Don't Worry Government, I Got This Porn Filter Sorted - SickSad

So i hear the UK government wants to make a porn filter. About bloody time i reckon. I’m fed up of happily browsing the Internet for boobs, only to have non-porn related subject matter thrust down my face hole.

So taking inspiration from other great Internet filtering nations such as North Korea, China, Syria, Iran, Cuba, Bahrain, Belarus, Burma, Uzbekistan, Saudia Arabia and Vietnam I decided to help out the UK government and build an Internet filter that only allows pornographic material through.

You’re Welcome.

All code is available here https://github.com/SickSad/UKPR0nFilter

Just follow this simple step-by-step video walk-through and you’ll have a porn filter running in no time!

The filter is a dns server which checks all queries against the OpenDNS FamilySheild DNS server. Any request that is denied by OpenDNS is then allowed by our DNS server, and any request allowed by OpenDNS is blocked by us.

The server itself it built using the python Twisted framework which handles both the DNS requests and acts as a simple web-server to host the denial page.

pns.py1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 #!/usr/bin/env python # # pns.py is a simple DNS server which only allows pornographic material through. # # Bits and pieces robbed from here: # https://gist.github.com/johnboxall/1147973 # http://twistedmatrix.com/trac/wiki/TwistedWeb import socket import dns.resolver as DNS from twisted.internet.protocol import Factory, Protocol from twisted.internet import reactor from twisted.names import dns from twisted.names import client, server from twisted.web import server as webserver from twisted.web import resource import sys index = open('index.html').read() class Simple(resource.Resource): isLeaf = True def render_GET(self, request): return index class DNSServerFactory(server.DNSServerFactory): def gotResolverResponse(self, (ans, auth, add), protocol, message, address): qname = message.queries[0].name.name print qname blocked_resolver = DNS.Resolver() blocked_resolver.nameservers = ['208.67.222.123','208.67.220.123'] porn = False results = blocked_resolver.query(qname) for r in results: print r if str(r).startswith('67.215.65'): print "PRON" porn = True if porn == False: print "NOT PRON" for answer in ans: if answer.type != dns.A: continue answer.payload.address = socket.inet_aton(ip_address) answer.payload.ttl = 60 #address = ('127.0.0.1', 43160) args = (self, (ans, auth, add), protocol, message, address) result=server.DNSServerFactory.gotResolverResponse(*args) print result return result verbosity = 0 ip_address = "" if len(sys.argv) > 1: ip_address = sys.argv[1] else: ip_address = '127.0.0.1' resolver = client.Resolver(servers=[('8.8.8.8', 53)]) factory = DNSServerFactory(clients=[resolver], verbose=verbosity) protocol = dns.DNSDatagramProtocol(factory) factory.noisy = protocol.noisy = verbosity reactor.listenUDP(53, protocol) reactor.listenTCP(53, factory) site = webserver.Site(Simple()) reactor.listenTCP(8080, site) reactor.run()