MiNode/minode/connection.py

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# -*- coding: utf-8 -*-
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"""The logic and behaviour of a single connection"""
import base64
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import errno
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import logging
import math
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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
import queue
import time
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from . import message, shared, structure
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class ConnectionBase(threading.Thread):
"""
Common code for the connection thread
with minimum command handlers to reuse
"""
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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
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
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super().__init__(name='Connection to {}:{}'.format(host, port))
self.send_queue = queue.Queue()
self.vectors_to_get = set()
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self.vectors_to_send = set()
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self.vectors_requested = {}
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self.status = 'ready'
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self.tls = False
self.verack_received = False
self.verack_sent = False
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self.s = s
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''
self.buffer_send = b''
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self.next_message_size = shared.header_length
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()
self.last_message_sent = time.time()
self.wait_until = 0
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def run(self):
if self.s is None:
self._connect()
if self.status != 'connected':
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':
self.send_queue.put(message.Version(self.host, self.port))
else:
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
try:
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if self.status == 'fully_established':
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data = self.s.recv(4096)
self.buffer_receive += data
if data and len(self.buffer_receive) < 4000000:
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':
self._request_objects()
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self._send_objects()
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except socket.error as e:
err = e.args[0]
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if err in (errno.EAGAIN, errno.EWOULDBLOCK):
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if self.status == 'fully_established':
self._request_objects()
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self._send_objects()
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else:
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logging.debug(
'Disconnecting from %s:%s. Reason: %s',
self.host_print, self.port, e)
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data = None
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self._process_buffer_receive()
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self._process_queue()
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self._send_data()
if time.time() - self.last_message_received > shared.timeout:
logging.debug(
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'Disconnecting from %s:%s. Reason:'
' time.time() - self.last_message_received'
' > shared.timeout', 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 %s:%s. Reason:'
' time.time() - self.last_message_received > 30'
' and self.status != "fully_established"',
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'
):
self.send_queue.put(message.Message(b'ping', b''))
if self.status == 'disconnecting' or shared.shutting_down:
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data = None
if not data:
self.status = 'disconnected'
self.s.close()
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logging.info(
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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):
peer_str = '{0.host_print}:{0.port}'.format(self)
logging.debug('Connecting to %s', peer_str)
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try:
self.s = socket.create_connection((self.host, self.port), 10)
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self.status = 'connected'
logging.debug('Established TCP connection to %s', peer_str)
except socket.timeout:
pass
except OSError as e:
# unreachable, refused, no route
(logging.info if e.errno not in (101, 111, 113)
else logging.debug)(
'Connection to %s failed. Reason: %s', peer_str, e)
except Exception:
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logging.info(
'Connection to %s failed.', peer_str, exc_info=True)
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:
amount = self.s.send(self.buffer_send)
self.buffer_send = self.buffer_send[amount:]
except (BlockingIOError, ssl.SSLWantWriteError):
pass
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except (
BrokenPipeError, ConnectionResetError, ssl.SSLError, OSError
) as e:
logging.debug(
'Disconnecting from %s:%s. Reason: %s',
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 %s:%s',
self.host_print, self.port)
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context = ssl.create_default_context(
purpose=ssl.Purpose.CLIENT_AUTH if self.server
else ssl.Purpose.SERVER_AUTH
)
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context.check_hostname = False
context.verify_mode = ssl.CERT_NONE
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if (
ssl.OPENSSL_VERSION_NUMBER >= 0x10100000
and not ssl.OPENSSL_VERSION.startswith("LibreSSL")
): # OpenSSL>=1.1
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context.set_ciphers('AECDH-AES256-SHA@SECLEVEL=0')
else:
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)
# OP_NO_SSL* is deprecated since 3.6
try:
# TODO: ssl.TLSVersion.TLSv1 is deprecated
context.minimum_version = ssl.TLSVersion.TLSv1
context.maximum_version = ssl.TLSVersion.TLSv1_2
except AttributeError:
pass
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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:
try:
self.s.do_handshake()
break
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except ssl.SSLWantReadError:
select.select([self.s], [], [])
except ssl.SSLWantWriteError:
select.select([], [self.s], [])
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except Exception as e:
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logging.debug(
'Disconnecting from %s:%s. Reason: %s',
self.host_print, self.port, e)
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self.status = 'disconnecting'
if isinstance(e, ssl.SSLError): # pylint: disable=no-member
logging.debug('ssl.SSLError reason: %s', e.reason)
shared.node_pool.discard((self.host, self.port))
return
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self.tls = True
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logging.debug(
'Established TLS connection with %s:%s (%s)',
self.host_print, self.port, self.s.version())
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def _send_message(self, m):
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if isinstance(m, message.Message) and m.command == b'object':
logging.debug(
