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