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 
17 package android.net;
18 
19 import static android.os.UserHandle.MIN_SECONDARY_USER_ID;
20 import static android.os.UserHandle.SYSTEM;
21 import static android.os.UserHandle.USER_SYSTEM;
22 import static android.os.UserHandle.getUid;
23 
24 import static org.junit.Assert.assertEquals;
25 import static org.junit.Assert.assertFalse;
26 import static org.junit.Assert.assertTrue;
27 import static org.junit.Assert.fail;
28 
29 import android.annotation.NonNull;
30 import android.annotation.Nullable;
31 import android.os.Build;
32 import android.os.UserHandle;
33 import android.util.ArraySet;
34 
35 import androidx.test.filters.SmallTest;
36 import androidx.test.runner.AndroidJUnit4;
37 
38 import com.android.testutils.ConnectivityModuleTest;
39 import com.android.testutils.DevSdkIgnoreRule;
40 import com.android.testutils.DevSdkIgnoreRule.IgnoreUpTo;
41 
42 import org.junit.Rule;
43 import org.junit.Test;
44 import org.junit.runner.RunWith;
45 
46 import java.util.Set;
47 
48 @RunWith(AndroidJUnit4.class)
49 @SmallTest
50 @ConnectivityModuleTest
51 public class UidRangeTest {
52 
53     /*
54      * UidRange is no longer passed to netd. UID ranges between the framework and netd are passed as
55      * UidRangeParcel objects.
56      */
57 
58     @Rule
59     public final DevSdkIgnoreRule mIgnoreRule = new DevSdkIgnoreRule();
60 
61     @Test
testSingleItemUidRangeAllowed()62     public void testSingleItemUidRangeAllowed() {
63         new UidRange(123, 123);
64         new UidRange(0, 0);
65         new UidRange(Integer.MAX_VALUE, Integer.MAX_VALUE);
66     }
67 
68     @Test
testNegativeUidsDisallowed()69     public void testNegativeUidsDisallowed() {
70         try {
71             new UidRange(-2, 100);
72             fail("Exception not thrown for negative start UID");
73         } catch (IllegalArgumentException expected) {
74         }
75 
76         try {
77             new UidRange(-200, -100);
78             fail("Exception not thrown for negative stop UID");
79         } catch (IllegalArgumentException expected) {
80         }
81     }
82 
83     @Test
testStopLessThanStartDisallowed()84     public void testStopLessThanStartDisallowed() {
85         final int x = 4195000;
86         try {
87             new UidRange(x, x - 1);
88             fail("Exception not thrown for negative-length UID range");
89         } catch (IllegalArgumentException expected) {
90         }
91     }
92 
93     @Test
testGetStartAndEndUser()94     public void testGetStartAndEndUser() throws Exception {
95         final UidRange uidRangeOfPrimaryUser = new UidRange(
96                 getUid(USER_SYSTEM, 10000), getUid(USER_SYSTEM, 10100));
97         final UidRange uidRangeOfSecondaryUser = new UidRange(
98                 getUid(MIN_SECONDARY_USER_ID, 10000), getUid(MIN_SECONDARY_USER_ID, 10100));
99         assertEquals(USER_SYSTEM, uidRangeOfPrimaryUser.getStartUser());
100         assertEquals(USER_SYSTEM, uidRangeOfPrimaryUser.getEndUser());
101         assertEquals(MIN_SECONDARY_USER_ID, uidRangeOfSecondaryUser.getStartUser());
102         assertEquals(MIN_SECONDARY_USER_ID, uidRangeOfSecondaryUser.getEndUser());
103 
104         final UidRange uidRangeForDifferentUsers = new UidRange(
105                 getUid(USER_SYSTEM, 10000), getUid(MIN_SECONDARY_USER_ID, 10100));
106         assertEquals(USER_SYSTEM, uidRangeOfPrimaryUser.getStartUser());
107         assertEquals(MIN_SECONDARY_USER_ID, uidRangeOfSecondaryUser.getEndUser());
108     }
109 
110     @Test @IgnoreUpTo(Build.VERSION_CODES.R)
