walm · September 21, 2025 16:52 · Nov 18, 2016 · Nov 18, 2016 · Nov 18, 2016
diff --git a/main.go b/main.go
@@ -0,0 +1,57 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"strconv"
+
+	"github.com/miekg/dns"
+)
+
+var records = map[string]string{
+	"test.service.": "192.168.0.2",
+}
+
+func parseQuery(m *dns.Msg) {
+	for _, q := range m.Question {
+		switch q.Qtype {
+		case dns.TypeA:
+			log.Printf("Query for %s\n", q.Name)
+			ip := records[q.Name]
+			if ip != "" {
+				rr, err := dns.NewRR(fmt.Sprintf("%s A %s", q.Name, ip))
+				if err == nil {
+					m.Answer = append(m.Answer, rr)
+				}
+			}
+		}
+	}
+}
+
+func handleDnsRequest(w dns.ResponseWriter, r *dns.Msg) {
+	m := new(dns.Msg)
+	m.SetReply(r)
+	m.Compress = false
+
+	switch r.Opcode {
+	case dns.OpcodeQuery:
+		parseQuery(m)
+	}
+
+	w.WriteMsg(m)
+}
+
+func main() {
+	// attach request handler func
+	dns.HandleFunc("service.", handleDnsRequest)
+
+	// start server
+	port := 5353
+	server := &dns.Server{Addr: ":" + strconv.Itoa(port), Net: "udp"}
+	log.Printf("Starting at %d\n", port)
+	err := server.ListenAndServe()
+	defer server.Shutdown()
+	if err != nil {
+		log.Fatalf("Failed to start server: %s\n ", err.Error())
+	}
+}
diff --git a/test.sh b/test.sh
@@ -0,0 +1 @@
+dig @localhost -p 5353 test.service