11 changed files with 330 additions and 63 deletions
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using System; |
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using System.Collections.Generic; |
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using System.Linq; |
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using System.Net; |
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using System.Net.Sockets; |
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using System.Text; |
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using System.Threading.Tasks; |
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using System.Web; |
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namespace Teknik.Helpers |
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{ |
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public static class RequestHelper |
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{ |
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/// <summary>
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/// method to get Client ip address
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/// </summary>
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/// <param name="GetLan"> set to true if want to get local(LAN) Connected ip address</param>
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/// <returns></returns>
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public static string GetVisitorIPAddress(bool GetLan = false) |
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{ |
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string visitorIPAddress = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]; |
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if (String.IsNullOrEmpty(visitorIPAddress)) |
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visitorIPAddress = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"]; |
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if (string.IsNullOrEmpty(visitorIPAddress)) |
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visitorIPAddress = HttpContext.Current.Request.UserHostAddress; |
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if (string.IsNullOrEmpty(visitorIPAddress) || visitorIPAddress.Trim() == "::1") |
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{ |
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GetLan = true; |
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visitorIPAddress = string.Empty; |
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} |
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if (GetLan) |
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{ |
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if (string.IsNullOrEmpty(visitorIPAddress)) |
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{ |
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//This is for Local(LAN) Connected ID Address
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string stringHostName = Dns.GetHostName(); |
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//Get Ip Host Entry
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IPHostEntry ipHostEntries = Dns.GetHostEntry(stringHostName); |
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//Get Ip Address From The Ip Host Entry Address List
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IPAddress[] arrIpAddress = ipHostEntries.AddressList; |
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try |
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{ |
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visitorIPAddress = arrIpAddress[arrIpAddress.Length - 2].ToString(); |
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} |
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catch |
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{ |
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try |
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{ |
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visitorIPAddress = arrIpAddress[0].ToString(); |
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} |
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catch |
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{ |
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try |
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{ |
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arrIpAddress = Dns.GetHostAddresses(stringHostName); |
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visitorIPAddress = arrIpAddress[0].ToString(); |
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} |
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catch |
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{ |
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visitorIPAddress = "127.0.0.1"; |
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} |
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} |
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} |
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} |
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} |
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return visitorIPAddress; |
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} |
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// based on http://www.grantburton.com/2008/11/30/fix-for-incorrect-ip-addresses-in-wordpress-comments/
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public static string ClientIPFromRequest(this HttpRequestBase request, bool skipPrivate) |
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{ |
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foreach (var item in s_HeaderItems) |
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{ |
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var ipString = request.Headers[item.Key]; |
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if (String.IsNullOrEmpty(ipString)) |
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continue; |
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if (item.Split) |
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{ |
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foreach (var ip in ipString.Split(',')) |
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if (ValidIP(ip, skipPrivate)) |
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return ip; |
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} |
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else |
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{ |
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if (ValidIP(ipString, skipPrivate)) |
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return ipString; |
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} |
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} |
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return request.UserHostAddress; |
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} |
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public static string DumpHeaders(this HttpRequestBase request) |
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{ |
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var headers = string.Empty; |
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foreach (var key in request.Headers.AllKeys) |
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headers += key + "=" + request.Headers[key] + Environment.NewLine; |
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return headers; |
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} |
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public static string DumpServerVariables(this HttpRequestBase request) |
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{ |
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var variables = string.Empty; |
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foreach (var key in request.ServerVariables.AllKeys) |
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variables += key + "=" + request.ServerVariables[key] + Environment.NewLine; |
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return variables; |
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} |
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private static bool ValidIP(string ip, bool skipPrivate) |
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{ |
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IPAddress ipAddr; |
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ip = ip == null ? String.Empty : ip.Trim(); |
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if (0 == ip.Length |
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|| false == IPAddress.TryParse(ip, out ipAddr) |
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|| (ipAddr.AddressFamily != AddressFamily.InterNetwork |
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&& ipAddr.AddressFamily != AddressFamily.InterNetworkV6)) |
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return false; |
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if (skipPrivate && ipAddr.AddressFamily == AddressFamily.InterNetwork) |
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{ |
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var addr = IpRange.AddrToUInt64(ipAddr); |
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foreach (var range in s_PrivateRanges) |
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{ |
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if (range.Encompasses(addr)) |
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return false; |
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} |
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} |
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return true; |
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} |
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/// <summary>
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/// Provides a simple class that understands how to parse and
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/// compare IP addresses (IPV4) ranges.
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/// </summary>
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private sealed class IpRange |
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{ |
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private readonly UInt64 _start; |
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private readonly UInt64 _end; |
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public IpRange(string startStr, string endStr) |
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{ |
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_start = ParseToUInt64(startStr); |
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_end = ParseToUInt64(endStr); |
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} |
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public static UInt64 AddrToUInt64(IPAddress ip) |
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{ |
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var ipBytes = ip.GetAddressBytes(); |
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UInt64 value = 0; |
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foreach (var abyte in ipBytes) |
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{ |
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value <<= 8; // shift
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value += abyte; |
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} |
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return value; |
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} |
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public static UInt64 ParseToUInt64(string ipStr) |
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{ |
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var ip = IPAddress.Parse(ipStr); |
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return AddrToUInt64(ip); |
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} |
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public bool Encompasses(UInt64 addrValue) |
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{ |
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return _start <= addrValue && addrValue <= _end; |
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} |
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public bool Encompasses(IPAddress addr) |
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{ |
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var value = AddrToUInt64(addr); |
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return Encompasses(value); |
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} |
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}; |
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private static readonly IpRange[] s_PrivateRanges = |
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new IpRange[] { |
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new IpRange("0.0.0.0","2.255.255.255"), |
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new IpRange("10.0.0.0","10.255.255.255"), |
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new IpRange("127.0.0.0","127.255.255.255"), |
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new IpRange("169.254.0.0","169.254.255.255"), |
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new IpRange("172.16.0.0","172.31.255.255"), |
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new IpRange("192.0.2.0","192.0.2.255"), |
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new IpRange("192.168.0.0","192.168.255.255"), |
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new IpRange("255.255.255.0","255.255.255.255") |
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}; |
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/// <summary>
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/// Describes a header item (key) and if it is expected to be
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/// a comma-delimited string
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/// </summary>
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private sealed class HeaderItem |
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{ |
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public readonly string Key; |
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public readonly bool Split; |
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public HeaderItem(string key, bool split) |
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{ |
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Key = key; |
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Split = split; |
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} |
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} |
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// order is in trust/use order top to bottom
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private static readonly HeaderItem[] s_HeaderItems = |
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new HeaderItem[] { |
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new HeaderItem("HTTP_CLIENT_IP",false), |
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new HeaderItem("HTTP_X_FORWARDED_FOR",true), |
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new HeaderItem("HTTP_X_FORWARDED",false), |
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new HeaderItem("HTTP_X_CLUSTER_CLIENT_IP",false), |
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new HeaderItem("HTTP_FORWARDED_FOR",false), |
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new HeaderItem("HTTP_FORWARDED",false), |
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new HeaderItem("HTTP_VIA",false), |
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new HeaderItem("REMOTE_ADDR",false) |
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}; |
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} |
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} |
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