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138 lines
3.2 KiB
C
138 lines
3.2 KiB
C
/*
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Unix SMB/CIFS implementation.
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low level tdb backup and restore utility
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Copyright (C) Andrew Tridgell 2002
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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This program is meant for backup/restore of tdb databases. Typical usage would be:
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tdbbackup *.tdb
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when Samba shuts down cleanly, which will make a backup of all the local databases
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to *.bak files. Then on Samba startup you would use:
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tdbbackup -v *.tdb
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and this will check the databases for corruption and if corruption is detected then
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the backup will be restored.
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You may also like to do a backup on a regular basis while Samba is
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running, perhaps using cron.
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The reason this program is needed is to cope with power failures
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while Samba is running. A power failure could lead to database
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corruption and Samba will then not start correctly.
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Note that many of the databases in Samba are transient and thus
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don't need to be backed up, so you can optimise the above a little
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by only running the backup on the critical databases.
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <time.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <ctype.h>
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#include <signal.h>
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#include "tdb.h"
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#include "tdbback.h"
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/*
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see if one file is newer than another
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*/
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static int file_newer(const char *fname1, const char *fname2)
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{
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struct stat st1, st2;
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if (stat(fname1, &st1) != 0) {
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return 0;
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}
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if (stat(fname2, &st2) != 0) {
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return 1;
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}
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return (st1.st_mtime > st2.st_mtime);
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}
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static void usage(void)
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{
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printf("Usage: tdbbackup [options] <fname...>\n\n");
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printf(" -h this help message\n");
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printf(" -s suffix set the backup suffix\n");
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printf(" -v verify mode (restore if corrupt)\n");
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}
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int main(int argc, char *argv[])
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{
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int i;
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int ret = 0;
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int c;
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int verify = 0;
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const char *suffix = ".bak";
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extern int optind;
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extern char *optarg;
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while ((c = getopt(argc, argv, "vhs:")) != -1) {
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switch (c) {
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case 'h':
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usage();
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exit(0);
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case 'v':
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verify = 1;
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break;
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case 's':
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suffix = optarg;
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break;
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}
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}
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argc -= optind;
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argv += optind;
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if (argc < 1) {
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usage();
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exit(1);
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}
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for (i=0; i<argc; i++) {
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const char *fname = argv[i];
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char *bak_name;
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bak_name = add_suffix(fname, suffix);
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if (verify) {
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if (verify_tdb(fname, bak_name) != 0) {
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ret = 1;
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}
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} else {
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if (file_newer(fname, bak_name) &&
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backup_tdb(fname, bak_name) != 0) {
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ret = 1;
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}
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}
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free(bak_name);
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}
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return ret;
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}
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