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Diffstat (limited to 'lib/Smokeping/probes/DNS.pm')
-rw-r--r-- | lib/Smokeping/probes/DNS.pm | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/lib/Smokeping/probes/DNS.pm b/lib/Smokeping/probes/DNS.pm new file mode 100644 index 0000000..1cb188f --- /dev/null +++ b/lib/Smokeping/probes/DNS.pm @@ -0,0 +1,136 @@ +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; |