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# Copyright (C) 2013-2014 Canonical Ltd.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Blake Rouse <blake.rouse@canonical.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
import abc
import base64
import glob
import gzip
import io
import os
import six
from cloudinit import util
from . import get_devicelist
from . import read_sys_net_safe
_OPEN_ISCSI_INTERFACE_FILE = "/run/initramfs/open-iscsi.interface"
@six.add_metaclass(abc.ABCMeta)
class InitramfsNetworkConfigSource(object):
"""ABC for net config sources that read config written by initramfses"""
@abc.abstractmethod
def is_applicable(self):
# type: () -> bool
"""Is this initramfs config source applicable to the current system?"""
pass
@abc.abstractmethod
def render_config(self):
# type: () -> dict
"""Render a v1 network config from the initramfs configuration"""
pass
class KlibcNetworkConfigSource(InitramfsNetworkConfigSource):
"""InitramfsNetworkConfigSource for klibc initramfs (i.e. Debian/Ubuntu)
Has three parameters, but they are intended to make testing simpler, _not_
for use in production code. (This is indicated by the prepended
underscores.)
"""
def __init__(self, _files=None, _mac_addrs=None, _cmdline=None):
self._files = _files
self._mac_addrs = _mac_addrs
self._cmdline = _cmdline
# Set defaults here, as they require computation that we don't want to
# do at method definition time
if self._files is None:
self._files = _get_klibc_net_cfg_files()
if self._cmdline is None:
self._cmdline = util.get_cmdline()
if self._mac_addrs is None:
self._mac_addrs = {}
for k in get_devicelist():
mac_addr = read_sys_net_safe(k, 'address')
if mac_addr:
self._mac_addrs[k] = mac_addr
def is_applicable(self):
# type: () -> bool
"""
Return whether this system has klibc initramfs network config or not
Will return True if:
(a) klibc files exist in /run, AND
(b) either:
(i) ip= or ip6= are on the kernel cmdline, OR
(ii) an open-iscsi interface file is present in the system
"""
if self._files:
if 'ip=' in self._cmdline or 'ip6=' in self._cmdline:
return True
if os.path.exists(_OPEN_ISCSI_INTERFACE_FILE):
# iBft can configure networking without ip=
return True
return False
def render_config(self):
# type: () -> dict
return config_from_klibc_net_cfg(
files=self._files, mac_addrs=self._mac_addrs,
)
_INITRAMFS_CONFIG_SOURCES = [KlibcNetworkConfigSource]
def _klibc_to_config_entry(content, mac_addrs=None):
"""Convert a klibc written shell content file to a 'config' entry
When ip= is seen on the kernel command line in debian initramfs
and networking is brought up, ipconfig will populate
/run/net-<name>.cfg.
The files are shell style syntax, and examples are in the tests
provided here. There is no good documentation on this unfortunately.
DEVICE=<name> is expected/required and PROTO should indicate if
this is 'static' or 'dhcp' or 'dhcp6' (LP: #1621507).
note that IPV6PROTO is also written by newer code to address the
possibility of both ipv4 and ipv6 getting addresses.
"""
if mac_addrs is None:
mac_addrs = {}
data = util.load_shell_content(content)
try:
name = data['DEVICE'] if 'DEVICE' in data else data['DEVICE6']
except KeyError:
raise ValueError("no 'DEVICE' or 'DEVICE6' entry in data")
# ipconfig on precise does not write PROTO
# IPv6 config gives us IPV6PROTO, not PROTO.
proto = data.get('PROTO', data.get('IPV6PROTO'))
if not proto:
if data.get('filename'):
proto = 'dhcp'
else:
proto = 'static'
if proto not in ('static', 'dhcp', 'dhcp6'):
raise ValueError("Unexpected value for PROTO: %s" % proto)
iface = {
'type': 'physical',
'name': name,
'subnets': [],
}
if name in mac_addrs:
iface['mac_address'] = mac_addrs[name]
# Handle both IPv4 and IPv6 values
for pre in ('IPV4', 'IPV6'):
