Package org.opendaylight.openflowplugin.libraries.liblldp

Class NetUtils

java.lang.Object
org.opendaylight.openflowplugin.libraries.liblldp.NetUtils
public abstract class NetUtils extends Object
Utility class containing the common utility functions needed for operating on networking data structures.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final int
    MAC_ADDR_LENGTH_IN_BYTES
    Constant holding the number of bytes in MAC Address.
    static final int
    MAC_ADDR_LENGTH_IN_WORDS
    Constant holding the number of words in MAC Address.
    static final int
    NUM_BITS_IN_A_BYTE
    Constant holding the number of bits in a byte.

  • Constructor Summary

    Constructors
    Constructor
    Description
    NetUtils()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static int
    byteArray4ToInt(byte[] ba)
    Converts a 4 bytes array into an integer number.
    static long
    byteArray6ToLong(byte[] ba)
    Converts a 6 bytes array into a long number MAC addresses.
    static boolean
    fieldsConflict(int field1, int field2)
     
    static byte[]
    getBroadcastMACAddr()
    Returns Broadcast MAC Address.
    static InetAddress
    gethighestIP(boolean v6)
    Returns the highest v4 or v6 InetAddress.
    static InetAddress
    getInetAddress(int address)
    Converts an IP address passed as integer value into the respective InetAddress object.
    static InetAddress
    getInetNetworkMask(int prefixMaskLength, boolean isV6)
    Return the InetAddress Network Mask given the length of the prefix bit mask.
    static int
    getSubnetMaskLength(byte[] subnetMask)
    Returns the prefix size in bits of the specified subnet mask.
    static int
    getSubnetMaskLength(InetAddress subnetMask)
    Returns the prefix size in bits of the specified subnet mask.
    static InetAddress
    getSubnetPrefix(InetAddress ip, int maskLen)
    Given an IP address and a prefix network mask length, it returns the equivalent subnet prefix IP address Example: for ip = "172.28.30.254" and maskLen = 25 it will return "172.28.30.128".
    static int
    getUnsignedByte(byte value)
    Returns the unsigned value of the passed byte variable.
    static int
    getUnsignedShort(short value)
    Return the unsigned value of the passed short variable.
    static boolean
    inetAddressConflict(InetAddress testAddress, InetAddress filterAddress, InetAddress testMask, InetAddress filterMask)
    Checks if the test address and mask conflicts with the filter address and mask.
    static byte[]
    intToByteArray4(int number)
    Converts an integer number into a 4 bytes array.
    static boolean
    isAny(InetAddress ip)
    Returns true if the passed InetAddress contains all zero.
    static boolean
    isBroadcastMACAddr(byte[] macAddress)
    Returns true if the MAC address is the broadcast MAC address and false otherwise.
    static boolean
    isIPAddressValid(String cidr)
    Checks if the passed IP address in string form is a valid v4 or v6 address.
    static boolean
    isIPv4AddressValid(String cidr)
    Checks if the passed IP v4 address in string form is valid The address may specify a mask at the end as "/MM".
    static boolean
    isIPv6AddressValid(String cidr)
    Checks if the passed IP v6 address in string form is valid The address may specify a mask at the end as "/MMM".
    static boolean
    isMulticastMACAddr(byte[] macAddress)
    Returns true if the MAC address is a multicast MAC address and false otherwise.
    static boolean
    isUnicastMACAddr(byte[] macAddress)
    Returns true if the MAC address is a unicast MAC address and false otherwise.
    static boolean
    isZeroMAC(byte[] mac)
    Returns true if the passed MAC address is all zero.
    static byte[]
    longToByteArray6(long addr)
    Converts a long number to a 6 bytes array for MAC addresses.
    static InetAddress
    parseInetAddress(String addressString)
     

    Methods inherited from class java.lang.Object

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

  • Field Details

    • NUM_BITS_IN_A_BYTE

      public static final int NUM_BITS_IN_A_BYTE
      Constant holding the number of bits in a byte.
      See Also:

    • MAC_ADDR_LENGTH_IN_BYTES

      public static final int MAC_ADDR_LENGTH_IN_BYTES
      Constant holding the number of bytes in MAC Address.
      See Also:

    • MAC_ADDR_LENGTH_IN_WORDS

      public static final int MAC_ADDR_LENGTH_IN_WORDS
      Constant holding the number of words in MAC Address.
      See Also:

  • Constructor Details

    • NetUtils

      public NetUtils()

  • Method Details

    • byteArray4ToInt

      public static int byteArray4ToInt(byte[] ba)
      Converts a 4 bytes array into an integer number.
      Parameters:
      ba - the 4 bytes long byte array
      Returns:
      the integer number

    • byteArray6ToLong

      public static long byteArray6ToLong(byte[] ba)
      Converts a 6 bytes array into a long number MAC addresses.
      Parameters:
      ba - The 6 bytes long byte array.
      Returns:
      The long number. Zero is returned if ba is null or the length of it is not six.

    • longToByteArray6

      public static byte[] longToByteArray6(long addr)
      Converts a long number to a 6 bytes array for MAC addresses.
      Parameters:
      addr - The long number.
      Returns:
      The byte array.

