Internet upside down

Good afternoon, approaching April 1, and I really would not want this day to be the same as the rest, so I offer a special, IT fun. This is a translation of an article accidentally found on the Internet, in fact, translated it a11aud , but he lacks karma for the post, so I write (a11aud will be very grateful for karma :))

1) Introduction

My neighbors are stealing my wireless internet. Yes, I could start encrypting, but you can get a lot of pleasure from the contemplation of perplexity on their faces!

2) Share the network!

I started by dividing the network into two parts: trusted and untrusted. The trustee had its share of the network, the untrusted had its own. We use a DHCP server to identify poppy addresses for separation into appropriate groups.


/etc/dhcpd.conf

ddns-updates off;
ddns-update-style interim;
authoritative;

shared-network local {

    subnet *.*.*.* netmask 255.255.255.0 {
        range *.*.*.* *.*.*.*;
        option routers *.*.*.*;
        option subnet-mask 255.255.255.0;
        option domain-name "XXXXX";
        option domain-name-servers *.*.*.*;
        deny unknown-clients;

        host trusted1 {
            hardware ethernet *:*:*:*:*:*;
            fixed-address *.*.*.*;
        }
    }

    subnet 192.168.0.0 netmask 255.255.255.0 {
        range 192.168.0.2 192.168.0.10;
        option routers 192.168.0.1;
        option subnet-mask 255.255.255.0;
        option domain-name-servers 192.168.0.1;
        allow unknown-clients;

    }
}

* This source code was highlighted with Source Code Highlighter.

3) IPtables - it's funny!

Suddenly, everything became cats! Koshkanet.

/ sbin / iptables -A PREROUTING -s 192.168.0.0/255.255.255.0 -p tcp -j DNAT --to-destination 64.111.96.38

For the uninitiated, this redirects all traffic to kittenwar

PS I suggest http: // www .koshkimira.ru /

For added fun, you can configure iptables to forward everything to a transparent squid proxy running on port 80.

/ sbin / iptables -A PREROUTING -s 192.168.0.0/255.255.255.0 -p tcp -m tcp --dport 80 -j DNAT --to-destination 192.168.0.1 Squid is turned

on this car with a banal redirect that downloads pictures, uses a modifier to flip them upside down and extends beyond the local web server.

Actually, the script itself:

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

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

* This source code was highlighted with Source Code Highlighter.

4) And the Internet began to look like this!

And if you try the "-blur 4" vagueness effect, you will get "vague"!


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