tmpl.h

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#pragma once
/*
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
/**
 * $Id: 5104a0071413c011e1d4bda01d057536b1e69dc7 $
 *
 * @file lib/server/tmpl.h
 * @brief Structures and prototypes for templates
 *
 * These functions are used to work with #tmpl_t structs.
 *
 * #tmpl_t (VPTs) specify either a data source, or a data sink.
 *
 * Examples of sources are #TMPL_TYPE_XLAT_UNRESOLVED, #TMPL_TYPE_EXEC and #TMPL_TYPE_ATTR.
 * Examples of sinks are #TMPL_TYPE_ATTR.
 *
 * VPTs are used to gather values or attributes for evaluation, or copying, and to specify
 * where values or #fr_pair_t should be copied to.
 *
 * To create new #tmpl_t use one of the tmpl_*from_* functions.  These parse
 * strings into VPTs. The main parsing function is #tmpl_afrom_substr, which can produce
 * most types of VPTs. It uses the type of quoting (passed as an #fr_token_t) to determine
 * what type of VPT to parse the string as. For example a #T_DOUBLE_QUOTED_STRING will
 * produce either a #TMPL_TYPE_XLAT_UNRESOLVED or a #TMPL_TYPE_DATA_UNRESOLVED (depending if the string
 * contained a non-literal expansion).
 *
 * @see tmpl_afrom_substr
 * @see tmpl_afrom_attr_str
 *
 * In the case of #TMPL_TYPE_ATTR, there are special cursor overlay
 * functions which can be used to iterate over only the #fr_pair_t that match a
 * tmpl_t in a given list.
 *
 * @see tmpl_dcursor_init
 * @see tmpl_cursor_next
 *
 * Or for simplicity, there are functions which wrap the cursor functions, to copy or
 * return the #fr_pair_t that match the VPT.
 *
 * @see tmpl_copy_pairs
 * @see tmpl_find_vp
 *
 * If you just need the string value of whatever the VPT refers to, the tmpl_*expand
 * functions may be used. These functions evaluate the VPT, execing, and xlat expanding
 * as necessary. In the case of #TMPL_TYPE_ATTR, and #FR_TYPE_STRING or #FR_TYPE_OCTETS
 * #tmpl_expand will return a pointer to the raw #fr_pair_t buffer. This can be very
 * useful when using the #CONF_FLAG_TMPL type in #conf_parser_t structs, as it allows the
 * user to determine whether they want the module to sanitise the value using presentation
 * format specific #xlat_escape_legacy_t function, or to operate on the raw value.
 *
 * @see tmpl_expand
 * @see tmpl_aexpand
 *
 * @copyright 2014-2015 The FreeRADIUS server project
 */
RCSIDH(tmpl_h, "$Id: 5104a0071413c011e1d4bda01d057536b1e69dc7 $")
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <freeradius-devel/util/table.h>
#include <freeradius-devel/util/dlist.h>
#include <freeradius-devel/util/value.h>
 
#include <freeradius-devel/server/tmpl_escape.h>
 
/** The maximum number of request references allowed
 *
 */
#define TMPL_MAX_REQUEST_REF_NESTING    10
 
extern fr_table_num_ordered_t const pair_list_table[];
extern size_t pair_list_table_len;
 
typedef enum requests_ref_e {
        REQUEST_CURRENT = 0,            //!< The current request (default).
        REQUEST_OUTER,                  //!< #request_t containing the outer layer of the EAP
                                        //!< conversation. Usually the RADIUS request sent
                                        //!< by the NAS.
 
        REQUEST_PARENT,                 //!< Parent (whatever it is).
        REQUEST_UNKNOWN                 //!< Unknown request.
} tmpl_request_ref_t;
 
extern fr_table_num_sorted_t const tmpl_request_ref_table[];
extern size_t tmpl_request_ref_table_len;
 
/** Base data type is an attribute reference
 *
 */
#define TMPL_FLAG_ATTR          0x01000000
 
/** Base data type is an xlat expansion
 *
 */
#define TMPL_FLAG_XLAT          0x02000000
 
/** Is a type of regular expression
 *
 */
#define TMPL_FLAG_REGEX         0x04000000
 
/** Needs resolution
 *
 */
#define TMPL_FLAG_UNRESOLVED    0x08000000
 
/** Types of #tmpl_t
 *
 * Types may be compound types made up of multiple other types.
 *
 * Types which are used as part of compound types are:
 * - XLAT_TYPE_XLAT             - #tmpl_t contains xlat expansion.
 * - XLAT_TYPE_UNRESOLVED       - #tmpl_t contains unresolved elements such as xlat functions or other expansions.
 */
typedef enum tmpl_type_e {
        /** Uninitialised
         */
        TMPL_TYPE_UNINITIALISED         = 0x0000,
 
        /** Has no value.  Usually a placeholder in a binary expression that's really a unary expression
         */
        TMPL_TYPE_NULL                  = 0x0001,
 
        /** Value in native boxed format
         */
        TMPL_TYPE_DATA                  = 0x0002,
 
        /** Reference to one or more attributes
         */
        TMPL_TYPE_ATTR                  = 0x0008 | TMPL_FLAG_ATTR,
 
        /** Pre-parsed xlat expansion
         */
        TMPL_TYPE_XLAT                  = 0x0010 | TMPL_FLAG_XLAT,
 
        /** Callout to an external script or program
         */
        TMPL_TYPE_EXEC                  = 0x0020 | TMPL_FLAG_XLAT,
 
        /** Compiled (and possibly JIT'd) regular expression
         */
        TMPL_TYPE_REGEX                 = 0x0040 | TMPL_FLAG_REGEX,
 
        /** Regex where compilation is possible but hasn't been performed yet
         */
        TMPL_TYPE_REGEX_UNCOMPILED      = 0x0080 | TMPL_FLAG_REGEX,
 
        /** A regex containing xlat expansions.  Cannot be pre-compiled
         */
        TMPL_TYPE_REGEX_XLAT            = 0x0100 | TMPL_FLAG_REGEX | TMPL_FLAG_XLAT,
 
        /** @name unresolved types
         *
         * These are tmpls which could not immediately be transformed into
         * their "resolved" form due to missing references or because
         * additional parsing is required.
         *
         * @{
         */
 
        /** Unparsed literal string
         *
         * May be an intermediary phase where the tmpl is created as a
         * temporary structure during parsing.  The value here MUST be raw
         * data, and cannot be anything else.
         */
        TMPL_TYPE_DATA_UNRESOLVED        =  TMPL_TYPE_DATA | TMPL_FLAG_UNRESOLVED,
 
        /** An attribute reference that we couldn't resolve but looked valid
         *
         * May be resolvable later once more attributes are defined.
         */
        TMPL_TYPE_ATTR_UNRESOLVED       = TMPL_TYPE_ATTR | TMPL_FLAG_UNRESOLVED,
 
        /** An exec with unresolved xlat function or attribute references
         */
        TMPL_TYPE_EXEC_UNRESOLVED       = TMPL_TYPE_EXEC | TMPL_FLAG_UNRESOLVED,
 
        /** A xlat expansion with unresolved xlat functions or attribute references
         */
        TMPL_TYPE_XLAT_UNRESOLVED       = TMPL_TYPE_XLAT | TMPL_FLAG_UNRESOLVED,
 
        /** A regular expression with unresolved xlat functions or attribute references
         */
        TMPL_TYPE_REGEX_XLAT_UNRESOLVED = TMPL_TYPE_REGEX_XLAT | TMPL_FLAG_UNRESOLVED,
 
