doggo/README.md

<!-- PROJECT LOGO -->
<br />
<p align="center">
  <h2 align="center">doggo</h2>
  <p align="center">
    🐶 <i>Command-line DNS client for humans</i>
    <br/>
    <a href="https://doggo.mrkaran.dev">doggo.mrkaran.dev</a>
  </p>
  <img src="www/static/doggo.png" alt="doggo CLI usage">
</p>

---

**doggo** is a modern command-line DNS client (like _dig_) written in Golang. It outputs information in a neat concise manner and supports protocols like DoH, DoT and DNSCrypt as well.

It's totally inspired from [dog](https://github.com/ogham/dog/) which is written in Rust. I wanted to add some features to it but since I don't know Rust, I found it as a nice opportunity
to experiment with writing a DNS Client from scratch in `Go` myself. Hence the name `dog` +`go` => **doggo**.

## Features

- Human readable output - supports **colors** and **tabular** format.
- Supports **JSON** format - can be useful while writing scripts.
- Has support for multiple transport protocols:
  - DNS over **HTTPS** (DoH)
  - DNS over **TLS** (DoT)
  - DNS over **TCP**
  - DNS over **UDP**
  - DNS over **DNSCrypt**
- Supports **ndots** and **search** configurations from `resolv.conf` or command-line arguments.
- Supports multiple resolvers at once.
- Supports IPv4 **and** IPv6 _both_.
- Available as a web tool as well: [https://doggo.mrkaran.dev](https://doggo.mrkaran.dev).
- Shell completions for `zsh` and `fish`.
- Reverse DNS Lookups.

## Installation

### Binary

You can grab the latest binaries for Linux, MacOS and Windows from the [Releases](https://github.com/mr-karan/doggo/releases) section.

For eg, to pull the latest `linux-amd64` binary:

```shell
$ cd "$(mktemp -d)"
$ curl -sL "https://github.com/mr-karan/doggo/releases/download/v0.3.7/doggo_0.3.7_linux_amd64.tar.gz" | tar xz
$ mv doggo /usr/local/bin
# doggo should be available now in your $PATH
$ doggo
```
### Docker

Images are hosted on Github Container Registry (ghcr.io).
You can view all the tags [here](https://github.com/users/mr-karan/packages/container/package/doggo). It even supports **ARM** so you can spin up a container on your RPi to do DNS lookups, cause why not.

**Pull**

`docker pull ghcr.io/mr-karan/doggo:latest`

**Running**

You can supply all arguments to the CLI directly to `docker run` command. Eg:

`docker run ghcr.io/mr-karan/doggo:latest mrkaran.dev @1.1.1.1 MX`

### Package Managers

#### Homebrew

Install via [Homebrew](https://brew.sh/)

```bash
$ brew install doggo
```

#### Arch

```bash
yay -S doggo-bin
```

### From Source

You need to have `go` installed in your system.

```bash
$ go install github.com/mr-karan/doggo/cmd/doggo@latest
```

The binary will be available at `$GOPATH/bin/doggo`.

## Usage Examples

**Do a simple DNS Lookup for `mrkaran.dev`**

```bash
$ doggo mrkaran.dev                                                                         
NAME            TYPE    CLASS   TTL     ADDRESS         NAMESERVER   
mrkaran.dev.    A       IN      20s     13.250.205.9    127.0.0.1:53
mrkaran.dev.    A       IN      20s     206.189.89.118  127.0.0.1:53
```

**Query MX records for `github.com` using `9.9.9.9` resolver**

```
doggo MX github.com @9.9.9.9
NAME            TYPE    CLASS   TTL     ADDRESS                         NAMESERVER 
github.com.     MX      IN      3600s   10 alt3.aspmx.l.google.com.     9.9.9.9:53
github.com.     MX      IN      3600s   5 alt1.aspmx.l.google.com.      9.9.9.9:53
github.com.     MX      IN      3600s   10 alt4.aspmx.l.google.com.     9.9.9.9:53
github.com.     MX      IN      3600s   5 alt2.aspmx.l.google.com.      9.9.9.9:53
github.com.     MX      IN      3600s   1 aspmx.l.google.com.           9.9.9.9:53
```

or using _named parameters_:

```bash
$ doggo -t MX -n 9.9.9.9 github.com
NAME            TYPE    CLASS   TTL     ADDRESS                         NAMESERVER 
github.com.     MX      IN      3600s   10 alt3.aspmx.l.google.com.     9.9.9.9:53
github.com.     MX      IN      3600s   5 alt1.aspmx.l.google.com.      9.9.9.9:53
github.com.     MX      IN      3600s   10 alt4.aspmx.l.google.com.     9.9.9.9:53
github.com.     MX      IN      3600s   5 alt2.aspmx.l.google.com.      9.9.9.9:53
github.com.     MX      IN      3600s   1 aspmx.l.google.com.           9.9.9.9:53
```

