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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 com.android.server.wifi;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import android.os.Binder;
import androidx.test.filters.SmallTest;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
/**
* Unit tests for {@link com.android.server.wifi.BinderUtil}.
*/
@SmallTest
public class BinderUtilTest extends WifiBaseTest {
static final int FAKE_UID = 30000000;
private long mToken;
/**
* Sets up the test harness before running a test.
*/
@Before
public void setUp() {
mToken = Binder.clearCallingIdentity();
}
/**
* Cleans up the test harness after running a test.
*/
@After
public void cleanUp() {
Binder.restoreCallingIdentity(mToken);
}
/**
* Test using {@link BinderUtil.setUid} to set and restore the Binder uid.
*/
@Test
public void setUid() {
final int pid = Binder.getCallingPid();
final int uid = Binder.getCallingUid();
assertFalse(uid == FAKE_UID);
// Verify that setUid() can be used to fake the Binder uid without affecting the pid.
BinderUtil.setUid(FAKE_UID);
assertEquals(pid, Binder.getCallingPid());
assertEquals(FAKE_UID, Binder.getCallingUid());
// Verify that setUid() can be used to restore the original Binder uid without affecting the
// pid.
BinderUtil.setUid(uid);
assertEquals(pid, Binder.getCallingPid());
assertEquals(uid, Binder.getCallingUid());
}
/**
* Test using {@link BinderUtil.setUid} to set the Binder uid and
* {@link Binder.restoreCallingIdentity} to restore it.
*/
@Test
public void setUidAndRestoreCallingIdentity() {
final int pid = Binder.getCallingPid();
final int uid = Binder.getCallingUid();
assertFalse(uid == FAKE_UID);
// Verify that setUid() can be used to fake the Binder uid without affecting the pid.
BinderUtil.setUid(FAKE_UID);
assertEquals(pid, Binder.getCallingPid());
assertEquals(FAKE_UID, Binder.getCallingUid());
// Verify that the setUid() calls above did not break Binder.restoreCallingIdentity().
Binder.restoreCallingIdentity(mToken);
assertEquals(pid, Binder.getCallingPid());
assertEquals(uid, Binder.getCallingUid());
}
}
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