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Unix SMB/CIFS implementation.
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low level tdb backup and restore utility
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Copyright (C) Andrew Tridgell 2002
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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 2 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, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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char *add_suffix(const char *name, const char *suffix)
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int len = strlen(name) + strlen(suffix) + 1;
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fprintf(stderr,"Out of memory!\n");
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snprintf(ret, len, "%s%s", name, suffix);
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static int copy_fn(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, void *state)
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TDB_CONTEXT *tdb_new = (TDB_CONTEXT *)state;
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if (tdb_store(tdb_new, key, dbuf, TDB_INSERT) != 0) {
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fprintf(stderr,"Failed to insert into %s\n", tdb_name(tdb));
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static int test_fn(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, void *state)
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carefully backup a tdb, validating the contents and
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only doing the backup if its OK
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this function is also used for restore
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int backup_tdb(const char *old_name, const char *new_name)
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TDB_CONTEXT *tdb_new;
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tmp_name = add_suffix(new_name, ".tmp");
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/* stat the old tdb to find its permissions */
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if (stat(old_name, &st) != 0) {
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/* open the old tdb */
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tdb = tdb_open(old_name, 0, 0, O_RDWR, 0);
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printf("Failed to open %s\n", old_name);
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/* create the new tdb */
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tdb_new = tdb_open(tmp_name, tdb_hash_size(tdb),
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TDB_DEFAULT, O_RDWR|O_CREAT|O_EXCL,
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/* lock the old tdb */
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if (tdb_lockall(tdb) != 0) {
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fprintf(stderr,"Failed to lock %s\n", old_name);
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/* traverse and copy */
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count1 = tdb_traverse(tdb, copy_fn, (void *)tdb_new);
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if (count1 < 0 || failed) {
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fprintf(stderr,"failed to copy %s\n", old_name);
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/* close the old tdb */
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/* close the new tdb and re-open read-only */
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tdb_new = tdb_open(tmp_name, 0, TDB_DEFAULT, O_RDONLY, 0);
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fprintf(stderr,"failed to reopen %s\n", tmp_name);
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/* traverse the new tdb to confirm */
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count2 = tdb_traverse(tdb_new, test_fn, 0);
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if (count2 != count1) {
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fprintf(stderr,"failed to copy %s\n", old_name);
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/* make sure the new tdb has reached stable storage */
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fsync(tdb_fd(tdb_new));
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/* close the new tdb and rename it to .bak */
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if (rename(tmp_name, new_name) != 0) {
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verify a tdb and if it is corrupt then restore from *.bak
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int verify_tdb(const char *fname, const char *bak_name)
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tdb = tdb_open(fname, 0, 0, O_RDONLY, 0);
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/* traverse the tdb, then close it */
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count = tdb_traverse(tdb, test_fn, NULL);
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/* count is < 0 means an error */
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printf("restoring %s\n", fname);
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return backup_tdb(bak_name, fname);
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printf("%s : %d records\n", fname, count);