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check_json_fork
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check_json_fork/check_json.pl

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#!/usr/bin/env perl
use warnings;
use strict;
use HTTP::Request::Common;
use LWP::UserAgent;
use JSON;
use Nagios::Plugin;
use Data::Dumper;
my $np = Nagios::Plugin->new(
usage => "Usage: %s -u|--url <http://user:pass\@host:port/url> -a|--attributes <attributes> "
. "[ -c|--critical <thresholds> ] [ -w|--warning <thresholds> ] "
. "[ -e|--expect <value> ] "
. "[ -p|--perfvars <fields> ] "
. "[ -o|--outputvars <fields> ] "
. "[ -t|--timeout <timeout> ] "
. "[ -d|--divisor <divisor> ] "
. "[ -m|--metadata <content> ] "
. "[ -T|--contenttype <content-type> ] "
. "[ --ignoressl ] "
. "[ -h|--help ] ",
version => '0.5',
blurb => 'Nagios plugin to check JSON attributes via http(s)',
extra => "\nExample: \n"
. "check_json.pl --url http://192.168.5.10:9332/local_stats --attributes '{shares}->{dead}' "
. "--warning :5 --critical :10 --perfvars '{shares}->{dead},{shares}->{live}' "
. "--outputvars '{status_message}'",
url => 'https://github.com/c-kr/check_json',
plugin => 'check_json',
timeout => 15,
shortname => "Check JSON status API",
);
# add valid command line options and build them into your usage/help documentation.
$np->add_arg(
spec => 'url|u=s',
help => '-u, --url http://user:pass@192.168.5.10:9332/local_stats',
required => 1,
);
$np->add_arg(
spec => 'attributes|a=s',
help => '-a, --attributes {shares}->{dead},{shares}->{uptime}',
required => 1,
);
$np->add_arg(
spec => 'divisor|d=i',
help => '-d, --divisor 1000000',
);
$np->add_arg(
spec => 'warning|w=s',
help => '-w, --warning INTEGER:INTEGER . See '
. 'http://nagiosplug.sourceforge.net/developer-guidelines.html#THRESHOLDFORMAT '
. 'for the threshold format. ',
);
$np->add_arg(
spec => 'critical|c=s',
help => '-c, --critical INTEGER:INTEGER . See '
. 'http://nagiosplug.sourceforge.net/developer-guidelines.html#THRESHOLDFORMAT '
. 'for the threshold format. ',
);
$np->add_arg(
spec => 'expect|e=s',
help => '-e, --expect expected value to see for attribute.',
);
$np->add_arg(
spec => 'perfvars|p=s',
help => "-p, --perfvars eg. '* or {shares}->{dead},{shares}->{live}'\n "
. "CSV list of fields from JSON response to include in perfdata "
);
$np->add_arg(
spec => 'outputvars|o=s',
help => "-o, --outputvars eg. '* or {status_message}'\n "
. "CSV list of fields output in status message, same syntax as perfvars"
);
$np->add_arg(
spec => 'metadata|m=s',
help => "-m|--metadata \'{\"name\":\"value\"}\'\n "
. "RESTful request metadata in JSON format"
);
$np->add_arg(
spec => 'contenttype|T=s',
default => 'application/json',
help => "-T, --contenttype application/json \n "
. "Content-type accepted if different from application/json ",
);
$np->add_arg(
spec => 'ignoressl',
help => "--ignoressl\n Ignore bad ssl certificates",
);
## Parse @ARGV and process standard arguments (e.g. usage, help, version)
$np->getopts;
if ($np->opts->verbose) { (print Dumper ($np))};
## GET URL
my $ua = LWP::UserAgent->new;
$ua->env_proxy;
$ua->agent('check_json/0.5');
$ua->default_header('Accept' => 'application/json');
$ua->protocols_allowed( [ 'http', 'https'] );
$ua->parse_head(0);
$ua->timeout($np->opts->timeout);
if ($np->opts->ignoressl) {
$ua->ssl_opts(verify_hostname => 0, SSL_verify_mode => 0x00);
}
if ($np->opts->verbose) { (print Dumper ($ua))};
my $response;
if ($np->opts->metadata) {
$response = $ua->request(GET $np->opts->url, 'Content-type' => 'application/json', 'Content' => $np->opts->metadata );
} else {
$response = $ua->request(GET $np->opts->url);
}
if ($response->is_success) {
if (!($response->header("content-type") =~ $np->opts->contenttype)) {
