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/**
* @file
* Public interface for computing semantic differences in levels.
*
* @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_LEVEL_DIFF_H
#define POLDIFF_LEVEL_DIFF_H
#ifdef __cplusplus
extern "C"
{
#endif
#include <apol/vector.h>
#include <poldiff/poldiff.h>
typedef struct poldiff_level poldiff_level_t;
/**
* Get an array of statistics for the number of differences of each
* form for levels.
*
* @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_level_get_stats(const poldiff_t * diff, size_t stats[5]);
/**
* Get the vector of level differences from the level difference
* summary.
*
* @param diff The policy difference structure associated with the
* level difference summary.
*
* @return A vector of elements of type poldiff_level_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_level_vector(const poldiff_t * diff);
/**
* Obtain a newly allocated string representation of a difference in
* a level.
*
* @param diff The policy difference structure associated with the level.
* @param level The level from which to generate the string.
*
* @return A string representation of level difference; the caller is
* responsible for free()ing this string. On error, return NULL and
* set errno.
*/
extern char *poldiff_level_to_string(const poldiff_t * diff, const void *level);
/**
* Allocate and return a string rendering of a poldiff_level_t,
* suitable for embedding within some other component's to_string
* function (e.g., a user's default level).
*
* @param diff Poldiff object, for error handling.
* @param level Level diff object to render.
*
* @return String rendering of level, or NULL upon error. Caller must
* free() string afterwards.
*/
char *poldiff_level_to_string_brief(const poldiff_t * diff, const poldiff_level_t * level);
/**
* Get the name of the level (i.e., the sensitivity) from a level diff.
*
* @param level The level from which to get the name.
*
* @return Name of the level 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_level_get_name(const poldiff_level_t * level);
/**
* Get the form of difference from a level diff.
*
* @param level The level 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_level_get_form(const void *level);
/**
* Get a vector of unmodified categories from the level. These will
* be sorted in the same order as given by the original policy.
*
* @param level The level diff from which to get the category vector.
*
* @return A vector of category names (type char *) that are assigned to
* the level in the original policy. If no categories were removed the
* size of the returned vector will be 0. The caller must not
* destroy this vector. On error, errno will be set.
*/
extern const apol_vector_t *poldiff_level_get_unmodified_cats(const poldiff_level_t * level);
/**
* Get a vector of categories added to the level. These will be
* sorted in the same order as given by the modified policy. If the
* level was added by the modified policy then this vector will hold
* all of the categories.
*
* @param level The level diff from which to get the categories.
*
* @return A vector of category names (type char *) that are assigned
* to the level in the modified policy. If no categories were added
* the size of the returned vector will be 0. The caller must not
* modify this vector. On error, errno will be set.
*/
extern const apol_vector_t *poldiff_level_get_added_cats(const poldiff_level_t * level);
/**
* Get a vector of categories removed from the level. These will be
* sorted in the same order as given by the original policy. If the
* level was removed by the modified policy then this vector will
* hold all of the categories.
*
* @param level The level diff from which to get the category vector.
*
* @return A vector of category names (type char *) that are assigned to
* the level in the original policy. If no categories were removed the
* size of the returned vector will be 0. The caller must not
* destroy this vector. On error, errno will be set.
*/
extern const apol_vector_t *poldiff_level_get_removed_cats(const poldiff_level_t * level);
#ifdef __cplusplus
}
#endif
#endif /* POLDIFF_LEVEL_DIFF_H */
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