functions/imap_general.php

   1 <?php
   2
   3 /**
   4  * imap_general.php
   5  *
   6  * Copyright (c) 1999-2002 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
  16 global $sqimap_session_id;
  17 $sqimap_session_id = 1;
  18
  19 /* Sets an unique session id in order to avoid simultanous sessions crash. */
  20 function sqimap_session_id($unique_id = false) {
  21     global $data_dir, $username, $sqimap_session_id;
  22     if (!$unique_id) {
  23         return( sprintf("A%03d", $sqimap_session_id++) );
  24     } else {
  25         return( sprintf("A%03d", $sqimap_session_id++) . ' UID' );
  26     }
  27 }
  28
  29 /*
  30  * Both send a command and accept the result from the command.
  31  * This is to allow proper session number handling.
  32  */
  33 function sqimap_run_command_list ($imap_stream, $query, $handle_errors, &$response, &$message, $unique_id = false) {
  34     $sid = sqimap_session_id($unique_id);
  35     fputs ($imap_stream, $sid . ' ' . $query . "\r\n");
  36     $read = sqimap_read_data_list ($imap_stream, $sid, $handle_errors, $response, $message, $query );
  37     return $read;
  38 }
  39
  40 function sqimap_run_command ($imap_stream, $query, $handle_errors, &$response, &$message, $unique_id = false) {
  41     $sid = sqimap_session_id($unique_id);
  42     fputs ($imap_stream, $sid . ' ' . $query . "\r\n");
  43     $read = sqimap_read_data ($imap_stream, $sid, $handle_errors, $response, $message, $query);
  44     return $read;
  45 }
  46
  47
  48 /*
  49  * custom fgets function. gets a line from IMAP
  50  * no matter how big it may be
  51  */
  52
  53 function sqimap_fgets($imap_stream) {
  54     $read = '';
  55     $buffer = 4096;
  56     $results = '';
  57     while (strpos($read, "\n") === false) {
  58         if (!($read = fgets($imap_stream, $buffer))) {
  59             break;
  60         }
  61         $results .= $read;
  62     }
  63     return $results;
  64 }
  65
  66 /*
  67  * Reads the output from the IMAP stream.  If handle_errors is set to true,
  68  * this will also handle all errors that are received.  If it is not set,
  69  * the errors will be sent back through $response and $message
  70  */
  71
  72 function sqimap_read_data_list ($imap_stream, $pre, $handle_errors, &$response, &$message, $query = '') {
  73     global $color, $squirrelmail_language;
  74     $read = '';
  75     $pre_a = explode(' ',trim($pre));
  76     $pre = $pre_a[0];
  77     $resultlist = array();
  78     $data = array();
  79     $read = sqimap_fgets($imap_stream);
  80     while (1) {
  81         switch (true) {
  82             case preg_match("/^$pre (OK|BAD|NO)(.*)$/", $read, $regs):
  83             case preg_match('/^\* (BYE \[ALERT\])(.*)$/', $read, $regs):
  84                 $response = $regs[1];
  85                 $message = trim($regs[2]);
  86                 break 2;
  87             case preg_match("/^\* (OK \[PARSE\])(.*)$/", $read):
  88                 $read = sqimap_fgets($imap_stream);
  89                 break 1;
  90             case preg_match('/^\* ([0-9]+) FETCH.*/', $read, $regs):
  91                 $fetch_data = array();
  92                 $fetch_data[] = $read;
  93                 $read = sqimap_fgets($imap_stream);
  94                 while (!preg_match('/^\* [0-9]+ FETCH.*/', $read) &&
  95                        !preg_match("/^$pre (OK|BAD|NO)(.*)$/", $read)) {
  96                     $fetch_data[] = $read;
  97                     $last = $read;
  98                     $read = sqimap_fgets($imap_stream);
  99                 }
 100                 if (isset($last) && preg_match('/^\)/', $last)) {
 101                     array_pop($fetch_data);
 102                 }
 103                 $resultlist[] = $fetch_data;
 104                 break 1;
 105             default:
 106                 $data[] = $read;
 107                 $read = sqimap_fgets($imap_stream);
 108                 break 1;
 109         }
 110     }
 111     if (!empty($data)) {
 112         $resultlist[] = $data;
 113     }
 114     elseif (empty($resultlist)) {
 115         $resultlist[] = array();
 116     }
 117     if ($handle_errors == false) {
 118         return( $resultlist );
 119     }
 120     elseif ($response == 'NO') {
 121     /* ignore this error from M$ exchange, it is not fatal (aka bug) */
 122         if (strstr($message, 'command resulted in') === false) {
 123             set_up_language($squirrelmail_language);
 124             require_once(SM_PATH . 'functions/display_messages.php');
 125             $string = "<b><font color=$color[2]>\n" .
