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#!/usr/bin/perl -w
# -*- perl -*-
use strict;
use warnings;
=head1 NAME
users - Munin plugin to monitor the number of users logged in to a Unix box.
=head1 APPLICABLE SYSTEMS
Should work on any Unix that has the L<who>(1) command.
=head1 CONFIGURATION
None needed
=head1 INTERPRETATION
The plugin simply runs the L<who>(1) command and counts the number of
users logged in by different methods (tty, pty, X, etc).
=head1 BUGS
Logins or sessions that are not registered in C</var/run/utmp> as part
of the session setup will not be counted (this is a feature, not a
bug).
Only tested extensively on Linux.
=head1 MAGIC MARKERS
#%# family=auto
#%# capabilities=autoconf
=head1 AUTHOR
Copyright (C) 2004-2008.
Original version by Michael Kaiser tools (at) micha (dot) de.
Modified and made more generic by Nicolai Langfeldt, 2006
=head1 LICENSE
GPLv2
=cut
use Munin::Plugin;
if ( defined($ARGV[0])) {
if ($ARGV[0] eq 'autoconf') {
print "yes\n";
exit 0;
}
if ( $ARGV[0] eq "config" ) {
print "graph_title Logged in users\n";
print "graph_args --base 1000 -l 0\n";
print "graph_vlabel Users\n";
print "graph_scale no\n";
print "graph_category system\n";
print "graph_printf %3.0lf\n";
print "tty.label tty\n";
print "tty.draw AREASTACK\n";
print "tty.colour 00FF00\n";
print "pty.label pty\n";
print "pty.draw AREASTACK\n";
print "pty.colour 0000FF\n";
print "pts.label pts\n";
print "pts.draw AREASTACK\n";
print "pts.colour 00FFFF\n";
print "X.label X displays\n";
print "X.draw AREASTACK\n";
print "X.info Users logged in on an X display\n";
print "X.colour 000000\n";
print "other.label Other users\n";
print "other.info Users logged in by indeterminate method\n";
print "other.colour FF0000\n";
foreach my $field (qw(tty pty pts X other)) {
print_thresholds($field);
}
exit 0;
}
}
my $tty = 0;
my $pty = 0;
my $pts = 0;
my $X = 0;
my $unc = 0; # Unclassified
open (WHO,"who |");
foreach (<WHO>) {
(undef,$_,undef) = split /[\/ ]+/;
$tty++,next if /ttyv?/; # Linux virtual console tty (on some hosts)
$pty++,next if /pty|ttyp/;
$pts++,next if /pts/;
$tty++,next if /tty/; # Regular tty
$X++,next if (/:\d+/); # Linux style X screen
$X++,next if (/X[0-9a-fA-F]*/); # Solaris style (ifi.uio.no only?)
$unc++;
}
close (WHO);
print "tty.value $tty\n";
print "pty.value $pty\n";
print "pts.value $pts\n";
print "X.value $X\n";
print "other.value $unc\n";
# vim:syntax=perl