        TMPL_TYPE_MAX                   //!< Marker for the last tmpl type.
} tmpl_type_t;
 
/** Helpers to verify the type of #tmpl_t
 */
#define tmpl_is_uninitialised(vpt)              (vpt->type == TMPL_TYPE_UNINITIALISED)
 
#define tmpl_is_null(vpt)                       (vpt->type == TMPL_TYPE_NULL)
#define tmpl_is_data(vpt)                       (vpt->type == TMPL_TYPE_DATA)
 
#define tmpl_is_attr(vpt)                       (vpt->type == TMPL_TYPE_ATTR)
 
#define tmpl_is_xlat(vpt)                       (vpt->type == TMPL_TYPE_XLAT)
#define tmpl_is_exec(vpt)                       (vpt->type == TMPL_TYPE_EXEC)
 
#define tmpl_is_regex(vpt)                      (vpt->type == TMPL_TYPE_REGEX)
#define tmpl_is_regex_uncompiled(vpt)           (vpt->type == TMPL_TYPE_REGEX_UNCOMPILED)
#define tmpl_is_regex_xlat(vpt)                 (vpt->type == TMPL_TYPE_REGEX_XLAT)
 
#define tmpl_is_data_unresolved(vpt)            (vpt->type == TMPL_TYPE_DATA_UNRESOLVED)
#define tmpl_is_exec_unresolved(vpt)            (vpt->type == TMPL_TYPE_EXEC_UNRESOLVED)
#define tmpl_is_attr_unresolved(vpt)            (vpt->type == TMPL_TYPE_ATTR_UNRESOLVED)
#define tmpl_is_xlat_unresolved(vpt)            (vpt->type == TMPL_TYPE_XLAT_UNRESOLVED)
#define tmpl_is_regex_xlat_unresolved(vpt)      (vpt->type == TMPL_TYPE_REGEX_XLAT_UNRESOLVED)
 
#define tmpl_needs_resolving(vpt)               (vpt->type & TMPL_FLAG_UNRESOLVED)
#define tmpl_contains_attr(vpt)                 (vpt->type & TMPL_FLAG_ATTR)
#define tmpl_contains_regex(vpt)                (vpt->type & TMPL_FLAG_REGEX)
#define tmpl_contains_xlat(vpt)                 (vpt->type & TMPL_FLAG_XLAT)
 
extern fr_table_num_ordered_t const tmpl_type_table[];
extern size_t tmpl_type_table_len;
 
typedef struct tmpl_rules_s tmpl_rules_t;
typedef struct tmpl_attr_rules_s tmpl_attr_rules_t;
typedef struct tmpl_xlat_rules_s tmpl_xlat_rules_t;
typedef struct tmpl_literal_rules_s tmpl_literal_rules_t;
typedef struct tmpl_res_rules_s tmpl_res_rules_t;
typedef struct tmpl_s tmpl_t;
 
#include <freeradius-devel/unlang/xlat.h>
#include <freeradius-devel/unlang/xlat_ctx.h>
#include <freeradius-devel/util/packet.h>
#include <freeradius-devel/util/proto.h>
#include <freeradius-devel/util/regex.h>
 
/*
 *      Allow public and private versions of the same structures
 */
#ifdef _CONST
#  error _CONST can only be defined in the local header
#endif
#ifndef _TMPL_PRIVATE
#  define _CONST const
#else
#  define _CONST
#endif
 
/** Specify whether attribute references require a prefix
 *
 */
typedef enum {
        TMPL_ATTR_REF_PREFIX_YES = 0,                   //!< Attribute refs must have '&' prefix.
        TMPL_ATTR_REF_PREFIX_NO,                        //!< Attribute refs have no '&' prefix.
        TMPL_ATTR_REF_PREFIX_AUTO                       //!< Attribute refs may have a '&' prefix.
} tmpl_attr_prefix_t;
 
/** Specify whether attribute references can have a list (or parent) reference
 *
 */
typedef enum {
        TMPL_ATTR_LIST_ALLOW = 0,                       //!< Attribute refs are allowed to have a list
        TMPL_ATTR_LIST_FORBID,                          //!< Attribute refs are forbidden from having a list
        TMPL_ATTR_LIST_REQUIRE                          //!< Attribute refs are required to have a list.
} tmpl_attr_list_presence_t;
 
/** Define entry and head types for tmpl request references
 *
 */
FR_DLIST_TYPES(tmpl_request_list)
 
struct tmpl_attr_rules_s {
        fr_dict_t const         *dict_def;              //!< Default dictionary to use
                                                        ///< with unqualified attribute references.
 
        fr_dict_attr_t const    *namespace;             //!< Point in dictionary tree to resume parsing
                                                        ///< from.  If this is provided then dict_def
                                                        ///< request_def and list_def will be ignored
                                                        ///< and the presence of any of those qualifiers
                                                        ///< will be treated as an error.
 
        FR_DLIST_HEAD(tmpl_request_list) _CONST *request_def;   //!< Default request to use with
                                                        ///< unqualified attribute references.
                                                        ///< If NULL the request is assumed to
                                                        ///< but the current request.
                                                        ///< Usually this will be one of
                                                        ///< - tmpl_request_def_current
                                                        ///< - tmpl_request_def_outer
                                                        ///< - tmpl_request_def_parent
                                                        ///< If a custom list needs to be
                                                        ///< used it should be allocated on
                                                        ///< the stack and a pointer to it
                                                        ///< placed here.
 
        fr_dict_attr_t const    *list_def;              //!< Default list to use with unqualified
                                                        ///< attribute reference.
 
        tmpl_attr_prefix_t      prefix;                 //!< Whether the attribute reference requires
                                                        ///< a prefix.
 
        tmpl_attr_list_presence_t list_presence;        //!< Whether the attribute reference can
                                                        ///< have a list, forbid it, or require it.
 
        uint8_t                 allow_unknown:1;        //!< Allow unknown attributes i.e. attributes
                                                        ///< defined by OID string.
 
        uint8_t                 allow_unresolved:1;     //!< Allow attributes that look valid but were
                                                        ///< not found in the dictionaries.
                                                        ///< This should be used as part of a multi-pass
                                                        ///< approach to parsing.
 
        uint8_t                 allow_wildcard:1;       //!< Allow the special case of .[*] representing
                                                        ///< all children of a structural attribute.
 
        uint8_t                 allow_foreign:1;        //!< Allow arguments not found in dict_def.
 
        uint8_t                 disallow_filters:1;     //!< disallow filters.
};
 
struct tmpl_xlat_rules_s {
        fr_event_list_t         *runtime_el;            //!< The eventlist to use for runtime instantiation
                                                        ///< of xlats.
        bool                    new_functions;          //!< new function syntax
};
 
/** Optional arguments passed to vp_tmpl functions
 *
 */
struct tmpl_rules_s {
        tmpl_rules_t const              *parent;                //!< for parent / child relationships
 
        tmpl_attr_rules_t               attr;                   //!< Rules/data for parsing attribute references.
        tmpl_xlat_rules_t               xlat;                   //!< Rules/data for parsing xlats.
 
        fr_dict_attr_t const            *enumv;                 //!< Enumeration attribute used to resolve enum values.
 
        fr_type_t                       cast;                   //!< Whether there was an explicit cast.
                                                                ///< Used to determine if barewords or other values
                                                                ///< should be converted to an internal data type.
 
