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- package main
-
- // #cgo LDFLAGS: -llog
- // #include <android/log.h>
- import "C"
-
- import (
- "bufio"
- "io/ioutil"
- "log"
- "math"
- "os"
- "strings"
- "syscall"
- )
-
- 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
- }
-
- var tunnelHandles map[int32]*Device
-
- func init() {
- tunnelHandles = make(map[int32]*Device)
- }
-
- //export wgTurnOn
- func wgTurnOn(ifnameRef string, tun_fd int32, settings string) int32 {
- interfaceName := string([]byte(ifnameRef))
-
- logger := &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 := &NativeTun{
- fd: os.NewFile(uintptr(tun_fd), "/dev/tun"),
- events: make(chan TUNEvent, 5),
- errors: make(chan error, 5),
- nopi: true,
- }
- var err error
-
- err = syscall.SetNonblock(int(tun_fd), true)
- if err != nil {
- logger.Error.Println(err)
- return -1
- }
- tun.closingReader, tun.closingWriter, err = os.Pipe()
- if err != nil {
- logger.Error.Println(err)
- return -1
- }
- name, err := tun.Name()
- if err != nil {
- logger.Error.Println(err)
- return -1
- }
- logger.Info.Println("Attaching to interface", name)
- device := NewDevice(tun, logger)
- logger.Debug.Println("Interface has MTU", device.tun.mtu)
-
- bufferedSettings := bufio.NewReadWriter(bufio.NewReader(strings.NewReader(settings)), bufio.NewWriter(ioutil.Discard))
- setError := ipcSetOperation(device, bufferedSettings)
- if setError != nil {
- logger.Error.Println(setError)
- return -1
- }
-
- 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 {
- return -1
- }
- tunnelHandles[i] = device
- return i
- }
-
- //export wgTurnOff
- func wgTurnOff(tunnelHandle int32) {
- device, ok := tunnelHandles[tunnelHandle]
- if !ok {
- return
- }
- delete(tunnelHandles, tunnelHandle)
- device.Close()
- }
-
- //export wgGetSocketV4
- func wgGetSocketV4(tunnelHandle int32) int32 {
- device, ok := tunnelHandles[tunnelHandle]
- if !ok {
- return -1
- }
- native, ok := device.net.bind.(*NativeBind)
- if !ok {
- return -1
- }
- return int32(native.sock4)
- }
-
- //export wgGetSocketV6
- func wgGetSocketV6(tunnelHandle int32) int32 {
- device, ok := tunnelHandles[tunnelHandle]
- if !ok {
- return -1
- }
- native, ok := device.net.bind.(*NativeBind)
- if !ok {
- return -1
- }
- return int32(native.sock6)
- }
-
- func main() {}
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