Re: LUA dissector - combine data from 2 UDP packets, display issue

[Michael Poroger <bezenchu () gmail com>]

Hello all,

I've copied the part of the code which is relevant for the packet combining
(attached).

-----------------------------
Michael Poroger

"Science is not only knowledge, science is also to be dare"
Shimon Peres



On Tue, Aug 4, 2020 at 3:39 AM Maynard, Chris via Wireshark-users <
wireshark-users () wireshark org> wrote:

> By the way, in case anyone is interested, attached is the capture file I
> used to test the “Frag Proto” from
> https://osqa-ask.wireshark.org/questions/55621/lua-udp-reassembly.
>
>
>
> - Chris
>
>
>
> *From:* Maynard, Chris
> *Sent:* Monday, August 3, 2020 5:42 PM
> *To:* Community support list for Wireshark <wireshark-users () wireshark org>
> *Subject:* RE: [Wireshark-users] LUA dissector - combine data from 2 UDP
> packets, display issue
>
>
>
> I download the fragproto.lua implementation from the OSQA question and
> tested it against the data provided; it seemed to work fine.  Without
> knowing more details about your own dissector, it’s rather difficult to
> provide more help.  Can you share the basics along with some simple test
> data?
>
>
>
> - Chris
>
>
>
> *From:* Wireshark-users <wireshark-users-bounces () wireshark org> *On
> Behalf Of *Michael Poroger
> *Sent:* Friday, July 31, 2020 12:02 PM
> *To:* Community support list for Wireshark <wireshark-users () wireshark org>
> *Subject:* Re: [Wireshark-users] LUA dissector - combine data from 2 UDP
> packets, display issue
>
>
>
> Something I build by myself. The idea is similar to this
> <https://osqa-ask.wireshark.org/questions/55621/lua-udp-reassembly>
> implementation (in the answer) - just storing the data between packet X-1
> to packet X.
>
>
>
> Not sure about the actual implementation (as already on weekend), but I
> think that this is not persistent storage, as if the data in the packet is
> complete, the storage is set to an empty one. In any case, if packet X-1
> does not contain complete data,  this data is available for packet X.
>
>
>
> -----------------------------
> Michael Poroger
>
> "Science is not only knowledge, science is also to be dare"
> Shimon Peres
>
>
>
>
>
> On Fri, Jul 31, 2020 at 5:27 PM Jeff Morriss <jeff.morriss.ws () gmail com>
> wrote:
>
>
>
>
>
> On Fri, Jul 31, 2020 at 8:58 AM Michael Poroger <bezenchu () gmail com>
> wrote:
>
> Hello users :)
>
> I've successfully created a dissector which combines data from 2 UDP
> packets. Every time I select this kind of packet, I'm getting an error on
> the packet details on the custom protocol section.
>
> Only when I select the previous packet and then the current packet, I can
> see the dissection as I expect and without any error.
>
> How to solve the issue?
>
> Probably a question better for the -dev list but...
>
>
>
> Are you using epan's reassembly routines or something you built yourself?
> If it's something you built yourself, are you storing the reassembled data
> in persistent storage which is available when (re)dissecting the 2nd frame
> (where the reassembled data is used)?
>
>
>
>
>
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>
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Attachment: ex.lua
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