2 Unix SMB/CIFS implementation.
4 database wrap functions
6 Copyright (C) Andrew Tridgell 2004
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 the stupidity of the unix fcntl locking design forces us to never
25 allow a database file to be opened twice in the same process. These
26 wrappers provide convenient access to a tdb or ldb, taking advantage
27 of talloc destructors to ensure that only a single open is done
31 #include "lib/util/dlinklist.h"
32 #include "lib/events/events.h"
33 #include "lib/tdb/include/tdb.h"
34 #include "lib/ldb/include/ldb.h"
35 #include "lib/ldb/include/ldb_errors.h"
36 #include "lib/ldb/samba/ldif_handlers.h"
39 static struct tdb_wrap *tdb_list;
42 this is used to catch debug messages from ldb
44 static void ldb_wrap_debug(void *context, enum ldb_debug_level level,
45 const char *fmt, va_list ap) PRINTF_ATTRIBUTE(3,0);
47 static void ldb_wrap_debug(void *context, enum ldb_debug_level level,
48 const char *fmt, va_list ap)
51 if (DEBUGLEVEL < 4 && level > LDB_DEBUG_WARNING) {
54 if (DEBUGLEVEL < 2 && level > LDB_DEBUG_ERROR) {
57 vasprintf(&s, fmt, ap);
59 DEBUG(level, ("ldb: %s\n", s));
63 char *wrap_casefold(void *context, void *mem_ctx, const char *s)
65 return strupper_talloc(mem_ctx, s);
68 /* check for memory leaks on the ldb context */
69 static int ldb_wrap_destructor(struct ldb_context *ldb)
71 size_t *startup_blocks = (size_t *)ldb_get_opaque(ldb, "startup_blocks");
73 talloc_total_blocks(ldb) > *startup_blocks + 100) {
74 DEBUG(0,("WARNING: probable memory leak in ldb %s - %lu blocks (startup %lu) %lu bytes\n",
75 (char *)ldb_get_opaque(ldb, "wrap_url"),
76 (unsigned long)talloc_total_blocks(ldb),
77 (unsigned long)*startup_blocks,
78 (unsigned long)talloc_total_size(ldb)));
80 talloc_report_full(ldb, stdout);
87 wrapped connection to a ldb database
88 to close just talloc_free() the returned ldb_context
90 TODO: We need an error_string parameter
92 struct ldb_context *ldb_wrap_connect(TALLOC_CTX *mem_ctx,
94 struct auth_session_info *session_info,
95 struct cli_credentials *credentials,
97 const char *options[])
99 struct ldb_context *ldb;
101 struct event_context *ev;
102 char *real_url = NULL;
103 size_t *startup_blocks;
105 ldb = ldb_init(mem_ctx);
110 /* we want to use the existing event context if possible. This
111 relies on the fact that in smbd, everything is a child of
112 the main event_context */
113 ev = event_context_find(ldb);
115 if (ldb_set_opaque(ldb, "EventContext", ev)) {
120 if (ldb_set_opaque(ldb, "sessionInfo", session_info)) {
125 if (ldb_set_opaque(ldb, "credentials", credentials)) {
130 ret = ldb_register_samba_handlers(ldb);
136 real_url = private_path(ldb, url);
137 if (real_url == NULL) {
142 /* allow admins to force non-sync ldb for all databases */
143 if (lp_parm_bool(-1, "ldb", "nosync", False)) {
144 flags |= LDB_FLG_NOSYNC;
147 /* we usually want Samba databases to be private. If we later
148 find we need one public, we will need to add a parameter to
149 ldb_wrap_connect() */
150 ldb_set_create_perms(ldb, 0600);
152 ret = ldb_connect(ldb, real_url, flags, options);
153 if (ret != LDB_SUCCESS) {
158 ldb_set_debug(ldb, ldb_wrap_debug, NULL);
160 ldb_set_utf8_fns(ldb, NULL, wrap_casefold);
162 /* setup for leak detection */
163 ldb_set_opaque(ldb, "wrap_url", real_url);
164 startup_blocks = talloc(ldb, size_t);
165 *startup_blocks = talloc_total_blocks(ldb);
166 ldb_set_opaque(ldb, "startup_blocks", startup_blocks);
168 talloc_set_destructor(ldb, ldb_wrap_destructor);
175 Log tdb messages via DEBUG().
177 static void tdb_wrap_log(TDB_CONTEXT *tdb, enum tdb_debug_level level,
178 const char *format, ...) PRINTF_ATTRIBUTE(3,4);
180 static void tdb_wrap_log(TDB_CONTEXT *tdb, enum tdb_debug_level level,
181 const char *format, ...)
187 va_start(ap, format);
188 vasprintf(&ptr, format, ap);
192 case TDB_DEBUG_FATAL:
195 case TDB_DEBUG_ERROR:
198 case TDB_DEBUG_WARNING:
201 case TDB_DEBUG_TRACE:
209 const char *name = tdb_name(tdb);
210 DEBUG(debug_level, ("tdb(%s): %s", name ? name : "unnamed", ptr));
216 /* destroy the last connection to a tdb */
217 static int tdb_wrap_destructor(struct tdb_wrap *w)
220 DLIST_REMOVE(tdb_list, w);
225 wrapped connection to a tdb database
226 to close just talloc_free() the tdb_wrap pointer
228 struct tdb_wrap *tdb_wrap_open(TALLOC_CTX *mem_ctx,
229 const char *name, int hash_size, int tdb_flags,
230 int open_flags, mode_t mode)
233 struct tdb_logging_context log_ctx;
234 log_ctx.log_fn = tdb_wrap_log;
236 for (w=tdb_list;w;w=w->next) {
237 if (strcmp(name, w->name) == 0) {
238 return talloc_reference(mem_ctx, w);
242 w = talloc(mem_ctx, struct tdb_wrap);
247 w->name = talloc_strdup(w, name);
249 w->tdb = tdb_open_ex(name, hash_size, tdb_flags,
250 open_flags, mode, &log_ctx, NULL);
251 if (w->tdb == NULL) {
256 talloc_set_destructor(w, tdb_wrap_destructor);
258 DLIST_ADD(tdb_list, w);