java.lang.Object
- com.github.markusbernhardt.proxy.search.wpad.dhcp.DHCPMessage

```
public class DHCPMessage
extends Object
```
This class represents a DHCP Message.

Author:

Markus Bernhardt, Copyright 2016, Jason Goldschmidt, Nick Stone and Simon Frankenberger, Bernd Rosstauscher, Copyright 2009

Field Summary

Fields
Modifier and Type	Field	Description
`static InetAddress`	`BROADCAST_ADDR`	Broadcast Adress to send packets to
`static int`	`CLIENT_PORT`	Default DHCP client port
`static byte`	`DHCPACK`	Message Code representing a DHCPACK message
`static byte`	`DHCPDECLINE`	Message Code representing a DHCPDECLINE message
`static byte`	`DHCPDISCOVER`	Message Code representing a DHCPDISCOVER message
`static byte`	`DHCPINFORM`	Message Code representing a DHCPINFORM message
`static byte`	`DHCPNAK`	Message Code representing a DHCPNAK message
`static byte`	`DHCPOFFER`	Message Code representing a DHCPOFFER message
`static byte`	`DHCPRELEASE`	Message Code representing a DHCPRELEASE message
`static byte`	`DHCPREQUEST`	Message Code representing a DHCPREQUEST message
`static byte`	`OP_REPLY`	Operation for a reply
`static byte`	`OP_REQUEST`	Operation for a request
`static int`	`SERVER_PORT`	Default DHCP server port

Constructor Summary

Constructors
Constructor	Description
`DHCPMessage()`	Creates empty DHCPMessage object, initializes the object, sets the host to the broadcast address, the local subnet, binds to the default server port.
`DHCPMessage(byte[] ibuf)`	Creates an empty DHCPMessage object, initializes the object with a specified byte array containing DHCP message information, sets the host to default host name, the local subnet, and bind to the default server port.
`DHCPMessage(byte[] ibuf, int inPort)`	Creates an empty DHCPMessage object, initializes the object with a specified byte array containing DHCP message information, sets the host to broadcast address, and binds to the specified port.
`DHCPMessage(byte[] ibuf, InetAddress inServername)`	Creates an empty DHCPMessage object, initializes the object with a specified byte array containing DHCP message information, sets the host to specified host name, and binds to the specified port.
`DHCPMessage(byte[] ibuf, InetAddress inServername, int inPort)`	Creates an empty DHCPMessage object, initializes the object with a specified byte array containing DHCP message information, sets the host to specified host name, and binds to the specified port.
`DHCPMessage(int inPort)`	Creates an empty DHCPMessage object, initializes the object, sets the host to the broadcast address, and binds to a specified port.
`DHCPMessage(DHCPMessage inMessage)`	Copy constructor creates DHCPMessage from inMessage
`DHCPMessage(DHCPMessage inMessage, InetAddress inServername)`	Copy constructor creates DHCPMessage from inMessage and sets server name.
`DHCPMessage(DHCPMessage inMessage, InetAddress inServername, int inPort)`	Copy constructor creates DHCPMessage from inMessage and sets server and port.
`DHCPMessage(DataInputStream inStream)`	Creates a new DHCPMessage object from the giben DataInputStream.
`DHCPMessage(InetAddress inServername)`	Creates an empty DHCPMessage object, initializes the object, sets the host to a specified host name, and binds to the default port.
`DHCPMessage(InetAddress inServername, int inPort)`	Creates an empty DHCPMessage object, initializes the object, sets the host to a specified host name, and binds to a specified port.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`byte[]`	`externalize()`	Converts a DHCPMessage object to a byte array.
`byte[]`	`getChaddr()`
`byte[]`	`getCiaddr()`
`String`	`getDestinationAddress()`	Get message destination hostname
`byte[]`	`getFile()`
`short`	`getFlags()`
`byte[]`	`getGiaddr()`
`byte`	`getHlen()`
`byte`	`getHops()`
`byte`	`getHtype()`
`byte`	`getOp()`
`byte[]`	`getOption(int inOptNum)`	Returns specified DHCP option that matches the input code.
`byte[]`	`getOptions()`
`int`	`getPort()`
`short`	`getSecs()`
`byte[]`	`getSiaddr()`
`byte[]`	`getSname()`
`int`	`getXid()`
`byte[]`	`getYiaddr()`
`DHCPMessage`	`internalize(byte[] ibuff)`	Convert a specified byte array containing a DHCP message into a DHCPMessage object.
`boolean`	`IsOptSet(int inOptNum)`	Report whether or not the input option is set.
`void`	`removeOption(int inOptNum)`	Removes the specified DHCP option that matches the input code.
`void`	`setChaddr(byte[] inChaddr)`	Set client harware address.
`void`	`setCiaddr(byte[] inCiaddr)`	Set client IP address.
`void`	`setDestinationHost(String inHost)`	Set message destination IP
`void`	`setFile(byte[] inFile)`	Set boot file name.
`void`	`setFlags(short inFlags)`	Set flags field.
`void`	`setGiaddr(byte[] inGiaddr)`	Set relay agent IP address.
`void`	`setHlen(byte inHlen)`	Set hardware address length.
`void`	`setHops(byte inHops)`	Set hops field.
`void`	`setHtype(byte inHtype)`	Set hardware address type.
`void`	`setOp(byte inOp)`	Set message Op code / message type.
`void`	`setOption(int inOptNum, byte[] inOptionData)`	Sets DHCP options in DHCPMessage.
`void`	`setPort(int inPortNum)`	Set message destination port.
`void`	`setSecs(short inSecs)`	Set seconds elapsed since client began address acquisition or renewal process.
`void`	`setSiaddr(byte[] inSiaddr)`	Set address of next server to use in bootstrap.
`void`	`setSname(byte[] inSname)`	Set optional server host name.
`void`	`setXid(int inXid)`	Set transaction ID.
`void`	`setYiaddr(byte[] inYiaddr)`	Set 'your' (client) IP address.

