PyBitmessage/src/bitmessagemain.py

#!/usr/bin/env python2.7
# Copyright (c) 2012 Jonathan Warren
# Copyright (c) 2012 The Bitmessage developers
# Distributed under the MIT/X11 software license. See the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.

# Right now, PyBitmessage only support connecting to stream 1. It doesn't
# yet contain logic to expand into further streams.

# The software version variable is now held in shared.py
verbose = 1
maximumAgeOfAnObjectThatIAmWillingToAccept = 216000  # Equals two days and 12 hours.
lengthOfTimeToLeaveObjectsInInventory = 237600  # Equals two days and 18 hours. This should be longer than maximumAgeOfAnObjectThatIAmWillingToAccept so that we don't process messages twice.
lengthOfTimeToHoldOnToAllPubkeys = 2419200  # Equals 4 weeks. You could make this longer if you want but making it shorter would not be advisable because there is a very small possibility that it could keep you from obtaining a needed pubkey for a period of time.
maximumAgeOfObjectsThatIAdvertiseToOthers = 216000  # Equals two days and 12 hours
maximumAgeOfNodesThatIAdvertiseToOthers = 10800  # Equals three hours
storeConfigFilesInSameDirectoryAsProgramByDefault = False  # The user may de-select Portable Mode in the settings if they want the config files to stay in the application data folder.
useVeryEasyProofOfWorkForTesting = False  # If you set this to True while on the normal network, you won't be able to send or sometimes receive messages.
encryptedBroadcastSwitchoverTime = 1369735200

import sys
import ConfigParser
import Queue
from addresses import *
import shared
from defaultKnownNodes import *
import time
import socket
import threading
import hashlib
from struct import *
import pickle
import random
import sqlite3
from time import strftime, localtime, gmtime
import shutil  # used for moving the messages.dat file
import string
import socks
import highlevelcrypto
from pyelliptic.openssl import OpenSSL
import ctypes
from pyelliptic import arithmetic
import signal  # Used to capture a Ctrl-C keypress so that Bitmessage can shutdown gracefully.
# The next 3 are used for the API
from SimpleXMLRPCServer import *
import json
from subprocess import call  # used when the API must execute an outside program
import singleton
import proofofwork

# For each stream to which we connect, several outgoingSynSender threads
# will exist and will collectively create 8 connections with peers.

class outgoingSynSender(threading.Thread):

    def __init__(self):
        threading.Thread.__init__(self)

