477 lines
19 KiB
Python
477 lines
19 KiB
Python
# -*- coding: utf-8 -*-
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"""The logic and behaviour of a single connection"""
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import base64
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import errno
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import logging
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import random
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import select
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import socket
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import ssl
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import threading
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import queue
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import time
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from . import message, shared, structure
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class Connection(threading.Thread):
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"""The connection object"""
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def __init__(
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self, host, port, s=None, network='ip', server=False,
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i2p_remote_dest=b''
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):
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self.host = host
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self.port = port
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self.network = network
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self.i2p_remote_dest = i2p_remote_dest
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if self.network == 'i2p':
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self.host_print = self.i2p_remote_dest[:8].decode()
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else:
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self.host_print = self.host
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super().__init__(name='Connection to {}:{}'.format(host, port))
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self.send_queue = queue.Queue()
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self.vectors_to_get = set()
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self.vectors_to_send = set()
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self.vectors_requested = dict()
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self.status = 'ready'
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self.tls = False
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self.verack_received = False
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self.verack_sent = False
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self.s = s
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self.remote_version = None
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self.server = server
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if bool(s):
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self.status = 'connected'
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self.buffer_receive = b''
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self.buffer_send = b''
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self.next_message_size = shared.header_length
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self.next_header = True
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self.on_connection_fully_established_scheduled = False
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self.last_message_received = time.time()
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self.last_message_sent = time.time()
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def run(self):
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if self.s is None:
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self._connect()
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if self.status != 'connected':
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return
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self.s.settimeout(0)
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if not self.server:
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if self.network == 'ip':
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self.send_queue.put(message.Version(self.host, self.port))
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else:
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self.send_queue.put(message.Version('127.0.0.1', 7656))
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while True:
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if (
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self.on_connection_fully_established_scheduled
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and not (self.buffer_send or self.buffer_receive)
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):
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self._on_connection_fully_established()
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data = True
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try:
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if self.status == 'fully_established':
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data = self.s.recv(4096)
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self.buffer_receive += data
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if data and len(self.buffer_receive) < 4000000:
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continue
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else:
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data = self.s.recv(
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self.next_message_size - len(self.buffer_receive))
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self.buffer_receive += data
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except ssl.SSLWantReadError:
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if self.status == 'fully_established':
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self._request_objects()
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self._send_objects()
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except socket.error as e:
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err = e.args[0]
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if err in (errno.EAGAIN, errno.EWOULDBLOCK):
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if self.status == 'fully_established':
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self._request_objects()
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self._send_objects()
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else:
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logging.debug(
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'Disconnecting from %s:%s. Reason: %s',
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self.host_print, self.port, e)
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data = None
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except ConnectionResetError:
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logging.debug(
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'Disconnecting from %s:%s. Reason: ConnectionResetError',
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self.host_print, self.port)
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self.status = 'disconnecting'
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self._process_buffer_receive()
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self._process_queue()
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self._send_data()
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if time.time() - self.last_message_received > shared.timeout:
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logging.debug(
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'Disconnecting from %s:%s. Reason:'
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' time.time() - self.last_message_received'
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' > shared.timeout', self.host_print, self.port)
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self.status = 'disconnecting'
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if (
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time.time() - self.last_message_received > 30
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and self.status != 'fully_established'
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and self.status != 'disconnecting'
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):
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logging.debug(
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'Disconnecting from %s:%s. Reason:'
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' time.time() - self.last_message_received > 30'
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' and self.status != "fully_established"',
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self.host_print, self.port)
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self.status = 'disconnecting'
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if (
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time.time() - self.last_message_sent > 300
