833 lines
44 KiB
Python
833 lines
44 KiB
Python
doTimingAttackMitigation = False
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import base64
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import datetime
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import errno
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import math
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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 Queue
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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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from binascii import hexlify
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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 configparser import BMConfigParser
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from class_objectHashHolder import objectHashHolder
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from helper_generic import addDataPadding, isHostInPrivateIPRange
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from helper_sql import sqlQuery
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import knownnodes
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from debug import logger
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import paths
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import protocol
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from inventory import Inventory, PendingDownload, PendingUpload
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import queues
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import state
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import throttle
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import tr
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from version import softwareVersion
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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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objectHashHolderInstance):
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self.sock = sock
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self.peer = state.Peer(HOST, port)
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self.name = "receiveData-" + self.peer.host.replace(":", ".") # ":" log parser field separator
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self.streamNumber = state.streamsInWhichIAmParticipating
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self.remoteStreams = []
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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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self.hostIdent = self.peer.port if ".onion" in BMConfigParser().get('bitmessagesettings', 'onionhostname') and protocol.checkSocksIP(self.peer.host) else self.peer.host
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shared.connectedHostsList[
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self.hostIdent] = 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 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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self.objectHashHolderInstance = objectHashHolderInstance
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self.startTime = time.time()
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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 state.shutdown == 0:
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dataLen = len(self.data)
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try:
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isSSL = False
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if ((self.services & protocol.NODE_SSL == protocol.NODE_SSL) and
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self.connectionIsOrWasFullyEstablished and
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protocol.haveSSL(not self.initiatedConnection)):
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isSSL = True
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dataRecv = self.sslSock.recv(throttle.ReceiveThrottle().chunkSize)
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else:
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dataRecv = self.sock.recv(throttle.ReceiveThrottle().chunkSize)
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self.data += dataRecv
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throttle.ReceiveThrottle().wait(len(dataRecv))
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except socket.timeout:
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if self.connectionIsOrWasFullyEstablished:
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self.sendping("Still around!")
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continue
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logger.error("Timeout during protocol initialisation")
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break
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except ssl.SSLError as err:
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if err.errno == ssl.SSL_ERROR_WANT_READ:
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select.select([self.sslSock], [], [], 10)
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logger.debug('sock.recv retriable SSL error')
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continue
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if err.errno is None and 'timed out' in str(err):
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if self.connectionIsOrWasFullyEstablished:
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self.sendping("Still around!")
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continue
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logger.error ('SSL error: %i/%s', err.errno if err.errno else 0, str(err))
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break
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except socket.error as err:
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if err.errno in (errno.EAGAIN, errno.EWOULDBLOCK):
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select.select([self.sslSock if isSSL else self.sock], [], [], 10)
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logger.debug('sock.recv retriable error')
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continue
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if sys.platform.startswith('win') and err.errno in (errno.WSAEAGAIN, errno.WSAEWOULDBLOCK):
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select.select([self.sslSock if isSSL else self.sock], [], [], 10)
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logger.debug('sock.recv retriable error')
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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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for stream in self.remoteStreams:
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try:
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del self.selfInitiatedConnections[stream][self]
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except KeyError:
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pass
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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.hostIdent]
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except Exception as err:
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logger.error('Could not delete ' + str(self.hostIdent) + ' from shared.connectedHostsList.' + str(err))
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PendingDownload().threadEnd()
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queues.UISignalQueue.put(('updateNetworkStatusTab', 'no data'))
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self.checkTimeOffsetNotification()
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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 antiIntersectionDelay(self, initial = False):
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# estimated time for a small object to propagate across the whole network
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delay = math.ceil(math.log(max(len(knownnodes.knownNodes[x]) for x in knownnodes.knownNodes) + 2, 20)) * (0.2 + objectHashHolder.size/2)
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# take the stream with maximum amount of nodes
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# +2 is to avoid problems with log(0) and log(1)
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# 20 is avg connected nodes count
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# 0.2 is avg message transmission time
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now = time.time()
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if initial and now - delay < self.startTime:
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logger.debug("Initial sleeping for %.2fs", delay - (now - self.startTime))
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time.sleep(delay - (now - self.startTime))
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elif not initial:
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logger.debug("Sleeping due to missing object for %.2fs", delay)
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time.sleep(delay)
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def checkTimeOffsetNotification(self):
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if shared.timeOffsetWrongCount >= 4 and not self.connectionIsOrWasFullyEstablished:
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queues.UISignalQueue.put(('updateStatusBar', tr._translate("MainWindow", "The time on your computer, %1, may be wrong. Please verify your settings.").arg(datetime.datetime.now().strftime("%H:%M:%S"))))
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def processData(self):
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if len(self.data) < protocol.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 = protocol.Header.unpack(self.data[:protocol.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 + protocol.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 + protocol.Header.size: # check if the whole message has arrived yet.
