Project import generated by Copybara.
GitOrigin-RevId: 63746295f1a5ab5a619056791995793d65529e62
diff --git a/src/lib/PHPMailer/SMTP.php b/src/lib/PHPMailer/SMTP.php
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+<?php
+
+/**
+ * PHPMailer RFC821 SMTP email transport class.
+ * PHP Version 5.5.
+ *
+ * @see https://github.com/PHPMailer/PHPMailer/ The PHPMailer GitHub project
+ *
+ * @author Marcus Bointon (Synchro/coolbru) <phpmailer@synchromedia.co.uk>
+ * @author Jim Jagielski (jimjag) <jimjag@gmail.com>
+ * @author Andy Prevost (codeworxtech) <codeworxtech@users.sourceforge.net>
+ * @author Brent R. Matzelle (original founder)
+ * @copyright 2012 - 2020 Marcus Bointon
+ * @copyright 2010 - 2012 Jim Jagielski
+ * @copyright 2004 - 2009 Andy Prevost
+ * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
+ * @note This program is distributed in the hope that it will be useful - WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+namespace PHPMailer\PHPMailer;
+
+/**
+ * PHPMailer RFC821 SMTP email transport class.
+ * Implements RFC 821 SMTP commands and provides some utility methods for sending mail to an SMTP server.
+ *
+ * @author Chris Ryan
+ * @author Marcus Bointon <phpmailer@synchromedia.co.uk>
+ */
+class SMTP
+{
+ /**
+ * The PHPMailer SMTP version number.
+ *
+ * @var string
+ */
+ const VERSION = '6.8.1';
+
+ /**
+ * SMTP line break constant.
+ *
+ * @var string
+ */
+ const LE = "\r\n";
+
+ /**
+ * The SMTP port to use if one is not specified.
+ *
+ * @var int
+ */
+ const DEFAULT_PORT = 25;
+
+ /**
+ * The SMTPs port to use if one is not specified.
+ *
+ * @var int
+ */
+ const DEFAULT_SECURE_PORT = 465;
+
+ /**
+ * The maximum line length allowed by RFC 5321 section 4.5.3.1.6,
+ * *excluding* a trailing CRLF break.
+ *
+ * @see https://tools.ietf.org/html/rfc5321#section-4.5.3.1.6
+ *
+ * @var int
+ */
+ const MAX_LINE_LENGTH = 998;
+
+ /**
+ * The maximum line length allowed for replies in RFC 5321 section 4.5.3.1.5,
+ * *including* a trailing CRLF line break.
+ *
+ * @see https://tools.ietf.org/html/rfc5321#section-4.5.3.1.5
+ *
+ * @var int
+ */
+ const MAX_REPLY_LENGTH = 512;
+
+ /**
+ * Debug level for no output.
+ *
+ * @var int
+ */
+ const DEBUG_OFF = 0;
+
+ /**
+ * Debug level to show client -> server messages.
+ *
+ * @var int
+ */
+ const DEBUG_CLIENT = 1;
+
+ /**
+ * Debug level to show client -> server and server -> client messages.
+ *
+ * @var int
+ */
+ const DEBUG_SERVER = 2;
+
+ /**
+ * Debug level to show connection status, client -> server and server -> client messages.
+ *
+ * @var int
+ */
+ const DEBUG_CONNECTION = 3;
+
+ /**
+ * Debug level to show all messages.
+ *
+ * @var int
+ */
+ const DEBUG_LOWLEVEL = 4;
+
+ /**
+ * Debug output level.
+ * Options:
+ * * self::DEBUG_OFF (`0`) No debug output, default
+ * * self::DEBUG_CLIENT (`1`) Client commands
+ * * self::DEBUG_SERVER (`2`) Client commands and server responses
+ * * self::DEBUG_CONNECTION (`3`) As DEBUG_SERVER plus connection status
+ * * self::DEBUG_LOWLEVEL (`4`) Low-level data output, all messages.
+ *
+ * @var int
+ */
+ public $do_debug = self::DEBUG_OFF;
+
+ /**
+ * How to handle debug output.
+ * Options:
+ * * `echo` Output plain-text as-is, appropriate for CLI
+ * * `html` Output escaped, line breaks converted to `<br>`, appropriate for browser output
+ * * `error_log` Output to error log as configured in php.ini
+ * Alternatively, you can provide a callable expecting two params: a message string and the debug level:
+ *
+ * ```php
+ * $smtp->Debugoutput = function($str, $level) {echo "debug level $level; message: $str";};
+ * ```
+ *
+ * Alternatively, you can pass in an instance of a PSR-3 compatible logger, though only `debug`
+ * level output is used:
+ *
+ * ```php
+ * $mail->Debugoutput = new myPsr3Logger;
+ * ```
+ *
+ * @var string|callable|\Psr\Log\LoggerInterface
+ */
+ public $Debugoutput = 'echo';
+
+ /**
+ * Whether to use VERP.
+ *
+ * @see http://en.wikipedia.org/wiki/Variable_envelope_return_path
+ * @see http://www.postfix.org/VERP_README.html Info on VERP
+ *
+ * @var bool
+ */
+ public $do_verp = false;
+
+ /**
+ * The timeout value for connection, in seconds.
+ * Default of 5 minutes (300sec) is from RFC2821 section 4.5.3.2.
+ * This needs to be quite high to function correctly with hosts using greetdelay as an anti-spam measure.
+ *
+ * @see http://tools.ietf.org/html/rfc2821#section-4.5.3.2
+ *
+ * @var int
+ */
+ public $Timeout = 300;
+
+ /**
+ * How long to wait for commands to complete, in seconds.
+ * Default of 5 minutes (300sec) is from RFC2821 section 4.5.3.2.
+ *
+ * @var int
+ */
+ public $Timelimit = 300;
+
+ /**
+ * Patterns to extract an SMTP transaction id from reply to a DATA command.