'%s:%s <- %s',
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(
'Established Bitmessage protocol connection to %s:%s',
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':
self._do_tls_handshake() # NODE_SSL
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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'}
# pylint: disable=unsubscriptable-object
# https://github.com/pylint-dev/pylint/issues/3637
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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(tuple(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(tuple(shared.unchecked_node_pool), 10)})
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if len(addr) != 0:
self.send_queue.put(message.Addr(addr))
if len(shared.objects) > 0:
to_send = shared.objects.vectors_to_send()
offset = 0
while offset < len(to_send):
# We limit size of inv messaged to 10000 entries
# because they might time out
# in very slow networks (I2P)
self.send_queue.put(message.Inv(to_send[offset:offset+10000]))
offset += 10000
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self.status = 'fully_established'
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def _process_queue(self):
while not self.send_queue.empty():
m = self.send_queue.get()
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:
self._send_message(m)
self.last_message_sent = time.time()
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else:
self.status = 'disconnecting'
break
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def _process_buffer_receive(self):
while len(self.buffer_receive) >= self.next_message_size:
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if self.next_header:
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:
self.status = 'disconnecting'
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logging.warning(
'Received malformed message from %s:%s: %s',
self.host_print, self.port, e)
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break
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self.next_message_size += h.payload_length
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:
self.status = 'disconnecting'
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logging.warning(
'Received malformed message from %s:%s, %s',
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
self.last_message_received = time.time()
try:
self._process_message(m)
except ValueError as e:
self.status = 'disconnecting'
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logging.warning(
'Received malformed message from %s:%s: %s',
self.host_print, self.port, e)
break
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def _process_message(self, m):
if m.command == b'verack':
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self.verack_received = True
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logging.debug(
'%s:%s -> %s', self.host_print, self.port, 'verack')
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if self.server:
self.send_queue.put('fully_established')
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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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error = message.Error.from_message(m)
logging.warning(
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'%s:%s -> %s', self.host_print, self.port, error)
if error.fatal == 2:
# reduce probability to connect soon
shared.unchecked_node_pool.discard((self.host, self.port))
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else:
try:
getattr(self, '_process_msg_{}'.format(m.command.decode()))(m)
except (AttributeError, UnicodeDecodeError):
logging.debug('%s:%s -> %s', self.host_print, self.port, m)
def _process_msg_version(self, m):
version = message.Version.from_message(m)
if shared.stream not in version.streams:
raise ValueError('message not for stream %i' % shared.stream)
logging.debug('%s:%s -> %s', self.host_print, self.port, version)
if (
version.protocol_version != shared.protocol_version
or version.nonce == shared.nonce
):
self.status = 'disconnecting'
self.send_queue.put(None)
else:
logging.info(
'%s:%s claims to be %s',
self.host_print, self.port, version.user_agent)
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'))
if self.network == 'ip':
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))
def _process_msg_addr(self, m):
addr = message.Addr.from_message(m)
logging.debug('%s:%s -> %s', self.host_print, self.port, addr)
for a in addr.addresses:
shared.unchecked_node_pool.add((a.host, a.port))
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def _request_objects(self):
if self.vectors_to_get and len(self.vectors_requested) < 100:
self.vectors_to_get = shared.objects.select(self.vectors_to_get)
if not self.wait_until:
nodes_count = (
len(shared.node_pool) + len(shared.unchecked_node_pool))
logging.debug('Nodes count is %i', nodes_count)
delay = math.ceil(math.log(nodes_count + 2, 20)) * 5.2
self.wait_until = time.time() + delay
logging.debug('Skip sending getdata for %.2fs', delay)
if self.vectors_to_get and self.wait_until < time.time():
logging.info(
'Queued %s vectors to get', len(self.vectors_to_get))
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if len(self.vectors_to_get) > 64:
pack = random.sample(tuple(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)
else:
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()
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}
to_re_request = {
vector for vector, t in self.vectors_requested.items()
if t < time.time() - 10 * 60}
if to_re_request:
self.vectors_to_get.update(to_re_request)
logging.info(
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'Re-requesting %i objects from %s:%s',
len(to_re_request), self.host_print, self.port)
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def _send_objects(self):
if self.vectors_to_send:
logging.info(
'Preparing to send %s objects', len(self.vectors_to_send))
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if len(self.vectors_to_send) > 16:
to_send = random.sample(tuple(self.vectors_to_send), 16)
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self.vectors_to_send.difference_update(to_send)
else:
to_send = self.vectors_to_send.copy()
self.vectors_to_send.clear()
for vector in to_send:
obj = shared.objects.get(vector)
if obj:
self.send_queue.put(message.Message(b'object', obj.data))
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class Connection(ConnectionBase):
"""The connection with all commands implementation"""
def _process_msg_inv(self, m):
inv = message.Inv.from_message(m)
logging.debug('%s:%s -> %s', self.host_print, self.port, inv)
self.vectors_to_get.update(shared.objects.select(inv.vectors))
# Do not send objects they already have.
self.vectors_to_send.difference_update(inv.vectors)
def _process_msg_object(self, m):
obj = structure.Object.from_message(m)
logging.debug('%s:%s -> %s', self.host_print, self.port, obj)
self.vectors_requested.pop(obj.vector, None)
self.vectors_to_get.discard(obj.vector)
if obj.is_valid():
shared.objects[obj.vector] = obj
if (
obj.object_type == shared.i2p_dest_obj_type
and obj.version == shared.i2p_dest_obj_version
):
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)
def _process_msg_getdata(self, m):
getdata = message.GetData.from_message(m)
logging.debug('%s:%s -> %s', self.host_print, self.port, getdata)
self.vectors_to_send.update(getdata.vectors)
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shared.connection = Connection