debug

.github/workflows/test.yaml

@@ -27,5 +27,8 @@ jobs:
       - name: Fmt
         run: make fmt
 
+      - name: run main
+        run: make build && ./drill
+
       - name: Test
         run: make test

main.go

@@ -1,3 +1,63 @@
 package main
 
-func main() {}
+import (
+	"log"
+	"net"
+)
+
+func main() {
+	qname := "google.com"
+	qtype := A
+
+	packet := NewDnsPacket()
+	packet.header.id = 1234
+	packet.header.questions = 1
+	packet.header.recursionDesired = true
+	packet.questions = append(packet.questions, DnsQuestion{name: qname, qtype: qtype})
+
+	requestBuf := NewBytePacketBuffer()
+	err := packet.write(requestBuf)
+	if err != nil {
+		log.Fatalf("error writing packet: %v", err)
+	}
+
+	udpAddr, err := net.ResolveUDPAddr("udp", "8.8.8.8:53")
+	if err != nil {
+		log.Fatalf("error resolving address: %v", err)
+	}
+	conn, err := net.DialUDP("udp", nil, udpAddr)
+	if err != nil {
+		log.Fatalf("error dialing: %v", err)
+	}
+	defer conn.Close()
+	_, err = conn.Write(requestBuf.buf[0:requestBuf.pos])
+	if err != nil {
+		log.Fatalf("error writing request: %v", err)
+	}
+
+	responseBuf := NewBytePacketBuffer()
+	_, _, err = conn.ReadFromUDP(responseBuf.buf)
+	if err != nil {
+		log.Fatalf("error reading response: %v", err)
+	}
+
+	resPacket := NewDnsPacket()
+	err = resPacket.fromBuffer(responseBuf)
+	if err != nil {
+		log.Fatalf("error reading response: %v", err)
+	}
+
+	log.Printf("response packet header: %+v", resPacket.header)
+	for _, q := range resPacket.questions {
+		log.Printf("question: %+v", q)
+	}
+	for _, a := range resPacket.answers {
+		log.Printf("answer: %+v", a)
+	}
+	for _, a := range resPacket.authorities {
+		log.Printf("authority: %+v", a)
+	}
+	for _, a := range resPacket.resources {
+		log.Printf("resource: %+v", a)
+	}
+}