Asp.NET MVC REST API：如何获取客户端主机名

Question

我正在用 ASP.NET MVC3 开发 REST API 应用程序。我正在尝试让客户端客户端主机名称生效，但无法成功。我在多个应用程序中使用此 API，所以我想记录域名。

Link 1

 HttpContext.Current.Request.UserHostAddress;
 System.Web.HttpContext.Current.Request.UserHostName;
 System.Web.HttpContext.Current.Request.UserHostAddress;

Link 2

private string GetClientIp(HttpRequestMessage request)
{
    if (request.Properties.ContainsKey("MS_HttpContext"))
    {
        return ((HttpContextWrapper)request.Properties["MS_HttpContext"]).Request.UserHostAddress;
    }
    else if (request.Properties.ContainsKey(RemoteEndpointMessageProperty.Name))
    {
        RemoteEndpointMessageProperty prop;
        prop = (RemoteEndpointMessageProperty)request.Properties[RemoteEndpointMessageProperty.Name];
        return prop.Address;
    }
    else
    {
        return null;
    }
}

所有这些选项都提供 IP 地址，但我想获取主机名

API 控制器 www.myapi.com

public class TESTController : ApiController
{
    public TESTController()
    {
    }

    [HttpGet]
    public object Add(string data = "")
    {
        try
        {
            string result = "0";

            if (!string.IsNullOrEmpty(data))
            {
                //should be www.myapiconsume.com
                var host = System.Web.HttpContext.Current.Request.UserHostName;
                var ip = System.Web.HttpContext.Current.Request.UserHostAddress;
            }

            return new { response = result };
        }
        catch (Exception ex)
        {
            throw ex;
        }

    }
}

从不同的域调用 API 操作 www.myapiconsume.com

 public class HomeController : Controller
    {
        public ActionResult Index()
        {
            var url = "http://myapi.com/api/test/add?data={0}";
            url = string.Format(url, "{ data}");
            WebClient client = new WebClient();
            var result = client.DownloadString(url);
            return Content(result);
        }

    }

我怎样才能得到这个？

Answer 1

您可以使用Dns.GetHostEntry方法进行反向查找。

public static string ReverseLookup(string ip)
{
    if (String.IsNullOrWhiteSpace(ip))
        return ip;

    try
    {
        IPHostEntry host = Dns.GetHostEntry(ip);

        return host != null ? host.HostName : ip;
    }
    catch (SocketException)
    {
        return ip;
    }
}

Answer 2

很遗憾，默认情况下不提供它；如果你在同一个网络上，你可以试试：

var result = System.Net.Dns.GetHostEntry(System.Web.HttpContext.Current.Request.ServerVariables("remote_addr"));

但如果客户端通过代理等也可能存在问题。

Answer 3

更新调用动作：

var url = "http://myapi.com/api/test/add?data={0}";
url = string.Format(url, "{ data}");
WebClient client = new WebClient();
client.Headers.Add("Referer", Request.Url.AbsoluteUri);
var result = client.DownloadString(url);
return Content(result);

然后在目标服务器上：

Request.UrlReferrer.Host

如果您的服务器有公共 ip，那么您可以尝试解析它：

Dns.GetHostEntry(HttpContext.Current.Request.UserHostAddress)