testCreateForUser()111     public void testCreateForUser() throws Exception {
112         final UidRange uidRangeOfPrimaryUser = UidRange.createForUser(SYSTEM);
113         final UidRange uidRangeOfSecondaryUser = UidRange.createForUser(
114                 UserHandle.of(USER_SYSTEM + 1));
115         assertTrue(uidRangeOfPrimaryUser.stop < uidRangeOfSecondaryUser.start);
116         assertEquals(USER_SYSTEM, uidRangeOfPrimaryUser.getStartUser());
117         assertEquals(USER_SYSTEM, uidRangeOfPrimaryUser.getEndUser());
118         assertEquals(USER_SYSTEM + 1, uidRangeOfSecondaryUser.getStartUser());
119         assertEquals(USER_SYSTEM + 1, uidRangeOfSecondaryUser.getEndUser());
120     }
121 
122     private static void assertSameUids(@NonNull final String msg, @Nullable final Set<UidRange> s1,
123             @Nullable final Set<UidRange> s2) {
124         assertTrue(msg + " : " + s1 + " unexpectedly different from " + s2,
125                 UidRange.hasSameUids(s1, s2));
126     }
127 
128     private static void assertDifferentUids(@NonNull final String msg,
129             @Nullable final Set<UidRange> s1, @Nullable final Set<UidRange> s2) {
130         assertFalse(msg + " : " + s1 + " unexpectedly equal to " + s2,
131                 UidRange.hasSameUids(s1, s2));
132     }
133 
134     // R doesn't have UidRange.hasSameUids, but since S has the module, it does have hasSameUids.
135     @Test @IgnoreUpTo(Build.VERSION_CODES.R)
136     public void testHasSameUids() {
137         final UidRange uids1 = new UidRange(1, 100);
138         final UidRange uids2 = new UidRange(3, 300);
139         final UidRange uids3 = new UidRange(1, 1000);
140         final UidRange uids4 = new UidRange(800, 1000);
141 
142         assertSameUids("null <=> null", null, null);
143         final Set<UidRange> set1 = new ArraySet<>();
144         assertDifferentUids("empty <=> null", set1, null);
145         final Set<UidRange> set2 = new ArraySet<>();
146         set1.add(uids1);
147         assertDifferentUids("uids1 <=> null", set1, null);
148         assertDifferentUids("null <=> uids1", null, set1);
149         assertDifferentUids("uids1 <=> empty", set1, set2);
150         set2.add(uids1);
151         assertSameUids("uids1 <=> uids1", set1, set2);
152         set1.add(uids2);
153         assertDifferentUids("uids1,2 <=> uids1", set1, set2);
154         set1.add(uids3);
155         assertDifferentUids("uids1,2,3 <=> uids1", set1, set2);
156         set2.add(uids3);
157         assertDifferentUids("uids1,2,3 <=> uids1,3", set1, set2);
158         set2.add(uids2);
159         assertSameUids("uids1,2,3 <=> uids1,2,3", set1, set2);
160         set1.remove(uids2);
161         assertDifferentUids("uids1,3 <=> uids1,2,3", set1, set2);
162         set1.add(uids4);
163         assertDifferentUids("uids1,3,4 <=> uids1,2,3", set1, set2);
164         set2.add(uids4);
165         assertDifferentUids("uids1,3,4 <=> uids1,2,3,4", set1, set2);
166         assertDifferentUids("uids1,3,4 <=> null", set1, null);
167         set2.remove(uids2);
168         assertSameUids("uids1,3,4 <=> uids1,3,4", set1, set2);
169         set2.remove(uids1);
170         assertDifferentUids("uids1,3,4 <=> uids3,4", set1, set2);
171         set2.remove(uids3);
172         assertDifferentUids("uids1,3,4 <=> uids4", set1, set2);
173         set2.remove(uids4);
174         assertDifferentUids("uids1,3,4 <=> empty", set1, set2);
175         assertDifferentUids("null <=> empty", null, set2);
176         assertSameUids("empty <=> empty", set2, new ArraySet<>());
177     }
178 }
179