Re: last touches for custom Lua dissector

[Ariel Burbaickij <ariel.burbaickij () gmail com>]

Hello Pascal,
cool, it works. Thank you very much for your fast response. Genuinely
appreciated! Will take a look at the updated(?) dissector now.

Kind Regards
Ariel Burbaickij


On Tue, Nov 30, 2021 at 2:22 PM Pascal Quantin <pascal () wireshark org> wrote:

> Hi Ariel,
>
> Le mar. 30 nov. 2021 à 14:12, Ariel Burbaickij <ariel.burbaickij () gmail com>
> a écrit :
>
> > Hello community,
> > I have written a custom dissector for LTE related protocols and it runs
> > fine but there is one last piece that I would like to add to it. Context is
> > such: there is a wrapper (generic name) protocol and I call LTE dissector
> > in this manner:
> >
> > local myrrc = Dissector.get("lte-rrc.dl.dcch")
> > local rrc_dl_dcch = myrrc:call(buffer(wrapper_protocol.length()):tvb(),
> > pinfo, tree)
> >
> > or this
> >
> > myrrc = Dissector.get("lte-rrc.ul.dcch")
> > local rrc_ul_dcch = myrrc:call(buffer(wrapper_protocol.length()):tvb(),
> > pinfo, tree)
> >
> > and decode works just fine, however in protocol field in Wireshark's GUI
> > I get WRAPPER_PROOTOCOL as the name and I would like to see LTE RRC or
> > something similar in case of S1AP which is called like this:
> >
> >   local sctp_tbl = DissectorTable.get ("sctp.ppi")
> >   local prot_s1ap = sctp_tbl:get_dissector(18)
> >   prot_s1ap:call(wrapper_protocol.length()):tvb(), pinfo, tree)
> >
> > I do get S1AP as a protocol. length of wrapper_protocol is the same in
> > all three cases,
> >
> > So, how can it be achieved foR LTE RRC and eventually NR RRC ?
>
> The lte-rrc.dl.dcch registered dissector historically does not update the
> protocol column. You might want to use lte_rrc.dl_dcch instead, which will
> update the protocol column with LTE RRC DL_DCCH instead. See
> epan/dissectors/packet-lte-rrc.c file for more details.
>
> The NR RRC dissector always updates the info column.
>
> Best regards,
> Pascal.
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