    def setup(self, streamNumber):
        self.streamNumber = streamNumber

    def run(self):
        time.sleep(1)
        global alreadyAttemptedConnectionsListResetTime
        while True:
            while len(selfInitiatedConnections[self.streamNumber]) >= 8:  # maximum number of outgoing connections = 8
                time.sleep(10)
            if shared.shutdown:
                break
            random.seed()
            HOST, = random.sample(shared.knownNodes[self.streamNumber], 1)
            alreadyAttemptedConnectionsListLock.acquire()
            while HOST in alreadyAttemptedConnectionsList or HOST in shared.connectedHostsList:
                alreadyAttemptedConnectionsListLock.release()
                # print 'choosing new sample'
                random.seed()
                HOST, = random.sample(shared.knownNodes[
                                      self.streamNumber], 1)
                time.sleep(1)
                # Clear out the alreadyAttemptedConnectionsList every half
                # hour so that this program will again attempt a connection
                # to any nodes, even ones it has already tried.
                if (time.time() - alreadyAttemptedConnectionsListResetTime) > 1800:
                    alreadyAttemptedConnectionsList.clear()
                    alreadyAttemptedConnectionsListResetTime = int(
                        time.time())
                alreadyAttemptedConnectionsListLock.acquire()
            alreadyAttemptedConnectionsList[HOST] = 0
            alreadyAttemptedConnectionsListLock.release()
            PORT, timeNodeLastSeen = shared.knownNodes[
                self.streamNumber][HOST]
            sock = socks.socksocket(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.settimeout(20)
            if shared.config.get('bitmessagesettings', 'socksproxytype') == 'none' and verbose >= 2:
                shared.printLock.acquire()
                print 'Trying an outgoing connection to', HOST, ':', PORT
                shared.printLock.release()
                # sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            elif shared.config.get('bitmessagesettings', 'socksproxytype') == 'SOCKS4a':
                if verbose >= 2:
                    shared.printLock.acquire()
                    print '(Using SOCKS4a) Trying an outgoing connection to', HOST, ':', PORT
                    shared.printLock.release()
                proxytype = socks.PROXY_TYPE_SOCKS4
                sockshostname = shared.config.get(
                    'bitmessagesettings', 'sockshostname')
                socksport = shared.config.getint(
                    'bitmessagesettings', 'socksport')
                rdns = True  # Do domain name lookups through the proxy; though this setting doesn't really matter since we won't be doing any domain name lookups anyway.
                if shared.config.getboolean('bitmessagesettings', 'socksauthentication'):
                    socksusername = shared.config.get(
                        'bitmessagesettings', 'socksusername')
                    sockspassword = shared.config.get(
                        'bitmessagesettings', 'sockspassword')
                    sock.setproxy(
                        proxytype, sockshostname, socksport, rdns, socksusername, sockspassword)
                else:
                    sock.setproxy(
                        proxytype, sockshostname, socksport, rdns)
            elif shared.config.get('bitmessagesettings', 'socksproxytype') == 'SOCKS5':
                if verbose >= 2:
                    shared.printLock.acquire()
                    print '(Using SOCKS5) Trying an outgoing connection to', HOST, ':', PORT
                    shared.printLock.release()
                proxytype = socks.PROXY_TYPE_SOCKS5
                sockshostname = shared.config.get(
                    'bitmessagesettings', 'sockshostname')
                socksport = shared.config.getint(
                    'bitmessagesettings', 'socksport')
                rdns = True  # Do domain name lookups through the proxy; though this setting doesn't really matter since we won't be doing any domain name lookups anyway.
                if shared.config.getboolean('bitmessagesettings', 'socksauthentication'):
                    socksusername = shared.config.get(
                        'bitmessagesettings', 'socksusername')
                    sockspassword = shared.config.get(
                        'bitmessagesettings', 'sockspassword')
                    sock.setproxy(
                        proxytype, sockshostname, socksport, rdns, socksusername, sockspassword)
                else:
                    sock.setproxy(
                        proxytype, sockshostname, socksport, rdns)

            try:
                sock.connect((HOST, PORT))
                rd = receiveDataThread()
                rd.daemon = True  # close the main program even if there are threads left
                objectsOfWhichThisRemoteNodeIsAlreadyAware = {}
                rd.setup(sock, HOST, PORT, self.streamNumber,
                         objectsOfWhichThisRemoteNodeIsAlreadyAware)
                rd.start()
                shared.printLock.acquire()
                print self, 'connected to', HOST, 'during an outgoing attempt.'
                shared.printLock.release()

                sd = sendDataThread()
                sd.setup(sock, HOST, PORT, self.streamNumber,
                         objectsOfWhichThisRemoteNodeIsAlreadyAware)
                sd.start()
                sd.sendVersionMessage()

