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/**
* @file
* Public Interface for querying genfscons and fs_uses of 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_FSCON_QUERY_H
#define APOL_FSCON_QUERY_H
#ifdef __cplusplus
extern "C"
{
#endif
#include "policy.h"
#include "vector.h"
#include "context-query.h"
#include <string.h>
#include <qpol/policy.h>
typedef struct apol_genfscon_query apol_genfscon_query_t;
typedef struct apol_fs_use_query apol_fs_use_query_t;
/******************** genfscon queries ********************/
/**
* Execute a query against all genfscons within the policy. The
* returned genfscons will be unordered.
*
* @param p Policy within which to look up genfscons.
* @param g Structure containing parameters for query. If this is
* NULL then return all genfscons.
* @param v Reference to a vector of qpol_genfscon_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_genfscon_get_by_query(const apol_policy_t * p, const apol_genfscon_query_t * g, apol_vector_t ** v);
/**
* Allocate and return a new genfscon query structure. All fields are
* initialized, such that running this blank query results in
* returning all genfscons within the policy. The caller must call
* apol_genfscon_query_destroy() upon the return value afterwards.
*
* @return An initialized genfscon query structure, or NULL upon
* error.
*/
extern apol_genfscon_query_t *apol_genfscon_query_create(void);
/**
* Deallocate all memory associated with the referenced genfscon
* query, and then set it to NULL. This function does nothing if the
* query is already NULL.
*
* @param g Reference to a genfscon query structure to destroy.
*/
extern void apol_genfscon_query_destroy(apol_genfscon_query_t ** g);
/**
* Set a genfscon query to return only genfscons that act upon this
* filesystem.
*
* @param p Policy handler, to report errors.
* @param g Genfscon query to set.
* @param fs Limit query to only genfscons with this filesystem, or
* NULL to unset this field.
*
* @return 0 on success, negative on error.
*/
extern int apol_genfscon_query_set_filesystem(const apol_policy_t * p, apol_genfscon_query_t * g, const char *fs);
/**
* Set a genfscon query to return only genfscons that act upon this
* relative path. If the path includes a trailing slash, the search
* will ingore that slash.
*
* @param p Policy handler, to report errors.
* @param g Genfscon query to set.
* @param path Limit query to only genfscons with this path, or NULL
* to unset this field.
*
* @return 0 on success, negative on error.
*/
extern int apol_genfscon_query_set_path(const apol_policy_t * p, apol_genfscon_query_t * g, const char *path);
/**
* Set a genfscon query to return only genfscons that act upon this
* object class.
*
* @param p Policy handler, to report errors.
* @param g Genfscon query to set.
* @param class Limit query to only genfscons with this object class,
* which must be one of QPOL_CLASS_BLK_FILE, QPOL_CLASS_CHR_FILE,
* etc., or negative to unset this field.
*
* @return 0 on success, negative on error.
*/
extern int apol_genfscon_query_set_objclass(const apol_policy_t * p, apol_genfscon_query_t * g, int objclass);
/**
* Set a genfscon query to return only genfscons matching a context.
* This function takes ownership of the context, such that the caller
* must not modify nor destroy it afterwards.
*
* @param p Policy handler, to report errors.
* @param g Genfscon query to set.
* @param context Limit query to only genfscons matching this context,
* or NULL to unset this field.
* @param range_match Specifies how to match the MLS range within the
* context. This must be one of APOL_QUERY_SUB, APOL_QUERY_SUPER, or
* APOL_QUERY_EXACT. This parameter is ignored if context is NULL.
*
* @return Always returns 0.
*/
extern int apol_genfscon_query_set_context(const apol_policy_t * p,
apol_genfscon_query_t * g, apol_context_t * context, unsigned int range_match);
/**
* Creates a string containing the textual representation of
* a genfscon type.
* @param p Reference to a policy.
* @param genfscon Reference to the genfscon statement to be rendered.
*
* @return A newly allocated string on success, caller must free;
* NULL on error.
*/
extern char *apol_genfscon_render(const apol_policy_t * p, const qpol_genfscon_t * genfscon);
/******************** fs_use queries ********************/
/**
* Execute a query against all fs_uses within the policy. The
* returned fs_use statements will be unordered.
*
* @param p Policy within which to look up fs_use statements.
* @param f Structure containing parameters for query. If this is
* NULL then return all fs_use statements.
* @param v Reference to a vector of qpol_fs_use_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_fs_use_get_by_query(const apol_policy_t * p, const apol_fs_use_query_t * f, apol_vector_t ** v);
/**
* Allocate and return a new fs_use query structure. All fields are
* initialized, such that running this blank query results in
* returning all fs_use statements within the policy. The caller must
* call apol_fs_use_query_destroy() upon the return value afterwards.
*
* @return An initialized fs_use query structure, or NULL upon error.
*/
extern apol_fs_use_query_t *apol_fs_use_query_create(void);
/**
* Deallocate all memory associated with the referenced fs_use query,
* and then set it to NULL. This function does nothing if the query
* is already NULL.
*
* @param f Reference to a fs_use query structure to destroy.
*/
extern void apol_fs_use_query_destroy(apol_fs_use_query_t ** f);
/**
* Set a fs_use query to return only fs_use statements that act upon
* this filesystem.
*
* @param p Policy handler, to report errors.
* @param f fs_use query to set.
* @param fs Limit query to only fs_use statements with this
* filesystem, or NULL to unset this field.
*
* @return 0 on success, negative on error.
*/
extern int apol_fs_use_query_set_filesystem(const apol_policy_t * p, apol_fs_use_query_t * f, const char *fs);
/**
* Set a fs_use query to return only fs_use statements with this
* behavior.
*
* @param p Policy handler, to report errors.
* @param f fs_use query to set.
* @param behavior Limit query to only fs_use statements with this
* object class, which must be one of QPOL_FS_USE_XATTR,
* QPOL_FS_USE_TRANS, etc., or negative to unset this field.
*
* @return 0 on success, negative on error.
*/
extern int apol_fs_use_query_set_behavior(const apol_policy_t * p, apol_fs_use_query_t * f, int behavior);
/**
* Set a fs_use query to return only fs_use statements matching a
* context. This function takes ownership of the context, such that
* the caller must not modify nor destroy it afterwards. Note that if
* a context is set, then the resulting query will never return
* fs_use_psid statements.
*
* @param p Policy handler, to report errors.
* @param f fs_use query to set.
* @param context Limit query to only fs_use statements matching this
* context, or NULL to unset this field.
* @param range_match Specifies how to match the MLS range within the
* context. This must be one of APOL_QUERY_SUB, APOL_QUERY_SUPER, or
* APOL_QUERY_EXACT. This parameter is ignored if context is NULL.
*
* @return Always returns 0.
*/
extern int apol_fs_use_query_set_context(const apol_policy_t * p,
apol_fs_use_query_t * f, apol_context_t * context, unsigned int range_match);
/**
* Creates a string containing the textual representation of
* a fs_use type.
* @param p Reference to a policy.
* @param fsuse Reference to the fs_use statement to be rendered.
*
* @return A newly allocated string on success, caller must free;
* NULL on error.
*/
extern char *apol_fs_use_render(const apol_policy_t * p, const qpol_fs_use_t * fsuse);
#ifdef __cplusplus
}
#endif
#endif /* APOL_FSCON_QUERY_H */
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