1 files changed, 340 insertions, 0 deletions
diff --git a/lib/util/util_tdb.c b/lib/util/util_tdb.c
new file mode 100644
index 0000000000..2d6012c9f4
--- /dev/null
+++ b/lib/util/util_tdb.c
@@ -0,0 +1,340 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   tdb utility functions
+
+   Copyright (C) Andrew Tridgell 1992-2006
+   
+   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 "../tdb/include/tdb.h"
+#include "../lib/util/util_tdb.h"
+
+/* these are little tdb utility functions that are meant to make
+   dealing with a tdb database a little less cumbersome in Samba */
+
+/***************************************************************
+ Make a TDB_DATA and keep the const warning in one place
+****************************************************************/
+
+TDB_DATA make_tdb_data(const uint8_t *dptr, size_t dsize)
+{
+	TDB_DATA ret;
+	ret.dptr = discard_const_p(uint8_t, dptr);
+	ret.dsize = dsize;
+	return ret;
+}
+
+TDB_DATA string_tdb_data(const char *string)
+{
+	return make_tdb_data((const uint8_t *)string, string ? strlen(string) : 0 );
+}
+
+TDB_DATA string_term_tdb_data(const char *string)
+{
+	return make_tdb_data((const uint8_t *)string, string ? strlen(string) + 1 : 0);
+}
+
+/****************************************************************************
+ Lock a chain by string. Return -1 if lock failed.
+****************************************************************************/
+
+int tdb_lock_bystring(struct tdb_context *tdb, const char *keyval)
+{
+	TDB_DATA key = string_term_tdb_data(keyval);
+	
+	return tdb_chainlock(tdb, key);
+}
+
+/****************************************************************************
+ Unlock a chain by string.
+****************************************************************************/
+
+void tdb_unlock_bystring(struct tdb_context *tdb, const char *keyval)
+{
+	TDB_DATA key = string_term_tdb_data(keyval);
+
+	tdb_chainunlock(tdb, key);
+}
+
+/****************************************************************************
+ Read lock a chain by string. Return -1 if lock failed.
+****************************************************************************/
+
+int tdb_read_lock_bystring(struct tdb_context *tdb, const char *keyval)
+{
+	TDB_DATA key = string_term_tdb_data(keyval);
+	
+	return tdb_chainlock_read(tdb, key);
+}
+
+/****************************************************************************
+ Read unlock a chain by string.
+****************************************************************************/
+
+void tdb_read_unlock_bystring(struct tdb_context *tdb, const char *keyval)
+{
+	TDB_DATA key = string_term_tdb_data(keyval);
+	
+	tdb_chainunlock_read(tdb, key);
+}
+
+
+/****************************************************************************
+ Fetch a int32_t value by a arbitrary blob key, return -1 if not found.
+ Output is int32_t in native byte order.
+****************************************************************************/
+
+int32_t tdb_fetch_int32_byblob(struct tdb_context *tdb, TDB_DATA key)
+{
+	TDB_DATA data;
+	int32_t ret;
+
+	data = tdb_fetch(tdb, key);
+	if (!data.dptr || data.dsize != sizeof(int32_t)) {
+		SAFE_FREE(data.dptr);
+		return -1;
+	}
+
+	ret = IVAL(data.dptr,0);
+	SAFE_FREE(data.dptr);
+	return ret;
+}
+
+/****************************************************************************
+ Fetch a int32_t value by string key, return -1 if not found.
+ Output is int32_t in native byte order.
+****************************************************************************/
+
+int32_t tdb_fetch_int32(struct tdb_context *tdb, const char *keystr)
+{
+	return tdb_fetch_int32_byblob(tdb, string_term_tdb_data(keystr));
+}
+
+/****************************************************************************
+ Store a int32_t value by an arbitary blob key, return 0 on success, -1 on failure.
+ Input is int32_t in native byte order. Output in tdb is in little-endian.
+****************************************************************************/
+
+int tdb_store_int32_byblob(struct tdb_context *tdb, TDB_DATA key, int32_t v)
+{
+	TDB_DATA data;
+	int32_t v_store;
+
+	SIVAL(&v_store,0,v);
+	data.dptr = (unsigned char *)&v_store;
+	data.dsize = sizeof(int32_t);
+
+	return tdb_store(tdb, key, data, TDB_REPLACE);
+}
+
+/****************************************************************************
+ Store a int32_t value by string key, return 0 on success, -1 on failure.
+ Input is int32_t in native byte order. Output in tdb is in little-endian.
+****************************************************************************/
+
+int tdb_store_int32(struct tdb_context *tdb, const char *keystr, int32_t v)
+{
+	return tdb_store_int32_byblob(tdb, string_term_tdb_data(keystr), v);
+}
+
+/****************************************************************************
+ Fetch a uint32_t value by a arbitrary blob key, return -1 if not found.
+ Output is uint32_t in native byte order.
+****************************************************************************/
+
+bool tdb_fetch_uint32_byblob(struct tdb_context *tdb, TDB_DATA key, uint32_t *value)
+{
+	TDB_DATA data;
+
+	data = tdb_fetch(tdb, key);
+	if (!data.dptr || data.dsize != sizeof(uint32_t)) {
+		SAFE_FREE(data.dptr);
+		return false;
+	}
+
+	*value = IVAL(data.dptr,0);
+	SAFE_FREE(data.dptr);
+	return true;
+}
+
+/****************************************************************************
+ Fetch a uint32_t value by string key, return -1 if not found.
