dnsr

Iterative DNS resolver for Go.

The Resolve method on dnsr.Resolver queries DNS for given name and type (A, NS, CNAME, etc.). The resolver caches responses for queries, and liberally (aggressively?) returns DNS records for a given name, not waiting for slow or broken name servers.

This code leans heavily on Miek Gieben’s excellent DNS library, and is currently in production use at Domainr.

Install

go get github.com/domainr/dnsr

Usage

package main

import (
  "fmt"
  "github.com/domainr/dnsr"
)

func main() {
  r := dnsr.NewResolver(dnsr.WithCache(10000))
  for _, rr := range r.Resolve("google.com", "TXT") {
    fmt.Println(rr.String())
  }
}

Or construct with dnsr.NewResolver(dnsr.WithExpiry()) to expire cache entries based on TTL.

Documentation

Development

Run go generate in Go 1.4+ to refresh the root zone hint file. Pull requests welcome.

Copyright

© nb.io, LLC