 126                 _("ERROR : Could not complete request.") .
 127                 "</b><br>\n" .
 128                 _("Query:") .
 129                 $query . '<br>' .
 130                 _("Reason Given: ") .
 131                 $message . "</font><br>\n";
 132             error_box($string,$color);
 133             exit;
 134         }
 135     }
 136     elseif ($response == 'BAD') {
 137         set_up_language($squirrelmail_language);
 138         require_once(SM_PATH . 'functions/display_messages.php');
 139         $string = "<b><font color=$color[2]>\n" .
 140             _("ERROR : Bad or malformed request.") .
 141             "</b><br>\n" .
 142             _("Query:") .
 143             $query . '<br>' .
 144             _("Server responded: ") .
 145             $message . "</font><br>\n";
 146         error_box($string,$color);
 147         exit;
 148     }
 149     else {
 150         return $resultlist;
 151     }
 152 }
 153
 154 function sqimap_read_data ($imap_stream, $pre, $handle_errors, &$response, &$message, $query = '') {
 155     $res = sqimap_read_data_list($imap_stream, $pre, $handle_errors, $response, $message, $query);
 156
 157     /* sqimap_read_data should be called for one response
 158        but since it just calls sqimap_read_data_list which
 159        handles multiple responses we need to check for that
 160        and merge the $res array IF they are seperated and
 161        IF it was a FETCH response. */
 162
 163     if (isset($res[1]) && is_array($res[1]) && isset($res[1][0])
 164         && preg_match('/^\* \d+ FETCH/', $res[1][0])) {
 165         $result = array();
 166         foreach($res as $index=>$value) {
 167             $result = array_merge($result, $res["$index"]);
 168         }
 169     }
 170     if (isset($result)) {
 171         return $result;
 172     }
 173     else {
 174         return $res[0];
 175     }
 176
 177 }
 178
 179 /*
 180  * Logs the user into the imap server.  If $hide is set, no error messages
 181  * will be displayed.  This function returns the imap connection handle.
 182  */
 183 function sqimap_login ($username, $password, $imap_server_address, $imap_port, $hide) {
 184     global $color, $squirrelmail_language, $onetimepad;
 185
 186     $imap_server_address = sqimap_get_user_server($imap_server_address, $username);
 187
 188     $imap_stream = fsockopen ( $imap_server_address, $imap_port, $error_number, $error_string, 15);
 189     if ( !$imap_stream ) {
 190         return false;
 191     }
 192     $server_info = fgets ($imap_stream, 1024);
 193
 194     /* Decrypt the password */
 195     $password = OneTimePadDecrypt($password, $onetimepad);
 196
 197     /* Do some error correction */
 198     if (!$imap_stream) {
 199         if (!$hide) {
 200             set_up_language($squirrelmail_language, true);
 201             require_once(SM_PATH . 'functions/display_messages.php');
 202             $string = sprintf (_("Error connecting to IMAP server: %s.") .
 203                               "<br>\r\n", $imap_server_address) .
