--- /dev/null
+/*
+ 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 "includes.h"
+#include "lib/util/dlinklist.h"
+#include "lib/tdb_wrap/tdb_wrap.h"
+#include "lib/param/param.h"
+
+/* FIXME: TDB2 does this internally, so no need to wrap multiple opens! */
+#if BUILD_TDB2
+static void tdb_wrap_log(struct tdb_context *tdb,
+ enum tdb_log_level level,
+ enum TDB_ERROR ecode,
+ const char *message,
+ void *unused)
+{
+ int dl;
+ const char *name = tdb_name(tdb);
+
+ switch (level) {
+ case TDB_LOG_USE_ERROR:
+ case TDB_LOG_ERROR:
+ dl = 0;
+ break;
+ case TDB_LOG_WARNING:
+ dl = 2;
+ break;
+ default:
+ dl = 0;
+ }
+
+ DEBUG(dl, ("tdb(%s):%s: %s", name ? name : "unnamed",
+ tdb_errorstr(ecode), message));
+}
+#else
+/*
+ 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);
+ }
+}
+#endif
+
+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 loadparm_context *lp_ctx)
+{
+ struct tdb_wrap_private *result;
+
+ result = talloc(mem_ctx, struct tdb_wrap_private);
+ if (result == NULL) {
+ return NULL;
+ }
+ result->name = talloc_strdup(result, name);
+ if (result->name == NULL) {
+ goto fail;
+ }
+
+ if (!lpcfg_use_mmap(lp_ctx)) {
+ tdb_flags |= TDB_NOMMAP;
+ }
+
+ if ((hash_size == 0) && (name != NULL)) {
+ const char *base;
+ base = strrchr_m(name, '/');
+
+ if (base != NULL) {
+ base += 1;
+ } else {
+ base = name;
+ }
+ hash_size = lpcfg_parm_int(lp_ctx, NULL, "tdb_hashsize", base, 0);
+ }
+
+ result->tdb = tdb_open_compat(name, hash_size, tdb_flags,
+ open_flags, mode, tdb_wrap_log, 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 loadparm_context *lp_ctx)
+{
+ struct tdb_wrap *result;
+ struct tdb_wrap_private *w;
+
+ 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) {
+ w = tdb_wrap_private_open(result, name, hash_size, tdb_flags,
+ open_flags, mode, lp_ctx);
+ } 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;
+}
+
git.samba.org / vlendec / samba-autobuild / .git / blobdiff