README.md

@@ -20,4 +20,4 @@ Master server written in Python. Replacement for HLMaster
 
 ### Yggdrasil
 
-* `[201:5eb5:f061:678e:7565:6338:c02c:5251]:27010`
+* `[201:23b4:991a:634d:8359:4521:5576:15b7]:27010`

protocol.py

@@ -5,6 +5,8 @@ class MasterProtocol:
 
 	# Server To Master
 	challengeRequest = 'q'
+	addServer = '0'
+	removeServer = 'b'
 
 	# Master To Client
 	queryPacketHeader = b'\xff\xff\xff\xff\x66\x0a'

pymaster.py

@@ -39,6 +39,10 @@ class PyMaster:
                 self.client_query(data, addr)
             case MasterProtocol.challengeRequest:
                 self.send_challenge_to_server(data, addr)
+            case MasterProtocol.addServer:
+                self.add_server_to_list(data, addr)
+            case MasterProtocol.removeServer:
+                self.remove_server_from_list(data, addr)
             case other:
                 logging.debug("Unknown message: {0} from {1}:{2}".format(data, addr[0], addr[1]))
 
@@ -85,31 +89,85 @@ class PyMaster:
             except IndexError:
                 pass
 
+        if clver is None:  # Probably an old vulnerable version
+            self.fake_info_for_old_versions(gamedir, addr)
+            return
+
         packet = MasterProtocol.queryPacketHeader
 
         if key != None: # Required in latest Xash3D version
             packet += b'\x7F' + pack('<I', key) + b'\x00'
 
         for i in self.serverList:
-
-            # Cleanup servers by timeout
             if time() > i.die:
+                logging.debug("Server removed by timeout")
                 self.serverList.remove(i)
-                logging.debug("Server removed by timeout: {0}:{1}".format(addr[0], addr[1]))
                 continue
 
+            if not i.check:
+                logging.debug("Invalid request")
+                continue
+
+            if nat != i.nat:
+                logging.debug("NAT {0} mismatch {1}".format(i.nat, nat))
+                continue
+
+            if gamedir is not None and gamedir != i.gamedir:
+                logging.debug("Game dir {0} mismatch node settings: {1}".format(i.gamedir, gamedir))
+                continue
+
+            if nat:
+                reply = "\xff\xff\xff\xffc {0}:{1}".format(addr[0], addr[1])
+                data = reply.encode("latin_1")
+                # Tell server to send info reply
+                self.sock.sendto(data, i.addr)
+
             # Use pregenerated address string
             packet += i.queryAddr
 
         packet += b"\0\0\0\0\0\0"  # Fill last IP:Port with \0
-
         self.sock.sendto(packet, addr)
 
+
+    def _send_fake_info(sock, warnmsg, gamedir, addr):
+        baseReply = (
+            b"\xff\xff\xff\xffinfo\n\host\\"
+            + warnmsg.encode("utf-8")
+            + b"\map\\update\dm\\0\\team\\0\coop\\0\\numcl\\32\maxcl\\32\\gamedir\\"
+            + gamedir.encode("latin-1")
+            + b"\\"
+        )
+        sock.sendto(baseReply, addr)
+
+
+    def fake_info_for_old_versions(self, gamedir, addr):
+        error_message = [
+            "This version is not",
+            "supported anymore",
+            "Please update Xash3DFWGS",
+            "From GooglePlay or GitHub",
+            "Эта версия",
+            "устарела",
+            "Обновите Xash3DFWGS c",
+            "GooglePlay или GitHub",
+        ]
+
+        for string in error_message:
+            _send_fake_info(self.sock, string, gamedir, addr)
+
+
+    def remove_server_from_list(self, data, addr):
+        for server in self.serverList:
+            if server.addr == addr:
+                logging.debug("Remove Server: from {0}:{1}".format(addr[0], addr[1]))
+                self.serverList.remove(server)
+
+
     def send_challenge_to_server(self, data, addr):
-
-        logging.debug("Challenge request: {0}:{1}".format(addr[0], addr[1]))
-
+        logging.debug("Challenge Request: from {0}:{1}".format(addr[0], addr[1]))
         # At first, remove old server- data from list
+        # self.removeServerFromList(None, addr)
+
         count = 0
         for i in self.serverList:
             if i.addr[0] == addr[0]:
@@ -124,6 +182,7 @@ class PyMaster:
         challenge = random.randint(0, 2**32 - 1)
 
