import socket

if not hasattr(socket, 'IP_ADD_SOURCE_MEMBERSHIP'):
	setattr(socket, 'IP_ADD_SOURCE_MEMBERSHIP', 39)

group = '239.192.70.40'
port = 40040
bind = '0.0.0.0'
source = '10.50.129.90'

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)

imr = (socket.inet_pton(socket.AF_INET, group) + socket.inet_pton(socket.AF_INET, bind) + socket.inet_pton(socket.AF_INET, source))

s.setsockopt(socket.IPPROTO_IP, socket.SO_REUSEADDR, 1)
s.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_SOURCE_MEMBERSHIP, imr)
s.bind((group,port))

while True:
	msg = s.recv(16384)
	print len(msg)