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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 java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.nio.BufferOverflowException;
import java.nio.ByteBuffer;
import java.util.Locale;
import se.leap.bitmaskclient.R;
/**
* 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;
public static final int MAGIC_BYTE = 0x55;
protected OutputStream mLogFile;
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 LogItem) {
// Ignore log messages if not yet initialized
if (mLogFile == null)
return;
writeLogItemToDisk((LogItem) msg.obj);
} else if (msg.what == TRIM_LOG_FILE) {
trimLogFile();
for (LogItem li : VpnStatus.getlogbuffer())
writeLogItemToDisk(li);
} else if (msg.what == FLUSH_TO_DISK) {
flushToDisk();
}
} catch (IOException | BufferOverflowException e) {
e.printStackTrace();
VpnStatus.logError("Error during log cache: " + msg.what);
VpnStatus.logException(e);
}
}
private void flushToDisk() throws IOException {
mLogFile.flush();
}
private void trimLogFile() {
try {
mLogFile.flush();
((FileOutputStream) mLogFile).getChannel().truncate(0);
} catch (IOException e) {
e.printStackTrace();
}
}
private void writeLogItemToDisk(LogItem li) throws IOException {
// We do not really care if the log cache breaks between Android upgrades,
// write binary format to disc
byte[] liBytes = li.getMarschaledBytes();
writeEscapedBytes(liBytes);
}
public void writeEscapedBytes(byte[] bytes) throws IOException {
int magic = 0;
for (byte b : bytes)
if (b == MAGIC_BYTE || b == MAGIC_BYTE + 1)
magic++;
byte eBytes[] = new byte[bytes.length + magic];
int i = 0;
for (byte b : bytes) {
if (b == MAGIC_BYTE || b == MAGIC_BYTE + 1) {
eBytes[i++] = MAGIC_BYTE + 1;
eBytes[i++] = (byte) (b - MAGIC_BYTE);
} else {
eBytes[i++] = b;
}
}
byte[] lenBytes = ByteBuffer.allocate(4).putInt(bytes.length).array();
synchronized (mLogFile) {
mLogFile.write(MAGIC_BYTE);
mLogFile.write(lenBytes);
mLogFile.write(eBytes);
}
}
private void openLogFile(File cacheDir) throws FileNotFoundException {
File logfile = new File(cacheDir, LOGFILE_NAME);
mLogFile = new FileOutputStream(logfile);
}
private void readLogCache(File cacheDir) {
try {
File logfile = new File(cacheDir, LOGFILE_NAME);
if (!logfile.exists() || !logfile.canRead())
return;
readCacheContents(new FileInputStream(logfile));
} catch (java.io.IOException | java.lang.RuntimeException e) {
VpnStatus.logError("Reading cached logfile failed");
VpnStatus.logException(e);
e.printStackTrace();
// ignore reading file error
} finally {
synchronized (VpnStatus.readFileLock) {
VpnStatus.readFileLog = true;
VpnStatus.readFileLock.notifyAll();
}
}
}
protected void readCacheContents(InputStream in) throws IOException {
BufferedInputStream logFile = new BufferedInputStream(in);
byte[] buf = new byte[16384];
int read = logFile.read(buf, 0, 5);
int itemsRead = 0;
readloop:
while (read >= 5) {
int skipped = 0;
while (buf[skipped] != MAGIC_BYTE) {
skipped++;
if (!(logFile.read(buf, skipped + 4, 1) == 1) || skipped + 10 > buf.length) {
VpnStatus.logDebug(String.format(Locale.US, "Skipped %d bytes and no a magic byte found", skipped));
break readloop;
}
}
if (skipped > 0)
VpnStatus.logDebug(String.format(Locale.US, "Skipped %d bytes before finding a magic byte", skipped));
int len = ByteBuffer.wrap(buf, skipped + 1, 4).asIntBuffer().get();
// Marshalled LogItem
int pos = 0;
byte buf2[] = new byte[buf.length];
while (pos < len) {
byte b = (byte) logFile.read();
if (b == MAGIC_BYTE) {
VpnStatus.logDebug(String.format(Locale.US, "Unexpected magic byte found at pos %d, abort current log item", pos));
read = logFile.read(buf, 1, 4) + 1;
continue readloop;
} else if (b == MAGIC_BYTE + 1) {
b = (byte) logFile.read();
if (b == 0)
b = MAGIC_BYTE;
else if (b == 1)
b = MAGIC_BYTE + 1;
else {
VpnStatus.logDebug(String.format(Locale.US, "Escaped byte not 0 or 1: %d", b));
read = logFile.read(buf, 1, 4) + 1;
continue readloop;
}
}
buf2[pos++] = b;
}
restoreLogItem(buf2, len);
//Next item
read = logFile.read(buf, 0, 5);
itemsRead++;
if (itemsRead > 2 * VpnStatus.MAXLOGENTRIES) {
VpnStatus.logError("Too many logentries read from cache, aborting.");
read = 0;
}
}
VpnStatus.logDebug(R.string.reread_log, itemsRead);
}
protected void restoreLogItem(byte[] buf, int len) throws UnsupportedEncodingException {
LogItem li = new LogItem(buf, len);
if (li.verify()) {
VpnStatus.newLogItem(li, true);
} else {
VpnStatus.logError(String.format(Locale.getDefault(),
"Could not read log item from file: %d: %s",
len, bytesToHex(buf, Math.max(len, 80))));
}
}
private final 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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