package com.ice.syslog;import java.io.*;import java.net.*;import java.util.Calendar;import java.util.Date;import java.util.Locale;import java.util.TimeZone;import java.text.SimpleDateFormat;/** * The Syslog class implements the UNIX syslog protocol allowing Java * to log messages to a specified UNIX host. Care has been taken to * preserve as much of the UNIX implementation as possible. * <br> * To use Syslog, simply create an instance, and use the Syslog() method * to log your message. The class provides all the expected syslog constants. * For example, LOG_ERR is Syslog.LOG_ERR. * <br> * Version: 1.2 - July 27, 1998<br> * Version: 1.0 - August 14, 1996<br> * HomePage: <a href="http://www.ice.com/java/syslog/index.shtml">Syslog.java</a> * * @author <a href="http://www.ice.com/~time/">Tim Endres</a><br> * @see DatagramSocket * @see	InetAddress */public class Syslog extends Object	{	// CLASS CONSTANTS	// CLASS VARIABLES		static private Syslog	logger = null;		// INSTANCE VARIABLES		private String			logName;	private String			hostName;	private int				portNum;	private int				flags;	private boolean			includeDate;	private InetAddress		boundAddress;	private DatagramSocket	socket;	private SimpleDateFormat	date1Format;	private SimpleDateFormat	date2Format;	// CLASS METHODS		/**	 * Binds the Syslog class to a specified host for further logging.	 * See the Syslog constructor for details on the parameters.	 */	static public void	open( String hostname, String name, int flags )		throws SyslogException		{		try {			Syslog.logger =				new Syslog					( hostname, SyslogDefs.DEFAULT_PORT, name, flags );			// Why do we provide this flag?			// Because catching exceptions from 'log()' would be			// too onerous for the programmer. By using this flag			// the programmer can catch any possible exceptions that			// might come up during logging, except for the syslog			// server going away during execution.			if ( (flags & SyslogDefs.LOG_START) != 0 )				{				Syslog.logger.syslog					( SyslogDefs.LOG_SYSLOG, SyslogDefs.LOG_INFO,						"syslog opened" );				}			}		catch ( SyslogException ex )			{			throw ex;			}		}		/**	 * Performs a syslog to the currently bound syslog host.	 */	static public void	log( int fac, int lvl, String msg )		{		try {			Syslog.logger.syslog( fac, lvl, msg );			}		catch ( SyslogException ex )			{			if ( (Syslog.logger.flags & SyslogDefs.LOG_PERROR) != 0 )				ex.printStackTrace( System.err );			}		}		/**	 * Unbinds the current syslog host.	 */	static public void	close()		{		logger = null;		}		/**	 * Creates a Syslog object instance, targeted for the UNIX host	 * with the hostname 'hostname' on the syslog port 'port'.	 * The only flags recognized are 'LOG_PERROR', which will log the	 * message to Java's 'System.err'.	 */	public	Syslog( String name, int flags )		throws SyslogException		{		super();				this.logName = name;		this.hostName = null;		this.portNum = SyslogDefs.DEFAULT_PORT;		this.flags = flags;		this.initialize();		}			/**	 * Creates a Syslog object instance, targeted for the UNIX host	 * with the hostname 'hostname' on the syslog port 'port'.	 * The only flags recognized are 'LOG_PERROR', which will log the	 * message to Java's 'System.err'.	 */	public	Syslog( String hostname, int port, String name, int flags )		throws SyslogException		{		super();				this.logName = name;		this.hostName = hostname;		this.portNum = port;		this.flags = flags;		try {			this.boundAddress = InetAddress.getByName( hostname );			}		catch ( UnknownHostException ex )			{			String message =				"error locating host named '" + hostname					+ "': " + ex.getMessage();						throw new SyslogException( message );			}		this.initialize();		}		private void	initialize()		throws SyslogException		{		try {			this.socket = new DatagramSocket();			}		catch ( SocketException ex )			{			String message =				"error creating syslog udp socket: "					+ ex.getMessage();			throw new SyslogException( message );			}		// This determines if the timestamp is added to the message		// in this, the client, or if it is left off for the server		// to fill in. Adding it in the client is the "standard" way,		// but most servers support the "old style" (no timestamp)		// messages as well. I leave this choice, since some servers		// may not work without it, and because some JDK's may not		// support SimpleDateFormat or TimeZone correctly.		