sing-box/experimental/clashapi/dns.go

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2023-02-02 15:58:13 +08:00
package clashapi
import (
"context"
"net/http"
"github.com/sagernet/sing-box/adapter"
C "github.com/sagernet/sing-box/constant"
"github.com/sagernet/sing/common"
"github.com/go-chi/chi/v5"
"github.com/go-chi/render"
"github.com/miekg/dns"
)
func dnsRouter(router adapter.Router) http.Handler {
r := chi.NewRouter()
r.Get("/query", queryDNS(router))
return r
}
func queryDNS(router adapter.Router) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
name := r.URL.Query().Get("name")
qTypeStr := r.URL.Query().Get("type")
if qTypeStr == "" {
qTypeStr = "A"
}
qType, exist := dns.StringToType[qTypeStr]
if !exist {
render.Status(r, http.StatusBadRequest)
render.JSON(w, r, newError("invalid query type"))
return
}
ctx, cancel := context.WithTimeout(context.Background(), C.DNSTimeout)
defer cancel()
msg := dns.Msg{}
msg.SetQuestion(dns.Fqdn(name), qType)
resp, err := router.Exchange(ctx, &msg)
if err != nil {
render.Status(r, http.StatusInternalServerError)
render.JSON(w, r, newError(err.Error()))
return
}
responseData := render.M{
"Status": resp.Rcode,
"Question": resp.Question,
"Server": "internal",
"TC": resp.Truncated,
"RD": resp.RecursionDesired,
"RA": resp.RecursionAvailable,
"AD": resp.AuthenticatedData,
"CD": resp.CheckingDisabled,
}
rr2Json := func(rr dns.RR) render.M {
header := rr.Header()
return render.M{
"name": header.Name,
"type": header.Rrtype,
"TTL": header.Ttl,
"data": rr.String()[len(header.String()):],
}
}
if len(resp.Answer) > 0 {
responseData["Answer"] = common.Map(resp.Answer, rr2Json)
}
if len(resp.Ns) > 0 {
responseData["Authority"] = common.Map(resp.Ns, rr2Json)
}
if len(resp.Extra) > 0 {
responseData["Additional"] = common.Map(resp.Extra, rr2Json)
}
render.JSON(w, r, responseData)
}
}