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PyBitmessage
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Async network IO updates 

- WIP
This commit is contained in:
Peter Šurda 2017-04-04 10:46:01 +02:00
parent fe93473fc5
commit 51aeb284ca
Signed by untrusted user: PeterSurda
GPG Key ID: 0C5F50C0B5F37D87
2 changed files with 222 additions and 40 deletions
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192
src/bmproto.py
View File

@ -9,14 +9,19 @@ from network.socks5 import Socks5Connection, Socks5Resolver, Socks5AuthError, So
from network.socks4a import Socks4aConnection, Socks4aResolver, Socks4aError
import addresses
from bmconfigparser import BMConfigParser
import protocol
class BMProtoError(ProxyError): pass
class BMConnection(AdvancedDispatcher):
class BMConnection(TLSDispatcher):
# ~1.6 MB which is the maximum possible size of an inv message.
maxMessageSize = 1600100
# protocol specification says max 1000 addresses in one addr command
maxAddrCount = 1000
# protocol specification says max 50000 objects in one inv command
maxObjectCount = 50000
def __init__(self, address=None, sock=None):
AdvancedDispatcher.__init__(self, sock)
@ -25,12 +30,14 @@ class BMConnection(AdvancedDispatcher):
if address is None and sock is not None:
self.destination = self.addr()
self.isOutbound = False
TLSHandshake.__init__(self, sock, server_side=True)
print "received connection in background from %s:%i" % (self.destination[0], self.destination[1])
else:
self.destination = address
self.isOutbound = True
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.connect(self.destination)
TLSHandshake.__init__(self, sock, server_side=False)
print "connecting in background to %s:%i" % (self.destination[0], self.destination[1])
def bm_proto_reset(self):
@ -49,6 +56,11 @@ class BMConnection(AdvancedDispatcher):
self.set_state("bm_header", 0)
return False
def state_bm_ready(self):
self.sendAddr()
self.sendBigInv()
return True
def state_bm_header(self):
if len(self.read_buf) < protocol.Header.size:
print "Length below header size"
@ -74,18 +86,27 @@ class BMConnection(AdvancedDispatcher):
if self.checksum != hashlib.sha512(self.payload).digest()[0:4]:
print "Bad checksum, ignoring"
self.invalid = True
retval = True
if not self.invalid:
try:
getattr(self, "bm_command_" + str(self.command))()
retval = getattr(self, "bm_command_" + str(self.command).lower())()
except AttributeError:
# unimplemented command
print "unimplemented command %s" % (self.command)
else:
print "Skipping command %s due to invalid data" % (self.command)
self.set_state("bm_header", self.payloadLength)
self.bm_proto_reset()
if retval:
self.set_state("bm_header", self.payloadLength)
self.bm_proto_reset()
# else assume the command requires a different state to follow
return True
def bm_command_error(self):
def bm_command_getdata(self):
def bm_command_object(self):
def bm_command_ping(self):
def bm_command_pong(self):
def bm_command_verack(self):
self.verackReceived = True
return True
@ -102,8 +123,171 @@ class BMConnection(AdvancedDispatcher):
self.userAgent = self.payload[readPosition:readPosition + useragentLength]
readPosition += useragentLength
print "user agent: %s" % (self.userAgent)
if not self.peerValidityChecks():
# TODO ABORT
return True
self.write_buf += protocol.CreatePacket('verack')
self.verackSent = True
if ((self.services & protocol.NODE_SSL == protocol.NODE_SSL) and
protocol.haveSSL(not self.isOutbound)):
self.isSSL = True
if self.verackReceived:
if self.isSSL:
self.set_state("tls_init", self.payloadLength)
else:
self.set_state("bm_ready", self.payloadLength)
self.bm_proto_reset()
return False
def peerValidityChecks(self):
if self.remoteProtocolVersion < 3:
self.write_buf += protocol.assembleErrorMessage(fatal=2,
errorText="Your is using an old protocol. Closing connection.")
logger.debug ('Closing connection to old protocol version %s, node: %s',
str(self.remoteProtocolVersion), str(self.peer))
return False
if self.timeOffset > 3600:
self.write_buf += protocol.assembleErrorMessage(fatal=2,
errorText="Your time is too far in the future compared to mine. Closing connection.")
