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
An: jannisohms
Cc: tcpdump-workers
Verschickt: Di, 8. Jan. 2019 19:54
Betreff: Re: [tcpdump-workers] Add Sigfox support to libpcap
On Jan 8, 2019, at 9:15 AM, 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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