wireguard-go/main.go

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//go:build !windows
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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
*/
package main
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import (
"fmt"
"os"
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"os/signal"
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"runtime"
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"strconv"
"syscall"
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"golang.zx2c4.com/wireguard/conn"
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"golang.zx2c4.com/wireguard/device"
"golang.zx2c4.com/wireguard/ipc"
"golang.zx2c4.com/wireguard/tun"
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)
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const (
ExitSetupSuccess = 0
ExitSetupFailed = 1
)
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const (
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ENV_WG_TUN_FD = "WG_TUN_FD"
ENV_WG_UAPI_FD = "WG_UAPI_FD"
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ENV_WG_PROCESS_FOREGROUND = "WG_PROCESS_FOREGROUND"
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)
func printUsage() {
fmt.Printf("Usage: %s [-f/--foreground] INTERFACE-NAME\n", os.Args[0])
}
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func warning() {
switch runtime.GOOS {
case "linux", "freebsd", "openbsd":
if os.Getenv(ENV_WG_PROCESS_FOREGROUND) == "1" {
return
}
default:
return
}
fmt.Fprintln(os.Stderr, "┌──────────────────────────────────────────────────────┐")
fmt.Fprintln(os.Stderr, "│ │")
fmt.Fprintln(os.Stderr, "│ Running wireguard-go is not required because this │")
fmt.Fprintln(os.Stderr, "│ kernel has first class support for WireGuard. For │")
fmt.Fprintln(os.Stderr, "│ information on installing the kernel module, │")
fmt.Fprintln(os.Stderr, "│ please visit: │")
fmt.Fprintln(os.Stderr, "│ https://www.wireguard.com/install/ │")
fmt.Fprintln(os.Stderr, "│ │")
fmt.Fprintln(os.Stderr, "└──────────────────────────────────────────────────────┘")
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}
func main() {
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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", Version, runtime.GOOS, runtime.GOARCH)
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return
}
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warning()
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var foreground bool
var interfaceName string
if len(os.Args) < 2 || len(os.Args) > 3 {
printUsage()
return
}
switch os.Args[1] {
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case "-f", "--foreground":
foreground = true
if len(os.Args) != 3 {
printUsage()
return
}
interfaceName = os.Args[2]
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default:
foreground = false
if len(os.Args) != 2 {
printUsage()
return
}
interfaceName = os.Args[1]
}
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if !foreground {
foreground = os.Getenv(ENV_WG_PROCESS_FOREGROUND) == "1"
}
// get log level (default: info)
logLevel := func() int {
switch os.Getenv("LOG_LEVEL") {
case "verbose", "debug":
return device.LogLevelVerbose
case "error":
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return device.LogLevelError
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case "silent":
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return device.LogLevelSilent
}
return device.LogLevelError
}()
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// open TUN device (or use supplied fd)
tun, err := func() (tun.Device, error) {
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tunFdStr := os.Getenv(ENV_WG_TUN_FD)
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if tunFdStr == "" {
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return tun.CreateTUN(interfaceName, device.DefaultMTU)
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}
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// construct tun device from supplied fd
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fd, err := strconv.ParseUint(tunFdStr, 10, 32)
if err != nil {
return nil, err
}
err = syscall.SetNonblock(int(fd), true)
if err != nil {
return nil, err
}
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file := os.NewFile(uintptr(fd), "")
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return tun.CreateTUNFromFile(file, device.DefaultMTU)
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}()
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if err == nil {
realInterfaceName, err2 := tun.Name()
if err2 == nil {
interfaceName = realInterfaceName
}
}
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logger := device.NewLogger(
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logLevel,
fmt.Sprintf("(%s) ", interfaceName),
)
logger.Verbosef("Starting wireguard-go version %s", Version)
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if err != nil {
logger.Errorf("Failed to create TUN device: %v", err)
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os.Exit(ExitSetupFailed)
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}
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// open UAPI file (or use supplied fd)
fileUAPI, err := func() (*os.File, error) {
uapiFdStr := os.Getenv(ENV_WG_UAPI_FD)
if uapiFdStr == "" {
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return ipc.UAPIOpen(interfaceName)
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}
// 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.Errorf("UAPI listen error: %v", err)
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os.Exit(ExitSetupFailed)
return
}
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// daemonize the process
if !foreground {
env := os.Environ()
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env = append(env, fmt.Sprintf("%s=3", ENV_WG_TUN_FD))
env = append(env, fmt.Sprintf("%s=4", ENV_WG_UAPI_FD))
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env = append(env, fmt.Sprintf("%s=1", ENV_WG_PROCESS_FOREGROUND))
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files := [3]*os.File{}
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if os.Getenv("LOG_LEVEL") != "" && logLevel != device.LogLevelSilent {
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files[0], _ = os.Open(os.DevNull)
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files[1] = os.Stdout
files[2] = os.Stderr
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} else {
files[0], _ = os.Open(os.DevNull)
files[1], _ = os.Open(os.DevNull)
files[2], _ = os.Open(os.DevNull)
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}
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attr := &os.ProcAttr{
Files: []*os.File{
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files[0], // stdin
files[1], // stdout
files[2], // stderr
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tun.File(),
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fileUAPI,
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},
Dir: ".",
Env: env,
}
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path, err := os.Executable()
if err != nil {
logger.Errorf("Failed to determine executable: %v", err)
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os.Exit(ExitSetupFailed)
}
process, err := os.StartProcess(
path,
os.Args,
attr,
)
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if err != nil {
logger.Errorf("Failed to daemonize: %v", err)
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os.Exit(ExitSetupFailed)
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}
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process.Release()
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return
}
device := device.NewDevice(tun, conn.NewDefaultBind(), logger)
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logger.Verbosef("Device started")
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errs := make(chan error)
term := make(chan os.Signal, 1)
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uapi, err := ipc.UAPIListen(interfaceName, fileUAPI)
if err != nil {
logger.Errorf("Failed to listen on uapi socket: %v", err)
os.Exit(ExitSetupFailed)
}
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go func() {
for {
conn, err := uapi.Accept()
if err != nil {
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errs <- err
return
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}
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go device.IpcHandle(conn)
}
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}()
logger.Verbosef("UAPI listener started")
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// wait for program to terminate
signal.Notify(term, syscall.SIGTERM)
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signal.Notify(term, os.Interrupt)
select {
case <-term:
case <-errs:
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case <-device.Wait():
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}
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// clean up
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uapi.Close()
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device.Close()
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logger.Verbosef("Shutting down")
}