SilcBool silc_packet_get_ids(SilcPacketStream stream,
                                 SilcBool *src_id_set, SilcID *src_id,
                                 SilcBool *dst_id_set, SilcID *dst_id);

    Returns source and destination IDs from the packet stream.  The
    `src_id_set' is set to TRUE if the source ID was returned.  The
    `dst_id_set' is set to TRUE if the destination ID was returned.