<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div dir="ltr" id="yui_3_16_0_1_1454686067183_6532"><span id="yui_3_16_0_1_1454686067183_6032" style="font-family: 'times new roman', 'new york', times, serif; font-size: medium; text-indent: 47.20000076293945px;">I believe query NDIS for </span><span id="yui_3_16_0_1_1454686067183_5863" class="" style="font-family: 'times new roman', 'new york', times, serif; font-size: medium; text-indent: 47.20000076293945px;"><font id="yui_3_16_0_1_1454686067183_6095">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.</font></span></div><div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font size="2" face="Arial"> On Friday, February 5, 2016 9:23 AM, Nuno Antonio Dias Ferreira <nuno.ferreira@efacec.com> wrote:<br></font></div> <br><br> <div class="y_msg_container"><div id="yiv5383968201"><style>#yiv5383968201 #yiv5383968201 --
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<div class="yiv5383968201MsoNormal"><span lang="EN-US" style="font-size:11.0pt;">Hi Sven,</span></div>
<div class="yiv5383968201MsoNormal"><span lang="EN-US" style="font-size:11.0pt;"> </span></div>
<div class="yiv5383968201MsoNormal"><span lang="EN-US" style="font-size:11.0pt;">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: <a rel="nofollow" shape="rect" target="_blank" href="https://msdn.microsoft.com/en-us/library/windows/hardware/ff569604(v=vs.85).aspx">
https://msdn.microsoft.com/en-us/library/windows/hardware/ff569604(v=vs.85).aspx</a></span></div>
<div class="yiv5383968201MsoNormal"><span lang="EN-US" style="font-size:11.0pt;"> </span></div>
<div class="yiv5383968201MsoNormal"><span lang="EN-US" style="font-size:11.0pt;">Here is an example:</span></div>
<div class="yiv5383968201MsoNormal" style="text-indent:35.4pt;"><span lang="EN-US" style="font-size:10.0pt;">if</span><span lang="EN-US" style="font-size:10.0pt;">(IoctlNdisQueryGlobalStats(Iface->IOCTLhandler,
OID_GEN_MEDIA_CONNECT_STATUS, &ConnectedState, <span style="color:blue;">sizeof</span>(ConnectedState), (PUINT)&ReturnedCount) == ERROR_SUCCESS)</span></div>
<div class="yiv5383968201MsoNormal" style=""><span lang="EN-US" style="font-size:10.0pt;">
</span><span style="font-size:10.0pt;">{</span></div>
<div class="yiv5383968201MsoNormal" style=""><span style="font-size:10.0pt;">
<span style="color:blue;">return</span> ConnectedState == NdisMediaStateConnected;</span></div>
<div class="yiv5383968201MsoNormal"><span style="font-size:10.0pt;"> }</span></div>
<div class="yiv5383968201MsoNormal"><span style="font-size:10.0pt;"> </span></div>
<div class="yiv5383968201MsoNormal"><span lang="EN-US" style="font-size:11.0pt;">Hope this information could be helpful.</span></div>
<div class="yiv5383968201MsoNormal"><span lang="EN-US" style="font-size:10.0pt;"> </span></div>
<div class="yiv5383968201MsoNormal"><span lang="EN-US" style="font-size:10.0pt;"> </span></div>
<div class="yiv5383968201MsoNormal"><span style="font-size:8.0pt;">Melhores Cumprimentos / Best Regards</span></div>
<div class="yiv5383968201MsoNormal"><span style="font-size:8.0pt;">Nuno Antonio Dias Ferreira<br clear="none">
Unidade de Automação de Sistemas de Energia / Power System Automation Unit</span></div>
<div class="yiv5383968201MsoNormal"><span style="font-size:8.0pt;">Efacec Energia, Máquinas e Equipamentos Elétricos, S.A.<br clear="none">
</span><span style="font-size:11.0pt;"><img id="yiv5383968201Picture_x0020_3" border="0" width="107" height="44" src="cid:EcVGai9fPisXKd7YGTkS" alt="EFA Logo"></span><span style="font-size:8.0pt;"></span></div>
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<div class="yiv5383968201MsoNormal"><span style="font-size:11.0pt;"> </span></div>
<div class="yiv5383968201yqt5349396005" id="yiv5383968201yqt21000"><div class="yiv5383968201MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;">From:</span></b><span lang="EN-US" style="font-size:11.0pt;"> winpcap-users-bounces@winpcap.org [mailto:winpcap-users-bounces@winpcap.org]
<b>On Behalf Of </b>?????V5<br clear="none">
<b>Sent:</b> 5 de fevereiro de 2016 04:44<br clear="none">
<b>To:</b> winpcap-users@winpcap.org<br clear="none">
<b>Subject:</b> Re: [Winpcap-users] Windows 10 support for WinPcap</span></div>
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<div class="yiv5383968201MsoNormal">On Fri, Feb 5, 2016 at 3:56 AM, Mark Pizzolato - Winpcap-Users <<a rel="nofollow" shape="rect" ymailto="mailto:winpcap-users-20040408@subscriptions.pizzolato.net" target="_blank" href="mailto:winpcap-users-20040408@subscriptions.pizzolato.net">winpcap-users-20040408@subscriptions.pizzolato.net</a>> wrote:</div>
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<div class="yiv5383968201MsoNormal" style=""><span lang="EN-US" style="font-size:11.0pt;">The inverted call model might be useful in an abstract way to get notified of a media
</span><span lang="EN-US"></span></div>
<div class="yiv5383968201MsoNormal" style=""><span lang="EN-US" style="font-size:11.0pt;">state change, however, the question then comes back to how to convey that detail
</span><span lang="EN-US"></span></div>
<div class="yiv5383968201MsoNormal" style=""><span lang="EN-US" style="font-size:11.0pt;">to the application which is using the libpcap APIs.
