/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */

/*

 * Copyright 2016 by the Massachusetts Institute of Technology.

 * All Rights Reserved.

 *

 * Export of this software from the United States of America may

 * require a specific license from the United States Government.

 * It is the responsibility of any person or organization contemplating

 * export to obtain such a license before exporting.

 *

 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and

 * distribute this software and its documentation for any purpose and

 * without fee is hereby granted, provided that the above copyright

 * notice appear in all copies and that both that copyright notice and

 * this permission notice appear in supporting documentation, and that

 * the name of M.I.T. not be used in advertising or publicity pertaining

 * to distribution of the software without specific, written prior

 * permission.  Furthermore if you modify this software you must label

 * your software as modified software and not distribute it in such a

 * fashion that it might be confused with the original M.I.T. software.

 * M.I.T. makes no representations about the suitability of

 * this software for any purpose.  It is provided "as is" without express

 * or implied warranty.

 */

#ifndef UDPPKTINFO_H

#define UDPPKTINFO_H

#include "k5-int.h"

/*

 * This holds whatever additional information might be needed to

 * properly send back to the client from the correct local address.

 *

 * In this case, we only need one datum so far: On macOS, the

 * kernel doesn't seem to like sending from link-local addresses

 * unless we specify the correct interface.

 */

typedef union aux_addressing_info

{

    int ipv6_ifindex;

} aux_addressing_info;

krb5_error_code

set_pktinfo(int sock, int family);

krb5_error_code

recv_from_to(int sock, void *buf, size_t len, int flags,

             struct sockaddr *from, socklen_t *fromlen,

             struct sockaddr *to, socklen_t *tolen,

             aux_addressing_info *auxaddr);

krb5_error_code

send_to_from(int sock, void *buf, size_t len, int flags,

             const struct sockaddr *to, socklen_t tolen, struct sockaddr *from,

             socklen_t fromlen, aux_addressing_info *auxaddr);

#endif /* UDPPKTINFO_H */