Wireshark-dev: Re: [Wireshark-dev] [GSoC] Packet Editor and Viewer
From: Edwin Abraham <[email protected]>
Date: Sun, 14 Apr 2013 13:15:28 +0530

Last Summer as a part of an internship at DRDO (Defense Research and Development Organisation) I was asked to go through their custom networking protocol. So that they could improve the protocol handling and how the application handled. Since they needed a quick fix and I used LUA scripts to write a custom dissector for them. They were happy with the result. But the in the end I realized they wanted to open the packet edit the data within wireshark, compare it with other protocols they were using.


I agree with the fact there is a Packet Viewer but it’s not editable. But if there is a UI where the packets can be manipulated by applying data changes or designing a dissector with the existing packets. LUA is powerful and if the UI is setup to create the dissector without using an IDE or  at least eventually. If the reboot is given from within the UI we can resume the Packet Editor session when wireshark restarts.


I was thinking the Packet Editor should be able to display the packet data to the user in the mode he desires. Like if the user wants to see the packet in hex, then a specific part in decimal. Or to have the headers applied and not applied on the packet. In the following is a rough idea of what I mean.


Headers

Data 1

Data 2

Data 3

<headername 1>

<data>
<data>
<data>

<headername 1>

<data>
<data>
<data>

<data_payload>

<data>
<data>
<data>

Initially when a packet is opened it is already filtered by the headers IP,UDP,etc. This editor can display the data in a way comfortable to add custom headers (using dissectors) and temporarily apply and see the payload. Once the packet is modified to user requirement, the user can apply listeners to send the required data to the applications to analyse the data.


When I mentioned that the editor can exist on its own I meant the UI can be used wherever in wireshark to view packets like when designing dissectors, applying filter, or any kind of packet manipulation.