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<?php
/**
* mail_fetch/functions.php
*
* Functions for the mailfetch plugin.
*
* Original code from LexZEUS <lexzeus@mifinca.com>
* and josh@superfork.com (extracted from PHP manual)
* Adapted for MailFetch by Philippe Mingo <mingo@rotedic.com>
*
* @copyright 1999-2010 The SquirrelMail Project Team
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
* @version $Id: functions.php 13951 2010-06-21 07:19:31Z pdontthink $
* @package plugins
* @subpackage mail_fetch
*/
/** declare plugin globals */
global $mail_fetch_allow_unsubscribed;
/**
* Controls use of unsubscribed folders in plugin
* @global boolean $mail_fetch_allow_unsubscribed
* @since 1.5.1 and 1.4.5
*/
$mail_fetch_allow_unsubscribed = false;
/**
* Validate a requested POP3 port number
*
* Allowable port numbers are configured in config.php
* (see config_example.php for an example and more
* rules about how the list of allowable port numbers
* can be specified)
*
* @param int $requested_port The port number given by the user
*
* @return string An error string is returned if the port
* number is not allowable, otherwise an
* empty string is returned.
*
*/
function validate_mail_fetch_port_number($requested_port) {
global $mail_fetch_allowable_ports;
@include_once(SM_PATH . 'plugins/mail_fetch/config.php');
if (empty($mail_fetch_allowable_ports))
$mail_fetch_allowable_ports = array(110, 995);
if (in_array('ALL', $mail_fetch_allowable_ports))
return '';
if (!in_array($requested_port, $mail_fetch_allowable_ports)) {
sq_change_text_domain('mail_fetch');
$error = _("Sorry, that port number is not allowed");
sq_change_text_domain('squirrelmail');
return $error;
}
return '';
}
/**
* Validate a requested POP3 server address
*
* Blocked server addresses are configured in config.php
* (see config_example.php for more details)
*
* @param int $requested_address The server address given by the user
*
* @return string An error string is returned if the server
* address is not allowable, otherwise an
* empty string is returned.
*
*/
function validate_mail_fetch_server_address($requested_address) {
global $mail_fetch_block_server_pattern;
@include_once(SM_PATH . 'plugins/mail_fetch/config.php');
if (empty($mail_fetch_block_server_pattern))
$mail_fetch_block_server_pattern = '/(^10\.)|(^192\.)|(^127\.)|(^localhost)/';
if ($mail_fetch_block_server_pattern == 'UNRESTRICTED')
return '';
if (preg_match($mail_fetch_block_server_pattern, $requested_address)) {
sq_change_text_domain('mail_fetch');
$error = _("Sorry, that server address is not allowed");
sq_change_text_domain('squirrelmail');
return $error;
}
return '';
}
function hex2bin( $data ) {
/* Original code by josh@superfork.com */
$len = strlen($data);
$newdata = '';
for( $i=0; $i < $len; $i += 2 ) {
$newdata .= pack( "C", hexdec( substr( $data, $i, 2) ) );
}
return $newdata;
}
function mf_keyED( $txt ) {
global $MF_TIT;
if( !isset( $MF_TIT ) ) {
$MF_TIT = "MailFetch Secure for SquirrelMail 1.x";
}
$encrypt_key = md5( $MF_TIT );
$ctr = 0;
$tmp = "";
for( $i = 0; $i < strlen( $txt ); $i++ ) {
if( $ctr == strlen( $encrypt_key ) ) $ctr=0;
$tmp.= substr( $txt, $i, 1 ) ^ substr( $encrypt_key, $ctr, 1 );
$ctr++;
}
return $tmp;
}
function encrypt( $txt ) {
srand( (double) microtime() * 1000000 );
$encrypt_key = md5( rand( 0, 32000 ) );
$ctr = 0;
$tmp = "";
for( $i = 0; $i < strlen( $txt ); $i++ ) {
if ($ctr==strlen($encrypt_key)) $ctr=0;
$tmp.= substr($encrypt_key,$ctr,1) .
(substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1));
$ctr++;
}
return bin2hex( mf_keyED( $tmp ) );
}
function decrypt( $txt ) {
$txt = mf_keyED( hex2bin( $txt ) );
$tmp = '';
for ( $i=0; $i < strlen( $txt ); $i++ ) {
$md5 = substr( $txt, $i, 1 );
$i++;
$tmp.= ( substr( $txt, $i, 1 ) ^ $md5 );
}
return $tmp;
}
/**
* check mail folder
* @param stream $imap_stream imap connection resource
* @param string $imap_folder imap folder name
* @return boolean true, when folder can be used to store messages.
* @since 1.5.1 and 1.4.5
*/
function mail_fetch_check_folder($imap_stream,$imap_folder) {
global $mail_fetch_allow_unsubscribed;
// check if folder is subscribed or only exists.
if (sqimap_mailbox_is_subscribed($imap_stream,$imap_folder)) {
$ret = true;
} elseif ($mail_fetch_allow_unsubscribed && sqimap_mailbox_exists($imap_stream,$imap_folder)) {
$ret = true;
} else {
$ret = false;
}
// make sure that folder can store messages
if ($ret && mail_fetch_check_noselect($imap_stream,$imap_folder)) {
$ret = false;
}
return $ret;
}
/**
* Checks if folder is noselect (can't store messages)
*
* Function does not check if folder subscribed.
* @param stream $imap_stream imap connection resource
* @param string $imap_folder imap folder name
* @return boolean true, when folder has noselect flag. false in any other case.
* @since 1.5.1 and 1.4.5
*/
function mail_fetch_check_noselect($imap_stream,$imap_folder) {
$boxes=sqimap_mailbox_list($imap_stream);
foreach($boxes as $box) {
if ($box['unformatted']==$imap_folder) {
return (bool) check_is_noselect($box['raw']);
}
}
return false;
}
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