        bool                            at_runtime;             //!< Produce an ephemeral/runtime tmpl.
                                                                ///< Instantiated xlats are not added to the global
                                                                ///< trees, regexes are not JIT'd.
        fr_value_box_safe_for_t         literals_safe_for;      //!< safe_for value assigned to literal values in
                                                                ///< xlats, execs, and data.
        tmpl_escape_t                   escape;                 //!< How escaping should be handled during evaluation.
};
 
/** Similar to tmpl_rules_t, but used to specify parameters that may change during subsequent resolution passes
 *
 * When a tmpl is parsed initially the rules are stored in the #tmpl_t.
 *
 * During subsequent resolution phases where unresolved attributes are resolved to dictionary
 * attributes the initial #tmpl_rules_t is used to control resolution.
 *
 * In some instances however (primarily policies), some rules may need change between initial
 * parsing and subsequent resolution phases.
 *
 * This structure holds rules which may override the tmpl_rules_s during subsequent resolution passes.
 */
struct tmpl_res_rules_s {
        fr_dict_t const         *dict_def;              //!< Alternative default dictionary to use if
                                                        ///< vpt->rules->dict_def is NULL.
                                                        //!< Will be written to vpt->rules->dict_def
                                                        ///< if used.
 
        bool                    force_dict_def;         //!< Use supplied dict_def even if original
                                                        ///< vpt->rules->dict_def was not NULL.
 
        fr_dict_attr_t const    *enumv;                 //!< for resolving T_BARE_WORD
};
 
typedef enum {
        TMPL_ATTR_TYPE_NORMAL = 0,                      //!< Normal, resolved, attribute ref.
        TMPL_ATTR_TYPE_UNSPEC,                          //!< No attribute was specified as this level
                                                        ///< only a filter.
        TMPL_ATTR_TYPE_UNKNOWN,                         //!< We have an attribute number but
                                                        ///< it doesn't match anything in the
                                                        ///< dictionary, or isn't a child of
                                                        ///< the previous ref.  May be resolved
                                                        ///< later.
        TMPL_ATTR_TYPE_UNRESOLVED                       //!< We have a name, but nothing else
                                                        ///< to identify the attribute.
                                                        ///< may be resolved later.
} tmpl_attr_type_t;
 
#define NUM_UNSPEC                      INT16_MIN
#define NUM_ALL                         (INT16_MIN + 1)
#define NUM_COUNT                       (INT16_MIN + 2)
#define NUM_LAST                        (INT16_MIN + 3)
 
/** Define entry and head types for attribute reference lists
 *
 */
FR_DLIST_TYPES(tmpl_attr_list)
 
/** Different types of filter that can be applied to an attribute reference
 *
 */
typedef enum {
        TMPL_ATTR_FILTER_TYPE_NONE = 0,                 //!< No filter present.
        TMPL_ATTR_FILTER_TYPE_INDEX,                    //!< Filter is an index type.
        TMPL_ATTR_FILTER_TYPE_CONDITION,                //!< Filter is a condition
} tmpl_attr_filter_type_t;
 
typedef struct {
        tmpl_attr_filter_type_t _CONST type;            //!< Type of filter this is.
        int16_t                 _CONST num;             //!< For array references.
        xlat_exp_head_t         _CONST *cond;           //!< xlat condition
} tmpl_attr_filter_t;
 
/** An element in a list of nested attribute references
 *
 */
typedef struct {
        FR_DLIST_ENTRY(tmpl_attr_list)  _CONST entry;   //!< Entry in the doubly linked list
                                                        ///< of attribute references.
 
        fr_dict_attr_t const    * _CONST da;            //!< Resolved dictionary attribute.
 
        union {
                struct {
                        fr_dict_attr_t          * _CONST da;            //!< Unknown dictionary attribute.
                } unknown;
 
                struct {
                        char                    * _CONST name;          //!< Undefined reference type.
                        fr_dict_attr_t const    * _CONST namespace;     //!< Namespace we should be trying
                                                                        ///< to resolve this attribute in.
                } unresolved;
        };
 
        fr_dict_attr_t const    * _CONST parent;        //!< The parent we used when trying to
                                                        ///< resolve the attribute originally.
                                                        ///< Should point to the referenced
                                                        ///< attribute.
 
        unsigned int            _CONST resolve_only : 1; //!< This reference and those before it
                                                        ///< in the list can only be used for
                                                        ///< resolution, not building out trees.
        unsigned int            _CONST is_raw : 1;      /// is a raw reference
 
        tmpl_attr_type_t        _CONST type;            //!< Type of attribute reference.
 
        tmpl_attr_filter_t      _CONST filter;          //!< Filter associated with the attribute reference.
} tmpl_attr_t;
 
/** Define manipulation functions for the attribute reference list
 *
 */
FR_DLIST_FUNCS(tmpl_attr_list, tmpl_attr_t, entry)
 
/** An element in a list of request references
 *
 */
typedef struct {
        FR_DLIST_ENTRY(tmpl_request_list)       _CONST entry;   //!< Entry in the doubly linked list
                                                                ///< of request references.
 
        tmpl_request_ref_t                      _CONST request;
} tmpl_request_t;
 
/** Define manipulation functions for the attribute reference list
 *
 */
FR_DLIST_FUNCS(tmpl_request_list, tmpl_request_t, entry)
 
/** How many additional headers to allocate in a pool for a tmpl_t
 *
 */
#define TMPL_POOL_DEF_HEADERS           4
 
/** How many additional bytes to allocate in a pool for a tmpl_t
 *
 */
#define TMPL_POOL_DEF_LEN               (sizeof(tmpl_t) + 64 + sizeof(tmpl_attr_t) + sizeof(tmpl_request_t))
 
/** @name Field accessors for attribute references
 *
 * @{
 */
#define ar_type                         type
#define ar_depth                        depth
#define ar_da                           da
#define ar_parent                       parent
#define ar_unknown                      unknown.da
#define ar_unresolved                   unresolved.name
#define ar_unresolved_namespace         unresolved.namespace
 
#define ar_is_normal(_ar)               ((_ar)->ar_type == TMPL_ATTR_TYPE_NORMAL)
#define ar_is_unspecified(_ar)          ((_ar)->ar_type == TMPL_ATTR_TYPE_UNSPEC)
#define ar_is_unknown(_ar)              ((_ar)->ar_type == TMPL_ATTR_TYPE_UNKNOWN)
#define ar_is_unresolved(_ar)           ((_ar)->ar_type == TMPL_ATTR_TYPE_UNRESOLVED)
#define ar_is_raw(_ar)                  ((_ar)->is_raw)
 
#define ar_num                          filter.num
#define ar_cond                         filter.cond
#define ar_filter_type                  filter.type
 
#define ar_filter_is_none(_ar)          ((_ar)->ar_filter_type == TMPL_ATTR_FILTER_TYPE_NONE)
#define ar_filter_is_num(_ar)           ((_ar)->ar_filter_type == TMPL_ATTR_FILTER_TYPE_INDEX)
#define ar_filter_is_cond(_ar)          ((_ar)->ar_filter_type == TMPL_ATTR_FILTER_TYPE_CONDITION)
/** @} */
 
