-
Notifications
You must be signed in to change notification settings - Fork 15
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
Showing
2 changed files
with
222 additions
and
171 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,103 +1,126 @@ | ||
import socket | ||
import optparse | ||
# The MIT License (MIT) | ||
# | ||
# Copyright (c) 2014-2016 Leon Jacobs | ||
# | ||
# Permission is hereby granted, free of charge, to any person obtaining a copy | ||
# of this software and associated documentation files (the "Software"), to deal | ||
# in the Software without restriction, including without limitation the rights | ||
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
# copies of the Software, and to permit persons to whom the Software is | ||
# furnished to do so, subject to the following conditions: | ||
# | ||
# The above copyright notice and this permission notice shall be included in all | ||
# copies or substantial portions of the Software. | ||
# | ||
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
# SOFTWARE. | ||
|
||
import getpass | ||
from lib.FrameProcessor import ProcessFrame | ||
import optparse | ||
import socket | ||
|
||
def main(ip, port, out_file, secret): | ||
from lib.FrameProcessor import ProcessFrame | ||
|
||
# setup the socket | ||
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) | ||
sock.bind((ip, port)) | ||
|
||
frameHandler = ProcessFrame() | ||
def main(ip, port, out_file, secret): | ||
# setup the socket | ||
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) | ||
sock.bind((ip, port)) | ||
|
||
# Set the secret if we have one configured | ||
if secret: | ||
frameHandler.setSecret(secret) | ||
frame_handler = ProcessFrame() | ||
|
||
print '[INFO] Fake DNS server listening on', ip, '/', port, 'with a configured secret.' if secret else '' | ||
# Set the secret if we have one configured | ||
if secret: | ||
frame_handler.set_secret(secret) | ||
|
||
# if we have a file destination to write to, set it | ||
if out_file: | ||
frameHandler.setOutfile(out_file) | ||
print '[INFO] Fake DNS server listening on', ip, '/', port, 'with a configured secret.' if secret else '' | ||
|
||
# Start a never ending loop and receive the UDP frames in sock | ||
# From: http://code.activestate.com/recipes/491264-mini-fake-dns-server/ | ||
while True: | ||
# if we have a file destination to write to, set it | ||
if out_file: | ||
frame_handler.set_outfile(out_file) | ||
|
||
# read the socket | ||
data, addr = sock.recvfrom(1024) # buffer size is 1024 bytes | ||
# Start a never ending loop and receive the UDP frames in sock | ||
# From: http://code.activestate.com/recipes/491264-mini-fake-dns-server/ | ||
while True: | ||
|
||
# read the socket | ||
data, addr = sock.recvfrom(1024) # buffer size is 1024 bytes | ||
|
||
# Determine the OPCODE for the query. | ||
op_code = (ord(data[2]) >> 3) & 15 | ||
# Determine the OPCODE for the query. | ||
op_code = (ord(data[2]) >> 3) & 15 | ||
|
||
# OPCODE 0 == Standard query http://www.networksorcery.com/enp/protocol/dns.htm#Opcode | ||
if op_code == 0: | ||
# OPCODE 0 == Standard query http://www.networksorcery.com/enp/protocol/dns.htm#Opcode | ||
if op_code == 0: | ||
|
||
# the raw packet has the name we are querying starting at byte 12 | ||
byte_name_start=12 | ||
byte_name_length=ord(data[byte_name_start]) | ||
domain = '' | ||
# the raw packet has the name we are querying starting at byte 12 | ||
byte_name_start = 12 | ||
byte_name_length = ord(data[byte_name_start]) | ||
domain = '' | ||
|
||
# set the frame to decode, as we are promarily interested in the | ||
# first part of the question | ||
frame_to_decode = data[byte_name_start + 1:byte_name_start + byte_name_length + 1] | ||
# set the frame to decode, as we are promarily interested in the | ||
# first part of the question | ||
frame_to_decode = data[byte_name_start + 1:byte_name_start + byte_name_length + 1] | ||
|
||
# Continue working with the rest of the request and process a response | ||
# we will also lookup the state in ProcessFrame to determine the IP | ||
# response we should be seeing | ||
while byte_name_length != 0: | ||
