Pass DNS server info notifications to observers.

These are sent if the device receives IPv6 Router Advertisements
with DNS server configuration options. Currently, nothing listens
to them; in a future change we will use them as IPv6 DNS servers.

[Cherry-pick of 416740ad4d9132005a71dc0883334e852235a18a]

Bug: 9180552
Change-Id: I05000c0cd3867a68ab390102e8470b6912a9d3aa

2 files changed, 14 insertions, 0 deletions

diff --git a/core/java/android/net/INetworkManagementEventObserver.aidl b/core/java/android/net/INetworkManagementEventObserver.aidl
index b76e4c2..c720c7b 100644
--- a/core/java/android/net/INetworkManagementEventObserver.aidl
+++ b/core/java/android/net/INetworkManagementEventObserver.aidl
@@ -90,4 +90,13 @@ interface INetworkManagementEventObserver {
      * @param active  True if the interface is actively transmitting data, false if it is idle.
      */
     void interfaceClassDataActivityChanged(String label, boolean active);
+
+    /**
+     * Information about available DNS servers has been received.
+     *
+     * @param iface The interface on which the information was received.
+     * @param lifetime The time in seconds for which the DNS servers may be used.
+     * @param servers The IP addresses of the DNS servers.
+     */
+    void interfaceDnsServerInfo(String iface, long lifetime, in String[] servers);
 }
diff --git a/core/java/com/android/server/net/BaseNetworkObserver.java b/core/java/com/android/server/net/BaseNetworkObserver.java
index fa54c5f..a02c602 100644
--- a/core/java/com/android/server/net/BaseNetworkObserver.java
+++ b/core/java/com/android/server/net/BaseNetworkObserver.java
@@ -64,4 +64,9 @@ public class BaseNetworkObserver extends INetworkManagementEventObserver.Stub {
     public void limitReached(String limitName, String iface) {
         // default no-op
     }
+
+    @Override
+    public void interfaceDnsServerInfo(String iface, long lifetime, String[] servers) {
+        // default no-op
+    }
 }