[Winpcap-users] Debugging a winpcap exception

Gianluca Varenni gianluca.varenni at cacetech.com
Wed Jan 6 12:19:36 PST 2010


--------------------------------------------------
From: "Chris Morgan" <chmorgan at gmail.com>
Sent: Wednesday, January 06, 2010 11:56 AM
To: "Gianluca Varenni" <gianluca.varenni at cacetech.com>
Cc: <winpcap-users at winpcap.org>
Subject: Re: [Winpcap-users] Debugging a winpcap exception

> On Wed, Jan 6, 2010 at 11:31 AM, Gianluca Varenni
> <gianluca.varenni at cacetech.com> wrote:
>>
>>
>> --------------------------------------------------
>> From: "Chris Morgan" <chmorgan at gmail.com>
>> Sent: Monday, January 04, 2010 1:45 PM
>> To: <winpcap-users at winpcap.org>
>> Subject: [Winpcap-users] Debugging a winpcap exception
>>
>>> I'm trying to debug some very odd behavior in a .net application that
>>> pinvokes winpcap to capture network packets. The behavior I see seems
>>> indicative of memory corruption, when I run under the vs debugger all
>>> events seem to stop until I do a 'break all' and continue after
>>> setting breakpoints. Even then things only run for a short while.
>>>
>>> I switched to using windbg and after running I see this exception
>>> which may or may not be the issue. I'm having trouble continuing
>>> because I'm having difficulty building wpcap.dll in debug mode, it
>>> wants packet.lib but after building packet.lib it still won't build.
>>
>> Which configuration of packet.dll did you build? Did you follow the
>> instructions at
>>
>> http://www.winpcap.org/docs/docs_411/html/group__compilation.html
>>
>> Have a nice day
>> GV
>>
>
> I was trying to follow the instructions there. I've been doing
> software development for a long time now and those instructions are
> pretty confusing. It might make sense to have a single solution that
> contains both the packet and wpcap projects and so the targets can be
> synchronized to avoid the problem below. Also putting the solution at
> a parent directory instead of a subdirectory to make it easier to
> find. I can submit patches if there is any interest or not if there is
> a good reason why things are how they are that I'm unaware of.

I've been working on something like that, but nothing is public yet. It's a 
bit of a pain because there is a single flavor for wpcap.dll but several 
flavors of packet.dll (NT4, NT5, NT6) and this makes things quite complex.

>
> I'm building the 'Debug No Netmon' target for the packet solution. The
> 'Debug' target says npptools.lib can't be found.
>

This is not normal. Are you using Visual Studio 2005 SP1 to build?


> Looking at the linker arguments for wpcap the additional linker
> directory is set to '..\..\packetNtx\Dll\Project\Debug\x86' which is
> the output directory for the 'Debug' target of the packet solution.
> Can I just change this to point at the
> '..\..\packetNtx\Dll\Project\Debug No Netmon\x86' directory?

Yes.

Have a nice day
GV

>
> Chris 



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