执行直接 DNS 查找的代码
我正在考虑进行一项实验，以不同的方式跟踪 DNS 值（例如它们更改的频率等等）。 为此，我需要能够直接向服务器发出 DNS 请求，以便 1) 我知道它来自哪个服务器，2) 我可以请求来自多个服务器的响应，3) 我可以避免本地操作系统运行缓存。
有谁知道有一个库（按优先顺序是 c#、D、C、C++）可以让我直接查询 DNS 服务器吗？ 如果不行，有谁知道一个易于理解的描述我可以通过哪个 DNS 协议来实现这样的系统？
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.
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?
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我只有 C 语言的经验，所以这是我的列表：
libresolv 是旧的、传统的和标准的方法。 它在每个 Unix 上都可用（类型
man 3 解析器），并包括类似的例程res_query或多或少可以满足您的需求。 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）。ldns 是现代而闪亮的解决方案。 您有优秀的在线文档。
一个非常常见的库，但显然没有维护，是 adns .
I have experience only with C, so here is my list:
libresolv is the old, traditional and standard way. It is available on every Unix (type
man 3 resolver) and includes routines likeres_querywhich 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 is the modern and shiny solution. You have good documentation online.
a very common library, but apparently unmaintained, is adns.
对于 C，我会选择 http://cr.yp.to/djbdns/ Blub/library.html （如果您需要完全控制，则为低级部分，即
dns_transmit*和朋友）——对于 C#，可能是 http://www.c-sharpcorner.com/UploadFile/ivxivx/DNSClient12122005234612PM/DNSClient.aspx (现在无法测试那个，因此“也许”！）。For C, I'd go with http://cr.yp.to/djbdns/blurb/library.html (the low-level parts if you need total control, i.e.
dns_transmit*and friends) -- for C#, maybe http://www.c-sharpcorner.com/UploadFile/ivxivx/DNSClient12122005234612PM/DNSClient.aspx (can't test that one right now, whence the "maybe"!).DNS 规范分布在许多RFC（请参阅漂亮的图表），我强烈建议不要< /strong> 从头开始实现存根解析器。 有很多机会会出错。 DNS 在过去几年中发展了很多。 如果你勇敢而疯狂，这里有最重要的 RFC：
The DNS specification is spread over many RFC (see a nice graph) and I would strongly advise not to implement a stub resolver from scratch. There are many opportunities to get it wrong. The DNS evolved a lot in the last years. If you are brave and crazy, here are the most important RFC:
libdns（我认为它是绑定的一部分）。 有一个 cygwin 端口可能对 Windows 环境有用。
http://rpm2html.osmirror.nl/libdns.so.21.html
libdns (I think it's part of bind). There's a cygwin port which may be useful for windows environments.
http://rpm2html.osmirror.nl/libdns.so.21.html