CodeCrafters
Build your own DNS server
Learn about the DNS protocol, record types, recursive resolve, forwarding servers and more.
This challenge is free to try when it's in beta. We keep challenges in beta for a few weeks to gather feedback.
In this challenge, you'll build a DNS server that's capable of parsing and creating DNS packets, responding to DNS queries, handling various record types and doing recursive resolve. Along the way we'll learn about the DNS protocol, DNS packet format, root servers, authoritative servers, forwarding servers, various record types (A, AAAA, CNAME, etc) and more.
Stages
Setup UDP server
Very easy
We'd expect a proficient developer to take < 5 minutes to complete this stage.
In this stage, we'll start a UDP server on port 2053.
Very easy
We'd expect a proficient developer to take < 5 minutes to complete this stage.
Write header section
Medium
We'd expect a proficient developer to take 30 minutes to 1 hour to complete this stage.
In this stage, we'll write a DNS packet's header contents
Medium
We'd expect a proficient developer to take 30 minutes to 1 hour to complete this stage.
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There are few sites I like as much that have a step by step guide. The real-time feedback is so good, it's creepy!
Ananthalakshmi Sankar
Automation Engineer at Apple
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I think the instant feedback right there in the git push is really cool.
Didn't even know that was possible!
Patrick Burris
Senior Software Developer, CenturyLink
Ananthalakshmi Sankar
Automation Engineer at Apple
“
I think the instant feedback right there in the git push is really cool.
Didn't even know that was possible!
Patrick Burris
Senior Software Developer, CenturyLink