 204                       "$error_number : $error_string<br>\r\n";
 205             error_box($string,$color);
 206         }
 207         exit;
 208     }
 209
 210     $query = 'LOGIN "' . quoteIMAP($username) .  '" "' . quoteIMAP($password) . '"';
 211     $read = sqimap_run_command ($imap_stream, $query, false, $response, $message);
 212
 213     /* If the connection was not successful, lets see why */
 214     if ($response != 'OK') {
 215         if (!$hide) {
 216             if ($response != 'NO') {
 217                 /* "BAD" and anything else gets reported here. */
 218                 set_up_language($squirrelmail_language, true);
 219                 require_once(SM_PATH . 'functions/display_messages.php');
 220                 if ($response == 'BAD') {
 221                    $string = sprintf (_("Bad request: %s")."<br>\r\n", $message);
 222                 } else {
 223                    $string = sprintf (_("Unknown error: %s") . "<br>\n", $message);
 224                 }
 225                 $string .= '<br>' . _("Read data:") . "<br>\n";
 226                 if (is_array($read)) {
 227                     foreach ($read as $line) {
 228                         $string .= htmlspecialchars($line) . "<br>\n";
 229                     }
 230                 }
 231                 error_box($string,$color);
 232                 exit;
 233             } else {
 234                 /*
 235                  * If the user does not log in with the correct
 236                  * username and password it is not possible to get the
 237                  * correct locale from the user's preferences.
 238                  * Therefore, apply the same hack as on the login
 239                  * screen.
 240                  *
 241                  * $squirrelmail_language is set by a cookie when
 242                  * the user selects language and logs out
 243                  */
 244
 245                 set_up_language($squirrelmail_language, true);
 246                 include_once(SM_PATH . 'functions/display_messages.php' );
 247                 sqsession_destroy();
 248                 logout_error( _("Unknown user or password incorrect.") );
 249                 exit;
 250             }
 251         } else {
 252             exit;
 253         }
 254     }
 255     return $imap_stream;
 256 }
 257
 258 /* Simply logs out the IMAP session */
 259 function sqimap_logout ($imap_stream) {
 260     /* Logout is not valid until the server returns 'BYE' */
 261     sqimap_run_command($imap_stream, 'LOGOUT', false, $response, $message);
 262 }
 263
 264 function sqimap_capability($imap_stream, $capability='') {
 265     global $sqimap_capabilities;
 266     if (!is_array($sqimap_capabilities)) {
 267         $read = sqimap_run_command($imap_stream, 'CAPABILITY', true, $a, $b);
 268
 269         $c = explode(' ', $read[0]);
 270         for ($i=2; $i < count($c); $i++) {
 271             $cap_list = explode('=', $c[$i]);
 272             if (isset($cap_list[1])) {
 273                 $sqimap_capabilities[$cap_list[0]] = $cap_list[1];
 274             } else {
 275                 $sqimap_capabilities[$cap_list[0]] = TRUE;
 276             }
 277         }
 278     }
 279     if ($capability) {
 280         if (isset($sqimap_capabilities[$capability])) {
 281             return $sqimap_capabilities[$capability];
 282         } else {
 283             return false;
 284         }
 285     }
 286     return $sqimap_capabilities;
 287 }
 288
 289 /* Returns the delimeter between mailboxes: INBOX/Test, or INBOX.Test */
 290 function sqimap_get_delimiter ($imap_stream = false) {
 291     global $sqimap_delimiter, $optional_delimiter;
 292
 293     /* Use configured delimiter if set */
 294     if((!empty($optional_delimiter)) && $optional_delimiter != 'detect') {
 295         return $optional_delimiter;
 296     }
 297
 298     /* Do some caching here */
 299     if (!$sqimap_delimiter) {
 300         if (sqimap_capability($imap_stream, 'NAMESPACE')) {
 301             /*
 302              * According to something that I can't find, this is supposed to work on all systems
 303              * OS: This won't work in Courier IMAP.
