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tcpdns.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# cody by [email protected]
#
# Change log:
#
# 2011-10-23 use SocketServer to run a multithread udp server
# 2012-04-16 add more public dns servers support tcp dns query
# 2013-05-14 merge code from @linkerlin, add gevent support
# 2013-06-24 add lru cache support
# 2013-08-14 add option to disable cache
# 2014-01-04 add option "servers", "timeout" @jinxingxing
# 2014-04-04 support daemon process on unix like platform
# 2014-05-27 support udp dns server on non-standard port
# 2014-07-08 use json config file
# 2014-07-09 support private host
# 2015-01-14 support dns server auto switch
# 2018-09-01 add DNS compression pointer mutation and pseudo-package filter to Anti DNS Poisoning & hijack(ISP Level)
# 2022-06-06 support Python 3.x
# 8.8.8.8 google
# 8.8.4.4 google
# 208.67.222.222 OpenDNS
# 208.67.220.220 OpenDNS
import gevent
from pylru import lrucache
import os,sys,random,time,json,argparse,logging,struct,socket,ctypes
from fnmatch import fnmatch
# import third_party
if sys.version_info.major < 3: import SocketServer; py2 = 1
else: import socketserver as SocketServer; py2 = 0
cfg = {}
LRUCACHE = []
DNS_SERVERS = None
FAST_SERVERS = None
SPEED = {}
DATA = {'err_counter': 0, 'speed_test': False}
UDPMODE = False
PIDFILE = '/tmp/tcpdns.pid'
def cfg_logging(dbg_level):
""" logging format
"""
logging.basicConfig(format='[%(asctime)s][%(levelname)s] %(message)s', level=dbg_level)
def hexdump(src, width=16):
""" hexdump, default width 16
"""
FILTER = ''.join(
[(x < 0x7f and x > 0x1f) 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)
def bytetodomain(s):
"""bytetodomain
03www06google02cn00 => www.google.cn
"""
qnl = []
domain = ''
i = 0
length = struct.unpack('!B', s[0:1])[0]
while length != 0:
i += 1
qnl.append(s[i-1:i + length])
domain += s[i:i + length].decode()
i += length
length = struct.unpack('!B', s[i:i + 1])[0]
if length != 0: # 可取消判断，带根域“.”
domain += '.'
return (domain, qnl)
def dnsping(ip, port):
buff = b"\x00\x16\xb2\xc3\x01\x00\x00\x01"
buff += b"\x00\x00\x00\x00\x00\x00\x01\x67" # '\x67' == 'g'
buff += b"\x02\x63\x6e\x00\x00\x01\x00\x01" # '\x63\x6e' == 'cn'
cost = 100
begin = time.time()
try:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(cfg['socket_timeout'])
s.connect((ip, int(port)))
s.send(buff)
s.recv(512)
except Exception as e:
logging.error('%s:%s, %s' % (ip, port, str(e)))
else:
cost = time.time() - begin
key = '%s:%d' % (ip, int(port))
if key not in SPEED:
SPEED[key] = []
SPEED[key].append(cost)
def TestSpeed():
global DNS_SERVERS, FAST_SERVERS, DATA
DATA['speed_test'] = True
if cfg['udp_mode']:
servers = cfg['udp_dns_server']
else:
servers = cfg['tcp_dns_server']
logging.info('Testing dns server speed ...')
