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/**
* @file
*
* Routines to query constraint and validatetrans statements in a policy.
*
* @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 APOL_CONSTRAINT_QUERY_H
#define APOL_CONSTRAINT_QUERY_H
#ifdef __cplusplus
extern "C"
{
#endif
#include "policy.h"
#include "vector.h"
typedef struct apol_constraint_query apol_constraint_query_t;
typedef struct apol_validatetrans_query apol_validatetrans_query_t;
/******************** constraint queries ********************/
/**
* Execute a query against all constraints within the policy.
*
* @param p Policy within which to look up constraints.
* @param c Structure containing parameters for query. If this is
* NULL then return all constraints.
* @param v Reference to a vector of qpol_constraint_t. The vector
* will be allocated by this function. The caller must call
* apol_vector_destroy() afterwards. This will be set to NULL upon no
* results or upon error.
*
* @return 0 on success (including none found), negative on error.
*/
extern int apol_constraint_get_by_query(const apol_policy_t * p, apol_constraint_query_t * c, apol_vector_t ** v);
/**
* Allocate and return a new constraint query structure. All fields
* are initialized, such that running this blank query results in
* returning all constraints within the policy. The caller must call
* apol_constraint_query_destroy() upon the return value afterwards.
*
* @return An initialized constraint query structure, or NULL upon
* error.
*/
extern apol_constraint_query_t *apol_constraint_query_create(void);
/**
* Deallocate all memory associated with the referenced constraint
* query, and then set it to NULL. This function does nothing if the
* query is already NULL.
*
* @param c Reference to a constraint query structure to destroy.
*/
extern void apol_constraint_query_destroy(apol_constraint_query_t ** c);
/**
* Set a constraint query to return only constraints that use object
* classes that match this name. This function duplicates the
* incoming name.
*
* @param p Policy handler, to report errors.
* @param c Constraint query to set.
* @param name Limit query to only classes with this name, or NULL
* to unset this field.
*
* @return 0 on success, negative on error.
*/
extern int apol_constraint_query_set_class(const apol_policy_t * p, apol_constraint_query_t * c, const char *name);
/**
* Set a constraint query to return only constraints that employ
* permissions that match this name. This function duplicates the
* incoming name.
*
* @param p Policy handler, to report errors.
* @param c Constraint query to set.
* @param name Limit query to only permissions with this name, or NULL
* to unset this field.
*
* @return 0 on success, negative on error.
*/
extern int apol_constraint_query_set_perm(const apol_policy_t * p, apol_constraint_query_t * c, const char *name);
/**
* Set a constraint query to use regular expression searching for all
* of its fields. Strings will be treated as regexes instead of
* literals.
*
* @param p Policy handler, to report errors.
* @param c Constraint query to set.
* @param is_regex Non-zero to enable regex searching, 0 to disable.
*
* @return Always 0.
*/
extern int apol_constraint_query_set_regex(const apol_policy_t * p, apol_constraint_query_t * c, int is_regex);
/******************** validatetrans queries ********************/
/**
* Execute a query against all validatetrans statements within the
* policy.
*
* @param p Policy within which to look up validatetrans statements.
* @param vr Structure containing parameters for query. If this is
* NULL then return all validatetrans statements.
* @param v Reference to a vector of qpol_validatetrans_t. The vector
* will be allocated by this function. The caller must call
* apol_vector_destroy() afterwards. This will be set to NULL upon no
* results or upon error.
*
* @return 0 on success (including none found), negative on error.
*/
extern int apol_validatetrans_get_by_query(const apol_policy_t * p, apol_validatetrans_query_t * vt, apol_vector_t ** v);
/**
* Allocate and return a new validatetrans query structure. All
* fields are initialized, such that running this blank query results
* in returning all validatetrans within the policy. The caller must
* call apol_validatetrans_query_destroy() upon the return value
* afterwards.
*
* @return An initialized validatetrans query structure, or NULL upon
* error.
*/
extern apol_validatetrans_query_t *apol_validatetrans_query_create(void);
/**
* Deallocate all memory associated with the referenced validatetrans
* query, and then set it to NULL. This function does nothing if the
* query is already NULL.
*
* @param vt Reference to a validatetrans query structure to destroy.
*/
extern void apol_validatetrans_query_destroy(apol_validatetrans_query_t ** vt);
/**
* Set a validatetrans query to return only validatetrans that use
* object classes that match this name. This function duplicates the
* incoming name.
*
* @param p Policy handler, to report errors.
* @param vt Validatetrans query to set.
* @param name Limit query to only classes with this name, or NULL
* to unset this field.
*
* @return 0 on success, negative on error.
*/
extern int apol_validatetrans_query_set_class(const apol_policy_t * p, apol_validatetrans_query_t * vt, const char *name);
/**
* Set a validatetrans query to use regular expression searching for
* all of its fields. Strings will be treated as regexes instead of
* literals.
*
* @param p Policy handler, to report errors.
* @param vt Validatetrans query to set.
* @param is_regex Non-zero to enable regex searching, 0 to disable.
*
* @return Always 0.
*/
extern int apol_validatetrans_query_set_regex(const apol_policy_t * p, apol_validatetrans_query_t * vt, int is_regex);
#ifdef __cplusplus
}
#endif
#endif
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