/*
* @(#)FingerServlet.java 1.3 96/08/19 David Connelly
*
* Copyright (c) 1996 Sun Microsystems, Inc. All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for NON-COMMERCIAL purposes and without
* fee is hereby granted provided that this copyright notice
* appears in all copies. Please refer to the file "copyright.html"
* for further important copyright and licensing information.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
* THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
*/
import java.servlet.*;
import java.io.*;
import java.net.*;
import java.util.*;
/**
* Finger servlet. This servlet uses the finger protocol to query
* information about users on specified hosts. The query string
* parameters user, hosts, and verbose
* can be used to specify the user and hosts to query. The parameter
* user is the user name, hosts is a comma-separated
* list of host names to query, and verbose if specified will
* cause verbose output to be generated. For example,
*
* http:/goa/finger.html?user=dac&hosts=eno,doppio&verbose=yes
*
* This URL will request full information about user 'dac' on both
* hosts 'eno' and 'doppio'.
*
* @version 1.3, 08/19/96
* @author David Connelly
*/
public
class FingerServlet extends Servlet {
/*
* Port number for finger daemon.
*/
static final int FINGER_PORT = 79;
/**
* Handles a single finger request from the client.
*/
public void service(ServletRequest req, ServletResponse res)
throws IOException
{
String user = req.getQueryParameter("user");
String hosts = req.getQueryParameter("hosts");
String verbose = req.getQueryParameter("verbose");
res.setContentType("text/html");
res.setHeader("Pragma", "no-cache");
res.writeHeaders();
PrintStream out = new PrintStream(res.getOutputStream());
out.println("");
out.println("Finger Servlet");
out.println("");
out.println("Finger results:
");
out.println("");
if (hosts == null) {
finger(out, user, null, "yes".equalsIgnoreCase(verbose)) ;
} else {
StringTokenizer st = new StringTokenizer(hosts, ",");
while (st.hasMoreTokens()) {
String host = st.nextToken();
out.println("[" + host + "]");
try {
finger(out, user, host, "yes".equalsIgnoreCase(verbose));
} catch (IOException e) {
out.println(e);
}
out.println();
}
}
out.println("");
out.println("");
}
/*
* Sends finger output for a user and host to the specified output
* stream.
*/
void finger(OutputStream out, String user, String host, boolean verbose)
throws IOException
{
// open connection to finger daemon
Socket s;
if (host == null) {
s = new Socket(InetAddress.getLocalHost(), FINGER_PORT);
} else {
s = new Socket(host, FINGER_PORT);
}
// send finger command
PrintStream ps = new PrintStream(s.getOutputStream());
if (verbose) {
ps.print("/W ");
}
if (user != null) {
ps.print(user);
}
ps.print("\r\n");
ps.flush();
// copy results to output stream
InputStream in = s.getInputStream();
byte[] buf = new byte[512];
int len;
while ((len = in.read(buf, 0, buf.length)) != -1) {
out.write(buf, 0, len);
}
s.close();
}
}