jobs = []
for i in xrange(0, 6):
for s in servers:
ip, port = s.split(':')
jobs.append(gevent.spawn(dnsping, ip, port))
gevent.joinall(jobs)
cost = {}
for k, v in SPEED.items():
cost[k] = sum(v)
d = sorted(cost, key=cost.get)
FAST_SERVERS = d[:3]
DNS_SERVERS = FAST_SERVERS
DATA['err_counter'] = 0
DATA['speed_test'] = False
def private_dns_response(data):
ret = None
TID = data[0:2]
Questions = data[4:6]
AnswerRRs = data[6:8]
AuthorityRRs = data[8:10]
AdditionalRRs = data[10:12]
q_name, qnl = bytetodomain(data[12:])
lqn = len(q_name)
# q_type = struct.unpack('!h', data[-4:-2])[0] # q_type 处理有问题 未考虑查询包含Additional的附加内容，还有其它几处也是如此
q_type = struct.unpack('!H', data[14+lqn:16+lqn])[0]
logging.debug('domain:%s, qtype:%x' % (q_name, q_type))
try:
if q_type != 0x0001:
return
if Questions != b'\x00\x01' or AnswerRRs != b'\x00\x00' or AuthorityRRs != b'\x00\x00': # or AdditionalRRs != '\x00\x00'
return
items = cfg['private_host'].items()
for domain, ip in items:
if fnmatch(q_name, domain):
ret = TID
ret += b'\x81\x80'
ret += b'\x00\x01'
ret += b'\x00\x01'
ret += b'\x00\x00'
ret += b'\x00\x00'
ret += data[12:]
ret += b'\xc0\x0c'
ret += b'\x00\x01'
ret += b'\x00\x01'
ret += b'\x00\x00\xff\xff'
ret += b'\x00\x04'
ret += socket.inet_aton(ip)
finally:
return (q_type, q_name, ret)
def QueryDNS(server, port, qdata): # 处理传入的UDP包，转发给上游DNS
"""tcp dns request
Args:
server: remote tcp dns server
port: remote tcp dns port
qdata - querydata: udp dns request packet data
Returns:
tcp dns response data
"""
global DATA, DNS_SERVERS
if DATA['err_counter'] > 10 and not DATA['speed_test']:
TestSpeed()
q_name, qnl = bytetodomain(qdata[12:])
lqn = len(q_name)
qll = len(qnl)
AdditionalRRs = qdata[10:12]
rf = len_AddRRs = 0
rand_s = 0
rand_e = 5
if '8.8.4.4:53' in DNS_SERVERS: rand_e = 3 # 0-3 query
else: rand_s = 4 # 4-5 query
# add DNS compression pointer mutation
if qll > 1:# and UDPMODE: # not root or gTLD and only UDP mode
if AdditionalRRs != b'\x00\x00': AddRRs = qdata[18+lqn:] # 判断是否含有附加部分，并提取
else:
AddRRs = b'\x00\x00\x29\x10\x00\x00\x00\x00\x00\x00\x00' # 否则自定义附加部分 0000291000000000000000 len=11(0x0b)
AdditionalRRs = b'\x00\x01'
len_AddRRs = len(AddRRs) # 计算附加部分的长度 # len(qdata) - lqn - 18
cpl = [b'\xC0\x04', b'\xC0\x06', b'\xC0\x07', b'\xC0\x08', b'\xC0\x09', b'\xC0\x0a'] # 结束指针 列表
rf = random.randint(rand_s,rand_e) # rf=0|1时 排序重组 随机2-n查询 2|3时 分别使用2|3查询 4|5 1查询 并过滤伪包 可用其他国外DNS 目前已知仅8888和8844支持多查询
if rf < 2 or qll > 4: # qnl 重组 2-n查询
qi = random.randint(2,qll)
qdi = b'\x00' + struct.pack('!B', qi) # 查询数 随机2-n查询
lp = [b''] * (qll) # qnl[i+1] 的 偏移指针 lp[i] 即指向 qnl[i+1] 的偏移量
lp[qll-1] = random.choice(cpl) # qnl[qll-1] 后的 结束指针
