837 lines
46 KiB
Python
837 lines
46 KiB
Python
doTimingAttackMitigation = True
|
|
|
|
import time
|
|
import threading
|
|
import shared
|
|
import hashlib
|
|
import socket
|
|
import random
|
|
from struct import unpack, pack
|
|
import sys
|
|
#import string
|
|
#from subprocess import call # used when the API must execute an outside program
|
|
#from pyelliptic.openssl import OpenSSL
|
|
|
|
#import highlevelcrypto
|
|
from addresses import *
|
|
import helper_generic
|
|
#import helper_bitcoin
|
|
#import helper_inbox
|
|
#import helper_sent
|
|
from helper_sql import *
|
|
#import tr
|
|
from debug import logger
|
|
#from bitmessagemain import shared.lengthOfTimeToLeaveObjectsInInventory, shared.lengthOfTimeToHoldOnToAllPubkeys, shared.maximumAgeOfAnObjectThatIAmWillingToAccept, shared.maximumAgeOfObjectsThatIAdvertiseToOthers, shared.maximumAgeOfNodesThatIAdvertiseToOthers, shared.numberOfObjectsThatWeHaveYetToGetPerPeer, shared.neededPubkeys
|
|
|
|
# This thread is created either by the synSenderThread(for outgoing
|
|
# connections) or the singleListenerThread(for incoming connections).
|
|
|
|
class receiveDataThread(threading.Thread):
|
|
|
|
def __init__(self):
|
|
threading.Thread.__init__(self)
|
|
self.data = ''
|
|
self.verackSent = False
|
|
self.verackReceived = False
|
|
|
|
def setup(
|
|
self,
|
|
sock,
|
|
HOST,
|
|
port,
|
|
streamNumber,
|
|
someObjectsOfWhichThisRemoteNodeIsAlreadyAware,
|
|
selfInitiatedConnections):
|
|
self.sock = sock
|
|
self.peer = shared.Peer(HOST, port)
|
|
self.streamNumber = streamNumber
|
|
self.payloadLength = 0 # This is the protocol payload length thus it doesn't include the 24 byte message header
|
|
self.objectsThatWeHaveYetToGetFromThisPeer = {}
|
|
self.selfInitiatedConnections = selfInitiatedConnections
|
|
shared.connectedHostsList[
|
|
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.
|
|
self.connectionIsOrWasFullyEstablished = False # set to true after the remote node and I accept each other's version messages. This is needed to allow the user interface to accurately reflect the current number of connections.
|
|
if self.streamNumber == -1: # This was an incoming connection. Send out a version message if we accept the other node's version message.
|
|
self.initiatedConnection = False
|
|
else:
|
|
self.initiatedConnection = True
|
|
self.selfInitiatedConnections[streamNumber][self] = 0
|
|
self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware = someObjectsOfWhichThisRemoteNodeIsAlreadyAware
|
|
|
|
def run(self):
|
|
with shared.printLock:
|
|
print 'ID of the receiveDataThread is', str(id(self)) + '. The size of the shared.connectedHostsList is now', len(shared.connectedHostsList)
|
|
|
|
while True:
|
|
dataLen = len(self.data)
|
|
try:
|
|
self.data += self.sock.recv(4096)
|
|
except socket.timeout:
|
|
with shared.printLock:
|
|
print 'Timeout occurred waiting for data from', self.peer, '. Closing receiveData thread. (ID:', str(id(self)) + ')'
|
|
break
|
|
except Exception as err:
|
|
with shared.printLock:
|
|
print 'sock.recv error. Closing receiveData thread (HOST:', self.peer, 'ID:', str(id(self)) + ').', err
|
|
break
|
|
# print 'Received', repr(self.data)
|
|
if len(self.data) == dataLen: # If self.sock.recv returned no data:
|
|
with shared.printLock:
|
|
print 'Connection to', self.peer, 'closed. Closing receiveData thread. (ID:', str(id(self)) + ')'
|
|
break
|
|
else:
|
|
self.processData()
|
|
|
|
try:
|
|
del self.selfInitiatedConnections[self.streamNumber][self]
|
|
with shared.printLock:
|
|
print 'removed self (a receiveDataThread) from selfInitiatedConnections'
|
|
except:
|
|
pass
|
|
shared.broadcastToSendDataQueues((0, 'shutdown', self.peer)) # commands the corresponding sendDataThread to shut itself down.
|
|
try:
|
|
del shared.connectedHostsList[self.peer.host]
|
|
except Exception as err:
|
|
with shared.printLock:
|
|
print 'Could not delete', self.peer.host, 'from shared.connectedHostsList.', err
|
|
|
|
try:
|
|
del shared.numberOfObjectsThatWeHaveYetToGetPerPeer[
|
|
self.peer]
|
|
except:
|
|
pass
|
|
shared.UISignalQueue.put(('updateNetworkStatusTab', 'no data'))
|
|
with shared.printLock:
|
|
print 'The size of the connectedHostsList is now:', len(shared.connectedHostsList)
|
|
|
|
|
|
def processData(self):
|
|
# if shared.verbose >= 3:
|
|
# with shared.printLock:
|
|
# print 'self.data is currently ', repr(self.data)
|
|
#
|
|
if len(self.data) < 24: # if so little of the data has arrived that we can't even read the checksum then wait for more data.
