Re: Add Sigfox support to libpcap

[<jannisohms () aol com>]

Thanks for the quick reply. I am no radio guy so implementing a module for capturing is out of scope for me. 
Such a module could be implemented by another person (I am not the owner of the referenced project).  

A protocol specification can be found here 
https://github.com/Jeija/renard-spec/releases

I would like to specify a Linktype at first.




-----Ursprüngliche Mitteilung-----
Von: Guy Harris <guy () alum mit edu>
An: jannisohms <jannisohms () aol com>
Cc: tcpdump-workers <tcpdump-workers () lists tcpdump org>
Verschickt: Di, 8. Jan. 2019 19:54
Betreff: Re: [tcpdump-workers] Add Sigfox support to libpcap


On Jan 8, 2019, at 9:15 AM, <jannisohms () aol com> <jannisohms () aol com> wrote:


> Currently, I am extending a Sigfox demodulator https://github.com/Jeija/renard-phy.
> I already added a function to export the demodulated frames. During my work, I ran into a problem with the Linktype. 
> Sigfox works directly on layer 2  to avoid misinterpretation of my packets I used one of the user Linktypes 
> (DLT_USER0).  
>
> Would it be possible to reserve a Linktype for Sigfox?
> I took a quick look at libpcap  would there be anything else to do than to add another define to pcap-common.c?


There's "adding a new link-layer header type for pcap and pcapng files" and there's "adding a module to libpcap that 
can capture from a new capture source".

"reserve a Linktype for Sigfox" is the former; "add a libpcap module that controls a software-defined radio, 
demodulates Sigfox signals, and supplies packets to callers, so that any program that uses libpcap, such as tcpdump or 
Wireshark, can directly capture Sigfox packets" is the latter.

If you're talking about the former, it would be possible, but the first step would be to provide a detailed description 
of the packets.  See the second item in the bulleted list at the top of

    http://www.tcpdump.org/linktypes.html

for more details on the process, as well as

    https://github.com/the-tcpdump-group/libpcap/blob/master/doc/DLT_ALLOCATE_HOWTO.md
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