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| Current File : //usr/include/mysql/mysql/client_plugin.h |
#ifndef MYSQL_CLIENT_PLUGIN_INCLUDED
/* Copyright (c) 2010, 2016, 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 as published by
the Free Software Foundation; version 2 of the License.
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, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/**
@file
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 0x0100
#define MYSQL_CLIENT_TRACE_PLUGIN_INTERFACE_VERSION 0x0100
#define MYSQL_CLIENT_MAX_PLUGINS 4
#define mysql_declare_client_plugin(X) \
MYSQL_PLUGIN_EXPORT struct 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 st_mysql;
/******** authentication plugin specific declarations *********/
#include "plugin_auth_common.h"
struct st_mysql_client_plugin_AUTHENTICATION
{
MYSQL_CLIENT_PLUGIN_HEADER
int (*authenticate_user)(MYSQL_PLUGIN_VIO *vio, struct st_mysql *mysql);
};
/******** 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 st_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 st_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 st_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 st_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