How to send WebSocket hybi-17 frame with php server - php

Question

I try to implement a WebSocket Server in PHP handshaking and recieving data works well but if i try to send data to the client, Chrome 19 says
"A server must not mask any frames that it sends to the client."
But I don't mask the data.
My code looks like this:
function wrap($msg=""){
$byte1 = 0x80 | (0x1 & 0x0f);
if(strlen($msg) <= 125){
$header = pack('CC', $byte1, strlen($msg));
}
elseif(strlen($msg) >= 126 && strlen($msg) <= 65535){
$header = pack('CCn', $byte1, 126, strlen($msg));
}
else{
$header = pack('CCN', $byte1, 126, strlen($msg));
}
$this->log($header);
return $header.$msg;
}
I send it to the Client using socket_write()
EDIT: Firefox 13 closes the connection too

Answer 1

I had the same problem: for some messages sent from the server there was no response in the browser, for some the error "A server must not mask any frames ..." was displayed, though I did not add any mask.
The reason was in the handshake sent.
The handshake was:
"HTTP/1.1 101 Web Socket Protocol Handshake\r\n" .
...
"WebSocket-Location: ws://{$host}{$resource}\r\n\r\n" . chr(0)
That chr(0) was the reason, after I removed it everything works.
function for encoding the messages:
protected 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('', $frameHead);
// append payload to frame:
for ($i = 0; $i < $payloadLength; $i++) {
$frame .= ($masked === true) ? $payload[$i] ^ $mask[$i % 4] : $payload[$i];
}
return $frame;
}