[Winpcap-users] Deadlock on pcap_open_live() ?

Thu Apr 8 12:07:00 PDT 2010

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
>>>>>>>>>
>>>>>>>>> _______________________________________________
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>>>>>>>>> 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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