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#!/usr/bin/python
# Copyright 2016 Google Inc. All Rights Reserved.
#
# 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.
"""Enables the network interfaces provided in metadata."""
import logging.handlers
import optparse
import subprocess
from google_compute_engine import config_manager
from google_compute_engine import logger
from google_compute_engine import metadata_watcher
from google_compute_engine import network_utils
class NetworkSetup(object):
"""Enable network interfaces specified by metadata."""
network_interfaces = 'instance/network-interfaces'
def __init__(self, dhcp_binary=None, debug=False):
"""Constructor.
Args:
dhcp_binary: string, an executable to enable an ethernet interface.
debug: bool, True if debug output should write to the console.
"""
self.dhcp_binary = dhcp_binary or 'dhclient'
facility = logging.handlers.SysLogHandler.LOG_DAEMON
self.logger = logger.Logger(
name='network-setup', debug=debug, facility=facility)
self.watcher = metadata_watcher.MetadataWatcher(logger=self.logger)
self.network_utils = network_utils.NetworkUtils(logger=self.logger)
self._SetupNetworkInterfaces()
def _EnableNetworkInterface(self, interface):
"""Enable the network interface.
Args:
interface: string, the output device to enable.
"""
if self.network_utils.IsEnabled(interface):
return
command = [self.dhcp_binary, interface]
try:
self.logger.info('Enabling the ethernet interface %s.', interface)
subprocess.check_call(command)
except subprocess.CalledProcessError:
self.logger.warning('Could not enable the interface %s.', interface)
def _SetupNetworkInterfaces(self):
"""Get network interfaces metadata and enable each ethernet interface."""
result = self.watcher.GetMetadata(
metadata_key=self.network_interfaces, recursive=True)
for network_interface in result:
mac_address = network_interface.get('mac')
interface = self.network_utils.GetNetworkInterface(mac_address)
if interface:
self._EnableNetworkInterface(interface)
else:
message = 'Network interface not found for MAC address: %s.'
self.logger.warning(message, mac_address)
def main():
parser = optparse.OptionParser()
parser.add_option(
'-d', '--debug', action='store_true', dest='debug',
help='print debug output to the console.')
(options, _) = parser.parse_args()
instance_config = config_manager.ConfigManager()
if instance_config.GetOptionBool('NetworkInterfaces', 'setup'):
NetworkSetup(
dhcp_binary=instance_config.GetOptionString(
'NetworkInterfaces', 'dhcp_binary'),
debug=bool(options.debug))
if __name__ == '__main__':
main()
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