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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",
+ },
+ });
+}
+
+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 $query = "$self->{properties}{binary} \@$host $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;