Current File : //usr/include/mysql/mysql/client_plugin.h
/* Copyright (C) 2010 - 2012 Sergei Golubchik and Monty Program Ab
2014, 2022 MariaDB Corporation AB
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not see <http://www.gnu.org/licenses>
or write to the Free Software Foundation, Inc.,
51 Franklin St., Fifth Floor, Boston, MA 02110, USA */
/**
@file
MySQL Client Plugin API
This file defines the API for plugins that work on the client side
*/
#ifndef MYSQL_CLIENT_PLUGIN_INCLUDED
#define MYSQL_CLIENT_PLUGIN_INCLUDED
#ifndef MYSQL_ABI_CHECK
#include <stdarg.h>
#include <stdlib.h>
#endif
#ifndef PLUGINDIR
#define PLUGINDIR "lib/plugin"
#endif
#define plugin_declarations_sym "_mysql_client_plugin_declaration_"
/* known plugin types */
#define MYSQL_CLIENT_PLUGIN_RESERVED 0
#define MYSQL_CLIENT_PLUGIN_RESERVED2 1
#define MYSQL_CLIENT_AUTHENTICATION_PLUGIN 2 /* authentication */
#define MYSQL_CLIENT_AUTHENTICATION_PLUGIN_INTERFACE_VERSION 0x0100
#define MYSQL_CLIENT_MAX_PLUGINS 3
/* Connector/C specific plugin types */
#define MARIADB_CLIENT_REMOTEIO_PLUGIN 100 /* communication IO */
#define MARIADB_CLIENT_PVIO_PLUGIN 101
#define MARIADB_CLIENT_TRACE_PLUGIN 102
#define MARIADB_CLIENT_CONNECTION_PLUGIN 103
#define MARIADB_CLIENT_COMPRESSION_PLUGIN 104
#define MARIADB_CLIENT_REMOTEIO_PLUGIN_INTERFACE_VERSION 0x0100
#define MARIADB_CLIENT_PVIO_PLUGIN_INTERFACE_VERSION 0x0100
#define MARIADB_CLIENT_TRACE_PLUGIN_INTERFACE_VERSION 0x0100
#define MARIADB_CLIENT_CONNECTION_PLUGIN_INTERFACE_VERSION 0x0100
#define MARIADB_CLIENT_COMPRESSION_PLUGIN_INTERFACE_VERSION 0x0100
#define MARIADB_CLIENT_MAX_PLUGINS 5
#define mysql_declare_client_plugin(X) \
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 */
#ifndef MYSQL_CLIENT_PLUGIN_HEADER
#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
};
#endif
struct st_mysql;
/********* connection handler plugin specific declarations **********/
typedef struct st_ma_connection_plugin
{
MYSQL_CLIENT_PLUGIN_HEADER
/* functions */
MYSQL *(*connect)(MYSQL *mysql, const char *host,
const char *user, const char *passwd,
const char *db, unsigned int port,
const char *unix_socket, unsigned long clientflag);
void (*close)(MYSQL *mysql);
int (*set_optionsv)(MYSQL *mysql, unsigned int option, ...);
int (*set_connection)(MYSQL *mysql,enum enum_server_command command,
const char *arg,
size_t length, my_bool skipp_check, void *opt_arg);
my_bool (*reconnect)(MYSQL *mysql);
int (*reset)(MYSQL *mysql);
} MARIADB_CONNECTION_PLUGIN;
#define MARIADB_DB_DRIVER(a) ((a)->ext_db)
/******************* Communication IO plugin *****************/
#include <ma_pvio.h>
typedef struct st_mariadb_client_plugin_PVIO
{
MYSQL_CLIENT_PLUGIN_HEADER
struct st_ma_pvio_methods *methods;
} MARIADB_PVIO_PLUGIN;
/******** authentication plugin specific declarations *********/
#include <mysql/plugin_auth.h>
struct st_mysql_client_plugin_AUTHENTICATION
{
MYSQL_CLIENT_PLUGIN_HEADER
int (*authenticate_user)(MYSQL_PLUGIN_VIO *vio, struct st_mysql *mysql);
};
/******** trace plugin *******/
struct st_mysql_client_plugin_TRACE
{
MYSQL_CLIENT_PLUGIN_HEADER
};
#include <ma_compress.h>
typedef struct st_mariadb_client_plugin_COMPRESS
{
MYSQL_CLIENT_PLUGIN_HEADER
ma_compress_ctx *(*init_ctx)(int compression_level);
void (*free_ctx)(ma_compress_ctx *ctx);
my_bool (*compress)(ma_compress_ctx *ctx, void *dst, size_t *dst_len, void *source, size_t source_len);
my_bool (*decompress)(ma_compress_ctx *ctx, void *dst, size_t *dst_len, void *source, size_t *source_len);
} MARIADB_COMPRESSION_PLUGIN;
/**
type of the mysql_authentication_dialog_ask function
@param mysql mysql
@param type type of the input
1 - ordinary string input
2 - password string
@param prompt prompt
@param buf a buffer to store the use input
@param buf_len the length of the buffer
@retval a pointer to the user input string.
It may be equal to 'buf' or to 'mysql->password'.
In all other cases it is assumed to be an allocated
string, and the "dialog" plugin will free() it.
*/
typedef char *(*mysql_authentication_dialog_ask_t)(struct st_mysql *mysql,
int type, const char *prompt, char *buf, int buf_len);
/********************** remote IO plugin **********************/
#ifdef HAVE_REMOTEIO
#include <mariadb/ma_io.h>
/* Remote IO plugin */
typedef struct st_mysql_client_plugin_REMOTEIO
{
MYSQL_CLIENT_PLUGIN_HEADER
struct st_rio_methods *methods;
} MARIADB_REMOTEIO_PLUGIN;
#endif
/******** using plugins ************/
/**
loads a plugin and initializes it
@param mysql MYSQL structure. only MYSQL_PLUGIN_DIR option value is used,
and last_errno/last_error, for error reporting
@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. only MYSQL_PLUGIN_DIR option value is used,
and last_errno/last_error, for error reporting
@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 * STDCALL
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. only MYSQL_PLUGIN_DIR option value is used,
and last_errno/last_error, for error reporting
@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 * STDCALL
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 * STDCALL
mysql_client_register_plugin(struct st_mysql *mysql,
struct st_mysql_client_plugin *plugin);
extern struct st_mysql_client_plugin *mysql_client_builtins[];
#endif