tsnet: add Tailscale-as-a-library package
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
Brad Fitzpatrick
parent
6f62bbae79
commit
5b52b64094
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@ -0,0 +1,43 @@
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// 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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// The tshello server demonstrates how to use Tailscale as a library.
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package main
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import (
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"fmt"
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"html"
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"log"
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"net/http"
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"strings"
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"tailscale.com/tsnet"
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)
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func main() {
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s := new(tsnet.Server)
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ln, err := s.Listen("tcp", ":80")
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if err != nil {
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log.Fatal(err)
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}
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log.Fatal(http.Serve(ln, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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who, ok := s.WhoIs(r.RemoteAddr)
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if !ok {
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http.Error(w, "WhoIs failed", 500)
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return
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}
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fmt.Fprintf(w, "<html><body><h1>Hello, world!</h1>\n")
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fmt.Fprintf(w, "<p>You are <b>%s</b> from <b>%s</b> (%s)</p>",
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html.EscapeString(who.UserProfile.LoginName),
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html.EscapeString(firstLabel(who.Node.ComputedName)),
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r.RemoteAddr)
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})))
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}
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func firstLabel(s string) string {
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if i := strings.Index(s, "."); i != -1 {
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return s[:i]
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}
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return s
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}
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@ -0,0 +1,274 @@
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// 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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// Package tsnet provides Tailscale as a library.
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//
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// It is an experimental work in progress.
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package tsnet
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import (
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"errors"
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"fmt"
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"log"
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"net"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"sync"
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"time"
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"inet.af/netaddr"
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"tailscale.com/client/tailscale/apitype"
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"tailscale.com/control/controlclient"
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"tailscale.com/ipn"
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"tailscale.com/ipn/ipnlocal"
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"tailscale.com/smallzstd"
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"tailscale.com/types/logger"
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"tailscale.com/wgengine"
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"tailscale.com/wgengine/monitor"
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"tailscale.com/wgengine/netstack"
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)
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// Server is an embedded Tailscale server.
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//
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// Its exported fields may be changed until the first call to Listen.
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type Server struct {
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// Dir specifies the name of the directory to use for
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// state. If empty, a directory is selected automatically
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// under os.UserConfigDir (https://golang.org/pkg/os/#UserConfigDir).
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// based on the name of the binary.
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Dir string
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// Hostname is the hostname to present to the control server.
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// If empty, the binary name is used.l
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Hostname string
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// Logf, if non-nil, specifies the logger to use. By default,
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// log.Printf is used.
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Logf logger.Logf
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initOnce sync.Once
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initErr error
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lb *ipnlocal.LocalBackend
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// the state directory
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dir string
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hostname string
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mu sync.Mutex
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listeners map[listenKey]*listener
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}
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// WhoIs reports the node and user who owns the node with the given
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// address. The addr may be an ip:port (as from an
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// http.Request.RemoteAddr) or just an IP address.
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func (s *Server) WhoIs(addr string) (w *apitype.WhoIsResponse, ok bool) {
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ipp, err := netaddr.ParseIPPort(addr)
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if err != nil {
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ip, err := netaddr.ParseIP(addr)
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if err != nil {
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return nil, false
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}
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ipp.IP = ip
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}
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n, up, ok := s.lb.WhoIs(ipp)
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if !ok {
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return nil, false
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}
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return &apitype.WhoIsResponse{
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Node: n,
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UserProfile: &up,
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}, true
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}
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func (s *Server) doInit() {
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if err := s.start(); err != nil {
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s.initErr = fmt.Errorf("tsnet: %w", err)
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}
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}
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func (s *Server) start() error {
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if v, _ := strconv.ParseBool(os.Getenv("TAILSCALE_USE_WIP_CODE")); !v {
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return errors.New("code disabled without environment variable TAILSCALE_USE_WIP_CODE set true")
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}
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exe, err := os.Executable()
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if err != nil {
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return err
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}
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prog := strings.TrimSuffix(strings.ToLower(filepath.Base(exe)), ".exe")
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s.hostname = s.Hostname
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if s.hostname == "" {
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s.hostname = prog
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}
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s.dir = s.Dir
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if s.dir == "" {
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confDir, err := os.UserConfigDir()
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if err != nil {
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return err
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}
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s.dir = filepath.Join(confDir, "tslib-"+prog)
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if err := os.MkdirAll(s.dir, 0700); err != nil {
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return err
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}
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}
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if fi, err := os.Stat(s.dir); err != nil {
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return err
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} else if !fi.IsDir() {
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return fmt.Errorf("%v is not a directory", s.dir)
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}
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logf := s.Logf
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if logf == nil {
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logf = log.Printf
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}
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// TODO(bradfitz): start logtail? don't use filch, perhaps?
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// only upload plumbed Logf?
