Make public Network#bindSocket(FileDescriptor).

Code that uses android.system.Os to create sockets as FileDescriptors
should be able to bind them to networks.  Note that FileDescriptors
could already be marked as "protected from VPNs" via
NetworkUtils#protectFromVpn(), but heretofore were not easily bound
to any particular network.

Bug: 21449922
Change-Id: I4bb86db5d95d5a55bb2d7e245848d11eaa351e65

1 files changed, 96 insertions, 0 deletions

diff --git a/core/tests/coretests/src/android/net/NetworkTest.java b/core/tests/coretests/src/android/net/NetworkTest.java
new file mode 100644
index 0000000..b0ecb04
--- /dev/null
+++ b/core/tests/coretests/src/android/net/NetworkTest.java
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.net;
+
+import android.net.LocalServerSocket;
+import android.net.LocalSocket;
+import android.net.LocalSocketAddress;
+import android.net.Network;
+import android.test.suitebuilder.annotation.SmallTest;
+import java.io.File;
+import java.io.FileDescriptor;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.net.Inet6Address;
+import java.net.SocketException;
+import junit.framework.TestCase;
+
+public class NetworkTest extends TestCase {
+    final Network mNetwork = new Network(99);
+
+    @SmallTest
+    public void testBindSocketOfInvalidFdThrows() throws Exception {
+
+        final FileDescriptor fd = new FileDescriptor();
+        assertFalse(fd.valid());
+
+        try {
+            mNetwork.bindSocket(fd);
+            fail("SocketException not thrown");
+        } catch (SocketException expected) {}
+    }
+
+    @SmallTest
+    public void testBindSocketOfNonSocketFdThrows() throws Exception {
+        final File devNull = new File("/dev/null");
+        assertTrue(devNull.canRead());
+
+        final FileInputStream fis = new FileInputStream(devNull);
+        assertTrue(null != fis.getFD());
+        assertTrue(fis.getFD().valid());
+
+        try {
+            mNetwork.bindSocket(fis.getFD());
+            fail("SocketException not thrown");
+        } catch (SocketException expected) {}
+    }
+
+    @SmallTest
+    public void testBindSocketOfConnectedDatagramSocketThrows() throws Exception {
+        final DatagramSocket mDgramSocket = new DatagramSocket(0, (InetAddress) Inet6Address.ANY);
+        mDgramSocket.connect((InetAddress) Inet6Address.LOOPBACK, 53);
+        assertTrue(mDgramSocket.isConnected());
+
+        try {
+            mNetwork.bindSocket(mDgramSocket);
+            fail("SocketException not thrown");
+        } catch (SocketException expected) {}
+    }
+
+    @SmallTest
+    public void testBindSocketOfLocalSocketThrows() throws Exception {
+        final LocalSocket mLocalClient = new LocalSocket();
+        mLocalClient.bind(new LocalSocketAddress("testClient"));
+        assertTrue(mLocalClient.getFileDescriptor().valid());
+
+        try {
+            mNetwork.bindSocket(mLocalClient.getFileDescriptor());
+            fail("SocketException not thrown");
+        } catch (SocketException expected) {}
+
+        final LocalServerSocket mLocalServer = new LocalServerSocket("testServer");
+        mLocalClient.connect(mLocalServer.getLocalSocketAddress());
+        assertTrue(mLocalClient.isConnected());
+
+        try {
+            mNetwork.bindSocket(mLocalClient.getFileDescriptor());
+            fail("SocketException not thrown");
+        } catch (SocketException expected) {}
+    }
+}