#!/usr/bin/php
<?php
$socket = stream_socket_server("tcp://0.0.0.0:8000", $errno, $errstr);
if (!$socket) {
die("$errstr ($errno)\n");
}
$connects = array();
while (true) {
//формируем массив прослушиваемых сокетов:
$read = $connects;
$read []= $socket;
$write = $except = null;
if (!stream_select($read, $write, $except, null)) {//ожидаем сокеты доступные для чтения (без таймаута)
break;
}
if (in_array($socket, $read)) {//есть новое соединение
//принимаем новое соединение и производим рукопожатие:
if (($connect = stream_socket_accept($socket, -1)) && $info = handshake($connect)) {
$connects[] = $connect;//добавляем его в список необходимых для обработки
onOpen($connect, $info);//вызываем пользовательский сценарий
}
unset($read[ array_search($socket, $read) ]);
}
foreach($read as $connect) {//обрабатываем все соединения
$data = fread($connect, 100000);
if (!$data) { //соединение было закрыто
fclose($connect);
unset($connects[ array_search($connect, $connects) ]);
onClose($connect);//вызываем пользовательский сценарий
continue;
}
onMessage($connect, $data,$info);//вызываем пользовательский сценарий
}
}
fclose($server);
function handshake($connect) {
$info = array();
$line = fgets($connect);
$header = explode(' ', $line);
$info['method'] = $header[0];
$info['uri'] = $header[1];
//считываем заголовки из соединения
while ($line = rtrim(fgets($connect))) {
if (preg_match('/\A(\S+): (.*)\z/', $line, $matches)) {
$info[$matches[1]] = $matches[2];
} else {
break;
}
}
$address = explode(':', stream_socket_get_name($connect, true)); //получаем адрес клиента
$info['ip'] = $address[0];
$info['port'] = $address[1];
if (empty($info['Sec-WebSocket-Key'])) {
return false;
}
//отправляем заголовок согласно протоколу вебсокета
$SecWebSocketAccept = base64_encode(pack('H*', sha1($info['Sec-WebSocket-Key'] . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11')));
$upgrade = "HTTP/1.1 101 Web Socket Protocol Handshake\r\n" .
"Upgrade: websocket\r\n" .
"Connection: Upgrade\r\n" .
"Sec-WebSocket-Accept:$SecWebSocketAccept\r\n\r\n";
fwrite($connect, $upgrade);
return $info;
}
function encode($payload, $type = 'text', $masked = false){
$frameHead = array();
$payloadLength = strlen($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
if ($frameHead[2] > 127) {
return array('type' => '', 'payload' => '', 'error' => 'frame too large (1004)');
}
} elseif ($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 $frame;
}
function decode($data){
$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;
// unmasked frame is received:
if (!$isMasked) {
return array('type' => '', 'payload' => '', 'error' => 'protocol error (1002)');
}
switch ($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:
$decodedData['type'] = 'pong';
break;
default:
return array('type' => '', 'payload' => '', 'error' => 'unknown opcode (1003)');
}
if ($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 + $payloadOffset;
}
/**
* We have to check for large frames here. socket_recv cuts at 1024 bytes
* so if websocket-frame is > 1024 bytes we have to wait until whole
* data is transferd.
*/
if (strlen($data) < $dataLength) {
return false;
}
if ($isMasked) {
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 $decodedData;
}
//пользовательские сценарии:
function onOpen($connect, $info) {
echo "open\n";
var_dump($info);
fwrite($connect, encode('Соединение установлено!'));
}
function onClose($connect) {
echo "close\n";
}
function onMessage($connect, $data,$info) {
var_dump($info);
echo decode($data)['payload'] . "\n";
fwrite($connect, encode('так'));
}
