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tailscale/tstest/integration/vms/vms_test.go

700 lines
17 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.
//go:build !windows
// +build !windows
package vms
import (
"bytes"
"context"
"flag"
"fmt"
"net"
"os"
"os/exec"
"path/filepath"
"regexp"
"strconv"
"strings"
"sync"
"testing"
"text/template"
"time"
"github.com/pkg/sftp"
expect "github.com/tailscale/goexpect"
"golang.org/x/crypto/ssh"
"golang.org/x/sync/semaphore"
"inet.af/netaddr"
"tailscale.com/tstest"
"tailscale.com/types/logger"
)
const (
securePassword = "hunter2"
bucketName = "tailscale-integration-vm-images"
)
var (
runVMTests = flag.Bool("run-vm-tests", false, "if set, run expensive VM based integration tests")
noS3 = flag.Bool("no-s3", false, "if set, always download images from the public internet (risks breaking)")
vmRamLimit = flag.Int("ram-limit", 4096, "the maximum number of megabytes of ram that can be used for VMs, must be greater than or equal to 1024")
useVNC = flag.Bool("use-vnc", false, "if set, display guest vms over VNC")
verboseLogcatcher = flag.Bool("verbose-logcatcher", true, "if set, print logcatcher to t.Logf")
verboseQemu = flag.Bool("verbose-qemu", true, "if set, print qemu console to t.Logf")
distroRex = func() *regexValue {
result := &regexValue{r: regexp.MustCompile(`.*`)}
flag.Var(result, "distro-regex", "The regex that matches what distros should be run")
return result
}()
)
func TestDownloadImages(t *testing.T) {
if !*runVMTests {
t.Skip("not running integration tests (need --run-vm-tests)")
}
for _, d := range Distros {
distro := d
t.Run(distro.Name, func(t *testing.T) {
t.Parallel()
if !distroRex.Unwrap().MatchString(distro.Name) {
t.Skipf("distro name %q doesn't match regex: %s", distro.Name, distroRex)
}
if strings.HasPrefix(distro.Name, "nixos") {
t.Skip("NixOS is built on the fly, no need to download it")
}
fetchDistro(t, distro)
})
}
}
// run runs a command or fails the test.
func run(t *testing.T, dir, prog string, args ...string) {
t.Helper()
t.Logf("running: %s %s", prog, strings.Join(args, " "))
tstest.FixLogs(t)
cmd := exec.Command(prog, args...)
cmd.Stdout = logger.FuncWriter(t.Logf)
cmd.Stderr = logger.FuncWriter(t.Logf)
cmd.Dir = dir
if err := cmd.Run(); err != nil {
t.Fatal(err)
}
}
// mkLayeredQcow makes a layered qcow image that allows us to keep the upstream
// VM images pristine and only do our changes on an overlay.
func mkLayeredQcow(t *testing.T, tdir string, d Distro, qcowBase string) {
t.Helper()
run(t, tdir, "qemu-img", "create",
"-f", "qcow2",
"-o", "backing_file="+qcowBase,
filepath.Join(tdir, d.Name+".qcow2"),
)
}
var (
metaDataTempl = template.Must(template.New("meta-data.yaml").Parse(metaDataTemplate))
userDataTempl = template.Must(template.New("user-data.yaml").Parse(userDataTemplate))
)
// mkSeed makes the cloud-init seed ISO that is used to configure a VM with
// tailscale.
