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Syslog4j provides client and server implementations of the BSD Syslog protocol (RFC 3164) and the structured syslog" protocol (RFC5424).

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/**
 *
 * (C) Copyright 2008-2011 syslog4j.org
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser General Public License
 * (LGPL) version 2.1 which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/lgpl-2.1.html
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 */
package com.nesscomputing.syslog4j.server.impl.net.udp;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;

import org.apache.log4j.Logger;

import com.nesscomputing.syslog4j.SyslogConstants;
import com.nesscomputing.syslog4j.SyslogRuntimeException;
import com.nesscomputing.syslog4j.server.SyslogServerEventIF;
import com.nesscomputing.syslog4j.server.impl.AbstractSyslogServer;
import com.nesscomputing.syslog4j.util.SyslogUtility;

/**
* UDPNetSyslogServer provides a simple non-threaded UDP/IP server implementation.
*
* 

Syslog4j is licensed under the Lesser GNU Public License v2.1. A copy * of the LGPL license is available in the META-INF folder in all * distributions of Syslog4j and in the base directory of the "doc" ZIP.

* * @author <[email protected]> * @version $Id: UDPNetSyslogServer.java,v 1.16 2010/11/12 03:43:15 cvs Exp $ */ public class UDPNetSyslogServer extends AbstractSyslogServer { private static final Logger LOG = Logger.getLogger(UDPNetSyslogServer.class); protected DatagramSocket ds = null; public void initialize() throws SyslogRuntimeException { // } public void shutdown() { super.shutdown(); if (this.syslogServerConfig.getShutdownWait() > 0) { SyslogUtility.sleep(this.syslogServerConfig.getShutdownWait()); } if (this.ds != null && !this.ds.isClosed()) { this.ds.close(); } } protected DatagramSocket createDatagramSocket() throws SocketException, UnknownHostException { DatagramSocket datagramSocket = null; if (this.syslogServerConfig.getHost() != null) { InetAddress inetAddress = InetAddress.getByName(this.syslogServerConfig.getHost()); datagramSocket = new DatagramSocket(this.syslogServerConfig.getPort(),inetAddress); } else { datagramSocket = new DatagramSocket(this.syslogServerConfig.getPort()); } return datagramSocket; } public void run() { try { this.ds = createDatagramSocket(); this.shutdown = false; } catch (SocketException se) { LOG.warn("While creating datagram socket", se); return; } catch (UnknownHostException uhe) { LOG.warn("While creating datagram socket", uhe); return; } byte[] receiveData = new byte[SyslogConstants.SYSLOG_BUFFER_SIZE]; handleInitialize(this); while(!this.shutdown) { DatagramPacket dp = null; try { dp = new DatagramPacket(receiveData,receiveData.length); this.ds.receive(dp); SyslogServerEventIF event = createEvent(this.getConfig(),receiveData,dp.getLength(),dp.getAddress()); handleEvent(null,this,dp,event); } catch (SocketException se) { int i = se.getMessage() == null ? -1 : se.getMessage().toLowerCase().indexOf("socket closed"); if (i == -1) { handleException(null,this,dp.getSocketAddress(),se); } } catch (IOException ioe) { handleException(null,this,dp.getSocketAddress(),ioe); } } handleDestroy(this); } }




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