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"""
This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
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 <https://www.gnu.org/licenses/>.
Copyright © 2019 Cloud Linux Software Inc.
This software is also available under ImunifyAV commercial license,
see <https://www.imunify360.com/legal/eula>
"""
from contextlib import suppress
from logging import getLogger
from pathlib import Path
from defence360agent import utils
from defence360agent.contracts.config import ANTIVIRUS_MODE
from defence360agent.contracts.config import MalwareScanSchedule as Config
from defence360agent.contracts.config import (
MalwareScanScheduleInterval as Interval,
)
from defence360agent.contracts.config import SystemConfig
from defence360agent.contracts.license import LicenseCLN
from defence360agent.contracts.messages import MessageType
from defence360agent.contracts.plugins import (
MessageSink,
MessageSource,
expect,
)
from imav.malwarelib.utils import reset_malware_schedule
logger = getLogger(__name__)
AVAILABLE_INTERVALS = [
Interval.NONE,
Interval.DAY,
Interval.WEEK,
Interval.MONTH,
]
AVP_INTERVALS = [
Interval.NONE,
Interval.MONTH,
]
def allowed_schedule_interval():
valid_avp = LicenseCLN.is_valid_av_plus()
condition = (not ANTIVIRUS_MODE) or valid_avp
return AVAILABLE_INTERVALS if condition else AVP_INTERVALS
class ScheduleWatcher(MessageSink, MessageSource):
def __init__(self):
self._cron = self._read_cron()
self._update_cron()
self._sink = None
async def create_sink(self, loop):
pass
async def create_source(self, loop, sink):
self._sink = sink
@staticmethod
def _read_cron():
with suppress(FileNotFoundError):
return Path(Config.CRON_PATH).read_text()
@staticmethod
def _write_cron(job):
path = Path(Config.CRON_PATH)
with suppress(FileNotFoundError):
path.unlink()
if job:
path.touch(mode=0o600)
path.write_text(job)
def _get_job(self):
if Config.INTERVAL == Interval.NONE:
return None
elif Config.INTERVAL not in AVAILABLE_INTERVALS:
logger.error("Unsupported interval value: %s", Config.INTERVAL)
return self._cron
elif Config.INTERVAL not in allowed_schedule_interval():
logger.info("Malware schedule interval is being reset to defaults")
reset_malware_schedule()
schedule_schema = {
Interval.DAY: (Config.HOUR, "*", "*"),
Interval.WEEK: (Config.HOUR, "*", Config.DAY_OF_WEEK),
Interval.MONTH: (Config.HOUR, Config.DAY_OF_MONTH, "*"),
}
schedule = schedule_schema[Config.INTERVAL]
job = Config.CRON_STRING.format(*schedule, cmd=Config.CMD)
return job
def _update_cron(self):
job = self._get_job()
if self._cron != job:
logger.info("Update background scan schedule")
self._write_cron(job)
self._cron = job
return True
return False
async def _stop_background_scan(self):
await self._sink.process_message(
MessageType.MalwareScanQueueStopBackground()
)
@expect(MessageType.ConfigUpdate)
@utils.log_error_and_ignore()
async def schedule_config_updated(self, message):
if isinstance(message["conf"], SystemConfig):
if self._update_cron() and not self._cron:
await self._stop_background_scan()