func mkSeed(t *testing.T, d Distro, sshKey, hostURL, tdir string, port int) {
t.Helper()
dir := filepath.Join(tdir, d.Name, "seed")
os.MkdirAll(dir, 0700)
// make meta-data
{
fout, err := os.Create(filepath.Join(dir, "meta-data"))
if err != nil {
t.Fatal(err)
}
err = metaDataTempl.Execute(fout, struct {
ID string
Hostname string
}{
ID: "31337",
Hostname: d.Name,
})
if err != nil {
t.Fatal(err)
}
err = fout.Close()
if err != nil {
t.Fatal(err)
}
}
// make user-data
{
fout, err := os.Create(filepath.Join(dir, "user-data"))
if err != nil {
t.Fatal(err)
}
err = userDataTempl.Execute(fout, struct {
SSHKey string
HostURL string
Hostname string
Port int
InstallPre string
Password string
}{
SSHKey: strings.TrimSpace(sshKey),
HostURL: hostURL,
Hostname: d.Name,
Port: port,
InstallPre: d.InstallPre(),
Password: securePassword,
})
if err != nil {
t.Fatal(err)
}
err = fout.Close()
if err != nil {
t.Fatal(err)
}
}
args := []string{
"-output", filepath.Join(dir, "seed.iso"),
"-volid", "cidata", "-joliet", "-rock",
filepath.Join(dir, "meta-data"),
filepath.Join(dir, "user-data"),
}
if hackOpenSUSE151UserData(t, d, dir) {
args = append(args, filepath.Join(dir, "openstack"))
}
run(t, tdir, "genisoimage", args...)
}
// ipMapping maps a hostname, SSH port and SSH IP together
type ipMapping struct {
name string
port int
ip string
}
// getProbablyFreePortNumber does what it says on the tin, but as a side effect
// it is a kind of racy function. Do not use this carelessly.
//
// This is racy because it does not "lock" the port number with the OS. The
// "random" port number that is returned here is most likely free to use, however
// it is difficult to be 100% sure. This function should be used with care. It
// will probably do what you want, but it is very easy to hold this wrong.
func getProbablyFreePortNumber() (int, error) {
l, err := net.Listen("tcp", ":0")
if err != nil {
return 0, err
}
defer l.Close()
_, port, err := net.SplitHostPort(l.Addr().String())
if err != nil {
return 0, err
}
portNum, err := strconv.Atoi(port)
if err != nil {
return 0, err
}
return portNum, nil
}
func setupTests(t *testing.T) {
ramsem.once.Do(func() {
ramsem.sem = semaphore.NewWeighted(int64(*vmRamLimit))
})
if !*runVMTests {
t.Skip("not running integration tests (need --run-vm-tests)")
}
os.Setenv("CGO_ENABLED", "0")
if _, err := exec.LookPath("qemu-system-x86_64"); err != nil {
t.Logf("hint: nix-shell -p go -p qemu -p cdrkit --run 'go test --v --timeout=60m --run-vm-tests'")
t.Fatalf("missing dependency: %v", err)
}
if _, err := exec.LookPath("genisoimage"); err != nil {
t.Logf("hint: nix-shell -p go -p qemu -p cdrkit --run 'go test --v --timeout=60m --run-vm-tests'")
t.Fatalf("missing dependency: %v", err)
}
}
var ramsem struct {
once sync.Once
sem *semaphore.Weighted
}
func testOneDistribution(t *testing.T, n int, distro Distro) {
setupTests(t)
if distroRex.Unwrap().MatchString(distro.Name) {
t.Logf("%s matches %s", distro.Name, distroRex.Unwrap())
} else {
t.Skip("regex not matched")
}
ctx, done := context.WithCancel(context.Background())
t.Cleanup(done)
h := newHarness(t)
dir := t.TempDir()
err := ramsem.sem.Acquire(ctx, int64(distro.MemoryMegs))
if err != nil {
t.Fatalf("can't acquire ram semaphore: %v", err)
}
t.Cleanup(func() { ramsem.sem.Release(int64(distro.MemoryMegs)) })
vm := h.mkVM(t, n, distro, h.pubKey, h.loginServerURL, dir)
var ipm ipMapping
for i := 0; i < 100; i++ {
if vm.running() {
break
}
time.Sleep(100 * time.Millisecond)
}
if !vm.running() {
t.Fatal("vm not running")
}
waiter := time.NewTicker(time.Second)
defer waiter.Stop()
for {
var ok bool
h.ipMu.Lock()
ipm, ok = h.ipMap[distro.Name]
h.ipMu.Unlock()
if ok {
break
}
if !vm.running() {
t.Fatal("vm not running")
}
<-waiter.C
}
h.testDistro(t, distro, ipm)
}
func (h *Harness) testDistro(t *testing.T, d Distro, ipm ipMapping) {
signer := h.signer
loginServer := h.loginServerURL
t.Helper()
port := ipm.port
hostport := fmt.Sprintf("127.0.0.1:%d", port)
ccfg := &ssh.ClientConfig{
User: "root",
Auth: []ssh.AuthMethod{ssh.PublicKeys(signer), ssh.Password(securePassword)},
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}
// NOTE(Xe): This deadline loop helps to make things a bit faster, centos
// sometimes is slow at starting its sshd and will sometimes randomly kill
// SSH sessions on transition to multi-user.target. I don't know why they
// don't use socket activation.