|
|
return
|
|
if self.data[0:4] != '\xe9\xbe\xb4\xd9':
|
|
if shared.verbose >= 1:
|
|
with shared.printLock:
|
|
print 'The magic bytes were not correct. First 40 bytes of data: ' + repr(self.data[0:40])
|
|
|
|
self.data = ""
|
|
return
|
|
self.payloadLength, = unpack('>L', self.data[16:20])
|
|
if len(self.data) < self.payloadLength + 24: # check if the whole message has arrived yet.
|
|
return
|
|
if self.data[20:24] != hashlib.sha512(self.data[24:self.payloadLength + 24]).digest()[0:4]: # test the checksum in the message. If it is correct...
|
|
print 'Checksum incorrect. Clearing this message.'
|
|
self.data = self.data[self.payloadLength + 24:]
|
|
self.processData()
|
|
return
|
|
# The time we've last seen this node is obviously right now since we
|
|
# just received valid data from it. So update the knownNodes list so
|
|
# that other peers can be made aware of its existance.
|
|
if self.initiatedConnection and self.connectionIsOrWasFullyEstablished: # The remote port is only something we should share with others if it is the remote node's incoming port (rather than some random operating-system-assigned outgoing port).
|
|
shared.knownNodesLock.acquire()
|
|
shared.knownNodes[self.streamNumber][self.peer] = int(time.time())
|
|
shared.knownNodesLock.release()
|
|
if self.payloadLength <= 180000000: # If the size of the message is greater than 180MB, ignore it. (I get memory errors when processing messages much larger than this though it is concievable that this value will have to be lowered if some systems are less tolarant of large messages.)
|
|
remoteCommand = self.data[4:16]
|
|
with shared.printLock:
|
|
print 'remoteCommand', repr(remoteCommand.replace('\x00', '')), ' from', self.peer
|
|
|
|
if remoteCommand == 'version\x00\x00\x00\x00\x00':
|
|
self.recversion(self.data[24:self.payloadLength + 24])
|
|
elif remoteCommand == 'verack\x00\x00\x00\x00\x00\x00':
|
|
self.recverack()
|
|
elif remoteCommand == 'addr\x00\x00\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished:
|
|
self.recaddr(self.data[24:self.payloadLength + 24])
|
|
elif remoteCommand == 'getpubkey\x00\x00\x00' and self.connectionIsOrWasFullyEstablished:
|
|
shared.checkAndSharegetpubkeyWithPeers(self.data[24:self.payloadLength + 24])
|
|
elif remoteCommand == 'pubkey\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished:
|
|
self.recpubkey(self.data[24:self.payloadLength + 24])
|
|
elif remoteCommand == 'inv\x00\x00\x00\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished:
|
|
self.recinv(self.data[24:self.payloadLength + 24])
|
|
elif remoteCommand == 'getdata\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished:
|
|
self.recgetdata(self.data[24:self.payloadLength + 24])
|
|
elif remoteCommand == 'msg\x00\x00\x00\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished:
|
|
self.recmsg(self.data[24:self.payloadLength + 24])
|
|
elif remoteCommand == 'broadcast\x00\x00\x00' and self.connectionIsOrWasFullyEstablished:
|
|
self.recbroadcast(self.data[24:self.payloadLength + 24])
|
|
elif remoteCommand == 'ping\x00\x00\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished:
|
|
self.sendpong()
|
|
elif remoteCommand == 'pong\x00\x00\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished:
|
|
pass
|
|
elif remoteCommand == 'alert\x00\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished:
|
|
pass
|
|
|
|
self.data = self.data[
|
|
self.payloadLength + 24:] # take this message out and then process the next message
|
|
if self.data == '':
|
|
while len(self.objectsThatWeHaveYetToGetFromThisPeer) > 0:
|
|
shared.numberOfInventoryLookupsPerformed += 1
|
|
objectHash, = random.sample(
|
|
self.objectsThatWeHaveYetToGetFromThisPeer, 1)
|
|
if objectHash in shared.inventory:
|
|
with shared.printLock:
|
|
print 'Inventory (in memory) already has object listed in inv message.'
|
|
|
|
del self.objectsThatWeHaveYetToGetFromThisPeer[
|
|
objectHash]
|
|
elif shared.isInSqlInventory(objectHash):
|
|
if shared.verbose >= 3:
|
|
with shared.printLock:
|
|
print 'Inventory (SQL on disk) already has object listed in inv message.'
|
|
|
|
del self.objectsThatWeHaveYetToGetFromThisPeer[
|
|
objectHash]
|
|
else:
|
|
self.sendgetdata(objectHash)
|
|
del self.objectsThatWeHaveYetToGetFromThisPeer[
|
|
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.
|
|
if len(self.objectsThatWeHaveYetToGetFromThisPeer) == 0:
|
|
with shared.printLock:
|
|
print '(concerning', str(self.peer) + ')', 'number of objectsThatWeHaveYetToGetFromThisPeer is now', len(self.objectsThatWeHaveYetToGetFromThisPeer)
|
|
|
|
try:
|
|
del shared.numberOfObjectsThatWeHaveYetToGetPerPeer[
|
|
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.
|
|
except:
|
|
pass
|
|
break
|
|
if len(self.objectsThatWeHaveYetToGetFromThisPeer) == 0:
|
|
with shared.printLock:
|
|
print '(concerning', str(self.peer) + ')', 'number of objectsThatWeHaveYetToGetFromThisPeer is now', len(self.objectsThatWeHaveYetToGetFromThisPeer)
|
|
|
|
try:
|
|
del shared.numberOfObjectsThatWeHaveYetToGetPerPeer[
|
|
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.
|
|
except:
|
|
pass
|
|
if len(self.objectsThatWeHaveYetToGetFromThisPeer) > 0:
|
|
with shared.printLock:
|
|
print '(concerning', str(self.peer) + ')', 'number of objectsThatWeHaveYetToGetFromThisPeer is now', len(self.objectsThatWeHaveYetToGetFromThisPeer)
|
|
|
|
shared.numberOfObjectsThatWeHaveYetToGetPerPeer[self.peer] = len(
|
|
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.
|
|
self.processData()
|
|
|
|
|
|
def sendpong(self):
|
|
print 'Sending pong'
|
|
try:
|
|
self.sock.sendall(
|
|
'\xE9\xBE\xB4\xD9\x70\x6F\x6E\x67\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xcf\x83\xe1\x35')
|
|
except Exception as err:
|
|
# if not 'Bad file descriptor' in err:
|
|
with shared.printLock:
|
|
print 'sock.sendall error:', err
|
|
|
|
|
|
def recverack(self):
|
|
print 'verack received'
|
|
self.verackReceived = True
|
|
if self.verackSent:
|
|
# We have thus both sent and received a verack.
|
|
self.connectionFullyEstablished()
|
|
|
|
def connectionFullyEstablished(self):
|
|
self.connectionIsOrWasFullyEstablished = True
|
|
if not self.initiatedConnection:
|
|
shared.clientHasReceivedIncomingConnections = True
|
|
shared.UISignalQueue.put(('setStatusIcon', 'green'))
|
|
self.sock.settimeout(
|
|
600) # We'll send out a pong every 5 minutes to make sure the connection stays alive if there has been no other traffic to send lately.
|
|
shared.UISignalQueue.put(('updateNetworkStatusTab', 'no data'))
|
|
with shared.printLock:
|
|
print 'Connection fully established with', self.peer
|
|
print 'The size of the connectedHostsList is now', len(shared.connectedHostsList)
|
|
print 'The length of sendDataQueues is now:', len(shared.sendDataQueues)
|
|
print 'broadcasting addr from within connectionFullyEstablished function.'
|
|
|
|
# Let all of our peers know about this new node.
|
|
dataToSend = (int(time.time()), self.streamNumber, 1, self.peer.host, self.remoteNodeIncomingPort)
|
|
shared.broadcastToSendDataQueues((
|
|
self.streamNumber, 'advertisepeer', dataToSend))
|
|
|
|
self.sendaddr() # This is one large addr message to this one peer.
|
|
if not self.initiatedConnection and len(shared.connectedHostsList) > 200:
|
|
with shared.printLock:
|
|
print 'We are connected to too many people. Closing connection.'
|
|
|
|
shared.broadcastToSendDataQueues((0, 'shutdown', self.peer))
|
|
return
|
|
self.sendBigInv()
|
|
|
|
def sendBigInv(self):
|
|
# Select all hashes which are younger than two days old and in this
|
|
# stream.
|
|
queryreturn = sqlQuery(
|
|
'''SELECT hash FROM inventory WHERE ((receivedtime>? and objecttype<>'pubkey') or (receivedtime>? and objecttype='pubkey')) and streamnumber=?''',
|
|
int(time.time()) - shared.maximumAgeOfObjectsThatIAdvertiseToOthers,
|
|
int(time.time()) - shared.lengthOfTimeToHoldOnToAllPubkeys,
|
|
self.streamNumber)
|
|
bigInvList = {}
|
|
for row in queryreturn:
|
|
hash, = row
|
|
if hash not in self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware:
