mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-29 21:15:39 +00:00
761 lines
19 KiB
Go
761 lines
19 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 (
|
|
"bytes"
|
|
"errors"
|
|
"net"
|
|
"sync"
|
|
"testing"
|
|
|
|
dns "golang.org/x/net/dns/dnsmessage"
|
|
"inet.af/netaddr"
|
|
"tailscale.com/tstest"
|
|
)
|
|
|
|
var testipv4 = netaddr.IPv4(1, 2, 3, 4)
|
|
var testipv6 = netaddr.IPv6Raw([16]byte{
|
|
0x00, 0x01, 0x02, 0x03,
|
|
0x04, 0x05, 0x06, 0x07,
|
|
0x08, 0x09, 0x0a, 0x0b,
|
|
0x0c, 0x0d, 0x0e, 0x0f,
|
|
})
|
|
|
|
var dnsMap = NewMap(
|
|
map[string]netaddr.IP{
|
|
"test1.ipn.dev.": testipv4,
|
|
"test2.ipn.dev.": testipv6,
|
|
},
|
|
[]string{"ipn.dev."},
|
|
)
|
|
|
|
func dnspacket(domain string, tp dns.Type) []byte {
|
|
var dnsHeader dns.Header
|
|
question := dns.Question{
|
|
Name: dns.MustNewName(domain),
|
|
Type: tp,
|
|
Class: dns.ClassINET,
|
|
}
|
|
|
|
builder := dns.NewBuilder(nil, dnsHeader)
|
|
builder.StartQuestions()
|
|
builder.Question(question)
|
|
payload, _ := builder.Finish()
|
|
|
|
return payload
|
|
}
|
|
|
|
type dnsResponse struct {
|
|
ip netaddr.IP
|
|
name string
|
|
rcode dns.RCode
|
|
}
|
|
|
|
func unpackResponse(payload []byte) (dnsResponse, error) {
|
|
var response dnsResponse
|
|
var parser dns.Parser
|
|
|
|
h, err := parser.Start(payload)
|
|
if err != nil {
|
|
return response, err
|
|
}
|
|
|
|
if !h.Response {
|
|
return response, errors.New("not a response")
|
|
}
|
|
|
|
response.rcode = h.RCode
|
|
if response.rcode != dns.RCodeSuccess {
|
|
return response, nil
|
|
}
|
|
|
|
err = parser.SkipAllQuestions()
|
|
if err != nil {
|
|
return response, err
|
|
}
|
|
|
|
ah, err := parser.AnswerHeader()
|
|
if err != nil {
|
|
return response, err
|
|
}
|
|
|
|
switch ah.Type {
|
|
case dns.TypeA:
|
|
res, err := parser.AResource()
|
|
if err != nil {
|
|
return response, err
|
|
}
|
|
response.ip = netaddr.IPv4(res.A[0], res.A[1], res.A[2], res.A[3])
|
|
case dns.TypeAAAA:
|
|
res, err := parser.AAAAResource()
|
|
if err != nil {
|
|
return response, err
|
|
}
|
|
response.ip = netaddr.IPv6Raw(res.AAAA)
|
|
case dns.TypeNS:
|
|
res, err := parser.NSResource()
|
|
if err != nil {
|
|
return response, err
|
|
}
|
|
response.name = res.NS.String()
|
|
default:
|
|
return response, errors.New("type not in {A, AAAA, NS}")
|
|
}
|
|
|
|
return response, nil
|
|
}
|
|
|
|
func syncRespond(r *Resolver, query []byte) ([]byte, error) {
|
|
request := Packet{Payload: query}
|
|
r.EnqueueRequest(request)
|
|
resp, err := r.NextResponse()
|
|
return resp.Payload, err
|
|
}
|
|
|
|
func mustIP(str string) netaddr.IP {
|
|
ip, err := netaddr.ParseIP(str)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return ip
|
|
}
|
|
|
|
func TestRDNSNameToIPv4(t *testing.T) {
|
|
tests := []struct {
|
|
name string
|
|
input string
|
|
wantIP netaddr.IP
|
|
wantOK bool
|
|
}{
|
|
{"valid", "4.123.24.1.in-addr.arpa.", netaddr.IPv4(1, 24, 123, 4), true},
|
|
{"double_dot", "1..2.3.in-addr.arpa.", netaddr.IP{}, false},
|
|
{"overflow", "1.256.3.4.in-addr.arpa.", netaddr.IP{}, false},
|
|
{"not_ip", "sub.do.ma.in.in-addr.arpa.", netaddr.IP{}, false},
|
|
}
|
|
|
|
for _, tt := range tests {
|
|
t.Run(tt.name, func(t *testing.T) {
|
|
ip, ok := rdnsNameToIPv4(tt.input)
|
|
if ok != tt.wantOK {
|
|
t.Errorf("ok = %v; want %v", ok, tt.wantOK)
|
|
} else if ok && ip != tt.wantIP {
|
|
t.Errorf("ip = %v; want %v", ip, tt.wantIP)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestRDNSNameToIPv6(t *testing.T) {
|
|
tests := []struct {
|
|
name string
|
|
input string
|
|
wantIP netaddr.IP
|
|
wantOK bool
|
|
}{
|
|
{
|
|
"valid",
|
|
"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.",
|
|
mustIP("2001:db8::567:89ab"),
|
|
true,
|
|
},
|
|
{
|
|
"double_dot",
|
|
"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.",
|
|
netaddr.IP{},
|
|
false,
|
|
},
|
|
{
|
|
"double_hex",
|
|
"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.",
|
|
netaddr.IP{},
|
|
false,
|
|
},
|
|
{
|
|
"not_hex",
|
|
"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.",
|
|
netaddr.IP{},
|
|
false,
|
|
},
|
|
}
|
|
|
|
for _, tt := range tests {
|
|
t.Run(tt.name, func(t *testing.T) {
|
|
ip, ok := rdnsNameToIPv6(tt.input)
|
|
if ok != tt.wantOK {
|
|
t.Errorf("ok = %v; want %v", ok, tt.wantOK)
|
|
} else if ok && ip != tt.wantIP {
|
|
t.Errorf("ip = %v; want %v", ip, tt.wantIP)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestResolve(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()
|
|
|
|
tests := []struct {
|
|
name string
|
|
qname string
|
|
qtype dns.Type
|
|
ip netaddr.IP
|
|
code dns.RCode
|
|
}{
|
|
{"ipv4", "test1.ipn.dev.", dns.TypeA, testipv4, dns.RCodeSuccess},
|
|
{"ipv6", "test2.ipn.dev.", dns.TypeAAAA, testipv6, dns.RCodeSuccess},
|
|
{"no-ipv6", "test1.ipn.dev.", dns.TypeAAAA, netaddr.IP{}, dns.RCodeSuccess},
|
|
{"nxdomain", "test3.ipn.dev.", dns.TypeA, netaddr.IP{}, dns.RCodeNameError},
|
|
{"foreign domain", "google.com.", dns.TypeA, netaddr.IP{}, dns.RCodeRefused},
|
|
}
|
|
|
|
for _, tt := range tests {
|
|
t.Run(tt.name, func(t *testing.T) {
|
|
ip, code, err := r.Resolve(tt.qname, tt.qtype)
|
|
if err != nil {
|
|
t.Errorf("err = %v; want nil", err)
|
|
}
|
|
if code != tt.code {
|
|
t.Errorf("code = %v; want %v", code, tt.code)
|
|
}
|
|
// Only check ip for non-err
|
|
if ip != tt.ip {
|
|
t.Errorf("ip = %v; want %v", ip, tt.ip)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestResolveReverse(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()
|
|
|
|
tests := []struct {
|
|
name string
|
|
ip netaddr.IP
|
|
want string
|
|
code dns.RCode
|
|
}{
|
|
{"ipv4", testipv4, "test1.ipn.dev.", dns.RCodeSuccess},
|
|
{"ipv6", testipv6, "test2.ipn.dev.", dns.RCodeSuccess},
|
|
{"nxdomain", netaddr.IPv4(4, 3, 2, 1), "", dns.RCodeNameError},
|
|
}
|
|
|
|
for _, tt := range tests {
|
|
t.Run(tt.name, func(t *testing.T) {
|
|
name, code, err := r.ResolveReverse(tt.ip)
|
|
if err != nil {
|
|
t.Errorf("err = %v; want nil", err)
|
|
}
|
|
if code != tt.code {
|
|
t.Errorf("code = %v; want %v", code, tt.code)
|
|
}
|
|
if name != tt.want {
|
|
t.Errorf("ip = %v; want %v", name, tt.want)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestDelegate(t *testing.T) {
|
|
rc := tstest.NewResourceCheck()
|
|
defer rc.Assert(t)
|
|
|
|
dnsHandleFunc("test.site.", resolveToIP(testipv4, testipv6, "dns.test.site."))
|
|
dnsHandleFunc("nxdomain.site.", resolveToNXDOMAIN)
|
|
|
|
v4server, v4errch := serveDNS("127.0.0.1:0")
|
|
v6server, v6errch := serveDNS("[::1]:0")
|
|
|
|
defer func() {
|
|
if err := <-v4errch; err != nil {
|
|
t.Errorf("v4 server error: %v", err)
|
|
}
|
|
if err := <-v6errch; err != nil {
|
|
t.Errorf("v6 server error: %v", err)
|
|
}
|
|
}()
|
|
if v4server != nil {
|
|
defer v4server.Shutdown()
|
|
}
|
|
if v6server != nil {
|
|
defer v6server.Shutdown()
|
|
}
|
|
|
|
if v4server == nil || v6server == nil {
|
|
// There is an error in at least one of the channels
|
|
// and we cannot proceed; return to see it.
|
|
return
|
|
}
|
|
|
|
r := NewResolver(ResolverConfig{Logf: t.Logf, Forward: true})
|
|
r.SetMap(dnsMap)
|
|
r.SetUpstreams([]net.Addr{
|
|
v4server.PacketConn.LocalAddr(),
|
|
v6server.PacketConn.LocalAddr(),
|
|
})
|
|
|
|
if err := r.Start(); err != nil {
|
|
t.Fatalf("start: %v", err)
|
|
}
|
|
defer r.Close()
|
|
|
|
tests := []struct {
|
|
title string
|
|
query []byte
|
|
response dnsResponse
|
|
}{
|
|
{
|
|
"ipv4",
|
|
dnspacket("test.site.", dns.TypeA),
|
|
dnsResponse{ip: testipv4, rcode: dns.RCodeSuccess},
|
|
},
|
|
{
|
|
"ipv6",
|
|
dnspacket("test.site.", dns.TypeAAAA),
|
|
dnsResponse{ip: testipv6, rcode: dns.RCodeSuccess},
|
|
},
|
|
{
|
|
"ns",
|
|
dnspacket("test.site.", dns.TypeNS),
|
|
dnsResponse{name: "dns.test.site.", rcode: dns.RCodeSuccess},
|
|
},
|
|
{
|
|
"nxdomain",
|
|
dnspacket("nxdomain.site.", dns.TypeA),
|
|
dnsResponse{rcode: dns.RCodeNameError},
|
|
},
|
|
}
|
|
|
|
for _, tt := range tests {
|
|
t.Run(tt.title, func(t *testing.T) {
|
|
payload, err := syncRespond(r, tt.query)
|
|
if err != nil {
|
|
t.Errorf("err = %v; want nil", err)
|
|
return
|
|
}
|
|
response, err := unpackResponse(payload)
|
|
if err != nil {
|
|
t.Errorf("extract: err = %v; want nil (in %x)", err, payload)
|
|
return
|
|
}
|
|
if response.rcode != tt.response.rcode {
|
|
t.Errorf("rcode = %v; want %v", response.rcode, tt.response.rcode)
|
|
}
|
|
if response.ip != tt.response.ip {
|
|
t.Errorf("ip = %v; want %v", response.ip, tt.response.ip)
|
|
}
|
|
if response.name != tt.response.name {
|
|
t.Errorf("name = %v; want %v", response.name, tt.response.name)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestDelegateCollision(t *testing.T) {
|
|
dnsHandleFunc("test.site.", resolveToIP(testipv4, testipv6, "dns.test.site."))
|
|
|
|
server, errch := serveDNS("127.0.0.1:0")
|
|
defer func() {
|
|
if err := <-errch; err != nil {
|
|
t.Errorf("server error: %v", err)
|
|
}
|
|
}()
|
|
|
|
if server == nil {
|
|
return
|
|
}
|
|
defer server.Shutdown()
|
|
|
|
r := NewResolver(ResolverConfig{Logf: t.Logf, Forward: true})
|
|
r.SetMap(dnsMap)
|
|
r.SetUpstreams([]net.Addr{server.PacketConn.LocalAddr()})
|
|
|
|
if err := r.Start(); err != nil {
|
|
t.Fatalf("start: %v", err)
|
|
}
|
|
defer r.Close()
|
|
|
|
packets := []struct {
|
|
qname string
|
|
qtype dns.Type
|
|
addr netaddr.IPPort
|
|
}{
|
|
{"test.site.", dns.TypeA, netaddr.IPPort{IP: netaddr.IPv4(1, 1, 1, 1), Port: 1001}},
|
|
{"test.site.", dns.TypeAAAA, netaddr.IPPort{IP: netaddr.IPv4(1, 1, 1, 1), Port: 1002}},
|
|
}
|
|
|
|
// packets will have the same dns txid.
|
|
for _, p := range packets {
|
|
payload := dnspacket(p.qname, p.qtype)
|
|
req := Packet{Payload: payload, Addr: p.addr}
|
|
err := r.EnqueueRequest(req)
|
|
if err != nil {
|
|
t.Error(err)
|
|
}
|
|
}
|
|
|
|
// Despite the txid collision, the answer(s) should still match the query.
|
|
resp, err := r.NextResponse()
|
|
if err != nil {
|
|
t.Error(err)
|
|
}
|
|
|
|
var p dns.Parser
|
|
_, err = p.Start(resp.Payload)
|
|
if err != nil {
|
|
t.Error(err)
|
|
}
|
|
err = p.SkipAllQuestions()
|
|
if err != nil {
|
|
t.Error(err)
|
|
}
|
|
ans, err := p.AllAnswers()
|
|
if err != nil {
|
|
t.Error(err)
|
|
}
|
|
|
|
var wantType dns.Type
|
|
switch ans[0].Body.(type) {
|
|
case *dns.AResource:
|
|
wantType = dns.TypeA
|
|
case *dns.AAAAResource:
|
|
wantType = dns.TypeAAAA
|
|
default:
|
|
t.Errorf("unexpected answer type: %T", ans[0].Body)
|
|
}
|
|
|
|
for _, p := range packets {
|
|
if p.qtype == wantType && p.addr != resp.Addr {
|
|
t.Errorf("addr = %v; want %v", resp.Addr, p.addr)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestConcurrentSetMap(t *testing.T) {
|
|
r := NewResolver(ResolverConfig{Logf: t.Logf, Forward: false})
|
|
|
|
if err := r.Start(); err != nil {
|
|
t.Fatalf("start: %v", err)
|
|
}
|
|
defer r.Close()
|
|
|
|
// This is purely to ensure that Resolve does not race with SetMap.
|
|
var wg sync.WaitGroup
|
|
wg.Add(2)
|
|
go func() {
|
|
defer wg.Done()
|
|
r.SetMap(dnsMap)
|
|
}()
|
|
go func() {
|
|
defer wg.Done()
|
|
r.Resolve("test1.ipn.dev", dns.TypeA)
|
|
}()
|
|
wg.Wait()
|
|
}
|
|
|
|
func TestConcurrentSetUpstreams(t *testing.T) {
|
|
dnsHandleFunc("test.site.", resolveToIP(testipv4, testipv6, "dns.test.site."))
|
|
|
|
server, errch := serveDNS("127.0.0.1:0")
|
|
defer func() {
|
|
if err := <-errch; err != nil {
|
|
t.Errorf("server error: %v", err)
|
|
}
|
|
}()
|
|
|
|
if server == nil {
|
|
return
|
|
}
|
|
defer server.Shutdown()
|
|
|
|
r := NewResolver(ResolverConfig{Logf: t.Logf, Forward: true})
|
|
r.SetMap(dnsMap)
|
|
|
|
if err := r.Start(); err != nil {
|
|
t.Fatalf("start: %v", err)
|
|
}
|
|
defer r.Close()
|
|
|
|
packet := dnspacket("test.site.", dns.TypeA)
|
|
// This is purely to ensure that delegation does not race with SetUpstreams.
|
|
var wg sync.WaitGroup
|
|
wg.Add(2)
|
|
go func() {
|
|
defer wg.Done()
|
|
r.SetUpstreams([]net.Addr{server.PacketConn.LocalAddr()})
|
|
}()
|
|
go func() {
|
|
defer wg.Done()
|
|
syncRespond(r, packet)
|
|
}()
|
|
wg.Wait()
|
|
}
|
|
|
|
var allResponse = []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, 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 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},
|
|
{"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)
|
|
}
|