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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.loganalysis.parser;
import com.android.loganalysis.item.KernelLogItem;
import com.android.loganalysis.item.MiscKernelLogItem;
import com.android.loganalysis.item.SELinuxItem;
import com.android.loganalysis.util.LogPatternUtil;
import com.android.loganalysis.util.LogTailUtil;
import java.io.BufferedReader;
import java.io.IOException;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* A {@link IParser} to parse {@code /proc/last_kmsg} and the output from {@code dmsg}.
*/
public class KernelLogParser implements IParser {
public static final String KERNEL_RESET = "KERNEL_RESET";
public static final String KERNEL_ERROR = "KERNEL_ERROR";
public static final String SELINUX_DENIAL = "SELINUX_DENIAL";
/**
* Matches: [ 0.000000] Message<br />
* Matches: <3>[ 0.000000] Message
*/
private static final Pattern LOG_LINE = Pattern.compile(
"^(<\\d+>)?\\[\\s*(\\d+\\.\\d{6})\\] (.*)$");
private static final Pattern SELINUX_DENIAL_PATTERN = Pattern.compile(
".*avc:\\s.*scontext=\\w*:\\w*:([\\w\\s]*):\\w*\\s.*");
private KernelLogItem mKernelLog = null;
private Double mStartTime = null;
private Double mStopTime = null;
private LogPatternUtil mPatternUtil = new LogPatternUtil();
private LogTailUtil mPreambleUtil = new LogTailUtil(500, 50, 50);
public KernelLogParser() {
initPatterns();
}
/**
* Parse a kernel log from a {@link BufferedReader} into an {@link KernelLogItem} object.
*
* @return The {@link KernelLogItem}.
* @see #parse(List)
*/
public KernelLogItem parse(BufferedReader input) throws IOException {
String line;
while ((line = input.readLine()) != null) {
parseLine(line);
}
commit();
return mKernelLog;
}
/**
* {@inheritDoc}
*
* @return The {@link KernelLogItem}.
*/
@Override
public KernelLogItem parse(List<String> lines) {
for (String line : lines) {
parseLine(line);
}
commit();
return mKernelLog;
}
/**
* Parse a line of input.
*
* @param line The line to parse
*/
private void parseLine(String line) {
if ("".equals(line.trim())) {
return;
}
if (mKernelLog == null) {
mKernelLog = new KernelLogItem();
}
Matcher m = LOG_LINE.matcher(line);
if (m.matches()) {
Double time = Double.parseDouble(m.group(2));
String msg = m.group(3);
if (mStartTime == null) {
mStartTime = time;
}
mStopTime = time;
checkAndAddKernelEvent(msg);
mPreambleUtil.addLine(null, line);
} else {
checkAndAddKernelEvent(line);
}
}
/**
* Checks if a kernel log message matches a pattern and add a kernel event if it does.
*/
private void checkAndAddKernelEvent(String message) {
String category = mPatternUtil.checkMessage(message);
if (category == null) {
return;
}
MiscKernelLogItem kernelLogItem;
if (category.equals(SELINUX_DENIAL)) {
SELinuxItem selinuxItem = new SELinuxItem();
Matcher m = SELINUX_DENIAL_PATTERN.matcher(message);
if (m.matches()) {
selinuxItem.setSContext(m.group(1));
}
kernelLogItem = selinuxItem;
} else {
kernelLogItem = new MiscKernelLogItem();
}
kernelLogItem.setEventTime(mStopTime);
kernelLogItem.setPreamble(mPreambleUtil.getLastTail());
kernelLogItem.setStack(message);
kernelLogItem.setCategory(category);
mKernelLog.addEvent(kernelLogItem);
}
/**
* Signal that the input has finished.
*/
private void commit() {
if (mKernelLog == null) {
return;
}
mKernelLog.setStartTime(mStartTime);
mKernelLog.setStopTime(mStopTime);
}
private void initPatterns() {
// Kernel resets
// TODO: Separate out device specific patterns
final String[] kernelResets = {
"smem: DIAG.*",
"smsm: AMSS FATAL ERROR.*",
"kernel BUG at .*",
"PVR_K:\\(Fatal\\): Debug assertion failed! \\[.*\\]",
"Kernel panic.*",
"BP panicked",
"WROTE DSP RAMDUMP",
"tegra_wdt: last reset due to watchdog timeout.*",
"tegra_wdt tegra_wdt.0: last reset is due to watchdog timeout.*",
"Last reset was MPU Watchdog Timer reset.*",
"\\[MODEM_IF\\].*CRASH.*",
"Last boot reason: (?:kernel_panic|rpm_err|hw_reset(?:$|\n)|wdog_.*|" +
"tz_err|adsp_err|modem_err|mba_err|watchdogr?|Watchdog|Panic)",
"Last reset was system watchdog timer reset.*",
};
for (String pattern : kernelResets) {
mPatternUtil.addPattern(Pattern.compile(pattern), KERNEL_RESET);
}
mPatternUtil.addPattern(Pattern.compile("Internal error:.*"), KERNEL_ERROR);
// SELINUX denials
mPatternUtil.addPattern(SELINUX_DENIAL_PATTERN, SELINUX_DENIAL);
}
/**
* Get the internal {@link LogPatternUtil}. Exposed for unit testing.
*/
LogPatternUtil getLogPatternUtil() {
return mPatternUtil;
}
}
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