Initial Commit

iTechSharp/srcbc/util/net/IPAddress.cs

@@ -0,0 +1,112 @@
+using System;
+
+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 address.
+		* 
+		* @param address the IP address as a string.
+		*
+		* @return true if a valid IPv4 address, false otherwise
+		*/
+		private static bool IsValidIPv4(
+			string address)
+		{
+			if (address.Length == 0)
+				return false;
+
+			BigInteger 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 = new BigInteger(temp.Substring(start, pos - start));
+				}
+				catch (FormatException)
+				{
+					return false;
+				}
+
+				if (octet.SignValue < 0 || octet.BitLength > 8)
+					return false;
+
+				start = pos + 1;
+				++octets;
+			}
+
+			return octets == 4;
+		}
+
+		/**
+		* Validate the given IPv6 address.
+		*
+		* @param address the IP address as a string.
+		*
+		* @return true if a valid IPv4 address, false otherwise
+		*/
+		private static bool IsValidIPv6(
+			string address)
+		{
+			if (address.Length == 0)
+				return false;
+
+			BigInteger octet;
+			int octets = 0;
+
+			string temp = address + ":";
+
+			int pos;
+			int start = 0;
+			while (start < temp.Length
+				&& (pos = temp.IndexOf(':', start)) > start)
+			{
+				if (octets == 8)
+					return false;
+
+				try
+				{
+					octet = new BigInteger(temp.Substring(start, pos - start), 16);
+				}
+				catch (FormatException)
+				{
+					return false;
+				}
+
+				if (octet.SignValue < 0 || octet.BitLength > 16)
+					return false;
+
+				start = pos + 1;
+				octets++;
+			}
+
+			return octets == 8;
+		}
+	}
+}