if commandwhile trueshow simple prompt client_socket send("now we receive until we see linefeed (enter keycmd_buffer "while "\nnot in cmd_buffercmd_buffer +client_socket recv( send back the command output response run_command(cmd_buffersend back the response client_socket send(responseour first chunk of code is responsible for determining whether our network tool is set to receive file when it receives connection this can be useful for upload-and-execute exercises or for installing malware and having the malware remove our python callback first we receive the file data in loop to make sure we receive it alland then we simply open file handle and write out the contents of the file the wb flag ensures that we are writing the file with binary mode enabledwhich ensures that uploading and writing binary executable will be successful next we process our execute functionality which calls our previously written run_command function and simply sends the result back across the network our last bit of code handles our command shell it continues to execute commands as we send them in and sends back the output you'll notice that it is scanning for newline character to determine when to process commandwhich makes it netcat-friendly howeverif you are conjuring up python client to speak to itremember to add the newline character