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main.py
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from urllib import quote
import requests
from hashlib import sha1
from bencode import *
from twisted.internet import protocol, reactor
import socket
import ipaddress
import struct
from bitstring import *
class State:
Handshake, Bitfield, Choke, UnChoke, Interested, Have, NotInterested, Request, Piece, KeepAlive, Bad = range(11)
class EchoClient(protocol.Protocol):
def __init__(self, message, bDict):
self.message = message
self.recievedHandshake = False;
self.bytesLeft = -1
self.payload = ""
self.bufferList = []
self.state = State.Handshake
self.payloadStillFetching = False
self.hasPayload = False
self.pieceNum = len(bDict["info"]["pieces"]) / 20
self.payloadBit = BitArray("0xF"*self.pieceNum)
self.nextMessage = False
self.bDict = bDict
self.pieceList = []
self.noPiecePresent = []
self.requestList = []
self.index = 0;
self.pieceDone = False;
self.pLength = int(bDict["info"]["piece length"]);
self.endLength = (int(bDict["info"]["length"]) % self.pLength)
self.pieceBuffer = 2**14
self.pieceRemaining = self.pLength
toHex = lambda self, x:"0x".join([hex(ord(c))[:].zfill(2) for c in x])
def connectionMade(self):
self.transport.write(self.message)
def getMessage(self, data):
print(data.split("gg"))
if(data == '' or len(data) < 4):
self.state = State.Bad
return
data = [ord(data[0]), ord(data[1]), ord(data[2]), ord(data[3]), ord(data[4])]
if(data[3] == 1 and data[4] == 0):
self.state = State.Choke
elif(data[3] == 1 and data[4] == 1):
self.state = State.UnChoke
self.hasPayload = False
elif(data[3] == 1 and data[4] == 2):
self.state = State.Interested
elif(data[3] == 5 and data[4] == 4):
self.state = State.Have
self.hasPayload = True
elif(data[3] == 1 and data[4] == 3):
self.state = State.NotInterested
elif(data[3] == 13 and data[4] == 6):
self.state = State.Request
elif(data[3] == 13 and data[4] == 8):
self.state = State.Cancel
elif(data[4] == 7):
self.state = State.Piece
self.hasPayload = True
elif(data[4] == 5):
self.state = State.Bitfield
self.hasPayload = True
else:
self.state = State.Bad
self.hasPayload = False
def getPayload(self, data):
if(len(data) < self.bytesLeft):
self.payload = self.payload + data
self.bytesLeft -= len(data)
if(self.state == State.Piece):
self.pieceBuffer -= len(data)
self.payloadStillFetching = True
self.nextMessage = False
else:
self.payload = self.payload + data[:self.bytesLeft]
data = data[self.bytesLeft:]
self.bytesLeft = 0;
if(self.state == State.Bitfield):
self.payloadBit = BitArray(self.toHex(self.payload))
if(self.state == State.Have):
bitA = BitArray(self.toHex(self.payload)).int
print bitA
self.payloadBit.set(True, bitA)
if(self.state == State.Piece):
isTrue = struct.unpack("!20s", sha1(self.payload).digest()) == struct.unpack("!20s", self.bDict["info"]["pieces"][20*self.index:20 + 20*self.index ])
print isTrue
if(isTrue):
self.pieceList[self.index] = self.payload
else:
self.noPiecesPresent.append(self.index)
self.pieceDone = True
#print struct.unpack("!20s", sha1(self.payload).digest())
#print self.bDict["info"]["pieces"][0:20]
#print struct.unpack("!20s", self.bDict["info"]["pieces"][:20])
print len(self.payload)#.split("gg")
if(len(self.requestList) == 0):
f = open(self.bDict["info"]["name"], "wb")
for item in self.pieceList:
if(item != None):
f.write(item)
else:
print "Nooo"
f.close()
self.transport.loseConnection()
self.payloadStillFetching = False
self.hasPayload = False
self.nextMessage = True
self.payload = ""
return data
def sendInterested(self):
message = struct.pack("!IB", 1, 2 )
self.transport.write(message)
print("wrote")
def sendRequest(self, index, offset, length=2**14):
message = struct.pack("!IBIII", 13, 6, int(index), int(offset), length)
self.transport.write(message)
def makeRequest(self):
for i in range(self.pieceNum):
if(self.payloadBit[i]):
self.requestList.append(i)
else:
self.noPiecePresent.append(i)
def getNextRequest(self):
self.requestList.reverse()
index = self.requestList.pop()
self.requestList.reverse()
return index
def parseData(self, data):
