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Plugin compiling problems

asked 2019-03-12 11:36:44 +0000

jeskudero gravatar image

updated 2019-03-12 21:17:27 +0000

Guy Harris gravatar image


I'm trying to compile the s7comm_plus dissector in ubuntu 18, and i'm having problems to get it work. i gonna try to describe the process that i followed:

1- download wireshark 3.0 source code.

2- put s7comm_plus folder into wireshark3.0/plugins/epan/

3- chage some lines in CMakeLists.txt:

  • Add this 2 lines: "include(WiresharkPlugin)" and "cmake_minimum_required(VERSION 3.10)"
  • Change line: "register_dissector_file" by "register_plugin_files"

4- mkdir build && cd build

5- cmake ../wireshark 3.0

6- make (and here comes the problem). It compiles well all the wireshark files except the dissector.

Traceback (most recent call last): File "/home/josu/Descargas/wireshark-3.0.0/tools/", line 78, in <module> contents =
File "/usr/lib/python3.6/", line 321, in decode (result, consumed) = self._buffer_decode(data, self.errors, final) UnicodeDecodeError: 'utf-8' codec can't decode byte 0xfc in position 1239: invalid start byte
plugins/epan/s7comm_plus/CMakeFiles/s7comm_plus.dir/build.make:62: recipe for target 'plugins/epan/s7comm_plus/plugin.c' failed
make[2]: *** [plugins/epan/s7comm_plus/plugin.c] Error 1 CMakeFiles/Makefile2:13896: recipe for target 'plugins/epan/s7comm_plus/CMakeFiles/s7comm_plus.dir/all' failed
make[1]: *** [plugins/epan/s7comm_plus/CMakeFiles/s7comm_plus.dir/all] Error 2 Makefile:140: recipe for target 'all' failed
make: *** [all] Error 2

Any suggestions? Thanks!

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First you are better of to use the CMakeList.txt from the gryphon plugin as your template. Thenit looks like you may have a non UTF8 character in one of your source files(?)

Anders gravatar imageAnders ( 2019-03-12 12:31:31 +0000 )edit

Also note that the S7 dissector is now built in to Wireshark, so why do you need to add the plugin?

grahamb gravatar imagegrahamb ( 2019-03-12 14:15:43 +0000 )edit

I think that s7comm_plus is a new protocol?

Anders gravatar imageAnders ( 2019-03-12 14:57:37 +0000 )edit

Yes, the s7comm implemented in wireshark is an old one. Siemens has updated the protocol and now is called s7comm_plus.

jeskudero gravatar imagejeskudero ( 2019-03-12 14:59:36 +0000 )edit

We should try to add comm_plus to Wireshark then.

grahamb gravatar imagegrahamb ( 2019-03-12 16:12:58 +0000 )edit

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answered 2019-03-12 13:59:16 +0000

Anders gravatar image

I downloaded the files from and built them out of the box on Windows after putting them in plugins/epan/7comm_plus and adding the directory to CmakeLists.txt

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Ok, so the problems is in my Linux distro. I read a lot about the "UnicodeDecodeError: 'utf-8' codec can't decode byte 0xfc in position xxx" but i cant figure it to work

jeskudero gravatar imagejeskudero ( 2019-03-12 15:01:07 +0000 )edit

Definitely it was my fault, I've downloaded again the files and I've compiled them without problem. Thanks

jeskudero gravatar imagejeskudero ( 2019-03-12 15:12:20 +0000 )edit

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Asked: 2019-03-12 11:36:44 +0000

Seen: 57 times

Last updated: Mar 12