mirror of
https://github.com/tailscale/tailscale.git
synced 2024-12-04 23:45:34 +00:00
bc34788e65
This is a bug introduced in a903d6c2ed
.
Signed-off-by: Dmytro Shynkevych <dmytro@tailscale.com>
89 lines
2.0 KiB
Go
89 lines
2.0 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package tsdns
|
|
|
|
import (
|
|
"github.com/miekg/dns"
|
|
"inet.af/netaddr"
|
|
)
|
|
|
|
// This file exists to isolate the test infrastructure
|
|
// that depends on github.com/miekg/dns
|
|
// from the rest, which only depends on dnsmessage.
|
|
|
|
var dnsHandleFunc = dns.HandleFunc
|
|
|
|
// resolveToIP returns a handler function which responds
|
|
// to queries of type A it receives with an A record containing ipv4,
|
|
// to queries of type AAAA with an AAAA record containing ipv6,
|
|
// to queries of type NS with an NS record containg name.
|
|
func resolveToIP(ipv4, ipv6 netaddr.IP, ns string) dns.HandlerFunc {
|
|
return func(w dns.ResponseWriter, req *dns.Msg) {
|
|
m := new(dns.Msg)
|
|
m.SetReply(req)
|
|
|
|
if len(req.Question) != 1 {
|
|
panic("not a single-question request")
|
|
}
|
|
question := req.Question[0]
|
|
|
|
var ans dns.RR
|
|
switch question.Qtype {
|
|
case dns.TypeA:
|
|
ans = &dns.A{
|
|
Hdr: dns.RR_Header{
|
|
Name: question.Name,
|
|
Rrtype: dns.TypeA,
|
|
Class: dns.ClassINET,
|
|
},
|
|
A: ipv4.IPAddr().IP,
|
|
}
|
|
case dns.TypeAAAA:
|
|
ans = &dns.AAAA{
|
|
Hdr: dns.RR_Header{
|
|
Name: question.Name,
|
|
Rrtype: dns.TypeAAAA,
|
|
Class: dns.ClassINET,
|
|
},
|
|
AAAA: ipv6.IPAddr().IP,
|
|
}
|
|
case dns.TypeNS:
|
|
ans = &dns.NS{
|
|
Hdr: dns.RR_Header{
|
|
Name: question.Name,
|
|
Rrtype: dns.TypeNS,
|
|
Class: dns.ClassINET,
|
|
},
|
|
Ns: ns,
|
|
}
|
|
}
|
|
|
|
m.Answer = append(m.Answer, ans)
|
|
w.WriteMsg(m)
|
|
}
|
|
}
|
|
|
|
func resolveToNXDOMAIN(w dns.ResponseWriter, req *dns.Msg) {
|
|
m := new(dns.Msg)
|
|
m.SetRcode(req, dns.RcodeNameError)
|
|
w.WriteMsg(m)
|
|
}
|
|
|
|
func serveDNS(addr string) (*dns.Server, chan error) {
|
|
server := &dns.Server{Addr: addr, Net: "udp"}
|
|
|
|
waitch := make(chan struct{})
|
|
server.NotifyStartedFunc = func() { close(waitch) }
|
|
|
|
errch := make(chan error, 1)
|
|
go func() {
|
|
errch <- server.ListenAndServe()
|
|
close(errch)
|
|
}()
|
|
|
|
<-waitch
|
|
return server, errch
|
|
}
|