OpenStack Networking (Neutron)
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#!/usr/bin/env python
# Copyright (c) 2012 Openstack Foundation
# 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.
"""Neutron root wrapper for dom0.
Executes networking commands in dom0. The XenAPI plugin is
responsible determining whether a command is safe to execute.
"""
from __future__ import print_function
import ConfigParser
import json
import os
import select
import sys
import traceback
import XenAPI
RC_UNAUTHORIZED = 99
RC_NOCOMMAND = 98
RC_BADCONFIG = 97
RC_XENAPI_ERROR = 96
def parse_args():
# Split arguments, require at least a command
exec_name = sys.argv.pop(0)
# argv[0] required; path to conf file
if len(sys.argv) < 2:
print("%s: No command specified" % exec_name)
sys.exit(RC_NOCOMMAND)
config_file = sys.argv.pop(0)
user_args = sys.argv[:]
return exec_name, config_file, user_args
def _xenapi_section_name(config):
sections = [sect for sect in config.sections() if sect.lower() == "xenapi"]
if len(sections) == 1:
return sections[0]
print("Multiple [xenapi] sections or no [xenapi] section found!")
sys.exit(RC_BADCONFIG)
def load_configuration(exec_name, config_file):
config = ConfigParser.RawConfigParser()
config.read(config_file)
try:
exec_dirs = config.get("DEFAULT", "exec_dirs").split(",")
filters_path = config.get("DEFAULT", "filters_path").split(",")
section = _xenapi_section_name(config)
url = config.get(section, "xenapi_connection_url")
username = config.get(section, "xenapi_connection_username")
password = config.get(section, "xenapi_connection_password")
except ConfigParser.Error:
print("%s: Incorrect configuration file: %s" % (exec_name, config_file))
sys.exit(RC_BADCONFIG)
if not url or not password:
msg = ("%s: Must specify xenapi_connection_url, "
"xenapi_connection_username (optionally), and "
"xenapi_connection_password in %s") % (exec_name, config_file)
print(msg)
sys.exit(RC_BADCONFIG)
return dict(
filters_path=filters_path,
url=url,
username=username,
password=password,
exec_dirs=exec_dirs,
)
def filter_command(exec_name, filters_path, user_args, exec_dirs):
# Add ../ to sys.path to allow running from branch
possible_topdir = os.path.normpath(os.path.join(os.path.abspath(exec_name),
os.pardir, os.pardir))
if os.path.exists(os.path.join(possible_topdir, "neutron", "__init__.py")):
sys.path.insert(0, possible_topdir)
from oslo.rootwrap import wrapper
# Execute command if it matches any of the loaded filters
filters = wrapper.load_filters(filters_path)
filter_match = wrapper.match_filter(
filters, user_args, exec_dirs=exec_dirs)
if not filter_match:
print("Unauthorized command: %s" % ' '.join(user_args))
sys.exit(RC_UNAUTHORIZED)
def run_command(url, username, password, user_args, cmd_input):
try:
session = XenAPI.Session(url)
session.login_with_password(username, password)
host = session.xenapi.session.get_this_host(session.handle)
result = session.xenapi.host.call_plugin(
host, 'netwrap', 'run_command',
{'cmd': json.dumps(user_args), 'cmd_input': json.dumps(cmd_input)})
return json.loads(result)
except Exception as e:
traceback.print_exc()
sys.exit(RC_XENAPI_ERROR)
def main():
exec_name, config_file, user_args = parse_args()
config = load_configuration(exec_name, config_file)
filter_command(exec_name, config['filters_path'], user_args, config['exec_dirs'])
# If data is available on the standard input, we need to pass it to the
# command executed in dom0
cmd_input = None
if select.select([sys.stdin,],[],[],0.0)[0]:
cmd_input = "".join(sys.stdin)
return run_command(config['url'], config['username'], config['password'],
user_args, cmd_input)
if __name__ == '__main__':
print(main())