Package io.netty.util.internal

Class MacAddressUtil

java.lang.Object

io.netty.util.internal.MacAddressUtil

public final class MacAddressUtil
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
private static final int	EUI48_MAC_ADDRESS_LENGTH
private static final int	EUI64_MAC_ADDRESS_LENGTH
private static final InternalLogger	logger

Constructor Summary

Constructors

Modifier	Constructor	Description
private	MacAddressUtil()

Method Summary

Modifier and Type	Method	Description
static byte[]	bestAvailableMac()	Obtains the best MAC address found on local network interfaces.
(package private) static int	compareAddresses(byte[] current, byte[] candidate)
private static int	compareAddresses(InetAddress current, InetAddress candidate)
static byte[]	defaultMachineId()	Returns the result of bestAvailableMac() if non-null otherwise returns a random EUI-64 MAC address.
static String	formatAddress(byte[] addr)
static byte[]	parseMAC(String value)	Parse a EUI-48, MAC-48, or EUI-64 MAC address from a String and return it as a byte[].
private static int	scoreAddress(InetAddress addr)
private static void	validateMacSeparator(char separator)

Methods inherited from class java.lang.Object

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

Field Details

logger

private static final InternalLogger logger

EUI64_MAC_ADDRESS_LENGTH

private static final int EUI64_MAC_ADDRESS_LENGTH

See Also:

• Constant Field Values

EUI48_MAC_ADDRESS_LENGTH

private static final int EUI48_MAC_ADDRESS_LENGTH

See Also:

• Constant Field Values

Constructor Details

MacAddressUtil

private MacAddressUtil()

Method Details

bestAvailableMac

public static byte[] bestAvailableMac()

Obtains the best MAC address found on local network interfaces. Generally speaking, an active network interface used on public networks is better than a local network interface.

Returns:

byte array containing a MAC. null if no MAC can be found.

defaultMachineId

public static byte[] defaultMachineId()

Returns the result of bestAvailableMac() if non-null otherwise returns a random EUI-64 MAC address.

parseMAC

public static byte[] parseMAC(String value)

Parse a EUI-48, MAC-48, or EUI-64 MAC address from a String and return it as a byte[].

Parameters:

value - The string representation of the MAC address.

Returns:

The byte representation of the MAC address.

validateMacSeparator

private static void validateMacSeparator(char separator)

formatAddress

public static String formatAddress(byte[] addr)

Parameters:

addr - byte array of a MAC address.

Returns:

hex formatted MAC address.

compareAddresses

static int compareAddresses(byte[] current,
 byte[] candidate)

Returns:

positive - current is better, 0 - cannot tell from MAC addr, negative - candidate is better.

compareAddresses

private static int compareAddresses(InetAddress current,
 InetAddress candidate)

Returns:

positive - current is better, 0 - cannot tell, negative - candidate is better

scoreAddress

private static int scoreAddress(InetAddress addr)