453 lines
19 KiB
Python
453 lines
19 KiB
Python
import hashlib
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import time
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from pprint import pprint
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import socket
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from struct import unpack
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from network.advanceddispatcher import AdvancedDispatcher
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from network.node import Node
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import network.asyncore_pollchoose as asyncore
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from network.proxy import Proxy, ProxyError, GeneralProxyError
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from network.socks5 import Socks5Connection, Socks5Resolver, Socks5AuthError, Socks5Error
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from network.socks4a import Socks4aConnection, Socks4aResolver, Socks4aError
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from network.tls import TLSDispatcher
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import addresses
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from bmconfigparser import BMConfigParser
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import shared
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import protocol
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class BMProtoError(ProxyError): pass
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class BMConnection(TLSDispatcher):
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# ~1.6 MB which is the maximum possible size of an inv message.
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maxMessageSize = 1600100
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# protocol specification says max 1000 addresses in one addr command
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maxAddrCount = 1000
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# protocol specification says max 50000 objects in one inv command
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maxObjectCount = 50000
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def __init__(self, address=None, sock=None):
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AdvancedDispatcher.__init__(self, sock)
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self.verackReceived = False
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self.verackSent = False
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if address is None and sock is not None:
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self.destination = self.addr()
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self.isOutbound = False
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TLSDispatcher.__init__(self, sock, server_side=True)
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print "received connection in background from %s:%i" % (self.destination[0], self.destination[1])
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else:
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self.destination = address
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self.isOutbound = True
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self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
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self.connect(self.destination)
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TLSDispatcher.__init__(self, sock, server_side=False)
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print "connecting in background to %s:%i" % (self.destination[0], self.destination[1])
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def bm_proto_reset(self):
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self.magic = None
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self.command = None
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self.payloadLength = None
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self.checksum = None
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self.payload = None
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self.invalid = False
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self.payloadOffset = 0
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def state_init(self):
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self.bm_proto_reset()
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self.append_write_buf(protocol.assembleVersionMessage(self.destination[0], self.destination[1], (1,), False))
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if True:
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print "Sending version (%ib)" % len(self.write_buf)
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self.set_state("bm_header")
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return False
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def state_bm_ready(self):
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print "doing bm ready"
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self.sendAddr()
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self.sendBigInv()
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self.set_state("bm_header")
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return False
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def state_bm_header(self):
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if len(self.read_buf) < protocol.Header.size:
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print "Length below header size"
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return False
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self.magic, self.command, self.payloadLength, self.checksum = protocol.Header.unpack(self.read_buf[:protocol.Header.size])
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self.command = self.command.rstrip('\x00')
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if self.magic != 0xE9BEB4D9:
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# skip 1 byte in order to sync
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self.bm_proto_reset()
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self.set_state("bm_header", 1)
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print "Bad magic"
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if self.payloadLength > BMConnection.maxMessageSize:
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self.invalid = True
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self.set_state("bm_command", protocol.Header.size)
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return True
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def state_bm_command(self):
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if len(self.read_buf) < self.payloadLength:
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print "Length below announced object length"
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return False
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print "received %s (%ib)" % (self.command, self.payloadLength)
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self.payload = self.read_buf[:self.payloadLength]
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if self.checksum != hashlib.sha512(self.payload).digest()[0:4]:
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print "Bad checksum, ignoring"
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self.invalid = True
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retval = True
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if not self.invalid:
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try:
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retval = getattr(self, "bm_command_" + str(self.command).lower())()
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except AttributeError:
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# unimplemented command
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print "unimplemented command %s" % (self.command)
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else:
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print "Skipping command %s due to invalid data" % (self.command)
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if retval:
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self.set_state("bm_header", self.payloadLength)
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self.bm_proto_reset()
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# else assume the command requires a different state to follow
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return True
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def decode_payload_string(self, length):
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value = self.payload[self.payloadOffset:self.payloadOffset+length]
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self.payloadOffset += length
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return value
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def decode_payload_varint(self):
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value, offset = addresses.decodeVarint(self.payload[self.payloadOffset:])
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self.payloadOffset += offset
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return value
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def decode_payload_node(self):
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services, address, port = self.decode_payload_content("Q16sH")
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return Node(services, address, port)
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def decode_payload_content(self, pattern = "v"):
