move the dbwrap library to the top level

Autobuild-User: Michael Adam <obnox@samba.org>
Autobuild-Date: Mon May 14 04:04:55 CEST 2012 on sn-devel-104

1 files changed, 447 insertions, 0 deletions

diff --git a/lib/dbwrap/dbwrap_tdb.c b/lib/dbwrap/dbwrap_tdb.c
new file mode 100644
index 00000000000..398d41a7db2
--- /dev/null
+++ b/lib/dbwrap/dbwrap_tdb.c
@@ -0,0 +1,447 @@
+/*
+   Unix SMB/CIFS implementation.
+   Database interface wrapper around tdb
+   Copyright (C) Volker Lendecke 2005-2007
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "dbwrap/dbwrap.h"
+#include "dbwrap/dbwrap_private.h"
+#include "dbwrap/dbwrap_tdb.h"
+#include "lib/tdb_wrap/tdb_wrap.h"
+#include "lib/util/util_tdb.h"
+#include "system/filesys.h"
+
+struct db_tdb_ctx {
+	struct tdb_wrap *wtdb;
+
+	struct {
+		dev_t dev;
+		ino_t ino;
+	} id;
+};
+
+static NTSTATUS db_tdb_store(struct db_record *rec, TDB_DATA data, int flag);
+static NTSTATUS db_tdb_delete(struct db_record *rec);
+
+static void db_tdb_log_key(const char *prefix, TDB_DATA key)
+{
+	size_t len;
+	char *keystr;
+
+	if (DEBUGLEVEL < 10) {
+		return;
+	}
+	len = key.dsize;
+	if (DEBUGLEVEL == 10) {
+		/*
+		 * Only fully spam at debuglevel > 10
+		 */
+		len = MIN(10, key.dsize);
+	}
+	keystr = hex_encode_talloc(talloc_tos(), (unsigned char *)(key.dptr),
+				   len);
+	DEBUG(10, ("%s key %s\n", prefix, keystr));
+	TALLOC_FREE(keystr);
+}
+
+static int db_tdb_record_destr(struct db_record* data)
+{
+	struct db_tdb_ctx *ctx =
+		talloc_get_type_abort(data->private_data, struct db_tdb_ctx);
+
+	db_tdb_log_key("Unlocking", data->key);
+	tdb_chainunlock(ctx->wtdb->tdb, data->key);
+	return 0;
+}
+
+struct tdb_fetch_locked_state {
+	TALLOC_CTX *mem_ctx;
+	struct db_record *result;
+};
+
+static int db_tdb_fetchlock_parse(TDB_DATA key, TDB_DATA data,
+				  void *private_data)
+{
+	struct tdb_fetch_locked_state *state =
+		(struct tdb_fetch_locked_state *)private_data;
+	struct db_record *result;
+
+	result = (struct db_record *)talloc_size(
+		state->mem_ctx,
+		sizeof(struct db_record) + key.dsize + data.dsize);
+
+	if (result == NULL) {
+		return 0;
+	}
+	state->result = result;
+
+	result->key.dsize = key.dsize;
+	result->key.dptr = ((uint8_t *)result) + sizeof(struct db_record);
+	memcpy(result->key.dptr, key.dptr, key.dsize);
+
+	result->value.dsize = data.dsize;
+
+	if (data.dsize > 0) {
+		result->value.dptr = result->key.dptr+key.dsize;
+		memcpy(result->value.dptr, data.dptr, data.dsize);
+	}
+	else {
+		result->value.dptr = NULL;
+	}
+
+	return 0;
+}
+
+static struct db_record *db_tdb_fetch_locked_internal(
+	struct db_context *db, TALLOC_CTX *mem_ctx, TDB_DATA key)
+{
+	struct db_tdb_ctx *ctx = talloc_get_type_abort(db->private_data,
+						       struct db_tdb_ctx);
+	struct tdb_fetch_locked_state state;
+
+	state.mem_ctx = mem_ctx;
+	state.result = NULL;
+
+	if ((tdb_parse_record(ctx->wtdb->tdb, key, db_tdb_fetchlock_parse,
+			      &state) < 0) &&
+	    (tdb_error(ctx->wtdb->tdb) != TDB_ERR_NOEXIST)) {
+		tdb_chainunlock(ctx->wtdb->tdb, key);
+		return NULL;
+	}
+
+	if (state.result == NULL) {
+		db_tdb_fetchlock_parse(key, tdb_null, &state);
