/*
 *  ConfigDSN.c
 *
 *  $Id$
 *
 *  The iODBC driver manager.
 *
 *  Copyright (C) 1996-2021 OpenLink Software <iodbc@openlinksw.com>
 *  All Rights Reserved.
 *
 *  This software is released under the terms of either of the following
 *  licenses:
 *
 *      - GNU Library General Public License (see LICENSE.LGPL)
 *      - The BSD License (see LICENSE.BSD).
 *
 *  Note that the only valid version of the LGPL license as far as this
 *  project is concerned is the original GNU Library General Public License
 *  Version 2, dated June 1991.
 *
 *  While not mandated by the BSD license, any patches you make to the
 *  iODBC source code may be contributed back into the iODBC project
 *  at your discretion. Contributions will benefit the Open Source and
 *  Data Access community as a whole. Submissions may be made at:
 *
 *      http://www.iodbc.org
 *
 *
 *  GNU Library Generic Public License Version 2
 *  ============================================
 *  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; only
 *  Version 2 of the License dated June 1991.
 *
 *  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, write to the Free
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *
 *  The BSD License
 *  ===============
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *  3. Neither the name of OpenLink Software Inc. nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL OPENLINK OR
 *  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 *  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 *  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


/* ----------- Finished and tested with shadowing ----------- */

#include <iodbc.h>
#include <odbcinst.h>
#include <iodbc_error.h>
#include <iodbcadm.h>

#include "gui.h"

BOOL INSTAPI
ConfigDSN (
    HWND	  hwndParent,
    WORD	  fRequest,
    LPCSTR	  lpszDriver,
    LPCSTR	  lpszAttributes)
{
  char *dsn = NULL, *connstr = NULL, *curr, *cour = NULL;
  char dsnread[4096] = { 0 };
  char prov[4096] = { 0 };
  int driver_type = -1, flags = 0;
  BOOL retcode = FALSE;
  UWORD confMode = ODBC_USER_DSN;

  /* Map the request User/System */
  if (fRequest < ODBC_ADD_DSN || fRequest > ODBC_REMOVE_DSN)
    {
      SQLPostInstallerError (ODBC_ERROR_INVALID_REQUEST_TYPE, NULL);
      goto done;
    }

  if (!lpszDriver || !STRLEN (lpszDriver))
    {
      SQLPostInstallerError (ODBC_ERROR_INVALID_NAME, NULL);
      goto done;
    }

  /* Retrieve the config mode */
  SQLGetConfigMode (&confMode);

  /* Retrieve the DSN if one exist */
  for (curr = (LPSTR) lpszAttributes; curr && *curr;
      curr += (STRLEN (curr) + 1))
    {
      if (!strncmp (curr, "DSN=", STRLEN ("DSN=")))
	{
	  dsn = curr + STRLEN ("DSN=");
	  break;
	}
    }

  /* Retrieve the corresponding driver */
#if !defined (__APPLE__)
  if (strstr (lpszDriver, "OpenLink") || strstr (lpszDriver, "Openlink")
      || strstr (lpszDriver, "oplodbc"))
    {
      driver_type = 0;

      for (curr = (LPSTR) lpszAttributes, cour = prov; curr && *curr;
	  curr += (STRLEN (curr) + 1), cour += (STRLEN (cour) + 1))
	{
	  if (!strncasecmp (curr, "Host=", STRLEN ("Host="))
	      && STRLEN (curr + STRLEN ("Host=")))
	    {
	      STRCPY (cour, curr);
	      flags |= 0x1;
	      continue;
	    }
	  if (!strncasecmp (curr, "ServerType=", STRLEN ("ServerType="))
	      && STRLEN (curr + STRLEN ("ServerType=")))
	    {
	      STRCPY (cour, curr);
	      flags |= 0x2;
	      continue;
	    }
	  STRCPY (cour, curr);
	}

      if (cour && !(flags & 1))
	{
	  STRCPY (cour, "Host=localhost\0");
	  cour += (STRLEN (cour) + 1);
	}

      if (cour && !(flags & 2))
	{
	  STRCPY (cour, "ServerType=Proxy\0");
	  cour += (STRLEN (cour) + 1);
	}

      if (cour)
	*cour = 0;
    }
  else if ((strstr (lpszDriver, "Virtuoso")
	  || strstr (lpszDriver, "virtodbc")))
    driver_type = 1;
#endif

