Add ConnectivityManager.getNetworkWatchlistConfigHash()

Apps can use this API to get network watchlist config hash for auditing.

Bug: 63908748
Test: Able to compile
Change-Id: I5ce9e6bb6dad88139c0a102da58be0dd7c284b7a

core/java/android/net/ConnectivityManager.java

@@ -3763,4 +3763,20 @@ public class ConnectivityManager {
             throw e.rethrowFromSystemServer();
         }
     }
+
+    /**
+     * The network watchlist is a list of domains and IP addresses that are associated with
+     * potentially harmful apps. This method returns the hash of the watchlist currently
+     * used by the system.
+     *
+     * @return Hash of network watchlist config file. Null if config does not exist.
+     */
+    public byte[] getNetworkWatchlistConfigHash() {
+        try {
+            return mService.getNetworkWatchlistConfigHash();
+        } catch (RemoteException e) {
+            Log.e(TAG, "Unable to get watchlist config hash");
+            throw e.rethrowFromSystemServer();
+        }
+    }
 }

core/java/android/net/IConnectivityManager.aidl

@@ -180,4 +180,6 @@ interface IConnectivityManager
     void stopKeepalive(in Network network, int slot);
 
     String getCaptivePortalServerUrl();
+
+    byte[] getNetworkWatchlistConfigHash();
 }

services/core/java/com/android/server/ConnectivityService.java

@@ -69,6 +69,7 @@ import android.net.NetworkRequest;
 import android.net.NetworkSpecifier;
 import android.net.NetworkState;
 import android.net.NetworkUtils;
+import android.net.NetworkWatchlistManager;
 import android.net.Proxy;
 import android.net.ProxyInfo;
 import android.net.RouteInfo;
@@ -5708,6 +5709,17 @@ public class ConnectivityService extends IConnectivityManager.Stub
                 Settings.Global.NETWORK_AVOID_BAD_WIFI, null);
     }
 
+    @Override
+    public byte[] getNetworkWatchlistConfigHash() {
+        NetworkWatchlistManager nwm = mContext.getSystemService(NetworkWatchlistManager.class);
+        if (nwm == null) {
+            loge("Unable to get NetworkWatchlistManager");
+            return null;
+        }
+        // Redirect it to network watchlist service to access watchlist file and calculate hash.
+        return nwm.getWatchlistConfigHash();
+    }
+
     @VisibleForTesting
     public NetworkMonitor createNetworkMonitor(Context context, Handler handler,
             NetworkAgentInfo nai, NetworkRequest defaultRequest) {