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

- Field Detail
  - OP_REQUEST
```
public static final byte OP_REQUEST
```
    Operation for a request
    
    See Also:
    
    Constant Field Values
  - OP_REPLY
```
public static final byte OP_REPLY
```
    Operation for a reply
    
    See Also:
    
    Constant Field Values
  - DHCPDISCOVER
```
public static final byte DHCPDISCOVER
```
    Message Code representing a DHCPDISCOVER message
    
    See Also:
    
    Constant Field Values
  - DHCPOFFER
```
public static final byte DHCPOFFER
```
    Message Code representing a DHCPOFFER message
    
    See Also:
    
    Constant Field Values
  - DHCPREQUEST
```
public static final byte DHCPREQUEST
```
    Message Code representing a DHCPREQUEST message
    
    See Also:
    
    Constant Field Values
  - DHCPDECLINE
```
public static final byte DHCPDECLINE
```
    Message Code representing a DHCPDECLINE message
    
    See Also:
    
    Constant Field Values
  - DHCPACK
```
public static final byte DHCPACK
```
    Message Code representing a DHCPACK message
    
    See Also:
    
    Constant Field Values
  - DHCPNAK
```
public static final byte DHCPNAK
```
    Message Code representing a DHCPNAK message
    
    See Also:
    
    Constant Field Values
  - DHCPRELEASE
```
public static final byte DHCPRELEASE
```
    Message Code representing a DHCPRELEASE message
    
    See Also:
    
    Constant Field Values
  - DHCPINFORM
```
public static final byte DHCPINFORM
```
    Message Code representing a DHCPINFORM message
    
    See Also:
    
    Constant Field Values
  - CLIENT_PORT
```
public static final int CLIENT_PORT
```
    Default DHCP client port
    
    See Also:
    
    Constant Field Values
  - SERVER_PORT
```
public static final int SERVER_PORT
```
    Default DHCP server port
    
    See Also:
    
    Constant Field Values
  - BROADCAST_ADDR
```
public static InetAddress BROADCAST_ADDR
```
    Broadcast Adress to send packets to
- Constructor Detail
  - DHCPMessage
```
public DHCPMessage()
```
    Creates empty DHCPMessage object, initializes the object, sets the host to the broadcast address, the local subnet, binds to the default server port.
  - DHCPMessage
```
public DHCPMessage(DHCPMessage inMessage)
```
    Copy constructor creates DHCPMessage from inMessage
    
    Parameters:
    
    inMessage - The message to be copied
  - DHCPMessage
```
public DHCPMessage(DHCPMessage inMessage,
                   InetAddress inServername,
                   int inPort)
```
    Copy constructor creates DHCPMessage from inMessage and sets server and port.
    
    Parameters:
    
    inMessage - The message to be copied
    
    inServername - The host name
    
    inPort - The port number
  - DHCPMessage
```
public DHCPMessage(DHCPMessage inMessage,
                   InetAddress inServername)
```
    Copy constructor creates DHCPMessage from inMessage and sets server name.
    
    Parameters:
    
    inMessage - The message to be copied
    
    inServername - The host name
  - DHCPMessage
```
public DHCPMessage(InetAddress inServername,
                   int inPort)
```
    Creates an empty DHCPMessage object, initializes the object, sets the host to a specified host name, and binds to a specified port.
    
