Merge "provide a resource overlay to configure customized DNS Server."

packages/NetworkStack/res/values/config.xml

@@ -35,4 +35,8 @@
     </string-array>
     <string-array name="config_captive_portal_fallback_probe_specs" translatable="false">
     </string-array>
-</resources>
+
+    <!-- Customized default DNS Servers address. -->
+    <string-array name="config_default_dns_servers" translatable="false">
+    </string-array>
+</resources>

packages/NetworkStack/src/android/net/dhcp/DhcpClient.java

@@ -45,6 +45,7 @@ import static com.android.server.util.NetworkStackConstants.IPV4_ADDR_ANY;
 
 import android.content.Context;
 import android.net.DhcpResults;
+import android.net.InetAddresses;
 import android.net.TrafficStats;
 import android.net.ip.IpClient;
 import android.net.metrics.DhcpClientEvent;
@@ -66,6 +67,7 @@ import com.android.internal.util.MessageUtils;
 import com.android.internal.util.State;
 import com.android.internal.util.StateMachine;
 import com.android.internal.util.WakeupMessage;
+import com.android.networkstack.R;
 
 import java.io.FileDescriptor;
 import java.io.IOException;
@@ -498,6 +500,18 @@ public class DhcpClient extends StateMachine {
 
     private void acceptDhcpResults(DhcpResults results, String msg) {
         mDhcpLease = results;
+        if (mDhcpLease.dnsServers.isEmpty()) {
+            // supplement customized dns servers
+            String[] dnsServersList =
+                    mContext.getResources().getStringArray(R.array.config_default_dns_servers);
+            for (final String dnsServer : dnsServersList) {
+                try {
+                    mDhcpLease.dnsServers.add(InetAddresses.parseNumericAddress(dnsServer));
+                } catch (IllegalArgumentException e) {
+                    Log.e(TAG, "Invalid default DNS server: " + dnsServer, e);
+                }
+            }
+        }
         mOffer = null;
         Log.d(TAG, msg + " lease: " + mDhcpLease);
         notifySuccess();