mirror of
https://github.com/KusakabeShi/EtherGuard-VPN.git
synced 2024-12-29 08:58:49 +01:00
288 lines
6.8 KiB
Go
288 lines
6.8 KiB
Go
// +build !windows
|
|
|
|
/* SPDX-License-Identifier: MIT
|
|
*
|
|
* Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
|
|
*/
|
|
|
|
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"git.zx2c4.com/wireguard-go/tun"
|
|
"os"
|
|
"os/signal"
|
|
"runtime"
|
|
"strconv"
|
|
"syscall"
|
|
)
|
|
|
|
const (
|
|
ExitSetupSuccess = 0
|
|
ExitSetupFailed = 1
|
|
)
|
|
|
|
const (
|
|
ENV_WG_TUN_FD = "WG_TUN_FD"
|
|
ENV_WG_UAPI_FD = "WG_UAPI_FD"
|
|
ENV_WG_PROCESS_FOREGROUND = "WG_PROCESS_FOREGROUND"
|
|
)
|
|
|
|
func printUsage() {
|
|
fmt.Printf("usage:\n")
|
|
fmt.Printf("%s [-f/--foreground] INTERFACE-NAME\n", os.Args[0])
|
|
}
|
|
|
|
func warning() {
|
|
if os.Getenv(ENV_WG_PROCESS_FOREGROUND) == "1" {
|
|
return
|
|
}
|
|
|
|
shouldQuit := false
|
|
|
|
fmt.Fprintln(os.Stderr, "WARNING WARNING WARNING WARNING WARNING WARNING WARNING")
|
|
fmt.Fprintln(os.Stderr, "W G")
|
|
fmt.Fprintln(os.Stderr, "W This is alpha software. It will very likely not G")
|
|
fmt.Fprintln(os.Stderr, "W do what it is supposed to do, and things may go G")
|
|
fmt.Fprintln(os.Stderr, "W horribly wrong. You have been warned. Proceed G")
|
|
fmt.Fprintln(os.Stderr, "W at your own risk. G")
|
|
if runtime.GOOS == "linux" {
|
|
shouldQuit = os.Getenv("WG_I_PREFER_BUGGY_USERSPACE_TO_POLISHED_KMOD") != "1"
|
|
|
|
fmt.Fprintln(os.Stderr, "W G")
|
|
fmt.Fprintln(os.Stderr, "W Furthermore, you are running this software on a G")
|
|
fmt.Fprintln(os.Stderr, "W Linux kernel, which is probably unnecessary and G")
|
|
fmt.Fprintln(os.Stderr, "W foolish. This is because the Linux kernel has G")
|
|
fmt.Fprintln(os.Stderr, "W built-in first class support for WireGuard, and G")
|
|
fmt.Fprintln(os.Stderr, "W this support is much more refined than this G")
|
|
fmt.Fprintln(os.Stderr, "W program. For more information on installing the G")
|
|
fmt.Fprintln(os.Stderr, "W kernel module, please visit: G")
|
|
fmt.Fprintln(os.Stderr, "W https://www.wireguard.com/install G")
|
|
if shouldQuit {
|
|
fmt.Fprintln(os.Stderr, "W G")
|
|
fmt.Fprintln(os.Stderr, "W If you still want to use this program, against G")
|
|
fmt.Fprintln(os.Stderr, "W the sage advice here, please first export this G")
|
|
fmt.Fprintln(os.Stderr, "W environment variable: G")
|
|
fmt.Fprintln(os.Stderr, "W WG_I_PREFER_BUGGY_USERSPACE_TO_POLISHED_KMOD=1 G")
|
|
}
|
|
}
|
|
fmt.Fprintln(os.Stderr, "W G")
|
|
fmt.Fprintln(os.Stderr, "WARNING WARNING WARNING WARNING WARNING WARNING WARNING")
|
|
|
|
if shouldQuit {
|
|
os.Exit(1)
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
if len(os.Args) == 2 && os.Args[1] == "--version" {
|
|
fmt.Printf("wireguard-go v%s\n\nUserspace WireGuard daemon for %s-%s.\nInformation available at https://www.wireguard.com.\nCopyright (C) Jason A. Donenfeld <Jason@zx2c4.com>.\n", WireGuardGoVersion, runtime.GOOS, runtime.GOARCH)
|
|
return
|
|
}
|
|
|
|
warning()
|
|
|
|
// parse arguments
|
|
|
|
var foreground bool
|
|
var interfaceName string
|
|
if len(os.Args) < 2 || len(os.Args) > 3 {
|
|
printUsage()
|
|
return
|
|
}
|
|
|
|
switch os.Args[1] {
|
|
|
|
case "-f", "--foreground":
|
|
foreground = true
|
|
if len(os.Args) != 3 {
|
|
printUsage()
|
|
return
|
|
}
|
|
interfaceName = os.Args[2]
|
|
|
|
default:
|
|
foreground = false
|
|
if len(os.Args) != 2 {
|
|
printUsage()
|
|
return
|
|
}
|
|
interfaceName = os.Args[1]
|
|
}
|
|
|
|
if !foreground {
|
|
foreground = os.Getenv(ENV_WG_PROCESS_FOREGROUND) == "1"
|
|
}
|
|
|
|
// get log level (default: info)
|
|
|
|
logLevel := func() int {
|
|
switch os.Getenv("LOG_LEVEL") {
|
