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feat: initial poc

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Rick Rongen
2021-06-29 09:24:44 +02:00
commit be1d64337c
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.gitignore vendored Normal file
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# Created by https://www.toptal.com/developers/gitignore/api/python,pycharm+all
# Edit at https://www.toptal.com/developers/gitignore?templates=python,pycharm+all
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# Gradle
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# since they will be recreated, and may cause churn. Uncomment if using
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# .idea/artifacts
# .idea/compiler.xml
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Pipfile Normal file
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[[source]]
url = "https://pypi.org/simple"
verify_ssl = true
name = "pypi"
[packages]
dnslib = ">=0.9.16"
docker = ">=5.0.0"
six = ">=1.16.0"
[dev-packages]
[requires]
python_version = "3.9"

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Pipfile.lock generated Normal file
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{
"_meta": {
"hash": {
"sha256": "5151ef4ebe6e261f875923c3884de8137a338ff6658d0c6bee3230318a477cf2"
},
"pipfile-spec": 6,
"requires": {
"python_version": "3.9"
},
"sources": [
{
"name": "pypi",
"url": "https://pypi.org/simple",
"verify_ssl": true
}
]
},
"default": {
"certifi": {
"hashes": [
"sha256:2bbf76fd432960138b3ef6dda3dde0544f27cbf8546c458e60baf371917ba9ee",
"sha256:50b1e4f8446b06f41be7dd6338db18e0990601dce795c2b1686458aa7e8fa7d8"
],
"version": "==2021.5.30"
},
"chardet": {
"hashes": [
"sha256:0d6f53a15db4120f2b08c94f11e7d93d2c911ee118b6b30a04ec3ee8310179fa",
"sha256:f864054d66fd9118f2e67044ac8981a54775ec5b67aed0441892edb553d21da5"
],
"markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
"version": "==4.0.0"
},
"dnslib": {
"hashes": [
"sha256:2d66b43d563d60c469117c8cb615843e7d05bf8fb2e6cb00a637281d26b7ec7d",
"sha256:87dd634ce2349ced88fa5e50848d34b57569f99b4a542f72b9314d1e72fabf95"
],
"index": "pypi",
"version": "==0.9.16"
},
"docker": {
"hashes": [
"sha256:3e8bc47534e0ca9331d72c32f2881bb13b93ded0bcdeab3c833fb7cf61c0a9a5",
"sha256:fc961d622160e8021c10d1bcabc388c57d55fb1f917175afbe24af442e6879bd"
],
"index": "pypi",
"version": "==5.0.0"
},
"idna": {
"hashes": [
"sha256:b307872f855b18632ce0c21c5e45be78c0ea7ae4c15c828c20788b26921eb3f6",
"sha256:b97d804b1e9b523befed77c48dacec60e6dcb0b5391d57af6a65a312a90648c0"
],
"markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
"version": "==2.10"
},
"requests": {
"hashes": [
"sha256:27973dd4a904a4f13b263a19c866c13b92a39ed1c964655f025f3f8d3d75b804",
"sha256:c210084e36a42ae6b9219e00e48287def368a26d03a048ddad7bfee44f75871e"
],
"markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
"version": "==2.25.1"
},
"six": {
"hashes": [
"sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926",
"sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"
],
"index": "pypi",
"version": "==1.16.0"
},
"urllib3": {
"hashes": [
"sha256:39fb8672126159acb139a7718dd10806104dec1e2f0f6c88aab05d17df10c8d4",
"sha256:f57b4c16c62fa2760b7e3d97c35b255512fb6b59a259730f36ba32ce9f8e342f"
],
"markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4' and python_version < '4'",
"version": "==1.26.6"
},
"websocket-client": {
"hashes": [
"sha256:b68e4959d704768fa20e35c9d508c8dc2bbc041fd8d267c0d7345cffe2824568",
"sha256:e5c333bfa9fa739538b652b6f8c8fc2559f1d364243c8a689d7c0e1d41c2e611"
],
"markers": "python_version >= '3.6'",
"version": "==1.1.0"
}
},
"develop": {}
}

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import time
from docker import DockerClient
from dnslib import DNSRecord, QTYPE, RCODE, RR, A
from dnslib.server import BaseResolver, DNSServer, DNSLogger, DNSHandler
class DockerResolver(BaseResolver):
def __init__(self):
self.docker_client = DockerClient()
def resolve(self, request: DNSRecord, handler):
reply = request.reply()
if not request.q.qname.matchGlob('*.docker'):
reply.header.rcode = getattr(RCODE, 'NXDOMAIN')
return reply
service, *_ = str(request.q.qname).split('.')
results = self.docker_client.containers.list(filters={'name': service})
if not results or len(results) == 0:
reply.header.rcode = getattr(RCODE, 'NXDOMAIN')
return reply
container = results[0]
networks = container.attrs['NetworkSettings']['Networks']
ip = None
for net_name, network in networks.items():
ip = network['IPAddress']
break
if ip is not None:
reply.add_answer(RR(rname=request.q.qname, rtype=getattr(QTYPE, 'A'), rclass=1, ttl=60*5, rdata=A(ip)))
return reply
def main():
resolver = DockerResolver()
logger = DNSLogger('request,reply,truncated,error', False)
DNSHandler.log = {
'log_request', # DNS Request
'log_reply', # DNS Response
'log_truncated', # Truncated
'log_error', # Decoding error
}
udp_server = DNSServer(
resolver,
port=1053,
address='127.0.0.1',
logger=logger,
)
tcp_server = DNSServer(
resolver,
port=1053,
address='127.0.0.1',
logger=logger,
)
udp_server.start_thread()
tcp_server.start_thread()
print("listening")
while udp_server.isAlive() or tcp_server.isAlive():
time.sleep(1)
if __name__ == '__main__':
main()