li = list(range(1,qll)) # range(qll)[1:] [1, 2, 3, ..., qll-1]
if rf: random.shuffle(li) # 随机排序 否则 逆序
else: li.reverse() # li = [qll-1, ..., 3, 2, 1]
qdn = [qnl[0], b'\xC0\x30', qdata[lqn + 14: lqn + 18]] # 查询数据部分 第一个查询 qnl[1]的指针(占位) 查询类型
idx = 0x12+len(qnl[0]) # 当前相对偏移 12+2+4=18(0x12)
# 方法1，使用列表索引
for n,i in enumerate(li): # li=[3, 2, 1]
qdn.append(qnl[i])
lp[i-1] = b'\xC0' + struct.pack('!B', idx) # 偏移量
qdn.append(b'\xC0\x3d') # qdn.append('\xC0' + struct.pack('!B',0x31 + i)) 指针占位符 '\xC0\x3d'
qdn.append(struct.pack('!I',random.randint(0,0xFFFFFFFF))) # b'\x00\x01\x00\x01' # 附加随机 QTYPE+QCLASS
idx += len(qnl[i]) + 6
if n+2 == qi: idx += len_AddRRs
for n,i in enumerate([0]+li): qdn[n*3+1] = lp[i] # 写入指针偏移
qdn.insert(qi*3, AddRRs) # 插入 附加数据
''' 方法2，无列表索引，后面使用 qdn.index 查找索引，逻辑较简单
for v in li: # li = [2, 1, 0]
qdn.append(qnl[v])
lp[v] = '\xC0' + struct.pack('!B', idx)
# idx += len(qnl[v])
if v == qll - 1: qdn.append(random.choice(cpl)) # 判断 并且附加结束指针
else: qdn.append('\xC0' + struct.pack('!B',0x31 + v))
if rf: idx += len(qnl[v]) + 2
else:
qdn.append('\x00' + '\x01' + '\x00' + '\x01')
idx += len(qnl[v]) + 6
for i,v in enumerate(lp): qdn[qdn.index('\xC0' + struct.pack('!B',0x30 + i))] = v
qdn.append(AddRRs) # 添加 附加数据
'''
elif rf > 3: # rf=4|5 1查询
qdi = b'\x00\x01'
if rf > 4: qdn = [qdata[12:lqn+13], random.choice(cpl), qdata[lqn+14:lqn+18], AddRRs] # 仅修改结束指针，返回2个伪包
else: # rn后移 随机排序
cpl += [b'\xC0\x0e', b'\xC0\x10']
lp = [b''] * (qll + 1) # rn的指针数据
lp[qll] = random.choice(cpl)
li = list(range(qll))
random.shuffle(li) # li=[0, 3, 2, 1]
qdn = [b'\xC0\x30', qdata[lqn + 14: lqn + 18], AddRRs] # 第一个查询的指针 查询类型 附加数据
idx = 0x12 + len_AddRRs
for i in li: # i=0,3,2,1
qdn.append(qnl[i])
lp[i] = b'\xC0' + struct.pack('!B', idx)
qdn.append(b'\xC0\x3d') # qdn.append('\xC0' + struct.pack('!B',0x31 + v)) 指针占位符 '\xC0\x3d'
idx += len(qnl[i]) + 2
for n,i in enumerate(li): qdn[n*2+4] = lp[i+1] # 写入指针偏移
qdn[0] = lp[0]
else: # rf=2|3 r2后移 随机使用2|3个查询
qdi = b'\x00' + struct.pack('!B', rf) # 2|3查询
r1 = qnl[-1] # 顶级域名gTLD
r2 = qnl[-2] # 一级域名
cp_r2 = 0 # r2的偏移指针
cp_r1 = lqn-len(r2)-len(r1)+19 # 计算 r1的偏移指针 len(rn)-len(r2)-len(r1)+6+12
qdn = qnl[:-2] # 提取 r2 前的子域名数据
qdn.append(b'\xC0\x00') # 添加占位字符串 r2的偏移指针
qdn.append(qdata[14+lqn:18+lqn]) # 添加QTYPE和QCLASS
qdn.append(r1)
cpl += [b'\x00', b'\x00', b'\x00', b'\x00']
cpe = random.choice(cpl)
qdn.append(cpe) # 添加 结束指针
qdn.append(struct.pack('!I',random.randint(0,0xFFFFFFFF))) # 尾部 QTYPE:A QCLASS:IN 固定值 00010001 不影响查询
if rf == 2: # 2查询
qdn.append(AddRRs) # 先添加 附加数据
cp_r2 += len(AddRRs)
qdn.append(r2) # 添加 r2
qdn.append(struct.pack('!2B',0xc0,cp_r1)) # 添加 r1的偏移指针
