dict_priv.h

Go to the documentation of this file.

#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
 */
 
/** Private Multi-protocol AVP dictionary API
 *
 * @file src/lib/util/dict_priv.h
 *
 * @copyright 2019 The FreeRADIUS server project
 */
#ifdef __cplusplus
extern "C" {
#endif
 
#define _DICT_PRIVATE 1
 
#include <freeradius-devel/protocol/base.h>
#include <freeradius-devel/util/dict.h>
#include <freeradius-devel/util/dict_ext_priv.h>
#include <freeradius-devel/util/dl.h>
#include <freeradius-devel/util/hash.h>
#include <freeradius-devel/util/value.h>
 
#define DICT_POOL_SIZE          (1024 * 1024 * 2)
#define DICT_FIXUP_POOL_SIZE    (1024)
 
/** Set the internal dictionary if none was provided
 *
 * @param _dict         Dict pointer to check/set.
 * @param _ret          Value to return if no dictionaries are available.
 */
#define INTERNAL_IF_NULL(_dict, _ret) \
        do { \
                if (!(_dict)) { \
                        _dict = dict_gctx ? dict_gctx->internal : NULL; \
                        if (unlikely(!(_dict))) { \
                                fr_strerror_const("No dictionaries available for attribute resolution"); \
                                return (_ret); \
                        } \
                } \
        } while (0)
 
/** Entry recording dictionary reference holders by file
 */
typedef struct {
        fr_rb_node_t            node;
        int                     count;                  //!< How many references are held by this file.
                                                        ///< Signed to help figure out when things go wrong...
        char const              *dependent;             //!< File holding the reference.
} fr_dict_dependent_t;
 
/** Entry in the filename list of files associated with this dictionary
 *
 * Mainly used for debugging.
 */
typedef struct {
        fr_dlist_t              entry;                  //!< Entry in the list of filenames.
 
        char const              *src_file;              //!< the source file which did the $INCLUDE
        int                     src_line;               //!< the line number in the source file
        char                    *filename;              //!< Name of the file the dictionary was loaded on.
} fr_dict_filename_t;
 
/** Vendors and attribute names
 *
 * It's very likely that the same vendors will operate in multiple
 * protocol spaces, but number their attributes differently, so we need
 * per protocol dictionaries.
 *
 * There would also be conflicts for DHCP(v6)/RADIUS attributes etc...
 */
struct fr_dict_s {
        fr_dict_gctx_t          *gctx;                  //!< Global dictionary context this dictionary
                                                        ///< was allocated in.
 
        char const              *dir;                   //!< where this protocol is located
 
        fr_dlist_head_t         filenames;              //!< Files that this dictionary was loaded from.
 
        bool                    read_only;              //!< If true, disallow modifications.
 
        bool                    in_protocol_by_name;    //!< Whether the dictionary has been inserted into the
                                                        ///< protocol_by_name hash.
        bool                    in_protocol_by_num;     //!< Whether the dictionary has been inserted into the
                                                        //!< protocol_by_num table.
 
        bool                    string_based;           //!< TACACS, etc.
 
        bool                    loading;                //!< from fr_dict_protocol_afrom_file();
 
        bool                    loaded;                 //!< from fr_dict_protocol_afrom_file();
 
        fr_hash_table_t         *vendors_by_name;       //!< Lookup vendor by name.
        fr_hash_table_t         *vendors_by_num;        //!< Lookup vendor by PEN.
 
        fr_dict_attr_t          *root;                  //!< Root attribute of this dictionary.
 
        TALLOC_CTX              *pool;                  //!< Talloc memory pool to reduce allocs.
                                                        ///< in the dictionary.
 
        fr_hash_table_t         *autoref;               //!< other dictionaries that we loaded via references
 
        fr_dict_t const         *next;                  //!< for attribute overloading
 
        unsigned int            vsa_parent;             //!< varies with different protocols.
 
        fr_dict_attr_t          **fixups;               //!< Attributes that need fixing up.
 
        fr_rb_tree_t            *dependents;            //!< Which files are using this dictionary.
 
