2 Unix SMB/CIFS implementation.
3 Implementation of a reliable server_exists()
4 Copyright (C) Volker Lendecke 2010
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #include "system/filesys.h"
24 #include "dbwrap/dbwrap.h"
25 #include "dbwrap/dbwrap_open.h"
26 #include "lib/util/tdb_wrap.h"
27 #include "lib/param/param.h"
28 #include "ctdbd_conn.h"
37 struct serverid_data
{
42 bool serverid_parent_init(TALLOC_CTX
*mem_ctx
)
45 struct loadparm_context
*lp_ctx
;
47 lp_ctx
= loadparm_init_s3(mem_ctx
, loadparm_s3_context());
49 DEBUG(0, ("loadparm_init_s3 failed\n"));
54 * Open the tdb in the parent process (smbd) so that our
55 * CLEAR_IF_FIRST optimization in tdb_reopen_all can properly
59 db
= tdb_wrap_open(mem_ctx
, lock_path("serverid.tdb"),
60 0, TDB_DEFAULT
|TDB_CLEAR_IF_FIRST
|TDB_INCOMPATIBLE_HASH
, O_RDWR
|O_CREAT
,
62 talloc_unlink(mem_ctx
, lp_ctx
);
64 DEBUG(1, ("could not open serverid.tdb: %s\n",
71 static struct db_context
*serverid_db(void)
73 static struct db_context
*db
;
78 db
= db_open(NULL
, lock_path("serverid.tdb"), 0,
79 TDB_DEFAULT
|TDB_CLEAR_IF_FIRST
|TDB_INCOMPATIBLE_HASH
, O_RDWR
|O_CREAT
, 0644);
83 static void serverid_fill_key(const struct server_id
*id
,
84 struct serverid_key
*key
)
88 key
->task_id
= id
->task_id
;
92 bool serverid_register(const struct server_id id
, uint32_t msg_flags
)
94 struct db_context
*db
;
95 struct serverid_key key
;
96 struct serverid_data data
;
97 struct db_record
*rec
;
98 TDB_DATA tdbkey
, tdbdata
;
107 serverid_fill_key(&id
, &key
);
108 tdbkey
= make_tdb_data((uint8_t *)&key
, sizeof(key
));
110 rec
= dbwrap_fetch_locked(db
, talloc_tos(), tdbkey
);
112 DEBUG(1, ("Could not fetch_lock serverid.tdb record\n"));
117 data
.unique_id
= id
.unique_id
;
118 data
.msg_flags
= msg_flags
;
120 tdbdata
= make_tdb_data((uint8_t *)&data
, sizeof(data
));
121 status
= dbwrap_record_store(rec
, tdbdata
, 0);
122 if (!NT_STATUS_IS_OK(status
)) {
123 DEBUG(1, ("Storing serverid.tdb record failed: %s\n",
127 #ifdef HAVE_CTDB_CONTROL_CHECK_SRVIDS_DECL
128 if (lp_clustering()) {
129 register_with_ctdbd(messaging_ctdbd_connection(), id
.unique_id
);
138 bool serverid_register_msg_flags(const struct server_id id
, bool do_reg
,
141 struct db_context
*db
;
142 struct serverid_key key
;
143 struct serverid_data
*data
;
144 struct db_record
*rec
;
155 serverid_fill_key(&id
, &key
);
156 tdbkey
= make_tdb_data((uint8_t *)&key
, sizeof(key
));
158 rec
= dbwrap_fetch_locked(db
, talloc_tos(), tdbkey
);
160 DEBUG(1, ("Could not fetch_lock serverid.tdb record\n"));
164 value
= dbwrap_record_get_value(rec
);
166 if (value
.dsize
!= sizeof(struct serverid_data
)) {
167 DEBUG(1, ("serverid record has unexpected size %d "
168 "(wanted %d)\n", (int)value
.dsize
,
169 (int)sizeof(struct serverid_data
)));
173 data
= (struct serverid_data
*)value
.dptr
;
176 data
->msg_flags
|= msg_flags
;
178 data
->msg_flags
&= ~msg_flags
;
181 status
= dbwrap_record_store(rec
, value
, 0);
182 if (!NT_STATUS_IS_OK(status
)) {
183 DEBUG(1, ("Storing serverid.tdb record failed: %s\n",
193 bool serverid_deregister(struct server_id id
)
195 struct db_context
*db
;
196 struct serverid_key key
;
197 struct db_record
*rec
;
207 serverid_fill_key(&id
, &key
);
208 tdbkey
= make_tdb_data((uint8_t *)&key
, sizeof(key
));
210 rec
= dbwrap_fetch_locked(db
, talloc_tos(), tdbkey
);
212 DEBUG(1, ("Could not fetch_lock serverid.tdb record\n"));
216 status
= dbwrap_record_delete(rec
);
217 if (!NT_STATUS_IS_OK(status
)) {
218 DEBUG(1, ("Deleting serverid.tdb record failed: %s\n",
228 struct serverid_exists_state
{
229 const struct server_id
*id
;
233 static void server_exists_parse(TDB_DATA key
, TDB_DATA data
, void *priv
)
235 struct serverid_exists_state
