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+/**
+ * @file
+ *
+ * Routines to query type enforcement rules of a policy. These are
+ * type_transition, type_member, and type_change rules.
+ *
+ * @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_TERULE_QUERY_H
+#define APOL_TERULE_QUERY_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include "policy.h"
+#include "vector.h"
+#include <qpol/policy.h>
+
+ typedef struct apol_terule_query apol_terule_query_t;
+
+/**
+ * Execute a query against all type enforcement rules within the policy.
+ *
+ * @param p Policy within which to look up terules.
+ * @param t Structure containing parameters for query. If this is
+ * NULL then return all terules.
+ * @param v Reference to a vector of qpol_terule_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_terule_get_by_query(const apol_policy_t * p, const apol_terule_query_t * t, apol_vector_t ** v);
+
+/**
+ * Execute a query against all syntactic type enforcement rules within
+ * the policy. If the policy has line numbers, then the returned list
+ * will be sorted increasingly by line number.
+ *
+ * @param p Policy within which to look up terules. <b>Must be a
+ * source policy.</b>
+ * @param t Structure containing parameters for query. If this is
+ * NULL then return all terules.
+ * @param v Reference to a vector of qpol_syn_terule_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_syn_terule_get_by_query(const apol_policy_t * p, const apol_terule_query_t * t, apol_vector_t ** v);
+
+/**
+ * Allocate and return a new terule query structure. All fields are
+ * initialized, such that running this blank query results in
+ * returning all terules within the policy. The caller must call
+ * apol_terule_query_destroy() upon the return value afterwards.
+ *
+ * @return An initialized terule query structure, or NULL upon error.
+ */
+ extern apol_terule_query_t *apol_terule_query_create(void);
+
+/**
+ * Deallocate all memory associated with the referenced terule query,
+ * and then set it to NULL. This function does nothing if the query
+ * is already NULL.
+ *
+ * @param t Reference to a terule query structure to destroy.
+ */
+ extern void apol_terule_query_destroy(apol_terule_query_t ** t);
+
+/**
+ * Set a terule query to search only certain type enforcement rules
+ * within the policy. This is a bitmap; use the constants in
+ * libqpol/terule_query.h (QPOL_RULE_TYPE_TRANS, etc.) to give the
+ * rule selections.
+ *
+ * @param p Policy handler, to report errors.
+ * @param te TE rule query to set.
+ * @param rules Bitmap to indicate which rules to search, or 0 to
+ * search all rules.
+ *
+ * @return Always 0.
+ */
+ extern int apol_terule_query_set_rules(const apol_policy_t * p, apol_terule_query_t * t, unsigned int rules);
+
+/**
+ * Set a terule query to return rules whose source symbol matches
+ * 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 t TE rule query to set.
+ * @param symbol Limit query to rules with this symbol as their
+ * source, 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_terule_query_set_source(const apol_policy_t * p, apol_terule_query_t * t, const char *symbol,
+ int is_indirect);
+
+/**
+ * Set an terule query to return rules whose source symbol is matched as a type
+ * or an attribute. The symbol will match both types and attributes by default.
+ * @see apol_avrule_query_set_source() to set the symbol to match.
+ *
+ * @param p Policy handler, to report errors.
+ * @param t TE rule query to set.
+ * @param component Bit-wise or'ed set of APOL_QUERY_SYMBOL_IS_TYPE
+ * and APOL_QUERY_SYMBOL_IS_ATTRIBUTE indicating the type of component
+ * to match.
+ *
+ * @return 0 on success, negative on error.
+ */
+ extern int apol_terule_query_set_source_component(const apol_policy_t * p, apol_terule_query_t * t, unsigned int component);
+
+/**
+ * Set a terule query to return rules whose target symbol matches
+ * 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 t TE rule query to set.
+ * @param symbol Limit query to rules with this symbol 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_terule_query_set_target(const apol_policy_t * p, apol_terule_query_t * t, const char *symbol,
+ int is_indirect);
+
+/**
+ * Set an terule query to return rules whose target symbol is matched as a type
+ * or an attribute. The symbol will match both types and attributes by default.
+ * @see apol_avrule_query_set_source() to set the symbol to match.
+ *
+ * @param p Policy handler, to report errors.
+ * @param t TE rule query to set.
+ * @param component Bit-wise or'ed set of APOL_QUERY_SYMBOL_IS_TYPE
+ * and APOL_QUERY_SYMBOL_IS_ATTRIBUTE indicating the type of component
+ * to match.
+ *
+ * @return 0 on success, negative on error.
+ */
+ extern int apol_terule_query_set_target_component(const apol_policy_t * p, apol_terule_query_t * t, unsigned int component);
+
+/**
+ * Set a terule query to return rules with this default type. The
+ * symbol may be a type or any of its aliases; it may not be an
+ * attribute.
