Simple library to check an IP address against a domain's SPF record

This library is available through Composer. Run composer require mika56/spfcheck or add this to your composer.json:

{
  "require": {
    "mika56/spfcheck": "dev-master"
  }
}

Create a new instance of SPFCheck. The constructor requires a DNSRecordGetterInterface to be passed. Currently, only DNSRecordGetter exists, which uses PHP's DNS functions to get data.

<?php
use Mika56\SPFCheck\SPFCheck;
use Mika56\SPFCheck\DNSRecordGetter;

require('vendor/autoload.php');
$checker = new SPFCheck(new DNSRecordGetter());
var_dump($checker->isIPAllowed('127.0.0.1', 'test.com'));

Return value is one of SPFCheck::RESULT_PASS, SPFCheck::RESULT_FAIL, SPFCheck::RESULT_SOFTFAIL, SPFCheck::RESULT_NEUTRAL, SPFCheck::RESULT_NONE, SPFCheck::RESULT_PERMERROR, SPFCheck::RESULT_TEMPERROR

A few features are still missing from this library at the moment. Here's a partial list of those features:

• Section 7 of RFC7208 on macros

You are very welcome to submit a pull request adding even part of those features.