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"
32 #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 "lib/util/util_paths.h"
42 #define DBGC_CLASS DBGC_LDB
45 this is used to catch debug messages from ldb
47 static void ldb_wrap_debug(void *context, enum ldb_debug_level level,
48 const char *fmt, va_list ap) PRINTF_ATTRIBUTE(3,0);
50 static void ldb_wrap_debug(void *context, enum ldb_debug_level level,
51 const char *fmt, va_list ap)
61 case LDB_DEBUG_WARNING:
69 if (CHECK_DEBUGLVL(samba_level)) {
73 ret = vasprintf(&s, fmt, ap);
77 DEBUG(samba_level, ("ldb: %s\n", s));
84 connecting to a ldb can be a relatively expensive operation because
85 of the schema and partition loads. We keep a list of open ldb
86 contexts here, and try to re-use when possible.
88 This means callers of ldb_wrap_connect() must use talloc_unlink() or
89 the free of a parent to destroy the context
91 static struct ldb_wrap {
92 struct ldb_wrap *next, *prev;
93 struct ldb_wrap_context {
94 /* the context is what we use to tell if two ldb
95 * connections are exactly equivalent
98 struct tevent_context *ev;
99 struct loadparm_context *lp_ctx;
100 struct auth_session_info *session_info;
101 struct cli_credentials *credentials;
104 struct ldb_context *ldb;
108 free a ldb_wrap structure
110 static int ldb_wrap_destructor(struct ldb_wrap *w)
112 DLIST_REMOVE(ldb_wrap_list, w);
117 * The casefolder for s4's LDB databases - Unicode-safe
119 char *wrap_casefold(void *context, void *mem_ctx, const char *s, size_t n)
121 return strupper_talloc_n(mem_ctx, s, n);
125 struct ldb_context *samba_ldb_init(TALLOC_CTX *mem_ctx,
126 struct tevent_context *ev,
127 struct loadparm_context *lp_ctx,
128 struct auth_session_info *session_info,
129 struct cli_credentials *credentials)
131 struct ldb_context *ldb;
134 ldb = ldb_init(mem_ctx, ev);
139 ldb_set_modules_dir(ldb, modules_path(ldb, "ldb"));
141 ldb_set_debug(ldb, ldb_wrap_debug, NULL);
143 ldb_set_utf8_fns(ldb, NULL, wrap_casefold);
146 if (ldb_set_opaque(ldb, "sessionInfo", session_info)) {
153 if (ldb_set_opaque(ldb, "credentials", credentials)) {
159 if (ldb_set_opaque(ldb, "loadparm", lp_ctx)) {
164 /* This must be done before we load the schema, as these
165 * handlers for objectSid and objectGUID etc must take
166 * precedence over the 'binary attribute' declaration in the
168 ret = ldb_register_samba_handlers(ldb);
169 if (ret != LDB_SUCCESS) {
174 /* we usually want Samba databases to be private. If we later
175 find we need one public, we will need to add a parameter to
176 ldb_wrap_connect() */
177 ldb_set_create_perms(ldb, 0600);
182 struct ldb_context *ldb_wrap_find(const char *url,
183 struct tevent_context *ev,
184 struct loadparm_context *lp_ctx,
185 struct auth_session_info *session_info,
186 struct cli_credentials *credentials,
190 /* see if we can re-use an existing ldb */
191 for (w=ldb_wrap_list; w; w=w->next) {
192 if (w->context.ev == ev &&
193 w->context.lp_ctx == lp_ctx &&
194 w->context.session_info == session_info &&
195 w->context.credentials == credentials &&
196 w->context.flags == flags &&
197 (w->context.url == url || strcmp(w->context.url, url) == 0))
204 int samba_ldb_connect(struct ldb_context *ldb, struct loadparm_context *lp_ctx,
205 const char *url, unsigned int flags)
208 char *real_url = NULL;
210 /* allow admins to force non-sync ldb for all databases */
211 if (lpcfg_parm_bool(lp_ctx, NULL, "ldb", "nosync", false)) {
212 flags |= LDB_FLG_NOSYNC;
216 flags |= LDB_FLG_ENABLE_TRACING;
219 real_url = lpcfg_private_path(ldb, lp_ctx, url);
220 if (real_url == NULL) {
221 return LDB_ERR_OPERATIONS_ERROR;
224 ret = ldb_connect(ldb, real_url, flags, NULL);
226 if (ret != LDB_SUCCESS) {
230 /* setup for leak detection */
231 ldb_set_opaque(ldb, "wrap_url", real_url);
236 bool ldb_wrap_add(const char *url, struct tevent_context *ev,
237 struct loadparm_context *lp_ctx,
238 struct auth_session_info *session_info,
239 struct cli_credentials *credentials,
241 struct ldb_context *ldb)
244 struct ldb_wrap_context c;
246 /* add to the list of open ldb contexts */
247 w = talloc(ldb, struct ldb_wrap);
255 c.session_info = session_info;
256 c.credentials = credentials;
260 w->context.url = talloc_strdup(w, url);
261 if (w->context.url == NULL) {
266 /* take a reference to the session_info, as it is
267 * possible for the ldb to live longer than the
268 * session_info. This happens when a DRS DsBind call
269 * reuses a handle, but the original connection is
270 * shutdown. The token for the new connection is still
271 * valid, so we need the session_info to remain valid for
274 if (talloc_reference(w, session_info) == NULL) {
281 DLIST_ADD(ldb_wrap_list, w);
283 talloc_set_destructor(w, ldb_wrap_destructor);
290 wrapped connection to a ldb database
291 to close just talloc_free() the returned ldb_context
293 TODO: We need an error_string parameter
295 struct ldb_context *ldb_wrap_connect(TALLOC_CTX *mem_ctx,
296 struct tevent_context *ev,
297 struct loadparm_context *lp_ctx,
299 struct auth_session_info *session_info,
300 struct cli_credentials *credentials,
303 struct ldb_context *ldb;
306 ldb = ldb_wrap_find(url, ev, lp_ctx, session_info, credentials, flags);
308 return talloc_reference(mem_ctx, ldb);
310 ldb = samba_ldb_init(mem_ctx, ev, lp_ctx, session_info, credentials);
315 ret = samba_ldb_connect(ldb, lp_ctx, url, flags);
316 if (ret != LDB_SUCCESS) {
321 if (!ldb_wrap_add(url, ev, lp_ctx, session_info, credentials, flags, ldb)) {
326 DEBUG(3,("ldb_wrap open of %s\n", url));
332 call tdb_reopen_all() in case there is a TDB open so we are
333 not blocked from re-opening it inside ldb_tdb.
335 void ldb_wrap_fork_hook(void)
337 if (tdb_reopen_all(1) != 0) {
338 smb_panic("tdb_reopen_all failed\n");
342 char *ldb_relative_path(struct ldb_context *ldb,
346 const char *base_url =
347 (const char *)ldb_get_opaque(ldb, "ldb_url");
348 char *path, *p, *full_name;
352 if (strncmp("tdb://", base_url, 6) == 0) {
353 base_url = base_url+6;
355 path = talloc_strdup(mem_ctx, base_url);
359 if ( (p = strrchr(path, '/')) != NULL) {
361 full_name = talloc_asprintf(mem_ctx, "%s/%s", path, name);
363 full_name = talloc_asprintf(mem_ctx, "./%s", name);