MAC randomization: getFactoryMacAddresses API

API to get the factory MAC addresses. Not for use by third party apps.

Bug: 111634904
Test: unit tests

Change-Id: I9258889b963886b79191b9ea1e7aa70ffb4eb6ad

wifi/java/android/net/wifi/IWifiManager.aidl

@@ -193,5 +193,7 @@ interface IWifiManager
     int addNetworkSuggestions(in List<WifiNetworkSuggestion> networkSuggestions, in String packageName);
 
     int removeNetworkSuggestions(in List<WifiNetworkSuggestion> networkSuggestions, in String packageName);
+
+    String[] getFactoryMacAddresses();
 }
 

wifi/java/android/net/wifi/WifiManager.java

@@ -4427,4 +4427,19 @@ public class WifiManager {
     public boolean isOweSupported() {
         return isFeatureSupported(WIFI_FEATURE_OWE);
     }
+
+    /**
+     * Gets the factory Wi-Fi MAC addresses.
+     * @return Array of String representing Wi-Fi MAC addresses sorted lexically or an empty Array
+     * if failed.
+     * @hide
+     */
+    @RequiresPermission(android.Manifest.permission.NETWORK_SETTINGS)
+    public String[] getFactoryMacAddresses() {
+        try {
+            return mService.getFactoryMacAddresses();
+        } catch (RemoteException e) {
+            throw e.rethrowFromSystemServer();
+        }
+    }
 }

wifi/java/com/android/server/wifi/AbstractWifiService.java

@@ -452,4 +452,9 @@ public abstract class AbstractWifiService extends IWifiManager.Stub {
             List<WifiNetworkSuggestion> networkSuggestions, String callingPackageName) {
         throw new UnsupportedOperationException();
     }
+
+    @Override
+    public String[] getFactoryMacAddresses() {
+        throw new UnsupportedOperationException();
+    }
 }

wifi/tests/src/android/net/wifi/WifiManagerTest.java

@@ -29,6 +29,7 @@ import static android.net.wifi.WifiManager.WIFI_AP_STATE_ENABLED;
 import static android.net.wifi.WifiManager.WIFI_AP_STATE_ENABLING;
 import static android.net.wifi.WifiManager.WIFI_AP_STATE_FAILED;
 
+import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
@@ -88,6 +89,7 @@ public class WifiManagerTest {
     private static final int TEST_UID = 14553;
     private static final String TEST_PACKAGE_NAME = "TestPackage";
     private static final String TEST_COUNTRY_CODE = "US";
+    private static final String[] TEST_MAC_ADDRESSES = {"da:a1:19:0:0:0"};
 
     @Mock Context mContext;
     @Mock
@@ -1320,4 +1322,15 @@ i     * Verify that a call to cancel WPS immediately returns a failure.
         assertEquals(WifiManager.NETWORK_SUGGESTIONS_MAX_PER_APP,
                 mWifiManager.getMaxNumberOfNetworkSuggestionsPerApp());
     }
+
+    /**
+     * Verify getting the factory MAC address.
+     * @throws Exception
+     */
+    @Test
+    public void testGetFactoryMacAddress() throws Exception {
+        when(mWifiService.getFactoryMacAddresses()).thenReturn(TEST_MAC_ADDRESSES);
+        assertArrayEquals(TEST_MAC_ADDRESSES, mWifiManager.getFactoryMacAddresses());
+        verify(mWifiService).getFactoryMacAddresses();
+    }
 }