 304              * OS: According to rfc2342 response from NAMESPACE command is:
 305              * OS: * NAMESPACE (PERSONAL NAMESPACES) (OTHER_USERS NAMESPACE) (SHARED NAMESPACES)
 306              * OS: We want to lookup all personal NAMESPACES...
 307              */
 308             $read = sqimap_run_command($imap_stream, 'NAMESPACE', true, $a, $b);
 309             if (eregi('\\* NAMESPACE +(\\( *\\(.+\\) *\\)|NIL) +(\\( *\\(.+\\) *\\)|NIL) +(\\( *\\(.+\\) *\\)|NIL)', $read[0], $data)) {
 310                 if (eregi('^\\( *\\((.*)\\) *\\)', $data[1], $data2)) {
 311                     $pn = $data2[1];
 312                 }
 313                 $pna = explode(')(', $pn);
 314                 while (list($k, $v) = each($pna)) {
 315                     $lst = explode('"', $v);
 316                     if (isset($lst[3])) {
 317                         $pn[$lst[1]] = $lst[3];
 318                     } else {
 319                         $pn[$lst[1]] = '';
 320                     }
 321                 }
 322             }
 323             $sqimap_delimiter = $pn[0];
 324         } else {
 325             fputs ($imap_stream, ". LIST \"INBOX\" \"\"\r\n");
 326             $read = sqimap_read_data($imap_stream, '.', true, $a, $b);
 327             $quote_position = strpos ($read[0], '"');
 328             $sqimap_delimiter = substr ($read[0], $quote_position+1, 1);
 329         }
 330     }
 331     return $sqimap_delimiter;
 332 }
 333
 334
 335 /* Gets the number of messages in the current mailbox. */
 336 function sqimap_get_num_messages ($imap_stream, $mailbox) {
 337     $read_ary = sqimap_run_command ($imap_stream, "EXAMINE \"$mailbox\"", false, $result, $message);
 338     for ($i = 0; $i < count($read_ary); $i++) {
 339         if (ereg("[^ ]+ +([^ ]+) +EXISTS", $read_ary[$i], $regs)) {
 340             return $regs[1];
 341         }
 342     }
 343     return false; //"BUG! Couldn't get number of messages in $mailbox!";
 344 }
 345
 346
 347 /* Returns a displayable email address.
 348  *     Luke Ehresman <lehresma@css.tayloru.edu>
 349  *     "Luke Ehresman" <lehresma@css.tayloru.edu>
 350  *     <lehresma@css.tayloru.edu>
 351  *     lehresma@css.tayloru.edu (Luke Ehresman)
 352  *     lehresma@css.tayloru.edu
 353  * becomes: lehresma@css.tayloru.edu
 354  */
 355 function sqimap_find_email ($string) {
 356     if (ereg("<([^>]+)>", $string, $regs)) {
 357         $string = $regs[1];
 358     } else if (ereg("([^ ]+@[^ ]+)", $string, $regs)) {
 359         $string = $regs[1];
 360     }
 361     return trim($string);
 362 }
 363
 364
 365 /*
 366  * Takes the From: field and creates a displayable name.
