Add global change ethernet state API

Provide a new API to enable or disable ethernet. Also have a listener
for call to check whether enable state is sucessful.

Bug: 171872016
Test: atest EthernetServiceTests

Change-Id: Iee4b48511ff668a2a7df90fd9bfe563d7ff23940
Merged-In: Iee4b48511ff668a2a7df90fd9bfe563d7ff23940

service-t/src/com/android/server/ethernet/EthernetNetworkFactory.java

@@ -183,7 +183,8 @@ public class EthernetNetworkFactory extends NetworkFactory {
      * Returns an array of available interface names. The array is sorted: unrestricted interfaces
      * goes first, then sorted by name.
      */
-    String[] getAvailableInterfaces(boolean includeRestricted) {
+    @VisibleForTesting(visibility = VisibleForTesting.Visibility.PACKAGE)
+    protected String[] getAvailableInterfaces(boolean includeRestricted) {
         return mTrackingInterfaces.values()
                 .stream()
                 .filter(iface -> !iface.isRestricted() || includeRestricted)
@@ -195,7 +196,8 @@ public class EthernetNetworkFactory extends NetworkFactory {
                 .toArray(String[]::new);
     }
 
-    void addInterface(@NonNull final String ifaceName, @NonNull final String hwAddress,
+    @VisibleForTesting(visibility = VisibleForTesting.Visibility.PACKAGE)
+    protected void addInterface(@NonNull final String ifaceName, @NonNull final String hwAddress,
             @NonNull final IpConfiguration ipConfig,
             @NonNull final NetworkCapabilities capabilities) {
         if (mTrackingInterfaces.containsKey(ifaceName)) {
@@ -282,7 +284,8 @@ public class EthernetNetworkFactory extends NetworkFactory {
                 .addTransportType(NetworkCapabilities.TRANSPORT_ETHERNET).build();
     }
 
-    void removeInterface(String interfaceName) {
+    @VisibleForTesting(visibility = VisibleForTesting.Visibility.PACKAGE)
+    protected void removeInterface(String interfaceName) {
         NetworkInterfaceState iface = mTrackingInterfaces.remove(interfaceName);
         if (iface != null) {
             iface.maybeSendNetworkManagementCallbackForAbort();

service-t/src/com/android/server/ethernet/EthernetServiceImpl.java

@@ -281,4 +281,12 @@ public class EthernetServiceImpl extends IEthernetManager.Stub {
 
         mTracker.disconnectNetwork(iface, listener);
     }
+
+    @Override
+    public void setEthernetEnabled(boolean enabled) {
+        PermissionUtils.enforceNetworkStackPermissionOr(mContext,
+                android.Manifest.permission.NETWORK_SETTINGS);
+
+        mTracker.setEthernetEnabled(enabled);
+    }
 }

service-t/src/com/android/server/ethernet/EthernetTracker.java

@@ -16,6 +16,8 @@
 
 package com.android.server.ethernet;
 
+import static android.net.EthernetManager.ETHERNET_STATE_DISABLED;
+import static android.net.EthernetManager.ETHERNET_STATE_ENABLED;
 import static android.net.TestNetworkManager.TEST_TAP_PREFIX;
 
 import static com.android.internal.annotations.VisibleForTesting.Visibility.PACKAGE;
@@ -119,6 +121,8 @@ public class EthernetTracker {
     private boolean mTetheredInterfaceWasAvailable = false;
     private volatile IpConfiguration mIpConfigForDefaultInterface;
 
+    private int mEthernetState = ETHERNET_STATE_ENABLED;
+
     private class TetheredInterfaceRequestList extends
             RemoteCallbackList<ITetheredInterfaceCallback> {
         @Override
@@ -355,6 +359,8 @@ public class EthernetTracker {
             for (String iface : getInterfaces(canUseRestrictedNetworks)) {
                 unicastInterfaceStateChange(listener, iface);
             }
+
+            unicastEthernetStateChange(listener, mEthernetState);
         });
     }
 
@@ -825,6 +831,53 @@ public class EthernetTracker {
         }
     }
 
+    @VisibleForTesting(visibility = PACKAGE)
+    protected void setEthernetEnabled(boolean enabled) {
+        mHandler.post(() -> {
+            int newState = enabled ? ETHERNET_STATE_ENABLED : ETHERNET_STATE_DISABLED;
+            if (mEthernetState == newState) return;
+
+            mEthernetState = newState;
+
+            if (enabled) {
+                trackAvailableInterfaces();
+            } else {
+                // TODO: maybe also disable server mode interface as well.
+                untrackFactoryInterfaces();
+            }
+            broadcastEthernetStateChange(mEthernetState);
+        });
+    }
+
+    private void untrackFactoryInterfaces() {
+        for (String iface : mFactory.getAvailableInterfaces(true /* includeRestricted */)) {
+            stopTrackingInterface(iface);
+        }
+    }
+
+    private void unicastEthernetStateChange(@NonNull IEthernetServiceListener listener,
+            int state) {
+        ensureRunningOnEthernetServiceThread();
+        try {
+            listener.onEthernetStateChanged(state);
+        } catch (RemoteException e) {
+            // Do nothing here.
+        }
+    }
+
+    private void broadcastEthernetStateChange(int state) {
+        ensureRunningOnEthernetServiceThread();
+        final int n = mListeners.beginBroadcast();
+        for (int i = 0; i < n; i++) {
+            try {
+                mListeners.getBroadcastItem(i).onEthernetStateChanged(state);
+            } catch (RemoteException e) {
+                // Do nothing here.
+            }
+        }
+        mListeners.finishBroadcast();
+    }
+
     void dump(FileDescriptor fd, IndentingPrintWriter pw, String[] args) {
         postAndWaitForRunnable(() -> {
             pw.println(getClass().getSimpleName());