root/source4/lib/ldb/common/ldb_attributes.c

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DEFINITIONS

This source file includes following definitions.
  1. ldb_schema_attribute_add_with_syntax
  2. ldb_schema_attribute_by_name
  3. ldb_schema_attribute_remove
  4. ldb_schema_attribute_add
  5. ldb_setup_wellknown_attributes
  6. ldb_dn_extended_add_syntax
  7. ldb_dn_extended_syntax_by_name

   1 /* 
   2    ldb database library
   3 
   4    Copyright (C) Andrew Tridgell  2005
   5 
   6      ** NOTE! The following LGPL license applies to the ldb
   7      ** library. This does NOT imply that all of Samba is released
   8      ** under the LGPL
   9    
  10    This library is free software; you can redistribute it and/or
  11    modify it under the terms of the GNU Lesser General Public
  12    License as published by the Free Software Foundation; either
  13    version 3 of the License, or (at your option) any later version.
  14 
  15    This library is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    Lesser General Public License for more details.
  19 
  20    You should have received a copy of the GNU Lesser General Public
  21    License along with this library; if not, see <http://www.gnu.org/licenses/>.
  22 */
  23 /*
  24   register handlers for specific attributes and objectclass relationships
  25 
  26   this allows a backend to store its schema information in any format
  27   it likes (or to not have any schema information at all) while keeping the 
  28   message matching logic generic
  29 */
  30 
  31 #include "ldb_private.h"
  32 #include "ldb_handlers.h"
  33 
  34 /*
  35   add a attribute to the ldb_schema
  36 
  37   if flags contains LDB_ATTR_FLAG_ALLOCATED
  38   the attribute name string will be copied using
  39   talloc_strdup(), otherwise it needs to be a static const
  40   string at least with a lifetime longer than the ldb struct!
  41   
  42   the ldb_schema_syntax structure should be a pointer
  43   to a static const struct or at least it needs to be
  44   a struct with a longer lifetime than the ldb context!
  45 
  46 */
  47 int ldb_schema_attribute_add_with_syntax(struct ldb_context *ldb, 
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  48                                          const char *attribute,
  49                                          unsigned flags,
  50                                          const struct ldb_schema_syntax *syntax)
  51 {
  52         int i, n;
  53         struct ldb_schema_attribute *a;
  54 
  55         if (!syntax) {
  56                 return LDB_ERR_OPERATIONS_ERROR;
  57         }
  58 
  59         n = ldb->schema.num_attributes + 1;
  60 
  61         a = talloc_realloc(ldb, ldb->schema.attributes,
  62                            struct ldb_schema_attribute, n);
  63         if (a == NULL) {
  64                 ldb_oom(ldb);
  65                 return -1;
  66         }
  67         ldb->schema.attributes = a;
  68 
  69         for (i = 0; i < ldb->schema.num_attributes; i++) {
  70                 int cmp = ldb_attr_cmp(attribute, a[i].name);
  71                 if (cmp == 0) {
  72                         /* silently ignore attempts to overwrite fixed attributes */
  73                         if (a[i].flags & LDB_ATTR_FLAG_FIXED) {
  74                                 return 0;
  75                         }
  76                         if (a[i].flags & LDB_ATTR_FLAG_ALLOCATED) {
  77                                 talloc_free(discard_const_p(char, a[i].name));
  78                         }
  79                         /* To cancel out increment below */
  80                         ldb->schema.num_attributes--;
  81                         break;
  82                 } else if (cmp < 0) {
  83                         memmove(a+i+1, a+i, sizeof(*a) * (ldb->schema.num_attributes-i));
  84                         break;
  85                 }
  86         }
  87         ldb->schema.num_attributes++;
  88 
  89         a[i].name       = attribute;
  90         a[i].flags      = flags;
  91         a[i].syntax     = syntax;
  92 
  93         if (a[i].flags & LDB_ATTR_FLAG_ALLOCATED) {
  94                 a[i].name = talloc_strdup(a, a[i].name);
  95                 if (a[i].name == NULL) {
  96                         ldb_oom(ldb);
  97                         return -1;
  98                 }
  99         }
 100 
 101         return 0;
 102 }
 103 
 104 static const struct ldb_schema_syntax ldb_syntax_default = {
 105         .name            = LDB_SYNTAX_OCTET_STRING,
 106         .ldif_read_fn    = ldb_handler_copy,
 107         .ldif_write_fn   = ldb_handler_copy,
 108         .canonicalise_fn = ldb_handler_copy,
 109         .comparison_fn   = ldb_comparison_binary
 110 };
 111 
 112 static const struct ldb_schema_attribute ldb_attribute_default = {
 113         .name   = NULL,
 114         .flags  = 0,
 115         .syntax = &ldb_syntax_default
 116 };
 117 
 118 /*
 119   return the attribute handlers for a given attribute
 120 */
 121 const struct ldb_schema_attribute *ldb_schema_attribute_by_name(struct ldb_context *ldb,
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 122                                                                 const char *name)
 123 {
 124         int i, e, b = 0, r;
 125         const struct ldb_schema_attribute *def = &ldb_attribute_default;
 126 
 127         /* as handlers are sorted, '*' must be the first if present */
 128         if (strcmp(ldb->schema.attributes[0].name, "*") == 0) {
 129                 def = &ldb->schema.attributes[0];
 130                 b = 1;
 131         }
 132 
 133         /* do a binary search on the array */
 134         e = ldb->schema.num_attributes - 1;
 135 
 136         while (b <= e) {
 137 
 138                 i = (b + e) / 2;
 139 
 140                 r = ldb_attr_cmp(name, ldb->schema.attributes[i].name);
 141                 if (r == 0) {
 142                         return &ldb->schema.attributes[i];
 143                 }
 144                 if (r < 0) {
 145                         e = i - 1;
 146                 } else {
 147                         b = i + 1;
 148                 }
 149 
 150         }
 151 
 152         return def;
 153 }
 154 
 155 
 156 /*
 157   add to the list of ldif handlers for this ldb context
 158 */
 159 void ldb_schema_attribute_remove(struct ldb_context *ldb, const char *name)
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 160 {
 161         const struct ldb_schema_attribute *a;
 162         int i;
 163 
 164         a = ldb_schema_attribute_by_name(ldb, name);
 165         if (a == NULL || a->name == NULL) {
 166                 return;
 167         }
 168 
 169         /* FIXED attributes are never removed */
 170         if (a->flags & LDB_ATTR_FLAG_FIXED) {
 171                 return;
 172         }
 173 
 174         if (a->flags & LDB_ATTR_FLAG_ALLOCATED) {
 175                 talloc_free(discard_const_p(char, a->name));
 176         }
 177 
 178         i = a - ldb->schema.attributes;
 179         if (i < ldb->schema.num_attributes - 1) {
 180                 memmove(&ldb->schema.attributes[i], 
 181                         a+1, sizeof(*a) * (ldb->schema.num_attributes-(i+1)));
 182         }
 183 
 184         ldb->schema.num_attributes--;
 185 }
 186 
 187 /*
 188   setup a attribute handler using a standard syntax
 189 */
 190 int ldb_schema_attribute_add(struct ldb_context *ldb,
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 191                              const char *attribute,
 192                              unsigned flags,
 193                              const char *syntax)
 194 {
 195         const struct ldb_schema_syntax *s = ldb_standard_syntax_by_name(ldb, syntax);
 196         return ldb_schema_attribute_add_with_syntax(ldb, attribute, flags, s);
 197 }
 198 
 199 /*
 200   setup the attribute handles for well known attributes
 201 */
 202 int ldb_setup_wellknown_attributes(struct ldb_context *ldb)
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 203 {
 204         const struct {
 205                 const char *attr;
 206                 const char *syntax;
 207         } wellknown[] = {
 208                 { "dn", LDB_SYNTAX_DN },
 209                 { "distinguishedName", LDB_SYNTAX_DN },
 210                 { "cn", LDB_SYNTAX_DIRECTORY_STRING },
 211                 { "dc", LDB_SYNTAX_DIRECTORY_STRING },
 212                 { "ou", LDB_SYNTAX_DIRECTORY_STRING },
 213                 { "objectClass", LDB_SYNTAX_OBJECTCLASS }
 214         };
 215         int i;
 216         int ret;
 217 
 218         for (i=0;i<ARRAY_SIZE(wellknown);i++) {
 219                 ret = ldb_schema_attribute_add(ldb, wellknown[i].attr, 0,
 220                                                wellknown[i].syntax);
 221                 if (ret != LDB_SUCCESS) {
 222                         return ret;
 223                 }
 224         }
 225 
 226         return LDB_SUCCESS;
 227 }
 228 
 229 
 230 /*
 231   add a extended dn syntax to the ldb_schema
 232 */
 233 int ldb_dn_extended_add_syntax(struct ldb_context *ldb, 
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 234                                unsigned flags,
 235                                const struct ldb_dn_extended_syntax *syntax)
 236 {
 237         int n;
 238         struct ldb_dn_extended_syntax *a;
 239 
 240         if (!syntax) {
 241                 return LDB_ERR_OPERATIONS_ERROR;
 242         }
 243 
 244         n = ldb->schema.num_dn_extended_syntax + 1;
 245 
 246         a = talloc_realloc(ldb, ldb->schema.dn_extended_syntax,
 247                            struct ldb_dn_extended_syntax, n);
 248 
 249         if (!a) {
 250                 return LDB_ERR_OPERATIONS_ERROR;
 251         }
 252 
 253         a[ldb->schema.num_dn_extended_syntax] = *syntax;
 254         ldb->schema.dn_extended_syntax = a;
 255 
 256         ldb->schema.num_dn_extended_syntax = n;
 257 
 258         return LDB_SUCCESS;
 259 }
 260 
 261 /*
 262   return the extended dn syntax for a given name
 263 */
 264 const struct ldb_dn_extended_syntax *ldb_dn_extended_syntax_by_name(struct ldb_context *ldb,
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 265                                                                     const char *name)
 266 {
 267         int i;
 268         for (i=0; i < ldb->schema.num_dn_extended_syntax; i++) {
 269                 if (ldb_attr_cmp(ldb->schema.dn_extended_syntax[i].name, name) == 0) {
 270                         return &ldb->schema.dn_extended_syntax[i];
 271                 }
 272         }
 273         return NULL;
 274 }
 275 

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