|
|
bigInvList[hash] = 0
|
|
# We also have messages in our inventory in memory (which is a python
|
|
# dictionary). Let's fetch those too.
|
|
with shared.inventoryLock:
|
|
for hash, storedValue in shared.inventory.items():
|
|
if hash not in self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware:
|
|
objectType, streamNumber, payload, receivedTime, tag = storedValue
|
|
if streamNumber == self.streamNumber and receivedTime > int(time.time()) - shared.maximumAgeOfObjectsThatIAdvertiseToOthers:
|
|
bigInvList[hash] = 0
|
|
numberOfObjectsInInvMessage = 0
|
|
payload = ''
|
|
# Now let us start appending all of these hashes together. They will be
|
|
# sent out in a big inv message to our new peer.
|
|
for hash, storedValue in bigInvList.items():
|
|
payload += hash
|
|
numberOfObjectsInInvMessage += 1
|
|
if numberOfObjectsInInvMessage >= 50000: # We can only send a max of 50000 items per inv message but we may have more objects to advertise. They must be split up into multiple inv messages.
|
|
self.sendinvMessageToJustThisOnePeer(
|
|
numberOfObjectsInInvMessage, payload)
|
|
payload = ''
|
|
numberOfObjectsInInvMessage = 0
|
|
if numberOfObjectsInInvMessage > 0:
|
|
self.sendinvMessageToJustThisOnePeer(
|
|
numberOfObjectsInInvMessage, payload)
|
|
|
|
# Self explanatory. Notice that there is also a broadcastinv function for
|
|
# broadcasting invs to everyone in our stream.
|
|
def sendinvMessageToJustThisOnePeer(self, numberOfObjects, payload):
|
|
payload = encodeVarint(numberOfObjects) + payload
|
|
headerData = '\xe9\xbe\xb4\xd9' # magic bits, slighly different from Bitcoin's magic bits.
|
|
headerData += 'inv\x00\x00\x00\x00\x00\x00\x00\x00\x00'
|
|
headerData += pack('>L', len(payload))
|
|
headerData += hashlib.sha512(payload).digest()[:4]
|
|
with shared.printLock:
|
|
print 'Sending huge inv message with', numberOfObjects, 'objects to just this one peer'
|
|
|
|
try:
|
|
self.sock.sendall(headerData + payload)
|
|
except Exception as err:
|
|
# if not 'Bad file descriptor' in err:
|
|
with shared.printLock:
|
|
print 'sock.sendall error:', err
|
|
|
|
|
|
# We have received a broadcast message
|
|
def recbroadcast(self, data):
|
|
self.messageProcessingStartTime = time.time()
|
|
|
|
shared.checkAndShareBroadcastWithPeers(data)
|
|
|
|
"""
|
|
Let us now set lengthOfTimeWeShouldUseToProcessThisMessage. 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.
|
|
"""
|
|
if len(data) > 100000000: # Size is greater than 100 megabytes
|
|
lengthOfTimeWeShouldUseToProcessThisMessage = 100 # seconds.
|
|
elif len(data) > 10000000: # Between 100 and 10 megabytes
|
|
lengthOfTimeWeShouldUseToProcessThisMessage = 20 # seconds.
|
|
elif len(data) > 1000000: # Between 10 and 1 megabyte
|
|
lengthOfTimeWeShouldUseToProcessThisMessage = 3 # seconds.
|
|
else: # Less than 1 megabyte
|
|
lengthOfTimeWeShouldUseToProcessThisMessage = .6 # seconds.
|
|
|
|
sleepTime = lengthOfTimeWeShouldUseToProcessThisMessage - \
|
|
(time.time() - self.messageProcessingStartTime)
|
|
if sleepTime > 0 and doTimingAttackMitigation:
|
|
with shared.printLock:
|
|
print 'Timing attack mitigation: Sleeping for', sleepTime, 'seconds.'
|
|
time.sleep(sleepTime)
|
|
|
|
# We have received a msg message.
|
|
def recmsg(self, data):
|
|
self.messageProcessingStartTime = time.time()
|
|
|
|
shared.checkAndShareMsgWithPeers(data)
|
|
|
|
"""
|
|
Let us now set lengthOfTimeWeShouldUseToProcessThisMessage. 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.
|
|
"""
|
|
if len(data) > 100000000: # Size is greater than 100 megabytes
|
|
lengthOfTimeWeShouldUseToProcessThisMessage = 100 # seconds. Actual length of time it took my computer to decrypt and verify the signature of a 100 MB message: 3.7 seconds.
|
|
elif len(data) > 10000000: # Between 100 and 10 megabytes
|
|
lengthOfTimeWeShouldUseToProcessThisMessage = 20 # seconds. Actual length of time it took my computer to decrypt and verify the signature of a 10 MB message: 0.53 seconds. Actual length of time it takes in practice when processing a real message: 1.44 seconds.
|
|
elif len(data) > 1000000: # Between 10 and 1 megabyte
|
|
lengthOfTimeWeShouldUseToProcessThisMessage = 3 # seconds. Actual length of time it took my computer to decrypt and verify the signature of a 1 MB message: 0.18 seconds. Actual length of time it takes in practice when processing a real message: 0.30 seconds.