# if no IPV4ADDR or IPV6ADDR, then go on.
if pre + "ADDR" not in data:
continue
# PROTO for ipv4, IPV6PROTO for ipv6
cur_proto = data.get(pre + 'PROTO', proto)
subnet = {'type': cur_proto, 'control': 'manual'}
# only populate address for static types. While the rendered config
# may have an address for dhcp, that is not really expected.
if cur_proto == 'static':
subnet['address'] = data[pre + 'ADDR']
# these fields go right on the subnet
for key in ('NETMASK', 'BROADCAST', 'GATEWAY'):
if pre + key in data:
subnet[key.lower()] = data[pre + key]
dns = []
# handle IPV4DNS0 or IPV6DNS0
for nskey in ('DNS0', 'DNS1'):
ns = data.get(pre + nskey)
# verify it has something other than 0.0.0.0 (or ipv6)
if ns and len(ns.strip(":.0")):
dns.append(data[pre + nskey])
if dns:
subnet['dns_nameservers'] = dns
# add search to both ipv4 and ipv6, as it has no namespace
search = data.get('DOMAINSEARCH')
if search:
if ',' in search:
subnet['dns_search'] = search.split(",")
else:
subnet['dns_search'] = search.split()
iface['subnets'].append(subnet)
return name, iface
def _get_klibc_net_cfg_files():
return glob.glob('/run/net-*.conf') + glob.glob('/run/net6-*.conf')
def config_from_klibc_net_cfg(files=None, mac_addrs=None):
if files is None:
files = _get_klibc_net_cfg_files()
entries = []
names = {}
for cfg_file in files:
name, entry = _klibc_to_config_entry(util.load_file(cfg_file),
mac_addrs=mac_addrs)
if name in names:
prev = names[name]['entry']
if prev.get('mac_address') != entry.get('mac_address'):
raise ValueError(
"device '{name}' was defined multiple times ({files})"
" but had differing mac addresses: {old} -> {new}.".format(
name=name, files=' '.join(names[name]['files']),
old=prev.get('mac_address'),
new=entry.get('mac_address')))
prev['subnets'].extend(entry['subnets'])
names[name]['files'].append(cfg_file)
else:
names[name] = {'files': [cfg_file], 'entry': entry}
entries.append(entry)
return {'config': entries, 'version': 1}
def read_initramfs_config():
"""
Return v1 network config for initramfs-configured networking (or None)
This will consider each _INITRAMFS_CONFIG_SOURCES entry in turn, and return
v1 network configuration for the first one that is applicable. If none are
applicable, return None.
"""
for src_cls in _INITRAMFS_CONFIG_SOURCES:
cfg_source = src_cls()
if not cfg_source.is_applicable():
continue
return cfg_source.render_config()
return None
def _decomp_gzip(blob, strict=True):
# decompress blob. raise exception if not compressed unless strict=False.
with io.BytesIO(blob) as iobuf:
gzfp = None
try:
gzfp = gzip.GzipFile(mode="rb", fileobj=iobuf)
return gzfp.read()
except IOError:
if strict:
raise
return blob
finally:
if gzfp:
gzfp.close()
def _b64dgz(b64str, gzipped="try"):
# decode a base64 string. If gzipped is true, transparently uncompresss
# if gzipped is 'try', then try gunzip, returning the original on fail.
try:
blob = base64.b64decode(b64str)
except TypeError:
raise ValueError("Invalid base64 text: %s" % b64str)
if not gzipped:
return blob
return _decomp_gzip(blob, strict=gzipped != "try")
def read_kernel_cmdline_config(cmdline=None):
if cmdline is None:
cmdline = util.get_cmdline()
if 'network-config=' in cmdline:
data64 = None
for tok in cmdline.split():
if tok.startswith("network-config="):
data64 = tok.split("=", 1)[1]
if data64:
return util.load_yaml(_b64dgz(data64))
return None
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