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418 lines
10 KiB
Go
418 lines
10 KiB
Go
// Copyright (c) 2021 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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//go:build !windows
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// +build !windows
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package vms
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import (
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"bytes"
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"context"
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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"io"
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"net"
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"net/http"
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"os"
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"os/exec"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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"testing"
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"github.com/aws/aws-sdk-go-v2/aws"
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"github.com/aws/aws-sdk-go-v2/config"
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"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
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"github.com/aws/aws-sdk-go-v2/service/s3"
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"github.com/pkg/sftp"
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"golang.org/x/crypto/ssh"
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"tailscale.com/types/logger"
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)
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type vmInstance struct {
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d Distro
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cmd *exec.Cmd
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done chan struct{}
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doneErr error // not written until done is closed
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}
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func (vm *vmInstance) running() bool {
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select {
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case <-vm.done:
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return false
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default:
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return true
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}
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}
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// mkVM makes a KVM-accelerated virtual machine and prepares it for introduction
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// to the testcontrol server. The function it returns is for killing the virtual
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// machine when it is time for it to die.
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func (h *Harness) mkVM(t *testing.T, n int, d Distro, sshKey, hostURL, tdir string) *vmInstance {
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t.Helper()
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cdir, err := os.UserCacheDir()
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if err != nil {
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t.Fatalf("can't find cache dir: %v", err)
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}
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cdir = filepath.Join(cdir, "tailscale", "vm-test")
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os.MkdirAll(filepath.Join(cdir, "qcow2"), 0755)
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port, err := getProbablyFreePortNumber()
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if err != nil {
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t.Fatal(err)
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}
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mkLayeredQcow(t, tdir, d, fetchDistro(t, d))
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mkSeed(t, d, sshKey, hostURL, tdir, port)
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driveArg := fmt.Sprintf("file=%s,if=virtio", filepath.Join(tdir, d.Name+".qcow2"))
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args := []string{
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"-machine", "q35,accel=kvm,usb=off,vmport=off,dump-guest-core=off",
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"-netdev", fmt.Sprintf("user,hostfwd=::%d-:22,id=net0", port),
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"-device", "virtio-net-pci,netdev=net0,id=net0,mac=8a:28:5c:30:1f:25",
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"-m", fmt.Sprint(d.MemoryMegs),
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"-cpu", "host",
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"-smp", "4",
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"-boot", "c",
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"-drive", driveArg,
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"-cdrom", filepath.Join(tdir, d.Name, "seed", "seed.iso"),
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"-smbios", "type=1,serial=ds=nocloud;h=" + d.Name,
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"-nographic",
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}
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if *useVNC {
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// test listening on VNC port
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ln, err := net.Listen("tcp", net.JoinHostPort("0.0.0.0", strconv.Itoa(5900+n)))
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if err != nil {
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t.Fatalf("would not be able to listen on the VNC port for the VM: %v", err)
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}
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ln.Close()
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args = append(args, "-vnc", fmt.Sprintf(":%d", n))
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} else {
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args = append(args, "-display", "none")
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}
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t.Logf("running: qemu-system-x86_64 %s", strings.Join(args, " "))
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cmd := exec.Command("qemu-system-x86_64", args...)
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cmd.Stdout = &qemuLog{f: t.Logf}
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cmd.Stderr = &qemuLog{f: t.Logf}
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if err := cmd.Start(); err != nil {
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t.Fatal(err)
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}
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vm := &vmInstance{
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cmd: cmd,
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d: d,
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done: make(chan struct{}),
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}
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go func() {
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vm.doneErr = cmd.Wait()
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close(vm.done)
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}()
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t.Cleanup(func() {
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err := vm.cmd.Process.Kill()
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if err != nil {
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t.Logf("can't kill %s (%d): %v", d.Name, cmd.Process.Pid, err)
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}
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<-vm.done
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})
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return vm
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}
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type qemuLog struct {
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buf []byte
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f logger.Logf
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}
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func (w *qemuLog) Write(p []byte) (int, error) {
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if !*verboseQemu {
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return len(p), nil
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}
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w.buf = append(w.buf, p...)