</span><span lang="EN-US"></span></div>
<div class="yiv5383968201MsoNormal" style=""><span lang="EN-US" style="font-size:11.0pt;"> </span><span lang="EN-US"></span></div>
<div class="yiv5383968201MsoNormal" style=""><span lang="EN-US" style="font-size:11.0pt;">Since the only APIs that an application which already has a pcap session opened
</span><span lang="EN-US"></span></div>
<div class="yiv5383968201MsoNormal" style=""><span lang="EN-US" style="font-size:11.0pt;">is using are: pcap_next_ex, pcap_dispatch, pcap_loop and possibly
</span><span lang="EN-US"></span></div>
<div class="yiv5383968201MsoNormal" style=""><span lang="EN-US" style="font-size:11.0pt;">pcap_sendpacket</span><span lang="EN-US"></span></div>
<div class="yiv5383968201MsoNormal" style=""><span lang="EN-US" style="font-size:11.0pt;"> </span><span lang="EN-US"></span></div>
<div class="yiv5383968201MsoNormal" style=""><span lang="EN-US" style="font-size:11.0pt;">pcap_next_ex, pcap_dispatch and pcap_loop are defined to return -1 on an error.
</span><span lang="EN-US"></span></div>
<div class="yiv5383968201MsoNormal" style=""><span lang="EN-US" style="font-size:11.0pt;">Is media state change an error?</span><span lang="EN-US"></span></div>
<div class="yiv5383968201MsoNormal" style=""><span lang="EN-US" style="font-size:11.0pt;"> Is media offline an error?</span><span lang="EN-US"></span></div>
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<div class="yiv5383968201MsoNormal">I prefer to use the phrases in ncpa.cpl.</div>
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<div class="yiv5383968201MsoNormal">If the adapter disconnects (like Wi-Fi), libpcap API should only report time-out (you don't get any new packets).</div>
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<div>
<div class="yiv5383968201MsoNormal">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.</div>
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<div class="yiv5383968201MsoNormal" style=""><span lang="EN-US" style="font-size:11.0pt;"> </span><span lang="EN-US"></span></div>
<div class="yiv5383968201MsoNormal" style=""><span lang="EN-US" style="font-size:11.0pt;">pcap_sendpacket is defined to return -1 if a packet wasn’t successfully sent.</span><span lang="EN-US"></span></div>
<div class="yiv5383968201MsoNormal" style=""><span lang="EN-US" style="font-size:11.0pt;"> It would seem that returning -1 when the media is offline makes sense</span><span lang="EN-US"></span></div>
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<div class="yiv5383968201MsoNormal">This makes sense to me.</div>
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<div class="yiv5383968201MsoNormal" style=""><span lang="EN-US" style="font-size:11.0pt;"> </span><span lang="EN-US"></span></div>
<div class="yiv5383968201MsoNormal" style=""><span lang="EN-US" style="font-size:11.0pt;">I don’t know for sure how WinPcap behaves under these conditions, but it
</span><span lang="EN-US"></span></div>
<div class="yiv5383968201MsoNormal" style=""><span lang="EN-US" style="font-size:11.0pt;">seems that it npcap should reliably report errors under the media offline state.</span><span lang="EN-US"></span></div>
<div class="yiv5383968201MsoNormal" style=""><span lang="EN-US" style="font-size:11.0pt;">Is there a reason it can’t?</span><span lang="EN-US"></span></div>
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<div class="yiv5383968201MsoNormal">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.</div>
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<div class="yiv5383968201MsoNormal" style=""><a rel="nofollow" shape="rect" href=""><span lang="EN-US" style="font-size:11.0pt;"> </span></a><span lang="EN-US"></span></div>
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<div class="yiv5383968201MsoNormal" style=""><b><span lang="EN-US" style="font-size:11.0pt;">From:</span></b><span lang="EN-US" style="font-size:11.0pt;">
<a rel="nofollow" shape="rect" ymailto="mailto:winpcap-users-bounces@winpcap.org" target="_blank" href="mailto:winpcap-users-bounces@winpcap.org">winpcap-users-bounces@winpcap.org</a> [mailto:<a rel="nofollow" shape="rect" ymailto="mailto:winpcap-users-bounces@winpcap.org" target="_blank" href="mailto:winpcap-users-bounces@winpcap.org">winpcap-users-bounces@winpcap.org</a>]
<b>On Behalf Of </b>Jiyang Hu<br clear="none">
<b>Sent:</b> Thursday, February 4, 2016 11:18 AM<br clear="none">
<b>To:</b> <a rel="nofollow" shape="rect" ymailto="mailto:winpcap-users@winpcap.org" target="_blank" href="mailto:winpcap-users@winpcap.org">winpcap-users@winpcap.org</a><br clear="none">
<b>Subject:</b> Re: [Winpcap-users] Windows 10 support for WinPcap</span><span lang="EN-US"></span></div>
