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5ac4a56b GKH |
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 | #include <errno.h> | |
45 | #include <stdlib.h> | |
46 | #include <stdio.h> | |
47 | #include <fcntl.h> | |
48 | #include <unistd.h> | |
49 | #include <string.h> | |
50 | #include <fcntl.h> | |
51 | #include <time.h> | |
52 | #include <sys/mman.h> | |
53 | #include <sys/stat.h> | |
54 | #include <sys/time.h> | |
55 | #include <ctype.h> | |
56 | #include <signal.h> | |
57 | #include "tdb.h" | |
58 | #include "tdbback.h" | |
59 | ||
60 | /* | |
61 | see if one file is newer than another | |
62 | */ | |
63 | static int file_newer(const char *fname1, const char *fname2) | |
64 | { | |
65 | struct stat st1, st2; | |
66 | if (stat(fname1, &st1) != 0) { | |
67 | return 0; | |
68 | } | |
69 | if (stat(fname2, &st2) != 0) { | |
70 | return 1; | |
71 | } | |
72 | return (st1.st_mtime > st2.st_mtime); | |
73 | } | |
74 | ||
75 | static void usage(void) | |
76 | { | |
77 | printf("Usage: tdbbackup [options] <fname...>\n\n"); | |
78 | printf(" -h this help message\n"); | |
79 | printf(" -s suffix set the backup suffix\n"); | |
80 | printf(" -v verify mode (restore if corrupt)\n"); | |
81 | } | |
82 | ||
83 | ||
84 | int main(int argc, char *argv[]) | |
85 | { | |
86 | int i; | |
87 | int ret = 0; | |
88 | int c; | |
89 | int verify = 0; | |
90 | const char *suffix = ".bak"; | |
91 | extern int optind; | |
92 | extern char *optarg; | |
93 | ||
94 | while ((c = getopt(argc, argv, "vhs:")) != -1) { | |
95 | switch (c) { | |
96 | case 'h': | |
97 | usage(); | |
98 | exit(0); | |
99 | case 'v': | |
100 | verify = 1; | |
101 | break; | |
102 | case 's': | |
103 | suffix = optarg; | |
104 | break; | |
105 | } | |
106 | } | |
107 | ||
108 | argc -= optind; | |
109 | argv += optind; | |
110 | ||
111 | if (argc < 1) { | |
112 | usage(); | |
113 | exit(1); | |
114 | } | |
115 | ||
116 | for (i=0; i<argc; i++) { | |
117 | const char *fname = argv[i]; | |
118 | char *bak_name; | |
119 | ||
120 | bak_name = add_suffix(fname, suffix); | |
121 | ||
122 | if (verify) { | |
123 | if (verify_tdb(fname, bak_name) != 0) { | |
124 | ret = 1; | |
125 | } | |
126 | } else { | |
127 | if (file_newer(fname, bak_name) && | |
128 | backup_tdb(fname, bak_name) != 0) { | |
129 | ret = 1; | |
130 | } | |
131 | } | |
132 | ||
133 | free(bak_name); | |
134 | } | |
135 | ||
136 | return ret; | |
137 | } |