1 <?php
2 /**
3  * PHPMailer RFC821 SMTP email transport
class.
4  * PHP Version
5
5  * @package PHPMailer
6  * @link https://github.com/PHPMailer/PHPMailer/ The PHPMailer GitHub project
7  * @author Marcus Bointon (Synchro/coolbru) <phpmailer@synchromedia.co.uk>
8  * @author Jim Jagielski (jimjag) <jimjag@gmail.com>
9  * @author Andy Prevost (codeworxtech) <codeworxtech@users.sourceforge.net>
10  * @author Brent R. Matzelle (original founder)
11  * @copyright
2014 Marcus Bointon
12  * @copyright
2010 - 2012 Jim Jagielski
13  * @copyright
2004 - 2009 Andy Prevost
14  * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
15  * @note This program
is distributed in the hope that it will be useful - WITHOUT
16  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
17  * FITNESS FOR A PARTICULAR PURPOSE.
18  */
19
20 /**
21  * PHPMailer RFC821 SMTP email transport
class.
22  * Implements RFC
821 SMTP commands and provides some utility methods for sending mail to an SMTP server.
23  * @package PHPMailer
24  * @author Chris Ryan
25  * @author Marcus Bointon <phpmailer@synchromedia.co.uk>
26  */

27 class
SMTP
28 {
29     
/**
30      * The PHPMailer SMTP version number.
31      * @type
string
32      */

33     
const VERSION = '5.2.9';
34
35     
/**
36      * SMTP line
break constant.
37      * @type
string
38      */

39     
const CRLF = "\r\n";
40
41     
/**
42      * The SMTP port to use
if one is not specified.
43      * @type integer
44      */

45     
const DEFAULT_SMTP_PORT = 25;
46
47     
/**
48      * The maximum line length allowed
by RFC 2822 section 2.1.1
49      * @type integer
50      */

51     
const MAX_LINE_LENGTH = 998;
52
53     
/**
54      * Debug level
for no output
55      */

56     
const DEBUG_OFF = 0;
57
58     
/**
59      * Debug level to show client -> server messages
60      */

61     
const DEBUG_CLIENT = 1;
62
63     
/**
64      * Debug level to show client -> server and server -> client messages
65      */

66     
const DEBUG_SERVER = 2;
67
68     
/**
69      * Debug level to show connection status, client -> server and server -> client messages
70      */

71     
const DEBUG_CONNECTION = 3;
72
73     
/**
74      * Debug level to show all messages
75      */

76     
const DEBUG_LOWLEVEL = 4;
77
78     
/**
79      * The PHPMailer SMTP Version number.
80      * @type
string
81      * @deprecated Use the `VERSION` constant instead
82      * @see SMTP::VERSION
83      */

84     
public $Version = '5.2.9';
85
86     
/**
87      * SMTP server port number.
88      * @type integer
89      * @deprecated This
is only ever used as a default value, so use the `DEFAULT_SMTP_PORT` constant instead
90      * @see SMTP::DEFAULT_SMTP_PORT
91      */

92     
public $SMTP_PORT = 25;
93
94     
/**
95      * SMTP reply line ending.
96      * @type
string
97      * @deprecated Use the `CRLF` constant instead
98      * @see SMTP::CRLF
99      */

100     
public $CRLF = "\r\n";
101
102     
/**
103      * Debug output level.
104      * Options:
105      * * self::DEBUG_OFF (`
0`) No debug output, default
106      * * self::DEBUG_CLIENT (`
1`) Client commands
107      * * self::DEBUG_SERVER (`
2`) Client commands and server responses
108      * * self::DEBUG_CONNECTION (`
3`) As DEBUG_SERVER plus connection status
109      * * self::DEBUG_LOWLEVEL (`
4`) Low-level data output, all messages
110      * @type integer
111      */

112     
public $do_debug = self::DEBUG_OFF;
113
114     
/**
115      * How to handle debug output.
116      * Options:
117      * * `echo` Output plain-text
as-is, appropriate for CLI
118      * * `html` Output escaped, line breaks converted to `<br>`, appropriate
for browser output
119      * * `error_log` Output to error log
as configured in php.ini
120      *
121      * Alternatively, you can provide a callable expecting two
params: a message string and the debug level:
122      * <code>
123      * $smtp->Debugoutput = function($str, $level) {echo
"debug level $level; message: $str";};
124      * </code>
125      * @type
string|callable
126      */

127     
public $Debugoutput = 'echo';
128
129     
/**
130      * Whether to use VERP.
131      * @link http://en.wikipedia.org/wiki/Variable_envelope_return_path
132      * @link http://www.postfix.org/VERP_README.html Info
on VERP
133      * @type boolean
134      */

135     
public $do_verp = false;
136
137     
/**
138      * The timeout
value for connection, in seconds.
139      * Default of
5 minutes (300sec) is from RFC2821 section 4.5.3.2
140      * This needs to be quite high to function correctly with hosts
using greetdelay as an anti-spam measure.
141      * @link http://tools.ietf.org/html/rfc2821#section-
4.5.3.2
142      * @type integer
143      */

