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/*
Unix SMB/CIFS implementation.
trivial database library
Copyright (C) Andrew Tridgell 1999-2005
Copyright (C) Paul `Rusty' Russell 2000
Copyright (C) Jeremy Allison 2000-2003
** NOTE! The following LGPL license applies to the tdb
** library. This does NOT imply that all of Samba is released
** under the LGPL
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include "tdb1_private.h"
#include <assert.h>
/* We use two hashes to double-check they're using the right hash function. */
void tdb1_header_hash(struct tdb_context *tdb,
uint32_t *magic1_hash, uint32_t *magic2_hash)
{
uint32_t tdb1_magic = TDB1_MAGIC;
*magic1_hash = tdb_hash(tdb, TDB_MAGIC_FOOD, sizeof(TDB_MAGIC_FOOD));
*magic2_hash = tdb_hash(tdb, TDB1_CONV(tdb1_magic), sizeof(tdb1_magic));
/* Make sure at least one hash is non-zero! */
if (*magic1_hash == 0 && *magic2_hash == 0)
*magic1_hash = 1;
}
static void tdb_context_init(struct tdb_context *tdb,
struct tdb_attribute_tdb1_max_dead *max_dead)
{
assert(tdb->flags & TDB_VERSION1);
tdb1_io_init(tdb);
tdb->tdb1.traverse_read = tdb->tdb1.traverse_write = 0;
memset(&tdb->tdb1.travlocks, 0, sizeof(tdb->tdb1.travlocks));
tdb->tdb1.transaction = NULL;
/* cache the page size */
tdb->tdb1.page_size = getpagesize();
if (tdb->tdb1.page_size <= 0) {
tdb->tdb1.page_size = 0x2000;
}
if (max_dead) {
tdb->tdb1.max_dead_records = max_dead->max_dead;
} else {
tdb->tdb1.max_dead_records = 0;
}
}
/* initialise a new database */
enum TDB_ERROR tdb1_new_database(struct tdb_context *tdb,
struct tdb_attribute_tdb1_hashsize *hashsize,
struct tdb_attribute_tdb1_max_dead *max_dead)
{
struct tdb1_header *newdb;
size_t size;
int hash_size = TDB1_DEFAULT_HASH_SIZE;
enum TDB_ERROR ret = TDB_ERR_IO;
tdb_context_init(tdb, max_dead);
/* Default TDB2 hash becomes default TDB1 hash. */
if (tdb->hash_fn == tdb_jenkins_hash)
tdb->hash_fn = tdb1_old_hash;
if (hashsize)
hash_size = hashsize->hsize;
/* We make it up in memory, then write it out if not internal */
size = sizeof(struct tdb1_header) + (hash_size+1)*sizeof(tdb1_off_t);
if (!(newdb = (struct tdb1_header *)calloc(size, 1))) {
return TDB_ERR_OOM;
}
/* Fill in the header */
newdb->version = TDB1_VERSION;
newdb->hash_size = hash_size;
tdb1_header_hash(tdb, &newdb->magic1_hash, &newdb->magic2_hash);
/* Make sure older tdbs (which don't check the magic hash fields)
* will refuse to open this TDB. */
if (tdb->hash_fn == tdb1_incompatible_hash)
newdb->rwlocks = TDB1_HASH_RWLOCK_MAGIC;
memcpy(&tdb->tdb1.header, newdb, sizeof(tdb->tdb1.header));
/* This creates an endian-converted db. */
TDB1_CONV(*newdb);
/* Don't endian-convert the magic food! */
memcpy(newdb->magic_food, TDB_MAGIC_FOOD, strlen(TDB_MAGIC_FOOD)+1);
if (tdb->flags & TDB_INTERNAL) {
tdb->file->map_size = size;
tdb->file->map_ptr = (char *)newdb;
return TDB_SUCCESS;
}
if (lseek(tdb->file->fd, 0, SEEK_SET) == -1)
goto fail;
if (ftruncate(tdb->file->fd, 0) == -1)
goto fail;
/* we still have "ret == TDB_ERR_IO" here */
if (tdb1_write_all(tdb->file->fd, newdb, size))
ret = TDB_SUCCESS;
fail:
SAFE_FREE(newdb);
return ret;
}
typedef void (*tdb1_log_func)(struct tdb_context *, enum tdb_log_level, enum TDB_ERROR,
const char *, void *);
typedef uint64_t (*tdb1_hash_func)(const void *key, size_t len, uint64_t seed,
void *data);
struct tdb1_logging_context {
tdb1_log_func log_fn;
void *log_private;
};
static bool hash_correct(struct tdb_context *tdb,
uint32_t *m1, uint32_t *m2)
{
/* older TDB without magic hash references */
if (tdb->tdb1.header.magic1_hash == 0
&& tdb->tdb1.header.magic2_hash == 0) {
return true;
}
tdb1_header_hash(tdb, m1, m2);
return (tdb->tdb1.header.magic1_hash == *m1 &&
tdb->tdb1.header.magic2_hash == *m2);
}
static bool check_header_hash(struct tdb_context *tdb,
uint32_t *m1, uint32_t *m2)
{
if (hash_correct(tdb, m1, m2))
return true;
/* If they use one inbuilt, try the other inbuilt hash. */
if (tdb->hash_fn == tdb1_old_hash)
tdb->hash_fn = tdb1_incompatible_hash;
else if (tdb->hash_fn == tdb1_incompatible_hash)
tdb->hash_fn = tdb1_old_hash;
else
return false;
return hash_correct(tdb, m1, m2);
}
/* We are hold the TDB open lock on tdb->fd. */
enum TDB_ERROR tdb1_open(struct tdb_context *tdb,
struct tdb_attribute_tdb1_max_dead *max_dead)
{
const char *hash_alg;
uint32_t magic1, magic2;
tdb->flags |= TDB_VERSION1;
tdb_context_init(tdb, max_dead);
/* Default TDB2 hash becomes default TDB1 hash. */
if (tdb->hash_fn == tdb_jenkins_hash) {
tdb->hash_fn = tdb1_old_hash;
hash_alg = "default";
} else if (tdb->hash_fn == tdb1_incompatible_hash)
hash_alg = "tdb1_incompatible_hash";
else
hash_alg = "the user defined";
if (tdb->tdb1.header.version != TDB1_BYTEREV(TDB1_VERSION)) {
if (tdb->flags & TDB_CONVERT) {
return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
"tdb1_open:"
" %s does not need TDB_CONVERT",
tdb->name);
}
} else {
tdb->flags |= TDB_CONVERT;
tdb1_convert(&tdb->tdb1.header, sizeof(tdb->tdb1.header));
}
if (tdb->tdb1.header.rwlocks != 0 &&
tdb->tdb1.header.rwlocks != TDB1_HASH_RWLOCK_MAGIC) {
return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
"tdb1_open: spinlocks no longer supported");
}
if (!check_header_hash(tdb, &magic1, &magic2)) {
return tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_USE_ERROR,
"tdb1_open: "
"%s was not created with %s hash function we are using\n"
"magic1_hash[0x%08X %s 0x%08X] "
"magic2_hash[0x%08X %s 0x%08X]",
tdb->name, hash_alg,
tdb->tdb1.header.magic1_hash,
(tdb->tdb1.header.magic1_hash == magic1) ? "==" : "!=",
magic1,
tdb->tdb1.header.magic2_hash,
(tdb->tdb1.header.magic2_hash == magic2) ? "==" : "!=",
magic2);
}
return TDB_SUCCESS;
}
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