mirror of
https://github.com/tailscale/tailscale.git
synced 2024-12-12 19:24:40 +00:00
648 lines
16 KiB
Go
648 lines
16 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 netcheck
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import (
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"bytes"
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"context"
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"fmt"
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"net"
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"reflect"
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"sort"
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"strconv"
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"strings"
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"testing"
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"time"
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"inet.af/netaddr"
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"tailscale.com/net/interfaces"
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"tailscale.com/net/stun"
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"tailscale.com/net/stun/stuntest"
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"tailscale.com/tailcfg"
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)
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func TestHairpinSTUN(t *testing.T) {
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tx := stun.NewTxID()
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c := &Client{
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curState: &reportState{
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hairTX: tx,
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gotHairSTUN: make(chan netaddr.IPPort, 1),
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},
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}
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req := stun.Request(tx)
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if !stun.Is(req) {
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t.Fatal("expected STUN message")
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}
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if !c.handleHairSTUNLocked(req, netaddr.IPPort{}) {
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t.Fatal("expected true")
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}
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select {
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case <-c.curState.gotHairSTUN:
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default:
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t.Fatal("expected value")
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}
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}
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func TestBasic(t *testing.T) {
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stunAddr, cleanup := stuntest.Serve(t)
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defer cleanup()
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c := &Client{
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Logf: t.Logf,
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UDPBindAddr: "127.0.0.1:0",
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}
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ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
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defer cancel()
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r, err := c.GetReport(ctx, stuntest.DERPMapOf(stunAddr.String()))
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if err != nil {
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t.Fatal(err)
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}
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if !r.UDP {
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t.Error("want UDP")
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}
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if len(r.RegionLatency) != 1 {
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t.Errorf("expected 1 key in DERPLatency; got %+v", r.RegionLatency)
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}
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if _, ok := r.RegionLatency[1]; !ok {
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t.Errorf("expected key 1 in DERPLatency; got %+v", r.RegionLatency)
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}
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if r.GlobalV4 == "" {
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t.Error("expected GlobalV4 set")
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}
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if r.PreferredDERP != 1 {
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t.Errorf("PreferredDERP = %v; want 1", r.PreferredDERP)
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}
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}
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func TestWorksWhenUDPBlocked(t *testing.T) {
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blackhole, err := net.ListenPacket("udp4", "127.0.0.1:0")
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if err != nil {
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t.Fatalf("failed to open blackhole STUN listener: %v", err)
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}
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defer blackhole.Close()
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stunAddr := blackhole.LocalAddr().String()
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dm := stuntest.DERPMapOf(stunAddr)
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dm.Regions[1].Nodes[0].STUNOnly = true
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c := &Client{
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Logf: t.Logf,
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}
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ctx, cancel := context.WithTimeout(context.Background(), 250*time.Millisecond)
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defer cancel()
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r, err := c.GetReport(ctx, dm)
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if err != nil {
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t.Fatal(err)
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}
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want := newReport()
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r.UPnP = ""
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r.PMP = ""
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r.PCP = ""
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if !reflect.DeepEqual(r, want) {
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t.Errorf("mismatch\n got: %+v\nwant: %+v\n", r, want)
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}
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}
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func TestAddReportHistoryAndSetPreferredDERP(t *testing.T) {
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// report returns a *Report from (DERP host, time.Duration)+ pairs.
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report := func(a ...interface{}) *Report {
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r := &Report{RegionLatency: map[int]time.Duration{}}
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for i := 0; i < len(a); i += 2 {
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s := a[i].(string)
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if !strings.HasPrefix(s, "d") {
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t.Fatalf("invalid derp server key %q", s)
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}
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regionID, err := strconv.Atoi(s[1:])
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if err != nil {
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t.Fatalf("invalid derp server key %q", s)
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}
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switch v := a[i+1].(type) {
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case time.Duration:
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r.RegionLatency[regionID] = v
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case int:
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r.RegionLatency[regionID] = time.Second * time.Duration(v)
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default:
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panic(fmt.Sprintf("unexpected type %T", v))
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}
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}
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return r
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}
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type step struct {
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after time.Duration
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r *Report
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}
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tests := []struct {
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name string
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steps []step
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wantDERP int // want PreferredDERP on final step
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wantPrevLen int // wanted len(c.prev)
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}{
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{
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name: "first_reading",
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steps: []step{
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{0, report("d1", 2, "d2", 3)},
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},
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wantPrevLen: 1,
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wantDERP: 1,
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},
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{
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name: "with_two",
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steps: []step{
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{0, report("d1", 2, "d2", 3)},
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{1 * time.Second, report("d1", 4, "d2", 3)},
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},
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wantPrevLen: 2,
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wantDERP: 1, // t0's d1 of 2 is still best
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},
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{
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name: "but_now_d1_gone",
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steps: []step{
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{0, report("d1", 2, "d2", 3)},
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{1 * time.Second, report("d1", 4, "d2", 3)},
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{2 * time.Second, report("d2", 3)},
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},
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wantPrevLen: 3,
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wantDERP: 2, // only option
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},
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{
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name: "d1_is_back",
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steps: []step{
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{0, report("d1", 2, "d2", 3)},
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{1 * time.Second, report("d1", 4, "d2", 3)},
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{2 * time.Second, report("d2", 3)},
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{3 * time.Second, report("d1", 4, "d2", 3)}, // same as 2 seconds ago
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},
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wantPrevLen: 4,
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wantDERP: 1, // t0's d1 of 2 is still best
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},
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{
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name: "things_clean_up",
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steps: []step{
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{0, report("d1", 1, "d2", 2)},
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{1 * time.Second, report("d1", 1, "d2", 2)},
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{2 * time.Second, report("d1", 1, "d2", 2)},
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{3 * time.Second, report("d1", 1, "d2", 2)},
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{10 * time.Minute, report("d3", 3)},
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},
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wantPrevLen: 1, // t=[0123]s all gone. (too old, older than 10 min)
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wantDERP: 3, // only option
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},
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{
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name: "preferred_derp_hysteresis_no_switch",
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steps: []step{
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{0 * time.Second, report("d1", 4, "d2", 5)},
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{1 * time.Second, report("d1", 4, "d2", 3)},
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},
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wantPrevLen: 2,
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wantDERP: 1, // 2 didn't get fast enough
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},
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{
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name: "preferred_derp_hysteresis_do_switch",
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steps: []step{
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{0 * time.Second, report("d1", 4, "d2", 5)},
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{1 * time.Second, report("d1", 4, "d2", 1)},
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},
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wantPrevLen: 2,
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wantDERP: 2, // 2 got fast enough
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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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fakeTime := time.Unix(123, 0)
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c := &Client{
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TimeNow: func() time.Time { return fakeTime },
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}
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for _, s := range tt.steps {
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fakeTime = fakeTime.Add(s.after)
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c.addReportHistoryAndSetPreferredDERP(s.r)
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}
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lastReport := tt.steps[len(tt.steps)-1].r
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if got, want := len(c.prev), tt.wantPrevLen; got != want {
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t.Errorf("len(prev) = %v; want %v", got, want)
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}
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if got, want := lastReport.PreferredDERP, tt.wantDERP; got != want {
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t.Errorf("PreferredDERP = %v; want %v", got, want)
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}
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})
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}
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}
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func TestMakeProbePlan(t *testing.T) {
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// basicMap has 5 regions. each region has a number of nodes
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// equal to the region number (1 has 1a, 2 has 2a and 2b, etc.)
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basicMap := &tailcfg.DERPMap{
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Regions: map[int]*tailcfg.DERPRegion{},
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}
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for rid := 1; rid <= 5; rid++ {
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var nodes []*tailcfg.DERPNode
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for nid := 0; nid < rid; nid++ {
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nodes = append(nodes, &tailcfg.DERPNode{
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Name: fmt.Sprintf("%d%c", rid, 'a'+rune(nid)),
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RegionID: rid,
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HostName: fmt.Sprintf("derp%d-%d", rid, nid),
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IPv4: fmt.Sprintf("%d.0.0.%d", rid, nid),
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IPv6: fmt.Sprintf("%d::%d", rid, nid),
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})
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}
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basicMap.Regions[rid] = &tailcfg.DERPRegion{
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RegionID: rid,
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Nodes: nodes,
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}
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}
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const ms = time.Millisecond
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p := func(name string, c rune, d ...time.Duration) probe {
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var proto probeProto
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switch c {
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case 4:
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proto = probeIPv4
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case 6:
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proto = probeIPv6
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case 'h':
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proto = probeHTTPS
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}
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pr := probe{node: name, proto: proto}
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if len(d) == 1 {
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pr.delay = d[0]
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} else if len(d) > 1 {
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panic("too many args")
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}
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return pr
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}
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tests := []struct {
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name string
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dm *tailcfg.DERPMap
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have6if bool
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no4 bool // no IPv4
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last *Report
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want probePlan
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}{
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{
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name: "initial_v6",
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dm: basicMap,
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have6if: true,
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last: nil, // initial
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want: probePlan{
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"region-1-v4": []probe{p("1a", 4), p("1a", 4, 100*ms), p("1a", 4, 200*ms)}, // all a
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"region-1-v6": []probe{p("1a", 6), p("1a", 6, 100*ms), p("1a", 6, 200*ms)},
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"region-2-v4": []probe{p("2a", 4), p("2b", 4, 100*ms), p("2a", 4, 200*ms)}, // a -> b -> a
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"region-2-v6": []probe{p("2a", 6), p("2b", 6, 100*ms), p("2a", 6, 200*ms)},
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"region-3-v4": []probe{p("3a", 4), p("3b", 4, 100*ms), p("3c", 4, 200*ms)}, // a -> b -> c
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"region-3-v6": []probe{p("3a", 6), p("3b", 6, 100*ms), p("3c", 6, 200*ms)},
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"region-4-v4": []probe{p("4a", 4), p("4b", 4, 100*ms), p("4c", 4, 200*ms)},
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"region-4-v6": []probe{p("4a", 6), p("4b", 6, 100*ms), p("4c", 6, 200*ms)},
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"region-5-v4": []probe{p("5a", 4), p("5b", 4, 100*ms), p("5c", 4, 200*ms)},
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"region-5-v6": []probe{p("5a", 6), p("5b", 6, 100*ms), p("5c", 6, 200*ms)},
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},
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},
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{
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name: "initial_no_v6",
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dm: basicMap,
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have6if: false,
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last: nil, // initial
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want: probePlan{
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"region-1-v4": []probe{p("1a", 4), p("1a", 4, 100*ms), p("1a", 4, 200*ms)}, // all a
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"region-2-v4": []probe{p("2a", 4), p("2b", 4, 100*ms), p("2a", 4, 200*ms)}, // a -> b -> a
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"region-3-v4": []probe{p("3a", 4), p("3b", 4, 100*ms), p("3c", 4, 200*ms)}, // a -> b -> c
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"region-4-v4": []probe{p("4a", 4), p("4b", 4, 100*ms), p("4c", 4, 200*ms)},
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"region-5-v4": []probe{p("5a", 4), p("5b", 4, 100*ms), p("5c", 4, 200*ms)},
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},
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},
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{
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name: "second_v4_no_6if",
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dm: basicMap,
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have6if: false,
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last: &Report{
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RegionLatency: map[int]time.Duration{
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1: 10 * time.Millisecond,
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2: 20 * time.Millisecond,
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3: 30 * time.Millisecond,
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4: 40 * time.Millisecond,
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// Pretend 5 is missing
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},
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RegionV4Latency: map[int]time.Duration{
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1: 10 * time.Millisecond,
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2: 20 * time.Millisecond,
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3: 30 * time.Millisecond,
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4: 40 * time.Millisecond,
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},
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},
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want: probePlan{
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"region-1-v4": []probe{p("1a", 4), p("1a", 4, 12*ms)},
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"region-2-v4": []probe{p("2a", 4), p("2b", 4, 24*ms)},
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"region-3-v4": []probe{p("3a", 4)},
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},
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},
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{
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name: "second_v4_only_with_6if",
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dm: basicMap,
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have6if: true,
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last: &Report{
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RegionLatency: map[int]time.Duration{
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1: 10 * time.Millisecond,
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2: 20 * time.Millisecond,
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3: 30 * time.Millisecond,
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4: 40 * time.Millisecond,
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// Pretend 5 is missing
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},
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RegionV4Latency: map[int]time.Duration{
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1: 10 * time.Millisecond,
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2: 20 * time.Millisecond,
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3: 30 * time.Millisecond,
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4: 40 * time.Millisecond,
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},
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},
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want: probePlan{
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"region-1-v4": []probe{p("1a", 4), p("1a", 4, 12*ms)},
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"region-1-v6": []probe{p("1a", 6)},
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"region-2-v4": []probe{p("2a", 4), p("2b", 4, 24*ms)},
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"region-2-v6": []probe{p("2a", 6)},
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"region-3-v4": []probe{p("3a", 4)},
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},
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},
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{
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name: "second_mixed",
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dm: basicMap,
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have6if: true,
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last: &Report{
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RegionLatency: map[int]time.Duration{
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1: 10 * time.Millisecond,
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2: 20 * time.Millisecond,
