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