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804 lines
21 KiB
Go
804 lines
21 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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"bytes"
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"errors"
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"net"
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"sync"
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"testing"
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dns "golang.org/x/net/dns/dnsmessage"
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"inet.af/netaddr"
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"tailscale.com/tstest"
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)
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var testipv4 = netaddr.IPv4(1, 2, 3, 4)
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var testipv6 = netaddr.IPv6Raw([16]byte{
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0x00, 0x01, 0x02, 0x03,
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0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b,
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0x0c, 0x0d, 0x0e, 0x0f,
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})
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var dnsMap = NewMap(
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map[string]netaddr.IP{
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"test1.ipn.dev.": testipv4,
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"test2.ipn.dev.": testipv6,
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},
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[]string{"ipn.dev."},
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)
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func dnspacket(domain string, tp dns.Type) []byte {
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var dnsHeader dns.Header
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question := dns.Question{
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Name: dns.MustNewName(domain),
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Type: tp,
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Class: dns.ClassINET,
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}
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builder := dns.NewBuilder(nil, dnsHeader)
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builder.StartQuestions()
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builder.Question(question)
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payload, _ := builder.Finish()
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return payload
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}
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type dnsResponse struct {
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ip netaddr.IP
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name string
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rcode dns.RCode
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}
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func unpackResponse(payload []byte) (dnsResponse, error) {
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var response dnsResponse
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var parser dns.Parser
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h, err := parser.Start(payload)
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if err != nil {
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return response, err
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}
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if !h.Response {
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return response, errors.New("not a response")
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}
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response.rcode = h.RCode
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if response.rcode != dns.RCodeSuccess {
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return response, nil
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}
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err = parser.SkipAllQuestions()
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if err != nil {
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return response, err
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}
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ah, err := parser.AnswerHeader()
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if err != nil {
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return response, err
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}
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switch ah.Type {
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case dns.TypeA:
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res, err := parser.AResource()
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if err != nil {
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return response, err
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}
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response.ip = netaddr.IPv4(res.A[0], res.A[1], res.A[2], res.A[3])
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case dns.TypeAAAA:
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res, err := parser.AAAAResource()
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if err != nil {
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return response, err
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}
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response.ip = netaddr.IPv6Raw(res.AAAA)
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case dns.TypeNS:
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res, err := parser.NSResource()
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if err != nil {
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return response, err
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}
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response.name = res.NS.String()
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default:
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return response, errors.New("type not in {A, AAAA, NS}")
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}
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return response, nil
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}
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func syncRespond(r *Resolver, query []byte) ([]byte, error) {
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request := Packet{Payload: query}
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r.EnqueueRequest(request)
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resp, err := r.NextResponse()
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return resp.Payload, err
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}
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func mustIP(str string) netaddr.IP {
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ip, err := netaddr.ParseIP(str)
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if err != nil {
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panic(err)
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}
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return ip
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}
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func TestRDNSNameToIPv4(t *testing.T) {
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tests := []struct {
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name string
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input string
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wantIP netaddr.IP
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wantOK bool
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}{
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{"valid", "4.123.24.1.in-addr.arpa.", netaddr.IPv4(1, 24, 123, 4), true},
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{"double_dot", "1..2.3.in-addr.arpa.", netaddr.IP{}, false},
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{"overflow", "1.256.3.4.in-addr.arpa.", netaddr.IP{}, false},
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{"not_ip", "sub.do.ma.in.in-addr.arpa.", netaddr.IP{}, false},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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ip, ok := rdnsNameToIPv4(tt.input)
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if ok != tt.wantOK {
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t.Errorf("ok = %v; want %v", ok, tt.wantOK)
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} else if ok && ip != tt.wantIP {
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t.Errorf("ip = %v; want %v", ip, tt.wantIP)
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}
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})
