File: /home/region-gk.ru/data/www/region-gk.ru/wp-content/themes/region/mail/phpmailer/SMTP.php
<?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 = '6.5.0';
/**
* 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 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 \((.*)\)/',
];
/**
* 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
);
restore_error_handler();
} 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().
*
* @param string $username The user name
* @param string $password The password
* @param string $authtype The auth type (CRAM-MD5, PLAIN, LOGIN, XOAUTH2)
* @param OAuth $OAuth An optional OAuth instance for XOAUTH2 authentication
*
* @return bool True if successfully authenticated
* @see hello()
*
*/
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->setError( '' );
$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,
* finializing the mail transaction. $msg_data is the message
* that is to be send 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;
}
$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;
}
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;
}
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;
}
}