+ * The first capture group in each regex will be used as the ID.
+ * MS ESMTP returns the message ID, which may not be correct for internal tracking.
+ *
+ * @var string[]
+ */
+ protected $smtp_transaction_id_patterns = [
+ 'exim' => '/[\d]{3} OK id=(.*)/',
+ 'sendmail' => '/[\d]{3} 2.0.0 (.*) Message/',
+ 'postfix' => '/[\d]{3} 2.0.0 Ok: queued as (.*)/',
+ 'Microsoft_ESMTP' => '/[0-9]{3} 2.[\d].0 (.*)@(?:.*) Queued mail for delivery/',
+ 'Amazon_SES' => '/[\d]{3} Ok (.*)/',
+ 'SendGrid' => '/[\d]{3} Ok: queued as (.*)/',
+ 'CampaignMonitor' => '/[\d]{3} 2.0.0 OK:([a-zA-Z\d]{48})/',
+ 'Haraka' => '/[\d]{3} Message Queued \((.*)\)/',
+ 'ZoneMTA' => '/[\d]{3} Message queued as (.*)/',
+ 'Mailjet' => '/[\d]{3} OK queued as (.*)/',
+ ];
+
+ /**
+ * The last transaction ID issued in response to a DATA command,
+ * if one was detected.
+ *
+ * @var string|bool|null
+ */
+ protected $last_smtp_transaction_id;
+
+ /**
+ * The socket for the server connection.
+ *
+ * @var ?resource
+ */
+ protected $smtp_conn;
+
+ /**
+ * Error information, if any, for the last SMTP command.
+ *
+ * @var array
+ */
+ protected $error = [
+ 'error' => '',
+ 'detail' => '',
+ 'smtp_code' => '',
+ 'smtp_code_ex' => '',
+ ];
+
+ /**
+ * The reply the server sent to us for HELO.
+ * If null, no HELO string has yet been received.
+ *
+ * @var string|null
+ */
+ protected $helo_rply;
+
+ /**
+ * The set of SMTP extensions sent in reply to EHLO command.
+ * Indexes of the array are extension names.
+ * Value at index 'HELO' or 'EHLO' (according to command that was sent)
+ * represents the server name. In case of HELO it is the only element of the array.
+ * Other values can be boolean TRUE or an array containing extension options.
+ * If null, no HELO/EHLO string has yet been received.
+ *
+ * @var array|null
+ */
+ protected $server_caps;
+
+ /**
+ * The most recent reply received from the server.
+ *
+ * @var string
+ */
+ protected $last_reply = '';
+
+ /**
+ * Output debugging info via a user-selected method.
+ *
+ * @param string $str Debug string to output
+ * @param int $level The debug level of this message; see DEBUG_* constants
+ *
+ * @see SMTP::$Debugoutput
+ * @see SMTP::$do_debug
+ */
+ protected function edebug($str, $level = 0)
+ {
+ if ($level > $this->do_debug) {
+ return;
+ }
+ //Is this a PSR-3 logger?
+ if ($this->Debugoutput instanceof \Psr\Log\LoggerInterface) {
+ $this->Debugoutput->debug($str);
+
+ return;
+ }
+ //Avoid clash with built-in function names
+ if (is_callable($this->Debugoutput) && !in_array($this->Debugoutput, ['error_log', 'html', 'echo'])) {
+ call_user_func($this->Debugoutput, $str, $level);
+
+ return;
+ }
+ switch ($this->Debugoutput) {
+ case 'error_log':
+ //Don't output, just log
+ error_log($str);
+ break;
+ case 'html':
+ //Cleans up output a bit for a better looking, HTML-safe output
+ echo gmdate('Y-m-d H:i:s'), ' ', htmlentities(
+ preg_replace('/[\r\n]+/', '', $str),
+ ENT_QUOTES,
+ 'UTF-8'
+ ), "<br>\n";
+ break;
+ case 'echo':
+ default:
+ //Normalize line breaks
+ $str = preg_replace('/\r\n|\r/m', "\n", $str);
+ echo gmdate('Y-m-d H:i:s'),
+ "\t",
+ //Trim trailing space
+ trim(
+ //Indent for readability, except for trailing break
+ str_replace(
+ "\n",
+ "\n \t ",
+ trim($str)
+ )
+ ),
+ "\n";
+ }
+ }
+
+ /**
+ * Connect to an SMTP server.
+ *
+ * @param string $host SMTP server IP or host name
+ * @param int $port The port number to connect to
+ * @param int $timeout How long to wait for the connection to open
+ * @param array $options An array of options for stream_context_create()
+ *
+ * @return bool
+ */
+ public function connect($host, $port = null, $timeout = 30, $options = [])
+ {
+ //Clear errors to avoid confusion
+ $this->setError('');
+ //Make sure we are __not__ connected
+ if ($this->connected()) {
+ //Already connected, generate error
+ $this->setError('Already connected to a server');
+
+ return false;
+ }
+ if (empty($port)) {
+ $port = self::DEFAULT_PORT;
+ }
+ //Connect to the SMTP server
+ $this->edebug(
+ "Connection: opening to $host:$port, timeout=$timeout, options=" .
