return (1103515243 * value + 12345);
}
+/* We use two hashes to double-check they're using the right hash function. */
+void tdb_header_hash(struct tdb_context *tdb,
+ uint32_t *magic1_hash, uint32_t *magic2_hash)
+{
+ TDB_DATA hash_key;
+ uint32_t tdb_magic = TDB_MAGIC;
+
+ hash_key.dptr = (unsigned char *)TDB_MAGIC_FOOD;
+ hash_key.dsize = sizeof(TDB_MAGIC_FOOD);
+ *magic1_hash = tdb->hash_fn(&hash_key);
+
+ hash_key.dptr = CONVERT(tdb_magic);
+ hash_key.dsize = sizeof(tdb_magic);
+ *magic2_hash = tdb->hash_fn(&hash_key);
+
+ /* Make sure at least one hash is non-zero! */
+ if (*magic1_hash == 0 && *magic2_hash == 0)
+ *magic1_hash = 1;
+}
/* initialise a new database with a specified hash size */
static int tdb_new_database(struct tdb_context *tdb, int hash_size)
/* Fill in the header */
newdb->version = TDB_VERSION;
newdb->hash_size = hash_size;
- newdb->hashcheck = hashcheck(tdb);
+
+ tdb_header_hash(tdb, &newdb->magic1_hash, &newdb->magic2_hash);
+
if (tdb->flags & TDB_INTERNAL) {
tdb->map_size = size;
tdb->map_ptr = (char *)newdb;
{
}
-uint32_t hashcheck(struct tdb_context *tdb)
-{
- uint32_t vals[] = { TDB_VERSION, TDB_MAGIC };
- TDB_DATA hashkey = { (unsigned char *)vals, sizeof(vals) };
-
- /* If we're using the default hash, let old code still open the db. */
- if (tdb->hash_fn == default_tdb_hash)
- return 0;
-
- /* Only let new hash-aware TDB code open it (must not be zero!) */
- return (tdb->hash_fn(&hashkey) | 1);
-}
struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
int open_flags, mode_t mode,
unsigned char *vp;
uint32_t vertest;
unsigned v;
+ uint32_t magic1_hash;
+ uint32_t magic2_hash;
+ const char *hash_alg;
if (!(tdb = (struct tdb_context *)calloc(1, sizeof *tdb))) {
/* Can't log this */
tdb->log.log_fn = null_log_fn;
tdb->log.log_private = NULL;
}
- tdb->hash_fn = hash_fn ? hash_fn : default_tdb_hash;
+
+ if (hash_fn) {
+ tdb->hash_fn = hash_fn;
+ hash_alg = "user defined";
+ } else {
+ tdb->hash_fn = default_tdb_hash;
+ hash_alg = "default";
+ }
/* cache the page size */
tdb->page_size = getpagesize();
if (fstat(tdb->fd, &st) == -1)
goto fail;
- if (tdb->header.hashcheck != hashcheck(tdb)) {
- TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_open_ex: wrong hash?\n"));
+ if (tdb->header.rwlocks != 0) {
+ TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_open_ex: spinlocks no longer supported\n"));
+ goto fail;
+ }
+
+ tdb_header_hash(tdb, &magic1_hash, &magic2_hash);
+
+ if ((tdb->header.magic1_hash == 0) && (tdb->header.magic2_hash == 0)) {
+ /* older TDB without magic hash references */
+ } else if ((tdb->header.magic1_hash != magic1_hash) ||
+ (tdb->header.magic2_hash != magic2_hash)) {
+ TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_open_ex: "
+ "%s was not created with the %s hash function we are using\n"
+ "magic1_hash[0x%08X %s 0x%08X] "
+ "magic2_hash[0x%08X %s 0x%08X]\n",
+ name, hash_alg,
+ tdb->header.magic1_hash,
+ (tdb->header.magic1_hash == magic1_hash) ? "==" : "!=",
+ magic1_hash,
+ tdb->header.magic2_hash,
+ (tdb->header.magic2_hash == magic2_hash) ? "==" : "!=",
+ magic2_hash));
+ errno = EINVAL;
goto fail;
}