Hooking NdisSend has no sense anymore, if you take a look in ndis. However, these four functions need to be intercepted somehow. Right at the beginning of this part I already marked, that it is desirable to familiarize with the PE-format, this knowledge is necessary for the interception. The essence of the technology is reduced to that it is necessary to find ndis. All necessary structures for operation with PE-image are in the winnt. In Windows NT 4. The problem is that Windows protects a kernel image from possible modification.
To resolve this problem, there are two possible ways:. I do not put here the code for modification of the export table, mainly because it is not a unique way to intercept NDIS function. Daniel Lanciany in his variant of NDIS-hooking driver has gone in another way, he has updated the beginning of functions, having inserted in them transitions to his code.
In his handler, he restores a body of the intercepted function, makes necessary operations on processing call, calls the restored function, and after return from it again modifies the beginning. As far as calls to these four functions set are not so often, this way is not much worse than editing of the export table, except one important drawback.
The further operation in many respects is similar to writing of the driver of the network protocol; therefore, I would advise familiarizing with appropriate section NT DDK Network Drivers. The only complex enough moment is about new handler for NdisOpenAdapter. This structure is defined in ndis.
This is important for us because it gives access to outgoing from the protocol traffic fields SendHandler, SendPacketsHandler, and TransferDataHandler. The following code fragment is taken from the new NdisOpenAdapter handler:. Thus, the driver with minimum functionality turns out small enough and not, but may appear a bit complex in implementation. Besides the described static way of hooking NDIS library functions which demands loading the driver at a stage of the start of the operating system and as such this driver cannot be unloaded from memory, there is one more dynamic approach.
Among products existing in the market, it is applied besides control TDI and all started processes in the system in rather known firewall ZoneAlarm with widely recognized TrueVector technology.
The essence of the approach that we register the dummy protocol call NdisRegisterProtocol i. This protocol is one simple purpose to receive NdisProtocolHandle. The further is practically obvious, moving the list of registered protocols; we substitute the handlers where it is necessary.
However, despite apparent simplicity, this method is not simple and also demands the big care as we interfere with the functionality of already working system. So, we superficially considered the majority of approaches to the firewall creation for the Windows platform, and the variant with interception NDIS was reviewed, as it seems to me, rather in details.
However the DDK just provide the environment for building the device driver such as the header files and libraries for the targeted platform.
We may need other tools such as source code editor, and try getting the idea from Windows device driver developer. Debugging Tools for Windows features WinDbg, a powerful debugger with a graphical interface that can debug both user-mode and kernel-mode code. The documentation in Debugging Tools for Windows describes the use of these debuggers and includes tips for user-mode and kernel-mode debugging.
Debugging Tools for Windows is available in three different versions:. The bit version is appropriate for most users. If you are planning on debugging a user-mode application on an Itanium-based processor, you should install the Itanium version of the debuggers. If you are planning on debugging a user-mode application on an x64 processor, you should select the x64 version of the debuggers.
The Itanium and x64 debuggers can be installed only on bit versions of Windows. These debugging tools require approximately 25 MB of hard disk space. If it is not convenient to visit this site, you can install Debugging Tools for Windows directly from this CD. There is no 'Itanium' version.
However, when referring to the Windows DDK documentation, when a build environment title contains the term "64 bit," this refers to the Intel Itanium architecture.
My father is currently developing some code that needs to use a USB Small plea for help if anyone can My father is currently developing some code that needs to use a USB sniffer which the author has licensed as freely modifiable. Only problem is the author wrote the thing using the Win2k DDK and of course it's no longer available.
Is there anyone who can help provide a copy from their archive of MSDN disks or similar. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy. When the host sends a multipacket message to the device, it will adhere to the PacketAlignmentFactor that the device specifies. Message length in bytes, including appended packet data, OOB data, per-packet information data, and both internal and external padding.
Specifies the offset in bytes from the start of the DataOffset field of this message to the start of the data. This is an integer multiple of 4. Specifies the offset in bytes of the first OOB data record from the start of the DataOffset field of this message.
Set to zero if there is no OOB data.
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