Current File : //usr/lib/python3/dist-packages/cloudinit/distros/net_util.py
# Copyright (C) 2012 Canonical Ltd.
# Copyright (C) 2012, 2013 Hewlett-Packard Development Company, L.P.
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
# This is a util function to translate debian based distro interface blobs as
# given in /etc/network/interfaces to an *somewhat* agnostic format for
# distributions that use other formats.
#
# TODO(harlowja) remove when we have python-netcf active...
#
# The format is the following:
# {
# <device-name>: {
# # All optional (if not existent in original format)
# "netmask": <ip>,
# "broadcast": <ip>,
# "gateway": <ip>,
# "address": <ip>,
# "bootproto": "static"|"dhcp",
# "dns-search": <hostname>,
# "hwaddress": <mac-address>,
# "auto": True (or non-existent),
# "dns-nameservers": [<ip/hostname>, ...],
# }
# }
#
# Things to note, comments are removed, if a ubuntu/debian interface is
# marked as auto then only then first segment (?) is retained, ie
# 'auto eth0 eth0:1' just marks eth0 as auto (not eth0:1).
#
# Example input:
#
# auto lo
# iface lo inet loopback
#
# auto eth0
# iface eth0 inet static
# address 10.0.0.1
# netmask 255.255.252.0
# broadcast 10.0.0.255
# gateway 10.0.0.2
# dns-nameservers 98.0.0.1 98.0.0.2
#
# Example output:
# {
# "lo": {
# "auto": true
# },
# "eth0": {
# "auto": true,
# "dns-nameservers": [
# "98.0.0.1",
# "98.0.0.2"
# ],
# "broadcast": "10.0.0.255",
# "netmask": "255.255.252.0",
# "bootproto": "static",
# "address": "10.0.0.1",
# "gateway": "10.0.0.2"
# }
# }
from cloudinit.net import mask_and_ipv4_to_bcast_addr, net_prefix_to_ipv4_mask
def translate_network(settings):
# Get the standard cmd, args from the ubuntu format
entries = []
for line in settings.splitlines():
line = line.strip()
if not line or line.startswith("#"):
continue
split_up = line.split(None, 1)
if len(split_up) <= 1:
continue
entries.append(split_up)
# Figure out where each iface section is
ifaces = []
consume = {}
for (cmd, args) in entries:
if cmd == "iface":
if consume:
ifaces.append(consume)
consume = {}
consume[cmd] = args
else:
consume[cmd] = args
# Check if anything left over to consume
absorb = False
for (cmd, args) in consume.items():
if cmd == "iface":
absorb = True
if absorb:
ifaces.append(consume)
# Now translate
real_ifaces = {}
for info in ifaces:
if "iface" not in info:
continue
iface_details = info["iface"].split(None)
# Check if current device *may* have an ipv6 IP
use_ipv6 = False
if "inet6" in iface_details:
use_ipv6 = True
dev_name = None
if len(iface_details) >= 1:
dev = iface_details[0].strip().lower()
if dev:
dev_name = dev
if not dev_name:
continue
iface_info = {}
iface_info["ipv6"] = {}
if len(iface_details) >= 3:
proto_type = iface_details[2].strip().lower()
# Seems like this can be 'loopback' which we don't
# really care about
if proto_type in ["dhcp", "static"]:
iface_info["bootproto"] = proto_type
# These can just be copied over
if use_ipv6:
for k in ["address", "gateway"]:
if k in info:
val = info[k].strip().lower()
if val:
iface_info["ipv6"][k] = val
else:
for k in ["netmask", "address", "gateway", "broadcast"]:
if k in info:
val = info[k].strip().lower()
if val:
iface_info[k] = val
# handle static ip configurations using
# ipaddress/prefix-length format
if "address" in iface_info:
if "netmask" not in iface_info:
# check if the address has a network prefix
addr, _, prefix = iface_info["address"].partition("/")
if prefix:
iface_info["netmask"] = net_prefix_to_ipv4_mask(prefix)
iface_info["address"] = addr
# if we set the netmask, we also can set the broadcast
iface_info["broadcast"] = mask_and_ipv4_to_bcast_addr(
iface_info["netmask"], addr
)
# Name server info provided??
if "dns-nameservers" in info:
iface_info["dns-nameservers"] = info["dns-nameservers"].split()
# Name server search info provided??
if "dns-search" in info:
iface_info["dns-search"] = info["dns-search"].split()
# Is any mac address spoofing going on??
if "hwaddress" in info:
hw_info = info["hwaddress"].lower().strip()
hw_split = hw_info.split(None, 1)
if len(hw_split) == 2 and hw_split[0].startswith("ether"):
hw_addr = hw_split[1]
if hw_addr:
iface_info["hwaddress"] = hw_addr
# If ipv6 is enabled, device will have multiple IPs, so we need to
# update the dictionary instead of overwriting it...
if dev_name in real_ifaces:
real_ifaces[dev_name].update(iface_info)
else:
real_ifaces[dev_name] = iface_info
# Check for those that should be started on boot via 'auto'
for (cmd, args) in entries:
args = args.split(None)
if not args:
continue
dev_name = args[0].strip().lower()
if cmd == "auto":
# Seems like auto can be like 'auto eth0 eth0:1' so just get the
# first part out as the device name
if dev_name in real_ifaces:
real_ifaces[dev_name]["auto"] = True
if cmd == "iface" and "inet6" in args:
real_ifaces[dev_name]["inet6"] = True
return real_ifaces
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