functions/imap_general.php

   1 <?php
   2
   3 /**
   4  * imap_general.php
   5  *
   6  * Copyright (c) 1999-2003 The SquirrelMail Project Team
   7  * Licensed under the GNU GPL. For full terms see the file COPYING.
   8  *
   9  * This implements all functions that do general imap functions.
  10  *
  11  * $Id$
  12  */
  13
  14 require_once(SM_PATH . 'functions/page_header.php');
  15 require_once(SM_PATH . 'functions/auth.php');
  16
  17
  18 global $sqimap_session_id;
  19 $sqimap_session_id = 1;
  20
  21 /* Sets an unique session id in order to avoid simultanous sessions crash. */
  22 function sqimap_session_id($unique_id = false) {
  23     global $data_dir, $username, $sqimap_session_id;
  24     if (!$unique_id) {
  25         return( sprintf("A%03d", $sqimap_session_id++) );
  26     } else {
  27         return( sprintf("A%03d", $sqimap_session_id++) . ' UID' );
  28     }
  29 }
  30
  31 /*
  32  * Both send a command and accept the result from the command.
  33  * This is to allow proper session number handling.
  34  */
  35 function sqimap_run_command_list ($imap_stream, $query, $handle_errors, &$response, &$message, $unique_id = false) {
  36     if ($imap_stream) {
  37         $sid = sqimap_session_id($unique_id);
  38         fputs ($imap_stream, $sid . ' ' . $query . "\r\n");
  39         $read = sqimap_read_data_list ($imap_stream, $sid, $handle_errors, $response, $message, $query );
  40         return $read;
  41     } else {
  42         global $squirrelmail_language, $color;
  43         set_up_language($squirrelmail_language);
  44         require_once(SM_PATH . 'functions/display_messages.php');
  45         $string = "<b><font color=$color[2]>\n" .
  46                 _("ERROR : No available imapstream.") .
  47                 "</b></font>\n";
  48         error_box($string,$color);
  49         return false;
  50     }
  51
  52 }
  53
  54 function sqimap_run_command ($imap_stream, $query, $handle_errors, &$response, &$message, $unique_id = false) {
  55     if ($imap_stream) {
  56         $sid = sqimap_session_id($unique_id);
  57         fputs ($imap_stream, $sid . ' ' . $query . "\r\n");
  58         $read = sqimap_read_data ($imap_stream, $sid, $handle_errors, $response, $message, $query);
  59         return $read;
  60     } else {
  61         global $squirrelmail_language, $color;
  62         set_up_language($squirrelmail_language);
  63         require_once(SM_PATH . 'functions/display_messages.php');
  64         $string = "<b><font color=$color[2]>\n" .
  65                 _("ERROR : No available imapstream.") .
  66                 "</b></font>\n";
  67         error_box($string,$color);
  68         return false;
  69     }
  70
  71 }
  72
  73
  74 /*
  75  * custom fgets function. gets a line from IMAP
  76  * no matter how big it may be
  77  */
  78
  79 function sqimap_fgets($imap_stream) {
  80     $read = '';
  81     $buffer = 4096;
  82     $results = '';
  83     while (strpos($read, "\n") === false) {
  84         if (!($read = fgets($imap_stream, $buffer))) {
  85             break;
  86         }
  87         $results .= $read;
  88     }
  89     return $results;
  90 }
  91
  92 /*
  93  * Reads the output from the IMAP stream.  If handle_errors is set to true,
  94  * this will also handle all errors that are received.  If it is not set,
  95  * the errors will be sent back through $response and $message
  96  */
  97
  98 function sqimap_read_data_list ($imap_stream, $pre, $handle_errors, &$response, &$message, $query = '') {
  99     global $color, $squirrelmail_language;
 100     $read = '';
 101     $pre_a = explode(' ',trim($pre));
 102     $pre = $pre_a[0];
 103     $resultlist = array();
 104     $data = array();
 105     $read = sqimap_fgets($imap_stream);
 106     while (1) {
 107         switch (true) {
 108             case preg_match("/^$pre (OK|BAD|NO)(.*)$/", $read, $regs):
 109             case preg_match('/^\* (BYE \[ALERT\])(.*)$/', $read, $regs):
