151 lines
4.3 KiB
PHP
151 lines
4.3 KiB
PHP
<?php
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$host = 'localhost'; //host
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$port = '9000'; //port
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$null = NULL; //null var
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//Create TCP/IP sream socket
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$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
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//reuseable port
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socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, 1);
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//bind socket to specified host
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socket_bind($socket, 0, $port);
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//listen to port
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socket_listen($socket);
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//create & add listning socket to the list
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$clients = array($socket);
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//start endless loop, so that our script doesn't stop
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while (true) {
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//manage multipal connections
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$changed = $clients;
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//returns the socket resources in $changed array
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socket_select($changed, $null, $null, 0, 10);
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//check for new socket
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if (in_array($socket, $changed)) {
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$socket_new = socket_accept($socket); //accpet new socket
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$clients[] = $socket_new; //add socket to client array
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$header = socket_read($socket_new, 1024); //read data sent by the socket
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perform_handshaking($header, $socket_new, $host, $port); //perform websocket handshake
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socket_getpeername($socket_new, $ip); //get ip address of connected socket
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$response = mask(json_encode(array('type'=>'system', 'message'=>$ip.' connected'))); //prepare json data
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send_message($response); //notify all users about new connection
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//make room for new socket
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$found_socket = array_search($socket, $changed);
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unset($changed[$found_socket]);
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}
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//loop through all connected sockets
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foreach ($changed as $changed_socket) {
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//check for any incomming data
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while(socket_recv($changed_socket, $buf, 1024, 0) >= 1)
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{
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$received_text = unmask($buf); //unmask data
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$tst_msg = json_decode($received_text, true); //json decode
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$user_name = $tst_msg['name']; //sender name
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$user_message = $tst_msg['message']; //message text
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$user_color = $tst_msg['color']; //color
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//prepare data to be sent to client
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$response_text = mask(json_encode(array('type'=>'usermsg', 'name'=>$user_name, 'message'=>$user_message, 'color'=>$user_color)));
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send_message($response_text); //send data
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break 2; //exist this loop
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}
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$buf = @socket_read($changed_socket, 1024, PHP_NORMAL_READ);
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if ($buf === false) { // check disconnected client
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// remove client for $clients array
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$found_socket = array_search($changed_socket, $clients);
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socket_getpeername($changed_socket, $ip);
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unset($clients[$found_socket]);
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//notify all users about disconnected connection
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$response = mask(json_encode(array('type'=>'system', 'message'=>$ip.' disconnected')));
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send_message($response);
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}
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}
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}
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// close the listening socket
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socket_close($socket);
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function send_message($msg)
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{
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global $clients;
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foreach($clients as $changed_socket)
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{
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@socket_write($changed_socket,$msg,strlen($msg));
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}
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return true;
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}
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//Unmask incoming framed message
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function unmask($text) {
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$length = ord($text[1]) & 127;
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if($length == 126) {
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$masks = substr($text, 4, 4);
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$data = substr($text, 8);
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}
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elseif($length == 127) {
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$masks = substr($text, 10, 4);
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$data = substr($text, 14);
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}
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else {
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$masks = substr($text, 2, 4);
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$data = substr($text, 6);
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}
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$text = "";
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for ($i = 0; $i < strlen($data); ++$i) {
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$text .= $data[$i] ^ $masks[$i%4];
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}
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return $text;
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}
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//Encode message for transfer to client.
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function mask($text)
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{
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$b1 = 0x80 | (0x1 & 0x0f);
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$length = strlen($text);
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if($length <= 125)
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$header = pack('CC', $b1, $length);
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elseif($length > 125 && $length < 65536)
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$header = pack('CCn', $b1, 126, $length);
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elseif($length >= 65536)
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$header = pack('CCNN', $b1, 127, $length);
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return $header.$text;
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}
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//handshake new client.
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function perform_handshaking($receved_header,$client_conn, $host, $port)
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{
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$headers = array();
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$lines = preg_split("/\r\n/", $receved_header);
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foreach($lines as $line)
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{
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$line = chop($line);
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if(preg_match('/\A(\S+): (.*)\z/', $line, $matches))
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{
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$headers[$matches[1]] = $matches[2];
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}
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}
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$secKey = $headers['Sec-WebSocket-Key'];
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$secAccept = base64_encode(pack('H*', sha1($secKey . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11')));
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//hand shaking header
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$upgrade = "HTTP/1.1 101 Web Socket Protocol Handshake\r\n" .
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"Upgrade: websocket\r\n" .
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"Connection: Upgrade\r\n" .
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"WebSocket-Origin: $host\r\n" .
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"WebSocket-Location: ws://$host:$port/demo/shout.php\r\n".
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"Sec-WebSocket-Accept:$secAccept\r\n\r\n";
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socket_write($client_conn,$upgrade,strlen($upgrade));
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}
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