multicast-unicast.py

#!/usr/bin/env python

import socket
import struct
import sys

src_ip = sys.argv[1]
src_port = int(sys.argv[2])
dst_addr = sys.argv[3]
dst_port = int(sys.argv[4])

src = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
src.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
src.bind(('', src_port))

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


dst = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
dst.connect( (dst_addr, dst_port) )

while True:
    data = src.recv(65535)
    dst.send(data)