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Diffstat (limited to 'source4/lib/tdb/tools/tdbbackup.c')
-rw-r--r--source4/lib/tdb/tools/tdbbackup.c186
1 files changed, 181 insertions, 5 deletions
diff --git a/source4/lib/tdb/tools/tdbbackup.c b/source4/lib/tdb/tools/tdbbackup.c
index 45beb5e292..2e728d46aa 100644
--- a/source4/lib/tdb/tools/tdbbackup.c
+++ b/source4/lib/tdb/tools/tdbbackup.c
@@ -42,8 +42,181 @@
*/
#include "replace.h"
-#include "tdb.h"
+#include "system/locale.h"
+#include "system/time.h"
#include "system/filesys.h"
+#include "tdb.h"
+
+#ifdef HAVE_GETOPT_H
+#include <getopt.h>
+#endif
+
+static int failed;
+
+static char *add_suffix(const char *name, const char *suffix)
+{
+ char *ret;
+ int len = strlen(name) + strlen(suffix) + 1;
+ ret = (char *)malloc(len);
+ if (!ret) {
+ fprintf(stderr,"Out of memory!\n");
+ exit(1);
+ }
+ snprintf(ret, len, "%s%s", name, suffix);
+ return ret;
+}
+
+static int copy_fn(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, void *state)
+{
+ TDB_CONTEXT *tdb_new = (TDB_CONTEXT *)state;
+
+ if (tdb_store(tdb_new, key, dbuf, TDB_INSERT) != 0) {
+ fprintf(stderr,"Failed to insert into %s\n", tdb_name(tdb));
+ failed = 1;
+ return 1;
+ }
+ return 0;
+}
+
+
+static int test_fn(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, void *state)
+{
+ return 0;
+}
+
+/*
+ carefully backup a tdb, validating the contents and
+ only doing the backup if its OK
+ this function is also used for restore
+*/
+static int backup_tdb(const char *old_name, const char *new_name, int hash_size)
+{
+ TDB_CONTEXT *tdb;
+ TDB_CONTEXT *tdb_new;
+ char *tmp_name;
+ struct stat st;
+ int count1, count2;
+
+ tmp_name = add_suffix(new_name, ".tmp");
+
+ /* stat the old tdb to find its permissions */
+ if (stat(old_name, &st) != 0) {
+ perror(old_name);
+ free(tmp_name);
+ return 1;
+ }
+
+ /* open the old tdb */
+ tdb = tdb_open(old_name, 0, 0, O_RDWR, 0);
+ if (!tdb) {
+ printf("Failed to open %s\n", old_name);
+ free(tmp_name);
+ return 1;
+ }
+
+ /* create the new tdb */
+ unlink(tmp_name);
+ tdb_new = tdb_open(tmp_name,
+ hash_size ? hash_size : tdb_hash_size(tdb),
+ TDB_DEFAULT, O_RDWR|O_CREAT|O_EXCL,
+ st.st_mode & 0777);
+ if (!tdb_new) {
+ perror(tmp_name);
+ free(tmp_name);
+ return 1;
+ }
+
+ /* lock the old tdb */
+ if (tdb_lockall(tdb) != 0) {
+ fprintf(stderr,"Failed to lock %s\n", old_name);
+ tdb_close(tdb);
+ tdb_close(tdb_new);
+ unlink(tmp_name);
+ free(tmp_name);
+ return 1;
+ }
+
+ failed = 0;
+
+ /* traverse and copy */
+ count1 = tdb_traverse(tdb, copy_fn, (void *)tdb_new);
+ if (count1 < 0 || failed) {
+ fprintf(stderr,"failed to copy %s\n", old_name);
+ tdb_close(tdb);
+ tdb_close(tdb_new);
+ unlink(tmp_name);
+ free(tmp_name);
+ return 1;
+ }
+
+ /* close the old tdb */
+ tdb_close(tdb);
+
+ /* close the new tdb and re-open read-only */
+ tdb_close(tdb_new);
+ tdb_new = tdb_open(tmp_name, 0, TDB_DEFAULT, O_RDONLY, 0);
+ if (!tdb_new) {
+ fprintf(stderr,"failed to reopen %s\n", tmp_name);
+ unlink(tmp_name);
+ perror(tmp_name);
+ free(tmp_name);
+ return 1;
+ }
+
+ /* traverse the new tdb to confirm */
+ count2 = tdb_traverse(tdb_new, test_fn, 0);
+ if (count2 != count1) {
+ fprintf(stderr,"failed to copy %s\n", old_name);
+ tdb_close(tdb_new);
+ unlink(tmp_name);
+ free(tmp_name);
+ return 1;
+ }
+
+ /* make sure the new tdb has reached stable storage */
+ fsync(tdb_fd(tdb_new));
+
+ /* close the new tdb and rename it to .bak */
+ tdb_close(tdb_new);
+ unlink(new_name);
+ if (rename(tmp_name, new_name) != 0) {
+ perror(new_name);
+ free(tmp_name);
+ return 1;
+ }
+
+ free(tmp_name);
+
+ return 0;
+}
+
+/*
+ verify a tdb and if it is corrupt then restore from *.bak
+*/
+static int verify_tdb(const char *fname, const char *bak_name)
+{
+ TDB_CONTEXT *tdb;
+ int count = -1;
+
+ /* open the tdb */
+ tdb = tdb_open(fname, 0, 0, O_RDONLY, 0);
+
+ /* traverse the tdb, then close it */
+ if (tdb) {
+ count = tdb_traverse(tdb, test_fn, NULL);
+ tdb_close(tdb);
+ }
+
+ /* count is < 0 means an error */
+ if (count < 0) {
+ printf("restoring %s\n", fname);
+ return backup_tdb(bak_name, fname, 0);
+ }
+
+ printf("%s : %d records\n", fname, count);
+
+ return 0;
+}
/*
see if one file is newer than another
@@ -66,6 +239,7 @@ static void usage(void)
printf(" -h this help message\n");
printf(" -s suffix set the backup suffix\n");
printf(" -v verify mode (restore if corrupt)\n");
+ printf(" -n hashsize set the new hash size for the backup\n");
}
@@ -75,11 +249,10 @@ static void usage(void)
int ret = 0;
int c;
int verify = 0;
+ int hashsize = 0;
const char *suffix = ".bak";
- extern int optind;
- extern char *optarg;
- while ((c = getopt(argc, argv, "vhs:")) != -1) {
+ while ((c = getopt(argc, argv, "vhs:n:")) != -1) {
switch (c) {
case 'h':
usage();
@@ -90,6 +263,9 @@ static void usage(void)
case 's':
suffix = optarg;
break;
+ case 'n':
+ hashsize = atoi(optarg);
+ break;
}
}
@@ -113,7 +289,7 @@ static void usage(void)
}
} else {
if (file_newer(fname, bak_name) &&
- backup_tdb(fname, bak_name) != 0) {
+ backup_tdb(fname, bak_name, hashsize) != 0) {
ret = 1;
}
}