if(self.state != State.Piece or self.nextMessage):
self.getMessage(data[:5])
if(self.hasPayload and not self.payloadStillFetching):
if(self.state == State.Bitfield):
self.bytesLeft = ord(data[3]) - 1
if(self.state == State.Have):
self.bytesLeft = 4
if(self.state == State.Piece):
self.bytesLeft = self.pLength
self.pieceBufferer = 2**14
if(len(self.requestList) == 0):
self.bytesLeft = self.endLength
data = data[8:]
#print data.split("dd")
data = self.getPayload(data[5:])
elif(not self.nextMessage and self.payloadStillFetching):
if(self.state == State.Piece and self.pieceBuffer == 2**14):
data = data[13:]
data = self.getPayload(data)
elif(not self.hasPayload and not self.payloadStillFetching):
print("No payload")
self.nextMessage = True
if(self.state == State.Piece and self.pieceBuffer == 0):
self.pieceBuffer = 2**14
base = self.pLength
leng = 2**14
if(len(self.requestList) == 0):
base = self.endLength
if(self.bytesLeft < 2**14):
leng = self.bytesLeft
self.sendRequest(self.index, base - self.bytesLeft, leng)
if(self.state == State.UnChoke):
self.makeRequest()
self.index = self.getNextRequest()
print self.index
self.sendRequest(self.index, 0)
if(self.state == State.Bad):
data = data[5:]
if(self.nextMessage):
if(len(data) > 5):
self.parseData(data)
if(self.pieceDone and len(self.requestList) != 0):
self.pieceDone = False
self.index = self.getNextRequest()
print self.index
self.sendRequest(self.index, 0)
def dataReceived(self, data):
print "hit"
if(self.state == State.Handshake):
self.hasPayload = True
print(struct.unpack("!8x20s20s", data[20:68]))
self.parseData(data[68:])
if(not self.payloadStillFetching and (self.state == State.Have or self.state == State.Bitfield)):
print self.payloadBit.bin
self.pieceList = self.pieceNum * [None]
self.sendInterested()
print "testrtttttttttttttttttttt"
print ";;;"
else:
self.parseData(data)
#self.sendInterested()
#self.sendRequest()
if(not self.payloadStillFetching and (self.state == State.Have or self.state == State.Bitfield)):
print self.payloadBit.bin
self.pieceList = self.pieceNum * [None]
self.sendInterested()
#self.transport.loseConnection()
class EchoFactory(protocol.ClientFactory):
def __init__(self, message, bDict):
self.message = message
self.d = bDict
def buildProtocol(self, addr):
print "Connecting to peer "
return EchoClient(self.message, self.d)
def clientConnectionFailed(self, connector, reason):
print reason
reactor.stop()
def clientConnectionLost(self, connector, reason):
print "Connection lost."
print reason
reactor.stop()
class BitClient:
def __init__(self, bDict, peerID):
self.peerID = peerID
self.bDict = bDict
self.infoHash = self.getInfoHash()
def getInfoHash(self):
return sha1(bencode(self.bDict["info"])).digest()
def getPeerID(self):
return self.peerID
def connectToTracker(self):
announce = self.bDict["announce"]
port = 6900
uploaded = 0
downloaded = 0
left = self.bDict["info"]["piece length"]
print(left)
event = "started"
compact = 1
payload = {'info_hash':self.infoHash, 'peer_id':self.peerID, 'uploaded':uploaded, "port":port, 'downloaded':downloaded, "left":left, 'event':event, "compact":compact, "ip":socket.gethostbyname(socket.gethostname())}
r = requests.get(announce, params=payload)
return bdecode(r.text)
def getIPPortList(self):
ip = []
request = self.connectToTracker()
for index in range(0, len(request["peers"]), 6):
b = bytearray(request["peers"][index:index+4], encoding="latin1")
port = ord(request["peers"][index+4])*256 + (ord(request["peers"][index+5]))
ip.append((ipaddress.IPv4Address(str(b)).exploded, port))
return ip
def sendHandshake(self):
handshake = "\x13BitTorrent protocol" + struct.pack("!8x20s20s", self.infoHash, self.peerID)
ip = self.getIPPortList();
self.sendToSinglePeer("127.0.0.1", 45030, handshake)
#self.sendToSinglePeer(ip[5][0], ip[5][1], handshake)
def sendToSinglePeer(self, ip, port, message):
reactor.connectTCP(ip, port, EchoFactory(message, self.bDict))
reactor.run()
def main(filename):
file = open(filename, 'rb')
benDict = bdecode(file.read())
peerID = "-IO0001-012345678901"
client = BitClient(benDict, peerID)
client.sendHandshake()