tree 980731df4a124623e3785b05be5d61d00e063462
parent 75ea9f40ade3ff29fbe3dfca6d93b62e6959ef2b
author Jan Schär <jan@monogon.tech> 1722266538 +0200
committer Jan Schär <jan@monogon.tech> 1724238601 +0000

osbase/net/dns/kubernetes: add Kubernetes DNS handler

This adds a DNS server handler for Kubernetes DNS service discovery. It
is partially based on the CoreDNS Kubernetes plugin. The query handler
however is written completely from scratch. The handler in the CoreDNS
plugin is very weird; it first handles each query type separately, and
generates msg.Service objects which then need to be converted to dns
records. The new implementation is much simpler, and also more correct:
It handles ANY queries, and follows the rules for NXDOMAIN (If a name is
NXDOMAIN for one qtype, it is NXDOMAIN for all qtypes, and subdomains of
the name are also NXDOMAIN.)

Change-Id: Id1d498ca5384a3b047587ed73e95e4871d82d499
Reviewed-on: https://review.monogon.dev/c/monogon/+/3259
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
Tested-by: Jenkins CI