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;
66 ret = (char *)malloc(len);
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_name(tdb));
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,
126 hash_size ? hash_size : tdb_hash_size(tdb),
127 TDB_DEFAULT, O_RDWR|O_CREAT|O_EXCL,
135 /* lock the old tdb */
136 if (tdb_lockall(tdb) != 0) {
137 fprintf(stderr,"Failed to lock %s\n", old_name);
147 /* traverse and copy */
148 count1 = tdb_traverse(tdb, copy_fn, (void *)tdb_new);
149 if (count1 < 0 || failed) {
150 fprintf(stderr,"failed to copy %s\n", old_name);
158 /* close the old tdb */
161 /* close the new tdb and re-open read-only */
163 tdb_new = tdb_open(tmp_name, 0, TDB_DEFAULT, O_RDONLY, 0);
165 fprintf(stderr,"failed to reopen %s\n", tmp_name);
172 /* traverse the new tdb to confirm */
173 count2 = tdb_traverse(tdb_new, test_fn, 0);
174 if (count2 != count1) {
175 fprintf(stderr,"failed to copy %s\n", old_name);
182 /* make sure the new tdb has reached stable storage */
183 fsync(tdb_fd(tdb_new));
185 /* close the new tdb and rename it to .bak */
188 if (rename(tmp_name, new_name) != 0) {
202 verify a tdb and if it is corrupt then restore from *.bak
204 int verify_tdb(const char *fname, const char *bak_name)
210 tdb = tdb_open(fname, 0, 0, O_RDONLY, 0);
212 /* traverse the tdb, then close it */
214 count = tdb_traverse(tdb, test_fn, NULL);
218 /* count is < 0 means an error */
220 printf("restoring %s\n", fname);
221 return backup_tdb(bak_name, fname, 0);
224 printf("%s : %d records\n", fname, count);