Package org.xbill.DNS.spi

Class DNSJavaNameService

java.lang.Object

org.xbill.DNS.spi.DNSJavaNameService

All Implemented Interfaces:

NameService

public class DNSJavaNameService
extends Object
implements NameService

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

Field Summary

Fields

Modifier and Type	Field	Description
private boolean	addressesLoaded
private static final String	DOMAIN_PROPERTY
private InetAddress[]	localhostAddresses
private Name	localhostName
private InetAddress[]	localhostNamedAddresses
private static final String	NAMESERVERS_PROPERTY
private static final String	PREFER_V6_PROPERTY
private final boolean	preferV6

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
String	getHostByAddr(byte[] addr)	Performs a reverse DNS lookup.
InetAddress[]	lookupAllHostAddr(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

Field Details

NAMESERVERS_PROPERTY

private static final String NAMESERVERS_PROPERTY

See Also:

• Constant Field Values

DOMAIN_PROPERTY

private static final String DOMAIN_PROPERTY

See Also:

• Constant Field Values

PREFER_V6_PROPERTY

private static final String PREFER_V6_PROPERTY

See Also:

• Constant Field Values

preferV6

private final boolean preferV6

localhostName

private Name localhostName

localhostNamedAddresses

private InetAddress[] localhostNamedAddresses

localhostAddresses

private InetAddress[] localhostAddresses

addressesLoaded

private boolean addressesLoaded

Constructor Details

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 Details

lookupAllHostAddr

public InetAddress[] lookupAllHostAddr(String host)
                                throws UnknownHostException

Performs a forward DNS lookup for the host name.

Specified by:

lookupAllHostAddr in interface NameService

Parameters:

host - The host name to resolve.

Returns:

All the ip addresses found for the host name.

Throws:

UnknownHostException

getHostByAddr

public String getHostByAddr(byte[] addr)
                     throws UnknownHostException

Performs a reverse DNS lookup.

Specified by:

getHostByAddr in interface NameService

Parameters:

addr - The ip address to lookup.

Returns:

The host name found for the ip address.

Throws:

UnknownHostException