Asyncore update

- separate queue for processing blocking stuff on reception
- rewrote write buffer as a queue
- some addr handling
- number of half open connections correct

src/bitmessagemain.py

@@ -52,6 +52,7 @@ from bmconfigparser import BMConfigParser
 
 from network.connectionpool import BMConnectionPool
 from network.networkthread import BMNetworkThread
+from network.receivequeuethread import ReceiveQueueThread
 
 # Helper Functions
 import helper_bootstrap
@@ -65,13 +66,13 @@ def connectToStream(streamNumber):
 
     if isOurOperatingSystemLimitedToHavingVeryFewHalfOpenConnections():
         # Some XP and Vista systems can only have 10 outgoing connections at a time.
-        maximumNumberOfHalfOpenConnections = 9
+        state.maximumNumberOfHalfOpenConnections = 9
     else:
-        maximumNumberOfHalfOpenConnections = 64
+        state.maximumNumberOfHalfOpenConnections = 64
     try:
         # don't overload Tor
         if BMConfigParser().get('bitmessagesettings', 'socksproxytype') != 'none':
-            maximumNumberOfHalfOpenConnections = 4
+            state.maximumNumberOfHalfOpenConnections = 4
     except:
         pass
     
@@ -86,7 +87,7 @@ def connectToStream(streamNumber):
     if BMConfigParser().safeGetBoolean("network", "asyncore"):
         BMConnectionPool().connectToStream(streamNumber)
     else:
-        for i in range(maximumNumberOfHalfOpenConnections):
+        for i in range(state.maximumNumberOfHalfOpenConnections):
             a = outgoingSynSender()
             a.setup(streamNumber, selfInitiatedConnections)
             a.start()
@@ -252,6 +253,9 @@ class Main:
             asyncoreThread = BMNetworkThread()
             asyncoreThread.daemon = False
             asyncoreThread.start()
+            receiveQueueThread = ReceiveQueueThread()
+            receiveQueueThread.daemon = False
+            receiveQueueThread.start()
 
         connectToStream(1)
 

src/network/advanceddispatcher.py

@@ -1,4 +1,4 @@
-from threading import RLock
+import Queue
 import time
 
 import asyncore_pollchoose as asyncore
@@ -12,19 +12,15 @@ class AdvancedDispatcher(asyncore.dispatcher):
             asyncore.dispatcher.__init__(self, sock)
         self.read_buf = b""
         self.write_buf = b""
-        self.writeLock = RLock()
+        self.writeQueue = Queue.Queue()
+        self.receiveQueue = Queue.Queue()
         self.state = "init"
         self.lastTx = time.time()
         self.sentBytes = 0
         self.receivedBytes = 0
 
-    def append_write_buf(self, string = None):
-        with self.writeLock:
-            self.write_buf += string
-
     def slice_write_buf(self, length=0):
         if length > 0:
-            with self.writeLock:
             self.write_buf = self.write_buf[length:]
 
     def slice_read_buf(self, length=0):
@@ -54,7 +50,7 @@ class AdvancedDispatcher(asyncore.dispatcher):
         self.state = state
 
     def writable(self):
-        return self.connecting or len(self.write_buf) > 0
+        return self.connecting or len(self.write_buf) > 0 or not self.writeQueue.empty()
 
     def readable(self):
         return self.connecting or len(self.read_buf) < AdvancedDispatcher._buf_len
@@ -74,10 +70,17 @@ class AdvancedDispatcher(asyncore.dispatcher):
     def handle_write(self):
         self.lastTx = time.time()
         if asyncore.maxUploadRate > 0:
-            written = self.send(self.write_buf[0:asyncore.uploadChunk])
+            bufSize = asyncore.uploadChunk
-            asyncore.uploadBucket -= written
         else:
-            written = self.send(self.write_buf)
+            bufSize = self._buf_len
+        while len(self.write_buf) < bufSize:
+            try:
+                self.write_buf += self.writeQueue.get(False)
+            except Queue.Empty:
+                break
+        if len(self.write_buf) > 0:
+            written = self.send(self.write_buf[0:bufSize])
+            asyncore.uploadBucket -= written
             asyncore.updateSent(written)
             self.sentBytes += written
             self.slice_write_buf(written)
@@ -86,6 +89,9 @@ class AdvancedDispatcher(asyncore.dispatcher):
         self.lastTx = time.time()
         self.process()
 
