mirror of
https://github.com/tailscale/tailscale.git
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535b925d1b
Continuing work in 434af15a04
, to make it possible for magicsock to
probe whether a DERP server is still there.
Updates #3619
Change-Id: I366a77c27e93b876734e64f445b85ef01eb590f2
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
209 lines
4.2 KiB
Go
209 lines
4.2 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 derphttp
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import (
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"context"
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"crypto/tls"
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"net"
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"net/http"
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"sync"
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"testing"
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"time"
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"tailscale.com/derp"
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"tailscale.com/types/key"
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)
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func TestSendRecv(t *testing.T) {
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serverPrivateKey := key.NewNode()
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const numClients = 3
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var clientPrivateKeys []key.NodePrivate
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var clientKeys []key.NodePublic
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for i := 0; i < numClients; i++ {
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priv := key.NewNode()
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clientPrivateKeys = append(clientPrivateKeys, priv)
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clientKeys = append(clientKeys, priv.Public())
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}
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s := derp.NewServer(serverPrivateKey, t.Logf)
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defer s.Close()
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httpsrv := &http.Server{
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TLSNextProto: make(map[string]func(*http.Server, *tls.Conn, http.Handler)),
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Handler: Handler(s),
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}
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ln, err := net.Listen("tcp4", "localhost:0")
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if err != nil {
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t.Fatal(err)
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}
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serverURL := "http://" + ln.Addr().String()
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t.Logf("server URL: %s", serverURL)
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go func() {
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if err := httpsrv.Serve(ln); err != nil {
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if err == http.ErrServerClosed {
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return
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}
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panic(err)
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}
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}()
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var clients []*Client
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var recvChs []chan []byte
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done := make(chan struct{})
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var wg sync.WaitGroup
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defer func() {
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close(done)
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for _, c := range clients {
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c.Close()
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}
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wg.Wait()
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}()
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for i := 0; i < numClients; i++ {
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key := clientPrivateKeys[i]
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c, err := NewClient(key, serverURL, t.Logf)
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if err != nil {
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t.Fatalf("client %d: %v", i, err)
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}
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if err := c.Connect(context.Background()); err != nil {
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t.Fatalf("client %d Connect: %v", i, err)
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}
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waitConnect(t, c)
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clients = append(clients, c)
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recvChs = append(recvChs, make(chan []byte))
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wg.Add(1)
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go func(i int) {
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defer wg.Done()
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for {
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select {
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case <-done:
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return
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default:
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}
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m, err := c.Recv()
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if err != nil {
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select {
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case <-done:
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return
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default:
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}
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t.Logf("client%d: %v", i, err)
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break
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}
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switch m := m.(type) {
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default:
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t.Errorf("unexpected message type %T", m)
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continue
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case derp.PeerGoneMessage:
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// Ignore.
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case derp.ReceivedPacket:
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recvChs[i] <- append([]byte(nil), m.Data...)
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}
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}
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}(i)
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}
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recv := func(i int, want string) {
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t.Helper()
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select {
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case b := <-recvChs[i]:
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if got := string(b); got != want {
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t.Errorf("client1.Recv=%q, want %q", got, want)
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}
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case <-time.After(5 * time.Second):
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t.Errorf("client%d.Recv, got nothing, want %q", i, want)
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}
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}
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recvNothing := func(i int) {
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t.Helper()
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select {
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case b := <-recvChs[0]:
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t.Errorf("client%d.Recv=%q, want nothing", i, string(b))
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default:
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}
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}
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msg1 := []byte("hello 0->1\n")
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if err := clients[0].Send(clientKeys[1], msg1); err != nil {
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t.Fatal(err)
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}
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recv(1, string(msg1))
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recvNothing(0)
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recvNothing(2)
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msg2 := []byte("hello 1->2\n")
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if err := clients[1].Send(clientKeys[2], msg2); err != nil {
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t.Fatal(err)
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}
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recv(2, string(msg2))
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recvNothing(0)
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recvNothing(1)
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}
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func waitConnect(t testing.TB, c *Client) {
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t.Helper()
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if m, err := c.Recv(); err != nil {
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t.Fatalf("client first Recv: %v", err)
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} else if v, ok := m.(derp.ServerInfoMessage); !ok {
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t.Fatalf("client first Recv was unexpected type %T", v)
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}
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}
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func TestPing(t *testing.T) {
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serverPrivateKey := key.NewNode()
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s := derp.NewServer(serverPrivateKey, t.Logf)
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defer s.Close()
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httpsrv := &http.Server{
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TLSNextProto: make(map[string]func(*http.Server, *tls.Conn, http.Handler)),
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Handler: Handler(s),
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}
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ln, err := net.Listen("tcp4", "localhost:0")
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if err != nil {
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t.Fatal(err)
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}
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serverURL := "http://" + ln.Addr().String()
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t.Logf("server URL: %s", serverURL)
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go func() {
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if err := httpsrv.Serve(ln); err != nil {
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if err == http.ErrServerClosed {
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return
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}
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panic(err)
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}
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}()
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c, err := NewClient(key.NewNode(), serverURL, t.Logf)
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if err != nil {
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t.Fatalf("NewClient: %v", err)
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}
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defer c.Close()
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if err := c.Connect(context.Background()); err != nil {
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t.Fatalf("client Connect: %v", err)
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}
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errc := make(chan error, 1)
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go func() {
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for {
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m, err := c.Recv()
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if err != nil {
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errc <- err
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return
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}
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t.Logf("Recv: %T", m)
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}
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}()
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err = c.Ping(context.Background())
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if err != nil {
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t.Fatalf("Ping: %v", err)
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}
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}
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