Reference client for Bitmessage: a P2P encrypted decentralised communication protocol:
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import threading
import shared
import socket
from class_sendDataThread import *
from class_receiveDataThread import *
import helper_bootstrap
# Only one singleListener thread will ever exist. It creates the
# receiveDataThread and sendDataThread for each incoming connection. Note
# that it cannot set the stream number because it is not known yet- the
# other node will have to tell us its stream number in a version message.
# If we don't care about their stream, we will close the connection
# (within the recversion function of the recieveData thread)
class singleListener(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
def setup(self, selfInitiatedConnections):
self.selfInitiatedConnections = selfInitiatedConnections
def run(self):
while shared.safeConfigGetBoolean('bitmessagesettings', 'dontconnect'):
time.sleep(1)
#helper_bootstrap.dns()
# We typically don't want to accept incoming connections if the user is using a
# SOCKS proxy, unless they have configured otherwise. If they eventually select
# proxy 'none' or configure SOCKS listening then this will start listening for
# connections.
while shared.config.get('bitmessagesettings', 'socksproxytype')[0:5] == 'SOCKS' and not shared.config.getboolean('bitmessagesettings', 'sockslisten'):
time.sleep(5)
with shared.printLock:
print 'Listening for incoming connections.'
HOST = '' # Symbolic name meaning all available interfaces
PORT = shared.config.getint('bitmessagesettings', 'port')
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# This option apparently avoids the TIME_WAIT state so that we can
# rebind faster
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind((HOST, PORT))
sock.listen(2)
while True:
# We typically don't want to accept incoming connections if the user is using a
# SOCKS proxy, unless they have configured otherwise. If they eventually select
# proxy 'none' or configure SOCKS listening then this will start listening for
# connections.
while shared.config.get('bitmessagesettings', 'socksproxytype')[0:5] == 'SOCKS' and not shared.config.getboolean('bitmessagesettings', 'sockslisten'):
time.sleep(10)
while len(shared.connectedHostsList) > 220:
with shared.printLock:
print 'We are connected to too many people. Not accepting further incoming connections for ten seconds.'
time.sleep(10)
a, (HOST, PORT) = sock.accept()
# The following code will, unfortunately, block an incoming
# connection if someone else on the same LAN is already connected
# because the two computers will share the same external IP. This
# is here to prevent connection flooding.
while HOST in shared.connectedHostsList:
with shared.printLock:
print 'We are already connected to', HOST + '. Ignoring connection.'
a.close()
a, (HOST, PORT) = sock.accept()
someObjectsOfWhichThisRemoteNodeIsAlreadyAware = {} # This is not necessairly a complete list; we clear it from time to time to save memory.
a.settimeout(20)
sd = sendDataThread()
sd.setup(
a, HOST, PORT, -1, someObjectsOfWhichThisRemoteNodeIsAlreadyAware)
sd.start()
rd = receiveDataThread()
rd.daemon = True # close the main program even if there are threads left
rd.setup(
a, HOST, PORT, -1, someObjectsOfWhichThisRemoteNodeIsAlreadyAware, self.selfInitiatedConnections)
rd.start()
with shared.printLock:
print self, 'connected to', HOST, 'during INCOMING request.'