144     
public $Timeout = 300;
145
146     
/**
147      * How
long to wait for commands to complete, in seconds.
148      * Default of
5 minutes (300sec) is from RFC2821 section 4.5.3.2
149      * @type integer
150      */

151     
public $Timelimit = 300;
152
153     
/**
154      * The socket
for the server connection.
155      * @type resource
156      */

157     
protected $smtp_conn;
158
159     
/**
160      * Error message,
if any, for the last call.
161      * @type array
162      */

163     
protected $error = array();
164
165     
/**
166      * The reply the server sent to us
for HELO.
167      * If
null, no HELO string has yet been received.
168      * @type
string|null
169      */

170     
protected $helo_rply = null;
171
172     
/**
173      * The
set of SMTP extensions sent in reply to EHLO command.
174      * Indexes of the array are extension names.
175      * Value at index
'HELO' or 'EHLO' (according to command that was sent)
176      * represents the server name. In
case of HELO it is the only element of the array.
177      * Other values can be boolean TRUE or an array containing extension options.
178      * If
null, no HELO/EHLO string has yet been received.
179      * @type array|
null
180      */

181     
protected $server_caps = null;
182
183     
/**
184      * The most recent reply received
from the server.
185      * @type
string
186      */

187     
protected $last_reply = '';
188
189     
/**
190      * Output debugging info via a user-selected method.
191      * @see SMTP::$Debugoutput
192      * @see SMTP::$do_debug
193      * @param
string $str Debug string to output
194      * @param integer $level The debug level of
this message; see DEBUG_* constants
195      * @
return void
196      */

197     
protected function edebug($str, $level = 0)
198     {
199         
if ($level > $this->do_debug) {
200             
return;
201         }
202         
//Avoid clash with built-in function names
203         
if (!in_array($this->Debugoutput, array('error_log', 'html', 'echo')) and is_callable($this->Debugoutput)) {
204             call_user_func($
this->Debugoutput, $str, $this->do_debug);
205             
return;
206         }
207         
switch ($this->Debugoutput) {
208             
case 'error_log':
209                 
//Don't output, just log
210                 error_log($str);
211                 
break;
212             
case 'html':
213                 
//Cleans up output a bit for a better looking, HTML-safe output
214                 echo htmlentities(
215                     preg_replace(
'/[\r\n]+/', '', $str),
216                     ENT_QUOTES,
217                     
'UTF-8'
218                 )
219                 .
"<br>\n";
220                 
break;
221             
case 'echo':
222             
default:
223                 
//Normalize line breaks
224                 $str = preg_replace(
'/(\r\n|\r|\n)/ms', "\n", $str);
225                 echo gmdate(
'Y-m-d H:i:s') . "\t" . str_replace(
226                     
"\n",
227                     
"\n \t ",
228                     trim($str)
229                 ).
"\n";
230         }
231     }
232
233     
/**
234      * Connect to an SMTP server.
235      * @param
string $host SMTP server IP or host name
236      * @param integer $port The port number to connect to
237      * @param integer $timeout How
long to wait for the connection to open
238      * @param array $options An array of options
for stream_context_create()
239      * @access
public
240      * @
return boolean
241      */

242     
public function connect($host, $port = null, $timeout = 30, $options = array())
243     {
244         
static $streamok;
245         
//This is enabled by default since 5.0.0 but some providers disable it
246         
//Check this once and cache the result
247         
if (is_null($streamok)) {
248             $streamok = function_exists(
'stream_socket_client');
249         }
250         
// Clear errors to avoid confusion
251         $
this->error = array();
252         
// Make sure we are __not__ connected
253         
if ($this->connected()) {
254             
// Already connected, generate error
255             $
this->error = array('error' => 'Already connected to a server');
256             
return false;
257         }
258         
if (empty($port)) {
259             $port = self::DEFAULT_SMTP_PORT;
260         }
261         
// Connect to the SMTP server
262         $
this->edebug(
263             
"Connection: opening to $host:$port, t=$timeout, opt=".var_export($options, true),
264             self::DEBUG_CONNECTION
265         );
266         $errno =
0;
267         $errstr =
'';
268         
if ($streamok) {
269             $socket_context = stream_context_create($options);
270             
//Suppress errors; connection failures are handled at a higher level
271             $
this->smtp_conn = @stream_socket_client(
272                 $host .
":" . $port,
273                 $errno,
274                 $errstr,
275                 $timeout,
276                 STREAM_CLIENT_CONNECT,
277                 $socket_context
278             );
279         }
else {
280             
//Fall back to fsockopen which should work in more places, but is missing some features
281             $
this->edebug(
282                 
"Connection: stream_socket_client not available, falling back to fsockopen",
283                 self::DEBUG_CONNECTION
284             );
285             $
this->smtp_conn = fsockopen(
286                 $host,
287                 $port,
288                 $errno,
289                 $errstr,
290                 $timeout
291             );
292         }
293         
// Verify we connected properly
294         
if (!is_resource($this->smtp_conn)) {
295             $
this->error = array(
296                 
'error' => 'Failed to connect to server',
297                 
'errno' => $errno,
298                 
'errstr' => $errstr
299             );
300             $
this->edebug(
301                 
'SMTP ERROR: ' . $this->error['error']
302                 .
": $errstr ($errno)",
303                 self::DEBUG_CLIENT
304             );
305             
return false;
306         }
307         $
this->edebug('Connection: opened', self::DEBUG_CONNECTION);
308         
// SMTP server can take longer to respond, give longer timeout for first read
309         
// Windows does not have support for this timeout function
310         
if (substr(PHP_OS, 0, 3) != 'WIN') {
311             $max = ini_get(
'max_execution_time');
312             
if ($max != 0 && $timeout > $max) { // Don't bother if unlimited
313                 @set_time_limit($timeout);
314             }
315             stream_set_timeout($
this->smtp_conn, $timeout, 0);
316         }
317         
// Get any announcement
318         $announce = $
this->get_lines();
319         $
this->edebug('SERVER -> CLIENT: ' . $announce, self::DEBUG_SERVER);
320         
return true;
321     }
322
323     
/**
324      * Initiate a TLS (encrypted) session.
325      * @access
public
326      * @
return boolean
327      */

