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/*
Unix SMB/CIFS implementation.
database 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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
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 "dlinklist.h"
#include "lib/tdb/include/tdb.h"
#include "lib/ldb/include/ldb.h"
#include "db_wrap.h"
struct ldb_wrap {
struct ldb_context *ldb;
const char *url;
struct ldb_wrap *next, *prev;
};
static struct ldb_wrap *ldb_list;
static struct tdb_wrap *tdb_list;
/*
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)
{
char *s = NULL;
if (DEBUGLEVEL < 4 && level > LDB_DEBUG_WARNING) {
return;
}
vasprintf(&s, fmt, ap);
if (!s) return;
DEBUG(level, ("ldb: %s\n", s));
free(s);
}
/* destroy the last connection to a ldb */
static int ldb_wrap_destructor(void *ctx)
{
struct ldb_wrap *w = ctx;
DLIST_REMOVE(ldb_list, w);
return 0;
}
/*
wrapped connection to a ldb database
to close just talloc_free() the returned ldb_context
*/
struct ldb_context *ldb_wrap_connect(TALLOC_CTX *mem_ctx,
const char *url,
unsigned int flags,
const char *options[])
{
struct ldb_context *ldb;
struct ldb_wrap *w;
int ret;
struct event_context *ev;
for (w = ldb_list; w; w = w->next) {
if (strcmp(url, w->url) == 0) {
return talloc_reference(mem_ctx, w->ldb);
}
}
ldb = ldb_init(talloc_autofree_context());
if (ldb == NULL) {
return NULL;
}
/* 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 */
ev = talloc_find_parent_bytype(mem_ctx, struct event_context);
if (ev) {
ldb_set_opaque(ldb, "EventContext", ev);
} else {
DEBUG(0,("WARNING: event_context not found\n"));
talloc_show_parents(mem_ctx, stdout);
}
ret = ldb_register_samba_handlers(ldb);
if (ret == -1) {
talloc_free(ldb);
return NULL;
}
ret = ldb_connect(ldb, url, flags, options);
if (ret == -1) {
talloc_free(ldb);
return NULL;
}
w = talloc(ldb, struct ldb_wrap);
if (w == NULL) {
talloc_free(ldb);
return NULL;
}
w->ldb = ldb;
w->url = talloc_strdup(w, url);
talloc_set_destructor(w, ldb_wrap_destructor);
ldb_set_debug(ldb, ldb_wrap_debug, NULL);
DLIST_ADD(ldb_list, w);
return ldb;
}
/*
Log tdb messages via DEBUG().
*/
static void tdb_wrap_log(TDB_CONTEXT *tdb, int level,
const char *format, ...) PRINTF_ATTRIBUTE(3,4);
static void tdb_wrap_log(TDB_CONTEXT *tdb, int level,
const char *format, ...)
{
va_list ap;
char *ptr = NULL;
va_start(ap, format);
vasprintf(&ptr, format, ap);
va_end(ap);
if (ptr != NULL) {
DEBUG(level, ("tdb(%s): %s", tdb->name ? tdb->name : "unnamed", ptr));
free(ptr);
}
}
/* destroy the last connection to a tdb */
static int tdb_wrap_destructor(void *ctx)
{
struct tdb_wrap *w = ctx;
tdb_close(w->tdb);
DLIST_REMOVE(tdb_list, w);
return 0;
}
/*
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 *w;
for (w=tdb_list;w;w=w->next) {
if (strcmp(name, w->name) == 0) {
return talloc_reference(mem_ctx, w);
}
}
w = talloc(mem_ctx, struct tdb_wrap);
if (w == NULL) {
return NULL;
}
w->name = talloc_strdup(w, name);
w->tdb = tdb_open_ex(name, hash_size, tdb_flags,
open_flags, mode, tdb_wrap_log, NULL);
if (w->tdb == NULL) {
talloc_free(w);
return NULL;
}
talloc_set_destructor(w, tdb_wrap_destructor);
DLIST_ADD(tdb_list, w);
return w;
}
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