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and self.status == 'fully_established'
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):
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self.send_queue.put(message.Message(b'pong', b''))
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if self.status == 'disconnecting' or shared.shutting_down:
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data = None
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if not data:
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self.status = 'disconnected'
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self.s.close()
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logging.debug(
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'Disconnected from %s:%s', self.host_print, self.port)
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break
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time.sleep(0.2)
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def _connect(self):
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peer_str = '{0.host_print}:{0.port}'.format(self)
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logging.debug('Connecting to %s', peer_str)
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try:
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self.s = socket.create_connection((self.host, self.port), 10)
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self.status = 'connected'
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logging.debug('Established TCP connection to %s', peer_str)
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except socket.timeout:
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pass
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except OSError as e:
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# unreachable, refused, no route
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(logging.info if e.errno not in (101, 111, 113)
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else logging.debug)(
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'Connection to %s failed. Reason: %s', peer_str, e)
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except Exception:
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logging.info(
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'Connection to %s failed.', peer_str, exc_info=True)
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if self.status != 'connected':
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self.status = 'failed'
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def _send_data(self):
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if self.buffer_send and self:
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try:
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amount = self.s.send(self.buffer_send)
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self.buffer_send = self.buffer_send[amount:]
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except (BlockingIOError, ssl.SSLWantWriteError):
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pass
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except (
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BrokenPipeError, ConnectionResetError, ssl.SSLError, OSError
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) as e:
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logging.debug(
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'Disconnecting from %s:%s. Reason: %s',
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self.host_print, self.port, e)
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self.status = 'disconnecting'
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def _do_tls_handshake(self):
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logging.debug(
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'Initializing TLS connection with %s:%s',
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self.host_print, self.port)
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context = ssl.create_default_context()
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context.check_hostname = False
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context.verify_mode = ssl.CERT_NONE
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if (
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ssl.OPENSSL_VERSION_NUMBER >= 0x10100000
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and not ssl.OPENSSL_VERSION.startswith("LibreSSL")
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): # OpenSSL>=1.1
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context.set_ciphers('AECDH-AES256-SHA@SECLEVEL=0')
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else:
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context.set_ciphers('AECDH-AES256-SHA')
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context.set_ecdh_curve("secp256k1")
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context.options = (
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ssl.OP_ALL | ssl.OP_NO_SSLv2 | ssl.OP_NO_SSLv3
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| ssl.OP_SINGLE_ECDH_USE | ssl.OP_CIPHER_SERVER_PREFERENCE)
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self.s = context.wrap_socket(
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self.s, server_side=self.server, do_handshake_on_connect=False)
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while True:
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try:
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self.s.do_handshake()
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break
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except ssl.SSLWantReadError:
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select.select([self.s], [], [])
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except ssl.SSLWantWriteError:
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select.select([], [self.s], [])
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except Exception as e:
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logging.debug(
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'Disconnecting from %s:%s. Reason: %s',
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self.host_print, self.port, e)
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self.status = 'disconnecting'
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break
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self.tls = True
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logging.debug(
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'Established TLS connection with %s:%s',
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self.host_print, self.port)
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def _send_message(self, m):
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if isinstance(m, message.Message) and m.command == b'object':
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logging.debug(
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'%s:%s <- %s',
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self.host_print, self.port, structure.Object.from_message(m))
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else:
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logging.debug('%s:%s <- %s', self.host_print, self.port, m)
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self.buffer_send += m.to_bytes()
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def _on_connection_fully_established(self):
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logging.info(
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'Established Bitmessage protocol connection to %s:%s',
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self.host_print, self.port)
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self.on_connection_fully_established_scheduled = False
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if self.remote_version.services & 2 and self.network == 'ip':
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self._do_tls_handshake() # NODE_SSL
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addr = {
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structure.NetAddr(c.remote_version.services, c.host, c.port)
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for c in shared.connections if c.network != 'i2p'
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and c.server is False and c.status == 'fully_established'}
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if len(shared.node_pool) > 10:
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addr.update({
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structure.NetAddr(1, a[0], a[1])
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for a in random.sample(shared.node_pool, 10)})
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if len(shared.unchecked_node_pool) > 10:
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addr.update({
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structure.NetAddr(1, a[0], a[1])
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for a in random.sample(shared.unchecked_node_pool, 10)})
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if len(addr) != 0:
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self.send_queue.put(message.Addr(addr))