 110                 $response = $regs[1];
 111                 $message = trim($regs[2]);
 112                 break 2;
 113             case preg_match("/^\* (OK \[PARSE\])(.*)$/", $read):
 114                 $read = sqimap_fgets($imap_stream);
 115                 break 1;
 116             case preg_match('/^\* ([0-9]+) FETCH.*/', $read, $regs):
 117                 $fetch_data = array();
 118                 $fetch_data[] = $read;
 119                 $read = sqimap_fgets($imap_stream);
 120                 while (!preg_match('/^\* [0-9]+ FETCH.*/', $read) &&
 121                        !preg_match("/^$pre (OK|BAD|NO)(.*)$/", $read)) {
 122                     $fetch_data[] = $read;
 123                     $last = $read;
 124                     $read = sqimap_fgets($imap_stream);
 125                 }
 126                 if (isset($last) && preg_match('/^\)/', $last)) {
 127                     array_pop($fetch_data);
 128                 }
 129                 $resultlist[] = $fetch_data;
 130                 break 1;
 131             default:
 132                 $data[] = $read;
 133                 $read = sqimap_fgets($imap_stream);
 134                 break 1;
 135         }
 136     }
 137     if (!empty($data)) {
 138         $resultlist[] = $data;
 139     }
 140     elseif (empty($resultlist)) {
 141         $resultlist[] = array();
 142     }
 143     if ($handle_errors == false) {
 144         return( $resultlist );
 145     }
 146     elseif ($response == 'NO') {
 147     /* ignore this error from M$ exchange, it is not fatal (aka bug) */
 148         if (strstr($message, 'command resulted in') === false) {
 149             set_up_language($squirrelmail_language);
 150             require_once(SM_PATH . 'functions/display_messages.php');
 151             $string = "<b><font color=$color[2]>\n" .
 152                 _("ERROR : Could not complete request.") .
 153                 "</b><br>\n" .
 154                 _("Query:") . ' ' .
 155                 htmlspecialchars($query) . '<br>' .
 156                 _("Reason Given: ") .
 157                 htmlspecialchars($message) . "</font><br>\n";
 158             error_box($string,$color);
 159             exit;
 160         }
 161     }
 162     elseif ($response == 'BAD') {
 163         set_up_language($squirrelmail_language);
 164         require_once(SM_PATH . 'functions/display_messages.php');
 165         $string = "<b><font color=$color[2]>\n" .
 166             _("ERROR : Bad or malformed request.") .
 167             "</b><br>\n" .
 168             _("Query:") . ' '.
 169             htmlspecialchars($query) . '<br>' .
 170             _("Server responded: ") .
 171             htmlspecialchars($message) . "</font><br>\n";
 172         error_box($string,$color);
 173         exit;
 174     }
 175     else {
 176         return $resultlist;
 177     }
 178 }
 179
 180 function sqimap_read_data ($imap_stream, $pre, $handle_errors, &$response, &$message, $query = '') {
 181     $res = sqimap_read_data_list($imap_stream, $pre, $handle_errors, $response, $message, $query);
 182
 183     /* sqimap_read_data should be called for one response
 184        but since it just calls sqimap_read_data_list which
 185        handles multiple responses we need to check for that
 186        and merge the $res array IF they are seperated and
 187        IF it was a FETCH response. */
 188
 189     if (isset($res[1]) && is_array($res[1]) && isset($res[1][0])
 190         && preg_match('/^\* \d+ FETCH/', $res[1][0])) {
 191         $result = array();
 192         foreach($res as $index=>$value) {
 193             $result = array_merge($result, $res["$index"]);
 194         }
 195     }
 196     if (isset($result)) {
 197         return $result;
 198     }
 199     else {
 200         return $res[0];
 201     }
 202
 203 }
 204
 205 /*
 206  * Logs the user into the imap server.  If $hide is set, no error messages
 207  * will be displayed.  This function returns the imap connection handle.
