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 Forums >>  Brainstorms - General  >>  IPC sniffer

Topic created on: January 2, 2006 09:04 CST by adamx .


I want an IPC sniffer.  The top two forms of IPC I need to intercept and decode are

1) local RPC messages ("ncalrpc")
2) Window messages (e.g. WM_*)

Does anyone know if something that does this or anything close already exists?  I don't want to reinvent the wheel.

  injstar     January 2, 2006 11:50.09 CST
Hey
about WM_ messages i guess spy++ can do the job
(its one of the MSVC tools)
about the  RPC "ncalprc" i didnt really tackle  such tool
but if u intersting in making one i guess one way will be is to find the RPC functions server pointers table
technical
the #1 param of RpcServerRegisterIf/RpcServerRegisterIf2
are RPC_IF_HANDLE
it will let u find the RPC_SERVER_INTERFACE structure and from there u reach RPC_DISPATCH_TABLE and thats it inside it u have pointer to the RPC functions table  
about the parmas of those interface function i guess your next step is to find the
__MIDL_TypeFormatString and __MIDL_ProcFormatString structure and parse them (but the same can be done on the client side that call those ncalpc functions)

  stephanc     January 10, 2006 23:15.45 CST
If you are looking to create a tool to capture Window Messages you can use the windows api function SetWindowsHookEx.

idHook=WH_CBT or WH_CALLWNDPROC are probably what you want to use.

MSDN: SetWindowsHookEx



  9435cge     January 28, 2006 05:28.11 CST

  mugg     May 8, 2007 23:52.59 CDT
> adamx:
> I want an IPC sniffer.  The top two forms of IPC I need to intercept and decode are
>
> 2) Window messages (e.g. WM_*)
>
> Does anyone know if something that does this or anything close already exists?  I don\'t want to reinvent the wheel.

For windows messages, Winspector does the trick:
http://www.windows-spy.com/

  jms     May 11, 2007 02:24.45 CDT
Your other option is to write 20-50 lines of pydbg code, set a hook on SendMessage, etc. and have your callback routines merely read the parameters off the stack. Works like a charm for me :)

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