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tailscale/cmd/tailscaled/taildrop.go

107 lines
3.1 KiB
Go

// Copyright (c) 2022 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.
//go:build go1.19
package main
import (
"fmt"
"os"
"path/filepath"
"tailscale.com/ipn/ipnlocal"
"tailscale.com/types/logger"
"tailscale.com/version/distro"
)
func configureTaildrop(logf logger.Logf, lb *ipnlocal.LocalBackend) {
dg := distro.Get()
switch dg {
case distro.Synology, distro.TrueNAS, distro.QNAP:
// See if they have a "Taildrop" share.
// See https://github.com/tailscale/tailscale/issues/2179#issuecomment-982821319
path, err := findTaildropDir(dg)
if err != nil {
logf("%s Taildrop support: %v", dg, err)
} else {
logf("%s Taildrop: using %v", dg, path)
lb.SetDirectFileRoot(path)
lb.SetDirectFileDoFinalRename(true)
}
}
}
func findTaildropDir(dg distro.Distro) (string, error) {
const name = "Taildrop"
switch dg {
case distro.Synology:
return findSynologyTaildropDir(name)
case distro.TrueNAS:
return findTrueNASTaildropDir(name)
case distro.QNAP:
return findQnapTaildropDir(name)
}
return "", fmt.Errorf("%s is an unsupported distro for Taildrop dir", dg)
}
// findSynologyTaildropDir looks for the first volume containing a
// "Taildrop" directory. We'd run "synoshare --get Taildrop" command
// but on DSM7 at least, we lack permissions to run that.
func findSynologyTaildropDir(name string) (dir string, err error) {
for i := 1; i <= 16; i++ {
dir = fmt.Sprintf("/volume%v/%s", i, name)
if fi, err := os.Stat(dir); err == nil && fi.IsDir() {
return dir, nil
}
}
return "", fmt.Errorf("shared folder %q not found", name)
}
// findTrueNASTaildropDir returns the first matching directory of
// /mnt/{name} or /mnt/*/{name}
func findTrueNASTaildropDir(name string) (dir string, err error) {
// If we're running in a jail, a mount point could just be added at /mnt/Taildrop
dir = fmt.Sprintf("/mnt/%s", name)
if fi, err := os.Stat(dir); err == nil && fi.IsDir() {
return dir, nil
}
// but if running on the host, it may be something like /mnt/Primary/Taildrop
fis, err := os.ReadDir("/mnt")
if err != nil {
return "", fmt.Errorf("error reading /mnt: %w", err)
}
for _, fi := range fis {
dir = fmt.Sprintf("/mnt/%s/%s", fi.Name(), name)
if fi, err := os.Stat(dir); err == nil && fi.IsDir() {
return dir, nil
}
}
return "", fmt.Errorf("shared folder %q not found", name)
}
// findQnapTaildropDir checks if a Shared Folder named "Taildrop" exists.
func findQnapTaildropDir(name string) (string, error) {
dir := fmt.Sprintf("/share/%s", name)
fi, err := os.Stat(dir)
if err != nil {
return "", fmt.Errorf("shared folder %q not found", name)
}
if fi.IsDir() {
return dir, nil
}
// share/Taildrop is usually a symlink to CACHEDEV1_DATA/Taildrop/ or some such.
fullpath, err := filepath.EvalSymlinks(dir)
if err != nil {
return "", fmt.Errorf("symlink to shared folder %q not found", name)
}
if fi, err = os.Stat(fullpath); err == nil && fi.IsDir() {
return dir, nil // return the symlink, how QNAP set it up
}
return "", fmt.Errorf("shared folder %q not found", name)
}