This is an example of how to set up stream_socket_server to connect with multiple Secure Websockets on WSS (wss://) that uses SSL / TLS as a Transport.
This runs on a Windows Apache Server with a registered domain and SSL Cert from LetsEncrypt via Certbot.
Run this script from a console "php server.php", and javascript html as a client with:
socket = new WebSocket('wss://php.net:1234');
<?php
$host = '192.168.1.2';
$port = 1234;
$path = 'C:/Certbot/live/php.net/';
$transport = 'tlsv1.3';
$ssl = ['ssl' => [
'local_cert' => $path . 'cert.pem', 'local_pk' => $path . 'privkey.pem', 'disable_compression' => true, 'verify_peer' => false, 'ssltransport' => $transport, ] ];
$ssl_context = stream_context_create($ssl);
$server = stream_socket_server($transport . '://' . $host . ':' . $port, $errno, $errstr, STREAM_SERVER_BIND|STREAM_SERVER_LISTEN, $ssl_context);
if (!$server) { die("$errstr ($errno)"); }
$clients = array($server);
$write = NULL;
$except = NULL;
while (true) {
$changed = $clients;
stream_select($changed, $write, $except, 10);
if (in_array($server, $changed)) {
$client = @stream_socket_accept($server);
if (!$client){ continue; }
$clients[] = $client;
$ip = stream_socket_get_name( $client, true );
echo "New Client connected from $ip\n";
stream_set_blocking($client, true);
$headers = fread($client, 1500);
handshake($client, $headers, $host, $port);
stream_set_blocking($client, false);
send_message($clients, mask($ip . ' connected'));
$found_socket = array_search($server, $changed);
unset($changed[$found_socket]);
}
foreach ($changed as $changed_socket) {
$ip = stream_socket_get_name( $changed_socket, true );
$buffer = stream_get_contents($changed_socket);
if ($buffer == false) {
echo "Client Disconnected from $ip\n";
@fclose($changed_socket);
$found_socket = array_search($changed_socket, $clients);
unset($clients[$found_socket]);
}
$unmasked = unmask($buffer);
if ($unmasked != "") { echo "\nReceived a Message from $ip:\n\"$unmasked\" \n"; }
$response = mask($unmasked);
send_message($clients, $response);
}
}
fclose($server);
function unmask($text) {
$length = @ord($text[1]) & 127;
if($length == 126) { $masks = substr($text, 4, 4); $data = substr($text, 8); }
elseif($length == 127) { $masks = substr($text, 10, 4); $data = substr($text, 14); }
else { $masks = substr($text, 2, 4); $data = substr($text, 6); }
$text = "";
for ($i = 0; $i < strlen($data); ++$i) { $text .= $data[$i] ^ $masks[$i % 4]; }
return $text;
}
function mask($text) {
$b1 = 0x80 | (0x1 & 0x0f);
$length = strlen($text);
if($length <= 125)
$header = pack('CC', $b1, $length);
elseif($length > 125 && $length < 65536)
$header = pack('CCn', $b1, 126, $length);
elseif($length >= 65536)
$header = pack('CCNN', $b1, 127, $length);
return $header.$text;
}
function handshake($client, $rcvd, $host, $port){
$headers = array();
$lines = preg_split("/\r\n/", $rcvd);
foreach($lines as $line)
{
$line = rtrim($line);
if(preg_match('/\A(\S+): (.*)\z/', $line, $matches)){
$headers[$matches[1]] = $matches[2];
}
}
$secKey = $headers['Sec-WebSocket-Key'];
$secAccept = base64_encode(pack('H*', sha1($secKey . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11')));
$upgrade = "HTTP/1.1 101 Web Socket Protocol Handshake\r\n" .
"Upgrade: websocket\r\n" .
"Connection: Upgrade\r\n" .
"WebSocket-Origin: $host\r\n" .
"WebSocket-Location: wss://$host:$port\r\n".
"Sec-WebSocket-Version: 13\r\n" .
"Sec-WebSocket-Accept:$secAccept\r\n\r\n";
fwrite($client, $upgrade);
}
function send_message($clients, $msg){
foreach($clients as $changed_socket){
@fwrite($changed_socket, $msg);
}
}
?>
