[Winpcap-users] Deadlock on pcap_open_live() ?
Dupuit Cyril
cyrildupuit at hotmail.com
Thu Apr 8 14:59:37 PDT 2010
Hello,
There is no problem.
At this time, if my application doesn't work with the Microsoft NetMon
component it is not a problem.
I am using physical interfaces and propose "dialup/VPN adapters" in case
of...
I am logging this bug in the known bugs of my application and waits the
next release of WinPcap.
If you need anything else, don't hesitate to contact me.
Thank you for your support,
Cyril
> Cyril,
>
> sorry for the late reply. I was able to download the zip file and run the
> application within the debugger. It's a deadlock somewhere inside the
> Microsoft NetMon component (the component used to sniff from dialup/VPN
> adapters). I'm looking if there a workaround that you can apply in your
> code, but I'm not too optimistic, at the moment. I'll get back to you as
> soon as possible.
>
> Have a nice day
> GV
>
>
> --------------------------------------------------
> From: "Dupuit Cyril" <cyrildupuit at hotmail.com>
> Sent: Thursday, April 01, 2010 12:49 PM
> To: <winpcap-users at winpcap.org>
> Subject: Re: [Winpcap-users] Deadlock on pcap_open_live() ?
>
>
>> Thank you,
>>
>> The file "TestForWinPcap.7z" is uploaded.
>>
>> Cyril
>>
>> Le 01/04/2010 21:41, Gianluca Varenni a écrit :
>>
>>> --------------------------------------------------
>>> From: "Dupuit Cyril" <cyrildupuit at hotmail.com>
>>> Sent: Thursday, April 01, 2010 12:12 PM
>>> To: <winpcap-users at winpcap.org>
>>> Subject: Re: [Winpcap-users] Deadlock on pcap_open_live() ?
>>>
>>>
>>>
>>>> Hello,
>>>>
>>>> I am sorry, I am unable to send you directly the binary. Each time the
>>>> message is filtered !
>>>>
>>>>
>>> Is it filtered by your mail server? Please upload it to
>>>
>>> ftp://www.winpcap.org/pub/incoming
>>>
>>> The folder is write only, once you have uploaded it you cannot check that
>>> the file has been uploaded correctly.
>>>
>>> Have a nice day
>>> GV
>>>
>>>
>>>
>>>
>>>> If the source code is too complicated, I can try to give you a better
>>>> example (without GTK, i.e directly in command line).
>>>>
>>>> Best regards,
>>>>
>>>> Cyril
>>>>
>>>> Le 01/04/2010 00:16, Gianluca Varenni a écrit :
>>>>
>>>>
>>>>> binary is ok. If it gets blocked, please send it directly to me
>>>>> (gianluca.varenni AT cacetech.com)
>>>>>
>>>>> GV
>>>>>
>>>>> --------------------------------------------------
>>>>> From: "Dupuit Cyril" <cyrildupuit at hotmail.com>
>>>>> Sent: Wednesday, March 31, 2010 3:00 PM
>>>>> To: <winpcap-users at winpcap.org>
>>>>> Subject: Re: [Winpcap-users] Deadlock on pcap_open_live() ?
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>> Yes, I am able to create a small application that is able to show this
>>>>>> issue but I am not sure what you need :
>>>>>> - Source code (a bit ugly...)
>>>>>> - Binary (no, it's filtered, sorry !)
>>>>>>
>>>>>> I give you an archive in 7z file format that contains the source code
>>>>>> but it's impossible to give you the binary file.
>>>>>>
>>>>>> This small application opens a dialog box. You need to select your
>>>>>> interface (the first by default) and click OK.
>>>>>>
>>>>>> The function pcap_open_file() is called in another thread and the
>>>>>> application is locked.
>>>>>>
>>>>>> Hope that can help you.
>>>>>>
>>>>>> If you have some problems to use this simple application (GTK
>>>>>> dependancies, ...) or if the 7z file is filtered, don't hesitate to
>>>>>> contact me.
>>>>>>
>>>>>> Thank you in advance,
>>>>>>
>>>>>> Cyril
>>>>>>
>>>>>>
>>>>>>
>>>>>> Le 31/03/2010 19:22, Gianluca Varenni a écrit :
>>>>>>
>>>>>>
>>>>>>
>>>>>>> I suspect that it's one of the bugs present in Microsoft NetMon, the
>>>>>>> COM
>>>>>>> component that we use under the hoods to sniff from dialup/VPN
>>>>>>> connections.
>>>>>>>
>>>>>>> Are you able to create a small GTK based application showing the
>>>>>>> issue?
