/usr/lib/python2.7/dist-packages/provisioningserver/network.py is in python-maas-provisioningserver 1.5.4+bzr2294-0ubuntu1.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 | # Copyright 2012 Canonical Ltd. This software is licensed under the
# GNU Affero General Public License version 3 (see the file LICENSE).
"""Discover networks attached to this cluster controller.
A cluster controller uses this when registering itself with the region
controller.
"""
from __future__ import (
absolute_import,
print_function,
unicode_literals,
)
str = None
__metaclass__ = type
__all__ = [
'discover_networks',
]
from itertools import chain
from netifaces import (
AF_INET,
ifaddresses,
interfaces,
)
class InterfaceInfo:
"""The details of a network interface we are interested in."""
def __init__(self, interface, ip=None, subnet_mask=None):
self.interface = interface
self.ip = ip
self.subnet_mask = subnet_mask
def may_be_subnet(self):
"""Could this be a subnet that MAAS is interested in?"""
return all([
self.interface != 'lo',
self.ip is not None,
self.subnet_mask is not None,
])
def as_dict(self):
"""Return information as a dictionary.
The return value's format is suitable as an interface description
for use with the `register` API call.
"""
return {
'interface': self.interface,
'ip': self.ip,
'subnet_mask': self.subnet_mask,
}
def get_interface_info(interface):
"""Return a list of `InterfaceInfo` for the named `interface`."""
addresses = ifaddresses(interface).get(AF_INET)
if addresses is None:
return []
else:
return [
InterfaceInfo(
interface, ip=address.get('addr'),
subnet_mask=address.get('netmask'))
for address in addresses]
def discover_networks():
"""Find the networks attached to this system."""
infos = chain.from_iterable(
get_interface_info(interface) for interface in interfaces())
return [
info.as_dict()
for info in infos
if info.may_be_subnet()
]
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