         # Add server to list
+        logging.debug("Added new server {0}:{1} with challenge {2}".format(addr[0], addr[1], challenge))
         self.serverList.append(ServerEntry(addr, challenge))
 
         # And send him a challenge
@@ -131,6 +190,21 @@ class PyMaster:
         packet += pack("I", challenge)
         self.sock.sendto(packet, addr)
 
+
+    def add_server_to_list(self, data, addr):
+        logging.debug("Add Server: from {0}:{1}".format(addr[0], addr[1]))
+        # Remove the header. Just for better parsing.
+        serverInfo = data.strip("\x30\x0a\x5c")
+
+        # Find a server with same address
+        for serverEntry in self.serverList:
+            if serverEntry.addr == addr:
+                logging.debug("Skipped same server address: {0}:{1}".format(addr[0], addr[1]))
+                break
+
+        serverEntry.setInfoString(serverInfo)
+
+
 def spawn_pymaster(verbose, ip, port):
     if verbose:
         logging.getLogger().addHandler(logging.StreamHandler())

server_entry.py

@@ -4,26 +4,85 @@ from struct import pack
 import ipaddress
 
 class ServerEntry:
+	challenge2 = 0
+	gamedir = 'valve'
+	protocol = 0
+	players = 0
+	maxplayers = 0
+	bots = 0
+	gamemap = ''
+	version = '0'
+	servtype = 'd'
+	password = 0
+	os = 'l'
+	secure = 0
+	lan = 0
+	region = 255
+	product = ''
+	nat = 0
+	key = None
+
+	def setInfoString(self, data):
+		infostring = data.replace('\n', '').replace('\r', '').replace('\0', '')
+		split = infostring.split('\\')
+		for i in range(0, len(split), 2):
+			try:
+				value = split[i + 1]
+				if( split[i] == 'challenge' ):
+					self.challenge2 = int(value)
+				elif( split[i] == 'gamedir' ):
+					self.gamedir = value.lower() # keep gamedir lowercase
+				elif( split[i] == 'protocol' ):
+					self.protocol = int(value)
+				elif( split[i] == 'players' ):
+					self.players = int(value)
+				elif( split[i] == 'max' ):
+					self.maxplayers = int(value.split('.')[0])
+				elif( split[i] == 'bots' ):
+					self.bots = int(value)
+				elif( split[i] == 'map' ):
+					self.gamemap = value
+				elif( split[i] == 'version' ):
+					self.version = value
+				elif( split[i] == 'type' ):
+					self.servtype = value
+				elif( split[i] == 'password' ):
+					self.password = value
+				elif( split[i] == 'os' ):
+					self.os = value
+				elif( split[i] == 'secure' ):
+					self.secure = value
+				elif( split[i] == 'lan' ):
+					self.lan = value
+				elif( split[i] == 'region' ):
+					self.region = value
+				elif( split[i] == 'product' ):
+					self.product = value
+				elif( split[i] == 'nat' ):
+					self.nat = int(value)
+				elif split[i] == 'key':
+					self.key = int(value, 16)
+			except IndexError:
+				pass
+		self.check = self.challenge == self.challenge2
+		return self.check
 
 	def __init__(self, addr, challenge):
-
 		# Address
 		self.addr = addr
 		# Shortcuts for generating query
 		self.queryAddr = b''
-
-    if ':' in addr[0]:
 		self.queryAddr += ipaddress.ip_address(addr[0]).packed
-    else:
-      for i in addr[0].split('.'):
-        self.queryAddr += pack('!B', int(i))
-
 		self.queryAddr += pack('!H', int(addr[1]))
 
 		# Random number that server must return
 		self.challenge = challenge
 		self.sentChallengeAt = time()
 
+		# This server is not checked
+		# So it will not get into queries
+		self.check = False
+
 		# Remove server after this time.
 		# This maybe not instant
 		self.die = self.sentChallengeAt + 600