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#include "shadow.h"
#include <wx/msw/wrapwin.h> //includes "windows.h"
#include <wx/intl.h>
#include "systemConstants.h"
using FreeFileSync::ShadowCopy;
bool newerThanXP()
{
OSVERSIONINFO osvi;
ZeroMemory(&osvi, sizeof(OSVERSIONINFO));
osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
//symbolic links are supported starting with Vista
if (GetVersionEx(&osvi))
return osvi.dwMajorVersion > 5 ||
(osvi.dwMajorVersion == 5 && osvi.dwMinorVersion > 1) ;
//XP has majorVersion == 5, minorVersion == 1
//Server 2003 has majorVersion == 5, minorVersion == 2
//version overview: http://msdn.microsoft.com/en-us/library/ms724834(VS.85).aspx
return false;
}
bool runningWOW64() //test if process is running under WOW64 (reference http://msdn.microsoft.com/en-us/library/ms684139(VS.85).aspx)
{
typedef BOOL (WINAPI *IsWow64ProcessFunc)(
HANDLE hProcess,
PBOOL Wow64Process);
const IsWow64ProcessFunc isWow64Process = reinterpret_cast<IsWow64ProcessFunc>(
::GetProcAddress(GetModuleHandle(TEXT("kernel32")), "IsWow64Process"));
if (isWow64Process != NULL)
{
BOOL isWow64 = FALSE;
if ((*isWow64Process)(::GetCurrentProcess(), &isWow64))
return isWow64 == TRUE;
}
return false;
}
class ShadowCopy::ShadowlDllHandler //dynamically load windows API functions
{
typedef bool (*CreateShadowCopyFct)( //volumeName must end with "\", while shadowVolName does not end with "\"
const wchar_t* volumeName,
wchar_t* shadowVolName,
unsigned int shadowBufferLen,
void** backupHandle,
wchar_t* errorMessage,
unsigned int errorBufferLen);
typedef void (*ReleaseShadowCopyFct)(void* backupHandle);
public:
static const wxString& getShadowDllName()
{
/*
distinguish a bunch of VSS builds: we use XP and Server 2003 implementations...
VSS version and compatibility overview: http://msdn.microsoft.com/en-us/library/aa384627(VS.85).aspx
*/
#if defined _WIN64 //note: _WIN32 is defined for 64-bit compilations, too, while _WIN64 only for 64-bit
static const wxString filename(newerThanXP() ?
wxT("Shadow_Server2003_x64.dll") :
wxT("Shadow_XP_x64.dll"));
#elif defined(_WIN32)
static const wxString filename(newerThanXP() ?
wxT("Shadow_Server2003_win32.dll") :
wxT("Shadow_XP_win32.dll"));
#else
Are we at 128 bit already?
#endif
return filename;
}
ShadowlDllHandler() :
createShadowCopy(NULL),
releaseShadowCopy(NULL),
hShadow(NULL)
{
//get a handle to the DLL module containing the required functionality
hShadow = ::LoadLibrary(getShadowDllName().c_str());
if (hShadow)
{
createShadowCopy = reinterpret_cast<CreateShadowCopyFct>(::GetProcAddress(hShadow, "createShadowCopy"));
releaseShadowCopy = reinterpret_cast<ReleaseShadowCopyFct>(::GetProcAddress(hShadow, "releaseShadowCopy"));
}
}
~ShadowlDllHandler()
{
if (hShadow) ::FreeLibrary(hShadow);
}
CreateShadowCopyFct createShadowCopy;
ReleaseShadowCopyFct releaseShadowCopy;
private:
HINSTANCE hShadow;
};
//#############################################################################################################
ShadowCopy::ShadowCopy() :
backupHandle(NULL)
{
shadowDll = new ShadowlDllHandler;
}
ShadowCopy::~ShadowCopy()
{
if (backupHandle != NULL)
shadowDll->releaseShadowCopy(backupHandle);
delete shadowDll;
}
Zstring ShadowCopy::makeShadowCopy(const Zstring& inputFile)
{
//check if shadow copy dll was loaded correctly
if ( shadowDll->createShadowCopy == NULL ||
