+++ /dev/null
- /*
- 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_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_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
- "Could not allocate new database header");
- }
-
- /* 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) {
- ret = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
- "tdb1_new_database: lseek failed");
- goto fail;
- }
-
- if (ftruncate(tdb->file->fd, 0) == -1) {
- ret = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
- "tdb1_new_database: ftruncate failed");
- goto fail;
- }
-
- if (!tdb1_write_all(tdb->file->fd, newdb, size)) {
- ret = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
- "tdb1_new_database: write failed");
- goto fail;
- }
- 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;
-}
projects / ccan / blobdiff