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60 lines
1.1 KiB
Go
60 lines
1.1 KiB
Go
package main
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import (
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"bytes"
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"crypto/tls"
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"fmt"
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"io/ioutil"
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"net/http"
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"time"
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"github.com/miekg/dns"
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)
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var httpclientCF = &http.Client{
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Timeout: 8 * time.Second,
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Transport: &http.Transport{
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TLSClientConfig: &tls.Config{ServerName: "cloudflare-dns.com"},
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TLSHandshakeTimeout: 5 * time.Second,
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},
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}
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// CloudflareHTTPDns cloudflare http dns
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type CloudflareHTTPDns struct {
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}
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// Exchange send request to server and get result
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func (cf *CloudflareHTTPDns) Exchange(m *dns.Msg, addr string) (m1 *dns.Msg, d time.Duration, err error) {
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u := fmt.Sprintf("https://%s/dns-query", addr)
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data, err := m.Pack()
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if err != nil {
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return
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}
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body := bytes.NewBuffer(data)
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req, err := http.NewRequest("POST", u, body)
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if err != nil {
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return
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}
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req.Header.Set("Content-Type", "application/dns-udpwireformat")
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resp, err := httpclientCF.Do(req)
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if err != nil {
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return
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}
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defer resp.Body.Close()
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data, err = ioutil.ReadAll(resp.Body)
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if err != nil {
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return
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}
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m1 = new(dns.Msg)
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if err = m1.Unpack(data); err != nil {
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return
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}
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return
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}
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