2 Unix SMB/CIFS implementation.
6 Copyright (C) Andrew Tridgell 2004-2009
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/events/events.h"
31 #include "lib/ldb/include/ldb.h"
32 #include "lib/ldb/include/ldb_errors.h"
33 #include "lib/ldb-samba/ldif_handlers.h"
35 #include "dsdb/samdb/samdb.h"
36 #include "param/param.h"
37 #include "../lib/util/dlinklist.h"
38 #include "../tdb/include/tdb.h"
41 this is used to catch debug messages from ldb
43 static void ldb_wrap_debug(void *context, enum ldb_debug_level level,
44 const char *fmt, va_list ap) PRINTF_ATTRIBUTE(3,0);
46 static void ldb_wrap_debug(void *context, enum ldb_debug_level level,
47 const char *fmt, va_list ap)
58 case LDB_DEBUG_WARNING:
66 vasprintf(&s, fmt, ap);
68 DEBUG(samba_level, ("ldb: %s\n", s));
74 connecting to a ldb can be a relatively expensive operation because
75 of the schema and partition loads. We keep a list of open ldb
76 contexts here, and try to re-use when possible.
78 This means callers of ldb_wrap_connect() must use talloc_unlink() or
79 the free of a parent to destroy the context
81 static struct ldb_wrap {
82 struct ldb_wrap *next, *prev;
83 struct ldb_wrap_context {
84 /* the context is what we use to tell if two ldb
85 * connections are exactly equivalent
88 struct tevent_context *ev;
89 struct loadparm_context *lp_ctx;
90 struct auth_session_info *session_info;
91 struct cli_credentials *credentials;
94 struct ldb_context *ldb;
98 free a ldb_wrap structure
100 static int ldb_wrap_destructor(struct ldb_wrap *w)
102 DLIST_REMOVE(ldb_wrap_list, w);
106 struct ldb_context *samba_ldb_init(TALLOC_CTX *mem_ctx,
107 struct tevent_context *ev,
108 struct loadparm_context *lp_ctx,
109 struct auth_session_info *session_info,
110 struct cli_credentials *credentials
113 struct ldb_context *ldb;
116 /* we want to use the existing event context if possible. This
117 relies on the fact that in smbd, everything is a child of
118 the main event_context */
123 ldb = ldb_init(mem_ctx, ev);
128 ldb_set_modules_dir(ldb,
131 lpcfg_modulesdir(lp_ctx)));
133 ldb_set_debug(ldb, ldb_wrap_debug, NULL);
135 ldb_set_utf8_fns(ldb, NULL, wrap_casefold);
138 if (ldb_set_opaque(ldb, "sessionInfo", session_info)) {
145 if (ldb_set_opaque(ldb, "credentials", credentials)) {
151 if (ldb_set_opaque(ldb, "loadparm", lp_ctx)) {
156 /* This must be done before we load the schema, as these
157 * handlers for objectSid and objectGUID etc must take
158 * precedence over the 'binary attribute' declaration in the
160 ret = ldb_register_samba_handlers(ldb);
161 if (ret != LDB_SUCCESS) {
166 /* we usually want Samba databases to be private. If we later
167 find we need one public, we will need to add a parameter to
168 ldb_wrap_connect() */
169 ldb_set_create_perms(ldb, 0600);
174 struct ldb_context *ldb_wrap_find(const char *url,
175 struct tevent_context *ev,
176 struct loadparm_context *lp_ctx,
177 struct auth_session_info *session_info,
178 struct cli_credentials *credentials,
182 /* see if we can re-use an existing ldb */
183 for (w=ldb_wrap_list; w; w=w->next) {
184 if (w->context.ev == ev &&
185 w->context.lp_ctx == lp_ctx &&
186 w->context.session_info == session_info &&
187 w->context.credentials == credentials &&
188 w->context.flags == flags &&