const maxRetries = 5
var working bool
for i := 0; i < maxRetries; i++ {
cli, err := ssh.Dial("tcp", hostport, ccfg)
if err == nil {
working = true
cli.Close()
break
}
time.Sleep(10 * time.Second)
}
if !working {
t.Fatalf("can't connect to %s, tried %d times", hostport, maxRetries)
}
t.Logf("about to ssh into 127.0.0.1:%d", port)
cli, err := ssh.Dial("tcp", hostport, ccfg)
if err != nil {
t.Fatal(err)
}
h.copyBinaries(t, d, cli)
timeout := 30 * time.Second
t.Run("start-tailscale", func(t *testing.T) {
var batch = []expect.Batcher{
&expect.BExp{R: `(\#)`},
}
switch d.InitSystem {
case "openrc":
// NOTE(Xe): this is a sin, however openrc doesn't really have the concept
// of service readiness. If this sleep is removed then tailscale will not be
// ready once the `tailscale up` command is sent. This is not ideal, but I
// am not really sure there is a good way around this without a delay of
// some kind.
batch = append(batch, &expect.BSnd{S: "rc-service tailscaled start && sleep 2\n"})
case "systemd":
batch = append(batch, &expect.BSnd{S: "systemctl start tailscaled.service\n"})
}
batch = append(batch, &expect.BExp{R: `(\#)`})
runTestCommands(t, timeout, cli, batch)
})
t.Run("login", func(t *testing.T) {
runTestCommands(t, timeout, cli, []expect.Batcher{
&expect.BSnd{S: fmt.Sprintf("tailscale up --login-server=%s\n", loginServer)},
&expect.BExp{R: `Success.`},
})
})
t.Run("tailscale status", func(t *testing.T) {
dur := 100 * time.Millisecond
var outp []byte
var err error
// NOTE(Xe): retry `tailscale status` a few times until it works. When tailscaled
// starts with testcontrol sometimes there can be up to a few seconds where
// tailscaled is in an unknown state on these virtual machines. This exponential
// delay loop should delay long enough for tailscaled to be ready.
for count := 0; count < 10; count++ {
sess := getSession(t, cli)
outp, err = sess.CombinedOutput("tailscale status")
if err == nil {
t.Logf("tailscale status: %s", outp)
if !strings.Contains(string(outp), "100.64.0.1") {
t.Fatal("can't find tester IP")
}
return
}
time.Sleep(dur)
dur = dur * 2
}
t.Log(string(outp))
t.Fatalf("error: %v", err)
})
t.Run("dump routes", func(t *testing.T) {
sess, err := cli.NewSession()
if err != nil {
t.Fatal(err)
}
defer sess.Close()
sess.Stdout = logger.FuncWriter(t.Logf)
sess.Stderr = logger.FuncWriter(t.Logf)
err = sess.Run("ip route show table 52")
if err != nil {
t.Fatal(err)
}
sess, err = cli.NewSession()
if err != nil {
t.Fatal(err)
}
defer sess.Close()
sess.Stdout = logger.FuncWriter(t.Logf)
sess.Stderr = logger.FuncWriter(t.Logf)
err = sess.Run("ip -6 route show table 52")
if err != nil {
t.Fatal(err)
}
})
for _, tt := range []struct {
ipProto string
addr netaddr.IP
}{
{"ipv4", h.testerV4},
} {
t.Run(tt.ipProto+"-address", func(t *testing.T) {
sess := getSession(t, cli)
ipBytes, err := sess.Output("tailscale ip -" + string(tt.ipProto[len(tt.ipProto)-1]))
if err != nil {
t.Fatalf("can't get IP: %v", err)
}
netaddr.MustParseIP(string(bytes.TrimSpace(ipBytes)))
})
t.Run("ping-"+tt.ipProto, func(t *testing.T) {
