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Mini Shell
Mini Shell
# Copyright (C) 2017 Canonical Ltd.
#
# Author: Ryan Harper <ryan.harper@canonical.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
import copy
import functools
import logging
from typing import TYPE_CHECKING, Any, Dict, Optional
from cloudinit import safeyaml, util
from cloudinit.net import (
find_interface_name_from_mac,
get_interfaces_by_mac,
ipv4_mask_to_net_prefix,
ipv6_mask_to_net_prefix,
is_ip_network,
is_ipv4_network,
is_ipv6_address,
is_ipv6_network,
net_prefix_to_ipv4_mask,
)
if TYPE_CHECKING:
from cloudinit.net.renderer import Renderer
LOG = logging.getLogger(__name__)
NETWORK_STATE_VERSION = 1
NETWORK_STATE_REQUIRED_KEYS = {
1: ["version", "config", "network_state"],
}
NETWORK_V2_KEY_FILTER = [
"addresses",
"dhcp4",
"dhcp4-overrides",
"dhcp6",
"dhcp6-overrides",
"gateway4",
"gateway6",
"interfaces",
"match",
"mtu",
"nameservers",
"renderer",
"set-name",
"wakeonlan",
"accept-ra",
]
NET_CONFIG_TO_V2: Dict[str, Dict[str, Any]] = {
"bond": {
"bond-ad-select": "ad-select",
"bond-arp-interval": "arp-interval",
"bond-arp-ip-target": "arp-ip-target",
"bond-arp-validate": "arp-validate",
"bond-downdelay": "down-delay",
"bond-fail-over-mac": "fail-over-mac-policy",
"bond-lacp-rate": "lacp-rate",
"bond-miimon": "mii-monitor-interval",
"bond-min-links": "min-links",
"bond-mode": "mode",
"bond-num-grat-arp": "gratuitous-arp",
"bond-primary": "primary",
"bond-primary-reselect": "primary-reselect-policy",
"bond-updelay": "up-delay",
"bond-xmit-hash-policy": "transmit-hash-policy",
},
"bridge": {
"bridge_ageing": "ageing-time",
"bridge_bridgeprio": "priority",
"bridge_fd": "forward-delay",
"bridge_gcint": None,
"bridge_hello": "hello-time",
"bridge_maxage": "max-age",
"bridge_maxwait": None,
"bridge_pathcost": "path-cost",
"bridge_portprio": "port-priority",
"bridge_stp": "stp",
"bridge_waitport": None,
},
}
def warn_deprecated_all_devices(dikt: dict) -> None:
"""Warn about deprecations of v2 properties for all devices"""
if "gateway4" in dikt or "gateway6" in dikt:
LOG.warning(
"DEPRECATED: The use of `gateway4` and `gateway6` is"
" deprecated. For more info check out: "
"https://cloudinit.readthedocs.io/en/latest/topics/network-config-format-v2.html" # noqa: E501
)
def from_state_file(state_file):
state = util.read_conf(state_file)
nsi = NetworkStateInterpreter()
nsi.load(state)
return nsi
def diff_keys(expected, actual):
missing = set(expected)
for key in actual:
missing.discard(key)
return missing
class InvalidCommand(Exception):
pass
def ensure_command_keys(required_keys):
def wrapper(func):
@functools.wraps(func)
def decorator(self, command, *args, **kwargs):
if required_keys:
missing_keys = diff_keys(required_keys, command)
if missing_keys:
raise InvalidCommand(
"Command missing %s of required keys %s"
% (missing_keys, required_keys)
)
return func(self, command, *args, **kwargs)
return decorator
return wrapper
class CommandHandlerMeta(type):
"""Metaclass that dynamically creates a 'command_handlers' attribute.
This will scan the to-be-created class for methods that start with
'handle_' and on finding those will populate a class attribute mapping
so that those methods can be quickly located and called.
"""
def __new__(cls, name, parents, dct):
command_handlers = {}
for attr_name, attr in dct.items():
if callable(attr) and attr_name.startswith("handle_"):
handles_what = attr_name[len("handle_") :]
if handles_what:
command_handlers[handles_what] = attr
dct["command_handlers"] = command_handlers
return super(CommandHandlerMeta, cls).__new__(cls, name, parents, dct)
class NetworkState:
def __init__(
self, network_state: dict, version: int = NETWORK_STATE_VERSION
):
self._network_state = copy.deepcopy(network_state)
self._version = version
self.use_ipv6 = network_state.get("use_ipv6", False)
self._has_default_route = None
@property
def config(self) -> dict:
return self._network_state["config"]
@property
def version(self):
return self._version
@property
def dns_nameservers(self):
try:
return self._network_state["dns"]["nameservers"]
except KeyError:
return []
@property
def dns_searchdomains(self):
try:
return self._network_state["dns"]["search"]
except KeyError:
return []
@property
def has_default_route(self):
if self._has_default_route is None:
self._has_default_route = self._maybe_has_default_route()
return self._has_default_route
def iter_interfaces(self, filter_func=None):
ifaces = self._network_state.get("interfaces", {})
for iface in ifaces.values():
if filter_func is None:
yield iface
else:
if filter_func(iface):
yield iface
def iter_routes(self, filter_func=None):
for route in self._network_state.get("routes", []):
if filter_func is not None:
if filter_func(route):
yield route
else:
yield route
def _maybe_has_default_route(self):
for route in self.iter_routes():
if self._is_default_route(route):
return True
for iface in self.iter_interfaces():
for subnet in iface.get("subnets", []):
for route in subnet.get("routes", []):
if self._is_default_route(route):
return True
return False
def _is_default_route(self, route):
default_nets = ("::", "0.0.0.0")
return (
route.get("prefix") == 0 and route.get("network") in default_nets
)
@classmethod
def to_passthrough(cls, network_state: dict) -> "NetworkState":
"""Instantiates a `NetworkState` without interpreting its data.
That means only `config` and `version` are copied.
:param network_state: Network state data.
:return: Instance of `NetworkState`.
"""
kwargs = {}
if "version" in network_state:
kwargs["version"] = network_state["version"]
return cls({"config": network_state}, **kwargs)
class NetworkStateInterpreter(metaclass=CommandHandlerMeta):
initial_network_state = {
"interfaces": {},
"routes": [],
"dns": {
"nameservers": [],
"search": [],
},
"use_ipv6": False,
"config": None,
}
def __init__(
self,
version=NETWORK_STATE_VERSION,
config=None,
renderer: "Optional[Renderer]" = None,
):
self._version = version
self._config = config
self._network_state = copy.deepcopy(self.initial_network_state)
self._network_state["config"] = config
self._parsed = False
self._interface_dns_map: dict = {}
self._renderer = renderer
@property
def network_state(self) -> NetworkState:
from cloudinit.net.netplan import Renderer as NetplanRenderer
if self._version == 2 and isinstance(self._renderer, NetplanRenderer):
LOG.debug("Passthrough netplan v2 config")
return NetworkState.to_passthrough(self._config)
return NetworkState(self._network_state, version=self._version)
@property
def use_ipv6(self):
return self._network_state.get("use_ipv6")
@use_ipv6.setter
def use_ipv6(self, val):
self._network_state.update({"use_ipv6": val})
def dump(self):
state = {
"version": self._version,
"config": self._config,
"network_state": self._network_state,
}
return safeyaml.dumps(state)
def load(self, state):
if "version" not in state:
LOG.error("Invalid state, missing version field")
raise ValueError("Invalid state, missing version field")
required_keys = NETWORK_STATE_REQUIRED_KEYS[state["version"]]
missing_keys = diff_keys(required_keys, state)
if missing_keys:
msg = "Invalid state, missing keys: %s" % (missing_keys)
LOG.error(msg)
raise ValueError(msg)
# v1 - direct attr mapping, except version
for key in [k for k in required_keys if k not in ["version"]]:
setattr(self, key, state[key])
def dump_network_state(self):
return safeyaml.dumps(self._network_state)
def as_dict(self):
return {"version": self._version, "config": self._config}
def parse_config(self, skip_broken=True):
if self._version == 1:
self.parse_config_v1(skip_broken=skip_broken)
self._parsed = True
elif self._version == 2:
self.parse_config_v2(skip_broken=skip_broken)
