769 lines
44 KiB
Python
769 lines
44 KiB
Python
doTimingAttackMitigation = False
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import errno
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import time
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import threading
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import shared
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import hashlib
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import os
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import select
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import socket
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import random
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import ssl
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from struct import unpack, pack
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import sys
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import traceback
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#import string
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#from subprocess import call # used when the API must execute an outside program
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#from pyelliptic.openssl import OpenSSL
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#import highlevelcrypto
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from addresses import *
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from helper_generic import addDataPadding, isHostInPrivateIPRange
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from helper_sql import sqlQuery
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from debug import logger
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# This thread is created either by the synSenderThread(for outgoing
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# connections) or the singleListenerThread(for incoming connections).
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class receiveDataThread(threading.Thread):
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def __init__(self):
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threading.Thread.__init__(self, name="receiveData")
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self.data = ''
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self.verackSent = False
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self.verackReceived = False
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def setup(
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self,
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sock,
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HOST,
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port,
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streamNumber,
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someObjectsOfWhichThisRemoteNodeIsAlreadyAware,
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selfInitiatedConnections,
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sendDataThreadQueue):
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self.sock = sock
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self.peer = shared.Peer(HOST, port)
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self.name = "receiveData-" + self.peer.host
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self.streamNumber = streamNumber
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self.objectsThatWeHaveYetToGetFromThisPeer = {}
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self.selfInitiatedConnections = selfInitiatedConnections
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self.sendDataThreadQueue = sendDataThreadQueue # used to send commands and data to the sendDataThread
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shared.connectedHostsList[
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self.peer.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.
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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.
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self.services = 0
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if self.streamNumber == -1: # This was an incoming connection. Send out a version message if we accept the other node's version message.
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self.initiatedConnection = False
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else:
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self.initiatedConnection = True
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self.selfInitiatedConnections[streamNumber][self] = 0
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self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware = someObjectsOfWhichThisRemoteNodeIsAlreadyAware
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def run(self):
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logger.debug('receiveDataThread starting. ID ' + str(id(self)) + '. The size of the shared.connectedHostsList is now ' + str(len(shared.connectedHostsList)))
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while True:
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if shared.config.getint('bitmessagesettings', 'maxdownloadrate') == 0:
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downloadRateLimitBytes = float("inf")
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else:
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downloadRateLimitBytes = shared.config.getint('bitmessagesettings', 'maxdownloadrate') * 1000
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with shared.receiveDataLock:
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while shared.numberOfBytesReceivedLastSecond >= downloadRateLimitBytes:
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if int(time.time()) == shared.lastTimeWeResetBytesReceived:
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# If it's still the same second that it was last time then sleep.
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time.sleep(0.3)
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else:
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# It's a new second. Let us clear the shared.numberOfBytesReceivedLastSecond.
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shared.lastTimeWeResetBytesReceived = int(time.time())
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shared.numberOfBytesReceivedLastSecond = 0
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dataLen = len(self.data)
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try:
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if ((self.services & shared.NODE_SSL == shared.NODE_SSL) and
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self.connectionIsOrWasFullyEstablished and
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shared.haveSSL(not self.initiatedConnection)):
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dataRecv = self.sslSock.recv(1024)
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else:
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dataRecv = self.sock.recv(1024)
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self.data += dataRecv
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shared.numberOfBytesReceived += len(dataRecv) # for the 'network status' UI tab. The UI clears this value whenever it updates.
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shared.numberOfBytesReceivedLastSecond += len(dataRecv) # for the download rate limit
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except socket.timeout:
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logger.error ('Timeout occurred waiting for data from ' + str(self.peer) + '. Closing receiveData thread. (ID: ' + str(id(self)) + ')')
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break
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except Exception as err:
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if (sys.platform == 'win32' and err.errno in ([2, 10035])) or (sys.platform != 'win32' and err.errno == errno.EWOULDBLOCK):
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select.select([self.sslSock], [], [])
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continue
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logger.error('sock.recv error. Closing receiveData thread (' + str(self.peer) + ', Thread ID: ' + str(id(self)) + ').' + str(err.errno) + "/" + str(err))
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break
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# print 'Received', repr(self.data)
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if len(self.data) == dataLen: # If self.sock.recv returned no data:
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logger.debug('Connection to ' + str(self.peer) + ' closed. Closing receiveData thread. (ID: ' + str(id(self)) + ')')
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break
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else:
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self.processData()
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try:
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del self.selfInitiatedConnections[self.streamNumber][self]
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logger.debug('removed self (a receiveDataThread) from selfInitiatedConnections')
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except:
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pass
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self.sendDataThreadQueue.put((0, 'shutdown','no data')) # commands the corresponding sendDataThread to shut itself down.