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}
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}
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func TestRDNSNameToIPv6(t *testing.T) {
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tests := []struct {
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name string
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input string
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wantIP netaddr.IP
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wantOK bool
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}{
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{
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"valid",
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"b.a.9.8.7.6.5.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa.",
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mustIP("2001:db8::567:89ab"),
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true,
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},
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{
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"double_dot",
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"b..9.8.7.6.5.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa.",
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netaddr.IP{},
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false,
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},
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{
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"double_hex",
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"b.a.98.0.7.6.5.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa.",
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netaddr.IP{},
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false,
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},
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{
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"not_hex",
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"b.a.g.0.7.6.5.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa.",
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netaddr.IP{},
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false,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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ip, ok := rdnsNameToIPv6(tt.input)
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if ok != tt.wantOK {
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t.Errorf("ok = %v; want %v", ok, tt.wantOK)
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} else if ok && ip != tt.wantIP {
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t.Errorf("ip = %v; want %v", ip, tt.wantIP)
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}
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})
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}
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}
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func TestResolve(t *testing.T) {
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r := NewResolver(ResolverConfig{Logf: t.Logf, Forward: false})
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r.SetMap(dnsMap)
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if err := r.Start(); err != nil {
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t.Fatalf("start: %v", err)
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}
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defer r.Close()
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tests := []struct {
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name string
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qname string
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qtype dns.Type
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ip netaddr.IP
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code dns.RCode
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}{
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{"ipv4", "test1.ipn.dev.", dns.TypeA, testipv4, dns.RCodeSuccess},
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{"ipv6", "test2.ipn.dev.", dns.TypeAAAA, testipv6, dns.RCodeSuccess},
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{"no-ipv6", "test1.ipn.dev.", dns.TypeAAAA, netaddr.IP{}, dns.RCodeSuccess},
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{"nxdomain", "test3.ipn.dev.", dns.TypeA, netaddr.IP{}, dns.RCodeNameError},
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{"foreign domain", "google.com.", dns.TypeA, netaddr.IP{}, dns.RCodeRefused},
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{"all", "test1.ipn.dev.", dns.TypeA, testipv4, dns.RCodeSuccess},
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{"mx-ipv4", "test1.ipn.dev.", dns.TypeMX, netaddr.IP{}, dns.RCodeSuccess},
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{"mx-ipv6", "test2.ipn.dev.", dns.TypeMX, netaddr.IP{}, dns.RCodeSuccess},
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{"mx-nxdomain", "test3.ipn.dev.", dns.TypeMX, netaddr.IP{}, dns.RCodeNameError},
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{"ns-nxdomain", "test3.ipn.dev.", dns.TypeNS, netaddr.IP{}, dns.RCodeNameError},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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ip, code, err := r.Resolve(tt.qname, tt.qtype)
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if err != nil {
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t.Errorf("err = %v; want nil", err)
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}
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if code != tt.code {
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t.Errorf("code = %v; want %v", code, tt.code)
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}
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// Only check ip for non-err
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if ip != tt.ip {
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t.Errorf("ip = %v; want %v", ip, tt.ip)
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}
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})
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}
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}
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func TestResolveReverse(t *testing.T) {
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r := NewResolver(ResolverConfig{Logf: t.Logf, Forward: false})
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r.SetMap(dnsMap)
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if err := r.Start(); err != nil {
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t.Fatalf("start: %v", err)
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}
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defer r.Close()
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tests := []struct {
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name string
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ip netaddr.IP
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want string
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code dns.RCode
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}{
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{"ipv4", testipv4, "test1.ipn.dev.", dns.RCodeSuccess},
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{"ipv6", testipv6, "test2.ipn.dev.", dns.RCodeSuccess},
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{"nxdomain", netaddr.IPv4(4, 3, 2, 1), "", dns.RCodeNameError},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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name, code, err := r.ResolveReverse(tt.ip)
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if err != nil {
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t.Errorf("err = %v; want nil", err)
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}
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if code != tt.code {
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t.Errorf("code = %v; want %v", code, tt.code)
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}
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if name != tt.want {
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t.Errorf("ip = %v; want %v", name, tt.want)
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}
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})
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}
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}
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func TestDelegate(t *testing.T) {
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rc := tstest.NewResourceCheck()
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defer rc.Assert(t)
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dnsHandleFunc("test.site.", resolveToIP(testipv4, testipv6, "dns.test.site."))
