752 lines
31 KiB
Python
752 lines
31 KiB
Python
from __future__ import print_function
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from collections import deque
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from threading import RLock
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import zlib
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import threading
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import socket
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import timeit
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import select
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import sys
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import json
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import re
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from future.utils import raise_
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from .types import VarInt
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from .packets import clientbound, serverbound
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from . import packets
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from . import encryption
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from .. import SUPPORTED_PROTOCOL_VERSIONS, SUPPORTED_MINECRAFT_VERSIONS
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from ..exceptions import (
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VersionMismatch, LoginDisconnect, IgnorePacket, InvalidState
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)
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STATE_STATUS = 1
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STATE_PLAYING = 2
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class ConnectionContext(object):
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"""A ConnectionContext encapsulates the static configuration parameters
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shared by the Connection class with other classes, such as Packet.
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Importantly, it can be used without knowing the interface of Connection.
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"""
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def __init__(self, **kwds):
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self.protocol_version = kwds.get('protocol_version')
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class _ConnectionOptions(object):
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def __init__(self, address=None, port=None, compression_threshold=-1,
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compression_enabled=False):
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self.address = address
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self.port = port
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self.compression_threshold = compression_threshold
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self.compression_enabled = compression_enabled
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class Connection(object):
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"""This class represents a connection to a minecraft
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server, it handles everything from connecting, sending packets to
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handling default network behaviour
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"""
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def __init__(
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self,
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address,
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port=25565,
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auth_token=None,
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username=None,
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initial_version=None,
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allowed_versions=None,
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handle_exception=None,
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handle_exit=None,
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):
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"""Sets up an instance of this object to be able to connect to a
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minecraft server.
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The connect method needs to be called in order to actually begin
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the connection
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:param address: address of the server to connect to
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:param port(int): port of the server to connect to
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:param auth_token: :class:`minecraft.authentication.AuthenticationToken`
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object. If None, no authentication is attempted and
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the server is assumed to be running in offline mode.
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:param username: Username string; only applicable in offline mode.
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:param initial_version: A Minecraft version string or protocol version
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number to use if the server's protocol version
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cannot be determined. (Although it is now
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somewhat inaccurate, this name is retained for
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backward compatibility.)
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:param allowed_versions: A set of versions, each being a Minecraft
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version string or protocol version number,
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restricting the versions that the client may
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use in connecting to the server.
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:param handle_exception: A function to be called when an exception
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occurs in the client's networking thread,
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taking 2 arguments: the exception object 'e'
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as in 'except Exception as e', and a 3-tuple
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given by sys.exc_info(); or None for the
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default behaviour of raising the exception
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from its original context; or False for no
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action. In any case, the networking thread
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will terminate, the exception will be
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available via the 'exception' and 'exc_info'
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attributes of the 'Connection' instance.
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:param handle_exit: A function to be called when a connection to a
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server terminates, not caused by an exception,
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and not with the intention to automatically
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reconnect. Exceptions raised in this handler
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will be handled by handle_exception.
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""" # NOQA
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# This lock is re-entrant because it may be acquired in a re-entrant
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# manner from within an outgoing packet listener
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self._write_lock = RLock()
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self.networking_thread = None
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self.new_networking_thread = None
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self.packet_listeners = []
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self.early_packet_listeners = []
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self.outgoing_packet_listeners = []
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self.early_outgoing_packet_listeners = []
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def proto_version(version):
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if isinstance(version, str):
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proto_version = SUPPORTED_MINECRAFT_VERSIONS.get(version)
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elif isinstance(version, int):
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proto_version = version
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else:
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proto_version = None
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if proto_version not in SUPPORTED_PROTOCOL_VERSIONS:
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raise ValueError('Unsupported version number: %r.' % version)
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return proto_version
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if allowed_versions is None:
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self.allowed_proto_versions = set(SUPPORTED_PROTOCOL_VERSIONS)
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else:
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allowed_versions = set(map(proto_version, allowed_versions))
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self.allowed_proto_versions = allowed_versions
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if initial_version is None:
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self.default_proto_version = max(self.allowed_proto_versions)
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else:
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self.default_proto_version = proto_version(initial_version)
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self.context = ConnectionContext(
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protocol_version=max(self.allowed_proto_versions))
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self.options = _ConnectionOptions()
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self.options.address = address
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self.options.port = port
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self.auth_token = auth_token
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self.username = username
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self.connected = False
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self.handle_exception = handle_exception
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self.exception, self.exc_info = None, None
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self.handle_exit = handle_exit
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# The reactor handles all the default responses to packets,
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# it should be changed per networking state
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self.reactor = PacketReactor(self)
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def _start_network_thread(self):
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with self._write_lock:
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if self.networking_thread is not None and \
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not self.networking_thread.interrupt or \
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self.new_networking_thread is not None:
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raise InvalidState('A networking thread is already running.')
