Minecraft Stats Query

mc-query.py

import json
import struct
import socket

# Minecraft varints are 32-bit signed values
# packed into Google Protobuf varints
# https://gist.github.com/nickelpro/7312782
import struct

def pack_varint(val):
    total = b''
    if val < 0:
        val = (1<<32)+val
    while val>=0x80:
        bits = val&0x7F
        val >>= 7
        total += struct.pack('B', (0x80|bits))
    bits = val&0x7F
    total += struct.pack('B', bits)
    return total
     
def unpack_varint(buff):
    total = 0
    shift = 0
    val = 0x80
    while val&0x80:
        val = struct.unpack('B', buff.recv(1))[0]
        total |= ((val&0x7F)<<shift)
        shift += 7
    if total&(1<<31):
        total = total - (1<<32)
    return total

if __name__ == '__main__':
    host = "66.240.202.11"
    port = 25565
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect((host, port))

    # Build msg
    buf = b''

    # Packet id
    buf += pack_varint(0x00)

    # Data
    buf += pack_varint(4)
    buf += pack_varint(len(host.encode('utf-8')))
    buf += host.encode('utf-8')
    buf += struct.pack('h', port)
    buf += pack_varint(1)

    pkt = b''
    pkt += pack_varint(len(buf))
    pkt += buf
    s.send(pkt)

    buf = b''
    buf += pack_varint(0x00)
    
    pkt = b''
    pkt += pack_varint(len(buf))
    pkt += buf
    s.send(pkt)

    pkt_len = unpack_varint(s)
    pkt_id = unpack_varint(s)
    strlen = unpack_varint(s)
    body = s.recv(strlen, socket.MSG_WAITALL)

    # Cleanup
    s.close()

    data = json.loads(body)
    if 'sample' in data['players']:
        for user in data['players']['sample']:
            print(user['name'])

    print('%d of %d connected' % (data['players']['online'], data['players']['max']))