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tailscale/net/dns/resolver/forwarder_test.go

213 lines
4.7 KiB
Go

// Copyright (c) 2021 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 resolver
import (
"flag"
"fmt"
"net"
"reflect"
"strings"
"testing"
"time"
dns "golang.org/x/net/dns/dnsmessage"
"tailscale.com/hostinfo"
"tailscale.com/types/dnstype"
)
func (rr resolverAndDelay) String() string {
return fmt.Sprintf("%v+%v", rr.name, rr.startDelay)
}
func TestResolversWithDelays(t *testing.T) {
// query
q := func(ss ...string) (ipps []dnstype.Resolver) {
for _, s := range ss {
host, _, err := net.SplitHostPort(s)
if err != nil {
t.Fatal(err)
}
ipps = append(ipps, dnstype.Resolver{Addr: host})
}
return
}
// output
o := func(ss ...string) (rr []resolverAndDelay) {
for _, s := range ss {
var d time.Duration
s, durStr, hasPlus := strings.Cut(s, "+")
if hasPlus {
var err error
d, err = time.ParseDuration(durStr)
if err != nil {
panic(fmt.Sprintf("parsing duration in %q: %v", s, err))
}
}
host, _, err := net.SplitHostPort(s)
if err != nil {
t.Fatal(err)
}
rr = append(rr, resolverAndDelay{
name: dnstype.Resolver{Addr: host},
startDelay: d,
})
}
return
}
tests := []struct {
name string
in []dnstype.Resolver
want []resolverAndDelay
}{
{
name: "unknown-no-delays",
in: q("1.2.3.4:53", "2.3.4.5:53"),
want: o("1.2.3.4:53", "2.3.4.5:53"),
},
{
name: "google-all-ipv4",
in: q("8.8.8.8:53", "8.8.4.4:53"),
want: o("8.8.8.8:53", "8.8.4.4:53+200ms"),
},
{
name: "google-only-ipv6",
in: q("[2001:4860:4860::8888]:53", "[2001:4860:4860::8844]:53"),
want: o("[2001:4860:4860::8888]:53", "[2001:4860:4860::8844]:53+200ms"),
},
{
name: "google-all-four",
in: q("8.8.8.8:53", "8.8.4.4:53", "[2001:4860:4860::8888]:53", "[2001:4860:4860::8844]:53"),
want: o("8.8.8.8:53", "8.8.4.4:53+200ms", "[2001:4860:4860::8888]:53+2.5s", "[2001:4860:4860::8844]:53+2.7s"),
},
{
name: "quad9-one-v4-one-v6",
in: q("9.9.9.9:53", "[2620:fe::fe]:53"),
want: o("9.9.9.9:53", "[2620:fe::fe]:53+200ms"),
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got := resolversWithDelays(tt.in)
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("got %v; want %v", got, tt.want)
}
})
}
}
func TestGetRCode(t *testing.T) {
tests := []struct {
name string
packet []byte
want dns.RCode
}{
{
name: "empty",
packet: []byte{},
want: dns.RCode(5),
},
{
name: "too-short",
packet: []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
want: dns.RCode(5),
},
{
name: "noerror",
packet: []byte{0xC4, 0xFE, 0x81, 0xA0, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01},
want: dns.RCode(0),
},
{
name: "refused",
packet: []byte{0xee, 0xa1, 0x81, 0x05, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01},
want: dns.RCode(5),
},
{
name: "nxdomain",
packet: []byte{0x34, 0xf4, 0x81, 0x83, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01},
want: dns.RCode(3),
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got := getRCode(tt.packet)
if got != tt.want {
t.Errorf("got %d; want %d", got, tt.want)
}
})
}
}
func TestMaxDoHInFlight(t *testing.T) {
tests := []struct {
goos string
ver string
want int
}{
{"ios", "", 10},
{"ios", "1532", 10},
{"ios", "9.3.2", 10},
{"ios", "14.3.2", 10},
{"ios", "15.3.2", 1000},
{"ios", "20.3.2", 1000},
{"android", "", 1000},
{"darwin", "", 1000},
{"linux", "", 1000},
}
for _, tc := range tests {
t.Run(fmt.Sprintf("%s-%s", tc.goos, tc.ver), func(t *testing.T) {
hostinfo.SetOSVersion(tc.ver)
got := maxDoHInFlight(tc.goos)
if got != tc.want {
t.Errorf("got %d; want %d", got, tc.want)
}
})
}
}
var testDNS = flag.Bool("test-dns", false, "run tests that require a working DNS server")
func TestGetKnownDoHClientForProvider(t *testing.T) {
var fwd forwarder
c, ok := fwd.getKnownDoHClientForProvider("https://dns.google/dns-query")
if !ok {
t.Fatal("not found")
}
if !*testDNS {
t.Skip("skipping without --test-dns")
}
res, err := c.Head("https://dns.google/")
if err != nil {
t.Fatal(err)
}
defer res.Body.Close()
t.Logf("Got: %+v", res)
}
func BenchmarkNameFromQuery(b *testing.B) {
builder := dns.NewBuilder(nil, dns.Header{})
builder.StartQuestions()
builder.Question(dns.Question{
Name: dns.MustNewName("foo.example."),
Type: dns.TypeA,
Class: dns.ClassINET,
})
msg, err := builder.Finish()
if err != nil {
b.Fatal(err)
}
b.ResetTimer()
b.ReportAllocs()
for i := 0; i < b.N; i++ {
_, err := nameFromQuery(msg)
if err != nil {
b.Fatal(err)
}
}
}