org.xbill.DNS.spi

Class DNSJavaNameService

java.lang.Object

org.xbill.DNS.spi.DNSJavaNameService

All Implemented Interfaces:

java.lang.reflect.InvocationHandler

public class DNSJavaNameService
extends java.lang.Object
implements java.lang.reflect.InvocationHandler

This class implements a Name Service Provider, which Java can use (starting with version 1.4), to perform DNS resolutions instead of using the standard calls.

This Name Service Provider uses dnsjava.

To use this provider, you must set the following system property: sun.net.spi.nameservice.provider.1=dns,dnsjava

Author:

Brian Wellington, Paul Cowan (pwc21@yahoo.com)

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	DNSJavaNameService() Creates a DNSJavaNameService instance.

Method Summary

Modifier and Type	Method and Description
java.lang.String	getHostByAddr(byte[] addr) Performs a reverse DNS lookup.
java.lang.Object	invoke(java.lang.Object proxy, java.lang.reflect.Method method, java.lang.Object[] args)
java.net.InetAddress[]	lookupAllHostAddr(java.lang.String host) Performs a forward DNS lookup for the host name.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DNSJavaNameService

protected DNSJavaNameService()

Creates a DNSJavaNameService instance.

Uses the sun.net.spi.nameservice.nameservers, sun.net.spi.nameservice.domain, and java.net.preferIPv6Addresses properties for configuration.

Method Detail

invoke

public java.lang.Object invoke(java.lang.Object proxy,
                               java.lang.reflect.Method method,
                               java.lang.Object[] args)
                        throws java.lang.Throwable

Specified by:

invoke in interface java.lang.reflect.InvocationHandler

Throws:

java.lang.Throwable

lookupAllHostAddr

public java.net.InetAddress[] lookupAllHostAddr(java.lang.String host)
                                         throws java.net.UnknownHostException

Performs a forward DNS lookup for the host name.

Parameters:

host - The host name to resolve.

Returns:

All the ip addresses found for the host name.

Throws:

java.net.UnknownHostException

getHostByAddr

public java.lang.String getHostByAddr(byte[] addr)
                               throws java.net.UnknownHostException

Performs a reverse DNS lookup.

Parameters:

addr - The ip address to lookup.

Returns:

The host name found for the ip address.

Throws:

java.net.UnknownHostException