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#!/usr/bin/python3
#
# Copyright (C) 2018 Canonical, Ltd.
# Author: Mathieu Trudel-Lapierre <mathieu.trudel-lapierre@canonical.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 3.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
'''netplan ip command line'''
import logging
import os
import sys
import subprocess
from subprocess import CalledProcessError
from .. import utils
lease_path = {
'networkd': {
'pattern': 'run/systemd/netif/leases/{lease_id}',
'method': 'ifindex',
},
'NetworkManager': {
'pattern': 'var/lib/NetworkManager/internal-{lease_id}-{interface}.lease',
'method': 'nm_connection',
},
}
class NetplanIp(utils.NetplanCommand):
def __init__(self):
super().__init__(command_id='ip',
description='Retrieve IP information from the system',
leaf=False)
def run(self):
self.command_leases = NetplanIpLeases()
# subcommand: leases
p_ip_leases = self.subparsers.add_parser('leases',
help='Display IP leases',
add_help=False)
p_ip_leases.set_defaults(func=self.command_leases.run, commandclass=self.command_leases)
self.parse_args()
self.run_command()
class NetplanIpLeases(utils.NetplanCommand):
def __init__(self):
super().__init__(command_id='ip leases',
description='Display IP leases',
leaf=True)
def run(self):
self.parser.add_argument('interface',
help='Interface for which to display IP lease settings.')
self.parser.add_argument('--root-dir',
help='Search for configuration files in this root directory instead of /')
self.func = self.command_ip_leases
self.parse_args()
self.run_command()
def command_ip_leases(self):
if self.interface == 'help': # pragma: nocover (covered in autopkgtest)
self.print_usage()
def find_lease_file(mapping):
def lease_method_ifindex():
ifindex_f = os.path.join('/sys/class/net', self.interface, 'ifindex')
try:
with open(ifindex_f) as f:
return f.readlines()[0].strip()
except Exception as e:
logging.debug('Cannot read file %s: %s', ifindex_f, str(e))
raise
def lease_method_nm_connection():
# FIXME: handle older versions of NM where 'nmcli dev show' doesn't exist
try:
nmcli_dev_out = utils.nmcli_out(['dev', 'show', self.interface])
for line in nmcli_dev_out.splitlines():
if 'GENERAL.CONNECTION' in line:
conn_id = line.split(':')[1].rstrip().strip()
nmcli_con_out = utils.nmcli_out(['con', 'show', 'id', conn_id])
for line in nmcli_con_out.splitlines():
if 'connection.uuid' in line:
return line.split(':')[1].rstrip().strip()
except Exception as e:
raise Exception('Could not find a NetworkManager connection for the interface: %s' % str(e))
raise Exception('Could not find a NetworkManager connection for the interface')
lease_pattern = lease_path[mapping['backend']]['pattern']
lease_method = lease_path[mapping['backend']]['method']
try:
lease_id = eval("lease_method_" + lease_method)()
# We found something to build the path to the lease file with,
# at this point we may have something to look at; but if not,
# we'll rely on open() throwing an error.
# This might happen if networkd doesn't use DHCP for the interface,
# for instance.
path = os.path.join('/',
os.path.abspath(self.root_dir) if self.root_dir else "",
lease_pattern.format(interface=self.interface,
lease_id=lease_id))
# Fallback to 'dhclient' if no lease of NetworkManager's
# internal DHCP client is found
if not os.path.isfile(path):
path = path.replace('NetworkManager/internal-', 'NetworkManager/dhclient-')
with open(path) as f:
for line in f.readlines():
print(line.rstrip())
except Exception as e:
print("No lease found for interface '%s': %s" % (self.interface, str(e)),
file=sys.stderr)
sys.exit(1)
# XXX: This code path is only still supported for legacy reasons and
# not supposed to be called in the scope of a systemd generator. The
# 'netplan status' command should be used instead. Should it be moved to
# the 'configure' binary to keep legacy functionality around?
# See also the comment in main() in src/generate.c.
argv = [utils.get_generator_path()]
if self.root_dir:
argv += ['--root-dir', self.root_dir]
argv += ['--mapping', self.interface]
# Extract out of the generator our mapping in a dict.
logging.debug('command ip leases: running %s', argv)
try:
out = subprocess.check_output(argv, text=True)
except CalledProcessError: # pragma: nocover (better be covered in autopkgtest)
print("No lease found for interface '%s' (not managed by Netplan)" % self.interface, file=sys.stderr)
sys.exit(1)
mapping = {}
mapping_s = out.split(',')
for keyvalue in mapping_s:
key, value = keyvalue.strip().split('=')
mapping[key] = value
find_lease_file(mapping)
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