/*************************************************************************
* Copyright 2009-2015 Eucalyptus Systems, Inc.
*
* This program is free software: you can redistribute it and/or modify
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* Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta
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package com.eucalyptus.util.dns;
import java.net.InetAddress;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import org.xbill.DNS.ARecord;
import org.xbill.DNS.CNAMERecord;
import org.xbill.DNS.DClass;
import org.xbill.DNS.Name;
import org.xbill.DNS.PTRRecord;
import org.xbill.DNS.Record;
import org.xbill.DNS.ReverseMap;
import org.xbill.DNS.SOARecord;
import com.eucalyptus.configurable.ConfigurableClass;
import com.eucalyptus.configurable.ConfigurableField;
import com.google.common.net.InetAddresses;
/**
* @author chris grzegorczyk <grze@eucalyptus.com>
*/
@ConfigurableClass( root = "dns",
description = "Configuration options controlling the behaviour of DNS features." )
public class DomainNameRecords {
@ConfigurableField( description = "Time-to-live for all authoritative records" )
private final static long TTL = 60L;
@ConfigurableField( description = "Time-to-live for negative caching on authoritative records" )
private final static long NEGATIVE_TTL = 5L;
public static long ttl( ) {
return TTL;
}
public static long negativeTtl( ) {
return NEGATIVE_TTL;
}
public static List<? extends Record> nameservers( Name subdomain ) {
return DomainNames.nameServerRecords( subdomain );
}
public static SOARecord sourceOfAuthority( Name name ) {
final Name soa = DomainNames.sourceOfAuthority( name );
final Name ns = DomainNames.nameServerRecords( name ).get( 0 ).getTarget( );
SOARecord soaRecord = new SOARecord( name, DClass.IN, TTL, ns,
Name.fromConstantString( "root." + soa ),
DomainNameRecords.serial( ), 1200L, 180L, 2419200L, NEGATIVE_TTL );
return soaRecord;
}
public static SOARecord sourceOfAuthorityStaticSerial( Name name ) {
final Name soa = DomainNames.sourceOfAuthority( name );
final Name ns = DomainNames.nameServerRecords( name ).get( 0 ).getTarget( );
final SOARecord soaRecord = new SOARecord( name, DClass.IN, TTL, ns,
Name.fromConstantString( "root." + soa ),
1, 3600L, 600L, 86400L, 3600L);
return soaRecord;
}
public static Record canonicalName( Name aliasName, Name canonicalName ) {
return new CNAMERecord( aliasName, DClass.IN, TTL, canonicalName );
}
public static InetAddress inAddrArpaToInetAddress( Name name ) {
final String ipString = new StringBuffer( ).append( name.getLabelString( 3 ) )
.append( "." )
.append( name.getLabelString( 2 ) )
.append( "." )
.append( name.getLabelString( 1 ) )
.append( "." )
.append( name.getLabelString( 0 ) )
.toString( );
return InetAddresses.forString( ipString );
}
public static Record ptrRecord( Name name, Name inAddrArpa ) {
return ptrRecord( name, inAddrArpaToInetAddress( inAddrArpa ) );
}
public static Record ptrRecord( Name name, InetAddress ip ) {
return new PTRRecord( ReverseMap.fromAddress( ip ), DClass.IN, TTL, name );
}
public static Record addressRecord( Name name, InetAddress ip ) {
return addressRecord( name, ip, TTL );
}
public static Record addressRecord( Name name, InetAddress ip, long ttl ) {
return new ARecord( name, DClass.IN, ttl, ip );
}
static long serial( ) {
return Long.parseLong( DomainNameRecords.SERIALFORMATTER.format( new Date( ) ) );
}
static final DateFormat SERIALFORMATTER = new SimpleDateFormat( "yyMMddHHmm" );
}