DavidA_2018's profile - activity

Thanks for your answer. That fixed my problem.

Preference not working in Wireshark 4.0 Using Wireshark 4.0.2 on Windows 11. I have a protocol preference defined as:

Thank you.

Hi,

I am running Wireshark 4.0.2 on Windows 11.

I have 3 lua files that constitute our custom dissector. The top level lua file is general.lua which creates a protocol object:

xran_protocol = Proto("xran", "<snip>")

xran_protocol.prefs.c_plane_debug_level = Pref.enum("C-plane debug", 0, "C-plane debug printing level", debug_pref_enum, false)

A lower level lua file accesses that object:

debug_level = xran_protocol.prefs.c_plane_debug_level <--- A

If my lua files are in the global plugin folder:

"C:\Program Files\Wireshark\plugins\4.0"

it works fine. But if I move the lua files to the personal plugin folder:

%APPDATA%\Wireshark\plugins

line A above gives error:

Lua Error: ...rs\<name>\AppData\Roaming\Wireshark\plugins\cplane.lua:333: attempt to index global 'xran_protocol' (a nil value)

Please can you suggest why it works in the global folder but not in the personal folder?

'Attempt to index global (a nil value)' when lua is in APPDATA directory Hi, I am running Wireshark 4.0.2 on Windows 1

Thanks for your answer.

Hi Chris, thanks very much for answering my question. Your reply was very helpful. David.

How to write/capture a pcap file to test dissector? Hi, we have a mature Lua dissector which we need to continue to deve

Thanks, I'll try 127.0.0.1. However, I'm sure I used to be able to set it in CP.

npcap adaptor not showing in Windows > Network Connections Hi, I am running Windows 10 1903 and have installed Wire

Help needed to debug LUA script Hi, I have written a LUA script to dissect a complex UDP packet. I pass the payload to a

Thanks, that solved my problem.

Hi, I wrote a lua dissector about a year ago and have forgotten some of my understanding of how dissectors work. The Ethernet packet I need to dissect has the following structure (simplified):

• TransportHeader (which includes MessageType and PayloadLength fields)
• Message (of type: MessageType and of length: PayloadLength)

I have a top-level 'general.lua' file that parses the TransportHeader and which creates a DissectorTable. The next level dissector (for the specific message type) is invoked by calling:

xran_dissector_table:try(ecpriMessage, buffer(8):tvb(),pinfo,tree)

My problem is that the lower level dissector currently doesn't know the length of Message. (The buffer passed to it contains the message and some padding). I can see two possibilities:

1. Pass PayloadLength to the lower level dissector
2. Limit the buffer passed to the lower level dissector to length PayloadLength

I don't know how to do either of these. Which would be the best solution and how would I do it?

Help needed with DissectorTable Hi, I wrote a lua dissector about a year ago and have forgotten some of my understanding