Tuts4Tech » Linux

How to spoof your speedtest.net results

Duffy — Fri, 30 Apr 2010 11:19:53 +0000

In this tutorial we will be showing you how to spoof your speedtest.net results. You will require a httpd server to do this, in this tutorial I used lighttpd running on debian.

To install lighttpd on debian just simply run

apt-get install lighttpd php5-cgi php5-ldap php5-mhash

and edit your php.ini to change cgi.force_redirect to 0

nano /etc/php5/cgi/php.ini

Come down and you'll find ;cgi.force_redirect = 1 and change it to cgi.force_redirect = 0
Now we need to edit lighttpd.conf

nano /etc/lighttpd/lighttpd.conf

Add the following lines

fastcgi.server = ( ".php" =>
                        (
                                (
                                        "bin-path" => "/usr/bin/php-cgi",
                                        "socket" => "/tmp/php.socket",
                                        "max-procs" => 20,
                                        "bin-environment" =>
                                        (
                                                "PHP_FCGI_CHILDREN" => "2",
                                                "PHP_FCGI_MAX_REQUESTS" => "10000"
                                        ),

                                )
                        ),
                    ".phps" =>
                        (
                                (
                                        "bin-path" => "/usr/bin/php-cgi --syntax-highlight",
                                        "socket" => "/tmp/phps.socket",
                                        "max-procs" => 1,
					"check-local"       => "disable"
                                )
                        )

                 )

and then under server.modules = ( add mod_fastcgi
and then finally restart your httpd

/etc/init.d/lighttpd restart

To spoof your speedtest.net result you'll need to grab speedtest.net mini you can download this from their website at http://speedtest.net/mini.php or you can just use wget to download it straight onto your server like I did in the tutorial

wget http://files.speedtest.ookla.com/releases/mini.zip

Extract mini.zip to your html dir, by default this is /var/www

mv mini.zip /var/www;cd /var/www; unzip mini.zip

Find out the IP address of the speedtest.net server to do this just simply run a speedtest and you will see it say something like Transferring data from host
for me the host was speedtest.airwire.ie and to get the IP address we just ping the host. After finding the IP address you need to add a virtual interface on your httpd server with this IP to do so run the following, where xxx.xxx.xxx.xxx is the IP of the speedtest.net server

ifconfig eth0:0 xxx.xxx.xxx.xxx netmask 255.255.255.0

Then lastly we need to add a secondary IP address on your windows workstation so it can access the httpd server to do so go into your network connections right click on your networking interface click on properties select internet protocol version 4 and press properties click advanced and under IP addresses click add. Add an IP address that is in the same range as the speedtest.net server.

You should now be able to go to speedtest.net select the server you spoofed and get high speeds.

Understanding and Preventing Fork Bombs

Duffy — Wed, 07 Oct 2009 16:26:57 +0000

A fork bomb is just a bash function that gets called recursively. Once a fork bomb is active on a machine it may not be able to preform normally until a reboot is made, as the only solution to the fork bomb is to kill all its processes.

Bash Functions

A fork bomb is really just a bash function, below is an example of a bash function

helloworld() {
echo hello world
};

A fork bomb would be

:(){
 :|:&
};:

Now to explain.
:(){ - Creates the function
:|: - Next it call itself using recursion and pipes the output to another call of the function
& - Puts the function call in the background so child cannot die
}; - Terminate the function
: - Call (run) the function

If you would like a more human readable fork bomb it would be as follows

forkbomb(){
forkbomb | forkbomb &
}; forkbomb

Preventing Fork Bombs

We can prevent users from running fork bombs by limiting the amount of processes they are allowed to run.
We can achive this using /etc/security/limits.conf

To get started open /etc/security/limits.conf

nano /etc/security/limits.conf

In my example I want to limit the user john to 300 processes and any users in the group of students to 250 processes. For this I would put the following into my config file

john hard nproc 300
@students hard nproc 250

Please keep in mind that KDE and Gnome desktop system can lanuch many processes.

Installing freedesktop sound theme in debian

Duffy — Fri, 25 Sep 2009 21:41:45 +0000

I Recently found the 'system sound' tab in gnome-sound-property grayed out my work around to this was to install the freedesktop sound theme.

Firstly remove gnome-audio
```
sudo apt-get remove --purge gnome-audio
```

Remove all your old users gconf data related to system sounds
```
sudo rm -rf /home/*/.gconf/desktop/gnome/sound
```

Install some needed packages

sudo apt-get install libcanberra-gtk-module libcanberra-gtk0 libcanberra0 gnome-session-canberra build-essential fakeroot dpkg-dev intltool debhelper

Grab the source for freedesktop sound theme from git.debian.org

wget -O freedesktop-sound-theme.tgz 'http://git.debian.org/?p=collab-maint/freedesktop-sound-theme.git;a=snapshot;h=c6773c0c08eeaab03c466dc015d36809dff537bf;sf=tgz'

Unpack and apply some small fixes

tar xzf freedesktop-sound-theme.tgz
cd freedesktop-sound-theme/debian
sed -e 's:touch build:./configure --prefix=/usr \&\& $(MAKE) \&\& &:' rules > tmp; cp tmp rules
sed -e 's:\*:&.ogg:' freedesktop-sound-theme.install > tmp; cp tmp freedesktop-sound-theme.install
rm tmp
cd ../

Build and install the package

sudo dpkg-buildpackage -rfakeroot
cd ../
dpkg -i freedesktop-sound-theme_0.2-1_i386.deb

Invoke gnome-sound-property and configure 'system sound'

gnome-sound-property
then you can select 'system sound' tab

Finally reboot your system and you should be good to go

Setting up passworded directories on lighttpd

Duffy — Wed, 23 Sep 2009 20:01:06 +0000

Open your lighttpd.conf
```
nano /etc/lighttpd/lighttpd.conf
```

If mod_auth isn't already in your server.modules list add it e.g

    server.modules = (
    "mod_alias",
    "mod_accesslog",
    "mod_fastcgi",
    "mod_auth",
    "mod_cgi",
    "mod_expire",
    "mod_redirect"
    }

Add the two following lines to your configuration

auth.backend = "htpasswd"
auth.backend.htpasswd.userfile = "/home/lighttpd/htpasswd"

For each directory add a block something similar to be one below

auth.require = (
                "/dir-name" => (
                        "method" => "basic",
                        "realm" => "Auth message to appear",
                        "require" => "valid-user"
                )
)

for generating your htpasswd you'll need to install apache2-utils and then use htpasswd to generate it
```
apt-get install apache2-utils
htpasswd -c -m /home/lighttpd/htpasswd username
```

Reload the lighttpd config and you should be good to go
```
/etc/init.d/lighttpd reload
```

IPTables and Bashrc Aliases

RCP — Sun, 30 Aug 2009 10:59:07 +0000

We all know IPTables can be difficult. By adding the following lines to your ~/.bashrc you can simplify the tasks of blocking packets from a certian ip.

First your going to need to install IPTables:
Gentoo: emerge iptables (Must be Root to use/install iptables)
Ubuntu/Debian: sudo apt-get install iptables

Then edit your .bashrc file and add the following

alias blockedips="iptables -L"
alias blockip="iptables -I INPUT -j DROP -s "
alias unblockip="iptables -D INPUT -j DROP -s "

Reload your .bashrc by running source .bashrc and you should then be able to run the commands below

blockedips - Will Show all Blocked hosts
blockip IP-HERE - Will Block that ip
unblockip IP-HERE - Unblocks that ip