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| -rw-r--r-- | libmariadb/include/mysql/client_plugin.h | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/libmariadb/include/mysql/client_plugin.h b/libmariadb/include/mysql/client_plugin.h new file mode 100644 index 00000000..262fd4a0 --- /dev/null +++ b/libmariadb/include/mysql/client_plugin.h @@ -0,0 +1,258 @@ +/* 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_common.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 + + |