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#!/usr/bin/perl
# author: Al Tobey <albert.tobey@priority-health.com>
# what: monitor a process using the host-resources mib
# license: GPL - http://www.fsf.org/licenses/gpl.txt
#
# Todo:
# * implement memory and cpu utilization checks
# * maybe cache pids in DBM files if snmp agents get overworked
###############################################################################
# to get a list of processes over snmp try this command:
# snmptable -v2c -c public hostname hrSWRunTable
# for just a list of valid arguments for the '-e' option:
# snmpwalk -v2c -c public hostname hrSWRunName |perl -pe 's:.*/::'
###############################################################################
use strict;
require 5.6.0;
use lib qw( /opt/nagios/libexec /usr/local/libexec );
use utils qw(%ERRORS $TIMEOUT &print_revision &support &usage);
use SNMP 5.0;
use Getopt::Long;
use Storable;
use vars qw( $exit $opt_version $opt_timeout $opt_help $opt_command $opt_host $opt_community $opt_verbose $opt_warning $opt_critical $opt_memory $opt_cpu $opt_port $opt_regex $opt_stats $opt_cache $opt_nocache $cache_exp $interpreters $snmp_session $PROGNAME $TIMEOUT );
$PROGNAME = "snmp_process_monitor.pl";
$opt_verbose = undef;
$opt_host = undef;
$opt_community = 'public';
$opt_command = undef;
$opt_warning = [ 1, -1 ];
$opt_critical = [ 1, -1 ];
$opt_memory = undef;
$opt_cpu = undef;
$opt_port = 161;
$opt_cache = 1;
$opt_nocache = undef;
$cache_exp = 600;
$exit = $ERRORS{OK};
$interpreters = '(perl|/bin/sh|/usr/bin/sh|/bin/bash|/bin/ksh|python)';
our $cachefile = '/var/opt/nagios/tmp/'; # completed later
our %processes = ();
sub process_options {
my( $opt_crit, $opt_warn ) = ();
Getopt::Long::Configure( 'bundling' );
GetOptions(
'V' => \$opt_version, 'version' => \$opt_version,
'v' => \$opt_verbose, 'verbose' => \$opt_verbose,
'h' => \$opt_help, 'help' => \$opt_help,
's' => \$opt_stats, 'statistics' => \$opt_stats,
'nocache' => \$opt_nocache,
'H:s' => \$opt_host, 'hostname:s' => \$opt_host,
'p:i' => \$opt_port, 'port:i' => \$opt_port,
'C:s' => \$opt_community, 'community:s' => \$opt_community,
'c:s' => \$opt_crit, 'critical:s' => \$opt_crit,
'w:s' => \$opt_warn, 'warning:s' => \$opt_warn,
't:i' => \$TIMEOUT, 'timeout:i' => \$TIMEOUT,
'e:s' => \$opt_command, 'command:s' => \$opt_command,
'r:s' => \$opt_regex, 'regex:s' => \$opt_regex,
'cpu:i' => \$opt_cpu, 'memory:i' => \$opt_memory,
);
if ( defined($opt_version) ) { local_print_revision(); }
if ( defined($opt_verbose) ) { $SNMP::debugging = 1; }
if ( !defined($opt_host) || defined($opt_help) || (!defined($opt_command) && !defined($opt_regex)) ) {
print_help();
exit $ERRORS{UNKNOWN};
}
if ( defined($opt_crit) ) {
if ( $opt_crit =~ /,/ ) {
$opt_critical = [ split(',', $opt_crit) ];
}
else {
$opt_critical = [ $opt_crit, -1 ];
}
}
if ( defined($opt_warn) ) {
if ( $opt_warn =~ /,/ ) {
$opt_warning = [ split(',', $opt_warn) ];
}
else {
$opt_warning = [ $opt_crit, -1 ];
}
}
if ( defined($opt_memory) ) { $opt_memory = 0 }
if ( defined($opt_cpu) ) { $opt_cpu = 0 }
if ( defined($opt_nocache)) { $opt_cache = 0 }
# complete the cachefile's name
$cachefile .= $opt_host . '.proc';
}
sub local_print_revision {
print_revision( $PROGNAME, '$Revision: 84 $ ' )
}
sub print_usage {
print "Usage: $PROGNAME -H <host> -C <snmp_community> -e <command> [-w <low>,<high>] [-c <low>,<high>] [-t <timeout>] [-s|--statistics] [--memory] [--cpu] [--nocache]\n";
}
sub print_help {
local_print_revision();
print "Copyright (c) 2002 Al Tobey <albert.tobey\@priority-health.com>\n\n",
"SNMP Process Monitor plugin for Nagios\n\n";
print_usage();
print <<EOT;
-v, --verbose
print extra debugging information
-h, --help
print this help message
-H, --hostname=HOST
name or IP address of host to check
-C, --community=COMMUNITY NAME
community name for the host's SNMP agent
-e, --command=COMMAND NAME (ps -e style)
what command should be monitored?
