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| Current File : //scripts/check_unreliable_resolvers |
#!/usr/local/cpanel/3rdparty/bin/perl
# cpanel - scripts/check_unreliable_resolvers Copyright 2022 cPanel, L.L.C.
# All rights reserved.
# copyright@cpanel.net http://cpanel.net
# This code is subject to the cPanel license. Unauthorized copying is prohibited
#
package scripts::check_unreliable_resolvers;
use strict;
use Getopt::Long ();
use Pod::Usage ();
use Cpanel::Resolvers::Check ();
my $ONE_DAY_IN_SECONDS = 86400;
our $NOTIFICATION_INTERVAL = $ONE_DAY_IN_SECONDS;
sub script {
my ( $class, $argv ) = @_;
my %opts = (
notify => 0,
quiet => 0,
);
my $self = bless {}, $class;
my $help;
Getopt::Long::GetOptionsFromArray(
$argv,
help => \$help,
notify => \$opts{'notify'},
quiet => \$opts{'quiet'},
);
if ($help) {
Pod::Usage::pod2usage(
-exitval => 'NOEXIT',
-verbose => 2,
-noperldoc => 1,
);
return 0;
}
$self->{'notify'} = $opts{'notify'};
$self->{'quiet'} = $opts{'quiet'};
my $resolver_state = Cpanel::Resolvers::Check::check_resolvers_performance();
if ( !$resolver_state->{'state'}->is_ok() ) {
$self->send_notification($resolver_state);
return 1;
}
print $self->_locale()->maketext(q{OK}), "\n" unless $self->{'quiet'};
return 0;
}
sub send_notification {
my ( $self, $resolvers_ref ) = @_;
require Cpanel::Locale;
my $old = $self->_locale()->set_context_plain();
require Cpanel::Notify;
my $ic_obj = Cpanel::Notify::notification_class(
'class' => 'Check::Resolvers',
'application' => 'Check::Resolvers',
'status' => $resolvers_ref->{'state'},
'interval' => $NOTIFICATION_INTERVAL,
'constructor_args' => [
'origin' => 'check_unreliable_resolvers',
resolver_state => $resolvers_ref->{'resolver_state'},
overall_state => $resolvers_ref->{'state'},
'skip_send' => 1,
]
);
unless ( $self->{'quiet'} ) {
print $ic_obj->render_template_include_as_text( 'template' => 'subject', 'type' => 'text' ) . "\n\n" . $ic_obj->render_template_include_as_text( 'template' => 'body', 'type' => 'html' ) . "\n";
}
if ( $self->{'notify'} ) {
my %notify_check_args = (
app => 'Check::Resolvers',
status => $resolvers_ref->{'state'},
interval => $NOTIFICATION_INTERVAL,
);
return 0 if Cpanel::Notify::notify_blocked(%notify_check_args);
Cpanel::Notify::update_notification_time_if_interval_reached(%notify_check_args);
$ic_obj->send();
}
$self->_locale()->set_context($old);
return 1;
}
sub _locale {
my ($self) = @_;
require Cpanel::Locale;
return ( $self->{'_locale'} ||= Cpanel::Locale->get_handle() );
}
exit( __PACKAGE__->script( \@ARGV ) ) unless caller;
__END__
=pod
=encoding utf-8
=head1 NAME
check_unreliable_resolvers - Checks for resolvers in /etc/resolv.conf that are not reliable or missing
=head1 SYNOPSIS
check_unreliable_resolvers OPTIONS
Options:
--quiet
Do not display output.
--notify
Send notification to the system administrator.
--help
Print this message.
=head1 DESCRIPTION
This script checks the state of /etc/resolv.conf and can notify when one or more
of the nameservers is responding slowly, not responding, unreliable, or otherwise
problematic.
=cut