+    def state_close(self):
+        pass
+
     def close(self):
         self.read_buf = b""
         self.write_buf = b""

src/network/bmproto.py

@@ -58,7 +58,7 @@ class BMConnection(TLSDispatcher, BMQueues):
         self.verackSent = False
         self.lastTx = time.time()
         self.streams = [0]
-        self.connectionFullyEstablished = False
+        self.fullyEstablished = False
         self.connectedAt = 0
         self.skipUntil = 0
         if address is None and sock is not None:
@@ -95,8 +95,8 @@ class BMConnection(TLSDispatcher, BMQueues):
     def state_init(self):
         self.bm_proto_reset()
         if self.isOutbound:
-            self.append_write_buf(protocol.assembleVersionMessage(self.destination.host, self.destination.port, network.connectionpool.BMConnectionPool().streams, False))
+            self.writeQueue.put(protocol.assembleVersionMessage(self.destination.host, self.destination.port, network.connectionpool.BMConnectionPool().streams, False))
-            print "%s:%i: Sending version (%ib)"  % (self.destination.host, self.destination.port, len(self.write_buf))
+            print "%s:%i: Sending version"  % (self.destination.host, self.destination.port)
         self.set_state("bm_header")
         return True
 
@@ -114,12 +114,12 @@ class BMConnection(TLSDispatcher, BMQueues):
                     logger.debug("Skipping processing for %.2fs", self.skipUntil - time.time())
             else:
                 logger.debug("Skipping processing due to missing object for %.2fs", self.skipUntil - time.time())
-                self.skipUntil = time.time() + now
+                self.skipUntil = time.time() + delay
 
     def set_connection_fully_established(self):
         UISignalQueue.put(('updateNetworkStatusTab', 'no data'))
         self.antiIntersectionDelay(True)
-        self.connectionFullyEstablished = True
+        self.fullyEstablished = True
         self.sendAddr()
         self.sendBigInv()
 
@@ -135,6 +135,8 @@ class BMConnection(TLSDispatcher, BMQueues):
             self.bm_proto_reset()
             self.set_state("bm_header", 1)
             print "Bad magic"
+            self.close()
+            return False
         if self.payloadLength > BMConnection.maxMessageSize:
             self.invalid = True
         self.set_state("bm_command", protocol.Header.size)
@@ -150,7 +152,7 @@ class BMConnection(TLSDispatcher, BMQueues):
             print "Bad checksum, ignoring"
             self.invalid = True
         retval = True
-        if not self.connectionFullyEstablished and self.command not in ("version", "verack"):
+        if not self.fullyEstablished and self.command not in ("version", "verack"):
             logger.error("Received command %s before connection was fully established, ignoring", self.command)
             self.invalid = True
         if not self.invalid:
@@ -178,7 +180,10 @@ class BMConnection(TLSDispatcher, BMQueues):
             except struct.error:
                 print "decoding error, skipping"
         else:
-            print "Skipping command %s due to invalid data" % (self.command)
+            #print "Skipping command %s due to invalid data" % (self.command)
+            print "Closing due to invalid data" % (self.command)
+            self.close()
+            return False
         if retval:
             self.set_state("bm_header", self.payloadLength)
             self.bm_proto_reset()
@@ -298,12 +303,7 @@ class BMConnection(TLSDispatcher, BMQueues):
             if False:
                 self.antiIntersectionDelay()
             else:
-                try:
+                self.receiveQueue.put(("object", i))
-                    self.append_write_buf(protocol.CreatePacket('object', Inventory()[i].payload))
-                # this is faster than "if i in Inventory()"
-                except KeyError:
-                    self.antiIntersectionDelay()
-                    logger.warning('%s asked for an object with a getdata which is not in either our memory inventory or our SQL inventory. We probably cleaned it out after advertising it but before they got around to asking for it.' % (self.peer,))
         return True
 
