/usr/lib/python3/dist-packages/provisioningserver/utils/iproute.py is in python3-maas-provisioningserver 2.4.0~beta2-6865-gec43e47e6-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# GNU Affero General Public License version 3 (see the file LICENSE).
"""Utility to parse 'ip route list scope global'.
Example dictionary returned by parse_ip_route():
{u'default': {u'via': u'192.168.1.1',
u'dev': 'eno1',
u'proto': 'static',
u'metric': 100},
u'172.16.254.0/24': {u'via': u'192.168.1.1',
u'dev': 'eno1'}}
The dictionary above is generated given the following input:
default via 192.168.1.1 dev eno1 proto static metric 100
172.16.254.0/24 via 192.168.1.1 dev eno1
"""
__all__ = [
'get_ip_route',
]
from provisioningserver.utils.ipaddr import get_settings_dict
from provisioningserver.utils.shell import call_and_check
def _parse_route_definition(line):
"""Given a string of the format:
<subnet> via <ip_address> dev <interface> metric <metric>
Returns a dictionary containing the component parts.
:param line: unicode
:return: dict
:raises: ValueError if a malformed interface route line is presented.
"""
subnet, line = line.split(" ", 1)
settings = get_settings_dict(line.strip())
if 'metric' in settings:
settings['metric'] = int(settings['metric'])
return subnet.strip(), settings
def parse_ip_route(output):
"""Parses the output from 'ip route list scope global' into a dictionary.
Given the full output from 'ip route list scope global', parses it and
returns a dictionary mapping each subnet to a route.
:param output: string or unicode
:return: dict
"""
# It's possible, though unlikely, that unicode characters will appear
# in interface names.
if not isinstance(output, str):
output = str(output, "utf-8")
routes = {}
for line in output.splitlines():
subnet, route = _parse_route_definition(line)
routes[subnet] = route
return routes
def get_ip_route():
"""Returns this system's local IP route information as a dictionary.
:raises:ExternalProcessError: if IP route information could not be
gathered.
"""
ip_route_output = call_and_check(
["ip", "route", "list", "scope", "global"])
return parse_ip_route(ip_route_output)
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