Netcat implementation in Python

Question

I found this and am using it as my base, but it wasn\'t working right out of the box. My goal is also to treat it as a package instead of a command line utility, so my code

Answer 1

The following is a working implementation on python3:

import socket

def netcat(host, port, content):
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect((host, int(port)))
    s.sendall(content.encode())
    s.shutdown(socket.SHUT_WR)
    while True:
        data = s.recv(4096)
        if not data:
            break
        print(repr(data))
    s.close()

It can be used to send "content" to a "host" on "port" (which all might be entered as sting).

Regards

Answer 2

Does it work if you just use nc?

I think you should try something a little simpler:

import socket

def netcat(hostname, port, content):
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect((hostname, port))
    s.sendall(content)
    s.shutdown(socket.SHUT_WR)
    while 1:
        data = s.recv(1024)
        if data == "":
            break
        print "Received:", repr(data)
    print "Connection closed."
    s.close()

I added the shutdown call because maybe your device is waiting for you to say you're done sending data. (That would be a little weird, but it's possible.)

Answer 3

if you don't mind scrapping that code altogether, you might like to look at scapy -- it's basically the swiss army knife of packet tools in python. take a look at the interactive tutorial to see if it fits your needs.

if you'd like something higher-level than packets twisted is the go-to library for networking in python... unfortunately the learning curve is a tad steep.