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try:
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del shared.connectedHostsList[self.peer.host]
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except Exception as err:
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logger.error('Could not delete ' + str(self.peer.host) + ' from shared.connectedHostsList.' + str(err))
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try:
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del shared.numberOfObjectsThatWeHaveYetToGetPerPeer[
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self.peer]
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except:
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pass
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shared.UISignalQueue.put(('updateNetworkStatusTab', 'no data'))
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logger.debug('receiveDataThread ending. ID ' + str(id(self)) + '. The size of the shared.connectedHostsList is now ' + str(len(shared.connectedHostsList)))
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def processData(self):
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if len(self.data) < shared.Header.size: # if so little of the data has arrived that we can't even read the checksum then wait for more data.
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return
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magic,command,payloadLength,checksum = shared.Header.unpack(self.data[:shared.Header.size])
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if magic != 0xE9BEB4D9:
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self.data = ""
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return
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if payloadLength > 1600100: # ~1.6 MB which is the maximum possible size of an inv message.
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logger.info('The incoming message, which we have not yet download, is too large. Ignoring it. (unfortunately there is no way to tell the other node to stop sending it except to disconnect.) Message size: %s' % payloadLength)
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self.data = self.data[payloadLength + shared.Header.size:]
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del magic,command,payloadLength,checksum # we don't need these anymore and better to clean them now before the recursive call rather than after
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self.processData()
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return
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if len(self.data) < payloadLength + shared.Header.size: # check if the whole message has arrived yet.
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return
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payload = self.data[shared.Header.size:payloadLength + shared.Header.size]
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if checksum != hashlib.sha512(payload).digest()[0:4]: # test the checksum in the message.
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logger.error('Checksum incorrect. Clearing this message.')
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self.data = self.data[payloadLength + shared.Header.size:]
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del magic,command,payloadLength,checksum,payload # better to clean up before the recursive call
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self.processData()
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return
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# The time we've last seen this node is obviously right now since we
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# just received valid data from it. So update the knownNodes list so
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# that other peers can be made aware of its existance.
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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).
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with shared.knownNodesLock:
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shared.knownNodes[self.streamNumber][self.peer] = int(time.time())
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#Strip the nulls
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command = command.rstrip('\x00')
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logger.debug('remoteCommand ' + repr(command) + ' from ' + str(self.peer))
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try:
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#TODO: Use a dispatcher here
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if command == 'error':
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self.recerror(payload)
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elif not self.connectionIsOrWasFullyEstablished:
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if command == 'version':
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self.recversion(payload)
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elif command == 'verack':
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self.recverack()
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else:
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if command == 'addr':
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self.recaddr(payload)
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elif command == 'inv':
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self.recinv(payload)
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elif command == 'getdata':
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self.recgetdata(payload)
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elif command == 'object':
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self.recobject(payload)
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elif command == 'ping':
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self.sendpong(payload)
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#elif command == 'pong':
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# pass
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except varintDecodeError as e:
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logger.debug("There was a problem with a varint while processing a message from the wire. Some details: %s" % e)
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except Exception as e:
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logger.critical("Critical error in a receiveDataThread: \n%s" % traceback.format_exc())
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del payload
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self.data = self.data[payloadLength + shared.Header.size:] # take this message out and then process the next message
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if self.data == '': # if there are no more messages
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while len(self.objectsThatWeHaveYetToGetFromThisPeer) > 0:
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shared.numberOfInventoryLookupsPerformed += 1
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objectHash, = random.sample(
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self.objectsThatWeHaveYetToGetFromThisPeer, 1)
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if objectHash in shared.inventory:
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logger.debug('Inventory (in memory) already has object listed in inv message.')
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del self.objectsThatWeHaveYetToGetFromThisPeer[
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objectHash]
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elif shared.isInSqlInventory(objectHash):
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if shared.verbose >= 3:
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logger.debug('Inventory (SQL on disk) already has object listed in inv message.')
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del self.objectsThatWeHaveYetToGetFromThisPeer[
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objectHash]
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else:
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# We don't have the object in our inventory. Let's request it.
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self.sendgetdata(objectHash)
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del self.objectsThatWeHaveYetToGetFromThisPeer[
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objectHash] # It is possible that the remote node might not respond with the object. In that case, we'll very likely get it from someone else anyway.
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if len(self.objectsThatWeHaveYetToGetFromThisPeer) == 0:
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logger.debug('(concerning' + str(self.peer) + ') number of objectsThatWeHaveYetToGetFromThisPeer is now 0')
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try:
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del shared.numberOfObjectsThatWeHaveYetToGetPerPeer[
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self.peer] # 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.
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except:
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pass
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break
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if len(self.objectsThatWeHaveYetToGetFromThisPeer) == 0:
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# We had objectsThatWeHaveYetToGetFromThisPeer but the loop ran, they were all in our inventory, and now we don't have any to get anymore.
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logger.debug('(concerning' + str(self.peer) + ') number of objectsThatWeHaveYetToGetFromThisPeer is now 0')
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try:
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del shared.numberOfObjectsThatWeHaveYetToGetPerPeer[
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self.peer] # 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.
