Reference client for Bitmessage: a P2P encrypted decentralised communication protocol:
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import errno
import threading
import time
import random
import shared
import select
import socks
import socket
import sys
import tr
from class_sendDataThread import *
from class_receiveDataThread import *
from configparser import BMConfigParser
from helper_threading import *
import knownnodes
import queues
import state
# For each stream to which we connect, several outgoingSynSender threads
# will exist and will collectively create 8 connections with peers.
class outgoingSynSender(threading.Thread, StoppableThread):
def __init__(self):
threading.Thread.__init__(self, name="outgoingSynSender")
self.initStop()
def setup(self, streamNumber, selfInitiatedConnections):
self.streamNumber = streamNumber
self.selfInitiatedConnections = selfInitiatedConnections
def _getPeer(self):
# If the user has specified a trusted peer then we'll only
# ever connect to that. Otherwise we'll pick a random one from
# the known nodes
if state.trustedPeer:
with knownnodes.knownNodesLock:
peer = state.trustedPeer
knownnodes.knownNodes[self.streamNumber][peer] = time.time()
else:
while not self._stopped:
with knownnodes.knownNodesLock:
try:
peer, = random.sample(knownnodes.knownNodes[self.streamNumber], 1)
except ValueError: # no known nodes
self.stop.wait(1)
continue
priority = (183600 - (time.time() - knownnodes.knownNodes[self.streamNumber][peer])) / 183600 # 2 days and 3 hours
if BMConfigParser().get('bitmessagesettings', 'socksproxytype') != 'none':
if peer.host.find(".onion") == -1:
priority /= 10 # hidden services have 10x priority over plain net
else:
# don't connect to self
if peer.host == BMConfigParser().get('bitmessagesettings', 'onionhostname') and peer.port == BMConfigParser().getint("bitmessagesettings", "onionport"):
continue
elif peer.host.find(".onion") != -1: # onion address and so proxy
continue
if priority <= 0.001: # everyone has at least this much priority
priority = 0.001
if (random.random() <= priority):
break
self.stop.wait(0.01) # prevent CPU hogging if something is broken
try:
return peer
except NameError:
return state.Peer('127.0.0.1', 8444)
def stopThread(self):
super(outgoingSynSender, self).stopThread()
try:
self.sock.shutdown(socket.SHUT_RDWR)
except:
pass
def run(self):
while BMConfigParser().safeGetBoolean('bitmessagesettings', 'dontconnect') and not self._stopped:
self.stop.wait(2)
while BMConfigParser().safeGetBoolean('bitmessagesettings', 'sendoutgoingconnections') and not self._stopped:
self.name = "outgoingSynSender"
maximumConnections = 1 if state.trustedPeer else BMConfigParser().safeGetInt('bitmessagesettings', 'maxoutboundconnections')
while len(self.selfInitiatedConnections[self.streamNumber]) >= maximumConnections and not self._stopped:
self.stop.wait(10)
if state.shutdown:
break
random.seed()
peer = self._getPeer()
shared.alreadyAttemptedConnectionsListLock.acquire()
while peer in shared.alreadyAttemptedConnectionsList or peer.host in shared.connectedHostsList:
shared.alreadyAttemptedConnectionsListLock.release()
# print 'choosing new sample'
random.seed()
peer = self._getPeer()
self.stop.wait(1)
if self._stopped:
break
# Clear out the shared.alreadyAttemptedConnectionsList every half
# hour so that this program will again attempt a connection
# to any nodes, even ones it has already tried.
if (time.time() - shared.alreadyAttemptedConnectionsListResetTime) > 1800:
shared.alreadyAttemptedConnectionsList.clear()
shared.alreadyAttemptedConnectionsListResetTime = int(
time.time())
shared.alreadyAttemptedConnectionsListLock.acquire()
shared.alreadyAttemptedConnectionsList[peer] = 0
try:
shared.alreadyAttemptedConnectionsListLock.release()
except threading.ThreadError as e:
pass
if self._stopped:
break
self.name = "outgoingSynSender-" + peer.host.replace(":", ".") # log parser field separator
address_family = socket.AF_INET
# Proxy IP is IPv6. Unlikely but possible
if BMConfigParser().get('bitmessagesettings', 'socksproxytype') != 'none':
if ":" in BMConfigParser().get('bitmessagesettings', 'sockshostname'):
address_family = socket.AF_INET6
# No proxy, and destination is IPv6
elif peer.host.find(':') >= 0 :
address_family = socket.AF_INET6
try:
self.sock = socks.socksocket(address_family, socket.SOCK_STREAM)
except:
"""
The line can fail on Windows systems which aren't
64-bit compatiable:
File "C:\Python27\lib\socket.py", line 187, in __init__
_sock = _realsocket(family, type, proto)
error: [Errno 10047] An address incompatible with the requested protocol was used
So let us remove the offending address from our knownNodes file.
