Hugo Benichi | eab511b | 2016-09-09 09:23:47 +0900 | [diff] [blame] | 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 com.android.server.connectivity; |
| 18 | |
| 19 | import android.content.Context; |
| 20 | import android.net.ConnectivityMetricsEvent; |
| 21 | import android.net.IIpConnectivityMetrics; |
| 22 | import android.net.metrics.IpConnectivityLog; |
| 23 | import android.os.IBinder; |
| 24 | import android.os.Parcelable; |
| 25 | import android.text.TextUtils; |
| 26 | import android.util.Base64; |
| 27 | import android.util.Log; |
| 28 | import com.android.internal.annotations.GuardedBy; |
| 29 | import com.android.internal.annotations.VisibleForTesting; |
| 30 | import com.android.server.SystemService; |
| 31 | import java.io.FileDescriptor; |
| 32 | import java.io.IOException; |
| 33 | import java.io.PrintWriter; |
| 34 | import java.util.ArrayList; |
| 35 | |
| 36 | import static com.android.server.connectivity.metrics.IpConnectivityLogClass.IpConnectivityEvent; |
| 37 | |
| 38 | /** {@hide} */ |
| 39 | final public class IpConnectivityMetrics extends SystemService { |
| 40 | private static final String TAG = IpConnectivityMetrics.class.getSimpleName(); |
| 41 | private static final boolean DBG = false; |
| 42 | |
| 43 | private static final String SERVICE_NAME = IpConnectivityLog.SERVICE_NAME; |
| 44 | |
| 45 | // Default size of the event buffer. Once the buffer is full, incoming events are dropped. |
| 46 | private static final int DEFAULT_BUFFER_SIZE = 2000; |
| 47 | |
| 48 | // Lock ensuring that concurrent manipulations of the event buffer are correct. |
| 49 | // There are three concurrent operations to synchronize: |
| 50 | // - appending events to the buffer. |
| 51 | // - iterating throught the buffer. |
| 52 | // - flushing the buffer content and replacing it by a new buffer. |
| 53 | private final Object mLock = new Object(); |
| 54 | |
| 55 | @VisibleForTesting |
| 56 | public final Impl impl = new Impl(); |
Hugo Benichi | 00a42d4 | 2016-09-13 15:55:09 +0900 | [diff] [blame^] | 57 | private DnsEventListenerService mDnsListener; |
| 58 | |
Hugo Benichi | eab511b | 2016-09-09 09:23:47 +0900 | [diff] [blame] | 59 | @GuardedBy("mLock") |
| 60 | private ArrayList<ConnectivityMetricsEvent> mBuffer; |
| 61 | @GuardedBy("mLock") |
| 62 | private int mDropped; |
| 63 | @GuardedBy("mLock") |
| 64 | private int mCapacity; |
| 65 | |
| 66 | public IpConnectivityMetrics(Context ctx) { |
| 67 | super(ctx); |
| 68 | initBuffer(); |
| 69 | } |
| 70 | |
| 71 | @Override |
| 72 | public void onStart() { |
| 73 | if (DBG) Log.d(TAG, "onStart"); |
| 74 | } |
| 75 | |
| 76 | @Override |
| 77 | public void onBootPhase(int phase) { |
| 78 | if (phase == SystemService.PHASE_SYSTEM_SERVICES_READY) { |
| 79 | if (DBG) Log.d(TAG, "onBootPhase"); |
Hugo Benichi | 00a42d4 | 2016-09-13 15:55:09 +0900 | [diff] [blame^] | 80 | mDnsListener = new DnsEventListenerService(getContext()); |
Hugo Benichi | eab511b | 2016-09-09 09:23:47 +0900 | [diff] [blame] | 81 | |
| 82 | publishBinderService(SERVICE_NAME, impl); |
Hugo Benichi | 00a42d4 | 2016-09-13 15:55:09 +0900 | [diff] [blame^] | 83 | publishBinderService(mDnsListener.SERVICE_NAME, mDnsListener); |
Hugo Benichi | eab511b | 2016-09-09 09:23:47 +0900 | [diff] [blame] | 84 | } |
| 85 | } |
| 86 | |
| 87 | @VisibleForTesting |
| 88 | public int bufferCapacity() { |
| 89 | return DEFAULT_BUFFER_SIZE; // TODO: read from config |
| 90 | } |
| 91 | |
| 92 | private void initBuffer() { |
| 93 | synchronized (mLock) { |
| 94 | mDropped = 0; |
| 95 | mCapacity = bufferCapacity(); |
| 96 | mBuffer = new ArrayList<>(mCapacity); |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | private int append(ConnectivityMetricsEvent event) { |
| 101 | if (DBG) Log.d(TAG, "logEvent: " + event); |
| 102 | synchronized (mLock) { |
| 103 | final int left = mCapacity - mBuffer.size(); |
| 104 | if (event == null) { |
| 105 | return left; |
| 106 | } |
| 107 | if (left == 0) { |
| 108 | mDropped++; |
| 109 | return 0; |
| 110 | } |
| 111 | mBuffer.add(event); |
| 112 | return left - 1; |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | private String flushEncodedOutput() { |
