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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
//go:build go1.19
package main
import (
"errors"
"fmt"
"io"
"io/fs"
"os"
"os/exec"
"path/filepath"
)
func init() {
installSystemDaemon = installSystemDaemonDarwin
uninstallSystemDaemon = uninstallSystemDaemonDarwin
}
// darwinLaunchdPlist is the launchd.plist that's written to
// /Library/LaunchDaemons/com.tailscale.tailscaled.plist or (in the
// future) a user-specific location.
//
// See man launchd.plist.
const darwinLaunchdPlist = `
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Label</key>
<string>com.tailscale.tailscaled</string>
<key>ProgramArguments</key>
<array>
<string>/usr/local/bin/tailscaled</string>
</array>
<key>RunAtLoad</key>
<true/>
</dict>
</plist>
`
const sysPlist = "/Library/LaunchDaemons/com.tailscale.tailscaled.plist"
const targetBin = "/usr/local/bin/tailscaled"
const service = "com.tailscale.tailscaled"
func uninstallSystemDaemonDarwin(args []string) (ret error) {
if len(args) > 0 {
return errors.New("uninstall subcommand takes no arguments")
}
plist, err := exec.Command("launchctl", "list", "com.tailscale.tailscaled").Output()
_ = plist // parse it? https://github.com/DHowett/go-plist if we need something.
running := err == nil
if running {
out, err := exec.Command("launchctl", "stop", "com.tailscale.tailscaled").CombinedOutput()
if err != nil {
fmt.Printf("launchctl stop com.tailscale.tailscaled: %v, %s\n", err, out)
ret = err
}
out, err = exec.Command("launchctl", "unload", sysPlist).CombinedOutput()
if err != nil {
fmt.Printf("launchctl unload %s: %v, %s\n", sysPlist, err, out)
if ret == nil {
ret = err
}
}
}
if err := os.Remove(sysPlist); err != nil {
if os.IsNotExist(err) {
err = nil
}
if ret == nil {
ret = err
}
}
// Do not delete targetBin if it's a symlink, which happens if it was installed via
// Homebrew.
if isSymlink(targetBin) {
return ret
}
if err := os.Remove(targetBin); err != nil {
if os.IsNotExist(err) {
err = nil
}
if ret == nil {
ret = err
}
}
return ret
}
func installSystemDaemonDarwin(args []string) (err error) {
if len(args) > 0 {
return errors.New("install subcommand takes no arguments")
}
defer func() {
if err != nil && os.Getuid() != 0 {
err = fmt.Errorf("%w; try running tailscaled with sudo", err)
}
}()
// Best effort:
uninstallSystemDaemonDarwin(nil)
exe, err := os.Executable()
if err != nil {
return fmt.Errorf("failed to find our own executable path: %w", err)
}
same, err := sameFile(exe, targetBin)
if err != nil {
return err
}
// Do not overwrite targetBin with the binary file if it it's already
// pointing to it. This is primarily to handle Homebrew that writes
// /usr/local/bin/tailscaled is a symlink to the actual binary.
if !same {
if err := copyBinary(exe, targetBin); err != nil {
return err
}
}
if err := os.WriteFile(sysPlist, []byte(darwinLaunchdPlist), 0700); err != nil {
return err
}
if out, err := exec.Command("launchctl", "load", sysPlist).CombinedOutput(); err != nil {
return fmt.Errorf("error running launchctl load %s: %v, %s", sysPlist, err, out)
}
if out, err := exec.Command("launchctl", "start", service).CombinedOutput(); err != nil {
return fmt.Errorf("error running launchctl start %s: %v, %s", service, err, out)
}
return nil
}
// copyBinary copies binary file `src` into `dst`.
func copyBinary(src, dst string) error {
if err := os.MkdirAll(filepath.Dir(dst), 0755); err != nil {
return err
}
tmpBin := dst + ".tmp"
f, err := os.Create(tmpBin)
if err != nil {
return err
}
srcf, err := os.Open(src)
if err != nil {
f.Close()
return err
}
_, err = io.Copy(f, srcf)
srcf.Close()
if err != nil {
f.Close()
return err
}
if err := f.Close(); err != nil {
return err
}
if err := os.Chmod(tmpBin, 0755); err != nil {
return err
}
if err := os.Rename(tmpBin, dst); err != nil {
return err
}
return nil
}
func isSymlink(path string) bool {
fi, err := os.Lstat(path)
return err == nil && (fi.Mode()&os.ModeSymlink == os.ModeSymlink)
}
// sameFile returns true if both file paths exist and resolve to the same file.
func sameFile(path1, path2 string) (bool, error) {
dst1, err := filepath.EvalSymlinks(path1)
if err != nil && !errors.Is(err, fs.ErrNotExist) {
return false, fmt.Errorf("EvalSymlinks(%s): %w", path1, err)
}
dst2, err := filepath.EvalSymlinks(path2)
if err != nil && !errors.Is(err, fs.ErrNotExist) {
return false, fmt.Errorf("EvalSymlinks(%s): %w", path2, err)
}
return dst1 == dst2, nil
}
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