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