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a41af25ebd
Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org>
519 lines
13 KiB
C
519 lines
13 KiB
C
/*
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Unix SMB/CIFS implementation.
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Database interface wrapper around tdb
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Copyright (C) Volker Lendecke 2005-2007
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "replace.h"
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#include "dbwrap/dbwrap.h"
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#include "dbwrap/dbwrap_private.h"
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#include "dbwrap/dbwrap_tdb.h"
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#include "lib/tdb_wrap/tdb_wrap.h"
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#include "lib/util/util_tdb.h"
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#include "lib/util/debug.h"
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#include "lib/util/samba_util.h"
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#include "system/filesys.h"
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#include "lib/param/param.h"
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#include "libcli/util/error.h"
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struct db_tdb_ctx {
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struct tdb_wrap *wtdb;
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struct {
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dev_t dev;
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ino_t ino;
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} id;
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};
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static NTSTATUS db_tdb_storev(struct db_record *rec,
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const TDB_DATA *dbufs, int num_dbufs, int flag);
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static NTSTATUS db_tdb_delete(struct db_record *rec);
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static void db_tdb_log_key(const char *prefix, TDB_DATA key)
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{
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if (DEBUGLEVEL < 10) {
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return;
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}
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if (DEBUGLEVEL == 10) {
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/*
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* Only fully spam at debuglevel > 10
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*/
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key.dsize = MIN(10, key.dsize);
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}
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if (key.dsize < 1024) {
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char keystr[key.dsize*2+1];
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hex_encode_buf(keystr, key.dptr, key.dsize);
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DBG_DEBUG("%s key %s\n", prefix, keystr);
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return;
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}
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dump_data(DEBUGLEVEL, key.dptr, key.dsize);
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}
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static int db_tdb_record_destr(struct db_record* data)
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{
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struct db_tdb_ctx *ctx =
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talloc_get_type_abort(data->private_data, struct db_tdb_ctx);
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db_tdb_log_key("Unlocking", data->key);
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tdb_chainunlock(ctx->wtdb->tdb, data->key);
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return 0;
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}
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struct tdb_fetch_locked_state {
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TALLOC_CTX *mem_ctx;
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struct db_record *result;
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};
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static int db_tdb_fetchlock_parse(TDB_DATA key, TDB_DATA data,
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void *private_data)
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{
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struct tdb_fetch_locked_state *state =
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(struct tdb_fetch_locked_state *)private_data;
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struct db_record *result;
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result = (struct db_record *)talloc_size(
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state->mem_ctx,
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sizeof(struct db_record) + key.dsize + data.dsize);
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if (result == NULL) {
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return 0;
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}
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state->result = result;
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result->key.dsize = key.dsize;
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result->key.dptr = ((uint8_t *)result) + sizeof(struct db_record);
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memcpy(result->key.dptr, key.dptr, key.dsize);
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result->value.dsize = data.dsize;
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if (data.dsize > 0) {
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result->value.dptr = result->key.dptr+key.dsize;
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memcpy(result->value.dptr, data.dptr, data.dsize);
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}
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else {
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result->value.dptr = NULL;
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}
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result->value_valid = true;
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return 0;
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}
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static struct db_record *db_tdb_fetch_locked_internal(
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struct db_context *db,
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struct db_tdb_ctx *ctx,
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TALLOC_CTX *mem_ctx,
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TDB_DATA key)
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{
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struct tdb_fetch_locked_state state;
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int ret;
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state = (struct tdb_fetch_locked_state) {
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.mem_ctx = mem_ctx,
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};
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ret = tdb_parse_record(ctx->wtdb->tdb,
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key,
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db_tdb_fetchlock_parse,
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&state);
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if ((ret < 0) && (tdb_error(ctx->wtdb->tdb) != TDB_ERR_NOEXIST)) {
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tdb_chainunlock(ctx->wtdb->tdb, key);
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return NULL;
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}
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if (state.result == NULL) {
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db_tdb_fetchlock_parse(key, tdb_null, &state);
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}
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if (state.result == NULL) {
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tdb_chainunlock(ctx->wtdb->tdb, key);
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return NULL;
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}
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talloc_set_destructor(state.result, db_tdb_record_destr);
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state.result->private_data = ctx;
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state.result->storev = db_tdb_storev;
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state.result->delete_rec = db_tdb_delete;
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DBG_DEBUG("Allocated locked data %p\n", state.result);
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return state.result;
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}
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static struct db_record *db_tdb_fetch_locked(
