Fixed bug when IPv6 is disabled via GRUB.

Responder.py

@@ -69,6 +69,8 @@ settings.Config.ExpandIPRanges()
 #Create the DB, before we start Responder.
 CreateResponderDb()
 
+Have_IPv6 = settings.Config.IPv6
+
 class ThreadingUDPServer(ThreadingMixIn, UDPServer):
 	def server_bind(self):
 		if OsInterfaceIsSupported():
@@ -78,9 +80,11 @@ class ThreadingUDPServer(ThreadingMixIn, UDPServer):
 				else:
 					if (sys.version_info > (3, 0)):
 						self.socket.setsockopt(socket.SOL_SOCKET, 25, bytes(settings.Config.Interface+'\0', 'utf-8'))
+						if Have_IPv6:
 							self.socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, False)
 					else:
 						self.socket.setsockopt(socket.SOL_SOCKET, 25, settings.Config.Interface+'\0')
+						if Have_IPv6:
 							self.socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, False)
 			except:
 				pass
@@ -95,9 +99,11 @@ class ThreadingTCPServer(ThreadingMixIn, TCPServer):
 				else:
 					if (sys.version_info > (3, 0)):
 						self.socket.setsockopt(socket.SOL_SOCKET, 25, bytes(settings.Config.Interface+'\0', 'utf-8'))
+						if Have_IPv6:
 							self.socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, False)
 					else:
 						self.socket.setsockopt(socket.SOL_SOCKET, 25, settings.Config.Interface+'\0')
+						if Have_IPv6:
 							self.socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, False)
 			except:
 				pass
@@ -112,9 +118,11 @@ class ThreadingTCPServerAuth(ThreadingMixIn, TCPServer):
 				else:
 					if (sys.version_info > (3, 0)):
 						self.socket.setsockopt(socket.SOL_SOCKET, 25, bytes(settings.Config.Interface+'\0', 'utf-8'))
+						if Have_IPv6:
 							self.socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, False)
 					else:
 						self.socket.setsockopt(socket.SOL_SOCKET, 25, settings.Config.Interface+'\0')
+						if Have_IPv6:
 							self.socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, False)
 			except:
 				pass
@@ -131,9 +139,11 @@ class ThreadingUDPMDNSServer(ThreadingMixIn, UDPServer):
 
 		#IPV6:
 		if (sys.version_info > (3, 0)):
+			if Have_IPv6:
 				mreq = socket.inet_pton(socket.AF_INET6, MADDR6) + struct.pack('@I', if_nametoindex2(settings.Config.Interface))
 				self.socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_JOIN_GROUP, mreq)
 		else:
+			if Have_IPv6:
 				mreq = socket.inet_pton(socket.AF_INET6, MADDR6) + struct.pack('@I', if_nametoindex2(settings.Config.Interface))
 				self.socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_JOIN_GROUP, mreq)
 		if OsInterfaceIsSupported():
@@ -143,9 +153,11 @@ class ThreadingUDPMDNSServer(ThreadingMixIn, UDPServer):
 				else:
 					if (sys.version_info > (3, 0)):
 						self.socket.setsockopt(socket.SOL_SOCKET, 25, bytes(settings.Config.Interface+'\0', 'utf-8'))
+						if Have_IPv6:
 							self.socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, False)
 					else:
 						self.socket.setsockopt(socket.SOL_SOCKET, 25, settings.Config.Interface+'\0')
+						if Have_IPv6:
 							self.socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, False)
 			except:
 				pass
@@ -160,6 +172,7 @@ class ThreadingUDPLLMNRServer(ThreadingMixIn, UDPServer):
 		Join = self.socket.setsockopt(socket.IPPROTO_IP,socket.IP_ADD_MEMBERSHIP,socket.inet_aton(MADDR) + settings.Config.IP_aton)
 
