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registry: Implement new semantics for existence of registry key in tdb.

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Existence of a key is defined as follows:
* If the key is a base key (without separator), the key exists
  iff the corresponding entry exist in the registry tdb.
* If the key is not a base key, the key exists, iff it exists
  in the list of subkeys of it's parent keyname's tdb entry.

Michael
(This used to be commit 477008367f)
This commit is contained in:
Michael Adam 2008-05-06 10:05:20 +02:00
parent f5cbbb5c02
commit a26880c372
1 changed files with 52 additions and 3 deletions
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55
source3/registry/reg_backend_db.c
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@ -770,15 +770,64 @@ static TDB_DATA regdb_fetch_key_internal(TALLOC_CTX *mem_ctx, const char *key)
}
/**
* Check for the existence of a key.
*
* Existence of a key is authoritatively defined by its
* existence in the list of subkeys of its parent key.
* The exeption of this are keys without a parent key,
* i.e. the "base" keys (HKLM, HKCU, ...).
*/
static bool regdb_key_exists(const char *key)
{
TALLOC_CTX *mem_ctx = talloc_stackframe();
TDB_DATA value;
bool ret;
bool ret = false;
char *path, *p;
value = regdb_fetch_key_internal(mem_ctx, key);
ret = (value.dptr != NULL);
if (key == NULL) {
goto done;
}
path = normalize_reg_path(mem_ctx, key);
if (path == NULL) {
DEBUG(0, ("out of memory! (talloc failed)\n"));
goto done;
}
if (*path == '\0') {
goto done;
}
p = strrchr(path, '/');
if (p == NULL) {
/* this is a base key */
value = regdb_fetch_key_internal(mem_ctx, path);
ret = (value.dptr != NULL);
} else {
/* get the list of subkeys of the parent key */
uint32 num_items, len, i;
fstring subkeyname;
*p = '\0';
p++;
value = regdb_fetch_key_internal(mem_ctx, path);
if (value.dptr == NULL) {
goto done;
}
len = tdb_unpack(value.dptr, value.dsize, "d", &num_items);
for (i = 0; i < num_items; i++) {
len += tdb_unpack(value.dptr +len, value.dsize -len,
"f", &subkeyname);
if (strequal(subkeyname, p)) {
ret = true;
goto done;
}
}
}
done:
TALLOC_FREE(mem_ctx);
return ret;
}