306 lines
14 KiB
Python
306 lines
14 KiB
Python
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from .packet import Packet
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from .EnumQuery import EnumQuery
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from .EnumResponse import EnumResponse
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from .CFrame import CFrame
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from .DFrame import DFrame
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from giants.masterserver import MasterServer
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from .session import Session
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import socket
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import threading
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import traceback
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import uuid
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from utils.logger import setup_logger
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from giants.player import Player
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logger = setup_logger(__name__)
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class Netserver:
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def __init__(self, server):
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self.socket = None
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self.statssocket = None
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self.server = server
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self.addrs = []
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self.guid = uuid.uuid4().bytes
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def run(self):
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self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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self.socket.bind((self.server.listen_ip, self.server.listen_port))
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logger.debug("Listening to %s:%s", self.server.listen_ip, self.server.listen_port)
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gameserverthread = threading.Thread(target=self.handle_packets)
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gameserverthread.start()
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#ms = MasterServer(self.server)
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#statsserverthread = threading.Thread(target=ms.register_and_run)
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#statsserverthread.start()
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gameserverthread.join()
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#statsserverthread.join()
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def handle_packets(self):
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while True:
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data, addr = self.socket.recvfrom(1024)
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logger.debug("%s:%s > %s", addr[0], addr[1], data.hex())
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self.handle_new_packet(addr, data)
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def handle_new_packet(self, addr, bData):
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pPacket = Packet(bData)
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first = pPacket.getByte()
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if len(bData) >= 4 and first & DFrame.PACKET_COMMAND_DATA:
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self.handle_new_dframe(addr, pPacket)
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elif len(bData) >= 12 and first & CFrame.PACKET_COMMAND_FRAME:
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self.handle_new_cframe(addr, pPacket)
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elif first == EnumQuery.LEAD or first == EnumResponse.LEAD:
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self.handle_new_enum(addr, pPacket)
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else:
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logger.error("Unknown frame received")
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return
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def handle_new_enum(self, addr, data):
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# EnumQuery or EnumResponse
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second = data.getByte()
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if second == EnumQuery.COMMAND:
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# EnumQuery
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try:
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eq = EnumQuery(data)
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logger.debug("Got EnumQuery, sending EnumResponse")
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er = EnumResponse()
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er.Payload = eq.Payload
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er.ApplicationDescSize = 0x50
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er.ApplicationDescFlags = 0x41
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er.MaxPlayers = self.server.maxplayers
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er.CurrentPlayers = len(self.server.players)
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er.SessionName = self.server.name
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er.ApplicationInstanceGUID = self.guid
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er.ApplicationGUID = eq.ApplicationGUID
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er.ApplicationReservedData = b'\xff' # Map ID
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er.ApplicationReservedData += b'\x00\x04\x00'
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er.ApplicationReservedData += b'\xd9\x05' # game version
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er.ApplicationReservedData += b'\x02\x92\x05\x00\x01\x00\x00\x00\x00\x00' # Unknown
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er.ApplicationReservedData += b'\x9c\x53\xf4\xdd' # Seems to be a checksum of current map
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# \x00\x00\x00\x00: [None]
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# \x00\x00\x00\x01: <custom map>
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# \x9c\x53\xf4\xdd: Three Way Island - Canyons
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# \x1e\xe9\x39\xe1: Still Winter
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er.ApplicationReservedData += self.server.currentmap.mapname.encode("ascii")
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er.ApplicationReservedData += b'\x00' * (32 - len(self.server.currentmap.mapname))
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self.send_packet(addr, er.to_packet())
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except Exception:
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logger.error("Could not parse EnumQuery or forge EnumResponse: ")
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traceback.print_exc()
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return
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elif second == EnumResponse.COMMAND:
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# wait what? ignore that shit
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return
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else:
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logger.error("Unknown DPLHP command: %s", second)
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def handle_new_cframe(self, addr, data):
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try:
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cframe = CFrame(data)
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session = self.get_session(addr)
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if cframe.ExtOpCode == CFrame.FRAME_EXOPCODE_CONNECT:
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# CONNECT CFRAME
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if session and session.Full:
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logger.error("Session %s:%s was already fully connected. Ignoring.", session.ip, session.port)
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return
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elif session and not session.Full and session.SessID == cframe.SessID:
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# send CONNECTED
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logger.debug("Already partially established connection. Sending a CFRAME CONNECTED again.")