328     
public function startTLS()
329     {
330         
if (!$this->sendCommand('STARTTLS', 'STARTTLS', 220)) {
331             
return false;
332         }
333         
// Begin encrypted connection
334         
if (!stream_socket_enable_crypto(
335             $
this->smtp_conn,
336             
true,
337             STREAM_CRYPTO_METHOD_TLS_CLIENT
338         )) {
339             
return false;
340         }
341         
return true;
342     }
343
344     
/**
345      * Perform SMTP authentication.
346      * Must be run after hello().
347      * @see hello()
348      * @param
string $username The user name
349      * @param
string $password The password
350      * @param
string $authtype The auth type (PLAIN, LOGIN, NTLM, CRAM-MD5)
351      * @param
string $realm The auth realm for NTLM
352      * @param
string $workstation The auth workstation for NTLM
353      * @access
public
354      * @
return boolean True if successfully authenticated.
355      */

356     
public function authenticate(
357         $username,
358         $password,
359         $authtype =
null,
360         $realm =
'',
361         $workstation =
''
362     ) {
363         
if (!$this->server_caps) {
364             $
this->error = array('error' => 'Authentication is not allowed before HELO/EHLO');
365             
return false;
366         }
367
368         
if (array_key_exists('EHLO', $this->server_caps)) {
369         
// SMTP extensions are available. Let's try to find a proper authentication method
370
371             
if (!array_key_exists('AUTH', $this->server_caps)) {
372                 $
this->error = array( 'error' => 'Authentication is not allowed at this stage' );
373                 
// 'at this stage' means that auth may be allowed after the stage changes
374                 
// e.g. after STARTTLS
375                 
return false;
376             }
377
378             self::edebug(
'Auth method requested: ' . ($authtype ? $authtype : 'UNKNOWN'), self::DEBUG_LOWLEVEL);
379             self::edebug(
380                 
'Auth methods available on the server: ' . implode(',', $this->server_caps['AUTH']),
381                 self::DEBUG_LOWLEVEL
382             );
383
384             
if (empty($authtype)) {
385                 
foreach (array('LOGIN', 'CRAM-MD5', 'NTLM', 'PLAIN') as $method) {
386                     
if (in_array($method, $this->server_caps['AUTH'])) {
387                         $authtype = $method;
388                         
break;
389                     }
390                 }
391                 
if (empty($authtype)) {
392                     $
this->error = array( 'error' => 'No supported authentication methods found' );
393                     
return false;
394                 }
395                 self::edebug(
'Auth method selected: '.$authtype, self::DEBUG_LOWLEVEL);
396             }
397
398             
if (!in_array($authtype, $this->server_caps['AUTH'])) {
399                 $
this->error = array( 'error' => 'The requested authentication method "'
400                     . $authtype .
'" is not supported by the server' );
401                 
return false;
402             }
403         } elseif (empty($authtype)) {
404             $authtype =
'LOGIN';
405         }
406         
switch ($authtype) {
407             
case 'PLAIN':
408                 
// Start authentication
409                 
if (!$this->sendCommand('AUTH', 'AUTH PLAIN', 334)) {
410                     
return false;
411                 }
412                 
// Send encoded username and password
413                 
if (!$this->sendCommand(
414                     
'User & Password',
415                     base64_encode(
"\0" . $username . "\0" . $password),
416                     
235
417                 )
418                 ) {
419                     
return false;
420                 }
421                 
break;
422             
case 'LOGIN':
423                 
// Start authentication
424                 
if (!$this->sendCommand('AUTH', 'AUTH LOGIN', 334)) {
425                     
return false;
426                 }
427                 
if (!$this->sendCommand("Username", base64_encode($username), 334)) {
428                     
return false;
429                 }
430                 
if (!$this->sendCommand("Password", base64_encode($password), 235)) {
431                     
return false;
432                 }
433                 
break;
434             
case 'NTLM':
435                 
/*
436                  * ntlm_sasl_client.php
437                  * Bundled with Permission
438                  *
439                  * How to telnet
in windows:
440                  * http://technet.microsoft.com/en-us/library/aa995718%28EXCHG.
65%29.aspx
441                  * PROTOCOL Docs http://curl.haxx.se/rfc/ntlm.html#ntlmSmtpAuthentication
442                  */

