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Callback parameters are different.

Also by EldoS: CallbackProcess
A component to control process creation and termination in Windows and .NET applications.
Posted: 04/24/2014 02:51:11
by jglee (Basic support level)
Joined: 04/01/2014
Posts: 13

When I called in my application

GENERIC_READ, // 0x80000000 DesiredAccess
NULL, // SecurityAttributes
OPEN_EXISTING, // 0x03 CreationDisposition
FILE_ATTRIBUTE_NORMAL, // FlagsAndAttributes

Callback OnOpenFileC() was called with parameters.

The parameters are
DesiredAccess= 0x2C0FF38,
FileAttributes= 0x80,
CreateOptions= 0x2C0FF34,
CreateDisposition= 0x2C0FF54.

The DesiredAccess, CreateDisposition of OnOpenFileC() and CreateFile() are different from each other.

I can't find GENERIC_READ value on DesiredAccess of OnOpenFileC().
Posted: 04/24/2014 04:07:01
by Volodymyr Zinin (EldoS Corp.)

"Generic" access rights are mapped by the system to a set of object-specific access rights. For example for file objects GENERIC_READ is mapped (converted) to FILE_READ_DATA | FILE_READ_ATTRIBUTES | FILE_READ_EA | SYNCHRONIZE. For mutex, event, etc objects the mapping will be different. That's why instead of simply 0x80000000 you see DesiredAccess as a set of bits.
About the CreateOptions and CreateDisposition parameters. It seems the OnCreate and OnOpen file callbacks don't contain such parameters. Please specify what version of CBFS and type of API (C++, Delphi, .NET, or Java) you are using.
Posted: 04/24/2014 04:53:00
by jglee (Basic support level)
Joined: 04/01/2014
Posts: 13

I use CallbackFilter Version 3.0.69 and Visual Studio 2012 C++ and C++ Sample BaseFilter included in CallbackFilter.
Posted: 04/24/2014 05:33:53
by jglee (Basic support level)
Joined: 04/01/2014
Posts: 13

Additionally, I retried calling the above and called

GENERIC_WRITE, // DesiredAccess
NULL, // ShareMode
NULL, // SecurityAttributes
CREATE_ALWAYS, // CreationDisposition
FILE_ATTRIBUTE_NORMAL, // FlagsAndAttributes

The parameters of OnOpenFileC() were identical.

I refered to the CallbackFilter document
Posted: 04/24/2014 05:47:03
by Vladimir Cherniga (EldoS Corp.)

Are you sure that parameters dereferenced ? They are declared as a pointers.
Posted: 04/24/2014 05:48:45
by Vladimir Cherniga (EldoS Corp.)

jglee wrote:
I refered to the CallbackFilter document https://www.eldos.com/documentation/cb...nfile.html

Did you talk about cbfs or cbflt ?
Posted: 04/24/2014 20:23:28
by jglee (Basic support level)
Joined: 04/01/2014
Posts: 13

I mistook 2 times. The parameters are pointers and I sent the wrong document URL.
I confused control event with notification event.
I am so sorry.
Thanks so much.
Also by EldoS: RawDisk
Access locked and protected files in Windows, read and write disks and partitions and more.



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