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file.go
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file.go
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// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package cli
import (
"bytes"
"context"
"errors"
"flag"
"fmt"
"io"
"log"
"mime"
"net/http"
"os"
"path/filepath"
"strings"
"time"
"unicode/utf8"
"github.com/peterbourgon/ff/v3/ffcli"
"golang.org/x/time/rate"
"inet.af/netaddr"
"tailscale.com/client/tailscale"
"tailscale.com/client/tailscale/apitype"
"tailscale.com/envknob"
"tailscale.com/ipn"
"tailscale.com/net/tsaddr"
"tailscale.com/tailcfg"
"tailscale.com/version"
)
var fileCmd = &ffcli.Command{
Name: "file",
ShortUsage: "file <cp|get> ...",
ShortHelp: "Send or receive files",
Subcommands: []*ffcli.Command{
fileCpCmd,
fileGetCmd,
},
Exec: func(context.Context, []string) error {
// TODO(bradfitz): is there a better ffcli way to
// annotate subcommand-required commands that don't
// have an exec body of their own?
return errors.New("file subcommand required; run 'tailscale file -h' for details")
},
}
var fileCpCmd = &ffcli.Command{
Name: "cp",
ShortUsage: "file cp <files...> <target>:",
ShortHelp: "Copy file(s) to a host",
Exec: runCp,
FlagSet: (func() *flag.FlagSet {
fs := newFlagSet("cp")
fs.StringVar(&cpArgs.name, "name", "", "alternate filename to use, especially useful when <file> is \"-\" (stdin)")
fs.BoolVar(&cpArgs.verbose, "verbose", false, "verbose output")
fs.BoolVar(&cpArgs.targets, "targets", false, "list possible file cp targets")
return fs
})(),
}
var cpArgs struct {
name string
verbose bool
targets bool
}
func runCp(ctx context.Context, args []string) error {
if cpArgs.targets {
return runCpTargets(ctx, args)
}
if len(args) < 2 {
return errors.New("usage: tailscale file cp <files...> <target>:")
}
files, target := args[:len(args)-1], args[len(args)-1]
if !strings.HasSuffix(target, ":") {
return fmt.Errorf("final argument to 'tailscale file cp' must end in colon")
}
target = strings.TrimSuffix(target, ":")
hadBrackets := false
if strings.HasPrefix(target, "[") && strings.HasSuffix(target, "]") {
hadBrackets = true
target = strings.TrimSuffix(strings.TrimPrefix(target, "["), "]")
}
if ip, err := netaddr.ParseIP(target); err == nil && ip.Is6() && !hadBrackets {
return fmt.Errorf("an IPv6 literal must be written as [%s]", ip)
} else if hadBrackets && (err != nil || !ip.Is6()) {
return errors.New("unexpected brackets around target")
}
ip, _, err := tailscaleIPFromArg(ctx, target)
if err != nil {
return err
}
stableID, isOffline, err := getTargetStableID(ctx, ip)
if err != nil {
return fmt.Errorf("can't send to %s: %v", target, err)
}
if isOffline {
fmt.Fprintf(Stderr, "# warning: %s is offline\n", target)
}
if len(files) > 1 {
if cpArgs.name != "" {
return errors.New("can't use --name= with multiple files")
}
for _, fileArg := range files {
if fileArg == "-" {
return errors.New("can't use '-' as STDIN file when providing filename arguments")
}
}
}
for _, fileArg := range files {
var fileContents io.Reader
var name = cpArgs.name
var contentLength int64 = -1
if fileArg == "-" {
fileContents = os.Stdin
if name == "" {
name, fileContents, err = pickStdinFilename()
if err != nil {
return err
}
}
} else {
f, err := os.Open(fileArg)
if err != nil {
