[Winpcap-users] Deadlock on pcap_open_live() ?

Thu Apr 1 12:41:38 PDT 2010

--------------------------------------------------
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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