     def bm_command_inv(self):
@@ -327,7 +327,7 @@ class BMConnection(TLSDispatcher, BMQueues):
         logger.info('inv message lists %i objects. Of those %i are new to me. It took %f seconds to figure that out.', len(items), len(self.objectsNewToMe), time.time()-startTime)
 
         payload = addresses.encodeVarint(len(self.objectsNewToMe)) + ''.join(self.objectsNewToMe.keys())
-        self.append_write_buf(protocol.CreatePacket('getdata', payload))
+        self.writeQueue.put(protocol.CreatePacket('getdata', payload))
 
 #        for i in random.sample(self.objectsNewToMe, len(self.objectsNewToMe)):
 #            DownloadQueue().put(i)
@@ -370,6 +370,18 @@ class BMConnection(TLSDispatcher, BMQueues):
 
     def bm_command_addr(self):
         addresses = self.decode_payload_content("lQIQ16sH")
+        import pprint
+        for i in addresses:
+            seenTime, stream, services, ip, port = i
+            decodedIP = protocol.checkIPAddress(ip)
+            if stream not in state.streamsInWhichIAmParticipating:
+                continue
+            #print "maybe adding %s in stream %i to knownnodes (%i)" % (decodedIP, stream, len(knownnodes.knownNodes[stream]))
+            if decodedIP is not False and seenTime > time.time() - 10800:
+                peer = state.Peer(decodedIP, port)
+                if peer in knownnodes.knownNodes[stream] and knownnodes.knownNodes[stream][peer] > seenTime:
+                    continue
+                knownnodes.knownNodes[stream][peer] = seenTime
         return True
 
     def bm_command_portcheck(self):
@@ -377,7 +389,7 @@ class BMConnection(TLSDispatcher, BMQueues):
         return True
 
     def bm_command_ping(self):
-        self.append_write_buf(protocol.CreatePacket('pong'))
+        self.writeQueue.put(protocol.CreatePacket('pong'))
         return True
 
     def bm_command_pong(self):
@@ -411,11 +423,11 @@ class BMConnection(TLSDispatcher, BMQueues):
             # TODO ABORT
             return True
         #shared.connectedHostsList[self.destination] = self.streams[0]
-        self.append_write_buf(protocol.CreatePacket('verack'))
+        self.writeQueue.put(protocol.CreatePacket('verack'))
         self.verackSent = True
         if not self.isOutbound:
-            self.append_write_buf(protocol.assembleVersionMessage(self.destination.host, self.destination.port, network.connectionpool.BMConnectionPool().streams, True))
+            self.writeQueue.put(protocol.assembleVersionMessage(self.destination.host, self.destination.port, network.connectionpool.BMConnectionPool().streams, True))
-            print "%s:%i: Sending version (%ib)"  % (self.destination.host, self.destination.port, len(self.write_buf))
+            print "%s:%i: Sending version"  % (self.destination.host, self.destination.port)
         if ((self.services & protocol.NODE_SSL == protocol.NODE_SSL) and
                 protocol.haveSSL(not self.isOutbound)):
             self.isSSL = True
@@ -431,20 +443,20 @@ class BMConnection(TLSDispatcher, BMQueues):
 
