services.py 文件源码

def join_ipv6_beacon_group(sock, ifindex):
    """Joins the MAAS IPv6 multicast group using the specified UDP socket.

    :param sock: An opened IPv6 UDP socket.
    :param ifindex: The interface index that should join the multicast group.
    """
    # XXX mpontillo 2017-06-21: Twisted doesn't support IPv6 here yet.
    # It would be nice to do this:
    # transport.joinGroup(BEACON_IPV6_MULTICAST)
    ipv6_join_sockopt_args = (
        socket.inet_pton(socket.AF_INET6, BEACON_IPV6_MULTICAST) +
        struct.pack("I", ifindex)
    )
    try:
        sock.setsockopt(
            socket.IPPROTO_IPV6, socket.IPV6_JOIN_GROUP,
            ipv6_join_sockopt_args)
    except OSError:
        # Do this on a best-effort basis. We might get an "Address already in
        # use" error if the group is already joined, or (for whatever reason)
        # it is not possible to join a multicast group using this interface.
        pass