+ (count($options) > 0 ? var_export($options, true) : 'array()'),
+ self::DEBUG_CONNECTION
+ );
+
+ $this->smtp_conn = $this->getSMTPConnection($host, $port, $timeout, $options);
+
+ if ($this->smtp_conn === false) {
+ //Error info already set inside `getSMTPConnection()`
+ return false;
+ }
+
+ $this->edebug('Connection: opened', self::DEBUG_CONNECTION);
+
+ //Get any announcement
+ $this->last_reply = $this->get_lines();
+ $this->edebug('SERVER -> CLIENT: ' . $this->last_reply, self::DEBUG_SERVER);
+ $responseCode = (int)substr($this->last_reply, 0, 3);
+ if ($responseCode === 220) {
+ return true;
+ }
+ //Anything other than a 220 response means something went wrong
+ //RFC 5321 says the server will wait for us to send a QUIT in response to a 554 error
+ //https://tools.ietf.org/html/rfc5321#section-3.1
+ if ($responseCode === 554) {
+ $this->quit();
+ }
+ //This will handle 421 responses which may not wait for a QUIT (e.g. if the server is being shut down)
+ $this->edebug('Connection: closing due to error', self::DEBUG_CONNECTION);
+ $this->close();
+ return false;
+ }
+
+ /**
+ * Create connection to the SMTP server.
+ *
+ * @param string $host SMTP server IP or host name
+ * @param int $port The port number to connect to
+ * @param int $timeout How long to wait for the connection to open
+ * @param array $options An array of options for stream_context_create()
+ *
+ * @return false|resource
+ */
+ protected function getSMTPConnection($host, $port = null, $timeout = 30, $options = [])
+ {
+ static $streamok;
+ //This is enabled by default since 5.0.0 but some providers disable it
+ //Check this once and cache the result
+ if (null === $streamok) {
+ $streamok = function_exists('stream_socket_client');
+ }
+
+ $errno = 0;
+ $errstr = '';
+ if ($streamok) {
+ $socket_context = stream_context_create($options);
+ set_error_handler([$this, 'errorHandler']);
+ $connection = stream_socket_client(
+ $host . ':' . $port,
+ $errno,
+ $errstr,
+ $timeout,
+ STREAM_CLIENT_CONNECT,
+ $socket_context
+ );
+ } else {
+ //Fall back to fsockopen which should work in more places, but is missing some features
+ $this->edebug(
+ 'Connection: stream_socket_client not available, falling back to fsockopen',
+ self::DEBUG_CONNECTION
+ );
+ set_error_handler([$this, 'errorHandler']);
+ $connection = fsockopen(
+ $host,
+ $port,
+ $errno,
+ $errstr,
+ $timeout
+ );
+ }
+ restore_error_handler();
+
+ //Verify we connected properly
+ if (!is_resource($connection)) {
+ $this->setError(
+ 'Failed to connect to server',
+ '',
+ (string) $errno,
+ $errstr
+ );
+ $this->edebug(
+ 'SMTP ERROR: ' . $this->error['error']
+ . ": $errstr ($errno)",
+ self::DEBUG_CLIENT
+ );
+
+ return false;
+ }
+
+ //SMTP server can take longer to respond, give longer timeout for first read
+ //Windows does not have support for this timeout function
+ if (strpos(PHP_OS, 'WIN') !== 0) {
+ $max = (int)ini_get('max_execution_time');
+ //Don't bother if unlimited, or if set_time_limit is disabled
+ if (0 !== $max && $timeout > $max && strpos(ini_get('disable_functions'), 'set_time_limit') === false) {
+ @set_time_limit($timeout);
+ }
+ stream_set_timeout($connection, $timeout, 0);
+ }
+
+ return $connection;
+ }
+
+ /**
+ * Initiate a TLS (encrypted) session.
+ *
+ * @return bool
+ */
+ public function startTLS()
+ {
+ if (!$this->sendCommand('STARTTLS', 'STARTTLS', 220)) {
+ return false;
+ }
+
+ //Allow the best TLS version(s) we can
+ $crypto_method = STREAM_CRYPTO_METHOD_TLS_CLIENT;
+
+ //PHP 5.6.7 dropped inclusion of TLS 1.1 and 1.2 in STREAM_CRYPTO_METHOD_TLS_CLIENT
+ //so add them back in manually if we can
+ if (defined('STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT')) {
+ $crypto_method |= STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT;
+ $crypto_method |= STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT;
+ }
+
+ //Begin encrypted connection
+ set_error_handler([$this, 'errorHandler']);
+ $crypto_ok = stream_socket_enable_crypto(
+ $this->smtp_conn,
+ true,
+ $crypto_method
+ );
+ restore_error_handler();
+
+ return (bool) $crypto_ok;
+ }
+
+ /**
+ * Perform SMTP authentication.
+ * Must be run after hello().
