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96 lines
2.1 KiB
Go
96 lines
2.1 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package tsdns
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import (
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"log"
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"testing"
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"github.com/miekg/dns"
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"inet.af/netaddr"
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)
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// This file exists to isolate the test infrastructure
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// that depends on github.com/miekg/dns
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// from the rest, which only depends on dnsmessage.
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var dnsHandleFunc = dns.HandleFunc
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// resolveToIP returns a handler function which responds
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// to queries of type A it receives with an A record containing ipv4,
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// to queries of type AAAA with an AAAA record containing ipv6,
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// to queries of type NS with an NS record containg name.
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func resolveToIP(ipv4, ipv6 netaddr.IP, ns string) dns.HandlerFunc {
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return func(w dns.ResponseWriter, req *dns.Msg) {
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m := new(dns.Msg)
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m.SetReply(req)
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if len(req.Question) != 1 {
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panic("not a single-question request")
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}
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question := req.Question[0]
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var ans dns.RR
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switch question.Qtype {
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case dns.TypeA:
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ans = &dns.A{
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Hdr: dns.RR_Header{
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Name: question.Name,
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Rrtype: dns.TypeA,
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Class: dns.ClassINET,
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},
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A: ipv4.IPAddr().IP,
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}
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case dns.TypeAAAA:
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ans = &dns.AAAA{
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Hdr: dns.RR_Header{
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Name: question.Name,
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Rrtype: dns.TypeAAAA,
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Class: dns.ClassINET,
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},
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AAAA: ipv6.IPAddr().IP,
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}
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case dns.TypeNS:
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ans = &dns.NS{
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Hdr: dns.RR_Header{
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Name: question.Name,
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Rrtype: dns.TypeNS,
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Class: dns.ClassINET,
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},
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Ns: ns,
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}
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}
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m.Answer = append(m.Answer, ans)
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w.WriteMsg(m)
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}
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}
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func resolveToNXDOMAIN(w dns.ResponseWriter, req *dns.Msg) {
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m := new(dns.Msg)
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m.SetRcode(req, dns.RcodeNameError)
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w.WriteMsg(m)
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}
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func serveDNS(tb testing.TB, addr string) (*dns.Server, chan error) {
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server := &dns.Server{Addr: addr, Net: "udp"}
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waitch := make(chan struct{})
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server.NotifyStartedFunc = func() { close(waitch) }
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errch := make(chan error, 1)
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go func() {
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err := server.ListenAndServe()
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if err != nil {
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log.Printf("ListenAndServe(%q): %v", addr, err)
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}
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errch <- err
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close(errch)
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}()
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<-waitch
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return server, errch
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}
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