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