Re: still unclear how to build a new ASN.1-based dissector

[Vincent Randal <vtrandal () gmail com>]

CORRECTION:  I omitted the troublesome steps (underlined) when describing
the problem:
git clone https://<wireshark repo> wireshark
cd wireshark
git checkout wireshark-3.4.4
cd wireshark/epan/dissectors

*cp ~/myfoo.tgz . #copy dissector code into wireshark clone*
*tar xvf myfoo.tgz #extract the dissector code (details in previous email)*
cd ../../..
mkdir build
cd build
cmake ../wireshark #this step worked previously but not on a fresh
wireshark clone now
make asn1 #with relevant entries in two CMakeListsCustom files
make

On Sun, Apr 18, 2021 at 8:15 PM Vincent Randal <vtrandal () gmail com> wrote:

> Hello Wireshark-dev community,
>
> Apparently, I still don't have the correct sequence of steps necessary for
> first time generation of "packet-myfoo.c" and "packet-myfoo.h" for a new
> ASN.1-based dissector called myfoo. Details follow.
>
> I would like to understand (much better than I do) how to add an
> ASN.1-based dissector to epan/dissectors/asn1 in a fresh clone of
> wireshark. I got a lot of help from a lot of people last week (for which I
> am grateful) but I must still be missing a step here:
> git clone https://<wireshark repo> wireshark
> cd wireshark
> git checkout wireshark-3.4.4
> cd ..
> mkdir build
> cd build
> cmake ../wireshark #this step worked previously but not on a fresh
> wireshark clone now
> make asn1 #with relevant entries in two CMakeListsCustom files
> make
>
> When I add my dissector folder "myfoo" to epan/dissectors/asn1 here's the
> relevant error messages from cmake (with some highlighting by me):
>
>
>
>
>
>
>
>
>
>
> *-- Configuring doneCMake Error at epan/dissectors/CMakeLists.txt:2004
> (add_library):  Cannot find source file:
> /home/vtrandal/ws1/wireshark/epan/dissectors/packet-myfoo.c  Tried
> extensions .c .C .c++ .cc .cpp .cxx .cu .m .M .mm .h .hh .h++ .hm  .hpp
> .hxx .in .txxCMake Error at epan/dissectors/CMakeLists.txt:2004
> (add_library):  No SOURCES given to target: dissectors*
> [end of cmake error messages]
>
> The point of the above cmake error messages is that the "packet-myfoo.c"
> and "packet-myfoo.h" files have not yet been generated (and I don't know
> how to generate them). I do not know how I got past the cmake step before,
> but I was lucky (and unlucky now). The ASN.1-based dissector code is in the
> attached .tgz file which I extract in epan/dissectors as follows:
> tar xvf myfoo.tgz
> ./CMakeListsCustom.txt <== contains entry for myfoo
> ./asn1/CMakeListsCustom.txt <== contains entry for myfoo
> ./asn1/myfoo/
> ./asn1/myfoo/myfoo.asn
> ./asn1/myfoo/myfoo.cnf
> ./asn1/myfoo/CMakeLists.txt
> ./asn1/myfoo/packet-myfoo-template.h
> ./asn1/myfoo/packet-myfoo-template.c
>
> I apologize in advance for being thick-headed about the process of adding
> a new ASN.1-based dissector to epan/dissectors/asn1 in Wireshark. With help
> from a lot of people I got it to compile previously (again for which I am
> grateful). But I cannot repeat that success starting with a fresh clone of
> wireshark regardless of the branch. Somehow I still don't have the correct
> sequence of steps necessary to generate "packet-myfoo.c" and
> "packet-myfoo.h" the first time. With my dissector code in epan/dissectors
> the cmake step fails and I cannot make  anything.
>
> Vincent
>
> NOTE: The attached dissector code is based on the simple ASN.1-based
> dissector example online.
> https://www.wireshark.org/docs/wsdg_html_chunked/SimpleASN1BasedDissector.html
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