self._parsed = True
def parse_config_v1(self, skip_broken=True):
for command in self._config:
command_type = command["type"]
try:
handler = self.command_handlers[command_type]
except KeyError as e:
raise RuntimeError(
"No handler found for command '%s'" % command_type
) from e
try:
handler(self, command)
except InvalidCommand:
if not skip_broken:
raise
else:
LOG.warning(
"Skipping invalid command: %s", command, exc_info=True
)
LOG.debug(self.dump_network_state())
for interface, dns in self._interface_dns_map.items():
iface = None
try:
iface = self._network_state["interfaces"][interface]
except KeyError as e:
raise ValueError(
"Nameserver specified for interface {0}, "
"but interface {0} does not exist!".format(interface)
) from e
if iface:
nameservers, search = dns
iface["dns"] = {
"addresses": nameservers,
"search": search,
}
def parse_config_v2(self, skip_broken=True):
from cloudinit.net.netplan import Renderer as NetplanRenderer
if isinstance(self._renderer, NetplanRenderer):
# Nothing to parse as we are going to perform a Netplan passthrough
return
for command_type, command in self._config.items():
if command_type in ["version", "renderer"]:
continue
try:
handler = self.command_handlers[command_type]
except KeyError as e:
raise RuntimeError(
"No handler found for command '%s'" % command_type
) from e
try:
handler(self, command)
self._v2_common(command)
except InvalidCommand:
if not skip_broken:
raise
else:
LOG.warning(
"Skipping invalid command: %s", command, exc_info=True
)
LOG.debug(self.dump_network_state())
@ensure_command_keys(["name"])
def handle_loopback(self, command):
return self.handle_physical(command)
@ensure_command_keys(["name"])
def handle_physical(self, command):
"""
command = {
'type': 'physical',
'mac_address': 'c0:d6:9f:2c:e8:80',
'name': 'eth0',
'subnets': [
{'type': 'dhcp4'}
],
'accept-ra': 'true'
}
"""
interfaces = self._network_state.get("interfaces", {})
iface = interfaces.get(command["name"], {})
for param, val in command.get("params", {}).items():
iface.update({param: val})
# convert subnet ipv6 netmask to cidr as needed
subnets = _normalize_subnets(command.get("subnets"))
# automatically set 'use_ipv6' if any addresses are ipv6
if not self.use_ipv6:
for subnet in subnets:
if subnet.get("type").endswith("6") or is_ipv6_address(
subnet.get("address")
):
self.use_ipv6 = True
break
accept_ra = command.get("accept-ra", None)
if accept_ra is not None:
accept_ra = util.is_true(accept_ra)
wakeonlan = command.get("wakeonlan", None)
if wakeonlan is not None:
wakeonlan = util.is_true(wakeonlan)
iface.update(
{
"name": command.get("name"),
"type": command.get("type"),
"mac_address": command.get("mac_address"),
"inet": "inet",
"mode": "manual",
"mtu": command.get("mtu"),
"address": None,
"gateway": None,
"subnets": subnets,
"accept-ra": accept_ra,
"wakeonlan": wakeonlan,
}
)
self._network_state["interfaces"].update({command.get("name"): iface})
self.dump_network_state()
@ensure_command_keys(["name", "vlan_id", "vlan_link"])
def handle_vlan(self, command):
"""
auto eth0.222
iface eth0.222 inet static
address 10.10.10.1
netmask 255.255.255.0
hwaddress ether BC:76:4E:06:96:B3
vlan-raw-device eth0
"""
interfaces = self._network_state.get("interfaces", {})
self.handle_physical(command)
iface = interfaces.get(command.get("name"), {})
iface["vlan-raw-device"] = command.get("vlan_link")
iface["vlan_id"] = command.get("vlan_id")
interfaces.update({iface["name"]: iface})
@ensure_command_keys(["name", "bond_interfaces", "params"])
def handle_bond(self, command):
"""
#/etc/network/interfaces
auto eth0
iface eth0 inet manual
bond-master bond0
bond-mode 802.3ad
auto eth1
iface eth1 inet manual
bond-master bond0
bond-mode 802.3ad
auto bond0
iface bond0 inet static
address 192.168.0.10
gateway 192.168.0.1
netmask 255.255.255.0
bond-slaves none
bond-mode 802.3ad
bond-miimon 100
bond-downdelay 200
bond-updelay 200
bond-lacp-rate 4
"""
self.handle_physical(command)
interfaces = self._network_state.get("interfaces")
iface = interfaces.get(command.get("name"), {})
for param, val in command.get("params").items():
iface.update({param: val})
iface.update({"bond-slaves": "none"})
self._network_state["interfaces"].update({iface["name"]: iface})
# handle bond slaves
for ifname in command.get("bond_interfaces"):
if ifname not in interfaces:
cmd = {
"name": ifname,
"type": "bond",
}
# inject placeholder
self.handle_physical(cmd)