            except socks.GeneralProxyError as err:
                if verbose >= 2:
                    shared.printLock.acquire()
                    print 'Could NOT connect to', HOST, 'during outgoing attempt.', err
                    shared.printLock.release()
                PORT, timeLastSeen = shared.knownNodes[
                    self.streamNumber][HOST]
                if (int(time.time()) - timeLastSeen) > 172800 and len(shared.knownNodes[self.streamNumber]) > 1000:  # for nodes older than 48 hours old if we have more than 1000 hosts in our list, delete from the shared.knownNodes data-structure.
                    shared.knownNodesLock.acquire()
                    del shared.knownNodes[self.streamNumber][HOST]
                    shared.knownNodesLock.release()
                    shared.printLock.acquire()
                    print 'deleting ', HOST, 'from shared.knownNodes because it is more than 48 hours old and we could not connect to it.'
                    shared.printLock.release()
            except socks.Socks5AuthError as err:
                shared.UISignalQueue.put((
                    'updateStatusBar', _translate(
                    "MainWindow", "SOCKS5 Authentication problem: %1").arg(str(err))))
            except socks.Socks5Error as err:
                pass
                print 'SOCKS5 error. (It is possible that the server wants authentication).)', str(err)
            except socks.Socks4Error as err:
                print 'Socks4Error:', err
            except socket.error as err:
                if shared.config.get('bitmessagesettings', 'socksproxytype')[0:5] == 'SOCKS':
                    print 'Bitmessage MIGHT be having trouble connecting to the SOCKS server. ' + str(err)
                else:
                    if verbose >= 1:
                        shared.printLock.acquire()
                        print 'Could NOT connect to', HOST, 'during outgoing attempt.', err
                        shared.printLock.release()
                    PORT, timeLastSeen = shared.knownNodes[
                        self.streamNumber][HOST]
                    if (int(time.time()) - timeLastSeen) > 172800 and len(shared.knownNodes[self.streamNumber]) > 1000:  # for nodes older than 48 hours old if we have more than 1000 hosts in our list, delete from the knownNodes data-structure.
                        shared.knownNodesLock.acquire()
                        del shared.knownNodes[self.streamNumber][HOST]
                        shared.knownNodesLock.release()
                        shared.printLock.acquire()
                        print 'deleting ', HOST, 'from knownNodes because it is more than 48 hours old and we could not connect to it.'
                        shared.printLock.release()
            except Exception as err:
                sys.stderr.write(
                    'An exception has occurred in the outgoingSynSender thread that was not caught by other exception types: %s\n' % err)
            time.sleep(0.1)

# 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 run(self):
        # We don't want to accept incoming connections if the user is using a
        # SOCKS proxy. If they eventually select proxy 'none' then this will
        # start listening for connections.
        while shared.config.get('bitmessagesettings', 'socksproxytype')[0:5] == 'SOCKS':
            time.sleep(300)

        shared.printLock.acquire()
        print 'Listening for incoming connections.'
        shared.printLock.release()
        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 don't want to accept incoming connections if the user is using
            # a SOCKS proxy. If the user eventually select proxy 'none' then
            # this will start listening for connections.
            while shared.config.get('bitmessagesettings', 'socksproxytype')[0:5] == 'SOCKS':
                time.sleep(10)
            while len(shared.connectedHostsList) > 220:
                shared.printLock.acquire()
                print 'We are connected to too many people. Not accepting further incoming connections for ten seconds.'
                shared.printLock.release()
                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:
                shared.printLock.acquire()
                print 'We are already connected to', HOST + '. Ignoring connection.'
                shared.printLock.release()
                a.close()
                a, (HOST, PORT) = sock.accept()
            objectsOfWhichThisRemoteNodeIsAlreadyAware = {}
            a.settimeout(20)

            sd = sendDataThread()
            sd.setup(
                a, HOST, PORT, -1, objectsOfWhichThisRemoteNodeIsAlreadyAware)
            sd.start()

            rd = receiveDataThread()
            rd.daemon = True  # close the main program even if there are threads left
            rd.setup(
                a, HOST, PORT, -1, objectsOfWhichThisRemoteNodeIsAlreadyAware)
            rd.start()

            shared.printLock.acquire()
            print self, 'connected to', HOST, 'during INCOMING request.'
            shared.printLock.release()

# This thread is created either by the synSenderThread(for outgoing
# connections) or the singleListenerThread(for incoming connectiosn).


class receiveDataThread(threading.Thread):

    def __init__(self):
        threading.Thread.__init__(self)
        self.data = ''
        self.verackSent = False
        self.verackReceived = False

    def setup(
        self,
        sock,
        HOST,
        port,
        streamNumber,
            objectsOfWhichThisRemoteNodeIsAlreadyAware):
        self.sock = sock
        self.HOST = HOST
        self.PORT = port
        self.streamNumber = streamNumber
        self.payloadLength = 0  # This is the protocol payload length thus it doesn't include the 24 byte message header
        self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave = {}
        shared.connectedHostsList[
            self.HOST] = 0  # The very fact that this receiveData thread exists shows that we are connected to the remote host. Let's add it to this list so that an outgoingSynSender thread doesn't try to connect to it.
        self.connectionIsOrWasFullyEstablished = False  # set to true after the remote node and I accept each other's version messages. This is needed to allow the user interface to accurately reflect the current number of connections.
        if self.streamNumber == -1:  # This was an incoming connection. Send out a version message if we accept the other node's version message.
            self.initiatedConnection = False
        else:
            self.initiatedConnection = True
            selfInitiatedConnections[streamNumber][self] = 0
        self.ackDataThatWeHaveYetToSend = [
        ]  # When we receive a message bound for us, we store the acknowledgement that we need to send (the ackdata) here until we are done processing all other data received from this peer.
        self.objectsOfWhichThisRemoteNodeIsAlreadyAware = objectsOfWhichThisRemoteNodeIsAlreadyAware

