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| 1 | <?php declare(strict_types=1); |
| 2 | |
| 3 | /** |
| 4 | * Clansuite Server Query |
| 5 | * |
| 6 | * SPDX-FileCopyrightText: 2003-2025 Jens A. Koch |
| 7 | * SPDX-License-Identifier: MIT |
| 8 | * |
| 9 | * For the full copyright and license information, please view |
| 10 | * the LICENSE file that was distributed with this source code. |
| 11 | */ |
| 12 | |
| 13 | namespace Clansuite\ServerQuery\ServerProtocols; |
| 14 | |
| 15 | use function array_filter; |
| 16 | use function chr; |
| 17 | use function count; |
| 18 | use function explode; |
| 19 | use function fclose; |
| 20 | use function fread; |
| 21 | use function fsockopen; |
| 22 | use function fwrite; |
| 23 | use function is_array; |
| 24 | use function is_string; |
| 25 | use function json_decode; |
| 26 | use function ord; |
| 27 | use function pack; |
| 28 | use function random_int; |
| 29 | use function stream_set_timeout; |
| 30 | use function strlen; |
| 31 | use function substr; |
| 32 | use Clansuite\Capture\Protocol\ProtocolInterface; |
| 33 | use Clansuite\Capture\ServerAddress; |
| 34 | use Clansuite\Capture\ServerInfo; |
| 35 | use Clansuite\ServerQuery\CSQuery; |
| 36 | use Override; |
| 37 | |
| 38 | /** |
| 39 | * Minecraft server protocol implementation. |
| 40 | * |
| 41 | * The SLP protocol does not provide server variables or rules. |
| 42 | * These are only available through the Legacy Query protocol, |
| 43 | * which requires the server administrator to explicitly enable |
| 44 | * query in server.properties with enable-query=true. |
| 45 | * |
| 46 | * Protocols: |
| 47 | * - SLP (Serer List Ping) provides only basic infos. |
| 48 | * - Legacy Query: More detailed server variables. |
| 49 | * |
| 50 | * @see https://minecraft.wiki/w/Query |
| 51 | */ |
| 52 | class Minecraft extends CSQuery implements ProtocolInterface |
| 53 | { |
| 54 | /** |
| 55 | * Protocol name. |
| 56 | */ |
| 57 | public string $name = 'Minecraft'; |
| 58 | |
| 59 | /** |
| 60 | * List of supported games. |
| 61 | */ |
| 62 | public array $supportedGames = ['Minecraft']; |
| 63 | |
| 64 | /** |
| 65 | * Protocol identifier. |
| 66 | */ |
| 67 | public string $protocol = 'minecraft'; |
| 68 | |
| 69 | /** |
| 70 | * Constructor. |
| 71 | * |
| 72 | * @param $address Server address |
| 73 | * @param $queryport Query port |
| 74 | * @param $protocolVersion Protocol version to use: 'slp' (Server List Ping) or 'legacy' (Legacy Query) |
| 75 | */ |
| 76 | public function __construct(?string $address = null, ?int $queryport = null, public string $protocolVersion = 'slp') |
| 77 | { |
| 78 | parent::__construct($address, $queryport); |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * Query server information. |
| 83 | */ |
| 84 | #[Override] |
| 85 | public function query_server(bool $getPlayers = true, bool $getRules = true): bool |
| 86 | { |
| 87 | if ($this->online) { |
| 88 | $this->reset(); |
| 89 | } |
| 90 | |
| 91 | if ($this->protocolVersion === 'legacy') { |
| 92 | return $this->queryLegacy(); |
| 93 | } |
| 94 | |
| 95 | return $this->querySLP(); |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * query method. |
| 100 | */ |
| 101 | #[Override] |
| 102 | public function query(ServerAddress $addr): ServerInfo |
| 103 | { |
| 104 | $this->address = $addr->ip; |
| 105 | $this->queryport = $addr->port; |
| 106 | $this->query_server(true, true); |
| 107 | |
| 108 | return new ServerInfo( |
| 109 | address: $this->address, |
| 110 | queryport: $this->queryport, |
| 111 | online: $this->online, |
| 112 | gamename: $this->gamename, |
| 113 | gameversion: $this->gameversion, |
| 114 | servertitle: $this->servertitle, |
| 115 | mapname: $this->mapname, |
| 116 | gametype: $this->gametype, |
| 117 | numplayers: $this->numplayers, |
| 118 | maxplayers: $this->maxplayers, |
| 119 | rules: $this->rules, |
| 120 | players: $this->players, |
| 121 | errstr: $this->errstr, |
| 122 | ); |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * getProtocolName method. |
| 127 | */ |
| 128 | #[Override] |
| 129 | public function getProtocolName(): string |
| 130 | { |
| 131 | return $this->protocol; |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * getVersion method. |
| 136 | */ |
| 137 | #[Override] |
| 138 | public function getVersion(ServerInfo $info): string |
| 139 | { |
| 140 | return $info->gameversion ?? 'unknown'; |
| 141 | } |
| 142 | |
| 143 | /** |
| 144 | * Query using Legacy Query protocol (UDP). |
| 145 | */ |
| 146 | private function queryLegacy(): bool |
| 147 | { |
| 148 | $address = (string) $this->address; |
| 149 | $port = (int) $this->queryport; |
| 150 | |
| 151 | // Generate session ID |
| 152 | $sessionId = random_int(1, 0x7FFFFFFF); |
| 153 | // Send handshake |
| 154 | $handshake = pack('c3N', 0xFE, 0xFD, 0x09, $sessionId); |
| 155 | $response = $this->sendCommand($address, $port, $handshake); |
| 156 | |
| 157 | if ($response === false || strlen($response) < 5) { |
| 158 | $this->errstr = 'No handshake response from Minecraft server'; |
| 159 | |
| 160 | return false; |
| 161 | } |
| 162 | |
| 163 | // Parse challenge token |
| 164 | if ($response[0] !== chr(0x09)) { |
| 165 | $this->errstr = 'Invalid handshake response'; |
| 166 | |
| 167 | return false; |
| 168 | } |
| 169 | $challengeToken = (int) substr($response, 1, -1); |
| 170 | // Send full query |
| 171 | $fullQuery = pack('c3N', 0xFE, 0xFD, 0x00, $sessionId) . |
| 172 | pack('N', $challengeToken) . |
| 173 | pack('c2', 0x00, 0x00); |
| 174 | $response = $this->sendCommand($address, $port, $fullQuery); |
| 175 | |
| 176 | if ($response === false || strlen($response) < 5) { |
| 177 | $this->errstr = 'No query response from Minecraft server'; |
| 178 | |
| 179 | return false; |
| 180 | } |
| 181 | |
| 182 | // Parse response |
| 183 | if ($response[0] !== chr(0x00)) { |
| 184 | $this->errstr = 'Invalid query response'; |
| 185 | |
| 186 | return false; |
| 187 | } |
| 188 | $this->parseLegacyResponse(substr($response, 1)); |
| 189 | $this->online = true; |
| 190 | |
| 191 | return true; |
| 192 | } |
| 193 | |
| 194 | /** |
| 195 | * Query using Server List Ping (TCP JSON). |
| 196 | */ |
| 197 | private function querySLP(): bool |
| 198 | { |
| 199 | $host = (string) $this->address; |
| 200 | $port = (int) $this->queryport; |
| 201 | |
| 202 | $errno = 0; |
| 203 | $errstr = ''; |
| 204 | |
| 205 | $fp = @fsockopen($host, $port, $errno, $errstr, 5); |
| 206 | |
| 207 | if ($fp === false) { |
| 208 | $this->errstr = 'Unable to connect to Minecraft server'; |
| 209 | |
| 210 | return false; |
| 211 | } |
| 212 | stream_set_timeout($fp, 5); |
| 213 | // Send handshake |
| 214 | $handshake = $this->buildHandshakePacket(); |
| 215 | fwrite($fp, $handshake); |
| 216 | // Send status request |
| 217 | $statusRequest = $this->buildStatusRequestPacket(); |
| 218 | fwrite($fp, $statusRequest); |
| 219 | // Read response |
| 220 | $response = $this->readPacket($fp); |
| 221 | |
| 222 | if ($response === false) { |
| 223 | fclose($fp); |
| 224 | $this->errstr = 'No response from Minecraft server'; |
| 225 | |
| 226 | return false; |
| 227 | } |
| 228 | $ptr = 1; |
| 229 | // Skip ID |
| 230 | $jsonLength = $this->readVarIntFromString($response, $ptr); |
| 231 | $json = substr($response, $ptr, $jsonLength); |
| 232 | $data = json_decode($json, true); |
| 233 | |
| 234 | if ($data === null) { |
| 235 | fclose($fp); |
| 236 | $this->errstr = 'Invalid JSON response'; |
| 237 | |
| 238 | return false; |
| 239 | } |
| 240 | |
| 241 | if (!is_array($data)) { |
| 242 | fclose($fp); |
| 243 | $this->errstr = 'Invalid JSON response structure'; |
| 244 | |
| 245 | return false; |
| 246 | } |
| 247 | |
| 248 | $this->parseSLPResponse($data); |
| 249 | $this->online = true; |
| 250 | fclose($fp); |
| 251 | |
| 252 | return true; |
| 253 | } |
| 254 | |
| 255 | private function buildHandshakePacket(): string |
| 256 | { |
| 257 | $handshakeData = pack('c', 0) . // Packet ID |
| 258 | $this->writeVarInt(0) . // Protocol version 0 |
| 259 | $this->writeString((string) $this->address) . // Server address |
| 260 | pack('n', (int) $this->queryport) . // Server port |
| 261 | pack('c', 1); // Next state (status) |
| 262 | |
| 263 | return $this->writeVarInt(strlen($handshakeData)) . $handshakeData; |
| 264 | } |
| 265 | |
| 266 | private function buildStatusRequestPacket(): string |
| 267 | { |
| 268 | $data = pack('c', 0); // Packet ID |
| 269 | |
| 270 | return $this->writeVarInt(strlen($data)) . $data; |
| 271 | } |
| 272 | |
| 273 | /** |
| 274 | * @param resource $fp |
| 275 | */ |
| 276 | private function readPacket(mixed $fp): false|string |
| 277 | { |
| 278 | $length = $this->readVarInt($fp); |
| 279 | |
| 280 | if ($length === false || $length <= 0) { |
| 281 | return false; |
| 282 | } |
| 283 | |
| 284 | $data = ''; |
| 285 | |
| 286 | while (strlen($data) < $length) { |
| 287 | /** @phpstan-ignore argument.type */ |
| 288 | $chunk = fread($fp, $length - strlen($data)); |
| 289 | |
| 290 | if ($chunk === false || $chunk === '') { |
| 291 | return false; |
| 292 | } |
| 293 | $data .= $chunk; |
| 294 | } |
| 295 | |
| 296 | return $data; |
| 297 | } |
| 298 | |
| 299 | /** |
| 300 | * @param array<mixed> $data |
| 301 | */ |
| 302 | private function parseSLPResponse(array $data): void |
| 303 | { |
| 304 | $description = $data['description'] ?? ''; |
| 305 | |
| 306 | if (is_array($description)) { |
| 307 | // Handle formatted text objects |
| 308 | $this->servertitle = $this->parseFormattedText($description); |
| 309 | } else { |
| 310 | $this->servertitle = (string) $description; |
| 311 | } |
| 312 | |
| 313 | $playersData = $data['players'] ?? []; |
| 314 | |
| 315 | if (is_array($playersData)) { |
| 316 | $this->numplayers = (int) ($playersData['online'] ?? 0); |
| 317 | $this->maxplayers = (int) ($playersData['max'] ?? 0); |
| 318 | |
| 319 | if (isset($playersData['sample']) && is_array($playersData['sample'])) { |
| 320 | $this->players = []; |
| 321 | |
| 322 | foreach ($playersData['sample'] as $player) { |
| 323 | if (is_array($player)) { |
| 324 | $this->players[] = [ |
| 325 | 'name' => (string) ($player['name'] ?? ''), |
| 326 | 'id' => (string) ($player['id'] ?? ''), |
| 327 | ]; |
| 328 | } |
| 329 | } |
| 330 | } |
| 331 | } |
| 332 | |
| 333 | $versionData = $data['version'] ?? []; |
| 334 | |
| 335 | if (is_array($versionData)) { |
| 336 | $this->gameversion = (string) ($versionData['name'] ?? ''); |
| 337 | } |
| 338 | } |
| 339 | |
| 340 | private function parseLegacyResponse(string $data): void |
| 341 | { |
| 342 | // Split by null bytes |
| 343 | $parts = explode("\0", $data); |
| 344 | $parts = array_filter($parts, static fn (string $v): bool => $v !== ''); // Remove empty parts |
| 345 | |
| 346 | $this->rules = []; |
| 347 | |
| 348 | for ($i = 0; $i < count($parts); $i += 2) { |
| 349 | $key = $parts[$i] ?? ''; |
| 350 | $value = $parts[$i + 1] ?? ''; |