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struct db_context *db, TALLOC_CTX *mem_ctx, TDB_DATA key)
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{
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struct db_tdb_ctx *ctx = talloc_get_type_abort(db->private_data,
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struct db_tdb_ctx);
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db_tdb_log_key("Locking", key);
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if (tdb_chainlock(ctx->wtdb->tdb, key) != 0) {
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DEBUG(3, ("tdb_chainlock failed\n"));
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return NULL;
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}
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return db_tdb_fetch_locked_internal(db, ctx, mem_ctx, key);
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}
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static NTSTATUS db_tdb_do_locked(struct db_context *db, TDB_DATA key,
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void (*fn)(struct db_record *rec,
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TDB_DATA value,
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void *private_data),
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void *private_data)
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{
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struct db_tdb_ctx *ctx = talloc_get_type_abort(
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db->private_data, struct db_tdb_ctx);
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uint8_t *buf = NULL;
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struct db_record rec;
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int ret;
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ret = tdb_chainlock(ctx->wtdb->tdb, key);
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if (ret == -1) {
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enum TDB_ERROR err = tdb_error(ctx->wtdb->tdb);
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DBG_DEBUG("tdb_chainlock failed: %s\n",
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tdb_errorstr(ctx->wtdb->tdb));
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return map_nt_error_from_tdb(err);
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}
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ret = tdb_fetch_talloc(ctx->wtdb->tdb, key, ctx, &buf);
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if ((ret != 0) && (ret != ENOENT)) {
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DBG_DEBUG("tdb_fetch_talloc failed: %s\n",
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strerror(errno));
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tdb_chainunlock(ctx->wtdb->tdb, key);
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return map_nt_error_from_unix_common(ret);
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}
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rec = (struct db_record) {
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.db = db, .key = key,
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.value_valid = false,
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.storev = db_tdb_storev, .delete_rec = db_tdb_delete,
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.private_data = ctx
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};
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fn(&rec,
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(TDB_DATA) { .dptr = buf, .dsize = talloc_get_size(buf) },
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private_data);
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tdb_chainunlock(ctx->wtdb->tdb, key);
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talloc_free(buf);
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return NT_STATUS_OK;
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}
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static int db_tdb_exists(struct db_context *db, TDB_DATA key)
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{
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struct db_tdb_ctx *ctx = talloc_get_type_abort(
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db->private_data, struct db_tdb_ctx);
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return tdb_exists(ctx->wtdb->tdb, key);
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}
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static int db_tdb_wipe(struct db_context *db)
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{
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struct db_tdb_ctx *ctx = talloc_get_type_abort(
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db->private_data, struct db_tdb_ctx);
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return tdb_wipe_all(ctx->wtdb->tdb);
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}
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static int db_tdb_check(struct db_context *db)
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{
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struct db_tdb_ctx *ctx = talloc_get_type_abort(
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db->private_data, struct db_tdb_ctx);
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return tdb_check(ctx->wtdb->tdb, NULL, NULL);
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}
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struct db_tdb_parse_state {
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void (*parser)(TDB_DATA key, TDB_DATA data,
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void *private_data);
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void *private_data;
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};
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/*
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* tdb_parse_record expects a parser returning int, mixing up tdb and
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* parser errors. Wrap around that by always returning 0 and have
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* dbwrap_parse_record expect a parser returning void.
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*/
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static int db_tdb_parser(TDB_DATA key, TDB_DATA data, void *private_data)
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{
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struct db_tdb_parse_state *state =
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(struct db_tdb_parse_state *)private_data;
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state->parser(key, data, state->private_data);
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return 0;
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}
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static NTSTATUS db_tdb_parse(struct db_context *db, TDB_DATA key,
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void (*parser)(TDB_DATA key, TDB_DATA data,
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void *private_data),
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void *private_data)
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{
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struct db_tdb_ctx *ctx = talloc_get_type_abort(
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db->private_data, struct db_tdb_ctx);
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struct db_tdb_parse_state state;
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int ret;
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state.parser = parser;
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state.private_data = private_data;
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ret = tdb_parse_record(ctx->wtdb->tdb, key, db_tdb_parser, &state);
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if (ret != 0) {
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return map_nt_error_from_tdb(tdb_error(ctx->wtdb->tdb));
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}
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return NT_STATUS_OK;
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}
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static NTSTATUS db_tdb_storev(struct db_record *rec,
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const TDB_DATA *dbufs, int num_dbufs, int flag)
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{
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struct db_tdb_ctx *ctx = talloc_get_type_abort(rec->private_data,
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struct db_tdb_ctx);
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struct tdb_context *tdb = ctx->wtdb->tdb;
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NTSTATUS status = NT_STATUS_OK;
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int ret;
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/*
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* This has a bug: We need to replace rec->value for correct
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* operation, but right now brlock and locking don't use the value
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* anymore after it was stored.
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*/
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ret = tdb_storev(tdb, rec->key, dbufs, num_dbufs, flag);
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if (ret == -1) {
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enum TDB_ERROR err = tdb_error(tdb);
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status = map_nt_error_from_tdb(err);
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}
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return status;
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}
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static NTSTATUS db_tdb_delete(struct db_record *rec)
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{
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struct db_tdb_ctx *ctx = talloc_get_type_abort(rec->private_data,
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struct db_tdb_ctx);
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if (tdb_delete(ctx->wtdb->tdb, rec->key) == 0) {
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return NT_STATUS_OK;
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}
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if (tdb_error(ctx->wtdb->tdb) == TDB_ERR_NOEXIST) {
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return NT_STATUS_NOT_FOUND;
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}
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return NT_STATUS_UNSUCCESSFUL;
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}
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struct db_tdb_traverse_ctx {
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struct db_context *db;
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int (*f)(struct db_record *rec, void *private_data);
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void *private_data;
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};
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static int db_tdb_traverse_func(TDB_CONTEXT *tdb, TDB_DATA kbuf, TDB_DATA dbuf,
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void *private_data)
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{
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struct db_tdb_traverse_ctx *ctx =
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(struct db_tdb_traverse_ctx *)private_data;
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struct db_record rec;
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rec.key = kbuf;
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rec.value = dbuf;
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rec.value_valid = true;
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rec.storev = db_tdb_storev;
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rec.delete_rec = db_tdb_delete;
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rec.private_data = ctx->db->private_data;
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rec.db = ctx->db;
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return ctx->f(&rec, ctx->private_data);
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}
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static int db_tdb_traverse(struct db_context *db,
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int (*f)(struct db_record *rec, void *private_data),
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void *private_data)
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{
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struct db_tdb_ctx *db_ctx =
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talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
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struct db_tdb_traverse_ctx ctx;
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ctx.db = db;
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ctx.f = f;
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ctx.private_data = private_data;
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return tdb_traverse(db_ctx->wtdb->tdb, db_tdb_traverse_func, &ctx);
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}
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static NTSTATUS db_tdb_storev_deny(struct db_record *rec,
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const TDB_DATA *dbufs, int num_dbufs,
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int flag)
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{
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return NT_STATUS_MEDIA_WRITE_PROTECTED;
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}
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static NTSTATUS db_tdb_delete_deny(struct db_record *rec)
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{
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return NT_STATUS_MEDIA_WRITE_PROTECTED;
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}
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static int db_tdb_traverse_read_func(TDB_CONTEXT *tdb, TDB_DATA kbuf, TDB_DATA dbuf,
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void *private_data)
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{
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struct db_tdb_traverse_ctx *ctx =
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(struct db_tdb_traverse_ctx *)private_data;
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struct db_record rec;
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rec.key = kbuf;
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rec.value = dbuf;
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rec.value_valid = true;
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rec.storev = db_tdb_storev_deny;
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rec.delete_rec = db_tdb_delete_deny;
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rec.private_data = ctx->db->private_data;
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rec.db = ctx->db;
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return ctx->f(&rec, ctx->private_data);
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}
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static int db_tdb_traverse_read(struct db_context *db,
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int (*f)(struct db_record *rec, void *private_data),
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void *private_data)
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{
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struct db_tdb_ctx *db_ctx =
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talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
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struct db_tdb_traverse_ctx ctx;
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ctx.db = db;
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ctx.f = f;
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ctx.private_data = private_data;
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return tdb_traverse_read(db_ctx->wtdb->tdb, db_tdb_traverse_read_func, &ctx);
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}
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static int db_tdb_get_seqnum(struct db_context *db)
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{
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struct db_tdb_ctx *db_ctx =
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talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
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return tdb_get_seqnum(db_ctx->wtdb->tdb);
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}
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static int db_tdb_transaction_start(struct db_context *db)
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{
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struct db_tdb_ctx *db_ctx =
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talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
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return tdb_transaction_start(db_ctx->wtdb->tdb) ? -1 : 0;
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}
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static NTSTATUS db_tdb_transaction_start_nonblock(struct db_context *db)
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{
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struct db_tdb_ctx *db_ctx =
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talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
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int ret;
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ret = tdb_transaction_start_nonblock(db_ctx->wtdb->tdb);
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if (ret != 0) {
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return map_nt_error_from_tdb(tdb_error(db_ctx->wtdb->tdb));
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}
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return NT_STATUS_OK;
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}
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static int db_tdb_transaction_commit(struct db_context *db)
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{
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struct db_tdb_ctx *db_ctx =
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talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
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return tdb_transaction_commit(db_ctx->wtdb->tdb) ? -1 : 0;
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}
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static int db_tdb_transaction_cancel(struct db_context *db)
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{
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struct db_tdb_ctx *db_ctx =
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talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
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tdb_transaction_cancel(db_ctx->wtdb->tdb);
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return 0;
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}
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static size_t db_tdb_id(struct db_context *db, uint8_t *id, size_t idlen)
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{
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struct db_tdb_ctx *db_ctx =
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talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
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if (idlen >= sizeof(db_ctx->id)) {
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memcpy(id, &db_ctx->id, sizeof(db_ctx->id));
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}
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return sizeof(db_ctx->id);
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}
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struct db_context *db_open_tdb(TALLOC_CTX *mem_ctx,
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const char *name,
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int hash_size, int tdb_flags,
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int open_flags, mode_t mode,
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enum dbwrap_lock_order lock_order,
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uint64_t dbwrap_flags)
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{
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struct db_context *result = NULL;
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struct db_tdb_ctx *db_tdb;
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struct stat st;
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result = talloc_zero(mem_ctx, struct db_context);
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if (result == NULL) {
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DEBUG(0, ("talloc failed\n"));
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goto fail;
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}
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result->private_data = db_tdb = talloc(result, struct db_tdb_ctx);
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if (db_tdb == NULL) {
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DEBUG(0, ("talloc failed\n"));
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goto fail;
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}
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result->lock_order = lock_order;
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db_tdb->wtdb = tdb_wrap_open(db_tdb, name, hash_size, tdb_flags,
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open_flags, mode);
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if (db_tdb->wtdb == NULL) {
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DEBUG(3, ("Could not open tdb: %s\n", strerror(errno)));
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goto fail;
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}
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ZERO_STRUCT(db_tdb->id);
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if (fstat(tdb_fd(db_tdb->wtdb->tdb), &st) == -1) {
|
|
DEBUG(3, ("fstat failed: %s\n", strerror(errno)));
|
|
goto fail;
|
|
}
|
|
db_tdb->id.dev = st.st_dev;
|
|
db_tdb->id.ino = st.st_ino;
|
|
|
|
result->fetch_locked = db_tdb_fetch_locked;
|
|
result->do_locked = db_tdb_do_locked;
|
|
result->traverse = db_tdb_traverse;
|
|
result->traverse_read = db_tdb_traverse_read;
|
|
result->parse_record = db_tdb_parse;
|
|
result->get_seqnum = db_tdb_get_seqnum;
|
|
result->persistent = ((tdb_flags & TDB_CLEAR_IF_FIRST) == 0);
|
|
result->transaction_start = db_tdb_transaction_start;
|
|
result->transaction_start_nonblock = db_tdb_transaction_start_nonblock;
|
|
result->transaction_commit = db_tdb_transaction_commit;
|
|
result->transaction_cancel = db_tdb_transaction_cancel;
|
|
result->exists = db_tdb_exists;
|
|
result->wipe = db_tdb_wipe;
|
|
result->id = db_tdb_id;
|
|
result->check = db_tdb_check;
|
|
result->name = tdb_name(db_tdb->wtdb->tdb);
|
|
return result;
|
|
|
|
fail:
|
|
TALLOC_FREE(result);
|
|
return NULL;
|
|
}
|