def IncomingConnection(self, version, end_state, netid):
self.s = self.OpenListenSocket(version, netid)
self.end_state = end_state
remoteaddr = self.remoteaddr = self.GetRemoteAddress(version)
remotesockaddr = self.remotesockaddr = self.GetRemoteSocketAddress(
version)
myaddr = self.myaddr = self.MyAddress(version, netid)
mysockaddr = self.mysockaddr = self.MySocketAddress(version, netid)
if version == 5: version = 4
self.version = version
if end_state == TCP_LISTEN:
return
desc, syn = packets.SYN(self.port, version, remoteaddr, myaddr)
synack_desc, synack = packets.SYNACK(version, myaddr, remoteaddr, syn)
msg = "Received %s, expected to see reply %s" % (desc, synack_desc)
reply = self._ReceiveAndExpectResponse(netid, syn, synack, msg)
if end_state == TCP_SYN_RECV:
return
establishing_ack = packets.ACK(version, remoteaddr, myaddr, reply)[1]
self.ReceivePacketOn(netid, establishing_ack)
if end_state == TCP_NOT_YET_ACCEPTED:
return
self.accepted, _ = self.s.accept()
net_test.DisableFinWait(self.accepted)
if end_state == TCP_ESTABLISHED:
return
desc, data = packets.ACK(version,
myaddr,
remoteaddr,
establishing_ack,
payload=net_test.UDP_PAYLOAD)
self.accepted.send(net_test.UDP_PAYLOAD)
self.ExpectPacketOn(netid, msg + ": expecting %s" % desc, data)
desc, fin = packets.FIN(version, remoteaddr, myaddr, data)
fin = packets._GetIpLayer(version)(str(fin))
ack_desc, ack = packets.ACK(version, myaddr, remoteaddr, fin)
msg = "Received %s, expected to see reply %s" % (desc, ack_desc)
# TODO: Why can't we use this?
# self._ReceiveAndExpectResponse(netid, fin, ack, msg)
self.ReceivePacketOn(netid, fin)
time.sleep(0.1)
self.ExpectPacketOn(netid, msg + ": expecting %s" % ack_desc, ack)
if end_state == TCP_CLOSE_WAIT:
return
raise ValueError("Invalid TCP state %d specified" % end_state)
def CheckForwardingCrash(self, netid, iface1, iface2):
listenport = packets.RandomPort()
listensocket = net_test.IPv6TCPSocket()
listensocket.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
listensocket.bind(("::", listenport))
listensocket.listen(100)
self.SetSocketMark(listensocket, netid)
version = 6
remoteaddr = self.GetRemoteAddress(version)
myaddr = self.MyAddress(version, netid)
desc, syn = packets.SYN(listenport, version, remoteaddr, myaddr)
synack_desc, synack = packets.SYNACK(version, myaddr, remoteaddr, syn)
msg = "Sent %s, expected %s" % (desc, synack_desc)
reply = self._ReceiveAndExpectResponse(netid, syn, synack, msg)
establishing_ack = packets.ACK(version, remoteaddr, myaddr, reply)[1]
self.ReceivePacketOn(netid, establishing_ack)
accepted, peer = listensocket.accept()
remoteport = accepted.getpeername()[1]
accepted.close()
desc, fin = packets.FIN(version, myaddr, remoteaddr, establishing_ack)
self.ExpectPacketOn(netid, msg + ": expecting %s after close" % desc,
fin)
desc, finack = packets.FIN(version, remoteaddr, myaddr, fin)
self.ReceivePacketOn(netid, finack)
# Check our socket is now in TIME_WAIT.
sockets = self.ReadProcNetSocket("tcp6")
mysrc = "%s:%04X" % (net_test.FormatSockStatAddress(myaddr),
listenport)
mydst = "%s:%04X" % (net_test.FormatSockStatAddress(remoteaddr),
remoteport)
state = None
sockets = [s for s in sockets if s[0] == mysrc and s[1] == mydst]
self.assertEquals(1, len(sockets))
self.assertEquals("%02X" % self.TCP_TIME_WAIT, sockets[0][2])
# Remove our IP address.
try:
self.iproute.DelAddress(myaddr, 64, self.ifindices[netid])
self.ReceivePacketOn(iface1, finack)
self.ReceivePacketOn(iface1, establishing_ack)
self.ReceivePacketOn(iface1, establishing_ack)
# No crashes? Good.
finally:
# Put back our IP address.
self.SendRA(netid)
listensocket.close()
def CheckTCP(self, version, modes):
"""Checks that incoming TCP connections work.
Args:
version: An integer, 4 or 6.
modes: A list of modes to excercise.
"""
for syncookies in [0, 2]:
for mode in modes:
for netid, iif, ip_if, myaddr, remoteaddr in self.Combinations(
version):
if mode == self.MODE_UID:
listensocket = self.BuildSocket(
6, net_test.TCPSocket, netid, mode)
listensocket.listen(100)
else:
listensocket = self.listensocket
listenport = listensocket.getsockname()[1]
accept_sysctl = 1 if mode == self.MODE_INCOMING_MARK else 0
self._SetTCPMarkAcceptSysctl(accept_sysctl)
bound_dev = iif if mode == self.MODE_BINDTODEVICE else None
self.BindToDevice(listensocket, bound_dev)
mark = netid if mode == self.MODE_EXPLICIT_MARK else 0
self.SetSocketMark(listensocket, mark)
# Generate the packet here instead of in the outer loop, so
# subsequent TCP connections use different source ports and
# retransmissions from old connections don't confuse subsequent
# tests.
desc, packet = packets.SYN(listenport, version, remoteaddr,
myaddr)
if mode:
reply_desc, reply = packets.SYNACK(
version, myaddr, remoteaddr, packet)
else:
reply_desc, reply = None, None
extra = "mode=%s, syncookies=%d" % (mode, syncookies)
msg = self._FormatMessage(iif, ip_if, extra, desc,
reply_desc)
reply = self._ReceiveAndExpectResponse(
netid, packet, reply, msg)
if reply:
self.CheckTCPConnection(mode, listensocket, netid,
version, myaddr, remoteaddr,
packet, reply, msg)
def CheckConnectOption(self, version):
ip_layer = {4: scapy.IP, 6: scapy.IPv6}[version]
netid = self.RandomNetid()
s = self.TFOClientSocket(version, netid)
self.clearTcpMetrics(version, netid)
# Connect the first time.
remoteaddr = self.GetRemoteAddress(version)
with self.assertRaisesErrno(EINPROGRESS):
s.connect((remoteaddr, 53))
self.assertSocketNotConnected(s)
# Expect a SYN handshake with an empty TFO option.
myaddr = self.MyAddress(version, netid)
port = s.getsockname()[1]
self.assertNotEqual(0, port)
desc, syn = packets.SYN(53,
version,
myaddr,
remoteaddr,
port,
seq=None)
syn.getlayer("TCP").options = [(TCPOPT_FASTOPEN, "")]
msg = "Fastopen connect: expected %s" % desc
syn = self.ExpectPacketOn(netid, msg, syn)
syn = ip_layer(str(syn))
# Receive a SYN+ACK with a TFO cookie and expect the connection to proceed
# as normal.
desc, synack = packets.SYNACK(version, remoteaddr, myaddr, syn)
synack.getlayer("TCP").options = [(TCPOPT_FASTOPEN, "helloT"),
("NOP", None), ("NOP", None)]
self.ReceivePacketOn(netid, synack)
synack = ip_layer(str(synack))
desc, ack = packets.ACK(version, myaddr, remoteaddr, synack)
msg = "First connect: got SYN+ACK, expected %s" % desc
self.ExpectPacketOn(netid, msg, ack)
self.assertSocketConnected(s)
s.close()
desc, rst = packets.RST(version, myaddr, remoteaddr, synack)
msg = "Closing client socket, expecting %s" % desc
self.ExpectPacketOn(netid, msg, rst)
# Connect to the same destination again. Expect the connect to succeed
# without sending a SYN packet.
s = self.TFOClientSocket(version, netid)
s.connect((remoteaddr, 53))
self.assertSocketNotConnected(s)
self.ExpectNoPacketsOn(netid,
"Second TFO connect, expected no packets")
# Issue a write and expect a SYN with data.
port = s.getsockname()[1]
s.send(net_test.UDP_PAYLOAD)
desc, syn = packets.SYN(53,
version,
myaddr,
remoteaddr,
port,
seq=None)
t = syn.getlayer(scapy.TCP)
t.options = [(TCPOPT_FASTOPEN, "helloT"), ("NOP", None), ("NOP", None)]
t.payload = scapy.Raw(net_test.UDP_PAYLOAD)
msg = "TFO write, expected %s" % desc
self.ExpectPacketOn(netid, msg, syn)