#!/usr/bin/perl -wT

# (c) 2003 by Peter Palfrader
#
# mrtg memory and swap usage check
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


use strict;
use English;

my $IFACE = shift @ARGV;
die ("Usage: $PROGRAM_NAME <interface>") unless defined $IFACE;

$ENV{'PATH'} = '/bin:/usr/bin';
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};

$UID=$EUID;

open(FOO, "/proc/net/dev") || die "$0: can't open /proc/net/dev: $!";
my @dev = <FOO>;
close FOO;

my $dev = join '', @dev;

my ($in, $out) = $dev =~ /^\s*$IFACE:\s*(\d+)\s+\d+\s+\d+\s+\d+\s+\d+\s+\d+\s+\d+\s+\d+\s+(\d+)/m;

defined $in or
	$in = 0,
	warn ("Incoming bytes not found for $IFACE\n");
defined $out or
	$out = 0,
	warn ("Outgoing bytes not found for $IFACE\n");

my $uptime=`/usr/bin/uptime`;
my $hostname=`/bin/hostname`;
print $in,"\n";
print $out,"\n";
printf "%s%s", $uptime, $hostname;