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/*
Unix SMB/CIFS implementation.
TDB wrap functions
Copyright (C) Andrew Tridgell 2004
Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2007
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/>.
*/
#include "replace.h"
#include "system/filesys.h"
#include "lib/util/dlinklist.h"
#include "lib/util/debug.h"
#include "tdb_wrap.h"
/*
Log tdb messages via DEBUG().
*/
static void tdb_wrap_log(TDB_CONTEXT *tdb, enum tdb_debug_level level,
const char *format, ...) PRINTF_ATTRIBUTE(3,4);
static void tdb_wrap_log(TDB_CONTEXT *tdb, enum tdb_debug_level level,
const char *format, ...)
{
va_list ap;
char *ptr = NULL;
int debuglevel = 0;
int ret;
switch (level) {
case TDB_DEBUG_FATAL:
debuglevel = 0;
break;
case TDB_DEBUG_ERROR:
debuglevel = 1;
break;
case TDB_DEBUG_WARNING:
debuglevel = 2;
break;
case TDB_DEBUG_TRACE:
debuglevel = 5;
break;
default:
debuglevel = 0;
}
va_start(ap, format);
ret = vasprintf(&ptr, format, ap);
va_end(ap);
if (ret != -1) {
const char *name = tdb_name(tdb);
DEBUG(debuglevel, ("tdb(%s): %s", name ? name : "unnamed", ptr));
free(ptr);
}
}
struct tdb_wrap_private {
struct tdb_context *tdb;
const char *name;
struct tdb_wrap_private *next, *prev;
};
static struct tdb_wrap_private *tdb_list;
/* destroy the last connection to a tdb */
static int tdb_wrap_private_destructor(struct tdb_wrap_private *w)
{
tdb_close(w->tdb);
DLIST_REMOVE(tdb_list, w);
return 0;
}
static struct tdb_wrap_private *tdb_wrap_private_open(TALLOC_CTX *mem_ctx,
const char *name,
int hash_size,
int tdb_flags,
int open_flags,
mode_t mode)
{
struct tdb_wrap_private *result;
struct tdb_logging_context lctx = { .log_fn = tdb_wrap_log };
result = talloc_pooled_object(mem_ctx, struct tdb_wrap_private,
1, strlen(name)+1);
if (result == NULL) {
return NULL;
}
/* Doesn't fail, see talloc_pooled_object */
result->name = talloc_strdup(result, name);
/*
* TDB files don't make sense after execve()
*/
open_flags |= O_CLOEXEC;
result->tdb = tdb_open_ex(name, hash_size, tdb_flags,
open_flags, mode, &lctx, NULL);
if (result->tdb == NULL) {
goto fail;
}
talloc_set_destructor(result, tdb_wrap_private_destructor);
DLIST_ADD(tdb_list, result);
return result;
fail:
TALLOC_FREE(result);
return NULL;
}
/*
wrapped connection to a tdb database
to close just talloc_free() the tdb_wrap pointer
*/
struct tdb_wrap *tdb_wrap_open(TALLOC_CTX *mem_ctx,
const char *name, int hash_size, int tdb_flags,
int open_flags, mode_t mode)
{
struct tdb_wrap *result;
struct tdb_wrap_private *w;
if (name == NULL) {
errno = EINVAL;
return NULL;
}
result = talloc(mem_ctx, struct tdb_wrap);
if (result == NULL) {
return NULL;
}
for (w=tdb_list;w;w=w->next) {
if (strcmp(name, w->name) == 0) {
break;
}
}
if (w == NULL) {
if (tdb_flags & TDB_MUTEX_LOCKING) {
if (!tdb_runtime_check_for_robust_mutexes()) {
tdb_flags &= ~TDB_MUTEX_LOCKING;
}
}
w = tdb_wrap_private_open(result, name, hash_size, tdb_flags,
open_flags, mode);
} else {
/*
* Correctly use talloc_reference: The tdb will be
* closed when "w" is being freed. The caller never
* sees "w", so an incorrect use of talloc_free(w)
* instead of calling talloc_unlink is not possible.
* To avoid having to refcount ourselves, "w" will
* have multiple parents that hang off all the
* tdb_wrap's being returned from here. Those parents
* can be freed without problem.
*/
if (talloc_reference(result, w) == NULL) {
goto fail;
}
}
if (w == NULL) {
goto fail;
}
result->tdb = w->tdb;
return result;
fail:
TALLOC_FREE(result);
return NULL;
}
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