-r, --regex=Perl RE
use a perl regular expression to find your process
-w, --warning=INTEGER[,INTEGER]
minimum and maximum number of processes before a warning is issued (Default 1,-1)
-c, --critical=INTEGER[,INTEGER]
minimum and maximum number of processes before a critical is issued (Default 1,-1)
--memory
combined with '-s', will print the number of bytes of real memory used by process
--cpu
combined with '-s', will print the number of seconds of cpu time consumed by process
EOT
}
sub verbose (@) {
return if ( !defined($opt_verbose) );
print @_;
}
sub check_for_errors {
if ( $snmp_session->{ErrorNum} ) {
%processes = ();
print "UNKNOWN - error retrieving SNMP data: $snmp_session->{ErrorStr}\n";
exit $ERRORS{UNKNOWN};
}
}
sub init_cache {
if ( !defined($opt_cache) ) {
%processes = ();
return;
}
if ( -r $cachefile ) {
eval {
verbose "loading cache from $cachefile\n";
%processes = %{ retrieve( $cachefile ) };
};
if ( $@ ) {
verbose "cache loading failed - using blank cache: $@\n";
%processes = ()
}
}
else {
%processes = ();
}
}
sub snmpget {
my $tmpvar = SNMP::Varbind->new( shift );
$snmp_session->get( $tmpvar );
check_for_errors();
return $tmpvar->val;
}
sub update_cache {
# expire the cache after $cache_exp seconds
if ( $opt_cache != 0 && exists($processes{__last_update})
&& $processes{__last_update} >= time - $cache_exp ) {
verbose "cache file is recent enough - using it\n";
return 1;
}
verbose "retrieving full listing of processes from $opt_host\n";
my $process_count = snmpget( ['hrSystemProcesses', 0] );
# retrieve the data from the remote host
my ($names) = $snmp_session->bulkwalk( 0, $process_count + 1, [['hrSWRunName']] );
check_for_errors();
# make sure the number of processes from the bulkwalk is close to hrSystemProcesses
if ( scalar(@$names) + 10 < $process_count ) {
print "UNKNOWN - only ", scalar(@$names), " of ",$process_count, " processes returned\n";;
exit $ERRORS{UNKNOWN};
}
# sort through the process names and create a nice hash of processes
foreach my $row ( @$names ) {
my %hash = {};
$hash{name} = $row->val;
$hash{abs_name} = $row->val;
$hash{name} =~ s#.*/##; # strip path
if ( defined($opt_regex) ||
($row->val =~ m#$interpreters$#
&& $opt_command !~ m#$interpreters$#) ) {
# fetch the runtime parameters of the process
my $parameters = snmpget( ['hrSWRunParameters', $row->iid] );
# only strip if we're looking for a specific command
if ( defined($opt_command) ) {
verbose "process ",$row->iid," uses $1 as an interpreter - getting parameters\n";
$hash{name} = $parameters;
$hash{name} =~ s#.*/##; # strip path name off the front
$hash{name} =~ s/\s+.*$//; # strip everything from the first space to the end
}
else {
# use the full 'ps -efl' style listing for regular expression matching
my $path = snmpget( ['hrSWRunPath', $row->iid] );
$hash{name} = "$path $parameters";
}
}
# store in the global hash
$processes{$row->iid} = \%hash;
}
# update the timestamp so the cache can expire
$processes{__last_update} = time;
return 0;
}