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return
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payload = self.data[protocol.Header.size:payloadLength + protocol.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 + protocol.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 knownnodes.knownNodesLock:
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for stream in self.streamNumber:
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knownnodes.knownNodes[stream][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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else:
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logger.info("Unknown command %s, ignoring", command)
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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 + protocol.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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try:
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self.sendgetdata(PendingDownload().pull(100))
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except Queue.Full:
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pass
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self.processData()
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def sendpong(self, payload):
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logger.debug('Sending pong')
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self.sendDataThreadQueue.put((0, 'sendRawData', protocol.CreatePacket('pong', payload)))
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def sendping(self, payload):
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logger.debug('Sending ping')
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self.sendDataThreadQueue.put((0, 'sendRawData', protocol.CreatePacket('ping', payload)))
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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 sslHandshake(self):
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self.sslSock = self.sock
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if ((self.services & protocol.NODE_SSL == protocol.NODE_SSL) and
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protocol.haveSSL(not self.initiatedConnection)):
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logger.debug("Initialising TLS")
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if sys.version_info >= (2,7,9):
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context = ssl.SSLContext(protocol.sslProtocolVersion)
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context.set_ciphers(protocol.sslProtocolCiphers)
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context.set_ecdh_curve("secp256k1")
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context.check_hostname = False
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context.verify_mode = ssl.CERT_NONE
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# also exclude TLSv1 and TLSv1.1 in the future
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context.options = ssl.OP_ALL | ssl.OP_NO_SSLv2 | ssl.OP_NO_SSLv3 | ssl.OP_SINGLE_ECDH_USE | ssl.OP_CIPHER_SERVER_PREFERENCE
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self.sslSock = context.wrap_socket(self.sock, server_side = not self.initiatedConnection, do_handshake_on_connect=False)
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else:
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self.sslSock = ssl.wrap_socket(self.sock, keyfile = os.path.join(paths.codePath(), 'sslkeys', 'key.pem'), certfile = os.path.join(paths.codePath(), 'sslkeys', 'cert.pem'), server_side = not self.initiatedConnection, ssl_version=protocol.sslProtocolVersion, do_handshake_on_connect=False, ciphers=protocol.sslProtocolCiphers)
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self.sendDataThreadQueue.join()
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while True:
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try:
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self.sslSock.do_handshake()
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logger.debug("TLS handshake success")
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break
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except ssl.SSLError as e:
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if sys.hexversion >= 0x02070900:
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if isinstance (e, ssl.SSLWantReadError):
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logger.debug("Waiting for SSL socket handhake read")
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select.select([self.sslSock], [], [], 10)
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continue
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elif isinstance (e, ssl.SSLWantWriteError):
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logger.debug("Waiting for SSL socket handhake write")
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select.select([], [self.sslSock], [], 10)
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continue
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else:
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if e.args[0] == ssl.SSL_ERROR_WANT_READ:
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logger.debug("Waiting for SSL socket handhake read")
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select.select([self.sslSock], [], [], 10)
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continue
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elif e.args[0] == ssl.SSL_ERROR_WANT_WRITE:
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logger.debug("Waiting for SSL socket handhake write")
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select.select([], [self.sslSock], [], 10)
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continue
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logger.error("SSL socket handhake failed: %s, shutting down connection", str(e))
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self.sendDataThreadQueue.put((0, 'shutdown','tls handshake fail %s' % (str(e))))
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return
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except Exception:
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logger.error("SSL socket handhake failed, shutting down connection", exc_info=True)
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self.sendDataThreadQueue.put((0, 'shutdown','tls handshake fail'))
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return
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# SSL in the background should be blocking, otherwise the error handling is difficult
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self.sslSock.settimeout(None)
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def peerValidityChecks(self):
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if self.remoteProtocolVersion < 3:
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self.sendDataThreadQueue.put((0, 'sendRawData',protocol.assembleErrorMessage(
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fatal=2, errorText="Your is using an old protocol. Closing connection.")))