/** A source or sink of value data.
 *
 * Is used as both the RHS and LHS of a map (both update, and conditional types)
 *
 * @section update_maps Use in update map_t
 * When used on the LHS it describes an attribute to create and should be one of these types:
 * - #TMPL_TYPE_ATTR
 *
 * When used on the RHS it describes the value to assign to the attribute being created and
 * should be one of these types:
 * - #TMPL_TYPE_DATA_UNRESOLVED
 * - #TMPL_TYPE_XLAT_UNRESOLVED
 * - #TMPL_TYPE_ATTR
 * - #TMPL_TYPE_EXEC
 * - #TMPL_TYPE_DATA
 * - #TMPL_TYPE_XLAT (pre-parsed xlat)
 *
 * @section conditional_maps Use in conditional map_t
 * When used as part of a condition it may be any of the RHS side types, as well as:
 * - #TMPL_TYPE_REGEX (pre-parsed regex)
 *
 * @see map_t
 */
struct tmpl_s {
        tmpl_type_t     _CONST type;            //!< What type of value tmpl refers to.
 
        char const      * _CONST name;          //!< Raw string used to create the template.
                                                ///< this string will have any escape sequences left intact.
        size_t          _CONST len;             //!< Length of the raw string used to create the template.
        fr_token_t      _CONST quote;           //!< What type of quoting was around the raw string.
 
        union {
                char *unescaped;                //!< Unescaped form of the name, used for TMPL_TYPE_DATA_UNRESOLVED
                                                ///< and TMPL_TYPE_REGEX_UNCOMPILED.
 
                _CONST struct {
                        bool                    ref_prefix;     //!< true if the reference was prefixed
                                                                ///< with a '&'.
                        FR_DLIST_HEAD(tmpl_request_list)        rr;     //!< Request to search or insert in.
                        FR_DLIST_HEAD(tmpl_attr_list)           ar;     //!< Head of the attribute reference list.
                } attribute;
 
                /*
                 *  Attribute value. Typically used as the RHS of an update map.
                 */
                fr_value_box_t  literal;                         //!< Value data.
 
                struct {
                        union {
                                _CONST struct {
                                        xlat_exp_head_t         *ex;            //!< pre-parsed xlat expansion
                                                                                ///< and expansion.
                                } xlat;
#ifdef HAVE_REGEX
                                _CONST struct {
                                        char                    *src;           //!< Original unescaped source string.
                                        regex_t                 *ex;            //!< pre-parsed regex_t
                                        bool                    subcaptures;    //!< Whether the regex was compiled with
                                                                                ///< subcaptures.
                                } reg;
#endif
                        };
                        fr_regex_flags_t        reg_flags;      //!< Flags for regular expressions.
                                                                ///< Used by:
                                                                ///< - TMPL_TYPE_REGEX_XLAT
                                                                ///< - TMPL_TYPE_REGEX_UNCOMPILED
                                                                ///< - TMPL_TYPE_REGEX
                                                                ///< - TMPL_TYPE_REGEX_XLAT_UNRESOLVED
                };
        } data;
 
        tmpl_rules_t            _CONST  rules;          //!< The rules that were used when creating the tmpl.
                                                        ///< These are useful for multiple resolution passes as
                                                        ///< they ensure the correct parsing rules are applied.
};
 
/** Describes the current extents of a pair tree in relation to the tree described by a tmpl_t
 *
 */
typedef struct {
        fr_dlist_t              entry;          //!< Entry in the dlist of extents
 
        tmpl_attr_t const       *ar;            //!< Attribute representing the ar
                                                ///< after the deepest node that was found
                                                ///< in the existing pair tree when evaluating
                                                ///< this path. If this is NULL, then all ars
                                                ///< were evaluated.
 
        TALLOC_CTX              *list_ctx;      //!< Where to allocate new attributes if building
                                                ///< out from the current extents of the tree.
        fr_pair_list_t          *list;          //!< List that we tried to evaluate ar in and failed.
                                                ///< Or if ar is NULL, the list that represents the
                                                ///< deepest grouping or TLV attribute the chain of
                                                ///< ars referenced.
} tmpl_attr_extent_t;
 
/** Convenience macro for printing a meaningful assert message when we get a bad tmpl type
 */
#define tmpl_assert_type(_cond) \
        fr_assert_msg(_cond, "Unexpected tmpl type '%s'", \
                      tmpl_type_to_str(vpt->type))
 
 
/** @name Functions for printing and parsing tmpl type names
 *
 * @{
 */
/** Return a static string containing the type name
 *
 * @param[in] type to return name for.
 * @return name of the type
 */
static inline char const *tmpl_type_to_str(tmpl_type_t type)
{
        return fr_table_str_by_value(tmpl_type_table, type, "<INVALID>");
}
 
/** Return the constant value representing a type
 *
 * @param[in] type to return the constant value for.
 * @return The constant type value or TMPL_TYPE_UNINITIALISED if no type matches.
 */
static inline tmpl_type_t tmpl_type_from_str(char const *type)
{
        return fr_table_value_by_str(tmpl_type_table, type, TMPL_TYPE_UNINITIALISED);
}
/** @} */
 
/** @name Field accessors for #TMPL_TYPE_ATTR, #TMPL_TYPE_ATTR_UNRESOLVED
 *
 * @{
 */
 #define tmpl_attr(_tmpl)       &(_tmpl)->data.attribute.ar
 
static inline FR_DLIST_HEAD(tmpl_request_list) const *tmpl_request(tmpl_t const *vpt)
{
        tmpl_assert_type(tmpl_is_attr(vpt) ||
                         tmpl_is_attr_unresolved(vpt));
 
        return &vpt->data.attribute.rr;
}
 
/** The number of request references contained within a tmpl
 *
 */
static inline size_t tmpl_request_ref_count(tmpl_t const *vpt)
{
        tmpl_assert_type(tmpl_is_attr(vpt) ||
                         tmpl_is_attr_unresolved(vpt));
 
        return tmpl_request_list_num_elements(&vpt->data.attribute.rr);
}
 
/** Return true if the tmpl_attr is one of the list types
 *
 * @hidecallergraph
*/
static inline bool tmpl_attr_is_list_attr(tmpl_attr_t const *ar)
{
        if (!ar || !ar_is_normal(ar)) return false;
 
        return (ar->ar_da == request_attr_request) ||
               (ar->ar_da == request_attr_reply) ||
               (ar->ar_da == request_attr_control) ||
               (ar->ar_da == request_attr_state) ||
               (ar->ar_da == request_attr_local);
}
 
/** Return true if the head attribute reference is a list reference
 *
 * @hidecallergraph
 */
static inline bool tmpl_attr_head_is_list(tmpl_t const *vpt)
{
        tmpl_attr_t *ar;
 
        tmpl_assert_type(tmpl_contains_attr(vpt));
 
        ar = tmpl_attr_list_head(tmpl_attr(vpt));
        if (unlikely(!ar)) return false;
 
        return tmpl_attr_is_list_attr(ar);
}
 
/** Return true if the last attribute reference is "normal"
 *
 * @hidecallergraph
 */
static inline bool tmpl_attr_tail_is_normal(tmpl_t const *vpt)
{
        tmpl_attr_t *ar;
 
        tmpl_assert_type(tmpl_is_attr(vpt));
 
        ar = tmpl_attr_list_tail(tmpl_attr(vpt));
        if (unlikely(!ar)) return false;
 
        return ar_is_normal(ar);
}
 
/** Return true if the last attribute reference is "unspecified"
 *
 * @hidecallergraph
 */
static inline bool tmpl_attr_tail_is_unspecified(tmpl_t const *vpt)
{
        tmpl_attr_t *ar;
 
