RDNS: Rust DNS

This is a toy implmentation of a DNS resolver based on RFC 1035. During the implementation, I loosely followed and referenced Julia Evans' tutorial Implement DNS in a Weekend. The final output of the program is modelled after the output of the dig utility.

Usage

The basic usage of the resolver is as follows where <domain-name> is a valid domain name according to RFC 1035 2.3.1:

rdns <domain-name>

The user can also specify the DNS server used to query from as follows where <server-ip> is a valid IPV4 address:

rdns @<server-ip> <domain-name>

RDATA formats supported

• A
• NS
• MD
• MF
• CNAME
• SOA
• MB
• MG
• MR
• NULL
• WKS
• PTR
• HINFO
• MINFO
• MX
• TXT
• AAAA (RFC 1886)

Todos

• Basic domain name resolution
• Request timeouts
• Caching
• Rich cli experience
  • Selection of query type and class from cli
  • Allowing multiple DNS servers to be specified from the cli