| 117 | final ArrayList<ConnectivityMetricsEvent> events; |
| 118 | final int dropped; |
| 119 | synchronized (mLock) { |
| 120 | events = mBuffer; |
| 121 | dropped = mDropped; |
| 122 | initBuffer(); |
| 123 | } |
| 124 | |
| 125 | final byte[] data; |
| 126 | try { |
| 127 | data = IpConnectivityEventBuilder.serialize(dropped, events); |
| 128 | } catch (IOException e) { |
| 129 | Log.e(TAG, "could not serialize events", e); |
| 130 | return ""; |
| 131 | } |
| 132 | |
| 133 | return Base64.encodeToString(data, Base64.DEFAULT); |
| 134 | } |
| 135 | |
| 136 | /** |
| 137 | * Clears the event buffer and prints its content as a protobuf serialized byte array |
| 138 | * inside a base64 encoded string. |
| 139 | */ |
| 140 | private void cmdFlush(FileDescriptor fd, PrintWriter pw, String[] args) { |
| 141 | pw.print(flushEncodedOutput()); |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * Prints the content of the event buffer, either using the events ASCII representation |
| 146 | * or using protobuf text format. |
| 147 | */ |
| 148 | private void cmdList(FileDescriptor fd, PrintWriter pw, String[] args) { |
| 149 | final ArrayList<ConnectivityMetricsEvent> events; |
| 150 | synchronized (mLock) { |
| 151 | events = new ArrayList(mBuffer); |
| 152 | } |
| 153 | |
| 154 | if (args.length > 1 && args[1].equals("proto")) { |
| 155 | for (IpConnectivityEvent ev : IpConnectivityEventBuilder.toProto(events)) { |
| 156 | pw.print(ev.toString()); |
| 157 | } |
| 158 | return; |
| 159 | } |
| 160 | |
| 161 | for (ConnectivityMetricsEvent ev : events) { |
| 162 | pw.println(ev.toString()); |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | private void cmdStats(FileDescriptor fd, PrintWriter pw, String[] args) { |
| 167 | synchronized (mLock) { |
| 168 | pw.println("Buffered events: " + mBuffer.size()); |
| 169 | pw.println("Buffer capacity: " + mCapacity); |
| 170 | pw.println("Dropped events: " + mDropped); |
| 171 | } |
Hugo Benichi | 00a42d4 | 2016-09-13 15:55:09 +0900 | [diff] [blame^] | 172 | if (mDnsListener != null) { |
| 173 | mDnsListener.dump(pw); |
| 174 | } |
Hugo Benichi | eab511b | 2016-09-09 09:23:47 +0900 | [diff] [blame] | 175 | } |
| 176 | |
| 177 | private void cmdDefault(FileDescriptor fd, PrintWriter pw, String[] args) { |
| 178 | if (args.length == 0) { |
| 179 | pw.println("No command"); |
| 180 | return; |
| 181 | } |
| 182 | pw.println("Unknown command " + TextUtils.join(" ", args)); |
| 183 | } |
| 184 | |
| 185 | public final class Impl extends IIpConnectivityMetrics.Stub { |
| 186 | static final String CMD_FLUSH = "flush"; |
| 187 | static final String CMD_LIST = "list"; |
| 188 | static final String CMD_STATS = "stats"; |
| 189 | static final String CMD_DEFAULT = CMD_STATS; |
| 190 | |
| 191 | @Override |
| 192 | public int logEvent(ConnectivityMetricsEvent event) { |
| 193 | enforceConnectivityInternalPermission(); |
| 194 | return append(event); |
| 195 | } |
| 196 | |
| 197 | @Override |
| 198 | public void dump(FileDescriptor fd, PrintWriter pw, String[] args) { |
| 199 | enforceDumpPermission(); |
| 200 | if (DBG) Log.d(TAG, "dumpsys " + TextUtils.join(" ", args)); |
| 201 | final String cmd = (args.length > 0) ? args[0] : CMD_DEFAULT; |
| 202 | switch (cmd) { |
| 203 | case CMD_FLUSH: |
| 204 | cmdFlush(fd, pw, args); |
| 205 | return; |
| 206 | case CMD_LIST: |
| 207 | cmdList(fd, pw, args); |
| 208 | return; |
| 209 | case CMD_STATS: |
| 210 | cmdStats(fd, pw, args); |
| 211 | return; |
| 212 | default: |
| 213 | cmdDefault(fd, pw, args); |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | private void enforceConnectivityInternalPermission() { |
| 218 | enforcePermission(android.Manifest.permission.CONNECTIVITY_INTERNAL); |
| 219 | } |
| 220 | |
| 221 | private void enforceDumpPermission() { |
| 222 | enforcePermission(android.Manifest.permission.DUMP); |
| 223 | } |
| 224 | |
| 225 | private void enforcePermission(String what) { |
| 226 | getContext().enforceCallingOrSelfPermission(what, "IpConnectivityMetrics"); |
| 227 | } |
| 228 | }; |
| 229 | } |