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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright (c) 2017 Cisco and/or its affiliates.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import ipaddress
import logging
from string import Template
from netmodel.model.type import String, Bool
from vicn.core.attribute import Attribute
from vicn.core.resource import EmptyResource
from vicn.resource.dns_server import DnsServer
from vicn.resource.interface import Interface
from vicn.resource.linux.file import TextFile
from vicn.resource.linux.service import Service
log = logging.getLogger(__name__)
FN_CONF='/etc/dnsmasq.conf'
TPL_CONF='''
# Configuration file for dnsmasq.
#
# Format is one option per line, legal options are the same
# as the long options legal on the command line. See
# "/usr/sbin/dnsmasq --help" or "man 8 dnsmasq" for details.
interface=$interface
dhcp-range=$dhcp_range
dhcp-host=00:0e:c6:81:79:01,192.168.128.200,12h
#server=$server
$flags
'''
DHCP_OFFSET = 195
class DnsMasq(Service, DnsServer):
"""
Todo:
- Currently, a single interface is supported.
- DHCP range is hardcoded
"""
__package_names__ = ['dnsmasq']
__service_name__ = 'dnsmasq'
interface = Attribute(Interface,
description = 'Interface on which to listen')
lease_interval = Attribute(String,
default = '12h')
server = Attribute(String)
dhcp_authoritative = Attribute(Bool,
description = 'Flag: DHCP authoritative',
default = True)
log_queries = Attribute(Bool, description = 'Flag: log DNS queries',
default = True)
log_dhcp = Attribute(Bool, description = 'Flag: log DHCP queries',
default = True)
#--------------------------------------------------------------------------
# Resource lifecycle
#--------------------------------------------------------------------------
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
if not self.interface:
if self.node.bridge:
self.interface = self.node.bridge
else:
self.interface = self.node.host_interface
def __subresources__(self):
# Overwrite configuration file
flags = list()
if self.dhcp_authoritative:
flags.append('dhcp-authoritative')
if self.log_queries:
flags.append('log-queries')
if self.log_dhcp:
flags.append('log-dhcp')
network = self._state.manager.get('network')
network = ipaddress.ip_network(network, strict=False)
dhcp_range = '{},{},{},{},{}'.format(
self.interface.device_name,
str(network[DHCP_OFFSET]),
str(network[DHCP_OFFSET + 5]), # eg. .253
"255.255.255.0",
self.lease_interval)
t_dict = {
'interface' : self.interface.device_name,
'dhcp_range': dhcp_range,
'server' : str(network[-2]), # unused so far
'flags' : '\n'.join(flags)
}
t = Template(TPL_CONF)
conf = t.substitute(t_dict)
return TextFile(node = self.node, owner = self, filename = FN_CONF,
content = conf, overwrite = True)
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