cloudflared-mirror/cmd/cloudflared/updater/update.go

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package updater
import (
"context"
"fmt"
"os"
"path/filepath"
"runtime"
"time"
"golang.org/x/crypto/ssh/terminal"
"gopkg.in/urfave/cli.v2"
"github.com/cloudflare/cloudflared/cmd/cloudflared/config"
"github.com/cloudflare/cloudflared/logger"
"github.com/equinox-io/equinox"
"github.com/facebookgo/grace/gracenet"
"github.com/pkg/errors"
)
const (
DefaultCheckUpdateFreq = time.Hour * 24
appID = "app_idCzgxYerVD"
noUpdateInShellMessage = "cloudflared will not automatically update when run from the shell. To enable auto-updates, run cloudflared as a service: https://developers.cloudflare.com/argo-tunnel/reference/service/"
noUpdateOnWindowsMessage = "cloudflared will not automatically update on Windows systems."
noUpdateManagedPackageMessage = "cloudflared will not automatically update if installed by a package manager."
isManagedInstallFile = ".installedFromPackageManager"
)
var (
publicKey = []byte(`
-----BEGIN ECDSA PUBLIC KEY-----
MHYwEAYHKoZIzj0CAQYFK4EEACIDYgAE4OWZocTVZ8Do/L6ScLdkV+9A0IYMHoOf
dsCmJ/QZ6aw0w9qkkwEpne1Lmo6+0pGexZzFZOH6w5amShn+RXt7qkSid9iWlzGq
EKx0BZogHSor9Wy5VztdFaAaVbsJiCbO
-----END ECDSA PUBLIC KEY-----
`)
)
// BinaryUpdated implements ExitCoder interface, the app will exit with status code 11
// https://pkg.go.dev/gopkg.in/urfave/cli.v2?tab=doc#ExitCoder
type statusSuccess struct {
newVersion string
}
func (u *statusSuccess) Error() string {
return fmt.Sprintf("cloudflared has been updated to version %s", u.newVersion)
}
func (u *statusSuccess) ExitCode() int {
return 11
}
// UpdateErr implements ExitCoder interface, the app will exit with status code 10
type statusErr struct {
err error
}
func (e *statusErr) Error() string {
return fmt.Sprintf("failed to update cloudflared: %v", e.err)
}
func (e *statusErr) ExitCode() int {
return 10
}
type UpdateOutcome struct {
Updated bool
Version string
Error error
}
func (uo *UpdateOutcome) noUpdate() bool {
return uo.Error == nil && uo.Updated == false
}
func checkForUpdateAndApply() UpdateOutcome {
var opts equinox.Options
if err := opts.SetPublicKeyPEM(publicKey); err != nil {
return UpdateOutcome{Error: err}
}
resp, err := equinox.Check(appID, opts)
switch {
case err == equinox.NotAvailableErr:
return UpdateOutcome{}
case err != nil:
return UpdateOutcome{Error: err}
}
err = resp.Apply()
if err != nil {
return UpdateOutcome{Error: err}
}
return UpdateOutcome{Updated: true, Version: resp.ReleaseVersion}
}
func Update(_ *cli.Context) error {
logger, err := logger.New()
if err != nil {
return errors.Wrap(err, "error setting up logger")
}
if wasInstalledFromPackageManager() {
logger.Error("cloudflared was installed by a package manager. Please update using the same method.")
return nil
}
updateOutcome := loggedUpdate(logger)
if updateOutcome.Error != nil {
return &statusErr{updateOutcome.Error}
}
if updateOutcome.noUpdate() {
logger.Infof("cloudflared is up to date (%s)", updateOutcome.Version)
return nil
}
return &statusSuccess{newVersion: updateOutcome.Version}
}
// Checks for an update and applies it if one is available
func loggedUpdate(logger logger.Service) UpdateOutcome {
updateOutcome := checkForUpdateAndApply()
if updateOutcome.Updated {
logger.Infof("cloudflared has been updated to version %s", updateOutcome.Version)
}
if updateOutcome.Error != nil {
logger.Errorf("update check failed: %s", updateOutcome.Error)
}
return updateOutcome
}
// AutoUpdater periodically checks for new version of cloudflared.
type AutoUpdater struct {
configurable *configurable
listeners *gracenet.Net
updateConfigChan chan *configurable
logger logger.Service
}
// AutoUpdaterConfigurable is the attributes of AutoUpdater that can be reconfigured during runtime
type configurable struct {
enabled bool
freq time.Duration
}
func NewAutoUpdater(freq time.Duration, listeners *gracenet.Net, logger logger.Service) *AutoUpdater {
updaterConfigurable := &configurable{
enabled: true,
freq: freq,
}
if freq == 0 {
updaterConfigurable.enabled = false
updaterConfigurable.freq = DefaultCheckUpdateFreq
}
return &AutoUpdater{
configurable: updaterConfigurable,
listeners: listeners,
updateConfigChan: make(chan *configurable),
logger: logger,
}
}
func (a *AutoUpdater) Run(ctx context.Context) error {
ticker := time.NewTicker(a.configurable.freq)
for {
if a.configurable.enabled {
updateOutcome := loggedUpdate(a.logger)
if updateOutcome.Updated {
os.Args = append(os.Args, "--is-autoupdated=true")
if IsSysV() {
// SysV doesn't have a mechanism to keep service alive, we have to restart the process
a.logger.Info("Restarting service managed by SysV...")
pid, err := a.listeners.StartProcess()
if err != nil {
a.logger.Errorf("Unable to restart server automatically: %s", err)
return &statusErr{err: err}
}
// stop old process after autoupdate. Otherwise we create a new process
// after each update
a.logger.Infof("PID of the new process is %d", pid)
}
return &statusSuccess{newVersion: updateOutcome.Version}
}
}
select {
case <-ctx.Done():
return ctx.Err()
case newConfigurable := <-a.updateConfigChan:
ticker.Stop()
a.configurable = newConfigurable
ticker = time.NewTicker(a.configurable.freq)
// Check if there is new version of cloudflared after receiving new AutoUpdaterConfigurable
case <-ticker.C:
}
}
}
// Update is the method to pass new AutoUpdaterConfigurable to a running AutoUpdater. It is safe to be called concurrently
func (a *AutoUpdater) Update(newFreq time.Duration) {
newConfigurable := &configurable{
enabled: true,
freq: newFreq,
}
// A ero duration means autoupdate is disabled
if newFreq == 0 {
newConfigurable.enabled = false
newConfigurable.freq = DefaultCheckUpdateFreq
}
a.updateConfigChan <- newConfigurable
}
func IsAutoupdateEnabled(c *cli.Context, l logger.Service) bool {
if !SupportAutoUpdate(l) {
return false
}
return !c.Bool("no-autoupdate") && c.Duration("autoupdate-freq") != 0
}
func SupportAutoUpdate(logger logger.Service) bool {
if runtime.GOOS == "windows" {
logger.Info(noUpdateOnWindowsMessage)
return false
}
if wasInstalledFromPackageManager() {
logger.Info(noUpdateManagedPackageMessage)
return false
}
if isRunningFromTerminal() {
logger.Info(noUpdateInShellMessage)
return false
}
return true
}
func wasInstalledFromPackageManager() bool {
ok, _ := config.FileExists(filepath.Join(config.DefaultUnixConfigLocation, isManagedInstallFile))
return ok
}
func isRunningFromTerminal() bool {
return terminal.IsTerminal(int(os.Stdout.Fd()))
}
func IsSysV() bool {
if runtime.GOOS != "linux" {
return false
}
if _, err := os.Stat("/run/systemd/system"); err == nil {
return false
}
return true
}