76 lines
1.7 KiB
Go
76 lines
1.7 KiB
Go
package route
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import (
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"context"
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"math"
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"net/http"
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"github.com/Dreamacro/clash/component/resolver"
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"github.com/go-chi/chi/v5"
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"github.com/go-chi/render"
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"github.com/miekg/dns"
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"github.com/samber/lo"
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)
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func dnsRouter() http.Handler {
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r := chi.NewRouter()
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r.Get("/query", queryDNS)
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return r
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}
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func queryDNS(w http.ResponseWriter, r *http.Request) {
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name := r.URL.Query().Get("name")
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qTypeStr, _ := lo.Coalesce(r.URL.Query().Get("type"), "A")
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qType, exist := dns.StringToType[qTypeStr]
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if !exist {
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render.Status(r, http.StatusBadRequest)
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render.JSON(w, r, newError("invalid query type"))
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return
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}
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ctx, cancel := context.WithTimeout(context.Background(), resolver.DefaultDNSTimeout)
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defer cancel()
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msg := dns.Msg{}
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msg.SetQuestion(dns.Fqdn(name), qType)
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resp, err := resolver.DefaultResolver.ExchangeContext(ctx, &msg)
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if err != nil {
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render.Status(r, http.StatusInternalServerError)
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render.JSON(w, r, newError(err.Error()))
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return
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}
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responseData := render.M{
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"Status": resp.Rcode,
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"Question": resp.Question,
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"TC": resp.Truncated,
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"RD": resp.RecursionDesired,
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"RA": resp.RecursionAvailable,
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"AD": resp.AuthenticatedData,
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"CD": resp.CheckingDisabled,
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}
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rr2Json := func(rr dns.RR, _ int) render.M {
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header := rr.Header()
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return render.M{
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"name": header.Name,
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"type": header.Rrtype,
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"TTL": header.Ttl,
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"data": lo.Substring(rr.String(), len(header.String()), math.MaxUint),
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}
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}
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if len(resp.Answer) > 0 {
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responseData["Answer"] = lo.Map(resp.Answer, rr2Json)
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}
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if len(resp.Ns) > 0 {
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responseData["Authority"] = lo.Map(resp.Ns, rr2Json)
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}
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if len(resp.Extra) > 0 {
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responseData["Additional"] = lo.Map(resp.Extra, rr2Json)
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}
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render.JSON(w, r, responseData)
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}
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