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/*
* Copyright (c) 2010 .SE (The Internet Infrastructure Foundation)
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/*****************************************************************************
library.cpp
Support function for handling PKCS#11 libraries
*****************************************************************************/
#include <config.h>
#include "library.h"
#include <stdio.h>
#include <stdlib.h>
#if defined(HAVE_DLOPEN)
#include <dlfcn.h>
#endif
// Load the PKCS#11 library
CK_C_GetFunctionList loadLibrary(char* module, void** moduleHandle,
char **pErrMsg)
{
CK_C_GetFunctionList pGetFunctionList = NULL;
#if defined(HAVE_LOADLIBRARY)
HINSTANCE hDLL = NULL;
DWORD dw = NULL;
static char errMsg[100];
// Load PKCS #11 library
if (module)
{
hDLL = LoadLibraryA(module);
}
else
{
hDLL = LoadLibraryA(DEFAULT_PKCS11_LIB);
}
if (hDLL == NULL)
{
// Failed to load the PKCS #11 library
dw = GetLastError();
snprintf((char*)errMsg, sizeof(errMsg), "LoadLibraryA failed: 0x%08X", dw);
*pErrMsg = errMsg;
return NULL;
}
else
{
*pErrMsg = NULL;
}
// Retrieve the entry point for C_GetFunctionList
pGetFunctionList = (CK_C_GetFunctionList) GetProcAddress(hDLL, "C_GetFunctionList");
if (pGetFunctionList == NULL)
{
dw = GetLastError();
snprintf((char*)errMsg, sizeof(errMsg), "getProcAddress failed: 0x%08X", dw);
*pErrMsg = errMsg;
FreeLibrary(hDLL);
return NULL;
}
// Store the handle so we can FreeLibrary it later
*moduleHandle = hDLL;
#elif defined(HAVE_DLOPEN)
void* pDynLib = NULL;
// Load PKCS #11 library
if (module)
{
pDynLib = dlopen(module, RTLD_NOW | RTLD_LOCAL);
}
else
{
pDynLib = dlopen(DEFAULT_PKCS11_LIB, RTLD_NOW | RTLD_LOCAL);
}
*pErrMsg = dlerror();
if (pDynLib == NULL || *pErrMsg != NULL)
{
if (pDynLib != NULL) dlclose(pDynLib);
// Failed to load the PKCS #11 library
return NULL;
}
// Retrieve the entry point for C_GetFunctionList
pGetFunctionList = (CK_C_GetFunctionList) dlsym(pDynLib, "C_GetFunctionList");
// Store the handle so we can dlclose it later
*pErrMsg = dlerror();
if (*pErrMsg != NULL)
{
dlclose(pDynLib);
// An error occured during dlsym()
return NULL;
}
*moduleHandle = pDynLib;
#else
fprintf(stderr, "ERROR: Not compiled with library support.\n");
return NULL;
#endif
return pGetFunctionList;
}
void unloadLibrary(void* moduleHandle)
{
if (moduleHandle)
{
#if defined(HAVE_LOADLIBRARY)
FreeLibrary((HMODULE) moduleHandle);
#elif defined(HAVE_DLOPEN)
dlclose(moduleHandle);
#endif
}
}
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