golden hour

/usr/include/mysql/server/mysql

File/Folder	Size	Actions
auth_dialog_client.h	2.01 KB
client_plugin.h	6.18 KB
plugin.h	28.69 KB
plugin_audit.h	5.41 KB
plugin_auth.h	5.27 KB
plugin_auth_common.h	4.4 KB
plugin_data_type.h	1.27 KB
plugin_encryption.h	4.33 KB
plugin_ftparser.h	7.65 KB
plugin_function.h	1.4 KB
plugin_password_validation.h	1.52 KB
psi	-
service_base64.h	2.86 KB
service_debug_sync.h	13.18 KB
service_encryption.h	5.52 KB
service_encryption_scheme.h	5.51 KB
service_json.h	4.44 KB
service_kill_statement.h	2.02 KB
service_logger.h	3.47 KB
service_md5.h	2.07 KB
service_my_crypt.h	4.07 KB
service_my_print_error.h	2.27 KB
service_my_snprintf.h	3.63 KB
service_print_check_msg.h	1.52 KB
service_progress_report.h	3.28 KB
service_sha1.h	2.11 KB
service_sha2.h	5.17 KB
service_sql.h	4.57 KB
service_thd_alloc.h	4.38 KB
service_thd_autoinc.h	1.65 KB
service_thd_error_context.h	3.34 KB
service_thd_mdl.h	1.25 KB
service_thd_rnd.h	1.86 KB
service_thd_specifics.h	3.6 KB
service_thd_timezone.h	2.24 KB
service_thd_wait.h	3.61 KB
service_wsrep.h	13.04 KB
services.h	1.72 KB

Edit: auth_dialog_client.h

#ifndef MYSQL_AUTH_DIALOG_CLIENT_INCLUDED
/* Copyright (C) 2010 Sergei Golubchik and Monty Program Ab

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 Street, Fifth Floor, Boston, MA 02110-1335 USA */

/**
  @file

Definitions needed to use Dialog client authentication plugin
*/

struct st_mysql;

#define MYSQL_AUTH_DIALOG_CLIENT_INCLUDED

/**
  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);

/**
  first byte of the question string is the question "type".
  It can be an "ordinary" or a "password" question.
  The last bit set marks a last question in the authentication exchange.
*/
#define ORDINARY_QUESTION       "\2"
#define LAST_QUESTION           "\3"
#define PASSWORD_QUESTION       "\4"
#define LAST_PASSWORD           "\5"

#endif