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# Copyright (C) 2013-2014 Canonical Ltd.
#
# Author: Scott Moser <[email protected]>
# Author: Blake Rouse <[email protected]>
#
# This file is part of cloud-init. See LICENSE file for license information.
import abc
import base64
import glob
import gzip
import io
import logging
import os
import shlex
from cloudinit import util
from cloudinit.net import get_devicelist, read_sys_net_safe
_OPEN_ISCSI_INTERFACE_FILE = "/run/initramfs/open-iscsi.interface"
KERNEL_CMDLINE_NETWORK_CONFIG_DISABLED = "disabled"
LOG = logging.getLogger(__name__)
class InitramfsNetworkConfigSource(metaclass=abc.ABCMeta):
"""ABC for net config sources that read config written by initramfses"""
@abc.abstractmethod
def is_applicable(self) -> bool:
"""Is this initramfs config source applicable to the current system?"""
@abc.abstractmethod
def render_config(self) -> dict:
"""Render a v1 network config from the initramfs configuration"""
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) -> 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:
for item in shlex.split(self._cmdline):
if item.startswith(("ip=", "ip6=")):
return True
if os.path.exists(_OPEN_ISCSI_INTERFACE_FILE):
# iBft can configure networking without ip=
return True
return False
def render_config(self) -> 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 'none' (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.
Full syntax is documented at:
https://git.kernel.org/pub/scm/libs/klibc/klibc.git/plain/usr/kinit/ipconfig/README.ipconfig
"""
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 as e:
raise ValueError("no 'DEVICE' or 'DEVICE6' entry in data") from e
# 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 = "none"
if proto not in ("none", "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)
# ipconfig's 'none' is called 'static'
if cur_proto == "none":
cur_proto = "static"
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_text_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):
# decompress blob or return original blob
with io.BytesIO(blob) as iobuf:
gzfp = None
try:
gzfp = gzip.GzipFile(mode="rb", fileobj=iobuf)
return gzfp.read()
except IOError:
return blob
finally:
if gzfp:
gzfp.close()
def _b64dgz(data):
"""Decode a string base64 encoding, if gzipped, uncompress as well
:return: decompressed unencoded string of the data or empty string on
unencoded data.
"""
try:
blob = base64.b64decode(data)
except (TypeError, ValueError):
LOG.error(
"Expected base64 encoded kernel commandline parameter"
" network-config. Ignoring network-config=%s.",
data,
)
return ""
return _decomp_gzip(blob)
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:
if data64 == KERNEL_CMDLINE_NETWORK_CONFIG_DISABLED:
return {"config": "disabled"}
return util.load_yaml(_b64dgz(data64))
return None
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