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mysql
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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
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