443                 require_once
'extras/ntlm_sasl_client.php';
444                 $temp =
new stdClass();
445                 $ntlm_client =
new ntlm_sasl_client_class;
446                 
//Check that functions are available
447                 
if (!$ntlm_client->Initialize($temp)) {
448                     $
this->error = array('error' => $temp->error);
449                     $
this->edebug(
450                         
'You need to enable some modules in your php.ini file: '
451                         . $
this->error['error'],
452                         self::DEBUG_CLIENT
453                     );
454                     
return false;
455                 }
456                 
//msg1
457                 $msg1 = $ntlm_client->TypeMsg1($realm, $workstation);
//msg1
458
459                 
if (!$this->sendCommand(
460                     
'AUTH NTLM',
461                     
'AUTH NTLM ' . base64_encode($msg1),
462                     
334
463                 )
464                 ) {
465                     
return false;
466                 }
467                 
//Though 0 based, there is a white space after the 3 digit number
468                 
//msg2
469                 $challenge = substr($
this->last_reply, 3);
470                 $challenge = base64_decode($challenge);
471                 $ntlm_res = $ntlm_client->NTLMResponse(
472                     substr($challenge,
24, 8),
473                     $password
474                 );
475                 
//msg3
476                 $msg3 = $ntlm_client->TypeMsg3(
477                     $ntlm_res,
478                     $username,
479                     $realm,
480                     $workstation
481                 );
482                 
// send encoded username
483                 
return $this->sendCommand('Username', base64_encode($msg3), 235);
484             
case 'CRAM-MD5':
485                 
// Start authentication
486                 
if (!$this->sendCommand('AUTH CRAM-MD5', 'AUTH CRAM-MD5', 334)) {
487                     
return false;
488                 }
489                 
// Get the challenge
490                 $challenge = base64_decode(substr($
this->last_reply, 4));
491
492                 
// Build the response
493                 $response = $username .
' ' . $this->hmac($challenge, $password);
494
495                 
// send encoded credentials
496                 
return $this->sendCommand('Username', base64_encode($response), 235);
497             
default:
498                 $
this->error = array( 'error' => 'Authentication method "' . $authtype . '" is not supported' );
499                 
return false;
500         }
501         
return true;
502     }
503
504     
/**
505      * Calculate an MD5 HMAC hash.
506      * Works like hash_hmac(
'md5', $data, $key)
507      *
in case that function is not available
508      * @param
string $data The data to hash
509      * @param
string $key The key to hash with
510      * @access
protected
511      * @
return string
512      */

513     
protected function hmac($data, $key)
514     {
515         
if (function_exists('hash_hmac')) {
516             
return hash_hmac('md5', $data, $key);
517         }
518
519         
// The following borrowed from
520         
// http://php.net/manual/en/function.mhash.php#27225
521
522         
// RFC 2104 HMAC implementation for php.
523         
// Creates an md5 HMAC.
524         
// Eliminates the need to install mhash to compute a HMAC
525         
// by Lance Rushing
526
527         $bytelen =
64; // byte length for md5
528         
if (strlen($key) > $bytelen) {
529             $key = pack(
'H*', md5($key));
530         }
531         $key = str_pad($key, $bytelen, chr(
0x00));
532         $ipad = str_pad(
'', $bytelen, chr(0x36));
533         $opad = str_pad(
'', $bytelen, chr(0x5c));
534         $k_ipad = $key ^ $ipad;
535         $k_opad = $key ^ $opad;
536
537         
return md5($k_opad . pack('H*', md5($k_ipad . $data)));
538     }
539
540     
/**
541      * Check connection state.
542      * @access
public
543      * @
return boolean True if connected.
544      */

545     
public function connected()
546     {
547         
if (is_resource($this->smtp_conn)) {
548             $sock_status = stream_get_meta_data($
this->smtp_conn);
549             
if ($sock_status['eof']) {
550                 
// The socket is valid but we are not connected
551                 $
this->edebug(
552                     
'SMTP NOTICE: EOF caught while checking if connected',
553                     self::DEBUG_CLIENT
554                 );
555                 $
this->close();
556                 
return false;
557             }
558             
return true; // everything looks good
559         }
560         
return false;
561     }
562
563     
/**
564      * Close the socket and clean up the state of the
class.
565      * Don
't use this function without first trying to use QUIT.
566      * @see quit()
567      * @access
public
568      * @
return void
569      */

570     
public function close()
571     {
572         $
this->error = array();
573         $
this->server_caps = null;
574         $
this->helo_rply = null;
575         
if (is_resource($this->smtp_conn)) {
576             
// close the connection and cleanup
577             fclose($
this->smtp_conn);
578             $
this->smtp_conn = null; //Makes for cleaner serialization
579             $
this->edebug('Connection: closed', self::DEBUG_CONNECTION);
580         }
581     }
582
583     
/**
584      * Send an SMTP DATA command.
585      * Issues a data command and sends the msg_data to the server,
586      * finializing the mail transaction. $msg_data
is the message
587      * that
is to be send with the headers. Each header needs to be
588      *
on a single line followed by a <CRLF> with the message headers
589      * and the message body being separated
by and additional <CRLF>.
590      * Implements rfc
821: DATA <CRLF>
591      * @param
string $msg_data Message data to send
592      * @access
public
593      * @
return boolean
594      */

595     
public function data($msg_data)
596     {
597         
//This will use the standard timelimit
598         
if (!$this->sendCommand('DATA', 'DATA', 354)) {
599             
return false;
600         }
601
602         
/* The server is ready to accept data!
603          * According to rfc821 we should not send more than
1000 characters on a single line (including the CRLF)
604          * so we will
break the data up into lines by \r and/or \n then if needed we will break each of those into
605          * smaller lines to fit within the limit.
606          * We will also look
for lines that start with a '.' and prepend an additional '.'.
607          * NOTE:
this does not count towards line-length limit.
608          */

609
610         
// Normalize line breaks before exploding
611         $lines = explode(
"\n", str_replace(array("\r\n", "\r"), "\n", $msg_data));
612
613         
/* To distinguish between a complete RFC822 message and a plain message body, we check if the first field
614          * of the first line (
':' separated) does not contain a space then it _should_ be a header and we will
615          * process all lines before a blank line
as headers.
616          */

617
618         $field = substr($lines[
0], 0, strpos($lines[0], ':'));
619         $in_headers =
false;
620         
if (!empty($field) && strpos($field, ' ') === false) {
621             $in_headers =
true;
622         }
623
624         
foreach ($lines as $line) {
625             $lines_out = array();
626             
if ($in_headers and $line == '') {
627                 $in_headers =
false;
628             }
629             
//We need to break this line up into several smaller lines
630             
//This is a small micro-optimisation: isset($str[$len]) is equivalent to (strlen($str) > $len)
631             
while (isset($line[self::MAX_LINE_LENGTH])) {
632                 
//Working backwards, try to find a space within the last MAX_LINE_LENGTH chars of the line to break on
633                 
//so as to avoid breaking in the middle of a word
634                 $pos = strrpos(substr($line,
0, self::MAX_LINE_LENGTH), ' ');
635                 
if (!$pos) { //Deliberately matches both false and 0
636                     
//No nice break found, add a hard break
637                     $pos = self::MAX_LINE_LENGTH -
1;
638                     $lines_out[] = substr($line,
0, $pos);
639                     $line = substr($line, $pos);
640                 }
else {
641                     
//Break at the found point
642                     $lines_out[] = substr($line,
0, $pos);
643                     
//Move along by the amount we dealt with
644                     $line = substr($line, $pos +
1);
645                 }
646                 
//If processing headers add a LWSP-char to the front of new line RFC822 section 3.1.1
647                 
if ($in_headers) {
648                     $line =
"\t" . $line;
649                 }
650             }
651             $lines_out[] = $line;
652
653             
//Send the lines to the server
654             
foreach ($lines_out as $line_out) {
655                 
//RFC2821 section 4.5.2
656                 
if (!empty($line_out) and $line_out[0] == '.') {
657                     $line_out =
'.' . $line_out;
658                 }
659                 $
this->client_send($line_out . self::CRLF);
660             }
661         }
662
663         
//Message data has been sent, complete the command
664         
//Increase timelimit for end of DATA command
665         $savetimelimit = $
this->Timelimit;
666         $
this->Timelimit = $this->Timelimit * 2;
667         $result = $
this->sendCommand('DATA END', '.', 250);
668         
//Restore timelimit
669         $
this->Timelimit = $savetimelimit;
670         
return $result;
671     }
672
673     
/**
674      * Send an SMTP HELO or EHLO command.
675      * Used to identify the sending server to the receiving server.
676      * This makes sure that client and server are
in a known state.
677      * Implements RFC
821: HELO <SP> <domain> <CRLF>
678      * and RFC
2821 EHLO.
679      * @param
string $host The host name or IP to connect to
680      * @access
public
681      * @
return boolean
682      */