 		#IPV6:
+		if Have_IPv6:
 			mreq = socket.inet_pton(socket.AF_INET6, MADDR6) + struct.pack('@I', if_nametoindex2(settings.Config.Interface))
 			self.socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_JOIN_GROUP, mreq)
 		if OsInterfaceIsSupported():
@@ -169,9 +182,11 @@ class ThreadingUDPLLMNRServer(ThreadingMixIn, UDPServer):
 				else:
 					if (sys.version_info > (3, 0)):
 						self.socket.setsockopt(socket.SOL_SOCKET, 25, bytes(settings.Config.Interface+'\0', 'utf-8'))
+						if Have_IPv6:
 							self.socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, False)
 					else:
 						self.socket.setsockopt(socket.SOL_SOCKET, 25, settings.Config.Interface+'\0')
+						if Have_IPv6:
 							self.socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, False)
 			except:
 				pass
@@ -179,18 +194,23 @@ class ThreadingUDPLLMNRServer(ThreadingMixIn, UDPServer):
 		
 
 ThreadingUDPServer.allow_reuse_address = 1
+if Have_IPv6:
 	ThreadingUDPServer.address_family = socket.AF_INET6
 
 ThreadingTCPServer.allow_reuse_address = 1
+if Have_IPv6:
 	ThreadingTCPServer.address_family = socket.AF_INET6
 
 ThreadingUDPMDNSServer.allow_reuse_address = 1
+if Have_IPv6:
 	ThreadingUDPMDNSServer.address_family = socket.AF_INET6
 
 ThreadingUDPLLMNRServer.allow_reuse_address = 1
+if Have_IPv6:
 	ThreadingUDPLLMNRServer.address_family = socket.AF_INET6
 
 ThreadingTCPServerAuth.allow_reuse_address = 1
+if Have_IPv6:
 	ThreadingTCPServerAuth.address_family = socket.AF_INET6
 
 def serve_thread_udp_broadcast(host, port, handler):

poisoners/LLMNR.py

@@ -22,6 +22,9 @@ if (sys.version_info > (3, 0)):
 else:
 	from SocketServer import BaseRequestHandler
 
+#Should we answer to those AAAA?
+Have_IPv6 = settings.Config.IPv6
+
 def Parse_LLMNR_Name(data):
 	import codecs
 	NameLen = data[12]
@@ -86,7 +89,7 @@ class LLMNR(BaseRequestHandler):  # LLMNR Server class
 							'AnalyzeMode': '0',
 							})
 
-				elif LLMNRType == 'IPv6':
+				elif LLMNRType == 'IPv6' and Have_IPv6:
 					Buffer1 = LLMNR6_Ans(Tid=NetworkRecvBufferPython2or3(data[0:2]), QuestionName=Name, AnswerName=Name)
 					Buffer1.calculate()
 					soc.sendto(NetworkSendBufferPython2or3(Buffer1), self.client_address)

poisoners/MDNS.py

@@ -23,6 +23,9 @@ else:
 from packets import MDNS_Ans, MDNS6_Ans
 from utils import *
 
+#Should we answer to those AAAA?
+Have_IPv6 = settings.Config.IPv6
+
 def Parse_MDNS_Name(data):
 	try:
 		if (sys.version_info > (3, 0)):
@@ -82,7 +85,7 @@ class MDNS(BaseRequestHandler):
 						'AnalyzeMode': '0',
 						})
 
-			elif MDNSType == 'IPv6':  # Poisoning Mode
+			elif MDNSType == 'IPv6'and Have_IPv6:  # Poisoning Mode
 				Poisoned_Name = Poisoned_MDNS_Name(data)
 				Buffer = MDNS6_Ans(AnswerName = Poisoned_Name)
 				Buffer.calculate()

servers/DNS.py

@@ -21,6 +21,9 @@ if settings.Config.PY2OR3 == "PY3":
 else:
 	from SocketServer import BaseRequestHandler
 
+#Should we answer to those AAAA?
+Have_IPv6 = settings.Config.IPv6
+
 def ParseDNSType(data):
 	QueryTypeClass = data[len(data)-4:]
 	OPT = data[len(data)-22:len(data)-20]
@@ -65,14 +68,14 @@ class DNS(BaseRequestHandler):
 				ResolveName = re.sub('[^0-9a-zA-Z]+', '.', buff.fields["QuestionName"])
 				print(color("[*] [DNS] SRV Record poisoned answer sent to: %-15s  Requested name: %s" % (self.client_address[0].replace("::ffff:",""), ResolveName), 2, 1))
 