        dl_t                    *dl;                    //!< for validation
 
        fr_dict_protocol_t const *proto;                //!< protocol-specific validation functions
};
 
struct fr_dict_gctx_s {
        bool                    free_at_exit;           //!< This gctx will be freed on exit.
 
        bool                    perm_check;             //!< Whether we should check dictionary
                                                        ///< file permissions as they're loaded.
 
        bool                    read_only;
 
        char                    *dict_dir_default;      //!< The default location for loading dictionaries if one
                                                        ///< wasn't provided.
 
        dl_loader_t             *dict_loader;           //!< for protocol validation
 
        fr_hash_table_t         *protocol_by_name;      //!< Hash containing names of all the
                                                        ///< registered protocols.
        fr_hash_table_t         *protocol_by_num;       //!< Hash containing numbers of all the
                                                        ///< registered protocols.
 
        /** Magic internal dictionary
         *
         * Internal dictionary is checked in addition to the protocol dictionary
         * when resolving attribute names.
         *
         * This is because internal attributes are valid for every
         * protocol.
         */
        fr_dict_t               *internal;
 
        fr_dict_attr_t const    *attr_protocol_encapsulation;
};
 
typedef enum {
        FR_DICT_PROTO_RADIUS = 1,
        FR_DICT_PROTO_DHCPv4 = 2,
        FR_DICT_PROTO_DHCPv6 = 3,
        FR_DICT_PROTO_ETHERNET = 4,
        FR_DICT_PROTO_TACACS = 5,
        FR_DICT_PROTO_VMPS = 6,
        FR_DICT_PROTO_SNMP = 7,
        FR_DICT_PROTO_ARP = 8,
        FR_DICT_PROTO_TFTP = 9,
        FR_DICT_PROTO_TLS = 10,
        FR_DICT_PROTO_DNS = 11,
        FR_DICT_PROTO_LDAP = 12,
        FR_DICT_PROTO_BFD = 13,
} fr_dict_protocol_id_t;
 
extern fr_dict_gctx_t *dict_gctx;
 
bool                    dict_has_dependents(fr_dict_t *dict);
 
int                     dict_dependent_add(fr_dict_t *dict, char const *dependent);
 
int                     dict_dependent_remove(fr_dict_t *dict, char const *dependent);
 
fr_dict_t               *dict_alloc(TALLOC_CTX *ctx);
 
int                     dict_dlopen(fr_dict_t *dict, char const *name);
 
/** Optional arguments for initialising/allocating attributes
 *
 */
typedef struct {
        fr_dict_attr_flags_t const      *flags;         //!< Any flags to assign to the attribute.
 
        fr_dict_attr_t const            *ref;           //!< This attribute is a reference to another attribute.
} dict_attr_args_t;
 
/** Partial initialisation functions
 *
 * These functions are used to initialise attributes in stages, i.e. when parsing a dictionary.
 *
 * The finalise function must be called to complete the initialisation.
 *
 * All functions must be called to fully initialise a dictionary attribute, except
 * #dict_attr_parent_init this is not necessary for root attributes.
 *
 * @{
 */
fr_dict_attr_t          *dict_attr_alloc_null(TALLOC_CTX *ctx, fr_dict_protocol_t const *dict);
 
int                     dict_attr_type_init(fr_dict_attr_t **da_p, fr_type_t type);
 
int                     dict_attr_parent_init(fr_dict_attr_t **da_p, fr_dict_attr_t const *parent);
 
int                     dict_attr_num_init(fr_dict_attr_t *da, unsigned int num);
 
int                     dict_attr_num_init_name_only(fr_dict_attr_t *da);
 
void                    dict_attr_location_init(fr_dict_attr_t *da, char const *filename, int line);
 
int                     dict_attr_finalise(fr_dict_attr_t **da_p, char const *name);
/** @} */
 
/** Full initialisation functions
 *
 * These functions either initialise, or allocate and then initialise a
 * complete dictionary attribute.
 *
 * The output of these functions can be added into a dictionary immediately
 * @{
 */
#define                 dict_attr_init(_da_p, _parent, _name, _attr, _type, _args) \
                                       _dict_attr_init(__FILE__, __LINE__, _da_p, _parent, _name, _attr, _type, _args)
 
int                     _dict_attr_init(char const *filename, int line,
                                        fr_dict_attr_t **da_p, fr_dict_attr_t const *parent,
                                        char const *name, unsigned int attr,
                                        fr_type_t type, dict_attr_args_t const *args) CC_HINT(nonnull(1));
 