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if i := bytes.LastIndexByte(w.buf, '\n'); i > 0 {
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j := i
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if w.buf[j-1] == '\r' {
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j--
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}
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buf := ansiEscCodeRE.ReplaceAll(w.buf[:j], nil)
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w.buf = w.buf[i+1:]
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w.f("qemu console: %q", buf)
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}
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return len(p), nil
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}
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var ansiEscCodeRE = regexp.MustCompile("\x1b" + `\[[0-?]*[ -/]*[@-~]`)
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// fetchFromS3 fetches a distribution image from Amazon S3 or reports whether
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// it is unable to. It can fail to fetch from S3 if there is either no AWS
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// configuration (in ~/.aws/credentials) or if the `-no-s3` flag is passed. In
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// that case the test will fall back to downloading distribution images from the
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// public internet.
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//
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// Like fetching from HTTP, the test will fail if an error is encountered during
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// the downloading process.
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//
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// This function writes the distribution image to fout. It is always closed. Do
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// not expect fout to remain writable.
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func fetchFromS3(t *testing.T, fout *os.File, d Distro) bool {
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t.Helper()
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if *noS3 {
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t.Log("you asked to not use S3, not using S3")
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return false
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}
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cfg, err := config.LoadDefaultConfig(context.TODO(), config.WithRegion("us-east-1"))
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if err != nil {
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t.Logf("can't load AWS credentials: %v", err)
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return false
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}
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dler := manager.NewDownloader(s3.NewFromConfig(cfg), func(d *manager.Downloader) {
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d.PartSize = 64 * 1024 * 1024 // 64MB per part
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})
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t.Logf("fetching s3://%s/%s", bucketName, d.SHA256Sum)
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_, err = dler.Download(context.TODO(), fout, &s3.GetObjectInput{
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Bucket: aws.String(bucketName),
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Key: aws.String(d.SHA256Sum),
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})
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if err != nil {
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fout.Close()
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t.Fatalf("can't get s3://%s/%s: %v", bucketName, d.SHA256Sum, err)
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}
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err = fout.Close()
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if err != nil {
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t.Fatalf("can't close fout: %v", err)
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}
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return true
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}
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// fetchDistro fetches a distribution from the internet if it doesn't already exist locally. It
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// also validates the sha256 sum from a known good hash.
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func fetchDistro(t *testing.T, resultDistro Distro) string {
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t.Helper()
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cdir, err := os.UserCacheDir()
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if err != nil {
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t.Fatalf("can't find cache dir: %v", err)
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}
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cdir = filepath.Join(cdir, "tailscale", "vm-test")
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qcowPath := filepath.Join(cdir, "qcow2", resultDistro.SHA256Sum)
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if _, err = os.Stat(qcowPath); err == nil {
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hash := checkCachedImageHash(t, resultDistro, cdir)
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if hash == resultDistro.SHA256Sum {
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return qcowPath
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}
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t.Logf("hash for %s (%s) doesn't match expected %s, re-downloading", resultDistro.Name, qcowPath, resultDistro.SHA256Sum)
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if err := os.Remove(qcowPath); err != nil {
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t.Fatalf("can't delete wrong cached image: %v", err)
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}
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}
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t.Logf("downloading distro image %s to %s", resultDistro.URL, qcowPath)
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if err := os.MkdirAll(filepath.Dir(qcowPath), 0777); err != nil {
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t.Fatal(err)
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}
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fout, err := os.Create(qcowPath)
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if err != nil {
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t.Fatal(err)
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}
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if !fetchFromS3(t, fout, resultDistro) {
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resp, err := http.Get(resultDistro.URL)
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if err != nil {
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t.Fatalf("can't fetch qcow2 for %s (%s): %v", resultDistro.Name, resultDistro.URL, err)
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}
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if resp.StatusCode != http.StatusOK {
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resp.Body.Close()
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t.Fatalf("%s replied %s", resultDistro.URL, resp.Status)
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}
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if n, err := io.Copy(fout, resp.Body); err != nil {
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t.Fatalf("download of %s failed: %v", resultDistro.URL, err)
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} else if n == 0 {
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t.Fatalf("download of %s got zero-length file", resultDistro.URL)
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}
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resp.Body.Close()
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if err = fout.Close(); err != nil {
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t.Fatalf("can't close fout: %v", err)
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}
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hash := checkCachedImageHash(t, resultDistro, cdir)
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if hash != resultDistro.SHA256Sum {
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t.Fatalf("hash mismatch for %s, want: %s, got: %s", resultDistro.URL, resultDistro.SHA256Sum, hash)
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}
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}
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return qcowPath
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}
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func checkCachedImageHash(t *testing.T, d Distro, cacheDir string) string {
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t.Helper()
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qcowPath := filepath.Join(cacheDir, "qcow2", d.SHA256Sum)
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fin, err := os.Open(qcowPath)
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if err != nil {
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t.Fatal(err)
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}
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defer fin.Close()
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hasher := sha256.New()
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if _, err := io.Copy(hasher, fin); err != nil {
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t.Fatal(err)
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}
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hash := hex.EncodeToString(hasher.Sum(nil))
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if hash != d.SHA256Sum {
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t.Fatalf("hash mismatch, got: %q, want: %q", hash, d.SHA256Sum)
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}
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return hash
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}
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func (h *Harness) copyBinaries(t *testing.T, d Distro, conn *ssh.Client) {
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if strings.HasPrefix(d.Name, "nixos") {
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return
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}
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cli, err := sftp.NewClient(conn)
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if err != nil {
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t.Fatalf("can't connect over sftp to copy binaries: %v", err)
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}
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mkdir(t, cli, "/usr/bin")
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mkdir(t, cli, "/usr/sbin")
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mkdir(t, cli, "/etc/default")
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mkdir(t, cli, "/var/lib/tailscale")
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copyFile(t, cli, h.daemon, "/usr/sbin/tailscaled")
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copyFile(t, cli, h.cli, "/usr/bin/tailscale")
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// TODO(Xe): revisit this assumption before it breaks the test.
