| import asyncio
|
| import os
|
| from functools import partial
|
| from typing import Callable, Dict, Optional, Text, Union, cast
|
|
|
| from ..buffer import Buffer
|
| from ..quic.configuration import SMALLEST_MAX_DATAGRAM_SIZE, QuicConfiguration
|
| from ..quic.connection import NetworkAddress, QuicConnection
|
| from ..quic.packet import (
|
| QuicPacketType,
|
| encode_quic_retry,
|
| encode_quic_version_negotiation,
|
| pull_quic_header,
|
| )
|
| from ..quic.retry import QuicRetryTokenHandler
|
| from ..tls import SessionTicketFetcher, SessionTicketHandler
|
| from .protocol import QuicConnectionProtocol, QuicStreamHandler
|
|
|
| __all__ = ["serve"]
|
|
|
|
|
| class QuicServer(asyncio.DatagramProtocol):
|
| def __init__(
|
| self,
|
| *,
|
| configuration: QuicConfiguration,
|
| create_protocol: Callable = QuicConnectionProtocol,
|
| session_ticket_fetcher: Optional[SessionTicketFetcher] = None,
|
| session_ticket_handler: Optional[SessionTicketHandler] = None,
|
| retry: bool = False,
|
| stream_handler: Optional[QuicStreamHandler] = None,
|
| ) -> None:
|
| self._configuration = configuration
|
| self._create_protocol = create_protocol
|
| self._loop = asyncio.get_event_loop()
|
| self._protocols: Dict[bytes, QuicConnectionProtocol] = {}
|
| self._session_ticket_fetcher = session_ticket_fetcher
|
| self._session_ticket_handler = session_ticket_handler
|
| self._transport: Optional[asyncio.DatagramTransport] = None
|
|
|
| self._stream_handler = stream_handler
|
|
|
| if retry:
|
| self._retry = QuicRetryTokenHandler()
|
| else:
|
| self._retry = None
|
|
|
| def close(self):
|
| for protocol in set(self._protocols.values()):
|
| protocol.close()
|
| self._protocols.clear()
|
| self._transport.close()
|
|
|
| def connection_made(self, transport: asyncio.BaseTransport) -> None:
|
| self._transport = cast(asyncio.DatagramTransport, transport)
|
|
|
| def datagram_received(self, data: Union[bytes, Text], addr: NetworkAddress) -> None:
|
| data = cast(bytes, data)
|
| buf = Buffer(data=data)
|
|
|
| try:
|
| header = pull_quic_header(
|
| buf, host_cid_length=self._configuration.connection_id_length
|
| )
|
| except ValueError:
|
| return
|
|
|
|
|
| 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) >= SMALLEST_MAX_DATAGRAM_SIZE
|
| and header.packet_type == QuicPacketType.INITIAL
|
| ):
|
|
|
| if self._retry is not None:
|
| if not header.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:
|
|
|
| try:
|
| (
|
| original_destination_connection_id,
|
| retry_source_connection_id,
|
| ) = self._retry.validate_token(addr, header.token)
|
| except ValueError:
|
| return
|
| else:
|
| original_destination_connection_id = header.destination_cid
|
|
|
|
|
| connection = QuicConnection(
|
| configuration=self._configuration,
|
| original_destination_connection_id=original_destination_connection_id,
|
| retry_source_connection_id=retry_source_connection_id,
|
| session_ticket_fetcher=self._session_ticket_fetcher,
|
| session_ticket_handler=self._session_ticket_handler,
|
| )
|
| protocol = self._create_protocol(
|
| connection, stream_handler=self._stream_handler
|
| )
|
| protocol.connection_made(self._transport)
|
|
|
|
|
| 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)
|
|
|
| def _connection_id_issued(self, cid: bytes, protocol: QuicConnectionProtocol):
|
| self._protocols[cid] = protocol
|
|
|
| def _connection_id_retired(
|
| self, cid: bytes, protocol: QuicConnectionProtocol
|
| ) -> None:
|
| assert self._protocols[cid] == protocol
|
| del self._protocols[cid]
|
|
|
| def _connection_terminated(self, protocol: QuicConnectionProtocol):
|
| for cid, proto in list(self._protocols.items()):
|
| if proto == protocol:
|
| del self._protocols[cid]
|
|
|
|
|
| async def serve(
|
| host: str,
|
| port: int,
|
| *,
|
| configuration: QuicConfiguration,
|
| create_protocol: Callable = QuicConnectionProtocol,
|
| session_ticket_fetcher: Optional[SessionTicketFetcher] = None,
|
| session_ticket_handler: Optional[SessionTicketHandler] = None,
|
| retry: bool = False,
|
| stream_handler: QuicStreamHandler = None,
|
| ) -> QuicServer:
|
| """
|
| Start a QUIC server at the given `host` and `port`.
|
|
|
| :func:`serve` requires a :class:`~aioquic.quic.configuration.QuicConfiguration`
|
| containing TLS certificate and private key as the ``configuration`` argument.
|
|
|
| :func:`serve` also accepts the following optional arguments:
|
|
|
| * ``create_protocol`` allows customizing the :class:`~asyncio.Protocol` that
|
| manages the connection. It should be a callable or class accepting the same
|
| arguments as :class:`~aioquic.asyncio.QuicConnectionProtocol` and returning
|
| an instance of :class:`~aioquic.asyncio.QuicConnectionProtocol` or a subclass.
|
| * ``session_ticket_fetcher`` is a callback which is invoked by the TLS
|
| engine when a session ticket is presented by the peer. It should return
|
| the session ticket with the specified ID or `None` if it is not found.
|
| * ``session_ticket_handler`` is a callback which is invoked by the TLS
|
| engine when a new session ticket is issued. It should store the session
|
| ticket for future lookup.
|
| * ``retry`` specifies whether client addresses should be validated prior to
|
| the cryptographic handshake using a retry packet.
|
| * ``stream_handler`` is a callback which is invoked whenever a stream is
|
| created. It must accept two arguments: a :class:`asyncio.StreamReader`
|
| and a :class:`asyncio.StreamWriter`.
|
| """
|
|
|
| loop = asyncio.get_event_loop()
|
|
|
| _, protocol = await loop.create_datagram_endpoint(
|
| lambda: QuicServer(
|
| configuration=configuration,
|
| create_protocol=create_protocol,
|
| session_ticket_fetcher=session_ticket_fetcher,
|
| session_ticket_handler=session_ticket_handler,
|
| retry=retry,
|
| stream_handler=stream_handler,
|
| ),
|
| local_addr=(host, port),
|
| )
|
| return protocol
|
|
|
