tcpdump mailing list archives
Adding loopback adapter detection for Windows
From: Yang Luo <hsluoyb () gmail com>
Date: Sun, 24 Jan 2016 22:46:02 +0800
Hi list, I am a developer for Npcap, a fork for WinPcap ( https://github.com/nmap/npcap). My libpcap code is still some very old version 1.0 branch 1_0_rel0b (20091008). And I want to update to the latest release. But before that happens, I need to handle some updates of mine to the libpcap folder code by merging it to libpcap. I have implemented a loopback adapter called "Npcap Loopback Adapter" on Windows. It's like lo in linux. I know that libpcap recognizes "lo" by just matching the adapter name with "lo". And I want libpcap to recognize my "Npcap Loopback Adapter". Unfortunately all adapter's names in Windows are random strings, something like \Device\{B4B27BF5-DECC-428F-AE74-C57344D5402B}. So it can't be hard-coded like lo. I have stored this value in registry. Also I have provided a function in Packet.dll module called PacketIsLoopbackAdapter (packet.dll module is the lower layer below libpcap/wpcap). So possible solutions are: 1) Adding registry read code to libpcap, read the name of "Npcap Loopback Adapter" and compare it with the value in the code. 2) Call my provided PacketIsLoopbackAdapter. Unfortunately, as my Npcap is not a official successor of WinPcap. I can't expect anyone can statically compile against my added PacketIsLoopbackAdapter function. Maybe dynamically function load is needed (LoadLibrary and GetProcAddress). 3) .. Currently my way is like 2), except that I directly built libpcap against my new function. My modification is: https://github.com/nmap/npcap/commit/d18318c495578887829fce8cb366770d3b3c7616 I'm not sure which is the best practice to let libpcap recognize my adapter. Any opinions? Thanks! Cheers, Yang _______________________________________________ tcpdump-workers mailing list tcpdump-workers () lists tcpdump org https://lists.sandelman.ca/mailman/listinfo/tcpdump-workers
Current thread:
- Adding loopback adapter detection for Windows Yang Luo (Jan 24)
- Re: Adding loopback adapter detection for Windows Yang Luo (Jan 24)
- Re: Adding loopback adapter detection for Windows Guy Harris (Jan 24)
- Re: Adding loopback adapter detection for Windows Yang Luo (Jan 24)
- Re: Adding loopback adapter detection for Windows Guy Harris (Jan 24)
- Re: Adding loopback adapter detection for Windows Guy Harris (Jan 24)
- Re: Adding loopback adapter detection for Windows Yang Luo (Jan 25)
- Re: Adding loopback adapter detection for Windows Gisle Vanem (Jan 25)
- Message not available
- Re: Adding loopback adapter detection for Windows Gisle Vanem (Jan 25)
- Re: Adding loopback adapter detection for Windows Yang Luo (Jan 25)
- Re: Adding loopback adapter detection for Windows Yang Luo (Jan 24)
- Message not available
- Re: Adding loopback adapter detection for Windows Guy Harris (Jan 25)
- Re: Adding loopback adapter detection for Windows Yang Luo (Jan 25)