We turn over the Internet on April 1st

In order to arrange a complete revolution of the Internet we need

1) Server distributing Internet for local network
2) Proxy server
3) 15 minutes time
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The scheme is very simple. The proxy will work in transparent mode and transfer all links to images to the script, which can download and modify these images.



Squid configuration:

  acl localnet src 192.168.0.0/24
 http_access allow localnet
 http_port 3128 transparent
 url_rewrite_program /usr/local/bin/flip.pl 

Pictures will fall in / var / www / images
You need to properly configure the rights. Since in ubuntu squid will work from under the proxy user

Script to convert images. Save as /usr/local/bin/flip.pl

 #! / usr / bin / perl
 $ | = 1;
 $ count = 0;
 $ pid = $$;
 while (<>) {
         chomp $ _;
         if ($ _ = ~ /(.*\.jpg)/i) {
                 $ url = $ 1;
                 system ("/ usr / bin / wget", "-q", "-O", "/ var / www / images / $ pid- $ count.jpg", "$ url");
                 system ("/ usr / bin / mogrify", "-flip", "/ var / www / images / $ pid- $ count.jpg");
                 print "http://127.0.0.1/images/$pid-$count.jpg\n";
         }
         elsif ($ _ = ~ /(.*\.gif)/i) {
                 $ url = $ 1;
                 system ("/ usr / bin / wget", "-q", "-O", "/ var / www / images / $ pid- $ count.gif", "$ url");
                 system ("/ usr / bin / mogrify", "-flip", "/ var / www / images / $ pid- $ count.gif");
                 print "http://127.0.0.1/images/$pid-$count.gif\n";

         }
         elsif ($ _ = ~ /(.*\.png)/i) {
                 $ url = $ 1;
                 system ("/ usr / bin / wget", "-q", "-O", "/ var / www / images / $ pid- $ count.png", "$ url");
                 system ("/ usr / bin / mogrify", "-flip", "/ var / www / images / $ pid- $ count.png");
                 print "http://127.0.0.1/images/$pid-$count.png\n";

         }
         else {
                 print "$ _ \ n" ;;
         }
         $ count ++;
 }

After that we include a redirect to iptables:

  sudo iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 3128