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linkMon, err := monitor.New(logf)
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if err != nil {
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return err
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}
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eng, err := wgengine.NewUserspaceEngine(logf, wgengine.Config{
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ListenPort: 0,
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LinkMonitor: linkMon,
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})
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if err != nil {
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return err
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}
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tunDev, magicConn, ok := eng.(wgengine.InternalsGetter).GetInternals()
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if !ok {
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return fmt.Errorf("%T is not a wgengine.InternalsGetter", eng)
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}
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ns, err := netstack.Create(logf, tunDev, eng, magicConn, false)
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if err != nil {
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return fmt.Errorf("netstack.Create: %w", err)
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}
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ns.ForwardTCPIn = s.forwardTCP
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if err := ns.Start(); err != nil {
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return fmt.Errorf("failed to start netstack: %w", err)
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}
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statePath := filepath.Join(s.dir, "tailscaled.state")
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store, err := ipn.NewFileStore(statePath)
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if err != nil {
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return err
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}
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logid := "tslib-TODO"
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lb, err := ipnlocal.NewLocalBackend(logf, logid, store, eng)
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if err != nil {
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return fmt.Errorf("NewLocalBackend: %v", err)
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}
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s.lb = lb
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lb.SetDecompressor(func() (controlclient.Decompressor, error) {
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return smallzstd.NewDecoder(nil)
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})
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prefs := ipn.NewPrefs()
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prefs.Hostname = s.hostname
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prefs.WantRunning = true
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err = lb.Start(ipn.Options{
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StateKey: ipn.GlobalDaemonStateKey,
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UpdatePrefs: prefs,
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})
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if err != nil {
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return fmt.Errorf("starting backend: %w", err)
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}
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if os.Getenv("TS_LOGIN") == "1" {
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s.lb.StartLoginInteractive()
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}
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return nil
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}
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func (s *Server) forwardTCP(c net.Conn, port uint16) {
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s.mu.Lock()
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ln, ok := s.listeners[listenKey{"tcp", "", fmt.Sprint(port)}]
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s.mu.Unlock()
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if !ok {
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c.Close()
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return
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}
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t := time.NewTimer(time.Second)
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defer t.Stop()
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select {
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case ln.conn <- c:
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case <-t.C:
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c.Close()
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}
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}
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func (s *Server) Listen(network, addr string) (net.Listener, error) {
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host, port, err := net.SplitHostPort(addr)
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if err != nil {
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return nil, fmt.Errorf("tsnet: %w", err)
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}
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s.initOnce.Do(s.doInit)
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if s.initErr != nil {
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return nil, s.initErr
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}
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key := listenKey{network, host, port}
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ln := &listener{
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s: s,
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key: key,
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addr: addr,
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conn: make(chan net.Conn),
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}
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s.mu.Lock()
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if s.listeners == nil {
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s.listeners = map[listenKey]*listener{}
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}
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if _, ok := s.listeners[key]; ok {
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s.mu.Unlock()
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return nil, fmt.Errorf("tsnet: listener already open for %s, %s", network, addr)
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}
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s.listeners[key] = ln
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s.mu.Unlock()
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return ln, nil
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}
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type listenKey struct {
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network string
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host string
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port string
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}
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type listener struct {
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s *Server
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key listenKey
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addr string
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conn chan net.Conn
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}
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func (ln *listener) Accept() (net.Conn, error) {
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c, ok := <-ln.conn
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if !ok {
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return nil, fmt.Errorf("tsnet: %w", net.ErrClosed)
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}
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return c, nil
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}
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func (ln *listener) Addr() net.Addr { return addr{ln} }
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func (ln *listener) Close() error {
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ln.s.mu.Lock()
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defer ln.s.mu.Unlock()
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if v, ok := ln.s.listeners[ln.key]; ok && v == ln {
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delete(ln.s.listeners, ln.key)
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close(ln.conn)
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}
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return nil
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}
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type addr struct{ ln *listener }
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func (a addr) Network() string { return a.ln.key.network }
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func (a addr) String() string { return a.ln.addr }
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@ -48,6 +48,12 @@ const debugNetstack = false
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// and implements wgengine.FakeImpl to act as a userspace network
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// stack when Tailscale is running in fake mode.
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type Impl struct {
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// ForwardTCPIn, if non-nil, handles forwarding an inbound TCP
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// connection.
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// TODO(bradfitz): provide mechanism for tsnet to reject a
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// port other than accepting it and closing it.
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ForwardTCPIn func(c net.Conn, port uint16)
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ipstack *stack.Stack
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linkEP *channel.Endpoint
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tundev *tstun.Wrapper
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@ -441,11 +447,15 @@ func (ns *Impl) acceptTCP(r *tcp.ForwarderRequest) {
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r.Complete(true)
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return
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}
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r.Complete(false)
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c := gonet.NewTCPConn(&wq, ep)
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if ns.ForwardTCPIn != nil {
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ns.ForwardTCPIn(c, reqDetails.LocalPort)
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return
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}
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if isTailscaleIP {
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dialAddr = tcpip.Address(net.ParseIP("127.0.0.1")).To4()
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}
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r.Complete(false)
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c := gonet.NewTCPConn(&wq, ep)
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ns.forwardTCP(c, &wq, dialAddr, reqDetails.LocalPort)
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}
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