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dnsHandleFunc("nxdomain.site.", resolveToNXDOMAIN)
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v4server, v4errch := serveDNS("127.0.0.1:0")
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v6server, v6errch := serveDNS("[::1]:0")
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defer func() {
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if err := <-v4errch; err != nil {
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t.Errorf("v4 server error: %v", err)
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}
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if err := <-v6errch; err != nil {
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t.Errorf("v6 server error: %v", err)
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}
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}()
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if v4server != nil {
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defer v4server.Shutdown()
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}
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if v6server != nil {
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defer v6server.Shutdown()
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}
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if v4server == nil || v6server == nil {
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// There is an error in at least one of the channels
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// and we cannot proceed; return to see it.
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return
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}
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r := NewResolver(ResolverConfig{Logf: t.Logf, Forward: true})
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r.SetMap(dnsMap)
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r.SetUpstreams([]net.Addr{
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v4server.PacketConn.LocalAddr(),
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v6server.PacketConn.LocalAddr(),
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})
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if err := r.Start(); err != nil {
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t.Fatalf("start: %v", err)
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}
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defer r.Close()
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tests := []struct {
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title string
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query []byte
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response dnsResponse
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}{
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{
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"ipv4",
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dnspacket("test.site.", dns.TypeA),
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dnsResponse{ip: testipv4, rcode: dns.RCodeSuccess},
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},
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{
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"ipv6",
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dnspacket("test.site.", dns.TypeAAAA),
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dnsResponse{ip: testipv6, rcode: dns.RCodeSuccess},
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},
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{
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"ns",
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dnspacket("test.site.", dns.TypeNS),
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dnsResponse{name: "dns.test.site.", rcode: dns.RCodeSuccess},
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},
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{
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"nxdomain",
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dnspacket("nxdomain.site.", dns.TypeA),
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dnsResponse{rcode: dns.RCodeNameError},
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},
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}
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for _, tt := range tests {
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t.Run(tt.title, func(t *testing.T) {
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payload, err := syncRespond(r, tt.query)
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if err != nil {
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t.Errorf("err = %v; want nil", err)
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return
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}
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response, err := unpackResponse(payload)
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if err != nil {
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t.Errorf("extract: err = %v; want nil (in %x)", err, payload)
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return
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}
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if response.rcode != tt.response.rcode {
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t.Errorf("rcode = %v; want %v", response.rcode, tt.response.rcode)
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}
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if response.ip != tt.response.ip {
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t.Errorf("ip = %v; want %v", response.ip, tt.response.ip)
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}
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if response.name != tt.response.name {
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t.Errorf("name = %v; want %v", response.name, tt.response.name)
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}
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})
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}
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}
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func TestDelegateCollision(t *testing.T) {
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dnsHandleFunc("test.site.", resolveToIP(testipv4, testipv6, "dns.test.site."))
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server, errch := serveDNS("127.0.0.1:0")
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defer func() {
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if err := <-errch; err != nil {
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t.Errorf("server error: %v", err)
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}
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}()
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if server == nil {
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return
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}
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defer server.Shutdown()
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r := NewResolver(ResolverConfig{Logf: t.Logf, Forward: true})
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r.SetMap(dnsMap)
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r.SetUpstreams([]net.Addr{server.PacketConn.LocalAddr()})
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if err := r.Start(); err != nil {
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t.Fatalf("start: %v", err)
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}
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defer r.Close()
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packets := []struct {
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qname string
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qtype dns.Type
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addr netaddr.IPPort
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}{
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{"test.site.", dns.TypeA, netaddr.IPPort{IP: netaddr.IPv4(1, 1, 1, 1), Port: 1001}},
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{"test.site.", dns.TypeAAAA, netaddr.IPPort{IP: netaddr.IPv4(1, 1, 1, 1), Port: 1002}},
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}
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// packets will have the same dns txid.
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for _, p := range packets {
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payload := dnspacket(p.qname, p.qtype)
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req := Packet{Payload: payload, Addr: p.addr}
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err := r.EnqueueRequest(req)
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if err != nil {
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t.Error(err)
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}
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}
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// Despite the txid collision, the answer(s) should still match the query.
