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<?php |
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namespace SamIT\React\Smtp; |
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use React\Dns\Query\TimeoutException; |
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use React\EventLoop\LoopInterface; |
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use React\EventLoop\Timer\TimerInterface; |
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use React\Socket\ConnectionInterface; |
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use React\Stream\WritableStream; |
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class Connection extends \React\Socket\Connection{ |
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const STATUS_NEW = 0; |
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const STATUS_INIT = 1; |
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const STATUS_FROM = 2; |
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const STATUS_TO = 3; |
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const STATUS_HEADERS = 4; |
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const STATUS_UNFOLDING = 5; |
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const STATUS_BODY = 6; |
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/** |
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* This status is used when all mail data has been received and the system is deciding whether to accept or reject. |
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*/ |
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const STATUS_PROCESSING = 7; |
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const REGEXES = [ |
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'Quit' => '/^QUIT$/', |
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'Helo' => '/^HELO (.*)$/', |
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'Ehlo' => '/^EHLO (.*)$/', |
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'MailFrom' => '/^MAIL FROM:\s*(.*)$/', |
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'Reset' => '/^RSET$/', |
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'RcptTo' => '/^RCPT TO:\s*(.*)$/', |
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'StartData' => '/^DATA$/', |
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'StartHeader' => '/^(\w+):\s*(.*)$/', |
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'StartBody' => '/^$/', |
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'Unfold' => '/^ (.*)$/', |
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'EndData' => '/^\.$/', |
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'BodyLine' => '/^(.*)$/', |
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'EndBody' => '/^\.$/' |
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]; |
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protected $states = [ |
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self::STATUS_NEW => [ |
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'Quit', 'Helo', 'Ehlo' |
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], |
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self::STATUS_INIT => [ |
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'MailFrom', |
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'Quit' |
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], |
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self::STATUS_FROM => [ |
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'RcptTo', |
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'Quit', |
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'Reset', |
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], |
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self::STATUS_TO => [ |
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'Quit', |
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'StartData', |
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'Reset', |
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'RcptTo', |
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], |
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self::STATUS_HEADERS => [ |
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'EndBody', |
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'StartHeader', |
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'StartBody', |
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], |
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self::STATUS_UNFOLDING => [ |
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'StartBody', |
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'EndBody', |
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'Unfold', |
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'StartHeader', |
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], |
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self::STATUS_BODY => [ |
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'EndBody', |
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'BodyLine' |
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], |
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self::STATUS_PROCESSING => [ |
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] |
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]; |
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protected $state = self::STATUS_NEW; |
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protected $banner = 'Welcome to ReactPHP SMTP Server'; |
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/** |
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* @var bool Accept messages by default |
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*/ |
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protected $acceptByDefault = true; |
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/** |
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* If there are event listeners, how long will they get to accept or reject a message? |
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* @var int |
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*/ |
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protected $defaultActionTimeout = 5; |
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/** |
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* The timer for the default action, canceled in [accept] and [reject] |
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* @var TimerInterface |
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*/ |
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protected $defaultActionTimer; |
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/** |
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* The current line buffer used by handleData. |
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* @var string |
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*/ |
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protected $lineBuffer = ''; |
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/** |
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* @var string Name of the header in the foldBuffer. |
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*/ |
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protected $foldHeader = ''; |
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/** |
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* Buffer used for unfolding multiline headers.. |
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* @var string |
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*/ |
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protected $foldBuffer = ''; |
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protected $from; |
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protected $recipients = []; |
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/** |
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* @var Message |
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*/ |
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protected $message; |
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public $bannerDelay = 0; |
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public $recipientLimit = 100; |
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public function __construct($stream, LoopInterface $loop) |
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{ |
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parent::__construct($stream, $loop); |
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stream_get_meta_data($stream); |
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// We sleep for 3 seconds, if client does not wait for our banner we disconnect. |
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$disconnect = function($data, ConnectionInterface $conn) { |
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$conn->end("I can break rules too, bye.\n"); |
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}; |
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$this->on('data', $disconnect); |
