Minecraft Stats Query

mc-query.php

<?php

// Settings
$hostname = "66.240.202.11";
$port = 25565;

// Based off of https://github.com/winny-/mcstat/blob/master/mcstat.php
// with updated reading of the key-value and username portions.

$sess_id = rand(1, 0xFFFFFFFF) & 0x0F0F0F0F;

// Set up a UDP socket
$fp = stream_socket_client('udp://' . $hostname . ':' . $port, $errno, $errmsg);
stream_set_timeout($fp, 5);

// Set initial time
$time = microtime(true);

// Handshake
$req = pack('cccN', 0xFE, 0xFD, 9, $sess_id);
fwrite($fp, $req);

// Read handshake response and get the token
$resp = fread($fp, 2048);
if (strpos($resp, 9) !== 0 && (int)substr($resp, 1, 4) === $sess_id) {
	error_log("Invalid handshake response");
	exit(1);
}

// The chalenge token will be found here
$token = substr($resp, 5, -1);

// Update time
$time = round((microtime(true)-$time)*1000);

// Issue request
$stat_req = pack('cccNNN', 0xFE, 0xFD, 0, $sess_id, $token, 0);
fwrite($fp, $stat_req);

$stat_header = fread($fp, 5);
if (strpos($resp, 0) !== 0 && (int)substr($resp, 1, 4) === $sess_id) {
	error_log("Invalid stat header response");
	exit(1);
}

fread($fp, 11);

// Set default values
$stats = array();
$stats['players'] = array();
$stats['latency'] = $time;
$stats['numplayers'] = 0;
$stats['maxplayers'] = 20;

// This data comes as follows:
// key1\0val1\0key2\0val2\0\0
//
// States:
// 0: reading key
// 1: reading val
// 2: done
$state = 0;
$key = '';
$val = '';

while ($state < 2) {
	$c = fread($fp, 1);

	if ($state == 0) {
		if ($c === chr(0) || $c === false) {
			if (strlen($key) == 0) {
				$state = 2;
			} else {
				$state = 1;
			}
		} else {
			$key .= $c;
		}
	} else {
		if ($c === chr(0) || $c === false) {
			if ($key == 'port') {
				$val = (string)$val;
			}
			$stats[$key] = $val;
			$key = '';
			$val = '';
			$state = 0;
		} else {
			$val .= $c;
		}
	}
}

// Skip the 10 bytes of padding
fread($fp, 10);

// This data comes as follows:
// player1\0player2\0\0
$state = 0;
$val = '';
while ($state < 1) {
	$c = fread($fp, 1);
	if ($c === chr(0) || $c === false) {
		if (strlen($val) == 0) {
			$state = 2;
		} else {
			$stats['players'][] = $val;
			$val = '';
		}
	} else {
		$val .= $c;
	}
}

foreach ($stats['players'] as $player) {
	echo $player . "\n";
}
echo $stats['numplayers'] . " of " . $stats['maxplayers'] . " connected\n";

?>