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resp, err := r.NextResponse()
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if err != nil {
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t.Error(err)
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}
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var p dns.Parser
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_, err = p.Start(resp.Payload)
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if err != nil {
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t.Error(err)
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}
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err = p.SkipAllQuestions()
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if err != nil {
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t.Error(err)
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}
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ans, err := p.AllAnswers()
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if err != nil {
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t.Error(err)
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}
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var wantType dns.Type
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switch ans[0].Body.(type) {
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case *dns.AResource:
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wantType = dns.TypeA
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case *dns.AAAAResource:
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wantType = dns.TypeAAAA
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default:
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t.Errorf("unexpected answer type: %T", ans[0].Body)
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}
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for _, p := range packets {
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if p.qtype == wantType && p.addr != resp.Addr {
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t.Errorf("addr = %v; want %v", resp.Addr, p.addr)
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}
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}
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}
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func TestConcurrentSetMap(t *testing.T) {
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r := NewResolver(ResolverConfig{Logf: t.Logf, Forward: false})
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if err := r.Start(); err != nil {
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t.Fatalf("start: %v", err)
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}
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defer r.Close()
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// This is purely to ensure that Resolve does not race with SetMap.
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var wg sync.WaitGroup
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wg.Add(2)
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go func() {
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defer wg.Done()
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r.SetMap(dnsMap)
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}()
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go func() {
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defer wg.Done()
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r.Resolve("test1.ipn.dev", dns.TypeA)
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}()