| 351 | |
| 352 | // Map to standard fields |
| 353 | switch ($key) { |
| 354 | case 'hostname': |
| 355 | $this->servertitle = $value; |
| 356 | |
| 357 | break; |
| 358 | |
| 359 | case 'gametype': |
| 360 | $this->gametype = $value; |
| 361 | |
| 362 | break; |
| 363 | |
| 364 | case 'game_id': |
| 365 | $this->gamename = $value; |
| 366 | |
| 367 | break; |
| 368 | |
| 369 | case 'version': |
| 370 | $this->gameversion = $value; |
| 371 | |
| 372 | break; |
| 373 | |
| 374 | case 'plugins': |
| 375 | // Parse plugins if present |
| 376 | $this->rules['plugins'] = $value; |
| 377 | |
| 378 | break; |
| 379 | |
| 380 | case 'map': |
| 381 | $this->mapname = $value; |
| 382 | |
| 383 | break; |
| 384 | |
| 385 | case 'numplayers': |
| 386 | $this->numplayers = (int) $value; |
| 387 | |
| 388 | break; |
| 389 | |
| 390 | case 'maxplayers': |
| 391 | $this->maxplayers = (int) $value; |
| 392 | |
| 393 | break; |
| 394 | |
| 395 | case 'hostport': |
| 396 | $this->hostport = (int) $value; |
| 397 | |
| 398 | break; |
| 399 | |
| 400 | default: |
| 401 | $this->rules[$key] = $value; |
| 402 | |
| 403 | break; |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | // Players are not provided in legacy query basic response |
| 408 | $this->players = []; |
| 409 | } |
| 410 | |
| 411 | private function writeVarInt(int $value): string |
| 412 | { |
| 413 | $result = ''; |
| 414 | |
| 415 | do { |
| 416 | $byte = $value & 0x7F; |
| 417 | $value >>= 7; |
| 418 | |
| 419 | if ($value !== 0) { |
| 420 | $byte |= 0x80; |
| 421 | } |
| 422 | $result .= chr($byte); |
| 423 | } while ($value !== 0); |
| 424 | |
| 425 | return $result; |
| 426 | } |
| 427 | |
| 428 | /** |
| 429 | * @param resource $fp |
| 430 | */ |
| 431 | private function readVarInt(mixed $fp): false|int |
| 432 | { |
| 433 | $value = 0; |
| 434 | $shift = 0; |
| 435 | |
| 436 | while (true) { |
| 437 | $byte = fread($fp, 1); |
| 438 | |
| 439 | if ($byte === false || $byte === '') { |
| 440 | return false; |
| 441 | } |
| 442 | |
| 443 | $byte = ord($byte); |
| 444 | $value |= ($byte & 0x7F) << $shift; |
| 445 | $shift += 7; |
| 446 | |
| 447 | if ((($byte & 0x80) === 0)) { |
| 448 | break; |
| 449 | } |
| 450 | |
| 451 | if ($shift >= 35) { |
| 452 | return false; // VarInt too big |
| 453 | } |
| 454 | } |
| 455 | |
| 456 | return $value; |
| 457 | } |
| 458 | |
| 459 | private function readVarIntFromString(string $buffer, int &$ptr): int |
| 460 | { |
| 461 | $value = 0; |
| 462 | $shift = 0; |
| 463 | |
| 464 | while (true) { |
| 465 | $byte = ord($buffer[$ptr++]); |
| 466 | $value |= ($byte & 0x7F) << $shift; |
| 467 | $shift += 7; |
| 468 | |
| 469 | if ((($byte & 0x80) === 0)) { |
| 470 | break; |
| 471 | } |
| 472 | |
| 473 | if ($shift >= 35) { |
| 474 | return 0; // Error |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | return $value; |
| 479 | } |
| 480 | |
| 481 | private function writeString(string $string): string |
| 482 | { |
| 483 | return $this->writeVarInt(strlen($string)) . $string; |
| 484 | } |
| 485 | |
| 486 | /** |
| 487 | * @param array<mixed> $textObject |
| 488 | */ |
| 489 | private function parseFormattedText(array $textObject): string |
| 490 | { |
| 491 | $text = (string) ($textObject['text'] ?? ''); |
| 492 | |
| 493 | $extra = $textObject['extra'] ?? null; |
| 494 | |
| 495 | if (is_array($extra)) { |
| 496 | foreach ($extra as $item) { |
| 497 | if (is_array($item) && isset($item['text'])) { |
| 498 | $text .= (string) ($item['text'] ?? ''); |
| 499 | } elseif (is_string($item)) { |
| 500 | $text .= $item; |
| 501 | } |
| 502 | } |
| 503 | } |
| 504 | |
| 505 | return $text; |
| 506 | } |
| 507 | } |