shadowDll->releaseShadowCopy == NULL)
{
wxString errorMsg = _("Error copying locked file %x!");
errorMsg.Replace(wxT("%x"), wxString(wxT("\"")) + inputFile.c_str() + wxT("\""));
throw FileError(errorMsg + wxT("\n\n") + _("Error starting Volume Shadow Copy Service!") + wxT("\n") +
_("Could not load a required DLL:") + wxT(" \"") + ShadowlDllHandler::getShadowDllName() + wxT("\""));
}
//VSS does not support running under WOW64 except for Windows XP and Windows Server 2003
//(Reference: http://msdn.microsoft.com/en-us/library/aa384627(VS.85).aspx)
static const bool wow64Active = runningWOW64();
if (wow64Active)
{
wxString errorMsg = _("Error copying locked file %x!");
errorMsg.Replace(wxT("%x"), wxString(wxT("\"")) + inputFile.c_str() + wxT("\""));
throw FileError(errorMsg + wxT("\n\n") + _("Error starting Volume Shadow Copy Service!") + wxT("\n") +
_("Making shadow copies on WOW64 is not supported. Please use FreeFileSync 64-bit version."));
}
//---------------------------------------------------------------------------------------------------------
wchar_t volumeNameRaw[1000];
if (!GetVolumePathName(inputFile.c_str(), //__in LPCTSTR lpszFileName,
volumeNameRaw, //__out LPTSTR lpszVolumePathName,
1000)) //__in DWORD cchBufferLength
{
wxString errorMsg = _("Error copying locked file %x!");
errorMsg.Replace(wxT("%x"), wxString(wxT("\"")) + inputFile.c_str() + wxT("\""));
throw FileError(errorMsg + wxT("\n\n") + _("Could not determine volume name for file:") + wxT("\n\"") + inputFile.c_str() + wxT("\""));
}
Zstring volumeNameFormatted = volumeNameRaw;
if (!volumeNameFormatted.EndsWith(globalFunctions::FILE_NAME_SEPARATOR))
volumeNameFormatted += globalFunctions::FILE_NAME_SEPARATOR;
if (volumeNameFormatted != realVolumeLast)
{
//release old shadow copy
if (backupHandle != NULL)
{
shadowDll->releaseShadowCopy(backupHandle);
backupHandle = NULL;
}
realVolumeLast.clear(); //...if next call fails...
shadowVolumeLast.clear(); //...if next call fails...
//start shadow volume copy service:
wchar_t shadowVolName[1000];
void* backupHandleTmp = NULL;
wchar_t errorMessage[1000];
if (!shadowDll->createShadowCopy(
volumeNameFormatted.c_str(),
shadowVolName,
1000,
&backupHandleTmp,
errorMessage,
1000))
{
wxString errorMsg = _("Error copying locked file %x!");
errorMsg.Replace(wxT("%x"), Zstring(wxT("\"")) + inputFile + wxT("\""));
throw FileError(errorMsg + wxT("\n\n") + _("Error starting Volume Shadow Copy Service!") + wxT("\n") +
wxT("(") + errorMessage + wxT(")"));
}
realVolumeLast = volumeNameFormatted;
shadowVolumeLast = Zstring(shadowVolName) + globalFunctions::FILE_NAME_SEPARATOR; //shadowVolName NEVER has a trailing backslash
backupHandle = backupHandleTmp;
}
const size_t pos = inputFile.find(volumeNameFormatted);
if (pos == Zstring::npos)
{
wxString errorMsg = _("Error copying locked file %x!");
errorMsg.Replace(wxT("%x"), Zstring(wxT("\"")) + inputFile + wxT("\""));
wxString msg = _("Volume name %x not part of filename %y!");
msg.Replace(wxT("%x"), wxString(wxT("\"")) + volumeNameFormatted.c_str() + wxT("\""), false);
msg.Replace(wxT("%y"), wxString(wxT("\"")) + inputFile.c_str() + wxT("\""), false);
throw FileError(errorMsg + wxT("\n\n") + msg);
}
//return filename alias on shadow copy volume
return shadowVolumeLast + Zstring(inputFile.c_str() + pos + volumeNameFormatted.length());
}
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