack, r1.ack)
+ eq_(self.offset, r1.offset)
+ eq_(self.bits, r1.bits)
+ eq_(self.window_size, r1.window_size)
+ eq_(self.csum, r1.csum)
+ eq_(self.urgent, r1.urgent)
+ eq_(self.option, r1.option)
+ eq_(None, r2)
+
+ def test_serialize(self):
+ offset = 5
+ 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_TCP, 0, src_ip, dst_ip)
+
+ t = tcp.tcp(self.src_port, self.dst_port, self.seq, self.ack,
+ offset, self.bits, self.window_size, csum, self.urgent)
+ buf = t.serialize(bytearray(), prev)
+ res = struct.unpack(tcp.tcp._PACK_STR, six.binary_type(buf))
+
+ eq_(res[0], self.src_port)
+ eq_(res[1], self.dst_port)
+ eq_(res[2], self.seq)
+ eq_(res[3], self.ack)
+ eq_(res[4], offset << 4)
+ eq_(res[5], self.bits)
+ eq_(res[6], self.window_size)
+ eq_(res[8], self.urgent)
+
+ # test __len__
+ # offset indicates the number of 32 bit (= 4 bytes)
+ # words in the TCP Header.
+ # So, we compare len(tcp) with offset * 4, here.
+ eq_(offset * 4, len(t))
+
+ # checksum
+ ph = struct.pack('!4s4sBBH',
+ addrconv.ipv4.text_to_bin(src_ip),
+ addrconv.ipv4.text_to_bin(dst_ip), 0, 6, offset * 4)
+ d = ph + buf
+ s = packet_utils.checksum(d)
+ eq_(0, s)
+
+ def test_serialize_option(self):
+ # prepare test data
+ offset = 0
+ csum = 0
+ option = [
+ tcp.TCPOptionMaximumSegmentSize(max_seg_size=1460),
+ tcp.TCPOptionSACKPermitted(),
+ tcp.TCPOptionTimestamps(ts_val=287454020, ts_ecr=1432778632),
+ tcp.TCPOptionNoOperation(),
+ tcp.TCPOptionWindowScale(shift_cnt=9),
+ ]
+ option_buf = (
+ b'\x02\x04\x05\xb4'
+ b'\x04\x02'
+ b'\x08\x0a\x11\x22\x33\x44\x55\x66\x77\x88'
+ b'\x01'
+ b'\x03\x03\x09'
+ )
+ prev = ipv4(4, 5, 0, 0, 0, 0, 0, 64,
+ inet.IPPROTO_TCP, 0, '192.168.10.1', '192.168.100.1')
+
+ # test serializer
+ t = tcp.tcp(self.src_port, self.dst_port, self.seq, self.ack,
+ offset, self.bits, self.window_size, csum, self.urgent,
+ option)
+ buf = t.serialize(bytearray(), prev)
+ r_option_buf = buf[tcp.tcp._MIN_LEN:tcp.tcp._MIN_LEN + len(option_buf)]
+ eq_(option_buf, r_option_buf)
+
+ # test parser
+ (r_tcp, _, _) = tcp.tcp.parser(buf)
+ eq_(str(option), str(r_tcp.option))
+
+ @raises(Exception)
+ def test_malformed_tcp(self):
+ m_short_buf = self.buf[1:tcp.tcp._MIN_LEN]
+ tcp.tcp.parser(m_short_buf)
+
+ def test_default_args(self):
+ prev = ipv4(proto=inet.IPPROTO_TCP)
+ t = tcp.tcp()
+ buf = t.serialize(bytearray(), prev)
+ res = struct.unpack(tcp.tcp._PACK_STR, buf)
+
+ eq_(res[0], 1)
+ eq_(res[1], 1)
+ eq_(res[2], 0)
+ eq_(res[3], 0)
+ eq_(res[4], 5 << 4)
+ eq_(res[5], 0)
+ eq_(res[6], 0)
+ eq_(res[8], 0)
+
+ # with option, without offset
+ t = tcp.tcp(option=[tcp.TCPOptionMaximumSegmentSize(1460)])
