def encode(self):
payload = self.encrypt(self.payload)
stream = StreamOut(self.settings)
stream.u32(0x32AB9864)
header_version = self.settings.get("pia.header_version")
crypto_enabled = self.settings.get("pia.crypto_enabled")
if header_version > 0:
stream.u8((crypto_enabled << 7) | header_version)
else:
stream.u8(crypto_enabled + 1)
stream.u8(self.connection_id)
stream.u16(self.sequence_id)
if header_version == 0:
stream.u16(self.session_timer)
stream.u16(self.rtt_timer)
if self.settings.get(
"pia.encryption_method") == EncryptionMethod.AES_GCM:
stream.u64(self.nonce)
stream.write(self.signature)
stream.write(payload)
stream.write(self.calc_signature(stream.get()))
return stream.get()
def send_browse_request(self, search_criteria, key, challenge):
stream = StreamOut(self.settings)
stream.add(search_criteria)
buffer = stream.get()
stream = StreamOut(self.settings)
stream.u8(0) #Packet type
stream.u32(len(buffer))
stream.write(buffer)
if self.settings.get("pia.lan_version") != 0:
self.nonce_counter += 1
stream.u8(self.settings.get("pia.lan_version"))
stream.bool(self.settings.get("pia.crypto_enabled"))
stream.u64(self.nonce_counter)
stream.write(key)
if self.settings.get("pia.crypto_enabled"):
challenge = self.generate_challenge(key, challenge)
else:
challenge = secrets.token_bytes(16 + 256)
stream.write(challenge)
self.s.send(stream.get(), self.broadcast)
def send_connection_request(self, station, inverse_id=None):
logger.debug("Sending connection request")
is_inverse = inverse_id is not None
local = self.session.local_station()
local_info = local.connection_info
target_info = station.connection_info
stream = StreamOut(self.settings)
stream.u8(self.MESSAGE_CONNECTION_REQUEST)
stream.u8(station.connection_id_out_temp)
stream.u8(self.version)
stream.bool(is_inverse)
if self.version >= 7:
stream.pid(target_info.local.pid)
if self.version >= 8:
stream.u32(target_info.local.cid)
if is_inverse:
stream.u8(inverse_id)
else:
stream.u8(0)
if self.version == 8:
stream.add(local_info)
else:
stream.add(local_info.local)
message = PIAMessage()
message.protocol_id = self.get_protocol_type()
message.payload = stream.get()
self.resender.send(station, message)
def send_session_reply(self, station, session_info):
logger.debug("Sending session reply")
stream = StreamOut(self.settings)
stream.add(session_info)
data = stream.get()
rand_value = random.randint(0, 0xFFFFFFFF)
fragments = (len(data) - 1) // 800 + 1
for i in range(fragments):
stream = StreamOut(self.settings)
stream.u8(self.MESSAGE_SESSION_REPLY)
stream.pad(11)
stream.u32(rand_value)
stream.u16(self.session_reply_id)
stream.u8(i)
stream.u8(fragments)
body = data[i * 800 : (i + 1) * 800]
stream.u32(len(body))
stream.write(body)
message = PIAMessage()
message.protocol_id = self.get_protocol_type()
message.payload = stream.get()
self.transport.send(station, message)
self.session_reply_id += 1
def send_ack(self, station, ack_id):
logger.debug("Acknowledging packet %i", ack_id)
stream = StreamOut(self.settings)
stream.u8(self.MESSAGE_ACK)
stream.pad(3)
stream.u32(ack_id)
message = PIAMessage()
message.protocol_id = self.get_protocol_type()
message.payload = stream.get()
self.transport.send(station, message)
def send_session_request(self, session_id):
logger.debug("Sending host request")
stream = StreamOut(self.settings)
stream.u8(self.MESSAGE_SESSION_REQUEST)
stream.pad(11)
stream.u32(session_id)
message = PIAMessage()
message.protocol_id = self.get_protocol_type()
message.payload = stream.get()
for port in range(0xC000, 0xC004):
self.transport.broadcast(port, message)
def generate_browse_reply(self, challenge):
stream = StreamOut(self.settings)
stream.add(self.session_info)
buffer = stream.get()
stream = StreamOut(self.settings)
stream.u8(1) #Packet type
stream.u32(len(buffer))
stream.write(buffer)
if self.settings.get("pia.lan_version") != 0:
stream.u8(self.settings.get("pia.lan_version"))
stream.bool(self.settings.get("pia.crypto_enabled"))
stream.write(challenge)
return stream.get()
def send_connection_response(self, station):
logger.debug("Sending connection response")
stream = StreamOut(self.settings)
stream.u8(self.MESSAGE_CONNECTION_RESPONSE)
stream.u8(0)
stream.u8(self.version)
stream.u8(self.platform)
identification = self.session.local_station().identification_info
if self.version < 7:
stream.chars(identification.token.ljust(32, "\0"))
player = identification.players[0]
stream.wchars(player.name.ljust(16, "\0"))
stream.u8(len(player.name))
stream.u8(player.language)
else:
stream.u8(0)
stream.u64(station.connection_info.local.pid)
stream.u32(station.connection_info.local.cid)
stream.chars(identification.token.ljust(32, "\0"))
stream.u32(self.session.get_session_id())
stream.u8(len(identification.players))
stream.u8(identification.participants)
stream.u8(len(identification.players))
for player in identification.players:
stream.write(player.name.encode("utf8").ljust(80, b"\0"))
stream.u8(1)
stream.write(player.nickname.encode("utf8").ljust(40, b"\0"))
stream.u8(1)
stream.u8(player.language)
stream.write(player.play_history_key)
stream.u64(player.info)
stream.pad(0xC3 * (4 - len(identification.players)))
message = PIAMessage()
message.protocol_id = self.get_protocol_type()
message.payload = stream.get()
self.resender.send(station, message)
def send_host_reply(self, station, session_info):
logger.debug("Sending host reply")
stream = StreamOut(self.settings)
stream.u8(self.MESSAGE_HOST_REPLY)
stream.pad(11)
stream.u32(session_info.session_id)
host = self.session.host_station()
if self.settings.get("pia.version") < 51000:
stream.add(host.connection_info)
else:
stream.add(host.connection_info.local)
message = PIAMessage()
message.protocol_id = self.get_protocol_type()
message.payload = stream.get()
for i in range(3):
self.transport.send(station, message)
def send_denying_connection_response(self, station, reason):
logger.debug("Sending denying connection response")
target_location = station.connection_info.local
stream = StreamOut(self.settings)
stream.u8(self.MESSAGE_CONNECTION_RESPONSE)
stream.u8(reason)
stream.u8(self.version)
stream.u8(0)
if self.version >= 8:
stream.u8(0)
stream.u64(target_location.pid)
stream.u32(target_location.cid)
message = PIAMessage()
message.protocol_id = self.get_protocol_type()
message.payload = stream.get()
self.transport.send(station, message)