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-rw-r--r--app/tools/libwg-go/api-android.go176
1 files changed, 176 insertions, 0 deletions
diff --git a/app/tools/libwg-go/api-android.go b/app/tools/libwg-go/api-android.go
new file mode 100644
index 0000000..7e951b9
--- /dev/null
+++ b/app/tools/libwg-go/api-android.go
@@ -0,0 +1,176 @@
+/* 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() {}