1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.net.netlink;
18
19import static android.net.netlink.NetlinkSocket.DEFAULT_RECV_BUFSIZE;
20import static android.system.OsConstants.NETLINK_ROUTE;
21import static org.junit.Assert.assertEquals;
22import static org.junit.Assert.assertNotNull;
23import static org.junit.Assert.assertTrue;
24
25import android.net.netlink.NetlinkSocket;
26import android.net.netlink.RtNetlinkNeighborMessage;
27import android.net.netlink.StructNdMsg;
28import android.net.netlink.StructNlMsgHdr;
29import android.support.test.runner.AndroidJUnit4;
30import android.support.test.filters.SmallTest;
31import android.system.ErrnoException;
32import android.system.NetlinkSocketAddress;
33import android.system.Os;
34import android.util.Log;
35import libcore.io.IoUtils;
36
37import java.io.InterruptedIOException;
38import java.io.FileDescriptor;
39import java.nio.ByteBuffer;
40import java.nio.ByteOrder;
41
42import org.junit.runner.RunWith;
43import org.junit.Test;
44
45
46@RunWith(AndroidJUnit4.class)
47@SmallTest
48public class NetlinkSocketTest {
49    private final String TAG = "NetlinkSocketTest";
50
51    @Test
52    public void testBasicWorkingGetNeighborsQuery() throws Exception {
53        final FileDescriptor fd = NetlinkSocket.forProto(NETLINK_ROUTE);
54        assertNotNull(fd);
55
56        NetlinkSocket.connectToKernel(fd);
57
58        final NetlinkSocketAddress localAddr = (NetlinkSocketAddress) Os.getsockname(fd);
59        assertNotNull(localAddr);
60        assertEquals(0, localAddr.getGroupsMask());
61        assertTrue(0 != localAddr.getPortId());
62
63        final int TEST_SEQNO = 5;
64        final byte[] req = RtNetlinkNeighborMessage.newGetNeighborsRequest(TEST_SEQNO);
65        assertNotNull(req);
66
67        final long TIMEOUT = 500;
68        assertEquals(req.length, NetlinkSocket.sendMessage(fd, req, 0, req.length, TIMEOUT));
69
70        int neighMessageCount = 0;
71        int doneMessageCount = 0;
72
73        while (doneMessageCount == 0) {
74            ByteBuffer response = NetlinkSocket.recvMessage(fd, DEFAULT_RECV_BUFSIZE, TIMEOUT);
75            assertNotNull(response);
76            assertTrue(StructNlMsgHdr.STRUCT_SIZE <= response.limit());
77            assertEquals(0, response.position());
78            assertEquals(ByteOrder.nativeOrder(), response.order());
79
80            // Verify the messages at least appears minimally reasonable.
81            while (response.remaining() > 0) {
82                final NetlinkMessage msg = NetlinkMessage.parse(response);
83                assertNotNull(msg);
84                final StructNlMsgHdr hdr = msg.getHeader();
85                assertNotNull(hdr);
86
87                if (hdr.nlmsg_type == NetlinkConstants.NLMSG_DONE) {
88                    doneMessageCount++;
89                    continue;
90                }
91
92                assertEquals(NetlinkConstants.RTM_NEWNEIGH, hdr.nlmsg_type);
93                assertTrue(msg instanceof RtNetlinkNeighborMessage);
94                assertTrue((hdr.nlmsg_flags & StructNlMsgHdr.NLM_F_MULTI) != 0);
95                assertEquals(TEST_SEQNO, hdr.nlmsg_seq);
96                assertEquals(localAddr.getPortId(), hdr.nlmsg_pid);
97
98                neighMessageCount++;
99            }
100        }
101
102        assertEquals(1, doneMessageCount);
103        // TODO: make sure this test passes sanely in airplane mode.
104        assertTrue(neighMessageCount > 0);
105
106        IoUtils.closeQuietly(fd);
107    }
108}
109