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#!/usr/bin/perl -w
#
# Copyright (c) 2004 Oliver Eikemeier. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# 1. Redistributions of source code must retain the above copyright notice
# this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# 3. Neither the name of the author nor the names of its contributors may be
# used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# $FreeBSD$
#
# MAINTAINER= eik@FreeBSD.org
#
require 5.005;
use strict;
my $dbdir = $ENV{RANKDIR} ? $ENV{RANKDIR} : '/var/db/distrank';
my $fping = $ENV{FPING} ? $ENV{FPING} : '/usr/local/sbin/fping';
-x $fping
or die "fping required\n";
-d $dbdir || mkdir $dbdir, 0777
or die "Can't create $dbdir\n";
my $rankfile = "$dbdir/ranks-fping";
my $now = time;
my %distance;
if (-r $rankfile) {
open RANKS, "<$rankfile";
while (<RANKS>) {
chomp;
my ($host, $d, $e) = split;
$distance{$host} = [$d, $e]
if defined $e && $e >= $now;
}
close RANKS;
}
my %mastersites;
my %newdistance;
my $distgood = 0;
my $distdefault = 5000;
my $distbad = 10000;
my $expgood = $now + 14 * 86400;
my $expdefault = $now + 7 * 86400;
my $hostcount = 0;
while (<>) {
chomp;
next
if exists $mastersites{$_};
if (m'^(?:ftp|https?)://(?:[^/]*@)?([^/:]+\.[^/:]+)(?::\d+)?(?:/|$)'i) {
my $host = lc $1;
$mastersites{$_} = $host;
if (!defined $distance{$host}) {
$distance{$host} = [$distdefault, $expdefault];
$newdistance{$host} = undef
}
$hostcount++;
} elsif (m'^file:'i) {
$mastersites{$_} = 'FILE';
} else {
$mastersites{$_} = 'UNKNOWN';
}
}
if (%newdistance && $hostcount > 1) {
if (!open FPING, '-|') {
if (!open FPINGIN, '|-') {
open STDERR, '>&STDOUT';
exec $fping, '-q', '-C', '3';
die
}
foreach (keys %newdistance) {
print FPINGIN $_, "\n";
}
close FPINGIN;
exit;
}
while(<FPING>) {
/([^\s:]+)\s*:\s*([\s\d.-]*)/ or next;
my $sum = 0.0;
my $num = 0;
foreach my $val (split ' ', $2) {
$val ne '-' || next;
$sum += $val;
$num++;
}
if ($num > 0) {
$distance{$1} = [$sum/$num, $expgood];
}
}
close FPING;
open RANKS, ">$rankfile";
while (my ($host, $val) = each %distance) {
printf RANKS "%s\t%.2f\t%d\n", $host, $val->[0], $val->[1]
if defined $val;
}
close RANKS;
}
$distance{FILE} = [$distgood, 0];
$distance{UNKNOWN} = [$distbad, 0];
foreach (sort {$distance{$mastersites{$a}}->[0] <=> $distance{$mastersites{$b}}->[0]} keys %mastersites) {
print $_, "\n";
}
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