     def peerValidityChecks(self):
         if self.remoteProtocolVersion < 3:
-            self.append_write_buf(protocol.assembleErrorMessage(fatal=2,
+            self.writeQueue.put(protocol.assembleErrorMessage(fatal=2,
                 errorText="Your is using an old protocol. Closing connection."))
             logger.debug ('Closing connection to old protocol version %s, node: %s',
                 str(self.remoteProtocolVersion), str(self.peer))
             return False
         if self.timeOffset > 3600:
-            self.append_write_buf(protocol.assembleErrorMessage(fatal=2,
+            self.writeQueue.put(protocol.assembleErrorMessage(fatal=2,
                 errorText="Your time is too far in the future compared to mine. Closing connection."))
             logger.info("%s's time is too far in the future (%s seconds). Closing connection to it.",
                 self.peer, self.timeOffset)
             shared.timeOffsetWrongCount += 1
             return False
         elif self.timeOffset < -3600:
-            self.append_write_buf(protocol.assembleErrorMessage(fatal=2,
+            self.writeQueue.put(protocol.assembleErrorMessage(fatal=2,
                 errorText="Your time is too far in the past compared to mine. Closing connection."))
             logger.info("%s's time is too far in the past (timeOffset %s seconds). Closing connection to it.",
                 self.peer, self.timeOffset)
@@ -453,7 +465,7 @@ class BMConnection(TLSDispatcher, BMQueues):
         else:
             shared.timeOffsetWrongCount = 0
         if len(self.streams) == 0:
-            self.append_write_buf(protocol.assembleErrorMessage(fatal=2,
+            self.writeQueue.put(protocol.assembleErrorMessage(fatal=2,
                 errorText="We don't have shared stream interests. Closing connection."))
             logger.debug ('Closed connection to %s because there is no overlapping interest in streams.',
                 str(self.peer))
@@ -461,7 +473,7 @@ class BMConnection(TLSDispatcher, BMQueues):
         if self.destination in network.connectionpool.BMConnectionPool().inboundConnections:
             try:
                 if not protocol.checkSocksIP(self.destination.host):
-                    self.append_write_buf(protocol.assembleErrorMessage(fatal=2,
+                    self.writeQueue.put(protocol.assembleErrorMessage(fatal=2,
                         errorText="Too many connections from your IP. Closing connection."))
                     logger.debug ('Closed connection to %s because we are already connected to that IP.',
                         str(self.peer))
@@ -474,7 +486,7 @@ class BMConnection(TLSDispatcher, BMQueues):
         def sendChunk():
             if addressCount == 0:
                 return
-            self.append_write_buf(protocol.CreatePacket('addr', \
+            self.writeQueue.put(protocol.CreatePacket('addr', \
                 addresses.encodeVarint(addressCount) + payload))
 
         # We are going to share a maximum number of 1000 addrs (per overlapping
@@ -563,7 +575,7 @@ class BMConnection(TLSDispatcher, BMQueues):
             if objectCount == 0:
                 return
             logger.debug('Sending huge inv message with %i objects to just this one peer', objectCount)
-            self.append_write_buf(protocol.CreatePacket('inv', addresses.encodeVarint(objectCount) + payload))
+            self.writeQueue.put(protocol.CreatePacket('inv', addresses.encodeVarint(objectCount) + payload))
 
         # Select all hashes for objects in this stream.
         bigInvList = {}
@@ -613,6 +625,7 @@ class BMConnection(TLSDispatcher, BMQueues):
             self.close()
 
     def close(self, reason=None):
+        self.set_state("close")
         if reason is None:
             print "%s:%i: closing" % (self.destination.host, self.destination.port)
             #traceback.print_stack()
@@ -653,7 +666,10 @@ class BMServer(AdvancedDispatcher):
         pair = self.accept()
         if pair is not None:
             sock, addr = pair
+            try:
                 network.connectionpool.BMConnectionPool().addConnection(BMConnection(sock=sock))
+            except socket.errno:
+                pass
 
 
 if __name__ == "__main__":

src/network/connectionpool.py

@@ -104,7 +104,10 @@ class BMConnectionPool(object):
                 print "bootstrapping dns"
                 helper_bootstrap.dns()
                 self.bootstrapped = True
-            for i in range(len(self.outboundConnections), BMConfigParser().safeGetInt("bitmessagesettings", "maxoutboundconnections")):
+            established = sum(1 for c in self.outboundConnections.values() if (c.connected and c.fullyEstablished))
+            pending = len(self.outboundConnections) - established
+            if established < BMConfigParser().safeGetInt("bitmessagesettings", "maxoutboundconnections"):
+                for i in range(state.maximumNumberOfHalfOpenConnections - pending):
                     chosen = chooseConnection(random.choice(self.streams))
                     if chosen in self.outboundConnections:
                         continue
@@ -142,10 +145,10 @@ class BMConnectionPool(object):
 
