1/*
2   Unix SMB/CIFS implementation.
3   low level tdb backup and restore utility
4   Copyright (C) Andrew Tridgell              2002
5
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.
10
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.
15
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.
19*/
20
21#ifdef STANDALONE
22#if HAVE_CONFIG_H
23#include <config.h>
24#endif
25
26#include <errno.h>
27#include <stdlib.h>
28#include <stdio.h>
29#include <fcntl.h>
30#include <unistd.h>
31#include <string.h>
32#include <fcntl.h>
33#include <time.h>
34#include <sys/mman.h>
35
36#include <sys/stat.h>
37#include <sys/time.h>
38#include <ctype.h>
39#include <signal.h>
40
41#else
42#include "includes.h"
43#endif
44
45#include "tdb.h"
46
47static int failed;
48
49char *add_suffix(const char *name, const char *suffix)
50{
51	char *ret;
52	int len = strlen(name) + strlen(suffix) + 1;
53	ret = malloc(len);
54	if (!ret) {
55		fprintf(stderr,"Out of memory!\n");
56		exit(1);
57	}
58	snprintf(ret, len, "%s%s", name, suffix);
59	return ret;
60}
61
62static int copy_fn(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, void *state)
63{
64	TDB_CONTEXT *tdb_new = (TDB_CONTEXT *)state;
65
66	if (tdb_store(tdb_new, key, dbuf, TDB_INSERT) != 0) {
67		fprintf(stderr,"Failed to insert into %s\n", tdb_new->name);
68		failed = 1;
69		return 1;
70	}
71	return 0;
72}
73
74
75static int test_fn(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, void *state)
76{
77	return 0;
78}
79
80/*
81  carefully backup a tdb, validating the contents and
82  only doing the backup if its OK
83  this function is also used for restore
84*/
85int backup_tdb(const char *old_name, const char *new_name)
86{
87	TDB_CONTEXT *tdb;
88	TDB_CONTEXT *tdb_new;
89	char *tmp_name;
90	struct stat st;
91	int count1, count2;
92
93	tmp_name = add_suffix(new_name, ".tmp");
94
95	/* stat the old tdb to find its permissions */
96	if (stat(old_name, &st) != 0) {
97		perror(old_name);
98		return 1;
99	}
100
101	/* open the old tdb */
102	tdb = tdb_open(old_name, 0, 0, O_RDWR, 0);
103	if (!tdb) {
104		printf("Failed to open %s\n", old_name);
105		return 1;
106	}
107
108	/* create the new tdb */
109	unlink(tmp_name);
110	tdb_new = tdb_open(tmp_name, tdb->header.hash_size,
111			   TDB_DEFAULT, O_RDWR|O_CREAT|O_EXCL,
112			   st.st_mode & 0777);
113	if (!tdb_new) {
114		perror(tmp_name);
115		free(tmp_name);
116		return 1;
117	}
118
119	/* lock the old tdb */
120	if (tdb_lockall(tdb) != 0) {
121		fprintf(stderr,"Failed to lock %s\n", old_name);
122		tdb_close(tdb);
123		tdb_close(tdb_new);
124		unlink(tmp_name);
125		free(tmp_name);
126		return 1;
127	}
128
129	failed = 0;
130
131	/* traverse and copy */
132	count1 = tdb_traverse(tdb, copy_fn, (void *)tdb_new);
133	if (count1 < 0 || failed) {
134		fprintf(stderr,"failed to copy %s\n", old_name);
135		tdb_close(tdb);
136		tdb_close(tdb_new);
137		unlink(tmp_name);
138		free(tmp_name);
139		return 1;
140	}
141
142	/* close the old tdb */
143	tdb_close(tdb);
144
145	/* close the new tdb and re-open read-only */
146	tdb_close(tdb_new);
147	tdb_new = tdb_open(tmp_name, 0, TDB_DEFAULT, O_RDONLY, 0);
148	if (!tdb_new) {
149		fprintf(stderr,"failed to reopen %s\n", tmp_name);
150		unlink(tmp_name);
151		perror(tmp_name);
152		free(tmp_name);
153		return 1;
154	}
155
156	/* traverse the new tdb to confirm */
157	count2 = tdb_traverse(tdb_new, test_fn, 0);
158	if (count2 != count1) {
159		fprintf(stderr,"failed to copy %s\n", old_name);
160		tdb_close(tdb_new);
161		unlink(tmp_name);
162		free(tmp_name);
163		return 1;
164	}
165
166	/* make sure the new tdb has reached stable storage */
167	fsync(tdb_new->fd);
168
169	/* close the new tdb and rename it to .bak */
170	tdb_close(tdb_new);
171	unlink(new_name);
172	if (rename(tmp_name, new_name) != 0) {
173		perror(new_name);
174		free(tmp_name);
175		return 1;
176	}
177
178	free(tmp_name);
179
180	return 0;
181}
182
183
184
185/*
186  verify a tdb and if it is corrupt then restore from *.bak
187*/
188int verify_tdb(const char *fname, const char *bak_name)
189{
190	TDB_CONTEXT *tdb;
191	int count = -1;
192
193	/* open the tdb */
194	tdb = tdb_open(fname, 0, 0, O_RDONLY, 0);
195
196	/* traverse the tdb, then close it */
197	if (tdb) {
198		count = tdb_traverse(tdb, test_fn, NULL);
199		tdb_close(tdb);
200	}
201
202	/* count is < 0 means an error */
203	if (count < 0) {
204		printf("restoring %s\n", fname);
205		return backup_tdb(bak_name, fname);
206	}
207
208	printf("%s : %d records\n", fname, count);
209
210	return 0;
211}
212