package org.bouncycastle.util;

Utility methods for processing String objects containing IP addresses.
/** * Utility methods for processing String objects containing IP addresses. */
public class IPAddress {
Validate the given IPv4 or IPv6 address.
Params:
  • address – the IP address as a String.
Returns:true if a valid address, false otherwise
/** * Validate the given IPv4 or IPv6 address. * * @param address the IP address as a String. * * @return true if a valid address, false otherwise */
public static boolean isValid( String address) { return isValidIPv4(address) || isValidIPv6(address); }
Validate the given IPv4 or IPv6 address and netmask.
Params:
  • address – the IP address as a String.
Returns:true if a valid address with netmask, false otherwise
/** * Validate the given IPv4 or IPv6 address and netmask. * * @param address the IP address as a String. * * @return true if a valid address with netmask, false otherwise */
public static boolean isValidWithNetMask( String address) { return isValidIPv4WithNetmask(address) || isValidIPv6WithNetmask(address); }
Validate the given IPv4 address.
Params:
  • address – the IP address as a String.
Returns:true if a valid IPv4 address, false otherwise
/** * Validate the given IPv4 address. * * @param address the IP address as a String. * * @return true if a valid IPv4 address, false otherwise */
public static boolean isValidIPv4( String address) { if (address.length() == 0) { return false; } int octet; int octets = 0; String temp = address+"."; int pos; int start = 0; while (start < temp.length() && (pos = temp.indexOf('.', start)) > start) { if (octets == 4) { return false; } try { octet = Integer.parseInt(temp.substring(start, pos)); } catch (NumberFormatException ex) { return false; } if (octet < 0 || octet > 255) { return false; } start = pos + 1; octets++; } return octets == 4; } public static boolean isValidIPv4WithNetmask( String address) { int index = address.indexOf("/"); String mask = address.substring(index + 1); return (index > 0) && isValidIPv4(address.substring(0, index)) && (isValidIPv4(mask) || isMaskValue(mask, 32)); } public static boolean isValidIPv6WithNetmask( String address) { int index = address.indexOf("/"); String mask = address.substring(index + 1); return (index > 0) && (isValidIPv6(address.substring(0, index)) && (isValidIPv6(mask) || isMaskValue(mask, 128))); } private static boolean isMaskValue(String component, int size) { try { int value = Integer.parseInt(component); return value >= 0 && value <= size; } catch (NumberFormatException e) { return false; } }
Validate the given IPv6 address.
Params:
  • address – the IP address as a String.
Returns:true if a valid IPv6 address, false otherwise
/** * Validate the given IPv6 address. * * @param address the IP address as a String. * * @return true if a valid IPv6 address, false otherwise */
public static boolean isValidIPv6( String address) { if (address.length() == 0) { return false; } int octet; int octets = 0; String temp = address + ":"; boolean doubleColonFound = false; int pos; int start = 0; while (start < temp.length() && (pos = temp.indexOf(':', start)) >= start) { if (octets == 8) { return false; } if (start != pos) { String value = temp.substring(start, pos); if (pos == (temp.length() - 1) && value.indexOf('.') > 0) { if (!isValidIPv4(value)) { return false; } octets++; // add an extra one as address covers 2 words. } else { try { octet = Integer.parseInt(temp.substring(start, pos), 16); } catch (NumberFormatException ex) { return false; } if (octet < 0 || octet > 0xffff) { return false; } } } else { if (pos != 1 && pos != temp.length() - 1 && doubleColonFound) { return false; } doubleColonFound = true; } start = pos + 1; octets++; } return octets == 8 || doubleColonFound; } }