+ *
+ * @param p Policy handler, to report errors.
+ * @param t TE rule query to set.
+ * @param type Name of default type to search.
+ *
+ * @return 0 on success, negative on error.
+ */
+ extern int apol_terule_query_set_default(const apol_policy_t * p, apol_terule_query_t * t, const char *type);
+
+/**
+ * Set at terule query to return rules with this object (non-common)
+ * class. If more than one class are appended to the query, the
+ * rule's class must be one of those appended. (I.e., the rule's
+ * class must be a member of the query's classes.) Pass a NULL to
+ * clear all classes. Note that this performs straight string
+ * comparison, ignoring the regex flag.
+
+ *
+ * @param p Policy handler, to report errors.
+ * @param t TE rule query to set.
+ * @param obj_class Name of object class to add to search set.
+ *
+ * @return 0 on success, negative on error.
+ */
+ extern int apol_terule_query_append_class(const apol_policy_t * p, apol_terule_query_t * t, const char *obj_class);
+
+/**
+ * Set a terule query to return rules that are in conditionals and
+ * whose conditional uses a particular boolean variable.
+ * Unconditional rules will not be returned.
+ *
+ * @param p Policy handler, to report errors.
+ * @param t TE rule query to set.
+ * @param bool_name Name of boolean that conditional must contain. If
+ * NULL then search all rules.
+ *
+ * @return 0 on success, negative on error.
+ */
+ extern int apol_terule_query_set_bool(const apol_policy_t * p, apol_terule_query_t * t, const char *bool_name);
+
+/**
+ * Set a terule query to search only enabled rules within the policy.
+ * These include rules that are unconditional and those within enabled
+ * conditionals.
+ *
+ * @param p Policy handler, to report errors.
+ * @param t TE rule query to set.
+ * @param is_enabled Non-zero to search only enabled rules, 0 to
+ * search all rules.
+ *
+ * @return Always 0.
+ */
+ extern int apol_terule_query_set_enabled(const apol_policy_t * p, apol_terule_query_t * t, int is_enabled);
+
+/**
+ * Set a terule query to treat the source symbol as any. That is, use
+ * the same symbol for either source, target, or default of a rule.
+ * This flag does nothing if the source symbol is not set.
+ *
+ * @param p Policy handler, to report errors.
+ * @param t TE rule 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_terule_query_set_source_any(const apol_policy_t * p, apol_terule_query_t * t, int is_any);
+
+/**
+ * Set a terule query to use regular expression searching for source
+ * and target types/attributes and default type. Strings will be
+ * treated as regexes instead of literals. Matching will occur against
+ * the type name or any of its aliases.
+ *
+ * @param p Policy handler, to report errors.
+ * @param t TE rule query to set.
+ * @param is_regex Non-zero to enable regex searching, 0 to disable.
+ *
+ * @return Always 0.
+ */
+ extern int apol_terule_query_set_regex(const apol_policy_t * p, apol_terule_query_t * t, int is_regex);
+
+/**
+ * Given a single terule, return a newly allocated vector of
+ * qpol_syn_terule_t pointers (relative to the given policy) which
+ * comprise that rule. The vector will be sorted by line numbers if
+ * the policy has line numbers.
+ *
+ * @param p Policy from which to obtain syntactic rules.
+ * @param rule TE rule to convert.
+ *
+ * @return A newly allocated vector of syn_terule_t pointers. The
+ * caller is responsible for calling apol_vector_destroy() afterwards.
+ */
+ extern apol_vector_t *apol_terule_to_syn_terules(const apol_policy_t * p, const qpol_terule_t * rule);
+
+/**
+ * Given a vector of terules (qpol_terule_t pointers), return a newly
+ * allocated vector of qpol_syn_terule_t pointers (relative to the
+ * given policy) which comprise all of those rules. The returned
+ * vector will be sorted by line numbers if the policy has line
+ * numbers. Also, it will not have any duplicate syntactic rules.
+ *
+ * @param p Policy from which to obtain syntactic rules.
+ * @param rules Vector of TE rules to convert.
+ *
+ * @return A newly allocated vector of syn_terule_t pointers. The
+ * caller is responsible for calling apol_vector_destroy() afterwards.
+ */
+ extern apol_vector_t *apol_terule_list_to_syn_terules(const apol_policy_t * p, const apol_vector_t * rules);
+
+/**
+ * Render a terule 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_terule_render(const apol_policy_t * policy, const qpol_terule_t * rule);
+
+/**
+ * Render a syntactic terule 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_syn_terule_render(const apol_policy_t * policy, const qpol_syn_terule_t * rule);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif