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/*
22
23  This program is meant for backup/restore of tdb databases. Typical usage would be:
24     tdbbackup *.tdb
25  when Samba shuts down cleanly, which will make a backup of all the local databases
26  to *.bak files. Then on Samba startup you would use:
27     tdbbackup -v *.tdb
28  and this will check the databases for corruption and if corruption is detected then
29  the backup will be restored.
30
31  You may also like to do a backup on a regular basis while Samba is
32  running, perhaps using cron.
33
34  The reason this program is needed is to cope with power failures
35  while Samba is running. A power failure could lead to database
36  corruption and Samba will then not start correctly.
37
38  Note that many of the databases in Samba are transient and thus
39  don't need to be backed up, so you can optimise the above a little
40  by only running the backup on the critical databases.
41
42 */
43
44#ifdef STANDALONE
45#if HAVE_CONFIG_H
46#include <config.h>
47#endif
48
49#include <errno.h>
50#include <stdlib.h>
51#include <stdio.h>
52#include <fcntl.h>
53#include <unistd.h>
54#include <string.h>
55#include <fcntl.h>
56#include <time.h>
57#include <sys/mman.h>
58#include <sys/stat.h>
59#include <sys/time.h>
60#include <ctype.h>
61#include <signal.h>
62
63#else
64
65#include "includes.h"
66
67#endif
68
69#include "tdb.h"
70#include "tdbback.h"
71
72/*
73  see if one file is newer than another
74*/
75static int file_newer(const char *fname1, const char *fname2)
76{
77	struct stat st1, st2;
78	if (stat(fname1, &st1) != 0) {
79		return 0;
80	}
81	if (stat(fname2, &st2) != 0) {
82		return 1;
83	}
84	return (st1.st_mtime > st2.st_mtime);
85}
86
87static void usage(void)
88{
89	printf("Usage: tdbbackup [options] <fname...>\n\n");
90	printf("   -h            this help message\n");
91	printf("   -s suffix     set the backup suffix\n");
92	printf("   -v            verify mode (restore if corrupt)\n");
93}
94
95
96 int main(int argc, char *argv[])
97{
98	int i;
99	int ret = 0;
100	int c;
101	int verify = 0;
102	const char *suffix = ".bak";
103	extern int optind;
104	extern char *optarg;
105
106	while ((c = getopt(argc, argv, "vhs:")) != -1) {
107		switch (c) {
108		case 'h':
109			usage();
110			exit(0);
111		case 'v':
112			verify = 1;
113			break;
114		case 's':
115			suffix = optarg;
116			break;
117		}
118	}
119
120	argc -= optind;
121	argv += optind;
122
123	if (argc < 1) {
124		usage();
125		exit(1);
126	}
127
128	for (i=0; i<argc; i++) {
129		const char *fname = argv[i];
130		char *bak_name;
131
132		bak_name = add_suffix(fname, suffix);
133
134		if (verify) {
135			if (verify_tdb(fname, bak_name) != 0) {
136				ret = 1;
137			}
138		} else {
139			if (file_newer(fname, bak_name) &&
140			    backup_tdb(fname, bak_name) != 0) {
141				ret = 1;
142			}
143		}
144
145		free(bak_name);
146	}
147
148	return ret;
149}
150