//webconfig
//定义允许的IP端，格式如 :static string[] IPRange= { "0.0.0.0-0.0.0.0", "0.0.0.0-0.0.0.0", "192.168.0.0-192.168.255.255" }; //主函数，调用判断接口 static void Main() { //判断192.168.100.0这个ip是否在指定的IP范围段内 string ip = GetIP();
string IPRange = System.Configuration.ConfigurationManager.AppSettings["IPRange"].ToString(); if (IPRange != "startIP-endIP") { bool power = false; if (IPRange.IndexOf(',') > 0) { string[] AllowIPRanges = IPRange.Split(','); power = TheIpIsRange(ip, AllowIPRanges); } else { power = TheIpIsRange(ip, IPRange); } if (power == false) Response.Redirect("error.htm"); } } /// /// 获取当前请求的IP地址 /// /// public static string GetIP() { //获取IP地址 HttpRequest request = HttpContext.Current.Request; string ipAddress = string.Empty; if (request.ServerVariables["HTTP_X_FORWARDED_FOR"] == null || request.ServerVariables["HTTP_X_FORWARDED_FOR"] == "") { ipAddress = request.ServerVariables["REMOTE_ADDR"]; } else if (request.ServerVariables["HTTP_X_FORWARDED_FOR"].IndexOf(",") >= 0) { int index = request.ServerVariables["HTTP_X_FORWARDED_FOR"].IndexOf(","); ipAddress = request.ServerVariables["HTTP_X_FORWARDED_FOR"].Substring(0, index - 1); } else if (request.ServerVariables["HTTP_X_FORWARDED_FOR"].IndexOf(";") >= 0) { int index = request.ServerVariables["HTTP_X_FORWARDED_FOR"].IndexOf(";"); ipAddress = request.ServerVariables["HTTP_X_FORWARDED_FOR"].Substring(0, index - 1); } else { ipAddress = request.ServerVariables["HTTP_X_FORWARDED_FOR"]; } if (ipAddress == "127.0.0.1") { ipAddress = GetLocalhostIPAddress(); } return ipAddress; } /// /// 获取本机IP /// /// private static string GetLocalhostIPAddress() { string hostName = System.Net.Dns.GetHostName(); System.Net.IPHostEntry hostInfo = System.Net.Dns.GetHostByName(hostName); System.Net.IPAddress[] IpAddr = hostInfo.AddressList; string localIP = string.Empty; for (int i = 0; i < IpAddr.Length; i++) { localIP += IpAddr[i].ToString(); } return localIP; } //接口函数 参数分别是你要判断的IP 和 你允许的IP范围 //（已经重载） //（允许同时指定多个数组） public static bool TheIpIsRange(string ip, params string[] ranges) { bool tmpRes = false; foreach (var item in ranges) { if (TheIpIsRange(ip, item)) { tmpRes = true; break; } } return tmpRes; } /// /// 判断指定的IP是否在指定的IP范围内 这里只能指定一个范围 /// /// /// /// public static bool TheIpIsRange(string ip, string ranges) { bool result = false; int count; string start_ip, end_ip; //检测指定的IP范围 是否合法 TryParseRanges(ranges, out count, out start_ip, out end_ip);//检测ip范围格式是否有效 if (ip == "::1") ip = "127.0.0.1"; try { IPAddress.Parse(ip);//判断指定要判断的IP是否合法 } catch (Exception) { throw new ApplicationException("要检测的IP地址无效"); } if (count == 1 && ip == start_ip) result = true;//如果指定的IP范围就是一个IP，那么直接匹配看是否相等 else if (count == 2)//如果指定IP范围 是一个起始IP范围区间 { byte[] start_ip_array = Get4Byte(start_ip);//将点分十进制 转换成 4个元素的字节数组 byte[] end_ip_array = Get4Byte(end_ip); byte[] ip_array = Get4Byte(ip); bool tmpRes = true; for (int i = 0; i < 4; i++) { //从左到右 依次比较 对应位置的 值的大小 ，一旦检测到不在对应的范围 那么说明IP不在指定的范围内 并将终止循环 if (ip_array[i] > end_ip_array[i] || ip_array[i] < start_ip_array[i]) { tmpRes = false; break; } } result = tmpRes; } return result; } //尝试解析IP范围 并获取闭区间的 起始IP (包含) private static void TryParseRanges(string ranges, out int count, out string start_ip, out string end_ip) { string[] _r = ranges.Split('-'); if (!(_r.Count() == 2 || _r.Count() == 1)) throw new ApplicationException("IP范围指定格式不正确，可以指定一个IP，如果是一个范围请用“-”分隔"); count = _r.Count(); start_ip = _r[0]; end_ip = ""; try { IPAddress.Parse(_r[0]); } catch (Exception) { throw new ApplicationException("IP地址无效"); } if (_r.Count() == 2) { end_ip = _r[1]; try { IPAddress.Parse(_r[1]); } catch (Exception) { throw new ApplicationException("IP地址无效"); } } } /// /// 将IP四组值 转换成byte型 /// /// /// static byte[] Get4Byte(string ip) { string[] _i = ip.Split('.'); List res = new List (); foreach (var item in _i) { res.Add(Convert.ToByte(item)); } return res.ToArray(); }