// create a new message object msg := new(dns.Msg) // add an additional record to the message extra := &dns.Txt{ Txt: []string{"some additional text"}, } msg.Extra = append(msg.Extra, extra) // process the message, including the extra record client := &dns.Client{} response, _, err := client.Exchange(msg, "8.8.8.8:53") if err != nil { fmt.Println("error querying DNS server:", err) } fmt.Println("response:", response)
// parse a DNS message from a byte slice data := []byte{ /* some DNS message data */ } msg := &dns.Msg{} err := msg.Unpack(data) if err != nil { fmt.Println("error parsing DNS message:", err) } // access the message's additional records for _, extra := range msg.Extra { fmt.Println("extra record:", extra) }In this example, we parse a DNS message from a byte slice using the Unpack method of the Msg object. We can then access the additional records of the message using the Extra field. Overall, the MsgExtra structure is a key component of the github.com/miekg/dns package, and allows developers to work with additional metadata in DNS messages.