2018-05-13 04:58:15 +00:00
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package tor
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import (
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"context"
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2018-05-14 18:11:18 +00:00
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"fmt"
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2018-05-13 04:58:15 +00:00
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"io"
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2018-05-14 18:11:18 +00:00
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"io/ioutil"
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"net/textproto"
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"os"
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"strconv"
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"time"
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"github.com/cretz/bine/control"
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"github.com/cretz/bine/process"
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2018-05-13 04:58:15 +00:00
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)
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type Tor struct {
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Process process.Process
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Control *control.Conn
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ProcessCancelFunc context.CancelFunc
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ControlPort int
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DataDir string
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DeleteDataDirOnClose bool
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DebugWriter io.Writer
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2018-05-13 04:58:15 +00:00
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}
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type StartConf struct {
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// TODO: docs...Empty string means just "tor" either locally or on PATH
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ExePath string
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// TODO: docs...If true, doesn't use exe path, uses statically compiled Tor
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Embedded bool
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// TODO: docs...If 0, Tor is asked to store the control port in a temporary file in the data directory
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ControlPort int
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// TODO: docs...If not empty, this is the data directory used and *TempDataDir* fields are unused
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DataDir string
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// TODO: docs...by default we do cookie auth, this disables it
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DisableCookieAuth bool
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// TODO: docs...by default this authenticates
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DisableEagerAuth bool
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// TODO: docs...by default network is disabled
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EnableNetwork bool
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// TODO: docs...If not empty, this is the parent directory that a child dir is created for data. If empty, the
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// current dir is assumed. This has no effect if DataDir is set.
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TempDataDirBase string
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// TODO: docs...If true the temporary data dir is not deleted on close. This has no effect if DataDir is set.
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RetainTempDataDir bool
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// TODO: docs...Any extra CLI arguments to pass to Tor. This are applied after other CLI args.
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ExtraArgs []string
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// TODO: docs...If not present, a blank torrc file is placed in the data dir and used
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TorrcFile string
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// TODO: docs...
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DebugWriter io.Writer
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}
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2018-05-14 18:11:18 +00:00
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// TODO: docs...conf can be nil for defaults, note on error the process could still be running
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func Start(ctx context.Context, conf *StartConf) (*Tor, error) {
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if ctx == nil {
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ctx = context.Background()
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}
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if conf == nil {
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conf = &StartConf{}
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}
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tor := &Tor{DataDir: conf.DataDir, DebugWriter: conf.DebugWriter}
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// Create the data dir
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if tor.DataDir == "" {
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tempBase := conf.TempDataDirBase
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if tempBase == "" {
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tempBase = "."
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}
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var err error
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if tor.DataDir, err = ioutil.TempDir(tempBase, "data-dir-"); err != nil {
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return nil, fmt.Errorf("Unable to create temp data dir: %v", err)
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}
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tor.Debugf("Created temp data directory at: %v", tor.DataDir)
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tor.DeleteDataDirOnClose = !conf.RetainTempDataDir
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} else if err := os.MkdirAll(tor.DataDir, 0600); err != nil {
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return nil, fmt.Errorf("Unable to create data dir: %v", err)
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}
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// From this point on, we must close tor if we error
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// Start tor
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err := tor.startProcess(ctx, conf)
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// Connect the controller
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if err == nil {
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err = tor.connectController(ctx, conf)
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}
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// Attempt eager auth w/ no password
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if err == nil && !conf.DisableEagerAuth {
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err = tor.Control.Authenticate("")
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}
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// If there was an error, we have to try to close here but it may leave the process open
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if err != nil {
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if closeErr := tor.Close(); closeErr != nil {
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err = fmt.Errorf("Error on start: %v (also got error trying to close: %v)", err, closeErr)
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}
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}
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return tor, err
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}
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func (t *Tor) startProcess(ctx context.Context, conf *StartConf) error {
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// Get the creator
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var creator process.Creator
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if conf.Embedded {
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return fmt.Errorf("Embedded Tor not yet supported")
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} else {
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torPath := conf.ExePath
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if torPath == "" {
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torPath = "tor"
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}
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creator = process.NewCreator(torPath)
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}
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// Build the args
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args := []string{"--DataDirectory", t.DataDir}
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if !conf.DisableCookieAuth {
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args = append(args, "--CookieAuthentication", "1")
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}
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if !conf.EnableNetwork {
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args = append(args, "--DisableNetwork", "1")
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}
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// If there is no Torrc file, create a blank temp one
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torrcFileName := conf.TorrcFile
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if torrcFileName == "" {
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torrcFile, err := ioutil.TempFile(t.DataDir, "torrc-")
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if err != nil {
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return err
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}
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torrcFileName = torrcFile.Name()
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if err = torrcFile.Close(); err != nil {
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return err
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}
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}
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args = append(args, "-f", torrcFileName)
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// Create file for Tor to write the control port to if it's not told to us
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var controlPortFileName string
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var err error
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if conf.ControlPort == 0 {
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controlPortFile, err := ioutil.TempFile(t.DataDir, "control-port-")
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if err != nil {
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return err
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}
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controlPortFileName = controlPortFile.Name()
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if err = controlPortFile.Close(); err != nil {
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return err
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}
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args = append(args, "--ControlPort", "auto", "--ControlPortWriteToFile", controlPortFile.Name())
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}
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// Start process with the args
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var processCtx context.Context
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processCtx, t.ProcessCancelFunc = context.WithCancel(ctx)
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args = append(args, conf.ExtraArgs...)