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elif self.networking_thread is None:
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self.networking_thread = NetworkingThread(self)
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self.networking_thread.start()
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else:
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# This thread will wait until the existing thread exits, and
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# then set 'networking_thread' to itself and
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# 'new_networking_thread' to None.
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self.new_networking_thread \
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= NetworkingThread(self, previous=self.networking_thread)
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self.new_networking_thread.start()
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def write_packet(self, packet, force=False):
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"""Writes a packet to the server.
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If force is set to true, the method attempts to acquire the write lock
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and write the packet out immediately, and as such may block.
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If force is false then the packet will be added to the end of the
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packet writing queue to be sent 'as soon as possible'
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:param packet: The :class:`network.packets.Packet` to write
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:param force(bool): Specifies if the packet write should be immediate
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"""
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packet.context = self.context
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if force:
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with self._write_lock:
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self._write_packet(packet)
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else:
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self._outgoing_packet_queue.append(packet)
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def register_packet_listener(self, method, *packet_types, **kwds):
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"""
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Registers a listener method which will be notified when a packet of
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a selected type is received.
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If :class:`minecraft.networking.connection.IgnorePacket` is raised from
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within this method, no subsequent handlers will be called. If
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'early=True', this has the additional effect of preventing the default
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in-built action; this could break the internal state of the
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'Connection', so should be done with care. If, in addition,
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'outgoing=True', this will prevent the packet from being written to the
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network.
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:param method: The method which will be called back with the packet
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:param packet_types: The packets to listen for
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:param outgoing: If 'True', this listener will be called on outgoing
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packets just after they are sent to the server, rather
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than on incoming packets.
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:param early: If 'True', this listener will be called before any
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built-in default action is carried out, and before any
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listeners with 'early=False' are called. If
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'outgoing=True', the listener will be called before the
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packet is written to the network, rather than afterwards.
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"""
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outgoing = kwds.pop('outgoing', False)
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early = kwds.pop('early', False)
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target = self.packet_listeners if not early and not outgoing \
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else self.early_packet_listeners if early and not outgoing \
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else self.outgoing_packet_listeners if not early \
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else self.early_outgoing_packet_listeners
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target.append(packets.PacketListener(method, *packet_types, **kwds))
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def _pop_packet(self):
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# Pops the topmost packet off the outgoing queue and writes it out
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# through the socket
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#
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# Mostly an internal convenience function, caller should make sure
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# they have the write lock acquired to avoid issues caused by
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# asynchronous access to the socket.
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# This should be the only method that removes elements from the
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# outbound queue
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if len(self._outgoing_packet_queue) == 0:
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return False
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else:
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self._write_packet(self._outgoing_packet_queue.popleft())
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return True
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def _write_packet(self, packet):
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# Immediately writes the given packet to the network. The caller must
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# have the write lock acquired before calling this method.
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try:
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for listener in self.early_outgoing_packet_listeners:
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listener.call_packet(packet)
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if self.options.compression_enabled:
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packet.write(self.socket, self.options.compression_threshold)
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else:
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packet.write(self.socket)
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for listener in self.outgoing_packet_listeners:
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listener.call_packet(packet)
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except IgnorePacket:
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pass
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def status(self, handle_status=None, handle_ping=False):
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"""Issue a status request to the server and then disconnect.
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:param handle_status: a function to be called with the status
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dictionary None for the default behaviour of
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printing the dictionary to standard output, or
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False to ignore the result.
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:param handle_ping: a function to be called with the measured latency
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in milliseconds, None for the default handler,
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which prints the latency to standard outout, or
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False, to prevent measurement of the latency.
