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package Smokeping::probes::DNS;
=head1 301 Moved Permanently
This is a Smokeping probe module. Please use the command
C<smokeping -man Smokeping::probes::DNS>
to view the documentation or the command
C<smokeping -makepod Smokeping::probes::DNS>
to generate the POD document.
=cut
use strict;
use base qw(Smokeping::probes::basefork);
use IPC::Open3;
use Symbol;
use Carp;
sub pod_hash {
return {
name => <<DOC,
Smokeping::probes::DNS - Name Service Probe for SmokePing
DOC
description => <<DOC,
Integrates dig as a probe into smokeping. The variable B<binary> must
point to your copy of the dig program. If it is not installed on
your system yet, you should install bind-utils >= 9.0.0.
The Probe asks the given host n-times for it's name. Where n is
the amount specified in the config File.
DOC
authors => <<'DOC',
Igor Petrovski <pigor@myrealbox.com>,
Carl Elkins <carl@celkins.org.uk>,
Andre Stolze <stolze@uni-muenster.de>,
Niko Tyni <ntyni@iki.fi>,
Chris Poetzel<cpoetzel@anl.gov>
DOC
};
}
my $dig_re=qr/query time:\s+([0-9.]+)\smsec.*/i;
sub new($$$)
{
my $proto = shift;
my $class = ref($proto) || $proto;
my $self = $class->SUPER::new(@_);
# no need for this if we run as a cgi
unless ( $ENV{SERVER_SOFTWARE} ) {
my $call = "$self->{properties}{binary} localhost";
my $return = `$call 2>&1`;
if ($return =~ m/$dig_re/s){
$self->{pingfactor} = 1000;
print "### parsing dig output...OK\n";
} else {
croak "ERROR: output of '$call' does not match $dig_re\n";
}
};
return $self;
}
sub probevars {
my $class = shift;
return $class->_makevars($class->SUPER::probevars, {
_mandatory => [ 'binary' ],
binary => {
_doc => "The location of your dig binary.",
_example => '/usr/bin/dig',
_sub => sub {
my $val = shift;
return "ERROR: DNS 'binary' does not point to an executable"
unless -f $val and -x _;
return undef;
},
},
});
}
sub targetvars {
my $class = shift;
return $class->_makevars($class->SUPER::targetvars, {
lookup => { _doc => "Name of the host to look up in the dns.",
_example => "www.example.org",
},
server => { _doc => "Name of the dns server to use.",
_example => "ns1.someisp.net",
},
});
}
sub ProbeDesc($){
my $self = shift;
return "DNS requests";
}
sub pingone ($){
my $self = shift;
my $target = shift;
my $inh = gensym;
my $outh = gensym;
my $errh = gensym;
my $host = $target->{addr};
my $lookuphost = $target->{vars}{lookup};
$lookuphost = $target->{addr} unless defined $lookuphost;
my $dnsserver = $target->{vars}{server} || $host;
my $query = "$self->{properties}{binary} \@$dnsserver $lookuphost";
my @times;
$self->do_debug("query=$query\n");
for (my $run = 0; $run < $self->pings($target); $run++) {
my $pid = open3($inh,$outh,$errh, $query);
while (<$outh>) {
if (/$dig_re/i) {
push @times, $1;
last;
}
}
waitpid $pid,0;
close $errh;
close $inh;
close $outh;
}
@times = map {sprintf "%.10e", $_ / $self->{pingfactor}} sort {$a <=> $b} grep {$_ ne "-"} @times;
# $self->do_debug("time=@times\n");
return @times;
}
1;
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