org.xbill.DNS

Class OPTRecord

java.lang.Object

org.xbill.DNS.Record

org.xbill.DNS.OPTRecord

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.lang.Comparable

public class OPTRecord
extends Record

Options - describes Extended DNS (EDNS) properties of a Message. No specific options are defined other than those specified in the header. An OPT should be generated by Resolver. EDNS is a method to extend the DNS protocol while providing backwards compatibility and not significantly changing the protocol. This implementation of EDNS is mostly complete at level 0.

Author:

Brian Wellington

See Also:

Message, Resolver, Serialized Form

Field Summary

Fields inherited from class org.xbill.DNS.Record

dclass, name, ttl, type

Constructor Summary

Constructors

Constructor and Description
OPTRecord(int payloadSize, int xrcode, int version) Creates an OPT Record with no data.
OPTRecord(int payloadSize, int xrcode, int version, int flags) Creates an OPT Record with no data.
OPTRecord(int payloadSize, int xrcode, int version, int flags, java.util.List options) Creates an OPT Record.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(java.lang.Object arg) Determines if two OPTRecords are identical.
int	getExtendedRcode() Returns the extended Rcode
int	getFlags() Returns the EDNS flags
java.util.List	getOptions() Gets all options in the OPTRecord.
java.util.List	getOptions(int code) Gets all options in the OPTRecord with a specific code.
int	getPayloadSize() Returns the maximum allowed payload size.
int	getVersion() Returns the highest supported EDNS version

Methods inherited from class org.xbill.DNS.Record

byteArrayFromString, byteArrayToString, compareTo, fromString, fromString, fromWire, getAdditionalName, getDClass, getName, getRRsetType, getTTL, getType, hashCode, newRecord, newRecord, newRecord, newRecord, rdataToString, rdataToWireCanonical, sameRRset, toString, toWire, toWireCanonical, unknownToString, withName

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

OPTRecord

public OPTRecord(int payloadSize,
         int xrcode,
         int version,
         int flags,
         java.util.List options)

Creates an OPT Record. This is normally called by SimpleResolver, but can also be called by a server.

Parameters:

payloadSize - The size of a packet that can be reassembled on the sending host.

xrcode - The value of the extended rcode field. This is the upper 16 bits of the full rcode.

flags - Additional message flags.

version - The EDNS version that this DNS implementation supports. This should be 0 for dnsjava.

options - The list of options that comprise the data field. There are currently no defined options.

See Also:

ExtendedFlags

OPTRecord

public OPTRecord(int payloadSize,
         int xrcode,
         int version,
         int flags)

Creates an OPT Record with no data. This is normally called by SimpleResolver, but can also be called by a server.

Parameters:

payloadSize - The size of a packet that can be reassembled on the sending host.

xrcode - The value of the extended rcode field. This is the upper 16 bits of the full rcode.

flags - Additional message flags.

version - The EDNS version that this DNS implementation supports. This should be 0 for dnsjava.

See Also:

ExtendedFlags

OPTRecord

public OPTRecord(int payloadSize,
         int xrcode,
         int version)

Creates an OPT Record with no data. This is normally called by SimpleResolver, but can also be called by a server.

Method Detail

getPayloadSize

public int getPayloadSize()

Returns the maximum allowed payload size.

getExtendedRcode

public int getExtendedRcode()

Returns the extended Rcode

See Also:

Rcode

getVersion

public int getVersion()

Returns the highest supported EDNS version

getFlags

public int getFlags()

Returns the EDNS flags

getOptions

public java.util.List getOptions()

Gets all options in the OPTRecord. This returns a list of EDNSOptions.

getOptions

public java.util.List getOptions(int code)

Gets all options in the OPTRecord with a specific code. This returns a list of EDNSOptions.

equals

public boolean equals(java.lang.Object arg)

Determines if two OPTRecords are identical. This compares the name, type, class, and rdata (with names canonicalized). Additionally, because TTLs are relevant for OPT records, the TTLs are compared.

Overrides:

equals in class Record

Parameters:

arg - The record to compare to

Returns:

true if the records are equal, false otherwise.