        tmpl_assert_type(tmpl_is_attr(vpt));
 
        ar = tmpl_attr_list_tail(tmpl_attr(vpt));
        if (unlikely(!ar)) return false;
 
        return ar_is_unspecified(ar);
}
 
/** Return true if the last attribute reference is "unknown"
 *
 * @hidecallergraph
 */
static inline bool tmpl_attr_tail_is_unknown(tmpl_t const *vpt)
{
        tmpl_attr_t *ar;
 
        tmpl_assert_type(tmpl_is_attr(vpt));
 
        ar = tmpl_attr_list_tail(tmpl_attr(vpt));
        if (unlikely(!ar)) return false;
 
        return ar_is_unknown(ar);
}
 
/** Return true if the last attribute reference is "unresolved"
 *
 * @hidecallergraph
 */
static inline bool tmpl_attr_tail_is_unresolved(tmpl_t const *vpt)
{
        tmpl_attr_t *ar;
 
        tmpl_assert_type(tmpl_contains_attr(vpt));
 
        ar = tmpl_attr_list_tail(tmpl_attr(vpt));
        if (unlikely(!ar)) return false;
 
        return ar_is_unresolved(ar);
}
 
/** Return true if the last attribute reference is "raw"
 *
 * @hidecallergraph
 */
static inline bool tmpl_attr_tail_is_raw(tmpl_t const *vpt)
{
        tmpl_attr_t *ar;
 
        tmpl_assert_type(tmpl_contains_attr(vpt));
 
        ar = tmpl_attr_list_tail(tmpl_attr(vpt));
        if (unlikely(!ar)) return false;
 
        return ar_is_raw(ar);
}
 
/** Return the last attribute reference
 *
 * @hidecallergraph
 */
static inline tmpl_attr_t const *tmpl_attr_tail(tmpl_t const *vpt)
{
        tmpl_assert_type(tmpl_is_attr(vpt));
 
        return tmpl_attr_list_tail(tmpl_attr(vpt));
}
 
/** Return the last attribute reference da
 *
 * @hidecallergraph
 */
static inline fr_dict_attr_t const *tmpl_attr_tail_da(tmpl_t const *vpt)
{
        tmpl_attr_t *ar;
 
        tmpl_assert_type(tmpl_is_attr(vpt));
 
        ar = tmpl_attr_list_tail(tmpl_attr(vpt));
        if (!ar) return NULL;
 
        return ar->ar_da;
}
 
/** Return true if the the last attribute reference is a leaf attribute
 *
 * @hidecallergraph
 */
static inline bool tmpl_attr_tail_da_is_leaf(tmpl_t const *vpt)
{
        tmpl_attr_t *ar;
 
        tmpl_assert_type(tmpl_contains_attr(vpt));
 
        ar = tmpl_attr_list_tail(tmpl_attr(vpt));
        if (!ar) return false;
 
        fr_assert(ar_is_normal(ar) || ar_is_unknown(ar) || ar_is_unspecified(ar));
 
        return fr_type_is_leaf(ar->ar_da->type);
}
 
/** Return true if the the last attribute reference is a structural attribute
 *
 * @hidecallergraph
 */
static inline bool tmpl_attr_tail_da_is_structural(tmpl_t const *vpt)
{
        tmpl_attr_t *ar;
 
        tmpl_assert_type(tmpl_contains_attr(vpt));
 
        ar = tmpl_attr_list_tail(tmpl_attr(vpt));
        if (!ar) return false;
 
        fr_assert(ar_is_normal(ar) || ar_is_unknown(ar) || ar_is_unspecified(ar));
 
        return fr_type_is_structural(ar->ar_da->type);
}
 
/** Return the last attribute reference unknown da
 *
 * @hidecallergraph
 */
static inline fr_dict_attr_t const *tmpl_attr_tail_unknown(tmpl_t const *vpt)
{
        tmpl_attr_t *ar;
 
        tmpl_assert_type(tmpl_is_attr(vpt));
 
        ar = tmpl_attr_list_tail(tmpl_attr(vpt));
        if (!ar) return NULL;
 
        return ar->ar_unknown;
}
 
/** Return the last attribute reference unresolved da
 *
 * @hidecallergraph
 */
static inline char const *tmpl_attr_tail_unresolved(tmpl_t const *vpt)
{
        tmpl_attr_t *ar;
 
        tmpl_assert_type(tmpl_is_attr_unresolved(vpt));
 
        ar = tmpl_attr_list_tail(tmpl_attr(vpt));
        if (!ar) return NULL;
 
        return ar->ar_unresolved;
}
 
/** Return the last attribute reference's attribute number
 *
 * @hidecallergraph
 */
static inline int16_t tmpl_attr_tail_num(tmpl_t const *vpt)
{
        tmpl_assert_type(tmpl_is_attr(vpt) ||
                         tmpl_is_attr_unresolved(vpt));
 
        return tmpl_attr_list_tail(tmpl_attr(vpt))->ar_num;
}
 
/** The number of attribute references contained within a tmpl
 *
 */
static inline size_t tmpl_attr_num_elements(tmpl_t const *vpt)
{
        tmpl_assert_type(tmpl_is_attr(vpt) ||
                         tmpl_is_attr_unresolved(vpt));
 
        return tmpl_attr_list_num_elements(tmpl_attr(vpt));
}
 
static inline fr_dict_attr_t const *tmpl_list(tmpl_t const *vpt)
{
        if (!tmpl_attr_head_is_list(vpt)) return NULL;
 
        return tmpl_attr_list_head(tmpl_attr(vpt))->ar_da;
}
/** @} */
 
/** Return the name of a tmpl list or def if list not provided
 *
*/
static inline char const *tmpl_list_name(fr_dict_attr_t const *list, char const *def)
{
        return (list ? list->name : def);
}
 
static inline bool tmpl_is_list(tmpl_t const *vpt)
{
        if (!tmpl_is_attr(vpt)) return false;
        return tmpl_attr_is_list_attr(tmpl_attr_tail(vpt));
}
 
/** @name Field accessors for #TMPL_TYPE_XLAT
 *
 * @{
 */
#define tmpl_xlat(_tmpl)                        (_tmpl)->data.xlat.ex
/** @} */
 
/** @name Field accessors for #TMPL_TYPE_DATA
 *
 * @{
 */
#define tmpl_value(_tmpl)                       (&(_tmpl)->data.literal)
#define tmpl_value_length(_tmpl)                (_tmpl)->data.literal.vb_length
#define tmpl_value_type(_tmpl)                  (_tmpl)->data.literal.type
#define tmpl_value_enumv(_tmpl)                 (_tmpl)->data.literal.enumv
 
#define tmpl_rules_cast(_tmpl)                  (_tmpl)->rules.cast
#define tmpl_rules_enumv(_tmpl)                 (_tmpl)->rules.enumv
/** @} */
 
/** @name Field accessors for #TMPL_TYPE_REGEX and #TMPL_TYPE_REGEX_XLAT_UNRESOLVED
 *
 * @{
 */
#ifdef HAVE_REGEX
#  define tmpl_regex(_tmpl)                     (_tmpl)->data.reg.ex            //!< #TMPL_TYPE_REGEX only.
#  define tmpl_regex_flags(_tmpl)               (&(_tmpl)->data.reg_flags)
#endif
/** @} */
 