 208  */
 209 function sqimap_login ($username, $password, $imap_server_address, $imap_port, $hide) {
 210     global $color, $squirrelmail_language, $onetimepad, $use_imap_tls, $imap_auth_mech;
 211
 212     $imap_server_address = sqimap_get_user_server($imap_server_address, $username);
 213         $host=$imap_server_address;
 214
 215         if (($use_imap_tls == true) and (check_php_version(4,3)) and (extension_loaded('openssl'))) {
 216           /* Use TLS by prefixing "tls://" to the hostname */
 217           $imap_server_address = 'tls://' . $imap_server_address;
 218         }
 219
 220     $imap_stream = fsockopen ( $imap_server_address, $imap_port, $error_number, $error_string, 15);
 221
 222     /* Do some error correction */
 223     if (!$imap_stream) {
 224         if (!$hide) {
 225             set_up_language($squirrelmail_language, true);
 226             require_once(SM_PATH . 'functions/display_messages.php');
 227             $string = sprintf (_("Error connecting to IMAP server: %s.") .
 228                               "<br>\r\n", $imap_server_address) .
 229                       "$error_number : $error_string<br>\r\n";
 230             logout_error($string,$color);
 231         }
 232         exit;
 233     }
 234
 235     $server_info = fgets ($imap_stream, 1024);
 236
 237     /* Decrypt the password */
 238     $password = OneTimePadDecrypt($password, $onetimepad);
 239
 240         if (($imap_auth_mech == 'cram-md5') OR ($imap_auth_mech == 'digest-md5')) {
 241       // We're using some sort of authentication OTHER than plain or login
 242           $tag=sqimap_session_id(false);
 243           if ($imap_auth_mech == 'digest-md5') {
 244             $query = $tag . " AUTHENTICATE DIGEST-MD5\r\n";
 245           } elseif ($imap_auth_mech == 'cram-md5') {
 246             $query = $tag . " AUTHENTICATE CRAM-MD5\r\n";
 247           }
 248           fputs($imap_stream,$query);
 249           $answer=sqimap_fgets($imap_stream);
 250           // Trim the "+ " off the front
 251           $response=explode(" ",$answer,3);
 252           if ($response[0] == '+') {
 253             // Got a challenge back
 254                 $challenge=$response[1];
 255                 if ($imap_auth_mech == 'digest-md5') {
 256                   $reply = digest_md5_response($username,$password,$challenge,'imap',$host);
 257                 } elseif ($imap_auth_mech == 'cram-md5') {
 258                   $reply = cram_md5_response($username,$password,$challenge);
 259                 }
 260                 fputs($imap_stream,$reply);
 261                 $read=sqimap_fgets($imap_stream);
 262                 if ($imap_auth_mech == 'digest-md5') {
 263                   // DIGEST-MD5 has an extra step..
 264                   if (substr($read,0,1) == '+') { // OK so far..
 265                     fputs($imap_stream,"\r\n");
 266                     $read=sqimap_fgets($imap_stream);
 267                   }
 268                 }
 269                 $results=explode(" ",$read,3);
 270                 $response=$results[1];
 271                 $message=$results[2];
 272       } else {
 273                 // Fake the response, so the error trap at the bottom will work
 274                 $response="BAD";
 275                 $message='IMAP server does not appear to support the authentication method selected.';
 276                 $message .= '  Please contact your system administrator.';
 277       }
 278     } elseif ($imap_auth_mech == 'login') {
 279           // Original IMAP login code
 280       $query = 'LOGIN "' . quoteIMAP($username) .  '" "' . quoteIMAP($password) . '"';
 281       $read = sqimap_run_command ($imap_stream, $query, false, $response, $message);
 282     } elseif ($imap_auth_mech == 'plain') {
 283                 /* Replace this with SASL PLAIN if it ever gets implemented */
 284                 $response="BAD";
 285                 $message='SquirrelMail does not support SASL PLAIN yet. Rerun conf.pl and use login instead.';
 286         } else {
 287                 $response="BAD";
 288                 $message="Internal SquirrelMail error - unknown IMAP authentication method chosen.  Please contact the developers.";
 289         }
 290
 291         /* If the connection was not successful, lets see why */
 292     if ($response != 'OK') {
 293         if (!$hide) {
 294             if ($response != 'NO') {
 295                 /* "BAD" and anything else gets reported here. */
 296                 $message = htmlspecialchars($message);
 297                 set_up_language($squirrelmail_language, true);
 298                 require_once(SM_PATH . 'functions/display_messages.php');
 299                 if ($response == 'BAD') {
 300                    $string = sprintf (_("Bad request: %s")."<br>\r\n", $message);
 301                 } else {
 302                    $string = sprintf (_("Unknown error: %s") . "<br>\n", $message);
 303                 }
 304                 if (isset($read) && is_array($read)) {
 305                         $string .= '<br>' . _("Read data:") . "<br>\n";
 306                     foreach ($read as $line) {
 307                         $string .= htmlspecialchars($line) . "<br>\n";
 308                     }
 309                 }
 310                 error_box($string,$color);
 311                 exit;
 312             } else {
 313                 /*
 314                  * If the user does not log in with the correct
 315                  * username and password it is not possible to get the
 316                  * correct locale from the user's preferences.