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logger.debug ('Closing connection to old protocol version ' + str(self.remoteProtocolVersion) + ' node: ' + str(self.peer))
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return False
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if self.timeOffset > 3600:
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self.sendDataThreadQueue.put((0, 'sendRawData', protocol.assembleErrorMessage(
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fatal=2, errorText="Your time is too far in the future compared to mine. Closing connection.")))
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logger.info("%s's time is too far in the future (%s seconds). Closing connection to it.", self.peer, self.timeOffset)
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shared.timeOffsetWrongCount += 1
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time.sleep(2)
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return False
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elif self.timeOffset < -3600:
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self.sendDataThreadQueue.put((0, 'sendRawData', protocol.assembleErrorMessage(
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fatal=2, errorText="Your time is too far in the past compared to mine. Closing connection.")))
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logger.info("%s's time is too far in the past (timeOffset %s seconds). Closing connection to it.", self.peer, self.timeOffset)
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shared.timeOffsetWrongCount += 1
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return False
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else:
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shared.timeOffsetWrongCount = 0
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if len(self.streamNumber) == 0:
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self.sendDataThreadQueue.put((0, 'sendRawData', protocol.assembleErrorMessage(
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fatal=2, errorText="We don't have shared stream interests. Closing connection.")))
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logger.debug ('Closed connection to ' + str(self.peer) + ' because there is no overlapping interest in streams.')
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return False
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return True
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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.sslHandshake()
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if self.peerValidityChecks() == False:
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time.sleep(2)
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self.sendDataThreadQueue.put((0, 'shutdown','no data'))
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self.checkTimeOffsetNotification()
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return
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self.connectionIsOrWasFullyEstablished = True
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shared.timeOffsetWrongCount = 0
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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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queues.UISignalQueue.put(('setStatusIcon', 'green'))
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self.sock.settimeout(
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600) # We'll send out a ping every 5 minutes to make sure the connection stays alive if there has been no other traffic to send lately.
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queues.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(state.sendDataQueues)) + "\n" + \
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'broadcasting addr from within connectionFullyEstablished function.')
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if self.initiatedConnection:
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state.networkProtocolAvailability[protocol.networkType(self.peer.host)] = True
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# we need to send our own objects to this node
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PendingUpload().add()
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# Let all of our peers know about this new node.
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for stream in self.remoteStreams:
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dataToSend = (int(time.time()), stream, self.services, self.peer.host, self.remoteNodeIncomingPort)
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protocol.broadcastToSendDataQueues((
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stream, '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, 'sendRawData', protocol.assembleErrorMessage(fatal=2, errorText="Server full, please try again later.")))