*state
=
236 (struct serverid_exists_state
*)priv
;
238 if (data
.dsize
!= sizeof(struct serverid_data
)) {
239 state
->exists
= false;
244 * Use memcmp, not direct compare. data.dptr might not be
247 state
->exists
= (memcmp(&state
->id
->unique_id
, data
.dptr
,
248 sizeof(state
->id
->unique_id
)) == 0);
251 bool serverid_exists(const struct server_id
*id
)
253 struct db_context
*db
;
254 struct serverid_exists_state state
;
255 struct serverid_key key
;
259 if (procid_is_me(id
)) {
263 if (!process_exists(*id
)) {
272 serverid_fill_key(id
, &key
);
273 tdbkey
= make_tdb_data((uint8_t *)&key
, sizeof(key
));
276 state
.exists
= false;
278 status
= dbwrap_parse_record(db
, tdbkey
, server_exists_parse
, &state
);
279 if (!NT_STATUS_IS_OK(status
)) {
285 bool serverids_exist(const struct server_id
*ids
, int num_ids
, bool *results
)
287 struct db_context
*db
;
290 #ifdef HAVE_CTDB_CONTROL_CHECK_SRVIDS_DECL
291 if (lp_clustering()) {
292 return ctdb_serverids_exist(messaging_ctdbd_connection(),
293 ids
, num_ids
, results
);
296 if (!processes_exist(ids
, num_ids
, results
)) {
305 for (i
=0; i
<num_ids
; i
++) {
306 struct serverid_exists_state state
;
307 struct serverid_key key
;
314 serverid_fill_key(&ids
[i
], &key
);
315 tdbkey
= make_tdb_data((uint8_t *)&key
, sizeof(key
));
318 state
.exists
= false;
319 dbwrap_parse_record(db
, tdbkey
, server_exists_parse
, &state
);
320 results
[i
] = state
.exists
;
325 static bool serverid_rec_parse(const struct db_record
*rec
,
326 struct server_id
*id
, uint32_t *msg_flags
)
328 struct serverid_key key
;
329 struct serverid_data data
;
333 tdbkey
= dbwrap_record_get_key(rec
);
334 tdbdata
= dbwrap_record_get_value(rec
);
336 if (tdbkey
.dsize
!= sizeof(key
)) {
337 DEBUG(1, ("Found invalid key length %d in serverid.tdb\n",
341 if (tdbdata
.dsize
!= sizeof(data
)) {
342 DEBUG(1, ("Found invalid value length %d in serverid.tdb\n",
343 (int)tdbdata
.dsize
));
347 memcpy(&key
, tdbkey
.dptr
, sizeof(key
));
348 memcpy(&data
, tdbdata
.dptr
, sizeof(data
));
351 id
->task_id
= key
.task_id
;
353 id
->unique_id
= data
.unique_id
;
354 *msg_flags
= data
.msg_flags
;
358 struct serverid_traverse_read_state
{
359 int (*fn
)(const struct server_id
*id
, uint32_t msg_flags
,
364 static int serverid_traverse_read_fn(struct db_record
*rec
, void *private_data
)
366 struct serverid_traverse_read_state
*state
=
367 (struct serverid_traverse_read_state
*)private_data
;
371 if (!serverid_rec_parse(rec
, &id
, &msg_flags
)) {
374 return state
->fn(&id
, msg_flags
,state
->private_data
);
377 bool serverid_traverse_read(int (*fn
)(const struct server_id
*id
,
378 uint32_t msg_flags
, void *private_data
),
381 struct db_context
*db
;
382 struct serverid_traverse_read_state state
;
390 state
.private_data
= private_data
;
392 status
= dbwrap_traverse_read(db
, serverid_traverse_read_fn
, &state
,
394 return NT_STATUS_IS_OK(status
);
397 struct serverid_traverse_state
{
398 int (*fn
)(struct db_record
*rec
, const struct server_id
*id
,
399 uint32_t msg_flags
, void *private_data
);
403 static int serverid_traverse_fn(struct db_record
*rec
, void *private_data
)
405 struct serverid_traverse_state
*state
=
406 (struct serverid_traverse_state
*)private_data
;
410 if (!serverid_rec_parse(rec
, &id
, &msg_flags
)) {
413 return state
->fn(rec
, &id
, msg_flags
, state
->private_data
);
416 bool serverid_traverse(int (*fn
)(struct db_record
*rec
,
417 const struct server_id
*id
,
418 uint32_t msg_flags
, void *private_data
),
421 struct db_context
*db
;
422 struct serverid_traverse_state state
;
430 state
.private_data
= private_data
;
432 status
= dbwrap_traverse(db
, serverid_traverse_fn
, &state
, NULL
);
433 return NT_STATUS_IS_OK(status
);