+ buf = t.serialize(bytearray(), prev)
+ res = struct.unpack(tcp.tcp._PACK_STR + '4s', buf)
+
+ eq_(res[0], 1)
+ eq_(res[1], 1)
+ eq_(res[2], 0)
+ eq_(res[3], 0)
+ eq_(res[4], 6 << 4)
+ eq_(res[5], 0)
+ eq_(res[6], 0)
+ eq_(res[8], 0)
+ eq_(res[9], b'\x02\x04\x05\xb4')
+
+ # with option, with long offset
+ t = tcp.tcp(offset=7, option=[tcp.TCPOptionWindowScale(shift_cnt=9)])
+ buf = t.serialize(bytearray(), prev)
+ res = struct.unpack(tcp.tcp._PACK_STR + '8s', buf)
+
+ eq_(res[0], 1)
+ eq_(res[1], 1)
+ eq_(res[2], 0)
+ eq_(res[3], 0)
+ eq_(res[4], 7 << 4)
+ eq_(res[5], 0)
+ eq_(res[6], 0)
+ eq_(res[8], 0)
+ eq_(res[9], b'\x03\x03\x09\x00\x00\x00\x00\x00')
+
+ def test_json(self):
+ jsondict = self.t.to_jsondict()
+ t = tcp.tcp.from_jsondict(jsondict['tcp'])
+ eq_(str(self.t), str(t))
+
+
+class Test_TCPOption(unittest.TestCase):
+ # prepare test data
+ input_options = [
+ tcp.TCPOptionEndOfOptionList(),
+ tcp.TCPOptionNoOperation(),
+ tcp.TCPOptionMaximumSegmentSize(max_seg_size=1460),
+ tcp.TCPOptionWindowScale(shift_cnt=9),
+ tcp.TCPOptionSACKPermitted(),
+ tcp.TCPOptionSACK(blocks=[(1, 2), (3, 4)], length=18),
+ tcp.TCPOptionTimestamps(ts_val=287454020, ts_ecr=1432778632),
+ tcp.TCPOptionUserTimeout(granularity=1, user_timeout=564),
+ tcp.TCPOptionAuthentication(
+ key_id=1, r_next_key_id=2,
+ mac=b'abcdefghijkl', length=16),
+ tcp.TCPOptionUnknown(value=b'foobar', kind=255, length=8),
+ tcp.TCPOptionUnknown(value=b'', kind=255, length=2),
+ ]
+ input_buf = (
+ b'\x00' # End of Option List
+ b'\x01' # No-Operation
+ b'\x02\x04\x05\xb4' # Maximum Segment Size
+ b'\x03\x03\x09' # Window Scale
+ b'\x04\x02' # SACK Permitted
+ b'\x05\x12' # SACK
+ b'\x00\x00\x00\x01\x00\x00\x00\x02\x00\x00\x00\x03\x00\x00\x00\x04'
+ b'\x08\x0a' # Timestamps
+ b'\x11\x22\x33\x44\x55\x66\x77\x88'
+ b'\x1c\x04\x82\x34' # User Timeout Option
+ b'\x1d\x10\x01\x02' # TCP Authentication Option (TCP-AO)
+ b'abcdefghijkl'
+ b'\xff\x08' # Unknown with body
+ b'foobar'
+ b'\xff\x02' # Unknown
+ )
+
+ def test_serialize(self):
+ output_buf = bytearray()
+ for option in self.input_options:
+ output_buf += option.serialize()
+ eq_(self.input_buf, output_buf)
+
+ def test_parser(self):
+ buf = self.input_buf
+ output_options = []
+ while buf:
+ opt, buf = tcp.TCPOption.parser(buf)
+ output_options.append(opt)
+ eq_(str(self.input_options), str(output_options))
+
+ def test_json(self):
+ for option in self.input_options:
+ json_dict = option.to_jsondict()[option.__class__.__name__]
+ output_option = option.__class__.from_jsondict(json_dict)
+ eq_(str(option), str(output_option))
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