#define                 dict_attr_init_name_only(_da_p, _parent, _name, _type, _args) \
                                            _dict_attr_init_name_only(__FILE__, __LINE__, _da_p, _parent, _name,  _type, _args)
 
int                     _dict_attr_init_name_only(char const *filename, int line,
                                             fr_dict_attr_t **da_p, fr_dict_attr_t const *parent,
                                             char const *name,
                                             fr_type_t type, dict_attr_args_t const *args) CC_HINT(nonnull(1));
 
#define                 dict_attr_alloc_root(_ctx, _dict, _name, _attr, _args) \
                                             _dict_attr_alloc_root(__FILE__, __LINE__, _ctx, _dict, _name, _attr, _args)
fr_dict_attr_t          *_dict_attr_alloc_root(char const *filename, int line,
                                               TALLOC_CTX *ctx,
                                               fr_dict_t const *dict,
                                               char const *name, int attr,
                                               dict_attr_args_t const *args) CC_HINT(nonnull(4,5));
 
#define                 dict_attr_alloc(_ctx, _parent, _name, _attr, _type, _args) \
                                _dict_attr_alloc(__FILE__, __LINE__, _ctx, _parent, _name, _attr, _type, (_args))
fr_dict_attr_t          *_dict_attr_alloc(char const *filename, int line,
                                          TALLOC_CTX *ctx,
                                          fr_dict_attr_t const *parent,
                                          char const *name, int attr,
                                          fr_type_t type, dict_attr_args_t const *args) CC_HINT(nonnull(4));
/** @} */
 
fr_dict_attr_t          *dict_attr_acopy(TALLOC_CTX *ctx, fr_dict_attr_t const *parent, fr_dict_attr_t const *in, char const *new_name);
 
int                     dict_attr_acopy_children(fr_dict_t *dict, fr_dict_attr_t *dst, fr_dict_attr_t const *src);
 
int                     dict_attr_acopy_enumv(fr_dict_attr_t *dst, fr_dict_attr_t const *src);
 
int                     dict_attr_acopy_aliases(fr_dict_attr_t *dst, fr_dict_attr_t const *src);
 
int                     dict_attr_alias_add(fr_dict_attr_t const *parent, char const *alias, fr_dict_attr_t const *ref);
 
int                     dict_attr_child_add(fr_dict_attr_t *parent, fr_dict_attr_t *child);
 
int                     dict_protocol_add(fr_dict_t *dict);
 
int                     dict_vendor_add(fr_dict_t *dict, char const *name, unsigned int num);
 
int                     dict_attr_add_to_namespace(fr_dict_attr_t const *parent, fr_dict_attr_t *da) CC_HINT(nonnull);
 
bool                    dict_attr_flags_valid(fr_dict_attr_t *da) CC_HINT(nonnull(1));
 
bool                    dict_attr_valid(fr_dict_attr_t *da);
 
fr_dict_attr_t          *dict_attr_by_name(fr_dict_attr_err_t *err, fr_dict_attr_t const *parent, char const *name);
 
fr_dict_attr_t          *dict_attr_child_by_num(fr_dict_attr_t const *parent, unsigned int attr);
 
fr_slen_t               dict_by_protocol_substr(fr_dict_attr_err_t *err,
                                                fr_dict_t **out, fr_sbuff_t *name, fr_dict_t const *dict_def);
 
fr_dict_t               *dict_by_protocol_name(char const *name);
 
fr_dict_t               *dict_by_protocol_num(unsigned int num);
 
fr_dict_t               *dict_by_da(fr_dict_attr_t const *da);
 
bool                    dict_attr_can_have_children(fr_dict_attr_t const *da);
 
int                     dict_attr_enum_add_name(fr_dict_attr_t *da, char const *name, fr_value_box_t const *value,
                                           bool coerce, bool replace, fr_dict_attr_t const *child_struct);
 
#ifdef __cplusplus
}
#endif