|
case "debug":
|
|
return LogLevelDebug
|
|
case "info":
|
|
return LogLevelInfo
|
|
case "error":
|
|
return LogLevelError
|
|
case "silent":
|
|
return LogLevelSilent
|
|
}
|
|
return LogLevelInfo
|
|
}()
|
|
|
|
// open TUN device (or use supplied fd)
|
|
|
|
tun, err := func() (tun.TUNDevice, error) {
|
|
tunFdStr := os.Getenv(ENV_WG_TUN_FD)
|
|
if tunFdStr == "" {
|
|
return tun.CreateTUN(interfaceName, DefaultMTU)
|
|
}
|
|
|
|
// construct tun device from supplied fd
|
|
|
|
fd, err := strconv.ParseUint(tunFdStr, 10, 32)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
file := os.NewFile(uintptr(fd), "")
|
|
return tun.CreateTUNFromFile(file, DefaultMTU)
|
|
}()
|
|
|
|
if err == nil {
|
|
realInterfaceName, err2 := tun.Name()
|
|
if err2 == nil {
|
|
interfaceName = realInterfaceName
|
|
}
|
|
}
|
|
|
|
logger := NewLogger(
|
|
logLevel,
|
|
fmt.Sprintf("(%s) ", interfaceName),
|
|
)
|
|
|
|
logger.Info.Println("Starting wireguard-go version", WireGuardGoVersion)
|
|
|
|
logger.Debug.Println("Debug log enabled")
|
|
|
|
if err != nil {
|
|
logger.Error.Println("Failed to create TUN device:", err)
|
|
os.Exit(ExitSetupFailed)
|
|
}
|
|
|
|
// open UAPI file (or use supplied fd)
|
|
|
|
fileUAPI, err := func() (*os.File, error) {
|
|
uapiFdStr := os.Getenv(ENV_WG_UAPI_FD)
|
|
if uapiFdStr == "" {
|
|
return UAPIOpen(interfaceName)
|
|
}
|
|
|
|
// use supplied fd
|
|
|
|
fd, err := strconv.ParseUint(uapiFdStr, 10, 32)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return os.NewFile(uintptr(fd), ""), nil
|
|
}()
|
|
|
|
if err != nil {
|
|
logger.Error.Println("UAPI listen error:", err)
|
|
os.Exit(ExitSetupFailed)
|
|
return
|
|
}
|
|
// daemonize the process
|
|
|
|
if !foreground {
|
|
env := os.Environ()
|
|
env = append(env, fmt.Sprintf("%s=3", ENV_WG_TUN_FD))
|
|
env = append(env, fmt.Sprintf("%s=4", ENV_WG_UAPI_FD))
|
|
env = append(env, fmt.Sprintf("%s=1", ENV_WG_PROCESS_FOREGROUND))
|
|
files := [3]*os.File{}
|
|
if os.Getenv("LOG_LEVEL") != "" && logLevel != LogLevelSilent {
|
|
files[0], _ = os.Open(os.DevNull)
|
|
files[1] = os.Stdout
|
|
files[2] = os.Stderr
|
|
} else {
|
|
files[0], _ = os.Open(os.DevNull)
|
|
files[1], _ = os.Open(os.DevNull)
|
|
files[2], _ = os.Open(os.DevNull)
|
|
}
|
|
attr := &os.ProcAttr{
|
|
Files: []*os.File{
|
|
files[0], // stdin
|
|
files[1], // stdout
|
|
files[2], // stderr
|
|
tun.File(),
|
|
fileUAPI,
|
|
},
|
|
Dir: ".",
|
|
Env: env,
|
|
}
|
|
|
|
path, err := os.Executable()
|
|
if err != nil {
|
|
logger.Error.Println("Failed to determine executable:", err)
|
|
os.Exit(ExitSetupFailed)
|
|
}
|
|
|
|
process, err := os.StartProcess(
|
|
path,
|
|
os.Args,
|
|
attr,
|
|
)
|
|
if err != nil {
|
|
logger.Error.Println("Failed to daemonize:", err)
|
|
os.Exit(ExitSetupFailed)
|
|
}
|
|
process.Release()
|
|
return
|
|
}
|
|
|
|
device := NewDevice(tun, logger)
|
|
|
|
logger.Info.Println("Device started")
|
|
|
|
errs := make(chan error)
|
|
term := make(chan os.Signal, 1)
|
|
|
|
uapi, err := UAPIListen(interfaceName, fileUAPI)
|
|
if err != nil {
|
|
logger.Error.Println("Failed to listen on uapi socket:", err)
|
|
os.Exit(ExitSetupFailed)
|
|
}
|
|
|
|
go func() {
|
|
for {
|
|
conn, err := uapi.Accept()
|
|
if err != nil {
|
|
errs <- err
|
|
return
|
|
}
|
|
go ipcHandle(device, conn)
|
|
}
|
|
}()
|
|
|
|
logger.Info.Println("UAPI listener started")
|
|
|
|
// wait for program to terminate
|
|
|
|
signal.Notify(term, syscall.SIGTERM)
|
|
signal.Notify(term, os.Interrupt)
|
|
|
|
select {
|
|
case <-term:
|
|
case <-errs:
|
|
case <-device.Wait():
|
|
}
|
|
|
|
// clean up
|
|
|
|
uapi.Close()
|
|
device.Close()
|
|
|
|
logger.Info.Println("Shutting down")
|
|
}
|