#!/usr/bin/env python3 # # Copyright (C) 2023 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 from sys import exit from vyos.config import Config from vyos.configdict import dict_merge from vyos.template import render from vyos.util import call from vyos.validate import is_addr_assigned from vyos.xml import defaults from vyos import ConfigError from vyos import airbag airbag.enable() hsflowd_conf_path = '/run/sflow/hsflowd.conf' systemd_service = 'hsflowd.service' systemd_override = f'/run/systemd/system/{systemd_service}.d/override.conf' def get_config(config=None): if config: conf = config else: conf = Config() base = ['system', 'sflow'] if not conf.exists(base): return None sflow = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=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) sflow = dict_merge(default_values, sflow) # Ignore default XML values if config doesn't exists # Delete key from dict if 'port' in sflow['server']: del sflow['server']['port'] # Set default values per server if 'server' in sflow: for server in sflow['server']: default_values = defaults(base + ['server']) sflow['server'][server] = dict_merge(default_values, sflow['server'][server]) return sflow def verify(sflow): if not sflow: return None # Check if configured sflow agent-address exist in the system if 'agent_address' in sflow: tmp = sflow['agent_address'] if not is_addr_assigned(tmp): raise ConfigError( f'Configured "sflow agent-address {tmp}" does not exist in the system!' ) # Check if at least one interface is configured if 'interface' not in sflow: raise ConfigError( 'sFlow requires at least one interface to be configured!') # Check if at least one server is configured if 'server' not in sflow: raise ConfigError('You need to configure at least one sFlow server!') # return True if all checks were passed return True def generate(sflow): if not sflow: return None render(hsflowd_conf_path, 'sflow/hsflowd.conf.j2', sflow) render(systemd_override, 'sflow/override.conf.j2', sflow) # Reload systemd manager configuration call('systemctl daemon-reload') def apply(sflow): if not sflow: # Stop flow-accounting daemon and remove configuration file call(f'systemctl stop {systemd_service}') if os.path.exists(hsflowd_conf_path): os.unlink(hsflowd_conf_path) return # Start/reload flow-accounting daemon call(f'systemctl restart {systemd_service}') if __name__ == '__main__': try: config = get_config() verify(config) generate(config) apply(config) except ConfigError as e: print(e) exit(1)