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/************************************************************************************
Copyright (C) 2014 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
*************************************************************************************/
#ifndef _WIN32
#define _GNU_SOURCE 1
#endif
#include <my_global.h>
#include <mysql.h>
#include <mysql/client_plugin.h>
#include <string.h>
#include <memory.h>
#ifndef WIN32
#include <dlfcn.h>
#endif
/* function prototypes */
extern char *get_tty_password(char *opt_message, char *buff, int bufflen);
static int auth_dialog_open(MYSQL_PLUGIN_VIO *vio, MYSQL *mysql);
static int auth_dialog_init(char *unused1,
size_t unused2,
int unused3,
va_list);
mysql_authentication_dialog_ask_t auth_dialog_func;
mysql_declare_client_plugin(AUTHENTICATION)
"dialog",
"Sergei Golubchik, Georg Richter",
"Dialog Client Authentication Plugin",
{0,1,0},
"LGPL",
NULL,
auth_dialog_init,
NULL,
NULL,
auth_dialog_open
mysql_end_client_plugin;
/* {{{ static char *auth_dialog_native_prompt */
/*
Native dialog prompt via stdin
SYNOPSIS
auth_dialog_native_prompt
mysql connection handle
type input type
prompt prompt
buffer Input buffer
buffer_len Input buffer length
DESCRIPTION
RETURNS
Input buffer
*/
static char *auth_dialog_native_prompt(MYSQL *mysql,
int type,
const char *prompt,
char *buffer,
int buffer_len)
{
/* display prompt */
fprintf(stdout, "%s", prompt);
memset(buffer, 0, buffer_len);
/* for type 2 (password) don't display input */
if (type != 2)
{
if (fgets(buffer, buffer_len - 1, stdin))
{
/* remove trailing line break */
size_t length= strlen(buffer);
if (length && buffer[length - 1] == '\n')
buffer[length - 1]= 0;
}
}
else
{
get_tty_password("", buffer, buffer_len - 1);
}
return buffer;
}
/* }}} */
/* {{{ static int auth_dialog_open */
/*
opens dialog
SYNOPSIS
vio Vio
mysql connection handle
DESCRIPTION
reads prompt from server, waits for input and sends
input to server.
Note that first byte of prompt indicates if we have a
password which should not be echoed to stdout.
RETURN
CR_ERROR if an error occurs
CR_OK
CR_OK_HANDSHAKE_COMPLETE
*/
static int auth_dialog_open(MYSQL_PLUGIN_VIO *vio, MYSQL *mysql)
{
uchar *packet;
uchar type;
char dialog_buffer[1024];
char *response;
int packet_length;
my_bool first_loop= TRUE;
do {
if ((packet_length= vio->read_packet(vio, &packet)) < 0)
/* read error */
return CR_ERROR;
if (packet_length > 0)
{
type= *packet;
packet++;
/* check for protocol packet */
if (!type || type == 254)
return CR_OK_HANDSHAKE_COMPLETE;
if ((type >> 1) == 2 &&
first_loop &&
mysql->passwd && mysql->passwd[0])
response= mysql->passwd;
else
response= auth_dialog_func(mysql, type >> 1,
(const char *)packet,
dialog_buffer, 1024);
}
else
{
/* in case mysql_change_user was called the client needs
to send packet first */
response= mysql->passwd;
}
if (!response ||
vio->write_packet(vio, response, strlen(response) + 1))
return CR_ERROR;
first_loop= FALSE;
} while((type & 1) != 1);
return CR_OK;
}
/* }}} */
/* {{{ static int auth_dialog_init */
/*
Initialization routine
SYNOPSIS
auth_dialog_init
unused1
unused2
unused3
unused4
DESCRIPTION
Init function checks if the caller provides own dialog function.
The function name must be mariadb_auth_dialog or
mysql_authentication_dialog_ask. If the function cannot be found,
we will use owr own simple command line input.
RETURN
0 success
*/
static int auth_dialog_init(char *unused1 __attribute__((unused)),
size_t unused2 __attribute__((unused)),
int unused3 __attribute__((unused)),
va_list unused4 __attribute__((unused)))
{
void *func;
#ifdef WIN32
if (!(func= GetProcAddress(GetModuleHandle(NULL), "mariadb_auth_dialog")))
/* for MySQL users */
func= GetProcAddress(GetModuleHandle(NULL), "mysql_authentication_dialog_ask");
#else
if (!(func= dlsym(RTLD_DEFAULT, "mariadb_auth_dialog")))
/* for MySQL users */
func= dlsym(RTLD_DEFAULT, "mysql_authentication_dialog_ask");
#endif
if (func)
auth_dialog_func= (mysql_authentication_dialog_ask_t)func;
else
auth_dialog_func= auth_dialog_native_prompt;
return 0;
}
/* }}} */
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