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September 15, 2021 14:10
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FakeDNS (Python3)
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#!/usr/bin/python3 | |
__author__ = 'Francisco Santos' | |
# URL: https://code.activestate.com/recipes/491264-mini-fake-dns-server/ | |
import socket | |
class DNSQuery: | |
def __init__(self, data): | |
self.data=data | |
self.dominio='' | |
tipo = (ord(data[2]) >> 3) & 15 # Opcode bits | |
if tipo == 0: # Standard query | |
ini=12 | |
lon=ord(data[ini]) | |
while lon != 0: | |
self.dominio+=data[ini+1:ini+lon+1]+'.' | |
ini+=lon+1 | |
lon=ord(data[ini]) | |
def respuesta(self, ip): | |
packet='' | |
if self.dominio: | |
packet+=self.data[:2] + "\x81\x80" | |
packet+=self.data[4:6] + self.data[4:6] + '\x00\x00\x00\x00' # Questions and Answers Counts | |
packet+=self.data[12:] # Original Domain Name Question | |
packet+='\xc0\x0c' # Pointer to domain name | |
packet+='\x00\x01\x00\x01\x00\x00\x00\x3c\x00\x04' # Response type, ttl and resource data length -> 4 bytes | |
packet+=str.join('',[chr(int(x)) for x in ip.split('.')]) # 4bytes of IP | |
return packet | |
if __name__ == '__main__': | |
ip='192.168.1.1' | |
print('pyminifakeDNS:: dom.query. 60 IN A %s' % ip) | |
udps = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) | |
udps.bind(('',53)) | |
try: | |
while 1: | |
data, addr = udps.recvfrom(1024) | |
p=DNSQuery(data) | |
udps.sendto(p.respuesta(ip), addr) | |
print('Respuesta: %s -> %s' % (p.dominio, ip)) | |
except KeyboardInterrupt: | |
print('Finalizando') | |
udps.close() |
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