Raw packet relay feature (performance)

[taoeffect]

There are many ways to implement the following (and they should all be explored), but the main idea is that always having to parse and repack every packet creates a DNS library that unnecessarily slow when only a relay is desired.

The goal of this feature is to put as little latency on the receiving and sending of a DNS question/response when the goal is to simply act as a bridge/relay for another DNS server.

[SGrondin]

I've begun working on this.

[taoeffect]

Awesome. 👍

[taoeffect]

@SGrondin, please work off of the okTurtles forks, they have a lot of improvements (especially in native-dns-packet) @tjfontaine said he would review the PRs I sent him (but I'm guessing he just needs to find the time for it):

• https://github.com/okTurtles/node-dns
• https://github.com/okTurtles/native-dns-packet
• And probably not necessary for this issue: https://github.com/okTurtles/native-dns-cache

[SGrondin]

Noted, thanks.