683     
public function hello($host = '')
684     {
685         
//Try extended hello first (RFC 2821)
686         
return (boolean)($this->sendHello('EHLO', $host) or $this->sendHello('HELO', $host));
687     }
688
689     
/**
690      * Send an SMTP HELO or EHLO command.
691      * Low-level implementation used
by hello()
692      * @see hello()
693      * @param
string $hello The HELO string
694      * @param
string $host The hostname to say we are
695      * @access
protected
696      * @
return boolean
697      */

698     
protected function sendHello($hello, $host)
699     {
700         $noerror = $
this->sendCommand($hello, $hello . ' ' . $host, 250);
701         $
this->helo_rply = $this->last_reply;
702         
if ($noerror) {
703             $
this->parseHelloFields($hello);
704         }
else {
705             $
this->server_caps = null;
706         }
707         
return $noerror;
708     }
709
710     
/**
711      * Parse a reply to HELO/EHLO command to discover server extensions.
712      * In
case of HELO, the only parameter that can be discovered is a server name.
713      * @access
protected
714      * @param
string $type - 'HELO' or 'EHLO'
715      */

716     
protected function parseHelloFields($type)
717     {
718         $
this->server_caps = array();
719         $lines = explode(
"\n", $this->last_reply);
720         
foreach ($lines as $n => $s) {
721             $s = trim(substr($s,
4));
722             
if (!$s) {
723                 
continue;
724             }
725             $fields = explode(
' ', $s);
726             
if ($fields) {
727                 
if (!$n) {
728                     $name = $type;
729                     $fields = $fields[
0];
730                 }
else {
731                     $name = array_shift($fields);
732                     
if ($name == 'SIZE') {
733                         $fields = ($fields) ? $fields[
0] : 0;
734                     }
735                 }
736                 $
this->server_caps[$name] = ($fields ? $fields : true);
737             }
738         }
739     }
740
741     
/**
742      * Send an SMTP MAIL command.
743      * Starts a mail transaction
from the email address specified in
744      * $
from. Returns true if successful or false otherwise. If True
745      * the mail transaction
is started and then one or more recipient
746      * commands may be called followed
by a data command.
747      * Implements rfc
821: MAIL <SP> FROM:<reverse-path> <CRLF>
748      * @param
string $from Source address of this message
749      * @access
public
750      * @
return boolean
751      */

752     
public function mail($from)
753     {
754         $useVerp = ($
this->do_verp ? ' XVERP' : '');
755         
return $this->sendCommand(
756             
'MAIL FROM',
757             
'MAIL FROM:<' . $from . '>' . $useVerp,
758             
250
759         );
760     }
761
762     
/**
763      * Send an SMTP QUIT command.
764      * Closes the socket
if there is no error or the $close_on_error argument is true.
765      * Implements
from rfc 821: QUIT <CRLF>
766      * @param boolean $close_on_error Should the connection close
if an error occurs?
767      * @access
public
768      * @
return boolean
769      */

770     
public function quit($close_on_error = true)
771     {
772         $noerror = $
this->sendCommand('QUIT', 'QUIT', 221);
773         $err = $
this->error; //Save any error
774         
if ($noerror or $close_on_error) {
775             $
this->close();
776             $
this->error = $err; //Restore any error from the quit command
777         }
778         
return $noerror;
779     }
780
781     
/**
782      * Send an SMTP RCPT command.
783      * Sets the TO argument to $toaddr.
784      * Returns
true if the recipient was accepted false if it was rejected.
785      * Implements
from rfc 821: RCPT <SP> TO:<forward-path> <CRLF>
786      * @param
string $toaddr The address the message is being sent to
787      * @access
public
788      * @
return boolean
789      */

790     
public function recipient($toaddr)
791     {
792         
return $this->sendCommand(
793             
'RCPT TO',
794             
'RCPT TO:<' . $toaddr . '>',
795             array(
250, 251)
796         );
797     }
798
799     
/**
800      * Send an SMTP RSET command.
801      * Abort any transaction that
is currently in progress.
802      * Implements rfc
821: RSET <CRLF>
803      * @access
public
804      * @
return boolean True on success.
805      */

806     
public function reset()
807     {
808         
return $this->sendCommand('RSET', 'RSET', 250);
809     }
810
811     
/**
812      * Send a command to an SMTP server and check its
return code.
813      * @param
string $command The command name - not sent to the server
814      * @param
string $commandstring The actual command to send
815      * @param integer|array $expect One or more expected integer success codes
816      * @access
protected
817      * @
return boolean True on success.
818      */

