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/* SPDX-License-Identifier: Apache-2.0
*
* Copyright (C) 2017-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
package main
// #cgo LDFLAGS: -llog
// #include <android/log.h>
import "C"
import (
"bufio"
"golang.org/x/sys/unix"
"golang.zx2c4.com/wireguard/device"
"golang.zx2c4.com/wireguard/ipc"
"golang.zx2c4.com/wireguard/tun"
"log"
"math"
"net"
"os"
"os/signal"
"runtime"
"strings"
"unsafe"
)
type AndroidLogger struct {
level C.int
interfaceName string
}
func (l AndroidLogger) Write(p []byte) (int, error) {
C.__android_log_write(l.level, C.CString("WireGuard/GoBackend/"+l.interfaceName), C.CString(string(p)))
return len(p), nil
}
type TunnelHandle struct {
device *device.Device
uapi net.Listener
}
var tunnelHandles map[int32]TunnelHandle
func init() {
device.RoamingDisabled = true
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)
buf[n] = 0
C.__android_log_write(C.ANDROID_LOG_ERROR, C.CString("WireGuard/GoBackend/Stacktrace"), (*C.char)(unsafe.Pointer(&buf[0])))
}
}
}()
}
//export wgTurnOn
func wgTurnOn(ifnameRef string, tunFd int32, settings string) int32 {
interfaceName := string([]byte(ifnameRef))
logger := &device.Logger{
Debug: log.New(&AndroidLogger{level: C.ANDROID_LOG_DEBUG, interfaceName: interfaceName}, "", 0),
Info: log.New(&AndroidLogger{level: C.ANDROID_LOG_INFO, interfaceName: interfaceName}, "", 0),
Error: log.New(&AndroidLogger{level: C.ANDROID_LOG_ERROR, interfaceName: interfaceName}, "", 0),
}
logger.Debug.Println("Debug log enabled")
tun, name, err := tun.CreateUnmonitoredTUNFromFD(int(tunFd))
if err != nil {
unix.Close(int(tunFd))
logger.Error.Println(err)
return -1
}
logger.Info.Println("Attaching to interface", name)
device := device.NewDevice(tun, logger)
setError := device.IpcSetOperation(bufio.NewReader(strings.NewReader(settings)))
if setError != nil {
unix.Close(int(tunFd))
logger.Error.Println(setError)
return -1
}
var uapi net.Listener
uapiFile, err := ipc.UAPIOpen(name)
if err != nil {
logger.Error.Println(err)
} else {
uapi, err = ipc.UAPIListen(name, uapiFile)
if err != nil {
uapiFile.Close()
logger.Error.Println(err)
} else {
go func() {
for {
conn, err := uapi.Accept()
if err != nil {
return
}
go device.IpcHandle(conn)
}
}()
}
}
device.Up()
logger.Info.Println("Device started")
var i int32
for i = 0; i < math.MaxInt32; i++ {
if _, exists := tunnelHandles[i]; !exists {
break
}
}
if i == math.MaxInt32 {
unix.Close(int(tunFd))
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
}
fd, err := handle.device.PeekLookAtSocketFd4()
if err != nil {
return -1
}
return int32(fd)
}
//export wgGetSocketV6
func wgGetSocketV6(tunnelHandle int32) int32 {
handle, ok := tunnelHandles[tunnelHandle]
if !ok {
return -1
}
fd, err := handle.device.PeekLookAtSocketFd6()
if err != nil {
return -1
}
return int32(fd)
}
//export wgVersion
func wgVersion() *C.char {
return C.CString(device.WireGuardGoVersion)
}
func main() {}
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