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"""
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with self._write_lock: # pylint: disable=not-context-manager
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self._check_connection()
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self._connect()
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self._handshake(next_state=STATE_STATUS)
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self._start_network_thread()
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do_ping = handle_ping is not False
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self.reactor = StatusReactor(self, do_ping=do_ping)
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if handle_status is False:
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self.reactor.handle_status = lambda *args, **kwds: None
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elif handle_status is not None:
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self.reactor.handle_status = handle_status
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if handle_ping is False:
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self.reactor.handle_ping = lambda *args, **kwds: None
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elif handle_ping is not None:
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self.reactor.handle_ping = handle_ping
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request_packet = serverbound.status.RequestPacket()
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self.write_packet(request_packet)
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def connect(self):
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"""
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Attempt to begin connecting to the server.
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May safely be called multiple times after the first, i.e. to reconnect.
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"""
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# Hold the lock throughout, in case connect() is called from the
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# networking thread while another connection is in progress.
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with self._write_lock: # pylint: disable=not-context-manager
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self._check_connection()
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# It is important that this is set correctly even when connecting
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# in status mode, as some servers, e.g. SpigotMC with the
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# ProtocolSupport plugin, use it to determine the correct response.
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self.context.protocol_version = max(self.allowed_proto_versions)
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self.spawned = False
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self._connect()
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if len(self.allowed_proto_versions) == 1:
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# There is exactly one allowed protocol version, so skip the
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# process of determining the server's version, and immediately
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# connect.
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self._handshake(next_state=STATE_PLAYING)
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login_start_packet = serverbound.login.LoginStartPacket()
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if self.auth_token:
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login_start_packet.name = self.auth_token.profile.name
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else:
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login_start_packet.name = self.username
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self.write_packet(login_start_packet)
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self.reactor = LoginReactor(self)
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else:
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# Determine the server's protocol version by first performing a
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# status query.
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self._handshake(next_state=STATE_STATUS)
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self.write_packet(serverbound.status.RequestPacket())
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self.reactor = PlayingStatusReactor(self)
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self._start_network_thread()
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def _check_connection(self):
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if self.networking_thread is not None and \
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not self.networking_thread.interrupt or \
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self.new_networking_thread is not None:
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raise InvalidState('There is an existing connection.')
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def _connect(self):
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# Connect a socket to the server and create a file object from the
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# socket.
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# The file object is used to read any and all data from the socket
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# since it's "guaranteed" to read the number of bytes specified,
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# the socket itself will mostly be used to write data upstream to
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# the server.
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self._outgoing_packet_queue = deque()
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info = socket.getaddrinfo(self.options.address, self.options.port,
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0, socket.SOCK_STREAM)
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# Prefer to use IPv4 (for backward compatibility with previous
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# versions that always resolved hostnames to IPv4 addresses),
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# then IPv6, then other address families.
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def key(ai):
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return 0 if ai[0] == socket.AF_INET else \
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1 if ai[0] == socket.AF_INET6 else 2
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ai_faml, ai_type, ai_prot, _ai_cnam, ai_addr = min(info, key=key)
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self.socket = socket.socket(ai_faml, ai_type, ai_prot)
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self.socket.connect(ai_addr)
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self.file_object = self.socket.makefile("rb", 0)
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self.options.compression_enabled = False
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self.options.compression_threshold = -1
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self.connected = True
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def disconnect(self, immediate=False):
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"""Terminate the existing server connection, if there is one.
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If 'immediate' is True, do not attempt to write any packets.
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"""
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with self._write_lock: # pylint: disable=not-context-manager
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self.connected = False
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if not immediate and self.socket is not None:
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# Flush any packets remaining in the queue.
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while self._pop_packet():
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pass
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if self.networking_thread is not None:
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self.networking_thread.interrupt = True
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if self.socket is not None:
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try:
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self.socket.shutdown(socket.SHUT_RDWR)
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except socket.error:
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pass
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finally:
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self.socket.close()
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self.socket = None
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def _handshake(self, next_state=STATE_PLAYING):
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handshake = serverbound.handshake.HandShakePacket()
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handshake.protocol_version = self.context.protocol_version
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handshake.server_address = self.options.address
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handshake.server_port = self.options.port
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handshake.next_state = next_state
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self.write_packet(handshake)
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def _handle_exception(self, exc, exc_info):
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handle_exception = self.handle_exception
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try:
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if self.reactor.handle_exception(exc, exc_info):
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return
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if handle_exception not in (None, False):
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self.handle_exception(exc, exc_info)
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except BaseException as new_exc:
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exc, exc_info = new_exc, sys.exc_info()
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try:
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exc.exc_info = exc_info # For backward compatibility.