h.testPing(t, tt.addr, cli)
})
t.Run("outgoing-tcp-"+tt.ipProto, func(t *testing.T) {
h.testOutgoingTCP(t, tt.addr, cli)
})
}
t.Run("incoming-ssh-ipv4", func(t *testing.T) {
sess, err := cli.NewSession()
if err != nil {
t.Fatalf("can't make incoming session: %v", err)
}
defer sess.Close()
ipBytes, err := sess.Output("tailscale ip -4")
if err != nil {
t.Fatalf("can't run `tailscale ip -4`: %v", err)
}
ip := string(bytes.TrimSpace(ipBytes))
conn, err := h.testerDialer.Dial("tcp", net.JoinHostPort(ip, "22"))
if err != nil {
t.Fatalf("can't dial connection to vm: %v", err)
}
defer conn.Close()
conn.SetDeadline(time.Now().Add(30 * time.Second))
sshConn, chanchan, reqchan, err := ssh.NewClientConn(conn, net.JoinHostPort(ip, "22"), ccfg)
if err != nil {
t.Fatalf("can't negotiate connection over tailscale: %v", err)
}
defer sshConn.Close()
cli := ssh.NewClient(sshConn, chanchan, reqchan)
defer cli.Close()
sess, err = cli.NewSession()
if err != nil {
t.Fatalf("can't make SSH session with VM: %v", err)
}
defer sess.Close()
testIPBytes, err := sess.Output("tailscale ip -4")
if err != nil {
t.Fatalf("can't run command on remote VM: %v", err)
}
if !bytes.Equal(testIPBytes, ipBytes) {
t.Fatalf("wanted reported ip to be %q, got: %q", string(ipBytes), string(testIPBytes))
}
})
t.Run("outgoing-udp-ipv4", func(t *testing.T) {
cwd, err := os.Getwd()
if err != nil {
t.Fatalf("can't get working directory: %v", err)
}
dir := t.TempDir()
run(t, cwd, "go", "build", "-o", filepath.Join(dir, "udp_tester"), "./udp_tester.go")
sftpCli, err := sftp.NewClient(cli)
if err != nil {
t.Fatalf("can't connect over sftp to copy binaries: %v", err)
}
defer sftpCli.Close()
copyFile(t, sftpCli, filepath.Join(dir, "udp_tester"), "/udp_tester")
uaddr, err := net.ResolveUDPAddr("udp", net.JoinHostPort("::", "0"))
if err != nil {
t.Fatalf("can't resolve udp listener addr: %v", err)
}
buf := make([]byte, 2048)
ln, err := net.ListenUDP("udp", uaddr)
if err != nil {
t.Fatalf("can't listen for UDP traffic: %v", err)
}
defer ln.Close()
ctx, cancel := context.WithCancel(context.Background())
t.Cleanup(cancel)
go func() {
for {
select {
case <-ctx.Done():
return
default:
}
sess, err := cli.NewSession()
if err != nil {
t.Errorf("can't open session: %v", err)
return
}
defer sess.Close()
sess.Stdin = strings.NewReader("hi")
sess.Stdout = logger.FuncWriter(t.Logf)
sess.Stderr = logger.FuncWriter(t.Logf)
_, port, _ := net.SplitHostPort(ln.LocalAddr().String())
cmd := fmt.Sprintf("/udp_tester -client %s\n", net.JoinHostPort("100.64.0.1", port))
t.Logf("sending packet: %s", cmd)
err = sess.Run(cmd)
if err != nil {
t.Logf("can't send UDP packet: %v", err)
}
time.Sleep(10 * time.Millisecond)
}
}()
t.Log("listening for packet")
n, _, err := ln.ReadFromUDP(buf)
if err != nil {
t.Fatal(err)
}
if n == 0 {
t.Fatal("got nothing")
}
if !bytes.Contains(buf, []byte("hi")) {
t.Fatal("did not get UDP message")
}
})
t.Run("incoming-udp-ipv4", func(t *testing.T) {
// vms_test.go:947: can't dial: socks connect udp 127.0.0.1:36497->100.64.0.2:33409: network not implemented
