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https://github.com/sqlmapproject/sqlmap.git
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138 lines
3.7 KiB
Python
138 lines
3.7 KiB
Python
#!/usr/bin/env python
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"""
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$Id$
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Copyright (c) 2006-2012 sqlmap developers (http://www.sqlmap.org/)
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See the file 'doc/COPYING' for copying permission
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"""
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import os
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import re
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import socket
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import threading
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import time
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class DNSQuery:
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"""
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Used for making fake DNS resolution responses based on received
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raw request
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Reference(s):
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http://code.activestate.com/recipes/491264-mini-fake-dns-server/
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https://code.google.com/p/marlon-tools/source/browse/tools/dnsproxy/dnsproxy.py
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"""
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def __init__(self, raw):
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self._raw = raw
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self._query = ""
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type_ = (ord(raw[2]) >> 3) & 15 # Opcode bits
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if type_ == 0: # Standard query
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i = 12
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j = ord(raw[i])
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while j != 0:
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self._query += raw[i+1:i+j+1] + '.'
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i = i + j + 1
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j = ord(raw[i])
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def response(self, resolution):
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"""
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Crafts raw DNS resolution response packet
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"""
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retVal = ""
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if self._query:
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retVal += self._raw[:2] + "\x81\x80"
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retVal += self._raw[4:6] + self._raw[4:6] + "\x00\x00\x00\x00" # Questions and Answers Counts
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retVal += self._raw[12:] # Original Domain Name Question
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retVal += "\xc0\x0c" # Pointer to domain name
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retVal += "\x00\x01\x00\x01\x00\x00\x00\x3c\x00\x04" # Response type, ttl and resource data length -> 4 bytes
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retVal += "".join(chr(int(_)) for _ in resolution.split('.')) # 4 bytes of IP
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return retVal
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class DNSServer:
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def __init__(self):
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self._requests = []
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self._lock = threading.Lock()
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self._socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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self._socket.bind(("", 53))
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self._running = False
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def pop(self, prefix=None, suffix=None):
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"""
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Returns received DNS resolution request (if any) that has given
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prefix/suffix combination (e.g. prefix.<query result>.suffix.domain)
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"""
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retVal = None
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with self._lock:
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for _ in self._requests:
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if prefix is None and suffix is None or re.search("%s\..+\.%s" % (prefix, suffix), _, re.I):
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retVal = _
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self._requests.remove(_)
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break
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return retVal
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def run(self):
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"""
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Runs a DNSServer instance as a daemon thread (killed by program exit)
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"""
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def _():
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try:
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self._running = True
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while True:
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data, addr = self._socket.recvfrom(1024)
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_ = DNSQuery(data)
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self._socket.sendto(_.response("127.0.0.1"), addr)
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with self._lock:
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self._requests.append(_._query)
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except KeyboardInterrupt:
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raise
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finally:
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self._running = False
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thread = threading.Thread(target=_)
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thread.daemon = True
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thread.start()
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if __name__ == "__main__":
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server = None
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try:
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server = DNSServer()
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server.run()
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while server._running:
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while True:
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_ = server.pop()
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if _ is None:
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break
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else:
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print "[i] %s" % _
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time.sleep(1)
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except socket.error, ex:
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if 'Permission' in str(ex):
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print "[x] Please run with sudo/Administrator privileges"
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else:
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raise
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except KeyboardInterrupt:
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os._exit(0)
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finally:
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if server:
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server._running = False
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