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wg.Wait()
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}
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func TestConcurrentSetUpstreams(t *testing.T) {
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dnsHandleFunc("test.site.", resolveToIP(testipv4, testipv6, "dns.test.site."))
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server, errch := serveDNS("127.0.0.1:0")
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defer func() {
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if err := <-errch; err != nil {
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t.Errorf("server error: %v", err)
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}
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}()
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if server == nil {
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return
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}
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defer server.Shutdown()
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r := NewResolver(ResolverConfig{Logf: t.Logf, Forward: true})
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r.SetMap(dnsMap)
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if err := r.Start(); err != nil {
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t.Fatalf("start: %v", err)
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}
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defer r.Close()
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packet := dnspacket("test.site.", dns.TypeA)
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// This is purely to ensure that delegation does not race with SetUpstreams.
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var wg sync.WaitGroup
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wg.Add(2)
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go func() {
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defer wg.Done()
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r.SetUpstreams([]net.Addr{server.PacketConn.LocalAddr()})
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}()
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go func() {
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defer wg.Done()
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syncRespond(r, packet)
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}()
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wg.Wait()
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}
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var allResponse = []byte{
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0x00, 0x00, // transaction id: 0
|
|
0x84, 0x00, // flags: response, authoritative, no error
|
|
0x00, 0x01, // one question
|
|
0x00, 0x01, // one answer
|
|
0x00, 0x00, 0x00, 0x00, // no authority or additional RRs
|
|
// Question:
|
|
0x05, 0x74, 0x65, 0x73, 0x74, 0x31, 0x03, 0x69, 0x70, 0x6e, 0x03, 0x64, 0x65, 0x76, 0x00, // name
|
|
0x00, 0xff, 0x00, 0x01, // type ALL, class IN
|
|
// Answer:
|
|
0x05, 0x74, 0x65, 0x73, 0x74, 0x31, 0x03, 0x69, 0x70, 0x6e, 0x03, 0x64, 0x65, 0x76, 0x00, // name
|
|
0x00, 0x01, 0x00, 0x01, // type A, class IN
|
|
0x00, 0x00, 0x02, 0x58, // TTL: 600
|
|
0x00, 0x04, // length: 4 bytes
|
|
0x01, 0x02, 0x03, 0x04, // A: 1.2.3.4
|
|
}
|
|
|
|
var ipv4Response = []byte{
|
|
0x00, 0x00, // transaction id: 0
|
|
0x84, 0x00, // flags: response, authoritative, no error
|
|
0x00, 0x01, // one question
|
|
0x00, 0x01, // one answer
|
|
0x00, 0x00, 0x00, 0x00, // no authority or additional RRs
|
|
// Question:
|
|
0x05, 0x74, 0x65, 0x73, 0x74, 0x31, 0x03, 0x69, 0x70, 0x6e, 0x03, 0x64, 0x65, 0x76, 0x00, // name
|
|
0x00, 0x01, 0x00, 0x01, // type A, class IN
|
|
// Answer:
|
|
0x05, 0x74, 0x65, 0x73, 0x74, 0x31, 0x03, 0x69, 0x70, 0x6e, 0x03, 0x64, 0x65, 0x76, 0x00, // name
|
|
0x00, 0x01, 0x00, 0x01, // type A, class IN
|
|
0x00, 0x00, 0x02, 0x58, // TTL: 600
|
|
0x00, 0x04, // length: 4 bytes
|
|
0x01, 0x02, 0x03, 0x04, // A: 1.2.3.4
|
|
}
|
|
|
|
var ipv6Response = []byte{
|
|
0x00, 0x00, // transaction id: 0
|
|
0x84, 0x00, // flags: response, authoritative, no error
|
|
0x00, 0x01, // one question
|
|
0x00, 0x01, // one answer
|
|
0x00, 0x00, 0x00, 0x00, // no authority or additional RRs
|
|
// Question:
|
|
0x05, 0x74, 0x65, 0x73, 0x74, 0x32, 0x03, 0x69, 0x70, 0x6e, 0x03, 0x64, 0x65, 0x76, 0x00, // name
|
|
0x00, 0x1c, 0x00, 0x01, // type AAAA, class IN
|
|
// Answer:
|
|
0x05, 0x74, 0x65, 0x73, 0x74, 0x32, 0x03, 0x69, 0x70, 0x6e, 0x03, 0x64, 0x65, 0x76, 0x00, // name
|
|
0x00, 0x1c, 0x00, 0x01, // type AAAA, class IN
|
|
0x00, 0x00, 0x02, 0x58, // TTL: 600
|
|
0x00, 0x10, // length: 16 bytes
|
|
// AAAA: 0001:0203:0405:0607:0809:0A0B:0C0D:0E0F
|
|
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0xb, 0xc, 0xd, 0xe, 0xf,
|
|
}
|
|
|
|
var ipv4UppercaseResponse = []byte{
|
|
0x00, 0x00, // transaction id: 0
|
|
0x84, 0x00, // flags: response, authoritative, no error
|
|
0x00, 0x01, // one question
|
|
0x00, 0x01, // one answer
|
|
0x00, 0x00, 0x00, 0x00, // no authority or additional RRs
|
|
// Question:
|
|
0x05, 0x54, 0x45, 0x53, 0x54, 0x31, 0x03, 0x49, 0x50, 0x4e, 0x03, 0x44, 0x45, 0x56, 0x00, // name
|
|
0x00, 0x01, 0x00, 0x01, // type A, class IN
|
|
// Answer:
|
|
0x05, 0x54, 0x45, 0x53, 0x54, 0x31, 0x03, 0x49, 0x50, 0x4e, 0x03, 0x44, 0x45, 0x56, 0x00, // name
|
|
0x00, 0x01, 0x00, 0x01, // type A, class IN
|
|
0x00, 0x00, 0x02, 0x58, // TTL: 600
|
|
0x00, 0x04, // length: 4 bytes
|
|
0x01, 0x02, 0x03, 0x04, // A: 1.2.3.4
|
|
}
|
|
|
|
var ptrResponse = []byte{
|
|
0x00, 0x00, // transaction id: 0
|
|
0x84, 0x00, // flags: response, authoritative, no error
|
|
0x00, 0x01, // one question
|
|
0x00, 0x01, // one answer
|
|
0x00, 0x00, 0x00, 0x00, // no authority or additional RRs
|
|
// Question: 4.3.2.1.in-addr.arpa
|
|
0x01, 0x34, 0x01, 0x33, 0x01, 0x32, 0x01, 0x31, 0x07,
|
|
0x69, 0x6e, 0x2d, 0x61, 0x64, 0x64, 0x72, 0x04, 0x61, 0x72, 0x70, 0x61, 0x00,
|
|
0x00, 0x0c, 0x00, 0x01, // type PTR, class IN
|
|
// Answer: 4.3.2.1.in-addr.arpa
|
|
0x01, 0x34, 0x01, 0x33, 0x01, 0x32, 0x01, 0x31, 0x07,
|
|
0x69, 0x6e, 0x2d, 0x61, 0x64, 0x64, 0x72, 0x04, 0x61, 0x72, 0x70, 0x61, 0x00,
|
|
0x00, 0x0c, 0x00, 0x01, // type PTR, class IN
|
|
0x00, 0x00, 0x02, 0x58, // TTL: 600
|
|
0x00, 0x0f, // length: 15 bytes
|
|
// PTR: test1.ipn.dev
|
|
0x05, 0x74, 0x65, 0x73, 0x74, 0x31, 0x03, 0x69, 0x70, 0x6e, 0x03, 0x64, 0x65, 0x76, 0x00,
|
|
}
|
|
|
|
var ptrResponse6 = []byte{
|
|
0x00, 0x00, // transaction id: 0
|
|
0x84, 0x00, // flags: response, authoritative, no error
|
|
0x00, 0x01, // one question
|
|
0x00, 0x01, // one answer
|
|
0x00, 0x00, 0x00, 0x00, // no authority or additional RRs
|
|
// Question: f.0.e.0.d.0.c.0.b.0.a.0.9.0.8.0.7.0.6.0.5.0.4.0.3.0.2.0.1.0.0.0.ip6.arpa
|
|
0x01, 0x66, 0x01, 0x30, 0x01, 0x65, 0x01, 0x30,
|
|
0x01, 0x64, 0x01, 0x30, 0x01, 0x63, 0x01, 0x30,
|
|
0x01, 0x62, 0x01, 0x30, 0x01, 0x61, 0x01, 0x30,
|
|
0x01, 0x39, 0x01, 0x30, 0x01, 0x38, 0x01, 0x30,
|
|
0x01, 0x37, 0x01, 0x30, 0x01, 0x36, 0x01, 0x30,
|
|
0x01, 0x35, 0x01, 0x30, 0x01, 0x34, 0x01, 0x30,
|
|
