import threading import shared import socket from bmconfigparser import BMConfigParser from class_sendDataThread import * from class_receiveDataThread import * import helper_bootstrap from helper_threading import * import protocol import errno import re import state # 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, StoppableThread): def __init__(self): threading.Thread.__init__(self, name="singleListener") self.initStop() def setup(self, selfInitiatedConnections): self.selfInitiatedConnections = selfInitiatedConnections def _createListenSocket(self, family): HOST = '' # Symbolic name meaning all available interfaces # If not sockslisten, but onionhostname defined, only listen on localhost if not BMConfigParser().safeGetBoolean('bitmessagesettings', 'sockslisten') and ".onion" in BMConfigParser().get('bitmessagesettings', 'onionhostname'): HOST = BMConfigParser().get('bitmessagesettings', 'onionbindip') PORT = BMConfigParser().getint('bitmessagesettings', 'port') sock = socket.socket(family, socket.SOCK_STREAM) if family == socket.AF_INET6: # Make sure we can accept both IPv4 and IPv6 connections. # This is the default on everything apart from Windows sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, 0) # 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) return sock def stopThread(self): super(singleListener, self).stopThread() s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) for ip in ('127.0.0.1', BMConfigParser().get('bitmessagesettings', 'onionbindip')): try: s.connect((ip, BMConfigParser().getint('bitmessagesettings', 'port'))) s.shutdown(socket.SHUT_RDWR) s.close() break except: pass def run(self): # If there is a trusted peer then we don't want to accept # incoming connections so we'll just abandon the thread if state.trustedPeer: return while BMConfigParser().safeGetBoolean('bitmessagesettings', 'dontconnect') and state.shutdown == 0: self.stop.wait(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. But if on SOCKS and have an onionhostname, listen # (socket is then only opened for localhost) while BMConfigParser().get('bitmessagesettings', 'socksproxytype')[0:5] == 'SOCKS' and \ (not BMConfigParser().getboolean('bitmessagesettings', 'sockslisten') and \ ".onion" not in BMConfigParser().get('bitmessagesettings', 'onionhostname')) and \ state.shutdown == 0: self.stop.wait(5) logger.info('Listening for incoming connections.') # First try listening on an IPv6 socket. This should also be # able to accept connections on IPv4. If that's not available # we'll fall back to IPv4-only. try: sock = self._createListenSocket(socket.AF_INET6) except socket.error as e: if (isinstance(e.args, tuple) and e.args[0] in (errno.EAFNOSUPPORT, errno.EPFNOSUPPORT, errno.EADDRNOTAVAIL, errno.ENOPROTOOPT, errno.EINVAL)): sock = self._createListenSocket(socket.AF_INET) else: raise # regexp to match an IPv4-mapped IPv6 address mappedAddressRegexp = re.compile(r'^::ffff:([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)$') while state.shutdown == 0: # 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 BMConfigParser().get('bitmessagesettings', 'socksproxytype')[0:5] == 'SOCKS' and not BMConfigParser().getboolean('bitmessagesettings', 'sockslisten') and ".onion" not in BMConfigParser().get('bitmessagesettings', 'onionhostname') and state.shutdown == 0: self.stop.wait(10) while len(shared.connectedHostsList) > \ BMConfigParser().safeGetInt("bitmessagesettings", "maxtotalconnections", 200) + \ BMConfigParser().safeGetInt("bitmessagesettings", "maxbootstrapconnections", 20) \ and state.shutdown == 0: logger.info('We are connected to too many people. Not accepting further incoming connections for ten seconds.') self.stop.wait(10) while state.shutdown == 0: try: socketObject, sockaddr = sock.accept() except socket.error as e: if isinstance(e.args, tuple) and \ e.args[0] in (errno.EINTR,): continue time.wait(1) continue (HOST, PORT) = sockaddr[0:2] # If the address is an IPv4-mapped IPv6 address then # convert it to just the IPv4 representation md = mappedAddressRegexp.match(HOST) if md != None: HOST = md.group(1) # 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. # permit repeated connections from Tor if HOST in shared.connectedHostsList and \ (".onion" not in BMConfigParser().get('bitmessagesettings', 'onionhostname') or not protocol.checkSocksIP(HOST)): # bootstrap provider? Then accept, we'll most likely drop it a little bit later if BMConfigParser().safeGetInt('bitmessagesettings', 'maxoutboundconnections') >= \ BMConfigParser().safeGetInt('bitmessagesettings', 'maxtotalconnections', 200): break socketObject.close() logger.info('We are already connected to ' + str(HOST) + '. Ignoring connection.') else: break someObjectsOfWhichThisRemoteNodeIsAlreadyAware = {} # This is not necessairly a complete list; we clear it from time to time to save memory. sendDataThreadQueue = Queue.Queue() # Used to submit information to the send data thread for this connection. socketObject.settimeout(20) sd = sendDataThread(sendDataThreadQueue) sd.setup( socketObject, HOST, PORT, -1, someObjectsOfWhichThisRemoteNodeIsAlreadyAware) sd.start() rd = receiveDataThread() rd.daemon = True # close the main program even if there are threads left rd.setup( socketObject, HOST, PORT, -1, someObjectsOfWhichThisRemoteNodeIsAlreadyAware, self.selfInitiatedConnections, sendDataThreadQueue, sd.objectHashHolderInstance) rd.start() logger.info('connected to ' + HOST + ' during INCOMING request.')