t.Skip("can't make outgoing sockets over UDP with our socks server")
sess, err := cli.NewSession()
if err != nil {
t.Fatalf("can't open session: %v", err)
}
defer sess.Close()
ip, err := sess.Output("tailscale ip -4")
if err != nil {
t.Fatalf("can't nab ipv4 address: %v", err)
}
port, err := getProbablyFreePortNumber()
if err != nil {
t.Fatalf("unable to fetch port number: %v", err)
}
go func() {
time.Sleep(10 * time.Millisecond)
conn, err := h.testerDialer.Dial("udp", net.JoinHostPort(string(bytes.TrimSpace(ip)), strconv.Itoa(port)))
if err != nil {
t.Errorf("can't dial: %v", err)
}
fmt.Fprint(conn, securePassword)
}()
sess, err = cli.NewSession()
if err != nil {
t.Fatalf("can't open session: %v", err)
}
defer sess.Close()
sess.Stderr = logger.FuncWriter(t.Logf)
msg, err := sess.Output(
fmt.Sprintf(
"/udp_tester -server %s",
net.JoinHostPort(string(bytes.TrimSpace(ip)), strconv.Itoa(port)),
),
)
if msg := string(bytes.TrimSpace(msg)); msg != securePassword {
t.Fatalf("wanted %q from vm, got: %q", securePassword, msg)
}
})
t.Run("dns-test", func(t *testing.T) {
t.Run("etc-resolv-conf", func(t *testing.T) {
sess := getSession(t, cli)
sess.Stdout = logger.FuncWriter(t.Logf)
sess.Stderr = logger.FuncWriter(t.Errorf)
if err := sess.Run("cat /etc/resolv.conf"); err != nil {
t.Fatal(err)
}
})
cwd, err := os.Getwd()
if err != nil {
t.Fatalf("can't get working directory: %v", err)
}
dir := t.TempDir()
run(t, cwd, "go", "build", "-o", filepath.Join(dir, "dns_tester"), "./dns_tester.go")
sftpCli, err := sftp.NewClient(cli)
if err != nil {
t.Fatalf("can't connect over sftp to copy binaries: %v", err)
}
defer sftpCli.Close()
copyFile(t, sftpCli, filepath.Join(dir, "dns_tester"), "/dns_tester")
for _, record := range []string{"extratest.record", "extratest"} {
t.Run(record, func(t *testing.T) {
sess := getSession(t, cli)
sess.Stderr = logger.FuncWriter(t.Errorf)
msg, err := sess.Output("/dns_tester " + record)
if err != nil {
t.Fatal(err)
}
msg = bytes.TrimSpace(msg)
if want := []byte("1.2.3.4"); !bytes.Contains(msg, want) {
t.Fatalf("got: %q, want: %q", msg, want)
}
})
}
})
}
func runTestCommands(t *testing.T, timeout time.Duration, cli *ssh.Client, batch []expect.Batcher) {
e, _, err := expect.SpawnSSH(cli, timeout,
expect.Verbose(true),
expect.VerboseWriter(logger.FuncWriter(t.Logf)),
// // NOTE(Xe): if you get a timeout, uncomment this region to have the raw
// // output be sent to the test log quicker.
// expect.Tee(nopWriteCloser{logger.FuncWriter(t.Logf)}),
)
if err != nil {
t.Fatalf("%s: can't register a shell session: %v", cli.RemoteAddr(), err)
}
defer e.Close()
_, err = e.ExpectBatch(batch, timeout)
if err != nil {
sess, terr := cli.NewSession()
if terr != nil {
t.Fatalf("can't dump tailscaled logs on failed test: %v", terr)
}
sess.Stdout = logger.FuncWriter(t.Logf)
sess.Stderr = logger.FuncWriter(t.Logf)
terr = sess.Run("journalctl -u tailscaled")
if terr != nil {
t.Fatalf("can't dump tailscaled logs on failed test: %v", terr)
}
t.Fatalf("not successful: %v", err)
}
}