android fix - libwg-go added

client/android/wireguard/libwg-go/api-android.go

@@ -0,0 +1,227 @@
+/* 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 (
+	"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 {
+	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() {}