I have made a lot of DNS products and doing the same thing happening here is a few lines of code in most any language. This code, while entertaining, cannot handle very simple DNS packets because of its "compression encoding.

This is ran behind PowerDNS, which handles the compression prior to handing off to this code, so that shouldn't be a problem.

Which means it’s not really doing any of the heavy lifting.

Which is also the case for most bash scripts, the heaving lifting is done by all the executables that are called from bash, not in native bash.

Nobody said it couldn't be done, just that it shouldn't. Fun stunt but ultimately suitable only for toys or as a gimmick.

I've developed on consumer grade routers from big vendors - Asus, linksys, netgear etc, and they are all using identical quality scripts for a large majority of the router's data processing. These scripts may not be pristine, but they are sure not always just a toy.