#!/usr/bin/env python3 import argparse import sys import time import traceback from ipaddress import ip_network import numpy as np import requests from urllib3.exceptions import InsecureRequestWarning import checker.nagios as nagios from checker import print_icinga2_check_status from checker.http import fetch_with_retry from checker.linuxfabric.base import get_state from checker.markdown import list_to_markdown_table from checker.units import filesize def is_internet_traffic(ip): private_networks = [ ip_network("10.0.0.0/8"), ip_network("172.16.0.0/12"), ip_network("192.168.0.0/16"), ] return not any(ip in network for network in private_networks) def get_traffic_top(args, interface): response = fetch_with_retry(f'https://{args.opnsense}/api/diagnostics/traffic/top/{interface}', headers={'Accept': 'application/json'}, auth=(args.key, args.secret), verify=False, timeout=args.timeout) if response.status_code != 200: print(f'UNKNOWN: unable to query OPNsense API for {interface}: {response.status_code}\n{response.text}') sys.exit(nagios.UNKNOWN) return response.json() def main(): parser = argparse.ArgumentParser(description='Check OPNsense network traffic for a host.') parser.add_argument('--opnsense', required=True, help='OPNsense hostname or IP address.') parser.add_argument('--key', required=True, help='OPNsense API key.') parser.add_argument('--secret', required=True, help='OPNsense API secret.') parser.add_argument('--interface', required=True, help='Interface to check (e.g., lan). Can be something like "lan,wan"') parser.add_argument('--host', required=True, help='Address of the host to check.') parser.add_argument('--duration', default=10, type=int, help='How many seconds to gather statistics.') parser.add_argument('--fail-empty', action='store_true', help='If the API did not return any data, fail with UNKNOWN. Otherwise, assume that there was no traffic.') parser.add_argument('--bandwidth', type=float, required=True, help='Bandwidth speed in Mbps. Used to calculate percentage.') parser.add_argument('--bandwidth-crit', type=int, default=75, help='Critical if percent of bandwidth usage is greater than or equal to this.') parser.add_argument('--bandwidth-warn', type=int, default=50, help='Warning if percent of bandwidth usage is greater than or equal to this.') parser.add_argument('--conn-crit', type=int, default=-1, help='Set critical level for number of connections. Default: -1 (disabled).') parser.add_argument('--conn-warn', type=int, default=-1, help='Set warning level for number of connections. Default: -1 (disabled).') parser.add_argument('--timeout', type=int, default=10, help='Timeout in seconds for the HTTP requests to OPNsense. Default: 10.') args = parser.parse_args() check_result = {} interface_names = {} requests.packages.urllib3.disable_warnings(category=InsecureRequestWarning) # Map interface names to their internal names interfaces_mapping = requests.get(f'https://{args.opnsense}/api/diagnostics/traffic/interface', headers={'Accept': 'application/json'}, auth=(args.key, args.secret), verify=False, timeout=args.timeout) if interfaces_mapping.status_code != 200: print( f'UNKNOWN: unable to query OPNsense API for interface mappings: {interfaces_mapping.status_code}\n{interfaces_mapping.text}') sys.exit(nagios.UNKNOWN) interfaces_mapping = interfaces_mapping.json()['interfaces'] interfaces_to_check = set(args.interface.split(',')) for name, interface in interfaces_mapping.items(): if interface['name'] in interfaces_to_check: interfaces_to_check.remove(interface['name']) interface_names[interface['name']] = name if not len(interface_names.keys()): print_icinga2_check_status('did not find any valid interface names! Double-check the name.', nagios.STATE_UNKNOWN) sys.exit(nagios.UNKNOWN) for name, interface in interface_names.items(): # Fetch the data traffic_data = [] for _ in range(args.duration): start_time = time.time() response = fetch_with_retry(f'https://{args.opnsense}/api/diagnostics/traffic/top/{interface}', headers={'Accept': 'application/json'}, auth=(args.key, args.secret), verify=False, timeout=args.timeout) end_time = time.time() api_request_time = end_time - start_time if isinstance(response.json(), list): print_icinga2_check_status(f'OPNsense returned wrong datatype:\n{response.text}', nagios.STATE_UNKNOWN) sys.exit(nagios.STATE_UNKNOWN) for item in response.json().get(interface, {}).get('records', False): if item['address'] == args.host: traffic_data.append(item) adjusted_sleep_duration = max(1 - api_request_time, 0) time.sleep(adjusted_sleep_duration) if not len(traffic_data) and args.fail_empty: print_icinga2_check_status(f'interface or host not found in OPNsense API response. Raw response:\n{traffic_data}', nagios.STATE_UNKNOWN) sys.exit(nagios.UNKNOWN) elif not len(traffic_data): # There was no traffic. check_result[name] = { 'rate_in': 0, 'rate_out': 0, 'cumulative_in': 0, 'cumulative_out': 0, 'connections': 0 } else: try: check_result[name] = { 'rate_in': np.average([x['rate_bits_in'] for x in traffic_data]), 'rate_out': np.average([x['rate_bits_out'] for x in traffic_data]), 'cumulative_in': np.average([x['cumulative_bytes_in'] for x in traffic_data]), 'cumulative_out': np.average([x['cumulative_bytes_out'] for x in traffic_data]), 'connections': int(np.average([len(x['details']) for x in traffic_data])) } except Exception as e: print_icinga2_check_status(f'failed to parse traffic data: {e}\n{traceback.format_exc()}\n{traffic_data}', nagios.STATE_UNKNOWN) sys.exit(nagios.UNKNOWN) warn_b_value = int((args.bandwidth * args.bandwidth_warn / 100) * 1e+6) crit_b_value = int((args.bandwidth * args.bandwidth_crit / 100) * 1e+6) conn_warn = args.conn_warn if args.conn_warn > -1 else None conn_crit = args.conn_crit if args.conn_crit > -1 else None exit_code = nagios.OK critical = [] warn = [] ok = [] perf_data = {} output_table = [ ('Interface', 'Rate In', 'Rate Out', 'Cumulative In', 'Cumulative Out', 'Connections', 'Status') ] def check(name, state, value, do_filesize=True): # TODO: improve this its kinda messy def do_value(v): # TODO: make filesize() handle rate return filesize(v) + 'ps' if do_filesize else v nonlocal exit_code if state == nagios.STATE_CRIT: critical.append((name, do_value(value))) exit_code = max(nagios.STATE_CRIT, exit_code) return nagios.STATE_CRIT elif state == nagios.STATE_WARN: warn.append((name, do_value(value))) exit_code = max(nagios.STATE_WARN, exit_code) return nagios.STATE_WARN elif state == nagios.STATE_OK: exit_code = max(nagios.STATE_OK, exit_code) ok.append((name, do_value(value))) return nagios.STATE_OK for name, data in check_result.items(): in_state = get_state(data['rate_in'], warn_b_value, crit_b_value, 'ge') in_exit_code = check(f'{name}_rate_in', in_state, data['rate_in']) out_state = get_state(data['rate_out'], warn_b_value, crit_b_value, 'ge') out_exit_code = check(f'{name}_rate_out', out_state, data['rate_out']) conn_state = get_state(data['connections'], conn_warn, conn_crit, 'ge') conn_exit_code = check(f'{name}_connections', conn_state, data['connections'], do_filesize=False) interface_status_code = max(in_exit_code, out_exit_code, conn_exit_code) if interface_status_code == nagios.STATE_OK: interface_status = '[OK]' elif interface_status_code == nagios.STATE_WARN: interface_status = '[WARNING]' elif interface_status_code == nagios.STATE_CRIT: interface_status = '[CRITICAL]' else: interface_status = '[UNKNOWN]' perf_data[f'{name}_rate_in'] = {'value': int(data["rate_in"]), 'warn': warn_b_value, 'crit': crit_b_value, 'min': 0, 'unit': 'B'} perf_data[f'{name}_rate_out'] = {'value': int(data["rate_out"]), 'warn': warn_b_value, 'crit': crit_b_value, 'min': 0, 'unit': 'B'} perf_data[f'{name}_cumulative_in'] = {'value': int(data["cumulative_in"]), 'warn': warn_b_value, 'crit': crit_b_value, 'min': 0, 'unit': 'B'} perf_data[f'{name}_cumulative_out'] = {'value': int(data["cumulative_out"]), 'warn': warn_b_value, 'crit': crit_b_value, 'min': 0, 'unit': 'B'} perf_data[f'{name}_connections'] = {'value': int(data["connections"]), 'warn': conn_warn, 'crit': conn_crit, 'min': 0} output_table.append((name, filesize(data['rate_in']), filesize(data['rate_out']), filesize(data['cumulative_in']), filesize(data['cumulative_out']), data['connections'], interface_status)) text_result = ', '.join(f'{name}: {rate}' for name, rate in [*critical, *warn, *ok]) if len(check_result) > 1: text_result = text_result + '\n' + list_to_markdown_table(output_table, align='left', seperator='!', borders=False) print_icinga2_check_status(text_result, exit_code, perf_data) sys.exit(exit_code) if __name__ == "__main__": try: main() except Exception as e: print_icinga2_check_status(f'exception "{e}"\n{traceback.format_exc()}', nagios.STATE_UNKNOWN) sys.exit(nagios.UNKNOWN)