#ifndef WITH_VERIFY_PTR
#  define TMPL_ATTR_VERIFY(_vpt)
#  define TMPL_VERIFY(_vpt)
#else
#  define TMPL_ATTR_VERIFY(_vpt) tmpl_attr_verify(__FILE__, __LINE__, _vpt)
#  define TMPL_VERIFY(_vpt) tmpl_verify(__FILE__, __LINE__, _vpt)
void tmpl_attr_verify(char const *file, int line, tmpl_t const *vpt);
void tmpl_verify(char const *file, int line, tmpl_t const *vpt);
#endif
 
/** Determine the correct context and list head
 *
 * Used in conjunction with the fr_dcursor functions to determine the correct list
 * and TALLOC_CTX for inserting fr_pair_ts.
 *
 * Example:
 @code{.c}
   TALLOC_CTX *ctx;
   fr_pair_list_t *head;
   fr_value_box_t value;
 
   tmpl_pair_list_and_ctx(ctx, head, request, CURRENT_REQUEST, request_attr_request);
   if (!list) return -1; // error
 
   value.strvalue = talloc_typed_strdup(NULL, "my new username");
   value.length = talloc_array_length(value.strvalue) - 1;
 @endcode
 *
 * @param _ctx new #fr_pair_t s should be allocated in for the specified list.
 * @param _head of the #fr_pair_t list.
 * @param _request The current request.
 * @param _ref to resolve.
 * @param _list to resolve.
 */
#define tmpl_pair_list_and_ctx(_ctx, _head, _request, _ref, _list) \
do {\
        request_t *_rctx = _request; \
        if ((tmpl_request_ptr(&_rctx, _ref) < 0) || \
            !(_head = tmpl_list_head(_rctx, _list)) || \
            !(_ctx = tmpl_list_ctx(_rctx, _list))) {\
                _ctx = NULL; \
                _head = NULL; \
        }\
} while (0)
 
typedef enum {
        TMPL_ATTR_ERROR_NONE = 0,                       //!< No error.
        TMPL_ATTR_ERROR_EMPTY,                          //!< Attribute ref contains no data.
        TMPL_ATTR_ERROR_BAD_PREFIX,                     //!< Missing '&' or has '&' when it shouldn't.
        TMPL_ATTR_ERROR_LIST_NOT_ALLOWED,               //!< List qualifier is not allowed here.
        TMPL_ATTR_ERROR_LIST_MISSING,                   //!< List qualifier is required, but missing.
        TMPL_ATTR_ERROR_UNKNOWN_NOT_ALLOWED,            //!< Attribute specified as OID, could not be
                                                        ///< found in the dictionaries, and is disallowed
                                                        ///< because 'disallow_internal' in tmpl_rules_t
                                                        ///< is trie.
        TMPL_ATTR_ERROR_UNRESOLVED_NOT_ALLOWED,         //!< Attribute couldn't be found in the dictionaries.
        TMPL_ATTR_ERROR_UNQUALIFIED_NOT_ALLOWED,        //!< Attribute must be qualified to be used here.
        TMPL_ATTR_ERROR_INVALID_NAME,                   //!< Attribute ref length is zero, or longer than
                                                        ///< the maximum.
        TMPL_ATTR_ERROR_INTERNAL_NOT_ALLOWED,           //!< Attribute resolved to an internal attribute
                                                        ///< which is disallowed.
        TMPL_ATTR_ERROR_FOREIGN_NOT_ALLOWED,            //!< Attribute resolved in a dictionary different
                                                        ///< to the one specified.
        TMPL_ATTR_ERROR_FILTER_NOT_ALLOWED,             //!< Filters disallowed by rules.
        TMPL_ATTR_ERROR_INVALID_ARRAY_INDEX,            //!< Invalid array index.
        TMPL_ATTR_ERROR_INVALID_FILTER,                 //!< Invalid filter
        TMPL_ATTR_ERROR_NESTING_TOO_DEEP,               //!< Too many levels of nesting.
        TMPL_ATTR_ERROR_MISSING_TERMINATOR,             //!< Unexpected text found after attribute reference
        TMPL_ATTR_ERROR_BAD_CAST                        //!< Specified cast was invalid.
} tmpl_attr_error_t;
 
/** Map ptr type to a boxed type
 *
 */
#define FR_TYPE_FROM_PTR(_ptr) \
        _Generic((_ptr), \
                 char **: FR_TYPE_STRING, \
                 char const **: FR_TYPE_STRING, \
                 uint8_t **: FR_TYPE_OCTETS, \
                 uint8_t const **: FR_TYPE_OCTETS, \
                 uint8_t *: FR_TYPE_UINT8, \
                 uint16_t *: FR_TYPE_UINT16, \
                 uint32_t *: FR_TYPE_UINT32, \
                 uint64_t *: FR_TYPE_UINT64, \
                 fr_value_box_t **: FR_TYPE_VALUE_BOX, \
                 fr_value_box_t const **: FR_TYPE_VALUE_BOX)
 
/** Expand a tmpl to a C type, using existing storage to hold variably sized types
 *
 * Expands a template using the _out ptr to determinate the cast type.
 *
 * @see _tmpl_to_type
 */
#define tmpl_expand(_out, _buff, _buff_len, _request, _vpt, _escape, _escape_ctx) \
        _tmpl_to_type((void *)(_out), (uint8_t *)_buff, _buff_len, \
                      _request, _vpt, _escape, _escape_ctx, FR_TYPE_FROM_PTR(_out))
 
/** Expand a tmpl to a C type, allocing a new buffer to hold the string
 *
 * Expands a template using the _out ptr to determinate the cast type.
 *
 * @see _tmpl_to_atype
 */
#define tmpl_aexpand(_ctx, _out, _request, _vpt, _escape, _escape_ctx) \
        _tmpl_to_atype(_ctx, (void *)(_out), _request, _vpt, _escape, _escape_ctx, FR_TYPE_FROM_PTR(_out))
 
/** Expand a tmpl to a C type, allocing a new buffer to hold the string
 *
 * Takes an explicit type which must match the ctype pointed to by out.
 *
 * @see _tmpl_to_atype
 */
#define tmpl_aexpand_type(_ctx, _out, _type, _request, _vpt, _escape, _escape_ctx) \
                          _tmpl_to_atype(_ctx, (void *)(_out), _request, _vpt, _escape, _escape_ctx, _type)
 
void                    tmpl_debug(tmpl_t const *vpt) CC_HINT(nonnull);
 
fr_pair_list_t          *tmpl_list_head(request_t *request, fr_dict_attr_t const *list);
 
fr_packet_t     *tmpl_packet_ptr(request_t *request, fr_dict_attr_t const *list) CC_HINT(nonnull);
 
TALLOC_CTX              *tmpl_list_ctx(request_t *request, fr_dict_attr_t const *list);
 
fr_slen_t               tmpl_attr_list_from_substr(fr_dict_attr_t const **da_p, fr_sbuff_t *in) CC_HINT(nonnull);
 
tmpl_t                  *tmpl_init_printf(tmpl_t *vpt, tmpl_type_t type, fr_token_t quote, char const *fmt, ...) CC_HINT(nonnull(1,4));
 
tmpl_t                  *tmpl_init_shallow(tmpl_t *vpt, tmpl_type_t type, fr_token_t quote,
                                           char const *name, ssize_t len,
                                           tmpl_rules_t const *t_rules) CC_HINT(nonnull(1,4));
 
tmpl_t                  *tmpl_init(tmpl_t *vpt, tmpl_type_t type, fr_token_t quote,
                                   char const *name, ssize_t len,
                                   tmpl_rules_t const *t_rules) CC_HINT(nonnull(1,4));
 
tmpl_t                  *tmpl_alloc(TALLOC_CTX *ctx, tmpl_type_t type, fr_token_t quote, char const *name, ssize_t len);
 
