<?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 = $timeout;
if(function_exists("set_time_limit")){
// Extends POP3 request timeout to specified TIMEOUT property.
set_time_limit($timeout);
}
}
return true;
}

/**
* PHP4 constructor.
*/
public function POP3( $server = '', $timeout = '' ) {
self::__construct( $server, $timeout );
}

function update_timer () {
if(function_exists("set_time_limit")){
// Allows additional extension of POP3 request timeout to specified TIMEOUT property when update_timer is called.
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))
{
$this->ERROR = "POP3 last: " . _("Error ") . "[$reply]";
return $last;
}

$Vars = preg_split('/\s+/',$reply);
$count = $Vars[1];
$size = $Vars[2];
settype($count,"integer");
settype($size,"integer");
if($type != "count")
{
return array($count,$size);
}
return $count;
}

function reset () {
// Resets the status of the remote server. This includes
// resetting the status of ALL msgs to not be deleted.
// This method automatically closes the connection to the server.

if(!isset($this->FP))
{
$this->ERROR = "POP3 reset: " . _("No connection to server");
return false;
}
$reply = $this->send_cmd("RSET");
if(!$this->is_ok($reply))
{
// The POP3 RSET command -never- gives a -ERR
// response - if it ever does, something truly
// wild is going on.

$this->ERROR = "POP3 reset: " . _("Error ") . "[$reply]";
@error_log("POP3 reset: ERROR [$reply]",0);
}
$this->quit();
return true;
}

function send_cmd ( $cmd = "" )
{
// Sends a user defined command string to the
// POP server and returns the results. Useful for
// non-compliant or custom POP servers.
// Do NOT include the \r\n as part of your command
// string - it will be appended automatically.

// The return value is a standard fgets() call, which
// will read up to $this->BUFFER bytes of data, until it
// encounters a new line, or EOF, whichever happens first.

// This method works best if $cmd responds with only
// one line of data.

if(!isset($this->FP))
{
$this->ERROR = "POP3 send_cmd: " . _("No connection to server");
return false;
}

if(empty($cmd))
{
$this->ERROR = "POP3 send_cmd: " . _("Empty command string");
return "";
}

$fp = $this->FP;
$buffer = $this->BUFFER;
$this->update_timer();
fwrite($fp,"$cmd\r\n");
$reply = fgets($fp,$buffer);
$reply = $this->strip_clf($reply);
if($this->DEBUG) { @error_log("POP3 SEND [$cmd] GOT [$reply]",0); }
return $reply;
}

function quit() {
// Closes the connection to the POP3 server, deleting
// any msgs marked as deleted.

if(!isset($this->FP))
{
$this->ERROR = "POP3 quit: " . _("connection does not exist");
return false;
}
$fp = $this->FP;
$cmd = "QUIT";
fwrite($fp,"$cmd\r\n");
$reply = fgets($fp,$this->BUFFER);
$reply = $this->strip_clf($reply);
if($this->DEBUG) { @error_log("POP3 SEND [$cmd] GOT [$reply]",0); }
fclose($fp);
unset($this->FP);
return true;
}

function popstat () {
// Returns an array of 2 elements. The number of undeleted
// msgs in the mailbox, and the size of the mbox in octets.

$PopArray = $this->last("array");

if($PopArray == -1) { return false; }

if( (!$PopArray) or (empty($PopArray)) )
{
return false;
}
return $PopArray;
}

function uidl ($msgNum = "")
{
// Returns the UIDL of the msg specified. If called with
// no arguments, returns an associative array where each
// undeleted msg num is a key, and the msg's uidl is the element
// Array element 0 will contain the total number of msgs

if(!isset($this->FP)) {
$this->ERROR = "POP3 uidl: " . _("No connection to server");
return false;
}

$fp = $this->FP;
$buffer = $this->BUFFER;

if(!empty($msgNum)) {
$cmd = "UIDL $msgNum";
$reply = $this->send_cmd($cmd);
if(!$this->is_ok($reply))
{
$this->ERROR = "POP3 uidl: " . _("Error ") . "[$reply]";
return false;
}
list ($ok,$num,$myUidl) = preg_split('/\s+/',$reply);
return $myUidl;
} else {
$this->update_timer();

$UIDLArray = array();
$Total = $this->COUNT;
$UIDLArray[0] = $Total;

if ($Total < 1)
{
return $UIDLArray;
}
$cmd = "UIDL";
fwrite($fp, "UIDL\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))
{
$this->ERROR = "POP3 uidl: " . _("Error ") . "[$reply]";
return false;
}

$line = "";
$count = 1;
$line = fgets($fp,$buffer);
while ( !preg_match('/^\.\r\n/',$line)) {
list ($msg,$msgUidl) = preg_split('/\s+/',$line);
$msgUidl = $this->strip_clf($msgUidl);
if($count == $msg) {
$UIDLArray[$msg] = $msgUidl;
}
else
{
$UIDLArray[$count] = 'deleted';
}
$count++;
$line = fgets($fp,$buffer);
}
}
return $UIDLArray;
}

function delete ($msgNum = "") {
// Flags a specified msg as deleted. The msg will not
// be deleted until a quit() method is called.

if(!isset($this->FP))
{
$this->ERROR = "POP3 delete: " . _("No connection to server");
return false;
}
if(empty($msgNum))
{
$this->ERROR = "POP3 delete: " . _("No msg number submitted");
return false;
}
$reply = $this->send_cmd("DELE $msgNum");
if(!$this->is_ok($reply))
{
$this->ERROR = "POP3 delete: " . _("Command failed ") . "[$reply]";
return false;
}
return true;
}

// *********************************************************

// The following methods are internal to the class.

function is_ok ($cmd = "") {
// Return true or false on +OK or -ERR

if( empty($cmd) )
return false;
else
return( stripos($cmd, '+OK') !== false );
}

function strip_clf ($text = "") {
// Strips \r\n from server responses

if(empty($text))
return $text;
else {
$stripped = str_replace(array("\r","\n"),'',$text);
return $stripped;
}
}

function parse_banner ( $server_text ) {
$outside = true;
$banner = "";
$length = strlen($server_text);
for($count =0; $count < $length; $count++)
{
$digit = substr($server_text,$count,1);
if(!empty($digit)) {
if( (!$outside) && ($digit != '<') && ($digit != '>') )
{
$banner .= $digit;
}
if ($digit == '<')
{
$outside = false;
}
if($digit == '>')
{
$outside = true;
}
}
}
$banner = $this->strip_clf($banner); // Just in case
return "<$banner>";
}

} // End class

// For php4 compatibility
if (!function_exists("stripos")) {
function stripos($haystack, $needle){
return strpos($haystack, stristr( $haystack, $needle ));
}
}