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# l = varint indicating the length of the next item
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# v = varint (or array)
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# H = uint16
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# I = uint32
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# Q = uint64
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# i = net_addr (without time and stream number)
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# s = string
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# 0-9 = length of the next item
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# , = end of array
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retval = []
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size = 0
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insideDigit = False
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for i in range(len(pattern)):
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if pattern[i] in "0123456789":
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size = size * 10 + int(pattern[i])
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continue
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elif pattern[i] == "l":
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size = self.decode_payload_varint()
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continue
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if size > 0:
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innerval = []
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if pattern[i] == "s":
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retval.append(self.payload[self.payloadOffset:self.payloadOffset + size])
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self.payloadOffset += size
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else:
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for j in range(size):
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if "," in pattern[i:]:
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retval.append(self.decode_payload_content(pattern[i:pattern.index(",")]))
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else:
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retval.append(self.decode_payload_content(pattern[i:]))
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size = 0
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else:
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if pattern[i] == "v":
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retval.append(self.decode_payload_varint())
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if pattern[i] == "i":
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retval.append(self.decode_payload_node())
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if pattern[i] == "H":
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retval.append(unpack(">H", self.payload[self.payloadOffset:self.payloadOffset+2])[0])
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self.payloadOffset += 2
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if pattern[i] == "I":
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retval.append(unpack(">I", self.payload[self.payloadOffset:self.payloadOffset+4])[0])
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self.payloadOffset += 4
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if pattern[i] == "Q":
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retval.append(unpack(">Q", self.payload[self.payloadOffset:self.payloadOffset+8])[0])
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self.payloadOffset += 8
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return retval
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def bm_command_error(self):
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fatalStatus, banTime, inventoryVector, errorText = self.decode_payload_content("vvlsls")
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def bm_command_getdata(self):
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items = self.decode_payload_content("l32s")
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#self.antiIntersectionDelay(True) # only handle getdata requests if we have been connected long enough
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for i in items:
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logger.debug('received getdata request for item:' + hexlify(i))
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if self.objectHashHolderInstance.hasHash(i):
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self.antiIntersectionDelay()
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else:
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if i in Inventory():
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self.append_write_buf(protocol.CreatePacket('object', Inventory()[i].payload))
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else:
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#self.antiIntersectionDelay()
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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,))
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def bm_command_object(self):
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lengthOfTimeWeShouldUseToProcessThisMessage = shared.checkAndShareObjectWithPeers(self.payload)
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self.downloadQueue.task_done(calculateInventoryHash(self.payload))
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def bm_command_addr(self):
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addresses = self.decode_payload_content("lQbQ16sH")
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def bm_command_ping(self):
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self.append_write_buf(protocol.CreatePacket('pong'))
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def bm_command_pong(self):
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# nothing really
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pass
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def bm_command_verack(self):
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self.verackReceived = True
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if self.verackSent:
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if self.isSSL:
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self.set_state("tls_init", self.payloadLength)
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else:
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self.set_state("bm_ready", self.payloadLength)
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else:
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self.set_state("bm_header", self.payloadLength)
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self.bm_proto_reset()
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return False
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def bm_command_version(self):
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#self.remoteProtocolVersion, self.services, self.timestamp, padding1, self.myExternalIP, padding2, self.remoteNodeIncomingPort = protocol.VersionPacket.unpack(self.payload[:protocol.VersionPacket.size])
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self.remoteProtocolVersion, self.services, self.timestamp, self.sockNode, self.peerNode, self.nonce, self.userAgent, self.streams = self.decode_payload_content("IQQiiQlslv")
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self.timeOffset = self.timestamp - int(time.time())
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print "remoteProtocolVersion: %i" % (self.remoteProtocolVersion)
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print "services: %08X" % (self.services)
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print "time offset: %i" % (self.timestamp - int(time.time()))
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print "my external IP: %s" % (self.sockNode.address)
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print "remote node incoming port: %i" % (self.peerNode.port)
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print "user agent: %s" % (self.userAgent)
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if not self.peerValidityChecks():
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# TODO ABORT
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return True
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self.append_write_buf(protocol.CreatePacket('verack'))
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self.verackSent = True
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if ((self.services & protocol.NODE_SSL == protocol.NODE_SSL) and
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protocol.haveSSL(not self.isOutbound)):
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self.isSSL = True
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if self.verackReceived:
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if self.isSSL:
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self.set_state("tls_init", self.payloadLength)
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else:
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self.set_state("bm_ready", self.payloadLength)
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self.bm_proto_reset()
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return False
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def peerValidityChecks(self):
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if self.remoteProtocolVersion < 3:
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self.append_write_buf(protocol.assembleErrorMessage(fatal=2,
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errorText="Your is using an old protocol. Closing connection."))
