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107 lines
2.8 KiB
107 lines
2.8 KiB
#!/usr/bin/env perl
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# Copyright 2016 Mikael Nordin <mik@elnord.in>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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# MA 02110-1301, USA.
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use strict;
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use warnings;
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sub count_groups { # See hown many groups we have
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die "Too many arguments for subroutine" if @_ < 1;
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die "Too few arguments for subroutine" if @_ > 1;
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my $address = shift;
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# Make sure we have just enough double colons and count them if it is all right
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my $colon_no = () = $address =~ /::/g;
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die "Invalid ipv6 address" if $colon_no > 1;
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my $no = 1;
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$no += () = $address =~ /:/g;
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return $no;
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}
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# If we have one occurence of :: replace with correct amount of zeros and colons
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sub expand_void {
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die "Too many arguments for subroutine" if @_ < 1;
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die "Too few arguments for subroutine" if @_ > 1;
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my $address = shift;
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my $no_colons = 8 - count_groups($address);
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my $insert = "0000:0000";
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for (my $i = 0; $i < $no_colons - 1; $i++) {
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$insert = $insert . ":0000"
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}
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$address =~ s/::/:$insert:/g;
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return $address;
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}
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# Fix a single group and padd with zeros
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sub fix_group {
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die "Too many arguments for subroutine" if @_ < 1;
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die "Too few arguments for subroutine" if @_ > 1;
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my $group = shift;
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my $len = length($group);
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die "Group has too many digits" if $len > 4;
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while ($len < 4) {
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$group = "0$group";
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$len++;
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}
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# Make sure it is a valid hexnumber
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die "Group is not a hex number" if $group !~ /^[0-9a-fA-F]+$/;
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return $group;
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}
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# Loop all groups and fix them with fix_group
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sub fix_groups {
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die "Too many arguments for subroutine" if @_ < 1;
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die "Too few arguments for subroutine" if @_ > 1;
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my $a = shift;
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my @groups = split(/:/, $a);
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my $address = "";
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foreach my $group (@groups) {
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$group = fix_group($group);
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$address = "$address$group:";
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}
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$address =~ s/:+$//;
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return $address;
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}
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# Now put it together
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# Loop through stdin
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while (<>) {
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chomp; # Remove newline
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my $addr = $_; # Store address
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if (count_groups($addr) != 8) {
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$addr = expand_void($addr);
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}
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$addr = fix_groups($addr);
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# Double check that we have enough groups one last time
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die "Not a valid ipv6 address" if count_groups($addr) != 8;
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# Lower case is preffered for ipv6 adresses
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print lc "$addr\n";
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}
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exit 0;
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