    def run(self):
        shared.printLock.acquire()
        print 'ID of the receiveDataThread is', str(id(self)) + '. The size of the shared.connectedHostsList is now', len(shared.connectedHostsList)
        shared.printLock.release()
        while True:
            try:
                self.data += self.sock.recv(4096)
            except socket.timeout:
                shared.printLock.acquire()
                print 'Timeout occurred waiting for data from', self.HOST + '. Closing receiveData thread. (ID:', str(id(self)) + ')'
                shared.printLock.release()
                break
            except Exception as err:
                shared.printLock.acquire()
                print 'sock.recv error. Closing receiveData thread (HOST:', self.HOST, 'ID:', str(id(self)) + ').', err
                shared.printLock.release()
                break
            # print 'Received', repr(self.data)
            if self.data == "":
                shared.printLock.acquire()
                print 'Connection to', self.HOST, 'closed. Closing receiveData thread. (ID:', str(id(self)) + ')'
                shared.printLock.release()
                break
            else:
                self.processData()

        try:
            del selfInitiatedConnections[self.streamNumber][self]
            shared.printLock.acquire()
            print 'removed self (a receiveDataThread) from selfInitiatedConnections'
            shared.printLock.release()
        except:
            pass
        shared.broadcastToSendDataQueues((0, 'shutdown', self.HOST))
        try:
            del shared.connectedHostsList[self.HOST]
        except Exception as err:
            shared.printLock.acquire()
            print 'Could not delete', self.HOST, 'from shared.connectedHostsList.', err
            shared.printLock.release()
        try:
            del numberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHavePerPeer[
                self.HOST]
        except:
            pass
        shared.UISignalQueue.put(('updateNetworkStatusTab', 'no data'))
        shared.printLock.acquire()
        print 'The size of the connectedHostsList is now:', len(shared.connectedHostsList)
        shared.printLock.release()

    def processData(self):
        global verbose
        # if verbose >= 3:
            # shared.printLock.acquire()
            # print 'self.data is currently ', repr(self.data)
            # shared.printLock.release()
        if len(self.data) < 20:  # if so little of the data has arrived that we can't even unpack the payload length
            return
        if self.data[0:4] != '\xe9\xbe\xb4\xd9':
            if verbose >= 1:
                shared.printLock.acquire()
                print 'The magic bytes were not correct. First 40 bytes of data: ' + repr(self.data[0:40])
                shared.printLock.release()
            self.data = ""
            return
        self.payloadLength, = unpack('>L', self.data[16:20])
        if len(self.data) < self.payloadLength + 24:  # check if the whole message has arrived yet.
            return
        if self.data[20:24] != hashlib.sha512(self.data[24:self.payloadLength + 24]).digest()[0:4]:  # test the checksum in the message. If it is correct...
            print 'Checksum incorrect. Clearing this message.'
            self.data = self.data[self.payloadLength + 24:]
            self.processData()
            return
        # The time we've last seen this node is obviously right now since we
        # just received valid data from it. So update the knownNodes list so
        # that other peers can be made aware of its existance.
        if self.initiatedConnection and self.connectionIsOrWasFullyEstablished:  # The remote port is only something we should share with others if it is the remote node's incoming port (rather than some random operating-system-assigned outgoing port).
            shared.knownNodesLock.acquire()
            shared.knownNodes[self.streamNumber][
                self.HOST] = (self.PORT, int(time.time()))
            shared.knownNodesLock.release()
        if self.payloadLength <= 180000000:  # If the size of the message is greater than 180MB, ignore it. (I get memory errors when processing messages much larger than this though it is concievable that this value will have to be lowered if some systems are less tolarant of large messages.)
            remoteCommand = self.data[4:16]
            shared.printLock.acquire()
            print 'remoteCommand', repr(remoteCommand.replace('\x00', '')), ' from', self.HOST
            shared.printLock.release()
            if remoteCommand == 'version\x00\x00\x00\x00\x00':
                self.recversion(self.data[24:self.payloadLength + 24])
            elif remoteCommand == 'verack\x00\x00\x00\x00\x00\x00':
                self.recverack()
            elif remoteCommand == 'addr\x00\x00\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished:
                self.recaddr(self.data[24:self.payloadLength + 24])
            elif remoteCommand == 'getpubkey\x00\x00\x00' and self.connectionIsOrWasFullyEstablished:
                self.recgetpubkey(self.data[24:self.payloadLength + 24])
            elif remoteCommand == 'pubkey\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished:
                self.recpubkey(self.data[24:self.payloadLength + 24])
            elif remoteCommand == 'inv\x00\x00\x00\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished:
                self.recinv(self.data[24:self.payloadLength + 24])
            elif remoteCommand == 'getdata\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished:
                self.recgetdata(self.data[24:self.payloadLength + 24])
            elif remoteCommand == 'msg\x00\x00\x00\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished:
                self.recmsg(self.data[24:self.payloadLength + 24])
            elif remoteCommand == 'broadcast\x00\x00\x00' and self.connectionIsOrWasFullyEstablished:
                self.recbroadcast(self.data[24:self.payloadLength + 24])
            elif remoteCommand == 'ping\x00\x00\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished:
                self.sendpong()
            elif remoteCommand == 'pong\x00\x00\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished:
                pass
            elif remoteCommand == 'alert\x00\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished:
                pass