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except (TypeError, AttributeError):
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pass
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self.exception, self.exc_info = exc, exc_info
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with self._write_lock:
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if self.networking_thread and not self.networking_thread.interrupt:
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self.disconnect(immediate=True)
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if handle_exception is None:
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raise_(*exc_info)
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def _version_mismatch(self, server_protocol=None, server_version=None):
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if server_protocol is None:
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server_protocol = SUPPORTED_MINECRAFT_VERSIONS.get(server_version)
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if server_protocol is None:
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vs = 'version' if server_version is None else \
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('version of %s' % server_version)
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else:
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vs = ('protocol version of %d' % server_protocol) + \
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('' if server_version is None else ' (%s)' % server_version)
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ss = 'supported, but not allowed for this connection' \
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if server_protocol in SUPPORTED_PROTOCOL_VERSIONS \
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else 'not supported'
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raise VersionMismatch("Server's %s is %s." % (vs, ss))
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def _handle_exit(self):
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if not self.connected and self.handle_exit is not None:
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self.handle_exit()
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def _react(self, packet):
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try:
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for listener in self.early_packet_listeners:
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listener.call_packet(packet)
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self.reactor.react(packet)
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for listener in self.packet_listeners:
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listener.call_packet(packet)
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except IgnorePacket:
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pass
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class NetworkingThread(threading.Thread):
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def __init__(self, connection, previous=None):
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threading.Thread.__init__(self)
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self.interrupt = False
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self.connection = connection
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self.name = "Networking Thread"
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self.daemon = True
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self.previous_thread = previous
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def run(self):
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try:
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if self.previous_thread is not None:
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if self.previous_thread.is_alive():
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self.previous_thread.join()
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with self.connection._write_lock:
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self.connection.networking_thread = self
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self.connection.new_networking_thread = None
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self._run()
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self.connection._handle_exit()
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except BaseException as e:
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self.interrupt = True
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self.connection._handle_exception(e, sys.exc_info())
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finally:
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with self.connection._write_lock:
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self.connection.networking_thread = None
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def _run(self):
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while not self.interrupt:
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# Attempt to write out as many as 300 packets.
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num_packets = 0
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with self.connection._write_lock:
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try:
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while not self.interrupt and self.connection._pop_packet():
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num_packets += 1
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if num_packets >= 300:
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break
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exc_info = None
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except IOError:
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exc_info = sys.exc_info()
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# If any packets remain to be written, resume writing as soon
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# as possible after reading any available packets; otherwise,
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# wait for up to 50ms (1 tick) for new packets to arrive.
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if self.connection._outgoing_packet_queue:
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read_timeout = 0
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else:
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read_timeout = 0.05
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# Read and react to as many as 50 packets.
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while num_packets < 50 and not self.interrupt:
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packet = self.connection.reactor.read_packet(
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self.connection.file_object, timeout=read_timeout)
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if not packet:
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break
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num_packets += 1
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self.connection._react(packet)
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read_timeout = 0
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# Ignore the earlier exception if a disconnect packet is
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# received, as it may have been caused by trying to write to
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# the closed socket, which does not represent a program error.
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if exc_info is not None and packet.packet_name == "disconnect":
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exc_info = None
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if exc_info is not None:
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raise_(*exc_info)
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class PacketReactor(object):
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"""
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Reads and reacts to packets
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|
"""
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state_name = None
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|
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# Handshaking is considered the "default" state
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get_clientbound_packets = staticmethod(clientbound.handshake.get_packets)
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|
|
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def __init__(self, connection):
|
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self.connection = connection
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context = self.connection.context
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self.clientbound_packets = {
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packet.get_id(context): packet
|
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for packet in self.__class__.get_clientbound_packets(context)}
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|
|
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def read_packet(self, stream, timeout=0):
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# Block for up to `timeout' seconds waiting for `stream' to become
|
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# readable, returning `None' if the timeout elapses.
