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<?php namespace Egulias\EmailValidator\Validation; use Egulias\EmailValidator\EmailLexer; use Egulias\EmailValidator\Exception\InvalidEmail; use Egulias\EmailValidator\Exception\LocalOrReservedDomain; use Egulias\EmailValidator\Exception\DomainAcceptsNoMail; use Egulias\EmailValidator\Warning\NoDNSMXRecord; use Egulias\EmailValidator\Exception\NoDNSRecord; class DNSCheckValidation implements EmailValidation { /** * @var array */ private $warnings = []; /** * @var InvalidEmail|null */ private $error; /** * @var array */ private $mxRecords = []; public function __construct() { if (!function_exists('idn_to_ascii')) { throw new \LogicException(sprintf('The %s class requires the Intl extension.', __CLASS__)); } } public function isValid($email, EmailLexer $emailLexer) { // use the input to check DNS if we cannot extract something similar to a domain $host = $email; // Arguable pattern to extract the domain. Not aiming to validate the domain nor the email if (false !== $lastAtPos = strrpos($email, '@')) { $host = substr($email, $lastAtPos + 1); } // Get the domain parts $hostParts = explode('.', $host); // Reserved Top Level DNS Names (https://tools.ietf.org/html/rfc2606#section-2), // mDNS and private DNS Namespaces (https://tools.ietf.org/html/rfc6762#appendix-G) $reservedTopLevelDnsNames = [ // Reserved Top Level DNS Names 'test', 'example', 'invalid', 'localhost', // mDNS 'local', // Private DNS Namespaces 'intranet', 'internal', 'private', 'corp', 'home', 'lan', ]; $isLocalDomain = count($hostParts) <= 1; $isReservedTopLevel = in_array($hostParts[(count($hostParts) - 1)], $reservedTopLevelDnsNames, true); // Exclude reserved top level DNS names if ($isLocalDomain || $isReservedTopLevel) { $this->error = new LocalOrReservedDomain(); return false; } return $this->checkDns($host); } public function getError() { return $this->error; } public function getWarnings() { return $this->warnings; } /** * @param string $host * * @return bool */ protected function checkDns($host) { $variant = INTL_IDNA_VARIANT_UTS46; $host = rtrim(idn_to_ascii($host, IDNA_DEFAULT, $variant), '.') . '.'; return $this->validateDnsRecords($host); } /** * Validate the DNS records for given host. * * @param string $host A set of DNS records in the format returned by dns_get_record. * * @return bool True on success. */ private function validateDnsRecords($host) { // Get all MX, A and AAAA DNS records for host // Using @ as workaround to fix https://bugs.php.net/bug.php?id=73149 $dnsRecords = @dns_get_record($host, DNS_MX + DNS_A + DNS_AAAA); // No MX, A or AAAA DNS records if (empty($dnsRecords)) { $this->error = new NoDNSRecord(); return false; } // For each DNS record foreach ($dnsRecords as $dnsRecord) { if (!$this->validateMXRecord($dnsRecord)) { return false; } } // No MX records (fallback to A or AAAA records) if (empty($this->mxRecords)) { $this->warnings[NoDNSMXRecord::CODE] = new NoDNSMXRecord(); } return true; } /** * Validate an MX record * * @param array $dnsRecord Given DNS record. * * @return bool True if valid. */ private function validateMxRecord($dnsRecord) { if ($dnsRecord['type'] !== 'MX') { return true; } // "Null MX" record indicates the domain accepts no mail (https://tools.ietf.org/html/rfc7505) if (empty($dnsRecord['target']) || $dnsRecord['target'] === '.') { $this->error = new DomainAcceptsNoMail(); return false; } $this->mxRecords[] = $dnsRecord; return true; } }