|
|
else: # Less than 1 megabyte
|
|
lengthOfTimeWeShouldUseToProcessThisMessage = .6 # seconds. Actual length of time it took my computer to decrypt and verify the signature of a 100 KB message: 0.15 seconds. Actual length of time it takes in practice when processing a real message: 0.25 seconds.
|
|
|
|
sleepTime = lengthOfTimeWeShouldUseToProcessThisMessage - \
|
|
(time.time() - self.messageProcessingStartTime)
|
|
if sleepTime > 0 and doTimingAttackMitigation:
|
|
with shared.printLock:
|
|
print 'Timing attack mitigation: Sleeping for', sleepTime, 'seconds.'
|
|
time.sleep(sleepTime)
|
|
|
|
# We have received a pubkey
|
|
def recpubkey(self, data):
|
|
self.pubkeyProcessingStartTime = time.time()
|
|
|
|
shared.checkAndSharePubkeyWithPeers(data)
|
|
|
|
lengthOfTimeWeShouldUseToProcessThisMessage = .1
|
|
sleepTime = lengthOfTimeWeShouldUseToProcessThisMessage - \
|
|
(time.time() - self.pubkeyProcessingStartTime)
|
|
if sleepTime > 0 and doTimingAttackMitigation:
|
|
with shared.printLock:
|
|
print 'Timing attack mitigation: Sleeping for', sleepTime, 'seconds.'
|
|
time.sleep(sleepTime)
|
|
|
|
|
|
# We have received an inv message
|
|
def recinv(self, data):
|
|
totalNumberOfobjectsThatWeHaveYetToGetFromAllPeers = 0 # this counts duplicates seperately because they take up memory
|
|
if len(shared.numberOfObjectsThatWeHaveYetToGetPerPeer) > 0:
|
|
for key, value in shared.numberOfObjectsThatWeHaveYetToGetPerPeer.items():
|
|
totalNumberOfobjectsThatWeHaveYetToGetFromAllPeers += value
|
|
with shared.printLock:
|
|
print 'number of keys(hosts) in shared.numberOfObjectsThatWeHaveYetToGetPerPeer:', len(shared.numberOfObjectsThatWeHaveYetToGetPerPeer)
|
|
print 'totalNumberOfobjectsThatWeHaveYetToGetFromAllPeers = ', totalNumberOfobjectsThatWeHaveYetToGetFromAllPeers
|
|
|
|
numberOfItemsInInv, lengthOfVarint = decodeVarint(data[:10])
|
|
if numberOfItemsInInv > 50000:
|
|
sys.stderr.write('Too many items in inv message!')
|
|
return
|
|
if len(data) < lengthOfVarint + (numberOfItemsInInv * 32):
|
|
print 'inv message doesn\'t contain enough data. Ignoring.'
|
|
return
|
|
if numberOfItemsInInv == 1: # we'll just request this data from the person who advertised the object.
|
|
if totalNumberOfobjectsThatWeHaveYetToGetFromAllPeers > 200000 and len(self.objectsThatWeHaveYetToGetFromThisPeer) > 1000: # inv flooding attack mitigation
|
|
with shared.printLock:
|
|
print 'We already have', 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:
|
|
with shared.printLock:
|
|
print 'Inventory (in memory) has inventory item already.'
|
|
elif shared.isInSqlInventory(data[lengthOfVarint:32 + lengthOfVarint]):
|
|
print '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: # inv flooding attack mitigation
|
|
with shared.printLock:
|
|
print 'We already have', totalNumberOfobjectsThatWeHaveYetToGetFromAllPeers, 'items yet to retrieve from peers and over', 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):
|
|
with shared.printLock:
|
|
print 'sending getdata to retrieve object with hash:', hash.encode('hex')
|
|
|
|
payload = '\x01' + hash
|
|
headerData = '\xe9\xbe\xb4\xd9' # magic bits, slighly different from Bitcoin's magic bits.
|
|
headerData += 'getdata\x00\x00\x00\x00\x00'
|
|
headerData += pack('>L', len(
|
|
payload)) # payload length. Note that we add an extra 8 for the nonce.
|
|
headerData += hashlib.sha512(payload).digest()[:4]
|
|
try:
|
|
self.sock.sendall(headerData + payload)
|
|
except Exception as err:
|
|
# if not 'Bad file descriptor' in err:
|
|
with shared.printLock:
|
|
print 'sock.sendall error:', err
|
|
|
|
|
|
# We have received a getdata request from our peer
|
|
def recgetdata(self, data):
|
|
numberOfRequestedInventoryItems, lengthOfVarint = decodeVarint(
|
|
data[:10])
|
|
if len(data) < lengthOfVarint + (32 * numberOfRequestedInventoryItems):
|
|
print 'getdata message does not contain enough data. Ignoring.'
|
|
return
|
|
for i in xrange(numberOfRequestedInventoryItems):
|
|
hash = data[lengthOfVarint + (
|
|
i * 32):32 + lengthOfVarint + (i * 32)]
|
|
with shared.printLock:
|
|
print 'received getdata request for item:', hash.encode('hex')
|
|
|
|
shared.numberOfInventoryLookupsPerformed += 1
|
|
shared.inventoryLock.acquire()
|
|
if hash in shared.inventory:
|
|
objectType, streamNumber, payload, receivedTime, tag = shared.inventory[
|
|
hash]
|
|
shared.inventoryLock.release()
|
|
self.sendData(objectType, payload)
|
|
else:
|
|
shared.inventoryLock.release()
|
|
queryreturn = sqlQuery(
|
|
'''select objecttype, payload from inventory where hash=?''',
|
|
hash)
|
|
if queryreturn != []:
|
|
for row in queryreturn:
|
|
objectType, payload = row
|
|
self.sendData(objectType, payload)
|
|
else:
|
|
print 'Someone asked for an object with a getdata which is not in either our memory inventory or our SQL inventory. That shouldn\'t have happened.'
|
|
|
|
# Our peer has requested (in a getdata message) that we send an object.
|
|
def sendData(self, objectType, payload):
|
|
headerData = '\xe9\xbe\xb4\xd9' # magic bits, slighly different from Bitcoin's magic bits.
|
|
if objectType == 'pubkey':
|
|
with shared.printLock:
|
|
print 'sending pubkey'
|
|
|
|
headerData += 'pubkey\x00\x00\x00\x00\x00\x00'
|
|
elif objectType == 'getpubkey' or objectType == 'pubkeyrequest':
|
|
with shared.printLock:
|
|
print 'sending getpubkey'
|
|
|
|
headerData += 'getpubkey\x00\x00\x00'
|
|
elif objectType == 'msg':
|
|
with shared.printLock:
|
|
print 'sending msg'
|
|
|
|
headerData += 'msg\x00\x00\x00\x00\x00\x00\x00\x00\x00'
|
|
elif objectType == 'broadcast':
|
|
with shared.printLock:
|
|
print 'sending broadcast'
|
|
|
|
headerData += 'broadcast\x00\x00\x00'
|
|
else:
|
|
sys.stderr.write(
|
|
'Error: sendData has been asked to send a strange objectType: %s\n' % str(objectType))
|
|
return
|
|
headerData += pack('>L', len(payload)) # payload length.
|
|
headerData += hashlib.sha512(payload).digest()[:4]
|
|
try:
|
|
self.sock.sendall(headerData + payload)
|
|
except Exception as err:
|
|
# if not 'Bad file descriptor' in err:
|
|
with shared.printLock:
|
|
print 'sock.sendall error:', err
|
|
|
|
|
|
# Advertise this object to all of our peers
|
|
"""def broadcastinv(self, hash):
|
|
with shared.printLock:
|
|
print 'broadcasting inv with hash:', hash.encode('hex')
|
|
|
|
shared.broadcastToSendDataQueues((self.streamNumber, 'advertiseobject', hash))
|
|
"""
|
|
# We have received an addr message.
|
|
def recaddr(self, data):
|
|
#listOfAddressDetailsToBroadcastToPeers = []
|
|
numberOfAddressesIncluded = 0
|
|
numberOfAddressesIncluded, lengthOfNumberOfAddresses = decodeVarint(
|
|
data[:10])
|
|
|
|
if shared.verbose >= 1:
|
|
with shared.printLock:
|
|
print 'addr message contains', numberOfAddressesIncluded, 'IP addresses.'
|
|
|
|
if numberOfAddressesIncluded > 1000 or numberOfAddressesIncluded == 0:
|
|
return
|
|
if len(data) != lengthOfNumberOfAddresses + (38 * numberOfAddressesIncluded):
|
|
print 'addr message does not contain the correct amount of data. Ignoring.'
|
|
return
|
|
|
|
for i in range(0, numberOfAddressesIncluded):
|
|
try:
|
|
if data[20 + lengthOfNumberOfAddresses + (38 * i):32 + lengthOfNumberOfAddresses + (38 * i)] != '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF':
|
|
with shared.printLock:
|
|
print 'Skipping IPv6 address.', repr(data[20 + lengthOfNumberOfAddresses + (38 * i):32 + lengthOfNumberOfAddresses + (38 * i)])
|
|
continue
|
|
except Exception as err:
|
|
with shared.printLock:
|
|
sys.stderr.write(
|
|
'ERROR TRYING TO UNPACK recaddr (to test for an IPv6 address). Message: %s\n' % str(err))
|
|
break # giving up on unpacking any more. We should still be connected however.
|
|
|
|
try:
|
|
recaddrStream, = unpack('>I', data[8 + lengthOfNumberOfAddresses + (
|
|
38 * i):12 + lengthOfNumberOfAddresses + (38 * i)])
|
|
except Exception as err:
|
|
with shared.printLock:
|
|
sys.stderr.write(
|
|
'ERROR TRYING TO UNPACK recaddr (recaddrStream). Message: %s\n' % str(err))
|
|
break # giving up on unpacking any more. We should still be connected however.
|
|
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
|
|
try:
|
|
recaddrServices, = unpack('>Q', data[12 + lengthOfNumberOfAddresses + (
|
|
38 * i):20 + lengthOfNumberOfAddresses + (38 * i)])
|
|
except Exception as err:
|
|
with shared.printLock:
|
|
sys.stderr.write(
|
|
'ERROR TRYING TO UNPACK recaddr (recaddrServices). Message: %s\n' % str(err))
|
|
break # giving up on unpacking any more. We should still be connected however.
|
|
|
|
try:
|
|
recaddrPort, = unpack('>H', data[36 + lengthOfNumberOfAddresses + (
|
|
38 * i):38 + lengthOfNumberOfAddresses + (38 * i)])
|
|
except Exception as err:
|
|
with shared.printLock:
|
|
sys.stderr.write(
|
|
'ERROR TRYING TO UNPACK recaddr (recaddrPort). Message: %s\n' % str(err))
|
|
break # giving up on unpacking any more. We should still be connected however.
|
|
# print 'Within recaddr(): IP', recaddrIP, ', Port',
|
|
# recaddrPort, ', i', i
|
|
hostFromAddrMessage = socket.inet_ntoa(data[
|
|
32 + lengthOfNumberOfAddresses + (38 * i):36 + lengthOfNumberOfAddresses + (38 * i)])
|
|
# print 'hostFromAddrMessage', hostFromAddrMessage
|
|
if data[32 + lengthOfNumberOfAddresses + (38 * i)] == '\x7F':
|
|
print 'Ignoring IP address in loopback range:', hostFromAddrMessage
|
|
continue
|
|
if data[32 + lengthOfNumberOfAddresses + (38 * i)] == '\x0A':
|
|
print 'Ignoring IP address in private range:', hostFromAddrMessage
|
|
continue
|
|
if data[32 + lengthOfNumberOfAddresses + (38 * i):34 + lengthOfNumberOfAddresses + (38 * i)] == '\xC0A8':
|
|
print 'Ignoring IP address in private range:', hostFromAddrMessage
|
|
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.
|
|
shared.knownNodesLock.acquire()
|
|
shared.knownNodes[recaddrStream] = {}
|
|
shared.knownNodesLock.release()
|
|
peerFromAddrMessage = shared.Peer(hostFromAddrMessage, 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.
|
|
shared.knownNodesLock.acquire()
|
|
shared.knownNodes[recaddrStream][peerFromAddrMessage] = (
|
|
timeSomeoneElseReceivedMessageFromThisNode)
|
|
shared.knownNodesLock.release()
|
|
with shared.printLock:
|
|
print 'added new node', peerFromAddrMessage, 'to knownNodes in stream', recaddrStream
|
|
|
|
shared.needToWriteKnownNodesToDisk = True
|
|
hostDetails = (
|
|
timeSomeoneElseReceivedMessageFromThisNode,
|
|
recaddrStream, recaddrServices, hostFromAddrMessage, recaddrPort)
|
|
#listOfAddressDetailsToBroadcastToPeers.append(hostDetails)
|
|
shared.broadcastToSendDataQueues((
|
|
self.streamNumber, 'advertisepeer', hostDetails))
|
|
else:
|
|
timeLastReceivedMessageFromThisNode = shared.knownNodes[recaddrStream][
|
|
peerFromAddrMessage] # PORT in this case is either the port we used to connect to the remote node, or the port that was specified by someone else in a past addr message.
|
|
if (timeLastReceivedMessageFromThisNode < timeSomeoneElseReceivedMessageFromThisNode) and (timeSomeoneElseReceivedMessageFromThisNode < int(time.time())):
|
|
shared.knownNodesLock.acquire()
|
|
shared.knownNodes[recaddrStream][peerFromAddrMessage] = timeSomeoneElseReceivedMessageFromThisNode
|
|
shared.knownNodesLock.release()
|
|
|
|
#if listOfAddressDetailsToBroadcastToPeers != []:
|
|
# self.broadcastaddr(listOfAddressDetailsToBroadcastToPeers)
|
|
with shared.printLock:
|
|
print 'knownNodes currently has', len(shared.knownNodes[self.streamNumber]), 'nodes for this stream.'
|
|
|
|
|
|
# Send a big addr message to our peer
|
|
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.
