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115 lines
4.3 KiB
Python
115 lines
4.3 KiB
Python
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# -*- coding: utf-8 -*-
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from __future__ import print_function
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try:
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from subprocess import getoutput
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except ImportError:
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from commands import getoutput
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from dnslib import RR,QTYPE,RCODE,A,parse_time
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from dnslib.label import DNSLabel
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from dnslib.server import DNSServer,DNSHandler,BaseResolver,DNSLogger
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from docker import Client, errors
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class DockerResolver(BaseResolver):
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"""
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"""
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def __init__(self, docker='unix://var/run/docker.sock',
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origin='docker', ttl='60s'):
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self.client = Client(base_url=docker)
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self.origin = DNSLabel(origin)
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self.ttl = parse_time(ttl)
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def resolve(self,request,handler):
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reply = request.reply()
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qname = request.q.qname
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print("Queried: %s" % qname)
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print("Label: %s" % self.origin)
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found = False
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if not qname.matchSuffix(self.origin):
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print("Not the %s domain" % self.origin)
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return reply
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cname = "/" + str(qname.stripSuffix(self.origin))[:-1].replace("/", "_")
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try:
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for c in self.client.containers():
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if cname in c["Names"]:
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container = self.client.inspect_container(c["Id"])
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ns = container.get("NetworkSettings", {})
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if ns:
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address = ns.get("IPAddress", None)
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print("Found %s [%s]" % (cname, address))
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if address:
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reply.add_answer(RR(qname,QTYPE.A,ttl=self.ttl,
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rdata=A(address)))
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else:
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print("Found %s - NO IP" % cname)
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found = True
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break
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if not found:
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print("Container not found: %s" % cname)
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except Exception as ex:
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print("Error occurred querying [%s]: %s" % (cname, ex))
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return reply
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if __name__ == '__main__':
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import argparse,sys,time
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p = argparse.ArgumentParser(description="Docker DNS Resolver")
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p.add_argument("--docker","-d",default="unix://var/run/docker.sock",
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metavar="<url>",
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help="Docker Socket/URL (default: unix://var/run/docker.sock)")
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p.add_argument("--origin","-o",default="docker",
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metavar="<origin>",
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help="Origin domain label (default: .)")
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p.add_argument("--ttl","-t",default="60s",
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metavar="<ttl>",
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help="Response TTL (default: 60s)")
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p.add_argument("--port","-p",type=int,default=53,
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metavar="<port>",
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help="Server port (default:53)")
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p.add_argument("--address","-a",default="",
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metavar="<address>",
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help="Listen address (default:all)")
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p.add_argument("--udplen","-u",type=int,default=0,
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metavar="<udplen>",
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help="Max UDP packet length (default:0)")
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p.add_argument("--tcp",action='store_true',default=False,
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help="TCP server (default: UDP only)")
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p.add_argument("--log",default="request,reply,truncated,error",
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help="Log hooks to enable (default: +request,+reply,+truncated,+error,-recv,-send,-data)")
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p.add_argument("--log-prefix",action='store_true',default=False,
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help="Log prefix (timestamp/handler/resolver) (default: False)")
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args = p.parse_args()
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resolver = DockerResolver(docker=args.docker, origin=args.origin, ttl=args.ttl)
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logger = DNSLogger(args.log,args.log_prefix)
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print("Starting Docker Resolver for %s (%s:%d) [%s]" % (
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args.docker,
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args.address or "*",
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args.port,
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"UDP/TCP" if args.tcp else "UDP"))
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if args.udplen:
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DNSHandler.udplen = args.udplen
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udp_server = DNSServer(resolver,
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port=args.port,
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address=args.address,
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logger=logger)
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udp_server.start_thread()
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if args.tcp:
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tcp_server = DNSServer(resolver,
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port=args.port,
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address=args.address,
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tcp=True,
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logger=logger)
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tcp_server.start_thread()
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while udp_server.isAlive():
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time.sleep(1)
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