101 lines
3.0 KiB
PHP
101 lines
3.0 KiB
PHP
<?php
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// Very basic WebSocket server in pure PHP
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$host = '0.0.0.0';
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$port = 8080;
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$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
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socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, 1);
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socket_bind($socket, $host, $port);
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socket_listen($socket);
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$clients = [$socket];
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echo "Server started on $host:$port\n";
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while (true) {
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$read = $clients;
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$write = $except = null;
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socket_select($read, $write, $except, null);
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if (in_array($socket, $read)) {
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$new_socket = socket_accept($socket);
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$clients[] = $new_socket;
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$header = socket_read($new_socket, 1024);
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perform_handshake($header, $new_socket, $host, $port);
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echo "New client connected\n";
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$key = array_search($socket, $read);
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unset($read[$key]);
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}
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foreach ($read as $client_socket) {
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$data = socket_read($client_socket, 1024);
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if ($data === false || strlen($data) === 0) {
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$key = array_search($client_socket, $clients);
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unset($clients[$key]);
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socket_close($client_socket);
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echo "Client disconnected\n";
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continue;
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}
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$decoded_data = unmask($data);
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if ($decoded_data) {
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$response = mask(json_encode(['type' => 'message', 'data' => $decoded_data]));
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foreach ($clients as $client) {
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if ($client != $socket) {
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@socket_write($client, $response, strlen($response));
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}
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}
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}
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}
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}
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function perform_handshake($receved_header, $client_conn, $host, $port) {
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$headers = array();
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$lines = preg_split("/\r\n/", $receved_header);
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foreach ($lines as $line) {
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$line = chop($line);
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if (preg_match('/\A(\S+): (.*)\z/', $line, $matches)) {
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$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($secKey . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11')));
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$upgrade = "HTTP/1.1 101 Switching Protocols\r\n" .
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"Upgrade: websocket\r\n" .
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"Connection: Upgrade\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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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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} elseif ($length == 127) {
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$masks = substr($text, 10, 4);
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$data = substr($text, 14);
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} else {
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$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 $text;
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}
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function mask($text) {
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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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