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session.send_cframe_connected(cframe)
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#session.setup_Connect_Retry_Timer()
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return
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if not self.server.accept_new_players:
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# ignore new players
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return
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else:
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logger.debug("New connection. Sending a CFRAME CONNECTED.")
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session = Session(self.socket)
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session.SessID = cframe.SessID
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session.ip = addr[0]
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session.port = addr[1]
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self.addrs.append(session)
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session.send_cframe_connected(cframe)
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#session.setup_Connect_Retry_Timer()
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elif cframe.ExtOpCode == CFrame.FRAME_EXOPCODE_CONNECTED:
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# CONNECTED CFRAME
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# check if already sent a CONNECT packet
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logger.debug("%s:%s sent back a CONNECTED CFrame.", session.ip, session.port)
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if not session:
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logger.error("%s sent a CONNECTED opcode without having sent a CONNECT before. GTFO.", addr)
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return
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if not cframe.SessID == session.SessID or cframe.Command & CFrame.PACKET_COMMAND_POLL:
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logger.error("Sent a CONNECTED packet with incorrect SessID or had COMMAND_POLL")
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return
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session.Full = True # fully connected
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session.cancel_Connect_Retry_Timer()
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elif cframe.ExtOpCode == CFrame.FRAME_EXOPCODE_SACK:
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if not session or not session.Full:
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logger.error("Received a SACK packet for a non fully connected session")
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return
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sack_sent = False
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if not cframe.NSeq == session.next_expected_seq:
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logger.error("Received CFRAME (%s) does not have the same NSeq (%s). Did we miss a packet?", cframe.NSeq, session.next_expected_seq)
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if not sack_sent:
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session.send_cframe_sack()
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sack_sent = True
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if not session.CFRAME_NRcv == cframe.NRecv:
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logger.error("Received CFRAME (%s) does not have same NRcv (%s). One sent packet might have been lost.", cframe.NRecv, session.CFRAME_NRcv)
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if not sack_sent:
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session.send_cframe_sack()
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sack_sent = True
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# WIP: The bNSeq, bNRcv, optional selective acknowledgment (SACK), and optional send mask fields are then processed by using the standard rules in sections 3.1.5.2.1 through 3.1.5.2.4
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# TODO: A successfully validated SACK packet SHOULD count as a valid receive and thus restart the KeepAlive timer
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if cframe.Command & CFrame.PACKET_COMMAND_POLL:
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if not session:
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logger.error("Received a POLL packet for a non fully connected session")
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return
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logger.debug("Got a CFrame POLL. Replying with a SACK.")
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# must send back a ACK
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session.send_cframe_sack()
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except Exception:
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logger.error("Should have been a CFRAME but could not parse it")
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traceback.print_exc()
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return
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def handle_new_dframe(self, addr, data):
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try:
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dframe = DFrame(data)
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logger.debug("Received DFRAME")
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session = next((x for x in self.addrs if x.ip == addr[0] and x.port == addr[1]), None)
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if not session:
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logger.debug("%s sent a DFRAME without having sent a CONNECT before. GTFO.", addr)
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logger.debug(self.addrs)
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return
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if not dframe.Seq == session.next_expected_seq:
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logger.error("%s unexpected SEQ. Got %s, expected %s", addr, dframe.Seq, session.next_expected_seq)
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#return
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if dframe.Control & DFrame.PACKET_CONTROL_END_STREAM:
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if not session:
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logger.error("Received a END STREAM packet for a non fully connected session")
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return
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# disconnect
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resp = DFrame()
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resp.Command = DFrame.PACKET_COMMAND_DATA | DFrame.PACKET_COMMAND_NEW_MSG | DFrame.PACKET_COMMAND_END_MSG | DFrame.PACKET_COMMAND_RELIABLE | DFrame.PACKET_COMMAND_SEQUENTIAL
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resp.Control = DFrame.PACKET_CONTROL_END_STREAM
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resp.Seq = dframe.NRcv
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resp.NRcv = session.next_send
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session.send(resp)
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session.send_cframe_sack()
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# TODO: broadcast session has disconnected
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self.addrs.remove(session)
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return
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session.next_expected_seq += 1
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if dframe.Payload:
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self.handle_game_packet(session, dframe.Payload)
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else:
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pass
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except Exception as e:
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logger.error("Could not parse DFRAME: ")
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traceback.print_exc()
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return
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def handle_game_packet(self, session, payload):
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logger.debug("Payload: %s", payload)
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if payload[0] == 0xc1:
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# connect frame?
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_ = payload[0:4]
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_ = payload[4:8]
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_ = payload[8:12]
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_ = payload[12:16]
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_ = payload[16:20]
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_ = payload[20:52]
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instanceguid = payload[52:68]
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gameguid = payload[68:84]
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_ = payload[84:88]
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_ = payload[88:92]
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name = payload[92:]
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name = name.decode("utf-16-le")[0:-1]
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logger.debug("%s connected!", name)
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player = Player(name, session)
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self.server.new_player(player)
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session.send_dframe_keepalive()
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r = DFrame()
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r.Command = DFrame.PACKET_COMMAND_DATA | DFrame.PACKET_COMMAND_RELIABLE | DFrame.PACKET_COMMAND_SEQUENTIAL | DFrame.PACKET_COMMAND_POLL | DFrame.PACKET_COMMAND_NEW_MSG | DFrame.PACKET_COMMAND_END_MSG | DFrame.PACKET_COMMAND_USER_1
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r.Control = 0x00
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r.Seq = session.next_send
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r.NRcv = session.next_expected_seq
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payload = Packet()
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payload.putLong(0xc2) # C2 = response to a C1 connection?
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payload.putLong(0x00) # unknown
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payload.putLong(0x00) # unknown
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payload.putLong(0x50) # unknown - 80
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payload.putLong(0x41) # unknown - 65
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payload.putLong(0x14) # max players
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payload.putLong(0x02) # current players
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payload.write(b'\x0e\x01\x00\x00') # unknown - 3585 - or \x16\x01\x00\x00
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payload.putLong(len((self.server.name + "\x00").encode("utf-16-le"))) # SERVERNAME LENGTH
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for _ in range(4):
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payload.putLong(0) # unknown
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payload.putLong(0xda) # unknown - 218 - or 0xe2
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payload.putLong(0x34) # unknown - 52
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payload.write(self.guid) # instance guid
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payload.write(
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b"\x10\x5e\x62\xa7\x96\x1a\xd2\x11\x9a\xfc\x00\x60\x08\x45\xe5\x71") # app guid
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payload.write(b'\x40\xf5\x62\xe1')
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payload.putLong(0x21) # unknown - 33
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payload.putLong(0x00) # unknown
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payload.putLong(0x02) # unknown - 2
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payload.putLong(0x00)
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payload.write(b'\x45\xf5\x52\xe3')
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payload.putLong(0x00)
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payload.write(b'\x02\x04\x00\x00') # unknown
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payload.putLong(0x02) # unknown - 2
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payload.putLong(0x00) # unknown
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payload.putLong(0x07) # unknown - 7
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for _ in range(6):
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payload.putLong(0) # unknown
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payload.write(b'\x40\xf5\x62\xe1') # unknown - 1089823457
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payload.putLong(0x00) # unknown
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payload.write(b'\x00\x02\x00\x00') # unknown - ?
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payload.putLong(0x21) # unknown - 33
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payload.putLong(0x00) # unknown - 0
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payload.putLong(0x07) # unknown - 7
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payload.putLong(0xcc) # unknown - 204
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payload.putLong(0x0e) # unknown - 6
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for _ in range(4):
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payload.putLong(0) # unknown
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payload.write((name + "\x00").encode("utf-16-le"))
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payload.write(b'\xff') # map ID
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payload.write(b'\x01\x01\x00')
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#payload.write(b'\x00\x04\x00')
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payload.write(b'\xd9\x05') # game version
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payload.write(b'\x02\x92\x05\x00\x01\x00\x00\x00\x00\x00') # Unknown
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payload.write(b'\x9c\x53\xf4\xde') # Seems to be a checksum of current map
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payload.write(self.server.currentmap.mapname.encode("ascii"))
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payload.putLong(0x00) # ??
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payload.write((self.server.name + "\x00").encode("utf-16-le"))
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r.Payload = payload.getvalue()
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session.send(r)
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if payload[0] == 0xc3:
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self.server.broadcast_message(name + " is a dick.")
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def send_packet(self, addr, packet):
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self.socket.sendto(packet.getvalue(), addr)
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logger.debug("%s:%s < %s", addr[0], addr[1], packet.getvalue().hex())
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def get_session(self, iporaddr, port=None):
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if not port:
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return next((x for x in self.addrs if x.ip == iporaddr[0] and x.port == iporaddr[1]), None)
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else:
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return next((x for x in self.addrs if x.ip == iporaddr and x.port == port), None)
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