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/*
Unix SMB/CIFS implementation.
LDB wrap functions
Copyright (C) Andrew Tridgell 2004
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
the stupidity of the unix fcntl locking design forces us to never
allow a database file to be opened twice in the same process. These
wrappers provide convenient access to a tdb or ldb, taking advantage
of talloc destructors to ensure that only a single open is done
*/
#include "includes.h"
#include "lib/events/events.h"
#include "lib/ldb/include/ldb.h"
#include "lib/ldb/include/ldb_errors.h"
#include "lib/ldb-samba/ldif_handlers.h"
#include "ldb_wrap.h"
#include "dsdb/samdb/samdb.h"
#include "param/param.h"
/*
this is used to catch debug messages from ldb
*/
static void ldb_wrap_debug(void *context, enum ldb_debug_level level,
const char *fmt, va_list ap) PRINTF_ATTRIBUTE(3,0);
static void ldb_wrap_debug(void *context, enum ldb_debug_level level,
const char *fmt, va_list ap)
{
int samba_level = -1;
char *s = NULL;
switch (level) {
case LDB_DEBUG_FATAL:
samba_level = 0;
break;
case LDB_DEBUG_ERROR:
samba_level = 1;
break;
case LDB_DEBUG_WARNING:
samba_level = 2;
break;
case LDB_DEBUG_TRACE:
samba_level = 5;
break;
};
vasprintf(&s, fmt, ap);
if (!s) return;
DEBUG(samba_level, ("ldb: %s\n", s));
free(s);
}
/* check for memory leaks on the ldb context */
static int ldb_wrap_destructor(struct ldb_context *ldb)
{
size_t *startup_blocks = (size_t *)ldb_get_opaque(ldb, "startup_blocks");
if (startup_blocks &&
talloc_total_blocks(ldb) > *startup_blocks + 400) {
DEBUG(0,("WARNING: probable memory leak in ldb %s - %lu blocks (startup %lu) %lu bytes\n",
(char *)ldb_get_opaque(ldb, "wrap_url"),
(unsigned long)talloc_total_blocks(ldb),
(unsigned long)*startup_blocks,
(unsigned long)talloc_total_size(ldb)));
#if 0
talloc_report_full(ldb, stdout);
call_backtrace();
smb_panic("probable memory leak in ldb");
#endif
}
return 0;
}
/*
wrapped connection to a ldb database
to close just talloc_free() the returned ldb_context
TODO: We need an error_string parameter
*/
struct ldb_context *ldb_wrap_connect(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct loadparm_context *lp_ctx,
const char *url,
struct auth_session_info *session_info,
struct cli_credentials *credentials,
unsigned int flags,
const char *options[])
{
struct ldb_context *ldb;
int ret;
char *real_url = NULL;
size_t *startup_blocks;
/* we want to use the existing event context if possible. This
relies on the fact that in smbd, everything is a child of
the main event_context */
if (ev == NULL) {
return NULL;
}
ldb = ldb_init(mem_ctx, ev);
if (ldb == NULL) {
return NULL;
}
ldb_set_modules_dir(ldb,
talloc_asprintf(ldb,
"%s/ldb",
lp_modulesdir(lp_ctx)));
if (ldb_set_opaque(ldb, "sessionInfo", session_info)) {
talloc_free(ldb);
return NULL;
}
if (ldb_set_opaque(ldb, "credentials", credentials)) {
talloc_free(ldb);
return NULL;
}
if (ldb_set_opaque(ldb, "loadparm", lp_ctx)) {
talloc_free(ldb);
return NULL;
}
/* This must be done before we load the schema, as these
* handlers for objectSid and objectGUID etc must take
* precedence over the 'binary attribute' declaration in the
* schema */
ret = ldb_register_samba_handlers(ldb);
if (ret == -1) {
talloc_free(ldb);
return NULL;
}
if (lp_ctx != NULL && strcmp(lp_sam_url(lp_ctx), url) == 0) {
dsdb_set_global_schema(ldb);
}
ldb_set_debug(ldb, ldb_wrap_debug, NULL);
ldb_set_utf8_fns(ldb, NULL, wrap_casefold);
real_url = private_path(ldb, lp_ctx, url);
if (real_url == NULL) {
talloc_free(ldb);
return NULL;
}
/* allow admins to force non-sync ldb for all databases */
if (lp_parm_bool(lp_ctx, NULL, "ldb", "nosync", false)) {
flags |= LDB_FLG_NOSYNC;
}
/* we usually want Samba databases to be private. If we later
find we need one public, we will need to add a parameter to
ldb_wrap_connect() */
ldb_set_create_perms(ldb, 0600);
ret = ldb_connect(ldb, real_url, flags, options);
if (ret != LDB_SUCCESS) {
talloc_free(ldb);
return NULL;
}
/* setup for leak detection */
ldb_set_opaque(ldb, "wrap_url", real_url);
startup_blocks = talloc(ldb, size_t);
*startup_blocks = talloc_total_blocks(ldb);
ldb_set_opaque(ldb, "startup_blocks", startup_blocks);
talloc_set_destructor(ldb, ldb_wrap_destructor);
return ldb;
}
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