如何在 C/C++ 中构建自定义的简单 DNS 服务器

问题描述

我需要在 C/C++ 中构建一个自定义的简单非权威缓存 DNS 服务器.任何指导?链接?样品?

I need to build a custom simple non-authoritative caching DNS server in C/C++. Any guidance? Links? Samples?

推荐答案

没有简单"缓存 DNS 服务器这样的东西，特别是如果您想要体面的安全性.最近的 DNS 攻击表明递归 DNS 服务器中的缓存功能特别容易受到攻击.

There's no such thing as a "simple" cacheing DNS server, particularly if you want decent security. Recent DNS attacks have shown that the cacheing function in recursive DNS servers is particularly vulnerable.

重新评估您是否真的需要自己的本地缓存.如果不这样做，您可能最好修改现有的 DNS 代理代码(例如dnsmasq").

Re-evaluate whether you actually need local cacheing of your own. If you don't, you're probably better off modifying existing DNS proxy code (such as 'dnsmasq').

如果您确实想自己动手，有一些不错的库，例如 ldns 可以提供对底层 DNS 数据包的访问.

If you do want to roll-your-own, there are good libraries such as ldns which can provide the access to the underlying DNS packets.

我自己使用 ldns 和 libevent 来实现我在前面的问题中提到的 Fuzzing DNS 服务器.

I'm using ldns myself in conjunction with libevent to implement the Fuzzing DNS server I mentioned in an earlier question.

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