2 Unix SMB/CIFS implementation.
3 Database interface wrapper around tdb
4 Copyright (C) Volker Lendecke 2005-2007
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 "dbwrap/dbwrap.h"
22 #include "dbwrap/dbwrap_private.h"
23 #include "dbwrap/dbwrap_tdb.h"
24 #include "lib/tdb_wrap/tdb_wrap.h"
25 #include "lib/util/util_tdb.h"
26 #include "system/filesys.h"
27 #include "ccan/str/str.h"
30 struct tdb_wrap *wtdb;
38 static NTSTATUS db_tdb_store(struct db_record *rec, TDB_DATA data, int flag);
39 static NTSTATUS db_tdb_delete(struct db_record *rec);
41 static void db_tdb_log_key(const char *prefix, TDB_DATA key)
46 if (DEBUGLEVEL < 10) {
50 if (DEBUGLEVEL == 10) {
52 * Only fully spam at debuglevel > 10
54 len = MIN(10, key.dsize);
56 keystr = hex_encode_talloc(talloc_tos(), (unsigned char *)(key.dptr),
58 DEBUG(10, ("%s key %s\n", prefix, keystr));
62 static int db_tdb_record_destr(struct db_record* data)
64 struct db_tdb_ctx *ctx =
65 talloc_get_type_abort(data->private_data, struct db_tdb_ctx);
67 db_tdb_log_key("Unlocking", data->key);
68 tdb_chainunlock(ctx->wtdb->tdb, data->key);
72 struct tdb_fetch_locked_state {
74 struct db_record *result;
77 static int db_tdb_fetchlock_parse(TDB_DATA key, TDB_DATA data,
80 struct tdb_fetch_locked_state *state =
81 (struct tdb_fetch_locked_state *)private_data;
82 struct db_record *result;
84 result = (struct db_record *)talloc_size(
86 sizeof(struct db_record) + key.dsize + data.dsize);
91 state->result = result;
93 result->key.dsize = key.dsize;
94 result->key.dptr = ((uint8_t *)result) + sizeof(struct db_record);
95 memcpy(result->key.dptr, key.dptr, key.dsize);
97 result->value.dsize = data.dsize;
100 result->value.dptr = result->key.dptr+key.dsize;
101 memcpy(result->value.dptr, data.dptr, data.dsize);
104 result->value.dptr = NULL;
110 static struct db_record *db_tdb_fetch_locked_internal(
111 struct db_context *db, TALLOC_CTX *mem_ctx, TDB_DATA key)
113 struct db_tdb_ctx *ctx = talloc_get_type_abort(db->private_data,
115 struct tdb_fetch_locked_state state;
117 state.mem_ctx = mem_ctx;
120 if ((tdb_parse_record(ctx->wtdb->tdb, key, db_tdb_fetchlock_parse,
122 (tdb_error(ctx->wtdb->tdb) != TDB_ERR_NOEXIST)) {
123 tdb_chainunlock(ctx->wtdb->tdb, key);
127 if (state.result == NULL) {
128 db_tdb_fetchlock_parse(key, tdb_null, &state);
131 if (state.result == NULL) {
132 tdb_chainunlock(ctx->wtdb->tdb, key);
136 talloc_set_destructor(state.result, db_tdb_record_destr);
138 state.result->private_data = talloc_reference(state.result, ctx);
139 state.result->store = db_tdb_store;
140 state.result->delete_rec = db_tdb_delete;
142 DEBUG(10, ("Allocated locked data 0x%p\n", state.result));
147 static struct db_record *db_tdb_fetch_locked(
148 struct db_context *db, TALLOC_CTX *mem_ctx, TDB_DATA key)
150 struct db_tdb_ctx *ctx = talloc_get_type_abort(db->private_data,
153 db_tdb_log_key("Locking", key);
154 if (tdb_chainlock(ctx->wtdb->tdb, key) != 0) {
155 DEBUG(3, ("tdb_chainlock failed\n"));
158 return db_tdb_fetch_locked_internal(db, mem_ctx, key);
161 static struct db_record *db_tdb_try_fetch_locked(
162 struct db_context *db, TALLOC_CTX *mem_ctx, TDB_DATA key)
164 struct db_tdb_ctx *ctx = talloc_get_type_abort(db->private_data,
167 db_tdb_log_key("Trying to lock", key);
168 if (tdb_chainlock_nonblock(ctx->wtdb->tdb, key) != 0) {
169 DEBUG(3, ("tdb_chainlock_nonblock failed\n"));
172 return db_tdb_fetch_locked_internal(db, mem_ctx, key);
176 static int db_tdb_exists(struct db_context *db, TDB_DATA key)
178 struct db_tdb_ctx *ctx = talloc_get_type_abort(
179 db->private_data, struct db_tdb_ctx);
180 return tdb_exists(ctx->wtdb->tdb, key);
183 static int db_tdb_wipe(struct db_context *db)
185 struct db_tdb_ctx *ctx = talloc_get_type_abort(
186 db->private_data, struct db_tdb_ctx);
187 return tdb_wipe_all(ctx->wtdb->tdb);
190 static int db_tdb_check(struct db_context *db)
192 struct db_tdb_ctx *ctx = talloc_get_type_abort(
193 db->private_data, struct db_tdb_ctx);
194 return tdb_check(ctx->wtdb->tdb, NULL, NULL);
197 struct db_tdb_parse_state {
198 void (*parser)(TDB_DATA key, TDB_DATA data,
204 * tdb_parse_record expects a parser returning int, mixing up tdb and
205 * parser errors. Wrap around that by always returning 0 and have
206 * dbwrap_parse_record expect a parser returning void.
