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 (int)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 ZERO_STRUCT(tdbdata);
162 status = rec->store(rec, tdbdata, 0);
163 if (!NT_STATUS_IS_OK(status)) {
164 DEBUG(1, ("Storing serverid.tdb record failed: %s\n",
174 bool serverid_deregister(struct server_id id)
176 struct db_context *db;
177 struct serverid_key key;
178 struct db_record *rec;
188 serverid_fill_key(&id, &key);
189 tdbkey = make_tdb_data((uint8_t *)&key, sizeof(key));
191 rec = db->fetch_locked(db, talloc_tos(), tdbkey);
193 DEBUG(1, ("Could not fetch_lock serverid.tdb record\n"));
197 status = rec->delete_rec(rec);
198 if (!NT_STATUS_IS_OK(status)) {
199 DEBUG(1, ("Deleting serverid.tdb record failed: %s\n",
209 struct serverid_exists_state {
210 const struct server_id *id;
214 static int server_exists_parse(TDB_DATA key, TDB_DATA data, void *priv)
216 struct serverid_exists_state *state =
217 (struct serverid_exists_state *)priv;
219 if (data.dsize != sizeof(struct serverid_data)) {
224 * Use memcmp, not direct compare. data.dptr might not be
227 state->exists = (memcmp(&state->id->unique_id, data.dptr,
228 sizeof(state->id->unique_id)) == 0);
232 bool serverid_exists(const struct server_id *id)
234 struct db_context *db;
235 struct serverid_exists_state state;
236 struct serverid_key key;
244 serverid_fill_key(id, &key);
245 tdbkey = make_tdb_data((uint8_t *)&key, sizeof(key));
248 state.exists = false;
250 if (db->parse_record(db, tdbkey, server_exists_parse, &state) == -1) {
256 static bool serverid_rec_parse(const struct db_record *rec,
257 struct server_id *id, uint32_t *msg_flags)
259 struct serverid_key key;
260 struct serverid_data data;
262 if (rec->key.dsize != sizeof(key)) {
263 DEBUG(1, ("Found invalid key length %d in serverid.tdb\n",
264 (int)rec->key.dsize));
267 if (rec->value.dsize != sizeof(data)) {
268 DEBUG(1, ("Found invalid value length %d in serverid.tdb\n",
269 (int)rec->value.dsize));
273 memcpy(&key, rec->key.dptr, sizeof(key));
274 memcpy(&data, rec->value.dptr, sizeof(data));
277 #ifdef CLUSTER_SUPPORT
280 id->unique_id = data.unique_id;
281 *msg_flags = data.msg_flags;
285 struct serverid_traverse_read_state {
286 int (*fn)(const struct server_id *id, uint32_t msg_flags,
291 static int serverid_traverse_read_fn(struct db_record *rec, void *private_data)
293 struct serverid_traverse_read_state *state =
294 (struct serverid_traverse_read_state *)private_data;
298 if (!serverid_rec_parse(rec, &id, &msg_flags)) {
301 return state->fn(&id, msg_flags,state->private_data);
304 bool serverid_traverse_read(int (*fn)(const struct server_id *id,
305 uint32_t msg_flags, void *private_data),
308 struct db_context *db;
309 struct serverid_traverse_read_state state;
316 state.private_data = private_data;
317 return db->traverse_read(db, serverid_traverse_read_fn, &state);
320 struct serverid_traverse_state {
321 int (*fn)(struct db_record *rec, const struct server_id *id,
322 uint32_t msg_flags, void *private_data);
326 static int serverid_traverse_fn(struct db_record *rec, void *private_data)
328 struct serverid_traverse_state *state =
329 (struct serverid_traverse_state *)private_data;
333 if (!serverid_rec_parse(rec, &id, &msg_flags)) {
336 return state->fn(rec, &id, msg_flags, state->private_data);
339 bool serverid_traverse(int (*fn)(struct db_record *rec,
340 const struct server_id *id,
341 uint32_t msg_flags, void *private_data),
344 struct db_context *db;
345 struct serverid_traverse_state state;
352 state.private_data = private_data;
353 return db->traverse(db, serverid_traverse_fn, &state);