296 lines
10 KiB
Python
296 lines
10 KiB
Python
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
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import selectors
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import socket
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import ssl
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import struct
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import threading
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import time
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import aioquic.quic.configuration # type: ignore
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import aioquic.quic.connection # type: ignore
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import aioquic.quic.events # type: ignore
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import dns.exception
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import dns.inet
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from dns.quic._common import (
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QUIC_MAX_DATAGRAM,
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BaseQuicConnection,
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BaseQuicManager,
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BaseQuicStream,
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UnexpectedEOF,
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)
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# Function used to create a socket. Can be overridden if needed in special
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# situations.
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socket_factory = socket.socket
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class SyncQuicStream(BaseQuicStream):
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def __init__(self, connection, stream_id):
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super().__init__(connection, stream_id)
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self._wake_up = threading.Condition()
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self._lock = threading.Lock()
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def wait_for(self, amount, expiration):
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while True:
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timeout = self._timeout_from_expiration(expiration)
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with self._lock:
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if self._buffer.have(amount):
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return
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self._expecting = amount
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with self._wake_up:
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if not self._wake_up.wait(timeout):
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raise dns.exception.Timeout
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self._expecting = 0
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def wait_for_end(self, expiration):
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while True:
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timeout = self._timeout_from_expiration(expiration)
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with self._lock:
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if self._buffer.seen_end():
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return
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with self._wake_up:
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if not self._wake_up.wait(timeout):
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raise dns.exception.Timeout
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def receive(self, timeout=None):
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expiration = self._expiration_from_timeout(timeout)
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if self._connection.is_h3():
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self.wait_for_end(expiration)
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with self._lock:
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return self._buffer.get_all()
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else:
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self.wait_for(2, expiration)
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with self._lock:
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(size,) = struct.unpack("!H", self._buffer.get(2))
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self.wait_for(size, expiration)
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with self._lock:
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return self._buffer.get(size)
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def send(self, datagram, is_end=False):
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data = self._encapsulate(datagram)
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self._connection.write(self._stream_id, data, is_end)
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def _add_input(self, data, is_end):
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if self._common_add_input(data, is_end):
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with self._wake_up:
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self._wake_up.notify()
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def close(self):
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with self._lock:
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self._close()
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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self.close()
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with self._wake_up:
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self._wake_up.notify()
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return False
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class SyncQuicConnection(BaseQuicConnection):
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def __init__(self, connection, address, port, source, source_port, manager):
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super().__init__(connection, address, port, source, source_port, manager)
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self._socket = socket_factory(self._af, socket.SOCK_DGRAM, 0)
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if self._source is not None:
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try:
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self._socket.bind(
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dns.inet.low_level_address_tuple(self._source, self._af)
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)
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except Exception:
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self._socket.close()
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raise
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self._socket.connect(self._peer)
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(self._send_wakeup, self._receive_wakeup) = socket.socketpair()
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self._receive_wakeup.setblocking(False)
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self._socket.setblocking(False)
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self._handshake_complete = threading.Event()
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self._worker_thread = None
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self._lock = threading.Lock()
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def _read(self):
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count = 0
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while count < 10:
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count += 1
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try:
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datagram = self._socket.recv(QUIC_MAX_DATAGRAM)
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except BlockingIOError:
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return
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with self._lock:
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self._connection.receive_datagram(datagram, self._peer, time.time())
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def _drain_wakeup(self):
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while True:
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try:
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self._receive_wakeup.recv(32)
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except BlockingIOError:
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return
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def _worker(self):
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try:
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sel = selectors.DefaultSelector()
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sel.register(self._socket, selectors.EVENT_READ, self._read)
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sel.register(self._receive_wakeup, selectors.EVENT_READ, self._drain_wakeup)
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while not self._done:
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(expiration, interval) = self._get_timer_values(False)
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items = sel.select(interval)
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for key, _ in items:
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key.data()
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with self._lock:
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self._handle_timer(expiration)
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self._handle_events()
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with self._lock:
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datagrams = self._connection.datagrams_to_send(time.time())
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for datagram, _ in datagrams:
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try:
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self._socket.send(datagram)
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except BlockingIOError:
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# we let QUIC handle any lossage
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pass
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finally:
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with self._lock:
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self._done = True
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self._socket.close()
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# Ensure anyone waiting for this gets woken up.
