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/*
* FingerConnection.java
* 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
*
* Linking this library statically or dynamically with other modules is
* making a combined work based on this library. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
*
* As a special exception, the copyright holders of this library give you
* permission to link this library with independent modules to produce an
* executable, regardless of the license terms of these independent
* modules, and to copy and distribute the resulting executable under
* terms of your choice, provided that you also meet, for each linked
* independent module, the terms and conditions of the license of that
* module. An independent module is a module which is not derived from
* or based on this library. If you modify this library, you may extend
* this exception to your version of the library, but you are not
* obliged to do so. If you do not wish to do so, delete this
* exception statement from your version.
*/
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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