Stuck on #gt1 DNS for multiple questions

Challenges
1

I’m stuck on Stage #(change to your stage, ex. #GT1).

The 1:1 questions and answers work just fine, but for sending a query for 2 questions separately is causing an io timeout

Here are my logs:

[your_program] There are more than 1 questions!
[your_program] [{QName:abc.longassdomainname.com QType:1 QClass:1} {QName:def.longassdomainname.com QType:1 QClass:1}]
[your_program] Iterating over [{QName:abc.longassdomainname.com QType:1 QClass:1}] of [{QName:abc.longassdomainname.com QType:1 QClass:1} {QName:def.longassdomainname.com QType:1 QClass:1}]
[your_program] [{QName:abc.longassdomainname.com QType:1 QClass:1}]
[your_program] Question: {QName:abc.longassdomainname.com QType:1 QClass:1}
[your_program] Output bytes: [220 101 129 0 0 1 0 1 0 0 0 0 3 97 98 99 17 108 111 110 103 97 115 115 100 111 109 97 105 110 110 97 109 101 3 99 111 109 0 0 1 0 1]
[your_program] Transmitted Query of N bytes  43
[tester::#YC9] DNS query failed: read udp 127.0.0.1:34588->127.0.0.1:2053: i/o timeout.
[tester::#YC9] If you are seeing this after a while then it is likely that your server is not responding with appropriate id
[tester::#YC9] Test failed

And here’s a snippet of my code:

			// If resolver, we need to forward
			remoteUdpConn, _ := net.Dial("udp", ip)
			if len(resp.Questions) > 1 {
				// if more than 1 question, we need to split up
				fmt.Println("There are more than 1 questions!")
				fmt.Printf("%+v\n", resp.Questions)
				for _, ques := range resp.Questions {
					//iterate over questions
					//turn question into its own separate DNS query
					query := resp.AnswerFrom()
					query.Questions = []Question{ques}
					fmt.Printf("Iterating over %+v of %+v\n", query.Questions, resp.Questions)

					//fire off query and get back response
					size, err := remoteUdpConn.Write(query.ToBytes())
					fmt.Println("Transmitted Query of N bytes ", size)
					if err != nil {
						fmt.Println("failed to write to DNS! ", err)
					}
					buf := make([]byte, 512)
					size, err = remoteUdpConn.Read(buf)
					if err != nil {
						fmt.Println("Error on receiving ", err)
					}
					fmt.Printf("Recieved %d bytes back from %+v\n", size, remoteUdpConn.RemoteAddr().String())
					//parse response with ANSWER
				}

As you can see the code splits up a multi-question message into a separate message and transmits it, but never gets a response, instead it gets timed out. Is there a timing component to this test? Should I be doing the queries on a separat e thread vs the main thread?

2

I’ll take a look shortly.

3

Hi @hpca01, I tried running your code against the previous stages, but it’s no longer passing Stage #XM2 (Write answer section).

image
image1920×812 140 KB

Suggestions:

  1. Use our CLI to test against previous stages by running:
codecrafters test --previous
  1. Focus on fixing the early stages first, as later stages depend on them.
4

Thanks for the quick response, will go back and validate the prior section is working

1 Like
5

Closing this thread due to inactivity. If you still need assistance, feel free to reopen or start a new discussion!

6

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