1 files changed, 525 insertions, 0 deletions
diff --git a/lib/util/util_tdb.c b/lib/util/util_tdb.c
new file mode 100644
index 0000000..d8672c3
--- /dev/null
+++ b/lib/util/util_tdb.c
@@ -0,0 +1,525 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   tdb utility functions
+
+   Copyright (C) Andrew Tridgell 1992-2006
+   Copyright (C) Volker Lendecke 2007-2011
+
+   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 "replace.h"
+#include <talloc.h>
+#include "libcli/util/ntstatus.h"
+#include "lib/util/memory.h"
+#include "lib/util/byteorder.h"
+#include "system/filesys.h"
+#include "../lib/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;
+}
+
+bool tdb_data_equal(TDB_DATA t1, TDB_DATA t2)
+{
+	if (t1.dsize != t2.dsize) {
+		return false;
+	}
+	return (memcmp(t1.dptr, t2.dptr, t1.dsize) == 0);
+}
+
+bool tdb_data_is_empty(TDB_DATA d)
+{
+	return (d.dsize == 0) || (d.dptr == NULL);
+}
+
+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);
+}
+
+TDB_DATA tdb_data_talloc_copy(TALLOC_CTX* mem_ctx, TDB_DATA data) {
+	TDB_DATA ret = {
+		.dptr  = (uint8_t *)talloc_size(mem_ctx, data.dsize+1),
+		.dsize = data.dsize
+	};
+	if (ret.dptr == NULL) {
+		ret.dsize = 0;
+	} else {
+		memcpy(ret.dptr, data.dptr, data.dsize);
+		ret.dptr[ret.dsize] = '\0';
+	}
+	return ret;
+}
+
+
+/****************************************************************************
+ Lock a chain by string. Return non-zero 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 non-zero 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.
+****************************************************************************/
+
+static int fetch_int32_parser(TDB_DATA key, TDB_DATA data, void *private_data)
+{
+	if (data.dsize == sizeof(int32_t)) {
+		*((int32_t *)private_data) = PULL_LE_I32(data.dptr, 0);
+	}
+	return 0;
+}
+
+static int32_t tdb_fetch_int32_byblob(struct tdb_context *tdb, TDB_DATA key)
+{
+	int32_t v = -1;
+	int32_t ret = tdb_parse_record(tdb, key, fetch_int32_parser, &v);
+	if (ret == -1) {
+		return ret;
+	}
+	return v;
+}
+
+/****************************************************************************
+ 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 arbitrary blob key, return 0 on success, -ve on failure.
+ Input is int32_t in native byte order. Output in tdb is in little-endian.
+****************************************************************************/
+
+static 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, -ve 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 false if not found.
+ Output is uint32_t in native byte order.
+****************************************************************************/
+
+static int fetch_uint32_parser(TDB_DATA key, TDB_DATA data, void *private_data)
+{
+	if (data.dsize != sizeof(uint32_t)) {
+		return -1;
+	}
+	*((uint32_t *)private_data) = PULL_LE_U32(data.dptr, 0);
+	return 0;
+}
+
+static bool tdb_fetch_uint32_byblob(struct tdb_context *tdb, TDB_DATA key,
+				    uint32_t *value)
+{
+	int ret = tdb_parse_record(tdb, key, fetch_uint32_parser, value);
+
+	if (ret == -1) {
+		return false;
+	}
+
+	return true;
+}
+
+/****************************************************************************
+ Fetch a uint32_t value by string key, return false 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 arbitrary blob key, return true on success, false on failure.
+ Input is uint32_t in native byte order. Output in tdb is in little-endian.
+****************************************************************************/
+
+static 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) != 0)
+		ret = false;
+
+	return ret;
+}
+
+/****************************************************************************
+ Store a uint32_t value by string key, return true on success, false 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, -ve
+ 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) != 0)
+		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) != 0)
+		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) != 0)
+		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;
+}
+
+/****************************************************************************
+ Return an NTSTATUS from a TDB_ERROR
+****************************************************************************/
+
+NTSTATUS map_nt_error_from_tdb(enum TDB_ERROR err)
+{
+	NTSTATUS result;
+
+	switch (err) {
+	case TDB_SUCCESS:
+		result = NT_STATUS_OK;
+		break;
+	case TDB_ERR_CORRUPT:
+		result = NT_STATUS_INTERNAL_DB_CORRUPTION;
+		break;
+	case TDB_ERR_IO:
+		result = NT_STATUS_UNEXPECTED_IO_ERROR;
+		break;
+	case TDB_ERR_OOM:
+		result = NT_STATUS_NO_MEMORY;
+		break;
+	case TDB_ERR_EXISTS:
+		result = NT_STATUS_OBJECT_NAME_COLLISION;
+		break;
+
+	case TDB_ERR_LOCK:
+		/*
+		 * TDB_ERR_LOCK is very broad, we could for example
+		 * distinguish between fcntl locks and invalid lock
+		 * sequences. So NT_STATUS_FILE_LOCK_CONFLICT is a
+		 * compromise.
