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gnutella.py
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gnutella.py
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#!/usr/bin/python
# CS 114 Gnutella Project
import socket
import sys
import os
import re
import random
import time
from uuid import getnode as getmac
from urllib2 import urlopen
from twisted.internet import reactor, protocol, stdio
from twisted.protocols import basic
from twisted.web.server import Site
from twisted.web.static import File
#from twisted.web import client
"""
GLOBAL DATA
"""
connections = []
listener = None
nodeID = None
files = []
directory = None
logPath = None
logFile = None
IP = None
port = 0
serverPort = None
initiating = True
msgID = 0
msgRoutes = {}
msgTimeout = 3.0
netData = []
MIN_CONNS = 3
MAX_CONNS = 10
UNDER_PROB = 50
OVER_PROB = 10
"""
GNUTELLA TWISTED CLASSES
"""
class GnutellaProtocol(basic.LineReceiver):
def __init__(self):
self.output = None
self.normalizeNewlines = True
self.initiator = False
self.verified = True
def setInitiator(self):
self.initiator = True
self.verified = False
def connectionMade(self):
#inputForwarder = DataForwardingProtocol()
#inputForwarder.output = self.transport
#inputForwarder.normalizeNewlines = True
#stdioWrapper = stdio.StandardIO(inputForwarder)
#self.output = stdioWrapper
connections.append(self)
peer = self.transport.getPeer()
writeLog("Connected to {0}:{1}\n".format(peer.host, peer.port))
if self.initiator:
global port
self.transport.write("GNUTELLA CONNECT/0.4\n{0}\n;".format(port))
writeLog("Sending GNUTELLA CONNECT to {0}:{1}\n".format(peer.host, peer.port))
host = self.transport.getHost()
global IP
IP = host.host
def connectionLost(self, reason):
connections.remove(self)
peer = self.transport.getPeer()
writeLog("Disconnected with {0}:{1}\n".format(peer.host, peer.port))
makePeerConnection()
def dataReceived(self, data):
peer = self.transport.getPeer()
#writeLog("\nData received from %s: %s" % (peer.port, data))
lines = data.split(";")
for line in lines:
if (len(line) > 0):
self.handleMessage(line)
def handleMessage(self, data):
peer = self.transport.getPeer()
if(data.startswith("GNUTELLA CONNECT")):
self.peerPort = int(data.split('\n')[1])
writeLog("Received GNUTELLA CONNECT from {0}:{1}\n".format(peer.host, peer.port))
if(len(connections) <= MAX_CONNS):
global port
self.transport.write("GNUTELLA OK\n{0}\n;".format(port))
writeLog("Sending GNUTELLA OK to {0}:{1}\n".format(peer.host, peer.port))
else:
self.transport.write("WE'RE OUT OF NUTELLA\n;")
writeLog("Sending WE'RE OUT OF NUTELLA to {0}:{1}\n".format(peer.host, peer.peer))
elif (self.initiator and not self.verified):
if(data.startswith("GNUTELLA OK")):
self.peerPort = int(data.split('\n')[1])
writeLog("Connection with {0}:{1} verified\n".format(peer.host, peer.port))
self.verified = True
self.sendPing()
else:
writeLog("Connection with {0}:{1} rejected\n".format(peer.host, peer.port))
reactor.stop()
else:
#writeLog("\nIncoming message: {0}\n".format(data))
writeLog("\n")
message = data.split('&', 3)
msgid = message[0]
pldescrip = int(message[1])
ttl = int(message[2])
payload = message[3]
if(pldescrip == 0):
writeLog("Received PING: msgid={0} ttl={1}\n".format(msgid, ttl))
self.handlePing(msgid, ttl)
elif(pldescrip == 1):
writeLog("Received PONG: msgid={0} payload={1}\n".format(msgid, payload))
self.handlePong(msgid, payload)
elif(pldescrip == 80):
writeLog("Received Query: msgid={0} ttl={1} query={2}\n".format(msgid, ttl, payload))
self.handleQuery(msgid, ttl, payload)
elif(pldescrip == 81):
writeLog("Received QueryHit: msgid={0} payload={1}\n".format(msgid, payload))
self.handleQueryHit(msgid, payload)
def buildHeader(self, descrip, ttl):
global msgID
header = "{0}{1:03}".format(nodeID, msgID)
msgID += 1
if(msgID > 999):
msgID = 0
return "{0}&{1}&{2}&".format(header, descrip, ttl)
def sendPing(self, msgid=None, ttl=7):
if(ttl <= 0):
return
if msgid:
message = "{0}&{1}&{2}&".format(msgid, "00", ttl)
writeLog("Forwarding PING: {0}\n".format(message))
else:
message = self.buildHeader("00", ttl)
writeLog("Sending PING: {0}\n".format(message))
message = "{0};".format(message)
for cn in connections:
if(msgid == None or cn != self):
cn.transport.write(message)
def sendPong(self, msgid, payload=None):
nfiles = 0
nkb = 0
global port
IP = self.transport.getHost().host
header = "{0}&{1}&{2}&".format(msgid, "01", 7)
if payload:
message = "{0}{1};".format(header, payload)
writeLog("Forwarding PONG: {0}\n".format(message))
else:
#message = "{0}{1}&{2}&{3}&{4};".format(header, port, IP, nfiles, nkb)
message = "{0}{1}&{2};".format(header, port, IP)
writeLog("Sending PONG: {0}\n".format(message))
global msgRoutes
msgRoutes[msgid][0].transport.write(message)
def handlePing(self, msgid, ttl):
#send pong, store data, forward ping
if isValid(msgid):
return
global msgRoutes
msgRoutes[msgid] = (self, time.time())
self.sendPong(msgid)
self.sendPing(msgid, ttl-1)
def handlePong(self, msgid, payload):
global nodeID
global netData
info = payload.split("&")
node_data = (int(info[0]), info[1])
if info not in netData:
netData.append(node_data)
if(msgid.startswith(nodeID)):
makePeerConnection(node_data[1], node_data[0])
else:
self.sendPong(msgid, payload)
makePeerConnection()
def sendQuery(self, query, msgid=None, ttl=7):
if(ttl <= 0):
return
if(msgid):
header = "{0}&80&{1}&".format(msgid, ttl)
else:
header = self.buildHeader(80, ttl)
message = "{0}{1};".format(header, query)
global connections
for cn in connections:
if(msgid == None or cn != self):
cn.transport.write(message)
def sendQueryHit(self, msgid, query=None, payload=None):
header = "{0}&81&7&".format(msgid)
global msgRoutes
if not isValid(msgid):
return
if payload:
message = "{0}{1};".format(header, payload)
else:
global IP
global serverPort
message = "{0}{1}&{2}&{3};".format(header, serverPort, IP, query)
msgRoutes[msgid][0].transport.write(message)
def handleQuery(self, msgid, ttl, query):
global msgRoutes
if isValid(msgid):
return
msgRoutes[msgid] = (self, time.time())
global directory
if "../" in query:
print "Cannot request files in upper directories"
return
filepath = os.path.join(directory, query)
if os.path.isfile(filepath):
self.sendQueryHit(msgid, query=query)
writeLog("File found: {0}; Sending QueryHit\n".format(query))
else:
self.sendQuery(query, msgid, ttl-1)
writeLog("Forwarding Query: {0} {1}".format(query, msgid))
def handleQueryHit(self, msgid, payload):
global nodeID
if(msgid.startswith(nodeID)):
info = payload.split('&', 2)
port = info[0]
ip = info[1]
query = info[2]
print "Found port, ip, file: ", info
global directory
filepath = os.path.join(directory, query)
if not os.path.isfile(filepath):
printLine("Getting file \"{0}\" from {1}:{2}".format(query, ip, port))
reactor.callInThread(self.getFile, port, ip, query, filepath)
else:
self.sendQueryHit(msgid, payload=payload)
def getFile(self, port, ip, query, filepath):
request = os.path.join(port, query)
url = "http://{0}:{1}".format(ip, request)
fp = open(filepath, "w")
fp.write(urlopen(url).read())
fp.close()
class GnutellaFactory(protocol.ReconnectingClientFactory):
def __init__(self, isInitiator=False):
self.initiator = False
if isInitiator:
self.initiator = True
def buildProtocol(self, addr):
prot = GnutellaProtocol()
if self.initiator:
prot.setInitiator()
return prot
def startedConnecting(self, connector):
self.host = connector.host
self.port = connector.port
writeLog("Trying to connect to {0}:{1}\n".format(self.host, self.port))
# def clientConnectionLost(self, transport, reason):
#reactor.stop()
# print "Disconnected with {0}:{1}".format(self.host, self.port)
def clientConnectionFailed(self, transport, reason):
writeLog("Retrying connection with %s:%s\n" % (transport.host, transport.port))
global connections
numConns = len(connections)
if numConns == 0:
makePeerConnection()
"""
GLOBAL HELPER FUNCTIONS
"""
def makePeerConnection(IP=None, port=None):
global MAX_CONNS
global netData
global connections
cleanPeerList()
numConns = len(connections)
if (numConns < MAX_CONNS and len(netData) > 0):
if numConns == 0 or shouldConnect(numConns):
randNode = netData[random.randint(0, len(netData)-1)]
if (not IP and not port):
IP = randNode[1]
port = randNode[0]
netData.remove(randNode)
reactor.connectTCP(IP, port, GnutellaFactory(True))
def shouldConnect(numConns):
global MIN_CONNS
global UNDER_PROB
global OVER_PROB
prob = random.randint(0, 99)
if (numConns < MIN_CONNS):
if (prob < UNDER_PROB):
return True
elif (prob < OVER_PROB):
return True
return False
def cleanPeerList():
global netData
global connections
for conn in connections:
peer = conn.transport.getPeer()
peer_info = (conn.peerPort, peer.host)
if peer_info in netData:
netData.remove(peer_info)
def readInput():
global connections
print "Requests files with \"GET [filename];\""
pattern = re.compile("GET\s+(.+);$")
while(1):
request = raw_input()
match = pattern.match(request)
if(match):
query = match.group(1)
if (len(connections) > 0):
connections[0].sendQuery(query)
else:
print "No other nodes in network at the moment"
elif(request.startswith("QUIT")):
return
else:
print "Requests must be in the format \"GET [filename];\"\n"
def writeLog(line):
global logFile
logFile = open(logPath, "a")
logFile.write(line)
logFile.close()
def printLine(line):
print line
writeLog("{0}\n".format(line))
def isValid(msgid):
global msgRoutes
global msgTimeout
now = time.time()
if msgid in msgRoutes.keys() and now - msgRoutes[msgid][1] < msgTimeout:
msgRoutes[msgid] = (msgRoutes[msgid][0], now)
return True
return False
"""
MAIN FUNCTION
"""
if __name__=="__main__":
args = sys.argv[1:]
hasIP = False
hasPort = False
#must redeclare variables as globals within function
#otherwise, python recreates a local variable
targetIP = None
targetPort = None
for arg in args:
if(arg == "-i"):
hasIP = True
elif(arg == "-p"):
hasPort = True
elif(hasIP):
targetIP = arg
hasIP = False
elif(hasPort):
targetPort = int(arg)
hasPort = False
else:
directory = arg
if directory:
#Set up directories and log file
if not os.path.isdir(directory):
os.makedirs(directory)
logPath = os.path.join(directory,"output.log")
open(logPath, "w").close() #Create or empty current log file
# logFile = open(os.path.join(directory, "output.log"), "w")
directory = os.path.join(directory, 'files')
if not os.path.exists(directory):
os.makedirs(directory)
print "Run \"tail -c +0 -f {0}\" in another terminal to see output".format(logPath)
printLine("Using directory: {0}".format(directory))
#Set up Twisted clients
if(targetIP and targetPort):
reactor.connectTCP(targetIP, targetPort, GnutellaFactory(initiating))
listener = GnutellaFactory()
usedPort = reactor.listenTCP(port, listener)
host = usedPort.getHost()
IP = host.host
port = host.port
nodeID = "{0}{1:05}".format(getmac(), port)
printLine("IP address: {0}:{1}".format(host.host, host.port))
resource = File(directory)
fileServer = reactor.listenTCP(0, Site(resource))
serverPort = fileServer.getHost().port
printLine("File serving port: {0}".format(serverPort))
printLine("Node ID: {0}".format(nodeID))
reactor.callInThread(readInput)
reactor.run()
logFile.close()
else:
print "Must give a directory path"