TransactedFileSink::TransactedFileSink(const KernelTransaction &tx, const wchar_t *path){
this->handle.reset(new HANDLE(nullptr), [](HANDLE *h){ CloseHandle(*h); delete h; });
static const DWORD open_modes[] = {
OPEN_EXISTING,
CREATE_ALWAYS,
};
static USHORT TXFS_MINIVERSION_DEFAULT_VIEW = 0xFFFE;
for (auto m : open_modes){
*this->handle = CreateFileTransactedW(
path,
GENERIC_WRITE,
0,
nullptr,
m,
0,
nullptr,
tx.get_handle(),
&TXFS_MINIVERSION_DEFAULT_VIEW,
nullptr
);
if (*this->handle != INVALID_HANDLE_VALUE)
break;
}
if (*this->handle == INVALID_HANDLE_VALUE){
auto error = GetLastError();
throw Win32Exception(error);
}
SetFilePointer(*this->handle, 0, 0, FILE_END);
}
bool os_link_symbolic_junctions_raw(const std::string &target, const std::string &lname, void* transaction)
{
bool ret = false;
HANDLE hJunc = INVALID_HANDLE_VALUE;
char* buf = NULL;
std::wstring wtarget = ConvertToWchar(target);
std::wstring wlname = ConvertToWchar(lname);
if (transaction != NULL)
{
if (!CreateDirectoryTransactedW(NULL, wlname.c_str(), NULL, transaction))
{
goto cleanup;
}
}
else
{
if (!CreateDirectoryW(wlname.c_str(), NULL))
{
goto cleanup;
}
}
if (transaction != NULL)
{
USHORT mversion = 0xFFFF;
hJunc = CreateFileTransactedW(wlname.c_str(), GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_FLAG_OPEN_REPARSE_POINT | FILE_FLAG_BACKUP_SEMANTICS, NULL,
transaction, &mversion, NULL);
}
else
{
hJunc = CreateFileW(wlname.c_str(), GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_FLAG_OPEN_REPARSE_POINT | FILE_FLAG_BACKUP_SEMANTICS, NULL);
}
if(hJunc==INVALID_HANDLE_VALUE)
goto cleanup;
size_t bsize=sizeof(REPARSE_MOUNTPOINT_DATA_BUFFER) + (wtarget.size()+1) * sizeof(wchar_t)+30;
buf=new char[bsize];
memset(buf, 0, bsize);
REPARSE_MOUNTPOINT_DATA_BUFFER *rb=(REPARSE_MOUNTPOINT_DATA_BUFFER*)buf;
rb->ReparseTag=IO_REPARSE_TAG_MOUNT_POINT;
rb->ReparseTargetMaximumLength=(WORD)((wtarget.size()+1)*sizeof(wchar_t));
rb->ReparseTargetLength=rb->ReparseTargetMaximumLength-1*sizeof(wchar_t);
rb->ReparseDataLength=rb->ReparseTargetLength+12;
memcpy(rb->ReparseTarget, wtarget.c_str(), rb->ReparseTargetMaximumLength);
DWORD bytes_ret;
if(!DeviceIoControl(hJunc, FSCTL_SET_REPARSE_POINT, rb, rb->ReparseDataLength+REPARSE_MOUNTPOINT_HEADER_SIZE, NULL, 0, &bytes_ret, NULL) )
{
goto cleanup;
}
ret=true;
cleanup:
DWORD lasterr;
if(!ret)
{
lasterr = GetLastError();
Log("Creating junction failed. Last error="+convert((int)GetLastError()), LL_ERROR);
}
delete []buf;
if(hJunc!=INVALID_HANDLE_VALUE)
CloseHandle(hJunc);
if(!ret)
{
if (transaction != NULL)
RemoveDirectoryTransactedW(ConvertToWchar(lname).c_str(), transaction);
else
RemoveDirectoryW(ConvertToWchar(lname).c_str());
SetLastError(lasterr);
}
return ret;
}