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except:
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pass
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if len(self.objectsThatWeHaveYetToGetFromThisPeer) > 0:
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logger.debug('(concerning' + str(self.peer) + ') number of objectsThatWeHaveYetToGetFromThisPeer is now ' + str(len(self.objectsThatWeHaveYetToGetFromThisPeer)))
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shared.numberOfObjectsThatWeHaveYetToGetPerPeer[self.peer] = len(
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self.objectsThatWeHaveYetToGetFromThisPeer) # 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.
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self.processData()
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def sendpong(self):
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logger.debug('Sending pong')
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self.sendDataThreadQueue.put((0, 'sendRawData', shared.CreatePacket('pong')))
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def recverack(self):
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logger.debug('verack received')
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self.verackReceived = True
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if self.verackSent:
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# We have thus both sent and received a verack.
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self.connectionFullyEstablished()
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def connectionFullyEstablished(self):
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if self.connectionIsOrWasFullyEstablished:
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# there is no reason to run this function a second time
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return
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self.connectionIsOrWasFullyEstablished = True
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self.sslSock = self.sock
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if ((self.services & shared.NODE_SSL == shared.NODE_SSL) and
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shared.haveSSL(not self.initiatedConnection)):
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logger.debug("Initialising TLS")
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self.sslSock = ssl.wrap_socket(self.sock, keyfile = os.path.join(shared.codePath(), 'sslkeys', 'key.pem'), certfile = os.path.join(shared.codePath(), 'sslkeys', 'cert.pem'), server_side = not self.initiatedConnection, ssl_version=ssl.PROTOCOL_TLSv1, do_handshake_on_connect=False, ciphers='AECDH-AES256-SHA')
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if hasattr(self.sslSock, "context"):
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self.sslSock.context.set_ecdh_curve("secp256k1")
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while True:
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try:
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self.sslSock.do_handshake()
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break
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except ssl.SSLError as e:
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if e.errno == 2:
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select.select([self.sslSock], [self.sslSock], [])
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else:
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break
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except:
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break
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# Command the corresponding sendDataThread to set its own connectionIsOrWasFullyEstablished variable to True also
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self.sendDataThreadQueue.put((0, 'connectionIsOrWasFullyEstablished', (self.services, self.sslSock)))
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if not self.initiatedConnection:
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shared.clientHasReceivedIncomingConnections = True
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shared.UISignalQueue.put(('setStatusIcon', 'green'))
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self.sock.settimeout(
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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.
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shared.UISignalQueue.put(('updateNetworkStatusTab', 'no data'))
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logger.debug('Connection fully established with ' + str(self.peer) + "\n" + \
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'The size of the connectedHostsList is now ' + str(len(shared.connectedHostsList)) + "\n" + \
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'The length of sendDataQueues is now: ' + str(len(shared.sendDataQueues)) + "\n" + \
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'broadcasting addr from within connectionFullyEstablished function.')
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# Let all of our peers know about this new node.
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dataToSend = (int(time.time()), self.streamNumber, 1, self.peer.host, self.remoteNodeIncomingPort)
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shared.broadcastToSendDataQueues((
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self.streamNumber, 'advertisepeer', dataToSend))
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self.sendaddr() # This is one large addr message to this one peer.
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if not self.initiatedConnection and len(shared.connectedHostsList) > 200:
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logger.info ('We are connected to too many people. Closing connection.')
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self.sendDataThreadQueue.put((0, 'shutdown','no data'))
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return
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self.sendBigInv()
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def sendBigInv(self):
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# Select all hashes for objects in this stream.
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queryreturn = sqlQuery(
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'''SELECT hash FROM inventory WHERE expirestime>? and streamnumber=?''',
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int(time.time()),
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self.streamNumber)
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bigInvList = {}
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for row in queryreturn:
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hash, = row
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if hash not in self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware:
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bigInvList[hash] = 0
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# We also have messages in our inventory in memory (which is a python
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# dictionary). Let's fetch those too.
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with shared.inventoryLock:
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for hash, storedValue in shared.inventory.items():
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if hash not in self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware:
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objectType, streamNumber, payload, expiresTime, tag = storedValue
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if streamNumber == self.streamNumber and expiresTime > int(time.time()):
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bigInvList[hash] = 0
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numberOfObjectsInInvMessage = 0
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payload = ''
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# Now let us start appending all of these hashes together. They will be
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# sent out in a big inv message to our new peer.
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for hash, storedValue in bigInvList.items():
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payload += hash
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numberOfObjectsInInvMessage += 1
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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.
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self.sendinvMessageToJustThisOnePeer(
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numberOfObjectsInInvMessage, payload)
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payload = ''
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numberOfObjectsInInvMessage = 0
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if numberOfObjectsInInvMessage > 0:
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self.sendinvMessageToJustThisOnePeer(
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numberOfObjectsInInvMessage, payload)
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# Used to send a big inv message when the connection with a node is
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# first fully established. Notice that there is also a broadcastinv
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# function for broadcasting invs to everyone in our stream.
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def sendinvMessageToJustThisOnePeer(self, numberOfObjects, payload):
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payload = encodeVarint(numberOfObjects) + payload
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logger.debug('Sending huge inv message with ' + str(numberOfObjects) + ' objects to just this one peer')
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self.sendDataThreadQueue.put((0, 'sendRawData', shared.CreatePacket('inv', payload)))
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def _sleepForTimingAttackMitigation(self, sleepTime):
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# We don't need to do the timing attack mitigation if we are
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# only connected to the trusted peer because we can trust the
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# peer not to attack
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if sleepTime > 0 and doTimingAttackMitigation and shared.trustedPeer == None:
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logger.debug('Timing attack mitigation: Sleeping for ' + str(sleepTime) + ' seconds.')
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time.sleep(sleepTime)
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def recerror(self, data):
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"""
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The remote node has been polite enough to send you an error message.
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"""
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fatalStatus, readPosition = decodeVarint(data[:10])
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banTime, banTimeLength = decodeVarint(data[readPosition:readPosition+10])
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readPosition += banTimeLength
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inventoryVectorLength, inventoryVectorLengthLength = decodeVarint(data[readPosition:readPosition+10])
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if inventoryVectorLength > 100:
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return
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readPosition += inventoryVectorLengthLength
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inventoryVector = data[readPosition:readPosition+inventoryVectorLength]
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readPosition += inventoryVectorLength
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errorTextLength, errorTextLengthLength = decodeVarint(data[readPosition:readPosition+10])
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if errorTextLength > 1000:
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return
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readPosition += errorTextLengthLength
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errorText = data[readPosition:readPosition+errorTextLength]
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if fatalStatus == 0:
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fatalHumanFriendly = 'Warning'
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elif fatalStatus == 1:
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fatalHumanFriendly = 'Error'
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elif fatalStatus == 2:
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fatalHumanFriendly = 'Fatal'
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message = '%s message received from %s: %s.' % (fatalHumanFriendly, self.peer, errorText)
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if inventoryVector:
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message += " This concerns object %s" % inventoryVector.encode('hex')
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if banTime > 0:
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message += " Remote node says that the ban time is %s" % banTime
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logger.error(message)
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def recobject(self, data):
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self.messageProcessingStartTime = time.time()
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lengthOfTimeWeShouldUseToProcessThisMessage = shared.checkAndShareObjectWithPeers(data)
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"""
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Sleeping will help guarantee that we can process messages faster than a
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remote node can send them. If we fall behind, the attacker could observe
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that we are are slowing down the rate at which we request objects from the
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network which would indicate that we own a particular address (whichever
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one to which they are sending all of their attack messages). Note
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that if an attacker connects to a target with many connections, this
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mitigation mechanism might not be sufficient.
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"""
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sleepTime = lengthOfTimeWeShouldUseToProcessThisMessage - (time.time() - self.messageProcessingStartTime)
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self._sleepForTimingAttackMitigation(sleepTime)
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# We have received an inv message
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def recinv(self, data):
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totalNumberOfobjectsThatWeHaveYetToGetFromAllPeers = 0 # this counts duplicates separately because they take up memory
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if len(shared.numberOfObjectsThatWeHaveYetToGetPerPeer) > 0:
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for key, value in shared.numberOfObjectsThatWeHaveYetToGetPerPeer.items():
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totalNumberOfobjectsThatWeHaveYetToGetFromAllPeers += value
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logger.debug('number of keys(hosts) in shared.numberOfObjectsThatWeHaveYetToGetPerPeer: ' + str(len(shared.numberOfObjectsThatWeHaveYetToGetPerPeer)) + "\n" + \
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'totalNumberOfobjectsThatWeHaveYetToGetFromAllPeers = ' + str(totalNumberOfobjectsThatWeHaveYetToGetFromAllPeers))
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numberOfItemsInInv, lengthOfVarint = decodeVarint(data[:10])
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if numberOfItemsInInv > 50000:
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sys.stderr.write('Too many items in inv message!')
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return
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if len(data) < lengthOfVarint + (numberOfItemsInInv * 32):
|
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logger.info('inv message doesn\'t contain enough data. Ignoring.')
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return
|
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if numberOfItemsInInv == 1: # we'll just request this data from the person who advertised the object.
|
|
if totalNumberOfobjectsThatWeHaveYetToGetFromAllPeers > 200000 and len(self.objectsThatWeHaveYetToGetFromThisPeer) > 1000 and shared.trustedPeer == None: # inv flooding attack mitigation
|
|
logger.debug('We already have ' + str(totalNumberOfobjectsThatWeHaveYetToGetFromAllPeers) + ' items yet to retrieve from peers and over 1000 from this node in particular. Ignoring this inv message.')
|
|
return
|
|
self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware[
|
|
data[lengthOfVarint:32 + lengthOfVarint]] = 0
|
|
shared.numberOfInventoryLookupsPerformed += 1
|
|
if data[lengthOfVarint:32 + lengthOfVarint] in shared.inventory:
|
|
logger.debug('Inventory (in memory) has inventory item already.')
|
|
elif shared.isInSqlInventory(data[lengthOfVarint:32 + lengthOfVarint]):
|
|
logger.debug('Inventory (SQL on disk) has inventory item already.')
|
|
else:
|
|
self.sendgetdata(data[lengthOfVarint:32 + lengthOfVarint])
|
|
else:
|
|
# There are many items listed in this inv message. Let us create a
|
|
# 'set' of objects we are aware of and a set of objects in this inv
|
|
# message so that we can diff one from the other cheaply.
|
|
startTime = time.time()
|
|
advertisedSet = set()
|
|
for i in range(numberOfItemsInInv):
|
|
advertisedSet.add(data[lengthOfVarint + (32 * i):32 + lengthOfVarint + (32 * i)])
|
|
objectsNewToMe = advertisedSet - shared.inventorySets[self.streamNumber]
|
|
logger.info('inv message lists %s objects. Of those %s are new to me. It took %s seconds to figure that out.', numberOfItemsInInv, len(objectsNewToMe), time.time()-startTime)
|
|
for item in objectsNewToMe:
|
|
if totalNumberOfobjectsThatWeHaveYetToGetFromAllPeers > 200000 and len(self.objectsThatWeHaveYetToGetFromThisPeer) > 1000 and shared.trustedPeer == None: # inv flooding attack mitigation
|
|
logger.debug('We already have ' + str(totalNumberOfobjectsThatWeHaveYetToGetFromAllPeers) + ' items yet to retrieve from peers and over ' + str(len(self.objectsThatWeHaveYetToGetFromThisPeer)), ' from this node in particular. Ignoring the rest of this inv message.')
|
|
break
|
|
self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware[item] = 0 # helps us keep from sending inv messages to peers that already know about the objects listed therein
|
|
self.objectsThatWeHaveYetToGetFromThisPeer[item] = 0 # upon finishing dealing with an incoming message, the receiveDataThread will request a random object of from peer out of this data structure. This way if we get multiple inv messages from multiple peers which list mostly the same objects, we will make getdata requests for different random objects from the various peers.
|
|
if len(self.objectsThatWeHaveYetToGetFromThisPeer) > 0:
|
|
shared.numberOfObjectsThatWeHaveYetToGetPerPeer[
|
|
self.peer] = len(self.objectsThatWeHaveYetToGetFromThisPeer)
|
|
|
|
# Send a getdata message to our peer to request the object with the given
|
|
# hash
|
|
def sendgetdata(self, hash):
|
|
logger.debug('sending getdata to retrieve object with hash: ' + hash.encode('hex'))
|
|
payload = '\x01' + hash
|
|
self.sendDataThreadQueue.put((0, 'sendRawData', shared.CreatePacket('getdata', payload)))
|
|
|
|
|
|
# We have received a getdata request from our peer
|
|
def recgetdata(self, data):
|
|
numberOfRequestedInventoryItems, lengthOfVarint = decodeVarint(
|
|
data[:10])
|
|
if len(data) < lengthOfVarint + (32 * numberOfRequestedInventoryItems):
|
|
logger.debug('getdata message does not contain enough data. Ignoring.')
|
|
return
|
|
for i in xrange(numberOfRequestedInventoryItems):
|
|
hash = data[lengthOfVarint + (
|
|
i * 32):32 + lengthOfVarint + (i * 32)]
|
|
logger.debug('received getdata request for item:' + hash.encode('hex'))
|
|
|
|
shared.numberOfInventoryLookupsPerformed += 1
|
|
shared.inventoryLock.acquire()
|
|
if hash in shared.inventory:
|
|
objectType, streamNumber, payload, expiresTime, tag = shared.inventory[hash]
|
|
shared.inventoryLock.release()
|
|
self.sendObject(payload)
|
|
else:
|
|
shared.inventoryLock.release()
|
|
queryreturn = sqlQuery(
|
|
'''select payload from inventory where hash=? and expirestime>=?''',
|
|
hash,
|
|
int(time.time()))
|
|
if queryreturn != []:
|
|
for row in queryreturn:
|
|
payload, = row
|
|
self.sendObject(payload)
|
|
else:
|
|
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,))
|
|
|
|
# Our peer has requested (in a getdata message) that we send an object.
|
|
def sendObject(self, payload):
|
|
logger.debug('sending an object.')
|
|
self.sendDataThreadQueue.put((0, 'sendRawData', shared.CreatePacket('object',payload)))
|
|
|
|
|
|
def _checkIPv4Address(self, host, hostStandardFormat):
|
|
# print 'hostStandardFormat', 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 True
|
|
|
|
def _checkIPv6Address(self, 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 True
|
|
|
|
# We have received an addr message.
|
|
def recaddr(self, data):
|
|
numberOfAddressesIncluded, lengthOfNumberOfAddresses = decodeVarint(
|
|
data[:10])
|
|
|
|
if shared.verbose >= 1:
|
|
logger.debug('addr message contains ' + str(numberOfAddressesIncluded) + ' IP addresses.')
