1 files changed, 178 insertions, 0 deletions
diff --git a/library/ShadowCopy/shadow.cpp b/library/ShadowCopy/shadow.cpp
new file mode 100644
index 00000000..e10a4eb8
--- /dev/null
+++ b/library/ShadowCopy/shadow.cpp
@@ -0,0 +1,178 @@
+#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();
+}