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/*
* Copyright (C) 2020 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.system.OsConstants.AF_INET;
import static android.system.OsConstants.AF_INET6;
import static android.system.OsConstants.IPPROTO_TCP;
import static android.system.OsConstants.IPPROTO_UDP;
import static android.system.OsConstants.SOCK_DGRAM;
import static android.system.OsConstants.SOCK_STREAM;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assume.assumeTrue;
import android.app.Instrumentation;
import android.content.Context;
import android.net.ConnectivityManager;
import android.os.Process;
import android.system.Os;
import androidx.test.InstrumentationRegistry;
import androidx.test.filters.SmallTest;
import androidx.test.runner.AndroidJUnit4;
import com.android.networkstack.apishim.common.ShimUtils;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import java.io.FileDescriptor;
import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.InetSocketAddress;
@RunWith(AndroidJUnit4.class)
@SmallTest
public class InetDiagSocketIntegrationTest {
private ConnectivityManager mCm;
private Context mContext;
@Before
public void setUp() throws Exception {
Instrumentation instrumentation = InstrumentationRegistry.getInstrumentation();
mContext = instrumentation.getTargetContext();
mCm = (ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
}
private class Connection {
public int socketDomain;
public int socketType;
public InetAddress localAddress;
public InetAddress remoteAddress;
public InetAddress localhostAddress;
public InetSocketAddress local;
public InetSocketAddress remote;
public int protocol;
public FileDescriptor localFd;
public FileDescriptor remoteFd;
public FileDescriptor createSocket() throws Exception {
return Os.socket(socketDomain, socketType, protocol);
}
Connection(String to, String from) throws Exception {
remoteAddress = InetAddress.getByName(to);
if (from != null) {
localAddress = InetAddress.getByName(from);
} else {
localAddress = (remoteAddress instanceof Inet4Address)
? Inet4Address.getByName("localhost") : Inet6Address.getByName("::");
}
if ((localAddress instanceof Inet4Address) && (remoteAddress instanceof Inet4Address)) {
socketDomain = AF_INET;
localhostAddress = Inet4Address.getByName("localhost");
} else {
socketDomain = AF_INET6;
localhostAddress = Inet6Address.getByName("::");
}
}
public void close() throws Exception {
Os.close(localFd);
}
}
private class TcpConnection extends Connection {
TcpConnection(String to, String from) throws Exception {
super(to, from);
protocol = IPPROTO_TCP;
socketType = SOCK_STREAM;
remoteFd = createSocket();
Os.bind(remoteFd, remoteAddress, 0);
Os.listen(remoteFd, 10);
int remotePort = ((InetSocketAddress) Os.getsockname(remoteFd)).getPort();
localFd = createSocket();
Os.bind(localFd, localAddress, 0);
Os.connect(localFd, remoteAddress, remotePort);
local = (InetSocketAddress) Os.getsockname(localFd);
remote = (InetSocketAddress) Os.getpeername(localFd);
}
public void close() throws Exception {
super.close();
Os.close(remoteFd);
}
}
private class UdpConnection extends Connection {
UdpConnection(String to, String from) throws Exception {
super(to, from);
protocol = IPPROTO_UDP;
socketType = SOCK_DGRAM;
remoteFd = null;
localFd = createSocket();
Os.bind(localFd, localAddress, 0);
Os.connect(localFd, remoteAddress, 7);
local = (InetSocketAddress) Os.getsockname(localFd);
remote = new InetSocketAddress(remoteAddress, 7);
}
}
private void checkConnectionOwnerUid(int protocol, InetSocketAddress local,
InetSocketAddress remote, boolean expectSuccess) {
final int uid = mCm.getConnectionOwnerUid(protocol, local, remote);
if (expectSuccess) {
assertEquals(Process.myUid(), uid);
} else {
assertNotEquals(Process.myUid(), uid);
}
}
private int findLikelyFreeUdpPort(UdpConnection conn) throws Exception {
UdpConnection udp = new UdpConnection(conn.remoteAddress.getHostAddress(),
conn.localAddress.getHostAddress());
final int localPort = udp.local.getPort();
udp.close();
return localPort;
}
/**
* Create a test connection for UDP and TCP sockets and verify that this
* {protocol, local, remote} socket result in receiving a valid UID.
*/
public void checkGetConnectionOwnerUid(String to, String from) throws Exception {
TcpConnection tcp = new TcpConnection(to, from);
checkConnectionOwnerUid(tcp.protocol, tcp.local, tcp.remote, true);
checkConnectionOwnerUid(IPPROTO_UDP, tcp.local, tcp.remote, false);
checkConnectionOwnerUid(tcp.protocol, new InetSocketAddress(0), tcp.remote, false);
checkConnectionOwnerUid(tcp.protocol, tcp.local, new InetSocketAddress(0), false);
tcp.close();
UdpConnection udp = new UdpConnection(to, from);
checkConnectionOwnerUid(udp.protocol, udp.local, udp.remote, true);
checkConnectionOwnerUid(IPPROTO_TCP, udp.local, udp.remote, false);
checkConnectionOwnerUid(udp.protocol, new InetSocketAddress(findLikelyFreeUdpPort(udp)),
udp.remote, false);
udp.close();
}
@Test
public void testGetConnectionOwnerUid() throws Exception {
// Skip the test for API <= Q, as b/141603906 this was only fixed in Q-QPR2
assumeTrue(ShimUtils.isAtLeastR());
checkGetConnectionOwnerUid("::", null);
checkGetConnectionOwnerUid("::", "::");
checkGetConnectionOwnerUid("0.0.0.0", null);
checkGetConnectionOwnerUid("0.0.0.0", "0.0.0.0");
checkGetConnectionOwnerUid("127.0.0.1", null);
checkGetConnectionOwnerUid("127.0.0.1", "127.0.0.2");
checkGetConnectionOwnerUid("::1", null);
checkGetConnectionOwnerUid("::1", "::1");
}
/* Verify fix for b/141603906 */
@Test
public void testB141603906() throws Exception {
// Skip the test for API <= Q, as b/141603906 this was only fixed in Q-QPR2
assumeTrue(ShimUtils.isAtLeastR());
final InetSocketAddress src = new InetSocketAddress(0);
final InetSocketAddress dst = new InetSocketAddress(0);
final int numThreads = 8;
final int numSockets = 5000;
final Thread[] threads = new Thread[numThreads];
for (int i = 0; i < numThreads; i++) {
threads[i] = new Thread(() -> {
for (int j = 0; j < numSockets; j++) {
mCm.getConnectionOwnerUid(IPPROTO_TCP, src, dst);
}
});
}
for (Thread thread : threads) {
thread.start();
}
for (Thread thread : threads) {
thread.join();
}
}
}
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