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POFilter a PCAP file from packet ISO/OSI layer
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13988927
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2012-12-21T11:02:57.280
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2012-12-21T12:48:33.623
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2012-12-21T12:29:27.927
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1194426
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text
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I need to split a PCAP file in two different files: the first one should include all (and only) the packets directed to the application layer of the ISO/OSI model, while the second one includes all the other ones. I'm using Scapy to apply the filter: <pre><code>pkts = PcapReader(infile) applayerpkts = (pkt for pkt in pkts if pkt.haslayer(Raw)) lowlayerspkts = (pkt for pkt in pkts if not pkt.haslayer(Raw)) wrpcap(applayerfilename, applayerpkts) wrpcap(lowlayersfilename, lowlayerspkts) </code></pre> using <code>pkt.haslayer(Raw)</code> method, since that layer should be included only on packets directed to the application layer. What's the problem? I've noticed that the sum of <code>applayerfilename</code> + <code>lowlayersfilename</code> (in file size) is different (lower) from the file size of <code>infile</code>. The reported method is also computationally expensive (and I've got a list of PCAP of ~1.5GB each one), since <code>infile</code> is parsed twice. I'd prefer to apply a different filter, parsing one time the input PCAP. I could use the <code>PcapReader</code> class and manually parsing the PCAP, but I don't know how to generate a PCAP to pass to the <code>wrpcap(...)</code> method. Edit: I've also tried with this solution: <pre><code>pkts = PcapReader(infile) app_pkts = [] low_pkts = [] for p in pkts: if p.haslayer(Raw): app_pkts.append(p) else: low_pkts.append(p) wrpcap(applayerfilename, app_pkts) wrpcap(lowlayersfilename, low_pkts) </code></pre> but it doesn't work, since it consumes too much memory because of the size of my input PCAP... Does an <code>append_to_pcap(filename, packet)</code> like function exists (<code>wrpcap(...)</code> function doesn't work as an append)?
Tags
<python><pcap><scapy><application-layer>
Title
Filter a PCAP file from packet ISO/OSI layer
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