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with shared.objects_lock:
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if len(shared.objects) > 0:
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to_send = {
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vector for vector in shared.objects.keys()
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if shared.objects[vector].expires_time > time.time()}
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while len(to_send) > 0:
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if len(to_send) > 10000:
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# We limit size of inv messaged to 10000 entries
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# because they might time out
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# in very slow networks (I2P)
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pack = random.sample(to_send, 10000)
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self.send_queue.put(message.Inv(pack))
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to_send.difference_update(pack)
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else:
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self.send_queue.put(message.Inv(to_send))
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to_send.clear()
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self.status = 'fully_established'
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def _process_queue(self):
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while not self.send_queue.empty():
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m = self.send_queue.get()
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if m:
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if m == 'fully_established':
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self.on_connection_fully_established_scheduled = True
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else:
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self._send_message(m)
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self.last_message_sent = time.time()
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else:
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self.status = 'disconnecting'
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break
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def _process_buffer_receive(self):
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while len(self.buffer_receive) >= self.next_message_size:
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if self.next_header:
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self.next_header = False
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try:
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h = message.Header.from_bytes(
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self.buffer_receive[:shared.header_length])
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except ValueError as e:
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self.status = 'disconnecting'
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logging.warning(
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'Received malformed message from %s:%s: %s',
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self.host_print, self.port, e)
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break
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self.next_message_size += h.payload_length
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else:
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try:
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m = message.Message.from_bytes(
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self.buffer_receive[:self.next_message_size])
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except ValueError as e:
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self.status = 'disconnecting'
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logging.warning(
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'Received malformed message from %s:%s, %s',
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self.host_print, self.port, e)
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break
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self.next_header = True
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self.buffer_receive = self.buffer_receive[
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self.next_message_size:]
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self.next_message_size = shared.header_length
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self.last_message_received = time.time()
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try:
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self._process_message(m)
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except ValueError as e:
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self.status = 'disconnecting'
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logging.warning(
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'Received malformed message from %s:%s: %s',
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self.host_print, self.port, e)
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break
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def _process_message(self, m):
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if m.command == b'version':
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version = message.Version.from_bytes(m.to_bytes())
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logging.debug('%s:%s -> %s', self.host_print, self.port, version)
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if (
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version.protocol_version != shared.protocol_version
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or version.nonce == shared.nonce
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):
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self.status = 'disconnecting'
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self.send_queue.put(None)
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else:
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logging.info(
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'%s:%s claims to be %s',
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self.host_print, self.port, version.user_agent)
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self.send_queue.put(message.Message(b'verack', b''))
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self.verack_sent = True
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self.remote_version = version
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if not self.server:
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self.send_queue.put('fully_established')
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if self.network == 'ip':
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shared.address_advertise_queue.put(structure.NetAddr(
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version.services, self.host, self.port))
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shared.node_pool.add((self.host, self.port))
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elif self.network == 'i2p':
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shared.i2p_node_pool.add((self.host, 'i2p'))
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if self.network == 'ip':
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shared.address_advertise_queue.put(structure.NetAddr(
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shared.services, version.host, shared.listening_port))
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if self.server:
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if self.network == 'ip':
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self.send_queue.put(
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message.Version(self.host, self.port))
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else:
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self.send_queue.put(message.Version('127.0.0.1', 7656))
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elif m.command == b'verack':
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self.verack_received = True
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logging.debug(
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'%s:%s -> %s', self.host_print, self.port, 'verack')
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if self.server:
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self.send_queue.put('fully_established')
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elif m.command == b'inv':
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inv = message.Inv.from_message(m)
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logging.debug('%s:%s -> %s', self.host_print, self.port, inv)
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to_get = inv.vectors.copy()
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to_get.difference_update(shared.objects.keys())
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self.vectors_to_get.update(to_get)
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# Do not send objects they already have.
