org.apache.directory.server.dns.io.decoder

Class DnsMessageDecoder

java.lang.Object

org.apache.directory.server.dns.io.decoder.DnsMessageDecoder

public class DnsMessageDecoder
extends java.lang.Object

A decoder for DNS messages. The primary usage of the DnsMessageDecoder is by calling the decode(ByteBuffer) method which will read the message from the incoming ByteBuffer and build a DnsMessage from it according to the DnsMessage encoding in RFC-1035.

Field Summary

Fields

Modifier and Type	Field and Description
private static java.util.Map<RecordType,RecordDecoder>	DEFAULT_DECODERS A Hashed Adapter mapping record types to their encoders.
private org.slf4j.Logger	logger

Constructor Summary

Constructors

Constructor and Description
DnsMessageDecoder()

Method Summary

Modifier and Type	Method and Description
DnsMessage	decode(org.apache.mina.core.buffer.IoBuffer in) Decode the IoBuffer into a DnsMessage.
private java.util.Map<java.lang.String,java.lang.Object>	decode(org.apache.mina.core.buffer.IoBuffer byteBuffer, RecordType type, short length)
private boolean	decodeAuthoritativeAnswer(byte header)
private MessageType	decodeMessageType(byte header)
private OpCode	decodeOpCode(byte header)
private boolean	decodeRecursionAvailable(byte header)
private boolean	decodeRecursionDesired(byte header)
private ResponseCode	decodeResponseCode(byte header)
private boolean	decodeTruncated(byte header)
(package private) static java.lang.String	getDomainName(org.apache.mina.core.buffer.IoBuffer byteBuffer)
(package private) static void	getLabel(org.apache.mina.core.buffer.IoBuffer byteBuffer, java.lang.StringBuffer domainName, int labelLength)
private java.util.List<QuestionRecord>	getQuestions(org.apache.mina.core.buffer.IoBuffer byteBuffer, short questionCount)
private java.util.List<ResourceRecord>	getRecords(org.apache.mina.core.buffer.IoBuffer byteBuffer, short recordCount)
(package private) static boolean	isLabel(int length)
(package private) static boolean	isOffset(int length)
(package private) static void	recurseDomainName(org.apache.mina.core.buffer.IoBuffer byteBuffer, java.lang.StringBuffer domainName)

Methods inherited from class java.lang.Object

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

Field Detail

logger

private final org.slf4j.Logger logger

DEFAULT_DECODERS

private static final java.util.Map<RecordType,RecordDecoder> DEFAULT_DECODERS

A Hashed Adapter mapping record types to their encoders.

Constructor Detail

DnsMessageDecoder

public DnsMessageDecoder()

Method Detail

decode

public DnsMessage decode(org.apache.mina.core.buffer.IoBuffer in)
                  throws java.io.IOException

Decode the IoBuffer into a DnsMessage.

Parameters:

in -

Returns:

The DnsMessage.

Throws:

java.io.IOException

getRecords

private java.util.List<ResourceRecord> getRecords(org.apache.mina.core.buffer.IoBuffer byteBuffer,
                                                  short recordCount)
                                           throws java.io.IOException

Throws:

java.io.IOException

decode

private java.util.Map<java.lang.String,java.lang.Object> decode(org.apache.mina.core.buffer.IoBuffer byteBuffer,
                                                                RecordType type,
                                                                short length)
                                                         throws java.io.IOException

Throws:

java.io.IOException

getQuestions

private java.util.List<QuestionRecord> getQuestions(org.apache.mina.core.buffer.IoBuffer byteBuffer,
                                                    short questionCount)

getDomainName

static java.lang.String getDomainName(org.apache.mina.core.buffer.IoBuffer byteBuffer)

recurseDomainName

static void recurseDomainName(org.apache.mina.core.buffer.IoBuffer byteBuffer,
                              java.lang.StringBuffer domainName)

isOffset

static boolean isOffset(int length)

isLabel

static boolean isLabel(int length)

getLabel

static void getLabel(org.apache.mina.core.buffer.IoBuffer byteBuffer,
                     java.lang.StringBuffer domainName,
                     int labelLength)

decodeMessageType

private MessageType decodeMessageType(byte header)

decodeOpCode

private OpCode decodeOpCode(byte header)

decodeAuthoritativeAnswer

private boolean decodeAuthoritativeAnswer(byte header)

decodeTruncated

private boolean decodeTruncated(byte header)

decodeRecursionDesired

private boolean decodeRecursionDesired(byte header)

decodeRecursionAvailable

private boolean decodeRecursionAvailable(byte header)

decodeResponseCode

private ResponseCode decodeResponseCode(byte header)