/*-
 * Copyright (c) 2005-2008 Apple Inc.
 * Copyright (c) 2005 SPARTA, Inc.
 * All rights reserved.
 *
 * This code was developed in part by Robert N. M. Watson, Senior Principal
 * Scientist, SPARTA, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $P4: //depot/projects/trustedbsd/openbsm/sys/bsm/audit_internal.h#5 $
 */

#ifndef _AUDIT_INTERNAL_H
#define _AUDIT_INTERNAL_H

#if defined(__linux__) && !defined(__unused)
#define __unused
#endif

#include <stddef.h>
#include <sys/queue.h>
#include <sys/types.h>

/*
 * audit_internal.h contains private interfaces that are shared by user space
 * and the kernel for the purposes of assembling audit records.  Applications
 * should not include this file or use the APIs found within, or it may be
 * broken with future releases of OpenBSM, which may delete, modify, or
 * otherwise break these interfaces or the assumptions they rely on.
 */
struct au_token {
	u_char                  *t_data;
	size_t                   len;
	TAILQ_ENTRY(au_token)    tokens;
};

struct au_record {
	char                     used;          /* Record currently in use? */
	int                      desc;          /* Descriptor for record. */
	TAILQ_HEAD(, au_token)   token_q;       /* Queue of BSM tokens. */
	u_char                  *data;
	size_t                   len;
	LIST_ENTRY(au_record)    au_rec_q;
};
typedef struct au_record        au_record_t;


/*
 * We could determined the header and trailer sizes by defining appropriate
 * structures.  We hold off that approach until we have a consistent way of
 * using structures for all tokens.  This is not straightforward since these
 * token structures may contain pointers of whose contents we do not know the
 * size (e.g text tokens).
 */
#define AUDIT_HEADER_EX_SIZE(a) ((a)->ai_termid.at_type+18+sizeof(u_int32_t))
#define AUDIT_HEADER_SIZE       18
#define MAX_AUDIT_HEADER_SIZE   (5*sizeof(u_int32_t)+18)
#define AUDIT_TRAILER_SIZE      7
#define MAX_AUDIT_IDENTITY_SIZE 179

/*
 * BSM token streams store fields in big endian byte order, so as to be
 * portable; when encoding and decoding, we must convert byte orders for
 * typed values.
 */
#define ADD_U_CHAR(loc, val)                                            \
	do {                                                            \
	        *(loc) = (val);                                         \
	        (loc) += sizeof(u_char);                                \
	} while(0)


#define ADD_U_INT16(loc, val)                                           \
	do {                                                            \
	        be16enc((loc), (val));                                  \
	        (loc) += sizeof(u_int16_t);                             \
	} while(0)

#define ADD_U_INT32(loc, val)                                           \
	do {                                                            \
	        be32enc((loc), (val));                                  \
	        (loc) += sizeof(u_int32_t);                             \
	} while(0)

#define ADD_U_INT64(loc, val)                                           \
	do {                                                            \
	        be64enc((loc), (val));                                  \
	        (loc) += sizeof(u_int64_t);                             \
	} while(0)

#define ADD_MEM(loc, data, size)                                        \
	do {                                                            \
	        memcpy((loc), (data), (size));                          \
	        (loc) += size;                                          \
	} while(0)

#define ADD_STRING(loc, data, size)     ADD_MEM(loc, data, size)

#endif /* !_AUDIT_INTERNAL_H_ */