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self.vectors_to_send.difference_update(inv.vectors)
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elif m.command == b'object':
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obj = structure.Object.from_message(m)
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logging.debug('%s:%s -> %s', self.host_print, self.port, obj)
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self.vectors_requested.pop(obj.vector, None)
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self.vectors_to_get.discard(obj.vector)
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if obj.is_valid() and obj.vector not in shared.objects:
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with shared.objects_lock:
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shared.objects[obj.vector] = obj
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if (
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obj.object_type == shared.i2p_dest_obj_type
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and obj.version == shared.i2p_dest_obj_version
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):
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dest = base64.b64encode(obj.object_payload, altchars=b'-~')
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logging.debug(
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'Received I2P destination object,'
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' adding to i2p_unchecked_node_pool')
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logging.debug(dest)
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shared.i2p_unchecked_node_pool.add((dest, 'i2p'))
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shared.vector_advertise_queue.put(obj.vector)
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elif m.command == b'getdata':
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getdata = message.GetData.from_message(m)
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logging.debug('%s:%s -> %s', self.host_print, self.port, getdata)
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self.vectors_to_send.update(getdata.vectors)
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elif m.command == b'addr':
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addr = message.Addr.from_message(m)
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logging.debug('%s:%s -> %s', self.host_print, self.port, addr)
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for a in addr.addresses:
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shared.unchecked_node_pool.add((a.host, a.port))
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elif m.command == b'ping':
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logging.debug('%s:%s -> ping', self.host_print, self.port)
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self.send_queue.put(message.Message(b'pong', b''))
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elif m.command == b'error':
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logging.warning(
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'%s:%s -> error: %s', self.host_print, self.port, m.payload)
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else:
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logging.debug('%s:%s -> %s', self.host_print, self.port, m)
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def _request_objects(self):
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if self.vectors_to_get and len(self.vectors_requested) < 100:
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self.vectors_to_get.difference_update(shared.objects.keys())
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if self.vectors_to_get:
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logging.info(
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'Queued %s vectors to get', len(self.vectors_to_get))
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if len(self.vectors_to_get) > 64:
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pack = random.sample(self.vectors_to_get, 64)
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self.send_queue.put(message.GetData(pack))
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self.vectors_requested.update({
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vector: time.time() for vector in pack
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if vector not in self.vectors_requested})
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self.vectors_to_get.difference_update(pack)
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else:
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self.send_queue.put(message.GetData(self.vectors_to_get))
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self.vectors_requested.update({
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vector: time.time() for vector in self.vectors_to_get
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if vector not in self.vectors_requested})
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self.vectors_to_get.clear()
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if self.vectors_requested:
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self.vectors_requested = {
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vector: t for vector, t in self.vectors_requested.items()
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if vector not in shared.objects and t > time.time() - 15 * 60}
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to_re_request = {
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vector for vector, t in self.vectors_requested.items()
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if t < time.time() - 10 * 60}
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if to_re_request:
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self.vectors_to_get.update(to_re_request)
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logging.info(
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'Re-requesting %i objects from %s:%s',
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len(to_re_request), self.host_print, self.port)
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def _send_objects(self):
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if self.vectors_to_send:
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logging.info(
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'Preparing to send %s objects', len(self.vectors_to_send))
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if len(self.vectors_to_send) > 16:
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to_send = random.sample(self.vectors_to_send, 16)
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self.vectors_to_send.difference_update(to_send)
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else:
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to_send = self.vectors_to_send.copy()
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self.vectors_to_send.clear()
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with shared.objects_lock:
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for vector in to_send:
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obj = shared.objects.get(vector, None)
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if obj:
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self.send_queue.put(
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message.Message(b'object', obj.to_bytes()))
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shared.connection = Connection
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