lib/ldb/ldb_map/ldb_map.h

   1 /*
   2    ldb database mapping module
   3
   4    Copyright (C) Jelmer Vernooij 2005
   5    Copyright (C) Martin Kuehl <mkhl@samba.org> 2006
   6
   7      ** NOTE! The following LGPL license applies to the ldb
   8      ** library. This does NOT imply that all of Samba is released
   9      ** under the LGPL
  10
  11    This library is free software; you can redistribute it and/or
  12    modify it under the terms of the GNU Lesser General Public
  13    License as published by the Free Software Foundation; either
  14    version 3 of the License, or (at your option) any later version.
  15
  16    This library is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19    Lesser General Public License for more details.
  20
  21    You should have received a copy of the GNU Lesser General Public
  22    License along with this library; if not, see <http://www.gnu.org/licenses/>.
  23
  24 */
  25
  26 #ifndef __LDB_MAP_H__
  27 #define __LDB_MAP_H__
  28
  29 #include "ldb_module.h"
  30
  31 /* ldb_map is a skeleton LDB module that can be used for any other modules
  32  * that need to map attributes.
  33  *
  34  * The term 'remote' in this header refers to the connection where the
  35  * original schema is used on while 'local' means the local connection
  36  * that any upper layers will use.
  37  *
  38  * All local attributes will have to have a definition. Not all remote
  39  * attributes need a definition as LDB is a lot less strict than LDAP
  40  * (in other words, sending unknown attributes to an LDAP server hurts us,
  41  * while returning too many attributes in ldb_search() doesn't)
  42  */
  43
  44
  45 /* Name of the internal attribute pointing from the local to the
  46  * remote part of a record */
  47 #define IS_MAPPED "isMapped"
  48
  49
  50 struct ldb_map_context;
  51
  52 /* convert a local ldb_val to a remote ldb_val */
  53 typedef struct ldb_val (*ldb_map_convert_func) (struct ldb_module *module, void *mem_ctx, const struct ldb_val *val);
  54
  55 #define LDB_MAP_MAX_REMOTE_NAMES 10
  56
  57 /* map from local to remote attribute */
  58 struct ldb_map_attribute {
  59         const char *local_name; /* local name */
  60
  61         enum ldb_map_attr_type {
  62                 LDB_MAP_IGNORE, /* Ignore this local attribute. Doesn't exist remotely.  */
  63                 LDB_MAP_KEEP,   /* Keep as is. Same name locally and remotely. */
  64                 LDB_MAP_RENAME, /* Simply rename the attribute. Name changes, data is the same */
  65                 LDB_MAP_CONVERT, /* Rename + convert data */
  66                 LDB_MAP_GENERATE /* Use generate function for generating new name/data.
  67                                                 Used for generating attributes based on
  68                                                 multiple remote attributes. */
  69         } type;
  70
  71         /* if set, will be called for search expressions that contain this attribute */
  72         int (*convert_operator)(struct ldb_module *, TALLOC_CTX *ctx, struct ldb_parse_tree **ntree, const struct ldb_parse_tree *otree);
  73
  74         union {
  75                 struct {
  76                         const char *remote_name;
  77                 } rename;
  78
  79                 struct {
  80                         const char *remote_name;
  81
  82                         /* Convert local to remote data */
  83                         ldb_map_convert_func convert_local;
  84
  85                         /* Convert remote to local data */
  86                         /* an entry can have convert_remote set to NULL, as long as there as an entry with the same local_name
  87                          * that is non-NULL before it. */
  88                         ldb_map_convert_func convert_remote;
  89                 } convert;
  90
  91                 struct {
  92                         /* Generate the local attribute from remote message */
  93                         struct ldb_message_element *(*generate_local)(struct ldb_module *, TALLOC_CTX *mem_ctx, const char *remote_attr, const struct ldb_message *remote);
  94
  95                         /* Update remote message with information from local message */
  96                         void (*generate_remote)(struct ldb_module *, const char *local_attr, const struct ldb_message *old, struct ldb_message *remote, struct ldb_message *local);
  97
  98                         /* Name(s) for this attribute on the remote server. This is an array since
  99                          * one local attribute's data can be split up into several attributes
 100                          * remotely */
 101                         const char *remote_names[LDB_MAP_MAX_REMOTE_NAMES];
 102
 103                         /* Names of additional remote attributes
 104                          * required for the generation.  NULL
 105                          * indicates that `local_attr' suffices. */
 106                         /*
 107 #define LDB_MAP_MAX_SELF_ATTRIBUTES 10
 108                         const char *self_attrs[LDB_MAP_MAX_SELF_ATTRIBUTES];
 109                         */
 110                 } generate;
 111         } u;
 112 };
 113
 114
 115 #define LDB_MAP_MAX_SUBCLASSES  10
 116 #define LDB_MAP_MAX_MUSTS               10
 117 #define LDB_MAP_MAX_MAYS                50
 118
 119 /* map from local to remote objectClass */
 120 struct ldb_map_objectclass {
 121         const char *local_name;
 122         const char *remote_name;
 123         const char *base_classes[LDB_MAP_MAX_SUBCLASSES];
 124         const char *musts[LDB_MAP_MAX_MUSTS];
 125         const char *mays[LDB_MAP_MAX_MAYS];
 126 };
 127
 128
 129 /* private context data */
 130 struct ldb_map_context {
 131         struct ldb_map_attribute *attribute_maps;
 132         /* NOTE: Always declare base classes first here */
 133         const struct ldb_map_objectclass *objectclass_maps;
 134
 135         /* Remote (often operational) attributes that should be added
 136          * to any wildcard search */
 137         const char * const *wildcard_attributes;
 138
 139         /* ObjectClass (if any) to be added to remote attributes on add */
 140         const char *add_objectclass;
 141
 142         /* struct ldb_context *mapped_ldb; */
 143         struct ldb_dn *local_base_dn;
 144         struct ldb_dn *remote_base_dn;
 145 };
 146
 147 /* Global private data */
 148 struct map_private {
 149         void *caller_private;
 150         struct ldb_map_context *context;
 151 };
 152
 153 /* Initialize global private data. */
 154 int ldb_map_init(struct ldb_module *module, const struct ldb_map_attribute *attrs,
 155                  const struct ldb_map_objectclass *ocls,
 156                  const char * const *wildcard_attributes,
 157                  const char *add_objectclass,
 158                  const char *name);
 159
 160 int ldb_map_add(struct ldb_module *module, struct ldb_request *req);
 161 int ldb_map_search(struct ldb_module *module, struct ldb_request *req);
 162 int ldb_map_rename(struct ldb_module *module, struct ldb_request *req);
 163 int ldb_map_delete(struct ldb_module *module, struct ldb_request *req);
 164 int ldb_map_modify(struct ldb_module *module, struct ldb_request *req);
 165
 166 #define LDB_MAP_OPS \
 167         .add            = ldb_map_add, \
 168         .modify         = ldb_map_modify, \
 169         .del            = ldb_map_delete, \
 170         .rename         = ldb_map_rename, \
 171         .search         = ldb_map_search,
 172
 173 #endif /* __LDB_MAP_H__ */