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logger.debug ('Closing connection to old protocol version %s, node: %s',
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str(self.remoteProtocolVersion), str(self.peer))
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return False
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if self.timeOffset > 3600:
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self.append_write_buf(protocol.assembleErrorMessage(fatal=2,
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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.",
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self.peer, self.timeOffset)
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shared.timeOffsetWrongCount += 1
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return False
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elif self.timeOffset < -3600:
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self.append_write_buf(protocol.assembleErrorMessage(fatal=2,
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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.",
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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.streams) == 0:
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self.append_write_buf(protocol.assembleErrorMessage(fatal=2,
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errorText="We don't have shared stream interests. Closing connection."))
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logger.debug ('Closed connection to %s because there is no overlapping interest in streams.',
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str(self.peer))
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return False
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return True
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def sendAddr(self):
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def sendChunk():
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if numberOfAddressesInAddrMessage == 0:
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return
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self.append_write_buf(protocol.CreatePacket('addr', \
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addresses.encodeVarint(numberOfAddressesInAddrMessage) + payload))
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# We are going to share a maximum number of 1000 addrs (per overlapping
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# stream) with our peer. 500 from overlapping streams, 250 from the
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# left child stream, and 250 from the right child stream.
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maxAddrCount = BMConfigParser().safeGetInt("bitmessagesettings", "maxaddrperstreamsend", 500)
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# init
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addressCount = 0
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payload = ''
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for stream in self.streams:
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addrsInMyStream = {}
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addrsInChildStreamLeft = {}
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addrsInChildStreamRight = {}
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with knownnodes.knownNodesLock:
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if len(knownnodes.knownNodes[stream]) > 0:
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filtered = {k: v for k, v in knownnodes.knownNodes[stream].items()
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if v > (int(time.time()) - shared.maximumAgeOfNodesThatIAdvertiseToOthers)}
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elemCount = len(filtered)
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if elemCount > maxAddrCount:
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elemCount = maxAddrCount
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# only if more recent than 3 hours
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addrsInMyStream = random.sample(filtered.items(), elemCount)
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# sent 250 only if the remote isn't interested in it
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if len(knownnodes.knownNodes[stream * 2]) > 0 and stream not in self.streams:
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filtered = {k: v for k, v in knownnodes.knownNodes[stream*2].items()
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if v > (int(time.time()) - shared.maximumAgeOfNodesThatIAdvertiseToOthers)}
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elemCount = len(filtered)
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if elemCount > maxAddrCount / 2:
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elemCount = int(maxAddrCount / 2)
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addrsInChildStreamLeft = random.sample(filtered.items(), elemCount)
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if len(knownnodes.knownNodes[(stream * 2) + 1]) > 0 and stream not in self.streams:
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filtered = {k: v for k, v in knownnodes.knownNodes[stream*2+1].items()
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if v > (int(time.time()) - shared.maximumAgeOfNodesThatIAdvertiseToOthers)}
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elemCount = len(filtered)
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if elemCount > maxAddrCount / 2:
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elemCount = int(maxAddrCount / 2)
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addrsInChildStreamRight = random.sample(filtered.items(), elemCount)
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for (HOST, PORT), timeLastReceivedMessageFromThisNode in addrsInMyStream:
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addressCount += 1
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payload += pack(
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'>Q', timeLastReceivedMessageFromThisNode) # 64-bit time
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payload += pack('>I', stream)
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payload += pack(
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'>q', 1) # service bit flags offered by this node
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payload += protocol.encodeHost(HOST)
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payload += pack('>H', PORT) # remote port
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if addressCount >= BMConnection.maxAddrCount:
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sendChunk()
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payload = ''
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addressCount = 0
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for (HOST, PORT), timeLastReceivedMessageFromThisNode in addrsInChildStreamLeft:
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addressCount += 1
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payload += pack(
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'>Q', timeLastReceivedMessageFromThisNode) # 64-bit time
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payload += pack('>I', stream * 2)
