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/* SPDX-License-Identifier: Apache-2.0
*
* Copyright © 2017-2022 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
package main
// #cgo LDFLAGS: -llog
// #include <android/log.h>
import "C"
import (
"fmt"
"math"
"net"
"os"
"os/signal"
"runtime"
"runtime/debug"
"strings"
"unsafe"
"golang.org/x/sys/unix"
"golang.zx2c4.com/wireguard/conn"
"golang.zx2c4.com/wireguard/device"
"golang.zx2c4.com/wireguard/ipc"
"golang.zx2c4.com/wireguard/tun"
)
type AndroidLogger struct {
level C.int
tag *C.char
}
func cstring(s string) *C.char {
b, err := unix.BytePtrFromString(s)
if err != nil {
b := [1]C.char{}
return &b[0]
}
return (*C.char)(unsafe.Pointer(b))
}
func (l AndroidLogger) Printf(format string, args ...interface{}) {
C.__android_log_write(l.level, l.tag, cstring(fmt.Sprintf(format, args...)))
}
type TunnelHandle struct {
device *device.Device
uapi net.Listener
}
var tunnelHandles map[int32]TunnelHandle
func init() {
tunnelHandles = make(map[int32]TunnelHandle)
signals := make(chan os.Signal)
signal.Notify(signals, unix.SIGUSR2)
go func() {
buf := make([]byte, os.Getpagesize())
for {
select {
case <-signals:
n := runtime.Stack(buf, true)
if n == len(buf) {
n--
}
buf[n] = 0
C.__android_log_write(C.ANDROID_LOG_ERROR, cstring("WireGuard/GoBackend/Stacktrace"), (*C.char)(unsafe.Pointer(&buf[0])))
}
}
}()
}
//export wgTurnOn
func wgTurnOn(interfaceName string, tunFd int32, settings string) int32 {
tag := cstring("WireGuard/GoBackend/" + interfaceName)
logger := &device.Logger{
Verbosef: AndroidLogger{level: C.ANDROID_LOG_DEBUG, tag: tag}.Printf,
Errorf: AndroidLogger{level: C.ANDROID_LOG_ERROR, tag: tag}.Printf,
}
tun, name, err := tun.CreateUnmonitoredTUNFromFD(int(tunFd))
if err != nil {
unix.Close(int(tunFd))
logger.Errorf("CreateUnmonitoredTUNFromFD: %v", err)
return -1
}
logger.Verbosef("Attaching to interface %v", name)
device := device.NewDevice(tun, conn.NewStdNetBind(), logger)
err = device.IpcSet(settings)
if err != nil {
unix.Close(int(tunFd))
logger.Errorf("IpcSet: %v", err)
return -1
}
device.DisableSomeRoamingForBrokenMobileSemantics()
var uapi net.Listener
uapiFile, err := ipc.UAPIOpen(name)
if err != nil {
logger.Errorf("UAPIOpen: %v", err)
} else {
uapi, err = ipc.UAPIListen(name, uapiFile)
if err != nil {
uapiFile.Close()
logger.Errorf("UAPIListen: %v", err)
} else {
go func() {
for {
conn, err := uapi.Accept()
if err != nil {
return
}
go device.IpcHandle(conn)
}
}()
}
}
err = device.Up()
if err != nil {
logger.Errorf("Unable to bring up device: %v", err)
uapiFile.Close()
device.Close()
return -1
}
logger.Verbosef("Device started")
var i int32
for i = 0; i < math.MaxInt32; i++ {
if _, exists := tunnelHandles[i]; !exists {
break
}
}
if i == math.MaxInt32 {
logger.Errorf("Unable to find empty handle")
uapiFile.Close()
device.Close()
return -1
}
tunnelHandles[i] = TunnelHandle{device: device, uapi: uapi}
return i
}
//export wgTurnOff
func wgTurnOff(tunnelHandle int32) {
handle, ok := tunnelHandles[tunnelHandle]
if !ok {
return
}
delete(tunnelHandles, tunnelHandle)
if handle.uapi != nil {
handle.uapi.Close()
}
handle.device.Close()
}
//export wgGetSocketV4
func wgGetSocketV4(tunnelHandle int32) int32 {
handle, ok := tunnelHandles[tunnelHandle]
if !ok {
return -1
}
bind, _ := handle.device.Bind().(conn.PeekLookAtSocketFd)
if bind == nil {
return -1
}
fd, err := bind.PeekLookAtSocketFd4()
if err != nil {
return -1
}
return int32(fd)
}
//export wgGetSocketV6
func wgGetSocketV6(tunnelHandle int32) int32 {
handle, ok := tunnelHandles[tunnelHandle]
if !ok {
return -1
}
bind, _ := handle.device.Bind().(conn.PeekLookAtSocketFd)
if bind == nil {
return -1
}
fd, err := bind.PeekLookAtSocketFd6()
if err != nil {
return -1
}
return int32(fd)
}
//export wgGetConfig
func wgGetConfig(tunnelHandle int32) *C.char {
handle, ok := tunnelHandles[tunnelHandle]
if !ok {
return nil
}
settings, err := handle.device.IpcGet()
if err != nil {
return nil
}
return C.CString(settings)
}
//export wgVersion
func wgVersion() *C.char {
return C.CString(Version())
}
//export wgSetConfig
func wgSetConfig(tunnelHandle int32, settings string) int32 {
handle, ok := tunnelHandles[tunnelHandle]
if !ok {
return -1
}
err := handle.device.IpcSet(settings)
if err != nil {
return -1
}
return 0
}
func Version() string {
info, ok := debug.ReadBuildInfo()
if !ok {
return C.CString("unknown")
}
for _, dep := range info.Deps {
if dep.Path == "golang.zx2c4.com/wireguard" {
parts := strings.Split(dep.Version, "-")
if len(parts) == 3 && len(parts[2]) == 12 {
return C.CString(parts[2][:7])
}
return C.CString(dep.Version)
}
}
return C.CString("unknown")
}
func main() {}
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