 317                  * Therefore, apply the same hack as on the login
 318                  * screen.
 319                  *
 320                  * $squirrelmail_language is set by a cookie when
 321                  * the user selects language and logs out
 322                  */
 323
 324                 set_up_language($squirrelmail_language, true);
 325                 include_once(SM_PATH . 'functions/display_messages.php' );
 326                 sqsession_destroy();
 327                 logout_error( _("Unknown user or password incorrect.") );
 328                 exit;
 329             }
 330         } else {
 331             exit;
 332         }
 333     }
 334     return $imap_stream;
 335 }
 336
 337 /* Simply logs out the IMAP session */
 338 function sqimap_logout ($imap_stream) {
 339     /* Logout is not valid until the server returns 'BYE'
 340      * If we don't have an imap_ stream we're already logged out */
 341     if(isset($imap_stream) && $imap_stream)
 342         sqimap_run_command($imap_stream, 'LOGOUT', false, $response, $message);
 343 }
 344
 345 function sqimap_capability($imap_stream, $capability='') {
 346     global $sqimap_capabilities;
 347     if (!is_array($sqimap_capabilities)) {
 348         $read = sqimap_run_command($imap_stream, 'CAPABILITY', true, $a, $b);
 349
 350         $c = explode(' ', $read[0]);
 351         for ($i=2; $i < count($c); $i++) {
 352             $cap_list = explode('=', $c[$i]);
 353             if (isset($cap_list[1])) {
 354                 $sqimap_capabilities[$cap_list[0]] = $cap_list[1];
 355             } else {
 356                 $sqimap_capabilities[$cap_list[0]] = TRUE;
 357             }
 358         }
 359     }
 360     if ($capability) {
 361         if (isset($sqimap_capabilities[$capability])) {
 362             return $sqimap_capabilities[$capability];
 363         } else {
 364             return false;
 365         }
 366     }
 367     return $sqimap_capabilities;
 368 }
 369
 370 /* Returns the delimeter between mailboxes: INBOX/Test, or INBOX.Test */
 371 function sqimap_get_delimiter ($imap_stream = false) {
 372     global $sqimap_delimiter, $optional_delimiter;
 373
 374     /* Use configured delimiter if set */
 375     if((!empty($optional_delimiter)) && $optional_delimiter != 'detect') {
 376         return $optional_delimiter;
 377     }
 378
 379     /* Do some caching here */
 380     if (!$sqimap_delimiter) {
 381         if (sqimap_capability($imap_stream, 'NAMESPACE')) {
 382             /*
 383              * According to something that I can't find, this is supposed to work on all systems
 384              * OS: This won't work in Courier IMAP.
 385              * OS: According to rfc2342 response from NAMESPACE command is:
 386              * OS: * NAMESPACE (PERSONAL NAMESPACES) (OTHER_USERS NAMESPACE) (SHARED NAMESPACES)
 387              * OS: We want to lookup all personal NAMESPACES...
