57 lines
1.3 KiB
Go
57 lines
1.3 KiB
Go
// SPDX-License-Identifier: BSD-3-Clause
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package query
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import (
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"bytes"
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"fmt"
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"io"
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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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// Resolve a DNS-over-HTTPS query
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//
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// Currently only supports POST requests
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func ResolveHTTPS(msg *dns.Msg, server string) (*dns.Msg, time.Duration, error) {
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httpR := &http.Client{}
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buf, err := msg.Pack()
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if err != nil {
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return nil, 0, err
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}
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// query := server + "?dns=" + base64.RawURLEncoding.EncodeToString(buf)
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req, err := http.NewRequest("POST", server, bytes.NewBuffer(buf))
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if err != nil {
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return nil, 0, fmt.Errorf("DoH: %s", err.Error())
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}
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req.Header.Set("Content-Type", "application/dns-message")
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req.Header.Set("Accept", "application/dns-message")
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now := time.Now()
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res, err := httpR.Do(req)
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rtt := time.Since(now)
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if err != nil {
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return nil, 0, fmt.Errorf("DoH HTTP request error: %s", err.Error())
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}
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defer res.Body.Close()
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if res.StatusCode != http.StatusOK {
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return nil, 0, fmt.Errorf("DoH server responded with HTTP %d", res.StatusCode)
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}
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fullRes, err := io.ReadAll(res.Body)
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if err != nil {
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return nil, 0, fmt.Errorf("DoH body read error: %s", err.Error())
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}
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response := dns.Msg{}
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err = response.Unpack(fullRes)
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if err != nil {
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return nil, 0, fmt.Errorf("DoH dns message unpack error: %s", err.Error())
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}
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return &response, rtt, nil
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}
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