This file is indexed.

/usr/share/check_mk/checks/tcp_conn_stats 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.

tcp_conn_stats_states = [
"ESTABLISHED",  # connection up and passing data
"SYN_SENT",     # session has been requested by us; waiting for reply from remote endpoint
"SYN_RECV",     # session has been requested by a remote endpoint for a socket on which we were listening
"LAST_ACK",     # our socket is closed; remote endpoint has also shut down; we are waiting for a final acknowledgement
"CLOSE_WAIT",   # remote endpoint has shut down; the kernel is waiting for the application to close the socket
"TIME_WAIT",    # socket is waiting after closing for any packets left on the network
"CLOSED",       # socket is not being used (FIXME. What does mean?)
"CLOSING",      # our socket is shut down; remote endpoint is shut down; not all data has been sent
"FIN_WAIT1",    # our socket has closed; we are in the process of tearing down the connection
"FIN_WAIT2",    # the connection has been closed; our socket is waiting for the remote endpoint to shut down
]


tcp_conn_stats_default_levels = { }

def inventory_tcp_conn_stats(info):
    if len(info) > 0:
        return [ (None, 'tcp_conn_stats_default_levels') ]

def check_tcp_conn_stats(item, params, info):
    stats = dict(info)
    worst_state = 0
    info = []
    perfdata = []
    for state in tcp_conn_stats_states:
        num = int(stats.get(state, 0))
        if num > 0:
            infotext = "%s: %d" % (state, num)
        else:
            infotext = None
        levels = params.get(state)
        perf = [state, num]
        if levels:
            warn, crit = levels
            perf.append(warn)
            perf.append(crit)
            if num >= crit:
                worst_state = 2
                infotext += "(!!) (critical at %d)" % crit
            elif num >= warn:
                worst_state = max(1, worst_state)
                infotext += "(!) (warning at %d)" % warn
        perfdata.append(perf)
        if infotext:
            info.append(infotext)
    return (worst_state, "%s - %s" % (nagios_state_names[worst_state], ", ".join(info)), perfdata)

check_info['tcp_conn_stats'] = (check_tcp_conn_stats, "TCP Connections", 1, inventory_tcp_conn_stats)