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https://github.com/belyalov/tinydns

Very simple DNS async server for micropython
https://github.com/belyalov/tinydns

dns dns-server micropython tinydns

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Very simple DNS async server for micropython

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## TinyDNS [![Build Status](https://travis-ci.org/belyalov/tinydns.svg?branch=master)](https://travis-ci.org/belyalov/tinydns)

Simple and lightweight (thus - *tiny*) DNS server for tiny devices like **ESP8266** / **ESP32** running [micropython](https://github.com/micropython/micropython).

Sometimes people needs very simple DNS just to server a few domains.

For example - very common use case is **captive portal**



### Features

* Fully asynchronous using [uasyncio](https://github.com/micropython/micropython-lib/tree/master/uasyncio) library for MicroPython.

* *Tiny* memory usage. So you can run it on devices like **ESP8266 / ESP32** with 64K/96K of RAM onboard.

* Great unittest coverage. So you can be confident about quality :)



### Requirements

* [uasyncio](https://github.com/micropython/micropython-lib/tree/master/uasyncio) - micropython version of *async* library for big brother - python3.

* [uasyncio-core](https://github.com/micropython/micropython-lib/tree/master/uasyncio.core)



### Quickstart

TinyDNS comes as a compiled firmware for ESP8266 / ESP32 as well ("frozen modules"). You don't have to use it - however, it could be easiest way to try it :)

Instructions below are tested with *NodeMCU* devices. For your device instructions could be slightly different, so keep in mind.

**CAUTION**: If you proceed with installation all data on your device will **lost**!



#### Installation - ESP8266

* Download latest `firmware_esp8266.bin` from [releases](https://github.com/belyalov/tinydns/releases).

* Install `esp-tool` if you haven't done already: `pip install esptool`

* Erase flash: `esptool.py --port  --baud 115200 erase_flash`

* Flash firmware: `esptool.py --port  --baud 115200 write_flash -fm dio 0 firmware_esp8266.bin`



#### Installation - ESP32

* Download latest `firmware_esp32.bin` from [releases](https://github.com/belyalov/tinydns/releases).

* Install `esp-tool` if you haven't done already: `pip install esptool`

* Erase flash: `esptool.py --port  --baud 115200 erase_flash`

* Flash firmware: `esptool.py --port  --baud 115200 write_flash -fm dio 0x1000 firmware_esp32.bin`



#### Let's code

Coming very soon!



### Limitation / Known issues

* UDP only

* IPv4 only (therefore only **A** queries)

* Simple DNS requests only: 1 DNS query per packet (99% of DNS requests)



### Reference

#### class `Server`

* `__init__(self, domains={}, ttl=10, max_pkt_len=512, ignore_unknown=False)` - create `tinydns` server instance.

    * `domains` - **dict** of domains to resolve - *domain* -> *IPv4*. E.g. `{'my.com': '192.168.1.1', 'yep.com': '127.0.0.1'}`

    * `ttl` - Response TimeToLive, i.e. how long answer can be stored in the cache.

    * `max_pkt_len` - Maximum UDP packet length to serve. Due to memory constrained devices it is good to restrict datagram size.

    * `ignore_unknown` - Controls behavior for *unknown domain* case. If turned on - no error response will be generated.



* `add_domain(self, domain, ip)` - add `domain` to resolved to `ip`. All parameters are `str`.



* `run(self, host='127.0.0.1', port=53)` - run DNS server. Because of *tinydns* is fully async server and assumption here is you're running it as a part of some main application so it **will not** call `loop_forever()`.

    * `host` - host to listen on

    * `port` - port to listen on



More documentation and examples coming soon! :)