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libpcap: 2 concurrent threads acquiring on the same interface
From: Descombes Thierry <descombt () yahoo com>
Date: Thu, 13 Jun 2013 10:31:55 +0100 (BST)


I have developed a small security toolsthatuse the libpcap for metrology purpose. I'd like to add new online capture 
feature, to generate pcap file (from a given BPF filter), without disrupting my metrology tool (nor inducing packets 
So, I'd wish to know the best way to dothe acquisition with both, a BPF filter, and none (=continuously acquiring data 
without filtering).

Generally, is  it possible to call a 2nd applications that also use the libpcap on the same network interface (without 
disruptionor packet loss)? If yes, the solution might be to simply call tcpdump (as a system commandfor example...)

And if not... should I rewrite a BPF decoder&filter and use my current pcap loop ? Is there a easier better way ?

Thank you very much in advance for your response.

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