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/*
* $Id: FingerConnection.java,v 1.1 2004/06/07 20:12:50 dog Exp $
* Copyright (C) 2003 The Free Software Foundation
*
* This file is part of GNU inetlib, a library.
*
* GNU inetlib is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GNU inetlib 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* As a special exception, if you link this library with other files to
* produce an executable, this library does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* This exception does not however invalidate any other reasons why the
* executable file might be covered by the GNU General Public License.
*/
package gnu.inet.finger;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;
/**
* A client for the finger protocol described in RFC 1288.
*
* @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
*/
public class FingerConnection
{
/**
* The default finger port.
*/
public static final int DEFAULT_PORT = 79;
/*
* The US-ASCII encoding.
*/
private static final String US_ASCII = "US-ASCII";
/**
* The underlying socket used for communications.
*/
protected Socket socket;
/**
* If we want a verbose response.
*/
protected boolean verbose;
/**
* Creates a new finger connection.
* @param host the name of the internet host to connect to
*/
public FingerConnection (String host)
throws IOException
{
this (host, DEFAULT_PORT);
}
/**
* Creates a new finger connection.
* @param host the name of the internet host to connect to
* @param port the port to connect to
*/
public FingerConnection (String host, int port)
throws IOException
{
socket = new Socket (host, port);
}
/**
* Retrieves the verbose flag.
* If true, the server should provide more output.
*/
public boolean isVerbose ()
{
return verbose;
}
/**
* Sets the verbose flag.
* If true, the server should provide more output.
* @param verbose true for more verbose, false otherwise
*/
public void setVerbose (boolean verbose)
{
this.verbose = verbose;
}
/**
* Lists the available users.
*/
public String list ()
throws IOException
{
return finger (null, null);
}
/**
* Fingers the specified user.
* @param username the user to finger
* @return information about all matching users
*/
public String finger (String username)
throws IOException
{
return finger (username, null);
}
/**
* Fingers the specified user at the specified host.
* @param username the user to finger (null for any user)
* @param hostname the domain of the user (null for any domain)
* @return information about all matching users
*/
public String finger (String username, String hostname)
throws IOException
{
// Send the command
OutputStream out = socket.getOutputStream ();
out = new BufferedOutputStream (out);
if (verbose)
{
out.write ('/');
out.write ('W');
if (username != null || hostname != null)
{
out.write (' ');
}
}
if (username != null)
{
out.write (username.getBytes (US_ASCII));
}
if (hostname != null)
{
out.write ('@');
out.write (hostname.getBytes (US_ASCII));
}
out.write ('\r');
out.write ('\n');
out.flush ();
// Read the response
InputStream in = socket.getInputStream ();
ByteArrayOutputStream acc = new ByteArrayOutputStream ();
byte[] buf = new byte[4096];
for (int len = in.read (buf); len != -1; len = in.read (buf))
{
acc.write (buf, 0, len);
}
return acc.toString (US_ASCII);
}
}
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