    Parameters:
    
    inServername - The host name
    
    inPort - The port number
  - DHCPMessage
```
public DHCPMessage(InetAddress inServername)
```
    Creates an empty DHCPMessage object, initializes the object, sets the host to a specified host name, and binds to the default port.
    
    Parameters:
    
    inServername - The host name
  - DHCPMessage
```
public DHCPMessage(int inPort)
```
    Creates an empty DHCPMessage object, initializes the object, sets the host to the broadcast address, and binds to a specified port.
    
    Parameters:
    
    inPort - The port number
  - DHCPMessage
```
public DHCPMessage(byte[] ibuf)
```
    Creates an empty DHCPMessage object, initializes the object with a specified byte array containing DHCP message information, sets the host to default host name, the local subnet, and bind to the default server port.
    
    Parameters:
    
    ibuf - The byte array to initialize DHCPMessage object
  - DHCPMessage
```
public DHCPMessage(byte[] ibuf,
                   InetAddress inServername,
                   int inPort)
```
    Creates an empty DHCPMessage object, initializes the object with a specified byte array containing DHCP message information, sets the host to specified host name, and binds to the specified port.
    
    Parameters:
    
    ibuf - The byte array to initialize DHCPMessage object
    
    inServername - The hostname
    
    inPort - The port number
  - DHCPMessage
```
public DHCPMessage(byte[] ibuf,
                   int inPort)
```
    Creates an empty DHCPMessage object, initializes the object with a specified byte array containing DHCP message information, sets the host to broadcast address, and binds to the specified port.
    
    Parameters:
    
    ibuf - The byte array to initialize DHCPMessage object
    
    inPort - The port number
  - DHCPMessage
```
public DHCPMessage(byte[] ibuf,
                   InetAddress inServername)
```
    Creates an empty DHCPMessage object, initializes the object with a specified byte array containing DHCP message information, sets the host to specified host name, and binds to the specified port.
    
    Parameters:
    
    ibuf - The byte array to initialize DHCPMessage object
    
    inServername - The hostname
  - DHCPMessage
```
public DHCPMessage(DataInputStream inStream)
```
    Creates a new DHCPMessage object from the giben DataInputStream.
    
    Parameters:
    
    inStream - The stream to read from
- Method Detail
  - externalize
```
public byte[] externalize()
```
    Converts a DHCPMessage object to a byte array.
    
    Returns:
    
    A byte array with information from DHCPMessage object, ready to send.
  - internalize
```
public DHCPMessage internalize(byte[] ibuff)
```
    Convert a specified byte array containing a DHCP message into a DHCPMessage object.
    
    Parameters:
    
    ibuff - Byte array to convert to a DHCPMessage object
    
    Returns:
    
    A DHCPMessage object with information from byte array.
  - setOp
```
public void setOp(byte inOp)
```
    Set message Op code / message type.
    
    Parameters:
    
    inOp - message Op code / message type
  - setHtype
```
public void setHtype(byte inHtype)
```
    Set hardware address type.
    
    Parameters:
    
    inHtype - hardware address type
  - setHlen
```
public void setHlen(byte inHlen)
```
    Set hardware address length.
    
    Parameters:
    
    inHlen - hardware address length
  - setHops
```
public void setHops(byte inHops)
```
    Set hops field.
    
    Parameters:
    
    inHops - hops field
  - setXid
```
public void setXid(int inXid)
```
    Set transaction ID.
    
    Parameters:
    
    inXid - transactionID
  - setSecs
```
public void setSecs(short inSecs)
```
    Set seconds elapsed since client began address acquisition or renewal process.
    
    Parameters:
    
    inSecs - Seconds elapsed since client began address acquisition or renewal process
  - setFlags
```
public void setFlags(short inFlags)
```
    Set flags field.
    
    Parameters:
    
    inFlags - flags field
  - setCiaddr
```
public void setCiaddr(byte[] inCiaddr)
```
    Set client IP address.
    
    Parameters:
    
    inCiaddr - client IP address
  - setYiaddr
```
public void setYiaddr(byte[] inYiaddr)
```
    Set 'your' (client) IP address.
    
    Parameters:
    
    inYiaddr - 'your' (client) IP address
  - setSiaddr
```
public void setSiaddr(byte[] inSiaddr)
```
    Set address of next server to use in bootstrap.
    
    Parameters:
    
    inSiaddr - address of next server to use in bootstrap
  - setGiaddr
```
public void setGiaddr(byte[] inGiaddr)
```
    Set relay agent IP address.
    
