代码进行直接DNS查找 [英] Code to do a direct DNS lookup

问题描述

我正在考虑以不同的方式运行实验来跟踪DNS值（例如，他们更改频率以及什么）。为了做到这一点，我需要能够直接向服务器发出一个DNS请求，以便1）我知道它是什么服务器，2）我可以请求几个服务器的响应，3）我可以避免本地操作系统运行缓存有没有人知道一个图书馆（c＃，D，C，C ++，按照这个优先顺序），让我直接查询一个DNS服务器？

I'm thinking of running an experiment to track DNS values in different ways (like how often they change and whatnot). To do this I will need to be able to make a DNS request directly to a server so that 1) I known what server it came from, 2) I can request responses from several servers and 3) I can avoid the local OS run cache.

/ em>没有，有没有人知道一个容易理解的DNS协议的描述，我可以实现这样一个系统？

Does anyone know of a library (c#, D, C, C++ in that order of preference) that will let me directly query a DNS server? Failing that, does anyone know of a easy to understand description of the DNS protocol that I could implement such a system from?

推荐答案

我只有C的经验，所以这里是我的列表：

I have experience only with C, so here is my list:

• libresolv是旧的，传统的和标准的方式。它可以在每个Unix（类型 man 3 resolver ）上使用，并且包括例如
  res_query 或更少你想要什么要查询特定的名称服务器，您通常会更新全局变量 _res.nsaddr_list （请注意，显然，它不适用于IPv6 ）。

• libresolv is the old, traditional and standard way. It is available on every Unix (type man 3 resolver) and includes routines like res_query which does more or less what you want. To query a specific name server, you typically update the global variable _res.nsaddr_list (do note that, apparently, it does not work with IPv6).

ldns 是现代和闪亮的解决方案。您有在线良好的文档。

ldns is the modern and shiny solution. You have good documentation online.

一个非常常见的图书馆，但显然不成立，是 adns 。

a very common library, but apparently unmaintained, is adns.

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