373 lines
17 KiB
Python
373 lines
17 KiB
Python
# -*- coding: utf-8 -*-
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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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def __init__(self, host, port, s=None, network='ip', server=False, i2p_remote_dest=b''):
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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 self.on_connection_fully_established_scheduled and not (self.buffer_send or self.buffer_receive):
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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(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 == errno.EAGAIN or err == 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('Disconnecting from {}:{}. Reason: {}'.format(self.host_print, self.port, e))
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data = None
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except ConnectionResetError:
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logging.debug('Disconnecting from {}:{}. Reason: ConnectionResetError'.format(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 {}:{}. Reason: time.time() - self.last_message_received > shared.timeout'.format(
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self.host_print, self.port))
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self.status = 'disconnecting'
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if time.time() - self.last_message_received > 30 and self.status != 'fully_established'and self.status != 'disconnecting':
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logging.debug(
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'Disconnecting from {}:{}. Reason: time.time() - self.last_message_received > 30 and self.status != \'fully_established\''.format(
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self.host_print, self.port))
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self.status = 'disconnecting'
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if time.time() - self.last_message_sent > 300 and self.status == 'fully_established':
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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.info('Disconnected from {}:{}'.format(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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logging.debug('Connecting to {}:{}'.format(self.host_print, self.port))
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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.info('Established TCP connection to {}:{}'.format(self.host_print, self.port))
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except Exception as e:
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logging.warning('Connection to {}:{} failed. Reason: {}'.format(self.host_print, self.port, e))
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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 (BrokenPipeError, ConnectionResetError, ssl.SSLError, OSError) as e:
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logging.debug('Disconnecting from {}:{}. Reason: {}'.format(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('Initializing TLS connection with {}:{}'.format(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 ssl.OPENSSL_VERSION_NUMBER >= 0x10100000 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 = ssl.OP_ALL | ssl.OP_NO_SSLv2 | ssl.OP_NO_SSLv3 | ssl.OP_SINGLE_ECDH_USE | ssl.OP_CIPHER_SERVER_PREFERENCE
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self.s = context.wrap_socket(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('Disconnecting from {}:{}. Reason: {}'.format(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('Established TLS connection with {}:{}'.format(self.host_print, self.port))
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def _send_message(self, m):
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if type(m) == message.Message and m.command == b'object':
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logging.debug('{}:{} <- {}'.format(self.host_print, self.port, structure.Object.from_message(m)))
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else:
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logging.debug('{}:{} <- {}'.format(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('Established Bitmessage protocol connection to {}:{}'.format(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': # NODE_SSL
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self._do_tls_handshake()
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addr = {structure.NetAddr(c.remote_version.services, c.host, c.port) for c in shared.connections if c.network != 'i2p' 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({structure.NetAddr(1, a[0], a[1]) 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({structure.NetAddr(1, a[0], a[1]) 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 = {vector for vector in shared.objects.keys() 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 because they might time out 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(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('Received malformed message from {}:{}: {}'.format(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(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('Received malformed message from {}:{}, {}'.format(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[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('Received malformed message from {}:{}: {}'.format(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('{}:{} -> {}'.format(self.host_print, self.port, str(version)))
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if version.protocol_version != shared.protocol_version or version.nonce == shared.nonce:
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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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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(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(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(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('{}:{} -> {}'.format(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('{}:{} -> {}'.format(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('{}:{} -> {}'.format(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 obj.object_type == shared.i2p_dest_obj_type and obj.version == shared.i2p_dest_obj_version:
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dest = base64.b64encode(obj.object_payload, altchars=b'-~')
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logging.debug('Received I2P destination object, 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('{}:{} -> {}'.format(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('{}:{} -> {}'.format(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('{}:{} -> ping'.format(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.error('{}:{} -> error: {}'.format(self.host_print, self.port, m.payload))
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else:
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logging.debug('{}:{} -> {}'.format(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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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({vector: time.time() for vector in pack 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({vector: time.time() for vector in self.vectors_to_get 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 = {vector: t for vector, t in self.vectors_requested.items() if vector not in shared.objects and t > time.time() - 15 * 60}
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to_re_request = {vector for vector, t in self.vectors_requested.items() 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.debug('Re-requesting {} objects from {}:{}'.format(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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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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