org.xbill.DNS

Class ResolverConfig

java.lang.Object

org.xbill.DNS.ResolverConfig

public class ResolverConfig
extends java.lang.Object

A class that tries to locate name servers and the search path to be appended to unqualified names. The following are attempted, in order, until one succeeds.

• The properties 'dns.server' and 'dns.search' (comma delimited lists) are checked. The servers can either be IP addresses or hostnames (which are resolved using Java's built in DNS support).
• The sun.net.dns.ResolverConfiguration class is queried.
• On Unix, /etc/resolv.conf is parsed.
• On Windows, ipconfig/winipcfg is called and its output parsed. This may fail for non-English versions on Windows.
• "localhost" is used as the nameserver, and the search path is empty.

These routines will be called internally when creating Resolvers/Lookups without explicitly specifying server names, and can also be called directly if desired.

Author:

Brian Wellington, Yannick Meudal, Arnt Gulbrandsen

Constructor Summary

Constructors

Constructor and Description
ResolverConfig()

Method Summary

Methods

Modifier and Type	Method and Description
static ResolverConfig	getCurrentConfig() Gets the current configuration
int	ndots() Returns the located ndots value, or the default (1) if not configured.
static void	refresh() Gets the current configuration
Name[]	searchPath() Returns all entries in the located search path
java.lang.String	server() Returns the first located server
java.lang.String[]	servers() Returns all located servers

Methods inherited from class java.lang.Object

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

Constructor Detail

ResolverConfig

public ResolverConfig()

Method Detail

servers

public java.lang.String[] servers()

Returns all located servers

server

public java.lang.String server()

Returns the first located server

searchPath

public Name[] searchPath()

Returns all entries in the located search path

ndots

public int ndots()

Returns the located ndots value, or the default (1) if not configured. Note that ndots can only be configured in a resolv.conf file, and will only take effect if ResolverConfig uses resolv.conf directly (that is, if the JVM does not include the sun.net.dns.ResolverConfiguration class).

getCurrentConfig

public static ResolverConfig getCurrentConfig()

Gets the current configuration

refresh

public static void refresh()

Gets the current configuration