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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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bigInvList = {}
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for stream in self.streamNumber:
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for hash in Inventory().unexpired_hashes_by_stream(stream):
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if hash not in self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware and not self.objectHashHolderInstance.hasHash(hash):
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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', protocol.CreatePacket('inv', payload)))
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def _sleepForTimingAttackMitigation(self, sleepTime):
|
|
# We don't need to do the timing attack mitigation if we are
|
|
# only connected to the trusted peer because we can trust the
|
|
# peer not to attack
|
|
if sleepTime > 0 and doTimingAttackMitigation and state.trustedPeer == None:
|
|
logger.debug('Timing attack mitigation: Sleeping for ' + str(sleepTime) + ' seconds.')
|
|
time.sleep(sleepTime)
|
|
|
|
def recerror(self, data):
|
|
"""
|
|
The remote node has been polite enough to send you an error message.
|
|
"""
|
|
fatalStatus, readPosition = decodeVarint(data[:10])
|
|
banTime, banTimeLength = decodeVarint(data[readPosition:readPosition+10])
|
|
readPosition += banTimeLength
|
|
inventoryVectorLength, inventoryVectorLengthLength = decodeVarint(data[readPosition:readPosition+10])
|
|
if inventoryVectorLength > 100:
|
|
return
|
|
readPosition += inventoryVectorLengthLength
|
|
inventoryVector = data[readPosition:readPosition+inventoryVectorLength]
|
|
readPosition += inventoryVectorLength
|
|
errorTextLength, errorTextLengthLength = decodeVarint(data[readPosition:readPosition+10])
|
|
if errorTextLength > 1000:
|
|
return
|
|
readPosition += errorTextLengthLength
|
|
errorText = data[readPosition:readPosition+errorTextLength]
|
|
if fatalStatus == 0:
|
|
fatalHumanFriendly = 'Warning'
|
|
elif fatalStatus == 1:
|
|
fatalHumanFriendly = 'Error'
|
|
elif fatalStatus == 2:
|
|
fatalHumanFriendly = 'Fatal'
|
|
message = '%s message received from %s: %s.' % (fatalHumanFriendly, self.peer, errorText)
|
|
if inventoryVector:
|
|
message += " This concerns object %s" % hexlify(inventoryVector)
|
|
if banTime > 0:
|
|
message += " Remote node says that the ban time is %s" % banTime
|
|
logger.error(message)
|
|
|
|
|
|
def recobject(self, data):
|
|
self.messageProcessingStartTime = time.time()
|
|
lengthOfTimeWeShouldUseToProcessThisMessage = shared.checkAndShareObjectWithPeers(data)
|
|
|
|
"""
|
|
Sleeping will help guarantee that we can process messages faster than a
|
|
remote node can send them. If we fall behind, the attacker could observe
|
|
that we are are slowing down the rate at which we request objects from the
|
|
network which would indicate that we own a particular address (whichever
|
|
one to which they are sending all of their attack messages). Note
|
|
that if an attacker connects to a target with many connections, this
|
|
mitigation mechanism might not be sufficient.
|
|
"""
|
|
sleepTime = lengthOfTimeWeShouldUseToProcessThisMessage - (time.time() - self.messageProcessingStartTime)
|
|
self._sleepForTimingAttackMitigation(sleepTime)
|
|
|
|
|
|
# We have received an inv message
|
|
def recinv(self, data):
|
|
numberOfItemsInInv, lengthOfVarint = decodeVarint(data[:10])
|
|
if numberOfItemsInInv > 50000:
|
|
sys.stderr.write('Too many items in inv message!')
|
|
return
|
|
if len(data) < lengthOfVarint + (numberOfItemsInInv * 32):
|
|
logger.info('inv message doesn\'t contain enough data. Ignoring.')
