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Keivan 2010-10-02 12:01:43 -07:00
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CassiniDev/Misc/NetworkUtils.cs Normal file
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// **********************************************************************************
// CassiniDev - http://cassinidev.codeplex.com
//
// Copyright (c) 2010 Sky Sanders. All rights reserved.
//
// This source code is subject to terms and conditions of the Microsoft Public
// License (Ms-PL). A copy of the license can be found in the license.txt file
// included in this distribution.
//
// You must not remove this notice, or any other, from this software.
//
// **********************************************************************************
#region
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.NetworkInformation;
using System.Text.RegularExpressions;
using System.Threading;
#endregion
namespace CassiniDev
{
public static class CassiniNetworkUtils
{
public static IPAddress[] GetLocalAddresses()
{
string strHostName = Dns.GetHostName();
IPHostEntry ipEntry = Dns.GetHostEntry(strHostName);
return ipEntry.AddressList;
}
/// <summary>
/// Returns first available port on the specified IP address.
/// The port scan excludes ports that are open on ANY loopback adapter.
///
/// If the address upon which a port is requested is an 'ANY' address all
/// ports that are open on ANY IP are excluded.
/// </summary>
/// <param name="rangeStart"></param>
/// <param name="rangeEnd"></param>
/// <param name="ip">The IP address upon which to search for available port.</param>
/// <param name="includeIdlePorts">If true includes ports in TIME_WAIT state in results.
/// TIME_WAIT state is typically cool down period for recently released ports.</param>
/// <returns></returns>
public static int GetAvailablePort(int rangeStart, int rangeEnd, IPAddress ip, bool includeIdlePorts)
{
IPGlobalProperties ipProps = IPGlobalProperties.GetIPGlobalProperties();
// if the ip we want a port on is an 'any' or loopback port we need to exclude all ports that are active on any IP
Func<IPAddress, bool> isIpAnyOrLoopBack = i => IPAddress.Any.Equals(i) ||
IPAddress.IPv6Any.Equals(i) ||
IPAddress.Loopback.Equals(i) ||
IPAddress.IPv6Loopback.
Equals(i);
// get all active ports on specified IP.
List<ushort> excludedPorts = new List<ushort>();
// if a port is open on an 'any' or 'loopback' interface then include it in the excludedPorts
excludedPorts.AddRange(from n in ipProps.GetActiveTcpConnections()
where
n.LocalEndPoint.Port >= rangeStart &&
n.LocalEndPoint.Port <= rangeEnd && (
isIpAnyOrLoopBack(ip) ||
n.LocalEndPoint.Address.Equals(ip) ||
isIpAnyOrLoopBack(n.LocalEndPoint.Address)) &&
(!includeIdlePorts || n.State != TcpState.TimeWait)
select (ushort) n.LocalEndPoint.Port);
excludedPorts.AddRange(from n in ipProps.GetActiveTcpListeners()
where n.Port >= rangeStart && n.Port <= rangeEnd && (
isIpAnyOrLoopBack(ip) ||
n.Address.Equals(ip) ||
isIpAnyOrLoopBack(n.Address))
select (ushort) n.Port);
excludedPorts.AddRange(from n in ipProps.GetActiveUdpListeners()
where n.Port >= rangeStart && n.Port <= rangeEnd && (
isIpAnyOrLoopBack(ip) ||
n.Address.Equals(ip) ||
isIpAnyOrLoopBack(n.Address))
select (ushort) n.Port);
excludedPorts.Sort();
for (int port = rangeStart; port <= rangeEnd; port++)
{
if (!excludedPorts.Contains((ushort) port))
{
return port;
}
}
return 0;
}
///<summary>
/// Returns the first IPV4 address available for this host.
/// This is typically an external IP
///</summary>
///<returns></returns>
public static IPAddress GetExternalIPV4()
{
return GetIPAdresses().ToList()
.FirstOrDefault(i => i.ToString().IndexOf(":") == -1);
}
///<summary>
///</summary>
///<returns></returns>
public static string GetHostName()
{
return Dns.GetHostName();
}
///<summary>
/// Gets all IP addresses for this host
///</summary>
public static IPAddress[] GetIPAdresses()
{
return Dns.GetHostEntry(GetHostName()).AddressList;
}
/// <summary>
/// Gently polls specified IP:Port to determine if it is available.
/// </summary>
/// <param name="ipAddress"></param>
/// <param name="port"></param>
public static bool IsPortAvailable(IPAddress ipAddress, int port)
{
bool portAvailable = false;
for (int i = 0; i < 5; i++)
{
portAvailable = GetAvailablePort(port, port, ipAddress, true) == port;
if (portAvailable)
{
break;
}
// be a little patient and wait for the port if necessary,
// the previous occupant may have just vacated
Thread.Sleep(100);
}
return portAvailable;
}
/// <summary>
/// Combine the RootUrl of the running web application with the relative url
/// specified.
/// </summary>
/// <param name="rootUrl"></param>
/// <param name="relativeUrl"></param>
/// <returns></returns>
public static string NormalizeUrl(string rootUrl, string relativeUrl)
{
relativeUrl = relativeUrl.TrimStart(new[] {'/'});
if (!rootUrl.EndsWith("/"))
{
rootUrl += "/";
}
return new Uri(rootUrl + relativeUrl).ToString();
}
///<summary>
///</summary>
///<param name="ipString"></param>
///<returns></returns>
public static IPAddress ParseIPString(string ipString)
{
if (string.IsNullOrEmpty(ipString))
{
ipString = "loopback";
}
ipString = ipString.Trim().ToLower();
switch (ipString)
{
case "any":
return IPAddress.Any;
case "loopback":
return IPAddress.Loopback;
case "ipv6any":
return IPAddress.IPv6Any;
case "ipv6loopback":
return IPAddress.IPv6Loopback;
default:
IPAddress result;
IPAddress.TryParse(ipString, out result);
return result;
}
}
/// <summary>
/// <para>
/// Hostnames are composed of series of labels concatenated with dots, as are all domain names[1].
/// For example, "en.wikipedia.org" is a hostname. Each label must be between 1 and 63 characters long,
/// and the entire hostname has a maximum of 255 characters.</para>
/// <para>
/// The Internet standards (Request for Comments) for protocols mandate that component hostname
/// labels may contain only the ASCII letters 'a' through 'z' (in a case-insensitive manner), the digits
/// '0' through '9', and the hyphen. The original specification of hostnames in RFC 952, mandated that
/// labels could not start with a digit or with a hyphen, and must not end with a hyphen. However, a
/// subsequent specification (RFC 1123) permitted hostname labels to start with digits. No other symbols,
/// punctuation characters, or blank spaces are permitted.</para>
/// </summary>
/// <param name="hostname"></param>
/// <returns></returns>
/// http://en.wikipedia.org/wiki/Hostname#Restrictions_on_valid_host_names
public static bool ValidateHostName(string hostname)
{
Regex hostnameRx =
new Regex(
@"^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z]|[A-Za-z][A-Za-z0-9\-]*[A-Za-z0-9])$");
return hostnameRx.IsMatch(hostname);
}
}
}