64 lines
2.1 KiB
Python
64 lines
2.1 KiB
Python
# Copyright (c) 2011 OpenStack, LLC.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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Set of utilities for the Guest Manager
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"""
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import fcntl
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import socket
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import struct
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from nova import context
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from nova import flags
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from reddwarf.db import db_api as dbapi
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# from nova.db import api as dbapi
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flags.DEFINE_string('guest_ethernet_device', "eth0",
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'Default Ethernet device for the guest agent')
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FLAGS = flags.FLAGS
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instance_id = None
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def get_instance_id():
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"""Return the instance id for this guest"""
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global instance_id
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if not instance_id:
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# TODO(rnirmal): Better way to get the instance id
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address = get_ipv4_address()
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instance = dbapi.instance_get_by_fixed_ip(context.get_admin_context(),
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address)
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instance_id = instance.id
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return instance_id
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def get_ipv4_address():
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""" Get the ip address provided an ethernet device"""
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# Create an IPV4 (AF_INET) datagram socket
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soc = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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# fcntl is a system fuction that takes in the socket file descriptor,
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# 0x8915 = SIOCGIFADDR which is an os call passed to ioctl which returns
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# the list of interface addresses.
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# struct.pack, packs the ethernet device string into a binary buffer
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return socket.inet_ntoa(fcntl.ioctl(soc.fileno(), 0x8915,
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struct.pack('256s',
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FLAGS.guest_ethernet_device[:15])
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)[20:24])
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