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