/** @name Parse request qualifiers
 *
 * @{
 */
/** Static default request ref list for the current request
 *
 * Passed as request_def in tmpl_attr_rules_t.
 */
extern FR_DLIST_HEAD(tmpl_request_list) tmpl_request_def_current;
 
/** Static default request ref list for the outer request
 *
 * Passed as request_def in tmpl_attr_rules_t.
 */
extern FR_DLIST_HEAD(tmpl_request_list) tmpl_request_def_outer;
 
/** Static default request ref list for the parent request
 *
 * Passed as request_def in tmpl_attr_rules_t.
 */
extern FR_DLIST_HEAD(tmpl_request_list) tmpl_request_def_parent;
 
int                     tmpl_request_ptr(request_t **request, FR_DLIST_HEAD(tmpl_request_list) const *rql) CC_HINT(nonnull);
 
void                    tmpl_request_ref_list_debug(FR_DLIST_HEAD(tmpl_request_list) const *rql);
 
int8_t                  tmpl_request_ref_list_cmp(FR_DLIST_HEAD(tmpl_request_list) const *a,
                                                  FR_DLIST_HEAD(tmpl_request_list) const *b);
 
/** Returns true if the specified qualifier list points to the current request
 *
 * @param[in] _list     to check.
 * @return
 *      - true if the list only contains a current request qualifier.
 *      - false otherwise.
 */
#define tmpl_request_ref_is_current(_list) (tmpl_request_ref_list_cmp(_list, &tmpl_request_def_current) == 0)
 
/** Returns true if the specified qualifier list points to the parent request
 *
 * @param[in] _list     to check.
 * @return
 *      - true if the list only contains a parent request qualifier.
 *      - false otherwise.
 */
#define tmpl_request_ref_is_parent(_list) (tmpl_request_ref_list_cmp(_list, &tmpl_request_def_parent) == 0)
 
/** Returns true if the specified qualifier list points to the outer request
 *
 * @param[in] _list     to check.
 * @return
 *      - true if the list only contains a outer request qualifier.
 *      - false otherwise.
 */
#define tmpl_request_ref_is_outer(_list) (tmpl_request_ref_list_cmp(_list, &tmpl_request_def_outer) == 0)
 
 
fr_slen_t               tmpl_request_ref_list_afrom_substr(TALLOC_CTX *ctx, tmpl_attr_error_t *err,
                                                           FR_DLIST_HEAD(tmpl_request_list) _CONST **out,
                                                           fr_sbuff_t *in);
/** @} */
 
void                    tmpl_set_name_printf(tmpl_t *vpt, fr_token_t quote, char const *fmt, ...) CC_HINT(nonnull(1,3));
 
void                    tmpl_set_name_shallow(tmpl_t *vpt, fr_token_t quote, char const *name, ssize_t len) CC_HINT(nonnull);
 
void                    tmpl_set_name(tmpl_t *vpt, fr_token_t quote, char const *name, ssize_t len) CC_HINT(nonnull);
 
void                    tmpl_set_dict_def(tmpl_t *vpt, fr_dict_t const *dict) CC_HINT(nonnull);
 
void                    tmpl_set_escape(tmpl_t *vpt, tmpl_escape_t const *escape) CC_HINT(nonnull);
 
void                    tmpl_set_xlat(tmpl_t *vpt, xlat_exp_head_t *xlat) CC_HINT(nonnull);
 
int                     tmpl_afrom_value_box(TALLOC_CTX *ctx, tmpl_t **out, fr_value_box_t *data, bool steal) CC_HINT(nonnull);
 
void                    tmpl_attr_ref_debug(const tmpl_attr_t *ar, int idx) CC_HINT(nonnull);
 
void                    tmpl_attr_ref_list_debug(FR_DLIST_HEAD(tmpl_attr_list) const *ar_head) CC_HINT(nonnull);
 
void                    tmpl_attr_debug(tmpl_t const *vpt) CC_HINT(nonnull);
 
int                     tmpl_attr_copy(tmpl_t *dst, tmpl_t const *src) CC_HINT(nonnull);
 
int                     tmpl_attr_set_da(tmpl_t *vpt, fr_dict_attr_t const *da) CC_HINT(nonnull);
 
int                     tmpl_attr_set_leaf_da(tmpl_t *vpt, fr_dict_attr_t const *da) CC_HINT(nonnull);
 
void                    tmpl_attr_set_leaf_num(tmpl_t *vpt, int16_t num) CC_HINT(nonnull);
 
void                    tmpl_attr_rewrite_leaf_num(tmpl_t *vpt, int16_t from, int16_t to) CC_HINT(nonnull);
 
void                    tmpl_attr_rewrite_num(tmpl_t *vpt, int16_t from, int16_t to) CC_HINT(nonnull);
 
void                    tmpl_attr_set_request_ref(tmpl_t *vpt, FR_DLIST_HEAD(tmpl_request_list) const *request_def) CC_HINT(nonnull);
 
void                    tmpl_attr_set_list(tmpl_t *vpt, fr_dict_attr_t const *list) CC_HINT(nonnull);
 
int                     tmpl_attr_afrom_list(TALLOC_CTX *ctx, tmpl_t **out, tmpl_t const *list,
                                             fr_dict_attr_t const *da) CC_HINT(nonnull);
 
/** @name Produce a #tmpl_t from a string or substring
 *
 * @{
 */
ssize_t                 tmpl_afrom_attr_substr(TALLOC_CTX *ctx, tmpl_attr_error_t *err,
                                               tmpl_t **out, fr_sbuff_t *name,
                                               fr_sbuff_parse_rules_t const *p_rules,
                                               tmpl_rules_t const *t_rules) CC_HINT(nonnull(3,4));
 
ssize_t                 tmpl_afrom_attr_str(TALLOC_CTX *ctx, tmpl_attr_error_t *err,
                                            tmpl_t **out, char const *name,
                                            tmpl_rules_t const *rules) CC_HINT(nonnull (3, 4));
 
ssize_t                 tmpl_afrom_substr(TALLOC_CTX *ctx, tmpl_t **out,
                                          fr_sbuff_t *in,
                                          fr_token_t quote,
                                          fr_sbuff_parse_rules_t const *p_rules,
                                          tmpl_rules_t const *t_rules) CC_HINT(nonnull(2,3));
 
tmpl_t                  *tmpl_copy(TALLOC_CTX *ctx, tmpl_t const *in) CC_HINT(nonnull);
 
ssize_t                 tmpl_cast_from_substr(tmpl_rules_t *t_rules, fr_sbuff_t *in) CC_HINT(nonnull(2));               /* Parses cast string */
 
int                     tmpl_cast_set(tmpl_t *vpt, fr_type_t type) CC_HINT(nonnull);    /* Sets cast type */
 
static inline fr_type_t tmpl_cast_get(tmpl_t *vpt)
{
        return vpt->rules.cast;
}
 
#ifdef HAVE_REGEX
ssize_t                 tmpl_regex_flags_substr(tmpl_t *vpt, fr_sbuff_t *in,
                                                fr_sbuff_term_t const *terminals) CC_HINT(nonnull(1,2));
#endif
/** @} */
 