|
|
return
|
|
|
|
startTime = time.time()
|
|
advertisedSet = set()
|
|
for i in range(numberOfItemsInInv):
|
|
advertisedSet.add(data[lengthOfVarint + (32 * i):32 + lengthOfVarint + (32 * i)])
|
|
objectsNewToMe = advertisedSet
|
|
for stream in self.streamNumber:
|
|
objectsNewToMe -= Inventory().hashes_by_stream(stream)
|
|
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:
|
|
PendingDownload().add(item)
|
|
self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware[item] = 0 # helps us keep from sending inv messages to peers that already know about the objects listed therein
|
|
|
|
# Send a getdata message to our peer to request the object with the given
|
|
# hash
|
|
def sendgetdata(self, hashes):
|
|
if len(hashes) == 0:
|
|
return
|
|
logger.debug('sending getdata to retrieve %i objects', len(hashes))
|
|
payload = encodeVarint(len(hashes)) + ''.join(hashes)
|
|
self.sendDataThreadQueue.put((0, 'sendRawData', protocol.CreatePacket('getdata', payload)), False)
|
|
|
|
|
|
# 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
|
|
self.antiIntersectionDelay(True) # only handle getdata requests if we have been connected long enough
|
|
for i in xrange(numberOfRequestedInventoryItems):
|
|
hash = data[lengthOfVarint + (
|
|
i * 32):32 + lengthOfVarint + (i * 32)]
|
|
logger.debug('received getdata request for item:' + hexlify(hash))
|
|
|
|
if self.objectHashHolderInstance.hasHash(hash):
|
|
self.antiIntersectionDelay()
|
|
else:
|
|
if hash in Inventory():
|
|
self.sendObject(hash, Inventory()[hash].payload)
|
|
else:
|
|
self.antiIntersectionDelay()
|
|
logger.warning('%s asked for an object with a getdata which is not in either our memory inventory or our SQL inventory. We probably cleaned it out after advertising it but before they got around to asking for it.' % (self.peer,))
|
|
|
|
# Our peer has requested (in a getdata message) that we send an object.
|
|
def sendObject(self, hash, payload):
|
|
logger.debug('sending an object.')
|
|
self.sendDataThreadQueue.put((0, 'sendRawData', (hash, protocol.CreatePacket('object',payload))))
|
|
|
|
def _checkIPAddress(self, host):
|
|
if host[0:12] == '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF':
|
|
hostStandardFormat = socket.inet_ntop(socket.AF_INET, host[12:])
|
|
return self._checkIPv4Address(host[12:], hostStandardFormat)
|
|
elif host[0:6] == '\xfd\x87\xd8\x7e\xeb\x43':
|
|
# Onion, based on BMD/bitcoind
|
|
hostStandardFormat = base64.b32encode(host[6:]).lower() + ".onion"
|
|
return hostStandardFormat
|
|
else:
|
|
hostStandardFormat = socket.inet_ntop(socket.AF_INET6, host)
|
|
if hostStandardFormat == "":
|
|
# This can happen on Windows systems which are not 64-bit compatible
|
|
# so let us drop the IPv6 address.
|
|
return False
|
|
return self._checkIPv6Address(host, hostStandardFormat)
|
|
|
|
def _checkIPv4Address(self, host, hostStandardFormat):
|
|
if host[0] == '\x7F': # 127/8
|
|
logger.debug('Ignoring IP address in loopback range: ' + hostStandardFormat)
|
|
return False
|
|
if host[0] == '\x0A': # 10/8
|
|
logger.debug('Ignoring IP address in private range: ' + hostStandardFormat)
|
|
return False
|
|
if host[0:2] == '\xC0\xA8': # 192.168/16
|
|
logger.debug('Ignoring IP address in private range: ' + hostStandardFormat)
|
|
return False
|
|
if host[0:2] >= '\xAC\x10' and host[0:2] < '\xAC\x20': # 172.16/12
|
|
logger.debug('Ignoring IP address in private range:' + hostStandardFormat)
|
|
return False
|
|
return hostStandardFormat
|
|
|
|
def _checkIPv6Address(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 hostStandardFormat
|
|
|
|
# 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 not in self.streamNumber and (recaddrStream / 2) not in self.streamNumber: # if the embedded stream number and its parent are not in my 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)])
|
|
hostStandardFormat = self._checkIPAddress(fullHost)
|
|
if hostStandardFormat is False:
|
|
continue
|
|
if recaddrPort == 0:
|
|
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 knownnodes.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 knownnodes.knownNodesLock:
|
|
knownnodes.knownNodes[recaddrStream] = {}
|
|
peerFromAddrMessage = state.Peer(hostStandardFormat, recaddrPort)
