forked from henices/Tcp-DNS-proxy
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tcpdns.py
executable file
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tcpdns.py
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#! /usr/bin/python
# -*- coding: utf-8 -*-
# cody by zhouzhenster@gmail.com
# ver: 0.2 update 2011-10-23
# use SocketServer to run a multithread udp server
# update:
# 2012-04-16, add more public dns servers support tcp dns query
# 2013-05-14 merge code from linkerlin, add gevent support
# 8.8.8.8 google
# 8.8.4.4 google
# 156.154.70.1 Dnsadvantage
# 156.154.71.1 Dnsadvantage
# 208.67.222.222 OpenDNS
# 208.67.220.220 OpenDNS
# 198.153.192.1 Norton
# 198.153.194.1 Norton
import os, sys
import socket
import struct
import threading
import SocketServer
import traceback
import random
import optparse
try:
import gevent
from gevent import monkey
except:
print "Install gevent will save a lot of CPU time"
else:
monkey.patch_all()
from caches import *
DHOSTS = ['156.154.70.1', # remote dns server address list
#'8.8.8.8',
'8.8.4.4',
#'156.154.71.1',
'208.67.222.222',
#'208.67.220.220',
#'198.153.192.1',
#'198.153.194.1',
#'74.207.247.4',
#'209.244.0.3',
#'8.26.56.26'
]
DPORT = 53 # default dns port 53
TIMEOUT = 1 # set timeout 5 second
VERBOSE = 0
from servers import Servers
from dnsserver import DNSServer
ss=Servers()
for host in DHOSTS:
ss.addDNSServer(DNSServer(host))
#-------------------------------------------------------------
# Hexdump Cool :)
# default width 16
#--------------------------------------------------------------
def hexdump( src, width=16 ):
FILTER=''.join([(len(repr(chr(x)))==3) and chr(x) or '.' for x in range(256)])
result=[]
for i in xrange(0, len(src), width):
s = src[i:i+width]
hexa = ' '.join(["%02X"%ord(x) for x in s])
printable = s.translate(FILTER)
result.append("%04X %s %s\n" % (i, hexa, printable))
return ''.join(result)
#---------------------------------------------------------------
# bytetodomain
# 03www06google02cn00 => www.google.cn
#--------------------------------------------------------------
def bytetodomain(s):
domain = ''
i = 0
length = struct.unpack('!B', s[0:1])[0]
while length != 0 :
i += 1
domain += s[i:i+length]
i += length
length = struct.unpack('!B', s[i:i+1])[0]
if length != 0 :
domain += '.'
return domain
#--------------------------------------------------
# tcp dns request
#---------------------------------------------------
def QueryDNS(server, port, querydata, method = "tcp"):
# length
Buflen = struct.pack('!h', len(querydata))
sendbuf = Buflen + querydata
data=None
s=None
try:
if method == "tcp":
print "tcp"
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(TIMEOUT) # set socket timeout
s.connect((server, int(port)))
s.send(sendbuf)
data = s.recv(2048)
elif method == "udp":
print "udp"
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.settimeout(TIMEOUT) # set socket timeout
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
#print type(querydata),(server, int(port))
s.sendto(querydata, (server, int(port)))
r,serv=s.recvfrom(1024)
#r,serv=s.recvfrom(1024)
data = struct.pack('!h', len(r))+r
except Exception, e:
import traceback as tb
print '[ERROR] QueryDNS: %s' % e.message
tb.print_stack()
finally:
if s: s.close()
return data
#----------------------------------------------------
# show dns packet information
#----------------------------------------------------
def show_info(data, direction):
try:
from dns import message as m
except ImportError:
print "Install dnspython module will give you more response infomation."
else:
if direction == 0:
print "query:\n\t", "\n\t".join(str(m.from_wire(data)).split("\n"))
print "\n================"
elif direction == 1:
print "response:\n\t","\n\t".join(str(m.from_wire(data)).split("\n"))
print "\n================"
#-----------------------------------------------------
# send udp dns respones back to client program
#----------------------------------------------------
def transfer(querydata, addr, server):
if not querydata: return
domain = bytetodomain(querydata[12:-4])
qtype = struct.unpack('!h', querydata[-4:-2])[0]
print 'domain:%s, qtype:%x, thread:%d' % \
(domain, qtype, threading.activeCount())
sys.stdout.flush()
response=None
for i in range(9):
choose = random.sample(xrange(len(DHOSTS)), 1)[0]
DHOST = DHOSTS[choose]
#response = QueryDNS(DHOST, DPORT, querydata)
response = ss.query(querydata)
if response:
# udp dns packet no length
server.sendto(response[2:], addr)
if int(VERBOSE) > 0:
show_info(querydata, 0)
show_info(response[2:], 1)
break
if response is None:
print "[ERROR] Tried 9 times and failed to resolve %s" % domain
return
class ThreadedUDPServer(SocketServer.ThreadingMixIn, SocketServer.UDPServer):
SocketServer.ThreadingMixIn.daemon_threads = True
def __init__(self, s, t):
SocketServer.UDPServer.__init__(self, s, t)
class ThreadedUDPRequestHandler(SocketServer.BaseRequestHandler):
# Ctrl-C will cleanly kill all spawned threads
daemon_threads = True
# much faster rebinding
allow_reuse_address = True
def handle(self):
data = self.request[0]
socket = self.request[1]
addr = self.client_address
transfer(data, addr, socket)
#------------------------------------------------------
# main entry
#------------------------------------------------------
if __name__ == "__main__":
print '>> Please wait program init....'
print '>> Init finished!'
print '>> Now you can set dns server to 127.0.0.1'
parser = optparse.OptionParser()
parser.add_option("-v", dest="verbose", default="0", help="Verbosity level, 0-2, default is 0")
options, _ = parser.parse_args()
VERBOSE = options.verbose
server = ThreadedUDPServer(('0.0.0.0', 53), ThreadedUDPRequestHandler)
# on my ubuntu uid is 1000, change it
# comment out below line on windows platform
#os.setuid(1000)
server.serve_forever()
server.shutdown()