WebSocket connection with PHP - php

Question

I want to connect to webSocket server with PHP, but for some reason do not succeed, but a displays message is "Connected".
PHP:
$host="i[..].herokuapp.com" ;
$port=443;
$timeout=30;
$sk=fsockopen($host,$port,$errnum,$errstr,$timeout) ;
echo $errstr;
if (!is_resource($sk)) {
exit("connection fail: ".$errnum." ".$errstr) ;
} else {
echo "Connected";
fwrite($sk, '{""mi":1,"ertek":"a"}') or die('Error:' . $errno . ':' . $errstr);
fclose($sk);
}
And Nodejs Websocket server:
var WebSocketServer = require("ws").Server;
var http = require("http");
var express = require("express");
var app = express();
var port = process.env.PORT || 5000;
app.use(express.static(__dirname + "/"));
var server = http.createServer(app);
server.listen(port);
var wss = new WebSocketServer({server: server});
wss.on("connection", function(ws) {
[...]
});

Answer 1

This working:
public function __construct() { }
public function __destruct()
{
$this->disconnect();
}
public function sendData($data, $type = 'text', $masked = true, $return = false)
{
if(!$this->_connected)
{
//echo "Not connected";
return false;
}
if( !is_string($data)) {
//echo "Not a string data was given.";
return false;
}
if (strlen($data) == 0)
{
return false;
}
$res = fwrite($this->_Socket, $this->_hybi10Encode($data, $type, $masked));
if($res === 0 || $res === false)
{
return false;
}
$buffer = ' ';
if($return){
while(!empty($buffer))
{
$buffer = fread($this->_Socket, 512);// drop?
}
return $buffer;
}else{
return true;
}
}
public function connect($host, $port = 80, $path = 'into.hu', $origin = true)
{
$this->_host = $host;
$this->_port = $port;
$this->_path = $path;
$this->_origin = $origin;
$key = base64_encode($this->_generateRandomString(16, false, true));
$header = "GET ws://".$host . " HTTP/1.1\r\n";
$header.= "Host: ".$host.":".$port."\r\n";
$header.= "Connection: Upgrade\r\n";
$header.= "Pragma: no-cache\r\n";
$header.= "Cache-Control: no-cache\r\n";
$header.= "Upgrade: websocket\r\n";
$header.= "Sec-WebSocket-Version: 13\r\n";
$header.= "User-Agent: Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.90 Safari/537.36\r\n";
$header.= "Accept-Language: hu,en;q=0.8,en-US;q=0.6,en-AU;q=0.4\r\n";
$header.= "Sec-WebSocket-Key: " . $key . "\r\n";
if($origin !== false)
{
$header.= "Origin: ".$path."\r\n";
$header.= "Sec-WebSocket-Origin: " . $origin . "\r\n";
}
$header.= "Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits\r\n\r\n";
$this->_Socket = fsockopen($host, $port, $errno, $errstr, 2);
//socket_set_timeout($this->_Socket, 0, 10000);
fwrite($this->_Socket, $header);
$response = fread($this->_Socket, 200);
if(!empty($response)){
$this->_connected = true;
}
/*
preg_match('#Sec-WebSocket-Accept:\s(.*)$#mU', $response, $matches);
if ($matches) {
$keyAccept = trim($matches[1]);
$expectedResonse = base64_encode(pack('H*', sha1($key . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11')));
$this->_connected = ($keyAccept === $expectedResonse) ? true : false;
}
*/
return $this->_connected;
}
public function checkConnection()
{
$this->_connected = false;
// send ping:
$data = 'ping?';
#fwrite($this->_Socket, $this->_hybi10Encode($data, 'ping', true));
$response = #fread($this->_Socket, 300);
if(empty($response))
{
return false;
}
$response = $this->_hybi10Decode($response);
if(!is_array($response))
{
return false;
}
if(!isset($response['type']) || $response['type'] !== 'pong')
{
return false;
}
$this->_connected = true;
return true;
}
public function disconnect()
{
$this->_connected = false;
is_resource($this->_Socket) and fclose($this->_Socket);
}
public function reconnect()
{
sleep(2);
$this->_connected = false;
fclose($this->_Socket);
$this->connect($this->_host, $this->_port, $this->_path, $this->_origin);
}
private function _generateRandomString($length = 10, $addSpaces = true, $addNumbers = true)
{
$characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!"§$%&/()=[]{}';
$useChars = array();
// select some random chars:
for($i = 0; $i < $length; $i++)
