internal static SMB2Command GetCancelResponse(CancelRequest request, SMB2ConnectionState state)
{
SMB2Session session = state.GetSession(request.Header.SessionID);
if (request.Header.IsAsync)
{
SMB2AsyncContext context = state.GetAsyncContext(request.Header.AsyncID);
if (context != null)
{
ISMBShare share = session.GetConnectedTree(context.TreeID);
OpenFileObject openFile = session.GetOpenFileObject(context.FileID);
NTStatus status = share.FileStore.Cancel(context.IORequest);
if (openFile != null)
{
state.LogToServer(Severity.Information, "Cancel: Requested cancel on '{0}{1}'. NTStatus: {2}, AsyncID: {3}.", share.Name, openFile.Path, status, context.AsyncID);
}
if (status == NTStatus.STATUS_SUCCESS ||
status == NTStatus.STATUS_CANCELLED ||
status == NTStatus.STATUS_NOT_SUPPORTED) // See ChangeNotifyHelper.cs
{
state.RemoveAsyncContext(context);
// [MS-SMB2] If the target request is successfully canceled, the target request MUST be failed by sending
// an ERROR response packet [..] with the status field of the SMB2 header set to STATUS_CANCELLED.
ErrorResponse response = new ErrorResponse(request.CommandName, NTStatus.STATUS_CANCELLED);
response.Header.IsAsync = true;
response.Header.AsyncID = context.AsyncID;
return(response);
}
// [MS-SMB2] If the target request is not successfully canceled [..] no response is sent.
// Note: Failing to respond might cause the client to disconnect the connection as per [MS-SMB2] 3.2.6.1 Request Expiration Timer Event
return(null);
}
else
{
// [MS-SMB2] If a request is not found [..] no response is sent.
return(null);
}
}
else
{
// [MS-SMB2] the SMB2 CANCEL Request MUST use an ASYNC header for canceling requests that have received an interim response.
// [MS-SMB2] If the target request is not successfully canceled [..] no response is sent.
return(null);
}
}