+ Output is uint32_t in native byte order.
+****************************************************************************/
+
+bool tdb_fetch_uint32(struct tdb_context *tdb, const char *keystr, uint32_t *value)
+{
+	return tdb_fetch_uint32_byblob(tdb, string_term_tdb_data(keystr), value);
+}
+
+/****************************************************************************
+ Store a uint32_t value by an arbitary blob key, return 0 on success, -1 on failure.
+ Input is uint32_t in native byte order. Output in tdb is in little-endian.
+****************************************************************************/
+
+bool tdb_store_uint32_byblob(struct tdb_context *tdb, TDB_DATA key, uint32_t value)
+{
+	TDB_DATA data;
+	uint32_t v_store;
+	bool ret = true;
+
+	SIVAL(&v_store, 0, value);
+	data.dptr = (unsigned char *)&v_store;
+	data.dsize = sizeof(uint32_t);
+
+	if (tdb_store(tdb, key, data, TDB_REPLACE) == -1)
+		ret = false;
+
+	return ret;
+}
+
+/****************************************************************************
+ Store a uint32_t value by string key, return 0 on success, -1 on failure.
+ Input is uint32_t in native byte order. Output in tdb is in little-endian.
+****************************************************************************/
+
+bool tdb_store_uint32(struct tdb_context *tdb, const char *keystr, uint32_t value)
+{
+	return tdb_store_uint32_byblob(tdb, string_term_tdb_data(keystr), value);
+}
+/****************************************************************************
+ Store a buffer by a null terminated string key.  Return 0 on success, -1
+ on failure.
+****************************************************************************/
+
+int tdb_store_bystring(struct tdb_context *tdb, const char *keystr, TDB_DATA data, int flags)
+{
+	TDB_DATA key = string_term_tdb_data(keystr);
+	
+	return tdb_store(tdb, key, data, flags);
+}
+
+/****************************************************************************
+ Fetch a buffer using a null terminated string key.  Don't forget to call
+ free() on the result dptr.
+****************************************************************************/
+
+TDB_DATA tdb_fetch_bystring(struct tdb_context *tdb, const char *keystr)
+{
+	TDB_DATA key = string_term_tdb_data(keystr);
+
+	return tdb_fetch(tdb, key);
+}
+
+/****************************************************************************
+ Delete an entry using a null terminated string key. 
+****************************************************************************/
+
+int tdb_delete_bystring(struct tdb_context *tdb, const char *keystr)
+{
+	TDB_DATA key = string_term_tdb_data(keystr);
+
+	return tdb_delete(tdb, key);
+}
+
+/****************************************************************************
+ Atomic integer change. Returns old value. To create, set initial value in *oldval. 
+****************************************************************************/
+
+int32_t tdb_change_int32_atomic(struct tdb_context *tdb, const char *keystr, int32_t *oldval, int32_t change_val)
+{
+	int32_t val;
+	int32_t ret = -1;
+
+	if (tdb_lock_bystring(tdb, keystr) == -1)
+		return -1;
+
+	if ((val = tdb_fetch_int32(tdb, keystr)) == -1) {
+		/* The lookup failed */
+		if (tdb_error(tdb) != TDB_ERR_NOEXIST) {
+			/* but not because it didn't exist */
+			goto err_out;
+		}
+		
+		/* Start with 'old' value */
+		val = *oldval;
+
+	} else {
+		/* It worked, set return value (oldval) to tdb data */
+		*oldval = val;
+	}
+
+	/* Increment value for storage and return next time */
+	val += change_val;
+		
+	if (tdb_store_int32(tdb, keystr, val) == -1)
+		goto err_out;
+
+	ret = 0;
+
+  err_out:
+
+	tdb_unlock_bystring(tdb, keystr);
+	return ret;
+}
+
+/****************************************************************************
+ Atomic unsigned integer change. Returns old value. To create, set initial value in *oldval. 
+****************************************************************************/
+
+bool tdb_change_uint32_atomic(struct tdb_context *tdb, const char *keystr, uint32_t *oldval, uint32_t change_val)
+{
+	uint32_t val;
+	bool ret = false;
+
+	if (tdb_lock_bystring(tdb, keystr) == -1)
+		return false;
+
+	if (!tdb_fetch_uint32(tdb, keystr, &val)) {
+		/* It failed */
+		if (tdb_error(tdb) != TDB_ERR_NOEXIST) { 
+			/* and not because it didn't exist */
+			goto err_out;
+		}
+
+		/* Start with 'old' value */
+		val = *oldval;
+
+	} else {
+		/* it worked, set return value (oldval) to tdb data */
+		*oldval = val;
+
+	}
+
+	/* get a new value to store */
+	val += change_val;
+		
+	if (!tdb_store_uint32(tdb, keystr, val))
+		goto err_out;
+
+	ret = true;
+
+  err_out:
+
+	tdb_unlock_bystring(tdb, keystr);
+	return ret;
+}
+
+/****************************************************************************
+ Allow tdb_delete to be used as a tdb_traversal_fn.
+****************************************************************************/
+
+int tdb_traverse_delete_fn(struct tdb_context *the_tdb, TDB_DATA key, TDB_DATA dbuf,
+                     void *state)
+{
+    return tdb_delete(the_tdb, key);
+}