>>>>>>> I'd
>>>>>>> like to test it here.
>>>>>>>
>>>>>>> Have a nice day
>>>>>>> GV
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --------------------------------------------------
>>>>>>> From: "Dupuit Cyril" <cyrildupuit at hotmail.com>
>>>>>>> Sent: Wednesday, March 31, 2010 9:58 AM
>>>>>>> To: <winpcap-users at winpcap.org>
>>>>>>> Subject: Re: [Winpcap-users] Deadlock on pcap_open_live() ?
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>> Hello,
>>>>>>>>
>>>>>>>> My application is used to sniff packets from ethernet like
>>>>>>>> Wireshark.
>>>>>>>>
>>>>>>>> I offer a choice to the user which interface to use to capture
>>>>>>>> packets.
>>>>>>>> To do that, I use a specific thread used to compute some statistics
>>>>>>>> to
>>>>>>>> help him to do the best choice (with a GTK based dialog box).
>>>>>>>>
>>>>>>>> Sometimes, my application can send packets in a specific case (like
>>>>>>>> broadcast or multicast).
>>>>>>>>
>>>>>>>> My application don't use directly COM objects but I am not shure
>>>>>>>> that
>>>>>>>> GTK uses or not COM interface.
>>>>>>>>
>>>>>>>> Hope that can help you to better understand my problem,
>>>>>>>>
>>>>>>>> Cyril
>>>>>>>>
>>>>>>>> Le 31/03/2010 17:18, Gianluca Varenni a écrit :
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>> Is your application COM based?
>>>>>>>>>
>>>>>>>>> Have a nice day
>>>>>>>>> GV
>>>>>>>>>
>>>>>>>>> --------------------------------------------------
>>>>>>>>> From: "Dupuit Cyril" <cyrildupuit at hotmail.com>
>>>>>>>>> Sent: Tuesday, March 30, 2010 2:28 PM
>>>>>>>>> To: <winpcap-users at winpcap.org>
>>>>>>>>> Subject: [Winpcap-users] Deadlock on pcap_open_live() ?
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> Hello,
>>>>>>>>>>
>>>>>>>>>> I am developping an application that uses multiple threaded
>>>>>>>>>> environnement on Windows XP.
>>>>>>>>>>
>>>>>>>>>> One of these threads opens a network interface to count the number
>>>>>>>>>> of
>>>>>>>>>> packets per second and compute statistics.
>>>>>>>>>>
>>>>>>>>>> This architecture works fine for a real network interface (ie
>>>>>>>>>> realteck,
>>>>>>>>>> 3 com, ...) but fails with the first interface (Adapter for
>>>>>>>>>> generic
>>>>>>>>>> dialup and VPN capture).
>>>>>>>>>>
>>>>>>>>>> I have made a little change on my code to use the same thread than
>>>>>>>>>> my
>>>>>>>>>> application.
>>>>>>>>>> The result is good. My application works without deadlok.
>>>>>>>>>>
>>>>>>>>>> If I resume :
>>>>>>>>>> - Multithreaded :
>>>>>>>>>> main thread Statistic thread
>>>>>>>>>> -> Do something... ->
>>>>>>>>>> pcap_open_live()
>>>>>>>>>> on the first interface (Adapter for generic dialup and VPN
>>>>>>>>>> capture)
>>>>>>>>>>
>>>>>>>>>> => Result is a deadlock in the pcap_open_live() function. The
>>>>>>>>>> function
>>>>>>>>>> is blocked.
>>>>>>>>>>
>>>>>>>>>> - Single threaded :
>>>>>>>>>> main thread
>>>>>>>>>> -> pcap_open_live() on the first interface.
>>>>>>>>>> => Result is an handle on the file openned (no deadlock
>>>>>>>>>> detected).
>>>>>>>>>>
>>>>>>>>>> I have tried this solution only on WinPcap 4.1.1. I don't know if
>>>>>>>>>> this
>>>>>>>>>> problem appears in another version of WinPcap.
>>>>>>>>>>
>>>>>>>>>> Can you help me ?
>>>>>>>>>>
>>>>>>>>>> Thank you in adavance,
>>>>>>>>>>
>>>>>>>>>> Cyril
>>>>>>>>>>
>>>>>>>>>> _______________________________________________
>>>>>>>>>> Winpcap-users mailing list
>>>>>>>>>> Winpcap-users at winpcap.org
>>>>>>>>>> https://www.winpcap.org/mailman/listinfo/winpcap-users
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>> _______________________________________________
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>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
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>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
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>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>>
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>>>>>>
>>>>>>
>>>>>>
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>>>>>
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