Asynchronous DNS client and server
Project description
async_dns
Asynchronous DNS server and client built with pure Python.
Requirements: Python >=3.6
Installation
$ pip3 install async_dns
# or
$ pip3 install git+https://github.com/gera2ld/async_dns.git
CLI
Resolver
usage: python3 -m async_dns.resolver [-h] [-n NAMESERVERS [NAMESERVERS ...]] [-t TYPES [TYPES ...]]
hostnames [hostnames ...]
Async DNS resolver
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:
# Resolve an IP
$ python3 -m async_dns.resolver www.google.com
$ python3 -m async_dns.resolver -t mx -- gmail.com
# Query via TCP
$ python3 -m async_dns.resolver -n tcp://127.0.0.1 www.google.com
# Query from non-standard ports
$ python3 -m async_dns.resolver -n udp://127.0.0.1:1053 www.google.com
Server
usage: python3 -m async_dns.server [-h] [-b BIND] [--hosts HOSTS] [-x [PROXY [PROXY ...]]]
DNS server by Gerald.
optional arguments:
-h, --help show this help message and exit
-b BIND, --bind BIND the address for the server to bind
--hosts HOSTS the path of a hosts file, `none` to disable hosts, `local` to read from
local hosts file
-x [PROXY [PROXY ...]], --proxy [PROXY [PROXY ...]]
the proxy DNS servers, `none` to serve as a recursive server, `default` to
proxy to default nameservers
Examples:
# Start a DNS proxy server on :53
$ python3 -m async_dns.server -b :53 --hosts /etc/hosts
# Start a DNS server over TCP proxy
$ python3 -m async_dns.server -x tcp://114.114.114.114
# Start a DNS recursive server
$ python3 -m async_dns.server -x none
API
import asyncio
from async_dns import types
from async_dns.resolver import ProxyResolver
loop = asyncio.get_event_loop()
resolver = ProxyResolver()
res = loop.run_until_complete(resolver.query('www.baidu.com', types.A))
print(res)
ProxyResolver supports routing based on domains:
resolver = ProxyResolver(proxies=[
('*.lan', ['192.168.1.1']), # query 'udp://192.168.1.1:53' for '*.lan' domains
(lambda d: d.endswith('.local'), ['tcp://127.0.0.1']), # query tcp://127.0.0.1:53 for domains ending with '.local'
'8.8.8.8', # equivalent to (None, ['8.8.8.8']), matches all others
])
Test
$ python3 -m unittest
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