forked from GithubBackups/vichan
41 lines
1.1 KiB
PHP
41 lines
1.1 KiB
PHP
<?php
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namespace Vichan\Data\Driver\Dns;
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/**
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* For the love of god never use this implementation if you can.
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*/
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class LibcDnsDriver implements DnsDriver {
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public function __construct(int $timeout) {
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// Try to impose a very frail timeout https://www.php.net/manual/en/function.gethostbyname.php#118841
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\putenv("RES_OPTIONS=retrans:1 retry:1 timeout:{$timeout} attempts:1");
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}
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/**
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* For the love of god never use this.
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* https://www.php.net/manual/en/function.gethostbynamel.php#119535
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*/
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public function nameToIPs(string $name): ?array {
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// Add a trailing dot to not return the loopback address on failure
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// https://www.php.net/manual/en/function.gethostbynamel.php#119535
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$ret = \gethostbynamel("{$name}.");
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if ($ret === false) {
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return null;
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}
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return $ret;
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}
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/**
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* For the love of god never use this.
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* https://www.php.net/manual/en/function.gethostbyaddr.php#57553
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*/
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public function IPToNames(string $ip): ?array {
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$ret = \gethostbyaddr($ip);
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if ($ret === $ip || $ret === false) {
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return null;
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}
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// Case extravaganza: https://www.php.net/manual/en/function.gethostbyaddr.php#123563
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return [ \strtolower($ret) ];
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}
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}
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