243 lines
10 KiB
Python
243 lines
10 KiB
Python
# -*- coding: utf-8 -*-
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import logging
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import os
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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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import message
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import shared
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import structure
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class Connection(threading.Thread):
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def __init__(self, host, port, s=None):
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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.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.host = host
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self.port = int(port)
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self.s = s
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self.remote_version = None
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self.server = bool(s)
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if self.server:
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self.status = 'connected'
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self.buffer = 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.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(0.5)
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if not self.server:
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self.send_queue.put(message.Version(self.host, self.port))
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while True:
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data = True
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try:
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data = self.s.recv(1024)
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self.buffer += data
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except socket.timeout or ssl.SSLError:
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if time.time() - self.last_message_received > shared.timeout:
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logging.debug('Disconnecting from {};{}. Reason: time.time() - self.last_message_received > shared.timeout'.format(self.host, self.port))
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data = None
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if time.time() - self.last_message_received > 30 and self.status != 'fully_established':
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logging.debug('Disconnecting from {};{}. Reason: time.time() - self.last_message_received > 30 and self.status != \'fully_established\''.format(self.host, self.port))
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data = None
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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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except ConnectionResetError:
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logging.debug('Disconnecting from {};{}. Reason: ConnectionResetError'.format(self.host, self.port))
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data = None
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self._process_buffer()
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self._request_objects()
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self._process_queue()
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if self.status == 'disconnecting':
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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, self.port))
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break
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def _connect(self):
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logging.info('Connecting to {}:{}'.format(self.host, self.port))
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try:
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self.s = socket.create_connection((self.host, self.port))
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self.status = 'connected'
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logging.debug('Established TCP connection to {}:{}'.format(self.host, self.port))
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except Exception as e:
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logging.warning('Connection to {}:{} failed'.format(self.host, self.port))
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logging.warning(e)
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self.status = 'failed'
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def _do_tls_handshake(self):
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self.s.settimeout(30)
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logging.debug('Initializing TLS connection with {}:{}'.format(self.host, self.port))
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self.s = ssl.wrap_socket(self.s, keyfile=os.path.join(shared.source_directory, 'tls', 'key.pem'),
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certfile=os.path.join(shared.source_directory, 'tls', 'cert.pem'),
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server_side=self.server, ssl_version=ssl.PROTOCOL_TLSv1, do_handshake_on_connect=False,
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ciphers='AECDH-AES256-SHA')
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if hasattr(self.s, "context"):
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self.s.context.set_ecdh_curve("secp256k1")
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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.SSLError as e:
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if e.errno == 2:
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select.select([self.s], [self.s], [])
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else:
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break
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except Exception as e:
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print(e)
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break
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self.s.settimeout(0.5)
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self.tls = True
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logging.debug('Established TLS connection with {}:{}'.format(self.host, 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, self.port, structure.Object.from_message(m)))
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else:
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logging.debug('{}:{} <- {}'.format(self.host, self.port, m))
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self.s.settimeout(60)
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self.s.sendall(m.to_bytes())
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self.s.settimeout(0.5)
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def _on_connection_fully_established(self):
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self.status = 'fully_established'
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logging.info('Established Bitmessage protocol connection to {}:{}'.format(self.host, self.port))
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if self.remote_version.services & 2: # NODE_SSL
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self._do_tls_handshake()
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with shared.objects_lock:
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self.send_queue.put(message.Inv({vector for vector in shared.objects.keys() if shared.objects[vector].expires_time > time.time()}))
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addr = {structure.NetAddr(1, c.host, c.port) for c in shared.connections.copy() if not c.server and c.status == 'fully_established'}
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if len(addr) != 0:
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self.send_queue.put(message.Addr(addr))
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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()
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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(self):
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while len(self.buffer) >= self.next_message_size:
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if self.next_header:
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self.next_header = False
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h = message.Header.from_bytes(self.buffer[:shared.header_length])
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self.next_message_size += h.payload_length
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else:
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m = message.Message.from_bytes(self.buffer[:self.next_message_size])
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self.next_header = True
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self.buffer = self.buffer[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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self._process_message(m)
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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, 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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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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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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self.send_queue.put(message.Version(self.host, self.port))
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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, 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, 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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to_get.difference_update(shared.requested_objects)
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self.vectors_to_get.update(to_get)
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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, self.port, obj))
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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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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, self.port, getdata))
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for vector in getdata.vectors:
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if vector in shared.objects:
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self.send_queue.put(message.Message(b'object', shared.objects[vector].to_bytes()))
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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, 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, self.port))
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self.send_queue.put(message.Message(b'pong', b''))
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else:
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logging.debug('{}:{} -> {}'.format(self.host, self.port, m))
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def _request_objects(self):
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if self.vectors_to_get:
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if len(self.vectors_to_get) > 50000:
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pack = random.sample(self.vectors_to_get, 50000)
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self.send_queue.put(message.GetData(pack))
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self.vectors_to_get.difference_update(pack)
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if shared.conserve_bandwidth:
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with shared.requested_objects_lock:
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shared.requested_objects.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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if shared.conserve_bandwidth:
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with shared.requested_objects_lock:
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shared.requested_objects.update(self.vectors_to_get)
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self.vectors_to_get.clear()
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