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ready_to_read = select.select([stream], [], [], timeout)[0]
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if ready_to_read:
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length = VarInt.read(stream)
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|
|
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packet_data = packets.PacketBuffer()
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packet_data.send(stream.read(length))
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# Ensure we read all the packet
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while len(packet_data.get_writable()) < length:
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packet_data.send(
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stream.read(length - len(packet_data.get_writable())))
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packet_data.reset_cursor()
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|
|
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if self.connection.options.compression_enabled:
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decompressed_size = VarInt.read(packet_data)
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if decompressed_size > 0:
|
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decompressor = zlib.decompressobj()
|
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decompressed_packet = decompressor.decompress(
|
|
packet_data.read())
|
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assert len(decompressed_packet) == decompressed_size, \
|
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'decompressed length %d, but expected %d' % \
|
|
(len(decompressed_packet), decompressed_size)
|
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packet_data.reset()
|
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packet_data.send(decompressed_packet)
|
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packet_data.reset_cursor()
|
|
|
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packet_id = VarInt.read(packet_data)
|
|
|
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# If we know the structure of the packet, attempt to parse it
|
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# otherwise just skip it
|
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if packet_id in self.clientbound_packets:
|
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packet = self.clientbound_packets[packet_id]()
|
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packet.context = self.connection.context
|
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packet.read(packet_data)
|
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return packet
|
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else:
|
|
return packets.Packet(context=self.connection.context)
|
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else:
|
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return None
|
|
|
|
def react(self, packet):
|
|
"""Called with each incoming packet after early packet listeners are
|
|
run (if none of them raise 'IgnorePacket'), but before regular
|
|
packet listeners are run. If this method raises 'IgnorePacket', no
|
|
subsequent packet listeners will be called for this packet.
|
|
"""
|
|
raise NotImplementedError("Call to base reactor")
|
|
|
|
def handle_exception(self, exc, exc_info):
|
|
"""Called when an exception is raised in the networking thread. If this
|
|
method returns True, the default action will be prevented and the
|
|
exception ignored (but the networking thread will still terminate).
|
|
"""
|
|
return False
|
|
|
|
|
|
class LoginReactor(PacketReactor):
|
|
get_clientbound_packets = staticmethod(clientbound.login.get_packets)
|
|
|
|
def react(self, packet):
|
|
if packet.packet_name == "encryption request":
|
|
|
|
secret = encryption.generate_shared_secret()
|
|
token, encrypted_secret = encryption.encrypt_token_and_secret(
|
|
packet.public_key, packet.verify_token, secret)
|
|
|
|
# A server id of '-' means the server is in offline mode
|
|
if packet.server_id != '-':
|
|
server_id = encryption.generate_verification_hash(
|
|
packet.server_id, secret, packet.public_key)
|
|
if self.connection.auth_token is not None:
|
|
self.connection.auth_token.join(server_id)
|
|
|
|
encryption_response = serverbound.login.EncryptionResponsePacket()
|
|
encryption_response.shared_secret = encrypted_secret
|
|
encryption_response.verify_token = token
|
|
|
|
# Forced because we'll have encrypted the connection by the time
|
|
# it reaches the outgoing queue
|
|
self.connection.write_packet(encryption_response, force=True)
|
|
|
|
# Enable the encryption
|
|
cipher = encryption.create_AES_cipher(secret)
|
|
encryptor = cipher.encryptor()
|
|
decryptor = cipher.decryptor()
|
|
self.connection.socket = encryption.EncryptedSocketWrapper(
|
|
self.connection.socket, encryptor, decryptor)
|
|
self.connection.file_object = \
|
|
encryption.EncryptedFileObjectWrapper(
|
|
self.connection.file_object, decryptor)
|
|
|
|
elif packet.packet_name == "disconnect":
|
|
# Receiving a disconnect packet in the login state indicates an
|
|
# abnormal condition. Raise an exception explaining the situation.
|
|
try:
|
|
msg = json.loads(packet.json_data)['text']
|
|
except (ValueError, TypeError, KeyError):
|
|
msg = packet.json_data
|
|
match = re.match(r"Outdated (client! Please use|server!"