+ *
+ * @see hello()
+ *
+ * @param string $username The user name
+ * @param string $password The password
+ * @param string $authtype The auth type (CRAM-MD5, PLAIN, LOGIN, XOAUTH2)
+ * @param OAuthTokenProvider $OAuth An optional OAuthTokenProvider instance for XOAUTH2 authentication
+ *
+ * @return bool True if successfully authenticated
+ */
+ public function authenticate(
+ $username,
+ $password,
+ $authtype = null,
+ $OAuth = null
+ ) {
+ if (!$this->server_caps) {
+ $this->setError('Authentication is not allowed before HELO/EHLO');
+
+ return false;
+ }
+
+ if (array_key_exists('EHLO', $this->server_caps)) {
+ //SMTP extensions are available; try to find a proper authentication method
+ if (!array_key_exists('AUTH', $this->server_caps)) {
+ $this->setError('Authentication is not allowed at this stage');
+ //'at this stage' means that auth may be allowed after the stage changes
+ //e.g. after STARTTLS
+
+ return false;
+ }
+
+ $this->edebug('Auth method requested: ' . ($authtype ?: 'UNSPECIFIED'), self::DEBUG_LOWLEVEL);
+ $this->edebug(
+ 'Auth methods available on the server: ' . implode(',', $this->server_caps['AUTH']),
+ self::DEBUG_LOWLEVEL
+ );
+
+ //If we have requested a specific auth type, check the server supports it before trying others
+ if (null !== $authtype && !in_array($authtype, $this->server_caps['AUTH'], true)) {
+ $this->edebug('Requested auth method not available: ' . $authtype, self::DEBUG_LOWLEVEL);
+ $authtype = null;
+ }
+
+ if (empty($authtype)) {
+ //If no auth mechanism is specified, attempt to use these, in this order
+ //Try CRAM-MD5 first as it's more secure than the others
+ foreach (['CRAM-MD5', 'LOGIN', 'PLAIN', 'XOAUTH2'] as $method) {
+ if (in_array($method, $this->server_caps['AUTH'], true)) {
+ $authtype = $method;
+ break;
+ }
+ }
+ if (empty($authtype)) {
+ $this->setError('No supported authentication methods found');
+
+ return false;
+ }
+ $this->edebug('Auth method selected: ' . $authtype, self::DEBUG_LOWLEVEL);
+ }
+
+ if (!in_array($authtype, $this->server_caps['AUTH'], true)) {
+ $this->setError("The requested authentication method \"$authtype\" is not supported by the server");
+
+ return false;
+ }
+ } elseif (empty($authtype)) {
+ $authtype = 'LOGIN';
+ }
+ switch ($authtype) {
+ case 'PLAIN':
+ //Start authentication
+ if (!$this->sendCommand('AUTH', 'AUTH PLAIN', 334)) {
+ return false;
+ }
+ //Send encoded username and password
+ if (
+ //Format from https://tools.ietf.org/html/rfc4616#section-2
+ //We skip the first field (it's forgery), so the string starts with a null byte
+ !$this->sendCommand(
+ 'User & Password',
+ base64_encode("\0" . $username . "\0" . $password),
+ 235
+ )
+ ) {
+ return false;
+ }
+ break;
+ case 'LOGIN':
+ //Start authentication
+ if (!$this->sendCommand('AUTH', 'AUTH LOGIN', 334)) {
+ return false;
+ }
+ if (!$this->sendCommand('Username', base64_encode($username), 334)) {
+ return false;
+ }
+ if (!$this->sendCommand('Password', base64_encode($password), 235)) {
+ return false;
+ }
+ break;
+ case 'CRAM-MD5':
+ //Start authentication
+ if (!$this->sendCommand('AUTH CRAM-MD5', 'AUTH CRAM-MD5', 334)) {
+ return false;
+ }
+ //Get the challenge
+ $challenge = base64_decode(substr($this->last_reply, 4));
+
+ //Build the response
+ $response = $username . ' ' . $this->hmac($challenge, $password);
+
+ //send encoded credentials
+ return $this->sendCommand('Username', base64_encode($response), 235);
+ case 'XOAUTH2':
+ //The OAuth instance must be set up prior to requesting auth.
+ if (null === $OAuth) {
+ return false;
+ }
+ $oauth = $OAuth->getOauth64();
+
+ //Start authentication
+ if (!$this->sendCommand('AUTH', 'AUTH XOAUTH2 ' . $oauth, 235)) {
+ return false;
+ }
+ break;
+ default:
+ $this->setError("Authentication method \"$authtype\" is not supported");
+
+ return false;
+ }
+
+ return true;
+ }
+
+ /**
+ * Calculate an MD5 HMAC hash.
+ * Works like hash_hmac('md5', $data, $key)
+ * in case that function is not available.
+ *
+ * @param string $data The data to hash
+ * @param string $key The key to hash with
+ *
+ * @return string
+ */
+ protected function hmac($data, $key)
+ {
+ if (function_exists('hash_hmac')) {
+ return hash_hmac('md5', $data, $key);
+ }
+
+ //The following borrowed from
+ //http://php.net/manual/en/function.mhash.php#27225
+
+ //RFC 2104 HMAC implementation for php.
+ //Creates an md5 HMAC.
+ //Eliminates the need to install mhash to compute a HMAC
+ //by Lance Rushing
+
+ $bytelen = 64; //byte length for md5
+ if (strlen($key) > $bytelen) {
+ $key = pack('H*', md5($key));
+ }
+ $key = str_pad($key, $bytelen, chr(0x00));
+ $ipad = str_pad('', $bytelen, chr(0x36));
+ $opad = str_pad('', $bytelen, chr(0x5c));
+ $k_ipad = $key ^ $ipad;
+ $k_opad = $key ^ $opad;
+
+ return md5($k_opad . pack('H*', md5($k_ipad . $data)));
+ }
+
+ /**
+ * Check connection state.
+ *
+ * @return bool True if connected
+ */
+ public function connected()
+ {
+ if (is_resource($this->smtp_conn)) {
+ $sock_status = stream_get_meta_data($this->smtp_conn);
+ if ($sock_status['eof']) {
+ //The socket is valid but we are not connected
+ $this->edebug(
+ 'SMTP NOTICE: EOF caught while checking if connected',
+ self::DEBUG_CLIENT
+ );
+ $this->close();
+
+ return false;
+ }
+
+ return true; //everything looks good
+ }
+
+ return false;
+ }
+
+ /**
+ * Close the socket and clean up the state of the class.
+ * Don't use this function without first trying to use QUIT.
+ *
+ * @see quit()
+ */
+ public function close()
+ {
+ $this->server_caps = null;
+ $this->helo_rply = null;
+ if (is_resource($this->smtp_conn)) {
+ //Close the connection and cleanup
+ fclose($this->smtp_conn);
+ $this->smtp_conn = null; //Makes for cleaner serialization
+ $this->edebug('Connection: closed', self::DEBUG_CONNECTION);
+ }
+ }
+
+ /**
+ * Send an SMTP DATA command.
+ * Issues a data command and sends the msg_data to the server,
+ * finalizing the mail transaction. $msg_data is the message
+ * that is to be sent with the headers. Each header needs to be
+ * on a single line followed by a <CRLF> with the message headers
+ * and the message body being separated by an additional <CRLF>.
+ * Implements RFC 821: DATA <CRLF>.
