qa_auth_client.c

/*  Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
    
    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 St, Fifth Floor, Boston, MA 02110-1301 USA */

#include <my_global.h>
#include <mysql/plugin_auth.h>
#include <mysql/client_plugin.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>

#define ORDINARY_QUESTION       "\2"
#define LAST_QUESTION           "\3"
#define LAST_PASSWORD           "\4"
#define PASSWORD_QUESTION       "\5"

/********************* CLIENT SIDE ***************************************/
/*
  client plugin used for testing the plugin API
*/
#include <mysql.h>

static int test_plugin_client(MYSQL_PLUGIN_VIO *vio, MYSQL *mysql)
{
  unsigned char *pkt, cmd= 0;
  int pkt_len, res;
  char *reply;

  do
  {
    /* read the prompt */
    pkt_len= vio->read_packet(vio, &pkt);
    if (pkt_len < 0)
      return CR_ERROR;

    if (pkt == 0)
    {
      /*
        in mysql_change_user() the client sends the first packet, so
        the first vio->read_packet() does nothing (pkt == 0).

        We send the "password", assuming the client knows what its doing.
        (in other words, the dialog plugin should be only set as a default
        authentication plugin on the client if the first question
        asks for a password - which will be sent in cleat text, by the way)
      */
      reply= mysql->passwd;
    }
    else
    {
      cmd= *pkt++;

      /* is it MySQL protocol (0=OK or 254=need old password) packet ? */
      if (cmd == 0 || cmd == 254)
        return CR_OK_HANDSHAKE_COMPLETE; /* yes. we're done */

      /*
        asking for a password with an empty prompt means mysql->password
        otherwise return an error
      */
      if ((cmd == LAST_PASSWORD[0] || cmd == PASSWORD_QUESTION[0]) && *pkt == 0)
        reply= mysql->passwd;
      else
        return CR_ERROR;
    }
    if (!reply)
      return CR_ERROR;
    /* send the reply to the server */
    res= vio->write_packet(vio, (const unsigned char *) reply, 
                           strlen(reply) + 1);

    if (res)
      return CR_ERROR;

    /* repeat unless it was the last question */
  } while (cmd != LAST_QUESTION[0] && cmd != PASSWORD_QUESTION[0]);

  /* the job of reading the ok/error packet is left to the server */
  return CR_OK;
}


mysql_declare_client_plugin(AUTHENTICATION)
  "qa_auth_client",
  "Horst Hunger",
  "Dialog Client Authentication Plugin",
  {0,1,0},
  "GPL",
  NULL,
  NULL,
  NULL,
  NULL,
  test_plugin_client
mysql_end_client_plugin;