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#!/usr/bin/env python
"""
Copyright (c) 2006-2025 sqlmap developers (https://sqlmap.org)
See the file 'LICENSE' for copying permission
"""
from __future__ import print_function
import binascii
import os
import re
import socket
import struct
import threading
import time
class DNSQuery(object):
"""
>>> DNSQuery(b'|K\\x01 \\x00\\x01\\x00\\x00\\x00\\x00\\x00\\x01\\x03www\\x06google\\x03com\\x00\\x00\\x01\\x00\\x01\\x00\\x00)\\x10\\x00\\x00\\x00\\x00\\x00\\x00\\x0c\\x00\\n\\x00\\x08O4|Np!\\x1d\\xb3')._query == b"www.google.com."
True
>>> DNSQuery(b'\\x00')._query == b""
True
"""
def __init__(self, raw):
self._raw = raw
self._query = b""
try:
type_ = (ord(raw[2:3]) >> 3) & 15 # Opcode bits
if type_ == 0: # Standard query
i = 12
j = ord(raw[i:i + 1])
while j != 0:
self._query += raw[i + 1:i + j + 1] + b'.'
i = i + j + 1
j = ord(raw[i:i + 1])
except TypeError:
pass
def response(self, resolution):
"""
Crafts raw DNS resolution response packet
"""
retVal = b""
if self._query:
retVal += self._raw[:2] # Transaction ID
retVal += b"\x85\x80" # Flags (Standard query response, No error)
retVal += self._raw[4:6] + self._raw[4:6] + b"\x00\x00\x00\x00" # Questions and Answers Counts
retVal += self._raw[12:(12 + self._raw[12:].find(b"\x00") + 5)] # Original Domain Name Query
retVal += b"\xc0\x0c" # Pointer to domain name
retVal += b"\x00\x01" # Type A
retVal += b"\x00\x01" # Class IN
retVal += b"\x00\x00\x00\x20" # TTL (32 seconds)
retVal += b"\x00\x04" # Data length
retVal += b"".join(struct.pack('B', int(_)) for _ in resolution.split('.')) # 4 bytes of IP
return retVal
class DNSServer(object):
"""
Used for making fake DNS resolution responses based on received
raw request
Reference(s):
https://code.activestate.com/recipes/491264-mini-fake-dns-server/
https://web.archive.org/web/20150418152405/https://code.google.com/p/marlon-tools/source/browse/tools/dnsproxy/dnsproxy.py
"""
def __init__(self):
self._check_localhost()
self._requests = []
self._lock = threading.Lock()
try:
self._socket = socket._orig_socket(socket.AF_INET, socket.SOCK_DGRAM)
except AttributeError:
self._socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self._socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self._socket.bind(("", 53))
self._running = False
self._initialized = False
def _check_localhost(self):
response = b""
try:
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.connect(("", 53))
s.send(binascii.unhexlify("6509012000010000000000010377777706676f6f676c6503636f6d00000100010000291000000000000000")) # A www.google.com
response = s.recv(512)
except:
pass
finally:
if response and b"google" in response:
raise socket.error("another DNS service already running on '0.0.0.0:53'")
def pop(self, prefix=None, suffix=None):
"""
Returns received DNS resolution request (if any) that has given
prefix/suffix combination (e.g. prefix.<query result>.suffix.domain)
"""
retVal = None
if prefix and hasattr(prefix, "encode"):
prefix = prefix.encode()
if suffix and hasattr(suffix, "encode"):
suffix = suffix.encode()
with self._lock:
for _ in self._requests:
if prefix is None and suffix is None or re.search(b"%s\\..+\\.%s" % (prefix, suffix), _, re.I):
self._requests.remove(_)
retVal = _.decode()
break
return retVal
def run(self):
"""
Runs a DNSServer instance as a daemon thread (killed by program exit)
"""
def _():
try:
self._running = True
self._initialized = True
while True:
data, addr = self._socket.recvfrom(1024)
_ = DNSQuery(data)
self._socket.sendto(_.response("127.0.0.1"), addr)
with self._lock:
self._requests.append(_._query)
except KeyboardInterrupt:
raise
finally:
self._running = False
thread = threading.Thread(target=_)
thread.daemon = True
thread.start()
if __name__ == "__main__":
server = None
try:
server = DNSServer()
server.run()
while not server._initialized:
time.sleep(0.1)
while server._running:
while True:
_ = server.pop()
if _ is None:
break
else:
print("[i] %s" % _)
time.sleep(1)
except socket.error as ex:
if 'Permission' in str(ex):
print("[x] Please run with sudo/Administrator privileges")
else:
raise
except KeyboardInterrupt:
os._exit(0)
finally:
if server:
server._running = False
|