interfaces = self._network_state.get("interfaces", {})
bond_if = interfaces.get(ifname)
bond_if["bond-master"] = command.get("name")
# copy in bond config into slave
for param, val in command.get("params").items():
bond_if.update({param: val})
self._network_state["interfaces"].update({ifname: bond_if})
@ensure_command_keys(["name", "bridge_interfaces"])
def handle_bridge(self, command):
"""
auto br0
iface br0 inet static
address 10.10.10.1
netmask 255.255.255.0
bridge_ports eth0 eth1
bridge_stp off
bridge_fd 0
bridge_maxwait 0
bridge_params = [
"bridge_ports",
"bridge_ageing",
"bridge_bridgeprio",
"bridge_fd",
"bridge_gcint",
"bridge_hello",
"bridge_hw",
"bridge_maxage",
"bridge_maxwait",
"bridge_pathcost",
"bridge_portprio",
"bridge_stp",
"bridge_waitport",
]
"""
# find one of the bridge port ifaces to get mac_addr
# handle bridge_slaves
interfaces = self._network_state.get("interfaces", {})
for ifname in command.get("bridge_interfaces"):
if ifname in interfaces:
continue
cmd = {
"name": ifname,
}
# inject placeholder
self.handle_physical(cmd)
interfaces = self._network_state.get("interfaces", {})
self.handle_physical(command)
iface = interfaces.get(command.get("name"), {})
iface["bridge_ports"] = command["bridge_interfaces"]
for param, val in command.get("params", {}).items():
iface.update({param: val})
# convert value to boolean
bridge_stp = iface.get("bridge_stp")
if bridge_stp is not None and type(bridge_stp) != bool:
if bridge_stp in ["on", "1", 1]:
bridge_stp = True
elif bridge_stp in ["off", "0", 0]:
bridge_stp = False
else:
raise ValueError(
"Cannot convert bridge_stp value ({stp}) to"
" boolean".format(stp=bridge_stp)
)
iface.update({"bridge_stp": bridge_stp})
interfaces.update({iface["name"]: iface})
@ensure_command_keys(["name"])
def handle_infiniband(self, command):
self.handle_physical(command)
def _parse_dns(self, command):
nameservers = []
search = []
if "address" in command:
addrs = command["address"]
if not type(addrs) == list:
addrs = [addrs]
for addr in addrs:
nameservers.append(addr)
if "search" in command:
paths = command["search"]
if not isinstance(paths, list):
paths = [paths]
for path in paths:
search.append(path)
return nameservers, search
@ensure_command_keys(["address"])
def handle_nameserver(self, command):
dns = self._network_state.get("dns")
nameservers, search = self._parse_dns(command)
if "interface" in command:
self._interface_dns_map[command["interface"]] = (
nameservers,
search,
)
else:
dns["nameservers"].extend(nameservers)
dns["search"].extend(search)
@ensure_command_keys(["address"])
def _handle_individual_nameserver(self, command, iface):
_iface = self._network_state.get("interfaces")
nameservers, search = self._parse_dns(command)
_iface[iface]["dns"] = {"nameservers": nameservers, "search": search}
@ensure_command_keys(["destination"])
def handle_route(self, command):
self._network_state["routes"].append(_normalize_route(command))
# V2 handlers
def handle_bonds(self, command):
"""
v2_command = {
bond0: {
'interfaces': ['interface0', 'interface1'],
'parameters': {
'mii-monitor-interval': 100,
'mode': '802.3ad',
'xmit_hash_policy': 'layer3+4'}},
bond1: {
'bond-slaves': ['interface2', 'interface7'],
'parameters': {
'mode': 1,
}
}
}
v1_command = {
'type': 'bond'
'name': 'bond0',
'bond_interfaces': [interface0, interface1],
'params': {
'bond-mode': '802.3ad',
'bond_miimon: 100,
'bond_xmit_hash_policy': 'layer3+4',
}
}
"""
self._handle_bond_bridge(command, cmd_type="bond")
def handle_bridges(self, command):
"""
v2_command = {
br0: {
'interfaces': ['interface0', 'interface1'],
'forward-delay': 0,
'stp': False,
'maxwait': 0,
}
}
v1_command = {
'type': 'bridge'
'name': 'br0',
'bridge_interfaces': [interface0, interface1],
'params': {
'bridge_stp': 'off',
'bridge_fd: 0,
'bridge_maxwait': 0
}
}
"""
self._handle_bond_bridge(command, cmd_type="bridge")
def handle_ethernets(self, command):
"""
ethernets:
eno1:
match:
macaddress: 00:11:22:33:44:55
driver: hv_netsvc
wakeonlan: true
dhcp4: true
dhcp6: false
addresses:
- 192.168.14.2/24
- 2001:1::1/64
gateway4: 192.168.14.1
gateway6: 2001:1::2
nameservers:
search: [foo.local, bar.local]
addresses: [8.8.8.8, 8.8.4.4]
lom:
match:
driver: ixgbe
set-name: lom1
dhcp6: true
accept-ra: true
switchports:
match:
name: enp2*
mtu: 1280
command = {
'type': 'physical',
'mac_address': 'c0:d6:9f:2c:e8:80',
'name': 'eth0',
'subnets': [
{'type': 'dhcp4'}
]
}
"""