209 static int db_tdb_parser(TDB_DATA key, TDB_DATA data, void *private_data)
211 struct db_tdb_parse_state *state =
212 (struct db_tdb_parse_state *)private_data;
213 state->parser(key, data, state->private_data);
217 static NTSTATUS db_tdb_parse(struct db_context *db, TDB_DATA key,
218 void (*parser)(TDB_DATA key, TDB_DATA data,
222 struct db_tdb_ctx *ctx = talloc_get_type_abort(
223 db->private_data, struct db_tdb_ctx);
224 struct db_tdb_parse_state state;
227 state.parser = parser;
228 state.private_data = private_data;
230 ret = tdb_parse_record(ctx->wtdb->tdb, key, db_tdb_parser, &state);
233 return map_nt_error_from_tdb(tdb_error(ctx->wtdb->tdb));
238 static NTSTATUS db_tdb_store(struct db_record *rec, TDB_DATA data, int flag)
240 struct db_tdb_ctx *ctx = talloc_get_type_abort(rec->private_data,
244 * This has a bug: We need to replace rec->value for correct
245 * operation, but right now brlock and locking don't use the value
246 * anymore after it was stored.
249 return (tdb_store(ctx->wtdb->tdb, rec->key, data, flag) == 0) ?
250 NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL;
253 static NTSTATUS db_tdb_delete(struct db_record *rec)
255 struct db_tdb_ctx *ctx = talloc_get_type_abort(rec->private_data,
258 if (tdb_delete(ctx->wtdb->tdb, rec->key) == 0) {
262 if (tdb_error(ctx->wtdb->tdb) == TDB_ERR_NOEXIST) {
263 return NT_STATUS_NOT_FOUND;
266 return NT_STATUS_UNSUCCESSFUL;
269 struct db_tdb_traverse_ctx {
270 struct db_context *db;
271 int (*f)(struct db_record *rec, void *private_data);
275 static int db_tdb_traverse_func(TDB_CONTEXT *tdb, TDB_DATA kbuf, TDB_DATA dbuf,
278 struct db_tdb_traverse_ctx *ctx =
279 (struct db_tdb_traverse_ctx *)private_data;
280 struct db_record rec;
284 rec.store = db_tdb_store;
285 rec.delete_rec = db_tdb_delete;
286 rec.private_data = ctx->db->private_data;
289 return ctx->f(&rec, ctx->private_data);
292 static int db_tdb_traverse(struct db_context *db,
293 int (*f)(struct db_record *rec, void *private_data),
296 struct db_tdb_ctx *db_ctx =
297 talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
298 struct db_tdb_traverse_ctx ctx;
302 ctx.private_data = private_data;
303 return tdb_traverse(db_ctx->wtdb->tdb, db_tdb_traverse_func, &ctx);
306 static NTSTATUS db_tdb_store_deny(struct db_record *rec, TDB_DATA data, int flag)
308 return NT_STATUS_MEDIA_WRITE_PROTECTED;
311 static NTSTATUS db_tdb_delete_deny(struct db_record *rec)
313 return NT_STATUS_MEDIA_WRITE_PROTECTED;
316 static int db_tdb_traverse_read_func(TDB_CONTEXT *tdb, TDB_DATA kbuf, TDB_DATA dbuf,
319 struct db_tdb_traverse_ctx *ctx =
320 (struct db_tdb_traverse_ctx *)private_data;
321 struct db_record rec;
325 rec.store = db_tdb_store_deny;
326 rec.delete_rec = db_tdb_delete_deny;
327 rec.private_data = ctx->db->private_data;
330 return ctx->f(&rec, ctx->private_data);
333 static int db_tdb_traverse_read(struct db_context *db,
334 int (*f)(struct db_record *rec, void *private_data),
337 struct db_tdb_ctx *db_ctx =
338 talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