|
|
r" I'm still on) (?P<ver>\S+)$", msg)
|
|
if match:
|
|
ver = match.group('ver')
|
|
self.connection._version_mismatch(server_version=ver)
|
|
raise LoginDisconnect('The server rejected our login attempt '
|
|
'with: "%s".' % msg)
|
|
|
|
elif packet.packet_name == "login success":
|
|
self.connection.reactor = PlayingReactor(self.connection)
|
|
|
|
elif packet.packet_name == "set compression":
|
|
self.connection.options.compression_threshold = packet.threshold
|
|
self.connection.options.compression_enabled = True
|
|
|
|
elif packet.packet_name == "login plugin request":
|
|
self.connection.write_packet(
|
|
serverbound.login.PluginResponsePacket(
|
|
message_id=packet.message_id, successful=False))
|
|
|
|
|
|
class PlayingReactor(PacketReactor):
|
|
get_clientbound_packets = staticmethod(clientbound.play.get_packets)
|
|
|
|
def react(self, packet):
|
|
if packet.packet_name == "set compression":
|
|
self.connection.options.compression_threshold = packet.threshold
|
|
self.connection.options.compression_enabled = True
|
|
|
|
elif packet.packet_name == "keep alive":
|
|
keep_alive_packet = serverbound.play.KeepAlivePacket()
|
|
keep_alive_packet.keep_alive_id = packet.keep_alive_id
|
|
self.connection.write_packet(keep_alive_packet)
|
|
|
|
elif packet.packet_name == "player position and look":
|
|
if self.connection.context.protocol_version >= 107:
|
|
teleport_confirm = serverbound.play.TeleportConfirmPacket()
|
|
teleport_confirm.teleport_id = packet.teleport_id
|
|
self.connection.write_packet(teleport_confirm)
|
|
else:
|
|
position_response = serverbound.play.PositionAndLookPacket()
|
|
position_response.x = packet.x
|
|
position_response.feet_y = packet.y
|
|
position_response.z = packet.z
|
|
position_response.yaw = packet.yaw
|
|
position_response.pitch = packet.pitch
|
|
position_response.on_ground = True
|
|
self.connection.write_packet(position_response)
|
|
self.connection.spawned = True
|
|
|
|
elif packet.packet_name == "disconnect":
|
|
self.connection.disconnect()
|
|
|
|
|
|
class StatusReactor(PacketReactor):
|
|
get_clientbound_packets = staticmethod(clientbound.status.get_packets)
|
|
|
|
def __init__(self, connection, do_ping=False):
|
|
super(StatusReactor, self).__init__(connection)
|
|
self.do_ping = do_ping
|
|
|
|
def react(self, packet):
|
|
if packet.packet_name == "response":
|
|
status_dict = json.loads(packet.json_response)
|
|
if self.do_ping:
|
|
ping_packet = serverbound.status.PingPacket()
|
|
# NOTE: it may be better to depend on the `monotonic' package
|
|
# or something similar for more accurate time measurement.
|
|
ping_packet.time = int(1000 * timeit.default_timer())
|
|
self.connection.write_packet(ping_packet)
|
|
else:
|
|
self.connection.disconnect()
|
|
self.handle_status(status_dict)
|
|
|
|
elif packet.packet_name == "ping":
|
|
if self.do_ping:
|
|
now = int(1000 * timeit.default_timer())
|
|
self.connection.disconnect()
|
|
self.handle_ping(now - packet.time)
|
|
|
|
def handle_status(self, status_dict):
|
|
print(status_dict)
|
|
|
|
def handle_ping(self, latency_ms):
|
|
print('Ping: %d ms' % latency_ms)
|
|
|
|
|
|
class PlayingStatusReactor(StatusReactor):
|
|
def __init__(self, connection):
|
|
super(PlayingStatusReactor, self).__init__(connection, do_ping=False)
|
|
|
|
def handle_status(self, status):
|
|
if status == {}:
|
|
# This can occur when we connect to a Mojang server while it is
|
|
# still initialising, so it must not cause the client to connect
|
|
# with the default version.
|
|
raise IOError('Invalid server status.')
|
|
elif 'version' not in status or 'protocol' not in status['version']:
|
|
return self.handle_failure()
|
|
|
|
proto = status['version']['protocol']
|
|
if proto not in self.connection.allowed_proto_versions:
|
|
self.connection._version_mismatch(
|
|
server_protocol=proto,
|
|
server_version=status['version'].get('name'))
|
|
|
|
self.handle_proto_version(proto)
|
|
|
|
def handle_proto_version(self, proto_version):
|
|
self.connection.allowed_proto_versions = {proto_version}
|
|
self.connection.connect()
|
|
|
|
def handle_failure(self):
|
|
self.handle_proto_version(self.connection.default_proto_version)
|
|
|
|
def handle_exception(self, exc, exc_info):
|
|
if isinstance(exc, EOFError):
|
|
# An exception of this type may indicate that the server does not
|
|
# properly support status queries, so we treat it as non-fatal.
|
|
self.connection.disconnect(immediate=True)
|
|
self.handle_failure()
|
|
return True
|