    Parameters:
    
    inGiaddr - relay agent IP address
  - setChaddr
```
public void setChaddr(byte[] inChaddr)
```
    Set client harware address.
    
    Parameters:
    
    inChaddr - client hardware address
  - setSname
```
public void setSname(byte[] inSname)
```
    Set optional server host name.
    
    Parameters:
    
    inSname - server host name
  - setFile
```
public void setFile(byte[] inFile)
```
    Set boot file name.
    
    Parameters:
    
    inFile - boot file name
  - setPort
```
public void setPort(int inPortNum)
```
    Set message destination port.
    
    Parameters:
    
    inPortNum - port on message destination host
  - setDestinationHost
```
public void setDestinationHost(String inHost)
```
    Set message destination IP
    
    Parameters:
    
    inHost - string representation of message destination IP or hostname
  - getOp
```
public byte getOp()
```
    Returns:
    
    message Op code / message type.
  - getHtype
```
public byte getHtype()
```
    Returns:
    
    hardware address type.
  - getHlen
```
public byte getHlen()
```
    Returns:
    
    hardware address length.
  - getHops
```
public byte getHops()
```
    Returns:
    
    hops field.
  - getXid
```
public int getXid()
```
    Returns:
    
    transaction ID.
  - getSecs
```
public short getSecs()
```
    Returns:
    
    seconds elapsed since client began address acquisition or renewal process.
  - getFlags
```
public short getFlags()
```
    Returns:
    
    flags field.
  - getCiaddr
```
public byte[] getCiaddr()
```
    Returns:
    
    client IP address.
  - getYiaddr
```
public byte[] getYiaddr()
```
    Returns:
    
    'your' (client) IP address.
  - getSiaddr
```
public byte[] getSiaddr()
```
    Returns:
    
    address of next server to use in bootstrap.
  - getGiaddr
```
public byte[] getGiaddr()
```
    Returns:
    
    relay agent IP address.
  - getChaddr
```
public byte[] getChaddr()
```
    Returns:
    
    client harware address.
  - getSname
```
public byte[] getSname()
```
    Returns:
    
    optional server host name.
  - getFile
```
public byte[] getFile()
```
    Returns:
    
    boot file name.
  - getOptions
```
public byte[] getOptions()
```
    Returns:
    
    a byte array containing options
  - getPort
```
public int getPort()
```
    Returns:
    
    An interger representation of the message destination port
  - getDestinationAddress
```
public String getDestinationAddress()
```
    Get message destination hostname
    
    Returns:
    
    A string representing the hostname of the message destination server
  - setOption
```
public void setOption(int inOptNum,
                      byte[] inOptionData)
```
    Sets DHCP options in DHCPMessage. If option already exists then remove old option and insert a new one.
    
    Parameters:
    
    inOptNum - option number
    
    inOptionData - option data
  - getOption
```
public byte[] getOption(int inOptNum)
```
    Returns specified DHCP option that matches the input code. Null is returned if option is not set.
    
    Parameters:
    
    inOptNum - option number
    
    Returns:
    
    the option matching input code
  - removeOption
```
public void removeOption(int inOptNum)
```
    Removes the specified DHCP option that matches the input code.
    
    Parameters:
    
    inOptNum - option number
  - IsOptSet
```
public boolean IsOptSet(int inOptNum)
```
    Report whether or not the input option is set.
    
    Parameters:
    
    inOptNum - option number
    
    Returns:
    
    is the given option set?

Class DHCPMessage

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

OP_REQUEST

OP_REPLY

DHCPDISCOVER

DHCPOFFER

DHCPREQUEST

DHCPDECLINE

DHCPACK

DHCPNAK

DHCPRELEASE

DHCPINFORM

CLIENT_PORT

SERVER_PORT

BROADCAST_ADDR

Constructor Detail

DHCPMessage

DHCPMessage

DHCPMessage

DHCPMessage

DHCPMessage

DHCPMessage

DHCPMessage

DHCPMessage

DHCPMessage

DHCPMessage

DHCPMessage

DHCPMessage

Method Detail

externalize

internalize

setOp

setHtype

setHlen

setHops

setXid

setSecs

setFlags

setCiaddr

setYiaddr

setSiaddr

setGiaddr

setChaddr

setSname

setFile

setPort

setDestinationHost

getOp

getHtype

getHlen

getHops

getXid

getSecs

getFlags

getCiaddr

getYiaddr

getSiaddr

getGiaddr

getChaddr

getSname

getFile

getOptions

getPort

getDestinationAddress

setOption

getOption

removeOption

IsOptSet