qdn.append(struct.pack('!I',random.randint(0,0xFFFFFFFF))) # 多添加一个 QTYPE:A QCLASS:IN 和 附加数据
qdn.append(AddRRs)
''' # 原始逻辑 2查询后面不会多出 QTYPE:A QCLASS:IN 和 附加数据
if rf == 2: # 2查询
qdn.append(AddRRs) # 添加 附加数据
cp_r2 += len(AddRRs)
qdi = '\x00\x02' # 查询数写为2
qdn.append(r2) # 添加 r2
qdn.append(struct.pack('!2B',0xc0,cp_r1)) # 添加 r1的偏移指针
else: # 3查询
qdn.append(r2) # 添加 r2 (后移为第3个查询)
qdn.append(struct.pack('!2B',0xc0,cp_r1)) # 添加 r1的偏移指针
qdn.append('\x00\x01\x00\x01') # 多添加一个 QTYPE:A QCLASS:IN
qdn.append(AddRRs) # 附加数据
'''
cp_r2 += lqn-len(r2)+len(cpe)+23 # 计算 r2的偏移指针 len(rn)-len(r2)+5|6+6+12; 其中 len(rn)=lqn+1 (尾部 结束指针|00 00010001 共5|6字节；指针偏移+QTYPE+QCLASS共6字节；头部12字节)
qdn[len(qnl[:-2])] = struct.pack('!2B',0xc0,cp_r2) # 写入 r2的偏移指针
# 结果：
# qdn = [03777777, C02a, 00010001, 03636f6d, 00 00010001, 0000291000000000000000, 06676f6f676c65, C016, 00010001, 0000291000000000000000]
# qdn = [03777777, C01f, 00010001, 03636f6d, 00 00010001, 06676f6f676c65, C016, 00010001, 0000291000000000000000]
logging.debug('Query rand: %d\tQuery Count: %d' % (rf,ord(qdi[1:])))
logging.debug('qdn= %s' % qdn)
qdl = [qdata[0:4], qdi, qdata[6:10], AdditionalRRs] + qdn # 添加头部 合成数据
#print('%r\n----------------------------------------'%qdl)
qdata = b''.join(qdl) # 修改数据包，生成新的 qdata
# length
Buflen = struct.pack('!H', len(qdata))
sendbuf = UDPMODE and qdata or Buflen + qdata
data = None
protocol = UDPMODE and socket.SOCK_DGRAM or socket.SOCK_STREAM
s = socket.socket(socket.AF_INET, protocol)
# set socket timeout fix TCP-timeout
s_tmo = UDPMODE and cfg['socket_timeout'] or cfg['socket_timeout'] + 3
s.settimeout(s_tmo)
logging.debug('Send Questions: %s'%' '.join('%02X'%(ord(x) if py2 else x) for x in sendbuf)) # repr(qdata).replace('\\x', '')[1:-1]
try:
s.connect((server, int(port)))
s.send(sendbuf)
# pseudo-package filter
i = 0
while i < 3:
data = s.recv(2048)
logging.debug('Recv Data: %s'%''.join('%02X'%(ord(x) if py2 else x) for x in data))
if rf < 4: break # 不过滤多查询 部分ISP 8.8.8.8 返回错误
if not UDPMODE: break # 不过滤TCP查询 UDP53有污染 TCP53被RST
if AdditionalRRs == b'\x00\x00': break # 请求包中没有 附加数据
recv_AddRRs = UDPMODE and data[10:12] or data[12:14] # 响应包中附加RR的数量
if recv_AddRRs == AdditionalRRs: break
else:
# data = None
i += 1
continue
logging.debug('Remote Answers: %s'%' '.join('%02X'%(ord(x) if py2 else x) for x in data))
except Exception as e:
DATA['err_counter'] += 1
logging.error('Server %s:%s %s' % (server,port, str(e)))
else:
return data
finally:
if s: s.close()
'''
def check_dns_packet(data, q_type): # 响应包检查 不使用
global UDPMODE
test_ipv4 = False
test_ipv6 = False
if len(data) < 12:
return False
Flags = UDPMODE and data[2:4] or data[4:6]