{
$useChars[] = $characters[mt_rand(0, strlen($characters)-1)];
}
// add spaces and numbers:
if($addSpaces === true)
{
array_push($useChars, ' ', ' ', ' ', ' ', ' ', ' ');
}
if($addNumbers === true)
{
array_push($useChars, rand(0,9), rand(0,9), rand(0,9));
}
shuffle($useChars);
$randomString = trim(implode('', $useChars));
$randomString = substr($randomString, 0, $length);
return $randomString;
}
private function _hybi10Encode($payload, $type = 'text', $masked = true)
{
$frameHead = array();
$frame = '';
$payloadLength = strlen($payload);
switch($type)
{
case 'text':
// first byte indicates FIN, Text-Frame (10000001):
$frameHead[0] = 129;
break;
case 'close':
// first byte indicates FIN, Close Frame(10001000):
$frameHead[0] = 136;
break;
case 'ping':
// first byte indicates FIN, Ping frame (10001001):
$frameHead[0] = 137;
break;
case 'pong':
// first byte indicates FIN, Pong frame (10001010):
$frameHead[0] = 138;
break;
}
// set mask and payload length (using 1, 3 or 9 bytes)
if($payloadLength > 65535)
{
$payloadLengthBin = str_split(sprintf('%064b', $payloadLength), 8);
$frameHead[1] = ($masked === true) ? 255 : 127;
for($i = 0; $i < 8; $i++)
{
$frameHead[$i+2] = bindec($payloadLengthBin[$i]);
}
// most significant bit MUST be 0 (close connection if frame too big)
if($frameHead[2] > 127)
{
$this->close(1004);
return false;
}
}
elseif($payloadLength > 125)
{
$payloadLengthBin = str_split(sprintf('%016b', $payloadLength), 8);
$frameHead[1] = ($masked === true) ? 254 : 126;
$frameHead[2] = bindec($payloadLengthBin[0]);
$frameHead[3] = bindec($payloadLengthBin[1]);
}
else
{
$frameHead[1] = ($masked === true) ? $payloadLength + 128 : $payloadLength;
}
// convert frame-head to string:
foreach(array_keys($frameHead) as $i)
{
$frameHead[$i] = chr($frameHead[$i]);
}
if($masked === true)
{
// generate a random mask:
$mask = array();
for($i = 0; $i < 4; $i++)
{
$mask[$i] = chr(rand(0, 255));
}
$frameHead = array_merge($frameHead, $mask);
}
$frame = implode('', $frameHead);
// append payload to frame:
$framePayload = array();
for($i = 0; $i < $payloadLength; $i++)
{
$frame .= ($masked === true) ? $payload[$i] ^ $mask[$i % 4] : $payload[$i];
}
return $frame;
}
private function _hybi10Decode($data)
{
$payloadLength = '';
$mask = '';
$unmaskedPayload = '';
$decodedData = array();
// estimate frame type:
$firstByteBinary = sprintf('%08b', ord($data[0]));
$secondByteBinary = sprintf('%08b', ord($data[1]));
$opcode = bindec(substr($firstByteBinary, 4, 4));
$isMasked = ($secondByteBinary[0] == '1') ? true : false;
$payloadLength = ord($data[1]) & 127;
switch($opcode)
{
// text frame:
case 1:
$decodedData['type'] = 'text';
break;
case 2:
$decodedData['type'] = 'binary';
break;
// connection close frame:
case 8:
$decodedData['type'] = 'close';
break;
// ping frame:
case 9:
$decodedData['type'] = 'ping';
break;
// pong frame:
case 10:
$decodedData['type'] = 'pong';
break;
default:
return false;
break;
}
if($payloadLength === 126)
{
$mask = substr($data, 4, 4);
$payloadOffset = 8;
$dataLength = bindec(sprintf('%08b', ord($data[2])) . sprintf('%08b', ord($data[3]))) + $payloadOffset;
}
elseif($payloadLength === 127)
{
$mask = substr($data, 10, 4);
$payloadOffset = 14;
$tmp = '';
for($i = 0; $i < 8; $i++)
{
$tmp .= sprintf('%08b', ord($data[$i+2]));
}
$dataLength = bindec($tmp) + $payloadOffset;
unset($tmp);
}
else
{
$mask = substr($data, 2, 4);
$payloadOffset = 6;
$dataLength = $payloadLength + $payloadOffset;
}
if($isMasked === true)
{
for($i = $payloadOffset; $i < $dataLength; $i++)
{
$j = $i - $payloadOffset;
if(isset($data[$i]))
{
$unmaskedPayload .= $data[$i] ^ $mask[$j % 4];
}
}
$decodedData['payload'] = $unmaskedPayload;
}
else
{
$payloadOffset = $payloadOffset - 4;
$decodedData['payload'] = substr($data, $payloadOffset);
}
return $decodedData;
}
}
$WebSocketClient = new WebsocketClient();
$WebSocketClient->connect('i[..].herokuapp.com',80,'valami.hu');
//$WebSocketClient->reconnect();
$WebSocketClient->sendData('üzenet küldés');
unset($WebSocketClient);
?>