819     
protected function sendCommand($command, $commandstring, $expect)
820     {
821         
if (!$this->connected()) {
822             $
this->error = array(
823                 
'error' => "Called $command without being connected"
824             );
825             
return false;
826         }
827         $
this->client_send($commandstring . self::CRLF);
828
829         $
this->last_reply = $this->get_lines();
830         
// Fetch SMTP code and possible error code explanation
831         $matches = array();
832         
if (preg_match("/^([0-9]{3})[ -](?:([0-9]\\.[0-9]\\.[0-9]) )?/", $this->last_reply, $matches)) {
833             $code = $matches[
1];
834             $code_ex = (count($matches) >
2 ? $matches[2] : null);
835             
// Cut off error code from each response line
836             $detail = preg_replace(
837                 
"/{$code}[ -]".($code_ex ? str_replace('.', '\\.', $code_ex).' ' : '')."/m",
838                 
'',
839                 $
this->last_reply
840             );
841         }
else { // Fall back to simple parsing if regex fails
842             $code = substr($
this->last_reply, 0, 3);
843             $code_ex =
null;
844             $detail = substr($
this->last_reply, 4);
845         }
846
847         $
this->edebug('SERVER -> CLIENT: ' . $this->last_reply, self::DEBUG_SERVER);
848
849         
if (!in_array($code, (array)$expect)) {
850             $
this->error = array(
851                 
'error' => "$command command failed",
852                 
'smtp_code' => $code,
853                 
'smtp_code_ex' => $code_ex,
854                 
'detail' => $detail
855             );
856             $
this->edebug(
857                 
'SMTP ERROR: ' . $this->error['error'] . ': ' . $this->last_reply,
858                 self::DEBUG_CLIENT
859             );
860             
return false;
861         }
862
863         $
this->error = array();
864         
return true;
865     }
866
867     
/**
868      * Send an SMTP SAML command.
869      * Starts a mail transaction
from the email address specified in $from.
870      * Returns
true if successful or false otherwise. If True
871      * the mail transaction
is started and then one or more recipient
872      * commands may be called followed
by a data command. This command
873      * will send the message to the users terminal
if they are logged
874      *
in and send them an email.
875      * Implements rfc
821: SAML <SP> FROM:<reverse-path> <CRLF>
876      * @param
string $from The address the message is from
877      * @access
public
878      * @
return boolean
879      */

880     
public function sendAndMail($from)
881     {
882         
return $this->sendCommand('SAML', "SAML FROM:$from", 250);
883     }
884
885     
/**
886      * Send an SMTP VRFY command.
887      * @param
string $name The name to verify
888      * @access
public
889      * @
return boolean
890      */

891     
public function verify($name)
892     {
893         
return $this->sendCommand('VRFY', "VRFY $name", array(250, 251));
894     }
895
896     
/**
897      * Send an SMTP NOOP command.
898      * Used to keep keep-alives alive, doesn
't actually do anything
899      * @access
public
900      * @
return boolean
901      */

902     
public function noop()
903     {
904         
return $this->sendCommand('NOOP', 'NOOP', 250);
905     }
906
907     
/**
908      * Send an SMTP TURN command.
909      * This
is an optional command for SMTP that this class does not support.
910      * This method
is here to make the RFC821 Definition complete for this class
911      * and _may_ be implemented
in future
912      * Implements
from rfc 821: TURN <CRLF>
913      * @access
public
914      * @
return boolean
915      */

916     
public function turn()
917     {
918         $
this->error = array(
919             
'error' => 'The SMTP TURN command is not implemented'
920         );
921         $
this->edebug('SMTP NOTICE: ' . $this->error['error'], self::DEBUG_CLIENT);
922         
return false;
923     }
924
925     
/**
926      * Send raw data to the server.
927      * @param
string $data The data to send
928      * @access
public
929      * @
return integer|boolean The number of bytes sent to the server or false on error
930      */

931     
public function client_send($data)
932     {
933         $
this->edebug("CLIENT -> SERVER: $data", self::DEBUG_CLIENT);
934         
return fwrite($this->smtp_conn, $data);
935     }
936
937     
/**
938      * Get the latest error.
939      * @access
public
940      * @
return array
941      */

942     
public function getError()
943     {
944         
return $this->error;
945     }
946
947     
/**
948      * Get SMTP extensions available
on the server
949      * @access
public
950      * @
return array|null
951      */

952     
public function getServerExtList()
953     {
954         
return $this->server_caps;
955     }
956
957     
/**
958      * A multipurpose method
959      * The method works
in three ways, dependent on argument value and current state
960      *
1. HELO/EHLO was not sent - returns null and set up $this->error
961      *
2. HELO was sent
962      * $name =
'HELO': returns server name
963      * $name =
'EHLO': returns boolean false
964      * $name = any
string: returns null and set up $this->error
965      *
3. EHLO was sent
966      * $name =
'HELO'|'EHLO': returns server name
967      * $name = any
string: if extension $name exists, returns boolean True
968      * or its options. Otherwise returns boolean False
969      * In other words, one can use
this method to detect 3 conditions:
970      * -
null returned: handshake was not or we don't know about ext (refer to $this->error)
971      * -
false returned: the requested feature exactly not exists
972      * - positive
value returned: the requested feature exists
973      * @param
string $name Name of SMTP extension or 'HELO'|'EHLO'
974      * @
return mixed
975      */

