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#!/usr/bin/python
# Copyright 2018 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.
"""Manage networking on a Google Compute Engine instance.
Run network setup to enable multiple network interfaces on startup.
Update IP forwarding when metadata changes.
"""
import logging.handlers
import optparse
import random
import socket
from google_compute_engine import config_manager
from google_compute_engine import constants
from google_compute_engine import file_utils
from google_compute_engine import logger
from google_compute_engine import metadata_watcher
from google_compute_engine import network_utils
from google_compute_engine.networking.ip_forwarding import ip_forwarding
from google_compute_engine.networking.network_setup import network_setup
LOCKFILE = constants.LOCALSTATEDIR + '/lock/google_networking.lock'
class NetworkDaemon(object):
"""Manage networking based on changes to network metadata."""
network_interface_metadata_key = 'instance/network-interfaces'
def __init__(
self, ip_forwarding_enabled, proto_id, ip_aliases, target_instance_ips,
dhclient_script, dhcp_command, network_setup_enabled, debug=False):
"""Constructor.
Args:
ip_forwarding_enabled: bool, True if ip forwarding is enabled.
proto_id: string, the routing protocol identifier for Google IP changes.
ip_aliases: bool, True if the guest should configure IP alias routes.
target_instance_ips: bool, True supports internal IP load balancing.
dhclient_script: string, the path to a dhclient script used by dhclient.
dhcp_command: string, a command to enable Ethernet interfaces.
network_setup_enabled: bool, True if network setup is enabled.
debug: bool, True if debug output should write to the console.
"""
facility = logging.handlers.SysLogHandler.LOG_DAEMON
self.logger = logger.Logger(
name='google-networking', debug=debug, facility=facility)
self.ip_aliases = ip_aliases
self.ip_forwarding_enabled = ip_forwarding_enabled
self.network_setup_enabled = network_setup_enabled
self.target_instance_ips = target_instance_ips
self.ip_forwarding = ip_forwarding.IpForwarding(
proto_id=proto_id, debug=debug)
self.network_setup = network_setup.NetworkSetup(
dhclient_script=dhclient_script, dhcp_command=dhcp_command, debug=debug)
self.network_utils = network_utils.NetworkUtils(logger=self.logger)
self.watcher = metadata_watcher.MetadataWatcher(logger=self.logger)
try:
with file_utils.LockFile(LOCKFILE):
self.logger.info('Starting Google Networking daemon.')
timeout = 60 + random.randint(0, 30)
self.watcher.WatchMetadata(
self.HandleNetworkInterfaces,
metadata_key=self.network_interface_metadata_key, recursive=True,
timeout=timeout)
except (IOError, OSError) as e:
self.logger.warning(str(e))
def HandleNetworkInterfaces(self, result):
"""Called when network interface metadata changes.
Args:
result: dict, the metadata response with the network interfaces.
"""
network_interfaces = self._ExtractInterfaceMetadata(result)
if self.network_setup_enabled:
default_interface = network_interfaces[0]
if default_interface.ipv6:
self.network_setup.EnableIpv6([default_interface.name])
else:
self.network_setup.DisableIpv6([default_interface.name])
self.network_setup.EnableNetworkInterfaces(
[interface.name for interface in network_interfaces[1:]])
if self.ip_forwarding_enabled:
for interface in network_interfaces:
self.ip_forwarding.HandleForwardedIps(
interface.name, interface.forwarded_ips, interface.ip)
def _ExtractInterfaceMetadata(self, metadata):
"""Extracts network interface metadata.
Args:
metadata: dict, the metadata response with the new network interfaces.
Returns:
list, a list of NetworkInterface objects.
"""
interfaces = []
for network_interface in metadata:
mac_address = network_interface.get('mac')
interface = self.network_utils.GetNetworkInterface(mac_address)
ip_addresses = []
if interface:
ip_addresses.extend(network_interface.get('forwardedIps', []))
if self.ip_aliases:
ip_addresses.extend(network_interface.get('ipAliases', []))
if self.target_instance_ips:
ip_addresses.extend(network_interface.get('targetInstanceIps', []))
interfaces.append(NetworkDaemon.NetworkInterface(
interface, forwarded_ips=ip_addresses,
ip=network_interface.get('ip', None),
ipv6='dhcpv6Refresh' in network_interface.keys()))
else:
message = 'Network interface not found for MAC address: %s.'
self.logger.warning(message, mac_address)
return interfaces
class NetworkInterface(object):
"""Network interface information extracted from metadata."""
def __init__(self, name, forwarded_ips=None, ip=None, ipv6=False):
self.name = name
self.forwarded_ips = forwarded_ips
self.ip = ip
self.ipv6 = ipv6
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()
debug = bool(options.debug)
instance_config = config_manager.ConfigManager()
ip_forwarding_daemon_enabled = instance_config.GetOptionBool(
'Daemons', 'ip_forwarding_daemon')
ip_forwarding_enabled = instance_config.GetOptionBool(
'NetworkInterfaces', 'ip_forwarding') or ip_forwarding_daemon_enabled
network_setup_enabled = instance_config.GetOptionBool(
'NetworkInterfaces', 'setup')
network_daemon_enabled = instance_config.GetOptionBool(
'Daemons', 'network_daemon')
proto_id = instance_config.GetOptionString(
'IpForwarding', 'ethernet_proto_id')
ip_aliases = instance_config.GetOptionBool(
'IpForwarding', 'ip_aliases')
target_instance_ips = instance_config.GetOptionBool(
'IpForwarding', 'target_instance_ips')
dhclient_script = instance_config.GetOptionString(
'NetworkInterfaces', 'dhclient_script')
dhcp_command = instance_config.GetOptionString(
'NetworkInterfaces', 'dhcp_command')
if network_daemon_enabled:
NetworkDaemon(
ip_forwarding_enabled=ip_forwarding_enabled,
proto_id=proto_id,
ip_aliases=ip_aliases,
target_instance_ips=target_instance_ips,
dhclient_script=dhclient_script,
dhcp_command=dhcp_command,
network_setup_enabled=network_setup_enabled,
debug=debug)
if __name__ == '__main__':
main()
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