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+/**
+ * @file
+ *
+ * Routines to query (role) allow and role_transition rules of a
+ * policy. This does not include access vector's allow rules, which
+ * are found in avrule-query.h.
+ *
+ * @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_RBACRULE_QUERY_H
+#define APOL_RBACRULE_QUERY_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include "policy.h"
+#include "vector.h"
+#include <qpol/policy.h>
+
+ typedef struct apol_role_allow_query apol_role_allow_query_t;
+ typedef struct apol_role_trans_query apol_role_trans_query_t;
+
+/******************** (role) allow queries ********************/
+
+/**
+ * Execute a query against all (role) allow rules within the policy.
+ *
+ * @param p Policy within which to look up allow rules.
+ * @param r Structure containing parameters for query. If this is
+ * NULL then return all allow rules.
+ * @param v Reference to a vector of qpol_role_allow_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_role_allow_get_by_query(const apol_policy_t * p, const apol_role_allow_query_t * r, apol_vector_t ** v);
+
+/**
+ * Allocate and return a new role allow query structure. All fields
+ * are initialized, such that running this blank query results in
+ * returning all (role) allows within the policy. The caller must
+ * call apol_role_allow_query_destroy() upon the return value
+ * afterwards.
+ *
+ * @return An initialized role allow query structure, or NULL upon
+ * error.
+ */
+ extern apol_role_allow_query_t *apol_role_allow_query_create(void);
+
+/**
+ * Deallocate all memory associated with the referenced role allow
+ * query, and then set it to NULL. This function does nothing if the
+ * query is already NULL.
+ *
+ * @param r Reference to a role allow query structure to destroy.
+ */
+ extern void apol_role_allow_query_destroy(apol_role_allow_query_t ** r);
+
+/**
+ * Set a role allow query to return rules with a particular source
+ * role.
+ *
+ * @param p Policy handler, to report errors.
+ * @param r Role allow query to set.
+ * @param role Limit query to rules with this role as their source, or
+ * NULL to unset this field.
+ *
+ * @return 0 on success, negative on error.
+ */
+ extern int apol_role_allow_query_set_source(const apol_policy_t * p, apol_role_allow_query_t * r, const char *role);
+
+/**
+ * Set a role allow query to return rules with a particular target
+ * role. This field is ignored if
+ * apol_role_allow_query_set_source_any() is set to non-zero.
+ *
+ * @param p Policy handler, to report errors.
+ * @param r Role allow query to set.
+ * @param role Limit query to rules with this role as their target, or
+ * NULL to unset this field.
+ *
+ * @return 0 on success, negative on error.
+ */
+ extern int apol_role_allow_query_set_target(const apol_policy_t * p, apol_role_allow_query_t * r, const char *role);
+
+/**
+ * Set a role allow query to treat the source role as any. That is,
+ * use the same symbol for either source or target of a (role) allow
+ * rule. This flag does nothing if the source role is not set.
+ *
+ * @param p Policy handler, to report errors.
+ * @param r Role allow query to set.
+ * @param is_any Non-zero to use source symbol for any field, 0 to
+ * keep source as only source.
+ *
+ * @return Always 0.
+ */
+ extern int apol_role_allow_query_set_source_any(const apol_policy_t * p, apol_role_allow_query_t * r, int is_any);
+
+/**
+ * Set a role allow query to use regular expression searching for
+ * source and target fields. Strings will be treated as regexes
+ * instead of literals.
+ *
+ * @param p Policy handler, to report errors.
+ * @param r Role allow query to set.
+ * @param is_regex Non-zero to enable regex searching, 0 to disable.
+ *
+ * @return Always 0.
+ */
+ extern int apol_role_allow_query_set_regex(const apol_policy_t * p, apol_role_allow_query_t * r, int is_regex);
+
+/**
+ * Render a role allow rule to a string.
+ *
+ * @param policy Policy handler, to report errors.
+ * @param rule The rule to render.
+ *
+ * @return a newly malloc()'d string representation of the rule, or NULL on
+ * failure; if the call fails, errno will be set. The caller is responsible
+ * for calling free() on the returned string.
+ */
+ extern char *apol_role_allow_render(const apol_policy_t * policy, const qpol_role_allow_t * rule);
+
+/******************** role_transition queries ********************/
+
+/**
+ * Execute a query against all role_transition rules within the
+ * policy.
+ *
+ * @param p Policy within which to look up role_transition rules.
+ * @param r Structure containing parameters for query. If this is
+ * NULL then return all role_transition rules.