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3: 30 * time.Millisecond,
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4: 40 * time.Millisecond,
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// Pretend 5 is missing
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},
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RegionV4Latency: map[int]time.Duration{
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1: 10 * time.Millisecond,
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2: 20 * time.Millisecond,
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},
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RegionV6Latency: map[int]time.Duration{
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3: 30 * time.Millisecond,
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4: 40 * time.Millisecond,
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},
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},
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want: probePlan{
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"region-1-v4": []probe{p("1a", 4), p("1a", 4, 12*ms)},
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"region-1-v6": []probe{p("1a", 6), p("1a", 6, 12*ms)},
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"region-2-v4": []probe{p("2a", 4), p("2b", 4, 24*ms)},
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"region-2-v6": []probe{p("2a", 6), p("2b", 6, 24*ms)},
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"region-3-v4": []probe{p("3a", 4)},
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},
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},
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{
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name: "only_v6_initial",
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have6if: true,
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no4: true,
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dm: basicMap,
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want: probePlan{
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"region-1-v6": []probe{p("1a", 6), p("1a", 6, 100*ms), p("1a", 6, 200*ms)},
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"region-2-v6": []probe{p("2a", 6), p("2b", 6, 100*ms), p("2a", 6, 200*ms)},
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"region-3-v6": []probe{p("3a", 6), p("3b", 6, 100*ms), p("3c", 6, 200*ms)},
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"region-4-v6": []probe{p("4a", 6), p("4b", 6, 100*ms), p("4c", 6, 200*ms)},
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"region-5-v6": []probe{p("5a", 6), p("5b", 6, 100*ms), p("5c", 6, 200*ms)},
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},
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},
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{
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name: "try_harder_for_preferred_derp",
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dm: basicMap,
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have6if: true,
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last: &Report{
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RegionLatency: map[int]time.Duration{
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1: 10 * time.Millisecond,
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2: 20 * time.Millisecond,
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3: 30 * time.Millisecond,
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4: 40 * time.Millisecond,
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},
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RegionV4Latency: map[int]time.Duration{
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1: 10 * time.Millisecond,
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2: 20 * time.Millisecond,
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},
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RegionV6Latency: map[int]time.Duration{
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3: 30 * time.Millisecond,
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4: 40 * time.Millisecond,
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},
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PreferredDERP: 1,
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},
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want: probePlan{
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"region-1-v4": []probe{p("1a", 4), p("1a", 4, 12*ms), p("1a", 4, 124*ms), p("1a", 4, 186*ms)},
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"region-1-v6": []probe{p("1a", 6), p("1a", 6, 12*ms), p("1a", 6, 124*ms), p("1a", 6, 186*ms)},
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"region-2-v4": []probe{p("2a", 4), p("2b", 4, 24*ms)},
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"region-2-v6": []probe{p("2a", 6), p("2b", 6, 24*ms)},
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"region-3-v4": []probe{p("3a", 4)},
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},
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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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ifState := &interfaces.State{
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HaveV6Global: tt.have6if,
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HaveV4: !tt.no4,
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}
