73 lines
2.3 KiB
Perl
73 lines
2.3 KiB
Perl
#!/usr/bin/env perl
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#
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# danielbowling424@msn.com
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# http://swagg.cc
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#
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# Copyright 2019 Daniel Bowling, Mount Rainier, Maryland, USA
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# All rights reserved.
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#
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# Redistribution and use of this script, with or without modification, is
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# permitted provided that the following conditions are met:
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#
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# 1. Redistributions of this script must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
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# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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# EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# - current time of day in 64-bit NTP format (da_time)
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# - obtain eui64
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# - cat first with second
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# - compute SHA-1 of third and use least significant 40 bits
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use strict;
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use warnings;
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use DateTime;
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use Digest::SHA qw(sha1_hex);
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if ("$#ARGV" == "-1") {
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print "USAGE: $0 <MAC ADDRESS>\n";
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exit 64;
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}
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# current time of day
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my $time = time();
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my $offset = 2208988800;
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my $epoch = $time + $offset;
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# eui64
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my $mac = "$ARGV[0]";
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$mac =~ tr/A-F/a-f/;
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my @fields = split /:/, $mac;
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my $halfone = "$fields[0]" . "$fields[1]" . "$fields[2]" . "ff";
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my $halftwo = "fe" . "$fields[3]" . "$fields[4]" . "$fields[5]";
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my $binfield = sprintf("%b", hex("$fields[0]"));
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my $decfield = sprintf("%d", hex("$fields[0]"));
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if ($binfield =~ m/1[01]$/) {
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$decfield = $decfield - 2;
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} else {
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$decfield = $decfield + 2;
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}
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$binfield = sprintf("%b", int("$decfield"));
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my $hexfield = sprintf("%x", int("$decfield"));
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$halfone = "$hexfield" . "$fields[1]" . "$fields[2]" . "ff";
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my $fulleui = "$halfone" . "$halftwo";
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# cat time
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my $zeroes = ":/48";
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my $digesty = sha1_hex("$epoch" . "$fulleui");
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my $uniqueid = "fd" . substr("$digesty", -10);
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$uniqueid =~ s/(.{1,4})/$1:/gs;
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print "$uniqueid" . "$zeroes\n";
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