/// <remarks>
/// 'NoRemoteChangeNotify' can be set in the registry to prevent the client from sending ChangeNotify requests altogether.
/// </remarks>
internal static SMB2Command GetChangeNotifyInterimResponse(ChangeNotifyRequest request, ISMBShare share, SMB2ConnectionState state)
{
SMB2Session session = state.GetSession(request.Header.SessionID);
OpenFileObject openFile = session.GetOpenFileObject(request.FileId);
bool watchTree = (request.Flags & ChangeNotifyFlags.WatchTree) > 0;
SMB2AsyncContext asyncContext = state.CreateAsyncContext(request.FileId, state, request.Header.SessionID, request.Header.TreeID);
// We have to make sure that we don't send an interim response after the final response.
lock (asyncContext)
{
NTStatus status = share.FileStore.NotifyChange(out asyncContext.IORequest, openFile.Handle, request.CompletionFilter, watchTree, (int)request.OutputBufferLength, OnNotifyChangeCompleted, asyncContext);
if (status == NTStatus.STATUS_PENDING)
{
state.LogToServer(Severity.Verbose, "NotifyChange: Monitoring of '{0}{1}' started. AsyncID: {2}.", share.Name, openFile.Path, asyncContext.AsyncID);
}
else if (status == NTStatus.STATUS_NOT_SUPPORTED)
{
// [MS-SMB2] If the underlying object store does not support change notifications, the server MUST fail this request with STATUS_NOT_SUPPORTED.
// Unfortunately, Windows 7 / 8 / 10 will immediately retry sending another ChangeNotify request upon getting STATUS_NOT_SUPPORTED,
// To prevent flooding, we must return a valid interim response (Status set to STATUS_PENDING and SMB2_FLAGS_ASYNC_COMMAND bit is set in Flags).
status = NTStatus.STATUS_PENDING;
}
else
{
state.RemoveAsyncContext(asyncContext);
}
ErrorResponse response = new ErrorResponse(request.CommandName, status);
if (status == NTStatus.STATUS_PENDING)
{
response.Header.IsAsync = true;
response.Header.AsyncID = asyncContext.AsyncID;
}
return(response);
}
}
internal static SMB2Command GetChangeNotifyInterimResponse(ChangeNotifyRequest request, ISMBShare share, SMB2ConnectionState state)
{
SMB2Session session = state.GetSession(request.Header.SessionID);
OpenFileObject openFile = session.GetOpenFileObject(request.FileId);
bool watchTree = (request.Flags & ChangeNotifyFlags.WatchTree) > 0;
SMB2AsyncContext context = state.CreateAsyncContext(request.FileId, state, request.Header.SessionID, request.Header.TreeID);
// We have to make sure that we don't send an interim response after the final response.
lock (context)
{
NTStatus status = share.FileStore.NotifyChange(out context.IORequest, openFile.Handle, request.CompletionFilter, watchTree, (int)request.OutputBufferLength, OnNotifyChangeCompleted, context);
if (status == NTStatus.STATUS_PENDING)
{
state.LogToServer(Severity.Verbose, "NotifyChange: Monitoring of '{0}{1}' started. AsyncID: {2}.", share.Name, openFile.Path, context.AsyncID);
}
// [MS-SMB2] If the underlying object store does not support change notifications, the server MUST fail this request with STATUS_NOT_SUPPORTED
ErrorResponse response = new ErrorResponse(request.CommandName, status);
// Windows 7 / 8 / 10 will infinitely retry sending ChangeNotify requests if the response does not have SMB2_FLAGS_ASYNC_COMMAND set.
// Note: NoRemoteChangeNotify can be set in the registry to prevent the client from sending ChangeNotify requests altogether.
response.Header.IsAsync = true;
response.Header.AsyncID = context.AsyncID;
return(response);
}
}