        self.data = self.data[
            self.payloadLength + 24:]  # take this message out and then process the next message
        if self.data == '':
            while len(self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave) > 0:
                random.seed()
                objectHash, = random.sample(
                    self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave, 1)
                if objectHash in shared.inventory:
                    shared.printLock.acquire()
                    print 'Inventory (in memory) already has object listed in inv message.'
                    shared.printLock.release()
                    del self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave[
                        objectHash]
                elif isInSqlInventory(objectHash):
                    if verbose >= 3:
                        shared.printLock.acquire()
                        print 'Inventory (SQL on disk) already has object listed in inv message.'
                        shared.printLock.release()
                    del self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave[
                        objectHash]
                else:
                    self.sendgetdata(objectHash)
                    del self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave[
                        objectHash]  # It is possible that the remote node doesn't respond with the object. In that case, we'll very likely get it from someone else anyway.
                    if len(self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave) == 0:
                        shared.printLock.acquire()
                        print '(concerning', self.HOST + ')', 'number of objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave is now', len(self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave)
                        shared.printLock.release()
                        try:
                            del numberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHavePerPeer[
                                self.HOST]  # this data structure is maintained so that we can keep track of how many total objects, across all connections, are currently outstanding. If it goes too high it can indicate that we are under attack by multiple nodes working together.
                        except:
                            pass
                    break
                if len(self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave) == 0:
                    shared.printLock.acquire()
                    print '(concerning', self.HOST + ')', 'number of objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave is now', len(self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave)
                    shared.printLock.release()
                    try:
                        del numberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHavePerPeer[
                            self.HOST]  # this data structure is maintained so that we can keep track of how many total objects, across all connections, are currently outstanding. If it goes too high it can indicate that we are under attack by multiple nodes working together.
                    except:
                        pass
            if len(self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave) > 0:
                shared.printLock.acquire()
                print '(concerning', self.HOST + ')', 'number of objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave is now', len(self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave)
                shared.printLock.release()
                numberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHavePerPeer[self.HOST] = len(
                    self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave)  # this data structure is maintained so that we can keep track of how many total objects, across all connections, are currently outstanding. If it goes too high it can indicate that we are under attack by multiple nodes working together.
            if len(self.ackDataThatWeHaveYetToSend) > 0:
                self.data = self.ackDataThatWeHaveYetToSend.pop()
        self.processData()

