我可以暂时覆盖一个.NET应用程序中的DNS解析？ [英] Can I temporarily override DNS resolution within a .NET application?

问题描述

我有一个运行一组扫描特定的响应码直播网站NUnit的测试一些包装代码。

I have some wrapper code that runs a set of NUnit tests that scan live websites for certain response codes.

我想运行针对不同的这些测试服务器。当手动运行，我可以通过编辑/ etc做到这一点/ hosts文件中Windows\System32\drivers和临时设置www.mysite.com到10.0.0.whatever

I'd like to run these tests against a different server. When running manually, I can do this by editing the /etc/hosts file in Windows\System32\drivers and temporarily setting www.mysite.com to 10.0.0.whatever

有没有什么方法可以让我一个.NET控制台应用程序中做同样的 - 暂时覆盖DNS记录或以某种方式拦截分辨率，并返回一个不同的IP地址

Is there any way I can do the same within a .NET console application - temporarily override a DNS record or somehow intercept the resolution and return a different IP address?

编辑：这是一个Web场测试中的多台服务器。我有三个Live服务器，所有这些都认为他们是www.mysite.com。由于服务器使用HTTP主机头，我不能只是运行对服务器1，服务器2话，那么服务器3的测试，因为HTTP请求的http：//服务器1 / 将不会返回同样的事情作为 http://www.mysite.com/请求说的解决到Server1 ..

This is for testing multiple servers in a web farm. I have three live servers, all of which THINK they are www.mysite.com. Because the servers use HTTP host headers, I can't just run a test against server1, then server2, then server3, because an HTTP request to http://server1/ will NOT return the same thing as a request to http://www.mysite.com/ that's resolved to server1...

推荐答案

在与C ++过去我能勾到WSOCK32.DLL的gethostbyname函数和重新路由DNS请求。我用微软走弯路库来做到这一点。

In the past with C++ I was able to hook to the WSOCK32.DLL's gethostbyname function and reroute DNS requests. I used the Microsoft Detours library to do that.

至于C＃我发现这一点： HTTP ：//easyhook.codeplex.com/ 的，也许它会帮助你。基本上，你可以连接到的gethostbyname 窗口功能，并执行自己的代码或返回不同的结果（不同IP）。

As for C# I found this: http://easyhook.codeplex.com/ maybe it will help you. Basically you can hook to the gethostbyname windows function and execute your own code or return a different result (different IP).

其他可能的解决方案是暂时（和编程）编辑hosts文件的应用程序开始和结束时间。从你自己的代码

The other possible solution is to temporarily (and programatically) edit the hosts file when the application starts and ends. From your own code.

编辑：我发现我的旧的C ++代码，也许它会给你一个提示做什么

I found my old C++ code, maybe it will give you a hint what to do.

struct hostent FAR * WSAAPI MyGetHostByName(IN const char FAR * name)
{
    // Call the regular function 
    struct hostent* ret = GetHostByNameFunction(name);
    // Check if it's the hostname you want to reroute
    if ( strcmp(host, (char*)name) == 0 )
    {
        // Edit the IP returned by the regular gethostbyname
        ret->h_addr_list[0] = hostIP;
        ret->h_length = 15;
    }
    // Return the result
    return ret;
}

EDIT2：找到另一个链接向easyhooks的较新版本

Found another link with newer release of easyhooks

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