codekingpro/portable-devtools

1# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license2 3import selectors4import socket5import ssl6import struct7import threading8import time9 10import aioquic.quic.configuration  # type: ignore11import aioquic.quic.connection  # type: ignore12import aioquic.quic.events  # type: ignore13 14import dns.exception15import dns.inet16from dns.quic._common import (17    QUIC_MAX_DATAGRAM,18    BaseQuicConnection,19    BaseQuicManager,20    BaseQuicStream,21    UnexpectedEOF,22)23 24# Avoid circularity with dns.query25if hasattr(selectors, "PollSelector"):26    _selector_class = selectors.PollSelector  # type: ignore27else:28    _selector_class = selectors.SelectSelector  # type: ignore29 30 31class SyncQuicStream(BaseQuicStream):32    def __init__(self, connection, stream_id):33        super().__init__(connection, stream_id)34        self._wake_up = threading.Condition()35        self._lock = threading.Lock()36 37    def wait_for(self, amount, expiration):38        while True:39            timeout = self._timeout_from_expiration(expiration)40            with self._lock:41                if self._buffer.have(amount):42                    return43                self._expecting = amount44            with self._wake_up:45                if not self._wake_up.wait(timeout):46                    raise dns.exception.Timeout47            self._expecting = 048 49    def receive(self, timeout=None):50        expiration = self._expiration_from_timeout(timeout)51        self.wait_for(2, expiration)52        with self._lock:53            (size,) = struct.unpack("!H", self._buffer.get(2))54        self.wait_for(size, expiration)55        with self._lock:56            return self._buffer.get(size)57 58    def send(self, datagram, is_end=False):59        data = self._encapsulate(datagram)60        self._connection.write(self._stream_id, data, is_end)61 62    def _add_input(self, data, is_end):63        if self._common_add_input(data, is_end):64            with self._wake_up:65                self._wake_up.notify()66 67    def close(self):68        with self._lock:69            self._close()70 71    def __enter__(self):72        return self73 74    def __exit__(self, exc_type, exc_val, exc_tb):75        self.close()76        with self._wake_up:77            self._wake_up.notify()78        return False79 80 81class SyncQuicConnection(BaseQuicConnection):82    def __init__(self, connection, address, port, source, source_port, manager):83        super().__init__(connection, address, port, source, source_port, manager)84        self._socket = socket.socket(self._af, socket.SOCK_DGRAM, 0)85        if self._source is not None:86            try:87                self._socket.bind(88                    dns.inet.low_level_address_tuple(self._source, self._af)89                )90            except Exception:91                self._socket.close()92                raise93        self._socket.connect(self._peer)94        (self._send_wakeup, self._receive_wakeup) = socket.socketpair()95        self._receive_wakeup.setblocking(False)96        self._socket.setblocking(False)97        self._handshake_complete = threading.Event()98        self._worker_thread = None99        self._lock = threading.Lock()100 101    def _read(self):102        count = 0103        while count < 10:104            count += 1105            try:106                datagram = self._socket.recv(QUIC_MAX_DATAGRAM)107            except BlockingIOError:108                return109            with self._lock:110                self._connection.receive_datagram(datagram, self._peer, time.time())111 112    def _drain_wakeup(self):113        while True:114            try:115                self._receive_wakeup.recv(32)116            except BlockingIOError:117                return118 119    def _worker(self):120        try:121            sel = _selector_class()122            sel.register(self._socket, selectors.EVENT_READ, self._read)123            sel.register(self._receive_wakeup, selectors.EVENT_READ, self._drain_wakeup)124            while not self._done:125                (expiration, interval) = self._get_timer_values(False)126                items = sel.select(interval)127                for key, _ in items:128                    key.data()129                with self._lock:130                    self._handle_timer(expiration)131                self._handle_events()132                with self._lock:133                    datagrams = self._connection.datagrams_to_send(time.time())134                for datagram, _ in datagrams:135                    try:136                        self._socket.send(datagram)137                    except BlockingIOError:138                        # we let QUIC handle any lossage139                        pass140        finally:141            with self._lock:142                self._done = True143            # Ensure anyone waiting for this gets woken up.144            self._handshake_complete.set()145 146    def _handle_events(self):147        while True:148            with self._lock:149                event = self._connection.next_event()150            if event is None:151                return152            if isinstance(event, aioquic.quic.events.StreamDataReceived):153                with self._lock:154                    stream = self._streams.get(event.stream_id)155                if stream:156                    stream._add_input(event.data, event.end_stream)157            elif isinstance(event, aioquic.quic.events.HandshakeCompleted):158                self._handshake_complete.set()159            elif isinstance(event, aioquic.quic.events.ConnectionTerminated):160                with self._lock:161                    self._done = True162            elif isinstance(event, aioquic.quic.events.StreamReset):163                with self._lock:164                    stream = self._streams.get(event.stream_id)165                if stream:166                    stream._add_input(b"", True)167 168    def write(self, stream, data, is_end=False):169        with self._lock:170            self._connection.send_stream_data(stream, data, is_end)171        self._send_wakeup.send(b"\x01")172 173    def run(self):174        if self._closed:175            return176        self._worker_thread = threading.Thread(target=self._worker)177        self._worker_thread.start()178 179    def make_stream(self, timeout=None):180        if not self._handshake_complete.wait(timeout):181            raise dns.exception.Timeout182        with self._lock:183            if self._done:184                raise UnexpectedEOF185            stream_id = self._connection.get_next_available_stream_id(False)186            stream = SyncQuicStream(self, stream_id)187            self._streams[stream_id] = stream188        return stream189 190    def close_stream(self, stream_id):191        with self._lock:192            super().close_stream(stream_id)193 194    def close(self):195        with self._lock:196            if self._closed:197                return198            self._manager.closed(self._peer[0], self._peer[1])199            self._closed = True200            self._connection.close()201            self._send_wakeup.send(b"\x01")202        self._worker_thread.join()203 204 205class SyncQuicManager(BaseQuicManager):206    def __init__(self, conf=None, verify_mode=ssl.CERT_REQUIRED, server_name=None):207        super().__init__(conf, verify_mode, SyncQuicConnection, server_name)208        self._lock = threading.Lock()209 210    def connect(211        self, address, port=853, source=None, source_port=0, want_session_ticket=True212    ):213        with self._lock:214            (connection, start) = self._connect(215                address, port, source, source_port, want_session_ticket216            )217            if start:218                connection.run()219            return connection220 221    def closed(self, address, port):222        with self._lock:223            super().closed(address, port)224 225    def save_session_ticket(self, address, port, ticket):226        with self._lock:227            super().save_session_ticket(address, port, ticket)228 229    def __enter__(self):230        return self231 232    def __exit__(self, exc_type, exc_val, exc_tb):233        # Copy the iterator into a list as exiting things will mutate the connections234        # table.235        connections = list(self._connections.values())236        for connection in connections:237            connection.close()238        return False239