+ *
+ * @param string $msg_data Message data to send
+ *
+ * @return bool
+ */
+ public function data($msg_data)
+ {
+ //This will use the standard timelimit
+ if (!$this->sendCommand('DATA', 'DATA', 354)) {
+ return false;
+ }
+
+ /* The server is ready to accept data!
+ * According to rfc821 we should not send more than 1000 characters on a single line (including the LE)
+ * so we will break the data up into lines by \r and/or \n then if needed we will break each of those into
+ * smaller lines to fit within the limit.
+ * We will also look for lines that start with a '.' and prepend an additional '.'.
+ * NOTE: this does not count towards line-length limit.
+ */
+
+ //Normalize line breaks before exploding
+ $lines = explode("\n", str_replace(["\r\n", "\r"], "\n", $msg_data));
+
+ /* To distinguish between a complete RFC822 message and a plain message body, we check if the first field
+ * of the first line (':' separated) does not contain a space then it _should_ be a header, and we will
+ * process all lines before a blank line as headers.
+ */
+
+ $field = substr($lines[0], 0, strpos($lines[0], ':'));
+ $in_headers = false;
+ if (!empty($field) && strpos($field, ' ') === false) {
+ $in_headers = true;
+ }
+
+ foreach ($lines as $line) {
+ $lines_out = [];
+ if ($in_headers && $line === '') {
+ $in_headers = false;
+ }
+ //Break this line up into several smaller lines if it's too long
+ //Micro-optimisation: isset($str[$len]) is faster than (strlen($str) > $len),
+ while (isset($line[self::MAX_LINE_LENGTH])) {
+ //Working backwards, try to find a space within the last MAX_LINE_LENGTH chars of the line to break on
+ //so as to avoid breaking in the middle of a word
+ $pos = strrpos(substr($line, 0, self::MAX_LINE_LENGTH), ' ');
+ //Deliberately matches both false and 0
+ if (!$pos) {
+ //No nice break found, add a hard break
+ $pos = self::MAX_LINE_LENGTH - 1;
+ $lines_out[] = substr($line, 0, $pos);
+ $line = substr($line, $pos);
+ } else {
+ //Break at the found point
+ $lines_out[] = substr($line, 0, $pos);
+ //Move along by the amount we dealt with
+ $line = substr($line, $pos + 1);
+ }
+ //If processing headers add a LWSP-char to the front of new line RFC822 section 3.1.1
+ if ($in_headers) {
+ $line = "\t" . $line;
+ }
+ }
+ $lines_out[] = $line;
+
+ //Send the lines to the server
+ foreach ($lines_out as $line_out) {
+ //Dot-stuffing as per RFC5321 section 4.5.2
+ //https://tools.ietf.org/html/rfc5321#section-4.5.2
+ if (!empty($line_out) && $line_out[0] === '.') {
+ $line_out = '.' . $line_out;
+ }
+ $this->client_send($line_out . static::LE, 'DATA');
+ }
+ }
+
+ //Message data has been sent, complete the command
+ //Increase timelimit for end of DATA command
+ $savetimelimit = $this->Timelimit;
+ $this->Timelimit *= 2;
+ $result = $this->sendCommand('DATA END', '.', 250);
+ $this->recordLastTransactionID();
+ //Restore timelimit
+ $this->Timelimit = $savetimelimit;
+
+ return $result;
+ }
+
+ /**
+ * Send an SMTP HELO or EHLO command.
+ * Used to identify the sending server to the receiving server.
+ * This makes sure that client and server are in a known state.
+ * Implements RFC 821: HELO <SP> <domain> <CRLF>
+ * and RFC 2821 EHLO.
+ *
+ * @param string $host The host name or IP to connect to
+ *
+ * @return bool
+ */
+ public function hello($host = '')
+ {
+ //Try extended hello first (RFC 2821)
+ if ($this->sendHello('EHLO', $host)) {
+ return true;
+ }
+
+ //Some servers shut down the SMTP service here (RFC 5321)
+ if (substr($this->helo_rply, 0, 3) == '421') {
+ return false;
+ }
+
+ return $this->sendHello('HELO', $host);
+ }
+
+ /**
+ * Send an SMTP HELO or EHLO command.
+ * Low-level implementation used by hello().
+ *
+ * @param string $hello The HELO string
+ * @param string $host The hostname to say we are
+ *
+ * @return bool
+ *
+ * @see hello()
+ */
+ protected function sendHello($hello, $host)
+ {
+ $noerror = $this->sendCommand($hello, $hello . ' ' . $host, 250);
+ $this->helo_rply = $this->last_reply;
+ if ($noerror) {
+ $this->parseHelloFields($hello);
+ } else {
+ $this->server_caps = null;
+ }
+
+ return $noerror;
+ }
+
+ /**
+ * Parse a reply to HELO/EHLO command to discover server extensions.
+ * In case of HELO, the only parameter that can be discovered is a server name.
+ *
+ * @param string $type `HELO` or `EHLO`
+ */
+ protected function parseHelloFields($type)
+ {
+ $this->server_caps = [];
+ $lines = explode("\n", $this->helo_rply);
+
+ foreach ($lines as $n => $s) {
+ //First 4 chars contain response code followed by - or space
+ $s = trim(substr($s, 4));
+ if (empty($s)) {
+ continue;
+ }
+ $fields = explode(' ', $s);
+ if (!empty($fields)) {
+ if (!$n) {
+ $name = $type;
+ $fields = $fields[0];
+ } else {
+ $name = array_shift($fields);
+ switch ($name) {
+ case 'SIZE':
+ $fields = ($fields ? $fields[0] : 0);
+ break;
+ case 'AUTH':
+ if (!is_array($fields)) {
+ $fields = [];
+ }
+ break;
+ default:
+ $fields = true;
+ }
+ }
+ $this->server_caps[$name] = $fields;
+ }
+ }
+ }
+
+ /**
+ * Send an SMTP MAIL command.