    def isProofOfWorkSufficient(
        self,
        data,
        nonceTrialsPerByte=0,
            payloadLengthExtraBytes=0):
        if nonceTrialsPerByte < shared.networkDefaultProofOfWorkNonceTrialsPerByte:
            nonceTrialsPerByte = shared.networkDefaultProofOfWorkNonceTrialsPerByte
        if payloadLengthExtraBytes < shared.networkDefaultPayloadLengthExtraBytes:
            payloadLengthExtraBytes = shared.networkDefaultPayloadLengthExtraBytes
        POW, = unpack('>Q', hashlib.sha512(hashlib.sha512(data[
                      :8] + hashlib.sha512(data[8:]).digest()).digest()).digest()[0:8])
        # print 'POW:', POW
        return POW <= 2 ** 64 / ((len(data) + payloadLengthExtraBytes) * (nonceTrialsPerByte))

    def sendpong(self):
        print 'Sending pong'
        try:
            self.sock.sendall(
                '\xE9\xBE\xB4\xD9\x70\x6F\x6E\x67\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xcf\x83\xe1\x35')
        except Exception as err:
            # if not 'Bad file descriptor' in err:
            shared.printLock.acquire()
            sys.stderr.write('sock.sendall error: %s\n' % err)
            shared.printLock.release()

    def recverack(self):
        print 'verack received'
        self.verackReceived = True
        if self.verackSent:
            # We have thus both sent and received a verack.
            self.connectionFullyEstablished()

    def connectionFullyEstablished(self):
        self.connectionIsOrWasFullyEstablished = True
        if not self.initiatedConnection:
            shared.UISignalQueue.put(('setStatusIcon', 'green'))
        self.sock.settimeout(
            600)  # We'll send out a pong every 5 minutes to make sure the connection stays alive if there has been no other traffic to send lately.
        shared.UISignalQueue.put(('updateNetworkStatusTab', 'no data'))
        remoteNodeIncomingPort, remoteNodeSeenTime = shared.knownNodes[
            self.streamNumber][self.HOST]
        shared.printLock.acquire()
        print 'Connection fully established with', self.HOST, remoteNodeIncomingPort
        print 'The size of the connectedHostsList is now', len(shared.connectedHostsList)
        print 'The length of sendDataQueues is now:', len(shared.sendDataQueues)
        print 'broadcasting addr from within connectionFullyEstablished function.'
        shared.printLock.release()
        self.broadcastaddr([(int(time.time()), self.streamNumber, 1, self.HOST,
                           remoteNodeIncomingPort)])  # This lets all of our peers know about this new node.
        self.sendaddr()  # This is one large addr message to this one peer.
        if not self.initiatedConnection and len(shared.connectedHostsList) > 200:
            shared.printLock.acquire()
            print 'We are connected to too many people. Closing connection.'
            shared.printLock.release()
            shared.broadcastToSendDataQueues((0, 'shutdown', self.HOST))
            return
        self.sendBigInv()

    def sendBigInv(self):
        shared.sqlLock.acquire()
        # Select all hashes which are younger than two days old and in this
        # stream.
        t = (int(time.time()) - maximumAgeOfObjectsThatIAdvertiseToOthers, int(
            time.time()) - lengthOfTimeToHoldOnToAllPubkeys, self.streamNumber)
        shared.sqlSubmitQueue.put(
            '''SELECT hash FROM inventory WHERE ((receivedtime>? and objecttype<>'pubkey') or (receivedtime>? and objecttype='pubkey')) and streamnumber=?''')
        shared.sqlSubmitQueue.put(t)
        queryreturn = shared.sqlReturnQueue.get()
        shared.sqlLock.release()
        bigInvList = {}
        for row in queryreturn:
            hash, = row
            if hash not in self.objectsOfWhichThisRemoteNodeIsAlreadyAware:
                bigInvList[hash] = 0
        # We also have messages in our inventory in memory (which is a python
        # dictionary). Let's fetch those too.
        for hash, storedValue in shared.inventory.items():
            if hash not in self.objectsOfWhichThisRemoteNodeIsAlreadyAware:
                objectType, streamNumber, payload, receivedTime = storedValue
                if streamNumber == self.streamNumber and receivedTime > int(time.time()) - maximumAgeOfObjectsThatIAdvertiseToOthers:
                    bigInvList[hash] = 0
        numberOfObjectsInInvMessage = 0
        payload = ''
        # Now let us start appending all of these hashes together. They will be
        # sent out in a big inv message to our new peer.
        for hash, storedValue in bigInvList.items():
            payload += hash
            numberOfObjectsInInvMessage += 1
            if numberOfObjectsInInvMessage >= 50000:  # We can only send a max of 50000 items per inv message but we may have more objects to advertise. They must be split up into multiple inv messages.
                self.sendinvMessageToJustThisOnePeer(
                    numberOfObjectsInInvMessage, payload)
                payload = ''
                numberOfObjectsInInvMessage = 0
        if numberOfObjectsInInvMessage > 0:
            self.sendinvMessageToJustThisOnePeer(
                numberOfObjectsInInvMessage, payload)