"""
with knownnodes.knownNodesLock:
try:
del knownnodes.knownNodes[self.streamNumber][peer]
except KeyError:
pass
logger.debug('deleting ' + str(peer) + ' from knownnodes.knownNodes because it caused a socks.socksocket exception. We must not be 64-bit compatible.')
continue
# This option apparently avoids the TIME_WAIT state so that we
# can rebind faster
self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.sock.settimeout(20)
if BMConfigParser().get('bitmessagesettings', 'socksproxytype') == 'none' and shared.verbose >= 2:
logger.debug('Trying an outgoing connection to ' + str(peer))
# sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
elif BMConfigParser().get('bitmessagesettings', 'socksproxytype') == 'SOCKS4a':
if shared.verbose >= 2:
logger.debug ('(Using SOCKS4a) Trying an outgoing connection to ' + str(peer))
proxytype = socks.PROXY_TYPE_SOCKS4
sockshostname = BMConfigParser().get(
'bitmessagesettings', 'sockshostname')
socksport = BMConfigParser().getint(
'bitmessagesettings', 'socksport')
rdns = True # Do domain name lookups through the proxy; though this setting doesn't really matter since we won't be doing any domain name lookups anyway.
if BMConfigParser().getboolean('bitmessagesettings', 'socksauthentication'):
socksusername = BMConfigParser().get(
'bitmessagesettings', 'socksusername')
sockspassword = BMConfigParser().get(
'bitmessagesettings', 'sockspassword')
self.sock.setproxy(
proxytype, sockshostname, socksport, rdns, socksusername, sockspassword)
else:
self.sock.setproxy(
proxytype, sockshostname, socksport, rdns)
elif BMConfigParser().get('bitmessagesettings', 'socksproxytype') == 'SOCKS5':
if shared.verbose >= 2:
logger.debug ('(Using SOCKS5) Trying an outgoing connection to ' + str(peer))
proxytype = socks.PROXY_TYPE_SOCKS5
sockshostname = BMConfigParser().get(
'bitmessagesettings', 'sockshostname')
socksport = BMConfigParser().getint(
'bitmessagesettings', 'socksport')
rdns = True # Do domain name lookups through the proxy; though this setting doesn't really matter since we won't be doing any domain name lookups anyway.
if BMConfigParser().getboolean('bitmessagesettings', 'socksauthentication'):
socksusername = BMConfigParser().get(
'bitmessagesettings', 'socksusername')
sockspassword = BMConfigParser().get(
'bitmessagesettings', 'sockspassword')
self.sock.setproxy(
proxytype, sockshostname, socksport, rdns, socksusername, sockspassword)
else:
self.sock.setproxy(
proxytype, sockshostname, socksport, rdns)
try:
self.sock.connect((peer.host, peer.port))
if self._stopped:
self.sock.shutdown(socket.SHUT_RDWR)
self.sock.close()
return
someObjectsOfWhichThisRemoteNodeIsAlreadyAware = {} # This is not necessairly a complete list; we clear it from time to time to save memory.
sendDataThreadQueue = Queue.Queue() # Used to submit information to the send data thread for this connection.
sd = sendDataThread(sendDataThreadQueue)
sd.setup(self.sock, peer.host, peer.port, self.streamNumber,
someObjectsOfWhichThisRemoteNodeIsAlreadyAware)
sd.start()
rd = receiveDataThread()
rd.daemon = True # close the main program even if there are threads left
rd.setup(self.sock,
peer.host,
peer.port,
self.streamNumber,
someObjectsOfWhichThisRemoteNodeIsAlreadyAware,
self.selfInitiatedConnections,
sendDataThreadQueue,
sd.objectHashHolderInstance)
rd.start()
sd.sendVersionMessage()
logger.debug(str(self) + ' connected to ' + str(peer) + ' during an outgoing attempt.')