  /* For each request */
  switch (fRequest)
    {
    case ODBC_ADD_DSN:
      /* Check if the DSN with this name already exists */

      SQLSetConfigMode (confMode);
#ifdef WIN32
      if (hwndParent && dsn
	  && SQLGetPrivateProfileString ("ODBC 32 bit Data Sources", dsn, "",
	      dsnread, sizeof (dsnread), NULL)
	  && !create_confirm (hwndParent, dsn,
	      "Are you sure you want to overwrite this DSN ?"))
#else
      if (hwndParent && dsn
	  && SQLGetPrivateProfileString ("ODBC Data Sources", dsn, "",
	      dsnread, sizeof (dsnread), NULL)
	  && !create_confirm (hwndParent, dsn,
	      "Are you sure you want to overwrite this DSN ?"))
#endif
	goto done;

      /* Call the right setup function */
      connstr =
	  create_gensetup (hwndParent, dsn,
	  STRLEN (prov) ? prov : lpszAttributes, TRUE);

      /* Check output parameters */
      if (!connstr)
	{
	  SQLPostInstallerError (ODBC_ERROR_OUT_OF_MEM, NULL);
	  goto done;
	}

      if (connstr == (LPSTR) - 1L)
	goto done;

      /* Add the DSN to the ODBC Data Sources */
      SQLSetConfigMode (confMode);
      if (!SQLWriteDSNToIni (dsn = connstr + STRLEN ("DSN="), lpszDriver))
	goto done;

      /* Add each keyword and values */
      for (curr = connstr; *curr; curr += (STRLEN (curr) + 1))
	{
	  if (strncmp (curr, "DSN=", STRLEN ("DSN=")))
	    {
	      STRCPY (dsnread, curr);
	      cour = strchr (dsnread, '=');
	      if (cour)
		*cour = 0;
	      SQLSetConfigMode (confMode);
	      if (!SQLWritePrivateProfileString (dsn, dsnread, (cour
			  && STRLEN (cour + 1)) ? cour + 1 : NULL, NULL))
		goto done;
	    }
	}

      break;

    case ODBC_CONFIG_DSN:

      if (!dsn || !STRLEN (dsn))
	{
	  SQLPostInstallerError (ODBC_ERROR_INVALID_KEYWORD_VALUE, NULL);
	  goto done;
	}

      /* Call the right setup function */
      connstr = create_gensetup (hwndParent, dsn,
	  STRLEN (prov) ? prov : lpszAttributes, FALSE);

      /* Check output parameters */
      if (!connstr)
	{
	  SQLPostInstallerError (ODBC_ERROR_OUT_OF_MEM, NULL);
	  goto done;
	}

      if (connstr == (LPSTR) - 1L)
	goto done;


      /* Remove the previous DSN */
      SQLSetConfigMode (confMode);
      if (!SQLRemoveDSNFromIni (dsn))
        goto done;

      /* Add the new DSN section */
      SQLSetConfigMode (confMode);
      if (!SQLWriteDSNToIni (dsn = connstr + STRLEN ("DSN="), lpszDriver))
        goto done;

      /* Add each keyword and values */
      for (curr = connstr; *curr; curr += (STRLEN (curr) + 1))
	{
	  if (strncmp (curr, "DSN=", STRLEN ("DSN=")))
	    {
	      STRCPY (dsnread, curr);
	      cour = strchr (dsnread, '=');
	      if (cour)
		*cour = 0;
	      SQLSetConfigMode (confMode);
	      if (!SQLWritePrivateProfileString (dsn, dsnread, (cour
			  && STRLEN (cour + 1)) ? cour + 1 : NULL, NULL))
		goto done;
	    }
	}

      break;

    case ODBC_REMOVE_DSN:
      if (!dsn || !STRLEN (dsn))
	{
	  SQLPostInstallerError (ODBC_ERROR_INVALID_KEYWORD_VALUE, NULL);
	  goto done;
	}

      /* Just remove the DSN */
      SQLSetConfigMode (confMode);
      if (!SQLRemoveDSNFromIni (dsn))
	goto done;
      break;
    };

quit:
  retcode = TRUE;

done:
  if (connstr && connstr != (LPSTR) - 1L && connstr != lpszAttributes
      && connstr != prov)
    free (connstr);

  return retcode;
}
