proto_new there cannot be two protocols with the same name

asked 2021-10-19 12:45:20 +0000

rneustad
3 ●1 ●1 ●3

updated 2021-10-19 13:27:01 +0000

grahamb

flag of United Kingdom of Great Britain and Northern Ireland

23790 ●4 ●951 ●227 https://www.wireshark.org

Hi there!

I am using Wireshark Version 3.0.2 .

I created new protocol dissector and get the same error msg: proto_new there cannot be two protocols with the same name.

I tried with:

MQTTPROTO = Proto.new("mqtt_new", "MQ Telemetry Transport New")

and

MQTTPROTO = Proto("mqtt_new", "MQ Telemetry Transport New")

both options throw exception.

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Comments

This works fine for me. Do you have more than one .lua file with the same "mqtt_new" name?

cmaynard ( 2021-10-19 14:21:05 +0000 )edit

Any reason why you try to add a disssector to an old version?

hugo.vanderkooij ( 2021-10-19 14:21:24 +0000 )edit

@cmaynard I have a single file with this name. Maybe Wireshark use cheche somewhere? I reopen the app but no success

rneustad ( 2021-10-19 14:47:23 +0000 )edit

@hugo.vanderkooij I don't understand what do you mean by "add a dissector to an old version". What do you mean? I want that in case of specific code in the packet to process the rest of the packet with costumed MQTT protocol.

if buffer(0,1):uint() == 0x1 then dofile([[path_to_lua_dissector_file]])

What I did wrong?

rneustad ( 2021-10-19 14:49:20 +0000 )edit

You're working with Wireshark 3.0.2, which went EOL last year (See https://gitlab.com/wireshark/wireshar...), so @hugo.vanderkooij is wondering why you're not working with a newer version of Wireshark such as 3.4.9, which is currently the latest stable version of Wireshark.

cmaynard ( 2021-10-19 15:03:25 +0000 )edit

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Ho! That makes sense! so I should I call this file? The line appears in another protocol which works fine! (All the header is processed as expected, but when the it should load the new mqtt protocol there is an error)

rneustad ( 2021-10-19 18:15:57 +0000 )edit

Maybe something like this?

if buffer(0,1):uint() == 0x1 then
    Dissector.get("mqtt_new"):call(tvb, pinfo, tree)
end

cmaynard ( 2021-10-19 18:22:36 +0000 )edit

tvb is just the typical "testy virtual buffer" name. You need to create the actual tvb from your buffer, i.e., the part of the buffer that gets passed to your "mqtt_new" dissector.

cmaynard ( 2021-10-19 18:41:54 +0000 )edit

Thank you very much! It works!!!

rneustad ( 2021-10-19 18:43:18 +0000 )edit

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