|
|
shared.knownNodesLock.acquire()
|
|
if len(shared.knownNodes[self.streamNumber]) > 0:
|
|
for i in range(500):
|
|
peer, = random.sample(shared.knownNodes[self.streamNumber], 1)
|
|
if helper_generic.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 helper_generic.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 helper_generic.isHostInPrivateIPRange(peer.host):
|
|
continue
|
|
addrsInChildStreamRight[peer] = shared.knownNodes[
|
|
(self.streamNumber * 2) + 1][peer]
|
|
shared.knownNodesLock.release()
|
|
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 += '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF' + \
|
|
socket.inet_aton(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 += '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF' + \
|
|
socket.inet_aton(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 += '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF' + \
|
|
socket.inet_aton(HOST)
|
|
payload += pack('>H', PORT) # remote port
|
|
|
|
payload = encodeVarint(numberOfAddressesInAddrMessage) + payload
|
|
datatosend = '\xE9\xBE\xB4\xD9addr\x00\x00\x00\x00\x00\x00\x00\x00'
|
|
datatosend = datatosend + pack('>L', len(payload)) # payload length
|
|
datatosend = datatosend + hashlib.sha512(payload).digest()[0:4]
|
|
datatosend = datatosend + payload
|
|
try:
|
|
self.sock.sendall(datatosend)
|
|
if shared.verbose >= 1:
|
|
with shared.printLock:
|
|
print 'Sending addr with', numberOfAddressesInAddrMessage, 'entries.'
|
|
|
|
except Exception as err:
|
|
# if not 'Bad file descriptor' in err:
|
|
with shared.printLock:
|
|
print 'sock.sendall error:', err
|
|
|
|
|
|
# We have received a version message
|
|
def recversion(self, data):
|
|
if len(data) < 83:
|
|
# This version message is unreasonably short. Forget it.
|
|
return
|
|
elif not self.verackSent:
|
|
self.remoteProtocolVersion, = unpack('>L', data[:4])
|
|
if self.remoteProtocolVersion <= 1:
|
|
shared.broadcastToSendDataQueues((0, 'shutdown', self.peer))
|
|
with shared.printLock:
|
|
print 'Closing connection to old protocol version 1 node: ', self.peer
|
|
return
|
|
# print 'remoteProtocolVersion', self.remoteProtocolVersion
|
|
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]
|
|
readPosition += useragentLength
|
|
numberOfStreamsInVersionMessage, lengthOfNumberOfStreamsInVersionMessage = decodeVarint(
|
|
data[readPosition:])
|
|
readPosition += lengthOfNumberOfStreamsInVersionMessage
|
|
self.streamNumber, lengthOfRemoteStreamNumber = decodeVarint(
|
|
data[readPosition:])
|
|
with shared.printLock:
|
|
print 'Remote node useragent:', useragent, ' stream number:', self.streamNumber
|
|
|
|
if self.streamNumber != 1:
|
|
shared.broadcastToSendDataQueues((0, 'shutdown', self.peer))
|
|
with shared.printLock:
|
|
print 'Closed connection to', self.peer, 'because they are interested in stream', 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 sendData thread
|
|
# doesn't know the stream. We have to set it.
|
|
if not self.initiatedConnection:
|
|
shared.broadcastToSendDataQueues((
|
|
0, 'setStreamNumber', (self.peer, self.streamNumber)))
|
|
if data[72:80] == shared.eightBytesOfRandomDataUsedToDetectConnectionsToSelf:
|
|
shared.broadcastToSendDataQueues((0, 'shutdown', self.peer))
|
|
with shared.printLock:
|
|
print 'Closing connection to myself: ', self.peer
|
|
return
|
|
shared.broadcastToSendDataQueues((0, 'setRemoteProtocolVersion', (
|
|
self.peer, self.remoteProtocolVersion)))
|
|
|
|
shared.knownNodesLock.acquire()
|
|
shared.knownNodes[self.streamNumber][shared.Peer(self.peer.host, self.remoteNodeIncomingPort)] = int(time.time())
|
|
shared.needToWriteKnownNodesToDisk = True
|
|
shared.knownNodesLock.release()
|
|
|
|
self.sendverack()
|
|
if self.initiatedConnection == False:
|
|
self.sendversion()
|
|
|
|
# Sends a version message
|
|
def sendversion(self):
|
|
with shared.printLock:
|
|
print 'Sending version message'
|
|
|
|
try:
|
|
self.sock.sendall(shared.assembleVersionMessage(
|
|
self.peer.host, self.peer.port, self.streamNumber))
|
|
except Exception as err:
|
|
# if not 'Bad file descriptor' in err:
|
|
with shared.printLock:
|
|
print 'sock.sendall error:', err
|
|
|
|
|
|
# Sends a verack message
|
|
def sendverack(self):
|
|
with shared.printLock:
|
|
print 'Sending verack'
|
|
try:
|
|
self.sock.sendall(
|
|
'\xE9\xBE\xB4\xD9\x76\x65\x72\x61\x63\x6B\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xcf\x83\xe1\x35')
|
|
except Exception as err:
|
|
# if not 'Bad file descriptor' in err:
|
|
with shared.printLock:
|
|
print 'sock.sendall error:', err
|
|
self.verackSent = True
|
|
if self.verackReceived:
|
|
self.connectionFullyEstablished()
|