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$this->reset(self::STATUS_NEW); |
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$this->on('line', [$this, 'handleCommand']); |
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if ($this->bannerDelay > 0) { |
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$loop->addTimer($this->bannerDelay, function () use ($disconnect) { |
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$this->sendReply(220, $this->banner); |
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$this->removeListener('data', $disconnect); |
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}); |
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} else { |
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$this->sendReply(220, $this->banner); |
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} |
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} |
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/** |
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* We read until we find an and of line sequence for SMTP. |
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* http://www.jebriggs.com/blog/2010/07/smtp-maximum-line-lengths/ |
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* @param $stream |
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*/ |
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public function handleData($stream) |
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{ |
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// Socket is raw, not using fread as it's interceptable by filters |
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// See issues #192, #209, and #240 |
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$data = stream_socket_recvfrom($stream, $this->bufferSize);; |
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$limit = $this->state == self::STATUS_BODY ? 1000 : 512; |
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if ('' !== $data && false !== $data) { |
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$this->lineBuffer .= $data; |
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if (strlen($this->lineBuffer) > $limit) { |
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$this->sendReply(500, "Line length limit exceeded."); |
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$this->lineBuffer = ''; |
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} |
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$delimiter = "\r\n"; |
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while(false !== $pos = strpos($this->lineBuffer, $delimiter)) { |
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$line = substr($this->lineBuffer, 0, $pos); |
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$this->lineBuffer = substr($this->lineBuffer, $pos + strlen($delimiter)); |
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$this->emit('line', [$line, $this]); |
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} |
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} |
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if ('' === $data || false === $data || !is_resource($stream) || feof($stream)) { |
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$this->end(); |
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} |
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} |
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/** |
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* Parses the command from the beginning of the line. |
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* |
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* @param string $line |
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* @return string[] An array containing the command and all arguments. |
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*/ |
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protected function parseCommand($line) |
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{ |
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foreach ($this->states[$this->state] as $key) { |
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if (preg_match(self::REGEXES[$key], $line, $matches) === 1) { |
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$matches[0] = $key; |
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$this->emit('debug', "$line match for $key (" . self::REGEXES[$key] . ")"); |
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return $matches; |
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} else { |
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$this->emit('debug', "$line does not match for $key (" . self::REGEXES[$key] . ")"); |
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} |
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} |
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return [null]; |
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} |
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protected function handleCommand($line) |
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{ |
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$arguments = $this->parseCommand($line); |
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$command = array_shift($arguments); |
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if ($command == null) { |
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$this->sendReply(500, array_merge( |
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$this->states[$this->state], |
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["Unexpected or unknown command."] |
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)); |
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} else { |
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call_user_func_array([$this, "handle{$command}Command"], $arguments); |
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} |
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} |
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protected function sendReply($code, $message, $close = false) |
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{ |
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$out = ''; |
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if (is_array($message)) { |
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$last = array_pop($message); |
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foreach($message as $line) { |
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$out .= "$code-$line\r\n"; |
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} |
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$this->write($out); |
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$message = $last; |
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} |
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if ($close) { |
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$this->end("$code $message\r\n"); |
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} else { |
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$this->write("$code $message\r\n"); |
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} |
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} |
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protected function handleResetCommand($domain) |
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{ |
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$this->reset(); |
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$this->sendReply(250, "Reset OK"); |
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} |
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protected function handleHeloCommand($domain) |
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{ |
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$this->state = self::STATUS_INIT; |
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$this->sendReply(250, "Hello {$this->getRemoteAddress()}"); |
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} |
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protected function handleEhloCommand($domain) |
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{ |
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$this->state = self::STATUS_INIT; |
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$this->sendReply(250, "Hello {$this->getRemoteAddress()}"); |
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} |
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View Code Duplication |
protected function handleMailFromCommand($arguments) |
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{ |
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// Parse the email. |
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if (preg_match('/\<(?<email>.*)\>( .*)?/', $arguments, $matches) == 1) { |
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$this->state = self::STATUS_FROM; |
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$this->from = $matches['email']; |
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$this->sendReply(250, "MAIL OK"); |
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} else { |
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$this->sendReply(500, "Invalid mail argument"); |
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} |
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} |
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protected function handleQuitCommand($arguments) |
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{ |
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$this->sendReply(221, "Goodbye.", true); |
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} |
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View Code Duplication |
protected function handleRcptToCommand($arguments) { |
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// Parse the recipient. |
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if (preg_match('/^(?<name>.*?)\s*?\<(?<email>.*)\>\s*$/', $arguments, $matches) == 1) { |
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// Always set to 3, since this command might occur multiple times. |
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$this->state = self::STATUS_TO; |
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$this->recipients[$matches['email']] = $matches['name']; |
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$this->sendReply(250, "Accepted"); |
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} else { |
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$this->sendReply(500, "Invalid RCPT TO argument."); |
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} |
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} |
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protected function handleStartDataCommand() |
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{ |
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$this->state = self::STATUS_HEADERS; |
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$this->sendReply(354, "Enter message, end with CRLF . CRLF"); |
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} |
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protected function handleUnfoldCommand($content) |
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{ |
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$this->foldBuffer .= $content; |
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} |
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protected function handleStartHeaderCommand($name, $content) |
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{ |
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// Check if status is unfolding. |
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View Code Duplication |
if ($this->state === self::STATUS_UNFOLDING) { |
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$this->message = $this->message->withAddedHeader($this->foldHeader, $this->foldBuffer); |
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} |
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$this->foldBuffer = $content; |
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$this->foldHeader = $name; |
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$this->state = self::STATUS_UNFOLDING; |
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} |
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protected function handleStartBodyCommand() |
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{ |
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// Check if status is unfolding. |
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View Code Duplication |
if ($this->state === self::STATUS_UNFOLDING) { |
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$this->message = $this->message->withAddedHeader($this->foldHeader, $this->foldBuffer); |
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} |
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$this->state = self::STATUS_BODY; |
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} |
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protected function handleEndBodyCommand() |
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{ |
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// Check if status is unfolding. |
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View Code Duplication |
if ($this->state === self::STATUS_UNFOLDING) { |
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$this->message = $this->message->withAddedHeader($this->foldHeader, $this->foldBuffer); |
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} |
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$this->state = self::STATUS_PROCESSING; |
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/** |
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* Default action, using timer so that callbacks above can be called asynchronously. |
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*/ |
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$this->defaultActionTimer = $this->loop->addTimer($this->defaultActionTimeout, function() { |
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if ($this->acceptByDefault) { |
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$this->accept(); |
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} else { |
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$this->reject(); |
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} |
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}); |
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$this->emit('message', [ |
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'from' => $this->from, |
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'recipients' => $this->recipients, |
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'message' => $this->message, |
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'connection' => $this, |
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]); |
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} |
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protected function handleBodyLineCommand($line) |
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{ |
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$this->message->getBody()->write($line); |
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} |
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353
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/** |
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* Reset the SMTP session. |
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* By default goes to the initialized state (ie no new EHLO or HELO is required / possible.) |
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* |
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* @param int $state The state to go to. |
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*/ |
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protected function reset($state = self::STATUS_INIT) { |
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$this->state = $state; |
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$this->from = null; |
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$this->recipients = []; |
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$this->message = new Message(); |
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} |
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View Code Duplication |
public function accept($message = "OK") { |
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|
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if ($this->state != self::STATUS_PROCESSING) { |
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throw new \DomainException("SMTP Connection not in a valid state to accept a message."); |
369
|
|
|
} |
370
|
|
|
$this->loop->cancelTimer($this->defaultActionTimer); |
371
|
|
|
unset($this->defaultActionTimer); |
372
|
|
|
$this->sendReply(250, $message); |
373
|
|
|
$this->reset(); |
374
|
|
|
} |
375
|
|
|
|
376
|
|
View Code Duplication |
public function reject($code = 550, $message = "Message not accepted") { |
|
|
|
|
377
|
|
|
if ($this->state != self::STATUS_PROCESSING) { |
378
|
|
|
throw new \DomainException("SMTP Connection not in a valid state to reject message."); |
379
|
|
|
} |
380
|
|
|
$this->defaultActionTimer->cancel(); |
381
|
|
|
unset($this->defaultActionTimer); |
382
|
|
|
$this->sendReply($code, $message); |
383
|
|
|
$this->reset(); |
384
|
|
|
} |
385
|
|
|
|
386
|
|
|
/** |
387
|
|
|
* Delay the default action by $seconds. |
388
|
|
|
* @param int $seconds |
389
|
|
|
*/ |
390
|
|
|
public function delay($seconds) { |
391
|
|
|
if (isset($this->defaultActionTimer)) { |
392
|
|
|
$this->defaultActionTimer->cancel(); |
393
|
|
|
$this->defaultActionTimer = $this->loop->addTimer($seconds, $this->defaultActionTimer->getCallback()); |
394
|
|
|
} |
395
|
|
|
} |
396
|
|
|
|
397
|
|
|
} |
398
|
|
|
|
It seems like the type of the argument is not accepted by the function/method which you are calling.
In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug.
We suggest to add an explicit type cast like in the following example: