[Winpcap-users] Windows 10 support for WinPcap

Jiyang Hu jiyang_hu at yahoo.com
Fri Feb 5 15:38:08 UTC 2016 

I believe query NDIS for OID_GEN_MEDIA_CONNECT_STATUS is a waste of resource if it is put in a loop. Getting a notification of media state change asynchronously should be better. My 2 cents.

    On Friday, February 5, 2016 9:23 AM, Nuno Antonio Dias Ferreira <nuno.ferreira at efacec.com> wrote:
 

 #yiv5383968201 #yiv5383968201 -- _filtered #yiv5383968201 {font-family:Helvetica;panose-1:2 11 6 4 2 2 2 2 2 4;} _filtered #yiv5383968201 {panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv5383968201 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} _filtered #yiv5383968201 {font-family:Georgia;panose-1:2 4 5 2 5 4 5 2 3 3;} _filtered #yiv5383968201 {panose-1:2 11 5 3 2 0 0 2 0 4;} _filtered #yiv5383968201 {panose-1:2 11 6 4 3 5 4 4 2 4;} _filtered #yiv5383968201 {panose-1:2 11 5 3 2 0 0 2 0 4;} _filtered #yiv5383968201 {panose-1:2 11 6 4 3 5 4 4 2 4;} _filtered #yiv5383968201 {panose-1:2 11 6 3 2 2 2 2 2 4;}#yiv5383968201 #yiv5383968201 p.yiv5383968201MsoNormal, #yiv5383968201 li.yiv5383968201MsoNormal, #yiv5383968201 div.yiv5383968201MsoNormal {margin:0cm;margin-bottom:.0001pt;font-size:12.0pt;}#yiv5383968201 a:link, #yiv5383968201 span.yiv5383968201MsoHyperlink {color:blue;text-decoration:underline;}#yiv5383968201 a:visited, #yiv5383968201 span.yiv5383968201MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv5383968201 span.yiv5383968201EmailStyle17 {color:#1F497D;}#yiv5383968201 span.yiv5383968201EmailStyle18 {color:windowtext;}#yiv5383968201 .yiv5383968201MsoChpDefault {} _filtered #yiv5383968201 {margin:70.85pt 3.0cm 70.85pt 3.0cm;}#yiv5383968201 div.yiv5383968201WordSection1 {}#yiv5383968201 Hi Sven,    I have an application where I am using npcap and I also have the need to detect the media status changes. To do that I query NDIS to get that information: https://msdn.microsoft.com/en-us/library/windows/hardware/ff569604(v=vs.85).aspx    Here is an example: if(IoctlNdisQueryGlobalStats(Iface->IOCTLhandler, OID_GEN_MEDIA_CONNECT_STATUS, &ConnectedState, sizeof(ConnectedState), (PUINT)&ReturnedCount) == ERROR_SUCCESS)      {            return ConnectedState == NdisMediaStateConnected;       }    Hope this information could be helpful.       Melhores Cumprimentos / Best Regards Nuno Antonio Dias Ferreira
Unidade de Automação de Sistemas de Energia / Power System Automation Unit Efacec Energia, Máquinas e Equipamentos Elétricos, S.A.
 Disclaimer    From: winpcap-users-bounces at winpcap.org [mailto:winpcap-users-bounces at winpcap.org]On Behalf Of ?????V5
Sent: 5 de fevereiro de 2016 04:44
To: winpcap-users at winpcap.org
Subject: Re: [Winpcap-users] Windows 10 support for WinPcap          On Fri, Feb 5, 2016 at 3:56 AM, Mark Pizzolato - Winpcap-Users <winpcap-users-20040408 at subscriptions.pizzolato.net> wrote: 
The inverted call model might be useful in an abstract way to get notified of a media state change, however, the question then comes back to how to convey that detail to the application which is using the libpcap APIs.    Since the only APIs that an application which already has a pcap session opened is using are: pcap_next_ex, pcap_dispatch, pcap_loop and possibly pcap_sendpacket   pcap_next_ex, pcap_dispatch and pcap_loop are defined to return -1 on an error.  Is media state change an error?                 Is media offline an error? 
   I prefer to use the phrases in ncpa.cpl. If the adapter disconnects (like Wi-Fi), libpcap API should only report time-out (you don't get any new packets). If the adapter is disabled, libpcap API may report error (or time-out)? I didn't try this. One thing for sure is that you can't get new packets too. This thing should not happen when using Npcap/WinPcap. Because when listing adapters with Npcap/WinPcap, disabled adapters never show up on the list. So Npcap/WinPcap assumes that the adapters it uses is always kept as enabled.   
  pcap_sendpacket is defined to return -1 if a packet wasn’t successfully sent.                 It would seem that returning -1 when the media is offline makes sense 
   This makes sense to me.   
  I don’t know for sure how WinPcap behaves under these conditions, but it seems that it npcap should reliably report errors under the media offline state. Is there a reason it can’t? 
   Npcap actually doesn't report errors any better than WinPcap. There's even a chance that Npcap behaves different on reporting errors with WinPcap. Because Npcap uses NDIS6 and WinPcap uses NDIS5.   
  From:winpcap-users-bounces at winpcap.org [mailto:winpcap-users-bounces at winpcap.org]On Behalf Of Jiyang Hu
Sent: Thursday, February 4, 2016 11:18 AM
To: winpcap-users at winpcap.org
Subject: Re: [Winpcap-users] Windows 10 support for WinPcap   @Sven: you need something called - Inverted Call Model   The Inverted Call Model in KMDF - OSR 
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    On Thursday, February 4, 2016 12:49 PM, Sven Kerschbaum <svkers at gmail.com> wrote:   @Yang: It is not possible to get notifications of media state changes by the API which you proposed in your previous post. It provides only notifications about IP table changes. Am 04.02.2016 16:31 schrieb "Sven Kerschbaum" <svkers at gmail.com>: 
Hi Yang,   thanks for providing me the detailed information about Npcap. I will definitively have a look at it and try it.   Cheers, SK     2016-02-04 13:04 GMT+01:00食肉大灰兔V5 <hsluoyz at gmail.com>: 
Hi Sven,   Npcap (https://github.com/nmap/npcap) has better performance because of NDIS 6. It also has several new features:     I actually didn't add a function about making user software getting notified about media state changes. From my knowledge I don't know there's any support of such a function in libpcap. libpcap is an interface standard followed by WinPcap/Npcap. However, I think you can do it using native Windows APIs (like Receiving Notification of Network Events in https://msdn.microsoft.com/en-us/library/windows/desktop/aa366334(v=vs.85).aspx). And if you have any improvement advice about Npcap, I will consider it:)     Cheers, Yang 

  
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