Reference client for Bitmessage: a P2P encrypted decentralised communication protocol:
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"""
src/network/udp.py
==================
"""
import logging
import time
import socket
import state
import protocol
from bmproto import BMProto
from node import Peer
from objectracker import ObjectTracker
from queues import receiveDataQueue
logger = logging.getLogger('default')
class UDPSocket(BMProto): # pylint: disable=too-many-instance-attributes
"""Bitmessage protocol over UDP (class)"""
port = 8444
announceInterval = 60
def __init__(self, host=None, sock=None, announcing=False):
# pylint: disable=bad-super-call
super(BMProto, self).__init__(sock=sock)
self.verackReceived = True
self.verackSent = True
# .. todo:: sort out streams
self.streams = [1]
self.fullyEstablished = True
self.connectedAt = 0
self.skipUntil = 0
if sock is None:
if host is None:
host = ''
self.create_socket(
socket.AF_INET6 if ":" in host else socket.AF_INET,
socket.SOCK_DGRAM
)
self.set_socket_reuse()
logger.info("Binding UDP socket to %s:%i", host, self.port)
self.socket.bind((host, self.port))
else:
self.socket = sock
self.set_socket_reuse()
self.listening = Peer(*self.socket.getsockname())
self.destination = Peer(*self.socket.getsockname())
ObjectTracker.__init__(self)
self.connecting = False
self.connected = True
self.announcing = announcing
self.set_state("bm_header", expectBytes=protocol.Header.size)
def set_socket_reuse(self):
"""Set socket reuse option"""
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
try:
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
except AttributeError:
pass
# disable most commands before doing research / testing
# only addr (peer discovery), error and object are implemented
def bm_command_getdata(self):
# return BMProto.bm_command_getdata(self)
return True
def bm_command_inv(self):
# return BMProto.bm_command_inv(self)
return True
def bm_command_addr(self):
addresses = self._decode_addr()
# only allow peer discovery from private IPs in order to avoid
# attacks from random IPs on the internet
if not self.local:
return True
remoteport = False
for seenTime, stream, services, ip, port in addresses:
decodedIP = protocol.checkIPAddress(str(ip))
if stream not in state.streamsInWhichIAmParticipating:
continue
if (seenTime < time.time() - self.maxTimeOffset
or seenTime > time.time() + self.maxTimeOffset):
continue
if decodedIP is False:
# if the address isn't local, interpret it as
# the host's own announcement
remoteport = port
if remoteport is False:
return True
logger.debug(
"received peer discovery from %s:%i (port %i):",
self.destination.host, self.destination.port, remoteport)
if self.local:
state.discoveredPeers[
Peer(self.destination.host, remoteport)
] = time.time()
return True
def bm_command_portcheck(self):
return True
def bm_command_ping(self):
return True
def bm_command_pong(self):
return True
def bm_command_verack(self):
return True
def bm_command_version(self):
return True
def handle_connect(self):
return
def writable(self):
return self.write_buf
def readable(self):
return len(self.read_buf) < self._buf_len
def handle_read(self):
try:
(recdata, addr) = self.socket.recvfrom(self._buf_len)
except socket.error as e:
logger.error("socket error: %s", e)
return
self.destination = Peer(*addr)
encodedAddr = protocol.encodeHost(addr[0])
self.local = bool(protocol.checkIPAddress(encodedAddr, True))
# overwrite the old buffer to avoid mixing data and so that
# self.local works correctly
self.read_buf[0:] = recdata
self.bm_proto_reset()
receiveDataQueue.put(self.listening)
def handle_write(self):
try:
retval = self.socket.sendto(
self.write_buf, ('<broadcast>', self.port))
except socket.error as e:
logger.error("socket error on sendato: %s", e)
retval = 0
self.slice_write_buf(retval)