18b92e1117
* WIP: make CoreDNS DoH Server * It works * Fix tests * Review from Tom - on diff. PR * correct mime type * Cleanups and use the pkg/nonwriter * rename and updates * implement get * implement GET * Code review comments * correct context * tweaks * code review
56 lines
1.1 KiB
Go
56 lines
1.1 KiB
Go
package dnsserver
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import (
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"encoding/base64"
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"fmt"
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"io/ioutil"
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"net/http"
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"github.com/miekg/dns"
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)
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// mimeTypeDOH is the DoH mimetype that should be used.
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const mimeTypeDOH = "application/dns-message"
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// pathDOH is the URL path that should be used.
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const pathDOH = "/dns-query"
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// postRequestToMsg extracts the dns message from the request body.
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func postRequestToMsg(req *http.Request) (*dns.Msg, error) {
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defer req.Body.Close()
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buf, err := ioutil.ReadAll(req.Body)
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if err != nil {
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return nil, err
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}
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m := new(dns.Msg)
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err = m.Unpack(buf)
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return m, err
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}
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// getRequestToMsg extract the dns message from the GET request.
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func getRequestToMsg(req *http.Request) (*dns.Msg, error) {
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values := req.URL.Query()
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b64, ok := values["dns"]
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if !ok {
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return nil, fmt.Errorf("no 'dns' query parameter found")
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}
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if len(b64) != 1 {
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return nil, fmt.Errorf("multiple 'dns' query values found")
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}
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return base64ToMsg(b64[0])
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}
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func base64ToMsg(b64 string) (*dns.Msg, error) {
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buf, err := b64Enc.DecodeString(b64)
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if err != nil {
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return nil, err
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}
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m := new(dns.Msg)
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err = m.Unpack(buf)
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return m, err
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}
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var b64Enc = base64.RawURLEncoding
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