+	}
+
+	if (state.result == NULL) {
+		tdb_chainunlock(ctx->wtdb->tdb, key);
+		return NULL;
+	}
+
+	talloc_set_destructor(state.result, db_tdb_record_destr);
+
+	state.result->private_data = talloc_reference(state.result, ctx);
+	state.result->store = db_tdb_store;
+	state.result->delete_rec = db_tdb_delete;
+
+	DEBUG(10, ("Allocated locked data 0x%p\n", state.result));
+
+	return state.result;
+}
+
+static struct db_record *db_tdb_fetch_locked(
+	struct db_context *db, TALLOC_CTX *mem_ctx, TDB_DATA key)
+{
+	struct db_tdb_ctx *ctx = talloc_get_type_abort(db->private_data,
+						       struct db_tdb_ctx);
+
+	db_tdb_log_key("Locking", key);
+	if (tdb_chainlock(ctx->wtdb->tdb, key) != 0) {
+		DEBUG(3, ("tdb_chainlock failed\n"));
+		return NULL;
+	}
+	return db_tdb_fetch_locked_internal(db, mem_ctx, key);
+}
+
+static struct db_record *db_tdb_try_fetch_locked(
+	struct db_context *db, TALLOC_CTX *mem_ctx, TDB_DATA key)
+{
+	struct db_tdb_ctx *ctx = talloc_get_type_abort(db->private_data,
+						       struct db_tdb_ctx);
+
+	db_tdb_log_key("Trying to lock", key);
+	if (tdb_chainlock_nonblock(ctx->wtdb->tdb, key) != 0) {
+		DEBUG(3, ("tdb_chainlock_nonblock failed\n"));
+		return NULL;
+	}
+	return db_tdb_fetch_locked_internal(db, mem_ctx, key);
+}
+
+
+static int db_tdb_exists(struct db_context *db, TDB_DATA key)
+{
+	struct db_tdb_ctx *ctx = talloc_get_type_abort(
+		db->private_data, struct db_tdb_ctx);
+	return tdb_exists(ctx->wtdb->tdb, key);
+}
+
+static int db_tdb_wipe(struct db_context *db)
+{
+	struct db_tdb_ctx *ctx = talloc_get_type_abort(
+		db->private_data, struct db_tdb_ctx);
+	return tdb_wipe_all(ctx->wtdb->tdb);
+}
+
+struct db_tdb_parse_state {
+	void (*parser)(TDB_DATA key, TDB_DATA data,
+		       void *private_data);
+	void *private_data;
+};
+
+/*
+ * tdb_parse_record expects a parser returning int, mixing up tdb and
+ * parser errors. Wrap around that by always returning 0 and have
+ * dbwrap_parse_record expect a parser returning void.
+ */
+
+static int db_tdb_parser(TDB_DATA key, TDB_DATA data, void *private_data)
+{
+	struct db_tdb_parse_state *state =
+		(struct db_tdb_parse_state *)private_data;
+	state->parser(key, data, state->private_data);
+	return 0;
+}
+
+static NTSTATUS db_tdb_parse(struct db_context *db, TDB_DATA key,
+			     void (*parser)(TDB_DATA key, TDB_DATA data,
+					   void *private_data),
+			     void *private_data)
+{
+	struct db_tdb_ctx *ctx = talloc_get_type_abort(
+		db->private_data, struct db_tdb_ctx);
+	struct db_tdb_parse_state state;
+	int ret;
+
+	state.parser = parser;
+	state.private_data = private_data;
+
+	ret = tdb_parse_record(ctx->wtdb->tdb, key, db_tdb_parser, &state);
+
+	if (ret != 0) {
+		return map_nt_error_from_tdb(tdb_error(ctx->wtdb->tdb));
+	}
+	return NT_STATUS_OK;
+}
+
+static NTSTATUS db_tdb_store(struct db_record *rec, TDB_DATA data, int flag)
+{
+	struct db_tdb_ctx *ctx = talloc_get_type_abort(rec->private_data,
+						       struct db_tdb_ctx);
+
+	/*
+	 * This has a bug: We need to replace rec->value for correct
+	 * operation, but right now brlock and locking don't use the value
+	 * anymore after it was stored.