+ * Starts a mail transaction from the email address specified in
+ * $from. Returns true if successful or false otherwise. If True
+ * the mail transaction is started and then one or more recipient
+ * commands may be called followed by a data command.
+ * Implements RFC 821: MAIL <SP> FROM:<reverse-path> <CRLF>.
+ *
+ * @param string $from Source address of this message
+ *
+ * @return bool
+ */
+ public function mail($from)
+ {
+ $useVerp = ($this->do_verp ? ' XVERP' : '');
+
+ return $this->sendCommand(
+ 'MAIL FROM',
+ 'MAIL FROM:<' . $from . '>' . $useVerp,
+ 250
+ );
+ }
+
+ /**
+ * Send an SMTP QUIT command.
+ * Closes the socket if there is no error or the $close_on_error argument is true.
+ * Implements from RFC 821: QUIT <CRLF>.
+ *
+ * @param bool $close_on_error Should the connection close if an error occurs?
+ *
+ * @return bool
+ */
+ public function quit($close_on_error = true)
+ {
+ $noerror = $this->sendCommand('QUIT', 'QUIT', 221);
+ $err = $this->error; //Save any error
+ if ($noerror || $close_on_error) {
+ $this->close();
+ $this->error = $err; //Restore any error from the quit command
+ }
+
+ return $noerror;
+ }
+
+ /**
+ * Send an SMTP RCPT command.
+ * Sets the TO argument to $toaddr.
+ * Returns true if the recipient was accepted false if it was rejected.
+ * Implements from RFC 821: RCPT <SP> TO:<forward-path> <CRLF>.
+ *
+ * @param string $address The address the message is being sent to
+ * @param string $dsn Comma separated list of DSN notifications. NEVER, SUCCESS, FAILURE
+ * or DELAY. If you specify NEVER all other notifications are ignored.
+ *
+ * @return bool
+ */
+ public function recipient($address, $dsn = '')
+ {
+ if (empty($dsn)) {
+ $rcpt = 'RCPT TO:<' . $address . '>';
+ } else {
+ $dsn = strtoupper($dsn);
+ $notify = [];
+
+ if (strpos($dsn, 'NEVER') !== false) {
+ $notify[] = 'NEVER';
+ } else {
+ foreach (['SUCCESS', 'FAILURE', 'DELAY'] as $value) {
+ if (strpos($dsn, $value) !== false) {
+ $notify[] = $value;
+ }
+ }
+ }
+
+ $rcpt = 'RCPT TO:<' . $address . '> NOTIFY=' . implode(',', $notify);
+ }
+
+ return $this->sendCommand(
+ 'RCPT TO',
+ $rcpt,
+ [250, 251]
+ );
+ }
+
+ /**
+ * Send an SMTP RSET command.
+ * Abort any transaction that is currently in progress.
+ * Implements RFC 821: RSET <CRLF>.
+ *
+ * @return bool True on success
+ */
+ public function reset()
+ {
+ return $this->sendCommand('RSET', 'RSET', 250);
+ }
+
+ /**
+ * Send a command to an SMTP server and check its return code.
+ *
+ * @param string $command The command name - not sent to the server
+ * @param string $commandstring The actual command to send
+ * @param int|array $expect One or more expected integer success codes
+ *
+ * @return bool True on success
+ */
+ protected function sendCommand($command, $commandstring, $expect)
+ {
+ if (!$this->connected()) {
+ $this->setError("Called $command without being connected");
+
+ return false;
+ }
+ //Reject line breaks in all commands
+ if ((strpos($commandstring, "\n") !== false) || (strpos($commandstring, "\r") !== false)) {
+ $this->setError("Command '$command' contained line breaks");
+
+ return false;
+ }
+ $this->client_send($commandstring . static::LE, $command);
+
+ $this->last_reply = $this->get_lines();
+ //Fetch SMTP code and possible error code explanation
+ $matches = [];
+ if (preg_match('/^([\d]{3})[ -](?:([\d]\\.[\d]\\.[\d]{1,2}) )?/', $this->last_reply, $matches)) {
+ $code = (int) $matches[1];
+ $code_ex = (count($matches) > 2 ? $matches[2] : null);
+ //Cut off error code from each response line
+ $detail = preg_replace(
+ "/{$code}[ -]" .
+ ($code_ex ? str_replace('.', '\\.', $code_ex) . ' ' : '') . '/m',
+ '',
+ $this->last_reply
+ );
+ } else {
+ //Fall back to simple parsing if regex fails
+ $code = (int) substr($this->last_reply, 0, 3);
+ $code_ex = null;
+ $detail = substr($this->last_reply, 4);
+ }
+
+ $this->edebug('SERVER -> CLIENT: ' . $this->last_reply, self::DEBUG_SERVER);
+
+ if (!in_array($code, (array) $expect, true)) {
+ $this->setError(
+ "$command command failed",
+ $detail,
+ $code,
+ $code_ex
+ );
+ $this->edebug(
+ 'SMTP ERROR: ' . $this->error['error'] . ': ' . $this->last_reply,
+ self::DEBUG_CLIENT
+ );
+
+ return false;
+ }
+
+ //Don't clear the error store when using keepalive
+ if ($command !== 'RSET') {
+ $this->setError('');
+ }
+
+ return true;
+ }
+
+ /**
+ * Send an SMTP SAML command.
+ * Starts a mail transaction from the email address specified in $from.
+ * Returns true if successful or false otherwise. If True
+ * the mail transaction is started and then one or more recipient
+ * commands may be called followed by a data command. This command
+ * will send the message to the users terminal if they are logged
+ * in and send them an email.
+ * Implements RFC 821: SAML <SP> FROM:<reverse-path> <CRLF>.
