nc.py

#!/usr/bin/env python

import SocketServer
import time
import threading
import random

class Service(SocketServer.BaseRequestHandler):
	def handle( self ):
		
		print "Someone connected!"

		handle = open('/dev/urandom')

		offset = random.randint( 60, 120 ) 
		starting_time = int(time.time())  

		while ( True ):
			
			if ( int(time.time()) != starting_time + offset ):
				self.send( handle.read(1), newline = False )
			else:
				flag = 'OldSchoolCTF{Look_4t_th3_cR4p}'
				self.send( flag, newline = False )

				starting_time = int(time.time())
				offset = random.randint( 60, 120 ) 

	def send( self, string, newline = True ):
		if newline: string = string + "\n"
		self.request.sendall(string)  
	def receive( self, prompt = " > " ):
		self.send( prompt, newline = False )
		return self.request.recv( 4096 ).strip() 


class ThreadedService( SocketServer.ThreadingMixIn, SocketServer.TCPServer, SocketServer.DatagramRequestHandler ):
	pass

def main():

	port = 6667       
	host = '0.0.0.0'  

	service = Service 
	
	server = ThreadedService( ( host, port ), service )
	server.allow_reuse_address = True

	server_thread = threading.Thread( target = server.serve_forever )

	server_thread.daemon = True
	server_thread.start()

	print "Server started on port", port

	while ( True ): time.sleep(60)


if ( __name__ == "__main__" ):
	main()