[Winpcap-users] Deadlock on pcap_open_live() ?

[Gianluca Varenni]

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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