+ * @param v Reference to a vector of qpol_role_trans_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_role_trans_get_by_query(const apol_policy_t * p, const apol_role_trans_query_t * r, apol_vector_t ** v);
+
+/**
+ * Allocate and return a new role trans query structure. All fields
+ * are initialized, such that running this blank query results in
+ * returning all role_transitions within the policy. The caller must
+ * call apol_role_trans_query_destroy() upon the return value
+ * afterwards.
+ *
+ * @return An initialized role trans query structure, or NULL upon
+ * error.
+ */
+ extern apol_role_trans_query_t *apol_role_trans_query_create(void);
+
+/**
+ * Deallocate all memory associated with the referenced role trans
+ * query, and then set it to NULL. This function does nothing if the
+ * query is already NULL.
+ *
+ * @param r Reference to a role trans query structure to destroy.
+ */
+ extern void apol_role_trans_query_destroy(apol_role_trans_query_t ** r);
+
+/**
+ * Set a role trans query to return rules with a particular source
+ * role.
+ *
+ * @param p Policy handler, to report errors.
+ * @param r Role trans query to set.
+ * @param role Limit query to rules with this role as their source, or
+ * NULL to unset this field.
+ *
+ * @return 0 on success, negative on error.
+ */
+ extern int apol_role_trans_query_set_source(const apol_policy_t * p, apol_role_trans_query_t * r, const char *role);
+
+/**
+ * Set a role trans query to return rules with a particular target
+ * symbol. Symbol may be a type or attribute; if it is an alias then
+ * the query will convert it to its primary prior to searching. If
+ * is_indirect is non-zero then the search will be done indirectly.
+ * If the symbol is a type, then the query matches rules with one of
+ * the type's attributes. If the symbol is an attribute, then it
+ * matches rule with any of the attribute's types.
+ *
+ * @param p Policy handler, to report errors.
+ * @param r Role trans query to set.
+ * @param symbol Limit query to rules with this type or attribute as
+ * their target, or NULL to unset this field.
+ * @param is_indirect If non-zero, perform indirect matching.
+ *
+ * @return 0 on success, negative on error.
+ */
+ extern int apol_role_trans_query_set_target(const apol_policy_t * p, apol_role_trans_query_t * r, const char *symbol,
+ int is_indirect);
+
+/**
+ * Set a role trans query to return rules with a particular default
+ * role. This field is ignored if
+ * apol_role_trans_query_set_source_any() is set to non-zero.
+ *
+ * @param p Policy handler, to report errors.
+ * @param r Role trans query to set.
+ * @param role Limit query to rules with this role as their default, or
+ * NULL to unset this field.
+ *
+ * @return 0 on success, negative on error.
+ */
+ extern int apol_role_trans_query_set_default(const apol_policy_t * p, apol_role_trans_query_t * r, const char *role);
+
+/**
+ * Set a role trans query to treat the source role as any. That is,
+ * use the same symbol for either source or default of a
+ * role_transition rule. This flag does nothing if the source role is
+ * not set. Note that a role_transition's target is a type, so thus
+ * this flag does not affect its searching.
+ *
+ * @param p Policy handler, to report errors.
+ * @param r Role trans query to set.
+ * @param is_any Non-zero to use source symbol for source or default
+ * field, 0 to keep source as only source.
+ *
+ * @return Always 0.
+ */
+ extern int apol_role_trans_query_set_source_any(const apol_policy_t * p, apol_role_trans_query_t * r, int is_any);
+
+/**
+ * Set a role trans query to use regular expression searching for
+ * source, target, and default fields. Strings will be treated as
+ * regexes instead of literals. For the target type, matching will
+ * occur against the type name or any of its aliases.
+ *
+ * @param p Policy handler, to report errors.
+ * @param r Role trans query to set.
+ * @param is_regex Non-zero to enable regex searching, 0 to disable.
+ *
+ * @return Always 0.
+ */
+ extern int apol_role_trans_query_set_regex(const apol_policy_t * p, apol_role_trans_query_t * r, int is_regex);
+
+/**
+ * Render a role_transition rule to a string.
+ *
+ * @param policy Policy handler, to report errors.
+ * @param rule The rule to render.
+ *
+ * @return A newly malloc()'d string representation of the rule, or NULL on
+ * failure; if the call fails, errno will be set. The caller is responsible
+ * for calling free() on the returned string.
+ */
+ extern char *apol_role_trans_render(const apol_policy_t * policy, const qpol_role_trans_t * rule);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif