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/*
* Copyright (c) 2012-2015 Arne Schwabe
* Distributed under the GNU GPL v2 with additional terms. For full terms see the file doc/LICENSE.txt
*/
package de.blinkt.openvpn.core;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.os.Parcel;
import android.text.TextUtils;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Locale;
import de.blinkt.openvpn.R;
import de.blinkt.openvpn.fragments.Utils;
/**
* Created by arne on 23.01.16.
*/
class LogFileHandler extends Handler {
static final int TRIM_LOG_FILE = 100;
static final int FLUSH_TO_DISK = 101;
static final int LOG_INIT = 102;
public static final int LOG_MESSAGE = 103;
private static FileOutputStream mLogFile;
private static BufferedOutputStream mBufLogfile;
public static final String LOGFILE_NAME = "logcache.dat";
public LogFileHandler(Looper looper) {
super(looper);
}
@Override
public void handleMessage(Message msg) {
try {
if (msg.what == LOG_INIT) {
if (mLogFile != null)
throw new RuntimeException("mLogFile not null");
readLogCache((File) msg.obj);
openLogFile((File) msg.obj);
} else if (msg.what == LOG_MESSAGE && msg.obj instanceof VpnStatus.LogItem) {
// Ignore log messages if not yet initialized
if (mLogFile == null)
return;
writeLogItemToDisk((VpnStatus.LogItem) msg.obj);
} else if (msg.what == TRIM_LOG_FILE) {
trimLogFile();
for (VpnStatus.LogItem li : VpnStatus.getlogbuffer())
writeLogItemToDisk(li);
} else if (msg.what == FLUSH_TO_DISK) {
flushToDisk();
}
} catch (IOException e) {
e.printStackTrace();
VpnStatus.logError("Error during log cache: " + msg.what);
VpnStatus.logException(e);
}
}
private void flushToDisk() throws IOException {
mLogFile.flush();
}
private static void trimLogFile() {
try {
mBufLogfile.flush();
mLogFile.getChannel().truncate(0);
} catch (IOException e) {
e.printStackTrace();
}
}
private void writeLogItemToDisk(VpnStatus.LogItem li) throws IOException {
Parcel p = Parcel.obtain();
li.writeToParcel(p, 0);
// We do not really care if the log cache breaks between Android upgrades,
// write binary format to disc
byte[] liBytes = p.marshall();
byte[] lenBytes = ByteBuffer.allocate(4).putInt(liBytes.length).array();
mLogFile.write(lenBytes);
mLogFile.write(liBytes);
p.recycle();
}
private void openLogFile (File cacheDir) throws FileNotFoundException {
File logfile = new File(cacheDir, LOGFILE_NAME);
mLogFile = new FileOutputStream(logfile);
mBufLogfile = new BufferedOutputStream(mLogFile);
}
private void readLogCache(File cacheDir) {
File logfile = new File(cacheDir, LOGFILE_NAME);
if (!logfile.exists() || !logfile.canRead())
return;
try {
BufferedInputStream logFile = new BufferedInputStream(new FileInputStream(logfile));
byte[] buf = new byte[8192];
int read = logFile.read(buf, 0, 4);
int itemsRead=0;
while (read >= 4) {
int len = ByteBuffer.wrap(buf, 0, 4).asIntBuffer().get();
// Marshalled LogItem
read = logFile.read(buf, 0, len);
Parcel p = Parcel.obtain();
p.unmarshall(buf, 0, read);
p.setDataPosition(0);
VpnStatus.LogItem li = VpnStatus.LogItem.CREATOR.createFromParcel(p);
if (li.verify()) {
VpnStatus.newLogItem(li, true);
} else {
VpnStatus.logError(String.format(Locale.getDefault(),
"Could not read log item from file: %d/%d: %s",
read, len, bytesToHex(buf, Math.max(read,80))));
}
p.recycle();
//Next item
read = logFile.read(buf, 0, 4);
itemsRead++;
if (itemsRead > 2*VpnStatus.MAXLOGENTRIES) {
VpnStatus.logError("Too many logentries read from cache, aborting.");
read = 0;
}
}
VpnStatus.logDebug(R.string.reread_log, itemsRead);
} catch (java.io.IOException | java.lang.RuntimeException e) {
VpnStatus.logError("Reading cached logfile failed");
VpnStatus.logException(e);
e.printStackTrace();
// ignore reading file error
}
}
final protected static char[] hexArray = "0123456789ABCDEF".toCharArray();
public static String bytesToHex(byte[] bytes, int len) {
len = Math.min(bytes.length, len);
char[] hexChars = new char[len * 2];
for ( int j = 0; j < len; j++ ) {
int v = bytes[j] & 0xFF;
hexChars[j * 2] = hexArray[v >>> 4];
hexChars[j * 2 + 1] = hexArray[v & 0x0F];
}
return new String(hexChars);
}
}
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