AddRRs = UDPMODE and data[10:12] or data[12:14] # 检查并移除附加部分，使用请求包中附加部分的长度，可能会有问题？
if AddRRs != '\x00\x00':
if len_AddRRs != 0: data = data[:-len_AddRRs]
Reply_code = struct.unpack('!H', Flags)[0] & 0x000F
# TODO: need more check
if Reply_code == 3: # RCODE（Response code）由服务端在响应中设置的 4 位响应代码
return True
0 – 没有错误。
1 – 格式错误。服务器无法解释请求。
2 – 服务器失败。因为服务器的某些故障而不能完成解析请求。
3 – 名字错误。这个错误代码只会出现在授权的域名服务器的响应中，含义为请求查询的域名不存在。
4 – 未实现。当前服务器不支持这种查询。
5 – 拒绝。服务器主动拒绝当前的查询请求。
6 ~ 15 – 为其他失败保留的代码。
if q_type == 0x0001: # A 记录
# 处理有问题，未考虑附加部分的记录，暂时使用移除附加部分来解决
ipv4_len = data[-6:-4]
ipv4_answer_class = data[-12:-10]
ipv4_answer_type = data[-14:-12]
test_ipv4 = (ipv4_len == '\x00\x04' and \
ipv4_answer_class == '\x00\x01' and \
ipv4_answer_type == '\x00\x01')
if not test_ipv4:
ipv6_len = data[-18:-16]
ipv6_answer_class = data[-24:-22]
ipv6_answer_type =data[-26:-24]
test_ipv6 = (ipv6_len == '\x00\x10' and \
ipv6_answer_class == '\x00\x01' and \
ipv6_answer_type == '\x00\x1c')
if not (test_ipv4 or test_ipv6):
return False
return Reply_code == 0
'''
def transfer(querydata, addr, server):
"""send udp dns respones back to client program
Args:
querydata: udp dns request data
addr: udp dns client address
server: udp dns server socket
Returns:
None
"""
global UDPMODE
if len(querydata) < 12: return
response = None
t_id = querydata[:2]
key = ''.join(['%02x'%(ord(x) if py2 else x) for x in querydata[2:]]) # querydata[2:].encode('hex')
q_type, q_name, response = private_dns_response(querydata)
if response:
server.sendto(response, addr)
return
UDPMODE = cfg['udp_mode']
if FAST_SERVERS:
DNS_SERVERS = FAST_SERVERS
else:
DNS_SERVERS = UDPMODE and cfg['udp_dns_server'] or cfg['tcp_dns_server']
if cfg['internal_dns_server'] and cfg['internal_domain']:
for item in cfg['internal_domain']:
if fnmatch(q_name, item):
UDPMODE = True
DNS_SERVERS = cfg['internal_dns_server']
# logging.debug('Key Hit Cache:%r\n'%(key in LRUCACHE))
if cfg['enable_lru_cache'] and key in LRUCACHE: # Hit cache
response = LRUCACHE[key]
# sendbuf = UDPMODE and response[2:] or response[4:]
server.sendto(t_id + response[2:], addr)
return
if cfg['enable_server_switch']: random.shuffle(DNS_SERVERS) # switch DNS_SERVERS sls=DNS_SERVERS[:] copy
for item in DNS_SERVERS:
ip, port = item.split(':')
logging.debug("server: %s port:%s" % (ip, port))
response = QueryDNS(ip, port, querydata)
if response is None: # or not check_dns_packet(response, q_type): 不检查DNS响应包
continue
sendbuf = UDPMODE and response or response[2:]
if cfg['enable_lru_cache'] and len(sendbuf) > 12: LRUCACHE[key] = sendbuf
server.sendto(sendbuf, addr)
break
if response is None:
