Merge changes I5c994de5,I6cb0dd84 into mnc-dev

* changes:
  Add a test for public bugs 2111 and 2136.
  Always check off-link connectivity in NetworkDiagnostics.

Author: lcolitti

core/java/android/net/LinkProperties.java

@@ -661,6 +661,17 @@ public boolean hasIPv4Address() {
         return false;
     }
 
+    /**
+     * Returns true if this link or any of its stacked interfaces has an IPv4 address.
+     *
+     * @return {@code true} if there is an IPv4 address, {@code false} otherwise.
+     */
+    private boolean hasIPv4AddressOnInterface(String iface) {
+        return (mIfaceName.equals(iface) && hasIPv4Address()) ||
+                (iface != null && mStackedLinks.containsKey(iface) &&
+                        mStackedLinks.get(iface).hasIPv4Address());
+    }
+
     /**
      * Returns true if this link has a global preferred IPv6 address.
      *
@@ -792,7 +803,7 @@ public boolean isReachable(InetAddress ip) {
 
         if (ip instanceof Inet4Address) {
             // For IPv4, it suffices for now to simply have any address.
-            return hasIPv4Address();
+            return hasIPv4AddressOnInterface(bestRoute.getInterface());
         } else if (ip instanceof Inet6Address) {
             if (ip.isLinkLocalAddress()) {
                 // For now, just make sure link-local destinations have

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

@@ -1772,7 +1772,7 @@ protected void dump(FileDescriptor fd, PrintWriter writer, String[] args) {
                 // Start gathering diagnostic information.
                 netDiags.add(new NetworkDiagnostics(
                         nai.network,
-                        new LinkProperties(nai.linkProperties),
+                        new LinkProperties(nai.linkProperties),  // Must be a copy.
                         DIAG_TIME_MS));
             }
 

services/core/java/com/android/server/connectivity/NetworkDiagnostics.java

@@ -20,6 +20,7 @@
 
 import android.net.LinkProperties;
 import android.net.Network;
+import android.net.NetworkUtils;
 import android.net.RouteInfo;
 import android.os.SystemClock;
 import android.system.ErrnoException;
@@ -79,6 +80,10 @@
 public class NetworkDiagnostics {
     private static final String TAG = "NetworkDiagnostics";
 
+    private static final InetAddress TEST_DNS4 = NetworkUtils.numericToInetAddress("8.8.8.8");
+    private static final InetAddress TEST_DNS6 = NetworkUtils.numericToInetAddress(
+            "2001:4860:4860::8888");
+
     // For brevity elsewhere.
     private static final long now() {
         return SystemClock.elapsedRealtime();
@@ -156,6 +161,21 @@ public NetworkDiagnostics(Network network, LinkProperties lp, long timeoutMs) {
         mStartTime = now();
         mDeadlineTime = mStartTime + mTimeoutMs;
 
+        // Hardcode measurements to TEST_DNS4 and TEST_DNS6 in order to test off-link connectivity.
+        // We are free to modify mLinkProperties with impunity because ConnectivityService passes us
+        // a copy and not the original object. It's easier to do it this way because we don't need
+        // to check whether the LinkProperties already contains these DNS servers because
+        // LinkProperties#addDnsServer checks for duplicates.
+        if (mLinkProperties.isReachable(TEST_DNS4)) {
+            mLinkProperties.addDnsServer(TEST_DNS4);
+        }
+        // TODO: we could use mLinkProperties.isReachable(TEST_DNS6) here, because we won't set any
+        // DNS servers for which isReachable() is false, but since this is diagnostic code, be extra
+        // careful.
+        if (mLinkProperties.hasGlobalIPv6Address() || mLinkProperties.hasIPv6DefaultRoute()) {
+            mLinkProperties.addDnsServer(TEST_DNS6);
+        }
+
         for (RouteInfo route : mLinkProperties.getRoutes()) {
             if (route.hasGateway()) {
                 prepareIcmpMeasurement(route.getGateway());

services/tests/servicestests/src/android/net/dhcp/DhcpPacketTest.java

@@ -21,12 +21,13 @@
 import android.net.LinkAddress;
 import android.system.OsConstants;
 import android.test.suitebuilder.annotation.SmallTest;
-import junit.framework.TestCase;
+import com.android.internal.util.HexDump;
 
 import java.net.Inet4Address;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
 
+import junit.framework.TestCase;
 import libcore.util.HexEncoding;
 
 import static android.net.dhcp.DhcpPacket.*;
@@ -370,4 +371,69 @@ public void testPadAndOverloadedOptionsOffer() throws Exception {
         assertDhcpResults("172.17.152.118/16", "172.17.1.1", "172.17.1.1",
                 null, "1.1.1.1", null, 43200, false, dhcpResults);
     }
+
+    @SmallTest
+    public void testBug2111() throws Exception {
+        final ByteBuffer packet = ByteBuffer.wrap(HexEncoding.decode((
+            // IP header.
+            "4500014c00000000ff119beac3eaf3880a3f5d04" +
+            // UDP header. TODO: fix invalid checksum (due to MAC address obfuscation).
+            "0043004401387464" +
+            // BOOTP header.
+            "0201060002554812000a0000000000000a3f5d040000000000000000" +
+            // MAC address.
+            "00904c00000000000000000000000000" +
+            // Server name.
+            "0000000000000000000000000000000000000000000000000000000000000000" +
+            "0000000000000000000000000000000000000000000000000000000000000000" +
+            // File.
+            "0000000000000000000000000000000000000000000000000000000000000000" +
+            "0000000000000000000000000000000000000000000000000000000000000000" +
+            "0000000000000000000000000000000000000000000000000000000000000000" +
+            "0000000000000000000000000000000000000000000000000000000000000000" +
+            // Options.
+            "638253633501023604c00002fe33040000bfc60104fffff00003040a3f50010608c0000201c0000202" +
+            "0f0f646f6d61696e3132332e636f2e756b0000000000ff00000000"
+        ).toCharArray(), false));
+
+        DhcpPacket offerPacket = DhcpPacket.decodeFullPacket(packet, ENCAP_L3);
+        assertTrue(offerPacket instanceof DhcpOfferPacket);
+        DhcpResults dhcpResults = offerPacket.toDhcpResults();
+        assertDhcpResults("10.63.93.4/20", "10.63.80.1", "192.0.2.1,192.0.2.2",
+                "domain123.co.uk", "192.0.2.254", null, 49094, false, dhcpResults);
+    }
+
+    @SmallTest
+    public void testBug2136() throws Exception {
+        final ByteBuffer packet = ByteBuffer.wrap(HexEncoding.decode((
+            // Ethernet header.
+            "bcf5ac000000d0c7890000000800" +
+            // IP header.
+            "4500014c00000000ff119beac3eaf3880a3f5d04" +
+            // UDP header. TODO: fix invalid checksum (due to MAC address obfuscation).
+            "0043004401387574" +
+            // BOOTP header.
+            "0201060163339a3000050000000000000a209ecd0000000000000000" +
+            // MAC address.
+            "bcf5ac00000000000000000000000000" +
+            // Server name.
+            "0000000000000000000000000000000000000000000000000000000000000000" +
+            "0000000000000000000000000000000000000000000000000000000000000000" +
+            // File.
+            "0000000000000000000000000000000000000000000000000000000000000000" +
+            "0000000000000000000000000000000000000000000000000000000000000000" +
+            "0000000000000000000000000000000000000000000000000000000000000000" +
+            "0000000000000000000000000000000000000000000000000000000000000000" +
+            // Options.
+            "6382536335010236040a20ff80330400001c200104fffff00003040a20900106089458413494584135" +
+            "0f0b6c616e63732e61632e756b000000000000000000ff00000000"
+        ).toCharArray(), false));
+
+        DhcpPacket offerPacket = DhcpPacket.decodeFullPacket(packet, ENCAP_L2);
+        assertTrue(offerPacket instanceof DhcpOfferPacket);
+        assertEquals("BCF5AC000000", HexDump.toHexString(offerPacket.getClientMac()));
+        DhcpResults dhcpResults = offerPacket.toDhcpResults();
+        assertDhcpResults("10.32.158.205/20", "10.32.144.1", "148.88.65.52,148.88.65.53",
+                "lancs.ac.uk", "10.32.255.128", null, 7200, false, dhcpResults);
+    }
 }