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diff --git a/contrib/libs/libmysql_r/include/mysql/client_plugin.h b/contrib/libs/libmysql_r/include/mysql/client_plugin.h
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+++ b/contrib/libs/libmysql_r/include/mysql/client_plugin.h
@@ -0,0 +1,213 @@
+#ifndef MYSQL_CLIENT_PLUGIN_INCLUDED
+/* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License, version 2.0,
+   as published by the Free Software Foundation.
+
+   This program is also distributed with certain software (including
+   but not limited to OpenSSL) that is licensed under separate terms,
+   as designated in a particular file or component or in included license
+   documentation.  The authors of MySQL hereby grant you an additional
+   permission to link the program and your derivative works with the
+   separately licensed software that they have included with MySQL.
+
+   Without limiting anything contained in the foregoing, this file,
+   which is part of C Driver for MySQL (Connector/C), is also subject to the
+   Universal FOSS Exception, version 1.0, a copy of which can be found at
+   http://oss.oracle.com/licenses/universal-foss-exception.
+
+   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, version 2.0, for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
+
+/**
+  @file include/mysql/client_plugin.h
+  MySQL Client Plugin API.
+  This file defines the API for plugins that work on the client side
+*/
+#define MYSQL_CLIENT_PLUGIN_INCLUDED
+
+#ifndef MYSQL_ABI_CHECK
+#include <stdarg.h>
+#include <stdlib.h>
+#endif
+
+/*
+  On Windows, exports from DLL need to be declared.
+  Also, plugin needs to be declared as extern "C" because MSVC
+  unlike other compilers, uses C++ mangling for variables not only
+  for functions.
+*/
+
+#undef MYSQL_PLUGIN_EXPORT
+
+#if defined(_MSC_VER)
+#if defined(MYSQL_DYNAMIC_PLUGIN)
+#ifdef __cplusplus
+#define MYSQL_PLUGIN_EXPORT extern "C" __declspec(dllexport)
+#else
+#define MYSQL_PLUGIN_EXPORT __declspec(dllexport)
+#endif
+#else /* MYSQL_DYNAMIC_PLUGIN */
+#ifdef __cplusplus
+#define MYSQL_PLUGIN_EXPORT extern "C"
+#else
+#define MYSQL_PLUGIN_EXPORT
+#endif
+#endif /*MYSQL_DYNAMIC_PLUGIN */
+#else  /*_MSC_VER */
+#define MYSQL_PLUGIN_EXPORT
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* known plugin types */
+#define MYSQL_CLIENT_reserved1 0
+#define MYSQL_CLIENT_reserved2 1
+#define MYSQL_CLIENT_AUTHENTICATION_PLUGIN 2
+#define MYSQL_CLIENT_TRACE_PLUGIN 3
+
+#define MYSQL_CLIENT_AUTHENTICATION_PLUGIN_INTERFACE_VERSION 0x0101
+#define MYSQL_CLIENT_TRACE_PLUGIN_INTERFACE_VERSION 0x0100
+
+#define MYSQL_CLIENT_MAX_PLUGINS 4
+
+#define mysql_declare_client_plugin(X)           \
+  MYSQL_PLUGIN_EXPORT st_mysql_client_plugin_##X \
+      _mysql_client_plugin_declaration_ = {      \
+          MYSQL_CLIENT_##X##_PLUGIN,             \
+          MYSQL_CLIENT_##X##_PLUGIN_INTERFACE_VERSION,
+#define mysql_end_client_plugin }
+
+/* generic plugin header structure */
+#define MYSQL_CLIENT_PLUGIN_HEADER           \
+  int type;                                  \
+  unsigned int interface_version;            \
+  const char *name;                          \
+  const char *author;                        \
+  const char *desc;                          \
+  unsigned int version[3];                   \
+  const char *license;                       \
+  void *mysql_api;                           \
+  int (*init)(char *, size_t, int, va_list); \
+  int (*deinit)(void);                       \
+  int (*options)(const char *option, const void *);
+
+struct st_mysql_client_plugin {
+  MYSQL_CLIENT_PLUGIN_HEADER
+};
+
+struct MYSQL;
+
+/******** authentication plugin specific declarations *********/
+#include "plugin_auth_common.h"
+
+struct auth_plugin_t {
+  MYSQL_CLIENT_PLUGIN_HEADER
+  int (*authenticate_user)(MYSQL_PLUGIN_VIO *vio, struct MYSQL *mysql);
+  enum net_async_status (*authenticate_user_nonblocking)(MYSQL_PLUGIN_VIO *vio,
+                                                         struct MYSQL *mysql,
+                                                         int *result);
+};
+
+// Needed for the mysql_declare_client_plugin() macro. Do not use elsewhere.
+typedef struct auth_plugin_t st_mysql_client_plugin_AUTHENTICATION;
+
+/******** using plugins ************/
+
+/**
+  loads a plugin and initializes it
+
+  @param mysql  MYSQL structure.
+  @param name   a name of the plugin to load
+  @param type   type of plugin that should be loaded, -1 to disable type check
+  @param argc   number of arguments to pass to the plugin initialization
+                function
+  @param ...    arguments for the plugin initialization function
+
+  @retval
+  a pointer to the loaded plugin, or NULL in case of a failure
+*/
+struct st_mysql_client_plugin *mysql_load_plugin(struct MYSQL *mysql,
+                                                 const char *name, int type,
+                                                 int argc, ...);
+
+/**
+  loads a plugin and initializes it, taking va_list as an argument
+
+  This is the same as mysql_load_plugin, but take va_list instead of
+  a list of arguments.
+
+  @param mysql  MYSQL structure.
+  @param name   a name of the plugin to load
+  @param type   type of plugin that should be loaded, -1 to disable type check
+  @param argc   number of arguments to pass to the plugin initialization
+                function
+  @param args   arguments for the plugin initialization function
+
+  @retval
+  a pointer to the loaded plugin, or NULL in case of a failure
+*/
+struct st_mysql_client_plugin *mysql_load_plugin_v(struct MYSQL *mysql,
+                                                   const char *name, int type,
+                                                   int argc, va_list args);
+
+/**
+  finds an already loaded plugin by name, or loads it, if necessary
+
+  @param mysql  MYSQL structure.
+  @param name   a name of the plugin to load
+  @param type   type of plugin that should be loaded
+
+  @retval
+  a pointer to the plugin, or NULL in case of a failure
+*/
+struct st_mysql_client_plugin *mysql_client_find_plugin(struct MYSQL *mysql,
+                                                        const char *name,
+                                                        int type);
+
+/**
+  adds a plugin structure to the list of loaded plugins
+
+  This is useful if an application has the necessary functionality
+  (for example, a special load data handler) statically linked into
+  the application binary. It can use this function to register the plugin
+  directly, avoiding the need to factor it out into a shared object.
+
+  @param mysql  MYSQL structure. It is only used for error reporting
+  @param plugin an st_mysql_client_plugin structure to register
+
+  @retval
+  a pointer to the plugin, or NULL in case of a failure
+*/
+struct st_mysql_client_plugin *mysql_client_register_plugin(
+    struct MYSQL *mysql, struct st_mysql_client_plugin *plugin);
+
+/**
+  set plugin options
+
+  Can be used to set extra options and affect behavior for a plugin.
+  This function may be called multiple times to set several options
+
+  @param plugin an st_mysql_client_plugin structure
+  @param option a string which specifies the option to set
+  @param value  value for the option.
+
+  @retval 0 on success, 1 in case of failure
+**/
+int mysql_plugin_options(struct st_mysql_client_plugin *plugin,
+                         const char *option, const void *value);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif