private static SafeFileHandle CreateFileInternal(string path, uint access, FileShare share, FileMode mode, uint attributes)
{
var securityAttributes = new SecurityAttributes();
securityAttributes.Length = Marshal.SizeOf(securityAttributes);
securityAttributes.SecurityDescriptor = IntPtr.Zero;
securityAttributes.InheritHandle = false;
if (share.HasFlag(FileShare.Inheritable))
{
share &= ~FileShare.Inheritable;
securityAttributes.InheritHandle = true;
}
SafeFileHandle fileHandle = CreateFileNative(path, access, share, ref securityAttributes, mode, attributes, IntPtr.Zero);
if (fileHandle.IsInvalid)
{
fileHandle.Close();
int hResult = Marshal.GetHRForLastWin32Error();
Marshal.ThrowExceptionForHR(hResult);
}
return(fileHandle);
}
public bool CheckShareRuleIsPermit(FileLockItem otherRule)
{
if (pIsDirectory != otherRule.IsDirectory)
{
return(false);
}
if (this.pIsDirectory)
{
return(true); // As long as CreateDirectory and OpenDirectory do not return correct FileShare/FileAccess values, this workaround must remain active.
}
if (this.pIsOpLock || otherRule.IsOpLock)
{
return(CheckShareOPLockIsPermit(otherRule));
}
FileShare shareO = otherRule.Share;
bool shareReadT = false;
bool shareWriteT = false;
bool shareReadO = false;
bool shareWriteO = false;
if (pShare.HasFlag(FileShare.Read))
{
shareReadT = true;
}
if (pShare.HasFlag(FileShare.Write))
{
shareWriteT = true;
}
if (pShare.HasFlag(FileShare.ReadWrite))
{
shareReadT = true; shareWriteT = true;
}
if (shareO.HasFlag(FileShare.Read))
{
shareReadO = true;
}
if (shareO.HasFlag(FileShare.Write))
{
shareWriteO = true;
}
if (shareO.HasFlag(FileShare.ReadWrite))
{
shareReadO = true; shareWriteO = true;
}
if (shareReadT == false && shareWriteT == false)
{
if (otherRule.AccessModeWrite || otherRule.AccessModeRead)
{
return(false); // Authorised Share: none
}
}
if (shareReadO == false && shareWriteO == false)
{
if (this.AccessModeWrite || this.AccessModeRead)
{
return(false); // Authorised Share: none
}
}
if (shareReadT == true && shareWriteT == false)
{
if (otherRule.AccessModeWrite == true)
{
return(false);
}
}
if (shareReadO == true && shareWriteO == false)
{
if (this.AccessModeWrite == true)
{
return(false);
}
}
if (shareReadT == false && shareWriteT == true)
{
if (otherRule.AccessModeRead == true)
{
return(false);
}
}
if (shareReadO == false && shareWriteO == true)
{
if (this.AccessModeRead == true)
{
return(false);
}
}
if (shareReadT == true && shareWriteT == true)
{
}
if (shareReadO == true && shareWriteO == true)
{
}
return(true);
}
public NtStatus CreateFile(string fileName, FileAccess access, FileShare share, FileMode mode, FileOptions options,
FileAttributes attributes, IDokanFileInfo info)
{
var result = NtStatus.Success;
var filePath = GetPath(fileName);
if (info.IsDirectory)
{
try
{
switch (mode)
{
case FileMode.Open:
if (!Directory.Exists(filePath))
{
try
{
if (!File.GetAttributes(filePath).HasFlag(FileAttributes.Directory))
{
return(NtStatus.NotADirectory);
}
}
catch (Exception)
{
return(DokanResult.FileNotFound);
}
return(DokanResult.PathNotFound);
}
new DirectoryInfo(filePath).EnumerateFileSystemInfos().Any();
// you can't list the directory
break;
case FileMode.CreateNew:
if (Directory.Exists(filePath))
{
return(DokanResult.FileExists);
}
try
{
File.GetAttributes(filePath).HasFlag(FileAttributes.Directory);
return(DokanResult.AlreadyExists);
}
catch (IOException)
{
}
Directory.CreateDirectory(GetPath(fileName));
break;
}
}
catch (UnauthorizedAccessException)
{
return(DokanResult.AccessDenied);
}
}
else
{
var pathExists = true;
var pathIsDirectory = false;
var readWriteAttributes = (access & DataAccess) == 0;
var readAccess = (access & DataWriteAccess) == 0;
try
{
pathExists = (Directory.Exists(filePath) || File.Exists(filePath));
pathIsDirectory = File.GetAttributes(filePath).HasFlag(FileAttributes.Directory);
}
catch (IOException)
{
}
switch (mode)
{
case FileMode.Open:
{
// Scan file before open
if ((access != FileAccess.Delete) && (access != FileAccess.ReadAttributes))
{
if (File.Exists(filePath))
{
try
{
bool executing = access.HasFlag(FileAccess.ReadData) &&
access.HasFlag(FileAccess.Execute) &&
access.HasFlag(FileAccess.ReadAttributes) &&
access.HasFlag(FileAccess.Synchronize) &&
share.HasFlag(FileShare.Read) &&
share.HasFlag(FileShare.Delete) &&
attributes.HasFlag(FileAttributes.Normal);
if (executing)
{
return(OnRequestFileOpen?.Invoke(filePath) ?? DokanResult.Success);
}
}
catch (Exception ex)
{
//ex.Log();
}
}
}
if (pathExists)
{
// check if driver only wants to read attributes, security info, or open directory
if (readWriteAttributes || pathIsDirectory)
{
if (pathIsDirectory && (access & FileAccess.Delete) == FileAccess.Delete &&
(access & FileAccess.Synchronize) != FileAccess.Synchronize)
{
//It is a DeleteFile request on a directory
return(DokanResult.AccessDenied);
}
info.IsDirectory = pathIsDirectory;
info.Context = new object();
// must set it to someting if you return DokanError.Success
return(DokanResult.Success);
}
}
else
{
return(DokanResult.FileNotFound);
}
}
break;
case FileMode.CreateNew:
if (pathExists)
{
return(DokanResult.FileExists);
}
break;
case FileMode.Truncate:
if (!pathExists)
{
return(DokanResult.FileNotFound);
}
break;
}
try
{
info.Context = new FileStream(filePath, mode,
readAccess ? System.IO.FileAccess.Read : System.IO.FileAccess.ReadWrite, share, 4096, options);
if (pathExists && (mode == FileMode.OpenOrCreate ||
mode == FileMode.Create))
{
result = DokanResult.AlreadyExists;
}
if (mode == FileMode.CreateNew || mode == FileMode.Create) //Files are always created as Archive
{
attributes |= FileAttributes.Archive;
}
File.SetAttributes(filePath, attributes);
}
catch (UnauthorizedAccessException) // don't have access rights
{
return(DokanResult.AccessDenied);
}
catch (DirectoryNotFoundException)
{
return(DokanResult.PathNotFound);
}
catch (Exception ex)
{
var hr = (uint)Marshal.GetHRForException(ex);
switch (hr)
{
case 0x80070020: //Sharing violation
return(DokanResult.SharingViolation);
default:
throw;
}
}
}
return(result);
}