339 struct db_tdb_traverse_ctx ctx;
343 ctx.private_data = private_data;
344 return tdb_traverse_read(db_ctx->wtdb->tdb, db_tdb_traverse_read_func, &ctx);
347 static int db_tdb_get_seqnum(struct db_context *db)
350 struct db_tdb_ctx *db_ctx =
351 talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
352 return tdb_get_seqnum(db_ctx->wtdb->tdb);
355 static int db_tdb_transaction_start(struct db_context *db)
357 struct db_tdb_ctx *db_ctx =
358 talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
359 return tdb_transaction_start(db_ctx->wtdb->tdb) ? -1 : 0;
362 static int db_tdb_transaction_commit(struct db_context *db)
364 struct db_tdb_ctx *db_ctx =
365 talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
366 return tdb_transaction_commit(db_ctx->wtdb->tdb) ? -1 : 0;
369 static int db_tdb_transaction_cancel(struct db_context *db)
371 struct db_tdb_ctx *db_ctx =
372 talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
373 tdb_transaction_cancel(db_ctx->wtdb->tdb);
377 static void db_tdb_id(struct db_context *db, const uint8_t **id, size_t *idlen)
379 struct db_tdb_ctx *db_ctx =
380 talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
381 *id = (uint8_t *)&db_ctx->id;
382 *idlen = sizeof(db_ctx->id);
385 struct db_context *db_open_tdb(TALLOC_CTX *mem_ctx,
386 struct loadparm_context *lp_ctx,
388 int hash_size, int tdb_flags,
389 int open_flags, mode_t mode,
390 enum dbwrap_lock_order lock_order)
392 struct db_context *result = NULL;
393 struct db_tdb_ctx *db_tdb;
396 /* Extra paranoia. */
397 if (name && strends(name, ".ntdb")) {
398 DEBUG(0, ("can't try to open %s with tdb!\n", name));
402 result = talloc_zero(mem_ctx, struct db_context);
403 if (result == NULL) {
404 DEBUG(0, ("talloc failed\n"));
408 result->private_data = db_tdb = talloc(result, struct db_tdb_ctx);
409 if (db_tdb == NULL) {
410 DEBUG(0, ("talloc failed\n"));
413 result->lock_order = lock_order;
415 db_tdb->wtdb = tdb_wrap_open(db_tdb, name, hash_size, tdb_flags,
416 open_flags, mode, lp_ctx);
417 if (db_tdb->wtdb == NULL) {
418 DEBUG(3, ("Could not open tdb: %s\n", strerror(errno)));
422 ZERO_STRUCT(db_tdb->id);
424 if (fstat(tdb_fd(db_tdb->wtdb->tdb), &st) == -1) {
425 DEBUG(3, ("fstat failed: %s\n", strerror(errno)));
428 db_tdb->id.dev = st.st_dev;
429 db_tdb->id.ino = st.st_ino;
431 result->fetch_locked = db_tdb_fetch_locked;
432 result->try_fetch_locked = db_tdb_try_fetch_locked;
433 result->traverse = db_tdb_traverse;
434 result->traverse_read = db_tdb_traverse_read;
435 result->parse_record = db_tdb_parse;
436 result->get_seqnum = db_tdb_get_seqnum;
437 result->persistent = ((tdb_flags & TDB_CLEAR_IF_FIRST) == 0);
438 result->transaction_start = db_tdb_transaction_start;
439 result->transaction_commit = db_tdb_transaction_commit;
440 result->transaction_cancel = db_tdb_transaction_cancel;
441 result->exists = db_tdb_exists;
442 result->wipe = db_tdb_wipe;
443 result->id = db_tdb_id;
444 result->check = db_tdb_check;
445 result->stored_callback = NULL;
449 if (result != NULL) {