|
|
|
|
if numberOfAddressesIncluded > 1000 or numberOfAddressesIncluded == 0:
|
|
return
|
|
if len(data) != lengthOfNumberOfAddresses + (38 * numberOfAddressesIncluded):
|
|
logger.debug('addr message does not contain the correct amount of data. Ignoring.')
|
|
return
|
|
|
|
for i in range(0, numberOfAddressesIncluded):
|
|
fullHost = data[20 + lengthOfNumberOfAddresses + (38 * i):36 + lengthOfNumberOfAddresses + (38 * i)]
|
|
recaddrStream, = unpack('>I', data[8 + lengthOfNumberOfAddresses + (
|
|
38 * i):12 + lengthOfNumberOfAddresses + (38 * i)])
|
|
if recaddrStream == 0:
|
|
continue
|
|
if recaddrStream != self.streamNumber and recaddrStream != (self.streamNumber * 2) and recaddrStream != ((self.streamNumber * 2) + 1): # if the embedded stream number is not in my stream or either of my child streams then ignore it. Someone might be trying funny business.
|
|
continue
|
|
recaddrServices, = unpack('>Q', data[12 + lengthOfNumberOfAddresses + (
|
|
38 * i):20 + lengthOfNumberOfAddresses + (38 * i)])
|
|
recaddrPort, = unpack('>H', data[36 + lengthOfNumberOfAddresses + (
|
|
38 * i):38 + lengthOfNumberOfAddresses + (38 * i)])
|
|
if fullHost[0:12] == '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF':
|
|
ipv4Host = fullHost[12:]
|
|
hostStandardFormat = socket.inet_ntop(socket.AF_INET, ipv4Host)
|
|
if not self._checkIPv4Address(ipv4Host, hostStandardFormat):
|
|
continue
|
|
else:
|
|
hostStandardFormat = socket.inet_ntop(socket.AF_INET6, fullHost)
|
|
if hostStandardFormat == "":
|
|
# This can happen on Windows systems which are not 64-bit compatible
|
|
# so let us drop the IPv6 address.
|
|
continue
|
|
if not self._checkIPv6Address(fullHost, hostStandardFormat):
|
|
continue
|
|
timeSomeoneElseReceivedMessageFromThisNode, = unpack('>Q', data[lengthOfNumberOfAddresses + (
|
|
38 * i):8 + lengthOfNumberOfAddresses + (38 * i)]) # This is the 'time' value in the received addr message. 64-bit.
|
|
if recaddrStream not in shared.knownNodes: # knownNodes is a dictionary of dictionaries with one outer dictionary for each stream. If the outer stream dictionary doesn't exist yet then we must make it.
|
|
with shared.knownNodesLock:
|
|
shared.knownNodes[recaddrStream] = {}
|
|
peerFromAddrMessage = shared.Peer(hostStandardFormat, recaddrPort)
|
|
if peerFromAddrMessage not in shared.knownNodes[recaddrStream]:
|
|
if len(shared.knownNodes[recaddrStream]) < 20000 and timeSomeoneElseReceivedMessageFromThisNode > (int(time.time()) - 10800) and timeSomeoneElseReceivedMessageFromThisNode < (int(time.time()) + 10800): # If we have more than 20000 nodes in our list already then just forget about adding more. Also, make sure that the time that someone else received a message from this node is within three hours from now.
|
|
with shared.knownNodesLock:
|
|
shared.knownNodes[recaddrStream][peerFromAddrMessage] = timeSomeoneElseReceivedMessageFromThisNode
|
|
logger.debug('added new node ' + str(peerFromAddrMessage) + ' to knownNodes in stream ' + str(recaddrStream))
|
|
|
|
shared.needToWriteKnownNodesToDisk = True
|
|
hostDetails = (
|
|
timeSomeoneElseReceivedMessageFromThisNode,
|
|
recaddrStream, recaddrServices, hostStandardFormat, recaddrPort)
|
|
shared.broadcastToSendDataQueues((
|
|
self.streamNumber, 'advertisepeer', hostDetails))
|
|
else:
|
|
timeLastReceivedMessageFromThisNode = shared.knownNodes[recaddrStream][
|
|
peerFromAddrMessage]
|
|
if (timeLastReceivedMessageFromThisNode < timeSomeoneElseReceivedMessageFromThisNode) and (timeSomeoneElseReceivedMessageFromThisNode < int(time.time())+900): # 900 seconds for wiggle-room in case other nodes' clocks aren't quite right.
|
|
with shared.knownNodesLock:
|
|
shared.knownNodes[recaddrStream][peerFromAddrMessage] = timeSomeoneElseReceivedMessageFromThisNode
|
|
|
|
logger.debug('knownNodes currently has ' + str(len(shared.knownNodes[self.streamNumber])) + ' nodes for this stream.')