+	 */
+
+	return (tdb_store(ctx->wtdb->tdb, rec->key, data, flag) == 0) ?
+		NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL;
+}
+
+static NTSTATUS db_tdb_delete(struct db_record *rec)
+{
+	struct db_tdb_ctx *ctx = talloc_get_type_abort(rec->private_data,
+						       struct db_tdb_ctx);
+
+	if (tdb_delete(ctx->wtdb->tdb, rec->key) == 0) {
+		return NT_STATUS_OK;
+	}
+
+	if (tdb_error(ctx->wtdb->tdb) == TDB_ERR_NOEXIST) {
+		return NT_STATUS_NOT_FOUND;
+	}
+
+	return NT_STATUS_UNSUCCESSFUL;
+}
+
+struct db_tdb_traverse_ctx {
+	struct db_context *db;
+	int (*f)(struct db_record *rec, void *private_data);
+	void *private_data;
+};
+
+static int db_tdb_traverse_func(TDB_CONTEXT *tdb, TDB_DATA kbuf, TDB_DATA dbuf,
+				void *private_data)
+{
+	struct db_tdb_traverse_ctx *ctx =
+		(struct db_tdb_traverse_ctx *)private_data;
+	struct db_record rec;
+
+	rec.key = kbuf;
+	rec.value = dbuf;
+	rec.store = db_tdb_store;
+	rec.delete_rec = db_tdb_delete;
+	rec.private_data = ctx->db->private_data;
+	rec.db = ctx->db;
+
+	return ctx->f(&rec, ctx->private_data);
+}
+
+static int db_tdb_traverse(struct db_context *db,
+			   int (*f)(struct db_record *rec, void *private_data),
+			   void *private_data)
+{
+	struct db_tdb_ctx *db_ctx =
+		talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
+	struct db_tdb_traverse_ctx ctx;
+
+	ctx.db = db;
+	ctx.f = f;
+	ctx.private_data = private_data;
+	return tdb_traverse(db_ctx->wtdb->tdb, db_tdb_traverse_func, &ctx);
+}
+
+static NTSTATUS db_tdb_store_deny(struct db_record *rec, TDB_DATA data, int flag)
+{
+	return NT_STATUS_MEDIA_WRITE_PROTECTED;
+}
+
+static NTSTATUS db_tdb_delete_deny(struct db_record *rec)
+{
+	return NT_STATUS_MEDIA_WRITE_PROTECTED;
+}
+
+static int db_tdb_traverse_read_func(TDB_CONTEXT *tdb, TDB_DATA kbuf, TDB_DATA dbuf,
+				void *private_data)
+{
+	struct db_tdb_traverse_ctx *ctx =
+		(struct db_tdb_traverse_ctx *)private_data;
+	struct db_record rec;
+
+	rec.key = kbuf;
+	rec.value = dbuf;
+	rec.store = db_tdb_store_deny;
+	rec.delete_rec = db_tdb_delete_deny;
+	rec.private_data = ctx->db->private_data;
+	rec.db = ctx->db;
+
+	return ctx->f(&rec, ctx->private_data);
+}
+
+static int db_tdb_traverse_read(struct db_context *db,
+			   int (*f)(struct db_record *rec, void *private_data),
+			   void *private_data)
+{
+	struct db_tdb_ctx *db_ctx =
+		talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
+	struct db_tdb_traverse_ctx ctx;
+
+	ctx.db = db;
+	ctx.f = f;
+	ctx.private_data = private_data;
+	return tdb_traverse_read(db_ctx->wtdb->tdb, db_tdb_traverse_read_func, &ctx);
+}
+
+static int db_tdb_get_seqnum(struct db_context *db)
+
+{
+	struct db_tdb_ctx *db_ctx =
+		talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
+	return tdb_get_seqnum(db_ctx->wtdb->tdb);
+}
+
+static int db_tdb_get_flags(struct db_context *db)
+
+{
+	struct db_tdb_ctx *db_ctx =
