java.lang.Object
- org.pcap4j.packet.AbstractPacket.AbstractHeader
- - org.pcap4j.packet.DnsPacket.DnsHeader

All Implemented Interfaces:: java.io.Serializable, Packet.Header

Enclosing class:: DnsPacket

public static final class DnsPacket.DnsHeader
extends AbstractPacket.AbstractHeader

DNS header

 +---------------------+
 |        Header       |
 +---------------------+
 |       Question      | the question for the name server
 +---------------------+
 |        Answer       | RRs answering the question
 +---------------------+
 |      Authority      | RRs pointing toward an authority
 +---------------------+
 |      Additional     | RRs holding additional information
 +---------------------+

 Header:
                                 1  1  1  1  1  1
   0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5
 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 |                      ID                       |
 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 |QR|   Opcode  |AA|TC|RD|RA| Z|AD|CD|   RCODE   |
 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 |                    QDCOUNT                    |
 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 |                    ANCOUNT                    |
 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 |                    NSCOUNT                    |
 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 |                    ARCOUNT                    |
 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

Version:: pcap4j 1.7.1
See Also:: RFC 1035, RFC 2535, Serialized Form

Field Summary

Fields
Modifier and Type	Field	Description
`private java.util.List<DnsResourceRecord>`	`additionalInfo`
`private short`	`anCount`
`private static int`	`ANCOUNT_OFFSET`
`private static int`	`ANCOUNT_SIZE`
`private java.util.List<DnsResourceRecord>`	`answers`
`private short`	`arCount`
`private static int`	`ARCOUNT_OFFSET`
`private static int`	`ARCOUNT_SIZE`
`private boolean`	`authenticData`
`private boolean`	`authoritativeAnswer`
`private java.util.List<DnsResourceRecord>`	`authorities`
`private boolean`	`checkingDisabled`
`private static int`	`DNS_MIN_HEADER_SIZE`
`private static int`	`FLAGS_OFFSET`
`private static int`	`FLAGS_SIZE`
`private short`	`id`
`private static int`	`ID_OFFSET`
`private static int`	`ID_SIZE`
`private short`	`nsCount`
`private static int`	`NSCOUNT_OFFSET`
`private static int`	`NSCOUNT_SIZE`
`private DnsOpCode`	`opCode`
`private short`	`qdCount`
`private static int`	`QDCOUNT_OFFSET`
`private static int`	`QDCOUNT_SIZE`
`private java.util.List<DnsQuestion>`	`questions`
`private DnsRCode`	`rCode`
`private boolean`	`recursionAvailable`
`private boolean`	`recursionDesired`
`private boolean`	`reserved`
`private boolean`	`response`
`private static long`	`serialVersionUID`
`private boolean`	`truncated`

Constructor Summary

Constructors
Modifier Constructor Description

private DnsHeader(byte[] rawData, int offset, int length)

private DnsHeader(DnsPacket.Builder builder)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected java.lang.String`	`buildString()`	This method builds the value `toString()` will return.
`protected int`	`calcHashCode()`	This method builds the value `hashCode()` will return using the byte array `getRawData()` returns.
`boolean`	`equals(java.lang.Object obj)`	Indicates whether some other object is "equal to" this one using return values of `getRawData()`.
`java.util.List<DnsResourceRecord>`	`getAdditionalInfo()`
`short`	`getAnCount()`
`int`	`getAnCountAsInt()`
`java.util.List<DnsResourceRecord>`	`getAnswers()`
`short`	`getArCount()`
`int`	`getArCountAsInt()`
`java.util.List<DnsResourceRecord>`	`getAuthorities()`
`short`	`getId()`
`short`	`getNsCount()`
`int`	`getNsCountAsInt()`
`DnsOpCode`	`getOpCode()`
`short`	`getQdCount()`
`int`	`getQdCountAsInt()`
`java.util.List<DnsQuestion>`	`getQuestions()`
`protected java.util.List<byte[]>`	`getRawFields()`	Returns a list of byte arrays which represents this header's fields.
`DnsRCode`	`getrCode()`
`boolean`	`getReservedBit()`
`boolean`	`isAuthenticData()`
`boolean`	`isAuthoritativeAnswer()`
`boolean`	`isCheckingDisabled()`
`boolean`	`isRecursionAvailable()`
`boolean`	`isRecursionDesired()`
`boolean`	`isResponse()`
`boolean`	`isTruncated()`
`int`	`length()`	Returns the header length in bytes.

