#!/usr/bin/env python
import sys
from socket import *
from select import select

host  = None
port  = sys.argv[1]
flags = AI_PASSIVE

serverSockets = []

for addrinfo in getaddrinfo(host, port, AF_UNSPEC, SOCK_STREAM, 0, flags):
    family, socktype, proto, canonname, sockaddr = addrinfo
    serverSocket = socket(family, socktype, proto)
    if family==AF_INET6:
        serverSocket.setsockopt(IPPROTO_IPV6, IPV6_V6ONLY, 1)
    serverSocket.bind(sockaddr)
    serverSocket.listen(1)
    serverSockets.append(serverSocket)


while True:
    readable, writable, special = select( serverSockets, [], [])
    for readSocket in readable:
        connectionSocket, connectionAddress = readSocket.accept()
	connectionSocket.send("Hello {0}\n".format(connectionAddress).encode("ascii"))
        connectionSocket.close()