Wireshark · Wireshark-dev: Re: [Wireshark-dev] How to build the simple ASN.1 UDP-based dissector example (foo)

[Vincent Randal <vtrandal@xxxxxxxxx>]

Correct insofar as there are no generated files associated with asn1/foo directory. Namely, packet-foo.c and packet-foo.h did not get generated. But maybe that's not definitive proof that asn1/foo dissector did not get built. How else can I confirm the dissector was or was not built? Open Wireshark and attempt to apply "foo" as a display filter? It's not there.

On Tue, Apr 13, 2021 at 8:10 AM Anders Broman via Wireshark-dev <wireshark-dev@xxxxxxxxxxxxx> wrote:

Hi,

So you are saying that if you create foo dir like

epan/dissectors/asn1/foo/

Rename and update the custom cmake file to

set(CUSTOM_ASN1_SRC_DIR

                           foo

)

And place your source file and cmake.txt in the foo dir then rerun the cmake process

Nothing happens?

Try to delete the build dir  before rerunning cmake again?

I’m not sure on linux if the generate cmake file ends up under the build dir or in the source dir.

 

Regards

Anders

From: Wireshark-dev <wireshark-dev-bounces@xxxxxxxxxxxxx> On Behalf Of Vincent Randal
Sent: den 13 april 2021 15:32
To: Developer support list for Wireshark <wireshark-dev@xxxxxxxxxxxxx>
Subject: Re: [Wireshark-dev] How to build the simple ASN.1 UDP-based dissector example (foo)

 

I tried renaming ./epan/dissectors/asn1/CMakeListsCustom.txt.example to CMakeListsCustom.txt with an entry as follows:

# Add a list of your custom asn1 dissectors here
set(CUSTOM_ASN1_SRC_DIR
   foo
)

 

Again, the build did not update any targets even with that change. But this is progress because that underscores the Step by Step instructions need to be updated to something that works. Any more ideas?

 

On Tue, Apr 13, 2021 at 7:12 AM John Thacker <johnthacker@xxxxxxxxx> wrote:

On Tue, Apr 13, 2021, 8:32 AM Vincent Randal <vtrandal@xxxxxxxxx> wrote:

Hello everyone,

 

I need help building the simple ASN.1 UDP-based dissector example (foo); specifically, I need help building the generate_dissector-*proto* target (Step #6 below). I'm certainly missing something here.

 

 

(c) I created directory "foo" by extracting the attachment (foo.tgz) in epan/dissectors/asn1/

(d) There is a CMakeListsCustom.txt.example file in epan/dissectors/asn1 which already contains an entry for "foo".

(e) Since I don't know what to do in Step #6, I build Wireshare (using cmake), but no build targets get updated.

 

If the solution to this problem belongs in the Wireshark documentation, I would be glad to help update the documentation. Namely, I don't understand the usage of the 5 (five) CMakeListsCustom.txt.example files inWireshark source code.

 

The CMakeListsCustom.txt.example files are just that, examples. You need to copy or rename them to CMakeListsCustom.txt (without the .example) for them to have any effect (and edit them appropriately to add the dissector name to the list, not commented out.)

 

CMake is configured to look for the files by that name.

 

John Thacker

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