         for i in self.inboundConnections.values() + self.outboundConnections.values():
             minTx = time.time() - 20
-            if i.connectionFullyEstablished:
+            if i.fullyEstablished:
                 minTx -= 300 - 20
             if i.lastTx < minTx:
-                if i.connectionFullyEstablished:
+                if i.fullyEstablished:
-                    i.append_write_buf(protocol.CreatePacket('ping'))
+                    i.writeQueue.put(protocol.CreatePacket('ping'))
                 else:
                     i.close("Timeout (%is)" % (time.time() - i.lastTx))

src/network/networkthread.py

@@ -8,7 +8,7 @@ from network.connectionpool import BMConnectionPool
 
 class BMNetworkThread(threading.Thread, StoppableThread):
     def __init__(self):
-        threading.Thread.__init__(self, name="BMNetworkThread")
+        threading.Thread.__init__(self, name="AsyncoreThread")
         self.initStop()
         self.name = "AsyncoreThread"
         BMConnectionPool()

src/network/receivequeuethread.py

@@ -0,0 +1,44 @@
+import Queue
+import threading
+
+from bmconfigparser import BMConfigParser
+from debug import logger
+from helper_threading import StoppableThread
+from inventory import Inventory
+from network.connectionpool import BMConnectionPool
+import protocol
+
+class ReceiveQueueThread(threading.Thread, StoppableThread):
+    def __init__(self):
+        threading.Thread.__init__(self, name="ReceiveQueueThread")
+        self.initStop()
+        self.name = "ReceiveQueueThread"
+        BMConnectionPool()
+        logger.error("init asyncore thread")
+
+    def run(self):
+        while not self._stopped:
+            processed = 0
+            for i in BMConnectionPool().inboundConnections.values() + BMConnectionPool().outboundConnections.values():
+                try:
+                    command, args = i.receiveQueue.get(False)
+                except Queue.Empty:
+                    continue
+                processed += 1
+                try:
+                    getattr(self, "command_" + str(command))(i, args)
+                except AttributeError:
+                    # missing command
+                    raise
+            if processed == 0:
+                self.stop.wait(0.2)
+
+    def command_object(self, connection, objHash):
+        try:
+            connection.writeQueue.put(protocol.CreatePacket('object', Inventory()[objHash].payload))
+        except KeyError:
+            connection.antiIntersectionDelay()
+            logger.warning('%s asked for an object with a getdata which is not in either our memory inventory or our SQL inventory. We probably cleaned it out after advertising it but before they got around to asking for it.' % (connection.destination,))
+
+    def stopThread(self):
+        super(ReceiveQueueThread, self).stopThread()

src/network/socks4a.py

@@ -59,28 +59,28 @@ class Socks4aConnection(Socks4a):
     def state_auth_done(self):
         # Now we can request the actual connection
         rmtrslv = False
-        self.append_write_buf(struct.pack('>BBH', 0x04, 0x01, self.destination[1]))
+        self.writeQueue.put(struct.pack('>BBH', 0x04, 0x01, self.destination[1]))
         # If the given destination address is an IP address, we'll
         # use the IPv4 address request even if remote resolving was specified.
         try:
             self.ipaddr = socket.inet_aton(self.destination[0])
-            self.append_write_buf(self.ipaddr)
+            self.writeQueue.put(self.ipaddr)
         except socket.error:
             # Well it's not an IP number,  so it's probably a DNS name.
             if Proxy._remote_dns:
                 # Resolve remotely
                 rmtrslv = True
                 self.ipaddr = None
-                self.append_write_buf(struct.pack("BBBB", 0x00, 0x00, 0x00, 0x01))
+                self.writeQueue.put(struct.pack("BBBB", 0x00, 0x00, 0x00, 0x01))
             else:
                 # Resolve locally
                 self.ipaddr = socket.inet_aton(socket.gethostbyname(self.destination[0]))
-                self.append_write_buf(self.ipaddr)
+                self.writeQueue.put(self.ipaddr)
         if self._auth:
-            self.append_write_buf(self._auth[0])
+            self.writeQueue.put(self._auth[0])
-        self.append_write_buf(chr(0x00).encode())
+        self.writeQueue.put(chr(0x00).encode())
         if rmtrslv:
-            self.append_write_buf(self.destination[0] + chr(0x00).encode())
+            self.writeQueue.put(self.destination[0] + chr(0x00).encode())
         self.set_state("pre_connect", 0)
 
