62 lines
2.1 KiB
Java
62 lines
2.1 KiB
Java
/*
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* Copyright (c) 2002, 2004, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.net.InetAddress;
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import java.util.*;
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import javax.naming.*;
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import javax.naming.directory.*;
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/*
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* Tests if a canonical name (CNAME) record exists for a
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* specified host - throws exception if DNS isn't configured
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* or there isn't a CNAME record.
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*/
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public class CanonicalName {
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public static void main(String args[]) throws Exception {
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final Hashtable<String,String> env = new Hashtable<String,String>();
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env.put("java.naming.factory.initial",
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"com.sun.jndi.dns.DnsContextFactory");
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DirContext ctx = new InitialDirContext(env);
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String ids[] = { "CNAME" };
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Attributes attrs = ctx.getAttributes(args[0], ids);
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NamingEnumeration ne = attrs.getAll();
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if (!ne.hasMoreElements()) {
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throw new Exception("no CNAME record");
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}
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// print out the CNAME records
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while (ne.hasMoreElements()) {
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Attribute attr = (Attribute)ne.next();
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for (NamingEnumeration e = attr.getAll(); e.hasMoreElements();) {
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System.out.println(args[0] + " -> " + e.next());
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}
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}
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}
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}
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