if version.IsSandboxedMacOS() {
return errors.New("the GUI version of Tailscale on macOS runs in a macOS sandbox that can't read files")
}
return err
}
defer f.Close()
fi, err := f.Stat()
if err != nil {
return err
}
if fi.IsDir() {
return errors.New("directories not supported")
}
contentLength = fi.Size()
fileContents = io.LimitReader(f, contentLength)
if name == "" {
name = filepath.Base(fileArg)
}
if envknob.Bool("TS_DEBUG_SLOW_PUSH") {
fileContents = &slowReader{r: fileContents}
}
}
if cpArgs.verbose {
log.Printf("sending %q to %v/%v/%v ...", name, target, ip, stableID)
}
err := tailscale.PushFile(ctx, stableID, contentLength, name, fileContents)
if err != nil {
return err
}
if cpArgs.verbose {
log.Printf("sent %q", name)
}
}
return nil
}
func getTargetStableID(ctx context.Context, ipStr string) (id tailcfg.StableNodeID, isOffline bool, err error) {
ip, err := netaddr.ParseIP(ipStr)
if err != nil {
return "", false, err
}
fts, err := tailscale.FileTargets(ctx)
if err != nil {
return "", false, err
}
for _, ft := range fts {
n := ft.Node
for _, a := range n.Addresses {
if a.IP() != ip {
continue
}
isOffline = n.Online != nil && !*n.Online
return n.StableID, isOffline, nil
}
}
return "", false, fileTargetErrorDetail(ctx, ip)
}
// fileTargetErrorDetail returns a non-nil error saying why ip is an
// invalid file sharing target.
func fileTargetErrorDetail(ctx context.Context, ip netaddr.IP) error {
found := false
if st, err := tailscale.Status(ctx); err == nil && st.Self != nil {
for _, peer := range st.Peer {
for _, pip := range peer.TailscaleIPs {
if pip == ip {
found = true
if peer.UserID != st.Self.UserID {
return errors.New("owned by different user; can only send files to your own devices")
}
}
}
}
}
if found {
return errors.New("target seems to be running an old Tailscale version")
}
if !tsaddr.IsTailscaleIP(ip) {
return fmt.Errorf("unknown target; %v is not a Tailscale IP address", ip)
}
return errors.New("unknown target; not in your Tailnet")
}
const maxSniff = 4 << 20
func ext(b []byte) string {
if len(b) < maxSniff && utf8.Valid(b) {
return ".txt"
}
if exts, _ := mime.ExtensionsByType(http.DetectContentType(b)); len(exts) > 0 {
return exts[0]
}
return ""
}
// pickStdinFilename reads a bit of stdin to return a good filename
// for its contents. The returned Reader is the concatenation of the
// read and unread bits.
func pickStdinFilename() (name string, r io.Reader, err error) {
sniff, err := io.ReadAll(io.LimitReader(os.Stdin, maxSniff))
if err != nil {
return "", nil, err
}
return "stdin" + ext(sniff), io.MultiReader(bytes.NewReader(sniff), os.Stdin), nil
}
type slowReader struct {
r io.Reader
rl *rate.Limiter
}
func (r *slowReader) Read(p []byte) (n int, err error) {
const burst = 4 << 10
plen := len(p)
if plen > burst {
plen = burst
}
if r.rl == nil {
r.rl = rate.NewLimiter(rate.Limit(1<<10), burst)
}
n, err = r.r.Read(p[:plen])
r.rl.WaitN(context.Background(), n)
return
}
func runCpTargets(ctx context.Context, args []string) error {
if len(args) > 0 {
return errors.New("invalid arguments with --targets")
}
fts, err := tailscale.FileTargets(ctx)
if err != nil {
return err
}
for _, ft := range fts {
n := ft.Node
var detail string
if n.Online != nil {
if !*n.Online {
detail = "offline"
}
} else {
detail = "unknown-status"
}
if detail != "" && n.LastSeen != nil {
d := time.Since(*n.LastSeen)
detail += fmt.Sprintf("; last seen %v ago", d.Round(time.Minute))
}
if detail != "" {
detail = "\t" + detail
}
printf("%s\t%s%s\n", n.Addresses[0].IP(), n.ComputedName, detail)
}
return nil
}
var fileGetCmd = &ffcli.Command{
Name: "get",
ShortUsage: "file get [--wait] [--verbose] <target-directory>",
ShortHelp: "Move files out of the Tailscale file inbox",
Exec: runFileGet,
FlagSet: (func() *flag.FlagSet {
fs := newFlagSet("get")
fs.BoolVar(&getArgs.wait, "wait", false, "wait for a file to arrive if inbox is empty")
fs.BoolVar(&getArgs.verbose, "verbose", false, "verbose output")
return fs
})(),
}
var getArgs struct {
wait bool
verbose bool
}
func runFileGet(ctx context.Context, args []string) error {
if len(args) != 1 {
return errors.New("usage: file get <target-directory>")
}
log.SetFlags(0)
dir := args[0]
if dir == "/dev/null" {
return wipeInbox(ctx)
}
if fi, err := os.Stat(dir); err != nil || !fi.IsDir() {
return fmt.Errorf("%q is not a directory", dir)
}
var wfs []apitype.WaitingFile
var err error
for {
wfs, err = tailscale.WaitingFiles(ctx)
if err != nil {
return fmt.Errorf("getting WaitingFiles: %w", err)
}
if len(wfs) != 0 || !getArgs.wait {
break
}
if getArgs.verbose {
log.Printf("waiting for file...")
}
if err := waitForFile(ctx); err != nil {
return err
}
}
deleted := 0
for _, wf := range wfs {
rc, size, err := tailscale.GetWaitingFile(ctx, wf.Name)
if err != nil {
return fmt.Errorf("opening inbox file %q: %v", wf.Name, err)
}
targetFile := filepath.Join(dir, wf.Name)
of, err := os.OpenFile(targetFile, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0644)
if err != nil {
if _, err := os.Stat(targetFile); err == nil {
return fmt.Errorf("refusing to overwrite %v", targetFile)
}
return err
}
_, err = io.Copy(of, rc)
rc.Close()
if err != nil {
return fmt.Errorf("failed to write %v: %v", targetFile, err)
}
if err := of.Close(); err != nil {
return err
}
if getArgs.verbose {
log.Printf("wrote %v (%d bytes)", wf.Name, size)
}
if err := tailscale.DeleteWaitingFile(ctx, wf.Name); err != nil {
return fmt.Errorf("deleting %q from inbox: %v", wf.Name, err)
}
deleted++
}
if getArgs.verbose {
log.Printf("moved %d files", deleted)
}
return nil
}
func wipeInbox(ctx context.Context) error {
if getArgs.wait {
return errors.New("can't use --wait with /dev/null target")
}
wfs, err := tailscale.WaitingFiles(ctx)
if err != nil {
return fmt.Errorf("getting WaitingFiles: %w", err)
}
deleted := 0
for _, wf := range wfs {
if getArgs.verbose {
log.Printf("deleting %v ...", wf.Name)
}
if err := tailscale.DeleteWaitingFile(ctx, wf.Name); err != nil {
return fmt.Errorf("deleting %q: %v", wf.Name, err)
}
deleted++
}
if getArgs.verbose {
log.Printf("deleted %d files", deleted)
}
return nil
}
func waitForFile(ctx context.Context) error {
c, bc, pumpCtx, cancel := connect(ctx)
defer cancel()
fileWaiting := make(chan bool, 1)
bc.SetNotifyCallback(func(n ipn.Notify) {
if n.ErrMessage != nil {
fatalf("Notify.ErrMessage: %v\n", *n.ErrMessage)
}
if n.FilesWaiting != nil {
select {
case fileWaiting <- true:
default:
}
}
})
go pump(pumpCtx, bc, c)
select {
case <-fileWaiting:
return nil
case <-pumpCtx.Done():
return pumpCtx.Err()
case <-ctx.Done():
return ctx.Err()
}
}