# Get the interfaces by MAC address to update an interface's
# device name to the name of the device that matches a provided
# MAC address when the set-name directive is not present.
#
# Please see https://bugs.launchpad.net/cloud-init/+bug/1855945
# for more information.
ifaces_by_mac = get_interfaces_by_mac()
for eth, cfg in command.items():
phy_cmd = {
"type": "physical",
}
match = cfg.get("match", {})
mac_address = match.get("macaddress", None)
if not mac_address:
LOG.debug(
'NetworkState Version2: missing "macaddress" info '
"in config entry: %s: %s",
eth,
str(cfg),
)
phy_cmd["mac_address"] = mac_address
# Determine the name of the interface by using one of the
# following in the order they are listed:
# * set-name
# * interface name looked up by mac
# * value of "eth" key from this loop
name = eth
set_name = cfg.get("set-name")
if set_name:
name = set_name
elif mac_address and ifaces_by_mac:
lcase_mac_address = mac_address.lower()
mac = find_interface_name_from_mac(lcase_mac_address)
if mac:
name = mac
phy_cmd["name"] = name
driver = match.get("driver", None)
if driver:
phy_cmd["params"] = {"driver": driver}
for key in ["mtu", "match", "wakeonlan", "accept-ra"]:
if key in cfg:
phy_cmd[key] = cfg[key]
warn_deprecated_all_devices(cfg)
subnets = self._v2_to_v1_ipcfg(cfg)
if len(subnets) > 0:
phy_cmd.update({"subnets": subnets})
LOG.debug("v2(ethernets) -> v1(physical):\n%s", phy_cmd)
self.handle_physical(phy_cmd)
def handle_vlans(self, command):
"""
v2_vlans = {
'eth0.123': {
'id': 123,
'link': 'eth0',
'dhcp4': True,
}
}
v1_command = {
'type': 'vlan',
'name': 'eth0.123',
'vlan_link': 'eth0',
'vlan_id': 123,
'subnets': [{'type': 'dhcp4'}],
}
"""
for vlan, cfg in command.items():
vlan_cmd = {
"type": "vlan",
"name": vlan,
"vlan_id": cfg.get("id"),
"vlan_link": cfg.get("link"),
}
if "mtu" in cfg:
vlan_cmd["mtu"] = cfg["mtu"]
warn_deprecated_all_devices(cfg)
subnets = self._v2_to_v1_ipcfg(cfg)
if len(subnets) > 0:
vlan_cmd.update({"subnets": subnets})
LOG.debug("v2(vlans) -> v1(vlan):\n%s", vlan_cmd)
self.handle_vlan(vlan_cmd)
def handle_wifis(self, command):
LOG.warning(
"Wifi configuration is only available to distros with"
" netplan rendering support."
