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1#!/usr/bin/python
2#
3# Copyright 2015 The Android Open Source Project
4#
5# Licensed under the Apache License, Version 2.0 (the "License");
6# you may not use this file except in compliance with the License.
7# You may obtain a copy of the License at
8#
9# http://www.apache.org/licenses/LICENSE-2.0
10#
11# Unless required by applicable law or agreed to in writing, software
12# distributed under the License is distributed on an "AS IS" BASIS,
13# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14# See the License for the specific language governing permissions and
15# limitations under the License.
16
17import time
18from socket import *  # pylint: disable=wildcard-import
19
20import net_test
21import multinetwork_base
22import packets
23
24# TCP states. See include/net/tcp_states.h.
25TCP_ESTABLISHED = 1
26TCP_SYN_SENT = 2
27TCP_SYN_RECV = 3
28TCP_FIN_WAIT1 = 4
29TCP_FIN_WAIT2 = 5
30TCP_TIME_WAIT = 6
31TCP_CLOSE = 7
32TCP_CLOSE_WAIT = 8
33TCP_LAST_ACK = 9
34TCP_LISTEN = 10
35TCP_CLOSING = 11
36TCP_NEW_SYN_RECV = 12
37
38TCP_NOT_YET_ACCEPTED = -1
39
40
41class TcpBaseTest(multinetwork_base.MultiNetworkBaseTest):
42
43  def tearDown(self):
44    if hasattr(self, "s"):
45      self.s.close()
46    super(TcpBaseTest, self).tearDown()
47
48  def OpenListenSocket(self, version, netid):
49    family = {4: AF_INET, 5: AF_INET6, 6: AF_INET6}[version]
50    address = {4: "0.0.0.0", 5: "::", 6: "::"}[version]
51    s = net_test.Socket(family, SOCK_STREAM, IPPROTO_TCP)
52    # We haven't configured inbound iptables marking, so bind explicitly.
53    self.SelectInterface(s, netid, "mark")
54    self.port = net_test.BindRandomPort(version, s)
55    return s
56
57  def _ReceiveAndExpectResponse(self, netid, packet, reply, msg):
58    pkt = super(TcpBaseTest, self)._ReceiveAndExpectResponse(netid, packet,
59                                                             reply, msg)
60    self.last_packet = pkt
61    return pkt
62
63  def ReceivePacketOn(self, netid, packet):
64    super(TcpBaseTest, self).ReceivePacketOn(netid, packet)
65    self.last_packet = packet
66
67  def ReceiveRstPacketOn(self, netid):
68    # self.last_packet is the last packet we received. Invert direction twice.
69    _, ack = packets.ACK(self.version, self.myaddr, self.remoteaddr,
70                         self.last_packet)
71    desc, rst = packets.RST(self.version, self.remoteaddr, self.myaddr,
72                            ack)
73    super(TcpBaseTest, self).ReceivePacketOn(netid, rst)
74
75  def RstPacket(self):
76    return packets.RST(self.version, self.myaddr, self.remoteaddr,
77                       self.last_packet)
78
79  def FinPacket(self):
80    return packets.FIN(self.version, self.myaddr, self.remoteaddr,
81                       self.last_packet)
82
83
84  def IncomingConnection(self, version, end_state, netid):
85    self.s = self.OpenListenSocket(version, netid)
86    self.end_state = end_state
87
88    remoteaddr = self.remoteaddr = self.GetRemoteAddress(version)
89    remotesockaddr = self.remotesockaddr = self.GetRemoteSocketAddress(version)
90
91    myaddr = self.myaddr = self.MyAddress(version, netid)
92    mysockaddr = self.mysockaddr = self.MySocketAddress(version, netid)
93
94    if version == 5: version = 4
95    self.version = version
96
97    if end_state == TCP_LISTEN:
98      return
99
100    desc, syn = packets.SYN(self.port, version, remoteaddr, myaddr)
101    synack_desc, synack = packets.SYNACK(version, myaddr, remoteaddr, syn)
102    msg = "Received %s, expected to see reply %s" % (desc, synack_desc)
103    reply = self._ReceiveAndExpectResponse(netid, syn, synack, msg)
104    if end_state == TCP_SYN_RECV:
105      return
106
107    establishing_ack = packets.ACK(version, remoteaddr, myaddr, reply)[1]
108    self.ReceivePacketOn(netid, establishing_ack)
109
110    if end_state == TCP_NOT_YET_ACCEPTED:
111      return
112
113    self.accepted, _ = self.s.accept()
114    net_test.DisableFinWait(self.accepted)
115
116    if end_state == TCP_ESTABLISHED:
117      return
118
119    desc, data = packets.ACK(version, myaddr, remoteaddr, establishing_ack,
120                             payload=net_test.UDP_PAYLOAD)
121    self.accepted.send(net_test.UDP_PAYLOAD)
122    self.ExpectPacketOn(netid, msg + ": expecting %s" % desc, data)
123
124    desc, fin = packets.FIN(version, remoteaddr, myaddr, data)
125    fin = packets._GetIpLayer(version)(str(fin))
126    ack_desc, ack = packets.ACK(version, myaddr, remoteaddr, fin)
127    msg = "Received %s, expected to see reply %s" % (desc, ack_desc)
128
129    # TODO: Why can't we use this?
130    #   self._ReceiveAndExpectResponse(netid, fin, ack, msg)
131    self.ReceivePacketOn(netid, fin)
132    time.sleep(0.1)
133    self.ExpectPacketOn(netid, msg + ": expecting %s" % ack_desc, ack)
134    if end_state == TCP_CLOSE_WAIT:
135      return
136
137    raise ValueError("Invalid TCP state %d specified" % end_state)
138