except socks.GeneralProxyError as err:
if err[0][0] in [7, 8, 9]:
logger.error('Error communicating with proxy: %s', str(err))
queues.UISignalQueue.put((
'updateStatusBar',
tr._translate(
"MainWindow", "Problem communicating with proxy: %1. Please check your network settings.").arg(str(err[0][1]))
))
self.stop.wait(1)
continue
elif shared.verbose >= 2:
logger.debug('Could NOT connect to ' + str(peer) + ' during outgoing attempt. ' + str(err))
deletedPeer = None
with knownnodes.knownNodesLock:
"""
It is remotely possible that peer is no longer in knownnodes.knownNodes.
This could happen if two outgoingSynSender threads both try to
connect to the same peer, both fail, and then both try to remove
it from knownnodes.knownNodes. This is unlikely because of the
alreadyAttemptedConnectionsList but because we clear that list once
every half hour, it can happen.
"""
if peer in knownnodes.knownNodes[self.streamNumber]:
timeLastSeen = knownnodes.knownNodes[self.streamNumber][peer]
if (int(time.time()) - timeLastSeen) > 172800 and len(knownnodes.knownNodes[self.streamNumber]) > 1000: # for nodes older than 48 hours old if we have more than 1000 hosts in our list, delete from the knownnodes.knownNodes data-structure.
del knownnodes.knownNodes[self.streamNumber][peer]
deletedPeer = peer
if deletedPeer:
str ('deleting ' + str(peer) + ' from knownnodes.knownNodes because it is more than 48 hours old and we could not connect to it.')
except socks.Socks5AuthError as err:
queues.UISignalQueue.put((
'updateStatusBar', tr._translate(
"MainWindow", "SOCKS5 Authentication problem: %1. Please check your SOCKS5 settings.").arg(str(err))))
except socks.Socks5Error as err:
if err[0][0] in [3, 4, 5, 6]:
# this is a more bening "error": host unreachable, network unreachable, connection refused, TTL expired
logger.debug('SOCKS5 error: %s', str(err))
else:
logger.error('SOCKS5 error: %s', str(err))
if err[0][0] == 4 or err[0][0] == 2:
state.networkProtocolAvailability[protocol.networkType(peer.host)] = False
except socks.Socks4Error as err:
logger.error('Socks4Error: ' + str(err))
except socket.error as err:
if BMConfigParser().get('bitmessagesettings', 'socksproxytype')[0:5] == 'SOCKS':
logger.error('Bitmessage MIGHT be having trouble connecting to the SOCKS server. ' + str(err))
else:
if err[0] == errno.ENETUNREACH:
state.networkProtocolAvailability[protocol.networkType(peer.host)] = False
if shared.verbose >= 1:
logger.debug('Could NOT connect to ' + str(peer) + 'during outgoing attempt. ' + str(err))
deletedPeer = None
with knownnodes.knownNodesLock:
"""
It is remotely possible that peer is no longer in knownnodes.knownNodes.
This could happen if two outgoingSynSender threads both try to
connect to the same peer, both fail, and then both try to remove
it from knownnodes.knownNodes. This is unlikely because of the
alreadyAttemptedConnectionsList but because we clear that list once
every half hour, it can happen.
"""
if peer in knownnodes.knownNodes[self.streamNumber]:
timeLastSeen = knownnodes.knownNodes[self.streamNumber][peer]
if (int(time.time()) - timeLastSeen) > 172800 and len(knownnodes.knownNodes[self.streamNumber]) > 1000: # for nodes older than 48 hours old if we have more than 1000 hosts in our list, delete from the knownnodes.knownNodes data-structure.
del knownnodes.knownNodes[self.streamNumber][peer]
deletedPeer = peer
if deletedPeer:
logger.debug('deleting ' + str(peer) + ' from knownnodes.knownNodes because it is more than 48 hours old and we could not connect to it.')
except Exception as err:
import traceback
logger.exception('An exception has occurred in the outgoingSynSender thread that was not caught by other exception types:')
self.stop.wait(0.1)