multicast-test.py

#!/usr/bin/env python
import select
import socket
import struct
import sys

TIMEOUT = 10.0

ip = sys.argv[1]
port = int(sys.argv[2])

sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind(('', port))

mreq = struct.pack('4sI', socket.inet_aton(ip), socket.INADDR_ANY)
sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)

ready = select.select([sock], [], [], TIMEOUT)
if ready[0]:
    exit(0)
else:
    exit(1)