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using System;
using System.Globalization;
using Org.BouncyCastle.Math;
namespace Org.BouncyCastle.Utilities.Net
{
public class IPAddress
{
/**
* 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 bool IsValid(
string address)
{
return IsValidIPv4(address) || IsValidIPv6(address);
}
/**
* 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 bool IsValidWithNetMask(
string address)
{
return IsValidIPv4WithNetmask(address) || IsValidIPv6WithNetmask(address);
}
/**
* Validate the given IPv4 address.
*
* @param address the IP address as a string.
*
* @return true if a valid IPv4 address, false otherwise
*/
public static bool IsValidIPv4(
string address)
{
try
{
return unsafeIsValidIPv4(address);
}
catch (FormatException) {}
catch (OverflowException) {}
return false;
}
private static bool unsafeIsValidIPv4(
string address)
{
if (address.Length == 0)
return false;
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;
string octetStr = temp.Substring(start, pos - start);
int octet = Int32.Parse(octetStr);
if (octet < 0 || octet > 255)
return false;
start = pos + 1;
octets++;
}
return octets == 4;
}
public static bool 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 bool 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 bool IsMaskValue(
string component,
int size)
{
int val = Int32.Parse(component);
try
{
return val >= 0 && val <= size;
}
catch (FormatException) {}
catch (OverflowException) {}
return false;
}
/**
* Validate the given IPv6 address.
*
* @param address the IP address as a string.
*
* @return true if a valid IPv4 address, false otherwise
*/
public static bool IsValidIPv6(
string address)
{
try
{
return unsafeIsValidIPv6(address);
}
catch (FormatException) {}
catch (OverflowException) {}
return false;
}
private static bool unsafeIsValidIPv6(
string address)
{
if (address.Length == 0)
{
return false;
}
int octets = 0;
string temp = address + ":";
bool 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 - start);
if (pos == (temp.Length - 1) && value.IndexOf('.') > 0)
{
if (!IsValidIPv4(value))
{
return false;
}
octets++; // add an extra one as address covers 2 words.
}
else
{
string octetStr = temp.Substring(start, pos - start);
int octet = Int32.Parse(octetStr, NumberStyles.AllowHexSpecifier);
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;
}
}
}
|
