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#!/usr/bin/perl
#
# Module: vyatta_update_sysctl.pl
#
# **** License ****
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# A copy of the GNU General Public License is available as
# `/usr/share/common-licenses/GPL' in the Debian GNU/Linux distribution
# or on the World Wide Web at `http://www.gnu.org/copyleft/gpl.html'.
# You can also obtain it by writing to the Free Software Foundation,
# Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
# MA 02110-1301, USA.
#
# This code was originally developed by Vyatta, Inc.
# Portions created by Vyatta are Copyright (C) 2007 Vyatta, Inc.
# All Rights Reserved.
#
# Author: Jason Hendry
# Date: October 2014
# Description: Script to manage sysctl values
#
# **** End License ****
#
use lib "/opt/vyatta/share/perl5/";
use Vyatta::Config;
use Vyatta::File qw(touch);
use Getopt::Long;
use strict;
use warnings;
my $SYSCTL = '/sbin/sysctl';
my (@opts);
sub usage {
print <<EOF;
Usage: $0 --option=<sysctl_option> <value>
EOF
exit 1;
}
GetOptions(
"option=s{2}" => \@opts,
) or usage();
set_sysctl_value(@opts) if (@opts);
exit 0;
sub set_sysctl_value {
my ($sysctl_opt, $nvalue) = @_;
my $ovalue = get_sysctl_value($sysctl_opt);
if ($nvalue ne $ovalue) {
my $cmd = "$SYSCTL -w $sysctl_opt=$nvalue 2>&1 1>&-";
system($cmd);
if ($? >> 8) {
die "exec of $SYSCTL failed: '$cmd'";
}
}
}
sub get_sysctl_value {
my $option = shift;
my $val;
open( my $sysctl, '-|', "$SYSCTL $option 2>&1" ) or die "sysctl failed: $!\n";
while (<$sysctl>) {
chomp;
$val = (split(/ = /, $_))[1];
}
close $sysctl;
return ($val);
}
# net.ipv4.ipfrag_time
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