This file is indexed.

/usr/share/check_mk/checks/netctr is in check-mk-server 1.1.12-1ubuntu1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/usr/bin/python
# -*- encoding: utf-8; py-indent-offset: 4 -*-
# +------------------------------------------------------------------+
# |             ____ _               _        __  __ _  __           |
# |            / ___| |__   ___  ___| | __   |  \/  | |/ /           |
# |           | |   | '_ \ / _ \/ __| |/ /   | |\/| | ' /            |
# |           | |___| | | |  __/ (__|   <    | |  | | . \            |
# |            \____|_| |_|\___|\___|_|\_\___|_|  |_|_|\_\           |
# |                                                                  |
# | Copyright Mathias Kettner 2010             mk@mathias-kettner.de |
# +------------------------------------------------------------------+
#
# This file is part of Check_MK.
# The official homepage is at http://mathias-kettner.de/check_mk.
#
# check_mk 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 in version 2.  check_mk is  distributed
# in the hope that it will be useful, but WITHOUT ANY WARRANTY;  with-
# out even the implied warranty of  MERCHANTABILITY  or  FITNESS FOR A
# PARTICULAR PURPOSE. See the  GNU General Public License for more de-
# ails.  You should have  received  a copy of the  GNU  General Public
# License along with GNU Make; see the file  COPYING.  If  not,  write
# to the Free Software Foundation, Inc., 51 Franklin St,  Fifth Floor,
# Boston, MA 02110-1301 USA.

linux_nic_check = "lnx_if"

# levels for warning/critical on error rate - in percentage of total packets!
netctr_default_params = (0.01, 0.1)

netctr_counters  = [ 'rx_bytes', 'tx_bytes', 'rx_packets', 'tx_packets', 'rx_errors', 'tx_errors', 'tx_collisions' ]

# Check counters from network interfaces
# Item is devicename.countername, eg,
# eth0.tx_collisions. Available are:

netctr_counter_indices = {
  # Receive
  'rx_bytes'      : 0,
  'rx_packets'    : 1,
  'rx_errors'     : 2,
  'rx_drop'       : 3,
  'rx_fifo'       : 4,
  'rx_frame'      : 5,
  'rx_compressed' : 6,
  'rx_multicast'  : 7,
  # Transmit
  'tx_bytes'      : 8,
  'tx_packets'    : 9,
  'tx_errors'     : 10,
  'tx_drop'       : 11,
  'tx_fifo'       : 12,
  'tx_collisions' : 13,
  'tx_carrier'    : 14,
  'tx_compressed' : 15 }

def inventory_netctr_combined(info):
    if linux_nic_check != "legacy":
        return []
    if len(info) == 0:
        return []
    return [ (l[0], '', 'netctr_default_params') for l in info[1:] if l[0] != 'lo' and not l[0].startswith("sit") ]


def check_netctr_combined(nic, params, info):
    try:
        warn, crit = params
    except:
        warn, crit = (0.01, 0.1)

    global netctr_counter_indices
    this_time = int(info[0][0])

    # Look for line describing this nic
    for nicline in info[1:]:
        if nicline[0] != nic: continue
        perfdata = []
        infotxt = ""
        problems_per_sec = 0.0
        packets_per_sec = 0.0
        counter_wrapped = None
        for countername in netctr_counters:
            index = netctr_counter_indices[countername]
            value = int(nicline[index + 1])
            try:
                timedif, items_per_sec = get_counter( "netctr." + nic + "." + countername, this_time, value)
                perfdata.append( ( countername, "%dc" % value ) )
            except MKCounterWrapped, e:
                counter_wrapped = e
                # Important: continue counter loop, so that *all* counters get initialized.
                # Otherwise this checks would need 7 check cycles until the first result
                # would be produced
                continue

            if countername in [ "rx_errors", "tx_errors", "tx_collisions" ]:
                problems_per_sec += items_per_sec
            elif countername in [ "rx_packets", "tx_packets" ]:
                packets_per_sec += items_per_sec
            if countername == 'rx_bytes':
                infotxt += ' - Receive: %.2f MB/sec' % (float(items_per_sec) / float(1024*1024))
            elif countername == 'tx_bytes':
                infotxt += ' - Send: %.2f MB/sec' % (float(items_per_sec) / float(1024*1024))

        # if at least one counter wrapped, we cannot send or use performance
        # data and leave out this check for this turn
        if counter_wrapped:
            raise counter_wrapped

        error_percentage = 0.0
        if problems_per_sec > 0:
            error_percentage = (problems_per_sec / packets_per_sec) * 100.0
            infotxt += ", error rate %.4f%%" % error_percentage
        if error_percentage >= crit:
            return (2, "CRIT" + infotxt, perfdata)
        elif error_percentage >= warn:
            return (1, "WARNING" + infotxt, perfdata)
        else:
            return (0, "OK" + infotxt, perfdata)

    return (3, "UNKNOWN - NIC is not present")


check_info['netctr.combined'] = (check_netctr_combined, "NIC %s counters", 1,  inventory_netctr_combined )
check_config_variables.append("netctr_counters")