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Annotation of embedaddon/ntp/scripts/ntptrace.in, revision 1.1.1.1

1.1       misho       1: #! @PATH_PERL@ -w
                      2: 
                      3: # John Hay -- John.Hay@icomtek.csir.co.za / jhay@FreeBSD.org
                      4: 
                      5: use Socket;
                      6: use Getopt::Std;
                      7: use vars qw($opt_n $opt_m);
                      8: 
                      9: $ntpq = "ntpq";
                     10: 
                     11: $Getopt::Std::STANDARD_HELP_VERSION=1;
                     12: getopts('nm:');
                     13: 
                     14: $dodns = 1;
                     15: $dodns = 0 if (defined($opt_n));
                     16: 
                     17: $max_hosts = (defined($opt_m) ? $opt_m :  99);
                     18: $max_hosts = 0 if ( $max_hosts !~ /^\d+$/ );
                     19: $nb_host = 1;
                     20: 
                     21: $host = shift;
                     22: $host ||= "127.0.0.1";
                     23: 
                     24: for (;;) {
                     25:        $nb_host++;
                     26:        $rootdelay = 0;
                     27:        $rootdispersion = 0;
                     28:        $stratum = 255;
                     29:        $cmd = "$ntpq -n -c rv $host";
                     30:        open(PH, $cmd . "|") || die "failed to start command $cmd: $!";
                     31:        while (<PH>) {
                     32:                $stratum = $1 if (/stratum=(\d+)/);
                     33:                $peer = $1 if (/peer=(\d+)/);
                     34:                # Very old servers report phase and not offset.
                     35:                $offset = $1 if (/(?:offset|phase)=([^\s,]+)/);
                     36:                $rootdelay = $1 if (/rootdelay=([^\s,]+)/);
                     37:                $rootdispersion = $1 if (/rootdispersion=([^\s,]+)/);
                     38:                $refid = $1 if (/refid=([^\s,]+)/);
                     39:        }
                     40:        close(PH) || die "$cmd failed";
                     41:        last if ($stratum == 255);
                     42:        $offset /= 1000;
                     43:        $syncdistance = ($rootdispersion + ($rootdelay / 2)) / 1000;
                     44:        $dhost = $host;
                     45:        # Only do lookups of IPv4 addresses. The standard lookup functions
                     46:        # of perl only do IPv4 and I don't know if we should require extras.
                     47:        if ($dodns && $host =~ /^(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$/) {
                     48:                $iaddr = inet_aton($host);
                     49:                $name = (gethostbyaddr($iaddr, AF_INET))[0];
                     50:                $dhost = $name if (defined($name));
                     51:        }
                     52:        printf("%s: stratum %d, offset %f, synch distance %f",
                     53:            $dhost, $stratum, $offset, $syncdistance);
                     54:        printf(", refid '%s'", $refid) if ($stratum == 1);
                     55:        printf("\n");
                     56:        last if ($stratum == 0 || $stratum == 1 || $stratum == 16);
                     57:        last if ($refid =~ /^127\.127\.\d{1,3}\.\d{1,3}$/);
                     58:        last if ($nb_host > $max_hosts);
                     59: 
                     60:        $cmd = "$ntpq -n -c \"pstat $peer\" $host";
                     61:        open(PH, $cmd . "|") || die "failed to start command $cmd: $!";
                     62:        $thost = "";
                     63:        while (<PH>) {
                     64:                $thost = $1, last if (/srcadr=(\S+),/);
                     65:        }
                     66:        close(PH) || die "$cmd failed";
                     67:        last if ($thost eq "");
                     68:        last if ($thost =~ /^127\.127\.\d{1,3}\.\d{1,3}$/);
                     69:        $host = $thost;
                     70: }
                     71: