CASA/auth_token/krb5_token/linux/interface.c

/***********************************************************************
 * 
 *  Copyright (C) 2005-2006 Novell, Inc.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; version 2.1
 *  of the License.
 *
 *  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 Lesser General Public
 *  License along with this library; if not, write to the Free
 *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 * 
 *  To contact Novell about this file by physical or electronic mail, 
 *  you may find current contact information at www.novell.com.
 * 
 ***********************************************************************/

//===[ Include files ]=====================================================

#include "internal.h"

//===[ Type definitions ]==================================================

//
// Authentication Token Interface instance data
// 
typedef struct _AuthTokenIfInstance
{
   int            refCount;
   AuthTokenIf    authTokenIf;

} AuthTokenIfInstance, *PAuthTokenIfInstance;

//===[ Function prototypes ]===============================================

//===[ Global variables ]==================================================

// AuthTokenIf synchronization mutex and variables
static
pthread_mutex_t   g_authTokenIfMutex = PTHREAD_MUTEX_INITIALIZER;

static
int               g_numAuthTokenIfObjs = 0;



//++=======================================================================
int SSCS_CALL
Krb5AuthTokenIf_AddReference(
   IN       const void  *pIfInstance)
//
// Arguments:  
//    pIfInstance -
//       Pointer to interface object.
//   
// Returns:
//    Interface reference count.
//                           
// Description:
//    Increases interface reference count.
//
// L2
//=======================================================================--
{
   int                  refCount;
   AuthTokenIfInstance  *pAuthTokenIfInstance = CONTAINING_RECORD(pIfInstance, AuthTokenIfInstance, authTokenIf);

   DbgTrace(2, "krb5_token -Krb5AuthTokenIf_AddReference- Start\n", 0);

   // Increment the reference count on the object
   pthread_mutex_lock(&g_authTokenIfMutex);
   pAuthTokenIfInstance->refCount ++;
   refCount = pAuthTokenIfInstance->refCount;
   pthread_mutex_unlock(&g_authTokenIfMutex);

   DbgTrace(2, "krb5_token -Krb5AuthTokenIf_AddReference- End, refCount = %08X\n", refCount);

   return refCount;
}


//++=======================================================================
void SSCS_CALL
Krb5AuthTokenIf_ReleaseReference(
   IN       const void  *pIfInstance)
//
// Arguments:  
//    pIfInstance -
//       Pointer to interface object.
//   
// Returns:
//    Nothing.
//                           
// Description:
//    Decreases interface reference count. The interface is deallocated if
//    the reference count becomes zero.
//
// L2
//=======================================================================--
{
   bool                 freeObj = false;
   AuthTokenIfInstance  *pAuthTokenIfInstance = CONTAINING_RECORD(pIfInstance, AuthTokenIfInstance, authTokenIf);

   DbgTrace(2, "krb5_token -Krb5AuthTokenIf_ReleaseReference- Start\n", 0);

   // Decrement the reference count on the object and determine if it needs to
   // be released.
   pthread_mutex_lock(&g_authTokenIfMutex);
   pAuthTokenIfInstance->refCount --;
   if (pAuthTokenIfInstance->refCount == 0)
   {
      // The object needs to be released, forget about it.
      freeObj = true;
      g_numAuthTokenIfObjs --;
   }
   pthread_mutex_unlock(&g_authTokenIfMutex);

   // Free object if necessary
   if (freeObj)
      free(pAuthTokenIfInstance);

   DbgTrace(2, "krb5_token -Krb5AuthTokenIf_ReleaseReference- End\n", 0);
}


//++=======================================================================
CasaStatus SSCS_CALL
GET_AUTH_TOKEN_INTERFACE_RTN(
   IN       const ConfigIf    *pModuleConfigIf,
   INOUT    AuthTokenIf       **ppAuthTokenIf)
//
// Arguments:  
//    pModuleConfigIf -
//       Pointer to configuration interface instance for the module.
//               
//    ppAuthTokenIf -
//       Pointer to variable that will receive pointer to AuthTokenIf
//       instance.
//
// Returns:
//    Casa Status
//                           
// Description:
//    Gets authentication token interface instance.
//
// L2
//=======================================================================--
{
   CasaStatus           retStatus;
   AuthTokenIfInstance  *pAuthTokenIfInstance;


   DbgTrace(1, "krb5_token -GetAuthTokenInterface- Start\n", 0);

   // Validate input parameters
   if (pModuleConfigIf == NULL
       || ppAuthTokenIf == NULL)
   {
      DbgTrace(0, "krb5_token -GetAuthTokenInterface- Invalid input parameter\n", 0);

      retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
                                  CASA_FACILITY_KRB5TOKEN,
                                  CASA_STATUS_INVALID_PARAMETER);
      goto exit;
   }

   // Allocate space for the interface instance
   pAuthTokenIfInstance = malloc(sizeof(*pAuthTokenIfInstance));
   if (pAuthTokenIfInstance)
   {
      // Initialize the interface instance data
      pAuthTokenIfInstance->refCount = 1;
      pAuthTokenIfInstance->authTokenIf.addReference = Krb5AuthTokenIf_AddReference;
      pAuthTokenIfInstance->authTokenIf.releaseReference = Krb5AuthTokenIf_ReleaseReference;
      pAuthTokenIfInstance->authTokenIf.getAuthTokenCredentials = Krb5AuthTokenIf_GetAuthTokenCredentials;
      pAuthTokenIfInstance->authTokenIf.validateAuthTokenCredentials = Krb5AuthTokenIf_ValidateAuthTokenCredentials;

      // Keep track of this object
      pthread_mutex_lock(&g_authTokenIfMutex);
      g_numAuthTokenIfObjs ++;
      pthread_mutex_unlock(&g_authTokenIfMutex);

      // Return the interface to the caller
      *ppAuthTokenIf = &pAuthTokenIfInstance->authTokenIf;

      // Success
      retStatus = CASA_STATUS_SUCCESS;
   }
   else
   {
      DbgTrace(0, "krb5_token -GetAuthTokenInterface- Buffer allocation failure\n", 0);

      retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
                                  CASA_FACILITY_KRB5TOKEN,
                                  CASA_STATUS_INSUFFICIENT_RESOURCES);
   }

exit:

   DbgTrace(1, "krb5_token -GetAuthTokenInterface- End, retStatus = %08X\n", retStatus);

   return retStatus;
}


//++=======================================================================
//++=======================================================================
//++=======================================================================