Package eu.emi.security.authn.x509.helpers.proxy

Class IPAddressHelper

java.lang.Object

eu.emi.security.authn.x509.helpers.proxy.IPAddressHelper

public class IPAddressHelper
extends java.lang.Object

Helpers for IP addresses comparison. Mostly the code from Tigran's ipmatcher library (GNU license).

Field Summary

Fields

Modifier and Type	Field	Description
private static int	IPv4_FULL_MASK
private static int	IPv6_FULL_MASK
private static int	IPv6_HALF_MASK

Constructor Summary

Constructors

Constructor	Description
IPAddressHelper()

Method Summary

Modifier and Type	Method	Description
private static int	getCidrNetmask(int size, byte[] netmask, int offset)
private static int	getInt(byte[] bytes, int offset)	Returns the big-endian int value whose byte representation is the 4 bytes of bytes staring offset.
private static long	getLong(byte[] bytes, int offset)	Returns the big-endian long value whose byte representation is the 8 bytes of bytes staring offset.
static boolean	isWithinAddressSpace(byte[] ipBytes, byte[] ipAddressWithNetmask)	Tests whether the ipAddress is within the address space defined by the ipAddressWithNetmask.

Methods inherited from class java.lang.Object

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

Field Detail

IPv4_FULL_MASK

private static final int IPv4_FULL_MASK

See Also:

Constant Field Values

IPv6_FULL_MASK

private static final int IPv6_FULL_MASK

See Also:

Constant Field Values

IPv6_HALF_MASK

private static final int IPv6_HALF_MASK

See Also:

Constant Field Values

Constructor Detail

IPAddressHelper

public IPAddressHelper()

Method Detail

isWithinAddressSpace

public static boolean isWithinAddressSpace(byte[] ipBytes,
                                           byte[] ipAddressWithNetmask)

Tests whether the ipAddress is within the address space defined by the ipAddressWithNetmask.

Parameters:

ipBytes - The IP address bytes to compare against the address space.

ipAddressWithNetmask - The 8 (IPv4) or 32 (IPv6) byte array containing in the first half the base IP address bytes and in the second half the netmask bytes.

Returns:

true if ip matches subnet.

getLong

private static long getLong(byte[] bytes,
                            int offset)

Returns the big-endian long value whose byte representation is the 8 bytes of bytes staring offset.

Parameters:

bytes -

offset -

Returns:

long value

getInt

private static int getInt(byte[] bytes,
                          int offset)

Returns the big-endian int value whose byte representation is the 4 bytes of bytes staring offset.

Parameters:

bytes -

offset -

Returns:

int value

getCidrNetmask

private static int getCidrNetmask(int size,
                                  byte[] netmask,
                                  int offset)