对于nslookup命令,它有nslookup somewhere.com some.dns.server.
但是,似乎golang dnsclient只从/etc/resolv.conf加载配置
代码在这里：https://golang.org/src/net/dnsclient_unix.go#L225
golang标准库是否提供类似的功能
func LookupTXT(name string,dnsServer string)(txt [] string,err error)？
需求：
1.不要更改默认的/etc/resolv.conf.
@holys
“github.com/miekg/dns is too heavy for me”
它并不那么沉重：
- 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,您应该看到：
- $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