$np->nagios_exit(UNKNOWN,"Content type is not JSON: ".$response->header("content-type"));
}
} else {
$np->nagios_exit(CRITICAL, "Connection failed: ".$response->status_line);
}
## Parse JSON
my $json_response = decode_json($response->content);
if ($np->opts->verbose) { (print Dumper ($json_response))};
my @attributes = split(',', $np->opts->attributes);
my @warning = split(',', $np->opts->warning);
my @critical = split(',', $np->opts->critical);
my @divisor = $np->opts->divisor ? split(',',$np->opts->divisor) : () ;
my %attributes = map { $attributes[$_] => { warning => $warning[$_] , critical => $critical[$_], divisor => ($divisor[$_] or 0) } } 0..$#attributes;
my %check_value;
my $check_value;
my $result = -1;
my $resultTmp;
foreach my $attribute (sort keys %attributes){
my $check_value;
my $check_value_str = '$check_value = $json_response->'.$attribute;
if ($np->opts->verbose) { (print Dumper ($check_value_str))};
eval $check_value_str;
if (!defined $check_value) {
$np->nagios_exit(UNKNOWN, "No value received");
}
if ($attributes{$attribute}{'divisor'}) {
$check_value = $check_value/$attributes{$attribute}{'divisor'};
}
if (defined $np->opts->expect && $np->opts->expect ne $check_value) {
$np->nagios_exit(CRITICAL, "Expected value (" . $np->opts->expect . ") not found. Actual: " . $check_value);
}
if ( $check_value eq "true" or $check_value eq "false" ) {
if ( $check_value eq "true") {
$resultTmp = 0;
if ($attributes{$attribute}{'critical'} eq 1 or $attributes{$attribute}{'critical'} eq "true") {
$resultTmp = 2;
}
else
{
if ($attributes{$attribute}{'warning'} eq 1 or $attributes{$attribute}{'warning'} eq "true") {
$resultTmp = 1;
}
}
}
if ( $check_value eq "false") {
$resultTmp = 0;
if ($attributes{$attribute}{'critical'} eq 0 or $attributes{$attribute}{'critical'} eq "false") {
$resultTmp = 2;
}
else
{
if ($attributes{$attribute}{'warning'} eq 0 or $attributes{$attribute}{'warning'} eq "false") {
$resultTmp = 1;
}
}
}
}
else
{
$resultTmp = $np->check_threshold(
check => $check_value,
warning => $attributes{$attribute}{'warning'},
critical => $attributes{$attribute}{'critical'}
);
}
$result = $resultTmp if $result < $resultTmp;
$attributes{$attribute}{'check_value'}=$check_value;
}
my @statusmsg;
# routine to add perfdata from JSON response based on a loop of keys given in perfvals (csv)
if ($np->opts->perfvars) {
foreach my $key ($np->opts->perfvars eq '*' ? map { "{$_}"} sort keys %$json_response : split(',', $np->opts->perfvars)) {
# use last element of key as label
my $label = (split('->', $key))[-1];
# make label ascii compatible
$label =~ s/[^a-zA-Z0-9_-]//g ;
my $perf_value;
$perf_value = $json_response->{$key};
if ($np->opts->verbose) { print Dumper ("JSON key: ".$label.", JSON val: " . $perf_value) };
if ( defined($perf_value) ) {
# add threshold if attribute option matches key
if ($attributes{$key}) {
push(@statusmsg, "$label: $attributes{$key}{'check_value'}");
$np->add_perfdata(
label => lc $label,
value => $attributes{$key}{'check_value'},
threshold => $np->set_thresholds( warning => $attributes{$key}{'warning'}, critical => $attributes{$key}{'critical'}),
);
} else {
push(@statusmsg, "$label: $perf_value");
$np->add_perfdata(
label => lc $label,
value => $perf_value,
);
}
}
}
}
# output some vars in message
if ($np->opts->outputvars) {
foreach my $key ($np->opts->outputvars eq '*' ? map { "{$_}"} sort keys %$json_response : split(',', $np->opts->outputvars)) {
# use last element of key as label
my $label = (split('->', $key))[-1];
# make label ascii compatible
$label =~ s/[^a-zA-Z0-9_-]//g;
my $output_value;
$output_value = $json_response->{$key};
push(@statusmsg, "$label: $output_value");
}
}
$np->nagios_exit(
return_code => $result,
message => join(', ', @statusmsg),
);
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