2 * Map names to server_ids
4 * Copyright Volker Lendecke <vl@samba.org> 2014
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"
22 #include "lib/util/server_id_db.h"
23 #include "lib/tdb_wrap/tdb_wrap.h"
24 #include "lib/util/strv.h"
25 #include "lib/util/util_tdb.h"
26 #include "lib/util/samba_util.h"
28 static TDB_DATA talloc_tdb_data(void *ptr)
30 return (TDB_DATA) { .dptr = ptr, .dsize = talloc_get_size(ptr) };
39 static int server_id_db_destructor(struct server_id_db *db);
41 struct server_id_db *server_id_db_init(TALLOC_CTX *mem_ctx,
43 const char *base_path,
44 int hash_size, int tdb_flags)
46 struct server_id_db *db;
47 size_t pathlen = strlen(base_path) + 11;
50 db = talloc(mem_ctx, struct server_id_db);
57 snprintf(path, pathlen, "%s/names.tdb", base_path);
59 db->tdb = tdb_wrap_open(db, path, hash_size, tdb_flags,
60 O_RDWR|O_CREAT, 0660);
61 if (db->tdb == NULL) {
66 talloc_set_destructor(db, server_id_db_destructor);
71 void server_id_db_reinit(struct server_id_db *db, struct server_id pid)
74 TALLOC_FREE(db->names);
77 struct server_id server_id_db_pid(struct server_id_db *db)
82 static int server_id_db_destructor(struct server_id_db *db)
86 while ((name = strv_next(db->names, name)) != NULL) {
87 server_id_db_remove(db, name);
93 int server_id_db_add(struct server_id_db *db, const char *name)
95 struct tdb_context *tdb = db->tdb->tdb;
100 n = strv_find(db->names, name);
105 ret = strv_add(db, &db->names, name);
110 key = string_term_tdb_data(name);
113 size_t idlen = server_id_str_buf_unique(db->pid, NULL, 0);
116 server_id_str_buf_unique(db->pid, idbuf, idlen);
120 (TDB_DATA) { .dptr = (uint8_t *)idbuf, .dsize = idlen });
124 enum TDB_ERROR err = tdb_error(tdb);
125 strv_delete(&db->names, strv_find(db->names, name));
126 return map_unix_error_from_tdb(err);
132 int server_id_db_prune_name(struct server_id_db *db, const char *name,
133 struct server_id server)
135 struct tdb_context *tdb = db->tdb->tdb;
136 size_t idbuf_len = server_id_str_buf_unique(server, NULL, 0);
137 char idbuf[idbuf_len];
143 key = string_term_tdb_data(name);
144 server_id_str_buf_unique(server, idbuf, idbuf_len);
146 ret = tdb_chainlock(tdb, key);
148 enum TDB_ERROR err = tdb_error(tdb);
149 return map_unix_error_from_tdb(err);
152 ret = tdb_fetch_talloc(tdb, key, db, &data);
154 tdb_chainunlock(tdb, key);
160 id = strv_find(ids, idbuf);
162 tdb_chainunlock(tdb, key);
167 strv_delete(&ids, id);
168 ret = tdb_store(tdb, key, talloc_tdb_data(ids), TDB_MODIFY);
171 tdb_chainunlock(tdb, key);
176 int server_id_db_remove(struct server_id_db *db, const char *name)
181 n = strv_find(db->names, name);
186 ret = server_id_db_prune_name(db, name, db->pid);
191 strv_delete(&db->names, n);
195 int server_id_db_lookup(struct server_id_db *db, const char *name,
196 TALLOC_CTX *mem_ctx, unsigned *pnum_servers,
197 struct server_id **pservers)
199 struct tdb_context *tdb = db->tdb->tdb;
203 unsigned num_servers;
204 struct server_id *servers;
207 key = string_term_tdb_data(name);
209 ret = tdb_fetch_talloc(tdb, key, mem_ctx, &data);
215 num_servers = strv_count(ids);
217 servers = talloc_array(mem_ctx, struct server_id, num_servers);
218 if (servers == NULL) {
225 for (id = ids; id != NULL; id = strv_next(ids, id)) {
226 servers[i++] = server_id_from_string(NONCLUSTER_VNN, id);
231 *pnum_servers = num_servers;
237 bool server_id_db_lookup_one(struct server_id_db *db, const char *name,
238 struct server_id *server)
241 unsigned num_servers;
242 struct server_id *servers;
244 ret = server_id_db_lookup(db, name, db, &num_servers, &servers);
248 if (num_servers == 0) {
249 TALLOC_FREE(servers);
252 *server = servers[0];
253 TALLOC_FREE(servers);
257 struct server_id_db_traverse_state {
259 int (*fn)(const char *name,
260 unsigned num_servers,
261 const struct server_id *servers,
266 static int server_id_db_traverse_fn(struct tdb_context *tdb,
267 TDB_DATA key, TDB_DATA data,
270 struct server_id_db_traverse_state *state = private_data;
273 unsigned num_servers;
274 struct server_id *servers;
277 if (key.dsize == 0) {
280 if (key.dptr[key.dsize-1] != '\0') {
283 name = (const char *)key.dptr;
285 ids = (char *)talloc_memdup(state->mem_ctx, data.dptr, data.dsize);
290 num_servers = strv_count(ids);
291 servers = talloc_array(ids, struct server_id, num_servers);
295 for (id = ids; id != NULL; id = strv_next(ids, id)) {
296 servers[i++] = server_id_from_string(NONCLUSTER_VNN, id);
299 ret = state->fn(name, num_servers, servers, state->private_data);
306 int server_id_db_traverse_read(struct server_id_db *db,
307 int (*fn)(const char *name,
308 unsigned num_servers,
309 const struct server_id *servers,
313 struct server_id_db_traverse_state state;
316 state = (struct server_id_db_traverse_state) {
317 .fn = fn, .private_data = private_data,
318 .mem_ctx = talloc_new(db)
321 if (state.mem_ctx == NULL) {
325 ret = tdb_traverse_read(db->tdb->tdb, server_id_db_traverse_fn,
327 TALLOC_FREE(state.mem_ctx);