You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
65 lines
1.5 KiB
Go
65 lines
1.5 KiB
Go
package main
|
|
|
|
import (
|
|
"io"
|
|
"net/http"
|
|
|
|
log "github.com/fangdingjun/go-log/v5"
|
|
"github.com/miekg/dns"
|
|
)
|
|
|
|
const dnsMsgType = "application/dns-message"
|
|
|
|
func (srv *server) handleHTTPReq(w http.ResponseWriter, r *http.Request) {
|
|
/*
|
|
ctype := r.Header.Get("content-type")
|
|
if !strings.HasPrefix(ctype, dnsMsgType) {
|
|
log.Errorf("request type %s, require %s", ctype, dnsMsgType)
|
|
http.Error(w, "dns message is required", http.StatusBadRequest)
|
|
return
|
|
}
|
|
*/
|
|
|
|
if r.ContentLength < 10 {
|
|
log.Errorf("message is too small, %v", r.ContentLength)
|
|
http.Error(w, "message is too small", http.StatusBadRequest)
|
|
return
|
|
}
|
|
|
|
data, err := io.ReadAll(r.Body)
|
|
if err != nil {
|
|
log.Errorln("read request body", err)
|
|
http.Error(w, "read request failed", http.StatusBadRequest)
|
|
return
|
|
}
|
|
|
|
msg := new(dns.Msg)
|
|
if err := msg.Unpack(data); err != nil {
|
|
log.Errorln("parse dns message", err)
|
|
http.Error(w, "parse dns message error", http.StatusBadRequest)
|
|
return
|
|
}
|
|
|
|
m, err := getResponseFromUpstream(msg, srv.upstreams)
|
|
if err != nil {
|
|
log.Debugln("query", msg.Question[0].String(), "timeout")
|
|
http.Error(w, "query upstream server failed", http.StatusServiceUnavailable)
|
|
return
|
|
}
|
|
|
|
for _, a := range m.Answer {
|
|
log.Debugln("result", a.String())
|
|
}
|
|
w.Header().Set("content-type", dnsMsgType)
|
|
d, _ := m.Pack()
|
|
w.Write(d)
|
|
}
|
|
|
|
func (srv *server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
|
if r.RequestURI != srv.addr.Path {
|
|
http.Error(w, "Path not found", http.StatusNotFound)
|
|
return
|
|
}
|
|
srv.handleHTTPReq(w, r)
|
|
}
|