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60 lines
1014 B
Go
60 lines
1014 B
Go
package main
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import (
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"bytes"
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"context"
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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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type httpclient struct {
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Net string
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Timeout time.Duration
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HTTPClient *http.Client
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}
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func (c *httpclient) Exchange(msg *dns.Msg, upstream string) (*dns.Msg, int, error) {
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data, 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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req, err := http.NewRequest("POST", upstream, bytes.NewReader(data))
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if err != nil {
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return nil, 0, err
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}
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req.Header.Set("Content-Type", dnsMsgType)
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ctx, cancel := context.WithTimeout(context.Background(), c.Timeout)
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defer cancel()
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req = req.WithContext(ctx)
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resp, err := c.HTTPClient.Do(req)
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if err != nil {
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return nil, 0, err
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return nil, 0, fmt.Errorf("http error %d", resp.StatusCode)
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}
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data, err = io.ReadAll(resp.Body)
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if err != nil {
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return nil, 0, err
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}
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m := new(dns.Msg)
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if err = m.Unpack(data); err != nil {
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return nil, 0, err
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}
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return m, 0, nil
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}
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