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/*
ldb database library
Copyright (C) Andrew Tridgell 2005
** NOTE! The following LGPL license applies to the ldb
** library. This does NOT imply that all of Samba is released
** under the LGPL
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
/*
register handlers for specific attributes and objectclass relationships
this allows a backend to store its schema information in any format
it likes (or to not have any schema information at all) while keeping the
message matching logic generic
*/
#include "ldb_includes.h"
/*
add a attribute to the ldb_schema
if flags contains LDB_ATTR_FLAG_ALLOCATED
the attribute name string will be copied using
talloc_strdup(), otherwise it needs to be a static const
string at least with a lifetime longer than the ldb struct!
the ldb_schema_syntax structure should be a pointer
to a static const struct or at least it needs to be
a struct with a longer lifetime than the ldb context!
*/
int ldb_schema_attribute_add_with_syntax(struct ldb_context *ldb,
const char *attribute,
unsigned flags,
const struct ldb_schema_syntax *syntax)
{
int i, n;
struct ldb_schema_attribute *a;
n = ldb->schema.num_attributes + 1;
a = talloc_realloc(ldb, ldb->schema.attributes,
struct ldb_schema_attribute, n);
if (a == NULL) {
ldb_oom(ldb);
return -1;
}
ldb->schema.attributes = a;
for (i = 0; i < ldb->schema.num_attributes; i++) {
int cmp = ldb_attr_cmp(attribute, a[i].name);
if (cmp == 0) {
/* silently ignore attempts to overwrite fixed attributes */
if (a[i].flags & LDB_ATTR_FLAG_FIXED) {
return 0;
}
if (a[i].flags & LDB_ATTR_FLAG_ALLOCATED) {
talloc_free(discard_const_p(char, a[i].name));
}
/* To cancel out increment below */
ldb->schema.num_attributes--;
break;
} else if (cmp < 0) {
memmove(a+i+1, a+i, sizeof(*a) * (ldb->schema.num_attributes-i));
break;
}
}
ldb->schema.num_attributes++;
a[i].name = attribute;
a[i].flags = flags;
a[i].syntax = syntax;
if (a[i].flags & LDB_ATTR_FLAG_ALLOCATED) {
a[i].name = talloc_strdup(a, a[i].name);
if (a[i].name == NULL) {
ldb_oom(ldb);
return -1;
}
}
return 0;
}
static const struct ldb_schema_syntax ldb_syntax_default = {
.name = LDB_SYNTAX_OCTET_STRING,
.ldif_read_fn = ldb_handler_copy,
.ldif_write_fn = ldb_handler_copy,
.canonicalise_fn = ldb_handler_copy,
.comparison_fn = ldb_comparison_binary
};
static const struct ldb_schema_attribute ldb_attribute_default = {
.name = NULL,
.flags = 0,
.syntax = &ldb_syntax_default
};
/*
return the attribute handlers for a given attribute
*/
const struct ldb_schema_attribute *ldb_schema_attribute_by_name(struct ldb_context *ldb,
const char *name)
{
int i, e, b = 0, r;
const struct ldb_schema_attribute *def = &ldb_attribute_default;
/* as handlers are sorted, '*' must be the first if present */
if (strcmp(ldb->schema.attributes[0].name, "*") == 0) {
def = &ldb->schema.attributes[0];
b = 1;
}
/* do a binary search on the array */
e = ldb->schema.num_attributes - 1;
while (b <= e) {
i = (b + e) / 2;
r = ldb_attr_cmp(name, ldb->schema.attributes[i].name);
if (r == 0) {
return &ldb->schema.attributes[i];
}
if (r < 0) {
e = i - 1;
} else {
b = i + 1;
}
}
return def;
}
/*
add to the list of ldif handlers for this ldb context
*/
void ldb_schema_attribute_remove(struct ldb_context *ldb, const char *name)
{
const struct ldb_schema_attribute *a;
int i;
a = ldb_schema_attribute_by_name(ldb, name);
if (a == NULL || a->name == NULL) {
return;
}
/* FIXED attributes are never removed */
if (a->flags & LDB_ATTR_FLAG_FIXED) {
return;
}
if (a->flags & LDB_ATTR_FLAG_ALLOCATED) {
talloc_free(discard_const_p(char, a->name));
}
i = a - ldb->schema.attributes;
if (i < ldb->schema.num_attributes - 1) {
memmove(&ldb->schema.attributes[i],
a+1, sizeof(*a) * (ldb->schema.num_attributes-(i+1)));
}
ldb->schema.num_attributes--;
}
/*
setup a attribute handler using a standard syntax
*/
int ldb_schema_attribute_add(struct ldb_context *ldb,
const char *attribute,
unsigned flags,
const char *syntax)
{
const struct ldb_schema_syntax *s = ldb_standard_syntax_by_name(ldb, syntax);
return ldb_schema_attribute_add_with_syntax(ldb, attribute, flags, s);
}
/*
setup the attribute handles for well known attributes
*/
int ldb_setup_wellknown_attributes(struct ldb_context *ldb)
{
const struct {
const char *attr;
const char *syntax;
} wellknown[] = {
{ "dn", LDB_SYNTAX_DN },
{ "distinguishedName", LDB_SYNTAX_DN },
{ "cn", LDB_SYNTAX_DIRECTORY_STRING },
{ "dc", LDB_SYNTAX_DIRECTORY_STRING },
{ "ou", LDB_SYNTAX_DIRECTORY_STRING },
{ "objectClass", LDB_SYNTAX_OBJECTCLASS }
};
int i;
int ret;
for (i=0;i<ARRAY_SIZE(wellknown);i++) {
ret = ldb_schema_attribute_add(ldb, wellknown[i].attr, 0,
wellknown[i].syntax);
if (ret != LDB_SUCCESS) {
return ret;
}
}
return LDB_SUCCESS;
}
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