transferred from trunk/Generation3 of lidgren-network

Lidgren.Network/NetUtility.cs

@@ -0,0 +1,262 @@
+/* Copyright (c) 2010 Michael Lidgren
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+and associated documentation files (the "Software"), to deal in the Software without
+restriction, including without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom
+the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or
+substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+*/
+using System;
+using System.Net;
+using System.Net.NetworkInformation;
+using System.Net.Sockets;
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace Lidgren.Network
+{
+	/// <summary>
+	/// Utility methods
+	/// </summary>
+	public static class NetUtility
+	{
+		private static Regex s_regIP;
+
+		/// <summary>
+		/// Get IP address from notation (xxx.xxx.xxx.xxx) or hostname
+		/// </summary>
+		public static IPAddress Resolve(string ipOrHost)
+		{
+			if (string.IsNullOrEmpty(ipOrHost))
+				throw new ArgumentException("Supplied string must not be empty", "ipOrHost");
+
+			ipOrHost = ipOrHost.Trim();
+
+			if (s_regIP == null)
+			{
+				string expression = "\\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\b";
+				RegexOptions options = RegexOptions.Compiled;
+				s_regIP = new Regex(expression, options);
+			}
+
+			// is it an ip number string?
+			IPAddress ipAddress = null;
+			if (s_regIP.Match(ipOrHost).Success && IPAddress.TryParse(ipOrHost, out ipAddress))
+				return ipAddress;
+
+			// ok must be a host name
+			IPHostEntry entry;
+			try
+			{
+				entry = Dns.GetHostEntry(ipOrHost);
+				if (entry == null)
+					return null;
+
+				// check each entry for a valid IP address
+				foreach (IPAddress ipCurrent in entry.AddressList)
+				{
+					string sIP = ipCurrent.ToString();
+					bool isIP = s_regIP.Match(sIP).Success && IPAddress.TryParse(sIP, out ipAddress);
+					if (isIP)
+						break;
+				}
+				if (ipAddress == null)
+					return null;
+
+				return ipAddress;
+			}
+			catch (SocketException ex)
+			{
+				if (ex.SocketErrorCode == SocketError.HostNotFound)
+				{
+					//LogWrite(string.Format(CultureInfo.InvariantCulture, "Failed to resolve host '{0}'.", ipOrHost));
+					return null;
+				}
+				else
+				{
+					throw;
+				}
+			}
+		}
+
+		private static NetworkInterface GetNetworkInterface()
+		{
+			IPGlobalProperties computerProperties = IPGlobalProperties.GetIPGlobalProperties();
+			if (computerProperties == null)
+				return null;
+
+			NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();
+			if (nics == null || nics.Length < 1)
+				return null;
+
+			NetworkInterface best = null;
+			foreach (NetworkInterface adapter in nics)
+			{
+				if (adapter.NetworkInterfaceType == NetworkInterfaceType.Loopback || adapter.NetworkInterfaceType == NetworkInterfaceType.Unknown)
+					continue;
+				if (!adapter.Supports(NetworkInterfaceComponent.IPv4))
+					continue;
+				if (best == null)
+					best = adapter;
+				if (adapter.OperationalStatus != OperationalStatus.Up)
+					continue;
+
+				// A computer could have several adapters (more than one network card)
+				// here but just return the first one for now...