 388              */
 389             $read = sqimap_run_command($imap_stream, 'NAMESPACE', true, $a, $b);
 390             if (eregi('\\* NAMESPACE +(\\( *\\(.+\\) *\\)|NIL) +(\\( *\\(.+\\) *\\)|NIL) +(\\( *\\(.+\\) *\\)|NIL)', $read[0], $data)) {
 391                 if (eregi('^\\( *\\((.*)\\) *\\)', $data[1], $data2)) {
 392                     $pn = $data2[1];
 393                 }
 394                 $pna = explode(')(', $pn);
 395                 while (list($k, $v) = each($pna)) {
 396                     $lst = explode('"', $v);
 397                     if (isset($lst[3])) {
 398                         $pn[$lst[1]] = $lst[3];
 399                     } else {
 400                         $pn[$lst[1]] = '';
 401                     }
 402                 }
 403             }
 404             $sqimap_delimiter = $pn[0];
 405         } else {
 406             fputs ($imap_stream, ". LIST \"INBOX\" \"\"\r\n");
 407             $read = sqimap_read_data($imap_stream, '.', true, $a, $b);
 408             $quote_position = strpos ($read[0], '"');
 409             $sqimap_delimiter = substr ($read[0], $quote_position+1, 1);
 410         }
 411     }
 412     return $sqimap_delimiter;
 413 }
 414
 415
 416 /* Gets the number of messages in the current mailbox. */
 417 function sqimap_get_num_messages ($imap_stream, $mailbox) {
 418     $read_ary = sqimap_run_command ($imap_stream, "EXAMINE \"$mailbox\"", false, $result, $message);
 419     for ($i = 0; $i < count($read_ary); $i++) {
 420         if (ereg("[^ ]+ +([^ ]+) +EXISTS", $read_ary[$i], $regs)) {
 421             return $regs[1];
 422         }
 423     }
 424     return false; //"BUG! Couldn't get number of messages in $mailbox!";
 425 }
 426
 427
 428 /* Returns a displayable email address.
 429  *     Luke Ehresman <lehresma@css.tayloru.edu>
 430  *     "Luke Ehresman" <lehresma@css.tayloru.edu>
 431  *     <lehresma@css.tayloru.edu>
 432  *     lehresma@css.tayloru.edu (Luke Ehresman)
 433  *     lehresma@css.tayloru.edu
 434  * becomes: lehresma@css.tayloru.edu
 435  */
 436 function sqimap_find_email ($string) {
 437     if (ereg("<([^>]+)>", $string, $regs)) {
 438         $string = $regs[1];
 439     } else if (ereg("([^ ]+@[^ ]+)", $string, $regs)) {
 440         $string = $regs[1];
 441     }
 442     return trim($string);
 443 }
 444
 445
 446 /*
 447  * Takes the From: field and creates a displayable name.
 448  *     Luke Ehresman   <lkehresman@yahoo.com>
 449  *     "Luke Ehresman" <lkehresman@yahoo.com>
 450  *     lkehresman@yahoo.com (Luke Ehresman)
 451  * becomes: Luke Ehresman
 452  *     <lkehresman@yahoo.com>
 453  * becomes: lkehresman@yahoo.com
 454  */
 455 function sqimap_find_displayable_name ($string) {
 456     $string = trim($string);
 457
 458     if ( ereg('^(.+)<.*>', $string, $regs) ) {
 459         $orig_string = $string;
 460         $string = str_replace ('"', '', $regs[1] );
 461         if (trim($string) == '') {
 462              $string = sqimap_find_email($orig_string);
 463         }
 464         if( $string == '' || $string == ' ' ){
 465             $string = '&nbsp;';
 466         }
 467     }
 468     elseif ( ereg('\((.*)\)', $string, $regs) ) {
 469         if( ( $regs[1] == '' ) || ( $regs[1] == ' ' ) ){
 470             if ( ereg('^(.+) \(', $string, $regs) ) {
 471                $string = ereg_replace( ' \(\)$', '', $string );
 472             } else {
 473                $string = '&nbsp;';
 474             }
 475         } else {
 476             $string = $regs[1];
 477         }
 478     }
 479     else {
 480         $string = str_replace ('"', '', sqimap_find_email($string));
 481     }
 482
 483     return trim($string);
 484 }
 485
 486 /*
