54 lines
1.3 KiB
Go
54 lines
1.3 KiB
Go
package query
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"io"
|
|
"net/http"
|
|
"time"
|
|
|
|
"github.com/miekg/dns"
|
|
)
|
|
|
|
// Resolve a DNS-over-HTTPS query
|
|
//
|
|
// Currently only supports POST requests
|
|
func ResolveHTTPS(msg *dns.Msg, server string) (*dns.Msg, time.Duration, error) {
|
|
httpR := &http.Client{}
|
|
buf, err := msg.Pack()
|
|
if err != nil {
|
|
return nil, 0, err
|
|
}
|
|
// query := server + "?dns=" + base64.RawURLEncoding.EncodeToString(buf)
|
|
req, err := http.NewRequest("POST", server, bytes.NewBuffer(buf))
|
|
if err != nil {
|
|
return nil, 0, fmt.Errorf("DoH: %s", err.Error())
|
|
}
|
|
req.Header.Set("Content-Type", "application/dns-message")
|
|
req.Header.Set("Accept", "application/dns-message")
|
|
|
|
now := time.Now()
|
|
res, err := httpR.Do(req)
|
|
rtt := time.Since(now)
|
|
|
|
if err != nil {
|
|
return nil, 0, fmt.Errorf("DoH HTTP request error: %s", err.Error())
|
|
}
|
|
defer res.Body.Close()
|
|
|
|
if res.StatusCode != http.StatusOK {
|
|
return nil, 0, fmt.Errorf("DoH server responded with HTTP %d", res.StatusCode)
|
|
}
|
|
|
|
fullRes, err := io.ReadAll(res.Body)
|
|
if err != nil {
|
|
return nil, 0, fmt.Errorf("DoH body read error: %s", err.Error())
|
|
}
|
|
response := dns.Msg{}
|
|
err = response.Unpack(fullRes)
|
|
if err != nil {
|
|
return nil, 0, fmt.Errorf("DoH dns message unpack error: %s", err.Error())
|
|
}
|
|
|
|
return &response, rtt, nil
|
|
}
|