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httpdns.py
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httpdns.py
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#!/usr/bin/env python3
# encoding: utf-8
#dnspod httpdns proxy
#Only supported TYPE A Class IN Standard query
import urllib.request, socket
class httpdns(object):
def __init__(self, ednsip, ttl=300):
self.domain=''
self.ednsip=ednsip
self.ANCOUNT=0
self.TTL=(ttl).to_bytes(4, byteorder='big')
self.answer=b''
def labelsTOdomain(self, domain):
# b'\x03www\x06google\x03com\x00' -> 'www.google.com'
i=0
r=[]
for x in domain:
if i == 0:
i=x
x=46 #ord('.') -> 46
else:
i=i-1
r.append(x)
return bytes(r)[1:-1].decode('ASCII')
def httprequest(self, Qdata):
self.domain=self.labelsTOdomain(Qdata[:-4])
try:
Rdata=urllib.request.urlopen('http://119.29.29.29/d?dn=%s&ip=%s' % (self.domain,self.ednsip)).read().split(b';')
except OSError:
print('httprequest error')
return 0, Qdata, b''
try:
Rdata=[bytes([int(y) for y in x.split(b'.')]) for x in Rdata]
except ValueError:
print('non answer')
return 0, Qdata, b''
return len(Rdata), b''.join([b'\xc0\x0c\x00\x01\x00\x01',self.TTL, b'\x00\x04']).join([Qdata, *Rdata]), Rdata
class udpdnsserver(object):
def __init__(self, addr='127.0.0.1', port=53):
self.udpfd=socket.socket(family=socket.AF_INET, type=socket.SOCK_DGRAM)
self.udpfd.bind((addr, port))
self.addr=()
self.QID=b''
self.flages=0
def input(self):
data, self.addr=self.udpfd.recvfrom(1500)
self.flages=int(data[2:4].hex(), 16)
self.QID=data[0:2]
Rcode=0
if self.flages&0x7800:
Rcode=4
elif self.flages&0x8000 != 0:
Rcode=1
elif data[4:6] == b'\x00\x01':
i=0
for x in data[12:]:
i=i+1
if x == 0:
break
if data[12+i:i+16] != b'\x00\x01\x00\x01':
Rcode=4
else:
Rcode=4
if Rcode:
qdata=data[12:]
else:
qdata=data[12:i+16]
return Rcode, qdata
def output(self, Rcode, Rdata, ANCOUNT=0):
if Rcode:
self.flages=self.flages|Rcode
#self.flages=self.flages|0x8000 #不能直接用请求的flag
self.flages=0x8080 #这样dnsmasq才会缓存结果
Rcount=b''.join([b'\x00\x01', ANCOUNT.to_bytes(2, byteorder='big'), b'\x00\x00\x00\x00'])
Rdata=b''.join([self.QID, self.flages.to_bytes(2, byteorder='big'), Rcount, Rdata])
self.udpfd.sendto(Rdata, self.addr)
if __name__ == '__main__':
localserver=udpdnsserver(addr='0.0.0.0')
dnspod=httpdns(ednsip='211.138.113.115')
while 1:
Rcode, Qdata=localserver.input()
if Rcode:
localserver.output(Rcode, Rdata=Qdata)
else:
ANCOUNT, Rdata, tmp=dnspod.httprequest(Qdata)
localserver.output(Rcode, Rdata, ANCOUNT)