Wireshark mailing list archives
Re: still unclear how to build a new ASN.1-based dissector
From: Anders Broman via Wireshark-dev <wireshark-dev () wireshark org>
Date: Mon, 19 Apr 2021 06:52:20 +0000
Hi, Perhaps a misconception here, the generated files are part of the source tree currently so when you change any of the files in the ../asn1/foo directory you need to run make foo and check in the generated .c and optionally .h file. So on the very first round add the directory and files in the /foo directory DO NOT change cmake for the generated files yet Run cmake to have the cmake files generated needed to generate asn1 dissectors. Run make foo You should now have generated .c and possibly .h files in your src dir Check them in and update the cmake files to include the f´generated .c .h files Run make to have them built Best regards Anders From: Wireshark-dev <wireshark-dev-bounces () wireshark org> On Behalf Of Vincent Randal Sent: den 19 april 2021 05:06 To: Developer support list for Wireshark <wireshark-dev () wireshark org> Subject: Re: [Wireshark-dev] still unclear how to build a new ASN.1-based dissector CORRECTION: I omitted the troublesome steps (underlined) when describing the problem: git clone https:// <https://%3cwireshark> <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 <mailto: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:// <https://%3cwireshark> <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 done CMake 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 .txx CMake 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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Current thread:
- still unclear how to build a new ASN.1-based dissector Vincent Randal (Apr 18)
- Re: still unclear how to build a new ASN.1-based dissector Vincent Randal (Apr 18)
- Re: still unclear how to build a new ASN.1-based dissector Anders Broman via Wireshark-dev (Apr 18)
- Re: still unclear how to build a new ASN.1-based dissector Vincent Randal (Apr 20)
- Re: still unclear how to build a new ASN.1-based dissector Vincent Randal (Apr 20)
- Re: still unclear how to build a new ASN.1-based dissector Anders Broman via Wireshark-dev (Apr 18)
- Re: still unclear how to build a new ASN.1-based dissector Vincent Randal (Apr 18)