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#include "shadow.h"
#define WIN32_LEAN_AND_MEAN
#include "windows.h"
#include "inc/vss.h"
#include "inc/vswriter.h"
#include "inc/vsbackup.h"
#include <algorithm>
#include <string>
#include <cstdio>
#include <comdef.h>
//typedef GUID VSS_ID;
void writeString(const wchar_t* input, wchar_t* output, unsigned int outputBufferLen)
{
const unsigned int newSize = min(wcslen(input) + 1, outputBufferLen); //including null-termination
memcpy(output, input, newSize * sizeof(wchar_t));
}
std::wstring numberToHexString(const long number)
{
wchar_t result[100];
swprintf(result, 100, L"0x%08x", number);
return std::wstring(result);
}
void writeErrorMsg(const wchar_t* input, HRESULT hr, wchar_t* output, unsigned int outputBufferLen)
{
std::wstring formattedMsg(input);
formattedMsg += L" (";
formattedMsg += numberToHexString(hr);
formattedMsg += L": ";
formattedMsg += _com_error(hr).ErrorMessage();
formattedMsg += L")";
writeString(formattedMsg.c_str(), output, outputBufferLen);
}
bool shadow::createShadowCopy(const wchar_t* volumeName,
wchar_t* shadowVolName,
unsigned int shadowBufferLen,
void** backupHandle,
wchar_t* errorMessage,
unsigned int errorBufferLen)
{
//MessageBox(0, L"backup err", L"", 0); */
*backupHandle = NULL;
HRESULT hr = NULL;
IVssBackupComponents* pBackupComponents = NULL;
if (FAILED(hr = CreateVssBackupComponents(&pBackupComponents)))
{
if (hr == E_ACCESSDENIED)
writeErrorMsg(L"The caller does not have sufficient backup privileges or is not an administrator.", hr, errorMessage, errorBufferLen);
else
writeErrorMsg(L"Error calling \"CreateVssBackupComponents\".", hr, errorMessage, errorBufferLen);
return false;
}
if (FAILED(hr = pBackupComponents->InitializeForBackup()))
{
releaseShadowCopy(pBackupComponents);
writeErrorMsg(L"Error calling \"InitializeForBackup\".", hr, errorMessage, errorBufferLen);
return false;
}
IVssAsync* pWriteMetaData = NULL;
if (FAILED(hr = pBackupComponents->GatherWriterMetadata( &pWriteMetaData )))
{
releaseShadowCopy(pBackupComponents);
writeErrorMsg(L"\"Shadow.dll\" might be incompatible with this Operating System!\n\
Error calling \"GatherWriterMetadata\".", hr, errorMessage, errorBufferLen);
return false;
}
//wait for shadow copy writers to complete
hr = pWriteMetaData->Wait();
pWriteMetaData->Release();
if (FAILED(hr))
{
releaseShadowCopy(pBackupComponents);
writeErrorMsg(L"Error calling \"ppWriteMetaData->Wait\".", hr, errorMessage, errorBufferLen);
return false;
}
VSS_ID snapshotSetId = {0};
if (FAILED(hr = pBackupComponents->StartSnapshotSet( &snapshotSetId )))
{
releaseShadowCopy(pBackupComponents);
writeErrorMsg(L"Error calling \"StartSnapshotSet\".", hr, errorMessage, errorBufferLen);
return false;
}
VSS_ID SnapShotId = {0};
if (FAILED(hr = pBackupComponents->AddToSnapshotSet(const_cast<wchar_t*>(volumeName), GUID_NULL, &SnapShotId)))
{
releaseShadowCopy(pBackupComponents);
writeErrorMsg(L"Error calling \"AddToSnapshotSet\".", hr, errorMessage, errorBufferLen);
return false;
}
if (FAILED(hr = pBackupComponents->SetBackupState( false, false, VSS_BT_FULL )))
{
releaseShadowCopy(pBackupComponents);
writeErrorMsg(L"Error calling \"SetBackupState\".", hr, errorMessage, errorBufferLen);
return false;
}
IVssAsync* pPrepare = NULL;
if (FAILED(hr = pBackupComponents->PrepareForBackup( &pPrepare )))
{
releaseShadowCopy(pBackupComponents);
writeErrorMsg(L"Error calling \"PrepareForBackup\".", hr, errorMessage, errorBufferLen);
return false;
}
hr = pPrepare->Wait();
pPrepare->Release();
if (FAILED(hr))
{
releaseShadowCopy(pBackupComponents);
writeErrorMsg(L"Error calling \"pPrepare->Wait\".", hr, errorMessage, errorBufferLen);
return false;
}
IVssAsync* pDoShadowCopy = NULL;
if (FAILED(hr = pBackupComponents->DoSnapshotSet( &pDoShadowCopy )))
{
releaseShadowCopy(pBackupComponents);
writeErrorMsg(L"Error calling \"DoSnapshotSet\".", hr, errorMessage, errorBufferLen);
return false;
}
hr = pDoShadowCopy->Wait();
pDoShadowCopy->Release();
if (FAILED(hr))
{
releaseShadowCopy(pBackupComponents);
writeErrorMsg(L"Error calling \"pPrepare->Wait\".", hr, errorMessage, errorBufferLen);
return false;
}
VSS_SNAPSHOT_PROP props;
if (FAILED(hr = pBackupComponents->GetSnapshotProperties( SnapShotId, &props )))
{
releaseShadowCopy(pBackupComponents);
writeErrorMsg(L"Error calling \"GetSnapshotProperties\".", hr, errorMessage, errorBufferLen);
return false;
}
//finally: write volume name of newly created shadow copy
writeString(props.m_pwszSnapshotDeviceObject, shadowVolName, shadowBufferLen);
VssFreeSnapshotProperties(&props);
*backupHandle = pBackupComponents;
return true;
}
void shadow::releaseShadowCopy(void* backupHandle)
{
if (backupHandle != NULL)
static_cast<IVssBackupComponents*>(backupHandle)->Release();
}
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