logger.info("%s's time is too far in the future (%s seconds). Closing connection to it.",
self.peer, self.timeOffset)
shared.timeOffsetWrongCount += 1
return False
elif self.timeOffset < -3600:
self.write_buf += protocol.assembleErrorMessage(fatal=2,
errorText="Your time is too far in the past compared to mine. Closing connection.")
logger.info("%s's time is too far in the past (timeOffset %s seconds). Closing connection to it.",
self.peer, self.timeOffset)
shared.timeOffsetWrongCount += 1
return False
else:
shared.timeOffsetWrongCount = 0
if len(self.streams) == 0:
self.write_buf += protocol.assembleErrorMessage(fatal=2,
errorText="We don't have shared stream interests. Closing connection.")))
logger.debug ('Closed connection to %s because there is no overlapping interest in streams.',
str(self.peer))
return False
return True
def sendAddr(self):
def sendChunk():
if numberOfAddressesInAddrMessage == 0:
return
self.write_buf += protocol.CreatePacket('addr', \
addresses.encodeVarint(numberOfAddressesInAddrMessage) + payload)))
# 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.
maxAddrCount = BMConfigParser().safeGetInt("bitmessagesettings", "maxaddrperstreamsend", 500)
# init
addressCount = 0
payload = ''
for stream in self.streams:
addrsInMyStream = {}
addrsInChildStreamLeft = {}
addrsInChildStreamRight = {}
with knownnodes.knownNodesLock:
if len(knownnodes.knownNodes[stream]) > 0:
filtered = {k: v for k, v in knownnodes.knownNodes[stream].items()
if v > (int(time.time()) - shared.maximumAgeOfNodesThatIAdvertiseToOthers)}
elemCount = len(filtered)
if elemCount > maxAddrCount:
elemCount = maxAddrCount
# only if more recent than 3 hours
addrsInMyStream = random.sample(filtered.items(), elemCount)
# sent 250 only if the remote isn't interested in it
if len(knownnodes.knownNodes[stream * 2]) > 0 and stream not in self.streams:
filtered = {k: v for k, v in knownnodes.knownNodes[stream*2].items()
if v > (int(time.time()) - shared.maximumAgeOfNodesThatIAdvertiseToOthers)}
elemCount = len(filtered)
if elemCount > maxAddrCount / 2:
elemCount = int(maxAddrCount / 2)
addrsInChildStreamLeft = random.sample(filtered.items(), elemCount)
if len(knownnodes.knownNodes[(stream * 2) + 1]) > 0 and stream not in self.streams:
filtered = {k: v for k, v in knownnodes.knownNodes[stream*2+1].items()
if v > (int(time.time()) - shared.maximumAgeOfNodesThatIAdvertiseToOthers)}
elemCount = len(filtered)
if elemCount > maxAddrCount / 2:
elemCount = int(maxAddrCount / 2)
addrsInChildStreamRight = random.sample(filtered.items(), elemCount)
for (HOST, PORT), timeLastReceivedMessageFromThisNode in addrsInMyStream:
addressCount += 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
if addressCount >= BMConnection.maxAddrCount:
sendChunk()
payload = ''
addressCount = 0
for (HOST, PORT), timeLastReceivedMessageFromThisNode in addrsInChildStreamLeft:
addressCount += 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
if addressCount >= BMConnection.maxAddrCount:
sendChunk()
payload = ''
addressCount = 0
for (HOST, PORT), timeLastReceivedMessageFromThisNode in addrsInChildStreamRight:
addressCount += 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
if addressCount >= BMConnection.maxAddrCount:
sendChunk()
payload = ''
addressCount = 0
# flush
sendChunk()
def sendBigInv(self):
def sendChunk():
if objectCount == 0:
return
payload = encodeVarint(objectCount) + payload
logger.debug('Sending huge inv message with %i objects to just this one peer',
str(numberOfObjects))
self.write_buf += protocol.CreatePacket('inv', payload)
# Select all hashes for objects in this stream.
bigInvList = {}
for stream in self.streams:
for hash in Inventory().unexpired_hashes_by_stream(stream):
if not self.objectHashHolderInstance.hasHash(hash):
bigInvList[hash] = 0
objectCount = 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
objectCount += 1
if objectCount >= BMConnection.maxObjectCount:
self.sendChunk()
payload = ''
objectCount = 0
# flush
sendChunk()
class Socks5BMConnection(Socks5Connection, BMConnection):
def __init__(self, address):

70
src/network/tls.py
View File

@ -2,57 +2,45 @@
SSL/TLS negotiation.