976     
public function getServerExt($name)
977     {
978         
if (!$this->server_caps) {
979             $
this->error = array('No HELO/EHLO was sent');
980             
return null;
981         }
982
983         
// the tight logic knot ;)
984         
if (!array_key_exists($name, $this->server_caps)) {
985             
if ($name == 'HELO') {
986                 
return $this->server_caps['EHLO'];
987             }
988             
if ($name == 'EHLO' || array_key_exists('EHLO', $this->server_caps)) {
989                 
return false;
990             }
991             $
this->error = array('HELO handshake was used. Client knows nothing about server extensions');
992             
return null;
993         }
994
995         
return $this->server_caps[$name];
996     }
997
998     
/**
999      * Get the last reply
from the server.
1000      * @access
public
1001      * @
return string
1002      */

1003     
public function getLastReply()
1004     {
1005         
return $this->last_reply;
1006     }
1007
1008     
/**
1009      * Read the SMTP server
's response.
1010      * Either before eof or socket timeout occurs
on the operation.
1011      * With SMTP we can tell
if we have more lines to read if the
1012      * 4th character
is '-' symbol. If it is a space then we don't
1013      * need to read anything
else.
1014      * @access
protected
1015      * @
return string
1016      */

1017     
protected function get_lines()
1018     {
1019         
// If the connection is bad, give up straight away
1020         
if (!is_resource($this->smtp_conn)) {
1021             
return '';
1022         }
1023         $data =
'';
1024         $endtime =
0;
1025         stream_set_timeout($
this->smtp_conn, $this->Timeout);
1026         
if ($this->Timelimit > 0) {
1027             $endtime = time() + $
this->Timelimit;
1028         }
1029         
while (is_resource($this->smtp_conn) && !feof($this->smtp_conn)) {
1030             $str = @fgets($
this->smtp_conn, 515);
1031             $
this->edebug("SMTP -> get_lines(): \$data was \"$data\"", self::DEBUG_LOWLEVEL);
1032             $
this->edebug("SMTP -> get_lines(): \$str is \"$str\"", self::DEBUG_LOWLEVEL);
1033             $data .= $str;
1034             $
this->edebug("SMTP -> get_lines(): \$data is \"$data\"", self::DEBUG_LOWLEVEL);
1035             
// If 4th character is a space, we are done reading, break the loop, micro-optimisation over strlen
1036             
if ((isset($str[3]) and $str[3] == ' ')) {
1037                 
break;
1038             }
1039             
// Timed-out? Log and break
1040             $info = stream_get_meta_data($
this->smtp_conn);
1041             
if ($info['timed_out']) {
1042                 $
this->edebug(
1043                     
'SMTP -> get_lines(): timed-out (' . $this->Timeout . ' sec)',
1044                     self::DEBUG_LOWLEVEL
1045                 );
1046                 
break;
1047             }
1048             
// Now check if reads took too long
1049             
if ($endtime and time() > $endtime) {
1050                 $
this->edebug(
1051                     
'SMTP -> get_lines(): timelimit reached ('.
1052                     $
this->Timelimit . ' sec)',
1053                     self::DEBUG_LOWLEVEL
1054                 );
1055                 
break;
1056             }
1057         }
1058         
return $data;
1059     }
1060
1061     
/**
1062      * Enable or disable VERP address generation.
1063      * @param boolean $enabled
1064      */

1065     
public function setVerp($enabled = false)
1066     {
1067         $
this->do_verp = $enabled;
1068     }
1069
1070     
/**
1071      * Get VERP address generation mode.
1072      * @
return boolean
1073      */

1074     
public function getVerp()
1075     {
1076         
return $this->do_verp;
1077     }
1078
1079     
/**
1080      * Set debug output method.
1081      * @param
string|callable $method The name of the mechanism to use for debugging output, or a callable to handle it.
1082      */

1083     
public function setDebugOutput($method = 'echo')
1084     {
1085         $
this->Debugoutput = $method;
1086     }
1087
1088     
/**
1089      * Get debug output method.
1090      * @
return string
1091      */

1092     
public function getDebugOutput()
1093     {
1094         
return $this->Debugoutput;
1095     }
1096
1097     
/**
1098      * Set debug output level.
1099      * @param integer $level
1100      */

1101     
public function setDebugLevel($level = 0)
1102     {
1103         $
this->do_debug = $level;
1104     }
1105
1106     
/**
1107      * Get debug output level.
1108      * @
return integer
1109      */

1110     
public function getDebugLevel()
1111     {
1112         
return $this->do_debug;
1113     }
1114
1115     
/**
1116      * Set SMTP timeout.
1117      * @param integer $timeout
1118      */

1119     
public function setTimeout($timeout = 0)
1120     {
1121         $
this->Timeout = $timeout;
1122     }
1123
1124     
/**
1125      * Get SMTP timeout.
1126      * @
return integer
1127      */

1128     
public function getTimeout()
1129     {
1130         
return $this->Timeout;
1131     }
1132 }


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