Methods inherited from class org.pcap4j.packet.AbstractPacket.AbstractHeader
buildHexString, buildRawData, calcLength, getRawData, hashCode, toHexString, toString

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - serialVersionUID
```
private static final long serialVersionUID
```
    See Also:
    
    Constant Field Values
  - ID_OFFSET
```
private static final int ID_OFFSET
```
    See Also:
    
    Constant Field Values
  - ID_SIZE
```
private static final int ID_SIZE
```
    See Also:
    
    Constant Field Values
  - FLAGS_OFFSET
```
private static final int FLAGS_OFFSET
```
    See Also:
    
    Constant Field Values
  - FLAGS_SIZE
```
private static final int FLAGS_SIZE
```
    See Also:
    
    Constant Field Values
  - QDCOUNT_OFFSET
```
private static final int QDCOUNT_OFFSET
```
    See Also:
    
    Constant Field Values
  - QDCOUNT_SIZE
```
private static final int QDCOUNT_SIZE
```
    See Also:
    
    Constant Field Values
  - ANCOUNT_OFFSET
```
private static final int ANCOUNT_OFFSET
```
    See Also:
    
    Constant Field Values
  - ANCOUNT_SIZE
```
private static final int ANCOUNT_SIZE
```
    See Also:
    
    Constant Field Values
  - NSCOUNT_OFFSET
```
private static final int NSCOUNT_OFFSET
```
    See Also:
    
    Constant Field Values
  - NSCOUNT_SIZE
```
private static final int NSCOUNT_SIZE
```
    See Also:
    
    Constant Field Values
  - ARCOUNT_OFFSET
```
private static final int ARCOUNT_OFFSET
```
    See Also:
    
    Constant Field Values
  - ARCOUNT_SIZE
```
private static final int ARCOUNT_SIZE
```
    See Also:
    
    Constant Field Values
  - DNS_MIN_HEADER_SIZE
```
private static final int DNS_MIN_HEADER_SIZE
```
    See Also:
    
    Constant Field Values
  - id
```
private final short id
```
  - response
```
private final boolean response
```
  - opCode
```
private final DnsOpCode opCode
```
  - authoritativeAnswer
```
private final boolean authoritativeAnswer
```
  - truncated
```
private final boolean truncated
```
  - recursionDesired
```
private final boolean recursionDesired
```
  - recursionAvailable
```
private final boolean recursionAvailable
```
  - reserved
```
private final boolean reserved
```
  - authenticData
```
private final boolean authenticData
```
  - checkingDisabled
```
private final boolean checkingDisabled
```
  - rCode
```
private final DnsRCode rCode
```
  - qdCount
```
private final short qdCount
```
  - anCount
```
private final short anCount
```
  - nsCount
```
private final short nsCount
```
  - arCount
```
private final short arCount
```
  - questions
```
private final java.util.List<DnsQuestion> questions
```
  - answers
```
private final java.util.List<DnsResourceRecord> answers
```
  - authorities
```
private final java.util.List<DnsResourceRecord> authorities
```
  - additionalInfo
```
private final java.util.List<DnsResourceRecord> additionalInfo
```
- Constructor Detail
  - DnsHeader
```
private DnsHeader(byte[] rawData,
                  int offset,
                  int length)
           throws IllegalRawDataException
```
    Throws:
    
    IllegalRawDataException
  - DnsHeader
```
private DnsHeader(DnsPacket.Builder builder)
```
- Method Detail
  - getId
```
public short getId()
```
    Returns:
    
    id
  - isResponse
```
public boolean isResponse()
```
    Returns:
    
    true if the QR bit is set to 1; false otherwise.
  - getOpCode
```
public DnsOpCode getOpCode()
```
    Returns:
    
    opCode
  - isAuthoritativeAnswer
```
public boolean isAuthoritativeAnswer()
```
    Returns:
    
    true if the AA bit is set to 1; false otherwise.
  - isTruncated
```
public boolean isTruncated()
```
    Returns:
    
    true if the TC bit is set to 1; false otherwise.
  - isRecursionDesired
```
public boolean isRecursionDesired()
```
    Returns:
    
    true if the RD bit is set to 1; false otherwise.
  - isRecursionAvailable
```
public boolean isRecursionAvailable()
```
    Returns:
    
    true if the RA bit is set to 1; false otherwise.
  - getReservedBit
```
public boolean getReservedBit()
```
    Returns:
    
    true if the Z bit is set to 1; false otherwise.
  - isAuthenticData
```
public boolean isAuthenticData()
```
    Returns:
    
    true if the AD bit is set to 1; false otherwise.
  - isCheckingDisabled
```
public boolean isCheckingDisabled()
```
    Returns:
    
    true if the CD bit is set to 1; false otherwise.
  - getrCode
```
public DnsRCode getrCode()
```
    Returns:
    
    rCode
  - getQdCount
```
public short getQdCount()
```
    Returns:
    
    qdCount
  - getQdCountAsInt
```
public int getQdCountAsInt()
```
    Returns:
    
    qdCount
  - getAnCount
```
public short getAnCount()
```
    Returns:
    
    anCount
  - getAnCountAsInt
```
public int getAnCountAsInt()
```
    Returns:
    
    anCount
  - getNsCount
```
public short getNsCount()
```
    Returns:
    
    nsCount
  - getNsCountAsInt
```
public int getNsCountAsInt()
```
    Returns:
    
    nsCount
  - getArCount
```
public short getArCount()
```
    Returns:
    
    arCount
  - getArCountAsInt
```
public int getArCountAsInt()
```
    Returns:
    
    arCount
  - getQuestions
```
public java.util.List<DnsQuestion> getQuestions()
```
    Returns:
    
    questions
  - getAnswers
```
public java.util.List<DnsResourceRecord> getAnswers()
```
    Returns:
    
    answers
  - getAuthorities
```
public java.util.List<DnsResourceRecord> getAuthorities()
```
    Returns:
    
    authorities
  - getAdditionalInfo
```
public java.util.List<DnsResourceRecord> getAdditionalInfo()
```
    Returns:
    
    additionalInfo
  - getRawFields
```
protected java.util.List<byte[]> getRawFields()
```
    Description copied from class: AbstractPacket.AbstractHeader
    
    Returns a list of byte arrays which represents this header's fields. This method is called by calcLength() and buildRawData().
    
    Specified by:
    
    getRawFields in class AbstractPacket.AbstractHeader
    
    Returns:
    
    a list of byte arrays which represents this header's fields
  - length
```
public int length()
```
    Description copied from class: AbstractPacket.AbstractHeader
    
    Returns the header length in bytes. This method calls calcLength() and caches the return value when it is called for the first time, and then, this method returns the cached value from the second time.
    
    Specified by:
    
    length in interface Packet.Header
    
    Overrides:
    
    length in class AbstractPacket.AbstractHeader
    
    Returns:
    
    the length of the byte stream of the header represented by this object in bytes
  - buildString
```
protected java.lang.String buildString()
```
    Description copied from class: AbstractPacket.AbstractHeader
    
    This method builds the value toString() will return.
    
    Overrides:
    
    buildString in class AbstractPacket.AbstractHeader
    
    Returns:
    
    a string representation of this object
  - equals
```
public boolean equals(java.lang.Object obj)
```
    Description copied from class: AbstractPacket.AbstractHeader
    
    Indicates whether some other object is "equal to" this one using return values of getRawData(). This method should be overridden so that it does more strict comparisons more efficiently.
    
    Overrides:
    
    equals in class AbstractPacket.AbstractHeader
  - calcHashCode
```
protected int calcHashCode()
```
    Description copied from class: AbstractPacket.AbstractHeader
    
    This method builds the value hashCode() will return using the byte array getRawData() returns. This method may be better to be overridden for performance reason.
    
    Overrides:
    
    calcHashCode in class AbstractPacket.AbstractHeader
    
    Returns:
    
    a calculated hash code value for the object

Modifier	Constructor	Description
`private`	`DnsHeader(byte[] rawData, int offset, int length)`
`private`	`DnsHeader(DnsPacket.Builder builder)`

Class DnsPacket.DnsHeader

Field Summary

Constructor Summary

Method Summary

Methods inherited from class org.pcap4j.packet.AbstractPacket.AbstractHeader

Methods inherited from class java.lang.Object

Field Detail

serialVersionUID

ID_OFFSET

ID_SIZE

FLAGS_OFFSET

FLAGS_SIZE

QDCOUNT_OFFSET

QDCOUNT_SIZE

ANCOUNT_OFFSET

ANCOUNT_SIZE

NSCOUNT_OFFSET

NSCOUNT_SIZE

ARCOUNT_OFFSET

ARCOUNT_SIZE

DNS_MIN_HEADER_SIZE

id

response

opCode

authoritativeAnswer

truncated

recursionDesired

recursionAvailable

reserved

authenticData

checkingDisabled

rCode

qdCount

anCount

nsCount

arCount

questions

answers

authorities

additionalInfo

Constructor Detail

DnsHeader

DnsHeader

Method Detail

getId

isResponse

getOpCode

isAuthoritativeAnswer

isTruncated

isRecursionDesired

isRecursionAvailable

getReservedBit

isAuthenticData

isCheckingDisabled

getrCode

getQdCount

getQdCountAsInt

getAnCount

getAnCountAsInt

getNsCount

getNsCountAsInt

getArCount

getArCountAsInt

getQuestions

getAnswers

getAuthorities

getAdditionalInfo

getRawFields

length

buildString

equals

calcHashCode