tryoptsargs getopt getopt(sys argv[ :],"hle: : :cu:"["help","listen","execute","target","port","command","upload"]except getopt getopterror as errprint str(errusage(for , in optsif in ("- ","--help")usage(elif in ("- ","--listen")listen true elif in ("- ""--execute")execute elif in ("- ""--commandshell")command true elif in ("- ""--upload")upload_destination elif in ("- ""--target")target elif in ("- ""--port")port int(aelseassert false,"unhandled optionare we going to listen or just send data from stdinif not listen and len(targetand port read in the buffer from the commandline this will blockso send ctrl- if not sending input to stdin buffer sys stdin read(send data off client_sender(bufferwe are going to listen and potentially upload thingsexecute commandsand drop shell back depending on our command line options above if listenserver_loop(main(we begin by reading in all of the command-line options and setting the necessary variables depending on the options we detect if any of the command-line parameters don' match our criteriawe print out useful usage information in the next block of code we are trying to mimic netcat to read data from stdin and send it across the network as notedif you plan on sending data interactivelyyou need to send ctrl- to bypass the stdin read the final piece is where we detect that we are to set up listening socket and process further commands (upload fileexecute commandstart command shellnow let' start putting in the plumbing for some of these featuresstarting with our client code add the following code above our main function def client_sender(buffer)client socket socket(socket af_inetsocket sock_streamtryconnect to our target host client connect((target,port)