2 Unix SMB/CIFS implementation.
3 low level tdb backup and restore utility
4 Copyright (C) Andrew Tridgell 2002
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 2 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, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
62 char *add_suffix(const char *name
, const char *suffix
)
65 int len
= strlen(name
) + strlen(suffix
) + 1;
68 fprintf(stderr
,"Out of memory!\n");
71 snprintf(ret
, len
, "%s%s", name
, suffix
);
75 static int copy_fn(TDB_CONTEXT
*tdb
, TDB_DATA key
, TDB_DATA dbuf
, void *state
)
77 TDB_CONTEXT
*tdb_new
= (TDB_CONTEXT
*)state
;
79 if (tdb_store(tdb_new
, key
, dbuf
, TDB_INSERT
) != 0) {
80 fprintf(stderr
,"Failed to insert into %s\n", tdb_new
->name
);
88 static int test_fn(TDB_CONTEXT
*tdb
, TDB_DATA key
, TDB_DATA dbuf
, void *state
)
94 carefully backup a tdb, validating the contents and
95 only doing the backup if its OK
96 this function is also used for restore
98 int backup_tdb(const char *old_name
, const char *new_name
, int hash_size
)
101 TDB_CONTEXT
*tdb_new
;
106 tmp_name
= add_suffix(new_name
, ".tmp");
108 /* stat the old tdb to find its permissions */
109 if (stat(old_name
, &st
) != 0) {
115 /* open the old tdb */
116 tdb
= tdb_open(old_name
, 0, 0, O_RDWR
, 0);
118 printf("Failed to open %s\n", old_name
);
123 /* create the new tdb */
125 tdb_new
= tdb_open(tmp_name
, hash_size
? hash_size
: tdb
->header
.hash_size
,
126 TDB_DEFAULT
, O_RDWR
|O_CREAT
|O_EXCL
,
134 /* lock the old tdb */
135 if (tdb_lockall(tdb
) != 0) {
136 fprintf(stderr
,"Failed to lock %s\n", old_name
);
146 /* traverse and copy */
147 count1
= tdb_traverse(tdb
, copy_fn
, (void *)tdb_new
);
148 if (count1
< 0 || failed
) {
149 fprintf(stderr
,"failed to copy %s\n", old_name
);
157 /* close the old tdb */
160 /* close the new tdb and re-open read-only */
162 tdb_new
= tdb_open(tmp_name
, 0, TDB_DEFAULT
, O_RDONLY
, 0);
164 fprintf(stderr
,"failed to reopen %s\n", tmp_name
);
171 /* traverse the new tdb to confirm */
172 count2
= tdb_traverse(tdb_new
, test_fn
, 0);
173 if (count2
!= count1
) {
174 fprintf(stderr
,"failed to copy %s\n", old_name
);
181 /* make sure the new tdb has reached stable storage */
184 /* close the new tdb and rename it to .bak */
187 if (rename(tmp_name
, new_name
) != 0) {
201 verify a tdb and if it is corrupt then restore from *.bak
203 int verify_tdb(const char *fname
, const char *bak_name
)
209 tdb
= tdb_open(fname
, 0, 0, O_RDONLY
, 0);
211 /* traverse the tdb, then close it */
213 count
= tdb_traverse(tdb
, test_fn
, NULL
);
217 /* count is < 0 means an error */
219 printf("restoring %s\n", fname
);
220 return backup_tdb(bak_name
, fname
, 0);
223 printf("%s : %d records\n", fname
, count
);