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payload += pack(
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'>q', 1) # service bit flags offered by this node
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payload += protocol.encodeHost(HOST)
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payload += pack('>H', PORT) # remote port
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if addressCount >= BMConnection.maxAddrCount:
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sendChunk()
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payload = ''
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addressCount = 0
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for (HOST, PORT), timeLastReceivedMessageFromThisNode in addrsInChildStreamRight:
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addressCount += 1
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payload += pack(
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'>Q', timeLastReceivedMessageFromThisNode) # 64-bit time
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payload += pack('>I', (stream * 2) + 1)
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payload += pack(
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'>q', 1) # service bit flags offered by this node
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payload += protocol.encodeHost(HOST)
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payload += pack('>H', PORT) # remote port
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if addressCount >= BMConnection.maxAddrCount:
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sendChunk()
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payload = ''
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addressCount = 0
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# flush
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sendChunk()
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def sendBigInv(self):
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def sendChunk():
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if objectCount == 0:
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return
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payload = encodeVarint(objectCount) + payload
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logger.debug('Sending huge inv message with %i objects to just this one peer',
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str(numberOfObjects))
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self.append_write_buf(protocol.CreatePacket('inv', payload))
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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.streams:
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for hash in Inventory().unexpired_hashes_by_stream(stream):
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if not self.objectHashHolderInstance.hasHash(hash):
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bigInvList[hash] = 0
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objectCount = 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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objectCount += 1
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if objectCount >= BMConnection.maxObjectCount:
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self.sendChunk()
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payload = ''
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objectCount = 0
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# flush
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sendChunk()
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class Socks5BMConnection(Socks5Connection, BMConnection):
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def __init__(self, address):
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Socks5Connection.__init__(self, address=address)
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def state_socks_handshake_done(self):
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BMConnection.state_init(self)
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return False
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class Socks4aBMConnection(Socks4aConnection, BMConnection):
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def __init__(self, address):
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Socks4aConnection.__init__(self, address=address)
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def state_socks_handshake_done(self):
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BMConnection.state_init(self)
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return False
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class BMServer(AdvancedDispatcher):
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port = 8444
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def __init__(self, port=None):
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if not hasattr(self, '_map'):
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AdvancedDispatcher.__init__(self)
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self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
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self.set_reuse_addr()
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if port is None:
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port = BMServer.port
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self.bind(('127.0.0.1', port))
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self.connections = 0
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self.listen(5)
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def handle_accept(self):
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pair = self.accept()
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if pair is not None:
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sock, addr = pair
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BMConnection(sock=sock)
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if __name__ == "__main__":
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# initial fill
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for host in (("127.0.0.1", 8448),):
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direct = BMConnection(host)
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while len(asyncore.socket_map) > 0:
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print "loop, state = %s" % (direct.state)
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asyncore.loop(timeout=10, count=1)
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continue
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proxy = Socks5BMConnection(host)
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while len(asyncore.socket_map) > 0:
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# print "loop, state = %s" % (proxy.state)
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asyncore.loop(timeout=10, count=1)
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proxy = Socks4aBMConnection(host)
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while len(asyncore.socket_map) > 0:
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# print "loop, state = %s" % (proxy.state)
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asyncore.loop(timeout=10, count=1)
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