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A toy DNS resolver written in Rust
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aryan9600/dns-resolver
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dns-resolver is a toy DNS resolver. It can handle A, NS, CNAME and TXT records.Its a recursive resolver that can be used as DNS client or server. The server supportscaching via a fixed size LRU cache.
It's mainly written by understanding the contents ofhttps://implement-dns.wizardzines.com/book/intro.htmlandhttps://datatracker.ietf.org/doc/html/rfc1035. The primary goal of this projectis to understand how DNS works from the ground up and brush up on my Rust skills.
Fetch the A records for google.com:
❯ cargo run --bin client google.com AQuerying 198.41.0.4for google.com about recordtype AQuerying 192.12.94.30for google.com about recordtype AQuerying 216.239.34.10for google.com about recordtype Aanswer(s): ["142.250.76.174"]
Fetch the CNAME records forwww.github.com:
❯ cargo run --bin client www.github.com CNAMEQuerying 198.41.0.4for www.github.com about recordtype CNAMEQuerying 192.12.94.30for www.github.com about recordtype CNAMEQuerying 205.251.193.165for www.github.com about recordtype CNAMEanswer(s): ["github.com"]
Run the server:
❯ cargo run --bin server
Open another terminal window and usedig to access the server:
❯ dig @127.0.0.1 -p 3500 google.com A;<<>> DiG 9.10.6 <<>> @127.0.0.1 -p 3500 google.com A; (1 server found);; global options: +cmd;; Got answer:;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34233;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0;; QUESTION SECTION:;google.com. IN A;; ANSWER SECTION:google.com. 300 IN A 142.250.67.206;; Query time: 305 msec;; SERVER: 127.0.0.1#3500(127.0.0.1);; WHEN: Mon Jan 08 01:37:32 IST 2024;; MSG SIZE rcvd: 44