1 /* 2 * Copyright (C) 2006 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 com.android.server.am; 18 19 import android.annotation.NonNull; 20 import android.annotation.Nullable; 21 import android.compat.annotation.ChangeId; 22 import android.content.IntentFilter; 23 import android.content.pm.ApplicationInfo; 24 import android.os.Binder; 25 import android.os.UserHandle; 26 import android.util.PrintWriterPrinter; 27 import android.util.Printer; 28 import android.util.proto.ProtoOutputStream; 29 30 import com.android.internal.annotations.VisibleForTesting; 31 import com.android.server.compat.PlatformCompat; 32 33 import dalvik.annotation.optimization.NeverCompile; 34 35 import java.io.PrintWriter; 36 37 public final class BroadcastFilter extends IntentFilter { 38 /** 39 * Limit priority values defined by non-system apps to 40 * ({@link IntentFilter#SYSTEM_LOW_PRIORITY}, {@link IntentFilter#SYSTEM_HIGH_PRIORITY}). 41 */ 42 @ChangeId 43 @VisibleForTesting 44 static final long RESTRICT_PRIORITY_VALUES = 371309185L; 45 46 // Back-pointer to the list this filter is in. 47 final ReceiverList receiverList; 48 final String packageName; 49 final String featureId; 50 final String receiverId; 51 final String requiredPermission; 52 final int owningUid; 53 final int owningUserId; 54 final boolean instantApp; 55 final boolean visibleToInstantApp; 56 public final boolean exported; 57 final int initialPriority; 58 BroadcastFilter(IntentFilter _filter, ReceiverList _receiverList, String _packageName, String _featureId, String _receiverId, String _requiredPermission, int _owningUid, int _userId, boolean _instantApp, boolean _visibleToInstantApp, boolean _exported, ApplicationInfo _applicationInfo, PlatformCompat platformCompat)59 BroadcastFilter(IntentFilter _filter, ReceiverList _receiverList, 60 String _packageName, String _featureId, String _receiverId, String _requiredPermission, 61 int _owningUid, int _userId, boolean _instantApp, boolean _visibleToInstantApp, 62 boolean _exported, ApplicationInfo _applicationInfo, PlatformCompat platformCompat) { 63 super(_filter); 64 receiverList = _receiverList; 65 packageName = _packageName; 66 featureId = _featureId; 67 receiverId = _receiverId; 68 requiredPermission = _requiredPermission; 69 owningUid = _owningUid; 70 owningUserId = _userId; 71 instantApp = _instantApp; 72 visibleToInstantApp = _visibleToInstantApp; 73 exported = _exported; 74 initialPriority = getPriority(); 75 setPriority(calculateAdjustedPriority(owningUid, initialPriority, 76 _applicationInfo, platformCompat)); 77 } 78 getReceiverClassName()79 public @Nullable String getReceiverClassName() { 80 if (receiverId != null) { 81 final int index = receiverId.lastIndexOf('@'); 82 if (index > 0) { 83 return receiverId.substring(0, index); 84 } 85 } 86 return null; 87 } 88 getApplicationInfo()89 public @NonNull ApplicationInfo getApplicationInfo() { 90 return receiverList.app.info; 91 } 92 93 @NeverCompile dumpDebug(ProtoOutputStream proto, long fieldId)94 public void dumpDebug(ProtoOutputStream proto, long fieldId) { 95 long token = proto.start(fieldId); 96 super.dumpDebug(proto, BroadcastFilterProto.INTENT_FILTER); 97 if (requiredPermission != null) { 98 proto.write(BroadcastFilterProto.REQUIRED_PERMISSION, requiredPermission); 99 } 100 proto.write(BroadcastFilterProto.HEX_HASH, Integer.toHexString(System.identityHashCode(this))); 101 proto.write(BroadcastFilterProto.OWNING_USER_ID, owningUserId); 102 proto.end(token); 103 } 104 105 @NeverCompile dump(PrintWriter pw, String prefix)106 public void dump(PrintWriter pw, String prefix) { 107 dumpInReceiverList(pw, new PrintWriterPrinter(pw), prefix); 108 receiverList.dumpLocal(pw, prefix); 109 } 110 111 @NeverCompile dumpBrief(PrintWriter pw, String prefix)112 public void dumpBrief(PrintWriter pw, String prefix) { 113 dumpBroadcastFilterState(pw, prefix); 114 } 115 116 @NeverCompile dumpInReceiverList(PrintWriter pw, Printer pr, String prefix)117 public void dumpInReceiverList(PrintWriter pw, Printer pr, String prefix) { 118 super.dump(pr, prefix); 119 dumpBroadcastFilterState(pw, prefix); 120 } 121 122 @NeverCompile dumpBroadcastFilterState(PrintWriter pw, String prefix)123 void dumpBroadcastFilterState(PrintWriter pw, String prefix) { 124 if (requiredPermission != null) { 125 pw.print(prefix); pw.print("requiredPermission="); pw.println(requiredPermission); 126 } 127 if (initialPriority != getPriority()) { 128 pw.print(prefix); pw.print("initialPriority="); pw.println(initialPriority); 129 } 130 } 131 132 @VisibleForTesting calculateAdjustedPriority(int owningUid, int priority, ApplicationInfo applicationInfo, PlatformCompat platformCompat)133 static int calculateAdjustedPriority(int owningUid, int priority, 134 ApplicationInfo applicationInfo, PlatformCompat platformCompat) { 135 if (!Flags.restrictPriorityValues()) { 136 return priority; 137 } 138 final long token = Binder.clearCallingIdentity(); 139 try { 140 if (!platformCompat.isChangeEnabledInternalNoLogging( 141 RESTRICT_PRIORITY_VALUES, applicationInfo)) { 142 return priority; 143 } 144 } finally { 145 Binder.restoreCallingIdentity(token); 146 } 147 if (!UserHandle.isCore(owningUid)) { 148 if (priority >= SYSTEM_HIGH_PRIORITY) { 149 return SYSTEM_HIGH_PRIORITY - 1; 150 } else if (priority <= SYSTEM_LOW_PRIORITY) { 151 return SYSTEM_LOW_PRIORITY + 1; 152 } 153 } 154 return priority; 155 } 156 toString()157 public String toString() { 158 StringBuilder sb = new StringBuilder(); 159 sb.append("BroadcastFilter{"); 160 sb.append(Integer.toHexString(System.identityHashCode(this))); 161 sb.append(' '); 162 sb.append(owningUid); 163 sb.append("/u"); 164 sb.append(owningUserId); 165 sb.append(' '); 166 sb.append(receiverList); 167 sb.append('}'); 168 return sb.toString(); 169 } 170 } 171