Add a hasMacAddress member to InterfaceParams.

This is a convenience function for callers who would like to know
whether the interface has a MAC address. It is needed because the
constructed object will have a MAC address of 02:00:00:00:00:00
if the interface did not have a MAC address.

Test: added minimal unit test coverage
Change-Id: I422422d032afbbabcf8594def76702bb053f0a96

1 files changed, 3 insertions, 1 deletions

diff --git a/common/moduleutils/src/android/net/util/InterfaceParams.java b/common/moduleutils/src/android/net/util/InterfaceParams.java
index 3ba02b5..7e05a8d 100644
--- a/common/moduleutils/src/android/net/util/InterfaceParams.java
+++ b/common/moduleutils/src/android/net/util/InterfaceParams.java
@@ -38,6 +38,7 @@ import java.net.SocketException;
 public class InterfaceParams {
     public final String name;
     public final int index;
+    public final boolean hasMacAddress;
     public final MacAddress macAddr;
     public final int defaultMtu;
 
@@ -69,7 +70,8 @@ public class InterfaceParams {
         checkArgument((index > 0), "invalid interface index");
         this.name = name;
         this.index = index;
-        this.macAddr = (macAddr != null) ? macAddr : MacAddress.fromBytes(new byte[] {
+        this.hasMacAddress = (macAddr != null);
+        this.macAddr = hasMacAddress ? macAddr : MacAddress.fromBytes(new byte[] {
                 0x02, 0x00, 0x00, 0x00, 0x00, 0x00 });
         this.defaultMtu = (defaultMtu > IPV6_MIN_MTU) ? defaultMtu : IPV6_MIN_MTU;
     }