+ *
+ * @param string $from The address the message is from
+ *
+ * @return bool
+ */
+ public function sendAndMail($from)
+ {
+ return $this->sendCommand('SAML', "SAML FROM:$from", 250);
+ }
+
+ /**
+ * Send an SMTP VRFY command.
+ *
+ * @param string $name The name to verify
+ *
+ * @return bool
+ */
+ public function verify($name)
+ {
+ return $this->sendCommand('VRFY', "VRFY $name", [250, 251]);
+ }
+
+ /**
+ * Send an SMTP NOOP command.
+ * Used to keep keep-alives alive, doesn't actually do anything.
+ *
+ * @return bool
+ */
+ public function noop()
+ {
+ return $this->sendCommand('NOOP', 'NOOP', 250);
+ }
+
+ /**
+ * Send an SMTP TURN command.
+ * This is an optional command for SMTP that this class does not support.
+ * This method is here to make the RFC821 Definition complete for this class
+ * and _may_ be implemented in future.
+ * Implements from RFC 821: TURN <CRLF>.
+ *
+ * @return bool
+ */
+ public function turn()
+ {
+ $this->setError('The SMTP TURN command is not implemented');
+ $this->edebug('SMTP NOTICE: ' . $this->error['error'], self::DEBUG_CLIENT);
+
+ return false;
+ }
+
+ /**
+ * Send raw data to the server.
+ *
+ * @param string $data The data to send
+ * @param string $command Optionally, the command this is part of, used only for controlling debug output
+ *
+ * @return int|bool The number of bytes sent to the server or false on error
+ */
+ public function client_send($data, $command = '')
+ {
+ //If SMTP transcripts are left enabled, or debug output is posted online
+ //it can leak credentials, so hide credentials in all but lowest level
+ if (
+ self::DEBUG_LOWLEVEL > $this->do_debug &&
+ in_array($command, ['User & Password', 'Username', 'Password'], true)
+ ) {
+ $this->edebug('CLIENT -> SERVER: [credentials hidden]', self::DEBUG_CLIENT);
+ } else {
+ $this->edebug('CLIENT -> SERVER: ' . $data, self::DEBUG_CLIENT);
+ }
+ set_error_handler([$this, 'errorHandler']);
+ $result = fwrite($this->smtp_conn, $data);
+ restore_error_handler();
+
+ return $result;
+ }
+
+ /**
+ * Get the latest error.
+ *
+ * @return array
+ */
+ public function getError()
+ {
+ return $this->error;
+ }
+
+ /**
+ * Get SMTP extensions available on the server.
+ *
+ * @return array|null
+ */
+ public function getServerExtList()
+ {
+ return $this->server_caps;
+ }
+
+ /**
+ * Get metadata about the SMTP server from its HELO/EHLO response.
+ * The method works in three ways, dependent on argument value and current state:
+ * 1. HELO/EHLO has not been sent - returns null and populates $this->error.
+ * 2. HELO has been sent -
+ * $name == 'HELO': returns server name
+ * $name == 'EHLO': returns boolean false
+ * $name == any other string: returns null and populates $this->error
+ * 3. EHLO has been sent -
+ * $name == 'HELO'|'EHLO': returns the server name
+ * $name == any other string: if extension $name exists, returns True
+ * or its options (e.g. AUTH mechanisms supported). Otherwise returns False.
+ *
+ * @param string $name Name of SMTP extension or 'HELO'|'EHLO'
+ *
+ * @return string|bool|null
+ */
+ public function getServerExt($name)
+ {
+ if (!$this->server_caps) {
+ $this->setError('No HELO/EHLO was sent');
+
+ return null;
+ }
+
+ if (!array_key_exists($name, $this->server_caps)) {
+ if ('HELO' === $name) {
+ return $this->server_caps['EHLO'];
+ }
+ if ('EHLO' === $name || array_key_exists('EHLO', $this->server_caps)) {
+ return false;
+ }
+ $this->setError('HELO handshake was used; No information about server extensions available');
+
+ return null;
+ }
+
+ return $this->server_caps[$name];
+ }
+
+ /**
+ * Get the last reply from the server.
+ *
+ * @return string
+ */
+ public function getLastReply()
+ {
+ return $this->last_reply;
+ }
+
+ /**
+ * Read the SMTP server's response.
+ * Either before eof or socket timeout occurs on the operation.
+ * With SMTP we can tell if we have more lines to read if the
+ * 4th character is '-' symbol. If it is a space then we don't
+ * need to read anything else.
+ *
+ * @return string
+ */
+ protected function get_lines()
+ {
+ //If the connection is bad, give up straight away
+ if (!is_resource($this->smtp_conn)) {
+ return '';
+ }
+ $data = '';
+ $endtime = 0;
+ stream_set_timeout($this->smtp_conn, $this->Timeout);
+ if ($this->Timelimit > 0) {
+ $endtime = time() + $this->Timelimit;
+ }
+ $selR = [$this->smtp_conn];
+ $selW = null;
+ while (is_resource($this->smtp_conn) && !feof($this->smtp_conn)) {
+ //Must pass vars in here as params are by reference
+ //solution for signals inspired by https://github.com/symfony/symfony/pull/6540
+ set_error_handler([$this, 'errorHandler']);
+ $n = stream_select($selR, $selW, $selW, $this->Timelimit);
+ restore_error_handler();
+
+ if ($n === false) {
+ $message = $this->getError()['detail'];
+
+ $this->edebug(
+ 'SMTP -> get_lines(): select failed (' . $message . ')',
+ self::DEBUG_LOWLEVEL
+ );
+
+ //stream_select returns false when the `select` system call is interrupted
+ //by an incoming signal, try the select again
+ if (stripos($message, 'interrupted system call') !== false) {
+ $this->edebug(
+ 'SMTP -> get_lines(): retrying stream_select',
+ self::DEBUG_LOWLEVEL
+ );
+ $this->setError('');
+ continue;
+ }
+
+ break;
+ }
+
+ if (!$n) {
+ $this->edebug(
+ 'SMTP -> get_lines(): select timed-out in (' . $this->Timelimit . ' sec)',
+ self::DEBUG_LOWLEVEL
+ );
+ break;
+ }
+
+ //Deliberate noise suppression - errors are handled afterwards
+ $str = @fgets($this->smtp_conn, self::MAX_REPLY_LENGTH);
+ $this->edebug('SMTP INBOUND: "' . trim($str) . '"', self::DEBUG_LOWLEVEL);
+ $data .= $str;
+ //If response is only 3 chars (not valid, but RFC5321 S4.2 says it must be handled),
+ //or 4th character is a space or a line break char, we are done reading, break the loop.