# Continue working with the rest of the request and process a response | ||
# we will also lookup the state in ProcessFrame to determine the IP | ||
# response we should be seeing | ||
while byte_name_length != 0: | ||
domain += data[byte_name_start + 1:byte_name_start + byte_name_length + 1] + '.' | ||
|
||
domain += data[byte_name_start + 1:byte_name_start + byte_name_length + 1] + '.' | ||
byte_name_start += byte_name_length + 1 | ||
byte_name_length = ord(data[byte_name_start]) | ||
|
||
byte_name_start+= byte_name_length + 1 | ||
byte_name_length=ord(data[byte_name_start]) | ||
print '[INFO] Full resource record query was for:', domain | ||
|
||
print '[INFO] Full resource record query was for:', domain | ||
# send the frame to the processor | ||
frame_handler.set_data(frame_to_decode) | ||
frame_handler.process() | ||
|
||
# send the frame to the processor | ||
frameHandler.setData(frame_to_decode) | ||
frameHandler.process() | ||
# prepare the response packet | ||
response_packet = '' | ||
|
||
# prepare the response packet | ||
response_packet = '' | ||
if domain: | ||
response_packet += data[:2] + "\x81\x80" | ||
response_packet += data[4:6] + data[4:6] + '\x00\x00\x00\x00' # Questions and Answers Counts | ||
response_packet += data[12:] # Original Domain Name Question | ||
response_packet += '\xc0\x0c' # Pointer to domain name | ||
# Response type, ttl and resource data length -> 4 bytes | ||
response_packet += '\x00\x01\x00\x01\x00\x00\x00\x3c\x00\x04' | ||
response_packet += str.join('', map(lambda x: chr(int(x)), '127.0.0.1'.split('.'))) # 4bytes of IP | ||
|
||
if domain: | ||
response_packet+=data[:2] + "\x81\x80" | ||
response_packet+=data[4:6] + data[4:6] + '\x00\x00\x00\x00' # Questions and Answers Counts | ||
response_packet+=data[12:] # Original Domain Name Question | ||
response_packet+='\xc0\x0c' # Pointer to domain name | ||
response_packet+='\x00\x01\x00\x01\x00\x00\x00\x3c\x00\x04' # Response type, ttl and resource data length -> 4 bytes | ||
response_packet+=str.join('',map(lambda x: chr(int(x)), '127.0.0.1'.split('.'))) # 4bytes of IP | ||
sock.sendto(response_packet, addr) | ||
|
||
sock.sendto(response_packet, addr) | ||
|
||
if __name__ == '__main__': | ||
|
||
parser = optparse.OptionParser("usage: %prog -L <ip>") | ||
parser.add_option('-L', '--listen', dest='listen', | ||
type='string', help='specify hostname to listen on') | ||
parser.add_option('-p', '--port', dest='port', default=53, | ||
type='int', help='port number to listen on (Defaults: 53)') | ||
parser.add_option('-O', '--outfile', dest='out', default='', | ||
type='string', help='specify a message file destination') | ||
parser.add_option('-s', '--secret', dest='secret', default=False, | ||
action='store_true', help='Set the secret used for the AES encryption') | ||
parser = optparse.OptionParser("usage: %prog -L <ip>") | ||
parser.add_option('-L', '--listen', dest='listen', | ||
type='string', help='specify hostname to listen on') | ||
parser.add_option('-p', '--port', dest='port', default=53, | ||
type='int', help='port number to listen on (Defaults: 53)') | ||
parser.add_option('-O', '--outfile', dest='out', default='', | ||
type='string', help='specify a message file destination') | ||
parser.add_option('-s', '--secret', dest='secret', default=False, | ||
action='store_true', help='Set the secret used for the AES encryption') | ||
|
||
(options, args) = parser.parse_args() | ||
(options, args) = parser.parse_args() | ||
|
||
if not options.listen: | ||
parser.error('At least a listening IP must be provided.') | ||
if not options.listen: | ||
parser.error('At least a listening IP must be provided.') | ||
|
||
if options.secret: | ||
secret = getpass.getpass(prompt='What is the secret? ') | ||
else: | ||
secret = None | ||
if options.secret: | ||
secret = getpass.getpass(prompt='What is the secret? ') | ||
else: | ||
secret = None | ||
|
||
listening_ip = options.listen | ||
listening_port = options.port | ||
out_file = options.out | ||
listening_ip = options.listen | ||
listening_port = options.port | ||
out_file = options.out | ||
|
||
# kick off the main loop | ||
main(listening_ip, listening_port, out_file, secret) | ||
# kick off the main loop | ||
main(listening_ip, listening_port, out_file, secret) |
Oops, something went wrong.