 367  *     Luke Ehresman   <lkehresman@yahoo.com>
 368  *     "Luke Ehresman" <lkehresman@yahoo.com>
 369  *     lkehresman@yahoo.com (Luke Ehresman)
 370  * becomes: Luke Ehresman
 371  *     <lkehresman@yahoo.com>
 372  * becomes: lkehresman@yahoo.com
 373  */
 374 function sqimap_find_displayable_name ($string) {
 375     $string = trim($string);
 376
 377     if ( ereg('^(.+)<.*>', $string, $regs) ) {
 378         $orig_string = $string;
 379         $string = str_replace ('"', '', $regs[1] );
 380         if (trim($string) == '') {
 381              $string = sqimap_find_email($orig_string);
 382         }
 383         if( $string == '' || $string == ' ' ){
 384             $string = '&nbsp';
 385         }
 386     }
 387     elseif ( ereg('\((.*)\)', $string, $regs) ) {
 388         if( ( $regs[1] == '' ) || ( $regs[1] == ' ' ) ){
 389             if ( ereg('^(.+) \(', $string, $regs) ) {
 390                $string = ereg_replace( ' \(\)$', '', $string );
 391             } else {
 392                $string = '&nbsp';
 393             }
 394         } else {
 395             $string = $regs[1];
 396         }
 397     }
 398     else {
 399         $string = str_replace ('"', '', sqimap_find_email($string));
 400     }
 401
 402     return trim($string);
 403 }
 404
 405 /*
 406  * Returns the number of unseen messages in this folder
 407  */
 408 function sqimap_unseen_messages ($imap_stream, $mailbox) {
 409     $read_ary = sqimap_run_command ($imap_stream, "STATUS \"$mailbox\" (UNSEEN)", false, $result, $message);
 410     $i = 0;
 411     $regs = array(false, false);
 412     while (isset($read_ary[$i])) {
 413         if (ereg("UNSEEN ([0-9]+)", $read_ary[$i], $regs)) {
 414             break;
 415         }
 416         $i++;
 417     }
 418     return $regs[1];
 419 }
 420
 421 /*
 422  * Returns the number of unseen/total messages in this folder
 423  */
 424 function sqimap_status_messages ($imap_stream, $mailbox) {
 425     $read_ary = sqimap_run_command ($imap_stream, "STATUS \"$mailbox\" (MESSAGES UNSEEN)", false, $result, $message);
 426     $i = 0;
 427     $messages = $unseen = false;
 428     $regs = array(false,false);
 429     while (isset($read_ary[$i])) {
 430         if (preg_match('/UNSEEN\s+([0-9]+)/i', $read_ary[$i], $regs)) {
 431             $unseen = $regs[1];
 432         }
 433         if (preg_match('/MESSAGES\s+([0-9]+)/i', $read_ary[$i], $regs)) {
 434             $messages = $regs[1];
 435         }
 436         $i++;
 437     }
 438     return array('MESSAGES' => $messages, 'UNSEEN'=>$unseen);
 439 }
 440
 441
 442 /*
 443  *  Saves a message to a given folder -- used for saving sent messages
 444  */
 445 function sqimap_append ($imap_stream, $sent_folder, $length) {
 446     fputs ($imap_stream, sqimap_session_id() . " APPEND \"$sent_folder\" (\\Seen) \{$length}\r\n");
 447     $tmp = fgets ($imap_stream, 1024);
 448 }
 449
 450 function sqimap_append_done ($imap_stream) {
 451     global $squirrelmail_language, $color;
 452     fputs ($imap_stream, "\r\n");
 453     $tmp = fgets ($imap_stream, 1024);
 454     if (preg_match("/(.*)(BAD|NO)(.*)$/", $tmp, $regs)) {
 455         set_up_language($squirrelmail_language);
 456         require_once(SM_PATH . 'functions/display_messages.php');
 457         $string = "<b><font color=$color[2]>\n" .
 458                   _("ERROR : Bad or malformed request.") .
 459                   "</b><br>\n" .
 460                   _("Server responded: ") .
 461                   $tmp . "</font><br>\n";
 462         error_box($string,$color);
 463         exit;
 464     }
 465 }
 466
 467 function sqimap_get_user_server ($imap_server, $username) {
 468    if (substr($imap_server, 0, 4) != "map:") {
 469        return $imap_server;
 470    }
 471    $function = substr($imap_server, 4);
 472    return $function($username);
 473 }
 474
 475 /* This is an example that gets imapservers from yellowpages (NIS).
 476  * you can simple put map:map_yp_alias in your $imap_server_address
 477  * in config.php use your own function instead map_yp_alias to map your
 478  * LDAP whatever way to find the users imapserver. */
 479
 480 function map_yp_alias($username) {
 481    $yp = `ypmatch $username aliases`;
 482    return chop(substr($yp, strlen($username)+1));
 483 }
 484
 485 ?>