为什么golang Lookup ***功能不能提供服务器参数？ [英] Why golang Lookup*** function can't provide a server parameter?

问题描述

对于 nslookup 命令，它有 nslookup somewhere.com some.dns.server 。

但是，似乎golang dnsclient仅从 /etc/resolv.conf

However, it seems that golang dnsclient only load config from /etc/resolv.conf

代码在这里： https://golang.org/ src / net / dnsclient_unix.go＃L225

golang标准库是否提供类似
func LookupTXT（name string，dnsServer string）（txt [] string，err error）？

Does the golang standard library provide something like func LookupTXT(name string, dnsServer string) (txt []string, err error) ?

要求：
1.不要更改默认的 /etc/resolv.conf 。

推荐答案

@holys

github.com/miekg/dns对我而言太重了

"github.com/miekg/dns is too heavy for me"

这不是很重：

package main

import (
    "log"

    "github.com/miekg/dns"
)

func main() {

    target := "microsoft.com"
    server := "8.8.8.8"

    c := dns.Client{}
    m := dns.Msg{}
    m.SetQuestion(target+".", dns.TypeA)
    r, t, err := c.Exchange(&m, server+":53")
    if err != nil {
        log.Fatal(err)
    }
    log.Printf("Took %v", t)
    if len(r.Answer) == 0 {
        log.Fatal("No results")
    }
    for _, ans := range r.Answer {
        Arecord := ans.(*dns.A)
        log.Printf("%s", Arecord.A)
    }
}

运行时，您应该会看到：

When run, you should see:

$ go run dns.go
2015/07/26 00:24:46 Took 16.138928ms
2015/07/26 00:24:46 134.170.188.221
2015/07/26 00:24:46 134.170.185.46

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