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/**
* @file
* Public interface for computing semantic differences in classes
* and commons.
*
* @author Jeremy A. Mowery jmowery@tresys.com
* @author Jason Tang jtang@tresys.com
*
* Copyright (C) 2006-2007 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_CLASS_DIFF_H
#define POLDIFF_CLASS_DIFF_H
#ifdef __cplusplus
extern "C"
{
#endif
#include <apol/vector.h>
#include <poldiff/poldiff.h>
/******************** object classes ********************/
typedef struct poldiff_class poldiff_class_t;
/**
* Get an array of statistics for the number of differences of each
* form for object classes.
*
* @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_class_get_stats(const poldiff_t * diff, size_t stats[5]);
/**
* Get the vector of class differences from the class difference
* summary.
*
* @param diff The policy difference structure associated with the
* class difference summary.
*
* @return A vector of elements of type poldiff_class_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_class_vector(const poldiff_t * diff);
/**
* Obtain a newly allocated string representation of a difference in
* an object class.
*
* @param diff The policy difference structure associated with the class.
* @param cls The class from which to generate the string.
*
* @return A string representation of class difference; the caller is
* responsible for free()ing this string. On error, return NULL and
* set errno.
*/
extern char *poldiff_class_to_string(const poldiff_t * diff, const void *cls);
/**
* Get the name of the class from a class diff.
*
* @param cls The class from which to get the name.
*
* @return Name of the 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_class_get_name(const poldiff_class_t * cls);
/**
* Get the form of difference from a class diff.
*
* @param cls The class 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_class_get_form(const void *cls);
/**
* Get a vector of permissions added to the class.
*
* @param cls The class diff from which to get the permission vector.
*
* @return A vector of permission names (type char *) that are
* assigned to the class in the modified policy. If no permissions
* were added 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_class_get_added_perms(const poldiff_class_t * cls);
/**
* Get a vector of permissions removed from the class.
*
* @param cls The class diff from which to get the permission vector.
*
* @return A vector of permission names (type char *) that are
* assigned to the class in the original policy. If no permissions
* 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_class_get_removed_perms(const poldiff_class_t * cls);
/******************** common classes ********************/
typedef struct poldiff_common poldiff_common_t;
/**
* Get an array of statistics for the number of differences of each
* form for common classes.
*
* @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_common_get_stats(const poldiff_t * diff, size_t stats[5]);
/**
* Get the vector of commons differences from the commons difference
* summary.
*
* @param diff The policy difference structure associated with the
* commons difference summary.
*
* @return A vector of elements of type poldiff_common_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_common_vector(const poldiff_t * diff);
/**
* Obtain a newly allocated string representation of a difference in
* a common class.
*
* @param diff The policy difference structure associated with the
* common.
* @param common The common from which to generate the string.
*
* @return A string representation of common difference; the caller
* is responsible for free()ing this string. On error, return NULL
* and set errno.
*/
extern char *poldiff_common_to_string(const poldiff_t * diff, const void *common);
/**
* Get the name of the common from a common diff.
*
* @param common The common from which to get the name.
*
* @return Name of the common 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_common_get_name(const poldiff_common_t * common);
/**
* Get the form of difference from a common diff.
*
* @param common The common 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_common_get_form(const void *common);
/**
* Get a vector of permissions added to the common.
*
* @param common The common diff from which to get the permission
* vector.
*
* @return A vector of permission names (type char *) that are
* assigned to the common in the modified policy. If no permissions
* were added 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_common_get_added_perms(const poldiff_common_t * common);
/**
* Get a vector of permissions removed from the common.
*
* @param common The common diff from which to get the permission
* vector.
*
* @return A vector of permission names (type char *) that are
* assigned to the common in the original policy. If no permissions
* 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_common_get_removed_perms(const poldiff_common_t * common);
#ifdef __cplusplus
}
#endif
#endif /* POLDIFF_CLASS_DIFF_H */
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