Wireshark · Wireshark-dev: Re: [Wireshark-dev] Feeding the 802.15.4 Dissector

[Rui Pedro Caldeira <rpcaldeira@xxxxxxxxxxx>]

Thank You so much Guy and Tomasz, that was exactly what I was looking for.

Best Regards,

Rui

Cumprimentos,
Rui Pedro Caldeira

On Wed, Jul 31, 2013 at 11:17 AM, Guy Harris <guy@xxxxxxxxxxxx> wrote:

On Jul 31, 2013, at 2:46 AM, Rui Pedro Caldeira <rpcaldeira@xxxxxxxxxxx> wrote:

> Hey Tomasz, thanks for the anwser. But my main question is how to write the bytes into the pipe so that Wireshark recognizes them as IEEE 802.15.4 packets, kinda like a structure that Wireshark is waiting for. I cannot just write the packet into the pipe, Wireshark gives me an error :S

You don't write packets to a pipe on which Wireshark is capturing; you write a byte stream that looks either like a pcap file:

        http://www.tcpdump.org/manpages/pcap-savefile.5.html

or looks like a pcap-ng file:

        http://www.winpcap.org/ntar/draft/PCAP-DumpFileFormat.html

Those types of file *include* packets, but they include more than just packet data.

So:

If you're writing a pcap file, the *first* thing you have to write is a pcap file header, including a "link-layer header type" value corresponding to the 802.15.4 format you're using (see the LINKTYPE_ values in the tcpdump.org page Tomasz mentioned), and then, for each packet, a pcap per-packet header followed by the raw packet data.

If you're writing a pcap-ng file, the *first* thing you have to write is a Section Header Block:

        http://www.winpcap.org/ntar/draft/PCAP-DumpFileFormat.html#sectionshb

followed by an Interface Description Block:

        http://www.winpcap.org/ntar/draft/PCAP-DumpFileFormat.html#sectionidb

including a "LinkType" value corresponding the the 802.15.4 format you're using (see the LINKTYPE_ values in the tcpdump.org page Tomasz mentioned), and then, for each packet, an Enhanced Packet Block:

        http://www.winpcap.org/ntar/draft/PCAP-DumpFileFormat.html#sectionepb

or, if you don't have time stamps for the packets, a Simple Packet Block:

        http://www.winpcap.org/ntar/draft/PCAP-DumpFileFormat.html#sectionpbs

containing the raw packet data.

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