linux函数inet

linux函数inet_ntoa会导致dns查询吗？(will linux function inet_ntoa result in a dns query?)

请问linux函数inet_ntoa会导致linux中的dns查询吗？ 谁能举一些这方面的例子？ 我想限制所做的dns查找，在这种情况下使用inet_ntoa会导致dns查询？

Will linux function inet_ntoa result in a dns query in linux ? Can anyone give some example on this ? I want to limit the dns lookups made , in that case using inet_ntoa will result in a dns query ?

最满意答案

不，它只是将给定的“二进制编码”IPv4地址转换为字符串。

顺便说一句，与IPv4一起，这个功能也越来越“老式”。 除此之外，它不是线程安全的，因为返回地址的缓冲区将在每次调用时重用。

如果在程序中使用getnameinfo()并提供NI_NUMERICHOST和NI_NUMERICSERV标志，该函数也将避免进行DNS查询，但它将显示它所知道的所有类型的地址（主要是IPv4和IPv6）。

No, it just converts the given "binary coded" IPv4 address into a string.

BTW, together with IPv4, this function as well gets more and more "old-style". Besides that, it is not thread-safe as the buffer whose address is returned will be reused on every call.

If you use getnameinfo() in your programs and supply the flags NI_NUMERICHOST and NI_NUMERICSERV, the function will refrain from doing DNS queries as well, but it will display all types of addresses it knows about (mostly IPv4 and IPv6).