async-doh

async-doh

DNS over HTTPS based on aiohttp and async_dns.

Installation

$ pip install async-doh

Usage

Command-line

usage: python3 -m async_doh.client [-h] [-n NAMESERVERS [NAMESERVERS ...]] [-t TYPES [TYPES ...]] hostnames [hostnames ...]

Async DNS resolver with DoH

positional arguments:
  hostnames             the hostnames to query

optional arguments:
  -h, --help            show this help message and exit
  -n NAMESERVERS [NAMESERVERS ...], --nameservers NAMESERVERS [NAMESERVERS ...]
                        name servers
  -t TYPES [TYPES ...], --types TYPES [TYPES ...]
                        query types, default as `any`

Examples:

$ python3 -m async_doh.client -n https://223.5.5.5/dns-query -t ANY -- www.google.com

Client

import asyncio
import aiohttp
from async_doh.client import DoHClient

async def main():
    async with DoHClient() as client:
        result = await client.query('https://1.1.1.1/dns-query', 'www.google.com', 'A')
        print('query:', result)
        result = await client.query_json('https://1.1.1.1/dns-query', 'www.google.com', 'A')
        print('query_json:', result)

asyncio.run(main())

Server

from aiohttp import web
from async_doh.server import application

web.run(application)

Now you have http://localhost:8080/dns-query as an endpoint.

Patching async_dns

By importing the patch, async_dns will use aiohttp to send queries through HTTPS (aka DNS over HTTPS):

import asyncio
from async_dns.core import types
from async_dns.resolver import ProxyResolver
from async_doh.client import patch

async def main():
    revoke = await patch()
    resolver = ProxyResolver(proxies=['https://dns.alidns.com/dns-query'])
    res, _ = await resolver.query('www.google.com', types.A)
    print(res)
    await revoke()

asyncio.run(main())

References

• https://tools.ietf.org/html/rfc8484