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# EventBufferEvent::sslFilter

(PECL event >= 1.2.6-beta)

EventBufferEvent::sslFilter — Create a new SSL buffer event to send its data over another buffer event

### Description

public static EventBufferEvent EventBufferEvent::sslFilter ( EventBase `$base` , EventBufferEvent `$underlying` , EventSslContext `$ctx` , int `$state` [, int `$options` = 0 ] )

Create a new SSL buffer event to send its data over another buffer event

> Note:

> This function is available only if Event is compiled with OpenSSL support.

### Parameters

`base`

  Associated event base.

`underlying`

  A socket buffer event to use for this SSL.

`ctx`

  Object of EventSslContext class.

`state`

  The current state of SSL connection: `EventBufferEvent::SSL_OPEN` , `EventBufferEvent::SSL_ACCEPTING` or `EventBufferEvent::SSL_CONNECTING` .

`options`

  One or more buffer event options.

### Return Values

Returns a new SSL EventBufferEvent object.

### Examples

Example #1 Simple SMTP server

`<?php
/*
* Author: Andrew Rose <hello at andrewrose dot co dot uk>
*
* Usage:
* 1) Prepare cert.pem certificate and privkey.pem private key files.
* 2) Launch the server script
* 3) Open TLS connection, e.g.:
* $ openssl s_client -connect localhost:25 -starttls smtp -crlf
* 4) Start testing the commands listed in `cmd` method below.
*/
class Handler {
public $domainName = FALSE;
public $connections = [];
public $buffers = [];
public $maxRead = 256000;
public function __construct() {
$this->ctx = new EventSslContext(EventSslContext::SSLv3_SERVER_METHOD, [
EventSslContext::OPT_LOCAL_CERT => 'cert.pem',
EventSslContext::OPT_LOCAL_PK => 'privkey.pem',
//EventSslContext::OPT_PASSPHRASE => '',
EventSslContext::OPT_VERIFY_PEER => false, // change to true with authentic cert
EventSslContext::OPT_ALLOW_SELF_SIGNED => true // change to false with authentic cert
]);
$this->base = new EventBase();
if (!$this->base) {
exit("Couldn't open event base\n");
}
if (!$this->listener = new EventListener($this->base,
[$this, 'ev_accept'],
$this->ctx,
EventListener::OPT_CLOSE_ON_FREE | EventListener::OPT_REUSEABLE,
-1,
'0.0.0.0:25'))
{
exit("Couldn't create listener\n");
}
$this->listener->setErrorCallback([$this, 'ev_error']);
$this->base->dispatch();
}
public function ev_accept($listener, $fd, $address, $ctx) {
static $id = 0;
$id += 1;
$this->connections[$id]['clientData'] = '';
$this->connections[$id]['cnx'] = new EventBufferEvent($this->base, $fd,
EventBufferEvent::OPT_CLOSE_ON_FREE);
if (!$this->connections[$id]['cnx']) {
echo "Failed creating buffer\n";
$this->base->exit(NULL);
exit(1);
}
$this->connections[$id]['cnx']->setCallbacks([$this, "ev_read"], NULL,
[$this, 'ev_error'], $id);
$this->connections[$id]['cnx']->enable(Event::READ | Event::WRITE);
$this->ev_write($id, '220 '.$this->domainName." wazzzap?\r\n");
}
function ev_error($listener, $ctx) {
$errno = EventUtil::getLastSocketErrno();
fprintf(STDERR, "Got an error %d (%s) on the listener. Shutting down.\n",
$errno, EventUtil::getLastSocketError());
if ($errno != 0) {
$this->base->exit(NULL);
exit();
}
}
public function ev_close($id) {
$this->connections[$id]['cnx']->disable(Event::READ | Event::WRITE);
unset($this->connections[$id]);
}
protected function ev_write($id, $string) {
echo 'S('.$id.'): '.$string;
$this->connections[$id]['cnx']->write($string);
}
public function ev_read($buffer, $id) {
while($buffer->input->length > 0) {
$this->connections[$id]['clientData'] .= $buffer->input->read($this->maxRead);
$clientDataLen = strlen($this->connections[$id]['clientData']);
if($this->connections[$id]['clientData'][$clientDataLen-1] == "\n"
&& $this->connections[$id]['clientData'][$clientDataLen-2] == "\r")
{
// remove the trailing \r\n
$line = substr($this->connections[$id]['clientData'], 0,
strlen($this->connections[$id]['clientData']) - 2);
$this->connections[$id]['clientData'] = '';
$this->cmd($buffer, $id, $line);
}
}
}
protected function cmd($buffer, $id, $line) {
switch ($line) {
case strncmp('EHLO ', $line, 4):
$this->ev_write($id, "250-STARTTLS\r\n");
$this->ev_write($id, "250 OK ehlo\r\n");
break;
case strncmp('HELO ', $line, 4):
$this->ev_write($id, "250-STARTTLS\r\n");
$this->ev_write($id, "250 OK helo\r\n");
break;
case strncmp('QUIT', $line, 3):
$this->ev_write($id, "250 OK quit\r\n");
$this->ev_close($id);
break;
case strncmp('STARTTLS', $line, 3):
$this->ev_write($id, "220 Ready to start TLS\r\n");
$this->connections[$id]['cnx'] = EventBufferEvent::sslFilter($this->base,
$this->connections[$id]['cnx'], $this->ctx,
EventBufferEvent::SSL_ACCEPTING,
EventBufferEvent::OPT_CLOSE_ON_FREE);
$this->connections[$id]['cnx']->setCallbacks([$this, "ev_read"], NULL, [$this, 'ev_error'], $id);
$this->connections[$id]['cnx']->enable(Event::READ | Event::WRITE);
break;
default:
echo 'unknown command: '.$line."\n";
break;
}
}
}
new Handler();`

### See Also

- EventBufferEvent::sslSocket() - Creates a new SSL buffer event to send its data over an SSL on a socket

EventBufferEvent::sslError
EventBufferEvent::sslGetCipherInfo
EventBufferEvent
PHP Manual