    # Self explanatory. Notice that there is also a broadcastinv function for
    # broadcasting invs to everyone in our stream.
    def sendinvMessageToJustThisOnePeer(self, numberOfObjects, payload):
        payload = encodeVarint(numberOfObjects) + payload
        headerData = '\xe9\xbe\xb4\xd9'  # magic bits, slighly different from Bitcoin's magic bits.
        headerData += 'inv\x00\x00\x00\x00\x00\x00\x00\x00\x00'
        headerData += pack('>L', len(payload))
        headerData += hashlib.sha512(payload).digest()[:4]
        shared.printLock.acquire()
        print 'Sending huge inv message with', numberOfObjects, 'objects to just this one peer'
        shared.printLock.release()
        try:
            self.sock.sendall(headerData + payload)
        except Exception as err:
            # if not 'Bad file descriptor' in err:
            shared.printLock.acquire()
            sys.stderr.write('sock.sendall error: %s\n' % err)
            shared.printLock.release()

    # We have received a broadcast message
    def recbroadcast(self, data):
        self.messageProcessingStartTime = time.time()
        # First we must check to make sure the proof of work is sufficient.
        if not self.isProofOfWorkSufficient(data):
            print 'Proof of work in broadcast message insufficient.'
            return
        readPosition = 8  # bypass the nonce
        embeddedTime, = unpack('>I', data[readPosition:readPosition + 4])

        # This section is used for the transition from 32 bit time to 64 bit
        # time in the protocol.
        if embeddedTime == 0:
            embeddedTime, = unpack('>Q', data[readPosition:readPosition + 8])
            readPosition += 8
        else:
            readPosition += 4

        if embeddedTime > (int(time.time()) + 10800):  # prevent funny business
            print 'The embedded time in this broadcast message is more than three hours in the future. That doesn\'t make sense. Ignoring message.'
            return
        if embeddedTime < (int(time.time()) - maximumAgeOfAnObjectThatIAmWillingToAccept):
            print 'The embedded time in this broadcast message is too old. Ignoring message.'
            return
        if len(data) < 180:
            print 'The payload length of this broadcast packet is unreasonably low. Someone is probably trying funny business. Ignoring message.'
            return
        # Let us check to make sure the stream number is correct (thus
        # preventing an individual from sending broadcasts out on the wrong
        # streams or all streams).
        broadcastVersion, broadcastVersionLength = decodeVarint(
            data[readPosition:readPosition + 10])
        if broadcastVersion >= 2:
            streamNumber, streamNumberLength = decodeVarint(data[
                                                            readPosition + broadcastVersionLength:readPosition + broadcastVersionLength + 10])
            if streamNumber != self.streamNumber:
                print 'The stream number encoded in this broadcast message (' + str(streamNumber) + ') does not match the stream number on which it was received. Ignoring it.'
                return

        shared.inventoryLock.acquire()
        self.inventoryHash = calculateInventoryHash(data)
        if self.inventoryHash in shared.inventory:
            print 'We have already received this broadcast object. Ignoring.'
            shared.inventoryLock.release()
            return
        elif isInSqlInventory(self.inventoryHash):
            print 'We have already received this broadcast object (it is stored on disk in the SQL inventory). Ignoring it.'
            shared.inventoryLock.release()
            return
        # It is valid so far. Let's let our peers know about it.
        objectType = 'broadcast'
        shared.inventory[self.inventoryHash] = (
            objectType, self.streamNumber, data, embeddedTime)