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Mini Shell
Mini Shell
# 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)
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._socket.connect(self._peer)
(self._send_wakeup, self._receive_wakeup) = socket.socketpair()
self._receive_wakeup.setblocking(False)
self._socket.setblocking(False)
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, 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)
self._handle_events()
with self._lock:
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
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):
with self._lock:
self._done = True
elif isinstance(event, aioquic.quic.events.StreamReset):
with self._lock:
stream = self._streams.get(event.stream_id)
if stream:
stream._add_input(b"", 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, want_session_ticket=True
):
with self._lock:
(connection, start) = self._connect(
address, port, source, source_port, want_session_ticket
)
if start:
connection.run()
return connection
def closed(self, address, port):
with self._lock:
super().closed(address, port)
def save_session_ticket(self, address, port, ticket):
with self._lock:
super().save_session_ticket(address, port, ticket)
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
Zerion Mini Shell 1.0