I'm a little confused by your question.
There's dwa_local_planner, the well-known planner that is part of the
core nav stack.
There's also dwb_local_planner, which I introduced at ROSCon this year
that most directly uses the nav_core2 interfaces.
There is no DWAB local planner.
I'm guessing you meant dwb_local_planner, which the code is available
for here:
https://github.com/locusrobotics/robot_navigation
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