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/**
* @file
* Public interface for computing semantic differences in range
* transition rules.
*
* @author Jeremy A. Mowery jmowery@tresys.com
* @author Jason Tang jtang@tresys.com
*
* Copyright (C) 2007 Tresys Technology, LLC
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef POLDIFF_RANGETRANS_DIFF_H
#define POLDIFF_RANGETRANS_DIFF_H
#ifdef __cplusplus
extern "C"
{
#endif
#include <apol/mls-query.h>
#include <apol/vector.h>
#include <poldiff/poldiff.h>
typedef struct poldiff_range_trans poldiff_range_trans_t;
/**
* Get an array of statistics for the number of differences of each
* form for range transition rules.
*
* @param diff The policy difference structure from which to get the
* stats.
* @param stats Array into which to write the numbers (array must be
* pre-allocated). The order of the values written to the array is
* as follows: number of items of form POLDIFF_FORM_ADDED, number of
* POLDIFF_FORM_REMOVED, number of POLDIFF_FORM_MODIFIED, number of
* POLDIFF_FORM_ADD_TYPE, and number of POLDIFF_FORM_REMOVE_TYPE.
*/
extern void poldiff_range_trans_get_stats(const poldiff_t * diff, size_t stats[5]);
/**
* Get the vector of range transition differences from the policy
* difference structure.
*
* @param diff The policy difference structure from which to get the
* differences.
*
* @return A vector of elements of type poldiff_range_trans_t, or
* NULL on error. The caller should <b>not</b> destroy the vector
* returned. If the call fails, errno will be set.
*/
extern const apol_vector_t *poldiff_get_range_trans_vector(const poldiff_t * diff);
/**
* Obtain a newly allocated string representation of a difference in
* a range transition rule.
*
* @param diff The policy difference structure associated with the rule.
* @param range_trans The range transition diff from which to
* generate the string.
*
* @return A string representation of the rule difference; the caller is
* responsible for free()ing this string. On error, return NULL and
* set errno.
*/
extern char *poldiff_range_trans_to_string(const poldiff_t * diff, const void *range_trans);
/**
* Get the name of the source type from a range transition diff.
*
* @param range_trans The rule from which to get the source type.
*
* @return Name of the source type on success and NULL on failure; if the
* call fails, errno will be set. The caller should not free the
* returned string.
*/
extern const char *poldiff_range_trans_get_source_type(const poldiff_range_trans_t * range_trans);
/**
* Get the name of the target type from a range transition diff.
*
* @param range_trans The rule from which to get the target type.
*
* @return Name of the target type on success and NULL on failure; if
* the call fails, errno will be set. The caller should not free the
* returned string.
*/
extern const char *poldiff_range_trans_get_target_type(const poldiff_range_trans_t * range_trans);
/**
* Get the name of the target object class from a range transition
* diff.
*
* @param range_trans The rule from which to get the target class.
*
* @return Name of the target class on success and NULL on failure;
* if the call fails, errno will be set. The caller should not free
* the returned string.
*/
extern const char *poldiff_range_trans_get_target_class(const poldiff_range_trans_t * range_trans);
/**
* Get the change in target range from a range transition diff.
*
* @param range_trans The rule from which to get the target range.
*
* @return Rule's target range on success, or NULL upon error or if
* there is no difference in range. Do not modify the returned value.
*/
extern const poldiff_range_t *poldiff_range_trans_get_range(const poldiff_range_trans_t * range_trans);
/**
* Get the form of difference from a range transition diff.
*
* @param range_trans The range transition rule from which to get the
* difference form.
*
* @return The form of difference (one of POLDIFF_FORM_*) or
* POLDIFF_FORM_NONE on error. If the call fails, errno will be set.
*/
extern poldiff_form_e poldiff_range_trans_get_form(const void *range_trans);
#ifdef __cplusplus
}
#endif
#endif /* POLDIFF_RANGETRANS_DIFF_H */
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