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                    |
 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

Author:: Kaito Yamada
See Also:: RFC 1035, RFC 2535, Serialized Form

Method Summary

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

- 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

Class DnsPacket.DnsHeader

Method Summary

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

Methods inherited from class java.lang.Object

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