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# This file is part of cloud-init. See LICENSE file for license information. import logging from abc import ABC, abstractmethod from functools import partial from typing import Callable, Dict, Iterable, List, Optional, Type from cloudinit import subp, util from cloudinit.net import eni, netplan, network_manager, networkd from cloudinit.net.netops.iproute2 import Iproute2 from cloudinit.net.network_state import NetworkState LOG = logging.getLogger(__name__) class NoActivatorException(Exception): pass def _alter_interface( cmd: list, device_name: str, warn_on_stderr: bool = True ) -> bool: """Attempt to alter an interface using a command list""" return _alter_interface_callable(partial(subp.subp, cmd), warn_on_stderr) def _alter_interface_callable( callable: Callable, warn_on_stderr: bool = True ) -> bool: """Attempt to alter an interface using a callable this function standardizes logging and response to failure for various activators """ try: _out, err = callable() if len(err): log_stderr = LOG.warning if warn_on_stderr else LOG.debug log_stderr("Received stderr output: %s", err) return True except subp.ProcessExecutionError as e: util.logexc(LOG, "Running interface command %s failed", e.cmd) return False class NetworkActivator(ABC): @staticmethod @abstractmethod def available() -> bool: """Return True if activator is available, otherwise return False.""" raise NotImplementedError() @staticmethod @abstractmethod def bring_up_interface(device_name: str) -> bool: """Bring up interface. Return True is successful, otherwise return False """ raise NotImplementedError() @staticmethod @abstractmethod def bring_down_interface(device_name: str) -> bool: """Bring down interface. Return True is successful, otherwise return False """ raise NotImplementedError() @classmethod def bring_up_interfaces(cls, device_names: Iterable[str]) -> bool: """Bring up specified list of interfaces. Return True is successful, otherwise return False """ return all(cls.bring_up_interface(device) for device in device_names) @classmethod def bring_up_all_interfaces(cls, network_state: NetworkState) -> bool: """Bring up all interfaces. Return True is successful, otherwise return False """ return cls.bring_up_interfaces( [i["name"] for i in network_state.iter_interfaces()] ) @staticmethod def wait_for_network() -> None: """Wait for network to come up.""" raise NotImplementedError() class IfUpDownActivator(NetworkActivator): # Note that we're not overriding bring_up_interfaces to pass something # like ifup --all because it isn't supported everywhere. # E.g., NetworkManager has a ifupdown plugin that requires the name # of a specific connection. @staticmethod def available() -> bool: """Return true if ifupdown can be used on this system.""" return eni.available() @staticmethod def bring_up_interface(device_name: str) -> bool: """Bring up interface using ifup. Return True is successful, otherwise return False """ cmd = ["ifup", device_name] return _alter_interface(cmd, device_name) @staticmethod def bring_down_interface(device_name: str) -> bool: """Bring up interface using ifup. Return True is successful, otherwise return False """ cmd = ["ifdown", device_name] return _alter_interface(cmd, device_name) class IfConfigActivator(NetworkActivator): @staticmethod def available() -> bool: """Return true if ifconfig can be used on this system.""" expected = "ifconfig" search = ["/sbin"] return bool(subp.which(expected, search=search)) @staticmethod def bring_up_interface(device_name: str) -> bool: """Bring up interface using ifconfig <dev> up. Return True is successful, otherwise return False """ cmd = ["ifconfig", device_name, "up"] return _alter_interface(cmd, device_name) @staticmethod def bring_down_interface(device_name: str) -> bool: """Bring up interface using ifconfig <dev> down. Return True is successful, otherwise return False """ cmd = ["ifconfig", device_name, "down"] return _alter_interface(cmd, device_name) class NetworkManagerActivator(NetworkActivator): @staticmethod def available() -> bool: """Return true if NetworkManager can be used on this system.""" return network_manager.available() @staticmethod def bring_up_interface(device_name: str) -> bool: """Bring up connection using nmcli. Return True is successful, otherwise return False """ from cloudinit.net.network_manager import conn_filename filename = conn_filename(device_name) if filename is None: LOG.warning( "Unable to find an interface config file. " "Unable to bring up interface." ) return False cmd = ["nmcli", "connection", "load", filename] if _alter_interface(cmd, device_name): cmd = ["nmcli", "connection", "up", "filename", filename] else: _alter_interface(["nmcli", "connection", "reload"], device_name) cmd = ["nmcli", "connection", "up", "ifname", device_name] return _alter_interface(cmd, device_name) @staticmethod def bring_down_interface(device_name: str) -> bool: """Bring down interface using nmcli. Return True is successful, otherwise return False """ cmd = ["nmcli", "device", "disconnect", device_name] return _alter_interface(cmd, device_name) @classmethod def bring_up_interfaces(cls, device_names: Iterable[str]) -> bool: """Activate network Return True on success """ state = subp.subp( [ "systemctl", "show", "--property=SubState", "NetworkManager.service", ] ).stdout.rstrip() if "SubState=running" != state: LOG.warning( "Expected NetworkManager SubState=running, but detected: %s", state, ) return _alter_interface( ["systemctl", "try-reload-or-restart", "NetworkManager.service"], "all", ) and all(cls.bring_up_interface(device) for device in device_names) class NetplanActivator(NetworkActivator): NETPLAN_CMD = ["netplan", "apply"] @staticmethod def available() -> bool: """Return true if netplan can be used on this system.""" return netplan.available() @staticmethod def bring_up_interface(device_name: str) -> bool: """Apply netplan config. Return True is successful, otherwise return False """ LOG.debug( "Calling 'netplan apply' rather than " "altering individual interfaces" ) return _alter_interface( NetplanActivator.NETPLAN_CMD, "all", warn_on_stderr=False ) @staticmethod def bring_up_interfaces(device_names: Iterable[str]) -> bool: """Apply netplan config. Return True is successful, otherwise return False """ LOG.debug( "Calling 'netplan apply' rather than " "altering individual interfaces" ) return _alter_interface( NetplanActivator.NETPLAN_CMD, "all", warn_on_stderr=False ) @staticmethod def bring_up_all_interfaces(network_state: NetworkState) -> bool: """Apply netplan config. Return True is successful, otherwise return False """ return _alter_interface( NetplanActivator.NETPLAN_CMD, "all", warn_on_stderr=False ) @staticmethod def bring_down_interface(device_name: str) -> bool: """Apply netplan config. Return True is successful, otherwise return False """ LOG.debug( "Calling 'netplan apply' rather than " "altering individual interfaces" ) return _alter_interface( NetplanActivator.NETPLAN_CMD, "all", warn_on_stderr=False ) @staticmethod def wait_for_network() -> None: """On networkd systems, wait for systemd-networkd-wait-online""" # At the moment, this is only supported using the networkd renderer. if network_manager.available(): LOG.debug("NetworkManager is enabled, skipping networkd wait") return NetworkdActivator.wait_for_network() class NetworkdActivator(NetworkActivator): @staticmethod def available() -> bool: """Return true if ifupdown can be used on this system.""" return networkd.available() @staticmethod def bring_up_interface(device_name: str) -> bool: """Return True is successful, otherwise return False""" return _alter_interface_callable( partial(Iproute2.link_up, device_name) ) @staticmethod def bring_up_all_interfaces(network_state: NetworkState) -> bool: """Return True is successful, otherwise return False""" cmd = ["systemctl", "restart", "systemd-networkd", "systemd-resolved"] return _alter_interface(cmd, "all") @staticmethod def bring_down_interface(device_name: str) -> bool: """Return True is successful, otherwise return False""" return _alter_interface_callable( partial(Iproute2.link_down, device_name) ) @staticmethod def wait_for_network() -> None: """Wait for systemd-networkd-wait-online.""" subp.subp( ["systemctl", "start", "systemd-networkd-wait-online.service"] ) # This section is mostly copied and pasted from renderers.py. An abstract # version to encompass both seems overkill at this point DEFAULT_PRIORITY = [ "eni", "netplan", "network-manager", "networkd", "ifconfig", ] NAME_TO_ACTIVATOR: Dict[str, Type[NetworkActivator]] = { "eni": IfUpDownActivator, "netplan": NetplanActivator, "network-manager": NetworkManagerActivator, "networkd": NetworkdActivator, "ifconfig": IfConfigActivator, } def search_activator(priority: List[str]) -> Optional[Type[NetworkActivator]]: """Returns the first available activator from the priority list or None.""" unknown = [i for i in priority if i not in DEFAULT_PRIORITY] if unknown: raise ValueError( f"Unknown activators provided in priority list: {unknown}" ) activator_classes = [NAME_TO_ACTIVATOR[name] for name in priority] return next( ( activator_cls for activator_cls in activator_classes if activator_cls.available() ), None, ) def select_activator( priority: Optional[List[str]] = None, ) -> Type[NetworkActivator]: if priority is None: priority = DEFAULT_PRIORITY selected = search_activator(priority) if not selected: raise NoActivatorException( f"No available network activators found. " f"Searched through list: {priority}" ) LOG.debug( "Using selected activator: %s from priority: %s", selected, priority ) return selected