#! /usr/bin/env python

# Python implementation of an 'echo' tcp server: echo all data it receives.
#
# This is the simplest possible server, servicing a single request only.

import sys
from socket import *

# The standard echo port isn't very useful, it requires root permissions!
# ECHO_PORT = 7
ECHO_PORT = 50000 + 7
BUFSIZE = 1024

def main():
	if len(sys.argv) > 1:
		port = int(eval(sys.argv[1]))
	else:
		port = ECHO_PORT
	s = socket(AF_INET, SOCK_STREAM)
	s.bind('', port)
	s.listen(1)
	conn, (remotehost, remoteport) = s.accept()
	print 'connected by', remotehost, remoteport
	while 1:
		data = conn.recv(BUFSIZE)
		if not data:
			break
		conn.send(data)

main()