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https://github.com/samba-team/samba.git
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07f123b6c8
(This used to be commit 435cbcf78b
)
182 lines
4.2 KiB
C
182 lines
4.2 KiB
C
/*
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Unix SMB/CIFS implementation.
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database wrap functions
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Copyright (C) Andrew Tridgell 2004
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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the stupidity of the unix fcntl locking design forces us to never
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allow a database file to be opened twice in the same process. These
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wrappers provide convenient access to a tdb or ldb, taking advantage
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of talloc destructors to ensure that only a single open is done
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*/
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#include "includes.h"
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#include "dlinklist.h"
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#include "lib/events/events.h"
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#include "lib/tdb/include/tdb.h"
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#include "lib/ldb/include/ldb.h"
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#include "db_wrap.h"
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static struct tdb_wrap *tdb_list;
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/*
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this is used to catch debug messages from ldb
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*/
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static void ldb_wrap_debug(void *context, enum ldb_debug_level level,
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const char *fmt, va_list ap) PRINTF_ATTRIBUTE(3,0);
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static void ldb_wrap_debug(void *context, enum ldb_debug_level level,
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const char *fmt, va_list ap)
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{
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char *s = NULL;
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if (DEBUGLEVEL < 4 && level > LDB_DEBUG_WARNING) {
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return;
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}
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vasprintf(&s, fmt, ap);
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if (!s) return;
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DEBUG(level, ("ldb: %s\n", s));
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free(s);
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}
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/*
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wrapped connection to a ldb database
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to close just talloc_free() the returned ldb_context
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*/
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struct ldb_context *ldb_wrap_connect(TALLOC_CTX *mem_ctx,
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const char *url,
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unsigned int flags,
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const char *options[])
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{
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struct ldb_context *ldb;
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int ret;
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struct event_context *ev;
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char *real_url = NULL;
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ldb = ldb_init(mem_ctx);
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if (ldb == NULL) {
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return NULL;
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}
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/* we want to use the existing event context if possible. This
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relies on the fact that in smbd, everything is a child of
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the main event_context */
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ev = event_context_find(ldb);
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ret = ldb_register_samba_handlers(ldb);
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if (ret == -1) {
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talloc_free(ldb);
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return NULL;
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}
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real_url = private_path(ldb, url);
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if (real_url == NULL) {
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talloc_free(ldb);
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return NULL;
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}
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/* allow admins to force non-sync ldb for all databases */
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if (lp_parm_bool(-1, "ldb", "nosync", False)) {
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flags |= LDB_FLG_NOSYNC;
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}
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ret = ldb_connect(ldb, real_url, flags, options);
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if (ret == -1) {
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talloc_free(ldb);
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return NULL;
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}
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talloc_free(real_url);
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ldb_set_debug(ldb, ldb_wrap_debug, NULL);
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return ldb;
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}
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/*
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Log tdb messages via DEBUG().
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*/
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static void tdb_wrap_log(TDB_CONTEXT *tdb, int level,
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const char *format, ...) PRINTF_ATTRIBUTE(3,4);
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static void tdb_wrap_log(TDB_CONTEXT *tdb, int level,
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const char *format, ...)
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{
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va_list ap;
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char *ptr = NULL;
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va_start(ap, format);
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vasprintf(&ptr, format, ap);
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va_end(ap);
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if (ptr != NULL) {
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const char *name = tdb_name(tdb);
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DEBUG(level, ("tdb(%s): %s", name ? name : "unnamed", ptr));
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free(ptr);
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}
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}
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/* destroy the last connection to a tdb */
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static int tdb_wrap_destructor(void *ctx)
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{
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struct tdb_wrap *w = ctx;
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tdb_close(w->tdb);
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DLIST_REMOVE(tdb_list, w);
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return 0;
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}
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/*
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wrapped connection to a tdb database
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to close just talloc_free() the tdb_wrap pointer
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*/
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struct tdb_wrap *tdb_wrap_open(TALLOC_CTX *mem_ctx,
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const char *name, int hash_size, int tdb_flags,
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int open_flags, mode_t mode)
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{
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struct tdb_wrap *w;
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for (w=tdb_list;w;w=w->next) {
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if (strcmp(name, w->name) == 0) {
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return talloc_reference(mem_ctx, w);
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}
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}
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w = talloc(mem_ctx, struct tdb_wrap);
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if (w == NULL) {
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return NULL;
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}
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w->name = talloc_strdup(w, name);
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w->tdb = tdb_open_ex(name, hash_size, tdb_flags,
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open_flags, mode, tdb_wrap_log, NULL);
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if (w->tdb == NULL) {
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talloc_free(w);
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return NULL;
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}
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talloc_set_destructor(w, tdb_wrap_destructor);
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DLIST_ADD(tdb_list, w);
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return w;
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}
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