|
|
if peerFromAddrMessage not in knownnodes.knownNodes[recaddrStream]:
|
|
if len(knownnodes.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 knownnodes.knownNodesLock:
|
|
knownnodes.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)
|
|
protocol.broadcastToSendDataQueues((
|
|
recaddrStream, 'advertisepeer', hostDetails))
|
|
else:
|
|
timeLastReceivedMessageFromThisNode = knownnodes.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 knownnodes.knownNodesLock:
|
|
knownnodes.knownNodes[recaddrStream][peerFromAddrMessage] = timeSomeoneElseReceivedMessageFromThisNode
|
|
|
|
for stream in self.streamNumber:
|
|
logger.debug('knownNodes currently has %i nodes for stream %i', len(knownnodes.knownNodes[stream]), 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):
|
|
# We are going to share a maximum number of 1000 addrs (per overlapping
|
|
# stream) with our peer. 500 from overlapping streams, 250 from the
|
|
# left child stream, and 250 from the right child stream.
|
|
for stream in self.streamNumber:
|
|
addrsInMyStream = {}
|
|
addrsInChildStreamLeft = {}
|
|
addrsInChildStreamRight = {}
|
|
|
|
with knownnodes.knownNodesLock:
|
|
if len(knownnodes.knownNodes[stream]) > 0:
|
|
ownPosition = random.randint(0, 499)
|
|
sentOwn = False
|
|
for i in range(500):
|
|
# if current connection is over a proxy, sent our own onion address at a random position
|
|
if ownPosition == i and ".onion" in BMConfigParser().get("bitmessagesettings", "onionhostname") and \
|
|
hasattr(self.sock, "getproxytype") and self.sock.getproxytype() != "none" and not sentOwn:
|
|
peer = state.Peer(BMConfigParser().get("bitmessagesettings", "onionhostname"), BMConfigParser().getint("bitmessagesettings", "onionport"))
|
|
else:
|
|
# still may contain own onion address, but we don't change it
|
|
peer, = random.sample(knownnodes.knownNodes[stream], 1)
|
|
if isHostInPrivateIPRange(peer.host):
|
|
continue
|
|
if peer.host == BMConfigParser().get("bitmessagesettings", "onionhostname") and peer.port == BMConfigParser().getint("bitmessagesettings", "onionport") :
|
|
sentOwn = True
|
|
addrsInMyStream[peer] = knownnodes.knownNodes[
|
|
stream][peer]
|
|
# sent 250 only if the remote isn't interested in it
|
|
if len(knownnodes.knownNodes[stream * 2]) > 0 and stream not in self.streamNumber:
|
|
for i in range(250):
|
|
peer, = random.sample(knownnodes.knownNodes[
|
|
stream * 2], 1)
|
|
if isHostInPrivateIPRange(peer.host):
|
|
continue
|
|
addrsInChildStreamLeft[peer] = knownnodes.knownNodes[
|
|
stream * 2][peer]
|
|
if len(knownnodes.knownNodes[(stream * 2) + 1]) > 0 and stream not in self.streamNumber:
|
|
for i in range(250):
|
|
peer, = random.sample(knownnodes.knownNodes[
|
|
(stream * 2) + 1], 1)
|
|
if isHostInPrivateIPRange(peer.host):
|
|
continue
|
|
addrsInChildStreamRight[peer] = knownnodes.knownNodes[
|
|
(stream * 2) + 1][peer]
|
|
numberOfAddressesInAddrMessage = 0
|
|
payload = ''
|
|
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', stream)
|
|
payload += pack(
|
|
'>q', 1) # service bit flags offered by this node
|
|
payload += protocol.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', stream * 2)
|
|
payload += pack(
|
|
'>q', 1) # service bit flags offered by this node
|
|
payload += protocol.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', (stream * 2) + 1)
|
|
payload += pack(
|
|
'>q', 1) # service bit flags offered by this node
|
|
payload += protocol.encodeHost(HOST)
|
|
payload += pack('>H', PORT) # remote port
|
|
|
|
payload = encodeVarint(numberOfAddressesInAddrMessage) + payload
|
|
self.sendDataThreadQueue.put((0, 'sendRawData', protocol.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])
|
|
|
|
timestamp, = unpack('>Q', data[12:20])
|
|
self.timeOffset = timestamp - int(time.time())
|
|
|
|
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
|
|
self.userAgent = data[readPosition:readPosition + useragentLength]
|
|
|
|
# version check
|
|
try:
|
|
userAgentName, userAgentVersion = self.userAgent[1:-1].split(":", 2)
|
|
except:
|
|
userAgentName = self.userAgent
|
|
userAgentVersion = "0.0.0"
|
|
if userAgentName == "PyBitmessage":
|
|
myVersion = [int(n) for n in softwareVersion.split(".")]