 487  * Returns the number of unseen messages in this folder
 488  */
 489 function sqimap_unseen_messages ($imap_stream, $mailbox) {
 490     $read_ary = sqimap_run_command ($imap_stream, "STATUS \"$mailbox\" (UNSEEN)", false, $result, $message);
 491     $i = 0;
 492     $regs = array(false, false);
 493     while (isset($read_ary[$i])) {
 494         if (ereg("UNSEEN ([0-9]+)", $read_ary[$i], $regs)) {
 495             break;
 496         }
 497         $i++;
 498     }
 499     return $regs[1];
 500 }
 501
 502 /*
 503  * Returns the number of unseen/total messages in this folder
 504  */
 505 function sqimap_status_messages ($imap_stream, $mailbox) {
 506     $read_ary = sqimap_run_command ($imap_stream, "STATUS \"$mailbox\" (MESSAGES UNSEEN)", false, $result, $message);
 507     $i = 0;
 508     $messages = $unseen = false;
 509     $regs = array(false,false);
 510     while (isset($read_ary[$i])) {
 511         if (preg_match('/UNSEEN\s+([0-9]+)/i', $read_ary[$i], $regs)) {
 512             $unseen = $regs[1];
 513         }
 514         if (preg_match('/MESSAGES\s+([0-9]+)/i', $read_ary[$i], $regs)) {
 515             $messages = $regs[1];
 516         }
 517         $i++;
 518     }
 519     return array('MESSAGES' => $messages, 'UNSEEN'=>$unseen);
 520 }
 521
 522
 523 /*
 524  *  Saves a message to a given folder -- used for saving sent messages
 525  */
 526 function sqimap_append ($imap_stream, $sent_folder, $length) {
 527     fputs ($imap_stream, sqimap_session_id() . " APPEND \"$sent_folder\" (\\Seen) \{$length}\r\n");
 528     $tmp = fgets ($imap_stream, 1024);
 529 }
 530
 531 function sqimap_append_done ($imap_stream, $folder='') {
 532     global $squirrelmail_language, $color;
 533     fputs ($imap_stream, "\r\n");
 534     $tmp = fgets ($imap_stream, 1024);
 535     if (preg_match("/(.*)(BAD|NO)(.*)$/", $tmp, $regs)) {
 536         set_up_language($squirrelmail_language);
 537         require_once(SM_PATH . 'functions/display_messages.php');
 538         $reason = $regs[3];
 539         if ($regs[2] == 'NO') {
 540            $string = "<b><font color=$color[2]>\n" .
 541                   _("ERROR : Could not append message to") ." $folder." .
 542                   "</b><br>\n" .
 543                   _("Server responded: ") .
 544                   $reason . "<br>\n";
 545            if (preg_match("/(.*)(quota)(.*)$/i", $reason, $regs)) {
 546               $string .= _("Solution: ") .
 547             _("Remove unneccessary messages from your folder and start with your Trash folder.")
 548               ."<br>\n";
 549            }
 550            $string .= "</font>\n";
 551            error_box($string,$color);
 552         } else {
 553            $string = "<b><font color=$color[2]>\n" .
 554                   _("ERROR : Bad or malformed request.") .
 555                   "</b><br>\n" .
 556                   _("Server responded: ") .
 557                   $tmp . "</font><br>\n";
 558            error_box($string,$color);
 559            exit;
 560         }
 561     }
 562 }
 563
 564 function sqimap_get_user_server ($imap_server, $username) {
 565    if (substr($imap_server, 0, 4) != "map:") {
 566        return $imap_server;
 567    }
 568    $function = substr($imap_server, 4);
 569    return $function($username);
 570 }
 571
 572 /* This is an example that gets imapservers from yellowpages (NIS).
 573  * you can simple put map:map_yp_alias in your $imap_server_address
 574  * in config.php use your own function instead map_yp_alias to map your
 575  * LDAP whatever way to find the users imapserver. */
 576
 577 function map_yp_alias($username) {
 578    $yp = `ypmatch $username aliases`;
 579    return chop(substr($yp, strlen($username)+1));
 580 }
 581
 582 ?>