0x01, 0x33, 0x01, 0x30, 0x01, 0x32, 0x01, 0x30,
|
|
0x01, 0x31, 0x01, 0x30, 0x01, 0x30, 0x01, 0x30,
|
|
0x03, 0x69, 0x70, 0x36,
|
|
0x04, 0x61, 0x72, 0x70, 0x61, 0x00,
|
|
0x00, 0x0c, 0x00, 0x01, // type PTR, class IN6
|
|
// Answer: f.0.e.0.d.0.c.0.b.0.a.0.9.0.8.0.7.0.6.0.5.0.4.0.3.0.2.0.1.0.0.0.ip6.arpa
|
|
0x01, 0x66, 0x01, 0x30, 0x01, 0x65, 0x01, 0x30,
|
|
0x01, 0x64, 0x01, 0x30, 0x01, 0x63, 0x01, 0x30,
|
|
0x01, 0x62, 0x01, 0x30, 0x01, 0x61, 0x01, 0x30,
|
|
0x01, 0x39, 0x01, 0x30, 0x01, 0x38, 0x01, 0x30,
|
|
0x01, 0x37, 0x01, 0x30, 0x01, 0x36, 0x01, 0x30,
|
|
0x01, 0x35, 0x01, 0x30, 0x01, 0x34, 0x01, 0x30,
|
|
0x01, 0x33, 0x01, 0x30, 0x01, 0x32, 0x01, 0x30,
|
|
0x01, 0x31, 0x01, 0x30, 0x01, 0x30, 0x01, 0x30,
|
|
0x03, 0x69, 0x70, 0x36,
|
|
0x04, 0x61, 0x72, 0x70, 0x61, 0x00,
|
|
0x00, 0x0c, 0x00, 0x01, // type PTR, class IN
|
|
0x00, 0x00, 0x02, 0x58, // TTL: 600
|
|
0x00, 0x0f, // length: 15 bytes
|
|
// PTR: test2.ipn.dev
|
|
0x05, 0x74, 0x65, 0x73, 0x74, 0x32, 0x03, 0x69, 0x70, 0x6e, 0x03, 0x64, 0x65, 0x76, 0x00,
|
|
}
|
|
|
|
var nxdomainResponse = []byte{
|
|
0x00, 0x00, // transaction id: 0
|
|
0x84, 0x03, // flags: response, authoritative, error: nxdomain
|
|
0x00, 0x01, // one question
|
|
0x00, 0x00, // no answers
|
|
0x00, 0x00, 0x00, 0x00, // no authority or additional RRs
|
|
// Question:
|
|
0x05, 0x74, 0x65, 0x73, 0x74, 0x33, 0x03, 0x69, 0x70, 0x6e, 0x03, 0x64, 0x65, 0x76, 0x00, // name
|
|
0x00, 0x01, 0x00, 0x01, // type A, class IN
|
|
}
|
|
|
|
var emptyResponse = []byte{
|
|
0x00, 0x00, // transaction id: 0
|
|
0x84, 0x00, // flags: response, authoritative, no error
|
|
0x00, 0x01, // one question
|
|
0x00, 0x00, // no answers
|
|
0x00, 0x00, 0x00, 0x00, // no authority or additional RRs
|
|
// Question:
|
|
0x05, 0x74, 0x65, 0x73, 0x74, 0x31, 0x03, 0x69, 0x70, 0x6e, 0x03, 0x64, 0x65, 0x76, 0x00, // name
|
|
0x00, 0x1c, 0x00, 0x01, // type AAAA, class IN
|
|
}
|
|
|
|
func TestFull(t *testing.T) {
|
|
r := NewResolver(ResolverConfig{Logf: t.Logf, Forward: false})
|
|
r.SetMap(dnsMap)
|
|
|
|
if err := r.Start(); err != nil {
|
|
t.Fatalf("start: %v", err)
|
|
}
|
|
defer r.Close()
|
|
|
|
// One full packet and one error packet
|
|
tests := []struct {
|
|
name string
|
|
request []byte
|
|
response []byte
|
|
}{
|
|
{"all", dnspacket("test1.ipn.dev.", dns.TypeALL), allResponse},
|
|
{"ipv4", dnspacket("test1.ipn.dev.", dns.TypeA), ipv4Response},
|
|
{"ipv6", dnspacket("test2.ipn.dev.", dns.TypeAAAA), ipv6Response},
|
|
{"no-ipv6", dnspacket("test1.ipn.dev.", dns.TypeAAAA), emptyResponse},
|
|
{"upper", dnspacket("TEST1.IPN.DEV.", dns.TypeA), ipv4UppercaseResponse},
|
|
{"ptr", dnspacket("4.3.2.1.in-addr.arpa.", dns.TypePTR), ptrResponse},
|
|
{"ptr", dnspacket("f.0.e.0.d.0.c.0.b.0.a.0.9.0.8.0.7.0.6.0.5.0.4.0.3.0.2.0.1.0.0.0.ip6.arpa.",
|
|
dns.TypePTR), ptrResponse6},
|
|
{"nxdomain", dnspacket("test3.ipn.dev.", dns.TypeA), nxdomainResponse},
|
|
}
|
|
|
|
for _, tt := range tests {
|
|
t.Run(tt.name, func(t *testing.T) {
|
|
response, err := syncRespond(r, tt.request)
|
|
if err != nil {
|
|
t.Errorf("err = %v; want nil", err)
|
|
}
|
|
if !bytes.Equal(response, tt.response) {
|
|
t.Errorf("response = %x; want %x", response, tt.response)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestAllocs(t *testing.T) {
|
|
r := NewResolver(ResolverConfig{Logf: t.Logf, Forward: false})
|
|
r.SetMap(dnsMap)
|
|
|
|
if err := r.Start(); err != nil {
|
|
t.Fatalf("start: %v", err)
|
|
}
|
|
defer r.Close()
|
|
|
|
// It is seemingly pointless to test allocs in the delegate path,
|
|
// as dialer.Dial -> Read -> Write alone comprise 12 allocs.