 
@@ -92,12 +92,12 @@ class Socks4aResolver(Socks4a):
 
     def state_auth_done(self):
         # Now we can request the actual connection
-        self.append_write_buf(struct.pack('>BBH', 0x04, 0xF0, self.destination[1]))
+        self.writeQueue.put(struct.pack('>BBH', 0x04, 0xF0, self.destination[1]))
-        self.append_write_buf(struct.pack("BBBB", 0x00, 0x00, 0x00, 0x01))
+        self.writeQueue.put(struct.pack("BBBB", 0x00, 0x00, 0x00, 0x01))
         if self._auth:
-            self.append_write_buf(self._auth[0])
+            self.writeQueue.put(self._auth[0])
-        self.append_write_buf(chr(0x00).encode())
+        self.writeQueue.put(chr(0x00).encode())
-        self.append_write_buf(self.host + chr(0x00).encode())
+        self.writeQueue.put(self.host + chr(0x00).encode())
         self.set_state("pre_connect", 0)
 
     def resolved(self):

src/network/socks5.py

@@ -17,9 +17,9 @@ class Socks5(Proxy):
 
     def state_init(self):
         if self._auth:
-            self.append_write_buf(struct.pack('BBBB', 0x05, 0x02, 0x00, 0x02))
+            self.writeQueue.put(struct.pack('BBBB', 0x05, 0x02, 0x00, 0x02))
         else:
-            self.append_write_buf(struct.pack('BBB', 0x05, 0x01, 0x00))
+            self.writeQueue.put(struct.pack('BBB', 0x05, 0x01, 0x00))
         self.set_state("auth_1", 0)
 
     def state_auth_1(self):
@@ -35,7 +35,7 @@ class Socks5(Proxy):
             self.set_state("auth_done", 2)
         elif ret[1] == 2:
             # username/password
-            self.append_write_buf(struct.pack('BB', 1, len(self._auth[0])) + \
+            self.writeQueue.put(struct.pack('BB', 1, len(self._auth[0])) + \
                 self._auth[0] + struct.pack('B', len(self._auth[1])) + \
                 self._auth[1])
             self.set_state("auth_1", 2)
@@ -130,23 +130,23 @@ class Socks5Connection(Socks5):
 
     def state_auth_done(self):
         # Now we can request the actual connection
-        self.append_write_buf(struct.pack('BBB', 0x05, 0x01, 0x00))
+        self.writeQueue.put(struct.pack('BBB', 0x05, 0x01, 0x00))
         # If the given destination address is an IP address, we'll
         # use the IPv4 address request even if remote resolving was specified.
         try:
             self.ipaddr = socket.inet_aton(self.destination[0])
-            self.append_write_buf(chr(0x01).encode() + self.ipaddr)
+            self.writeQueue.put(chr(0x01).encode() + self.ipaddr)
         except socket.error:
             # Well it's not an IP number,  so it's probably a DNS name.
             if Proxy._remote_dns:
                 # Resolve remotely
                 self.ipaddr = None
-                self.append_write_buf(chr(0x03).encode() + chr(len(self.destination[0])).encode() + self.destination[0])
+                self.writeQueue.put(chr(0x03).encode() + chr(len(self.destination[0])).encode() + self.destination[0])
             else:
                 # Resolve locally
                 self.ipaddr = socket.inet_aton(socket.gethostbyname(self.destination[0]))
-                self.append_write_buf(chr(0x01).encode() + self.ipaddr)
+                self.writeQueue.put(chr(0x01).encode() + self.ipaddr)
-        self.append_write_buf(struct.pack(">H", self.destination[1]))
+        self.writeQueue.put(struct.pack(">H", self.destination[1]))
         self.set_state("pre_connect", 0)
 