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self._handshake_complete.set()
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def _handle_events(self):
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while True:
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with self._lock:
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event = self._connection.next_event()
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if event is None:
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return
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if isinstance(event, aioquic.quic.events.StreamDataReceived):
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if self.is_h3():
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h3_events = self._h3_conn.handle_event(event)
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for h3_event in h3_events:
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if isinstance(h3_event, aioquic.h3.events.HeadersReceived):
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with self._lock:
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stream = self._streams.get(event.stream_id)
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if stream:
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if stream._headers is None:
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stream._headers = h3_event.headers
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elif stream._trailers is None:
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stream._trailers = h3_event.headers
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if h3_event.stream_ended:
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stream._add_input(b"", True)
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elif isinstance(h3_event, aioquic.h3.events.DataReceived):
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with self._lock:
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stream = self._streams.get(event.stream_id)
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if stream:
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stream._add_input(h3_event.data, h3_event.stream_ended)
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else:
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with self._lock:
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stream = self._streams.get(event.stream_id)
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if stream:
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stream._add_input(event.data, event.end_stream)
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elif isinstance(event, aioquic.quic.events.HandshakeCompleted):
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self._handshake_complete.set()
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elif isinstance(event, aioquic.quic.events.ConnectionTerminated):
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with self._lock:
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self._done = True
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elif isinstance(event, aioquic.quic.events.StreamReset):
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with self._lock:
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stream = self._streams.get(event.stream_id)
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if stream:
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stream._add_input(b"", True)
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def write(self, stream, data, is_end=False):
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with self._lock:
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self._connection.send_stream_data(stream, data, is_end)
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self._send_wakeup.send(b"\x01")
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def send_headers(self, stream_id, headers, is_end=False):
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with self._lock:
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super().send_headers(stream_id, headers, is_end)
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if is_end:
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self._send_wakeup.send(b"\x01")
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def send_data(self, stream_id, data, is_end=False):
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with self._lock:
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super().send_data(stream_id, data, is_end)
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if is_end:
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self._send_wakeup.send(b"\x01")
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def run(self):
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if self._closed:
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return
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self._worker_thread = threading.Thread(target=self._worker)
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self._worker_thread.start()
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def make_stream(self, timeout=None):
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if not self._handshake_complete.wait(timeout):
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raise dns.exception.Timeout
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with self._lock:
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if self._done:
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raise UnexpectedEOF
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stream_id = self._connection.get_next_available_stream_id(False)
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stream = SyncQuicStream(self, stream_id)
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self._streams[stream_id] = stream
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return stream
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def close_stream(self, stream_id):
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with self._lock:
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super().close_stream(stream_id)
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def close(self):
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with self._lock:
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if self._closed:
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return
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self._manager.closed(self._peer[0], self._peer[1])
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self._closed = True
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self._connection.close()
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self._send_wakeup.send(b"\x01")
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self._worker_thread.join()
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class SyncQuicManager(BaseQuicManager):
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def __init__(
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self, conf=None, verify_mode=ssl.CERT_REQUIRED, server_name=None, h3=False
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):
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super().__init__(conf, verify_mode, SyncQuicConnection, server_name, h3)
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self._lock = threading.Lock()
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def connect(
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self,
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address,
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port=853,
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source=None,
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source_port=0,
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want_session_ticket=True,
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want_token=True,
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):
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with self._lock:
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(connection, start) = self._connect(
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address, port, source, source_port, want_session_ticket, want_token
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)
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if start:
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connection.run()
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return connection
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def closed(self, address, port):
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with self._lock:
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super().closed(address, port)
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def save_session_ticket(self, address, port, ticket):
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with self._lock:
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super().save_session_ticket(address, port, ticket)
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def save_token(self, address, port, token):
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with self._lock:
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super().save_token(address, port, token)
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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# Copy the iterator into a list as exiting things will mutate the connections
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# table.
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connections = list(self._connections.values())
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for connection in connections:
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connection.close()
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return False
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