MiNode/minode/connection.py
Lee Miller 58a80bb4a4
Remove unreachable except clause for ConnectionResetError
- handled in socket.error branch. TODO: follow PEP 3151
2023-08-20 01:19:11 +03:00

487 lines
19 KiB
Python

# -*- coding: utf-8 -*-
"""The logic and behaviour of a single connection"""
import base64
import errno
import logging
import math
import random
import select
import socket
import ssl
import threading
import queue
import time
from . import message, shared, structure
class Connection(threading.Thread):
"""The connection object"""
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.vectors_requested = {}
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()
self.wait_until = 0
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 in (errno.EAGAIN, errno.EWOULDBLOCK):
if self.status == 'fully_established':
self._request_objects()
self._send_objects()
else:
logging.debug(
'Disconnecting from %s:%s. Reason: %s',
self.host_print, self.port, e)
data = None
self._process_buffer_receive()
self._process_queue()
self._send_data()
if time.time() - self.last_message_received > shared.timeout:
logging.debug(
'Disconnecting from %s:%s. Reason:'
' time.time() - self.last_message_received'
' > shared.timeout', 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 %s:%s. Reason:'
' time.time() - self.last_message_received > 30'
' and self.status != "fully_established"',
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 %s:%s', self.host_print, self.port)
break
time.sleep(0.2)
def _connect(self):
peer_str = '{0.host_print}:{0.port}'.format(self)
logging.debug('Connecting to %s', peer_str)
try:
self.s = socket.create_connection((self.host, self.port), 10)
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:
logging.info(
'Connection to %s failed.', peer_str, exc_info=True)
if self.status != 'connected':
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, OSError
) as e:
logging.debug(
'Disconnecting from %s:%s. Reason: %s',
self.host_print, self.port, e)
self.status = 'disconnecting'
def _do_tls_handshake(self):
logging.debug(
'Initializing TLS connection with %s:%s',
self.host_print, self.port)
context = ssl.create_default_context(
purpose=ssl.Purpose.CLIENT_AUTH if self.server
else ssl.Purpose.SERVER_AUTH
)
context.check_hostname = False
context.verify_mode = ssl.CERT_NONE
if (
ssl.OPENSSL_VERSION_NUMBER >= 0x10100000
and not ssl.OPENSSL_VERSION.startswith("LibreSSL")
): # OpenSSL>=1.1
context.set_ciphers('AECDH-AES256-SHA@SECLEVEL=0')
else:
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 %s:%s. Reason: %s',
self.host_print, self.port, e)
self.status = 'disconnecting'
break
self.tls = True
logging.debug(
'Established TLS connection with %s:%s',
self.host_print, self.port)
def _send_message(self, m):
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))
else:
logging.debug('%s:%s <- %s', 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 %s:%s',
self.host_print, self.port)
self.on_connection_fully_established_scheduled = False
if self.remote_version.services & 2 and self.network == 'ip':
self._do_tls_handshake() # NODE_SSL
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
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 %s:%s: %s',
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 %s:%s, %s',
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 %s:%s: %s',
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('%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))
elif m.command == b'verack':
self.verack_received = True
logging.debug(
'%s:%s -> %s', 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('%s:%s -> %s', 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('%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() 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
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)
elif m.command == b'getdata':
getdata = message.GetData.from_message(m)
logging.debug('%s:%s -> %s', 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('%s:%s -> %s', 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('%s:%s -> ping', self.host_print, self.port)
self.send_queue.put(message.Message(b'pong', b''))
elif m.command == b'error':
logging.warning(
'%s:%s -> error: %s', self.host_print, self.port, m.payload)
else:
logging.debug('%s:%s -> %s', self.host_print, self.port, m)
def _request_objects(self):
if self.vectors_to_get and len(self.vectors_requested) < 100:
self.vectors_to_get.difference_update(shared.objects.keys())
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))
if len(self.vectors_to_get) > 64:
pack = random.sample(self.vectors_to_get, 64)
self.send_queue.put(message.GetData(pack))
self.vectors_requested.update({
vector: time.time() for vector in pack
if vector not in self.vectors_requested})
self.vectors_to_get.difference_update(pack)
else:
self.send_queue.put(message.GetData(self.vectors_to_get))
self.vectors_requested.update({
vector: time.time() for vector in self.vectors_to_get
if vector not in self.vectors_requested})
self.vectors_to_get.clear()
if self.vectors_requested:
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(
'Re-requesting %i objects from %s:%s',
len(to_re_request), self.host_print, self.port)
def _send_objects(self):
if self.vectors_to_send:
logging.info(
'Preparing to send %s objects', len(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()))
shared.connection = Connection