implement per-app VPN for Android 5.0

src/main/AndroidManifest.xml

@@ -1,7 +1,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.github.shadowsocks"
-    android:versionCode="75"
-    android:versionName="2.3.0">
+    android:versionCode="76"
+    android:versionName="2.3.1">
 
   <uses-permission android:name="android.permission.INTERNET"/>
   <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

src/main/scala/com/github/shadowsocks/AppManager.scala

@@ -89,8 +89,9 @@ object AppManager {
       case a => {
         val uid = a.uid
         val userName = uid.toString
+        val packageName = a.packageName
         val proxied = proxiedApps.binarySearch(userName) >= 0
-        new ProxiedApp(uid, userName, proxied)
+        new ProxiedApp(uid, packageName, proxied)
       }
     }.toArray
   }

src/main/scala/com/github/shadowsocks/Shadowsocks.scala

@@ -766,7 +766,7 @@ class Shadowsocks
       if (pref != null) {
         if (Seq(Key.isGlobalProxy, Key.isTrafficStat, Key.proxyedApps)
           .contains(name)) {
-          pref.setEnabled(enabled && !isVpnEnabled)
+          pref.setEnabled(enabled && (!isVpnEnabled || Build.VERSION.SDK_INT == Build.VERSION_CODES.LOLLIPOP))
         } else {
           pref.setEnabled(enabled)
         }

src/main/scala/com/github/shadowsocks/ShadowsocksVpnService.scala

@@ -55,6 +55,7 @@ import com.google.android.gms.analytics.HitBuilders
 import org.apache.commons.net.util.SubnetUtils
 import org.apache.http.conn.util.InetAddressUtils
 
+import scala.collection.mutable
 import scala.collection.mutable.ArrayBuffer
 import scala.concurrent.ops._
 
@@ -66,6 +67,8 @@ class ShadowsocksVpnService extends VpnService with BaseService {
 
   val PRIVATE_VLAN = "26.26.26.%s"
 
+  val AF_INET6 = 10
+
   var conn: ParcelFileDescriptor = null
   var notificationManager: NotificationManager = null
   var receiver: BroadcastReceiver = null
@@ -88,7 +91,7 @@ class ShadowsocksVpnService extends VpnService with BaseService {
             , "-l" , config.localPort.toString
             , "-k" , config.sitekey
             , "-m" , config.encMethod
-            , "-f" , (Path.BASE + "ss-local.pid"))
+            , "-f" , Path.BASE + "ss-local.pid")
     if (BuildConfig.DEBUG) Log.d(TAG, cmd.mkString(" "))
     Core.sslocal(cmd.toArray)
   }
@@ -126,11 +129,36 @@ class ShadowsocksVpnService extends VpnService with BaseService {
       .addAddress(PRIVATE_VLAN.format("1"), 24)
       .addDnsServer("8.8.8.8")
 
+    if (Build.VERSION.SDK_INT == Build.VERSION_CODES.LOLLIPOP) {
+      builder.allowFamily(AF_INET6)
+
+      if (config.isBypassApps) {
+        builder.addDisallowedApplication(this.getPackageName)
+      }
+
+      if (!config.isGlobalProxy) {
+        val apps = AppManager.getProxiedApps(this, config.proxiedAppString)
+        val uidSet: mutable.HashSet[String] = new mutable.HashSet[String]
+        for (app <- apps) {
+          if (app.proxied) {
+            uidSet.add(app.name)
+          }
+        }
+        for (uid <- uidSet) {
+          if (!config.isBypassApps) {
+            builder.addAllowedApplication(uid)
+          } else {
+            builder.addDisallowedApplication(uid)
+          }
+        }
+      }
+    }
+
     if (InetAddressUtils.isIPv6Address(config.proxy)) {
       builder.addRoute("0.0.0.0", 0)
     } else if (config.isGFWList) {
       val gfwList = {
-        if (Build.VERSION.SDK_INT == 19) {
+        if (Build.VERSION.SDK_INT == Build.VERSION_CODES.KITKAT) {
           getResources.getStringArray(R.array.simple_list)
         } else {
           getResources.getStringArray(R.array.gfw_list)