logging.error('******** Tried many times failed to resolve %s' % q_name)
class ThreadedUDPServer(SocketServer.ThreadingMixIn, SocketServer.UDPServer):
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) # 只允许传入的UDP查询
logging.debug('------------------------------------- End transfer')
'''
import daemon as Daemon
class RunDaemon(Daemon):
def run(self):
thread_main(cfg)
def StopDaemon():
RunDaemon(PIDFILE).stop()
'''
def HideCMD():
whnd = ctypes.windll.kernel32.GetConsoleWindow()
if whnd != 0:
ctypes.windll.user32.ShowWindow(whnd, 0)
ctypes.windll.kernel32.CloseHandle(whnd)
def thread_main(cfg):
server = ThreadedUDPServer((cfg["host"], cfg["port"]), ThreadedUDPRequestHandler)
try:
server.serve_forever()
except KeyboardInterrupt:
print("Ctrl+C pressed... Exit(0)")
sys.exit(0)
finally:
server.shutdown()
if __name__ == "__main__":
parser = argparse.ArgumentParser(description='A DNS Proxy')
parser.add_argument('-f', dest='config_json', type=argparse.FileType('r'),
required=False, default='tcpdns.json', help='Json config file')
parser.add_argument('-d', dest='dbg_level', action='store_true',
required=False, default=False, help='Print debug message')
parser.add_argument('-s', dest="stop_daemon", action='store_true',
required=False, default=False, help='Stop dns proxy daemon')
args = parser.parse_args()
if args.stop_daemon:
# StopDaemon()
sys.exit(0)
if args.dbg_level:
cfg_logging(logging.DEBUG)
else:
cfg_logging(logging.INFO)
try:
cfg = json.load(args.config_json)
except:
logging.error('Loading json config file error [!!]')
sys.exit(1)
if "host" not in cfg.keys(): # 注意大小写
cfg["host"] = "0.0.0.0"
if "port" not in cfg.keys():
cfg["port"] = 53
if cfg['udp_mode']:
DNS_SERVERS = cfg['udp_dns_server']
else:
DNS_SERVERS = cfg['tcp_dns_server']
if cfg['enable_lru_cache']:
LRUCACHE = lrucache(cfg['lru_cache_size'])
logging.info('A DNS Proxy, Thanks https://github.com/henices/Tcp-DNS-proxy' )
logging.info('DNS Servers: %s' % DNS_SERVERS)
logging.info('Upstream Mode: %s' % ('UDP' if cfg['udp_mode'] else 'TCP'))
logging.info('Enable Cache: %r' % (cfg['enable_lru_cache']))
logging.info('Enable Switch: %r' % (cfg['enable_server_switch']))
logging.info('Query Timeout: %f' % (cfg['socket_timeout']))
if cfg['speed_test']: TestSpeed()
logging.info('Now you can set dns server to %s:%s' % (cfg["host"], cfg["port"]))
if cfg['daemon_process']:
if os.name == 'nt':
HideCMD()
thread_main(cfg)
else:
# d = RunDaemon(PIDFILE)
# d.start()
try:
import daemon
logging.info('Run code in daemon process')
with daemon.DaemonContext(detach_process=True): thread_main(cfg)
except ImportError:
logging.error('Please install python-daemon')
else:
thread_main(cfg)