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|
package main
import (
"fmt"
"net"
)
func ForwardQuestions(addr string, questions []DNSQuestion, id uint16) []DNSAnswer {
answers := []DNSAnswer{}
udpConn, err := net.Dial("udp", addr)
if err != nil {
fmt.Println("Failed to connect to address:", err)
return answers
}
defer udpConn.Close()
for _, question := range questions {
questionBytes := question.Bytes()
header := DNSHeader{
ID: id,
QR: 0,
OPCODE: 0,
AA: 0,
TC: 0,
RD: 1,
RA: 0,
Z: 0,
RCODE: 0,
QDCOUNT: 1,
ANCOUNT: 0,
NSCOUNT: 0,
ARCOUNT: 0,
}
headerBytes := header.Bytes()
buf := append(headerBytes, questionBytes...)
_, err = udpConn.Write(buf)
if err != nil {
fmt.Println("Failed to send data:", err)
return answers
}
responseBuf := make([]byte, 512)
n, err := udpConn.Read(responseBuf)
if err != nil {
fmt.Println("Failed to receive data:", err)
return answers
}
responseHeader := ParseHeader(responseBuf[:n])
answers = append(answers, ParseAnswers(responseBuf[:n], responseHeader.QDCOUNT, responseHeader.ANCOUNT)...)
}
return answers
}
|