**Query DNS records for `archive.org` using Cloudflare DoH resolver**

```bash
$ doggo archive.org @https://cloudflare-dns.com/dns-query 
NAME            TYPE    CLASS   TTL     ADDRESS         NAMESERVER                           
archive.org.    A       IN      41s     207.241.224.2   https://cloudflare-dns.com/dns-query
```

**Query DNS records for `internetfreedom.in` with JSON output**

```bash
$ doggo internetfreedom.in --json | jq
{
  "responses": {
    "answers": [
      {
        "name": "internetfreedom.in.",
        "type": "A",
        "class": "IN",
        "ttl": "22s",
        "address": "104.27.158.96",
        "rtt": "37ms",
        "nameserver": "127.0.0.1:53"
      },
      {
        "name": "internetfreedom.in.",
        "type": "A",
        "class": "IN",
        "ttl": "22s",
        "address": "104.27.159.96",
        "rtt": "37ms",
        "nameserver": "127.0.0.1:53"
      },
      {
        "name": "internetfreedom.in.",
        "type": "A",
        "class": "IN",
        "ttl": "22s",
        "address": "172.67.202.77",
        "rtt": "37ms",
        "nameserver": "127.0.0.1:53"
      }
    ],
    "queries": [
      {
        "name": "internetfreedom.in.",
        "type": "A",
        "class": "IN"
      }
    ]
  }
}
```

**Query DNS records for `duckduckgo.com` and show RTT (Round Trip Time)**

```bash
$ doggo duckduckgo.com --time                
NAME            TYPE    CLASS   TTL     ADDRESS         NAMESERVER      TIME TAKEN 
duckduckgo.com. A       IN      30s     40.81.94.43     127.0.0.1:53    45ms      
```

## Command-line Arguments

![](www/static/help.png)

### Transport Options

URL scheme of the server is used to identify which resolver to use for lookups. If no scheme is specified, defaults to `udp`.

```
  @udp://        eg: @1.1.1.1 initiates a UDP resolver for 1.1.1.1:53.
  @tcp://        eg: @1.1.1.1 initiates a TCP resolver for 1.1.1.1:53.
  @https://      eg: @https://cloudflare-dns.com/dns-query initiates a DOH resolver for Cloudflare DoH server.
  @tls://        eg: @1.1.1.1 initiates a DoT resolver for 1.1.1.1:853.
  @sdns://       eg: @sdns://AgcAAAAAAAAABzEuMC4wLjEAEmRucy5jbG91ZGZsYXJlLmNvbQovZG5zLXF1ZXJ5
                 initiates a DNSCrypt or DoH resolver using its DNS stamp.
  @quic://       eg: @quic://dns.adguard.com
                 initiates a DNS over QUIC resolver for Adguard DNS Resolver.
```

### Query Options

```
  -q, --query=HOSTNAME        Hostname to query the DNS records for (eg mrkaran.dev).
  -t, --type=TYPE             Type of the DNS Record (A, MX, NS etc).
  -n, --nameserver=ADDR       Address of a specific nameserver to send queries to (9.9.9.9, 8.8.8.8 etc).
  -c, --class=CLASS           Network class of the DNS record (IN, CH, HS etc).
```

### Resolver Options

```
  --strategy=STRATEGY           Specify strategy to query nameserver listed in etc/resolv.conf. Defaults to `all` (`random`, `first`, `all`).
  --ndots=INT                   Specify ndots parameter. Takes value from /etc/resolv.conf if using the system nameserver or 1 otherwise.
  --search                      Use the search list defined in resolv.conf. Defaults to true. Set --search=false to disable search list.
  --timeout                     Specify timeout (in seconds) for the resolver to return a response.
  -4 --ipv4                     Use IPv4 only.
  -6 --ipv6                     Use IPv6 only.
  --tls-hostname=HOSTNAME       Provide a hostname for doing verification of the certificate if the provided DoT nameserver is an IP.
  --skip-hostname-verification  Skip TLS Hostname Verification in case of DOT Lookups.
```


### Output Options

```
  -J, --json                  Format the output as JSON.
  --color                     Defaults to true. Set --color=false to disable colored output.
  --debug                     Enable debug logging.
  --time                      Shows how long the response took from the server.
  --short                     Short output format. Shows only the response section.
```

---

## Contributing

I'm open to accept feature requests and/or issues. I understand `doggo` is a new DNS Client in the town and there might be some edge cases I am not handling.
Please feel free to open issues if you ever come across such a case.
For now I am focussing more on [planned features](TODO.md) for a **stable** v1.0 release _soon_.

## License

Copyright (C) 2022 mr-karan

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.