tools/vtpm_manager/tcs/tcs.c


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// ===================================================================
// 
// Copyright (c) 2005, Intel Corp.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without 
// modification, are permitted provided that the following conditions 
// are met:
//
//   * Redistributions of source code must retain the above copyright 
//     notice, this list of conditions and the following disclaimer.
//   * 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.
//   * Neither the name of Intel Corporation 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 THE 
// COPYRIGHT OWNER 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.
// ===================================================================
// 
// tcs.c
// 
//  This file contains the functions that implement a TCS.
// 
// ==================================================================

#include <stdio.h>
#include <string.h>
#include <malloc.h>

#include "tcg.h"
#include "bsg.h"
#include "tcs.h"
#include "contextmgr.h"
#include "tpmddl.h"
#include "log.h"
#include "hashtable.h"
#include "hashtable_itr.h"

// Static Global Vars for the TCS
static int TCS_m_nCount = 0;

#define TCPA_MAX_BUFFER_LENGTH 0x2000

static BYTE InBuf [TCPA_MAX_BUFFER_LENGTH];
static BYTE OutBuf[TCPA_MAX_BUFFER_LENGTH];

struct hashtable *context_ht;

// -------------------------- Hash table functions --------------------

static unsigned int hashfunc32(void *ky) {
  return (* (UINT32 *) ky);
}

static int equals32(void *k1, void *k2) {
  return (*(UINT32 *) k1 == *(UINT32 *) k2);
}

CONTEXT_HANDLE *LookupContext( TCS_CONTEXT_HANDLE  hContext) {
  return( (CONTEXT_HANDLE *) hashtable_search(context_ht, &hContext) );
}

// ---------------------------------------------------------------------------------
// Initialization/Uninitialization SubComponent API
// ---------------------------------------------------------------------------------
TPM_RESULT TCS_create() {
  TDDL_RESULT hRes = TDDL_E_FAIL;
  TPM_RESULT result = TPM_FAIL;
  
  if (TCS_m_nCount == 0) {
    vtpmloginfo(VTPM_LOG_TCS, "Constructing new TCS:\n");
    hRes = TDDL_Open();

    context_ht = create_hashtable(10, hashfunc32, equals32);
	  
    if ((hRes == TDDL_SUCCESS) && (context_ht != NULL)) {
      result = TPM_SUCCESS;
      TCS_m_nCount++;
    } else {
      result = TPM_IOERROR;
      hashtable_destroy(context_ht, 1);
    }
  } else
    TCS_m_nCount++;
    
  return(result);
}


void TCS_destroy()
{
  TCS_m_nCount--;
  
  if (TCS_m_nCount == 0) {
    vtpmloginfo(VTPM_LOG_TCS, "Destructing TCS:\n");
    TDDL_Close();

    struct hashtable_itr *context_itr;
    TCS_CONTEXT_HANDLE  *hContext;
    
    // Close all the TCS contexts. TCS should evict keys based on this
    if (hashtable_count(context_ht) > 0) {
      context_itr = hashtable_iterator(context_ht);
      do {
        hContext = (TCS_CONTEXT_HANDLE *) hashtable_iterator_key(context_itr);
	if (TCS_CloseContext(*hContext) != TPM_SUCCESS) 
	    vtpmlogerror(VTPM_LOG_TCS, "Failed to close context %d properly.\n", *hContext);
      
      } while (hashtable_iterator_advance(context_itr));
      free(context_itr);
    }
    hashtable_destroy(context_ht, 1);
  }
  
}

TPM_RESULT TCS_Malloc(  TCS_CONTEXT_HANDLE  hContext, // in
                        UINT32              MemSize, // in
                        BYTE**              ppMemPtr) {// out

  TPM_RESULT returnCode = TPM_FAIL;
  CONTEXT_HANDLE* pContextHandle = LookupContext(hContext);
  
  if (pContextHandle != NULL && ppMemPtr != NULL) {
    *ppMemPtr = (BYTE *)AddMemBlock(pContextHandle, MemSize);
    returnCode = TPM_SUCCESS;
  }
  
  return returnCode;
}

TPM_RESULT TCS_FreeMemory(  TCS_CONTEXT_HANDLE  hContext, // in
                            BYTE*               pMemory) { // in
  TPM_RESULT returnCode = TPM_FAIL;
  CONTEXT_HANDLE* pContextHandle = LookupContext(hContext);
  
  if ( (pContextHandle != NULL && pMemory != NULL) &&
       (DeleteMemBlock(pContextHandle, pMemory) == TRUE) )
    returnCode = TPM_SUCCESS;
 
  
  return returnCode;
}

TPM_RESULT TCS_OpenContext(TCS_CONTEXT_HANDLE* hContext) { // out
  TPM_RESULT returnCode = TPM_FAIL;
  TCS_CONTEXT_HANDLE *newContext;
  
  vtpmloginfo(VTPM_LOG_TCS, "Calling TCS_OpenContext:\n");
  
  if (hContext) {
    CONTEXT_HANDLE* pContextHandle = (CONTEXT_HANDLE *) malloc(sizeof(CONTEXT_HANDLE));
    if (pContextHandle == NULL) 
      return TPM_SIZE;
    
    // initialize to 0
    pContextHandle->nBlockCount = 0;
    pContextHandle->pTopBlock = NULL;
    pContextHandle->pHandleList = NULL;
    
    // Create New Block
    AddMemBlock(pContextHandle, BLOCK_SIZE);
    
    newContext = (TCS_CONTEXT_HANDLE *) malloc(sizeof(TCS_CONTEXT_HANDLE));
    *newContext = (TCS_CONTEXT_HANDLE) (((uintptr_t) pContextHandle >> 2) & 0xffffffff);