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/>.
25 #ifdef CLUSTER_SUPPORT
30 struct serverid_data
{
35 bool serverid_parent_init(void)
40 * Open the tdb in the parent process (smbd) so that our
41 * CLEAR_IF_FIRST optimization in tdb_reopen_all can properly
45 db
= tdb_wrap_open(talloc_autofree_context(),
46 lock_path("serverid.tdb"),
47 0, TDB_DEFAULT
|TDB_CLEAR_IF_FIRST
, O_RDWR
|O_CREAT
,
50 DEBUG(1, ("could not open serverid.tdb: %s\n",
57 static struct db_context
*serverid_db(void)
59 static struct db_context
*db
;
64 db
= db_open(talloc_autofree_context(), lock_path("serverid.tdb"),
65 0, TDB_DEFAULT
|TDB_CLEAR_IF_FIRST
, O_RDWR
|O_CREAT
, 0644);
69 static void serverid_fill_key(const struct server_id
*id
,
70 struct serverid_key
*key
)
74 #ifdef CLUSTER_SUPPORT
79 bool serverid_register(const struct server_id id
, uint32_t msg_flags
)
81 struct db_context
*db
;
82 struct serverid_key key
;
83 struct serverid_data data
;
84 struct db_record
*rec
;
85 TDB_DATA tdbkey
, tdbdata
;
94 serverid_fill_key(&id
, &key
);
95 tdbkey
= make_tdb_data((uint8_t *)&key
, sizeof(key
));
97 rec
= db
->fetch_locked(db
, talloc_tos(), tdbkey
);
99 DEBUG(1, ("Could not fetch_lock serverid.tdb record\n"));
104 data
.unique_id
= id
.unique_id
;
105 data
.msg_flags
= msg_flags
;
107 tdbdata
= make_tdb_data((uint8_t *)&data
, sizeof(data
));
108 status
= rec
->store(rec
, tdbdata
, 0);
109 if (!NT_STATUS_IS_OK(status
)) {
110 DEBUG(1, ("Storing serverid.tdb record failed: %s\n",
120 bool serverid_register_msg_flags(const struct server_id id
, bool do_reg
,
123 struct db_context
*db
;
124 struct serverid_key key
;
125 struct serverid_data
*data
;
126 struct db_record
*rec
;
127 TDB_DATA tdbkey
, tdbdata
;
136 serverid_fill_key(&id
, &key
);
137 tdbkey
= make_tdb_data((uint8_t *)&key
, sizeof(key
));
139 rec
= db
->fetch_locked(db
, talloc_tos(), tdbkey
);
141 DEBUG(1, ("Could not fetch_lock serverid.tdb record\n"));
145 if (rec
->value
.dsize
!= sizeof(struct serverid_data
)) {
146 DEBUG(1, ("serverid record has unexpected size %d "
147 "(wanted %d)\n", (int)rec
->value
.dsize
,
148 sizeof(struct serverid_data
)));
152 data
= (struct serverid_data
*)rec
->value
.dptr
;
155 data
->msg_flags
|= msg_flags
;
157 data
->msg_flags
&= ~msg_flags
;
160 status
= rec
->store(rec
, tdbdata
, 0);
161 if (!NT_STATUS_IS_OK(status
)) {
162 DEBUG(1, ("Storing serverid.tdb record failed: %s\n",
172 bool serverid_deregister(struct server_id id
)
174 struct db_context
*db
;
175 struct serverid_key key
;
176 struct db_record
*rec
;
186 serverid_fill_key(&id
, &key
);
187 tdbkey
= make_tdb_data((uint8_t *)&key
, sizeof(key
));
189 rec
= db
->fetch_locked(db
, talloc_tos(), tdbkey
);
191 DEBUG(1, ("Could not fetch_lock serverid.tdb record\n"));
195 status
= rec
->delete_rec(rec
);
196 if (!NT_STATUS_IS_OK(status
)) {
197 DEBUG(1, ("Deleting serverid.tdb record failed: %s\n",
207 struct serverid_exists_state
{
208 const struct server_id
*id
;
212 static int server_exists_parse(TDB_DATA key
, TDB_DATA data
, void *priv
)
214 struct serverid_exists_state
*state
=
215 (struct serverid_exists_state
*)priv
;
217 if (data
.dsize
!= sizeof(struct serverid_data
)) {
222 * Use memcmp, not direct compare. data.dptr might not be
225 state
->exists
= (memcmp(&state
->id
->unique_id
, data
.dptr
,
226 sizeof(state
->id
->unique_id
)) == 0);
230 bool serverid_exists(const struct server_id
*id
)
232 struct db_context
*db
;
233 struct serverid_exists_state state
;
234 struct serverid_key key
;
242 serverid_fill_key(id
, &key
);
243 tdbkey
= make_tdb_data((uint8_t *)&key
, sizeof(key
));
246 state
.exists
= false;
248 if (db
->parse_record(db
, tdbkey
, server_exists_parse
, &state
) == -1) {
254 static bool serverid_rec_parse(const struct db_record
*rec
,
255 struct server_id
*id
, uint32_t *msg_flags
)
257 struct serverid_key key
;
258 struct serverid_data data
;
260 if (rec
->key
.dsize
!= sizeof(key
)) {
261 DEBUG(1, ("Found invalid key length %d in serverid.tdb\n",
262 (int)rec
->key
.dsize
));
265 if (rec
->value
.dsize
!= sizeof(data
)) {
266 DEBUG(1, ("Found invalid value length %d in serverid.tdb\n",
267 (int)rec
->value
.dsize
));
271 memcpy(&key
, rec
->key
.dptr
, sizeof(key
));
272 memcpy(&data
, rec
->value
.dptr
, sizeof(data
));
275 #ifdef CLUSTER_SUPPORT
278 id
->unique_id
= data
.unique_id
;
279 *msg_flags
= data
.msg_flags
;
283 struct serverid_traverse_read_state
{
284 int (*fn
)(const struct server_id
*id
, uint32_t msg_flags
,
289 static int serverid_traverse_read_fn(struct db_record
*rec
, void *private_data
)
291 struct serverid_traverse_read_state
*state
=
292 (struct serverid_traverse_read_state
*)private_data
;
296 if (!serverid_rec_parse(rec
, &id
, &msg_flags
)) {
299 return state
->fn(&id
, msg_flags
,state
->private_data
);
302 bool serverid_traverse_read(int (*fn
)(const struct server_id
*id
,
303 uint32_t msg_flags
, void *private_data
),
306 struct db_context
*db
;
307 struct serverid_traverse_read_state state
;
314 state
.private_data
= private_data
;
315 return db
->traverse_read(db
, serverid_traverse_read_fn
, &state
);
318 struct serverid_traverse_state
{
319 int (*fn
)(struct db_record
*rec
, const struct server_id
*id
,
320 uint32_t msg_flags
, void *private_data
);
324 static int serverid_traverse_fn(struct db_record
*rec
, void *private_data
)
326 struct serverid_traverse_state
*state
=
327 (struct serverid_traverse_state
*)private_data
;
331 if (!serverid_rec_parse(rec
, &id
, &msg_flags
)) {
334 return state
->fn(rec
, &id
, msg_flags
, state
->private_data
);
337 bool serverid_traverse(int (*fn
)(struct db_record
*rec
,
338 const struct server_id
*id
,
339 uint32_t msg_flags
, void *private_data
),
342 struct db_context
*db
;
343 struct serverid_traverse_state state
;
350 state
.private_data
= private_data
;
351 return db
->traverse(db
, serverid_traverse_fn
, &state
);