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# Copyright (C) 2013-2014 Canonical Ltd.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Blake Rouse <blake.rouse@canonical.com>
#
# Curtin is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the
# Free Software Foundation, either version 3 of the License, or (at your
# option) any later version.
#
# Curtin 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 Affero General Public License for
# more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with Curtin. If not, see <http://www.gnu.org/licenses/>.
import base64
import glob
import gzip
import io
import shlex
from cloudinit.net import get_devicelist
from cloudinit.net import sys_netdev_info
from cloudinit import util
def _load_shell_content(content, add_empty=False, empty_val=None):
"""Given shell like syntax (key=value\nkey2=value2\n) in content
return the data in dictionary form. If 'add_empty' is True
then add entries in to the returned dictionary for 'VAR='
variables. Set their value to empty_val."""
data = {}
for line in shlex.split(content):
key, value = line.split("=", 1)
if not value:
value = empty_val
if add_empty or value:
data[key] = value
return data
def _klibc_to_config_entry(content, mac_addrs=None):
"""Convert a klibc writtent 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'.
"""
if mac_addrs is None:
mac_addrs = {}
data = _load_shell_content(content)
try:
name = data['DEVICE']
except KeyError:
raise ValueError("no 'DEVICE' entry in data")
# ipconfig on precise does not write PROTO
proto = data.get('PROTO')
if not proto:
if data.get('filename'):
proto = 'dhcp'
else:
proto = 'static'
if proto not in ('static', 'dhcp'):
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]
# originally believed there might be IPV6* values
for v, pre in (('ipv4', 'IPV4'),):
# if no IPV4ADDR or IPV6ADDR, then go on.
if pre + "ADDR" not in data:
continue
subnet = {'type': proto, 'control': 'manual'}
# 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 config_from_klibc_net_cfg(files=None, mac_addrs=None):
if files is None:
files = glob.glob('/run/net*.conf')
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:
raise ValueError(
"device '%s' defined multiple times: %s and %s" % (
name, names[name], cfg_file))
names[name] = cfg_file
entries.append(entry)
return {'config': entries, 'version': 1}
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(files=None, mac_addrs=None, 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))
if 'ip=' not in cmdline:
return None
if mac_addrs is None:
mac_addrs = {k: sys_netdev_info(k, 'address')
for k in get_devicelist()}
return config_from_klibc_net_cfg(files=files, mac_addrs=mac_addrs)
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