31 lines · 739 B · Python
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#! /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 sysfrom socket import * # The standard echo port isn't very useful, it requires root permissions!# ECHO_PORT = 7ECHO_PORT = 50000 + 7BUFSIZE = 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()