以编程方式获取主机的DNS服务器 [英] Programmatically obtain DNS servers of host

问题描述

使用C ++，我想获得主机为三个操作系统使用的DNS服务器：OS X，FreeBSD和Windows。我想确认下面的方法确实是最佳实践，如果没有，那是一个优秀的选择。

• OS X ：更新后的链接 developer.apple.com


• Windows ： GetNetworkParams


• FreeBSD ： /etc/resolv.conf

感谢您的帮助！

解决方案

在许多unix系统（linux，bsd）上，您可以使用解析器函数获取DNS服务器列表： man 3 resolver 。

调用 res_init（）; 后，初始化解析器结构。解析器结构存储您需要的所有信息。 DNS服务器的列表存储在结构条目 nsaddr_list 中。

解析器结构的确切规格可以可能在 resolve.h 中找到。

使用解析器函数是获取DNS列表的首选方式服务器。 res_init（）将很可能用 /etc/resolv.conf 中的信息填充解析器结构。 p>

Using C++, I would like to obtain the DNS servers being used by a host for three operating systems: OS X, FreeBSD, and Windows. I'd like confirmation that the approaches below are indeed best practice, and if not, a superior alternative.

• OS X: already answered; updated link at developer.apple.com
• Windows: GetNetworkParams
• FreeBSD: /etc/resolv.conf

Thanks in advance for your help!

解决方案

On many unix systems (linux, bsd) you can use the resolver functions to obtain the list of DNS servers: man 3 resolver.

After calling res_init(); the resolver structure is initialized. The resolver structure stores all the information you need. The list of DNS servers are stored in the struct entry nsaddr_list.

The exact specification of the resolver structure can most likely be found in resolve.h.

Using the resolver functions is the preferred way to obtain the list of DNS servers. res_init() will most likely fill the resolver structure with the information found in /etc/resolv.conf.

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