-			if ParseDNSType(NetworkRecvBufferPython2or3(data)) == "IPv6":
+			if ParseDNSType(NetworkRecvBufferPython2or3(data)) == "IPv6" and Have_IPv6:
 				buff = DNS6_Ans()
 				buff.calculate(NetworkRecvBufferPython2or3(data))
 				soc.sendto(NetworkSendBufferPython2or3(buff), self.client_address)
 				ResolveName = re.sub('[^0-9a-zA-Z]+', '.', buff.fields["QuestionName"])
 				print(color("[*] [DNS] AAAA Record poisoned answer sent to: %-15s  Requested name: %s" % (self.client_address[0].replace("::ffff:",""), ResolveName), 2, 1))
 
-			if ParseDNSType(NetworkRecvBufferPython2or3(data)) == "OPTIPv6":
+			if ParseDNSType(NetworkRecvBufferPython2or3(data)) == "OPTIPv6" and Have_IPv6:
 				buff = DNS6_Ans()
 				buff.calculate(NetworkRecvBufferPython2or3(data))
 				soc.sendto(NetworkSendBufferPython2or3(buff), self.client_address)
@@ -113,14 +116,14 @@ class DNSTCP(BaseRequestHandler):
 				ResolveName = re.sub('[^0-9a-zA-Z]+', '.', buff.fields["QuestionName"])
 				print(color("[*] [DNS] SRV Record poisoned answer sent: %-15s  Requested name: %s" % (self.client_address[0].replace("::ffff:",""), ResolveName), 2, 1))
 
-			if ParseDNSType(NetworkRecvBufferPython2or3(data)) == "IPv6":
+			if ParseDNSType(NetworkRecvBufferPython2or3(data)) == "IPv6" and Have_IPv6:
 				buff = DNS6_Ans()
 				buff.calculate(NetworkRecvBufferPython2or3(data))
 				self.request.send(NetworkSendBufferPython2or3(buff))
 				ResolveName = re.sub('[^0-9a-zA-Z]+', '.', buff.fields["QuestionName"])
 				print(color("[*] [DNS] AAAA Record poisoned answer sent: %-15s  Requested name: %s" % (self.client_address[0].replace("::ffff:",""), ResolveName), 2, 1))
 
-			if ParseDNSType(NetworkRecvBufferPython2or3(data)) == "OPTIPv6":
+			if ParseDNSType(NetworkRecvBufferPython2or3(data)) == "OPTIPv6" and Have_IPv6:
 				buff = DNS6_AnsOPT()
 				buff.calculate(NetworkRecvBufferPython2or3(data))
 				self.request.send(NetworkSendBufferPython2or3(buff))

settings.py

@@ -168,6 +168,9 @@ class Settings:
 		self.ExternalIP6        = options.ExternalIP6
 		self.Quiet_Mode			= options.Quiet
 
+		#Do we have IPv6 for real?
+		self.IPv6 = utils.Probe_IPv6_socket()
+			
 		if self.Interface == "ALL":
 			self.Bind_To_ALL  = True
 		else:

utils.py

@@ -219,6 +219,14 @@ def FindLocalIP(Iface, OURIP):
 		print(color("[!] Error: %s: Interface not found" % Iface, 1))
 		sys.exit(-1)
 
+def Probe_IPv6_socket():
+	"""Return true is IPv6 sockets are really supported, and False when IPv6 is not supported."""
+	try:
+		with socket.socket(socket.AF_INET6, socket.SOCK_STREAM) as s:
+			s.bind(("::1", 0))
+			return True
+	except:
+		return False
 		
 def FindLocalIP6(Iface, OURIP):
 	if Iface == 'ALL':
@@ -234,7 +242,6 @@ def FindLocalIP6(Iface, OURIP):
 				s = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
 				s.connect((randIP+':80', 1))
 				IP = s.getsockname()[0]
-				print('IP is: %s'%IP)
 				return IP
 			except:
 				try: