async def handle(self, event: Event) -> None:
if isinstance(event, RawData):
try:
header = pull_quic_header(Buffer(data=event.data), host_cid_length=8)
except ValueError:
return
if (
header.version is not None
and header.version not in self.quic_config.supported_versions
):
data = encode_quic_version_negotiation(
source_cid=header.destination_cid,
destination_cid=header.source_cid,
supported_versions=self.quic_config.supported_versions,
)
await self.send(RawData(data=data, address=event.address))
return
connection = self.connections.get(header.destination_cid)
if (
connection is None
and len(event.data) >= 1200
and header.packet_type == PACKET_TYPE_INITIAL
):
connection = QuicConnection(
configuration=self.quic_config, original_connection_id=None
)
self.connections[header.destination_cid] = connection
self.connections[connection.host_cid] = connection
if connection is not None:
connection.receive_datagram(event.data, event.address, now=self.now())
await self._handle_events(connection, event.address)
elif isinstance(event, Closed):
pass
def test_encode_quic_version_negotiation(self):
data = encode_quic_version_negotiation(
destination_cid=binascii.unhexlify("9aac5a49ba87a849"),
source_cid=binascii.unhexlify("f92f4336fa951ba1"),
supported_versions=[0x45474716, QuicProtocolVersion.DRAFT_22],
)
self.assertEqual(data[1:], load("version_negotiation.bin")[1:])
def _make_connection(self, channel, data):
ctx = channel.server.ctx
buf = Buffer(data=data)
header = pull_quic_header(buf,
host_cid_length=ctx.connection_id_length)
# version negotiation
if header.version is not None and header.version not in ctx.supported_versions:
self.channel.push(
encode_quic_version_negotiation(
source_cid=header.destination_cid,
destination_cid=header.source_cid,
supported_versions=ctx.supported_versions,
))
return
conn = self.conns.get(header.destination_cid)
if conn:
conn._linked_channel.close()
conn._linked_channel = channel
self.quic = conn._quic
self.conn = conn
return
if header.packet_type != PACKET_TYPE_INITIAL or len(data) < 1200:
return
original_connection_id = None
if self._retry is not None:
if not header.token:
# create a retry token
channel.push(
encode_quic_retry(
version=header.version,
source_cid=os.urandom(8),
destination_cid=header.source_cid,
original_destination_cid=header.destination_cid,
retry_token=self._retry.create_token(
channel.addr, header.destination_cid)))
return
else:
try:
original_connection_id = self._retry.validate_token(
channel.addr, header.token)
except ValueError:
return
self.quic = QuicConnection(
configuration=ctx,
logger_connection_id=original_connection_id
or header.destination_cid,
original_connection_id=original_connection_id,
session_ticket_fetcher=channel.server.ticket_store.pop,
session_ticket_handler=channel.server.ticket_store.add)
self.conn = H3Connection(self.quic)
self.conn._linked_channel = channel
def datagram_received(self, data: Union[bytes, Text],
addr: NetworkAddress) -> None:
data = cast(bytes, data)
buf = Buffer(data=data)
# logger.info("datagram received")
global totalDatagrams
totalDatagrams += 1
# logger.info('total:{} {}'.format(totalDatagrams, addr))
try:
header = pull_quic_header(
buf, host_cid_length=self._configuration.connection_id_length)
except ValueError:
return
# version negotiation
if (header.version is not None and header.version
not in self._configuration.supported_versions):
self._transport.sendto(
encode_quic_version_negotiation(
source_cid=header.destination_cid,
destination_cid=header.source_cid,
supported_versions=self._configuration.supported_versions,
),
addr,
)
return
protocol = self._protocols.get(header.destination_cid, None)
original_destination_connection_id: Optional[bytes] = None
retry_source_connection_id: Optional[bytes] = None
if (protocol is None and len(data) >= 1200
and header.packet_type == PACKET_TYPE_INITIAL):
#retry
if self._retry is not None:
if not header.token:
# create a retry token
source_cid = os.urandom(8)
self._transport.sendto(
encode_quic_retry(
version=header.version,
source_cid=source_cid,
destination_cid=header.source_cid,
original_destination_cid=header.destination_cid,
retry_token=self._retry.create_token(
addr, header.destination_cid, source_cid),
),
addr,
)
return
else:
# validate retry token
try:
(original_destination_cid, retry_source_connection_id
) = self._retry.validate_token(addr, header.token)
except ValueError:
return
else:
original_destination_connection_id = header.destination_cid
# create new connection
connection = QuicConnection(
configuration=self._configuration,
original_destination_connection_id=
original_destination_connection_id,
retry_source_connection_id=retry_source_connection_id,
session_ticket_handler=self._session_ticket_handler,
session_ticket_fetcher=self._session_ticket_fetcher,
)
# initiate the QuicSocketFactory class with the below call.
protocol = self._create_protocol(
connection, stream_handler=self._stream_handler)
protocol.connection_made(self._transport)
# register callbacks
protocol._connection_id_issued_handler = partial(
self._connection_id_issued, protocol=protocol)
protocol._connection_id_retired_handler = partial(
self._connection_id_retired, protocol=protocol)
protocol._connection_terminated_handler = partial(
self._connection_terminated, protocol=protocol)
self._protocols[header.destination_cid] = protocol
self._protocols[connection.host_cid] = protocol
if protocol is not None:
protocol.datagram_received(data, addr)
