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/*
* Copyright (C) 2016 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.shared;
import static android.net.INetd.LOCAL_NET_ID;
import static android.system.OsConstants.EBUSY;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
import static org.mockito.Matchers.any;
import static org.mockito.Matchers.anyInt;
import static org.mockito.Matchers.anyString;
import static org.mockito.Matchers.eq;
import static org.mockito.Mockito.doAnswer;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.reset;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.verifyNoMoreInteractions;
import android.net.INetd;
import android.net.IpPrefix;
import android.os.RemoteException;
import android.os.ServiceSpecificException;
import androidx.test.filters.SmallTest;
import androidx.test.runner.AndroidJUnit4;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
@RunWith(AndroidJUnit4.class)
@SmallTest
public final class NetdUtilsTest {
private static final String IFACE_NAME = "testnet1";
private static final IpPrefix TEST_IPPREFIX = new IpPrefix("192.168.42.1/24");
@Mock private INetd mNetd;
@Before public void setUp() throws Exception {
MockitoAnnotations.initMocks(this);
}
private void setNetworkAddInterfaceOutcome(final Exception cause, int numLoops)
throws Exception {
// This cannot be an int because local variables referenced from a lambda expression must
// be final or effectively final.
final Counter myCounter = new Counter();
doAnswer((invocation) -> {
myCounter.count();
if (myCounter.isCounterReached(numLoops)) {
if (cause == null) return null;
throw cause;
}
throw new ServiceSpecificException(EBUSY);
}).when(mNetd).networkAddInterface(LOCAL_NET_ID, IFACE_NAME);
}
class Counter {
private int mValue = 0;
private void count() {
mValue++;
}
private boolean isCounterReached(int target) {
return mValue >= target;
}
}
private void verifyTetherInterfaceSucceeds(int expectedTries) throws Exception {
setNetworkAddInterfaceOutcome(null, expectedTries);
NetdUtils.tetherInterface(mNetd, IFACE_NAME, TEST_IPPREFIX);
verify(mNetd).tetherInterfaceAdd(IFACE_NAME);
verify(mNetd, times(expectedTries)).networkAddInterface(LOCAL_NET_ID, IFACE_NAME);
verify(mNetd, times(2)).networkAddRoute(eq(LOCAL_NET_ID), eq(IFACE_NAME), any(), any());
verifyNoMoreInteractions(mNetd);
reset(mNetd);
}
@Test
public void testTetherInterfaceSuccessful() throws Exception {
// Expect #networkAddInterface successful at first tries.
verifyTetherInterfaceSucceeds(1);
// Expect #networkAddInterface successful after 10 tries.
verifyTetherInterfaceSucceeds(10);
}
private void runTetherInterfaceWithServiceSpecificException(int expectedTries,
int expectedCode) throws Exception {
setNetworkAddInterfaceOutcome(new ServiceSpecificException(expectedCode), expectedTries);
try {
NetdUtils.tetherInterface(mNetd, IFACE_NAME, TEST_IPPREFIX, 20, 0);
fail("Expect throw ServiceSpecificException");
} catch (ServiceSpecificException e) {
assertEquals(e.errorCode, expectedCode);
}
verifyNetworkAddInterfaceFails(expectedTries);
reset(mNetd);
}
private void runTetherInterfaceWithRemoteException(int expectedTries) throws Exception {
setNetworkAddInterfaceOutcome(new RemoteException(), expectedTries);
try {
NetdUtils.tetherInterface(mNetd, IFACE_NAME, TEST_IPPREFIX, 20, 0);
fail("Expect throw RemoteException");
} catch (RemoteException e) { }
verifyNetworkAddInterfaceFails(expectedTries);
reset(mNetd);
}
private void verifyNetworkAddInterfaceFails(int expectedTries) throws Exception {
verify(mNetd).tetherInterfaceAdd(IFACE_NAME);
verify(mNetd, times(expectedTries)).networkAddInterface(LOCAL_NET_ID, IFACE_NAME);
verify(mNetd, never()).networkAddRoute(anyInt(), anyString(), any(), any());
verifyNoMoreInteractions(mNetd);
}
@Test
public void testTetherInterfaceFailOnNetworkAddInterface() throws Exception {
// Test throwing ServiceSpecificException with EBUSY failure.
runTetherInterfaceWithServiceSpecificException(20, EBUSY);
// Test throwing ServiceSpecificException with unexpectedError.
final int unexpectedError = 999;
runTetherInterfaceWithServiceSpecificException(1, unexpectedError);
// Test throwing ServiceSpecificException with unexpectedError after 7 tries.
runTetherInterfaceWithServiceSpecificException(7, unexpectedError);
// Test throwing RemoteException.
runTetherInterfaceWithRemoteException(1);
// Test throwing RemoteException after 3 tries.
runTetherInterfaceWithRemoteException(3);
}
}
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