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/**
* @file
* Defines the public interface for searching and iterating over booleans.
*
* @author Kevin Carr kcarr@tresys.com
* @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 QPOL_BOOL_QUERY_H
#define QPOL_BOOL_QUERY_H
#ifdef __cplusplus
extern "C"
{
#endif
#include <stddef.h>
#include <stdint.h>
#include <qpol/policy.h>
#include <qpol/iterator.h>
typedef struct qpol_bool qpol_bool_t;
/**
* Get the datum for a conditional boolean by name.
* @param policy The policy database from which to retrieve the boolean.
* @param name The name of the boolean; searching is case sensitive.
* @param datum Pointer to set to the boolean's datum entry in the policy.
* This memory should not be freed by the user.
* @return Returns 0 on success and < 0 on failure; if the call fails,
* errno will be set and *datum will be NULL.
*/
extern int qpol_policy_get_bool_by_name(const qpol_policy_t * policy, const char *name, qpol_bool_t ** datum);
/**
* Get an iterator for conditional booleans in the policy.
* @param policy The policy database from which to create the iterator.
* @param iter Iterator of type qpol_bool_t* returned;
* the user is responsible for calling qpol_iterator_destroy to
* free memory used. It is also important to note that an iterator
* is only valid as long as the policy is unchanged.
* @return Returns 0 on success and < 0 on failure; if the call fails,
* errno will be set and *iter will be NULL.
*/
extern int qpol_policy_get_bool_iter(const qpol_policy_t * policy, qpol_iterator_t ** iter);
/**
* Get the integer value associated with a boolean. Values range from 1 to
* the number of conditional booleans declared in the policy.
* @param policy The policy with which the boolean is associated.
* @param datum Boolean datum from which to get the value. Must be non-NULL.
* @param value Pointer to integer be set to value. Must be non-NULL.
* @return Returns 0 on success and < 0 on failure; if the call fails,
* errno will be set and *value will be 0.
*/
extern int qpol_bool_get_value(const qpol_policy_t * policy, const qpol_bool_t * datum, uint32_t * value);
/**
* Get the state of a boolean.
* @param policy The policy with which the boolean is associated.
* @param datum Boolean datum from which to get the state. Must be non-NULL.
* @param state Pointer to the integer to be set to the boolean's state.
* Must be non-NULL.
* @return Returns 0 on success and < 0 on failure; if the call fails,
* errno will be set and *state will set to 0 (false).
*/
extern int qpol_bool_get_state(const qpol_policy_t * policy, const qpol_bool_t * datum, int *state);
/**
* Set the state of a boolean and update the state of all conditionals
* using the boolean.
* @param policy The policy with which the boolean is associated.
* The state of the policy is changed by this function.
* @param datum Boolean datum for which to set the state. Must be non-NULL.
* @param state Value to which to set the state of the boolean.
* @return Returns 0 on success and < 0 on failure; if the call fails,
* errno will be set.
*/
extern int qpol_bool_set_state(qpol_policy_t * policy, qpol_bool_t * datum, int state);
/**
* Set the state of a boolean but do not update the state of all conditionals
* using the boolean. The caller is responsible for calling
* qpol_policy_reevaluate_conds() at a later time to maintain a consistent
* state of conditional expressions.
* @param policy The policy with which the boolean is associated.
* The state of the policy is changed by this function.
* @param datum Boolean datum for which to set the state. Must be non-NULL.
* @param state Value to which to set the state of the boolean.
* @return Returns 0 on success and < 0 on failure; if the call fails,
* errno will be set.
*/
extern int qpol_bool_set_state_no_eval(qpol_policy_t * policy, qpol_bool_t * datum, int state);
/**
* Get the name which identifies a boolean from its datum.
* @param policy The policy with which the boolean is associated.
* @param datum Boolean datum for which to get the name. Must be non-NULL.
* @param name Pointer to the string in which to store the name.
* Must be non-NULL. The caller should not free the string.
* @return Returns 0 on success and < 0 on failure; if the call fails,
* errno will be set and *name will be NULL.
*/
extern int qpol_bool_get_name(const qpol_policy_t * policy, const qpol_bool_t * datum, const char **name);
#ifdef __cplusplus
}
#endif
#endif /* QPOL_BOOL_QUERY_H */
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