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Toy implementation of Domain Name System (DNS)

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rokkerruslan/dnska

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Quickstart

Ensure that you have installed Gohttps://go.dev/doc/manage-install

$ ./scripts/app.sh install$ dnska version

Try to use stub resolver:

$ dnska lookup --only-answer example.com([]dnska.ResourceRecord) (len=1 cap=1) { (dnska.ResourceRecord) {  Name: (string) (len=11) "example.com",  Type: (dnska.QType) QTypeA,  Class: (dnska.QClass) ClassIN,  TTL: (uint32) 71124,  RDLength: (uint16) 4,  RData: (string) (len=13) "93.184.216.34" }}

Try to run proxy name server:

$ sudo dnska app# And into another terminal:$ dnska lookup --addr :2053 --type 28 --only-answer example.com([]dnska.ResourceRecord) (len=1 cap=1) { (dnska.ResourceRecord) {  Name: (string) (len=11) "example.com",  Type: (dnska.QType) QTypeAAAA,  Class: (dnska.QClass) ClassIN,  TTL: (uint32) 14522,  RDLength: (uint16) 16,  RData: (string) (len=39) "2606:2800:0220:0001:0248:1893:25c8:1946" }}

Encoding and decoding DNS packets:

$ dnska encode [FILENAME]$ dnska decode [FILENAME]

Todo

  • Caching name server.
  • Recursive resolving.
  • Loading zones and working as authoritative name server.

RFCs

The DNS has a lot of RFC for describing its own features. Belowis a list of RFCs that I leant upon.

  • DOMAIN NAMES - CONCEPTS AND FACILITIESRFC1035

  • DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATIONRFC1035

    Base documents about DNS design. Not all record formats are supported. Currently, only:

    • A
    • CNAME
  • DNS Extensions to Support IP Version 6RFC2396

    Introduce the AAAA record type.

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