Differenze tra le versioni 2 e 3
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Dimensione: 1849
Commento:
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Dimensione: 1851
Commento:
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| Le cancellazioni sono segnalate in questo modo. | Le aggiunte sono segnalate in questo modo. |
| Linea 48: | Linea 48: |
| dummyDNS=FakeDNSServer(('',53),DNSRequestHandler) | dummyDNS=FakeDNSServer(('',PORT),DNSRequestHandler) |
1 # Fake dns threadizzato
2
3 from SocketServer import *
4
5 FAKEADDRESS="111.111.111.111"
6 PORT=53 #udp
7
8 class DNSQuery:
9 #da http://preachermm.blogspot.com/2006/04/servidor-fake-dns-en-python.html
10 def __init__(self, data):
11 self.data=data
12 self.dominio=''
13 tipo = (ord(data[2]) >> 3) & 15 # Opcode bits
14 if tipo == 0: # Standard query
15 ini=12
16 lon=ord(data[ini])
17 while lon != 0:
18 self.dominio+=data[ini+1:ini+lon+1]+'.'
19 ini+=lon+1
20 lon=ord(data[ini])
21
22 def respuesta(self, ip):
23 packet=''
24 if self.dominio:
25 packet+=self.data[:2] + "\x81\x80"
26 packet+=self.data[4:6] + self.data[4:6] + '\x00\x00\x00\x00' # Questions and Answers Counts
27 packet+=self.data[12:] # Original Domain Name Question
28 packet+='\xc0\x0c' # Pointer to domain name
29 packet+='\x00\x01\x00\x01\x00\x00\x00\x3c\x00\x04' # Response type, ttl and resource data length -> 4 bytes
30 packet+=str.join('',map(lambda x: chr(int(x)), ip.split('.'))) # 4bytes of IP
31 return packet
32 #DNSQuery
33
34 class DNSRequestHandler (DatagramRequestHandler):
35 def handle(self):
36 DNSRequest=self.rfile.read()
37 q=DNSQuery(DNSRequest)
38 DNSDatagram=q.respuesta(FAKEADDRESS)
39 self.wfile.write(DNSDatagram)
40 #DNSRequestHandler
41
42 #crea una classe di server udp threadizzato
43 class FakeDNSServer (ThreadingMixIn, UDPServer): pass
44
45 dummyDNS=FakeDNSServer(('',PORT),DNSRequestHandler)
46
47 #per prevenire attacchi, l'unico modo x fermare il server e' killarlo (SIGTERM, SIGKILL) o premere ctrl-C
48 going=True
49 while going:
50 try:
51 dummyDNS.serve_forever()
52 except KeyboardInterrupt:
53 going=False
54 except:
55 pass