#!/usr/bin/env python3 # # Copyright (C) 2021 VyOS maintainers and contributors # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License version 2 or later as # published by the Free Software Foundation. # # This program 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 General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. import os import json from ipaddress import ip_address from ipaddress import ip_network from time import sleep from json import dumps as json_write from vyos.config import Config from vyos.configdict import dict_merge from vyos.configdict import node_changed from vyos.util import call from vyos.util import cmd from vyos.util import run from vyos.util import read_file from vyos.util import write_file from vyos.template import inc_ip from vyos.template import is_ipv4 from vyos.template import is_ipv6 from vyos.template import render from vyos.xml import defaults from vyos import ConfigError from vyos import airbag airbag.enable() config_containers_registry = '/etc/containers/registries.conf' config_containers_storage = '/etc/containers/storage.conf' def _cmd(command): if os.path.exists('/tmp/vyos.container.debug'): print(command) return cmd(command) def network_exists(name): # Check explicit name for network, returns True if network exists c = _cmd(f'podman network ls --quiet --filter name=^{name}$') return bool(c) # Common functions def get_config(config=None): if config: conf = config else: conf = Config() base = ['container'] container = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True, no_tag_node_value_mangle=True) # We have gathered the dict representation of the CLI, but there are default # options which we need to update into the dictionary retrived. default_values = defaults(base) # container base default values can not be merged here - remove and add them later if 'name' in default_values: del default_values['name'] container = dict_merge(default_values, container) # Merge per-container default values if 'name' in container: default_values = defaults(base + ['name']) for name in container['name']: container['name'][name] = dict_merge(default_values, container['name'][name]) # Delete container network, delete containers tmp = node_changed(conf, ['container', 'network']) if tmp: container.update({'network_remove' : tmp}) tmp = node_changed(conf, ['container', 'name']) if tmp: container.update({'container_remove' : tmp}) return container def verify(container): # bail out early - looks like removal from running config if not container: return None # Add new container if 'name' in container: for name, container_config in container['name'].items(): if 'network' in container_config: if len(container_config['network']) > 1: raise ConfigError(f'Only one network can be specified for container "{name}"!') # Check if the specified container network exists network_name = list(container_config['network'])[0] if network_name not in container['network']: raise ConfigError(f'Container network "{network_name}" does not exist!') if 'address' in container_config['network'][network_name]: if 'network' not in container_config: raise ConfigError(f'Can not use "address" without "network" for container "{name}"!') address = container_config['network'][network_name]['address'] network = None if is_ipv4(address): network = [x for x in container['network'][network_name]['prefix'] if is_ipv4(x)][0] elif is_ipv6(address): network = [x for x in container['network'][network_name]['prefix'] if is_ipv6(x)][0] # Specified container IP address must belong to network prefix if ip_address(address) not in ip_network(network): raise ConfigError(f'Used container address "{address}" not in network "{network}"!') # We can not use the first IP address of a network prefix as this is used by podman if ip_address(address) == ip_network(network)[1]: raise ConfigError(f'IP address "{address}" can not be used for a container, '\ 'reserved for the container engine!') if 'environment' in container_config: for var, cfg in container_config['environment'].items(): if 'value' not in cfg: raise ConfigError(f'Environment variable {var} has no value assigned!') if 'volume' in container_config: for volume, volume_config in container_config['volume'].items(): if 'source' not in volume_config: raise ConfigError(f'Volume "{volume}" has no source path configured!') if 'destination' not in volume_config: raise ConfigError(f'Volume "{volume}" has no destination path configured!') source = volume_config['source'] if not os.path.exists(source): raise ConfigError(f'Volume "{volume}" source path "{source}" does not exist!') # Container image is a mandatory option if 'image' not in container_config: raise ConfigError(f'Container image for "{name}" is mandatory!') # If 'allow-host-networks' or 'network' not set. if 'allow_host_networks' not in container_config and 'network' not in container_config: raise ConfigError(f'Must either set "network" or "allow-host-networks" for container "{name}"!') # Can not set both allow-host-networks and network at the same time if {'allow_host_networks', 'network'} <= set(container_config): raise ConfigError(f'"allow-host-networks" and "network" for "{name}" cannot be both