1/* 2 * Copyright (C) 2016 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 com.android.server.wifi; 18 19import static org.junit.Assert.assertEquals; 20import static org.junit.Assert.assertFalse; 21 22import android.os.Binder; 23import android.test.suitebuilder.annotation.SmallTest; 24 25import org.junit.After; 26import org.junit.Before; 27import org.junit.Test; 28 29/** 30 * Unit tests for {@link com.android.server.wifi.BinderUtil}. 31 */ 32@SmallTest 33public class BinderUtilTest { 34 static final int FAKE_UID = 30000000; 35 36 private long mToken; 37 38 /** 39 * Sets up the test harness before running a test. 40 */ 41 @Before 42 public void setUp() { 43 mToken = Binder.clearCallingIdentity(); 44 } 45 46 /** 47 * Cleans up the test harness after running a test. 48 */ 49 @After 50 public void cleanUp() { 51 Binder.restoreCallingIdentity(mToken); 52 } 53 54 /** 55 * Test using {@link BinderUtil.setUid} to set and restore the Binder uid. 56 */ 57 @Test 58 public void setUid() { 59 final int pid = Binder.getCallingPid(); 60 final int uid = Binder.getCallingUid(); 61 assertFalse(uid == FAKE_UID); 62 63 // Verify that setUid() can be used to fake the Binder uid without affecting the pid. 64 BinderUtil.setUid(FAKE_UID); 65 assertEquals(pid, Binder.getCallingPid()); 66 assertEquals(FAKE_UID, Binder.getCallingUid()); 67 68 // Verify that setUid() can be used to restore the original Binder uid without affecting the 69 // pid. 70 BinderUtil.setUid(uid); 71 assertEquals(pid, Binder.getCallingPid()); 72 assertEquals(uid, Binder.getCallingUid()); 73 } 74 75 /** 76 * Test using {@link BinderUtil.setUid} to set the Binder uid and 77 * {@link Binder.restoreCallingIdentity} to restore it. 78 */ 79 @Test 80 public void setUidAndRestoreCallingIdentity() { 81 final int pid = Binder.getCallingPid(); 82 final int uid = Binder.getCallingUid(); 83 assertFalse(uid == FAKE_UID); 84 85 // Verify that setUid() can be used to fake the Binder uid without affecting the pid. 86 BinderUtil.setUid(FAKE_UID); 87 assertEquals(pid, Binder.getCallingPid()); 88 assertEquals(FAKE_UID, Binder.getCallingUid()); 89 90 // Verify that the setUid() calls above did not break Binder.restoreCallingIdentity(). 91 Binder.restoreCallingIdentity(mToken); 92 assertEquals(pid, Binder.getCallingPid()); 93 assertEquals(uid, Binder.getCallingUid()); 94 } 95} 96