)
def _v2_common(self, cfg) -> None:
LOG.debug("v2_common: handling config:\n%s", cfg)
for iface, dev_cfg in cfg.items():
if "set-name" in dev_cfg:
set_name_iface = dev_cfg.get("set-name")
if set_name_iface:
iface = set_name_iface
if "nameservers" in dev_cfg:
search = dev_cfg.get("nameservers").get("search", [])
dns = dev_cfg.get("nameservers").get("addresses", [])
name_cmd = {"type": "nameserver"}
if len(search) > 0:
name_cmd.update({"search": search})
if len(dns) > 0:
name_cmd.update({"address": dns})
self.handle_nameserver(name_cmd)
mac_address: Optional[str] = dev_cfg.get("match", {}).get(
"macaddress"
)
if mac_address:
real_if_name = find_interface_name_from_mac(mac_address)
if real_if_name:
iface = real_if_name
self._handle_individual_nameserver(name_cmd, iface)
def _handle_bond_bridge(self, command, cmd_type=None):
"""Common handler for bond and bridge types"""
# inverse mapping for v2 keynames to v1 keynames
v2key_to_v1 = dict(
(v, k) for k, v in NET_CONFIG_TO_V2.get(cmd_type).items()
)
for item_name, item_cfg in command.items():
item_params = dict(
(key, value)
for (key, value) in item_cfg.items()
if key not in NETWORK_V2_KEY_FILTER
)
# We accept both spellings (as netplan does). LP: #1756701
# Normalize internally to the new spelling:
params = item_params.get("parameters", {})
grat_value = params.pop("gratuitious-arp", None)
if grat_value:
params["gratuitous-arp"] = grat_value
v1_cmd = {
"type": cmd_type,
"name": item_name,
cmd_type + "_interfaces": item_cfg.get("interfaces"),
"params": dict((v2key_to_v1[k], v) for k, v in params.items()),
}
if "mtu" in item_cfg:
v1_cmd["mtu"] = item_cfg["mtu"]
warn_deprecated_all_devices(item_cfg)
subnets = self._v2_to_v1_ipcfg(item_cfg)
if len(subnets) > 0:
v1_cmd.update({"subnets": subnets})
LOG.debug("v2(%s) -> v1(%s):\n%s", cmd_type, cmd_type, v1_cmd)
if cmd_type == "bridge":
self.handle_bridge(v1_cmd)
elif cmd_type == "bond":
self.handle_bond(v1_cmd)
else:
raise ValueError(
"Unknown command type: {cmd_type}".format(
cmd_type=cmd_type
)
)
def _v2_to_v1_ipcfg(self, cfg):
"""Common ipconfig extraction from v2 to v1 subnets array."""
def _add_dhcp_overrides(overrides, subnet):
if "route-metric" in overrides:
subnet["metric"] = overrides["route-metric"]
subnets = []
if cfg.get("dhcp4"):
subnet = {"type": "dhcp4"}
_add_dhcp_overrides(cfg.get("dhcp4-overrides", {}), subnet)
subnets.append(subnet)
if cfg.get("dhcp6"):
subnet = {"type": "dhcp6"}
self.use_ipv6 = True
_add_dhcp_overrides(cfg.get("dhcp6-overrides", {}), subnet)
subnets.append(subnet)
gateway4 = None
gateway6 = None
nameservers = {}
for address in cfg.get("addresses", []):
subnet = {
"type": "static",
"address": address,
}
if ":" in address:
if "gateway6" in cfg and gateway6 is None:
gateway6 = cfg.get("gateway6")
subnet.update({"gateway": gateway6})
else:
if "gateway4" in cfg and gateway4 is None:
gateway4 = cfg.get("gateway4")
subnet.update({"gateway": gateway4})
if "nameservers" in cfg and not nameservers:
addresses = cfg.get("nameservers").get("addresses")
if addresses:
nameservers["dns_nameservers"] = addresses
search = cfg.get("nameservers").get("search")
if search:
nameservers["dns_search"] = search
subnet.update(nameservers)
subnets.append(subnet)
routes = []
for route in cfg.get("routes", []):
routes.append(
_normalize_route(
{
"destination": route.get("to"),
"gateway": route.get("via"),
}
)
)
# v2 routes are bound to the interface, in v1 we add them under
# the first subnet since there isn't an equivalent interface level.
if len(subnets) and len(routes):
subnets[0]["routes"] = routes
return subnets
def _normalize_subnet(subnet):
# Prune all keys with None values.
subnet = copy.deepcopy(subnet)
normal_subnet = dict((k, v) for k, v in subnet.items() if v)
if subnet.get("type") in ("static", "static6"):
normal_subnet.update(
_normalize_net_keys(
normal_subnet,
address_keys=(
"address",
"ip_address",
),
)
)
normal_subnet["routes"] = [
_normalize_route(r) for r in subnet.get("routes", [])
]
def listify(snet, name):
if name in snet and not isinstance(snet[name], list):
snet[name] = snet[name].split()
for k in ("dns_search", "dns_nameservers"):
listify(normal_subnet, k)
return normal_subnet
def _normalize_net_keys(network, address_keys=()):
"""Normalize dictionary network keys returning prefix and address keys.
