package updater import ( "context" "fmt" "os" "path/filepath" "runtime" "time" "github.com/facebookgo/grace/gracenet" "github.com/rs/zerolog" "github.com/urfave/cli/v2" "golang.org/x/crypto/ssh/terminal" "github.com/cloudflare/cloudflared/config" "github.com/cloudflare/cloudflared/logger" ) const ( DefaultCheckUpdateFreq = time.Hour * 24 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" UpdateURL = "https://update.argotunnel.com" StagingUpdateURL = "https://staging-update.argotunnel.com" LogFieldVersion = "version" ) var ( version string ) // BinaryUpdated implements ExitCoder interface, the app will exit with status code 11 // https://pkg.go.dev/github.com/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 updateOptions struct { updateDisabled bool isBeta bool isStaging bool isForced bool intendedVersion string } type UpdateOutcome struct { Updated bool Version string UserMessage string Error error } func (uo *UpdateOutcome) noUpdate() bool { return uo.Error == nil && uo.Updated == false } func Init(v string) { version = v } func CheckForUpdate(options updateOptions) (CheckResult, error) { cfdPath, err := os.Executable() if err != nil { return nil, err } url := UpdateURL if options.isStaging { url = StagingUpdateURL } s := NewWorkersService(version, url, cfdPath, Options{IsBeta: options.isBeta, IsForced: options.isForced, RequestedVersion: options.intendedVersion}) return s.Check() } func applyUpdate(options updateOptions, update CheckResult) UpdateOutcome { if update.Version() == "" || options.updateDisabled { return UpdateOutcome{UserMessage: update.UserMessage()} } err := update.Apply() if err != nil { return UpdateOutcome{Error: err} } return UpdateOutcome{Updated: true, Version: update.Version(), UserMessage: update.UserMessage()} } // Update is the handler for the update command from the command line func Update(c *cli.Context) error { log := logger.CreateLoggerFromContext(c, logger.EnableTerminalLog) if wasInstalledFromPackageManager() { log.Error().Msg("cloudflared was installed by a package manager. Please update using the same method.") return nil } isBeta := c.Bool("beta") if isBeta { log.Info().Msg("cloudflared is set to update to the latest beta version") } isStaging := c.Bool("staging") if isStaging { log.Info().Msg("cloudflared is set to update from staging") } isForced := c.Bool("force") if isForced { log.Info().Msg("cloudflared is set to upgrade to the latest publish version regardless of the current version") } updateOutcome := loggedUpdate(log, updateOptions{ updateDisabled: false, isBeta: isBeta, isStaging: isStaging, isForced: isForced, intendedVersion: c.String("version"), }) if updateOutcome.Error != nil { return &statusErr{updateOutcome.Error} } if updateOutcome.noUpdate() { log.Info().Str(LogFieldVersion, updateOutcome.Version).Msg("cloudflared is up to date") return nil } return &statusSuccess{newVersion: updateOutcome.Version} } // Checks for an update and applies it if one is available func loggedUpdate(log *zerolog.Logger, options updateOptions) UpdateOutcome { checkResult, err := CheckForUpdate(options) if err != nil { log.Err(err).Msg("update check failed") return UpdateOutcome{Error: err} } updateOutcome := applyUpdate(options, checkResult) if updateOutcome.Updated { log.Info().Str(LogFieldVersion, updateOutcome.Version).Msg("cloudflared has been updated") } if updateOutcome.Error != nil { log.Err(updateOutcome.Error).Msg("update failed to apply") } return updateOutcome } // AutoUpdater periodically checks for new version of cloudflared. type AutoUpdater struct { configurable *configurable listeners *gracenet.Net updateConfigChan chan *configurable log *zerolog.Logger } // AutoUpdaterConfigurable is the attributes of AutoUpdater that can be reconfigured during runtime type configurable struct { enabled bool freq time.Duration } func NewAutoUpdater(updateDisabled bool, freq time.Duration, listeners *gracenet.Net, log *zerolog.Logger) *AutoUpdater { return &AutoUpdater{ configurable: createUpdateConfig(updateDisabled, freq, log), listeners: listeners, updateConfigChan: make(chan *configurable), log: log, } } func createUpdateConfig(updateDisabled bool, freq time.Duration, log *zerolog.Logger) *configurable { if isAutoupdateEnabled(log, updateDisabled, freq) { log.Info().Dur("autoupdateFreq", freq).Msg("Autoupdate frequency is set") return &configurable{ enabled: true, freq: freq, } } else { return &configurable{ enabled: false, freq: DefaultCheckUpdateFreq, } } } func (a *AutoUpdater) Run(ctx context.Context) error { ticker := time.NewTicker(a.configurable.freq) for { updateOutcome := loggedUpdate(a.log, updateOptions{updateDisabled: !a.configurable.enabled}) if updateOutcome.Updated { Init(updateOutcome.Version) if IsSysV() { // SysV doesn't have a mechanism to keep service alive, we have to restart the process a.log.Info().Msg("Restarting service managed by SysV...") pid, err := a.listeners.StartProcess() if err != nil { a.log.Err(err).Msg("Unable to restart server automatically") return &statusErr{err: err} } // stop old process after autoupdate. Otherwise we create a new process // after each update a.log.Info().Msgf("PID of the new process is %d", pid) } return &statusSuccess{newVersion: updateOutcome.Version} } else if updateOutcome.UserMessage != "" { a.log.Warn().Msg(updateOutcome.UserMessage) } 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(updateDisabled bool, newFreq time.Duration) { a.updateConfigChan <- createUpdateConfig(updateDisabled, newFreq, a.log) } func isAutoupdateEnabled(log *zerolog.Logger, updateDisabled bool, updateFreq time.Duration) bool { if !supportAutoUpdate(log) { return false } return !updateDisabled && updateFreq != 0 } func supportAutoUpdate(log *zerolog.Logger) bool { if runtime.GOOS == "windows" { log.Info().Msg(noUpdateOnWindowsMessage) return false } if wasInstalledFromPackageManager() { log.Info().Msg(noUpdateManagedPackageMessage) return false } if isRunningFromTerminal() { log.Info().Msg(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 }