configured at the same time!') # Add new network if 'network' in container: for network, network_config in container['network'].items(): v4_prefix = 0 v6_prefix = 0 # If ipv4-prefix not defined for user-defined network if 'prefix' not in network_config: raise ConfigError(f'prefix for network "{network}" must be defined!') for prefix in network_config['prefix']: if is_ipv4(prefix): v4_prefix += 1 elif is_ipv6(prefix): v6_prefix += 1 if v4_prefix > 1: raise ConfigError(f'Only one IPv4 prefix can be defined for network "{network}"!') if v6_prefix > 1: raise ConfigError(f'Only one IPv6 prefix can be defined for network "{network}"!') # A network attached to a container can not be deleted if {'network_remove', 'name'} <= set(container): for network in container['network_remove']: for container, container_config in container['name'].items(): if 'network' in container_config and network in container_config['network']: raise ConfigError(f'Can not remove network "{network}", used by container "{container}"!') return None def generate(container): # bail out early - looks like removal from running config if not container: return None if 'network' in container: for network, network_config in container['network'].items(): tmp = { 'cniVersion' : '0.4.0', 'name' : network, 'plugins' : [{ 'type': 'bridge', 'bridge': f'cni-{network}', 'isGateway': True, 'ipMasq': False, 'hairpinMode': False, 'ipam' : { 'type': 'host-local', 'routes': [], 'ranges' : [], }, }] } for prefix in network_config['prefix']: net = [{'gateway' : inc_ip(prefix, 1), 'subnet' : prefix}] tmp['plugins'][0]['ipam']['ranges'].append(net) # install per address-family default orutes default_route = '0.0.0.0/0' if is_ipv6(prefix): default_route = '::/0' tmp['plugins'][0]['ipam']['routes'].append({'dst': default_route}) write_file(f'/etc/cni/net.d/{network}.conflist', json_write(tmp, indent=2)) render(config_containers_registry, 'containers/registry.tmpl', container) render(config_containers_storage, 'containers/storage.tmpl', container) return None def apply(container): # Delete old containers if needed. We can't delete running container # Option "--force" allows to delete containers with any status if 'container_remove' in container: for name in container['container_remove']: call(f'podman stop {name}') call(f'podman rm --force {name}') # Delete old networks if needed if 'network_remove' in container: for network in container['network_remove']: tmp = f'/etc/cni/net.d/{network}.conflist' if os.path.exists(tmp): os.unlink(tmp) # Add container if 'name' in container: for name, container_config in container['name'].items(): image = container_config['image'] if 'disable' in container_config: # check if there is a container by that name running tmp = _cmd('podman ps -a --format "{{.Names}}"') if name in tmp: _cmd(f'podman stop {name}') _cmd(f'podman rm --force {name}') continue memory = container_config['memory'] restart = container_config['restart'] # Check if requested container image exists locally. If it does not, we # pull it. print() is the best way to have a good response from the # polling process to the user to display progress. If the image exists # locally, a user can update it running `update container image <name>` tmp = run(f'podman image exists {image}') if tmp != 0: print(os.system(f'podman pull {image}')) # Add capability options. Should be in uppercase cap_add = '' if 'cap_add' in container_config: for c in container_config['cap_add']: c = c.upper() c = c.replace('-', '_') cap_add += f' --cap-add={c}' # Check/set environment options "-e foo=bar" env_opt = '' if 'environment' in container_config: for k, v in container_config['environment'].items(): env_opt += f" -e \"{k}={v['value']}\"" # Publish ports port = '' if 'port' in container_config: protocol = '' for portmap in container_config['port']: if 'protocol' in container_config['port'][portmap]: protocol = container_config['port'][portmap]['protocol'] protocol = f'/{protocol}' else: protocol = '/tcp' sport = container_config['port'][portmap]['source'] dport = container_config['port'][portmap]['destination'] port += f' -p {sport}:{dport}{protocol}' # Bind volume volume = '' if 'volume' in container_config: for vol, vol_config in container_config['volume'].items(): svol = vol_config['source'] dvol = vol_config['destination'] volume += f' -v {svol}:{dvol}' container_base_cmd = f'podman run --detach --interactive --tty --replace {cap_add} ' \ f'--memory {memory}m --memory-swap 0 --restart {restart} ' \ f'--name {name} {port} {volume} {env_opt}' if 'allow_host_networks' in container_config: run(f'{container_base_cmd} --net host {image}') else: for network in container_config['network']: ipparam = '' if 'address' in container_config['network'][network]: address = container_config['network'][network]['address'] ipparam = f'--ip {address}' run(f'{container_base_cmd} --net {network} {ipparam} {image}') return None def run(container_cmd): counter = 0 while True: if counter >= 10: break try: _cmd(container_cmd) break except: counter = counter +1 sleep(0.5) return None if __name__ == '__main__': try: c = get_config() verify(c) generate(c) apply(c) except ConfigError as e: print(e) exit(1)