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 3 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, see <http://www.gnu.org/licenses/>.
23 the stupidity of the unix fcntl locking design forces us to never
24 allow a database file to be opened twice in the same process. These
25 wrappers provide convenient access to a tdb or ldb, taking advantage
26 of talloc destructors to ensure that only a single open is done
30 #include "lib/util/dlinklist.h"
31 #include "lib/events/events.h"
32 #include "lib/tdb/include/tdb.h"
33 #include "lib/ldb/include/ldb.h"
34 #include "lib/ldb/include/ldb_errors.h"
35 #include "lib/ldb/samba/ldif_handlers.h"
37 #include "dsdb/samdb/samdb.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)
59 case LDB_DEBUG_WARNING:
67 vasprintf(&s, fmt, ap);
69 DEBUG(level, ("ldb: %s\n", s));
73 char *wrap_casefold(void *context, void *mem_ctx, const char *s)
75 return strupper_talloc(mem_ctx, s);
78 /* check for memory leaks on the ldb context */
79 static int ldb_wrap_destructor(struct ldb_context *ldb)
81 size_t *startup_blocks = (size_t *)ldb_get_opaque(ldb, "startup_blocks");
83 talloc_total_blocks(ldb) > *startup_blocks + 400) {
84 DEBUG(0,("WARNING: probable memory leak in ldb %s - %lu blocks (startup %lu) %lu bytes\n",
85 (char *)ldb_get_opaque(ldb, "wrap_url"),
86 (unsigned long)talloc_total_blocks(ldb),
87 (unsigned long)*startup_blocks,
88 (unsigned long)talloc_total_size(ldb)));
90 talloc_report_full(ldb, stdout);
92 smb_panic("probable memory leak in ldb");
99 wrapped connection to a ldb database
100 to close just talloc_free() the returned ldb_context
102 TODO: We need an error_string parameter
104 struct ldb_context *ldb_wrap_connect(TALLOC_CTX *mem_ctx,
106 struct auth_session_info *session_info,
107 struct cli_credentials *credentials,
109 const char *options[])
111 struct ldb_context *ldb;
113 struct event_context *ev;
114 char *real_url = NULL;
115 size_t *startup_blocks;
117 ldb = ldb_init(mem_ctx);
122 /* we want to use the existing event context if possible. This
123 relies on the fact that in smbd, everything is a child of
124 the main event_context */
125 ev = event_context_find(ldb);
127 if (ldb_set_opaque(ldb, "EventContext", ev)) {
132 if (ldb_set_opaque(ldb, "sessionInfo", session_info)) {
137 if (ldb_set_opaque(ldb, "credentials", credentials)) {
142 if (strcmp(lp_sam_url(), url) == 0) {
143 dsdb_set_global_schema(ldb);
146 ret = ldb_register_samba_handlers(ldb);
152 ldb_set_debug(ldb, ldb_wrap_debug, NULL);
154 ldb_set_utf8_fns(ldb, NULL, wrap_casefold);
156 real_url = private_path(ldb, url);
157 if (real_url == NULL) {
162 /* allow admins to force non-sync ldb for all databases */
163 if (lp_parm_bool(-1, "ldb", "nosync", False)) {
164 flags |= LDB_FLG_NOSYNC;
167 /* we usually want Samba databases to be private. If we later
168 find we need one public, we will need to add a parameter to
169 ldb_wrap_connect() */
170 ldb_set_create_perms(ldb, 0600);
172 ret = ldb_connect(ldb, real_url, flags, options);
173 if (ret != LDB_SUCCESS) {
178 /* setup for leak detection */
179 ldb_set_opaque(ldb, "wrap_url", real_url);
180 startup_blocks = talloc(ldb, size_t);
181 *startup_blocks = talloc_total_blocks(ldb);
182 ldb_set_opaque(ldb, "startup_blocks", startup_blocks);
184 talloc_set_destructor(ldb, ldb_wrap_destructor);
191 Log tdb messages via DEBUG().
193 static void tdb_wrap_log(TDB_CONTEXT *tdb, enum tdb_debug_level level,
194 const char *format, ...) PRINTF_ATTRIBUTE(3,4);
196 static void tdb_wrap_log(TDB_CONTEXT *tdb, enum tdb_debug_level level,
197 const char *format, ...)
203 va_start(ap, format);
204 vasprintf(&ptr, format, ap);
208 case TDB_DEBUG_FATAL:
211 case TDB_DEBUG_ERROR:
214 case TDB_DEBUG_WARNING:
217 case TDB_DEBUG_TRACE:
225 const char *name = tdb_name(tdb);
226 DEBUG(debug_level, ("tdb(%s): %s", name ? name : "unnamed", ptr));
232 /* destroy the last connection to a tdb */
233 static int tdb_wrap_destructor(struct tdb_wrap *w)
236 DLIST_REMOVE(tdb_list, w);
241 wrapped connection to a tdb database
242 to close just talloc_free() the tdb_wrap pointer
244 struct tdb_wrap *tdb_wrap_open(TALLOC_CTX *mem_ctx,
245 const char *name, int hash_size, int tdb_flags,
246 int open_flags, mode_t mode)
249 struct tdb_logging_context log_ctx;
250 log_ctx.log_fn = tdb_wrap_log;
252 for (w=tdb_list;w;w=w->next) {
253 if (strcmp(name, w->name) == 0) {
254 return talloc_reference(mem_ctx, w);
258 w = talloc(mem_ctx, struct tdb_wrap);
263 w->name = talloc_strdup(w, name);
265 w->tdb = tdb_open_ex(name, hash_size, tdb_flags,
266 open_flags, mode, &log_ctx, NULL);
267 if (w->tdb == NULL) {
272 talloc_set_destructor(w, tdb_wrap_destructor);
274 DLIST_ADD(tdb_list, w);