    • intToByteArray4

      public static byte[] intToByteArray4(int number)
      Converts an integer number into a 4 bytes array.
      Parameters:
      number - the integer number
      Returns:
      the byte array

    • getInetAddress

      public static InetAddress getInetAddress(int address)
      Converts an IP address passed as integer value into the respective InetAddress object.
      Parameters:
      address - the IP address in integer form
      Returns:
      the IP address in InetAddress form

    • getInetNetworkMask

      public static InetAddress getInetNetworkMask(int prefixMaskLength, boolean isV6)
      Return the InetAddress Network Mask given the length of the prefix bit mask. The prefix bit mask indicates the contiguous leading bits that are NOT masked out. Example: A prefix bit mask length of 8 will give an InetAddress Network Mask of 255.0.0.0
      Parameters:
      prefixMaskLength - integer representing the length of the prefix network mask
      isV6 - boolean representing the IP version of the returned address

    • getSubnetMaskLength

      public static int getSubnetMaskLength(byte[] subnetMask)
      Returns the prefix size in bits of the specified subnet mask. Example: For the subnet mask ff.ff.ff.e0 it returns 25 while for ff.00.00.00 it returns 8. If the passed subnetMask array is null, 0 is returned.
      Parameters:
      subnetMask - the subnet mask as byte array
      Returns:
      the prefix length as number of bits

    • getSubnetMaskLength

      public static int getSubnetMaskLength(InetAddress subnetMask)
      Returns the prefix size in bits of the specified subnet mask. Example: For the subnet mask 255.255.255.128 it returns 25 while for 255.0.0.0 it returns 8. If the passed subnetMask object is null, 0 is returned
      Parameters:
      subnetMask - the subnet mask as InetAddress
      Returns:
      the prefix length as number of bits

    • getSubnetPrefix

      public static InetAddress getSubnetPrefix(InetAddress ip, int maskLen)
      Given an IP address and a prefix network mask length, it returns the equivalent subnet prefix IP address Example: for ip = "172.28.30.254" and maskLen = 25 it will return "172.28.30.128".
      Parameters:
      ip - the IP address in InetAddress form
      maskLen - the length of the prefix network mask
      Returns:
      the subnet prefix IP address in InetAddress form

    • inetAddressConflict

      public static boolean inetAddressConflict(InetAddress testAddress, InetAddress filterAddress, InetAddress testMask, InetAddress filterMask)
      Checks if the test address and mask conflicts with the filter address and mask. For example:

      testAddress: 172.28.2.23 testMask: 255.255.255.0 filterAddress: 172.28.1.10 testMask: 255.255.255.0 do conflict

      testAddress: 172.28.2.23 testMask: 255.255.255.0 filterAddress: 172.28.1.10 testMask: 255.255.0.0 do not conflict

      Null parameters are permitted.

    • isZeroMAC

      public static boolean isZeroMAC(byte[] mac)
      Returns true if the passed MAC address is all zero.
      Parameters:
      mac - the byte array representing the MAC address
      Returns:
      true if all MAC bytes are zero

    • isBroadcastMACAddr

      public static boolean isBroadcastMACAddr(byte[] macAddress)
      Returns true if the MAC address is the broadcast MAC address and false otherwise.

    • isUnicastMACAddr

      public static boolean isUnicastMACAddr(byte[] macAddress)
      Returns true if the MAC address is a unicast MAC address and false otherwise.

    • isMulticastMACAddr

      public static boolean isMulticastMACAddr(byte[] macAddress)
      Returns true if the MAC address is a multicast MAC address and false otherwise. Note that this explicitly returns false for the broadcast MAC address.

    • isAny

      public static boolean isAny(InetAddress ip)
      Returns true if the passed InetAddress contains all zero.
      Parameters:
      ip - the IP address to test
      Returns:
      true if the address is all zero

    • fieldsConflict

      public static boolean fieldsConflict(int field1, int field2)

    • parseInetAddress

      public static InetAddress parseInetAddress(String addressString)

    • isIPv4AddressValid

      public static boolean isIPv4AddressValid(String cidr)
      Checks if the passed IP v4 address in string form is valid The address may specify a mask at the end as "/MM".
      Parameters:
      cidr - the v4 address as A.B.C.D/MM

    • isIPv6AddressValid

      public static boolean isIPv6AddressValid(String cidr)
      Checks if the passed IP v6 address in string form is valid The address may specify a mask at the end as "/MMM".
      Parameters:
      cidr - the v6 address as A::1/MMM

    • isIPAddressValid

      public static boolean isIPAddressValid(String cidr)
      Checks if the passed IP address in string form is a valid v4 or v6 address. The address may specify a mask at the end as "/MMM"
      Parameters:
      cidr - the v4 or v6 address as IP/MMM

    • getUnsignedByte

      public static int getUnsignedByte(byte value)
      Returns the unsigned value of the passed byte variable.
      Parameters:
      value - the byte value
      Returns:
      the int variable containing the unsigned byte value

    • getUnsignedShort

      public static int getUnsignedShort(short value)
      Return the unsigned value of the passed short variable.
      Parameters:
      value - the short value
      Returns:
      the int variable containing the unsigned short value

    • gethighestIP

      public static InetAddress gethighestIP(boolean v6)
      Returns the highest v4 or v6 InetAddress.
      Parameters:
      v6 - true for IPv6, false for Ipv4
      Returns:
      The highest IPv4 or IPv6 address

    • getBroadcastMACAddr

      public static byte[] getBroadcastMACAddr()
      Returns Broadcast MAC Address.
      Returns:
      the byte array containing broadcast mac address