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/*
* 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.netlink;
import static android.net.netlink.NetlinkSocket.DEFAULT_RECV_BUFSIZE;
import static android.system.OsConstants.NETLINK_ROUTE;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import android.net.netlink.NetlinkSocket;
import android.net.netlink.RtNetlinkNeighborMessage;
import android.net.netlink.StructNlMsgHdr;
import android.system.NetlinkSocketAddress;
import android.system.Os;
import androidx.test.filters.SmallTest;
import androidx.test.runner.AndroidJUnit4;
import libcore.io.IoUtils;
import org.junit.Test;
import org.junit.runner.RunWith;
import java.io.FileDescriptor;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
@RunWith(AndroidJUnit4.class)
@SmallTest
public class NetlinkSocketTest {
private final String TAG = "NetlinkSocketTest";
@Test
public void testBasicWorkingGetNeighborsQuery() throws Exception {
final FileDescriptor fd = NetlinkSocket.forProto(NETLINK_ROUTE);
assertNotNull(fd);
NetlinkSocket.connectToKernel(fd);
final NetlinkSocketAddress localAddr = (NetlinkSocketAddress) Os.getsockname(fd);
assertNotNull(localAddr);
assertEquals(0, localAddr.getGroupsMask());
assertTrue(0 != localAddr.getPortId());
final int TEST_SEQNO = 5;
final byte[] req = RtNetlinkNeighborMessage.newGetNeighborsRequest(TEST_SEQNO);
assertNotNull(req);
final long TIMEOUT = 500;
assertEquals(req.length, NetlinkSocket.sendMessage(fd, req, 0, req.length, TIMEOUT));
int neighMessageCount = 0;
int doneMessageCount = 0;
while (doneMessageCount == 0) {
ByteBuffer response = NetlinkSocket.recvMessage(fd, DEFAULT_RECV_BUFSIZE, TIMEOUT);
assertNotNull(response);
assertTrue(StructNlMsgHdr.STRUCT_SIZE <= response.limit());
assertEquals(0, response.position());
assertEquals(ByteOrder.nativeOrder(), response.order());
// Verify the messages at least appears minimally reasonable.
while (response.remaining() > 0) {
final NetlinkMessage msg = NetlinkMessage.parse(response);
assertNotNull(msg);
final StructNlMsgHdr hdr = msg.getHeader();
assertNotNull(hdr);
if (hdr.nlmsg_type == NetlinkConstants.NLMSG_DONE) {
doneMessageCount++;
continue;
}
assertEquals(NetlinkConstants.RTM_NEWNEIGH, hdr.nlmsg_type);
assertTrue(msg instanceof RtNetlinkNeighborMessage);
assertTrue((hdr.nlmsg_flags & StructNlMsgHdr.NLM_F_MULTI) != 0);
assertEquals(TEST_SEQNO, hdr.nlmsg_seq);
assertEquals(localAddr.getPortId(), hdr.nlmsg_pid);
neighMessageCount++;
}
}
assertEquals(1, doneMessageCount);
// TODO: make sure this test passes sanely in airplane mode.
assertTrue(neighMessageCount > 0);
IoUtils.closeQuietly(fd);
}
}
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