initial commit

.gitignore

@@ -0,0 +1 @@
+/vendor/

README.md

@@ -1,2 +1,34 @@
 # dns-php
-DNS Library for PHP
+
+DNS Library for PHP with native Yggdrasil support
+
+## Install
+
+`composer require yggverse/dns`
+
+## Usage
+
+### Resolve records
+```
+var_dump(
+    \Yggverse\Dns\Dig::records('yo.index', ['A', 'AAAA'])
+);
+```
+
+## Check hostname valid
+
+var_dump(
+    \Yggverse\Dns\Dig::isHostName('yo.index')
+);
+
+## Check record valid
+
+var_dump(
+    \Yggverse\Dns\Dig::isRecord('A')
+);
+
+## Check record value valid
+
+var_dump(
+    \Yggverse\Dns\Dig::isRecordValue('A', '127.0.0.1')
+);

composer.json

@@ -0,0 +1,11 @@
+{
+    "name": "yggverse/dns",
+    "type": "library",
+    "license": "MIT",
+    "autoload": {
+        "psr-4": {
+            "Yggverse\\Dns\\": "src/"
+        }
+    },
+    "require": {}
+}

src/Dig.php

@@ -0,0 +1,58 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yggverse\Dns;
+
+class Dig
+{
+    private static function _records(): array
+    {
+        return
+        [
+            'A'    => function(string $value): bool {return false !== filter_var($value, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4);},
+            'AAAA' => function(string $value): bool {return false !== filter_var($value, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6);},
+            // ...
+        ];
+    }
+
+    public static function isHostName(string $hostname): bool
+    {
+        return false !== filter_var($hostname, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME);
+    }
+
+    public static function isRecord(string $record): bool
+    {
+        return isset(self::_records()[$record]);
+    }
+
+    public static function isRecordValue(string $record, string $value): bool
+    {
+        return isset(self::_records()[$record]) && self::_records()[$record]($value);
+    }
+
+    public static function records(string $hostname, array $records, array &$result = [], array &$error = []): array
+    {
+        if (self::isHostName($hostname))
+        {
+            foreach ($records as $record)
+            {
+                if (self::isRecord($record))
+                {
+                    if ($values = exec(sprintf('dig %s %s +short', $record, $hostname)))
+                    {
+                        foreach (explode(PHP_EOL, $values) as $value)
+                        {
+                            if (self::isRecordValue($record, $value))
+                            {
+                                $result[$record][] = $value;
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        return $result;
+    }
+}