A miekg/dns v2 package?

Fri, 15 Jul 2022 11:59:24 +0000

A DNS v2 library exists at https://codeberg.org/miekg/dns. And it’s fucking fast, ~~360K~~ 410K qps with UDP (on arm64) machines.

It:

Still uses Go structs (the naive thing I tested with a 100% binary format was dog slow), so no builder method.
Does the header/rdata split in RRs, with an rdata sub-package that contains the rdata. This solves the CopyWith and CopyWithout alluded below.
EDNS0 pseudo records are now also RRs.
Contains a Data []byte slice in Msg, to do reference wire-format.
Many, many, ease of use functions and sub packages, such as dnstest, dnsutil, dnsconf, etc.

While browsing, I stumbled upon https://pkg.go.dev/golang.org/x/net/dns/dnsmessage#Builder and I can see that is a way quicker way to create a DNS message. This made me think about a miekg/dns.v2 package again and what that should fix. I think it’s indeed better to just retain the wire format at all times as this is faster - although just working with a Go struct is very much a joy. Also begs the question: “Is it really that slow?” (compression on large messages is slow, memory use will def. be higher in current miekg/dns).

Plan on Miek Gieben

A miekg/dns v2 package?