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@chitoku-k
Last active April 29, 2018 03:46
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MAP-E のアドレス変換器(PHP >= 7.1.0)
<?php
// https://qiita.com/mpyw/items/0fdffd3c70b3abd802f5
function array_group_by_range(array $array, $separator = '-')
{
sort($array, SORT_NUMERIC);
$pairs = $ranges = [];
foreach (array_values(array_unique($array, SORT_NUMERIC)) as $i => $v) {
$pairs[$v - $i][isset($pairs[$v - $i])] = $v;
}
foreach ($pairs as $pair) {
$ranges[] = implode($separator, $pair);
}
return $ranges;
}
// MAP-E IPv4
function calculate_mapped_ipv4(string $ipv6)
{
static $address_map = [
'240b:10' => '106.72',
'240b:12' => '14.8',
'240b:250' => '14.10',
'240b:252' => '14.12',
];
preg_match('/^(240b:[a-f0-9]{1,4}):([a-f0-9]{2})([a-f0-9]{2})/', $ipv6, $matches);
[ , $key, $high_1, $high_2 ] = $matches;
return sprintf('%s.%s.%s', $address_map[$key], intval($high_1, 16), intval($high_2, 16));
}
// CE IPv6
function calculate_ce_ipv6(string $ipv6)
{
preg_match('/^(240b:[a-f0-9]{1,4}):([a-f0-9]{1,4}):([a-f0-9]{1,4})/', $ipv6, $matches);
[ , $key, $high, $low ] = $matches;
$ipv4 = sprintf('%x:%x%02x:%02x', ...array_map('intval', explode('.', calculate_mapped_ipv4($ipv6))));
return sprintf('%s:%s:%s:%s00:%s', $key, $high, $low, $ipv4, $low);
}
// MAP-E Ports
function calculate_mapped_ports(string $ipv6)
{
preg_match('/^240b:[a-f0-9]{1,4}:([a-f0-9]{2})/', $ipv6, $matches);
[ , $psid ] = $matches;
return array_merge(...array_map(function ($port) use ($psid) {
[ $high, $low ] = str_split(sprintf('%02x', $port));
return [
sprintf('%02x', $port) => intval(sprintf('%s%s%s', $high, $psid, $low), 16),
];
}, range(0x10, 0xff)));
}
echo 'IPv6: ';
$ipv6 = strtolower(rtrim(fgets(STDIN)));
echo "\n";
echo "Mapped IPv4:\n " . calculate_mapped_ipv4($ipv6) . "\n";
echo "CE IPv6:\n " . calculate_ce_ipv6($ipv6) . "\n";
echo "Mapped ports:\n " . implode("\n ", array_group_by_range(calculate_mapped_ports($ipv6))) . "\n";
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