#!/bin/sh

# Copyright 2023, Mark Schouten <mark@tuxis.nl>, Tuxis B.V.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

SYSCTL=/sbin/sysctl

error() {
    echo "$1"
    exit 2
}

ok() {
    echo "$1"
    exit 0
}

[ -x ${SYSCTL} ] || error "${SYSCTL} is not executable for us" 
[ -z $1 ] && error "Which sysctl do you want to check?"
[ -z $2 ] && error "We need a value for the requested sysctl!"


KEY=$1
VAL=$2

sysval=$(${SYSCTL} -bn ${KEY} 2>&1)

if [ $? -eq 0 ]; then
    if [ "A${VAL}" = "A${sysval}" ]; then
        ok "Value for ${KEY} is as expected: ${VAL}"
    else
        error "Value for ${KEY} is unexpected: ${VAL} != ${sysval}"
    fi
else
    error "Error running sysctl: ${sysval}"
fi
