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//opt/cloudlinux/venv/lib64/python3.11/site-packages/wmt/wmt-api.py

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#!/opt/cloudlinux/venv/bin/python3

import json
import fcntl
import os
import time
import sys
import syslog
import psutil
import signal
from argparse import ArgumentParser
from datetime import datetime, timedelta

from wmt.common.const import (
    WMT_SCANNER_SERVICE,
    WMT_LOCK_FILE,
    CONFIG_PATH,
    WMT_DB
)

from wmt.common.report import generate_report, report_dict
from wmt.db import setup_database
from wmt.common.service import set_service_state
from wmt.common.notification import Notifier, SupportedNotificationTypes
from wmt.common import cfg

from cllicense import CloudlinuxLicenseLib
from wmt.common.utils import send_report_to_clickhouse, manage_crons

def print_result_and_exit(result='success', exit_code=0, **extra):
    message = {
        'result': result,
        'timestamp': time.time()
    }
    message.update(extra)
    print(json.dumps(message,
                     indent=2,
                     sort_keys=True))
    sys.exit(exit_code)

def _audit_log(action, details=''):
    uid = os.getuid()
    try:
        user = os.getlogin()
    except OSError:
        user = str(uid)
    syslog.openlog('wmt-api', syslog.LOG_PID, syslog.LOG_AUTH)
    syslog.syslog(syslog.LOG_INFO,
                   f'action={action} uid={uid} user={user} {details}')
    syslog.closelog()

def get_status():
    if not os.path.exists(WMT_LOCK_FILE):
        return 'stopped'
    with open(WMT_LOCK_FILE) as f:
        try:
            fcntl.flock(f.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB)
        # locked
        except OSError:
            return 'started'
    return 'stopped'

def get_scanner_pid():
    if not os.path.exists(WMT_LOCK_FILE):
        return None
    with open(WMT_LOCK_FILE) as f:
        # Probe the lock the same way get_status does. The running daemon
        # holds LOCK_EX for its entire lifetime, so:
        #   - LOCK_SH succeeds (no contention) -> daemon is NOT running.
        #     Any PID still in the file is stale (crash / SIGKILL) and
        #     may have been reused by an unrelated process; do not
        #     return it (avoids os.kill(stale_pid, SIGUSR1)).
        #   - LOCK_SH fails (EWOULDBLOCK) -> daemon is alive and the PID
        #     in the file is current. Read it without holding the lock;
        #     the truncate-after-lock in save_pid_and_lock guarantees the
        #     file is either empty or a complete PID.
        try:
            fcntl.flock(f.fileno(), fcntl.LOCK_SH | fcntl.LOCK_NB)
        except OSError:
            data = f.read().strip()
        else:
            fcntl.flock(f.fileno(), fcntl.LOCK_UN)
            return None
    if not data:
        return None
    try:
        pid = int(data)
    except ValueError:
        return None
    return pid if psutil.pid_exists(pid) else None

def get_config():
    return cfg.to_dict()

def change_config(new_json_config):
    old_config = cfg.to_dict()
    config = cfg.modify(new_json_config)
    changed = {k: {'old': old_config.get(k), 'new': config.get(k)}
               for k in config if config.get(k) != old_config.get(k)}
    _audit_log('config-change', f'changed={json.dumps(changed)}')
    scanner_pid = get_scanner_pid()
    if scanner_pid is not None:
        os.kill(scanner_pid, signal.SIGUSR1)
    return config

def run():
    args = ArgumentParser()
    args.add_argument('--config-get', action='store_true')
    args.add_argument('--config-change', type=str)

args.add_argument('--report-get', action='store_true')
    args.add_argument('--send-clickhouse', action='store_true')
    # just for 24h report by mail executed by cron
    args.add_argument('--send-email', action='store_true')

args.add_argument('--status', action='store_true')
    args.add_argument('--start', action='store_true')
    args.add_argument('--stop', action='store_true')

opts = args.parse_args()

if opts.config_get:
        config = get_config()
        config['default_report_email'] = cfg.default_report_email

if config.get("ignore_list"):
            tmp_val = ",".join(config.get("ignore_list"))
            config['ignore_list'] = tmp_val
        print_result_and_exit(config=config)

elif opts.config_change:
        config = change_config(opts.config_change)
        config['default_report_email'] = cfg.default_report_email
        print_result_and_exit(config=config)

elif opts.report_get:
        engine = setup_database(readonly=os.path.exists(WMT_DB))
        # 24h back from NOW
        start, end = datetime.now() - timedelta(days=1), datetime.now()
        report = report_dict(generate_report(engine, start, end))
        print_result_and_exit(report=report, date=datetime.now().strftime('%Y-%m-%d %H:%M'))
    elif opts.send_clickhouse:
        engine = setup_database(readonly=True)
        # for the day before
        start, end = datetime.now().date() - timedelta(days=1), datetime.now().date()
        send_report_to_clickhouse(report_dict(generate_report(engine, start, end)))
        _audit_log('send-clickhouse')
        print_result_and_exit()
    elif opts.send_email:
        is_scanner_running = get_status() == 'started'
        if is_scanner_running and cfg.cfg.summary_notification_enabled:
            if not CloudlinuxLicenseLib().get_license_status():
                print_result_and_exit('CloudLinux license is expired. '
                                      'You may buy new license here: https://lp.cloudlinux.com/cloudlinux-os-solo',
                                      exit_code=1)
            engine = setup_database()
            start, end = datetime.now().date() - timedelta(days=1), datetime.now().date()
            report = generate_report(engine, start, end)
            Notifier(
                target_email=cfg.target_email,
                from_email=cfg.from_email,
                report=report, notification_type=SupportedNotificationTypes.REPORT,
            ).notify()
            _audit_log('send-email', f'target={cfg.target_email}')
            print_result_and_exit()
        else:
            print_result_and_exit('Summary report email will not be sent! '
                                  f'Please, ensure "{WMT_SCANNER_SERVICE}" service is running and '
                                  f'alert_notifications is enabled in "{CONFIG_PATH}"', exit_code=1)
    elif opts.status:
        status = get_status()
        print_result_and_exit(status=status)
    elif opts.start:
        # Bugbot 0698f84b: audit AFTER set_service_state succeeds, so a
        # failure path doesn't record a phantom service-start event.
        set_service_state(WMT_SCANNER_SERVICE, 'start')
        manage_crons(status=True)
        _audit_log('service-start', f'service={WMT_SCANNER_SERVICE}')
        print_result_and_exit()
    elif opts.stop:
        set_service_state(WMT_SCANNER_SERVICE, 'stop')
        manage_crons(status=False)
        _audit_log('service-stop', f'service={WMT_SCANNER_SERVICE}')
        print_result_and_exit()
    else:
        args.print_help()

def main():
    try:
        run()
    except Exception as e:
        print_result_and_exit(result='error', exit_code=1, context=str(e))

if __name__ == '__main__':
    main()

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