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#!/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']
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)
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