/** @name Change a #tmpl_t type, usually by casting or resolving a reference
 * @{
 */
int                     tmpl_cast_in_place(tmpl_t *vpt, fr_type_t type, fr_dict_attr_t const *enumv) CC_HINT(nonnull(1));
 
int                     tmpl_resolve(tmpl_t *vpt, tmpl_res_rules_t const *tr_rules) CC_HINT(nonnull(1));
 
void                    tmpl_unresolve(tmpl_t *vpt) CC_HINT(nonnull);
 
int                     tmpl_attr_to_xlat(TALLOC_CTX *ctx, tmpl_t **vpt_p) CC_HINT(nonnull);
 
void                    tmpl_attr_to_raw(tmpl_t *vpt) CC_HINT(nonnull);
 
int                     tmpl_attr_unknown_add(tmpl_t *vpt);
 
int                     tmpl_attr_tail_unresolved_add(fr_dict_t *dict, tmpl_t *vpt,
                                                 fr_type_t type, fr_dict_attr_flags_t const *flags) CC_HINT(nonnull(1));
 
#ifdef HAVE_REGEX
ssize_t                 tmpl_regex_compile(tmpl_t *vpt, bool subcaptures) CC_HINT(nonnull);
#endif
/** @} */
 
/** @name Print the contents of a #tmpl_t
 * @{
 */
fr_slen_t               tmpl_request_ref_list_print(fr_sbuff_t *out, FR_DLIST_HEAD(tmpl_request_list) const *rql)
                        CC_HINT(nonnull(1,2));
 
static inline fr_slen_t tmpl_request_ref_list_aprint(TALLOC_CTX *ctx, char **out, FR_DLIST_HEAD(tmpl_request_list) const *rql)
                        SBUFF_OUT_TALLOC_FUNC_NO_LEN_DEF(tmpl_request_ref_list_print, rql)
 
fr_slen_t               tmpl_attr_print(fr_sbuff_t *out, tmpl_t const *vpt, tmpl_attr_prefix_t ar_prefix) CC_HINT(nonnull(1,2));
 
static inline fr_slen_t tmpl_attr_aprint(TALLOC_CTX *ctx, char **out, tmpl_t const *vpt, tmpl_attr_prefix_t ar_prefix)
                        SBUFF_OUT_TALLOC_FUNC_NO_LEN_DEF(tmpl_attr_print, vpt, ar_prefix)
 
fr_slen_t               tmpl_print(fr_sbuff_t *out, tmpl_t const *vpt,
                                   tmpl_attr_prefix_t ar_prefix, fr_sbuff_escape_rules_t const *e_rules) CC_HINT(nonnull(1,2));
 
static inline fr_slen_t tmpl_aprint(TALLOC_CTX *ctx, char **out, tmpl_t const *vpt,
                                    tmpl_attr_prefix_t ar_prefix, fr_sbuff_escape_rules_t const *e_rules)
                        SBUFF_OUT_TALLOC_FUNC_NO_LEN_DEF(tmpl_print, vpt, ar_prefix, e_rules)
 
fr_slen_t               tmpl_print_quoted(fr_sbuff_t *out, tmpl_t const *vpt, tmpl_attr_prefix_t ar_prefix) CC_HINT(nonnull);
 
static inline fr_slen_t tmpl_aprint_quoted(TALLOC_CTX *ctx, char **out, tmpl_t const *vpt, tmpl_attr_prefix_t ar_prefix)
                        SBUFF_OUT_TALLOC_FUNC_NO_LEN_DEF(tmpl_print_quoted, vpt, ar_prefix)
/** @} */
 
/** @name Expand the tmpl, returning one or more values
 * @{
 */
fr_type_t               tmpl_expanded_type(tmpl_t const *vpt) CC_HINT(nonnull);
 
ssize_t                 _tmpl_to_type(void *out,
                                      uint8_t *buff, size_t outlen,
                                      request_t *request,
                                      tmpl_t const *vpt,
                                      xlat_escape_legacy_t escape, void const *escape_ctx,
                                      fr_type_t dst_type)
                        CC_HINT(nonnull (1, 4, 5));
 
ssize_t                 _tmpl_to_atype(TALLOC_CTX *ctx, void *out,
                                       request_t *request,
                                       tmpl_t const *vpt,
                                       xlat_escape_legacy_t escape, void const *escape_ctx,
                                       fr_type_t dst_type)
                        CC_HINT(nonnull (2, 3, 4));
 
int                     tmpl_copy_pairs(TALLOC_CTX *ctx, fr_pair_list_t *out,
                                        request_t *request, tmpl_t const *vpt) CC_HINT(nonnull(2,3,4));
 
int                     tmpl_copy_pair_children(TALLOC_CTX *ctx, fr_pair_list_t *out,
                                                request_t *request, tmpl_t const *vpt) CC_HINT(nonnull(2,3,4));
 
int                     tmpl_find_vp(fr_pair_t **out, request_t *request, tmpl_t const *vpt) CC_HINT(nonnull(2,3));
 
int                     tmpl_find_or_add_vp(fr_pair_t **out, request_t *request, tmpl_t const *vpt) CC_HINT(nonnull);
 
int                     pair_append_by_tmpl_parent(TALLOC_CTX *ctx, fr_pair_t **out, fr_pair_list_t *list,
                                                   tmpl_t const *vpt, bool skip_list) CC_HINT(nonnull(1,3,4));
 
int                     tmpl_extents_find(TALLOC_CTX *ctx,
                                          fr_dlist_head_t *leaf, fr_dlist_head_t *interior,
                                          request_t *request, tmpl_t const *vpt) CC_HINT(nonnull(5));
 
int                     tmpl_extents_build_to_leaf_parent(fr_dlist_head_t *leaf, fr_dlist_head_t *interior,
                                                   tmpl_t const *vpt) CC_HINT(nonnull);
 
void                    tmpl_extents_debug(fr_dlist_head_t *head) CC_HINT(nonnull);
 
int                     tmpl_eval_pair(TALLOC_CTX *ctx, fr_value_box_list_t *out, request_t *request, tmpl_t const *vpt);
 
int                     tmpl_eval(TALLOC_CTX *ctx, fr_value_box_list_t *out, request_t *request, tmpl_t const *vpt);
 
int                     tmpl_eval_cast_in_place(fr_value_box_list_t *out, request_t *request, tmpl_t const *vpt);
/** @} */
 
ssize_t                 tmpl_preparse(char const **out, size_t *outlen, char const *in, size_t inlen,
                                      fr_token_t *type,
                                      fr_dict_attr_t const **castda, bool require_regex,
                                      bool allow_xlat) CC_HINT(nonnull(1,2,3,5));
 
bool                    tmpl_async_required(tmpl_t const *vpt) CC_HINT(nonnull);
 
int                     tmpl_value_list_insert_tail(fr_value_box_list_t *list, fr_value_box_t *vb, tmpl_t const *vpt) CC_HINT(nonnull);
 
void                    tmpl_rules_child_init(TALLOC_CTX *ctx, tmpl_rules_t *out, tmpl_rules_t const *parent, tmpl_t *vpt) CC_HINT(nonnull);
 
void                    tmpl_rules_debug(tmpl_rules_t const *rules) CC_HINT(nonnull);
 
int                     tmpl_global_init(void);
void                    tmpl_global_free(void);
 
#undef _CONST
 
#ifdef __cplusplus
}
#endif