 
@@ -158,9 +158,9 @@ class Socks5Resolver(Socks5):
 
     def state_auth_done(self):
         # Now we can request the actual connection
-        self.append_write_buf(struct.pack('BBB', 0x05, 0xF0, 0x00))
+        self.writeQueue.put(struct.pack('BBB', 0x05, 0xF0, 0x00))
-        self.append_write_buf(chr(0x03).encode() + chr(len(self.host)).encode() + str(self.host))
+        self.writeQueue.put(chr(0x03).encode() + chr(len(self.host)).encode() + str(self.host))
-        self.append_write_buf(struct.pack(">H", self.port))
+        self.writeQueue.put(struct.pack(">H", self.port))
         self.set_state("pre_connect", 0)
 
     def resolved(self):

src/protocol.py

@@ -67,7 +67,7 @@ def isBitSetWithinBitfield(fourByteString, n):
     x, = unpack('>L', fourByteString)
     return x & 2**n != 0
 
-# data handling
+# ip addresses
 
 def encodeHost(host):
     if host.find('.onion') > -1:
@@ -86,6 +86,49 @@ def networkType(host):
     else:
         return 'IPv6'
 
+def checkIPAddress(host):
+    if host[0:12] == '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF':
+        hostStandardFormat = socket.inet_ntop(socket.AF_INET, host[12:])
+        return checkIPv4Address(host[12:], hostStandardFormat)
+    elif host[0:6] == '\xfd\x87\xd8\x7e\xeb\x43':
+        # Onion, based on BMD/bitcoind
+        hostStandardFormat = base64.b32encode(host[6:]).lower() + ".onion"
+        return hostStandardFormat
+    else:
+        hostStandardFormat = socket.inet_ntop(socket.AF_INET6, host)
+        if hostStandardFormat == "":
+            # This can happen on Windows systems which are not 64-bit compatible 
+            # so let us drop the IPv6 address. 
+            return False
+        return checkIPv6Address(host, hostStandardFormat)
+
+def checkIPv4Address(host, hostStandardFormat):
+    if host[0] == '\x7F': # 127/8
+        logger.debug('Ignoring IP address in loopback range: ' + hostStandardFormat)
+        return False
+    if host[0] == '\x0A': # 10/8
+        logger.debug('Ignoring IP address in private range: ' + hostStandardFormat)
+        return False
+    if host[0:2] == '\xC0\xA8': # 192.168/16
+        logger.debug('Ignoring IP address in private range: ' + hostStandardFormat)
+        return False
+    if host[0:2] >= '\xAC\x10' and host[0:2] < '\xAC\x20': # 172.16/12
+        logger.debug('Ignoring IP address in private range:' + hostStandardFormat)
+        return False
+    return hostStandardFormat
+
+def checkIPv6Address(host, hostStandardFormat):
+    if host == ('\x00' * 15) + '\x01':
+        logger.debug('Ignoring loopback address: ' + hostStandardFormat)
+        return False
+    if host[0] == '\xFE' and (ord(host[1]) & 0xc0) == 0x80:
+        logger.debug ('Ignoring local address: ' + hostStandardFormat)
+        return False
+    if (ord(host[0]) & 0xfe) == 0xfc:
+        logger.debug ('Ignoring unique local address: ' + hostStandardFormat)
+        return False
+    return hostStandardFormat
+
 # checks
 
 def haveSSL(server = False):

src/state.py

@@ -21,6 +21,8 @@ curses = False
 
 sqlReady = False # set to true by sqlTread when ready for processing
 
+maximumNumberOfHalfOpenConnections = 0
+
 # If the trustedpeer option is specified in keys.dat then this will
 # contain a Peer which will be connected to instead of using the
 # addresses advertised by other peers. The client will only connect to