this.includeDate = true;		if ( this.includeDate )			{			// We need two separate formatters here, since there is			// no way to get the single digit date (day of month) to			// pad with a space instead of a zero.			this.date1Format =				new SimpleDateFormat					( "MMM  d HH:mm:ss ", Locale.US );			this.date2Format =				new SimpleDateFormat					( "MMM dd HH:mm:ss ", Locale.US );			this.date1Format.setTimeZone				( TimeZone.getDefault() );			this.date2Format.setTimeZone				( TimeZone.getDefault() );			}		}	/**	 * Use this method to log your syslog messages. The facility and	 * level are the same as their UNIX counterparts, and the Syslog	 * class provides constants for these fields. The msg is what is	 * actually logged.	 */	public void	syslog( int fac, int pri, String msg )		throws SyslogException		{		this.syslog( this.boundAddress, this.portNum, fac, pri, msg );		}	/**	 * Use this method to log your syslog messages. The facility and	 * level are the same as their UNIX counterparts, and the Syslog	 * class provides constants for these fields. The msg is what is	 * actually logged.	 */	public void	syslog( InetAddress addr, int fac, int pri, String msg )		throws SyslogException		{		this.syslog( addr, this.portNum, fac, pri, msg );		}	/**	 * Use this method to log your syslog messages. The facility and	 * level are the same as their UNIX counterparts, and the Syslog	 * class provides constants for these fields. The msg is what is	 * actually logged.	 */	public void	syslog( String hostname, int fac, int pri, String msg )		throws SyslogException		{		try {			InetAddress address = InetAddress.getByName( hostname );			this.syslog( address, this.portNum, fac, pri, msg );			}		catch ( UnknownHostException ex )			{			String message =				"error locating host named '" + hostname					+ "': " + ex.getMessage();						throw new SyslogException( message );			}		}	/**	 * Use this method to log your syslog messages. The facility and	 * level are the same as their UNIX counterparts, and the Syslog	 * class provides constants for these fields. The msg is what is	 * actually logged.	 */	public void	syslog( String hostname, int port, int fac, int pri, String msg )		throws SyslogException		{		try {			InetAddress address = InetAddress.getByName( hostname );			this.syslog( address, port, fac, pri, msg );			}		catch ( UnknownHostException ex )			{			String message =				"error locating host named '" + hostname					+ "': " + ex.getMessage();						throw new SyslogException( message );			}		}	/**	 * Use this method to log your syslog messages. The facility and	 * level are the same as their UNIX counterparts, and the Syslog	 * class provides constants for these fields. The msg is what is	 * actually logged.	 */	public void	syslog( InetAddress addr, int port, int fac, int pri, String msg )		throws SyslogException		{		int				pricode;		int				length;		int				idx, sidx, nidx;		StringBuffer	buffer;		byte[]			data;		byte[]			sBytes;		byte[]			numbuf = new byte[32];		String			nmObj;		String			strObj;				pricode = SyslogDefs.computeCode( fac, pri );		Integer priObj = new Integer( pricode );				if ( this.logName != null )			{			nmObj = new String( this.logName );			}		else			{			nmObj = new String( Thread.currentThread().getName() );			}		length = 4 + nmObj.length() + msg.length() + 1;		length += (pricode > 99) ? 3 : ( (pricode > 9) ? 2 : 1 );		String dStr = null;		if ( this.includeDate )			{			// See note above on why we have two formats...			Calendar now = Calendar.getInstance();			if ( now.get( Calendar.DAY_OF_MONTH ) < 10 )				dStr = this.date1Format.format( now.getTime() );			else				dStr = this.date2Format.format( now.getTime() );			length += dStr.length();			}		data = new byte[length];				idx = 0;		data[idx++] = (byte)'<';				strObj = priObj.toString( priObj.intValue() );		sBytes = strObj.getBytes();		System.arraycopy			( sBytes, 0, data, idx, sBytes.length );		idx += sBytes.length;				data[idx++] = (byte)'>';		if ( this.includeDate )			{			sBytes = dStr.getBytes();			System.arraycopy				( sBytes, 0, data, idx, sBytes.length );			idx += sBytes.length;			}		sBytes = nmObj.getBytes();		System.arraycopy			( sBytes, 0, data, idx, sBytes.length );		idx += sBytes.length;				data[idx++] = (byte)':';		data[idx++] = (byte)' ';		sBytes = msg.getBytes();		System.arraycopy			( sBytes, 0, data, idx, sBytes.length );		idx += sBytes.length;				data[idx] = 0;		DatagramPacket packet =			new DatagramPacket( data, length, addr, port );				try {			socket.send( packet );			}		catch ( IOException ex )			{			String message =				"error sending message: '" + ex.getMessage() + "'";			System.err.println( message );			throw new SyslogException( message );			}		if ( (this.flags & SyslogDefs.LOG_PERROR) != 0 )			{			if ( this.logName != null )				{				System.err.print( this.logName + ": " );				}			else				{				System.err.print					( Thread.currentThread().getName() + ": " );				}			System.err.println( msg );			}		}	}