dns-go

DNS Client and Server

dns client

c := client.NewUDPClient("8.8.8.8:53")
query := packet.NewPacket()
query.AddQuestionA("google.com")
// query.AddQuestionAAAA("lsong.org")
// query.AddQuestionCNAME("lsong.org")
// query.AddQuestionTXT("lsong.org")
res, err := c.Query(query)
if err != nil {
  log.Fatal(err)
}
log.Println(res)

dns server

package examples

import (
  "log"

  "github.com/lsongdev/dns-go/packet"
  "github.com/lsongdev/dns-go/server"
)

type MyHandler struct{}

func (h *MyHandler) HandleQuery(conn *server.PackConn) {
  log.Println("query", conn.Request.Questions[0].Name)
  res := packet.NewPacketFromRequest(conn.Request)
  res.AddAnswer(&packet.DNSResourceRecordA{
    DNSResourceRecord: packet.DNSResourceRecord{
      Type:  packet.DNSTypeA,
      Class: packet.DNSClassIN,
      Name:  conn.Request.Questions[0].Name,
      TTL:   100,
    },
    Address: "127.0.0.1",
  })
  conn.WriteResponse(res)
}

func RunServer() {
  h := &MyHandler{}
  server.ListenUDP("0.0.0.0:53", h)
  server.ListenHTTP("0.0.0.0:8080", h)
}