Adding a build time option #
To add a build-time option, I added MBUF_TRACE opt_global.h to sys/conf/options.
This will add it to opt_global.h, which is created dynamically during compilation and included automatically (using -include compiler option).
The value of this option can then be checked by doing #if defined MBUF_TRACE or #ifdef MBUF_TRACE.
Adding a new source file #
To sys/conf/files I added kern/kern_mbuf_trace.c optional mbuf_trace.
optional mbuf_trace tells the build system to only build this file when option mbuf_trace is enabled.
Wireshark #
On FreeBSD, Wireshark is not compiled with Lua support.
I wanted to make traces into clickable links when they resemble file paths. I want these links to open the file:line in the editor so you can easily track in the source what the packet path was.
I’ve lost 3 hours trying to get Wireshark to play along and failed. I’m convinced it is possible to create it with its module system but the documentation on how to create a dissectors in C that is a plugin is awful. If you have experience with something like this and would like to contribute, please contact me.