|
|
tests := []struct {
|
|
name string
|
|
query []byte
|
|
want int
|
|
}{
|
|
// Name lowercasing and response slice created by dns.NewBuilder.
|
|
{"forward", dnspacket("test1.ipn.dev.", dns.TypeA), 2},
|
|
// 3 extra allocs in rdnsNameToIPv4 and one in marshalPTRRecord (dns.NewName).
|
|
{"reverse", dnspacket("4.3.2.1.in-addr.arpa.", dns.TypePTR), 5},
|
|
}
|
|
|
|
for _, tt := range tests {
|
|
allocs := testing.AllocsPerRun(100, func() {
|
|
syncRespond(r, tt.query)
|
|
})
|
|
if int(allocs) > tt.want {
|
|
t.Errorf("%s: allocs = %v; want %v", tt.name, allocs, tt.want)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestTrimRDNSBonjourPrefix(t *testing.T) {
|
|
tests := []struct {
|
|
in string
|
|
want bool
|
|
}{
|
|
{"b._dns-sd._udp.0.10.20.172.in-addr.arpa.", true},
|
|
{"db._dns-sd._udp.0.10.20.172.in-addr.arpa.", true},
|
|
{"r._dns-sd._udp.0.10.20.172.in-addr.arpa.", true},
|
|
{"dr._dns-sd._udp.0.10.20.172.in-addr.arpa.", true},
|
|
{"lb._dns-sd._udp.0.10.20.172.in-addr.arpa.", true},
|
|
{"qq._dns-sd._udp.0.10.20.172.in-addr.arpa.", false},
|
|
{"0.10.20.172.in-addr.arpa.", false},
|
|
{"i-have-no-dot", false},
|
|
}
|
|
|
|
for _, test := range tests {
|
|
got := hasRDNSBonjourPrefix(test.in)
|
|
if got != test.want {
|
|
t.Errorf("trimRDNSBonjourPrefix(%q) = %v, want %v", test.in, got, test.want)
|
|
}
|
|
}
|
|
}
|
|
|
|
func BenchmarkFull(b *testing.B) {
|
|
dnsHandleFunc("test.site.", resolveToIP(testipv4, testipv6, "dns.test.site."))
|
|
|
|
server, errch := serveDNS("127.0.0.1:0")
|
|
defer func() {
|
|
if err := <-errch; err != nil {
|
|
b.Errorf("server error: %v", err)
|
|
}
|
|
}()
|
|
|
|
if server == nil {
|
|
return
|
|
}
|
|
defer server.Shutdown()
|
|
|
|
r := NewResolver(ResolverConfig{Logf: b.Logf, Forward: true})
|
|
r.SetMap(dnsMap)
|
|
r.SetUpstreams([]net.Addr{server.PacketConn.LocalAddr()})
|
|
|
|
if err := r.Start(); err != nil {
|
|
b.Fatalf("start: %v", err)
|
|
}
|
|
defer r.Close()
|
|
|
|
tests := []struct {
|
|
name string
|
|
request []byte
|
|
}{
|
|
{"forward", dnspacket("test1.ipn.dev.", dns.TypeA)},
|
|
{"reverse", dnspacket("4.3.2.1.in-addr.arpa.", dns.TypePTR)},
|
|
{"delegated", dnspacket("test.site.", dns.TypeA)},
|
|
}
|
|
|
|
for _, tt := range tests {
|
|
b.Run(tt.name, func(b *testing.B) {
|
|
for i := 0; i < b.N; i++ {
|
|
syncRespond(r, tt.request)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestMarshalResponseFormatError(t *testing.T) {
|
|
resp := new(response)
|
|
resp.Header.RCode = dns.RCodeFormatError
|
|
v, err := marshalResponse(resp)
|
|
if err != nil {
|
|
t.Errorf("marshal error: %v", err)
|
|
}
|
|
t.Logf("response: %q", v)
|
|
}
|