| /* |
| * Copyright (c) 2002, 2004, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| import java.net.InetAddress; |
| import java.util.*; |
| import javax.naming.*; |
| import javax.naming.directory.*; |
| |
| /* |
| * Tests if a canonical name (CNAME) record exists for a |
| * specified host - throws exception if DNS isn't configured |
| * or there isn't a CNAME record. |
| */ |
| |
| public class CanonicalName { |
| |
| public static void main(String args[]) throws Exception { |
| final Hashtable<String,String> env = new Hashtable<String,String>(); |
| env.put("java.naming.factory.initial", |
| "com.sun.jndi.dns.DnsContextFactory"); |
| DirContext ctx = new InitialDirContext(env); |
| |
| String ids[] = { "CNAME" }; |
| Attributes attrs = ctx.getAttributes(args[0], ids); |
| |
| NamingEnumeration ne = attrs.getAll(); |
| if (!ne.hasMoreElements()) { |
| throw new Exception("no CNAME record"); |
| } |
| |
| // print out the CNAME records |
| |
| while (ne.hasMoreElements()) { |
| Attribute attr = (Attribute)ne.next(); |
| for (NamingEnumeration e = attr.getAll(); e.hasMoreElements();) { |
| System.out.println(args[0] + " -> " + e.next()); |
| } |
| } |
| |
| } |
| } |