+ //String array access is a significant micro-optimisation over strlen
+ if (!isset($str[3]) || $str[3] === ' ' || $str[3] === "\r" || $str[3] === "\n") {
+ break;
+ }
+ //Timed-out? Log and break
+ $info = stream_get_meta_data($this->smtp_conn);
+ if ($info['timed_out']) {
+ $this->edebug(
+ 'SMTP -> get_lines(): stream timed-out (' . $this->Timeout . ' sec)',
+ self::DEBUG_LOWLEVEL
+ );
+ break;
+ }
+ //Now check if reads took too long
+ if ($endtime && time() > $endtime) {
+ $this->edebug(
+ 'SMTP -> get_lines(): timelimit reached (' .
+ $this->Timelimit . ' sec)',
+ self::DEBUG_LOWLEVEL
+ );
+ break;
+ }
+ }
+
+ return $data;
+ }
+
+ /**
+ * Enable or disable VERP address generation.
+ *
+ * @param bool $enabled
+ */
+ public function setVerp($enabled = false)
+ {
+ $this->do_verp = $enabled;
+ }
+
+ /**
+ * Get VERP address generation mode.
+ *
+ * @return bool
+ */
+ public function getVerp()
+ {
+ return $this->do_verp;
+ }
+
+ /**
+ * Set error messages and codes.
+ *
+ * @param string $message The error message
+ * @param string $detail Further detail on the error
+ * @param string $smtp_code An associated SMTP error code
+ * @param string $smtp_code_ex Extended SMTP code
+ */
+ protected function setError($message, $detail = '', $smtp_code = '', $smtp_code_ex = '')
+ {
+ $this->error = [
+ 'error' => $message,
+ 'detail' => $detail,
+ 'smtp_code' => $smtp_code,
+ 'smtp_code_ex' => $smtp_code_ex,
+ ];
+ }
+
+ /**
+ * Set debug output method.
+ *
+ * @param string|callable $method The name of the mechanism to use for debugging output, or a callable to handle it
+ */
+ public function setDebugOutput($method = 'echo')
+ {
+ $this->Debugoutput = $method;
+ }
+
+ /**
+ * Get debug output method.
+ *
+ * @return string
+ */
+ public function getDebugOutput()
+ {
+ return $this->Debugoutput;
+ }
+
+ /**
+ * Set debug output level.
+ *
+ * @param int $level
+ */
+ public function setDebugLevel($level = 0)
+ {
+ $this->do_debug = $level;
+ }
+
+ /**
+ * Get debug output level.
+ *
+ * @return int
+ */
+ public function getDebugLevel()
+ {
+ return $this->do_debug;
+ }
+
+ /**
+ * Set SMTP timeout.
+ *
+ * @param int $timeout The timeout duration in seconds
+ */
+ public function setTimeout($timeout = 0)
+ {
+ $this->Timeout = $timeout;
+ }
+
+ /**
+ * Get SMTP timeout.
+ *
+ * @return int
+ */
+ public function getTimeout()
+ {
+ return $this->Timeout;
+ }
+
+ /**
+ * Reports an error number and string.
+ *
+ * @param int $errno The error number returned by PHP
+ * @param string $errmsg The error message returned by PHP
+ * @param string $errfile The file the error occurred in
+ * @param int $errline The line number the error occurred on
+ */
+ protected function errorHandler($errno, $errmsg, $errfile = '', $errline = 0)
+ {
+ $notice = 'Connection failed.';
+ $this->setError(
+ $notice,
+ $errmsg,
+ (string) $errno
+ );
+ $this->edebug(
+ "$notice Error #$errno: $errmsg [$errfile line $errline]",
+ self::DEBUG_CONNECTION
+ );
+ }
+
+ /**
+ * Extract and return the ID of the last SMTP transaction based on
+ * a list of patterns provided in SMTP::$smtp_transaction_id_patterns.
+ * Relies on the host providing the ID in response to a DATA command.
+ * If no reply has been received yet, it will return null.
+ * If no pattern was matched, it will return false.
+ *
+ * @return bool|string|null
+ */
+ protected function recordLastTransactionID()
+ {
+ $reply = $this->getLastReply();
+
+ if (empty($reply)) {
+ $this->last_smtp_transaction_id = null;
+ } else {
+ $this->last_smtp_transaction_id = false;
+ foreach ($this->smtp_transaction_id_patterns as $smtp_transaction_id_pattern) {
+ $matches = [];
+ if (preg_match($smtp_transaction_id_pattern, $reply, $matches)) {
+ $this->last_smtp_transaction_id = trim($matches[1]);
+ break;
+ }
+ }
+ }
+
+ return $this->last_smtp_transaction_id;
+ }
+
+ /**
+ * Get the queue/transaction ID of the last SMTP transaction
+ * If no reply has been received yet, it will return null.
+ * If no pattern was matched, it will return false.
+ *
+ * @return bool|string|null
+ *
+ * @see recordLastTransactionID()
+ */
+ public function getLastTransactionID()
+ {
+ return $this->last_smtp_transaction_id;
+ }
+}