[Nagiosplug-help] check_connections.pl

[Mark S Parrish]

Hello!

If this is the wrong list to submit this, please let me know.

I just set up Nagios on a server.  I can't get this plugin to work  
with check_nrpe.

On the remote machine -192.168.254.11 (it works fine):
/usr/local/nagios/etc/nrpe.cfg
...
command[check_powerterm]=/usr/local/nagios/libexec/ 
check_connections.pl -w 80 -c 100 -C PowerTerm

[root at VM libexec]# ./check_connections.pl -w 80 -c 100 -C PowerTerm
OK - Established connections: 36


On the Nagios Server (it always shows "0" connections):
[root at backup libexec]# ./check_nrpe -H 192.168.254.11 -p 5666 -c  
check_powerterm
OK - Established connections: 0

I was wondering why this always shows "0" Established connections...?
I am using the check_nrpe plugin for lots of other plugins. All work  
fine.

Thanks!

Mark


***********
check_connections.pl

#!/usr/bin/perl -w
## Nagios Plugin for checking the number of established network  
connections
## You can check the number of established network connections of a  
specific user
## or the number of network connections of a given command. Those two  
options
## can be combined.
##
## Note: This script uses lsof with sudo.
## Make sure your /etc/sudoers is properly configured.
## For example put the following line into /etc/sudoers
##      nagios      ALL=NOPASSWD: /usr/sbin/lsof
## Please refer to the manpages for further options.
##
## Copyright 2007 Benjamin Hackl
## Released under the LGPL,
## visit http://www.gnu.org/licenses/lgpl.html for details.

use POSIX;
use strict;
use Getopt::Long;

use vars qw($opt_V $opt_h $PROGNAME $opt_w $opt_c $opt_t $opt_u $opt_C  
$status);
use lib  "/usr/local/nagios/libexec/";
use utils qw(%ERRORS &print_revision &support &usage );
use vars qw($PROGNAME);

my $count = 0;
my $exit_mode;
my $lsof_bin = "sudo /usr/sbin/lsof";
my $lsof_option = '';

sub print_help ();
sub print_usage ();
sub process_arguments ();

Getopt::Long::Configure('bundling');
$status = process_arguments();
if ($status) {
    print("ERROR: processing arguments\n");
    exit $ERRORS{"UNKNOWN"};
}

$SIG{'ALRM'} = sub {
    print("ERROR: Timed out.");
    exit $ERRORS{"WARNING"};
};

if (!$opt_u && !$opt_C) {
   print("ERROR: specify either a loginname or a command.\n");
   exit $ERRORS{"WARNING"};
}

if ($opt_u && $opt_u !~ m/\d+|\w+/) {
   print("ERROR: user must be an uid or a login name.\n");
   exit $ERRORS{"WARNING"};
}

##
if ($opt_u) {
   $lsof_option .= "-u $opt_u ";
}
if ($opt_C) {
   $lsof_option .= "-c $opt_C ";
}

if (!(open(LSOF, "$lsof_bin -n -P -a $lsof_option -i | "))) {
	print "ERROR: could not open lsof!\n";
	exit $ERRORS{'UNKNOWN'};
}


while (<LSOF>) {
	chomp();
	if (/ESTABLISHED/) {
		# only count established connections
		$count++;
	}
}
close(LSOF);

if ($count >= $opt_c) {
	print "CRITICAL - ";
	$exit_mode = $ERRORS{"CRITICAL"};
} elsif( $count >= $opt_w) {
	print "WARNING - ";
	$exit_mode = $ERRORS{"WARNING"};
} else {
	print "OK - ";
	$exit_mode = $ERRORS{"OK"};
}
print "Established connections: $count\n";
exit $exit_mode;


sub process_arguments() {
    GetOptions
              ("V"   => \$opt_V, "version"    => \$opt_V,
               "h"   => \$opt_h, "help"       => \$opt_h,
               "w=i" => \$opt_w, "warning=i"  => \$opt_w,   # warning  
if above this number
               "c=i" => \$opt_c, "critical=i" => \$opt_c,   # critical  
if above this number
               "t=i" => \$opt_t, "timeout=i"  => \$opt_t,
               "u=s" => \$opt_u, "user=s"     => \$opt_u,   # username  
or uid
               "C=s" => \$opt_C, "command=s"  => \$opt_C    # programm  
name
               );

    if ($opt_V) {
      print_revision($PROGNAME, '$Revision: 1.0 $ ');
      exit $ERRORS{'OK'};
    }
    if ($opt_h) {
      print_help();
      exit $ERRORS{'OK'};
    }
    unless (defined $opt_t) {
      $opt_t = $utils::TIMEOUT; # default timeout
    }
    unless (defined $opt_w && defined $opt_c) {
      print_usage();
      exit $ERRORS{'UNKNOWN'};
    }
    if ($opt_w >= $opt_c) {
      print("Warning (-w) cannot be greater or equal than critical (- 
c)!\n");
      exit $ERRORS{'UNKNOWN'};
    }
    if (defined $opt_w && !defined $opt_c) {
      print("Need critical(-c) when warning(-w) is set.\n");
      exit $ERRORS{'UNKNOWN'};
    } elsif(!defined $opt_w && defined $opt_c) {
      print("Need warning(-w) when critical(-c) is set.\n");
      exit $ERRORS{'UNKNOWN'};
    }

    return $ERRORS{'OK'};
}

sub print_usage() {
    print "Usage: $PROGNAME -w <warn> -c <crit> [-u loginname|uid] [-C  
command name] [-t <timeout>] [-v verbose]\n";
}

sub print_help() {
    print_revision($PROGNAME,'$Revision: 1.0 $');
    print "Copyright (c)2007 Benjamin Hackl\n";
    print "  Checks the established network connection a specific user  
and/or a specific command\n";
    print "  has open(ed).\n\n";
    print "-w (--warning)  Generates a warning if connections are  
above this value.\n";
    print "-c (--critical) Generates a critical alert if connections  
are above this value.\n";
    print "-u (--user)     Specifies the loginname or uid.\n";
    print "-C (--command)  Specifies the name of the command executed. 
\n";
    print "-t (--timeout)  Plugin timeout in seconds (default:  
$utils::TIMEOUT)\n";
    print "-h (--help)     This screen.\n";
    print "-V (--version)  Plugin Version.\n";
    print "\n\n";
    print "Note: -w and -c are required arguments given in numbers.\n";
    print "      either -u or -C is required. -u can be given as a  
loginname or as an uid.\n";
    print "      -C can be given as the full command name or as a part  
of the command.\n";
    print "example:\n";
    print " $PROGNAME -w 100 -c 120 -u apache\n";
    print "Generates a warning if the user apache has more than 100  
established connections\n";
    print "and an error if the established connection count is above  
120.\n";
    print " $PROGNAME -w 100 -c 120 -c httpd\n";
    print "Generates a warning if the process matching the name  
'httpd' has more than 100\n";
    print "established connections and an error if this values is  
above 120.\n\n";
    support();
}

# [EOF]

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