+		talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
+	return tdb_get_flags(db_ctx->wtdb->tdb);
+}
+
+static int db_tdb_transaction_start(struct db_context *db)
+{
+	struct db_tdb_ctx *db_ctx =
+		talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
+	return tdb_transaction_start(db_ctx->wtdb->tdb) ? -1 : 0;
+}
+
+static int db_tdb_transaction_commit(struct db_context *db)
+{
+	struct db_tdb_ctx *db_ctx =
+		talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
+	return tdb_transaction_commit(db_ctx->wtdb->tdb) ? -1 : 0;
+}
+
+static int db_tdb_transaction_cancel(struct db_context *db)
+{
+	struct db_tdb_ctx *db_ctx =
+		talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
+	tdb_transaction_cancel(db_ctx->wtdb->tdb);
+	return 0;
+}
+
+static void db_tdb_id(struct db_context *db, const uint8_t **id, size_t *idlen)
+{
+	struct db_tdb_ctx *db_ctx =
+		talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
+	*id = (uint8_t *)&db_ctx->id;
+	*idlen = sizeof(db_ctx->id);
+}
+
+struct db_context *db_open_tdb(TALLOC_CTX *mem_ctx,
+			       struct loadparm_context *lp_ctx,
+			       const char *name,
+			       int hash_size, int tdb_flags,
+			       int open_flags, mode_t mode,
+			       enum dbwrap_lock_order lock_order)
+{
+	struct db_context *result = NULL;
+	struct db_tdb_ctx *db_tdb;
+	struct stat st;
+
+	result = talloc_zero(mem_ctx, struct db_context);
+	if (result == NULL) {
+		DEBUG(0, ("talloc failed\n"));
+		goto fail;
+	}
+
+	result->private_data = db_tdb = talloc(result, struct db_tdb_ctx);
+	if (db_tdb == NULL) {
+		DEBUG(0, ("talloc failed\n"));
+		goto fail;
+	}
+	result->lock_order = lock_order;
+
+	db_tdb->wtdb = tdb_wrap_open(db_tdb, name, hash_size, tdb_flags,
+				     open_flags, mode, lp_ctx);
+	if (db_tdb->wtdb == NULL) {
+		DEBUG(3, ("Could not open tdb: %s\n", strerror(errno)));
+		goto fail;
+	}
+
+	ZERO_STRUCT(db_tdb->id);
+
+	if (fstat(tdb_fd(db_tdb->wtdb->tdb), &st) == -1) {
+		DEBUG(3, ("fstat failed: %s\n", strerror(errno)));
+		goto fail;
+	}
+	db_tdb->id.dev = st.st_dev;
+	db_tdb->id.ino = st.st_ino;
+
+	result->fetch_locked = db_tdb_fetch_locked;
+	result->try_fetch_locked = db_tdb_try_fetch_locked;
+	result->traverse = db_tdb_traverse;
+	result->traverse_read = db_tdb_traverse_read;
+	result->parse_record = db_tdb_parse;
+	result->get_seqnum = db_tdb_get_seqnum;
+	result->get_flags = db_tdb_get_flags;
+	result->persistent = ((tdb_flags & TDB_CLEAR_IF_FIRST) == 0);
+	result->transaction_start = db_tdb_transaction_start;
+	result->transaction_commit = db_tdb_transaction_commit;
+	result->transaction_cancel = db_tdb_transaction_cancel;
+	result->exists = db_tdb_exists;
+	result->wipe = db_tdb_wipe;
+	result->id = db_tdb_id;
+	result->stored_callback = NULL;
+	return result;
+
+ fail:
+	if (result != NULL) {
+		TALLOC_FREE(result);
+	}
+	return NULL;
+}