</div>
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<span lang="EN-US" style="">@Sven: you need something called - Inverted Call Model</span><span lang="EN-US"></span></div>
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<span lang="EN-US" style=""> </span><span lang="EN-US"></span></div>
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<span lang="EN-US" style=""><a rel="nofollow" shape="rect" target="_blank" href="https://www.osr.com/nt-insider/2013-issue1/inverted-call-model-kmdf/">The Inverted Call Model in KMDF - OSR</a></span><span lang="EN-US"></span></div>
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<span style=""><a rel="nofollow" shape="rect" target="_blank" href="https://www.osr.com/nt-insider/2013-issue1/inverted-call-model-kmdf/"><span style="font-size:13.5pt;color:black;text-decoration:none;">The Inverted Call Model in KMDF - OSR</span></a></span></div>
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<span style="font-size:10.0pt;">One of the most common questions we see from students, clients, and new Windows driver Read more</span></div>
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<span lang="EN-US" style="font-size:10.0pt;">On Thursday, February 4, 2016 12:49 PM, Sven Kerschbaum <<a rel="nofollow" shape="rect" ymailto="mailto:svkers@gmail.com" target="_blank" href="mailto:svkers@gmail.com">svkers@gmail.com</a>> wrote:</span><span lang="EN-US"></span></div>
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<span lang="EN-US" style="">@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.</span><span lang="EN-US"></span></div>
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<span lang="EN-US" style="">Am 04.02.2016 16:31 schrieb "Sven Kerschbaum" <<a rel="nofollow" shape="rect" ymailto="mailto:svkers@gmail.com" target="_blank" href="mailto:svkers@gmail.com">svkers@gmail.com</a>>:</span><span lang="EN-US"></span></div>
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<span lang="EN-US" style="">Hi Yang,</span><span lang="EN-US"></span></div>
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<span lang="EN-US" style=""> </span><span lang="EN-US"></span></div>
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<span lang="EN-US" style="">thanks for providing me the detailed information about Npcap. I will definitively have a look at it and try it.</span><span lang="EN-US"></span></div>
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<span lang="EN-US" style="">Cheers,</span><span lang="EN-US"></span></div>
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<span lang="EN-US" style="">SK</span><span lang="EN-US"></span></div>
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<span lang="EN-US" style="">2016-02-04 13:04 GMT+01:00
</span><span style="">食肉大灰</span><span style="">兔</span><span lang="EN-US" style="">V5 <<a rel="nofollow" shape="rect" ymailto="mailto:hsluoyz@gmail.com" target="_blank" href="mailto:hsluoyz@gmail.com">hsluoyz@gmail.com</a>>:</span><span lang="EN-US"></span></div>
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<span lang="EN-US" style="">Hi Sven,</span><span lang="EN-US"></span></div>
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<span lang="EN-US" style=""> </span><span lang="EN-US"></span></div>
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<span lang="EN-US" style="">Npcap (<a rel="nofollow" shape="rect" target="_blank" href="https://github.com/nmap/npcap">https://github.com/nmap/npcap</a>) has better performance because of NDIS 6. It also has several new features:</span><span lang="EN-US"></span></div>
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<span lang="EN-US" style=""> </span><span lang="EN-US"></span></div>
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<span lang="EN-US" style="">I actually didn't add a function about making user software </span><span lang="EN-US" style="font-size:9.5pt;">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 <a rel="nofollow" shape="rect" target="_blank" href="https://msdn.microsoft.com/en-us/library/windows/desktop/aa366334(v=vs.85).aspx">https://msdn.microsoft.com/en-us/library/windows/desktop/aa366334(v=vs.85).aspx</a>). And if you have any improvement advice about Npcap, I will consider
it:)</span><span lang="EN-US"></span></div>
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<span lang="EN-US" style="font-size:9.5pt;">Cheers,</span><span lang="EN-US"></span></div>
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<span lang="EN-US" style="font-size:9.5pt;">Yang</span><span lang="EN-US"></span></div>
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