"""
import asyncore
from network.advanceddispatcher import AdvancedDispatcher
import network.asyncore_pollchoose as asyncore
import socket
import ssl
import sys
import protocol
class TLSHandshake(asyncore.dispatcher):
"""
Negotiates a SSL/TLS connection before handing itself spawning a
dispatcher that can deal with the overlying protocol as soon as the
handshake has been completed.
`handoff` is a function/method called when the handshake has completed.
`address` is a tuple consisting of hostname/address and port to connect to
if nothing is passed in `sock`, which can take an already-connected socket.
`certfile` can take a path to a certificate bundle, and `server_side`
indicates whether the socket is intended to be a server-side or client-side
socket.
"""
class TLSDispatcher(AdvancedDispatcher):
def __init__(self, address=None, sock=None,
certfile=None, keyfile=None, server_side=False, ciphers=None, init_parent=True):
if not hasattr(self, '_map'):
asyncore.dispatcher.__init__(self, sock)
certfile=None, keyfile=None, server_side=False, ciphers=protocol.sslProtocolCiphers):
self.want_read = self.want_write = True
self.certfile = certfile
self.keyfile = keyfile
if certfile is None:
self.certfile = os.path.join(paths.codePath(), 'sslkeys', 'cert.pem')
else:
self.certfile = certfile
if keyfile is None:
self.keyfile = os.path.join(paths.codePath(), 'sslkeys', 'key.pem')
else:
self.keyfile = keyfile
self.server_side = server_side
self.ciphers = ciphers
self.tlsStarted = False
self.tlsDone = False
if sock is None:
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
# logger.info('Connecting to %s%d', address[0], address[1])
self.connect(address)
elif self.connected:
# Initiate the handshake for an already-connected socket.
self.handle_connect()
self.isSSL = False
def handle_connect(self):
def state_tls_init(self):
self.isSSL = True
# Once the connection has been established, it's safe to wrap the
# socket.
if sys.version_info >= (2,7,9):
context = ssl.create_default_context(purpose = ssl.Purpose.SERVER_AUTH if self.server_side else ssl.Purpose.CLIENT_AUTH)
context.set_ciphers(self.ciphers)
# context.set_ecdh_curve("secp256k1")
context.set_ecdh_curve("secp256k1")
context.check_hostname = False
context.verify_mode = ssl.CERT_NONE
# also exclude TLSv1 and TLSv1.1 in the future
context.options |= ssl.OP_NOSSLv2 | ssl.OP_NOSSLv3
self.sslSock = context.wrap_socket(self.sock, server_side = self.server_side, do_handshake_on_connect=False)
context.options = ssl.OP_ALL | ssl.OP_NO_SSLv2 | ssl.OP_NO_SSLv3 | ssl.OP_SINGLE_ECDH_USE | ssl.OP_CIPHER_SERVER_PREFERENCE
self.sslSocket = context.wrap_socket(self.sock, server_side = self.server_side, do_handshake_on_connect=False)
else:
self.sslSocket = ssl.wrap_socket(self.socket,
server_side=self.server_side,
@ -67,20 +55,30 @@ class TLSHandshake(asyncore.dispatcher):
# self.socket.context.set_ecdh_curve("secp256k1")
def writable(self):
return self.want_write
if self.tlsStarted and not self.tlsDone:
return self.want_write
else:
return AdvancedDispacher.writable(self)
def readable(self):
return self.want_read
if self.tlsStarted and not self.tlsDone:
return self.want_read
else:
return AdvancedDispacher.readable(self)
def handle_read(self):
if not self.tlsDone:
if self.tlsStarted and not self.tlsDone:
self._handshake()
else:
return AdvancedDispacher.handle_read(self)
def handle_write(self):
if not self.tlsDone:
if self.tlsStarted and not not self.tlsDone:
self._handshake()
else:
return AdvancedDispacher.handle_write(self)
def _handshake(self):
def state_tls_handshake(self):
"""
Perform the handshake.
"""