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p, err := creator.New(processCtx, args...)
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if err != nil {
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return err
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}
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t.Debugf("Starting tor with args %v", args)
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if err = p.Start(); err != nil {
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return err
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}
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t.Process = p
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// Try a few times to read the control port file if we need to
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t.ControlPort = conf.ControlPort
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if t.ControlPort == 0 {
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ControlPortCheck:
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for i := 0; i < 10; i++ {
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select {
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case <-ctx.Done():
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err = ctx.Err()
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break ControlPortCheck
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default:
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// Try to read the controlport file, or wait a bit
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var byts []byte
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if byts, err = ioutil.ReadFile(controlPortFileName); err != nil {
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break ControlPortCheck
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} else if t.ControlPort, err = process.ControlPortFromFileContents(string(byts)); err == nil {
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break ControlPortCheck
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}
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time.Sleep(200 * time.Millisecond)
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}
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}
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if err != nil {
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return fmt.Errorf("Unable to read control port file: %v", err)
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}
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}
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return nil
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}
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2018-05-14 18:11:18 +00:00
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func (t *Tor) connectController(ctx context.Context, conf *StartConf) error {
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t.Debugf("Connecting to control port %v", t.ControlPort)
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textConn, err := textproto.Dial("tcp", "127.0.0.1:"+strconv.Itoa(t.ControlPort))
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if err != nil {
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return err
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}
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t.Control = control.NewConn(textConn)
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t.Control.DebugWriter = t.DebugWriter
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return nil
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}
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2018-05-14 18:11:18 +00:00
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func (t *Tor) Close() error {
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errs := []error{}
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// If controller is authenticated, send the quit signal to the process. Otherwise, just close the controller.
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sentHalt := false
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if t.Control != nil {
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if t.Control.Authenticated {
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if err := t.Control.Signal("HALT"); err != nil {
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errs = append(errs, fmt.Errorf("Unable to signal halt: %v", err))
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} else {
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sentHalt = true
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}
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}
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// Now close the controller
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if err := t.Control.Close(); err != nil {
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errs = append(errs, fmt.Errorf("Unable to close contrlller: %v", err))
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} else {
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t.Control = nil
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}
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}
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if t.Process != nil {
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// If we didn't halt, we have to force kill w/ the cancel func
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if !sentHalt {
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t.ProcessCancelFunc()
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}
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// Wait for a bit to make sure it stopped
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errCh := make(chan error, 1)
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var waitErr error
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go func() { errCh <- t.Process.Wait() }()
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select {
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case waitErr = <-errCh:
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if waitErr != nil {
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errs = append(errs, fmt.Errorf("Process wait failed: %v", waitErr))
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}
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case <-time.After(300 * time.Millisecond):
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errs = append(errs, fmt.Errorf("Process did not exit after 300 ms"))
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}
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if waitErr == nil {
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t.Process = nil
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}
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}
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// Get rid of the entire data dir
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if t.DeleteDataDirOnClose {
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if err := os.RemoveAll(t.DataDir); err != nil {
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errs = append(errs, fmt.Errorf("Failed to remove data dir %v: %v", t.DataDir, err))
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}
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}
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// Combine the errors if present
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if len(errs) == 0 {
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return nil
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} else if len(errs) == 1 {
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return errs[0]
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}
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return fmt.Errorf("Got %v errors while closing - %v", len(errs), errs)
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2018-05-13 04:58:15 +00:00
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}
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