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#!/usr/bin/perl -w
#
# Convert valid IPv6 address to ip6.int PTR value. Convert valid
# IPv4 address to in-addr.arpa PTR value. Anything not valid is
# simply printed as is. Handles :: notation and embedded IPv4
# addresses. If the address is followed by /n, the PTR is
# truncated to n bits.
#
# Examples:
# nslookup -type=any `ip6_int 3ffe::203.34.97.6` looks up
# 6.0.1.6.2.2.b.c.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.e.f.f.3.ip6.int
# nslookup -type=any `ip6_int fe80::b432:e6ff/10` looks up
# 2.e.f.ip6.int
# nslookup -type=any `ip6_int ::127.0.0.1` looks up
# 1.0.0.0.0.0.f.7.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.int
# nslookup -type=any `ip6_int 127.0.0.1` looks up
# 1.0.0.127.in-addr.arpa
# nslookup -type=any `ip6_int 127.0.0.1/8` looks up
# 127.in-addr.arpa
#
# Copyright 1997 Keith Owens <kaos@ocs.com.au>. GPL.
#
require 5;
use strict;
use integer;
my $v6;
if ($#ARGV >= 0 &&
($v6 = ($ARGV[0] =~ m;^([0-9a-fA-f:]+)(?::(\d+\.\d+\.\d+\.\d+))?(?:/(\d+))?$;))
|| $ARGV[0] =~ m;^(\d+\.\d+\.\d+\.\d+)(?:/(\d+))?$;) {
my $valid = 1;
if ($v6) {
my (@chunk) = split(/:/, $1, 99);
my $mask = $3;
if ($2) {
my (@v4) = split(/\./, $2);
$valid = ($v4[0] <= 255 && $v4[1] <= 255 &&
$v4[2] <= 255 && $v4[3] <= 255);
if ($valid) {
push(@chunk, sprintf("%x%02x", $v4[0], $v4[1]));
push(@chunk, sprintf("%x%02x", $v4[2], $v4[3]));
}
}
my $pattern = "";
if ($valid) {
foreach (@chunk) {
$pattern .= /^$/ ? 'b' : 'c';
}
if ($pattern =~ /^bbc+$/) {
@chunk = (0, 0, @chunk[2..$#chunk]);
@chunk = (0, @chunk) while ($#chunk < 7);
}
elsif ($pattern =~ /^c+bb$/) {
@chunk = (@chunk[0..$#chunk-2], 0, 0);
push(@chunk, 0) while ($#chunk < 7);
}
elsif ($pattern =~ /^c+bc+$/) {
my @left;
push(@left, shift(@chunk)) while ($chunk[0] ne "");
shift(@chunk);
push(@left, 0);
push(@left, 0) while (($#left + $#chunk) < 6);
@chunk = (@left, @chunk);
}
$valid = $#chunk == 7;
}
my $ip6int = "ip6.int";
my $i;
if ($valid) {
foreach (@chunk) {
$i = hex($_);
if ($i > 65535) {
$valid = 0;
}
else {
$ip6int = sprintf("%x.%x.%x.%x.",
($i) & 0xf,
($i >> 4) & 0xf,
($i >> 8) & 0xf,
($i >> 12) & 0xf)
. $ip6int;
}
}
}
if ($valid && defined($mask)) {
$valid = ($mask =~ /^\d+$/ && $mask <= 128);
if ($valid) {
$ip6int = substr($ip6int, int((128-$mask)/4)*2);
if ($mask &= 3) {
$i = hex(substr($ip6int, 0, 1));
$i >>= (4-$mask);
substr($ip6int, 0, 1) = sprintf("%x", $i);
}
}
}
$ARGV[0] = $ip6int if ($valid);
}
else {
# v4
my (@v4) = split(/\./, $1);
my $mask = $2;
$valid = ($v4[0] <= 255 && $v4[1] <= 255 &&
$v4[2] <= 255 && $v4[3] <= 255);
my $v4 = hex(sprintf("%02X%02X%02X%02X", @v4));
if ($valid && defined($mask)) {
$valid = ($mask =~ /^\d+$/ && $mask <= 32);
if ($valid) {
$v4 = $v4 & ((~0) << (32-$mask));
$v4[0] = ($v4 >> 24) & 255;
$v4[1] = ($v4 >> 16) & 255;
$v4[2] = ($v4 >> 8) & 255;
$v4[3] = $v4 & 255;
}
}
else {
$mask = 32;
}
if ($valid) {
my $i = 4 - int(($mask+7) / 8);
pop(@v4) while ($i--);
$ARGV[0] = join('.', reverse(@v4));
$ARGV[0] .= '.' if ($ARGV[0] ne "");
$ARGV[0] .= 'in-addr.arpa';
}
}
}
print "@ARGV\n";
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