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Copyright (C) Andrew Tridgell 2005
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** NOTE! The following LGPL license applies to the ldb
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** library. This does NOT imply that all of Samba is released
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, see <http://www.gnu.org/licenses/>.
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register handlers for specific attributes and objectclass relationships
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this allows a backend to store its schema information in any format
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it likes (or to not have any schema information at all) while keeping the
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message matching logic generic
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#include "ldb_private.h"
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#include "ldb_handlers.h"
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add a attribute to the ldb_schema
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if flags contains LDB_ATTR_FLAG_ALLOCATED
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the attribute name string will be copied using
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talloc_strdup(), otherwise it needs to be a static const
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string at least with a lifetime longer than the ldb struct!
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the ldb_schema_syntax structure should be a pointer
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to a static const struct or at least it needs to be
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a struct with a longer lifetime than the ldb context!
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int ldb_schema_attribute_add_with_syntax(struct ldb_context *ldb,
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const char *attribute,
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const struct ldb_schema_syntax *syntax)
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struct ldb_schema_attribute *a;
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return LDB_ERR_OPERATIONS_ERROR;
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n = ldb->schema.num_attributes + 1;
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a = talloc_realloc(ldb, ldb->schema.attributes,
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struct ldb_schema_attribute, n);
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ldb->schema.attributes = a;
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for (i = 0; i < ldb->schema.num_attributes; i++) {
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int cmp = ldb_attr_cmp(attribute, a[i].name);
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/* silently ignore attempts to overwrite fixed attributes */
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if (a[i].flags & LDB_ATTR_FLAG_FIXED) {
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if (a[i].flags & LDB_ATTR_FLAG_ALLOCATED) {
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talloc_free(discard_const_p(char, a[i].name));
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/* To cancel out increment below */
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ldb->schema.num_attributes--;
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memmove(a+i+1, a+i, sizeof(*a) * (ldb->schema.num_attributes-i));
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ldb->schema.num_attributes++;
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a[i].name = attribute;
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if (a[i].flags & LDB_ATTR_FLAG_ALLOCATED) {
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a[i].name = talloc_strdup(a, a[i].name);
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if (a[i].name == NULL) {
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static const struct ldb_schema_syntax ldb_syntax_default = {
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.name = LDB_SYNTAX_OCTET_STRING,
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.ldif_read_fn = ldb_handler_copy,
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.ldif_write_fn = ldb_handler_copy,
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.canonicalise_fn = ldb_handler_copy,
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.comparison_fn = ldb_comparison_binary
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static const struct ldb_schema_attribute ldb_attribute_default = {
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.syntax = &ldb_syntax_default
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return the attribute handlers for a given attribute
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const struct ldb_schema_attribute *ldb_schema_attribute_by_name(struct ldb_context *ldb,
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const struct ldb_schema_attribute *def = &ldb_attribute_default;
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/* as handlers are sorted, '*' must be the first if present */
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if (strcmp(ldb->schema.attributes[0].name, "*") == 0) {
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def = &ldb->schema.attributes[0];
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/* do a binary search on the array */
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e = ldb->schema.num_attributes - 1;
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r = ldb_attr_cmp(name, ldb->schema.attributes[i].name);
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return &ldb->schema.attributes[i];
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add to the list of ldif handlers for this ldb context
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void ldb_schema_attribute_remove(struct ldb_context *ldb, const char *name)
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const struct ldb_schema_attribute *a;
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a = ldb_schema_attribute_by_name(ldb, name);
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if (a == NULL || a->name == NULL) {
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/* FIXED attributes are never removed */
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if (a->flags & LDB_ATTR_FLAG_FIXED) {
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if (a->flags & LDB_ATTR_FLAG_ALLOCATED) {
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talloc_free(discard_const_p(char, a->name));
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i = a - ldb->schema.attributes;
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if (i < ldb->schema.num_attributes - 1) {
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memmove(&ldb->schema.attributes[i],
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a+1, sizeof(*a) * (ldb->schema.num_attributes-(i+1)));
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ldb->schema.num_attributes--;
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setup a attribute handler using a standard syntax
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int ldb_schema_attribute_add(struct ldb_context *ldb,
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const char *attribute,
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const struct ldb_schema_syntax *s = ldb_standard_syntax_by_name(ldb, syntax);
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return ldb_schema_attribute_add_with_syntax(ldb, attribute, flags, s);
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setup the attribute handles for well known attributes
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int ldb_setup_wellknown_attributes(struct ldb_context *ldb)
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{ "dn", LDB_SYNTAX_DN },
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{ "distinguishedName", LDB_SYNTAX_DN },
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{ "cn", LDB_SYNTAX_DIRECTORY_STRING },
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{ "dc", LDB_SYNTAX_DIRECTORY_STRING },
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{ "ou", LDB_SYNTAX_DIRECTORY_STRING },
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{ "objectClass", LDB_SYNTAX_OBJECTCLASS }
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for (i=0;i<ARRAY_SIZE(wellknown);i++) {
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ret = ldb_schema_attribute_add(ldb, wellknown[i].attr, 0,
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wellknown[i].syntax);
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if (ret != LDB_SUCCESS) {
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add a extended dn syntax to the ldb_schema
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int ldb_dn_extended_add_syntax(struct ldb_context *ldb,
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const struct ldb_dn_extended_syntax *syntax)
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struct ldb_dn_extended_syntax *a;
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return LDB_ERR_OPERATIONS_ERROR;
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n = ldb->schema.num_dn_extended_syntax + 1;
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a = talloc_realloc(ldb, ldb->schema.dn_extended_syntax,
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struct ldb_dn_extended_syntax, n);
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return LDB_ERR_OPERATIONS_ERROR;
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a[ldb->schema.num_dn_extended_syntax] = *syntax;
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ldb->schema.dn_extended_syntax = a;
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ldb->schema.num_dn_extended_syntax = n;
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return the extended dn syntax for a given name
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const struct ldb_dn_extended_syntax *ldb_dn_extended_syntax_by_name(struct ldb_context *ldb,
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for (i=0; i < ldb->schema.num_dn_extended_syntax; i++) {
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if (ldb_attr_cmp(ldb->schema.dn_extended_syntax[i].name, name) == 0) {
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return &ldb->schema.dn_extended_syntax[i];