|
|
try:
|
|
remoteVersion = [int(n) for n in userAgentVersion.split(".")]
|
|
except:
|
|
remoteVersion = 0
|
|
# remote is newer, but do not cross between stable and unstable
|
|
try:
|
|
if cmp(remoteVersion, myVersion) > 0 and \
|
|
(myVersion[1] % 2 == remoteVersion[1] % 2):
|
|
queues.UISignalQueue.put(('newVersionAvailable', remoteVersion))
|
|
except:
|
|
pass
|
|
|
|
readPosition += useragentLength
|
|
numberOfStreamsInVersionMessage, lengthOfNumberOfStreamsInVersionMessage = decodeVarint(
|
|
data[readPosition:])
|
|
readPosition += lengthOfNumberOfStreamsInVersionMessage
|
|
self.remoteStreams = []
|
|
for i in range(numberOfStreamsInVersionMessage):
|
|
newStreamNumber, lengthOfRemoteStreamNumber = decodeVarint(data[readPosition:])
|
|
readPosition += lengthOfRemoteStreamNumber
|
|
self.remoteStreams.append(newStreamNumber)
|
|
logger.debug('Remote node useragent: %s, streams: (%s), time offset: %is.',
|
|
self.userAgent, ', '.join(str(x) for x in self.remoteStreams), self.timeOffset)
|
|
|
|
# find shared streams
|
|
self.streamNumber = sorted(set(state.streamsInWhichIAmParticipating).intersection(self.remoteStreams))
|
|
|
|
shared.connectedHostsList[
|
|
self.hostIdent] = 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.
|
|
self.sendDataThreadQueue.put((0, 'setStreamNumber', self.remoteStreams))
|
|
if data[72:80] == protocol.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))
|
|
|
|
if not isHostInPrivateIPRange(self.peer.host):
|
|
with knownnodes.knownNodesLock:
|
|
for stream in self.remoteStreams:
|
|
knownnodes.knownNodes[stream][state.Peer(self.peer.host, self.remoteNodeIncomingPort)] = int(time.time())
|
|
if not self.initiatedConnection:
|
|
knownnodes.knownNodes[stream][state.Peer(self.peer.host, self.remoteNodeIncomingPort)] -= 162000 # penalise inbound, 2 days minus 3 hours
|
|
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', protocol.assembleVersionMessage(
|
|
self.peer.host, self.peer.port, state.streamsInWhichIAmParticipating, not self.initiatedConnection)))
|
|
|
|
# Sends a verack message
|
|
def sendverack(self):
|
|
logger.debug('Sending verack')
|
|
self.sendDataThreadQueue.put((0, 'sendRawData', protocol.CreatePacket('verack')))
|
|
self.verackSent = True
|
|
if self.verackReceived:
|
|
self.connectionFullyEstablished()
|