#!/bin/sh
# Copyright (C) 2019 Checkmk GmbH - License: GNU General Public License v2
# This file is part of Checkmk (https://checkmk.com). It is subject to the terms and
# conditions defined in the file COPYING, which is part of this source code package.

# Reason for this no-op: shellcheck disable=... before the first command disables the error for the
# entire script.
:

# Disable unused variable error (needed to keep track of version)
# shellcheck disable=SC2034
CMK_VERSION="2.3.0p38"

# This is not part of the standard agent since it can take very
# long to run if your TCP/UDP table is large. Netstat seems to
# have an execution time complexity of at least O(n^2) on Linux.

echo '<<<netstat>>>'
netstat -an -P tcp -f inet | awk '{printf "%s" "\ntcp\t", $0}' | awk '{printf ("%s %s %s %s %s %s\n", $1, $7, $5, $2, $3, $8)}' | awk 'NR>4' | sed -e 's/LISTEN/LISTENING/g' | sed '$d'

netstat -an -P udp -f inet | awk '{printf "%s" "\nudp\t", $0}' | awk '{printf "%s - - %s %s\n", $1, $2, "0.0.0.0:*"}' | awk 'NR>4' | sed -e '$d'