+		 */
+		result = NT_STATUS_FILE_LOCK_CONFLICT;
+		break;
+
+	case TDB_ERR_NOLOCK:
+	case TDB_ERR_LOCK_TIMEOUT:
+		/*
+		 * These two ones in the enum are not actually used
+		 */
+		result = NT_STATUS_FILE_LOCK_CONFLICT;
+		break;
+	case TDB_ERR_NOEXIST:
+		result = NT_STATUS_NOT_FOUND;
+		break;
+	case TDB_ERR_EINVAL:
+		result = NT_STATUS_INVALID_PARAMETER;
+		break;
+	case TDB_ERR_RDONLY:
+		result = NT_STATUS_ACCESS_DENIED;
+		break;
+	case TDB_ERR_NESTING:
+		result = NT_STATUS_INTERNAL_ERROR;
+		break;
+	default:
+		result = NT_STATUS_INTERNAL_ERROR;
+		break;
+	};
+	return result;
+}
+
+int map_unix_error_from_tdb(enum TDB_ERROR err)
+{
+	int result = EINVAL;
+
+	switch (err) {
+	case TDB_SUCCESS:
+		result = 0;
+		break;
+	case TDB_ERR_CORRUPT:
+		result = EILSEQ;
+		break;
+	case TDB_ERR_IO:
+		result = EIO;
+		break;
+	case TDB_ERR_OOM:
+		result = ENOMEM;
+		break;
+	case TDB_ERR_EXISTS:
+		result = EEXIST;
+		break;
+
+	case TDB_ERR_LOCK:
+		/*
+		 * TDB_ERR_LOCK is very broad, we could for example
+		 * distinguish between fcntl locks and invalid lock
+		 * sequences. EWOULDBLOCK is wrong, but there is no real
+		 * generic lock error code in errno.h
+		 */
+		result = EWOULDBLOCK;
+		break;
+
+	case TDB_ERR_NOLOCK:
+	case TDB_ERR_LOCK_TIMEOUT:
+		/*
+		 * These two ones in the enum are not actually used
+		 */
+		result = ENOLCK;
+		break;
+	case TDB_ERR_NOEXIST:
+		result = ENOENT;
+		break;
+	case TDB_ERR_EINVAL:
+		result = EINVAL;
+		break;
+	case TDB_ERR_RDONLY:
+		result = EROFS;
+		break;
+	case TDB_ERR_NESTING:
+		/*
+		 * Well, this db is already busy...
+		 */
+		result = EBUSY;
+		break;
+	};
+	return result;
+}
+
+struct tdb_fetch_talloc_state {
+	TALLOC_CTX *mem_ctx;
+	uint8_t *buf;
+};
+
+static int tdb_fetch_talloc_parser(TDB_DATA key, TDB_DATA data,
+                                   void *private_data)
+{
+	struct tdb_fetch_talloc_state *state = private_data;
+	state->buf = talloc_memdup(state->mem_ctx, data.dptr, data.dsize);
+	return 0;
+}
+
+int tdb_fetch_talloc(struct tdb_context *tdb, TDB_DATA key,
+		     TALLOC_CTX *mem_ctx, uint8_t **buf)
+{
+	struct tdb_fetch_talloc_state state = { .mem_ctx = mem_ctx };
+	int ret;
+
+	ret = tdb_parse_record(tdb, key, tdb_fetch_talloc_parser, &state);
+	if (ret == -1) {
+		enum TDB_ERROR err = tdb_error(tdb);
+		return map_unix_error_from_tdb(err);
+	}
+
+	if (state.buf == NULL) {
+		return ENOMEM;
+	}
+
+	*buf = state.buf;
+	return 0;
+}