DnsDriver.php: add

inc/Data/Driver/Dns/DnsDriver.php

@@ -0,0 +1,21 @@
+<?php
+namespace Vichan\Data\Driver\Dns;
+
+
+interface DnsDriver {
+	/**
+	 * Resolve a domain name to 1 or more ips.
+	 *
+	 * @param string $name Domain name.
+	 * @return ?array Returns an array of IPv4 and IPv6 addresses or null on error.
+	 */
+	public function nameToIPs(string $name): ?array;
+
+	/**
+	 * Resolve an ip address to a domain name.
+	 *
+	 * @param string $ip Ip address.
+	 * @return ?array Returns the domain names or null on error.
+	 */
+	public function IPToNames(string $ip): ?array;
+}