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tailscale/safesocket/safesocket.go

71 lines
2.1 KiB
Go

// Copyright (c) 2020 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 safesocket creates either a Unix socket, if possible, or
// otherwise a localhost TCP connection.
package safesocket
import (
"errors"
"net"
"runtime"
)
type closeable interface {
CloseRead() error
CloseWrite() error
}
// ConnCloseRead calls c's CloseRead method. c is expected to be
// either a UnixConn or TCPConn as returned from this package.
func ConnCloseRead(c net.Conn) error {
return c.(closeable).CloseRead()
}
// ConnCloseWrite calls c's CloseWrite method. c is expected to be
// either a UnixConn or TCPConn as returned from this package.
func ConnCloseWrite(c net.Conn) error {
return c.(closeable).CloseWrite()
}
// Connect connects to either path (on Unix) or the provided localhost port (on Windows).
func Connect(path string, port uint16) (net.Conn, error) {
return connect(path, port)
}
// Listen returns a listener either on Unix socket path (on Unix), or
// the localhost port (on Windows).
// If port is 0, the returned gotPort says which port was selected on Windows.
func Listen(path string, port uint16) (_ net.Listener, gotPort uint16, _ error) {
return listen(path, port)
}
var (
ErrTokenNotFound = errors.New("no token found")
ErrNoTokenOnOS = errors.New("no token on " + runtime.GOOS)
)
var localTCPPortAndToken func() (port int, token string, err error)
// LocalTCPPortAndToken returns the port number and auth token to connect to
// the local Tailscale daemon. It's currently only applicable on macOS
// when tailscaled is being run in the Mac Sandbox from the App Store version
// of Tailscale.
func LocalTCPPortAndToken() (port int, token string, err error) {
if localTCPPortAndToken == nil {
return 0, "", ErrNoTokenOnOS
}
return localTCPPortAndToken()
}
// PlatformUsesPeerCreds reports whether the current platform uses peer credentials
// to authenticate connections.
func PlatformUsesPeerCreds() bool {
switch runtime.GOOS {
case "linux", "darwin", "freebsd":
return true
}
return false
}