|
|
|
|
|
|
# Send a huge addr message to our peer. This is only used
|
|
# when we fully establish a connection with a
|
|
# peer (with the full exchange of version and verack
|
|
# messages).
|
|
def sendaddr(self):
|
|
addrsInMyStream = {}
|
|
addrsInChildStreamLeft = {}
|
|
addrsInChildStreamRight = {}
|
|
# print 'knownNodes', shared.knownNodes
|
|
|
|
# We are going to share a maximum number of 1000 addrs with our peer.
|
|
# 500 from this stream, 250 from the left child stream, and 250 from
|
|
# the right child stream.
|
|
with shared.knownNodesLock:
|
|
if len(shared.knownNodes[self.streamNumber]) > 0:
|
|
for i in range(500):
|
|
peer, = random.sample(shared.knownNodes[self.streamNumber], 1)
|
|
if isHostInPrivateIPRange(peer.host):
|
|
continue
|
|
addrsInMyStream[peer] = shared.knownNodes[
|
|
self.streamNumber][peer]
|
|
if len(shared.knownNodes[self.streamNumber * 2]) > 0:
|
|
for i in range(250):
|
|
peer, = random.sample(shared.knownNodes[
|
|
self.streamNumber * 2], 1)
|
|
if isHostInPrivateIPRange(peer.host):
|
|
continue
|
|
addrsInChildStreamLeft[peer] = shared.knownNodes[
|
|
self.streamNumber * 2][peer]
|
|
if len(shared.knownNodes[(self.streamNumber * 2) + 1]) > 0:
|
|
for i in range(250):
|
|
peer, = random.sample(shared.knownNodes[
|
|
(self.streamNumber * 2) + 1], 1)
|
|
if isHostInPrivateIPRange(peer.host):
|
|
continue
|
|
addrsInChildStreamRight[peer] = shared.knownNodes[
|
|
(self.streamNumber * 2) + 1][peer]
|
|
numberOfAddressesInAddrMessage = 0
|
|
payload = ''
|
|
# print 'addrsInMyStream.items()', addrsInMyStream.items()
|
|
for (HOST, PORT), value in addrsInMyStream.items():
|
|
timeLastReceivedMessageFromThisNode = value
|
|
if timeLastReceivedMessageFromThisNode > (int(time.time()) - shared.maximumAgeOfNodesThatIAdvertiseToOthers): # If it is younger than 3 hours old..
|
|
numberOfAddressesInAddrMessage += 1
|
|
payload += pack(
|
|
'>Q', timeLastReceivedMessageFromThisNode) # 64-bit time
|
|
payload += pack('>I', self.streamNumber)
|
|
payload += pack(
|
|
'>q', 1) # service bit flags offered by this node
|
|
payload += shared.encodeHost(HOST)
|
|
payload += pack('>H', PORT) # remote port
|
|
for (HOST, PORT), value in addrsInChildStreamLeft.items():
|
|
timeLastReceivedMessageFromThisNode = value
|
|
if timeLastReceivedMessageFromThisNode > (int(time.time()) - shared.maximumAgeOfNodesThatIAdvertiseToOthers): # If it is younger than 3 hours old..
|
|
numberOfAddressesInAddrMessage += 1
|
|
payload += pack(
|
|
'>Q', timeLastReceivedMessageFromThisNode) # 64-bit time
|
|
payload += pack('>I', self.streamNumber * 2)
|
|
payload += pack(
|
|
'>q', 1) # service bit flags offered by this node
|
|
payload += shared.encodeHost(HOST)
|
|
payload += pack('>H', PORT) # remote port
|
|
for (HOST, PORT), value in addrsInChildStreamRight.items():
|
|
timeLastReceivedMessageFromThisNode = value
|
|
if timeLastReceivedMessageFromThisNode > (int(time.time()) - shared.maximumAgeOfNodesThatIAdvertiseToOthers): # If it is younger than 3 hours old..
|
|
numberOfAddressesInAddrMessage += 1
|
|
payload += pack(
|
|
'>Q', timeLastReceivedMessageFromThisNode) # 64-bit time
|
|
payload += pack('>I', (self.streamNumber * 2) + 1)
|
|
payload += pack(
|
|
'>q', 1) # service bit flags offered by this node
|
|
payload += shared.encodeHost(HOST)
|
|
payload += pack('>H', PORT) # remote port
|
|
|
|
payload = encodeVarint(numberOfAddressesInAddrMessage) + payload
|
|
self.sendDataThreadQueue.put((0, 'sendRawData', shared.CreatePacket('addr', payload)))
|
|
|
|
|
|
# We have received a version message
|
|
def recversion(self, data):
|
|
if len(data) < 83:
|
|
# This version message is unreasonably short. Forget it.
|
|
return
|
|
if self.verackSent:
|
|
"""
|
|
We must have already processed the remote node's version message.
