From 0ea6f73332cf48374b8a98b16d68e25217ebf068 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Wed, 7 Feb 2018 19:19:20 +0100
Subject: GoBackend: integrate into app

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
 app/tools/libwg-go/api-android.go | 111 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 app/tools/libwg-go/api-android.go

(limited to 'app/tools/libwg-go/api-android.go')

diff --git a/app/tools/libwg-go/api-android.go b/app/tools/libwg-go/api-android.go
new file mode 100644
index 00000000..b2e3da17
--- /dev/null
+++ b/app/tools/libwg-go/api-android.go
@@ -0,0 +1,111 @@
+package main
+
+// #cgo LDFLAGS: -llog
+// #include <android/log.h>
+import "C"
+
+import (
+	"bufio"
+	"io/ioutil"
+	"log"
+	"math"
+	"os"
+	"strings"
+)
+
+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), ""),
+		events: make(chan TUNEvent, 5),
+		errors: make(chan error, 5),
+	}
+	device := NewDevice(tun, logger)
+	device.tun.mtu = DefaultMTU //TODO: make dynamic
+
+	bufferedSettings := bufio.NewReadWriter(bufio.NewReader(strings.NewReader(settings)), bufio.NewWriter(ioutil.Discard))
+	setError := ipcSetOperation(device, bufferedSettings)
+	if setError != nil {
+		logger.Debug.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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