# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.


"""
I am a support module for making SOCKSv4 servers with twistd.
"""
from __future__ import print_function

from twisted.protocols import socks
from twisted.python import usage
from twisted.application import internet


class Options(usage.Options):
    synopsis = "[-i <interface>] [-p <port>] [-l <file>]"
    optParameters = [["interface", "i", "127.0.0.1", "local interface to which we listen"],
                  ["port", "p", 1080, "Port on which to listen"],
                  ["log", "l", None, "file to log connection data to"]]

    compData = usage.Completions(
        optActions={"log": usage.CompleteFiles("*.log"),
                    "interface": usage.CompleteNetInterfaces()}
        )

    longdesc = "Makes a SOCKSv4 server."

def makeService(config):
    if config["interface"] != "127.0.0.1":
        print()
        print("WARNING:")
        print("  You have chosen to listen on a non-local interface.")
        print("  This may allow intruders to access your local network")
        print("  if you run this on a firewall.")
        print()
    t = socks.SOCKSv4Factory(config['log'])
    portno = int(config['port'])
    return internet.TCPServer(portno, t, interface=config['interface'])