DNS Server

The server houses a DNS recursive resolver and it is compatible with dig.

Handles the following types of records.

1. A
2. AAAA
3. NS
4. MX
5. CNAME

Reference

RFC 1034 RFC 1035

Quick start

1. You will need to have Rust installed. Download rustup.
2. clone the repo.
3. run cargo build && cargo run
4. run dig @127.0.0.1 -p 2053 google.com (if your are using powershell dig "@127.0.0.1" -p 2053 google.com)

Example

-> dig "@127.0.0.1" -p 2053 twitch.tv                                                                                                                                     
; <<>> DiG 9.16.26 <<>> @127.0.0.1 -p 2053 twitch.tv
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 53972
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 4, ADDITIONAL: 4

;; QUESTION SECTION:
;twitch.tv.                     IN      A

;; ANSWER SECTION:
twitch.tv.              3600    IN      A       151.101.130.167
twitch.tv.              3600    IN      A       151.101.66.167
twitch.tv.              3600    IN      A       151.101.2.167
twitch.tv.              3600    IN      A       151.101.194.167

;; AUTHORITY SECTION:
twitch.tv.              172800  IN      NS      ns-1450.awsdns-53.org.
twitch.tv.              172800  IN      NS      ns-1778.awsdns-30.co.uk.
twitch.tv.              172800  IN      NS      ns-219.awsdns-27.com.
twitch.tv.              172800  IN      NS      ns-664.awsdns-19.net.

;; Query time: 500 msec
;; SERVER: 127.0.0.1#2053(127.0.0.1)
;; WHEN: Mon May 16 15:46:05 India Standard Time 2022
;; MSG SIZE  rcvd: 303

Server side

    Finished dev [unoptimized + debuginfo] target(s) in 0.05s
     Running `target\debug\dns_server.exe`
Query = DnsQuestion { name: "twitch.tv", qtype: A }
Looking up A twitch.tv  with ns 198.41.0.4 
Looking up A twitch.tv  with ns 192.42.173.30 
Looking up A ns-219.awsdns-27.com  with ns 198.41.0.4 
Looking up A ns-219.awsdns-27.com  with ns 192.5.6.30 
Looking up A ns-219.awsdns-27.com  with ns 205.251.192.28 
Looking up A twitch.tv  with ns 205.251.192.219 
Answer: A { domain: "twitch.tv", addr: 151.101.130.167, ttl: 3600 } 
Answer: A { domain: "twitch.tv", addr: 151.101.66.167, ttl: 3600 } 
Answer: A { domain: "twitch.tv", addr: 151.101.2.167, ttl: 3600 }
Answer: A { domain: "twitch.tv", addr: 151.101.194.167, ttl: 3600 }
Authorities : NS { domain: "twitch.tv", host: "ns-1450.awsdns-53.org", ttl: 172800 }
Authorities : NS { domain: "twitch.tv", host: "ns-1778.awsdns-30.co.uk", ttl: 172800 }
Authorities : NS { domain: "twitch.tv", host: "ns-219.awsdns-27.com", ttl: 172800 }
Authorities : NS { domain: "twitch.tv", host: "ns-664.awsdns-19.net", ttl: 172800 }
Resource: UNKNOWN { domain: "", qtype: 0, data_len: 0, ttl: 0 }
Resource: UNKNOWN { domain: "", qtype: 0, data_len: 0, ttl: 0 }
Resource: UNKNOWN { domain: "", qtype: 0, data_len: 0, ttl: 0 }
Resource: UNKNOWN { domain: "", qtype: 0, data_len: 0, ttl: 0 }
Skipping record: UNKNOWN { domain: "", qtype: 0, data_len: 0, ttl: 0 }
Skipping record: UNKNOWN { domain: "", qtype: 0, data_len: 0, ttl: 0 }
Skipping record: UNKNOWN { domain: "", qtype: 0, data_len: 0, ttl: 0 }
Skipping record: UNKNOWN { domain: "", qtype: 0, data_len: 0, ttl: 0 } 

Documentation

run cargo doc --open