<?php

/**

 * mail_fetch/setup.php

 *

 * Copyright (c) 1999-2011 CDI (cdi@thewebmasters.net) All Rights Reserved

 * Modified by Philippe Mingo 2001-2009 mingo@rotedic.com

 * An RFC 1939 compliant wrapper class for the POP3 protocol.

 *

 * Licensed under the GNU GPL. For full terms see the file COPYING.

 *

 * POP3 class

 *

 * @copyright 1999-2011 The SquirrelMail Project Team

 * @license https://opensource.org/licenses/gpl-license.php GNU Public License

 * @package plugins

 * @subpackage mail_fetch

 */

class POP3 {

    var $ERROR      = '';       //  Error string.

    var $TIMEOUT    = 60;       //  Default timeout before giving up on a

                                //  network operation.

    var $COUNT      = -1;       //  Mailbox msg count

    var $BUFFER     = 512;      //  Socket buffer for socket fgets() calls.

                                //  Per RFC 1939 the returned line a POP3

                                //  server can send is 512 bytes.

    var $FP         = '';       //  The connection to the server's

                                //  file descriptor

    var $MAILSERVER = '';       // Set this to hard code the server name

    var $DEBUG      = FALSE;    // set to true to echo pop3

                                // commands and responses to error_log

                                // this WILL log passwords!

    var $BANNER     = '';       //  Holds the banner returned by the

                                //  pop server - used for apop()

    var $ALLOWAPOP  = FALSE;    //  Allow or disallow apop()

                                //  This must be set to true

                                //  manually

	/**

	 * PHP5 constructor.

	 */

    function __construct ( $server = '', $timeout = '' ) {

        settype($this->BUFFER,"integer");

        if( !empty($server) ) {

            // Do not allow programs to alter MAILSERVER

            // if it is already specified. They can get around

            // this if they -really- want to, so don't count on it.

            if(empty($this->MAILSERVER))

                $this->MAILSERVER = $server;

        }

        if(!empty($timeout)) {

            settype($timeout,"integer");

            $this->TIMEOUT = $timeout;

            if(function_exists("set_time_limit")){

                set_time_limit($timeout);

            }

        }

        return true;

    }

	/**

	 * PHP4 constructor.

	 */

	public function POP3( $server = '', $timeout = '' ) {

		self::__construct( $server, $timeout );

	}

    function update_timer () {

        if(function_exists("set_time_limit")){

            set_time_limit($this->TIMEOUT);

        }

        return true;

    }

    function connect ($server, $port = 110)  {

        //  Opens a socket to the specified server. Unless overridden,

        //  port defaults to 110. Returns true on success, false on fail

        // If MAILSERVER is set, override $server with its value.

    if (!isset($port) || !$port) {$port = 110;}

        if(!empty($this->MAILSERVER))

            $server = $this->MAILSERVER;

        if(empty($server)){

            $this->ERROR = "POP3 connect: " . _("No server specified");

            unset($this->FP);

            return false;

        }

        $fp = @fsockopen("$server", $port, $errno, $errstr);

        if(!$fp) {

            $this->ERROR = "POP3 connect: " . _("Error ") . "[$errno] [$errstr]";

            unset($this->FP);

            return false;

        }

        socket_set_blocking($fp,-1);

        $this->update_timer();

        $reply = fgets($fp,$this->BUFFER);

        $reply = $this->strip_clf($reply);

        if($this->DEBUG)

            error_log("POP3 SEND [connect: $server] GOT [$reply]",0);

        if(!$this->is_ok($reply)) {

            $this->ERROR = "POP3 connect: " . _("Error ") . "[$reply]";

            unset($this->FP);

            return false;

        }

        $this->FP = $fp;

        $this->BANNER = $this->parse_banner($reply);

        return true;

    }

    function user ($user = "") {

        // Sends the USER command, returns true or false

        if( empty($user) ) {

            $this->ERROR = "POP3 user: " . _("no login ID submitted");

            return false;

        } elseif(!isset($this->FP)) {

            $this->ERROR = "POP3 user: " . _("connection not established");

            return false;

        } else {

            $reply = $this->send_cmd("USER $user");

            if(!$this->is_ok($reply)) {

                $this->ERROR = "POP3 user: " . _("Error ") . "[$reply]";

                return false;

            } else

                return true;

        }

    }

    function pass ($pass = "")     {

        // Sends the PASS command, returns # of msgs in mailbox,

        // returns false (undef) on Auth failure

        if(empty($pass)) {

            $this->ERROR = "POP3 pass: " . _("No password submitted");

            return false;

        } elseif(!isset($this->FP)) {

            $this->ERROR = "POP3 pass: " . _("connection not established");

            return false;

        } else {

            $reply = $this->send_cmd("PASS $pass");

            if(!$this->is_ok($reply)) {

                $this->ERROR = "POP3 pass: " . _("Authentication failed") . " [$reply]";

                $this->quit();

                return false;

            } else {

                //  Auth successful.

                $count = $this->last("count");

                $this->COUNT = $count;

                return $count;

            }

        }

    }

    function apop ($login,$pass) {

        //  Attempts an APOP login. If this fails, it'll

        //  try a standard login. YOUR SERVER MUST SUPPORT

        //  THE USE OF THE APOP COMMAND!

        //  (apop is optional per rfc1939)

        if(!isset($this->FP)) {

            $this->ERROR = "POP3 apop: " . _("No connection to server");

            return false;

        } elseif(!$this->ALLOWAPOP) {

            $retVal = $this->login($login,$pass);

            return $retVal;

        } elseif(empty($login)) {

            $this->ERROR = "POP3 apop: " . _("No login ID submitted");

            return false;

        } elseif(empty($pass)) {

            $this->ERROR = "POP3 apop: " . _("No password submitted");

            return false;

        } else {

            $banner = $this->BANNER;

            if( (!$banner) or (empty($banner)) ) {

                $this->ERROR = "POP3 apop: " . _("No server banner") . ' - ' . _("abort");

                $retVal = $this->login($login,$pass);

                return $retVal;

            } else {

                $AuthString = $banner;

                $AuthString .= $pass;

                $APOPString = md5($AuthString);

                $cmd = "APOP $login $APOPString";

                $reply = $this->send_cmd($cmd);

                if(!$this->is_ok($reply)) {

                    $this->ERROR = "POP3 apop: " . _("apop authentication failed") . ' - ' . _("abort");

                    $retVal = $this->login($login,$pass);

                    return $retVal;

                } else {

                    //  Auth successful.

                    $count = $this->last("count");

                    $this->COUNT = $count;

                    return $count;

                }

            }

        }

    }

    function login ($login = "", $pass = "") {

        // Sends both user and pass. Returns # of msgs in mailbox or

        // false on failure (or -1, if the error occurs while getting

        // the number of messages.)

        if( !isset($this->FP) ) {

            $this->ERROR = "POP3 login: " . _("No connection to server");

            return false;

        } else {

            $fp = $this->FP;

            if( !$this->user( $login ) ) {

                //  Preserve the error generated by user()

                return false;

            } else {

                $count = $this->pass($pass);

                if( (!$count) || ($count == -1) ) {

                    //  Preserve the error generated by last() and pass()

                    return false;

                } else

                    return $count;

            }

        }

    }

    function top ($msgNum, $numLines = "0") {

        //  Gets the header and first $numLines of the msg body

        //  returns data in an array with each returned line being

        //  an array element. If $numLines is empty, returns

        //  only the header information, and none of the body.

        if(!isset($this->FP)) {

            $this->ERROR = "POP3 top: " . _("No connection to server");

            return false;

        }

        $this->update_timer();

        $fp = $this->FP;

        $buffer = $this->BUFFER;

        $cmd = "TOP $msgNum $numLines";

        fwrite($fp, "TOP $msgNum $numLines\r\n");

        $reply = fgets($fp, $buffer);

        $reply = $this->strip_clf($reply);

        if($this->DEBUG) {

            @error_log("POP3 SEND [$cmd] GOT [$reply]",0);

        }

        if(!$this->is_ok($reply))

        {

            $this->ERROR = "POP3 top: " . _("Error ") . "[$reply]";

            return false;

        }

        $count = 0;

        $MsgArray = array();

        $line = fgets($fp,$buffer);

        while ( !preg_match('/^\.\r\n/',$line))

        {

            $MsgArray[$count] = $line;

            $count++;

            $line = fgets($fp,$buffer);

            if(empty($line))    { break; }

        }

        return $MsgArray;

    }

    function pop_list ($msgNum = "") {

        //  If called with an argument, returns that msgs' size in octets

        //  No argument returns an associative array of undeleted

        //  msg numbers and their sizes in octets

        if(!isset($this->FP))

        {

            $this->ERROR = "POP3 pop_list: " . _("No connection to server");

            return false;

        }

        $fp = $this->FP;

        $Total = $this->COUNT;

        if( (!$Total) or ($Total == -1) )

        {

            return false;

        }

        if($Total == 0)

        {

            return array("0","0");

            // return -1;   // mailbox empty

        }

        $this->update_timer();

        if(!empty($msgNum))

        {

            $cmd = "LIST $msgNum";

            fwrite($fp,"$cmd\r\n");

            $reply = fgets($fp,$this->BUFFER);

            $reply = $this->strip_clf($reply);

            if($this->DEBUG) {

                @error_log("POP3 SEND [$cmd] GOT [$reply]",0);

            }

            if(!$this->is_ok($reply))

            {

                $this->ERROR = "POP3 pop_list: " . _("Error ") . "[$reply]";

                return false;

            }

            list($junk,$num,$size) = preg_split('/\s+/',$reply);

            return $size;

        }

        $cmd = "LIST";

        $reply = $this->send_cmd($cmd);

        if(!$this->is_ok($reply))

        {

            $reply = $this->strip_clf($reply);

            $this->ERROR = "POP3 pop_list: " . _("Error ") .  "[$reply]";

            return false;

        }

        $MsgArray = array();

        $MsgArray[0] = $Total;

        for($msgC=1;$msgC <= $Total; $msgC++)

        {

            if($msgC > $Total) { break; }

            $line = fgets($fp,$this->BUFFER);

            $line = $this->strip_clf($line);

            if(strpos($line, '.') === 0)

            {

                $this->ERROR = "POP3 pop_list: " . _("Premature end of list");

                return false;

            }

            list($thisMsg,$msgSize) = preg_split('/\s+/',$line);

            settype($thisMsg,"integer");

            if($thisMsg != $msgC)

            {

                $MsgArray[$msgC] = "deleted";

            }

            else

            {

                $MsgArray[$msgC] = $msgSize;

            }

        }

        return $MsgArray;

    }

    function get ($msgNum) {

        //  Retrieve the specified msg number. Returns an array

        //  where each line of the msg is an array element.

        if(!isset($this->FP))

        {

            $this->ERROR = "POP3 get: " . _("No connection to server");

            return false;

        }

        $this->update_timer();

        $fp = $this->FP;

        $buffer = $this->BUFFER;

        $cmd = "RETR $msgNum";

        $reply = $this->send_cmd($cmd);

        if(!$this->is_ok($reply))

        {

            $this->ERROR = "POP3 get: " . _("Error ") . "[$reply]";

            return false;

        }

        $count = 0;

        $MsgArray = array();

        $line = fgets($fp,$buffer);

        while ( !preg_match('/^\.\r\n/',$line))

        {

            if ( $line[0] == '.' ) { $line = substr($line,1); }

            $MsgArray[$count] = $line;

            $count++;

            $line = fgets($fp,$buffer);

            if(empty($line))    { break; }

        }

        return $MsgArray;

    }

    function last ( $type = "count" ) {

        //  Returns the highest msg number in the mailbox.

        //  returns -1 on error, 0+ on success, if type != count

        //  results in a popstat() call (2 element array returned)

        $last = -1;

        if(!isset($this->FP))

        {

            $this->ERROR = "POP3 last: " . _("No connection to server");

            return $last;

        }

        $reply = $this->send_cmd("STAT");

        if(!$this->is_ok($reply))

        {