|
|
There might be a time in the future when we Do want to process
|
|
a new version message, like if the remote node wants to update
|
|
the streams in which they are interested. But for now we'll
|
|
ignore this version message
|
|
"""
|
|
return
|
|
self.remoteProtocolVersion, = unpack('>L', data[:4])
|
|
self.services, = unpack('>q', data[4:12])
|
|
if self.remoteProtocolVersion < 3:
|
|
self.sendDataThreadQueue.put((0, 'shutdown','no data'))
|
|
logger.debug ('Closing connection to old protocol version ' + str(self.remoteProtocolVersion) + ' node: ' + str(self.peer))
|
|
return
|
|
timestamp, = unpack('>Q', data[12:20])
|
|
timeOffset = timestamp - int(time.time())
|
|
if timeOffset > 3600:
|
|
self.sendDataThreadQueue.put((0, 'sendRawData', shared.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, timeOffset))
|
|
time.sleep(2)
|
|
self.sendDataThreadQueue.put((0, 'shutdown','no data'))
|
|
return
|
|
if timeOffset < -3600:
|
|
self.sendDataThreadQueue.put((0, 'sendRawData', shared.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, timeOffset))
|
|
time.sleep(2)
|
|
self.sendDataThreadQueue.put((0, 'shutdown','no data'))
|
|
return
|
|
self.myExternalIP = socket.inet_ntoa(data[40:44])
|
|
# print 'myExternalIP', self.myExternalIP
|
|
self.remoteNodeIncomingPort, = unpack('>H', data[70:72])
|
|
# print 'remoteNodeIncomingPort', self.remoteNodeIncomingPort
|
|
useragentLength, lengthOfUseragentVarint = decodeVarint(
|
|
data[80:84])
|
|
readPosition = 80 + lengthOfUseragentVarint
|
|
useragent = data[readPosition:readPosition + useragentLength]
|
|
|
|
# version check
|
|
userAgentName, userAgentVersion = useragent[1:-1].split(":")
|
|
if userAgentName == "PyBitmessage":
|
|
myVersion = [int(n) for n in shared.softwareVersion.split(".")]
|
|
remoteVersion = [int(n) for n in userAgentVersion.split(".")]
|
|
# remote is newer, but do not cross between stable and unstable
|
|
if cmp(remoteVersion, myVersion) > 0 and \
|
|
(myVersion[1] % 2 == remoteVersion[1] % 2):
|
|
shared.UISignalQueue.put(('newVersionAvailable', remoteVersion))
|
|
|
|
readPosition += useragentLength
|
|
numberOfStreamsInVersionMessage, lengthOfNumberOfStreamsInVersionMessage = decodeVarint(
|
|
data[readPosition:])
|
|
readPosition += lengthOfNumberOfStreamsInVersionMessage
|
|
self.streamNumber, lengthOfRemoteStreamNumber = decodeVarint(
|
|
data[readPosition:])
|
|
logger.debug('Remote node useragent: ' + useragent + ' stream number:' + str(self.streamNumber) + ' time offset: ' + str(timeOffset) + ' seconds.')
|
|
|
|
if self.streamNumber != 1:
|
|
self.sendDataThreadQueue.put((0, 'shutdown','no data'))
|
|
logger.debug ('Closed connection to ' + str(self.peer) + ' because they are interested in stream ' + str(self.streamNumber) + '.')
|
|
return
|
|
shared.connectedHostsList[
|
|
self.peer.host] = 1 # We use this data structure to not only keep track of what hosts we are connected to so that we don't try to connect to them again, but also to list the connections count on the Network Status tab.
|
|
# If this was an incoming connection, then the sendDataThread
|
|
# doesn't know the stream. We have to set it.
|
|
if not self.initiatedConnection:
|
|
self.sendDataThreadQueue.put((0, 'setStreamNumber', self.streamNumber))
|
|
if data[72:80] == shared.eightBytesOfRandomDataUsedToDetectConnectionsToSelf:
|
|
self.sendDataThreadQueue.put((0, 'shutdown','no data'))
|
|
logger.debug('Closing connection to myself: ' + str(self.peer))
|
|
return
|
|
|
|
# The other peer's protocol version is of interest to the sendDataThread but we learn of it
|
|
# in this version message. Let us inform the sendDataThread.
|
|
self.sendDataThreadQueue.put((0, 'setRemoteProtocolVersion', self.remoteProtocolVersion))
|
|
|
|
with shared.knownNodesLock:
|
|
shared.knownNodes[self.streamNumber][shared.Peer(self.peer.host, self.remoteNodeIncomingPort)] = int(time.time())
|
|
shared.needToWriteKnownNodesToDisk = True
|
|
|
|
self.sendverack()
|
|
if self.initiatedConnection == False:
|
|
self.sendversion()
|
|
|
|
# Sends a version message
|
|
def sendversion(self):
|
|
logger.debug('Sending version message')
|
|
self.sendDataThreadQueue.put((0, 'sendRawData', shared.assembleVersionMessage(
|
|
self.peer.host, self.peer.port, self.streamNumber, not self.initiatedConnection)))
|
|
|
|
|
|
# Sends a verack message
|
|
def sendverack(self):
|
|
logger.debug('Sending verack')
|
|
self.sendDataThreadQueue.put((0, 'sendRawData', shared.CreatePacket('verack')))
|
|
self.verackSent = True
|
|
if self.verackReceived:
|
|
self.connectionFullyEstablished()
|