@param network: A dict of network-related definition containing prefix,
netmask and address_keys.
@param address_keys: A tuple of keys to search for representing the address
or cidr. The first address_key discovered will be used for
normalization.
@returns: A dict containing normalized prefix and matching addr_key.
"""
net = {k: v for k, v in network.items() if v or v == 0}
addr_key = None
for key in address_keys:
if net.get(key):
addr_key = key
break
if not addr_key:
message = "No config network address keys [%s] found in %s" % (
",".join(address_keys),
network,
)
LOG.error(message)
raise ValueError(message)
addr = str(net.get(addr_key))
if not is_ip_network(addr):
LOG.error("Address %s is not a valid ip network", addr)
raise ValueError(f"Address {addr} is not a valid ip address")
ipv6 = is_ipv6_network(addr)
ipv4 = is_ipv4_network(addr)
netmask = net.get("netmask")
if "/" in addr:
addr_part, _, maybe_prefix = addr.partition("/")
net[addr_key] = addr_part
if ipv6:
# this supports input of ffff:ffff:ffff::
prefix = ipv6_mask_to_net_prefix(maybe_prefix)
elif ipv4:
# this supports input of 255.255.255.0
prefix = ipv4_mask_to_net_prefix(maybe_prefix)
else:
# In theory this never happens, is_ip_network() should catch all
# invalid networks
LOG.error("Address %s is not a valid ip network", addr)
raise ValueError(f"Address {addr} is not a valid ip address")
elif "prefix" in net:
prefix = int(net["prefix"])
elif netmask and ipv4:
prefix = ipv4_mask_to_net_prefix(netmask)
elif netmask and ipv6:
prefix = ipv6_mask_to_net_prefix(netmask)
else:
prefix = 64 if ipv6 else 24
if "prefix" in net and str(net["prefix"]) != str(prefix):
LOG.warning(
"Overwriting existing 'prefix' with '%s' in network info: %s",
prefix,
net,
)
net["prefix"] = prefix
if ipv6:
# TODO: we could/maybe should add this back with the very uncommon
# 'netmask' for ipv6. We need a 'net_prefix_to_ipv6_mask' for that.
if "netmask" in net:
del net["netmask"]
elif ipv4:
net["netmask"] = net_prefix_to_ipv4_mask(net["prefix"])
return net
def _normalize_route(route):
"""normalize a route.
return a dictionary with only:
'type': 'route' (only present if it was present in input)
'network': the network portion of the route as a string.
'prefix': the network prefix for address as an integer.
'metric': integer metric (only if present in input).
'netmask': netmask (string) equivalent to prefix iff network is ipv4.
"""
# Prune None-value keys. Specifically allow 0 (a valid metric).
normal_route = dict(
(k, v) for k, v in route.items() if v not in ("", None)
)
if "destination" in normal_route:
normal_route["network"] = normal_route["destination"]
del normal_route["destination"]
normal_route.update(
_normalize_net_keys(
normal_route, address_keys=("network", "destination")
)
)
metric = normal_route.get("metric")
if metric:
try:
normal_route["metric"] = int(metric)
except ValueError as e:
raise TypeError(
"Route config metric {} is not an integer".format(metric)
) from e
return normal_route
def _normalize_subnets(subnets):
if not subnets:
subnets = []
return [_normalize_subnet(s) for s in subnets]
def parse_net_config_data(
net_config: dict,
skip_broken: bool = True,
renderer=None, # type: Optional[Renderer]
) -> NetworkState:
"""Parses the config, returns NetworkState object
:param net_config: curtin network config dict
"""
state = None
version = net_config.get("version")
config = net_config.get("config")
if version == 2:
# v2 does not have explicit 'config' key so we
# pass the whole net-config as-is
config = net_config
if version and config is not None:
nsi = NetworkStateInterpreter(
version=version, config=config, renderer=renderer
)
nsi.parse_config(skip_broken=skip_broken)
state = nsi.network_state
if not state:
raise RuntimeError(
"No valid network_state object created from network config. "
"Did you specify the correct version? Network config:\n"
f"{net_config}"
)
return state
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