# process the %processes hash and see if there any matches for our command or regex
sub check_for_matches {
my $ret_match = 0;
foreach my $key ( keys(%processes) ) {
next if ( $key eq '__last_update' );
my $match = 0;
# static matches are letter-for-letter (-e)
if ( defined($opt_command) && $processes{$key}->{name} eq $opt_command ) { $match++; }
# use /o to make sure the user-supplied regex (-r) is only compiled once
elsif ( defined($opt_regex) && $processes{$key}->{name} =~ /$opt_regex/o ) { $match++; }
# verify the cache's entry by doing an snmpget
if ( $match > 0 && $opt_cache != 0 ) {
my $proc = snmpget( ['hrSWRunName', $key] );
--$match if ( !$proc || $proc ne $processes{$key}->{abs_name} );
}
# get the process memory usage if requested
if ( $match > 0 && defined($opt_memory) ) {
$opt_memory += snmpget( ['hrSWRunPerfMem', $key] );
}
# get the process cpu usage if requested
if ( $match > 0 && defined($opt_cpu) ) {
$opt_cpu += snmpget( ['hrSWRunPerfCPU', $key] );
}
verbose "process '$processes{$key}->{name}' has pid $processes{$key}->{pid} and index $key\n"
if ( $match > 0 );
$ret_match += $match;
}
return $ret_match;
}
# =========================================================================== #
# =====> MAIN
# =========================================================================== #
process_options();
alarm( $TIMEOUT ); # make sure we don't hang Nagios
# intialize the cache, if it's enabled
init_cache();
# create a session for conversing with the remote SNMP agent
$snmp_session = new SNMP::Session(
DestHost => $opt_host,
Community => $opt_community,
RemotePort => $opt_port,
Version => '2c'
);
my $usage = update_cache();
my $count = check_for_matches();
# always try twice if caching is enabled - once with cache and once without
if ( $usage != 0 && $opt_cache != 0 && $count <= 0 ) {
verbose "did not find process in cache - trying a refresh\n";
%processes = ();
update_cache();
$count = check_for_matches();
}
# the default, OK message
my $message = "OK - $count process(es) found resembling '". ($opt_command || $opt_regex);
# warning, critical
if ( ($opt_warning->[0] > 0 && $opt_warning->[0] > $count)
|| ($opt_warning->[1] > 0 && $opt_warning->[1] <= $count) ) {
$message = "WARNING - no processes found resembling '". ($opt_command || $opt_regex);
$exit = $ERRORS{WARNING};
}
if ( ($opt_critical->[0] > 0 && $opt_critical->[0] > $count)
|| ($opt_critical->[1] > 0 && $opt_critical->[1] <= $count) ) {
$message = "CRITICAL - no processes found resembling '". ($opt_command || $opt_regex);
$exit = $ERRORS{CRITICAL};
}
# output the status message
print $message, "'";
# print the number of processes if statistics are requested
if ( defined($opt_stats) ) {
print "|count=$count";
if ( defined($opt_memory) ) {
print ":memory=", $opt_memory;
}
if ( defined($opt_cpu) ) {
$opt_cpu = $opt_cpu / 100;
printf ":cpu=%.2f", $opt_cpu;
}
}
# store a copy of the %processes hash if we're using caching
if ( $exit == $ERRORS{OK} && $opt_cache != 0 ) {
eval {
unlink( $cachefile ) if ( -e $cachefile );
store( \%processes, $cachefile );
};
}
print "\n";
exit $exit;