#
# check_jmxproxy
#
# Contacts a JMX proxy (like that which Apache Tomcat provides)
# and compares the return value to the warning and critical values
# provided as parameters to this script.
#
# Copyright (c) 2012 Christopher Schultz
#
# Christopher Schultz licenses this file to You under the Apache License,
# Version 2.0 (the "License"); you may not use this file except in
# compliance with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Special thanks to Susan Burgee for her help with Perl.
#
use strict;
# For getopt:
use Getopt::Long qw(:config no_ignore_case bundling);;
# For HTTP stuff:
use LWP::UserAgent;
use HTTP::Request;
use HTTP::Response;
use URI::Heuristic;
my $help = '';
my $url = '';
my $warn = '';
my $critical = '';
my $verbose = '';
my $authorization = '';
my $useragent = 'Nagios check_jmxproxy/0.1';
my $timeout = 180;
my $fetchingRegexp = '^OK.*=\s*([0-9]+)$';
# $fetchingRegexp = 'OK.*used=([0-9]+).*';
my $outputFilterRegexp;
GetOptions(
'U=s' => \$url,
'url=s' => \$url,
'w=s' => \$warn,
'warn=s' => \$warn,
'c=s' => \$critical,
'critical=s' => \$critical,
'h' => \$help,
'help' => \$help,
'v' => \$verbose,
'verbose' => \$verbose,
'a=s' => \$authorization,
'authorization=s' => \$authorization,
'A' => \$useragent,
'useragent' => \$useragent,
't=i' => \$timeout,
'timeout=i' => \$timeout,
'r=s' => \$fetchingRegexp,
'regexp=s' => \$fetchingRegexp,
'R=s' => \$outputFilterRegexp,
'filtering-regexp=s' => \$outputFilterRegexp,
) or $help = '-h';
$help = 1 if ( $url eq '' || $warn eq '' || $critical eq '' );
if( $help ) {
print <<USAGE;
Usage: $0 [-v] [-a auth] [-A agent] -U <url> -w <warn> -c <critical>
-A, --useragent
Specify the User-Agent that will be sent when contacting the server.
-a, --authorization
Specify the BASIC authorization string that will be used to satisfy
a WWW-Authenticate challenge. Should be in the form 'user:password'.
-c, --critical
Specifies the 'critical' level against which the number returned
from the JMX proxy will be compared. Append a ':' to the end of
the critical value in order to perform a less-than comparison.
-h, --help
Shows this help message.
-r, --regexp
Specifies the regular expression that will be used to capture the
numeric portion of the JMX proxy's response. The first capture group
in the regular expression will be used as the numeric response.
Default: '^OK.*=\\s*([0-9]+)\$'
-R, --filtering-regexp
Specifies the regular expresison that will be used to filter the
response from the JMX proxy before echoing it to the output stream
after a "JMX OK", "JMX WARN", or "JMX CRITICAL" message. If the
response from the JMX proxy is malformed, the response will not be
filtered.
-t, --timeout
Specifies the timeout, in seconds, to wait for a response before
the request to the server is considered a failure. Default is 180
(3 minutes).
-U, --url
Specifies the URL that check_jmxproxy will contact.
-v, --verbose
Enabled verbose logging of what check_jmxproxy is doing.
-w, --warn
Specifies the 'warning' level against which a number returned
from the JMX proxy will be compared. Append a ':' to the end of
the warning value in order to perform a less-than comparison.
Example:
${0} -U 'http://host/manager/jmxproxy?get=java.lang:type=Memory&att=HeapMemoryUsage&key=used' -w 33554432 -c 50331648
This example will report CRITICAL if the current JVM heap size exceeds
48MiB or WARN if the heap size exceeds 32MiB.
USAGE
exit();
}
if ($verbose) {
print "url = $url\n" if ($url);
print "cricital = $critical\n" if ($critical);
print "warn = $warn\n" if ($warn);
}
my $full_url = URI::Heuristic::uf_urlstr($url);
my $ua = LWP::UserAgent->new();
$ua->agent($useragent);
my $req = HTTP::Request->new(GET => $url);
# Set the authentication information if necessary
if (!($authorization eq '')) {
$req->authorization_basic(split /:/, $authorization, 2);
}
$ua->timeout($timeout);
my $response = $ua->request($req);
if ($response->is_error()) {
printf "JMX CRITICAL: Response: %s\n", $response->status_line;
exit 2;
} else {
my $content = $response->content();
# Remove any trailing newlines
chomp($content);
if($verbose) {
print "(v) Using fetching regexp '$fetchingRegexp'\n";
}
my($num) = ($content =~ /$fetchingRegexp/);
if($verbose) {
print "(v) Response from JMX proxy: '$content'\n";
print "(v) got number from JMX: $num\n";
}
if($num eq '') {
printf "JMX CRITICAL: Bad Response: %s\n", $content;
exit 2;
} else {
if($outputFilterRegexp) {
print "Filtering JXM proxy response using filter: $outputFilterRegexp" if $verbose;
($content) = $content =~ /$outputFilterRegexp/;
}
if ($critical =~ /:$/) {
printf "(v) checking if %s < %s (critical)\n", $num, $critical if $verbose;
if($num < $critical) {
print "(v) $num < $critical\n" if $verbose;
printf "JMX CRITICAL: %s\n", $content;
exit 2;
} elsif ($warn =~ /:$/) {
printf "(v) checking if %s < %s (warn)\n", $num, $warn if $verbose;
if($num < $warn) {
print "(v) $num < $warn\n" if $verbose;
printf "JMX WARN: %s\n", $content;
exit 1;
} else {
print "(v) $num > $warn\n" if $verbose;
printf "JMX OK: %s\n", $content;
}
} elsif ($num > $warn) {
print "(v) $num > $warn\n" if $verbose;
printf "JMX WARN: %s\n", $content;
exit 1;
} else {
print "(v) $num < $warn\n" if $verbose;
printf "JMX OK: %s\n", $content;
}
} else {
if($num > $critical) {
print "(v) $num > $critical\n" if $verbose;
printf "JMX CRITICAL: %s\n", $content;
exit 2;
} elsif ($warn =~ /:$/) {
if($num < $warn) {
print "(v) $num < $warn\n" if $verbose;
printf "JMX WARN: %s\n", $content;
exit 1;
} else {
print "(v) $num > $warn\n" if $verbose;
printf "JMX OK: %s\n", $content;
}
} elsif ($num > $warn) {
print "(v) $num > $warn\n" if $verbose;
printf "JMX WARN: %s\n", $content;
exit 1;
} else {
print "(v) $num < $warn\n" if $verbose;
printf "JMX OK: %s\n", $content;
}
}
}
}