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got := makeProbePlan(tt.dm, ifState, tt.last)
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if !reflect.DeepEqual(got, tt.want) {
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t.Errorf("unexpected plan; got:\n%v\nwant:\n%v\n", got, tt.want)
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}
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})
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}
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}
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func (plan probePlan) String() string {
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var sb strings.Builder
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keys := []string{}
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for k := range plan {
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keys = append(keys, k)
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}
|
|
sort.Strings(keys)
|
|
|
|
for _, key := range keys {
|
|
fmt.Fprintf(&sb, "[%s]", key)
|
|
pv := plan[key]
|
|
for _, p := range pv {
|
|
fmt.Fprintf(&sb, " %v", p)
|
|
}
|
|
sb.WriteByte('\n')
|
|
}
|
|
return sb.String()
|
|
}
|
|
|
|
func (p probe) String() string {
|
|
wait := ""
|
|
if p.wait > 0 {
|
|
wait = "+" + p.wait.String()
|
|
}
|
|
delay := ""
|
|
if p.delay > 0 {
|
|
delay = "@" + p.delay.String()
|
|
}
|
|
return fmt.Sprintf("%s-%s%s%s", p.node, p.proto, delay, wait)
|
|
}
|
|
|
|
func (p probeProto) String() string {
|
|
switch p {
|
|
case probeIPv4:
|
|
return "v4"
|
|
case probeIPv6:
|
|
return "v4"
|
|
case probeHTTPS:
|
|
return "https"
|
|
}
|
|
return "?"
|
|
}
|
|
|
|
func TestLogConciseReport(t *testing.T) {
|
|
dm := &tailcfg.DERPMap{
|
|
Regions: map[int]*tailcfg.DERPRegion{
|
|
1: nil,
|
|
2: nil,
|
|
3: nil,
|
|
},
|
|
}
|
|
const ms = time.Millisecond
|
|
tests := []struct {
|
|
name string
|
|
r *Report
|
|
want string
|
|
}{
|
|
{
|
|
name: "no_udp",
|
|
r: &Report{},
|
|
want: "udp=false v4=false v6=false mapvarydest= hair= portmap=? derp=0",
|
|
},
|
|
{
|
|
name: "ipv4_one_region",
|
|
r: &Report{
|
|
UDP: true,
|
|
IPv4: true,
|
|
PreferredDERP: 1,
|
|
RegionLatency: map[int]time.Duration{
|
|
1: 10 * ms,
|
|
},
|
|
RegionV4Latency: map[int]time.Duration{
|
|
1: 10 * ms,
|
|
},
|
|
},
|
|
want: "udp=true v6=false mapvarydest= hair= portmap=? derp=1 derpdist=1v4:10ms",
|
|
},
|
|
{
|
|
name: "ipv4_all_region",
|
|
r: &Report{
|
|
UDP: true,
|
|
IPv4: true,
|
|
PreferredDERP: 1,
|
|
RegionLatency: map[int]time.Duration{
|
|
1: 10 * ms,
|
|
2: 20 * ms,
|
|
3: 30 * ms,
|
|
},
|
|
RegionV4Latency: map[int]time.Duration{
|
|
1: 10 * ms,
|
|
2: 20 * ms,
|
|
3: 30 * ms,
|
|
},
|
|
},
|
|
want: "udp=true v6=false mapvarydest= hair= portmap=? derp=1 derpdist=1v4:10ms,2v4:20ms,3v4:30ms",
|
|
},
|
|
{
|
|
name: "ipboth_all_region",
|
|
r: &Report{
|
|
UDP: true,
|
|
IPv4: true,
|
|
IPv6: true,
|
|
PreferredDERP: 1,
|
|
RegionLatency: map[int]time.Duration{
|
|
1: 10 * ms,
|
|
2: 20 * ms,
|
|
3: 30 * ms,
|
|
},
|
|
RegionV4Latency: map[int]time.Duration{
|
|
1: 10 * ms,
|
|
2: 20 * ms,
|
|
3: 30 * ms,
|
|
},
|
|
RegionV6Latency: map[int]time.Duration{
|
|
1: 10 * ms,
|
|
2: 20 * ms,
|
|
3: 30 * ms,
|
|
},
|
|
},
|
|
want: "udp=true v6=true mapvarydest= hair= portmap=? derp=1 derpdist=1v4:10ms,1v6:10ms,2v4:20ms,2v6:20ms,3v4:30ms,3v6:30ms",
|
|
},
|
|
{
|
|
name: "portmap_all",
|
|
r: &Report{
|
|
UDP: true,
|
|
UPnP: "true",
|
|
PMP: "true",
|
|
PCP: "true",
|
|
},
|
|
want: "udp=true v4=false v6=false mapvarydest= hair= portmap=UMC derp=0",
|
|
},
|
|
{
|
|
name: "portmap_some",
|
|
r: &Report{
|
|
UDP: true,
|
|
UPnP: "true",
|
|
PMP: "false",
|
|
PCP: "true",
|
|
},
|
|
want: "udp=true v4=false v6=false mapvarydest= hair= portmap=UC derp=0",
|
|
},
|
|
}
|
|
for _, tt := range tests {
|
|
t.Run(tt.name, func(t *testing.T) {
|
|
var buf bytes.Buffer
|
|
c := &Client{Logf: func(f string, a ...interface{}) { fmt.Fprintf(&buf, f, a...) }}
|
|
c.logConciseReport(tt.r, dm)
|
|
if got := strings.TrimPrefix(buf.String(), "[v1] report: "); got != tt.want {
|
|
t.Errorf("unexpected result.\n got: %#q\nwant: %#q\n", got, tt.want)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestSortRegions(t *testing.T) {
|
|
unsortedMap := &tailcfg.DERPMap{
|
|
Regions: map[int]*tailcfg.DERPRegion{},
|
|
}
|
|
for rid := 1; rid <= 5; rid++ {
|
|
var nodes []*tailcfg.DERPNode
|
|
nodes = append(nodes, &tailcfg.DERPNode{
|
|
Name: fmt.Sprintf("%da", rid),
|
|
RegionID: rid,
|
|
HostName: fmt.Sprintf("derp%d-1", rid),
|
|
IPv4: fmt.Sprintf("%d.0.0.1", rid),
|
|
IPv6: fmt.Sprintf("%d::1", rid),
|
|
})
|
|
unsortedMap.Regions[rid] = &tailcfg.DERPRegion{
|
|
RegionID: rid,
|
|
Nodes: nodes,
|
|
}
|
|
}
|
|
report := newReport()
|
|
report.RegionLatency[1] = time.Second * time.Duration(5)
|
|
report.RegionLatency[2] = time.Second * time.Duration(3)
|
|
report.RegionLatency[3] = time.Second * time.Duration(6)
|
|
report.RegionLatency[4] = time.Second * time.Duration(0)
|
|
report.RegionLatency[5] = time.Second * time.Duration(2)
|
|
sortedMap := sortRegions(unsortedMap, report)
|
|
|
|
// Sorting by latency this should result in rid: 5, 2, 1, 3
|
|
// rid 4 with latency 0 should be at the end
|
|
want := []int{5, 2, 1, 3, 4}
|
|
got := make([]int, len(sortedMap))
|
|
for i, r := range sortedMap {
|
|
got[i] = r.RegionID
|
|
}
|
|
if !reflect.DeepEqual(got, want) {
|
|
t.Errorf("got %v; want %v", got, want)
|
|
}
|
|
}
|