Add getInterfaceList API implementation in Ethernet service.

Bug: 171872016
Test: m
Merged-In: I8eeb2cd211c6a2ec6bc997c5e18995b585c6118a
Change-Id: Ic36d26be7dae5fd3f72abce3cea1ee845813a6e5

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

@@ -41,6 +41,7 @@ import com.android.net.module.util.PermissionUtils;
 
 import java.io.FileDescriptor;
 import java.io.PrintWriter;
+import java.util.List;
 import java.util.Objects;
 import java.util.concurrent.atomic.AtomicBoolean;
 
@@ -289,4 +290,10 @@ public class EthernetServiceImpl extends IEthernetManager.Stub {
 
         mTracker.setEthernetEnabled(enabled);
     }
+
+    @Override
+    public List<String> getInterfaceList() {
+        PermissionUtils.enforceAccessNetworkStatePermission(mContext, TAG);
+        return mTracker.getInterfaceList();
+    }
 }

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

@@ -57,6 +57,7 @@ import com.android.net.module.util.PermissionUtils;
 import java.io.FileDescriptor;
 import java.net.InetAddress;
 import java.util.ArrayList;
+import java.util.List;
 import java.util.Objects;
 import java.util.concurrent.ConcurrentHashMap;
 
@@ -90,7 +91,7 @@ public class EthernetTracker {
      * Interface names we track. This is a product-dependent regular expression, plus,
      * if setIncludeTestInterfaces is true, any test interfaces.
      */
-    private String mIfaceMatch;
+    private volatile String mIfaceMatch;
     /**
      * Track test interfaces if true, don't track otherwise.
      */
@@ -341,6 +342,22 @@ public class EthernetTracker {
         return mFactory.getAvailableInterfaces(includeRestricted);
     }
 
+    List<String> getInterfaceList() {
+        final List<String> interfaceList = new ArrayList<String>();
+        final String[] ifaces;
+        try {
+            ifaces = mNetd.interfaceGetList();
+        } catch (RemoteException e) {
+            Log.e(TAG, "Could not get list of interfaces " + e);
+            return interfaceList;
+        }
+        final String ifaceMatch = mIfaceMatch;
+        for (String iface : ifaces) {
+            if (iface.matches(ifaceMatch)) interfaceList.add(iface);
+        }
+        return interfaceList;
+    }
+
     /**
      * Returns true if given interface was configured as restricted (doesn't have
      * NET_CAPABILITY_NOT_RESTRICTED) capability. Otherwise, returns false.