127 lines
4.3 KiB
Python
Executable File
127 lines
4.3 KiB
Python
Executable File
#!/usr/bin/env python3
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import argparse
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import re
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import sys
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import time
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import traceback
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import psutil
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import checker.nagios as nagios
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from checker.markdown import list_to_markdown_table
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parser = argparse.ArgumentParser(description='Check network interface bandwidth utilization.')
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parser.add_argument('--bandwidth', type=float, required=True, help='Bandwidth speed in Mbps. Used to calculate percentage.')
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parser.add_argument('--critical', type=int, default=75, help='Critical if percent of bandwidth usage is greater than or equal to this.')
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parser.add_argument('--warn', type=int, default=50, help='Warning if percent of bandwidth usage is greater than or equal to this.')
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parser.add_argument('--max', type=int, default=None, help='Set the max value the bandwidth can be. Useful for graphs and whatever.')
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parser.add_argument('--ignore', nargs='*', default=[], help='Interface names to ignore, separated by a space.')
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parser.add_argument('--ignore-re', default=None, help='Regex matching interface names to ignore.')
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args = parser.parse_args()
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# Icinga2 will merge the args to one string
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if len(args.ignore) == 1:
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args.ignore = args.ignore[0].split(' ')
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if args.ignore_re:
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ignore_re = re.compile(args.ignore_re)
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else:
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ignore_re = None
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def get_network_traffic(interface):
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net_io = psutil.net_io_counters(pernic=True)
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if interface in net_io:
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return net_io[interface]
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else:
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raise ValueError(f"Interface '{interface}' not found")
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def calculate_network_traffic(interface, interval=1):
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initial_traffic = get_network_traffic(interface)
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start_time = time.perf_counter()
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# Should be more accurate that time.sleep()
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while True:
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current_time = time.perf_counter()
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elapsed_time = current_time - start_time
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if elapsed_time >= interval:
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break
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final_traffic = get_network_traffic(interface)
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sent_bytes = final_traffic.bytes_sent - initial_traffic.bytes_sent
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recv_bytes = final_traffic.bytes_recv - initial_traffic.bytes_recv
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sent_speed = sent_bytes / elapsed_time
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recv_speed = recv_bytes / elapsed_time
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# Convert bytes per second to megabits per second
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sent_speed_mbps = sent_speed * 8 / (1024 * 1024)
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recv_speed_mbps = recv_speed * 8 / (1024 * 1024)
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return sent_speed_mbps, recv_speed_mbps
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def main():
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data = []
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warn_value = (args.bandwidth * args.warn / 100)
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crit_value = (args.bandwidth * args.critical / 100)
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# Get network interface statistics
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net_io_counters = psutil.net_io_counters(pernic=True)
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# Calculate bandwidth utilization for each interface
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for interface, stats in net_io_counters.items():
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if interface in args.ignore or (ignore_re and ignore_re.search(interface)):
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continue
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sent_speed, recv_speed = calculate_network_traffic(interface)
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bandwidth_utilization = sent_speed + recv_speed
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data.append([interface, sent_speed, recv_speed, bandwidth_utilization, 'none'])
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exit_code = nagios.OK
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critical = []
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warn = []
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ok = []
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perf_data = []
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for i in range(len(data)):
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interface = data[i][0]
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bandwidth_utilization = data[i][3]
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if bandwidth_utilization >= crit_value:
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critical.append(interface)
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state = 'critical'
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exit_code = nagios.CRITICAL
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elif bandwidth_utilization >= warn_value:
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warn.append(interface)
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state = 'warning'
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if exit_code < nagios.WARNING:
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exit_code = nagios.WARNING
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else:
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ok.append(interface)
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state = 'ok'
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data[i][2] = f'[{state.upper()}]'
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perf_data.append(f'{interface}={round(bandwidth_utilization, 2)}Mbps;{warn_value};{crit_value};{f"0;{args.max};" if args.max else ""} ')
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if len(ok):
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print(f'OK: {", ".join(ok)}')
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if len(warn):
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print(f'WARNING: {", ".join(warn)}')
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if len(critical):
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print(f'CRITICAL: {", ".join(critical)}')
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data = [(x[0], f'{round(x[1], 2)} Mbps', x[2]) for x in data]
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data.insert(0, ('Interface', 'Bandwidth', 'State'))
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print(list_to_markdown_table(data, align='left', seperator='!', borders=False))
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print(f' |{"".join(perf_data)}')
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sys.exit(exit_code)
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if __name__ == "__main__":
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try:
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main()
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except Exception as e:
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print(f'UNKNOWN: exception "{e}"')
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print(traceback.format_exc())
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sys.exit(nagios.UNKNOWN)
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