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1/*
2 * Copyright (C) 2009 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;
18
19import android.content.BroadcastReceiver;
20import android.content.Context;
21import android.content.Intent;
22import android.content.pm.IPackageManager;
23import android.os.Build;
24import android.os.DropBoxManager;
25import android.os.Environment;
26import android.os.FileObserver;
27import android.os.FileUtils;
28import android.os.RecoverySystem;
29import android.os.RemoteException;
30import android.os.ServiceManager;
31import android.os.SystemProperties;
32import android.os.storage.StorageManager;
33import android.provider.Downloads;
34import android.util.AtomicFile;
35import android.util.Slog;
36import android.util.Xml;
37
38import com.android.internal.util.FastXmlSerializer;
39import com.android.internal.util.XmlUtils;
40
41import java.io.File;
42import java.io.FileInputStream;
43import java.io.FileOutputStream;
44import java.io.IOException;
45import java.io.FileNotFoundException;
46import java.nio.charset.StandardCharsets;
47import java.util.HashMap;
48import java.util.Iterator;
49
50import org.xmlpull.v1.XmlPullParser;
51import org.xmlpull.v1.XmlPullParserException;
52import org.xmlpull.v1.XmlSerializer;
53
54/**
55 * Performs a number of miscellaneous, non-system-critical actions
56 * after the system has finished booting.
57 */
58public class BootReceiver extends BroadcastReceiver {
59    private static final String TAG = "BootReceiver";
60
61    // Maximum size of a logged event (files get truncated if they're longer).
62    // Give userdebug builds a larger max to capture extra debug, esp. for last_kmsg.
63    private static final int LOG_SIZE =
64        SystemProperties.getInt("ro.debuggable", 0) == 1 ? 98304 : 65536;
65
66    private static final File TOMBSTONE_DIR = new File("/data/tombstones");
67
68    // The pre-froyo package and class of the system updater, which
69    // ran in the system process.  We need to remove its packages here
70    // in order to clean up after a pre-froyo-to-froyo update.
71    private static final String OLD_UPDATER_PACKAGE =
72        "com.google.android.systemupdater";
73    private static final String OLD_UPDATER_CLASS =
74        "com.google.android.systemupdater.SystemUpdateReceiver";
75
76    // Keep a reference to the observer so the finalizer doesn't disable it.
77    private static FileObserver sTombstoneObserver = null;
78
79    private static final String LOG_FILES_FILE = "log-files.xml";
80    private static final AtomicFile sFile = new AtomicFile(new File(
81            Environment.getDataSystemDirectory(), LOG_FILES_FILE));
82
83    @Override
84    public void onReceive(final Context context, Intent intent) {
85        // Log boot events in the background to avoid blocking the main thread with I/O
86        new Thread() {
87            @Override
88            public void run() {
89                try {
90                    logBootEvents(context);
91                } catch (Exception e) {
92                    Slog.e(TAG, "Can't log boot events", e);
93                }
94                try {
95                    boolean onlyCore = false;
96                    try {
97                        onlyCore = IPackageManager.Stub.asInterface(ServiceManager.getService(
98                                "package")).isOnlyCoreApps();
99                    } catch (RemoteException e) {
100                    }
101                    if (!onlyCore) {
102                        removeOldUpdatePackages(context);
103                    }
104                } catch (Exception e) {
105                    Slog.e(TAG, "Can't remove old update packages", e);
106                }
107
108            }
109        }.start();
110    }
111
112    private void removeOldUpdatePackages(Context context) {
113        Downloads.removeAllDownloadsByPackage(context, OLD_UPDATER_PACKAGE, OLD_UPDATER_CLASS);
114    }
115
116    private void logBootEvents(Context ctx) throws IOException {
117        final DropBoxManager db = (DropBoxManager) ctx.getSystemService(Context.DROPBOX_SERVICE);
118        final String headers = new StringBuilder(512)
119            .append("Build: ").append(Build.FINGERPRINT).append("\n")
120            .append("Hardware: ").append(Build.BOARD).append("\n")
121            .append("Revision: ")
122            .append(SystemProperties.get("ro.revision", "")).append("\n")
123            .append("Bootloader: ").append(Build.BOOTLOADER).append("\n")
124            .append("Radio: ").append(Build.RADIO).append("\n")
125            .append("Kernel: ")
126            .append(FileUtils.readTextFile(new File("/proc/version"), 1024, "...\n"))
127            .append("\n").toString();
128        final String bootReason = SystemProperties.get("ro.boot.bootreason", null);
129
130        String recovery = RecoverySystem.handleAftermath(ctx);
131        if (recovery != null && db != null) {
132            db.addText("SYSTEM_RECOVERY_LOG", headers + recovery);
133        }
134
135        String lastKmsgFooter = "";
136        if (bootReason != null) {
137            lastKmsgFooter = new StringBuilder(512)
138                .append("\n")
139                .append("Boot info:\n")
140                .append("Last boot reason: ").append(bootReason).append("\n")
141                .toString();
142        }
143
144        HashMap<String, Long> timestamps = readTimestamps();
145
146        if (SystemProperties.getLong("ro.runtime.firstboot", 0) == 0) {
147            if (StorageManager.inCryptKeeperBounce()) {
148                // Encrypted, first boot to get PIN/pattern/password so data is tmpfs
149                // Don't set ro.runtime.firstboot so that we will do this again
150                // when data is properly mounted
151            } else {
152                String now = Long.toString(System.currentTimeMillis());
153                SystemProperties.set("ro.runtime.firstboot", now);
154            }
155            if (db != null) db.addText("SYSTEM_BOOT", headers);
156
157            // Negative sizes mean to take the *tail* of the file (see FileUtils.readTextFile())
158            addFileWithFootersToDropBox(db, timestamps, headers, lastKmsgFooter,
159                    "/proc/last_kmsg", -LOG_SIZE, "SYSTEM_LAST_KMSG");
160            addFileWithFootersToDropBox(db, timestamps, headers, lastKmsgFooter,
161                    "/sys/fs/pstore/console-ramoops", -LOG_SIZE, "SYSTEM_LAST_KMSG");
162            addFileToDropBox(db, timestamps, headers, "/cache/recovery/log", -LOG_SIZE,
163                    "SYSTEM_RECOVERY_LOG");
164            addFileToDropBox(db, timestamps, headers, "/cache/recovery/last_kmsg",
165                    -LOG_SIZE, "SYSTEM_RECOVERY_KMSG");
166            addAuditErrorsToDropBox(db, timestamps, headers, -LOG_SIZE, "SYSTEM_AUDIT");
167            addFsckErrorsToDropBox(db, timestamps, headers, -LOG_SIZE, "SYSTEM_FSCK");
168        } else {
169            if (db != null) db.addText("SYSTEM_RESTART", headers);
170        }
171
172        // Scan existing tombstones (in case any new ones appeared)
173        File[] tombstoneFiles = TOMBSTONE_DIR.listFiles();
174        for (int i = 0; tombstoneFiles != null && i < tombstoneFiles.length; i++) {
175            if (tombstoneFiles[i].isFile()) {
176                addFileToDropBox(db, timestamps, headers, tombstoneFiles[i].getPath(),
177                        LOG_SIZE, "SYSTEM_TOMBSTONE");
178            }
179        }
180
181        writeTimestamps(timestamps);
182
183        // Start watching for new tombstone files; will record them as they occur.
184        // This gets registered with the singleton file observer thread.
185        sTombstoneObserver = new FileObserver(TOMBSTONE_DIR.getPath(), FileObserver.CLOSE_WRITE) {
186            @Override
187            public void onEvent(int event, String path) {
188                HashMap<String, Long> timestamps = readTimestamps();
189                try {
190                    File file = new File(TOMBSTONE_DIR, path);
191                    if (file.isFile()) {
192                        addFileToDropBox(db, timestamps, headers, file.getPath(), LOG_SIZE,
193                                "SYSTEM_TOMBSTONE");
194                    }
195                } catch (IOException e) {
196                    Slog.e(TAG, "Can't log tombstone", e);
197                }
198                writeTimestamps(timestamps);
199            }
200        };
201
202        sTombstoneObserver.startWatching();
203    }
204
205    private static void addFileToDropBox(
206            DropBoxManager db, HashMap<String, Long> timestamps,
207            String headers, String filename, int maxSize, String tag) throws IOException {
208        addFileWithFootersToDropBox(db, timestamps, headers, "", filename, maxSize, tag);
209    }
210
211    private static void addFileWithFootersToDropBox(
212            DropBoxManager db, HashMap<String, Long> timestamps,
213            String headers, String footers, String filename, int maxSize,
214            String tag) throws IOException {
215        if (db == null || !db.isTagEnabled(tag)) return;  // Logging disabled
216
217        File file = new File(filename);
218        long fileTime = file.lastModified();
219        if (fileTime <= 0) return;  // File does not exist
220
221        if (timestamps.containsKey(filename) && timestamps.get(filename) == fileTime) {
222            return;  // Already logged this particular file
223        }
224
225        timestamps.put(filename, fileTime);
226
227        Slog.i(TAG, "Copying " + filename + " to DropBox (" + tag + ")");
228        db.addText(tag, headers + FileUtils.readTextFile(file, maxSize, "[[TRUNCATED]]\n") +
229                footers);
230    }
231
232    private static void addAuditErrorsToDropBox(DropBoxManager db,
233            HashMap<String, Long> timestamps, String headers, int maxSize, String tag)
234            throws IOException {
235        if (db == null || !db.isTagEnabled(tag)) return;  // Logging disabled
236        Slog.i(TAG, "Copying audit failures to DropBox");
237
238        File file = new File("/proc/last_kmsg");
239        long fileTime = file.lastModified();
240        if (fileTime <= 0) {
241            file = new File("/sys/fs/pstore/console-ramoops");
242            fileTime = file.lastModified();
243        }
244
245        if (fileTime <= 0) return;  // File does not exist
246
247        if (timestamps.containsKey(tag) && timestamps.get(tag) == fileTime) {
248            return;  // Already logged this particular file
249        }
250
251        timestamps.put(tag, fileTime);
252
253        String log = FileUtils.readTextFile(file, maxSize, "[[TRUNCATED]]\n");
254        StringBuilder sb = new StringBuilder();
255        for (String line : log.split("\n")) {
256            if (line.contains("audit")) {
257                sb.append(line + "\n");
258            }
259        }
260        Slog.i(TAG, "Copied " + sb.toString().length() + " worth of audits to DropBox");
261        db.addText(tag, headers + sb.toString());
262    }
263
264    private static void addFsckErrorsToDropBox(DropBoxManager db,
265            HashMap<String, Long> timestamps, String headers, int maxSize, String tag)
266            throws IOException {
267        boolean upload_needed = false;
268        if (db == null || !db.isTagEnabled(tag)) return;  // Logging disabled
269        Slog.i(TAG, "Checking for fsck errors");
270
271        File file = new File("/dev/fscklogs/log");
272        long fileTime = file.lastModified();
273        if (fileTime <= 0) return;  // File does not exist
274
275        String log = FileUtils.readTextFile(file, maxSize, "[[TRUNCATED]]\n");
276        StringBuilder sb = new StringBuilder();
277        for (String line : log.split("\n")) {
278            if (line.contains("FILE SYSTEM WAS MODIFIED")) {
279                upload_needed = true;
280                break;
281            }
282        }
283
284        if (upload_needed) {
285            addFileToDropBox(db, timestamps, headers, "/dev/fscklogs/log", maxSize, tag);
286        }
287
288        // Remove the file so we don't re-upload if the runtime restarts.
289        file.delete();
290    }
291
292    private static HashMap<String, Long> readTimestamps() {
293        synchronized (sFile) {
294            HashMap<String, Long> timestamps = new HashMap<String, Long>();
295            boolean success = false;
296            try (final FileInputStream stream = sFile.openRead()) {
297                XmlPullParser parser = Xml.newPullParser();
298                parser.setInput(stream, StandardCharsets.UTF_8.name());
299
300                int type;
301                while ((type = parser.next()) != XmlPullParser.START_TAG
302                        && type != XmlPullParser.END_DOCUMENT) {
303                    ;
304                }
305
306                if (type != XmlPullParser.START_TAG) {
307                    throw new IllegalStateException("no start tag found");
308                }
309
310                int outerDepth = parser.getDepth();  // Skip the outer <log-files> tag.
311                while ((type = parser.next()) != XmlPullParser.END_DOCUMENT
312                        && (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) {
313                    if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) {
314                        continue;
315                    }
316
317                    String tagName = parser.getName();
318                    if (tagName.equals("log")) {
319                        final String filename = parser.getAttributeValue(null, "filename");
320                        final long timestamp = Long.valueOf(parser.getAttributeValue(
321                                    null, "timestamp"));
322                        timestamps.put(filename, timestamp);
323                    } else {
324                        Slog.w(TAG, "Unknown tag: " + parser.getName());
325                        XmlUtils.skipCurrentTag(parser);
326                    }
327                }
328                success = true;
329            } catch (FileNotFoundException e) {
330                Slog.i(TAG, "No existing last log timestamp file " + sFile.getBaseFile() +
331                        "; starting empty");
332            } catch (IOException e) {
333                Slog.w(TAG, "Failed parsing " + e);
334            } catch (IllegalStateException e) {
335                Slog.w(TAG, "Failed parsing " + e);
336            } catch (NullPointerException e) {
337                Slog.w(TAG, "Failed parsing " + e);
338            } catch (XmlPullParserException e) {
339                Slog.w(TAG, "Failed parsing " + e);
340            } finally {
341                if (!success) {
342                    timestamps.clear();
343                }
344            }
345            return timestamps;
346        }
347    }
348
349    private void writeTimestamps(HashMap<String, Long> timestamps) {
350        synchronized (sFile) {
351            final FileOutputStream stream;
352            try {
353                stream = sFile.startWrite();
354            } catch (IOException e) {
355                Slog.w(TAG, "Failed to write timestamp file: " + e);
356                return;
357            }
358
359            try {
360                XmlSerializer out = new FastXmlSerializer();
361                out.setOutput(stream, StandardCharsets.UTF_8.name());
362                out.startDocument(null, true);
363                out.startTag(null, "log-files");
364
365                Iterator<String> itor = timestamps.keySet().iterator();
366                while (itor.hasNext()) {
367                    String filename = itor.next();
368                    out.startTag(null, "log");
369                    out.attribute(null, "filename", filename);
370                    out.attribute(null, "timestamp", timestamps.get(filename).toString());
371                    out.endTag(null, "log");
372                }
373
374                out.endTag(null, "log-files");
375                out.endDocument();
376
377                sFile.finishWrite(stream);
378            } catch (IOException e) {
379                Slog.w(TAG, "Failed to write timestamp file, using the backup: " + e);
380                sFile.failWrite(stream);
381            }
382        }
383    }
384}
385