138 lines
6.1 KiB
Python
138 lines
6.1 KiB
Python
import threading
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import shared
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import socket
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from class_sendDataThread import *
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from class_receiveDataThread import *
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import helper_bootstrap
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from helper_threading import *
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import errno
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import re
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# Only one singleListener thread will ever exist. It creates the
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# receiveDataThread and sendDataThread for each incoming connection. Note
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# that it cannot set the stream number because it is not known yet- the
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# other node will have to tell us its stream number in a version message.
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# If we don't care about their stream, we will close the connection
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# (within the recversion function of the recieveData thread)
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class singleListener(threading.Thread, StoppableThread):
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def __init__(self):
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threading.Thread.__init__(self, name="singleListener")
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self.initStop()
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def setup(self, selfInitiatedConnections):
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self.selfInitiatedConnections = selfInitiatedConnections
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def _createListenSocket(self, family):
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HOST = '' # Symbolic name meaning all available interfaces
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PORT = shared.config.getint('bitmessagesettings', 'port')
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sock = socket.socket(family, socket.SOCK_STREAM)
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if family == socket.AF_INET6:
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# Make sure we can accept both IPv4 and IPv6 connections.
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# This is the default on everything apart from Windows
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sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, 0)
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# This option apparently avoids the TIME_WAIT state so that we can
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# rebind faster
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sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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sock.bind((HOST, PORT))
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sock.listen(2)
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return sock
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def stopThread(self):
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super(singleListener, self).stopThread()
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s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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try:
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s.connect(('127.0.0.1', shared.config.getint('bitmessagesettings', 'port')))
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s.shutdown(socket.SHUT_RDWR)
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s.close()
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except:
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pass
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def run(self):
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# If there is a trusted peer then we don't want to accept
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# incoming connections so we'll just abandon the thread
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if shared.trustedPeer:
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return
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while shared.safeConfigGetBoolean('bitmessagesettings', 'dontconnect') and shared.shutdown == 0:
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self.stop.wait(1)
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helper_bootstrap.dns()
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# We typically don't want to accept incoming connections if the user is using a
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# SOCKS proxy, unless they have configured otherwise. If they eventually select
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# proxy 'none' or configure SOCKS listening then this will start listening for
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# connections.
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while shared.config.get('bitmessagesettings', 'socksproxytype')[0:5] == 'SOCKS' and not shared.config.getboolean('bitmessagesettings', 'sockslisten') and shared.shutdown == 0:
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self.stop.wait(5)
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logger.info('Listening for incoming connections.')
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# First try listening on an IPv6 socket. This should also be
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# able to accept connections on IPv4. If that's not available
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# we'll fall back to IPv4-only.
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try:
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sock = self._createListenSocket(socket.AF_INET6)
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except socket.error, e:
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if (isinstance(e.args, tuple) and
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e.args[0] in (errno.EAFNOSUPPORT,
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errno.EPFNOSUPPORT,
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errno.ENOPROTOOPT)):
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sock = self._createListenSocket(socket.AF_INET)
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else:
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raise
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# regexp to match an IPv4-mapped IPv6 address
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mappedAddressRegexp = re.compile(r'^::ffff:([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)$')
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while shared.shutdown == 0:
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# We typically don't want to accept incoming connections if the user is using a
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# SOCKS proxy, unless they have configured otherwise. If they eventually select
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# proxy 'none' or configure SOCKS listening then this will start listening for
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# connections.
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while shared.config.get('bitmessagesettings', 'socksproxytype')[0:5] == 'SOCKS' and not shared.config.getboolean('bitmessagesettings', 'sockslisten') and shared.shutdown == 0:
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self.stop.wait(10)
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while len(shared.connectedHostsList) > 220 and shared.shutdown == 0:
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logger.info('We are connected to too many people. Not accepting further incoming connections for ten seconds.')
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self.stop.wait(10)
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while shared.shutdown == 0:
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socketObject, sockaddr = sock.accept()
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(HOST, PORT) = sockaddr[0:2]
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# If the address is an IPv4-mapped IPv6 address then
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# convert it to just the IPv4 representation
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md = mappedAddressRegexp.match(HOST)
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if md != None:
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HOST = md.group(1)
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# The following code will, unfortunately, block an
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# incoming connection if someone else on the same LAN
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# is already connected because the two computers will
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# share the same external IP. This is here to prevent
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# connection flooding.
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if HOST in shared.connectedHostsList:
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socketObject.close()
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logger.info('We are already connected to ' + str(HOST) + '. Ignoring connection.')
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else:
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break
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someObjectsOfWhichThisRemoteNodeIsAlreadyAware = {} # This is not necessairly a complete list; we clear it from time to time to save memory.
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sendDataThreadQueue = Queue.Queue() # Used to submit information to the send data thread for this connection.
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socketObject.settimeout(20)
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sd = sendDataThread(sendDataThreadQueue)
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sd.setup(
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socketObject, HOST, PORT, -1, someObjectsOfWhichThisRemoteNodeIsAlreadyAware)
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sd.start()
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rd = receiveDataThread()
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rd.daemon = True # close the main program even if there are threads left
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rd.setup(
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socketObject, HOST, PORT, -1, someObjectsOfWhichThisRemoteNodeIsAlreadyAware, self.selfInitiatedConnections, sendDataThreadQueue)
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rd.start()
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logger.info('connected to ' + HOST + ' during INCOMING request.')
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