https://github.com/cirocosta/rawdns

A records resolver from scratch - raw UDP packets
https://github.com/cirocosta/rawdns

dns go golang name-resolution networking

Last synced: about 2 hours ago
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A records resolver from scratch - raw UDP packets

• Host: GitHub
• URL: https://github.com/cirocosta/rawdns
• Owner: cirocosta
• License: mit
• Created: 2017-12-29T13:04:39.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2019-12-13T19:43:55.000Z (almost 5 years ago)
• Last Synced: 2024-06-19T00:29:58.216Z (4 months ago)
• Topics: dns, go, golang, name-resolution, networking
• Language: Go
• Homepage: https://ops.tips/blog/raw-dns-resolver-in-go/
• Size: 21.5 KB
• Stars: 21
• Watchers: 5
• Forks: 3
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
rawdns 📡  


DNS messages (un)marshaller and UDP client





### Overview

`rawdns` a small DNS client library that performs A records queries against a given nameserver. 

It relies only on `net` to perform the UDP queries, constructing and parsing all the messages in transit manually.

This is a project that is **not** intended to be used in production **at all**. It's not as efficient as it should and does not handle all the cases you'd expect from a production-ready library.

For real use, see [miekg/dns](https://github.com/miekg/dns).

### Usage

CLI:

```sh

rawdns example.com

msg sent labels=[example com]

&{ID:0 QR:1 Opcode:0 AA:0 TC:0 RD:1 RA:1 Z:0 RCODE:0 QDCOUNT:1 ANCOUNT:1 NSCOUNT:0 ARCOUNT:0}

ANSWER: [93 184 216 34]

```

Programatically:

```go

import "github.com/cirocosta/rawdns/lib"

client, err := lib.NewClient(lib.ClientConfig{

        Address: "8.8.8.8:53",

})

must(err)

defer client.Close()

ips, err := client.LookupAddr("example.com")

must(err)

for _, ip := range ips {

        fmt.Println(ip)

}

```