disable NAT mode again

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

@@ -338,13 +338,15 @@ class Shadowsocks
 
     Console.runCommand(ab.toArray)
 
-    ab.clear()
-    ab.append("kill -9 `cat /data/data/com.github.shadowsocks/redsocks.pid`")
-    ab.append("rm /data/data/com.github.shadowsocks/redsocks.conf")
-    ab.append("rm /data/data/com.github.shadowsocks/redsocks.pid")
-    ab.append(Utils.getIptables + " -t nat -F OUTPUT")
+    if (!Utils.isLollipopOrAbove) {
+      ab.clear()
+      ab.append("kill -9 `cat /data/data/com.github.shadowsocks/redsocks.pid`")
+      ab.append("rm /data/data/com.github.shadowsocks/redsocks.conf")
+      ab.append("rm /data/data/com.github.shadowsocks/redsocks.pid")
+      ab.append(Utils.getIptables + " -t nat -F OUTPUT")
 
-    Console.runRootCommand(ab.toArray)
+      Console.runRootCommand(ab.toArray)
+    }
   }
 
   private def getVersionName: String = {
@@ -500,7 +502,7 @@ class Shadowsocks
 
     // Bind to the service
     spawn {
-      val isRoot = Console.isRoot
+      val isRoot = !Utils.isLollipopOrAbove && Console.isRoot
       handler.post(new Runnable {
         override def run() {
           status.edit.putBoolean(Key.isRoot, isRoot).commit()
@@ -770,7 +772,7 @@ class Shadowsocks
       if (pref != null) {
         if (Seq(Key.isGlobalProxy, Key.proxyedApps)
           .contains(name)) {
-          pref.setEnabled(enabled && !isVpnEnabled)
+          pref.setEnabled(enabled && (Utils.isLollipopOrAbove || !isVpnEnabled))
         } else {
           pref.setEnabled(enabled)
         }

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

@@ -72,7 +72,7 @@ class ShadowsocksRunnerActivity extends Activity {
 
   def isVpnEnabled: Boolean = {
     if (vpnEnabled < 0) {
-      vpnEnabled = if (!Console.isRoot) {
+      vpnEnabled = if (Utils.isLollipopOrAbove || !Console.isRoot) {
         1
       } else {
         0

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

@@ -74,14 +74,6 @@ class ShadowsocksVpnService extends VpnService with BaseService {
 
   private lazy val application = getApplication.asInstanceOf[ShadowsocksApplication]
 
-  def isLollipopOrAbove: Boolean = {
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-      true
-    } else {
-      false
-    }
-  }
-
   def isByass(net: SubnetUtils): Boolean = {
     val info = net.getInfo
     info.isInRange(config.proxy)
@@ -105,7 +97,7 @@ class ShadowsocksVpnService extends VpnService with BaseService {
 
   def startShadowsocksDaemon() {
 
-    if (isLollipopOrAbove && config.route != Route.ALL) {
+    if (Utils.isLollipopOrAbove && config.route != Route.ALL) {
       val acl: Array[String] = config.route match {
         case Route.BYPASS_LAN => getResources.getStringArray(R.array.private_route)
         case Route.BYPASS_CHN => getResources.getStringArray(R.array.chn_route_full)
@@ -125,7 +117,7 @@ class ShadowsocksVpnService extends VpnService with BaseService {
       , "-m", config.encMethod
       , "-f", Path.BASE + "ss-local.pid")
 
-    if (isLollipopOrAbove && config.route != Route.ALL) {
+    if (Utils.isLollipopOrAbove && config.route != Route.ALL) {
       cmd += "--acl"
       cmd += (Path.BASE + "acl.list")
     }
@@ -151,7 +143,7 @@ class ShadowsocksVpnService extends VpnService with BaseService {
 
   def startDnsDaemon() {
     val conf = {
-      if (isLollipopOrAbove) {
+      if (Utils.isLollipopOrAbove) {
         ConfigUtils.PDNSD_BYPASS.format("0.0.0.0", getString(R.string.exclude), 8163)
       } else {
         ConfigUtils.PDNSD_LOCAL.format("0.0.0.0", 8163)
@@ -186,7 +178,7 @@ class ShadowsocksVpnService extends VpnService with BaseService {
       .addAddress(PRIVATE_VLAN.format("1"), 24)
       .addDnsServer("8.8.8.8")
 
-    if (isLollipopOrAbove) {
+    if (Utils.isLollipopOrAbove) {
       if (!config.isGlobalProxy) {
         val apps = AppManager.getProxiedApps(this, config.proxiedAppString)
         val pkgSet: mutable.HashSet[String] = new mutable.HashSet[String]
@@ -214,7 +206,7 @@ class ShadowsocksVpnService extends VpnService with BaseService {
     if (InetAddressUtils.isIPv6Address(config.proxy)) {
       builder.addRoute("0.0.0.0", 0)
     } else {
-      if (!isLollipopOrAbove) {
+      if (!Utils.isLollipopOrAbove) {
         config.route match {
           case Route.ALL =>
             for (i <- 1 to 223) {

src/main/scala/com/github/shadowsocks/utils/Utils.scala

@@ -80,6 +80,14 @@ object Utils {
   var data_path: String = null
   var rootTries = 0
 
+  def isLollipopOrAbove: Boolean = {
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+      true
+    } else {
+      false
+    }
+  }
+
   def getSignature(context: Context): String = {
     val info = context
       .getPackageManager