+				return adapter;
+			}
+			return best;
+		}
+
+		public static PhysicalAddress GetMacAddress()
+		{
+			NetworkInterface ni = GetNetworkInterface();
+			if (ni == null)
+				return null;
+			return ni.GetPhysicalAddress();
+		}
+
+		public static string ToHexString(long data)
+		{
+			return ToHexString(BitConverter.GetBytes(data));
+		}
+
+		public static string ToHexString(byte[] data)
+		{
+			StringBuilder sb = new StringBuilder(data.Length * 2);
+			foreach (byte b in data)
+			{
+				sb.AppendFormat("{0:X2}", b);
+			}
+			return sb.ToString();
+		}
+
+		/// <summary>
+		/// Gets my local IP address (not necessarily external) and subnet mask
+		/// </summary>
+		public static IPAddress GetMyAddress(out IPAddress mask)
+		{
+			NetworkInterface ni = GetNetworkInterface();
+			if (ni == null)
+			{
+				mask = null;
+				return null;
+			}
+
+			IPInterfaceProperties properties = ni.GetIPProperties();
+			foreach (UnicastIPAddressInformation unicastAddress in properties.UnicastAddresses)
+			{
+				if (unicastAddress != null && unicastAddress.Address != null && unicastAddress.Address.AddressFamily == AddressFamily.InterNetwork)
+				{
+					mask = unicastAddress.IPv4Mask;
+					return unicastAddress.Address;
+				}
+			}
+
+			mask = null;
+			return null;
+		}
+
+		/// <summary>
+		/// Returns true if the IPEndPoint supplied is on the same subnet as this host
+		/// </summary>
+		public static bool IsLocal(IPEndPoint endpoint)
+		{
+			if (endpoint == null)
+				return false;
+			return IsLocal(endpoint.Address);
+		}
+
+		/// <summary>
+		/// Returns true if the IPAddress supplied is on the same subnet as this host
+		/// </summary>
+		public static bool IsLocal(IPAddress remote)
+		{
+			IPAddress mask;
+			IPAddress local = GetMyAddress(out mask);
+
+			if (mask == null)
+				return false;
+
+			uint maskBits = BitConverter.ToUInt32(mask.GetAddressBytes(), 0);
+			uint remoteBits = BitConverter.ToUInt32(remote.GetAddressBytes(), 0);
+			uint localBits = BitConverter.ToUInt32(local.GetAddressBytes(), 0);
+
+			// compare network portions
+			return ((remoteBits & maskBits) == (localBits & maskBits));
+		}
+
+		/// <summary>
+		/// Returns how many bits are necessary to hold a certain number
+		/// </summary>
+		[CLSCompliant(false)]
+		public static int BitsToHoldUInt(uint value)
+		{
+			int bits = 1;
+			while ((value >>= 1) != 0)
+				bits++;
+			return bits;
+		}
+
+		/// <summary>
+		/// Returns how many bytes are required to hold a certain number of bits
+		/// </summary>
+		public static int BytesToHoldBits(int numBits)
+		{
+			return (numBits + 7) / 8;
+		}
+
+		[CLSCompliant(false)]
+		public static UInt32 SwapByteOrder(UInt32 value)
+		{
+			return
+				((value & 0xff000000) >> 24) |
+				((value & 0x00ff0000) >> 8) |
+				((value & 0x0000ff00) << 8) |
+				((value & 0x000000ff) << 24);
+		}
+
+		[CLSCompliant(false)]
+		public static UInt64 SwapByteOrder(UInt64 value)
+		{
+			return
+				((value & 0xff00000000000000L) >> 56) |
+				((value & 0x00ff000000000000L) >> 40) |
+				((value & 0x0000ff0000000000L) >> 24) |
+				((value & 0x000000ff00000000L) >> 8) |
+				((value & 0x00000000ff000000L) << 8) |
+				((value & 0x0000000000ff0000L) << 24) |
+				((value & 0x000000000000ff00L) << 40) |
+				((value & 0x00000000000000ffL) << 56);
+		}
+
+		public static bool CompareElements(byte[] one, byte[] two)
+		{
+			if (one.Length != two.Length)
+				return false;
+			for (int i = 0; i < one.Length; i++)
+				if (one[i] != two[i])
+					return false;
+			return true;
+		}
+
+		public static byte[] ToByteArray(String hexString)
+		{
+			byte[] retval = new byte[hexString.Length / 2];
+			for (int i = 0; i < hexString.Length; i += 2)
+				retval[i / 2] = Convert.ToByte(hexString.Substring(i, 2), 16);
+			return retval;
+		}
+	}
+}