/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.logging.log4j.core.net;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.ObjectInputStream;
import java.io.OptionalDataException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.AbstractServer;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.config.Configuration;
import org.apache.logging.log4j.core.config.ConfigurationFactory;
import org.apache.logging.log4j.core.config.XMLConfiguration;
import org.apache.logging.log4j.core.config.XMLConfigurationFactory;
/**
* Listens for events over a socket connection.
*/
public class UDPSocketServer extends AbstractServer implements Runnable {
private final Logger logger;
private static final int MAX_PORT = 65534;
private volatile boolean isActive = true;
private final DatagramSocket server;
// max size so we only have to deal with one packet
private final int maxBufferSize = 1024 * 65 + 1024;
/**
* Constructor.
*
* @param port
* to listen on.
* @throws IOException
* If an error occurs.
*/
public UDPSocketServer(final int port) throws IOException {
this.server = new DatagramSocket(port);
this.logger = LogManager.getLogger(this.getClass().getName() + '.' + port);
}
/**
* Main startup for the server.
*
* @param args
* The command line arguments.
* @throws Exception
* if an error occurs.
*/
public static void main(final String[] args) throws Exception {
if (args.length < 1 || args.length > 2) {
System.err.println("Incorrect number of arguments");
printUsage();
return;
}
final int port = Integer.parseInt(args[0]);
if (port <= 0 || port >= MAX_PORT) {
System.err.println("Invalid port number");
printUsage();
return;
}
if (args.length == 2 && args[1].length() > 0) {
ConfigurationFactory.setConfigurationFactory(new ServerConfigurationFactory(args[1]));
}
final UDPSocketServer sserver = new UDPSocketServer(port);
final Thread server = new Thread(sserver);
server.start();
final BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
while (true) {
final String line = reader.readLine();
if (line == null || line.equalsIgnoreCase("Quit") || line.equalsIgnoreCase("Stop") || line.equalsIgnoreCase("Exit")) {
sserver.shutdown();
server.join();
break;
}
}
}
private static void printUsage() {
System.out.println("Usage: ServerSocket port configFilePath");
}
/**
* Shutdown the server.
*/
public void shutdown() {
this.isActive = false;
Thread.currentThread().interrupt();
}
/**
* Accept incoming events and processes them.
*/
@Override
public void run() {
while (isActive) {
try {
final byte[] buf = new byte[maxBufferSize];
final DatagramPacket packet = new DatagramPacket(buf, buf.length);
server.receive(packet);
final ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(packet.getData(), packet.getOffset(), packet.getLength()));
final LogEvent event = (LogEvent) ois.readObject();
if (event != null) {
log(event);
}
} catch (final OptionalDataException opt) {
logger.error("OptionalDataException eof=" + opt.eof + " length=" + opt.length, opt);
} catch (final ClassNotFoundException cnfe) {
logger.error("Unable to locate LogEvent class", cnfe);
} catch (final EOFException eofe) {
logger.info("EOF encountered");
} catch (final IOException ioe) {
logger.error("Exception encountered on accept. Ignoring. Stack Trace :", ioe);
}
}
}
/**
* Factory that creates a Configuration for the server.
*/
private static class ServerConfigurationFactory extends XMLConfigurationFactory {
private final String path;
public ServerConfigurationFactory(final String path) {
this.path = path;
}
@Override
public Configuration getConfiguration(final String name, final URI configLocation) {
if (path != null && path.length() > 0) {
File file = null;
ConfigurationSource source = null;
try {
file = new File(path);
final FileInputStream is = new FileInputStream(file);
source = new ConfigurationSource(is, file);
} catch (final FileNotFoundException ex) {
// Ignore this error
}
if (source == null) {
try {
final URL url = new URL(path);
source = new ConfigurationSource(url.openStream(), path);
} catch (final MalformedURLException mue) {
// Ignore this error
} catch (final IOException ioe) {
// Ignore this error
}
}
try {
if (source != null) {
return new XMLConfiguration(source);
}
} catch (final Exception ex) {
// Ignore this error.
}
System.err.println("Unable to process configuration at " + path + ", using default.");
}
return super.getConfiguration(name, configLocation);
}
}
}