189 (w->context.url == url || strcmp(w->context.url, url) == 0))
196 int samba_ldb_connect(struct ldb_context *ldb, struct loadparm_context *lp_ctx, const char *url, int flags)
199 char *real_url = NULL;
201 /* allow admins to force non-sync ldb for all databases */
202 if (lpcfg_parm_bool(lp_ctx, NULL, "ldb", "nosync", false)) {
203 flags |= LDB_FLG_NOSYNC;
207 flags |= LDB_FLG_ENABLE_TRACING;
210 real_url = private_path(ldb, lp_ctx, url);
211 if (real_url == NULL) {
212 return LDB_ERR_OPERATIONS_ERROR;
215 ret = ldb_connect(ldb, real_url, flags, NULL);
217 if (ret != LDB_SUCCESS) {
221 /* setup for leak detection */
222 ldb_set_opaque(ldb, "wrap_url", real_url);
227 bool ldb_wrap_add(const char *url, struct tevent_context *ev,
228 struct loadparm_context *lp_ctx,
229 struct auth_session_info *session_info,
230 struct cli_credentials *credentials,
232 struct ldb_context *ldb)
235 struct ldb_wrap_context c;
237 /* add to the list of open ldb contexts */
238 w = talloc(ldb, struct ldb_wrap);
246 c.session_info = session_info;
247 c.credentials = credentials;
251 w->context.url = talloc_strdup(w, url);
252 if (w->context.url == NULL) {
257 /* take a reference to the session_info, as it is
258 * possible for the ldb to live longer than the
259 * session_info. This happens when a DRS DsBind call
260 * reuses a handle, but the original connection is
261 * shutdown. The token for the new connection is still
262 * valid, so we need the session_info to remain valid for
265 if (talloc_reference(w, session_info) == NULL) {
272 DLIST_ADD(ldb_wrap_list, w);
274 talloc_set_destructor(w, ldb_wrap_destructor);
281 wrapped connection to a ldb database
282 to close just talloc_free() the returned ldb_context
284 TODO: We need an error_string parameter
286 struct ldb_context *ldb_wrap_connect(TALLOC_CTX *mem_ctx,
287 struct tevent_context *ev,
288 struct loadparm_context *lp_ctx,
290 struct auth_session_info *session_info,
291 struct cli_credentials *credentials,
294 struct ldb_context *ldb;
297 ldb = ldb_wrap_find(url, ev, lp_ctx, session_info, credentials, flags);
299 return talloc_reference(mem_ctx, ldb);
301 ldb = samba_ldb_init(mem_ctx, ev, lp_ctx, session_info, credentials);
306 ret = samba_ldb_connect(ldb, lp_ctx, url, flags);
307 if (ret != LDB_SUCCESS) {
312 if (!ldb_wrap_add(url, ev, lp_ctx, session_info, credentials, flags, ldb)) {
317 DEBUG(3,("ldb_wrap open of %s\n", url));
323 when we fork() we need to make sure that any open ldb contexts have
324 any open transactions cancelled
326 void ldb_wrap_fork_hook(void)
330 for (w=ldb_wrap_list; w; w=w->next) {
331 if (ldb_transaction_cancel_noerr(w->ldb) != LDB_SUCCESS) {
332 smb_panic("Failed to cancel child transactions\n");
336 if (tdb_reopen_all(1) == -1) {
337 smb_panic("tdb_reopen_all failed\n");
341 char *ldb_relative_path(struct ldb_context *ldb,
345 const char *base_url =
346 (const char *)ldb_get_opaque(ldb, "ldb_url");
347 char *path, *p, *full_name;
351 if (strncmp("tdb://", base_url, 6) == 0) {
352 base_url = base_url+6;
354 path = talloc_strdup(mem_ctx, base_url);
358 if ( (p = strrchr(path, '/')) != NULL) {
360 full_name = talloc_asprintf(mem_ctx, "%s/%s", path, name);
362 full_name = talloc_asprintf(mem_ctx, "./%s", name);