r9595: Add ldb map module

source/lib/ldb/ldb_map/ldb_map.c

@@ -0,0 +1,238 @@
+/* 
+   ldb database library - map backend
+
+   Copyright (C) Jelmer Vernooij 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 2 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, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+#include "includes.h"
+#include "lib/ldb/include/ldb.h"
+#include "lib/ldb/include/ldb_private.h"
+#include "lib/ldb/ldb_map/ldb_map.h"
+
+struct map_private {
+	struct ldb_map_mappings *mappings;
+};
+
+static struct ldb_dn *ldb_map_dn(struct ldb_module *module, const struct ldb_dn *dn)
+{
+	/* FIXME */
+	return NULL;
+}
+
+static char *ldb_map_expression(struct ldb_module *module, const char *expr)
+{
+	/* FIXME */
+	return NULL;
+}
+
+static const char **ldb_map_attrs(struct ldb_module *module, const char *const attrs[])
+{
+	/* FIXME */
+	return NULL;
+}
+
+static struct ldb_message *ldb_map_message_incoming(struct ldb_module *module, const struct ldb_message *mi)
+{
+	/* FIXME */
+	return NULL;
+}
+
+static struct ldb_message *ldb_map_message_outgoing(struct ldb_module *module, const struct ldb_message *mi)
+{
+	/* FIXME */
+	return NULL;
+}
+
+/*
+  rename a record
+*/
+static int map_rename(struct ldb_module *module, const struct ldb_dn *olddn, const struct ldb_dn *newdn)
+{
+	struct ldb_dn *n_olddn, *n_newdn;
+	int ret;
+	
+	n_olddn = ldb_map_dn(module, olddn);
+	n_newdn = ldb_map_dn(module, newdn);
+
+	ret = ldb_next_rename_record(module, n_olddn, n_newdn);
+
+	talloc_free(n_olddn);
+	talloc_free(n_newdn);
+	
+	return ret;
+}
+
+/*
+  delete a record
+*/
+static int map_delete(struct ldb_module *module, const struct ldb_dn *dn)
+{
+	struct ldb_dn *newdn;
+	int ret;
+
+	newdn = ldb_map_dn(module, dn);
+
+	ret = ldb_next_delete_record(module, newdn);
+
+	talloc_free(newdn);
+
+	return ret;
+}
+
+
+/*
+  search for matching records
+*/
+static int map_search(struct ldb_module *module, const struct ldb_dn *base,
+		       enum ldb_scope scope, const char *expression,
+		       const char * const *attrs, struct ldb_message ***res)
+{
+	char *newexpr;
+	int ret;
+	const char **newattrs;
+	struct ldb_dn *new_base;
+	struct ldb_message **newres;
+	int i;
+
+	newexpr = ldb_map_expression(module, expression);
+	newattrs = ldb_map_attrs(module, attrs); 
+	new_base = ldb_map_dn(module, base);
+
+	ret = ldb_next_search(module, new_base, scope, newexpr, newattrs, &newres);
+
+	talloc_free(new_base);
+	talloc_free(newexpr);
+	talloc_free(newattrs);
+
+	for (i = 0; i < ret; i++) {
+		*res[i] = ldb_map_message_incoming(module, newres[i]);
+		talloc_free(newres[i]);
+	}
+
+	return ret;
+}
+
+/*
+  add a record
+*/
+static int map_add(struct ldb_module *module, const struct ldb_message *msg)
+{
+	struct ldb_message *nmsg = ldb_map_message_outgoing(module, msg);
+	int ret;
+
+	ret = ldb_next_add_record(module, nmsg);
+
+	talloc_free(nmsg);
+
+	return ret;
+}
+
+
+/*
+  search for matching records using a ldb_parse_tree
+*/
+static int map_search_bytree(struct ldb_module *module, const struct ldb_dn *base,
+			      enum ldb_scope scope, struct ldb_parse_tree *tree,
+			      const char * const *attrs, struct ldb_message ***res)
+{
+	struct map_private *privdat = module->private_data;
+	char *expression;
+	int ret;
+
+	expression = ldb_filter_from_tree(privdat, tree);
+	if (expression == NULL) {
+		return -1;
+	}
+	ret = map_search(module, base, scope, expression, attrs, res);
+	talloc_free(expression);
+	return ret;
+}
+
+/*
+  modify a record
+*/
+static int map_modify(struct ldb_module *module, const struct ldb_message *msg)
+{
+	struct ldb_message *nmsg = ldb_map_message_outgoing(module, msg);
+	int ret;
+
+	ret = ldb_next_modify_record(module, nmsg);
+
+	talloc_free(nmsg);
+
+	return ret;
+}
+
+static int map_lock(struct ldb_module *module, const char *lockname)
+{
+	return ldb_next_named_lock(module, lockname);
+}
+
+static int map_unlock(struct ldb_module *module, const char *lockname)
+{
+	return ldb_next_named_unlock(module, lockname);
+}
+
+/*
+  return extended error information
+*/
+static const char *map_errstring(struct ldb_module *module)
+{
+	return ldb_next_errstring(module);
+}
+
+static const struct ldb_module_ops map_ops = {
+	.name          = "map",
+	.search        = map_search,
+	.search_bytree = map_search_bytree,
+	.add_record    = map_add,
+	.modify_record = map_modify,
+	.delete_record = map_delete,
+	.rename_record = map_rename,
+	.named_lock    = map_lock,
+	.named_unlock  = map_unlock,
+	.errstring     = map_errstring
+};
+
+/* the init function */
+struct ldb_module *ldb_map_init(struct ldb_context *ldb, struct ldb_map_mappings *mappings, const char *options[])
+{
+	struct ldb_module *ctx;
+	struct map_private *data;
+
+	ctx = talloc(ldb, struct ldb_module);
+	if (!ctx)
+		return NULL;
+
+	data = talloc(ctx, struct map_private);
+	if (!data) {
+		talloc_free(ctx);
+		return NULL;
+	}
+
+	data->mappings = mappings;
+	ctx->private_data = data;
+	ctx->ldb = ldb;
+	ctx->prev = ctx->next = NULL;
+	ctx->ops = &map_ops;
+
+	return ctx;
+}