1 #! /usr/bin/env python

     2 

     3 # Python implementation of an 'echo' tcp server: echo all data it receives.

     4 #

     5 # This is the simplest possible server, servicing a single request only.

     6 

     7 import sys

     8 from socket import *

     9 

    10 # The standard echo port isn't very useful, it requires root permissions!

    11 # ECHO_PORT = 7

    12 ECHO_PORT = 50000 + 7

    13 BUFSIZE = 1024

    14 

    15 def main():

    16     if len(sys.argv) > 1:

    17         port = int(eval(sys.argv[1]))

    18     else:

    19         port = ECHO_PORT

    20     s = socket(AF_INET, SOCK_STREAM)

    21     s.bind(('', port))

    22     s.listen(1)

    23     conn, (remotehost, remoteport) = s.accept()

    24     print 'connected by', remotehost, remoteport

    25     while 1:

    26         data = conn.recv(BUFSIZE)

    27         if not data:

    28             break

    29         conn.send(data)

    30 

    31 main()