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copyFile(t, cli, "../../../cmd/tailscaled/tailscaled.defaults", "/etc/default/tailscaled")
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switch d.InitSystem {
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case "openrc":
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mkdir(t, cli, "/etc/init.d")
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copyFile(t, cli, "../../../cmd/tailscaled/tailscaled.openrc", "/etc/init.d/tailscaled")
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case "systemd":
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mkdir(t, cli, "/etc/systemd/system")
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copyFile(t, cli, "../../../cmd/tailscaled/tailscaled.service", "/etc/systemd/system/tailscaled.service")
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}
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fout, err := cli.OpenFile("/etc/default/tailscaled", os.O_WRONLY|os.O_APPEND)
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if err != nil {
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t.Fatalf("can't append to defaults for tailscaled: %v", err)
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}
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fmt.Fprintf(fout, "\n\nTS_LOG_TARGET=%s\n", h.loginServerURL)
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fout.Close()
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t.Log("tailscale installed!")
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}
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func mkdir(t *testing.T, cli *sftp.Client, name string) {
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t.Helper()
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err := cli.MkdirAll(name)
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if err != nil {
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t.Fatalf("can't make %s: %v", name, err)
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}
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}
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func copyFile(t *testing.T, cli *sftp.Client, localSrc, remoteDest string) {
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t.Helper()
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fin, err := os.Open(localSrc)
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if err != nil {
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t.Fatalf("can't open: %v", err)
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}
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defer fin.Close()
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fi, err := fin.Stat()
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if err != nil {
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t.Fatalf("can't stat: %v", err)
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}
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fout, err := cli.Create(remoteDest)
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if err != nil {
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t.Fatalf("can't create output file: %v", err)
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}
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err = fout.Chmod(fi.Mode())
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if err != nil {
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fout.Close()
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t.Fatalf("can't chmod fout: %v", err)
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}
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n, err := io.Copy(fout, fin)
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if err != nil {
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fout.Close()
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t.Fatalf("copy failed: %v", err)
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}
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if fi.Size() != n {
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t.Fatalf("incorrect number of bytes copied: wanted: %d, got: %d", fi.Size(), n)
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}
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err = fout.Close()
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if err != nil {
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t.Fatalf("can't close fout on remote host: %v", err)
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}
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}
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const metaDataTemplate = `instance-id: {{.ID}}
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local-hostname: {{.Hostname}}`
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const userDataTemplate = `#cloud-config
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#vim:syntax=yaml
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cloud_config_modules:
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- runcmd
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cloud_final_modules:
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- [users-groups, always]
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- [scripts-user, once-per-instance]
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users:
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- name: root
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ssh-authorized-keys:
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- {{.SSHKey}}
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- name: ts
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plain_text_passwd: {{.Password}}
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groups: [ wheel ]
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sudo: [ "ALL=(ALL) NOPASSWD:ALL" ]
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shell: /bin/sh
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ssh-authorized-keys:
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- {{.SSHKey}}
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write_files:
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- path: /etc/cloud/cloud.cfg.d/80_disable_network_after_firstboot.cfg
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content: |
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# Disable network configuration after first boot
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network:
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config: disabled
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runcmd:
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{{.InstallPre}}
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- [ curl, "{{.HostURL}}/myip/{{.Port}}", "-H", "User-Agent: {{.Hostname}}" ]
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`
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