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@imfht imfht/httpdns.go forked from fangdingjun/httpdns.go
Created Sep 4, 2018

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What would you like to do?
use dnspod's httpdns service to query dns
package main
import (
"bytes"
"fmt"
"github.com/miekg/dns"
"io/ioutil"
"log"
"net/http"
)
var server_url string = "http://119.29.29.29/d?dn=%s"
func get_a(domain string) []string {
url := fmt.Sprintf(server_url, domain)
r, err := http.Get(url)
if err != nil {
fmt.Println(err)
return []string{}
}
defer r.Body.Close()
buf, err := ioutil.ReadAll(r.Body)
if err != nil {
fmt.Println(err)
return []string{}
}
ip := []string{}
ips := bytes.Split(buf, []byte(";"))
for _, ii := range ips {
ip = append(ip, string(ii))
}
return ip
}
func handleRoot(w dns.ResponseWriter, r *dns.Msg) {
// Only A supported
if r.Question[0].Qtype != dns.TypeA {
dns.HandleFailed(w, r)
return
}
domain := r.Question[0].Name
ip := get_a(domain)
if len(ip) == 0 {
dns.HandleFailed(w, r)
return
}
msg := new(dns.Msg)
msg.SetReply(r)
for _, ii := range ip {
s := fmt.Sprintf("%s 3600 IN A %s",
dns.Fqdn(domain), ii)
rr, _ := dns.NewRR(s)
msg.Answer = append(msg.Answer, rr)
}
w.WriteMsg(msg)
}
func main() {
dns.HandleFunc(".", handleRoot)
err := dns.ListenAndServe("0.0.0.0:53", "udp", nil)
if err != nil {
log.Fatal(err)
}
}
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