mirror of
https://github.com/perfect-dark-pc-port/perfect_dark.git
synced 2026-10-23 15:52:41 +02:00
107 lines
2.6 KiB
Python
107 lines
2.6 KiB
Python
#!/usr/bin/env python3
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# simple client for server status queries
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import sys, os, socket, struct, selectors
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DEFAULT_PORT = 27100
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QUERY_MAGIC = b"PDQM\x01"
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MAX_WAIT = 5.0
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def checksum(data):
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crc = 0xFFFF
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for b in data[:-2]:
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x = crc >> 8 ^ b
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x ^= x >> 4
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crc += (crc << 8) ^ (x << 12) ^ (x << 5) ^ x
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crc &= 0xFFFF
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return crc
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def eat_string(data):
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strlen = struct.unpack_from("<H", data)[0]
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strdata = data[2:strlen + 2]
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return strdata[:-1].decode(encoding='utf-8'), data[2 + strlen:]
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if len(sys.argv) < 2:
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print("usage: query <address>[:<port>]")
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sys.exit(1)
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addrstr = sys.argv[1].strip()
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host = addrstr
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port = None
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if addrstr.startswith('[') and ("]:" in addrstr):
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# [ipv6]:port
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host, sep, port = addrstr.rpartition(':')
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elif addrstr.count(':') == 1:
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# possibly ipv4:port or hostname:port
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host, sep, port = addrstr.rpartition(':')
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host = host.strip('[]')
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if port != None:
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port = int(port)
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else:
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port = DEFAULT_PORT
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sockfam = socket.AF_INET
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if ':' in host:
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sockfam = socket.AF_INET6
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sel = selectors.DefaultSelector()
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sock = socket.socket(sockfam, socket.SOCK_DGRAM)
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sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, True)
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sock.settimeout(MAX_WAIT)
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sel.register(sock, selectors.EVENT_READ, None)
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# send query magic to server(s)
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sock.sendto(QUERY_MAGIC, (host, port))
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while True:
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# wait for response
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events = sel.select(1.0) # timeout in seconds
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if not events:
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break
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for (key, mask) in events:
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data, from_addr = sock.recvfrom(256)
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# check magic
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if data[:5] != QUERY_MAGIC:
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print("invalid magic: expected", QUERY_MAGIC, "got", data[:5])
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sys.exit(1)
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# check checksum
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chkremote = struct.unpack("<H", data[-2:])[0]
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chklocal = checksum(data)
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if chkremote != chklocal:
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print("invalid checksum: expected", chklocal, "got", chkremote)
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sys.exit(1)
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# check size
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datalen = struct.unpack("<H", data[5:7])[0]
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if datalen > len(data):
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print("invalid size: expected", len(data), "got", datalen)
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sys.exit(1)
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data = data[7:datalen - 2]
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# unpack fixed size part of the response
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msgdata = struct.unpack_from("<LBBBBB", data)
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# unpack strings from the end of the response
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hostname, data = eat_string(data[9:])
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romname, data = eat_string(data)
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moddir, data = eat_string(data)
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print("address:", from_addr)
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print("protocol ver:", msgdata[0])
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print("in progress:", msgdata[1])
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print("clients: {0}/{1}".format(msgdata[2], msgdata[3]))
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print("stage num:", hex(msgdata[4]))
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print("scenario:", msgdata[5])
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print("host name:", hostname)
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print("rom name:", romname)
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print("mod dir:", moddir)
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print("-"*40)
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